U.S. patent application number 12/302027 was filed with the patent office on 2009-12-03 for chamber of a peristaltic pump for tire pressure adjustment.
Invention is credited to Frantisek Hrabal.
Application Number | 20090294006 12/302027 |
Document ID | / |
Family ID | 38597842 |
Filed Date | 2009-12-03 |
United States Patent
Application |
20090294006 |
Kind Code |
A1 |
Hrabal; Frantisek |
December 3, 2009 |
CHAMBER OF A PERISTALTIC PUMP FOR TIRE PRESSURE ADJUSTMENT
Abstract
A chamber (1) that works as a peristaltic pump for the pressure
correction in the tire (4), which is a part of the tire (4) or of
an ancillary structure (6) placed between the rim (7) and the tire
bead (4) and is connected with the tire (4) internal space at one
end and with the external environment at the other end. The chamber
(1) is in the shape of a curved hollow channel, where at least one
enclosing wall is at least partially formed by at least a pair of
surfaces (10) coplanar with the longitudinal direction of the
chamber (1). When the tire is mounted on the rim, the pair of
surfaces (10) are pressed together thus hermetically closing the
chamber (1). When the chamber (1) is closed during rotation of the
wheel, the surfaces (10) can slightly slide on one another taking
internal wall tensions onto themselves thus decreasing the
possibility of wall damage through ripping. A method of producing
the chamber (1) is also disclosed.
Inventors: |
Hrabal; Frantisek; (Praha,
CZ) |
Correspondence
Address: |
WRB-IP LLP
1217 KING STREET
ALEXANDRIA
VA
22314
US
|
Family ID: |
38597842 |
Appl. No.: |
12/302027 |
Filed: |
May 23, 2007 |
PCT Filed: |
May 23, 2007 |
PCT NO: |
PCT/CZ07/00035 |
371 Date: |
July 16, 2009 |
Current U.S.
Class: |
152/426 ;
156/110.1 |
Current CPC
Class: |
B60C 15/06 20130101;
B60C 23/12 20130101 |
Class at
Publication: |
152/426 ;
156/110.1; 301/5.24 |
International
Class: |
B60C 23/00 20060101
B60C023/00; B29D 30/08 20060101 B29D030/08; B60C 29/02 20060101
B60C029/02 |
Foreign Application Data
Date |
Code |
Application Number |
May 23, 2006 |
CZ |
PV 2006-335 |
Claims
1. A chamber with shape memory for pressure correction in a tire,
the chamber being a part of the tire or adjacent to a tire wall and
being connected with an interior of the tire on one end of the
chamber and with an external environment on another end of the
chamber, the chamber having a shape of a curved hollow channel, the
chamber having at least one enclosing wall formed at least
partially by a pair of surfaces that form an angle .alpha.=0 to
120.degree. with each other.
2. The chamber according to claim 1, wherein the chamber is at
least partially ring-shaped, or at least partially
helix-shaped.
3. The chamber according to claim 1, wherein the chamber is placed
in an area of a side wall of the tire at its bead.
4. The chamber according to claim 1, wherein the chamber is placed
in an ancillary structure inserted between a side wall of the tire
and at least one of a rim, a hubcap, or a support connected to the
rim or hubcap.
5. The chamber according to claim 4, wherein the ancillary
structure with the chamber is connected to the rim or hubcap or
tire side wall.
6. The chamber according to claim 4, wherein the shape of the
ancillary structure with the chamber is adapted for a connection to
the side wall of the tire from one side and the shape of the
ancillary structure is adapted for a connection to a rim from
another side.
7. The chamber according to claim 1, wherein the chamber is
terminated by a member at least at one end.
8. The chamber according to claim 1, wherein the chamber is
interconnected with at least one of a tire, a rim, a support, or a
hubcap.
9. A chamber manufacturing process for providing a chamber in a
tire, the chamber having shape memory for pressure correction in
the tire, the chamber being a part of the tire or adjacent to a
tire wall and being connected with an interior of the tire on one
end of the chamber and with an external environment on another end
of the chamber, wherein the chamber has a shape of a curved hollow
channel, the chamber having at least one enclosing wall formed at
least partially by a pair of surfaces that form an angle .alpha.=0
to 120.degree. with each other, comprising placing a matrix with a
width of 0.1 mm to 200 mm and thickness of 0.01 to 100 mm between
layers forming a side wall of the tire or an ancillary structure,
performing vulcanization, and extracting the inserted matrix as a
whole or at length corresponding to the length of the chamber,
whole or in parts.
10. The manufacturing method according to claim 9, wherein a
thickness of the matrix changes at least in part of a width of the
matrix in a direction of a center axis of the matrix.
11. The manufacturing method according to the claim 9, wherein the
matrix is extracted and a member with a cross-section at least at
one point identical with a cross-section of the chamber at a place
of location of the member in the chamber is inserted into a formed
slot.
12. The manufacturing method according to claim 9, wherein the
matrix is divided into at least two parts, the first part
corresponding to a length of the chamber and being extracted after
vulcanization and a supplementary part of the matrix remaining in
the tire or in the ancillary structure.
13. The manufacturing method according to claim 11, wherein the
member is at least at one end fitted with a channel that opens at a
face of the another end of the chamber and then leads into the
external environment.
14. The manufacturing method according to claim 9, wherein at least
a part of the chamber is pressed, extruded, ground out, milled out,
machined, cut out, melted off, or burned out.
15. The manufacturing method according to claim 9 wherein a hose
containing the chamber is inserted into the slot and/or it is
fitted with a solid section with the hose cross-section with a
smaller area than the area of the cross-section of the unloaded
chamber.
16. The manufacturing method according to claim 9, wherein forces
applied on at least a part of the chamber wall are generally of
perpendicular direction.
17. A tire having a chamber, the chamber having shape memory for
pressure correction in the tire, the chamber being adjacent to a
tire wall and being connected with an interior of the tire on one
end of the chamber and with an external environment on another end
of the chamber, wherein the chamber has a shape of a curved hollow
channel, the chamber having at least one enclosing wall formed at
least partially by a pair of surfaces that form an angle .alpha.=0
to 120.degree. with each other, wherein the wall is fitted with a
profile for ancillary structure including the chamber to fit.
18. A wheel rim for a tire having a chamber, the chamber having
shape memory for pressure correction in the tire, the chamber being
connected with an interior of the tire on one end of the chamber
and with an external environment on another end of the chamber,
wherein the chamber has a shape of a curved hollow channel, the
chamber having at least one enclosing wall formed at least
partially by a pair of surfaces that form an angle .alpha.=0 to
120.degree. with each other, wherein at least one wall of the rim
is fitted with a profile for ancillary structure including the
chamber to fit.
19. The chamber according to claim 1, wherein the angle
.alpha.>0.degree. and the chamber is at a connecting edge of the
surfaces.
Description
TECHNICAL FIELD
[0001] The invention regards a chamber with shape memory for tire
pressure adjustment, which is a part of the tire or is adjacent to
the tire wall and connected with the tire internal space at one end
and with the exterior environment at the other end. It also
concerns the production method of the chamber and tire and rim with
this chamber.
BACKGROUND ART
[0002] Different solutions for pressure maintenance in the tire
under operation are used in technical practice. These are for
example tires fitted with an air intake, connected to an external
source of pressurized air. The draw back of these solutions are
high costs and complexity of the devices.
[0003] There are also self-inflating tires. For example, the model
type of a self-inflating tire is described in pending patents CZ PV
2002-1364 and CZ PV 2001-4451. The air feed chamber is located in
the tire wall or adjacent to it. The chamber is periodically
completely compressed or broken, with progressive rolling
deformation across the tire chamber, the advancing compression of
the chamber to the zero cross-section area forces the medium
contained in the chamber forward, thus creating vacuum behind. The
chamber in the shape of a hose placed in the tire wall or in its
vicinity along the tire perimeter works as a peristaltic pump.
[0004] During tire manufacture, the individual layers of various
components are applied in the form of flat material onto the
revolving building drum. Components are then expanded and shaped by
pressure applied from the interior side to a ring-shaped
arrangement.
[0005] The pressure is usually provided and directed by a blader
described for instance in CZ patent 246152, defining the center
blader of the building drum for tire building and use of such
bladers.
[0006] Following the pressure forming, the raw rubber tire is
removed from the building drum and inserted into the forming and
vulcanizing mould in the shape of the finished tire. The mould is
sealed and heated. The raw rubber tire is radially expanded in the
outward direction up to the mould perimeter, through injection of
the power fluid into the hardening blader mounted inside the mould
and placed inside the mould. The hardening blader expands, it
pushes the tread and the side walls of the raw tire into the mould
heated walls. Upon this vulcanization, the individual layers are
joined together and the tire gets its final shape and hardness.
[0007] The tire re-treading is performed in a similar way.
[0008] The blader function is for example described in CZ patent
273325 "Mobile unit for vulcanization of tire-casings" where the
unit consists of two-piece mould, halves of which can be joined to
form a ring-shaped chamber for holding the non-vulcanized casing.
One of both halves of the mould contains a closed circuit for the
pressure vulcanization medium. The closed circuit includes the
interior of the blader, which is squeezed into the ring-shaped
chamber, and housing connected to the heated feeding channels and
return channels. The blader is made of elastomer, it is of the
C-shape and expands inside the ring-shaped chamber, thus pressing
on the inner surface of the non-vulcanized raw casing.
[0009] The CZ patent 246152 defines the center blader of the
building drum of the machine for tire casing building and use of
such bladers, which serve as curing membranes for most building
drum types. They have the role of an active element in reshaping
the originally manufactured drum-shaped tire casing semi-finished
product to the torus shape.
[0010] To clarify some of the new production methods of tire
chamber-type, it is necessary to mention the design of the tubeless
tire and rim assembly and the behavior of this assembly in
operation. In general, the tubeless tire has the C-shape. After the
tire is fitted onto the rim and inflated, the tire walls expand in
the direction of the rotation axis and in the bead area they press
against the rim walls, which makes the inflated tire seal. The
hermetically closed assembly then consists of the tire side walls,
the tire tread part, and the rim.
[0011] Disadvantages of these designs are high production costs,
worse operation and mounting of the chamber and the related
components into the wheel assembly, very high risk of breakage,
crumbling and abrasion of the chamber walls in their compressing,
and thus shortened chamber life expectancy as well as the tire
safety. In case of forces applied on the chamber against the
direction of the chamber closing, which can be quite common during
the chamber function, its wall can be ripped. Another disadvantage
is difficult or unsolved joining of the individual chamber
components; then the need for fundamental modifications in the tire
chamber-type manufacturing method, and especially the fundamental
modifications of the production machinery. Yet another disadvantage
is the need of production basically complete unique chamber
assembly for each tire type and pressure. And finally, with respect
to a relatively small space, which is available for the chamber
installation, the chamber will have a relatively small working
volume and output.
DISCLOSURE OF THE INVENTION
[0012] The above mentioned draw backs are significantly eliminated
by the use of the chamber with shape memory for the tire pressure
correction in the tire, which is a part of the tire or is adjacent
to the tire wall and is connected with the inside space of the tire
at one end and with the outer environment at the other end,
according to this invention. The core of this invention is that the
chamber has the shape of the curved hollow channel, where at least
one its enclosing wall is formed by at least a part of the pair of
surfaces coplanar with the longitudinal direction of the chamber
and at the angle .alpha.=0 to 120.degree.. If the angle is
.alpha.>0.degree. it is on the connecting edge of these
surfaces, located on the remote side from the center of the
transverse chamber cross-section.
[0013] The chamber has an advantage of being at least partly
ring-shaped, or at least partly torus, or at least partly helix.
The chamber can be located in the space of the tire sidewall, at
its bead; or it can be located in the ancillary structure inserted
between the tire sidewall and at least one component of the
assembly consisting of the rim, hub-cap, or support. In the
efficient design, the ancillary structure with chamber is firmly
connected to the rim or hub-cap, or with the tire sidewall. The
ancillary structure containing the chamber is efficiently shaped
for tight fitting with the tire sidewall from one side and shaped
for fitting with the rim from the other side.
[0014] Then the invention regards the production method of the
above stated chamber. In this method, a usually flat matrix is
inserted between the layers forming the tire sidewall before
vulcanization, with the width of 0.1 to 200 mm and thickness of
0.01 to 100 mm. Then vulcanization is performed and the inserted
matrix is removed in one piece, or in parts. In the efficient
design, the matrix thickness is increased in the direction from the
center axis.
[0015] After vulcanization, the matrix is removed and a member with
the cross-section identical to the chamber cross-section at the
place of location of the member inside the chamber is inserted into
the formed slot with the U-shaped cross-section opening towards the
center axis. After fitting the tire onto the rim, all the chamber
wall surfaces will take the working position and the slot walls
will touch each other in their respective parts and the chamber
cross-section will correspond to the required chamber cross-section
before loading. In the effective design the member is, at least at
one end, fitted with a channel, which opens at the face of the
chamber and leads into the free space outside the tire, or outside
the ancillary structure.
[0016] The matrix is effectively divided into at least two parts,
where the first part corresponds with the chamber length and is
removed after vulcanization. The second (additional) part of the
matrix remains in the tire, while an incompressible channel is
effectively formed in the additional part at least at one end, and
this leads to one of the faces of the chamber ends and its other
side leads into the empty space inside the tire or outside the
tire.
[0017] The chamber can be effectively formed also by the matrix
circumscribing only a part of the circle of the tire or ancillary
structure.
[0018] The ancillary structure with the chamber, or the chamber in
the tire wall, respectively can be formed by sticking of two strips
of material together, where at least in one of the strips at least
a part of the chamber will be pressed out, ground out, milled out,
machined, cut out, melted off, or burned out. The chamber in the
ancillary structure formed in only one strip of material or the
tire wall, respectively can also be made by pressing out, grinding
out, milling out, machining, cutting out, melting off, or burning
out, or the whole ancillary structure can be extruded in a similar
way to producing sealing, hoses, etc.
[0019] The invention also concerns the tire or rim with a wall that
is fitted with a profile for the fitting with of the ancillary
structure.
[0020] The advantage of the chamber is that the chamber walls,
formed by the pair of surfaces under a small angle, are subjected
to relatively small forces upon the chamber deformation. This
decreases the possibility of wall damage, for example through
ripping or breaking as a result of internal tension under load.
[0021] The pair of surfaces can continue outside the chamber under
the angle of 0 degrees. These surfaces, pressed together, take the
internal wall tension onto themselves in a smaller extent. If the
wall was not formed by partly parallel surfaces a higher mutual
transmission of forces would occur. On the other hand, with
parallel surfaces, the internal forces within the chamber wall will
be much simplex and less interacting.
[0022] The walls diverge or open towards the inside of the chamber.
If there is a temporary need for the surfaces to open in a further
distance from the chamber cross-section center upon the chamber
deformation, the point of opening can move to the place of the
original parallel surfaces. However, if the surfaces were firmly
joined in the original place of opening and they did not continue
in parallel outside the chamber, a ripping could occur in this
point. The option of moving the point of opening thus provides
lower strength stress of the chamber walls during different loading
of the tire and chamber.
[0023] The opposite chamber walls can have a different
cross-section length. Nonetheless, it is necessary that they
hermetically fit on each other under the load and their
cross-section lengths were sized up at the same time. This can be
achieved by transverse compression of the wall with a longer
cross-section, or by transverse stretching the wall with a shorter
cross-section, respectively. Compression or stretching of the walls
is limited by their compressibility, or expandability of the wall
material. However, if the wall with a longer cross-section is
formed by two surfaces making an angle of 0 to 120 degrees and the
vertex of the angle will be located, for example, in the center of
the cross-section of this wall then this wall will change its
cross-section length easier when subjected to load. Since the place
of the chamber location as well as material qualities are limited
this folded arrangement will allow maximization of the chamber
volume also in the given limited conditions, even in the limited
space.
[0024] The chamber walls with different lengths will have a
tendency to shift over each other when under the load. The folded
arrangement will reduce this tendency, the chamber will fold to its
final closed shape under the load and the opposite walls will
become almost parallel just before their mutual contact. Under this
arrangement at the same time, the chamber walls are subjected to
forces generally perpendicular to the chamber walls. Thus, their
orientation closes the chamber, which is the required state, and
also does not act in parallel with the chamber wall in such a great
extent, which would be an undesirable state, because the walls
would shift over each other. The sliding of the walls on each other
causes their abrasion and destruction, which can lead to the
tightness failure or the increase in volume of a part of the
chamber, and thus to the change in the output pressure. With a
regular passenger vehicle tire, there are about 500 revolutions per
kilometer, or 5 million revolutions per every 10 thousand
kilometers. This is why it is necessary to minimize any causes of a
possible defect.
[0025] The chamber is effectively at least partly ring-shaped or
torus-shaped, or at least partly helix-shaped because these shapes
can be easily manufactured and help to achieve the required
effects. The chamber is effectively placed in the area of the tire
side wall at its bead because here is enough room for its
placement. The chamber can be easily connected to the air inlet and
outlet and all the chamber parts, including the valve, are close to
the rim where they are subjected to the lowest centrifugal forces
within the tire and thus it is easier to balance the tire. The bead
area is one of the most rigid places in the tire and therefore the
tire here behaves very predictably over the rotation cycle and it
has the lowest deviations from the set point and expected state and
it is one of the most protected places from wear and tear in the
tire here.
[0026] The chamber can be placed in the ancillary structure, which
is inserted between the tire side wall of the and at least one part
from the following: the rim, hubcap, or support. This design allows
the use of the regular contemporary tire and the overall
contemporary wheel design; it is also possible to fasten the
ancillary structure together with the rim or hubcap or tire side
wall, which reduces the danger of its shifting or loss.
[0027] The matrix used to create the chamber can be pulled out of
the chamber using the parallel surfaces of the chamber wall. If the
surfaces continue through the tire wall out of the tire, as well as
the matrix between them, it is possible to pull out the matrix
between them out of the space formed by the matrix. For easier
matrix extraction, these surfaces may be pulled apart temporarily.
After fitting the tire onto the rim, all the chamber wall surfaces
will take up a functional position and the chamber cross-section
will correspond to the desired chamber cross-section before
applying a load. The forces commonly present between the tire and
the rim are therefore effectively used to ensure the required shape
of the chamber and to seal all the sealing surfaces.
[0028] Even in the case when the chamber wall surfaces continue in
parallel outside the chamber, though not outside the tire, or in
the case that a thin and bendable, or flexible, matrix is used the
extraction of the matrix after the vulcanization will be easier. By
applying pressure on the chamber in parallel with the extension of
chamber walls, or by applying pull on the chamber walls across the
chamber walls, the chamber walls will get apart from each other in
the direction of the pull and will not adjoin to most of the outer
matrix surface. Thus they will not create considerable resistance
against the extraction of the matrix out of the chamber lengthwise.
However, the condition is that the matrix ripples or bends in its
part creating the foot print of the parallel surfaces and thus
allows the chamber to get contracted in this direction.
[0029] Effectively, the matrix can be bendable, e.g. rubber coated,
fabric. Such material is bendable, but just a little compressible,
which ensures the required shape of the foot print of the matrix.
The bendable matrix can then be very easily extractible since it
shrugs and avoids obstructions on its own when being extracted.
[0030] In the tire manufacture, the parallel surfaces enable the
production of the chamber by a simple design change of the
vulcanizing mould, commonly used in tire production. The chamber
production matrix is attached to the vulcanizing mould and the
matrix is then removed along with the vulcanization mold after the
vulcanization of the tire. It is a relatively inexpensive and
technically simple change, which will ensure the creation of a
full-fledged chamber after fitting the tire on the rim. The chamber
production matrix can also be inserted between the tire layers
separately, before the tire is inserted into the vulcanizing mould
and removed after the tire is taken out of the mould. The matrix
can also be placed on the tire layers and subsequently covered by a
layer of material and then vulcanized.
[0031] The chamber created between the tire and rim, or support
mounted on the rim, takes the full advantage of the force arising
between the tire and rim upon the tire deformation. In order to
utilize the forces, which act these days in the tire wall above the
bead in the point where the tire is not touching the rim any more,
but is coming close to it periodically, it is possible to create a
lug boss on the tire wall, which will fill up this room and uses
the forces caused by the tire coming close to the rim to close the
within contained chamber. If this lug boss is produced together
with the tire it is again a simple change in design. The lug boss
can also be replaced by an ancillary structure inserted between the
tire and the rim.
[0032] Moreover, the lug boss or ancillary structure can increase
the rigidity of the tire side wall, which is positive. Efficiently,
it can be created at both beads of the tire, even if only one of
them will contain the functional chamber in. Such placement at both
beads will ensure the bilaterally symmetrical rigidity of the
tire.
[0033] The tire walls are subjected to significant heat stress; the
tire bead ambiance is among the exposed places. Periodical airflow
inside the chamber will ensure increase in heat dissipation off the
tire wall.
[0034] Since a flat matrix with a width of 0.1 to 200 mm and
thickness of 0.01 to 100 mm and efficiently fitted with a shaped
protrusion will be inserted between the layers comprising the side
wall of the tire or ancillary structure before vulcanization, the
matrix can be easily removed after vulcanization, while the
required profile will remain impressed in the material. The matrix
can be extracted in parts, which makes its extraction easier, or as
a whole, where it is possible to use the matrix repeatedly without
the need to realign its individual parts every time. The extraction
of the matrix can go easier even if the matrix thickness is
changing offward the center axis.
[0035] If the wall of the tire and rim is equipped with a profile
for fitting tight of the ancillary structure already in their
production then the placement of this ancillary structure will be
correct and fixed.
[0036] The chamber made in this way--if placed at the bead part
near the rim--allows the connection with the more robust parts
interconnecting the chamber with the tire and exterior environment.
For example, the use of a larger valve allows its higher fineness
and/or fitting of the valve with more features such as mechanical
or electronic communication with other devices, status indication
to the driver, air relief from the tire, and so on. The valve can
be mounted directly onto the rim and thus it will not directly
burden the structure of the tire. The closer the whole structure is
to the wheel axis, the more massive it can be, and the less it will
burden the wheel by its centrifugal forces. The interconnection of
the chamber with its other parts created between the rim and the
tire or ancillary structure, or partial creation of a part of the
chamber within the tire or ancillary structure and the rest of the
chamber, e.g. in the rim or between the rim and the tire, allows
simple interconnection of these parts and their sealing by fitting
the tire on the rim and the pressure between the tire and the rim.
The formation of the incompressible channels allows to create not
only the interconnection of the individual parts of the chamber but
directly the incompressible channels can make a part of the chamber
non-deformable to zero cross-section area of the chamber. Creating
of a part of the chamber within the tire or ancillary structure and
another part of the chamber outside them allows to form the chamber
in a modular way, where the individual elements are standardized
and usable e.g. for different tire sizes. In this way, it is, for
example, possible to form a chamber within the tire with an exactly
defined interior volume of the chamber and to define the resulting
inflating pressure of the chamber by the volume of the
non-deformable channels formed within the rim, with their volume
corresponding to the inflating pressure required for the particular
vehicle using these rims. The chamber can then be formed
universally for different tire sizes and different inflating
pressures while it is fine-tuned using suitable follow-up parts of
the chamber for specific requirements.
[0037] Approximately a half of the vehicles on the roads have at
least one tire underinflated by more than 20 percent, which is
considered as highly risky. An underinflated tire can keep track
worse and overheats, which leads to its rapid wear and tear, and
thus to the loss of grip, or even to its explosion. Besides these
safety risks, the economic side is important too. An underinflated
tire has shorter operating life and higher rolling resistance,
which shows by increased fuel consumption of the vehicle. Since
drivers generally tend to overlook this risk and do not deal with
it, self-inflation will have great safety and economic impacts.
[0038] In order to give a general idea of the function of the
self-inflating tire chamber not only under this patent, a
description of the general fundamental principles of its function
will follow. A longitudinal chamber, e.g. of a rectangular
cross-section of 1 times 3 millimeters, is formed in the tire o.
The tire gets compressed at the contact point of the tread and road
and this deformation spreads through the tire approx. towards the
tire axis up to the bead or to the rim, respectively. The chamber
is formed diagonally to this deformation and therefore the
deformation closes the chamber diagonally and the cross section of
the closed chamber is 0times 3 millimeters. The chamber has a zero
cross-section area of the chamber at the point of the diagonal
closing; it is blind. While the tire is rolling along the road
surface the point of deformation moves along the tire circumference
and the point of the diagonal closing of the chamber moves as well
gradually and pushes the air compressed in the chamber ahead, while
a vacuum is formed behind the deformation point within the
chamber.
[0039] Based on the above mentioned principle, there are several
alternatives of the chamber, which vary in the number and type of
the valves used and the method of controlling the output or the
maximum pressure of the chamber. For example, in the chamber using
at least one valve the output pressure or the maximum pressure can
be set by creating a chamber with a fully deformable part and fully
non-deformable part, where both of these parts have defined maximum
and minimum internal volume. The output pressure or the maximum
pressure in the chamber is then defined by the ratio of the maximum
volume of the chamber parts at the start of the cycle to the
minimum internal volume at the end of the cycle.
[0040] Different tires have different dimensions. Just for
illustration, a common tire size R13 has the contact area of its
bottom part and rim about 12 mm wide and the contact area of its
side part and rim about 7 mm high. Such a common tire for a
passenger vehicle can get closer to the rim with its side wall at
the upper part of its rim wall by tenths of millimeter and on the
outer side of the tire above the contact area of a contemporary
tire and rim in the matter of millimeters when rolling off. These
dimensions then define the size of the unloaded chamber created at
the tire bead in the matter of tenths of millimeters to
millimeters. If the design of the common tire was changed it would
be possible to increase this span.
[0041] For tires for trucks and special machinery these spans can
then be reasonably higher depending on the size and design of these
tires.
BRIEF DESCRIPTION OF DRAWINGS
[0042] The chamber with shape memory for tire pressure correction
according to this invention will be described in detail using
particular examples of design with the help of drawings
attached.
[0043] FIG. 1.a) shows the sectional view of the tire and FIG. 1.b)
shows in the front view.
[0044] FIGS. 2.a) through 2.d) show the detail of the chamber
arrangement.
[0045] FIGS. 3.a) through 3.i) show different types of chamber
cross-sections in the sectional view and their process of
manufacture.
[0046] FIGS. 4.a) through 4.d) show the procedure of the matrix
extraction, where FIGS. 4.a) and 4.b) show the section through the
tire and FIGS. 4.c) and 4.d) show the tire in the front view.
[0047] FIG. 5.a) shows the member. FIGS. 5.b) through 5.f) show the
cut of the tire with inserted member and
[0048] FIGS. 6.a) through 6.e) show different shapes of the
cross-section of the chamber and matrix in their manufacture and
the function of the chamber.
[0049] FIG. 7.a) shows the detail of the chamber and
interconnection of its parts outside the tire.
[0050] FIG. 8.a) shows the detail of the arrangement of the member
and support between the tire and rim.
EXAMPLES OF THE DESIGN OF THE INVENTION
[0051] For illustration, the invention is described on the
individual examples of its design.
Example 1
[0052] The chamber 1 with shape memory for pressure correction in
the tire, which is a part of the tire or adjacent to the tire wall
and is connected with the internal space of the tire at one end and
with the exterior environment at the other end, has the shape of a
curved hollow channel, with its enclosing wall partly formed by the
pair of surfaces 10 lengthwise coplanar with the chamber 1
(channel) under the angle of .alpha.=2 to 15.degree.. The angle
.alpha.>0.degree. is on the contacting edge of these surfaces 10
located on the further side from the center of the chamber 1
cross-section. The chamber 1 is placed in the area of the tire side
wall 4 at its bead.
[0053] When manufacturing the chamber 1 a flat matrix 9 with a
shaped protrusion and with a width of 0.8 mm and thickness of 0.02
mm, is inserted between the layers forming the tire side wall 4
before vulcanization, then the vulcanization is performed and the
inserted matrix 9 is extracted as a whole towards the center axis 2
of the tire 4. The thickness of the matrix 9 refers to the
measurement roughly perpendicular to the width of the matrix 9. The
width of the matrix 9 impressed in the ancillary structure 6 as
shown on the FIG. 3. g) is then the entire length of the matrix 9
along the arrow and the thickness is measured roughly across the
matrix 9 arrow. The member 19 with the cross-section identical to
the chamber 1 cross-section is inserted into the formed slot with
the generally U-shaped cross-section, opening towards the center
axis of the tire 4. The member 19 is fitted with the channel 913 at
one end, which opens at the face 12 of the end of the chamber 1 and
leads to the internal space of the tire 4; another member 19 opens
at the opposite face 12 of the opposite end of the chamber 1 and
leads to the external environment outside the tire 4. The matrix 9
can also be extracted in a different direction than towards the
axis of tire 4, e.g. offward the axis of the tire 4 or in parallel
with the axis of the tire 4. The condition is that the formed slot
or extended surfaces 10, respectively, through which the matrix 9
is being extracted were created in the direction, in which, after
fitting the tire 4 on the rim 7, sufficient forces are present to
seal them hermetically, as shown on FIG. 3.h), where this is shown
at the ancillary structure 6.
[0054] The FIG. 3.h) shows the circular chamber 1 created in the
ancillary structure 6, while the extended surfaces 10 are led out
through the wall of the ancillary structure 6 towards the free
space outside the tire 4 and rim 7. The surfaces 10 are
hermetically pressed together by pressure between the tire 4 and
rim 7. Accordingly, it is possible to create the chamber 1 with the
extended surfaces 10 in the tire 4 side wall. It is also possible
to lead out the extended surfaces 10 through the wall of the
ancillary structure 6 towards the tire 4 wall. Generally, it is
then possible to lead the surfaces 10 out of the ancillary
structure 6, and/or tire 4, towards any outside wall of the
ancillary structure 6, or of the tire 4, respectively. The only
condition is that they are placed at the extended surfaces 10 to
the point sufficient pressure, which will ensure their hermetical
sealing.
[0055] In general, the chamber 1 can contain a part deformable to
zero cross-section area of the chamber 1. A part non-deformable to
zero cross-section area of the chamber 1 can be added. The examples
describe mainly the deformable part of the chamber 1, nonetheless
the part of the chamber which is not deformable to zero chamber
cross-section area can be created in a similar way, too. To make it
clear, any part of the chamber 1, which may be concerned, is
referred to as the chamber 1 in this application. Although the
chamber 1 in the examples is placed mainly to the tire 4 bead, it
can also be created--while keeping the considerable portion of the
design advantages--anywhere else in the wall or at the wall of the
tire 4, so, for example, even at the tread of the tire 4.
[0056] FIG. 1.a) shows the cut through an unloaded tire 4 and rim
7. The circle indicates the place used for placement of the chamber
1 detail on the other figures, while FIG. 2.a) depicts an enlarged
detail of this circle.
[0057] On FIG. 2.b), the ancillary structure 6 is placed between
the unloaded tire 4 and rim 7. The cross-section of the tire 4 wall
matches the shape of this structure 6 from one side and from the
other, it matches to the cross-section of the rim 7. It holds at
the required location due to the pressure of the tire 4 onto the
rim 7, or it can be fixed to the rim 7 or tire 4.
[0058] FIG. 2.d) shows the tire 4 side wall under load. The tire 4
affects the ancillary structure 6 by its wall and compresses it
against the rim 7. Within contained chamber 1 will be compressed
along with the ancillary structure 6. The direction of deformation
is indicated by the broken arrow.
[0059] The chamber 1 can be created in the ancillary structure 6 or
directly in the tire 4 wall, namely either between the layers of
the commonly produced tire 4, or if there is not enough space in
the tire 4 wall, it can be created in the lug boss on the tire 4
wall, which is analogous to the ancillary structure 6. Such a lug
boss on tire 4 wall is shown on FIG. 2. c) and as for a
cross-section, it corresponds with the ancillary structure 6 on
FIG. 2. c) in this case. Under load, the lug boss will get deformed
accordingly with the ancillary structure 6 on FIG. 2. d).
[0060] The tire 4 is being periodically compressed when driving,
while its bead is being pressed onto the rim 7 in the bead area and
the wall of the tire 4 is getting closer to the rim 7 periodically
above the bead area. This forcing and approaching ensures the
transverse closure of the chamber 1 placed at the tire 4 bead or
above it. Lengthwise, the chamber 1 can have a shape of incomplete
annulus and can veer from the annulus-like shape towards the axis
of the tire 4 as well as in parallel with the axis; the only
condition for transverse closure is that the chamber 1 was located
at the point of sufficient force for closing the chamber 1. Such a
point can be found e.g. between the tire 4 and rim 7. A part of the
chamber 1, or the whole chamber 1 can be circular, elliptic,
linear, spiral, or helix, or in the shape of another curve, or the
center of the cross-section area of the chamber 1 or its part can
be placed on these curves.
Example 2
[0061] FIG. 3. a) shows the ancillary structure 6 containing the
chamber 1 with the cross-section in the shape of a three-pointed
star. This part of the chamber 1 is placed on the outside side wall
of the tire 4 above the tire 4 bead and the rim 7. The tire 4 is
not shown here and the chamber 1 is shown in an unloaded condition.
There is a sharp angle .alpha. on the surfaces 10 comprising the
wall of one of the points. The sharp angle will ensure the
hermetical sealing of the walls forming the chamber 1 upon
deformation of the chamber 1, while there is minimum bending and
tension in the walls, which reduces the overall tension and
material stress in the chamber 1 walls. The FIG. 3. b) shows a
cross-section through the chamber 1 under load, the walls of the
chamber 1 adjoin each other in the loaded point, the chamber 1 is
blind and has the zero cross-section area of the chamber 1 in this
point. The direction of deformation caused by load is indicated by
a broken arrow.
[0062] The chamber 1 with sharp angles on the sides of surfaces
further from the center of the chamber 1 cross-section area shown
here can be created at any place of the tire 4 wall or in its
vicinity, for example also in the tread or side wall of the tire 4.
The reason why the concept "the center of cross-section area of the
chamber 1" is used is that the cross-section area of the chamber 1
needs not to be a definable geometrical center or point of
symmetry. So it is an approximate center of this area.
[0063] FIG. 3. c) shows the ancillary structure 6 containing the
chamber 1 in the shape of three-pointed star. The chamber 1 has the
same profile as the chamber 1 on FIG. 3. a). However, the surfaces
10 of the chamber 1 walls are extended beyond the point of sharp
angle shown on FIG. 3. a) and continue in parallel to each other,
it means under zero angle, deeper into the chamber 1 wall. Due to
this extension, indicated by P, the walls of the chamber 1 are
physically separated from each other, and these extended surfaces
10 s reduce the forces, caused by deformation, transferred between
the chamber 1 walls. In this example, the extension is shown for
all points of the three-pointed-star shaped chamber 1 even though
it is indicated by P only at one of its points.
[0064] Upon deformation of the tire 4, forces are absorbed by this
separation of surfaces that could otherwise damage the walls of the
chamber 1 if the surfaces were not separated. Such a chamber 1 with
extended surfaces 10 can be created at any place in the wall of the
tire 4 or in its vicinity, so for example, in the tread or side
wall of the tire 4, too.
[0065] The chamber 1 is located at the point with variable
deformation forces. When these forces act temporarily against the
forces closing the chamber 1 during the cycle, the extension of the
surface 10 of the chamber 1 walls will allow a wider opening of the
chamber 1 walls temporarily and the touch point of the chamber 1
walls will move towards the extension in this case. If there was no
extension of the surfaces 10, the wall of the chamber 1 could be
torn in the point of sharp angle shown on FIG. 3. a).
Example 3
[0066] The chamber 1 can be manufactured by pressing in the matrix
9 between the walls of the chamber 1 and subsequent extraction of
the matrix 9. The extension of the surfaces 10 outside the chamber
1 itself under the zero angle between the surfaces 10 then allows
simple extraction of the matrix 9 in the manufacture of the chamber
1.
[0067] FIG. 3. d) shows the manufacture of the chamber 1 with a
circular profile. The partly circular matrix 9 is impressed in the
material of future chamber 1 walls; it is then extended outside the
circular cross-section of the chamber 1 and led out of the
ancillary structure 6. After pressing out, this extension will make
parallel surfaces 10 passing through the chamber wall up to the
point outside of the ancillary structure 6. Thus it will create a
passage for extraction of the impressed matrix 9. Extraction of the
matrix 9 is shown on FIG. 3 e).
[0068] After fitting the ancillary structure 6 and tire 4 onto the
rim 7, these extended surfaces 10 will press together tight and the
chamber 1 cross-section will take on the required cross-section
shape of the unloaded chamber 1. This sealing and taking the
desired cross-section of the chamber 1 is shown on FIG. 3.f).
Accordingly, the chamber 1 can be created in the wall of the tire
4, too.
[0069] If the matrix 9 is at least partly made of bendable or
flexible material, e.g. vulcanized-rubber-coated fabric or thin
steel sheet, it will contract or bend upon extraction and will not
present any significant resistance. The extraction of the matrix 9
can be made easier by using a separator, which is applied on the
matrix 9 walls before vulcanization. This separator ensures that
the matrix 9 will not adhere to the chamber 1 walls upon
vulcanization.
[0070] FIG. 3. g) shows partial extraction of the arrow-shaped
matrix 9. Not even the walls of the ancillary structure 6 present
any significant resistance due to their flexibility. Extraction of
the matrix 9 can be made easier by temporary opening of the
profile, created by the matrix 9 in the ancillary structure 6,
using a suitable tool. The matrix 9 can also be divided into more
parts and extract them piece by piece. This will make the
extraction easier mainly in case of using a solid matrix 9.
[0071] FIG. 4. a) shows the tire 4 with an impressed bendable
matrix 9 in section; FIG. 4.c) shows this in a side view. In the
side view, the wall of the tire 4 overlaining the matrix 9 is shown
as partly transparent. FIGS. 4.b) and 4.d) show partial extraction
of the matrix 9 in its upper part, while the side and bottom parts
of the matrix 9 are not extracted yet. Upon extraction, the matrix
9 has crouched and bent and thus created a space for extraction of
the remaining matrix 9.
[0072] FIG. 3. i) shows other efficient designs of the chamber 1
profile in the shape of two types of lenses. Then it shows a folded
and diamond-shaped type of the chamber 1 profile. The efficient
design of the chamber 1 shape is chamber 1 with the walls as
perpendicular as possible to the forces acting on the walls of the
chamber 1. This prevents mutual shifting of the opposing walls of
the chamber 1 over each other and their abrasion and
destruction.
[0073] The walls of the tire 4 or the ancillary structure 6 can by
provided with rubber industry reinforcing and strengthening
elements such as fabric cord, wire, impact ply, reinforce strip, or
bandage.
[0074] Rubber making the body of the tire 4 can have relatively
high permeability for air entrapped in the tire 4. For this reason,
a layer of so called internal rubber, that ensures impermeability
of the tire 4, is used for its innermost layer. Accordingly,
internal rubber can be used for walls of the chamber 1. In the
manufacture of the chamber 1, internal rubber can be used directly
for the production of the tire 4 layers or for the ancillary
structure 6, between which the matrix 9 is being placed when the
chamber 1 is produced, or a layer of internal rubber can be put on
the matrix 9 before its insertion between the layers of the
produced tire 4 or ancillary structure 6. Upon the subsequent
vulcanization, the internal rubber merges with the adjacent layer
of material.
[0075] The chamber 1 can also be made by cutting operation, cutting
with a thermal knife, melting off, or burning out within the wall
of the tire 4 or ancillary structure 6. It is also possible to
create the chamber 1 by spewing, in a similar way as rubber hoses
or seals are produced.
[0076] Either a hollow hose to contain the chamber 1 can be put
into the slot formed by the matrix 9 or by the above mentioned
method, or a solid hose that will make the final space of the
chamber 1 by its outer walls and walls formed by the matrix 9 or in
other above-mentioned way. The hollow hose can be made of more
elastic material than the walls of the slot and it will then better
close and seal the chamber 1 under load. It can also be made of
impermeable rubber and substitute the need for adding internal
rubber into walls of the chamber 1 upon its vulcanization.
Accordingly, the solid, i.e. not hollow hose can effectively be
made of more elastic material than the walls of the slot and it
will better diagonally close and seal the chamber 1 under load,
while it will leave transition space in the chamber 1, between its
external walls and walls formed by the matrix 9 or in other
above-mentioned way, when not under load.
Example 4
[0077] The rims 7 are standardized, nonetheless their parts,
profiles of which are supposed to correspond to the wall of the
ancillary structure 6 or the wall of the tire 4 containing the
chamber 1, can vary from type to type of the rim 7. This can be
treated by standardizing the relevant part of the rim 7, or by
making a support 15 fixed to the rim 7 or to the hubcap or between
the rim 7 and tire 4. This support 15 then takes on the supporting
function of the rim 7. To function properly, the support 15, by its
profile, must partly correspond to the profile of external walls of
the ancillary structure 6 containing the chamber 1 or the walls of
the tire 4 containing the chamber 1. The support 15 can efficiently
be part of the hubcap.
[0078] The chamber 1 can be created in the ancillary structure 6 by
gluing two strips of material together, e.g. two rubber strips,
which already have the chamber 1 profile impressed in them. These
strips can form a complete circle lengthwise with the chamber 1, or
at least a part of the circle in the same direction. Instead of
gluing together, the strips can be just placed over each other, and
they are then sealed by constant pressure between the tire 4 and
rim 7. These pressures exceed dozens of atmospheres at some points
of contact of contemporary rims 7 and tires 4.
[0079] The tire 7 wall cross-sections vary for different tires 4.
Production-simple solution is to place the chamber 1 into the
ancillary structure 6 and to provide the ancillary structure 6 with
a standardized profiled wall. The tires 4 must then be provided
with a similar profile of their walls in the point of contact with
the ancillary structure 6, which is a simple change in the tire 4
design. This can make sure that forces between the wall of the tire
4 and the ancillary structure 6 are more-less perpendicular to the
wall of the ancillary structure 6, and thus reduce the risk of
mutual shifting and abrasion.
Example 5
[0080] FIG. 5. a) shows the member 19. The top arc part of the
member 19 cross-section corresponds to the cross-section of the
chamber 1. Straight parts indicated as Vv and Vs include through
channels 913 interconnecting the faces 12 with the opposite ends of
Vv and Vs parts. The channels 913 are indicated by broken
arrows.
[0081] FIG. 5. b) shows fitting of the tire 4 onto the rim 7. Prior
to this, an impression of the matrix 9 was made in the tire 4,
along the entire circumference of the tire 4. Since the chamber 1
created in this way must be discontinued in order to function, the
discontinuation will be made by inserting the member 19, which at
least in one of its points corresponds to the chamber 1
cross-section. This member 19, which will prevent air permeation
between the parts of the chamber 1 through the part of the chamber
1 with the member 19 inserted.
[0082] A part of the member 19 is inserted into the chamber 1, with
its shape corresponding to the chamber 1 profile. The profile of
this part of the member 19 corresponds to the A-A cross-section on
FIG. 5. a). After complete fitting of the tire 4 onto the rim 7
shown on FIG. 5. c), the walls of the chamber 1 and the walls of
the member 19 will get sealed and make the chamber 1 impermeable in
this part.
[0083] FIG. 5. d) shows the insertion of the member 19, including
its Vv part, between the walls of the chamber 1 and also between
the tire 4 and rim 7. After complete fitting of the tire 4 onto the
rim 7 shown on FIG. 5. e), the member 19, including its Vv part ,
the chamber 1, tire 4, and rim 7 will seal together. The chamber 1
is interconnected between the face 12 of the member 19 and the
internal space of the tire 4 by the channel 913 placed in a part of
the member 19 marked as Vv. The section of the part of the member
19 indicated as B-B on FIG. 5. a) corresponds to the section of the
member 19 shown on FIGS. 5. d) and 5. e), while, however, on FIGS.
5. d) and 5. e) the member is bent in its Vv part in order to copy
its lead-out of the chamber 1.
[0084] Accordingly, the chamber 1 is interconnected between the
opposite face 12 of the member 19 and the external environment by
another channel 913 placed in a part of the member 19 marked as Vs,
as is shown on FIG. 5. f). The section of a part of the member 19
indicated as C-C on FIG. 5. a) corresponds to the section of the
member 19 shown on FIG. 5. f), while FIG. 5. f) shows the member 19
bent in its Vs part in order to copy its lead-out of the chamber
1.
[0085] Channels 913 can also be embedded in the wall of the tire 4
or rim 7, or formed inside the wall of the tire 4 or rim 7, and
they need not be an integral part of the member 19.
Example 6
[0086] If the deformable part of the chamber 1 is made almost along
the entire circumference of the tire 4, then at the same time, the
chamber 1 will be diagonally closed by deformation in points of its
inlet and outlet during the revolution of each tire 4, and there
will be no total pressure equalizing with the internal space of the
tire 4 or external environment in the face of the chamber 1, which
can then lead to inability to set the built-in output pressure
through compression ratio of the deformable and non-deformable part
of the chamber 1. If the output pressure of the chamber 1 is
controlled by the valve operated depending on pressure in the tire
4, the output pressure need not be adjusted through the ratio of
parts of the chamber 1, and the non-deformable part of the chamber
1 is not essential, but still can be present. In this case, the
inability to set the output pressure of the chamber 1 through the
built-in output pressure does not necessarily mean a hindrance.
[0087] When the output pressure of the chamber 1 is set by the
built-in output pressure of the chamber 1 and also when the chamber
1 is provided with a valve enabling deflating the tire 4 through
the chamber 1 it is suitable to put the inlet and outlet of at
least a part of the chamber 1, deformable to zero cross-section
area of the chamber 1, to a relative distance that will allow that
at least once during one revolution of the loaded tire 4, the whole
chamber will be at the place unloaded by the tire 4 deformation
causing the deformation of the chamber 1 to its zero cross-section
area. It means that all parts of the deformable part of the chamber
1 will be interconnected with each other at least once per loaded
wheel revolution.
[0088] The distance between the inlet and outlet is given, for
example, by the length of the member 19. The chamber 1 can also be
made in the required length of the tire 4 circumference by using
the matrix 9 that will be shorter than the circumference of the
tire 4 by the length of the tire 4 circumference deformed by
loading the tire 4, or possibly by a greater distance.
[0089] The difference between the length of the matrix 9 and the
length of the entire tire 4 circumference can be then filled with
liquid material of the tire 4 walls upon vulcanization of the tire
4.
[0090] In manufacture of the chamber 1, it is also possible to use
the matrix 9 in the required length of the chamber 1 with the
additional part of the matrix 9 added, which will remain in the
wall of the tire 4 after its vulcanization of the tire 4 and
chamber 1 and will eliminate the need of insertion of the member
19, or the need of moving the material within the tire 4 wall upon
vulcanization.
Example 7
[0091] FIG. 6. a) shows a cross-section through the chamber 1 with
an impressed matrix 9. After vulcanization, the matrix 9 creates
the chamber 1 with the extended surfaces of the chamber 1 walls.
The broken arrows on FIG. 6. b) represent application of pressure
on the wall of the chamber 1 roughly in parallel with the extended
surfaces of the chamber 1 wall and the withdrawing the chamber 1
walls from the matrix 9. A part of the matrix 9 contracts. There is
only a minimum contact between the walls of the matrix 9 and
chamber 1 and the matrix 9 can be extracted from the chamber 1
lengthwise. FIG. 6 shows the chamber 1 after extraction of the
matrix 9 and before fitting between the tire 4 and rim 7. FIG. 6.
d) shows the chamber 1 after being fitted between the unloaded tire
4 and rim 7. The surfaces 10 of the chamber 1 walls will fit tight
on each other and make a zero angle between each other. FIG. 6. e)
shows the chamber 1 at the point loaded by deformation of the tire
4. All the walls of the chamber 1 fit together and make a zero
cross-section area of the chamber 1 at this point.
Example 8
[0092] The tire 4, ancillary structure 6, rim 7, and support 15 or
hubcap all can include formed parts and components of the chamber
1. For example, a part of the chamber 1 deformable to a zero
cross-section area of the chamber 1 formed in the ancillary
structure 6, suction inlet with a filter in the rim 7; the
discharge channel can be led through the wall of the chamber 4. All
these components can intercommunicate through the openings, which
will be created against each other on the individual
intercommunicating components, while the edges of these openings
will be pressed together and sealed by the pressure between the
tire 4 and rim 7. Since the parts such as tire 4, rim 7, ancillary
structure 6, hubcap or support 15 are always at least partly
concentric, the openings can be made in the same distance from the
axis and when assembling the wheel it must only be ensured that
they are placed opposite even along the circumference. The correct
assembly along the circumference can be made easier by making
recesses along the longer part of circumference or along the entire
circumference of at least one communicating component. Thus the
communication opening of the opposite interconnected component will
always be against the recess after the assembly of the wheel. Even
when the recess is made not along the whole component circumference
but only along the part of it, the communication opening of the
opposing component will then fit more easily than if both
communication channels had small dimensions.
[0093] FIG. 7. a) shows the section through the tire 4 indicated by
light gray color, including the chamber 1 interconnected by a
channel with the diameter of 0.5 mm leading into the recess Z on
the outer wall of the tire 4 between the outer wall of the tire 4
and rim 7. The recess Z has thickness of 1 mm, width of 2 mm and it
closes the circle, i.e. its length corresponds with the entire
length of the circumference of the tire 4 and/or rim 7 at this
area. An opening O with the diameter of 0.5 mm indicated by dark
gray color is made in the rim 7 against the recess Z, which
connects the recess Z with the external environment. The opening O
will always be located against the recess Z, even in the event of
swing of the tire 4 against the rim 7. At the same time, they will
always be sealed together by pressure of the tire 4, or the
ancillary structure 6, onto the rim 7. The dotted-broken arrow
indicates the air flow from the external environment through the
opening O in the rim 7 into the recess Z; the broken arrow
indicates the air flow from the recess Z through the channel into
the chamber 1. The recess Z and opening O will therefore become a
part of the channel.
Example 9
[0094] Picture 8. a) shows the tire 4, ancillary structure 6, rim
7, and support 15. The ancillary structure 6 partly leans against
the wall of the tire 4, partly against the rim 7, and partly
against the support 15. In this case, the support 15 completes the
rim 7 and unlike the rim 7 at this point, it corresponds to the
profile of the wall of the ancillary structure 6. Moreover, the
support 15 in this example allows the extension of the ancillary
structure 6 to places, where it would not be otherwise possible to
use the approaching of the tire 4 to the rim 7. Efficiently, the
support 15 is solid, e.g. made of steel or plastic. It can be also
made of little compressible material, e.g. vulcanized rubber.
UTILITY OF THE PATENT
[0095] The chamber with shape memory for pressure correction in the
tire according to this invention will find its application in
production of new tires and in modification to existing tires, both
for passenger vehicles and utility vehicles.
* * * * *