U.S. patent application number 13/420322 was filed with the patent office on 2012-12-13 for filament winding method and apparatus, and tank.
This patent application is currently assigned to MURATA MACHINERY, LTD.. Invention is credited to Takenori AIYAMA, Motohiro TANIGAWA, Tadashi UOZUMI.
Application Number | 20120315569 13/420322 |
Document ID | / |
Family ID | 45887965 |
Filed Date | 2012-12-13 |
United States Patent
Application |
20120315569 |
Kind Code |
A1 |
TANIGAWA; Motohiro ; et
al. |
December 13, 2012 |
Filament Winding Method and Apparatus, and Tank
Abstract
In a filament winding method, while a rotating tank relatively
reciprocates in a tank axial direction to a helical winding head,
fibers are fed from yarn-feeding sections to the tank. After the
tank turns back in the tank axial direction, a large number of
fibers are wound around one domed portion and a trunk portion of
the tank, and trailing ends of the large number of fibers are
located at one end portion of the trunk portion. Then a piece or a
small number of fibers are fed from a rotating hoop winding head to
the trunk portion, and hoop winding is performed on helical winding
layers formed around the trunk portion. Then, at the one end
portion of the trunk portion, the large number of fibers pulled
from the yarn-feeding sections of the helical winding head are cut
off.
Inventors: |
TANIGAWA; Motohiro;
(Kyoto-shi, JP) ; UOZUMI; Tadashi; (Kyoto-shi,
JP) ; AIYAMA; Takenori; (Toyota-shi, JP) |
Assignee: |
MURATA MACHINERY, LTD.
Kyoto-shi
JP
|
Family ID: |
45887965 |
Appl. No.: |
13/420322 |
Filed: |
March 14, 2012 |
Current U.S.
Class: |
429/515 ;
156/172 |
Current CPC
Class: |
Y02E 60/50 20130101;
B29L 2031/7172 20130101; B29C 53/64 20130101; B29C 53/602 20130101;
B65H 81/02 20130101; B29C 70/32 20130101; H01M 8/04 20130101 |
Class at
Publication: |
429/515 ;
156/172 |
International
Class: |
H01M 8/04 20060101
H01M008/04; B65H 81/00 20060101 B65H081/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 10, 2011 |
JP |
2011-130626 |
Claims
1. A filament winding method for winding fibers around a tank
composed of a trunk portion having a uniform radius in a tank axial
direction and a pair of domed portions, wherein each of the domed
portions communicates with a corresponding end portion of the trunk
portion in the tank axial direction and is formed with a diameter
that becomes smaller outward in the tank axial direction,
comprising the steps of: a first step wherein while the tank, which
is rotating, relatively reciprocates in the tank axial direction to
a helical winding head, fibers are fed from each of a plurality of
yarn-feeding sections to the tank, wherein the helical winding head
includes the plurality of yarn-feeding sections arranged on a
concentric circle around the tank; a second step wherein after the
tank turns back in the tank axial direction, a large number of
fibers are wound around one of the domed portions and the trunk
portion of the tank, and trailing ends of the large number of
fibers are located at one end portion of the trunk portion; and a
third step wherein after the second step, a piece or a small number
of fibers are fed from a rotating hoop winding head to the trunk
portion, and hoop winding is performed on helical winding layers
formed around the trunk portion, and then at the one end portion of
the trunk portion, the large number of fibers pulled from the
yarn-feeding sections of the helical winding head are cut off.
2. A filament winding apparatus for winding fibers around a tank
composed of a trunk portion having a uniform radius in a tank axial
direction and a pair of domed portions, wherein each of the domed
portions communicates with a corresponding end portion of the trunk
portion of the tank in the tank axial direction and is formed with
a diameter that becomes smaller outward in the axial direction,
comprising: a helical winding head having a plurality of
yarn-feeding sections arranged on a concentric circle around the
tank, wherein each yarn-feeding section feeds fibers to the tank; a
hoop winding head arranged to feed a piece or a small number of
fibers to the tank; a first moving device arranged to relatively
move the tank in the tank axial direction to the helical winding
head; a second moving device arranged to relatively move the hoop
winding head in the tank axial direction to the tank; a controlling
device arranged to control movements of the first moving device,
the second moving device, the helical winding head and the hoop
winding head, wherein: while the tank, which is rotating,
relatively reciprocates in the tank axial direction to the helical
winding head, fibers are fed from each yarn-feeding section to the
tank, after the tank turns back in the axial direction, a large
number of fibers are wound around one of the domed portions and the
trunk portion, and trailing ends of the large number of fibers are
located at one end portion of the tank, then the hoop winding head,
which is rotating, feeds a piece or a small number of fibers to the
trunk portion and hoop winding is performed on helical winding
layers, and then, at the one end portion of the trunk portion, the
large number of fibers pulled from each yarn-feeding section of the
helical winding head are cut off.
3. A tank, whose circumference surface is wound with fibers,
composed of a trunk portion having a uniform radius in a tank axial
direction and a pair of domed portions, wherein each of the domed
portions communicates with a corresponding end portion of the tank
in the tank axial direction and is formed with a diameter that
becomes smaller outward in the tank axial direction, wherein an
outermost layer of a large number of fibers wound with helical
winding is formed on one of the domed portions and the trunk
portion, trailing ends of the large number of fibers are located at
one end portion of the trunk portion, hoop winding layers are
formed on the outermost helical winding layer formed around the
trunk portion, and cut edges of the large number of fibers wound
with helical winding are located at the one end portion of the
trunk portion.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority under 35 U.S.C. 119 to
Japanese Patent Application No. 2011-130626, filed on Jun. 10,
2011, which application is hereby incorporated by reference in its
entirety.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a filament winding method,
a filament winding apparatus and a tank.
[0004] 2. Description of the Related Art
[0005] A fuel cell power system is mounted, for example, in a
vehicle or the like, and a gas tank is used as a source of fuel gas
supply.
[0006] This type of gas tank is made by a filament winding method
(hereinafter referred to as "FW method"). The FW method includes a
process of forming a fiber reinforced plastics (FRP) layer around a
substantially ellipse liner (inner container). In this process,
fibers impregnated with thermosetting resins are usually wound
around the liner.
[0007] In the FW method, hoop winding and helical winding are both
performed. In the hoop winding, the FRPs are wound around a tank
perpendicular to the tank axis. In the helical winding, the FRPs
are wound around the tank obliquely to the tank axis. The hoop
winding and the helical winding are alternately performed at
predetermined times, and fiber reinforced plastics layers are
formed around a circumference surface of the gas tank.
[0008] The helical winding of the FW method includes a multi-yarn
feeding method, in which a large number of fibers are
simultaneously wound around a liner from multiple directions. This
multi-yarn feeding method significantly reduces the time taken to
wind fibers around a liner.
[0009] In the multi-yarn feeding method, a helical winding head is
used. The helical winding head feeds a large number of fibers to a
gas tank from a plurality of positions on a concentric circle
around the gas tank. While the rotating gas tank relatively
reciprocates in the tank axial direction to the helical winding
head, a plurality of fibers are fed from the helical winding head
to the gas tank. In this way, the helical winding is performed on
the gas tank.
[0010] Meanwhile, at the end of the helical winding, trailing ends
of a large number of fibers need to be fastened to the gas tank. As
a method for fastening the trailing ends, the following methods
have already been proposed: a method for twisting the trailing ends
of fibers around mouthpieces positioned at both ends of a gas tank
or a method for securing the trailing ends of fibers with a resin
clip to the gas tank.
SUMMARY OF THE INVENTION
[0011] In the method for twisting trailing ends of fibers around a
mouthpiece of a gas tank, however, as a large number of fibers are
wound intensively around the mouthpiece, the length of the
mouthpiece needs to be long in the tank axial direction. Further,
the trailing ends of the fibers after the twisting need to be
fastened, which is a troublesome job.
[0012] In the method for fastening trailing ends of fibers with a
resin clip to a gas tank, each trailing end of one hundred (100) or
more fibers needs to be fastened one by one, and then the operation
needs to be confirmed. These operations are complicated and take
time.
[0013] According to the present invention, the helical winding with
the multi-yarn feeding method facilitates the operation to fasten
fiber trailing ends to a gas tank.
[0014] One aspect of the present invention is a filament winding
method for winding fibers around a tank. The tank is composed of a
trunk portion and a pair of domed portions. The trunk portion has a
uniform radius in a tank axial direction. Each of the domed
portions communicates with a corresponding end portion of the trunk
portion in the tank axial direction and is formed with a diameter
that becomes smaller outward in the tank axial direction. The
helical winding head has a plurality of yarn-feeding sections
arranged on a concentric circle around the tank. While the rotating
tank relatively reciprocates in the tank axial direction to the
helical winding head, fibers are fed from each yarn-feeding section
to the tank. After the tank turns back in the tank axial direction,
a large number of fibers are wound around one of the domed portions
and the trunk portion of the tank, and trailing ends of the large
number of fibers are located at one end portion of the trunk
portion. Then, a rotating hoop winding head feeds a piece or a
small number of fibers to the trunk portion, and hoop winding is
performed on helical winding layers formed around the trunk
portion. Then, at the one end portion of the trunk portion,
trailing ends of the large number of fibers pulled from the
yarn-feeding sections of the helical winding head are cut off.
[0015] Another aspect of the present invention is a filament
winding apparatus. The filament winding apparatus winds fibers
around a tank. The tank is composed of a trunk portion and a pair
of domed portions. The trunk portion has a uniform radius in a tank
axial direction. Each of the domed portions communicates with a
corresponding end portion of the trunk portion in the tank axial
direction and is formed with a diameter that becomes smaller
outward in the tank axial direction. The filament winding apparatus
includes a helical winding head, a hoop winding head, a first
moving device, a second moving device and a controlling device. The
helical winding head has a plurality of yarn-feeding sections
arranged on a concentric circle around the tank, each of which
feeds fibers to the tank. The hoop winding head feeds fibers to the
tank. The first moving device relatively moves the tank in the tank
axial direction to the helical winding head. The second moving
device relatively moves the hoop winding head in the tank axial
direction to the tank. The controlling device controls movements of
the first and the second moving devices and helical and hoop
winding heads. While a rotating tank relatively reciprocates in the
tank axial direction to the helical winding head, a fiber is fed
from each yarn-feeding section to the tank. After the tank turns
back in the tank axial direction, a large number of fibers are
wound around one of the domed portions and the trunk portion, and
trailing ends of the large number of fibers are located at one end
portion of the trunk portion. Then, a piece or a small number of
fibers are fed from the rotating hoop winding head to the trunk
portion, and hoop winding is performed over helical winding layers
formed around the trunk portion. Then, at the one end portion of
the trunk portion, trailing ends of the large number of fibers
pulled from the yarn-feeding sections of the helical winding head
are cut off.
[0016] Yet another aspect of the present invention is a tank whose
outer circumference surface is wound with fibers. The tank is
composed of a trunk portion and a pair of domed portions. The trunk
portion has a uniform radius in a tank axial direction. Each of the
domed portions communicates with a corresponding end portion of the
trunk portion in the tank axial direction and is formed with a
diameter that becomes smaller outward in the tank axial direction.
The outermost layer of a large number of fibers wound with the
helical winding is formed on one of the domed portions and the
trunk portion. Trailing ends of the large number of fibers are
located at one end portion of the trunk portion. A hoop winding
layer is formed around the outermost helical winding layer formed
around the trunk portion. Cut edges of the large number of fibers
wound with the helical winding are located at the one end portion
of the trunk portion.
[0017] According to the above-described aspects of the invention,
as the trailing ends of the large number of fibers wound with the
helical winding are fastened at once with the hoop winding, it is
easy to fasten the trailing ends of the large number of fibers.
[0018] Other features, elements, processes, steps, characteristics
and advantages of the present invention will become more apparent
from the following detailed description of embodiments of the
present invention with reference to the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] FIG. 1 is a schematic view illustrating a filament winding
apparatus according to an embodiment of the present invention.
[0020] FIG. 2 is a front view schematically illustrating a helical
winding head.
[0021] FIGS. 3A to 3E are views describing operations of a gas
tank, a hoop winding head, and a helical winding head in each
process.
DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION
[0022] An embodiment of the present invention will be described
with reference to the drawings. FIG. 1 is a schematic view
illustrating a filament winding apparatus (hereinafter referred to
as "FW apparatus") 1 in accordance with an embodiment of the
present invention.
[0023] The FW apparatus 1 includes a base 10, a tank supporting
unit 11, a helical winding head 12, a hoop winding head 13, a first
moving device 14, a second moving device 15 and a controlling
device 16. The tank supporting unit 11 is arranged on the base 10
to be capable of moving in the tank axial direction, and supports a
gas tank 2 to be capable of rotating. The helical winding head 12
is fixedly attached on the base 10 in the tank axial direction, and
performs helical winding on a circumference surface of the gas tank
2 by simultaneously feeding a large number of fibers 300 to the gas
tank 2 supported with the tank supporting unit 11. The hoop winding
head 13 is arranged on the base 10 to be capable of moving in the
tank axial direction, is capable of rotating, and performs hoop
winding on the circumference surface of the gas tank 2 by
simultaneously feeding a piece or a small number of fibers 300 to
the gas tank 2. The first moving device 14 reciprocates the tank
supporting unit 11 in the tank axial direction X, and relatively
moves the gas tank 2 in the tank axial direction X to the helical
winding head 12. The second moving device 15 reciprocates the hoop
winding head 13 in the tank axial direction X, and relatively moves
the hoop winding head 13 in the tank axial direction X to the
static gas tank 2 supported with the tank supporting unit 11. The
controlling device 16 controls movements of these devices and
units.
[0024] The tank supporting unit 11 includes a pair of shafts 20, a
pair of chucks 21, a pair of supporting columns 22, and a moving
base 23. Each of the chucks 21 is structured to be capable of
coupling with a mouthpiece 3 provided at each end portion of the
gas tank 2. Each of the chucks 21 holds an outward end portion of
each shaft 20. Each of the supporting columns 22 holds each of the
supporting columns 21. The paired supporting columns 22 are fixedly
attached on the moving base 23 which moves in the tank axial
direction X to the base 10. The paired chucks 21 are provided with
a rotation drive source which rotates the gas tank 2 by rotating
the shafts 20. A rail 24 is arranged on the base 10 along with the
tank axial direction X. The moving base 23 is arranged on the rail
24, and reciprocates along the rail 24 with a drive source 25. The
drive source 25 is, for example, an electric motor. With this
configuration, the gas tank 2 supported with the paired shafts 20
reciprocates in the tank axial direction X. In a present
embodiment, the first moving device 14 is composed of the moving
base 23, the rail 24 and the drive source 25.
[0025] The helical winding head 12 includes a guide ring 30, guide
tubes 31 as a multi-yarn-feeding section, and yarn-feeding port
moving devices 33. As illustrated in FIG. 2, the guide ring 30 is a
perfect circle, and is arranged around the gas tank 2 so as to have
the same center as the tank axis. A plurality of guide tubes 31 are
arranged in a concyclic manner at equal intervals on the guide ring
30, and each guide tube 31 feeds a piece of FRP 300 to the gas tank
2. The yarn-feeding port moving devices 33 move yarn-feeding ports
32 of all guide tubes 31 in the direction Y in which the
yarn-feeding ports 32 move away from and approach the tank axial
center.
[0026] Each guide tube 31, whose yarn-feeding port 32 faces toward
the axial center of the gas tank 2, is arranged in a radial manner.
Tube holders 40 fix the guide tubes 31 to the guide ring 30. A
piece of fiber 300 is inserted into each guide tube 31 from the
outside toward the tank axial center, and is pulled from the
yarn-feeding port 32 at the edge of the guide tube 31 in the side
of the gas tank 2.
[0027] The yarn-feeding port moving device 33 may be composed of,
for example, a gear mechanism and its drive source.
[0028] A supporting member 60 is fixedly attached to the base 10,
and the plurality of guide tubes 31 are supported with the
supporting member 60 via the guide rings 30.
[0029] The hoop winding head 13 includes a rotation ring 70, which
is capable of rotating, and one or a small number of yarn-feeding
section(s) 71 (a small number of yarn-feeding sections in an
embodiment indicated in FIG. 1). The gas tank is capable of
coaxially coming into/out from a hollow portion of the rotation
ring 70. The hoop winding head 13 is supported with a supporting
member 72. A rail 73 is attached on the base 10 along with the tank
axial direction X, and a drive source 74, such as a motor,
reciprocates the supporting member 72 on the rail 73 in the tank
axial direction X. In a present embodiment, the second moving
device 15 is composed of the supporting member 72, the rail 73 and
the drive source 74.
[0030] The controlling device 16 controls movements of, at least,
the helical winding head 12, the hoop winding head 13, the first
and the second moving devices 14, 15 in accordance with, for
example, a program stored in a storage section, and thus the FW
method, which is described later, is executed on the gas tank
2.
[0031] An FW method using the FW apparatus 1 will be described
below.
[0032] As illustrated in FIG. 1, the gas tank 2 is supported with
the tank supporting unit 11, which allows the gas tank 2 to rotate
and reciprocate in the tank axial direction X. The hoop winding and
the helical winding are alternately performed for the gas tank 2 at
predetermined times, and FRP layers are formed on a circumference
surface of the gas tank 2.
[0033] In a step of the hoop winding, while each yarn-feeding
section 71 feeds a piece of fiber 300 to the gas tank 2 in
conjunction with rotation of the rotation ring 70 of the hoop
winding head 13 around the tank axial center, the hoop winding head
13 reciprocates in the tank axial direction X between both ends of
the trunk portion 201 at a low speed. In this way, the fibers 300
are wound around the trunk portion 201 of the gas tank 2 with the
hoop winding.
[0034] In a step of the helical winding, while the gas tank 2,
which is rotating upon the tank axis, reciprocates in the tank
axial direction X at a high speed to the helical winding head 12
between the mouthpieces 3 arranged at both ends of the gas tank 2,
a piece of fiber 300 is fed from each guide tube of the helical
winding head 12. Accordingly, a large number of fibers 300 are
simultaneously wound around the whole portion of the gas tank 2
(trunk portion 201 and domed portions 202) with the helical
winding.
[0035] A method for fastening fiber trailing ends to the gas tank 2
with the helical winding of the FW method according to the present
invention is described below.
[0036] As illustrated in FIG. 3A, the gas tank 2 and the hoop
winding head 13 move at an equal speed in the tank axial direction
X to the side of the helical winding head 12 (rightward in FIG. 3A)
while synchronously rotating at an equal angular velocity. Then,
when the gas tank 2 is passing through the hollow portion of the
helical winding head 12, a large number of fibers 300 are wound
around the gas tank 2. Note that, as the helical winding head 12 is
fixedly attached, it is incapable of moving.
[0037] Then, once the large number of fibers 300 are wound to the
one end portion 400 of the gas tank 2 (left end in FIG. 3B), the
gas tank 2 and the hoop winding head 13 turn back (going around in
the tank axial direction) and move in the direction in which the
gas tank 2 moves away from the helical winding head 12 (leftward in
FIG. 3B). At this time, as the gas tank 2 and the hoop winding head
13 continue to synchronously rotate at equal angular velocity, the
large number of fibers 300 are pulled from the helical winding head
and are wound around the gas tank 2. Then, the large number of
fibers 300 are wound in this order from the one end portion 400 of
the gas tank 2 through the one domed portion 202 (left domed
portion 202 in FIG. 3B) and the trunk portion 201. Then, rotation
and movement in the tank axial direction of the gas tank 2 are
stopped, and feeding of the large number of fibers 300 from the
helical winding head 12 is also stopped. In this way, at the
outermost layer of the helical winding, the large number of fibers
300 are wound around only one domed portion 202 (left side in FIG.
3B) and the trunk portion 201, and the trailing ends of all fibers
300 are located at the other end portion 500 of the trunk portion
201.
[0038] Then, while rotation and movement in the tank axial
direction X are stopped, the hoop winding head 13 moves in the tank
axial direction X to the side of the helical winding head
(rightward in FIG. 3C) while rotating, a small number of fibers 300
are wound around the trunk portion 201 of the gas tank 2. Once the
small number of fibers 300 are wound around to the other end
portion 500 of the trunk portion 201, rotation and movement of the
hoop winding head 13 are stopped, and feeding of the small number
of fibers 300 from the hoop winding head 13 is also stopped. Fiber
trailing ends of a hoop winding layer are fastened to the gas tank
2. Methods for fastening fiber trailing ends include bonding by
thermo compression bonding and with adhesive, and folding trailing
ends into a fiber of an inner layer. In this way, as illustrated in
FIG. 3D, hoop winding layers are formed on the outermost helical
winding layer of the trunk portion 201, and the hoop winding layers
press the trailing ends of the large number of fibers 300 wound
with the helical winding against the gas tank 2. Alternatively, the
hoop winding head 13 may form multi hoop winding layers on the
fibers 300 wound with the helical winding by reciprocating along
the trunk portion 201 one or more times. After feeding of a small
number of fibers 300 is stopped, the hoop winding head 13 moves
further to the side of the helical winding head 12 (rightward in
FIG. 3D). Also, the gas tank 2 moves in the direction in which the
gas tank 2 moves away from the helical winding head 12 (leftward in
FIG. 3D) and moves away from each hollow portion of the hoop
winding head 13 and the helical winding head 12.
[0039] Next, as illustrated in FIG. 3E, the fibers 300 pulled from
the helical winding head 12 are all cut off at the end portion 500
on the other side of the trunk portion 201 where the trailing ends
of the large number of fibers 300 are located. Then, all fibers 300
pulled from the helical winding head 12 are also cut off.
[0040] According to the embodiment of the present invention, hoop
winding layers fasten the fiber trailing ends of the large number
of fibers 300 wound with the helical winding at once. Thus, in the
multi-yarn feeding method, it becomes easy to fasten the fiber
trailing ends wound with the helical winding, which eventually
reduces the time taken to fasten fiber trailing ends wound with the
helical winding. Helical winding is performed to the other end
portion 500 of the trunk portion 201, and as hoop winding is
performed over the entire length of the trunk portion 201, the
trailing ends of the fibers 300 wound with the helical winding are
fastened firmly. Further, it becomes possible to visually confirm
the trailing ends of the fibers 300 wound with the helical
winding.
[0041] Embodiments of the present invention have been described
with reference to attached drawings. However, the present invention
is not limited to these embodiments.
[0042] In the embodiments described above, the gas tank 2 moves in
the tank axial direction X during a helical winding operation.
However, the helical winding head 12 may move in the tank axial
direction X. Further, in the embodiments described above, the hoop
winding head 13 moves in the tank axial direction X during a hoop
winding operation. However, the gas tank 2 may move in the tank
axial direction X.
[0043] The FW apparatus 1 and the FW method in accordance with the
present embodiments can be applied not only to manufacturing of
tanks used in fuel-cell power vehicles but also manufacturing of
tanks used in other types of vehicles, such as electric automobiles
or hybrid automobiles, various transporting vehicles, such as
vessels, air planes, or robots, and fixed buildings, such as a
residence and a building.
[0044] While the present invention has been described with respect
to embodiments thereof, it will be apparent to those skilled in the
art that the disclosed invention may be modified in numerous ways
and may assume many embodiments other than those specifically set
out and described above. Accordingly, it is intended by the
appended claims to cover all modifications of the present invention
that fall within the true spirit and scope of the present
invention.
* * * * *