U.S. patent application number 11/790152 was filed with the patent office on 2008-10-30 for hydraulic pump system with integrated distributor valve.
This patent application is currently assigned to ABER-EMBRAIAGENS E COMANDOS HIDRAULICOS, ANTONIO BERNARDES, LDA. Invention is credited to Rui Jorge da Silva Bernardes.
Application Number | 20080267794 11/790152 |
Document ID | / |
Family ID | 39712494 |
Filed Date | 2008-10-30 |
United States Patent
Application |
20080267794 |
Kind Code |
A1 |
da Silva Bernardes; Rui
Jorge |
October 30, 2008 |
Hydraulic pump system with integrated distributor valve
Abstract
The present invention is concerning a hydraulic pump system with
integrated distributor valve, which is generally applied in a
hydraulic circuit normally constituted of an oil deposit (39), a
cylinder (40), a module of Pneumatic control (41), and a hydraulic
pump with integrated distributor valve (42). The system object of
the present invention presents a reduction of the accidents and
ruptures in the gear box, operates with higher pressures, reduces
the vibrations and prevents clearances and consuming of the pump.
The present invention is applicable mainly to power take off's (43)
that are located in the gear box of the trucks.
Inventors: |
da Silva Bernardes; Rui Jorge;
(Maia, PT) |
Correspondence
Address: |
SUGHRUE MION, PLLC
2100 PENNSYLVANIA AVENUE, N.W., SUITE 800
WASHINGTON
DC
20037
US
|
Assignee: |
ABER-EMBRAIAGENS E COMANDOS
HIDRAULICOS, ANTONIO BERNARDES, LDA
Maia
PT
|
Family ID: |
39712494 |
Appl. No.: |
11/790152 |
Filed: |
April 24, 2007 |
Current U.S.
Class: |
417/375 |
Current CPC
Class: |
F04C 2/086 20130101;
F04C 2/18 20130101; F04C 2240/30 20130101 |
Class at
Publication: |
417/375 |
International
Class: |
F04B 35/02 20060101
F04B035/02 |
Claims
1. System of hydraulic pump with integrated distributor valve,
characterized for being set up by two main parts, the set
aggregated to the cover and the set aggregated to the body, of
which the set of the cover, which guides, seals and supports the
setting of the system, is composed of: a body with internal
channels for lubrication of the generating elements of power which
are connected to the tank and the cover has also an internal
channel for connection of the generating elements of power. This
lubrication and liberation of the internal pressure peaks pass from
the cover to the body channels through the internal hole of the
generating element of power two sealing elements to prevent losses
of oil and to guarantee the separation of the oil of the hydraulic
system and the gear box; two sleeves that guarantee the support to
centring and functioning of the generating elements of power or
load; a roll bearing for the support of the output axle; two rings
for the positioning and functioning of the sealing and rolling
elements, respectively; it may have two relief valves responsible
for the isolation of pressures; where the set of the body, that
aspirates the oil of the deposit, carries it out internally from
the pump to the distributor and sends it to the cylinder or to the
deposit, as is composed of: two sleeves for the support, the
centring and the functioning of the mentioned elements; two
compensating pressure plates, located in the extremities of the
mentioned elements, of which at least one possess a seal to seal,
isolate and absorb vibrations; an output axle and a gear axle
drilled trough its interior to allow to the lubrication of the roll
bearings or sleeves and to protect the seal against internal
pressure leaks, guiding these through its interior for a channel
that internally leads them to the connection, responsible for
generating power or load; at least two bolts so that it allows a
centred assembly; a relief valve with incorporated anti return,
mounted at the exit of the pump, that controls and regulates the
pressure and protects the pump and the cylinder during all working
situations that involve pressure peaks; sealing elements
responsible for preventing losses of oil, guaranteeing the
separation of the oil and supporting high pressures; a spring to
reset a distribution axle; two support spring washers in which the
spring is mounted; a posterior cover, that protects the spring and
lodges the sealing elements, the support spring washer and the
spring; a distributor axle of extension that is mounted in the
distribution axle; a positioning ring of the support spring washer
and of the spring; a distribution axle that guides the oil; a
piston and sealing elements that make the sealing of the pneumatic
command; one shaft washer and a screw to fix the piston to the
distribution axle; a cover of pneumatic command.
2. Hydraulic pump system in accordance with claim 1, characterized
for the compensating pressure plates being made of bronze,
aluminium or steel with projected bronze.
3. Hydraulic pump system in accordance with claim 1, characterized
for the compensating pressure plates, which are lodged in cavities
specifically made in the body, being constituted of two drilled
circular parts in the shape of eight, in order to be able to
compensate the pressure difference, to which the two generating
elements of power or load are subject to.
4. Hydraulic pump system in accordance with claim 3, characterized
for the sealing of the compensating plates to be inserted in a hole
along the perimeter of the plates and to possess a rectangular
section responsible for the sealing and in the extremities can have
inferior platforms responsible for the damping of the
vibrations.
5. Hydraulic pump system in accordance with claim 1, characterized
for the generating elements of power or load being pistons or gear
wheels.
6. Hydraulic pump system in accordance with claim 1, characterized
for having in the body of the pump the admission of the system made
by the connection; the exit to the oil deposit made by the
connection; and the exit to the cylinder made by the
connection.
7. Hydraulic pump system in accordance with claim 1, characterized
for having a pneumatic control for setting in motion the valve of
the hydraulic pump system with integrated distributor valve.
8. The relief valve for peak pressures can have enough dimension so
that the hydraulic pump system with integrated valve will not need
the cable to set in motion the oil flow distributor axle because
the oil is taken directly from the pump to the tank, that is, this
system might not need a system of end stroke valve.
Description
TECHNICAL DOMAIN OF THE INVENTION
[0001] The present invention is about a hydraulic pump system with
integrated distributor valve constituted of two parts, which is
normally applied, directly or indirectly, to power take off's that
are located in the gear box of the trucks.
ANTECEDENTS OF THE INVENTION
[0002] The present invention is about a system of hydraulic pump
with integrated valve, which for its characteristics of conception
and functioning is different from the systems found in the
market.
[0003] The systems of hydraulic pump with integrated valve
presented in the market have a structure essentially composed of 3
(three) parts, which are the front cover, the body and the back
cover; while the present invention is composed of two parts, which
are the cover and the body. This type of structure differs from the
divulged in the present invention as, for example, in order to have
a functioning on a work pressure of 175 bar they need to have an
approximated weight of 32.2 Kg, and they still need cylinders of
superior dimension.
[0004] The requests of patent EP 0018216 and GB 1013263 are two
examples of hydraulic pumps with 3 (three) parts with improved
devices of retention of the liquid in the transmission chamber, but
with the inconveniences above mentioned.
[0005] The solution presented in the herewith request allows the
construction of smaller and lighter systems of pumps with
integrated valve and the possibility of working without relief
valves in the front cover. In fact, this new system of hydraulic
pump with integrated valve has differences on conception and
functioning that translate great economy in the conception,
assembly, and increase of efficiency and safety.
SUMMARY OF THE INVENTION
[0006] The system of the present invention includes a hydraulic
pump capable of operating under high pressures conditions with the
aid of compensating plates that are located in the extremities of
the generating elements of power or load.
[0007] The aim of the present invention is the supplying of a
solution for a pump system with integrated distributor valve,
constructed in two parts, that are the grouping of the cover, which
may be applied without the relief valves, and the body, which
supports without any problem pressures up to 200 bar, with a
maximum rotation of 1800 rpm, for an approximated weight of 22 Kg,
for a pump of .+-.105 cc. This system is normally applied to heavy
mobile equipment.
[0008] The system object of the present invention presents the
following advantages: [0009] Due to the less weight, it reduces the
accidents and ruptures in the gear box of the trucks; [0010] It
works under higher pressures which allow the use of cylinders with
inferior diameters, that is, a more economical use; [0011] It
permits the reduction of the vibrations, allowances and consuming
of the pump preventing this way damages and premature
substitutions. It is estimated that, for pressures above 200 bar,
there is a reduction of the damages in the order of 10-20%. [0012]
The possibility of not using relief valves in the front cover
eliminates the peaks of pressure in this front cover. The front
cover is the weakest part of the pump and therefore must be
protected against working failures. If the relief valves cease to
exist and the lubrication and internal pressure peaks are made
through the channel (44) of the pump body that connect the
generating elements of power (7 & 10) through an internal hole
along the element's (7) length to the tank (39), the leaking, the
pressure peaks and the infiltration problems are suppressed.
DESCRIPTION OF THE FIGURES
[0013] For a better understanding of the essence of the invention
we hereby describe the attached figures, which present a
preferential representation of the patent.
[0014] This way, the Figures represent:
[0015] FIG. 1--Front view of the set of the hydraulic pump with
integrated distributor valve;
[0016] FIG. 2--Axial cut view of the system of the hydraulic pump
with integrated distributor valve--plan of cut coincident with the
axles of the generating elements of power or load;
[0017] FIG. 3--Transversal cut view of the system of the hydraulic
pump with integrated distributor valve--horizontal cut plan and
coincident with the distribution axle;
[0018] FIG. 4--Detail of the mechanical command--option in the
purchase of the equipment;
[0019] FIG. 5--View of the cut of the pneumatic command of the
distributor valve;
[0020] FIG. 6--Front view and details of the section of the
compensating plates of pressure and of the seal;
[0021] FIG. 7--View of the anti return system, composed of a valve
plug and a sphere;
[0022] FIG. 8--View of cut of the relief valve with incorporated
anti return, composed of a screw, a nut, a pressure control screw,
two springs, a piston, a sphere carrier, two spheres, a valve plug,
a sleeve and three elements of sealing;
[0023] FIG. 9--Exploded perspective of the oil-hydraulic pump with
incorporated distributor valve;
[0024] FIG. 10--Perspective of the oil-hydraulic pump with
incorporated distributor valve--fixation flange and motion
transmission;
[0025] FIG. 11--View under perspective of the oil-hydraulic pump
with incorporated distributor valve--area of hydraulic
connections;
[0026] FIG. 12--View under perspective of the functioning scheme of
the hydraulic circuit with hydraulic pump and integrated
distributor valve.
[0027] FIG. 13--Channel that links the generating elements of
power--being one of them drilled longitudinally--to the tank, which
allows the non-use of the check system in the cover of this pump's
valve.
DESCRIPTION OF THE INVENTION
[0028] The object of the present invention is a system of hydraulic
pump with integrated distributor valve (42) that has at least the
following elements: [0029] two metal parts of which one part is the
body of the pump (33) and the other the cover of the pump (1);
[0030] two generating elements of power or load (10) and (7),
having the axle (7) a hole in its interior for lubrication of the
sleeves or roll bearings and protection against internal pressure
leaks, protecting this way the seal (3); [0031] two compensating
pressure plates (8), of which at least one has a seal (9); [0032]
at least one relief valve with incorporated anti return (14) in the
body of the pump; [0033] sealing system (3 & 6) to prevent oil
losses and to guarantee the separation of the oil of the hydraulic
system with the gear box and supporting high pressures; [0034] at
least four roll bearings or sleeves (5), two in the cover and two
in the body, of which one of them can be in the front of the cover
(1); [0035] a distributor shaft (22) for guidance of the oil;
[0036] a command, represented in FIG. 5, for pneumatic drive;
[0037] a spring (19) for repositioning of the pump shaft.
[0038] The compensating pressure plates (8) with seals (9) are
located in the extremities of the generating elements of power or
load and respectively maintained with the body of the pump
(33)/cover of the pump (1); these can be made of bronze, aluminium
or steel with projected bronze and have two drilled circular parts
in the shape of a eight, in order to be able to compensate the
pressure difference between the input and the output side, to which
the two generating elements of power or load (10 & 7) are
subject to. The seals of the compensating plates (9) made of
polymer, have a rectangular section and can have inferior platforms
in the extremities. The rectangular section is responsible for the
sealing and the inferior platforms prevent the vibrations, as it
can be observed in the details of FIG. 6.
[0039] The generating elements of power or load (10 & 7) of the
hydraulic pump system with integrated distributor valve (42) can be
pistons or gear wheels.
[0040] The system of hydraulic pump with integrated distributor
valve (42) is composed essentially of two main parts; the set
aggregated to the cover (1) and the set aggregated to the body
(33).
[0041] The set of the cover (1) has as function the guiding,
sealing and supporting of the setting of the system of hydraulic
pump with integrated distributor valve. In the cover (1) is
assembled: [0042] two sealing elements (3 & 6) which are
responsible for preventing oil losses, guaranteeing the separation
of the oil of the hydraulic system with the gear box, and
supporting high pressures; [0043] two sleeves (5) that assure the
support to the centring and the good functioning of the generating
elements of power or load (10 & 7); [0044] a roll bearing (2)
to improve the support of the output axle (10); [0045] two rings (4
& 34) to guarantee the positioning and the good functioning of
the elements (2 & 3); [0046] it can have (or not) two relief
valves (11) responsible for the isolation of pressures and
lubrication of the sleeves (5); [0047] a channel (44) that binds
the tank (39) to the sleeves for lubrication and protection against
leaks of internal pressure.
[0048] The set of the body (33) has as function the inhaling of the
oil of the deposit (39), carrying it internally from the pump to
the distributor and sending it to the cylinder (40) or to the
deposit (39). In the body (33) is assembled: [0049] two sleeves (5)
that guarantee the support to the centring and the good functioning
of the generating elements of power or load (10 & 7); [0050]
two compensating pressure plates (8), of which at least one has a
seal (9), that guarantees the sealing, isolation and prevents
vibrations; [0051] an output axle (10) and a gear axle (7)
responsible for the generation of power or load, having the axle
(7) a hole in its interior for lubrication of the sleeves or roll
bearings of the cover (1), and protection against internal pressure
leaks protecting this way the seal (3); [0052] at least two bolts
(13) to provide a centred assembly; [0053] a relief valve with
incorporated anti return (14), that controls and regulates the
pressure and protects the pump and the cylinder from receiving
pressure peaks; it can have enough dimension so that the hydraulic
pump system with integrated valve will not need the cable to set in
motion the oil flow distributor axle (22) because the oil is taken
directly from the pump to the tank, that is, this system might not
need a system of end stroke valve. [0054] five sealing elements
[(16), (21), (23), (24) and (35)] responsible for preventing losses
of oil, guaranteeing the separation of the oil and supporting high
pressures; [0055] a spring (19) that repositions the distribution
axle (22); [0056] two support spring washers (18), in which the
spring (19) is mounted; [0057] a posterior cover (17), whose
function is to protect the spring (19) and to lodge the sealing
elements (16), the support spring washer (18) and the spring (19);
[0058] a distributor extension axle (15) that is mounted in the
distribution axle (22); [0059] a ring (20) to guarantee the
positioning and the good functioning of the support spring washer
(18) and of the spring (19); [0060] a distribution axle (22) that
guides the oil to the intended positions made by the user; [0061] a
piston (25) that together with the sealing elements (24) makes the
sealing of the pneumatic command; [0062] one shaft washer (26) and
a screw (27) fix the piston (25) to the distribution axle (22);
[0063] a pneumatic command cover (28) receives the command.
[0064] In the case of choosing the mechanical command, it is
necessary to proceed to the alteration of the command that consists
of five operations, which are: [0065] the substitution of the
sealing element (24) for (32); [0066] the insertion of a sealing
element (16); [0067] the substitution of the piston (25) for the
mechanical control piston (31); [0068] the substitution of the
cover of the pneumatic command (28) for the cover of the mechanical
command (30); [0069] the substitution of the shaft O-ring (26) and
the screw (27) for the mechanical shaft control of extension
(29).
[0070] The admission of the system of hydraulic pump with
integrated distributor valve (42) is made by the connection (36).
The exit to the oil deposit (39) is made by the connection (37).
The exit to the cylinder (40) is made by the connection (38). The
element (39) is the oil deposit, necessary for the functioning of
the whole hydraulic system. The element (40) is the cylinder of the
system, which is set in motion by the oil coming from the system of
the hydraulic pump with integrated distributor valve (42).
[0071] The pneumatic control (41) is used to set in motion the
valve of the hydraulic pump system with integrated distributor
valve (42). The hydraulic pump system with integrated distributor
valve (42) is connected to the power take off (43) in order to get
the rotation movement.
[0072] In this hydraulic pump system with integrated distributor
valve (42), composed essentially of two parts, it is allowed the
use of compensation plates (8) of the hydraulic pressure, which are
lodged in cavities specifically created in the body (33) for the
plates (8). Or either, the bigger the exerted pressure, the better
is the compensation of the pump, allowing the operation under high
pressures, namely between 170 to 200 bar, and with efficiencies
above 85%.
[0073] As this system allows the use under high pressures, namely
between 170 to 200 bar, cylinders with diameters inferior in 20% to
the vulgarly used, that is, lighter and more economic, can still be
used for these pressures.
[0074] In this way the hydraulic pump system with integrated
distributor valve (42) can present significant reductions of the
general exterior dimensions.
[0075] The system object of the present invention, presents
efficiencies of about more 10% when compared with the conventional
systems. The data obtained from tests consist of the measuring of
the volume of oils at 1000 rpm, according to the variation of the
pressure.
[0076] The tests were carried out in a test machine of
oil-hydraulic and in a truck under working conditions. This way,
the load and unload of the trucks can be made by a platform,
quickly (in average with an economy of 10% of the time) and safely.
When in load (at 200 bar) the new equipment fastens the basculation
in 10%. There is the possibility of the pump working without any
valve in the cover (1) due to the lubrication by the channel (44)
between the shafts and the oil entrance (36) and the internal hole
in the generating power shaft (7) that protects the seal (3)
against leaks of internal pressure, which reduces the possibility
of the oil of the hydraulic circuit to pass to the exterior of the
pump in the area of the power generating shaft (10), in order to
always protect the cylinder (40) against pressure peaks.
[0077] In the compensation plate (8) a bidirectional seal can be
mounted (9), inserted in the hole along the perimeter of the
mentioned plates (8), that makes the sealing from the admission to
the pressure. The internal pressure itself helps the polymer to
seal, remaining this way in its appropriate place without risk of
rupture, because it has the capacity of eliminating the working
vibrations.
[0078] The relief valve with incorporated anti return (14) is
mounted at the exit of the pump, and has a relief valve of the
direct circuit to the cylinder (40), protecting it against pressure
peaks. The anti return hinders the return of the oil to the pump.
The pressure points of the pneumatic part are isolated from the
hydraulic pressure through connections to the oil deposit (39), for
that the risk of oil passage to the pneumatic controls is null, and
in general there will not be the necessity of end stroke valves,
being enough a relief valve (14) for discharge of the flow rate of
the pump (in not very high rotations), reducing this way the
probability of occurrence of damage.
[0079] The user turns on the power take off, which sets in motion
the hydraulic pump system with integrated distributor valve (42)
through a rotation movement.
[0080] The distributor valve (42), which is integrated in the
hydraulic pump, contains internal channels. In the hole of this
valve is mounted the distribution axle that guides the oil under
pressure through these channels to the oil deposit or to the
cylinder.
[0081] The described representation of the hydraulic pump system
with integrated valve is made as a non limitative example which can
be subjected to modifications and variations handled by an expert
person in the area, which are, however, protected under the scope
of the invention, as defined by the claims that follow.
* * * * *