EP1375821A1 - Hydrostatische Pumpenanordnung mit symmetrischer Endkappe - Google Patents

Hydrostatische Pumpenanordnung mit symmetrischer Endkappe Download PDF

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Publication number
EP1375821A1
EP1375821A1 EP03014627A EP03014627A EP1375821A1 EP 1375821 A1 EP1375821 A1 EP 1375821A1 EP 03014627 A EP03014627 A EP 03014627A EP 03014627 A EP03014627 A EP 03014627A EP 1375821 A1 EP1375821 A1 EP 1375821A1
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EP
European Patent Office
Prior art keywords
endcap
housing
pair
pump
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03014627A
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English (en)
French (fr)
Inventor
C. Paul Cox
David D. Hypes
Orville Mcdonner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tecumseh Products Co
Original Assignee
Tecumseh Products Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tecumseh Products Co filed Critical Tecumseh Products Co
Publication of EP1375821A1 publication Critical patent/EP1375821A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/22—Arrangements for enabling ready assembly or disassembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2064—Housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26—Control
    • F04B1/30—Control of machines or pumps with rotary cylinder blocks
    • F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
    • F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • F04B23/106—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type being an axial piston pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/14—Combinations of two or more pumps the pumps being of different types at least one pump being of the non-positive-displacement type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing

Definitions

  • the present invention relates to hydrostatic transmissions such as used in the lawn and garden industry on self-propelled machines such as riding lawnmowers and wide area, walk-behind lawnmowers, and in other hydrostatic pump applications.
  • Hydrostatic pump assemblies are well-known in the art, and are commonly used for conversion of rotary motion into fluid motion.
  • the pumped liquid usually an incompressible liquid such as hydraulic oil, is normally received by and drives a motor which converts the fluid motion back into a rotary motion.
  • a typical example of a hydraulic system comprising such a pump and motor is a hydrostatic transmission for driving the drive wheel(s) of a riding lawn mower.
  • the pump may be rotatably driven via a belt and pulley arrangement by the engine, and is in fluid communication with the motor via hydraulic fluid lines.
  • the output shaft of the motor is coupled to the drive wheel(s).
  • the speed at which the pump is driven is constant and the pump is of variable displacement, i.e., the quantity and direction of fluid moved thereby through the hydraulic system, and thus the speed and direction at which the motor is driven, are varied by changing the pump displacement.
  • a single pump driven by the engine may be used to drive a single motor, the latter being coupled to drive wheels through a solid axle or differential assembly.
  • Each of a pair of pumps driven by the engine may also be individually in fluid communication with one of a pair of motors, each motor respectively coupled to a single drive wheel as in a zero turn radius mower. Altering the displacements of the pumps individually controls the speed and direction of their respective motors.
  • a pump's displacement control mechanism may include a pivotable swash plate internal to the pump housing and against which the pistons of the pump, which reciprocate in cylinders provided in a barrel driven by the pump's input shaft, bear.
  • the angle of the swash plate can be variably controlled via a rotatable control shaft or trunnion arm engaged with the swash plate and to which the linkage is connected.
  • the swash plate is variably angled to adjust the stroke of the pistons, and thus the displacement of the pump.
  • Adjusting the swash plate angle such that the swash plate lies in a plane to which the pump's input shaft is substantially normal causes the pistons to have zero stroke. In this position, the transmission is in neutral, with no fluid flow being provided by the pump to the motor.
  • Rotating the swash plate about its pivot axis from its neutral position in a particular direction forces the pump to direct fluid to the motor through one of the two system lines; rotating the swash plate about its pivot axis from its neutral position in the opposite direction forces the pump to direct fluid to the motor through the other of the two system lines.
  • the direction of rotation of the motor is determined by which of the two system lines it receives high pressure fluid from the pump (the system supply line).
  • low pressure fluid is returned from the motor to the pump via the other of the two system lines (the system return line), wherein the fluid is again pumped by the pump's pistons through the system supply line to the motor for driving same.
  • the system supply and return lines are functionally interchangeable depending on which direction the swash plate is rotated about its pivot axis, the magnitude of the swash plate angle determining the speed at which the motor rotates in its forward or reverse direction.
  • Hydrostatic pump assemblies typically have a casing which includes a housing in which the pumping mechanism and displacement control means is located, and through which the swash plate control and input drive shafts extend.
  • the casing also includes an endcap which is attached to the housing and which contains fluid passages and ports by which the fluid connections to the motor and an external, low pressure fluid reservoir are made.
  • the endcap also forms a valve body containing check valves through which makeup fluid may be received from a reservoir into the fluid system, and a bypass or dump valve by which the fluid conduits to and from the motor may be placed in direct communication, the fluid thus allowed to bypass the pumping mechanism, thereby allowing the lawnmower to be pushed and the motor(s) be back-driven without tending to also back-drive the pump(s).
  • the endcap also contains a drain port through which fluid contained within the housing may be exhausted to the reservoir to prevent overpressurization of the housing.
  • Fluid pumped by the pump assembly is at a high pressure, perhaps about 2000 psig (13.8 MPa), and is directed by the system supply line to a fluid inlet of the motor.
  • the high pressure fluid received by the motor induces reciprocating movement of pistons within cylinders formed in a rotating barrel located within the housing of the motor, the barrel being rotatably fixed to the output shaft of the motor.
  • the displacement of the motor is usually fixed, the pistons bearing against a nonpivotable swash plate located within the motor housing.
  • the structure of the motor may be somewhat similar to that of the pump.
  • hydrostatic motors may be of the gerotor type, also of fixed displacement.
  • Fluid having already effected rotating motion of the motor's output shaft is expelled from the motor via a return port, and is transported at relatively low pressure, perhaps about 40 psig (276 kPa), via the system return line to the fluid return port of the pump endcap, after which it is again received by the pumping mechanism, pressurized and pumped back to the motor.
  • the supply and return lines, and their respective pump and motor ports are functionally interchanged in response to changes in the pump swash plate's being angled into a forward or reverse position relative to its neutral position. That is, in a forward swash plate position, one hydraulic line between a pump and its respective motor serves as the supply line, and in a reverse position, that same hydraulic line serves as the return line. Similarly, the second hydraulic line between that pump and motor conversely changes from a return line to a supply line.
  • An example of a known hydrostatic pump assembly is the Bantam Duty Pump (BDP) manufactured by Hydro-Gear of Sullivan, illinois, which is disclosed in U.S. Patent No. 6,332,393 (hereinafter "Trimble '393”), the disclosure of which is expressly incorporated herein by reference.
  • BDP Bantam Duty Pump
  • Trimble '393 An example of a known hydrostatic pump assembly is the Bantam Duty Pump (BDP) manufactured by Hydro-Gear of Sullivan, illinois, which is disclosed in U.S. Patent No. 6,332,393 (hereinafter "Trimble '393”), the disclosure of which is expressly incorporated herein by reference.
  • This pump assembly provides an endcap which may be assembled to the pump housing in one of two orientations, which are 180° apart about the axis of the pump's drive shaft, to provide a functionally "symmetric pump” permitting the trunnion arm to be placed on opposite sides of the pump.
  • a shortcoming of the BDP pump of Trimble '393 is that to take advantage of its functional symmetry, the endcap must be disassembled from the housing, repositioned relative thereto, and reassembled. This process may be done (e.g., by OEM or service personnel) under conditions not within the pump manufacturer's control, and may result in pump failure or fluid leaks due to misassembly.
  • Another shortcoming of the BDP pump of Trimble '393 is its lack of flexibility in bypass valve location if the pump is oriented in the vehicle based on system fluid line and linkage considerations, as is typical. Consequently, the bypass valve may not be easily accessible once the pump assembly is assembled into the vehicle.
  • a pump assembly which need not be substantially disassembled and reassembled to provide functional symmetry, perhaps by entities other than the pump manufacturer and by processes which are outside of the pump manufacturer's control, would better ensure pump and system quality and reliability, and would be a desirable improvement over the prior art.
  • a pump assembly having functional symmetry and which also provides flexibility regarding the location of its bypass valve, therefore affording possibly easier access to it once the pump has been installed in the vehicle, would also be a desirable advantage over the prior art.
  • the present invention overcomes the above mentioned shortcomings of previous hydrostatic pump assemblies, and provides desired improvements and advantages thereover.
  • the present invention provides the flexibility of locating the bypass valve and the individual system fluid lines in, e.g., either of two lateral sides of the endcap, and the casing drain in either of two lateral sides of the housing.
  • the bypass valve and the individual system fluid lines are located in either of two opposite lateral sides of the endcap and the casing drain is provided in either of two opposite lateral sides of the housing, thereby providing a functional symmetry which allows the inventive pump to be packaged in a vehicle more easily and which accommodates simpler fluid line routings and control linkage designs than previously achievable.
  • the present invention does so without requiring the endcap to be disassembled, reoriented and reassembled to the pump housing, thereby better assuring pump and system reliability.
  • the invention in one form thereof comprises an endcap for a hydrostatic pump.
  • the endcap of this form of the present invention includes an endcap housing and a pair of system passages formed in the endcap housing and fluidly connected to the hydrostatic pump. Each of the pair of system passages spans a pair of system passage sides of the endcap housing.
  • the invention in another form thereof, comprises an endcap for a hydrostatic pump.
  • the endcap of this form of the present invention includes an endcap housing and system passage means for providing a pair of fluid accesses to the hydrostatic pump from a pair of system passage sides of the endcap housing.
  • the invention in yet another form thereof, comprises an endcap for a hydrostatic pump.
  • the endcap of this form of the present invention includes an endcap housing having a pair of system passages formed therein. Each of the system passages is fluidly connected to the hydrostatic pump.
  • the endcap of this form of the present invention further includes a bypass passage fluidly connecting a pair of system passages.
  • the bypass passage includes a first end and a second end each of which forms a valve seat.
  • the present invention provides a hydrostatic pump assembly having a casing which encloses a pumping mechanism, and including a housing, and an endcap attached to the housing.
  • the endcap has at least one lateral exterior surface, and a first system fluid passage having a pair of system ports located opposite each other in the endcap lateral exterior surface, and a second system fluid passage having a pair of system ports located opposite each other in the endcap lateral exterior surface, each of the first and second system fluid passages being in fluid communication with the pumping mechanism.
  • the present invention provides a hydrostatic pump assembly having an endcap provided with a bypass passage extending between first and second system fluid passages, the bypass passage being in communication with a pair of bypass valve holes located, e.g., opposite each other in the endcap's lateral exterior surface.
  • a bypass valve is located in one of, and is interchangeable between, the pair of bypass valve holes, and a removable plug is located in the other of the bypass valve holes.
  • the bypass passage is selectively opened and closed by the bypass valve, whereby the first and second system fluid passages may be placed in and out of direct fluid communication with each other through the bypass passage.
  • the present invention also provides a hydrostatic,pump assembly provided with a pair of selectively closeable case drains located opposite each other in its housing.
  • the inventive pump assembly thereby provides functional symmetry by which flexibility of pump orientation and hydrostatic fluid lines is improved vis-à-vis previous hydraulic pump assemblies. Furthermore, in accordance with the present invention, functional symmetry is provided without necessitating that the pump assembly be substantially disassembled and reassembled by entities and processes beyond the control of the pump manufacturer, thereby promoting pump and system reliability.
  • Figure 1 is a perspective view of the inventive pump assembly
  • Figure 2 is a perspective view of the inventive pump assembly
  • Figure 3 is an enlarged cutaway view of the inventive pump assembly, showing a portion of its endcap interior;
  • Figure 4 is a partial, enlarged cutaway view of the inventive pump assembly, showing a portion of its endcap interior;
  • Figure 5 is a partial, enlarged cutaway view of the inventive pump assembly, showing portions of the endcap and housing interiors, excluding the pumping mechanism within the housing;
  • Figure 6 is a partial, enlarged cutaway view of the inventive pump assembly, showing portions of the endcap and housing interiors, excluding the pumping mechanism within the housing;
  • Figure 7 is a first side view of the inventive pump assembly
  • Figure 8 is a second side view of the inventive pump assembly, showing a first pair of system ports and a first housing drain port;
  • Figure 9 is a third side view of the inventive pump assembly
  • Figure 10 is a fourth side view of the inventive pump assembly, showing a second pair of system ports and second housing drain port;
  • Figure 11 is a rear view of the inventive pump assembly as seen from line 11-11 of Figure 9;
  • Figure 12 is a sectional view of the inventive pump assembly along line 12-12 of Figure 11, excluding the pumping mechanism within the housing;
  • Figure 13 is a sectional view of the inventive pump assembly along line 13-13 of Figure 8.
  • Figure 14 is a sectional view of the endcap of the inventive pump assembly showing the bypass or dump valve in a first orientation
  • Figure 15 is a sectional view of the endcap of Figure 14 showing the bypass or dump valve in a second orientation.
  • Pump assembly 20 includes casing 22 comprised of housing'24 and endcap 26. Disposed within housing 24 is a pumping mechanism including a rotating cylinder block within which are provided a plurality of circumferentially distributed cylinders, each having spring-loaded, reciprocating pistons positioned therein. The displacement of the pump assembly is varied by altering the stroke of these pistons through means of pivoting a swash plate against which one end of the pistons bear through a thrust bearing.
  • Endcap 26 is attached to housing 24 by bolts 28 which extend through bolt holes 30 (see, e.g., Figures 3 and 4) provided in the four comers of endcap 26.
  • Endcap 26 has the general shape of a parallelepiped having an exterior surface comprised of four connected lateral sides, and two opposite end faces, one of which is an exterior endface located opposite the housing, the other of which is an interior endface located inside the housing.
  • the end face located inside the housing has a planar surface thereon against which the rotating cylinder block slidably abuts, this surface being provided with a pair of arcuate openings through which fluid is received into or discharged by the pumping mechanism.
  • charge pump 33 Attached to the exterior face of endcap 26 is cover 32 for charge pump 33 (see, e.g., Figure 3).
  • Cover 32 is attached to endcap 26 by means of bolts 34 as shown, e.g., in Figure 11.
  • charge pump 33 includes gerotor impeller 36 located within cover 32 and rotatably coupled to pump drive shaft 38. Shaft 38 extends through housing 24, the rotating cylinder block of the pumping mechanism therein, and endcap 26.
  • Charge pump 33 also includes gerotor follower 40 rotatably supported by cover 32 and which is drivingly enmeshed with impeller 36.
  • Charge pump 33 pumps makeup fluid from a reservoir (not shown) external to pump assembly 20 to the hydrostatic system, as described further herein below.
  • housing 24 Extending laterally through the side of housing 24 is swash plate angle control shaft or trunnion arm 42, which is rotatably manipulated through a linkage (not shown) by an operator for altering the displacement of the pumping mechanism within housing 24 as discussed above.
  • case drains 44 ( Figure 1) and 46 ( Figure 2) are also provided on the lateral sides of housing 24, either of which may be sealed with threaded plug 48, the other of which is provided with a fitting (not shown) for a conduit through which hydraulic fluid expelled through the case drain may be directed to the fluid reservoir.
  • Endcap 26 is assembled to the housing in a single, common orientation at the pump manufacturer's assembly facility, and need not be later disassembled from, reoriented, and reassembled to the housing to realize the functional symmetry of pump assembly 20.
  • the inventive pump may be provided to an OEM or service provider under a single part number, thereby simplifying inventorying and other administrative functions associated with vehicle manufacturing or servicing.
  • One lateral side of endcap 26 is provided with system port 50 for circuit side A and system port 52 for circuit side B, circuit sides A and B alternately serving as the supply and return circuits for the hydrostatic system depending on whether the swash plate is adjusted to its forward or reverse position.
  • system port 50 for circuit side A
  • system port 52 for circuit side B
  • circuit sides A and B alternately serving as the supply and return circuits for the hydrostatic system depending on whether the swash plate is adjusted to its forward or reverse position.
  • oil supply port 54 Disposed between ports 50 and 52 is oil supply port 54 which is provided with a fitting (not shown) for a conduit through which oil is received from the reservoir and supplied to the hydrostatic system through check valves, as described further below.
  • system port 56 for circuit side A On the opposite lateral side of endcap 26 are also located system port 56 for circuit side A, and system port 58 for circuit side B.
  • system ports 50 and 56 for circuit side A are in direct communication with each other and are located at opposite ends of a bore extending through endcap 26.
  • system ports 52 and 58 for circuit side B are also aligned with each other at opposite ends of a bore extending through endcap 26.
  • Disposed between system port 56 and system port 58 is makeup fluid bore 60 which extends laterally into endcap 26 and is plugged with threaded plug 62.
  • check valve holes 64 and 66 which are axially aligned with one another, and within which are respectively disposed check valve assemblies 68 and 70.
  • check valve assemblies 68 and 70 are biased by springs into a closed position which prevents fluid from either circuit side A or B from entering bore 60.
  • Makeup fluid pumped by charge pump 33 is forced into bore 60, and acts against check valves 68 and 70.
  • the respective check valve is moved off of its seat and makeup fluid flows from bore 60 to that circuit side, as is known in the art.
  • Adjacent check valve holes 64 and 66 in the respective lateral sides of endcap 26 are located bypass valve holes 72 and 74. As shown, these bypass valve holes are also axially aligned, and one is provided with bypass valve 76. The other bypass valve hole is sealed with threaded plug 78. As discussed further herein below, OEM or service personal may simply interchange bypass valve 76 and plug 78 as necessary to afford easy access to the bypass valve when pump assembly 20 is installed in the vehicle.
  • system ports 50 and 56 are located at opposite ends of A-side system passage 80, and system ports 52 and 58 are located at opposite ends of B-side system passage 82.
  • pump passage 84 which extends toward the surface of endcap 26 against which the cylinder block slidably abuts, pump passage 84 opening into one of the two above-mentioned arcuate openings through which fluid is received or expelled from the cylinders of the cylinder block.
  • pump passage 86 located substantially centrally along system passage 82 is pump passage 86 which is in communication with the other arcuate passage in the cylinder-abutting surface of the endcap.
  • A-side and B-side system passages 80 and 82 are in selective fluid communication with each other through bypass passage 88, which is provided with seats 90 at its opposite ends, one of seats 90 interfacing with the tip of bypass valve 76 to close communication . between system passages 80 and 82.
  • bypass valve 76 When bypass valve 76 is disengaged from seat 90, system passages 80 and 82 are placed in fluid communication via bypass passage 88. Fluid being pumped into one of system passages 80 and 82 by, for example, a back-driven hydrostatic system motor, will then be directed through bypass passage 88 to the other system passage, thereby allowing that fluid to bypass the pumping mechanism.
  • pump input shaft may be in constant engagement with the engine output shaft through a belt drive, which would inhibit reverse rotation of the pump. Disengagement of bypass valve 76 from its seat 90 thus allows the vehicle to be easily pushed.
  • Hydrostatic fluid supply and return lines between pump assembly 20 and its associated motor may be fitted into either of ports 50 and 56 for the A-side circuit, and likewise into either of ports 52 and 58 for the B-side circuit.
  • the A-side and B-side system ports which are not being used for conveyance of fluid to and from pump assembly 20 may be sealed with threaded plugs (not shown). In this manner, simplicity of system line and control linkage packaging is accommodated.
  • inventive pump assembly 20 provides a functional symmetry which allows the inventive pump to be packaged in a vehicle more easily and which accommodates simpler fluid line routings and control linkage designs than previously achievable. Moreover, the present invention does so without requiring the endcap to be disassembled, reoriented and reassembled to the pump housing, thereby better assuring pump and system reliability.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP03014627A 2002-06-28 2003-06-26 Hydrostatische Pumpenanordnung mit symmetrischer Endkappe Withdrawn EP1375821A1 (de)

Applications Claiming Priority (2)

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US39240102P 2002-06-28 2002-06-28
US392401P 2002-06-28

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Cited By (1)

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EP3098446A1 (de) * 2015-05-29 2016-11-30 Kanzaki Kokyukoki Mfg. Co., Ltd. Hydraulikpumpe

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US8796875B2 (en) 2012-11-20 2014-08-05 Turbogen, Llc Housing apparatus for use with an electrical system and method of using same
US8907512B2 (en) 2012-11-20 2014-12-09 Turbogen, Llc Load apparatus and method of using same
DE102017203281A1 (de) * 2017-03-01 2018-09-06 Robert Bosch Gmbh Anschlussplatte, Hydromaschine mit Anschlussplatte, sowie hydrostatische Einheit mit Hydromaschine und hydraulischem Anbauteil

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CN106194704A (zh) * 2015-05-29 2016-12-07 株式会社神崎高级工机制作所 液压泵
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