WO2015104530A1 - Ensemble pompe à rotors dentés, système de distribution de fluide moteur utilisant un ensemble pompe à rotors dentés et composants divers associés - Google Patents

Ensemble pompe à rotors dentés, système de distribution de fluide moteur utilisant un ensemble pompe à rotors dentés et composants divers associés Download PDF

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Publication number
WO2015104530A1
WO2015104530A1 PCT/GB2014/053806 GB2014053806W WO2015104530A1 WO 2015104530 A1 WO2015104530 A1 WO 2015104530A1 GB 2014053806 W GB2014053806 W GB 2014053806W WO 2015104530 A1 WO2015104530 A1 WO 2015104530A1
Authority
WO
WIPO (PCT)
Prior art keywords
gerotor
pump housing
relief valve
pump
compression portion
Prior art date
Application number
PCT/GB2014/053806
Other languages
English (en)
Inventor
Richard Ford
Carlo BOVENZI
Original Assignee
Perkins Engines Company Limited
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 Perkins Engines Company Limited filed Critical Perkins Engines Company Limited
Publication of WO2015104530A1 publication Critical patent/WO2015104530A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0088—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/086—Carter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/088—Elements in the toothed wheels or the carter for relieving the pressure of fluid imprisoned in the zones of engagement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/60—Shafts
    • F04C2240/603—Shafts with internal channels for fluid distribution, e.g. hollow shaft

Definitions

  • the present disclosure generally relates to a gerotor pump assembly, an engine fluid delivery system using a gerotor pump assembly and miscellaneous components therefor.
  • Gerotor type hydraulic pumps typically include an internally toothed outer gerotor and an externally toothed inner gerotor disposed in a pump housing.
  • the teeth on the respective gerotors cooperate to define a plurality of variable volume chambers.
  • a variable volume chamber will initially increase in volume to create a low pressure or suction area, and subsequently decrease in volume to create a high pressure or compression area.
  • An inlet port communicates with the low pressure area so that fluid in the inlet port is drawn into the variable volume chamber.
  • the variable volume chamber decreases in volume, the fluid is discharged through an outlet port at an elevated pressure.
  • a relief valve may be used to reduce fluid overpressure.
  • a gerotor pump assembly comprising: a pump housing defining a suction portion and a compression portion; a pump outlet in fluid communication with the compression portion of the pump housing; and a gerotor rotatably disposed within the pump housing and defining a gerotor front face, a gerotor rear face and a gerotor side wall; the gerotor comprising an outer gerotor and an inner gerotor, with the inner gerotor operably engaging the outer gerotor to define a plurality of variable volume chambers, wherein during rotation of the inner and outer gerotors the variable volume chambers located in the suction portion of the pump housing increase in volume and the variable volume chambers located in the compression portion of the pump housing decrease in volume; wherein the compression portion of the pump housing extends into fluid communication with both the gerotor front face and the gerotor rear face to allow, in use, exit of an engine fluid from the variable volume chambers via both the gerotor front face and the gerotor rear face
  • valve element for a relief valve of a gerotor pump assembly comprising a valve element inlet at a first end and one or more valve element outlets located in a side wall of the valve element; wherein the side wall of the valve element further comprises a circumferential groove located at a point along the side wall to at least partially coincide with the one or more valve element outlets.
  • a relief valve for a gerotor pump assembly comprising: a relief valve housing defining a relief valve inlet and a relief valve outlet; a valve element as described above in the previous aspect which is movable within the relief valve housing between closed and open configurations to control transmission, in use, of an engine fluid through the relief valve assembly; and a resilient member for biasing the valve element into the closed configuration.
  • a gerotor pump assembly and a relief valve.
  • a gerotor pump assembly comprising: a pump housing defining a suction portion and a compression portion; a pump outlet in fluid communication with the compression portion of the pump housing; a gerotor rotatably disposed within the pump housing; and a relief valve assembly in fluid communication with the compression portion of the pump housing; the gerotor comprising an outer gerotor and an inner gerotor, with the inner gerotor operably engaging the outer gerotor to define a plurality of variable volume chambers, wherein during rotation of the inner and outer gerotors the variable volume chambers located in the suction portion of the pump housing increase in volume and the variable volume chambers located in the compression portion of the pump housing decrease in volume; the relief valve assembly comprising: a relief valve housing defining a relief valve inlet and a relief valve outlet; and a valve element movable within the relief valve housing between closed and open configurations to control transmission, in use, of an engine fluid through the relief valve assembly; wherein the relief valve inlet directly communicates with the compression portion
  • a gerotor pump assembly comprising: a pump housing defining a suction portion and a compression portion; a pump inlet in fluid communication with the suction portion of the pump housing; a pump outlet in fluid communication with the compression portion of the pump housing; and a gerotor rotatably disposed within the pump housing; the gerotor comprising an outer gerotor and an inner gerotor, with the inner gerotor operably engaging the outer gerotor to define a plurality of variable volume chambers, wherein during rotation of the inner and outer gerotors the variable volume chambers located in the suction portion of the pump housing increase in volume and the variable volume chambers located in the
  • suction portion of the pump housing decrease in volume; wherein the suction portion of the pump housing defines a suction cavity which provides fluid communication between the pump inlet and the variable volume chambers as the gerotor rotates within the pump housing; wherein the suction cavity extends through an angle greater than 140° about the rotational axis of the outer gerotor
  • a gear shaft for an idle gear of a gerotor pump assembly comprising a cylindrical shaft having a head at one end defined by an outwardly extending flange; the cylindrical shaft comprising: a circumferential oil entry groove arranged in a surface of the cylindrical shaft; an oil outlet port arranged in the surface of the cylindrical shaft at a distance from the circumferential oil entry groove; and an oil transmission conduit extending internally through the cylindrical shaft and providing fluid communication from the circumferential oil entry groove to the oil outlet port.
  • an idle gear for a gerotor pump assembly comprising a toothed idle gear wheel rotatably mounted on a gear shaft as described above in the previous aspect.
  • an engine fluid delivery system for a machine comprising: a sump for holding an engine fluid; a gerotor pump assembly as described above in the previous aspects; and a suction pipe for fluid communication between the sump and the gerotor pump assembly.
  • Figure 1 shows a perspective view of a gerotor pump assembly according to the present disclosure
  • Figure 2 is an exploded perspective view of the gerotor pump assembly of Figure
  • Figure 3 is a cross-sectional view of the gerotor pump assembly of Figure 1 ;
  • Figure 4 is an end elevation of the of the gerotor pump assembly of Figure 1 with certain components omitted for clarity;
  • Figure 5 is an end elevation as shown in Figure 4 but with further components omitted for clarity;
  • Figure 6 is a perspective view of a valve element of the gerotor pump assembly of Figure 1 ;
  • Figure 7 is an enlarged view of a portion of the valve element of Figure 6;
  • Figure 8 is a cross-sectional view through a relief valve assembly of the gerotor pump assembly of Figure 1 in a closed configuration
  • Figure 9 is a cross-sectional view through the relief valve assembly of Figure 8 in an open configuration
  • Figure 10 is a cross-sectional view through certain gear train components of the gerotor pump assembly of Figure 1 ;
  • Figure 1 1 is a perspective view of an idle gear shaft of the gerotor pump assembly of Figure 1 ;
  • Figure 12 is a cross-sectional view through the idle gear shaft of Figure 1 1 ; and Figure 13 is a perspective view through a portion of the gerotor pump assembly of Figure 1 with hidden detail shown.
  • An embodiment of a gerotor pump assembly is disclosed for use in an engine fluid delivery system.
  • the engine fluid delivery system is described herein as an engine oil pump system, however it will be appreciated that the gerotor pump assembly may be used to deliver fuel or other types of fluids to the engine. Additionally, the engine fluid delivery system may be used on any type of machine, stationary or mobile, that requires a circulating fluid.
  • the engine oil pump system may typically in use be coupled to an engine and may comprise the gerotor pump assembly so configured to retrieve oil from a sump and deliver it to the engine at an elevated pressure.
  • Figures 1 and 2 illustrate a gerotor pump assembly 1 which may be used in such a manner.
  • the gerotor pump assembly 1 comprises a pump inlet 2 and a pump outlet 3.
  • a suction tube of the engine oil pump system may be coupled to the pump inlet 2.
  • the gerotor pump assembly 1 is operable to draw oil from the sump through the suction tube and discharge it through the pump outlet 3 at an elevated pressure.
  • the gerotor pump assembly 1 includes a pump housing 4 which may be formed from one or more castings. As shown in Figure 3, the pump housing 4 defines a pumping section 1 0 having a suction portion 5 defining a suction cavity 40 and a compression portion 6 defining a compression cavity 41 which may be at one end of the pump housing 4.
  • the pump housing 4 may include one or more conduits for transferring oil to and from the pumping section 10.
  • the pump housing 4 may comprise an inlet conduit 7 fluidly linking the pump inlet 2 to the suction portion 5, an outlet conduit 8 fluidly linking the compression portion 6 to the pump outlet 3, and a relief valve conduit 9, the function of which will be described further below.
  • the pump inlet 2 and the pump outlet 3 may be located at an end of the pump housing 4 opposite the pumping section 1 0.
  • the gerotor pump assembly 1 further includes within the pumping section 10 a gerotor formed from an outer gerotor 1 1 and an inner gerotor 1 2 for generating a pressure differential within the pump housing 4.
  • the outer gerotor 1 1 has inwardly extending teeth 1 3, while the inner gerotor 1 2 has outwardly extending teeth 14 that operably engage the inwardly extending teeth 1 3 of the outer gerotor 1 1 .
  • the outer gerotor 1 1 is supported for rotation about a first axis 15, while inner gerotor 1 2 is supported for rotation about a second axis 1 6 that is spaced from the first axis 15 to effect a gear eccentricity that permits proper operation of the gerotor pump assembly 1 .
  • the inner gerotor 12 may have one less tooth than the outer gerotor 1 1 .
  • a plurality of variable volume chambers 20 are defined between engaged pairs of inwardly extending teeth 13 and outwardly extending teeth 14.
  • a variable volume chamber 20 will increase in volume as it travels through the suction portion 5 of the pumping section 10, thereby to produce a relatively low pressure that draws fluid into the variable volume chambers 20.
  • the variable volume chamber 20 will decrease in volume as it travels through the
  • the compression portion 6 of the pump housing 4 extends into fluid communication with both a gerotor front face 31 and a gerotor rear face 32 of the gerotor to allow, in use, exit of oil from the variable volume chambers 20 via both the gerotor front face 31 and the gerotor rear face 32.
  • the gerotor front face 31 may be spaced from a front wall 34 of the compression portion 6 of the pump housing 4 and the gerotor rear face 32 may be spaced from a rear wall 35 of the compression portion 6 of the pump housing 4.
  • a gerotor side wall 33 of the outer gerotor 1 1 may be spaced from a side wall 36 of the compression portion 6 of the pump housing 4.
  • the compression cavity 41 of the compression portion 6 of the pumping section 10 may extend in a contiguous manner around the front, side and rear of the gerotor.
  • suction portion 5 of the pump housing 4 may extend into fluid
  • the gerotor front face 31 may be spaced from a front wall 37 of the suction portion 5 of the pump housing 4 and the gerotor rear face 32 may be spaced from a rear wall 38 of the suction portion 5 of the pump housing 4.
  • the gerotor side wall 33 may be spaced from a side wall 39 of the suction portion 5 of the pump housing 4.
  • the suction cavity 40 of the suction portion 5 of the pumping section 10 may extend in a contiguous manner around the front, side and rear of the gerotor.
  • the suction cavity 40 may extend through an angle a greater than 140 ° about the first axis 15 about wHch the outer gerotor 1 1 rotates.
  • the suction cavity 40 extends through an angle a greater than 1 50 ° about the first axis 15.
  • the suction cavity 40 may encompass greater than 140 ° , optionally greater than 1 50 ° , ofthe 360 ° circumferential extent of the pumping chamber 10.
  • the suction cavity 40 may comprise an arcuate portion 50 which is curved about the first axis 1 5.
  • the arcuate portion 50 may comprise a first end 51 which has a bicuspid shape.
  • first end 51 having a bicuspid shape may comprise a first tongue section 52 and a second tongue section 53.
  • the second tongue section 53 may be elongated relative to the first tongue section 52.
  • the first tongue section 52 and/or the second tongue section 53 may be shallower than a remainder of the arcuate portion 50 of the suction cavity 40.
  • the gerotor pump assembly 1 may comprise a relief valve assembly 60 in fluid communication with the compression portion 6 of the pump housing 4.
  • the relief valve assembly 60 may comprise a relief valve housing 61 defining a relief valve inlet 62 and a relief valve outlet 63.
  • a valve element 64 may be movable within the relief valve housing 61 between closed and open configurations to control transmission, in use, of oil through the relief valve assembly 60.
  • a resilient member 66 may be provided for biasing the valve element 64 into the closed configuration.
  • a helical spring may be provided extending between the valve element 64 and an end cap 67 which may close off one end of the relief valve housing 61 .
  • the relief valve inlet 62 may directly communicate with the compression portion 6 of the pump housing 4.
  • the relief valve inlet 62 may be fluidly linked to the compression cavity 41 of the compression portion 6 by the relief valve conduit 9.
  • the compression portion 6 of the pump housing 4 may comprise a first compression portion outlet 70 providing fluid communication from the compression portion 6 to the pump outlet 3 and a second compression portion outlet 71 providing fluid communication from the compression portion 6 to the relief valve conduit 9 and relief valve inlet 62.
  • the second compression portion outlet 71 may communicate solely with the relief valve inlet
  • the fluid communication to the relief valve assembly 60 may not be via a portion of the outlet conduit 8 taking fluid flow towards the pump outlet 3.
  • the second compression portion outlet 71 may be provided in the rear wall 35 of the compression portion 6 of the pump housing 4.
  • the second compression portion outlet 71 may be located in the rear wall 35 of the compression portion 6 of the pump housing 4 at a location at least partially over-swept by the rotating gerotor.
  • the relief valve conduit 9 between the compression portion 6 of the pump housing 4 and the relief valve inlet 62 may be devoid of any bends having an angular deviation of greater than 30 ° .
  • compression cavity 41 to the relief valve assembly 60 may be provided.
  • the relief valve outlet 63 may fluidly communicate with the suction portion 5 of the pump housing 4. For example, this may be via a bypass conduit 1 7 which may lead from the relief valve outlet 63 to join part-way along the inlet conduit 7.
  • valve element 64 may comprise a valve body 81 having a valve element inlet 89 at a first end and one or more valve element outlets 84 located in a side wall 90 of the valve body 81 .
  • a boss 82 may be provided at an opposite end from the valve element inlet 89 to serve as a mounting for one end of the resilient member 66.
  • the valve body 81 may be tubular and the one or more valve element outlets 84 may comprise a plurality, preferably four, radially- orientated apertures in the side wall 90 of the valve element 64.
  • the side wall 90 of the valve element 64 may further comprise a circumferential groove 83 located at a point along the side wall 90 to at least partially coincide with the one or more valve element outlets 84.
  • the circumferential groove 83 may define a front lip 85 that may be aligned at, or in front of, a foremost longitudinal position of the one or more valve element outlets 84.
  • the circumferential groove 83 may define a rear lip 86 that may be aligned within the longitudinal extent of the one or more valve element outlets 84.
  • a forward portion of the circumferential groove 83 at or near the front lip 85 may be provided with a chamfer 87, which may be angled at 45 ° to a longitudinal axis of the valve element 64.
  • the rear lip 86 may be provided with a radiused filet 88.
  • valve element 64 is located within the relief valve housing 61 such that the valve element outlets 84 are sealed against an inner face of a narrowed bore 92 of the relief valve housing 61 .
  • the valve element 64 may slide into the open configuration of Figure 9 wherein the valve element outlets 84 have moved into an enlarged bore 93 of the relief valve housing 61 such that fluid communication is established from the relief valve inlet 62 to the relief valve outlet 63 via the valve body 81 and the valve element outlets 84 and
  • the valve element 64 may return to the closed configuration.
  • the circumferential groove 83 may retain oil which may lubricate movement of the valve element 64 within the narrowed bore 92.
  • the gerotor pump assembly 1 may further comprise one or more gear train components.
  • the pump housing 4 may be provided with a toothed gerotor drive gear 1 00 and an idle gear 1 01 .
  • the toothed gerotor drive gear 100 and the idle gear 101 may be rotatably mounted within apertures of a pump housing cover 102 which may form a part of the pump housing 4.
  • the idle gear 101 may comprise a toothed idle gear wheel 103 which may be rotatably mounted on a gear shaft 1 04 as shown in detail in Figures 1 0 to 13.
  • a bushing 105 may be interposed between the gear shaft 1 04 and the toothed idle gear wheel 1 03.
  • the gear shaft 104 may comprise a cylindrical shaft 1 06 having a head 1 07 at one end defined by an outwardly extending flange 1 08.
  • the cylindrical shaft 1 06 may comprise a circumferential oil entry groove 109 arranged in a surface 1 10 of the cylindrical shaft, an oil outlet port 1 1 1 arranged in the surface 1 1 0 of the cylindrical shaft at a distance from the circumferential oil entry groove, and an oil transmission conduit 1 12 extending internally through the cylindrical shaft 1 06 and providing fluid communication from the circumferential oil entry groove 109 to the oil outlet port 1 1 1 .
  • the circumferential oil entry groove 109 may be located distal the head 107 and the oil outlet port 1 1 1 may be located proximal the head 107.
  • the oil transmission conduit 1 1 2 may be defined by a straight, diagonally-orientated conduit. When assembled, the bushing 105 may overlie the oil outlet port 1 1 1 of the gear shaft
  • the present disclosure is applicable to machines that include a gerotor pump assembly to deliver an engine fluid to an engine.
  • the gerotor pump assembly may provide oil, fuel, or other engine fluid needed by the engine.
  • the engine may be provided on a mobile or stationary machine. Where the engine fluid is oil the gerotor pump assembly may provide oil to support hydrostatic bearings and lubricated moving parts of the engine.
  • a gerotor pump assembly 1 wherein, in use, an engine fluid may exit from the variable volume chambers 20 via both the gerotor front face 31 and the gerotor rear face 32.
  • This may permit a more balanced axial force loading on the gerotor during use since both the gerotor front face 31 and the gerotor rear face 32 are exposed to the same fluid pressure as opposed to having one face of the gerotor exposed to a different pressure level.
  • the more balanced axial force loading may allow for smoother operation of the gerotor pump assembly 1 and reduced wear of the gerotor front and rear faces.
  • the increased number of points of exit for the engine fluid from the gerotor, in both the gerotor front face 31 and the gerotor rear face 32 may result in a smoothing of pressure fluctuations in the delivered engine fluid.
  • the suction cavity 40 may extend through an angle a greater than 140 ° .
  • the increased angular length of the suction cavity 40 permits for easier engine fluid entry into the variable volume chambers 20. This is particularly advantageous when the gerotor is rotating at high speeds since it allows for a longer period for the engine oil to enter the variable volume chambers 20 as the teeth of the outer gerotor 1 1 and the inner gerotor are moving apart. This may help to reduce cavitation within the gerotor.
  • the relief valve assembly 60 directly communicates with the compression portion 6 of the pump housing 4.
  • the second compression portion outlet 71 that leads to the relief valve assembly 60 may be located in the rear wall 35 of the compression portion 6 of the pump housing 4 at a location at least partially over-swept by the rotating gerotor. In this way, pressure fluctuations may be reduced, and pressure rises, produced by the rotating gerotor, may be more directly transmitted to the relief valve assembly 60. This may result in a faster and more accurate response of the relief valve assembly 60. Further, a straight or relatively straight path for the engine fluid from the compression cavity 41 to the relief valve assembly 60 may be provided. Again, this may result in a faster and more accurate response of the relief valve assembly 60.
  • circumferential groove 83 and chamfer 87 of the valve element 64 may help to reduce pressure fluctuations and jamming of the relief valve assembly 60 by providing a more gradual increase in the open flow area of the relief valve assembly 60 during opening.
  • oil which may be retained in the circumferential groove 83 can lubricate movement of the valve element 64 within the narrowed bore 92 which may allow for a smoother operation of the relief valve assembly 60 and reduced component wear.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Rotary Pumps (AREA)

Abstract

L'invention concerne un ensemble pompe à rotors dentés (1) comprenant une zone de compression (6) d'une section de pompage (10) communiquant de manière fluidique avec la face avant (31) du rotor denté et la face arrière (32) du rotor denté pour permettre, en utilisation, à un fluide moteur de sortir de chambres à volume variable (20) du rotor denté par la face avant (31) du rotor denté et la face arrière (32) du rotor denté. Un ensemble vanne de décompression (60) associé comporte un orifice d'entrée de décharge (62) communiquant directement avec la zone de compression (6) de la section de pompage (10). L'invention concerne également un système de distribution de fluide moteur et divers composants tels qu'un élément de vanne de décompression (64) et une tige d'engrenage (104) utilisés avec l'ensemble pompe à rotors dentés (1).
PCT/GB2014/053806 2014-01-07 2014-12-19 Ensemble pompe à rotors dentés, système de distribution de fluide moteur utilisant un ensemble pompe à rotors dentés et composants divers associés WO2015104530A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1400229.9 2014-01-07
GB1400229.9A GB2521874A (en) 2014-01-07 2014-01-07 Gerotor pump assembly, an engine fluid delivery system using a gerotor pump assembly and miscellaneous components

Publications (1)

Publication Number Publication Date
WO2015104530A1 true WO2015104530A1 (fr) 2015-07-16

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PCT/GB2014/053806 WO2015104530A1 (fr) 2014-01-07 2014-12-19 Ensemble pompe à rotors dentés, système de distribution de fluide moteur utilisant un ensemble pompe à rotors dentés et composants divers associés

Country Status (2)

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GB (1) GB2521874A (fr)
WO (1) WO2015104530A1 (fr)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN106050650A (zh) * 2016-07-19 2016-10-26 珠海格力电器股份有限公司 齿轮泵及其旁通油路结构
CN114294071A (zh) * 2022-01-08 2022-04-08 湖南机油泵股份有限公司 一种商用车全可变排量机油泵

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EP0345978A1 (fr) * 1988-06-09 1989-12-13 Concentric Pumps Limited Pompe à engrènement interne
US6106240A (en) * 1998-04-27 2000-08-22 General Motors Corporation Gerotor pump

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CN114294071A (zh) * 2022-01-08 2022-04-08 湖南机油泵股份有限公司 一种商用车全可变排量机油泵
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