US20160369796A1 - Integrated Motor-Pump - Google Patents
Integrated Motor-Pump Download PDFInfo
- Publication number
- US20160369796A1 US20160369796A1 US15/187,085 US201615187085A US2016369796A1 US 20160369796 A1 US20160369796 A1 US 20160369796A1 US 201615187085 A US201615187085 A US 201615187085A US 2016369796 A1 US2016369796 A1 US 2016369796A1
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- United States
- Prior art keywords
- pump
- motor
- retainer ring
- gerotor
- shaft
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- Abandoned
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- 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
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
- F04C15/008—Prime movers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/007—General arrangements of parts; Frames and supporting elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/02—Arrangements of bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/10—Outer members for co-operation with rotary pistons; Casings
-
- 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
- F04C2/086—Carter
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- 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
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- 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
- F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
- F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
- F04C2/3441—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
- F04C2/3445—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation the vanes having the form of rollers, slippers or the like
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- 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
- F04C2230/00—Manufacture
- F04C2230/60—Assembly methods
- F04C2230/603—Centering; Aligning
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- 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
- F04C2240/20—Rotors
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- 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
- F04C2240/30—Casings or housings
-
- 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
- F04C2240/50—Bearings
- F04C2240/56—Bearing bushings or details thereof
-
- 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
Definitions
- This disclosure relates to compact configurations for combining a pump stage with a motor.
- Compact motor-driven pumps are commonly employed to deliver fuel, lubricants, hydraulic or other fluids in equipment, land and water vehicles and aircraft.
- the pumps and motors are commonly manufactured separately and then assembled into the same housing, which may also serve as a conduit for fluid being pumped.
- the fluid being pumped may circulate through the motor to lubricate and cool the motor and electronics associated with a brushless motor configuration.
- roller vane, gerotor and turbine pump stages are commonly employed in such assemblies, with the pump stage selected based on the characteristics of the fluid being pumped and the pressure and volume of fluid flow required by the system.
- the pump stage typically includes three components that define a pumping chamber.
- An inlet plate defines one or more arcuate inlet ports for fluid to enter the pumping chamber and defines one axial side of the pumping chamber.
- An outlet plate defines one or more arcuate outlet ports and defines the opposite axial side of the pumping chamber.
- a retainer ring is sandwiched between the inlet and outlet plates and defines the radial, inside surface of the pumping chamber.
- the inside surface of the pumping chamber is defined by a circle eccentric from the center (rotational) axis of the motor and pump.
- the position of the inlet and outlet ports, in combination with eccentrically rotating roller vane or gerotor pump components, result in differential pressures in the pump chamber that force fluid through the pump from the inlet to the outlet. Pumped fluid may be directed through the motor for the purpose of cooling and lubrication.
- gerotor pumps With respect to gerotor pumps in particular, the geometry and alignment of pump components is critical to smooth and reliable pump operation.
- One important relationship is the rotational axis of the inner gerotor and rotational axis of the motor shaft, which are preferably concentric (as close to the same axis as possible).
- Most gerotor pumps employ separately manufactured inlet and outlet plates axially spaced by the retainer ring. Separately manufactured parts must be tightly tolerance to prevent tolerance stack up issues that will interfere with proper gerotor pump operation. Further, the separate components must be carefully aligned during assembly to ensure a concentric relationship between the motor shaft, the inner gerotor and the eccentric path of the outer gerotor.
- Alignment is typically accomplished by pins or fasteners extending axially through the inlet plate, retainer ring, and outlet plate. Other unique assembly methods may be employed to ensure correct alignment of the several components.
- the inner gerotor may be centered on a bushing pin supported by one of the inlet or outlet plates. Alternatively, the inner gerotor may be supported by the motor shaft itself, depending upon the size of the motor shaft. Separately manufactured components with alignment structures may complicate manufacturing, assembly, and increase costs and have a potentially negative impact on reliability.
- An integrated motor-driven pump is proposed that reduces the part count of the assembly and addresses several tolerance and alignment issues by combining the outlet plate and retainer ring of the pump into a single component.
- the integrated motor-driven pump may also include an axial bushing for support of the motor shaft and inner gerotor, ensuring concentric rotation of these components.
- Combining one of the inlet or outlet plates with the retainer ring and including a central bushing eliminates the need for alignment pins and complex assembly procedures.
- the disclosure also combines one of the motor end plates with the disclosed integrated pump inlet or outlet plate, retainer ring and central bushing, eliminating the need for a separate motor end plate and bushing to support the motor shaft.
- the disclosed motor-driven pump preferably employs a brushless motor configuration and directs pumped fluid through the motor for cooling and lubrication. Pumped fluid may also be directed to cool the control electronics which drive the brushless motor, directly or indirectly.
- the motor end plate is formed as a single component with one of the pump inlet or outlet plates, and incorporates the retainer ring and a central bushing to support both the motor shaft and inner gerotor.
- the pump stage may include as few as three components; the inner gerotor, outer gerotor and one plate of the pump (typically the inlet plate, which may alternatively be referred to as the inlet manifold.
- a motor end plate is adapted to serve as the inlet or outlet plate of a pump secured to an axial end of the motor driving the pump.
- a motor end plate is integrated with an inlet or outlet plate of a pump, a guide ring of the pump and bushings to support the motor shaft and rotating pump parts.
- FIG. 1 is a partially exploded view of a first embodiment of a gerotor pump partially integrated with an electric motor
- FIG. 2 is a sectional view through the gerotor pump partially integrated with an electric motor as shown in FIG. 1 ;
- FIG. 3 is a second embodiment of a gerotor pump integrated with an electric motor
- FIG. 4 is a sectional view through the gerotor pump integrated with an electric motor as shown in FIG. 3 .
- FIGS. 5 and 6 are perspective views of the combined motor end plate, pump outlet plate, central bushing and pump retainer ring of the embodiment shown in FIGS. 3 and 4 .
- FIGS. 1 and 2 A first embodiment of a gerotor pump 10 partially integrated with its drive motor 20 is illustrated in FIGS. 1 and 2 .
- FIGS. 3-6 A second embodiment of a gerotor pump 110 integrated with its drive motor 120 is illustrated in FIGS. 3-6 .
- Both embodiments are compatible with brushed or brushless DC motors, where the motor is assembled into a cylindrical housing and includes motor end plates spanning each longitudinal end of the housing.
- the motor end plates typically include bushings for supporting the motor shaft and openings to allow fluid being pumped to pass through the motor assembly between the rotor and stator and over the bushings to lubricate and cool the motor assembly during use.
- FIG. 1 illustrates an embodiment where an end plate 22 of the motor is formed as an outlet plate of the pump stage. This configuration eliminates the manufacture of a separate motor end plate in addition to the pump outlet plate.
- the motor end plate 22 includes at least one outlet port 24 configured to direct fluid from the gerotor set into the cylindrical motor housing 26 , where fluid flows between the rotor 36 and stator 30 , as well as over the bushings 32 , 34 that support both ends of the motor shaft 28 (Depicted in FIG. 2 ).
- the gerotor pump 10 also includes an inlet plate (or manifold) 12 with an inlet opening 15 , a retainer ring 14 , an outer gerotor 16 , an inner gerotor 17 , and a motor coupling 18 .
- a pair of alignment pins 40 aid in aligning the retainer ring 14 with the inlet and outlet plates 12 , 22 , in turn also providing alignment between the inner gerotor 17 and motor shaft 28 .
- a bushing 13 seated in the inlet plate 12 supports the inner gerotor 17 for rotation within the pumping chamber.
- the retainer ring inner surface 19 supports the outer geroter 16 .
- the retainer ring inner surface 19 defines a circle that is eccentric to the axis of motor shaft rotation and the outside surface of bushing 13 .
- Fasteners 42 secure the pump stage 10 to the motor end plate/outlet plate (or manifold) 12 .
- the disclosed combined motor end plate/outlet manifold 22 is constructed of materials and surface properties compatible with its function as a working surface of a gerotor pump 10 .
- the material must be resistant to wear and begin with a planar (flat) surface that will cooperate with adjacent surfaces of the gerotor set to define differential pressure zones within the pump 10 .
- Suitable materials include steel or alloy that is cast or machined and finished to the correct dimensions. Powdered metallurgy may also be employed to form parts such as the combined motor end plate/outlet manifold/retainer ring component 150 of the embodiment shown in FIGS. 5 and 6 , as well as the inner and outer gerotors 16 , 17 , 116 , 117 .
- the steel or alloy may begin as sheet or bar stock, which is cut and finished by methods known in the art. Tolerance stack in both the axial and radial direction can impact gerotor operation, so forming several support surfaces on the same component should reduce tolerance variation and improve pump operation and reliability.
- the motor shaft 28 , inner gerotor 17 , and outer gerotor 16 are supported for rotation by different components, making it more challenging to ensure that the motor shaft 28 and inner gerotor 17 are truly concentric, and the proper eccentric is provided to guide rotation of the outer gerotor 16 .
- the motor coupling 18 is designed to allow for some misalignment of the motor shaft 28 with the axis of rotation of the inner gerotor 17 . While the embodiment of FIG. 1 does reduce part count relative to some prior art configurations, further improvements may be possible.
- FIGS. 3-6 integrates the retainer ring with the pump outlet plate and arranges the combined structure 150 to serve as one of the motor end plates.
- the center of the combined retainer ring and outlet plate includes a radially inside surface 152 that locates a bushing to support the motor shaft 128 .
- the center of the combined retainer ring and outlet plate 150 also includes a boss 154 having a radially outside surface 156 that is arranged to support the inner gerotor 117 .
- the same structure supports both the motor shaft 128 and inner gerotor 117 .
- the motor shaft 128 extends through the center of the combined retainer ring and outlet plate 150 to engage the inner gerotor 117 and apply rotational force to the gerotor set during operation.
- the integral retainer ring inside surface 119 defines a circle that is eccentric relative to the axis of motor shaft rotation and the outside surface 156 of the center boss 154 which defines the axis of rotation of the inner gerotor 117 .
- Rotation of the gerotor set within the integral retainer ring 150 produces differential pressures that draw fluid in through the inlet openings 115 in the inlet plate 112 and force fluid out through the outlet openings 124 in the outlet plate integral to the retainer ring 150 .
- the integral retainer ring outside surface 151 radially accommodates the cylindrical motor housing 126 .
- FIGS. 1 and 3 show the dramatic reduction in part count of the second embodiment of FIGS. 3-6 relative to the first embodiment of FIG. 1 .
- the integral retainer ring 150 and central boss 154 that supports both the motor shaft 128 and the inner gerotor 117 reduce the parts necessary to ensure concentricity of rotation for the pump components relative to the motor shaft 128 . Precise positioning of the pump and motor components ensures smooth and reliable operation of the motor driven pump.
- the disclosed concept for integrating a compact pump with an electric motor is discussed in the context of a gerotor pump, but is not limited to only this pump configuration.
- Other compact pump configurations employ an eccentric surface to guide pump components or to direct fluid flow through the pump and may advantageously employ the disclosed concepts.
- Such pumps include, but are not limited to vane and roller vane pumps.
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- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
An integrated motor-driven pump is proposed that reduces the part count of the assembly and addresses several tolerance and alignment issues by combining the outlet plate and retainer ring of the pump into a single component. The integrated motor-driven pump may also include an axial bushing for support of the motor shaft and inner gerotor, ensuring concentric rotation of these components. Combining one of the inlet or outlet plates with the retainer ring and including a central bushing eliminates the need for alignment pins and complex assembly procedures. The disclosure also combines one of the motor end plates with the disclosed integrated pump inlet or outlet plate, retainer ring and central bushing, eliminating the need for a separate motor end plate and bushing to support the motor shaft.
Description
- This disclosure relates to compact configurations for combining a pump stage with a motor.
- Compact motor-driven pumps are commonly employed to deliver fuel, lubricants, hydraulic or other fluids in equipment, land and water vehicles and aircraft. The pumps and motors are commonly manufactured separately and then assembled into the same housing, which may also serve as a conduit for fluid being pumped. The fluid being pumped may circulate through the motor to lubricate and cool the motor and electronics associated with a brushless motor configuration.
- Roller vane, gerotor and turbine pump stages are commonly employed in such assemblies, with the pump stage selected based on the characteristics of the fluid being pumped and the pressure and volume of fluid flow required by the system. In the case of roller vane and gerotor pump designs, the pump stage typically includes three components that define a pumping chamber. An inlet plate defines one or more arcuate inlet ports for fluid to enter the pumping chamber and defines one axial side of the pumping chamber. An outlet plate defines one or more arcuate outlet ports and defines the opposite axial side of the pumping chamber. A retainer ring is sandwiched between the inlet and outlet plates and defines the radial, inside surface of the pumping chamber. In roller vane and gerotor pumps, the inside surface of the pumping chamber is defined by a circle eccentric from the center (rotational) axis of the motor and pump. The position of the inlet and outlet ports, in combination with eccentrically rotating roller vane or gerotor pump components, result in differential pressures in the pump chamber that force fluid through the pump from the inlet to the outlet. Pumped fluid may be directed through the motor for the purpose of cooling and lubrication.
- With respect to gerotor pumps in particular, the geometry and alignment of pump components is critical to smooth and reliable pump operation. One important relationship is the rotational axis of the inner gerotor and rotational axis of the motor shaft, which are preferably concentric (as close to the same axis as possible). Most gerotor pumps employ separately manufactured inlet and outlet plates axially spaced by the retainer ring. Separately manufactured parts must be tightly tolerance to prevent tolerance stack up issues that will interfere with proper gerotor pump operation. Further, the separate components must be carefully aligned during assembly to ensure a concentric relationship between the motor shaft, the inner gerotor and the eccentric path of the outer gerotor. Alignment is typically accomplished by pins or fasteners extending axially through the inlet plate, retainer ring, and outlet plate. Other unique assembly methods may be employed to ensure correct alignment of the several components. The inner gerotor may be centered on a bushing pin supported by one of the inlet or outlet plates. Alternatively, the inner gerotor may be supported by the motor shaft itself, depending upon the size of the motor shaft. Separately manufactured components with alignment structures may complicate manufacturing, assembly, and increase costs and have a potentially negative impact on reliability.
- An integrated motor-driven pump is proposed that reduces the part count of the assembly and addresses several tolerance and alignment issues by combining the outlet plate and retainer ring of the pump into a single component. The integrated motor-driven pump may also include an axial bushing for support of the motor shaft and inner gerotor, ensuring concentric rotation of these components. Combining one of the inlet or outlet plates with the retainer ring and including a central bushing eliminates the need for alignment pins and complex assembly procedures. The disclosure also combines one of the motor end plates with the disclosed integrated pump inlet or outlet plate, retainer ring and central bushing, eliminating the need for a separate motor end plate and bushing to support the motor shaft.
- The disclosed motor-driven pump preferably employs a brushless motor configuration and directs pumped fluid through the motor for cooling and lubrication. Pumped fluid may also be directed to cool the control electronics which drive the brushless motor, directly or indirectly. The motor end plate is formed as a single component with one of the pump inlet or outlet plates, and incorporates the retainer ring and a central bushing to support both the motor shaft and inner gerotor. The pump stage may include as few as three components; the inner gerotor, outer gerotor and one plate of the pump (typically the inlet plate, which may alternatively be referred to as the inlet manifold.
- In one embodiment, a motor end plate is adapted to serve as the inlet or outlet plate of a pump secured to an axial end of the motor driving the pump.
- In one embodiment, a motor end plate is integrated with an inlet or outlet plate of a pump, a guide ring of the pump and bushings to support the motor shaft and rotating pump parts.
- Alternative embodiments of the disclosed integrated motor pump may incorporate one or more of the disclosed features and relationships included in the detailed description below.
-
FIG. 1 is a partially exploded view of a first embodiment of a gerotor pump partially integrated with an electric motor; and -
FIG. 2 is a sectional view through the gerotor pump partially integrated with an electric motor as shown inFIG. 1 ; -
FIG. 3 is a second embodiment of a gerotor pump integrated with an electric motor; -
FIG. 4 is a sectional view through the gerotor pump integrated with an electric motor as shown inFIG. 3 , and -
FIGS. 5 and 6 are perspective views of the combined motor end plate, pump outlet plate, central bushing and pump retainer ring of the embodiment shown inFIGS. 3 and 4 . - A first embodiment of a
gerotor pump 10 partially integrated with itsdrive motor 20 is illustrated inFIGS. 1 and 2 . A second embodiment of agerotor pump 110 integrated with itsdrive motor 120 is illustrated inFIGS. 3-6 . Both embodiments are compatible with brushed or brushless DC motors, where the motor is assembled into a cylindrical housing and includes motor end plates spanning each longitudinal end of the housing. The motor end plates typically include bushings for supporting the motor shaft and openings to allow fluid being pumped to pass through the motor assembly between the rotor and stator and over the bushings to lubricate and cool the motor assembly during use. -
FIG. 1 illustrates an embodiment where anend plate 22 of the motor is formed as an outlet plate of the pump stage. This configuration eliminates the manufacture of a separate motor end plate in addition to the pump outlet plate. In the embodiment ofFIG. 1 , themotor end plate 22 includes at least oneoutlet port 24 configured to direct fluid from the gerotor set into thecylindrical motor housing 26, where fluid flows between therotor 36 andstator 30, as well as over thebushings FIG. 2 ). Thegerotor pump 10 also includes an inlet plate (or manifold) 12 with an inlet opening 15, aretainer ring 14, anouter gerotor 16, aninner gerotor 17, and amotor coupling 18. A pair ofalignment pins 40 aid in aligning theretainer ring 14 with the inlet andoutlet plates inner gerotor 17 andmotor shaft 28. Abushing 13 seated in theinlet plate 12 supports theinner gerotor 17 for rotation within the pumping chamber. The retainer ringinner surface 19 supports theouter geroter 16. The retainer ringinner surface 19 defines a circle that is eccentric to the axis of motor shaft rotation and the outside surface ofbushing 13.Fasteners 42 secure thepump stage 10 to the motor end plate/outlet plate (or manifold) 12. - The disclosed combined motor end plate/
outlet manifold 22 is constructed of materials and surface properties compatible with its function as a working surface of agerotor pump 10. The material must be resistant to wear and begin with a planar (flat) surface that will cooperate with adjacent surfaces of the gerotor set to define differential pressure zones within thepump 10. Suitable materials include steel or alloy that is cast or machined and finished to the correct dimensions. Powdered metallurgy may also be employed to form parts such as the combined motor end plate/outlet manifold/retainer ring component 150 of the embodiment shown inFIGS. 5 and 6 , as well as the inner andouter gerotors - It will be observed that, in the embodiment of
FIGS. 1 and 2 , themotor shaft 28,inner gerotor 17, andouter gerotor 16 are supported for rotation by different components, making it more challenging to ensure that themotor shaft 28 andinner gerotor 17 are truly concentric, and the proper eccentric is provided to guide rotation of theouter gerotor 16. In the embodiment ofFIGS. 1 and 2 , themotor coupling 18 is designed to allow for some misalignment of themotor shaft 28 with the axis of rotation of theinner gerotor 17. While the embodiment ofFIG. 1 does reduce part count relative to some prior art configurations, further improvements may be possible. - The embodiment of
FIGS. 3-6 integrates the retainer ring with the pump outlet plate and arranges the combinedstructure 150 to serve as one of the motor end plates. As best shown inFIG. 4 , the center of the combined retainer ring and outlet plate includes a radially insidesurface 152 that locates a bushing to support themotor shaft 128. The center of the combined retainer ring andoutlet plate 150 also includes aboss 154 having a radially outsidesurface 156 that is arranged to support theinner gerotor 117. The same structure supports both themotor shaft 128 andinner gerotor 117. Themotor shaft 128 extends through the center of the combined retainer ring andoutlet plate 150 to engage theinner gerotor 117 and apply rotational force to the gerotor set during operation. The integral retainer ring insidesurface 119 defines a circle that is eccentric relative to the axis of motor shaft rotation and theoutside surface 156 of thecenter boss 154 which defines the axis of rotation of theinner gerotor 117. Rotation of the gerotor set within theintegral retainer ring 150 produces differential pressures that draw fluid in through theinlet openings 115 in theinlet plate 112 and force fluid out through theoutlet openings 124 in the outlet plate integral to theretainer ring 150. In the depicted embodiment, the integral retainer ring outsidesurface 151 radially accommodates thecylindrical motor housing 126. - Comparison of
FIGS. 1 and 3 show the dramatic reduction in part count of the second embodiment ofFIGS. 3-6 relative to the first embodiment ofFIG. 1 . Theintegral retainer ring 150 andcentral boss 154 that supports both themotor shaft 128 and theinner gerotor 117 reduce the parts necessary to ensure concentricity of rotation for the pump components relative to themotor shaft 128. Precise positioning of the pump and motor components ensures smooth and reliable operation of the motor driven pump. - The disclosed concept for integrating a compact pump with an electric motor is discussed in the context of a gerotor pump, but is not limited to only this pump configuration. Other compact pump configurations employ an eccentric surface to guide pump components or to direct fluid flow through the pump and may advantageously employ the disclosed concepts. Such pumps include, but are not limited to vane and roller vane pumps.
Claims (3)
1. A motor-driven pump comprising:
a motor having an exterior housing surrounding a stator and a rotor supported on a shaft, said motor having a first end plate with a first bushing supporting the shaft at a first end, and a second end plate having a second bushing supporting the shaft at a second end, said shaft passing through said second end plate, said second end plate including an integrally formed retainer ring and a central boss, both said central boss and said retainer ring projecting axially away from said motor to define a pump cavity, said retainer ring having an inside surface defined by a circle eccentric to an axis of rotation of said motor shaft, said central boss including an outside surface concentric with the axis of rotation of said motor shaft;
a pump rotor received in said pump cavity and seated on said central boss;
one or more pump components engaged with said retainer ring inside surface to produce differential pressures within said pump cavity during rotation of said pump rotor; and
a pump inlet plate secured to said retainer ring to retain said pump rotor and components in said pump cavity.
2. The motor-driven pump of claim 1 , wherein said pump rotor is the inner rotor of a gerotor pump and said one or more pump components are the outer gerotor of a gerotor pump.
3. The motor-driven pump of claim 1 , wherein said pump rotor includes radial slots and said components are roller vanes of a roller vane pump.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US15/187,085 US20160369796A1 (en) | 2015-06-19 | 2016-06-20 | Integrated Motor-Pump |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US201562182232P | 2015-06-19 | 2015-06-19 | |
US201662276272P | 2016-01-08 | 2016-01-08 | |
US15/187,085 US20160369796A1 (en) | 2015-06-19 | 2016-06-20 | Integrated Motor-Pump |
Publications (1)
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US20160369796A1 true US20160369796A1 (en) | 2016-12-22 |
Family
ID=57546506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US15/187,085 Abandoned US20160369796A1 (en) | 2015-06-19 | 2016-06-20 | Integrated Motor-Pump |
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US (1) | US20160369796A1 (en) |
WO (1) | WO2016205792A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115263631A (en) * | 2022-06-09 | 2022-11-01 | 上海汽车集团股份有限公司 | Positive pressure integrated fuel filter |
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US20090202368A1 (en) * | 2008-02-07 | 2009-08-13 | Denso Corporation | Electric fuel pump |
US20140314591A1 (en) * | 2013-04-18 | 2014-10-23 | Delphi Technologies, Inc. | Fluid pump |
US20160245284A1 (en) * | 2015-02-25 | 2016-08-25 | Delphi Technologies, Inc. | Fluid pump |
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US4978282A (en) * | 1989-09-18 | 1990-12-18 | Industrial Technology Research Institute | Electrical fuel pump for small motorcycle engine |
US7278841B2 (en) * | 2001-12-13 | 2007-10-09 | Performance Pumps, Llc | Gerotor pump |
US6769889B1 (en) * | 2003-04-02 | 2004-08-03 | Delphi Technologies, Inc. | Balanced pressure gerotor fuel pump |
DE10341841A1 (en) * | 2003-09-09 | 2005-04-07 | Siemens Ag | According to the gerotor principle working fuel pump |
US8535030B2 (en) * | 2010-02-17 | 2013-09-17 | Kelly Hee Yu Chua | Gerotor hydraulic pump with fluid actuated vanes |
-
2016
- 2016-06-20 US US15/187,085 patent/US20160369796A1/en not_active Abandoned
- 2016-06-20 WO PCT/US2016/038354 patent/WO2016205792A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US5401143A (en) * | 1993-06-07 | 1995-03-28 | Ford Motor Company | Multi-stage automotive fuel pump having angeled fuel transfer passage |
US20090202368A1 (en) * | 2008-02-07 | 2009-08-13 | Denso Corporation | Electric fuel pump |
US20140314591A1 (en) * | 2013-04-18 | 2014-10-23 | Delphi Technologies, Inc. | Fluid pump |
US20160245284A1 (en) * | 2015-02-25 | 2016-08-25 | Delphi Technologies, Inc. | Fluid pump |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN115263631A (en) * | 2022-06-09 | 2022-11-01 | 上海汽车集团股份有限公司 | Positive pressure integrated fuel filter |
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WO2016205792A1 (en) | 2016-12-22 |
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