EP2918839B1 - Electric pump - Google Patents
Electric pump Download PDFInfo
- Publication number
- EP2918839B1 EP2918839B1 EP15154648.8A EP15154648A EP2918839B1 EP 2918839 B1 EP2918839 B1 EP 2918839B1 EP 15154648 A EP15154648 A EP 15154648A EP 2918839 B1 EP2918839 B1 EP 2918839B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- partition member
- motor
- case
- rotor
- 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.)
- Not-in-force
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Classifications
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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
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/0023—Axial sealings for working fluid
- F04C15/0026—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
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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
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/0023—Axial sealings for working fluid
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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
- F04C2240/00—Components
- F04C2240/30—Casings or housings
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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
- F04C2240/50—Bearings
- F04C2240/51—Bearings for cantilever assemblies
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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
- F04C2250/00—Geometry
- F04C2250/10—Geometry of the inlet or outlet
- F04C2250/101—Geometry of the inlet or outlet of the inlet
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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
- F04C2250/00—Geometry
- F04C2250/10—Geometry of the inlet or outlet
- F04C2250/102—Geometry of the inlet or outlet of the outlet
Definitions
- This disclosure generally relates to an electric pump.
- a known electric pump is used, for example, to supply oil pressure to a device which is driven by operation oil.
- the constructions of known electric pumps are disclosed in JP2012-189015A (hereinafter referred to as Patent reference 1) and shown in Fig. 3 .
- An electric pump unit disclosed in Patent reference 1 includes a motor housing which has a built-in electric motor.
- the motor housing is fixed to a pump body.
- a pump chamber is formed within the pump body.
- a bearing device supporting the electric motor is provided within the motor housing.
- Another electric pump 100 shown in a side cross-sectional view (longitudinal cross-sectional view) in Fig. 3 includes a motor rotor 111, a bearing portion 130 and a pump rotor 121 along an axial direction of a rotary shaft 150 in the aforementioned order.
- the known electric pump is required to be downsized as much as possible to be mounted to various devices.
- the bearing device is housed within the motor housing so that the electric pump unit is downsized.
- the electric pump unit is required to secure a space for the bearing device within the motor housing, it is not easy to further downsize the electric pump unit.
- the electric pump 100 shown in Fig. 3 is required to secure each length of the motor rotor 111, the bearing portion 130 and the pump rotor 121 in the axial direction of the rotary shaft 150. Thus, it is not easy to decrease the length of the electric pump 100 in the axial direction.
- DE 10 2012 204 191 A1 discloses an electric oil pump including an electric motor, a first pump element that is driven to suck and discharge oil by output torque of the electric motor, a second pump element that is driven to suck and discharge the oil by the output torque of the electric motor, and a torque transmission-switching member.
- US 2010/0130327 A1 discloses a multi-drive pump with a pump housing, an inlet port, an outlet port, a primary pump gear, a secondary pump gear, a first internal mechanical drive mechanism coupled to the primary pump gear and a second internal mechanical drive mechanism and an internal electro-magnetic drive mechanism coupled to the secondary pump gear.
- an electric pump includes a motor rotor, a pump rotor, a rotary shaft being mounted to the motor rotor and the pump rotor, a case body including a motor chamber housing the motor rotor, a pump chamber housing the pump rotor, and a bearing portion cantilevering an end portion of opposing end portions of the rotary shaft, the end portion protruding from the pump rotor in a direction opposite from the motor rotor, an inlet passage being provided at the case body and communicating with the pump chamber, and an outlet passage being provided at the case body and communicating with the pump chamber.
- the inlet passage and the outlet passage are disposed radially outward of the rotary shaft relative to the bearing portion.
- the motor chamber and the pump chamber are partitioned by a plate-shaped partition member.
- the partition member includes an annular seal member provided at an outer rim portion of the partition member.
- the case body includes a motor case defining the motor chamber and a pump case defining the pump chamber. The motor case and the pump case sandwich the seal member and a portion of the partition member, the portion being disposed at an inner circumference of the partition member relative to the seal member, the portion being away from the seal member
- the bearing portion, the inlet passage and the outlet passage are disposed next to one another along the axial direction of the rotary shaft. Accordingly, the length of the electric pump in the axial direction decreases comparing to a known electric pump which includes the bearing portion and the set of the inlet passage and the outlet passage being disposed in series, or in the axial direction. Thus, the electric pump is downsized. According to the aforementioned construction, the length of the partition member which partitions the motor chamber from the pump chamber along the rotary shaft decreases. Thus, the electric pump is downsized. According to the aforementioned construction, the portion of the partition member being sandwiched by the motor case and the pump case is disposed at the inner portion relative to the second seal member. Accordingly, the bending moment applied to the partition member by the outlet pressure and the inlet pressure of the electric pump decreases. Thus, the deformation of the partition member is prevented. Further, the thickness of the partition member can be thinner so that the electric pump is downsized.
- the bearing portion, the inlet passage and the outlet passage are disposed next to one another along an axial direction of the rotary shaft.
- the length of the electric pump in the axial direction decreases comparing to the known electric pump which includes the bearing portion and the set of the inlet passage and the outlet passage being disposed in series, or in the axial direction.
- the electric pump is downsized.
- the partition member includes a fixing portion for fixing the partition member to one of the motor case and the pump case.
- the partition member is positioned and is temporarily fixed to one of the motor case and the pump case 25 before being sandwiched by the motor case and the pump case. Accordingly, the process for sandwiching the partition member by the motor case and the pump case is performed easily.
- the pump chamber includes an inlet port and an outlet port.
- the partition member includes a plurality of recessed portions disposed at positions facing the inlet port or the outlet port, respectively.
- a first recessed portion faces the inlet port while a second recessed portion faces the outlet port so that the contact area of the pump rotor and the partition member can decrease.
- the partition member is made from a metal plate and is formed by stamping.
- the forming process of the partition member is easily performed.
- the electric pump further includes a communication hole extending from the bearing portion to the inlet passage along a radial direction of the rotary shaft.
- the bearing portion and the inlet passage are disposed next to each other along the axial direction of the rotary shaft.
- the inlet passage can be used for forming the communication hole.
- the electric pump 1 is configured with an electric motor portion 10, a pump portion 20, a bearing portion 30 and a partition member 40.
- the electric motor portion 10 serves as a driving source of the electric pump 1 and includes a motor rotor 11 which integrally rotates with a rotary shaft 50 and a stator.
- the motor rotor 11 is attached to the rotary shaft 50 which integrally rotates with the motor rotor 11.
- the motor rotor 11, the stator and the rotary shaft 50 are provided at a motor chamber 14 which is defined by a motor case 15.
- the pump portion 20 includes a pump rotor 21, an inlet passage 22 and an outlet passage 23.
- the pump portion 20 of the first embodiment corresponds to a known trochoid pump.
- the pump rotor 21 is attached to the rotary shaft 50 which integrally rotates with the pump rotor 21.
- the motor rotor 11 is attached to the rotary shaft 50.
- the pump rotor 21 is housed in a pump chamber 24 which is defined by a pump case 25.
- a case body 95 is configured with the pump case 25 and the motor case 15.
- Each of the inlet passage 22 and the outlet passage 23 is provided at the case body 95 and communicates with the pump chamber 24.
- the inlet passage 22 corresponds to an oil passage which delivers and supplies fluid to the pump chamber 24.
- the outlet passage 23 corresponds to an oil passage which delivers fluid which is discharged from the pump chamber 24.
- the bearing portion 30 cantilevers an end portion of opposing end portions of the rotary shaft 50, the end portion protruding from the pump rotor 21 in a direction opposite from the motor rotor 11. Accordingly, a first side of the pump rotor 21 in the axial direction is provided with the motor rotor 11 while a second side of the pump rotor 21 in the axial direction is provided with the bearing portion 30.
- the bearing portion 30 corresponds to a known sliding bearing and rotatably supports the rotary shaft 50.
- the bearing portion 30 is provided at the case body 95.
- Each of the inlet passage 22 and the outlet passage 23 is disposed at a position which is outward in a radial direction of the rotary shaft 50 relative to the bearing portion 30.
- the bearing portion 30, the inlet passage 22 and the outlet passage 23 are disposed next to one another along the axial direction of the rotary shaft 50. Accordingly, the length of the electric pump 1 in the axial direction can decrease.
- the partition member 40 is formed in a plate shape and partitions the motor chamber 14 from the pump chamber 24.
- the motor rotor 11 is housed in the motor chamber 14.
- the pump rotor 21 is housed in the pump chamber 24.
- the pump chamber 24 delivers the fluid supplied to and discharged from the pump portion 20.
- the partition member 40 liquid-tightly partitions the motor chamber 14 from the pump chamber 24 to prevent the fluid within the pump chamber 24 from entering into the motor chamber 14.
- a first seal member 51 is provided at the rotary shaft 50 to prevent the fluid from reaching a side or a surface of the partition member 40 which is close to the motor chamber 14.
- the first seal member 51 is made from, for example, an elastic member.
- the partition member 40 includes an annular second seal member 45 which is disposed at an outer rim portion 41 of the partition member 40.
- the outer rim portion 41 corresponds to an outer circumferential surface of the plate-shaped partition member 40.
- the second seal member 45 covers the outer circumferential surface of the partition member 40 while protruding from the outer circumferential surface in opposing directions and in the axial direction by a predetermined amount.
- the second seal member 45 is made from, for example, an elastic member, similarly to the first seal member 51.
- the partition member 40 includes a fixing portion which can fix the partition member 40 to one of the motor case 15 and the pump case 25.
- the partition member 40 is fixed to the pump case 25.
- the partition member 40 is provided with a recessed portion 43 (i.e., serving as a fixing portion) which serves as the fixing portion and is disposed at a surface facing the pump case 25.
- the pump case 25 includes a protruding portion 35 which faces the recessed portion 43.
- the protruding portion 35 is engaged with and inserted into the recessed portion 43 so that the partition member 40 is fixed to the pump case 25. Accordingly, the partition member 40 can be positioned and temporarily fixed to the pump case 25.
- the plural recessed portions 43 and the plural protruding portions 35 are shown in Fig. 1 .
- the partition member 40 is provided with at least one recessed portion 43 and at least one protruding portion 35.
- the motor case 15 and the pump case 25 sandwich the second seal member 45 and a portion of the partition member 40 which is disposed at an inner circumference of the partition member 40 relative to the second seal member 45 and is away from the second seal member 45.
- the inner circumferential portion of the partition member 40 relative to the second seal member 45 corresponds to a portion which is disposed at a position close to the rotary shaft 50 relative to the portion which is fixed by the second seal member 45.
- the partition member 40 is provided such that a first surface of the partition member 40 in the axial direction is in contact with the motor case 15 and a second surface of the partition member 40 in the axial direction is in contact with the pump case 25.
- the partition member 40 is fixed by the motor case 15 and the pump case 25 to prevent the leakage of the fluid.
- the partition member 40 can be fixed to either the pump case 25 or the motor case 15 by the application of the fixing portion before the motor case 15 and the pump case 25 are fixed by bolts 70.
- the partition member 40 is positioned and temporarily fixed to either the motor case 15 or the pump case 25 by the application of other bolts instead of being fixed by the recessed portion 43 and the protruding portion 35.
- the partition member 40 includes a first recessed portion 28 and a second recessed portion 29 which are disposed at positions facing an inlet port 26 and an outlet port 27 of the pump chamber 24, respectively.
- the inlet port 26 serves as an opening portion which is provided at the pump chamber 24 and communicated with the inlet passage 22.
- the outlet port 27 serves as an opening portion which is provided at the pump chamber 24 and communicated with the outlet passage 23.
- the hydraulic pressure level of the fluid applied to the outlet port 27 is higher than the hydraulic pressure level of the fluid applied to the inlet port 26 by an application of the pump portion 20.
- the inlet port 26 and the outlet port 27 are formed not to communicate with each other at the pump portion 24 to prevent the decrease of the hydraulic pressure level applied to outlet port 27.
- first and second recessed portions 28, 29 are formed not to communicate with each other.
- the first recessed portion 28 faces the inlet port 26 while the second recessed portion 29 faces the outlet port 27 so that a contact area of the pump rotor 21 and the partition member 40 can decrease.
- the friction caused by the rotation of the pump rotor 21 can decrease when the pump rotor 21 is rotated by the rotary shaft 50.
- the bearing portion 30 corresponds to the known sliding bearing.
- the fluid travels from the pump chamber 24 to the bearing portion 30 to reduce the frictional resistance of the bearing portion 30 and to prevent the abrasion of the bearing portion 30.
- the supplying amount of the fluid can be any amount as long as the bearing 30 can be lubricated.
- a guide portion 52 is provided at the bearing portion 30 and is disposed along the rotary shaft 50.
- the length of the guide portion 52 favorably corresponds to a length which is from one-third to a half of the bearing portion 30 in the axial direction. Accordingly, the fluid can be delivered to the bearing portion 30 automatically in accordance with the rotation of the pump rotor 21 so that the bearing portion 30 can be lubricated.
- a communication hole 53 is provided to be extended from the bearing portion 30 to the inlet passage 22 along the radial direction of the rotary shaft 50. As described above, the fluid including the higher fluid pressure by the application of the pump portion 20 than the fluid housed in the inlet port 26 is delivered to the bearing portion 30. Accordingly, the communication hole 53 returns the fluid delivered to the bearing 30 via the guide portion 52 to the inlet passage 22 automatically.
- An electric pump 100 shown in Fig. 3 is provided with a rotor motor 111 and a pump rotor 121.
- the motor rotor 111 is disposed at a first side of a bearing portion 130 in the axial direction of a rotary shaft 150.
- the pump rotor 121 is disposed at a second side of the bearing portion 130 in the axial direction of the rotary shaft 150.
- the electric pump 100 is configured with the motor rotor 111, the bearing portion 130 and the pump rotor 121 which are disposed in the aforementioned order in the axial direction of the rotary shaft 150 so that an inlet passage 122 and an outlet passage 123 cannot be disposed next to the bearing portion 130 to be positioned radially outward of the bearing portion 130.
- the bearing portion 130 is disposed between the motor rotor 111 and the pump rotor 121 so that the length of a pump case 125 is secured by the length of the bearing portion 130 in the axial direction.
- the electric pump 1 of the first embodiment shown in Fig. 1 is provided with the motor rotor 11 and the bearing portion 30.
- the motor rotor 11 is disposed at the first side of the pump rotor 21 in the axial direction of the rotary shaft 50.
- the bearing portion 30 is disposed at the second side of the pump rotor 21 in the axial direction of the rotary shaft 50.
- the electric pump 1 is configured with the motor rotor 11, the pump rotor 21 and the bearing portion 30 which are disposed in the aforementioned order in the axial direction of the rotary shaft 50 so that the bearing portion 30 is disposed next to the inlet passage 22 and the outlet passage 23 to be positioned at respective inner portions of the inlet passage 22 and the outlet passage 23 in the radial direction.
- the inlet passage 22 and the outlet passage 23 are disposed radially outward relative to the bearing portion 30 or are disposed at respective positions which face the bearing 30.
- the length of the electric pump 1 in the axial direction is shorter than the length of the electric pump 100 in the axial direction so that the electric pump 1 is downsized.
- the length of the electric pump 100 along the axial direction of the rotary shaft 150 corresponds to the total length of a first length A of an electric motor portion 110, a second length B of a portion of the pump case 125 supporting the bearing portion 130, a third length C of a pump portion 120 and a fourth length D of a flow passage forming portion 180 where the inlet passage 122 and the outlet passage 123 are provided.
- a fifth length E of the partition member 40 is added between the first length A of the electric motor portion 10 and the length C of the pump portion 20.
- the length of the electric pump 1 can decrease by a length calculated by subtracting the fifth length E of the partition member 40 from the fourth length D of the flow passage forming portion 80 (or the second length B of the portion of the pump case 25 supporting the bearing portion 30).
- a first seal member 151 seals the fluid which is supplied from an outlet port 127 of a pump chamber 124 to the bearing portion 130 via a guide portion 152 in order to lubricate the bearing portion 130 of the known electric pump 100.
- a communication hole 153 which returns the fluid reaching the first seal member 151 to the inlet port 126 of the pump chamber 124 cannot be formed in parallel with the axial direction of the rotary shaft 150 because the communication hole 153 communicates with the first recessed portion 128 which is disposed away from the first seal member 151 in the radial direction of the rotary shaft 150, or which is disposed away from the rotary shaft 150 relative to the first seal member 151.
- a jig supporting the pump case 125 is provided exclusively when the communication hole 153 is formed.
- the electric pump 1 of the first embodiment includes the communication hole 53 which is disposed in parallel with and to be extended from the inlet passage 22.
- a jig supporting the pump case 25 when the inlet passage 22 is formed and the jig supporting the pump case 25 when the communication hole 53 is formed can be integrated with each other, thereby reducing of the manufacturing cost for processing.
- the motor chamber 14 and the pump chamber 24 are partitioned by the plate-shaped partition member 40 which includes the first and second recessed portions 28, 29.
- the partition member 40 is formed of a metal plate which is stamped to include the first and second recessed portions 28, 29.
- the aforementioned partition member 40 can partition the motor chamber 14 from the pump chamber 24.
- the motor case 15 and the pump case 25 sandwich the second seal member 45 and a portion of the partition member 40 which is disposed close to the rotary shaft 50 relative to an outer rim portion 41 and is away from the second seal member 45.
- a first seal member 54 which is integrally formed with an inner rim portion 42 of the partition member 40 can support the rotary shaft 50.
- the pump chamber 24 can be liquid-tightly partitioned by the partition member 40.
- the electric pump 200 can prevent the fluid from entering into the motor chamber 14 from the pump chamber 24.
- a protruding portion serving as a fixing portion is formed by punching. The protruding portion is engaged with a recessed portion formed at the pump case 25 so that the partition member 40 is positioned at the pump case 25.
- the first seal member 51, 54 is provided at a first side of the opposing sides of the partition member 40 in the axial direction, the first side close to the motor chamber 14.
- the first seal member 51, 54 is not provided.
- the motor case 15 and the pump case 25 sandwich the second seal member 45 and the portion of the partition member 40 which is disposed at the inner circumference of the partition member 40 relative to the second seal member 45 and is away from the second seal member 45.
- the pump case 25 includes a recessed portion which is engaged with and is inserted by the partition member 40 so that the outer circumferential surface of the partition member 40 can be inlaid with the recessed portion of the pump case 25.
- a seal member is provided at an opposing surface where the partition member 40 and the motor case 15 face with each other, thereby preventing the fluid from entering into the motor chamber 14 from the pump chamber 24.
- the partition member 40 being inlaid with the recessed portion of the pump case 25 and the recessed portion of the pump case 25 can be formed in shapes which are different from the complete round so that the partition member 40 can be positioned and temporarily fixed to the pump case 25 easily.
- the first and second recessed portions 28, 29 are provided at the positions which face the inlet port 26 and the outlet port 27 of the pump chamber 24, respectively.
- the partition member 40 can be constructed without the first and second recessed portions 28, 29.
- the communication hole 53 is provided to be extended from the bearing portion 30 to the inlet passage 22 along the radial direction of the rotary shaft 50.
- a portion of the bearing portion 30 is exposed from a bottom surface of the pump case 25.
- An oil pan communicating with the inlet passage 22 can collect the fluid dripping from the exposed portion.
- the communication hole 53 does not have to be provided.
- the bearing portion 30 includes other lubrication mechanisms, the communication hole 53 does not have to be provided.
- This disclosure is applicable to an electric pump which is driven by an electric motor.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Rotary Pumps (AREA)
Description
- This disclosure generally relates to an electric pump.
- A known electric pump is used, for example, to supply oil pressure to a device which is driven by operation oil. The constructions of known electric pumps are disclosed in
JP2012-189015A Fig. 3 . - An electric pump unit disclosed in
Patent reference 1 includes a motor housing which has a built-in electric motor. The motor housing is fixed to a pump body. A pump chamber is formed within the pump body. A bearing device supporting the electric motor is provided within the motor housing. Anotherelectric pump 100 shown in a side cross-sectional view (longitudinal cross-sectional view) inFig. 3 includes amotor rotor 111, abearing portion 130 and apump rotor 121 along an axial direction of arotary shaft 150 in the aforementioned order. - The known electric pump is required to be downsized as much as possible to be mounted to various devices. According to the construction of the electric pump unit disclosed in
Patent reference 1, the bearing device is housed within the motor housing so that the electric pump unit is downsized. However, because the electric pump unit is required to secure a space for the bearing device within the motor housing, it is not easy to further downsize the electric pump unit. Theelectric pump 100 shown inFig. 3 is required to secure each length of themotor rotor 111, thebearing portion 130 and thepump rotor 121 in the axial direction of therotary shaft 150. Thus, it is not easy to decrease the length of theelectric pump 100 in the axial direction. -
DE 10 2012 204 191 A1 discloses an electric oil pump including an electric motor, a first pump element that is driven to suck and discharge oil by output torque of the electric motor, a second pump element that is driven to suck and discharge the oil by the output torque of the electric motor, and a torque transmission-switching member. -
US 2010/0130327 A1 discloses a multi-drive pump with a pump housing, an inlet port, an outlet port, a primary pump gear, a secondary pump gear, a first internal mechanical drive mechanism coupled to the primary pump gear and a second internal mechanical drive mechanism and an internal electro-magnetic drive mechanism coupled to the secondary pump gear. - A need thus exists for an electric pump that is downsized to be mounted to the various devices.
- According to an aspect of this disclosure, an electric pump includes a motor rotor, a pump rotor, a rotary shaft being mounted to the motor rotor and the pump rotor, a case body including a motor chamber housing the motor rotor, a pump chamber housing the pump rotor, and a bearing portion cantilevering an end portion of opposing end portions of the rotary shaft, the end portion protruding from the pump rotor in a direction opposite from the motor rotor, an inlet passage being provided at the case body and communicating with the pump chamber, and an outlet passage being provided at the case body and communicating with the pump chamber. The inlet passage and the outlet passage are disposed radially outward of the rotary shaft relative to the bearing portion. The motor chamber and the pump chamber are partitioned by a plate-shaped partition member. The partition member includes an annular seal member provided at an outer rim portion of the partition member. The case body includes a motor case defining the motor chamber and a pump case defining the pump chamber. The motor case and the pump case sandwich the seal member and a portion of the partition member, the portion being disposed at an inner circumference of the partition member relative to the seal member, the portion being away from the seal member
- According to the aforementioned construction, the bearing portion, the inlet passage and the outlet passage are disposed next to one another along the axial direction of the rotary shaft. Accordingly, the length of the electric pump in the axial direction decreases comparing to a known electric pump which includes the bearing portion and the set of the inlet passage and the outlet passage being disposed in series, or in the axial direction. Thus, the electric pump is downsized. According to the aforementioned construction, the length of the partition member which partitions the motor chamber from the pump chamber along the rotary shaft decreases. Thus, the electric pump is downsized. According to the aforementioned construction, the portion of the partition member being sandwiched by the motor case and the pump case is disposed at the inner portion relative to the second seal member. Accordingly, the bending moment applied to the partition member by the outlet pressure and the inlet pressure of the electric pump decreases. Thus, the deformation of the partition member is prevented. Further, the thickness of the partition member can be thinner so that the electric pump is downsized.
- According to another aspect of this disclosure, the bearing portion, the inlet passage and the outlet passage are disposed next to one another along an axial direction of the rotary shaft.
- According to the aforementioned construction, the length of the electric pump in the axial direction decreases comparing to the known electric pump which includes the bearing portion and the set of the inlet passage and the outlet passage being disposed in series, or in the axial direction. Thus, the electric pump is downsized.
- According to another aspect of this disclosure, the partition member includes a fixing portion for fixing the partition member to one of the motor case and the pump case.
- According to the aforementioned construction, the partition member is positioned and is temporarily fixed to one of the motor case and the
pump case 25 before being sandwiched by the motor case and the pump case. Accordingly, the process for sandwiching the partition member by the motor case and the pump case is performed easily. - According to still another aspect of this disclosure, the pump chamber includes an inlet port and an outlet port. The partition member includes a plurality of recessed portions disposed at positions facing the inlet port or the outlet port, respectively.
- According to the aforementioned construction, a first recessed portion faces the inlet port while a second recessed portion faces the outlet port so that the contact area of the pump rotor and the partition member can decrease. Thus, the friction caused by the rotation of the pump rotor decreases when the pump rotor is rotated by the rotary shaft.
- According to further aspect of this disclosure, the partition member is made from a metal plate and is formed by stamping.
- According to the aforementioned construction, the forming process of the partition member is easily performed.
- According to another aspect of this disclosure, the electric pump further includes a communication hole extending from the bearing portion to the inlet passage along a radial direction of the rotary shaft.
- According to the aforementioned construction, the bearing portion and the inlet passage are disposed next to each other along the axial direction of the rotary shaft. For example, in a case where the inlet passage is formed by perforating process along the radial direction of the rotary shaft, the inlet passage can be used for forming the communication hole.
- The foregoing and additional features and characteristics of this disclosure will become more apparent from the following detailed description considered with the reference to the accompanying drawings, wherein:
-
Fig. 1 is a side cross-sectional view of an electric pump according to a first embodiment disclosed here; -
Fig. 2 is a side cross-sectional view of an electric pump according to a second embodiment; and -
Fig. 3 is a side cross-sectional view of a known electric pump. - An
electric pump 1 of a first embodiment will be explained with reference toFig. 1 . Theelectric pump 1 is configured with anelectric motor portion 10, apump portion 20, abearing portion 30 and apartition member 40. - The
electric motor portion 10 serves as a driving source of theelectric pump 1 and includes amotor rotor 11 which integrally rotates with arotary shaft 50 and a stator. Themotor rotor 11 is attached to therotary shaft 50 which integrally rotates with themotor rotor 11. Themotor rotor 11, the stator and therotary shaft 50 are provided at amotor chamber 14 which is defined by amotor case 15. - The
pump portion 20 includes apump rotor 21, aninlet passage 22 and anoutlet passage 23. Thepump portion 20 of the first embodiment corresponds to a known trochoid pump. Thepump rotor 21 is attached to therotary shaft 50 which integrally rotates with thepump rotor 21. As described above, themotor rotor 11 is attached to therotary shaft 50. Thus, the rotary force of themotor rotor 11 is transmitted to thepump rotor 21 via therotary shaft 50. Thepump rotor 21 is housed in apump chamber 24 which is defined by apump case 25. Acase body 95 is configured with thepump case 25 and themotor case 15. - Each of the
inlet passage 22 and theoutlet passage 23 is provided at thecase body 95 and communicates with thepump chamber 24. Theinlet passage 22 corresponds to an oil passage which delivers and supplies fluid to thepump chamber 24. Theoutlet passage 23 corresponds to an oil passage which delivers fluid which is discharged from thepump chamber 24. - The bearing
portion 30 cantilevers an end portion of opposing end portions of therotary shaft 50, the end portion protruding from thepump rotor 21 in a direction opposite from themotor rotor 11. Accordingly, a first side of thepump rotor 21 in the axial direction is provided with themotor rotor 11 while a second side of thepump rotor 21 in the axial direction is provided with the bearingportion 30. According to the first embodiment, the bearingportion 30 corresponds to a known sliding bearing and rotatably supports therotary shaft 50. The bearingportion 30 is provided at thecase body 95. - Each of the
inlet passage 22 and theoutlet passage 23 is disposed at a position which is outward in a radial direction of therotary shaft 50 relative to the bearingportion 30. Thus, the bearingportion 30, theinlet passage 22 and theoutlet passage 23 are disposed next to one another along the axial direction of therotary shaft 50. Accordingly, the length of theelectric pump 1 in the axial direction can decrease. - The
partition member 40 is formed in a plate shape and partitions themotor chamber 14 from thepump chamber 24. Themotor rotor 11 is housed in themotor chamber 14. On the other hand, thepump rotor 21 is housed in thepump chamber 24. Thepump chamber 24 delivers the fluid supplied to and discharged from thepump portion 20. Thepartition member 40 liquid-tightly partitions themotor chamber 14 from thepump chamber 24 to prevent the fluid within thepump chamber 24 from entering into themotor chamber 14. According to the first embodiment, a first seal member 51 is provided at therotary shaft 50 to prevent the fluid from reaching a side or a surface of thepartition member 40 which is close to themotor chamber 14. The first seal member 51 is made from, for example, an elastic member. - The
partition member 40 includes an annularsecond seal member 45 which is disposed at anouter rim portion 41 of thepartition member 40. Theouter rim portion 41 corresponds to an outer circumferential surface of the plate-shapedpartition member 40. Thesecond seal member 45 covers the outer circumferential surface of thepartition member 40 while protruding from the outer circumferential surface in opposing directions and in the axial direction by a predetermined amount. Thesecond seal member 45 is made from, for example, an elastic member, similarly to the first seal member 51. - The
partition member 40 includes a fixing portion which can fix thepartition member 40 to one of themotor case 15 and thepump case 25. According to the first embodiment, thepartition member 40 is fixed to thepump case 25. Thepartition member 40 is provided with a recessed portion 43 (i.e., serving as a fixing portion) which serves as the fixing portion and is disposed at a surface facing thepump case 25. Thepump case 25 includes a protrudingportion 35 which faces the recessedportion 43. The protrudingportion 35 is engaged with and inserted into the recessedportion 43 so that thepartition member 40 is fixed to thepump case 25. Accordingly, thepartition member 40 can be positioned and temporarily fixed to thepump case 25. The plural recessedportions 43 and the plural protrudingportions 35 are shown inFig. 1 . Alternatively, thepartition member 40 is provided with at least one recessedportion 43 and at least one protrudingportion 35. - The
motor case 15 and thepump case 25 sandwich thesecond seal member 45 and a portion of thepartition member 40 which is disposed at an inner circumference of thepartition member 40 relative to thesecond seal member 45 and is away from thesecond seal member 45. The inner circumferential portion of thepartition member 40 relative to thesecond seal member 45 corresponds to a portion which is disposed at a position close to therotary shaft 50 relative to the portion which is fixed by thesecond seal member 45. Thepartition member 40 is provided such that a first surface of thepartition member 40 in the axial direction is in contact with themotor case 15 and a second surface of thepartition member 40 in the axial direction is in contact with thepump case 25. Thus, thepartition member 40 is fixed by themotor case 15 and thepump case 25 to prevent the leakage of the fluid. - As described above, the
partition member 40 can be fixed to either thepump case 25 or themotor case 15 by the application of the fixing portion before themotor case 15 and thepump case 25 are fixed bybolts 70. Alternatively, thepartition member 40 is positioned and temporarily fixed to either themotor case 15 or thepump case 25 by the application of other bolts instead of being fixed by the recessedportion 43 and the protrudingportion 35. - The
partition member 40 includes a first recessedportion 28 and a second recessedportion 29 which are disposed at positions facing aninlet port 26 and anoutlet port 27 of thepump chamber 24, respectively. Theinlet port 26 serves as an opening portion which is provided at thepump chamber 24 and communicated with theinlet passage 22. Theoutlet port 27 serves as an opening portion which is provided at thepump chamber 24 and communicated with theoutlet passage 23. The hydraulic pressure level of the fluid applied to theoutlet port 27 is higher than the hydraulic pressure level of the fluid applied to theinlet port 26 by an application of thepump portion 20. Thus, theinlet port 26 and theoutlet port 27 are formed not to communicate with each other at thepump portion 24 to prevent the decrease of the hydraulic pressure level applied tooutlet port 27. Accordingly, the first and second recessedportions portion 28 faces theinlet port 26 while the second recessedportion 29 faces theoutlet port 27 so that a contact area of thepump rotor 21 and thepartition member 40 can decrease. Thus, the friction caused by the rotation of thepump rotor 21 can decrease when thepump rotor 21 is rotated by therotary shaft 50. - As described above, the bearing
portion 30 corresponds to the known sliding bearing. According to the first embodiment, the fluid travels from thepump chamber 24 to the bearingportion 30 to reduce the frictional resistance of the bearingportion 30 and to prevent the abrasion of the bearingportion 30. The supplying amount of the fluid can be any amount as long as the bearing 30 can be lubricated. - In order to guide the fluid which serves as lubricant oil from the area of the
pump chamber 24 where the higher pressure is applied, that is, theoutlet port 27 of thepump chamber 24, to the bearingportion 30, aguide portion 52 is provided at the bearingportion 30 and is disposed along therotary shaft 50. The length of theguide portion 52 favorably corresponds to a length which is from one-third to a half of the bearingportion 30 in the axial direction. Accordingly, the fluid can be delivered to the bearingportion 30 automatically in accordance with the rotation of thepump rotor 21 so that the bearingportion 30 can be lubricated. - A
communication hole 53 is provided to be extended from the bearingportion 30 to theinlet passage 22 along the radial direction of therotary shaft 50. As described above, the fluid including the higher fluid pressure by the application of thepump portion 20 than the fluid housed in theinlet port 26 is delivered to the bearingportion 30. Accordingly, thecommunication hole 53 returns the fluid delivered to thebearing 30 via theguide portion 52 to theinlet passage 22 automatically. - For purposes of understanding, the same components as those described in
Fig. 1 are marked with the same reference numerals inFig. 3 . Anelectric pump 100 shown inFig. 3 is provided with arotor motor 111 and apump rotor 121. Themotor rotor 111 is disposed at a first side of a bearingportion 130 in the axial direction of arotary shaft 150. Thepump rotor 121 is disposed at a second side of the bearingportion 130 in the axial direction of therotary shaft 150. Accordingly, theelectric pump 100 is configured with themotor rotor 111, the bearingportion 130 and thepump rotor 121 which are disposed in the aforementioned order in the axial direction of therotary shaft 150 so that aninlet passage 122 and anoutlet passage 123 cannot be disposed next to the bearingportion 130 to be positioned radially outward of the bearingportion 130. In addition, the bearingportion 130 is disposed between themotor rotor 111 and thepump rotor 121 so that the length of apump case 125 is secured by the length of the bearingportion 130 in the axial direction. - The
electric pump 1 of the first embodiment shown inFig. 1 is provided with themotor rotor 11 and the bearingportion 30. Themotor rotor 11 is disposed at the first side of thepump rotor 21 in the axial direction of therotary shaft 50. The bearingportion 30 is disposed at the second side of thepump rotor 21 in the axial direction of therotary shaft 50. Accordingly, theelectric pump 1 is configured with themotor rotor 11, thepump rotor 21 and the bearingportion 30 which are disposed in the aforementioned order in the axial direction of therotary shaft 50 so that the bearingportion 30 is disposed next to theinlet passage 22 and theoutlet passage 23 to be positioned at respective inner portions of theinlet passage 22 and theoutlet passage 23 in the radial direction. That is, theinlet passage 22 and theoutlet passage 23 are disposed radially outward relative to the bearingportion 30 or are disposed at respective positions which face thebearing 30. Thus, the length of theelectric pump 1 in the axial direction is shorter than the length of theelectric pump 100 in the axial direction so that theelectric pump 1 is downsized. - In particular, according to the known
electric pump 100 shown inFig. 3 , the length of theelectric pump 100 along the axial direction of therotary shaft 150 corresponds to the total length of a first length A of anelectric motor portion 110, a second length B of a portion of thepump case 125 supporting the bearingportion 130, a third length C of apump portion 120 and a fourth length D of a flowpassage forming portion 180 where theinlet passage 122 and theoutlet passage 123 are provided. On the other hand, according to theelectric pump 1 shown inFig. 1 , a fifth length E of thepartition member 40 is added between the first length A of theelectric motor portion 10 and the length C of thepump portion 20. However, because the bearingportion 30 is provided at the fluidpassage forming portion 80, the length of theelectric pump 1 can decrease by a length calculated by subtracting the fifth length E of thepartition member 40 from the fourth length D of the flow passage forming portion 80 (or the second length B of the portion of thepump case 25 supporting the bearing portion 30). - Further, as shown in
Fig. 3 , afirst seal member 151 seals the fluid which is supplied from anoutlet port 127 of apump chamber 124 to the bearingportion 130 via aguide portion 152 in order to lubricate the bearingportion 130 of the knownelectric pump 100. However, acommunication hole 153 which returns the fluid reaching thefirst seal member 151 to theinlet port 126 of thepump chamber 124 cannot be formed in parallel with the axial direction of therotary shaft 150 because thecommunication hole 153 communicates with the first recessedportion 128 which is disposed away from thefirst seal member 151 in the radial direction of therotary shaft 150, or which is disposed away from therotary shaft 150 relative to thefirst seal member 151. Accordingly, a jig supporting thepump case 125 is provided exclusively when thecommunication hole 153 is formed. On the other hand, theelectric pump 1 of the first embodiment includes thecommunication hole 53 which is disposed in parallel with and to be extended from theinlet passage 22. Thus, a jig supporting thepump case 25 when theinlet passage 22 is formed and the jig supporting thepump case 25 when thecommunication hole 53 is formed can be integrated with each other, thereby reducing of the manufacturing cost for processing. - The construction of an
electric pump 200 of a second embodiment will be explained. According to the aforementioned first embodiment, themotor chamber 14 and thepump chamber 24 are partitioned by the plate-shapedpartition member 40 which includes the first and second recessedportions Fig. 2 , thepartition member 40 is formed of a metal plate which is stamped to include the first and second recessedportions aforementioned partition member 40 can partition themotor chamber 14 from thepump chamber 24. - In addition, the
motor case 15 and thepump case 25 sandwich thesecond seal member 45 and a portion of thepartition member 40 which is disposed close to therotary shaft 50 relative to anouter rim portion 41 and is away from thesecond seal member 45. Instead of the first seal member 51 of the first embodiment, afirst seal member 54 which is integrally formed with aninner rim portion 42 of thepartition member 40 can support therotary shaft 50. According to the aforementioned construction of theelectric pump 200, thepump chamber 24 can be liquid-tightly partitioned by thepartition member 40. Thus, theelectric pump 200 can prevent the fluid from entering into themotor chamber 14 from thepump chamber 24. When the metal plate is stamped, a protruding portion serving as a fixing portion is formed by punching. The protruding portion is engaged with a recessed portion formed at thepump case 25 so that thepartition member 40 is positioned at thepump case 25. - According to the aforementioned first and second embodiments, the
first seal member 51, 54 is provided at a first side of the opposing sides of thepartition member 40 in the axial direction, the first side close to themotor chamber 14. Alternatively, for example, in a case where themotor rotor 11 is soaked with oil by an application of the fluid of thepump chamber 24, thefirst seal member 51, 54 is not provided. - According to the aforementioned first and second embodiments, the
motor case 15 and thepump case 25 sandwich thesecond seal member 45 and the portion of thepartition member 40 which is disposed at the inner circumference of thepartition member 40 relative to thesecond seal member 45 and is away from thesecond seal member 45. Alternatively, for example, thepump case 25 includes a recessed portion which is engaged with and is inserted by thepartition member 40 so that the outer circumferential surface of thepartition member 40 can be inlaid with the recessed portion of thepump case 25. In such a case, a seal member is provided at an opposing surface where thepartition member 40 and themotor case 15 face with each other, thereby preventing the fluid from entering into themotor chamber 14 from thepump chamber 24. In addition, thepartition member 40 being inlaid with the recessed portion of thepump case 25 and the recessed portion of thepump case 25 can be formed in shapes which are different from the complete round so that thepartition member 40 can be positioned and temporarily fixed to thepump case 25 easily. - According to the first and second embodiments, the first and second recessed
portions inlet port 26 and theoutlet port 27 of thepump chamber 24, respectively. Alternatively, thepartition member 40 can be constructed without the first and second recessedportions - According to the first and second embodiments, the
communication hole 53 is provided to be extended from the bearingportion 30 to theinlet passage 22 along the radial direction of therotary shaft 50. Alternatively, for example, a portion of the bearingportion 30 is exposed from a bottom surface of thepump case 25. An oil pan communicating with theinlet passage 22 can collect the fluid dripping from the exposed portion. In such a case, thecommunication hole 53 does not have to be provided. In a case where the bearingportion 30 includes other lubrication mechanisms, thecommunication hole 53 does not have to be provided. - This disclosure is applicable to an electric pump which is driven by an electric motor.
- It is explicitly stated that all features disclosed in the description and/or the claims are intended to be disclosed separately and independently from each other for the purpose of original disclosure as well as for the purpose of restricting the claimed invention independent of the composition of the features in the embodiments and/or the claims. It is explicitly stated that all value ranges or indications of groups of entities disclose every possible intermediate value or intermediate entity for the purpose of original disclosure as well as for the purpose of restricting the claimed invention, in particular as limits of value ranges.
Claims (6)
- An electric pump (1, 200), comprising:a motor rotor (11);a pump rotor (21);a rotary shaft (50) being mounted to the motor rotor (11) and the pump rotor (21);a case body (95) including a motor chamber (14) housing the motor rotor (11), a pump chamber (24) housing the pump rotor (21), and a bearing portion (30) cantilevering an end portion of opposing end portions of the rotary shaft (50), the end portion protruding from the pump rotor (21) in a direction opposite from the motor rotor (11);an inlet passage (22) being provided at the case body (95) and communicating with the pump chamber (24); andan outlet passage (23) being provided at the case body (95) and communicating with the pump chamber (24); whereinthe inlet passage (22) and the outlet passage (23) are disposed radially outward of the rotary shaft (50) relative to the bearing portion (30), characterized in thatthe motor chamber (14) and the pump chamber (24) are partitioned by a plate-shaped partition member (40), whereinthe partition member (40) includes an annular seal member (45) provided at an outer rim portion (41) of the partition member (40);the case body (95) includes a motor case (15) defining the motor chamber (14) and a pump case (25) defining the pump chamber (24); andthe motor case (15) and the pump case (25) sandwich the seal member (45) and a portion of the partition member (40), the portion being disposed at an inner circumference of the partition member (40) relative to the seal member (45), the portion being away from the seal member (45).
- The electric pump (1, 200) according to claim 1, wherein the bearing portion (30), the inlet passage (22) and the outlet passage (23) are disposed next to one another along an axial direction of the rotary shaft (50).
- The electric pump (1, 200) according to claims 1 or 2, wherein the partition member (40) includes a fixing portion (43) for fixing the partition member (40) to one of the motor case (15) and the pump case (25).
- The electric pump (1, 200) according to any one of claims 1 to 3, wherein
the pump chamber (24) includes an inlet port (26) and an outlet port (27); and
the partition member (40) includes a plurality of recessed portions (28, 29) disposed at positions facing the inlet port (26) and the outlet port (27), respectively. - The electric pump (200) according to any one of claims 1 to 4, wherein the partition member (40) is made from a metal plate and is formed by stamping.
- The electric pump (1, 200) according to any one of claims 1 to 5, further comprising:a communication hole (53) extending from the bearing portion (30) to the inlet passage (22) along a radial direction of the rotary shaft (50).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014052254A JP2015175289A (en) | 2014-03-14 | 2014-03-14 | electric pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2918839A1 EP2918839A1 (en) | 2015-09-16 |
EP2918839B1 true EP2918839B1 (en) | 2016-08-24 |
Family
ID=52477600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15154648.8A Not-in-force EP2918839B1 (en) | 2014-03-14 | 2015-02-11 | Electric pump |
Country Status (3)
Country | Link |
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EP (1) | EP2918839B1 (en) |
JP (1) | JP2015175289A (en) |
CN (1) | CN204572453U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11988218B2 (en) | 2021-03-10 | 2024-05-21 | Multi Parts Supply Usa, Inc. | Electric coolant pump with expansion compensating seal |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109113957B (en) * | 2017-06-26 | 2020-10-23 | 比亚迪股份有限公司 | Electric oil pump assembly, steering system and lubricating system |
DE102017218285B4 (en) * | 2017-10-12 | 2021-08-26 | Vitesco Technologies GmbH | Fuel pump and fuel delivery unit |
DE102018217180A1 (en) * | 2018-10-08 | 2020-04-09 | Continental Automotive Gmbh | Fluid pump, water delivery unit, water injection system, internal combustion engine and vehicle |
CN111520320B (en) * | 2020-04-30 | 2022-02-15 | 中国航发哈尔滨东安发动机有限公司 | Method for assembling long pin of cycloid pump and cycloid pump |
CN116241458A (en) * | 2021-12-07 | 2023-06-09 | 安徽威灵汽车部件有限公司 | Pump assembly and vehicle |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5253158A (en) * | 1975-10-25 | 1977-04-28 | Kubota Ltd | Oil pump of internal combustion engine |
US4586885A (en) * | 1983-03-08 | 1986-05-06 | Parker-Hannifin Corporation | Compact high torque hydraulic motors |
JPH0442541Y2 (en) * | 1986-04-14 | 1992-10-07 | ||
JPH08219030A (en) * | 1995-02-08 | 1996-08-27 | Kubota Corp | Gear pump |
JP4048601B2 (en) * | 1998-05-28 | 2008-02-20 | 株式会社島津製作所 | Hydraulic gear pump or motor |
KR101902008B1 (en) * | 2007-08-30 | 2018-09-28 | 마이크로펌프, 아이엔씨. | Pumps and pump―heads comprising internal pressure―absorbing member |
JP5141956B2 (en) * | 2007-12-25 | 2013-02-13 | アイシン精機株式会社 | Electric pump |
US8182235B2 (en) * | 2008-11-25 | 2012-05-22 | Toyota Motor Engineering & Manufacturing North America, Inc. | Multi-drive fluid pump |
JP2012189015A (en) | 2011-03-11 | 2012-10-04 | Jtekt Corp | Electric pump unit |
JP2012207637A (en) * | 2011-03-30 | 2012-10-25 | Hitachi Automotive Systems Ltd | Electric oil pump |
-
2014
- 2014-03-14 JP JP2014052254A patent/JP2015175289A/en active Pending
-
2015
- 2015-02-11 EP EP15154648.8A patent/EP2918839B1/en not_active Not-in-force
- 2015-03-12 CN CN201520141227.8U patent/CN204572453U/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11988218B2 (en) | 2021-03-10 | 2024-05-21 | Multi Parts Supply Usa, Inc. | Electric coolant pump with expansion compensating seal |
Also Published As
Publication number | Publication date |
---|---|
CN204572453U (en) | 2015-08-19 |
JP2015175289A (en) | 2015-10-05 |
EP2918839A1 (en) | 2015-09-16 |
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