CN210461053U - Pump device - Google Patents

Pump device Download PDF

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Publication number
CN210461053U
CN210461053U CN201790001291.3U CN201790001291U CN210461053U CN 210461053 U CN210461053 U CN 210461053U CN 201790001291 U CN201790001291 U CN 201790001291U CN 210461053 U CN210461053 U CN 210461053U
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China
Prior art keywords
pump
stator
rotor
shaft
flow path
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Application number
CN201790001291.3U
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Chinese (zh)
Inventor
本间和博
伊东阳介
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Nidec Tosok Corp
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Nidec Tosok Corp
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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
    • 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
    • F04C2/10—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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Abstract

The pump device (1001) is provided with a shaft (41), a motor unit (2001) for rotating the shaft (41), and a pump unit (300) which is driven by the motor unit (2001) via the shaft (41) and discharges oil. A pump device (1001) is provided with: a 1 st flow path for sucking oil from a suction port (1402c) of a motor unit (2001); a 2 nd flow path provided at a position radially inward of the outer peripheral surface of the stator (5000); a 3 rd flow path provided between the stator (5000) and the rotor (4001); and a 4 th channel, the 4 th channel being connected from the 3 rd channel to a negative pressure region in the pump section (300), the pump section (300) discharging the oil flowing from the 4 th channel to the pump section (300) from the discharge port (32 d).

Description

Pump device
Technical Field
The utility model relates to a pump device.
Background
In recent years, electric oil pumps used in transmissions and the like are required to have responsiveness. In order to achieve responsiveness of the electric oil pump, the motor for the electric oil pump needs to be set to a high output.
When the motor for the electric oil pump is set to a high output, a large current flows through the coil of the motor, the motor becomes high in temperature, and the permanent magnet of the motor is demagnetized, for example. Therefore, in order to suppress the temperature rise of the motor, a cooling structure needs to be provided in the motor.
Patent document 1 discloses an electric motor having an oil supply mechanism for cooling a rotor by oil while changing a relative positional relationship in an axial direction between a stator and the rotor by a hydraulic pressure of the oil according to a rotation speed of the rotor.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2008-125235
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved by the utility model
However, the electric motor disclosed in patent document 1 cannot simultaneously cool the stator and the rotor with oil.
An object of the utility model is to provide a cool off stator and rotor simultaneously to have the pump unit of the higher structure of cooling effect.
Means for solving the technical problem
An exemplary pump device of utility model 1 of the present application has: a shaft that rotates centering on a central axis extending in an axial direction; a motor section that rotates the shaft; and a pump section that is located on one side in an axial direction of the motor section, and that discharges oil by being driven by the motor section via the shaft, the motor section including: a rotor that rotates around the shaft; a stator disposed opposite to the rotor; a housing accommodating the rotor and the stator; and a suction port provided in the casing, the suction port sucking the oil, the pump section including: a pump rotor mounted to the shaft; a pump housing that houses the pump rotor; and a discharge port provided in the pump housing, the discharge port discharging the oil, the pump device including: a 1 st flow path that sucks in the oil from a suction port of the motor unit; a 2 nd flow path provided at a position radially inward of an outer peripheral surface of the stator; a 3 rd flow path provided between the stator and the rotor; and a 4 th channel connected from the 3 rd channel to a negative pressure region in the pump portion, wherein the pump portion discharges the oil flowing from the 4 th channel to the pump portion from the discharge port.
Effect of the utility model
According to illustrative utility model 1 of the present application, a pump device that simultaneously cools a stator and a rotor and has a structure with a high cooling effect can be provided.
Drawings
Fig. 1 is a sectional view showing a pump device according to embodiment 1.
Fig. 2 is a view of the pump body viewed from the axial front side.
Fig. 3 is a plan view of the stator in embodiment 1.
Fig. 4 is a diagram showing a modification of the flow path in embodiment 1.
Fig. 5 is a sectional view showing the pump device according to embodiment 2.
Fig. 6 is a sectional view showing the pump device according to embodiment 3.
Fig. 7 is a sectional view showing the pump device according to embodiment 4.
Detailed Description
Hereinafter, a pump device according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. In the following drawings, in order to easily understand each structure, the actual structure may be different from the scale, the number, and the like of each structure.
In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional rectangular coordinate system. In the XYZ coordinate system, the Z-axis direction is assumed to be a direction parallel to one axial direction of the central axis J shown in fig. 1. Let the X-axis direction be the left-right direction in fig. 1. The Y-axis direction is perpendicular to both the X-axis direction and the Z-axis direction.
In the following description, the positive side (+ Z side) in the Z-axis direction is referred to as "front side", and the negative side (-Z side) in the Z-axis direction is referred to as "rear side". The rear side and the front side are names used for explanation only, and do not limit the actual positional relationship and direction. Note that unless otherwise noted, a direction parallel to the central axis J (Z-axis direction) is simply referred to as "axial direction", a radial direction about the central axis J is simply referred to as "radial direction", and a circumferential direction about the central axis J, that is, a direction of an axis around the central axis J (θ direction) is simply referred to as "circumferential direction".
In the present specification, the term "extend in the axial direction" includes not only a case where the extend is strictly in the axial direction (Z-axis direction), but also a case where the extend is in a direction inclined by less than 45 ° with respect to the axial direction. In the present specification, the term "extend in the radial direction" includes not only a case where the extend is strictly in the radial direction, i.e., a direction perpendicular to the axial direction (Z-axis direction), but also a case where the extend is in a direction inclined by less than 45 ° with respect to the radial direction.
Embodiment 1
Fig. 1 is a sectional view of a pump device 1001 according to the present embodiment.
The pump device 1001 includes a shaft 41, a motor 2001, and a pump 300. The shaft 41 rotates about a central axis J extending in the axial direction. The motor section 2001 and the pump section 300 are arranged side by side in the axial direction.
< Motor part >
As shown in fig. 1, the motor 2001 includes a housing 1402, a rotor 4001, a stator 5000, a bearing housing 6502, an upper bearing member 421, a lower bearing member 422, a control device (not shown), and a bus bar assembly (not shown). The control device and the bus bar assembly may be mounted on, for example, one end of the rear side in the axial direction of the housing 1402, or may be mounted on a side surface of the housing 1402, without being built into the motor 2001.
The rotor 4001 includes a rotor magnet 4402 and a rotor yoke 4302. The rotor yoke 4302 has a cup shape with a rear-side opening. The rotor yoke 4302 includes: a disc-shaped top plate 4302b having a shaft 41 connected to the center thereof; and a cylindrical portion 4302a provided so that the outer periphery of the top plate portion 4302b extends rearward. The rotor magnet 4402 is disposed on the inner circumferential surface of the cylindrical portion 4302a of the rotor yoke 4302, and the inner circumferential surface of the rotor magnet 4402 faces the stator 5000 in the radial direction. The rotor 4001 is fixed to the shaft 41.
The bearing housing 6502 has: a bearing-housing cylindrical portion 6502b having a cylindrical shape; an annular projecting portion 6502a provided on the inner peripheral surface of the bearing housing cylindrical portion 6502 b; and a flange portion 6502 c provided on the outer peripheral surface of the bearing housing cylindrical portion 6502 b. The annular protruding portion 6502a protrudes inward so as to reduce the inner diameter of the bearing housing cylindrical portion 6502 b.
A lower bearing member 422 is provided on the rear side of the inner peripheral surface of the bearing housing cylindrical portion 6502 b. An upper bearing member 421 is provided on the front side of the bearing housing cylindrical portion 6502 b. The upper bearing member 421 and the lower bearing member 422 are fitted to the shaft 41, respectively. The upper bearing member 421 and the lower bearing member 422 rotatably support the shaft 41 with respect to the bearing housing 6502.
Further, instead of providing the lower bearing member 422, the housing 1402 may have a sliding bearing structure (bearing member). When the suction port 1402c is positioned at the bottom portion (1402b) of the housing 1402 and the bearing member (slide bearing structure) is positioned between the shaft 41, that is, the oil sucked from the suction port 1402c can be used as lubricating oil in the 1 st flow path 1, and the oil can be efficiently sucked into the motor 2001.
The stator 5000 is fixed to the outer periphery of the bearing housing 6502. Specifically, the bearing housing 6502 is fitted to the inner circumferential surface of an annular core back portion (not shown) of the stator 5000. A bottom wall 1402b of the housing 1402 is disposed on the rear side of the stator 5000, and supports the bearing housing 6502. The control device (not shown) is disposed between the bottom wall 1402b of the housing 1402 and the stator 5000.
The housing 1402 has a suction port 1402 c. The suction port 1402c sucks the oil discharged from the discharge port 32d by the pump section 300. In the example shown in fig. 1, the suction port 1402c is provided in the cylindrical portion 1402a (housing side surface). Specifically, the suction port 1402c is located between the cylindrical portion 1402a of the housing 1402 (the side surface of the housing) and one end of the stator on the opposite side to the pump portion in the axial direction (the rear end of the stator 5000) and the rear end (the bottom) of the housing 1402.
By providing the suction port 1402c at the above position, the oil can smoothly flow to the 2 nd flow path in the motor unit 2001 described later. That is, an optimal flow path can be provided, and oil can be efficiently distributed throughout the entire stator 5000. Therefore, the stator 5000 can be efficiently cooled.
The position of the suction port 1402c is not limited to this. The suction port 1402c may be provided at any position of the housing 1402. For example, the suction port 1402c may be provided in the bottom wall (bottom) 1402b of the housing 1402 (bottom of the housing 1402).
When the suction port 1402c is provided at the bottom of the housing 1402 and between the bearing housing 6502 and the shaft 41, a 2 nd flow path described later can pass through any of a portion between the lower bearing member 422 and the bearing housing 6502, a portion between the lower bearing member 422 and the shaft 41, and an inner portion of the lower bearing member 422. The outer peripheral surface of the shaft 41 may have a cutout portion, and when the 4 th flow path passes through a portion between the lower bearing member 422 and the shaft 41, the flow rate of the oil flowing into the 4 th flow path can be increased by the cutout portion. The position of the suction port 1402c may be determined according to the position of an external device to which the pump device 1001 is attached.
For example, a case where the pump device 1001 is mounted in a Transmission such as a CVT (continuously variable Transmission) in the following configuration is considered. The pump device 1001 is disposed horizontally in the axial direction, and the pump device 1001 is disposed such that the positive side in the X-axis direction (+ X side) is located above the shaft 41 and the negative side in the X-axis direction (-X side) is located below the shaft 41.
The oil discharged from the discharge port 32d of the pump unit 300 flows into the motor unit 2001 via the CVT and the suction port 1402c of the motor unit 2001, and returns to the pump unit 300. In this oil circulation, when the oil flow path from the CVT to the motor 2001 is positioned on the upper side (+ Z) in the arrangement of the pump device 1001, the suction port 1402c is similarly provided on the upper side. The oil sucked from the suction port 1402c can circulate in the entire motor 2001 by flowing in the gravity direction, and therefore the oil can be circulated more efficiently. Further, depending on the arrangement of the pump device 1001, the suction port 1402c may be positioned on the lower side (-X side) with respect to the shaft 41.
The number of the suction ports 1402c is not limited to 1, and may be plural. By providing the plurality of suction ports 1402c, more oil can be flowed into (sucked into) the motor portion 2001. Therefore, even when the discharge amount of the oil from the pump is large, the optimum suction amount can be secured to the inside of the motor. By ensuring the optimum amount of oil sucked, the stator and the rotor can be optimally cooled in a cooling structure described later.
< Pump part >
The pump section 300 is located on one axial side, specifically, the front side (+ Z axis side) of the motor section 2001. The pump section 300 is driven by the motor section 2001 via the shaft 41. The pump section 300 has a pump housing and a pump rotor 351. The pump housing has a pump body 311 and a pump cover 321. Hereinafter, the pump body 311 and the pump cover 321 are referred to as a pump housing.
The pump body 311 has a pump chamber 331 that is recessed from the face of the front side (+ Z side) toward the rear side (-Z side) and accommodates a pump rotor 351. The pump chamber 331 has a circular shape when viewed from the axial direction. The pump body 311 has a through hole 311a, the through hole 311a being open at both ends in the axial direction, the shaft 41 passing through the through hole 311a, and the opening at the front side of the through hole 311a being open to the pump chamber 331. The rear opening of the through hole 311a is open toward the motor 2001. The through hole 311a functions as a bearing member that rotatably supports the shaft 41.
The pump section 300 is a positive displacement pump that pumps oil by expanding and contracting the volume of a sealed space (oil chamber), and in the present embodiment, is a trochoid pump. Fig. 2 is a view of the pump body 311 viewed from the axial front side. The pump rotor 351 is mounted to the shaft 41. More specifically, the pump rotor 351 is attached to the front end of the shaft 41. The pump rotor 351 has an inner rotor 371 attached to the shaft 41 and an outer rotor 381 surrounding the radially outer side of the inner rotor 371. The inner rotor 371 is annular. The inner rotor 371 is a gear having teeth on the radially outer side.
The inner rotor 371 is fixed to the shaft 41. More specifically, the front end of the shaft 41 is pressed into the inner rotor 371. The inner rotor 371 rotates in the direction of the shaft (θ direction) together with the shaft 41. The outer rotor 381 has an annular shape surrounding the radially outer side of the inner rotor 371. The outer rotor 381 is a gear having teeth on the radially inner side. The outer rotor 381 is rotatably accommodated in the pump chamber 331. An inner receiving chamber 391 for receiving the inner rotor 371 is formed in the outer rotor 381, and the inner receiving chamber 391 is formed in a star shape. The inner rotor 371 is rotatably accommodated in the inner accommodation chamber 391.
The number of internal teeth of the outer rotor 381 is set to be larger than the number of external teeth of the inner rotor 371. The inner rotor 371 and the outer rotor 381 are engaged with each other, and when the inner rotor 371 is rotated by the shaft 41, the outer rotor 381 rotates along with the rotation of the inner rotor 371. That is, the pump rotor 351 is rotated by the rotation of the shaft 41. In other words, the motor section 2001 and the pump section 300 have the same rotation axis. This can suppress the electric oil pump from being increased in size in the axial direction.
By the rotation of the inner rotor 371 and the outer rotor 381, the volume of the space formed between the inner rotor 371 and the outer rotor 381 changes according to the rotational position thereof. The pump rotor 351 is configured to be able to suck oil from the suction port 74 by a volume change, pressurize the sucked oil, and discharge the oil from the discharge port 75. In the present embodiment, a region in which the volume becomes large (oil is sucked) in the space formed between the inner rotor 371 and the outer rotor 381 is defined as a negative pressure region.
The pump unit 300 is not limited to a trochoid pump, and may be a pump of another type as long as it is a positive displacement pump that pumps and feeds oil by expanding and contracting the volume of a sealed space (oil chamber). For example, pump section 300 may be a vane pump. When the pump unit 300 is a vane pump, a cylindrical rotor (not shown) fixed to the shaft 41 is accommodated in the pump chamber 331. The rotor (not shown) has a plurality of slots and vanes slidably mounted in the slots. By disposing the outer periphery of the rotor eccentrically with respect to the inner periphery of the pump chamber 331, a crescent-shaped space is created between the pump chamber 331 and the rotor.
The crescent-shaped space generated between the pump chamber 331 and the rotor is divided into a plurality of regions by the grooves attached to the rotor. The rotor rotates and the vanes attached to the grooves move forward and backward, so that the volume of each region changes according to the rotational position. As in the case of the trochoid pump, oil can be sucked from a suction port (not shown) by utilizing the volume change, and the sucked oil can be pressurized and discharged from a discharge port (not shown). Of the respective regions formed between the rotor and the pump chamber 331, a region in which the volume is increased (oil is sucked) is a negative pressure region.
The pump cover 321 is attached to the front side of the pump body 311. The pump cover 321 has a pump cover main body 321a and a pump discharge cylindrical portion 321 b. The pump housing main body 321a has a radially expanded disk shape. The pump cover body 321a closes the opening on the front side of the pump chamber 331. The pump discharge cylindrical portion 321b is cylindrical and extends in the axial direction. The pump discharge cylindrical portion 321b is open at both axial ends. The pump discharge cylindrical portion 321b extends rearward from the pump cover main body 321 a.
The pump section 300 has a discharge port 32 d. The discharge port 32d is provided in the pump cover 321. The discharge port 32d includes the inside of the pump discharge cylinder 321 b. The discharge port 32d opens on the front surface of the pump cover 321. The discharge port 32d is connected to a discharge port 75 (see fig. 2) of the pump chamber 331, and can discharge oil from the pump chamber 331.
The oil sucked from the suction port 1402c of the motor unit 2001 is sucked into the pump chamber 331 of the pump unit 300 through a flow path described later. The oil sucked into the pump chamber 331 is sent by the pump rotor 351 and discharged from the discharge port 32 d.
Next, a cooling structure provided in the pump device 1001 according to the present embodiment will be described. According to the present embodiment, the oil supplied to the pump chamber 331 is discharged from the discharge port 32d by the pump rotor 351, circulates in the motor unit 2001 through the external device and the suction port 1402c of the motor unit 2001, and cools the stator 5000 and the rotor 4001 at the same time. The oil circulating in the motor 2001 returns to the pump chamber 331, and the pump rotor 351 discharges the oil returning from the motor 2001 from the discharge port 32 d.
According to the present embodiment, since the circulation of the oil from the pump section to the motor section can be made a series of flow paths, the stator and the rotor can be cooled at the same time without lowering the pump efficiency.
As shown in fig. 1, the pump device 1001 includes: a 1 st channel 1 for sucking oil from a suction port 1402c of the motor 2001; a 2 nd flow path 2 provided radially inward of the outer peripheral surface of the stator 5000; a 3 rd flow channel 3 provided between the stator 5000 and the rotor 4001; and a 4 th channel 4 connected from the 3 rd channel 3 to the negative pressure region in the pump section 300. The pump section 300 discharges the oil flowing from the 4 th channel 4 to the pump chamber 331 from the discharge port 32 d. The details of each flow path will be described below.
< flow path 1 >
The 1 st flow channel 1 in fig. 1 is connected to the motor 2001 from the suction port 1402c of the casing 1402, and is located between the rear end of the stator 5000 and the bottom wall 1402b of the casing 1402. The 1 st channel 1 differs depending on the position of the suction port 1402 c.
The position of the suction port 1402c is not limited to the position shown in fig. 1, and may be provided at any position on the side surface of the housing 1402 or the bottom wall 1402b of the housing 1402, as described above. An example in which the suction port 1402c is provided in the bottom wall 1402b of the housing 1402 will be described later with reference to fig. 4.
< 2 nd flow path >
The 2 nd flow channel 2 in fig. 1 is a flow channel provided radially inward of the outer peripheral surface of the stator 5000. In the example shown in fig. 1, the 2 nd flow channel 2 is provided between the inner peripheral surface of the stator 5000 and the shaft 41. Specifically, the stator 5000 is provided between the inner circumferential surface of the core back 51 (see fig. 3) and the bearing housing 6502.
Fig. 3 is a rear view of the stator 5000 and the bearing housing 6502. As shown in fig. 3, the 2 nd flow channel 2 may be provided between a notch 51a provided on the inner peripheral surface of the core back 51 and the bearing housing 6502.
Instead of the notch 51a, a notch 6502d may be provided on the outer peripheral surface of the bearing housing 6502, and both the notch 51a and the notch 6502d may be provided. The oil flowing into the 2 nd flow path 2 flows from the rear side to the front side and is connected to the 3 rd flow path 3.
The 2 nd flow channel 2 is not limited to the space between the outer peripheral surface of the stator 5000 and the outer peripheral surface of the bearing housing 6502. For example, as shown in fig. 3, a through hole 52b may be provided in the core back 51 of the stator 5000, and the through hole 52b may be used as the 2 nd flow channel 2. Further, the adjacent teeth 52 of the plurality of teeth 52 arranged apart from each other in the core back 51 may be used as the 2 nd flow path 2. Another example of the 2 nd channel 2 will be described later with reference to fig. 4.
When the adjacent teeth 52 are used as the 2 nd flow path 2, a ring member (not shown) may be provided between the stator 5000 and the rotor 4001. By using the ring member, the oil flowing between the teeth 52 as the 2 nd flow path 2 and the oil flowing between the stator 5000 and the rotor 4001 as the 3 rd flow path 3 do not merge, and therefore the oil can be efficiently circulated in the motor unit 2001. By using the through-hole 52b of the core back 51, the cutout 51a, or the gap between the adjacent tooth portions 52 as a flow path for oil, the surface area of the stator 50 in contact with oil can be increased, and therefore, the coils 5301 of the stator 5000 can be cooled more efficiently. Generally, the coil generates the most heat in the motor. The heat generated by the coil is transmitted to the core back 51 and the tooth 52. That is, the motor 2001 generates a large amount of heat from the stator 5000. This means that the motor unit 2001 can be cooled efficiently by cooling the stator 5000 efficiently.
In the present embodiment, a ring member 6503 is provided to connect the rear coil end of the stator 5000 to the side surface of the housing 1402. Thus, the 1 st channel 1 and the channel connected from the 3 rd channel 3 to the 4 th channel 4 do not overlap with each other, and therefore the oil flowing into the 1 st channel 1 can smoothly flow to the 2 nd channel 2. That is, the oil flowing from the 1 st channel 1 into the motor 2001 is returned from the 4 th channel 4 into the pump 300 without passing through an unnecessary circulation path. An optimal flow path can be provided, and oil can be efficiently distributed throughout the entire stator 5000. Therefore, the interior of the motor 2001 can be efficiently cooled.
< flow path 3 >
The 3 rd flow channel 3 in fig. 1 is provided between the stator 5000 and the rotor 4001. In the example shown in fig. 1, the 3 rd flow channel 3 is located between the outer peripheral surface of the stator 5000 and the inner peripheral surface of the rotor 4001. The oil flowing from the 2 nd flow path 2 into the 3 rd flow path 3 flows from the front end to the rear end of the 3 rd flow path 3.
The 3 rd flow channel 3 is not limited to the space between the outer peripheral surface of the stator 5000 and the inner peripheral surface of the rotor 4001. For example, as shown in fig. 3, a through hole 52b or a notch 51a may be provided in the core back 51 of the stator 5000, and the through hole 52b or the notch 51a may be used as the 3 rd flow path. The 3 rd flow channel 3 may be formed between a plurality of tooth portions 52 (between adjacent teeth) disposed apart from each other in the core back 51. By using the through-hole 52b of the core back 51, the cutout 51a, or the space between the adjacent tooth portions 52 as a flow path for oil, the coils 5301 of the stator 5000 can be cooled more efficiently, and the rotor can be cooled.
Similarly, a through hole (not shown) or a cutout (not shown) may be provided in the rotor yoke 4302, and the through hole or the cutout may be used as the 3 rd flow path. By using the through-hole or the notch portion of the rotor yoke 4302 as a flow path, the rotor 4001 can be cooled more efficiently, and demagnetization of the rotor magnet 4402 can be suppressed. That is, the 3 rd flow channel 3 may be provided at any position as long as it is between the stator 5000 and the rotor 4001.
< flow path 4 >
The 4 th channel 4 in fig. 1 is a channel provided in the pump body 311 and connected from the 3 rd channel to the negative pressure region in the pump section 300. Specifically, the 4 th flow path 4 has a 1 st opening 311c at the rear end of the pump 311, and a 2 nd opening 311d in the vicinity of the negative pressure region of the pump chamber 331.
By providing the 4 th channel 4, the oil sucked into the motor 2001 through the suction port 1402c can circulate from the inside of the motor 2001 to the inside of the pump 300. This enables efficient cooling of stator 5000 and rotor 4001. The position of the 1 st opening 311c is not limited to the position shown in fig. 1, and may be provided at any position as long as it is the rear end of the pump body 311.
The sectional area of the 1 st opening 311c, which is the rear opening of the 4 th channel 4, is smaller than the sectional area of the discharge port 32d of the pump section 300. Therefore, the amount of oil flowing from the motor 2001 into the pump 300 is smaller than the discharge amount of the pump, and the amount of oil flowing into the negative pressure region can be suppressed from becoming excessive. Therefore, the pump efficiency can be suppressed from decreasing due to an excessive amount of oil flowing into the negative pressure region.
In the present embodiment, the stator 5000 may be an integrally molded product made of resin. When the stator 5000 is an integrally molded product made of resin, the surface area of the stator 5000 in contact with oil in the 2 nd flow path 2 and the 3 rd flow path 3 can be increased. Therefore, the interior of the motor 2001 can be cooled more efficiently. As with the stator 5000, the rotor 4001 may be an integrally molded product made of resin. By molding the rotor 4001, the surface area of the 3 rd flow path 3 in which the rotor 4001 contacts the oil can be increased, and therefore demagnetization of the rotor magnet 4402 can be suppressed, and the motor 2001 can be cooled more efficiently.
< modification of flow channel >
In the example shown in fig. 1, the suction port 1402c is provided on a side surface of the housing 1402. However, the position of the suction port 1402c is not limited thereto. For example, the suction port may be provided in the bottom wall (bottom) 1402b of the housing 1402. Fig. 4 is a diagram showing the flow paths when the suction port is provided at the bottom of the housing 1402 and between the bearing housing 6502 and the shaft 41.
As shown in fig. 4, the 1 st flow path 1 is located between the shaft 41 and the bearing housing 6502 from the suction port 1402 b. The 2 nd channel passes through at least any part of the following 2 nd to 2 nd channels 2a to 2 d. The 2 nd flow path 2a is located between the bearing housing 6502 and the lower bearing member (1 st bearing member) 422. The 2 nd flow path 2b is a flow path passing through the inside of the lower bearing member (1 st bearing member) 422. For example, in the case where the lower bearing member 422 is a ball bearing, the 2 nd flow path 2b is located between adjacent balls.
The 2 nd flow path 2c is located between the lower bearing member (1 st bearing member) 422 and the shaft 41. For example, the pump unit 300 may have a slide bearing structure instead of the lower bearing member 422. In this case, the 2 nd flow path 2c is located between the bearing member and the shaft 41. The 2 nd flow path 2d is located between the shaft 41 and the bearing housing 6502. As in the case of the lower bearing member 422, the oil that has flowed into the 2 nd flow path 2d flows through at least any one of the 2 nd to 2 nd flow paths 2a to 2 nd flow path 2c of the upper bearing member 421 and flows into the 3 rd flow path 3.
According to the present embodiment, the pump device 1001 includes: a shaft 41 that rotates about a central axis extending in the axial direction; a motor unit 2001 for rotating the shaft 41; and a pump section 300 located on one axial side of the motor section 2001 and driven and discharged through the motor section 2001 via a shaft 41. The motor unit 2001 has: a rotor 4001 that rotates around the shaft 41; a stator 5000 disposed opposite to the rotor 4001; a housing 1402 accommodating the rotor 4001 and the stator 5000; and a suction port 1402c provided in the housing 1402 for sucking oil. The pump section 300 has: a pump rotor 351 attached to the shaft 41; pump housings (311 and 321) that accommodate the pump rotors 351; and a discharge port 32d provided in the pump housing (311 and 321) and discharging oil. The pump device 1001 includes: a 1 st channel for sucking oil from the suction port 1402c of the motor 2001; a 2 nd flow path provided radially inward of the outer peripheral surface of the stator 5000; a 3 rd flow path provided between the stator 5000 and the rotor 4001; and a 4 th channel connected from the 3 rd channel to a negative pressure region in the pump section 300, and the pump section 300 discharges the oil flowing from the 4 th channel to the pump section 300 from the discharge port 32 d.
According to the present embodiment, the oil discharged from the discharge port 32d by the pump rotor 351 and passed through the external device circulates in the motor unit 2001 through the suction port 1402c of the motor unit 2001, and cools the stator 5000 and the rotor 4001 at the same time. The oil circulating in the motor 2001 returns to the pump chamber 331, and the pump rotor 351 discharges the oil returned from the motor 2001 from the discharge port 32 d. Therefore, since the circulation of the oil from the pump unit 300 to the motor unit 2001 can be made a series of flow paths, the oil can be circulated in the motor unit 2001 without lowering the pump efficiency, and the stator 5000 and the rotor 4001 can be cooled at the same time. Further, by providing the 2 nd flow path 2, the surface area of the stator 5000 in contact with the oil can be increased. Thus, the stator 5000 can be cooled more efficiently.
Embodiment 2
Next, a pump device according to embodiment 2 of the present invention will be described. In embodiment 1, the motor unit has a structure of an outer rotor type motor in which a stator is located radially inside a rotor. In contrast, the motor unit in the present embodiment has a structure of an axial gap motor in which a stator is disposed to face a rotor in an axial direction. Hereinafter, the following description will be made centering on differences from embodiment 1. In the pump device according to the present embodiment, the same components as those of the pump device according to embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.
Fig. 5 is a sectional view showing the pump device 100 of the present embodiment.
As shown in fig. 5, pump device 100 includes shaft 41, motor unit 200, casing 141, and pump unit 300. The shaft 41 rotates about a central axis J extending in the axial direction. The motor section 200 and the pump section 300 are arranged side by side in the axial direction.
The motor unit 200 includes a rotor 401, a stator 501, an upper bearing member (2 nd bearing member) 421, a lower bearing member (1 st bearing member) 422, a control device (not shown), a bus bar assembly (not shown), and a connector (not shown). The rotor 401 has a disk shape extending in the radial direction. The rotor 401 includes a plurality of magnets 441 arranged in the circumferential direction on a surface (Z-side surface) facing the stator 501, and a rotor yoke 431 holding the magnets 441.
That is, the magnet 441 is disposed to face the axial front end of the stator 501. Rotor yoke 431 is fixed to the outer peripheral surface of shaft 41.
The upper bearing member 421 and the lower bearing member 422 rotatably support the shaft 41. The upper bearing member (2 nd bearing member) 421 and the lower bearing member (1 st bearing member) 422 are fixed to the bearing housing 630. The stator 501 includes: a plurality of cores arranged in the circumferential direction and having a fan shape in a plan view; a coil provided to each iron core; coil lead-out wires led out from the coils of the iron cores; a molded resin integrally fixed to the plurality of cores; and a plurality of lead wire support portions provided at the outer circumferential end of the stator 50.
The housing 141 constitutes a housing of the motor unit 200. Further, the control device (not shown) and the bus bar assembly (not shown) may be housed on the rear side (-Z side) of the stator. The rotor 401 is accommodated at the front side (+ Z side) of the stator 501. The housing 141 includes a 1 st housing 121 having a cylindrical shape with a lid opened at the rear side and a 2 nd housing (cover) 131 having a cylindrical shape with a bottom connected to the rear side (-Z side) of the 1 st housing 121. The material of the housing 141 is, for example, metal or resin.
The 1 st housing 121 has a disk-shaped top wall 121a, and the shaft 41 passes through a central portion of the top wall 121 a. The upper bearing holding portion 651 is fitted to the rear opening portion of the pump portion 300. The upper bearing holding portion 651 holds the upper bearing member 421.
The 2 nd housing 131 has a disk-shaped bottom wall 131a and a cover cylindrical portion 131b extending from the peripheral edge of the bottom wall 131a toward the front side (+ Z side). A bearing housing 630 is connected to a central portion of the bottom wall 131 a. The bearing housing 630 holds an upper bearing member 421 and a lower bearing member 422. The positions of the upper bearing member 421 and the lower bearing member 422 are not limited to the positions shown in fig. 4, and may be changed.
For example, instead of the motor section 200 having the upper bearing member 421, the pump section 300 may have the upper bearing member 421. The cover cylindrical portion 131b is fixed to the rear (-Z side) opening of the 1 st housing 121. More specifically, the 1 st chassis 121 and the 2 nd chassis 131 are fixed by fastening with bolts or the like using the flange portions 111 and 112 of the 2 nd chassis 131 and the flange portions 113 and 114 of the 1 st chassis 121.
When the control device (not shown) and the bus bar assembly (not shown) are housed in the 2 nd housing 131, a through hole (not shown) that penetrates in the axial direction is provided in the bottom wall 131a of the 2 nd housing 131, and a connector (not shown) is attached to the through hole. An external connection terminal (not shown) is disposed in the connector, penetrating the bottom wall 131a from the bus bar assembly and extending to the rear side (-Z side).
The housing 141 has a suction port 141 a. The suction port 141a sucks the oil discharged from the discharge port 32d by the pump section 300. In the example shown in fig. 5, the suction port 141a is provided in the cylindrical portion 121b (the housing side surface). Specifically, the suction port 141a is located between the cylindrical portion 121b of the 1 st housing 121 (the side surface of the housing) and one end of the stator on the opposite side to the pump portion in the axial direction (the rear end portion of the stator 501) and the rear end portion of the housing 141 (the bottom portion, the bottom wall 131a of the 2 nd housing 131).
By providing the suction port 141a at the above position, oil can smoothly flow to the 2 nd flow path in the motor unit 200 described later. That is, an optimal flow path can be provided, and oil can be efficiently distributed throughout the entire stator 501. Therefore, the stator 501 can be efficiently cooled.
The position of the suction port 141a is not limited to this. The suction port 141a may be provided at any position of the casing 141. For example, suction port 141a may be provided in bottom wall 131a of case 2 (bottom of case 141). The flow path when suction port 141a is provided at the bottom of casing 141 is the same as that in embodiment 1 (fig. 4). As in embodiment 1, the position of the suction port 141a may be determined according to the position of an external device to which the pump device 100 is attached. As in embodiment 1, the number of the suction ports 141a is not limited to 1, and may be plural.
The pump section 300 is located on one axial side, specifically, the front side (+ Z axis side) of the motor section 200. The pump section 300 is driven by the motor section 200 via the shaft 41. Pump section 300 includes pump body 311, pump rotor 351, and pump cover 321. The pump rotor 351 has an inner rotor 371 and an outer rotor 381.
The pump cover 321 has a discharge port 32 d. As in embodiment 1, the pump section 300 is a positive displacement pump, and in this embodiment, is a trochoid pump. The pump unit 300 is not limited to the trochoid pump, and may be a pump of another type as long as it is a displacement type pump. The description of the components of pump unit 300 is the same as that of embodiment 1, and therefore, the description thereof is omitted.
Next, a cooling structure provided in the pump device 100 according to the present embodiment will be described. According to the present embodiment, as in embodiment 1, the oil supplied to the pump chamber 331 is discharged from the discharge port 32d by the pump rotor 351, passes through the external device, circulates in the motor unit 200 through the suction port 141a of the motor unit 200, and cools the stator 501 and the rotor 401. The oil circulating in the motor unit 200 returns to the pump chamber 331, and the pump rotor 351 discharges the oil returning from the motor unit 200 from the discharge port 32 d. According to the present embodiment, since the circulation of the oil from the pump unit 300 to the motor unit 200 can be made to be a series of flow paths, the stator 501 and the rotor 401 can be cooled at the same time without lowering the pump efficiency. Hereinafter, the flow path of oil in the pump device 100 will be described mainly focusing on the differences from embodiment 1.
As shown in fig. 5, the pump apparatus 100 includes: a 1 st flow path 1 for sucking oil from a suction port 141a of the motor unit 200; a 2 nd flow channel 2 provided radially inward of the outer peripheral surface of the stator 501; a 3 rd flow path 3 provided between the stator 501 and the rotor 401; and a 4 th channel 4 connected from the 3 rd channel 3 to the negative pressure region in the pump section 300. The pump section 300 discharges the oil flowing from the 4 th channel 4 to the pump chamber 331 from the discharge port 32 d.
The 1 st channel and the 2 nd channel in the present embodiment are the same as those in embodiment 1, and therefore, description thereof is omitted. In the present embodiment, as shown in fig. 5, the 3 rd flow channel 3 is located between the rotor 401 and one end of the stator 501 in the axial direction facing the magnet 441 of the rotor 401.
In the present embodiment, the stator 501 and the rotor 401 may be integrally molded from resin, as in embodiment 1. When the stator 501 or the rotor 401 is an integrally molded product made of resin, the surface area of the stator 501 or the rotor 401 in contact with oil can be increased. Therefore, the interior of the motor unit 200 can be cooled more efficiently. By increasing the surface area of rotor 401 in contact with the oil, demagnetization of magnet 441 can be suppressed.
According to the present embodiment, the pump apparatus 100 includes: a shaft 41 that rotates about a central axis extending in the axial direction; a motor unit 200 for rotating the shaft 41; and a pump portion 300 located at one side of the motor portion 200 in the axial direction and driven and discharged through the motor portion 200 by means of the shaft 41. The motor unit 200 includes a rotor 401 that rotates around the shaft 41, a stator 501 disposed to face the rotor 401, a casing 141 that houses the rotor 401 and the stator 501, and a suction port 141a that is provided in the casing 141 and sucks oil. The pump section 300 has: a pump rotor 351 attached to the shaft 41; pump housings (311 and 321) that accommodate the pump rotors 351; and a discharge port 32d provided in the pump housing (311 and 321) and discharging oil. The pump device 100 includes: a 1 st channel for sucking oil from the suction port 141a of the motor unit 200; a 2 nd flow path provided radially inward of the outer peripheral surface of the stator 501; a 3 rd flow path provided between the stator 501 and the rotor 401; and a 4 th channel connected from the 3 rd channel to a negative pressure region in the pump section 300, and the pump section 300 discharges the oil flowing from the 4 th channel to the pump section 300 from the discharge port 32 d.
According to the present embodiment, the oil discharged from the discharge port 32d by the pump rotor 351 and passed through the external device circulates inside the motor unit 200 through the suction port 141a of the motor unit 200, and cools the stator 501 and the rotor 401 at the same time. The oil circulating in the motor unit 200 returns to the pump chamber 331, and the pump rotor 351 discharges the oil returning from the motor unit 200 from the discharge port 32 d. Therefore, since the circulation of the oil from the pump unit 300 to the motor unit 200 can be made a series of flow paths, the oil can be circulated in the motor unit 200 without reducing the pump efficiency, and the stator 501 and the rotor 401 can be cooled at the same time. Further, by providing the 2 nd flow path 2, the surface area of the stator 501 in contact with the oil can be increased. Thus, the stator 501 can be cooled more efficiently.
In the present embodiment, the 2 nd flow path 2 is not limited to the 2 nd flow path 2 shown in fig. 5, and may be a flow path provided at a position radially inward of the outer peripheral surface of the stator 501. The 2 nd flow path 2 can be changed depending on the positions of the bearing members (421 and 422) and the suction port 141 a. For example, when the position of suction port 141a is located at the bottom of casing 141 (bottom wall 131a of casing 2) and between bearing housing 630 and shaft 41, at least a part of the following flow paths passes through, as in embodiment 1 (fig. 4).
That is, the 2 nd channel 2 passes through at least a part of any one of the channels located at the following positions: between the bearing housing 630 and the lower bearing member (1 st bearing member) 422; the inside of the lower bearing member (1 st bearing member) 422; between the lower bearing member (1 st bearing member) 422 and the shaft 41; or between the shaft 41 and the bearing housing 630.
Similarly to embodiment 1, the present embodiment also includes the 2 nd flow channel 2, thereby increasing the surface area of the stator 501 in contact with the oil. Therefore, the pump device 100 can more efficiently cool the motor unit 200.
The pump device 100 may have the 5 th channel 5 as another channel. The 5 th flow path 5 is a flow path between the stator 501 and the side surface of the casing 141. By providing the 5 th flow path, the contact area between the stator 501 and the oil can be increased, and therefore the stator 501 can be cooled more efficiently.
In addition, a ring member (not shown) may be used as in embodiment 1 (ring member 6503 in fig. 1) so that the oil in the 1 st channel 1 flows into the 2 nd channel 2 without being branched to the 5 th channel 5. The ring member connects the rear end of the stator 501 with the side of the housing 141. Since the oil flowing into the 1 st channel 1 flows into the 2 nd channel 2 without being split by the ring member, the oil can efficiently flow into the 2 nd channel 2. Thus, the stator 501 and the rotor 401 can be cooled simultaneously more efficiently.
In the pump device 100 of the present embodiment, the stator 501 is fixed to the bearing housing 630, but the present invention is not limited to this. The present invention can be applied even when the stator 501 of the pump apparatus 100 is fixed to the cylindrical portion 121b of the housing 141, and the pump apparatus 100 has a cooling structure by the same flow path.
In the present embodiment, the case where the motor unit 200 of the pump device 100 includes only the rotor 401 has been described, but the present invention is not limited to this. For example, the motor unit 200 may have 2 rotors, and for example, the 2 rotors may be attached to the shaft 41 at predetermined intervals in the axial direction, and the stator 501 may be disposed between the 2 rotors. The present invention can be applied to the configuration having 2 rotors as described above.
Embodiment 3
Next, a pump device according to embodiment 3 of the present invention will be described. In embodiment 1 and embodiment 2, the oil supplied to the pump chamber is discharged from the discharge port by the pump rotor, and circulates in the motor section through the external device and the suction port of the motor section. The oil circulating in the motor unit is returned to the pump chamber, and the pump rotor conveys the oil returned from the motor unit to the discharge port and discharges the oil from the discharge port. That is, the circulation of oil from the pump section to the motor section is a series of flow paths.
In contrast, in the pump device 1000 of the present embodiment, the oil sucked into the pump chamber 331 from the suction port 32c of the pump section 300 is transported to the discharge port 32d by the pump rotor 351 and discharged from the discharge port 32 d. In the pump device 1000 of the present embodiment, the oil sucked into the pump chamber 331 is sent by the pump rotor 351 and flows into the motor section 2000 through the shaft 41. More specifically, most of the oil is discharged from the pressurized region to the discharge port 32d, but a part of the oil flows into the vicinity of the shaft 41 through the axial gap between the inner rotor 371 and the pump body 311. Then, the oil passes between the shaft 41 and the pump body 311, and flows into the motor 2000. This enables cooling of the motor section 2000. The air is sucked into the motor part 2000 and circulated in the motor part 2000, thereby cooling the stator 5000 and the rotor 4000. Hereinafter, the differences from embodiment 1 and embodiment 2 will be mainly described. In the pump device 1000 according to the present embodiment, the same components as those of the pump device according to embodiment 1 or embodiment 2 are denoted by the same reference numerals, and description thereof is omitted.
Fig. 6 is a sectional view showing the pump device 1000 of the present embodiment.
The pump device 1000 of the present embodiment includes a shaft 41, a motor section 2000, and a pump section 300. The shaft 41 rotates about a central axis J extending in the axial direction. The motor section 2000 and the pump section 300 are arranged side by side in the axial direction.
As shown in fig. 6, the motor part 2000 includes a housing 1401, a rotor 4000, a stator 5000, a bearing housing 6501, an upper bearing member 421, a lower bearing member 422, a control device (not shown), and a bus bar assembly (not shown). The control device and the bus bar assembly may be attached to, for example, one end of the rear side of the casing 1401 in the axial direction, or may be attached to the side surface 1401a of the casing 1401, instead of being incorporated in the motor part 2000.
The rotor 4000 includes a rotor magnet 4401 and a rotor yoke 4301. The rotor yoke 4301 has a cup shape (front side opening) and includes: a disc-shaped top plate 4301b having a shaft 41 connected to the center thereof; and a cylindrical portion 4301a provided so that the outer periphery of the top plate portion 4301b extends toward the front side. The rotor magnet 4401 is disposed on the inner circumferential surface of the cylindrical portion 4301a of the rotor yoke 4301, and the inner circumferential surface of the rotor magnet 4401 faces the stator 5000 in the radial direction. The rotor 4000 is fixed to the shaft 41.
An upper bearing member 421 is provided on the front side of the inner peripheral surface of the bearing housing 6501. A lower bearing member 422 is provided on the rear side in the inner peripheral surface of the bearing housing 6501. The upper bearing member 421 and the lower bearing member 422 are fitted to the shaft 41. The upper bearing member 421 and the lower bearing member 422 rotatably support the shaft 41 with respect to the bearing housing 6501.
The stator 5000 is fixed to the outer circumference of the bearing housing 6501. Specifically, the bearing housing 6501 is fitted to the inner circumferential surface of the annular core back of the stator 5000. Top wall 1401 c of casing 1401 connected to the rear-side opening of pump unit 300 is disposed on the front side of stator 5000, and supports bearing housing 6501. A control device (not shown) is disposed between the bottom wall 1401b of the casing 1401 and the stator 5000. The configuration of the pump unit 300 is the same as that of embodiment 1 and embodiment 2, and therefore, the description thereof is omitted.
Next, a cooling structure provided in the pump device 1000 according to the present embodiment will be described. In the present embodiment, oil supplied from an external device flows from the suction port 32c to the discharge port 32d via the pump rotor 351, is sucked into the motor part 2000, and circulates in the motor part 2000. This circulation realizes cooling of the stator 5000 and the rotor 4000. Hereinafter, the flow path of oil in the pump device 1000 will be described mainly focusing on differences from the embodiments 1 and 2.
As shown in fig. 6, the pump apparatus 1000 includes: 1 st channels 1a to 1d connecting the inside of pump section 300 and casing 1401; 2 nd flow paths 2a to 2d provided radially inward of the outer peripheral surface of the stator 5000; a 3 rd flow path 3 provided between the stator 5000 and the rotor 4000; and a 4 th channel connected from the 3 rd channel 3 to the negative pressure region in the pump section 300.
The 1 st channel 1 of the present embodiment passes through at least any one of the following 1 st channel 1a to 1 st channel 1 d. The 1 st flow path 1a is located between the bearing housing 6501 and the upper bearing member 421. The 1 st flow path 1b is a flow path passing through the inside of the upper bearing member 421. The 1 st flow path 1c is located between the shaft 41 and the upper bearing member 421. The 1 st flow path 1d is located between the shaft 41 and the pump body 311.
The position of the upper bearing member 421 is not limited to the position shown in fig. 6, and the pump body 311 may have the upper bearing member 421. In this case, the 1 st flow path 1a is provided between the pump body 311 and the upper bearing member 421. Further, the pump body 311 may have a sliding bearing structure without providing the upper bearing member 421. In this case, the 1 st flow path passes through the 1 st flow path 1d, and the 1 st flow path 1d passes between the shaft 41 and the pump body (bearing member).
The upper bearing member 421 may be a ball bearing. In this case, the 1 st flow path is the 1 st flow path 1b passing through between adjacent balls of the ball bearing (bearing member), that is, inside the bearing member. Further, a notch or a through hole may be provided in at least one of the upper bearing member 421 provided with the 1 st to 1 st flow paths 1a to 1d, the pump body 311, and the shaft 41. By providing the notch portion or the through hole, the channel resistance of the 1 st channel 1 is reduced, and the oil can be sucked from the pump unit 300 to the motor unit 2000 more efficiently.
In the present embodiment, the 2 nd flow path is provided at a position radially inward of the outer peripheral surface of the stator 5000. Specifically, as shown in FIG. 6, the 2 nd channel passes through at least any one of the following 2 nd channel 2a to 2 nd channel 2 e. The 2 nd flow path 2a is located between the bearing housing 6501 and the lower bearing member (1 st bearing member) 422. The 2 nd flow path 2b is a flow path passing through the inside of the lower bearing member (1 st bearing member) 422. The 2 nd flow path 2c is located between the lower bearing member (1 st bearing member) 422 and the shaft 41. The 2 nd flow path 2d is located between the shaft 41 and the bearing housing 6501. The 2 nd flow path 2e is located between the stator 5000 and the bearing housing 6501.
As in embodiment 1 (fig. 3), the 2 nd flow path may be provided between a through hole 52b provided in the core back 51 of the stator 5000 or a cutout 51a provided in the inner circumferential surface of the core back 51 and the bearing housing 6501. In fig. 3, although the bearing housing 6502 is shown, the bearing housing 6501 may be used instead. Instead of the cutout 51a, a cutout may be provided in the outer peripheral surface of the bearing housing 6501, or both of them may be provided. The oil that has flowed into the 2 nd to 2 nd passages 2a to 2e flows from the front side to the rear side and is connected to the 3 rd passage 3. The 4 th channel 4 is the same as that of embodiment 1, and therefore, the description thereof is omitted.
Further, the oil may flow from the 3 rd flow path 3 to the outer circumferential surface of the rotor yoke 4301 and the inner circumferential surface of the housing 1401. In this case, oil is accumulated in the bottom wall 1401b of the casing 1401, and the oil finally flows in the direction of the pump section 300 between the outer peripheral surface of the rotor yoke 4301 and the inner peripheral surface of the casing 1401. The arrows shown in fig. 6 and indicating the flow path between the rotor yoke 4301 and the casing 1401 indicate the flow path described above.
As in embodiment 1 and embodiment 2, the stator 5000 and the rotor 4000 may be integrally molded of resin. In the case where the stator 5000 or the rotor 4000 is an integrally molded product made of resin, the surface area of the stator 5000 or the rotor 4000 in contact with oil is increased. Therefore, the interior of the motor section 2000 can be cooled more efficiently.
According to the present embodiment, the pump device 1000 includes a shaft 41 rotating about a central axis extending in an axial direction, a motor section 2000 rotating the shaft 41, and a pump section 300 located on one side of the motor section 2000 in the axial direction, driven by the shaft 41 through the motor section 2000, and discharging oil, the motor section 2000 includes a rotor 4000 rotating around the shaft 41, a stator 5000 disposed to face the rotor 4000, and a casing 1401 housing the rotor 4000 and the stator 5000, the pump section 300 includes a pump rotor 351 attached to the shaft 41, and pump housings (311 and 321) provided with a suction port 32c sucking oil and a discharge port 32d discharging oil and housing the pump rotor 351, the pump device 1000 includes a 1 st channel connecting the inside of the pump unit 300 and the inside of the housing 141, a 2 nd channel provided at a position radially inward of the outer peripheral surface of the stator 5000, a 3 rd channel provided between the stator 5000 and the rotor 4000, and a 4 th channel connected from the 3 rd channel to a negative pressure region in the pump unit 300.
The pump apparatus 1000 uses the pressurization of the pump rotor 351 to cause oil to flow in the motor section 2000. Here, by providing the 2 nd to 2 nd flow paths 2a to 2e, oil can be efficiently circulated in the motor section 2000. In this way, the oil efficiently circulates in the motor part 2000, and a structure for cooling the rotor 4000 and the stator 5000 at the same time can be provided. That is, a structure having a high cooling effect for suppressing a temperature increase of the motor can be provided.
Embodiment 4
Next, a pump device according to embodiment 4 of the present invention will be described. In embodiment 4, as in embodiment 3, oil supplied from an external device flows from the suction port 32c to the discharge port 32d via the pump rotor, is sucked into the motor unit 201, and circulates in the motor unit 201, thereby cooling the stator 501 and the rotor 402. In embodiment 3, the motor part 2000 has a structure of an outer rotor type motor in which a stator 5000 is positioned at a radially inner side of a rotor 4000. In contrast, the motor unit 201 in the present embodiment has a structure of an axial gap motor in which the stator 501 is disposed to face the rotor 402 in the axial direction. Hereinafter, differences from embodiments 1 to 3 will be mainly described. In the pump device 101 according to the present embodiment, the same components as those of the pump devices according to embodiments 1 to 3 are denoted by the same reference numerals, and description thereof is omitted.
Fig. 7 is a sectional view showing the pump device 101 of the present embodiment.
As shown in fig. 7, pump device 101 includes shaft 41, motor 201, casing 141, and pump 300. The shaft 41 rotates about a central axis J extending in the axial direction. The motor section 201 and the pump section 300 are arranged side by side in the axial direction.
The motor unit 201 includes a rotor 402, a stator 501, an upper bearing member (2 nd bearing member) 421, a lower bearing member (1 st bearing member) 422, a control device (not shown), a bus bar assembly (not shown), and a connector (not shown). The rotor 402 has a disk shape extending in the radial direction. The rotor 402 includes a plurality of magnets 442 arranged in the circumferential direction on a surface (+ Z-side surface) facing the stator 501, and a rotor yoke 432 that holds the magnets 442. That is, the magnet 442 is disposed to face the rear end portion of the stator 501 in the axial direction. The rotor yoke 432 is fixed to the outer peripheral surface of the shaft 41.
The upper bearing member 421 and the lower bearing member 422 rotatably support the shaft 41. The upper bearing member (2 nd bearing member) 421 and the lower bearing member (1 st bearing member) 422 are fixed to the bearing housing 630. The stator 501 includes a plurality of cores arranged in a circumferential direction and having a fan shape in a plan view, coils provided in the respective cores, coil lead wires drawn from the coils of the respective cores, a mold resin integrally fixed to the plurality of cores, and a plurality of lead wire support portions provided at an outer peripheral end of the stator 501.
The housing 141 constitutes a casing of the motor part 201. Further, a control device (not shown) and a bus bar assembly (not shown) may be housed on the rear side (Z side) of the stator 501. The rotor 402 is accommodated at the rear side (-Z side) of the stator 501. The housing 141 has a 1 st housing 121 having a cylindrical shape with a lid opened on the rear side and a 2 nd housing (cover) 131 having a cylindrical shape with a bottom connected to the rear side (-Z side) of the 1 st housing 121. The material of the housing 141 is, for example, metal or resin.
The 1 st housing 121 has a disk-shaped top wall 121a, and the shaft 41 passes through a central portion of the top wall 121 a. Bearing housing 630 fits into the rear opening of pump unit 300. The bearing housing 630 holds the upper bearing member 421 and the lower bearing member 422.
The 2 nd housing 131 has a disk-shaped bottom wall 131a and a cover cylindrical portion 131b extending from the peripheral edge of the bottom wall 131a toward the front side (+ Z side). The positions of the upper bearing member 421 and the lower bearing member 422 are not limited to the positions shown in fig. 7, and may be changed. For example, the pump section 300 may have the upper bearing member 421 instead of the motor section 201. The cover cylindrical portion 131b is fixed to the rear (-Z side) opening of the 1 st housing 121. More specifically, the 1 st chassis 121 and the 2 nd chassis 131 are fixed by fastening with bolts or the like using the flange portions 111 and 112 of the 2 nd chassis 131 and the flange portions 113 and 114 of the 1 st chassis 121.
When the control device (not shown) and the bus bar assembly (not shown) are housed in the 2 nd housing 131, a through hole (not shown) that penetrates in the axial direction is provided in the bottom wall 131a of the 2 nd housing 131, and a connector (not shown) is attached to the through hole. An external connection terminal (not shown) extending from the bus bar block through the bottom wall 131a toward the rear side (the (-Z side) is disposed in the connector.
The pump section 300 is located on one axial side, specifically, the front side (+ Z axis side) of the motor section 201. The pump section 300 is driven by the motor section 201 via the shaft 41. Pump section 300 includes pump body 311, pump rotor 351, and pump cover 321. The pump rotor 351 has an inner rotor 371 and an outer rotor 381.
The pump cover 321 has a discharge port 32 d. As in embodiment 1, the pump section 300 is a positive displacement pump, and in this embodiment, is a trochoid pump. The pump unit 300 is not limited to the trochoid pump, and may be a pump of another type as long as it is a displacement type pump. The description of the components of pump unit 300 is the same as that of embodiment 1, and therefore is omitted. The configuration of the pump section 300 is the same as that of embodiments 1 to 3, and therefore is omitted.
Next, a cooling structure provided in the pump device 101 according to the present embodiment will be described. In the present embodiment, oil supplied from an external device flows from the suction port 32c to the discharge port 32d through the pump rotor 351, is sucked into the motor portion 201, and circulates in the motor portion 201. This circulation realizes cooling of the stator 501 and the rotor 402. Hereinafter, the flow path of oil in the pump device 101 will be described mainly focusing on the differences from embodiment 3.
As shown in fig. 7, the pump device 101 includes 1 st flow path 1a to 1d connecting the inside of the pump unit 300 and the inside of the casing 141, 2 nd flow paths 2a to 2e provided at positions radially inward of the outer peripheral surface of the stator 501, a 3 rd flow path 3 provided between the stator 501 and the rotor 402, and a 4 th flow path 4 connected from the 3 rd flow path 3 to a negative pressure region in the pump unit.
The 1 st flow paths 1a to 1d, the 2 nd flow paths 2a to 2e, and the 4 th flow path 4 of the present embodiment are the same as those of the 3 rd embodiment, and therefore, the description thereof is omitted. The 3 rd flow channel 3 is located between the axial rear end surface of the stator 501 and the axial front end surface of the rotor 402. The oil flowing from the 2 nd passages 2a to 2e passes through the 3 rd passage 3 and flows between the stator 501 and the side surface of the casing 141 (the 5 th passage 5) to the 4 th passage 4.
According to the present embodiment, the pump device 101 includes a shaft 41 rotating about a central axis extending in an axial direction, a motor portion 201 rotating the shaft 41, and a pump portion 300 located on one side in the axial direction of the motor portion 201, driven by the motor portion 201 via the shaft 41, and discharging oil, the motor portion 201 includes a rotor 402 rotating around the shaft 41, a stator 501 disposed opposite to the rotor 402, and a casing 141 housing the rotor 402 and the stator 501, the pump portion 300 includes a pump rotor 351 attached to the shaft 41, and pump housings (311 and 321) provided with a suction port 32c sucking oil and a discharge port 32d discharging oil and housing the pump rotor 351, the pump device 101 includes a 1 st channel 1 connecting the inside of the pump unit 300 and the inside of the housing 141, 2 nd channels 2a to 2e provided at positions radially inward of the outer peripheral surface of the stator 501, a 3 rd channel 3 provided between the stator 501 and the rotor 402, and a 4 th channel 4 connected from the 3 rd channel 3 to a negative pressure region in the pump unit 300.
The pump device 101 causes oil to flow in the motor portion 201 by pressurization of the pump rotor 351. Here, the 2 nd flow channels 2a to 2e are provided, whereby the oil can be efficiently circulated in the motor section 201. In this way, the oil efficiently circulates in the motor unit 201, and a structure for cooling the rotor 402 and the stator 501 at the same time can be provided. That is, a structure having a high cooling effect for suppressing a temperature increase of the motor can be provided.
As in embodiments 1 to 3, the stator 501 and the rotor 402 may be integrally molded from resin. When the stator 501 or the rotor 402 is an integrally molded product made of resin, the surface area of the stator or the rotor in contact with oil is increased. Therefore, the interior of the motor section 201 can be cooled more efficiently.
While the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the present invention.
The present application claims priority based on Japanese application No. 2016-.
Description of the symbols
1001 pump device
1402 casing
2001 motor unit
300 pump part
311 Pump body
321 pump cover
331 pump chamber
41 axle

Claims (27)

1. A pump device, comprising:
a shaft that rotates centering on a central axis extending in an axial direction;
a motor section that rotates the shaft; and
a pump section that is located on one side in an axial direction of the motor section and discharges oil by driving the pump section via the shaft by the motor section,
the motor unit includes:
a rotor that rotates around the shaft;
a stator disposed opposite to the rotor;
a housing accommodating the rotor and the stator; and
a suction port provided in the casing, the suction port sucking the oil,
the pump section includes:
a pump rotor mounted to the shaft;
a pump housing that houses the pump rotor; and
a discharge port provided in the pump housing, the discharge port discharging the oil,
the pump device has:
a 1 st flow path that sucks in the oil from a suction port of the motor unit;
a 2 nd flow path provided at a position radially inward of an outer peripheral surface of the stator;
a 3 rd flow path provided between the stator and the rotor; and
a 4 th channel connected from the 3 rd channel to a negative pressure region in the pump section,
the pump section discharges the oil flowing from the 4 th channel to the pump section from the discharge port.
2. Pump apparatus according to claim 1,
the suction inlet is arranged at the bottom of the shell.
3. Pump apparatus according to claim 1,
the suction inlet is arranged on the side surface of the shell,
the suction port is located between one end of the stator on the side opposite to the pump portion in the axial direction and the bottom of the casing.
4. Pump apparatus according to claim 3,
the pump device includes a cover member that covers a gap between one end of the stator on the side opposite to the pump section in the axial direction and a side surface of the casing.
5. Pump apparatus according to claim 1,
the housing is provided with a plurality of suction ports.
6. Pump apparatus according to claim 1,
when the pump device is disposed so as to be horizontal in the axial direction, the suction port is located below or above the shaft.
7. Pump apparatus according to claim 1,
the 2 nd flow path is provided between an inner peripheral surface of the stator and an outer peripheral surface of the shaft.
8. Pump apparatus according to claim 1,
the 2 nd flow path is provided between a through hole or a cutout portion provided in a stator core included in the stator and an outer peripheral surface of the shaft.
9. Pump apparatus according to claim 1,
the motor unit includes:
a 1 st bearing member that rotatably supports the shaft; and
a cylindrical bearing housing that supports the 1 st bearing member,
the stator is fixed to the bearing housing,
the 2 nd flow path is provided between an inner peripheral surface of a stator core included in the stator and the bearing housing.
10. The pump arrangement according to claim 9,
the 2 nd flow path is provided between the conduction portions each having a notch portion provided on at least one of the inner peripheral surface of the stator and the outer peripheral surface of the bearing housing.
11. The pump arrangement according to claim 9,
the 2 nd flow path passes between the shaft and the bearing housing.
12. The pump arrangement according to claim 9,
the 2 nd flow path is provided between the 1 st bearing member and the bearing housing.
13. The pump arrangement according to claim 9,
the 2 nd flow path passes through the inside of the 1 st bearing member.
14. Pump apparatus according to claim 1,
the pump housing has a pump cover and a pump body,
the pump body is provided with openings at two ends in the axial direction, the shaft penetrates through the pump body,
the pump rotor is rotated by rotation of the shaft.
15. A pump device, comprising:
a shaft that rotates centering on a central axis extending in an axial direction;
a motor section that rotates the shaft; and
a pump section that is located on one side in an axial direction of the motor section and discharges oil by driving the pump section via the shaft by the motor section,
the motor unit includes:
a rotor that rotates around the shaft;
a stator disposed opposite to the rotor; and
a housing accommodating the rotor and the stator,
the pump section includes:
a pump rotor mounted to the shaft; and
a pump housing provided with a suction port that sucks in the oil and a discharge port that discharges the oil, the pump housing accommodating the pump rotor,
the pump device has:
a 1 st channel connecting the inside of the pump section and the inside of the casing;
a 2 nd flow path provided at a position radially inward of an outer peripheral surface of the stator;
a 3 rd flow path provided between the stator and the rotor; and
and a 4 th channel connected from the 3 rd channel to a negative pressure region in the pump section.
16. The pump apparatus of claim 15,
the pump housing has a pump cover and a pump body,
the pump body has a 2 nd bearing member rotatably supporting the shaft,
in the 1 st flow path, the oil passes through at least any one of a portion between the shaft and the 2 nd bearing member, a portion between the 2 nd bearing member and the pump body, and an inside of the 2 nd bearing member.
17. The pump apparatus of claim 16,
the pump body is provided with a sliding bearing structure,
in the 1 st flow path, the oil passes between the shaft and the pump body.
18. The pump apparatus of claim 16,
in the 1 st flow path, the oil passes between the 2 nd bearing member and the pump body.
19. The pump apparatus of claim 16,
the 2 nd bearing part is a ball bearing having a plurality of balls,
in the 1 st flow path, the oil passes between the adjacent balls.
20. The pump apparatus of claim 15,
the 2 nd flow path is provided between an inner peripheral surface of the stator and an outer peripheral surface of the shaft.
21. The pump apparatus of claim 15,
the 2 nd flow path is provided between a through hole or a cutout portion provided in a stator core included in the stator and an outer peripheral surface of the shaft.
22. The pump apparatus of claim 15,
the motor unit includes:
a 1 st bearing member that rotatably supports the shaft; and
a cylindrical bearing housing that supports the 1 st bearing member,
the stator is fixed to the bearing housing,
the 2 nd flow path is provided between an inner peripheral surface of a stator core included in the stator and the bearing housing.
23. The pump apparatus of claim 22,
the 2 nd flow path is provided between the conduction portions each having a notch portion provided on at least one of the inner peripheral surface of the stator and the outer peripheral surface of the bearing housing.
24. The pump apparatus of claim 22,
the 2 nd flow path passes between the shaft and the bearing housing.
25. The pump apparatus of claim 22,
the 2 nd flow path is provided between the 1 st bearing member and the bearing housing.
26. The pump apparatus of claim 22,
the 2 nd flow path passes through the inside of the 1 st bearing member.
27. The pump apparatus of claim 15,
the pump housing has a pump cover and a pump body,
the pump body is provided with openings at two ends in the axial direction, the shaft penetrates through the pump body,
the pump rotor is rotated by rotation of the shaft.
CN201790001291.3U 2016-09-30 2017-09-25 Pump device Active CN210461053U (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2016-195282 2016-09-30
JP2016195282 2016-09-30
PCT/JP2017/034516 WO2018062094A1 (en) 2016-09-30 2017-09-25 Pump device

Publications (1)

Publication Number Publication Date
CN210461053U true CN210461053U (en) 2020-05-05

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ID=61760736

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201790001291.3U Active CN210461053U (en) 2016-09-30 2017-09-25 Pump device

Country Status (3)

Country Link
JP (1) JPWO2018062094A1 (en)
CN (1) CN210461053U (en)
WO (1) WO2018062094A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5643262U (en) * 1979-09-08 1981-04-20
JPS6350192U (en) * 1986-09-19 1988-04-05
US5181837A (en) * 1991-04-18 1993-01-26 Vickers, Incorporated Electric motor driven inline hydraulic apparatus
JP2009019522A (en) * 2007-07-10 2009-01-29 Jtekt Corp Electric pump
JP5880842B2 (en) * 2012-03-05 2016-03-09 株式会社ジェイテクト Electric oil pump device

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WO2018062094A1 (en) 2018-04-05

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