WO2018062094A1 - Pump device - Google Patents

Abstract

This pump device 1001 is provided with a shaft 41, a motor unit 2001 which rotates the shaft 41, and a pump unit 300 which is driven by the motor unit 2001 via the shaft 41 and which discharges oil. The pump device 1001 comprises a first flow path which takes in oil from an inlet 1402c of the motor unit 2001, a second flow path which is disposed radially inside of the outer peripheral surface of a stator 5000, a third flow path which is disposed between the stator 5000 and the rotor 4001, and a fourth flow path which connects from the third flow path to a negative pressure region inside of the pump unit 300, wherein the pump unit 300 discharges, from a discharge port 32d, oil flowing from the fourth flow path to the pump unit 300.

Description

Pump device

The present invention relates to a pump device.

In recent years, electric oil pumps used for transmissions and the like are required to be responsive. In order to realize the responsiveness of the electric oil pump, the motor for the electric oil pump needs to have a high output.
When the motor for the electric oil pump is set to high output, a large current flows through the coil of the motor, the motor becomes high temperature, for example, the permanent magnet of the motor is demagnetized. Therefore, it is necessary to provide a cooling structure for the motor in order to suppress the temperature rise of the motor.
Patent Document 1 discloses an electric motor including an oil supply mechanism that displaces the relative positional relationship between the stator and the rotor in the axial direction by oil pressure of oil corresponding to the rotational speed of the rotor and cools the rotor with oil. ing.

JP 2008-125235 A

However, the electric motor disclosed in Patent Document 1 cannot simultaneously cool the stator and the rotor with oil.

An object of the present invention is to provide a pump device having a structure having a high cooling effect by simultaneously cooling the stator and the rotor.

An exemplary first invention of the present application is a shaft that rotates about a central axis extending in an axial direction, a motor unit that rotates the shaft, and an axial direction one side of the motor unit. A pump unit that is driven through a shaft and discharges oil, and the motor unit rotates around the shaft, a stator that is disposed to face the rotor, the rotor, and the rotor. A housing that houses the stator; and a suction port that is provided in the housing and sucks the oil; and the pump unit is attached to the shaft, and a pump case that houses the pump rotor; A discharge port that is provided in the pump case and discharges the oil, and sucks the oil from a suction port of the motor unit. One flow path, a second flow path provided radially inward from the outer peripheral surface of the stator, a third flow path provided between the stator and the rotor, and the pump from the third flow path A fourth flow path connected to the negative pressure region in the section, and the pump section discharges the oil flowing from the fourth flow path to the pump section from the discharge port.

According to the first exemplary invention of the present application, it is possible to provide a pump device having a structure with a high cooling effect by simultaneously cooling the stator and the rotor.

It is sectional drawing which shows the pump apparatus which concerns on 1st Embodiment. It is the figure which looked at the pump body from the axial direction front side. It is a top view of the stator in 1st Embodiment. It is a figure which shows the modification of the flow path in 1st Embodiment. It is sectional drawing which shows the pump apparatus which concerns on 2nd Embodiment. It is sectional drawing which shows the pump apparatus which concerns on 3rd Embodiment. It is sectional drawing which shows the pump apparatus which concerns on 4th Embodiment.

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. Moreover, in the following drawings, in order to make each structure easy to understand, the actual structure may be different from the scale, number, or the like in each structure.

In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is a direction parallel to one axial direction of the central axis J shown in FIG. The X-axis direction is the left-right direction in FIG. The Y-axis direction is a direction orthogonal 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 simply names used for explanation, and do not limit the actual positional relationship and direction. Unless otherwise specified, a direction parallel to the central axis J (Z-axis direction) is simply referred to as an “axial direction”, and a radial direction around the central axis J is simply referred to as a “radial direction”. The circumferential direction centered at, that is, around the central axis J (θ direction) is simply referred to as “circumferential direction”.

In this specification, “extending in the axial direction” means not only extending in the axial direction (Z-axis direction) but also extending in a direction inclined by less than 45 ° with respect to the axial direction. Including. Further, in this specification, the term “extend in the radial direction” means 45 ° with respect to the radial direction in addition to the case where it extends strictly in the radial direction, that is, the direction perpendicular to the axial direction (Z-axis direction) Including the case of extending in a tilted direction within a range of less than.

First embodiment

FIG. 1 is a cross-sectional view of a pump device 1001 according to this embodiment.
The pump device 1001 includes a shaft 41, a motor unit 2001, and a pump unit 300. The shaft 41 rotates around a central axis J that extends in the axial direction. The motor unit 2001 and the pump unit 300 are provided side by side along the axial direction.

<Motor part>
As shown in FIG. 1, the motor unit 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), A bus bar assembly (not shown). Note that the control device and the bus bar assembly may not be built in the motor unit 2001, and may be attached to one end on the rear side in the axial direction of the housing 1402 or may be attached to the side surface of the housing 1402, for example.

The rotor 4001 has a rotor magnet 4402 and a rotor yoke 4302. The rotor yoke 4302 has a cup shape with a rear side opening. It has a disc-shaped top plate portion 4302b with a shaft 41 connected at the center, and a cylindrical portion 4302a provided so as to extend the outer periphery of the top plate portion 4302b to the rear side. The rotor magnet 4402 is disposed on the inner peripheral surface of the cylindrical portion 4302a of the rotor yoke 4302, and the inner peripheral surface faces the stator 5000 in the radial direction. The rotor 4001 is fixed to the shaft 41.

The bearing housing 6502 includes a cylindrical bearing housing cylindrical portion 6502b, an annular projecting portion 6502a provided on the inner peripheral surface of the bearing housing cylindrical portion 6502b, and a flange portion 6502c provided on the outer peripheral surface of the bearing housing cylindrical portion 6502b. And having. The annular projecting portion 6502a projects inward so as to reduce the inner diameter of the bearing housing cylindrical portion 6502b.

A lower bearing member 422 is provided on the rear side of the inner peripheral surface of the bearing housing cylindrical portion 6502b. An upper bearing member 421 is provided on the front side of the bearing housing cylindrical portion 6502b. The upper bearing member 421 and the lower bearing member 422 are each fitted to the shaft 41. The upper bearing member 421 and the lower bearing member 422 support the shaft 41 with respect to the bearing housing 6502 so as to be rotatable.

The lower bearing member 422 may not be provided, and the housing 1402 may have a sliding bearing structure (bearing member). When the suction port 1402c is located at the bottom (1402b) of the housing 1402 and between the bearing member (slide bearing structure) and the shaft 41, that is, the oil sucked from the suction port 1402c in the first flow path 1 is supplied. It can be used as a lubricating oil, and the oil can be efficiently sucked into the motor unit 2001.

The stator 5000 is fixed to the outer periphery of the bearing housing 6502. Specifically, the bearing housing 6502 is fitted on the inner peripheral surface of an annular core back portion (not shown) of the stator 5000. A bottom wall 1402 b of the housing 1402 is disposed on the rear side of the stator 5000 and supports the bearing housing 6502. A control device (not shown) is disposed between the bottom wall 1402 b of the housing 1402 and the stator 5000.

The housing 1402 has a suction port 1402c. The suction port 1402c sucks oil discharged from the discharge port 32d by the pump unit 300. In the example shown in FIG. 1, the suction port 1402c is provided in the cylindrical portion 1402a (side surface of the housing). Specifically, the suction port 1402 c is a cylindrical portion 1402 a (side surface of the housing) of the housing 1402, one end of the stator (the rear side end portion of the stator 5000) opposite to the pump portion in the axial direction, and the housing 1402. It is located between the rear side end (bottom).

By providing the suction port 1402c at the position described above, oil can smoothly flow to a second flow path in the motor unit 2001, which will be described later. That is, it is possible to provide an optimum flow path, and it is possible to efficiently distribute the oil throughout the stator 5000. For this reason, the stator 5000 can be efficiently cooled.

Note that the position of the inlet 1402c is not limited to this. The suction port 1402c may be provided at an arbitrary position of the housing 1402. For example, the suction port 1402c may be provided in the bottom wall (bottom portion) 1402b (the bottom portion of the housing 1402) 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, the second flow path described later is between the lower bearing member 422 and the bearing housing 6502, It can pass either between the side bearing member 422 and the shaft 41 or inside the lower bearing member 422. The outer peripheral surface of the shaft 41 may have a notch, and when the fourth flow path passes through a part between the lower bearing member 422 and the shaft 41, the fourth flow path is formed by the notch. The flow rate of the oil flowing into the can be increased. The position of the suction port 1402c may be determined according to the position of the external device to which the pump device 1001 is attached.

For example, consider a case where the pump device 1001 is attached to a transmission, for example, a CVT (Continuously Variable Transmission, continuously variable transmission) with the following arrangement. The axial direction of the pump device 1001 is horizontally arranged so that the positive side (+ X side) in the X-axis direction is the upper side and the negative side (−X side) in the X-axis direction is the lower side with respect to the shaft 41 A pump device 1001 is disposed.

The oil discharged from the discharge port 32d of the pump unit 300 flows into the motor unit 2001 via the suction port 1402c of the motor unit 2001 via the CVT and returns to the pump unit 300. In this oil circulation, when the oil flow path from the CVT to the motor unit 2001 is on the upper side (+ Z) in the arrangement of the pump device 1001 described above, the suction port 1402c is similarly provided on the upper side. Since the oil sucked from the suction port 1402c flows in the direction of gravity and can circulate in the entire motor unit 2001, the oil can be circulated more efficiently. Depending on the arrangement of the pump device 1001, the position of the suction port 1402c may be lower than the shaft 41 (−X side).

The number of the inlets 1402c provided is not limited to one and may be plural. By providing a plurality of suction ports 1402c, it becomes possible to allow more oil to flow (suction) into the motor unit 2001. For this reason, even when the amount of oil discharged from the pump is large, it is possible to ensure an optimal intake amount into the motor. By securing the optimal oil intake amount, the stator and the rotor can be optimally cooled in the cooling structure described later.

<Pump part>
The pump unit 300 is located on one side of the motor unit 2001 in the axial direction, specifically on the front side (+ Z axis side). The pump unit 300 is driven through the shaft 41 by the motor unit 2001. The pump unit 300 includes a pump case and a pump rotor 351. The pump case 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 case.

The pump body 311 has a pump chamber 331 that houses a hollow pump rotor 351 from the front side (+ Z side) surface to the rear side (−Z side). The shape of the pump chamber 331 viewed in the axial direction is circular. The pump body 311 has through-holes 311 a that are open at both ends in the axial direction, through which the shaft 41 passes, and whose front-side opening opens into the pump chamber 331. The opening on the rear side of the through hole 311a opens on the motor unit 2001 side. The through hole 311a functions as a bearing member that rotatably supports the shaft 41.

The pump unit 300 is a positive displacement pump that pumps oil by expanding and reducing the volume of a sealed space (oil chamber), and is a trochoid pump in this embodiment. FIG. 2 is a view of the pump body 311 as viewed from the front side in the axial direction. The pump rotor 351 is attached 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 surface.

The inner rotor 371 is fixed to the shaft 41. More specifically, the front end of the shaft 41 is press-fitted inside the inner rotor 371. The inner rotor 371 rotates around the axis (θ direction) together with the shaft 41. The outer rotor 381 has an annular shape that surrounds the radially outer side of the inner rotor 371. The outer rotor 381 is a gear having teeth on the radially inner side surface. The outer rotor 381 is rotatably accommodated in the pump chamber 331. The outer rotor 381 is formed with an inner housing chamber 391 for housing the inner rotor 371, and the inner housing chamber 391 is formed in a star shape. The inner rotor 371 is housed rotatably in the inner housing chamber 391.

The number of inner teeth of the outer rotor 381 is set larger than the number of outer teeth of the inner rotor 371. The inner rotor 371 and the outer rotor 381 mesh with each other, and when the inner rotor 371 is rotated by the shaft 41, the outer rotor 381 is rotated 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 unit 2001 and the pump unit 300 have the same rotation axis. Thereby, it can suppress that an electric oil pump enlarges to an axial direction.

As the inner rotor 371 and the outer rotor 381 rotate, the volume of the space formed between the inner rotor 371 and the outer rotor 381 changes according to the rotational position. The pump rotor 351 is configured to suck oil from the suction port 74 by utilizing the volume change and pressurize the sucked oil to be discharged from the discharge port 75. In the present embodiment, a region where the volume is increased (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, but may be another type of pump as long as it is a positive displacement pump that pumps oil by expanding and reducing the volume of a sealed space (oil chamber). There may be. For example, the pump unit 300 may be a vane pump. When the pump unit 300 is a vane pump, the pump chamber 331 houses a cylindrical rotor (not shown) fixed to the shaft 41. The rotor (not shown) has a plurality of slots and vanes slidably mounted in the slots. The outer periphery of the rotor is arranged eccentrically with respect to the inner periphery of the pump chamber 331, so that a crescent-shaped space is generated 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 slots mounted on the rotor. As the rotor rotates and the vanes attached to the slots advance and retract, the volume of each region changes according to the rotational position. Similar to the case of the trochoid pump, oil can be sucked from the suction port (not shown) by utilizing the volume change, and the sucked oil can be pressurized and discharged from the discharge port (not shown). In each region formed between the rotor and the pump chamber 331, a region where 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 includes a pump cover main body 321a and a pump discharge cylindrical portion 321b. The pump cover main body 321a has a disk shape that expands in the radial direction. The pump cover main body 321a closes the opening on the front side of the pump chamber 331. The pump discharge cylindrical portion 321b has a cylindrical shape extending in the axial direction. The pump discharge cylindrical portion 321b opens at both axial ends. The pump discharge cylindrical portion 321b extends from the pump cover main body 321a to the rear side.

The pump unit 300 has a discharge port 32d. The discharge port 32d is provided in the pump cover 321. The discharge port 32d includes the inside of the pump discharge cylindrical portion 321b. 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 oil can be discharged 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 via 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 32d.

Next, the cooling structure of the pump device 1001 according to this embodiment will be described. According to this embodiment, the oil supplied to the pump chamber 331 is discharged from the discharge port 32d by the pump rotor 351, and circulates in the motor unit 2001 via the external device and the suction port 1402c of the motor unit 2001. Then, the stator 5000 and the rotor 4001 are cooled at the same time. The oil circulated through the motor unit 2001 is returned to the pump chamber 331, and the pump rotor 351 discharges the oil returned from the motor unit 2001 from the discharge port 32d.

According to this embodiment, since it is possible to circulate oil from the pump unit to the motor unit as a series of flow paths, it is possible to simultaneously cool the stator and the rotor without reducing pump efficiency.

As shown in FIG. 1, the pump device 1001 includes a first flow path 1 for sucking oil from a suction port 1402 c of the motor unit 2001, and a second flow path 2 provided radially inward from the outer peripheral surface of the stator 5000. The third flow path 3 provided between the stator 5000 and the rotor 4001 and the fourth flow path 4 connected from the third flow path 3 to the negative pressure region in the pump unit 300 are provided. The pump unit 300 discharges oil flowing from the fourth flow path 4 to the pump chamber 331 from the discharge port 32d. Details of each flow path will be described below.

<First channel>
The first flow path 1 in FIG. 1 is connected from the suction port 1402c of the housing 1402 into the motor unit 2001, and is located between the rear end of the stator 5000 and the bottom wall 1402b of the housing 1402. The first flow path 1 differs depending on the position of the suction port 1402c.

The position of the suction port 1402c is not limited to the position shown in FIG. 1, but can be provided at any position on the side surface of the housing 1402 and 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.

<Second channel>
The second flow path 2 in FIG. 1 is a flow path provided radially inward from the outer peripheral surface of the stator 5000. In the example shown in FIG. 1, the second flow path 2 is provided between the inner peripheral surface of the stator 5000 and the shaft 41. Specifically, it is provided between the inner peripheral surface of core back portion 51 (see FIG. 3) of stator 5000 and bearing housing 6502.

FIG. 3 is a view of the stator 5000 and the bearing housing 6502 as viewed from the rear side. As shown in FIG. 3, the second flow path 2 may be provided between the notch portion 51 a provided on the inner peripheral surface of the core back portion 51 and the bearing housing 6502.

In addition, instead of the notch 51a, the notch 6502d may be provided on the outer peripheral surface of the bearing housing 6502, or both the notch 51a and the notch 6502d may be provided. The oil flowing into the second flow path 2 flows from the rear side to the front side and is connected to the third flow path 3.

The second flow path 2 is not limited to be 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 52 b may be provided in the core back portion 51 of the stator 5000, and the through hole 52 b may be used as the second flow path 2. Moreover, you may use between the adjacent teeth parts 52 of the some teeth part 52 which the core back part 51 has mutually spaced apart arrange | positioned as the 2nd flow path 2. FIG. Other examples of the second flow path 2 will be described later with reference to FIG.

In addition, when using between the adjacent teeth parts 52 as the 2nd flow path 2, you may provide a ring member (not shown) between the stator 5000 and the rotor 4001. FIG. By using the ring member, the oil flowing between the teeth 52 that is the second flow path 2 and the oil flowing between the stator 5000 that is the third flow path 3 and the rotor 4001 do not merge. It can be efficiently circulated in the part 2001. By using the through hole 52b, the cutout portion 51a, or the adjacent teeth portion 52 of the core back portion 51 as an oil flow path, the surface area of the stator 50 in contact with the oil can be increased. The coil 5301 can be cooled more efficiently. Generally, in a motor, a coil generates the most heat. The heat generated by the coil is transmitted to the core back part 51 and the tooth part 52. That is, the motor unit 2001 generates a large amount of heat from the stator 5000. Therefore, being able to cool the stator 5000 efficiently means that the motor unit 2001 can be efficiently cooled.

In this embodiment, a ring member 6503 that connects the rear side coil end of the stator 5000 and the side surface of the housing 1402 is provided. As a result, the first flow path 1 and the flow path connecting from the third flow path 3 to the fourth flow path 4 do not match, so the oil flowing into the first flow path 1 smoothly flows into the second flow path 2. It is possible to flow into. That is, the oil that has flowed into the motor unit 2001 from the first channel 1 returns from the fourth channel 4 into the pump unit 300 without passing through a useless circulation path. An optimum flow path can be provided, and oil can be efficiently distributed throughout the stator 5000. For this reason, the inside of the motor part 2001 can be cooled efficiently.

<Third flow path>
The third flow path 3 in FIG. 1 is provided between the stator 5000 and the rotor 4001. In the example shown in FIG. 1, the third flow path 3 is located between the outer peripheral surface of the stator 5000 and the inner peripheral surface of the rotor 4001. The oil that has flowed into the third flow path 3 from the second flow path 2 flows from one end on the front side of the third flow path 3 to one end on the rear side.

Note that the third flow path 3 is not limited 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, the core back portion 51 of the stator 5000 may be provided with a through hole 52b or a notch 51a, and the through hole 52b or the notch 51a may be used as the third flow path. A space between the plurality of tooth portions 52 (between adjacent teeth) that are disposed apart from each other in the core back portion 51 may be used as the third flow path 3. The coil 5301 of the stator 5000 can be cooled more efficiently and the rotor can be cooled by using the through hole 52b of the core back part 51, the notch part 51a, or between adjacent tooth parts 52 as an oil flow path. it can.

Similarly, the rotor yoke 4302 may be provided with a through hole (not shown) or a notch (not shown), and the through hole or the notch may be used as the third flow path. By using the through hole or notch 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 third flow path 3 may be provided at an arbitrary position as long as it is between the stator 5000 and the rotor 4001.

<Fourth channel>
The fourth flow path 4 in FIG. 1 is a flow path provided in the pump body 311 and connected from the third flow path to the negative pressure region in the pump unit 300. Specifically, the fourth flow path 4 has a first opening 311 c at the rear side end of the pump body 311, and a second opening 311 d in the vicinity of the negative pressure region of the pump chamber 331.

By providing the fourth flow path 4, the oil sucked into the motor unit 2001 through the suction port 1402 c can be circulated from the motor unit 2001 into the pump unit 300. Thereby, it is possible to efficiently cool the stator 5000 and the rotor 4001. The position of the first opening 311c is not limited to the position shown in FIG. 1 and may be provided at any position as long as it is a rear side end of the pump body 311.

The cross-sectional area of the first opening 311c that is the rear-side opening of the fourth flow path 4 is smaller than the cross-sectional area of the discharge port 32d of the pump unit 300. Therefore, it is possible to suppress the amount of oil flowing into the pump unit 300 from the motor unit 2001 from being smaller than the discharge amount of the pump and the amount of oil flowing into the negative pressure region from being excessive. Therefore, it is possible to suppress a decrease in pump efficiency caused by 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, in the second flow path 2 and the third flow path 3, the surface area where the stator 5000 comes into contact with oil can be increased. For this reason, the inside of the motor part 2001 can be cooled more efficiently. Similarly to 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 third flow path 3 where the rotor 4001 comes into contact with oil can be increased, so that demagnetization of the rotor magnet 4402 can be suppressed and the motor unit 2001 can be more efficiently performed. Can be cooled.

<Modified example of flow path>
In the example illustrated in FIG. 1, the suction port 1402 c is provided on the side surface of the housing 1402. However, the position of the suction port 1402c is not limited to this. For example, the suction port may be provided in the bottom wall (bottom portion) 1402b of the housing 1402. FIG. 4 is a diagram showing each flow path 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 first flow path 1 is located between the suction port 1402b and the shaft 41 and the bearing housing 6502. The second flow path passes through at least one part of the following second flow path 2a to second flow path 2d. The second flow path 2 a is located between the bearing housing 6502 and the lower bearing member (first bearing member) 422. The second flow path 2 b is a flow path that passes through the inside of the lower bearing member (first bearing member) 422. For example, when the lower bearing member 422 is a ball bearing, the second flow path 2b is located between adjacent balls.

The second flow path 2 c is located between the lower bearing member (first bearing member) 422 and the shaft 41. For example, the pump unit 300 may have a sliding bearing structure instead of the lower bearing member 422. In this case, the second flow path 2 c is located between the bearing member and the shaft 41. The second flow path 2d is located between the shaft 41 and the bearing housing 6502. Similar to the case of the lower bearing member 422, the oil flowing into the second flow path 2d passes through at least one part of the second flow path 2a to the second flow path 2c in the upper bearing member 421 and passes through the third flow path. Flow to Road 3.

According to the present embodiment, the pump device 1001 is located on a shaft 41 that rotates about a central axis that extends in the axial direction, a motor unit 2001 that rotates the shaft 41, and one axial direction of the motor unit 2001. A pump 300 that is driven by a portion 2001 through a shaft 41 and discharges oil. The motor unit 2001 is provided in the rotor 4001 that rotates around the shaft 41, the stator 5000 disposed to face the rotor 4001, the housing 1402 that houses the rotor 4001 and the stator 5000, and the housing 1402, and sucks oil. A suction port 1402c. The pump unit 300 includes a pump rotor 351 attached to the shaft 41, a pump case (311 and 321) that accommodates the pump rotor 351, and a discharge port 32d that is provided in the pump case (311 and 321) and discharges oil. The pump device 1001 includes a first flow path for sucking oil from a suction port 1402c of the motor unit 2001, a second flow path provided radially inward from the outer peripheral surface of the stator 5000, and between the stator 5000 and the rotor 4001. And a fourth flow path that leads from the third flow path to the negative pressure region in the pump unit 300, and the pump unit 300 is an oil that flows from the fourth flow path to the pump unit 300. Is discharged from the discharge port 32d.

According to the present embodiment, 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 the stator 5000 and the rotor 4001 are circulated. Cool at the same time. The oil circulated through the motor unit 2001 is returned to the pump chamber 331, and the pump rotor 351 discharges the oil returned from the motor unit 2001 from the discharge port 32d. Accordingly, since the oil circulation from the pump unit 300 to the motor unit 2001 can be made a series of flow paths, the oil circulates in the motor unit 2001 without reducing the pump efficiency, and the stator 5000 and the rotor 4001. Can be cooled at the same time. Further, by providing the second flow path 2, the surface area where the stator 5000 comes into contact with oil can be increased. Therefore, the stator 5000 can be cooled more efficiently.

Second embodiment

Next, a pump device according to a second embodiment of the present invention will be described. In the first embodiment, the motor unit has a configuration of an outer rotor type motor in which the stator is positioned on the radially inner side of the rotor. On the other hand, the motor unit in the present embodiment has a configuration of an axial gap type motor in which the stator is arranged to face the rotor in the axial direction. Hereinafter, the difference from the first embodiment will be mainly described. In the pump device according to the present embodiment, the same components as those of the pump device according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 5 is a cross-sectional view showing the pump device 100 of the present embodiment.
As shown in FIG. 5, the pump device 100 includes a shaft 41, a motor unit 200, a housing 141, and a pump unit 300. The shaft 41 rotates around a central axis J that extends in the axial direction. The motor unit 200 and the pump unit 300 are provided side by side along the axial direction.

The motor unit 200 includes a rotor 401, a stator 501, an upper bearing member (second bearing member) 421, a lower bearing member (first 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 a circumferential direction on a surface (−Z side surface) facing the stator 50, and a rotor yoke 431 that holds the magnet 441.
That is, the magnet 441 is disposed to face the front side end portion of the stator 501 in the axial direction. The rotor yoke 431 is fixed to the outer peripheral surface of the shaft 41.

The upper bearing member 421 and the lower bearing member 422 support the shaft 41 rotatably. The upper bearing member (second bearing member) 421 and the lower bearing member (first bearing member) 422 are fixed to the bearing housing 630. The stator 501 includes a plurality of planar fan-shaped cores arranged in the circumferential direction, coils provided in the respective cores, coil lead wires drawn from the coils of the respective cores, and the plurality of cores integrally fixed. And a plurality of lead wire support portions provided at the outer peripheral end of the stator 50.

The housing 141 constitutes a housing of the motor unit 200. A control device (not shown) and a bus bar assembly (not shown) may be accommodated on the rear side (−Z side) of the stator. The rotor 401 is accommodated on the front side (+ Z side) of the stator 501. The housing 141 includes a covered cylindrical first housing 121 having an open rear side, and a bottomed cylindrical second housing (cover) 131 connected to the rear side (−Z side) of the first housing 121. The material of the housing 141 is, for example, metal or resin.

The first housing 121 has a disk-shaped top wall 121a, and the shaft 41 is passed through the central portion of the top wall 121a. To do. The upper bearing holding part 651 is fitted into the rear side opening of the pump part 300. The upper bearing holding portion 651 holds the upper bearing member 421.

The second housing 131 includes a disc-shaped bottom wall 131a and a cover cylindrical portion 131b extending from the peripheral edge of the bottom wall 131a to the front side (+ Z side). A bearing housing 630 is connected to the central portion of the bottom wall 131a. An upper bearing member 421 and a lower bearing member 422 are held in the bearing housing 630. The positions of the upper bearing member 421 and the lower bearing member 422 are not limited to the positions shown in FIG.

For example, the upper bearing member 421 may be included in the pump unit 300 instead of the motor unit 200. The cover cylindrical portion 131 b is fixed to the rear side (−Z side) opening of the first housing 121. More specifically, the first housing 121 and the second housing 131 are fixed by a method such as bolt fastening using the flange portions 111 and 112 of the second housing 131 and the flange portions 113 and 114 of the first housing 121. Is done.

When a control device (not shown) and a bus bar assembly (not shown) are accommodated in the second housing 131, the bottom wall 131a of the second housing 131 is provided with a through hole (not shown) penetrating in the axial direction. A connector (not shown) is attached to the through hole. The connector is provided with an external connection terminal (not shown) extending from the bus bar assembly through the bottom wall 131a to the rear side (-Z side).

The housing 141 has a suction port 141a. The suction port 141a sucks oil discharged from the discharge port 32d by the pump unit 300. In the example shown in FIG. 5, the suction port 141a is provided in the cylindrical portion 121b (side surface of the housing). Specifically, the suction port 141a is a cylindrical portion 121b (side surface of the housing) of the first housing 121, and is one end of the stator (the rear side end portion of the stator 501) opposite to the pump portion in the axial direction, and the housing 141 and the rear side end portion (the bottom portion, the bottom wall 131a of the second housing 131).

By providing the suction port 141a at the above-described position, oil can smoothly flow to a second flow path in the motor unit 200 described later. That is, it is possible to provide an optimum flow path, and it is possible to efficiently distribute the oil throughout the stator 501. For this reason, the stator 501 can be efficiently cooled.

Note that the position of the inlet 141a is not limited to this. The suction port 141a may be provided at an arbitrary position of the housing 141. For example, the suction port 141a may be provided in the bottom wall 131a of the second housing 131 (the bottom portion of the housing 141). The flow path when the suction port 141a is provided at the bottom of the housing 141 is the same as that in the first embodiment (FIG. 4). The position of the suction port 141a may be determined according to the position of the external device to which the pump device 100 is attached, as in the first embodiment. The number of the inlets 141a provided is not limited to one and may be plural as in the first embodiment.

The pump unit 300 is located on one side of the motor unit 200 in the axial direction, specifically on the front side (+ Z axis side). The pump unit 300 is driven through the shaft 41 by the motor unit 200. The pump unit 300 includes a pump body 311, a pump rotor 351, and a pump cover 321. The pump rotor 351 includes an inner rotor 371 and an outer rotor 381.

The pump cover 321 has a discharge port 32d. The pump unit 300 is a positive displacement pump as in the first embodiment, and is a trochoid pump in this embodiment. The pump unit 300 is not limited to the trochoid pump, and may be another type of pump as long as it is a positive displacement pump. Since the description about each member which the pump part 300 has is the same as that of 1st Embodiment, it abbreviate | omits.

Next, the cooling structure of the pump device 100 according to this embodiment will be described. According to the present embodiment, as in the first embodiment, 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, and passes through the suction port 141a of the motor unit 200. The stator 501 and the rotor 401 are cooled at the same time. The oil circulated through the motor unit 200 is returned to the pump chamber 331, and the pump rotor 351 discharges the oil returned from the motor unit 200 from the discharge port 32d. According to the present embodiment, since the oil circulation from the pump unit 300 to the motor unit 200 can be made a series of flow paths, the stator 501 and the rotor 401 can be cooled at the same time without reducing the pump efficiency. it can. Hereinafter, the oil flow path in the pump apparatus 100 will be described focusing on differences from the first embodiment.

As shown in FIG. 5, the pump device 100 includes a first flow path 1 for sucking oil from a suction port 141 a of the motor unit 200, and a second flow path 2 provided radially inward from the outer peripheral surface of the stator 501. The third flow path 3 provided between the stator 501 and the rotor 401 and the fourth flow path 4 connected from the third flow path 3 to the negative pressure region in the pump unit 300 are provided. The pump unit 300 discharges oil flowing from the fourth flow path 4 to the pump chamber 331 from the discharge port 32d.

Since the first flow path and the second flow path of this embodiment are the same as those of the first embodiment, description thereof is omitted. In the present embodiment, as shown in FIG. 5, the third flow path 3 is located between the rotor 401 and one axial end of the stator 501 facing the magnet 441 of the rotor 401.

Also in the present embodiment, as in the first embodiment, the stator 501 and the rotor 401 may be integrally molded products made of resin. When the stator 501 or the rotor 401 is an integrally molded product made of resin, the surface area where the stator 501 and the rotor 401 come into contact with oil can be increased. For this reason, the inside of the motor part 200 can be cooled more efficiently. By increasing the surface area where the rotor 401 comes into contact with oil, it is possible to suppress demagnetization of the magnet 441.

According to the present embodiment, the pump device 100 is located on a shaft 41 that rotates about a central axis extending in the axial direction, a motor unit 200 that rotates the shaft 41, and one axial direction side of the motor unit 200. A pump 300 that is driven by a portion 200 via a shaft 41 and discharges oil. The motor unit 200 is provided in the rotor 401 that rotates around the shaft 41, the stator 501 that is disposed to face the rotor 401, the housing 141 that houses the rotor 401 and the stator 501, and the housing 141, and sucks oil. A suction port 141a. The pump unit 300 includes a pump rotor 351 attached to the shaft 41, a pump case (311 and 321) that accommodates the pump rotor 351, and a discharge port 32d that is provided in the pump case (311 and 321) and discharges oil. The pump device 100 includes a first flow path for sucking oil from a suction port 141 a of the motor unit 200, a second flow path provided radially inward from the outer peripheral surface of the stator 501, and between the stator 501 and the rotor 401. And a fourth flow path that leads from the third flow path to the negative pressure region in the pump unit 300, and the pump unit 300 is an oil that flows from the fourth flow path to the pump unit 300. Is discharged from the discharge port 32d.

According to this 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 200 through the suction port 141a of the motor unit 200, and the stator 501 and the rotor 401 are connected. Cool at the same time. The oil circulated through the motor unit 200 is returned to the pump chamber 331, and the pump rotor 351 discharges the oil returned from the motor unit 200 from the discharge port 32d. Therefore, since the oil can be circulated from the pump unit 300 to the motor unit 200 as a series of flow paths, the oil circulates in the motor unit 200 without reducing the pump efficiency, and the stator 501 and the rotor 401 are circulated. Can be cooled at the same time. Further, by providing the second flow path 2, the surface area where the stator 501 comes into contact with oil can be increased. Therefore, the stator 501 can be cooled more efficiently.

Also in the present embodiment, the second flow path 2 is not limited to the second flow path 2 shown in FIG. 5, but may be any flow path provided on the radially inner side from the outer peripheral surface of the stator 501. Good. The second flow path 2 can change according to the positions of the bearing members (421 and 422) and the suction port 141a. For example, when the position of the suction port 141a is located at the bottom of the housing 141 (the bottom wall 131a of the second housing 131) and between the bearing housing 630 and the shaft 41, the first embodiment (FIG. 4) and Similarly, it passes through at least a part of the following flow paths.

That is, between the bearing housing 630 and the lower bearing member (first bearing member) 422, the inside of the lower bearing member (first bearing member) 422, the lower bearing member (first bearing member) 422, It passes through at least a part of any flow path located between the shaft 41 or between the shaft 41 and the bearing housing 630.

Also in the present embodiment, the surface area where the stator 501 comes into contact with the oil can be increased by having the second flow path 2 as in the first embodiment. For this reason, the pump apparatus 100 can cool the motor part 200 more efficiently.

In addition, the pump apparatus 100 may have the 5th flow path 5 as another flow path. The fifth channel 5 is a channel located between the stator 501 and the side surface of the housing 141. Since the contact area between the stator 501 and the oil can be increased by having the fifth flow path, the stator 501 can be cooled more efficiently.

Further, in order to flow the oil in the first flow path 1 to the second flow path 2 without being divided into the fifth flow path 5, a ring member (not shown) is used as in the first embodiment (ring member 6503 in FIG. 1). ) May be used. The ring member connects the rear side end of the stator 501 and the side surface of the housing 141. Since the oil that has flowed into the first flow path 1 flows to the second flow path 2 without being diverted by the ring member, the oil can be efficiently flowed to the second flow path 2. Therefore, the stator 501 and the rotor 401 can be cooled more efficiently at the same time.

In the pump device 100 of the present embodiment, the case where the stator 501 is fixed to the bearing housing 630 has been described. However, the present invention is not limited to this. Even if the stator 501 of the pump device 100 is fixed to the cylindrical portion 121b of the housing 141, the present invention can be applied, and the pump device 100 has a cooling structure with a similar 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. However, the present invention is not limited to this. For example, the motor unit 200 may have two rotors. For example, the two rotors are attached to the shaft 41 at a predetermined interval in the axial direction, and the stator 501 is disposed between the two rotors. May be. The present invention can also be applied to the configuration having the two rotors described above.

Third embodiment

Next, a pump device according to a third embodiment of the present invention will be described. In the first embodiment and the second embodiment, the oil supplied to the pump chamber is discharged from the discharge port by the pump rotor and circulates in the motor unit via the external device and the suction port of the motor unit. Then, the oil circulated through the motor unit is returned to the pump chamber, and the pump rotor sends the oil returned from the motor unit to the discharge port and is discharged from the discharge port. That is, the oil circulation from the pump unit to the motor unit becomes a series of flow paths.

On the other hand, in the pump device 1000 of the present embodiment, oil sucked into the pump chamber 331 from the suction port 32c of the pump unit 300 is sent to the discharge port 32d by the pump rotor 351 and discharged from the discharge port 32d. . Further, in the pump device 1000 of this embodiment, the oil sucked into the pump chamber 331 is sent by the pump rotor 351 and flows into the motor unit 2000 through the shaft 41. Specifically, most of the oil is discharged from the pressurizing region to the discharge port 32 d, but a part passes through the axial gap between the inner rotor 371 and the pump body 311 and flows into the vicinity of the shaft 41. Thereafter, the oil flows between the shaft 41 and the pump body 311 and flows into the motor unit 2000. Thereby, the motor unit 2000 can be cooled. The stator 5000 and the rotor 4000 are cooled by being sucked into the motor unit 2000 and circulating in the motor unit 2000. Hereinafter, the difference from the first embodiment and the second embodiment 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 the first embodiment or the second embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 6 is a cross-sectional view showing the pump device 1000 of the present embodiment.
The pump device 1000 of this embodiment includes a shaft 41, a motor unit 2000, and a pump unit 300. The shaft 41 rotates around a central axis J that extends in the axial direction. The motor unit 2000 and the pump unit 300 are provided side by side along the axial direction.

As shown in FIG. 6, the motor unit 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), A bus bar assembly (not shown). The control device and the bus bar assembly may not be built in the motor unit 2000, and may be attached to one end on the rear side in the axial direction of the housing 1401, or may be attached to the side surface 1401a of the housing 1401, for example.

The rotor 4000 includes a rotor magnet 4401 and a rotor yoke 4301. The rotor yoke 4301 has a cup shape (front side opening), a disk-shaped top plate portion 4301b having a shaft 41 connected to the center, and a cylinder provided so that the outer periphery of the top plate portion 4301b extends to the front side. Part 4301a. The rotor magnet 4401 is disposed on the inner peripheral surface of the cylindrical portion 4301 a of the rotor yoke 4301, and the inner peripheral surface faces the stator 5000 in the radial direction. The rotor 4000 is fixed to the shaft 41.

On the inner peripheral surface of the bearing housing 6501, an upper bearing member 421 is provided on the front side. A lower bearing member 422 is provided on the rear side of the inner peripheral surface of the bearing housing 6501. The upper bearing member 421 and the lower bearing member 422 are each fitted to the shaft 41. The upper bearing member 421 and the lower bearing member 422 support the shaft 41 so as to be rotatable with respect to the bearing housing 6501.

The stator 5000 is fixed to the outer periphery of the bearing housing 6501. Specifically, the bearing housing 6501 is fitted on the inner peripheral surface of the annular core back of the stator 5000. A top wall 1401c of the housing 1401 connected to the rear side opening of the pump unit 300 is disposed on the front side of the stator 5000 and supports the bearing housing 6501. A control device (not shown) is disposed between the bottom wall 1401 b of the housing 1401 and the stator 5000. About the structure of the pump part 300, since it is the same as that of 1st Embodiment and 2nd Embodiment, description is abbreviate | omitted.

Next, the cooling structure of the pump device 1000 according to this embodiment will be described. In the present embodiment, oil supplied from an external device flows from the suction port 32 c to the discharge port 32 d by the pump rotor 351, and is sucked into the motor unit 2000 and circulates in the motor unit 2000. By this circulation, the stator 5000 and the rotor 4000 are cooled. Hereinafter, the oil flow path in the pump apparatus 1000 will be described focusing on differences from the first embodiment and the second embodiment.

As shown in FIG. 6, the pump device 1000 includes first flow paths 1a to 1d that connect the pump unit 300 and the housing 1401, and a second flow path 2a that is provided radially inward from the outer peripheral surface of the stator 5000. 2d, a third flow path 3 provided between the stator 5000 and the rotor 4000, and a fourth flow path 4 connected from the third flow path 3 to the negative pressure region in the pump unit 300.

The first flow path 1 of the present embodiment passes through at least one part of the following first flow path 1a to first flow path 1d. The first flow path 1a is located between the bearing housing 6501 and the upper bearing member 421. The first flow path 1 b is a flow path that passes through the inside of the upper bearing member 421. The first flow path 1c is located between the shaft 41 and the upper bearing member 421. The first flow path 1d is located between the shaft 41 and the pump body 311.

Note that the position of the upper bearing member 421 is not limited to the position illustrated in FIG. 6, and the pump body 311 may include the upper bearing member 421. In that case, the first flow path 1 a is provided between the pump body 311 and the upper bearing member 421. Further, the upper bearing member 421 may not be provided, and the pump body 311 may have a sliding bearing structure. In this case, the first flow path passes through the first flow path 1d passing between the shaft 41 and the pump body (bearing member).

Further, the upper bearing member 421 may be a ball bearing. In this case, the first flow path is a first flow path 1b passing between adjacent balls of the ball bearing (bearing member), that is, passing through the inside of the bearing member. In addition, a cutout portion or a through hole may be provided in at least one of the upper bearing member 421, the pump body 311 and the shaft 41 where the first flow path 1a to the first flow path 1d are provided. By providing the notch or the through hole, the flow resistance of the first flow path 1 is reduced, and oil can be sucked from the pump unit 300 to the motor unit 2000 more efficiently.

In the present embodiment, the second flow path is provided radially inward from the outer peripheral surface of the stator 5000. Specifically, as shown in FIG. 6, the second flow path passes through at least one part of the following second flow path 2a to second flow path 2e. The second flow path 2 a is located between the bearing housing 6501 and the lower bearing member (first bearing member) 422. The second flow path 2 b is a flow path that passes through the inside of the lower bearing member (first bearing member) 422. The second flow path 2 c is located between the lower bearing member (first bearing member) 422 and the shaft 41. The second flow path 2d is located between the shaft 41 and the bearing housing 6501. The second flow path 2e is located between the stator 5000 and the bearing housing 6501.

Similarly to the first embodiment (FIG. 3), the second flow path is a through hole 52 b provided in the core back portion 51 of the stator 5000 or a notch provided in the inner peripheral surface of the core back portion 51. You may provide between 51a and the bearing housing 6501. FIG. In FIG. 3, the bearing housing 6502 is illustrated, but the bearing housing 6501 may be read. Instead of the notch 51a, a notch may be provided on the outer peripheral surface of the bearing housing 6501, or both notches may be provided. The oil that has flowed into the second flow path 2 a to the second flow path 2 e flows from the front side to the rear side and is connected to the third flow path 3. Since the 4th flow path 4 is the same as that of 1st Embodiment, description is abbreviate | omitted.

Note that oil may flow from the third flow path 3 to the outer peripheral surface of the rotor yoke 4301 and the inner peripheral surface of the housing 1401. In this case, the oil accumulates on the bottom wall 1401 b of the housing 1401 and eventually flows in the direction of the pump unit 300 between the outer peripheral surface of the rotor yoke 4301 and the inner peripheral surface of the housing 1401. The arrow which shows the flow path between the rotor yoke 4301 and the housing 1401 shown in FIG. 6 has shown the flow path mentioned above.

As in the first and second embodiments, the stator 5000 and the rotor 4000 may be integrally molded products made of resin. When the stator 5000 or the rotor 4000 is an integrally molded product made of resin, the surface area where the stator 5000 or the rotor 4000 comes into contact with oil is increased. For this reason, the inside of the motor unit 2000 can be cooled more efficiently.

According to the present embodiment, the pump device 1000 is located on the shaft 41 rotating around the central axis extending in the axial direction, the motor unit 2000 that rotates the shaft 41, and one side in the axial direction of the motor unit 2000. A pump unit 300 that is driven by the unit 2000 through the shaft 41 and discharges oil, and the motor unit 2000 includes a rotor 4000 that rotates around the shaft 41 and a stator that is disposed to face the rotor 4000. 5000, and a housing 1401 that accommodates the rotor 4000 and the stator 5000. The pump unit 300 includes a pump rotor 351 attached to the shaft 41, a suction port 32c that sucks oil, and a discharge port 32d that discharges oil. And a pump case (3 1 and 321), the first flow path connecting the inside of the pump unit 300 and the inside of the housing 141, the second flow path provided radially inward from the outer peripheral surface of the stator 5000, the stator 5000, and the rotor And a fourth flow path connected to the negative pressure region in the pump unit 300 from the third flow path.

The pump device 1000 uses the pressurization of the pump rotor 351 to flow oil into the motor unit 2000. Here, by providing the second flow path 2a to the second flow path 2e, oil can be efficiently circulated in the motor unit 2000. As described above, a structure in which the rotor 4000 and the stator 5000 are simultaneously cooled can be provided by efficiently circulating oil in the motor unit 2000. That is, it is possible to provide a structure with a high cooling effect for suppressing the temperature rise of the motor.

Fourth embodiment

Next, a pump device according to a fourth embodiment of the present invention will be described. In the fourth embodiment, as in the third embodiment, oil supplied from an external device flows from the suction port 32 c to the discharge port 32 d by the pump rotor and is sucked into the motor unit 201 and circulates in the motor unit 201. Thus, the stator 501 and the rotor 402 are cooled. In the third embodiment, the motor unit 2000 has a configuration of an outer rotor type motor in which the stator 5000 is located on the radially inner side of the rotor 4000. On the other hand, the motor unit 201 in the present embodiment has a configuration of an axial gap type motor in which the stator 501 is disposed to face the rotor 402 in the axial direction. Hereinafter, the difference from the first to third embodiments will be mainly described. In the pump device 101 according to the present embodiment, the same components as those of the pump device according to the first to third embodiments are denoted by the same reference numerals, and description thereof is omitted.

FIG. 7 is a cross-sectional view showing the pump device 101 of this embodiment.
As shown in FIG. 7, the pump device 101 includes a shaft 41, a motor unit 201, a housing 141, and a pump unit 300. The shaft 41 rotates around a central axis J that extends in the axial direction. The motor unit 201 and the pump unit 300 are provided side by side along the axial direction.

The motor unit 201 includes a rotor 402, a stator 501, an upper bearing member (second bearing member) 421, a lower bearing member (first 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 a 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 so as to face the rear side 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 support the shaft 41 rotatably. The upper bearing member (second bearing member) 421 and the lower bearing member (first bearing member) 422 are fixed to the bearing housing 630. The stator 501 includes a plurality of planar fan-shaped cores arranged in the circumferential direction, coils provided in the respective cores, coil lead wires drawn from the coils of the respective cores, and the plurality of cores integrally fixed. And a plurality of lead wire support portions provided at the outer peripheral end of the stator 501.

The housing 141 constitutes a housing of the motor unit 201. A control device (not shown) and a bus bar assembly (not shown) may be accommodated on the rear side (−Z side) of the stator 501. The rotor 402 is accommodated on the rear side (−Z side) of the stator 501. The housing 141 includes a covered cylindrical first housing 121 having an open rear side, and a bottomed cylindrical second housing (cover) 131 connected to the rear side (−Z side) of the first housing 121. The material of the housing 141 is, for example, metal or resin.

The first housing 121 has a disk-shaped top wall 121a, and the shaft 41 is passed through the central portion of the top wall 121a. The bearing housing 630 is fitted into the rear side opening of the pump unit 300. The bearing housing 630 holds the upper bearing member 421 and the lower bearing member 422.

The second housing 131 includes a disc-shaped bottom wall 131a and a cover cylindrical portion 131b extending from the peripheral edge of the bottom wall 131a to 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. For example, the upper bearing member 421 may be included in the pump unit 300 instead of the motor unit 201. The cover cylindrical portion 131 b is fixed to the rear side (−Z side) opening of the first housing 121. More specifically, the first housing 121 and the second housing 131 are fixed by a method such as bolt fastening using the flange portions 111 and 112 of the second housing 131 and the flange portions 113 and 114 of the first housing 121. Is done.

When a control device (not shown) and a bus bar assembly (not shown) are accommodated in the second housing 131, the bottom wall 131a of the second housing 131 is provided with a through hole (not shown) penetrating in the axial direction. A connector (not shown) is attached to the through hole. The connector is provided with an external connection terminal (not shown) extending from the bus bar assembly through the bottom wall 131a to the rear side (-Z side).

The pump unit 300 is located on one side of the motor unit 201 in the axial direction, specifically on the front side (+ Z axis side). The pump unit 300 is driven by the motor unit 201 via the shaft 41. The pump unit 300 includes a pump body 311, a pump rotor 351, and a pump cover 321. The pump rotor 351 includes an inner rotor 371 and an outer rotor 381.

The pump cover 321 has a discharge port 32d. The pump unit 300 is a positive displacement pump as in the first embodiment, and is a trochoid pump in this embodiment. The pump unit 300 is not limited to the trochoid pump, and may be another type of pump as long as it is a positive displacement pump. Since the description about each member which the pump part 300 has is the same as that of 1st Embodiment, it abbreviate | omits. Since the structure of the pump unit 300 is the same as that of the first to third embodiments, the description thereof is omitted.

Next, the cooling structure of the pump device 101 according to this embodiment will be described. In the present embodiment, oil supplied from an external device flows from the suction port 32 c to the discharge port 32 d by the pump rotor 351, and is sucked into the motor unit 201 and circulates in the motor unit 201. This circulation realizes cooling of the stator 501 and the rotor 402. Hereinafter, the oil flow path in the pump device 101 will be described focusing on differences from the third embodiment.

As shown in FIG. 7, the pump device 101 includes first flow paths 11a to 1d that connect the pump unit 300 and the housing 141, and a second flow path 2a that is provided radially inward from the outer peripheral surface of the stator 501. 2e, a third flow path 3) provided between the stator 501 and the rotor 402, and a fourth flow path 4 connected from the third flow path 3 to the negative pressure region in the pump unit.

Since the first flow paths 1a to 1d, the second flow paths 2a to 2e, and the fourth flow path 4 of this embodiment are the same as those of the third embodiment, description thereof is omitted. The third flow path 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 in from the second flow paths 2a to 2e passes through the third flow path 3 and flows into the fourth flow path 4 between the stator 501 and the side surface of the housing 141 (fifth flow path 5).

According to the present embodiment, the pump device 101 is located on the shaft 41 rotating around the central axis extending in the axial direction, the motor unit 201 rotating the shaft 41, and one side in the axial direction of the motor unit 201. A pump unit 300 that is driven by the unit 201 via the shaft 41 and discharges oil. The motor unit 201 includes a rotor 402 that rotates around the shaft 41 and a stator that is disposed to face the rotor 402. 501 and a housing 141 that accommodates the rotor 402 and the stator 501, and the pump unit 300 includes a pump rotor 351 attached to the shaft 41, an intake port 32c that sucks oil, and a discharge port 32d that discharges oil. And a pump case (311 and 321) for accommodating the pump rotor 351. The first flow path 1 connecting the inside of the pump unit 300 and the housing 141, the second flow paths 2a to 2e provided radially inward from the outer peripheral surface of the stator 501, and the space between the stator 501 and the rotor 402 And the fourth flow path 4 connected from the third flow path 3 to the negative pressure region in the pump unit 300.

The pump device 101 uses the pressurization of the pump rotor 351 to flow oil into the motor unit 201. Here, by providing the second flow paths 2a to 2e, oil can be efficiently circulated in the motor unit 201. As described above, it is possible to provide a structure for cooling the rotor 402 and the stator 501 at the same time by efficiently circulating oil in the motor unit 201. That is, it is possible to provide a structure with a high cooling effect for suppressing the temperature rise of the motor.

The stator 501 and the rotor 402 may be integrally molded products made of resin, as in the first to third embodiments. When the stator 501 or the rotor 402 is an integrally molded product made of resin, the surface area with which the stator or rotor comes into contact with oil is increased. For this reason, the inside of the motor part 201 can be cooled more efficiently.

As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

This application claims priority based on Japanese Patent Application No. 2016-195282 filed on September 30, 2016, and uses all the contents described in the Japanese application.

DESCRIPTION OF SYMBOLS 1001 Pump apparatus 1402 Housing 2001 Motor part 300 Pump part 311 Pump body 321 Pump cover 331 Pump chamber 41 Shaft

Claims (19)

A shaft that rotates about a central axis extending in the axial direction;
A motor unit for rotating the shaft;
A pump unit that is located on one side in the axial direction of the motor unit, is driven by the motor unit via the shaft, and discharges oil;
The motor part is
A rotor rotating around the shaft;
A stator disposed opposite the rotor;
A housing for housing the rotor and the stator;
A suction port provided in the housing and configured to suck the oil;
The pump part is
A pump rotor attached to the shaft;
A pump case that houses the pump rotor;
A discharge port provided in the pump case for discharging the oil;
A first flow path for sucking the oil from a suction port of the motor unit;
A second flow path provided radially inward from the outer peripheral surface of the stator;
A third flow path provided between the stator and the rotor;
A fourth flow path that leads from the third flow path to the negative pressure region in the pump section,
The pump device, wherein the pump unit discharges the oil flowing from the fourth flow path to the pump unit from the discharge port. The pump device according to claim 1, wherein the suction port is provided at a bottom portion of the housing. The suction port is provided on a side surface of the housing;
3. The pump device according to claim 1, wherein the suction port is located between one end of the stator opposite to the pump portion in the axial direction and a bottom portion of the housing. The pump device according to claim 3, further comprising a cover member that covers between the one end of the stator opposite to the pump portion in the axial direction and a side surface of the housing. The pump device according to any one of claims 1 to 4, wherein a plurality of the suction ports are provided in the housing. The pump according to any one of claims 1 to 5, wherein the suction port is positioned below or above the shaft when the pump device is arranged with an axial direction horizontal. apparatus. A shaft that rotates about a central axis extending in the axial direction;
A motor unit for rotating the shaft;
A pump unit that is located on one side in the axial direction of the motor unit, is driven by the motor unit via the shaft, and discharges oil;
The motor part is
A rotor rotating around the shaft;
A stator disposed opposite the rotor;
A housing for housing the rotor and the stator,
The pump part is
A pump rotor attached to the shaft;
A pump case provided with a suction port for sucking in the oil and a discharge port for discharging the oil, and containing the pump rotor;
A first flow path connecting the inside of the pump part and the inside of the housing;
A second flow path provided radially inward from the outer peripheral surface of the stator;
A third flow path provided between the stator and the rotor;
And a fourth flow path connected to the negative pressure region in the pump section from the third flow path. The pump case has a pump cover and a pump body,
The pump body has a second bearing member that rotatably supports the shaft,
In the first flow path, the oil is at least one of the space between the shaft and the second bearing member, the space between the second bearing member and the pump body, or the interior of the second bearing member. The pump device according to claim 7, wherein the pump device passes through or part of the pump device. The pump body has a plain bearing structure;
The pump device according to claim 8, wherein the oil passes between the shaft and the pump body in the first flow path. 10. The pump device according to claim 7, wherein in the first flow path, the oil passes between the second bearing member and the pump body. The bearing member is a ball bearing having a plurality of balls,
11. The pump device according to claim 7, wherein the oil passes between the adjacent balls in the first flow path. 11. The pump device according to any one of claims 1 to 11, wherein the second flow path is provided between an inner peripheral surface of the stator and an outer peripheral surface of the shaft. The said 2nd flow path is provided between the through-hole or notch provided in the stator core which the said stator has, and the outer peripheral surface of the said shaft, The any one of Claim 1 thru | or 12 characterized by the above-mentioned. The pump device described in 1. The motor part is
A first bearing member that rotatably supports the shaft;
A cylindrical bearing housing that supports the first bearing member;
The stator is fixed to the bearing housing;
The pump device according to claim 1, wherein the second flow path is provided between an inner peripheral surface of a stator core included in the stator and the bearing housing. The said 2nd flow path is provided between the conduction | electrical_connection part by which the notch part was provided in at least one of the internal peripheral surface of the said stator, or the outer peripheral surface of the said bearing housing, The 1st thru | or 14 characterized by the above-mentioned. The pump device according to any one of the above. The pump device according to any one of claims 1 to 15, wherein the second flow path passes between the shaft and the bearing housing. The pump device according to any one of claims 1 to 16, wherein the second flow path is provided between the first bearing member and the bearing housing. The pump device according to any one of claims 1 to 17, wherein the second flow path passes through the inside of the first bearing member. The pump case has a pump cover and a pump body,
The pump body is opened at both axial ends and the shaft is passed through,
The pump device according to claim 1, wherein the pump rotor is rotated by rotation of the shaft.

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