WO2021187166A1

WO2021187166A1 - Rotating machine

Info

Publication number: WO2021187166A1
Application number: PCT/JP2021/008710
Authority: WO
Inventors: 洋平 ▲高▼橋; 好晴内藤; 貴彦大石
Original assignee: 株式会社明電舎
Priority date: 2020-03-18
Filing date: 2021-03-05
Publication date: 2021-09-23

Abstract

[Problem] A motor system is provided which can improve the circumferential cooling uniformity of a stator.　[Solution] This rotating machine is provided with a first oil path 3b which extends in the direction of the rotation axis, a second oil path 3c which communicates with one end of the first oil path 3b in the rotation axis direction, and a third oil path which communicates with the other end of the first oil path 3b. The second oil path 3c and the third oil path each extends in the circumferential direction around the rotation axis and allows communication between the center part in the circumferential direction and the first oil path 3b. Further, the second oil path 3c and the third oil path are each provided with multiple discharge ports (for example, 3c1) which are aligned in the circumferential direction.

Description

Rotating machine

The present invention relates to a rotating machine.

Conventionally, a stator core and a stator having a winding wound around the stator core, a rotor arranged in a hollow of the stator in a mode of rotating around a rotation axis, a housing for accommodating the stator and the rotor, and an oil pump. Rotating machines equipped with and are known.

For example, the motor as a rotating machine described in Patent Document 1 includes a stator, a rotor, a housing, and an oil pump. The housing of the motor includes two outlets arranged radially outside the stator as discharge ports for discharging the oil sent from the oil pump. One of the spouts ejects oil toward one end of the coil as a winding wound around the stator in the direction of the rotor rotation axis. The other one of the spouts ejects oil toward the other end of the coil in the direction of the rotor rotation axis. The stator in which oil is ejected to each of both ends of the coil is cooled.

Japanese Unexamined Patent Publication No. 2014-30284

With a motor having such a configuration, it may be difficult to uniformly cool the stator in the circumferential direction centered on the rotor rotation axis.

The present invention has been made in view of the above background, and an object of the present invention is to provide a rotating machine capable of improving the cooling uniformity of the stator in the circumferential direction.

One aspect of the present invention includes a stator core, a stator having a winding wound around the stator core, a rotor arranged in a hollow of the stator in a mode of rotating about a rotation axis, the stator, and the above. A housing for accommodating a rotor and an oil pump, the housing is arranged radially outside the stator about the rotation axis, and one end of the winding in the rotation axis direction. A rotary machine including at least two discharge ports for individually discharging oil toward each of the other end portions, wherein the housing is arranged outside the stator in the radial direction and in the direction of the rotation axis. It is arranged in a region on one side of the rotation axis direction and a first oil passage extending in the circumferential direction, and is arranged in a region on the other side of the rotation axis direction. A third oil passage extending in the circumferential direction is provided, and one end of the first oil passage in the direction of the rotation axis and a central portion of the second oil passage in the circumferential direction communicate with each other. The other end of the first oil passage in the direction of the rotation axis and the central portion of the third oil passage in the circumferential direction communicate with each other, and the second oil passage and the third oil passage Each of them is characterized by including a plurality of the discharge ports arranged in the circumferential direction.

According to the present invention, there is an excellent effect that the cooling uniformity of the stator in the circumferential direction can be improved.

It is sectional drawing which shows the stator and the rotor of the motor system which concerns on embodiment. It is a perspective view which shows the motor system. It is a vertical sectional view of the motor system. It is a perspective view which shows the upper part of the motor system from one side in the direction of the rotation axis. It is an enlarged perspective view which shows the 2nd oil passage provided in the motor housing of the motor system, and the periphery thereof enlarged. It is a perspective view which shows the upper part of the motor system with the inverter removed from the other side in the direction of the rotation axis. It is an enlarged perspective view which shows the 3rd oil passage provided in the same housing and its surroundings in an enlarged manner. It is a perspective view which shows the motor housing, the oil cooler, and the electric oil pump of the motor system from the other side in the direction of the rotation axis. It is a perspective view which shows the motor housing, the oil cooler, and the electric oil pump on the other side in the direction of the rotation axis and from an angle different from that of FIG. It is a cross-sectional view which shows the fracture surface of the motor housing, the oil cooler, and the electric oil pump at the positions of the suction part and the discharge part in the rotation axis direction of the electric oil pump from one side in the rotation axis direction. .. It is a cross-sectional view which shows the fracture surface which broke the motor housing, the oil cooler, and the electric oil pump at the position of the outflow part in the rotation axis direction of the oil cooler from one side in the rotation axis direction.

Hereinafter, an embodiment of a motor system as a rotary machine system to which the present invention is applied will be described with reference to each figure.

FIG. 1 is a cross-sectional view showing a stator 5 and a rotor 7 of a motor system according to an embodiment. The stator 5 includes a cylindrical stator core 5a and a flat wire coil 5b that is a winding wound around the stator core 5a. The rotor 7 is arranged in the hollow of the stator core 5a, and includes a rotor core 7a and a plurality of permanent magnets 7b embedded in the rotor core 7a in a manner arranged in the circumferential direction about the rotation axis L of the rotor 7. In FIG. 1, hatching to be attached to the cross section of the flat wire coil 5b is omitted.

FIG. 2 is a perspective view showing the motor system 1 according to the embodiment. In FIG. 2, the motor cover, which will be described later, is omitted in order to visualize the internal configuration of the motor unit 2. The motor system 1 includes a motor unit 2 which is a rotary machine, an inverter 50, an electric oil pump 80, and an oil cooler 90.

The motor unit 2 includes a rotatable shaft 6. The shaft 6 is rotatably supported around the rotation axis L indicated by the alternate long and short dash line in the drawing. The rotor 7 rotates integrally with the shaft 6. The extending direction of the rotation axis L is an example of the rotation axis direction in the present invention. The arrow A direction in FIG. 2 is an example of one side in the direction of the rotation axis. Further, the arrow B direction in FIG. 2 is an example of the other side in the rotation axis direction.

The motor unit 2 which is a rotating machine is composed of an IPM (Interior Permanent Magnet) motor, and includes a motor housing 3, a stator 5, a rotor 7, and the like in addition to the shaft 6. The motor housing 3 is provided with a cylindrical hollow. The above-mentioned hollow has openings at each end on the side in the direction of arrow A (one side in the direction of the rotation axis) and the end on the side in the direction of arrow B (the other side in the direction of the rotation axis). The opening at the end on the side of the arrow A is closed by a motor cover (not shown). Further, the opening at the end on the arrow B direction side is closed by the inverter housing 55 described later.

One side of the inverter housing 55 in the direction of the rotation axis accommodates the ball bearing 8 and the like of the motor unit 2, and therefore also serves as the motor housing.

The motor housing 3 accommodates the stator 5, the shaft 6, and the rotor 7 in a cylindrical hollow. The shaft 6 and the rotor 7 are arranged in the hollow of the cylindrical stator core 5a. However, one end of the shaft 6 in the rotation axis direction protrudes from one end of the stator core 5a in the longitudinal direction, and the other end of the shaft 6 in the rotation axis direction protrudes from the other end of the stator core 5a in the longitudinal direction.

One side of the motor housing 3 and the inverter housing 55 in the direction of the rotation axis is provided with an oil storage portion 3a for storing oil inside. The motor system 1 is designed on the premise that the oil storage unit 3a is arranged in a posture facing downward in the vertical direction (hereinafter referred to as a normal posture). Hereinafter, in the motor system 1 arranged in the normal posture, the lower portion in the vertical direction is referred to as the lower portion, and the upper portion is referred to as the upper portion with respect to the motor system 1, the motor housing 3, and the inverter housing 55 described later. ..

A certain amount of oil is stored in the internal space of the motor housing 3 and the internal space on one side of the inverter housing 55 in the direction of the rotation axis. In the motor system 1 arranged in the normal posture, the oil stored on one side of the motor housing 3 and the inverter housing 55 in the rotation axis direction flows into the oil storage portion 3a by gravity and is stored.

FIG. 3 is a vertical cross-sectional view of the motor system 1. Also in FIG. 3, the motor cover that closes the opening in the direction of arrow A in the motor housing 3 is not shown. Hereinafter, the circumferential direction centered on the rotation axis L is simply referred to as a circumferential direction. Further, the radial direction centered on the rotation axis L is simply referred to as the radial direction.

The shaft 6 is fitted into a through hole provided in the center of the rotor core 7a. Each of the arrow A direction side (one side) and the arrow B direction side (the other side) of the shaft 6 is rotatably supported by the ball bearing 8.

The motor unit 2 and the inverter 50 are adjacent to each other in the direction of the rotation axis. The inverter 50 supplies electric power of a three-phase power supply to the motor unit 2 at a frequency based on the command according to a command sent from a higher-level device such as an ECU (Engine Control Unit) of the vehicle. The inverter 50 including the inverter cover 51, the control board 52, and the inverter housing 55 is arranged on the opposite side (arrow B direction side) of the motor unit 2 in the direction of the rotation axis.

Each of the inverter cover 51 and the inverter housing 55 is a cast product having a hollow structure. The inverter housing 55 includes a partition wall 55a on one side in the direction of the rotation axis (the side in the direction of arrow A). The partition wall 55a closes the opening on the other side (arrow B direction side) of the motor housing 3 in the direction of the rotation axis, and separates the motor unit 2 from the inverter 50.

The control board 52 is arranged in the hollow on the other side of the inverter housing 55 in the direction of the rotation axis. The other side of the inverter housing 55 in the direction of the rotation axis is open toward the other side. This opening is closed by the inverter cover 51.

The motor housing 3 includes a first oil passage 3b for distributing oil. The first oil passage 3b is arranged outside the stator 5 in the radial direction and extends in the rotation axis direction of the rotor 7. In the present invention, the mode extending in the rotation axis direction includes a mode extending strictly along the rotation axis direction and a mode extending in a direction inclined to less than 45 [°] from the rotation axis direction.

FIG. 4 is a perspective view showing the upper part of the motor system 1 from one side in the direction of the rotation axis. The motor housing 3 is provided with a second oil passage 3c leading to the first oil passage 3b at an end on one side (arrow A direction side) in the direction of the rotation axis. The second oil passage 3c shown in FIGS. 3 and 4 has an opening on one side (arrow A direction side) in the direction of the rotation axis, and this opening is closed by a motor cover (not shown).

FIG. 5 is an enlarged perspective view showing the second oil passage 3c and its surroundings in an enlarged manner. The oil after passing through the oil storage section (3a in FIG. 3) and the electric oil pump (80 in FIG. 2) flows into the first oil passage 3b. Further, the oil after passing through the first oil passage 3b flows into the second oil passage 3c. The second oil passage 3c includes a discharge port 3c1. In FIG. 4, the discharge port 3c1 of the second oil passage 3c is a region of the stator 5 opposite to the region facing the oil storage portion (3a in FIG. 3) (the region facing downward in the normal posture). Discharge toward (the area facing upward in the normal posture). In the motor system 1 installed in the normal posture, the discharge port 3c1 of the second oil passage 3c is located above the stator 5, and the oil is discharged toward the stator 5 located below.

FIG. 6 is a perspective view showing the upper part of the motor system 1 with the inverter (50 in FIG. 3) removed from the other side in the direction of the rotation axis. The motor housing 3 includes a third oil passage 3d leading to the first oil passage 3b at the end on the other side (arrow B direction side) in the direction of the rotation axis. The third oil passage 3d shown in FIG. 6 has an opening on the other side (arrow B direction side) in the direction of the rotation axis, and this opening is closed by the inverter housing (55 in FIG. 3).

FIG. 7 is an enlarged perspective view showing the third oil passage 3d and its surroundings in an enlarged manner. Oil flows into the third oil passage 3d via the first oil passage 3b. The third oil passage 3d includes a discharge port 3d1. In FIG. 6, the discharge port 3d1 of the third oil passage 3d is a region of the stator 5 opposite to the region facing the oil storage portion (3a in FIG. 3) (the region facing downward in the normal posture). Discharge toward (the area facing upward in the normal posture). In the motor system 1 installed in the normal posture, the discharge port 3d1 of the third oil passage 3d is located above the stator 5, and the oil is discharged toward the stator 5 located below.

According to the motor system 1 having such a configuration, the cooling uniformity of the stator 5 in the rotation axis direction can be improved as compared with the configuration in which the discharge port is provided in only one region in the rotation axis direction of the motor housing 3.

As shown in FIG. 3, the discharge port 3c1 of the second oil passage 3c discharges oil toward the end of the flat wire coil 5b of the stator 5 on one side (arrow A direction side) in the direction of the rotation axis. Is placed in. Further, the discharge port 3d1 of the third oil passage 3d is arranged so as to discharge oil toward the other end (arrow B direction side) of the flat wire coil 5b of the stator 5 in the direction of the rotation axis. The flat wire coil 5b made of a metal material having high thermal conductivity is arranged over the entire area in the rotation axis direction of the stator 5. The discharge port 3c1 of the second oil passage 3c discharges oil toward one end of the flat wire coil 5b, and the discharge port 3d1 of the third oil passage 3d faces the other end of the flat wire coil 5b. By discharging the oil, the heat of the stator 5 is efficiently and uniformly conducted to the oil in the direction of the rotation axis. Therefore, according to the motor system 1, the cooling uniformity of the stator 5 in the direction of the rotation axis can be improved more satisfactorily.

FIG. 8 is a perspective view showing the motor housing 3, the oil cooler 90, and the electric oil pump 80 from the other side in the direction of the rotation axis. As described above, the motor housing 3 includes a discharge port 3c1 in a region on one side (arrow A direction side) in the direction of the rotation axis. Further, the motor housing 3 includes a discharge port 3d1 in a region on the other side (arrow B direction side) in the direction of the rotation axis. In addition, the motor housing 3 also includes a discharge port 3b1 in a central region in the direction of the rotation axis. That is, the motor housing 3 is provided with discharge ports (3b1, 3c1, 3d1) in each of the one-sided region, the other-side region, and the central region in the direction of the rotation axis. Each of the two discharge ports 3c1 arranged in the central region in the rotation axis direction leads to the central region in the rotation axis direction in the first oil passage (3b) and faces the center in the rotation axis direction of the stator (5). And discharge the oil. According to the motor system 1 having such a configuration, the cooling uniformity of the stator 5 in the rotation axis direction can be further improved by providing the discharge port 3b1 in the central region in the rotation axis direction.

The second oil passage 3c shown in FIG. 5 extends in the circumferential direction, and the central portion in the circumferential direction communicates with one end (the end in the arrow A direction) of the first oil passage 3b in the rotation axis direction. In the present invention, the mode extending in the circumferential direction includes a mode extending with a curvature centered on the rotation axis L and a mode extending in an arc shape with a curvature centered at a position deviated from the rotation axis L.

The second oil passage 3c includes five discharge ports 3c1 arranged in the circumferential direction. The five discharge ports 3c1 of the second oil passage 3c discharge oil toward different regions in the circumferential direction of the stator (5 in FIG. 2).

As shown in FIG. 7, the third oil passage 3d extends in the circumferential direction, and the central portion in the circumferential direction communicates with the other end (the end in the arrow B direction) of the first oil passage 3b in the rotation axis direction. Further, the third oil passage 3d includes five discharge ports 3d1 arranged in the circumferential direction. The five discharge ports 3d1 of the third oil passage 3d discharge oil toward different regions in the circumferential direction of the stator (5 in FIG. 2).

That is, the five discharge ports 3c1 of the second oil passage 3c discharge oil toward different regions in the circumferential direction in the stator (5 in FIG. 2), and the five discharge ports 3d1 of the third oil passage 3d , The oil is discharged toward different regions in the circumferential direction of the stator. According to the motor system 1 having such a configuration, it is possible to improve the cooling uniformity of the stator in the circumferential direction.

In the second oil passage 3c shown in FIG. 5, the oil pressure gradually decreases from the center side to the end side in the circumferential direction, so the amount of oil discharged from the discharge port 3c1 toward the end side from the center side. Tends to decrease. Therefore, in the second oil passage 3c, the diameter of the discharge port 3c1 is different depending on the position in the circumferential direction. Specifically, of the five discharge ports 3c1 in the second oil passage 3c, the diameter of the discharge port 3c1 located at the center in the circumferential direction is the smallest. Further, the diameters of the two discharge ports 3c1 adjacent to each other on both sides in the circumferential direction with respect to the central discharge port 3c1 are larger than the diameter of the central discharge port 3c1. Further, the diameters of the discharge ports 3c1 located at both ends in the circumferential direction are larger than the diameters of the two discharge ports 3c1 described above. That is, the diameter of the discharge port 3c1 gradually increases in the order of arrangement from the discharge port 3c1 located at the center in the circumferential direction to the discharge port 3c1 located at the end in the circumferential direction. As a result, the discharge amount at each of the five discharge ports 3c1 can be made uniform.

Also in the third oil passage 3d shown in FIG. 7, the diameter of the discharge port 3d1 gradually increases in the order of arrangement from the discharge port 3d1 located at the center in the circumferential direction to the discharge port 3d1 located at the end in the circumferential direction. As a result, the discharge amount at each of the five discharge ports 3d1 can be made uniform.

According to the motor system 1, in each of the second oil passage 3c and the third oil passage 3d, by equalizing the oil discharge amount at each of the five discharge ports (3c1, 3d1), the stator (stator in the circumferential direction) ( The cooling uniformity of 5) in FIG. 2 can be improved more satisfactorily.

FIG. 9 is a perspective view showing the motor housing 3, the oil cooler 90, and the electric oil pump 80 on the other side in the direction of the rotation axis and from an angle different from that in FIG. A fourth oil passage 3e leading to the oil storage portion 3a is provided in the lower portion of the motor housing 3.

FIG. 10 shows a fracture surface of the motor housing 3, the oil cooler 90, and the electric oil pump 80 cut at the positions of the suction portion 80a and the discharge portion 80b in the rotation axis direction of the electric oil pump 80 on one side in the rotation axis direction. It is a cross-sectional view shown from. In FIG. 10, the internal structures of the oil cooler 90 and the electric oil pump 80 are not shown.

The fourth oil passage 3e shown in FIG. 9 leads to the suction portion 80a of the electric oil pump 80 as shown in FIG. Further, the motor housing 3 includes a fifth oil passage 3f that leads from the discharge portion 80b of the electric oil pump 80 to the inflow portion 90a of the oil cooler 90.

FIG. 11 is a cross-sectional view showing a fracture surface of the motor housing 3, the oil cooler 90, and the electric oil pump 80 at the position of the outflow portion 90b in the rotation axis direction of the oil cooler 90 from one side in the rotation axis direction. Is. As shown in the figure, the motor housing 3 includes a sixth oil passage 3g leading from the outflow portion 90b of the oil cooler 90 to the central portion in the first oil passage 3b in the direction of the rotation axis.

As described with reference to FIGS. 9 to 11, the motor housing 3 extends from the oil storage portion 3a through the electric oil pump 80 and the oil cooler 90 to the respective discharge ports (3c1, 3b1, 3d1). It is equipped with all the oil flow paths. According to the motor system 1 having such a configuration, the oil can be circulated without providing a pipe for forming a circulation path for circulating the oil in the oil cooler 90 and in the motor unit 2 outside the motor. The productivity of the motor system 1 can be improved.

The oil stored in the oil storage unit 3a is sucked into the fourth oil passage 3e through the opening of the fourth oil passage 3e shown in FIG. 9 by the suction force of the electric oil pump 80, and then is shown in FIG. It is sucked into the suction portion 80a of the electric oil pump 80. After that, the oil is discharged from the discharge portion 80b of the electric oil pump 80, moves in the fifth oil passage 3f from the lower part to the upper part of the motor housing 3, and enters the oil cooler 90 through the inflow portion 90a of the oil cooler 90. Inflow.

The oil cooler 90 includes a refrigerant passage (not shown) and an oil flow path adjacent to the refrigerant passage in the housing. Refrigerants such as coolant sent from the outside pass through the refrigerant path. The oil that has flowed into the oil cooler 90 is cooled by heat exchange with the refrigerant in the refrigerant path in the process of flowing through the oil flow path. The cooled oil flows out from the outflow portion 90b of the oil cooler 90 and flows into the sixth oil passage 3g, as shown in FIG. 11, and then from the sixth oil passage 3g in the direction of the rotation axis of the first oil passage 3b. It flows into the central part of.

The oil that has flowed into the central portion of the first oil passage 3b in the direction of the rotation axis is divided into oil that flows along the first path, oil that flows along the second path, and oil that flows along the third path. The oil flowing along the first path is discharged from the discharge port 3b1 leading to the center of the first oil passage 3b in the rotation axis direction, and adheres to the center of the outer peripheral surface of the stator 5 in the rotation axis direction. Further, the oil flowing along the second oil passage flows through the first oil passage 3b from the other side to one side (from the B side to the A side) along the rotation axis direction, and then passes through the second oil passage 3c. It is discharged from the discharge port 3c1 via. Then, the above-mentioned oil adheres to one side end portion (end portion on the arrow A direction side) of the flat wire coil 5b of the stator 5 in the rotation axis direction. The oil flowing along the third oil passage flows through the first oil passage 3b from one side to the other side (from A side to AB) along the rotation axis direction, and then passes through the third oil passage 3d. Discharge from the discharge port 3d1. Then, the above-mentioned oil adheres to the other side end portion (end portion on the arrow B direction side) of the flat wire coil 5b of the stator 5 in the rotation axis direction.

Although the example in which the present invention is applied to the motor unit 2 as a rotating machine has been described, the present invention may be applied to a generator (dynamo) as a rotating machine.

The present invention is not limited to the above-described embodiment, and a configuration different from the embodiment may be adopted within the range to which the configuration of the present invention can be applied. The present invention exerts a peculiar action and effect for each aspect described below.

[First aspect]
The first aspect is centered on a stator core (for example, a stator core 5a), a stator (for example, a stator 5) having a winding (for example, a flat wire coil 5b) wound around the stator core, and a rotation axis (for example, a rotation axis L). A rotor (for example, a rotor 7) arranged in the hollow of the stator, a housing for accommodating the stator and the rotor (for example, a motor housing 3), and an oil pump (for example, an electric oil pump) are provided. , The housing is arranged outside the stator in the radial direction about the rotation axis, and oil is applied to each of one end and the other end of the winding in the rotation axis direction. A rotary machine (for example, a motor unit 2) having at least two discharge ports (for example, discharge ports 3c1 and 3d1) for individually discharging, wherein the housing is arranged outside the stator in the radial direction and the rotation is performed. A first oil passage extending in the axial direction (for example, the first oil passage 3b) and a second oil passage (for example, a second oil passage) arranged in a region on one side of the rotation axis direction and extending in the circumferential direction around the rotation axis. An oil passage 3c) and a third oil passage (for example, a third oil passage 3d) arranged in a region on the other side of the rotation axis direction and extending in the circumferential direction are provided, and the rotation axis direction in the first oil passage. The one-sided end and the circumferential central portion of the second oil passage communicate with each other, and the other end of the first oil passage in the rotation axis direction and the third oil passage. The second oil passage and the third oil passage each include a plurality of the discharge ports arranged in the circumferential direction so as to communicate with each other.

In the first aspect, the plurality of discharge ports of the second oil passage discharge oil toward different regions in the circumferential direction of the stator, and the plurality of discharge ports of the third oil passage are mutually circumferentially oriented in the stator. Discharge oil to different areas. According to such a configuration, the cooling uniformity of the stator in the circumferential direction can be improved.

[Second aspect]
The second aspect comprises the configuration of the first aspect, wherein the housing communicates with a central region of the first oil passage in the direction of the rotation axis and discharges oil toward the center of the stator in the direction of the rotation axis. It is a rotating machine characterized by having a discharge port.

According to the second aspect, by providing the discharge port in the central region of the housing in the direction of the rotation axis, the cooling uniformity of the stator in the direction of the rotation axis can be further improved.

[Third aspect]
The third aspect comprises the configuration of the first aspect or the second aspect, and in each of the second oil passage and the third oil passage, the discharge port located at the center of the circumferential direction among the plurality of discharge ports. The rotary machine is characterized in that the diameter of the discharge port gradually increases in the order of arrangement from the outlet to the discharge port located at the end in the circumferential direction.

According to the third aspect, the cooling uniformity of the stator in the circumferential direction is achieved by making the oil discharge amount uniform for each of the plurality of discharge ports of the second oil passage and the plurality of discharge ports of the third oil passage. Can be improved better.

[Fourth aspect]
The fourth aspect includes the configuration of any one of the first to third aspects and an oil cooler, and the housing has an oil storage portion for storing oil and an oil cooler for cooling the oil (for example, an oil cooler 90). And the oil from the fourth oil passage (for example, the fourth oil passage 3e) leading from the oil storage portion to the suction portion (for example, the suction portion 80a) of the oil pump and the discharge portion (for example, the discharge portion 80b) of the oil pump. The fifth oil passage (for example, the fifth oil passage 3f) leading to the inflow portion (for example, the inflow portion 90a) of the cooler and the outflow portion (for example, the outflow portion 90b) of the oil cooler in the direction of the rotation axis in the first oil passage. A sixth oil passage (for example, a sixth oil passage 3g) leading to a central portion is provided, and the oil storage portion is arranged in a region of the housing opposite to the first oil passage in the circumferential direction. It is a rotating machine.

According to the fourth aspect, it is possible to circulate the oil without providing a pipe for forming a circulation path for circulating the oil inside the oil cooler and inside the rotating machine, and thus the production of the rotating machine. The sex can be improved. Further, according to the fourth aspect, in the rotating machine installed in the normal posture, the oil discharged from the downwardly facing discharge port is sprayed onto the stator located below the discharge port, and then on the surface of the stator. Can be moved downward in the direction of gravity to efficiently cool the stator.

The present invention claims priority based on Japanese Patent Application No. 2020-047409, which is a Japanese patent application filed on March 18, 2020, and incorporates all the contents described in the Japanese patent application.

1: Motor system (rotary machine system), 2: Motor part (rotary machine), 3: Motor housing (part of housing), 3a: Oil storage part, 3b: First oil passage, 3b1: Discharge port, 3c : 2nd oil passage, 3c1: discharge port, 3d: 3rd oil passage, 3d1: discharge port, 3e: 4th oil passage, 3f: 5th oil passage, 3g: 6th oil passage, 5: stator, 5a: Stator core, 5b: Flat wire coil (winding), 6: Shaft, 7: Rotor, 7a: Rotor core, 7b: Permanent magnet, 55: Inverter housing (part of housing), 80: Electric oil pump, 80a: Suction part , 80b: Discharge part, 90: Oil cooler, 90a: Inflow part, 90b: Outflow part

Claims

A stator core, a stator having a winding wound around the stator core, a rotor arranged in a hollow of the stator in a mode of rotating about a rotation axis, a housing accommodating the stator and the rotor, and the like. Equipped with an oil pump
The housing is arranged outside the stator in the radial direction about the rotation axis, and oil is individually directed toward one end and the other end of the winding in the rotation axis direction. A rotary machine having at least two discharge ports for discharging to.
The housing
A first oil passage that is arranged outside the stator in the radial direction and extends in the direction of the rotation axis.
A second oil passage arranged in a region on one side in the direction of the rotation axis and extending in the circumferential direction centered on the rotation axis,
It is arranged in the region on the other side in the direction of the rotation axis, and has a third oil passage extending in the circumferential direction.
One end of the first oil passage in the direction of the rotation axis and the central portion of the second oil passage in the circumferential direction communicate with each other.
The other end of the first oil passage in the direction of the rotation axis and the central portion of the third oil passage in the circumferential direction communicate with each other.
A rotary machine characterized in that each of the second oil passage and the third oil passage includes a plurality of the discharge ports arranged in the circumferential direction.
The first aspect of the present invention is characterized in that the housing is provided with a discharge port that communicates with a central region of the first oil passage in the direction of the rotation axis and discharges oil toward the center of the stator in the direction of the rotation axis. The rotating machine described.
In each of the second oil passage and the third oil passage, among the plurality of discharge ports, the discharge port located at the center in the circumferential direction to the discharge port located at the end in the circumferential direction are arranged in this order. The rotary machine according to claim 1 or 2, wherein the diameter of the discharge port is gradually increased.
Equipped with an oil cooler to cool the oil
The housing has an oil storage section for storing oil, a fourth oil passage leading from the oil storage section to the suction section of the oil pump, and a fifth oil leading from the discharge section of the oil pump to the inflow section of the oil cooler. A road and a sixth oil passage leading from an outflow portion of the oil cooler to a central portion in the first oil passage in the direction of the rotation axis are provided.
The rotary machine according to any one of claims 1 to 3, wherein the oil storage portion is arranged in a region of the housing opposite to the first oil passage in the circumferential direction.