Liquid-cooled type motor

Abstract

To provide a liquid-cooled type motor capable of preventing damage or deformation of component members due to forces generated by different materials for a housing and a stator.SOLUTION: A liquid-cooled type motor includes: a housing 3; a rotor 8 rotating around an axis relative to the housing 3; a stator 9 that is fixed to the housing and generating a magnetic force for the rotor 8 to rotate, and at least one portion of which is made of a material having a linear expansion coefficient different from that of the housing 3; a partition wall 4 provided along a direction of an axial line between the rotor 8 and the stator 9 for partitioning a flow path to which a coolant liquid is supplied in the housing; partition support portions 11, 11 provided along the partition wall 4 so as to support a portion not overlapped with the stator 9 in a direction of the axial line of the partition wall 4; and a buffer portion 12 that is interposed between the housing 3 and the partition support portions 11, 11, and is formed of a small material having a small elasticity rate compared to the housing 3 and the partition support portions 11, 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a liquid-cooled motor in which a stator is cooled with a cooling liquid. [Background technology]

[0002] In recent years, the electrification of aircraft and automobiles has led to a demand for motors that are lightweight and have high output (high power density). This has resulted in a high heat density in the stator coil, which causes the motor temperature to rise, becoming a problem. To address this issue, a method is used in which a cooling liquid is passed through the inside of the stator to directly cool the stator coil.

[0003] In the cooling method, as shown in FIG. 1 of Patent Document 1, for example, a sealing means is disposed between the stator and the rotor as a partition wall separating the two, thereby creating an enclosed space on the stator side.

[0004] Incidentally, to achieve high power density in a motor, high torque and high efficiency are required. To achieve this, the air gap between the stator and rotor is important. Since this air gap is directly linked to the performance of the motor, fiber reinforced plastic (FRP), which is non-magnetic and can be formed into a thin cylindrical shape, is used for the partition.

[0005] Pressure acts from the radial outside to the radial inside on the partition wall that creates a sealed space on the stator side as cooling liquid circulates in the sealed space. For this reason, the partition wall is attached (fixed) to the stator core by close fitting and / or pressure fitting. In the coil end portion where the partition wall cannot be attached to the stator core, a support means (protrusion) as a partition wall support portion is arranged in the portion corresponding to the coil end portion (protruding axially outward from the end face of the stator core) to mechanically support the partition wall. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6603737 Summary of the Invention [Problem to be solved by the invention]

[0007] In particular, if an aluminum alloy, for example, is used for the casing that houses the motor to achieve the lightweight design required for electric aircraft applications and used over a wide temperature range, forces will be generated in the thin-walled bulkhead and bulkhead support parts due to forced displacement caused by the difference in linear expansion between the stator (stator core) made of a magnetic material, which could result in damage or deformation of the constituent parts such as the bulkhead and bulkhead support parts.

[0008] SUMMARY OF THE PRESENT EMBODIMENTS An object of the present invention is to provide a liquid-cooled motor that can prevent damage or deformation of components due to forces generated due to the housing and stator being made of different materials. [Means for solving the problem]

[0009] The liquid-cooled motor of the present invention comprises a housing, a rotor that rotates about an axis relative to the housing, and a stator that is fixed to the housing and generates a magnetic force on the rotor for said rotation, the stator having at least a portion formed of a material having a different linear expansion coefficient from the housing, a partition provided between the rotor and the stator along the axial direction to define a flow path through which cooling liquid passes within the housing, a partition support provided along the partition to support a portion of the partition that does not overlap with the stator in the axial direction, and a buffer portion interposed between the housing and the partition support portion, the buffer portion being formed of a material having a smaller elastic modulus than the housing and the partition support portion.

[0010] According to the present invention, by providing a buffer between the housing and the partition support, the buffer can buffer the force resulting from the housing and the stator being made of different materials, thereby preventing damage or deformation of components such as the partition and the partition support.

[0011] In the liquid-cooled motor of the present invention, the stator may be located radially outwardly of the rotor, and the partition wall support portion may be provided radially outwardly of the partition wall.

[0012] As described above, by providing the partition support portion on the radially outer side of the partition, a sealing member is not required on the radially inner side of the partition, and only the partition along the axial direction is present on the radially inner side of the stator. This allows the radially inner side of the partition to be in a flat state, so that even if the cooling liquid leaks from the partition to the radially inner side of the partition, a mechanism for discharging the cooling liquid along the radially inner side of the partition to the outside of the housing is easy. In addition, since the leaked cooling liquid is easily able to move along the radially inner side of the partition, the cooling liquid is less likely to accumulate in the gap between the partition and the rotor. This reduces the frictional force caused by the accumulated cooling liquid when the rotor rotates. Furthermore, it is possible to prevent the motor from burning out due to heat generated by friction with the leaked cooling liquid when the rotor rotates.

[0013] In the liquid-cooled motor of the present invention, the buffer portion may be an O-ring provided around the entire periphery of the partition wall support portion.

[0014] As described above, by using an O-ring, a highly versatile configuration can be achieved.

[0015] In addition, in the liquid-cooled motor of the present invention, the partition support portion may be formed by combining a plurality of members, and at least one of the plurality of members may be formed of a material different from the other members.

[0016] According to the above configuration, the partition support portion can be made of a material suitable for the required function in accordance with the relationship with other components of the motor.

[0017] In the liquid-cooled motor of the present invention, at least two of the plurality of members may be combined in a radial direction.

[0018] According to the above configuration, when the required function differs in the radial direction, an appropriate material can be selected for each portion. Effect of the Invention

[0019] According to the present invention, since the force resulting from the housing and stator being made of different materials can be mitigated by the buffer section, a liquid-cooled motor can be provided in which damage or deformation of components such as the partition wall and partition wall support section can be prevented. [Brief description of the drawings]

[0020] [Figure 1] 1 is a vertical sectional view of a liquid-cooled motor according to the present invention; [Diagram 2] FIG. 2 is an enlarged view of a portion II in FIG. [Diagram 3] 1. FIG. 4 is an enlarged view showing another form of part II in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] An embodiment of a liquid-cooled motor (hereinafter simply referred to as a motor) of the present invention will be described with reference to the drawings.

[0022] As shown in Fig. 1, the motor 1 includes a housing 3 for housing a motor unit 2 that generates power. Inside the housing 3, a partition wall 4 is provided for forming a space for flowing a cooling liquid. The housing 3 is made of, for example, aluminum or an aluminum alloy in order to reduce weight. In the following description, the direction along the axis of a rotating shaft 5 (described later) in Fig. 1 is defined as the axial direction, and the direction perpendicular to the axial direction (the vertical direction in Fig. 1) is defined as the radial direction.

[0023] The housing 3 is provided with an inlet IN and an outlet OUT for the cooling liquid. A guide pipe (not shown) is connected to the inlet IN for guiding the cooling liquid supplied by a pump (not shown) from a tank (not shown) that is an external storage unit for storing the cooling liquid, and a discharge pipe (not shown) is connected to the outlet OUT for returning the cooling liquid, which has cooled the stator coil 92 described below, to the tank. In this embodiment, cooling oil is used as the cooling liquid, but water or other various cooling media may also be used.

[0024] Motor 1 is configured as an inner rotor type, with rotor 8 (described later) attached radially inside stator 9 (described later) so as to rotate integrally with rotating shaft 5 that is rotatably supported approximately at the center within housing 3. Motor 1 may be used, for example, as an electric motor for aircraft or automobiles, as a drive source for actuators such as robots, as a drive source for pumps or compressors, as a flywheel power storage device, or for other purposes.

[0025] As shown in Fig. 1, the housing 3 includes a cylindrical housing body 31 and a pair of lids 32, 33 for closing openings at both axial ends of the housing body 31. An inlet IN for the cooling liquid is formed at one of both axial ends of the housing body 31 (upper and right side in Fig. 1), and an outlet OUT for the cooling liquid is formed at the other axial end of the housing body 31 (upper and left side in Fig. 1). The cooling liquid from the inlet IN for the cooling liquid enters an annular inlet side space K1 formed by the partition support part 11, the lid 33, the housing body 31, the stator core 91, the stator coil 92, and the buffer part 12, cools a stator coil 92 described later, and then enters the right end of a plurality of flow paths (not shown) formed to penetrate the stator core 91 in the left-right direction. The cooling liquid that enters the right-hand ends of the multiple flow paths is discharged from their respective left-hand ends into the annular outlet side space K2 formed by the partition support part 11, the cover body 32, the housing main body 31, the stator core 91, the stator coil 92, and the buffer part 12, and is discharged to the outlet OUT that communicates with the outlet side space K2.

[0026] A pair of through holes 31A, 31B that axially penetrate the rotating shaft 5 are formed in the radial centers of the pair of cover bodies 32, 33, and a pair of left and right bearings 6, 7 that rotatably support the rotating shaft 5 that penetrates the through holes 31A, 31B are fitted into the through holes 31A, 31B. In addition, a pair of annular flange portions 31C, 31D that protrude axially inward and are positioned opposite each other in the axial direction are formed in the pair of cover bodies 32, 33.

[0027] The motor unit 2 includes a rotor 8 fitted onto the rotating shaft 5 so as to rotate integrally with the housing 3 around the axis X, and a stator 9 disposed between the partition wall 4 and the housing main body 31. In other words, the stator 9 is located radially outward of the rotor 8. The rotor 8 has a plurality of permanent magnets (not shown) arranged along the circumferential direction. In this embodiment, a permanent magnet type rotor is used, but any type of rotor may be used, such as a wound rotor or a cage rotor of an induction machine.

[0028] The stator 9 generates a magnetic force for rotating the rotor 8, and includes a stator core 91 that constitutes a plurality of magnetic poles, a stator coil 92 that is attached to the stator core 91, and an insulating member (not shown) that provides insulation between the stator core 91 and the stator coil 92. The stator core 91 is made of a laminate of electromagnetic steel sheets that is made of iron, which is a material (metal) different from the housing 3. In other words, the stator 9 is made of a material that has a different linear expansion coefficient from the housing 3. In this embodiment, the stator core 91 is made of a laminate of electromagnetic steel sheets, but it may also be made of materials such as silicon steel sheets, permendur (cobalt steel), and permalloy.

[0029] The partition wall 4 is made of glass fiber reinforced plastic (GFRP) that can be formed into a non-magnetic, thin-walled cylindrical shape. Among plastics, glass fiber reinforced plastic (GFRP) has a low linear expansion coefficient. The axial length of the partition wall 4 is longer than the axial length (axial length) of the stator core 91. More specifically, the partition wall 4 is configured to have a length that protrudes axially outward beyond the axial outer end of the stator coil 92 that protrudes axially outward from the stator core 91. In addition, the partition wall 4 is fixed by an adhesive 10 over the entire area of ​​the inner surface 91A of the stator core 91. This ensures the rigidity of the partition wall 4. As shown in FIG. 2, a gap S1 is formed between the axial outer end 4A of the partition wall 4 and the inner surface 3A of the housing 3 facing it.

[0030] A pair of partition wall supports 11, 11 are provided along the partition wall 4 to support a portion of the partition wall 4 that does not overlap with the stator core 91 in the axial direction, i.e., a pair of end portions 4T, 4T protruding axially outward from both axial ends of the stator core 91. Each partition wall support 11 extends outward from the axial outer end of the stator core 91 to the axial outer end of the partition wall 4.

[0031] Each partition wall support 11 is formed separately from the partition wall 4 and is composed of a cylindrical member fixed to the radial outer surface of the partition wall 4 with an adhesive 10. By adhering the partition wall supports 11, 11 to the partition wall 4 in this manner, the partition wall 4 is mechanically supported. The partition wall support 11 is preferably formed from the same material as the stator core 91 (iron in this embodiment) or a material having a similar linear expansion coefficient. This makes the deformation amounts, which are the amount of contraction or expansion that changes due to changes in the surrounding environment and the motor temperature, equal for the stator core 91 and the partition wall support 11, and these two members deform together, so that the radial deformation amount of the partition wall 4 becomes equal over the entire area, making it less likely for cracks to occur in the partition wall 4.

[0032] Moreover, it is preferable to use a non-magnetic material that is not easily affected by electromagnetism from the stator 9 as the material of the partition wall support part 11. This reduces leakage magnetic flux compared to the case where a magnetic material is used, and therefore eddy current loss occurring in the partition wall support part 11 can be reduced. Furthermore, it is preferable to use a non-magnetic and non-conductive material as the material of the partition wall support part 11. This prevents eddy current from flowing. Therefore, no eddy current loss occurs in the partition wall support part 11 during motor operation. In addition, since insulation breakdown due to contact between the partition wall support part 11 and the stator coil 92 is unlikely to occur, the distance between the partition wall support part 11 and the coil end part (the part of the coil that protrudes axially outward from both axial ends of the stator core 91) can be reduced, and the motor 1 can be easily made smaller and lighter. Examples of non-magnetic and non-conductive materials include stainless steel, aluminum, titanium, and the like. Examples of non-magnetic and non-conductive materials include ceramic materials, and zirconia materials with a linear expansion coefficient close to that of the stator core 91 are preferable.

[0033] 2, a buffer portion 12 is interposed between a radial outer surface 11A at the axially outer end of each partition wall support portion 11 and a radial inner surface 31d of a flange portion 31D of the housing 3 that faces the radial outer surface 11A in the radial direction. The buffer portion 12 is provided to reduce the force that is generated in the partition wall 4 and the partition wall support portion 11 due to forced displacement caused by a linear expansion difference between the housing 3 and the stator core 91 due to temperature change. In order to provide the buffer portion 12, a gap S2 is formed between the radial outer surface 11A and the radial inner surface 31d.

[0034] The buffer section 12 is made of a material having a smaller elastic modulus than the housing 3 and the partition wall support section 11. Specifically, the buffer section 12 is made of a rubber O-ring having elasticity over the entire circumference in the circumferential direction with respect to the partition wall support section 11, which is highly versatile. Therefore, the buffer section 12 can not only reduce (alleviate) the force generated in the partition wall 4 and the partition wall support section 11 due to the forced displacement caused by the linear expansion difference between the housing 3 and the stator core 91, but also functions as a sealing member that seals the gap S2 between the flange section 31C or 31D and the partition wall support section 11 or 11. In addition, the buffer section 12 has a function of absorbing the change in the gap dimension generated by the linear expansion difference between the housing 3 and the stator core 91 and maintaining the airtightness. By reducing (alleviating) the force, damage (cracks) of the partition wall 4 and the partition wall support section 11 and peeling of the adhesive 10 between the partition wall 4 and the stator core 91 can be suppressed. Furthermore, ease of assembly and disassembly is improved by sealing the gap between the housing 3 (flange portion 31C or 31D) and the partition wall support portion 11 or 11 with an O-ring. Furthermore, maintenance for preventing oil leakage from the sealing portion between the housing 3 (flange portion 31C or 31D) and the partition wall support portion 11 or 11 is improved by changing or replacing the O-ring through reassembly or by installing a new oil drain port.

[0035] In addition, by disposing an O-ring as a sealing member on the radial outside of the partition wall 4, a sealing member is not required on the radial inside of the partition wall 4, and only the partition wall 4 along the axial direction is present on the radial inside of the partition wall 4. This allows the radial inside of the partition wall 4 to be in a flat state, so that even if oil leaks from the partition wall 4 to the radial inside of the partition wall 4, the oil moves along the radial inner surface of the flat partition wall 4, so that a mechanism for discharging the leaked oil to the outside of the housing 3 can be easily provided by simply forming an outlet in the housing 3, for example. In addition, by discharging the leaked oil to the outside of the housing 3, the leaked oil is less likely to accumulate in the air gap between the rotor 8 and the partition wall 4. This reduces the frictional force caused by the leaked oil when the rotor 8 rotates. Furthermore, it is possible to prevent the motor 1 from burning out due to heat generated by friction with the leaked oil when the rotor 8 rotates. Furthermore, by placing the O-ring at the radially outer end of partition 4, if housing 3 is provided with a viewing portion (not shown) radially inward from radial inner surface 31d of flange portion 31D through which the interior can be seen, the condition of the seal boundary of the O-ring pressed against flange portion 31C or 31D can be easily visually observed from the viewing portion, making it possible to quickly detect oil leakage from the seal boundary, leading to improved productivity and early detection of malfunctions.

[0036] The buffer part 12 is fitted into an annular groove 11M formed at the axially outer end of the radial outer surface of each partition support part 11 so as to be recessed radially inward, with a portion of the buffer part 12 protruding radially outward from the groove 11M. By using an O-ring having an inner diameter smaller than the inner diameter of the groove 11M as the buffer part 12, the O-ring can be set in the groove 11M in a taut state, so that the O-ring is less likely to come off the groove 11M. This prevents the O-ring from falling off during assembly.

[0037] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention.

[0038] In the above embodiment, an inner rotor type motor is used, but an outer rotor type motor may be used. In the case of an outer rotor type motor, the inner and outer radial relationship between the rotor and the stator is opposite to that in the above embodiment.

[0039] In the above embodiment, the buffer portion 12 is formed of an O-ring, which not only reduces the force generated in the partition wall 4 and the partition wall support portion 11 due to forced displacement caused by the linear expansion difference between the housing 3 and the stator core 91, but also functions as a sealing member that seals the gap S2 between the flange portion 31C or 31D and the partition wall support portion 11 or 11. However, the present invention can also be implemented by providing two separate members: a force reducing member that reduces the force generated in the partition wall 4 and the partition wall support portion 11 due to forced displacement caused by the linear expansion difference between the housing 3 and the stator core 91, and a sealing member that seals the gap S2 between the flange portion 31C or 31D and the partition wall support portion 11 or 11. When not serving as a sealing member, the force reducing member can be provided intermittently in the circumferential direction.

[0040] In the above embodiment, the groove 11M for mounting the buffer unit 12 is provided in the partition support unit 11, but the groove may be provided in the housing 3. In the case of fixing the buffer unit by a means other than the groove, for example, by pinning, etc.

[0041] In the above embodiment, the buffer section 12 is configured to absorb force in the radial direction, but the buffer section 12 may be configured to absorb force in the axial direction.

[0042] Also, in the above embodiment, the partition wall 4 and the partition wall support parts 11, 11 are configured as separate parts, but by integrally forming the partition wall 4 and the partition wall support parts 11, 11, the number of parts can be reduced. In this case, the coil end portion of the partition wall 4 is made thicker than other parts by protruding toward the outer diameter side or protruding toward the inner diameter side. This increases the rigidity of the partition wall 4 itself and enables the partition wall 4 to maintain a perfect circular shape by itself, improving assembly.

[0043] Furthermore, in the above embodiment, the partition wall support portion 11 is configured to have a cylindrical shape, but the partition wall support portion 11 may have any shape as long as it can be disposed between the partition wall 4 and the coil end portion.

[0044] In the above embodiment, the housing 3 is made of a single metal material, but the portion arranged in a positional relationship where a force due to a linear expansion difference may be generated with respect to the stator core 91, i.e., the flange portion 31C or 31D, a portion of the housing 3 including the flange portion 31C or 31D, may be made of a material having a linear expansion coefficient different from that of the material constituting the stator core 91, and the other portions of the housing 3 may be made of a material different from that material, or may be made of a synthetic resin in some cases. In addition, the stator core 91 is also made of a single metal material, but the portion arranged in a positional relationship where a force due to a linear expansion difference may be generated with respect to the housing 3, i.e., both axial ends of the stator core 91, may be made of a material having a linear expansion coefficient different from that of the material constituting the housing 3, and the other portions of the stator core 91 except for both axial ends of the stator core 91 may be made of a material different from that material.

[0045] In the above embodiment, the partition wall support 11 is made of one member. However, as shown in FIG. 3, the partition wall support 11 may be made of two members 111, 112, or any number of members, three or more. By making the partition wall support 11 out of a plurality of members in this way, the partition wall support 11 can be made of a material suitable for the required function in accordance with the relationship with other components of the motor. Specifically, each member can be made of an optimal material depending on the magnitude of the force generated in each member, so that the force can be well alleviated. More specifically, referring to FIG. 3, the partition wall support 11 includes a cylindrical support body 111 extending from the axial end of the stator core 91 to the axial outer end of the partition wall 4, and an annular buffer holding portion 112 fixed to the radial outer surface of the axial outer end of the support body 111 by adhesive and having a groove 112M in which the buffer portion 12 is inserted and held. The support body 111 and the buffer holding portion 112 may be integrated by means of, for example, fitting, other than bonding. The buffer portion 12 is an O-ring.

[0046] The support body 111 is configured in an L-shape with an L-shaped notch 111K formed at the axial outer end in a cross-sectional view where the buffer holding part 112 fits in. When the buffer holding part 112 fits into the support body 111, the radial outer surface 111A of the support body 111 and the radial outer surface 112A of the buffer holding part 112 are flush in the radial direction. Also, the axial outer end 111B of the support body 111 and the axial outer end 112B of the buffer holding part 112 are flush in the axial direction. Other parts not described are the same as those in FIG. 2, so they are denoted by the same reference numerals and description will be omitted.

[0047] Since the bulkhead support member 11 shown in FIG. 1 is close to the stator core 91 and the stator coil 92, it is difficult to use metal parts that are subject to electromagnetic influence. On the other hand, since the groove 11M (see FIG. 2) for an O-ring to be described later, which is formed in the bulkhead support member 11, needs to be processed with high precision, there is a concern that productivity will decrease and costs will increase if it is made of an integrally structured part (one member). For this reason, as shown in FIG. 3, the bulkhead support member 11 is made of two members made of different materials, namely, the support body 111 and the buffer holding part 112 having the groove 112M. Since the support body 111 is a member close to the stator core 91, it is preferable to use a non-magnetic material that is less subject to electromagnetic influence from the stator core 91 and the stator coil 92. This reduces leakage magnetic flux compared to when a magnetic material is used, and therefore eddy current loss generated in the support body 111 can be reduced. Furthermore, it is preferable that the material of the support body 111 is non-magnetic and non-conductive. This prevents eddy currents from flowing. Therefore, no eddy current loss occurs in the support body 111 when the motor is in operation. Also, since dielectric breakdown due to contact between the support body 111 and the stator coil 92 is unlikely to occur, the distance between the support body 111 and the coil end portion (the portion of the coil that protrudes axially outward from both axial ends of the stator core 91) can be reduced, making it easier to make the motor 1 smaller and lighter. Examples of non-magnetic materials include stainless steel, aluminum, and titanium. Examples of non-magnetic and non-conductive materials include ceramic materials, but zirconia materials with a linear expansion coefficient close to that of the stator core 91 may also be used.

[0048] In addition, the material of the buffer holding portion 112 may be any material that has a strength that can withstand the elastic restoring force generated when the O-ring, which is the buffer portion 12, is crushed by the pressing force from the housing 3. However, if good workability that allows the groove portion 112M to be formed accurately and strength are also required, a metal material is preferable. When using this metal material, the partition wall support portion 11 is constructed from multiple members rather than being manufactured as an integral structure, which leads to improved productivity and reduced costs. Furthermore, when the partition wall support portion 11 is constructed from multiple members, there is an advantage that the processing accuracy is improved and the accuracy of the required parts is easily obtained by partially using a metal material. In FIG. 3, the partition wall support portion 11 is constructed from two (or three or more) members in the radial direction, but it may be constructed from any number of members, such as two (or three or more) members in the axial direction. By constructing the partition wall support portion 11 from multiple members in the radial or axial direction, a material suitable for each part can be selected according to the required function. [Explanation of symbols]

[0049] 1...motor, 2...motor section, 3...housing, 3A...inner surface, 4...partition wall, 4A...axial outer end, 4T...end section, 5...rotating shaft, 6, 7...bearing, 8...rotor, 9...stator, 10...adhesive, 11...partition wall support section, 11A...radial outer surface, 11M...groove section, 12...buffer section (O-ring), 31...housing body, 31A, 31B...through hole, 31C, 31D...flange section, 31d...radial inner surface, 32, 33... Lid body, 91... stator core, 91A... inner surface, 92... stator coil, 111... support body, 112... buffer portion holder, 111A... radial outer surface, 111B... axial outer end, 111K... notch, 112... buffer portion holder, 112A... radial outer surface, 112B... axial outer end, 112M... groove, IN... inlet, K1... inlet side space, K2... outlet side space, OUT... outlet, S1, S2... gap, X... axis

Claims

1. A housing and A rotor that rotates about an axis relative to the housing; a stator fixed to the housing and generating a magnetic force for rotating the rotor, the stator having at least a portion made of a material having a linear expansion coefficient different from that of the housing; a partition wall provided between the rotor and the stator along the axial direction to define a flow path through which a cooling liquid passes within the housing; a partition wall support portion provided along the partition wall to support a portion of the partition wall that does not overlap with the stator in the axial direction; a buffer portion interposed between the housing and the partition wall support portion, the buffer portion being made of a material having a smaller elastic modulus than the housing and the partition wall support portion; A liquid-cooled motor.

2. The stator is located radially outward of the rotor, The liquid-cooled motor according to claim 1 , wherein the partition wall support portion is provided radially outward of the partition wall.

3. 2. The liquid-cooled motor according to claim 1, wherein the buffer portion is an O-ring provided around the entire periphery of the partition wall support portion.

4. The partition wall support portion is configured by combining a plurality of members, 2. The liquid-cooled motor according to claim 1, wherein at least one of the plurality of members is made of a material different from the other members.

5. The liquid-cooled motor according to claim 4 , wherein at least two of the plurality of members are combined in a radial direction.

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