Rotating electric machine

Abstract

A drive device according to one embodiment of the present invention is provided with: a rotor having a shaft extending along a central axis; a stator facing the rotor with a gap therebetween; a housing that accommodates the rotor and the stator; and a resolver having a resolver rotor fixed to the shaft and a resolver stator located radially outward of the resolver rotor. The housing has a side wall portion located on one side of the rotor in the axial direction. The side wall portion has a cylindrical portion that holds the resolver stator on the inner side. The cylindrical portion has: a first inner peripheral surface surrounding the outer peripheral surface of the resolver stator; a first surface that is connected to an end portion on the other side in the axial direction of the first inner peripheral surface and faces the other side in the axial direction; a second surface that is continuous with an end portion on one side in the axial direction of the first inner peripheral surface and faces the other side in the axial direction; and one or more caulking parts provided on the first surface. The more than one chiseling part comprises an anti-falling part which protrudes towards the radial inner side relative to the outer peripheral surface of the rotary transformer stator, and the anti-falling part is in contact with the end surface of the other axial side of the rotary transformer stator.

Description

Technical Field

[0001] The present invention relates to rotating electrical machines.

[0002] This application claims priority based on Japanese Patent Application No. 2022-096742 filed in Japan on June 15, 2022, the contents of which are cited here. Background Art

[0003] The development of rotating electrical machines installed in electric vehicles and hybrid vehicles is actively underway. Such rotating electrical machines are equipped with resolvers as angle sensors for measuring the rotation angle of a rotor. Patent document 1 discloses a resolver stator fixed to a housing via a fastening member.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2013-092400 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In the conventional fixing method of the rotary transformer, the fixing of the rotary transformer stator uses a fastening component, so the number of components increases. In addition, when the conventional fixing method of the rotary transformer is adopted, there is a problem that the installation space of the fastening component needs to be ensured in the housing, and the rotary electric machine becomes larger.

[0009] The present invention has been made in view of the above circumstances, and one object of the present invention is to provide a rotating electrical machine capable of simplifying the fixing structure of a resolver.

[0010] Means for solving problems

[0011] A driving device according to one embodiment of the present invention comprises: a rotor having a shaft extending along a central axis; a stator facing the rotor with a gap therebetween; a housing accommodating the rotor and the stator; and a rotary transformer having a rotary transformer rotor fixed to the shaft and a rotary transformer stator located radially outward of the rotary transformer rotor. The housing comprises a side wall portion located on one axial side of the rotor. The side wall portion comprises a cylindrical portion that holds the rotary transformer stator on the inner side. The cylindrical portion comprises: a first inner peripheral surface that surrounds the outer peripheral surface of the rotary transformer stator; a first surface that is connected to the end portion on the other axial side of the first inner peripheral surface and faces the other axial side; a second surface that is connected to the end portion on the one axial side of the first inner peripheral surface and faces the other axial side; and one or more caulking portions that are provided on the first surface. The one or more caulking portions comprise at least one anti-slipping portion that protrudes radially inwardly relative to the outer peripheral surface of the rotary transformer stator, and the anti-slipping portion contacts the end surface on the other axial side of the rotary transformer stator.

[0012] Effects of the Invention

[0013] According to one aspect of the present invention, it is possible to provide a rotating electrical machine capable of simplifying the fixing structure of a resolver. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a driving device of one embodiment.

[0015] Figure 2 is a cross-sectional view of a housing, a bearing, and a rotary transformer stator according to one embodiment.

[0016] Figure 3 1 is a top view of a housing, a bearing, and a rotary transformer stator according to one embodiment.

[0017] Figure 4 It is along Figure 3 A partial cross-sectional view of the cylindrical portion of line IV-IV and the rotary transformer stator.

[0018] Figure 5 It is along Figure 3 A partial cross-sectional view of the cylindrical portion of the VV line and the resolver stator. DETAILED DESCRIPTION

[0019] Hereinafter, a driving device according to an embodiment of the present invention will be described with reference to the drawings.

[0020] In the following description, the vertical direction is specified and described according to the positional relationship when the drive device of the embodiment shown in each figure is mounted on a vehicle located on a horizontal road surface. In addition, in the accompanying drawings, the XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The +Z side is the upper side in the vertical direction, and the -Z side is the lower side in the vertical direction. In the following description, the upper side in the vertical direction is referred to as the "upper side", and the lower side in the vertical direction is referred to as the "lower side". The X-axis direction is a direction perpendicular to the Z-axis direction, and is the front-to-back direction of the vehicle equipped with the drive device. In the following embodiments, the +X side is the front side of the vehicle, and the -X side is the rear side of the vehicle. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and is the left-right direction of the vehicle, that is, the vehicle width direction. In the following embodiments, the +Y side is the left side of the vehicle, and the -Y side is the right side of the vehicle. The front-to-back direction and the left-to-right direction are horizontal directions perpendicular to the vertical direction.

[0021] The central axis J shown appropriately in each figure extends in the Y-axis direction, that is, the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the central axis J is simply referred to as the "axial direction", the radial direction centered on the central axis J is simply referred to as the "radial direction", and the circumferential direction centered on the central axis J, that is, the direction around the central axis J is simply referred to as the "circumferential direction". In addition, in the following description, the -Y side in the axial direction along the central axis J is sometimes simply referred to as the axial one side, and the +Y side is simply referred to as the axial other side.

[0022] Figure 1 It is a schematic diagram of a driving device 1 according to one embodiment.

[0023] The drive device 1 is mounted on a vehicle such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an electric vehicle (EV) that uses a motor as a power source, and is used as a power source for these vehicles. The drive device 1 includes a housing 1a, a rotating electric machine 2, a power transmission mechanism 3, a cooler 9, and a pump 8.

[0024] (case)

[0025] The housing 1a includes a housing 81 for housing the internal structure of the rotating electric machine 2 and a gear housing 82 for housing the power transmission mechanism 3. The gear housing 82 is located on the other axial side (+Y side) of the housing 81. In the present embodiment, the housing 81 is a part of the rotating electric machine 2. The housing 81 will be described in detail later together with the rotating electric machine 2.

[0026] The housing 1a has a partition wall portion 83. The partition wall portion 83 divides the internal space of the housing 81 and the internal space of the gear storage portion 82. The partition wall portion 83 constitutes a part of the housing 81 and the gear storage portion 82. The partition wall portion 83 is provided with a shaft through hole 83a and a partition wall opening 83b. The shaft through hole 83a and the partition wall opening 83b allow the internal spaces of the housing 81 and the gear storage portion 82 to communicate with each other. The shaft 21 is inserted through the shaft through hole 83a.

[0027] The housing 1a contains a fluid O. The fluid O circulates in a flow path 90 described later. In the present embodiment, the fluid O is oil, which is used not only to cool the rotary electric machine 2 but also to lubricate the power transmission mechanism 3. As the fluid O, in order to exert the functions of lubricating oil and cooling oil, it is preferable to use an oil equivalent to an automatic transmission lubricating oil (ATF: Automatic Transmission Fluid) having a relatively low viscosity.

[0028] A fluid reservoir P for accumulating fluid O is provided in the lower region inside the gear housing 82. The fluid O accumulated in the fluid reservoir P is lifted by the action of the power transmission mechanism 3 and diffused into the gear housing 82. The fluid O diffused into the gear housing 82 is supplied to each gear of the power transmission mechanism 3 in the gear housing 82, and the fluid O is spread over the tooth surfaces of the gears. The fluid O supplied to the power transmission mechanism 3 and used for lubrication drips and is recovered to the fluid reservoir P in the gear housing 82.

[0029] The flow path 90 is a flow path for conveying the fluid O in the fluid reservoir P to the inside of the housing 81. The flow path 90 includes a first flow path 91, a second flow path 92, a third flow path 93, a fourth flow path 94, and a fifth flow path 95. In addition, the flow path 90 is provided with a tube 94P.

[0030] The first flow path 91 is a flow path connecting the fluid storage portion P and the pump 8. The pump 8 sucks up the fluid O in the fluid storage portion P and presses it to the downstream side. The second flow path 92 is a flow path connecting the pump 8 and the cooler 9. The fluid O is cooled by the cooler 9. The third flow path 93 is a flow path connecting the cooler 9 and the internal space of the housing 81. The third flow path 93 is a flow path passing through the interior of the partition wall portion 83. A pipe 94P is connected to the end on the downstream side of the third flow path 93.

[0031] The fourth flow path 94 is a flow path that diffuses the fluid O to the inside of the housing 81. The fourth flow path 94 is provided inside the tube 94P. The tube 94P is arranged in the internal space of the housing 81 and on the upper side of the stator 30. The tube 94P extends axially in the internal space of the housing 81. A plurality of discharge holes are provided in the tube 94P. The fluid O passing through the fourth flow path 94 is discharged from the discharge holes. A portion of the fluid O discharged from the discharge holes is provided to the rotating electric machine 2 to cool the rotating electric machine 2. In addition, a portion of the fluid O discharged from the discharge holes is provided to the bearing 7 through the fifth flow path 95. The fifth flow path 95 is a flow path that guides the fluid discharged to the inside of the housing 81 through the fourth flow path 94 to the bearing 7. The fifth flow path 95 will be described in detail later.

[0032] (Power transmission mechanism)

[0033] The power transmission mechanism 3 includes a plurality of gears 41, 42, 43, and 51. The power transmission mechanism 3 transmits the power of the rotary electric machine 2. The power transmission mechanism 3 includes a reduction gear 4 and a differential gear 5.

[0034] The reduction gear 4 has a function of reducing the rotation speed of the rotary electric machine 2 and increasing the torque output from the rotary electric machine 2 according to the reduction ratio. The reduction gear 4 is connected to the shaft 21. The reduction gear 4 transmits the torque output from the rotary electric machine 2 to the differential device 5.

[0035] The reduction gear 4 includes a first gear 41, an intermediate shaft 45, and a second gear 42 and a third gear 43 fixed to the intermediate shaft 45. The torque output from the rotary electric machine 2 is transmitted to the ring gear 51 of the differential device 5 via the shaft 21, the first gear 41, the second gear 42, and the third gear 43. The gear ratio of each gear and the number of gears can be variously changed according to the required reduction ratio.

[0036] The first gear 41 is fixed to the outer peripheral surface of the shaft 21. The first gear 41 rotates together with the shaft 21 about the center axis J1. The intermediate shaft 45 extends along the intermediate axis J2 parallel to the center axis J1. The intermediate shaft 45 rotates about the intermediate axis J2. The second gear 42 and the third gear 43 are arranged in an axial direction. The second gear 42 and the third gear 43 rotate about the intermediate axis J2. The second gear 42 meshes with the first gear 41. The third gear 43 meshes with the ring gear 51 of the differential device 5.

[0037] The differential device 5 is a device for transmitting the torque output from the rotating electric machine 2 to the wheels of the vehicle. The differential device 5 has a function of transmitting the same torque to a pair of output shafts 55 while absorbing the speed difference between the left and right wheels when the vehicle turns. The differential device 5 includes a ring gear 51. The ring gear 51 rotates around a differential axis J3 parallel to the center axis J1. The torque output from the rotating electric machine 2 is transmitted to the ring gear 51 via the reduction gear 4.

[0038] (motor)

[0039] In the present embodiment, the rotating electrical machine 2 is an inner rotor type motor. In addition, the rotating electrical machine 2 of the present embodiment is, for example, a three-phase AC motor. The rotating electrical machine 2 has both the function of a motor and the function of a generator. The rotating electrical machine 2 has a rotor 20, a stator 30, a bearing 7, a rotary transformer 60, and a housing 81.

[0040] The rotor 20 is rotatable about a central axis J1 extending in the horizontal direction. The torque of the rotor 20 is transmitted to the power transmission mechanism 3. The rotor 20 includes a shaft 21, a rotor core 24, and a rotor magnet (not shown) fixed to the rotor core. The rotor core 24 is fixed to the outer peripheral surface of the shaft 21.

[0041] The shaft 21 extends along the central axis J1. The shaft 21 rotates around the central axis J1. The shaft 21 is connected to the rotor 20 inside the housing 81. In addition, the shaft 21 is connected to the power transmission mechanism 3 inside the gear housing 82.

[0042] The stator 30 surrounds the rotor 20 from the radially outer side. The stator 30 and the rotor 20 are opposed to each other with a gap therebetween. The stator 30 has a stator core 32 and a coil 31. The stator 30 is held in the housing 1a. The stator core 32 has a plurality of magnetic pole teeth (not shown) from the inner circumference of the annular yoke to the radially inner side. Coil wires are arranged between the magnetic pole teeth. The coil wires located in the gaps between adjacent magnetic pole teeth constitute the coil 31.

[0043] The bearing 7 is located on one axial side (-Y side) of the rotor core 24. The bearing 7 supports the shaft 21 on one axial side (-Y side) of the rotary transformer 60. In addition, the bearing 7 may also support the shaft 21 on the other axial side (+Y side) of the rotary transformer 60. The bearing 7 supports the shaft 21 so that it can rotate. The bearing 7 is held by the housing 81. In addition, although not shown in the figure, the rotary electric machine 2 has other bearings that support the shaft 21 on the other axial side (+Y side) of the rotor core 24 in addition to the bearing 7.

[0044] The resolver 60 measures the rotation angle of the rotor 20. The resolver 60 includes a resolver rotor 69 and a resolver stator 61. The resolver rotor 69 is annular centered on the central axis J1. The resolver rotor 69 is fixed to the outer peripheral surface of the shaft 21. The resolver rotor 69 rotates around the central axis J1 together with the shaft 21.

[0045] The resolver stator 61 is located radially outside the resolver rotor 69. The resolver stator 61 and the resolver rotor 69 are radially opposed to each other. The resolver stator 61 is fixed to the housing 81.

[0046] Figure 2 It is a cross-sectional view of the bearing 7 and the resolver stator 61 held by the housing 81 in the present embodiment. Figure 3 8 is a top view of the bearing 7 and the rotary transformer stator 61 held in the housing 81 in this embodiment. Figure 3 In FIG. 1 , the coil 63 of the resolver stator 61 is omitted from illustration.

[0047] like Figure 2 As shown, the rotary transformer stator 61 has a core portion 62 and a plurality of coils 63. The core portion 62 has: a core back, which is in a circular ring shape with the central axis J1 as the center; and a plurality of teeth, which extend radially inward from the core back and are arranged circumferentially. The coil 63 is mounted on the teeth of the core portion 62 via an insulating member not shown. The plurality of coils 63 are arranged circumferentially. The current excited by the rotation of the rotary transformer rotor 69 flows in the coil 63. The rotary transformer 60 measures the rotation angle of the rotor 20 based on the current value flowing in the coil 63.

[0048] In addition, if Figure 3 As shown, resolver stator 61 has connector 68. Connector 68 is connected to a power line for supplying power to resolver stator 61. Connector 68 is also connected to a signal line for outputting the measurement result of the rotation angle of rotor 20 by resolver 60 to the outside.

[0049] A plurality of (six in this embodiment) grooves 65 and 66 are provided on the outer peripheral surface 62b of the core portion 62. That is, the grooves 65 and 66 are provided on the outer peripheral surface of the resolver stator 61. The plurality of grooves 65 and 66 include one second groove 66 and five third grooves 65.

[0050] The second groove 66 is semicircular when viewed from the axial direction. The second groove 66 is radially opposed to the first groove 76 described later and is used to position the rotary transformer stator 61. The third groove 65 is rectangular when viewed from the axial direction. The third groove 65 is used to stop the rotary transformer stator 61.

[0051] In addition, the second groove portion 66 and the third groove portion 65 may also have the same shape. In addition, other groove portions other than the second groove portion 66 and the third groove portion 65 may be provided on the outer peripheral surface 62b of the resolver stator 61. In addition, the plurality of groove portions 65 and 66 provided on the outer peripheral surface of the resolver stator 61 may also be arranged at equal intervals along the circumferential direction.

[0052] like Figure 1 As shown, the housing 81 accommodates the rotor 20 and the stator 30. The housing 81 includes a peripheral wall portion 81a, a partition wall portion 83, and a side wall portion 70. In the housing 81 of the present embodiment, the peripheral wall portion 81a and the partition wall portion 83 are formed by a single component. On the other hand, the side wall portion 70 is a separate component from the peripheral wall portion 81a, and the side wall portion 70 is fixed to the peripheral wall portion 81a from one axial side (-Y side).

[0053] The peripheral wall portion 81a is cylindrical with the central axis J1 as the center. The peripheral wall portion 81a surrounds the rotor 20 and the stator 30 from the radially outer side. The partition wall portion 83 is located on the other axial side (+Y side) of the rotor 20 and the stator 30. The side wall portion 70 is located on one axial side (-Y side) of the rotor 20 and the stator 30. The partition wall portion 83 and the side wall portion 70 extend along a plane perpendicular to the central axis J1.

[0054] like Figure 3 As shown, the side wall portion 70 has a side wall portion body 71, a cylindrical portion 72, a closed portion 73 and a plurality of ribs 79. The side wall portion body 71 is in the shape of a plate extending along a plane perpendicular to the central axis J1. The cylindrical portion 72 and the ribs 79 protrude from the surface of the side wall portion 70 facing the other axial side (+Y side) toward the other axial side (+Y side). The cylindrical portion 72 extends axially with the central axis J1 as the center. The ribs 79 extend radially outward from the outer peripheral surface of the cylindrical portion 72. A plurality of ribs 79 are arranged circumferentially with the central axis J1 as the center. The ribs 79 reinforce the cylindrical portion 72. In addition, the ribs 79 guide the fluid O to the opening of the inlet flow path 72h described later.

[0055] The cylindrical portion 72 is open on the other axial side (+Y side). In addition, the cylindrical portion 72 is closed on one axial side (-Y side) by the closing portion 73. That is, the closing portion 73 closes the cylindrical portion 72 from one axial side (-Y side). The cylindrical portion 72 holds the bearing 7 and the resolver stator 61 on the inside.

[0056] like Figure 2 As shown, the cylindrical portion 72 has a first inner peripheral surface 72b, an intermediate inner peripheral surface 72d and a second inner peripheral surface 72f facing radially inward, and a first surface 72a, a second surface 72c, a third surface 72e and a fourth surface 72g facing the other axial side (+Y side).

[0057] The first inner circumferential surface 72b, the intermediate inner circumferential surface 72d, and the second inner circumferential surface 72f are cylindrical surfaces centered on the central axis J1. The first inner circumferential surface 72b, the intermediate inner circumferential surface 72d, and the second inner circumferential surface 72f are arranged in sequence from the other axial side (+Y side) toward the one axial side (-Y side). The diameters of the first inner circumferential surface 72b, the intermediate inner circumferential surface 72d, and the second inner circumferential surface 72f are successively reduced. In addition, the first surface 72a, the second surface 72c, the third surface 72e, and the fourth surface 72g are arranged in sequence from the other axial side (+Y side) toward the one axial side (-Y side).

[0058] The first surface 72a is the front end surface of the cylindrical portion 72. The first surface 72a extends radially outward from the end of the first inner peripheral surface 72b on the other axial side (+Y side). That is, the first surface 72a is connected to the end of the first inner peripheral surface 72b on the other axial side (+Y side).

[0059] The second surface 72c connects the end of the first inner peripheral surface 72b on one axial side (-Y side) and the end of the intermediate inner peripheral surface 72d on the other axial side (+Y side). The second surface 72c is connected to the end of the first inner peripheral surface 72b on the other axial side (-Y side).

[0060] The third surface 72e connects the end portion on one axial side (-Y side) of the intermediate inner peripheral surface 72d and the end portion on the other axial side (+Y side) of the second inner peripheral surface 72f.

[0061] The fourth surface 72g is a surface facing the other axial side (+Y side) of the closing portion 73. The fourth surface 72g extends radially inward from an end portion of the second inner peripheral surface 72f on one axial side (-Y side).

[0062] The rotary transformer stator 61 and the bearing 7 are arranged on the radial inner side of the cylindrical portion 72. The first inner peripheral surface 72b surrounds the outer peripheral surface 62b of the rotary transformer stator 61. The second surface 72c is in contact with the surface of the rotary transformer stator 61 facing the axial side (-Y side). The second inner peripheral surface 72f is located closer to the axial side (-Y side) than the second surface 72c. The second inner peripheral surface 72f surrounds the bearing 7. The outer peripheral surface of the bearing 7 is pressed into the second inner peripheral surface 72f. The fourth surface 72g is opposite to the surface of the bearing 7 facing the axial side (-Y side).

[0063] A first groove portion 76 is provided on the first inner peripheral surface 72b of the cylindrical portion 72. The first groove portion 76 extends from the first surface 72a to one side (-Y side) in the axial direction. The first groove portion 76 is semicircular when viewed from the axial direction. The first groove portion 76 is opposite to the second groove portion 66 provided on the outer peripheral surface of the rotary transformer stator 61. When viewed from the axial direction, the first groove portion 76 and the second groove portion 66 constitute the positioning hole portion 6. The positioning hole portion 6 is circular when viewed from the axial direction.

[0064] In the assembly process of the rotary transformer stator 61, the positioning hole portion 6 is used to position the rotary transformer stator 61 relative to the circumferential direction of the cylindrical portion 72. In the assembly process of the rotary transformer stator 61, first, the rotary transformer stator 61 is inserted into the inside of the cylindrical portion 72. Next, a positioning pin (not shown) is inserted into the positioning hole portion 6. As a result, the rotation of the rotary transformer stator 61 relative to the cylindrical portion 72 is restricted. Next, the rotary transformer stator 61 is fixed to the cylindrical portion 72. The fixing of the rotary transformer stator 61 to the cylindrical portion 72 is performed by forming a caulking portion 75 described later. Next, the positioning pin is removed from the positioning hole portion 6. According to the rotary electric machine 2 of the present embodiment, the positioning hole portion 6 is formed by the first groove portion 76 of the cylindrical portion 72 and the second groove portion 66 of the rotary transformer stator 61, so by inserting the positioning pin into the positioning hole portion 6, the rotary transformer stator 61 can be easily positioned.

[0065] The cylindrical portion 72 is provided with an introduction flow path 72h that penetrates in the radial direction. The introduction flow path 72h constitutes a part of the fifth flow path 95. That is, the housing 81 is provided with a fifth flow path (flow path) 90 for the fluid O to flow. The fifth flow path 95 has the introduction flow path 72h that penetrates in the radial direction of the cylindrical portion 72. That is, the fifth flow path 95 opens inside the cylindrical portion 72.

[0066] like Figure 1 As shown, the fifth flow path 95 is a flow path that guides the fluid discharged into the housing 81 through the fourth flow path 94 to the bearing 7. The radially outer opening of the inlet flow path 72h faces upward. Figure 3 As shown, the radially outer opening of the introduction flow path 72h is arranged between the two ribs 79. The fluid O discharged from the tube 94P is guided by the ribs 79 and flows into the radially outer opening of the introduction flow path 72h.

[0067] like Figure 2 As shown in the figure, the radially inner opening of the introduction flow path 72h is located at the boundary between the second inner peripheral surface 72f and the fourth surface 72g. A groove portion 72k connected to the introduction flow path 72h is provided on the second inner peripheral surface 72f and the fourth surface 72g. By providing the groove portion 72k on the second inner peripheral surface 72f and the fourth surface 72g, it is possible to prevent the opening of the introduction flow path 72h from being closed by the outer peripheral surface of the bearing 7. The fluid O that flows into the inner side of the cylindrical portion 72 via the introduction flow path 72h is guided to the inside of the cylindrical portion 72 through the inside of the groove portion 72k.

[0068] According to the present embodiment, the fluid O is guided into the inside of the cylindrical portion 72, so that the fluid O lubricates the bearing 7 and cools the resolver stator 61. This improves the rotation efficiency of the bearing 7, suppresses the resolver stator 61 from becoming hot, and stabilizes the measurement accuracy of the resolver 60.

[0069] Generally speaking, the material constituting the side wall portion 70 is required to have characteristics such as high rigidity, light weight, and easy processing. On the other hand, the material constituting the resolver stator 61 is mainly required to have high magnetic properties. That is, the material constituting the side wall portion 70 and the material constituting the resolver stator 61 are required to have different characteristics. As an example, an aluminum alloy is used as the material constituting the side wall portion 70, and an iron alloy is used as the material constituting the resolver stator 61.

[0070] Generally speaking, the side wall portion 70 and the resolver stator 61 are made of different materials, and therefore have different thermal expansion coefficients. Therefore, due to the increase in temperature, a gap may be generated between the cylindrical portion 72 and the resolver stator 61, causing the resolver stator 61 to shake. According to this embodiment, the cylindrical portion 72 and the resolver stator 61 are cooled by the fluid O, and the situation where they become hot is suppressed. As a result, the thermal expansion of the cylindrical portion 72 and the resolver stator 61 is suppressed, and the cylindrical portion 72 can stably maintain the resolver stator 61.

[0071] The side wall portion 70 of the present embodiment has a closing portion 73 that closes the cylindrical portion 72 from one axial side (-Y side). Therefore, the fluid O guided into the interior of the cylindrical portion 72 can be suppressed from flowing out from the one axial side (-Y side) of the cylindrical portion 72 to the outside, and the fluid O can be effectively supplied to the bearing 7, the rotary transformer stator 61, and the inner peripheral surface of the cylindrical portion 72.

[0072] In addition, in the present embodiment, the case where the closing portion 73 and the cylindrical portion 72 are composed of a single component is described. However, the closing portion 73 and the cylindrical portion 72 may also be separate components. As an example, the closing portion 73 may also be a cover-shaped component that covers the opening on one axial side (-Y side) of the cylindrical portion 72 via a sealing component.

[0073] like Figure 3 As shown, the cylindrical portion 72 has a plurality of (10 in this embodiment) caulking portions 75. The plurality of caulking portions 75 are provided on the first surface 72a of the cylindrical portion 72. The caulking portions 75 are arranged along the radially inner end of the first surface 72a. The caulking portions 75 are formed by applying pressure to the radially inner end of the first surface 72a using a caulking jig to plastically deform the first surface 72a.

[0074] The plurality of caulking portions 75 include an anti-slipping portion 75D and rotation-stopping portions 75A, 75B, and 75C. In the present embodiment, six of the ten caulking portions 75 are rotation-stopping portions 75A, 75B, and 75C, and four are anti-slipping portions 75D. In the present embodiment, all of these caulking portions 75 protrude radially inward relative to the outer peripheral surface 62b of the rotary transformer stator 61, and at least contact the end surface 62a on the other axial side of the rotary transformer stator 61. However, the caulking portion 75 contacting the end surface 62a of the rotary transformer stator 61 may be only the anti-slipping portion 75D.

[0075] Figure 4 It is along Figure 3 FIG. 1 is a partial cross-sectional view of the cylindrical portion 72 and the resolver stator 61 along line IV-IV.

[0076] The anti-slip portion 75D includes a recessed portion 75a that is recessed toward one axial side (-Y side) relative to the first surface 72a and a protruding portion 75b that protrudes toward the radial inner side relative to the first inner peripheral surface 72b. The recessed portion 75a is formed by plastically deforming the first surface 72a toward one axial side (-Y side) during the process of forming the anti-slip portion 75D. In addition, the protruding portion 75b is formed by displacing a portion of the plastically deformed cylindrical portion 72 toward the radial inner side during the process of forming the recessed portion 75a.

[0077] The anti-slip portion 75D protrudes radially inward relative to the outer peripheral surface 62b of the rotary transformer stator 61 at the protrusion 75b. In addition, the anti-slip portion 75D contacts the end face 62a on the other axial side (+Y side) of the rotary transformer stator 61 at the protrusion 75b. Therefore, the anti-slip portion 75D can limit the movement of the rotary transformer stator 61 to the other axial side (+Y side) at the protrusion 75b, thereby preventing the rotary transformer stator 61 from detaching from the cylindrical portion 72. In addition, the cylindrical portion 72 clamps the rotary transformer stator 61 axially between the protrusion 75b of the anti-slip portion 75D and the second surface 72c. Thus, the cylindrical portion 72 can stably hold the rotary transformer stator 61 in the axial direction.

[0078] Furthermore, by forming the retaining portion 75D, the inner side surface of the cylindrical portion 72 around the retaining portion 75D bulges radially inward and closely contacts the outer peripheral surface 62b of the resolver stator 61 around the retaining portion 75D. Therefore, the cylindrical portion 72 can stably hold the resolver stator 61 in the radial direction.

[0079] The anti-detachment portion 75D is arranged at a position different from the third groove portion 65 in the circumferential direction. Therefore, the circumferential position of the anti-detachment portion 75D does not overlap with the circumferential position of the third groove portion 65 in the radial direction. The anti-detachment portion 75D contacts the end surface 62a of the resolver stator 61 over the entire circumferential region of the protrusion 75b protruding radially inward. The anti-detachment portion 75D can more firmly suppress the resolver stator 61 from detaching from the cylindrical portion 72.

[0080] In addition, the cylindrical portion 72 of the present embodiment is provided with the anti-slip portion 75D and the anti-rotation portions 75A, 75B, and 75C as the caulking portion 75, but only the anti-slip portion 75D may be provided on the cylindrical portion 72. In addition, the cylindrical portion 72 of the present embodiment is provided with a plurality of anti-slip portions 75D, but only one anti-slip portion 75D may be provided. That is, as long as the cylindrical portion 72 has at least one caulking portion 75 provided on the first surface 72a, the at least one caulking portion 75 may include at least one anti-slip portion 75D.

[0081] like Figure 3 As shown in FIG. 1 , the rotation-stopping portions 75A, 75B, and 75C overlap with the third groove portion 65 in the radial direction. That is, the circumferential positions of the rotation-stopping portions 75A, 75B, and 75C overlap with the circumferential position of the third groove portion 65 .

[0082] Figure 5 It is along Figure 3 FIG. 1 is a partial cross-sectional view of the cylindrical portion 72 of the VV line and the resolver stator 61 . Figure 5 The figure shows the first rotation stopper 75A and the third groove 65 facing the first rotation stopper 75A among the plurality of rotation stoppers 75A, 75B, and 75C. However, the other rotation stoppers 75B and 75C also have the same cross-sectional shape at the portion facing the third groove 65.

[0083] The rotation-stopping portion 75A includes a recessed portion 75a that is recessed toward one axial side (-Y side) relative to the first surface 72a, and a rotation-stopping protrusion 75c that protrudes toward the radial inside relative to the first inner peripheral surface 72b. The recessed portion 75a is formed by plastically deforming the first surface 72a toward one axial side (-Y side) during the process of forming the rotation-stopping portion 75A. In addition, the rotation-stopping protrusion 75c is formed by displacing a portion of the tubular portion 72 that has been plastically deformed toward the radial inside during the process of forming the recessed portion 75a.

[0084] The anti-rotation protrusion 75c is arranged inside the third groove 65. That is, a part of the anti-rotation portion 75A is arranged inside the third groove 65. According to the present embodiment, a part of the anti-rotation portion 75A is circumferentially opposed to the inner side surface of the third groove 65 facing the circumferential direction. Thus, the anti-rotation portion 75A suppresses the rotation of the resolver stator 61 around the central axis J1.

[0085] In this embodiment, a gap G is provided between the anti-rotation portion 75A and the inner surface of the third groove portion 65. That is, the third groove portion 65 is not completely buried by the anti-rotation protrusion 75c of the anti-rotation portion 75A. Therefore, the fluid O flowing into the interior of the cylindrical portion 72 can flow out to the outside of the cylindrical portion 72 via the third groove portion 65, and the fluid O can be prevented from being retained in the interior of the cylindrical portion 72 and causing an increase in the sliding loss of the bearing.

[0086] like Figure 3 As shown, the six rotation stoppers 75A, 75B, and 75C are classified into two first rotation stoppers 75A, two second rotation stoppers 75B, and two third rotation stoppers 75C. The circumferential position of the first rotation stopper 75A overlaps with the entire circumferential position of the third groove 65. The circumferential position of the second rotation stopper 75B overlaps with the end of one circumferential side (+θ) of the circumferential position of the third groove 65. The circumferential position of the third rotation stopper 75C overlaps with the end of the other circumferential side (-θ) of the circumferential position of the third groove 65.

[0087] In addition, in this specification, the counterclockwise direction around the central axis J1 is defined as one circumferential side (+θ), and the clockwise direction is defined as the other circumferential side (-θ), based on the observation from the other axial side (+Y side). Figure 3 In the figure, one side in the circumferential direction (+θ) is the direction indicated by the arrow in the circumferential direction θ, and the other side in the circumferential direction (-θ) is the direction on the opposite side.

[0088] The rotation-stopping parts 75A, 75B, and 75C of this embodiment overlap with at least one end portion (+θ) or the other end portion (−θ) of the third groove portion 65 in the circumferential direction. The rotation-stopping parts 75A, 75B, and 75C are arranged at the circumferential end portions of the third groove portion 65, so that a part of the rotation-stopping parts 75A, 75B, and 75C (the rotation-stopping protrusion 75c (see Figure 5 )) contacts the surface of the third groove portion 65 facing the circumferential direction.

[0089] The first rotation stopper 75A of the present embodiment is provided so as to cover the entire circumferential area of ​​the third groove 65. The first rotation stopper 75A overlaps the entire circumferential length of the third groove 65 in the radial direction. Therefore, the first rotation stopper 75A overlaps the end portions of one circumferential side (+θ) and the other circumferential side (-θ) of the third groove 65. A portion of the first rotation stopper 75A (the rotation stopper protrusion 75c (see Figure 5 )) contacts the inner side surface of the third groove 65 facing one circumferential side (+θ) and the inner side surface facing the other circumferential side (-θ) of the third groove 65. Thus, the first anti-rotation portion 75A can stably hold the resolver stator 61 in any circumferential direction.

[0090] The second rotation-stopping portion 75B of the present embodiment overlaps with the end portion on one circumferential side (+θ) of the third groove portion 65. A portion of the second rotation-stopping portion 75B (the rotation-stopping protrusion 75c (see Figure 5 )) is in contact with the inner side surface of the third groove portion 65 facing the other circumferential side (-θ) of the third groove portion 65. On the other hand, the third anti-rotation portion 75C of this embodiment overlaps with the end portion of the third groove portion 65 on the other circumferential side (-θ). A portion of the third anti-rotation portion 75C (anti-rotation protrusion 75c (refer to Figure 5 )) is in contact with the inner side surface of the third groove portion 65 facing the circumferential side (+θ) inside the third groove portion 65. The cylindrical portion 72 of this embodiment can stably hold the resolver stator 61 in any circumferential direction by the combination of the second rotation stop portion 75B and the third rotation stop portion 75C.

[0091] In addition, although the anti-rotation function of the anti-rotation parts 75A, 75B, and 75C is described here, the anti-rotation parts 75A, 75B, and 75C of this embodiment also have the same anti-slip function as the anti-slip part 75D. That is, the anti-rotation parts 75A, 75B, and 75C of this embodiment are also anti-slip parts. The anti-rotation parts 75A, 75B, and 75C constitute the same anti-slip part as the third groove part 65 in the portion arranged in the circumferential direction. Figure 4 The anti-detachment portion 75D shown has the same cross-sectional shape and contacts the end surface of the resolver stator 61 at the protrusion 75b to prevent the resolver stator 61 from detaching from the cylindrical portion 72. The anti-rotation portions 75A, 75B, and 75C may not have an anti-detachment function.

[0092] like Figure 3 As shown, when the cylindrical portion 72 is observed from the axial direction, the ten caulking portions 75 are classified into five groups of caulking portions 75, each of which is composed of two caulking portions 75 arranged across the central axis J1. That is, the cylindrical portion 72 has a plurality of caulking portions 75, each of which is composed of two caulking portions 75. In addition, when the two caulking portions 75 in the same group are observed from the axial direction, they are located on opposite sides across the central axis J1. The two caulking portions 75 in one group can stably hold the rotary transformer stator 61 around the central axis J1, and can suppress the rotary transformer stator 61 from tilting or deforming even if an external force is applied to the rotary transformer stator 61.

[0093] Here, when viewed from the axial direction, the two caulking portions 75 are located on opposite sides across the central axis J1, which means that the two caulking portions 75 are arranged on a common straight line passing through the central axis J1. In addition, the straight line passing through the central axis J1 may not necessarily pass through the circumferential centers of the two caulking portions. However, in the present embodiment, the straight line passing through the central axis J1 passes through the circumferential centers of the two caulking portions 75 of the same group, so that the rotary transformer stator 61 can be held more stably.

[0094] In addition, in the present embodiment, the two caulking portions 75 of the same group arranged on opposite sides across the central axis J1 are the same type of caulking portions 75. That is, the anti-slip portion 75D is arranged on the opposite side of the anti-slip portion 75D across the central axis J1, the first anti-rotation portion 75A is arranged on the opposite side of the first anti-rotation portion 75A, the second anti-rotation portion 75B is arranged on the opposite side of the second anti-rotation portion 75B, and the third anti-rotation portion 75C is arranged on the opposite side of the third anti-rotation portion 75C. According to the present embodiment, the plurality of types of caulking portions 75 can be made to hold the resolver stator 61 more stably in the circumferential direction.

[0095] Here, if Figure 3 As shown, when the cylindrical portion 72 is observed from the axial direction, an imaginary line L2 passing through the center of the positioning hole portion 6 and the central axis J1 is assumed. In addition, when observed from the axial direction, one of the two areas divided by the imaginary line L2 is set as the first area A1, and the other side is set as the second area A2. According to this embodiment, the number of the caulking portions 75 located in the first area A1 and the number of the caulking portions 75 located in the second area A2 are both 5, which is the same number.

[0096] According to the present embodiment, the caulking portion 75 can be evenly arranged with respect to the imaginary line L2 passing through the positioning hole portion 6 and the center axis J1. Therefore, the caulking portion 75 is formed in a state where the resolver stator 61 is positioned by the positioning hole portion 6, and the resolver stator 61 is fixed, thereby being able to support the resolver stator 61 more stably in the circumferential direction.

[0097] When viewed from the axial direction, the center line L1 of the inlet flow path 72h extends in the radial direction. When viewed from the axial direction, the center line L1 of the inlet flow path 72h of the present embodiment is arranged at a position different from the caulking portion 75 in the circumferential direction. According to the present embodiment, by providing the caulking portion 75 away from the center of the inlet flow path 72h having low rigidity, it is possible to suppress the inlet flow path 72h from being flattened when the caulking portion 75 is formed.

[0098] In the present embodiment, at least one of the caulking portions 75 overlaps with the rib 79 in the radial direction. In the process of forming the caulking portion 75, a large force is applied to the first surface 72a of the cylindrical portion 72 on one axial side (-Y side) by a caulking jig. According to the present embodiment, the cylindrical portion 72 is reinforced on the radial outer side of the caulking portion 75 by the rib 79 overlapping in the radial direction, and the unexpected deformation of the cylindrical portion 72 can be suppressed. As a result, the reduction in the roundness of the inner diameter of the cylindrical portion 72 caused by the forming process of the caulking portion 75 can be suppressed, and the cylindrical portion 72 can be stably held on the rotary transformer stator 61.

[0099] The side wall portion 70 is provided with a window portion 71w extending in the axial direction and a window frame portion 71d surrounding the window portion 71w when viewed from the axial direction. The window portion 71w overlaps with the connector portion 68 of the resolver stator 61 when viewed from the axial direction. A power line and a signal line connected to the connector portion 68 are passed through the window portion 71w.

[0100] The window frame portion 71d protrudes from the surface of the side wall portion 70 that faces the axial one side (-Y side) toward the axial one side (-Y side). Therefore, in the side wall portion 70 of the present embodiment, the cylindrical portion 72 and the window frame portion 71d are respectively provided on the surfaces that face the opposite sides to each other. The front end surface of the window frame portion 71d on the axial one side (-Y side) is a flat surface that is perpendicular to the central axis J1. A cover member (not shown) is mounted on the front end surface of the window frame portion 71d.

[0101] like Figure 3 As shown, when the cylindrical portion 72 is viewed from the axial direction, the window frame portion 71d overlaps with at least one caulking portion 75. Therefore, in the process of forming the caulking portion 75, the force applied to the first surface 72a of the cylindrical portion 72 by the caulking jig can be stably received by the window frame portion 71d, and the caulking portion 75 can be smoothly formed.

[0102] According to the present embodiment, the cylindrical portion 72 holds not only the resolver stator 61 but also the bearing 7. Figure 2 As shown, the cylindrical portion 72 has a second inner peripheral surface 72f surrounding the bearing 7 from the radially outer side. According to the present embodiment, by arranging the resolver 60 between the bearing 7 and the rotor core 24, the measurement accuracy of the resolver 60 can be improved.

[0103] In addition, the cylindrical portion 72 of this embodiment needs sufficient rigidity to support the bearing 7, and the radial thickness is sufficiently ensured. Therefore, in the process of forming the caulking portion 75 on the cylindrical portion 72, even if a large force is applied to the cylindrical portion 72, unexpected deformation of the cylindrical portion 72 can be suppressed.

[0104] According to the present embodiment, the rotary transformer 60 is arranged at a position closer to one axial side (-Y side) than the bearing 7. Therefore, the caulking portion 75 for fixing the rotary transformer stator 61 can be arranged at the end of the other axial side (+Y side) of the cylindrical portion 72. In addition, the cylindrical portion 72 has a portion for holding the bearing 7 on one axial side (-Y side) of the caulking portion 75, and the portion of the cylindrical portion 72 on one axial side relative to the caulking portion 75 can be increased. Therefore, when the caulking portion 75 is formed, even if a force is applied to the cylindrical portion 72 on one axial side (-Y side), the unintentional deformation of the cylindrical portion 72 can be suppressed.

[0105] Furthermore, according to the present embodiment, the resolver 60 is disposed on the opening side (the other axial side) of the cylindrical portion 72 with respect to the bearing 7 and fixed to the cylindrical portion 72 . Therefore, it is possible to suppress the bearing 7 from coming off the cylindrical portion 72 .

[0106] The various embodiments and modifications of the present invention have been described above, but each structure and combination thereof in each embodiment and modification is an example, and addition, omission, substitution and other changes of the structure can be made without departing from the scope of the present invention. In addition, the present invention is not limited by the embodiment.

[0107] In addition, the present technology can adopt the following structures.

[0108] (1) A rotary electric machine comprising: a rotor having a shaft extending along a central axis; a stator opposed to the rotor with a gap therebetween; a housing accommodating the rotor and the stator; and a rotary transformer having a rotary transformer rotor fixed to the shaft and a rotary transformer stator located radially outward of the rotary transformer rotor, the housing having a side wall portion located on one axial side of the rotor, the side wall portion having a cylindrical portion holding the rotary transformer stator on the inner side, the cylindrical portion having: a first inner peripheral surface surrounding the outer peripheral surface of the rotary transformer stator; a first surface connected to an end portion on the other axial side of the first inner peripheral surface and facing the other axial side; a second surface connected to an end portion on one axial side of the first inner peripheral surface and facing the other axial side; and one or more caulking portions provided on the first surface, the one or more caulking portions including at least one anti-slipping portion protruding radially inwardly relative to the outer peripheral surface of the rotary transformer stator, the anti-slipping portion contacting the end surface on the other axial side of the rotary transformer stator.

[0109] (2) A rotating electrical machine according to (1), further comprising a bearing that supports the shaft on one axial side of the rotating transformer, wherein the cylindrical portion comprises a second inner circumferential surface that is located on the axial side of the second surface, and the second inner circumferential surface surrounds the bearing from the radial outside.

[0110] (3) The rotating electrical machine according to (2), wherein the housing is provided with a flow path through which a fluid flows, and the flow path opens inside the cylindrical portion.

[0111] (4) The rotating electrical machine according to (3), wherein the side wall portion has a closing portion that closes the cylindrical portion from one axial side.

[0112] (5) A rotating electrical machine according to (3) or (4), wherein the flow path has an inlet flow path that radially penetrates the cylindrical portion, and when viewed from the axial direction, a center line of the inlet flow path is arranged at a position different from the caulking portion in the circumferential direction.

[0113] (6) A rotating electrical machine according to any one of (1) to (5), wherein the tubular portion has a plurality of the caulking portions, with two of the caulking portions forming a group, and when viewed from the axial direction, two of the caulking portions in the same group are located on opposite sides of the center axis.

[0114] (7) A rotating electrical machine according to any one of (1) to (6), wherein a first groove portion is provided on the first inner peripheral surface, and a second groove portion is provided on the outer peripheral surface of the rotating transformer stator and is radially opposite to the first groove portion, and when viewed from the axial direction, the first groove portion and the second groove portion constitute a positioning hole portion, and when viewed from the axial direction, an imaginary line is assumed to pass through the center of the positioning hole portion and the center axis. When viewed from the axial direction, the number of the clamping portions located on one side of the two areas divided by the imaginary line is the same as the number of the clamping portions located on the other side.

[0115] (8) A rotating electrical machine according to any one of (1) to (7), wherein a third groove portion is provided on the outer peripheral surface of the rotating transformer stator, the plurality of fastening portions include a rotation-stopping portion radially overlapping with the third groove portion, and a portion of the rotation-stopping portion is arranged inside the third groove portion.

[0116] (9) The rotating electrical machine according to (8), wherein the rotation-stopping portion overlaps with at least one or the other end portion of the third groove portion in the circumferential direction.

[0117] (10) The rotating electrical machine according to (8), wherein the rotation-stopping portion overlaps the entire circumferential length of the third groove portion in the radial direction.

[0118] (11) The rotating electrical machine according to (8), wherein the anti-separation portion is arranged at a position different from that of the third groove portion in the circumferential direction.

[0119] (12) A rotating electrical machine according to any one of (8) to (10), wherein a flow path for fluid flow is provided in the housing, the flow path opens inside the cylindrical portion, and a gap is provided between the stop portion and the inner surface of the third groove portion.

[0120] (13) The rotating electrical machine according to any one of (1) to (12), wherein the side wall portion has a rib extending radially outward from the outer peripheral surface of the cylindrical portion, and at least one of the caulking portions overlaps with the rib in the radial direction.

[0121] (14) A rotating electric machine according to any one of (1) to (13), wherein the side wall portion is provided with: a window portion which penetrates in the axial direction; and a window frame portion which protrudes from a surface of the side wall portion facing the axial side and surrounds the window portion when viewed in the axial direction, and the window frame portion overlaps with at least one of the fastening portions when viewed in the axial direction.

[0122] Description of symbols

[0123] 2: Rotating motor; 6: Positioning hole; 7: Bearing; 20: Rotor; 21: Shaft; 30: Stator; 60: Rotary transformer; 61: Rotary transformer stator; 62a: End surface; 62b: Outer peripheral surface; 65: Third groove; 66: Second groove; 69: Rotary transformer rotor; 70: Side wall; 71d: Window frame; 71w: Window; 72: Cylindrical portion; 72a: First surface; 72b: First inner surface Circumferential surface; 72c: the second surface; 72f: the second inner circumferential surface; 72h: the inlet flow path; 73: the closing portion; 75: the tightening portion; 75A, 75B, 75C: the rotation stop portion; 75D: the anti-slip portion; 76: the first groove portion; 79: the rib; 81: the outer shell; 90: the fifth flow path (flow path); 90: the flow path; G: the gap; J1: the center axis; L1: the center line; L2: the imaginary line; O: the fluid; θ: the circumferential direction.

Claims

1. A rotating electrical machine, comprising: a rotor having a shaft extending along a central axis; a stator, which is opposed to the rotor with a gap therebetween; a housing that accommodates the rotor and the stator; and a rotary transformer having a rotary transformer rotor fixed to the shaft and a rotary transformer stator located radially outside the rotary transformer rotor, The housing has a side wall portion located on one axial side of the rotor. The side wall portion has a cylindrical portion that holds the resolver stator inside. The cylindrical portion has: a first inner peripheral surface surrounding the outer peripheral surface of the rotary transformer stator; a first surface connected to the end of the first inner peripheral surface on the other axial side and facing the other axial side; a second surface connected to an end portion of one axial side of the first inner peripheral surface and facing the other axial side; and One or more caulking parts are provided on the first surface, The one or more caulking portions include at least one anti-slip portion that protrudes radially inward relative to the outer peripheral surface of the resolver stator, and the anti-slip portion contacts the end surface on the other axial side of the resolver stator.

2. The rotating electrical machine according to claim 1, wherein: The rotary electric machine further comprises a bearing, which supports the shaft on one axial side of the rotary transformer. The cylindrical portion includes a second inner peripheral surface located axially on one side relative to the second surface, and the second inner peripheral surface surrounds the bearing from the radially outer side.

3. The rotating electrical machine according to claim 2, wherein: The housing is provided with a flow path for fluid flow. The flow path opens inside the cylindrical portion.

4. The rotating electrical machine according to claim 3, wherein: The side wall portion has a closing portion that closes the cylindrical portion from one axial side.

5. The rotating electrical machine according to claim 3, wherein: The flow path has an introduction flow path that penetrates the cylindrical portion in a radial direction. When viewed from the axial direction, the center line of the introduction flow path is arranged at a position different from that of the caulked portion in the circumferential direction.

6. The rotating electrical machine according to claim 1, wherein: The cylindrical portion has a plurality of the caulking portions, with two of the caulking portions forming a group. When viewed in the axial direction, the two caulking portions in the same group are located on opposite sides across the central axis.

7. The rotating electrical machine according to claim 1, wherein: A first groove is provided on the first inner peripheral surface. A second groove portion is provided on the outer peripheral surface of the rotary transformer stator and is radially opposed to the first groove portion. When viewed from the axial direction, the first groove portion and the second groove portion constitute a positioning hole portion. When viewed from the axial direction, an imaginary line passing through the center of the positioning hole portion and the central axis is assumed, When viewed in the axial direction, the number of the caulked portions located on one side of the two regions divided by the imaginary line is the same as the number of the caulked portions located on the other side.

8. The rotating electrical machine according to claim 1, wherein: A third groove is provided on the outer peripheral surface of the rotary transformer stator. The plurality of caulking portions include a rotation-stopping portion that overlaps with the third groove portion in the radial direction. A portion of the rotation-stopping portion is disposed inside the third groove portion.

9. The rotating electrical machine according to claim 8, wherein: The rotation-stopping portion overlaps with at least one or the other end portion of the third groove portion in the circumferential direction.

10. The rotating electrical machine according to claim 8, wherein: The rotation-stopping portion overlaps the entire circumferential length of the third groove portion in the radial direction.

11. The rotating electric machine according to claim 8, wherein: The anti-separation portion is arranged at a position different from that of the third groove portion in the circumferential direction.

12. The rotating electrical machine according to claim 8, wherein: The housing is provided with a flow path for fluid flow. The flow path opens inside the cylindrical portion, A gap is provided between the rotation-stopping portion and the inner surface of the third groove portion.

13. The rotating electric machine according to claim 1, wherein: The side wall portion has a rib extending radially outward from the outer peripheral surface of the cylindrical portion. At least one of the braced portions overlaps the rib in the radial direction.

14. The rotating electric machine according to claim 1, wherein: The side wall portion is provided with: a window portion extending in the axial direction; and a window frame portion, which protrudes from the surface of the side wall portion facing the axial side to the axial side and surrounds the window portion when viewed from the axial direction, When viewed from the axial direction, the window frame portion overlaps with at least one of the caulked portions.

Images