JP7396869B2 - Rotating electrical machines and drive units - Google Patents

Description

The present disclosure relates to a rotating electrical machine and a drive unit.

BACKGROUND ART Conventionally, as this type of rotating electric machine, one including a stator, a rotor, and a case that accommodates the stator and rotor has been proposed (see, for example, Patent Document 1). In this rotating electrical machine, the case includes a housing that is open at one end in the axial direction, and a cover that is fixed to the housing so as to cover the one end of the housing and to which the stator is fixed. The cover has a plurality of bosses formed at intervals in the circumferential direction, into which bolts for fastening the stator are screwed.

Japanese Patent Application Publication No. 2009-101730

In a drive unit that uses such a rotating electrical machine, if the rigidity around the boss of the cover, or even the integrated stator and case, is low, the resonance frequency of the drive unit will be low, and the rotational speed of the output shaft of the drive unit will be low. Vibration and noise may become large in a region where the speed is low (for example, in a low vehicle speed region when mounted on a vehicle).

The main purpose of the disclosed invention is to increase the resonant frequency of a drive unit using a rotating electric machine.

The rotating electrical machine of the present disclosure employs the following means to achieve the above-mentioned main objective.

The rotating electrical machine of the present disclosure includes:
A rotating electric machine including a stator, a rotor, and a first case that accommodates the stator and the rotor,
The first case includes a housing that is open at one end in the axial direction, and a cover to which the stator is fixed and which is fixed to the housing so as to cover the one end of the housing,
The cover has an annular rib protruding from the inner surface toward the other end of the housing,
The annular rib has a plurality of boss portions formed at intervals in the circumferential direction, into which bolts for fastening the stator are screwed.
The gist is that.

In the rotating electric machine of the present disclosure, the first case includes a housing that is open at one end in the axial direction, and a cover to which the stator is fixed and which is fixed to the housing so as to cover one end of the housing. has an annular rib protruding from the inner surface toward the other end of the housing, and the annular rib has a plurality of boss portions formed at intervals in the circumferential direction into which bolts for fastening the stator are screwed. ing. Thereby, the rigidity around the boss portion of the cover and, by extension, the rigidity of the integrated stator and first case can be increased. Therefore, the resonant frequency of the drive unit using the rotating electric machine can be increased. As a result, it is possible to suppress vibrations and noise from increasing in a region where the rotation speed of the output shaft of the drive unit is low (for example, in a low vehicle speed region when mounted on a vehicle).

1 is a schematic configuration diagram of a hybrid vehicle 10 equipped with a rotating electric machine according to the present disclosure. FIG. 2 is a cross-sectional view of the vicinity of motor MG and clutch C1 of hybrid vehicle 10. FIG. 7 is a perspective view of a front cover 80 of the case 70. FIG.

Next, embodiments for carrying out the invention of the present disclosure will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a hybrid vehicle 10 equipped with a drive unit having a rotating electric machine according to the present disclosure. The hybrid vehicle 10 of the present disclosure includes an engine 11, a motor (rotating electric machine) MG, a clutch C1, and a power transmission device 15, as illustrated. Here, the motor MG and the power transmission device 15 correspond to the "drive unit" in the embodiment.

The engine 11 is configured as an internal combustion engine that outputs power using fuel such as gasoline or diesel oil. A crankshaft 12 of this engine 11 is connected to a first transmission shaft 14a via a damper 13. The damper 13 includes a plurality of coil springs (elastic bodies) that damp torsional vibrations.

The motor MG is configured as a well-known synchronous generator motor, and is rotationally driven by an inverter (not shown). The clutch C1 is configured as a hydraulically driven friction clutch, and connects and disconnects the first transmission shaft 14a and the motor MG.

The power transmission device 15 includes a torque converter 16 , an automatic transmission (transmission mechanism) 17 , an oil pump 18 , and a hydraulic control device 19 . The torque converter 16 is configured as a general fluid transmission device, and includes a pump impeller attached to a second transmission shaft 14b connected to the motor MG, and a turbine runner connected to the input shaft 17i of the automatic transmission 17. , a stator that rectifies the flow of hydraulic oil from the turbine runner to the pump impeller, a one-way clutch that limits the rotation direction of the stator to one direction, and a hydraulic drive that connects and disconnects the pump impeller and turbine runner. Equipped with a lock-up clutch. The torque converter 16 transmits the power of the second transmission shaft 14b to the input shaft 17i of the automatic transmission 17 by amplifying the torque, or transmits the power without amplifying the torque.

The automatic transmission 17 is configured, for example, as a 4-speed to 10-speed transmission, and includes an input shaft 17i, an output shaft 17o connected to the drive wheels DW via a differential gear DF, and a plurality of planetary gears. , and a plurality of hydraulically driven friction engagement elements (clutches, brakes). This automatic transmission 17 changes the speed of the power transmitted to the input shaft 17i in multiple stages and outputs it from the output shaft 17o. Note that instead of the automatic transmission 17, a continuously variable transmission may be used.

The oil pump 18 is attached to the pump impeller of the torque converter 16, and is driven by the power of the second transmission shaft 14b. The hydraulic control device 19 has a valve body and a plurality of valves, regulates the hydraulic pressure from the oil pump 18, and supplies it to the lock-up clutch of the torque converter 16 and the clutches and brakes of the automatic transmission 17.

FIG. 2 is a sectional view of the vicinity of motor MG and clutch C1 of hybrid vehicle 10. As shown in FIG. 2, the motor MG includes a stator 20, a rotor 30 disposed inside the stator 20 in the radial direction, and a case 70 that houses the stator 20 and the rotor 30 and has a housing 71 and a front cover 80. Be prepared.

The stator 20 includes a stator core 21 and a three-phase coil 22 wound around the stator core 21. The stator core 21 is integrally formed by laminating a plurality of electromagnetic steel plates formed into an annular shape by, for example, press processing and connecting them in the lamination direction, and is fixed to the front cover 80 of the case 70 with bolts 25.

The rotor 30 includes a rotor core 31 and a holding member 40 that holds the rotor core 31. The rotor core 31 is formed by laminating a plurality of electromagnetic steel plates formed into an annular shape by, for example, press working, and includes a plurality of through holes formed at intervals in the circumferential direction and passing through in the axial direction. A permanent magnet 31a is embedded in each. End plates 32 and 33 are arranged at both ends of the rotor core 31 in the axial direction.

The holding member 40 includes an outer member 41 and an inner member 45 welded to the outer member 41. The outer member 41 is formed by forging and cutting iron, for example, and includes a cylindrical cylindrical portion 42 and a flange extending radially outward from one end of the cylindrical portion 42 (the left end in FIG. 2). 43, and an annular wall portion 44 extending radially inward from the other end (right side in FIG. 2) of the axial center of the cylindrical portion 42. The rotor core 31 is attached to the cylindrical portion 42 together with the end plates 32 and 33 by shrink fitting as described below.

First, the rotor core 31 formed to have an inner diameter slightly smaller than the outer diameter of the cylindrical part 42 of the holding member 40 is heated, and the rotor core 31 is heated so that the inner diameter of the rotor core 31 is larger than the outer diameter of the cylindrical part 42. Inflate. Subsequently, the end plate 32, rotor core 31, and end plate 33 are arranged in this order from the flange portion 43 side so that they surround the cylindrical portion 42 and abut each other, and the end plate 32 abuts the flange portion 43. Then, when the rotor core 31 is cooled, the rotor core 31 contracts and the cylindrical portion 42 is fixed to the rotor core 31. Then, the end plate 33 is fixed to the cylindrical portion 42 by caulking the end plate 33 or the like.

The inner member 45 is formed by forging and cutting iron, for example, and includes an annular wall portion 46 and a cylindrical member extending from the inner periphery of the annular wall portion 46 to one side in the axial direction (the left side in FIG. 2). A cylindrical portion 47 , a cylindrical portion 48 extending from the radially outer side of the cylindrical portion 47 of the annular wall portion 46 to the other side in the axial direction (the right side in FIG. 2 ), and The protrusion 49 extends from the radially outer side of the cylindrical portion 48 toward one side in the axial direction and has a triangular cross section.

The outer periphery of the annular wall 46 is fixed to the inner periphery of the annular wall 44 of the outer member 41 by welding. The inner periphery of the cylindrical portion 47 is spline-fitted to the outer periphery of the second transmission shaft 14b. A bearing 90 is disposed between the outer periphery of the cylindrical portion 48 and the inner periphery of the cylindrical portion 75 of the housing 71 . Therefore, the cylindrical portion 48 is rotatably supported by the housing 71 via the bearing 90.

A connecting member 51 is fixed to the side of the flange portion 43 of the holding member 40 opposite to the rotor core 31 with bolts 50 . The connecting member 51 is made of iron, for example, and has a fixing part (bolt hole) with the flange part 43 on the outer periphery, and a plate-shaped annular wall part 52 and one side in the axial direction from the inner periphery of the annular wall part 52. It has a cylindrical cylindrical portion 53 that extends into the cylindrical portion. A bearing 91 is arranged between the outer periphery of the cylindrical part 53 and the inner periphery of the cylindrical part 85 of the front cover 80, and a bearing 91 is arranged between the inner periphery of the cylindrical part 53 and the first transmission shaft 14a. , bearings 92 are arranged. As a result, the connecting member 51 and the holding member 40 connected thereto are rotatably supported by the front cover 80 via the bearing 91, and the first transmission shaft 14a is supported relative to the connecting member 51 via the bearing 92. Rotatably supported.

As a result, a space is formed inside the cylindrical portion 42 of the holding member 40 in the radial direction, with both sides in the axial direction partitioned by the annular walls 44 and 46 of the holding member 40 and the annular wall 52 of the connecting member 51. be done.

The clutch C1 includes a clutch hub 61 connected to the first transmission shaft 14a, a holding member 40 connected to the second transmission shaft 14b and also functioning as a clutch drum, a plurality of friction plates 63, and a friction plate 63. A plurality of separator plates 64, a backing plate 65, a snap ring 66, a piston 67 that presses and frictionally engages the separator plate 64 and the friction plate 63, a plurality of return springs SP, and a plurality of return springs SP, which are alternately arranged. plate (cancellation oil chamber defining member) 68.

The clutch hub 61 includes a cylindrical cylindrical portion 61a and an annular wall portion 61b extending radially inward from one end of the cylindrical portion 61a. A spline 61s is formed on the outer peripheral surface of the cylindrical portion 61a. The inner circumference of the annular wall portion 61b is connected to the first transmission shaft 14a by welding.

A spline 42s is formed on the inner peripheral surface of the cylindrical portion 42 of the holding member 40, which also functions as a clutch drum, on the side closer to the flange portion 43 than the annular wall portion 44. The spline 42s is formed with an annular recess 42a that is recessed toward the outside in the radial direction. The annular recess 42a overlaps the end surface of the flange portion 43 on the rotor core 31 side (the right end surface in FIG. 2) in the axial direction of the rotor 30 when viewed from the radial direction of the rotor 30.

Each of the plurality of friction plates 63 is an annular member having a friction material adhered to both surfaces thereof, and the outer peripheral portion thereof is fitted into the spline 42s of the cylindrical portion 42 of the holding member 40 (clutch drum). Thereby, the plurality of friction plates 63 rotate together with the cylindrical portion 42 and are supported by the cylindrical portion 42 so as to be movable in the axial direction.

Each of the plurality of separator plates 64 is an annular member having smooth surfaces on both sides, and the inner peripheral portion thereof is fitted into the spline 61s of the clutch hub 61. Thereby, the plurality of separator plates 64 rotate together with the clutch hub 61 and are supported by the clutch hub 61 so as to be movable in the axial direction.

The backing plate 65 is an annular member, and its outer peripheral portion is fitted into the spline 42s of the cylindrical portion 42 so as to be able to come into contact with the friction plate 63 furthest from the piston 67 among the plurality of friction plates 63. The snap ring 66 is attached (fitted) to the annular recess 42 a of the cylindrical portion 42 . This snap ring 66 restricts the movement of the backing plate 65 and the like in the axial direction (movement away from the piston 67).

The piston 67 includes an annular pressure receiving part 67a, a cylindrical cylindrical part 67b extending from the outer periphery of the pressure receiving part 67a toward the clutch hub 61 in the axial direction, and a pressure receiving part 67b extending radially outward from the cylindrical part 67b. 67c.

The inner peripheral surface of the pressure receiving part 67a is supported by the outer peripheral surface of the cylindrical part 47 of the holding member 40 via a seal member so as to be freely movable in the axial direction. The outer peripheral surface of the pressure receiving part 67a is supported by the inner peripheral surface of the protruding part 49 of the holding member 40 via a seal member so as to be freely movable in the axial direction. The annular wall portion 46 and the cylindrical portions 47 and 49 of the holding member 40 and the pressure receiving portion 67a of the piston 67 define an engagement oil chamber 69a of the clutch C1. The engagement oil chamber 69a is connected to the hydraulic control device 19 via an oil passage (not shown), and the engagement oil chamber 69a contains an engagement hydraulic pressure (hydraulic oil) regulated by the hydraulic control device 19. is supplied. When the engagement oil pressure is supplied to the engagement oil chamber 69a, the piston 67 moves toward the cancel plate 68 due to the action of the engagement oil pressure, presses the separator plate 64 and the friction plate 63 with the pressing part 67c, and As a result, clutch C1 is engaged.

A plurality of recesses (grooves) into which the splines 42s of the cylindrical portion 42 of the holding member 40 are loosely fitted are formed at intervals in the circumferential direction on the outer peripheral surface of the pressing portion 67c. Thereby, the piston 67 can be prevented from rotating relative to the cylindrical portion 42, and both can be rotated together.

The cancel plate 68 is an annular member disposed on the opposite side of the annular wall portion 46 of the holding member 40 with respect to the piston 67, and its inner peripheral portion is attached to the cylindrical portion 47 of the holding member 40 using a snap ring. Fixed. The outer circumferential surface of the cancel plate 68 supports the inner circumferential surface of the tip of the cylindrical portion 67b of the piston 67 so as to be movable in the axial direction via a sealing member. The pressure receiving part 67a and the cylindrical part 67b of the piston 67, the cancel plate 68, and the cylindrical part 47 of the holding member 40 define a centrifugal hydraulic pressure cancellation chamber 69b for canceling the centrifugal hydraulic pressure generated in the engagement oil chamber. Ru. The centrifugal hydraulic pressure cancellation chamber 69b is connected to the hydraulic control device 19 via an oil path (not shown), and the centrifugal hydraulic pressure cancellation chamber 69b is supplied with hydraulic oil for lubricating and cooling drained from the hydraulic control device 19. A portion of the oil is supplied through the oil path by centrifugal force generated as the holding member 40 and the like rotate.

The plurality of return springs 69 are arranged at intervals in the circumferential direction between the pressure receiving part 67a of the piston 67 and the cancel plate 68 in the axial direction, and are attached to the side away from the friction plate 63 and the separator plate 64. to strengthen As the return spring 69, for example, a coil spring is used.

The case 70 includes a housing 71 that is open on the engine 11 side in the axial direction (the left side in FIG. 2), and a front cover 80 that is fixed to the housing 71 so as to cover one end side (opening side) of the housing 71.

The housing 71 is formed by casting an aluminum alloy or the like, and includes an annular wall portion 72, a cylindrical portion 73 extending from the outer periphery of the annular wall portion 72 toward the engine 11 in the axial direction, and a distal end of the cylindrical portion 73. an extending portion 74 that extends in this order from the outer periphery of the side in the radial direction, to the engine 11 side in the axial direction, and to the outside in the radial direction; and a cylindrical portion in the axial direction from slightly outside the inner periphery of the annular wall portion 72 in the radial direction. 73 , and a cylindrical portion 76 that extends from the outer periphery of the annular wall portion 72 toward the side away from the engine 11 in the axial direction (toward the power transmission device 15 side).

At the distal end of the cylindrical portion 73, female screw holes 73h whose distal end surfaces are open are formed at intervals in the circumferential direction. A plurality of bolt holes (through holes) 74h are formed in the extending portion 74 at intervals in the circumferential direction and passing through in the axial direction. This extending portion 74 is configured such that a plurality of bolts (not shown) are inserted into corresponding bolt holes 74h, and are inserted into corresponding female screw holes (not shown) formed in the engine block 110 (see FIG. 1) of the engine 10. By screwing together, it is fixed to the engine block 110.

As described above, the cylindrical portion 75 rotatably supports the cylindrical portion 48 of the holding member 40 via the bearing 90. A plurality of bolt holes (through holes) 76h are formed in the cylindrical portion 76 at intervals in the circumferential direction and that penetrate in the axial direction. This cylindrical portion 76 has a plurality of bolts (not shown) inserted into corresponding bolt holes 76h, and a corresponding female screw hole (not shown) formed in a transmission case 150 (see FIG. 1) of the power transmission device 15. ) is fixed to the transmission case 150.

FIG. 3 is a perspective view of the front cover 80 of the case 70. The front cover 80 is formed by casting a material having a larger coefficient of thermal expansion than the material forming the stator core 21 of the stator 20, such as an aluminum alloy. As shown in FIGS. 2 and 3, the front cover 80 includes a plate-shaped annular wall portion 81, an extending portion 82 extending radially outward from the outer periphery of the annular wall portion 81, and an annular wall portion 81. an annular rib 83 extending from the outer periphery toward the housing 71 in the axial direction (right side in FIG. 2); a plurality of (for example, eight) boss portions 84 formed on the annular rib 83 at intervals in the circumferential direction; It includes a cylindrical portion 85 extending toward the housing 71 in the axial direction from slightly outside the inner periphery of the annular wall portion 81 in the radial direction.

A plurality of bolt holes (through holes) 82h are formed in the extending portion 82 at intervals in the circumferential direction. The extending portion 82 is connected to the cylindrical portion 73 of the housing 71 by inserting a plurality of bolts 94 into the corresponding bolt holes 82h and screwing into the corresponding female screw holes 73h of the cylindrical portion 73 of the housing 71. Fixed.

On both sides in the circumferential direction of each boss portion 84 of the annular rib 83, extending portions 83a are formed that extend in the axial direction from the outer periphery of the tip portion of the annular rib 83. The inner diameter of the annular rib 83 is designed to be smaller than the outer diameter of the stator core 21, and the inner diameter of the extending portion 83a is designed to be slightly larger than the outer diameter of the stator core 21.

Further, between two adjacent boss portions 84 of the annular rib 83, each of the boss portions 84 is opened at the tip side and has a length shorter than the annular rib 83 in the axial direction (for example, about half the length of the annular rib 83). A letter-shaped notch 83b is formed. Specifically, the plurality of notches 83b are formed at equal intervals in the circumferential direction of the annular rib 83. Note that the shape of the notch 83b is not limited to the V-shape, but may be designed as appropriate.

A female screw hole 84h is formed in each of the plurality of boss portions 84. The stator core 21 has one end in the axial direction (the left side in FIG. 2) positioned by the inner periphery of the plurality of extensions 83a, a plurality of bolts 25 each inserted into a corresponding bolt hole 21h of the stator core 21, and a plurality of bolt holes 21h. It is fixed to the plurality of bosses 84 of the front cover 80 by screwing into the corresponding female screw holes 84h of the bosses 84.

The friction plate 63 and separator plate 64 of the clutch C1 are operated by hydraulic oil supplied between the clutch hub 61 and the cancel plate 68 or through an oil hole formed in the cylindrical portion 61a of the clutch hub 61. , lubrication and cooling are performed. At least a portion of this hydraulic fluid is distributed through oil holes formed in the cylindrical portion 42 of the holding member 40 and between the rotor core 31 of the rotor 30 and the cylindrical portion 42 and flange portion 43 of the holding member 40. By circulating the water, the rotor 30 is cooled. Furthermore, the stator 30 is cooled by supplying at least a portion of this hydraulic oil to the coil ends 22 and the like of the stator 20.

In this embodiment, the front cover 80 of the case 70 includes an annular rib 83 and a plurality of boss portions 84 formed on the annular rib 83 at intervals in the circumferential direction. The stator core 21 is assembled to the plurality of bosses of the front cover 80 by inserting the plurality of bolts 25 into the corresponding bolt holes 21h of the stator core 21 and screwing them into the corresponding female threaded holes 84h of the plurality of bosses 84. 84. By providing the annular rib 83 in this manner, the rigidity around the plurality of boss portions 84 of the front cover 80 and, by extension, the rigidity of the integrated stator 20 and case 70 (housing 71 and case 80) can be increased. . Therefore, the resonance frequency of the drive unit including the motor MG and the power transmission device 15 can be increased. As a result, it is possible to suppress vibrations and noise from increasing in a region where the rotational speed of the output shaft 17o is low (low vehicle speed region).

Further, in the embodiment, the front cover 80 of the case 70 is formed of a material having a larger coefficient of thermal expansion than the material forming the stator core 21 of the stator 20, and the front cover 80 of the case 70 is made of a material having a larger coefficient of thermal expansion than the material forming the stator core 21 of the stator 20. A notch 83b is formed between each boss portion 84 and opens at the tip side. As a result, the rigidity of the front cover 80 around the boss portion 84 is lower than that of a case where the notch 83b is not formed, so that when the front cover 80 thermally expands due to heat generated by the motor MG, etc., the front cover 80 is not deformed. It becomes easy to be held down by the bolt 25. Moreover, by forming the plurality of notches 83b in a V-shape, it is possible to more easily absorb thermal expansion of the front cover 80 by the plurality of notches 83b while ensuring a certain degree of rigidity of the front cover 80.

Thereby, loosening of the plurality of bolts 25 with respect to the corresponding female threaded holes 84h of the plurality of boss portions 84 can be suppressed. Moreover, the hydraulic oil in the case 70 (the hydraulic oil supplied to the clutch C1, the motor MG, etc.) can be circulated through the notch 83b in the lower part of the front cover 80. In addition, by forming the plurality of notches 83b at equal intervals in the circumferential direction of the annular rib 83, vibration and noise of the drive unit are reduced, and loosening of the plurality of bolts 25 in the plurality of female screw holes 84h is suppressed. It is possible to appropriately achieve both.

Furthermore, in the embodiment, a plurality of extension parts 83a are formed extending in the axial direction from the outer periphery of the tip of the annular rib 83 of the front cover 80. By using the plurality of extending portions 83a for positioning the stator core 21, the stator 20 can be easily fastened to the stator core 21.

In the embodiment, notches 83b are formed between two adjacent boss portions 84 of the annular rib 83 of the front cover 80, respectively. That is, the number of boss portions 84 and the number of notches 83b were made to be the same. However, the number of notches 83b may be smaller than the number of bosses 84. Even in this case, it is preferable that the plurality of notches 83b be formed at equal intervals in the circumferential direction of the annular rib 83. For example, when there are six bosses 84, three notches 83b are formed every 120 degrees, and when there are eight bosses 84, four notches 83b are formed every 90 degrees. It can also be used as a thing. Further, the annular rib 83 may not have the cutout 83b.

In the embodiment, the front cover 80 has a plurality of extensions 83a, but may not have such a plurality of extensions 83a.

As described above, the rotating electrical machine of the present disclosure is a rotating electrical machine (MG) that includes a stator (20), a rotor (30), and a first case (70) that accommodates the stator (20) and the rotor. The first case (70) includes a housing (71) which is open at one end in the axial direction, and a housing (71) to which the stator (20) is fixed and which covers the one end of the housing (71). a cover (80) fixed to the housing (71); the cover (80) has an annular rib (83) protruding from an inner surface toward the other end of the housing (71); The gist is that the annular rib (83) is formed with a plurality of boss portions (84) at intervals in the circumferential direction, into which bolts (25) for fastening the stator (20) are screwed. do.

In the rotating electric machine of the present disclosure, the first case includes a housing that is open at one end in the axial direction, and a cover to which the stator is fixed and which is fixed to the housing so as to cover one end of the housing. has an annular rib protruding from the inner surface toward the other end of the housing, and the annular rib has a plurality of boss portions formed at intervals in the circumferential direction into which bolts for fastening the stator are screwed. ing. Thereby, the rigidity around the boss portion of the cover and, by extension, the rigidity of the integrated stator and first case can be increased. Therefore, the resonant frequency of the drive unit using the rotating electric machine can be increased. As a result, it is possible to suppress vibrations and noise from increasing in a region where the rotation speed of the output shaft of the drive unit is low (for example, in a low vehicle speed region when mounted on a vehicle).

In the rotating electric machine of the present disclosure, a plurality of notches (83b) are formed at equal intervals in the circumferential direction between two adjacent boss portions (84) of the annular rib (83). It can also be used as a thing. In this way, it is possible to prevent the bolts for fastening the stator and the cover from loosening with respect to the boss portion. Moreover, the hydraulic oil (cooling medium) supplied to the rotating electric machine can be circulated through the cutout in the lower part of the first case.

In this case, the plurality of cutouts may be formed in a V-shape. In this way, the plurality of notches can more easily absorb thermal expansion of the cover while ensuring a certain degree of rigidity of the cover.

Further, in this case, the cover (80) may be made of a material having a larger coefficient of thermal expansion than the material forming the stator (20). Since the cover is more susceptible to thermal expansion than the stator, it is of greater significance to provide multiple notches in the annular rib to prevent the bolts used to connect the stator and cover from loosening relative to the boss. .

In the rotating electrical machine of the present disclosure, a positioning portion (83a) for the stator (20) may be formed at the tip of the annular rib (83). In this way, the stator and the cover can be more easily connected.

The drive unit of the present disclosure includes a power transmission device (15) that transmits power of a transmission shaft (14b) connected to the rotating electric machine (MG) to an output shaft (17o), and the first case (70) , is fixed to the second case (150) of the power transmission device (15). Since the drive unit of the present disclosure includes the rotating electric machine of the present disclosure in any of the above-described aspects, it is possible to achieve the same effects as the rotating electric machine of the present disclosure.

Although the embodiments for carrying out the present disclosure have been described above, the present disclosure is not limited to these embodiments in any way, and may be implemented in various forms without departing from the gist of the present disclosure. Of course.

The present disclosure can be used in the manufacturing industry of rotating electric machines and drive units having the same.

10 hybrid vehicle, 11 engine, 12 crankshaft, 13 damper, 14a first transmission shaft, 14b second transmission shaft, 15 power transmission device, 16 torque converter, 17 automatic transmission, 17i input shaft, 17o output shaft, 18 oil Pump, 19 Hydraulic control device, 20 Stator, 21 Stator core, 21h Bolt hole, 22 Three-phase coil, 25, 50, 94 Bolt, 30 Rotor, 31 Rotor core, 31a Permanent magnet, 32, 33 End plate, 40 Holding member, 41 Outer member, 42, 47, 48, 53, 61a, 73, 75, 85 Cylindrical portion, 42a Annular recess, 42s, 61s Spline, 43 Flange portion, 44, 46, 52, 61b, 72, 81 Annular wall portion, 45 inner member, 49 protruding portion, 51 connecting member, 61 clutch hub, 63 friction plate, 64 separator plate, 65 backing plate, 66 snap ring, 67 piston, 67a pressure receiving portion, 67c pressing portion, 68 cancel plate, 69 return spring , 69a engaging oil chamber, 69b centrifugal hydraulic canceling chamber, 70 case, 71 housing, 73h, 84h female screw hole, 74, 82, 83a extension, 74h, 82h bolt hole, 80 front cover, 83 annular rib, 83b notch , 84 boss section, 90, 91, 92 bearing, 110 engine block, 150 transmission case, C1 clutch.

Claims (5)

A rotating electric machine including a stator, a rotor, and a first case that accommodates the stator and the rotor,
The first case includes a housing that is open at one end in the axial direction, and a cover to which the stator is fixed and which is fixed to the housing so as to cover the one end of the housing,
The cover has an annular rib protruding from the inner surface toward the other end of the housing,
A plurality of boss portions into which bolts for fastening the stator are screwed are formed on the annular rib at intervals in the circumferential direction ,
A plurality of notches are formed at equal intervals in the circumferential direction between two adjacent boss portions of the annular rib,
The notch is open at the other end of the housing and has a length in the axial direction that is shorter than the annular rib.
Rotating electric machine. The rotating electrical machine according to claim 1 ,
The plurality of cutouts are formed in a V-shape,
Rotating electric machine. The rotating electric machine according to claim 1 or 2 ,
The cover is formed of a material having a larger coefficient of thermal expansion than the material forming the stator.
Rotating electric machine. A rotating electrical machine according to any one of claims 1 to 3 ,
A positioning portion for the stator is formed at the tip of the annular rib.
Rotating electric machine. A drive unit comprising the rotating electric machine according to any one of claims 1 to 4 ,
comprising a power transmission device that transmits power of a transmission shaft connected to the rotating electric machine to an output shaft,
the first case is fixed to a second case of the power transmission device;
drive unit.

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