JP2012029530A - Driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving device capable of suppressing strength deterioration of an axis body, while transferring a driving force of a rotary electric machine to a driving gear efficiently from a rotor.SOLUTION: The driving device which includes a rotary electric machine MG provided with a rotor 21 and a stator 22, a driving gear 34 which rotates integrally with the rotor 21, and an axis body 41 arranged on the same axis X1 as these, comprises: a first support part 42 that supports the rotor 21 from an axis first direction L1 side in an axial direction L; and a second support part 43 that supports the driving gear 34 from an axis second direction L2 side in the axial direction L, while a direction from the driving gear 34 to the rotor 21 in the axial direction L is set as the axis first direction L1, and a direction from the rotor 21 to the driving gear 34 in the axial direction L is set as the axis second direction L2. The rotor 21 and the driving gear 34 are sandwiched from both sides in axis direction by the first support part 42 and the second support part 43, and are abutted so as to press each other in the axial direction L.

Description

  The present invention relates to a rotating electrical machine having a rotor and a stator, a drive gear that is coaxially arranged with the rotor and rotates integrally with the rotor, and passes through the rotor and the drive gear to be coaxial with them. It is related with the drive device provided with the shaft object arranged.

  As the drive device as described above, for example, a device described in Patent Document 1 below is already known. In the drive device of Patent Document 1, the rotor and the drive gear (reference numeral 91 in Patent Document 1) are individually supported in the axial direction with respect to the shaft body. That is, the rotor is supported in the axial direction by nuts and flanges fixed to the shaft body on both sides in the axial direction of the rotor, and the drive gear is fixed to the shaft body on both sides in the axial direction of the drive gear. It is supported in the axial direction by the axial step of the body.

  In the apparatus of Patent Document 1, since the driving force of the rotating electrical machine is transmitted from the rotor to the driving gear via the shaft body, it is necessary to ensure the strength of the shaft body at a position where the driving force is transmitted. For this reason, the diameter of a shaft body becomes large and a rotary electric machine also enlarges. Alternatively, there are restrictions on the formation of oil passages in the shaft body, selection of materials, and the like.

By the way, in the apparatus of patent document 1, since the opposite side to the drive gear of the rotor is supported by the flange of the shaft body, after inserting the rotor into the shaft body, the nut for supporting the rotor and the drive gear are inserted in this order. Need to be assembled. For this reason, when a support portion such as a nut or an axial step is provided between the rotor and the drive gear in the axial direction, the outer diameter of the shaft body at the position where the drive gear is disposed is reduced. . That is, in order to insert the nut for supporting the rotor, it is necessary to reduce the outer diameter of the shaft body on the drive gear side from the position where the nut is disposed to be equal to or smaller than the inner diameter of the nut. Also, in order to form an axial step that supports the rotor side of the drive gear, it is necessary to retract the outer diameter of the shaft body radially inward so that it is smaller than the inner diameter of the rotor support nut. The drive gear is arranged at the position of the shaft body having a small diameter due to the step in the direction. Therefore, the outer diameter of the shaft body at the position where the drive gear is disposed is smaller than the outer diameter of the shaft body at the position where the rotor is disposed, and the strength for transmitting the driving force is reduced by the amount of the support portion disposed. Resulting in.
On the other hand, in order to improve the strength of the shaft body at the position where the drive gear is disposed, if the outer diameter of the shaft body at the position where the drive gear is disposed is increased, the shaft body at the position where the rotor is disposed more than that. Since the outer diameter of the shaft becomes larger, the diameter of the shaft body becomes larger and the rotating electrical machine becomes larger.

JP-A-9-182375

  Therefore, the problem to be solved by the invention is that the driving force of the rotating electrical machine can be efficiently transmitted from the rotor to the driving gear, and a support portion for supporting the rotor and the driving gear is provided, so that the outside of the shaft body is provided. An object of the present invention is to provide a driving device that can suppress a decrease in diameter and a decrease in strength of a shaft body.

  In order to achieve the above object, according to the present invention, there is provided a rotary electric machine including a rotor and a stator, a drive gear arranged coaxially with the rotor and rotating integrally with the rotor, the rotor and the drive gear. And a shaft body that is arranged coaxially therewith, the characteristic configuration of the drive device is such that the direction from the drive gear to the rotor in the axial direction is the first axis direction, and the rotor is in the axial direction. A first support portion that is fixed to the shaft body on the first shaft direction side with respect to the rotor and that supports the rotor in the shaft direction from the first shaft direction side, with a direction toward the drive gear as a second shaft direction. And a second support portion fixed to the shaft body on the second shaft direction side with respect to the drive gear, and supporting the drive gear in the axial direction from the second shaft direction side, and the rotor, The drive gear is connected to the first support portion and the front Sandwiched from both axial sides by the second supporting portion, so as to press each other in the axial direction lies in abutting.

  According to said characteristic structure, the frictional force which acts on the contact surface between a rotor and a drive gear in the circumferential direction in proportion to pressing force can be produced. Alternatively, the contact surface can be formed with irregularities and engaged by meshing. Therefore, the driving force of the rotating electrical machine can be directly transmitted from the rotor to the driving gear through friction of the contact surface, meshing engagement, and the like. The driving force of the rotating electrical machine transmitted from the rotor to the driving gear via the shaft can be reduced by the amount transmitted through the contact surface. Accordingly, the strength required for the shaft body is reduced, and the outer diameter of the shaft body can be reduced to reduce the size of the shaft body and the rotating electrical machine, or to reduce the weight of the shaft body. Furthermore, restrictions such as formation of an oil passage in the shaft body and selection of the material can be reduced.

  Further, according to the above characteristic configuration, the rotor and the drive gear are collectively held between the first support portion and the second support portion from both sides in the axial direction and supported in the axial direction. There is no need to support the rotor and the drive gear separately in the axial direction by providing a new support portion such as a nut or an axial step, which is different from the first support portion and the second support portion, between the directions. Therefore, since a new support portion is provided, it is not necessary to form a retraction portion such as a thread groove or an axial step on the outer peripheral surface of the shaft body. In particular, since the driving force of the rotating electrical machine transmits the shaft body between the rotor and the drive gear in the axial direction, it is necessary to ensure the strength of the shaft body between the axial directions. Therefore, even between the axial directions, the diameter of the outer peripheral surface of the shaft body can be maintained to be the same without decreasing, and a decrease in the strength of the shaft body for transmitting the driving force can be suppressed.

  In addition, since the rotor and the drive gear are collectively held by the first support portion and the second support portion from both sides in the axial direction and supported in the axial direction, the number of parts for supporting them can be reduced. .

  Here, the rotor includes an end plate having an annular plate-like portion that contacts an end surface of the rotor core on the second axial direction side, and at least one of the drive gear and the end plate includes a tooth portion of the drive gear. A spacer portion that separates the annular plate-like portion of the end plate in the axial direction is integrally provided, and the axial length of the spacer portion is the second axial direction of the annular plate-like portion of the end plate. It is preferable that the length is longer than the axial length from the side end surface to the axial second direction side end surface of the coil end portion of the stator.

  According to this configuration, the tooth portion of the drive gear is disposed so as to be positioned on the second axial direction side with respect to the coil end portion. Therefore, the driving force transmission member to the outside, such as a gear and a chain connected to the tooth portion of the driving gear, can be disposed on the second axial direction side with respect to the coil end portion, and the coil end portion can be arranged in the axial direction. It can be arranged avoiding.

  Here, the spacer portion includes a cylindrical main body portion disposed radially outside the shaft body, a connection portion between the main body portion and the annular plate-like portion of the end plate, the main body portion, and the main body portion. It is preferable that the drive gear has a load transmission portion that is provided in at least one of the connection portions with the tooth portion and is expanded in the radial direction with respect to the main body portion.

According to this configuration, the contact surface between the rotor and the drive gear can be enlarged in the radial direction by the load transmitting portion. Further, the axial force transmitting the main body portion can be dispersed in the radial direction by the load transmitting portion. Therefore, the load per unit area of the contact surface can be reduced. Accordingly, it is possible to increase the pressing force of the contact surface while suppressing the deformation of the contact surface.
Further, the expansion of the contact surface can increase the frictional force acting in the circumferential direction of the contact surface. Accordingly, it is possible to increase the driving force of the rotating electrical machine that can be directly transmitted from the rotor to the driving gear via the contact surface, and to further increase the driving force of the rotating electrical machine that is transmitted from the rotor to the driving gear via the shaft body. Can be reduced. Therefore, the strength required for the shaft body is further reduced, the outer diameter of the shaft body can be reduced, and the rotating electrical machine can be further reduced in size, and the shaft body can be further reduced in weight.

  Here, the drive portion or the end plate has a smaller one of the diameter of the root circle of the tooth portion of the drive gear and the outer diameter of the annular plate-like portion of the end plate. It is preferable that the configuration is formed integrally with the.

  According to this configuration, the smaller one of the diameter of the root circle of the tooth portion of the drive gear and the outer diameter of the annular plate-like portion of the end plate is integrated with the spacer portion, so that the larger diameter is obtained. In addition, a contact surface between the spacer portion and the drive gear or the end plate can be formed. Therefore, the contact surface between the rotor and the drive gear can be maximized. Accordingly, the pressing force of the contact surface can be further increased, and the driving force of the rotating electrical machine that can be directly transmitted from the rotor to the drive gear via the contact surface can be further increased.

  Here, it is preferable that the spacer portion is formed integrally with the drive gear.

  According to this configuration, the axial length of the inner peripheral surface of the drive gear can be increased by the axial length of the spacer portion, and the axial length of the inner peripheral surface of the drive gear is ensured to be large. be able to. Therefore, the contact surface between the outer peripheral surface of the shaft body and the inner peripheral surface of the drive gear can be lengthened in the axial direction, the inclination of the shaft center of the drive gear can be suppressed, and the driving force of the rotating electrical machine can be reduced. Transmission from the shaft body to the drive gear can be ensured.

  Here, the shaft body includes an outer peripheral surface in contact with an inner peripheral surface of the rotor and an inner peripheral surface of the drive gear, and a diameter of the outer peripheral surface of the shaft body is a region in contact with the inner peripheral surface of the rotor; It is preferable that the region is in contact with the inner peripheral surface of the drive gear.

  According to this structure, the diameter of the outer peripheral surface of the shaft body can be made the same over the region where the rotor and the drive gear are arranged, which is a region where the shaft body transmits the driving force of the rotating electrical machine. It becomes easy to maintain the strength of the shaft for transmitting the force.

  Here, at least one of the first support portion and the second support portion includes a screw portion that is screwed onto the outer peripheral surface of the shaft body, and one of the first support portion and the second support portion includes It is preferable that one of the first support portion and the second support portion is configured to press the rotor and the drive gear toward the other side by tightening the screw portion.

  According to this configuration, the pressing force can be adjusted by adjusting the tightening torque of the screw portion. Therefore, the driving force of the rotating electrical machine that transmits the contact surface between the rotor and the driving gear can be adjusted. Furthermore, the distribution of the driving force transmitted through the shaft body and the contact surface can be managed, and the strength of the shaft body, the rotor, and the driving gear can be appropriately designed.

It is sectional drawing of the drive device which concerns on 1st embodiment. It is principal part sectional drawing of the drive device which concerns on 1st embodiment. It is a skeleton figure concerning a wheel drive unit provided with a drive concerning a first embodiment. It is sectional drawing of the drive device which concerns on 2nd embodiment. It is principal part sectional drawing of the drive device which concerns on 2nd embodiment.

[First embodiment]
A first embodiment of a drive device 1 according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the driving device 1. As shown in FIG. 1, the drive device 1 includes a rotary electric machine MG including a rotor 21 and a stator 22, a drive gear 34 that is arranged coaxially with the rotor 21 and rotates integrally with the rotor 21, the rotor 21, and And a shaft body 41 that passes through the drive gear 34 and is arranged coaxially therewith. Here, the first axis X1 is the rotation axis of the drive device 1, and the direction from the drive gear 34 to the rotor 21 along the axial direction L is the axial first direction L1 (the same applies to the left side in FIGS. ), And the direction from the rotor 21 toward the drive gear 34 along the axial direction L is defined as the second axial direction L2 (the right side in FIGS. 1 to 5, the same applies hereinafter). In the present embodiment, the axial direction L, the radial direction, and the circumferential direction are with respect to the first axis X1 unless otherwise specified.

  The drive device 1 is fixed to the shaft body 41 on the first axial direction L1 side with respect to the rotor 21, and includes a first support portion 42 that supports the rotor 21 in the axial direction L from the first axial direction L1 side, and a drive gear. 34, a second support portion 42 that is fixed to the shaft body 41 on the second axial direction L2 side and supports the drive gear 34 in the axial direction L from the second axial direction L2 side. In such a configuration, in particular, the drive device 1 according to the present embodiment includes the rotor 21 and the drive gear 34 sandwiched between the first support portion 42 and the second support portion 43 from both sides in the axial direction, and mutually in the axial direction. It is characterized in that it abuts so as to press. Below, the drive device 1 which concerns on this embodiment is demonstrated in detail.

1. Schematic Configuration of Wheel Drive Unit In this embodiment, a case where the drive device 1 is applied to a wheel drive unit 2 configured for an in-wheel motor will be described.
As shown in FIGS. 1 and 3, the rotating electrical machine MG is disposed around the first axis X <b> 1, the stator 22 fixed to the driving device case 61, the radial inner side of the stator 22, and the driving device case. And a rotor 21 supported so as to be rotatable with respect to 61. The stator 22 has a first coil end portion 24 projecting in the first axial direction L1 from the end surface on the first axial direction L1 side of the stator core, and a second projecting in the second axial direction L2 from the end surface on the second axial direction L2 side of the stator core. A coil end portion 23. The rotor 21 includes a rotor core 25, a first end plate 32 and a second end plate 31, and a permanent magnet (not shown). The rotor core 25 is composed of a laminated steel plate in which a large number of annular electromagnetic steel plates are stacked in the axial direction L. The first end plate 32 and the second end plate 31 are members that are disposed on both sides in the axial direction of the rotor core 25 and support the rotor core 25 in the axial direction L. The second coil end portion 23 is the “coil end portion” in the present invention. The second end plate 31 is an “end plate” in the present invention.

  Further, the drive device 1 includes a shaft body 41 that rotates integrally with the rotor 21 with the first axis X1 as a rotation axis. The rotor 21 is drivingly connected via the shaft body 41 so as to rotate integrally with the driving gear 34. In the present embodiment, the inner peripheral surface 51 of the rotor 21 is fitted and connected to the outer peripheral surface 53 of the shaft body 41, and the inner peripheral surface 52 of the drive gear 34 is connected to the outer peripheral surface 53 of the shaft body 41. They are fitted and driven. The drive gear 34 is a gear that outputs the drive force of the rotating electrical machine MG to the outside of the drive device 1. The inner peripheral surface 51 of the rotor 21 and the outer peripheral surface 53 of the shaft body 41 are non-rotatably fitted by forming a key groove extending in the axial direction L or by shrink fitting. Further, between the outer peripheral surface 53 of the shaft body 41 and the inner peripheral surface 52 of the drive gear 34, a rotation stop fitting is performed by forming a spline fitting groove extending in the axial direction L. The drive connection refers to a state where two rotating elements are connected so as to be able to transmit a driving force.

  The rotating electrical machine MG can perform a function as a motor (electric motor) that generates power upon receiving power supply and a function as a generator (generator) that generates power upon receiving power supply. It is said that. Therefore, rotating electrical machine MG is electrically connected to a power storage device such as a battery. In this example, the rotating electrical machine MG mainly functions as a motor that outputs a driving force for running the vehicle. However, when the vehicle is decelerated, the rotating electrical machine MG may function as a generator that regenerates the inertial force of the vehicle as electric energy.

  As shown in the skeleton diagram of FIG. 3, the drive device 1 according to the present embodiment is provided on the radially inner side of the wheel 74 of the wheel W and is configured as an in-wheel motor. Therefore, the drive device 1 is particularly required to be reduced in size and weight. The wheel 74, the tire 75, and the wheel shaft O constituting the wheel W are configured to rotate integrally around the second axis X2 arranged in parallel with the first axis X1. The driving force of the rotating electrical machine MG output from the drive gear 34 is transmitted to the wheel W side via the input gear 72, the input shaft I, and the planetary gear mechanism PG that rotate about the second axis X2 coaxial with the wheel W. Is transmitted to. In this example, the drive gear 34 and the input gear 72 are drivingly connected by a chain 71. The driving force of the rotating electrical machine MG input to the input gear 72 is input to the sun gear S of the planetary gear mechanism PG via the input shaft I. Here, the planetary gear mechanism PG is a single-pinion type planetary gear mechanism, and is composed of three rotating elements: a carrier CA that supports a plurality of pinion gears P, a sun gear S and a ring gear R that mesh with the pinion gears P, respectively. Yes. The ring gear R is fixed to the vehicle body side, and the rotation of the rotating electrical machine MG input to the sun gear S is decelerated and output from the carrier CA, and the driving force amplified thereby is coupled to the carrier CA. Is transmitted to. Then, the driving force of the rotating electrical machine MG input to the wheel shaft O is output to the tire 75 via the wheel 74 to drive the vehicle. In this example, the wheel drive unit 2 includes a brake disc 73 that rotates integrally with the wheel shaft O and a brake B that is fixed to the vehicle body and sandwiches the brake disc 73 as a braking device.

2. Next, the configuration and arrangement of each component of the drive device 1 according to this embodiment will be described in detail with reference to FIGS.

2-1. Drive Device Case Each component other than the wheel W of the wheel drive unit 2 is housed in the case. Hereinafter, the drive device case 61 which is a case around the rotating electrical machine MG shown in FIG. 1 will be described. To do.
The drive device case 61 is a member that houses each component of the drive device 1 such as the rotating electrical machine MG, the shaft body 41, and the drive gear 34, and is a non-rotating member that is fixed to the vehicle body side. The drive device case 61 is configured to be separable into a case main body 65 and a case cover 66 attached in the second axial direction L2 of the case main body 65. These are fastened and fixed to each other using fastening members such as bolts. Note that the case body 65 and the case cover 66 are axial positions where the tooth portions 35 of the drive gear 34 are disposed, and pass the chain 71 at circumferential positions from the drive gear 34 toward the input gear 72. Openings that are not joined to each other are included.

  The case main body 65 has a case peripheral wall portion 67 formed in a cylindrical shape so as to cover the outer periphery of the rotating electrical machine MG, and the case peripheral wall portion 67 so as to close the end opening of the case peripheral wall portion 67 in the first axial direction L1. The disk-shaped main body cover part 68 is provided to extend radially inward from the end in the first axial direction L1. The stator 22 is fixed to the inner peripheral surface of the case peripheral wall portion 67. The main body cover portion 68 extends from the end surface of the main body cover portion 68 on the second axial direction L2 side in the second axial direction L2 and extends in the circumferential direction of the first axial center X1. have.

The case cover 66 is a disk-shaped member extending radially inward from the position of the end portion of the case peripheral wall 67 in the second axial direction L2 so as to close the end opening in the second axial direction L2 of the case body 65. It is. A stator of the resolver 64 is fixed to the inner surface of the case cover 66. The case cover 66 has a cylindrical second boss portion 70 extending from the end surface of the case cover 66 on the first axial direction L1 side in the first axial direction L1 and extending in the circumferential direction of the first axial center X1. is doing.
Here, the center lines of the cylinders of the first boss portion 69 and the second boss portion 70 coincide with the first axis X1. The first support bearing 63 and the second support bearing 62 that support the shaft body 41 rotatably around the first axis X1 are fitted on the inner peripheral surfaces of the first boss portion 69 and the second boss portion 70, respectively. Combined and supported. The 1st support bearing 63 and the 2nd support bearing 62 are bearings, such as a ball bearing, for example, and the external shape is cylindrical shape in this example.

2-2. Schematic Arrangement of Rotating Member Next, a schematic arrangement of each rotating member housed in the drive device case 61 will be described.
The drive device case 61 supports the shaft body 41 through the first support bearing 63 and the second support bearing 62 so as to be rotatable around the first axis X1. In the present embodiment, the shaft body 41 has an end portion in the first axial direction L1 fitted to the inner peripheral surface of the first support bearing 63 supported by the first boss portion 69, and the first axial center X1. It is supported so that it can rotate around. Further, the end of the shaft body 41 in the second axial direction L2 is fitted to the inner peripheral surface of the second support bearing 62 supported by the second boss portion 70, and rotates around the first axis X1. Supported as possible. The shaft body 41 is an axial position where the first support bearing 63 and the second support bearing 62 are fitted, and the diameter of the outer peripheral surface 53 of the shaft body 41 is reduced compared to the other axial positions. Is formed. The side surfaces of the step in the axial direction come into contact with the side surfaces of the first support bearing 63 and the second support bearing 62, and the axial position of the shaft body 41 is restricted.

  The shaft body 41 passes through the rotor 21 and the drive gear 34 and is arranged coaxially therewith. The shaft body 41 rotates integrally around the first axis X1 and transmits the driving force of the rotating electrical machine MG to the driving gear 34. In the present embodiment, the shaft body 41 is formed in a cylindrical shape, and penetrates in the axial direction L on the radial inner side of each member such as the rotor 21, the drive gear 34, the second support portion 43, and the rotor of the resolver 64. In addition, the outer peripheral surface 53 of the shaft body 41 is in contact with the inner peripheral surface of each member. The rotor 21 is disposed on the shaft first direction L1 side portion of the shaft body 41, and the drive gear 34 is disposed on the shaft second direction L2 side with respect to the rotor 21. A first support portion 42 is disposed on the first axial direction L1 side with respect to the rotor 21, and a second support portion 43 is disposed on the second axial direction L2 side with respect to the drive gear 34. In addition, the rotor of the resolver 64 is arrange | positioned with respect to the 2nd support part 43 at the axial 2nd direction L2 side.

2-3. Next, the characteristic configuration of the drive device 1 according to the present embodiment will be described in more detail.
The first support portion 42 is fixed to the shaft body 41 on the first axial direction L1 side with respect to the rotor 21, and supports the rotor 21 in the axial direction L from the first axial direction L1 side. In the present embodiment, the first support portion 42 is formed integrally with the shaft body 41. And the 1st support part 42 is provided in the axial direction L between the area | region where the 1st support bearing 63 is fitted, and the area | region where the rotor 21 is fitted, and the shaft body in the arrangement position of the rotor 21 It is an annular plate-like flange portion extending radially outward from the outer peripheral surface 53 of 41 by a predetermined length. In the illustrated example, the first support portion 42 extends to a position that is about half the radial thickness of the rotor 21.

  The second support portion 43 is fixed to the shaft body 41 on the second axial direction L2 side with respect to the drive gear 34, and supports the drive gear 34 in the axial direction L from the second axial direction L2 side. In the present embodiment, the second support portion 43 is a nut-like member that includes a screw portion 44 that is screwed onto the outer peripheral surface 53 of the shaft body 41, and is separate from the shaft body 41. On the outer peripheral surface 53 of the shaft body 41, a thread groove 45 is formed that is retracted radially inward at an axial position where the second support portion 43 is screwed.

  The rotor 21 and the drive gear 34 are sandwiched from both sides in the axial direction by the first support part 42 and the second support part 43 and are in contact with each other so as to press each other in the axial direction L. In this embodiment, the 2nd support part 43 is comprised so that the rotor 21 and the drive gear 34 may be pressed toward the axial 1st direction L1 side by tightening the screw part 44 with which the 2nd support part 43 is provided. Yes. The pressing force can be adjusted by adjusting the tightening torque of the screw part 44 of the second support part 43. The force that the second support portion 43 presses toward the first axial direction L1 is received by the first support portion 42 on the first shaft side. And the 1st support part 42 presses the rotor 21 and the drive gear 34 toward the axial 2nd direction L2 side as reaction force. Therefore, by tightening the screw portion 44, the rotor 21 and the drive gear 34 are sandwiched and pressed from both sides in the axial direction by the first support portion 42 and the second support portion 43, and the rotor 21 and the drive gear 34 come into contact with each other. They are pressed against each other in the axial direction L.

  On the contact surface between the rotor 21 and the drive gear 34, a frictional force acting in the circumferential direction in proportion to the pressing force is generated. The driving force of the rotating electrical machine MG is a circumferential force acting on the rotor 21. Therefore, the driving force of the rotating electrical machine MG can be directly transmitted from the rotor 21 to the driving gear 34 via the contact surface. The driving force of the rotating electrical machine MG transmitted from the rotor 21 to the driving gear 34 via the shaft body 41 can be reduced by the amount transmitted through the contact surface. Therefore, the strength required for the shaft body 41 is reduced, and the diameter of the outer peripheral surface 53 of the shaft body 41 can be reduced to reduce the size of the rotating electrical machine MG or to reduce the weight of the shaft body 41.

  In the present embodiment, the rotor 21 includes a second end plate 31 having an annular plate-like portion 33 that contacts the end surface of the rotor core 25 on the second axial direction L2 side, and the first axial direction L1 side of the rotor core 25. And an annular plate-shaped first end plate 32 that comes into contact with the end face. The end plates 31 and 32 sandwich and support a rotor core 25 made of a laminated steel plate in which a large number of annular electromagnetic steel plates are stacked in the axial direction L from both sides in the axial direction, and remove a permanent magnet (not shown) inserted into the core. Acts as a stop. The outer diameters of the annular plate-like portions of the first end plate 32 and the second end plate 31 are formed substantially the same as the outer diameter of the annular plate-like portion of the rotor core 25. Thereby, the first end plate 32 and the second end plate 31 can transmit the pressing force from the first support portion 42 and the second support portion 43 to the entire end surfaces of the rotor core 25 in the axial direction. it can. The second end plate 31 of the rotor 21 is in contact with the drive gear 34 at the end surface on the second axial direction L2 side. The second end plate 31 is an “end plate” in the present invention.

  The drive gear 34 includes a tooth portion 35 that is a gear that outputs the drive force of the rotating electrical machine MG to the outside of the drive device 1. In the present embodiment, the tooth portion 35 includes a cylindrical support cylindrical portion that is fitted to the shaft body 41, and sprocket teeth that are provided on the outer peripheral surface of the support cylindrical portion and engage with the chain 71. . In the present embodiment, the drive gear 34 is integrally provided with the tooth portion 35 with a spacer portion 36 that separates the tooth portion 35 and the annular plate-like portion 33 of the second end plate 31 in the axial direction L. Yes. The axial length U1 of the spacer portion 36 is from the axial second direction L2 side end surface of the annular plate-shaped portion 33 of the second end plate 31 to the axial second direction L2 side of the second coil end portion 23 of the stator 22. It is formed to be longer than the axial length U2 to the end surface. Thus, the tooth portion 35 of the drive gear 34 is disposed so as to be positioned on the second axial direction L2 side with respect to the second coil end portion 23 of the stator 22. Therefore, the chain 71 for drivingly connecting the tooth portion 35 of the drive gear 34 and the input gear 72 can be arranged on the second axial direction L2 side with respect to the second coil end portion 23, and the second coil end portion 23. Can be arranged avoiding in the axial direction L.

  As shown in FIG. 2, the spacer portion 36 includes a cylindrical main body portion 37 disposed on the outer side in the radial direction of the shaft body 41, and an annular plate-like portion 33 of the main body portion 37 and the second end plate 31. And a load transmitting portion 38 that is enlarged in the radial direction with respect to the main body portion 37. In the present embodiment, the main body portion 37 is formed in a cylindrical shape. Further, the load transmitting portion 38 of the spacer portion 36 is gradually expanded radially outward with respect to the outer peripheral surface of the cylindrical main body portion 37 as it approaches the end surface on the first axial direction L1 side. In this example, the outer surface of the main body 37 is enlarged radially outwardly in two steps, and the outer peripheral surface of the main body 37 and the first step are connected by a first curved inclined portion R3 having a circular arc shape in cross section. It gradually expands outward, and the first stage and the second stage are connected by a second curved slope portion R4 having an arcuate cross section and gradually expand outward in the radial direction. By providing such a load transmission part 38, the contact surface between the rotor 21 and the drive gear 34 can be expanded in the radial direction.

By expanding the contact surface, it is possible to disperse the pressing force in the axial direction L and reduce the load per unit area of the contact surface. This increases the margin up to the critical load at which the contact surface begins to plastically deform or reduces the elastic deformation of the contact surface. Therefore, the load per unit area of the contact surface is increased and the axial direction L is pushed. The pressure can be increased. Accordingly, it is possible to increase the pressing force of the contact surface while suppressing the deformation of the contact surface, compared to the case where the load transmitting portion 38 is not provided.
Further, the expansion of the contact surface increases the friction coefficient of the entire contact surface, thereby increasing the friction force acting in the circumferential direction of the contact surface. In particular, since the diameter of the contact surface is enlarged, the transmittable torque can be increased. Further, as described above, the pressing force on the contact surface can be increased, so that the frictional force can be increased also in terms of load. Accordingly, it is possible to increase the driving force of the rotating electrical machine MG that can be directly transmitted from the rotor 21 to the driving gear 34 via the contact surface. Accordingly, the driving force of the rotating electrical machine MG transmitted from the rotor 21 to the driving gear 34 via the shaft body 41 can be reduced. Therefore, the diameter of the outer peripheral surface 53 of the shaft body 41 can be further reduced to reduce the size of the shaft body 41 and the rotating electrical machine MG, or to reduce the weight of the shaft body 41 and the rotating electrical machine MG. In addition, due to the pressing force in the axial direction L generated by the first support part 42 and the second support part 43, the contact surface between adjacent electromagnetic steel plates in the rotor core 25, that is, the rotor core 25 and the second A frictional force is also generated on the contact surface between the one end plate 32 or the second end plate 31, and the driving force of the rotating electrical machine MG can be transmitted to the driving gear 34 through the rotor 21.

Further, the load transmission portion 38 includes a two-step step, a first curved surface inclined portion R3, and a second curved surface inclined portion R4, and as it approaches the end surface (contact surface) on the first axial direction L1 side, Therefore, the pressing force acting on the main body portion 37 from the second support portion 43 can be gradually diffused radially outward as it approaches the end surface on the first axial direction L1 side. .
Compared with the case where the load transmitting portion 38 and the main body portion 37 are formed in an L shape, the gradually enlarged portion serves as a beam that supports the L shape obliquely inside, and the load transmitting portion 38 The rigidity for maintaining the L-shape can be increased with respect to the load in the axial direction L acting on the radially outer side (the tip side of the L-shape). Therefore, the axial first direction L1 side end surface of the spacer portion 36 can be kept parallel to the axial second direction L2 side end surface of the annular plate-shaped portion 33 of the second end plate 31. That is, it is possible to prevent the radially outer portion of the load transmitting portion 38 from being deformed and being lifted from the second end plate 31 by the two steps, the first curved surface inclined portion R3, and the second curved surface inclined portion R4. Therefore, the substantial contact surface between the rotor 21 and the drive gear 34 can be enlarged.
Therefore, the pressing force does not act on the inner side in the radial direction of the contact surface, and can be distributed and acted evenly on the outer side in the radial direction. Moreover, in this example, since the load transmission part 38 is expanded in steps, the load transmission part 38 can be formed in a cylindrical shape combination, and the processing of the load transmission part 38 can be facilitated.

  In the present embodiment, when the diameter Y1 of the root circle of the tooth portion 35 of the drive gear 34 is compared with the outer diameter Y2 of the annular plate-like portion 33 of the second end plate 31, the root circle of the tooth portion 35 is compared. Is smaller than the outer diameter Y2 of the annular plate portion 33. Therefore, the spacer portion 36 is formed integrally with the drive gear 34. Accordingly, the smaller one of the diameter of the root circle of the tooth portion 35 of the drive gear 34 and the outer diameter of the annular plate-like portion 33 of the second end plate 31 is integrated with the spacer portion 36 to increase the size. The contact surface between the rotor 21 and the drive gear 34 can be formed in accordance with the diameter of the other direction. That is, the outer diameter of the load transmitting portion 38 of the spacer portion 36 is larger than the diameter Y1 of the root circle, and can be expanded to the outer diameter Y2 of the annular plate-shaped portion 33 of the second end plate 31. The contact surface with the drive gear 34 can be further enlarged. Therefore, the pressing force of the contact surface can be further increased, and the driving force of the rotating electrical machine MG that can be directly transmitted from the rotor 21 to the drive gear 34 via the contact surface can be further increased.

  As shown in FIG. 1, the diameter of the outer peripheral surface 53 of the shaft body 41 is the same in a region in contact with the inner peripheral surface 51 of the rotor 21 and a region in contact with the inner peripheral surface 52 of the drive gear 34. In the present embodiment, the diameter of the outer peripheral surface 53 of the shaft body 41 is a region where the rotor 21 and the drive gear 34 are disposed, that is, between the first support portion 42 and the second support portion 43 in the axial direction. The entire region is formed with the same diameter. A plurality of grooves extending in the axial direction L for spline fitting are formed on the outer peripheral surface 53 of the shaft body 41 in a region in contact with the inner peripheral surface 52 of the drive gear 34. The diameter is the same as that of the region where no groove is formed.

  In the present embodiment, the rotor 21 and the drive gear 34 are put together and supported by the first support portion 42 and the second support portion 43 from both sides in the axial direction and supported in the axial direction L. A new support portion such as a nut or an axial step, which is different from the support portions 42 and 43, is provided between the rotor 21 and the drive gear 34 in the axial direction L. Absent. If a new support portion is provided, it is necessary to form a retraction portion that retreats in the radial direction, such as a screw groove or an axial step, on the outer peripheral surface 53 of the shaft body 41. The diameter becomes small, and the strength of the shaft body 41 decreases. In particular, since the driving force of the rotating electrical machine MG transmits the shaft body 41 between the rotor 21 and the drive gear 34 in the axial direction, it is necessary to ensure the strength of the shaft body 41 between the axial directions. In this regard, in the present embodiment, since the support portion is not provided between the rotor 21 and the drive gear 34 in the axial direction, the outer peripheral surface 53 of the shaft body 41 is maintained at the same diameter even between the axial directions. And a reduction in the strength of the shaft body 41 can be suppressed.

  Each member through which the shaft body 41 penetrates is assembled by being inserted into the shaft body 41 in the insertion direction from the open side in order from the member arranged on the back side in the insertion direction (axis first direction L1 side). In order to support the annular member inserted into the shaft body 41 in the axial direction L with respect to the shaft body 41, it is necessary to form a retraction portion that retreats radially inward on the outer peripheral surface 53. In order to insert the member in contact with the outer peripheral surface 53 of the retraction part into the shaft body 41 from the front side in the insertion direction (axis second direction L2 side), the diameter of the outer peripheral surface 53 on the front side in the insertion direction from the position of the retraction part Needs to be retreated to a diameter equal to or less than the diameter at the retirement portion. Therefore, when the retraction portion for supporting in the axial direction is formed on the outer peripheral surface 53, the diameter of the outer peripheral surface 53 on the front side in the insertion direction from the retraction portion is reduced to be equal to or less than the same diameter as the retraction portion. Accordingly, when a plurality of retraction portions are formed, the diameter of the outer peripheral surface 53 decreases stepwise for each retraction portion along the axial direction L toward the insertion direction front side. Therefore, the diameter of the outer peripheral surface 53 on the farthest insertion direction is the largest, the diameter of the outer peripheral surface 53 on the foremost side in the insertion direction is the smallest, and the larger the number of retraction portions formed, the more The diameter of the surface 53 will decrease step by step.

  In the present embodiment, since the first support portion 42 is a flange portion that is integrally formed with the shaft body 41 on the first shaft direction L1 side, each annular member through which the shaft body 41 passes is formed in the back in the insertion direction. Inserted into the insertion direction (first axial direction L1) from the front side (second axial direction L2 side) into the shaft body 41 in order from the member arranged on the side (first axial direction L1 side) and assembled. It is done. Further, in the present embodiment, a thread groove 45 is formed on the front side in the insertion direction of the rotor 21 and the drive gear 34 as a retraction portion for the first axial support toward the front side in the insertion direction. For this reason, the rotor 21 and the drive gear 34 can be arrange | positioned in the insertion direction back | inner side (axis 1st direction L1 back | inner side) where the diameter of the outer peripheral surface 53 of the shaft body 41 becomes the maximum. Therefore, the diameter of the outer peripheral surface of the shaft body 41 can be maximized over the entire portion necessary for the shaft body 41 to transmit the driving force of the rotating electrical machine MG from the rotor 21 to the driving gear 34. The strength of the shaft body 41 for transmitting the driving force of the electric machine MG can be ensured. Further, since the number of retraction portions for supporting the rotor 21 and the drive gear 34 in the axial direction L is the minimum number (one) only of the thread groove 45, the outer peripheral surface 53 that changes stepwise for each retraction portion. The difference between the maximum diameter and the minimum diameter can be minimized.

  On the other hand, the diameter of the outer peripheral surface 53 of the shaft body 41 decreases on the near side in the insertion direction of the screw groove 45 (on the second shaft direction L2 side), but the driving force of the rotating electrical machine MG is not transmitted, so the shaft body 41. Even if the strength of the material decreases, it is relatively acceptable. In this embodiment, the retraction part for supporting the rotor of the resolver 64 in the axial direction L and the second support bearing 62 in the axial direction L are further supported on the outer peripheral surface 53 on the near side in the insertion direction of the screw groove 45. A retraction part is formed.

[Second Embodiment]
Next, a second embodiment of the drive device 1 according to the present invention will be described with reference to the drawings. In the first embodiment, the spacer portion 36 is formed integrally with the tooth portion 35 to constitute the drive gear 34, and is configured separately from the annular plate-like portion 33 of the second end plate 31. It was. However, in this embodiment, as shown in FIGS. 4 and 5, the spacer portion 36 is formed integrally with the annular plate-like portion 33 to form the second end plate 31, and the tooth portion of the drive gear 34. 35 is different from the configuration of 35. Below, the drive device 1 which concerns on this embodiment is demonstrated centering on difference with said 1st embodiment. Note that points not particularly described are the same as those in the first embodiment.

  As described above, in the present embodiment, as shown in FIGS. 4 and 5, the second end plate 31 is a spacer that separates the tooth portion 35 of the drive gear 34 and the annular plate-shaped portion 33 in the axial direction L. The portion 36 is provided integrally with the annular plate-like portion 33. Also in the present embodiment, the axial length U1 of the spacer portion 36 is such that the second coil end portion 23 of the stator 22 extends from the end surface in the axial second direction L2 side of the annular plate-shaped portion 33 of the second end plate 31. It is formed to be longer than the axial length U2 to the end surface on the second axial direction L2 side. Thus, the tooth portion 35 of the drive gear 34 is disposed so as to be positioned on the second axial direction L2 side with respect to the second coil end portion 23 of the stator 22. Therefore, the chain 71 for drivingly connecting the tooth portion 35 of the drive gear 34 and the input gear 72 is arranged on the second axial direction L2 side with respect to the second coil end portion 23, and avoids the second coil end portion 23. Can do.

  The spacer portion 36 is provided in a cylindrical main body portion 37 disposed on the outer side in the radial direction of the shaft body 41, and a connection portion between the main body portion 37 and the annular plate-shaped portion 33. A first load transmission portion 38 enlarged in the radial direction, and a second load transmission portion enlarged in the radial direction with respect to the main body portion 37, provided at a connection portion between the main body portion 37 and the tooth portion 35 of the drive gear 34. 39. Also in this embodiment, the main body 37 is formed in a cylindrical shape. Further, the first load transmitting portion 38 of the spacer portion 36 is gradually enlarged radially outward with respect to the outer peripheral surface of the cylindrical main body portion 37 as approaching the end portion on the first axial direction L1 side. Further, the second load transmitting portion 39 of the spacer portion 36 is gradually enlarged radially outward with respect to the outer peripheral surface of the cylindrical main body portion 37 as approaching the end portion on the second axial direction L2 side. In this example, the first load transmitting portion 38 is expanded radially outward in one step, and the fourth curved surface slope having an arc cross section is formed between the outer peripheral surface of the main body portion 37 and the first step. The first stage and the annular plate-shaped portion 33 are connected by a fifth curved surface inclined portion R7 having an arcuate cross section and connected radially by the portion R6. It is gradually expanding.

  Further, the second load transmitting portion 39 is enlarged radially outward in one step, and the sixth curved inclined portion R8 having an arcuate cross section is formed between the outer peripheral surface of the main body portion 37 and the first step. Are gradually expanded outward in the radial direction. By providing such a second load transmitting portion 39, the contact surface between the rotor 21 and the drive gear 34 can be enlarged in the radial direction. Further, the sixth curved surface inclined portion R8 can prevent the radially outer portion of the second load transmitting portion 39 from being deformed and being lifted from the end surface of the tooth portion 35 of the drive gear 34. Therefore, the substantial contact surface between the rotor 21 and the drive gear 34 can be enlarged.

  Moreover, in this example, since the load transmission parts 38 and 39 are expanded in steps, the load transmission parts 38 and 39 can be formed in a cylindrical shape, and the processing of the load transmission parts 38 and 39 can be facilitated. .

  In the present embodiment, the spacer portion 36 is integrally formed with the annular plate-like portion 33 of the second end plate 31, and has a lower rigidity than the tooth portion 35 of the drive gear 34 that requires high rigidity. A material such as aluminum can be used. Therefore, the weight can be reduced as compared with the spacer portion 36 in the first embodiment. Further, even if the spacer portion 36 has a complicated shape including the main body portion 37 and the load transmission portions 38 and 39, it can be easily processed by cutting or the like.

[Other Embodiments]
(1) In the above embodiments, the case where the rotor 21 and the drive gear 34 are in contact with each other in the axial direction L has been described as an example. However, the embodiment of the present invention is not limited to this. In other words, the rotor 21 and the drive gear 34 may be brought into contact with each other via another member, for example, a sheet-like packing, so as to press each other in the axial direction L. One of the forms. In this case, when a material having a high friction coefficient is used for the interposed member, the driving force of the rotating electrical machine MG transmitted from the rotor 21 to the driving gear 34 by the frictional force can be increased. Similarly, a member such as a sheet-like packing may be interposed between the rotor core 25 and the second support portion 43.

(2) In each of the above embodiments, the case where the contact surface between the rotor 21 and the drive gear 34 is basically flat has been described as an example. However, the embodiment of the present invention is not limited to this. That is, it is possible to provide irregularities such as a groove shape or a tenon shape that retreats or protrudes in the axial direction L on one or both of the end surface on the second axial direction L2 side of the rotor 21 and the end surface on the first axial direction L1 side of the drive gear 34. It is one of the preferred embodiments of the invention. In this case, the unevenness formed on the end surface on the second axial direction L2 side of the rotor 21 and the unevenness formed on the end surface on the first axial direction L1 side of the drive gear 34 are fitted to each other by the convex portion and the concave portion. You may comprise. If comprised in this way, the drive force of the rotary electric machine MG which can be transmitted to the drive gear 34 from the rotor 21 can be reliably increased by meshing engagement, without depending on pressing force like frictional force. Similarly, unevenness may be formed on the contact surface between the rotor core 25 and the second support portion 43.

(3) In said 1st embodiment, the case where the rotor 21 is provided with the 2nd end plate 31 which has the annular plate-shaped part 33 contact | abutted to the end surface of the rotor core 25 at the axial second direction L2 side. Explained in the example. However, the embodiment of the present invention is not limited to this. That is, the rotor 21 is configured not to include the second end plate 31, and the end face on the second axial direction L 2 side of the rotor core 25 is in contact with the drive gear 34. one of. In this case, the axial length of the spacer portion 36 is formed to be longer than the axial length from the axial second direction L2 side end surface of the rotor core 25 to the axial second direction L2 side end surface of the second coil end portion 23. It is preferable. In addition, it is preferable that the outer diameter of the load transmitting portion 38 is substantially the same as the outer diameter of the rotor core 25.

(4) In each of the above-described embodiments, the case where the rotor 21 includes the first end plate 32 that contacts the end surface of the rotor core 25 on the first axial direction L1 side has been described as an example. However, the embodiment of the present invention is not limited to this. That is, the rotor 21 may be configured not to include the first end plate 32, and the end surface on the first axial direction L1 side of the rotor core 25 may be in contact with the first support portion 42. This is one of the embodiments. In this case, it is preferable that the outer diameter of the first support portion 42 is substantially the same as the outer diameter of the rotor 21.

(5) In each of the above embodiments, the case where at least one of the annular portion 33 of the second end plate 31 and the tooth portion 35 of the drive gear 34 is integrally provided with the spacer portion 36 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, it is also a preferred embodiment of the present invention that both the annular portion 33 of the second end plate 31 and the tooth portion 35 of the drive gear 34 include the spacer portion 36. Alternatively, the spacer portion 36 is a separate member that is not integrally formed with either the annular portion 33 of the second end plate 31 or the tooth portion 35 of the drive gear 34, and the rotor 21 and the drive gear 34 are It is also one of the preferred embodiments of the present invention to make contact with each other via the spacer portion 36 so as to press each other in the axial direction L.

(6) In each of the above-described embodiments, the first support portion 42 has been described as an example in which the first support portion 42 extends to a position that is about half the radial length of the annular portion of the rotor 21. However, the embodiment of the present invention is not limited to this. That is, it is also one preferred embodiment of the present invention that the first support portion 42 extends in the radial direction to an arbitrary position up to the position of the outer peripheral surface of the rotor 21. For example, it is preferable that the outer diameter of the first support portion 42 is substantially the same as the outer diameter of the rotor 21.

(7) In the first embodiment described above, the load transmitting portion 38 of the spacer portion 36 has been described as an example in which the load transmitting portion 38 is expanded in the radial direction to a position about half the radial thickness of the rotor 21. . However, the embodiment of the present invention is not limited to this. That is, it is also one preferred embodiment of the present invention that the load transmitting portion 38 of the spacer portion 36 is expanded in the radial direction to an arbitrary position up to the position of the outer peripheral surface of the rotor 21. For example, it is preferable that the outer diameter of the load transmitting portion 38 of the spacer portion 36 is substantially the same as the outer diameter of the rotor 21.

(8) In each of the above-described embodiments, the case where the load transmitting portions 38 and 39 are enlarged stepwise in the radial direction has been described as an example. However, the embodiment of the present invention is not limited to this. That is, it is one of preferred embodiments of the present invention that the load transmitting portions 38 and 39 are continuously expanded in the radial direction, or formed in a rib shape and expanded in the radial direction. It is. Moreover, the shape of the load transmission parts 38 and 39 is not restricted to the curved surface of the circular arc-shaped cross-section depressed toward the inside in the radial direction as described above. For example, it is preferable that the cross-sectional shape of the load transmitting portions 38 and 39 is an arc shape protruding outward in the radial direction, an inclined linear shape, or an arbitrary curve.

(9) In each of the above embodiments, the diameter of the outer peripheral surface 53 of the shaft body 41 is the same in the region in contact with the inner peripheral surface 51 of the rotor 21 and the region in contact with the inner peripheral surface 52 of the drive gear 34. The case is described as an example. However, the embodiment of the present invention is not limited to this. That is, the diameter of the outer peripheral surface 53 of the shaft body 41 may be varied as necessary between a region in contact with the inner peripheral surface 51 of the rotor 21 and a region in contact with the inner peripheral surface 52 of the drive gear 34. This is one of the preferred embodiments. Further, the diameter of the outer peripheral surface 53 of the shaft body 41 is a region that does not contact the inner peripheral surface 51 of the rotor 21 and the inner peripheral surface 52 of the drive gear 34, and may be reduced from the contacting region as necessary. Good.

(10) In each of the above embodiments, the first support portion 42 is a flange portion that is integrally formed with the shaft body 41, and the second support portion 43 is a nut that is screwed into the shaft body 41. Was described as an example. However, the embodiment of the present invention is not limited to this. That is, both the first support portion 42 and the second support portion 43 are nuts that are screwed to the shaft body 41, or the first support portion 42 is a nut that is screwed to the shaft body 41, It is also a preferred embodiment of the present invention that the second support portion 43 is a flange portion formed integrally with the shaft body 41.
The first support portion 42 and the second support portion 43 may be any support member that can generate the pressing force by supporting the rotor 21 and the drive gear 34 in the axial direction L. For example, caulking It may be a member fixed by the above, a snap ring or the like.

(11) In each of the above embodiments, between the inner peripheral surface 51 of the rotor 21 and the outer peripheral surface 53 of the shaft body 41 and between the outer peripheral surface 53 of the shaft body 41 and the inner peripheral surface 52 of the drive gear 34. The case where both of them are fixed to each other has been described as an example. However, the embodiment of the present invention is not limited to this. That is, one or both of the inner peripheral surface 51 of the rotor 21 and the outer peripheral surface 53 of the shaft body 41 and between the outer peripheral surface 53 of the shaft body 41 and the inner peripheral surface 52 of the drive gear 34 are prevented from rotating. It is also one of the preferred embodiments of the present invention to be brought into contact or separated without being fitted. As a result, the driving force of the rotating electrical machine MG transmitted from the rotor 21 to the driving gear 34 via the shaft body 41 can be greatly reduced. In this case, a larger driving force is transmitted through the contact surface between the rotor 21 and the driving gear 34. Accordingly, the strength required for the shaft body 41 is significantly reduced, and the outer diameter of the shaft body 41 is greatly reduced to reduce the size of the shaft body 41 and the rotating electrical machine MG, or to reduce the weight of the shaft body 41. it can. Furthermore, restrictions such as formation of an oil passage in the shaft body 41 and selection of a material can be further reduced.

(12) In the above embodiments, the case where the tooth portion 35 of the drive gear 34 is engaged with the chain 71 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, it is preferable that the tooth portion 35 of the drive gear 34 is engaged with the driven gear, and the tooth portion 35 is a spur gear or a helical gear.

  The present invention relates to a rotating electrical machine having a rotor and a stator, a drive gear that is coaxially arranged with the rotor and rotates integrally with the rotor, and passes through the rotor and the drive gear to be coaxial with them. It can utilize suitably for the drive device provided with the axis | shaft body arrange | positioned.

1: Drive device 2: Wheel drive unit 21: Rotor 22: Stator 23: Second coil end portion (coil end portion)
24: First coil end portion 25: Rotor core 31: Second end plate (end plate)
32: First end plate 33: Ring plate-shaped portion 34: Drive gear 35: Tooth portion 36: Spacer portion 37: Body portion 38: Load transmitting portion (first)
39: Load transmission part (second)
40: Spline portion 41: Shaft body 42: First support portion 43: Second support portion 44: Screw portion 45: Screw groove 51: Inner peripheral surface 52 of rotor: Inner peripheral surface 53 of drive gear 53: Outer peripheral surface of shaft 61: drive device case 62: second support bearing 63: first support bearing 64: resolver 65: case main body 66: case cover 67: case peripheral wall portion 68: main body cover portion 69: first boss portion 70: second boss portion 71: Chain 72: Input gear 73: Brake disc 74: Wheel 75: Tire MG: Rotating electric machine B: Brake I: Input shaft O: Wheel shaft Y1: Diameter of root circle of tooth portion Y2: Outer diameter X1: First axis X2: Second axis L: Axial direction L1: First axis direction L2: Second axis direction

Claims (7)

A rotating electrical machine having a rotor and a stator, a drive gear arranged coaxially with the rotor and rotating integrally with the rotor, and a shaft passing through the rotor and the drive gear and arranged coaxially therewith A drive device comprising a body,
The direction from the drive gear to the rotor in the axial direction is the first axis direction, and the direction from the rotor to the drive gear in the axial direction is the second axis direction.
A first support portion fixed to the shaft body on the first axial direction side with respect to the rotor, and supporting the rotor in the axial direction from the first axial direction side;
A second support portion fixed to the shaft body on the second shaft direction side with respect to the drive gear, and supporting the drive gear in the axial direction from the second shaft direction side;
A drive device in which the rotor and the drive gear are sandwiched from both sides in the axial direction by the first support portion and the second support portion and are in contact with each other so as to press each other in the axial direction. The rotor includes an end plate having an annular plate-like portion that comes into contact with an end surface of the rotor core on the second axial direction side,
At least one of the drive gear and the end plate is integrally provided with a spacer portion that axially separates a tooth portion of the drive gear and the annular plate-like portion of the end plate,
The axial length of the spacer portion is longer than the axial length from the axial second direction side end surface of the annular plate-shaped portion of the end plate to the axial second direction side end surface of the coil end portion of the stator. The drive device according to 1.   The spacer portion includes a cylindrical main body portion disposed radially outside the shaft body, a connection portion between the main body portion and the annular plate-like portion of the end plate, and the main body portion and the drive gear. The drive device according to claim 2, further comprising a load transmitting portion that is provided in at least one of the connection portions with the tooth portion and is expanded in a radial direction with respect to the main body portion.   The spacer portion is integrated with the drive gear or the end plate having the smaller one of the diameter of the root circle of the tooth portion of the drive gear and the outer diameter of the annular plate-like portion of the end plate. The drive device according to claim 2 or 3, wherein the drive device is formed as described above.   The drive device according to any one of claims 2 to 4, wherein the spacer portion is formed integrally with the drive gear. The shaft body includes an outer peripheral surface in contact with an inner peripheral surface of the rotor and an inner peripheral surface of the drive gear,
The diameter of the outer peripheral surface of the shaft body is the same in a region in contact with the inner peripheral surface of the rotor and a region in contact with the inner peripheral surface of the drive gear. Drive device. At least one of the first support portion and the second support portion includes a screw portion that is screwed onto the outer peripheral surface of the shaft body,
By tightening the screw part included in one of the first support part and the second support part, one of the first support part and the second support part faces the other side toward the rotor and the drive gear. The drive device according to any one of claims 1 to 6, wherein the drive device is configured to press the button.

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