WO2020045516A1

WO2020045516A1 - Vehicular drive transmission device and oil passage formation unit

Info

Publication number: WO2020045516A1
Application number: PCT/JP2019/033758
Authority: WO
Inventors: 中森幸典; 佐藤輝
Original assignee: アイシン・エィ・ダブリュ株式会社
Priority date: 2018-08-30
Filing date: 2019-08-28
Publication date: 2020-03-05

Abstract

[Problem] To implement a vehicular drive transmission device equipped with an oil passage formation member and an elastic member, for which there are few constraints on the shape of the periphery of an opening of a case-side oil passage and which are easy to install in the case. [Solution] A vehicular drive transmission device comprising a case 4 forming an accommodation space 3, and an oil passage formation member 6 and elastic member 7 accommodated in the accommodation space 3. The case 4 has a case-side oil passage 24, and an inner wall section 26 in which an opening 25 communicating with the case-side oil passage 24 is formed. The oil passage formation member 6 has a first oil passage 61, and a holding part 62 holding an elastic member 7. The holding part 62 has an inner peripheral surface F1 and a stepped surface F2. The elastic member 7 has a second oil passage 71, and is arranged so as to have a protruding portion 72 protruding toward a reference-direction first side X1 from an end portion of the holding part 62 on the reference-direction first side X1. The protruding portion 72 of the elastic member 7 makes contact with the inner wall section 26, and the first oil passage 61 and the opening 25 communicate via the second oil passage 71.

Description

Vehicle drive transmission device and oil passage forming unit

The present invention relates to a vehicular drive transmission device including a case forming a housing space for housing a drive transmission mechanism, an oil passage forming member and an elastic member housed in the housing space, and an oil passage forming member. The present invention relates to an oil passage forming unit including an elastic member.

背景 The background art will be described below. In the following description, the symbols or names in parentheses are those in prior art documents. A conventional example of such a vehicle drive transmission device and an oil passage forming unit is described in Japanese Patent Application Laid-Open No. 2012-023812 (Patent Document 1). The oil passage forming member (cooling pipe 100) of the vehicle drive transmission device of Patent Literature 1 has a holding portion that holds the elastic member (140) on the first axial side that is one side in the axial direction. The holding portion has an outer peripheral surface, and a step surface provided on the second axial side, which is the other axial side of the outer peripheral surface, and facing the first axial side, and the elastic member is provided with respect to the outer peripheral surface. And is fitted to the holding portion so as to abut from the radially outside and abut against the step surface from the first side in the axial direction.

The surface of the elastic member facing the first side in the axial direction is a frustoconical inclined surface having a smaller diameter toward the first side in the axial direction. A similar inclined surface is also formed at the opening of the oil passage on the inner wall surface of the case, and by contacting the inclined surface of the elastic member with the inclined surface of the inner wall surface of the case, these contact surfaces are sealed, The oil passage of the oil passage formation member is configured to communicate with the oil passage of the case.

JP 2012-023812 A

では In the structure of Patent Document 1, an inclined surface is formed at the opening of the oil passage on the inner wall surface of the case. For this reason, it is necessary to ensure the thickness and the width of the wall surface capable of forming the inclined surface in a region where the opening of the oil passage on the case side is formed. The restrictions on the shape were great. The elastic member is also formed in a truncated cone shape having an inclined surface. For this reason, the elastic member must be thick in both the axial direction and the radial direction, and when assembling the case, the reaction force against pressing the elastic member against the inner wall surface of the case is likely to be large. Workability was not good.

Therefore, there is little restriction on the shape of the case around the opening of the oil passage on the case side, and the vehicle drive transmission device including the oil passage forming member and the elastic member having high workability when assembling to the case, and It is desired to realize an oil passage forming unit with high workability at the time.

In view of the above, the characteristic configuration of the vehicle drive transmission device includes a case that forms a housing space that houses the rotating electric machine and the drive transmission mechanism, and an oil passage forming member and an elastic member that are housed in the housing space. The vehicle drive transmission device, wherein the case has a case-side oil passage, and an inner wall surface formed with an opening communicating with the case-side oil passage and opening toward the housing space. The direction intersecting with the inner wall surface is defined as a reference direction, one side of the reference direction is defined as a first direction in a reference direction, and the opposite side is defined as a second direction in a reference direction. A first oil passage that is provided along and through which oil for cooling the rotating electric machine flows, and a holding portion that is formed at an end of the first side in the reference direction and holds the elastic member, The holding portion has a cylindrical inner peripheral surface, and the base is more than the inner peripheral surface. A step surface provided on the second side in the reference direction and facing the first side in the reference direction, wherein the elastic member has a second oil passage provided along the reference direction, and the inner peripheral surface. Abutting from the inside in the radial direction with respect to the step surface and from the first side in the reference direction in the reference direction from the end of the holding portion on the first side in the reference direction to the first side in the reference direction. The elastic member is disposed so as to have a projecting portion, the projecting portion of the elastic member abuts on the inner wall surface, and the first oil passage and the opening communicate with each other via the second oil passage. On the point.

According to this characteristic configuration, in a state where the elastic member is in contact with the step surface from the first side in the reference direction, the protruding portion protrudes from the end of the holding portion on the first side in the reference direction toward the first side in the reference direction. ing. Therefore, the projecting portion of the elastic member is brought into contact with the inner wall surface and elastically deformed, whereby the space between the oil passage forming member and the inner wall surface can be sealed. Further, since the elastic member is arranged so as to abut against the inner peripheral surface of the holding portion from the radial inner side, when the protruding portion of the elastic member is brought into contact with the inner wall surface, the elastic member is moved in the radial direction. Deformation to the outside can be suppressed. Therefore, the radial thickness of the elastic member can be reduced, and the reaction force of the elastic member when the protruding portion of the elastic member contacts the inner wall surface can be reduced. Therefore, the workability in assembling the case is high. Furthermore, the shape of the periphery of the opening on the inner wall surface only needs to have a surface that comes into contact with the protruding portion of the elastic member, and there is no need to provide an inclined surface or the like. The shape of the case is less restricted.

Further, a characteristic configuration of the oil passage forming unit is an oil passage forming unit including an oil passage forming member and an elastic member, wherein the oil passage forming member includes a first oil passage provided along a reference direction. A holding portion formed at one end of the first reference direction, which is one side of the reference direction, for holding the elastic member, the second side of the second reference direction being opposite to the first side in the reference direction. As the side, the holding portion has a cylindrical inner peripheral surface, and a step surface provided on the second side in the reference direction from the inner peripheral surface and facing the first side in the reference direction, the elastic member Has a second oil passage provided along the reference direction and communicates with the first oil passage, is disposed so as to abut against the inner peripheral surface from the radial inside, and The reference length from the step surface to the end of the holding portion on the first side in the reference direction is the reference length. In longer terms than the length of the direction.

According to this configuration, since the length in the reference direction of the elastic member is longer than the length in the reference direction from the step surface to the end of the holding portion on the first side in the reference direction, the elastic member is moved in the reference direction with respect to the step surface. In a state where the elastic member is in contact with the first side, the elastic member can be protruded from the end of the holding portion on the first side in the reference direction toward the first side in the reference direction. Therefore, the projecting portion of the elastic member is brought into contact with the contact target surface, which is the contact target surface, so that the oil passage can be properly sealed. In addition, since the elastic member is disposed in contact with the inner peripheral surface of the holding portion from the radial inside, when the projecting portion of the elastic member is brought into contact with the contact target surface, the elastic member is Deformation to the outside in the radial direction can be suppressed. Therefore, the radial thickness of the elastic member can be reduced, and the reaction force of the elastic member when the projecting portion of the elastic member is brought into contact with the contact target surface can be reduced. Therefore, the workability when assembling the oil passage forming unit to the assembly target is high.

Sectional view of vehicle drive transmission Sectional view of oil passage forming unit

1. Embodiment An embodiment of a vehicle drive transmission device including an oil passage forming unit 5 will be described with reference to the drawings. In the following description, the “axial direction L” and the “device radial direction R” are defined with reference to the rotation axis of the rotating electric machine M, unless otherwise specified. Further, one side in the axial direction L is defined as an axial first side L1, and the opposite side is defined as an axial second side L2. On the other hand, “unit radial direction Y” is defined with reference to the oil passage forming unit 5. In addition, the terms related to the direction, position, and the like of each member are concepts including a state in which there is a difference due to an allowable error in manufacturing.

駆動 The vehicle drive transmission device 1 includes a case 4 that forms a housing space 3 that houses the drive transmission mechanism 2, and an oil passage forming unit 5 that is housed in the housing space 3. The oil passage forming unit 5 includes an oil passage forming member 6 and an elastic member 7. That is, the vehicle drive transmission device 1 includes the case 4, the oil passage forming member 6 and the elastic member 7.

回転 As shown in FIG. 1, in the present embodiment, the rotating electric machine M is housed in the housing space 3 of the case 4. The rotating electric machine M can perform at least one of a function as a motor (electric motor) that receives power supply and generates power and a function as a generator (generator) that receives power and generates power. It is possible. Therefore, the rotating electric machine M is electrically connected to a power storage device (battery, capacitor, or the like) not shown. The rotary electric machine M receives power supplied from the power storage device and performs power running, or is driven by an external driving force to generate power, and supplies the generated power to the power storage device to store the power.

The rotating electric machine M has a stator St fixed to the case 4 and a rotating electric machine rotor Ro (hereinafter, abbreviated as rotor Ro) rotatably supported on a radially inner side R1 of the stator St. ing. The stator St includes a cylindrical stator core 11 and a coil wound around the stator core 11. Stator core 11 is configured by laminating a plurality of electromagnetic steel sheets. Further, the stator core 11 has a plurality of slots (not shown) that are distributed in the circumferential direction and extend in the axial direction L, and coils formed of conductors are wound around the slots. In the present embodiment, the stator St is a stator St used for the rotating electric machine M driven by three-phase alternating current, and includes three-phase coils of U-phase, V-phase, and W-phase. Portions of the coil that protrude from the stator core 11 on both sides in the axial direction L are coil end portions 12. Hereinafter, the coil end portion 12 protruding in the first axial direction L1 with respect to the stator core 11 will be referred to as a first coil end portion 12A, and the coil end portion 12 projecting in the second axial direction L2 with respect to the stator core 11 will be described. , The second coil end portion 12B.

The rotor Ro has a cylindrical rotor core 13 rotatably supported on the inner side R1 of the stator core 11 in the device radial direction. A rotor shaft 14 extending along the axial direction L is connected to the inner peripheral surface of the rotor core 13. The rotor shaft 14 rotates around the rotation axis of the rotating electric machine M integrally with the rotor core 13. The rotor shaft 14 protrudes in the axial direction L from both end surfaces of the rotor core 13 in the axial direction L. The end of the rotor shaft 14 on the first axial side L1 is rotatably supported by the case 4 (specifically, the first case portion 21 of the case 4) via a first bearing (not shown). An end of the rotor shaft 14 on the second axial side L2 is rotatably supported by the case 4 (specifically, the second case portion 31 of the case 4) via the second bearing 16. Note that the rotor shaft 14, the first bearing, and the second bearing 16 in the rotary electric machine M correspond to the drive transmission mechanism 2. In addition, when an engagement device such as a gear mechanism, a shaft member, and a clutch is arranged in the housing space 3 in addition to the above, they also correspond to the drive transmission mechanism 2.

In the present embodiment, the case 4 includes a first case portion 21 and a second case portion 31 joined to the first case portion 21 from the second axial side L2.
The first case portion 21 includes a first peripheral wall portion 22 surrounding the outer side R2 of the accommodation space 3 in the device radial direction, and a first side wall portion 23 disposed on the first axial side L1 with respect to the accommodation space 3. Have. The first side wall portion 23 is formed in a wall shape extending along the device radial direction R, and the first peripheral wall portion 22 is formed on the second side in the axial direction from the end of the first side wall portion 23 on the device radial outside R2. It is formed in a tubular shape extending to L2. In the illustrated example, the first side wall 23 has a portion (stepped portion) extending in the axial direction L at an intermediate portion in the device radial direction R. The second case portion 31 includes a second peripheral wall portion 32 surrounding the outer side R2 of the accommodation space 3 in the device radial direction, and a second side wall portion 33 disposed on the second axial side L2 with respect to the accommodation space 3. Have. The second side wall portion 33 is formed in a wall shape extending along the device radial direction R, and the second peripheral wall portion 32 is formed on the first side in the axial direction from the end of the second side wall portion 33 on the device radial outside R2. It is formed in a tubular shape extending to L1. The end of the first peripheral wall 22 in the first case portion 21 on the second axial side L2 and the end of the first peripheral wall 22 in the second case 31 on the second axial side L2 are joined. Have been. These joinings are performed using fastening members such as bolts.

The first case portion 21 includes a first case-side oil passage 24, a first inner wall surface 26 in which a first opening 25 communicating with the first case-side oil passage 24 and opening toward the accommodation space 3 is formed. , Is provided. The first case-side oil passage 24 and the first inner wall surface 26 are provided on the first side wall portion 23, and the first opening 25 opens on the first inner wall surface 26 toward the second axial side L2. ing. The first case-side oil passage 24 corresponds to the case-side oil passage, the first opening 25 corresponds to the opening, and the first inner wall surface 26 corresponds to the inner wall surface.

The second case portion 31 has a second inner wall surface formed with a second case-side oil passage 34 and a second opening 35 communicating with the second case-side oil passage 34 and opening toward the accommodation space 3. 36. The second case-side oil passage 34 and the second inner wall surface 36 are provided on the second side wall portion 33, and the second opening 35 opens on the second inner wall surface 36 toward the first axial side L1. ing.

The second case portion 31 includes a concave portion 37 formed so as to be recessed from the second inner wall surface 36 toward the second axial side L2. The recess 37 is formed in the first inner wall surface 26 at a position facing the first opening 25 in the axial direction L. More specifically, the concave portion 37 is formed at a position overlapping with the first opening 25 when viewed in the axial direction L. In addition, the concave portion 37 is formed in such a shape that the end portion of the oil path forming member 6 on the second axial side L2 can be fitted from the first axial side L1. In the present embodiment, the concave portion 37 is formed in a circular shape when viewed in the axial direction L, and the inner diameter of the concave portion 37 and the inner diameter D6 of the second opening 35 are formed in the same size.

The second case portion 31 includes an engaged portion 38 with which the oil passage forming unit 5 is engaged. In the present embodiment, the engaged portion 38 is formed so as to be depressed on the second axial side L2 such that the engaging portion 52 of the oil passage forming unit 5 engages from the first axial side L1. Here, the engaged portion 38 is formed on the second peripheral wall portion 32. The engaging portion 52 is formed on the main body 66 of the oil passage forming member 6 in the oil passage forming unit 5.

嵌合 As will be described later, a fitting portion 53 that fits into the recess 37 is formed at an end of the oil path forming unit 5 on the second axial side L2. By fitting the fitting portion 53 of the oil passage forming unit 5 into the recess 37, the end of the oil passage forming unit 5 on the second axial side L2 is connected to the second opening 35, and the oil passage formation is performed. The unit side oil passage 51 of the unit 5 and the second case side oil passage 34 of the second case portion 31 communicate with each other. By fitting the fitting portion 53 of the oil passage forming unit 5 into the recess 37 and engaging the engaging portion 52 of the oil passage forming unit 5 with the engaged portion 38 in this manner, the oil passage The forming unit 5 can be positioned on the second case portion 31. Then, in this state, the second case portion 31 and the first case portion 21 are joined in the axial direction L.

接合 By joining the first case part 21 and the second case part 31, the end of the oil passage forming unit 5 on the first side L1 in the axial direction comes into close contact with the first inner wall surface 26. Thereby, the end of the first side L1 in the axial direction of the oil passage forming unit 5 is connected to the first opening 25, and the unit side oil passage 51 of the oil passage forming unit 5 and the first case of the first case portion 21 are connected. The side oil passage 24 communicates.

In the present embodiment, the oil flowing in the first case-side oil passage 24 from the device radial inside R1 to the device radial outside R2 passes through the unit-side oil passage 51 and reaches the second case-side oil passage 34. Then, the oil flows through the second case-side oil passage 34 from the device radial outside R2 to the device radial inside R1 to be supplied to the second bearing 16. Thus, the drive transmission mechanism 2 is configured to be supplied with oil. Further, in the present embodiment, the oil passage forming unit 5 is provided with an oil hole 54 through which the oil flows out toward the inner side R1 (here, downward) in the apparatus radial direction. The oil that has flowed out from the oil hole 54 is supplied to each of the first coil end portion 12A, the second coil end portion 12B, and the stator core 11 to be cooled. This will be described in detail later.

Next, the oil passage forming member 6 and the elastic member 7 of the oil passage forming unit 5 will be described.
In the present embodiment, the oil passage forming unit 5 is installed in the vehicle drive transmission device 1 in a posture in which the reference direction X is parallel to the axial direction L. That is, in the state shown in FIG. 1, the reference direction X and the axial direction L are the same direction. Therefore, the reference direction X is a direction that intersects the first inner wall surface 26, and more specifically, is a direction that is orthogonal to the first inner wall surface 26. When one side of the reference direction X is defined as a first direction X1 in the reference direction and the opposite side is defined as a second side X2 in the reference direction, the oil path forming unit 5 is configured such that the first side X1 in the reference direction is the first side in the axial direction. It is installed on the vehicle drive transmission device 1 in such a posture that it is on the same side as L1 and the second reference side X2 is on the same side as the second axial side L2.

As shown in FIG. 2, the oil passage forming member 6 has a first oil passage 61 provided along the reference direction X and a holding member formed at an end of the first side X1 in the reference direction to hold the elastic member 7. And a portion 62. The holding portion 62 includes a first inner peripheral surface F1 which is a cylindrical inner peripheral surface, and a step surface F2 which is provided on the second side X2 in the reference direction from the first inner peripheral surface F1 and faces the first side X1 in the reference direction. ,have. In the present embodiment, the holding portion 62 is formed in a cylindrical shape. Specifically, the holding part 62 is formed in a cylindrical shape. Therefore, the first inner peripheral surface F1 is also formed in a cylindrical shape. The holding portion 62 also has a cylindrical (here, cylindrical) outer peripheral surface. The step surface F2 is formed so as to connect the first inner peripheral surface F1 of the holding portion 62 and the second inner peripheral surface F3 which is the inner peripheral surface of the first oil passage 61. That is, the first inner peripheral surface F1 of the holding portion 62 has a larger diameter than the second inner peripheral surface F3 of the first oil passage 61, and the step surface F2 is formed of the first inner peripheral surface F1 and the second inner peripheral surface F2. It is a step surface formed by a difference in diameter from the inner peripheral surface F3. In this example, the step surface F2 is an annular plane orthogonal to the reference direction X. The shape of the step surface F2 is not limited to this, and may be any shape that can support the elastic member 7 from the second side X2 in the reference direction.

The elastic member 7 has a second oil passage 71 provided along the reference direction X. Further, the elastic member 7 is in contact with the first inner peripheral surface F1 from the radial inside, and is in contact with the stepped surface F2 from the first side X1 in the reference direction. It is arranged so as to have a protruding portion 72 protruding from the end of the side X1 to the first side X1 in the reference direction. In the present embodiment, the elastic member 7 is formed in a cylindrical shape. More specifically, the elastic member 7 is formed in a cylindrical shape. Thus, a second oil passage 71 having a cylindrical inner surface is formed. The first oil passage 61 and the second oil passage 71 communicate with each other. Further, as shown in FIG. 1, when the oil passage forming unit 5 is installed in the vehicle drive transmission device 1, the protruding portion 72 of the elastic member 7 abuts on the first inner wall surface 26, and the first oil passage 61 And the first opening 25 communicate with each other via the second oil passage 71. Here, the protruding portion 72 of the elastic member 7 is pressed against the first inner wall surface 26 and abuts on the first inner wall surface 26 in an elastically deformed state. Thus, the tightness of the connection between the unit-side oil passage 51 (the first oil passage 61 and the second oil passage 71) and the first case-side oil passage 24 (the first opening 25) is ensured.

Here, the first length D7 that is the length of the elastic member 7 in the reference direction X is a second length D8 that is the length from the step surface F2 to the end of the holding portion 62 on the first side X1 in the reference direction. Longer. Therefore, in a state where the elastic member 7 is in a natural state and the elastic member 7 is in contact with the step surface F2 from the first side X1 in the reference direction, the elastic member 7 is located at the end of the holding portion 62 on the first side X1 in the reference direction. A protruding portion 72 protruding from the portion on the first side X1 in the reference direction is formed. The diameter of the outer peripheral surface of the elastic member 7 is equal to the diameter of the first inner peripheral surface F1. In addition, since the elastic member 7 also has elasticity in the unit radial direction Y, it is not necessary that the diameter of the outer peripheral surface of the elastic member 7 and the diameter of the first inner peripheral surface F1 match with high accuracy. Therefore, the diameter of the outer peripheral surface of the elastic member 7 may be slightly larger than the diameter of the first inner peripheral surface F1, or may be slightly smaller. In any case, the diameter of the outer peripheral surface of the elastic member 7 is such that the outer peripheral surface of the elastic member 7 comes into contact with the first inner peripheral surface F1 from the radial inside in a state where the hydraulic pressure acts on the second oil passage 71. It is good to be set as follows.

As shown in FIG. 2, in the present embodiment, the oil passage forming member 6 includes, in addition to the first oil passage 61, a throttle portion 63 disposed on the second side X2 in the reference direction with respect to the first oil passage 61. A third oil passage 64 disposed on the second side X2 in the reference direction from the throttle 63. The unit-side oil passage 51 of the oil passage formation unit 5 is formed to include the first oil passage 61, the throttle unit 63, the third oil passage 64, and the second oil passage 71 of the elastic member 7. The first oil passage 61, the throttle portion 63, and the third oil passage 64 are formed in the stated order so as to be continuous from the reference direction first side X1 to the reference direction second side X2. That is, the third oil passage 64 communicates with the first oil passage 61 via the throttle portion 63.

The oil passage forming member 6 will be described. The oil passage forming member 6 includes a main body 66 having the first oil passage 61, a throttle forming portion 67 having the throttle 63, and a third oil passage forming portion having the third oil passage 64, in addition to the holding portion 62. 68. The main body 66 is located on the second side X2 in the reference direction with respect to the holder 62. The aperture forming section 67 is located on the second side X2 in the reference direction with respect to the main body section 66. The third oil passage forming portion 68 is located on the second side X2 in the reference direction with respect to the throttle forming portion 67. In the present embodiment, the holding portion 62, the main body portion 66, the throttle forming portion 67, and the third oil passage forming portion 68 are integrally formed, and all are formed in a cylindrical shape. Further, in the present embodiment, the outer diameter of the main body 66 is the same as the outer diameter of the throttle forming portion 67, the outer diameter of the holding portion 62 is larger than the outer diameter of the main body 66, and the third oil passage forming portion 68 is formed. Is smaller than the outer diameter of the main body 66. These outer diameters may be changed as appropriate. For example, the outer diameter of the holding section 62 may be the same as or smaller than the outer diameter of the main body section 66. Similarly, the outer diameter of the third oil passage forming portion 68 may be the same as or larger than the outer diameter of the main body 66. Further, the outer diameter of the throttle forming portion 67 and the outer diameter of the main body portion 66 may be different.

The third oil passage forming portion 68 is configured to be fittable into the concave portion 37 and functions as the fitting portion 53. That is, the diameter of the outer peripheral surface of the third oil passage forming portion 68 is set to be equal to or less than the diameter of the inner peripheral surface of the concave portion 37. Further, as described above, the outer diameter of the third oil passage forming portion 68 is smaller than the outer diameter of the throttle forming portion 67. Therefore, between the third oil passage forming portion 68 and the throttle forming portion 67, a second step surface F4 facing the second side X2 in the reference direction is formed. Then, as shown in FIG. 1, in a state where the third oil passage forming portion 68 (the fitting portion 53) is fitted in the concave portion 37, the second stepped surface F 4 is moved in the axial first direction with respect to the second inner wall surface 36. Contact from side L1. This restricts the movement of the oil passage forming member 6 to the second axial side L2.

Here, when the elastic member 7 is in a natural state, the distance in the reference direction X between the end of the elastic member 7 on the first side X1 in the reference direction and the second step surface F4 in the oil passage forming unit 5 is equal to the first case portion. The distance in the reference direction X between the first inner wall surface 26 and the second inner wall surface 36 in a state where the first case 21 and the second case portion 31 are joined is set to be larger. Thus, the oil passage forming unit 5 is attached to the case 4 in a state where the elastic member 7 is elastically deformed in the reference direction X. That is, the protruding portion 72 of the elastic member 7 is pressed against the first inner wall surface 26 in a state of being elastically deformed, and the second step surface F4 of the oil passage forming member 6 is brought into contact with the second inner wall surface 36 by the elastic force of the elastic member 7. Pressed. Thereby, a connection portion between the unit-side oil passage 51 (the first oil passage 61 and the second oil passage 71) and the first case-side oil passage 24 (the first opening 25), and the unit-side oil passage 51 (the first oil passage 51). The tightness of the connection between the third oil passage 64) and the second case-side oil passage 34 (second opening 35) is ensured.

The first oil passage 61, the third oil passage 64, and the constricted portion 63 are formed such that the sectional area of the oil passage becomes smaller as the order of description is later. In this example, each of the first oil passage 61, the third oil passage 64, and the constricted portion 63 has a circular cross section, and the inner diameter D 3 of the third oil passage 64 is the inner diameter of the first oil passage 61. The inner diameter D4 of the throttle portion 63 is smaller than the inner diameter D1 of the first oil passage 61 and the inner diameter D3 of the third oil passage 64. Further, the inner diameter D2 of the second oil passage 71 is larger than the largest one of the inner diameter D1 of the first oil passage 61, the inner diameter D3 of the third oil passage 64, and the inner diameter D4 of the throttle 63.

As shown in FIGS. 1 and 2, the inner diameter D2 of the second oil passage 71 is larger than the inner diameter D5 of the first opening 25 and the inner diameter D6 of the second opening 35. In particular, the inner diameter D2 of the second oil passage 71 is assumed with respect to the inner diameter D5 of the first opening 25 in consideration of the displacement of the oil passage forming member 6 with respect to the first opening 25 in the unit radial direction Y. It is preferable that the distance is set to be larger than the maximum displacement amount. In the present embodiment, since the end of the first side L1 in the axial direction of the oil passage forming unit 5 is in close contact with the flat first inner wall surface 26 of the second case portion 31, the reference direction of the oil passage forming unit 5 is set. Since the first side does not have the centering function, there is a possibility that the position of the oil passage forming unit 5 with respect to the first opening 25 is shifted. However, in the configuration of the present embodiment, the inner diameter D2 of the second oil passage 71 is set to be larger than the inner diameter D5 of the first opening 25 by at least the assumed maximum amount of positional deviation, so that the first opening The position deviation of the oil passage forming member with respect to 25 can be allowed, and the space between the oil passage forming unit 5 and the first inner wall surface 26 can be properly sealed. On the other hand, the inner diameter D4 of the throttle 63 and the inner diameter D3 of the third oil passage 64 are smaller than the inner diameter D5 of the first opening 25 and the inner diameter D6 of the second opening 35. Incidentally, in the present embodiment, the inner diameter D5 of the first opening 25 and the inner diameter D6 of the second opening 35 are the same. The inner diameter D1 of the first oil passage 61 is also the same as the inner diameter D5 of the first opening 25 and the inner diameter D6 of the second opening 35.

In the present embodiment, the oil passage forming member 6 has an oil hole 54 communicating with the first oil passage 61 and opening outward in the unit radial direction Y. In the illustrated example, a plurality of oil holes 54 are formed in the main body 66. Specifically, as shown in FIG. 1, the oil passage forming member 6 includes first oil holes 54 </ b> A formed at positions in the axial direction L corresponding to the first coil end portions 12 </ b> A as oil holes 54. It has a second oil hole 54B formed at a position in the axial direction L corresponding to the two coil end portions 12B, and a third oil hole 54C formed at a position in the axial direction L corresponding to the stator core 11.

油 Then, with the oil passage forming unit 5 installed in the vehicle drive transmission device 1, the oil hole 54 opens toward the inside in the device radial direction R1 (here, downward). Therefore, the oil that has flowed out of the first oil passage 61 into the housing space 3 through the first oil hole 54A is mainly supplied to the first coil end portion 12A, and cools the first coil end portion 12A. The oil that has flowed out of the first oil passage 61 into the storage space 3 through the second oil hole 54B is mainly supplied to the second coil end portion 12B, and cools the second coil end portion 12B. The oil that has flowed out of the first oil passage 61 into the housing space 3 through the third oil hole 54C is mainly supplied to the stator core 11, and cools the stator core 11. Then, the oil that has not flowed out from these oil holes 54 flows into the second case-side oil passage 34 from the first oil passage 61 via the throttle portion 63 and the third oil passage 64. The oil flowing into the second case side oil passage 34 is supplied to the second bearing 16 and lubricates the second bearing 16. In such an oil flow path, the throttle 63 is provided downstream of the first oil path 61 as described above. Therefore, by appropriately setting the size and shape of the throttle portion 63, the ratio of the amount of oil flowing out from the plurality of oil holes 54 to the amount of oil flowing into the second case-side oil passage 34 is appropriately adjusted. Can be adjusted.

2. Other Embodiments Next, other embodiments of the vehicle drive transmission device and the oil passage forming unit will be described.

(1) In the above embodiment, the configuration in which the oil passage forming member 6 includes the throttle portion 63 and the third oil passage 64 in addition to the first oil passage 61 has been described as an example, but the invention is not limited thereto. For example, the oil passage forming member 6 includes only the first oil passage 61 without the narrowed portion 63 and the third oil passage 64, or includes the narrowed portion 63 and the third oil passage 64 in addition to the first oil passage 61. It is good also as composition provided with only one of these.

(2) In the above embodiment, the throttle portion 63 is provided integrally with the oil passage forming member 6, but the throttle portion 63 may be formed integrally with the second case portion 31, or It may be formed by a separate member attached to the portion 31.

(3) In the above embodiment, the oil passage forming member 6 includes the oil hole 54 communicating with the first oil passage 61, the second case portion 31 includes the second case side oil passage 34, and the first oil passage 61 A configuration in which a part of the flowing oil flows out of the oil hole 54 into the housing space 3 and the remaining oil flows from the first oil passage 61 into the second case-side oil passage 34 has been described as an example, but is not limited thereto. . For example, the second case portion 31 may not include the second case-side oil passage 34, and all of the oil flowing through the first oil passage 61 may flow out of the oil hole 54 into the housing space 3. Alternatively, the configuration may be such that the oil passage forming member 6 does not include the oil hole 54 and all of the oil flowing through the first oil passage 61 flows into the second case-side oil passage 34.

(4) In the above embodiment, the oil passage forming unit 5 is provided with the engaging portion 52 and the fitting portion 53 in order to position the oil passage forming unit 5 in the second case portion 31. The configuration for positioning the position 5 in the second case portion 31 may be changed as appropriate. For example, when the oil passage forming unit 5 can be positioned in the second case portion 31 only by the fitting portion 53, the oil passage forming unit 5 may not include the engaging portion 52.

(5) In the above embodiment, the case where the rotating electric machine M is accommodated in the accommodating space 3 of the case 4 and the drive transmission mechanism 2 is the rotor shaft 14 of the rotating electric machine M or a bearing thereof has been described as an example. However, the configuration of the drive transmission mechanism 2 housed in the housing space 3 of the case 4 is not limited to this. For example, the drive transmission mechanism 2 may be a stepped or stepless automatic transmission or a manual transmission, or may be a gear mechanism such as a differential device or a reduction gear. Naturally, in these cases, a configuration in which a driving force source such as the rotary electric machine M is not accommodated in the accommodation space 3 of the case 4 may be employed.

(6) In the above embodiment, the case where the reference direction X of the oil passage forming unit 5 is parallel to the axial direction L and the reference direction X is a direction orthogonal to the first inner wall surface 26 has been described as an example. However, it is not limited to such a configuration. The reference direction X may be a direction crossing the axial direction L. Further, the reference direction X may be a direction that intersects the first inner wall surface 26 at an angle other than 90 °.

(7) In the above embodiment, the configuration in which the elastic member 7 is formed in a cylindrical shape has been described as an example, but the configuration is not limited to such a configuration. The elastic member 7 can have various shapes such as an annular shape such as an O-ring or a polygonal cylindrical shape such as a quadrangle or a hexagon when viewed in the reference direction X. In any case, the elastic member 7 is formed so as to have a protruding portion 72 that protrudes from the holding portion 62 to the first reference direction X1 in a state where the elastic member 7 contacts the stepped surface F2 from the first reference direction X1. It should just be done.

(8) It should be noted that the configuration disclosed in each of the above embodiments can be applied in combination with the configuration disclosed in other embodiments as long as no contradiction occurs. Regarding other configurations, the embodiments disclosed in this specification are merely examples in all respects. Therefore, various modifications can be appropriately made without departing from the spirit of the present disclosure.

3. Outline of the above embodiment Hereinafter, an outline of the vehicle drive transmission device and the oil passage forming unit described above will be described.

The vehicular drive transmission device is a vehicular drive transmission device including a case forming a housing space for housing the rotating electric machine and the drive transmission mechanism, and an oil passage forming member and an elastic member housed in the housing space. The case has a case-side oil passage, and an inner wall surface formed with an opening communicating with the case-side oil passage and opening toward the housing space, and intersects the inner wall surface. The oil passage forming member is provided along the reference direction, with the one side of the reference direction being the first direction of the reference direction, and the other side being the second side of the reference direction, the oil passage forming member being provided along the reference direction. A first oil passage through which oil for cooling the electric machine flows; and a holding portion formed at an end on the first side in the reference direction and holding the elastic member, wherein the holding portion has a cylindrical inner shape. A peripheral surface and a second side in the reference direction from the inner peripheral surface. A step surface facing the first side in the reference direction, wherein the elastic member has a second oil passage provided along the reference direction, and the second member has a second oil passage provided along the reference direction from a radially inner side with respect to the inner peripheral surface. The holding portion has a protruding portion that protrudes from the end of the holding portion in the reference direction first side toward the reference direction first side in a state of contact with the step surface from the reference direction first side. The first oil passage and the opening are in communication with each other via the second oil passage, wherein the first oil passage is in contact with the inner wall surface.

According to this configuration, in a state where the elastic member is in contact with the step surface from the first side in the reference direction, the protruding portion protrudes toward the first side in the reference direction from the end of the holding portion on the first side in the reference direction. I have. Therefore, the projecting portion of the elastic member is brought into contact with the inner wall surface and elastically deformed, whereby the space between the oil passage forming member and the inner wall surface can be sealed. Further, since the elastic member is arranged so as to abut against the inner peripheral surface of the holding portion from the radial inner side, when the protruding portion of the elastic member is brought into contact with the inner wall surface, the elastic member is moved in the radial direction. Deformation to the outside can be suppressed. Therefore, the radial thickness of the elastic member can be reduced, and the reaction force of the elastic member when the protruding portion of the elastic member contacts the inner wall surface can be reduced. Therefore, the workability in assembling the case is high. Furthermore, the shape of the periphery of the opening on the inner wall surface only needs to have a surface that comes into contact with the protruding portion of the elastic member, and there is no need to provide an inclined surface or the like. The shape of the case is less restricted.

Here, it is preferable that the elastic member is formed in a cylindrical shape.

According to this configuration, it is possible to make the elastic member have a relatively simple shape, and to contact the entire portion of the elastic member other than the protruding portion with the inner peripheral surface of the holding portion. Therefore, it is easy to reduce the radial thickness of the elastic member while suppressing the elastic member from deforming radially outward. Therefore, the reaction force of the elastic member when the projecting portion of the elastic member is brought into contact with the inner wall surface can be reduced, and the workability in assembling the case to the case can be further improved.

Further, the oil passage forming member has a cylindrical main body portion in which the first oil passage is formed on the second side in the reference direction with respect to the holding portion, and an inner diameter of the holding portion is: It is preferable that the step surface is larger than the inner diameter of the first oil passage and is formed so as to connect the inner peripheral surface of the holding portion and the inner peripheral surface of the first oil passage.

According to this configuration, the step surface can be easily formed by utilizing the difference between the inner diameter of the holding portion and the inner diameter of the first oil passage. Further, since both the main body portion and the holding portion of the oil passage forming member are formed in a cylindrical shape, the shape of the oil passage forming member can be simplified.

It is preferable that the inner diameter of the second oil passage is larger than the inner diameter of the opening and the inner diameter of the first oil passage.

According to this configuration, the flow of oil between the first oil passage and the opening can be prevented from being obstructed by the second oil passage. In addition, since the inner diameter of the second oil passage is larger than the inner diameter of the opening, the entire opening communicates with the second oil passage even when the contact position of the elastic member is shifted in the direction along the inner wall surface due to a mounting error or the like. It is possible to make it.

The case includes a first case portion and a second case portion joined to the first case portion from the second side in the reference direction. The first case portion includes the case-side oil. A first case-side oil passage as a passage, and a first inner wall surface as the inner wall surface, wherein the second case portion is configured such that a second inner wall surface and a second side in the reference direction from the second inner wall surface. A concave portion formed so as to be depressed in the second inner wall surface, wherein the concave portion is formed at a position facing the opening portion in the reference direction on the second inner wall surface, and the oil passage forming member is disposed in the reference direction second side. Is preferably fitted in the recess.

According to this configuration, by fitting the end of the oil passage forming member on the second side in the reference direction into the recess, the oil passage forming member can be appropriately positioned with respect to the second case portion. Then, by joining the first case portion and the second case portion with the oil passage forming member positioned as described above, the protruding portion of the elastic member held by the holding portion of the oil passage forming member is attached to the inner wall surface. The contact between the oil passage forming member and the inner wall surface can be properly sealed.

Further, the second case portion includes a second case-side oil passage, and a second opening communicating with the second case-side oil passage and opening into the concave portion. It is preferable that the second opening communicates with the second opening.

According to this configuration, by fitting the end of the oil passage forming member on the second side in the reference direction into the recess, the first oil passage of the oil passage forming member and the second case side oil passage can be communicated. it can. Therefore, the first case-side oil passage and the second case-side oil passage can be connected using the oil passage forming member.

It is preferable that the oil passage forming member further includes a throttle portion disposed on the second side in the reference direction with respect to the first oil passage.

According to this configuration, the amount of oil flowing from the first oil passage to the second case-side oil passage or the amount of oil flowing from the second case-side oil passage to the first oil passage is reduced in accordance with the oil flow direction. It can be adjusted appropriately by the section. In addition, since such a throttle portion is provided in the oil passage forming member, processing is easier than in the case where the throttle portion is integrally provided on the second case portion side, and a separate body is provided in the second case portion. The number of parts can be reduced as compared with the case where the aperture is attached. Therefore, it is possible to suppress an increase in cost due to the provision of the throttle section.

The oil passage forming member further includes a third oil passage that is arranged on the second side in the reference direction with respect to the throttle portion and communicates with the first oil passage via the throttle portion. It is preferable that the cross-sectional area of the oil passage is smaller in the order of the oil passage, the third oil passage, and the throttle portion in the order of description.

According to this configuration, the first oil passage can be formed by processing the oil passage forming member from the first side in the reference direction, and the third oil passage can be formed by processing the oil passage forming member from the second side in the reference direction. Can be formed. Then, the processing of the narrowed portion having the smallest sectional area of the oil passage can be performed from the shorter one of the first oil passage and the third oil passage in the reference direction. Therefore, all of the first oil passage, the third oil passage, and the throttle portion can be processed relatively easily.

Preferably, the case includes an engaged portion with which an oil passage forming member is engaged, and the oil passage forming member includes an engaging portion with which the engaged portion is engaged.

According to this configuration, when the oil passage forming member is attached to the case, a position shift due to an attachment error can be reduced by engaging the engaging portion with the engaged portion, and the entire opening is connected to the second oil passage. It becomes easy to communicate. Further, it is possible to suppress an increase in the size of the holding portion as compared with a case where the diameter of the second oil passage is increased in order to allow displacement of the oil passage forming member with respect to the case.

The oil passage forming unit is an oil passage forming unit including an oil passage forming member and an elastic member, wherein the oil passage forming member includes a first oil passage provided along a reference direction, and a first oil passage provided in the reference direction. A holding portion formed at one end of the first side in the reference direction and holding the elastic member, wherein the side opposite to the first side in the reference direction is defined as a second side in the reference direction. The portion has a cylindrical inner peripheral surface, and a step surface provided on the second side in the reference direction from the inner peripheral surface and facing the first side in the reference direction, and the elastic member is provided in the reference direction. And a second oil passage communicating with the first oil passage. The second oil passage is disposed so as to abut against the inner peripheral surface from the radial inside, and the length of the elastic member in the reference direction. Is longer than the length in the reference direction from the step surface to the end of the holding portion on the first side in the reference direction. To be suitable.

The technology according to the present disclosure relates to a vehicle drive transmission device including a case accommodating a drive transmission device, an oil passage forming member and an elastic member accommodated in the case, or an oil passage formation member and an elastic member. It can be used for an oil path forming unit provided.

1: Vehicle drive transmission device 2: Drive transmission mechanism 3: Housing space 4: Case 5: Oil passage formation unit 6: Oil passage formation member 7: Elastic member 21: First case portion 24: First case side oil passage ( Case side oil passage)
25: first opening (opening)
26: 1st inner wall surface (inner wall surface)
31: second case portion 34: second case side oil passage 35: second opening 36: second inner wall surface 37: concave portion 61: first oil passage 62: holding portion 63: throttle portion 64: third oil passage 66 : Main body 71: Second oil passage 72: Projecting portion D1: Inner diameter D1 of first oil passage: Inner diameter D7 of second oil passage: First length D8: Second length D9: Inner diameter F1: Holding member 1 Inner peripheral surface (Inner peripheral surface of holding unit)
F2: step surface F3: second inner peripheral surface (inner peripheral surface of first oil passage)
X: Reference direction X1: Reference direction first side X2: Reference direction second side

Claims

A case for forming an accommodation space for accommodating a rotating electric machine and a drive transmission mechanism, and an oil passage forming member and an elastic member accommodated in the accommodation space, the vehicle drive transmission device including:
The case has a case-side oil passage, and an inner wall surface formed with an opening communicating with the case-side oil passage and opening toward the housing space,
A direction intersecting the inner wall surface is defined as a reference direction, one side of the reference direction is defined as a reference direction first side, and the opposite side is defined as a reference direction second side.
The oil passage forming member is provided along the reference direction and has a first oil passage through which oil for cooling the rotating electric machine flows, and is formed at an end on the first side in the reference direction to hold the elastic member. And a holding part,
The holding portion has a cylindrical inner peripheral surface, and a step surface provided on the second side in the reference direction from the inner peripheral surface and facing the first side in the reference direction,
The elastic member has a second oil passage provided along the reference direction, abuts the inner peripheral surface from a radially inner side, and contacts the step surface from the first side in the reference direction. In the contact state, the holding portion is disposed so as to have a protruding portion that protrudes from the end of the first side in the reference direction to the first side in the reference direction,
The projecting portion of the elastic member abuts on the inner wall surface, and the first oil passage and the opening communicate with each other via the second oil passage.
Vehicle drive transmission device.
The case includes a first case portion, and a second case portion joined to the first case portion from the second side in the reference direction.
The first case portion includes a first case-side oil passage as the case-side oil passage, and a first inner wall surface as the inner wall surface,
The second case portion includes a second inner wall surface, and a concave portion formed so as to be depressed from the second inner wall surface toward the second side in the reference direction.
The recess is formed at a position facing the opening in the reference direction on the second inner wall surface,
2. The vehicle drive transmission device according to claim 1, wherein the oil passage forming member has an end on the second side in the reference direction fitted into the recess. 3.
The second case portion includes a second case-side oil passage, and a second opening communicating with the second case-side oil passage and opening into the recess.
The drive transmission device for a vehicle according to claim 2, wherein the first oil passage and the second opening communicate with each other.
4. The vehicle drive transmission device according to claim 3, wherein the oil passage forming member further includes a throttle portion disposed on the second side in the reference direction with respect to the first oil passage. 5.
The oil path forming member is further disposed on the second side in the reference direction than the throttle section, and further includes a third oil path communicating with the first oil path via the throttle section,
5. The drive transmission device for a vehicle according to claim 4, wherein a sectional area of the oil passage is smaller as the description order is later in the order of the first oil passage, the third oil passage, and the throttle portion.
The case includes an engaged portion with which the oil passage forming member is engaged,
The drive transmission device for a vehicle according to any one of claims 1 to 5, wherein the oil passage forming member includes an engaging portion that engages with the engaged portion.
The vehicle drive transmission device according to any one of claims 1 to 6, wherein the elastic member is formed in a tubular shape.
The oil passage forming member has a cylindrical main body in which the first oil passage is formed on the second side in the reference direction with respect to the holding portion,
The inner diameter of the holding portion is larger than the inner diameter of the first oil passage,
The vehicle drive according to any one of claims 1 to 7, wherein the step surface is formed so as to connect the inner peripheral surface of the holding portion and the inner peripheral surface of the first oil passage. Transmission device.
The vehicle drive transmission device according to any one of claims 1 to 8, wherein an inner diameter of the second oil passage is larger than an inner diameter of the opening and an inner diameter of the first oil passage.
An oil passage forming unit including an oil passage forming member and an elastic member,
A first oil passage provided along a reference direction, a holding portion formed at an end of a first reference direction side, which is one side of the reference direction, for holding the elastic member; , And
A side opposite to the first side in the reference direction is defined as a second side in the reference direction.
The holding portion has a cylindrical inner peripheral surface, and a step surface provided on the second side in the reference direction from the inner peripheral surface and facing the first side in the reference direction,
The elastic member has a second oil passage that is provided along the reference direction and communicates with the first oil passage, and is disposed so as to abut against the inner peripheral surface from the radial inside.
An oil passage forming unit, wherein a length of the elastic member in the reference direction is longer than a length in the reference direction from the step surface to an end of the holding portion on the first side in the reference direction.