CN111532121B - Drive transmission device for vehicle - Google Patents

Abstract

The present invention provides a vehicle drive transmission device capable of controlling gear noise to be relatively small. The vehicle drive transmission device (100) comprises a gear mechanism (1) disposed in a power transmission path connecting a driving force source (MG) and a pair of wheels; a housing (2) having a first storage portion for storing oil and accommodating the gear mechanism (1); and a storage portion constituent component (6) disposed above the first storage portion and constituting a second storage portion for storing oil. The gear mechanism (1) comprises: a gear (32, 42, 43); an axis component (31, 41) connected to the gear; and bearings (91, 92, 93, 94) supporting the axis component (31, 41) to be rotatable relative to the housing (2). The housing comprises a bearing support portion (24) for supporting the bearing. The storage portion constituent component comprises a first contact portion (61) contacting the bearing support portion (24) via a first elastic component (71) having elasticity.

Description

Vehicle drive transmission device

Technical Field

The present invention relates to a vehicle drive transmission device for transmitting drive force between a drive force source and a pair of wheels.

Background Art

An example of such a vehicle drive transmission device is disclosed in Patent Document 1 listed below. In the following description of the background art, the reference numerals of Patent Document 1 are cited.

In the vehicle drive transmission device of Patent Document 1, a first reservoir 70 for storing oil and a second reservoir 80 for storing oil are formed inside a housing 40 that accommodates a gear mechanism. The second reservoir 80 functions as a collection box for storing oil in order to lower the oil level of the first reservoir 70.

In the vehicle drive transmission device of Patent Document 1, the oil level of the first reservoir 70 is lowered by the second reservoir 80 to reduce the stirring resistance of the oil caused by various rotating components.

Patent Document 1: Japanese Patent Application Publication No. 2018-57243

However, in the vehicle drive transmission device of Patent Document 1, a plurality of shaft members are rotatably supported by a plurality of bearings B supported by a housing 40. Therefore, vibrations generated in meshing portions of gears connected to the shaft members are transmitted to the housing 40 via the bearings B, and there is a problem that large gear noise is easily generated.

Therefore, it is desired to realize a vehicle drive transmission device capable of suppressing gear noise to be small.

Summary of the invention

In view of the above circumstances, the characteristic structure of the vehicle drive transmission device is as follows.

A vehicle drive transmission device for transmitting driving force between a driving force source and a pair of wheels, comprising: a gear mechanism, which is arranged in a power transmission path connecting the above-mentioned driving force source and the pair of wheels; a housing, which has a first storage portion for storing oil and accommodates the above-mentioned gear mechanism; and a storage portion constituent component, which is arranged above the above-mentioned first storage portion and constitutes a second storage portion for storing oil, the above-mentioned gear mechanism comprising: a gear, a shaft component connected to the above-mentioned gear, and a bearing that supports the above-mentioned shaft component to be rotatable relative to the above-mentioned housing, the above-mentioned housing has a bearing support portion that supports the above-mentioned bearing, and the above-mentioned storage portion constituent component has a first abutment portion that abuts against the above-mentioned bearing support portion via a first elastic component having elasticity.

According to this characteristic structure, a first elastic member having elasticity is sandwiched between the first abutment portion of the storage portion component and the bearing support portion of the housing. Thus, the first elastic member can be used to attenuate the vibration generated in the meshing portion of the gear and transmitted to the bearing support portion via the shaft member and the bearing. Moreover, the oil stored in the second storage portion can be used to attenuate the vibration transmitted to the storage portion component via the first elastic member. As a result, the vibration of the entire housing can be suppressed to a small value, and the gear noise can be controlled to a small value.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view along the axial direction of a vehicle drive transmission device according to an embodiment.

2 is a cross-sectional view perpendicular to the axial direction, showing a main portion of the vehicle drive transmission device according to the embodiment.

3 is a cross-sectional view along the axial direction showing a main part of the vehicle drive transmission device according to the embodiment.

Description of Reference Numerals

100: a vehicle drive transmission device; 1: a gear mechanism; 2: a housing; 24: a bearing support portion; 3: an input member; 31: an input shaft (shaft member); 32: an input gear (gear); 4: a secondary gear mechanism; 41: a secondary shaft (shaft member); 42: a first gear (gear); 43: a second gear (gear); 5: a differential gear device; 6: a storage portion component; 61: a first abutment portion; 71: a first elastic member; 91: a first input bearing (bearing); 92: a second input bearing (bearing); 93: a first secondary bearing (bearing); 94: a second secondary bearing (bearing); 10A: a first storage portion; 10B: a second storage portion; MG: a rotating motor (driving force source); F: oil; L: axial direction; R: radial direction.

DETAILED DESCRIPTION

The vehicle drive transmission device 100 according to the embodiment will be described below with reference to the drawings. The vehicle drive transmission device 100 is mounted on, for example, a hybrid vehicle using an internal combustion engine and a rotating electric machine as a driving force source for multiple wheels, or an electric vehicle using a rotating electric machine as a driving force source for multiple wheels.

As shown in FIG1 , a vehicle drive transmission device 100 transmits drive force between a drive force source and a pair of wheels. In the present embodiment, the rotary electric machine MG functions as a drive force source. In addition, in the present specification, the term "rotary electric machine" is used as a concept including a motor (electric motor), a generator (generator), and a motor/generator that realizes the functions of both a motor and a generator as required.

The vehicle drive transmission device 100 includes a gear mechanism 1 provided in a power transmission path connecting a driving force source and a pair of wheels, and a housing 2 that accommodates the gear mechanism 1 .

In the present embodiment, the gear mechanism 1 includes: an input member 3 drivingly connected to a driving force source, a sub-gear mechanism 4, and a differential gear device 5 for distributing the driving force transmitted from the driving force source side to a pair of wheels. The input member 3 is arranged on the first axis A1 as its rotation axis. In the present embodiment, the rotary electric machine MG drivingly connected to the input member 3 is also arranged on the first axis A1. In addition, the sub-gear mechanism 4 is arranged on the second axis A2 as its rotation axis, and the differential gear device 5 is arranged on the third axis A3 as its rotation axis. The first axis A1, the second axis A2, and the third axis A3 are different virtual axes and are arranged parallel to each other.

In the following description, the direction parallel to the above-mentioned axes A1 to A3 is referred to as the "axial direction L" of the vehicle drive transmission device 100. Moreover, in the axial direction L, the side where the rotary electric machine MG is arranged relative to the input member 3 is referred to as the "axial first side L1", and the opposite side is referred to as the "axial second side L2". In addition, the direction orthogonal to each of the above-mentioned first axis A1, second axis A2, and third axis A3 is referred to as the "radial direction R" with respect to each axis as a reference. In addition, when it is not necessary to distinguish which axis is used as a reference, or when it is clear which axis is used as a reference, it may be simply described as "radial direction R".

Here, in the present application, "drive connection" refers to a state in which two rotating members are connected in a manner that can transmit driving force, including: a state in which the two rotating members are connected in a manner that rotates as a whole, or a state in which the two rotating members are connected in a manner that can transmit driving force via one or more transmission components. Such transmission components include various components that transmit rotation at the same speed or at a variable speed, such as shafts, gear mechanisms, belts, chains, etc. In addition, transmission components may also include engaging devices that selectively transmit rotation and driving force, such as friction engaging devices, meshing engaging devices, etc. However, in the differential gear device 5, when it is referred to as "drive connection" for each rotating member, it refers to a state that is related to more than three rotating members possessed by the device and is drive-connected to each other without passing through other rotating members.

The rotary electric machine MG includes a stator St and a rotor Ro arranged radially inwardly R2 relative to the stator St. The stator St includes a stator core Stc supported by a housing 2 and a coil C wound around the stator core Stc. The rotor Ro includes a rotor core Roc rotatable relative to the stator core Stc and a permanent magnet M arranged in the rotor core Roc. In the present embodiment, the rotor core Roc is arranged radially inwardly R relative to the stator core Stc. Furthermore, the rotor shaft Ros is connected to the inner circumferential surface of the rotor core Roc.

The rotor shaft Ros is formed in a cylindrical shape extending in the axial direction L. The rotor shaft Ros rotates integrally with the rotor Ro about the first axis A1. The rotor shaft Ros is coupled to the input member 3 and rotates integrally with the input member 3.

In the present embodiment, the housing 2 has a peripheral wall portion 21 surrounding the outer side of the radial direction R of the rotary electric machine MG, the input member 3, the sub-gear mechanism 4, and the differential gear device 5. In addition, in the present embodiment, the housing 2 has a first side wall portion 22 and a second side wall portion 23 extending along the radial direction R. The first side wall portion 22 is arranged between the input member 3 and the sub-gear mechanism 4 and the rotary electric machine MG in the axial direction L. The second side wall portion 23 is arranged on the second axial side L2 relative to the input member 3 and the sub-gear mechanism 4.

In the present embodiment, the peripheral wall portion 21 includes: a first peripheral wall portion 211, and a second peripheral wall portion 212 joined to the first peripheral wall portion 211 from the second axial side L2. In the example shown in the figure, the first peripheral wall portion 211 and the first side wall portion 22 are formed integrally, and the second peripheral wall portion 212 and the second side wall portion 23 are formed integrally. That is, the housing 2 includes: a first housing portion having the first peripheral wall portion 211 and the first side wall portion 22, and a second housing portion having the second peripheral wall portion 212 and the second side wall portion 23. Moreover, the first housing portion and the second housing portion are connected to each other by the first peripheral wall portion 211 and the second peripheral wall portion 212 using a connecting member such as a bolt.

In addition, the housing 2 has a bearing support portion 24 that supports the bearing of the gear mechanism 1. In the present embodiment, the bearing support portion 24 includes a first bearing support portion 24A that supports the first input bearing 91 and the first auxiliary bearing 93, and a second bearing support portion 24B that supports the second input bearing 92 and the second auxiliary bearing 94. The first bearing support portion 24A is formed on the first side wall portion 22, and the second bearing support portion 24B is formed on the second side wall portion 23. The first input bearing 91 and the second input bearing 92 are bearings that support the input member 3 so that it can rotate. The first auxiliary bearing 93 and the second auxiliary bearing 94 are bearings that support the auxiliary gear mechanism 4 so that it can rotate.

The input member 3 is an input component of the gear mechanism 1 . The input member 3 includes an input shaft 31 and an input gear 32 .

The input shaft 31 is a shaft member extending in the axial direction L. In the present embodiment, the end portion of the input shaft 31 on the axial first side L1 is connected to the end portion of the rotor shaft Ros on the axial second side L2. In the illustrated example, the end portion of the input shaft 31 on the axial first side L1 is inserted into the end portion of the axial second side L2 of the rotor shaft Ros so that the input shaft 31 is located on the inner side in the radial direction R of the rotor shaft Ros, and the ends are connected to each other by spline engagement.

The input shaft 31 is rotatably supported by the housing 2 via the first input bearing 91 and the second input bearing 92. In the present embodiment, a portion of the input shaft 31 that is closer to the first axial side L1 than the center portion in the axial direction L and closer to the second axial side L2 than the connection portion with the rotor shaft Ros is rotatably supported by the first bearing support portion 24A of the housing 2 via the first input bearing 91. Furthermore, an end portion of the input shaft 31 on the second axial side L2 is rotatably supported by the second bearing support portion 24B of the housing 2 via the second input bearing 92.

The input gear 32 is a gear that transmits the driving force from the driving force source to the sub-gear mechanism 4. The input gear 32 is connected to the input shaft 31. In the present embodiment, the input gear 32 is formed integrally with the input shaft 31. In addition, in the present embodiment, the input gear 32 is arranged between the first input bearing 91 and the second input bearing 92. In the example shown in the figure, the input gear 32 is arranged adjacent to the axial first side L1 with respect to the second input bearing 92.

In the present embodiment, a parking gear 33 is provided on the input shaft 31. The parking gear 33 is configured to be switchable between a locked state in which the parking gear 33 cannot rotate and an unlocked state in which the parking gear 33 can rotate by a parking lock mechanism (not shown). The parking gear 33 is connected to the input shaft 31 in such a manner that the parking gear 33 rotates integrally with the input shaft 31. In the present embodiment, the parking gear 33 is connected to the input shaft 31 by spline engagement.

The counter gear mechanism 4 is disposed between the input member 3 and the differential gear device 5 in the power transmission path. The counter gear mechanism 4 includes a counter shaft 41, a first gear 42, and a second gear 43.

The auxiliary shaft 41 is a shaft member extending in the axial direction L. The auxiliary shaft 41 is rotatably supported by the housing 2 via the first auxiliary bearing 93 and the second auxiliary bearing 94. In the present embodiment, the end portion of the auxiliary shaft 41 on the axial first side L1 is rotatably supported by the first bearing support portion 24A of the housing 2 via the first auxiliary bearing 93, and the end portion of the auxiliary shaft 41 on the axial second side L2 is rotatably supported by the second bearing support portion 24B of the housing 2 via the second auxiliary bearing 94.

The first gear 42 is an input member of the sub-gear mechanism 4. The first gear 42 meshes with the input gear 32 of the input member 3. The first gear 42 is connected to the sub-shaft 41 in a manner that it rotates integrally with the sub-shaft 41. In the present embodiment, the first gear 42 is connected to the sub-shaft 41 by spline engagement. In addition, in the present embodiment, the first gear 42 is arranged between the first sub-bearing 93 and the second sub-bearing 94 and is closer to the axial second side L2 than the second gear 43. In the example shown in the figure, the first gear 42 is arranged to be adjacent to the axial first side L1 relative to the second sub-bearing 94, and to be adjacent to the axial second side L2 relative to the second gear 43.

The second gear 43 is an output member of the sub-gear mechanism 4. In the present embodiment, the second gear 43 is formed to have a smaller diameter than the first gear 42. The second gear 43 is connected to the sub-shaft 41 in such a manner that it rotates integrally with the sub-shaft 41. In the present embodiment, the second gear 43 is formed integrally with the sub-shaft 41. In addition, in the present embodiment, the second gear 43 is arranged between the first sub-bearing 93 and the second sub-bearing 94 and is closer to the axial first side L1 than the first gear 42. In the illustrated example, the second gear 43 is arranged to be adjacent to the axial second side L2 relative to the first sub-bearing 93, and to be adjacent to the axial first side L1 relative to the first gear 42.

The differential gear device 5 distributes the driving force transmitted from the driving force source side to a pair of wheels. In the present embodiment, the differential gear device 5 distributes the driving force from the rotary electric machine MG transmitted via the input member 3 and the pinion mechanism 4 to the drive shaft DS connected to each drive of the pair of wheels. The differential gear device 5 includes: a differential input gear 51, a differential case 52, a pinion shaft 53, a pair of pinion gears 54, and a pair of side gears 55. In the present embodiment, the pair of pinion gears 54 and the pair of side gears 55 are both bevel gears.

The differential input gear 51 is an input member of the differential gear device 5. The differential input gear 51 meshes with the second gear 43 of the pinion mechanism 4. The differential input gear 51 rotates around the third axis A3. The differential input gear 51 is connected to the differential case 52 so as to rotate integrally with the differential case 52.

The differential case 52 rotates integrally with the differential input gear 51 about the third axis A3. The end of the axial first side L1 of the differential case 52 is supported to be rotatable relative to the case 2 via the first differential bearing 95. The end of the axial second side L2 of the differential case 52 is supported to be rotatable relative to the case 2 via the second differential bearing 96. The differential case 52 is a hollow component. A pinion shaft 53, a pair of pinion gears 54, and a pair of side gears 55 are housed inside the differential case 52.

The pinion shaft 53 extends along the radial direction R based on the third axis A3. The pinion shaft 53 is inserted through a pair of pinion gears 54 and supported so as to be rotatable. The pinion shaft 53 is configured to penetrate the differential case 52. The pinion shaft 53 is locked to the differential case 52 by a locking member 53a and rotates integrally with the differential case 52. In the example shown in the figure, the locking member 53a is a rod-shaped pin inserted through both the differential case 52 and the pinion shaft 53.

The pair of pinion gears 54 are mounted on the pinion shaft 53 in a state of being opposed to each other at a distance along the radial direction R based on the third axis A3. The pair of pinion gears 54 are configured to be rotatable (autorotational) about the pinion shaft 53 and rotatable (revolutional) about the third axis A3.

A pair of side gears 55 are distributed rotating members in the differential gear device 5. The pair of side gears 55 are arranged to be opposed to each other with a gap between the pinion shaft 53 in the axial direction L. The pair of side gears 55 are respectively configured to rotate in the circumferential direction. The pair of side gears 55 mesh with the pair of pinion gears 54. In the present embodiment, a spline for connecting the drive shaft DS is formed on the inner circumferential surface of each side gear 55.

As shown in FIG. 2 , a first reservoir 10A for storing the oil F and a second reservoir 10B for storing the oil F, which is arranged above the first reservoir 10A, are provided inside the housing 2 .

In the present embodiment, the first reservoir 10A is a space enclosed by the inner surface of the housing 2 at the lower part of the housing 2. The first reservoir 10A stores an amount of oil F that can be lifted by the differential input gear 51 of the differential gear device 5. That is, the oil level of the oil F stored in the first reservoir 10A during the operation of the differential gear device 5 (while the vehicle is running) is set to be higher than the lower end of the differential input gear 51. In addition, the oil level of the oil F stored in the first reservoir 10A during the stop of the differential gear device 5 (while the vehicle is parked) is used for lubrication of the output seal member 73 sandwiched between the housing 2 and the drive shaft DS, so it is preferably set to be higher than the upper end of the output seal member 73.

The second storage portion 10B functions as a collection box for ensuring a sufficient amount of oil F in the housing 2 and for lowering the oil level of the oil F stored in the first storage portion 10A. That is, the greater the amount of oil F stored in the second storage portion 10B, the lower the oil level of the oil F stored in the first storage portion 10A. In the present embodiment, the second storage portion 10B is arranged on the upper side with respect to the first axis A1, the second axis A2, and the third axis A3.

As shown in Fig. 3 , the second storage section 10B is configured using the storage section configuration member 6. The storage section configuration member 6 has a first contact portion 61 that contacts the bearing support portion 24 of the housing 2 via a first elastic member 71 having elasticity.

In the present embodiment, the first bearing support portion 24A has a protrusion 241 protruding in the axial direction L in a manner that supports each of the first input bearing 91 and the first auxiliary bearing 93 from the outer side of the radial direction R. In the present embodiment, the protrusion 241 is formed to protrude from the first side wall portion 22 to the second axial side L2. Moreover, the first abutment portion 61 of the storage portion constituent member 6 abuts against the protrusion 241 via the first elastic member 71 from the second axial side L2. The first elastic member 71 is formed using a material having elasticity such as resin. In the present embodiment, the first elastic member 71 is a sealing member that blocks the gap between the storage portion constituent member 6 and the bearing support portion 24 (here, the protrusion 241 of the first bearing support portion 24A). Therefore, in the present embodiment, at least a portion of the second storage portion 10B is formed between the storage portion constituent member 6 and the housing 2.

In the present embodiment, the second side wall portion 23 of the housing 2 is arranged on the side opposite to the first bearing support portion 24A in the axial direction L (the second axial side L2) relative to the storage portion constituent component 6. Furthermore, the storage portion constituent component 6 has a second abutting portion 62, which abuts against the second side wall portion 23 via a second elastic component 72 having elasticity. In the present embodiment, the second abutting portion 62 is formed to protrude from the storage side wall portion 63 of the storage portion constituent component 6 toward the second axial side L2. The second elastic component 72 is formed using an elastic material such as resin. The storage side wall portion 63 is formed to extend upward from the end of the axial second side L2 of the storage bottom wall portion 64 that becomes the bottom of the storage portion constituent component 6. In the present embodiment, the first abutting portion 61 is arranged at the end of the axial first side L1 of the storage bottom wall portion 64.

In the present embodiment, the second abutting portion 62 abuts against the oil path forming portion 25 of the housing 2 via the second elastic member 72. The oil path forming portion 25 is a portion of the housing 2 that forms a connecting oil path 25a through which the oil F flows. In the present embodiment, the oil path forming portion 25 is formed to protrude from the second side wall portion 23 toward the axial first side L1.

In the present embodiment, the second abutting portion 62 is formed into a cylindrical shape extending in the axial direction L, and is configured so that the oil F can flow inside the second abutting portion 62. Moreover, the second abutting portion 62 connects the connecting oil path 25a formed in the oil path forming portion 25 and the second storage portion 10B. In the present embodiment, the second elastic member 72 is a sealing member that blocks the gap between the storage portion constituent member 6 and the oil path forming portion 25. In addition, in the present embodiment, the second elastic member 72 is formed into a cylindrical shape extending in the axial direction L. Moreover, the second elastic member 72 is inserted into the second abutting portion 62 from the axial second side L2 in a manner of being located on the inner side of the radial direction R of the second abutting portion 62.

Thus, in the present embodiment, the first contact portion 61 contacts the protrusion 241 from the second axial side L2 via the first elastic member 71, and the second contact portion 62 contacts the second side wall portion 23 (here, the oil passage forming portion 25) from the first axial side L1 via the second elastic member 72. Thus, the reservoir component 6 is supported by the housing 2 in the axial direction L.

In the present embodiment, the storage portion constituting component 6 has a partition wall portion 65 extending upward from the first abutment portion 61. The partition wall portion 65 divides the second storage portion 10B into a first oil chamber 10Ba and a second oil chamber 10Bb. That is, the partition wall portion 65 is in contact with both the oil F stored in the first oil chamber 10Ba and the oil F stored in the second oil chamber 10Bb. The first oil chamber 10Ba is a portion of the second storage portion 10B on the side opposite to the side of the first bearing support portion 24A in the axial direction L (the second axial side L2) with respect to the partition wall portion 65. The second oil chamber 10Bb is a portion of the second storage portion 10B on the side opposite to the first bearing support portion 24A in the axial direction L (the first axial side L1) with respect to the partition wall portion 65.

In the present embodiment, the storage portion constituent component 6 is constituted as a container formed as a wall portion including a storage side wall portion 63 and a partition wall portion 65 rising from the outer edge portion of the storage bottom wall portion 64. That is, the storage portion constituent component 6 is a container with an opening on the top. Therefore, in the present embodiment, the internal space of the storage portion constituent component 6 functions as the first oil chamber 10Ba. On the other hand, the space surrounded by the partition wall portion 65 and the first side wall portion 22 and the protrusion portion 241 of the housing 2 functions as the second oil chamber 10Bb. That is, the second oil chamber 10Bb is constituted using the partition wall portion 65 and the bearing support portion 24. As described above, since the first elastic component 71 as a sealing component is sandwiched between the first abutting portion 61 of the storage portion constituent component 6 and the protrusion portion 241 of the housing 2, the oil F stored in the second oil chamber 10Bb is suppressed from flowing out from there between.

In the present embodiment, a connecting hole 65a connecting the first oil chamber 10Ba and the second oil chamber 10Bb is formed in the dividing wall portion 65. In addition, in the present embodiment, a first supply hole 64a and a second supply hole 64b are formed in the storage bottom wall portion 64. The first supply hole 64a is arranged at a position overlapping with the input gear 32 of the input member 3 when viewed from the vertical direction. The second supply hole 64b is arranged at a position overlapping with the parking gear 33 when viewed from the vertical direction. As a result, the oil F flowing out from the first oil chamber 10Ba through the first supply hole 64a falls and is supplied to the input gear 32. In addition, the oil F flowing out from the first oil chamber 10Ba through the second supply hole 64b falls and is supplied to the parking gear 33.

Here, regarding the arrangement of two components, "overlapping when viewed from a specific direction" means that when an imaginary straight line parallel to the viewing direction is moved in directions orthogonal to the imaginary straight line, there is at least a partial area where the imaginary straight line intersects both components.

The oil F circulates inside the housing 2 through the oil circulation mechanism. In the present embodiment, the differential input gear 51 of the differential gear device 5 functions as an oil circulation mechanism. As described above, the differential input gear 51 rotates, and the oil F stored in the first storage portion 10A is lifted up by the differential input gear 51 (see FIG. 2 ). After the oil F is lifted up to the top of the first storage portion 10A by the differential input gear 51, it falls to the first storage portion 10A, and the oil F is supplied to the first storage portion 10A.

In addition, as shown in FIG. 1 , in the present embodiment, a hydraulic pump 8 is provided as another oil circulation mechanism. The hydraulic pump 8 is a mechanical hydraulic pump driven by a driving force transmitted in a power transmission path. In the present embodiment, the hydraulic pump 8 has a pump drive shaft 81 connected in a manner to rotate integrally with the secondary shaft 41 of the secondary gear mechanism 4. The pump drive shaft 81 extends in the axial direction L. In the present embodiment, the end of the pump drive shaft 81 on the axial first side L1 is connected to the end of the axial second side L2 of the secondary shaft 41. In the illustrated example, in a state where the pump drive shaft 81 is arranged on the inner side of the radial direction R of the secondary shaft 41 formed in a cylindrical shape, they are connected to each other by spline engagement. The pump drive shaft 81 rotates along with the rotation of the secondary shaft 41, thereby driving the hydraulic pump 8.

The hydraulic pump 8 draws the oil F stored in the first storage portion 10A, and supplies the drawn oil F to various parts in the housing 2. In the present embodiment, a part of the oil F discharged from the hydraulic pump 8 flows to the countershaft oil passage 41a formed in a manner penetrating the countershaft 41 in the axial direction L through the oil passage formed in a manner penetrating the pump drive shaft 81 in the axial direction L. Then, the oil F that has passed through the countershaft oil passage 41a flows out from the opening of the end surface on the axial first side L1 of the countershaft 41. Then, the oil F that has flowed out from the countershaft oil passage 41a lubricates the first countershaft bearing 93, the differential gear device 5, and the like, and then reaches the first storage portion 10A.

On the other hand, as shown in Fig. 1 and Fig. 3, the other part of the oil F discharged from the hydraulic pump 8 flows into the side wall inner oil passage 23a formed inside the second side wall portion 23 of the housing 2. The oil F flowing into the side wall inner oil passage 23a flows into the internal space of the housing 2 through each of the first branch oil passage 23b and the second branch oil passage 23c branched from the side wall inner oil passage 23a and the connecting oil passage 25a.

The oil F that has passed through the first branch oil passage 23b lubricates the second auxiliary bearing 94, the first gear 42 of the auxiliary gear mechanism 4, the second differential bearing 96, etc., and then reaches the first storage portion 10A. The oil F that has passed through the second branch oil passage 23c flows to the input shaft oil passage 31a formed so as to penetrate the input shaft 31 of the input member 3 in the axial direction L. The oil F that has flowed to the input shaft oil passage 31a is supplied to each part of the rotary electric machine MG through the oil passage formed on the rotor shaft Ros. As shown in FIG. 3 , the oil F that has passed through the connecting oil passage 25a is supplied to the first oil chamber 10Ba of the second storage portion 10B via the second abutment portion 62. In addition, the oil F that has been supplied to the first oil chamber 10Ba is also supplied to the second oil chamber 10Bb through the connecting hole 65a of the partition wall portion 65.

The oil F stored in the first oil chamber 10Ba is supplied to the input gear 32 of the input member 3 through the first supply hole 64a, and is supplied to the parking gear 33 through the second supply hole 64b. Then, the oil F supplied to each of the input gear 32 and the parking gear 33 lubricates the pinion gear mechanism 4 and the like and reaches the second differential bearing 96. Then, the oil F that has lubricated the second differential bearing 96 flows to the first reservoir 10A.

As described above, in the present embodiment, the first supply path P1 for supplying the oil F stored in the first oil chamber 10Ba to the input member 3 , the pinion mechanism 4 , and the second differential bearing 96 is provided inside the case 2 .

On the other hand, as shown in Fig. 2 and Fig. 3, the oil F stored in the second oil chamber 10Bb is supplied to the first differential bearing 95 through the case oil passage 2a formed in the case 2 so as to communicate with the second oil chamber 10Bb. Thus, in the present embodiment, a second supply passage P2 for supplying the oil F stored in the second oil chamber 10Bb to the first differential bearing 95 is further provided inside the case 2.

[Other implementation methods]

(1) In the above embodiment, the configuration in which the first abutting portion 61 of the storage portion component 6 abuts against the first bearing support portion 24A (protrusion 241) of the housing 2 is described as an example. However, the configuration is not limited to such a configuration, and the first abutting portion 61 may abut against the second bearing support portion 24B instead of the first bearing support portion 24A. In addition, in the above embodiment, the configuration in which the first bearing support portion 24A abutted by the first abutting portion 61 supports both the first input bearing 91 and the first auxiliary bearing 93 is described as an example. However, the configuration is not limited to such a configuration, and the bearing support portion 24 abutted by the first abutting portion 61 may only support one of the input bearings 91, 92 supporting the input shaft 31 and the auxiliary bearings 93, 94 supporting the auxiliary gear mechanism 4.

(2) In the above embodiment, although the configuration in which the first contact portion 61 contacts the first bearing support portion 24A (protrusion 241) from the second axial side L2 is described as an example, the configuration is not limited to such a configuration, and for example, the first contact portion 61 may contact the first bearing support portion 24A from above.

(3) In the above embodiment, the storage portion component 6 has the second contact portion 62 that contacts the oil passage forming portion 25 via the second elastic member 72. However, the present invention is not limited to such a configuration, and the second contact portion 62 may contact the second bearing support portion 24B via the second elastic member 72, or may contact a portion other than the second bearing support portion 24B and the oil passage forming portion 25 of the second side wall portion 23.

(4) Although the first elastic member 71 is described as a sealing member that blocks the gap between the first contact portion 61 of the reservoir component 6 and the protrusion 241 of the bearing support portion 24, the present invention is not limited to such a configuration, and the first elastic member 71 may not have the function of blocking the gap between the first contact portion 61 and the protrusion 241. In this case, the second oil chamber 10Bb is not formed between the partition wall portion 65, the first side wall portion 22, and the protrusion 241.

(5) In the above embodiment, the storage portion component 6 has a structure including the partition wall portion 65 extending upward from the first contact portion 61. However, the structure is not limited to this structure, and the storage portion component 6 may not have the partition wall portion 65. In addition, the partition wall portion 65 may be formed to extend upward from the storage bottom wall portion 64.

(6) In the above embodiment, the gear mechanism 1 includes the input member 3, the pinion mechanism 4, and the differential gear device 5. However, the present invention is not limited to this structure, and various structures can be applied.

(7) In the above embodiment, the oil F stored in the first storage portion 10A is lifted up by the differential input gear 51 of the differential gear device 5 and supplied to the second storage portion 10B. However, the present invention is not limited to such a configuration, and the oil F stored in the first storage portion 10A may be lifted up by the differential input gear 51 and not supplied to the second storage portion 10B. In such a configuration, the upper portion of the second storage portion 10B may be closed.

(8) In the above embodiment, the configuration in which the oil F is supplied to the second storage section 10B by the hydraulic pump 8 is described as an example. However, the configuration is not limited to this configuration, and a configuration without the hydraulic pump 8 may be used. In such a configuration, it is preferred that the second abutment portion 62 is not provided on the storage section component 6, and the storage section component 6 is connected to the housing 2 by a connecting member such as a bolt. In this case, the oil F lifted up by the differential input gear 51 is supplied to the second storage section 10B.

(9) In the above embodiment, the second gear 43 of the pinion mechanism 4 is described as having a smaller diameter than the first gear 42. However, the present invention is not limited to this configuration, and the second gear 43 may be larger in diameter than the first gear 42, or have the same diameter as the first gear 42.

(10) In addition, the configurations disclosed in the above-mentioned embodiments can be combined with the configurations disclosed in other embodiments for application as long as no contradiction occurs. With regard to other configurations, the embodiments disclosed in this specification are merely illustrative in all aspects. Therefore, various changes can be appropriately made without departing from the scope of the purpose of the present invention.

[Overview of the above-mentioned embodiment]

Hereinafter, the outline of the vehicle drive transmission device 100 described above will be described.

Technical Solution 1

The vehicle drive transmission device 100 is a vehicle drive transmission device 100 that transmits drive force between a drive power source MG and a pair of wheels, and includes: a gear mechanism 1 provided in a power transmission path connecting the drive power source MG and the pair of wheels; a housing 2 having a first reservoir 10A for storing oil F and accommodating the gear mechanism 1; and a reservoir component 6 that is arranged above the first reservoir 10A and constitutes a second reservoir 10B for storing oil F. The gear mechanism 1 includes gears 32, 42, 43, shaft members 31, 41 connected to the gears 32, 42, 43, and bearings 91, 92, 93, 94 that support the shaft members 31, 41 to be rotatable relative to the housing 2, the housing 2 includes a bearing support portion 24 that supports the bearings 91, 92, 93, 94, and the reservoir component 6 includes a first contact portion 61 that contacts the bearing support portion 24 via a first elastic member 71 having elasticity.

According to this structure, the first elastic member 71 having elasticity is interposed between the first contact portion 61 of the storage portion component 6 and the bearing support portion 24 of the housing 2. Thus, the vibration generated in the meshing portion of the gears 32, 42, 43 and transmitted to the bearing support portion 24 via the shaft members 31, 41 and the bearings 91, 92, 93, 94 can be attenuated by the first elastic member 71. Furthermore, the vibration transmitted to the storage portion component 6 via the first elastic member 71 can be attenuated by the oil F stored in the second storage portion 10B. As a result, the vibration of the housing 2 as a whole can be suppressed to be small and the gear noise can be suppressed to be small.

Technical Solution 2

Here, it is preferred that the housing 2 has a first side wall portion 22 extending along the radial direction R, and the bearing support portion 24 has: a protrusion 241 protruding from the first side wall portion 22 toward the axial direction L in a manner that supports the bearings 91, 92, 93, 94 from the outer side of the radial direction R, and the first abutment portion 61 abuts against the protrusion 241 via the first elastic component 71.

According to this structure, it is easy to make the first contact portion 61 of the storage portion component 6 contact the bearing support portion 24 of the housing 2 at a position relatively close to the bearings 91, 92, 93, 94. As a result, the distance from the meshing portion of the gears 32, 42, 43 to the first elastic member 71 in the vibration transmission path can be suppressed to be short. In other words, the first elastic member 71 can be arranged at a position relatively close to the meshing portion of the gears 32, 42, 43 that is the source of vibration. As a result, the vibration generated at the meshing portion of the gears 32, 42, 43 can be attenuated at a relatively close position, and the vibration can be difficult to be transmitted to the entire housing 2. Therefore, the gear noise can be suppressed to be smaller.

Technical Solution 3

In addition, it is preferred that the above-mentioned shell 2 has a second side wall portion 23 extending along the radial direction R, and the above-mentioned second side wall portion 23 is arranged on the side opposite to the side of the above-mentioned bearing support portion 24 in the axial direction L (axial second side L2) relative to the above-mentioned storage portion constituting component 6, and the above-mentioned storage portion constituting component 6 has a second abutting portion 62 abutting against the above-mentioned second side wall portion 23 via a second elastic component 72 having elasticity.

According to this structure, the first contact portion 61 contacts the bearing support portion 24 via the first elastic member 71, and the second contact portion 62 contacts the second side wall portion 23 via the second elastic member 72. That is, the storage portion component 6 is supported by the housing 2 via the elastic members 71 and 72 on both sides in the axial direction L. Thus, the function of suppressing the vibration of the housing 2 as a whole to be small can be ensured, and the storage portion component 6 can be appropriately supported with a simple structure.

Technical Solution 4

In addition, the first elastic member 71 is a sealing member that blocks the gap between the storage portion constituent member 6 and the bearing support portion 24. The storage portion constituent member 6 has a dividing wall portion 65 extending upward from the first abutment portion 61. The dividing wall portion 65 divides the second storage portion 10B into: a first oil chamber 10Ba located on the side opposite to the side of the bearing support portion 24 in the axial direction L relative to the dividing wall portion 65 (the second axial side L2); and a second oil chamber 10Bb located on the side of the bearing support portion 24 in the axial direction L relative to the dividing wall portion 65 (the first axial side L1).

According to this structure, the contact portion 61 of the storage portion constituent member 6 contacts the bearing support portion 24 of the housing 2 via the first elastic member 71, which is a sealing member that blocks the gap between the storage portion constituent member 6 and the bearing support portion 24. Thus, in order to constitute the second storage portion 10B, the portion of the housing 2 including the bearing support portion 24 can be used. Therefore, compared with the case where the storage portion constituent member 6 alone constitutes the second storage portion 10B, it is easy to ensure a larger volume of the second storage portion 10B.

Furthermore, according to this configuration, the rigidity of the storage section constituent member 6 can be improved by the partition wall portion 65 .

Moreover, according to this structure, the vibration transmitted to the storage section component 6 can be transmitted to the oil F stored in each oil chamber 10Ba, 10Bb by using the wall portion 65 formed in a manner of dividing the first oil chamber 10Ba and the second oil chamber 10Bb. That is, the vibration transmitted to the storage section component 6 can be efficiently transmitted to the oil F stored in the second storage section 10B via the dividing wall portion 65. As a result, the attenuation effect of the vibration generated by the oil F stored in the second storage section 10B can be improved. Therefore, the gear noise can be suppressed to a smaller level.

Technical Solution 5

In a configuration in which the first elastic member 71 is the sealing member and the reservoir component member 6 has the partition wall portion 65 , it is preferable that the second oil chamber 10Bb is configured using the partition wall portion 65 and the bearing support portion 24 .

According to this structure, the second oil chamber 10Bb can be appropriately formed by utilizing the space surrounded by at least the partition wall portion 65 and the bearing support portion 24. Thus, compared with the case where the storage portion constituting member 6 constitutes the second storage portion 10B alone, the volume of the second storage portion 10B can be ensured to be larger with the volume of the second oil chamber 10Bb.

Technical Solution 6

In addition, the gear mechanism 1 preferably includes: an input component 3 arranged on the first axis A1 and drivingly connected to the driving force source MG; a sub-gear mechanism 4 arranged on a second axis A2 different from the first axis A1; and a differential gear device 5 arranged on a third axis A3 different from the first axis A1 and the second axis A2, distributing the driving force transmitted from the driving force source MG to the pair of wheels, the differential gear device 5 being supported by a first differential bearing 95 and a second differential bearing 96 so as to be rotatable relative to the housing 2, and being provided with a first supply path P1 for supplying the oil F stored in the first oil chamber 10Ba to the input component 3, the sub-gear mechanism 4 and the first differential bearing 95; and a second supply path P2 for supplying the oil F stored in the second oil chamber 10Bb to the second differential bearing 96.

According to this configuration, the oil F can be appropriately supplied to each part of the gear mechanism 1 using the first supply passage P1 and the second supply passage P2.

[Possibility of Industrial Application]

The technology of the present invention can be used for a vehicle drive transmission device that transmits drive force between a drive force source and a pair of wheels.

Claims (5)

1. A vehicular drive transmission device for transmitting a driving force between a driving force source and a pair of wheels, comprising:

a gear mechanism provided in a power transmission path connecting the driving force source and the pair of wheels;

a housing having a first storage portion for storing oil and accommodating the gear mechanism; and

A storage part component which is arranged above the first storage part and forms a second storage part for storing oil,

The gear mechanism includes: a gear, a shaft member connected to the gear, and a bearing rotatably supporting the shaft member with respect to the housing,

The housing has a bearing support portion for supporting the bearing,

The storage part component has a first contact part which contacts the bearing support part via a first elastic member having elasticity,

The housing has a second side wall portion extending in a radial direction,

The second side wall portion is disposed on a side opposite to the side of the bearing support portion in the axial direction with respect to the storage portion component member,

The storage portion component member has a second contact portion that contacts the second side wall portion via a second elastic member having elasticity.

2. The drive transmission device for a vehicle according to claim 1, wherein,

The housing includes a first side wall portion extending in a radial direction,

The bearing support portion includes: a protrusion portion protruding from the first side wall portion in an axial direction so as to support the bearing from the radially outer side,

The first contact portion contacts the protruding portion via the first elastic member.

3. The drive transmission device for a vehicle according to claim 1 or 2, wherein the first elastic member is a seal member that seals a gap between the reservoir component member and the bearing support portion,

The storage part component has a dividing wall part extending upward from the first contact part,

The dividing wall portion divides the second storage portion into: a first oil chamber located on a side opposite to the side of the bearing support portion in the axial direction with respect to the partition wall portion; and a second oil chamber located on one side of the bearing support portion in the axial direction with respect to the partition wall portion.

4. A drive transmission apparatus for a vehicle according to claim 3, wherein,

The second oil chamber is configured using the partition wall portion and the bearing support portion.

5. A drive transmission apparatus for a vehicle according to claim 3, wherein,

The gear mechanism includes:

an input member disposed on the first shaft and connected to the driving force source in a driving manner;

a pinion mechanism disposed on a second shaft different from the first shaft; and

A differential gear device disposed on a third shaft different from the first shaft and the second shaft, for distributing the driving force transmitted from one side of the driving force source to a pair of wheels,

The differential gear device is supported rotatably with respect to the housing by a first differential bearing and a second differential bearing,

A first supply path for supplying the oil stored in the first oil chamber to the input member, the pinion gear mechanism, and the first differential bearing; and a second supply path for supplying the oil stored in the second oil chamber to the second differential bearing.