CN-122014824-A - Differential device for vehicle and vehicle

Abstract

Provided are a vehicle differential device and a vehicle, wherein differential restraining force can be adjusted with a simple structure. The rear differential device includes a differential gear case rotated by a driving force of a rear drive motor, a pair of side gears coaxial with a rotation shaft of the differential gear case, a pinion gear engaged with both of the pair of side gears, and a differential limiting mechanism for generating a differential limiting force for limiting a differential motion of a rear wheel of the vehicle. The differential limiting mechanism has a plurality of friction plates pressed in the axial direction by the side gears. Some of the plurality of friction plates are case-side friction plates provided to the differential case, and the other is gear-side friction plates provided to the side gears. The case-side friction plate and the gear-side friction plate are arranged in an axial direction, and a differential restricting force is generated by sliding. In the differential limiting mechanism, a friction plate abutting portion is formed by abutting two or more friction plates of the same kind, which are at least one of a case side friction plate and a gear side friction plate.

Inventors

• Gang Shenzhi
• OKAWA YASUZO

Assignees

• 马自达汽车株式会社

Dates

Publication Date

20260512

Application Date

20251104

Priority Date

20241112

Claims (8)

1. 1. A differential device for a vehicle mounted on a vehicle is characterized by comprising: a differential gear case that rotates by receiving a driving force of the driving source; A pair of side gears disposed in the differential gear case and coaxial with a rotation axis of the differential gear case; A pinion gear disposed in the differential gear box and meshed with both of the pair of side gears, and A differential limiting mechanism that generates a differential limiting force for limiting a differential of wheels of the vehicle, The differential limiting mechanism has a plurality of friction plates pressed by the side gears in an axial direction extending along the rotation shaft, A part of the plurality of friction plates is a plurality of case side friction plates provided to the differential case, Another part of the plurality of friction plates is a plurality of gear side friction plates provided to the side gears, The case side friction plate and the gear side friction plate are arranged in the axial direction, and the differential limiting force is generated by sliding each other, In the differential limiting mechanism, a friction plate abutting portion is formed by abutting two or more friction plates of the same kind of at least one of the case side friction plate and the gear side friction plate.
2. 2. The differential device for a vehicle according to claim 1, wherein, The friction plate abutting portion includes a case side friction plate abutting portion formed by abutting two or more case side friction plates.
3. 3. The differential device for a vehicle according to claim 1, wherein, The friction plate abutting portion includes a gear-side friction plate abutting portion formed by abutting two or more of the gear-side friction plates.
4. 4. A differential device for a vehicle according to any one of claim 1 to 3, wherein, The differential limiting mechanism includes a first differential limiting mechanism provided on one side in the axial direction with respect to the pinion gear, and a second differential limiting mechanism provided on the other side in the axial direction with respect to the pinion gear, The friction plate abutting portion is formed in both the first differential limiting mechanism and the second differential limiting mechanism.
5. 5. A differential device for a vehicle according to any one of claim 1 to 3, wherein, The differential limiting mechanism includes a first differential limiting mechanism provided on one side in the axial direction with respect to the pinion gear, and a second differential limiting mechanism provided on the other side in the axial direction with respect to the pinion gear, The number of the sliding surfaces of the case side friction plate and the gear side friction plate in the first differential limiting mechanism and the number of the sliding surfaces of the case side friction plate and the gear side friction plate in the second differential limiting mechanism are different from each other.
6. 6. A differential device for a vehicle according to any one of claim 1 to 3, wherein, The side gear has a gear body that meshes with the pinion gear, and a pressing body that sandwiches the plurality of friction plates together with the gear body, The gear body and the pressing body are engaged with each other, The gear-side friction plate is provided to the pressing body.
7. 7. A differential device for a vehicle according to any one of claim 1 to 3, wherein, The vehicle is either rear wheel drive or all wheel drive, The vehicular differential device is used for differential control of rear wheels of the vehicle.
8. 8. A vehicle, characterized by comprising: a front-side driving unit that rotates the front wheel; a rear drive unit that rotates a rear wheel independently of the front drive unit, and that has the differential device for a vehicle according to claim 7.

Description

Differential device for vehicle and vehicle Technical Field The present invention relates to a differential device for a vehicle and a vehicle. Background A differential device for a vehicle provided with a differential limiting mechanism is known. For example, a differential device for a vehicle disclosed in patent document 1 includes a differential gear box rotationally driven by a driving force of an engine, a differential gear mechanism for distributing rotation of the differential gear box to wheel sides via a pair of side gears, a cone clutch fastened by an engagement reaction force of the side gears formed between the differential gear box and a clutch member and restricting a differential of the differential gear mechanism, and a cam mechanism provided between the clutch member and the side gears and receiving the driving force to press the cone clutch. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 09-49560. Technical problem to be solved by the invention When the differential limiting force by the differential limiting mechanism is large, the straight running stability of the vehicle is improved, but it is difficult for the vehicle to turn. When the differential limiting force by the differential limiting mechanism is small, the vehicle is liable to turn, but the straight running stability of the vehicle is lowered. In a differential device for a vehicle, in order to balance the straight running stability of the vehicle and the turning easiness of the vehicle, it is desirable to adjust the differential restriction force by the differential restriction mechanism. Disclosure of Invention The invention provides a differential device for a vehicle, which can adjust differential limiting force with a simple structure. Technical means for solving the technical problems The vehicle differential device according to the present embodiment is a vehicle differential device mounted on a vehicle, and includes a differential case rotated by a driving force of a driving source, a pair of side gears disposed in the differential case and coaxial with a rotation axis of the differential case, a pinion disposed in the differential case and engaged with both of the pair of side gears, and a differential limiting mechanism that generates differential limiting force for limiting a differential motion of wheels of the vehicle, the differential limiting mechanism having a plurality of friction plates, a plurality of case side friction plates provided in the differential case being pressed by the side gears in an axial direction in which the rotation axis extends, a plurality of other portions of the friction plates being a plurality of gear side friction plates provided in the side gears, the case side friction plates and the gear side friction plates being arranged in the axial direction and generating the differential limiting force by sliding each other, and in the differential limiting mechanism, at least one of the case side friction plates and the case side friction plates being in abutment with each other. If the number of friction plate abutting portions is increased or the number of friction plates of the same kind constituting the friction plate abutting portions is increased, the number of sliding surfaces of the case side friction plate and the gear side friction plate is reduced, and therefore the differential limiting force becomes small. If the number of friction plate abutting portions is reduced or the number of friction plates of the same kind constituting the friction plate abutting portions is reduced, the number of sliding surfaces of the case side friction plate and the gear side friction plate increases, and therefore the differential limiting force increases. In this way, by adjusting the number of friction plate abutting portions or the number of friction plates of the same kind constituting the friction plate abutting portions, the differential limiting force for limiting the differential motion of the wheels of the vehicle can be adjusted. As described above, a vehicle differential device capable of adjusting differential restraining force with a simple structure can be provided. In one embodiment, the friction plate abutting portion includes a case side friction plate abutting portion formed by abutting two or more case side friction plates. By abutting a plurality of case-side friction plates, a case-side friction plate abutting portion as a friction plate abutting portion can be simply constituted. In one embodiment, the friction plate abutting portion includes a gear side friction plate abutting portion formed by abutting two or more of the gear side friction plates. By abutting a plurality of gear-side friction plates, a gear-side friction plate abutting portion as a friction plate abutting portion can be simply constituted. In one embodiment, the differential limiting mechanism includes a first differential limiting mechanism provided on one side in