CN-122014825-A - Differential device for vehicle and vehicle

Abstract

Provided are a vehicle differential device and a vehicle, wherein differential limiting torque can be adjusted with a simple structure. The rear differential device includes a differential gear box rotated by a driving force of a rear drive motor, a pair of side gears coaxial with a rotation shaft of the differential gear box, a pinion gear engaged with both of the pair of side gears, and a differential limiting mechanism for generating differential limiting torque 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. The case-side friction plate of the friction plates is provided to the differential case, and the gear-side friction plate is provided to the side gear. The case-side friction plate and the gear-side friction plate are arranged in an axial direction, and a differential limiting torque is generated by sliding each other. The first sliding diameters of the first case side friction plate and the first gear side friction plate and the second sliding diameters of the second case side friction plate and the second gear side friction plate are different from each other.

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 differential limiting torque 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 torque is generated by sliding each other, The case side friction plate includes a first case side friction plate and a second case side friction plate, The gear-side friction plate includes a first gear-side friction plate and a second gear-side friction plate, The first sliding diameters of the first case side friction plate and the first gear side friction plate and the second sliding diameters of the second case side friction plate and the second gear side friction plate are different from each other.
2. 2. The differential device for a vehicle according to claim 1, wherein, The first inner diameter of the first case side friction plate and the second inner diameter of the second case side friction plate are different from each other.
3. 3. The differential device for a vehicle according to claim 1, wherein, The first outer diameter of the first gear-side friction plate and the second outer diameter of the second gear-side friction plate are different from each other.
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 first differential limiting mechanism includes the first case side friction plate, the first gear side friction plate, the second case side friction plate, and the second gear side friction plate, In the first differential limiting mechanism, the first sliding diameters of the first case side friction plate and the first gear side friction plate and the second sliding diameters of the second case side friction plate and the second gear side friction plate are different from each other.
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 first differential limiting mechanism has the first case side friction plate and the first gear side friction plate, The second differential limiting mechanism has the second case side friction plate and the second gear side friction plate, The first case side friction plate in the first differential limiting mechanism and the first slip diameter of the first gear side friction plate and the second case side friction plate in the second differential limiting mechanism and the second slip diameter of the second gear side friction plate 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 torque 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 torque 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 vehicle differential device, it is desirable to adjust differential limiting torque by a differential limiting mechanism in order to balance the straight running stability of a vehicle and the turning easiness of the vehicle. Disclosure of Invention The invention provides a differential device for a vehicle, which can adjust differential limiting torque with a simple structure. Technical means for solving the technical problems A differential device for a vehicle according to the present invention is a differential device for a vehicle mounted on a vehicle, and includes a differential gear case rotated by a driving force of a driving source, a pair of side gears disposed in the differential gear case and coaxial with a rotation shaft of the differential gear case, a pinion disposed in the differential gear case and engaged with both of the pair of side gears, and a differential limiting mechanism for generating differential limiting torque for limiting a differential motion of wheels of the vehicle, wherein the differential limiting mechanism includes a plurality of friction plates, a portion of the plurality of friction plates is a plurality of case side friction plates provided in the differential gear case by pressing the plurality of friction plates in an axial direction in which the side gears extend, the other portion of the plurality of friction plates is a plurality of gear side friction plates provided in the side gears, the case side friction plates and the gear side friction plates are disposed in an arrangement in the axial direction, and the differential limiting torque is generated by sliding each other, the case side friction plates include a first case side friction plate and a second case side friction plate, the first case side friction plate and the second case side friction plate include a second case side friction plate, and the first friction plate and the second friction plate are the same in diameter, and the first friction plate and the second friction plate are not sliding with the first friction plate. The first sliding diameters of the first case side friction plate and the first gear side friction plate and the second sliding diameters of the second case side friction plate and the second gear side friction plate are made different from each other. When the first slip diameter is smaller than the second slip diameter, the differential limiting torque is smaller than in the case where the first slip diameter and the second slip diameter are equal. When the first slip diameter is larger than the second slip diameter, the differential limiting torque becomes larger than in the case where the first slip diameter and the second slip diameter are equal. In this way, by adjusting the first slip diameter and the second slip diameter, the differential limiting torque for limiting the differential motion of the wheels of the vehicle can be adjusted. As described above, it is possible to provide a differential device for a vehicle capable of adjusting differential torque limit with a simple structure. In one embodiment, the first inner diameter of the first case side friction plate and the second inner diameter of the second case side friction plate are different from each other. The first sliding diameter and the second sliding diameter can be easily adjusted. In one embodiment, the first outer diameter of the first gear-side friction plate and the second outer diameter of the second gear-side friction plate are different from each other. The first sliding diameter and the second sliding diameter can be easily adjusted.