CN-121993569-A - Differential device

Abstract

The invention provides a differential device capable of improving regeneration efficiency even if the differential limiting part is provided. The differential device (1) is provided with a differential case (7) which is rotatably arranged, a pinion (11) which is rotatably supported in the differential case (7) and revolves by the rotation of the differential case (7), a pair of side gears (13, 15) which are meshed with the pinion (11) and can rotate relatively, and a differential limiting part (5) which is arranged between the differential case (7) and the side gears (13, 15) and limits the differential motion of the pair of side gears (13, 15) by the sliding of sliding surfaces (33, 43), wherein a force application member (47) which applies force to the sliding surfaces (33, 43) of the differential limiting part (5) in the separating direction is arranged between the differential case (7) and the side gears (13, 15).

Inventors

• Guang Tiangong

Assignees

• 吉凯恩汽车有限公司

Dates

Publication Date

20260508

Application Date

20250327

Priority Date

20241101

Claims (6)

1. 1. A differential device is characterized by comprising: a differential case configured to be rotatable; a pinion rotatably supported in the differential case and revolved by rotation of the differential case; A pair of side gears engaged with the pinion gears and rotatable relative to each other, and A differential limiting portion provided between the differential case and the side gears, for limiting the differential motion of the pair of side gears by sliding the sliding surfaces, An urging member that urges the sliding surface of the differential limiting portion in a direction of separating is disposed between the differential case and the side gear.
2. 2. A differential device according to claim 1, wherein, The urging member is provided with a bearing between the urging member and either one of the differential case and the side gear.
3. 3. A differential device according to claim 1, wherein, The side gear has a gear member engaged with the pinion gear and an operating member configured to be rotatable integrally with the gear member via a cam portion and axially movable, The urging member is configured to urge in a direction against the cam thrust of the cam portion.
4. 4. A differential device as claimed in claim 3, wherein, The differential limiting portion slides on the sliding surface provided between the differential case and the side gear when the biasing member is deflected by a predetermined cam thrust force of the cam portion.
5. 5. A differential device as claimed in any one of claims 1 to 3, wherein, The differential case is driven by a driving force from an electric motor, and is disposed in a driving path for regenerating a regenerative force from wheels to the electric motor, The biasing member maintains a gap of the sliding surface so that a friction torque of the differential limiting portion corresponding to a set upper limit value of the regenerative torque can be controlled.
6. 6. A differential device as claimed in claim 3 or 4, wherein, The cam portion is set with a cam angle that varies depending on the rotation direction.

Description

Differential device Technical Field The present invention relates to a differential device. Background In the related art, a differential device includes a differential case rotatably disposed, a pinion rotatably supported in the differential case and revolved by rotation of the differential case, and a pair of side gears meshed with the pinion and rotatable relative to each other. Further, there is known a device provided with a differential limiting portion provided between a differential case and a side gear, and limiting differential motion of a pair of side gears by sliding a sliding surface (see patent document 1). In this differential device, the sliding surface of the differential limiting portion slides, and the differential motion of the pair of side gears is limited. The differential motion of the pair of side gears is restricted to prevent the spin of the wheels, and the passing performance of the vehicle can be improved. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2019-124264 Disclosure of Invention Problems to be solved by the invention However, in the differential device disclosed in patent document 1, when the vehicle runs without inputting a driving force from an electric motor as a driving source to the differential case, the pair of side gears rotate due to rotation from the wheel side. The rotation of the pair of side gears becomes a regenerative force (a term defined in the present invention) for rotating the differential case and charging the power supply with the electric motor. However, if the differential limiting characteristic of the differential limiting portion is high, the regeneration efficiency is reduced compared to a case where the differential limiting characteristic is low, such as a so-called open differential having no differential limiting portion. The present invention has been made in view of the problems of the prior art as described above. Further, an object of the present invention is to provide a differential device capable of improving the regeneration efficiency even if the differential limiting section is provided. Means for solving the problems The differential device of the present embodiment includes a differential case rotatably disposed in the differential case, a pinion rotatably supported in the differential case and revolved by rotation of the differential case, a pair of side gears engaged with the pinion and rotatable relative to each other, and a differential limiting portion provided between the differential case and the side gears, wherein a differential between the pair of side gears is limited by sliding of a sliding surface, and a biasing member for biasing the sliding surface of the differential limiting portion in a direction of separation is disposed between the differential case and the side gears. The effects of the invention are as follows. According to the present invention, a differential device can be provided that can improve the regeneration efficiency even if the differential limiting section is provided. Drawings Fig. 1 is a cross-sectional view of a differential device of the present embodiment. Fig. 2 is a diagram showing a change in load of the biasing member of the differential device according to the present embodiment with respect to the deflection. Fig. 3 is a TBR line of the differential device of the present embodiment. Symbol description 1-Differential device, 5-differential limiting portion, 7-differential housing, 11-pinion, 13, 15-side gear, 29-gear member, 31-actuating member, 33, 43-sliding surface, 39-cam portion, 43-sliding surface, 47-urging member, 49-bearing. Detailed Description Hereinafter, the differential device of the present embodiment will be described in detail with reference to the drawings. In addition, the dimensional ratio of the drawings may be exaggerated for convenience of explanation, and may be different from the actual ratio. As shown in fig. 1, the differential device 1 of the present embodiment is disposed between an electric motor (not shown) as a driving source and left and right wheels (not shown), for example. The driving force from the electric motor is transmitted to the differential device 1 via a transmission (not shown), and the driving force is distributed to the right and left wheels via a pair of output shafts (not shown). On the other hand, when the vehicle is running without driving force from the electric motor being input, regenerative force from the wheels is input to the electric motor via the differential device 1, and a power source (not shown) such as a battery or a storage battery is charged via the electric motor. As shown in fig. 1, the differential device 1 includes a differential mechanism 3 and a differential limiting section 5. The differential mechanism 3 includes a differential case 7, a pinion shaft 9, a pinion 11, and a pair of side gears 13 and 15. The differential case 7 is constituted by a divided struct