CN-121977058-A - Differential device

Abstract

The invention provides a differential device capable of stabilizing differential limiting characteristics. A differential device (1) is provided with a differential case (7), a pinion gear (11), a pair of side gears (13), and a differential limiting section (5) which is provided between the differential case and the side gears, wherein the differential of the pair of side gears (13) is limited by the sliding of sliding surfaces (41, 51), the side gears (13) are provided with a gear member (33) which meshes with the pinion gear (11), and an operating member (35) which is disposed so as to be rotatable integrally with the gear member via a cam section (47) and axially movable, the operating member is provided with a flange section (37) which is disposed on the inner diameter side and on the outer diameter side with a cam section (5), and the value A/B obtained by dividing the length A in the radial direction between the contact point of the cam section and the contact point of the sliding surface of the differential limiting section (5) by the axial thickness B is set to be 5 or less.

Inventors

• Guang Tiangong
• Sichuan Heyang Fu
• JI CHUANZHONG
• Nei Tiansheng

Assignees

• 吉凯恩汽车有限公司

Dates

Publication Date

20260505

Application Date

20250326

Priority Date

20241031

Claims (5)

1. 1. A differential device, characterized by comprising: A differential case configured to be rotatable; a pinion gear that is rotatably supported in the differential case and revolves by rotation of the differential case; A pair of side gears meshed with the pinion gears and capable of rotating relatively, 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, The side gear includes: a gear member engaged with the pinion gear, and An operating member which is disposed so as to be rotatable integrally with the gear member via a cam portion and is movable in an axial direction, The operating member has a flange portion on which the cam portion is disposed on an inner diameter side and the differential limiting portion is disposed on an outer diameter side, The flange portion is set so that a value A/B obtained by dividing a radial length A between a contact point of the cam portion and a contact point of the sliding surface of the differential limiting portion by an axial thickness B is 5 or less.
2. 2. The differential device according to claim 1, wherein, The thickness B of the flange portion is set to be a minimum thickness within a range of a radial length A between the contact point of the cam portion and the contact point of the sliding surface of the differential limiting portion.
3. 3. The differential device according to claim 1 or 2, wherein, When the contact point of the sliding surface and the contact point of the cam portion have a predetermined range in the radial direction, the length a in the radial direction is defined by an intermediate value.
4. 4. The differential device according to claim 1 or 2, wherein, Ribs are formed on the axially facing surfaces of the flange portions, The thickness B of the flange is defined as the axial height including the rib.
5. 5. The differential device according to claim 1 or 2, wherein, When the contact point of the sliding surface and the contact point of the cam portion have a predetermined range in the radial direction, the length a in the radial direction is defined by a maximum value in the radial direction of each contact point of the cam portion and the differential limiting portion.

Description

Differential device Technical Field The present invention relates to a differential device. Background Conventionally, as a differential device, a differential case rotatably supported by the differential case, a pinion gear that revolves by rotation of the differential case, and a pair of side gears that mesh with the pinion gear and are rotatable relative to each other are provided. In addition, a differential gear device is known that includes a differential limiting portion provided between a differential case and side gears, and that limits differential motion of a pair of side gears by sliding of a sliding surface (see patent document 1). In this differential device, the side gear includes a gear member engaged with the pinion gear, and an output member as an operating member, and the output member is rotatably integrally provided with the gear member via a cam portion and is axially movable. The output member has a flange portion, the flange portion having a cam portion disposed on an inner diameter side and a differential limiting portion disposed on an outer diameter side. In such a differential device, a cam thrust force for axially moving the output member is generated by the cam portion in accordance with an input torque from the drive source or a regenerative torque from the wheel side. By the movement of the output member in the moving direction due to the cam thrust of the cam portion, the sliding surface of the differential limiting portion slides, and the differential motion of the pair of side gears is limited. By restricting the differential motion of the pair of side gears, the spin of the wheels can be prevented, 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, the thickness of the flange portion of the operating member is reduced. Therefore, the flange portion is easily deformed, and the differential limiting characteristics may become unstable due to the deformation of the flange portion. The present invention has been made in view of the problems of the prior art as described above. Accordingly, an object of the present invention is to provide a differential gear device capable of stabilizing differential limiting characteristics. Means for solving the problems The differential device according to 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, the differential limiting portion limiting differential motion of the pair of side gears by sliding of a sliding surface, the side gears including a gear member engaged with the pinion, and an operating member integrally rotatable with the gear member via a cam portion and axially movable, the operating member including a flange portion having the cam portion disposed on an inner diameter side and the differential limiting portion disposed on an outer diameter side, the flange portion being set to a value A/B obtained by dividing a length A in a radial direction between a contact point of the cam portion and a contact point of the sliding surface of the differential limiting portion by a thickness B in an axial direction of the differential limiting portion, the flange portion being 5 or less. Effects of the invention According to the present invention, a differential gear device capable of stabilizing differential limiting characteristics can be provided. Drawings Fig. 1 is a cross-sectional view of a differential device according to the present embodiment. Fig. 2 is an enlarged view of a main portion of fig. 1. Fig. 3 is a TBR line of the differential device according to the present embodiment. Fig. 4 is a TBR line of the differential device of the comparative example. Fig. 5 is an enlarged cross-sectional view of a main part of another example of a flange portion of an operating member of the differential device according to the present embodiment. Detailed Description The differential device according to the present embodiment will be described in detail below with reference to the drawings. The dimensional ratio in the drawings is exaggerated for convenience of explanation and may be different from the actual ratio. As shown in fig. 1, a differential device 1 according to the present embodiment is disposed between a drive source (not shown) such as an engine or an electric motor and left and right wheels (not shown), for example. The driving force from the driving source is transmitted to the differential device 1 via a transmission (not shown), and the driving for