JPH0516439Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is based on a vehicle differential device, in particular, a differential limiting means that limits differential movement by frictional force, and a differential limiting means that limits differential movement by frictional force. The present invention relates to a vehicle differential device including a pressure member that is pressed and moved in an increasing direction, and a fluid pressure cylinder that drives the pressure member.

(Prior art) In a differential device that allows differential rotation between wheels, if one wheel slips, the driving force on the other wheel side is lost, making it difficult to escape from that point. may be difficult. In order to prevent such a situation, for example, as disclosed in Japanese Patent Publication No. 57-4536, hydraulic pressure is applied to the friction clutch built into the differential device, and the differential limiting function is controlled externally. There are some that are adjustable.

In addition to the friction clutch, this type of device is equipped with a pressure member that can press and move the friction clutch in the direction of increasing frictional force, and an actuator that drives the pressure member. The actuator can be operated manually or controlled by a control circuit using a microcomputer or the like (electronically controlled differential device).

By the way, the actuator is an annular hydraulic cylinder and is arranged around the output shaft. Such a hydraulic cylinder is arranged at the support of the differential carrier. The differential carrier is formed with a hydraulic oil passage to the hydraulic cylinder and a bearing fitting hole for supporting the output shaft.

(Problem to be solved by the invention) However, in the case of such a conventional structure, since the hydraulic cylinder is provided in the differential carrier itself, the differential carrier needs to have a structure exclusively for the hydraulically controlled differential device. However, it is not possible to share the differential carrier of a general differential device that does not have an actuator, resulting in high costs and troublesome assembly.

Therefore, this idea was devised in view of the above-mentioned conventional problems, and with a simple configuration, it is possible to use the differential carrier of a differential device with an adjustable differential limiting function in common with the differential carrier of a general differential device. The purpose of the present invention is to provide a vehicle differential device that has the following features.

(Means for Solving the Problems) In order to achieve the above object, this invention includes a differential case rotatably arranged and supported via a bearing fitted in a bearing fitting hole in a differential carrier having an opening; A differential gear mechanism provided in a differential case and capable of differential rotation; a differential limiting means for limiting the differential rotation of the differential gear mechanism by frictional force; A pressure member capable of pressing and a piston in contact with the pressure member are held slidably in the axial direction and supported in the bearing fitting hole, and the back pressure is received by contacting the bearing and being positioned in the axial direction. The hydraulic cylinder is connected to the hydraulic cylinder, and a working fluid passage is attached to a cover that is connected to the hydraulic cylinder and is detachably attached to the differential carrier so as to cover the opening.

(Embodiment) An embodiment of the vehicle differential device of this invention will be described with reference to the drawings.

A pinion gear 5 is rotatably fitted into a pinion shaft 3 near the center of the differential case 1. Side gears 7a and 7b are disposed on the left and right sides of the pinion gear 5 and mesh with the pinion gear 5. Output shafts 9 and 11 are fitted into the side gears 7a and 7b, respectively, and the output shaft 9 is connected to a left wheel (not shown), and the output shaft 11 is connected to a right wheel (not shown).

A multi-plate friction clutch 13 is incorporated between the differential case 1 and one side gear 7a as an operation limiting means for limiting differential movement by frictional force. Further, a ring gear 17a is disposed on a flange portion provided on the outer periphery of the differential case 1 on one side (left side in the drawing) of the pinion shaft 3,
At the end of the input shaft 15 is a drive pinion gear 17 that constitutes a hypoid gear with a ring gear 17a.
b is attached. The input from the input shaft 15 is now transmitted to the differential case 1 and driven to rotate.

Half of the friction plates 19 of the friction clutch 13 are locked to the spline on the inner circumference of the differential case 1 so as to be able to move in thrust, and the remaining half 21 are locked to the spline on the outer periphery of the boss of the side gear 7a so that they can be moved in thrust, and they are arranged alternately. It is located. A pressure ring (pressure member) 23 that can be pressed and moved in the direction of increasing frictional force is connected to the side gear 7 of the differential case 1 so as to press and move these friction plates 19 and 21 so as to bring them into contact with each other and thereby tighten the friction clutch 13.
It is fitted onto the outer peripheral surface of the b side so as to be movable in the axial direction of the output shaft 11. The pressure ring 23 and the friction clutch 13 are a pressure rod (pressure member) that is slidably inserted into a hole 1a formed in the differential case 1 along the axial direction of the output shaft 11.
25.

An annular hydraulic cylinder (hydraulic cylinder) 29 is provided between the bearing 27 for supporting the output shaft around the output shaft 11 and the pressure ring 23.
is interposed. The cylinder portion 29a of the hydraulic cylinder 29 has a protruding portion 29b at its rear end in the pressing direction.
is fitted and fixed into the bearing fitting hole 33 of the differential carrier 31. End surface 29c of rear end protrusion 29b
is in contact with the end surface 27b of the outer race 27a of the bearing 27. Due to this contact, the hydraulic cylinder 29 is stopped from moving backward (to the right in the figure) and is positioned when hydraulic pressure (back pressure or reaction force), which will be described later, is applied inside the cylinder portion 29a. , which absorbs the back pressure. The cylinder part 2 of such a hydraulic cylinder 29
Inside 9a, a ring-shaped piston 35 facing the pressure ring 23 is provided with a sealing material (O-ring) 37.
It is fitted in such a way that it slides in a liquid-tight manner.
The front end surface of this piston 35 and the pressure ring 2
A thrust bearing 39 is interposed between the rear end surfaces of 3. In the thrust bearing 39, the retainer on the inner circumference side is the rear step part 2 of the pressure ring 23.
It is rotatably locked to 3a.

A hydraulic oil supply hole (working fluid passage) 41 is formed in one side of a differential cover 40 attached to the lower surface side of the differential carrier 31 in the figure.
1 and the hydraulic oil chamber 42 of the hydraulic cylinder 29 are connected by a hydraulic oil pipe 43. Therefore, the hydraulic oil flowing into the hydraulic oil supply hole 41 is supplied from the piping (hydraulic fluid passage) 43 to the hydraulic oil chamber 42, which causes the piston 35 to slide and pressurize the pressure ring 2.
Press 3. Further, the pressure ring 23 presses the friction clutch 13 via the pressure rod 25 in the direction of increasing the frictional force.

The hydraulic cylinder 29 as an actuator that presses the friction clutch 13 includes a sensor, a control circuit,
A control system (not shown) comprising a regulator and the like adjusts the amount of hydraulic oil supplied based on road surface conditions and controls the operation.

The left and right ends of the differential case 1 are supported by a differential carrier 31 by bearings 27 and 45.

According to such a configuration, the hydraulic cylinder 29 is simply supported in contact with a part of the differential carrier 31 and is connected to the piping 4 for hydraulic oil supplied to the hydraulic cylinder 29.
Since the third oil passage is provided in the differential cover 40, the differential carrier 31 can be used in common with a general differential device in which the differential limiting function cannot be adjusted.

(Effects) As described above, according to this invention, even if the differential device has an adjustable differential limiting function,
Since the differential carrier of a general differential device can be used in common, costs can be significantly reduced compared to conventional systems, and ease of assembly is also improved.

[Brief explanation of the drawing]

The drawing is a longitudinal cross-sectional view of one embodiment of the vehicle differential device of this invention. Explanation of main drawing symbols, 13... Friction clutch (differential limiting means), 23... Pressure ring (pressure member), 25... Pressure rod (pressure member), 29... Hydraulic cylinder (hydraulic cylinder), 29a...Cylinder part, 31...Differential carrier, 40...Differential cover.

Claims (1)

[Scope of utility model registration request] A differential case rotatably arranged and supported by a differential carrier having an opening through a bearing fitted in a bearing fitting hole, a differential gear mechanism provided in the differential case and capable of differential rotation, and a differential gear mechanism of the differential gear mechanism. A differential limiting means for limiting differential rotation by frictional force, a pressure member capable of pressing the differential limiting means in a direction of increasing frictional force, and a piston in contact with the pressure member slidably in the axial direction. a fluid pressure cylinder that is held and supported in the bearing fitting hole and receives back pressure by contacting the bearing and being positioned in the axial direction; A vehicle differential device comprising a removably attached cover and an attached working fluid passage.