JPH0328204Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] This invention relates to an improvement in a vehicle differential.

[Prior art and its problems] In a differential device that allows differential rotation of wheels,
For example, as disclosed in Japanese Utility Model Application No. 58-170444, the sealing structure cannot be achieved and oil cannot be filled until after the left and right output shafts are respectively fitted into the side gears. Therefore, sub-assemblies that include oil filling are not possible, and for this reason, oil filling work has to be done on the vehicle assembly line, which greatly affects assembly work, and there are obstacles in the oil filling work. In the end, this made the assembly work extremely difficult and caused inconvenience in terms of parts management.

[Purpose of the invention] Therefore, this invention allows the differential case to be installed without having to fit the left and right output shafts into the side gears of the differential case.
A sealed part including a meshing part is provided in the housing, and a subassembly including oil sealing is possible.
The present invention provides a differential gear that has a structure that improves the durability of the lever members and does not adversely affect the vehicle assembly process.

[Structure of the invention] In order to achieve the above object, this invention includes a differential case rotatably supported by a differential carrier, and a pinion shaft rotatably supported within the differential case. In a slip-limiting differential device comprising a differential gear mechanism having a supported pinion gear and a pair of side gears capable of transmitting rotation to a pair of left and right output shafts meshing with the pinion gear, the outer ends of the side gears and the differential - a pair of first seal members provided between the first seal member and the inner end portions of both side gears, each of which fits into the inner end portions of the shaft holes of the side gears and engages with the inner end portions of the side gears in the direction of the rotation axis. , a pair of thrust blocks abutting each other;
A pair of second seal members are provided between the outer periphery of these blocks and the shaft hole of the side gear, and a sealed part including the meshing part is provided in the differential case.

[Embodiment] Hereinafter, an embodiment of this invention will be described in detail with reference to the drawing of FIG.

A pinion gear 5 is rotatably fitted into a pinion shaft 3 near the center of the differential case 1.

Side gears 7 are arranged on the left and right sides of this pinion gear 5 and mesh with the pinion gear 5. Left and right output shafts 9 and 11 are fitted into each side gear 7, respectively, and the output shaft 9 is connected to a left wheel drive shaft (not shown).
The output shaft 11 is connected to a right wheel drive shaft (not shown). Left and right side gears 7 inside this differential case 1
Multi-plate friction clutches 13 are incorporated on the left and right sides as slip limiting means. The differential case 1 is rotatably supported by a differential carrier (not shown) and rotated by being driven from an input shaft (not shown) via a hypoid gear (not shown).

The friction clutch 13 is provided with a pressure ring 17 that presses and moves the clutch plate 15 to bring it into the engaged state. pressure ring 1
7 is located on the left and right sides, and is engaged near the center of the differential case 1 and near the end of the pinion shaft 3 by a cam mechanism 19. Also, there is a protrusion on the outer periphery of the pressure ring 17. It is assembled so as to engage with a recess on the inner circumference of the base 1. Said clutch plate 1
5 is connected to the side gear 7 side and the differential case 1.
They are lined up so that they are alternately locked to each spline on the side, and are movable in the axial direction. One end surface of the block on which the clutch plates 15 are arranged is in contact with the inner side of the differential case 1, and the other end surface is in contact with the pressure ring 17.

In the slip-limiting differential with the above structure, the outer ends of the left and right side gears 7 and the differential cable are connected to each other.
One oil seal is installed on each side as a pair of first seal members 21 between the oil seal 1 and the oil seal 1. At the inner ends of the left and right side gears 7, a pair of blocks 23 are fitted into the shaft holes of these side gears to close the shaft holes, and the outer circumferences of these blocks 23 and the shaft holes of the left and right side gears 7 are connected to each other. One O-ring is installed on each side as a pair of second seal members 25 between the two. The block 23 also serves as a so-called thrust block that maintains the axial relative positions of the left and right output shafts 9, 11 so that they do not fall below a predetermined distance.

The first seal member 21 and the second seal member 25
By mounting, a sealed portion 27 is formed within the differential case 1 within the mounting range of these seal members, and the clutch 15, pinion gear 5, and side gear 7 are included within this range. Then, the block 23
The pair of second sealing members 25 are in contact with each other on the left and right sides in the longitudinal direction of the blocks 23, and in this inner area (in the central part in the embodiment), these two blocks 23 are in contact with each other on the left and right sides at right angles to the axis. It has been cut into parts. The block 23 can be rotated relative to the left and right sides at this dividing surface 29. That is, the left and right divided portions of the block 23 are spline-locked together with the left and right output shafts 9 and 11 in the shaft holes of the left and right side gears 7, respectively, and rotate together with them.
When differential rotation occurs, relative rotation occurs at the dividing surface 29.

Alternatively, instead of engaging the left and right divided portions of the block 23 with spline engagement as described above,
If a thrust ball bearing or a sheet of a low frictional resistance material is interposed in the dividing surface 29 by bringing it into contact with each end surface of the left and right output shafts 9 and 11, respectively,
The left and right divided portions of the block 23 are almost integrated with the left and right output shafts 9 and 11 due to the frictional resistance with the second seal member 25 between the side gear 7 and the frictional resistance with the output shaft end surface, respectively. relative rotation is possible at the dividing surface 29.

With this structure, the seal of the second seal member 25 installed between the left and right divided portions of the block 23 and the left and right side gears 7 is improved.
This makes it possible to substantially prevent the sliding of the lip from occurring, thereby extending the life of the second seal member 25 semi-permanently.

In addition, in the above configuration, the left and right output shafts 9, 1
Since the sealed part 27 is formed in the differential case 1 without installing the differential case 1, at that point, oil is filled from the oil inlet with a check valve structure (not shown) provided in the differential case 1. Let's do it.

[Effects of the invention] As explained above, according to the differential device of this invention, it is possible to form the sealing part necessary for oil sealing before installing the left and right output shafts, and it is possible to form a subassembly including oil sealing. As a result, the assembly work is streamlined, parts management becomes easier, and the vehicle assembly process is not adversely affected. Furthermore, since the differential device can be sealed even when the output shaft is not installed, foreign matter does not enter the differential device during transportation, and the quality of the oil can be maintained.

Furthermore, since the second seal member is provided using a divided thrust block, the second seal member can be used in a place where there is no relative movement, and the life of the seal can be extended. At the same time, assembly can be significantly facilitated.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the limited slip differential of this invention. Explanation of main drawing symbols, 1... differential case, 3
... Pinion shaft, 5 ... Pinion gear, 7
... Side gear, 9 ... Output shaft, 11 ... Output shaft, 15 ... Clutch plate, 21 ... First seal member, 23 ... Cylindrical body, 25 ... Second seal member,
27...Sealed part, 29...Divided surface.

Claims (1)

[Scope of utility model registration request] The differential gear is rotatably supported by the differential carrier.
a pinion gear rotatably supported by a pinion shaft supported within the differential case;
In a differential device comprising a differential gear mechanism having a pair of side gears meshing with the pinion gear and capable of transmitting rotation to a pair of left and right output shafts, the differential gear mechanism is provided between the outer ends of the side gears and the differential case. a pair of first seal members, and a pair of thrust blocks that fit into the inner ends of the shaft holes of the side gears, engage with each other in the rotational direction, and abut each other at the inner ends of the side gears. A differential comprising a pair of second seal members provided between an outer periphery and a shaft hole of the side gear, and a sealing portion including the meshing portion within the differential case. Device.