JPH0628982B2 - Side gear shaft projection structure of differential gear device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side gear shaft protrusion structure of a differential gear used in a vehicle such as an automobile.

2. Description of the Related Art A differential device used in a power transmission system of a vehicle such as an automobile generally has a side gear shaft projecting outward from an opening provided in a differential housing as an output shaft. In order to prevent the lubricating oil in the differential housing from leaking to the outside, and to support the side gear shaft from the differential housing, an annular oil seal structure and bearing are provided between the differential housing and the side gear shaft. Members are arranged, and a differential device having such a structure is disclosed in, for example, JP-A-58-170962 and JP-A-60-18656.

In the differential device having the structure as described above, it is necessary to pull out the oil seal structure every time the side gear shaft or the bearing member is detached, and it is not easy to attach and detach the oil seal structure. There is a problem that the structure is easily damaged. Further, there is a tapered roller bearing for supporting the ring gear mount from the differential housing in the inner part of the opening, and the bearing member and the oil seal structure must be removed every time the preload adjustment of the tapered roller bearing in the thrust direction is performed. ,
Its workability is poor.

In view of the above problem, the differential side gear shaft is divided into a first portion located inside the differential housing and a second portion protruding outward from the opening of the differential housing, and these two parts are butted in the axial direction. A cylindrical retainer, which has a combined structure and is detachably attached to the opening of the differential housing, is provided, and an oil seal structure and a bearing member are provided between the retainer and the second portion of the differential side gear shaft. And the second part of the differential side gear shaft is installed between the two together with the retainer so that the oil seal structure and the bearing member can be removed from the differential housing and reassembled without disassembling the oil seal structure and the bearing member. The structure is disclosed in JP-A-59-145627. That.

Problems to be Solved by the Invention According to the projecting structure of the side gear shaft of the differential device disclosed in Japanese Patent Laid-Open No. 59-145627, the differential device can be used without disassembling the oil seal structure and the bearing. The housing opening from which the side gear shaft projects can be opened, and the preload adjustment in the thrust direction of the tapered roller bearing described above can be performed, but the end of the side gear shaft protruding from the differential device usually passes through a universal joint. Since it is connected to the axle, there is an inconvenience that each retainer needs to be removed when the end of the side gear shaft is to be removed from the differential device when the universal joint is disassembled.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved side gear shaft protrusion structure for a differential device which solves the above-mentioned problems as well as the following problems.

Means for Solving the Problems According to the present invention, there is provided a structure of a protruding portion of a differential side gear shaft protruding outward from an opening of a differential housing, wherein the differential side gear shaft has a side surface. A gear intermediate shaft and a shaft coupling member each include a structure spline-coupled by a hollow side gear holder provided with a spline on an inner peripheral surface thereof butted in an axial direction at ends provided with splines,
A cylindrical retainer is detachably attached to the opening of the differential housing, and an oil seal structure and a bearing member are incorporated between the retainer and the side gear holder. This is achieved by the structure of the protrusion of the gear shaft.

According to the above-mentioned configuration, not only is it possible to remove the oil seal structure and the bearing member together with the retainer from the differential housing with the retainer mounted on the retainer, and to attach the oil seal structure and the bearing member to the differential housing. , When disassembling only the part of the differential side gear shaft projecting from the differential housing, that is, only the end of the differential gear shaft connected to the wheel, from the differential gear, projecting from the differential housing of the differential gear shaft without removing the retainer. You can easily remove only the part that you
Adjustments and servicing around the differential device and the connection between the differential device and the axle are facilitated.

Example Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an example of a four-wheel drive transfer device incorporating a side gear shaft protrusion structure of a differential device according to the present invention.

In FIG. 1, reference numeral 10 denotes an internal combustion engine, which is laterally placed at the front of the vehicle. The internal combustion engine includes an automatic transmission 12 for a vehicle and a transfer device 20 for four-wheel drive.
And are connected in sequence.

The automatic transmission 12 for a vehicle has a hydraulic torque converter and a transmission having a general structure. The hydrodynamic torque converter is drivingly connected to an output shaft of the internal combustion engine 10 by an input member and given rotational power from the internal combustion engine 10, and the output member is drivingly connected to an input member of the transmission. The transmission may have a general structure including a planetary gear set, and is adapted to switch between a plurality of forward shift stages and at least one reverse shift stage.

The four-wheel drive transfer device 20 has a center differential device 22. The center differential device 22 is rotatably supported by an input gear 24 that meshes with an output gear 16 provided on the output shaft 14 of the transmission, a differential case 26 connected to the input gear 24, and a spider 28 from the differential case 26. It has a differential pinion 30, and a rear wheel output side gear 32 and a front wheel output side gear 34 that mesh with the differential pinion 30, respectively.

A rear wheel output gear 36 is connected to the rear wheel output side gear 32, and a rear wheel drive gear 40 and a rear wheel drive gear 38 mesh with the rear wheel output gear 36.

A hollow front wheel drive shaft 42 is connected to the front wheel output side gear 34. The front wheel drive shaft 42 is drivingly connected to a differential case 46 of a front differential device 44. Front differential device 4
Reference numeral 4 has a differential pinion 50 rotatably supported by the spider 48 from the differential case 46, a differential side gear 52 and a left side gear 54 that mesh with the differential pinion 50, and the right side gear 52 has One ends of the both side gear shafts 56 are drivingly connected to the left side gear 54, and one ends of the left side gear shafts 58 are drivingly connected to the left side gears 54.

In the four-wheel drive transfer device 20, a differential case 26 which is an input member of the center differential device 22, a differential case 46 which is one output member of the center differential device 22 and a differential case 46 which is integral with the front wheel drive shaft 42, and a torque transmission relationship are selectively arranged. There is provided a hydraulically operated differential control clutch 60 connected to the. Differential control clutch 60
Is a hydraulic servo-type wet multi-plate clutch, in which the servo piston is moved against the return spring force by the servo hydraulic pressure supplied to the oil chamber of the hydraulic servo device, whereby the differential case 26 and the differential case 4 are moved.
6 and 6 are connected in a torque transmission relationship, and the torque capacity thereof is proportionally increased as the servo hydraulic pressure supplied to the oil chamber increases.

FIG. 2 shows a specific embodiment of a four-wheel drive transfer device having a side gear shaft projection structure of a differential device according to the present invention. The rear wheel output gear 36 configured as a ring gear is fixed by a bolt 66 formed by an assembly of ring gear mount members 62 and 64, and the hollow hub portion 33 of the rear wheel output side gear 32 is fixed by the ring gear mount member 62. Is connected to the torque transfer function. Ring gear mount members 62 and 64
Are rotatably supported by tapered roller bearings 68 and 70 by truss cases 72 and 74, which are differential housings.

The right side gear shaft 56 is composed of a side gear intermediate shaft 76 and a hollow side gear shaft holder 78. The side gear intermediate shaft 76 has one end thereof at the right side gear 52.
And extends through the hollow portion of the forward drive shaft 42, the hollow portion of the hollow hub portion 33 of the rear wheel output side gear 32, and the hollow portion of the hollow hub portion 63 of the ring gear mount member 62. The end is splined with one end of the side gear shaft holder 78. Side gear shaft holder 7
Reference numeral 8 projects outward from an opening 80 provided in the transfer case 72, and a shaft coupling member 82 used for connecting to the front wheel is spline-coupled to the projecting end.

A tubular retainer 84 having a flange portion 86 is fitted in the opening portion 80 in a removable manner, and the retainer 84 is fitted into the opening portion 80 of the transfer case 72 at the flange portion 86.
And is removably fixed to the trough case 72 by a bolt 88. The side gear holder 78 extends through the hollow portion 85 of the retainer 84, and a cylindrical bearing 90 and an oil seal member 92 are arranged between the retainer 84 and the side gear holder 78. Further, the retainer 84 and the ring gear mount member 6
An oil seal member 94 is arranged between the two hollow hub portions 63.

At the inner part of the opening 80, the above-mentioned tapered drum roller bearing 68 is provided.
Is located, and the tapered roller bearing is a retainer 86.
A preload in the thrust direction can be given by tightening with a cup-shaped adjusting nut 96 screwed into the transfer case 72 at a deeper position.

According to the above-described structure, when the side gear holder 78 is removed, the cylindrical bearing 90 and the oil seal member 92 can be extracted together with the retainer 86 while being attached to the retainer 86, that is, the right side gear holder 78 and the right side gear holder 78. The cylindrical bearing 90 and the oil seal member 92 can be pulled out from the opening 80 of the transfer case 72 as a combined assembly, and this assembly can be inserted into the opening 80 of the transfer case 72 as it is. As a result, the projecting portion of the side gear shaft can be disassembled and assembled with good workability, and the cylindrical bearing 90 and the oil seal member 92 are removed from the side gear holder 78 each time the disassembly and assembly are performed. There is no need to pull it out and plug it in again. I fear there is no damage in La.

Further, as described above, as the protruding portion of the side gear shaft is disassembled and assembled with good workability, the tapered roller bearing 68 of the tapered roller bearing 68 is adjusted by adjusting the tightening degree of the adjusting nut 92 in the inner portion of the opening 80. Preload reconditioning and servicing can be performed at each stage with good workability.

In the above, the present invention has been described in detail with reference to specific embodiments, but the present invention is not limited to these.
It will be apparent to those skilled in the art that various embodiments are possible within the scope of the invention.

[Brief description of drawings]

FIG. 1 is a skeleton diagram showing an example of a four-wheel drive transfer device incorporating a side gear shaft projecting structure of a differential device according to the present invention, and FIG. 2 is a side gear shaft projecting structure of a differential device according to the present invention. FIG. 4 is a cross-sectional view showing a specific example of a four-wheel drive transfer device including the above. 10 ... Internal combustion engine, 12 ... Automatic transmission for vehicle, 14 ...
... output shaft, 16 ... output gear, 20 ... four-wheel drive transfer device, 22 ... center differential device, 24 ... input gear, 26 ... differential case, 28 ... spider, 30 ... differential pinion, 32 ... rear wheel output side gear, 33 ... hollow hub portion, 34 ... front wheel output side gear, 36 ... rear wheel output gear, 38 ... rear wheel drive gear, 40 ... rear wheel drive shaft, 42 ... front wheel drive shaft, 44 ... front differential device, 46 ... differential case, 4
8 ... Spider, 50 ... Differential pinion, 52 ... Right side gear, 54 ... Left side gear, 5
6 ... right side gear shaft, 58 ... left side gear shaft, 60
...... Differential control clutch, 62, 64 ……
Ring gear mount member, 66 ... Bolt, 68, 70
... Tapered roller bearing, 72, 74 ... Transfer case, 76 ... Side gear intermediate shaft, 78 ... Side gear holder, 80 ... Opening portion, 81 ... Opening end face, 82
...... Shaft coupling member, 84 …… Retainer, 85 …… Hollow part,
86 ... Flange, 88 ... Bolt, 90 ... Cylindrical bearing, 92, 94 ... Oil seal member, 96 ...
… Adjusting nut

Claims (1)

[Claims] 1. A differential side gear shaft (56) projecting outward from an opening (80) of a differential housing (72), wherein said differential side gear shaft (56) is a side gear intermediate shaft. (76) and the shaft coupling member (82) are axially butted against each other at their splined ends and spline-coupled with a hollow side gear holder (78) having a splined inner peripheral surface. A cylindrical retainer (84) including a structure is detachably attached to the opening (80) of the differential housing (72), and an oil seal is provided between the retainer (84) and the side gear holder (78). A side gear shaft of a differential device characterized in that a structure (92) and a bearing member (90) are incorporated. Out section structure.