JPH0776233A - Shaft supporting structure for transmission part - Google Patents

Abstract

PURPOSE:To facilitate the mounting/demounting operation of a carrier onto an axle by bolt- fixing a large diameter flange for regulating the shift of a revolution member to the second revolution shaft, at the second revolution shaft side end of the first revolution shaft, forming a shaft part having the smaller diameter than the screw head part between the screw head part of the bolt and the large diameter flage, and externally fitting the stop member freely at the shaft part. CONSTITUTION:As for the shaft supporting structure for a transmission part, the first revolution shaft 6 and the second revolution shaft 9 having the some revolution axis center to that of the first revolution shaft 6 are oppositely arranged in abutment, and a revolution member 10 in a positioned state in the axis center direction is externally fitted at the second revolution shaft 9 side end of the first revolution shaft 6, and a stop member 15 for regulating the shift of the second revolution shaft 9 to the first revolution shaft side is installed on the first revolution shaft 6. A large diameter flange 13a for regulating the shift of the revolution member 10 to the second revolution shaft 9 side is fixed by a bolt 14 at the second revolution shaft 9 side end of the first revolution shaft 6, and a shaft part 13b having the smaller diameter than a screw head part 14a is formed between the screw head part 14a of the bolt 14 and the large diameter flange 13a, and the fixing member 15 is externally fitted freely on the shaft part 13b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft support structure suitable for a work machine such as a wheel loader or a tractor, or a transmission section of a self-propelled vehicle or the like.

[0002]

2. Description of the Related Art For example, as shown in FIG. 5, a transmission structure of a rear axle portion of a wheel loader has a planetary deceleration between a differential output shaft 9 which is an output shaft of a differential mechanism and an axle 6 which supports rear wheels. The mechanism 4 is configured so that the differential output shaft 9 and the axle 6 are disposed in abutting and opposed relation to each other. Then, the carrier 10 supporting the planetary gear 11 is mounted on the inner end of the axle 6 by a pair of left and right retaining rings 16 and 16 in an integrally rotating state, and
The differential output shaft 9 is restricted from moving to the outside by abutting the washer 15 mounted on the inner end of the axle 6 with the bolt 14 and the collar 13.

[0003]

In the above conventional structure, the planetary gear bearing portion of the carrier 10 attached to the end of the axle is located largely inward from the axle 6, and the inner retaining ring 16 is recessed. It was difficult to carry out the loading and unloading operation when it was located. An object of the present invention is to improve the structure of the abutting portion of the axle and the differential shaft so that the carrier can be easily attached to and detached from the axle while maintaining necessary functions.

[0004]

In order to achieve the above-mentioned object, the present invention is directed to a first rotary shaft (axle) and a second rotary shaft (differential shaft) having the same rotary shaft center but facing each other. The rotary member (carrier) is externally fitted to the second rotary shaft side end of the first rotary shaft in a state of being positioned in the axial direction, and the second rotary shaft is mounted on the first rotary shaft side. In the shaft support structure of the transmission part, in which a stop member for restricting movement is provided on the first rotation shaft, a large-diameter flange for restricting movement of the rotation member toward the second rotation shaft is used for the second rotation of the first rotation shaft. While bolting to the shaft side end, set the large diameter flange and the bolt shape so that a shaft part with a diameter smaller than the screw head is formed between the screw head and the large diameter flange of this bolt. However, the stop member is loosely fitted on the shaft portion.

[0005]

Describing with reference to FIG. 1, the flange collar 13 is fixed to the inner end of the axle 6 by the bolt 14, and the large-diameter flange 13a regulates the inward movement of the carrier 10. A thrust washer 15, which is a stopper member, is loosely fitted to the shaft portion 13b of the flange collar 13, and contact with the thrust washer 15 can restrict outward movement of the differential output shaft 9. Therefore, instead of the conventional cumbersome operation of attaching and detaching the inner retaining ring to the end of the axle 6 using the snap ring attaching / detaching tool, the bolt 14 is attached / detached using a bolt operating tool such as a T wrench or a screwdriver. Carriers can be assembled and removed with simple operations.

Conventionally, four parts of a retaining ring, a thrust washer, a collar, and a bolt are required at the end of the axle, but according to the present invention, three parts of a flange collar, a thrust washer, and a bolt are sufficient. The number of parts can be reduced.

[0007]

As a result, by reviewing the structure at the shaft end,
It was possible to improve the assemblability and maintainability by eliminating the troublesome attachment / detachment operation of the retaining ring without impairing the movement restriction function of the shaft and the rotating member. Further, it is possible to reduce costs by reducing parts.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings for a transmission portion of a wheel loader. FIG. 3 shows a part of the transmission structure for the rear wheels, where 1 is a differential mechanism, 2 is a differential case, 3 is an axle case, 4 is a planetary reduction mechanism, 5 is a brake, and 6 is a rear axle. A mounting flange 7 is attached to the input shaft 1a of the differential mechanism 1, and a universal joint 8 is provided between the transmission shaft (not shown) that receives engine power and the mounting flange 7.

As shown in FIG. 1, the planetary speed reduction mechanism 4 extends over a differential output shaft (corresponding to a second rotating shaft) 9 and a rear axle (corresponding to a first rotating shaft) 6 of the differential mechanism 1. It is composed of. That is, a carrier (corresponding to a rotating member) 10 is spline fitted onto the inner end of the rear axle 6, and the carrier 10
A plurality of planetary gears 11 which are idled and supported by a gear unit 9a formed on the outer end of the differential output shaft 9 are engaged with each other, and a ring gear 12 which is internally engaged with the planetary gears 11 is engaged.
Is provided in a state of being a connecting case that indirectly connects the differential case 2 and the axle case 3. The axis P of the differential output shaft 9 coincides with the axis of the rear axle 6.

A flange collar 13 is provided on the inner end of the rear axle 6.
Are attached with bolts 14, and this flange collar 13
The shaft portion 13b has a large diameter flange portion 13a and a bolt 14
The thrust washer 15 is idly supported while being sandwiched between the rib portion (corresponding to the screw head portion) 14a. That is, the carrier 10 is axially positioned with the retaining ring 16 restricting outward movement and the large-diameter flange portion 13a restricting inward movement, and the differential output shaft 9 is
The thrust washer (corresponding to a stop member) 15 is used to regulate the outward movement, and the output gear 1c that bevel-engages with the differential gear 1b is used to regulate the inner movement.

Further, a plurality of outer disks 18 supported by a pin shaft 17 provided over the ring gear 12 and the differential case 2, and a plurality of inner disks 19 bite-mounted on the gear portion 9a of the differential output shaft 9, Also, the piston 20 supported by the differential case 2 constitutes a hydraulic multi-plate brake 5.

As shown in FIG. 2, on the inner circumference of the lid case 2a that covers the extraction portion of the input shaft 1a of the differential case 2,
The seal ring 21 having an inner peripheral sliding structure that comes into contact with the outer periphery of the mounting flange 7 is mounted, and the mounting flange 7
A seal ring 22 having an outer peripheral sliding structure that comes into contact with the inner periphery of the front end of the lid case 2a is attached to the outer periphery of the recessed processed portion on the outer periphery of the mounting flange 7. With this double seal structure, the function of preventing the intrusion of mud and foreign matter and the leakage of lubricating oil is further ensured.

[Other Embodiment] As shown in FIG. 4, the rear axle 6
Secure the washer 13a to the end with the stepped bolt 14,
The thrust washer 1 is attached to the step shaft portion 13b of the stepped bolt 6.
A structure for allowing the idle support 5 to support the carrier 10 and the differential output shaft 9 may be provided. The rotating member 10 may be a gear, a brake disc, or the like in addition to the carrier, and these are collectively referred to as a "rotating member".
In addition to the so-called flanged bolt shown in this embodiment, the bolt 14 may be a general hexagonal bolt or screw without a flange, and these are collectively defined as "bolts".

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure of a planetary speed reduction mechanism portion.

FIG. 2 is a sectional view showing a seal structure of a differential input shaft portion.

FIG. 3 is a sectional view showing a structure for transmitting power to a rear axle.

FIG. 4 is a sectional view showing another structure of the inner end portion of the rear axle.

FIG. 5 is a cross-sectional view showing the structure of a conventional rear axle inner end portion.

[Explanation of symbols]

 6 1st rotating shaft 9 2nd rotating shaft 10 Rotating member 13a Large diameter flange 13b Shaft part 14 Bolt 14a Screw head 15 Stopping member

Claims (1)

[Claims] 1. A first rotary shaft (6) and a second rotary shaft (9) having the same rotary shaft center as the first rotary shaft (6) are butted and opposed to each other,
The rotary member (10) is externally fitted to the end of the first rotary shaft (6) on the second rotary shaft side while being positioned in the axial direction, and the first rotary shaft (9) has a first rotary shaft (9). A shaft supporting structure of a transmission part, which comprises a stop member (15) for restricting movement toward the rotating shaft side, in the first rotating shaft (6), the rotating member (10) extending toward the second rotating shaft side. A large-diameter flange (13a) that restricts the movement of the bolt (14) to the end of the first rotary shaft (6) on the second rotary shaft side, and a screw head (14a) of the bolt (14). The large diameter flange (13a) and the bolt (14) are respectively formed so that a shaft portion (13b) having a diameter smaller than that of the screw head portion (14a) is formed between the large diameter flange (13a) and the large diameter flange (13a). A shaft of a transmission part having a shape set and the stopper member (15) loosely fitted to the shaft part (13b). Support structure.