JPH0552241A - Axle driving device for tractor - Google Patents

Abstract

PURPOSE:To prevent the loosening of the brake application tightness by preventing the outward slip-off in the axial direction of a differential gear output shaft. CONSTITUTION:The axle driving device of a tractor is equipped with a brake device 4 and a final deceleration device 5 between the differential gear output shaft 3 of a differential gear device and an axle 31. In this case, a ball bearing 35 is installed on the differential gear output shaft 3, and in order to receive the outward thrust force in the axial direction of the differential gear output shaft 3, the contact part 30A of the ball bearing 35 is formed on the support 30 of the final deceleration device 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle drive device for a tractor and is used for a rear axle or the like.

[0002]

2. Description of the Related Art The rear axle of a tractor is the final power transmission that transmits the power transmitted by the transmission to the rear wheels, and is composed of a differential device (differential gear device), a diff lock, a final reduction gear, etc. After reducing the power transmitted from the bevel pinion shaft and bevel gear, the differential gear gives the left and right rear wheels a differential to give optimum rotation for the road surface condition and running condition at that time, and a large reduction gear is used. Slow down and rear axle
It drives the (rear wheel).

[0003]

By the way, in the above-mentioned axle drive device, the diff output shaft is operated during the diff lock operation.
There is a factor that causes the (brake shaft) to move outward in the axial direction, although this is indirect, which made the braking condition unstable due to the brake shaft slipping out.

In view of the above situation, it is an object of the present invention to prevent the brake shaft from coming off, to ensure the braking condition, and to improve safety and workability.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a tractor axle drive device having a braking device 4 and a final reduction gear 5 between a differential output shaft 3 of a diff device 2 and an axle shaft 31. In order to achieve, the following technical measures are taken. That is, according to the present invention, the ball bearing 35 is provided on the differential output shaft 3, and the support 30 of the final reduction gear 5 is mounted on the support 30 of the final reduction gear 5 so as to receive the thrust force outward in the axial direction of the differential output shaft 3. It is characterized in that the contact portion 30A is formed.

[0006]

According to the present invention, the differential output shaft (brake shaft) 3
The thrust force that tries to slip outward in the axial direction is prevented by the ball bearing 35 pressing against the abutting portion 30A of the support 30 so that the thrust force does not drop further.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, which shows the overall structure, 1 is a transmission case which is a tractor vehicle body, in which a differential device (differential device) is provided. 2 is built in and drives the rear axle (rear wheel) via a pair of left and right differential output shafts (brake shafts) 3, braking device 4 and final reduction gear 5.

The diff device 2 comprises a diff pinion gear 8 in a diff case 7 having a bevel gear 6, the gear 8 meshing with a diff side gear 9 provided on the brake shaft 3, and a bearing cylinder of the mission case 1. 10 is provided rotatably via a tapered roller bearing 11. Therefore, by engaging the bevel pinion shaft (not shown) with the bevel gear 6, the power transmitted from the transmission is reduced, and then the left and right rear wheels are adjusted by the differential side gear 9 to the road condition and running condition at that time. It is designed to perform a differential to give optimum rotation. Although the differential device is shown as a 4-pinion type in the drawing, it may be a 2-pinion type.

A diff lock 12 is provided on one side of the diff output shaft 3, and the diff lock 12 has a dog portion 13A of a diff lock shifter 13 slidably provided on the diff output shaft 3 and a cover case formed on a diff case 7. The differential case (7) and the differential output shaft (3) are integrated by engaging with the dog portion (7A) in a detachable manner. To operate the diff lock 12, the shift fork 14 engaged with the diff lock shifter 13 is slidably supported by a rod 15 rotatably supported by the mission case 1 as shown in FIG. The operating force around the rod axis is transmitted to the link 15A using a foot pedal, etc.
15B slides the shift fork 14 in the direction of arrow A against the return spring 16 so that the dog portion 13A and the dog portion 7
It is done by biting A.

In this case, by fitting the tubular collar 17 onto the shift rod 15 also as a guide of the return spring 16, the sliding amount of the shift fork 14 is regulated to prevent wear. The brake device 4 is a hydraulic disc type, and has an annular brake piston in a brake case 18 that has an oil passage 18A and is attached to the side surface of the vehicle body 1 with a bolt 19.
20 is provided, and a friction plate 22 axially juxtaposed to the boss portion 21 of the brake shaft 3 via a spline or the like and a ring-shaped plate 23 interposed between the plates are used as pistons.
The brake shaft 3 is braked by pressing and separating at 20 and the stop ring is provided on both sides of the friction plate 22 in the axial direction.
24 and 25 are provided on the spline portion of the boss portion 21 for positioning.

In the oil passage 18A, when the brake pedal is depressed, the piston of the master cylinder is pushed to increase the pressure of the brake oil, and this pressure can be sent through the equalizer. The final reduction gear device 5 is of a planetary gear type and includes a sun gear 26 formed on the brake shaft 3, a gear portion 27A meshing with the sun gear 26, and an internal gear ring.
And a plurality of planetary gears 27 having a gear portion 27B that meshes with a gear portion 28A formed in 28. The internal gear ring 28 includes a rear axle case 29 and a brake case.
18 and bolt 19 together, planetary gear
27 is supported by a gear support 30 so as to be freely rotatable.

The gear support 30 is attached to the rear axle 31 by a spline or the like, and is secured by a plate 32 and bolts 33. The rear axle 31 is mounted by a bearing 34 on the rear axle case.
Supported by 29. On the axially inner end side of the gear support 30, as shown in FIG.
A is formed on this contact part 30A.
The ball bearing 35 provided above is fitted so as to prevent the brake shaft 3 from coming out in the axial direction, and the ball bearing 35 is axially positioned by the snap ring 36.

Therefore, the gear support 30 is supported on its inner diameter side by a ball bearing 35, and the bearing 35 is supported by a thrust force (a force outward in the axial direction) acting on the brake shaft 3 by a differential or the like. 3 is prevented from coming off, and the clearance t between the brake contact surface 1A and the plate 22 or the like is prevented from becoming large, which prevents the brake from becoming loose.

Rear wheels are attached to the left and right rear axles 31, respectively, and the axles 31 are supported by a semi-floating type. Further, in the embodiment, the planetary type is shown as the final reduction gear 5, but this may be a spur gear type.
The axle may be the front axle.

[0015]

According to the present invention, the differential output shaft 3 and the axle 31
With the brake device 4 and the final speed reducer 5 interlocked with each other, a ball bearing 35 is provided on the differential output shaft 3 so that the final speed reducer 5 receives the thrust force outward in the axial direction of the differential output shaft 3. Since the contact portion 30A of the ball bearing 35 is formed on the support 30 of the differential output shaft
The release of 3 does not prevent the brakes from becoming loose, which improves safety and workability.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention.

FIG. 2 is a sectional view of a main part.

FIG. 3 is a cross-sectional view of a diff lock operating portion.

[Explanation of symbols]

 2 Differential device 3 Differential output shaft 4 Brake device 5 Final reducer 30 Support 35 Ball bearing

Claims (1)

[Claims] 1. A differential output shaft (3) and an axle (3) of a differential device (2).
In a tractor axle drive equipped with a braking device (4) and a final reduction gear (5) between (1), a ball bearing (35) is provided on the differential output shaft (3), In order to receive the thrust force outward in the axial direction of (3), the contact portion (30A) of the ball bearing (35) is formed on the support (30) of the final reduction gear (5). Tractor axle drive.