JPS589769Y2 - Front axle suspension for front wheel drive vehicles - Google Patents

Description

[Detailed description of the invention] This invention relates to the front axle suspension system of a front-wheel drive vehicle, such as a front-wheel drive tractor, and its purpose is to make it possible to adjust the backlash in the longitudinal direction due to wear of the thrust collar by a simple means. do.

When the differential device is arranged with an inner fabric carrier in the center of the front axle and this carrier is suspended on a fixed pedestal using the center pin method, the bevel crown gear of the differential device and the drive pinion that mesh with it It is common practice to provide a pair of front and rear thrust collars and use the number of intervening adjustment shims to adjust the displacement, but this adjustment shim means is extremely troublesome to adjust.

In particular, in vehicles such as agricultural and civil engineering tractors that are driven under harsh conditions, the thrust collar is subject to severe wear, and there is a need for the development of a simple adjustment means.

This idea was devised in view of the above-mentioned actual situation, and its feature is that it is suitable for vehicles in which the front axle containing the differential device is suspended in a center pin manner via a pair of front and rear support brackets. , a shaft portion protruding forward of the front axle is rotatably fitted into a bottomed front support bracket via a bearing member, and between the bottom of the front support bracket and the end surface of the shaft portion, A seat plate whose outer periphery engages with the bearing member is interposed, and an adjustment bolt that can abut the seat plate from the front side is screwed into the bottom of the front support bracket so as to be freely movable in the axial direction.

Hereinafter, a specific example of the present invention will be described in detail with reference to the drawings. In FIGS. 1 and 2, 1 is a tractor body, 2 is a pair of left and right front wheels, and 3 is a pair of left and right rear wheels.

Reference numeral 4 denotes an engine, which is mounted near the front of the aircraft body 1 and covered by a bonnet 5.

Reference numeral 6 denotes a front wheel bearing stand, which is fixed to the front lower part of the engine 4 with bolts (not shown), and has a saddle-shaped side view as shown in the second figure.

A pair of front and rear support brackets 7 and 8 are fixed to the front vehicle bearing stand 6 facing each other with bolts or the like so that they are arranged on the same axis, and the front support bracket 7 has a blind hole cylindrical shape, and the rear support bracket 8 has a cylindrical shape. It is said to be a shape.

Reference numeral 9 denotes a carrier, a differential device 10 is housed inside the carrier 9, and the carrier 9 is disposed at the center of a cylindrical front axle 11.

1. A cylindrical front axle 11 extends outward from both sides of the housing of the carrier 9, and a pair of left and right differential yoke shafts 12 are inserted through the front axle 11, as shown in FIG. The front wheels 2 are to be driven via a speed reduction device 13 shown in FIG.

The carrier 9 is suspended on a pair of front and rear support brackets 7.8 by a so-called center pin method. For this purpose, a shaft portion 15 is protruded from the front lid 14 of the carrier 9, and this shaft portion 15 is connected to the support bracket 7 with a bush 16 interposed therebetween. I support it.

Further, a bearing retainer 17 is fastened to the rear of the carrier 9 with bolts or the like, and a cylindrical boss portion 18 of the bearing retainer 17 is supported by the support bracket 8 with a bush 19 interposed therebetween.

In other words, the shaft portion 15 and the cylindrical boss portion 18 are on the same axis, forming a center pin.

20 is a drive pinion shaft, and its pinion 21 engages with a bevel gear 22 of the differential device 10.

23 is a propeller shaft, which is connected to the pinion shaft 20 via a coupling 24.

In order to adjust the engagement between the pinion 21 and the bevel gear 22, thrust collars 25, 26 are interposed between the front and rear of the carrier 90 and the front and rear support brackets 7,8.

Normally, play adjustment when the thrust collars 25 and 26 are worn is performed by intervening with shims, but in the present invention, a lock nut 27 and a headed bolt 28 are installed on the support bracket 7 facing the end surface of the shaft portion 15. The bolt 28 of the pushing means 29 is screwed on, and in the case shown, the bolt 28
does not directly contact the shaft portion 15, but a seat plate 30 having at least the same diameter as the bushing 16 is interposed.

The use of this seat plate 30 has the advantage that when replacing the bush 16, the pushing force of the bolt 28 can be applied to the bush 16 through this seat plate 30, thereby ensuring ease of removing the bush 16.

According to the specific example of the present invention configured as described above, when the power of the engine 4 is transmitted to the propeller shaft 23, the speed reduction device 13 is interlocked via the differential device 10, the differential yoke shaft 12, etc., and the front wheels 2 are driven. be done.

In addition, the shaft portion 15 of the carrier 9 disposed in the center of the front axle 11
Since the cylindrical boss portion 18 is swingably suspended on the fixed support bracket 7.8, the front axle 11 can swing in a center pin manner.

When this rocking motion and muddy water, mud, etc. enter the thrust collar 25, 26, which is a dynamic rotating part, this collar 2
5.26 is worn and looseness occurs in the front and back direction,
This causes problems in power transmission and suspension.

When such a situation occurs, by loosening the lock nut 27 and threading the bolt 28 toward the shaft portion 15, the looseness due to wear of the collars 25, 26 can be corrected or adjusted.

In particular, by providing the pushing means 29 on the front support bracket 7, its operability can be improved.

This invention is as described above, and even if backlash occurs in the front-back direction, the play can be adjusted to an appropriate level by screwing the adjustment bolt.

Moreover, since the bolt contacts the shaft through the seat plate, even if a small diameter bolt is used, it will not damage the end face of the shaft, allowing smooth rotation of the shaft. Can be maintained.

Moreover, the outer periphery of the seat plate is designed to engage the bearing member, so even though the front support bracket has a bottom, by threading the bolts during disassembly, the bearing member can be inserted through the seat plate. It has the advantage that it can be pushed out from the inside to the outside and easily removed.

[Brief explanation of the drawing]

FIG. 1 is a front view of a tractor as an example of the present invention, and FIG. 2 is an enlarged sectional view taken along line 2-2 in FIG. 1... Airframe, 2... Front wheels, 3...
・・Rear wheel, 6 ・・・Base, 7, 8 ・・・Support bracket, 9 ・・・Carrier, 10 ・・・
...Differential device, 11...Front axle, 15°18.
...Center pin (axis W), 25.26...
...Thrust collar 29... Pushing means.

Claims (1)

[Scope of utility model registration request] In a vehicle in which the front axle containing the differential device is suspended by a center pin method via a pair of front and rear support brackets, the shaft portion of the front axle that projects forward is attached to the bottomed front support bracket via a bearing member. A seat plate is rotatably fitted into the front support bracket and has an outer periphery that engages with the bearing member between the bottom of the front support bracket and the end surface of the shaft. A front axle suspension system for a front wheel drive vehicle, characterized in that an adjustment bolt that can be contacted from the front side is screwed together so that it can move forward and backward in the axial direction.