JPH03505A - Tread adjuster for drive axle - Google Patents

Abstract

PURPOSE:To prevent the lowering of strength at the time of tread adjustment, by fitting at fixed frames which have a built-in drive shaft and which are protrudingly provided right and left outward from a transmission case, expansion /contraction frames which have a built-in driven shaft and which are expandale/ contractable inwardly and outwardly, and arranging so that expansion/ contraction positioning frames may be put over fixed frames and expansion/ contraction frames and be fixed. CONSTITUTION:Motive power transmitted to a transmission case 3 is distributed right and left, and transmitted to a drive shaft 1 by means of transmission gears 14, 15 (The left side alone is shown in the drawing.). A tread adjustment is done by adjusting expandingly and contractingly the pipe portion 5a of an expansion/contraction frame 5 against the tubular portion 2a of a fixed frame 2, and by conducting positioning and fixing by means of the adjustment hole 20 of a positioning frame 6 and a tightening tool which is not shown in the drawing. As a result, the fixed frame and the expansion/contraction frame are reinforced by means of the positioning frame 6, and the lower of strength can be prevented even if the breadth of a tread is changed widely.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a tread adjustment device for a drive axle.

This invention applies to tractors, combines, construction machinery, etc.
The present invention relates to a tread adjustment device for a drive axle that adjusts the tread of a vehicle traveling on rough terrain without reducing its strength.

[Prior art and problems to be solved by the invention] Conventional
The tread adjustment device for tractors, combine harvesters, construction machinery, etc. is simply provided with a double-overlapping pipe section that is horizontally slidable in the middle of the axle, and the amount of overlap of this pipe section is adjusted by expanding and contracting. However, this type of tread adjustment device had a problem in that when the tread was widened, the amount of overlap between the pipe portions decreased, resulting in a sharp drop in axle strength.

[Means for Solving Problem A] The present invention attempts to solve the above-mentioned problems of the conventional device, and takes the following technical measures.

That is, fixed frames 2, 2 each having a drive shaft 1 therein are protruded from the transmission case 3 toward the right and left sides, respectively, and are expanded and contracted in the inner and outer directions along the fixed frames 2, and the driven shaft 4 is mounted inside the fixed frames 2, 2. The tread adjustment device for a drive axle is characterized in that the provided telescopic frame 5 is attached to a fixed frame 2, and the outer side of both the fixed frame 2 and the telescopic frame 5 is fixed in the telescopic position with a positioning frame 6.

[Effects of the Invention] With the above-described configuration, the present invention provides the following technical effects. That is, since the outside of both the fixed frame 2 and the telescopic frame 5 is covered with the positioning frame 6 to fix the telescopic position, even when the tread is extended to widen the ground contact width between the drive shafts, the tread is retracted and the drive is continued. Even when the ground contact width between the wheels is narrowed, the entire axle can be reinforced in the same way with this positioning frame 6.

[Examples] Examples of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the component parts described in this example are not intended to limit the scope of this invention to only those, unless there is a specific description. , is merely an illustrative example.

This invention is folded into the tread adjustment section of the rear wheel 8 section of the A tractor 7.

The agricultural tractor 7 includes left and right main frames 9, 9 that are long and have a constant width in the longitudinal direction of the machine body, a transmission case 3 attached to the rear of the main frame 9, and a prime mover 10 and a front axle 11 attached to the front of the main frame 9. , 11 and rear wheels 8, 8 are the main components.

The transmission case 3 has a fixed frame 2 protruding toward the left and right outer sides, respectively.

The outermost end of the fixed frame 2 is a cylindrical portion 2a, and a drive ml is provided approximately at the center of the cylindrical portion 2a.

The drive shaft 1 is a hollow shaft, and has a spline hole-shaped engagement portion 1a on its inner surface.

Inside the cylindrical portion 2a of the fixed frame 2, the cylindrical portion 5a of the telescoping frame 5 is overlapped.

A driven shaft 4 is located approximately at the center of this cylindrical portion 5a, and is a spline shaft that is attached to the engaging portion 1a of the aforementioned drive shaft 1 while freely expanding and contracting in the axial direction and meshing in the driving direction. .

The radial relationship between the spline shaft, the hole, and the telescopic cylinder may be reversed.

The telescopic frame 5 is deviated downward, and an axle 12 is provided at the bottom of the telescopic frame 5 to protrude outward, and a wheel disc 13 of the rear vehicle 11Q8 is fastened to the axle 12 with a fastener (not shown). There is.

The fixed frame 2 and the telescopic frame 5 are transmission boxes, and transmission gears 14, 15, 16, 17, and 18 are incorporated therein, respectively.

As described above, the fixed frame 2 and the telescopic frame 5 are expandable and retractable in the width direction using the cylindrical portion 2a and the cylindrical portion 5a, and the positioning frame 6 is attached to the outer portion thereof.

The positioning frame 6 is a U-shaped member with a downward opening, and its base end is fitted with fasteners 19, 19. , are tightened and fixed to the front and rear surfaces of the fixed frame 2. In addition, axial adjustment holes 20, 2 are provided on the other end side.
0. , , and fasteners 21.21. , are fixed to the front and rear surfaces of the telescopic frame 5 so as to be adjustable in the axial direction.

FIG. 4 is a separate drawing example in which left and right pillars 22, 22 are provided upwardly protruding from the base end of the positioning frame 6, and a roof 23 shown in FIG. 5 is attached to the top of these pillars. A safety frame 24 is used.

Next, the effect of rotation will be explained.

The driving force of the prime mover 10 reaches the transmission case 3 at the rear of the fuselage via various power transmission devices.

After passing through a transmission section (not shown) in the transmission case 3, one of the power distributed to the left and right by an actuating device (not shown) reaches the drive shaft 1 from the transmission gears 14 and 15.

A cylindrical portion 2a of a fixed frame 2 is located on the outer periphery of the drive shaft 1, and a cylindrical portion 5a of a telescoping frame 5 is fixed to this cylindrical portion 2a by a positioning frame 6 so as to be freely adjustable. adjustment holes 20, 20. , , fasteners 21.21. After removing , adjust the telescopic frame 5 with respect to the fixed frame 2, and tighten the fasteners 21,
21. , and then adjust the tread.

The power of the drive shaft 1 is transmitted from the driven shaft 4 to the transmission gear 16°17.
18 to reach the axle 12 and drive the rear wheel 8.

In this way, the present invention allows the fixed frame 2 to be fixed after changing the tread.
Since both the telescopic frame 5 and the telescopic frame 5 are firmly reinforced and fixed by the positioning frame 6, deformation due to the load between the cylindrical portion 2a and the cylindrical portion 5a can be prevented even if the tread is changed widely. Further, since the positioning frame 6 prevents movement in the axial rotation direction between the cylindrical portion 2a and the cylindrical portion 58, a conventional rotation preventing member such as a locking pin is unnecessary.

[Brief explanation of the drawing]

The figure shows one embodiment of the invention. Fig. 1 is a rear sectional view of the main part, Fig. 2 is a partially sectional rear view, Fig. 3 is a side view of the main part, Fig. 4 is a partially sectional rear view of another example, and Fig. 5 is a partially sectional rear view of the main part. It is an overall side view. In the figure, 1 is a drive shaft, 2 is a fixed frame, 3 is a transmission case,
4 is a driven shaft, 5 is a telescopic frame, and 6 is a positioning frame.

Claims (1)

[Claims] (1) Fixed frames 2, 2 each having a drive shaft 1 therein are protruded from the transmission case 3 toward the right and left sides, respectively, and extend and contract in the inner and outer directions along the fixed frames 2, and the driven shaft 1 is provided inside the fixed frames 2, 2. This tread adjustment device for a drive axle is characterized in that a telescoping frame 5 provided with a telescoping frame 5 is attached to a fixed frame 2, and the outer side of both the fixed frame 2 and the telescoping frame 5 is fixed in the telescoping position with a positioning frame 6.