JPH01312904A - Setting device of lower link - Google Patents

Abstract

PURPOSE:To improve sustaining ability of transmission case by providing setting parts of pins connecting lower link on outside wall of mission case side and inside wall of transmission case and dispersing a part of force applied on the transmission case to mission case side. CONSTITUTION:A transmission case 15 bearing wheel shaft 20 is set in capable of rocking around core of wheel pinion shaft 17 and setting parts of pins connecting lower link are provided on outside wall of mission case 6 side and inside wall of transmission case 15. Therefore, a force applied on the transmission case 15 is dispersed to mission case 6 side and sustaining ability is improved. Plural setting parts having the center at core of wheel pinion shaft 17 are provided. Then, pivoting position of lower link 9 is able to be set on almost constant position independent of revolving position of the case 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lower link attachment device for a tractor or the like.

[Prior art] In a tractor that changes the ground clearance by swinging the transmission case that supports the wheel shaft of the tractor around the axis of the wheel and pinion shaft, when the transmission case is fixed after rotation adjustment. However, the rear axle housing is simply fastened around the rotating portion of the rear axle housing via fasteners such as bolts. In addition, not only for this type of tractor but also for general tractors, when installing the lower link, two opposing plates are fixedly attached to the rear lower part of the rear axle housing, and the lower link is installed between these plates. The front end of the link is inserted and the lower link is pivotally supported from the side with a pin.

[Problems to be Solved by the Invention] By the way, when the above-mentioned transmission case is fixed to the rear axle housing only by tightening bolts around the rotational pivot portion, there is a drawback that the mounting strength of the transmission case is weak.

[Means for Solving the Problems] The present invention is proposed in view of the above-mentioned problems, and includes increasing the mounting strength of the transmission case that pivotally supports the wheel shaft, and improving the mounting strength of the front end of the lower link. It is an object of the present invention to provide a lower link mounting device that is compact overall and easy to handle, such as attachment and detachment, by providing the lower link attachment device at a rational location. For this reason, the present invention has taken the following technical measures. That is, the transmission case 15 which pivotally supports the wheel shaft 20 is attached so as to be swingable around the axis of the wheel pinion shaft 17, and the attachment part of the lower link 9 connecting pin 25 is connected to the outer wall part on the mission case 6 side. The structure of the lower link mounting device is characterized in that it is provided on the inner wall of the transmission case 15.

[Example] Hereinafter, the present invention will be described in detail based on the drawings.

First, to explain the configuration, 1.1 is a tractor that has front and rear wheels 2, 2, 3, 3 at the front and rear of the machine body, an engine 4 mounted on the front of the tractor 1, and a clutch connected to the rear of the engine 4. The body is composed of a housing 5, a transmission case 6 connected to the rear of the clutch housing 5, and the like. A hydraulic cylinder case 7 is placed on the upper part of the transmission case 6, and lift arms 8.8 are rotatably pivoted on both left and right sides of the hydraulic cylinder case 7.

9.9 is lower link, 10.10 is lift arm 8.8
This is a lift arm that connects the lower links 9, 9. In addition, a rear axle housing 12° 12 is attached to the rear left and right sides of the mission case 6.
This rear axle housing 12.
A transmission case 15.15, which will be described later, is rotatably fitted into the transmission case 12. 16 is a differential gear, 17 is a wheel pinion shaft, and 18 is a disc brake.

Note that since the structures of the support portions of the left and right transmission cases 15.15 are the same, only one side will be described below. The axis of the wheel pinion shaft 17 and the swing center of the transmission case 15 coincide with each other, and one end of the wheel pinion shaft 17 and the wheel shaft 20 are pivotally supported by the transmission case 15. The wheel pinion 21 on the wheel pinion shaft 17 and the large diameter gear 22 on the wheel shaft 20 are always in mesh with each other, so that reduced rotation is applied to the wheel shaft 20. This transmission case 15 supporting the wheel shaft 20 and the rear axle housing 1
A certain space 23 is interposed between 2 and 2, and this space 23
The pin 25 for connecting the lower link 9 is inserted into the lower link 9 and attached to the lower link 9.

As shown in FIG. 2, a screw hole 26 is provided in the outer wall 12a of the rear axle housing 12, into which the pin 25 is screwed. Further, on the opposite side of the pin 25, a plate 27 having through holes 28, 28 is integrally fixed.

On the other hand, the inner wall portion 15a on the side of the transmission case 15 is an arc whose radius is a line segment that is centered around the axis of the wheel pinion shaft 17 and connects the axis of the wheel pinion shaft 17 and the center of the through hole 28. Multiple screw holes 30 on the top
. . . are provided, and after matching these screw holes 30 . . . with the through holes 28, 28, the pin 25 and the transmission case 15 are connected and fixed from the inside with bolts 31, 31. . In the figure, reference numeral 32 is a drive pinion shaft, 33 is a PTO shaft, and 35... is a transmission case 15.
Bolts 37 are collars for fixing the rear axle housing 12 to the rear axle housing 12.

In this embodiment, explanation of the specific structure of the method for adjusting the ground height of the front axles 2, 2 has been omitted, but for example, there may be a method of vertically inverting the final gear case supporting the front wheel wheel shaft, or a method of adjusting the ground height of the front axles 2, 2, etc. There is a method of forcibly sliding the final case in the vertical direction using a forced drive means. With this method, the front shaft 2,
After adjusting the ground height in step 2, when adjusting the ground height of the rear axle 3.3, first remove the bolts 35 that fix the transmission case 15 to the rear axle housing 12, the plate 27, and the transmission case. 15, remove the bolts 31, 31 connecting them, swing the transmission case 15 appropriately around the axis of the wheel pinion shaft 17, adjust the ground clearance, and then tighten the bolts 31, 31, 35... again. Tighten to secure this. In this case, as described above, the fixation of the transmission case 15 after the rotation adjustment is performed using the bolts 35.
Not only that, the transmission case 15 and the rear axle housing 12 are firmly connected via the pin 25 that supports the lower link 9, so the holding strength of the transmission case 15 is significantly increased, and the pin 25 is connected to the transmission case 15. Since it is attached so as to face the space 23 between the rear axle housing 12 and the rear axle housing 12, damage and deformation due to contact with other objects can be prevented.

[Effects of the Invention] Since the present invention is configured as described above, it has the following technical effects.

That is, the transmission case 1 that pivotally supports the wheel shaft 20
5 is swingably mounted around the axis of the wheel pinion shaft 17, and the mounting portions of the lower link connecting pin 25 are provided on the outer wall portion on the transmission case 6 side and the inner wall portion of the transmission case 15.

The force applied to the transmission case 15 is dispersed to the transmission case 6 side, and the holding ability of the transmission case 15 is greatly improved.

Furthermore, by providing a plurality of attachment parts centered on the axis of the wheel pinion shaft 17 on the inner wall of the transmission case 15, the pivot position of the lower link 9 can be substantially fixed regardless of the rotational position of the transmission case 15. -It is now possible to set it in a fixed location,
It is possible to solve problems such as interfering with the traction performance of the working machine connected to the rear of the tractor and making it difficult to match the working machine with the main machine.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is an overall side view, FIG. 2 is a sectional view of a main part, and FIG. 3 is a partially cutaway view taken along arrow A in FIG. Explanation of symbols l Tractor 2 Front axle 3 Rear wheel 9 Lower link 15 Transmission case 17 Wheel pinion shaft 20 Wheel shaft representative Masafumi Iseki

Claims (1)

[Claims] 1. Transmission case 15 that pivotally supports the wheel shaft 20
is attached so as to be swingable about the axis of the wheel pinion shaft 17, and the mounting portions of the lower link 9 connecting pin 25 are provided on the outer wall portion on the transmission case 6 side and the inner wall portion of the transmission case 15. Lower link mounting device. 2. The lower link according to claim 1, wherein the inner wall of the transmission case 15 is provided with a plurality of attachment portions centered around the axis of the wheel pinion shaft 17 in order to attach the connection pin 25. Mounting device.