JPS6236701Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a self-propelled agricultural work vehicle such as a combine harvester,
The present invention relates to an idler wheel support device in a crawler device for various civil engineering vehicles.

The present invention provides an idle wheel support device of this type.
The purpose is to easily change the mounting position of the idler wheel vertically and adjust the ground contact angle of the crawler section from the final roller to the idler wheel to obtain good running performance according to the conditions of the work site. It is something to do.

This device has a pair of left and right idler support shafts that protrude horizontally and forward of the aircraft in parallel to an idler metal for supporting an idler wheel, at a position offset downward from the support shaft of the idler wheel, and a pair of left and right support cylinders that can be selectively fitted and supported with either of the pair of left and right idler support shafts are provided on the track frame, so that the vertical position of the support shaft of the idler wheel can be freely changed in two stages by shifting the idler wheel up, down, left and right.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

FIG. 1 shows a side view of the combine harvester, in which a thresher B is mounted on a stand 9 supported by track frames 7 of a pair of left and right crawler devices A, and a hoisting case is mounted in front of the threshing machine B. This is a general combine harvester in which a reaping section C equipped with a cutting blade 11, transport bodies 12 and 13, etc. is movable up and down by a hydraulic cylinder 14.

The crawler device A includes a rubber crawler a having lugs 15 spaced apart on the outer circumferential surface and protrusions 16 on both sides of the center of the inner circumferential surface, and a drive wheel supported on the front side of the truck frame 7. 1, four road wheels 3, 3, 3, 3 on the ground side supported by a support shaft 17 extending laterally from the lower part of the truck frame 7, and tension wheel 18 and rear idler wheel 2
The winding structure is the same as that of a known crawler device.

In the present invention, as an idler support structure for supporting the above-mentioned idler wheel 2, support plates 19a and 19b are planted and protruded on both sides of the rear part of the truck frame 7, and the support plates 19a and 19b have the following features: A pair of support tubes 8a are positioned horizontally on both sides of the truck frame 7 and parallel to each other in the longitudinal direction of the machine body.
A nut 21 is fixed to a support plate 20 which is fixedly inserted and fixed in an upright manner on the upper surface of the truck frame 7 which is the upper side of the support tubes 8a and 8b. , 8b, which stands up on the periphery of the truck frame 7. An adjustment bolt 22 is inserted into the upper part of the adjustment plate 23, which faces the front side of the truck frame 7, and the tip end of the adjustment bolt 22 is screwed into the nut 21. The idler support shafts 6a, 6b can be freely inserted into the support tubes 8a, 8b, and the ends of the idler support shafts 6a, 6b are arranged so as to contact the back surfaces of both sides of the adjustment plate 23, respectively. The rear ends of the shafts 6a and 6b are fixed to the lower front surface of the idler metal 5 and formed integrally, so that the idler support shaft 6 in the idler metal 5
A horizontal support hole 24 is formed through the upper part of the idler metal 5 above the position where a and 6b are fixed.

A boss tube 25 is formed integrally with the center of the idler wheel 2, one end of the support shaft 4 is fitted into the boss tube 25 and supported via bearings 26 and oil seals 27, a cover plate 28 is fitted onto the outer end face of the boss tube 25, the other end of the support shaft 4 is inserted into the support hole 24 of the idler metal 5, and a bolt 30 with a seat plate 29 interposed therebetween is removably screwed into the tip of the support shaft 4 so as to be fixed, but the support shaft 4 is configured so as to be removably inserted from either end of the support hole 24.

With reference to FIGS. 1 to 6, the idler support shafts 6a and 6b are positioned below the support shaft 4,
The idler wheels 2 are fitted into the support tubes 8a and 8b, respectively.
and the idler support shafts 6a, 6
When the tip of b is brought into contact with the adjustment plate 23 and the nut 21 screwed onto the adjustment bolt 22 is rotated with the crawler a hung around, the adjustment plate 23 is moved to the side of the idler wheel 2. , both idler support shafts 6a,
6b to bring the idler wheel 2 into tensioned contact with the crawler a side. In this state, as shown in FIG. The ground contact angle θ of the crawler a' portion can be set to a large value.

From this state, loosen the adjustment bolt 22 to move the idler wheel 2 away from the inner periphery of the crawler a, remove the bolt 30, temporarily remove the support shaft 4 from the support hole 24, and remove both idler support shafts 6a. , 6b from both support tubes 8a, 8b as they are, and while rotating the idler metal 5 by 180 degrees, insert both idler support shafts 6a, 6b into the other support tubes 8a, 8b, respectively. , insert the support shaft 4 into the lower support hole 24 and tighten the bolt 30.
When fixed, the idler wheel 2 can be set so as to be lowered as shown in FIGS. 8 and 9, and therefore it can be assembled so that the ground contact angle is zero.

Therefore, by changing the mounting position of the idler metal vertically and horizontally, the idler wheel 2 can be moved up and down to change and adjust the ground contact angle θ of the crawler on the idler side. The ground surface of a can be increased.

As mentioned above, in this invention, the vertical position of the idler wheel can be changed freely by replacing the support shaft with an idler metal, replacing both idler support shafts with both support cylinders, and changing the idler metal up and down. The wheels can be reliably and well supported by a pair of idler support shafts that are parallel to each other in the machine's longitudinal direction, and the height of the idler wheels can be easily changed to adjust the ground contact angle of the crawler section from the final roller to the idler wheels. be able to. Therefore, it is possible to change the center of gravity of the machine in the longitudinal direction depending on the working conditions to improve the longitudinal balance, increase the ground contact area, and improve running stability. It has the effect of being able to meet requests for modification and application to various uses (for example, dry field specifications and wet field specifications).

[Brief explanation of the drawing]

Figure 1 is a side view of the combine harvester. FIG. 2 is a side view showing a part of the crawler device equipped with the idle wheel support device of the present invention. Figure 3 is a sectional view taken along the - line in Figure 2, Figure 4 is a sectional view taken along the - line in Figure 2, Figure 5 is a sectional view taken along the - line in Figure 2, and Figure 6 is a sectional view taken along the - line in Figure 2. 7 is an exploded view of the main part, FIG. 8 is an explanatory view of the operation of FIG. 2, and FIG. 9 is a sectional view of a part of FIG. 8. A...Crawler device, a...Crawler, 1...
Drive wheel, 2... Idle wheel, 3... Rolling wheel, 4... Support shaft, 5... Idler metal, 6a, 6b... Idler support shaft, 7... Truck frame, 8a, 8
b...Support tube.

Claims (1)

[Scope of utility model registration request] An idler metal that supports the support shaft of the idler wheel in a replaceable manner is provided, and a pair of left and right idler support shafts are set parallel to each other in a downwardly offset position with respect to the support shaft of the idler metal, facing horizontally and toward the front of the aircraft. The idler support shafts are configured such that each of the pair of left and right idler support shafts can be fitted and supported in a pair of left and right support tubes that protrude from the track frame and are laterally arranged in parallel with each other, so that the relative position in the vertical direction with respect to the support shaft can be freely selected. An idler wheel support device in a crawler device.