JPH03231078A - Crawler traveling device for working vehicle - Google Patents

Abstract

PURPOSE:To suppress the sudden change of attitude of a machine body in getting over a levee, etc. by connecting a grounded rolling wheel at the most front edge and a grounded rolling wheel in the vicinity of the center of gravity of the machine body, in seesaw swingable manner around the supporting shaft of a grounded rolling wheel positioned between the above-described both grounded rolling wheels. CONSTITUTION:As for a crawler traveling device 2, a rubber crawler 17 is wound over the driving sprocket 13 of a traveling mission, driven sprocket 15 of a truck frame 14, and a plurality of grounded rolling wheels 16. In this case, a grounded rolling wheel 16a at the most front edge and a grounded rolling wheel 16c in the vicinity of the center of gravity of the machine body among the grounded rolling wheels 16 are connected in seesaw swingable manner through a rolling wheel frame 18, having the supporting shaft 19 of the grounded rolling wheel 16b in an intermediate part as center. Further, the rolling wheel frame 18 is urged downward by the front and rear springs 20 in pairs. Accordingly, each grounded rolling wheels 16a, 16c is raised and lowered according to the unevenness of a road surface, and the sudden change of the attitude of the machine body in getting over a levee can be suppressed with the simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a crawler traveling device for a work vehicle such as a combine harvester or a transport vehicle.

[Conventional technology]

Conventionally, among the ground contact wheels of a crawler traveling device, at least the frontmost one has been a fixed roller fixed to a truck frame (see, for example, Japanese Utility Model Application Publication No. 1-74733).

[Problem to be solved by the invention]

When going over a convex part or ridge in the field, if the front of the crawler goes over the ridge, the machine will suddenly stand up, and if the center of gravity of the machine passes the front of the ridge, the machine will suddenly lean forward, making the ride uncomfortable and unstable. It lacked sex.

The purpose of the present invention is to make it possible to suppress sudden changes in attitude of the aircraft when crossing ridges, etc. by devising a wheel support structure, and to make the structure for this purpose simple. shall be.

[Means to solve the problem]

The characteristic configuration of the present invention for achieving the above object is to replace the frontmost ground contact wheel and the ground contact wheel near the center of gravity of the machine among the ground contact wheels of the crawler traveling device with a ground contact roller located between these. The wheels are connected to each other so that they can swing freely around the spindle of the wheels, and this structure provides the following functions and effects.

[For production]

Figure 2 (<), (As shown in II, convex parts of the field,
Alternatively, when climbing over a ridge, the frontmost wheel rises due to the ground reaction force, so the angle of inclination of the front part of the crawler to the ground becomes gentler, the aircraft gradually rises by 1oS, and a sudden rise is suppressed. When the center of gravity of the aircraft approaches the front of the ridge, the wheel near the center of gravity of the cane rises, and together with this, the wheel at the front end that can swing freely on the seesaw lowers, causing the aircraft to gradually move forward. This will lower the aircraft and bring it to the front, suppressing the sudden change in attitude of the aircraft after its center of gravity passes through the front of the ridge and rests. It is possible to ride comfortably and safely over ridges and ridges, and the structure for this purpose is a structure that connects the frontmost roller and the roller at the center of gravity so that the seesaw can swing freely, and the seesaw's swing axis is connected to these two wheels. There is an advantage that the structure can be implemented as a simple structure by also using the support shaft of the roller located in the middle of the roller.

〔Example〕

Embodiments of the present invention will be described below with respect to a crawler traveling device for a combine harvester, which is an example of a work vehicle.

As shown in Figure 2, a pair of left and right crawler running equipment equipped with a threshing device (1)! (2) A pre-processing device (6) equipped with a moving device (3), a reaping device (4), and a vertical conveyance device (5) is arranged at the front of (2) to form a combine harvester. .

As shown in FIG. 3, the crawler traveling device (2) can change the traveling speed to low, medium, or high speed via the transmission device (8) of the traveling machine (7). It is configured to be capable of turning operation via a pair of steering flanges (9), (9).

As shown in FIG. 4, the traveling transmission (8) includes transmission gears (8a), (8b), (8c) on the drive side, and transmission gears (8a'), (8b') on the cover side. , (8
c') is a type of transmission in which gears are always engaged, and the support shaft supporting the driven side transmission gears (8ai, (8b'), (8c') is slid by a traveling transmission lever (11). Therefore, each ball detent mechanism (12a), (12b), (12C) of the support shaft (10) is operated at low speed.
Medium speed/high speed driven side transmission gear (8a'), (
8b') and (8c'), the gears can be changed by selectively engaging the gears 8b') and 8c'. Further, the ball detent mechanisms (12a), (12b), (12
The ball hole on the gear side c) is formed in an egg shape in the axial direction.

As shown in FIG. 1, the crawler traveling device (2) includes a driving sprocket (13) of a traveling mission (7), a passive sprocket 7) (15) attached to a truck frame (14), and a driving sprocket (13) of a traveling mission (7).
), and a rubber crawler (17) is wound around a plurality of ground contact wheels (16). , the ground contact wheel (16c) near the center of gravity position (G) of the machine can see-saw around the spindle (work 9) of the intermediate ground contact wheel (16b) via the wheel frame (18). It is configured. In addition, the wheel frame (18) is supported by a pair of front and rear springs (2
0), (20).

Embodiment C] As shown in FIG. 5, a hydraulic cylinder (2
1) is installed and the cylinder (
21) may be configured to extend with the operation of the left and right steering wheel when the aircraft turns, thereby making it easier for the aircraft to turn using its ground contact wheel (16c) as a fulcrum.

[Brief explanation of drawings]

The drawings show an embodiment of the crawler traveling device for a working vehicle according to the present invention, FIG. 1 is a side view of the crawler traveling device, FIG. 2 (V),
((1) is a side view of the combine harvester showing the ridge crossing state, FIG. 3 is a schematic diagram of the traveling transmission, FIG. 4 is a sectional view of the traveling transmission, and FIG. 5 is a side view of another embodiment.) 2)... Crawler traveling device, (16)...
... Ground contact wheel, (16a) ... Ground contact wheel at the front end, (16b) ... Ground contact wheel at the middle part, (1
6c)... Ground contact wheel at center of gravity position, (19)--
...Spindle.

Claims (1)

[Claims] Among the ground contact wheels (16) of the crawler traveling device (2), the frontmost ground contact wheel (16a) and the ground contact wheel (16c) near the center of gravity of the machine are replaced by a ground contact wheel (16c) located in the middle thereof. 1
6b) A crawler traveling device for a work vehicle, characterized in that the crawler traveling device for a work vehicle is connected so as to be swingable in a seesaw manner around a support shaft (19).