JPH1179010A - Crawler travel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb the shock caused when the crawler of a crawler travel device gets over an obstacle effectively with a coil spring and the crawler itself. SOLUTION: When a crawler 16 extended round a sprocket wheel, an idler wheel, a lower fixed roller, a lower movable roller 17 and an upper movable roller 15 gets over a smaller obstacle 18, only resultant compression of a coil spring 22 disposed between the lower and upper movable rollers 17 and 15 vertically opposed absorbs the shock at the getting-over. When the crawler 16 gets over such a larger obstacle 18 as fully compresses the spring 22, on the other hand, the lower movable roller 17 forced up by the crawler 16 presses the upper side of the crawler 16 up by way of the spring 22 and upper movable roller 15 to permit the crawler 16 and the spring 22 to absorb the shock.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler traveling device, and more particularly, to a crawler traveling device configured to absorb a shock when a work vehicle such as a combine vehicle passes over an obstacle.

[0002]

2. Description of the Related Art Conventional crawler traveling devices for work vehicles include:
For example, there is one as disclosed in JP-A-7-117735. That is, the above-described crawler traveling device 1 serves as, for example, a traveling portion of a combine, and rotates below the front drive wheel 2, the rear idler wheel 3, and the track frame 4 as shown in FIG. A crawler 6 is stretched over a plurality of lower fixed rollers 5a and 5b, which are divided into two groups, which are rotatably supported, and an upper roller 5c rotatably supported above the track frame 4. The crawler 6 meshes with gears (not shown) of the driving wheel 2 and the idler wheel 3, respectively.

[0003] A lower movable rolling wheel 7 is provided between the front lower fixed rolling wheel 5a and the rear lower fixed rolling wheel 5b. The lower movable wheel 7 is rotatably supported by the other end of a swing arm 8 whose one end is rotatably supported by the track frame 4. A coil spring 9 that constantly urges the lower movable roller 7 so as to press it against the crawler 6 is wound around a pivot shaft 8 a at one end of the swing arm 8.

In the thus configured crawler traveling device, when the driving wheels 2 are driven in the forward direction by a driving force transmitted from a transmission (not shown), the crawler 6 is driven in the forward direction, and the crawler traveling device 1 is moved. You will move forward.

[0005] Then, the crawler traveling device 1 travels forward and protrudes (obstacles) formed on a traveling surface such as a ridge.
When the convex portion pushes up the crawler 6 corresponding to the space between the front lower fixed rolling wheel 5a and the rear lower fixed rolling wheel 5b, the position of the crawler 6 is changed to the lower movable rolling wheel. 7 prevents the crawler 6 from being twisted and the crawler 6 from coming off the lower fixed rolling wheels 5a and 5b, the lower movable rolling wheel 7, and the like.

[0006]

However, in such a conventional crawler traveling device 1, the coil spring 9
As a result, the swing arm 8 is rotated, and the crawler 6 is pressed via the lower movable rolling wheel 7 supported at the tip of the swing arm 8, so that the coil spring 9 supports the weight of the apparatus main body. However, the swing arm 8 only moves via the lower movable rolling wheel 7 in accordance with the movement of the crawler 6, and the problem that the crawler 6 cannot effectively absorb the impact of climbing over the convex portion. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and provides a crawler traveling device in which a shock when a crawler gets over an obstacle is effectively absorbed by a coil spring and a crawler. The purpose is to:

[0008]

Therefore, in order to achieve the above object, a crawler traveling device according to the present invention comprises a drive wheel (12) and an idler wheel (1) disposed before and after the apparatus main body.
1) and lower fixed wheels (14a, 14b) disposed between the drive wheel (12) and the idler wheel (11) and rotatably supported below the track frame (13).
And a crawler (16) for extending these wheel groups, the lower movable wheel (17) being movably supported below the track frame (13) in the vertical direction.
An upper movable wheel (15) supported on the upper side of the track frame (13) so as to be vertically movable, and interposed between the lower movable wheel (17) and the upper movable wheel (15). A coil spring (22) for urging the lower movable wheel (17) and the upper movable wheel (15) away from each other is provided.

[Operation] Based on the above configuration, the idler wheel (1)
1), drive wheels (12), lower fixed wheels (14a, 14)
b), the lower movable wheel (17) and the upper movable wheel (1).
The crawler (16) stretching the 5) is an obstacle (18)
When the obstacle (18) is small when passing over the vehicle, the obstacle (18) is interposed between the lower movable wheel (17) and the upper movable wheel (15) which are disposed to face up and down. By simply compressing the coil spring (22), the shock when the vehicle gets over an obstacle is absorbed. In addition, obstacles (1
When the size of the crawler (16) is large enough to compress the coil spring (22) to a close contact,
The upper part of the crawler (16) is pushed up through the coil spring (22) and the upper movable roller (15), and the crawler (16) and the coil spring (22) are pushed up. ) To absorb the shock.

The reference numerals in parentheses described above are for the purpose of comparing the drawings, and do not limit the configuration of the present invention.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. <First Embodiment> FIG. 1 is a side view showing an entire crawler traveling device according to a first embodiment of the present invention, and FIG.
FIG. 3 is an enlarged side view showing the main part of the above, FIG. 3 is a diagram for explaining the operation of the main part, and FIG.

In FIG. 1, reference numeral 10 denotes a crawler traveling device. The crawler traveling device 10 serves as, for example, a traveling portion of a combine. A plurality of lower fixed rollers 14a and 14b divided into two front and rear groups rotatably supported below the track frame 13, and an upper movable roller 15 rotatably supported above the track frame 13; Crawler 1
The crawler 16 is engaged with gears (not shown) of the idler wheel 11 and the drive wheel 12. The idler wheel 11 is mounted via a tension adjusting device (not shown).

A lower movable rolling wheel 17 is disposed below the track frame 13 at an intermediate portion between the lower fixed rolling wheel 14a on the front side and the lower fixed rolling wheel 14b on the rear side. The upper movable wheel 15 is disposed above the vehicle. The upper movable roller 15 is rotatably supported by one end of an upper movable roller boss 20 into which a frame boss 19 penetrating the Z track frame 13 is inserted.
The lower movable roller 17 is rotatably supported by one end of a lower movable roller boss 21 into which the inside of the upper movable roller boss 20 is inserted. Further, the other end of the lower movable wheel boss 21 is
It is in contact with a stopper 23 fitted in the upper movable wheel boss 20 via a coil spring 22. Thereby, the idler wheel 11, the drive wheel 12, and the lower fixed wheel 14
The crawler 16 around which the rollers 14a and 14b are wound is stretched by a lower movable roller 17 and an upper movable roller 15 which are disposed to face each other in the vertical direction.

The crawler traveling device 1 thus configured
0, the crawler 16 is normally held by the initial tension as shown in FIG. 2, and in this state, the upper movable roller 15 is pushed upward by the coil spring 22 so as not to loosen the upper portion of the crawler 16, The lower movable wheel 17 is moved by the coil spring 22 to the crawler 16.
Is grounded.

When the crawler traveling device 10 gets over the convex portion 18 which is an obstacle, the lower movable rolling wheel boss 21 pushed up through the crawler 16 and the lower movable rolling wheel 17 as shown in FIG. Compress,
The upper movable wheel boss 20 moves upward in the frame boss 19 by the spring force of the coil spring 22. As a result, the crawler traveling device 10 is
Is absorbed by the coil spring 22.

Further, when the height of the convex portion 18 is increased, the coil spring 22 is further compressed and the crawler 16 is pushed up by the upper movable rolling wheel 15 as shown in FIG. When the upper movable roller 15 is pushed up in this manner, the tension of the crawler 16 increases, and the lower side of the crawler 16 tries to push down the convex portion 18. Therefore, the upper weight of the crawler 16 and the spring force of the coil spring 22 and the crawler 16
Can get over the high convex part 18 under the tension of
Can absorb shock. <Second Embodiment> Next, a second embodiment will be described with reference to FIG.

In the above-described first embodiment, when the crawler 16 gets over the high convex portion 18 and a very large load acts on the crawler 16 such that the coil spring 22 shown in FIG. Since the crawler 16 may be broken, the load is received by the tension adjusting device that supports the idler wheel 11 via the crawler 16. That is, in the first embodiment, when a very large load is applied to the crawler 16, the bearing portion of the idler wheel 11 is configured to be damaged.

However, if an overload acts on the crawler 16 and a part of the idler wheel 11 is damaged, there is a problem that the crawler traveling device 10 cannot travel.

Therefore, in the tension adjusting device according to the present embodiment, an abnormal load (overload) acting on the crawler 16 by the spring so as not to break the idler wheel 11.
Is alleviated.

That is, the tension adjusting device 2 of the present embodiment
4, a rod 25 for supporting the rotating shaft 11a of the idler wheel 11 is inserted into and supported by the stopper 25a and the plate 26 in the idler holding cylinder 27, and between the stopper 25a and the plate 26, as shown in FIG. Spring 2
8 is interposed. In this case, the stopper 25a
Is integrally fixed to the rod 25 and is prevented from falling off by a retaining ring 27a fitted in the idler holding cylinder 27. Plate 2
Reference numeral 6 is fitted in the idler holding cylinder 27.

A pressing rod 30 penetrating the cylindrical body 29 is connected to the idler holding cylinder 27, and a nut 30a is screwed onto the pressing rod 30 to hold the pressing rod 30 and the idler holding member against the cylindrical body 29. The tension of the crawler 16 is extended by adjusting the movement of the cylinder 27.

By using a structure in which a spring is used as a buffer material in this manner, the overload acting on the idler wheel 11 can be buffered without breaking the tension adjusting device 24.

Further, since the idler holding cylinder 27 is advanced and retracted by the pressing rod 30, the size of the apparatus can be reduced and efficient work can be performed.

In FIG. 5, the same or equivalent components as those shown in FIGS. 1 to 4 are denoted by the same reference numerals, and redundant description will be omitted.

[0025]

As is apparent from the above description, according to the present invention, the crawler extending the driving wheel, the idle wheel, the lower fixed wheel, the lower movable wheel and the upper movable wheel is an obstacle. If you get over an obstacle and the size of the obstacle is small,
By simply compressing the coil springs interposed between the lower movable wheel and the upper movable wheel, which are arranged facing each other up and down, it absorbs the impact when going over obstacles and the size of obstacles Is large enough to bring the coil spring into close contact, the lower movable rolling wheel pushed up through the crawler pushes the upper side of the crawler up through the coil spring and the upper movable rolling wheel. Since the impact is absorbed by the spring, it is possible to effectively absorb the impact when the crawler traveling device passes over an obstacle.

[Brief description of the drawings]

FIG. 1 is a side view showing an entire crawler traveling device according to a first embodiment of the present invention.

FIG. 2 is an enlarged side view showing a main part of the above.

FIG. 3 is a diagram illustrating an operation of a main part of the above.

FIG. 4 is a view for explaining the operation of the main part.

FIG. 5 is a side sectional view showing a tension adjusting device of a crawler traveling device according to a second embodiment of the present invention.

FIG. 6 is a side view showing an example of a conventional crawler traveling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Idler wheel 12 Drive wheel 13 Track frame 14a Lower fixed wheel 14b Lower fixed wheel 15 Upper movable wheel 16 Crawler 17 Lower movable wheel 18 Obstacle (convex part) 22 Coil spring

Claims (1)

[Claims] 1. A drive wheel and an idler wheel respectively provided before and after the apparatus main body, and disposed between the drive wheel and the idler wheel, and rotatably supported below the track frame. In a crawler traveling device including a lower fixed rolling wheel and a crawler stretched by these rolling wheel groups, a lower movable rolling wheel supported to be vertically movable below the track frame; An upper movable wheel supported on the upper side so as to be vertically movable; a direction interposed between the lower movable wheel and the upper movable wheel to separate the lower movable wheel and the upper movable wheel from each other; And a coil spring biasing the crawler traveling device.