JPH0635880Y2 - Crawler traveling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a crawler traveling device equipped in a mobile agricultural machine such as a combine harvester or a harvester, and more specifically, to a swinging motion of a balance pivotally supported on a track frame. The present invention relates to a crawler traveling device in which movable crawler wheels are supported at both front and rear ends of a moving member to guide a crawler belt to the ground.

[Conventional technology]

As the conventional crawler traveling device, as shown in, for example, Japanese Utility Model Laid-Open No. 62-16571 and Japanese Utility Model Laid-Open No. 60-110086, there are two or three rocking members for a plurality of balance rocking members. The movable grounding wheels are pivotally supported, and the grounding area of the crawler belt is formed by these movable grounding wheel groups.
It is known that the rocking fulcrum of each rocking member is biased in the longitudinal direction of the rocking member so that each rocking member rocks by its own weight.

[Problems to be solved by the device]

In the conventional structure described above, the movable grounding wheels supported on the front and rear sides of the swing fulcrum vertically swing in a contradictory manner with the balance swing of the swing member. Therefore, when traveling on a horizontal road surface, for example. , Both movable grounding wheels receive an upward force to maintain balance in a fixed position, which enables stable running, and
When traveling on uneven parts, when one movable grounding wheel on one side rides on the convex part, the other movable grounding wheel moves down and acts deeply on the crawler belt. It has an advantage that it can smoothly pass through the section.

Further, in the above-described conventional structure, since each swing member swings by its own weight, when traveling across a ridge, for example, the vicinity of the front and rear ends of the traveling device grounding portion rides on the respective convex portions, and the crawler is formed in the concave portion therebetween. Even when the belt bends downward, the swinging member swings by its own weight, so that the movable grounding wheel that has moved downward can follow the bent crawler belt and avoid wheel removal. Have

However, in the above-mentioned conventional structure, since the entire grounding area of the crawler belt is formed by the group of movable grounding wheels, the length of the grounding area is increased by vertically displacing the movable grounding wheels at the foremost end and the rearmost end. When traveling on a weak running surface, the movable grounding wheels at the foremost end and the rearmost end both retract upward, shortening the length of the grounding area and causing the traveling device to sink. There was a problem that it brought about a state where it was easy to do.

The present invention has been made with this point in mind, and while utilizing the above-mentioned advantages of the conventional structure that introduces a movable grounding wheel that moves upside down and upside down, the traveling device does not sink even on a weak traveling surface. It is an object to provide a crawler traveling device that can travel.

[Means for Solving the Problems]

A feature of the present invention is that a fixed grounding wheel is pivotally supported in front of and behind the track frame, and movable grounding wheels are provided at both front and rear ends of a swinging member which is pivotally supported at an intermediate portion in the longitudinal direction of the track frame to swing. The fixed grounding roller and the movable grounding roller so that the fixed grounding wheels are located at the front and rear ends of the grounding area of the crawler belt, respectively. The rotation moment due to the own weight of the swing arm portion located on the central portion side in the front-rear direction of the crawler belt contact area is set to be larger than the rotation moment due to the own weight of the swing arm portion on the opposite side, and swings downward. The movable grounding wheel provided on the swing arm portion is displaced downward with respect to a tangent line to the lower peripheral edge of the fixed grounding roller, and swings upward, so that the movable grounding wheel provided on the opposite swing arm portion is movable. The grounding roller lies in that the rocking member is pivotally supported on the track frame so as to be displaced upward with respect to the tangent line, and its action and effect are as follows.

[Action]

For example, when traveling on a horizontal road surface, both movable grounding wheels receive upward force to maintain balance in a fixed position,
If you can run stably and run on uneven parts,
When the movable grounding wheel on one side rides on the convex portion, the other movable grounding wheel on the other side descends downward and acts deeply on the crawler belt, so that it is possible to smoothly pass through the uneven portion while improving the wheel removal prevention function. .

Also, when traveling across ridges, etc., even if the front and rear ends of the traveling device grounding portion ride on the respective convex portions and the crawler belt bends downward in the concave portions, the oscillating member oscillates under its own weight. By doing so, the movable ground contact wheel that has moved downward can follow the bent crawler belt, and avoid wheel removal.

In addition, fixed grounding wheels are located at the front and rear ends of the grounding area of the crawler belt, and the grounding area is always kept long regardless of the vertical movement of the movable grounding roller, so that the traveling device sinks even on a weak running surface. Is suppressed.

[Effect of device]

Therefore, according to the present invention, it is possible to effectively operate the movable grounding wheel that moves up and down in an anti-reverse manner, and to perform smooth running satisfactorily by exhibiting a high derailing prevention function for running on level ground, running on uneven terrain, and climbing ups and downs. However, it has become possible to maintain a constant long ground contact area even on a weak running surface and to reliably run with less sinking.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a crawler traveling device (1) for a combine according to the present invention. This crawler traveling device (1) has six wheels arranged in parallel in the front-rear direction between the driving wheel body (2) at the front end, the tension wheel body (3) at the rear end, and the respective wheel bodies (2), (3). Grounding wheels (4a), (4b), (4c), (4d), (4e),
(4f) A crawler belt (5) is wound around the respective members and stretched. Then, power is supplied to the drive wheel body (2) from the combine body (not shown) side, and the wheel body (2) engages with the crawler belt (5) to drive the crawler belt (5). .

The six grounding wheels (4a), (4b), (4c), (4d),
(4e) and (4f) are fixed grounding rollers that engage between the cored bar protrusions (6) of the crawler belt (5) to guide them to the ground, and pivot the two front and rear ends to the track frame (8). Ring (4
a), (4f), and the four ground-side movable ground wheels (4b), (4c), (4)
d) and (4e), and the front and rear two of them are respectively supported by single rocking members (7) and (7). In detail,
Each rocking member (7), (7) is bent in a dogleg shape,
The bent portion is pivotally supported on the track frame (8), and the front and rear swing arm portions (9a), (9b), (9c) and (9d) are configured to swing in a reciprocal balance, and The movable grounding wheels (4b), (4c), (4d), (4e) are supported at both ends.

Then, the swing arm portions (9b), (9c) on the central side in the front-back direction of the crawler belt (5) grounding area of the swing members (7), (7) are replaced with the swing arm portions on the opposite side. (9
It is set longer than a) and (9d), and the rotation moment due to its own weight on the center side is set larger than the rotation moment due to its own weight on the opposite side. In addition, the movable grounding wheel (4) provided on the swinging arm portions (9b) and (9c) swinging downward.
c) and (4d) are displaced downward with respect to the tangent to the lower peripheral edge of the fixed grounding wheels (4a) and (4f) and swing upward, on the opposite side swing arm portion (9a), The swing members (7) and (7) are mounted on the track frame (8) so that the movable grounding wheels (4b) and (4e) provided on (9d) are displaced upward with respect to the tangent line. It is pivotally supported.

With such a configuration, when passing through a recess having a long span as shown in FIG. 2, the movable grounding wheel (4c) on the side of the central portion of the belt where the crawler belt (5) droops greatly in accordance with the drooping, (4d) oscillates downward along the crawler belt (5) by its own weight, and engages with the core metal projection (6) of the crawler belt (5) to prevent wheel removal.

[Another embodiment]

Also, the swing arm portions (9b) and (9c) on the central portion side may be made thicker than the swing arm portions (9a) and (9d) on the opposite side to increase the rotation moment. Good.

Further, as shown in FIG.
A method of urging the swing arm on the center side downward with a spring is conceivable.However, not only the structure is complicated, but mud is likely to adhere to the spring to cause malfunction, and the swing of the swing arm is reduced by its own weight. The structure is simpler and the movement is not hindered by the adhesion of mud, etc., and is practically effective.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

1 and 2 show an embodiment of a crawler traveling device according to the present invention. FIG. 1 is a side view and FIG. 2 is a side view showing a state of traveling in a recess having a long span. And FIG. 3 is a side view showing a comparative example. (4b), (4c), (4d), (4e) ... Movable grounding roller,
(5) ... Crawler belt, (7), (7) ... Swing member, (8) ... Track frame, (9a), (9b),
(9c), (9d) ... Swing arm part.

Claims (1)

[Scope of utility model registration request] 1. A fixed grounding wheel (4a), (4f) is pivotally supported in front of and behind the track frame (8), and is pivotally supported by an intermediate portion in the longitudinal direction of the track frame (8) and swings by a balance. The movable grounding wheels (4b), (4c), (4d) and (4e) are respectively supported on the front and rear ends of the rocking members (7) and (7), and the front and rear ends of the grounding area of the crawler belt (5) are supported. So that the fixed grounding wheels (4a), (4f) are located in the
a), (4f) and the movable grounding wheels (4b), (4c),
(4d) and (4e) are configured to guide the crawler belt (5) to the ground, and the crawler belt (5) in the rocking members (7) and (7) is positioned on the central portion side in the front-back direction in the grounding region. The rotation moment due to the own weight of the swinging arm portions (9b) and (9c) is set to be larger than the rotation moment due to the own weight of the swinging arm portions (9a) and (9d) on the opposite side, and the swinging portion is swung downward. The movable grounding wheels (4c) and (4d) provided on the swing arm portions (9b) and (9c) are the fixed grounding wheels (4a) and (4f).
The movable grounding wheels (4b) and (4e) provided on the opposite swing arm portions (9a) and (9d) that are displaced downward with respect to the tangent to the lower peripheral edge of the A crawler traveling device in which the swing members (7), (7) are pivotally supported on a track frame (8) so as to be displaced upward with respect to the tangent line.