JPH0885480A - Crawler structure - Google Patents

Abstract

PURPOSE: To provide a crawler structure effectively applicable to a tractor traveled by a crawler by surely guiding the crawler with rollers, and preventing the rollers from being released from the crawler. CONSTITUTION: A crawler 30 is suspended between a front idler and a rear idler, and rollers are coupled with guide projections 30a, 30b provided on the inner face of the crawler 30 on the inside of the ground side of the crawler 30 at the middle position between the front idler and rear idler. This crawler structure is provided with the rollers arranged directly behind the front idler and directly before the rear idler, i.e., outer rollers 13a rolled on the outsides of the guide projections 30a, 30b, and an intermediate roller 13b rolled at the inside between the guide projections 30a, 30b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler structure, and more particularly to a crawler structure capable of suitably preventing derailment.

[0002]

2. Description of the Related Art In a tractor, a construction machine or the like, a traveling portion having a crawler structure is used for traveling on rough terrain. FIG. 1 shows a semi-crawler type tractor. In such a crawler structure, the rolling wheels 12a to 12a are provided between the front idler 10 and the rear idler 20.
12d is arranged to guide the crawler 30 not to come off from the front idler 10 and the rear idler 20 during traveling.

FIG. 4 shows a conventional crawler structure in which a crawler 30 is guided by a rolling wheel. Figure 4 (a) shows the most commonly used guide method.
As the rolling wheels 5 that engage with the guide protrusions 30a and 30b provided on the outer side of the guide protrusions 30a and 30b,
b is provided, and the outer surfaces of the guide protrusions 30a and 30b are used as guide surfaces to prevent the crawler 30 from being displaced.

On the other hand, the example shown in FIG.
With the rolling wheel 6 arranged inside the a and 30b,
The inner surfaces of the guide protrusions 30a and 30b and the outer surface of the rolling wheel 6 are used as guide surfaces to prevent the crawler 30 from being displaced. As described above, when the rolling wheel 6 is passed between the guide protrusions 30a and 30b, the crawler 30 is provided with the through hole 30c, so that when the rolling wheel 6 passes through the through hole 30c, the mud or soil is passed through the through hole 30c. Can be pushed out from the guide protrusion 3
It is possible to ensure the engagement of the rolling wheels 6 with the wheels 0a and 30b.

[0005]

By the way, the rolling wheel is for guiding the crawler so as not to come off the front idler or the rear idler. However, in the case where the vehicle having the crawler changes the direction on the spot. , Stop the rotation of the right or left crawler and rotate the other. In such a turning operation, a large shift force acts on the crawler, so that the rolling wheel may float from the guide protrusion and may be derailed.

In particular, when the crawler is made of rubber, the rolling wheels and the guide projections are easily disengaged due to the displacement force when the vehicle is turned, and the idler is easily disengaged from the crawler. The present invention
Thus, it is an object of the present invention to provide a crawler structure in which the guide of the crawler by the rolling wheels is suitably performed in the vehicle having the crawler, and it is possible to suitably prevent the wheel from derailing when the vehicle rolls.

[0007]

The present invention has the following constitution in order to achieve the above object. That is, the crawler is laid between the front idler and the rear idler, and the guide protrusions provided on the inner surface of the crawler are rolled inside the crawler at the intermediate position between the front idler and the rear idler. In the crawler structure provided with a rolling wheel, the rolling wheels arranged immediately after the front idler and immediately before the rear idler among the rolling wheels are provided on the outer rolling wheel and the guide projection rolling outside the guide projection. It is characterized in that it is configured to have a centering wheel that rolls on the inside sandwiched. The crawler structure is suitable for application to a crawler which is a rubber crawler.

[0008]

In the crawler structure according to the present invention, among the wheels to be installed between the front idler and the rear idler, the wheels immediately after the front idler and immediately before the rear idler are the outer wheels and the middle wheels. By adopting a configuration having wheels, it is possible to effectively prevent the rolling wheels from coming off from the guide protrusions, as compared with a conventional rolling wheel having only outer wheels, and to ensure the guide action of the crawler by the rolling wheels. It is possible to prevent the crawler from being disengaged from the front idler or the rear idler when the vehicle turns, and to provide a vehicle that is easy to handle.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. 1 and 2 are explanatory views of a semi-crawler type tractor to which a crawler structure according to the present invention is applied, as viewed from a side direction and a front direction. The illustrated tractor has a crawler structure only in the rear running part. In the crawler structure part, a sprocket 40 which is a driving wheel is located at an intermediate position between the front idler 10 and the rear idler 20 and slightly more than the front idler 10 and the rear idler 20. It is placed in a high position. The reason why the sprocket 40 is arranged at a relatively high position in this way is to set the height of the vehicle body high, but the position of the sprocket 40 is not particularly limited by the present invention.

In FIG. 1, reference numerals 12a, 12b, 12c and 12d denote rolling wheels arranged on the ground contact surface side of the crawler 30 and between the front idler 10 and the rear idler 20. In the embodiment, the pair of rolling wheels 12a and 12b and the pair of rolling wheels 12c and 12d are pivotally supported on the support plate 14 so as to be rotatable. The support plate 14 is rotatably supported on the bottom of the main body of the vehicle and is freely rotatable in the vertical plane. As shown in FIG. 2, the crawler 3
Guide protrusions 30a and 30b are erected on the inner surface of 0, and rolling wheels 12a, 12b, 12c, and 12d are arranged so as to engage with the guide protrusions 30a and 30b and roll.

The crawler structure of the present embodiment has these rollers 12.
Regarding the structure of a, 12b, 12c, 12d, the rolling wheel 12a arranged immediately after the front idler 10 and the rolling wheel 12d arranged immediately before the rear idler 20 roll outside the guide protrusions 30a, 30b. The outer rolling wheel and the inner rolling wheel that rolls inside sandwiched between the guide projections 30a and 30b are both provided. For the rolling wheels 12b and 12c, only the outer rolling wheel that rolls outside the guide projections 30a and 30b is used. It is characterized by having a configuration having. The structure of the rollers 12b and 12c having only these outer wheels is shown in FIG. 4 (a).
The structure is the same as that of the conventional wheel shown in FIG.

FIG. 3 is an enlarged view of the structure of the rolling wheels 12a and 12d. As shown, the rollers 12a, 12d are outer wheels 13a, 1d that roll outside the guide protrusions 30a, 30b.
3a and the inner race wheel 13b that is rolled between the guide projections 30a and 30b and rolls inside. Rolling wheel 1 like this
2a and the roller 12d have both the outer wheel 13a and the inner roller 13b, and both the outer wheel 13a and the inner wheel 13b are engaged with the guide protrusions 30a and 30b, so that the guide protrusion 30
By guiding the crawler 30 with both the outer and inner surfaces of the a and 30b serving as guide surfaces, it is possible to preferably prevent the rolling wheels 12a and 12d from derailing from the crawler 30.

FIG. 3 shows a state in which the roller 12a is considerably inclined with respect to the crawler 30 and one side thereof is floated from the inner surface of the crawler 30. By providing 13a and the inner wheel 13b, it is possible to prevent the guide projections 30a, 30b and the wheel 12a from coming off. In the example, as compared with the case where only the outer wheel is used, it is possible to increase the wheel removal limit height by about 20 mm by providing the inner wheel. A through hole 30c was provided between the guide protrusions 30a and 30b for discharging mud, soil and the like.

In the crawler structure of the embodiment, the rolling wheels 12 immediately after the front idler 10 and immediately before the rear idler 20.
Although only a and 12d have outer and inner wheels,
This is because it is most effective to guide the crawler 30 at a position close to the front idler 10 and the rear idler 20 so that the crawler 30 does not move out of the normal position. Of course, the rolling wheels 12b and 12c may also have a structure including outer and inner rolling wheels.

As in the present embodiment, among the wheels arranged between the front idler 10 and the rear idler 20, the wheels closest to each idler are constituted to have outer wheels and middle wheels. Since it is possible to effectively prevent the rolling wheels from coming off from the guide protrusions 30a and 30b, it is preferable to prevent the rolling wheels from coming off the crawler even when the crawler is made of rubber and the rolling wheels easily come off from the guide protrusions. It becomes possible to do. The crawler structure according to the present invention is not limited to a rubber crawler, and is effectively applicable to a metal crawler as well, and the embodiment is an example applied to a semi-crawler type tractor. It goes without saying that the same can be applied to general construction equipment and the like.

[0016]

As described above, according to the crawler structure of the present invention, it is possible to effectively prevent the rolling wheels from coming off the crawler, and to remove the wheel from a tractor or the like using a rubber crawler. It has a remarkable effect that it can be suitably applied as a prevented vehicle.

[Brief description of drawings]

FIG. 1 is a side view of a semi-crawler type tractor to which a crawler structure according to the present invention is applied.

FIG. 2 is a front view of a semi-crawler type tractor to which the crawler structure according to the present invention is applied.

FIG. 3 is a cross-sectional view showing how the crawler structure according to the present invention engages the rolling wheels and the guide protrusions.

FIG. 4 is an explanatory view showing a conventional crawler structure.

[Explanation of symbols]

 5,6 Roller wheel 10 Front idler 12a, 12b, 12c, 12d Roller wheel 13a Outer wheel 13b Middle wheel 14 Support plate 20 Rear idler 30 Crawler 30a, 30b Guide protrusion 30c Through hole

Claims (2)

[Claims] 1. A crawler is stretched between a front idler and a rear idler, and is engaged with a guide protrusion provided on an inner surface of the crawler at an intermediate position between the front idler and the rear idler on the inner side of the ground of the crawler. In a crawler structure provided with a rolling wheel that rolls around, a rolling wheel that is arranged immediately after the front idler and immediately before the rear idler among the rolling wheels and an outer rolling wheel that rolls outside the guide protrusion is A crawler structure characterized in that it has a structure in which it has inner rollers which are sandwiched between guide protrusions and roll inside. 2. The crawler structure according to claim 1, wherein the crawler is a rubber crawler.