JPH028871Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is a track frame that allows only the front and rear intermediate parts of the group of wheels that guide the ground-contacting side of the traveling crawler back and forth to be vertically swingable. The present invention relates to a crawler traveling device in which the swinging arm is supported by the free end of a swinging arm attached to the swinging arm, and the swinging arm is swingingly biased downward.

[Prior art]

Generally, the biasing structure for the swinging arm is often constructed by disposing a compression coil spring on the swinging arm so that the swinging arm faces downward.

[Problem that the invention attempts to solve]

However, when the biasing structure is configured with compression coil springs, the crawler traveling device itself is installed at the bottom of the traveling body, so mud often gets into the coil springs, and the action of lifting the swing arm upward is difficult. In such cases, the compression of the coil spring is hindered by the muddy soil, so that the swinging arm cannot swing, resulting in a problem in which the aircraft body swings significantly when climbing over a protrusion on the ground or the like.

In order to solve this problem, the system shown in FIG. 5 was devised. That is, the rolling wheels 5a that come into contact with the crawler belt 7 are rotatably supported by the swing arm 9, and the swing arm 9 is arranged on the track frame 3 so as to be swingable around the support shaft 13 in the left-right direction of the machine. . At the other end of this swing arm 9 is a rod 20,
A biasing mechanism A consisting of a plate 21, a coil spring 23 sealed with a rubber material 22, and a bracket 24 attached to the truck frame 3 is disposed on the upper surface of the truck frame 3 and biases the rolling wheels 5a in the direction of the crawler belt 7. It is configured like this.

This configuration is configured to prevent mud from entering the coil spring 23 by sealing the rubber material 22, but after long-term use, the rubber material 23 deteriorates and cracks occur on the surface, and mud flows through the cracks. Not only does it not penetrate and produce a sealing effect, but the coil spring 23
There is a problem in that it takes time and effort to seal the structure with the rubber material 22, and since the biasing mechanism A is provided on the top surface of the truck frame 3, a space is required for arranging the biasing mechanism A on the top surface of the truck frame 3. It was something to do.

The present invention was developed in view of the above-mentioned circumstances, and is constructed so that the swing arm can swing smoothly without interfering with the operation of the biasing structure even if mud invades the biasing structure. The purpose is to provide a crawler traveling device with a simple structure.

[Means to solve the problem]

A feature of the present invention is that a cantilevered spring member is provided between the support shaft to which the swing arm is fixed and the truck frame, and which applies a rotational biasing force to the support shaft. The action and effect are as follows.

[Effect]

In other words, as mentioned above, since the biasing structure is composed of a cantilevered spring, if mud intrudes into the spring part, the action of lifting the swinging arm upwards Since the spring generates a biasing force by bending, the swinging arm swings without being hindered by the mud. Further, since the biasing force is generated by the deflection of the spring, no seal structure is required.

In addition, as mentioned above, since the spring is disposed in a cantilevered manner on the swing arm via the support shaft, the biasing structure can be improved by making the arrangement direction of the spring along the track frame. Can be installed without being located on the top surface of the truck frame.

[Effect of idea]

Therefore, the swing arm can always swing properly without being affected by mud, and it is possible to climb over protrusions on the ground without significantly swinging the aircraft. Since the structure is not located on the top surface of the truck frame, a crawler traveling device can be provided with a simple structure in which rollers and the like for supporting the climbing and descending of the crawler belt can be disposed on the top surface of the truck frame.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, a truck frame 3 is attached to a body frame 1 constituting a traveling body through vertical frames 2. This truck frame 3 consists of a fixed frame 3a and a movable frame 3b.
A drive sprocket 4, a large number of rolling wheels 5, and tension wheels 6 are supported on each of the frames 3a and 3b, and a crawler belt 7 is wound around these, thereby forming a crawler traveling device. There is.

The movable frame 3b is biased by a coil spring 8 interposed between the movable frame 3b and the fixed frame 3a so as to tension the crawler belt 7, and as shown in the same figure, the two central parts are provided with swing arms 9. It is supported at the end and is biased in the direction of the crawler belt 7 by a biasing mechanism A so that it can run over protrusions on the ground without significantly shaking the traveling body.

To be more specific, as shown in FIGS. 2 and 3,
The biasing mechanism A consists of an arm member 10 and a leaf spring 11.
is fixedly installed on a support shaft 13 that is disposed through the support shaft 2,
The leaf spring 11 is disposed in a cantilevered manner on the track frame 3 via a bracket 14 so as to press against the arm member 10 from above, and is configured to allow the swing arm 9 to swing upward.

The crawler belt 7 is constructed by embedding a core bar 15 having a pair of protrusions 15a at regular intervals in a rubber belt 7a, and further includes through holes 7b into which the protrusions 4a of the driving sprocket 4 are inserted. The rolling wheels 5a, 5a, which are continuously bored and supported by the arm 9, are arranged so as to fit between the protrusions 15a, 15a so that they will not easily come off the crawler belt 7 even when rocking, and , other wheels 5
b... are arranged so as to straddle the outside of the protrusions 15a, 15a so as to strongly support the weight of the machine.

[Another example]

In this embodiment, a cam member 10 is attached to the support shaft 13 and a leaf spring 11 is attached to the track frame 3 to urge the rolling wheels 5a.
However, instead of this, as shown in FIG. Therefore, the locking protrusion 16 that generates a biasing force on the swinging arm 9 may be fixedly provided. In other words, the leaf spring 11 installed in the swing system
It is also possible to arrange it in a fixed system.

Furthermore, although the leaf spring 11 is used in the biasing mechanism A in this embodiment, a rod-shaped spring or the like may be used in place of this, and these will be referred to as spring members B.

[Brief explanation of the drawing]

The drawings show an embodiment of the crawler traveling device according to the present invention, in which Fig. 1 is an overall side view, Fig. 2 is a longitudinal cross-sectional rear view showing the mounting structure of biased wheels, and Fig. 3 is a biased roller traveling device. Figure 4 is a back view showing another embodiment of the biasing structure for the biased rollers, and Figure 5 is a comparison of the biasing structures for the biased rollers. It is a back view which shows an example. 3...Truck frame, 5a...Rolling wheels, 7...
... Traveling crawler, 9... Swinging arm, 10... Arm, 13... Support shaft, B... Spring material.

Claims (1)

[Scope of Claim for Utility Model Registration] Of a group of wheels that guide the ground-contacting side portion of the traveling crawler 7 back and forth, only the front and rear intermediate portion 5a is attached to the truck frame 3 so as to be vertically swingable. It is a crawler traveling device in which the swing arm 9 is supported at the free end of the track frame 3, and the swing arm 9 is swing-biased downward.
A crawler traveling device in which a cantilevered spring member B is provided between the support shaft 13 and the support shaft 13 to apply a rotational biasing force. The crawler traveling device according to claim 1, wherein the base end of the spring member B is fixed to the track frame 3, and the free end thereof is brought into contact with an arm 10 fixed to a support shaft 13.