JPH0431195Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a tension mechanism for crawler traveling devices, which are widely used in agricultural machinery, construction machinery, etc.
Specifically, a crawler belt is wound around a drive wheel, a rolling wheel, and a tension wheel supported by a truck frame, and the tension frame, which rotatably supports the tension wheel, is moved in and out of the truck frame. The present invention relates to a tension mechanism for a crawler traveling device in which the cylinder rod can be operated to protrude by injecting grease between the cylinder rod supported and fixed to the tension frame and the cylinder tube fixed to the track frame.

[Conventional technology]

The cylinder tube used in the tension mechanism of this type of crawler traveling device is either welded to the truck frame or attached with a complicated structure.

[Problem that the invention attempts to solve]

However, if the cylinder tube becomes deformed under heavy load, the inner surface is scratched, or the seal with the rod deteriorates and grease leaks out, it becomes necessary to replace the cylinder tube. Extensive disassembly work had to be performed to remove the tube.

In addition, conventionally, for example, as disclosed in Japanese Utility Model Application Publication No. 57-74892, a cylinder tube is fixed to the side of a tension frame, and a cylinder support for slidingly guiding the cylinder tube is fitted to the truck frame. It is known that the cylinder is supported by inserting it into the cylinder, but in this case, the cylinder support is provided as a separate part, which increases the number of parts, and requires a lot of effort in disassembling and reassembling the cylinder.

The present invention was made in view of the above circumstances, and it facilitates the replacement of cylinder tubes, etc.
To provide a tension mechanism for a crawler traveling device which can be easily and inexpensively maintained and has a simple structure.

[Means for solving problems]

In order to achieve the above object, the tension mechanism for a crawler traveling device according to the present invention has the above structure, in which the cylinder tube is connected to the boss member fixed to the track frame from the tension frame side. The cylinder tube is configured so that it can be inserted along the extending direction of the cylinder rod, and the cylinder tube is provided with an abutting part that is received and fixedly supported by the boss member at a predetermined insertion position, and its functions and effects are as follows. be.

[Effect]

In other words, when fixing the cylinder tube to the truck frame side, it is enough to insert the tube into the boss part until the abutting part is received. This can be done by simply pulling the tube out to the side. Furthermore, when the cylinder tube is fixed and the crawler belt is tensioned, the reaction force received from the belt is transmitted to the cylinder tube via the tension frame, cylinder rod, and grease, and acts as a force to insert the tube deeper. Therefore, the tube is securely fixed without moving in and out of the boss member or coming off by itself.

[Effect of idea]

As a result, the cylinder tube can be easily attached and detached as a single unit, making maintenance and replacement inexpensive and easy. In addition, since the cylinder tube is simply inserted into the boss part of the truck frame to maintain its posture, it requires less assembly effort, has fewer parts, can be constructed at low cost, and is advantageous in terms of manufacturing. .

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows an example of a crawler traveling device incorporating the tension mechanism of the crawler traveling device of the present invention, in which a driving wheel 3 is disposed at the front end of a track frame 2 opposite to a tensioning wheel 1 at the rear end. A plurality of lower roller wheels 4 located between these two wheels 1 and 3 are pivotally supported by the truck frame 2, and a crawler belt 5 is wound and stretched over each wheel 1, 3, and 4. There is.

The rear end of the track frame 2 is formed as a slide bracket 6, into which a rectangular cylindrical axle support arm 7 is fitted so as to be slidable in the longitudinal direction.

A tension frame 8 is fixed to the outer end of the axle support arm 7. The tension frame 8 rotatably supports the axle 9 of the tension wheel 1, and also supports the cylinder rod 10 in parallel above the track frame 2.

As shown in FIG. 2, a cylinder support frame 11 is fixed to the upper surface of the truck frame 2, and the cylinder tube 13 is fitted into and supported by a boss portion 12 that is fixedly fixed through the cylinder support frame 11 in the front-rear direction. has been done.

A flange 14, which is an example of a prefix, is formed at the peripheral edge of the rear end opening of the cylinder tube 13, and a grease nipple 15 for injecting grease is provided at the bottom. Further, the tube 13 is inserted into the boss portion 12 from the tension frame 8 side and fixed by bringing the flange 14 into contact with the rear end of the boss portion 12.

Then, depending on the elongation of the crawler belt 5 and grease leakage, replenishment is performed via the grease nipple 15, and belt tension adjustment is performed. still,
When replacing the cylinder tube 13 or the ring seat 16 fitted onto the cylinder rod 10, remove the plug 17 provided at the bottom of the cylinder tube 13, push the cylinder rod 10 into the tube, and loosen the belt tension. Afterwards, the crawler belt 5 is removed and the axle support arm 7 is pulled out from the slide bracket 6.

[Another example]

To carry out the present invention, as shown in FIG.
The contact portion 14 may be configured as the contact portion 14.

[Brief explanation of the drawing]

The drawings show an embodiment of a tension mechanism for a crawler traveling device according to the present invention, in which FIG. 1 is a side view of the crawler traveling device, and FIG. 2 is a partially cutaway side view.
FIG. 3 is a partially cutaway side view showing another embodiment.
...Drive wheels, 4...Rollers, 5...Crawler belts,
8: tension frame; 10: cylinder rod; 11: boss member; 13: cylinder tube; 14: contact portion.

Claims (1)

[Claims for Utility Model Registration] 1. A drive wheel 3 supported by a truck frame 2;
A crawler belt 5 is wound around the track wheels 4 and the tension ring 1, and a tension frame 8, which rotatably supports the tension ring 1, is supported with respect to the track frame 2 so as to be movable in and out of the track frame 2. 8 and a cylinder tube 13 fixed to a truck frame 2, the tension mechanism of the crawler traveling device is configured such that the cylinder rod 10 can be operated to protrude by injecting grease between the cylinder rod 10 fixed to the truck frame 2, and the cylinder tube 13 fixed to the truck frame 2. 13 to the track frame 2
The cylinder rod 10 is inserted from the tension frame 8 side to the boss member 11 fixed to the cylinder rod 10.
The boss member 11 is configured to be insertable along the extending direction, and the boss member 11 is inserted at a predetermined insertion position.
A tension mechanism for a crawler traveling device in which a cylinder tube 13 is provided with an abutting portion 14 for receiving and fixing support. 2. The tension mechanism for a crawler traveling device according to claim 1, wherein the abutting portion 14 is a flange formed on the peripheral edge of the opening of the cylinder tube 13.