JPS6241911B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an idler support device for a tracked vehicle.

The idler of a tracked vehicle is attached to the track frame via a recoil mechanism so as to be movable forward and backward, and supports and guides the track, and also has the function of adjusting the tension of the track and providing a buffer.

For example, as shown in Japanese Unexamined Patent Publication No. 51-35929, it is known that a second cylindrical member equipped with a recoil mechanism is inserted into a first cylindrical member, and an idler is connected to this second member. There is.

With this structure, the sliding portion can be covered with the first member, and it is possible to prevent earth and sand from entering the sliding portion and causing wear.

However, with this structure, it is necessary to fit the second member into the first member so that it can slide freely without rotating, which makes the structure complicated, and when installing the shock absorbing spring, a special tool must be used with hydraulic pressure. It has disadvantages such as requiring a press, making disassembly and assembly work troublesome.

The present invention has been made in view of the above circumstances, and its purpose is to provide an idler support device that can prevent dirt, etc. from entering the sliding portion, has a simple structure, and is easy to disassemble and assemble. .

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

A cylindrical second truck frame member 2 is fitted into the inside of the first truck frame member 1, which is a tubular truck frame main body, through a bush 3 so as to be slidable in the longitudinal direction. An idler yoke 4 is detachably connected to the distal end flange portion 2a with bolts 5, and an idler 6 is rotatably provided on the idler yoke 4.

A cylinder tube 7 is provided at the other end of the second track frame member 2, and a piston 8 is fitted into the cylinder tube 7 to form a grease chamber 9.
A rod 10 is inserted longitudinally opposite the piston 8, and a spherical concave portion 8a of the piston 8 and a spherical convex portion 10' of the rod 10 are fitted.

The rod 10 has first and second spring receivers 11 and 12.
are fitted, a spring 13 is provided between the first and second spring receivers 11 and 12, the first spring receiver 11 abuts against the stepped portion 14 of the second track frame member 2, and the collar 10a of the rod 10 The second spring receiver 12 is in contact with the rear end surface 4a of the idler yoke 4.

A notch groove 1 in the longitudinal direction is provided in the peripheral wall on the rear end side of the second track frame member 2 so as to face each other in the diametrical direction.
5 and 15 are formed, and a pair of protrusions 17 which are inserted into the notch groove 15 are formed on the circumferential wall of the cylinder tube 7, facing each other in the diametrical direction.
A groove 19 of a holding member 18 is fitted into the protrusion 17 .

On the other hand, a pair of windows 20 are formed in the peripheral wall of the first track frame member 1, facing each other in the diametrical direction, and a flange 21 is fitted into the window 20 and fixed with bolts 22. 21
The protrusion 23 of the cylinder tube 7 is fitted into the recess 24 of the holding member 18, and the cylinder tube 7 is held by the first truck frame member 1 so as not to rotate, and the second truck frame member 2 is held by the cylinder tube 7.
It is slidable in the longitudinal direction so as not to rotate relative to the shaft.

Reference numeral 25 designates a lid fixed to the end surface of the second track frame member 2 with bolts 26 to prevent the cylinder tube 7 from coming off.

A grease nipple 27 is provided in the cylinder tube 7 and faces a window 28 of the first truck frame member 1, which is covered by a lid 29.

Since the sliding portion of the second track frame member 2 is covered by the first truck frame member 1, it is possible to prevent dirt and the like from entering the sliding portion.

Furthermore, when a large external force F acts on the idler 6, it acts on the second spring receiver 12 via the idler yoke 4, and the reaction force of the rod 10 is held by the grease in the grease chamber 9, distorting the spring 13 and causing the spring 13 to become distorted. As the frame member 2 moves to the right in the figure against the spring 13, the impact force can be alleviated.

Furthermore, when grease is injected into the grease chamber 9, the piston 8 expands and the rod 10 is extended, thereby extending the second track frame member 2 via the spring 13 and the idler yoke 4, so that the tension of the crawler track 30 can be adjusted. .

Further, the second track frame member 2 has a cutout groove 1.
5. Since rotation with respect to the first truck frame member 1 is prevented via the protrusion 17, cylinder tube 7, holding member 18, and flange 21, the idler 3 can be moved forward and backward in the correct posture.

That is, although torsional moment acts on the second truck frame member 2 due to the movement of the idler 6 (thrust force), the second truck frame member 2
The protrusion 17 of the cylinder tube 7 is inserted into the notch groove 15 of the cylinder tube 7.
is inserted into the first track frame member 1 through the holding member 18 and the flange 21.
Since the torsion moment is unrotatably connected to the cylindrical body 4, the torsional moment is reliably supported by the fitting portion between the cutout groove 15 of the cylindrical body 4 and the protrusion 17.

Further, when the second truck frame member 2 expands and contracts with respect to the first truck frame member 1, the cylinder tube 7 is in contact with the first truck frame member 1, so that the cutout groove 15 of the second truck frame member 2 and slides on the fitting portion of the protrusion 17.

Further, by removing the flange 21 and taking out the holding member 18 from the window 20, the first truck frame member 1 and the second truck frame member 2 can be made discontinuous, and the second truck frame member 2 can be made discontinuous. Since it can be easily removed, disassembly and assembly work is facilitated.

Note that the first spring receiver 11 has a keyway 1 in the rod 10.
Rotation is prevented by 1a and key 11b.

Further, the thrusting force acting on the lower part of the idler 6 is generated by the bush 3, the protrusion 17, and the notch groove 1 provided on the sliding parts of the first and second track frame members 1 and 2.
It is supported by a rotating mechanism such as No. 5.

In addition, since the idler yoke 4 is detachably provided on the second track frame member 2, when cracks or wear occur in the idler yoke 4, only the idler yoke 4 needs to be replaced, which simplifies the work. The spring 13 can be assembled and removed from the front.

In addition, the spring 13 can be assembled in advance as an assembly on the rod 10 with the first and second spring receivers 11, 12 and the nut 31, and can be easily assembled and replaced on-site without using special tools, hydraulic presses, etc. .

As described above, the present invention can prevent dirt and the like from entering the sliding portion of the idler 3, and
The second track frame member 2 can be prevented from rotating by reliably supporting the torsional moment that acts when the idler 3 moves back and forth.

In addition, the structure is simple and disassembly and assembly work is easy.

In addition, since the idler yoke 4 is detachably connected to the second truck frame member 2, and the spring 13 is attached in advance as an assembly to the rod 10 in contact with the piston 8, the spring 13 can be installed at the site. Special tools, hydraulic presses, etc. are not required during assembly, and each part can be replaced individually, making it easy to replace only the damaged part.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention.
The figure is an overall sectional view, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG. 3 is an exploded perspective view of main parts. 1 and 2 are first and second truck frame members; 4
is an idler yoke, 6 is an idler, 7 is a cylinder tube, 8 is a piston, 9 is a fluid pressure chamber, 10 is a rod, 11 and 12 are first and second spring receivers, 13 is a spring, 15 is a notched groove, 17 is a 18 is a holding member, 20 is a window, and 21 is a cap.

Claims (1)

[Claims] 1. A second truck frame member 2 to which an idler yoke 4 having an idler 6 is removably connected is slidably inserted into a hollow first truck frame member 1, and a cylinder is inserted into the second truck frame member 2. A tube 7 is provided, a piston 8 is fitted into the cylinder tube 7 to form a fluid pressure chamber 9, a rod 10 is brought into contact with the piston 8, and first and second spring receivers 11, 12 are attached to the rod 10. A spring 13 is provided through the cylinder tube, the first spring receiver 11 is brought into contact with the idler yoke 4, the second spring support 12 is brought into contact with the intermediate part of the rod 10, and the protrusion 17 provided on the cylinder tube 7 is connected with the second track frame. A window 20 is formed in the first track frame 1, and the flange 2 is inserted into the notch groove 15 of the first track frame 1 so as to be slidable in the longitudinal direction and not to move in the circumferential direction.
1 is detachably provided, and a holding member 18 fitted to the projection 17 is detachably connected to the flange 21.