JPS604850Y2 - Track adjustment and shock absorbing device for tracked vehicles - Google Patents

Description

[Detailed Description of the Invention] This invention relates to track adjustment of tracked vehicles and improvement of shock absorbers.

The conventional belt adjustment and shock absorbing device for a tracked vehicle is explained with reference to Figure 1.2.A is the car body, b is the chassis attached to the car body a, C is the sprocket attached to one end of the chassis b, and f is a crawler track adjustment and shock absorbing device attached to the other end of the chassis b, and as shown in detail in Figure 2, the ram cylinder f1 fixed to the chassis b and the grease inlet provided in the ram cylinder f f2 and the same ram cylinder f
A ram f3 slidably inserted into the ram f3, a spring receiver f4 and an adjustment rod f5 fixed to the ram f3, and a spring receiver f
, a protection tube f6 having one end welded to the adjustment rod f
The spring receiver f7 is slidably inserted into the spring receiver f7.
7 and the spring receiver f4, a nut f9 screwed to the other end of the adjustment rod f5, and a fork bearing f1 fixed to the spring receiver f7. There is.

In addition, d in Figures 1 and 2 is an idler attached to the fork shaft %O, e is a crawler track suspended between the idler d and the sprocket C, and g is a guide roller that supports the load applied to the crawler track e. When grease is injected into the ram cylinder f□ from the grease inlet f2, each component 4 to f10 of the crawler adjustment and shock absorbing device f and the idler d are pushed to the left, causing the crawler e to have the initial tension Fo shown in Fig. 3. If a stone or the like gets caught between the idler d and the track e, the idler d, fork bearing flo, and spring receiver f7 will try to move to the right, causing the compression spring f8 to move in the compression direction. A load is added, but the same load is the initial load F in Figure 3.
In the range of s, the compression spring f8 hardly undergoes elastic deformation, and the idler d, fork bearing flo, and spring receiver f
7 is held at the initial position, and if the above load exceeds the initial load Fs, the compression spring f8 is applied with the maximum load Fm.
The idler d and the fork bearing f
When lo and spring receiver f7 are moved back so that the shock is absorbed, and stones etc. are removed from between idler d and crawler track e, idler d and fork shaft □□.

and spring receiver f7 are returned by compression spring f8, so that initial tension Fo is applied to crawler belt e.

In the track adjustment and shock absorbing device for tracked vehicles, even if a stone or the like gets caught between the idler d and the track e, the load applied to the device does not exceed the initial load Fs.
do not retreat.

If you cross it, you will be forced to retreat.

The compression spring f8 performs the function of returning the stone to its original position if it is removed, so if the tracked vehicle becomes larger, a larger compression spring f8 will have to be used, and the inside of the chassis will be damaged. There was a problem that it could no longer be accommodated.

This proposal addresses the above-mentioned problems.The large-diameter ram provided on one side of the ram flange is used as a large-diameter cylinder for buffering, and the small-diameter ram provided on the other side of the ram flange is used as a small-diameter cylinder for initial tension adjustment. The ram collar, the large diameter ram, and the large diameter cylinder are each slidably inserted into the chassis, and the plurality of flexible hollow spheres are housed between a pair of brackets provided in the chassis. It is housed in a pressure accumulation chamber provided in the large diameter ram so as to communicate with the oil chamber of the large diameter cylinder, and is placed in the middle of the oil supply pipe connecting the oil pump and the operating valve, and between the pressure reducing valve, the check valve, and the large diameter cylinder. A crawler track for a tracked vehicle, characterized in that the track is connected to an oil chamber by an oil supply pipe, and a grease filling chamber is formed on the inner peripheral surface of the cylinder between the O-ring of the large diameter cylinder and the oil chamber. The purpose of this invention relates to adjustment and shock absorbing devices and can also be applied to large tracked vehicles.

The present invention also provides an improved crawler track adjustment and shock absorbing device that can store a portion of the pressure oil from the oil pump toward the operation valve in a pressure storage chamber at a constant pressure without affecting the pressure reducing valve or oil pump system. At the point.

Next, the track adjustment and shock absorbing device of the tracked vehicle of the present proposal were carried out in the fourth step.
To explain with an embodiment shown in FIG. 5, 1 in FIG. 4 is a chassis attached to the body of a tracked vehicle (not shown), 2 is a ram flange, and 3 is a chassis attached to one side of the ram flange 2. large diameter ram,
4 is a small-diameter ram provided on the remaining side of the ram flange 2; 5 is a large-diameter shock-absorbing cylinder that is slidably inserted into the large-diameter ram 3; and 6 is a large-diameter cylinder that is slidably inserted into the small-diameter ram 4. A ram collar 2, a large diameter ram 3, and a large diameter cylinder 5 are housed between a collar support bracket 7 and a cylinder support bracket 8 provided in the chassis 1.

Further, reference numeral 9 indicates an oil supply port provided in the head portion of the large diameter cylinder 5, 5a indicates an oil chamber within the large diameter cylinder 5, and 11 indicates an O-ring for preventing oil leakage attached to the inner surface of the other end of the large diameter cylinder 5. ,
5b is an annular grease filling chamber provided on the inner circumferential surface of the large-diameter cylinder 5 between the O-ring 11 and the oil chamber 5a, 10 is a grease injection port penetrating the wall of the large-diameter cylinder 5, and 12 is the A grease supply hole passing through the ram flange 2 and the small-diameter ram 4; 13 a grease inlet provided in the ram flange 2; and 14 an oil leakage prevention hole 01J attached to the inner peripheral surface of one end of the small-diameter cylinder 6. 15 is a fork bearing attached to the other end of the small diameter cylinder 6, and 16 is the fork bearing 1.
5 is an idler attached to the large diameter ram 3; 17 is a pressure accumulation chamber provided in the large diameter ram 3; 18 is a plurality of flexible hollow spheres (e.g. rubber hollow spheres) housed in the pressure accumulation chamber 17; 19 is a pressure accumulation chamber provided in the large diameter ram 3; A lid 20 screwed onto one end of the diameter ram 3 is the oil chamber 5a.
21 in FIG. 5 is an oil pump installed on the tracked vehicle, 24 is an operation valve, and 22 is an oil supply hole that is operated from the oil pump 21. Oil supply pipe extending to valve 24, 23 is the same operated valve 2
4, an oil drain pipe extending from the tank to the tank; 27, a driving cylinder for a working device installed on the tracked vehicle; 25 and 26, a fuel supply pipe extending from the operation valve 24 to the driving cylinder 27;
28, 29, and 30 are oil supply pipes extending from the middle of the oil supply pipe 22 to the oil chambers 5a of the left and right large diameter cylinders 5, 31 is a pressure reducing valve provided in the oil supply pipe 28, and 32, 33 is the oil supply pipe 29.
．． This is a check valve provided at 30.

Next, the operation of the crawler track adjustment and shock absorbing device will be explained.

Grease is supplied from the grease inlet 10 to the grease filling chamber 5b.
Fill the filling chamber 5b until it is full, then start the oil pump 21, operate the operating valve 24, and supply pressure oil to the piston side oil chamber or piston rod side oil chamber of the working equipment drive cylinder 27. Then, the piston-side oil chamber is operated to the stroke end to increase the pressure inside the oil supply pipe 22.

At this time, the pressure oil in the oil supply pipe 22 is depressurized by the pressure reducing valve 31, and then passes through the oil supply pipes 28, 29, and 30 until the oil chambers 5a and pressure storage chambers 17 of the left and right large-diameter cylinders 5 are filled. The large diameter cylinder 5 is brought into contact with the cylinder support bracket 8 and the ram collar 2 is brought into contact with the collar support bracket 7, respectively, and then the pressure is reduced to increase the pressure on the oil supply pipes 2B and 29.30 side. Adjust the set pressure of the valve 31,
Each flexible hollow sphere 18 is compressed to reduce its volume, but when a pressure corresponding to the initial load Fs is stored in the pressure accumulating chamber 17, the operating valve 24 is returned to the neutral position.

Next, grease is injected from the grease inlet 13 through the grease supply hole 12 into the grease filling chamber 6a of the small diameter cylinder 6, pushing the small diameter cylinder 6, fork bearing 15, and idler 16 to the left to apply an initial tension Fo to the crawler track. give.

When the tracked vehicle reaches the above conditions, it will start running, but
If a stone or the like gets caught between the idler 16 and the crawler track, it will pass through the idler 16, fork bearing 15, small diameter cylinder 6, small diameter ram 4, ram collar 2, and large diameter ram 3 to the oil chamber 5a.
A load is applied to the

However, if this load is within the range of the initial load Fs, the pressure stored in the pressure accumulator 17 will oppose and the above-mentioned parts will not retreat, and if it exceeds the range of the initial load Fs, the above-mentioned parts will not move back. The oil chamber 5a, the refueling pressure chamber 17, and the inside of the oil supply pipe 29 (or 30) up to the check valve 32 (or 33) are pressurized and each flexible hollow sphere 18 is further compressed.

Furthermore, when a stone or the like is removed from between the idler 16 and the crawler track, the pressure stored in the pressure accumulation chamber 17 acts on the oil chamber 5a, and the large diameter ram 3, the ram collar 2, the small diameter ram 4, and the small diameter cylinder 6, the fork bearing 15, and the idler 16 move forward until they come into contact with the collar support bracket 7, thereby applying an initial tension Fo to the crawler track.

In this manner, in the belly belt adjustment and shock absorbing device of the present invention, even if a stone or the like is caught between the idler 16 and the crawler track, if the load applied to the device does not exceed the initial load Fs, the idler 1
Don't let 6 go backwards.

If you cross it, you will be forced to retreat.

The function of returning to the original position when stones, etc. are removed is achieved by the ram flange 2, the large diameter ram 3 provided on one side of the ram flange, the large diameter cylinder 5 slidably fitted into the ram flange 2, the flange support bracket, and the cylinder. A refueling system comprising a support bracket 8, a pressure accumulation chamber 17 provided in the large-diameter ram 3, a plurality of flexible hollow spheres 18 housed in the pressure accumulation chamber 17, a pressure reduction valve 31, and check valves 32, 33. tubes 28, 29, 30, and the initial tension F
The effect of giving o is achieved by a small-diameter ram 4 provided on the remaining side of the ram flange 2 and a small-diameter cylinder 6 slidably fitted into the small-diameter ram 4.
Therefore, there is no need to house a compression spring in the chassis 1, and it can be applied to large tracked vehicles as well.

Further, the pressure oil supplied from the oil supply pipe 18 to the oil chamber 5a is general hydraulic oil and has a low viscosity. Although it is easy for grease to leak to the outside from between the large diameter cylinder 5, an annular grease filling chamber 5b is provided on the inner peripheral surface of the large diameter cylinder 5 between the oil chamber 5a and the oil leakage prevention 01J ring 11. Can prevent abnormalities from leaking to the outside.

Moreover, since the check valves 32 and 33 are provided in the oil supply pipes 29 and 30, the large diameter ram 3 moves back and the oil supply pipe 29 (or 30
) When the pressure inside the pressure increases, backflow toward the pressure reducing valve 31 can be prevented.

Therefore, a part of the pressure oil flowing from the oil pump 21 to the operation valve 22 is stored at a constant pressure in the pressure accumulation chamber 17 without affecting the pressure reducing valve 31 or the system from the oil pump 21 to the work equipment driving cylinder 27. It is something that can be done.

[Brief explanation of drawings]

Fig. 1 is a side view schematically showing the belly band adjustment and shock absorbing device of a conventional tracked vehicle, and Fig. 2 is a longitudinal side view showing its details.
FIG. 3 is an explanatory diagram of its operation, FIG. 4 is a vertical side view showing an embodiment of the track adjustment and shock absorbing device for a tracked vehicle according to the present invention, and FIG. 5 is a hydraulic circuit diagram thereof. 1... Chassis, 2... Ram flange, 3
...Large diameter ram, 4...Small diameter ram, 5.
...Large diameter cylinder, 5a...Oil chamber, 5b
...Grease filling chamber, 6...Curved medium diameter cylinder,
7. Death: Bracket, 11: 0 ring, 17: Accumulator, 18: Flexible hollow sphere, 21: Oil pump, 24: ...Operating valve, 22...Oil supply pipe between oil pump 21 and operation valve 24, 2B, 29.30...Oil supply pipe, 3
1...Reducing valve, 32.33...Check valve.

Claims (1)

[Scope of utility model registration request] The large-diameter ram provided on one side of the ram flange is slidably inserted into the large-diameter shock-absorbing cylinder, and the small-diameter ram provided on the other side of the ram flange is slidably inserted into the small-diameter cylinder for initial tension adjustment. The ram flange, the same large diameter ram, and the same large diameter cylinder are accommodated between a pair of brackets provided in the chassis, and the plurality of flexible hollow spheres are communicated with the oil chamber of the large diameter cylinder. The oil supply pipe is housed in a pressure accumulation chamber provided in a large-diameter ram, and is connected between the middle of the oil supply pipe connecting the oil pump and the operation valve, the pressure reducing valve, the check valve, and the oil chamber of the large-diameter cylinder. ,
A track adjustment and shock absorbing device for a tracked vehicle, characterized in that a grease filling chamber is formed on the inner peripheral surface of the large-diameter cylinder between the O-ring and the oil chamber.