JPS6026751B2 - Track adjustment and shock absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In a wheel with a track such as a bulldozer, a track frame is attached to the vehicle body a, as shown in FIG. A sprocket c is attached to one end of the track frame b, and an idler d is pivotally supported at the end of the track frame b via a crawler track adjustment and shock absorbing device f.
Crawler e was placed on the bridge.

The crawler track adjustment and shock absorbing device f includes, as shown in FIG. 2, a grease cylinder g that is integrally fixed to the track frame b, a piston h that is slidably fitted in the cylinder g, Bolt i fixed integrally to the same piston h
and a spring receiver i, a bracket k that pivotally supports an idler d, and a spring receiver 1 that is integrally fixed to the bracket k.
When the bracket k' is fixed to the bolt i, a sleeve m is slidably attached to the bolt i, a nut n is screwed onto the tip of the bolt i, and a spring receiver i is attached to the bolt i.
, 1, and a protective cylinder p covering the spring o.The discharge port of a manual grease pump (not shown) is connected to the grease supply hole q of the cylinder g, and the manual grease pump Initial tension was applied to the crawler belt e by operating the cylinder g to force grease into the cylinder g.

However, when the size of the conventional crawler track adjustment/buffer bag f is increased as the wheels become larger, the pressure for press-fitting the grease into the cylinder g increases, making it difficult to operate the manual grease pump. It was difficult to accurately apply the required initial tension.

The present invention relates to an improvement of a crawler track adjustment and shock absorbing device that overcomes the above-mentioned drawbacks.The present invention relates to an improvement of a crawler track adjustment and shock absorbing device that overcomes the above-mentioned difficulties. A grease pressurizer with a grease injection mechanism for supplying and pressurizing grease is provided, and the pressurizing piston side of the grease pressurizer is connected to the main system hydraulic power source via a check valve and a pressure reducing valve. The object thereof is to provide a device that can automatically supply liquid at a predetermined pressure to a cylinder so as to give the required initial tension to the track.

As described above, the present invention includes a grease pressurizer with a grease injection mechanism for supplying and pressurizing grease to the cylinder via a check valve, to the cylinder that applies initial tension to the crawler track and bears the impact load applied to the crawler track. At the same time, the pressurizing piston side of the grease pressurizer was connected to the main system hydraulic power source via a check valve and a pressure reducing valve. The pressure reducing valve and check valve allow the hydraulic pressure close to the maximum on the main system hydraulic source side to be automatically accumulated and applied to the pressurizing piston, and can be maintained, thereby reducing the influence of hydraulic pressure fluctuations on the main system hydraulic source side. The oil pressure is transmitted from the grease pressurizer to the grease in the cylinder through the pressurizing piston, and the grease pressure in the cylinder is prevented from fluctuating by the check valve and is maximized. In addition to the load characteristics, the initial tension applied to the track can be greatly improved, and furthermore,
The reduced grease pressure in the cylinder is automatically replenished, significantly improving track support performance and reliability.

In addition, in the present invention, even if the crawler track stretches due to the weight of the car bran or the amount of impact load during driving, or liquid leaks from the cylinder, the liquid is automatically replenished to the cylinder, and the track is kept under constant tension. can always be given.

Below, the present invention will be described with reference to the embodiment shown above the center line in FIG. 3 and a check valve 4 are interposed, and the pond end of the pipe 1 is connected to a grease pressurizer 5.

In addition, a pressurizing piston 6 is installed in the grease pressurizer 5 so that the pressurizing piston 6 can be used freely. is now filled.

Furthermore, the grease cylinder chamber 8 is conveyed to the buffer cylinder 1 via a check valve 10, and a shutoff valve 12 is provided near the buffer cylinder 11.

The main body 13 of the crawler adjustment and shock absorbing device equipped with the buffer cylinder 11 has the same structure as the conventional track adjustment and shock absorbing device f shown in FIG. supported.

Further, a shutoff valve 16 and an oil filter 17 are interposed in a pipe 15 branching out from between the check valve 4 and the grease pressurizer 5, and the pipe 15 is connected to a main system (not shown).

Furthermore, when a load equal to or greater than the actuation start load Fs is applied to the crawler adjustment and shock absorbing device main body 13, the spring 18 begins to shorten, and when the maximum stroke load Fm is reached, the sleeve 19 is moved to the spring holder. It is designed to collide with 20.

Furthermore, assuming that the set pressure of the pressure reducing valve 3 is Po, when the pressure inside the buffer cylinder 1 reaches the set pressure Po, an initial tension load Fo is applied to the track (not shown) by the idler 14.
=AoPo (Ao is the cross-sectional area of the buffer cylinder 11) is added, and the following relationship is established between the operation start load Fs, the maximum stroke load Fm, and the initial tension load Fo. There is.

Fo=0.1~0. is s, Fm=1.3~2. Although only one system is shown in the upper half of FIG. 3, in reality, two systems are provided, one on each side of the wheel.

Since the embodiment shown in the upper half of FIG. 3 is configured as described above, when the shutoff valves 12 and 16 are closed, the oil pressure of the main system oil pressure source (not shown) is reduced as shown in FIG. 4. Although the pressure inside the pipe 1 fluctuates over time, the pressure in the piping 1 is cut off by the pressure reducing valve 3 when the pressure exceeds the required set pressure Po, and the check valve 4 maintains this set pressure Po, and the grease pressurizer 5 is transmitted to the cylinder chamber 7 of.

In this way, the pressure P set in the cylinder chamber 7 of the grease pressurizer 5 is set.
When o is added, the grease injected into the cylinder chamber 8 from the grease inlet 9 reaches the set pressure P through the piston 6.
o, and is also transmitted to the grease in the buffer cylinder 11, and the grease in the cylinder 11 is also maintained at the set pressure Po, so an initial tension load Fo is applied to the track by the idler 14. , the required initial tension is applied to the track and maintained constant.

In this state where the initial tension is applied to the track,
If a large tension is generated in the crawler belt due to impact or vibration caused by the running of the car, the crawler adjustment and shock absorbing device main body 13 will not shorten until the load applied to the idler 14 reaches the operation start load Fs. Until the load exceeds the operation start load Fs and reaches the maximum stroke load Fm, the spring 1
8 is elastically deformed, the crawler track adjusting and shock absorbing device main body 13 is shortened, and these shocks and vibrations are buffered.

If the pressure in the buffer cylinder 11 decreases due to grease leakage during the operation of the crawler track adjustment and shock absorber main body 13, the pressure in the cylinder chambers 7 and 8 should be increased until the pressure in both cylinder chambers 7 and 8 is balanced. The pressure piston 6 moves and grease is automatically replenished into the buffer cylinder 11.

If the grease in the cylinder chamber 8 decreases, open the shutoff valve 16 and inject grease into the cylinder chamber 8 from the grease inlet 9 with a grease injection pump (not shown), and the pressurizing piston 6 will move to the left. The hydraulic oil in the cylinder chamber 7 returns to the main system via the filter 17,
In this way, the cylinder chamber 8 and the buffer cylinder 11 can be filled with grease.

Conversely, when the shutoff valve 12 is opened and the grease is discharged from the buffer cylinder 11, the idler 14 is moved back and forth.
Tracks can be removed.

Further, if the pipe 1 is ruptured, the emergency shutoff valve 2 is automatically closed to prevent hydraulic fluid from flowing out from the main system hydraulic power source.

In this manner, in the embodiment described above, the initial tension applied to the crawler belt can always be maintained at a constant value, and grease can be automatically replenished.

In the embodiment shown in the upper half of FIG. 3, the pressure reducing valve 3 is a pressure reducing valve with relief 3', the grease pressurizer 5 is a pressure increasing type grease pressurizer 5', and the small depression side of the large cylinder chamber 7' is connected to the piping 15 by a pipe 21, which is shown in the lower half of FIG. ing. The embodiment shown in the lower half of FIG. 3 not only has the same effects as the upper half embodiment, but also allows the pressure inside the buffer cylinder 1 to be higher than the set pressure of the pressure reducing valve 3'. I can do it.

In each of the embodiments shown in the upper and lower halves of FIG. 3, a predetermined initial tension can be applied to the left and right tracks separately, but if it is allowed to apply the same initial tension to the left and right tracks, , pressure reducing valves 3, 3' and pressurizers 5, 5' are 1
One piece is enough.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and may be modified in various ways without departing from the spirit of the present invention. be.

[Brief explanation of the drawing]

FIG. 1 is a side view of a wheel equipped with a conventional crawler adjustment and shock absorbing device, FIG. 2 is a longitudinal sectional plan view of the main part thereof, and FIG. An explanatory diagram illustrating the outline of each embodiment of the combined shock absorbing device, FIG. 4 is a characteristic diagram illustrating temporal changes in system oil pressure in the embodiment, and FIG. 5 is a characteristic diagram illustrating the buffer characteristics of the embodiment. It is. 1...Piping, 2...Emergency shutoff valve, 3,
3'...Reducing valve, 4...Check valve, 5,
5'... Grease pressurizer, 6, 6'... Pressurizing piston, 7, 7', 8, 8'... Cylinder chamber, 9...
... Grease inlet, 10 ... Check valve, 11
...Buffer cylinder, 12 ... Shutoff valve, 13
...Crawler track adjustment and shock absorber body, 14...
・Idler, 15...Piping, 16...Shutoff valve, 17...Oil filter, 18...Spring, 19
...Sleeve, 20 ...Spring holder, 21
·…··Piping. Departing diagram Figure 4 Figure 5 Figure N Funai butterfly

Claims (1)

[Claims] 1. A grease pressurizer with a grease injection mechanism for supplying and pressurizing grease to the cylinder via a check valve is connected to the cylinder that applies initial tension to the crawler track and bears the impact load applied to the crawler track, and A crawler track adjustment and shock absorbing device characterized in that a pressurizing piston side of a grease pressurizer is connected to a main system hydraulic power source via a check valve and a pressure reducing valve.