JPS5946830B2 - Crawler tension adjustment and shock absorbing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a track tension adjustment and shock absorbing device.

A conventional crawler track tension adjustment and shock absorbing device will be explained with reference to Figs. 1 and 2. In Fig. 1, a shows a car body, b shows a track frame attached to the car body a, and C shows a sprocket attached to one end of the track frame b. , e in Figs. 1 and 2 is a tension adjustment and shock absorbing device for the crawler track, and the device e includes a cylinder e1 and a piston e2 fixed to the track frame b, a pressure chamber e3 behind the piston e2, and a grease supply hole e4. A spring receiver e fixed to the piston e2, a protective tube e7 fixed to the rod e6 and the spring receiver e5, a nut e8 screwed to the tip of the rod e6, loosely fitted into the rod e6 and the protective tube e7. A stopper eto is fixed to the spring receiver e, and the same spring receiver e9, and is loosely fitted to the rod e6.
and a compression spring ell interposed between the spring receivers e5 and e9.

In addition, d is an idler attached to the spring receiver e through the arm d1, f is a crawler track suspended between the idler d and the sprocket C, and g is a guide roller, which is supplied with grease or hydraulic oil. The pressure chamber e3 of the cylinder e1 is supplied from the hole e5, and the initial tension of the crawler track f is adjusted by moving the piston e2, the spring receiver e, the protective tube e70, the spring receiver e, the arm d1, and the idler d to the left. ,
Moreover, if an impact of more than a certain value is applied to the crawler track f, the idler d arm d1 spring receiver 1d e g stopper eto moves to the right against the compression spring e1□ to alleviate the impact.

With construction machinery such as hydraulic power shovels and mining machinery such as traveling stackers, as the vehicles themselves become larger,
It is required to automatically maintain the initial tension of the crawler track and the shock absorbing start load at a constant value.
The crawler tension adjustment and shock absorbing device shown in the figure has a problem in that the above requirements cannot be met because the initial tension of the crawler track and the shock absorbing start load have to be set artificially.

The present invention addresses the aforementioned problems and includes: a cylinder having a piston supporting an idler and a floating piston;
A pressure source installed to store a constant pressure through a pressure reducing valve in the piping connecting the hydraulic power source of the main system and the pressure chamber for setting the start of idler movement behind the floating piston, the pressure chamber for setting the start of idler movement, and the main system. A pressure regulating valve provided in a pipe connecting the drain, a pressure reducing valve and a grease replenisher provided in the pipe connecting the pressure reducing valve and the initial tension pressure chamber between each piston, and a grease chamber of the grease replenisher. Or, it pertains to a crawler tension adjustment and shock absorbing device characterized by comprising a pressure regulating valve installed in a pipe communicating with the grease chamber, the purpose of which is to control the initial tension of the crawler track and the load at which the buffer operation begins. It can be kept constant and automatically.

The above tension and load can be easily adjusted.

Oil leakage from the cylinder can be reduced.

Damage to piping and equipment can be prevented.

Another object of the present invention is to provide an improved crawler track tension adjustment and shock absorbing device that does not generate excessive initial tension.

The track tension adjustment and damping device of the present invention connects a cylinder having a piston supporting an idler and a floating piston as described above, a hydraulic pressure source of the main system and a pressure chamber behind the floating piston for setting the idler movement start. A pressure source installed in piping to store a constant pressure through a pressure reducing valve,
A pressure regulating valve provided in a pipe connecting the idler movement start setting pressure chamber and the main system drain, a pressure reducing valve and grease provided in a pipe connecting the pressure reducing valve and the initial tension pressure chamber between each piston. Since it is equipped with a replenisher and a pressure regulating valve installed in the grease chamber of the grease replenisher or the piping that communicates with the grease chamber, the initial tension of the crawler track and the starting load for buffer operation are always kept constant and automatically maintained. It is something that can be done.

In addition, as mentioned above, the pressure reducing valve is divided into the pressure reducing valve for the pressure chamber for setting the idler movement start and the pressure reducing valve for the initial tension pressure chamber, so the tension and load can be easily adjusted. It is something.

Further, as described above, since the grease supply device is provided in the pipe extending to the initial tension pressure chamber to fill the pressure chamber with grease, oil leakage can be reduced.

Also, when the floating piston is under load through the idler, the piston that supports it, and the grease layer behind it, if the gas from the pressure source (accumulator) is released,
The pressure in the piping system that connects the pressure chamber for setting the start of idler movement and the pressure source becomes extremely high and damages them, but as mentioned above, the pressure in the piping system connecting the pressure chamber for setting the start of idler movement and the main system drain is A pressure regulating valve is installed in the
Since the pressure in the piping system is not raised above the set pressure of the synchronized pressure valve, damage to the piping and equipment can be prevented.

When replenishing grease, the grease supply hole provided in the grease supply device is opened and grease is injected into the grease chamber of the grease supply device, but the grease supply piston provided in the grease supply device reaches the end of its stroke. If injection is continued afterwards, excessive initial tension will be generated, but as mentioned above, a pressure regulating valve is installed in the grease chamber of the grease replenisher or in the piping that communicates with the grease chamber, and the pressure in the grease chamber is controlled by the pressure regulating valve. Since the pressure is not increased above the set pressure, excessive initial tension is not generated.

Next, the crawler tension adjustment and shock absorbing device of the present invention will be explained with reference to an embodiment shown in FIG. Pressure reducing valve, 4 is check valve, 5 is accumulator (pressure source), 6
a, 6b are cylinders, 7a, γb are floating pistons, 8
Piston 10a, a, sb supporting idlers 9a, 9b.

10b is a pressure chamber for setting the start of idler movement behind the floating pistons 7a and 7b, 11a and 11b are pressure chambers for initial tension between the pistons 7a and 8a and between 7b and 8b, and the piping 1 is It communicates with pressure chambers 10a and 10b.

Also 12a. 12b is a track frame web, 13a
, 13b are bearing guides provided on the track frame webs 12a and 12b, 14a and 14b are stoppers,
15a, 15b are stopper mounting bolts, 16a, 16
1' is a pipe branched from the pipe 1 between the pressure reducing valve 3 and the check valve 4, and 17 is a pressure reducing valve provided in the pipe 1'. , 18 is a check valve provided in the same piping 1', 19 is a grease replenisher provided in the same piping 1', 20 is a grease replenishing piston provided in the same replenisher 19, and 21 is provided in the same replenisher 19. 22 is a grease chamber in the replenisher 19,
23 is the hydraulic oil chamber in the replenisher 19, 1'' is the hydraulic oil chamber 23 and the pressure chamber 10a for setting the idler movement start,
A pipe extending from iob to the main system drain, 24 a pressure regulating valve installed in a bypass pipe connecting the pipe 1'' and the pipe 1' near the accumulator 5, and 25 a pressure regulating valve for the grease chamber 22 and the initial tension. Pressure regulating valves 26a and 26b are check valves provided in the pipe 1'' communicating with the pressure chambers 11a and 11b, and cutoff valves 27 to 31 are provided.

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

When the pipe 1 is connected to the main system hydraulic source, the pressure shown in FIG. 4 is obtained.

On the other hand, if a load is applied to the idlers 9a and 9b,
The operation shown in FIG. 5 is performed.

That is, when the buffer operation start load is (Fs), the initial tension (Fo) is Fo='0.1 to 0, and the load (Fm) at the maximum stroke is Fm-1, 3 to 2. OFs
That's about it.

The set pressure (7a, 7b) of the pressure reducing valve 3 is the set pressure (7a, 7b), and the pressure (Pa) in the accumulator 5 is the set pressure of the pressure reducing valve 3 (
Ps), the main system pressure is transmitted to the accumulator 5 via the check valve 4, and the pressure (Pa) in the accumulator 5 becomes the set pressure (Ps) of the pressure reducing valve 3 (Ao is the idler Piston 8a supporting 9a, 9b
, ab), and this pressure (Po) is transmitted to the grease in the grease chamber 22 via the grease replenishment piston 20, and the pressure in the initial tension pressure chambers 11a and 11b (
If Po') becomes below the above pressure (Po), this pressure (
Po) is connected to the pressure chamber 11 through the check valves 26a and 26b.
a, 11b, the set pressure (Po) in the grease replenisher 19 and the pressure (Po) in the pressure chambers 11a, 11b are set.
') are equal.

Note that if pressure loss occurs in the pipeline, it is necessary to set the pressure in consideration of that loss.

After the above settings are made, when the idler 9a receives a load and starts moving to the left, the check valve 26a opens, the floating piston 7a also starts moving in the above direction, and the idler movement start setting pressure chamber The hydraulic oil inside 10a moves into the accumulator 5.

The idler 93 stops when the upper floating piston 7a reaches the stroke end.

When the load is removed, the hydraulic oil returns from the accumulator 5 to the pressure chamber 10a, and the idler 9a returns to its original state.

At this time, if Pa<Ps and Po'<Po, the check valve 4
Alternatively, pressure is replenished by 26a.

Also, when injecting grease from the grease supply hole 21,
Open the shut-off valve 29 and close the grease supply device 19 (hydraulic oil chamber 2).
3) so that the hydraulic oil is returned to the main system via pipe 1''.

In addition, when retracting the idlers 9a and sb to remove the tracks, either open the shutoff valves 30 and 31 to discharge the grease in the initial tension pressure chambers 11a and 11b, or
．． 28 is opened so that the floating pistons 7a, 7b are retracted.

Furthermore, when the crawler track is removed, when pressure is applied to the grease chamber 22, the pistons 8a, 8b and idlers 9a, 9b escape from the cylinders 6a, 6b, but the stopper 14
a, 14b, which can prevent this.

Note that the above escape is based on the maximum volume (Vo) of the grease chamber 22.
is the maximum volume of the initial tension pressure chambers 11a and 11b (Vo'
) may be prevented.

Furthermore, if the pipes 1, 1' break, the emergency shutoff piece 2 is automatically closed to prevent the hydraulic oil of the main system from leaking out.

In addition, when venting air from the system of pipes 1 and 1/, open the shutoff valves 27, 28, and 29, and
' and the pipe 1'' are communicated with each other, and hydraulic oil is supplied to the pipe 1.

In addition, when venting air from the piping 1'' system, open the shutoff valves 30 and 31 and pour grease into the grease supply hole 2.
1.

Also, idlers 9a and 9b, pistons 8a and 8b that support them, and a pressure chamber 11a for initial tension.

The floating piston 7a via the grease layer in 11b.

When the gas in the accumulator 5 is released while a load is applied to the idler movement start setting pressure chamber 10
The pressure in the piping system 1 that connects the accumulator 5 with the accumulator 5 becomes extremely high, but the piping that connects the idler movement start setting pressure chamber 10a with the main system drain (pipes 1 and 11" A pressure regulating valve 24 is provided in the connecting bypass pipeline), and the pressure in the system of the piping 1 is not allowed to rise above the set pressure of the regulating pressure valve 24.

Therefore, damage to piping and equipment can be prevented.

'Also, when replenishing grease, the grease supply hole 21 is opened and grease is injected into the grease chamber 22. However, if the grease replenishment piston 20 provided in the grease replenisher 19 reaches the stroke end, the injection is continued. Although excessive initial tension is generated, a pressure regulating valve 25 is provided in the piping communicating with the grease chamber 22, and the pressure (Po) in the grease chamber 22 is not raised above the set pressure of the synchronized pressure valve 25.

Therefore, it is possible to prevent the generation of excessive initial tension.

FIG. 6 shows another embodiment in which a grease nipple 32.33 is provided in place of the shutoff valve 30.31 shown in FIG. 3, a filter 34 is provided in pipe 1'', and the system of pipe 1' is divided into left and right systems. , FIG. 7 shows still another embodiment in which the system of the piping 1 after the pressure reducing valve 3 is divided into left and right systems, and in both cases, the third
It can achieve the same effect as the tension adjustment and damping device shown in the figure.

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 that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

FIG. 1 is a side view schematically showing a conventional crawler tension adjustment and shock absorbing device, FIG. 2 is a longitudinal side view showing details thereof, and FIG. 3 is an implementation of the crawler tension adjustment and shock absorbing device according to the present invention. An explanatory diagram showing an example, FIG. 4 is an explanatory diagram showing the relationship between system oil pressure and time, FIG. 5 is an explanatory diagram showing the relationship between load and stroke, and FIG. FIG. 7 is an explanatory diagram showing another embodiment of the shock absorber. FIG. 7 is an explanatory diagram showing still another embodiment. 1...Piping connecting the hydraulic power source of the main system and the idler movement start setting pressure chambers 10a, 10b, 1/. 1"...pressure reducing valve 3 and initial tension pressure chamber 11a,
Piping connecting to 11b, 3...Reducing valve, 5 or 5a, 5b...Pressure source, 6a, 6b...
・Cylinder, 7a+7b...Floating piston, 8
a, 8b...Piston supporting idlers 9a, 9b, 17 or 17a, 17b-pressure reducing valve, 19 or 19a. 19b... Grease replenisher, 22... Grease chamber, 25 or 25a, 25b... Pressure regulating valve.

Claims (1)

[Claims] 1 A cylinder having a piston that supports an idler and a floating piston, installed so as to store a constant pressure through a pressure reducing valve in the piping connecting the main system's hydraulic power source and the pressure chamber for setting the idler movement start behind the floating piston. A pressure source, a pressure regulating valve provided in a pipe connecting the idler movement start setting pressure chamber and the main system drain, and a pressure reducing valve provided in a pipe connecting the pressure reducing valve and the initial tension pressure chamber between each piston. A crawler track tension adjustment and shock absorbing device characterized by comprising a valve, a grease replenisher, and a pressure regulating valve provided in a grease chamber of the grease replenisher or a pipe communicating with the grease chamber.