JPS6021912B2 - 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 Fig. 1.2. In Fig. 1, a is a car body, b is a track frame attached to the car body a, and c is a sprocket attached to one end of the track frame b. , e in Figures 1 and 2 is a tension adjustment and shock absorbing device for the crawler track, which device e is connected to a cylinder el fixed to the track frame b, a piston e2, a pressure chamber e3 behind the piston e2, and a grease supply hole e4. A spring receiver e5 and a rod e6 fixed to the above piston e2, a protective tube e7 fixed to the spring receiver e5, a nut e8 screwed to the tip of the rod e6, and a spring played in the rod e6 and the protective tube e7. A stopper elo is fixed to the spring receiver e9 and the same spring receiver e9, and is loosely connected to the rod e6.
and the compression spring el interposed between the spring receivers e5 and e9.
It is composed of:

In addition, d is an idler attached to the spring receiver e9 via the arm dl, f is the idler d and the sprocket c
The track g is a guide roller suspended between the piston e2 spring receiver e5 protection tube e7, which supplies grease or hydraulic oil from the grease supply hole e4 to the pressure chamber e3 of the cylinder el.
Move rod e6 spring receiver e9 arm dl idler d to the left to adjust the initial tension of crawler f, and if an impact above a certain value is applied to track f, idler d arm dl spring receiver c9 stopper elo is the compression spring ell
It is designed to move to the right against the force and cushion the impact. In construction machinery such as hydraulic power excavators and mining machinery such as traveling stackers, as the vehicle bran itself becomes larger, it is required to automatically maintain the initial tension of the crawler track and the buffering start load at a constant constant. However, the first
The crawler tension adjustment and shock absorbing device shown in FIG. 2 has a problem in that the above requirements cannot be met because the initial tension of the crawler track and the start load of the shock absorbing operation have to be set artificially. The present invention addresses the above-mentioned problems and includes a cylinder having a piston for supporting an idler and a floating piston, a hydraulic power source of the main system and a pressure chamber for setting the idler movement start of the cylinder formed behind the floating piston. A pressure source is provided to store a constant pressure through a pressure reducing valve and a check valve behind the pressure reducing valve in the piping connecting the piping, and a pressure source is formed between the piping between the pressure reducing valve and the check valve and each of the pistons. Tension adjustment of the waist belt characterized by comprising a pressure reducing valve provided in another pipe connecting the initial tension pressure chamber of the cylinder, and a grease replenisher provided in the same pipe behind the pressure reducing valve. The purpose of the present invention is to automatically maintain the initial tension of the crawler track and the shock absorbing operation start load at a constant value.

The above tension and load can be easily adjusted. Another object of the present invention is to provide an improved crawler track tension adjustment and damping device that can reduce oil leakage from the sill. The crawler track tension adjustment and shock absorbing device of the present invention includes a cylinder having a piston supporting an idler and a floating piston, a hydraulic power source of the main system, and an idler movement start of the cylinder formed behind the floating piston as described above. A pressure source provided to store a constant pressure through a pressure reducing valve and a check valve behind the pressure reducing valve in a piping connecting the set pressure chamber, and between the piping between the pressure reducing valve and the check valve and each of the pistons. The system is equipped with a pressure reducing valve installed in another pipe connecting the pressure chamber for initial tension of the cylinder formed in the cylinder, and a grease replenisher installed in the same pipe behind the pressure reducing valve. It is possible to automatically keep the tension and the buffer operation start load constant at all times.

Furthermore, as mentioned above, since the pressure reducing valve is divided into the pressure reducing valve for the idler movement start setting pressure chamber and the pressure reducing valve for the initial tension pressure chamber, 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. 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 a check valve, 5 is an accumulator (pressure source), 6a, 6b are cylinders, 7a
, 7b is a floating piston, 8a, 8b is an idler 9a,
10a and 10b are pressure chambers behind the floating pistons 7a and 7b for setting idler movement start, and 11a and 11b are pressure chambers for initial tension between the pistons 7a and 8a and between 7b and 8b. In the room, the above piping 1
is suitable for the pressure chambers 10a and 10b. Also 1′
is a pipe branched from the pipe 1 between the pressure reducing valve 3 and the check valve 4, 12 is the pressure reducing valve provided in the same pipe 1', 13 is a grease supply device provided in the same pipe 1', and 14 is the same A grease replenishment piston provided in the replenisher 13, 15 a grease replenishment hole provided in the replenisher 13, 1^ a pipe connecting the grease replenisher 13 and the initial tension pressure chambers 11a and 11b, 16a,
16b is a check valve provided in the same pipe 1'', 1''' is a pipe extending from the pipe 1'' between the pressure reducing valve 12 and the grease replenisher 13 to the main system, and 17 is the pipe 1, 1. The shutoff valve installed in the bypass pipe between... 18 is the above piping 1'''
The shutoff valves 19a and 19b are the shutoff valves provided on the pipe 1''.Next, the tension adjustment of the crawler track 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, when a load is applied to the idlers 9a and 9b, the operation shown in FIG. 5 is performed. That is, if the buffer operation start load is Fs, the initial tension Fo is Fo:0
．． 1~0. is s, the load at maximum stroke is Fm' or Fm
=1.3~2. It is about the size of Cape S. Set pressure P of pressure reducing valve 3
S'ma PS = grave (the sign is the cross-sectional area of the floating pistons 7a and 7b), and if the pressure Pa in the accumulator 5 becomes less than the set pressure Ps of the pressure reducing valve 3, the pressure in the main system will be reduced to the check valve 4. The pressure Pa in the accumulator 5 becomes the set pressure Ps of the pressure reducing valve 3. On the other hand, the set pressure Po of the pressure reducing valve 12 is P. : Vessel (Nao A
. Piston 8a supporting idler 9a'9b,
8b), and this pressure Po is transmitted to the grease in the grease supply device 13 via the grease supply piston 14, and the pressure P in the initial tension pressure chambers 11a and 11b is
When o' becomes lower than the pressure Po, this pressure Po is transmitted to the pressure chambers 11a, 11b via the check valves 16a, 16b, and the set pressure Po in the grease replenisher 13 and the pressure chambers 11a, 1 are changed. The pressures P in 1b become 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 16a opens, the floating piston 7a also starts moving in the above direction, and the idler movement start setting pressure The hydraulic oil in the chamber 10a moves into the accumulator 5.
The idler 9a stops when the floating piston 7a reaches the stroke end. Further, when the load is released, hydraulic oil is transferred from the accumulator 5 to the pressure chamber 10.
Returning to step a, 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 16a. In addition, when injecting grease from the grease supply hole 15, the shutoff valve 18
With this in mind, the oil from the grease replenisher 13 is returned to the main system through the pipe 1.・Also Idler-9a
, 9b to remove the crawler track, the shutoff valve 19a
, 19b is opened, and the initial tension pressure chambers 11a, 11b are opened.
Either drain the grease inside or open the shutoff valve 17 to move the floating pistons 7a, 7b backward. Furthermore, if the pipes 1, 1' break, the emergency shutoff valve 2 is automatically closed to prevent the hydraulic oil of the main system from flowing out. FIG. 6 shows a third valve that stores constant pressure through the pressure reducing valve 3.
The accumulator 5 shown in the figure is an energy storage device 2 having a casing rod 20a, a piston rod 20b, a piston 20c, and a disc spring 20d for biasing the piston 20c to the right.
At the same time, the set pressure Ps of the pressure reducing valve 3 is made higher than the set pressure Po of the pressure reducing valve 12, and the floating pistons 7a, 7b are pressed against the stepped portions provided in the cylinders 6a, 6b, thereby reducing the buffer operation starting load. Fs can be set by the initial tightening load of the disc spring 20d, and a check valve 21 is provided in the piping 1' between the pressure reducing valve 12 and the grease replenisher 13 to control the supply pressure to the grease replenisher 13. An alternative embodiment in which the tension is maintained constant can achieve the same effect as the tension adjustment and damping device of FIG. 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]

Figure 1 is a side view schematically showing a conventional crawler tension adjustment and shock absorbing device, Figure 2 is a longitudinal side view showing its details, and Figure 3 is an embodiment of the crawler tension adjustment and shock absorbing device according to the present invention. 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. FIG. 6 is a diagram showing the tension adjustment and buffering of the crawler track according to the present invention. It is an explanatory view showing other examples of a device. 1...Piping connecting the hydraulic power source of the main system and the pressure chambers 10a, 10b for setting the idler movement start, 1', 1
″...Pressure reducing valve 3 and initial tension pressure chambers 11a, 1
Piping connecting to 1b, 3, 12...Reducing valve, 4...
...Check valve, 5 or 20...Pressure source, 6a, 6
b...Cylinder, 7a, 7b...Floating piston, 8a,
8b...Idler, piston supporting 9a, 9b,
13...Grease supply device. Figure 4 Complete ↑ Figure 5 Reitsurunefuneboku

Claims (1)

[Claims] 1 A cylinder having a piston that supports an idler and a floating piston, a pressure reducing valve and a pressure reducing valve behind the piping connecting the hydraulic power source of the main system and the pressure chamber for setting the idler movement start of the cylinder formed behind the floating piston. a pressure source provided to store a constant pressure through a check valve, and another connecting the piping between the pressure reducing valve and the check valve and the pressure chamber for initial tension of the cylinder formed between each of the pistons; A crawler track tension adjustment and shock absorbing device comprising: a pressure reducing valve provided in a pipe; and a grease replenisher provided in the pipe behind the pressure reducing valve.