JPS63172031A - Forced oil supplying buffer - Google Patents

Abstract

PURPOSE:To miniaturize a cylinder and to prevent a temperature rise of pressurized oil by forcedly supplying pressurized oil into one pressure chamber from a pressure source and providing a connecting hole penetrating the other pressure chamber and the outside of the cylinder in the wall of the cylinder or a piston rod. CONSTITUTION:The inside of a cylinder 1 is divided into one pressure chamber A and the other pressure chamber B by a piston 2, pressurized oil is supplied to the pressure chamber A from a pump P, and the pressurized oil flows at a specified resistance only in the direction of the pressure chamber B from the pressure chamber A through a valve 7 installed in the piston 2. The pressurized oil flowing from the pressure chamber A to the pressure chamber B through the sidewall of a piston rod 3 is stopped by a valve 8 installed in the piston 2 and then discharged from an opening 11 in the sidewall of the piston rod 3 to the outside through an opening 10 on pressure chamber A-side of the valve 8, a throttle 13, add a connecting path 12. Thus, since the pressurized oil is discharged to the outside by sliding the piston 2, a temperature rise of the pressurized oil is prevented, and intense vibration can be eliminated by miniaturizing the cylinder, maintenance-free operation can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hydraulic shock absorber used for photographing violently vibrating bodies or installed in locations where maintenance is difficult.

(Prior Art) A conventional hydraulic shock absorber, for example, as shown in FIG. 2, uses a piston 2 that slides inside a cylindrical cylinder 1 to
The interior is divided into two pressure chambers A and B, and the pressure chamber ASB is filled with pressure oil, and a piston rod 3 extending from the piston 2 protrudes from the end of the cylinder 1. piston 2
is provided with a valve 4 that generates a damping force when oil flows from the pressure chamber to the pressure chamber B and/or in the opposite direction.

In addition, one end of the cylinder 1 has a groove 1 on its inner wall, for example.
A is provided in the groove 1a, and an accumulator 5 made of a closed foam sponge or the like is provided in the groove 1a, and the accumulator 5 compensates for the volume of entry and exit of the piston rod 3.

In the conventional hydraulic shock absorber described above, a seal 6 is provided on the sliding surfaces of the piston rod 3 and the cylinder 1 to prevent oil leakage, but it is difficult to prevent oil from leaking completely. When oil leakage occurs, the accumulator 5 expands and reduces the volume of the pressure chamber A by the differential of the leaked pressure oil, preventing air from entering the cylinder 1 and obtaining the necessary buffer performance.

(Problem to be solved by the invention) However, according to the above conventional example, the accumulator 5
There is a limit to the amount of change in volume within the cylinder 1 that can be compensated for by the amount of change in volume that can be compensated for, and when there is more oil leaking from the bottle than the amount of change in volume that can be compensated for, air enters into the cylinder 1 from the outside and the desired buffer performance is achieved. Therefore, there was a problem in that the amount of pressure oil had to be periodically inspected.

Further, since the conventional hydraulic shock absorber has a structure that seals the pressure oil, when the piston rod moves violently, the pressure oil becomes hot and the hydraulic Iff body becomes overheated. In order to prevent this, it is necessary to increase the size of the cylinder in order to obtain a large heat dissipation area, which poses the problem of increasing the size of the hydraulic yU shocker.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hydraulic shock absorber that always maintains a desired shock absorbing performance and prevents overheating of pressure oil within a cylinder.

(Means for Solving the Problems) In order to solve the problems of the conventional example, the present invention divides the inside of the cylinder into two pressure chambers by a piston that slides inside the cylinder, and supplies pressure oil to the pressure chambers. In a hydraulic shock absorber in which a piston rod extending from the piston protrudes outside the cylinder, pressure oil is forcibly supplied from a pressure source to the one pressure chamber, and the pressure chamber and the piston rod are connected to the cylinder wall or the piston rod. It is characterized by providing a communication hole that penetrates the cylinder outside.

(Function) Since the present invention is configured as described above, when the piston rod moves and the piston slides inside the cylinder, pressure oil is always supplied to one pressure chamber, so that the desired VI impact performance can be achieved. At the same time, pressure oil is discharged to the outside of the cylinder from a communication hole provided in the cylinder wall or piston rod, thereby dissipating heat from the shock absorber.

(Example) An example of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory cross-sectional view of a forced oil supply shock absorber according to the present invention, and parts having the same configuration as a conventional hydraulic shock absorber are given the same reference numerals and their explanations will be omitted.

A valve 7 provided on the piston 2 is a check valve that allows pressure oil to flow only from the pressure chamber A to the pressure chamber B, and creates a predetermined resistance when the pressure oil flows from the pressure chamber A to the pressure chamber B. Further, a valve 8 is provided in the inner shaft of the piston 2, and the valve 8 communicates with the pressure chamber B from the side wall of the piston rod 3. Valve 8 is a check valve that allows pressure oil to flow from pressure chamber B only to pressure 'IA, and creates a predetermined resistance when oil flows from pressure chamber B to pressure chamber A.

A hole 9 is provided at the bottom of the cylinder 1 on the pressure chamber A side, and pressure oil is constantly forcibly supplied through the hole 9 from a pressure oil supply source such as a pump P or a pressurized tank. A communication hole 12 having an opening 11 is provided in the side wall of the piston rod 3, passing through the piston rod 3 through the opening 10 on the pressure chamber A side of the valve 8, so that the pressure oil in the pressure chamber A is discharged to the outside of the shock absorber. Configure it as possible. A throttle 13 is provided near the opening 11 of the piston rod 3 so that the amount of pressure oil discharged to the outside can be adjusted.

Connect the end of the piston rod 3 to the primary side and connect the cylinder 1
When the bottom of the secondary side is used to obtain a buffering effect between the two,
When the primary side and the secondary side are separated, pressure chamber B becomes high pressure and pressure chamber A becomes low pressure, and pressure oil flows from pressure chamber B to pressure chamber A via valve 8, and from the pressure oil supply source to hole 9. Low temperature pressure oil is supplied to the pressure chamber through. and valve 8
A buffering effect is obtained on the primary and secondary sides due to the resistance when the pressure oil flows.

Also, when the primary side and the secondary side approach, pressure chamber A becomes high pressure and pressure chamber B becomes low pressure, pressure oil flows from pressure chamber A to pressure vB via valve 7, and is buffered by the resistance when pressure oil flows. At the same time, a part of the pressure oil in the pressure chamber A flows through the opening 1.
It enters the communication hole 12 from o and is discharged to the outside of the shock absorber from the opening 11. In the above case, if the rise in pressure oil in pressure chamber Δ is large, there is a risk that the pressure oil will flow back toward the pressure oil supply source, so in such a case, the It is necessary to install a valve to prevent backflow.

In this way, low-temperature pressure oil is supplied from the pressure oil supply source, and high-temperature pressure oil that flows through valves 7 and 8 is discharged to the outside of the shock absorber. Therefore, by sliding the cylinder 1, a part of the pressure oil filled in the cylinder 1 can be replaced with low-temperature pressure oil, and the amount can be arbitrarily set by adjusting the amount of restriction of the throttle 13.

Therefore, in order to use a large amount of power in a small cylinder, the passages of valves 7 and 8 are narrowed, and even if the temperature of the pressure oil increases, by constantly supplying low-temperature pressure oil, the pressure oil can be circulated and the shock absorber can be maintained. Prevent temperature rise.

Incidentally, in the above embodiment, an ambidextrous shock absorber was described;
It may be a one-handed buffer.

According to this embodiment, pressure oil is discharged from the opening 11 and adheres to the circumference of the piston rod 3. However, in a shock absorber used for a rotating machine such as a flexible joint, pressure oil Even if it is discharged to the outside, no inconvenience will occur. In addition, gears and bearings are used as parts of the rotary machine, and since the oil used in these and the pressure oil in the rotator is the same, the adhesion of pressure oil also has the effect of smoothing movement.

In addition, even if pressure oil leaks from the sliding motion between the piston rod 3 and the cylinder 1, the pressure oil is forcibly supplied to the cylinder 1.
The amount of pressure oil inside is always appropriate and does not cause a decrease in buffer performance.

In this embodiment, the communication hole 12 is provided in the piston rod 3, but it is provided in the side wall of the cylinder 1 so that the pressure chamber A or the pressure "4!B" is
It is also possible to have a configuration in which the pressure chamber is communicated with the outside of the cylinder so that the hydraulic pressure in the pressure chamber can be discharged to the outside.

(Effects of the Invention) The present invention is configured to supply pressurized oil to the pressure chamber from a pressure source, and to provide a communication hole in the cylinder wall or piston rod that penetrates the pressure chamber and the outside of the cylinder. Since the pressure oil is discharged to the outside as it slides, the pressure oil inside the cylinder circulates and prevents the temperature of the pressure oil from rising.The cylinder chamber is always forcibly supplied with oil, so it can be used regularly. Desired buffer performance can be maintained without conducting regular inspections.

Therefore, it is possible to cope with severe vibrations with a small cylinder, and a maintenance-free hydraulic shock absorber can be produced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view showing an embodiment of the present invention, and FIG. 2 is an explanatory cross-sectional view of a conventional hydraulic shock absorber. 1......Cylinder 2...Piston 3...Piston Ron door, 8...
......Valve 9...Bore 12...Communication holes A, B...Pressure Room P・・・・・・・・・Pump Filed on August 7, 1986 Person Ishikawajima Harima Heavy Industries Co., Ltd. Figure 1

Claims (1)

[Claims] A piston that slides inside the cylinder moves the inside of the cylinder two ways.
In a hydraulic shock absorber, the pressure chambers are divided into two pressure chambers, the pressure chambers are filled with pressure oil, and a piston rod extending from a piston projects outside the cylinder, wherein one pressure chamber is forcibly supplied with pressure oil from a pressure source. 1. A forced oil supply shock absorber, characterized in that a cylinder wall or a piston rod is provided with a communication hole through which a pressure chamber and the outside of the cylinder are penetrated.