JPH08200422A - Oil buffer - Google Patents

Abstract

PURPOSE: To prevent the damage to an oil buffer main body even if a force to be buffered is applied from a slanting direction. CONSTITUTION: An oil buffer main body 3 buffers by receiving the force of an operation mechanism 1 by a piston rod part 2. A linear guide mechanism 16 is provided on the piston rod part 2. The linear guide mechanism 16 is provided with a guide cylinder body 17 provided co-axially on the tip of the cylinder part 6 of the oil buffer main body 3 by surrounding the piston rod part 2, a guide slider 18 fixed on the tip of the piston rod part 2 and guided by a guide cylinder body 17 and a pressure receiver 19 for receiving the force of the operation mechanism 1 by projecting from the tip of the guide slider 18 to the outside of the guide cylinder body 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil shock absorber having an oil shock absorber body for receiving a force of an operating mechanism such as an operating mechanism of an electric power switchgear by a piston rod portion and buffering the force.

[0002]

2. Description of the Related Art FIGS. 2 and 3 show an oil shock absorber 4 having an oil shock absorber body 3 that receives a force of an operation mechanism (operation mechanism) 1 of a conventional power switchgear by a piston rod portion 2 and buffers the force. It shows the state of.

The oil shock absorber main body 3 includes a cylinder portion 6 having a screw 5 cut on the outer circumference thereof, a piston portion (not shown) which slides against the buffer oil, and a piston portion which is not shown. It has a structure including a piston rod portion 2 which is supported and transmits an external force to the piston portion. The oil shock absorber main body 3 is attached to the mounting plate 7 with a nut 8 which is passed through a cylinder portion 6 in a hole of the mounting plate 7 and screwed onto the outer periphery of the cylinder portion 6.

The operating mechanism (operating mechanism) 1 is connected to an opening / closing device drive lever 10 for driving an opening / closing device (not shown) which is rotatably supported by a bearing 9, and one end side of which is orthogonal to the drive lever 10. Switchgear drive shaft 1
1, an operating device output link 13 having one end pivotally connected to the other end of the switchgear drive shaft 11 by a pin 12, and an arc centered on the switchgear drive lever 10 rotatably supported by the pin 12. It has a structure including a roller 14 that comes into contact with the piston rod portion 2 of the oil shock absorber main body 3 during exercise.

A stopper 15 for limiting the operating range of the drive lever 10 is supported on the mounting plate 7.

Such an oil shock absorber 4 has an A on the drive shaft 11 centered on the drive lever 10 when the switchgear is operated.
When the roller 14 moves in an arc along with a sudden arc motion from the position B to the position B, the roller 14 abuts against the piston rod portion 2 of the oil shock absorber main body 3 and presses the piston rod portion 2, whereby the oil shock absorber main body 3 moves. The shock force at that time is buffered.

[0007]

However, in this case, since the roller 14 makes an arc motion and collides with the tip of the piston rod 2, the tip of the piston rod 2 is applied with a pushing force from an oblique direction. However, there is a problem that the oil shock absorber body 3 is easily damaged.

An object of the present invention is to provide an oil shock absorber capable of preventing damage to the oil shock absorber main body even if a force to be shocked is applied from an oblique direction.

[0009]

SUMMARY OF THE INVENTION The present invention is directed to an improvement of an oil shock absorber having an oil shock absorber main body for receiving a force of an operating mechanism at a piston rod portion and buffering the force.

The oil shock absorber according to the present invention is characterized in that the piston rod portion is provided with a linear guide mechanism.

In this case, the linear guide mechanism is fixed to the tip end of the piston rod portion and the guide cylinder body that surrounds the piston rod portion and is coaxially provided at the tip end of the cylinder portion of the oil shock absorber body. The guide slider may be configured to be guided by the guide cylinder body, and a pressure receiving portion protruding from the tip of the guide slider to the outside of the guide cylinder body and receiving the force of the operating mechanism. .

Further, it is preferable to interpose a slip promoting means between the guide cylinder and the guide slider.

[0013]

When the linear guide mechanism is provided on the piston rod portion of the oil shock absorber main body in this way, even if a force to be buffered is applied from an oblique direction, the action of the linear guide mechanism causes the piston rod portion of the force to be absorbed. Only the component parallel to the portion is added to the piston rod portion, and damage to the oil shock absorber main body can be prevented.

Particularly, the linear guide mechanism surrounds the piston rod portion and is provided coaxially at the tip of the cylinder portion of the oil shock absorber main body, and the guide tubular body fixed to the tip end of the piston rod portion. If the structure is provided with a guide slider that is guided by, and a pressure receiving portion that projects from the tip of the guide slider to the outside of the guide cylinder and receives the force of the operating mechanism, when the force to be buffered is applied from an oblique direction, Due to the guide action of the guide cylinder and the guide slider, only the force of the component parallel to the piston rod is applied to the piston rod.

By interposing a slip promoting means between the guide cylinder and the guide slider, the guide slider can be smoothly slid.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the oil shock absorber according to the present invention. In the oil shock absorber 4 of the present embodiment, the linear guide mechanism 16 is provided on the piston rod portion 2 of the oil shock absorber main body 3. The linear guide mechanism 16 is fixed to the tip end of the piston rod portion 2 and the guide cylinder body 17 that surrounds the piston rod portion 2 and is coaxially provided at the tip end of the cylinder portion 6 of the oil shock absorber body 3. A guide slider 18 guided by the guide cylinder 17, a pressure receiving portion 19 protruding from the tip of the guide slider 18 to the outside of the guide cylinder 17 and receiving a force of an operating mechanism, the guide cylinder 17 and the guide slider 18. It has a structure provided with a slip promoting means 20 interposed between and. In this embodiment, the guide cylinder 17 is
It is made of iron, is screwed to the tip of the cylinder portion 6, and is fixed to the cylinder portion 6 with a set screw 21 so as to be coaxially connected to the tip of the cylinder portion 6. Also,
The guide slider 18 is formed of chrome molybdenum steel, and the pressure receiving portion 19 is formed integrally with the guide slider 18. The slip promoting means 20 is formed of a linear bearing or a slide bearing alloy. The guide cylinder 17 is preferably locked by a lock nut 22 as shown.

When the linear guide mechanism 16 is provided on the piston rod portion 2 of the oil shock absorber main body 3 as described above, the force F to be absorbed is F.
Is applied diagonally, the force F is applied to the guide cylinder 17
And the guide action of the guide slider 18, only the force Fp of the component parallel to the piston rod portion 2 is generated.
Therefore, the oil shock absorber main body 3 can be prevented from being damaged. In this case, the guide cylinder 17 and the guide slider 18
Since the slip accelerating means 20 is interposed between and, the guide slider 18 can be smoothly slid.

In this example, the return of the guide slider 18 and the pressure receiving portion 19 is performed by the force of the oil shock absorber main body 3. However, when the force is insufficient, the return is made between the guide slider 18 and the cylinder portion 6. A spring can be interposed.

[0019]

As described above, in the oil shock absorber according to the present invention, since the piston guide portion of the oil shock absorber main body is provided with the linear guide mechanism, even if the force to be shocked is applied obliquely, Only the component of the force parallel to the piston rod portion is applied to the piston rod portion by the linear guide mechanism, and the oil shock absorber main body can be prevented from being damaged.

In particular, as in the second aspect of the invention, a linear guide mechanism is provided around the piston rod portion, and the guide cylinder body is provided coaxially at the tip of the cylinder portion of the oil shock absorber body.
A structure is provided that includes a guide slider that is fixed to the tip of the piston rod and is guided by the guide cylinder, and a pressure receiving portion that projects from the tip of the guide slider to the outside of the guide cylinder to receive the force of the operating mechanism. When a force to be buffered is applied from an oblique direction, the force is easily applied to the piston rod by the guide action of the guide cylinder and the guide slider, and only the component force parallel to the piston rod is applied. Can be realized.

Further, as in the third aspect of the present invention, when the slide promoting means is interposed between the guide cylinder and the guide slider, the guide slider can be smoothly slid, and the linear guide can be slid. Damage to the mechanism can also be prevented.

[Brief description of drawings]

FIG. 1 is a partially longitudinal side view of an oil shock absorber according to the present invention.

FIG. 2 is a partially longitudinal side view showing a relationship between an operating mechanism of a conventional power switchgear and an oil shock absorber.

3 is a cross-sectional view taken along line XX of FIG.

[Explanation of symbols]

 1 Power switchgear operating mechanism (operating mechanism) 2 Piston rod part 3 Oil shock absorber body 4 Oil shock absorber 5 Screw 6 Cylinder part 7 Mounting plate 8 Nut 9 Bearing 10 Switchgear drive lever 11 Switchgear drive shaft 12 Pins 13 Operator output link 14 Roller 15 Stopper 16 Linear guide mechanism 17 Guide cylinder 18 Guide slider 19 Pressure receiving part 20 Sliding promoting means 21 Set screw 22 Lock nut

Claims (3)

[Claims] 1. An oil shock absorber comprising an oil shock absorber body for receiving a force of an operating mechanism at a piston rod portion and buffering the oil, wherein the piston rod portion is provided with a linear guide mechanism. Shock absorber. 2. The linear guide mechanism is fixed to the tip of the piston rod and a guide cylinder that surrounds the piston rod and is coaxially provided at the tip of the cylinder of the oil shock absorber body. And a guide slider guided by the guide cylinder, and a pressure receiving portion protruding from the tip of the guide slider to the outside of the guide cylinder to receive the force of the operating mechanism. The oil shock absorber according to claim 1, which is characterized in that. 3. The oil shock absorber according to claim 2, wherein a slip promoting means is interposed between the guide cylinder and the guide slider.