JPS5850130Y2 - Lateral reciprocating oil shock absorber - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lateral reciprocating oil shock absorber in which a piston reciprocates in the lateral direction.

As shown in FIG. 1, a conventional horizontal oil shock absorber has a shock absorber cylinder 2 installed horizontally inside an oil pot 1, and a piston 3 is housed in the cylinder 2 so as to be able to reciprocate. houses a spring 8 that returns the piston 3;
Due to the impact force applied to the piston 3 via the piston shaft 4, the buffer oil 5 in the cylinder 2 is moved from the orifice 6 provided at the bottom of the cylinder 2 to the oil pot 1 outside the cylinder 2 as the piston 3 moves. It is designed to eject to the side, and the flow resistance generated at that time alleviates the impact force.

Further, during the compression operation of the piston 3, the buffer oil 5 is made to flow into the cylinder 2 on the rear side of the piston 3 through the oil passage 10 of the cylinder 2.

At the upper part of the oil pot 1, an air chamber 7 for adjusting the amount of oil is provided to accommodate changes in volume due to the movement of the piston rod 4 in and out.

In this device, the orifice 6 is provided below the cylinder 2 because the air chamber 7 is moved closer to the cylinder 2 in order to downsize the device, etc., so that the oil level will be lowered when the piston 3 moves suddenly. Due to the turbulence, gas flows into the cylinder 2 from the orifice 6 on the suction side.
This is to prevent this from happening.

If gas is drawn into the cylinder 2, the buffering effect will be significantly reduced.

However, in a horizontal oil shock absorber with such a structure,
Since it is possible to provide a buffering effect only on the outward journey,
For example, when used in a circuit breaker, there is a drawback that two devices must be installed, one for closing and one for shutting off, which operates in the opposite direction.

In addition, in such a conventional horizontal oil shock absorber,
When the piston 3 moves to the right in Fig. 1, the pressure in the cylinder chamber on the left side of the piston 3 becomes negative, and the gas trapped in the buffer oil in the cylinder chamber on the left turns into bubbles. Gas accumulates in the cylinder chamber of the cylinder 2, and since the cylinder 2 is oriented sideways, this gas cannot escape and remains in the cylinder chamber, gradually accumulating and reducing the buffering effect significantly.

Furthermore, in the conventional device, in order to separate the air chamber 7 and the orifice 6, the orifice 6 was concentrated only at the bottom of the cylinder 2, which had the disadvantage that the internal pressure strength of the cylinder 2 was significantly reduced. .

The purpose of the present invention is to provide a horizontal reciprocating melt that has a buffering effect on both the forward and backward paths, can prevent the buffering effect from decreasing due to residual air bubbles, and can also prevent a decrease in the internal pressure strength of the cylinder. There is an oil buffer to provide.

In the present invention, a buffer cylinder is housed horizontally in an oil pot filled with buffer oil, a buffer piston is housed in the cylinder, and the cylinder is provided with a plurality of orifices that communicate with the oil pot, In the horizontally reciprocating oil shock absorber having an oil volume adjustment air chamber provided in the upper part of the oil pot, the cylinder is provided with bubble relief holes having a diameter much smaller than the orifice at both ends of the upper part thereof, and The orifice is provided within the lower two-thirds of the diameter of the cylinder in the vertical direction, and the orifice is provided on both sides of the cylinder in the length direction.

An embodiment of the present invention will be described in detail below with reference to FIG.

Note that the same parts as in FIG. 1 are given the same reference numerals.

In this embodiment, the orifices 6 are distributed in the longitudinal direction so that they are present on both sides of the cylinder 2 in the longitudinal direction, and are provided within the lower two-thirds of the diameter of the cylinder 2 in the vertical direction.

Further, the cylinder 2 is provided with bubble relief holes 9 having a diameter much smaller than the orifice 6 at both ends of the upper portion thereof.

In such a lateral reciprocating liquid oil shock absorber, the orifices 6 are present on both sides of the cylinder 2 in the length direction, so that a shock absorbing effect can be exerted on both the outward and return paths of the piston 3.

Therefore, for example, when used as a buffer for a circuit breaker, 1
A single device can perform both the buffering action for input and for cutoff.

Furthermore, even if the cylinder chambers on the left and right sides of the piston 3 become negative pressures due to the reciprocating motion of the piston 3, and the gas trapped in the buffer oil 5 in the left and right cylinder chambers turns into bubbles, the bubbles are Air bubble release holes 9 at both ends of the upper part of the cylinder 2
It is possible to discharge the gas to the outside of the cylinder 2 more easily.

Furthermore, by providing the orifice 6 within the lower two-thirds of the diameter of the cylinder 2 in the vertical direction, it is possible to prevent the orifice 6 from being concentrated only at the bottom of the cylinder, thereby preventing a decrease in the internal pressure strength of the cylinder 2. and cylinder 2
It is possible to prevent gas from being drawn into the interior.

Furthermore, since the bubble relief hole 9 has a much smaller diameter than the orifice 6, the oil level is not disturbed by the movement of the piston 3, and the disturbance in the oil level causes gas to enter the cylinder chamber and reduce the buffering effect. There's nothing wrong.

In other words, since the bubble relief hole 9 has a small diameter, when oil passes through it, the amount of oil passing through is limited by its viscous resistance, but the bubbles once entrapped (bubbles always accumulate at the top).

), the air bubbles are ejected without much resistance to their passage, thus preventing the accumulation of air bubbles.

As explained above, the lateral reciprocating liquid oil shock absorber according to the present invention has orifices on both sides of the cylinder in the longitudinal direction, so that the damping action can be performed on both the outward and return paths of the piston. .

Therefore, when used as a shock absorbing device such as a breaker, for example, there is an advantage that one unit can perform both the buffering action for closing and for breaking. Since bubble release holes are provided at the top of each of the orifices, the diameter of which is much smaller than that of the orifice,
This has the advantage that it can solve the problem of deterioration of the buffering effect due to the accumulation of air bubbles, which is a particular problem of horizontal oil shock absorbers, without disturbing the oil level on both the outward and return trips.

Furthermore, in the present invention, since the orifice is provided within the lower two-thirds of the diameter of the cylinder in the vertical direction, it is possible to avoid concentrating the orifice only at the bottom of the cylinder, and to prevent a decrease in the internal pressure strength of the cylinder. This also makes it possible to prevent gas from being sucked into the cylinder.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional lateral reciprocating liquid oil shock absorber, and FIG. 2 is a sectional view of an embodiment of the lateral reciprocating liquid oil buffer apparatus according to the present invention. 1... Oil pot, 2... Cylinder, 3... Piston, 4... Piston shaft, 5... Buffer oil, 6... ...orifice,
7... Air chamber for oil amount adjustment, 9... Air bubble release hole.

Claims (1)

[Scope of utility model registration request] A buffer cylinder is housed horizontally in an oil pot filled with buffer oil, a buffer piston is housed in the cylinder,
In the horizontal reciprocating oil shock absorbing device, the cylinder is provided with a plurality of orifices that communicate with the cylinder and the oil pot, and an air chamber for adjusting the oil amount is provided in the upper part of the oil pot. Bubble release holes with a diameter much smaller than the orifice are provided at both ends, and the orifice is provided within the lower two-thirds of the diameter of the cylinder in the vertical direction, and the orifice is located on both sides of the cylinder in the length direction. A lateral reciprocating oil shock absorber characterized in that it is provided so as to exist together with the lateral reciprocating oil shock absorber.