JP4020745B2 - Shock absorber lock mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lock mechanism of a shock absorber used for a seismic isolation mechanism of a building.
[0002]
[Prior art]
Conventionally, a seismic isolation mechanism has been known as a device for reducing the impact of an earthquake.
The aseismatic means, for example as shown in FIG. 4, is interposed a laminated rubber isolator 3 between the building 1 and the base 2. The laminated rubber isolator 3 allows the relative displacement in the horizontal direction between the building 1 and the foundation 2 to be absorbed so as to absorb the shaking of the earthquake. Further, the building 1 and the foundation 2 side are linked through the shock absorber 4, and the vibration of the building 1 is quickly absorbed by the damper function of the shock absorber 4.
If such a seismic isolation mechanism is used, even if a large shake occurs due to the earthquake, the horizontal shake of the building 1 is little, and this shake is quickly attenuated by the shock absorber 4. The adverse effects of earthquakes can be prevented.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 11-325178 (Pages 2 to 5, FIGS. 1 to 5)
[0004]
[Problems to be solved by the invention]
Since the building 1 using the seismic isolation mechanism is allowed to move in the horizontal direction with respect to the foundation 2, if a strong wind like a typhoon acts on the building 1, the building 1 is shaken. That is, there is a problem that the habitability of the building 1 is impaired by the influence of the wind.
Therefore, in order to prevent the building 1 from shaking due to strong winds or the like, it is conceivable to connect the building 1 and the foundation 2 with a rigid body. However, if it does in this way, since the seismic isolation function by laminated rubber isolator 3 will not be exhibited, building 1 and foundation 2 cannot be connected with a rigid body.
An object of the present invention is to provide a lock mechanism for a shock absorber that can solve the above-described problems by locking the operation of the shock absorber as necessary.
[0005]
In this invention, the cylinder tube is partitioned into two chambers by a piston, a shock absorber in which both chambers are communicated with each other via a damping valve, and one is fixed to the piston rod of the shock absorber, while the other is A gripping member disposed on the outer periphery of the cylinder tube, a ball holding member and a regulating member provided between the gripping member and the cylinder tube and movable with respect to the gripping member and the cylinder tube, and a ball holding member and a grip A first pressure chamber defined by a member, a second pressure chamber defined by a regulating member and a gripping member, a pressure supply means for supplying pressure oil to the first and second pressure chambers, and a ball A ball incorporated in a through-hole formed in the holding member, a spring interposed between the ball holding member and the regulating member, and the cylinder tube A position sensor for detecting the position of the wheel holding member, and a recess formed on the outer periphery of the cylinder tube, the state where a part of the ball is fitted in the recess is held by the regulating member, and the first and second The movement of the ball holding member and the regulating member relative to the gripping member is regulated by the pressure action in the pressure chamber, and the relative movement between the cylinder tube and the piston rod is regulated.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show an embodiment of the present invention.
As shown in FIG. 1, a piston 11 is slidably incorporated in the cylinder tube 10, and the cylinder tube 10 is partitioned into two chambers 12 and 13 by the piston 11.
The piston 11 incorporates a first damping valve 14 and a second damping valve 15, and communicates the chambers 12 and 13 through the first and second damping valves 14 and 15. The first damping valve 14 allows only the flow from one chamber 12 to the other chamber 13 while applying flow resistance, and the second damping valve 15 allows the second damping valve 15 to pass from the other chamber 13 to the one chamber 12. Only the distribution to is allowed while giving flow resistance.
A piston rod 20 is fixed to the piston 11.
[0008]
A tank 16 is formed in the cylinder tube 10. The tank 16 communicates with one chamber 12 through an orifice 17. The tank 16 also communicates with the other chamber 13 via a third damping valve 18 and a check valve 19. The third damping valve 18 allows only inflow from the other chamber 13 to the tank 16 while providing flow resistance. The check valve 19 permits only the flow from the tank 16 side to the other chamber 13 side.
[0009]
Although the shock absorber A is configured by the above configuration, when the shock absorber A extends and the piston 11 moves to the left in the figure, the pressure oil in one chamber 12 passes through the first damping valve 14. It flows into the other chamber 13 side. At this time, the moving speed of the piston 11 is decelerated by the flow resistance generated in the first damping valve 14. Since the flow rate of the other chamber 13 is insufficient by the volume of the piston rod 20, the shortage is supplied from the tank 16 to the other chamber 13 via the check valve 19.
[0010]
Contrary to the above, when the shock absorber A contracts and the piston 11 moves to the right, the pressure oil in the other chamber 13 flows into the one chamber 12 via the second damping valve 15 and the third damping valve. It is discharged to the tank 16 through 18. The moving speed of the piston 11 is decelerated by the flow resistance generated by the second and third damping valves 15 and 18.
As described above, the shock absorber A exhibits its damper function when expanding and contracting.
[0011]
A cylindrical gripping member 21 is provided on the outer periphery of the cylinder tube 10 of the shock absorber A. One of the gripping members 21 is fixed to the piston rod 20. Therefore, the gripping member 21 moves integrally with the piston rod 20.
A cylindrical ball holding member 23 and a cylindrical regulating member 24 are assembled between the gripping member 21 and the cylinder tube 10. The ball holding member 23 and the regulating member 24 are slidably movable with respect to the gripping member 21 and the cylinder tube 10.
[0012]
As shown in FIG. 2, the ball holding member 23 has an annular convex portion 23a. The first pressure chamber a is partitioned by bringing the outer periphery of the annular convex portion 23 a into contact with the inner periphery of the enlarged diameter portion 21 a formed in the guide portion 21.
A plurality of through holes 25 are formed in the ball holding member 23, and balls 26 are incorporated in the through holes 25, respectively. A part of each ball 26 fits into an annular recess 27 formed on the outer periphery of the cylinder tube 10.
[0013]
On the other hand, the restricting member 24 also has an annular convex portion 24a. And the 2nd pressure chamber b is defined by making the outer periphery of this cyclic | annular convex part 24a contact the inner periphery of the enlarged diameter part 21a of the guide part 21. As shown in FIG.
Further, the restricting member 24 is formed with an enlarged portion 24b so that the left end side of the ball holding member 23, that is, a portion holding the ball 26 enters the enlarged portion 24b. When the portion holding the ball 26 enters the enlarged portion 24b in this way, the restricting member 24 closes the through hole 25 and pushes one end of the ball 26 toward the cylinder tube 10 side. A part of the extruded ball 26 is fitted into the annular recess 27. The movement of the ball holding member 23 relative to the cylinder tube 10 is restricted by maintaining a state in which a part of the extruded ball 26 is fitted in the annular recess 27.
[0014]
A spring 34 is interposed between the annular convex portion 23 a of the ball holding member 23 and the annular convex portion 24 a of the regulating member 24. Then, due to the elastic force of the spring 34, a force in a direction away from each other is applied to the ball holding member 23 and the regulating member 24.
[0015]
On the other hand, a pressure supply means B comprising four solenoid valves 35 to 38 is connected to the first pressure chamber a and the second pressure chamber b.
When the solenoid valve 35 of the pressure supply means B is switched to the open position, the pressure oil is supplied to the first pressure chamber a. Further, when the solenoid valve 36 is switched to the open position, the pressure oil is supplied to the second pressure chamber b. 1 and 2 show a state in which pressure oil is supplied to the first and second pressure chambers a and b in this way.
[0016]
When the first and second pressure chambers a and b are filled with the pressure oil as described above, the movement of the ball holding member 23 and the regulating member 24 with respect to the gripping member 21 is regulated. In addition, at this time, since the movement of the ball holding member 23 with respect to the cylinder tube 10 is restricted by the ball 26 as described above, the movement of the gripping member 21 with respect to the cylinder tube 10 is restricted. One of the gripping members 21 is fixed to the piston rod 20.
Therefore, when the movement of the gripping member 21 with respect to the cylinder tube 10 is restricted as described above, the relative movement between the cylinder tube 10 and the piston rod 20 is restricted. When the relative movement between the cylinder tube 10 and the piston rod 20 is restricted in this way, the shock absorber A cannot be expanded and contracted, so that the operation of the shock absorber A is locked.
[0017]
On the other hand, when the solenoid valve 37 is switched to the open position, the first pressure chamber a becomes the tank pressure. When the solenoid valve 38 is switched to the open position, the second pressure chamber b becomes the tank pressure. When the pressure chambers a and b are set to the tank pressure in this way, as shown in FIG. 3, the restricting member 24 is moved in the left direction by the elastic force of the spring 34 and the ball holding member 23 is moved in the right direction. Moving. Further, when the ball holding member 23 moves, a part of the ball 26 is pushed out from the annular recess 27, so that the ball holding member 23 can move with respect to the cylinder tube.
In this way, since the relative movement between the gripping member 21 and the cylinder tube 10 is allowed, the shock absorber A can be expanded and contracted, and the operation lock is released.
[0018]
The ball holding member 23 is provided with a position sensor 39. The position sensor 39 detects the number of graduated scales 40 formed on the outer periphery of the cylinder tube 10 and specifies the position of the ball holding member 23 with respect to the cylinder tube 10. The position of the ball holding member 23 with respect to the cylinder tube 10 is specified in order to align the position of the ball 26 with the annular recess 27. Details will be described later.
Reference numerals 30 to 33 in FIGS. 1 to 3 denote seal members, and the seal members 30 to 33 prevent the pressure oil in the first and second pressure chambers a and b from leaking to the outside.
[0019]
Next, the procedure for locking the operation of the shock absorber A from the state shown in FIG. 3 will be described.
First, the solenoid valve 35 is switched to the open position. Thus, when the solenoid valve 35 is switched to the open position, the oil discharged from the pump P is supplied to the first pressure chamber a. When pressure oil is supplied to the first pressure chamber a in this way, the ball holding member 23 moves in the left direction in the drawing while bending the spring 34. At this time, the position of the ball holding member 23 with respect to the cylinder tube 10 is specified by the position sensor 39, and the position of the through hole 25 of the ball holding member 23 is matched with the position of the annular recess 27 formed in the cylinder tube 10. That is, the ball 26 is moved to a position facing the annular recess 27. When the positions of the ball 26 and the annular recess 27 coincide with each other in this way, the solenoid valve 35 is switched to the closed position and the state is maintained.
[0020]
When pressure oil is supplied to the first pressure chamber a as described above, thrust in the right direction of the drawing acts on the gripping member 21, but by setting the spring force of the spring 34 to be small, the gripping member 21 is driven by this thrust. Does not move to the right. That is, the gripping member 21 is fixed to the piston rod 20, and the condition for moving the gripping member 21 is a thrust force that moves the piston 11 fixed to the piston rod 20 to the right with respect to the cylinder tube 10. However, it is a case where it acts on this gripping member 21.
[0021]
The piston 11 does not move to the right unless a pressure higher than the set pressure of the second damping valve 15 is generated in the chamber 13. That is, even if pressure oil is supplied to the first pressure chamber a, if the pressure in the chamber 13 is equal to or lower than the set pressure of the second damping valve 15, the gripping member 21 does not move.
In this embodiment , the spring force of the spring 34 is set so that the ball holding member 23 moves at a pressure equal to or lower than the set pressure of the second damping valve 15. Therefore, even if pressure oil is supplied to the first pressure chamber a as described above, the gripping member 21 does not move, and only the ball holding member 23 moves.
[0022]
When the ball holding member 23 is moved to hold the ball 26 at a position opposite to the annular recess 27, the solenoid valve 36 is switched to the open position to supply pressure oil to the second pressure chamber b. When pressure oil is supplied to the second pressure chamber b, the regulating member 24 moves to the right in the figure while bending the spring 34. If pressure oil is supplied to the second pressure chamber b, a thrust in the left direction of the drawing acts on the gripping member 21, but for the same reason as described above, the gripping member 21 does not move and only the regulating member 24 moves. I am doing so.
[0023]
As shown in FIG. 2, when the regulating member 24 moves to the position where the right end thereof is pressed against the annular convex portion 23a of the ball holding member 23, the solenoid valve 36 is returned to the closed position. In this way, as described above, the movement of the ball holding member 23 and the regulating member 24 relative to the gripping member 21 is restricted, and the movement of the cylinder tube 10 relative to the ball holding member 23 is restricted. The relative movement between 10 and the piston rod 20 is restricted.
Therefore, the operation of the shock absorber A is locked, and the damper function is not exhibited.
[0024]
When the solenoid valves 37 and 38 are switched to the open position from the above state and the first and second pressure chambers a and b are communicated with the tank T, the pressure in the pressure chambers a and b decreases. Therefore, the regulating member 24 moves leftward by the elastic force of the spring 34. Thus, when the regulating member 24 moves to the left and the through hole 25 opens, the ball holding member 23 moves to the right while pushing out the ball 26 from the annular recess 27. Then, as shown in FIG. 3, movement restriction between the cylinder tube 10 and the piston rod 20 is allowed. Therefore, it will be in the state where the damper function of shock absorber A is exhibited.
[0025]
According to said embodiment , the action | operation of the buffer mechanism A can be locked as needed. Therefore, if the mechanism of this embodiment is used for the shock absorber of the seismic isolation mechanism, the damper function of the shock absorber A is exhibited during an earthquake, while the operation of the shock absorber A is locked to shake the building in a strong wind. Can be regulated. That is, while maintaining the seismic isolation function, it is possible to prevent deterioration of habitability due to the influence of the wind.
Further, the shock absorber A may be normally locked, and the operation lock of the shock absorber A may be released when an earthquake is detected by an earthquake sensor or the like. That is, you may make it cancel the lock | rock of the shock absorber A as needed.
[0029]
Although the example applied to the shock absorber of a seismic isolation mechanism was demonstrated in the said embodiment, the mechanism of this invention can be used also for the damping damper which is restricted to the shock absorber of a seismic isolation mechanism. That is, the mechanism of the present invention can be applied to a shock absorber that needs to regulate the damper function as necessary.
[0030]
【The invention's effect】
According to this invention, the state in which a part of the ball is fitted in the recess is held by the regulating member, and the movement of the ball holding member and the regulating member with respect to the gripping member is regulated by the pressure action in the first and second pressure chambers. Since the relative movement between the cylinder tube and the piston rod can be restricted, the damper function of the shock absorber can be restricted as necessary. Therefore, if this invention is used for the shock absorber of the seismic isolation mechanism, the damper function of the shock absorber can be exhibited in the event of an earthquake, while the vibration of the building during strong winds can be restricted by locking the operation of the shock absorber. it can.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a first embodiment.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is an enlarged view of a main part of FIG. 1;
FIG. 4 is an explanatory diagram of a seismic isolation mechanism.

Claims (1)

The cylinder tube is divided into two chambers by a piston, and a shock absorber in which both chambers are communicated with each other via a damping valve, and one is fixed to the piston rod of the shock absorber, and the other is the outer periphery of the cylinder tube And a ball holding member and a regulating member provided between the gripping member and the cylinder tube so as to be movable with respect to the gripping member and the cylinder tube, and a ball holding member and the gripping member. Formed in the first pressure chamber formed, the second pressure chamber defined by the regulating member and the gripping member, the pressure supply means for supplying pressure oil to the first and second pressure chambers, and the ball holding member A ball incorporated in the through-hole, a spring interposed between the ball holding member and the regulating member, and a ball holding portion for the cylinder tube And a recess formed on the outer periphery of the cylinder tube, the state where a part of the ball is fitted in the recess is held by a regulating member, and the pressure in the first and second pressure chambers A shock absorber locking mechanism characterized in that the movement of the ball holding member and the regulating member relative to the gripping member is regulated by action to regulate the relative movement between the cylinder tube and the piston rod .

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