JP5182668B2 - Hydraulic buffer - Google Patents

Description

  The present invention relates to a hydraulic shock absorber.

A hydraulic shock absorber (hydraulic shock absorber) used in a seismic isolation system such as a building is disclosed in Patent Document 1, for example. This type of hydraulic shock absorber requires a plurality of acceleration sensors that detect vibration and a plurality of electromagnetic valves that switch the damping force in stages based on the detection results of the acceleration sensors, which increases costs. Regular maintenance is required.
JP 2006-283839 A

  Therefore, an object of the present invention is to provide a hydraulic shock absorber capable of reducing cost and facilitating maintenance.

  In order to solve the above problems, a hydraulic shock absorber according to the present invention includes a cylinder filled with hydraulic fluid, a piston that is inserted into the cylinder and divides the cylinder into two pressure chambers, A piston rod connected to the piston; a rod guide provided at an end of the cylinder for guiding the piston rod in the axial direction; an auxiliary tank filled with the hydraulic fluid; the auxiliary tank; and the pressure chamber; A fluid passage for flowing the hydraulic fluid between, a damping force generating means for generating a damping force in the hydraulic fluid flowing through the fluid passage, a damping force switching means for switching the damping force of the damping force generating means, The damping force switching means includes a damping force switching valve that is switched between a low side and a high side by the opening and closing of the valve, and an external operation. Said decrease An external switch that opens and closes the force switching valve, a weight provided outside the cylinder, a slide mechanism that can move in the axial direction in conjunction with the expansion and contraction of the piston rod, and one end connected to the weight and the other end A connecting member connected to the operation portion of the external switch, and when the moving distance of the slide mechanism becomes a specified value or more, the weight is dropped by the slide mechanism, and thereby the connecting member The damping force of the damping force generating means is switched by opening and closing the damping force switching valve by operating the operation part of the external switch via the switch.

  According to the present invention, it is possible to provide a hydraulic shock absorber capable of reducing cost and facilitating maintenance.

An embodiment of the present invention will be described with reference to FIGS. Here, the hydraulic shock absorber 1 (hydraulic shock absorber) used for the building seismic isolation system will be described.
As shown in FIG. 1, the hydraulic shock absorber 1 has a mounting eye 5 provided at the proximal end portion of the outer case 2 and a mounting eye 6 provided at the distal end portion of the piston rod 3. The hydraulic shock absorber 1 is connected to a joint 7 whose mounting eye 5 is fixed to one of the building or the foundation, and to which a mounting eye 6 is fixed to the other of the building or the foundation. Thereby, the hydraulic shock absorber 1 is attached between the building and the foundation.

  As shown in FIGS. 1 and 7, the hydraulic shock absorber 1 has a cylinder 26 filled with hydraulic oil 25 (hydraulic fluid), and a piston 27 slidably fitted in the cylinder 26. The base end of the piston rod 3 is fixed to the piston 27. Further, the hydraulic shock absorber 1 includes hydraulic oil 25 between the auxiliary tank 8 filled with the hydraulic oil 25 and one of the two pressure chambers 28 a and 28 b in the cylinder divided by the piston 27 and the auxiliary tank 8. A liquid passage 29 through which the fluid flows, a check valve 30 that is provided in the piston 27 and allows only the flow of the hydraulic oil 25 from the pressure chamber 28b to the pressure chamber 28a, and a liquid passage 29 provided on the rear end side of the outer case 2. Two or more suction valves 31 that allow only the flow of the hydraulic oil 25 to the pressure chamber 28b, and two or more that generate a damping force in the hydraulic oil 25 that is provided on the distal end side of the outer case 2 and flows through the liquid passage 29. And a damping valve 32 (damping force generating means). The liquid passage 29 has a shutoff valve 9 (attenuating force switching valve) and a damping valve 32B (attenuating force generating means) B having no shutoff valve 9 (to be described later) and having only the attenuating valve 32A. There are two systems.

  The hydraulic shock absorber 1 has a damping force switching device (damping force switching means) that switches from a setting with a low damping force to a setting with a high damping force. As shown in FIG. 3A and FIG. 4, the damping force switching device is provided on the distal end side of the outer case 2 and is slightly more than the center of the outer case 2 in the height direction (vertical direction in FIG. 4). A shut-off valve 9 disposed on the upper side, an external switch 10 provided integrally with the shut-off valve 9, a weight 11 formed in a columnar shape, and one end fixed to the center of the upper end surface of the weight 11 It has a wire 13 (connection member) whose end is fixed to the operation lever 12 (operation unit) of the external switch 10. The wire 13 is guided in an L shape by a pipe-shaped wire guide 14 provided on the outer surface of the auxiliary tank 8. In addition, as shown in FIG. 4, the operation lever 12 is provided in a state of being tilted counterclockwise when viewed from the front.

  As shown in FIG. 3B, in a state where the external switch 10 is not driven and the shutoff valve 9 is opened, B in which the shutoff valve 9 is provided in addition to the A series liquid passage 29 of only the damping valve 32A. The damping valve 32B of the series liquid passage 29 acts, and the damping force of the hydraulic shock absorber 1 is set to the low side. On the other hand, when the external switch 10 is driven and the shut-off valve 9 is closed, only the damping valve 32A of the liquid passage 29 of the A system acts, and the damping force of the hydraulic shock absorber 1 is set to the higher side. . The damping force switching device is provided outside the outer case 2 and is movable in the axial direction of the piston rod 3 (left and right direction in FIG. 1, hereinafter simply referred to as the axial direction), and the slide member 15. And a slide mechanism that moves the piston rod 3 in conjunction with the expansion and contraction of the piston rod 3.

  The slide mechanism includes a base plate 16 provided on the outer surface of the outer case 2 and arranged vertically, and a guide rail 17 (slide guide) provided on the outer surface of the base plate 16 for guiding the slide member 15 in the axial direction. And a link bar 19 (link member) having one end connected to the bracket 18 provided at the base of the mounting eye 6 on the piston rod 3 side and the other end connected to the base of the slide member 15. As shown in FIG. 2, the slide member 15 includes a pair of operation pieces 20 and 21 that are provided at the base and configured to open outwardly in a V shape in plan view. The base plate 16 is provided with a support base 22 that supports the weight 11. On the upper surface of the support base 22, there is provided a groove 23 having a width sufficient to fit the lower end portion of the weight 11 and extending perpendicularly to the axial direction to guide the weight 11 outward. In addition, a notch 24 is formed at the bottom of the groove 23 to guide the side surface of the weight 11 falling from the support base 22 and accommodate (hold) the weight 11 after dropping.

  Next, the operation of this embodiment will be described. 1 and 4 show a state immediately after the hydraulic shock absorber 1 (hydraulic shock absorber) is attached between the building and the foundation, that is, a state before the weight 11 falls. In this state, in the hydraulic shock absorber 1, the external switch 10 is not driven and the shut-off valve 9 is opened, and the damping that the B system damping valve 32 </ b> B acts in addition to the damping valve 32 </ b> A of the A system liquid passage 29. As shown in FIG. 2, the weight 11 has a lower end fitted into the groove 23 of the support base 22 and stands substantially vertically, and further, a pair of operation pieces 20 of the slide member 15. , 21.

  When a building shake (external force) due to an earthquake or the like is input to the hydraulic shock absorber 1, the hydraulic shock absorber 1 acts to extend and contract the piston rod 3 to attenuate the building shake. In this embodiment, the slide member 15 moves in the axial direction (same as the expansion / contraction direction of the piston rod 3) in conjunction (synchronization) with the expansion / contraction of the piston rod 3 by the slide mechanism including the link bar 19 (link member). When the expansion / contraction width of the piston rod 3, and thus the movement distance of the slide member 15, exceeds a specified value, the weight 11 falls from the support base 22 by the operation of the pair of operation pieces 20, 21 of the slide member 15.

  More specifically, for example, when the extension amount of the piston rod 3 is larger than a specified value (specified distance), the slide member 15 moves to the left in FIG. 2, and the weight 11 is moved by the inclined portion 20 a of the operation piece 20. Is pressed. As a result, as shown in FIG. 5, the weight 11 is guided outward (downward in FIG. 2) with the lower end portion guided, and finally falls from the support base 22. Here, since the weight 11 falls while the side surface is guided by the notch 24 of the support base 22, it is possible to suppress the swirling at the time of dropping. Furthermore, as shown in FIG. 6, the weight 11 is housed (held) in the cutout portion 24 of the support base 22, so that it is possible to prevent swinging after dropping.

On the other hand, as the weight 11 is dropped, the wire 13 (connection member) moves in the wire guide 14 and the operation lever 12 (operation unit) is operated (the state where the operation lever 12 is operated is shown in FIG. 3). (See a) virtual line). When the external switch 10 is driven by the operation of the operation lever 12, the shutoff valve 9 is closed. Thereby, only the damping valve 32A provided in the liquid passage 29 of the A system acts, and the damping force of the hydraulic shock absorber 1 is switched from the low side setting to the high side setting. In addition, at the time of maintenance, by confirming that the weight 11 is housed (held) in the notch 24 of the support base 22, it is switched to the setting on the higher damping force side of the hydraulic shock absorber 1. I can know. In this case, by returning the weight 11 onto the support base 22, the operation lever 12 and the external switch 10 are returned to their original positions, and the shut-off valve 9 is opened, so that the damping force of the hydraulic shock absorber 1 can be reduced. You can switch to this setting.
In the present embodiment, the piston rod is provided on one end side of the piston rod, and the single rod type hydraulic shock absorber in which the rod protrudes from one side of the cylinder has been described. It can also be applied to a hydraulic shock absorber.
In this embodiment, it is possible to provide a plurality of damping valves 32A and damping valves 32B, and a configuration having a plurality of B systems by providing a plurality of shut-off valves 9 in accordance with the number of damping valves 32B. Absent. Further, a plurality of prescribed stroke amount values can be set, and the weight 11 and the shut-off valve 9 may be added in accordance with the number to switch the multistage damping force.

According to the present embodiment, when the slide member 15 moves in conjunction with the expansion and contraction of the piston rod 3 and the moving distance of the slide member 15 exceeds a specified value (specified distance), the slide member 15 is operated. The weight 11 falls, and the external switch 10 is operated via the wire 13 (connection member). Thereby, the shut-off valve 9 (damping force switching valve) is closed, and the setting of the damping side of the hydraulic shock absorber 1 (hydraulic pressure buffer) is switched from the low setting to the high setting. Therefore, the hydraulic shock absorber 1 can be configured without using components that require power supply such as an electromagnetic valve and an acceleration sensor. Thereby, the manufacturing cost of the hydraulic shock absorber 1 used for a seismic isolation system can be reduced significantly. In addition, since parts that require power supply are not used, it is easier to install than conventional hydraulic shock absorbers, and the maintenance interval can be greatly extended, reducing running costs. can do.
Further, the weight 11 falls from the support base 22 while being guided by the notch 24, and is further accommodated (held) in the notch 24 after being dropped. Can be prevented from being hurt or generating a hitting sound. During maintenance, by confirming that the weight 11 is housed (held) in the notch 24 of the support base 22, the setting of the damping force of the hydraulic shock absorber 1 is switched from the low setting to the high setting. You can know what was done.

It is a right view of the hydraulic shock absorber of this embodiment. It is a figure for demonstrating a mechanism, and is a figure which shows the piston rod side among the top views of the hydraulic shock absorber of this embodiment. (A) It is a figure which shows the shut-off valve with which the external switch in the hydraulic shock absorber of this embodiment was integrated. (B) It is a figure which shows typically the operation | movement of a shut-off valve, and the switching state of a liquid passage. It is a front view of the hydraulic shock absorber of this embodiment. In FIG. 2, it is a figure which shows the state which a weight guides to a groove | channel and moves outside. It is a front view of the hydraulic shock absorber of this embodiment, and is a figure showing the state where the weight fell especially. It is a cross-sectional schematic diagram of the hydraulic shock absorber shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic buffer (hydraulic buffer), 3 piston rod, 8 auxiliary tank, 9 shutoff valve (damping force switching valve), 10 external switch, 11 weight, 12 operation lever (operation part), 13 wire (connection member) 15) Slide member

Claims (3)

A cylinder filled with hydraulic fluid, a piston that is inserted into the cylinder and divides the cylinder into two pressure chambers, a piston rod connected to the piston, and an end of the cylinder. A rod guide for guiding the piston rod in the axial direction, an auxiliary tank filled with the hydraulic fluid, a liquid passage for flowing the hydraulic fluid between the auxiliary tank and the pressure chamber, and a flow through the liquid passage A hydraulic shock absorber comprising: damping force generating means for generating a damping force in the hydraulic fluid; and damping force switching means for switching the damping force of the damping force generating means,
The damping force switching means includes a damping force switching valve that is switched between a low damping force and a high damping force of the damping force generating means by opening and closing the valve, and an external switch that opens and closes the damping force switching valve by an external operation. A weight provided outside the cylinder, a slide mechanism movable in the axial direction in conjunction with expansion and contraction of the piston rod, one end connected to the weight and the other connected to the operation portion of the external switch A connecting member,
When the moving distance of the slide mechanism becomes a specified value or more, the weight is dropped by the slide mechanism, whereby the operation part of the external switch is operated via the connecting member, and the damping force switching is performed. The hydraulic shock absorber, wherein the damping force of the damping force generating means is switched by opening and closing the valve. The slide mechanism includes a slide member movable in the axial direction of the piston rod, a slide guide provided outside the cylinder for guiding the slide member in the axial direction, and one end connected to the piston rod side. The hydraulic shock absorber according to claim 1, further comprising a link member having an end connected to the slide member. The slide member has a pair of operation pieces provided to open outward in a plan view in a V shape, and the weight is supported by a support base provided outside the cylinder, A groove that is disposed between the pair of operation pieces of the slide member and that extends vertically and horizontally with respect to the moving direction of the slide member and has a notch at the end is formed on the support base. Formed in the groove, the lower end of the weight is accommodated movably along the groove,
As the slide member moves, the weight abuts on at least one of the operation pieces of the slide member and moves outwardly guided by the groove, and the moving distance of the slide member becomes a specified value or more. 3. The hydraulic shock absorber according to claim 1, wherein the weight is held by the notch after the weight falls from the support base. 4.

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