JPH01320341A - hydraulic shock absorber - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hydraulic shock absorber, and in particular a relatively large change has been made in the field of hydraulic shock absorbers.
Hydraulic pressure configured to exert buffering force only when applied!
! Regarding boxware.

Conventional technology For example, buildings such as buildings are constructed using a seismic isolation construction method in which a seismic isolation device is installed at the bottom of the building to protect the building and its interior from earthquakes. The seismic isolation construction method uses seismic isolation 5A installed between the ground and the building to alleviate vibrations from the ground.

For this type of seismic isolation device, for example, a plurality of disk-shaped metal plates coated with rubber on the surface and disk-shaped rubber plates are stacked alternately and held so that they do not separate from each other. Some laminated rubber members are installed between the ground and the building, and a hydraulic pressure unit is installed between the two.

Therefore, when the above-mentioned seismic isolation device is applied, the laminated rubber members increase the natural period of the building through shear deformation in response to ground vibrations when an earthquake occurs, and by removing the predominant period during an earthquake, the laminated rubber member reduces the earthquake input. In addition, the hydraulic shock absorber is intended to cope with the unexpected resonance yAl. A hydraulic VfJ device generally consists of a cylinder filled with hydraulic oil, a screw that moves one movement in the cylinder in response to an external force, and a resistance force that is generated by the hydraulic oil passing through as the piston moves. The passage is designed to buffer the acceleration caused by an earthquake by using a resistance force that corresponds to the displacement of the piston when an earthquake occurs.

Problems to be Solved by the Invention Conventional hydraulic relaxation devices are configured to generate a buffering force throughout the entire range of the piston stroke, that is, when the piston is displaced. Even in the case of an l1jl earthquake that includes a period, a resistance force is generated. However, in the case of earthquakes that include short-period earthquake cycles, if resistance is also generated from the hydraulic shock absorber, the natural period of the building can be made longer by using laminated rubber members, so that the natural period of the building is longer than the earthquake cycle. There was a problem in that the seismic isolation characteristics of the laminated rubber members, which are intended to reduce earthquake input, could not be fully demonstrated.

Therefore, the present invention provides a hydraulic shock absorber that solves the above problems, and does not act on short-period component earthquake motions, which are the characteristics of normal earthquake motions, because the displacement is small, but with long-period components, which are the characteristics of abnormal earthquake motions. Since the displacement is large for objects with periodic components, the 1llll JI buffer is configured to act on it.
The aim is to fire 11 shots.

Means and action for solving the problems Oil I'f according to the present invention! 1. The shock absorber includes a cylinder filled with hydraulic oil, and a piston that slides within the cylinder under the action of an external force and defines the inside of the cylinder into a first chamber and a second chamber. , a resistance force generating section that connects the first chamber and the second chamber and generates a resistance force through the hydraulic oil in the cylinder as the piston is displaced; The first chamber and the second chamber are connected to each other when the displacement amount of the piston is equal to or less than a predetermined length from the reference position, and the opening is blocked by the piston when the piston is displaced by a predetermined distance or more, forming a communication path, In a region where the amount of displacement of the piston is relatively small, no resistance force is generated and an invalid stroke is made, and a resistance force is generated only in a region where the amount of displacement of the piston is relatively large.

Embodiment FIGS. 1 and 3 show an embodiment of the hydraulic loosening WJ device according to the present invention.

Figure 1 is a schematic diagram of a building constructed using the seismic isolation construction method. As shown in FIG. 1, the building 1 is, for example, a 5.degree. six-story building, and a seismic isolation device 3 is provided between the bottom of the building 1 and the ground ff1i2. The ground 2 and the seismic isolation device 3 are installed underground 5 dug into the ground 4.

This seismic isolation device 3 includes a plurality of laminated rubber members 6 that support the building 1 and a plurality of hydraulic dampers that buffer horizontal vibrations.
It consists of i unit 7. As mentioned above, the laminated rubber member 6 has a structure in which a plurality of metal plates whose surfaces are coated with rubber and a disc-shaped rubber plate are stacked one on top of the other and held together. By using shear deformation to make the building's natural period long enough to separate it from the predominant period of earth erosion, the earthquake input is reduced. In addition, although only three laminated rubber shrines 6 are visible in Figure 1, the number of shrines 6 for laminated rubber parts are installed according to the floor area and number of floors of the building 1, and the size of the building 1 per stone. The members 6 are installed at predetermined intervals so that roughly equal loads are applied to them.

Also, although only two hydraulic shock absorbers 7 are visible in Figure 1, there are actually two or more installed, and they are installed in different directions so that they can respond to vibrations in any direction. .

Here, with reference to FIGS. 2 and 3, the Ura Jl.
The buffer '5 will be explained in detail.

hydraulic! ! ! Ifi device 7 is ll! The shock absorber heavy equipment main body 8 consists of a piston member 9 that slides within the shock absorber main body B. or,
*The W77Jz wood rest 8 consists of a circular tree-shaped 8 cylinder 10, a cover member 11 attached to one end of the cylinder 10, and a base shell 12 attached to the other end of the cylinder 10. The lid member 11 and the base shell 12 are integrally fixed to the plunger portions 10a and 10b of the cylinder 100 by tightening the mounting bolts 13, and form a cylinder chamber 10c inside the cylinder 10. It is full of hydraulic oil.

Further, as shown in FIG. 3, an orifice groove 14 serving as a resistance force generating section is provided on the inner wall of the cylinder 10 so as to extend in the sliding direction of the piston member 9. The orifice groove 14 is such that the piston 9a of the piston member 9 is connected to the cylinder chamber 10.
When the piston 9a is at the center 7 (this position is the reference position in this embodiment) of the piston 9a, the left and right end surfaces 9a+,
The portions with lengths [8 and 1] are better formed than 9a2. The back length rS+ of the length "S" formed at a position away from the piston 9a, the J part has the same flow path area as the A part facing the piston 9a, and the orifice l
? Both ends of i14, that is, the length “S2” portion are the piston 9
There are 8 parts that are inclined so that the flow path area is gradually narrowed in accordance with the sliding direction of a.

Further, the cylinder '10 has an end surface 9a+ of the piston 9a.
, cylinder chamber 1 at a predetermined length rs + J from 9az.
Boat 10d+ opening in 0c.

10d2 is bored and the boat 10 (jg
, 10 da are drilled.

Note that the "predetermined length ISl" is a dimension determined by the size of the building 1, for example, 5r! For lJ buildings 8
The culm degree of one plant is 18.811Il.

In addition, the boats 10d1 and 10d3 are connected to each other by a pipe 15 provided as a communication path on the outside of the cylinder 10 so as to bypass the screw 10d1 and the boat 10d2.
and 10d4 are similarly connected through a pipe 16 provided as a communication path so as to bypass the piston 9a. A check valve 17 is provided in the piping 15 to allow flow only from the h chamber 10c1 defined in the piston 9a to the right chamber 10C2. In addition, the right ventricle 10C2 is connected to the pipe 16.
A check valve 18 is provided that allows flow only from the left ventricle 10C1 to the left ventricle 10C1.

The piston member 9 includes a piston 9a that is slidably fitted into the cylinder chamber 10c, and both end surfaces 9a+ of a screw 1-9a.
, rods 9b and 9c extending in the sliding direction from 9a2, a mounting hole 9d installed at the end of the rod 9b, and a mounting collar 9e provided in the middle of the rod 9b. . The attachment hole 9d of the rod 9b is connected to the bottom of the building 1.

Further, the O-rads 9b and 9G are respectively inserted into the guide holes 11 of the lid member 11.
It extends through the guide hole 12a of the a1 base shell 12, thereby regulating the sliding direction.

19 is an O-ring, which connects the rods 9b, 9G and the guide hole 11a.
, 12a are sealed liquid-tightly. 20 is an O-ring that seals between the inner wall of the cylinder 10, the lid member 11, and the base shell 12.

The base shell 12 has an oil reservoir chamber 12b formed therein, and a passage 21, 22 that communicates between the cylinder '110G and the oil reservoir chamber 12b has a diameter 23 and an oil reservoir chamber 12b.
Is there a check that only allows flow from b to cylinder chamber 10G? 24 is marked It.

Note that the oil reservoir v12b is not filled with hydraulic oil, but is filled so that a space 25 remains. Furthermore, a mounting portion 1 having a mounting hole 12C is provided at the end of the base shell 12.
2d protrudes, and the mounting portion 12d is connected to the ground 2.

Since the piston 9a has rods 9b and 9c extending from both end surfaces 9a+ and 9a2, the volume inside the cylinder chamber 10c does not change even if the piston 9a slides (G).

Therefore, the hydraulic oil passing through the orifice groove 14 flows in proportion to the displacement of the piston 9a.
4, a resistance force proportional to the displacement R of the piston 9a is generated.

Further, the hydraulic oil in the oil reservoir chamber 12b is provided to compensate for temperature changes. That is, when the hydraulic oil in the cylinder 'I10C expands due to the rise of ff1U, the excess hydraulic oil flows through the passage 21 and the throttle. 23 into the ura reservoir chamber 12b. Also, if the hydraulic oil contracts due to a drop in temperature,
Accordingly, the hydraulic oil in the oil reservoir chamber 12b flows through the passage 22 and the check valve 24.
The cylinder chamber 10C is replenished through the cylinder chamber 10C.

Next, the hydraulic shock absorber 7 and the laminated rubber member 6 configured as described above will be described.
The operation will be explained.

It is said that a relatively small earthquake occurred here.

A relatively small vibrational displacement acts on the ground 4 and the ground 2. In this case, when acceleration in the direction of arrow x1 is transmitted to the ground 11t2, the building 1 is relatively displaced in the direction of arrow x2 due to the action of the laminated rubber member 6. Since the plates and rubber plates are stacked alternately, each metal plate and rubber root will move elastically little by little in the two directions of the arrows.

In this way, when the amount of displacement is relatively small, the laminated rubber member 6 is elastically deformed as described above, and the hydraulic shock absorber 7 is
The piston member 9 is slidably displaced in the x2 direction of the arrow. At this time, the displacement n1 of the screw 9a is a predetermined length rs from the medium heat position (solid line indicates 71) as the reference position as shown in FIG.
+ J (indicated by the two-dot chain line 1 in Figure 3) or less.

When the piston 98 slides in the cylinder chamber 10c as described above, the pressure in the right chamber 10C2 increases, and the pressure in the right chamber 10C2 increases.
The hydraulic oil inside passes through the orifice 14 and enters the left ventricle 10G+
flow inside. In addition, a part of the hydraulic oil in the right chamber 10C2 is transferred to the boat 10d2, the piping 16, the check valve 18, and the boat 10d4.
It flows into the left ventricle 10C1 via.

Therefore, no 1° drag force is generated in the orifice 14, and the displacement of the piston 9a becomes an invalid stroke. In this way, as shown in FIG. 4, in the hydraulic shock absorber 7, a stroke of 81 or less acts as a dead zone against the action of external force, so the displacement of the building 1 is caused by the elasticity of the laminated rubber member 6. Therefore, when a relatively small displacement is applied to the seismic isolation device 3, the resistance force by the oil FF shock absorber 7 hardly acts, and the laminated rubber member 6
It is flexibly absorbed due to its elasticity.

Further, even when the fixture 1 undergoes a relatively small displacement in the direction of arrow x1, the laminated rubber member 6 and the hydraulic shock absorber 7 perform the same operation in the opposite direction as described above. That is, when the building 1 vibrates, the gI layer rubber member 6 makes the natural period of the building longer by its shear deformation, which is much different from the natural period of the earthquake, thereby reducing the earthquake input.

Next, if an earthquake with a relatively short frequency component occurs, a relatively large displacement will act between the ground 4 and the ground 2 and the building 1 due to a resonance phenomenon.

For example, when a displacement in the direction of arrow
When the impactor 7 is operated, it is relatively displaced in the two directions of the arrows.

In this case, the laminated rubber member 6 undergoes large elastic deformation and is buffered by the resistance force of the hydraulic shock absorber 7. In the hydraulic shock absorber 7, the piston 9a slides in the cylinder chamber 10c in the direction of the arrow x2. When doing so, as described above, no resistance force is generated in a stroke of 81 or more from the center position (indicated by a solid line in FIG. 3). However, when the piston 9a passes the stroke S1, the boat 10d2 opening into the cylinder chamber 10C is blocked by the piston 9a, and when the stroke of the piston 9a exceeds S1, the hydraulic oil in the stone chamber 10c2 reaches the orifice full.
4 and flows into the left ventricle 10C1. Therefore, as the hydraulic oil passes through the orifice 14, a resistance force is generated, causing the piston 9a to vibrate.

Region 1 until the end surface 9a2 of the piston 9a exceeds the stroke S+ and reaches the stroke S! l! In S2, as the piston 9a is displaced in the direction of the arrow X2, the orifice 14 is narrowed by the inclined part 8.
As a result, as shown in FIG.
It increases with the displacement of a. Therefore, hydraulics! ! V7J device 7
After passing the invalid stroke S1, the displacement of the building 1 is effectively buffered by the low drag force generated in the region of the stroke S2. 1. Also, when vibrations in the directions of the arrows x 2 are applied to the ground 2, the operation in the direction opposite to that described in 1 is performed in the same way, and due to the displacement G of the building 1, the action of the L laminated rubber member 6 and the hydraulic shock absorber 70, Buffered.

Therefore, the seismic isolation device 3 does not work in the event of an earthquake with a relatively short period, but when an earthquake with a long period occurs, the seismic isolation device 3 is laminated according to the amount of displacement of the building 1. Rubber member 6
, hydraulic pressure M''/!i7 can be simultaneously applied to prevent the ``ξ vibration↑'' caused by the long-period component of seismic waves.

In the above explanation, the left ventricle 10G+ is located outside the cylinder 10.
Although piping 15° 16 is provided to communicate between the cylinder chamber 10c and the stone chamber 10C2, the present invention is not limited to this, but it is possible to form a pipe iM shorter than the orifice 14 on the inner wall of the cylinder chamber 10c, that is, a pipe whose both ends are at the stroke S1 Also good.

Further, in the above embodiment, the orifice groove 14 as a resistance force generating part is provided in the inner wall of the cylinder chamber 10G, but as a resistance force generating part, for example, a through hole is provided in the piston 9a to communicate the left chamber 10G+ and the stone chamber 10C2. A tapered pin is fitted into this through hole to increase the flow path area of the through hole.
It may be adjusted according to the displacement position of a.

In the above embodiment, the hydraulic pressure tILI applied to the seismic isolation device
Although the hydraulic shock absorber of the present invention has been described as a type II device, the hydraulic shock absorber of the present invention is not limited to this, and can be applied to devices other than seismic isolation devices.

Effects of the Invention As described above, in the hydraulic shock absorber according to the present invention, when the displacement amount of screws 1 to 1 is small, such as a predetermined length or less, the hydraulic oil in the cylinder passes not only through the resistance force generating part but also through the communication passage. Since the motor moves with a resistance force, the stroke during this period can be used as an invalid stroke, that is, a dead zone, and
When the piston is displaced by a predetermined length or more, the communication path is blocked by the piston, and the hydraulic oil in the cylinder passes only through the resistance force generating section, generating a low resistance force and buffering external force. Therefore, for example, in a seismic isolation device applied to a building using the seismic isolation construction method, the change in the piston (one of the pistons) inhibits the isolation ability of the laminated rubber member against an earthquake with a predominant period of short period less than a predetermined length. In addition, for earthquakes with a long predominant period in which the displacement of the piston exceeds a predetermined length, in combination with laminated rubber members, it is possible to effectively reduce the vibrations caused by the earthquake. It has characteristics.

[Brief explanation of the drawing]

Does Figure 1 constitute the invention? 1llff loose! ! Fig. 2 is a longitudinal cross-sectional view of an embodiment of the hydraulic shock absorber according to the present invention;
The drawing is an enlarged vertical cross-sectional view of the main part of the present invention, and FIG. 4 is a diagram showing the relationship between the piston stroke and low drag. 1...Silicon material, 2...Ground, 3...Seismic isolation device, 6.
... Laminated rubber member, 7... Hydraulic pressure is loose! III device, 9...
- Piston member, 10... Cylinder, 11... Lid, 12... Pace shell, 14... Orifice groove,
15.16...Piping, 17.18...Check valve. Patent applicant Tokiko Co., Ltd. Agent Patent attorney Tadahiko Ito
(Ken) (Patent attorney Kaneyuki Matsuura 11,
X5' -ba1s1@Figure 2

Claims (1)

[Claims] a cylinder filled with hydraulic oil; a piston configured to slide within the cylinder under the action of an external force and define the inside of the cylinder into a first chamber and a second chamber; and the first chamber. and a second chamber, through which hydraulic oil in the cylinder passes as the piston is displaced, and generates a resistance force; The first chamber and the second chamber are connected to each other when the amount of displacement is equal to or less than a predetermined length from a reference position, and the opening is blocked by the piston when the piston is displaced by a predetermined length or more. A hydraulic shock absorber characterized by: