JP2022177095A - Hydraulic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To disclose one example of a hydraulic device capable of suppressing occurrence of a returning operation failure.

SOLUTION: A pilot chamber 35 and an intermediate chamber 33 communicate with each other via a pilot flow passage 35A. Thus, a part of hydraulic oil flowing into the intermediate chamber 33 flows through the pilot flow passage 35A into the pilot chamber 35 during basic operation. At such the time, a first valve part 5A is displaced to a right side of paper, thereby reducing a first opening area. Quantity of the hydraulic oil to be supplied from the intermediate chamber 33 to the pilot chamber 35 is decreased as a pressure difference between the intermediate chamber 33 and the pilot chamber 35 becomes smaller. During the basic operation, a pressure (static pressure) in the intermediate chamber 33 is reduced as the first opening area becomes smaller. Thus, the first valve part 5A is made hard to be displaced, thereby suppressing occurrence of a returning operation failure.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present disclosure relates to a hydraulic device applied to a hydraulic damper of a device that suppresses shaking of buildings during an earthquake. The device that suppresses the shaking of the building is, for example, a vibration control device, a seismic isolation device, or the like.

The hydraulic damper divides a hydraulic chamber within a cylinder into a first hydraulic chamber and a second hydraulic chamber, and has a piston that reciprocates within the cylinder. For example, the hydraulic device described in Patent Document 1 has two valve parts for the purpose of improving nonlinearity in the low-speed range of the vibrating body and exhibiting sufficient damping performance in the high-speed range of the vibrating body. are interlocked and displaced.

That is, the first valve portion according to the document adjusts the opening area on the inlet side (hereinafter referred to as the first opening area). The second valve portion adjusts the opening area on the outflow port side (hereinafter referred to as the second opening area).

When the pressure difference between the pressure on the inflow port side and the pressure on the outflow port side is small, the hydraulic device generates a damping force mainly in the second valve portion, and when the pressure difference increases, the damping force is generated mainly in the first valve portion. A damping force is generated at the valve.

Specifically, the hydraulic device is capable of "basic operation" and "return operation". The basic operation is an operation of decreasing the first opening area while increasing the second opening area as the pressure difference increases. The return operation is an operation of increasing the first opening area while decreasing the second opening area as the pressure difference becomes smaller.

JP 2017-166623 A

In the invention described in Patent Document 1, the basic operation is realized by using the pressure on the inlet side, and the return operation is realized by using the elastic force of the spring and the pressure on the outlet side. Therefore, if the pressure difference becomes excessively large, there is a risk that the hydraulic system will not perform the return operation.

That is, when a large dynamic pressure acts on the inlet side, the pressure difference becomes excessively large and the first opening is closed. When the first opening is closed, even if the dynamic pressure disappears, the dynamic pressure is maintained as a static pressure and a high pressure is maintained. Therefore, when a large dynamic pressure acts on the inflow port side, there occurs a problem that the hydraulic system does not return (hereinafter referred to as a return operation problem).

In view of the above points, the present disclosure discloses an example of a hydraulic device capable of suppressing the occurrence of return operation failure.

A hydraulic device applied to a hydraulic damper preferably has at least one of the following constituent requirements, for example.
That is, the constituent requirements are
A housing (3) provided with an inflow port (3A) for inflow of hydraulic oil, an outflow port (3B) for outflow of hydraulic oil, and a storage hole (3C) communicating with the inflow port (3A) and the outflow port (3B). When,
A first valve portion (5A) displaceably housed in the housing hole (3C) for adjusting the opening area of the first opening (31) communicating with the inlet (3A). (5A) and
A second valve part (5B) displaceably housed in the housing hole, the second valve part (5B) for adjusting the opening area of the second opening (32) communicating with the outflow port (3B). )When,
A shaft part that connects the first valve part (5A) and the second valve part (5B) and has a cross-sectional area smaller than the cross-sectional area of the first valve part (5A) and the cross-sectional area of the second valve part (5B) (5C) and
An elastic force that displaces the first valve portion (5A) and the second valve portion (5B) in a direction in which the opening area of the first opening (31) increases and the opening area of the second opening (32) decreases. an expelable spring (7),
When the space in the storage hole (3C) in which the shaft (5C) is located is defined as an intermediate chamber (33), the inlet (3A) communicates with the intermediate chamber (33) through the first opening (31). possible, the intermediate chamber (33) can communicate with the outlet (3B) through the second opening (32),
Further, the pilot chamber (35) capable of applying pressure to the first valve portion (5A) in a direction to reduce the opening area of the first opening (31) and increase the opening area of the second opening (32). There is provided a pilot chamber (35) that always communicates only with the intermediate chamber (33) via the pilot flow path (35A).

As a result, in the hydraulic system, hydraulic oil is supplied from the intermediate chamber (33) to the pilot chamber (35) through the pilot flow path (35A) during basic operation. Therefore, since the volume of the pilot chamber (35) increases, the opening area of the first opening (31) decreases while the first valve portion (5A) resists the elastic force of the spring (7). displaced in the direction

The amount of hydraulic oil supplied to the pilot chamber (35) (hereinafter referred to as "supplied oil amount") decreases as the pressure difference between the intermediate chamber (33) and the pilot chamber (35) decreases. During basic operation, the pressure (static pressure) in the intermediate chamber (33) decreases as the opening area (hereinafter referred to as first opening area) of the first opening (31) decreases.

Therefore, as the first opening area becomes smaller, the amount of oil to be supplied is reduced, making it difficult for the first valve portion (5A) to displace. In addition, the hydraulic system prevents the first opening (31) from being completely closed.

The pilot chamber (35) communicates with the outflow port (3B) side through the pilot flow path (35A), the intermediate chamber (33) and the second opening (32). Even if the valve is in a fully closed state, the pressure in the pilot chamber (35) will decrease. As a result, the hydraulic device is quickly restored by the elastic force of the spring (7).

Incidentally, the symbols in the parentheses above are examples showing the correspondence with specific configurations and the like described in the embodiments described later, and the present disclosure is limited to the specific configurations and the like indicated by the symbols in the parentheses. not something.

1 is a conceptual diagram of a hydraulic system according to a first embodiment; FIG. It is a conceptual diagram of the hydraulic system which concerns on 2nd Embodiment. It is a figure showing the 1st diaphragm member and the 2nd diaphragm member concerning a 2nd embodiment. It is a conceptual diagram of the hydraulic system which concerns on 3rd Embodiment.

The following "embodiment of the invention" shows an example of an embodiment belonging to the technical scope of the present disclosure. In other words, the matters specifying the invention described in the claims are not limited to the specific configurations, structures, etc. shown in the following embodiments.

It should be noted that arrows and oblique lines indicating directions in each drawing are provided to facilitate understanding of the relationship between the drawings and the shape of each member or portion. Therefore, the inventions shown in this disclosure are not limited to the directions shown in each figure. The hatched figures are not cross-sectional views.

At least one member or portion described with at least a reference numeral is provided unless otherwise specified as "one" or the like. In other words, two or more members may be provided unless there is a notice such as "one". The invention shown in the present disclosure includes at least components such as members or parts that are labeled and described.

(First embodiment)
The present embodiment applies an example of the hydraulic device according to the present disclosure to a hydraulic device applied to a hydraulic damper of a device that suppresses shaking of a building during an earthquake. The device that suppresses the shaking of the building is, for example, a vibration control device, a seismic isolation device, or the like.

The hydraulic system is applied to a hydraulic damper for a vibration control system or a seismic isolation system. In addition, the hydraulic damper applied to the hydraulic system 1 according to the present embodiment has the same configuration as the hydraulic damper described in Patent Literature 1, for example.

1. Configuration of Hydraulic Device A hydraulic device 1 includes at least a housing 3, a valve body 5, a spring 7, and the like, as shown in FIG. The housing 3 is provided with an inflow port 3A, an outflow port 3B, a storage hole 3C, and the like.

The inflow port 3A is an opening through which the hydraulic fluid flowing out from the hydraulic damper flows. The outflow port 3B is an opening through which hydraulic oil that has flowed into the housing 3 flows out. The accommodation hole 3C is a hole-shaped space that communicates with the inflow port 3A and the outflow port 3B and accommodates the valve body 5 so as to be displaceable.

The valve body 5 includes at least a first valve portion 5A, a second valve portion 5B, a shaft portion 5C, and the like. The first valve portion 5A is a valve portion for adjusting the opening area (hereinafter referred to as the first opening area) of the first opening 31 communicating with the inlet 3A.

The second valve portion 5B is a valve portion for adjusting the opening area (hereinafter referred to as the second opening area) of the second opening 32 communicating with the outflow port 3B. The shaft portion 5C is a connection portion that connects the first valve portion 5A and the second valve portion 5B and has a cross-sectional area smaller than that of the first valve portion 5A and the cross-sectional area of the second valve portion 5B.

The valve body 5 according to this embodiment is displaced across openings such as the inflow port 3A and the outflow port 3B. Therefore, the valve body 5, that is, the first valve portion 5A and the second valve portion 5B are slidably displaced while being in sliding contact with the inner wall of the housing hole 3C.

In the present embodiment, the cross-sectional area of the first valve portion 5A and the cross-sectional area of the second valve portion 5B are equal, and the valve body 5 includes the first valve portion 5A, the second valve portion 5B and the shaft portion 5C. is an integrally molded product.

Hereinafter, the space in which the shaft portion 5C is positioned within the storage hole 3C is referred to as an intermediate chamber 33. As shown in FIG. That is, the inflow port 3A can communicate with the intermediate chamber 33 through the first opening 31, and the intermediate chamber 33 can communicate with the outflow port 3B through the second opening 32.

The spring 7 exerts an elastic force that displaces the valve body 5 in a direction in which the first opening area increases and the second opening area decreases. The spring 7 is arranged in a space (hereinafter referred to as back pressure chamber 34) on the opposite side of the intermediate chamber 33 across the second valve portion 5B in the housing hole 3C.

The back pressure chamber 34 always communicates with the outflow port 3B side through the drain passage 34A. Therefore, when the volume of the back pressure chamber 34 changes, the hydraulic oil flows between the back pressure chamber 34 and the outflow port 3B through the drain passage 34A.

A pilot chamber 35 is provided on the side opposite to the intermediate chamber 33 across the first valve portion 5A. The pilot chamber 35 is a pressure chamber capable of applying pressure to the first valve portion 5A in such a direction as to reduce the first opening area and increase the second opening area.

The pilot chamber 35 is always in communication with the intermediate chamber 33 via the pilot flow path 35A. At least part of the pilot flow path 35A is provided in the first valve portion 5A. Specifically, the pilot flow path 35A passes through the first valve portion 5A, reaches the shaft portion 5C, and is connected to the intermediate chamber 33 at the shaft portion 5C.

2. Operation of Hydraulic Device and Features of Hydraulic Device In the hydraulic device 1 according to the present embodiment, before the dynamic pressure of hydraulic oil acts on the inlet 3A, the second opening 32 is fully closed and the first The opening 31 is fully open.

When hydraulic fluid flows into the intermediate chamber 33 from the first opening 31 , the hydraulic fluid acts on the valve body 5 to generate a dynamic pressure that displaces the valve body 5 to the right side of the drawing. When the force exerted by the dynamic pressure on the valve body 5 becomes larger than the force exerted by the spring 7 on the valve body 5, the valve body 5 begins to displace to the right side of the drawing.

As a result, during the basic operation, part of the hydraulic oil that has flowed into the intermediate chamber 33 flows into the pilot chamber 35 via the pilot flow path 35A. At this time, the first valve portion 5A is displaced to the right side of the paper surface, so the first opening area is reduced as the volume of the pilot chamber 35 is increased.

The amount of hydraulic oil supplied from the intermediate chamber 33 to the pilot chamber 35 (hereinafter referred to as "supplied oil amount") decreases as the pressure difference between the intermediate chamber 33 and the pilot chamber 35 decreases. During basic operation, the pressure (static pressure) in the intermediate chamber 33 decreases as the first opening area decreases.

Therefore, as the first opening area becomes smaller, the amount of supplied oil decreases, so that the displacement of the first valve portion 5A becomes difficult. Consequently, in the hydraulic device 1, the first opening 31 is prevented from being completely closed. Therefore, in the hydraulic device 1, occurrence of return operation failure is suppressed.

The pilot chamber 35 communicates with the outflow port 3B side through the pilot flow passage 35A, the intermediate chamber 33 and the second opening 32 . Therefore, even if the first opening 31 were to be completely closed, the pressure in the pilot chamber 35 would quickly drop. Therefore, the hydraulic device 1 is quickly restored by the elastic force of the spring 7 .

At least part of the pilot flow path 35A is provided in the first valve portion 5A. This simplifies the configuration of the hydraulic system 1 compared to the case where the pilot flow path 35A is configured by a separate component such as an external pipe, so that the size of the hydraulic system 1 can be reduced.

(Second embodiment)
The pilot chamber 35 of the hydraulic device 1 according to the above-described embodiment is configured to communicate with the space other than the pilot chamber 35 only through the pilot flow path 35A (hereinafter referred to as the first pilot flow path 35A).

On the other hand, as shown in FIG. 2, the pilot chamber 35 of the hydraulic device 1 according to the present embodiment communicates with the space other than the pilot chamber 35 via the first pilot flow path 35A and the second pilot flow path 35B. are in communication.

1. Configuration of Hydraulic Apparatus The following description relates to differences from the hydraulic apparatus according to the above-described embodiment. The same reference numerals as in the above-described embodiment are attached to the same constituent elements as in the above-described embodiment. Therefore, overlapping descriptions are omitted in the following description.

That is, the first pilot flow path 35</b>A communicates the space downstream of the first opening 31 (in the present embodiment, the intermediate chamber 33 ) and the pilot chamber 35 . The second pilot flow path 35B communicates the inlet 3A side and the pilot chamber 35 with each other.

A first throttle member R1 is detachably provided in the first pilot flow path 35A. A second throttle member R2 is detachably provided in the second pilot flow path 35B. The first throttling member R1 and the second throttling member R2 according to the present embodiment are members in which an orifice-shaped flow path is provided in a set-screw-like member (see FIG. 3).

2. Operation of Hydraulic Device and Features of Hydraulic Device In the hydraulic device 1 according to the present embodiment, hydraulic oil is supplied from the inlet 3A side to the pilot chamber 35 via the second pilot flow path 35B during basic operation. . Therefore, since the hydraulic oil can be reliably supplied to the pilot chamber 35, the hydraulic device 1 can reliably perform the basic operation.

Since the pilot chamber 35 communicates with the space downstream of the first opening 31 via the first pilot flow path 35A, even if the first opening 31 is completely closed, , the pressure in the pilot chamber 35 quickly drops. Therefore, the hydraulic device 1 is quickly restored by the elastic force of the spring 7 .

(Third embodiment)
As shown in FIG. 4, the valve body 5 of the hydraulic system 1 according to this embodiment does not include the second valve portion 5B, and the other configuration is the same as that of the hydraulic system 1 according to the second embodiment. are the same. For this reason, the same reference numerals as in the above-described embodiment are assigned to the same components as in the above-described embodiment. Redundant explanations are omitted.

In the hydraulic device 1 according to the present embodiment, the dynamic pressure of hydraulic oil introduced into the pilot chamber 35 through the second pilot flow path 35B displaces the first valve portion 5A to the right side of the drawing.
Since the pilot chamber 35 communicates with the space downstream of the first opening 31 via the first pilot flow path 35A, even if the first opening 31 is completely closed, as in the second embodiment, Even in the case of being stuck, the hydraulic device 1 can quickly perform a return operation.

(Other embodiments)
In the hydraulic device 1 according to the first embodiment, the detachable throttle member was not provided in the pilot flow path 35A. However, the invention disclosed herein is not so limited. That is, the invention may have a configuration in which, for example, a detachable throttle member is provided in the pilot flow path 35A.

The valve body 5 according to the first embodiment and the second embodiment is an integrally molded product in which the first valve portion 5A, the second valve portion 5B and the shaft portion C are integrally molded. However, the invention disclosed herein is not so limited.

The configurations shown in the above embodiments are conceptual. Accordingly, the invention disclosed herein is not so limited. Furthermore, the present disclosure is not limited to the above-described embodiments as long as it conforms to the gist of the inventions described in the above-described embodiments.

At least part of the pilot flow path 35A according to the above embodiment was provided in the first valve portion 5A. However, the invention disclosed herein is not so limited. That is, for example, in the present invention, the pilot flow path 35A may be configured by a separate component such as an external pipe.

Therefore, in the configuration in which at least two of the above-described embodiments are combined, or in the above-described embodiments, any one of the illustrated constituent elements or the constituent elements described with reference numerals is abolished. It may be configured as

DESCRIPTION OF SYMBOLS 1... Hydraulic device 3... Housing 3A... Inflow port 3B... Outflow port 3C... Storage hole 5... Valve body 5A... First valve part 5B... Second valve part 5C... Shaft part 7... Spring 31... First opening 32... Second 2 openings 33 intermediate chamber 34 back pressure chamber 34A drain channel 35 pilot chamber 35A pilot channel

Claims (2)

A hydraulic device applied to a hydraulic damper,
a housing provided with an inlet for inflow of hydraulic oil, an outlet for outflow of hydraulic oil, and a housing hole communicating with the inlet and the outlet;
a first valve portion accommodated in the accommodation hole so as to be displaceable, the first valve portion for adjusting an opening area of a first opening communicating with the inflow port;
a second valve portion displaceably housed in the housing hole, the second valve portion for adjusting an opening area of a second opening communicating with the outflow port;
a shaft portion connecting the first valve portion and the second valve portion and having a cross-sectional area smaller than that of the first valve portion and that of the second valve portion;
a spring capable of exerting an elastic force to displace the first valve portion and the second valve portion in a direction in which the opening area of the first opening increases and the opening area of the second opening decreases;
When the space in the storage hole where the shaft portion is positioned is defined as an intermediate chamber,
The inflow port can communicate with the intermediate chamber through the first opening,
The intermediate chamber can communicate with the outlet through the second opening,
Further, a pilot chamber capable of applying pressure to the first valve portion in a direction to reduce the opening area of the first opening and increase the opening area of the second opening, the pilot chamber through the pilot flow path A hydraulic system provided with a pilot chamber in constant communication only with the intermediate chamber. 2. The hydraulic system according to claim 1, wherein at least part of said pilot flow path is provided in said first valve portion.

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