JP4540965B2 - Hydraulic damper - Google Patents

Description

  The present invention relates to a hydraulic damper.

  Conventionally, hydraulic dampers have been used to reduce the shaking of buildings due to earthquakes and winds. The hydraulic damper is installed, for example, between the beams and columns in the building via a brace, and suppresses the shaking of the building by the damping force of the hydraulic damper.

  As a hydraulic damper for vibration control that suppresses shaking of a building, a one-sided rod type in which a piston rod is attached only to one side of a piston that moves in a cylinder is usually used. In this hydraulic damper, for example, as shown in FIG. 5, the inside of a cylinder 100 is divided into two hydraulic oil chambers 102 and 103 by a piston 101, and the hydraulic oil is passed between the two hydraulic oil chambers, for example. Two oil passages 104 and 105 are formed to flow. One oil passage 104 is provided with a relief valve 107 that allows only hydraulic oil to flow from the hydraulic oil chamber 102 on the head side of the cylinder 100 to the hydraulic oil chamber 103 on the rod side where the piston rod 106 is located. The other oil passage 105 is provided with a check valve 108 that allows only the hydraulic oil to flow from the hydraulic oil chamber 103 to the hydraulic oil chamber 102. The relief valve 107 is opened only when the hydraulic oil chamber 103 becomes a predetermined pressure or higher. For example, when the piston rod 106 in contact with the brace of the building is pushed and the piston 101 moves to the head side of the cylinder 100, the hydraulic oil on the hydraulic oil chamber 102 side is compressed, and the hydraulic oil on the hydraulic oil chamber 102 side is compressed. Moves to the hydraulic oil chamber 103 side through the relief valve 107. A resistance force against the movement of the piston 101 is generated by the fluid resistance at the time of the movement of the hydraulic oil, and this resistance force is transmitted as a damping force to the building via the piston rod 106, thereby suppressing the shaking of the building.

  By the way, in order to absorb the pressure fluctuation in the hydraulic oil chamber caused by the volume difference between the hydraulic oil chamber 102 and the hydraulic oil chamber 103, the volume fluctuation of the hydraulic oil accompanying the temperature change, and the like. , An accumulator 109 for temporarily storing the energy of hydraulic oil in the cylinder is attached. The accumulator 109 has been conventionally attached separately to the outer wall of the cylinder 100, and the accumulator 109 portion has largely protruded outward from the outer wall of the cylinder 100 (see, for example, Patent Document 1).

  However, as described above, when the accumulator protrudes from the outer surface of the cylinder, the radial width of the hydraulic damper is widened, and the entire hydraulic damper is large. For this reason, it is difficult to install the conventional hydraulic damper in a narrow place, and the buildings and places where the hydraulic damper can be installed are limited. Also, because the accumulator part protrudes, the entire hydraulic damper has a shape that is difficult to lift and carry. In addition, if the accumulator part protrudes greatly, there is a concern that the accumulator part may collide with a pillar or the like during transportation of a hydraulic damper. If the accumulator part protrudes, it is not preferable from the viewpoint of the design of the entire hydraulic damper. Further, in the conventional hydraulic damper, since the cylinder portion and the accumulator are separately manufactured and assembled, the number of parts of the entire hydraulic damper is large, and the manufacturing and assembling process is complicated.

JP 2000-94937 A

  The present invention has been made in view of such points, and an object of the present invention is to provide a hydraulic damper that is slimmer and smaller than the conventional one and has a reduced number of parts.

In order to achieve the above object, the present invention provides a hydraulic damper in which a piston rod is attached to one side of a piston that moves in a cylinder, and the cylinder is connected to the head side of the cylinder by the piston. Two hydraulic oil chambers divided into a rod side with a piston rod are provided, and an oil passage that connects the hydraulic oil chamber on the head side and the hydraulic oil chamber on the rod side is formed in the piston . The oil passage has a relief valve that allows only a one-way flow from the head side hydraulic oil chamber to the rod side hydraulic oil chamber, and the rod side hydraulic oil chamber to the head side hydraulic oil chamber. and a check valve for allowing only one-way flow to the respectively provided elastic body for urging the piston rod in the direction of projecting from the cylinder is provided, said cylinder coaxially The accumulator is provided in conjunction with the hydraulic oil chamber of the rod-side, the tubular body integral with the outer wall and the outer wall of the cylinder of the accumulator is formed, said accumulator than the hydraulic oil chamber of the head side It is provided on the head side of the cylinder and directly communicates only with the hydraulic oil chamber on the rod side . The “rod side of the cylinder” is the opposite side of the cylinder head side.

  According to this invention, since the accumulator is provided coaxially with the cylinder, the accumulator does not protrude greatly from the outer wall of the cylinder as in the prior art, and the overall shape of the hydraulic damper is made slim. As a result, the hydraulic damper is downsized, and for example, the hydraulic damper can be installed in a narrower place. In addition, the hydraulic damper can be easily held and transported, and damage to the accumulator during transport can be prevented. Furthermore, since an integral cylinder is formed by the outer wall of the accumulator and the outer wall of the cylinder, it is not necessary to manufacture the accumulator separately from the cylinder. For example, the accumulator can be formed in the cylinder of the cylinder. As a result, the number of parts of the hydraulic damper can be reduced, the configuration of the hydraulic damper can be simplified, and the manufacture and assembly of the hydraulic damper can be performed more easily.

In such a case, the accumulator is provided in the cylinder so as not to hinder the movement of the piston rod and the piston.

  The accumulator may include an oil chamber that stores hydraulic oil and communicates with the hydraulic oil chamber on the rod side, and a pressurization chamber that applies a constant pressure to the oil chamber. The accumulator may include an accumulator piston that separates an oil chamber and a pressurizing chamber of the accumulator, and the pressurizing chamber may be provided with an elastic member that presses the accumulator piston.

The hydraulic oil flow path for communicating the oil chamber of the accumulator and the hydraulic oil chamber on the rod side may be formed by a pipe line disposed along the outer wall of the cylinder. You may form so that it may pass. When the flow path is formed so as to pass through the cylinder, the flow path penetrates from the inside of the piston to the oil chamber of the accumulator and moves together with the piston, and the rod Formed by a connecting flow path that connects the hydraulic fluid chamber on the side and the conduit, and a partition and a seal between the hydraulic fluid chamber on the head side and the accumulator have a bearing and a seal at a portion through which the conduit passes. It may be provided and the tube may be slidable with respect to the partition wall . In this case, since a hydraulic oil passage for communicating the oil chamber of the accumulator and the hydraulic oil chamber on the rod side is provided in the cylinder, there is no protrusion on the outer wall surface of the cylinder, and the hydraulic damper is further provided. Slimming and miniaturization can be achieved.

  According to the present invention, space saving of the installation position of the hydraulic damper is achieved, so that the degree of freedom of the installation position of the hydraulic damper is increased. In addition, the hydraulic damper can be easily transported and damage during transport is reduced. In addition, the design of the hydraulic damper is improved.

  Hereinafter, preferred embodiments of the present invention will be described. FIG. 1 is a longitudinal sectional view showing an outline of a configuration of a hydraulic damper 1 according to the present embodiment.

  The hydraulic damper 1 includes, for example, a substantially cylindrical cylinder 2, and a piston 3 is provided in the cylinder 2. The piston 3 is movable along the axial direction of the cylinder 2 (X direction in FIG. 1). Two hydraulic oil chambers 4 and 5 divided by the piston 3 are formed on both sides of the piston 3. The hydraulic oil chambers 4 and 5 are filled with hydraulic oil P. The first hydraulic oil chamber 4 is formed, for example, on the positive side in the X direction (left side in FIG. 1), which is the head side of the cylinder 2, and the second hydraulic oil chamber 5 is the X side on the rod side of the cylinder 2. It is formed on the negative direction side (the right side in FIG. 1).

  A cylindrical piston rod 6 is connected to the end surface of the piston 3 on the negative side in the X direction. The piston rod 6 passes through the cylinder 2 from the end face of the piston 3 and protrudes to the outside of the cylinder 2 on the X direction negative direction side. External force applied from a building or the like is transmitted to the piston 3 through the piston rod 6.

  In the piston 3, a plurality of, for example, two oil passages 10 and 11 communicating with the first hydraulic oil chamber 4 and the second hydraulic oil chamber 5 are formed. The oil passage 10 is provided with a check valve 13, and the oil passage 11 is provided with a relief valve 14.

  The check valve 13 is opened only when the hydraulic oil P is about to flow from the second hydraulic oil chamber 5 to the first hydraulic oil chamber 4, and from the second hydraulic oil chamber 5 side to the first hydraulic oil chamber 4. Only allow unidirectional flow to the side. That is, the hydraulic oil P flows only through the check valve 13 in the positive direction of the X direction.

  The relief valve 14 is opened only when the hydraulic fluid P in the first hydraulic fluid chamber 4 exceeding a predetermined relief load is about to flow from the first hydraulic fluid chamber 4 to the second hydraulic fluid chamber 5. Only the flow in one direction from the first hydraulic oil chamber 4 side to the second hydraulic oil chamber 5 side is allowed. That is, the hydraulic oil P flows through the relief valve 14 to the X direction negative direction side only when it exceeds a predetermined relief load and flows from the first hydraulic oil chamber 4 to the second hydraulic oil chamber 5. Instead of the relief valve 14, it is also possible to use a pressure regulating valve or an orifice that generates a linear damping force according to the piston speed.

  An accumulator 21 is formed on the positive side in the X direction with respect to the first hydraulic oil chamber 4 in the cylinder 2 with a partition wall 20 forming the first hydraulic oil chamber 4 interposed therebetween. The accumulator 21 includes, for example, an oil chamber 22 filled with hydraulic oil P on the partition wall 20 side, and a pressure chamber 23 that pressurizes the oil chamber 22 with a constant pressure on the head side of the cylinder 2. The oil chamber 22 and the pressurizing chamber 23 of the accumulator 21 are provided along the axial direction of the cylinder 2 and are formed using a part of the inner side surface of the outer wall of the cylinder 2. The pressurizing unit 23 is provided with a pressure accumulating piston 24 facing the oil chamber 22 and a pressure accumulating spring 25 as an elastic member that presses the pressure accumulating piston 24 from the head side to the oil chamber 22 side. The oil chamber 22 communicates with the second hydraulic oil chamber 5 by a pipe line 26 formed along the outer wall of the cylinder 2. With this configuration, for example, when the pressure in the second hydraulic oil chamber 5 fluctuates, the pressure in the oil chamber 22 of the accumulator 21 also fluctuates, and the pressure accumulating piston 24 moves correspondingly to change the volume of the oil chamber 22. Is done. As a result, the accumulator 21 in the cylinder 2 causes excess or deficiency of the hydraulic fluid P in the second hydraulic fluid chamber 5 due to, for example, a volume difference between the first hydraulic fluid chamber 4 and the second hydraulic fluid chamber 5, A change in volume of the hydraulic oil P due to a temperature change can be absorbed.

  A spring 30 that urges the piston rod 6 toward the X direction negative direction side is provided at the end of the cylinder 2 on the X direction negative direction side. With this spring 30, the end of the piston rod 6 on the negative side in the X direction can be kept in contact with a part of the building that attenuates the vibration.

  The hydraulic damper 1 configured as described above is fixed to a column 41 and a beam 42 of a building 40, for example, as shown in FIG. A brace 43 is attached to the column 41 and the beam 42 of the building 40, and the piston rod 6 of the hydraulic damper 1 is in contact with the brace 43 in a state where the tip portion is biased to the brace 43.

  For example, when the building 40 is shaken and the brace 43 vibrates, an external force is applied to the piston rod 6 and the piston 3 in the cylinder 2 moves to the X direction positive direction side. At this time, when the hydraulic oil P in the first hydraulic oil chamber 4 is compressed and exceeds the relief load, the relief valve 14 is opened, and the hydraulic oil P in the first hydraulic oil chamber 4 passes through the relief valve 14 to the first pressure. 2 flows into the hydraulic fluid chamber 5. A resistance force acts on the piston 3 on the negative side in the X direction due to a load caused by fluid resistance or relief load when the hydraulic oil P passes through the relief valve 14. This resistance force acts on the brace 43 through the piston rod 6, and the vibration of the brace 43 is attenuated and the shaking of the building 40 is suppressed.

  Further, when the piston 3 moves to the positive side in the X direction and the hydraulic oil P in the first hydraulic oil chamber 4 moves to the second hydraulic oil chamber 5, for example, the hydraulic oil in the second hydraulic oil chamber 5 Since P becomes excessive by the volume of the piston rod 6 inserted into the cylinder 2, the accumulator 21 absorbs the corresponding amount of hydraulic oil P and stabilizes the pressure in the second hydraulic oil chamber 5.

  When the piston 3 in the cylinder 2 returns to the X direction negative direction side, the check valve 13 is opened due to the pressure increase on the second hydraulic oil chamber 5 side, and the hydraulic oil P on the second hydraulic oil chamber 5 side is discharged. It flows to the first hydraulic oil chamber 4 side through the check valve 13. At this time, the accumulator 21 replenishes the second hydraulic oil chamber 5 with, for example, a shortage of hydraulic oil P, and stabilizes the pressure in the second hydraulic oil chamber 5. Moreover, since the piston rod 6 is urged | biased by the X direction negative direction side with the spring 30, the contact with the piston rod 6 and the brace 43 is maintained at this time.

  According to the above embodiment, since the accumulator 21 is provided coaxially with the cylinder 2, the entire hydraulic damper 1 is slimmed and miniaturized. As a result, the hydraulic damper 1 can be installed in a narrower place. Further, the hydraulic damper 1 can be easily transported, and the accumulator 21 can be prevented from being damaged during transport. Furthermore, the protrusion by the accumulator 21 is eliminated, and the design is improved.

  Since the accumulator 21 is provided closer to the head side of the cylinder 2 than the first hydraulic oil chamber 4, the movement of the piston rod 6 is not hindered. Further, the cylinder 2 is provided with the accumulator piston 24 and the accumulator spring 25 in the oil chamber 22 and the pressurizing chamber 23 along the axial direction, and the cylinder 2 is used as a container for the accumulator 21, so that the accumulator 21 and the cylinder Compared with the case where 2 is provided separately, the number of parts of the hydraulic damper 1 can be reduced and the configuration can be simplified.

  Since the pipe line 26 connecting the second hydraulic oil chamber 5 and the oil chamber 22 of the accumulator 21 is formed along the side surface of the cylinder 2, the size of the protrusion formed on the outer surface of the cylinder 2 is minimized. be able to.

  In the above embodiment, the pipe line 26 connecting the second hydraulic oil chamber 5 and the oil chamber 22 is formed along the side surface of the cylinder 2, but may be formed in the cylinder 2. FIG. 3 shows an example of such a case. In the cylinder 2, a pipe line that penetrates the first hydraulic oil chamber 4 and the partition wall 20 from the inside of the piston 3 and reaches the oil chamber 22 of the accumulator 21. 50 is provided. Between the pipe 50 and the partition wall 20, a bearing 51 that allows the pipe 50 to move in the X direction and a seal member 52 that prevents the hydraulic oil P from leaking are provided. The pipe line 50 is fixed to the piston 3 and moves together with the piston 3. The pipe 50 is formed so that the end on the positive side in the X direction is always in the oil chamber 22 even if it moves integrally with the piston 3.

  In the piston 3, for example, a connection channel 53 that connects the second hydraulic oil chamber 5 and the pipe 50 is formed. The connection fluid 53 and the conduit 50 allow the second hydraulic oil chamber 5 and the oil chamber 22 of the accumulator 21 to communicate with each other, and the oil chamber 22 can absorb pressure fluctuations in the second hydraulic oil chamber 5 and the like. According to this example, since the pipe line 50 is formed in the cylinder 2, there is no protrusion on the outer surface of the cylinder 2, and the hydraulic damper 1 is further reduced in size and size.

  According to the above embodiment, the accumulator 21 is provided on the head side with respect to the first hydraulic oil chamber 4, but the accumulator 21 may be provided on the rod side of the cylinder 2 with respect to the second hydraulic oil chamber 5. Good.

  FIG. 4 shows an example of the hydraulic damper 60 in such a case, and the wall 61 on the X direction negative direction side of the second hydraulic oil chamber 5 is formed to be movable in the X direction. This wall 61 operates as a pressure accumulating piston of the accumulator. A pressurizing chamber 62 for pressurizing the wall 61 toward the second hydraulic oil chamber 5 with a constant pressure is formed on the further negative side of the wall 61 in the X direction. The pressurizing chamber 62 is provided with a pressure accumulation spring 63 as an elastic member, and presses the wall 61 with a constant pressure. The piston rod 6 penetrates the wall 61 and the pressurizing chamber 62. Between the wall 61 and the piston rod 6, a bearing 64 that allows the piston rod 6 to move in the X direction, and a second operation. A seal member 65 that prevents leakage of the hydraulic oil P in the oil chamber 5 is provided. A seal member 66 is also provided between the wall 61 and the cylinder 2. In addition, since the other structural members of the hydraulic damper 60 are the same as the hydraulic damper 1 described above, the description thereof is omitted.

  In the hydraulic damper 60, the wall 61 operates due to the pressure fluctuation in the second hydraulic oil chamber 5, and the volume of the second hydraulic oil chamber 5 itself changes. The change in the volume of the second hydraulic oil chamber 5 can absorb the pressure change or volume change of the hydraulic oil P in the second hydraulic oil chamber 5. Therefore, in this example, the wall 61, the pressurizing chamber 62, the pressure accumulating spring 63, and the second hydraulic oil chamber 5 are integrated to function as an accumulator. Also in this case, since the accumulator is built in the cylinder 2, the hydraulic damper 60 can be made slim and small. Further, compared with the hydraulic damper 1 of the above-described embodiment, the size can be further reduced by the absence of the oil chamber 22, and the number of parts can be reduced.

  As mentioned above, although some examples of embodiment of this invention were demonstrated, this invention can take not only this example but a various aspect. For example, the accumulator 21 described in the above embodiment is a piston type, but may be another type, for example, a diaphragm type or a bladder type. The installation position of the spring 30 is not limited to the outside of the cylinder 2 and may be installed in the first hydraulic oil chamber 4 in the cylinder 2, for example. In the above embodiment, the oil passages 10 and 11 and the check valve 13 and the relief valve 14 are formed inside the piston 3. However, in the present invention, the oil passage, the check valve and the relief valve are formed outside the cylinder 2. It is also applicable when Further, in the above embodiment, the present invention is applied to the hydraulic damper installed between the column 41 and the beam 42 of the building 40. However, the present invention can be applied to the hydraulic pressure installed at other positions in the building 40. It can also be applied to dampers.

  The present invention is useful when slimming down and downsizing a hydraulic damper that suppresses shaking of a building.

It is explanatory drawing of the longitudinal cross-section which shows the outline of a structure of the hydraulic damper concerning embodiment. It is explanatory drawing which shows the example of installation to the building of a hydraulic damper. It is explanatory drawing of the longitudinal cross-section which shows the outline of a structure of the hydraulic damper which provided the pipe line in the cylinder. It is explanatory drawing of the longitudinal cross-section which shows the outline of a structure of the hydraulic damper which provided the accumulator in the rod side of the cylinder. It is explanatory drawing which shows the outline of a structure of the conventional hydraulic damper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic damper 2 Cylinder 3 Piston 4 1st hydraulic oil chamber 5 2nd hydraulic fluid chamber 6 Piston rod 21 Accumulator 22 Oil chamber 23 Pressurization chamber 24 Piston for pressure accumulation 25 Spring for pressure accumulation

Claims (6)

A hydraulic damper in which a piston rod is attached to one side of a piston that moves in a cylinder,
In the cylinder, there are provided two hydraulic oil chambers divided by the piston into a head side of the cylinder and a rod side with the piston rod,
A pair of oil passages communicating the head side hydraulic oil chamber and the rod side hydraulic oil chamber are formed in the piston, and the pair of oil passages are connected to the rod side hydraulic oil chamber from the head side hydraulic oil chamber. A relief valve that allows only one-way flow to the hydraulic oil chamber, and a check valve that allows only one-way flow from the rod-side hydraulic oil chamber to the head-side hydraulic oil chamber, respectively.
An elastic body for biasing the piston rod in a direction protruding from the cylinder;
On the same axis as the cylinder, an accumulator that is linked to the hydraulic oil chamber on the rod side is provided, and an integral cylinder is formed by the outer wall of the accumulator and the outer wall of the cylinder ,
The hydraulic damper is characterized in that the accumulator is provided closer to the head of the cylinder than the hydraulic fluid chamber on the head side, and is in direct communication with only the hydraulic fluid chamber on the rod side . The accumulator is
An oil chamber in which hydraulic oil is stored and communicated with the hydraulic oil chamber on the rod side;
To further comprising a, a pressure chamber for providing a constant pressure against the oil chamber, according to claim 1, wherein the hydraulic damper. The accumulator includes a pressure accumulating piston that separates an oil chamber and a pressure chamber of the accumulator,
The hydraulic damper according to claim 2 , wherein an elastic member that presses the pressure-accumulating piston is provided in the pressurizing chamber. The hydraulic oil passage for communicating the oil chamber of the accumulator and the hydraulic oil chamber on the rod side is formed by a pipe line disposed along the outer wall of the cylinder. Item 4. The hydraulic damper according to Item 3 . 4. The hydraulic pressure according to claim 3 , wherein a flow path of hydraulic oil for connecting the oil chamber of the accumulator and the hydraulic oil chamber on the rod side is formed so as to pass through the cylinder. damper. The flow path is
A pipe that penetrates from the inside of the piston to the oil chamber of the accumulator and moves integrally with the piston;
Formed by a connecting flow path connecting the hydraulic oil chamber on the rod side and the pipe line,
The partition wall between the hydraulic fluid chamber on the head side and the accumulator is provided with a bearing and a seal at a portion through which the pipe passes, and the tube body is slidable with respect to the partition wall. The hydraulic damper according to claim 5 .

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