JP2020094680A - Damper using pressure motor - Google Patents

Abstract

To provide a damper using a pressure motor which prevents cavitation in a hydraulic fluid caused by operation of the pressure motor and avoids troubles such as noise caused by the cavitation.SOLUTION: A damper 1 of the invention includes: a piston 3 which slides in a cylinder 2 filled with a hydraulic fluid HF and defines first and second fluid chambers 2e, 2f; a communication passage 4 which bypasses the piston 3 and communicates with the first and second fluid chambers 2e, 2f; a gear motor 5 which has an output gear 7b housed in a casing 6 communicating with the communication passage 4 and converts flow of the hydraulic fluid HF into rotational motion of the output gear 7b; and a fly wheel 9 which is rotationally driven by the output gear 7b and achieves vibration inhibition effect. Further, the damper 1 includes accumulators 21 which are provided at the communication passage 4, accumulate pressure of the hydraulic fluid HF, and compress the hydraulic fluid HF with the accumulated pressure in order to prevent cavitation in the hydraulic fluid HF.SELECTED DRAWING: Figure 1

Description

The present invention relates to a damper for suppressing vibration of a structure or the like, and more particularly to a damper using a pressure motor that converts the pressure of working fluid into rotational movement.

As this type of conventional damper, for example, the one disclosed in Patent Document 1 is known. This damper is shown in FIG. 5 of the present application. The damper 51 is provided with a cylinder 52 filled with hydraulic oil HF, a piston 53 that is slidably provided in the cylinder 52, and divides the cylinder 52 into first and second fluid chambers 52a and 52b, and a piston 53. And a communication passage 54 that communicates with the first and second fluid chambers 52a and 52b via the communication ports 52c and 52c of the cylinder 52, and a gear motor 55 provided in the communication passage 54 as a pressure motor. ..

The gear motor 55 is of the external type and has a casing 55a communicating with the communication passage 54, an input gear 55b and an output gear 55c that are housed in the casing 55a and mesh with each other, and an output that is integrally connected to the output gear 55c. It has a shaft 55d. A flywheel (rotary mass) 56 is integrally connected to the output shaft 55d. The damper 51 has two parts (not shown) in which the structure is relatively displaced, via a first mounting tool FL1 connected to the cylinder 52 and a second mounting tool FL2 connected to the piston rod 57 integrated with the piston 53. No)).

In the damper 51 having the above configuration, when the structure vibrates during an earthquake and the two parts are displaced relative to each other, the hydraulic oil HF moves in the first and second fluid chambers 52a as the piston 53 moves in the cylinder 52. , 52b from one of the first and second fluid chambers 52a, 52b into the communication passage 54 through the communication port 52c, further passing through the casing 55a of the gear motor 55. The pressure due to the flow of the hydraulic oil HF in the casing 55a is converted into the rotational motion of the output gear 55c of the gear motor 55, and the flywheel 56 is rotationally driven, so that the inertial mass effect thereof suppresses the vibration of the structure. Is obtained.

JP, 2016-94795, A

In the conventional damper 51 described above, cavitation may occur when the hydraulic oil HF flows in the communication passage 54 and the casing 55a during operation of the gear motor 55. This "cavitation" refers to a small "bubble nucleus" existing in the liquid when a pressure difference occurs in the liquid flow and the liquid pressure becomes lower than the saturated vapor pressure for a very short time. As a result, a liquid is boiled or a large number of small bubbles are generated due to release of dissolved gas.

As shown in FIG. 5, particularly in this damper 51, the passage area suddenly changes between the first or second fluid chambers 52a and 52b and the communication port 52c and the communication passage 54, and both sides of the communication portion 54 are In the bent portion existing in, the flow direction of the hydraulic oil HF changes abruptly. For this reason, the pressure difference in the flow of the hydraulic oil HF tends to increase due to turbulence of the flow, and the pressure of the hydraulic oil HF falls below the saturated vapor pressure, so that cavitation easily occurs.

Then, when cavitation occurs, there is a risk that damage and wear (erosion) of parts in the liquid may occur, and in the case of a gear motor, bubbles may collide with the surface of the rotating input/output gear. May cause a loud noise (rotating sound) or vibration.

The present invention has been made to solve the above problems, and prevents cavitation in the hydraulic oil associated with the operation of the pressure motor, thereby avoiding problems such as sounding due to cavitation. An object of the present invention is to provide a damper using a pressure motor, which is capable of

In order to achieve this object, the invention according to claim 1 of the present application is a damper using a pressure motor, which is provided with a cylinder filled with a working fluid and slidably provided in the cylinder. A piston that is divided into a first fluid chamber and a second fluid chamber, a communication passage that bypasses the piston and that communicates with the first and second fluid chambers, and a communication passage that is disposed in the communication passage and is housed in a casing that communicates with the communication passage. A pressure motor that has a rotating body that converts the flow of working fluid that accompanies sliding of the piston into rotational movement of the rotating body, a flywheel that is driven to rotate by the rotating body, and exerts a vibration suppressing effect, and communicates with the communication passage. And an accumulator configured to store the pressure of the working fluid and to pressurize the working fluid by the stored pressure in order to prevent cavitation in the working fluid.

This damper uses a pressure motor, and causes the working fluid to flow in the communication passage and the casing of the pressure motor as the piston in the cylinder slides, and the pressure of the working fluid due to the flow is rotated by the rotation of the pressure motor. By converting the body into rotary motion and driving the flywheel to rotate, the vibration suppressing effect is exerted.

Further, as the pressure motor operates, the pressure of the working fluid is stored by the accumulator provided so as to communicate with the communication passage, and the working fluid is pressurized to, for example, the saturated vapor pressure or higher by the stored pressure. As a result, cavitation in the working fluid due to the operation of the pressure motor can be prevented, and problems such as sounding due to cavitation can be avoided.

According to a second aspect of the present invention, in the damper using the pressure motor according to the first aspect, the accumulators are arranged on both sides of the pressure motor, and are composed of a pair of accumulators provided in the communication passage. And

According to this configuration, since the pair of accumulators are arranged on both sides of the pressure motor in the communication passage, pressurization of the working fluid by the accumulator is efficiently performed in a balanced manner, and cavitation is less likely to occur. As a result, the above-described operation according to claim 1 can be obtained better.

According to a third aspect of the invention, in the damper using the pressure motor according to the first or second aspect, the communication passage communicates with the first and second fluid chambers through a pair of communication ports formed in the cylinder. However, each of the pair of communication ports is characterized in that the cross-sectional area of the communication port is formed in a taper shape that gradually widens from the communication passage side toward the first or second fluid chamber side.

According to this configuration, the communication passage and the first and second fluid chambers communicate with each other through the pair of communication ports of the cylinder, and each communication port has a cross-sectional area directed toward the first or second fluid chamber side. Is formed in a tapered shape that gradually expands. With this configuration, during the operation of the pressure motor, the passage area of the working fluid gradually changes when passing through the communication port, whereby the turbulence of the working fluid and the resulting pressure difference in the flow are suppressed. Since the pressure of the working fluid is less likely to fall below the saturated vapor pressure, cavitation can be prevented more effectively.

According to a fourth aspect of the present invention, in the damper using the pressure motor according to any one of the first to third aspects, the communication passage is connected to the main passage portion in which the pressure motor and the accumulator are arranged, and the cylinder. It is characterized by having a pair of cylinder connecting portions that communicate with the first and second fluid chambers and a curved transition portion that connects the main passage portion and the pair of cylinder connecting portions.

According to this structure, the transition portion between the main passage portion of the communication passage and the pair of cylinder connecting portions is formed in a curved shape. As a result, during operation of the pressure motor, the flow direction of the working fluid does not suddenly change when the working fluid passes through the transition portion, so that the turbulence of the working fluid and the resulting pressure difference in the flow are suppressed. Since it becomes difficult for the pressure of the above to fall below the saturated vapor pressure, cavitation can be prevented more effectively.

According to a fifth aspect of the present invention, in the damper using the pressure motor according to the first aspect, a drain port for discharging the working fluid is provided in a casing of the pressure motor at a position opposite to the rotating body in the axial direction. Is formed, the pressure motor is arranged so that the drain port is located on the upper side, and the accumulator is provided in the pressure motor in a state of communicating with the drain port.

In this configuration, the pressure motor is arranged such that the drain port of the casing is located on the upper side, and the accumulator is provided in the pressure motor in a state of communicating with the drain port. Accordingly, even if air is mixed in the pressure motor, the mixed air can be satisfactorily released to the upper accumulator side via the drain port on the upper side of the casing. As a result, the amount of air mixed in the pressure motor is reduced, so that it is possible to effectively prevent cavitation and noise caused by it.

Further, when the pressure in the communication passage or the casing of the pressure motor increases due to the expansion of the hydraulic oil due to the temperature rise, the increased pressure can be accumulated in the accumulator and relieved. Further, since only one accumulator needs to be provided in the pressure motor, the cost can be reduced as compared with the case where a pair of accumulators is provided on both sides of the pressure motor in the communication passage.

According to a sixth aspect of the invention, in the damper using the pressure motor according to the fifth aspect, the communication passage is inclined obliquely upward from the first and second fluid chamber sides toward the pressure motor side. Is characterized by.

In this configuration, since the communication passage is inclined obliquely upward from the first and second fluid chamber sides toward the pressure motor side, the air in the communication passage is satisfactorily guided to the pressure motor and the drain port is opened. It can escape to the accumulator side via.

FIG. 3 is a vertical cross-sectional view showing a part of the damper according to the first embodiment of the present invention with a cutout. FIG. 8 is a vertical cross-sectional view showing a damper according to a second embodiment of the present invention with a part thereof cut away. It is sectional drawing which shows the damper which attached the soundproofing material to the gear motor. It is sectional drawing which shows two gear motors which attached the soundproof material different from each other. It is sectional drawing similar to FIG. 1 which shows the conventional damper. FIG. 11 is a vertical cross-sectional view showing a damper according to a third embodiment of the present invention with a part thereof cut away. FIG. 14 is a vertical cross-sectional view showing a damper according to a modification of the third embodiment with a part thereof cut away.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a damper 1 according to a first embodiment of the present invention includes a horizontally extending cylinder 2, a piston 3 slidably provided in the cylinder 2, a bypass of the piston 3, and an internal cylinder 2. A communication passage 4 communicating with the gear, a gear motor 5 arranged in the communication passage 4 as a pressure motor, a flywheel 9 connected to an output shaft 8 of the gear motor 5, and the like.

The cylinder 2 integrally has a cylindrical peripheral wall 2a and first and second end walls 2b and 2c provided at both ends of the peripheral wall 2a, and these three walls 2a to 2c form an internal portion of the cylinder 2. The space is defined. A concentric protrusion 2d is integrally formed on the first end wall 2b, and a first fitting FL1 is provided on the end of the first end wall 2b via a universal joint.

The piston 3 is provided in the cylinder 2 slidably in the axial direction, and the piston 3 divides the internal space of the cylinder 2 into a first fluid chamber 2e and a second fluid chamber 2f. The first and second fluid chambers 2e and 2f and the communication passage 4 are filled with hydraulic oil HF. The hydraulic oil HF is a normal one having an appropriate viscosity.

A piston rod 10 is concentrically provided integrally with the piston 3. The piston rod 10 extends from the piston 3 toward the second end wall 2c, and further extends outward in a liquid-tight manner through a rod guide hole 2g of the second end wall 2c. A second mounting tool FL2 is provided on the outer end of the piston rod 10 via a universal joint.

Further, the piston 3 is formed with a first communication hole 3a and a second communication hole 3b which penetrate in the axial direction. A first relief valve 11 and a second relief valve 12 are provided in the first and second communication holes 3a and 3b, respectively. The first and second relief valves 11 and 12 have the same configuration as each other and are configured as normally closed valves, and have a valve body and a spring for urging the valve body in the valve closing direction.

The first relief valve 11 closes the first communication hole 3a until the pressure of the hydraulic oil HF in the first fluid chamber 2e reaches the first predetermined pressure, and when the first predetermined pressure is reached, the first communication is started. The hole 3a is opened. As a result, the pressure in the first fluid chamber 2e is released to the second fluid chamber 2f side via the first communication hole 3a, and is limited to the first predetermined pressure or less. Similarly, the second relief valve 12 closes the second communication hole 3b until the pressure in the second fluid chamber 2f reaches the first predetermined pressure, and when it reaches the first predetermined pressure, the second communication hole 12b. Open 3b. As a result, the pressure in the second fluid chamber 2f is released to the first fluid chamber 2e side via the second communication hole 3b, and is limited to the first predetermined pressure or less.

A pair of communication ports 2h, 2h are formed in upper portions of both ends of the peripheral wall 2a of the cylinder 2. The communication passage 4 extends parallel to the peripheral wall 2a of the cylinder 2, extends at right angles from both ends of the main passage portion 4a in which the gear motor 5 is provided, and is connected to the communication ports 2h and 2h of the cylinder 2. It is composed of a pair of cylinder connecting portions 4b, 4b. With this configuration, the communication passage 4 communicates with the first and second fluid chambers 2e, 2f via the communication ports 2h, 2h.

The gear motor 5 is of an inscribed type and is arranged in the main passage portion 4 a of the communication passage 4. The gear motor 5 is integrally formed with a casing 6 communicating with the communication passage 4 via two inlets/outlets 6a, 6a, a rotatable input gear 7a and output gear 7b housed in the casing 6, meshing with each other, and an output gear 7b. Has an output shaft 8 provided in the. As the gear motor 5, an external contact type motor similar to the damper 51 of FIG. 5 may be used.

The flywheel 9 is made of a material having a relatively large specific gravity, such as steel. The flywheel 9 is formed, for example, in a disc shape, and is integrally provided coaxially with the output shaft 8.

Further, a pair of accumulators 21 according to the present invention are provided at both ends of the main passage portion 4a of the communication passage 4. The accumulator 21 is for accumulating the pressure of the hydraulic oil HF in order to prevent cavitation of the hydraulic oil HF in the gear motor 5 and the like, and for pressurizing the hydraulic oil HF by the accumulated pressure.

In this embodiment, the accumulator 21 is of a spring type as shown in FIG. 1, and includes a casing 22 communicating with the communication passage 4, a slidable piston 23 housed in the casing 22, and a piston 23. It has a set spring 24 that urges the communication passage 4 side. With this configuration, when the pressure of the hydraulic oil HF in the communication passage 4 rises, the hydraulic oil HF flows into the casing 22 and compresses the set spring 24 via the piston 23. As a result, the pressure of the hydraulic oil HF is stored in the accumulator 21, and the stored pressure acts on the hydraulic oil HF in the communication passage 4 and the casing 6 of the gear motor 5 to pressurize the hydraulic oil HF. It

Although not shown, the damper 1 having the above configuration is attached, for example, between two parts (for example, an upper beam and a lower beam) that are relatively displaced in a structure, via first and second fixtures FL1 and FL2. .. The operation of the damper 1 will be described below.

First, when the structure is not vibrating, the damper 1 is in the initial state shown in FIG. 1, and the piston 3 is located at the center of the cylinder 2 in the axial direction.

From this initial state, when the structure vibrates during an earthquake or the like, the piston 3 moves in the cylinder 2 according to the relative displacement between the two parts of the structure. Along with this, the hydraulic oil HF in the first or second fluid chamber 2e, 2f is pushed out by the piston 3, flows into the communication passage 4 via the communication port 2h, and further flows into the casing 6 of the gear motor 5.

The pressure due to the flow of the hydraulic oil HF is converted into the rotational movement of the input gear 7a and the output gear 7b of the gear motor 5, and the flywheel 9 integrated with the output shaft 8 is rotationally driven, whereby the rotary inertia mass effect ( Inertia) is exerted. Further, the viscous damping effect (viscous force) due to the viscous resistance when the hydraulic oil HF flows in the communication passage 4 and the like is exerted, so that the vibration suppression effect of the structure is exerted together with the rotary inertia mass effect.

Further, when the gear motor 5 operates in this way, the hydraulic oil HF flows into the casing 22 of the accumulator 21 as the pressure of the hydraulic oil HF in the communication passage 4 rises, and the set spring is passed through the piston 23. Compress 24. As a result, the pressure of the hydraulic oil HF is accumulated in the accumulator 21, and the accumulated pressure acts on the hydraulic oil HF in the communication passage 4 and the casing 6 of the gear motor 5, so that the hydraulic oil HF becomes saturated vapor pressure, for example. It is pressurized above.

Furthermore, since the pair of accumulators 21, 21 are arranged in the vicinity of the gear motor 5 and on both sides thereof, the pressurization of the hydraulic oil HF by the accumulator 21 can be efficiently performed with good balance. As described above, it is possible to prevent cavitation in the hydraulic oil HF that accompanies the operation of the gear motor 5, and it is possible to avoid problems such as sounding due to cavitation.

Next, a damper 31 according to the second embodiment of the present invention will be described with reference to FIG. In the figure, the same or equivalent components as those of the damper 1 of the first embodiment described above are designated by the same reference numerals. As is clear from a comparison with FIG. 1, the damper 31 is different from the damper 1 of the first embodiment in the piping shape of the communication passage and the shape of the communication opening of the cylinder 2.

Specifically, in the damper 1, the connecting portion between the main passage portion 4a of the communication passage 4 and the pair of cylinder connecting portions 4b and 4b is bent, whereas in the damper 31, the main passage portion of the communication passage 4 is bent. 4c and the pair of cylinder connecting portions 4d and 4d are connected via curved transition portions 4e and 4e.

Further, in the damper 1, the diameter of the communication port 2h of the cylinder 2 is constant and equal to the inner diameter of the communication portion 4, whereas in the damper 31, the communication port 2i of the cylinder 2 is formed in a tapered shape. Specifically, the diameter of the communication port 2i is equal to the inner diameter of the communication passage 4 at the opening on the communication passage 4 side, and is formed so as to gradually widen toward the first or second fluid chamber 2e, 2f side. There is.

According to the above configuration, when the gear motor 5 is operated, the flow direction of the hydraulic oil HF does not suddenly change when the hydraulic oil HF passes through the transition portion 4e of the communication passage 4, so that the flow of the hydraulic oil HF is disturbed or caused by it. The pressure difference in the flowing flow is suppressed. Further, when the hydraulic oil HF passes through the communication port 2i of the cylinder 2, the passage area of the hydraulic oil HF gradually changes, so that the turbulence of the flow of the hydraulic oil HF and the pressure difference in the flow are suppressed. As a result, the pressure of the hydraulic oil HF is less likely to fall below the saturated vapor pressure, so that cavitation can be prevented more effectively.

Next, a damper 41 according to a modified example of the first embodiment will be described with reference to FIG. In addition to the above-mentioned cavitation prevention function, the damper 41 has a soundproof function so as to reduce the audible noise (rotational noise) even if the gear motor 5 produces noise due to cavitation or other causes. is there.

In this damper 41, the gear motor 5 is arranged such that the casing 6 is located on the lower side and the output shaft 8 extends upward. The casing 6 is supported on the peripheral wall 2a of the cylinder 2 via a vibration-proof rubber 42.

As shown in FIG. 4A, the inside of the casing 6 is divided into a central gear accommodating chamber 6c and upper and lower soundproof chambers 6d and 6d by upper and lower partition plates 6b and 6b. The gear accommodating chamber 6c communicates with the communication passage 4, and the gear accommodating chamber 6c accommodates an input gear 7a and an output gear 7b. The upper and lower soundproof chambers 6d, 6d communicate with the gear accommodating chamber 6c, and each soundproof chamber 6d is filled with hydraulic oil HF.

According to this configuration, even if noise is generated in the gear motor 5, the generated noise can be reduced by the antivibration rubber 42 provided between the cylinder 2 and the casing 6. Further, the hydraulic oil HF filled in the upper and lower soundproof chambers 6d, 6d also functions as a soundproof material against the noise generated in the gear accommodating chamber 6c. As a result, the sound noise can be further reduced in combination with the anti-vibration rubber 42, and good soundproof performance can be exhibited.

As shown in FIG. 4( b ), the soundproof chambers 6 d, 6 d of the casing 6 may be filled with a vibration isolator 43 instead of the hydraulic oil HF. The vibration-proof material 43 is made of a material having a vibration-proof property, such as glass wool, and is also wound around the outer periphery of the communication passage 4 in this example. Therefore, also with this configuration, good soundproof performance against the noise of the gear motor 5 can be exhibited.

Next, a damper 51 according to the third embodiment of the present invention will be described with reference to FIG. In the figure, the same or equivalent components as those of the damper 1 of the first embodiment of FIG. 1 are designated by the same reference numerals. The damper 51 is different from the damper 1 in that the output shaft 8 and the flywheel 9 of the gear motor 5 are arranged downward and that the accumulator 21 is attached to the gear motor 5.

Specifically, the casing 6 of the gear motor 5 is provided with a drain port (not shown) for discharging the hydraulic oil HF at a position opposite to the output shaft 8 in the axial direction. The mouth communicates with the communication passage 4. Contrary to the damper 41 of FIG. 3, the gear motor 5 is arranged such that the output shaft 8 and the flywheel 9 are located on the lower side and the drain port is located on the upper side.

The accumulator 21 is of a spring type having a casing 22, a piston 23 and a set spring 24, as in the first and second embodiments. Further, the accumulator 21 is composed of a single accumulator, and is provided in the gear motor 5 with the casing 22 communicating with the drain port of the gear motor 5.

In addition, the communication passage 4 is connected to the first and second fluid chambers 2e and 2f and extends upward, and a pair of cylinder connecting portions 4f and 4f. 5 has a pair of inclined portions 4g, 4g connected to the casing 6.

According to the above configuration, since the accumulator 21 communicates with the casing 6 of the gear motor 5 and the communication passage 5 via the drain port, the pressure of the hydraulic oil HF is stored in the accumulator 21 as in the first embodiment. At the same time, the accumulated pressure acts on the hydraulic fluid HF in the communication passage 4 and the casing 6, whereby it is possible to avoid problems such as cavitation in the hydraulic fluid HF and noise caused by the cavitation.

Further, even if air is mixed in the gear motor 5, the mixed air can be satisfactorily released to the upper accumulator 21 side via the upper drain port of the casing 6. As a result, the amount of air mixed in the gear motor 5 is reduced, so that it is possible to effectively prevent cavitation and noise caused by it. Further, since the inclined portion 4g of the communication passage 4 is inclined obliquely upward toward the gear motor 5 side, while properly guiding the air in the communication passage 4 to the gear motor 5, the accumulator 21 side is provided via the drain port. Can be escaped to.

Further, when the pressure in the communication passage 4 and the casing 6 of the gear motor 5 increases due to the expansion of the hydraulic oil HF due to the temperature rise, the increased pressure can be accumulated in the accumulator 21 and can be relieved. Further, since only one accumulator 21 is provided in the gear motor 5, the cost can be reduced as compared with the first embodiment in which a pair of accumulators 21 are provided on both sides of the gear motor 5 in the communication passage 4.

Next, a damper 61 according to the modified example of the third embodiment will be described with reference to FIG. 7. In the figure, the same or equivalent components as those of the damper 51 of the third embodiment are designated by the same reference numerals. The damper 61 is different in that a pressure relaxation buffer 71 is used as an accumulator instead of the spring type accumulator 21 of the damper 51.

The pressure relaxation buffer 71 includes a casing 72 that communicates with a drain port (not shown) of the casing 6 of the gear motor 5. The casing 72 is sealed by the upper lid 73 in the state where the air A is present.

In this configuration, when the gear motor 5 operates, as the pressure of the hydraulic oil HF in the communication passage 4 and the casing 6 of the gear motor 5 rises, the hydraulic oil HF flows into the casing 72 of the pressure relaxation buffer 71. Then, the air A in the casing 72 is compressed. Due to the compressibility of the air A, the pressure of the hydraulic oil HF is accumulated, and the hydraulic oil HF is pressurized by the accumulated pressure. As described above, the pressure relaxation buffer 71 functions as an accumulator similarly to the accumulator 21 of the third embodiment, and thus the same operation as that of the third embodiment can be obtained.

The present invention is not limited to the first and second embodiments and the modified examples described above, and can be implemented in various aspects. For example, in the embodiment, the gear motor is used as the pressure motor, but other types of pressure motors such as a piston motor, a vane motor, and a screw motor may be used. The pressure motor is configured to convert the flow of the working fluid into the rotary motion of the rotating body, and when cavitation occurs, noise is easily generated due to the rotation of the rotating body, and thus the advantages of the present invention are effectively exerted. Obtainable. Further, in the embodiment, it is described that the normal working oil HF is used as the working fluid of the damper, but it goes without saying that another suitable working fluid may be used.

Further, as the accumulator, in the embodiment, a spring type accumulator 21 having a piston 23 and a set spring 24 is used, and in the modification of FIG. 7, a gas type pressure buffer buffer 71 utilizing the compressibility of air is used. However, as long as it has a function of accumulating the pressure of the working fluid and pressurizing the working fluid with the accumulated pressure, its type is arbitrary, and for example, an accumulator of a bladder type or a diaphragm type can be used.

Further, in the first and second embodiments, the accumulators 21 are arranged in pairs on both sides of the gear motor 5 in the communication passage 4, but only one accumulator 21 may be arranged on one side of the gear motor 5. In addition, the detailed configuration can be appropriately changed within the scope of the gist of the present invention.

1 Damper according to the first embodiment 2 Cylinder 2e First fluid chamber 2f Second fluid chamber 2i Communication port 3 Piston 4 Communication passage 4c Main passage portion 4d Cylinder connection portion 4e Transition portion 5 Gear motor (pressure motor)
6 Casing 7b Output gear (rotating body)
9 Flywheel 21 Accumulator 31 Damper according to the second embodiment 41 Damper according to the modification 51 Damper according to the third embodiment 4g Slope of the communication passage 61 Damper according to the modification of the third embodiment 71 Pressure relief buffer (accumulator)
HF hydraulic oil (working fluid)

Claims (6)

A cylinder filled with working fluid,
A piston provided slidably in the cylinder for partitioning the cylinder into a first fluid chamber and a second fluid chamber;
A communication passage that bypasses the piston and communicates with the first and second fluid chambers;
A pressure motor disposed in the communication passage, having a rotating body housed in a casing communicating with the communication passage, and converting a flow of the working fluid accompanying the sliding of the piston into a rotational movement of the rotating body;
A flywheel that is rotationally driven by the rotating body and exhibits a vibration suppressing effect,
An accumulator that is provided so as to communicate with the communication passage, stores the pressure of the working fluid in order to prevent cavitation in the working fluid, and pressurizes the working fluid by the stored pressure,
A damper using a pressure motor, comprising: The damper using the pressure motor according to claim 1, wherein the accumulator comprises a pair of accumulators provided in the communication passage and arranged on both sides of the pressure motor. The communication passage communicates with the first and second fluid chambers through a pair of communication ports formed in the cylinder,
Each of the pair of communication ports is formed in a tapered shape in which a cross-sectional area of the communication port gradually widens from the communication passage side toward the first or second fluid chamber side. A damper using the pressure motor according to Item 1 or 2. The communication passage includes a main passage portion in which the pressure motor and the accumulator are arranged, a pair of cylinder connection portions that are connected to the cylinder and communicate with the first and second fluid chambers, the main passage portion, and the main passage portion. A damper using the pressure motor according to any one of claims 1 to 3, further comprising a curved transition portion connecting a pair of cylinder connecting portions. A drain port for discharging the working fluid is formed in the casing of the pressure motor at a position opposite to the rotating body in the axial direction,
The said pressure motor is arrange|positioned so that the said drain port may be located above, The said accumulator is provided in the said pressure motor in the state connected to the said drain port, The claim 1 characterized by the above-mentioned. A damper that uses a pressure motor. The damper using a pressure motor according to claim 5, wherein the communication passage is inclined obliquely upward from the first and second fluid chamber sides toward the pressure motor side.

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