JP4998876B2 - Oil damper manufacturing method - Google Patents

Description

The present invention relates to a process for the production of oil damper over for use in seismic control of such buildings.

  An oil damper used for damping a building or the like generally includes a cylinder in which hydraulic oil is sealed, a piston that defines the inside of the cylinder in two chambers, one end connected to the piston, and the other end. A piston rod extending through the cylinder through a rod guide provided at the opening end of the cylinder, and generating a damping force due to the flow resistance of the hydraulic oil associated with the relative movement of the piston rod and the cylinder (See, for example, Patent Document 1).

JP 2002-295567 A

  By the way, this type of oil damper is shipped after it is completed as a product, and after performing a vibration test to confirm performance, oil leakage, and the like. However, the rod guide and the piston rod are usually double-sealed by an oil seal and a dust seal mounted on the rod guide so as to be separated from the inside and outside of the cylinder. For this reason, in the vibration test described above, even if oil leaks from the oil seal inside the cylinder, the oil seal to the outside is stopped in the short term by the dust seal outside the cylinder, and there is an error that there is no oil leak. There was a risk of being judged.

The present invention has been made in view of the conventional problems described above, and has as its object to provide a method for producing oil damper over to reliably grasp the existence of oil leakage by excitation test before shipment There is.

In order to solve the above-described problems, the present invention extends a piston rod connected to a piston in a cylinder in which hydraulic oil is sealed, through a rod guide provided at the opening end of the cylinder, and extends out of the cylinder. The rod guide and the piston rod are doubly sealed by an oil seal and a dust seal that are mounted on the rod guide and spaced apart from the inside and outside of the cylinder, and the oil seal is attached to the rod guide. And a through hole provided in a linear shape with one end opened on the inner circumferential surface located between the dust seal and the other end opened on the outer circumferential surface of the rod guide,
It is characterized by performing an oscillating step of oscillating by setting the through hole of the oil damper in a vibration testing machine so as to face downward, and an attaching step of attaching a plug to the through hole .

In this manner manufacturing by oil dampers, upon excitation test after completion, when a fluid leaks from the emergency cylinder inner oil seal, the leak oil flows into the through hole, by visual Oil leakage can be confirmed.

  In the present invention, the through hole may be provided so as to extend in the radial direction of the rod guide. In this case, since the through hole is the shortest, the back side of the through hole is easily visible, and a small amount of oil is required. Even leaks can be reliably grasped.

  Further, it is desirable that the opening end of the through hole on the outer surface side of the rod guide is always tightly plugged with a plug, thereby preventing foreign matter from entering the through hole.

  According to the oil damper according to the present invention, since the presence or absence of oil leakage can be reliably grasped by the vibration test, it greatly contributes to the improvement of the reliability with respect to the shipping inspection.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  1 and 2 show one embodiment of an oil damper according to the present invention. In the figure, reference numeral 1 denotes a main body. The main body 1 includes a cylinder 2 in which hydraulic oil is sealed, a piston 3 slidably housed in the cylinder 2, and an open end of the cylinder 2 from the piston 3. And a piston rod 6 that extends through the rod guides 4 and 5 provided to the outside of the cylinder. An attachment member 7 is provided at the tip of the piston rod 6 through which one rod guide 4 is inserted, and a cylinder 9 having an attachment member 8 at one end is connected to the other rod guide 5. This oil damper is applied as a brace damper for attenuating vibration of a building or the like. For example, a building damper 7 is attached to an end of the piston rod 6 and an attachment member 8 at one end of the cylindrical body 9. It is installed diagonally in the wall space.

  In the present embodiment, the piston rod 6 includes a main rod member 10 through which a rod guide 4 provided at one end opening end of the cylinder 2 is inserted, and a rod guide 5 provided at the other end opening end of the cylinder 2. It consists of a secondary rod member 11 to be inserted and an intermediate rod member 12 that connects the main rod member 10 and the secondary rod member 11. More specifically, the main rod member 10 has a proximal end side small-diameter portion 10 a inserted into the shaft hole 3 a of the piston 3 via a seal member 13. The intermediate rod member 12 has a cylindrical shape, and one end thereof is screwed to the distal end side of the small diameter portion 10 a of the main rod member 10. The piston 3 is fastened and fixed between the step surface of the main rod member 10 and the end surface of the intermediate rod member 12 by screwing the intermediate rod member 12 into the small-diameter portion 10a of the main rod member 10. The rod 6 and the piston 3 are integrated. On the other hand, the sub rod member 11 also has a cylindrical shape, and the tip portion thereof is screwed to the other end portion of the intermediate rod member 12. The most distal end portion of the small diameter portion 10 a of the main rod member 10 is smooth, and this smooth portion is inserted into the sub rod member 11 via the seal member 14.

  The cylinder 2 is divided into two chambers A and B by a piston 3, and hydraulic oil is sealed in the two chambers A and B. The piston 3 is formed with a plurality of first oil passages 15 and one second oil passage 16 communicating between the two chambers A and B. In the first oil passage 15, A pressure regulating valve 17 that generates a damping force due to the flow resistance of the hydraulic oil that accompanies the relative movement between the piston rod 6 (piston 3) and the cylinder 2 has a volume change caused by a change in the temperature of the hydraulic oil in the second oil passage 15. A pair of temperature compensation valves 18 and 19 for compensation are provided. The pressure regulating valve 17 includes an expansion side pressure regulating valve that generates a damping force when the piston rod 6 moves to the expansion side, and a compression side pressure regulating valve that generates a damping force when the piston rod 6 moves to the contraction side. Although there are types, only the compression side pressure regulating valve 17 is shown in FIGS.

  On the other hand, a free piston 20 is slidably disposed in the sub rod member 11 constituting the piston rod 6. Of the two chambers C and D in the sub rod member 11 defined by the free piston 20, one chamber C facing the end surface on the main rod member 10 side is connected to the small diameter portion 10 a of the main rod member 10 and the piston 3. It communicates with the second oil passage 16 in the piston 3 through a series of communication passages 21 formed, and hydraulic oil in the cylinder 2 is introduced into the chamber C. In the other chamber D in the sub rod member 11, a spring 22 that normally biases the free piston 20 toward the end face of the main piston member 10 is disposed. One chamber C in the sub rod member 11 is provided as a volume compensation chamber that compensates for a volume change due to a temperature change of the hydraulic oil, and the hydraulic oil in the chamber C passes through a free piston 20. A predetermined pressure corresponding to the spring force of the spring 22 is applied.

  Of the pair of temperature compensating valves 18 and 19, the left temperature compensating valve 18 is used when the volume of hydraulic oil in the left chamber A contracts or decreases when the piston rod 6 moves to the contraction side or stops. The valve is opened, and the hydraulic oil in the volume compensation chamber C is supplied to the left chamber A. In addition, the temperature compensation valve 18 on the left side allows the hydraulic oil in the left chamber A to pass through the throttle 18a when the volume of the left chamber A expands when the piston rod 6 moves to the extension side or stops. Return to C. On the other hand, the temperature compensation valve 19 on the right side opens when the volume of hydraulic oil in the right chamber B contracts or decreases when the piston rod 6 moves to the extension side or stops, and the volume compensation chamber C Supply hydraulic fluid to right chamber A. In addition, the right temperature compensation valve 19 allows the hydraulic oil in the right chamber A to pass through the throttle 19a when the volume of the right chamber A expands when the piston rod 6 moves to the contraction side or stops. Return to C.

  Here, between the main piston member 10 constituting the piston rod 6 and the one rod guide 4 and between the sub piston member 11 constituting the piston rod 6 and the other rod guide 5, each rod guide is provided. The oil seal 30 and the dust seal 31 attached to 4 and 5 are double-sealed. The oil seal 30 and the dust seal 31 are spaced apart from the inside and the outside of the cylinder 2, and the two chambers A and B in the cylinder 2 are maintained sealed by this double seal structure. Thus, each rod guide 4, 5 has one end opened on the inner peripheral surface located between the oil seal 30 and the dust seal 31, and the other end opened on the outer peripheral surface of each rod guide 4, 5. Each hole 32 is provided. Each through-hole 32 is linearly provided in the radial direction of the rod guides 4 and 5 here. In addition, a threaded portion 32a for sealing a plug (not shown) is formed at the opening end of each through hole 32 on the outer peripheral surface side of the rod guides 4 and 5.

  In the oil damper configured as described above, the pressure regulating valve 17 in the piston 3 is opened in response to the movement of the piston rod 6 (piston 3) to the expansion side or the contraction side, and the left chamber A in the cylinder 2 is opened. Hydraulic fluid flows through the first oil passage 23 between the right chamber B and the right chamber B, and during this time, a damping force on the expansion side or the contraction side is generated by the flow resistance of the hydraulic oil when passing through the pressure regulating valve 17. Therefore, when vibration is applied to the building during an earthquake, vibration energy is absorbed by the damping force generated by the pressure regulating valve 17 described above, thereby suppressing the vibration of the building. At this time, when a volume change occurs in the hydraulic oil due to a temperature change, oil leakage, etc., between the two chambers A and B in the cylinder 2 and the temperature compensation chamber C in the piston rod 6 through the pair of temperature compensation valves 18 and 19. In this way, the hydraulic oil is supplied and discharged, thereby compensating for the volume change of the hydraulic oil.

  By the way, the above-described oil damper is shipped after it is completed as a product as described above, and after performing a vibration test to confirm the performance, the presence or absence of oil leakage, and the like. In this vibration test, the oil damper is set in a testing machine so that the through holes 32 provided in the rod guides 4 and 5 face downward. By performing the vibration test with the oil damper set in this manner, if oil leaks from the oil seal 30 inside the cylinder, the dust seal 31 outside the cylinder restricts the flow in the direction along the piston rod 6. Therefore, the leaked oil flows into the through hole 32. The leaked oil in the through-hole 32 can be confirmed by visual observation. Therefore, the presence or absence of oil leakage can be reliably grasped at the stage of the vibration test before shipment, and the reliability for the shipment inspection is remarkably enhanced. .

  In addition to the above vibration test, by sending pressurized air from the outside to the through-hole 32, it is possible to inspect the leak from the dust seal 31 outside the cylinder, and the quality assurance as an oil damper is more reliable. . After the shipment inspection is completed, a plug is attached to the threaded portion 32a at the opening end of the through hole 32 before shipping, and foreign matter can be prevented from entering the through hole 32.

  Here, in the above embodiment, the through hole 32 is formed by extending the rod guides 4 and 5 in the radial direction. However, if the through hole is linear, the through holes 32 are extended in the inclined direction by the rod guides 4 and 5. It may be formed.

It is sectional drawing which shows the whole structure of the oil damper as one embodiment of this invention. It is sectional drawing which expands and shows a part of oil damper shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main-body part 2 Cylinder 3 Piston 4, 5 Rod guide 6 Piston rod 15, 16 Oil passage 17 Pressure regulation valve 18, 19 Temperature compensation valve 30 Oil seal 31 Dust seal 32 Through-hole

Claims (1)

A piston rod connected to a piston in a cylinder in which hydraulic oil is sealed is inserted through a rod guide provided at the opening end of the cylinder and extended out of the cylinder, so that the rod guide and the piston rod The oil seal and dust seal attached to the rod guide are spaced apart from each other inside and outside the cylinder, and the inner circumference located between the oil seal and the dust seal is located on the rod guide. A through hole provided in a linear shape with one end opened to the surface and the other end opened to the outer peripheral surface of the rod guide, and an oil damper manufacturing method comprising:
An oil damper comprising: an oscillating step of oscillating by setting the through hole of the oil damper in a vibration testing machine so as to face downward; and an attaching step of attaching a plug to the through hole. Manufacturing method .

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