JP4455481B2 - Hydraulic damper and inspection method thereof - Google Patents

Description

  The present invention relates to a hydraulic damper having two oil chambers separated by a piston in a cylinder and an inspection method thereof.

  As shown in FIG. 6, the conventional hydraulic damper 10 has two oil chambers 14 a and 14 b separated by a piston 12 in a cylinder 11. The cylinder 11 includes a cylindrical member 13 constituting the body portion, and closing members 32 and 33 formed in an end plate shape that closes both ends of the cylindrical member 13.

  A control valve 16 integrally connected to the accumulator 15 is provided on the upper side of the cylinder 11 in the figure, and oil oil is provided at both ends (not shown) of the damping throttle hole of the control valve 16. An oil passage 18 communicating with the chamber 14a and an oil passage 20 communicating with the oil chamber 14b communicate with each other. The oil passages 18 and 20 are formed so as to penetrate the thickness of the cylindrical member 13.

  In such a conventional hydraulic damper 10, the ball joint 24 connected to one end of the cylinder 11 via the connecting member 22 is fixed to one building structure (not shown), and the other end of the cylinder 11. A ball joint 28 provided at the end of the piston rod 26 that passes through the closing member 32 is fixed to the other building structure (not shown).

  When the distance between the one building structure and the other building structure changes due to, for example, an earthquake, the oil moves between the oil chambers 14a and 14b through the damping throttle hole of the control valve 16. By doing so, the hydraulic damper 10 performs a damping operation to absorb vibration energy (see, for example, Patent Document 1).

  As shown in FIG. 7, the conventional hydraulic damper 10 includes an O-ring 30 disposed so as to annularly surround a mating surface side end (upper end in the drawing) of the oil passage 20. The O-ring 30 prevents oil from leaking from the upper end of the oil passage 20 to the outside.

  Further, as shown in FIG. 6, an O-ring arranged so as to surround the upper end of the oil passage 18 in an annular shape is provided so as to seal between the valve 16 and the tubular member 13. This O-ring prevents oil from leaking from the upper end of the oil passage 18 to the outside.

  As shown in FIGS. 6 and 7, an O-ring 34 arranged in the circumferential direction around the end portion on the oil chamber 14 b side of the closing member 32 that closes the right end portion of the cylinder member 13 of the cylinder 11 in the drawing is provided. The O-ring 34 prevents oil from leaking from the oil chamber 14b and the oil passage 20 to the outside.

  An O-ring arranged in the circumferential direction also around the end on the oil chamber 14 a side of the closing member 33 that closes the left end in the figure of the cylinder member 13 of the cylinder 11 is formed between the closing member 33 and the cylindrical member 13. The O-ring prevents oil from leaking outside from the oil chamber 14a and the oil passage 18.

  Such a conventional hydraulic damper 10 is subjected to a performance test after its manufacture and before shipment from the factory. At this time, pressure is alternately applied to each of the oil chambers 14a and 14b, and the O-ring 30 and 34 confirms whether or not oil leakage has occurred outside the oil passages 18, 20 and the oil chambers 14 a, 14 b due to whether they are performing their intended functions or because they are defective. Inspection is also conducted.

  At this time, the oil leakage is checked by thoroughly wiping off the adhering oil to the external surface where the gap between the mating surfaces facing each other can be seen. This is done by spraying the powder and observing how much oil is sucked out from the gap by the powder.

  That is, the sucked powder is white, and when the oil is absorbed, the sucked powder where the oil has been absorbed turns dark and discolored, and the larger the discolored area, the more oil is sucked from the gap. It has come to understand that there are many.

As a method for inspecting oil leakage with such a sucked powder, for example, in the definition of “penetration flaw detection test method and penetration instruction pattern classification” according to standards such as JIS Z 2343, ISO 3452, etc., dry developer or fast dry development There is an inspection method using what is called an agent. Then, a white powder can be used as the suction powder, which is called a dry developer or a quick dry developer.
JP 2005-201383 A

  However, in the inspection method as described above, the oil sucked out by the sucked powder is the oil that has leaked out due to the oil leakage, or has been completely wiped off and remains attached to the original. Since it is very difficult to determine whether the oil is oil or not, there is a problem that the reliability of the inspection result has to be lowered.

  In view of the above problems, an object of the present invention is to provide a hydraulic damper and an inspection method thereof that can improve the reliability of the inspection result of oil leakage.

In order to solve the above problems, the present invention provides:
A hydraulic damper having two oil chambers separated by a piston in a cylinder,
A seal member is provided in the middle of the gap between the non-sliding mating surfaces that continue from the oil chamber to the outside,
An oil leakage detection agent is provided in the gap continuous from the seal member to the outside.

In order to solve the above problems, the present invention provides:
A hydraulic damper having two oil chambers separated by a piston in a cylinder,
A plurality of sealing members are provided at intervals in the middle of the gap between the mating surfaces that do not slide with each other from the oil chamber to the outside,
An oil leak detection agent is provided in the gap corresponding to the interval between the plurality of seal members.

  In the hydraulic damper according to the present invention, the oil leakage detecting agent has a property of being dissolved in oil and coloring the oil.

  Further, the oil leak detection agent in the hydraulic damper according to the present invention is characterized in that it has a different color depending on the location of the oil leak.

In order to solve the above problems, the present invention provides:
An inspection method for a hydraulic damper having two oil chambers separated by a piston in a cylinder,
In the hydraulic damper,
A seal member is provided in the middle of the gap between the non-sliding mating surfaces that continue from the oil chamber to the outside,
An oil leak detection agent is provided in the gap that continues from the seal member to the outside,
By detecting the oil leak detection agent at a location outside the gap, it is detected whether oil has leaked from the oil chamber to the outside through the gap.

In order to solve the above problems, the present invention provides:
An inspection method for a hydraulic damper having two oil chambers separated by a piston in a cylinder,
In the hydraulic damper,
A plurality of sealing members are provided at intervals in the middle of the gap between the mating surfaces that do not slide with each other from the oil chamber to the outside,
An oil leak detection agent is provided in the gap corresponding to the interval between the plurality of seal members,
By detecting the oil leak detection agent at a location outside the gap, it is detected whether oil has leaked from the oil chamber to the outside through the gap.

According to such a hydraulic damper of the present invention,
A hydraulic damper having two oil chambers separated by a piston in a cylinder,
A seal member is provided in the middle of the gap between the non-sliding mating surfaces that continue from the oil chamber to the outside,
By providing an oil leak detection agent in the gap that continues from the seal member to the outside,
The reliability of the inspection result of oil leakage can be improved.

Moreover, according to the hydraulic damper of the present invention,
A hydraulic damper having two oil chambers separated by a piston in a cylinder,
A plurality of sealing members are provided at intervals in the middle of the gap between the mating surfaces that do not slide with each other from the oil chamber to the outside,
By providing an oil leak detection agent in the gap corresponding to the interval between the plurality of seal members,
The reliability of the inspection result of oil leakage can be improved.

  In addition, since the oil leakage detecting agent in the hydraulic damper of the present invention has a property of being dissolved in oil and coloring the oil, it leaks to the outside together with the colored oil dissolved in the oil. Since it is sprayed and it is colored and oil leakage can be confirmed at a glance, the reliability of the inspection result of oil leakage can be improved.

  In addition, since the oil leak detection agent in the hydraulic damper of the present invention has a different color depending on the location of the oil leak, the location of the oil leak can be confirmed at a glance with the detected color, so the result of the oil leak inspection Reliability can be improved.

Moreover, according to the hydraulic damper of the present invention,
An inspection method for a hydraulic damper having two oil chambers separated by a piston in a cylinder,
In the hydraulic damper,
A seal member is provided in the middle of the gap between the non-sliding mating surfaces that continue from the oil chamber to the outside,
An oil leak detection agent is provided in the gap that continues from the seal member to the outside,
By detecting the oil leak detection agent at a location outside the gap, it is detected whether oil has leaked from the oil chamber to the outside through the gap.
The reliability of the inspection result of oil leakage can be improved.

Moreover, according to the hydraulic damper of the present invention,
An inspection method for a hydraulic damper having two oil chambers separated by a piston in a cylinder,
In the hydraulic damper,
A plurality of sealing members are provided at intervals in the middle of the gap between the mating surfaces that do not slide with each other from the oil chamber to the outside,
An oil leak detection agent is provided in the gap corresponding to the interval between the plurality of seal members,
By detecting the oil leak detection agent at a location outside the gap, it is detected whether oil has leaked from the oil chamber to the outside through the gap.
The reliability of the inspection result of oil leakage can be improved.

The best mode for carrying out the hydraulic damper and the inspection method thereof according to the present invention will be specifically described below with reference to the drawings.
FIG. 1 to FIG. 3 are views referred to for explaining a first embodiment of a hydraulic damper 40 and an inspection method thereof according to the present invention. The same parts as those of the conventional hydraulic damper 10 will be described using the same reference numerals, and redundant description of the same components will be omitted.

  In the conventional hydraulic damper 10, only one O-ring 30 is provided so as to surround each mating surface side end (upper end in the drawing) of each of the oil passages 20 and 18, whereas FIG. As shown in FIG. 2, in the hydraulic damper 40 according to the present embodiment, an O-ring 30 (seal member) that surrounds the mating surface side ends of the oil passages 20 and 18, is arranged concentrically outside the radius. The difference is that another O-ring 31 (seal member) is provided.

  In the conventional hydraulic damper 10, only one O-ring 34 is provided between each of the closing members 32, 33 at both ends of the cylinder 11 and the cylindrical member 13. In the hydraulic damper 40 according to the embodiment, as shown in FIGS. 1 and 2, in addition to the O-ring 34 (sealing member) between the closing members 32 and 33 and the tubular member 13, the hydraulic damper 40 is in parallel therewith. The difference is that another O-ring 35 (seal member) is provided side by side.

  Further, as shown in FIG. 3, there is a gap C between the corresponding mating surfaces (contact surfaces) of the outer member of the control valve 16 and the cylindrical member 13 of the cylinder 11. In the present embodiment, a detection agent 42 that dissolves in oil and colors the oil is provided in the gap C between the O-rings 30 and 31 by coating or the like. As the detection agent 42 for coloring such oil, for example, a permeation liquid called a dye permeation liquid defined by the standards such as JIS Z 2343 and ISO 3452 can be used.

  As a method for inspecting oil leakage of the hydraulic damper 40 according to the present embodiment as described above, when performing a performance test after manufacturing and before shipping from a factory, for example, as shown in FIG. It is inspected whether oil has oozed out from a portion Q1 where the gap C between the mating surfaces corresponding to each other of the cylinder 16 and the cylindrical member 13 is visible from the outside.

  At this time, the oil adhering to the hydraulic damper 40 in the vicinity of the portion Q1 is thoroughly wiped off, and then the sucked powder is sprayed there. Since it appears, oil leakage can be confirmed by visually checking the streak of this color.

  As the suction powder, the suction powder described in the description of the conventional hydraulic damper 10, that is, a white powder called a dry developer or a quick-dry developer as defined in the standards of JIS Z 2343, ISO 3452, etc. is used. be able to.

  By the way, it goes without saying that both the O-rings 30 and 31 are free of defects, and when only one of the O-rings 30 and 31 is defective and the other is free of defects, the colored detection agent 42 is used. It does not flow out to the location Q1. Here, when there is a defect, there is a defect in the shape and quality unique to the O-ring, and even if there is no such defect unique to the O-ring, its function due to its mounting method, mounting state, etc. It shall include any case where there is a defect.

  When both the O-rings 30 and 31 are defective, the oil leaking from the oil passage 20 flows in the direction of arrow E in FIG. 3 and passes through the O-ring 30 and encounters the colored detection agent 42. The colored detection agent 42 is dissolved in the leaked oil and flows together in the same direction, passes through the O-ring 31, and oozes out from the portion Q1 where the gap C is visible from the outside.

  At this time, since the leaked oil that oozes out from the portion Q1 is mixed with the colored detection agent 42 and is colored, when the white suction powder is sprayed, the suction powder is immediately colored in the color of the detection agent 42. Since it appears as a color streak, oil leakage can be confirmed at a glance.

  The detection agent shown in FIG. 3 is dissolved in oil in a gap C between two O-rings 34 and 35 provided in parallel with each other in the circumferential direction around the closing member 32 shown in FIG. A detection agent for coloring oil in a color different from 42 is provided by coating or the like. For this reason, when both the O-rings 34 and 35 are defective, the oil leaking from the oil passage 20 and the oil chamber 14b is colored by the detection agent 42 being melted and then colored, as shown in FIG. And the gap C between the mating surfaces corresponding to each other of the closing member 32 ooze out from the portion Q2 visible from the outside. Then, the leaked and colored oil colors the sprayed white sucking powder and appears as color streaks, so that oil leakage can be confirmed at a glance.

  According to the hydraulic damper 40 according to this embodiment, the oil that leaks and is colored causes the white sucked powder that has been sprayed to appear as color streaks. Since it can be confirmed, it is possible to confirm at a glance whether it is oil that remains and adheres or oil that leaks. For this reason, the reliability of the inspection result of oil leakage can be improved. Moreover, it can be immediately confirmed from which O-ring the oil leak has occurred by looking at the color.

  In addition, according to the hydraulic damper 40 according to the present embodiment, it can be confirmed that the oil leaks if the oil is colored even in a small amount, and therefore the inspection time for the oil leak can be shortened. In other words, in the past, it was determined that the amount of the range in which the sucked powder absorbed the oil related to the oil leak and became darkened and discolored, that is, the amount of the oil related to the oil leak, was not passed. However, according to the present embodiment, it is not necessary to wait for the passage of time as in the prior art, so that the inspection time for oil leakage can be shortened as described above.

  4 and 5 are views referred to for explaining a hydraulic damper and an inspection method thereof according to the second embodiment of the present invention.

  In the hydraulic damper 40 according to the first embodiment, two O-rings 30 and 31 are provided concentrically around the mating face side ends (upper ends in the drawing) of the oil passages 20 and 18, respectively. In the hydraulic damper according to the second embodiment, two O-rings 34 and 35 are provided around the closing members 32 and 33 in parallel in the circumferential direction. 4, one O-ring 30 (seal member) is provided around the upper end of the oil passage 20, and one O-ring 34 (seal member) is provided in the circumferential direction around the closing member 32. ) Is different. The same applies to the O-ring (seal member) around the oil passage 18 and the closing member 33.

  Then, as shown in FIG. 5, in the gap C between the mating surfaces corresponding to each other between the outer member of the control valve 16 and the cylinder member 13 of the cylinder 11, the O-ring of the gap C continuous from the O-ring 30 to the outside. In the vicinity of 30, a detection agent 42 that dissolves in oil and colors the oil is provided by coating or the like.

  Even with such a hydraulic damper according to the second embodiment of the present invention, the oil leaked and colored appears as a color streak by coloring the sprayed white sucking powder. Since the oil leakage can be confirmed, it is possible to confirm at a glance whether the oil remains and adheres or the oil related to the oil leakage. For this reason, the reliability of the inspection result of oil leakage can be improved.

In the above embodiment, the case where the O-ring is used as the seal member has been described. However, any type of seal member other than the O-ring may be used.
In the above embodiment, the case where the present invention is applied to the vibration damper is described. However, the present invention can be applied to any other type of hydraulic damper.

  Further, in the above-described embodiment, the case where the present invention is applied at the time of inspection before shipment is described, but it is not necessary to limit it before shipment, and at the time of inspection before installation on the site after shipment, or after building the building Needless to say, the present invention can be applied at the time of inspection after one year has passed and at any other time of inspection.

  For example, the inspection before installation at the site after shipment is performed in the same procedure as the inspection before shipment. Since it can be proved (confirmed) at a glance in a short time, the customer can be relieved and trouble can be prevented. Even if there is an oil leak, it is possible to quickly take an appropriate treatment.

  In the above embodiment, a colored detection agent is used. However, it is not necessary to limit to a normal color, and a fluorescent color may be used, or any property or characteristic other than the color is used. May be. For example, a detection agent that can be detected by component analysis may be provided in the gap C.

It is sectional drawing which shows the hydraulic damper 40 which concerns on the 1st Embodiment of this invention. It is a partial expanded sectional view of the hydraulic damper 40 in FIG. FIG. 3 is an enlarged cross-sectional view around O-rings 30 and 31 in FIG. 2. It is a partial expanded sectional view of the hydraulic damper which concerns on the 2nd Embodiment of this invention. FIG. 5 is an enlarged cross-sectional view around the O-ring 30 in FIG. 4. 1 is a cross-sectional view showing a conventional hydraulic damper 10. FIG. It is a partial expanded sectional view of the hydraulic damper 10 in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hydraulic damper 11 Cylinder 12 Piston 13 Cylindrical member 14a Oil chamber 14b Oil chamber 15 Accumulator 16 Control valve 18 Oil path 20 Oil path 22 Connecting member 24 Ball joint 28 Ball joint 26 Piston rod 30 O-ring 31 O-ring 32 Closing member 33 Closing member 34 O-ring 35 O-ring 40 Hydraulic damper 42 Colored detection agent

Claims (6)

A hydraulic damper having two oil chambers separated by a piston in a cylinder,
A seal member is provided in the middle of the gap between the non-sliding mating surfaces that continue from the oil chamber to the outside,
A hydraulic damper, wherein an oil leakage detection agent is provided in the gap that continues from the seal member to the outside. A hydraulic damper having two oil chambers separated by a piston in a cylinder,
A plurality of sealing members are provided at intervals in the middle of the gap between the mating surfaces that do not slide with each other from the oil chamber to the outside,
An oil damper is provided in the gap corresponding to the interval between the plurality of seal members.   The hydraulic damper according to claim 1 or 2, wherein the oil leakage detecting agent has a property of being dissolved in oil and coloring the oil.   4. The hydraulic damper according to claim 3, wherein the oil leak detection agent has a different color depending on the location of the oil leak. An inspection method for a hydraulic damper having two oil chambers separated by a piston in a cylinder,
In the hydraulic damper,
A seal member is provided in the middle of the gap between the non-sliding mating surfaces that continue from the oil chamber to the outside,
An oil leak detection agent is provided in the gap that continues from the seal member to the outside,
By detecting the oil leakage detection agent at a location outside the gap, it is detected whether oil has leaked from the oil chamber to the outside through the gap. Inspection method. An inspection method for a hydraulic damper having two oil chambers separated by a piston in a cylinder,
In the hydraulic damper,
A plurality of sealing members are provided at intervals in the middle of the gap between the mating surfaces that do not slide with each other from the oil chamber to the outside,
An oil leak detection agent is provided in the gap corresponding to the interval between the plurality of seal members,
By detecting the oil leakage detection agent at a location outside the gap, it is detected whether oil has leaked from the oil chamber to the outside through the gap. Inspection method.

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