JP2013072469A - Hydraulic damper and oil-level monitoring method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration-control hydraulic damper that allows a worker to easily recognize a change in the amount of hydraulic fluid in the vibration-control hydraulic damper from the outside without looking into a through-hole of an extension member, and an oil-level monitoring method for the same.SOLUTION: A hydraulic damper includes: a cylinder 42; a piston 50; oil chambers 56, 58 in the cylinder 42; an accumulator 72 provided in the piston rod 54 of the piston 50 and having an oil chamber 76 communicating with the oil chambers 56, 58; a rod-like member 82 whose amount of projection to the outside is increased/reduced according to the pressure fluctuation of the hydraulic fluid in the cylinder 42; an extension member 84 covering the accumulator 72; and an oil-level monitoring rod member 86 inserted into a through-hole 84b formed in the extension member 84. It is configured to determine the amount of hydraulic fluid of the whole damper 40 by the length dimension of the oil-level monitoring rod member 86, inserted into the extension member 84, when the oil-level monitoring rod member 86 is inserted into the through-hole 84b.

Description

  The present invention relates to a hydraulic damper that is attached to a structure such as a building and used to absorb the displacement between positions of the structure due to an external force such as an earthquake, and an oil amount monitoring method thereof. is there.

  In the conventional hydraulic damper, for example, as shown in FIG. 13, there is a hydraulic damper 2 for damping that is used to absorb the displacement between positions of the structure due to an external force such as an earthquake to suppress the vibration. .

  The conventional hydraulic damper 2 includes a cylindrical cylinder 4 closed at both ends, and a space formed inside the cylinder 4 and formed in the cylinder 4 into two spaces. Piston 6 which forms the two oil chambers 8 and 10 with which hydraulic oil was filled in the space in the both sides was provided.

  This piston 6 has two piston rods 12 and 14 extending from the both end faces 6a and 6b to the outside in the axial direction (left and right direction in FIG. 13), and these piston rods 12 and 14 are cylinders. Each end portion protruded outward in the axial direction from both end faces 4a and 4b. And the front-end | tip part of the piston rod 14 was accommodated in the internal space of the extension member 16 extended to the outer side of the axial direction from the end surface 4b of the cylinder 4. As shown in FIG.

  The conventional hydraulic damper 2 has a fluid state of the hydraulic oil between the oil chambers 8 and 10 in the middle of the oil passages 6c and 6d communicating between the oil chambers 8 and 10 inside the piston 6. Relief valves 18 and 20 to be controlled were provided. The internal space of the piston rod 14 of the piston 6 was provided with an accumulator 22 that absorbs expansion and contraction of the hydraulic oil in the oil chambers 8 and 10 to operate the hydraulic damper 2 stably.

  The accumulator 22 includes an accumulator piston 26 that divides the internal space of the piston rod 14 into two spaces, and an accumulator oil chamber 24 that is formed in one of the two spaces and communicates with the two oil chambers 8 and 10 in the cylinder 4. And a spring 28 that is housed in the other of the two spaces and presses the accumulator piston 26 toward the accumulator oil chamber 24, and a base end portion of the accumulator piston 26 is integrally formed at the axial line portion thereof, This portion is constituted by a rod-shaped member 30 that protrudes outside from the tip surface 14b of the piston rod 14 through the shaft hole 14a at the tip of the piston rod 14.

  The amount of hydraulic oil in the oil chambers 8 and 10 in the cylinder 4 is the tip of the rod-shaped member 30 protruding outside from the tip of the piston rod 14 via the hydraulic oil in the accumulator oil chamber 24 of the accumulator 22. Can be monitored by a change in the projecting length dimension (see FIG. 3 of Patent Document 1).

  In order to make it possible to visually recognize changes in the protruding length of the tip of the rod-shaped member 30 protruding outward from the tip of the piston rod 14, the extension member 16 has a protruding length of the tip of the rod-shaped member 30 inside. A through hole 16a for peeping was formed.

  According to such a conventional hydraulic damper 2, the protrusion length dimension of the distal end portion of the rod-shaped member 30 projecting outside from the distal end portion of the piston rod 14 when the operator looks into the through hole 16 a of the extension member 16. The change in the amount of hydraulic oil in the first oil chamber 18 and the second oil chamber 20 can be recognized from the outside via the hydraulic oil in the accumulator oil chamber 24. It was supposed to be.

JP 2003-269005 A

  However, in the conventional hydraulic damper 2, the operator looks into the through hole 16 a of the extension member 16 to visually recognize the change in the protruding length of the tip of the rod-shaped member 30. There is a problem that the visual work is complicated and labor, time and cost are required.

  Further, in order to make it easy to visually recognize the change in the protruding length dimension of the distal end portion of the rod-shaped member 30, it is conceivable to increase the opening area of the through hole 16a of the extension member 16, but if so, the strength of the extension member 16 is increased. If the installation location of the hydraulic damper 2 is outdoors, it is necessary to take measures to prevent the intrusion of rainwater, which requires labor, time and cost. It was.

  Accordingly, in view of the above problems, the present invention provides a hydraulic damper that can easily recognize a change in the amount of hydraulic oil in the hydraulic damper from the outside without an operator looking into the through hole of the extension member. It is an object of the present invention to provide an oil amount monitoring method.

In order to solve the above-described problem, a hydraulic damper according to the present invention includes:
A cylinder,
A piston housed in the cylinder;
Two oil chambers formed on both sides of the piston in the cylinder;
An accumulator provided on a piston rod protruding outward from the cylinder of the piston, and having an oil chamber communicating with the two oil chambers;
A rod-like member that increases or decreases in an amount protruding outward from the accumulator in accordance with a change in pressure of hydraulic oil in the cylinder;
An extension member extending from the cylinder in its length direction and covering the periphery of the accumulator;
An oil amount monitoring rod member inserted into a through hole formed in the extension member,
When the oil amount monitoring rod member is inserted into the through-hole, the change in the amount of hydraulic oil in the entire damper can be determined based on the length of the oil amount monitoring rod member inserted into the extension member. It is characterized by that.

The hydraulic damper according to the present invention is
A tapered surface is formed at the tip of the rod-shaped member,
The oil amount monitoring rod member is formed with a tapered surface that can slide in contact with the tapered surface of the distal end portion of the rod-shaped member.

The hydraulic damper according to the present invention is
The oil amount monitoring rod member whose lower end is inserted into the through hole of the extension member is formed with a locking portion that is locked to the outer peripheral surface of the extension member. .

The hydraulic damper according to the present invention is
The oil amount monitoring rod member, whose lower end is inserted into the through hole of the extension member, is supported by an elastic member such that the end surface of the lower end is disposed radially outside the outer peripheral surface of the accumulator. It is characterized by that.

The hydraulic damper according to the present invention is
A guide portion that protrudes in the radial direction from one or both of the inner and outer peripheral surfaces of the extension member is formed around the through hole of the extension member.

In addition, in order to solve the above-described problem, an oil amount monitoring method for a hydraulic damper according to the present invention includes:
A cylinder,
A piston housed in the cylinder;
Two oil chambers formed on both sides of the piston in the cylinder;
An accumulator provided on a piston rod protruding outward from the cylinder of the piston, and having an oil chamber communicating with the two oil chambers;
A rod-like member that increases or decreases in an amount protruding outward from the accumulator in accordance with a change in pressure of hydraulic oil in the cylinder;
An extension member extending from the cylinder in its length direction and covering the periphery of the accumulator;
An oil amount monitoring method for a hydraulic damper comprising an oil amount monitoring rod member inserted through a through hole formed in the extension member,
The oil amount monitoring rod member is inserted into the through hole, and the change in the amount of hydraulic oil in the entire damper is determined based on the length of the oil amount monitoring rod member inserted into the extension member. It is characterized by that.

According to such a hydraulic damper of the present invention,
A cylinder,
A piston housed in the cylinder;
Two oil chambers formed on both sides of the piston in the cylinder;
An accumulator provided on a piston rod protruding outward from the cylinder of the piston, and having an oil chamber communicating with the two oil chambers;
A rod-like member that increases or decreases in an amount protruding outward from the accumulator in accordance with a change in pressure of hydraulic oil in the cylinder;
An extension member extending from the cylinder in its length direction and covering the periphery of the accumulator;
An oil amount monitoring rod member inserted into a through hole formed in the extension member,
When the oil amount monitoring rod member is inserted into the through-hole, the change in the amount of hydraulic oil in the entire damper can be determined based on the length of the oil amount monitoring rod member inserted into the extension member. By doing
Even if the operator does not look into the through hole of the extension member, a change in the amount of hydraulic oil in the hydraulic damper can be easily recognized from the outside.

Moreover, according to the oil amount monitoring method of the hydraulic damper of the present invention,
A cylinder,
A piston housed in the cylinder;
Two oil chambers formed on both sides of the piston in the cylinder;
An accumulator provided on a piston rod protruding outward from the cylinder of the piston, and having an oil chamber communicating with the two oil chambers;
A rod-like member that increases or decreases in an amount protruding outward from the accumulator in accordance with a change in pressure of hydraulic oil in the cylinder;
An extension member extending from the cylinder in its length direction and covering the periphery of the accumulator;
An oil amount monitoring method for a hydraulic damper comprising an oil amount monitoring rod member inserted through a through hole formed in the extension member,
The oil amount monitoring rod member is inserted into the through hole, and the change in the amount of hydraulic oil in the entire damper is determined based on the length of the oil amount monitoring rod member inserted into the extension member. By doing
Even if the operator does not look into the through hole of the extension member, a change in the amount of hydraulic oil in the hydraulic damper can be easily recognized from the outside.

It is sectional drawing which shows the hydraulic damper 40 which concerns on the 1st Embodiment of this invention along the axis line. It is a partial expanded sectional view which expands and shows the pressurization type accumulator 72 shown in FIG. 1, and its vicinity. 7 is a partially enlarged cross-sectional view showing a state when the oil amount monitoring rod member 86 is inserted into the through hole 84a of the extension member 84 when the amount of hydraulic oil in the cylinder 42 is larger than the lower limit value. FIG. 7 is a partially enlarged cross-sectional view showing a state when the oil amount monitoring rod member 86 is inserted into the through hole 84a of the extension member 84 when the amount of hydraulic oil in the cylinder 42 is less than the lower limit value. FIG. In the hydraulic damper 90 according to the second embodiment of the present invention, when the amount of hydraulic oil in the cylinder 42 is larger than the lower limit value, the oil amount monitoring rod member 94 is inserted into the through hole 84a of the extension member 84. It is a partial expanded sectional view which shows the state. In the hydraulic damper 90 according to the second embodiment of the present invention, when the amount of hydraulic oil in the cylinder 42 is less than the lower limit value, the oil amount monitoring rod member 94 is inserted into the through hole 84a of the extension member 84. It is a partial expanded sectional view which shows the state. In the hydraulic damper 100 according to the third embodiment of the present invention, a portion mainly including the rod-shaped member 82 and the oil amount monitoring rod member 102, showing a case where the amount of the entire hydraulic oil in the cylinder 42 is larger than the lower limit value. It is an expanded sectional view. A portion mainly including a rod-shaped member 82 and an oil amount monitoring rod member 102 in the hydraulic damper 100 according to the third embodiment of the present invention, showing a case where the amount of the entire hydraulic oil in the cylinder 42 is less than the lower limit value. It is an expanded sectional view. It is a partial expanded sectional view which expands and shows the pressurization type accumulator 72 and its vicinity in the hydraulic damper 110 which concerns on the 4th Embodiment of this invention. FIG. 6 is a partial enlarged cross-sectional view showing a state when the oil amount monitoring rod member 112 is pushed into the through hole 84a of the extension member 84 when the total amount of hydraulic oil in the cylinder 42 is larger than the lower limit value. 7 is a partially enlarged cross-sectional view showing a state when the oil amount monitoring rod member 112 is pushed into the through hole 84a of the extension member 84 when the amount of the entire hydraulic oil in the cylinder 42 is less than the lower limit value. FIG. It is a partial expanded sectional view which expands and shows the pressurization type accumulator 72 and its vicinity in the hydraulic damper 120 which concerns on the 5th Embodiment of this invention. It is sectional drawing which shows the conventional hydraulic damper 2 along the axis line.

  Hereinafter, the form for implementing the hydraulic damper concerning the present invention is explained concretely based on a drawing.

  FIGS. 1 to 4 are views referred to for explaining a hydraulic damper 40 for vibration control according to the first embodiment of the present invention.

As shown in FIG. 1, the hydraulic damper 40 according to the present embodiment is a cylinder composed of a cylindrical cylinder body 44 and a pair of cover members 46 and 48 that close both ends of the cylinder body 44 in the axial direction. 42, and a piston 50 is accommodated inside the cylinder 42.

  The piston 50 is formed in a short cylindrical shape having an axis extending in the left-right direction in the drawing, and its outer peripheral portion slides on the inner peripheral surface of the cylinder body 44 so that it can move in the axial direction. Housed in the cylinder 42.

  And the cylinder 42 has the 1st oil chamber 56 and the 2nd oil chamber 58 which were divided in the inside by the piston 50 in the inside, These 1st oil chamber 56 and the 2nd oil chamber 58 of The inside is filled with hydraulic oil.

  The piston 50 includes a first piston rod 52 having a round bar shape extending in the axial direction from the center of the right end face in the drawing and protruding outward (right side in the drawing) from the cover member 46 of the cylinder 42, and the piston 50. The second piston rod portion in the form of a round bar that extends in the axial direction from the center of the end surface opposite to the first piston rod portion 52 (left side in the drawing) and protrudes outward (left side in the drawing) from the cover member 48 of the cylinder 42. 54 is integrally formed.

  As shown in FIG. 1, the first piston rod portion 52 is slidably fitted into a fitting hole 46 a formed in the cover member 46 of the cylinder 42 while maintaining a sealed state in the first oil chamber 56. The tip of the cover member 46 protrudes outward in the axial direction from the cover member 46.

  The second piston rod portion 54 is slidably fitted in a fitting hole 48a formed in the cover member 48 of the cylinder 42 while maintaining a sealed state in the second oil chamber 58, and the cover The tip of the member 48 protrudes outward in the axial direction from the member 48, and a pressure accumulator 72 is connected in series in the axial direction to the tip that protrudes outward.

  And the right end part in the figure of the cylindrical extension member 84 with which the left end part in the figure was closed is integrally connected with the outer peripheral part of the cover member 48 of the cylinder 42. The extension member 84 accommodates therein a tip end portion that protrudes outward from the cover member 48 in the axial direction of the second piston rod portion 54 and a pressure accumulator 72, and the extension member 84 is the same as the axis line of the cylinder 42. It is provided to extend its length in the direction.

  In the solid interior of the piston 50, flow paths 60 and 62 communicating between the first oil chamber 56 and the second oil chamber 58 are formed in a direction parallel to the axis of the piston 50. Relief valves 64 and 66 (pressure regulating valves) are arranged in the middle of these flow paths 60 and 62 so as to operate in opposite directions.

  These relief valves 64 and 66 have a function of closing the cross sections of the flow paths 60 and 62 so that hydraulic oil does not flow inside when the hydraulic damper 40 in which the piston 50 does not move in the axial direction in the cylinder 42 is not operated. However, during the operation of the hydraulic damper 40 in which the piston 50 moves in the axial direction in the cylinder 42 due to an earthquake or the like, the hydraulic oil in one of the first oil chamber 56 and the second oil chamber 58 is operated. If the pressure exceeds a certain value, one of the flow paths 60 and 62 is opened to allow the hydraulic oil to flow from one oil chamber to the other oil chamber.

  Further, in the solid interior of the piston 50, flow paths 68 and 70 are formed to communicate the first oil chamber 56 and the second oil chamber 58 in the cylinder 42 and the accumulator oil chamber 76 of the pressurization type accumulator 72. Yes. And the inside of the accumulator oil chamber 76 of the flow path 68 and 70 in the piston 50 and the pressurization type accumulator 72 is filled with hydraulic oil.

  A throttle (hydraulic pressure reducing means) such as an orifice (not shown) is provided in the middle of each of the two flow paths 68 and 68 in the length direction. This hydraulic pressure reducing means is provided with the flow path 70 and the accumulator oil chamber 76 from the first oil chamber 56 and the second oil chamber 58 side when the hydraulic damper 40 in which the piston 50 moves in the axial direction in the cylinder 22 due to an earthquake or the like. The flow rate of the hydraulic oil to the first oil chamber 56 and the second oil chamber 58 is reduced by restricting the flow rate of the hydraulic oil to the accumulator oil chamber 76.

  The pressurization type accumulator 72 includes a cylindrical accumulator body 74 and an accumulator piston 78 that divides one space formed in the accumulator body 74 into two spaces.

  The pressurization type accumulator 72 is further accommodated in the accumulator oil chamber 76 formed in one of the two spaces divided by the accumulator piston 78 and the other of the two spaces, and the accumulator piston 78 is stored in the accumulator oil chamber 76. A spring 80 (elastic member) that presses toward the end, and a base end portion thereof is integrally formed with the axial portion of the accumulator piston 78, and a tip end portion thereof passes through the shaft hole at the left end portion of the accumulator main body 74 in the drawing. And a round bar-like member 82 protruding outward from the accumulator body 74.

  The pressurization type accumulator 72 has a function of absorbing expansion and contraction of hydraulic oil in the first oil chamber 56 and the second oil chamber 58 in the cylinder 42.

  For example, when the piston 50 moves in the axial direction in the cylinder 42 and the pressure of the hydraulic oil in one of the first oil chamber 56 and the second oil chamber 58 decreases, the pressure decreases. By supplying the hydraulic oil from the accumulator oil chamber 76 to the oil chamber, it is possible to prevent the hydraulic oil from running short and the first oil chamber 56 and the second oil chamber 58 to become negative pressure. Can be stabilized.

  The pressurization accumulator 72 also has a function as a reserve tank for hydraulic oil. When the amount of hydraulic oil in the first oil chamber 56 or the second oil chamber 58 is insufficient due to oil leakage or the like, The hydraulic oil can be supplied from the accumulator oil chamber 76 to the oil chambers 56 and 58.

  The hydraulic damper 40 according to the present embodiment leaks hydraulic oil from the first oil chamber 56, the second oil chamber 58, or the accumulator oil chamber 76 in the cylinder 42 after a long period of time, When the amount of hydraulic oil decreases, the amount of hydraulic oil in the accumulator oil chamber 76 that supplies the hydraulic oil to these oil chambers 56 and 58 decreases.

  As shown in FIG. 2, when the amount of hydraulic oil in the accumulator oil chamber 76 decreases, the pressurization type accumulator 72 is pressed against the spring 80 because the spring 80 that presses the accumulator piston 78 toward the accumulator oil chamber 76 extends. The accumulator piston 78 and the rod-shaped member 82 are moved in the direction of arrow A (right direction in the figure).

  For this reason, when the amount of hydraulic oil in the accumulator oil chamber 76 decreases, the protruding length dimension of the tip end surface 82a of the rod-like member 82 protruding from the end surface 74a of the accumulator main body 74 is shortened accordingly. .

  Here, the accumulator in the case where the cylinder 42 is filled with a minimum amount of hydraulic oil (hereinafter referred to as a lower limit value) necessary for the hydraulic damper 40 according to the present embodiment to perform its original function. Let L be the protruding length dimension from the end surface 74a of the main body 74 to the tip end surface 82a of the rod-shaped member 82.

  As shown in FIG. 2, the extending member 84 is formed with a circular through hole 84a. The through hole 84a has an edge portion 84b (right end portion in the figure) near the pressurization type accumulator 72 at substantially the same position as the tip end surface 82a (tip end portion) of the rod-shaped member 82 when the amount of hydraulic oil is the lower limit value. It is arranged to be.

  Further, as shown in FIG. 3, the through hole 84a of the extension member 84 is slidable in the vertical direction in the figure by inserting a round bar-shaped oil amount monitoring rod member 86 having an outer diameter substantially the same as the inner diameter thereof. It is formed so that it can be fitted. The oil amount monitoring rod member 86 is provided with a mark 86b on the periphery of a cross section (horizontal plane in the figure) perpendicular to the axial direction (vertical direction in the figure).

  Based on FIG.3 and FIG.4, the oil amount monitoring method of the hydraulic damper 40 which concerns on the 1st Embodiment of this invention is demonstrated.

  First, FIG. 3 shows that the amount of hydraulic oil filled in the first oil chamber 56, the second oil chamber 58, and the accumulator oil chamber 76 in the cylinder 42 in FIG. FIG. 6 is a view showing a protruding state of a tip end portion of a rod-shaped member 82 when the hydraulic damper 40 that does not move in the axial direction in the cylinder 42 is inactive.

  That is, the protrusion length dimension L1 of the tip end surface 82a of the rod-like member 82 from the end face 74a of the accumulator main body 74 is the protrusion length dimension L when the amount of hydraulic oil as shown in FIG. Is bigger than.

  For this reason, when the oil amount monitoring rod member 86 is inserted into the through hole 84a of the extension member 84, the distal end surface 86a of the lower end portion of the oil amount monitoring rod member 86 in the figure is the outer peripheral surface 82b of the distal end portion of the rod-shaped member 82. It comes to contact with.

  Therefore, after the front end surface 86a of the oil amount monitoring rod member 86 comes into contact with the outer peripheral surface 82b of the rod-shaped member 82, the oil amount monitoring rod member 86 cannot be inserted deeper into the extension member 84. It has become.

  At this time, the mark 86b provided on the peripheral portion of the cross section perpendicular to the axial direction of the oil amount monitoring rod member 86 is arranged on the outer side of the outer peripheral surface 84c of the extension member 84, so that it can be easily applied from the outside. The mark 86b can be confirmed.

  As described above, when the amount of the working oil filled in the first oil chamber 56, the second oil chamber 58, and the accumulator oil chamber 76 in the cylinder 42 is larger than the lower limit value, the inserted oil Since the tip end face 86a of the amount monitoring rod member 86 is in contact with the rod-shaped member 82, the length of the oil amount monitoring rod member 86 inserted into the extension member 84 is constant, and the mark 86b is visually recognized. Thus, it can be confirmed that the amount of hydraulic oil in the cylinder 42 is larger than the amount in the case of the lower limit value.

  Next, FIG. 4 shows that the amount of hydraulic oil filled in the first oil chamber 56, the second oil chamber 58, and the accumulator oil chamber 76 in the cylinder 42 in FIG. FIG. 5 is a view showing a protruding state of a tip end portion of a rod-shaped member 82 when a hydraulic damper 40 in which 50 does not move in the axial direction in a cylinder 42 is inactive.

  That is, the protrusion length dimension L2 of the tip end surface 82a of the rod-like member 82 from the end face 74a of the accumulator main body 74 is the protrusion length dimension L when the amount of hydraulic oil as shown in FIG. Is smaller than

  For this reason, when the oil amount monitoring rod member 86 is inserted into the through hole 84a of the extension member 84, the distal end surface 86a of the lower end portion of the oil amount monitoring rod member 86 in the figure is the outer peripheral surface 82b of the distal end portion of the rod-shaped member 82. Does not come into contact.

  Therefore, the tip end surface 86a of the oil amount monitoring rod member 86 does not contact the rod-shaped member 82, so that the oil amount monitoring rod member 86 is inserted deeper into the extension member 84 than in the case of FIG. Be able to.

  For this reason, since the mark 86b provided on the oil amount monitoring rod member 86 enters inside the outer peripheral surface 86c of the extension member 84, the mark 86b cannot be visually recognized from the outside.

  As described above, in the hydraulic damper 40 according to the present embodiment, the oil amount monitoring rod member 86 is disposed inside the extension member 84 when the amount of hydraulic oil in the cylinder 42 is larger than the lower limit value and when it is smaller than the lower limit value. The length dimension inserted into is different.

  Therefore, in the hydraulic damper 40, the oil amount monitoring rod member 86 is inserted into the through hole 84a of the extension member 84, the tip end surface 86a abuts on the rod-like member 82, and the mark 86b is a position outside the extension member 84. It is possible to easily recognize from the outside whether the hydraulic damper 40 has a sufficient amount of oil to exhibit its original function.

  Further, unlike the conventional hydraulic damper 2, the hydraulic damper 40 does not require an operator to look into the through-hole 16a of the extension member 16, so that the hydraulic damper 40 has sufficient oil to perform its original function. It can be easily recognized from the outside whether it has a quantity.

  Further, since the hydraulic damper 40 does not have to have a large opening area in which the through-hole 84a of the extension member 84 can be easily visually recognized, the conventional hydraulic damper described above. 2, the opening area of the through hole 84 a of the extension member 84 can be made smaller than the through hole 16 a of the extension member 16.

  Thus, since the opening area of the through hole 84a of the extension member 84 can be reduced, the strength of the extension member 84 can be prevented from being reduced, and the processing of the through hole 84a is facilitated. It is also possible to easily take measures for preventing rainwater from entering 84a.

  According to the hydraulic damper 40 according to the first embodiment of the present invention, the amount of hydraulic oil in the hydraulic damper 40 can be changed without the operator looking into the through hole 84a of the extension member 84. It can be easily recognized from the outside.

  FIG. 5 and FIG. 6 are diagrams which are referred to in order to explain a vibration-damping hydraulic damper 90 according to the second embodiment of the present invention.

  As shown in FIG. 5, the rod-shaped member 92 in the hydraulic damper 90 according to the present embodiment has a conical end portion protruding from the end surface 74a of the accumulator body 74, that is, toward the tip end 92a of the end portion. This is different from the rod-like member 82 in the first embodiment in that the tapered surface 92b is formed so that the outer dimension becomes smaller as the size increases.

  Further, the oil amount monitoring rod member 94 in the hydraulic damper 90 according to the present embodiment has a plurality of scales 94b spaced apart from each other in the axial direction (vertical direction in the figure), and is formed at the lower end portion in the axial direction. Is different from the oil amount monitoring rod member 86 in the first embodiment in that an inclined surface 94a that contacts the tapered surface 92b of the rod-shaped member 92 is formed.

  Based on FIG.5 and FIG.6, the oil amount monitoring method of the hydraulic damper 90 which concerns on the 2nd Embodiment of this invention is demonstrated.

  First, as shown in FIG. 5, similarly to the hydraulic damper 40 according to the first embodiment, when the amount of hydraulic oil is the lower limit value, from the end surface 74a of the accumulator body 74 at the tip 92a of the rod-shaped member 92. Let L be the protruding length dimension.

  5 shows that the amount of hydraulic oil filled in the first oil chamber 56, the second oil chamber 58, and the accumulator oil chamber 76 in the cylinder 42 in FIG. It is a figure which shows the protrusion state of the front-end | tip 92a of the rod-shaped member 92 at the time of the non-operation of the hydraulic damper 90 which does not move to the axial direction within the cylinder 42. FIG.

  The protruding length dimension L3 of the tip 92a of the rod-shaped member 92 from the end face 74a of the accumulator main body 74 is larger than the protruding length dimension L when the amount of hydraulic oil is the lower limit value.

  Then, when the oil amount monitoring rod member 94 is inserted into the through hole 84a of the extension member 84, the inclined surface 94a at the lower end portion of the oil amount monitoring rod member 94 in the drawing protrudes outward from the end surface 74a of the accumulator main body 74. The taper surface 92b of the tip end portion of the rod-shaped member 92 is brought into contact.

  Next, FIG. 6 shows that the amount of hydraulic oil filled in the first oil chamber 56, the second oil chamber 58, and the accumulator oil chamber 76 in the cylinder 42 in FIG. FIG. 5 is a view showing a protruding state of a tip 92a of a rod-shaped member 92 when a hydraulic damper 90 that does not move in the axial direction in a cylinder 42 is inactive.

  The protruding length dimension L4 of the tip 92a of the rod-shaped member 92 from the end surface 74a of the accumulator main body 74 is smaller than the protruding length dimension L when the amount of hydraulic oil is the lower limit value.

  At this time, since the tapered surface 92b is formed at the distal end portion of the rod-shaped member 92, when the oil amount monitoring rod member 94 is inserted into the through hole 84a of the extension member 84, the lower end of the oil amount monitoring rod member 94 in the figure is shown. The inclined surface 94a is in contact with the tapered surface 92b of the tip of the rod-shaped member 92 that protrudes outward from the end surface 74a of the accumulator main body 74.

  However, at this time, the inclined surface 94a at the lower end portion of the oil amount monitoring rod member 94 in FIG. 5 is in contact with the portion of the tapered surface 92b of the rod-shaped member 92 that has a large diameter on the pressure type accumulator 72 side. The tapered surface 92b of the member 92 comes into contact with a portion having a small diameter on the tip 92a side (left side in the figure).

  For this reason, the length dimension inserted into the extension member 84 of the oil amount monitoring rod member 94 is such that the inclined surface 94a of the oil amount monitoring rod member 94 is thicker than the tapered surface 92b of the rod-like member 92 in FIG. It can be seen from the scale 94b that the length dimension is larger than that in contact with the portion, and the length dimension protruding outward (upward) from the outer peripheral surface 84c of the extension member 84 is reduced accordingly.

  Thus, in the hydraulic damper 90 according to the second embodiment of the present invention, the inclined surface 94a of the oil amount monitoring rod member 94 comes into contact with the tapered surface 92b of the rod-like member 92. As the hydraulic oil in the cylinder 42 decreases, the length of the oil amount monitoring rod member 94 inserted into the extension member 84 increases.

  Since a plurality of scales 94b are formed at intervals in the axial direction of the oil amount monitoring rod member 94, by visually checking the scale 94b positioned outside the outer peripheral surface 84c of the extension member 84, the hydraulic damper It can be easily recognized from the outside whether 90 has a sufficient amount of oil to perform its original function.

  Also with the hydraulic damper 90 according to the second embodiment of the present invention, the same effects as those of the hydraulic damper 40 according to the first embodiment can be obtained. That is, even if the operator does not look into the through hole 84a of the extension member 84, the change in the amount of hydraulic oil in the hydraulic damper 40 can be easily recognized from the outside.

  Further, according to the hydraulic damper 90 according to the present embodiment, the length of the oil amount monitoring rod member 94 inserted into the extension member 84 increases as the hydraulic oil in the cylinder 42 decreases. Since the amount of hydraulic oil leakage is measured after a certain period of time has elapsed since the start of damper use, how long can the hydraulic damper 90 maintain its original function after that time? Can be predicted.

  For this reason, the maintenance frequency of the hydraulic damper 90 can be reduced and appropriate.

  FIGS. 7 and 8 are views referred to for explaining a hydraulic damper 100 for vibration control according to the third embodiment of the present invention.

  As shown in FIG. 7, the oil amount monitoring rod member 102 in the hydraulic damper 100 according to the present embodiment is not limited to monitoring the oil amount, but always at other times, the through hole 84 a of the extension member 84. The amount of oil monitoring in the first embodiment is that the outer peripheral convex portion 102b (locking portion) protruding radially outward is formed on the upper end portion side in the axial direction in that point. It is different from the bar member 86.

  Based on FIG.7 and FIG.8, the oil amount monitoring method of the hydraulic damper 100 which concerns on the 3rd Embodiment of this invention is demonstrated.

  FIG. 7 shows that the amount of hydraulic oil filled in the first oil chamber 56 (see FIG. 1), the second oil chamber 58, and the accumulator oil chamber 76 in the cylinder 42 is larger than the lower limit value, and the piston 50 FIG. 1 is a view showing a protruding state of a tip end surface 82a of a rod-like member 82 when the hydraulic damper 100 that does not move in the axial direction in the cylinder 42 is inactive.

  The protrusion length dimension L1 of the tip end surface 82a of the rod-shaped member 82 from the end face 74a of the accumulator main body 74 is larger than the protrusion length dimension L when the hydraulic oil is at the lower limit value.

  The lower end portion of the oil amount monitoring rod member 102 is inserted into the through hole 84a of the extension member 84, and the distal end surface 102a of the lower end portion of the oil amount monitoring rod member 102 is caused by the gravity of the distal end portion of the rod-like member 82. Is in contact with the outer peripheral surface 82b. For this reason, the lower end portion of the oil amount monitoring rod member 102 is not inserted deeper into the extension member 84.

  At this time, the outer peripheral convex portion 102b provided on the upper end side in the axial direction of the oil amount monitoring rod member 102 is separated from the outer peripheral surface 84c of the extension member 84, and is separated from the outer peripheral surface 84c. The state of the oil amount monitoring rod member 102 can be easily confirmed from the outside.

  Next, FIG. 8 shows that the amount of hydraulic oil filled in the first oil chamber 56 (see FIG. 1), the second oil chamber 58, and the accumulator oil chamber 76 in the cylinder 42 is less than the lower limit value. FIG. 2 is a view showing a protruding state of the tip end surface 82a of the rod-like member 82 when the hydraulic damper 100 in which the piston 50 (see FIG. 1) does not move in the axial direction within the cylinder 42 is inactive.

  The protrusion length dimension L2 of the tip surface 82a of the rod-shaped member 82 from the end face 74a of the accumulator main body 74 is smaller than the protrusion length dimension L when the amount of hydraulic oil is the lower limit value.

  For this reason, the oil amount monitoring rod member 102 has a tip end surface 102a at the lower end portion in the drawing that does not come into contact with the outer peripheral surface 82b at the tip end portion of the rod-like member 82. Further, it is inserted deeper into the extension member 84 (downward in the figure).

  The lower surface of the outer peripheral convex portion 102 b provided at the upper end portion of the oil amount monitoring rod member 102 comes into contact with the outer peripheral surface 84 c of the extension member 84.

  As described above, the hydraulic damper 100 according to the present embodiment has the oil amount monitoring rod member 102 in the case where the total amount of hydraulic oil in the cylinder 42 in FIG. 1 is larger than the lower limit value and smaller than the lower limit value. The length of the lower end portion inserted into the extension member 84 is different.

  Then, the hydraulic damper 100 recognizes whether the hydraulic damper 100 is originally separated by visually checking whether or not the outer peripheral convex portion 102b provided at the upper end of the oil amount monitoring rod member 102 is separated from the outer peripheral surface 84c of the extension member 84. It is possible to easily recognize from the outside whether the oil amount is sufficient to exhibit the function.

  Further, since the hydraulic damper 100 has an outer peripheral convex portion 102b formed on the oil amount monitoring rod member 102, the lower end portion of the oil amount monitoring rod member 102 is inserted into the extension member 84 more deeply than necessary. Can be prevented.

  Also with the hydraulic damper 100 according to the third embodiment of the present invention, the same effect as that of the hydraulic damper 40 according to the first embodiment can be obtained.

  Further, according to the hydraulic damper 100 according to the present embodiment, the oil amount monitoring rod member 102 is always inserted into the through hole 84a of the extension member 84 not only when monitoring the oil amount but also at other times. Since it can be inserted, the operator can quickly check the amount of hydraulic oil in the hydraulic damper 100.

  FIG. 9 to FIG. 11 are diagrams which are referred to for explaining a vibration-damping hydraulic damper 110 according to the fourth embodiment of the present invention.

  As shown in FIG. 9, the oil amount monitoring rod member 112 in the hydraulic damper 110 according to the present embodiment always has a lower end portion in the axial direction (vertical direction in the drawing) even when not monitoring the oil amount. The oil in the first embodiment in that it is inserted through the through hole 84a of the extension member 84 and the outer peripheral convex part 122b that protrudes radially outward is formed on the upper end side in the axial direction. This is different from the quantity monitoring bar member 86.

  The oil amount monitoring rod member 112 has a spring 114 (elastic member) in which both end surfaces in the expansion / contraction direction (vertical direction in the figure) are sandwiched between the lower surface of the outer peripheral convex portion 122b and the outer peripheral surface 84c of the extension member 84. ) Is supported from the lower side while being pressed upward in the figure.

  By the way, in the hydraulic damper 100 according to the third embodiment, when the hydraulic damper 100 in which the piston 50 moves in the axial direction in the cylinder 42 is operated, the tip end surface 82a of the rod-shaped member 82 is the oil amount monitoring rod member. The tip end surface 112a of the lower end portion in the figure of the oil amount monitoring rod member 112 is located on the outer side in the radial direction from the outer peripheral surface 74b of the accumulator main body 74 of the pressure accumulator 72. Therefore, even when the hydraulic damper 110 in which the piston 50 moves in the axial direction in the cylinder 42 is operated, the tip end surface 82a of the rod-like member 82 does not come into contact with the lower end portion of the oil amount monitoring rod member 112. It has become.

  Based on FIGS. 9 to 11, an oil amount monitoring method for the hydraulic damper 110 according to the fourth embodiment of the present invention will be described.

  10 shows that the amount of hydraulic oil filled in the first oil chamber 56 (see FIG. 1), the second oil chamber 58, and the accumulator oil chamber 76 in the cylinder 42 is larger than the lower limit, and the piston 50 FIG. 6 is a view showing a protruding state of a tip end surface 82a of a rod-shaped member 82 when the hydraulic damper 110 that does not move in the axial direction in the cylinder 42 is inactive.

  The protrusion length dimension L1 of the tip end surface 82a of the rod-shaped member 82 from the end face 74a of the accumulator main body 74 is larger than the protrusion length dimension L when the amount of hydraulic oil is the lower limit value.

  When a pressing force F is applied to the oil amount monitoring rod member 112 from above in the drawing, the spring 114 that presses the oil amount monitoring rod member 112 upward in the drawing contracts, and the lower end portion of the oil amount monitoring rod member 112 extends. It is pushed into the member 84.

  The oil amount monitoring rod member 112 is configured such that the tip surface 112a at the lower end portion in the drawing is in contact with the outer peripheral surface 82b at the tip portion of the rod-shaped member 82.

  Therefore, after the front end surface 112a of the oil amount monitoring rod member 112 comes into contact with the outer peripheral surface 82b of the rod-like member 82, the oil amount monitoring rod member 112 cannot be pushed further into the extension member 84. ing.

  Next, FIG. 11 shows that the amount of hydraulic oil filled in the first oil chamber 56, the second oil chamber 58, and the accumulator oil chamber 76 in the cylinder 42 is less than the lower limit value, and the piston 50 is a cylinder. FIG. 4 is a diagram showing a protruding state of a tip end surface 82a of a rod-shaped member 82 when the hydraulic damper 110 that does not move in the axial direction within 42 is inactive.

  The protruding length dimension L2 of the tip end surface 82a of the rod-shaped member 82 from the end face 74a of the accumulator main body 74 is smaller than the protruding length dimension L when the amount of hydraulic oil is the lower limit value.

  Even if a pressing force F is applied to the oil amount monitoring rod member 112 from above in the drawing and the lower end portion of the oil amount monitoring rod member 112 is pushed into the extension member 84, the tip of the lower end portion in the drawing of the oil amount monitoring rod member 112 is shown. The surface 112 a is configured not to contact the outer peripheral surface 82 b of the tip end portion of the rod-shaped member 82.

  Accordingly, since the tip end surface 112a of the oil amount monitoring rod member 112 does not contact the rod-shaped member 82, the lower end portion of the oil amount monitoring rod member 112 is placed inside the extension member 84 as compared with the case of FIG. It can be inserted deeply.

  As described above, in the hydraulic damper 110 according to the present embodiment, the lower end portion of the oil amount monitoring rod member 112 is the extension member when the amount of hydraulic oil in the cylinder 42 is larger than the lower limit value and when it is smaller than the lower limit value. The length dimension inserted in 84 is different.

  Then, by pushing in the oil amount monitoring rod member 112 and confirming whether the tip end surface 112a abuts on the rod-like member 82, the hydraulic damper 110 can be operated even if a person does not look into the protruding state of the rod-like member 82. It is possible to easily recognize from the outside whether the oil amount is sufficient to perform its original function.

  Further, in the hydraulic damper 110, since the oil amount monitoring rod member 112 is supported from below by the spring 114, the state in which the oil amount monitoring rod member 112 is pushed deeper than necessary into the extension member 84 is maintained. Can be prevented.

  Also with the hydraulic damper 110 according to the fourth embodiment of the present invention, the same effect as that of the hydraulic damper 40 according to the first embodiment can be obtained.

  In addition, according to the hydraulic damper 110 according to the present embodiment, the oil amount monitoring rod member 112 is always placed in the through hole 84a of the extension member 84 at other times as well as when the oil amount is monitored. Since it can be inserted, the operator can quickly check the amount of hydraulic oil in the hydraulic damper 100.

  Further, according to the hydraulic damper 110 according to the present embodiment, even when the hydraulic damper 110 in which the piston 50 moves in the axial direction within the cylinder 42 is actuated, the tip end surface 82a of the rod-shaped member 82 is connected to the oil amount monitoring rod member 112. Can be prevented from contacting.

  FIG. 12 is a diagram that is referred to for explaining a vibration-damping hydraulic damper 120 according to the fifth embodiment of the present invention.

  As shown in FIG. 12, the extension member 122 in the hydraulic damper 120 according to the present embodiment has a cylindrical guide portion 122 d having a wall thickness around the through-hole 122 a and a diameter from the inner peripheral surface of the extension member 122. It differs from the extending member 84 in the first embodiment in that it is formed to protrude inward in the direction.

  For this reason, the extension member 122 is formed so that the depth dimension of the through hole 122a is larger than the depth dimension of the through hole 84a of the extension member 84 in the first embodiment.

  The extension member 122 has an end 122 (right end in the drawing) near the pressure accumulator 72 of the through-hole 122a, and the tip end surface 82a (tip) of the rod-like member 82 when the amount of hydraulic oil is the lower limit. And are arranged so as to be substantially the same position.

  For this reason, when the oil amount monitoring rod member 86 is inserted into the through hole 122a of the extension member 122, the axis of the oil amount monitoring rod member 86 is inclined with respect to the axial direction of the through hole 122a of the extension member 122. As compared with the hydraulic damper 40 according to the first embodiment, it can be surely prevented.

  Also with the hydraulic damper 120 according to the fifth embodiment of the present invention, the same effect as that of the hydraulic damper 40 according to the first embodiment can be obtained.

  Further, according to the hydraulic damper 120 according to the present embodiment, the axis of the oil amount monitoring rod member 86 can be prevented from being inclined with respect to the axial direction of the through hole 122a of the extension member 122. The detection accuracy of the amount of hydraulic oil in 120 can be prevented more reliably than the hydraulic damper 40 according to the first embodiment.

  Further, since the oil amount monitoring rod member 86 can be easily inserted vertically into the through hole 122a of the extension member 122, the operator can quickly confirm the amount of hydraulic oil in the hydraulic damper 120. it can.

  In the hydraulic damper 40 and the like according to the first to fifth embodiments, the vibration damper for vibration control has been described. However, the present invention can be applied to a hydraulic damper for seismic isolation or other types of hydraulic dampers. Can also be applied.

  Further, the pressurization type accumulator 72 in the hydraulic damper 40 or the like according to the above embodiment is provided in series with the second piston rod portion 54 in the axial direction. However, the conventional hydraulic damper 2 shown in FIG. It may be provided in the inside of the 2nd piston rod part 54 like this.

  Further, the rod-like member 82 and the like in the hydraulic damper 40 and the like according to the above-described embodiment are formed in a round bar shape, but are not limited to a round bar shape, and may be a square bar shape or the like.

  Further, although the through hole 84a of the extension member 84 in the hydraulic damper 40 or the like according to the above embodiment is formed in a circular shape, it is not necessary to be limited to a circular shape, and may be a polygonal shape or the like. . Further, the shape of the oil amount monitoring rod member 86 or the like may not be a round rod shape, and may be changed to a shape corresponding to another shape of the through hole 84a of the extension member 84.

  Further, the guide part 122d of the extension member 122 in the hydraulic damper 120 according to the above embodiment has a cylindrical guide part 122d having a wall thickness around the through hole 122a, and the radial direction from the inner peripheral surface of the extension member 122. The cylindrical guide portion having a thickness around the through-hole 122a is formed so as to protrude from the outer peripheral surface 122c of the extension member 122 toward the radially outer side. It may be.

  Further, a pair of inner and outer cylindrical guide portions protruding toward both the inner and outer surfaces in the radial direction from the inner and outer surfaces of the extension member 122 and the outer and outer surfaces 122c may be formed.

  In addition, hydraulic dampers different from these embodiments may be configured by appropriately combining the configurations of the hydraulic damper 40 and the like according to the above-described embodiment.

  Further, in the oil amount monitoring method for the hydraulic damper 40 and the like according to the above-described embodiment, the case where the piston 50 does not move in the axial direction in the cylinder 42 and the hydraulic damper 40 and the like are not operating has been described. When the hydraulic damper 40 or the like moving in the axial direction in the cylinder 42 is operated, the pressure of the accumulator oil chamber 76 is not stabilized by an external force such as an earthquake, so that the oil amount cannot be monitored accurately. The oil amount monitoring method at the time was omitted.

  Further, instead of the oil amount monitoring rod member 86 or the like in the hydraulic damper 40 or the like according to the above-described embodiment, an electrical signal that detects the rod-like member 82 and outputs a signal using the through hole 84a of the extension member 84 is used. A position sensor or a length measuring sensor that electrically measures the protruding length dimension from the outer peripheral surface 84 c of the extension member 84 to the rod-shaped member 82 and outputs a signal may be used.

  For such an electrical sensor, if a non-contact type sensor that does not inhibit the operation of the hydraulic damper 40 or the like is used, it is possible to always connect the sensor to the hydraulic damper 40 or the like.

2 Hydraulic damper 4 Cylinder 4a, 4b End face 6 Piston 6a, 6b End face 6c, 6d Oil passage 8, 10 Oil chamber 12, 14 Piston rod 14a Shaft hole 14b End face 16 Extension member 16a Through hole 18, 20 Relief valve 22 Accumulator 24 Accumulator oil chamber 26 Accumulator piston 28 Spring 30 Bar-shaped member 40 Hydraulic damper 42 Cylinder 44 Cylinder body 46, 48 Cover member 46a, 48a Fitting hole 50 Piston 52 First piston rod portion 54 Second piston rod portion 56 First oil chamber 58 Second oil chamber 60, 62 Flow path 64, 66 Relief valve 68, 70 Flow path 72 Pressurization type accumulator 74 Accumulator main body 74a End surface 76 Accumulator oil chamber 78 Accumulator piston 80 Spring 82 Rod-shaped member 82a End surface 8 b Outer surface 84 Extension member 84a Through hole 84b Edge 84c Outer surface 86 Oil amount monitoring rod member 86a Tip surface 86b Marking 90 Hydraulic damper 92 Rod member 92a Tip 92b Tapered surface 94 Oil amount monitoring rod member 94a Inclined surface 94b Scale 100 Hydraulic pressure Damper 102 Oil amount monitoring rod member 102a Front end surface 102b Outer peripheral convex portion 110 Hydraulic damper 112 Oil amount monitoring rod member 112a Front end surface 112b Outer peripheral convex portion 114 Spring 120 Hydraulic damper 122 Extension member 122a Through hole 122b Edge portion 122c Outer peripheral surface 122d Guide portion A Arrow F Pressing force L, L1, L2, L3, L4 Projection length dimension

Claims (6)

A cylinder,
A piston housed in the cylinder;
Two oil chambers formed on both sides of the piston in the cylinder;
An accumulator provided on a piston rod protruding outward from the cylinder of the piston, and having an oil chamber communicating with the two oil chambers;
A rod-like member that increases or decreases in an amount protruding outward from the accumulator in accordance with a change in pressure of hydraulic oil in the cylinder;
An extension member extending from the cylinder in its length direction and covering the periphery of the accumulator;
An oil amount monitoring rod member inserted into a through hole formed in the extension member,
When the oil amount monitoring rod member is inserted into the through-hole, the change in the amount of hydraulic oil in the entire damper can be determined based on the length of the oil amount monitoring rod member inserted into the extension member. Hydraulic damper characterized by that. A tapered surface is formed at the tip of the rod-shaped member,
2. The hydraulic damper according to claim 1, wherein a taper surface that is slidable in contact with a taper surface of the tip portion of the rod-shaped member is formed at a tip portion of the oil amount monitoring rod member. .   2. The oil amount monitoring rod member having a lower end inserted through a through hole of the extension member is formed with a locking portion that is locked to an outer peripheral surface of the extension member. Or the hydraulic damper of 2.   The oil amount monitoring rod member, whose lower end is inserted into the through hole of the extension member, is supported by an elastic member such that the end surface of the lower end is disposed radially outside the outer peripheral surface of the accumulator. The hydraulic damper according to any one of claims 1 to 3, wherein the hydraulic damper is provided.   5. The hydraulic pressure according to claim 1, wherein a guide portion that protrudes in a radial direction from one or both of the inner and outer peripheral surfaces of the extension member is formed around the through hole of the extension member. damper. A cylinder,
A piston housed in the cylinder;
Two oil chambers formed on both sides of the piston in the cylinder;
An accumulator provided on a piston rod protruding outward from the cylinder of the piston, and having an oil chamber communicating with the two oil chambers;
A rod-like member that increases or decreases in an amount protruding outward from the accumulator in accordance with a change in pressure of hydraulic oil in the cylinder;
An extension member extending from the cylinder in its length direction and covering the periphery of the accumulator;
An oil amount monitoring method for a hydraulic damper comprising an oil amount monitoring rod member inserted through a through hole formed in the extension member,
The oil amount monitoring rod member is inserted into the through hole, and the change in the amount of hydraulic oil in the entire damper is determined based on the length of the oil amount monitoring rod member inserted into the extension member. An oil amount monitoring method for a hydraulic damper, characterized by

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