JP2021179229A - Buffer - Google Patents

Abstract

To enable a piston rod to be made in a maximum contraction state with a simple operation, and further enable the piston rod to be disengaged without any damage even in a case where the piston rod is forcibly pulled out.SOLUTION: An engagement member 10 provided between a piston 3 and a fixed valve 8 and fixing the piston 3 in the vicinity of the fixed valve 8 has a first member 11 attached to a piston rod 4 and having the tip of an arm part 11B having a hook-shaped claw part 11C, and a second member 12 attached to the fixed valve 8 and having an outer peripheral part made of a circular plate material. The first member 11 and the second member 12 are configured to be in an engaged state after at least one of the piston rod 4 and the fixed valve 8 are elastically deformed when the piston rod approaches the fixed valve.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a shock absorber suitably used for cushioning vibration of a building, an automobile, a railroad vehicle, or the like.

Generally, a shock absorber is used to suppress the vibration of a building due to an earthquake and the vibration when an automobile or a railroad vehicle travels. This shock absorber has a bottomed cylindrical cylinder filled with fluid such as hydraulic oil, a piston that slides inside the cylinder, and a piston that has one end connected to the piston and the other end projects from one end of the cylinder. It is equipped with a rod.

Here, when painting the outer surface of the shock absorber, the exposed portion of the piston rod is masked so that the paint does not adhere to the exposed portion of the piston rod that goes in and out of the cylinder. On the other hand, in order to omit the masking work when painting the shock absorber, a holding device for holding the shock absorber in a state where the piston rod is in the fully contracted state has been devised (Patent Document 1).

However, when the holding device is provided separately from the shock absorber as in the invention of Patent Document 1, there is a problem that not only the cost increases but also the work of attaching and detaching the shock absorber becomes necessary and the workability is deteriorated. .. Therefore, some shock absorbers have a function of holding the piston rod in the fully contracted state in the shock absorber itself (Patent Documents 2 to 4).

The inventions of Patent Documents 2 to 4 include an engaging member having the same function. This engaging member engages the piston rod with each other by relatively rotating the cylinder and the piston rod in a state where the piston rod is greatly pushed into the cylinder, and holds the piston rod in the fully contracted state. On the other hand, by rotating relative to each other in the opposite direction, the engaging member has a structure that disengages and allows the piston rod to extend.

Japanese Unexamined Patent Publication No. 2017-96452 Japanese Unexamined Patent Publication No. 2000-161488 Japanese Unexamined Patent Publication No. 2004-124994 Japanese Unexamined Patent Publication No. 2009-36265

By the way, in the inventions of Patent Documents 2 to 4, if the piston rod is pulled without disengaging the engaging member, the engaging member may be damaged. As described above, when the engaging member is damaged, the fragments of the engaging member will float in the oil chamber in the shock absorber, which may cause malfunction or the like.

An object of the embodiment of the present invention is that the piston rod can be brought into the fully contracted state by a simple operation, and even if the piston rod is forcibly pulled, it can be disengaged without being damaged. To provide a shock absorber.

In one embodiment of the present invention, a bottomed tubular cylinder in which fluid is sealed, a piston arranged in the cylinder and sliding, one end is connected to the piston, and the other end protrudes from one end of the cylinder. A piston rod, a fixed valve fixed to the bottom side of the cylinder with respect to the piston, and an engaging member provided between the piston and the fixed valve to fix the piston in the vicinity of the fixed valve. The engaging member is attached to one of the piston rod or the fixed valve and has a hook-shaped tip, and is attached to the other of the piston rod or the fixed valve and has an outer circumference. A second member having a portion made of a circular plate material, and the first member and the second member have at least one of the first member and the second member when the piston rod approaches the fixed valve. It is characterized in that it is elastically deformed and then engaged.

According to one embodiment of the present invention, the piston rod can be brought to the minimum contracted state by a simple operation, and even if the piston rod is forcibly pulled, the engagement can be disengaged without damage. ..

It is sectional drawing which shows the shock absorber by 1st Embodiment of this invention in the engaged state (the most contracted state of a piston rod) of an engaging member. It is a perspective view which shows the main part of the shock absorber of FIG. 1 in an enlarged manner. It is a front view which shows the main part of the shock absorber of FIG. 1 in an enlarged manner. FIG. 3 is an enlarged perspective view showing a cylinder, a piston, a piston rod, a fixed valve, an engaging member, and the like in FIG. 1. It is sectional drawing which shows the state which disengaged the engagement of a 1st member and a 2nd member. It is sectional drawing which shows the 1st member by 1st Embodiment. It is sectional drawing which shows the 1st member and 2nd member by the 2nd Embodiment of this invention in the state which disengaged. It is sectional drawing which shows the 1st member by 3rd Embodiment.

Hereinafter, a case where the shock absorber according to the embodiment of the present invention is used as, for example, a hydraulic shock absorber that suppresses vibration acting on a building due to an earthquake will be taken as an example, and will be described in detail with reference to the accompanying drawings.

1 to 6 show a first embodiment of the present invention. In this first embodiment, the case where the first member is arranged on the piston rod and the second member is arranged on the fixed valve is exemplified. The hydraulic shock absorber 1 includes a cylinder 2, a piston 3, a piston rod 4, a rod guide 5, an oil seal 6, a dust seal 7, a fixed valve 8, an engaging member 10, and a bracket 13, which will be described later.

The cylinder 2 is formed in a bottomed cylinder shape. Hydraulic oil or the like is sealed in the cylinder 2 as a fluid. The fluid is not limited to hydraulic oil, and for example, water mixed with additives can be used.

Further, one end of the cylinder 2 becomes an open end 2A, and a piston rod 4 described later protrudes from the open end 2A. On the other hand, the other end of the cylinder 2 is closed by the bottom cap 2B. Further, the cylinder 2 is provided with a plurality of, for example, three full-circumferential caulking portions 2C, 2D, 2E protruding toward the inner peripheral side at intervals in the axial direction. The all-around caulking portion 2C on the one end side is arranged in the vicinity of the open end 2A. The all-around caulking portions 2D and 2E fix the fixed valve 8 described later, and are arranged at positions away from the bottom cap 2B at intervals according to the axial dimension of the fixed valve 8. As the caulking portion, in addition to the all-around caulking portion 2C, 2D, 2E, a plurality of locations in the circumferential direction, for example, partial caulking such as 4 points or 6 points may be used. Further, the structure protruding toward the inner peripheral side like the crimped portion can be formed by using other processing means such as curling processing.

As shown in FIGS. 2 and 3, the open end 2A is formed with a reduced diameter so as to project toward the inner peripheral side, similarly to the full-circumferential caulking portions 2C, 2D, and 2E. As a result, the open end 2A fixes the rod guide 5 and the oil seal 6, which will be described later, between the all-around caulking portion 2C. Further, the bottom cap 2B of the cylinder 2 is attached with a bottom side mounting bracket 2F that is attached to the structure of the building via a bracket (neither is shown).

The piston 3 is arranged in the cylinder 2 so as to be movable (sliding) in the axial direction. The piston 3 divides the inside of the cylinder 2 into a first oil chamber A on the piston rod 4 side and a second oil chamber B on the fixed valve 8 side. The piston 3 is provided with flow paths 3A and 3B and flow paths 3A and 3B for flowing hydraulic oil between the first oil chamber A and the second oil chamber B when the piston 3 is displaced in the cylinder 2. Damping force generating mechanisms 3C and 3D including a disc valve that applies a damping force to the circulating hydraulic oil are provided. The piston 3 has damping force generating mechanisms 3C and 3D arranged so as to cover the flow paths 3A and 3B, and the piston rod is formed by screwing a first member 11 described later to one end of the piston rod 4 inserted therein. It is attached to 4.

One end of the piston rod 4 is connected to the piston 3, and the other end protrudes from one end of the cylinder 2. The piston rod 4 extends from the other end of the small diameter portion 4A to the opening end 2A side in the cylinder 2 to the small diameter portion 4A inserted through the piston 3, and has a large diameter portion 4B having a larger diameter than the small diameter portion 4A and a small diameter portion. It is provided with a screw portion 4C provided on the tip end side of 4A. Further, at the other end of the large diameter portion 4B, a rod-side mounting bracket 4D that is mounted to the structure of the building via a bracket (none of which is shown) is mounted.

The rod guide 5 is provided at the open end 2A in order to close one end of the cylinder 2. The rod guide 5 constitutes a closing member together with the oil seal 6 and the dust seal 7 described later. The rod guide 5 is formed as an annular body that closes the gap between the cylinder 2 and the piston rod 4. Further, a cylindrical bush 5A with which the piston rod 4 is in sliding contact is inserted on the inner peripheral side of the rod guide 5.

An annular end face portion 5B is formed on one end side of the rod guide 5 so as to be located on the outer side in the radial direction. The end face portion 5B is located on one end side of the cylinder 2, and is arranged on the other end side of the open end 2A of the cylinder 2, that is, at a position recessed inside the cylinder 2. On the other hand, an oil seal 6 is provided facing the other end of the rod guide 5. The outer peripheral side of the rod guide 5 and the oil seal 6 is fixed between the open end 2A of the cylinder 2 and the all-around caulking portion 2C. The oil seal 6 prevents the hydraulic oil in the first oil chamber A from leaking to the outside.

The dust seal 7 is provided on the inner diameter side of the end face portion 5B of the rod guide 5. The dust seal 7 prevents dust such as dust adhering to the large diameter portion 4B of the piston rod 4 from entering between the large diameter portion 4B and the bush 5A.

The fixed valve 8 is located in the cylinder 2 and is fixed to the bottom cap 2B side, which is the bottom side of the piston 3. The fixed valve 8 is a damping force generating mechanism including an annular base block 8A fixed in the cylinder 2, a valve body 8B provided at the center of the axis of the base block 8A, and a disc valve attached to the valve body 8B. It is composed of (not shown) and. The outer peripheral side of the base block 8A is fixed between the crimped portions 2D and 2E on the entire circumference of the cylinder 2. As a result, the fixed valve 8 forms a reservoir oil chamber C fractionated from the second oil chamber B in the cylinder 2. The reservoir oil chamber C is an oil chamber for releasing hydraulic oil corresponding to the approach volume of the piston rod 4 when the piston rod 4 is contracted (contraction stroke).

Here, a bolt 8C is provided at the center of the axis of the valve body 8B so as to penetrate in the axial direction. The tip end side of the bolt 8C extends toward the piston rod 4, and a nut 8D is screwed to the tip end thereof. The bolt 8C and the nut 8D have both a function of fixing the damping force generating mechanism to the valve body 8B and a function of fixing the second member 12 described later.

The free piston 9 is located in the cylinder 2 and is slidably fitted between the bottom cap 2B and the fixed valve 8. As a result, the free piston 9 divides the space between the bottom cap 2B and the fixed valve 8 into the reservoir oil chamber C on the fixed valve 8 side and the gas chamber D on the bottom cap 2B side. The gas chamber D is filled with gas for allowing the reservoir oil chamber C to expand and contract (the free piston 9 slides).

Next, the configuration, function, and the like of the engaging member 10 which is a feature of the present invention will be described.

The engaging member 10 is provided between the piston 3 and the fixed valve 8. The engaging member 10 fixes the piston 3 in the vicinity of the fixing valve 8. That is, the engaging member 10 fixes the piston rod 4 connected to the piston 3 in the most contracted state in which the piston rod 4 has entered the cylinder 2 most. On the other hand, the engaging member 10 is pulled in the extension direction with a pulling force larger than the force at which the pressure in the gas chamber D in the fully contracted state of the piston rod 4 tries to extend the piston rod 4 via the piston 3. At that time, the fixing (engagement) of the piston 3 and the piston rod 4 can be released. The engaging member 10 is composed of a first member 11 and a second member 12, which will be described later.

The first member 11 is attached to the piston rod 4. The first member 11 also serves as a nut for fixing the piston 3 to the piston rod 4. As shown in FIGS. 4 and 6, the first member 11 includes a hexagonal nut portion 11A having six sides and a pair of arm portions 11B provided on two facing sides of the six sides. It is configured as an integral part.

The pair of arm portions 11B are formed as a plate body extending in parallel from the nut portion 11A toward the fixed valve 8. The length dimension of the pair of arm portions 11B is set so that the tip portion exceeds the second member 12 in the fully contracted state of the piston rod 4. Here, the pair of arm portions 11B is deformed before the second member 12 is deformed when the piston rod 4 is pulled, and the claw portion 11C described later does not come off from the second member 12. The strength (rigidity) is set so as to.

A hook-shaped claw portion 11C is provided on the tip portions of the pair of arm portions 11B so as to project in a direction facing each other (approaching direction). The claw portion 11C is formed as a triangular claw having an inclined surface 11C1 and a flat surface 11C2. The inclined surface 11C1 comes into contact with the peripheral edge of the second member 12 when the piston rod 4 is pushed toward the maximum contracted position, so that both the arm portion 11B and the second member 12 of the first member 11 come into contact with each other. Is gradually elastically deformed so that the second member 12 can be smoothly overcome. Further, the flat surface 11C2 can be stably engaged with the second member 12 by surface contact when the claw portion 11C gets over the second member 12.

The second member 12 is attached to the fixed valve 8. The second member 12 is formed as a plate material having a circular outer peripheral portion, that is, an annular plate body having an open center. The outer diameter dimension of the second member 12 is set to be smaller than the spacing dimension of the facing surfaces of the pair of arm portions 11B and larger than the spacing dimension of the pair of claw portions 11C. As a result, the second member 12 can engage the outer peripheral side thereof with the pair of claw portions 11C. Moreover, the second member 12 made of a circular plate can engage the claw portion 11C with any portion in the circumferential direction under the same engagement conditions.

Here, the second member 12 is formed by using an elastic member including a metal material and a resin material. On this basis, the strength (rigidity) of the second member 12 is compared with the force that the pressure in the gas chamber D in the fully contracted state of the piston rod 4 tries to extend the piston rod 4 through the piston 3. The strength is set so that it elastically deforms when pressed against the pair of claw portions 11C with a force larger than this force.

The engaging member 10 configured in this way is a pair of the first members 11 by, for example, at the end of the performance test of the hydraulic shock absorber 1 that expands and contracts the piston rod 4, and by contracting the piston rod 4 to the maximum. The arm portion 11B and the second member 12 are elastically deformed, and the pair of claw portions 11C of the first member 11 are engaged with the outer peripheral side of the second member 12. On the other hand, as shown in FIG. 5, the engaging member 10 elastically deforms the second member 12 by pulling the piston rod 4 in the extension direction, and the pair of the second member 12 to the first member 11 is paired. The claw portion 11C can be separated. In this case, since the engaging member 10 is provided for painting the cylinder 2, there is no problem even if the engaging member 10 remains bent and cannot be reused.

As shown in FIG. 1, the bracket 13 is fixed to the other end of the piston rod 4. The bracket 13 has a disk-shaped lid portion 13A extending radially outward from the other end of the large diameter portion 4B of the piston rod 4, and an end face portion 5B of the rod guide 5 as a closing member from the outer circumference of the lid portion 13A. It is configured to include a tubular portion 13B extending toward it. The cylinder portion 13B has a size that fits on the inner peripheral side of the cylinder 2. Therefore, the bracket 13 can cover the dust seal 7 in the fully contracted state of the piston rod 4 in which the cylinder portion 13B is housed in the open end 2A of the cylinder 2. As a result, the bracket 13 can prevent the paint from adhering to the dust seal 7.

Further, the tubular portion 13B is provided with a plurality of hole portions 13C penetrating in the radial direction at intervals in the circumferential direction. Each hole portion 13C is arranged at a position where it overlaps with the open end 2A of the cylinder 2 when the piston rod 4 is in the fully contracted state. That is, the operator can confirm that the piston rod 4 is in the fully contracted state only by visually observing whether each hole portion 13C is arranged at a position overlapping with the open end 2A of the cylinder 2.

Next, an example of the work procedure when painting the hydraulic shock absorber 1 will be described. First, a painting preparation work is performed to cover the part where the paint should not adhere. In the painting preparation work, the piston rod 4 is minimized so that the pair of claw portions 11C of the first member 11 is engaged with the outer peripheral side of the second member 12. In this painting preparation work, for example, at the end of the performance test of the hydraulic shock absorber 1, the piston rod 4 can be brought into the minimum reduced state by greatly reducing the piston rod 4. Further, when the piston rod 4 is fully reduced, whether or not the piston rod 4 is in the fully reduced state can be accurately determined by visually observing whether each hole 13C of the bracket 13 overlaps with the opening end 2A of the cylinder 2. You can judge.

After the painting preparation work, the hydraulic shock absorber 1 is placed in the painting booth to paint and the paint is dried. Then, when the painting work is completed, the piston rod 4 is pulled to the extension side to elastically deform the outer peripheral side of the second member 12 and disengage the pair of claw portions 11C of the first member 11.

The hydraulic shock absorber 1 according to the first embodiment has the above-mentioned configuration, and the operation thereof will be described next.

In the hydraulic shock absorber 1, the bottom side mounting bracket 2F of the cylinder 2 is mounted on, for example, one structure of a building. On the other hand, the rod-side mounting bracket 4D of the piston rod 4 is mounted on another structure of the building. As a result, the piston rod 4 contracts or expands in the axial direction, so that the vibrations caused by the earthquake can be damped by the damping force generation mechanisms 3C and 3D of the piston 3.

Thus, according to the first embodiment, the engaging member 10 provided between the piston 3 and the fixed valve 8 and fixing the piston 3 in the vicinity of the fixed valve 8 is attached to the piston rod 4 and has an arm portion. It has a first member 11 whose tip end is a hook-shaped claw portion 11C, and a second member 12 which is attached to a fixed valve 8 and whose outer peripheral portion is made of a circular plate material. The first member 11 and the second member 12 are configured to be in an engaged state after at least one of the piston rods 4 is elastically deformed when the piston rod 4 approaches the fixed valve 8.

Therefore, the piston rod 4 can be brought into the minimum reduced state by greatly reducing the piston rod 4 and engaging the first member 11 and the second member 12. Further, by pulling the piston rod 4 to the extension side, the outer peripheral side of the second member 12 is elastically deformed to release the engagement between the pair of claw portions 11C of the first member 11 and the second member 12. be able to.

As a result, when painting the hydraulic shock absorber 1, masking work, masking removal work, and a masking jig are not required, so that the painting work can be performed efficiently and inexpensively. Moreover, since the work instead of masking is the work of reducing the piston rod 4 and the work of pulling it, the first member 11 and the second member 12 can be engaged and separated with one touch, and the working time can be reduced. Can be shortened.

On the other hand, the engagement and disengagement of the engaging member 10 does not require the relative rotation of the cylinder 2 and the piston rod 4 as in Patent Documents 2 to 4 described in the prior art, so that the engagement is insufficient and painting is performed. The engagement will not be disengaged during the work and the piston rod 4 will not be extended or damaged during the rotation operation. Further, the debris of the engaging member 10 does not float in the hydraulic shock absorber 1, and the durability can be improved.

The first member 11 also serves as a nut for fixing the piston 3 to the piston rod 4. Further, the second member 12 is sandwiched and fixed between the valve body 8B of the fixed valve 8 and the nut 8D. As a result, the man-hours for assembly work can be reduced and the installation space can be kept small. Further, in Patent Document 3 described in the prior art, there is a risk that paint may enter through the hole, but since the engaging member 10 is built in the cylinder 2, it is possible to prevent the paint from entering.

Next, FIG. 7 shows a second embodiment of the present invention. The feature of this embodiment is that the first member and the second member are configured such that the first member elastically deforms and engages with and disengages from the second member. In the second embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 7, the engaging member 21 according to the second embodiment is composed of the first member 22 and the second member 23, similarly to the engaging member 10 according to the first embodiment. Further, the first member 22 is formed by a nut portion 22A, an arm portion 22B, and a claw portion 22C having an inclined surface 22C1 and a flat surface 22C2, similarly to the first member 11 according to the first embodiment. There is. Further, the second member 23 is formed as an annular plate body like the second member 12 according to the first embodiment.

However, in the engaging member 21 according to the second embodiment, the rigidity of the second member 23 is high, and when the claw portion 22C of the first member 22 engages with and disengages from the second member 23, the arm portion It differs from the engaging member 10 according to the first embodiment in that the 22B is elastically deformed.

Thus, even in the second embodiment configured in this way, it is possible to obtain substantially the same effects as those in the first embodiment described above.

Next, FIG. 8 shows a third embodiment of the present invention. The feature of this embodiment is that the first member is provided separately from the nut for fixing the piston to the piston rod. In the third embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 8, the first member 31 is directed toward the fixed valve 8 from a position facing the mounting plate portion 31A, which is an annular plate into which the threaded portion 4C of the piston rod 4 is inserted, and the outer periphery of the mounting plate portion 31A. It is composed of a pair of arm portions 31B extending in parallel and a hook-shaped claw portion 31C protruding from the tip portions of the pair of arm portions 31B in directions facing each other. The first member 31 according to the third embodiment has the same function (structure) regarding engagement and disengagement with the second member 12 as the first member 11 according to the first embodiment.

The first member 31 is attached to the piston rod 4 by inserting the threaded portion 4C of the piston rod 4 into the mounting plate portion 31A and screwing the nut 32 into the threaded portion 4C. For the nut 32, an existing nut for fixing the piston 3 to the piston rod 4 can be used.

Thus, even in the third embodiment configured in this way, it is possible to obtain substantially the same action and effect as in the above-mentioned first embodiment. In particular, in the third embodiment, the existing nut 32 can be used to fix the first member 31 to the piston rod 4.

In the first embodiment, the configuration in which the first member 11 is arranged on the piston rod 4 and the second member 12 is arranged on the fixed valve 8 is exemplified. However, the present invention is not limited to this, and the first member may be arranged on the fixed valve and the second member may be arranged on the piston rod. This configuration is similarly applicable to other embodiments.

Further, in the first embodiment, a case where it is applied to a single-cylinder type hydraulic shock absorber 1 provided with a free piston 9 and a gas chamber D between the bottom cap 2B of the cylinder 2 and the fixed valve 8 is taken as an example. explained. However, the present invention is not limited to this, and the cylinder may be configured to be applied to a double-cylinder type hydraulic shock absorber including an outer cylinder and an inner cylinder. This configuration is similarly applicable to other embodiments.

In the first embodiment, a case where a pair of arm portions 11B and a pair of claw portions 11C are provided on the first member 11 has been described as an example. However, the present invention is not limited to this, and the first member may be provided with three or more arms and claws. This configuration is similarly applicable to other embodiments.

In each embodiment, the case where the hydraulic shock absorber 1 is used to suppress the vibration acting on the building has been described as an example. However, the present invention is not limited to this, and alleviates vibrations of objects to be buffered, such as shock absorbers used in four-wheeled vehicles, two-wheeled vehicles and railroad vehicles, and shock absorbers used in various mechanical devices including general industrial equipment. It can also be applied to various shock absorbers.

As the shock absorber based on the embodiment described above, for example, the one described below can be considered.

As a first aspect of the shock absorber, a bottomed tubular cylinder in which fluid is sealed, a piston arranged in the cylinder and sliding, one end is connected to the piston, and the other end is one end of the cylinder. An engaging member provided between the piston rod protruding from the piston, a fixed valve fixed to the bottom side of the cylinder with respect to the piston, and the piston and the fixed valve, and fixing the piston in the vicinity of the fixed valve. The engaging member is attached to one of the piston rod or the fixed valve, and is attached to the first member having a hook-shaped tip and the other of the piston rod or the fixed valve. It has a second member whose outer peripheral portion is made of a circular plate material, and the first member and the second member are at least one of the first member and the second member when the piston rod approaches the fixed valve. After one is elastically deformed, it becomes engaged.

As a second aspect, in the first aspect, the first member is arranged on the piston rod and the second member is arranged on the fixed valve.

As a third aspect, in the first aspect, the first member is arranged on the fixed valve and the second member is arranged on the piston rod.

As a fourth aspect, in the first to third aspects, a closing member having one end of the cylinder closed and an end face portion located on one end side of the cylinder on the other end side of the other end side of the cylinder, and the above. It has a bracket that is fixed to a piston rod, extends toward the end face portion of the closing member, has a size that fits on the inner peripheral side of the cylinder, and has a plurality of holes formed therein.

1 Hydraulic shock absorber (buffer)
2 Cylinder 2A Open end (one end)
3 Piston 4 Piston rod 5 Rod guide (blocking member)
5B End face 6 Oil seal (blocking member)
7 Dust seal (blocking member)
8 Fixed valve 10,21 Engagement member 11,22,31 First member 11C, 22C, 31C Claw (uncinus)
12, 23 Second member 13 Bracket 13C Hole

Claims (4)

A bottomed cylindrical cylinder filled with fluid,
A piston that slides in the cylinder and
A piston rod having one end connected to the piston and the other end protruding from one end of the cylinder.
A fixed valve fixed to the bottom of the cylinder with respect to the piston,
It has an engaging member provided between the piston and the fixed valve and fixing the piston in the vicinity of the fixed valve.
The engaging member is attached to one of the piston rod and the fixed valve, and has a hook-shaped tip and a first member.
It has a second member attached to the other of the piston rod or the fixed valve and the outer peripheral portion of which is made of a circular plate material.
The first member and the second member are shock absorbers characterized in that when the piston rod approaches the fixed valve, at least one of them is elastically deformed and then engaged. The shock absorber according to claim 1.
The first member is arranged on the piston rod and
The second member is a shock absorber characterized in that it is arranged in the fixed valve. The shock absorber according to claim 1.
The first member is arranged in the fixed valve and
The second member is a shock absorber characterized in that it is arranged on the piston rod. The shock absorber according to any one of claims 1 to 3.
A closing member that closes one end of the cylinder and has an end face portion located on the other end side of the cylinder on the other end side of the other end side of the cylinder.
A buffer that is fixed to the piston rod, extends toward the end face portion of the closing member, has a size that fits on the inner peripheral side of the cylinder, and has a bracket having a plurality of holes formed therein. vessel.

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