KR101745653B1 - Damper of closer - Google Patents

Abstract

The present invention is characterized in that a working fluid is filled in the inside, first and second sealing portions are provided at both ends for sealing, and a connecting flow passage is formed in the first sealing portion so as to connect the central portion and the edge of the side facing the piston A damping housing part; A piston inserted through the second sealing portion and inserted into the damping housing portion, the head being provided to receive a pressure of the working fluid; Wherein the head is divided into first and second spaces which are fixed to the inside of the damping housing part so that the head is inserted inside and the inner space is in contact with each of the first and second sealing parts sides by the head, And a main flow passage connected to a center portion of the connection passage and connecting the edge portion of the connection passage to the second space, the main passage being connected to the center portion of the connection passage, A damping chamber provided; And a unidirectional control unit provided in the piston, the unidirectional control unit causing the working fluid to move in one direction between the first and second spaces when the piston is in motion.
According to the present invention, it is possible not to require a relatively high precision by not using a complicated configuration, thereby making it easy to manufacture and to reduce the manufacturing cost. Further, And it is possible to accurately control the resistance of the working fluid.

Description

[0001] Damper of closer [0002]

The present invention relates to a damping device for a closure, and more particularly, to a damping device for a closure, which is easy to manufacture and reduces manufacturing cost, improves the reliability of the accurate intermittent operation of the working fluid and the reliability of the damping action, To a closure damping device.

Generally, the closer is installed on a door or the like. When the door is rotated and opened and the force applied to the door is removed, the door rotates and closes by itself. Such a closure includes a damping device for generating a damping force by a working fluid and a torsion device for generating a restoring force by a spring.

As such a damping device of a closure is disclosed in Korean Patent Laid-Open No. 10-2012-0124938 entitled " Rotary Type Damper ", which comprises a housing filled with a working fluid; A shaft rotatably installed through the inside of the housing; A housing pin provided on an inner circumferential surface of the housing to reach the side of the shaft, the housing pin restricting movement of the working fluid; And an axle pin coupled to the shaft to rotate together with the shaft, the shaft pin being brought into close contact with a side portion of the shaft and an inner circumferential surface of the housing by varying an attitude according to a rotation direction of the shaft.

However, in the conventional technology as described above, it is difficult to control the operation of the housing pin and the axle pin at the time of manufacture. Therefore, it is difficult to precisely control the resistance of the working fluid. And the like.

In addition, such a conventional technique requires a high degree of precision in the process of manufacturing the component including the housing pin and the axial fin in manufacturing, resulting in difficulty in fabrication and increase in cost, There is a problem that not only an easy assembling structure is presented, but also it is difficult to realize this.

In order to solve the problems of the prior art as described above, the present invention does not require a complicated structure such as a conventional housing pin and an axial pin, so that a relatively high precision is not required, The aim is to reduce the production cost.

It is also an object of the present invention to improve the accuracy of the intermittent operation of the working fluid and the reliability of the damping action, and precisely control the resistance of the working fluid.

Other objects of the present invention will become readily apparent from the following description of the embodiments.

In order to achieve the above object, according to one aspect of the present invention, there is provided an internal combustion engine comprising: an internal chamber filled with a working fluid, both ends of which are provided with first and second sealing portions for sealing, A damping housing part having a connecting channel connecting the center part and the edge of the damping housing part; A piston inserted through the second sealing portion and inserted into the damping housing portion, the head being provided to receive a pressure of the working fluid; Wherein the head is divided into first and second spaces which are fixed to the inside of the damping housing part so that the head is inserted inside and the inner space is in contact with each of the first and second sealing parts sides by the head, And a main flow passage connected to a center portion of the connection passage and connecting the edge portion of the connection passage to the second space, the main passage being connected to the center portion of the connection passage, A damping chamber provided; And a unidirectional control unit provided on the piston, the unidirectional control unit causing the working fluid to move in one direction between the first and second spaces when the piston is in motion.

The damping housing part may be screwed to the first sealing part such that a damping adjusting bolt for adjusting the degree of opening and closing of the connecting passage is exposed to the outside.

The connection passage includes a first connection passage formed at a center of the first seal portion to be connected to the first space; At least one second connection passage formed from the first connection passage to an edge of the first seal portion; And a third connection passage formed along an edge of the first sealing portion on a side where the damping chamber contacts the second connection passage.

Wherein the main passage includes a connection hole formed at a side of the damping chamber to connect the second space with the outside; And a channel groove formed along the longitudinal direction on the outer surface of the damping chamber to connect the connection hole and the edge side of the connection channel.

The damping chamber may have at least one regulating passage for moving the working fluid between the first and second spaces by bypassing the head to the inner circumferential surface.

Wherein the one-way control unit comprises: a control flow passage formed to connect the first and second spaces to the piston; And a check valve installed in the control passage and allowing unidirectional movement from the first space to the second space.

According to the damping device of the closure according to the present invention, since a complicated configuration is not used, a relatively high precision can be not required, thereby making it easy to manufacture and to reduce the manufacturing cost, The reliability of the intermittent and damping actions can be improved, and the resistance of the working fluid can be accurately controlled.

1 is an exploded perspective view showing a closure according to one embodiment of the present invention.
Figure 2 is a perspective view illustrating a hinge device with a closure in accordance with one embodiment of the present invention.
3 is a cross-sectional view of a closure according to one embodiment of the present invention, showing the closure in a closed state;
4 is an exploded perspective view illustrating a housing portion of a damping device of a closure according to one embodiment of the present invention.
5 is a perspective view of a damping chamber and piston of a damping device of a closure according to an embodiment of the present invention.
6 is a perspective view illustrating a damping chamber of a damping device of a closure according to one embodiment of the present invention.
7 is an exploded perspective view illustrating a torsion device of a closure according to one embodiment of the present invention.
8 is a perspective view illustrating a torsion housing portion of a torsion device of a closure according to one embodiment of the present invention.
9 is an exploded perspective view showing a rotary motion converting unit of a closure torsion device according to an embodiment of the present invention.
10 is a cross-sectional view showing a state in which the closure is opened at 45 degrees according to an embodiment of the present invention.
11 is a cross-sectional view showing a state in which a closure according to an embodiment of the present invention is opened at 90 degrees.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in detail in the drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention, And the scope of the present invention is not limited to the following examples.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant explanations thereof will be omitted.

Figure 1 is an exploded perspective view of a closure according to one embodiment of the present invention, Figure 2 is a perspective view illustrating a hinge device with a closure in accordance with one embodiment of the present invention, Figure 3 is a perspective view of an embodiment of the present invention Fig. 5 is a cross-sectional view showing a closure according to the present invention. Fig.

1 to 3, a closure damping apparatus 100 according to an embodiment of the present invention is provided in the closure 10 and includes a damping housing unit 110, a piston 120, a damping chamber 130 And a one-way control unit 140. [ Closure damping device 100 according to one embodiment of the present invention may be used in conjunction with torsion device 200 wherein elastic energy is accumulated by the opening force of the door and the force applied to the door The damping device 100 of the closure provides the damping force through the torsion device 200 to adjust the closing speed of the door.

Closure damping apparatus 100 according to one embodiment of the present invention includes first and second housings 311 and 321 arranged in a line so as to be rotatable relative to each other in hinge apparatus 300 together with, for example, Respectively. The damping device 100 of the closure may be installed at one side of the first and second housings 311 and 321, for example, at one side of the first housing 311, and the torsion device 200 may be provided with a torsion- And the first and second housings 311 and 321, respectively.

In this embodiment, the hinge device 300 may include a pair of hinges, for example, first and second hinges 310 and 320. Here, the first hinge 310 may be provided on the first housing 311 with a first wing 312 for fixing the first hinge 310 to either the door or the door frame with screws or bolts. The second hinge 320 may be provided on the second housing 321 with a second wing 322 to be fixed to the other one of the door or the door frame by screws or bolts. The first housing 311 may be located at either end of the second housing 321, or may be located between a plurality of second housings 321, for example, two, such as two, as in the present embodiment .

Referring to FIGS. 1, 3 and 4, the damping housing part 110 is filled with a working fluid, for example, oil, and first and second sealing parts 111 and 112 are provided at both ends for sealing, 1 connecting ports 113, 114 and 115 for connecting the central portion and the edge of the sealing portion 111 on the side facing the piston 120 are formed. Here, the first sealing part 111 may be detachably fixed to the inside of one end of the damping housing part 110 by screwing. The second sealing portion 112 may be detachably fixed to the inside of the other end of the damping housing portion 110 by screwing, and a through hole may be provided for the piston 120 to pass therethrough. In addition, a sealing member such as an O-ring or the like may be installed in the first and second sealing portions 112 to maintain airtightness at the connection portion with other structures. Such a sealing member such as an O-ring can be provided in a portion requiring sealing at the closure 10 as well.

The damping housing part 110 may be screwed to the first sealing part 111 such that the damping adjusting bolt 116 for adjusting the opening and closing degree of the connecting flow paths 113, 114 and 115 is exposed to the outside. The damping housing part 110 may be formed with a locking step 117 to be engaged with the first housing 311.

The connection flow paths 113, 114 and 115 include a first connection path 113 formed at the center of the first sealing part 111 to be connected to the first space 131 and a second connection path 113 extending from the first connection path 113 to the first sealing part 111 At least one second connection passage 114 formed to extend to an edge of the damping chamber 130 and an edge of the damping chamber 130 in contact with the damping chamber 130 so as to be connected to the second connection passage 114 And a third connection passage 115 connected to the second connection passage 115. Here, the second connection passage 114 may be branched from the first connection passage 113 into a plurality of, for example, three, and connected to the third connection passage 115. The third connection passage 115 may be formed in the shape of a ring-like groove along the edge at the corner of the end of the first sealing portion 111.

The damping control bolt 116 may be screwed to the first sealing portion 111 so as to be in line with the first connecting flow path 113. The amount of opening and closing of the first and second connecting flow paths 113 and 114 The damping force can be adjusted by adjusting the amount of the working fluid passing therethrough. A straight groove, a cross groove or a wrench groove can be formed for the insertion of the jig during rotation.

Referring to FIGS. 1, 3 and 5, the piston 120 is inserted into the damping housing part 110 through the second sealing part 112, and the head 121 . The piston 120 is reciprocated integrally with the sliding member 230 by engaging the engaging portion 122 provided at the end of the rod with the sliding member 230 of the torsion device 200 and being fixed by bolts or the like.

3, 5 and 6, the damping chamber 130 is fixed to the inside of the damping housing part 110 so that the head 121 is inserted into the inside, The first space 131 is divided into a first space 131 and a second space 131 which are in contact with the first and second hermetically sealed portions 111 and 112. The first space 131 is connected to the center of the connection flow paths 113, The main flow paths 133 and 134 for connecting the third connection flow path 115 and the second space 132 to each other are formed at the edges of the connection flow paths 113, 114 and 115, Thereby providing a working fluid passage between the second spaces 131 and 132.

The main flow channels 133 and 134 include a connection hole 133 formed at the side of the damping chamber 130 to connect the second space 132 to the outside as well as a connection hole 133 and connection channels 113, And a flow path groove 134 formed to extend along the longitudinal direction on the outer surface of the damping chamber 130 to connect the edge side of the damping chamber 130, for example, the third connection flow path 115 with each other.

The damping chamber 130 may include at least one or more control flow paths 135 and 136 to allow the working fluid to move between the first and second spaces 131 and 132 by bypassing the head 121 to the inner peripheral surface. A plurality of control flow paths 135 and 136 may be formed as in the present embodiment and two actuating valves 135 and 136 may be formed in the damping chamber 130 such that when the head 121 of the piston 120 moves within the damping chamber 130, The fluid moves from the first space 131 to the second space 132 or vice versa by bypassing the head 121. [ The control flow channels 135 and 136 allow adjustment of the damping force or the closing speed of each section with respect to the open / close region of the door corresponding to the position of the head 121 in the damping chamber 130. The control flow paths 135 and 136 are formed to have a length greater than the thickness of the head 121. The control flow paths 135 and 136 are formed in the damping chamber 130 in consideration of the position of the head 121, Can be determined. Further, the control flow paths 135 and 136 may be formed so that some of them overlap with each other, as another example, they may be formed to overlap each other, or as another example, they may not be overlapped with each other, The cross-sectional area can be determined in consideration of the amount of bypass of the working fluid necessary for the adjustment.

1, 3 and 5, the unidirectional control unit 140 is provided on the piston 120, and when the piston 120 moves, the working fluid moves between the first and second spaces 131 and 132 in one direction For example, as in the present embodiment, the door may be installed to move in one direction from the first space 131 to the second space 132 in the direction of reducing the damping force when the door is opened. The unidirectional control unit 140 includes control flow paths 141 and 142 formed to connect the first and second spaces 131 and 132 to the piston 120 and control flow paths 141 and 142 connected to the first space 131 and the control flow paths 141 and 142, And a check valve 143 that allows only one-way movement from the first space 132 to the second space 132. The control flow paths 141 and 142 include a first control flow path 141 formed to extend from the center of the end of the head 121 to the inside of the piston 120 and a second control flow path 141 extending from the end of the first control flow path 141 to the side of the piston 120 And a second control flow path 142 formed to be opened to a predetermined temperature. The first control flow passage 141 is connected to the first space 131 and the second control flow passage 142 is connected to the second space 132 regardless of the position of the piston 120. [ The check valve 143 can be installed in the first control flow path 141 by screwing or interference fit, and the movement direction of the working fluid is limited by the ball elastically supported by the spring, To open and close in one direction.

Referring to FIGS. 1, 3 and 7, the torsion device 200 includes a torsion housing part 210, a spring 220, a sliding member 230, a rotating member 240, and a rotary motion converting part 250 .

3, 7 and 8, the torsion housing unit 210 is fixed to one of the hinges 300, for example, the first hinge 310, and one end is blocked, and the sliding member 230 A plurality of sliding grooves 211 may be formed on the inner circumferential surface along the longitudinal direction so that the sliding grooves 212 are formed on the inner circumferential surface. And a tension adjusting bolt 213 for adjusting the tension of the spring 220 is screwed according to the amount of rotation. The tension adjusting bolt 213 is rotated by the rotation of the torsion housing part 210 to adjust the compression amount or the elasticity of the spring 220 by the rotation of the torsion housing part 210, And a groove for jig coupling such as a straight groove, a cross groove or a wrench groove can be formed for rotation.

The torsion housing unit 210 is inserted into the first housing 311 of the first hinge 310 fixed to either the door or the frame by screws or bolts by the first wing 312 in the hinge unit 300. [ At least one or more fixing protrusions 214 may be formed on the outer surface of the first housing 311 so as to be fixed to the first housing 311 in an integrated manner by being fitted into fixing grooves formed on the inner side of the first housing 311 And a latching jaw 215 may be formed at the end of the first housing 311 to fix the installation position by being hooked when the first housing 311 is inserted.

Referring to FIGS. 1, 3 and 7, the spring 220 is installed inside the torsion housing part 210 to provide an elastic force in the longitudinal direction. The spring 220 may be a coil compression spring as in the present embodiment. And the other end thereof may be supported by the sliding member 230. As shown in FIG.

The sliding member 230 is installed to be capable of reciprocating in the longitudinal direction in a state where the rotation of the sliding member 230 is restrained within the torsion housing unit 210 while the piston 120 of the damping device 100 is reciprocated Lt; / RTI > The sliding member 230 is formed with a plurality of sliding protrusions 231 for sliding engagement with the respective sliding grooves 211 so as to be reciprocally movable in a state in which the rotation is inhibited from the torsion housing portion 210 . The sliding member 230 may be formed with a coupling hole 232 to be engaged with the coupling portion 122 provided at the end of the piston 120 so as to be integrally formed with each other, And the engaging portion 122 at the end of the engaging portion 120 may be fixed.

The rotary member 240 is installed on the outer side of the piston 120 and is fitted to the sliding member 230 so as to be able to rotate relative to the sliding member 230. In the state where the movement in the longitudinal direction is restricted, And is fixed to the other hinge of the hinge device 300, for example, the second hinge 320. The hinge device 300 may be mounted on the hinge device 300, The rotary member 240 rotates relative to the sliding member 230 when the door is rotated. The rotary member 240 is rotated by a bolt, a screw or the like by the second wing 322 on the other of the door and the door frame in the hinge device 300 At least one fixing protrusion 241 for fixing the second hinge 320 to the fixing groove of the second housing 321 may be provided on the outer surface.

The rotation member 240 may be formed with an insertion portion 242 to be inserted into the sliding member 230. The insertion portion 242 may be formed on the sliding member 230 in the reverse direction. A washer 243 may be interposed between the second sealing portion 112 of the damping device 100 and the washer 243 may be inserted into the piston 120 and installed in the second housing 321 have. The relative rotation of the rotary member 240 is also applied to the case where the first hinge 310 of the hinge device 300 is fixed to the door side and the second hinge 320 is fixed to the door frame side, All of the cases where the hinge 310 is fixed to the door frame side and the second hinge 320 is fixed to the door side are considered. For example, the rotary member 240 is coupled to the door side by the hinge device 300 When the torsion housing part 210 is coupled to the door frame by the hinge device 300, the rotary member 240 may be coupled to the door frame by the hinge device 300, The rotation member 240 may be rotated relative to the torsion housing part 210 when considering both of them when the hinge device 300 is coupled to the door by the hinge device 300. [

3, 7, and 9, the rotary motion converting unit 250 may include a guide protrusion 223 and a guide protrusion 223 which are inclined in the reciprocating direction to any one of the sliding member 230 and the rotary member 240, And the other one of the guide grooves 251 is engaged with the guide protrusion 251 so that the guide groove 252 is inclined in the reciprocating direction. Thus, the rotation of the rotary member 240 and the linear movement of the sliding member 230 It converts the movements to each other. The rotary motion converting unit 250 may include a plurality of, for example, two guide protrusions 251 along the outer circumferential surface of the fitting portion 242 of the rotary member 240, and the guide grooves 252 may be formed on the guide protrusions 251 For example, two at the portion where the fitting portion 242 is fitted in the sliding member 230 so as to correspond to the opening portion 242. [

The sliding member 230 may be formed with a plurality of detent protrusions 233 along the edge thereof so that the door protrusion 251 detached from the guide groove 252 is caught to stop the door from being closed until an external force is applied.

The operation of the closure damping device according to the present invention will now be described.

As shown in FIG. 3, the first and second hinges 310 and 320 (shown in FIGS. 1 and 2) of the hinge device 300 that mediates the installation of the door to the door frame are closed by the door, An elastic force is applied to the sliding member 230 from the spring 220 of the torsion device 200 and a force applied from the sliding member 230 is transmitted to the rotary motion converting unit 250 (shown in FIGS. 7 and 8) To the rotary member 240 to maintain the closed state of the door. At this time, the guide protrusions 251 (shown in Figs. 7 and 8) of the rotary motion converting unit 250 are positioned in the guide grooves 252 (shown in Figs. 7 and 8).

10, when the door is opened at about 45 degrees by applying a force to the door, the first and second hinges 310 and 320 (shown in FIGS. 1 and 2) of the hinge device 300 are rotated at an angle of 45 degrees with respect to each other The opening force of the door causes the rotary member 240 fixed to the second housing 321 of the second hinge 320 to rotate relative to the sliding member 230, 7 and 8) of the rotary motion converting portion 250 is moved along the guide groove 252 (shown in Figs. 7 and 8) by the rotation of the sliding member 230 Causes the spring 220 to start to linearly compress the spring 220, thereby causing the spring 220 to begin to accumulate more elastic force.

At this time, the piston 120 of the damping device 100 moves together with the sliding member 230 to start the compression of the working fluid toward the second space 132 by the piston 120. At this time, 132 are connected to the main flow paths 133, 135 and the connection flow paths 113, 114, 115, that is, the connection hole 133 and the flow path groove 134, the third connection flow path 115, the second connection flow path 114, The first control flow path 141 and the second control flow path 141 by the opening of the check valve 143. The control flow paths 141 and 142 are connected to the first control flow path 141, 142 are sequentially moved from the first space 131 to the second space 132 by passing the working fluid sequentially. The door is relatively easily opened by the one-way controller 140. On the other hand, the position of the piston 120 in which the door is opened at 45 degrees shows a small movement with respect to the position in the closed state of the door, which depends on the predetermined inclination or curvature of the guide projection 251 and the guide groove 252 , And may be designed differently as needed.

As shown in FIG. 11, when the first and second hinges 310 and 320 (shown in FIGS. 1 and 2) are opened at 90 degrees by the continuous opening of the door, The pressing force of the spring 220 and the movement of the working fluid become larger and the elastic force by the compression of the spring 220 is applied to the sliding member 230 and the rotary member 240 to return the door to close .

The elastic force accumulated in the spring 220 causes the sliding member 230 to linearly move back and the guide protrusion 251 of the rotary motion converting unit 250 moves the guide groove 252 So that the rotary member 240 is rotated to close the door. At this time, the piston 120 moves together with the sliding member 230 to compress the working fluid toward the first space 132, so that the working fluid in the first space 131 flows through the connecting passages 113, 114 and 115 and the main passages 133 and 135 Through the first to third connection flow paths 113, 114 and 115 and the flow path groove 134 and the connection hole 133 to move to the second space 132. At this time, Thereby blocking the movement of the working fluid through the control flow passages 141 and 142 so that the damping force is properly transmitted to the door.

The sliding member 230 is moved by the relative rotation of the rotary member 240 and the sliding member 230 to compress the spring 220 when the door is opened by the hinge device 300, The relative rotation of the sliding member 230 and the rotary member 240 causes the door to be closed by the return of the sliding member 230 by the spring 220 when the applied force is released. At this time, the working fluid is compressed by the movement of the piston 120 moving together with the sliding member 230 so that the working fluid in the damping device 100 flows between the first and second spaces 131 and 132 through the flow passages 113, 114, 115, 133, 134, 141, Moving through all or part will cause damping forces.

The damping force of the damping device 100 can be adjusted for each section by the control flow passages 135 and 136 provided to bypass the head 121 of the piston 120 to the damping chamber 130. As a result, Can be controlled for each section.

Although the present invention has been described with reference to the accompanying drawings, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

100: damping device 110: damping housing part
111: first sealing part 112: second sealing part
113, 114, 115: connecting flow path 116: damping adjusting bolt
117: latching jaw 120: piston
121: head 122:
130: damping chamber 131: first space
132: second space 133, 134:
135.136: Controlling channel 140: One-
141, 142: Control channel 143: Check valve
200: Torsion device 210: Torsion housing part
211: sliding groove 212: screw groove
213: tension adjusting bolt 214: fixing projection
215: latching jaw 220: spring
230: Sliding member 231: Sliding projection
232: coupling hole 233: stopping projection
240: Rotating member 241: Fixing projection
242: fitting portion 243: washer
250: rotational motion converting unit 251: guide projection
252: guide groove 300: hinge
310: first hinge 311: first housing
312: first wing 320: second hinge
321: second housing 322: second wing

Claims (6)

A damping housing part in which a working fluid is filled on the inner side, first and second sealing parts are provided on both ends for sealing, and a coupling flow path connecting the central part and the edge of the first sealing part toward the piston is formed;
A piston inserted through the second sealing portion and inserted into the damping housing portion, the head being provided to receive a pressure of the working fluid;
Wherein the head is divided into first and second spaces which are fixed to the inside of the damping housing part so that the head is inserted inside and the inner space is in contact with each of the first and second sealing parts sides by the head, And a main flow passage connected to a center portion of the connection passage and connecting the edge portion of the connection passage to the second space, the main passage being connected to the center portion of the connection passage, A damping chamber provided; And
A unidirectional control unit provided in the piston and allowing the working fluid to move in one direction between the first and second spaces when the piston is in motion;
Lt; / RTI >
The damping housing part
And a damping adjusting bolt for adjusting a degree of opening and closing of the connecting passage is screwed to the first sealing portion so as to be exposed to the outside. delete The method according to claim 1,
The connection channel
A first connection channel formed at a central portion of the first closed portion to be connected to the first space;
At least one second connection passage formed from the first connection passage to an edge of the first seal portion; And
A third connection passage formed along an edge of the first sealing portion on a side contacting the damping chamber to be connected to the second connection passage;
The damping device comprising: The method according to claim 1,
The main flow path,
A connection hole formed at a side of the damping chamber to connect the second space with the outside; And
A channel groove formed along an outer surface of the damping chamber along a longitudinal direction to connect the connection hole and an edge side of the connection channel;
Wherein the damping device comprises: The method according to claim 1 or 4,
Wherein the damping chamber comprises:
Wherein at least one regulating passage is formed on the inner circumferential surface so that the working fluid moves between the first and second spaces by bypassing the head. The method according to claim 1,
The one-
A control channel formed to connect the first and second spaces to the piston; And
A check valve installed in the control passage and allowing unidirectional movement from the first space to the second space;
The damping device comprising:

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