JP2012031953A - Cylinder device and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assembling performance, by holding a ball being an engaging body by a clutch member, when assembling a cylinder device.SOLUTION: A piston 12 connected with a piston rod 2 is fitted to a cylinder member 3, and the piston rod 2 is energized by a coil spring 27 via a clutch member 24. When the projecting length of the piston rod 2 is less than a predetermined value, the ball 26 engages with an inner peripheral clutch groove 18 and fixes a holding member 24 to a guide sleeve 17, and spring force is not made to act on the piston rod 2 by releasing the piston rod 2. When the projecting length of the piston rod 2 is the predetermined length or more, the ball 26 engages with an outer peripheral clutch groove 23 and releases the clutch member 24 from the guide sleeve 17, and the spring force is made to act on the piston rod 2 by being fixed to the piston rod 2. In assembling, the assembling performance is improved by holding the ball 26 by the clutch member 24 by a viscous agent.

Description

  The present invention relates to a cylinder device used for a door closer or the like that assists in opening and closing a door, and a manufacturing method thereof.

  A cylinder device such as a spring damper is linked to the hinged door, and the door is automatically closed and the closing speed is adjusted by applying spring force and damping force to the opening and closing of the door. There is known a door closer that holds the door in an open position. Conventionally, as a door closer using a cylinder device such as this type of spring damper, there is one described in Patent Document 1, for example.

For example, in the cylinder device described in Patent Document 1, a clutch means is provided between a piston rod and a spring, and a spring force is applied to the piston rod according to its extended position by engaging and disengaging the ball and groove. It can be released. This increases the degree of freedom in setting the spring force that acts on the door when used as a door closer.

JP 2009-299453 A

  The cylinder device described in Patent Document 1 has a problem that the process of assembling a plurality of balls constituting the clutch means and the holding means for holding the balls is complicated.

  It is an object of the present invention to provide a cylinder device and a method for manufacturing the same that solve the above problems.

In order to solve the above problems, a cylinder device according to the present invention includes a cylinder member, a sliding member that slides within the cylinder member, an outer peripheral clutch groove provided on an outer peripheral portion of the sliding member, An inner peripheral clutch groove provided on the inner peripheral side of the cylinder member so as to face the outer peripheral clutch groove, an engaging body that engages with at least one of the outer peripheral clutch groove and the inner peripheral clutch groove, and the engaging body A clutch member that is movably guided along the radial direction of the cylinder member,
At least when the clutch member is assembled, a holding means for holding the engaging body is provided on the clutch member.
The present invention also provides a cylinder member, a sliding member that slides in the cylinder member, an outer peripheral clutch groove provided on an outer peripheral portion of the sliding member, and the cylinder member facing the outer peripheral clutch groove. An inner circumferential clutch groove provided on the inner side of the inner circumferential groove, an engagement body that engages with at least one of the outer circumferential clutch groove and the inner circumferential clutch groove, and a cylindrical shape that extends radially along the side wall of the engagement body. And a clutch member having a plurality of guide holes into which a guide hole is inserted.
A step of inserting the engagement body into the guide hole of the clutch member, and supplying a viscous agent having viscosity to the guide hole from the inner peripheral side of the clutch member, and the engagement body is held in the guide hole by the viscosity agent And a step of inserting the clutch member holding the engaging body into the outer periphery of the sliding member.

  According to the present invention, a cylinder device in which a clutch means is provided on a sliding member such as a piston rod can be easily assembled.

It is a longitudinal cross-sectional view of the cylinder apparatus which concerns on one Embodiment of this invention. In the cylinder apparatus of FIG. 1, the piston rod is shortened and the enlarged longitudinal cross-sectional view of the principal part which shows the state which the spring force of a spring mechanism is not acting on a piston rod. It is explanatory drawing which shows the state which mounted | wore the door with the cylinder apparatus of FIG. 1 in planar view. It is a figure which shows the assembly process of the cylinder apparatus of FIG. It is a schematic longitudinal cross-sectional view of the ball | bowl assembly | attachment apparatus for loading a ball | bowl with the clutch member of the cylinder apparatus of FIG. It is a longitudinal cross-sectional view which expands and shows the holding member which is the principal part of the modification of the cylinder apparatus of FIG.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
A cylinder device according to the present embodiment is shown in FIG. 1, and an essential part thereof is enlarged and shown in FIG. 2. As shown in FIGS. 1 and 2, the cylinder device 1 is a so-called spring damper that applies a repulsive force to the piston rod 2, and is an opening of a substantially bottomed cylindrical cylinder member 3 that constitutes the cylinder. A rod guide 4 which is a bearing that slides with a piston rod 2 whose inner periphery is a sliding member is inserted at the end, and the rod guide 4 is fixed by caulking the opening end of the cylinder member 3. Has been. Inside the rod guide 4, an oil seal 5 made of rubber that seals between the inside and the outside of the cylinder member 3 and in which a metal ring is embedded is mounted.

  Further, an intermediate guide 6 as a partition member is attached to the inside of the intermediate portion of the cylinder member 3, and the inside of the cylinder member 3 is connected to the cylinder portion 7 on the bottom side and the rod guide portion 8 on the opening side by the intermediate guide 6. It is divided into and. A passage 6 </ b> A that connects the cylinder portion 7 and the rod guide portion 8 is passed through the intermediate guide 6 in the axial direction. The intermediate guide 6 is fixed by fitting into the cylinder member 3 and caulking the side wall of the cylinder member 3 inward. The intermediate guide 6 may be a bearing that slides with the piston rod 2 in the same manner as the rod guide 4. However, in this case, the concentricity between the rod guide 2 and the intermediate guide 6 needs to be increased. The guide 6 is more manufacturable when its inner diameter is larger than that of the rod guide 4. A free piston 9 is slidably fitted into the cylinder portion 7, and the inside of the cylinder portion 7 is partitioned by the free piston 9 into a gas chamber 10 on the bottom side and a cylinder chamber 11 on the intermediate guide 6 side.

  The piston rod 2 is inserted into the cylinder member 3 through the rod guide 4 and the oil seal 5 so as to be slidable and fluid-tight. The proximal end side of the piston rod 2 extends through the intermediate guide 6 to the inside of the cylinder chamber 11, and the piston 12 is connected to the distal end portion thereof. The piston 12 is slidably fitted to the cylinder portion 7, and an O-ring 13 is mounted on the outer periphery thereof. The cylinder chamber 11 has a rod side chamber 11A on the intermediate guide 6 side and a bottom side chamber 11B on the free piston 9 side. It is divided into two rooms. The cylinder chamber 11 and the rod guide portion 8 are filled with hydraulic fluid, and the gas chamber 10 is filled with a low-pressure gas of about atmospheric pressure. The gas of about atmospheric pressure is a gas introduced into the gas chamber 10 when the piston rod 2 shown in FIG. Therefore, at the time of use, it may be higher than atmospheric pressure depending on temperature conditions and the like.

  The gas pressure may be slightly higher depending on the required characteristics of the cylinder device 1, but if the gas pressure is high, a slight spring force is generated in the free section described later. A gas pressure with a smaller force than the friction on the mounting side such as a door is desirable. Alternatively, the gas chamber 10 may be open to the atmosphere. In this case, it is desirable to provide a filter for preventing the entry of foreign matter in the hole opened to the atmosphere.

  The piston 12 has a communication passage 14 extending in the axial direction that allows the rod side chamber 11 </ b> A and the bottom side chamber 11 </ b> B to communicate with each other. A damping force generation mechanism 15 is provided in the communication passage 14. The damping force generation mechanism 15 is a disc-like valve body that is attached to the end surface of the piston 12 on the rod side chamber 11A side and opens and closes the communication path 14, and its central portion is axially between the reduced diameter portions 2a of the rod 2 Is slidably inserted (about 1.5 mm). As a result, the communication passage 14 is normally closed and functions as a check valve that allows only the flow of hydraulic fluid from the bottom side chamber 11B to the rod side chamber 11A. Further, the damping force generating mechanism 15 is provided with an orifice composed of a small hole, a notch or the like that allows the bottom side chamber 11B and the rod side chamber 11A to communicate with each other at all times.

  The rod guide portion 8 is provided with a spring mechanism 16 that applies a spring force to the piston rod 2. The configuration of the spring mechanism 16 will be described below. A cylindrical guide sleeve 17 is inserted into the rod guide portion 8 of the cylinder member 3, and both end portions thereof are in contact with the oil seal 5 and the intermediate guide 6 and are fixed in the axial direction. An inner circumferential clutch groove 18 that is an inner circumferential groove is formed in an intermediate portion of the guide sleeve 17. The guide sleeve 17 is divided into two in the axial direction at the end of the inner peripheral clutch groove 18 on the side of the intermediate guide 6 in consideration of the workability of the inner peripheral clutch groove 18, and the two first guide sleeves 17A and the second guide The first guide sleeve 17 </ b> A on the oil seal 5 side is formed with a recess that becomes the inner peripheral clutch groove 18. The guide sleeve 17 is preferably made of metal in terms of strength, but a reinforced synthetic resin may be used for weight reduction.

  The first and second guide sleeves 17A and 17B have an outer diameter slightly smaller than the inner diameter of the rod guide portion 8 of the cylinder member 3, and the first and second guide sleeves 17A and 17B have outer peripheries near both ends. Grooves 19 and 20 are formed, and O-rings 21 and 22 are fitted in the outer peripheral grooves 19 and 20, respectively. Thereby, the first and second guide sleeves 17 </ b> A and 17 </ b> B have a slight gap between the first and second guide sleeves 17 </ b> A and 17 </ b> B and are elastically supported via the O-rings 21 and 22.

  The piston rod 2 is formed with an outer peripheral clutch groove 23, which is an outer peripheral groove, in the middle portion facing the guide sleeve 17. The inner circumferential clutch groove 18 and the outer circumferential clutch groove 23 are substantially equal in depth, and their axial ends are tapered.

  A cylindrical clutch member 24 is slidably guided between the guide sleeve 17 and the piston rod 2 along the axial direction. A plurality of ball holes 25, which are guide holes arranged radially at equal intervals along the radial direction, pass through the side wall of the clutch member 24. In each ball hole 25, a ball 26 (steel ball), which is a rolling element serving as an engaging body, is guided so as to be movable along the axial direction of the ball hole 25 (the radial direction of the clutch member 24). The diameter of the ball 26 is substantially equal to the diameter of the ball hole 25 and is substantially equal to the sum of the thickness of the clutch member 24 and the depth of the inner peripheral clutch groove 18 (equal to the depth of the outer peripheral clutch groove 18). . Thus, the ball 26 is always engaged with the outer peripheral clutch groove 23 of the piston rod 2 (see FIG. 1) or the guide when the clutch member 24 is inserted between the guide sleeve 17 and the piston rod 2. The sleeve 17 is engaged with the inner peripheral clutch groove 18 (see FIG. 2). The clutch member 24 that is a holding member for the ball 26 and the ball 26 constitute a clutch means that engages and disengages with the piston rod 2.

  A coil spring 27 (compression spring) as a spring means is interposed between the intermediate guide 6 and the clutch member 24, and the clutch member 24 is constantly urged toward the oil seal 5 by the spring force. . A cylindrical spring receiving portion 28 is formed concentrically and integrally on one end portion of the clutch member 24, and one end portion of the coil spring 27 is fitted to the outer periphery of the spring receiving portion 28 and coupled to the clutch member 24. Has been. A cylindrical spring receiving portion 29 is formed concentrically and integrally on one end of the intermediate guide 6, and the other end of the coil spring 27 is fitted to the outer periphery of the spring receiving portion 29 so that the intermediate guide 6. Thus, by positioning the both ends of the coil spring 27 by the spring receiving portions 28 and 29, the coil spring 27 can be smoothly expanded and contracted. The tip portions of the spring receiving portions 28 and 29 of the clutch member 24 and the intermediate guide 6 are formed in a taper shape, and when the coil spring 27 expands and contracts, the wire material constituting the coil spring 27 is applied to the spring receiving portions 28 and 29. I try not to interfere. Thereby, generation | occurrence | production of the noise by interference of a wire can be prevented, positioning the coil spring 27 reliably.

  Attachment portions 30 and 31 for linking the cylinder device 1 are attached to the bottom portion of the cylinder member 3 and the distal end portion of the piston rod 2 on the protruding side, and the shapes of these attachment portions 30 and 31 are as follows. It can be made into the shape matched with to-be-attached members, such as a door.

Next, the operation of the cylinder device configured as described above will be described.
FIG. 3 is an explanatory diagram viewed from above an example of the hinged door 60 to which the cylinder device 1 is mounted. As shown in FIG. 3, the door 60 is a door frame 61 attached to a door frame 61 by a hinge 62 so that the door 63 can be opened and closed. Reference numeral (A) in FIG. (C) shows a fully open position opened approximately 90 ° from the closed position (A), and (B) shows an intermediate position between the closed position (A) and the fully opened position (C) (approximately from the closed position (A)). 45 ° open position).

  The cylinder device 1 is configured such that the mounting portion 30 on the cylinder member 3 side is pivotally coupled to a bracket 64 fixed to the door frame 61 side, and the mounting portion 31 on the piston rod 2 side is fixed to the door 63 side. It can be used as a door opening / closing device that assists in opening and closing of the door 63 by being pin-coupled to 65 and mounted on the hinged door 60. At this time, the piston rod 2 has the maximum extension length when the door 63 is in the closed position (A) or the fully open position (C), and the extension length is minimum when the door 63 is in the intermediate position (B). In position, the hinge 62 of the hinged door 60 is on an extension of the axis of the cylinder device 1.

  Referring to FIG. 3, when the door 63 is within a predetermined range in the opening / closing direction from the intermediate position (B), the protruding length of the piston rod 2 from the cylinder member 3 is within a predetermined range from the minimum position. At this time, as shown in FIG. 2, the outer peripheral clutch groove 23 of the piston rod 2 is on the intermediate guide 6 side with respect to the inner peripheral clutch groove 18 of the guide sleeve 17. In this state, the ball 26 inserted into the ball hole 25 of the clutch member 24 engages with the inner peripheral clutch groove 18 of the guide sleeve 17 and contacts the outer peripheral surface of the piston rod 2 to move radially inward. Being restricted, the clutch member 24 is fixed to the guide sleeve 17 in the axial direction, and the movement of the piston rod 2 in the axial direction is allowed. As a result, the spring force of the coil spring 27 is supported by the clutch member 24 fixed in the axial direction with respect to the guide sleeve 17 by the ball 26, and does not act on the piston rod 2. This range is called a free section.

  On the other hand, as the piston rod 2 expands and contracts, the piston 12 moves and the hydraulic fluid in the cylinder chamber 11 flows through the communication passage 14, whereby a damping force is applied by the damping force generation mechanism 15. At this time, during the extension stroke of the piston rod 2, the damping force generation mechanism 15 functions as an orifice to generate a predetermined damping force with respect to the flow of hydraulic fluid from the rod side chamber 11A side to the bottom side chamber 11B side of the communication passage 14. appear. Further, during the contraction stroke, the damping force generation mechanism 15 allows the flow of hydraulic fluid from the bottom side chamber 11B side to the rod side chamber 11A side of the communication path 14 to reduce the damping force.

  In the above-described free section, the spring force of the coil spring 27 does not act on the expansion and contraction of the piston rod 2, but only the damping force mainly due to the movement of the piston 12 acts. In addition, the gas in the gas chamber 10 is compressed and expanded due to the volume change in the cylinder chamber 11, but the pressure in the gas chamber 10 hardly affects expansion and contraction of the piston rod 2 because the gas chamber 10 has a low pressure of about atmospheric pressure. Thus, in the free section, the piston rod 2 can be freely expanded and contracted with little resistance, so that the door 63 can be freely moved in both open and close directions.

  When the door 63 is moved beyond the free section to the closed position (A) or near the fully open position (C), the piston rod 2 is extended as shown in FIG. It moves to the oil seal 5 side over the inner peripheral clutch groove 18. At this time, when the protruding length of the piston rod 2 from the cylinder member 3 reaches a predetermined length and the outer peripheral clutch groove 23 of the piston rod 2 passes through the inner peripheral clutch groove 18 of the guide sleeve 17, the inner peripheral clutch groove 18 is engaged with the outer peripheral clutch groove 23 of the piston rod 2 and the clutch member 24 is released from the axial fixation with respect to the guide sleeve 17. And is fixed in the axial direction with respect to the piston rod 2. As a result, the spring force of the coil spring 27 acts on the piston rod 2 via the clutch member 24 to urge the piston rod 2 in the extending direction. As a result, when the door 63 is in the vicinity of the closed position (A), the door 63 automatically moves to the closed position (A). When the door 63 is in the vicinity of the fully open position (C), the door 63 automatically moves to the fully open position (C). It will be moved and held. Such a section is called an energizing section.

  In this urging section, the damping force generating mechanism 15 functions as an orifice to generate a predetermined damping force with respect to the extension of the piston rod 2, so that the moving speed of the door 63 is moderately reduced. The impact and noise when the door 63 is opened and closed can be reduced.

  When the protrusion length of the piston rod 2 from the cylinder member 3 becomes a predetermined length and the above-described free section and urging section are switched, the ball 26 moves to the inner peripheral clutch groove 18 of the guide sleeve 17 or the outer periphery of the piston rod 23. By engaging the clutch groove 23, some hitting sound is generated. On the other hand, the guide sleeves 17A and 17B are elastically supported by the O-rings 21 and 22 and are not in direct contact with the cylinder member 3, so that the hitting sound transmitted to the cylinder member 3 is reduced and noise is reduced. Occurrence can be suppressed.

Next, a method for manufacturing the cylinder device 1 will be described mainly with reference to FIGS.
First, as shown in FIG. 4A, the piston rod 2 to which the attachment portion 31 is attached is inserted into the rod guide 4, the oil seal 5 and the first guide sleeve 17A to assemble them. The balls 26 are loaded into the four ball holes 25 of the clutch member 24. At this time, a viscous agent having an appropriate viscosity or adhesiveness is applied to at least one of the ball 26 and the ball hole 25. Thereby, the ball 26 can be held in the ball hole 25 of the clutch member 24.

  This viscous agent has a property that does not adversely affect the movement of the ball 26 in the ball hole 25 in a state where the clutch member 24 and the ball 26 are incorporated in the cylinder device 1. As the viscous agent, for example, grease that acts as a lubricant after assembly and does not adversely affect the hydraulic fluid in the cylinder member 3 is desirable. Alternatively, the clutch member 24 and the ball 26 are temporarily bonded and held at the time of assembly, but an adhesive that loses adhesiveness in the hydraulic fluid in the cylinder member 3 may be used after assembly.

  Next, as shown in FIG. 4B, the clutch member 24 holding the ball 26 with a viscous agent is inserted into the first guide sleeve 17A while the piston rod 2 is inserted. In this state, even if the viscosity and adhesiveness of the viscosity agent are lost, the ball 26 does not fall off. Then, the coil spring 27, the second guide sleeve 17B, the intermediate guide 6, the damping force generation mechanism 15 and the piston 12 are assembled while the piston rod 2 is inserted, and the piston 12 is coupled to the end of the piston rod 2. Thereafter, the assembly in which these are assembled is inserted into the cylinder member 3, and the intermediate guide 6 is fixed by caulking the side wall of the cylinder member 3 inward.

  As described above, since the ball 26 is held in the ball hole 25 of the clutch member 24 by the viscous agent, the clutch member 24 holding the ball 26 can be easily assembled to the first guide sleeve 17A. Assembling workability of 1 can be improved.

Next, a ball assembling apparatus 70 for loading and holding the balls 26 on the clutch member 24 will be described with reference to FIG.
As shown in FIG. 5, the ball assembling apparatus 70 includes a substantially bottomed cylindrical sleeve member 71 and a shaft-like insertion jig 72 erected at the center of the bottom portion 71 </ b> A in the sleeve member 71. ing. The cylindrical portion 71B of the sleeve member 71 and the insertion jig 72 are disposed concentrically, and the insertion jig 72 has a tapered tip end portion 72A protruding from the cylindrical portion 71B.

  The insertion jig 72 has an outer diameter slightly smaller than the inner diameter of the clutch member 24 and can be easily inserted into the clutch member 24. The inner diameter of the cylindrical portion 71B of the sleeve member 71 is slightly larger than the outer diameter of the clutch member 24, and the clutch member 24 can be easily inserted. Furthermore, the difference D between the inner peripheral radius of the cylindrical portion 71 </ b> B of the sleeve member 71 and the outer peripheral radius of the insertion jig 72 is slightly larger than the diameter of the ball 26. Thus, when the clutch member 24 is inserted between the insertion jig 72 and the cylindrical portion 71B of the sleeve member 71 with the balls 26 loaded and held in the four ball holes 25, the axial direction and the rotational direction Can be moved to.

  The insertion jig 72 includes four balls of the clutch member 24 in a state where the clutch member 24 shown in FIG. 5 is inserted into the cylindrical portion 71B of the sleeve member 71 and brought into contact with the bottom portion 71A (hereinafter referred to as a set state). Viscous agent passages 73 that extend radially so as to open to portions facing the holes 25 are formed. The viscous agent passage 73 is further extended along the axis of the insertion jig 72 and connected to the viscous agent supply means S. The viscous agent supply means S supplies the viscous agent to the viscous agent passage 73 manually or by operation of a pump, a cylinder device or the like.

  A cylindrical ball feeding path 74 that can communicate with the ball hole 25 of the clutch member 24 in the above-described set state is provided on the upper portion of the cylindrical portion 71B of the sleeve member 71. The ball member 25 can be loaded into the ball hole 25 through the ball feeding path 74 by rotating the clutch member 24 in the set state to cause the ball hole 25 to communicate with the ball feeding path 74.

Next, a process of loading and holding the balls 26 in the four ball holes 25 of the clutch member 24 using the ball assembling apparatus 70 will be described.
First, the clutch member 24 is inserted into the insertion jig 72 and the cylindrical portion 71B of the sleeve member 71 and brought into contact with the bottom portion 71A to be in a set state. At this time, since the distal end portion 72A of the insertion jig 72 protruding from the cylindrical portion 71B is sharpened in a tapered shape, the clutch member 24 can be easily inserted.

  Next, the plurality of balls 26 are inserted into the ball feeding path 74 and the clutch member 24 is rotated. Thereby, when the ball hole 25 of the clutch member 24 and the ball feeding path 74 communicate with each other, the ball 26 drops into the ball hole 25 and is loaded. Then, by further rotating the clutch member 24, the balls 26 are sequentially loaded into the four ball holes 25. After the balls 26 are loaded into the four ball holes 25 of the clutch member 24, the ball holes 26 are communicated with the viscous agent passage 73, and the viscous agent is supplied by the viscous agent supply means S. Thereby, the viscous agent is injected into the gap between the ball hole 25 and the ball 26 loaded in the ball hole 25 through the viscous agent passage 73. At this time, by shifting the positions of the ball hole 25 and the ball feeding path 74, it is possible to prevent the ball 26 from returning to the ball feeding path 74 due to the pressure of the viscosity agent. Thereafter, the clutch member 24 is removed from the ball assembling apparatus 70. In this manner, the balls 26 can be loaded into the four ball holes 25 of the clutch member 24, and the balls 26 can be held in the ball holes 25 by the viscous agent.

  The viscous agent of the present invention is necessary for holding the ball 26 in the ball hole 25, and does not need to act to assist sliding when the ball 26 slides on the guide sleeve 17A. This is because when the ball 26 slides on the guide sleeve 17A, the hydraulic oil in the cylinder member 3 serves to assist sliding. Therefore, the viscous agent may be a material that dissolves in the oil liquid in the cylinder.

Next, another embodiment of the holding means for holding the ball in the ball hole 25 of the clutch member 24 will be described mainly with reference to FIG.
As shown in FIG. 6, in the present embodiment, as the holding means, a plurality of protruding portions 74 are formed on the inner peripheral edge portions at both ends of the ball hole 25 without using a viscous agent. The protrusion 74 has an inner diameter slightly smaller than the outer diameter of the ball 26, and the clutch member 24 bends so that the ball 26 can be press-fitted into the ball hole 25. After being loaded into the ball 26, the ball 26 can be held in the ball hole 25 by contacting the ball 26. Further, the ball 26 loaded in the ball hole 26 can move in the radial direction of the clutch member 24 between the projecting portions 74 (see the phantom line in FIG. 6), and the inner peripheral clutch groove 23 and the first guide of the piston rod 2. The outer periphery clutch groove 18 of the sleeve 17A can be engaged. A plurality of protrusions 74 may be formed on the inner peripheral edge of the ball hole 25 at an appropriate interval, or may be formed over the entire periphery of the inner peripheral edge of the ball hole 25 (see reference numeral 74A).

  As a result, in the assembly process of the cylinder device 1, the clutch member 24 holding the four balls 26 can be easily assembled to the first guide sleeve 17A. Can improve sex

  In the above-described embodiment and other embodiments, the clutch member 24 is selectively attached to the guide sleeve 17 or the piston rod 2 by engaging with the inner clutch groove 18 and the outer clutch groove 23 instead of the ball 26. Other rolling elements such as rollers, or engaging bodies such as cam members that slide without rolling may be used as long as they can be fixed to the roller.

  In the above embodiment and other embodiments, the damping force is obtained by narrowing the flow path area through which the hydraulic fluid flows. However, like a so-called friction damper, the damping force is obtained by friction between the piston and the cylinder. Any other structure may be used as long as it can generate a damping force. Moreover, gas can also be used as a working fluid instead of a working fluid. However, it can be expected that the most stable damping force can be obtained by using the working fluid as the working fluid.

  DESCRIPTION OF SYMBOLS 1 Cylinder apparatus, 2 Piston rod (sliding member), 3 Cylinder member, 18 Inner periphery clutch groove, 23 Outer periphery clutch groove, 24 Clutch member, 26 Ball (engagement body)

Claims (10)

A cylinder member, a sliding member that slides in the cylinder member, an outer peripheral clutch groove provided in an outer peripheral portion of the sliding member, and an inner peripheral side of the cylinder member facing the outer peripheral clutch groove An inner circumferential clutch groove, an engagement body that engages with at least one of the outer circumferential clutch groove and the inner circumferential clutch groove, and a clutch member that guides the engagement body to move along the radial direction of the cylinder member. With
A cylinder device comprising a holding means for holding the engaging body on the clutch member when at least the clutch member is assembled. The cylinder device according to claim 1, wherein the holding unit is a viscous agent having viscosity. The cylinder device according to claim 2, wherein the viscous agent is grease. The cylinder device according to claim 1, wherein the holding unit is a protruding portion that is formed on the clutch member and abuts against the engaging body. 5. The clutch member according to claim 1, wherein the clutch member has a cylindrical shape, and a plurality of guide holes are formed in a side wall thereof so as to extend in a radial direction and into which the engaging body is inserted. Cylinder device. A cylinder member, a sliding member that slides in the cylinder member, an outer peripheral clutch groove provided in an outer peripheral portion of the sliding member, and an inner side of the cylinder member that faces the outer peripheral clutch groove An inner peripheral clutch groove; an engaging body that engages with at least one of the outer peripheral clutch groove and the inner peripheral clutch groove; and a plurality of cylindrical bodies that extend in the radial direction on the side wall and are inserted into the engaging body. A method of manufacturing a cylinder device including a clutch member in which a guide hole is formed,
A step of inserting the engagement body into the guide hole of the clutch member, and supplying a viscous agent having viscosity to the guide hole from the inner peripheral side of the clutch member, and the engagement body is held in the guide hole by the viscosity agent And a step of inserting the clutch member holding the engaging body into the outer periphery of the sliding member. A cylinder member that contains a working fluid, a piston rod that slides within the cylinder member, and a spring mechanism;
The spring mechanism includes an outer peripheral clutch groove provided on an outer peripheral portion of the piston rod, an inner peripheral clutch groove provided on the inner side of the cylinder member so as to face the outer peripheral clutch groove, and the cylinder member of the piston rod. The piston rod engages with the outer peripheral clutch groove and is fixed in the axial direction with respect to the piston rod and is movable in the axial direction with respect to the cylinder. When the length of the cylinder member moved with respect to the cylinder member is less than a predetermined length, it engages with the inner circumferential clutch groove and is fixed in the axial direction with respect to the cylinder and in the axial direction with respect to the piston rod. Including clutch means that is movable, and spring means that biases the clutch means,
The clutch means includes an inner peripheral surface provided with the inner peripheral clutch groove on the cylinder member side in an engaged state with at least one of the outer peripheral clutch groove and the inner peripheral clutch groove, and an outer peripheral surface of the piston rod. A plurality of engaging bodies inserted between them, and a clutch member that guides the engaging bodies movably along the radial direction of the cylinder member,
A cylinder device comprising a holding means for holding the engaging body on the clutch member when at least the clutch member is assembled. The clutch member is cylindrical, has a plurality of guide holes extending in the radial direction on the side wall thereof, and the engaging body is inserted therein. As the holding means, a viscous agent having viscosity is applied to the guide. The cylinder device according to claim 7. The clutch member is cylindrical and has a plurality of guide holes that extend in the radial direction on the side wall thereof and into which the engagement body is inserted, and as the holding means, a protrusion that contacts the engagement body in the guide hole The cylinder device according to claim 7, wherein a portion is provided. A cylinder member in which hydraulic oil is stored; a piston rod having a piston that slides within the cylinder member; an outer peripheral clutch groove provided on an outer peripheral portion of the piston rod; An inner circumferential clutch groove provided on the inner circumferential side of the cylinder member, an engagement body engaging with at least one of the outer circumferential clutch groove and the inner circumferential clutch groove, and the engagement body along the radial direction of the cylinder member. Clutch means for guiding the movement,
The clutch means includes an inner peripheral surface provided with the inner peripheral clutch groove on the cylinder member side in an engaged state with at least one of the outer peripheral clutch groove and the inner peripheral clutch groove, and an outer peripheral surface of the piston rod. A plurality of engaging bodies inserted between the clutch body and a clutch member that guides the engaging bodies movably along a radial direction of the cylinder member;
A cylinder device characterized in that grease is applied to the clutch member.

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