JP2012072835A - Gas filling structure of hydraulic shock absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic shock absorber not exposing a gas filling opening of a gas filling section to the outside in which the gas filling section can be easily arranged in a cylinder or a piston rod, and gas pressure can be adjusted repeatedly using the gas filling opening in the actually using stage.SOLUTION: The gas filling structure of the hydraulic shock absorber 10 includes the cover member 55 nine (mounting collar 15) capable of switching and setting the opening 51A facing the outside of the gas filling opening 51 in which the rubber plug 53 is arranged to an opening position and an opposing position in the cylinder 11 in which the gas filling section 50 is arranged.

Description

  The present invention relates to a gas sealing structure of a hydraulic shock absorber.

  In a hydraulic shock absorber such as a motorcycle, a gas spring is formed by sealing a high-pressure gas such as air in an internal space of a cylinder to improve the riding comfort of the vehicle.

  Conventionally, as a gas sealing structure of a hydraulic shock absorber, there is one in which a gas sealing portion is provided on the outer periphery of a cylinder and high pressure air is sealed from a gas sealing port of the gas sealing portion. However, in the prior art, the gas filling port of the gas filling part is exposed to the outside, and the gas filling port may be damaged by collision with other members or mischief, and gas and oil in the cylinder may leak out.

  In view of this, conventional gas sealing structures in which the gas sealing port is not exposed to the outside have been proposed in Patent Documents 1 and 2.

  The hydraulic shock absorber described in Patent Document 1 uses a gas sealing jig. An auxiliary cylinder was fitted to the outer periphery of the opening end of the cylinder, a cap was fitted to the tip of the piston rod, and gas was supplied into the cylinder from a gas-filled plug built in the cap, and then provided around the cap The seal guide is pushed into the inner periphery of the opening end of the cylinder by a ram, and the outer periphery of the opening end of the cylinder is caulked and stopped around the seal guide by a caulking tool built in the auxiliary cylinder. The inner periphery of the opening end of the cylinder serving as the gas filling port is closed to the outside by the seal guide and is not exposed.

  In the hydraulic shock absorber described in Patent Document 2, a plug member is inserted into a gas filling port provided at the top of the cylinder so as to be able to fill the gas, and is plastically deformed so as to caulk the top of the cylinder after gas filling. The gas sealing port is completely closed, and a mounting hinge piece is welded to a region covering the plug member at the top of the cylinder to keep the cylinder in a completely gas-sealed state. The gas filling port is closed to the outside by the plug member and the mounting hinge piece, and is not exposed.

63-50509 6-37654

  In the gas sealing structure of the hydraulic shock absorber described in Patent Documents 1 and 2, although the gas sealing port is not exposed to the outside, there are the following problems.

  The gas sealing structure of the hydraulic shock absorber described in Patent Document 1 is such that a cap of a gas sealing jig is fitted to the tip of the piston rod, and a vehicle body side or axle side mounting member is provided at the tip of the piston rod. It is not applicable if

  Further, the gas sealing jig is composed of a large number of parts such as an auxiliary cylinder, a cap, a ram, and a caulking tool, and the configuration is complicated. Each of these parts needs to have a size corresponding to the cylinder diameter or piston rod diameter of the hydraulic shock absorber, and it is necessary to prepare various gas sealing jigs consisting of parts of appropriate sizes for each type of hydraulic shock absorber. is there.

  In addition, the gas sealing jig has the cylinder opening end outer periphery caulked with a seal guide that is pushed into the cylinder opening end inner periphery that was the gas sealing port after gas sealing, and this gas sealing port is then repeated repeatedly. Not available. Therefore, the gas pressure already sealed in the cylinder cannot be adjusted using the gas filling port at the actual use stage of the hydraulic shock absorber.

  Next, in the gas sealing structure of the hydraulic shock absorber described in Patent Document 2, the mounting hinge piece is welded to a region covering the plug member with the gas sealing port closed at the top of the cylinder after gas sealing. This gas filling port cannot be used repeatedly thereafter. Therefore, the gas pressure already sealed in the cylinder cannot be adjusted using the gas filling port at the actual use stage of the hydraulic shock absorber.

  An object of the present invention is to provide a hydraulic shock absorber that does not expose the gas filling port of the gas filling portion to the outside, and the gas filling portion can be simply provided on the cylinder or the piston rod, and the gas filling port is repeatedly used in the actual use stage. It is to make it possible to adjust the gas pressure.

  According to the first aspect of the present invention, a piston rod is slidably inserted into a cylinder, a gas sealing portion for sealing gas into the internal space of the cylinder is provided in the cylinder or piston rod, and a gas sealing portion is provided in the cylinder or piston rod. A cylinder or piston rod provided with a gas stopper, which is provided with a gas stopper by providing a rubber stopper at the gas inlet and allowing gas to be sealed through an injection needle inserted into the rubber stopper. In addition, a cover member that can be switched between an opening position and a closing position of the opening facing the outside of the gas filling port is provided.

  According to a second aspect of the present invention, in the first aspect of the present invention, the cover member is a mounting collar that is detachably provided on a cylinder body side or axle side mounting member, or a piston rod body side or axle side mounting. This is a mounting collar that is detachably provided on the member.

  The invention according to claim 3 is the invention according to claim 1, wherein the cover member is a cylindrical member of a spring load adjusting device that is detachably provided on the outer periphery of the cylinder or piston rod.

(Claim 1)
(a) Gas sealing by a rubber plug provided in the gas filling port provided in the cylinder (or piston rod) and a cover member provided in the cylinder (or piston rod) that opens and closes the opening facing the outside of the gas filling port. Can be configured.

The gas filling port of the gas filling part is not exposed to the outside by the cover member set at the closed position.
With the rubber plug and cover member provided on the cylinder (or piston rod), the gas sealing part can be easily provided on the cylinder (or piston rod).

  In the actual use stage, the cover member can be set at the open position of the gas filling port, and the injection needle can be inserted into the rubber stopper provided in the gas filling port. Can be adjusted.

  (b) Even if the gas sealed in the internal space of the cylinder tries to push the rubber stopper out of the gas inlet under high temperature and pressure, the rubber stopper is completely prevented by the cover member set in the closed position. The The rubber plug is not discharged as a small piece or the like from the gas filling port, and the gas filling port can be completely and stably sealed.

(Claim 2)
(c) The mounting collar that is detachably provided on the cylinder body or axle side mounting member or the mounting collar that is detachably provided on the piston rod body side or axle side mounting member is the above-mentioned (a), (b) Can also be used as a cover member. That is, by attaching the mounting collar to the mounting hole of the vehicle body side or the axle side mounting member, the opening facing the outside of the gas filling port can be closed. By removing the mounting collar from the mounting hole, an opening facing the outside of the gas filling port can be opened, and the injection needle can be pierced through a rubber stopper provided in the gas filling port.

(Claim 3)
(d) The cylindrical member of the spring load adjusting device that is detachably provided on the outer periphery of the cylinder (or piston rod) can also be used as the cover member of the above-described (a) and (b). That is, by attaching the cylindrical member of the spring load adjusting device, the opening facing the outside of the gas filling port can be closed. By removing the cylindrical member of the spring load adjusting device, the opening facing the outside of the gas filling port can be opened, and the injection needle can be inserted into the rubber stopper provided in the gas filling port.

FIG. 1 is a cross-sectional view showing a gas sealing structure of a first embodiment of a hydraulic shock absorber. FIG. 2 is a lower cross-sectional view of FIG. FIG. 3 is a top sectional view of FIG. FIG. 4 is a top front view of FIG. FIG. 5 is a cross-sectional view showing a gas sealing state using the gas sealing portion. FIG. 6 is a top sectional view showing a gas sealing structure of the hydraulic shock absorber according to the second embodiment. FIG. 7 is a cross-sectional view showing a gas sealing state using the gas sealing portion.

  In the hydraulic shock absorber 10 shown in FIG. 1, a piston rod 12 is slidably inserted into a cylinder 11, and a suspension spring 13 is interposed on the outside of the cylinder 11 and the piston rod 12.

  The cylinder 11 includes a vehicle body side mounting member 14. The vehicle body side mounting member 14 forms a closed end portion of the cylinder 11 and substantially constitutes a part of the cylinder 11. The vehicle body side mounting member 14 has a mounting hole 16 in which a mounting collar 15 (comprising a rubber collar 15A and a metal bush 15B) is detachably provided, and the vehicle body via a mounting pin (not shown) inserted into the mounting collar 15. Pivoted to the side.

  The piston rod 12 includes an axle side mounting member 17. The axle-side mounting member 17 is attached to the end of the piston rod 12 protruding from the cylinder 11, has an attachment hole 19 in which an attachment collar 18 similar to the attachment collar 15 is provided, and is attached to the attachment collar 18. It is pivotally supported on the axle side via a mounting pin (not shown).

  As shown in FIGS. 3 and 4, the hydraulic shock absorber 10 has a spring load adjusting device 20 on the outer periphery of the cylinder 11. The spring load adjusting device 20 uses the reduced-diameter cylindrical portion 14A of the vehicle body side mounting member 14 constituting a part of the cylinder 11 as a fixing member 21, and prevents the cylindrical member 22 from rotating on the outer periphery of the fixing member 21. It is attached in a slidable state in the axial direction, and stoppers 23 are provided at two circumferential positions on the outer periphery of the cylindrical member 22. The cylindrical member 22 is detachably provided on the outer periphery of the reduced diameter cylindrical portion 14A (fixing member 21) of the vehicle body side mounting member 14. A plurality of engaging portions 24A that selectively engage the stoppers 23 are provided in two circumferential regions on the upper surface of the spring support 24 that is rotatably fitted to the outer periphery of the cylindrical member 22. The plurality of engaging portions 24A have a cam shape in which their heights are sequentially changed. The spring support 24 includes a washer 25 and a spring receiver 26 on a flat surface on the lower surface.

  In the hydraulic shock absorber 10, a spring receiver 27 is provided on an axle side mounting member 17 provided on the piston rod 12. Thereby, the suspension spring 13 is interposed between the spring receiver 26 and the spring receiver 27 of the spring load adjusting device 20. The spring support 24 is rotated with respect to the cylindrical member 22, and the engagement portion 24A of the spring support 24 that engages with the stopper 23 of the cylindrical member 22 is changed, and suspension according to the height of the selected engagement portion 24A is performed. The spring load of the spring 13 is obtained. The impact force that the vehicle receives from the road surface is absorbed by the spring force of the suspension spring 13.

  As shown in FIG. 2, the hydraulic shock absorber 10 includes a rod guide 31 through which the piston rod 12 penetrates at the other end opening of the cylinder 11. The rod guide 31 allows the piston rod 12 to slide in a liquid-tight manner on an inner diameter portion including an oil seal 32 and the like. The piston rod 12 is provided with a pressure side bumper 33 outside the rod guide 31, and at the time of the maximum compression, the pressure side bumper 33 is abutted against a bumper stopper 34 provided in the piston rod 12 to restrict the maximum compression stroke. In addition, the cylinder 11 includes an extension side bump rubber 35 inside the rod guide 31.

  The hydraulic shock absorber 10 has a piston valve device 40. The hydraulic shock absorber 10 suppresses expansion and contraction vibration of the cylinder 11 and the piston rod 12 due to the absorption of the impact force by the suspension spring 13 by the damping force generated by the piston valve device 40.

  The piston valve device 40 has a piston 41 fixed to the end of the piston rod 12 inserted into the cylinder 11. The piston 41 partitions the inside of the cylinder 11 into a piston side oil chamber 42A and a piston rod side oil chamber 42B. The piston 41 has a pressure side channel 43 and an extension side channel 44 (not shown) that connect the piston side oil chamber 42A and the piston rod side oil chamber 42B. The pressure side channel 43 includes a pressure side valve 43A, and the extension side The flow path 44 is provided with an expansion side valve 44A.

  The piston valve device 40 includes an air chamber 45 (gas chamber) above the piston-side oil chamber 42 </ b> A inside the cylinder 11. The air chamber 45 is filled with pressurized air (or other gas such as nitrogen gas) to form an air spring (gas spring), and compensates the volume of the piston rod 12 entering and leaving the cylinder 11. A partition member such as a free piston or a bladder may be interposed between the piston-side oil chamber 42A and the air chamber 45.

Therefore, the hydraulic shock absorber 10 performs a damping action as follows.
(When compressed)
The oil in the piston side oil chamber 42A flows to the rod side oil chamber 42B through the pressure side flow path 43, and this oil bends and deforms the pressure side valve 43A to obtain a pressure side damping force. At the same time, the oil corresponding to the volume of the piston rod 12 that has entered the cylinder 11 compresses the air chamber 45.

(When stretched)
The oil in the rod side oil chamber 42B passes through the extension side flow path 44, bends and deforms the extension side valve 44A, flows to the piston side oil chamber 42A, and obtains the extension side damping force. At this time, the oil corresponding to the retraction volume of the piston rod 12 retreating from the cylinder 11 expands the air chamber 45.
The expansion and contraction vibration of the hydraulic shock absorber 10 is suppressed by the damping force on the compression side and the extension side.

  However, in the hydraulic shock absorber 10, the gas sealing portion 50 that seals the pressurized air into the air chamber 45 inside the cylinder 11 is the cylinder 11, and in this embodiment, the vehicle body side mounting member 14 that is a part of the cylinder 11. Is provided.

  The gas sealing part 50 is on the central axis of the cylinder 11 in the vehicle body side mounting member 14 and on the diameter of the mounting hole 16 in which the mounting collar 15 in the vehicle body side mounting member 14 is attached and detached. Is drilled. The gas filling port 51 extends from the outside of the vehicle body side mounting member 14 toward the air chamber 45 in the cylinder 11 through the mounting hole 16, and a portion facing the air chamber 45 is a large diameter hole-like rubber plug storage portion 52. The rubber plug storage portion 52 is loaded with a rubber plug 53. As shown in FIG. 5, the mounting collar 15 is not provided in the mounting hole 16 of the vehicle body side mounting member 14, and is inserted into the gas filling port 51 from the outside of the vehicle body side mounting member 14, and eventually inserted into the rubber plug 53. Pressurized air is sealed through the injection needle 54 that reaches the air chamber 45. A high pressure air source is connected to the injection needle 54.

  In the gas sealing part 50, a cover member 55 is provided in an opening 51A facing the outside of the gas sealing port 51 (in this embodiment, an opening 51A facing the mounting hole 16 of the gas sealing port 51). The cover member 55 can be switched between a position for opening and closing the opening 51A of the gas filling port 51.

  In the present embodiment, as the cover member 55, an attachment collar 15 that is detachably provided on the vehicle body side attachment member 14 of the cylinder 11 is also used.

Therefore, according to the present embodiment, the following operational effects can be obtained.
(a) The gas sealing portion 50 is formed by a rubber plug 53 provided in the gas sealing port 51 provided in the cylinder 11 and a cover member 55 provided in the cylinder 11 for opening and closing the opening 51A facing the outside of the gas sealing port 51. Can be configured.

  The gas filling port 51 of the gas filling unit 50 is not exposed to the outside by the cover member 55 set at the closed position.

  The gas sealing portion 50 can be easily provided in the cylinder 11 by the rubber plug 53 and the cover member 55 provided in the cylinder 11.

  In the actual use stage, the cover member 55 is set at the opening position of the gas filling port 51, and the injection needle 54 can be pierced through the rubber stopper 53 provided in the gas filling port 51. The gas pressure can be adjusted by repeated use.

  (b) Even if the gas sealed in the internal space of the cylinder 11 tries to push the rubber plug 53 outward from the gas filling port 51 under high temperature and high pressure, the rubber plug 53 is closed by the cover member 55 set at the closed position. , Is completely retained. The rubber plug 53 is not discharged as a small piece or the like from the gas filling port 51, and it is possible to keep the gas filling port 51 completely and stably hermetically sealed.

  (c) The mounting collar 15 detachably provided on the vehicle body side mounting member 14 of the cylinder 11 can also be used as the cover member 55 of the above-described (a) and (b). That is, by attaching the attachment collar 15 to the attachment hole 16 of the vehicle body attachment member 14, the opening 51 </ b> A facing the outside of the gas filling port 51 can be closed. By removing the mounting collar from the mounting hole 16, the opening 51 </ b> A facing the outside of the gas filling port 51 can be opened, and the injection needle 54 can be inserted into the rubber stopper 53 provided in the gas filling port 51.

  The hydraulic shock absorber 10 shown in FIG. 6 is different from the hydraulic shock absorber 10 shown in FIGS. 1 to 4 in that the gas sealing part 50 is changed to a gas sealing part 60.

  That is, the gas sealing portion 60 provided in the hydraulic shock absorber 10 of FIG. 6 is on the horizontal axis orthogonal to the central axis of the cylinder 11 in the vehicle body side mounting member 14 and the cylindrical member 22 of the spring load adjusting device 20 is attached and detached. A hole-shaped gas filling port 61 is formed on the horizontal axis passing through the outer periphery. The gas filling port 61 extends from the outside of the vehicle body side mounting member 14 toward the air chamber 45 in the cylinder 11, and a portion facing the air chamber 45 is a large-diameter hole-shaped rubber plug storage portion 62. The part 62 is loaded with a rubber plug 63. As shown in FIG. 7, the cylinder member 22 is not provided on the outer periphery of the vehicle body side mounting member 14, and is inserted into the gas filling port 61 from the outside of the vehicle body side mounting member 14, and then pierced by the rubber plug 63. Pressurized air is sealed through the injection needle 64 reaching 45.

  In the gas sealing part 60, a cover member 65 is provided in the opening 61 </ b> A facing the outside of the gas sealing port 61. The cover member 65 can be switched between a position for opening and closing the opening 61 </ b> A of the gas filling port 61.

  In the present embodiment, as the cover member 65, the cylindrical member 22 of the spring load adjustment device 20 detachably provided on the outer periphery of the cylinder 11 is also used.

Therefore, according to the present embodiment, the following operational effects can be obtained.
(a) The gas sealing portion 60 is formed by a rubber plug 63 provided in the gas sealing port 61 provided in the cylinder 11 and a cover member 65 provided in the cylinder 11 for opening and closing the opening 61A facing the outside of the gas sealing port 61. Can be configured.

  The gas filling port 61 of the gas filling unit 60 is not exposed to the outside by the cover member 65 set at the closed position.

  The gas sealing portion 60 can be easily provided in the cylinder 11 by the rubber plug 63 and the cover member 65 provided in the cylinder 11.

  In the actual use stage, the cover member 65 is set to the opening position of the gas filling port 61, and the injection needle 64 can be inserted into the rubber plug 63 provided in the gas filling port 61. The gas pressure can be adjusted by repeated use.

  (b) Even if the gas sealed in the internal space of the cylinder 11 tries to push the rubber plug 63 outward from the gas sealing port 61 under high temperature and high pressure, the rubber plug 63 is closed by the cover member 65 set at the closed position. , Is completely retained. The rubber plug 63 is not discharged as a small piece or the like from the gas filling port 61, and the gas filling port 61 can be kept completely and stably hermetically sealed.

  (c) The cylindrical member 22 of the spring load adjusting device 20 detachably provided on the outer periphery of the cylinder 11 can be used as the cover member 65 of the above-described (a) and (b). That is, by attaching the cylindrical member 22 of the spring load adjusting device 20, the opening 61A facing the outside of the gas filling port 61 can be closed. By removing the cylindrical member 22 of the spring load adjusting device 20, the opening 61 </ b> A facing the outside of the gas filling port 61 can be opened, and the injection needle 64 can be inserted into the rubber plug 63 provided in the gas filling port 61. .

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention.

  The present invention provides a gas sealing port in which a piston rod is slidably inserted into a cylinder, a gas sealing portion for sealing gas into the internal space of the cylinder is provided in the cylinder or piston rod, and the gas sealing portion is provided in the cylinder or piston rod. A rubber stopper is provided with a rubber stopper, and a gas sealing structure of a hydraulic shock absorber that enables gas to be sealed through an injection needle inserted into the rubber stopper. A cover member that can be switched between the opening position and the closing position of the opening facing the outside of the entrance is provided. As a result, in the hydraulic shock absorber that does not expose the gas filling port of the gas filling portion to the outside, the gas filling portion can be simply provided on the cylinder or the piston rod, and the gas filling port is repeatedly used in the actual use stage. The gas pressure can be adjustable.

DESCRIPTION OF SYMBOLS 10 Hydraulic shock absorber 11 Cylinder 12 Piston rod 14 Car body side attachment members 15 and 18 Attachment collars 16 and 19 Attachment hole 17 Axle side attachment member 20 Spring load adjusting device 22 Cylinder member 50 Gas enclosure part 51 Gas enclosure part 51A Opening part 52 Rubber Stopper housing portion 53 rubber stopper 54 injection needle 55 cover member 60 gas sealing portion 61 gas sealing port 61A opening 62 rubber stopper storage portion 63 rubber stopper 64 injection needle 65 cover member

Claims (3)

Insert the piston rod slidably into the cylinder,
A cylinder or piston rod is provided with a gas enclosure that encloses gas in the internal space of the cylinder,
A gas sealing structure of a hydraulic shock absorber in which a gas sealing part is provided in a gas sealing port provided in a cylinder or a piston rod, and gas can be sealed through an injection needle pierced by the rubber plug,
A gas sealing structure for a hydraulic shock absorber, wherein a cover member that can be switched between a position for opening and closing an opening facing the outside of a gas sealing port is provided on a cylinder or piston rod provided with a gas sealing portion.   The cover member is an attachment collar that is detachably provided on a vehicle body side or axle side attachment member of a cylinder, or an attachment collar that is detachably provided on a vehicle body side or axle side attachment member of a piston rod. Gas enclosure structure of hydraulic shock absorber.   The gas sealing structure for a hydraulic shock absorber according to claim 1, wherein the cover member is a cylindrical member of a spring load adjusting device that is detachably provided on an outer periphery of a cylinder or a piston rod.

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