WO2018225711A1 - Dispositif cylindre - Google Patents

Dispositif cylindre Download PDF

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Publication number
WO2018225711A1
WO2018225711A1 PCT/JP2018/021508 JP2018021508W WO2018225711A1 WO 2018225711 A1 WO2018225711 A1 WO 2018225711A1 JP 2018021508 W JP2018021508 W JP 2018021508W WO 2018225711 A1 WO2018225711 A1 WO 2018225711A1
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WO
WIPO (PCT)
Prior art keywords
piston
cylinder
stopper
piston rod
castle
Prior art date
Application number
PCT/JP2018/021508
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English (en)
Japanese (ja)
Inventor
眞人 末廣
Original Assignee
日立オートモティブシステムズ株式会社
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Publication date
Application filed by 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Publication of WO2018225711A1 publication Critical patent/WO2018225711A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/58—Stroke limiting stops, e.g. arranged on the piston rod outside the cylinder

Definitions

  • the present invention relates to a cylinder device that is mounted on a vehicle such as a four-wheeled vehicle and is preferably used for buffering vibration of the vehicle.
  • a hydraulic shock absorber as a cylinder device is provided between each wheel (axle) side and the vehicle body in order to buffer the vibration of the vehicle (see, for example, Patent Document 1).
  • This type of cylinder device is provided with a hydraulic stopper mechanism that prevents the rod from extending and contracting by generating a hydraulic cushion action when the piston rod is fully extended.
  • the cylinder device is configured such that the piston ring constituting the stopper mechanism is assembled in a ring groove formed between the first member and the second member in a retaining state.
  • the first member and the second member need to be integrated with each other using a means such as metal flow (plastic flow) in a state where the piston ring is assembled to the ring structure, thereby increasing productivity.
  • metal flow plastic flow
  • An object of the present invention is to provide a cylinder device capable of improving the workability when the components of the stopper mechanism are assembled to the piston rod.
  • a cylinder device includes a first cylinder in which a working fluid is sealed, a first piston that is slidably provided in the first cylinder and partitions the first cylinder, and the first cylinder.
  • a piston rod connected to one piston, a rod guide provided on one end side of the first cylinder to guide the piston rod so as to be slidable, and the piston rod extends or contracts in the first cylinder
  • a stopper mechanism that operates when reaching the end of the The stopper mechanism is A second cylinder provided at an end in the first cylinder; A second piston that moves along with the movement of the piston rod and that can be inserted inside the second cylinder;
  • the second piston is A first member coupled to the piston rod;
  • a second member that is integrated with the first member by press-fitting and forms a ring groove between the first member and an outer periphery of the second piston;
  • a piston ring that is axially displaceable in the ring groove formed by the first member and the second member, is attached in a retaining state, and has both
  • a hydraulic shock absorber 1 is a double-tube shock absorber that is a typical example of a cylinder device.
  • the hydraulic shock absorber 1 includes a cylindrical outer cylinder 2 forming an outer shell thereof, an inner cylinder 5, a piston 6, a piston rod 7, a rod guide 9, and a stopper mechanism 11 which will be described later.
  • one side or one end side in the length direction (axial direction) of the shock absorber will be described as the upper side or the upper end side, and the other side or other end side in the axial direction will be described as the lower side or the lower end side.
  • this is only for simplifying and clarifying the description of the drawings, and does not limit the present invention.
  • the upper end side of the outer cylinder 2 of the hydraulic shock absorber 1 is an open end, and the lower end side is a closed end closed by a bottom cap (not shown).
  • a caulking portion 2 ⁇ / b> A formed by bending inward in the radial direction is provided on the open end (upper end) side of the outer cylinder 2.
  • the caulking portion 2 ⁇ / b> A holds the lid 3 in a state of being prevented from being removed on the opening end side of the outer cylinder 2. Thereby, the lid 3 closes the opening end side of the outer cylinder 2.
  • the lid 3 is formed as a metal annular disk, for example.
  • the lid 3 is in contact with a rod guide 9 described later from above and closes the open end (upper end) of the outer cylinder 2, and the outer peripheral side thereof is fixed by the caulking portion 2 ⁇ / b> A of the outer cylinder 2.
  • a rod seal 4 made of an elastic material is attached to the inner peripheral side of the lid 3.
  • the rod seal 4 seals between a piston rod 7 and a lid 3 which will be described later.
  • the rod seal 4 is provided with a later-described check valve 4 ⁇ / b> A at a position which is intermediate in the radial direction between the lid 3 and the rod guide 9.
  • the check valve 4 ⁇ / b> A may be formed as a separate member from the rod seal 4.
  • the inner cylinder 5 as the first cylinder is provided coaxially in the outer cylinder 2.
  • the lower end side of the inner cylinder 5 is fitted and fixed to the bottom cap side via a bottom valve (not shown).
  • the upper end side of the inner cylinder 5 is a cylindrical diameter-enlarged portion 5 ⁇ / b> A that is formed to expand radially outward.
  • a rod guide 9 described later is fitted and attached to the inner periphery on the upper end side of the enlarged diameter portion 5A.
  • working oil (oil liquid) as a working fluid is sealed.
  • the working fluid is not limited to working oil and oil, and for example, water mixed with additives can be used.
  • An annular reservoir chamber A is formed between the inner cylinder 5 and the outer cylinder 2, and gas is sealed in the reservoir chamber A together with the hydraulic oil.
  • This gas may be atmospheric pressure air or a compressed gas such as nitrogen gas.
  • the gas in the reservoir chamber A is compressed to compensate for the entry volume of the piston rod 7 when the piston rod 7 is contracted (contraction stroke).
  • the first piston (hereinafter referred to as piston 6) is slidably inserted into the inner cylinder 5.
  • the piston 6 partitions the inside of the inner cylinder 5 (first cylinder) into two chambers, and defines a bottom side oil chamber B and a rod side oil chamber C.
  • oil passages 6 ⁇ / b> A and 6 ⁇ / b> B capable of communicating the bottom side oil chamber B and the rod side oil chamber C are formed in the piston 6.
  • an extension-side disc valve 6D is provided that generates a predetermined damping force by applying a resistance force to the hydraulic oil flowing through the oil passage 6B in the extension stroke of the piston rod 7. Yes.
  • the lower side of the piston rod 7 is inserted into the inner cylinder 5 and is fixed to the inner peripheral side of the piston 6 with a nut 8 or the like. That is, the lower end side of the piston rod 7 is connected to the piston 6 in the inner cylinder 5. Further, the upper end side of the piston rod 7 protrudes to the outside of the outer cylinder 2 and the inner cylinder 5 via the rod guide 9, the lid body 3 and the like so as to be extendable and contractible.
  • the piston rod 7 is provided with a locking groove 7A as an annular groove at a position spaced upward by a predetermined dimension from the mounting position of the piston 6.
  • the locking groove 7A is formed using, for example, means such as rolling, and the stopper 14 is positioned by locking a retaining ring 19 described later.
  • the rod guide 9 is formed in a stepped cylindrical shape, is fitted to the upper end side of the outer cylinder 2, and is also fixedly provided on the upper end side of the enlarged diameter portion 5A of the inner cylinder 5. Thereby, the rod guide 9 positions the upper part of the inner cylinder 5 in the center of the outer cylinder 2, and guides the piston rod 7 inserted in the inner peripheral side so as to be slidable in the axial direction.
  • the rod guide 9 constitutes a support structure that supports the lid 3 from the inside when the lid 3 is caulked and fixed from the outside by the caulking portion 2A of the outer cylinder 2.
  • the rod guide 9 is formed in a predetermined shape (stepped cylindrical shape) by performing molding processing, cutting processing, or the like on a metal material, a ceramic material, a hard resin material, or the like. That is, as shown in FIG. 1, the rod guide 9 is positioned on the upper side and inserted into the inner peripheral side of the outer cylinder 2, and the rod guide 9 is positioned on the lower side of the large diameter portion 9A. A small-diameter portion 9B that is inserted into the inner peripheral side of the cylinder 5. A guide portion 10 is provided on the inner peripheral side of the small diameter portion 9B to guide the piston rod 7 inserted into the inner cylinder 5 so as to be slidable in the axial direction.
  • the guide portion 10 is configured as a sliding cylinder in which an inner peripheral surface of a metal cylinder is covered with a fluorine-based resin (tetrafluoroethylene) or the like.
  • the large diameter portion 9A of the rod guide 9 is provided with an annular oil reservoir chamber 9C on the upper surface side of the large diameter portion 9A facing the lid 3.
  • the oil sump chamber 9C is formed as an annular space that surrounds the rod seal 4 and the piston rod 7 from the outside in the radial direction.
  • the oil sump chamber 9 ⁇ / b> C is used when the hydraulic oil in the rod-side oil chamber C (or gas mixed in the hydraulic oil) leaks through a slight gap between the piston rod 7 and the guide portion 10. A space for temporarily storing the leaked hydraulic oil or the like is provided.
  • the large diameter portion 9A of the rod guide 9 is provided with a communication passage 9D that is always in communication with the reservoir chamber A on the outer cylinder 2 side.
  • the communication passage 9D guides hydraulic oil (including gas) stored in the oil reservoir chamber 9C to the reservoir chamber A on the outer cylinder 2 side.
  • a check valve 4 ⁇ / b> A is provided between the lid 3 and the rod guide 9 so as to be positioned on the radially outer side of the rod seal 4. This check valve 4A allows the overflowing hydraulic oil to flow toward the communication passage 9D (reservoir chamber A) of the rod guide 9 when leaked oil increases and overflows in the oil sump chamber 9C. The reverse flow is prevented.
  • the hydraulic stopper mechanism 11 employed in the present embodiment will be described in detail. As will be described later, the stopper mechanism 11 extends when the piston rod 7 extends outward (extends or contracts) from the outer cylinder 2 and the inner cylinder 5 and reaches the end (extension position) of the inner cylinder 5. Actuates and stops the extension operation of the piston rod 7 by a hydraulic cushion action to prevent so-called extension.
  • the stopper mechanism 11 has a second cylinder 12 and a second piston 13.
  • the second cylinder 12 is fixedly provided on the inner side of the enlarged diameter portion 5 ⁇ / b> A located near the protruding end of the piston rod 7 in the inner cylinder 5.
  • the second piston 13 is located on the rod guide 9 side with respect to the piston 6 and is provided on the outer peripheral side of the piston rod 7. When the piston rod 7 is fully extended (when fully extended), the second piston 13 is slidably inserted (entered) into the inner peripheral side of the second cylinder 12 to exert a hydraulic cushion action. is there.
  • the second cylinder 12 has a sleeve 12B which is provided in the diameter-enlarged portion 5A of the inner cylinder 5 in a retaining state via a cylindrical collar 12A.
  • the upper end side of the sleeve 12B is fitted and fixed to the lower end side of the small diameter portion 9B of the rod guide 9.
  • the lower end side of the sleeve 12B forms an open end 12C that expands in a tapered shape. This open end 12C smoothes and compensates for the second piston 13 that moves integrally with the piston rod 7 being slidably inserted into the sleeve 12B.
  • the second piston 13 is provided between the piston 6 and the second cylinder 12 and constitutes a movable part of the stopper mechanism 11. That is, the second piston 13 moves (displaces) integrally with the piston rod 7 in the inner cylinder 5 as the piston rod 7 moves, and is configured to be fitted in the second cylinder 12.
  • the second piston 13 includes a stopper 14 (first member) fixed to the piston rod 7, a castle 15 (second member) press-fitted to the inner periphery of the upper end of the stopper 14, and the stopper 14. And a piston ring 17 provided in a ring groove 16 between the castle 15 and a cushion member 18 disposed above the castle 15.
  • the stopper 14 as the first member is positioned on the lower side of the second piston 13 and is inserted into the outer peripheral side of the piston rod 7, and is pulled out into the locking groove 7 ⁇ / b> A of the piston rod 7 through a retaining ring 19 described later. It is fixed in the stopped state.
  • the stopper 14 includes a cylindrical portion 14A, a flange portion 14B, a notch 14C, a cylindrical fixing portion 14D, and a circumferential groove 14E. That is, the stopper 14 is made of a metal material, as shown in FIGS. 2, 4 and 7, as a cylindrical portion 14A positioned on the upper side and a large diameter portion positioned on the lower side of the cylindrical portion 14A. 14B, and is formed in a stepped cylindrical shape.
  • the stopper 14 attaches the castle 15 and the piston ring 17 to the piston rod 7 in a retaining state, and as a hydraulic stopper suppresses the flow of hydraulic oil and generates a damping force.
  • an inner fitting hole 14A1 that opens to the upper end side (the castle 15 side) is formed in the cylindrical portion 14A of the stopper 14.
  • a cylindrical projection 15B of a castle 15 (described later) is press-fitted and fitted into the inner fitting hole 14A1. Thereby, the castle 15 is fitted to the stopper 14 in a retaining state, and both are integrated.
  • the cylindrical portion 14 ⁇ / b> A of the stopper 14 is formed so that the thickness on the radially outer side of the inner fitting hole 14 ⁇ / b> A ⁇ b> 1 is thicker than the cylindrical protrusion 15 ⁇ / b> B of the castle 15.
  • the flange portion 14B of the stopper 14 protrudes radially outward from the lower end side (piston 6 side) of the cylindrical portion 14A, and is formed with a larger outer diameter than the cylindrical portion 14A.
  • the upper end surface of the flange portion 14B comes into contact with the lower end surface of the piston ring 17 and restricts the piston ring 17 from dropping to the piston 6 side.
  • One or more cutouts 14C are formed on the upper surface of the flange portion 14B (the surface facing the piston ring 17 above and below) by partially cutting away the upper surface of the flange portion 14B. (See FIG. 2).
  • This notch 14C constitutes a throttle passage that restricts the flow of hydraulic oil, and suppresses the flow of hydraulic oil when the piston rod 7 extends to generate a damping force as will be described later.
  • the cylindrical fixing portion 14D is positioned on the inner peripheral side of the lower end of the flange portion 14B of the stopper 14, and is fixed by caulking to the outer peripheral side of the piston rod 7, as will be described later.
  • the stopper 14 is formed with a circumferential groove 14E having an arc cross section on the inner peripheral side of the cylindrical fixing portion 14D on the lower end side of the flange portion 14B.
  • the circumferential groove 14E is opened at the lower end side of the cylindrical fixing portion 14D, and when the stopper 14 is positioned (temporarily fixed) on the outer peripheral side of the piston rod 7, the retaining ring 19 described later is surrounded from the outside. It is an engaging groove that engages with the retaining ring 19.
  • the cylindrical fixing portion 14D is caulked and fixed to the outer peripheral side of the piston rod 7 as described later (See FIGS. 7 to 9).
  • the cylindrical fixing portion 14D is fixed in a non-rotating state by retaining the stopper 14 as a whole to the piston rod 7 via the retaining ring 19.
  • the outer peripheral surface of the cylindrical fixing portion 14D is a taper composed of an obliquely downward inclined surface that is gradually reduced in diameter downward. Formed as surface 14D1.
  • This taper surface 14D1 serves as a guide surface for the hydraulic oil flowing on the outer peripheral side of the stopper 14, and smoothes the flow of the hydraulic oil.
  • the castle 15 as the second member is located on the upper side of the stopper 14 so as to be inserted into the outer peripheral side of the piston rod 7.
  • the castle 15 is formed as a cylindrical body using a metal material.
  • the castle 15 includes an annular flange 15A formed with an outer diameter equivalent to the flange 14B of the stopper 14, a cylindrical protrusion 15B extending downward in the axial direction from the inner peripheral side of the flange 15A, and a flange 15A has concave and convex portions 15C that are alternately formed in the circumferential direction on the lower surface side of 15A (that is, radially outside of the cylindrical projection 15B).
  • a plurality of recesses 15D are formed on the upper surface (that is, the surface facing the cushion member 18 above and below) of the flange portion 15A so as to be spaced apart from each other in the circumferential direction.
  • the flange portion 15A, the cylindrical projection 15B, the concavo-convex portion 15C, the concave portion 15D and the like of the castle 15 are integrally formed by forging, for example. Accordingly, the castle 15 can form the flange portion 15A, the cylindrical protrusion portion 15B, the concave and convex portion 15C, and the concave portion 15D without performing cutting or the like.
  • the castle 15 constitutes a movable portion (second piston 13) of the stopper mechanism 11 together with the stopper 14, the piston ring 17, and the cushion member 18.
  • the cylindrical projection 15B of the castle 15 is formed as a cylindrical portion that protrudes downward in the axial direction from the inner peripheral side of the lower surface of the flange portion 15A, and the outer diameter thereof is press-fitted into the inner fitting hole 14A1 of the stopper 14.
  • the cylindrical protrusion 15B of the castle 15 is formed thinner than the cylindrical portion 14A of the stopper 14 (the radially outer portion of the inner fitting hole 14A1).
  • the inner diameter dimension of the cylindrical protrusion 15B is slightly larger than the outer diameter dimension of the piston rod 7, and a radial gap is formed between the outer peripheral surface of the piston rod 7 and the cylindrical protrusion 15B. (See FIGS. 3 and 7 to 9).
  • the inner diameter dimension of the flange portion 15 ⁇ / b> A is formed corresponding to the outer diameter dimension of the piston rod 7, and the inner periphery of the flange portion 15 ⁇ / b> A is in contact (contact) with the outer peripheral surface of the piston rod 7.
  • the cylindrical protrusion 15B of the castle 15 is press-fitted into the inner fitting hole 14A1 with respect to the cylindrical portion 14A of the stopper 14. That is, the cylindrical protrusion 15B of the castle 15 is press-fitted and connected to the inner fitting hole 14A1 of the stopper 14 as described later. Thereby, the castle 15 is fitted to the stopper 14 in a retaining state, and the stopper 14 and the castle 15 are integrally coupled.
  • the uneven portion 15C is located on the lower surface (surface facing the piston ring 17 above and below) of the castle 15 made of a cylindrical body, and a plurality of (for example, five) concavo-convex portions 15C are provided in the circumferential direction of the castle 15. Has been placed.
  • These concavo-convex portions 15 ⁇ / b> C form a flow path for operating oil to flow between the lower end surface of the castle 15 and the upper end surface of the piston ring 17 by partially cutting the lower end surface of the castle 15. Yes.
  • hydraulic oil can always flow between the castle 15 and the piston ring 17.
  • the ring groove 16 is located between the stopper 14 and the castle 15 and is formed on the outer peripheral surface (the outer periphery of the second piston 13) of the cylindrical portion 14A of the stopper 14.
  • the ring groove 16 is formed as a circumferential groove having a U-shaped cross section or a U-shape by the stopper 14 and the castle 15 by integrating the stopper 14 and the castle 15 by means such as press fitting. . That is, the lower surface of the flange portion 15 ⁇ / b> A of the castle 15 constitutes the upper surface of the ring groove 16, and the upper surface of the flange portion 14 ⁇ / b> B of the stopper 14 constitutes the lower surface of the ring groove 16.
  • the concavo-convex portion 15 ⁇ / b> C of the castle 15 functions as a communication groove (notch) formed in the ring groove 16, and allows hydraulic oil to constantly flow between the castle 15 and the piston ring 17.
  • a piston ring 17 is loosely fitted in the ring groove 16, and the piston ring 17 is attached in the ring groove 16 so as to be displaceable within a predetermined range in the axial direction in a retaining state. That is, the movement of the piston ring 17 in the axial direction is restricted by the stopper 14 and the castle 15 and can be slightly displaced in the axial direction between the upper surface of the flange portion 14B and the lower surface of the flange portion 15A of the castle 15. .
  • the inner diameter of the piston ring 17 is formed larger than the outer diameter of the ring groove 16 (that is, the cylindrical portion 14A of the stopper 14), and a flow path for hydraulic oil is provided between the two.
  • the piston ring 17 is formed as an annular ring using an elastic material having oil resistance and heat resistance (for example, a copper-based metal material such as brass or a fluorine-based resin material).
  • the piston ring 17 is configured such that, for example, an intermediate portion (one portion) in the circumferential direction can be expanded and contracted by a C-shaped ring cut at the position of the cut portion 17A. That is, the piston ring 17 has a cut portion 17A as both ends in the circumferential direction from which a part is cut off.
  • the outer peripheral surface of the piston ring 17 comes into sliding contact with the inner peripheral surface of the sleeve 12B.
  • the outer peripheral surface of the piston ring 17 can seal between the sleeve 12B and the second piston 13 and restrict the flow of hydraulic oil.
  • the piston ring 17 is detachably attached in the ring groove 16 between the flange 14B of the stopper 14 and the flange 15A of the castle 15.
  • the piston ring 17 is formed in a free length state (a free state where no external force is applied), and has an outer diameter that is smaller than the inner diameter of the inner cylinder 5 and slightly larger than the inner diameter of the sleeve 12B.
  • the corners of the upper end face 17B located on one side in the axial direction of the piston ring 17 have an arcuate shape in order to prevent damage or galling when the piston ring 17 enters the sleeve 12B. The chamfering is given to.
  • the cushion member 18 is a buffer member for preventing collision provided by being inserted into the outer peripheral side of the piston rod 7, and reduces the collision and impact of the second piston 13 on the rod guide 9.
  • the cushion member 18 is formed as a cylindrical body using an elastically deformable synthetic resin, a rubber material, or a hard rubber material (for example, an elastic material softer than the piston ring 17). Thereby, even if the second piston 13 collides (contacts) with the rod guide 9 when the piston rod 7 is extended to the maximum, the impact at this time is alleviated and the piston rod 7 is further extended. To regulate.
  • the cushion member 18 has an uneven surface 18A and a recessed groove 18B.
  • the cushion member 18 constitutes a movable portion (second piston 13) of the stopper mechanism 11 together with the stopper 14, the castle 15, and the piston ring 17.
  • the uneven surface 18A is located on the upper surface of the cushion member 18 and is formed in a wave shape. For this reason, even if the second piston 13 enters the second cylinder 12 when the piston rod 7 is extended to the maximum and the uneven surface 18A of the cushion member 18 contacts the lower surface of the rod guide 9 (small diameter portion 9B), It is possible to prevent the adhesion phenomenon or the like between the two by the wave-shaped uneven surface 18A.
  • a plurality of (for example, six) concave grooves 18 ⁇ / b> B are arranged at equal intervals in the circumferential direction of the cushion member 18, located on the outer peripheral side of the cushion member 18 made of a cylindrical body.
  • the concave groove 18B is formed by cutting the outer peripheral surface of the cushion member 18 so as to extend in the axial direction, and a flow path for operating oil to flow between the sleeve 12B of the second cylinder 12 and the cushion member 18. Is configured.
  • the retaining ring 19 is composed of, for example, a C-shaped ring that can be expanded and contracted.
  • the retaining ring 19 is detachably attached to the locking groove 7A of the piston rod 7 from the outside in the radial direction.
  • the circumferential groove 14E of the stopper 14 is inserted into the outer peripheral side of the piston rod 7 so as to engage with the retaining ring 19 from the outside.
  • the cylindrical fixing portion 14D of the stopper 14 is caulked and fixed to the outer peripheral side of the piston rod 7, whereby the stopper 14 is firmly fixed to the outer peripheral side of the piston rod 7 via the locking groove 7A and the retaining ring 19.
  • the piston rod 7 is fixed and positioned in the axial direction and the radial direction.
  • the sub-assembly 20 is configured by sub-assembling the stopper 14, the castle 15 and the piston ring 17 in advance as shown in FIGS. That is, the subassembly 20 includes a first member (stopper 14) and a second member (castle 15) that are press-fitted together, and a piston ring 17 that is provided on the outer periphery of the joint portion.
  • a cushion member 18 made of a cylindrical body is disposed on the castle 15 of the subassembly 20.
  • the hydraulic shock absorber 1 as a cylinder device according to the present embodiment has the above-described configuration. Next, an assembly method thereof will be described.
  • a castle 15, a piston ring 17 and a stopper 14 are inserted into the outer peripheral side of the piston rod 7, and a retaining ring is inserted into the locking groove 7 A of the piston rod 7.
  • the flange portion 15A of the castle 15 is placed on the support plate 21 serving as a support base, and the piston ring 17 and the stopper 14 are arranged from above.
  • An insertion hole 21 ⁇ / b> A through which the piston rod 7 is inserted inside is formed on the inner peripheral side of the support plate 21.
  • the support plate 21 is fixed to a predetermined position shown in FIG. 3 using a jig (not shown) or the like.
  • the cylindrical protrusion 15B of the castle 15 can be press-fitted into the inner fitting hole 14A1 of the stopper 14, and the piston ring 17 is loosely fitted in the ring groove 16 between them. It is inserted in the retaining state.
  • the sub-assembly 20 is constituted by the piston ring 17 (see FIGS. 4 to 6).
  • the inner diameter dimension of the piston ring 17 in the free length state is slightly larger than the outer peripheral surface (outer diameter dimension) of the cylindrical portion 14A of the stopper 14.
  • the piston ring 17 has the flange 14B of the stopper 14 and the end surface 15A of the castle 15 (the surface on which the uneven portion 15C is formed). Can be displaced slightly in the axial direction.
  • the stopper 14 and the castle 15 are integrated in a retaining state by press-fitting the cylindrical protrusion 15B of the castle 15 into the inner fitting hole 14A1 of the stopper 14 on the inner peripheral side.
  • the sub-assembly 20 including the stopper 14, the castle 15 and the piston ring 17 which are pre-assembled in advance is connected to the outer periphery of the piston rod 7 with the stopper 14 It fixes via the cylindrical fixing
  • the stopper 14 that forms a part of the sub-assembly 20 has the cylindrical fixing portion 14 ⁇ / b> D in the outer periphery of the piston rod 7 with the lower peripheral groove 14 ⁇ / b> E engaged with the retaining ring 19 on the outer peripheral side of the piston rod 7. Caulked to the side.
  • the cylindrical fixing portion 14D can prevent the entire stopper 14 from being removed from the piston rod 7 via the retaining ring 19 and fixed in a rotating state.
  • the cushion member 18 is inserted into the outer peripheral side of the piston rod 7 so as to be loosely fitted from the upper side of the castle 15, and the lower end surface of the cushion member 18 is in contact with the upper end surface (on the recess 15 ⁇ / b> D) of the castle 15. It becomes a state.
  • the second cylinder 12 of the stopper mechanism 11 is assembled by fitting a sleeve 12B inside a diameter-enlarged portion 5A of the inner cylinder 5 via a cylindrical collar 12A.
  • the piston rod 7 is inserted inside the inner cylinder 5, and at this time, the piston 6 is slidably inserted into the inner cylinder 5.
  • the lid body 3 to which the rod seal 4 and the like are attached is disposed on the upper side of the rod guide 9. .
  • the rod guide 9 is pressed against the inner cylinder 5 via the lid 3 by a cylindrical pressing tool (not shown) or the like so that the rod guide 9 does not rattle in the axial direction.
  • the outer diameter side of the lid 3 and the large diameter portion 9A of the rod guide 9 are fixed by the caulking portion 2A by bending the upper end portion of the outer cylinder 2 inward in the radial direction.
  • the upper end side of the piston rod 7 is attached to the vehicle body side of the automobile, and the lower end side of the outer cylinder 2 is attached to the axle (not shown) side.
  • the disk valve 6C, 6D of the piston 6 etc. A damping force on the extension side is generated and can be buffered to attenuate the upper and lower vibrations of the vehicle.
  • the hydraulic oil in the rod-side oil chamber C enters, for example, the oil reservoir chamber 9C through a slight gap between the piston rod 7 and the guide portion 10. May leak. Further, when leakage oil increases in the oil sump chamber 9C, the overflowing hydraulic oil is guided to the communicating path 9D side of the rod guide 9 via the check valve 4A provided between the lid 3 and the rod guide 9. It is gradually refluxed into the reservoir chamber A. In this case, since a gap (see FIG. 1) is formed between the outer peripheral surface of the piston ring 17 and the inner peripheral surface of the inner cylinder 5, hydraulic oil passes through this gap on one side in the axial direction of the stopper mechanism 11. And flow to the other side.
  • the second piston 13 which is a movable part of the stopper mechanism 11, is slidably inserted (entered) into the inner peripheral side of the second cylinder 12. Is done.
  • the outer peripheral surface of the piston ring 17 is in sliding contact with the inner peripheral surface of the sleeve 12B, and the piston ring 17 is relatively displaced in the axial direction between the flange portion 14B of the stopper 14 and the castle 15. That is, as shown in FIG. 8, the lower end surface of the piston ring 17 is brought into contact with the upper surface of the flange portion 14 ⁇ / b> B of the stopper 14.
  • the inner diameter dimension of the free length state of the piston ring 17 is slightly larger than the outer peripheral surface of the cylindrical portion 14A of the stopper 14, it is between the piston ring 17 and the outer peripheral surface of the cylindrical portion 14A of the stopper 14.
  • a gap is formed.
  • a small passage (oil passage) that allows the hydraulic oil to flow is formed by the gap and the notch 14C provided in the flange portion 14B. With this passage, the hydraulic oil in the second cylinder 12 is discharged from one axial direction side (cushion member 18 side) of the second piston 13 toward the other side (lower side of the stopper 14).
  • the notch 14 ⁇ / b> C of the stopper 14 is circulated in the second cylinder 12 for the hydraulic oil discharged (circulated) from one axial side (upper side) to the other side (lower side) of the second piston 13.
  • a large aperture resistance is given.
  • the flange portion 15A of the castle 15 is provided with a plurality of uneven portions 15C, a notch (where hydraulic oil flows between the upper end surface of the piston ring 17 and the uneven portion 15C ( Gap) is formed.
  • the operating oil smoothly flows from the lower side in the axial direction of the second piston 13 toward the upper side into the second cylinder 12 by the uneven portions 15 ⁇ / b> C of the castle 15. This can be permitted, and the reduction operation of the piston rod 7 can be facilitated.
  • the gap formed by the plurality of concave and convex portions 15C is formed with a flow passage area larger than the flow passage area of the notch 14C of the flange portion 14B.
  • the flow area of the hydraulic oil becomes larger.
  • the second piston 13 operates so as to smoothly advance downward from the inside of the second cylinder 12 and can compensate for the smooth reduction operation of the piston rod 7.
  • the hydraulic stopper mechanism 11 is provided on the outer peripheral side of the piston cylinder 7 and the second cylinder 12 provided to be fixed inside the enlarged diameter portion 5A of the inner cylinder 5.
  • the second piston 13 includes a stopper 14 coupled to the piston rod 7, a castle 15 that is positioned above the stopper 14 and press-fitted into the inner fitting hole 14 ⁇ / b> A ⁇ b> 1, and the castle 15 and the castle 15
  • the piston ring 17 attached to the ring groove 16 formed by the above and the cushion member 18 are provided.
  • the stopper 14 and the castle 15 are integrated by press-fitting on the inner peripheral side thereof, and a ring groove 16 is formed between the stopper 14 and the castle 15.
  • the piston ring 17 is attached in the ring groove 16 by press-fitting the stopper 14 and the castle 15 with the piston ring 17 inserted into the outer periphery of the cylindrical portion 14 ⁇ / b> A of the stopper 14.
  • the piston ring 17 can be displaced in the axial direction in the ring groove 16 and can be attached in a retaining state.
  • the sub-assembly 20 is constituted by the stopper 14, the castle 15, and the piston ring 17.
  • the second piston 31 is constituted by a stopper 32, a castle 33, a ring groove 34, and a piston ring 35.
  • the flange portion 32B of the stopper 32 is provided with a fitting portion 32C which is reduced in diameter radially inward by a metal flow, and this fitting portion 32C is fitted into the annular groove 7A ′ of the piston rod 7.
  • the cylindrical portion 32 ⁇ / b> A of the stopper 32 is configured such that its upper end side is fitted and joined to the lower surface side of the castle 33 in the radial direction by metal flow.
  • the metal flow plastic deformation due to frictional heat
  • the cylindrical portion 32A of the stopper 32 is fitted to the inner peripheral side of the lower surface of the castle 33 by metal flow, and the castle 33 is fitted from the outer peripheral side to the upper end of the cylindrical portion 32A.
  • the surface (sliding surface of the piston ring 35) is likely to be deformed, and the performance as a hydraulic stopper mechanism may be deteriorated.
  • the hydraulic stopper mechanism 41 is constituted by the second cylinder 42 and the second piston 43.
  • the second cylinder 42 composed of the collar 42A and the sleeve 42B
  • a plurality of longitudinal grooves 42C are formed in the circumferential direction on the lower end side of the sleeve 42B.
  • the second piston 43 includes a stopper 44, a castle 45, a ring groove 46 and a piston ring 47.
  • the stopper 44 is fixed to the outer peripheral side of the piston rod 7 using a retaining ring 48, and the castle 45 is fixed to the outer peripheral side of the piston rod 7 with another retaining ring 49.
  • the collar 42A is formed of a resin material, and is provided between the enlarged diameter portion 5A of the inner cylinder 5 and the sleeve 42B.
  • the vertical groove 42C on the lower side of the sleeve 42B has a shape in which the radial width decreases from the second piston 43 side toward the rod guide 9 side.
  • the vertical groove 42C is formed by pressing with a press from the inner peripheral side of the sleeve 42B toward the outer peripheral side. Thereby, the inner peripheral side of the sleeve 42B is concave, and the outer peripheral side of the sleeve 42B is convex.
  • the collar 42A is provided with a notch 42D.
  • the cutout portion 42D is provided so as to fit a vertical groove 42C that is convex toward the collar 42A. That is, the shape is larger in both the axial direction and the radial direction than the longitudinal groove 42C. Furthermore, a notch groove 42E is formed at the end of the collar 42 on the rod guide 9 side. This notch groove 42E is used for alignment when the collar 42 is press-fitted into the sleeve 42B. By this notch groove 42E, the press-fit of the collar 42A to the sleeve 42B can be assembled by an automatic machine.
  • a disk 50 is provided between the stopper 44 and the castle 45, and a notch 51 is provided in the disk 50. Accordingly, when the second piston 43 starts to enter the sleeve 42B, the gap between the longitudinal groove 42C of the sleeve 42B and the piston ring 47, the space between the piston ring 47 and the castle 45, and the notch 51 of the disk 50 are provided. Oil flows through. Next, as the second piston 43 moves toward the rod guide 9 side, the flow of oil gradually decreases, and when the second piston 42 enters to a position where there is no vertical groove 42C, between the piston ring 47 and the castle 45, The oil flow is generated only through the notch 51 of the disk 50. Thereby, since the pressure in the sleeve 42B gradually increases, the damping force can be increased smoothly.
  • the castle 45 is formed as a cylindrical body having an L-shaped cross section, and in order to form the ring groove 46 between the stopper 44, another retaining ring 49 is used. It is necessary to fix to the outer peripheral side of the piston rod 7. Since the stopper 44 and the castle 45 are separately fixed to the outer peripheral side of the piston rod 7 using the retaining rings 48 and 49, the number of man-hours during assembly increases and the productivity cannot always be improved.
  • the cylindrical projection 15B of the castle 15 is axially press-fitted into the inner fitting hole 14A1 of the stopper 14, and the castle 15 is fitted to the stopper 14 in a retaining state.
  • the stopper 14 and the castle 15 are integrally coupled.
  • the cylindrical protrusion 15B of the castle 15 is formed thinner than the cylindrical portion 14A of the stopper 14 (the radially outer portion of the inner fitting hole 14A1).
  • the inner diameter dimension of the cylindrical protrusion 15B is slightly larger than the outer diameter dimension of the piston rod 7, and a radial gap is formed between the outer peripheral surface of the piston rod 7 and the cylindrical protrusion 15B. (See FIGS. 3 and 7 to 9).
  • the stopper 14 is provided with a notch 14C as a throttle portion that suppresses the flow of hydraulic oil and generates a damping force.
  • the hydraulic oil can be circulated through the notch 14 ⁇ / b> C serving as the throttle channel while the piston ring 17 is in contact with the flange 14 ⁇ / b> B of the stopper 14. it can.
  • the notch 14 ⁇ / b> C can suppress the flow of the hydraulic oil and generate a damping force, and can satisfactorily generate an impact relaxation force when the piston rod 7 is fully extended.
  • the concavo-convex portion 15 ⁇ / b> C of the castle 15 is configured such that hydraulic oil is constantly circulated between the castle 15 and the piston ring 17 as a notch formed in the ring groove 16.
  • the working oil is allowed to flow smoothly into the second cylinder 12 from the other axial side (lower side) of the second piston 13 to one side (upper side). Therefore, the reduction operation of the piston rod 7 can be facilitated.
  • the retaining ring 19 is fitted in the locking groove 7A of the piston rod 7, and the cylindrical fixing portion 14D of the stopper 14 is fixed by caulking to the outer peripheral side of the piston rod 7 in this state.
  • the present invention is not limited to this, and the cylindrical fixing portion 14D of the stopper 14 may be fixed to the outer peripheral side of the piston rod 7 using means such as metal flow (plastic flow).
  • the present invention is not limited to this, and one to four or six or more recessed portions may be provided in the castle.
  • the corrugated uneven surface 18A is provided on the upper surface of the cushion member 18.
  • the present invention is not limited to this, and a configuration may be adopted in which a through hole penetrating in the axial direction from the upper end surface to the lower end surface of the cushion member is provided.
  • the piston ring 17 is formed as a ring that can be expanded and contracted using, for example, a heat-resistant metal material or a fluorine-based resin material has been described as an example.
  • the present invention is not limited to this, and the piston ring may be formed using, for example, a high-strength fiber reinforced resin material.
  • the 2nd cylinder 12 inserts the cylinder used as the 2nd cylinder 12 in the inner cylinder 5 (1st cylinder), and separates the inner cylinder 5 and the 2nd cylinder 12 into a separate body. It was set as the structure provided. However, the present invention is not limited to this, and the inner cylinder and the second cylinder may be integrally formed by reducing the diameter of the inner cylinder, for example.
  • a multi-cylinder shock absorber including the outer cylinder 2 and the inner cylinder 5 has been described as an example.
  • the present invention is not limited to this, and can also be applied to a single-cylinder shock absorber that is slidably fitted into a single cylinder.
  • the hydraulic shock absorber 1 attached to each wheel side of the four-wheel vehicle has been described as a representative example of the cylinder device.
  • the present invention is not limited to this, and may be, for example, a hydraulic shock absorber used for a two-wheeled vehicle, or may be used for a cylinder device used for various machines other than cars, buildings, and the like.
  • shock absorber based on the embodiment described above, for example, the following modes can be considered.
  • a first cylinder in which a working fluid is sealed a first piston that is slidably provided in the first cylinder and partitions the first cylinder, and the first piston
  • a piston rod connected to the first cylinder a rod guide provided on one end side of the first cylinder and slidably guided through the piston rod, and an end in the first cylinder when the piston rod extends or contracts
  • a stopper mechanism that operates when reaching a part wherein the stopper mechanism includes a second cylinder provided at an end in the first cylinder and a movement of the piston rod.
  • a second piston that has been moved and inserted into the second cylinder, the second piston being coupled to the piston rod;
  • the second member that is integrated with the member by press-fitting and forms a ring groove between the first member and the second piston, and the first member and the second member.
  • a piston ring that is axially displaceable in the ring groove and is attached in a retaining state, and has a ring-shaped, partially cut-off circumferential end, and the piston rod is press-fitted to the piston rod.
  • a subassembly composed of one member and the second member and the piston ring provided on the outer periphery of the connecting portion is fixed. Thereby, workability
  • the second member includes an annular flange, a cylindrical protrusion extending in an axial direction from an inner peripheral side of the flange, and the cylindrical shape of the flange. It has the uneven
  • the 1st member and the 2nd member can be press-fitted and joined together on the inner peripheral side, and both can be integrated and firmly joined.
  • the uneven portion of the second member can function as a notch formed in the ring groove, and the working fluid can be circulated constantly between the second member and the piston ring.
  • the second member is integrally formed by forging, it is possible to form the flange portion, the cylindrical protrusion portion, and the uneven portion on the second member without performing cutting or the like.
  • this invention is not limited to above-described embodiment, Various modifications are included.
  • the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described.
  • a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

Dans la présente invention, un mécanisme d'arrêt hydraulique 11 est configuré à partir d'un second cylindre 12 fixé à l'intérieur d'une partie de diamètre agrandi 5A d'un tube interne 5, et d'un second piston 13 disposé sur le côté circonférentiel externe d'une tige de piston 7. Le second piston 13 a un bouchon 14 relié à la tige de piston 7, un château 15 qui est positionné sur le côté supérieur du bouchon 14 et intégré à celui-ci en étant ajusté par pression et joint à l'intérieur d'un trou d'ajustement intérieur 14A1, et une bague de piston 17 fixée à une rainure annulaire 16 définie par le château 15 et au château 15. Le bouchon 14 et le château 15 sont intégrés ensemble par ajustement serré et assemblés sur le côté circonférentiel interne de celui-ci, et la rainure annulaire 16 est formée entre le bouchon 14 et le château 15.
PCT/JP2018/021508 2017-06-05 2018-06-05 Dispositif cylindre WO2018225711A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-110781 2017-06-05
JP2017110781A JP2020128752A (ja) 2017-06-05 2017-06-05 シリンダ装置

Publications (1)

Publication Number Publication Date
WO2018225711A1 true WO2018225711A1 (fr) 2018-12-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/021508 WO2018225711A1 (fr) 2017-06-05 2018-06-05 Dispositif cylindre

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JP (1) JP2020128752A (fr)
WO (1) WO2018225711A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004060776A (ja) * 2002-07-29 2004-02-26 Showa Corp 油圧緩衝器のばね荷重調整装置
JP2004068841A (ja) * 2002-08-01 2004-03-04 Showa Corp 車両用の油圧緩衝器
JP2004068840A (ja) * 2002-08-01 2004-03-04 Showa Corp 車両用の油圧緩衝器
WO2016019460A1 (fr) * 2014-08-04 2016-02-11 Walter Surface Technologies Inc. Dispositif de nettoyage de soudures
WO2017002595A1 (fr) * 2015-06-30 2017-01-05 日立オートモティブシステムズ株式会社 Dispositif du type cylindre

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004060776A (ja) * 2002-07-29 2004-02-26 Showa Corp 油圧緩衝器のばね荷重調整装置
JP2004068841A (ja) * 2002-08-01 2004-03-04 Showa Corp 車両用の油圧緩衝器
JP2004068840A (ja) * 2002-08-01 2004-03-04 Showa Corp 車両用の油圧緩衝器
WO2016019460A1 (fr) * 2014-08-04 2016-02-11 Walter Surface Technologies Inc. Dispositif de nettoyage de soudures
WO2017002595A1 (fr) * 2015-06-30 2017-01-05 日立オートモティブシステムズ株式会社 Dispositif du type cylindre

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