WO2015178285A1 - 緩衝器 - Google Patents
緩衝器 Download PDFInfo
- Publication number
- WO2015178285A1 WO2015178285A1 PCT/JP2015/063929 JP2015063929W WO2015178285A1 WO 2015178285 A1 WO2015178285 A1 WO 2015178285A1 JP 2015063929 W JP2015063929 W JP 2015063929W WO 2015178285 A1 WO2015178285 A1 WO 2015178285A1
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- WO
- WIPO (PCT)
- Prior art keywords
- rod
- rod guide
- cylinder
- shock absorber
- annular
- Prior art date
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Classifications
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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
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/362—Combination of sealing and guide arrangements for piston rods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
- B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
- B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
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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
- F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
- F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
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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
- F16F9/3207—Constructional features
- F16F9/3235—Constructional features of cylinders
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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
- F16F9/3207—Constructional features
- F16F9/3235—Constructional features of cylinders
- F16F9/3242—Constructional features of cylinders of cylinder ends, e.g. caps
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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
- F16F9/36—Special sealings, including sealings or guides for piston-rods
-
- 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
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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
- F16F9/58—Stroke limiting stops, e.g. arranged on the piston rod outside the cylinder
- F16F9/585—Stroke limiting stops, e.g. arranged on the piston rod outside the cylinder within the cylinder, in contact with working fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
- B60G2202/20—Type of damper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
- B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
- B60G2206/40—Constructional features of dampers and/or springs
- B60G2206/41—Dampers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
- B60G2800/16—Running
- B60G2800/162—Reducing road induced vibrations
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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
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/061—Mono-tubular units
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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
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/064—Units characterised by the location or shape of the expansion chamber
- F16F9/065—Expansion chamber provided on the upper or lower end of a damper, separately there from or laterally on the damper
Definitions
- This invention relates to a shock absorber.
- a shock absorber disclosed in US Pat. No. 3,837,445B includes a cylinder in which a working chamber is formed, an annular rod guide fixed to the upper opening of the cylinder, and an annular seat provided on the working chamber side of the rod guide.
- the rod guide and a rod inserted inside the seat so as to be movable in the axial direction, an annular oil seal that is held on the inner periphery of the rod guide and seals the outer periphery of the rod, and the rod guide
- An annular seal holder provided between the seat and provided on the outer periphery of the oil seal.
- the above-mentioned seal holder is made of an elastic body such as rubber, and elastically supports the outer periphery of the lip portion of the oil seal to enhance the sealing performance (sealing performance) by the oil seal, and is in close contact with the inner peripheral surface of the cylinder.
- the circumference is sealed.
- a communication passage that penetrates the sheet in the axial direction is formed in the sheet.
- the sealing performance of the oil seal can also be enhanced by the pressure of the working chamber being transmitted to the oil seal via the seal holder via the communication path.
- the seal holder receives pressure from the working chamber via the communication path, the seal holder is pressed against the rod guide and compressed, so that the force of tightening the lip portion of the oil seal by the seal holder is increased. Therefore, since the lip portion can be strongly pressed against the outer peripheral surface of the rod, the sealing performance by the oil seal is enhanced.
- an object of the present invention is to provide a shock absorber capable of extending the rebound cushion even when the communication path passes through the seat and the rebound cushion attached to the outer periphery of the rod is abutted against the seat. It is.
- a shock absorber a cylinder in which a working chamber is formed, an annular rod guide fixed to an opening on one side of the cylinder, and the working chamber of the rod guide.
- An annular sheet fixed to the side, the rod guide and a rod inserted in the inner peripheral side of the sheet so as to be movable in the axial direction, and held on the inner periphery of the rod guide and slid on the outer peripheral surface of the rod.
- An annular oil seal that comes into contact; a rebound cushion that is attached to the outer periphery of the rod that is inserted into the cylinder and strikes the seat when fully extended; and a communication path that transmits the pressure of the working chamber to the oil seal.
- the opening on the working chamber side of the communication path is arranged on the outer peripheral side of the seat where the rebound cushion abuts.
- FIG. 1 is a front view partially taking a cross section of a shock absorber according to an embodiment of the present invention.
- FIG. 2 is an enlarged view of the main part of FIG.
- FIG. 3 is an enlarged perspective view of the rod guide of the shock absorber according to the embodiment of the present invention cut vertically.
- FIG. 4 is an enlarged perspective view of the shock absorber sheet according to the embodiment of the present invention, cut vertically.
- FIG. 5 is a longitudinal sectional view showing a modified example of the shock absorber according to the embodiment of the present invention and enlarging the deformed portion.
- the shock absorber A includes a cylinder 1 in which a working chamber L is formed, and an annular rod guide 2 fixed to one side opening of the cylinder 1. And an annular sheet 30 fixed to the working chamber L side of the rod guide 2. Further, the shock absorber A is slid onto the outer peripheral surface of the rod 4 and the rod 4 inserted through the inner periphery of the rod guide 2 and the annular seat 30 so as to be movable in the axial direction, and held on the inner periphery of the rod guide 2. And an annular oil seal 10 in contact therewith.
- shock absorber A is attached to the outer periphery of the rod 4 inserted into the cylinder 1 and rebound cushion 31 that abuts against the seat 30 at its maximum extension, and a communication path P that transmits the pressure of the working chamber L to the oil seal 10. It has. And the opening by the side of the action chamber L of the communicating path P is arrange
- the shock absorber A is used for a vehicle such as an automobile.
- the cylinder 1 is connected to the wheel side, and the protruding end portion of the rod 4 protruding from the cylinder 1 is connected to the vehicle body side.
- the shock absorber A is provided in the vehicle so as to be upright. For this reason, when an impact caused by road surface unevenness is input to the wheel, the rod 4 enters and exits the cylinder 1 and the shock absorber A expands and contracts as a whole.
- the shock absorber A may be used for vehicles other than automobiles, devices, structures, and the like. Further, the cylinder 1 may be provided on the vehicle so as to be inverted while the cylinder 1 is connected to the vehicle body side and the rod 4 is connected to the wheel side.
- the cylinder 1 is formed in a bottomed cylindrical shape.
- An annular rod guide 2 is fixed to the upper opening of the cylinder 1. Further, the rod 4 passes through the rod guide 2 and enters and exits the cylinder 1. Further, the shock absorber A is held at the lower end portion of the rod 4 and slidably contacts the inner peripheral surface of the cylinder 1, the free piston 6 that slidably contacts the inner peripheral surface of the cylinder 1 on the opposite rod side, and the shock absorber A And a rebound member 3 that alleviates the impact at the time of maximum extension.
- the cylinder 1 is partitioned by a free piston 6 into the above-described working chamber L filled with hydraulic oil and an air chamber G filled with gas.
- the air chamber G expands and contracts due to the movement of the free piston 6 in the axial direction (up and down). Can be compensated.
- the free piston 6 moves upward and the air chamber G expands. Compensate in room G.
- the shock absorber A in which the rod 4 enters the cylinder 1 is compressed, the free piston 6 moves downward and the air chamber G is reduced. It can be compensated by the air chamber G.
- the free piston 6 moves downward to reduce the air chamber G, and when the volume of the hydraulic oil decreases due to a temperature drop, the free piston 6 Moves upward and the air chamber G expands.
- the shock absorber A includes the air chamber G and is set to a single cylinder type.
- a reservoir is provided outside the cylinder 1 to provide hydraulic oil and gas.
- the reservoir may compensate for a change in volume in the cylinder or a change in volume of hydraulic fluid.
- an outer cylinder may be provided on the outer periphery of the cylinder 1 to constitute the shock absorber A in a double cylinder type, and a reservoir may be formed between the cylinder 1 and the outer cylinder.
- the liquid filled in the working chamber L may be other than hydraulic oil, and can be appropriately changed as long as a damping force can be generated.
- the working chamber L is divided into an extension side chamber L1 on the rod 4 side (upper side in the figure) with the piston 5 in between, and a pressure side chamber L2 on the opposite side (lower side in the figure) with the piston 5 in between. Yes.
- the piston 5 is formed with an extension side passage 5a and a pressure side passage 5b communicating the extension side chamber L1 and the pressure side chamber L2.
- a lower leaf valve 50 that opens and closes the expansion side passage 5a is stacked
- an upper leaf valve 51 that opens and closes the pressure side passage 5b is stacked.
- the lower-side leaf valve 50 functions as an extension-side damping valve that opens the extension-side passage 5a only during the extension operation of the shock absorber A and gives resistance to the flow of hydraulic oil that passes through the extension-side passage 5a.
- the upper leaf valve 51 functions as a pressure-side damping valve that opens the pressure-side passage 5b only during the compression operation of the shock absorber A and gives resistance to the flow of hydraulic fluid that passes through the pressure-side passage 5b.
- the shock absorber A when the shock absorber A is extended, the hydraulic oil in the expansion side chamber L1 to be reduced opens the lower leaf valve 50 and moves to the pressure side chamber L2 that expands through the expansion side passage 5a. Accordingly, the shock absorber A generates an extension side damping force due to the resistance of the lower leaf valve 50 when the hydraulic oil passes through the extension side passage 5a.
- the hydraulic oil in the compression side chamber L2 to be reduced opens the upper side leaf valve 51 and moves to the expansion side chamber L1 that expands through the pressure side passage 5b. Thereby, the shock absorber A generates a compression side damping force due to the resistance of the leaf valve 51 when the hydraulic oil passes through the compression side passage 5b.
- the shock absorber A is set so as to generate an extension-side and compression-side damping force due to the resistance of the leaf valves 50 and 51.
- the configuration for imparting resistance to the flow of hydraulic fluid that moves between the extension side chamber L1 and the compression side chamber L2 can be changed as appropriate.
- a poppet valve or an orifice may be used as a substitute for the leaf valves 50 and 51.
- the leaf valve 50 that generates the damping force on the expansion side and the leaf valve 51 that generates the damping force on the compression side are separated, so that the damping force on the expansion side and the compression side can be set individually.
- a single valve may be capable of generating both the expansion side and compression side damping forces.
- the rod 4 connected to the piston 5 includes a small-diameter mounting portion 4a that holds the piston 5 on the outer periphery, and a shaft portion 4b that extends upward from the mounting portion 4a and penetrates the extension side chamber L1 and protrudes outside the cylinder 1. And.
- An annular groove 4c is formed in the cylinder 1 along the circumferential direction on the outer periphery of the shaft portion 4b.
- An annular stopper 32 is fitted in the groove 4c.
- An annular rebound cushion 31 is supported by the annular stopper 32.
- this rebound cushion 31 consists of elastic bodies, such as rubber
- the shaft portion 4 b of the rod 4 passes through an annular rod guide 2 that is fixed to the upper opening of the cylinder 1.
- the rod guide 2 includes an annular body portion 2a, an annular case portion 2b connected to the lower portion of the body portion 2a, and the center in the cylinder radial direction from the inner periphery of the lower end portion of the case portion 2b. And an arcuate claw 2c projecting to the side.
- the main body 2a is formed in a substantially truncated cone shape.
- the outer periphery of the main-body part 2a is formed as the inclined surface 2d inclined so that it may be gradually diameter-reduced toward an upper end.
- the lower part of the case part 2b is formed in the substantially truncated cone shape.
- the outer periphery of case part 2b is formed as the inclined surface 2e inclined so that it may be gradually diameter-reduced toward a lower end. That is, the inclined surface 2e is inclined in the opposite direction to the inclined surface 2d.
- a bottom groove 2f is formed in the lower portion of the case portion 2b from the outer peripheral end to the inner peripheral end along the cylinder radial direction. The bottom groove 2f is formed as a gap (opening) between adjacent claws 2c.
- a seal member 11 that seals the outer periphery of the rod 4 and the inner periphery of the cylinder 1 is laminated on the upper portion of the main body 2 a of the rod guide 2.
- An annular bearing 12 that supports the rod 4 so as to be movable in the axial direction is fitted to the inner periphery of the main body 2a.
- an oil seal 10 that seals the outer periphery of the rod 4 and a seal holder 13 are held on the inner periphery of the case portion 2b.
- an annular sheet 30 is laminated on the lower portion (the working chamber L side) of the case portion 2b.
- the rod guide 2, the bearing 12, the oil seal 10 and the seal holder 13 can be assembled together in advance so as not to be separated from each other, and these constitute the rod guide assembly B.
- a groove 1a along the circumferential direction is formed on the inner periphery of the cylinder 1, and a retaining ring 14 is fitted in the groove 1a.
- the seat 30, the rod guide assembly B, and the seal member 11 are stacked in this order on the upper part of the retaining ring 14 protruding from the inner peripheral surface of the cylinder 1.
- the seat 30, the rod guide assembly B, and the seal member 11 are laminated and fixed to the upper opening of the cylinder 1 by crimping the upper end 1 b of the cylinder 1 inward.
- seat 30, the rod guide assembly B, and the sealing member 11 can be changed suitably.
- a portion corresponding to the groove 1a may be protruded to the inner peripheral side by roll caulking, and the sheet 30 may be hooked on the protruding portion.
- the seal member 11 laminated on the upper part of the main body 2a is composed of an annular plate-like insert metal 11a and a rubber part (not shown) that covers the insert metal 11a.
- This rubber part constitutes an annular dust seal 11b extending while tilting upward from the inner peripheral part of the insert metal 11a, and an annular outer peripheral seal 11c extending downward from the outer peripheral part of the insert metal 11a.
- the dust seal 11 b is in sliding contact with the outer peripheral surface of the shaft portion 4 b of the rod 4 and seals the outer periphery of the rod 4 to prevent foreign matter from entering the cylinder 1 from the outside air side.
- the outer peripheral seal 11c is in close contact with the inclined surface 2d of the rod guide 2 and the inner peripheral surface of the cylinder 1 to prevent the hydraulic oil in the cylinder 1 from leaking to the outside air side.
- annular step surface 2g is formed on the inner periphery of the case portion 2b in the rod guide 2, and the inner diameter of the case portion 2b above the step surface 2g is smaller than the inner diameter of the case portion 2b below. Is set too small.
- the annular oil seal 10 is inserted in the upper part of the step surface 2g in the case part 2b, and the annular seal holder 13 is press-fitted in the lower part of the step surface 2g in the case part 2b.
- the oil seal 10 is made of fluoro rubber (FKM), and includes an annular base portion 10a and an annular lip portion 10b that extends while inclining downward from the inner periphery of the base portion 10a.
- the seal holder 13 is made of nitrile rubber (NBR), and includes an annular press-fit portion 13a and an annular support portion 13b extending from the lower inner periphery of the press-fit portion 13a toward the center in the cylinder radial direction.
- NBR nitrile rubber
- the material and shape of the oil seal 10 and the seal holder 13 can be changed as appropriate.
- the oil seal 10 is separated from the dust seal 11 b and is disposed closer to the working chamber L than the bearing 12. For this reason, even if a foreign substance passes through the dust seal 11b, the movement of the foreign substance to the working chamber L side can be suppressed by the bearing 12, so that the foreign substance is difficult to reach the oil seal 10, and the oil seal 10 is damaged by the foreign substance. Can be suppressed, and the usage period of the oil seal 10 can be improved.
- the oil seal 10 is in sliding contact with the outer peripheral surface of the portion of the rod 4 sandwiched between the piston 5 and the bearing 12.
- this portion is a portion that is difficult to bend even if an external force acts laterally with respect to the rod 4, the lip portion 10 a of the oil seal 10 is difficult to separate from the outer peripheral surface of the rod 4, and the sealing performance by the oil seal 10 is improved. it can. Furthermore, since the oil seal 10 and the dust seal 11b are separated and separated, it is easy to select an optimum material for each of them.
- the base 10a of the oil seal 10 is pressed by the press-fit portion 13a of the seal holder 13, and the oil seal 10 is prevented from being removed from the case portion 2b unless the seal holder 13 is removed. .
- both the oil seal 10 and the seal holder 13 can be prevented from coming off by the claw 2c.
- the lower surface of the claw 2c has a taper that is inclined upward toward the center in the cylinder radial direction, the seal holder 13 is elastically deformed while being guided by the taper. For this reason, it is easy to fit the seal holder 13 above the claw 2c.
- the shape, number, and arrangement of the claws 2c can be changed as appropriate.
- the claw 2c may be formed in an annular shape, and the bottom groove 2f may extend to the inner peripheral end of the claw 2c.
- the annular sheet 30 laminated on the lower side of the rod guide 2 is inserted with the shaft portion 4b of the rod 4 on the inner side, and constitutes the rebound member 3 together with the rebound cushion 31 as described above.
- the seat 30 includes an annular plate-like abutting portion 30 a against which the rebound cushion 31 abuts and an annular plate-shaped seat portion 30 b provided on the outer peripheral side of the abutting portion 30 a. ing.
- the inner peripheral portion 30c of the abutting portion 30a is slightly raised upward and is in contact with the lower surface of the inner peripheral portion of the support portion 13b in the seal holder 13.
- the bulge in the inner peripheral portion 30c of the abutting portion 30a is gentle, even if the rebound cushion 31 collides with the abutting portion 30a, consideration is given so that the rebound cushion 31 is not damaged by the step of the abutting portion 30a.
- the abutting portion 30a is slightly raised from the seat portion 30b, and the outer peripheral portion 30d of the abutting portion 30a is inclined so as to follow the taper of the claw 2c.
- the seat portion 30b contacts the lower end surface of the case portion 2b in the rod guide 2.
- a plurality of cutouts 30e are formed in the circumferential direction on the outer periphery of the seat 30b.
- a hooking groove 30f that is hooked on the retaining ring 14 is formed in the lower portion of the seat portion 30b.
- the notch 30e opposes the inclined surface 2e formed in the lower outer periphery of the case part 2b.
- the communication passage P includes a vertical passage 33 formed between the notch 30e and the cylinder 1, an annular passage 20 formed between the inclined surface 2e and the cylinder 1, a bottom groove 2f, and a seat for the seat 30. It is comprised by the horizontal channel
- the working chamber L is sealed by compressing the gas in the air chamber G.
- the gap S is also pressurized, and the seal holder 13 is compressed by this pressure.
- the support part 13b of the seal holder 13 is diameter-reduced, and the force which clamp
- the sealing performance by the oil seal 10 can be enhanced.
- the bottom groove 2f and the gap formed between the claw 2c and the claw 2c are arranged on the same straight line, and the bottom groove 2f and the gap are arranged at equal intervals in the circumferential direction.
- a pressure can be uniformly applied to the seal holder 13.
- the configuration of the communication path P can be changed as appropriate.
- the rebound cushion 31 is held on the outer periphery of the rod 4 and moves relative to the seat 30 fixed to the cylinder 1 side as the shock absorber A expands and contracts.
- the rebound cushion 31 approaches the seat 30 along with the extension operation of the shock absorber A, is sandwiched between the seat 30 and the stopper 32 at the maximum extension, and elastically deforms to relieve the impact at the maximum extension.
- the rebound cushion 31 collides with the abutting portion 30a of the seat 30 and does not overlap the notch 30e which is the working chamber L side opening of the communication path P. For this reason, the rebound cushion 31 is not damaged at the edge of the notch 30e, and even when the communication path P passes through the seat 30, the rebound cushion 31 can be extended. Further, in the present embodiment, since the communication passage P includes the annular passage 20, it is not necessary to align the bottom groove 2f and the notch 30e, so that the shock absorber A can be easily assembled.
- the dust seal 11b is integrated with the outer peripheral seal 11c.
- an annular groove 2h extending in the circumferential direction is formed on the outer periphery of the rod guide 2, and an annular O-ring 15 fitted into the groove 2h is provided.
- This O-ring 15 is the present embodiment.
- the processing cost of the rod guide 2 can be reduced, and the assembly work can be facilitated.
- the rod guide 2 prevents the oil seal 10 and the seal holder 13 from coming off with the claws 2c.
- the oil seal 10 can be prevented from shifting due to the sliding of the rod 4, and the rod guide 2, the oil seal 10 and the seal holder 13 can be integrated as the rod guide assembly B. it can.
- the claw 2c is eliminated, an annular extending portion 2i extending downward from the outer periphery of the case portion 2b is provided, and the oil seal 10 and the seal holder 13 are inserted inside the case portion 2b.
- the seat 30 is inserted into the extended portion 2i and the lower end of the extended portion 2i is crimped inward so that the rod guide 2, the oil seal 10, the seal holder 13, and the seat 30 are integrated. May be.
- the rod guide 2 may be hooked on the retaining ring 14 as in the present embodiment.
- a groove 2j is formed on the outer periphery of the rod guide 2, and the cylinder 1 is grooved by roll caulking. You may make it fit in 2j.
- the sheet 30 is in contact with the rod guide 2. According to this, since the load (henceforth a rebound load) when the rebound cushion 31 is abutted against the sheet
- the sheet 30 and the rod guide 2 may be separated from each other, and the sheet 30 alone may receive a rebound load. However, in this case, unless the sheet 30 is set to have high strength so as to withstand a large load. Don't be. Further, the seat 30 and the rod guide 2 must be individually fixed to the cylinder 1, and the structure becomes complicated.
- an inclined surface 2e that is gradually reduced in diameter toward the sheet 30 side end (lower end) and opposed to the notch 30e is formed on the outer periphery of the rod guide 2, and the rod guide 2 On the sheet 30 side (lower part), a bottom groove 2f is formed along the radial direction.
- the communication passage P includes an annular passage 20 formed between the inclined surface 2e and the cylinder 1, and a lateral passage 21 formed between the bottom groove 2f and the seat 30.
- the vertical passage 33 formed by the notch 30e via the annular passage 20 and the bottom groove 2f and the sheet 30 are formed without aligning the notch 30e and the bottom groove 2f.
- the shock absorber A can be easily assembled.
- the annular passage 20 may be eliminated if the notch 30e and the bottom groove 2f are aligned so that the longitudinal passage 33 and the transverse passage 21 can always communicate with each other.
- a lateral groove 30g extending in the radial direction from the notch 30e to the sheet center side is formed on the rod guide 2 side (upper part) of the sheet 30.
- the communication path P may be constituted by a horizontal path 34 formed between the horizontal groove 30g and the rod guide 2 and a vertical path 33 formed by the notch 30e.
- a cutout 30e is formed in the outer peripheral portion of the sheet 30, and the communication passage P includes a vertical passage 33 formed by the cutout 30e.
- the working chamber L side opening in the communication passage P can be moved as far as possible to the outer peripheral side, so that the design freedom of the rebound cushion 31 can be improved.
- the configuration of the communication path P and the shape of the seat 30 are not limited to the above, and may be changed as appropriate as long as the rebound cushion 31 is set not to overlap the opening on the working chamber L side of the communication path P. Is possible.
- the shock absorber A includes a cylinder 1 in which a working chamber L is formed, an annular rod guide 2 fixed to an upper (one side) opening of the cylinder 1, and the rod.
- An annular seat 30 fixed to the working chamber L side of the guide 2, a rod guide 2, a rod 4 inserted through the inner peripheral side of the seat 30 movably in the axial direction, and an inner periphery of the rod guide 2.
- the annular oil seal 10 that is in sliding contact with the outer peripheral surface of the rod 4, the rebound cushion 31 that is attached to the outer periphery of the rod 4 inserted into the cylinder 2 and abuts against the seat 30 at the maximum extension, and the pressure in the working chamber L
- a communication path P that communicates with the oil seal 10 is provided.
- the opening (notch 30e) on the working chamber L side of the communication path P is disposed on the outer peripheral side of the seat 30 where the rebound cushion 11 abuts (the abutting portion 30a).
- the surface of the seat 30 that receives the rebound cushion 31 is as smooth as possible even when the communication path P passes through the seat 30 and the rebound cushion 31 attached to the outer periphery of the rod 4 abuts against the seat 30. Therefore, it is possible to prevent the rebound cushion 31 from being damaged and to make the rebound cushion 31 last longer.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
Claims (5)
- 内部に作用室が形成されるシリンダと、このシリンダの一方側開口部に固定される環状のロッドガイドと、このロッドガイドの上記作用室側に固定される環状のシートと、上記ロッドガイドと上記シートの内周側に軸方向に移動可能に挿通されるロッドと、上記ロッドガイドの内周に保持されて上記ロッドの外周面に摺接する環状のオイルシールと、上記シリンダ内に挿入される上記ロッドの外周に取り付けられて最伸長時に上記シートに突き当たるリバウンドクッションと、上記作用室の圧力を上記オイルシールに伝える連通路とを備え、
上記連通路の上記作用室側の開口は、上記シートにおいて上記リバウンドクッションが突き当たる部分よりも外周側に配置される緩衝器。 - 請求項1に記載の緩衝器であって、
上記シートの外周部には、切欠が形成されており、上記連通路は、上記切欠によって形成される縦通路を備える緩衝器。 - 請求項2に記載の緩衝器であって、
上記ロッドガイドの外周には、上記シート側端に向けて徐々に縮径されて上記切欠に対向する傾斜面が形成されるとともに、上記ロッドガイドの上記シート側には、径方向に沿う底溝が形成されており、
上記連通路は、上記傾斜面と上記シリンダとの間に形成される環状通路と、上記底溝と上記シートとの間に形成される横通路とを備える緩衝器。 - 請求項2に記載の緩衝器であって、
上記シートの上記ロッドガイド側には、上記切欠からシート中心側に径方向に沿って延びる横溝が形成されており、上記連通路は、上記横溝と上記ロッドガイドとの間に形成される横通路を備える緩衝器。 - 請求項1に記載の緩衝器であって、
上記シートは、上記ロッドガイドに当接している緩衝器。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US15/304,881 US9995361B2 (en) | 2014-05-19 | 2015-05-14 | Damper |
CN201580025423.1A CN106460997B (zh) | 2014-05-19 | 2015-05-14 | 缓冲器 |
MX2016015037A MX2016015037A (es) | 2014-05-19 | 2015-05-14 | Amortiguador. |
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JP2014103011A JP6374701B2 (ja) | 2014-05-19 | 2014-05-19 | 緩衝器 |
JP2014-103011 | 2014-05-19 |
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WO2015178285A1 true WO2015178285A1 (ja) | 2015-11-26 |
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PCT/JP2015/063929 WO2015178285A1 (ja) | 2014-05-19 | 2015-05-14 | 緩衝器 |
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US (1) | US9995361B2 (ja) |
JP (1) | JP6374701B2 (ja) |
CN (1) | CN106460997B (ja) |
MX (1) | MX2016015037A (ja) |
WO (1) | WO2015178285A1 (ja) |
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JP6412339B2 (ja) * | 2014-05-19 | 2018-10-24 | Kyb株式会社 | 緩衝器 |
JP6845643B2 (ja) * | 2016-09-20 | 2021-03-24 | Kyb株式会社 | ショックアブソーバ |
JP2018048719A (ja) * | 2016-09-23 | 2018-03-29 | Kyb株式会社 | 緩衝器 |
DE102017112998A1 (de) * | 2017-06-13 | 2018-12-13 | Thyssenkrupp Ag | Schwingungsdämpfer |
JP7002376B2 (ja) * | 2018-03-15 | 2022-02-04 | Kyb株式会社 | ショックアブソーバ |
JP6978965B2 (ja) * | 2018-03-15 | 2021-12-08 | Kyb株式会社 | ショックアブソーバ |
US11536346B2 (en) | 2018-03-15 | 2022-12-27 | Kyb Corporation | Shock absorber |
IT201800007447A1 (it) * | 2018-07-23 | 2020-01-23 | Complesso anulare di tenuta di guida per ammortizzatore monotubo | |
US11365781B2 (en) * | 2019-10-11 | 2022-06-21 | DRiV Automotive Inc. | Method of manufacturing a monotube shock absorber |
WO2022107516A1 (ja) * | 2020-11-18 | 2022-05-27 | Nok株式会社 | 密封装置 |
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JP2005016721A (ja) * | 2003-05-30 | 2005-01-20 | Tokico Ltd | 単筒式緩衝器 |
JP2009036259A (ja) * | 2007-07-31 | 2009-02-19 | Kayaba Ind Co Ltd | 緩衝器 |
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US20170138432A1 (en) | 2017-05-18 |
CN106460997A (zh) | 2017-02-22 |
JP2015218817A (ja) | 2015-12-07 |
JP6374701B2 (ja) | 2018-08-15 |
CN106460997B (zh) | 2019-10-15 |
US9995361B2 (en) | 2018-06-12 |
MX2016015037A (es) | 2017-03-31 |
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