WO2020174906A1 - 緩衝器 - Google Patents
緩衝器 Download PDFInfo
- Publication number
- WO2020174906A1 WO2020174906A1 PCT/JP2020/001001 JP2020001001W WO2020174906A1 WO 2020174906 A1 WO2020174906 A1 WO 2020174906A1 JP 2020001001 W JP2020001001 W JP 2020001001W WO 2020174906 A1 WO2020174906 A1 WO 2020174906A1
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- WO
- WIPO (PCT)
- Prior art keywords
- passage
- valve
- valve seat
- damping force
- sub
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/06—Characteristics of dampers, e.g. mechanical dampers
- B60G17/08—Characteristics of fluid dampers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G13/00—Resilient suspensions characterised by arrangement, location or type of vibration dampers
- B60G13/02—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally
- B60G13/06—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally of fluid type
- B60G13/08—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally of fluid type hydraulic
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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
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
- F16F9/182—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein comprising a hollow piston rod
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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
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
- F16F9/185—Bitubular 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
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
- F16F9/348—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body
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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
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
- F16F9/348—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body
- F16F9/3484—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body characterised by features of the annular discs per se, singularly or in combination
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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
- F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
- F16F9/512—Means responsive to load action, i.e. static load on the damper or dynamic fluid pressure changes in the damper, e.g. due to changes in velocity
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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
- F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
- F16F9/512—Means responsive to load action, i.e. static load on the damper or dynamic fluid pressure changes in the damper, e.g. due to changes in velocity
- F16F9/5126—Piston, or piston-like valve elements
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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
- F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
- F16F9/516—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics resulting in the damping effects during contraction being different from the damping effects during extension, i.e. responsive to the direction of movement
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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
- B60G2202/24—Fluid damper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/62—Adjustable continuously, e.g. during driving
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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
- B60G2500/00—Indexing codes relating to the regulated action or device
- B60G2500/10—Damping action or damper
- B60G2500/104—Damping action or damper continuous
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2500/00—Indexing codes relating to the regulated action or device
- B60G2500/10—Damping action or damper
- B60G2500/11—Damping valves
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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
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/12—Fluid damping
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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
- F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
- F16F2228/06—Stiffness
- F16F2228/066—Variable stiffness
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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
- F16F2232/00—Nature of movement
- F16F2232/08—Linear
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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
- F16F2234/00—Shape
- F16F2234/02—Shape cylindrical
Definitions
- the present invention relates to a shock absorber.
- the present application claims priority based on Japanese Patent Application No. 2 019-9-032740, filed in Japan on February 26, 2010, the contents of which are incorporated herein by reference.
- a shock absorber having two valves that open in the same stroke is disclosed (for example, see Patent Documents 1 to 3).
- Patent Document 1 Japanese Patent Laid-Open No. 20000-9-2 87763
- Patent Document 2 Japanese Patent Laid-Open No. 2 0 1 3-2 0 4 7 7 2
- Patent Document 3 Japanese Patent Laid-Open No. 20 18-0 7 6 9 20
- an object of the present invention is to provide a shock absorber capable of improving productivity.
- One aspect of the shock absorber of the present invention is: a first passage and a second passage in which the working fluid flows out from a chamber on the upstream side to a chamber on the downstream side in the cylinder by movement of the piston; A first damping force generating mechanism that generates a damping force and a ring-shaped valve seat member that is disposed in one of the chambers, and the first passage is parallel to the second passage. A second damping force generation mechanism that is provided in the passage and that generates a damping force; and the second damping force generation mechanism is provided at one side of the second passage formed in the valve seat member. Provided on the first sub valve and the other side ⁇ 02020/174906 2 ((171?2020/001001
- a second sub-valve, and a bottomed tubular cap member having an outer tubular portion and a bottom portion, wherein the cap member includes an inner tubular portion into which the piston rod can be inserted on an inner peripheral side of the bottom portion.
- the second damping force generating mechanism is formed and at least one part of the second damping force generating mechanism is housed.
- FIG. 1 A sectional view showing a shock absorber according to a first embodiment of the present invention.
- FIG. 2 is a partial cross-sectional view showing the periphery of the piston of the shock absorber according to the first embodiment of the present invention.
- FIG. 3 is a partial cross-sectional view showing the vicinity of the orifice of the shock absorber according to the first embodiment of the present invention.
- FIG. 4 is a partial cross-sectional view showing a sub-assembly including a cap member, a valve seat member and the like of the shock absorber according to the first embodiment of the present invention.
- FIG. 5 is a partial cross-sectional view showing the periphery of the piston of the shock absorber according to the second embodiment of the present invention.
- FIG. 6 is a partial cross-sectional view showing the periphery of the piston of the shock absorber according to the third embodiment of the present invention.
- FIG. 7 is a partial cross-sectional view showing the periphery of a piston of a shock absorber according to a fourth embodiment of the present invention.
- FIG. 8 is a partial cross-sectional view showing the periphery of the piston of the shock absorber according to the fifth embodiment of the present invention.
- FIG. 9 is a partial cross-sectional view showing the periphery of the piston of the shock absorber according to the sixth embodiment of the present invention.
- the lower side is described as "lower”.
- the shock absorber 1 of the first embodiment is a so-called multi-cylinder type hydraulic shock absorber, and includes a cylinder 2 in which an oil liquid (not shown) as a working fluid is enclosed. I am.
- the cylinder 2 has a cylindrical inner cylinder 3 and a bottomed cylindrical outer cylinder 4 having a larger diameter than the inner cylinder 3 and concentrically provided so as to cover the inner cylinder 3.
- a reservoir chamber 6 is formed between the inner cylinder 3 and the outer cylinder 4.
- the outer cylinder 4 is composed of a cylindrical body member 11 and a bottom member 12 which is fitted and fixed to the lower side of the body member 11 and closes the lower portion of the body member 11.
- a mounting eye 13 is fixed to the bottom member 12 at an outer position opposite to the body member 11.
- the shock absorber 1 is a piston slidably provided inside the inner cylinder 3 of the cylinder 2.
- the piston 18 defines two chambers in the inner cylinder 3; an upper chamber 19 which is one cylinder inner chamber and a lower chamber 20 (the other chamber) which is the other cylinder inner chamber. doing.
- the piston 18 is slidably provided in the cylinder 2 and divides the cylinder 2 into an upper chamber 19 on one side and a lower chamber 20 on the other side.
- the upper chamber 19 and the lower chamber 20 in the inner cylinder 3 are filled with oil as working fluid, and the reservoir chamber 6 between the inner cylinder 3 and the outer cylinder 4 is filled with oil as working fluid. And gas are enclosed.
- the shock absorber 1 includes a biston rod in which one end side portion in the axial direction is arranged inside the inner cylinder 3 of the cylinder 2 and is connected and fixed to the piston 18, and the other end side portion is extended to the outside of the cylinder 2.
- the Viston rod 21 penetrates the upper chamber 19 and does not penetrate the lower chamber 20. Therefore, the upper chamber 19 is a rod-side chamber through which the piston rod 21 passes, and the lower chamber 20 is a bottom-side chamber on the bottom side of the cylinder 2.
- the rod guide 22 is fitted to the upper end opening side of the inner cylinder 3 and the outer cylinder 4.
- the seal member 23 is fitted over the outer cylinder 4, which is the outer side of the cylinder 2 with respect to the rod guide 22. Both the rod guide 22 and the seal member 23 are annular.
- the piston rod 21 is slidably inserted inside each of the rod guide 22 and the seal member 23 and extends from the inside of the cylinder 2 to the outside. One end of the piston rod 21 in the axial direction is fixed to the piston 18 inside the cylinder 2, the other end of the piston rod 21 is outside the cylinder 2, and the rod guide 2 2 and the seal member 2 3 Protruding through.
- the rod guide 22 supports the viston rod 21 so as to be axially movable while restricting its radial movement, and guides the movement of this piston rod 21.
- the seal member 23 is in close contact with the outer cylinder 4 at its outer peripheral portion, and slidably contacts with the outer peripheral portion of the piston rod 21 moving in the axial direction at its inner peripheral portion. As a result, the seal member 23 prevents the oil liquid in the inner cylinder 3 and the high-pressure gas and the oil liquid in the reservoir chamber 6 in the outer cylinder 4 from leaking to the outside.
- the rod guide 22 has a step-like outer peripheral portion in which the upper portion has a larger diameter than the lower portion.
- the rod guide 22 is fitted to the inner peripheral part of the upper end of the inner cylinder 3 at the lower part of the small diameter, and is fitted to the inner peripheral part of the upper part of the outer cylinder 4 at the upper part of the large diameter.
- a base valve 25 that defines a lower chamber 20 and a reservoir chamber 6 is installed on the bottom member 12 of the outer cylinder 4.
- the inner circumference of the lower end of the inner cylinder 3 is fitted to the base valve 25.
- the upper end of the outer cylinder 4 is swaged inward in the radial direction to form a locking portion 26.
- the locking member 26 and the rod guide 22 sandwich the seal member 23.
- the piston rod 21 has a main shaft portion 27 and a mounting shaft portion 28 having a smaller diameter than the main shaft portion 27.
- the main shaft portion 27 is slidably fitted to the rod guide 2 2 and the seal member 23, and the mounting shaft portion 28 is arranged in the cylinder 2 so that it can be attached to the piston 18 etc. It is connected.
- Main shaft 2 7 mounting shaft 2 8 side ⁇ 02020/174906 5 ((171?2020/001001
- the end of is a step portion 29 that spreads in the direction orthogonal to the axis.
- a pair of passage cutouts 30 extending in the axial direction are formed in the outer peripheral portion of the mounting shaft portion 28 at an axially intermediate position, and are formed on the opposite side of the main shaft portion 27 in the axial direction.
- a male thread 3 1 is formed at the tip position.
- the passage notch 30 has a so-called width across flats formed by notching two positions of the mounting shaft 28 which are different from each other in the circumferential direction by 180 degrees in parallel with each other in a plane. ..
- a protruding portion of the Biston rod 21 from the cylinder 2 is arranged at an upper portion and is supported by the vehicle body, and a mounting eye 13 on the cylinder 2 side is arranged at a lower portion and is connected to a wheel side.
- the cylinder 2 side may be supported by the vehicle body and the piston rod 21 may be connected to the wheel side.
- the piston 18 is attached to the piston rod 21 and a metal-made viston body 35, which is integrally attached to the outer peripheral surface of the viston body 35, so that the inner cylinder 3 It is composed of an annular synthetic resin sliding member 36 that slides on the.
- the piston main body 35 has an annular main body portion 34.
- a plurality of passage holes 37 (only one power point is shown due to the sectional view in FIG. 2) capable of communicating the upper chamber 19 and the lower chamber 20 with each other, and the upper chamber 19 and the lower chamber 20 with each other.
- a plurality of passage holes 39 (only one power point is shown in the sectional view in FIG. 2) are provided to allow communication with the chamber 20.
- the piston body 35 is a sintered product.
- the passage holes 37 and 39 are formed during sintering. Alternatively, the passage holes 37 and 39 are cut and formed by a drill.
- the plurality of passage holes 37 are formed at equal intervals in the circumferential direction of the piston main body 35 with the passage hole 39 at one power place interposed therebetween. Make up half of the.
- the plurality of passage holes 37 have a crank shape having two bending points.
- Plural passage holes 37 have one axial side of piston 18 (upper side in Fig. 2) on the outside in the radial direction of piston 18 and one axial side of piston 18 (lower side in Fig. 2) on the other side. It is opened inward in the radial direction of the piston 18 rather than on the side.
- a first damping force generating mechanism 41 for generating force is provided.
- the passages in the multiple passage holes 37 move toward the upper chamber 19 side of the piston 18 and thus the extension stroke.
- the passage is on the extension side where the oil liquid flows out from the upper chamber 19 on the upstream side to the lower chamber 20 on the downstream side.
- the first damping force generating mechanism 41 provided for the passages in the passage holes 37 suppresses the flow of the oil liquid from the passages in the passage holes 37 on the extension side to the lower chamber 20 to reduce the flow. It is a mechanism for generating damping force on the extension side that generates damping force.
- the remaining half of the passage holes 3 7 and 3 9 are formed in the circumferential direction of the piston body 35 by sandwiching the passage hole 37 at one power point between them. It is formed with a pitch.
- the multiple passage holes 39 have a crank shape with two bending points, and the other side in the axial direction of the piston 18 (the lower side in Fig. 2) is located outside the piston 18 in the radial direction, and the piston 1 One side in the axial direction of 8 (upper side in Fig. 2) is open to the inside in the radial direction of piston 18 than the other side.
- a first damping force generating mechanism 42 for generating a damping force by opening and closing the passage in the passage hole 39 is provided on the upper chamber 19 side of the passage hole 39.
- the passages in the multiple passage holes 39 move toward the lower chamber 20 side of the piston 18 and thus the contraction stroke.
- the passage is on the contraction side where the oil liquid flows out from the lower chamber 20 on the upstream side to the upper chamber 19 on the downstream side.
- the first damping force generating mechanism 42 provided for the passage in these passage holes 39 suppresses the flow of the oil liquid from the passage in the contraction-side passage hole 39 to the upper chamber 19 and reduces it. It is a contraction-side damping force generation mechanism that generates damping force.
- the piston body 35 has a substantially disc shape. At the center of the piston body 35 in the radial direction, a coin insertion hole 4 4 into which the mounting shaft portion 28 of the piston rod 21 is inserted is formed so as to penetrate in the axial direction.
- the insertion hole 4 4 has a small diameter hole 45 on one side in the axial direction where the mounting shaft 28 of the piston rod 21 is fitted, and a large diameter on the other side in the axial direction larger than the small diameter hole 45. It has holes 46.
- the piston 18 is fitted to the mounting shaft 28 in the small diameter hole 45, so that the diameter of the piston 18 is smaller than that of the mounting shaft 28. ⁇ 02020/174906 7 ⁇ (: 171-12020/001001
- the main body portion is located on the inner side in the radial direction of the piston body 35 rather than the opening of the passage hole 37 on the lower chamber 20 side.
- An annular inner seat portion 47 is formed which projects more axially than 34.
- the first damping force is generated on the outer side in the radial direction of the piston body 35 rather than the opening on the lower chamber 20 side of the passage hole 37.
- An annular valve seat portion 48 which constitutes a part of the mechanism 41, is formed so as to project more in the axial direction than the main body portion 34.
- An annular inner seat portion 49 that protrudes more axially than the main body portion 34 is formed inside the piston body 35 in the radial direction with respect to the opening on the 9th side.
- the first damping member should be located on the outer side in the radial direction of the piston body 35 rather than the opening on the upper chamber 19 side of the passage hole 39.
- An annular valve seat portion 50 forming a part of the force generating mechanism 42 is formed so as to project in the axial direction from the main body portion 34.
- a large-diameter hole portion 46 of the coin insertion hole 44 of the piston body 35 is provided closer to the inner seat portion 47 side in the axial direction than the small-diameter hole portion 45.
- the passage in the large diameter hole 46 of the piston body 35 is in constant communication with the passage in the passage cutout 30 of the piston rod 21.
- the main body portion 34 radially outside the valve seat portion 48 has a stepped shape having a lower axial height than the valve seat portion 48.
- An opening on the lower chamber 20 side of the contraction-side passage hole 39 is arranged in the stepped portion of the piston body 35.
- the main body portion 34 radially outside the valve seat portion 50 has a stepped shape having a lower axial height than the valve seat portion 50.
- An opening on the side of the upper chamber 19 of the passage hole 37 on the extension side is arranged in this stepped portion.
- the first damping force generating mechanism 42 on the contraction side includes the valve seat portion 50 of the piston 18 and, in order from the piston 18 side in the axial direction, one disc 62 and ⁇ 02020/174906 8 ⁇ (: 171?2020/001001
- the discs 62 to 6 6 and the annular member 6 7 are made of metal, and each has a circular plate shape with a hole having a certain thickness to which the mounting shaft portion 28 of the piston rod 21 can be fitted. There is.
- the discs 62 to 66 and the annular member 67 are fitted in the mounting shaft portion 28, so that they are positioned in the radial direction with respect to the mounting shaft portion 28.
- the disc 62 has an outer diameter that is larger than the outer diameter of the inner seat portion 49 of the piston 18 and smaller than the inner diameter of the valve seat portion 50. Always in contact with 9.
- the plurality of discs 63 have an outer diameter substantially equal to the outer diameter of the valve seat portion 50 of the piston 18 and can be seated on the valve seat portion 50.
- the outer diameters of the plurality of disks 64 are smaller than the outer diameter of the disks 63.
- the disc 65 has an outer diameter smaller than the outer diameter of the disc 64 and smaller than the outer diameter of the inner seat portion 49 of the piston 18.
- the disc 6 6 has a larger outer diameter than the disc 6 4 and a smaller outer diameter than the disc 6 3.
- the annular member 67 has an outer diameter smaller than the outer diameter of the disc 66 and larger than the outer diameter of the shaft step portion 29 of the piston rod 21.
- the annular member 67 is thicker and more rigid than the disks 62 to 66, and is in contact with the shaft step portion 29.
- the plurality of discs 63 and the plurality of discs 64 constitute the main valve 71 on the contraction side that can be seated on and detached from the valve seat portion 50.
- the main valve 71 is separated from the valve seat portion 50 so that the passage in the passage hole 39 communicates with the upper chamber 19 and the flow of the oil liquid between the valve seat portion 50 is suppressed.
- the annular member 67 restricts the deformation of the main valve 71 in the opening direction more than the specified amount by the disc 66. ⁇ 02020/174906 9 ⁇ (: 171?2020/001001
- the passage between the main valve 71 and the valve seat portion 50, which appears when the valve is opened, and the passage in the passage hole 39 are moved to the lower chamber 20 side of the piston 18 so that the cylinder 2
- the first passage 7 2 on the contraction side where the oil liquid flows out from the lower chamber 20 on the upstream side to the upper chamber 19 on the downstream side is formed.
- the contraction-side first damping force generating mechanism 42 that generates a damping force includes a main valve 7 1 and a valve seat portion 50. Therefore, the first damping force generating mechanism 42 on the contraction side is provided in the first passage 72.
- the first passage 72 is formed in the piston 18 including the valve seat portion 50, and the oil liquid passes when the Viston rod 21 and the viston 18 move to the contraction side.
- both the valve seat portion 50 and the main valve 71 abutting on the valve seat portion 50 are in contact with the upper chamber even if they are in contact with each other.
- the fixed orifice that connects 19 and lower chamber 20 is not formed. That is, the first damping force generating mechanism 42 on the contraction side connects the upper chamber 19 and the lower chamber 20 if the valve seat 50 and the main valve 71 are in contact with each other over the entire circumference. There is nothing to do.
- the first passage 7 2 does not have a fixed orifice that constantly connects the upper chamber 19 and the lower chamber 20 and is not a passage that always connects the upper chamber 19 and the lower chamber 20. ..
- the first damping force generation mechanism 42 is in a valve closed state when the Viston rod 21 and the viston 18 move to the extension side, and does not allow the oil liquid to pass through the first passage 72.
- the first damping force generating mechanism 41 on the extension side includes the valve seat portion 48 of the Viston 18 and, in order from the piston 18 side in the axial direction, one disc 82 and the same inner diameter. And a plurality of (specifically, five) disks 83 having the same outer diameter. A plurality of discs 8 4 having the same inner diameter and the same outer diameter (specifically, 3 discs) are provided on the opposite side of the disc 8 3 from the disc 8 2. Disks 8 2 to 8 4 are made of metal, and all have a circular plate shape with a hole having a certain thickness that allows the mounting shaft part 28 of the piston rod 21 to fit inside. By being fitted to the part 28, it is positioned in the radial direction with respect to the mounting shaft part 28. ⁇ 02020/174906 10 ((171?2020/001001
- the disc 8 2 has an outer diameter that is larger than the outer diameter of the inner seat portion 4 7 of the piston 18 and smaller than the inner diameter of the valve seat portion 48. It is always in contact with 7.
- the disk 82 has the passage in the passage hole 37 connected to the passage in the large diameter hole 46 of the piston 18 and the passage in the passage notch 30 of the piston rod 21.
- a notch portion 8 8 which is always communicated is formed from a position outside the inner seat portion 47 in the radial direction to an inner peripheral edge portion.
- the plurality of discs 8 3 have an outer diameter substantially equal to the outer diameter of the valve seat portion 48 of the piston 18 and can be seated on the valve seat portion 4 8.
- the disc 84 has an outer diameter smaller than the outer diameter of the disk 83 and smaller than the outer diameter of the inner seat portion 47 of the piston 18.
- the plurality of discs 8 3 constitute an extension-side main valve 91 which can be seated on and detached from the valve seat portion 48.
- the main valve 91 is separated from the valve seat portion 48 so that the passage in the passage hole 37 communicates with the lower chamber 20 and the flow of oil liquid between the valve seat portion 48 is suppressed. And generate a damping force.
- the first passage 92 is formed on the extension side where the oil liquid flows from the upper chamber 19 on the upstream side in the cylinder 2 to the lower chamber 20 on the downstream side by the movement of the.
- the extension-side first damping force generating mechanism 41 that generates the damping force includes the main valve 91 and the valve seal portion 48, and thus is provided in the first passage 92.
- the first passage 92 is formed in the piston 18 including the valve seat portion 48, and the oil liquid passes when the Viston rod 21 and the viston 18 move to the extension side.
- both the valve seat portion 48 and the main valve 91 which abuts against this, the upper chamber 19 and A fixed orifice that communicates with the lower chamber 20 is not formed. That is, the first damping force generating mechanism 41 on the extension side connects the upper chamber 19 and the lower chamber 20 if the valve seat portion 48 and the main valve 91 are in contact with each other over the entire circumference. ⁇ 02020/174906 11 11 (:171?2020/001001
- the first passage 92 does not have a fixed orifice that constantly connects the upper chamber 19 and the lower chamber 20 and is not a passage that always connects the upper chamber 19 and the lower chamber 20. ..
- the first damping force generating mechanism 41 is in a closed state when the piston rod 21 and the piston 18 move to the contraction side, and does not allow the oil liquid to pass through the first passage 92.
- a plurality of discs of the same inner diameter and the same outer diameter are provided on the side opposite to the piston 18 of the plurality of discs 8 4, in order from the piston 18 side.
- One disc 10 2 with the same outer diameter as the disc 10 1 one valve seat member 10 5 with one sealing member 10 3 on the outer peripheral side, the same inner diameter and the same
- a member 108, a disk 110, and an annular member 111 are provided with the mounting shaft portions 28 of the piston rod 21 being passed through the inside thereof.
- a male screw 3 1 is formed in a portion of the mounting shaft portion 28 of the Viston rod 21 that projects toward the side opposite to the piston 18 with respect to the annular member 1 11.
- the nut 1 1 2 is screwed to this talent screw 3 1.
- the nut 1 1 1 2 is in contact with the annular member 1 1 1.
- the discs 1 0 1, 1 0 2 ,1 0 6 ,1 0 7 ,1 1 0, the valve seat member 1 05, the cap member 1 08 and the annular member 1 1 1 are all made of metal. is there.
- the seal member 103 is made of an elastic material such as rubber.
- the discs 10 1, 1 0 2 ,1 0 6, 1 0 7 ,1 1 0 and the annular member 1 1 1 are all of a certain thickness that allows the mounting shaft 28 of the piston rod 2 1 to be fitted inside. It has a circular plate shape with a hole and is fitted to the mounting shaft portion 28 to be positioned in the radial direction with respect to the mounting shaft portion 28.
- Both the cap member 108 and the valve seat member 105 are formed in an annular shape so that the mounting shaft portion 28 of the piston rod 21 can be slid inside.
- the cap member 108 is fitted to the mounting shaft portion 28 of the piston rod 21 so that it is positioned in the radial direction with respect to the mounting shaft portion 28.
- the cap member 108 is an integrally molded product having a cylindrical shape with a bottom, and is a metal plate having a constant thickness. ⁇ 02020/174906 12 ((171?2020/001001
- the cap member 108 is a cylindrical plate that extends from the outer peripheral edge portion of the bottom portion 1 2 2 to the one side along the axial direction of the bottom portion 1 2 2 and the bottom portion 1 2 2 of the circular flat plate with a hole.
- Aperture expansion that extends from the outer edge of the outer cylinder 1 2 4 and the end of the outer cylinder 1 2 4 on the side opposite to the axial bottom 1 2 2 in the direction opposite to the bottom 1 2 2.
- a portion 1 2 5 and a cylindrical inner tubular portion 1 2 6 extending from the inner peripheral edge portion of the bottom portion 1 2 2 to the same side as the outer tubular portion 1 2 4 along the axial direction of the bottom portion 1 2 2. have.
- the bottom portion 122, the outer tubular portion 1224, the opening enlarged diameter portion 125 and the inner tubular portion 126 are arranged coaxially.
- the opening enlarged diameter portion 125 has an arc-shaped cross section in a plane including the central axis of the cap member 108.
- the inner tubular portion 1 26 has a shorter axial length than the outer tubular portion 1 2 4, and the expanded diameter portion 1 2 5 as a whole has a bottom portion 1 2 6 in the axial direction rather than the inner tubular portion 1 2 6. It is located on the opposite side of 2.
- the inner cylindrical portion 1 2 6 has a chamfered 1 2 7 formed all around the outer peripheral edge of the end opposite to the axial bottom portion 1 2 2, and also on the inner peripheral edge of the same end.
- a chamfer 1 28 is formed all around.
- the piston rod 21 can be kneaded into the inner cylindrical portion 126 on the inner peripheral side of the bottom portion 122.
- the cap member 108 is arranged so that the bottom portion 1 2 2 faces the side opposite to the piston 18 and is attached to the mounting shaft portion 2 8 of the Biston rod 2 1 at the inner peripheral portion of the inner tubular portion 1 2 6. Mated. As a result, the cap member 108 is positioned in the radial direction with respect to the mounting shaft portion 28 including the inner cylindrical portion 1 26.
- the valve seat member 105 has a substantially disc shape having an outer diameter smaller than the inner diameter of the outer tubular portion 1 24 of the cap member 108.
- the valve seat member 105 has a perforated circular flat plate-shaped main body 1 3 2 formed with a through hole 1 3 1 for penetrating the mounting shaft 28 through the thickness direction at the center in the radial direction.
- Have The through-hole 1 3 1 has a small diameter hole 1 29 on one side in the axial direction and a large diameter hole 1 30 on the other side in the axial direction that is larger in diameter than the small diameter hole 1 29. ..
- the valve seat member 105 is arranged on the large diameter hole 1300 side in the axial direction of the main body 1 3 2 in order from the inner side in the radial direction of the main body 1 3 2 to the inner seat 1 3 4, ⁇ 02020/174906 13 13 (:171?2020/001001
- valve seat member 105 has an inner seat portion 1 3 8 and a valve seat portion 1 3 9 on the small diameter hole portion 1 29 side in the axial direction in order from the inside in the radial direction of the main body portion 1 3 2. There is.
- the inner sheet portion 1 3 4 has an annular shape, and projects from the inner peripheral edge portion of the main body portion 1 3 2 to one side along the axial direction of the main body portion 1 3 2.
- the intermediate valve seat part 1 3 5 also has an annular shape, and is located in the axial direction of the main body part 1 3 2 from the radial intermediate position of the main body part 1 3 2 which is outside the inner seat part 1 3 4.
- the outer valve seat portion 1 3 6 also has an annular shape, and is arranged in the axial direction of the main body portion 1 3 2 from the radially outer side of the main body portion 1 3 2 which is outside the intermediate valve seat portion 1 3 5. It projects along the same side as the inner seat portion 1 3 4.
- the inner seat portion 1 3 8 also has an annular shape, and is opposite to the inner seat portion 1 3 4 from the inner peripheral edge portion of the main body portion 1 3 2 along the axial direction of the main body portion 1 3 2. It projects to the side.
- Each of the inner sheet portions 1 3 4 and 1 3 8 has a through hole 1 3 1 on the radially inner side.
- the valve seat part 1 3 9 also has an annular shape, and extends along the axial direction of the main body part 1 3 2 from the intermediate position in the radial direction of the main body part 1 3 2 on the outer side of the inner seal part 1 3 8. It projects on the same side as the inner seat portion 1 3 8.
- the intermediate valve seat 1 3 5 and the valve seat 1 3 9 have the same inner diameter and the same outer diameter.
- the main body portion 1 3 2 includes an inner seat portion 1 3 4 and 1 3 8 and an intermediate valve seat portion.
- An inner passage hole 1 41 that axially penetrates the main body 1 3 2 is formed between 1 3 5 and the valve seat portion 1 39.
- a plurality of inner passage holes 1 41 are formed at equal intervals in the circumferential direction of the main body 1 3 2.
- the main body 1 3 2 has a main body 1 3 2 located axially between the intermediate valve seat 1 3 5 and the outer valve seat 1 3 6 and radially outward of the valve seat 1 3 9. Outer passage hole penetrating in the direction
- the outer passage hole 1 4 3 is arranged on the outer side of the inner passage hole 1 4 1 in the radial direction of the main body portion 1 3 2, and is arranged in the circumferential direction of the main body portion 1 3 2. ⁇ 02020/174906 14 ⁇ (: 171?2020/001001
- a plurality of them are formed at equal intervals.
- the main body 1 3 2 is formed with an annular seal groove 1 4 5 which is recessed radially inward at an axially intermediate position of the outer peripheral portion.
- the seal member 10 3 is arranged in the seal groove 1 45.
- the seal member 103 is a ring, which is fitted over the entire circumference of the groove bottom surface of the seal groove 145, which is a cylindrical surface, with an interference.
- the valve seat member 105 has the inner seat portion 1 3 4, the intermediate valve seat portion 1 3 5 and the outer valve seat portion 1 3 6 facing toward the bottom portion 1 2 2 with the outer peripheral side
- the main body portion 13 2 is inserted into the outer cylindrical portion 1 24 of the cap member 108, and thus is housed in the cap member 108.
- the seal member 103 is fitted to the inner peripheral surface of the outer cylindrical portion 1 24 of the cap member 108 with a tight margin over the entire circumference, and is elastically deformed to the outside. Seal the gap between the cylinder 1 2 4 and the main body 1 3 2 of the valve seat member 105.
- valve seat member 105 is fitted into the inner cylindrical portion 1 26 of the cap member 108 at the large diameter hole portion 130 of the through hole 1 31.
- the valve seat member 105 is positioned in the radial direction with respect to the inner cylinder portion 126 of the cap member 108.
- the cap member 108, the valve seat member 105 and the seal member 103 constitute a housing 147 that forms a cap chamber 146 inside.
- the cap chamber 146 is provided in the housing 147 between the bottom portion 122 of the cap member 108 and the valve seat member 105.
- the plurality of discs 107 and the plurality of discs 10 6 are provided in the cap chamber 1 46.
- the intermediate valve seat portion 1 3 5 and the outer valve seat portion 1 3 6 are arranged on the cap chamber 1 46 side, and the valve seat portion 1 3 9 is arranged on the lower chamber 20 side.
- the housing 1 47, including the annular valve seat member 10 5 is arranged in the lower chamber 20.
- the valve seat member 105 divides the cap chamber 146 and the lower chamber 20 so as to face both the cap chamber 146 and the lower chamber 20.
- the plurality of discs 10 6 are arranged on the outer valve seat portion 1 3 6 of the valve seat member 1 05. ⁇ 02020/174906 15 ((171?2020/001001).
- the outer diameter is substantially the same as the outer diameter
- the inner diameter is the same as the outer diameter of the inner cylindrical portion 1 26 of the cap member 108.
- the plurality of discs 106 are fitted to the outer peripheral part of the inner cylindrical part 126 of the cap member 108 at the inner peripheral part. As a result, the plurality of discs 106 are positioned in the radial direction with respect to the inner cylindrical portion 126 of the cap member 108.
- the plurality of discs 10 6 are always in contact with the inner seat portion 1 3 4 and can be seated on the outer valve seat portion 1 3 6 and the intermediate valve seat portion 1 3 5.
- a plurality of discs 106 are formed with axial through-holes 1 61 at axially intermediate positions between the inner seat 1 3 4 and the intermediate valve seat 1 3 5, respectively. Has been done.
- the passage in the through hole 1 61 always connects the passage in the inner passage hole 1 41 of the valve seat member 105 to the cap chamber 1 4 6.
- the plurality of discs 10 7 have an outer diameter that is smaller than the outer diameter of the disc 10 6 and that is substantially the same as the outer diameter of the inner seat portion 1 3 4 of the valve seat member 10 5.
- the inner diameter is the same as the outer diameter of the inner cylindrical portion 1 26 of the cap member 108.
- the plurality of disks 107 are fitted to the outer peripheral portion of the inner cylindrical portion 1 26 of the cap member 108 at the inner peripheral portion. As a result, the plurality of discs 107 are positioned in the radial direction with respect to the inner cylindrical portion 126 of the cap member 108.
- the disc 102 has an outer diameter that is substantially the same as the outer diameter of the valve seat portion 139 of the valve seat member 105.
- the disc 102 is always in contact with the inner seat portion 1338 and can be seated on the valve seat portion 1339.
- the plurality of discs 10 1 have an outer diameter substantially equal to the outer diameter of the disc 10 2, and are stacked on the opposite side of the disc 10 2 from the valve seat member 105.
- the passage in the inner passage hole 1 41 is provided with the passage in the small-diameter hole portion 1 29 of the valve seat member 105 and the passage of the Biston rod 21.
- a notch 1 65 that is in constant communication with the passage in the passage notch 30 is formed from an intermediate position inside the radial valve seal 1 39 and outside the inner seat 1 38 to the inner peripheral edge. ing.
- the cap chamber 1 46 is provided with a through hole 1 6 1 of the disc 10 6.
- ⁇ 02020/174906 16 ⁇ (: 171-12020/001001
- Inner passage the passage in the inner passage hole 1 41 of the valve seat member 105, the passage in the notch 1 65 of the disc 10 2, and the small diameter hole 1 2 of the valve seat member 105.
- the plurality of discs 106 constitutes a sub-valve 1 7 1 (second sub-valve) which can be seated on and detached from the outer valve seat portion 1 36 and the intermediate valve seat portion 1 35.
- the sub valve 1 71 is provided in the cap chamber 1 46, and
- the sub-valve 1 7 1 includes a passage in the outer passage hole 1 4 3, a cap chamber 1 46, a passage in the through holes 1 6 1 of a plurality of discs 10 6, and an inner passage hole 1 4 3.
- the sub-valve 1 71 suppresses the flow of the oil liquid between the sub-valve 1 71 and the outer valve seat portion 1 36 to generate a damping force.
- the sub-valve 1 7 1 is an inflow valve that opens when the oil liquid flows from the lower chamber 20 into the cap chamber 1 4 6 through the passage in the outer passage hole 1 4 3 and then from the cap chamber 1 4 6. It is a check valve that regulates the outflow of oil liquid to the lower chamber 20 via the passage in the outer passage hole 1 43.
- the passage in the passage hole 37 moves from the lower chamber 20 which is the upstream side in the cylinder 2 to the upper chamber 19 which is the downstream side by moving the piston 18 to the lower chamber 20 side. It constitutes the second passage 1 7 2 from which water flows out.
- the second passage 1 7 2 moves from the lower chamber 20 on the upstream side to the upper chamber 19 on the downstream side in the movement of the piston 18 to the lower chamber 20 side of the piston 18, that is, in the compression stroke. It becomes the passage on the contraction side where the water flows out.
- the second passage 1 7 2 includes a passage in a passage cutout 30 formed by cutting out the piston rod 21, in other words, a part of the passage is formed by cutting out the Biston rod 2 1. ing.
- a sub valve 1 71, an outer valve seat portion 1 3 6 and an intermediate valve seat portion 1 35 and a cap member 10 8 are provided in the second passage 1 7 2 on the contraction side, and A second damping force generation mechanism 1 73 on the compression side is configured to open and close the passage 1 72 to suppress the flow of oil liquid from the second passage 1 7 2 to the upper chamber 19 to generate a damping force.
- the second damping force generating mechanism 1 73 is provided with the outer valve seat portion 1 36 and the intermediate valve seat portion 1 35 on the valve seat member 1 05.
- the sub-valve 171 that constitutes the second damping force generating mechanism 173 on the contraction side is the sub-valve on the contraction side.
- the cap member 108 has a substantially constant thickness, and is thicker than the disk 1 06 that constitutes the sub-valve 1 7 1.
- the outer cylinder portion 1 2 4 and the inner cylinder portion 1 2 6 are formed on both sides in the radial direction, so that the bottom portion 1 2 2 has higher rigidity than the disc 1 0 6. Therefore, the bottom portion 122 of the cap member 108 abuts the sub-valve 171 and restricts the deformation thereof in the opening direction more than the specified amount.
- the passage in the cutout portion 1 65 of the disc 10 2 serves as an orifice 1 7 6 that is narrowed in a portion where the passage cross-sectional area is fixed, and the disc
- the passage in the notch 8 8 of 8 2 also becomes an orifice 1 7 5 in which the flow passage cross-sectional area is narrowed in the fixed portion.
- the orifices 1 7 5 and 1 7 6 are located downstream of the sub valve 1 7 1 of the oil flow when the sub valve 1 7 1 opens and oil flows through the second passage 1 7 2 on the contraction side. It is located in.
- the second damping force generating mechanism 1 73 on the contraction side is not contacted with any of the outer valve seat portion 1 36, the intermediate valve seat portion 1 3 5 and the sub-valve 1 7 1 contacting them. Even in the state, the fixed-length riffus that connects the lower chamber 20 and the upper chamber 19 is not formed. In other words, the second damping force generating mechanism 1 73 on the contraction side will not move down if the outer valve seat 1 3 6 and the intermediate valve seat 1 3 5 are in contact with the disc 10 6 over the entire circumference. Chamber 20 and upper chamber 19 are not in communication.
- the second passage 1 7 2 does not have a fixed orifice that constantly connects the lower chamber 20 and the upper chamber 19 and is not a passage that always connects the lower chamber 20 and the upper chamber 19. Absent.
- the second damping force generating mechanism 1773 is in a closed state when the piston rod 21 and the piston 18 move to the extension side, and does not allow the oil liquid to pass through the second passage 172.
- the second passage 17 2 on the contraction side that allows communication between the lower chamber 20 and the upper chamber 19 is also a passage on the contraction side that allows communication between the lower chamber 20 and the upper chamber 19 as well. It is parallel to one passage 72.
- a first damping force generating mechanism 42 is provided in the first passage 72, and a second damping force generating mechanism 1773 is provided in the second passage 1 72. Therefore, in both cases, the first damping force generating mechanism 42 and the second damping force generating mechanism 173 on the contraction side are arranged in parallel.
- the plurality of discs 8 4 have an outer diameter that is smaller than the outer diameter of the disc 10 1 and is substantially the same as the outer diameter of the inner seat portion 1 3 8 of the valve seat member 10 5.
- the disc 110 has an outer diameter that is larger than the inner diameter of the bottom portion 1 2 2 of the cap member 10 8 and smaller than the outer diameter of the bottom portion 1 22 2.
- the annular member 1 11 has a larger diameter than the outer diameter of the disc 1 110.
- the disc 102 and the plurality of discs 101 constitute a sub-valve 181 (first sub-valve) that can be seated on and detached from the valve seat portion 1339.
- Disc 102 and multiple discs 10 1 are larger than the outer diameter of disc 10 6 ⁇ 02020/174906 19 Small (:171?2020/001001 Small diameter and higher rigidity than disc 106.
- Sub valve 1 8 consisting of disc 1 0 2 and multiple discs 1 0 1 The 1 is also more rigid than the sub-valve 1 7 1, which consists of multiple disks 1 06.
- the sub-valve 181 is provided in the lower chamber 20 and has a valve seat portion 13
- the sub-valve 1 81 is a discharge valve that opens when oil liquid is discharged from the upper chamber 19 to the lower chamber 20 and is a reverse valve that closes and regulates the flow of oil liquid from the lower chamber 20 to the upper chamber 19. It is a stop valve.
- the second passage 18 2 communicates with the passage or the like in the cutout portion 1 65 of the disc 10 2 and the passage in the inner passage hole 1 4 1 of the valve seat member 10 5 and the disc 1 0 2. It includes a passage in six through holes 1 61 and a cap chamber 1 4 6.
- the second passage 18 2 moves from the upper chamber 19 on the upstream side to the lower chamber 20 on the downstream side in the movement of the piston 18 to the upper chamber 19 side of the piston 18, that is, in the extension stroke. It becomes the passage on the extension side where the water flows out.
- the second passage 1 82 includes a passage in a passage cutout 30 formed by cutting out the piston rod 21, in other words, a part of the passage is formed by cutting out the Biston rod 2 1. ing.
- the sub-valve 181 and the valve seat portion 139 are connected to each other by the second passage 18 on the extension side. ⁇ 02020/174906 20 units (: 171?2020/001001
- the second damping force on the extension side that is provided on the second side and that opens and closes the second passage 18 2 to suppress the flow of oil liquid from the second passage 18 2 to the lower chamber 20 to generate the damping force. It constitutes the generator structure 1 83.
- the valve seat portion 139 is provided on the valve seat member 105.
- the sub-valve 181 that constitutes the second damping force generating mechanism 183 on the extension side is the sub-valve on the extension side.
- the passage in the cutout portion 8 8 of the disc 8 2 becomes the orifice 1 7 5 which is narrowed in the portion where the passage cross-sectional area is fixed, and the disc 1 0
- the passage in the notch 2 165 of 2 also becomes an orifice 176 which is narrowed in the portion where the flow passage cross-sectional area is fixed.
- the orifices 175 and 176 are common to the second passages 172 and 182.
- the orifices 1 7 5 and 1 7 6 are located on the upstream side of the sub valve 1 8 1 of the oil liquid flow when the sub valve 1 8 1 opens and the oil liquid flows in the second passage 1 8 2 on the extension side. It is located in.
- an orifice 1 7 5 is arranged on the upstream side of the flow of the oil liquid when the sub valve 1 8 1 opens, and an orifice 1 7 6 is arranged on the downstream side.
- the second passage 182 may be provided with only one of the orifices 175 and 176.
- the orifice 1 75 is formed by notching the disk 8 2 of the first damping force generating mechanism 41, which is in contact with the piston 18, and the orifice 1 7 6 is formed by the second damping force generating mechanism. Of the 183, the disk 10 2 that abuts the valve seat member 105 is cut out.
- the second damping force generating mechanisms 1 7 3 and 1 8 3 are provided with a sub valve 1 8 1 on one side of the second passage 1 7 2 partially formed on the valve seat member 10 5 and a sub valve 1 8 3 on the other side.
- the sub-valve 1 7 1 is provided, and the sub-valve 1 8 1 is provided on the — side of the second passage 1 8 2 partially formed on the valve seat member 105, and the sub-valve 1 7 1 is provided on the other side. There is.
- the sub-valve 171 which is a part of the second damping force generation mechanism 1 73 and consists of a plurality of discs 10 6, and the outer valve seat 1 3 6 and the intermediate valve seat 1 3 5, Similarly, it is housed in the cap member 108 that also constitutes a part of the second damping force generating mechanism 1 73, and the valve seat member 10 5 and the seal member 10 3 are also included.
- ⁇ 02020/174906 21 ⁇ (: 171?2020/001001
- the cap member 108 accommodates the sub-valve 171, which is composed of a plurality of discs 106, the valve seat member 105, and the seal member 103. It should be noted that at least a part of the second damping force generating mechanisms 17 3 and 1 8 3 may be housed in the cap member 108.
- the disks 1 0 1 and 1 0 2 that compose the sub-valve 1 81 are the sub-valve 1 7
- the rigidity is higher than that of the disk 106 that composes 1, and the sub-valve 1 81 is higher than that of the sub-valve 1 7 1. Therefore, the sub-valve 1 71, which is the inflow valve from the lower chamber 20 to the cap chamber 1 46, has a higher opening pressure than the sub-valve 1 8 1, which is the discharge valve from the second passage 1 8 2 to the lower chamber 20. Is low.
- the sub/lube 1 8 1 and sub valve 1 7 1 are opened and closed independently.
- the second damping force generating mechanism 183 on the extension side is provided in both the valve seat portion 1339 and the sub-valve 181 abutting against the valve seat portion 139 even if these are in the abutting state. There is no fixed orifice that connects the lower chamber 20 with the lower chamber. That is, the second damping force generating mechanism 1 8 3 on the extension side has the upper chamber 19 and the lower chamber if the valve seat 1 39 and the sub valve 18 1 are in contact with each other over the entire circumference. It does not communicate with 20. In other words, the second passage 1 82 does not have a fixed orifice that constantly connects the upper chamber 19 and the lower chamber 20 and is not a passage that always connects the upper chamber 19 and the lower chamber 20. Absent. The second damping force generating mechanism 183 is in a closed valve state when the Viston rod 21 and the viston 18 move to the contraction side, and does not allow the oil liquid to pass through the second passage 1 82.
- the shock absorber 1 In the shock absorber 1, the upper chamber 19 and the lower chamber 20 have the first damping force generating mechanism 41, 42, and It is possible to communicate only via the second damping force generating mechanism 1 7 3 and 1 8 3. Therefore, the shock absorber 1 is not provided with a fixed orifice that constantly connects the upper chamber 19 and the lower chamber 20 at least on the passage of the oil liquid that axially passes through the inside of the piston 18.
- the second passage 182 on the extension side capable of communicating the upper chamber 19 and the lower chamber 20 has the same upper ⁇ 02020/174906 22 ((171?2020/001001) 1st passage 9 2 which is the extension side passage that can connect chamber 19 and lower chamber 20 and passage hole 3 7 on the upper chamber 1 9 side
- the first damping force generation mechanism 41 is provided in the first passage 92
- the second damping force generation mechanism 1 is provided in the second passage 182. Therefore, the first damping force generating mechanism 41 and the second damping force generating mechanism 183 on the extension side are arranged in parallel.
- the second damping force generation mechanisms 1 7 3 and 1 8 3 are composed of the valve seat member 105 and the valve seat member 10
- the sub-valve 1 7 1 provided on one side of the second passages 1 7 2 and 1 8 2 provided on 5 and the sub-valve 1 8 1 provided on the other side.
- the second damping force generating mechanism 1 73, 1 8 3 is provided with a bottomed cylindrical cap member 108 forming the second passage 1 72.
- the sub-valve 1 8 1 is provided on the lower chamber 20 side of the valve seat member 1 05, and the sub-valve 1 7 1 is located between the bottom portion 1 2 2 of the cap member 1 08 and the valve seat member 1 05. It is provided in the cap chamber 1 46.
- the base valve 25 described above is provided between the bottom member 12 of the outer cylinder 4 and the inner cylinder 3.
- This base valve 25 has a base valve member 191, which separates the lower chamber 20 and the reservoir chamber 6, and a disc 1 92 provided below the base valve member 1 91, that is, on the reservoir chamber 6 side.
- the disc 1 93 provided on the upper side of the base valve member 1 91, that is, the lower chamber 20 side, and the mounting pin 1 9 4 for mounting the disc 1 9 2 and the disc 1 9 3 on the base valve member 1 91.
- the base valve member 191 has an annular shape, and the mounting pin 194 is threaded through the center in the radial direction.
- the base valve member 191 has a plurality of passage holes 195 through which oil can flow between the lower chamber 20 and the reservoir chamber 6, and the base valve member 191 rather than these passage holes 195.
- a plurality of passage holes 196 through which the oil liquid can flow is formed between the lower chamber 20 and the reservoir chamber 6 on the outer side in the radial direction.
- the disc 192 on the reservoir chamber 6 side allows the oil liquid to flow from the lower chamber 20 to the reservoir chamber 6 through the passage hole 195, while the reservoir chamber 6 moves to the lower chamber 20.
- Communication ⁇ 02020/174906 23 ((171?2020/001001
- the disk 193 allows the oil liquid to flow from the reservoir chamber 6 to the lower chamber 20 through the passage hole 1966, while passing through the passage hole 196 from the lower chamber 20 to the reservoir chamber 6. Control the flow of oil and liquid.
- the disc 1 92 is opened by the base valve member 1 91 in the compression stroke of the shock absorber 1 to flow the oil liquid from the lower chamber 20 to the reservoir chamber 6 and to generate a damping force. It constitutes the damping valve mechanism 197.
- the suction valve mechanism 1998 generates a damping force from the reservoir chamber 6 to the lower chamber 20 so as to make up for the shortage of the liquid caused mainly by the extension of the piston rod 21 from the cylinder 2. Fulfills the function of flowing the oil liquid without
- the cap member 108, the plurality of discs 107, the plurality of discs 10 6 constituting the sub-valve 1 71, and the valve The seat member 105 and the seal member 103 are pre-assembled to form a subassembly 200.
- valve seat member with the seal member 103 mounted in the seal groove 145 [0088] Then, the valve seat member with the seal member 103 mounted in the seal groove 145.
- 10 5 is the direction in which the inner seat portion 1 3 4, the intermediate valve seat portion 1 3 5 and the outer valve seat portion 1 3 6 face toward the disc 1 0 6 side, and the outer peripheral portion of the main body portion 1 3 2 and the sealing member. Insert the outer circumference of 10 3 into the outer cylinder 1 2 4 of the cap member 10 8 and guide the seal member 10 3 and the main body 1 3 2 with the outer cylinder 1 2 4 while tapping the large diameter hole. Fit the inner cylindrical part 1 26 to the part 1 30. Then, the valve seat member 105 and the bottom portion 1 2 2 of the cap member 10 ⁇ 02020/174906 24 ((171?2020/001001
- the seal member 103 is attached to the valve seat member 105, and the cap member 1
- the large-diameter hole section 130 and the inner cylinder section 126 are maintained in the fitted state, so that the plurality of discs 106 and the plurality of discs fitted in the inner cylinder section 126 are
- the valve seat member 105 prevents the disc 107 from coming off from the inner cylindrical portion 126. Therefore, the plurality of discs 10 6 and the plurality of discs 10 7 are maintained in the state of being fitted to the inner tubular portion 1 26, so that they are positioned in the radial direction with respect to the cap member 1 08.
- the radial displacement is maintained in a regulated state.
- the cap member 108, the plurality of discs 107, the plurality of discs 106, the valve seat member 105 and the seal member 103 are integrated into the sub-assembly 2 It becomes 0 0.
- the valve seat member 105 can be sub-assembled to the cap member 108 by the seal member 103 provided on the outer circumference.
- the mounting shaft 28 is placed in the upper position in the vertical direction. While inserting the mounting shaft parts 28 of the piston rod 21 into the shaft step part 29, the annular member 6 7, the disk 6 6, and the disk 6 5 ⁇ 02020/174906 25 ((171?2020/001001
- a plurality of discs 64, a plurality of discs 63, a disc 62 and a piston 18 are sequentially stacked.
- the piston 18 is oriented such that the small diameter hole portion 45 is located closer to the shaft step portion 29 side than the large diameter hole portion 46.
- the pistons 18 are provided with discs 82, plural discs 8 3, plural discs 8 4 and plural discs 10 1 , And the disk 102 are sequentially stacked.
- the sub-assembly 200 described above is oriented so that the opening enlarged diameter portion 125 of the cap member 108 faces the piston 18 side.
- the valve seat member 105 is overlaid on the disc 102.
- the inner cylinder portion 126 of the cap member 108 is fitted to the mounting shaft portion 28.
- the disc 1 10 and the annular member 1 1 1 are sequentially stacked on the bottom portion 1 2 2 of the cap member 1 08 while fitting the mounting shaft portions 2 8 to each other.
- the nut 1 1 2 is screwed onto the male screw 3 1 of the piston rod 2 1 that protrudes beyond the annular member 1 1 1, and the nut 1 1 2 and the shaft step portion 2 9 Clamp the peripheral side in the axial direction.
- the inner cylindrical portion 126 of the cap member 108 does not come into contact with the valve seat member 105 in the axial direction, and the fastening axial force from the nut 1 112 is the annular portion.
- the structure is not used for.
- the inner peripheral side is clamped by the inner side seat portion 49 and the disc 65, and the outer peripheral side abuts the valve seat portion 50 of the piston 18 over the entire circumference.
- the main valve 91 is clamped on the inner seat side 4 7 of the piston 18 and the disc 8 4 via the disc 8 2 on the inner peripheral side, and the outer peripheral side is mounted on the valve seat of the piston 18 on the outer peripheral side. Abut the part 48 over the entire circumference.
- the sub-valve 1 81 is clamped on the inner side seat portion 1 3 8 of the valve seat member 1 05 and the disc 8 4 on the inner peripheral side, and on the outer peripheral side of the valve seat member 1 05. Abut on part 1 39 over the entire circumference.
- the sub-valve 1 71 is clamped on the inner seat side 1 3 4 of the valve seat member 105 and the disc 10 7 on the inner peripheral side, and on the outer peripheral side thereof in the middle of the valve seat member 1 05. Abut the valve seat portion 1 3 5 and the outer valve seat portion 1 3 6 over the entire circumference.
- the main valve 9 1 of the first damping force generating mechanism 41 is the second reducing force among the first damping force generating mechanism 41 and the second damping force generating mechanism 183 on the extension side. It has higher rigidity and higher valve opening pressure than the sub-valve 181 of the damping mechanism 183. Therefore, in the extension stroke, the second damping force generating mechanism 1 8 3 opens with the first damping force generating mechanism 4 1 closed in a very low speed region where the piston speed is lower than the predetermined value. Further, in the normal speed range in which the piston speed is higher than this predetermined value, both the first damping force generating mechanism 41 and the second damping force generating mechanism 183 open.
- the sub-valve 181 is a very low speed valve that opens in a region where the piston speed is extremely low to generate damping force.
- the second damping force generating mechanism 1 8 3 opens with the first damping force generating mechanism 41 closed.
- the sub-valve 181 is separated from the valve seat portion 139, and the upper chamber 19 and the lower chamber 20 are communicated with each other through the second passage 182 on the extension side. Therefore, the oil liquid in the upper chamber 19 flows through the passage in the passage hole 37 of the Viston 18 and the orifice 1 75, the passage in the large diameter hole 4 6 of the piston 18 and the piston rod 21. Passage in the notch 30, the passage in the small hole 1 29 of the cap member 108, the passage between the orifice 1 7 6 and the sub valve 1 81 and the valve seat 1 3 9 Through and to the lower chamber 20.
- the damping force of the valve characteristic (the characteristic that the damping force is almost proportional to the piston velocity) can be obtained even in the extremely low speed region where the piston velocity is the second predetermined value or less.
- the sub-valve 1 81 is separated from the valve seat portion 1 39, and the oil liquid flows from the upper chamber 19 to the lower chamber 20 in the second passage 18 2 on the extension side.
- the flow of the oil liquid is throttled by the orifices 1 7 5 and 1 7 6 provided on the downstream side of the main valve 9 1, so that the pressure applied to the main valve 9 1 becomes high.
- the differential pressure increases, the main valve 91 separates from the valve seat portion 48, and oil liquid flows from the upper chamber 19 to the lower chamber 20 in the first passage 9 2 on the extension side.
- the oil liquid in the upper chamber 19 flows into the lower chamber 20 through the passage in the passage hole 37 and the passage between the main valve 91 and the valve seat portion 48.
- the damping force of the valve characteristic (the damping force is almost proportional to the Biston velocity) can be obtained even in the normal velocity region where the piston velocity is higher than the second predetermined value.
- the differential pressure between the upper chamber 19 and the lower chamber 20 is not less than the first predetermined value and not more than the second predetermined value.
- the main valve 9 1 opens to allow the oil liquid to flow through the first passage 9 2 ⁇ 02020/174906 28 ⁇ (: 171?2020/001001
- the shock absorber 1 is a first passage which is a flow path for flowing the oil liquid from the upper chamber 19 to the lower chamber 20 in the extension stroke.
- the 1st passage 9 2 and the 2nd passage 1 82 are provided in parallel, and the main valve 9 1 and the sub valve 1 8 1 are provided in parallel. Also, the orifices 175 and 176 are connected in series with the sub valve 181.
- the main valve 9 1 opens to allow the oil liquid to flow through the first passage 9 2 to a large extent. It can flow at a flow rate.
- the flow rate flowing through the second passage 1 82 between the sub valve 1 81 and the valve seat portion 1 39 is reduced. Therefore, the valve rigidity of the sub valve 181 can be reduced. Therefore, for example, the rate of increase of the damping force with respect to the increase of the piston speed in the normal speed region of the piston speed can be reduced.
- the slope of the increasing rate of the damping force on the extension side with respect to the increase of the Viston speed in the normal speed region can be made to lie more than in the extremely low speed region. As a result, the degree of freedom in design can be expanded.
- the main valve 7 1 of the first damping force generation mechanism 4 2 ⁇ 02020/174906 29 ⁇ (: 171?2020/001001
- the rigidity is higher and the valve opening pressure is higher than the sub-valve 171 of mechanism 173. Therefore, in the contraction stroke, in a very low speed region where the piston speed is lower than the specified value, the first damping force generation mechanism 42 is closed and the second damping force generation mechanism 17 3 is opened, and the piston speed In the normal speed range in which is greater than this predetermined value, both the first damping force generating mechanism 42 and the second damping force generating mechanism 1773 open.
- the sub valve 171 is a very low speed valve that opens in a region where the piston speed is extremely low to generate damping force.
- the sub-valve 1 71 is separated from the outer valve seat portion 1 36, and the lower chamber 20 and the upper chamber 19 are communicated with each other through the second passage 1 72 on the contraction side. Therefore, the oil liquid in the lower chamber 20 will pass through the passage in the outer passage hole 1 4 3 and the passage between the sub valve 1 7 1 and the outer valve seat portion 1 3 6 as well as the cap chamber 1 4 6 and the sub valve 1 7 3.
- the piston speed is greater than the fourth predetermined value. ⁇ 02020/174906 30 30 (: 171?2020/001001
- the first damping force generating mechanism 42 is opened while the second damping force generating mechanism 1773 remains open. That is, the sub-valve 1 71 is separated from the outer valve seal portion 1 36, and the oil liquid flows from the lower chamber 20 to the upper chamber 19 in the second passage 1 72 on the contraction side. At this time, since the flow rate of the oil liquid is throttled by the orifices 1 7 6 and 1 7 5 in the second passage 1 7 2, the differential pressure generated in the main valve 7 1 becomes large, and the main valve 7 1 becomes the valve seat. Separated from the part 50, the oil liquid flows from the lower chamber 20 to the upper chamber 19 through the first passage 72 on the contraction side.
- the oil liquid in the lower chamber 20 flows through the passage in the passage hole 39 and the passage between the main valve 71 and the valve seat portion 50.
- the damping force having the valve characteristic (the damping force is almost proportional to the piston velocity) can be obtained even in the normal velocity region where the piston velocity is higher than the fourth predetermined value.
- the rate of increase of the damping force on the contraction side with respect to the increase of the piston speed in the normal velocity region is lower than the rate of increase of the damping force on the contraction side with respect to the increase in the Biston velocity in the extremely low speed region.
- the slope of the increasing rate of the damping force on the contraction side with respect to the increase of the Biston velocity in the normal velocity region can be made to lie more than in the extremely low velocity region.
- the oil liquid can flow at a large flow rate through the first passage 72, so that the deformation of the sub-valve 1 71 can be suppressed.
- the pressure in the opposite direction is applied to the closed sub valve 1 81 from the lower chamber 20 and the cap chamber 1 46, but the lower chamber 20 and the upper chamber 1 9 Although there is a large differential pressure between the lower chamber 20 and the cap chamber 1 46, they communicate with each other by opening the sub valve 1 7 1, and the upper chamber and the cap chamber 1 4 6 on the downstream side of the sub valve 1 8 1. Since the orifices 1 7 6 and 1 7 5 are provided between the chamber 19 and the chamber 19, it is possible to prevent the pressure in the cap chamber 1 4 6 from dropping too low, and to adjust the cap as the pressure in the lower chamber 20 increases. The pressure in chamber 1 46 can also be increased. Therefore, the differential pressure generated between the upstream side and the downstream side of the sub valve 181 is small, and a large back pressure from the lower chamber 20 side to the cap chamber 146 side is suppressed from being applied to the sub valve 181. it can.
- the shock absorber 1 described above is provided with the first passage 7 2 and the second passage 1 7 2 in parallel as a flow passage for the oil liquid from the lower chamber 20 to the upper chamber 19 in the contraction process.
- Main valve 7 1 and sub valve 1 7 1 are provided in parallel.
- the orifices 176, 175 are connected in series with the sub valve 171 in the second passage 172.
- the differential pressure between the upper chamber 19 and the lower chamber 20 becomes larger in the normal velocity region where the piston velocity is higher than the second predetermined value, than in the extremely low velocity region below the second predetermined value.
- the orifices 1 7 6 and 1 7 5 formed on the upstream side of the sub-valve 1 7 1 can suppress the pressure rise in the cap chamber 1 4 6 and thus suppress the deformation of the sub-valve 1 7 1 due to the back pressure. can do.
- the differential pressure between the lower chamber 20 and the upper chamber 19 becomes larger than in the extremely low speed region below the fourth predetermined value.
- the deformation of the valve 1 71 can be suppressed. Therefore, the durability of the sub valve 1 71 can be improved.
- the differential pressure between the upper chamber 19 and the lower chamber 20 is larger in the normal speed region where the piston speed is higher than the second predetermined value, and in the extremely low speed region below the second predetermined value.
- the differential pressure between the lower chamber 20 and the upper chamber 19 becomes large in the normal velocity region where the piston speed is higher than the fourth set value, but when the sub valve 1 7 1 is opened, the lower chamber 2 0 communicates with the cap chamber 1 46, and the cap chamber 1 4 6 is provided with the orifices 1 7 6 and 1 7 5 provided between the cap chamber 1 4 6 and the upper chamber 19 to prevent the oil liquid from flowing into the upper chamber 1 9.
- the flow is restricted. Therefore, the pressure difference between the lower chamber 20 and the cap chamber 146 is small, and the deformation of the sub-valve 181 due to the back pressure can be suppressed. Therefore, the durability of the sub valve 181 can be improved.
- Patent Documents 1 to 3 described above have two valves that open in the same stroke, the number of parts increases. Then, productivity will decrease.
- the shock absorber 1 of the first embodiment includes the first passage on the extension side formed in the piston 18
- a first damping force generating mechanism 41 for generating damping force, and an annular valve seat member 10 5 arranged in the lower chamber 20 are provided in parallel with the first passage 9 2.
- a second damping force generating mechanism 183 which is provided in the second passage 18 2 on the extension side and generates a damping force.
- a first damping force generating mechanism 42 that is provided in the first passage 7 2 on the contraction side formed in the piston 18 and that generates a damping force
- an annular valve seat member 1 that is arranged in the lower chamber 20
- a second damping force generating mechanism 1773 that is provided in the second passage 1 72 on the contraction side in parallel with the first passage 7 2 and that generates a damping force.
- 1 7 3 and 1 8 3 are a sub valve 1 8 1 provided on the negative side of the second passages 1 7 2 and 1 8 2 formed in the valve seat member 1 0 5 and a sub valve 1 7 1 provided on the other side.
- a bottomed cylindrical cap member 108 having an outer cylindrical portion 1 2 4 and a bottom portion 1 2 2, and a piston rod on the inner peripheral side of the bottom portion 1 2 2 of the cap member 1 08.
- An inner cylindrical portion 1 26 that can be inserted with 2 1 is formed to accommodate the sub valve 1 7 1 which is a part of the second damping force generating mechanism 1 7 3.
- the sub-valve 1 7 1 can be stored in the cap member 108 in advance and the viston rod 2 1 can be kneaded into the inner cylindrical portion 1 26, so that the productivity can be improved. It will be possible. Therefore, the cost can be reduced.
- automatic assembly since automatic assembly is possible, it is possible to further improve productivity by using automatic assembly, and it is possible to reduce costs and reduce the defective product rate.
- the sub-valve 1 71 can be radially positioned, that is, centered, with respect to the cap member 108 by the inner tubular portion 1 26 of the cap member 108, the sub-assembled state However, the sub-valve 1 7 1 does not shift. As a result, automatic assembly becomes easier and productivity can be further improved.
- the cap member 108 has a structure in which the sub-valve 1 71 and the valve seat member 105 are housed, and the valve seat member 105 is a seal member 10 provided on the outer periphery. Since the cap member 108 is sub-assembled by 3, it is possible to improve the productivity of the sub-assembly as compared with the case of performing press fitting, caulking or the like.
- cap member 108 is formed by press molding, it is possible to improve the productivity of the cap member 108.
- Patent Document 3 In Patent Document 3 described above, two oil chambers are connected in parallel flow paths, and valves are provided in these flow paths, respectively, so that valves that open in the same stroke are arranged in parallel. Have been described. By adopting a structure in which valves that open in the same stroke are arranged in parallel in this way, one valve has a better piston than the other valve. ⁇ 02020/174906 34 ⁇ (: 171?2020/001001
- the valve can be opened in the low speed region, and both valves can be opened in the higher speed region. In such a structure, it is required to improve the durability of the valve especially on the low speed side.
- the shock absorber 1 of the first embodiment has the first damping force generation mechanism 41, 4
- valve seat member 10 5 arranged in the lower chamber 20.
- a cylindrical cap member 108 with a bottom is provided between the piston 18 and the valve seat member 105 in the second passages 17 2 and 1 82, and the valve seat member 10 5 is provided inside thereof. It is arranged and provided.
- the sub-valve 1 81 is installed on the lower chamber 20 side, and the sub-valve 1 71 is installed in the cap chamber 1 4 6 between the bottom portion 1 2 2 of the cap member 10 8 and the valve seat member 1 05. .. Then, the orifices 1 7 5 and 1 7 6 are arranged on the upstream side of the flow in the extension stroke in which the sub valve 1 8 1 of the second passage 1 8 2 opens. As a result, during the contraction process, the sub-valve 1 7 1 is opened from the lower chamber 20 to flow into the cap chamber 1 4 6 and the flow of the oil liquid flowing to the upper chamber 19 is throttled by the orifices 1 7 5 and 1 7 6. become .
- the pressure difference between the cap chamber 1 46 and the lower chamber 20 becomes small, and the closed sub-valve 1 8 1, which receives back pressure from the lower chamber 20, moves from the cap chamber 1 4 6 to the lower chamber 20.
- the back pressure (differential pressure) that is received is suppressed. Therefore, the durability of the sub valve 181 can be improved.
- the piston rod 18, the cap member 108 and the valve seat member 105 are kneaded with the piston rod 21, the piston rod 18, the cap member 108 and the valve seat member are closed.
- the member 105 can be compactly arranged.
- the orifice 175 is the piston of the first damping force generation mechanism 41 on the extension side.
- the orifice 175 can be easily formed.
- the orifice 1 7 6 is formed by cutting out the disk 10 2 that abuts the valve seat member 10 5 of the second damping force generating mechanism 1 8 3 on the extension side. ⁇ 02020/174906 35 ⁇ (: 171?2020/001001
- the fists 1 7 6 can be easily formed.
- the second passages 1 7 2 and 1 8 2 are formed by notching the piston rod 2 1, and therefore the second passages 1 7 2 and 1 8 2 can be easily formed. You can
- the sub-valve 1 71 which is an inflow valve into the cap chamber 1 4 6, has a lower valve opening pressure than the sub-valve 1 81, so the sub-valve 1 7 1 is opened from the lower chamber 2 0 during the compression stroke. Oil liquid easily flows into the cap chamber 1 46. Therefore, when the pressure in the lower chamber 20 is lower, the closed sub-valve 1 8 1 receives the same pressure from the cap chamber 1 4 6 as the lower chamber 20 and the back pressure received is suppressed. Will be done. Therefore, the durability of the sub valve 181 can be further improved.
- the sub-assembly 200 and the sub-valve 181 may be attached in the axial direction in the opposite direction to the above.
- the bottom portion 1 2 2 of the cap member 10 8 of the sub-assembly 200 is brought into contact with the disc 84, and the sub-valve 1 is provided on the side opposite to the disc 8 4 of the sub-assembly 200.
- 8 1 is arranged, and a plurality of discs similar to the disc 8 4 are provided between the sub valve 1 8 1 and the disc 1 10 to secure the deformation margin of the sub valve 1 8 1.
- the passage in the passage cutout 30 of the piston rod 21 is communicated with the passage in the through hole 1 31.
- the axial length of the outer cylindrical portion 1 2 4 and the inner cylindrical portion 1 26 of 108 is longer than that in the first embodiment.
- a washer 2 11 and a disc 2 12 are provided between the bottom portion 1 2 2 of the cap member 108 and the disc 10 7.
- the washer 2 1 1 and the disc 2 1 1 2 are made of metal, and both have a circular plate shape with a hole into which the inner cylindrical portion 1 2 6 of the cap member 1 08 can be fitted.
- the washer 2 11 and the disc 2 12 are fitted in the inner tubular portion 1 26, and thereby are positioned in the radial direction with respect to the inner tubular portion 1 2 6.
- the disc 2 12 is a circular flat plate having a certain thickness and has an outer diameter larger than the outer diameter of the disc 10 7 and smaller than the outer diameter of the disc 10 6. ing.
- the washer 2 1 1 has a chamfer 2 2 1 formed along the entire circumference on the inner peripheral edge on one side in the axial direction, and a chamfer 2 2 2 also formed on the outer peripheral edge on the same side in the axial direction on the entire circumference. ing.
- the chamfers 2 2 1 and 2 2 2 are formed such that the cross section of the washer 2 1 1 including the central axis is linear.
- the washer 2 2 2 2 may be formed such that the cross section of the washer 2 1 1 including the central axis is arcuate.
- the washer 2 11 is in the form of a circular flat plate with a certain thickness, except for the chamfers 2 2 1 and 2 2 2.
- the washer 2 11 comes into contact with the bottom portion 1 2 2 of the cap member 108 on the side where the chamfers 2 2 1 and 2 2 2 in the axial direction are formed to form chamfers 2 2 1 and 2 2 2 in the axial direction.
- the other side is touching the disc 2 12.
- the washer 211 has an outer diameter that is larger than the outer diameter of the disc 2112 and smaller than the outer diameter of the disc 106.
- a washer 211 and a disc 212 are further housed in the cap member 108.
- the axial length of the cap member 108 is equal to the thickness of the washer 2 11 and the disc 2 12, and the first execution ⁇ 02020/174906 37 ⁇ (: 171?2020/001001
- the axial length of the cap member 108 is increased so that the washer 211 and the disc 2 1 2 are placed between the bottom portion 1 2 2 of the cap member 1 08 and the disc 1 07.
- the axial length of the mounting shaft portion 28 of the piston rod 21 is longer than that in the first embodiment.
- the cap member 108, the washer 2 11 1, the disc 2 12 and the plurality of discs 10 7 and the sub-valve 1 7 1 are assembled.
- the plurality of discs 106, the valve seat member 105, and the seal member 103, which compose the disk, are preassembled to form a subassembly 208.
- valve seat member with the seal member 103 mounted in the seal groove 145 [0142] Then, the valve seat member with the seal member 103 mounted in the seal groove 145.
- 10 5 is the direction in which the inner seat portion 1 3 4, the intermediate valve seat portion 1 3 5 and the outer valve seat portion 1 3 6 face toward the disc 1 0 6 side, and the outer peripheral portion of the main body portion 1 3 2 and the sealing member. Fit the outer peripheral part of 1 0 3 into the outer cylindrical part 1 2 4 of the cap member 10 8 and guide the main part 1 3 2 with the outer cylindrical part 1 2 4 while the large diameter hole 1 3 0 is inside. Fit it into the tube 1 2 6. Then, the valve seat member 105 and the bottom portion 1 2 2 of the cap member 10 8 are attached to the plurality of discs 10 6, the plurality of discs 10 7, the discs 2 1 2 and the washers 2 11 1. It will be in the state of sandwiching. In other words, a washer 2 11 is provided in the cap member 108 between the bottom portion 12 2 and the sub-valve 1 7 1 formed of the disc 1 06. ⁇ 02020/174906 38 ⁇ (: 171?2020/001001
- the seal member 103 is attached to the valve seat member 105, and the cap member 1
- valve 08 When it is inserted into the outer tubular portion 1 2 4 of the valve 08, a frictional force is generated between both the valve seat member 10 5 and the outer tubular portion 1 2 4 as in the first embodiment, and the valve The relative axial movement of the seat member 105 and the cap member 108 is restricted. As a result, the large-diameter hole section 1300 and the inner cylinder section 126 are kept in the fitted state, so that the multiple discs 1 0 6 and multiple discs fitted in the inner cylinder section 1 26 are The valve seat member 105 prevents the disc 107, the disc 211, and the washer 211 from coming off the inner tubular portion 126.
- the plurality of discs 106, the plurality of discs 107, the discs 2 12 and the washers 2 11 are kept fitted to the inner tubular portion 1 26, and therefore the cap member 1 It is positioned in the radial direction with respect to 08, and is maintained in a state in which displacement in the radial direction is restricted.
- the mounting shaft portion 28 is positioned at the upper portion in the vertical direction. While fitting the mounting shafts 28 of the piston rods 21 that have been mounted on the shaft step 29, the annular member 67, the disk 6 6, the disk 6 5, and the multiple disks 6 4 are attached to the shaft step 29. , Multiple discs 63, discs 62, pistons 18, discs 82, multiple discs 8 3, multiple discs 8 4, multiple discs 10 1 and discs 1 0 2 and so on are stacked in order.
- the sub-assembly 208 described above is oriented so that the expanded diameter portion 125 of the cap member 108 faces the piston 18 side. Then, the disc seat 105 is overlapped with the disc 10 2. At this time, the inner cylindrical portion 1 26 of the cap member 108 is fitted to the mounting shaft portion 28.
- the disc 1 10 and the annular member 1 1 1 are sequentially stacked on the bottom portion 1 2 2 of the cap member 1 08 while fitting the mounting shaft portions 2 8 to each other.
- ⁇ 02020/174906 39 ⁇ (: 171?2020/001001
- the washer 2 11 having the chamfer 2 2 1 formed on the inner peripheral side has the bottom 1 of the cap member 1 0 8 on the chamfer 2 2 1 side. Since it comes into contact with 2 2, even if the bending accuracy of the boundary portion between the bottom portion 1 2 2 and the inner tubular portion 1 26 is low, this portion can be avoided by chamfering 2 2 1. As a result, even if the bending accuracy at the boundary between the bottom portion 1 2 2 of the cap member 108 and the inner tubular portion 1 26 is low, the axial lift of the parts placed on the bottom portion 1 2 2 is suppressed. can do.
- the fastening axial force by the nut 1 12 can be generated sufficiently and stably. Therefore, it is possible to suppress the instability of the damping force of the first damping force generating mechanisms 41, 42 and the second damping force generating mechanisms 173, 183. In other words, the processing accuracy of the cap member 108 can be loosened, and the productivity of the cap member 108 can be improved.
- a valve seat member 105 different from the valve seat member 105 is partially provided. Is provided.
- the valve seat member 105 is not formed with the seal groove 1445 of the first embodiment, and has a larger outer diameter than the main body 132 of the first embodiment. It has two sets.
- the outer diameter of the main body portion 1 3 2 is the outer diameter that is fitted into the outer tubular portion 1 2 4 of the cap member 108 by press fitting with a tightening margin.
- a chamfer 2 25 is formed over the entire circumference on the outer peripheral edge of the valve seat member 1 0 5 on the side of the outer valve seat 1 3 6 in the axial direction.
- a plurality of discs 10 6 and a plurality of discs are included.
- valve seat member 10 7 and valve seat member 10 5 are housed.
- the cap member 108 and the valve seat member 1055 form a housing 1447.
- a cap member 108 When assembling the shock absorber 1 of the third embodiment, a cap member 108, a plurality of discs 107, a plurality of discs 106 constituting the sub-valve 1 71, and a valve
- the seat member 105 and the seat member 105 are pre-assembled to form a sub-assembly 2050.
- valve seat member 105 is attached to the inner seat portion 134 and the intermediate valve seat portion.
- the opening enlarged diameter portion 1 2 5 of the cap member 1 08 is The chamfers 2 25 of the main body 1 3 2 and the guides guide them so that they are positioned in the radial direction.
- the valve seat member 105 is fitted into the outer cylindrical portion 1 2 4 by press fitting so that the outer cylindrical portion 1 2 4 is sealed. In this state, in the cap member 108, the sub-valve 171 and the valve seat member 1050 made up of the disc 1106 are housed.
- valve seat member 105 and the cap member 108 are relatively movable in the axial direction. And relative radial movement is restricted and fixed. At this time as well, the large-diameter hole section 130 and the inner cylindrical section 126 are maintained in the fitted state, so that the multiple discs 106 and the multiple discs fitted in the inner cylindrical section 126 are The valve seat member 105 restricts the disc 107 from coming off from the inner cylindrical portion 126. Therefore, the plurality of discs 10 6 and the plurality of discs 10 7 are maintained in the state of being fitted to the inner tubular portion 1 26, and thus are positioned in the radial direction with respect to the cap member 10 8. The displacement in the radial direction is maintained in a regulated state. In this way, the cap member 108, the plurality of discs 107, the plurality of discs 106 and the valve seat member 105 are integrated sub-assemblies 200.
- the mounting shaft portion 28 is positioned at the upper part in the vertical direction. While fitting the mounting shafts 28 of the piston rods 21 that have been mounted on the shaft step 29, the annular member 67, the disk 6 6, the disk 6 5, and the multiple disks 6 4 are attached to the shaft step 29. , Multiple discs 63, discs 62, pistons 18, discs 82, multiple discs 8 3, multiple discs 8 4, multiple discs 10 1 and discs 1 0 2 and so on ⁇ 02020/174906 42 ((171?2020/001001
- the sub-assembly 20 0 described above is oriented so that the expanded diameter portion 1 2 5 of the cap member 10 8 faces the piston 18 side.
- the valve seat member 105 is overlaid on the disk 10 2.
- the inner cylinder portion 126 of the cap member 108 is fitted into the mounting shaft portion 28.
- the disc 1 10 and the annular member 1 1 1 are sequentially stacked on the bottom portion 1 2 2 of the cap member 1 0 8 while fitting the mounting shaft portions 2 8 to each other.
- the nut 1 1 2 is screwed onto the male screw 3 1 of the piston rod 2 1 that protrudes beyond the annular member 1 1 1, and the nut 1 1 2 and the shaft step portion 2 9 Clamp the peripheral side in the axial direction.
- the valve seat member 105 since the valve seat member 105 is press-fitted into the cap member 108 at the outer periphery, the seal member between them should be eliminated. You can Therefore, the number of parts can be reduced. Further, since the valve seat member 105 is press-fitted into the cap member 108 to form the sub-assembly 20 00, the sub-assembly state of the sub-assembly 20 06 can be firmly maintained.
- a washer 211 and a disc 212 similar to those in the second embodiment are provided between the bottom portion 1 2 2 of the cap member 108 and the disc 1 07. Good structure.
- valve seat member 105 of the first embodiment is replaced by a valve seat member 105 ( 3 provided ⁇ 02020/174906 43 ⁇ (: 171?2020/001001
- the valve seat member 1 0 5 ( 3 does not have the seal groove 1 45 of the first embodiment, and has a larger outer diameter than the main body 1 3 2 of the first embodiment.
- the valve seat member 105 ( 3 has an outer diameter that fits into the outer cylindrical portion 1 24 of the cap member 108 with almost no gap.
- a chamfer 2300 is formed over the entire circumference on the outer peripheral edge portion of the valve seat member 105 on the side of the outer valve seat portion 136 in the axial direction.
- a cap member 108 0 which is partially different from the cap member 108 of the first embodiment is provided.
- the cap member 108 ( 3 is replaced with the opening expanding part 1 25 of the first embodiment, and extends radially inward from the side opposite to the axial bottom part 1 22 of the outer tubular part 1 24.
- An annular locking portion 2 3 1 is formed so as to project.
- the cap member 108 ( 3 contains a plurality of discs 106, a plurality of discs 107 and a valve seat member 105 ⁇ 3.
- the cap member 10 80 and the valve seat member 105 constitute the housing 140.
- the seat member 1500 is preassembled to form a subassembly 200000.
- the cap member 1 08 ( 3) having a shape in which the outer tubular portion 1 2 4 extends to the end opposite to the bottom portion 1 2 2 before the locking portion 2 3 1 is formed.
- the cap member 108 ( 3 placed so that the bottom portion 1 22 2 is located at the lower portion in the vertical direction), fit multiple discs 1 07 into its inner tubular portion 1 2 6.
- the discs 10 7 Place 6 on disk 107.
- valve seat member 1 05 0 is attached to the inner seat portion 1 3 4 and the intermediate valve seat portion.
- the main body 1 3 2 ( 3 is guided by the outer tubular part 1 2 4 while the large diameter hole 1 3 0 is fitted to the inner tubular part 1 26. After that, the outer tubular part 1 2 2 The end portion on the side opposite to the bottom portion 1 2 2 of 4 is plastically deformed by crimping radially inward over the entire circumference to form the engagement portion 2 3 1. Then, the engagement portion 2 3 1 and the bottom portion 1 2 2 holds the valve seat member 105 ( 3, the plurality of discs 10 6 and the plurality of discs 10 7).
- the main body portion 1 3 2 ( 3 chamfer 2 3 0 Guide the main body part 1320 so as to position it in the radial direction. Also, since the locking part 2 31 is formed by caulking, the valve seat member 1 0 5 ( 3 and the locking part 2 It is hermetically sealed over the entire circumference with 31. In this state, the sub-valve 1 71 and the valve seat member 105 ( 3 are housed in the cap member 105.
- valve seat member 1 05 3 is fitted to the outer tubular portion 1 2 4 and locked to the locking portion 2 3 1, so that the valve seat member 1 05 0 and the cap member 1 1 0 8 ⁇ is fixed by restricting the relative axial movement and relative radial movement.At this time as well, the large diameter hole 1 3 0 and the inner cylindrical portion 1 2 6 are in a fitted state.
- the multiple discs 1 0 6 and the multiple discs 1 0 7 fitted in the inner tubular portion 1 26 are prevented from coming off from the inner tubular portion 1 2 6 by the valve seat member 1 0 5 Therefore, the plurality of discs 10 6 and the plurality of discs 10 7 are kept fitted in the inner tubular portion 1 26, so that the cap member 10 8 ( 3 It is positioned in the radial direction with respect to and is maintained in a state in which the displacement in the radial direction is regulated in this manner, in this manner, the cap member 1080, the plurality of disks 10 7 and the plurality of disks 10 6 And the valve seat member 1500 becomes an integrated subassembly 200.
- a plurality of discs 101 and discs 102 are sequentially stacked.
- the sub-assembly 200 0 described above is oriented so that the locking portion 2 3 1 of the cap member 100 8 faces the piston 18 side. Then, the valve seat member 105 ( 3 is overlapped with the disc 102 at 3. At this time, the inner cylindrical portion 1 26 of the cap member 108 is fitted to the mounting shaft portion 28.
- the disc 1 10 and the annular member 1 1 1 are sequentially stacked on the bottom portion 1 2 2 of the cap member 1 800 while fitting the mounting shaft portions 2 8 to each other.
- the nut 1 1 2 is screwed onto the male screw 3 1 of the piston rod 2 1 that protrudes more than the annular member 1 1 1, and the nut 1 1 2 and the shaft step portion 29 are used to Clamp the peripheral side in the axial direction.
- the cap member 108 holds the valve seat member 105 by crimping, so the seal member between them is eliminated. be able to. Therefore, the number of parts can be reduced. Further, since the cap member 10080 locks the valve seat member 1500 by crimping, the sub-assembly state of the sub-assembly 200O can be firmly maintained.
- the same washer 211 and disc 2 12 as in the second embodiment are provided between the bottom portion 1 2 2 of the cap member 1080 and the disc 10 7.
- the structure may be provided.
- a cap member 1080 different from this is provided in place of the cap member 108 of the first embodiment.
- the cap member 108 0 is composed of two parts, a first cap member 2 4 1 and a second cap member 2 4 2.
- the first cap member 2 4 1 has the same bottom 1 2 2 and outer cylinder as the first embodiment.
- the inner cylindrical portion 1 2 6 of the first embodiment is not formed.
- the first cap member 2 4 1 is fitted to the mounting shaft portion 28 at the bottom hole 1 1 2 2 and positioned in the radial direction with respect to the mounting shaft portion 28.
- the second cap member 2 4 2 is on the side opposite to the inner cylindrical portion 1 2 6 as in the first embodiment and the chamfers 1 2 7 and 1 2 8 in the axial direction of the inner cylindrical portion 1 2 6 And a flange portion 2 45 that extends radially outward from the end portion of the.
- the second cap member 2 4 2 forms the inner tubular portion 1 2 6.
- the second cap member 2 4 2 is fitted to the mounting shaft portion 28 in the inner cylindrical portion 1 26 and is positioned in the radial direction with respect to the mounting shaft portion 28.
- a plurality of discs 106, discs 107, valve seat members 105 and seal members 103 are housed in the cap member 108.
- the cap member 1 0 80, the valve seat member 1 05 and the seal member 1 0 3 form a housing 1 4 7 0.
- the discs 10 6 and 10 7 are fitted on the inner cylindrical portion 1 26 of the second cap member 2 4 2 and placed on the flange portion 2 4 5.
- the number of disks 107 is one, which is smaller than that in the first embodiment, by the thickness of the flange portion 2445 of the second cap member 24-2.
- the axial length of the cap member 1080 and the axial length of the mounting shaft portion 28 are longer than in the first embodiment because the number of disks 107 cannot be adjusted.
- the cap member 1 08 0 that is made up of two parts, the first cap member 2 4 1 and the second cap member 2 4 2, ⁇ 02020/174906 47 ⁇ (: 171?2020/001001
- the disc 107, the plurality of discs 106, the valve seat member 105, and the seal member 103 are pre-assembled to form a sub-assembly 200.
- the disc 1 0 7 may be fitted to the inner cylindrical portion 1 2 6 of the second cap member 2 4 2 in which the flange portion 2 4 5 is positioned at the lower part in the vertical direction.
- the disc 1 07 on the flange 2 4 5 and to fit the multiple discs 1 0 6 to the inner cylinder 1 2 6 to place the disc 1 0 6 on the disc 1 0 7.
- valve seat member with the seal member 103 mounted in the seal groove 1445.
- valve seat member 10 5 restricts the plurality of discs 10 6 and 10 7 fitted into the inner tubular portion 126 from coming off the inner tubular portion 1 26. Therefore, the plurality of discs 10 6 and 10 7 are maintained in the state of being fitted to the inner tubular portion 1 26, so that they are positioned in the radial direction with respect to the cap member 1 08, and Displacement is maintained in a regulated state ⁇ 02020/174906 48 ⁇ (: 17 2020/001001
- valve seat member 10 5 fitted to the outer tubular portion 1 2 4 via the seal member 10 3 is positioned in the radial direction with respect to the first cap member 2 4 1 and has a large diameter.
- the second cap member 2 4 2 is positioned in the radial direction with respect to the valve seat member 10 5 by fitting the hole portion 1 30 and the inner tubular portion 1 26 together.
- the second cap member 2 4 2 is positioned in the radial direction with respect to the first cap member 2 4 1.
- the plurality of discs 10 6 and 10 7 fitted into the inner cylindrical portion 1 26 of the second cap member 2 4 2 are positioned in the radial direction with respect to the cap member 1 0 80. Radial displacement is regulated.
- the first cap member 2 41, the second cap member 2 4 2, the disc 10 7, the plurality of discs 10 6, the valve seat member 10 5 and the seal member 10 3 are integrated into one body. This is the subassembly 200.
- the sub-assembly 200 0 described above is arranged so that the opening enlarged diameter portion 125 in the cap member 108 is oriented toward the piston 18 side. Then, the disc seat 105 is overlapped with the disc 10 2. At this time, the mounting shaft portion 28 is fitted to the inner tubular portion 1 26 of the second cap member 2 4 2 and the bottom portion 1 2 2 of the first cap member 2 4 1.
- the disc 1 10 and the annular member 1 1 1 are sequentially stacked on the bottom portion 1 2 2 of the first cap member 2 4 1 while fitting the mounting shaft portions 2 8 to each other.
- the nut 1 1 2 is screwed into the screw 3 1, and the inner peripheral side of these nuts 1 1 2 and the shaft step portion 29 is clamped in the axial direction.
- the inner tubular portion 1 2 6 of the second cap member 2 4 2 does not come into contact with the valve seat member 10 5 in the axial direction, and the fastening axial force from the nut 1 1 2 is Annular member 1 1 1, disk 1 1 0, bottom portion 1 2 2 of 1st cap member 2 4 1, flange portion 2 4 5 of 2nd cap member 2 4 2, disc 1 07, multiple discs 1 0 6, valve seat member 1 05 inner seat 1 3 4, main body 1 3 2, inner sheave 1 3 8, disc 1 0 2, multiple discs 1 0 1, multiple discs 8 4, multiple discs 8 3, disc 8 2, piston inner seat part 4 7, main body part 34, inner seat part 4 9, disc 6 2, multiple discs 6 3, multiple discs 6 4, It is transmitted to the shaft step portion 29 through the disc 65, the disc 66 and the annular member 67.
- the mouthpiece 1 of the fifth embodiment has the cap member 108
- first cap member 2 4 1 having 1 2 2 and an outer tubular portion 1 2 4 and a second cap member 2 4 2 forming an inner tubular portion 1 26. Therefore, molding by pressing becomes easy, and the incidence of defective products can be reduced. In particular, when the cap member 180 is long in the axial direction, the use of two parts facilitates molding by pressing.
- a washer 211 and a disc 2 1 2 similar to those in the second embodiment are attached to the flange portion 2 4 5 of the second cap member 2 4 2 and the disc 1 0 7. A structure may be provided between them.
- valve seat member 105 is installed in the same manner as in the third embodiment.
- the cap member 2 4 1 may have a structure in which the seal member 10 3 is abolished by being press-fitted into the outer cylindrical portion 1 2 4. Even in that case, it is possible to adopt a structure in which the washer 2 11 and the disk 2 12 are provided as in the second embodiment.
- the first cap member is used.
- a locking part is formed by caulking on the side opposite to the bottom part 1 2 0 of the outer cylindrical part 1 2 4 of 2 4 1, and the valve seat member 1 0 5 is locked by the locking part, and the sealing member 1 Structure to abolish 0 3 ⁇ 02020/174906 50 ((171?2020/001001
- the shock absorber 1 according to the sixth embodiment is a shutter type damping force adjusting type shock absorber, and the basic structure and operation thereof are the shock absorbers described in Japanese Patent Laid-Open No. 2013-204072. It is the same as the container.
- a cylinder 2 in which an oil liquid as a working fluid is enclosed, and a slidable inside of the cylinder 2 are provided. 2 has a piston 18 that divides the interior into two chambers, an upper chamber 19 and a lower chamber 20, and a piston rod 21 that is connected to the piston 18 and extends to the outside of the cylinder 2. ..
- the piston rod 21 is a main shaft component member 3 that extends outside the cylinder 2.
- a mounting shaft portion constituting member 30 2 (guide member) arranged in the cylinder 2, which are connected to each other.
- a mounting shaft portion 28 and a shaft step portion 29 are formed in the mounting shaft component member 302.
- the piston 18 has a contraction-side first part where oil liquid flows from the lower chamber 20 on the upstream side in the cylinder 2 to the upper chamber 19 on the downstream side by moving the piston 18 to the contraction side.
- a passage 72 is formed.
- a first damping force generation mechanism 41 including a compression side main valve 7 1 which is provided in the compression side first passage 7 2 and generates a damping force. ing.
- a first passage 92 on the extension side from which the oil liquid flows out is formed from an upper chamber 19 on the upstream side in 2 to a lower chamber 20 on the downstream side.
- an extension side first damping force generation mechanism 42 including a main valve 91 which is provided in the extension side first passage 92 and generates a damping force.
- the mounting shaft portion constituent member 302 provided on the piston rod 21 is generally cylindrical, and thus the mounting shaft portion 28 is also cylindrical. Mounting shaft
- the cylindrical side wall 3 10 that constitutes the axially intermediate portion of 28 has a guide boat 3 11 that penetrates it in the radial direction, and it has a shaft step portion 29 rather than the guide boat 3 11. Also has a guide boat 3 1 2 penetrating in the radial direction on the opposite side.
- a cylindrical shutter member 3 21 is rotatably fitted in the mounting shaft member 3 02.
- the shutter member 3 2 1 is connected to the rotary shaft 3 2 3 of the electric drive unit 3 2 2 (driving means) provided on the main shaft component member 3 0 1, and thus the electric drive unit 3 2 2 is connected. It is driven and rotates in the mounting shaft component member 302.
- the shutter member 3 2 1 has a cylindrical side wall 3 4 1 and a shutter port 3 4 2 facing the guide boat 3 1 1 and a shutter port 3 4 3 facing the guide boat 3 1 2. have.
- the guide port 3 1 1 and the shutter port 3 4 2 facing the guide port 3 1 1 can communicate with each other, and the communication amount changes depending on the rotational position of the shutter member 3 2 1.
- the guide boat 3 1 12 and the shutter port 3 4 3 facing the guide boat 3 1 2 can communicate with each other, and the amount of communication varies depending on the rotating position of the shutter member 3 2 1.
- Shutter ports 3 4 2 and 3 4 3 are shutter members.
- annular chamber arranged in one of the upper chamber 19 of the upper chamber 19 and the lower chamber 20.
- a valve seat member 105, a seal member 103 provided on the outer periphery of the valve seat member 105, and a cap member 108 having a cylindrical shape with a bottom are provided.
- the cap member 108 has a bottom part 1 2 2 and a bottom part 1 2 2 having a circular plate shape with a hole. ⁇ 02020/174906 52 ⁇ (: 171?2020/001001
- the taper tube part 1 2 3 that extends from the peripheral part while expanding in the axial direction _ side, and the end opposite the bottom part 1 2 2 of the taper tube part 1 2 3 and the opposite direction from the bottom part 1 2 2
- the cylindrical inner cylinder 1 that extends from the inner peripheral edge of the bottom 1 2 2 to the same side as the tapered cylinder 1 2 3 and the outer cylinder 1 2 4 2 6 and.
- the cap member 108 forms a cap chamber 1446 by fitting the valve seat member 105 and the seal member 103 inside the outer cylindrical portion 1224.
- the inner cylindrical portion 1 26 of the cap member 108 is formed with a through hole 3 5 1 penetrating in the radial direction.
- a through hole 3 52 is formed radially closer to the bottom 1 2 2 than the through hole 3 5 1.
- the through hole 3 5 1 communicates with the guide boat 3 1 1, and the through hole 3 5 2 communicates with the guide boat 3 1 2.
- the valve seat member 105 has a passage hole 361 forming the second passage 172 on the contraction side and a passage hole 362 forming the second passage 182 on the extension side. Has been formed.
- the valve seat member 105 is formed with a through hole 374 having a small diameter hole portion 371, a medium diameter hole portion 372 and a large diameter hole portion 373 at the center in the radial direction. ..
- the small diameter hole 371 is fitted with the mounting shaft 28, and the medium diameter hole 372 is fitted with the inner cylindrical portion 126 of the cap member 108. It
- the second damping including the compression side sub-valve 171 which is provided in the compression side second passage 172 and generates the damping force.
- a force generating mechanism 1 73 is provided.
- a first passage which is provided in the second passage 1 82 on the extension side and includes a sub valve 1 81 on the extension side which generates damping force.
- 2 Damping force generating mechanism 1 8 3 is provided.
- a passage forming member 3 8 1 that forms a passage that penetrates in the radial direction.
- a passage forming member 3 82 which forms a passage that penetrates in the radial direction.
- the second passage 17 2 on the contraction side is provided with the mounting shaft portion constituting member 3 02 and the shutter member. ⁇ 02020/174906 53 ⁇ (: 171?2020/001001
- the passage on the inner peripheral side of 3 2 1, the passage in the shutter port 3 4 3 of the shutter member 3 21 1, the passage in the guide boat 3 1 2 of the mounting shaft component member 3 0 2, and the cap member 1 The passage is formed in the through hole 3 52 of No. 08, the passage in the passage forming member 3 82, the cap chamber 1 46, and the passage in the passage hole 3 61.
- the movement of the piston 18 to the contraction side causes the oil liquid to flow from the lower chamber 20 on the upstream side in the cylinder 2 to the upper chamber 19 on the downstream side.
- the contraction-side second passage 1 7 2 is provided in parallel with the contraction-side first passage 7 2.
- the second damping force generating mechanism 1773 is provided in the second passage 172 to generate a damping force.
- the second passage 18 2 on the extension side is connected to the passage inside the passage hole 3 62 and the passage forming member 3 82.
- the second passage 18 2 on the extension side includes the passage of the second damping force generating mechanism 1 83 in the open state, the cap chamber 1 46, the passage in the passage forming member 3 82, and the cap member.
- the passage inside the through hole 3 52 of the 108, the passage inside the guide port 3 12 of the mounting shaft component member 3 02 and the passage inside the shutter port 3 4 3 of the shutter member 3 21 Have In the second passage 18 2 on the extension side, oil moves out from the upper chamber 19 on the upstream side in the cylinder 2 to the lower chamber 20 on the downstream side by the movement of the piston 18 to the extension side.
- the second passage 18 2 on the extension side is provided in parallel with the first passage 9 2 on the extension side.
- the second damping force generating mechanism 183 is provided in the second passage 182 to generate a damping force.
- the mounting shaft component member 302, the shutter member 321 and the electric drive unit 322 constitute a part of the second damping force generating mechanisms 173 and 183.
- the second damping force generating mechanism 1 7 3 and 1 8 3 are provided on one side of the second passages 1 7 2 and 1 8 2 formed in the valve seat member 10 5 and on the sub valve 1 7 1 and the other side. It has a sub-valve 1 8 1.
- the second damping force generating mechanism 183 has a cap member 108.
- the cap member 108 is a part of the second damping force generation mechanism 1 83.
- a sub valve 1 81, a valve seat member 1 05, and a passage forming member 3 8 2 are housed.
- the cap member 108, the passage forming member 3 82, the sub valve 1 81, the valve seat member 10 5 and the seal member 10 3 and 3 are preassembled to form a subassembly 200.
- valve seat member 105 with the seal member 103 mounted on the outer peripheral portion is fitted together with the seal member 103 into the outer cylindrical portion 1 24 of the cap member 108.
- the valve seat member 105 and the bottom portion 122 of the cap member 108 sandwich the sub valve 181 and the passage forming member 382.
- the seal member 103 is attached to the valve seat member 105, and the cap member 1
- valve seat member 1 05 restricts the sub-valve 1 8 1 and the passage forming member 3 82 fitted in the inner cylindrical portion 1 26 from coming off from the inner cylindrical portion 1 26.
- the sub-valve 181 and the passage forming member 382 are maintained in the state of being fitted to the inner cylindrical portion 1226, so that the sub-valve 181 and the passage forming member 382 are positioned in the radial direction with respect to the cap member 108, and the The positional deviation of is maintained in a regulated state.
- the cap member 108, the sub-valve 1 81, the passage forming member 3 82, the valve seat member 10 5 and the seal member 10 3 form an integral sub-assembly 2 0 0.
- the shock absorber 1 in the extension stroke, for example, the first damping force ⁇ 02020/174906 55 ⁇ (: 171?2020/001001
- the generation mechanism 42 opens and oil flows from the upper chamber 19 to the lower chamber 20 via the first passage 92.
- the passage in the passage hole 3 62 which constitutes the second passage 1 82, the passage in the passage forming member 3 81, and the large portion of the valve seat member 105.
- the passage in the radial hole portion 3 73, the passage in the through hole 3 51 of the cap member 108, the passage in the guide boat 3 1 1 of the mounting shaft component member 3 02, and the shutter member 3 2 Oil flow from the upper chamber 19 to the lower chamber 20 through the passage in the shutter port 3 42 of 1 and the passage on the inner peripheral side of the shutter member 3 21 and the mounting shaft component member 302. Is flowing.
- the communication path between the passage in the guide port 3 1 1 of the mounting shaft component member 3 02 and the passage in the shutter port 3 4 2 of the shutter member 3 2 1 is connected to the electric drive unit 3 2 2 2.
- the damping force is adjusted by being changed by driving the.
- the amount of communication between the passage in the guide port 3 1 2 of the mounting shaft component member 3 02 and the passage in the shutter port 3 4 3 of the shutter member 3 2 1 is equal to that of the electric drive unit 3 2 2.
- the damping force is adjusted by being changed by driving.
- the first damping force generating mechanism 41 opens and the oil liquid flows from the lower chamber 20 to the upper chamber 19 via the first passage 72.
- the passage on the inner peripheral side of the mounting shaft portion constituting member 30 2 and the shutter member 3 21 and the shutter of the shutter member 3 2 1 that constitutes the second passage 1 72 A passage in the port 3 43, a passage in the guide shaft 3 1 2 of the mounting shaft member 3 02, a passage in the through hole 3 52 of the cap member 108, and a passage formation Passage in member 3 82, cap chamber 1 4 6 and passage in passage hole 3 6 1 ⁇ 02020/174906 56 ⁇ (: 171?2020/001001
- the oil liquid flows from the lower chamber 20 to the upper chamber 19 via the passage of the second damping force generating mechanism 1773 that opens.
- the amount of communication between the passage in the guide boat 3 12 of the mounting shaft component member 3 02 and the passage in the shutter port 3 4 3 of the shutter member 3 2 1 is determined by the electric drive unit 3 2 2.
- the damping force is adjusted by being changed by driving.
- the subassembly 2100 and the subvalve 171 are axially arranged while ensuring the deformation allowance of the subvalve 171. In, it is possible to attach it in the opposite direction to the above.
- the present invention is not limited to this, and the outer cylinder is eliminated and the lower chamber 20 in the cylinder 2 is omitted. It may be used for a mono-tube type hydraulic shock absorber that forms a gas chamber with a partition that can slide on the side opposite to the upper chamber 19 and the pressure using a packing valve with a structure in which a disc is equipped with a seal member. It can be used in any shock absorber, including control valves.
- a first aspect of the above-described embodiment is: a cylinder in which a working fluid is sealed; a piston slidably provided in the cylinder and dividing the cylinder into two chambers; A piston rod that is connected to the bistone and extends to the outside of the cylinder; A second damping passage, a first damping force generating mechanism that is provided in the first passage formed in the piston and that generates a damping force, and an annular valve seat member that is disposed in one of the chambers, A second damping force generating mechanism that is provided in the second passage in parallel with the first passage and that generates a damping force; and the second damping force generating mechanism is formed in the valve seat member.
- the second sub-valve and the valve seat member are housed in the cap member, and the valve seat member includes a seal member provided on an outer periphery thereof. It can be sub-assembled to the cap member.
- the second sub-valve and the valve seat member are housed in the cap member, and the outer periphery of the valve seat member is press-fitted into the cap member. Has been done.
- a washer is provided between the bottom portion in the cap member and the second sub valve.
- the cap member forms a first cap member having the outer tubular portion and the bottom portion, and the inner tubular portion. It consists of a second cap member.
- the cap member is formed by press molding.
- the first damping force generating mechanism in the region where the piston speed is low, the first damping force generating mechanism is closed and the second damping force generating mechanism is Both the first damping force generation mechanism and the second damping force generation mechanism open when the piston speed is higher than the low speed.
- the valve seat member is provided in the cap member, and the first sub valve is one In the chamber, the second sub-valve is provided in the cap chamber between the bottom portion of the cap member and the valve seat member, and in the second passage, upstream of the flow in which the first sub-valve opens or An orifice is located on the downstream side.
- the second damping force generating mechanism is a cylindrical guide member provided in the piston rod and having a guide boat on a side wall.
- a shutter member rotatably fitted in the guide member, the shutter member having a shutter port on a side wall facing the guide port, and the shutter member.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021501690A JP7055236B2 (ja) | 2019-02-26 | 2020-01-15 | 緩衝器 |
US17/432,249 US20220186807A1 (en) | 2019-02-26 | 2020-01-15 | Shock absorber |
DE112020000941.6T DE112020000941T5 (de) | 2019-02-26 | 2020-01-15 | Stossdämpfer |
CN202080015245.5A CN113454360A (zh) | 2019-02-26 | 2020-01-15 | 缓冲器 |
KR1020217020357A KR102582860B1 (ko) | 2019-02-26 | 2020-01-15 | 완충기 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2019032704 | 2019-02-26 | ||
JP2019-032704 | 2019-02-26 |
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WO2020174906A1 true WO2020174906A1 (ja) | 2020-09-03 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2020/001001 WO2020174906A1 (ja) | 2019-02-26 | 2020-01-15 | 緩衝器 |
Country Status (6)
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US (1) | US20220186807A1 (ja) |
JP (1) | JP7055236B2 (ja) |
KR (1) | KR102582860B1 (ja) |
CN (1) | CN113454360A (ja) |
DE (1) | DE112020000941T5 (ja) |
WO (1) | WO2020174906A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5830539A (ja) * | 1981-08-18 | 1983-02-23 | Tokico Ltd | 油圧緩衝器用バルブガイドの製造方法 |
JP2009287763A (ja) * | 2008-06-02 | 2009-12-10 | Kayaba Ind Co Ltd | ロータリバルブ |
WO2018062151A1 (ja) * | 2016-09-27 | 2018-04-05 | 日立オートモティブシステムズ株式会社 | 緩衝器 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2250080B (en) * | 1990-10-19 | 1994-08-17 | Tokico Ltd | Hydraulic shock absorber |
US8553584B2 (en) | 2010-09-08 | 2013-10-08 | Telefonaktiebolaget L M Ericsson (Publ) | Automated traffic engineering for 802.1AQ based upon the use of link utilization as feedback into the tie breaking mechanism |
JP5897955B2 (ja) | 2012-03-29 | 2016-04-06 | 日立オートモティブシステムズ株式会社 | 減衰力調整式緩衝器 |
JP5883362B2 (ja) * | 2012-08-10 | 2016-03-15 | Kyb株式会社 | バルブおよび緩衝器 |
JP6442248B2 (ja) * | 2014-11-25 | 2018-12-19 | Kyb株式会社 | 減衰バルブ及び緩衝器 |
JP2018076920A (ja) | 2016-11-09 | 2018-05-17 | トヨタ自動車株式会社 | ショックアブソーバ |
KR20180076920A (ko) | 2016-12-28 | 2018-07-06 | 대우조선해양 주식회사 | 데릭 로드 테스트 시스템 및 방법 |
JP2019032704A (ja) | 2017-08-08 | 2019-02-28 | 株式会社日立製作所 | 表データ構造化システムおよび表データ構造化方法 |
-
2020
- 2020-01-15 WO PCT/JP2020/001001 patent/WO2020174906A1/ja active Application Filing
- 2020-01-15 KR KR1020217020357A patent/KR102582860B1/ko active IP Right Grant
- 2020-01-15 US US17/432,249 patent/US20220186807A1/en active Pending
- 2020-01-15 JP JP2021501690A patent/JP7055236B2/ja active Active
- 2020-01-15 CN CN202080015245.5A patent/CN113454360A/zh active Pending
- 2020-01-15 DE DE112020000941.6T patent/DE112020000941T5/de active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5830539A (ja) * | 1981-08-18 | 1983-02-23 | Tokico Ltd | 油圧緩衝器用バルブガイドの製造方法 |
JP2009287763A (ja) * | 2008-06-02 | 2009-12-10 | Kayaba Ind Co Ltd | ロータリバルブ |
WO2018062151A1 (ja) * | 2016-09-27 | 2018-04-05 | 日立オートモティブシステムズ株式会社 | 緩衝器 |
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JPWO2020174906A1 (ja) | 2021-12-16 |
DE112020000941T5 (de) | 2021-12-02 |
KR102582860B1 (ko) | 2023-09-25 |
KR20210094072A (ko) | 2021-07-28 |
JP7055236B2 (ja) | 2022-04-15 |
CN113454360A (zh) | 2021-09-28 |
US20220186807A1 (en) | 2022-06-16 |
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