WO2015064643A1 - 緩衝器 - Google Patents
緩衝器 Download PDFInfo
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- WO2015064643A1 WO2015064643A1 PCT/JP2014/078773 JP2014078773W WO2015064643A1 WO 2015064643 A1 WO2015064643 A1 WO 2015064643A1 JP 2014078773 W JP2014078773 W JP 2014078773W WO 2015064643 A1 WO2015064643 A1 WO 2015064643A1
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- WIPO (PCT)
- Prior art keywords
- sub
- valve
- passage
- disk
- damping force
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—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
- F16F9/3485—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 supporting elements intended to guide or limit the movement of the annular discs
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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
- F16F2238/00—Type of springs or dampers
- F16F2238/04—Damper
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—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
- F16F9/10—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
- F16F9/19—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 with a single cylinder and of single-tube type
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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
- F16F9/3485—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 supporting elements intended to guide or limit the movement of the annular discs
- F16F9/3487—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 supporting elements intended to guide or limit the movement of the annular discs with spacers or spacing rings
Definitions
- the present invention relates to a shock absorber that generates a damping force by controlling the flow of a working fluid with respect to the stroke of a piston rod.
- a shock absorber mounted on a suspension system of an automobile has a piston in which a piston rod is coupled slidably fitted in a cylinder in which a working fluid is sealed.
- the damping force is generated by controlling the flow of the working fluid generated by the sliding of the piston by a damping force generating mechanism including an orifice and a disk valve.
- the valve opening characteristics of the disc valve and the flow path area of the orifice are determined in order to set the optimum damping force characteristics from the viewpoint of the riding comfort and handling stability of the automobile.
- an optimum damping force is improved by incorporating a sub-valve that functions as a check valve into a disc valve in which a plurality of discs are stacked, thereby increasing the degree of freedom in setting damping force characteristics. I try to get the characteristics.
- the disk valve as described above is required to ensure sufficient durability by preventing excessive deflection at the time of valve opening and damage due to stress concentration.
- the present invention has been made in view of the above points, and an object thereof is to improve the durability of a sub-valve incorporated in a disc valve.
- the present invention provides a cylinder in which a working fluid is sealed, a piston slidably fitted in the cylinder, and connected to the piston so as to extend to the outside of the cylinder. And a damping force generation mechanism that generates a damping force by controlling a flow of a working fluid generated by sliding of the piston in the cylinder.
- the damping force generation mechanism includes a valve main body having a passage through which a working fluid flows, a clamp portion protruding toward an inner peripheral side with respect to an opening portion of the passage of the valve main body, a seat portion protruding toward an outer peripheral side, A main body including a plurality of stacked discs whose sides are clamped by the clamp portion and whose outer peripheral side is seated on the seat portion, closes the passage and receives the pressure of the working fluid on the passage side to bend and open to open the passage; A valve, a sub-passage having an opening in the disc seated on the seat portion, an inner peripheral side clamped by the disc and the clamp portion having a smaller diameter than the disc, and seated on the disc to pass through the sub-passage A sub-valve that includes a sub-disk that closes and bends under the pressure of the working fluid on the sub-passage side to open and opens the sub-passage.
- a restricting portion that abuts on the sub-disk and restricts its opening degree is provided, and the sub-disc is provided with a communication hole radially inward from a position that contacts the restricting portion. It is characterized by.
- the durability of the sub-valve incorporated in the disc valve can be improved.
- FIG. 3 is a longitudinal sectional view showing a state where a sub valve of the damping force generation mechanism shown in FIG. 2 is opened. It is a bottom view of the piston of the shock absorber shown in FIG. 3 is a front view of a sub disk constituting a sub valve of the damping force generation mechanism shown in FIG. 2. FIG. 3 is a front view of a passage disk constituting a sub passage of a sub valve of the damping force generation mechanism shown in FIG. 2.
- FIG. 3 is a front view of a notch disk constituting a sub passage of a sub valve of the damping force generation mechanism shown in FIG. 2.
- FIG. 3 is a cross-sectional view showing a deformation state when the sub disk is opened in the sub valve of the damping force generation mechanism shown in FIG. 2.
- FIG. 3 is a perspective view showing a stress distribution when the sub disk is opened in the sub valve of the damping force generation mechanism shown in FIG. 2.
- a shock absorber 1 is a single cylinder type hydraulic shock absorber attached to a suspension device of an automobile, and is provided in a cylinder 2 in which an oil liquid as a working fluid is sealed.
- the piston 3 is slidably fitted, and the inside of the cylinder 2 is defined by the piston 3 as two chambers, a cylinder upper chamber 2A and a cylinder lower chamber 2B.
- One end of a piston rod 4 is inserted into the piston 3 and connected by a nut 5.
- the other end of the piston rod 4 is a rod guide (not shown) attached to the end of the cylinder 2 and oil.
- a free piston (not shown) is slidably fitted to the bottom of the cylinder 2 to form a gas chamber. The compression and expansion of the high-pressure gas enclosed in the gas chamber causes expansion and contraction of the piston rod 4. Volume compensation of the cylinder 2 is performed.
- the piston 3 is provided with passages 10 and 11 for communicating between the cylinder upper and lower chambers 2A and 2B.
- One of the passages 10 has an opening 10 ⁇ / b> A on the lower end side that opens to an inner peripheral side portion of the lower end portion of the piston 3, and an upper end side opening portion 10 ⁇ / b> B opens to an outer peripheral side portion of the upper end portion of the piston 3.
- the other passage 11 has an upper end opening portion 11 ⁇ / b> A that opens to an inner peripheral portion of the upper end portion of the piston 3, and a lower end opening portion 11 ⁇ / b> B that opens to an outer peripheral side portion of the lower end portion of the piston 3. is doing.
- the piston 3 is provided with a first damping force generation mechanism 12 that generates a damping force by controlling the flow of the oil liquid in one passage 10 at the lower end portion of the piston 3 as a valve body.
- a second damping force generation mechanism 13 is provided that generates a damping force by controlling the flow of the oil liquid in the other passage 11.
- the first damping force generation mechanism 12 is opened by receiving the pressure of the oil liquid on the cylinder upper chamber 2A side of the passage 10, and the expansion side main valve 14 (a disc valve that generates a damping force according to the opening degree).
- a main valve a contraction side sub-valve 15 (sub-valve) which is incorporated in the extension-side main valve 14 and serves as a check valve that allows only the fluid flow from the cylinder lower chamber 2B side to the cylinder upper chamber 2A side. It is composed of
- the second damping force generation mechanism is opened by receiving the pressure of the oil on the cylinder lower chamber 2B side of the passage 11 and generates a damping force according to the opening degree of the contraction side main valve 16.
- an expansion side sub-valve 17 that is incorporated in the contraction side main valve 16 and serves as a check valve that allows only fluid flow from the cylinder upper chamber 2A side to the cylinder lower chamber 2B side.
- at least one of the first and second damping force generation mechanisms is provided with an orifice passage 18 that always communicates between the cylinder upper and lower chambers (in the illustrated example, the first damping force generation is performed as shown in FIG. 2). Only the mechanism 12 is provided).
- the opening 10 ⁇ / b> A on the lower end side of one passage 10 has a circular shape, and a plurality of (in the illustrated example, five at an equal interval) are provided along the inner peripheral side of the lower end portion of the piston 3. ) Is arranged.
- the opening 11B on the lower end side of the other passage 11 is an elongated rectangle, and a plurality (five at equal intervals in the illustrated example) are arranged on the outer peripheral side of the lower end portion of the piston 3 along the circumferential direction. Yes.
- Each opening 11B is disposed between the openings 10A in the circumferential direction.
- the openings 10 ⁇ / b> B and 11 ⁇ / b> A on the upper end side of the passages 10 and 11 are similarly arranged at the upper end portion of the piston 3.
- annular seat 19 protrudes on the inner peripheral side with respect to the opening 11 ⁇ / b> B of the passage 11 and on the outer peripheral side with respect to the plurality of openings 10 ⁇ / b> A of the passage 10.
- An annular clamp portion 20 protrudes from the top.
- the control part 21 of planar view substantially circular arc shape protrudes between each opening 10A arrange
- the extension side main valve 14 of the first damping force generation mechanism 12 is formed by laminating a plurality of substantially annular discs, and the inner peripheral side thereof includes a clamp portion 20 and a nut 5 with spacers 22 and It is clamped via the retainer 23 (see FIG. 1), and the outer peripheral side is seated on the seat portion 19.
- 2 and 3 show only a part of the plurality of stacked disks constituting the extension side main valve 14 on the seat portion 19 side.
- the expansion side main valve 14 receives the pressure of the oil liquid on the cylinder upper chamber 2A side of the passage 10, and when the pressure reaches the valve opening pressure, it bends and lifts from the seat portion 19 to open the valve, A damping force is generated according to the flow path. Further, it sits on the seat 19 and prevents the flow of oil from the cylinder lower chamber 2B side to the cylinder upper chamber 2A side of the passage 10.
- the contraction side sub-valve 15 incorporated in the extension side main valve 14 will be described.
- the passage disk 24 seated on the seat portion 19 has a circular shape facing the restriction portion 21 protruding from the lower end portion of the piston 3 as shown in FIG. 6.
- An arcuate passage opening 25 is formed.
- a notch (only shown in FIGS. 2 and 3 and not shown in FIG. 6) is formed on the outer peripheral portion of the passage disk 24 to form an orifice passage 18 that always communicates between the cylinder upper and lower chambers 2A and 2B. Is provided.
- the notch disk 26 superimposed on the passage disk 24 includes a plurality of arc-shaped openings facing the passage opening 25 and a straight opening extending radially outward from the opening to the outer periphery of the notch disk 26. 27 is formed.
- a flat disk 28 By superposing a flat disk 28 on the passage disk 24 and the notch disk 26, the passage opening 25 and the notch 27 communicate with each other to form a sub-passage 29 that connects the passage 10 and the cylinder lower chamber 2B. It is like that.
- the inner peripheral portion of the sub-disk 30 having a smaller diameter than the passage disk 24 is clamped between the passage disk 24 and the clamp portion 20 of the piston 3.
- the outer periphery of the sub-diss 30 is seated around the arc-shaped passage opening 25 of the passage disc 24 and functions as a check valve, and the sub-passage 29 extends from the cylinder upper chamber 2A side to the cylinder lower chamber 2B side. Block the flow of oil.
- the pressure of the oil liquid on the cylinder lower chamber 2B side of the sub-passage 29 is received and the pressure reaches the valve opening pressure, the outer peripheral side lifts from the passage disk 24 and opens to open the flow path. A damping force is generated accordingly.
- a plurality of circular communication holes 31 are arranged through the sub-disk 30 along the circumferential direction.
- the communication hole 31 is disposed between the passage opening 25 of the passage disk 24 and the restriction portion 21 and the clamp portion 20 of the piston 3.
- the contraction side main valve 16 and the extension side sub valve 17 of the second damping force generation mechanism 13 are configured in the same manner as the extension side main valve 14 and the contraction side sub valve 15 of the first damping force generation mechanism 12 described above.
- the valve opening pressure of the expansion side sub valve 17 is set lower than the valve opening pressure of the expansion side main valve 14 and the valve opening pressure of the contraction side sub valve 15 is set lower than the valve opening pressure of the contraction side main valve 16. Has been.
- the oil liquid on the cylinder lower chamber 2B side is pressurized by the sliding of the piston 3 in the cylinder 2, and flows through the passages 10 and 11 to the cylinder upper chamber 2A side.
- the oil liquid flows through the orifice passage 18 to generate a damping force of the orifice characteristic.
- the expansion / contraction side sub-valves 17 and 15 and the expansion / contraction side main valves 14 and 16 are sequentially opened to change the valve characteristics in two stages. Moreover, these valve characteristics can be adjusted on each of the expansion side and the contraction side. Thereby, the freedom degree of the setting of a damping force characteristic can be raised, and it becomes possible to obtain a suitable damping force characteristic.
- the communication hole 31 communicates the sub-passage 29 side of the sub-disc 30 with the region A on the inner peripheral side of the restricting portion 21 on the passage 10 side.
- the pressure is reduced.
- the communication hole 31 is provided, the bending rigidity in the vicinity of the portion clamped by the clamp portion 20 that becomes a fulcrum of bending when the sub disk 30 is opened is lowered.
- FIG. 8 (B) it was found that the sub-disk 30 was curved into a convex shape when the valve was opened.
- the valve When the valve is opened, it curves downward to generate a stress in the tensile direction on the lower surface of the sub-disk 30, and the contact area between the restricting portion 21 and the sub-disk 30 is reduced to be a point contact.
- the stress gradient after contact (the rate of increase of the stress with respect to the differential pressure) was increased, and it was easy to break.
- FIG. 9 shows the stress distribution when the sub disk 30 is opened.
- FIG. 9 shows the stress distribution by shading. The thinner the thickness, the greater the stress.
- the sub disk 30 is provided with a communication hole 31 to reduce the bending rigidity in the vicinity of the clamped portion. It is possible to alleviate the concentration of stress in the vicinity of the formed portion.
- FIG. 9A when the communication hole 31 is not provided, the sub disk 30 is easily damaged due to stress concentration in the vicinity of the restricting portion 21, the contact portion 21, and the clamped portion.
- the communication holes 31 in the sub disk 30 stress concentration can be reduced and the durability of the sub disk 30 can be improved.
- size, and shape of the communicating hole 31 can be changed suitably.
- the sub-disk 30 can reduce the damping force in the region where the piston speed is very low, the degree of tuning freedom can be increased.
- the concentration of stress is alleviated and the contact between the restricting portion 21 and the sub disk 30 is changed from the point contact to the surface contact, thereby reducing the sound generated when contacting the restricting portion 21 when the sub disk 30 is opened. Can do.
- only the contraction side sub-valve 15 may be provided.
- the damping force can be lowered compared to the expansion side damping force only in the region where the piston speed in the contracting stroke is very low. By doing so, the degree of tuning freedom can be improved.
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Abstract
Description
前記減衰力発生機構は、作動流体が流れる通路を有するバルブ本体と、前記バルブ本体の前記通路の開口部に対して内周側に突出したクランプ部及び外周側に突出したシート部と、内周側が前記クランプ部によってクランプされ外周側が前記シート部に着座して前記通路を閉じ前記通路側の作動流体の圧力を受けて撓んで開弁して前記通路を開く積層された複数のディスクを含むメインバルブと、前記シート部に着座する前記ディスクに開口部を有するサブ通路と、該ディスクよりも小径で該ディスクと前記クランプ部とで内周側がクランプされ、該ディスクに着座して前記サブ通路を閉じ、前記サブ通路側の作動流体の圧力を受けて撓んで開弁して前記サブ通路を開くサブディスクとを含むサブバルブとを備え、前記バルブ本体には、前記サブバルブの開弁時に前記サブディスクに当接してその開度を制限する規制部が設けられ、前記サブディスクには、前記規制部と当接する位置より径方向内側に連通孔が設けられていることを特徴とする。
図1に示すように、本実施形態に係る緩衝器1は、自動車のサスペンション装置に装着される単筒式の油圧緩衝器であって、作動流体である油液が封入されたシリンダ2内にピストン3が摺動可能に嵌装され、このピストン3によってシリンダ2内がシリンダ上室2Aとシリンダ下室2Bとの2室に画成されている。ピストン3には、ピストンロッド4の一端部が挿通されてナット5によって連結されており、ピストンロッド4の他端側は、シリンダ2の端部に装着されたロッドガイド(図示せず)及びオイルシール(図示せず)に挿通されて外部へ延出されている。シリンダ2の底部には、フリーピストン(図示せず)が摺動可能に嵌装されてガス室が形成されており、ガス室内に封入された高圧ガスの圧縮膨張によってピストンロッド4の伸縮に伴うシリンダ2の体積補償を行っている。
図4に示すように、一方の通路10の下端側の開口部10Aは、円形で、ピストン3の下端部の内周側に円周方向に沿って複数(図示の例では等間隔で5つ)配置されている。また、他方の通路11の下端側の開口部11Bは、細長い長方形で、ピストン3の下端部の外周側に円周方向に沿って複数(図示の例では等間隔で5つ)、配置されている。各開口部11Bは、円周方向において、開口部10Aの間に配置されている。通路10、11の上端側の開口10B、11Aは、ピストン3の上端部に同様に配置されている。
伸び側メインバルブ14を構成する複数のディスクのうち、シート部19に着座する通路ディスク24には、図6に示すように、ピストン3の下端部に突出する規制部21に対向して、円弧状の通路開口25が形成されている。また、通路ディスク24の外周部には、シリンダ上下室2A、2B間を常時連通するオリフィス通路18を構成する切欠(図2及び図3にのみ図示し、図6には、図示せず)が設けられている。通路ディスク24の上に重ねられる切欠ディスク26には、通路開口25に対向する複数の円弧状の開口、及び、この開口から径方向外側に切欠ディスク26の外周まで延びる直線状の開口からなる切欠27が形成されている。これらの通路ディスク24及び切欠ディスク26に平板状のディスク28を重ねることにより、通路開口25と切欠27とが連通して、通路10とシリンダ下室2Bとを接続するサブ通路29が形成されるようになっている。
ピストンロッド4の伸び行程時には、シリンダ2内のピストン3の摺動によりシリンダ上室2A側の油液が加圧されて、通路10、11を通ってシリンダ下室2B側へ流れる。このとき、ピストン速度低速域(伸び側サブバルブ17及び伸び側メインバルブ14の開弁前)においては、油液がオリフィス通路18を流通することにより、減衰力がピストン速度の2乗にほぼ比例するオリフィス特性の減衰力が発生する。
サブディスク30は、連通孔31を設けて、クランプされた部分の付近の撓み剛性を低下させることにより、図9(B)に示されるように、規制部21との接触部に加えて、クランプされた部分の付近への応力の集中を緩和することができる。図9(A)に示されるように、連通孔31を設けない場合、サブディスク30は、規制部21と接触部21及びクランプされた部分の付近に応力が集中して破損し易くなる。
また、上記実施形態では、第1減衰力発生機構12、第2減衰力発生機構13にそれぞれ縮み側サブバルブ15、伸び側サブバルブ17を設ける例を示したが、伸び行程と縮み行程とで減衰力特性を異ならせるために、例えば縮み側サブバルブ15のみ設ける構成としてもよい。縮み側サブバルブ15のみ設けることで、縮み行程のピストン速度が微低速領域のみ伸び側減衰力と比して減衰力を低くすることができる。このようにすることで、チューニング自由度を向上することができる。
Claims (3)
- 作動流体が封入されたシリンダと、
該シリンダ内に摺動可能に嵌装されたピストンと、
該ピストンに連結されて前記シリンダの外部に延出されたピストンロッドと、
前記シリンダ内の前記ピストンの摺動によって生じる作動流体の流れを制御して減衰力を発生させる減衰力発生機構と、
を備えた緩衝器において、
前記減衰力発生機構は、作動流体が流れる通路を有するバルブ本体と、
前記バルブ本体の前記通路の開口部に対して内周側に突出したクランプ部及び外周側に突出したシート部と、
内周側が前記クランプ部によってクランプされ外周側が前記シート部に着座して前記通路を閉じ前記通路側の作動流体の圧力を受けて撓んで開弁して前記通路を開く積層された複数のディスクを含むメインバルブと、
前記シート部に着座する前記ディスクに開口部を有するサブ通路と、
該ディスクよりも小径で該ディスクと前記クランプ部とで内周側がクランプされ、該ディスクに着座して前記サブ通路を閉じ、前記サブ通路側の作動流体の圧力を受けて撓んで開弁して前記サブ通路を開くサブディスクとを含むサブバルブとを備え、
前記バルブ本体には、前記サブバルブの開弁時に前記サブディスクに当接してその開度を制限する規制部が設けられ、前記サブディスクには、前記規制部と当接する位置より径方向内側に連通孔が設けられていることを特徴とする緩衝器。 - 前記連通孔は、前記サブディスクが前記サブ通路を閉じているときに、前記サブ通路と連通しない位置に設けられていることを特徴とする請求項1に記載の緩衝器。
- 前記ピストンには、伸び行程時に減衰力を発生させる第1減衰力発生機構と、縮み行程時に減衰力を発生させる第2減衰力発生機構とが設けられ、前記サブバルブは前記第2減衰力発生機構にのみ設けられることを特徴とする請求項1または2に記載の緩衝器。
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CN201480050559.3A CN105899837B (zh) | 2013-10-31 | 2014-10-29 | 缓冲器 |
DE112014004961.1T DE112014004961T5 (de) | 2013-10-31 | 2014-10-29 | Stossdämpfer |
US15/022,097 US9777790B2 (en) | 2013-10-31 | 2014-10-29 | Shock absorber |
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US9777790B2 (en) | 2017-10-03 |
JP5787961B2 (ja) | 2015-09-30 |
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US20160258504A1 (en) | 2016-09-08 |
JP2015086966A (ja) | 2015-05-07 |
CN105899837A (zh) | 2016-08-24 |
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