WO2015037326A1 - 単筒型液圧緩衝器 - Google Patents
単筒型液圧緩衝器 Download PDFInfo
- Publication number
- WO2015037326A1 WO2015037326A1 PCT/JP2014/068862 JP2014068862W WO2015037326A1 WO 2015037326 A1 WO2015037326 A1 WO 2015037326A1 JP 2014068862 W JP2014068862 W JP 2014068862W WO 2015037326 A1 WO2015037326 A1 WO 2015037326A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shock absorber
- cylinder
- free piston
- type hydraulic
- hydraulic shock
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/061—Mono-tubular units
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/066—Units characterised by the partition, baffle or like element
- F16F9/067—Partitions of the piston type, e.g. sliding pistons
-
- 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
-
- 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
-
- 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
Definitions
- the present invention relates to a single cylinder type hydraulic shock absorber.
- a single cylinder type hydraulic shock absorber is generally inserted into a cylinder, a free piston which is slidably inserted into the cylinder and divides the cylinder into a liquid chamber and a gas chamber, and is slidably inserted into the cylinder.
- annular groove is formed on the outer periphery of the free piston, and an O-ring is attached.
- the single cylinder side hydraulic pressure buffer is configured to prevent the gas in the gas chamber from leaking into the liquid chamber by sealing between the cylinder and the free piston with an O-ring (for example, JP8- 152037A).
- the O-ring may come into close contact with the cylinder to generate friction, and only the free piston may move with respect to the cylinder. For this reason, in the single cylinder type hydraulic shock absorber described above, the supply / discharge path communicating with the annular groove on the outer periphery of the free piston on the liquid chamber side so that the free piston can move in parallel in the axial direction with respect to the O-ring. Is provided.
- An object of the present invention is to provide a single cylinder type hydraulic shock absorber that can realize a smooth displacement of a free piston and can alleviate a sudden change in damping force.
- a single cylinder type hydraulic shock absorber a cylinder, and a free piston that divides the cylinder into a liquid chamber filled with hydraulic fluid and a gas chamber filled with gas.
- a piston that is slidably inserted into the cylinder and divides the liquid chamber into two working chambers, and a seal ring that is provided on an outer periphery of the free piston and seals between the cylinder and the free piston.
- a single cylinder type hydraulic shock absorber provided with a lubricating oil sealed in the gas chamber and lubricating between the seal ring and the cylinder.
- FIG. 1 is a cross-sectional view of a single cylinder type hydraulic shock absorber according to an embodiment of the present invention.
- FIG. 2 is a view showing a modification of the free piston.
- FIG. 3 is a view showing another modification of the free piston.
- FIG. 4 is a view showing a modification of the single cylinder type hydraulic shock absorber.
- the single cylinder type hydraulic shock absorber S is slidably inserted into the cylinder 1, a free piston 2 that divides the cylinder 1 into a liquid chamber L and a gas chamber G, and the cylinder 1.
- the cylinder 3 and the free piston 2 are mounted in a piston 3 that partitions the liquid chamber L into an extension side chamber R1 and a pressure side chamber R2 as two working chambers, and an annular groove 2a provided on the outer periphery of the free piston 2.
- an O-ring 4 serving as a seal ring for sealing between the two and a lubricating oil J sealed in the gas chamber G.
- the extension side chamber R1 and the pressure side chamber R2 are filled with hydraulic oil as hydraulic fluid.
- the gas chamber G is filled with, for example, an inert gas such as nitrogen at a predetermined pressure.
- the single cylinder type hydraulic shock absorber S includes a piston rod 5 that is connected to the piston 3 at one end and is movably inserted into the cylinder 1.
- the piston rod 5 is provided so as to protrude outside the cylinder 1. Further, it is pivotally supported by an annular rod guide 6 that is provided at the upper end of the cylinder 1 and seals the inside of the cylinder 1.
- the single cylinder type hydraulic shock absorber S can be interposed between the vehicle body and the axle of the vehicle via attachment portions (not shown) provided at the upper end of the piston rod 5 and the lower end of the cylinder 1. It has become.
- the piston 3 is provided with a passage 3a that communicates the extension side chamber R1 and the pressure side chamber R2.
- a damping force generating element 3b is provided in the middle of the passage 3a.
- the damping force generating element 3b may be any element that gives resistance to the flow of hydraulic oil and causes a predetermined pressure loss when the hydraulic oil passes through the passage 3a.
- a damping valve such as an orifice or a leaf valve can be employed.
- passage 3a only one passage 3a is provided, but a plurality of passages 3a may be provided.
- the free piston 2 has a bottomed cylindrical shape and is provided with an annular groove 2a along the circumferential direction on the outer periphery.
- An O-ring 4 as a seal ring is mounted in the annular groove 2a.
- the O-ring 4 seals between the inner periphery of the cylinder 1 and the free piston 2. That is, the liquid chamber L and the gas chamber G are tightly sealed. Thereby, the single cylinder type hydraulic shock absorber S prevents the gas in the gas chamber G from leaking into the liquid chamber L and the hydraulic oil in the liquid chamber L from leaking into the gas chamber G.
- an annular seal member such as an annular packing can be used as the seal ring.
- the single cylinder type hydraulic shock absorber S when the piston 3 moves in the vertical direction in FIG. 1 with respect to the cylinder 1, the volume decreases from the expansion side chamber R1 (pressure side chamber R2) whose volume decreases as the piston 3 moves.
- the working oil moves through the passage 3a to the increasing pressure side chamber R2 (extension side chamber R1).
- the single cylinder type hydraulic shock absorber S gives resistance to the flow of the hydraulic oil passing through the passage 3a by the damping force generating element 3b to cause a pressure loss, whereby the extension side chamber R1 and the pressure side chamber R2 A differential pressure is generated in the to exert a damping force.
- the single cylinder type hydraulic shock absorber S has a gas chamber G caused by displacement of the volume in the cylinder 1 caused by the piston rod 5 entering and exiting the cylinder 1 and displacement of the free piston 2 in the axial direction within the cylinder 1. This is compensated by the volume change.
- the amount of the lubricating oil J is limited so as not to affect the compression operation when the single cylinder type hydraulic shock absorber S is most compressed. That is, the single cylinder type hydraulic shock absorber S compensates the volume of the piston rod 5 entering and exiting the cylinder 1 by the volume change of the gas in the gas chamber G when expanding and contracting. When the mold hydraulic pressure buffer S is most compressed, the gas chamber G whose volume is reduced is not filled with the lubricating oil J.
- the single cylinder type hydraulic shock absorber S configured as described above is used by being interposed between the vehicle body and the axle of the vehicle, for example, and is attenuated by expansion and contraction with respect to vibration input from the vehicle body and the wheels. Demonstrate the force and suppress the vibration of the car body and wheels.
- the single cylinder type hydraulic shock absorber S Since the single cylinder type hydraulic shock absorber S is used for suppressing vibration, vibration is input from the outside.
- the lubricating oil J is shaken in the gas chamber G and adheres to the inner peripheral surface of the cylinder 1. According to this, the inner peripheral surface in the gas chamber G in the cylinder 1 can be lubricated.
- the space between the O-ring 4 and the cylinder 1 is lubricated by the lubricating oil J so that the free piston 2 can move smoothly. Therefore, sudden change in damping force can be mitigated. Therefore, when the single cylinder type hydraulic shock absorber S is installed between the vehicle body and the axle of the vehicle and incorporated in the suspension of the vehicle, the ride comfort in the vehicle can be improved.
- the outer diameter of the outer circumference 2b on the gas chamber G side of the free piston 2 is smaller than the outer diameter of the outer circumference 2c on the liquid chamber L side of the annular groove 2a, and the liquid chamber is larger than the annular groove 2a.
- the axial distance from the gas chamber G side end to the annular groove 2a is shorter than the axial distance from the liquid chamber L side end of the free piston 2 to the annular groove 2a. For this reason, the part where the clearance between the cylinder 1 and the free piston 2 is reduced can be lengthened, and the lubricating oil J passes between the cylinder 1 and the free piston 2 before reaching the O-ring 4. The length to be done can be shortened. Therefore, the lubrication effect and the operational stability of the free piston 2 are further improved.
- the friction coefficient when the cylinder 1 and the O-ring 4 are lubricated with the lubricating oil J is such that the cylinder 1 and the O-ring 4 are lubricated with the working oil filled in the extension side chamber R1 and the pressure side chamber R2, which are working chambers. It is preferable that the coefficient of friction is lower than the friction coefficient. That is, it is preferable that the lubricating oil J has higher lubricity than the hydraulic oil. By doing in this way, even if the hydraulic oil has poor lubricity, the free piston 2 can be made smoother relative to the cylinder 1 by lubricating the space between the O-ring 4 and the cylinder 1 with the lubricating oil J. Can be displaced.
- the lubricity can be measured by an evaluation method using a hydraulic pump (ASTM D2282), a four-ball test (JIS K2519, ASTM D2596-87), an FZG gear test (DIN 51354), and the like. Therefore, the lubricating property of the lubricating oil J may be made higher than the lubricating property of the hydraulic oil by the above evaluation test.
- the bottomed cylindrical free piston 2 is arranged with the inner side facing the gas chamber G, but in the opposite direction, that is, with the inner side facing the liquid chamber L. May be.
- the single cylinder type hydraulic shock absorber S may be inverted, that is, the gas chamber G may be disposed above the liquid chamber L.
- the lubricating oil J always accumulates immediately above the free piston 2
- the O-ring 4 always comes into contact with the lubricating oil J.
- the space between the O-ring 4 and the cylinder 1 can be always lubricated, the displacement operation of the free piston 2 with respect to the cylinder 1 becomes smoother. Therefore, the sudden change in the damping force generated by the single cylinder type hydraulic shock absorber S can be further alleviated.
- the inner side of the free piston 2 is directed toward the liquid chamber L and the bottom is directed toward the gas chamber G. Even if the amount of the lubricating oil J is small, the space between the O-ring 4 and the cylinder 1 can be always lubricated. On the contrary, when the inside is directed to the gas chamber G side, the lubricating oil J accumulates in the free piston 2, so that the amount of the lubricating oil J enclosed is set to the inner volume of the free piston 2 in order to always lubricate. Must be more than. Therefore, the amount of the lubricating oil J can be reduced by disposing the inner side of the free piston 2 toward the liquid chamber L side.
- the free piston 2 has a bottomed cylindrical shape, but may have other shapes.
- an electroviscous fluid or a magnetorheological fluid can be used as the hydraulic fluid.
- the damping force generating element 3b provided in the piston 3 may be made to act on an electric field or a magnetic field corresponding to the hydraulic fluid passing through the passage 3a.
- the passage 3a is a hole that penetrates the piston 3 up and down, but a gap may be formed between the cylinder 1 and the piston 3, and the passage may be configured by the gap.
Abstract
Description
Claims (5)
- 単筒型液圧緩衝器であって、
シリンダと、
前記シリンダ内を作動液が充填される液室と気体が充填される気体室とに区画するフリーピストンと、
前記シリンダ内に摺動自在に挿入されて前記液室を二つの作動室に区画するピストンと、
前記フリーピストンの外周に設けられて前記シリンダと前記フリーピストンとの間をシールするシールリングと、
前記気体室内に封入されて前記シールリングと前記シリンダとの間を潤滑する潤滑油と、
を備えた単筒型液圧緩衝器。 - 請求項1に記載の単筒型液圧緩衝器であって、
前記フリーピストンの前記外周には、環状溝が設けられ、
前記シールリングは、前記環状溝内に装着され、
前記フリーピストンの前記外周における前記環状溝よりも前記気体室側の外径は、前記環状溝よりも前記液室側の外径よりも小さい、
単筒型液圧緩衝器。 - 請求項1に記載の単筒型液圧緩衝器であって、
前記フリーピストンの前記外周には、環状溝が設けられ、
前記シールリングは、前記環状溝内に装着され、
前記フリーピストンの前記外周における前記環状溝よりも前記気体室側は、前記気体室側端へ向かうほど外径が小さくなるテーパ状に形成される、
単筒型液圧緩衝器。 - 請求項1に記載の単筒型液圧緩衝器であって、
前記潤滑油は、前記作動液よりも潤滑性が高い、
単筒型液圧緩衝器。 - 請求項1に記載の単筒型液圧緩衝器であって、
前記気体室は、前記液室よりも上方に配置される、
単筒型液圧緩衝器。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/904,707 US9771999B2 (en) | 2013-09-13 | 2014-07-16 | Mono-tube type hydraulic shock absorber |
DE112014004204.8T DE112014004204T5 (de) | 2013-09-13 | 2014-07-16 | Hydraulikstoßdämpfer vom Einrohr-Typ |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013-190096 | 2013-09-13 | ||
JP2013190096A JP6212337B2 (ja) | 2013-09-13 | 2013-09-13 | 単筒型液圧緩衝器 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015037326A1 true WO2015037326A1 (ja) | 2015-03-19 |
Family
ID=52665449
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2014/068862 WO2015037326A1 (ja) | 2013-09-13 | 2014-07-16 | 単筒型液圧緩衝器 |
Country Status (4)
Country | Link |
---|---|
US (1) | US9771999B2 (ja) |
JP (1) | JP6212337B2 (ja) |
DE (1) | DE112014004204T5 (ja) |
WO (1) | WO2015037326A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106763415A (zh) * | 2017-03-24 | 2017-05-31 | 中国北方车辆研究所 | 油气弹簧浮动活塞 |
CN106801717A (zh) * | 2017-03-24 | 2017-06-06 | 中国北方车辆研究所 | 油气弹簧主活塞 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP6205445B2 (ja) * | 2016-03-15 | 2017-09-27 | Kyb株式会社 | 転倒防止装置、及びその取り付け方法 |
JP2017169858A (ja) * | 2016-03-24 | 2017-09-28 | Kyb株式会社 | 転倒防止装置、及びその取り付け方法 |
CN108425980A (zh) * | 2017-02-14 | 2018-08-21 | 贺德克国际有限公司 | 液压气动式活塞缸装置 |
DE102017112998A1 (de) * | 2017-06-13 | 2018-12-13 | Thyssenkrupp Ag | Schwingungsdämpfer |
JP2019052672A (ja) * | 2017-09-14 | 2019-04-04 | Kyb株式会社 | 緩衝器 |
GB2568484A (en) * | 2017-11-16 | 2019-05-22 | Bae Systems Plc | Suspension strut for a vehicle |
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2013
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-
2014
- 2014-07-16 US US14/904,707 patent/US9771999B2/en active Active
- 2014-07-16 DE DE112014004204.8T patent/DE112014004204T5/de not_active Ceased
- 2014-07-16 WO PCT/JP2014/068862 patent/WO2015037326A1/ja active Application Filing
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN106763415A (zh) * | 2017-03-24 | 2017-05-31 | 中国北方车辆研究所 | 油气弹簧浮动活塞 |
CN106801717A (zh) * | 2017-03-24 | 2017-06-06 | 中国北方车辆研究所 | 油气弹簧主活塞 |
Also Published As
Publication number | Publication date |
---|---|
US20160169316A1 (en) | 2016-06-16 |
JP2015055328A (ja) | 2015-03-23 |
US9771999B2 (en) | 2017-09-26 |
DE112014004204T5 (de) | 2016-06-02 |
JP6212337B2 (ja) | 2017-10-11 |
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