CN202531717U - Damping hole fine-adjustable hydraulic buffer - Google Patents
Damping hole fine-adjustable hydraulic buffer Download PDFInfo
- Publication number
- CN202531717U CN202531717U CN2012201219309U CN201220121930U CN202531717U CN 202531717 U CN202531717 U CN 202531717U CN 2012201219309 U CN2012201219309 U CN 2012201219309U CN 201220121930 U CN201220121930 U CN 201220121930U CN 202531717 U CN202531717 U CN 202531717U
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Abstract
The utility model discloses a damping hole fine-adjustable hydraulic buffer which comprises a housing body, a cylinder body, a position rod and an elastic resetting device, wherein the elastic resetting device is arranged on the housing, the cylinder body is arranged in the housing, the cylinder body is connected with the housing by an end cover, the position rod penetrates the end cover to slide at the inner wall of the cylinder body, an adjusting barrel is arranged between the other end of the cylinder body and the other end of the housing, a cylinder body damping hole is formed on the lower part of the cylinder body, an adjusting barrel damping hole is formed on the adjusting barrel, the cylinder body damping hole is concentric with the adjusting barrel damping hole when the buffer is initially installed, the inner thread of an adjusting nut is in threaded connection with the adjusting barrel, and the outer thread of the adjusting nut is in threaded connection with the housing. The damping hole fine-adjustable hydraulic buffer takes hydraulic oil as a work medium, and a moderation force is formed to the hydraulic oil when the hydraulic oil passes through the damping hole on the cylinder body, so that a buffer aim can be realized; and the threaded same connection or differential connection is formed between connection threads of the adjusting nut and the adjusting barrel and connection nuts of the adjusting nut and the housing, and the adjusting quantity of the damping hole can be more exactly controlled since the adjusting nut is rotated to drive the adjusting barrel to slide along the axial direction.
Description
Technical field
The utility model belongs to the hydraulic damping damping device, particularly a kind of damping hole fine turning hydraulic bjuffer.
Background technique
Hydraulic bjuffer is widely used in fields such as metallurgy, engineering machinery, special mechanical, and it not only can absorb huge Impact energy, and can design the buffering rule on request, working stability, reliable.Mostly existing buffer is certain fixed equipment specialized designs, and its buffer speed, bearing capacity are generally non-adjustable, and working environment adaptability is relatively poor.Mode through regulating damping groove or damping hole can realize the adjustable of buffer speed and bearing capacity.
Disclosed utility model patent " low-speed bidirectional regulating hydraulic buffer " on the Chinese patent document; Its notification number is CN101737376A; Form by housing, cylinder body, flip sleeve, piston rod, adjusting screw rod, end cap, seal arrangement etc.; Adopt the resetting means of spring as piston, the flip sleeve two ends in the housing have damping hole, are respectively equipped with point of adjustment at cylinder body left end and end cap right-hand member; Flip sleeve matches with adjusting screw rod on the cylinder body, the damping hole aperture regulate can through the adjustment adjusting screw rod make flip sleeve vertically move left and right realize.This regulative mode can be realized the adjusting of damping hole aperture; But the adjusting of damping hole aperture size difficult control, particularly damping hole are hour, and is often bigger through rotating the regulated quantity that adjusting screw rod obtains; Can't accomplish accurate regulating and controlling amount, cause bumper property to change greatly.
Disclosed utility model patent on the Chinese patent document " adjustable hydraulic buffer is used in the simulative automobile collision "; Its notification number is CN2677901Y; Form by cylinder body, cylinder cap, piston etc.; By inner cylinder liner and piston cylinder body is divided into hyperbaric chamber, low pressure chamber and energy-storing chamber three parts, the inner casing jacket wall is provided with impedance screw and return port; Piston and piston rod are fixed in the inner cylinder liner through end cap; Lining is enclosed between piston rod and the end cap; One-way valve is fixed on the piston by back-up ring, and support and end cap are fastened on by screw on the right-end openings of cylinder body, and piston rod and end cap and cylinder body seal with seal ring respectively; Ram by screw on piston rod end.Impedance screw through changing different size just can be regulated orifice size on a large scale.This regulative mode can be realized the adjusting of orifice size, but because will change the impedance screw of different size, thus can only regulate the some kinds of orifice sizes that configure, and need to structure carry out dismounting when regulating at every turn.
The model utility content
The purpose of the utility model is to provide a kind of can make the accurately damping hole fine turning hydraulic bjuffer of control of regulated quantity, solves adopting the accurately problem of regulating and controlling amount of buffer that damping hole carries out throttling.
The technical solution that realizes the utility model purpose is: a kind of damping groove adjustable hydraulic buffer, comprise housing, cylinder body, piston rod, elasticity reset device, and housing is provided with elasticity reset device; Cylinder body is arranged in the housing, and cylinder body is connected through end cap with housing, and piston rod passes end cap and slides at inboard wall of cylinder block; Between the cylinder body the other end and the housing the other end, be provided with and regulate tube; Inferior part of the cylinder block has the cylinder body damping hole, regulates to have on the tube and regulates the tube damping hole, and the cylinder body damping hole is concentric with adjusting tube damping hole when initially installing; The internal thread of adjusting nut is threaded with regulating tube, and the outside thread of adjusting nut is threaded with housing.
The utility model compared with prior art, its remarkable advantage: (1) is working medium with hydraulic oil, hydraulic oil forms restraining power during through the damping hole on the cylinder body, realizes the purpose of buffering.(2) adjusting nut forms screw thread along move or differential be connected with adjusting nut with the attaching nut of housing with the connecting thread of regulating tube, drives through the rotation adjusting nut and regulates the regulated quantity that tube slip vertically can be controlled damping hole more accurately.(3), use the variation of back hydraulic fluid temperature etc. like variation, field of employment variation of temperature and the continuous several times of load because damping hole is finely tuned, and this buffer has Environmental Conditions adaptability preferably.
Below in conjunction with accompanying drawing the utility model is described in further detail.
Description of drawings
Fig. 1 is the utility model embodiment 1 a structural representation.
Fig. 2 is the structural representation of the utility model adjusting nut.
Fig. 3 is the local enlarged diagram at the utility model A place.
Fig. 4 is the utility model embodiment 2 a structural representation.
Fig. 5 is the utility model embodiment 3 a structural representation.
Embodiment
Like Fig. 1, Fig. 2 and shown in Figure 3, the utility model damping groove adjustable hydraulic buffer comprises housing 6, cylinder body 5, piston rod 1, elasticity reset device; Housing 6 is provided with elasticity reset device; Cylinder body 5 is arranged in the housing 6, and cylinder body 5 is connected through end cap 2 with housing 6, and piston rod 1 passes end cap 2 and slides at cylinder body 5 inwalls; Between cylinder body 5 the other ends and housing 6 the other ends, be provided with and regulate tube 7; Cylinder body 5 bottoms have cylinder body damping hole 12, regulate to have on the tube 7 and regulate tube damping hole 11, and cylinder body damping hole 12 is concentric with adjusting tube damping hole 11 when initially installing; The internal thread of adjusting nut 9 is threaded with regulating tube 7, and the outside thread of adjusting nut 9 is threaded with housing 6.
Wherein, form the 3rd cavity III between housing 6 and the cylinder body 5, an end of housing 6 and an end of cylinder body 5 are fixed on the end cap 2, on end cap 2, screw hole are set, and screw 3 passes screw hole and respectively an end of housing 6 and cylinder body 5 is fixed on the end cap 2.Erection support 8 is connected the bottom of cylinder body 5 the other ends through the mode of welding; Between end cap 2 and housing 6, the cylinder body 5 seal ring is set respectively.The piston of piston rod 1 one ends is divided into the first cavity I and the second cavity II with cylinder body 5, and the other end of piston rod 1 passes end cap 2 and is connected with load, between piston rod 1 and the end cap 2 seal ring is set; Between piston rod 1 and the cylinder body 5 seal ring is set.
Through hole is set as fluid hole 15 on one end of cylinder body 5, liquid conduits 4 one ends are connected with this through hole, and the other end is immersed in the hydraulic oil in the 3rd cavity III all the time; Liquid conduits 4 is communicated with the 3rd cavity III and the second cavity II, and the through hole on cylinder body 5 one ends is between the piston of end cap 2 and piston rod 1, and the piston of piston rod 1 and cylinder body 5 contact segment length are half the greater than fluid hole 15 height.
Regulate between tube 7 and the cylinder body 5 and be connected through feather key 10; Tube 7 relative cylinder body 5 axial rotation are regulated in these feather key 10 restrictions; Make and regulate tube 7 and can move axially through rotating adjusting nut 9, regulate between tube 7 and the cylinder body 5 seal ring is set along cylinder body 5, regulate tins 7 and housing 6 between seal ring is set.
Elasticity reset device is made up of liquid conduits 4, gas conduit 13, air bag 14, on an end of housing 6, through hole is set, and an end of gas conduit 13 is connected with this through hole, and the other end of gas conduit 13 is connected with air bag 14.
The utility model working principle is following: piston rod 1 moves downward under the load effect; And extruding hydraulic oil; Liquid in the I chamber can only flow to the II chamber from cylinder body damping hole 12 and the fluid hole of regulating 11 formation of tube damping hole; Form restraining power,, arrive at cylinder bottom up to piston rod 1 to the load generating buffer function; II chamber excess liquid flows into the III chamber through liquid conduits 4, and liquid stores the energy that resets through the gas in gas conduit 13 compressing gasbags 14 in the III chamber; After load disappears; Gas expands in the air bag 14, hydraulic oil in the compression III chamber, and hydraulic oil passed through cylinder body damping hole 12 and regulated the fluid hole flow direction entering I chamber that tube damping hole 11 forms this moment; The I chamber is identical with fluid pressure in the II chamber; In the I chamber liquid to the active area of piston rod 1 greater than liquid in the II chamber to the active area of piston rod 1, piston rod 1 receives thrust upwards, piston rod 1 resets.
Regulate tube damping hole 11 and be directly proportional with buffer speed with the liquid chunnel size that cylinder body damping hole 12 forms, the adjusting of regulating the liquid chunnel size that tube damping hole 11 and cylinder body damping hole 12 form can axially move up and down realization along cylinder body 5 through adjusting tins 7; Shown in Figure 2 for regulating the barrel structure schematic representation; Shown in Figure 3 be adjusting nut 9, regulate the thread connecting mode partial enlarged drawing between tube 7 and the housing 6; Adjusting nut 9 is identical with the connecting thread rotation direction of housing 6 with the connecting thread of regulating tube 7 and adjusting nut 9, can realize the differential connection of screw thread like this; The distance that adjusting nut 9 rotations one circle adjusting tube 7 moves is the pitch difference of two connecting threads; On adjusting nut 9 and housing 6, engrave scale, the regulated quantity of the liquid chunnel size that forms between regulating and controlling tube damping hole 11 and the cylinder body damping hole 12 so accurately.
As shown in Figure 4, present embodiment is the structure of elasticity reset device with embodiment 1 different place, has saved air bag 14, gas conduit 13 and liquid conduits 4, increases return piston 16, Returnning spring 17, on end cap 2, offers vent 18.Elasticity reset device is arranged in the 3rd cavity III; Form by fluid hole 15, return piston 16, Returnning spring 17, vent 18; One end of Returnning spring 17 is fixedly connected on the end of end cap 2 in the III chamber; The center line of Returnning spring 17 is parallel with the center line of piston rod 1, and return piston 16 is fixedly connected with the other end of Returnning spring 17, offers vent 18 on the end cap 2; Return piston 16 cooperates with cylinder body 5, housing 6, between return piston 16 and housing 6, the cylinder body 5 seal ring is set respectively.
The utility model working principle is as as follows: piston rod 1 moves downward under the load effect; And extruding hydraulic oil; Liquid in the I chamber can only flow to the II chamber from cylinder body damping hole 12 and the fluid hole of regulating 11 formation of tube damping hole; Form restraining power,, arrive at cylinder bottom up to piston rod 1 to the load generating buffer function; II chamber excess liquid flows into the III chamber through fluid hole 18, and liquid stores the energy that resets through return piston 16 compression reseting springs 17 in the III chamber; After load disappears; Returnning spring 17 is through hydraulic oil in the return piston 16 compression III chambeies; Hydraulic oil refluxed through the liquid chunnel of regulating tube damping hole 11 and cylinder body damping hole 12 and forming and got into the I chamber this moment, and the I chamber is identical with fluid pressure in the II chamber, in the I chamber liquid to the active area of piston rod 1 greater than liquid in the II chamber to the active area of piston rod 1; Piston rod 1 receives thrust upwards, and piston rod 1 resets.
It is identical with embodiment 1 to regulate the big or small adjusting of the liquid chunnel that forms between tube damping hole 11 and the cylinder body damping hole 12.
As shown in Figure 5, present embodiment is the structure of elasticity reset device with embodiment 1 different place, has saved air bag 14, gas conduit 13 and liquid conduits 4, increases elastic energy storage component 19.Elasticity reset device is arranged in the 3rd cavity III, is made up of elastic energy storage component 19, and this elastic energy storage component 19 is arranged on the end of end cap 2 in the III chamber.Elastic energy storage component 19 cooperates with cylinder body 5, housing 6 and is fixed on the end cap 2.
The utility model working principle is as as follows: piston rod 1 moves downward under the load effect; And extruding hydraulic oil; Liquid in the I chamber can only flow to the II chamber from cylinder body damping hole 12 and the fluid hole of regulating 11 formation of tube damping hole; Form restraining power,, arrive at cylinder bottom up to piston rod 1 to the load generating buffer function; II chamber excess liquid flows into the III chamber through fluid hole 18, and liquid compression elastic energy storage component 19 in the III chamber stores the energy that resets; After load disappears; Hydraulic oil in the elastic energy storage component 19 compression III chambeies; Hydraulic oil refluxed through the liquid chunnel of regulating tube damping hole 11 and cylinder body damping hole 12 and forming and got into the I chamber this moment, and the I chamber is identical with fluid pressure in the II chamber, in the I chamber liquid to the active area of piston rod 1 greater than liquid in the II chamber to the active area of piston rod 1; Piston rod 1 receives thrust upwards, and piston rod 1 resets.
Claims (8)
1. damping groove adjustable hydraulic buffer; Comprise housing (6), cylinder body (5), piston rod (1), elasticity reset device, housing (6) is provided with elasticity reset device, and cylinder body (5) is arranged in the housing (6); Cylinder body (5) is connected through end cap (2) with housing (6); Piston rod (1) passes end cap (2) and slides at cylinder body (5) inwall, it is characterized in that: between cylinder body (5) the other end and housing (6) the other end, be provided with and regulate tube (7), cylinder body (5) bottom has cylinder body damping hole (12); Regulate to have on the tube (7) and regulate tube damping hole (11); Cylinder body damping hole (12) is concentric with adjusting tube damping hole (11) during initial the installation, and the internal thread of adjusting nut (9) is threaded with regulating tube (7), and the outside thread of adjusting nut (9) is threaded with housing (6).
2. damping groove adjustable hydraulic buffer according to claim 1; It is characterized in that: form the 3rd cavity III between housing (6) and the cylinder body (5); One end of one end of housing (6) and cylinder body (5) is fixed on the end cap (2), and erection support (8) is connected the bottom of cylinder body (5) the other end through the mode of welding; End cap (2) and housing (6), cylinder body are provided with seal ring respectively between (5).
3. damping groove adjustable hydraulic buffer according to claim 1; It is characterized in that: the piston of piston rod (1) one end is divided into the first cavity I and the second cavity II with cylinder body (5); The other end of piston rod (1) passes end cap (2) and is connected with load, between piston rod (1) and the end cap (2) seal ring is set; Between piston rod (1) and the cylinder body (5) seal ring is set.
4. damping groove adjustable hydraulic buffer according to claim 1; It is characterized in that: through hole is set on the end of cylinder body (5) as fluid hole (15); Liquid conduits (4) one ends are connected with this through hole, and the other end is immersed in the hydraulic oil in the 3rd cavity III all the time; Liquid conduits (4) is communicated with the 3rd cavity III and the second cavity II; Through hole on cylinder body (5) one ends is positioned between the piston of end cap (2) and piston rod (1), and the piston of piston rod (1) and cylinder body (5) contact segment length are half the greater than fluid hole (15) height.
5. damping groove adjustable hydraulic buffer according to claim 1; It is characterized in that: regulate between tube (7) and the cylinder body (5) and be connected through feather key (10); Tube (7) cylinder body (5) axial rotation is relatively regulated in this feather key (10) restriction; Through rotating adjusting nut (9) adjusting tube (7) can be moved axially along cylinder body (5), regulate between tube (7) and the cylinder body (5) seal ring is set, regulate between tin (7) and the housing (6) seal ring is set.
6. damping groove adjustable hydraulic buffer according to claim 1; It is characterized in that: elasticity reset device is made up of liquid conduits (4), gas conduit (13), air bag (14); On an end of housing (6), through hole is set; One end of gas conduit (13) is connected with this through hole, and the other end of gas conduit (13) is connected with air bag (14).
7. damping groove adjustable hydraulic buffer according to claim 1; It is characterized in that: elasticity reset device is arranged in the 3rd cavity III; Form by fluid hole (15), return piston (16), Returnning spring (17), vent (18); One end of Returnning spring (17) is fixedly connected on the end of end cap (2) in the III chamber; The center line of Returnning spring (17) is parallel with the center line of piston rod (1), and return piston (16) is fixedly connected with the other end of Returnning spring (17), offers vent (18) on the end cap (2); Return piston (16) and housing (6), cylinder body are provided with seal ring respectively between (5).
8. damping groove adjustable hydraulic buffer according to claim 1; It is characterized in that: elasticity reset device is arranged in the 3rd cavity III; Be made up of elastic energy storage component (19), this elastic energy storage component (19) is arranged on the end of end cap (2) in the III chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201219309U CN202531717U (en) | 2012-03-28 | 2012-03-28 | Damping hole fine-adjustable hydraulic buffer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201219309U CN202531717U (en) | 2012-03-28 | 2012-03-28 | Damping hole fine-adjustable hydraulic buffer |
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| Publication Number | Publication Date |
|---|---|
| CN202531717U true CN202531717U (en) | 2012-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201219309U Expired - Fee Related CN202531717U (en) | 2012-03-28 | 2012-03-28 | Damping hole fine-adjustable hydraulic buffer |
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| CN103867626A (en) * | 2014-04-09 | 2014-06-18 | 苏州市相城区明达复合材料厂 | Efficient rubber cushion |
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| CN104047987A (en) * | 2014-06-18 | 2014-09-17 | 江苏大学 | Novel hydro-pneumatic spring |
| CN104179872A (en) * | 2014-07-24 | 2014-12-03 | 三一矿机有限公司 | Variable damping oil-gas suspension cylinder and mining dump truck thereof |
| CN105317917A (en) * | 2015-11-26 | 2016-02-10 | 苏州市顺仪五金有限公司 | Hydraulic buffering and limiting induction assembly |
| CN105317919A (en) * | 2015-11-26 | 2016-02-10 | 苏州市顺仪五金有限公司 | Hydraulic buffering guide induction assembly |
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| CN105333125A (en) * | 2015-11-26 | 2016-02-17 | 苏州市顺仪五金有限公司 | Hydraulic buffering assembly |
| CN105351422A (en) * | 2015-11-26 | 2016-02-24 | 苏州市顺仪五金有限公司 | Hydraulic buffering and guiding assembly |
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| CN106870623A (en) * | 2016-12-27 | 2017-06-20 | 马鹏程 | A kind of novel automobile shock absorber assembly |
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| CN107355506A (en) * | 2017-07-05 | 2017-11-17 | 无锡比德希减震阻尼技术有限公司 | A kind of air-fuel mixture formula buffer |
| CN107514438A (en) * | 2016-07-23 | 2017-12-26 | 襄阳博亚精工装备股份有限公司 | A kind of two-way hydraulic buffer |
| CN108916295A (en) * | 2018-06-11 | 2018-11-30 | 武汉船用机械有限责任公司 | A kind of accuracy control method of cushion cylinder |
| WO2019000719A1 (en) * | 2017-06-29 | 2019-01-03 | 黄永宁 | Automatic regulating valve of shock absorber and multistep oil drainage method therefor |
| CN109296308A (en) * | 2018-09-06 | 2019-02-01 | 三峡大学 | Weight counterbalance fluid device |
| CN109564129A (en) * | 2016-09-27 | 2019-04-02 | 赛多利斯实验室仪器有限责任两合公司 | The purposes and laboratory equipment of hydraulic shock damping device |
| CN110921458A (en) * | 2019-12-16 | 2020-03-27 | 泗县金皖泵业有限公司 | Snub type hydraulic buffer |
| CN111059195A (en) * | 2019-12-18 | 2020-04-24 | 叶红燕 | Active damping self-adaptive shock absorber |
| CN112594247A (en) * | 2020-12-24 | 2021-04-02 | 广州风神汽车有限公司 | Bidirectional damping buffer oil cylinder |
| CN112747073A (en) * | 2020-12-10 | 2021-05-04 | 中国计量大学上虞高等研究院有限公司 | Intelligent hydraulic buffer and buffering method |
| CN113639000A (en) * | 2021-08-23 | 2021-11-12 | 南京林业大学 | Double-oil-cylinder single-rod viscous fluid damper |
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2012
- 2012-03-28 CN CN2012201219309U patent/CN202531717U/en not_active Expired - Fee Related
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| CN103883661A (en) * | 2014-03-13 | 2014-06-25 | 江苏大学 | Slide valve type variable-damping shock absorber matched with air spring and working method thereof |
| CN103867626A (en) * | 2014-04-09 | 2014-06-18 | 苏州市相城区明达复合材料厂 | Efficient rubber cushion |
| CN104047987A (en) * | 2014-06-18 | 2014-09-17 | 江苏大学 | Novel hydro-pneumatic spring |
| CN104047987B (en) * | 2014-06-18 | 2016-03-02 | 江苏大学 | A kind of Novel oil gas spring |
| CN104179872A (en) * | 2014-07-24 | 2014-12-03 | 三一矿机有限公司 | Variable damping oil-gas suspension cylinder and mining dump truck thereof |
| CN105317919A (en) * | 2015-11-26 | 2016-02-10 | 苏州市顺仪五金有限公司 | Hydraulic buffering guide induction assembly |
| CN105317917A (en) * | 2015-11-26 | 2016-02-10 | 苏州市顺仪五金有限公司 | Hydraulic buffering and limiting induction assembly |
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| CN105317918A (en) * | 2015-11-26 | 2016-02-10 | 苏州市顺仪五金有限公司 | Hydraulic buffering and limiting guide induction assembly |
| CN105387121A (en) * | 2015-11-26 | 2016-03-09 | 苏州市顺仪五金有限公司 | Hydraulic buffer limiting assembly |
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| CN109564129A (en) * | 2016-09-27 | 2019-04-02 | 赛多利斯实验室仪器有限责任两合公司 | The purposes and laboratory equipment of hydraulic shock damping device |
| CN107061611A (en) * | 2016-12-19 | 2017-08-18 | 浙江大学 | A kind of swash plate spring assembly of decay swash plate dither and measurement swash plate angle |
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| CN106870623A (en) * | 2016-12-27 | 2017-06-20 | 马鹏程 | A kind of novel automobile shock absorber assembly |
| WO2019000719A1 (en) * | 2017-06-29 | 2019-01-03 | 黄永宁 | Automatic regulating valve of shock absorber and multistep oil drainage method therefor |
| CN107355506A (en) * | 2017-07-05 | 2017-11-17 | 无锡比德希减震阻尼技术有限公司 | A kind of air-fuel mixture formula buffer |
| CN108916295A (en) * | 2018-06-11 | 2018-11-30 | 武汉船用机械有限责任公司 | A kind of accuracy control method of cushion cylinder |
| CN109296308A (en) * | 2018-09-06 | 2019-02-01 | 三峡大学 | Weight counterbalance fluid device |
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| CN110921458A (en) * | 2019-12-16 | 2020-03-27 | 泗县金皖泵业有限公司 | Snub type hydraulic buffer |
| CN111059195A (en) * | 2019-12-18 | 2020-04-24 | 叶红燕 | Active damping self-adaptive shock absorber |
| CN112747073A (en) * | 2020-12-10 | 2021-05-04 | 中国计量大学上虞高等研究院有限公司 | Intelligent hydraulic buffer and buffering method |
| CN112594247A (en) * | 2020-12-24 | 2021-04-02 | 广州风神汽车有限公司 | Bidirectional damping buffer oil cylinder |
| CN113639000A (en) * | 2021-08-23 | 2021-11-12 | 南京林业大学 | Double-oil-cylinder single-rod viscous fluid damper |
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Granted publication date: 20121114 Termination date: 20140328 |