CN102367857A - Adjustable force type hydraulic damper - Google Patents
Adjustable force type hydraulic damper Download PDFInfo
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- CN102367857A CN102367857A CN2011102802520A CN201110280252A CN102367857A CN 102367857 A CN102367857 A CN 102367857A CN 2011102802520 A CN2011102802520 A CN 2011102802520A CN 201110280252 A CN201110280252 A CN 201110280252A CN 102367857 A CN102367857 A CN 102367857A
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- piston
- seal ring
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- 238000013016 damping Methods 0.000 claims abstract description 75
- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 239000003921 oil Substances 0.000 claims description 122
- 239000011148 porous material Substances 0.000 claims description 25
- 239000010720 hydraulic oil Substances 0.000 claims description 18
- 230000008844 regulatory mechanism Effects 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000010727 cylinder oil Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 10
- 208000032836 Ring chromosome 15 syndrome Diseases 0.000 description 5
- 208000032837 Ring chromosome 16 syndrome Diseases 0.000 description 5
- 208000035389 Ring chromosome 6 syndrome Diseases 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 101100326791 Caenorhabditis elegans cap-2 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention aims to provide an adjustable force type hydraulic damper, which has a simple radial sealing structure, good sealing effects and a simple damping adjustment mechanism structure, needs no concentric arrangement of an inner cylinder and an outer cylinder, and can be manufactured easily. The adjustable force type hydraulic damper comprises the inner cylinder, the outer cylinder, a piston and a piston pulling rod; and the inner cylinder is divided by the piston into a damping cylinder and an oil return cylinder, the piston pulling rod is provided with a radial sealing ring which comprises a front sealing ring and a rear sealing ring, and a pressure relief hole between the front sealing ring and the rear sealing ring is communicated with the outer cylinder. The radial sealing structure on the piston pulling rod is simple, the sealing effect is good, the damping adjustment mechanism structure is simple, the inner cylinder and the outer cylinder need not to be arranged concentrically, and the adjustable force type hydraulic damper can be manufactured easily. An exhaust plug screw is adopted for sealing, and the exhaust structure is simple.
Description
Technical field
The present invention relates to the damping oil cylinder field, the radial seal structure on especially a kind of piston pulling rod is simple and sealing effect is better, damper regulation mechanism is simple in structure, inner cylinder and outer oil cylinder do not need to be provided with one heart and to make and be easy to power value adjustable hydraulic damper.
Background technique
The model utility of Chinese patent notification number CN2283149Y discloses a kind of adjustable hydraulic damper; Have the inner cylinder and the outer oil cylinder of concentric setting and be arranged on piston and the piston pulling rod in the inner cylinder; Piston is separated into damping oil cylinder and oil return oil cylinder with inner cylinder; And be provided with one-way valve with the guiding of the hydraulic oil in oil return oil cylinder damping oil cylinder; Outer oil cylinder is with the one-way valve that also is provided with between the oil return oil cylinder the hydraulic oil in outer oil cylinder guiding oil return oil cylinder, is provided with the damping cover and damping put the damping engage sleeves of set communication damping oil cylinder with the damp channel capping of outer oil cylinder at the opposite side of damping oil cylinder, and have and drive the damping adjusting driving mechanism that damping cover or damping engage sleeves are rotated; Piston pulling rod is provided with radial direction seal ring; The side direction of this radial direction seal ring is provided with pressure spring and compression spring, and in the laterally disposed next door that together damping oil cylinder is cut off of radial direction seal ring, the center hole in this next door with piston pulling rod movingly; And next door is with forming low pressure chamber between the radial direction seal ring, and this low pressure chamber is provided with the overflow hole with outer oil cylinder communication.The deficiency that this adjustable hydraulic damper exists is: the radial seal on the piston pulling rod has radial direction seal ring, pressure spring and compression spring, and complex structure and single track sealing effect are relatively poor; Damper regulation mechanism is by damping cover, the damping engage sleeves of arranging vertically and be used for the damping cover or damping that the damping engage sleeves is rotated is regulated driving mechanism and formed, for rapid operation mounting plane ball bearing between rotating component and fixed block also, complex structure; Inner cylinder needs to be provided with one heart and to make trouble with outer oil cylinder; Therefore, it is simple and sealing effect is better, damper regulation mechanism is simple in structure, inner cylinder and outer oil cylinder do not need to be provided with one heart and to make to be easy to power value adjustable hydraulic damper to design radial seal structure on a kind of piston pulling rod, becomes problem demanding prompt solution.
Summary of the invention
The deficiency that the objective of the invention is that there is the radial seal structure complicacy on the piston pulling rod in present power value adjustable hydraulic damper and sealing effect is relatively poor in order to overcome, damper regulation mechanism complex structure, inner cylinder and outer oil cylinder needs is provided with and makes trouble with one heart provides radial seal structure on a kind of piston pulling rod simple and sealing effect is better, damper regulation mechanism is simple in structure, inner cylinder and outer oil cylinder do not need to be provided with one heart and to make easy power value adjustable hydraulic damper.
Concrete technological scheme of the present invention is:
A kind of power value adjustable hydraulic damper comprises damper regulation mechanism, inner cylinder and outer oil cylinder and is arranged on the piston in the inner cylinder and passes the piston pulling rod of front cover; Piston pulling rod is provided with radial direction seal ring; Piston is separated into damping oil cylinder and oil return oil cylinder with inner cylinder, and is provided with the one-way valve with the guiding of the hydraulic oil in oil return oil cylinder damping oil cylinder, and outer oil cylinder is with the one-way valve that also is provided with between the oil return oil cylinder the guiding of the hydraulic oil in outer oil cylinder oil return oil cylinder; It is characterized in that: seal ring and back seal ring before described radial direction seal ring comprises; Described front cover is provided with relief hole; One end of relief hole is between preceding seal ring and back seal ring, and the other end of relief hole is communicated with outer oil cylinder.Seal ring and back seal ring before radial direction seal ring comprises, when back seal ring when the hydraulic oil seepage occurring since preceding seal ring stop and relief hole can with preceding seal ring with after hydraulic oil between the seal ring in time be back to outer oil cylinder, make outside hydraulic oil is difficult for leaking out; Radial seal structure on this power value adjustable hydraulic damper piston pull bar is simple and sealing effect is better.
As preferably, described damper regulation mechanism comprises damping adjustment sleeve and driving mechanism; The damping adjustment sleeve is positioned at aperture and the damping adjustment sleeve external diameter installation holes for matching that the front cover periphery is provided with, and the bottom surface of mounting hole is provided with the damping oil cylinder intercommunicating pore that is communicated with damping oil cylinder, and the sidewall of mounting hole is provided with the outer oil cylinder intercommunicating pore that is communicated with outer oil cylinder; Driving mechanism is fixedly connected with the damping adjustment sleeve.The damping adjustment sleeve is positioned at aperture and the damping adjustment sleeve external diameter installation holes for matching that the front cover periphery is provided with, and inner cylinder does not need concentric setting with outer oil cylinder; Radial seal structure on this power value adjustable hydraulic damper piston pull bar is simple and sealing effect is better, damper regulation mechanism is simple in structure and inner cylinder and outer oil cylinder do not need to be provided with one heart and make easily.
As preferably, described damping adjustment sleeve bottom surface is provided with and is used for the bottom outlet that is communicated with the damping oil cylinder intercommunicating pore, and the periphery of damping adjustment sleeve is provided with the adjustment hole that is communicated with bottom outlet with outer oil cylinder intercommunicating pore respective heights place.The damping adjustment sleeve is simple in structure, and adjustment hole cooperates with outer oil cylinder intercommunicating pore, can regulate multiple damping and satisfy the demand.
As preferably, the end face of described damping adjustment sleeve is provided with connection handle; Described driving mechanism comprises knob, stage clip and lock balls; The bottom surface of knob be provided with several along circle distribution and with the lock balls hole of lock balls coupling; Stage clip is positioned at the compression spring hole that the front cover periphery is provided with, and lock balls is pushed down in the lock balls hole, and lock balls is pushed down stage clip, and knob is fixedly connected with connection handle.Driving mechanism structure is simple, and is easy to adjust.As preferably, described front cover is provided with exhaust port and bleed screw; One end of exhaust port is positioned at the outer surface of front cover, and the other end of exhaust port is communicated with relief hole, and bleed screw is threaded with exhaust port.Screw out bleed screw exhaust easily, simple in structure with the bleed screw closed grate hole.
As preferably, be provided with conduit in the described outer oil cylinder, an end of conduit is communicated with outer oil cylinder intercommunicating pore and is fixedly connected with the front cover end face, and the other end of conduit is positioned at the opposite side of relief hole place, outer oil cylinder rear portion side.Have conduit, above the knob of power value adjustable hydraulic damper driving mechanism when laterally placing is positioned at, makes things convenient for adjusting or when power value adjustable hydraulic damper piston pull bar is upwards placed vertically, do not influence use.
As preferably, described power value adjustable hydraulic damper is provided with protecting jacket, and it is outer and be fixedly connected with front cover that protecting jacket is enclosed within piston pulling rod.Protecting jacket can be caught the hydraulic oil of seepage when current seal ring lost efficacy.
As preferably, the head of described piston pulling rod is provided with the draw ring buffer stopper inboard with being positioned at draw ring.Have draw ring and buffer stopper, comfortable when being convenient to installation and use.
The invention has the beneficial effects as follows:
Compared with prior art, said power value adjustable hydraulic damper has the following advantages: one. and the radial seal structure on this power value adjustable hydraulic damper piston pull bar is simple and sealing effect is better.Two. simple in structure and inner cylinder of damper regulation mechanism and outer oil cylinder do not need to be provided with one heart to be made easily.Three. the damping adjustment sleeve is simple in structure, and adjustment hole cooperates with outer oil cylinder intercommunicating pore, can regulate multiple damping and satisfy the demand, and driving mechanism structure is simple, and is easy to adjust.Four. simple in structure with the bleed screw closed grate hole.Five. have conduit, above the knob of power value adjustable hydraulic damper driving mechanism when laterally placing is positioned at, makes things convenient for adjusting or when power value adjustable hydraulic damper piston pull bar is upwards placed vertically, do not influence use.Six. protecting jacket can be caught the hydraulic oil of seepage when current seal ring lost efficacy.Seven. have draw ring and buffer stopper, comfortable when being convenient to installation and use.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is the structural representation of damping adjustment sleeve among Fig. 1;
Fig. 3 is the plan view of Fig. 2;
Fig. 4 is the A-A sectional view of Fig. 2.
Among the figure: outer oil cylinder-1; End cap-2; Relief hole-21; Mounting hole-22; Damping oil cylinder intercommunicating pore-23; Outer oil cylinder intercommunicating pore-24; Compression spring hole-25; Exhaust port-26; Damping adjustment sleeve-3; Bottom outlet-31; Adjustment hole-32; Connection handle-33; Driving mechanism-4; Knob-41; Stage clip-42; Lock balls-43; Lock balls hole-44; Protecting jacket-5; Draw ring-6; Buffer stopper-7; Conduit-8; Bleed screw-9; Piston-10; Piston pulling rod-11; Damping oil cylinder-12; Oil return oil cylinder-13; One-way valve-14; Preceding seal ring-15; Back seal ring-16.
Embodiment
Below in conjunction with shown in the accompanying drawing the present invention is described further.
Shown in accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, accompanying drawing 4: a kind of power value adjustable hydraulic damper; Comprise protecting jacket 5; Damper regulation mechanism, inner cylinder and outer oil cylinder 1 and be arranged on the piston 10 in the inner cylinder and pass the piston pulling rod 11 of front cover 2; The head of piston pulling rod 11 has draw ring 6 and the buffer stopper 7 that is positioned at draw ring 6 inboards, and the material of buffer stopper 7 is a rubber; Protecting jacket 5 be enclosed within piston pulling rod 11 outer and with front cover 2 clampings; Piston pulling rod 11 is provided with radial direction seal ring; Piston 10 is separated into damping oil cylinder 12 and oil return oil cylinder 13 with inner cylinder; And have the one-way valve 14 with the guiding of the hydraulic oil in the oil return oil cylinder 13 damping oil cylinder 12, outer oil cylinder 1 is with the one-way valve 14 that also has between the oil return oil cylinder 13 guiding of the hydraulic oil in the outer oil cylinder 1 oil return oil cylinder 13; Described damper regulation mechanism comprises damping adjustment sleeve 3 and driving mechanism 4.
Described damper regulation mechanism comprises damping adjustment sleeve 3 and driving mechanism 4; Damping adjustment sleeve 3 is positioned at the mounting hole 22 that aperture that front cover 2 peripheries have cooperates with damping adjustment sleeve 3 crest clearances; Has seal ring between damping adjustment sleeve 3 and the mounting hole 22; The bottom surface of mounting hole 22 has the damping oil cylinder intercommunicating pore 23 that is communicated with damping oil cylinder 12; The sidewall of mounting hole 22 has the outer oil cylinder intercommunicating pore 24 that is communicated with outer oil cylinder 1; Have conduit 8 in the outer oil cylinder 1, an end of conduit 8 be communicated with outer oil cylinder intercommunicating pore 24 and with the welding of the ear end face of front cover 2, the other end of conduit 8 is positioned at the opposite side that oil cylinder intercommunicating pore 24 outside the outer oil cylinder rear portion belongs to sides
Described damping adjustment sleeve 3 bottom surfaces have and are used for the bottom outlet 31 that is communicated with damping oil cylinder intercommunicating pore 23; Bottom outlet 31 is the big shoulder hole that is positioned at the bottom surface of holding, and the periphery of damping adjustment sleeve 3 has the adjustment hole 32 that is communicated with bottom outlet 31 with outer oil cylinder intercommunicating pore 24 respective heights places; Adjustment hole 32 has six peripheries along damping adjustment sleeve 3 in different apertures to be uniformly distributed with, and arranges in order according to pore size, adjustment hole 32 wherein five aperture less than the aperture of outer oil cylinder intercommunicating pore 24.
The end face of described damping adjustment sleeve 3 has connection handle 33; Described driving mechanism 4 comprises knob 41, stage clip 42 and lock balls 43; The bottom surface of knob 41 have six be uniformly distributed along the circumference and with the lock balls hole 44 of lock balls 43 coupling; Stage clip 42 is positioned at the compression spring hole 25 that front cover 2 peripheries have, and lock balls 43 is pushed down in lock balls hole 44, and lock balls 43 is pushed down stage clip 42, and knob 41 is threaded with connection handle 33.
The working procedure of this power value adjustable hydraulic damper is following: rotary knob 41 makes corresponding adjustment hole 32 align with outer oil cylinder intercommunicating pore 24 and produces the damping that requires to the relevant position; Force in draw ring 6 when pulling out piston pulling rod 11 with piston 10; Hydraulic oil in the damping oil cylinder 12 flows into outer oil cylinder 1 through bottom outlet 31, adjustment hole 32, outer oil cylinder intercommunicating pore 24, the conduit 8 of damping oil cylinder intercommunicating pore 23, damping adjustment sleeve 3, and the one-way valve 14 through oil return oil cylinder 13 rear ends flows into oil return oil cylinder 13 from outer oil cylinder 1; When forcing in propelling piston pull bar 11 with piston 10; Hydraulic oil in the oil return oil cylinder 13 flows into damping oil cylinder 12 through the one-way valve 14 at piston 10 places, oil cylinder 1 outside bottom outlet 31, adjustment hole 32, outer oil cylinder intercommunicating pore 24, the conduit 8 of damping oil cylinder intercommunicating pore 23, damping adjustment sleeve 3 flow into; When back seal ring 16 when the hydraulic oil seepage occurring and since preceding seal ring 15 stop and relief hole 21 can in time be back to outer oil cylinder 1 with preceding seal ring 15 and hydraulic oil between the back seal ring 16, make outside hydraulic oil is difficult for leaking out; Screw out bleed screw exhaust easily.
It is apparent to one skilled in the art that the present invention can change into multiple mode, and such change is not thought and departed from the scope of the present invention.The conspicuous modification of the technician to said field that all are such is within the scope that is included in this claim.
Claims (8)
1. power value adjustable hydraulic damper comprises damper regulation mechanism, inner cylinder and outer oil cylinder and is arranged on the piston in the inner cylinder and passes the piston pulling rod of front cover; Piston pulling rod is provided with radial direction seal ring; Piston is separated into damping oil cylinder and oil return oil cylinder with inner cylinder, and is provided with the one-way valve with the guiding of the hydraulic oil in oil return oil cylinder damping oil cylinder, and outer oil cylinder is with the one-way valve that also is provided with between the oil return oil cylinder the guiding of the hydraulic oil in outer oil cylinder oil return oil cylinder; It is characterized in that: seal ring and back seal ring before described radial direction seal ring comprises; Described front cover is provided with relief hole; One end of relief hole is between preceding seal ring and back seal ring, and the other end of relief hole is communicated with outer oil cylinder.
2. power value adjustable hydraulic damper according to claim 1, it is characterized in that: described damper regulation mechanism comprises damping adjustment sleeve and driving mechanism; The damping adjustment sleeve is positioned at aperture and the damping adjustment sleeve external diameter installation holes for matching that the front cover periphery is provided with, and the bottom surface of mounting hole is provided with the damping oil cylinder intercommunicating pore that is communicated with damping oil cylinder, and the sidewall of mounting hole is provided with the outer oil cylinder intercommunicating pore that is communicated with outer oil cylinder; Driving mechanism is fixedly connected with the damping adjustment sleeve.
3. power value adjustable hydraulic damper according to claim 2; It is characterized in that: described damping adjustment sleeve bottom surface is provided with and is used for the bottom outlet that is communicated with the damping oil cylinder intercommunicating pore, and the periphery of damping adjustment sleeve is provided with the adjustment hole that is communicated with bottom outlet with outer oil cylinder intercommunicating pore respective heights place.
4. power value adjustable hydraulic damper according to claim 2, it is characterized in that: the end face of described damping adjustment sleeve is provided with connection handle; Described driving mechanism comprises knob, stage clip and lock balls; The bottom surface of knob be provided with several along circle distribution and with the lock balls hole of lock balls coupling; Stage clip is positioned at the compression spring hole that the front cover periphery is provided with, and lock balls is pushed down in the lock balls hole, and lock balls is pushed down stage clip, and knob is fixedly connected with connection handle.
5. according to claim 1 or 2 or 3 or 4 described power value adjustable hydraulic dampers, it is characterized in that: described front cover is provided with exhaust port and bleed screw; One end of exhaust port is positioned at the outer surface of front cover, and the other end of exhaust port is communicated with relief hole, and bleed screw is threaded with exhaust port.
6. according to claim 1 or 2 or 3 or 4 described power value adjustable hydraulic dampers; It is characterized in that: be provided with conduit in the described outer oil cylinder; One end of conduit is communicated with outer oil cylinder intercommunicating pore and is fixedly connected with the front cover end face, and the other end of conduit is positioned at the opposite side of relief hole place, outer oil cylinder rear portion side.
7. power value adjustable hydraulic damper according to claim 1 and 2 is characterized in that: described power value adjustable hydraulic damper is provided with protecting jacket, and protecting jacket is enclosed within outside the piston pulling rod and with front cover and is fixedly connected.
8. according to claim 1 or 2 or 3 or 4 described power value adjustable hydraulic dampers, it is characterized in that: the head of described piston pulling rod is provided with the draw ring buffer stopper inboard with being positioned at draw ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110280252.0A CN102367857B (en) | 2011-09-20 | 2011-09-20 | Adjustable force type hydraulic damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110280252.0A CN102367857B (en) | 2011-09-20 | 2011-09-20 | Adjustable force type hydraulic damper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102367857A true CN102367857A (en) | 2012-03-07 |
| CN102367857B CN102367857B (en) | 2013-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110280252.0A Expired - Fee Related CN102367857B (en) | 2011-09-20 | 2011-09-20 | Adjustable force type hydraulic damper |
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| Country | Link |
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| CN (1) | CN102367857B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734369A (en) * | 2012-07-20 | 2012-10-17 | 詹高峰 | Hydraulic type damper |
| CN102777530A (en) * | 2012-07-31 | 2012-11-14 | 常州气弹簧有限公司 | Stepless speed-governing gas spring |
| CN105221637A (en) * | 2015-09-30 | 2016-01-06 | 福建明佳机械科技股份有限公司 | Bidirectional damper adjustable damper |
| CN108194452A (en) * | 2018-02-28 | 2018-06-22 | 浙江正星健身器有限公司 | A kind of two-way cylinder of fitness equipment |
| CN111894935A (en) * | 2020-06-30 | 2020-11-06 | 河海大学常州校区 | Hydraulic cylinder with external leakage service-proof function |
| CN111895026A (en) * | 2020-06-30 | 2020-11-06 | 河海大学常州校区 | Hydraulic damper with external leakage service prevention function |
| CN111895025A (en) * | 2020-06-30 | 2020-11-06 | 河海大学常州校区 | Hydraulic damper with external leakage service prevention function |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4800994A (en) * | 1983-09-20 | 1989-01-31 | Tokico Ltd. | Hydraulic damper of adjustable damping force type |
| CN2283149Y (en) * | 1997-02-28 | 1998-06-03 | 乐清市巨星有限公司 | Adjustable hydraulic damper |
| CN201636259U (en) * | 2010-01-29 | 2010-11-17 | 宁波亚德客自动化工业有限公司 | Adjustable hydraulic damper |
| CN202251618U (en) * | 2011-09-20 | 2012-05-30 | 宁波一力减震器有限公司 | Hydraulic damper with adjustable force value |
-
2011
- 2011-09-20 CN CN201110280252.0A patent/CN102367857B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4800994A (en) * | 1983-09-20 | 1989-01-31 | Tokico Ltd. | Hydraulic damper of adjustable damping force type |
| CN2283149Y (en) * | 1997-02-28 | 1998-06-03 | 乐清市巨星有限公司 | Adjustable hydraulic damper |
| CN201636259U (en) * | 2010-01-29 | 2010-11-17 | 宁波亚德客自动化工业有限公司 | Adjustable hydraulic damper |
| CN202251618U (en) * | 2011-09-20 | 2012-05-30 | 宁波一力减震器有限公司 | Hydraulic damper with adjustable force value |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734369A (en) * | 2012-07-20 | 2012-10-17 | 詹高峰 | Hydraulic type damper |
| CN102734369B (en) * | 2012-07-20 | 2014-06-04 | 詹高峰 | Hydraulic type damper |
| CN102777530A (en) * | 2012-07-31 | 2012-11-14 | 常州气弹簧有限公司 | Stepless speed-governing gas spring |
| CN102777530B (en) * | 2012-07-31 | 2015-02-04 | 常州气弹簧有限公司 | Stepless speed-governing gas spring |
| CN105221637A (en) * | 2015-09-30 | 2016-01-06 | 福建明佳机械科技股份有限公司 | Bidirectional damper adjustable damper |
| CN108194452A (en) * | 2018-02-28 | 2018-06-22 | 浙江正星健身器有限公司 | A kind of two-way cylinder of fitness equipment |
| CN108194452B (en) * | 2018-02-28 | 2024-07-02 | 浙江正星健身器有限公司 | Bidirectional oil cylinder for body-building device |
| CN111894935A (en) * | 2020-06-30 | 2020-11-06 | 河海大学常州校区 | Hydraulic cylinder with external leakage service-proof function |
| CN111895026A (en) * | 2020-06-30 | 2020-11-06 | 河海大学常州校区 | Hydraulic damper with external leakage service prevention function |
| CN111895025A (en) * | 2020-06-30 | 2020-11-06 | 河海大学常州校区 | Hydraulic damper with external leakage service prevention function |
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| Publication number | Publication date |
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| CN102367857B (en) | 2013-07-24 |
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Address after: No. 57, Dagang Sixth Road, Beilun District, Ningbo City, Zhejiang Province, 315800 Patentee after: Ningbo Yili Industrial Co.,Ltd. Address before: No. 57, Dagang Sixth Road, Beilun District, Ningbo City, Zhejiang Province, 315800 Patentee before: NINGBO YILI SHOCK ABSORBER Co.,Ltd. |
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Granted publication date: 20130724 |