CN1031900C - Hydraulically controlled pneumatic elastic jackstay - Google Patents
Hydraulically controlled pneumatic elastic jackstay Download PDFInfo
- Publication number
- CN1031900C CN1031900C CN 93110703 CN93110703A CN1031900C CN 1031900 C CN1031900 C CN 1031900C CN 93110703 CN93110703 CN 93110703 CN 93110703 A CN93110703 A CN 93110703A CN 1031900 C CN1031900 C CN 1031900C
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- China
- Prior art keywords
- piston rod
- cylinder body
- wall
- piston
- hydraulically controlled
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- Expired - Fee Related
Links
- 238000013016 damping Methods 0.000 claims abstract description 31
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 210000004907 gland Anatomy 0.000 claims description 17
- 239000012530 fluid Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 8
- 239000004809 Teflon Substances 0.000 claims description 7
- 229920006362 Teflon® Polymers 0.000 claims description 7
- 210000004883 areola Anatomy 0.000 claims description 2
- 239000000969 carrier Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 10
- 239000011261 inert gas Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000037147 athletic performance Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Fluid-Damping Devices (AREA)
Abstract
The present invention relates to a pneumatic or liquid-control elastic supporting rod, wherein the rear half section of a cavity of a piston rod is slightly larger than the front half section of the cavity; a valve core shaft is arranged in the rear half section of the cavity; a main damping oil cavity is formed between the rear end surface of the valve core shaft and the front end surface of a piston at the rear of a cylinder body; a subsidiary damping oil cavity is formed between the outer wall of a section of the pipe body and the inner wall in the corresponding position of the cylinder body, and the section of the pipe body is between the large end of the tail of the piston rod and a sealing sleeve; the subsidiary damping oil cavity is communicated with a damping hole arranged on the large end of the tail of the piston rod when the valve core shaft is opened. The supporting rod of the present invention has strong elasticity, the speed is easy to control, and the supporting rod can be locked in any position of the motion stroke.
Description
The present invention relates to a kind of elastic jackstay, particularly a kind of pneumatic or hydraulic control elastic jackstay.
In industrial field,, when all need need fixedly by elastic force to the motion of relative two members at an arbitrary position, all elastic jackstay need be installed for each parts mechanism.Existing elastic jackstay, advanced both at home and abroad have aeroelasticity strut and a hydraulic control elastic jackstay (as U.S. Pat 3,947,006 and US4,832,318), though the former has elastic reaction preferably, movement velocity is too fast, and is wayward; Though the latter has the effect of comparatively ideal damping convergence rate, control easily, it does not have elasticity, uses not very convenient.In addition, also has a kind of more common hydraulically controlled pneumatic elastic jackstay at present, the tail-gate that is used for minibus more, though it has solved the deficiency separately of pneumatic or hydraulic control elastic jackstay, but it can only carry out the motion of the predetermined stroke of relative two members, and can not carry out the setting movement of arbitrary position in the total travel, its application is restricted greatly.
The somebody has applied for name being called the Chinese patent of air spring, and (patent No. is; 91208083.3), this air spring is made of the spanner of the cylindrical shell that oil and high pressure air are housed, valve type bucket, piston rod, valve bar, valve push rod, front head, rear head, lip rubber ring and promotion valve push rod.But the cut-out oil circuit device that the valve bar of this air spring, piston and valve gap form obviously can not play the desirable tight closing oil path that contacts, because valve bar and valve gap are two independently members, the structure of many links is with regard to the gap of many leakages, when the valve bar is inserted in valve gap, gapped between them, easily produce oil circuit and leak,, can produce the gap of its elasticity excursion≤0.5mm so can not produce the deadend form.As long as and have a bit gap, the high-voltage oil liquid in cylindrical shell two chambeies to leak, make that air spring can not at that time position of locking, it is mobile gradually that cylindrical shell and piston rod are produced.Simultaneously, the valve gap end face of this air spring and piston end surface are plane contact, produce the gap again inevitably, also can cause oil circuit to leak, and make air spring the not dead phenomenon of lock occur.In addition, what this air spring adopted is the lip rubber ring, the frictional force of lip rubber ring and piston rod is bigger in the time of then just will having moved in its static a period of time, the power of gas pressure on the oil gas separator of particularly working as plenum chamber, be delivered to fluid, when fluid acts on to the lip rubber seal circle again, then because fluid can produce very big hydraulic coupling, force the epipharynx of lip-type packing on the external diameter of piston rod, to increase bigger pressure, promptly increased frictional force,, the elastic force of pressurized gas has been hindered so the relative movement of piston rod and cylindrical shell is hindered, need outer power just can make piston rod and cylindrical shell produce relative movement, start ineffective.In addition, the oil gas separator hardness in the existing air spring is bigger, make its seal ring can not get protection, and the inner chamber of easy plucking cylindrical shell destroys sealability.And the hypothesis state that is injected to of the pressurized gas of this air spring, not injecting structure.
Purpose of the present invention is exactly in order to address the above problem, and provides a kind of and has good seal performance, friction factor is little and start the convenient and hydraulically controlled pneumatic elastic jackstay of positive lock at an arbitrary position of spirit.
Technical solution of the present invention;
A kind of hydraulically controlled pneumatic elastic jackstay, it includes strut cylinder body 3, the tail seal of cylinder body 3 is connected with tailstock 2, in cylinder body 3 rear portions, be provided with the piston 4 that cooperates with its sliding friction, be provided with piston rod 5 in the middle front part of cylinder body 3, and its head passes the front port of cylinder body 3, be provided with stuffing box gland 9 between the anterior outer wall of piston rod 5 and cylinder body 3 front inner wall, make piston rod 5 cooperate for sliding friction with stuffing box gland 9, stuffing box gland 9 and cylinder body 3 inwalls are for being fixed with sealing, be provided with push rod 8 in preceding half section of piston rod 5, leave certain interval between push rod 8 and the piston rod 5, be provided with seal ring 18 in the big end outer wall of the piston rod 5 afterbodys seal groove, it is cooperated with cylinder body 3 inwall sliding frictions, the second half section cavity diameter of piston rod 5 is slightly larger than the diameter of its preceding half section cavity, before the big round end of push rod 8 tail ends just in time is positioned at piston rod 5, on the second half section big areola junction step, in the second half section of piston rod 5 cavity, be provided with poppet shaft 7, form main damping oil pocket 24 between the front-end face of poppet shaft 7 ear end faces and cylinder body 3 rear portion inner carriers 4, piston rod 5 between the inwall of the outer wall of one section body between big end of its afterbody and the stuffing box gland 9 and cylinder body 3 relevant positions, form auxilliary damping oil pocket 23, auxilliary damping oil pocket 23 is connected by the damping hole 6 on the big end of piston rod 5 afterbodys when poppet shaft 7 is opened, the rear end that it is characterized in that described valve core axle 7 is an inverted cone, it with piston rod 5 rear ends in positive cone shape hole closely contact, to lead, auxilliary damping oil pocket 24, oil circuit between 23 disconnects, and guarantees that piston rod 5 is locked in the position of instant cut-out oil circuit; Be provided with guide sleeve 11 between the front port inwall in cylinder body 3 and the anterior outer wall of piston rod 5, be surrounded by the guiding lining of making by the teflon macromolecular material 10 in the guide sleeve 11, the front end that the rear portion of guide sleeve 11 and guiding lining 10 thereof is against stuffing box gland 9 is equipped with O RunddichtringO 12,14 in the seal groove of stuffing box gland 9 inwalls.
The present invention had both solved the too fast and uppity shortcoming of aeroelasticity strut movement velocity, had also solved the logy shortcoming of hydraulic control elastic jackstay, the problem that has also solved the gap of the flexible excursion of existing air spring and be difficult for starting.No matter device of the present invention is installed in any direction with on the position can both guarantee that active part has lubricated fully and sensitivity, and good seal performance can be locked on the movement travel arbitrary position, realizes reliable stepless positioning, and application area improves greatly.Piston among the present invention is owing to be the teflon macromolecular material in addition, so it has very little friction factor, and hardness so can increase the service life greatly, can not occur the phenomenon of plucking cylindrical shell less than the cylinder body hardness of metal materials.Novel structure of the present invention, with low cost, processing technology is simply complete, and reliable performance is easy to use, can be widely used on automotive seat and the top-grade furniture swivel chair, also can be used on the sick bed and the locking parts in the industry in the hospital.
Fig. 1 is a structural representation of the present invention.
As Fig. 1, fill with damping oil in auxilliary damping oil pocket 23 of apparatus of the present invention and the main damping oil pocket 24, the cylinder chamber 25 of one-way valve in cylinder body 3 from tailstock 2 is full of the inert gas that certain pressure is arranged, be with stuffing box gland 21 on the one-way valve, it is used for preventing that inert gas from running out of, tailstock 2 is sealedly and fixedly connected by sealing Figure 22 and cylinder body 3, charge gas after, with sealing rivet 1 one-way valve is shut.After inert gas is full of, piston 4 is forced to compress forward the fluid in the main damping oil pocket 24, poppet shaft 7 rear ends are closely contacted with piston rod 5 afterbody ports, oil circuit between the main and auxiliary damping oil pocket 24,23 is disconnected, because the incompressible principle of fluid, make piston rod 5 be locked at that time position.When need piston rod 5 moves up, be pressed on the depression bar 26 on push rod 8 front ends earlier down, push rod 8 is moved backward, it makes poppet shaft 7 move backward again.Poppet shaft 7 rear portions corresponding to one section column diameter of piston rod 5 rear end inner wall positions slightly more carefully, form big gap between its this section cylinder outer wall and the piston rod 5 rear end inwalls, passage as main and auxiliary damping oil pocket 24,23, damping hole 6 one ends on the big end of piston rod 5 afterbodys are communicated with auxilliary damping oil pocket 23, and the big gap between the other end and poppet shaft 7 rear portions and piston rod 5 rear ends is communicated with.Like this when poppet shaft 7 is mobile backward, big gap between its rear portion and piston rod 5 rear ends is communicated with main damping oil pocket 24, this moment, main damping oil pocket 24 interior fluid were because the pressure effect of the inert gas in the cylinder chamber 25 forces piston rod 5 and interior push rod 8 and poppet shaft 7 thereof together to move up, this moment, piston 4 also moved up, cylinder chamber 25 volumes are increased, the volume that it increases equals the volume that piston rod 5 shifts out cylinder body 3 parts, thereby finish vertical motion, as long as depression bar 26 do not unclamp, when the big end of afterbody that piston rod 5 and push rod 8 thereof and poppet shaft 7 rise to piston rod 5 always arrives to stuffing box gland 9 till.When the arbitrary position of piston rod 5 uphill process, as long as unclamp depression bar 26, fluid in the main damping oil pocket 24 forces poppet shaft 7 and push rod 8 to move up again, make the rear end of valve core axle 7 cut off oil circuit between the main and auxiliary damping oil pocket 24,23, then piston rod 5 stops on arbitrary position when unclamping depression bar 26, finishes the action that the arbitrary position liter stops.The present invention respectively has a seal groove at the middle part and the anterior outer wall of poppet shaft 7, and their inside is equipped with seal ring 17 and 16 respectively, makes to cooperate for sliding friction between poppet shaft 7 and the piston rod 5.On piston 4 outer walls, have the two seals groove, seal ring 19,20 all is equipped with in their inside, to guarantee that gas and fluid form excellent sealing, and piston 4 preferably adopts the teflon macromolecular material to make, it itself can form distortion under the high-voltage oil liquid of high-pressure inert gas and formation, form good sealing effect, and the strictness of gas and fluid is separated, in case because gas is run into cylinder body 3 tensioner piston rods 5 are slided, lose athletic performance.And the teflon macromolecular material of piston 4 has very little friction factor, and material is soft, and hardness there is not wearing and tearing to cylinder body 3 internal surfaces, so can increase the service life greatly less than cylinder body 3 hardness of metal materials when work.Be provided with guide sleeve 11 between the front port inwall in cylinder body 3 and the anterior outer wall of piston rod 5, be surrounded by the guiding lining of being made by the teflon macromolecular material 10 in the guide sleeve 11, the rear portion of guide sleeve 11 and guiding lining 10 is against the front end of stuffing box gland 9.Straight up, do not depart from when guide sleeve 11 and guiding lining 10 are used for guaranteeing piston rod 5 risings, because guiding lining 10 adopts soft high-abrasive material to make, it is the surface of worn piston bar 5 not, the assurance operating accuracy.The place is set with sealing Figure 15 on push rod 8 tail end great circle caster bed rank, and seal ring 12,13,14 is housed in the seal groove of stuffing box gland 9 inside and outside walls, and they all are used for sealing, and prevent that fluid from spilling.
When piston rod 5 all stretches out need reset the time, should descend moulded rod 26, the pressure of the power when ejecting for simultaneously one of piston rod 5 front end greater than it forces piston rod 5 and push rod 8 thereof and poppet shaft 7 to reset, and this moment, piston 4 also moved down into initial position.
Among the present invention, the pressed gas of storage can inject the inert gas of different pressures, the also corresponding change of the top power to piston rod 5 that is produced according to different needs in the cylinder chamber 25.The rate of climb of piston rod 5 is decided by the aperture of damping hole 6, reaches required movement velocity.
Claims (7)
1, a kind of hydraulically controlled pneumatic elastic jackstay, it includes strut cylinder body 3, the tail seal of cylinder body 3 is connected with tailstock 2, in cylinder body 3 rear portions, be provided with the piston 4 that cooperates with its sliding friction, be provided with piston rod 5 in the middle front part of cylinder body 3, and its head passes the front port of cylinder body 3, be provided with stuffing box gland 9 between the anterior outer wall of piston rod 5 and cylinder body 3 front inner wall, make piston rod 5 cooperate for sliding friction with stuffing box gland 9, stuffing box gland 9 and cylinder body 3 inwalls are for being fixed with sealing, be provided with push rod 8 in preceding half section of piston rod 5, leave certain interval between push rod 8 and the piston rod 5, be provided with seal ring 18 in the big end outer wall of the piston rod 5 afterbodys seal groove, it is cooperated with cylinder body 3 inwall sliding frictions, the second half section cavity diameter of piston rod 5 is slightly larger than the diameter of its preceding half section cavity, before the big round end of push rod 8 tail ends just in time is positioned at piston rod 5, on the second half section big areola junction step, in the second half section of piston rod 5 cavity, be provided with poppet shaft 7, form main damping oil pocket 24 between the front-end face of poppet shaft 7 ear end faces and cylinder body 3 rear portion inner carriers 4, piston rod 5 between the inwall of the outer wall of one section body between big end of its afterbody and the stuffing box gland 9 and cylinder body 3 relevant positions, form auxilliary damping oil pocket 23, auxilliary damping oil pocket 23 is connected by the damping hole 6 on the big end of piston rod 5 afterbodys when poppet shaft 7 is opened, the rear end that it is characterized in that described valve core axle 7 is an inverted cone, it with piston rod 5 rear ends in positive cone shape hole closely contact, to lead, auxilliary damping oil pocket 24, oil circuit between 23 disconnects, and guarantees that piston rod 5 is locked in the position of instant cut-out oil circuit; Be provided with guide sleeve 11 between the front port inwall in cylinder body 3 and the anterior outer wall of piston rod 5, be surrounded by the guiding lining of making by the teflon macromolecular material 10 in the guide sleeve 11, the front end that the rear portion of guide sleeve 11 and guiding lining 10 thereof is against stuffing box gland 9 is equipped with O RunddichtringO 12,14 in the seal groove of stuffing box gland 9 inwalls.
2, by the described hydraulically controlled pneumatic elastic jackstay of claim 1, it is characterized in that poppet shaft 7 rear portions corresponding to one section column diameter of piston rod 5 rear end inner wall positions slightly more carefully, its this section cylinder outer wall and form big gap when living through between the bar 5 rear end inwalls, passage as main and auxiliary damping oil pocket 24,23, damping hole 6 one ends on the big end of piston rod 5 afterbodys are communicated with auxilliary damping oil pocket 23, and the big gap between the other end and poppet shaft 7 rear portions and piston rod 5 rear ends is communicated with.
3, by claim 1 or 2 described hydraulically controlled pneumatic elastic jackstays, it is characterized in that poppet shaft 7 middle parts and anterior outer wall respectively have a seal groove, their inside is equipped with seal ring 17 and 16 respectively, makes to cooperate for sliding friction between poppet shaft 7 and the piston rod 5.
4, by the described hydraulically controlled pneumatic elastic jackstay of claim 1, it is characterized in that having the two seals groove on piston 4 outer walls in cylinder body 3 rear portions, sealing Figure 19,20 all is equipped with in their inside, form excellent sealing with assurance gas and fluid, and piston 4 adopts preferably the teflon macromolecular material to make.
5,, it is characterized in that being set with seal ring 15, to increase sealing at place, push rod 8 tail end great circle caster bed rank by the described hydraulically controlled pneumatic elastic jackstay of claim 1.
6, by the described hydraulically controlled pneumatic elastic jackstay of claim 1, it is characterized in that being provided with depression bar 26 at the front end of push rod 8.
7, by the described hydraulically controlled pneumatic elastic jackstay of claim 1, it is characterized in that being with stuffing box gland 21 on the one-way valve of tailstock 2, tailstock 2 is sealedly and fixedly connected by seal ring 22 and cylinder body 3, and with sealing rivet 1 one-way valve is shut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93110703 CN1031900C (en) | 1993-03-06 | 1993-03-06 | Hydraulically controlled pneumatic elastic jackstay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93110703 CN1031900C (en) | 1993-03-06 | 1993-03-06 | Hydraulically controlled pneumatic elastic jackstay |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1082153A CN1082153A (en) | 1994-02-16 |
| CN1031900C true CN1031900C (en) | 1996-05-29 |
Family
ID=4988539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93110703 Expired - Fee Related CN1031900C (en) | 1993-03-06 | 1993-03-06 | Hydraulically controlled pneumatic elastic jackstay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1031900C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105387116A (en) * | 2015-12-21 | 2016-03-09 | 常州市莱特气弹簧有限公司 | Full-rigid air spring capable of being locked in any position |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9662951B1 (en) * | 2016-01-06 | 2017-05-30 | Caterpillar Inc. | Truck strut fail-safe |
| CN106122341B (en) * | 2016-05-26 | 2019-01-01 | 庆安集团有限公司 | A kind of gas spring of unidirectional damping type |
| CN107339360B (en) * | 2017-09-08 | 2018-11-30 | 中航飞机起落架有限责任公司 | A kind of undercarriage buffer |
| CN110630668A (en) * | 2019-10-08 | 2019-12-31 | 浙江雨辰机械有限公司 | Air spring hovering locking structure |
-
1993
- 1993-03-06 CN CN 93110703 patent/CN1031900C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105387116A (en) * | 2015-12-21 | 2016-03-09 | 常州市莱特气弹簧有限公司 | Full-rigid air spring capable of being locked in any position |
| CN105387116B (en) * | 2015-12-21 | 2017-02-22 | 常州市莱特气弹簧有限公司 | Full-rigid air spring capable of being locked in any position |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1082153A (en) | 1994-02-16 |
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| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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