CN112211944A - Strut type anti-side-tipping shock absorber assembly - Google Patents
Strut type anti-side-tipping shock absorber assembly Download PDFInfo
- Publication number
- CN112211944A CN112211944A CN202011282999.5A CN202011282999A CN112211944A CN 112211944 A CN112211944 A CN 112211944A CN 202011282999 A CN202011282999 A CN 202011282999A CN 112211944 A CN112211944 A CN 112211944A
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- China
- Prior art keywords
- piston rod
- shock absorber
- cylinder
- sleeved
- ball head
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
- F16F13/005—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a wound spring and a damper, e.g. a friction damper
- F16F13/007—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a wound spring and a damper, e.g. a friction damper the damper being a fluid damper
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/062—Bi-tubular units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
- F16F9/512—Means responsive to load action, i.e. static load on the damper or dynamic fluid pressure changes in the damper, e.g. due to changes in velocity
- F16F9/5123—Means responsive to load action, i.e. static load on the damper or dynamic fluid pressure changes in the damper, e.g. due to changes in velocity responsive to the static or steady-state load on the damper
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/54—Arrangements for attachment
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses a strut type anti-roll shock absorber assembly, which comprises a cylinder barrel, wherein a piston rod is inserted in the cylinder barrel, the piston rod can feed back and forth relative to the cylinder barrel, a rear spring pad is fixed on the cylinder barrel, a front spring pad is sleeved on the piston rod, an assembly spring is clamped between the front spring pad and the rear spring pad, a high-pressure oil-gas cylinder is arranged on the side part of the cylinder barrel in parallel, a working chamber is formed in the hollow inner wall of the cylinder barrel, a regulating chamber is formed in the high-pressure oil-gas cylinder, the regulating chamber is communicated with the working chamber, a partition plate is arranged in the cylinder barrel, an isolation block is connected below the partition plate, an oil inlet chamber and an oil return chamber are enclosed by the partition plate and the isolation block, the oil inlet chamber and the oil return chamber are communicated with the regulating chamber, high-pressure air chambers are formed at the front end and the rear end of the regulating chamber, and nitrogen, and a valve rod is arranged in the adjusting cavity, and two floating pistons are sleeved at two ends of the valve rod.
Description
Technical Field
The invention relates to the technical field of shock absorbers, in particular to a strut type anti-side-tipping shock absorber assembly.
Background
In the prior art, once the shock absorber assembly has a side-tipping phenomenon due to a pothole on the road surface during the running of a vehicle, the instantaneous impact force applied to the shock absorber is rapidly increased, so that the shock absorber spring is easily compressed to exceed an extreme value, thereby causing shock absorption failure, in the Chinese utility model with the patent number of CN201320132499.2, the shock absorber assembly comprises a shock absorber, a front fork tube assembly, a rocker arm and a balance arm, wherein the front fork tube assembly is formed by welding two front fork tubes by a cross arm, the shock absorber comprises a hydraulic damper and a variable-pitch cylindrical spiral spring, each front fork tube is correspondingly connected with the shock absorber, the rocker arm and the balance arm, the shock absorber and the front fork tube are separated, the upper end of the shock absorber is connected with the front fork tube, the lower end of the shock absorber is connected with the middle of the rocker arm, one end of the rocker arm is connected with the lower end of the front fork tube, the balance arm and the rocker arm are combined and connected into a whole through a, the invention has the advantages that the rotating shaft sleeve is arranged outside the rotating shaft, one end of the balance arm is connected with the front fork tube, and the other end of the balance arm is connected with the rocker arm.
However, the balance arm provided in the above patent, although it can play a roll-proof role, because it is additionally provided with balance arms for increasing damping at two sides of the shock absorber, the occupied volume of the shock absorber can be greatly increased, in addition, the balance arm interacts with the shock absorber body through the rocker arm, namely the balance arm is circumferentially positioned through the rocker arm and then locked, which makes the firmness of the balance arm insufficient, and the balance arm is easy to loose in a bumping environment for a long time, resulting in the failure of the roll-proof function, and after receiving roll impact, the balance arm can only recover by the elasticity of itself, because the balance arm is exposed outside the shock absorber, and the environment of the vehicle chassis where the shock absorber is located is relatively bad, sand and dust on the road surface are easy to accumulate in the gap of the balance arm, causing the blocking of the reset of the balance arm.
Disclosure of Invention
The invention aims to solve the technical problem of providing a strut-type anti-roll shock absorber assembly which has low noise and wear resistance and can effectively prevent shock absorption failure caused by roll in view of the technical current situation.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an anti bumper shock absorber assembly that heels of strut type, includes the cylinder, the piston rod has been pegged graft in the cylinder, the piston rod can for the reciprocal feeding of cylinder, be fixed back spring pad on the cylinder, the cover is equipped with preceding spring pad on the piston rod, the centre gripping has assembly spring between preceding spring pad and the back spring pad the cylinder lateral part is parallelly connected and is provided with a high-pressure oil gas cylinder, cylinder inner wall cavity is formed with the working chamber, be formed with in the high-pressure oil gas cylinder and adjust the chamber, adjust the chamber with the working chamber intercommunication be provided with the baffle in the cylinder, the spacing block is being connected to the baffle below, the baffle with the inner wall of cylinder is parallel, the spacing block is connected perpendicularly in the below of baffle, by the baffle with the spacing block encloses into oil feed chamber and oil return chamber, oil feed chamber and oil return chamber with adjust the chamber intercommunication, the utility model discloses a valve rod of adjusting, including adjusting chamber, valve rod both ends cover, the valve rod is equipped with two floating piston, floating piston can follow the valve rod slides, by floating piston will high-pressure air chamber seals.
Preferably, two pistons are sleeved on the valve rod, and the two pistons are positioned between the two floating pistons.
As an improvement of the invention, an auxiliary spring is sleeved on the piston rod, an annular mounting plate is arranged on the side wall of the front end of the cylinder barrel, the rear end of the auxiliary spring is connected to the annular mounting plate, the front end of the auxiliary spring abuts against a front spring pad, and the front spring pad can move along with the piston rod.
As a further improvement of the invention, a crash pad block is sleeved on the piston rod, a gap is formed between the auxiliary spring and the outer wall of the piston rod, the crash pad block is positioned in the gap, the front end of the auxiliary spring is formed into a tip, the diameter of the crash pad block is larger than that of the tip, and the crash pad block can limit the front end of the auxiliary spring.
As a specific technical scheme of the invention, the front end of the piston rod is sleeved with the top rubber, and the top rubber is detachably fixed at the front end of the piston rod through a bolt.
As an improvement of the invention, a ball head mounting part is sleeved at the front end of the piston rod, a hydraulic cavity is formed in the ball head mounting part, a sealing element is sleeved on the side wall of the front end of the piston rod, the hydraulic cavity is sealed through the sealing element, the rear end of the ball head mounting part is connected with the front spring pad, the front end of the piston rod is sleeved with an installation frame, an installation space is formed between the ball head installation part and the installation frame, the top rubber is filled in the installation space, the front end of the ball head mounting part is sleeved with a sealing cover, the sealing cover seals the mounting space and limits the top rubber in the mounting space, the mounting rack is provided with an arc part, the radian of the arc part is matched with the radian of the ball head mounting part, and lubricating grease is coated on the outer wall of the ball head mounting part, and lubricating grease is also coated on the inner wall of the arc-shaped part.
As a further improvement of the invention, the ball head mounting part is in threaded connection with the arc-shaped part.
As a further improvement of the invention, the rear end of the ball head mounting part is integrally formed with the front spring pad.
Compared with the prior art, the invention has the advantages that: the high-pressure oil gas cylinder is connected with the side of the cylinder in parallel, high-pressure nitrogen is filled at two ends of the high-pressure oil gas cylinder, an adjusting cavity is formed in the middle of the high-pressure oil gas cylinder, the shock absorber is under a normal working condition, the internal damping liquid cannot enter the high-pressure oil gas cylinder to obtain throttling damping, when a vehicle runs on a hollow road section and is inclined in a large range, the piston rod is compressed towards the rear part of the cylinder due to the fact that the instantaneous compression force received by the shock absorber is increased, the size of the internal working cavity of the shock absorber is reduced, part of the damping liquid is pressed into the high-pressure oil gas cylinder through the oil inlet cavity, secondary throttling is carried out through the piston and the valve plate inside the high-pressure oil gas cylinder, large damping force is generated to resist the vehicle to incline, and after the vehicle returns to normally run, the damping liquid in. In addition, the front end of the piston rod is provided with the ball head mounting part, the ball head mounting part is rotatably inserted into the mounting frame, a hydraulic cavity is formed between the ball head mounting part and the front end of the piston rod, hydraulic oil is filled in the hydraulic cavity, the arrangement of the hydraulic oil can enable the piston rod to reduce abrasion between the piston rod and the mounting frame in the reciprocating feeding process, the piston rod is prevented from colliding with the mounting frame to generate clicking noise, and the NVH feeling of a vehicle is improved.
Drawings
FIG. 1 is a schematic structural view of a strut-type anti-roll shock absorber assembly according to an embodiment of the present invention;
fig. 2 is a schematic structural view of the front end of the piston rod in fig. 1.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in the attached drawings, the embodiment is a strut-type anti-roll shock absorber assembly, which comprises a cylinder barrel 1, a working chamber is formed in the cylinder barrel in a hollow manner, liquid damping liquid is filled in the working chamber, a piston rod 2 is inserted in the cylinder barrel, the rear end of the piston rod is located in the working chamber, the front end of the piston rod penetrates through a dustproof end cover 3 at the front end of the cylinder barrel and extends outwards, correspondingly, a through hole capable of accommodating the piston rod is formed in the dustproof end cover, a sealing mechanism such as a sealing ring is arranged on the hole wall of the through hole, the front end of the piston rod is connected with a mounting frame 5 through a top rubber 4, and the top rubber is detachably fixed at the front end of the piston rod through a.
The mounting bracket is fixed on vehicle chassis, receives when jolting and produce the vibration when the vehicle, vehicle chassis can pass through the mounting bracket with the impact force that the vibration produced and transmit for the piston rod pressurized rearward movement, at the in-process of piston rod rearward axial displacement, damping fluid in the working chamber forms the resistance to the rearward movement of piston rod, digests the impact force that the vibration produced gradually, plays the cushioning effect from this.
Meanwhile, a front spring pad 6 is sleeved on the piston rod, a rear spring pad 7 is fixed on the cylinder barrel, the front spring pad can stretch together with the piston rod, the rear spring pad is fixed on the cylinder barrel and does not move all the time, an assembly spring 8 is clamped between the front spring pad and the rear spring pad, a gap is formed between the assembly spring and the outer wall of the piston rod, an auxiliary spring 9 is further arranged in the gap, an annular mounting plate 10 is arranged on the side wall of the front end of the cylinder barrel, the rear end of the auxiliary spring is connected to the annular mounting plate, the front end of the auxiliary spring abuts against the front spring pad, and the front spring pad can move together with the piston rod. Through setting up assembly spring and auxiliary spring, can be on the one hand at the in-process that the piston rod pressurized backward moved, provide the resistance by assembly spring and auxiliary spring and carry out the damping, on the other hand after external vibration source disappears, can utilize assembly spring and auxiliary spring's self restoring force to drive the piston rod and reset.
In order to prevent the shock absorber from being damaged due to the fact that a vehicle inclines to cause the shock absorber to be damaged, a high-pressure oil-gas cylinder 11 is arranged on the side portion of a cylinder barrel in parallel, an adjusting cavity 12 is formed in the high-pressure oil-gas cylinder in a hollow mode, high-pressure gas chambers 13 are formed in the front end and the rear end of the adjusting cavity respectively, argon gas is filled in the high-pressure gas chambers, high air pressure is achieved, a valve rod 14 is arranged in the adjusting cavity, the valve rod and the cylinder barrel are arranged in the same axial direction, namely the valve rod is in a horizontal state, two ends of the valve rod are respectively sleeved with a floating piston 15, the floating piston can slide along the valve rod, the high-pressure gas chambers are sealed through the floating pistons, when the vehicle inclines in the driving process, instant impact force borne by the shock absorber is violently increased, damping liquid is rapidly pressed into the adjusting, the floating piston moves towards the direction of the high-pressure air chamber until the air pressure in the high-pressure air chamber is equal to the hydraulic pressure in the adjusting cavity, at the moment, the floating piston stops moving, then, after an impact source disappears, the piston rod resets under the action of the assembly spring and the auxiliary spring, the volume of the working cavity in the cylinder barrel is increased, the damping liquid flows back to the working cavity again, so that the hydraulic pressure of the adjusting cavity is reduced and is smaller than the air pressure of the high-pressure air chamber, and the floating piston resets under the action of the air pressure of the high-pressure air chamber.
In order to further consume the impact force of the damping liquid, two pistons 16 are further sleeved on the valve rod and are positioned between the two floating pistons, and after the damping liquid enters the adjusting cavity, the two pistons can be pushed to move towards the two ends of the valve rod simultaneously, so that the impact kinetic energy of the damping liquid can be consumed in the process.
In order to guide the damping fluid entering the adjusting cavity, a partition plate 18 is arranged in the cylinder barrel, an isolation block 19 is connected below the partition plate, the partition plate is parallel to the inner wall of the cylinder barrel, the isolation block is vertically connected below the partition plate, an oil inlet cavity 20 and an oil return cavity 21 are enclosed by the partition plate and the isolation block, and the oil inlet cavity and the oil return cavity are communicated with the adjusting cavity.
The piston rod is sleeved with an anti-collision cushion block 17, a gap is formed between the auxiliary spring and the outer wall of the piston rod, the anti-collision cushion block is located in the gap, the front end of the auxiliary spring is formed to be a tip end, the diameter of the anti-collision cushion block is larger than that of the tip end, and the front end of the auxiliary spring can be limited by the anti-collision cushion block.
The front end cover of piston rod is equipped with bulb installation department 22, is formed with hydraulic pressure chamber 23 in the bulb installation department, has been full of hydraulic damping oil in the hydraulic pressure chamber, and hydraulic damping oil can carry out certain retardation to it at the in-process that the piston rod resets, prevents that it from taking place direct friction and collision production noise and wearing and tearing with the mounting bracket, in order to prevent that hydraulic damping oil from leaking outward the cover is equipped with sealing member 24 on the lateral wall of piston rod front end, and the sealing member is by the centre gripping between bulb installation department inner wall and piston rod outer wall, and the sealing member can be for O shape sealing washer.
The rear end of bulb installation department with preceding spring pad integrated into one piece the piston rod front end cover is equipped with mounting bracket 5, and the bumper shock absorber assembly is fixed on the vehicle through this mounting bracket the bulb installation department with be formed with installation space 25 between the mounting bracket, the apex is filled in the installation space the front end cover of bulb installation department is equipped with sealed lid 26, by sealed lid will installation space is sealed and will the apex spacing in the installation space, can also prevent that outside dust from entering into the installation space simultaneously. The arrangement of the top rubber can prevent the ball head mounting part from suddenly rotating in the mounting frame.
The mounting bracket is formed with arc 51, the radian of arc with the radian adaptation of bulb installation department scribble lubricating grease 52 on the bulb installation department outer wall, also scribble lubricating grease on the inner wall of arc. The bulb installation department with arc portion threaded connection, bulb installation department installs into this arc portion through rotatory ground mode.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the present invention will readily occur to those skilled in the art without departing from the spirit of the present invention.
Claims (8)
1. The utility model provides an anti bumper shock absorber assembly that heels of strut type, includes the cylinder the piston rod has been pegged graft in the cylinder, the piston rod can for the reciprocal feeding of cylinder be fixed back spring pad on the cylinder the cover is equipped with preceding spring pad on the piston rod preceding spring pad and back spring pad between the centre gripping have assembly spring, its characterized in that: a high-pressure oil-gas cylinder is arranged on the side part of the cylinder barrel in parallel, a working cavity is formed in the hollow inner wall of the cylinder barrel, an adjusting cavity is formed in the high-pressure oil-gas cylinder and communicated with the working cavity, a partition plate is arranged in the cylinder barrel, a separation block is connected below the partition plate, the partition plate is parallel to the inner wall of the cylinder barrel, the isolating block is vertically connected below the partition plate, an oil inlet cavity and an oil return cavity are enclosed by the partition plate and the isolating block, the oil inlet cavity and the oil return cavity are communicated with the adjusting cavity, high-pressure air chambers are formed at the front end and the rear end of the adjusting cavity, the high-pressure air chambers are filled with nitrogen, a valve rod is arranged in the adjusting cavity and positioned between the two high-pressure air chambers, two floating pistons are sleeved at two ends of the valve rod and can slide along the valve rod, and the high-pressure air chamber is sealed by the floating pistons.
2. The strut anti-roll shock absorber assembly according to claim 1, wherein: and two pistons are also sleeved on the valve rod and are positioned between the two floating pistons.
3. The strut anti-roll shock absorber assembly according to claim 1, wherein: still overlap on the piston rod and establish auxiliary spring, be provided with the annular mounting panel on the front end lateral wall of cylinder, auxiliary spring's rear end is connected on the annular mounting panel, auxiliary spring's front end supports and leans on preceding spring pad, preceding spring pad can move along with the piston rod.
4. The strut anti-roll shock absorber assembly according to claim 3, wherein: the piston rod is sleeved with an anti-collision cushion block, a gap is formed between the auxiliary spring and the outer wall of the piston rod, the anti-collision cushion block is located in the gap, the front end of the auxiliary spring is formed to be a tip, the diameter of the anti-collision cushion block is larger than that of the tip, and the front end of the auxiliary spring can be limited by the anti-collision cushion block.
5. The strut anti-roll shock absorber assembly according to claim 1, wherein: the front end of the piston rod is sleeved with top rubber, and the top rubber is detachably fixed at the front end of the piston rod through a bolt.
6. The strut anti-roll shock absorber assembly according to claim 5, wherein: a ball head mounting part is sleeved at the front end of the piston rod, a hydraulic cavity is formed in the ball head mounting part, a sealing element is sleeved on the side wall of the front end of the piston rod, the hydraulic cavity is sealed through the sealing element, the rear end of the ball head mounting part is connected with the front spring pad, the front end of the piston rod is sleeved with an installation frame, an installation space is formed between the ball head installation part and the installation frame, the top rubber is filled in the installation space, the front end of the ball head mounting part is sleeved with a sealing cover, the sealing cover seals the mounting space and limits the top rubber in the mounting space, the mounting rack is provided with an arc part, the radian of the arc part is matched with the radian of the ball head mounting part, and lubricating grease is coated on the outer wall of the ball head mounting part, and lubricating grease is also coated on the inner wall of the arc-shaped part.
7. The strut anti-roll shock absorber assembly according to claim 6, wherein: the ball head mounting part is in threaded connection with the arc-shaped part.
8. The strut anti-roll shock absorber assembly according to claim 6, wherein: the rear end of the ball head mounting part and the front spring pad are integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011282999.5A CN112211944A (en) | 2020-11-17 | 2020-11-17 | Strut type anti-side-tipping shock absorber assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011282999.5A CN112211944A (en) | 2020-11-17 | 2020-11-17 | Strut type anti-side-tipping shock absorber assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112211944A true CN112211944A (en) | 2021-01-12 |
Family
ID=74057078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011282999.5A Pending CN112211944A (en) | 2020-11-17 | 2020-11-17 | Strut type anti-side-tipping shock absorber assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112211944A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113294477A (en) * | 2021-04-21 | 2021-08-24 | 徐州东宏机械制造有限公司 | Air spring with flexible stroke |
-
2020
- 2020-11-17 CN CN202011282999.5A patent/CN112211944A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113294477A (en) * | 2021-04-21 | 2021-08-24 | 徐州东宏机械制造有限公司 | Air spring with flexible stroke |
| CN113294477B (en) * | 2021-04-21 | 2024-05-03 | 徐州东宏机械制造有限公司 | Flexible-stroke gas spring |
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