CN209687985U - The cylinder type damper of adaptive damping - Google Patents
The cylinder type damper of adaptive damping Download PDFInfo
- Publication number
- CN209687985U CN209687985U CN201920340809.7U CN201920340809U CN209687985U CN 209687985 U CN209687985 U CN 209687985U CN 201920340809 U CN201920340809 U CN 201920340809U CN 209687985 U CN209687985 U CN 209687985U
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- cavity
- piston rod
- piston
- type damper
- conduit
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- 238000013016 damping Methods 0.000 title claims abstract description 45
- 230000003044 adaptive effect Effects 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 239000002828 fuel tank Substances 0.000 claims description 16
- 238000005192 partition Methods 0.000 claims description 14
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 abstract description 11
- 230000006835 compression Effects 0.000 abstract description 10
- 239000000725 suspension Substances 0.000 abstract description 10
- 239000011148 porous material Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
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- Fluid-Damping Devices (AREA)
Abstract
This application discloses a kind of cylinder type dampers of adaptive damping, belong to art of vehicle suspension field.The cylinder type damper includes cylinder barrel, piston rod and piston, conduit, and three forms the oil pocket of three relative closures, i.e. the first cavity, the second cavity and third cavity after being mutually arranged.The first kind through-hole of successively array is equipped on duct wall between first cavity and third cavity in the axial direction, oil liquid can flow into third cavity from the first cavity by first kind through-hole or flow into the first cavity from third cavity, form damping.It when cylinder type damper compression, is reduced with the increase first kind number of through-holes of stroke, thus damping increases, i.e. damping increases with compression travel and increased.
Description
Technical field
The utility model belongs to art of vehicle suspension field, is related to a kind of cylinder type damper of adaptive damping.
Background technique
Damper is the important component of vehicle hanging, and predominantly vehicle suspension system provides damping.Currently, damper
It is various informative, and cylinder type damper is most widely used in various types of vehicles.
Traditional cylinder type damper is mainly made of cylinder barrel, piston and piston rod, oil storage cavity (cylinder), shield etc., in work
It is equipped with damping hole and one-way pressure-limit valve beyond the Great Wall, its working principle is that stretching, in compression process in damper, using cylinder barrel inner fluid through work
When damping hole beyond the Great Wall flows into the second cavity (when compression) from the first cavity or flows into the first cavity (when elongation) from the second cavity
The back pressure of generation provides damping force for suspension.
It is well known that the pressure that oil liquid flows through damping hole generation is mainly related with damping hole internal diameter and flow rate of liquid.And work as
When damping hole is fixed, pressure is mainly related to flow velocity, corresponding, the damping force of cylinder type damper then main cylinder barrel opposite with piston
The speed of movement is related, and speed is faster, and damping force is bigger, otherwise the smaller damping force of speed is also smaller.And in actual use, when
For vehicle driving in recessed low uneven road surface, speed is unhappy it may be desirable to suspension damping force is larger to prevent from leading because of suspension " too soft "
Vehicle bottom is caused to collide with ground；In addition, for part engineering vehicle chassis, there are also wish when operation suspension latch into rigidity with
The demand of fixing bodywork.Obviously, existing cylinder type damper does not have these functions.
Utility model content
To solve the problems mentioned above in the background art.The utility model provides a kind of cartridge type vibration damping of adaptive damping
Device, realize the damping of cylinder type damper to stretch, both indention journey and speed it is related, and have the function of realizing suspension locking.
A kind of cylinder type damper of adaptive damping, including cylinder barrel, piston rod, piston and conduit, in which:
Conduit is fixedly installed on the partition in cylinder barrel, and the axis of conduit and the axis of cylinder barrel are parallel, and conduit is embedded in work
In plug and piston rod, the outer wall of conduit is bonded with the inner wall of piston, and there are spaces between the inner wall of piston rod；
The first end of piston rod is fixedly connected with head, and the second end of piston rod is fixedly connected on piston, and piston is installed on
In cylinder barrel, and the outer wall of piston is bonded with the inner wall of cylinder barrel, and the first end of cylinder barrel is provided with the opening being oriented to piston rod,
And the outer wall of piston rod and opening gluing, sealing, the diameter of opening are less than the diameter of cylinder barrel, piston and piston rod are together with respect to cylinder
Cylinder axially moves；
The first cavity is formed between cylinder barrel and conduit, and the second cavity, conduit and piston rod are formed between piston rod and cylinder barrel
Between form third cavity, one in the first cavity and third cavity is connected to by switch valve with the fuel tank in the external world；
Conduit axially on offer first kind through-hole, the first cavity and third chamber is connected by space in conduit
Body；Piston rod offers the second class through-hole on one end of piston, the second cavity and third cavity is connected.
By the way that axial narrow meshed conduit is arranged between cylinder barrel and piston and piston rod inner hole, make cylinder type damper first
Axial damping hole is formed between third cavity outside cavity and connection.When cylinder type damper compression, with compression travel
Increase, the damping hole between the first cavity and third cavity is reduced, and damping increases；And when cylinder type damper elongation, stroke is got over
Greatly, the damping hole that work is participated between the first cavity and third cavity is more, damps smaller.Therefore, cylinder type damper is realized
Damping changes with stroke and is changed.
In addition, cylinder type damper and external oil circuit are cut off, and piston rod is with respect to cylinder barrel when the switch valve of setting is closed
Axial movement is limited, and entire cylinder type damper is in a stiffener, it is thereby achieved that the locking of suspension.
Optionally, the first mounting hole is offered on partition, and inlet valve is installed in the first mounting hole, inlet valve is check valve,
Inlet valve is opened when oil pressure is lower than the first setting value in oil pressure ratio third cavity in the first cavity, so that oil liquid is by third cavity
It is unidirectional to flow into the first cavity.
Optionally, it is also provided with the second mounting hole on partition, pressure limiting valve is installed in the second mounting hole, pressure limiting valve is unidirectional
Valve, pressure limiting valve is opened when oil pressure is higher than the second setting value in oil pressure ratio third cavity in the first cavity, so that oil liquid is by first
Cavity unidirectionally flows into third cavity.
Optionally, the first oil pipe channel for being connected to third cavity and oil pipe is provided in head, oil pipe is for connecting
Logical fuel tank.
Optionally, the second end of cylinder barrel is equipped with cylinder head, and for being connected to the first cavity and oil pipe is provided in cylinder head
Two oil pipe channels.
Optionally, oil pipe is equipped with switch valve, for controlling the company in the first oil pipe channel or the second oil pipe channel and fuel tank
Logical and cutting.
Optionally, detachable plug screw, plug screw are installed on one in the first oil pipe channel and the second oil pipe channel
For blocking installed oil pipe channel.In practical applications, the first oil pipe channel is connected to one in the second oil pipe channel
External fuel tank, the oil pipe channel for not being connected to fuel tank can be clogging by plug screw.
Optionally, first kind through-hole uniform array is arranged on conduit, by setting uniform array for first kind through-hole
Arrangement can ensure that harmony when flowing of the oil liquid between the first cavity and third cavity.
Optionally, the second class through-hole is symmetrical arranged, by being set as symmetrically may insure oil liquid the second class through-hole
Harmony when flowing between two cavitys and third cavity.
Optionally, the cylinder type damper of adaptive damping further includes being sheathed on outside piston rod and outside cylinder barrel first end
Shield, for protecting piston rod exposed parts.
At least one of above-mentioned various optional technical characteristics can according to the actual situation selectively with cylinder barrel, piston
The correlated characteristic of bar, piston and conduit combines and forms technical solution.
It should be understood that the above general description and the following detailed description are merely exemplary, this can not be limited
Utility model.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets the utility model
Embodiment, and be used to explain the principles of the present invention together with specification.
Fig. 1 is the axial section signal of the cylinder type damper of the adaptive damping provided in the utility model one embodiment
Figure.
Wherein, appended drawing reference is as follows:
1, cylinder barrel；101, partition；2, piston rod；201, the second class through-hole；3, piston；4, conduit；401, first kind through-hole；
5, cylinder head；6, inlet valve；7, pressure limiting valve；8, head；9, plug screw；10, oil pipe；11, fuel tank；12, switch valve；13, shield；
14, the first cavity；15, the second cavity；16, third cavity.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the utility model.On the contrary, they be only with such as
The example of the consistent device and method of some aspects be described in detail in the appended claims, the utility model.
Fig. 1 is the axial section signal of the cylinder type damper of the adaptive damping provided in the utility model one embodiment
Figure, the cylinder type damper of the adaptive damping may include cylinder barrel 1, piston rod 2, piston 3 and conduit 4, the relationship between each component
It is as follows:
Conduit 4 is fixedly installed on the partition 101 in cylinder barrel 1, and the axis of conduit 4 is parallel with the axis of cylinder barrel 1, conduit 4
Be embedded in piston 3 and piston rod 2, the outer wall of conduit 4 is bonded with the inner wall of piston 3, and between the inner wall of piston rod 2 there are
Space.
In one possible implementation, the second end of cylinder barrel 1 is arranged in partition 101, and partition 101 can be perpendicular to cylinder
Cylinder 1 axis direction setting.Further, the distance between partition 101 and 1 second end of cylinder barrel top are less than partition 101 and cylinder barrel 1
The distance between at the top of first end.
The first end of piston rod 2 is fixedly connected with head 8, and the second end of piston rod 2 is fixedly connected on piston 3, and piston 3 is pacified
Loaded in cylinder barrel 1, and the outer wall of piston 3 is bonded with the inner wall of cylinder barrel 1, and the first end of cylinder barrel 1, which is provided with, leads piston rod 2
To opening, and the outer wall of piston rod 2 and opening gluing, sealing, the diameter of opening are less than the diameter of cylinder barrel 1, piston 3 and piston
Bar 2 axially moves with respect to cylinder barrel 1 together.
In general, along the third pores being provided with perpendicular to inner wall, the outer wall of third pores and conduit 4 on the inner wall of piston 3
Cooperation, has sealed set between third pores and the outer wall of conduit 4.
The opening of cylinder barrel 1 has certain thickness, and the outer wall of piston rod 2 is bonded with the inner wall of opening, and piston rod 2 and cylinder
It is sealed between the opening inner wall of cylinder 1.In addition, also sealed set between piston 3 and cylinder barrel 1.
The first cavity 14 is formed between cylinder barrel 1 and conduit 4, and the second cavity 15, conduit 4 are formed between piston rod 2 and cylinder barrel 1
Third cavity 16 is formed between piston rod 2, one in the first cavity 14 and third cavity 16 passes through switch valve 12 and the external world
Fuel tank 11 be connected to.
First kind through-hole 401 is offered on conduit 4, the first cavity 14 and third cavity is connected by space in conduit 4
16.For example, oil liquid can flow into third cavity 16 from the first cavity 14 by first kind through-hole 401 or flow into the from third cavity 16
One cavity 14.
Optionally, 401 uniform array of first kind through-hole is arranged on conduit 4, by setting equal for first kind through-hole 401
Even array arrangement may insure harmony when flowing of the oil liquid between the first cavity 14 and third cavity 16.
Piston rod 2 offers the second class through-hole 201 on one end of piston 3, with the second cavity of conducting 15 and third chamber
Body 16.In this way, oil liquid can flow into third cavity 16 from the second cavity 15 or flow into the second cavity 15 by third cavity 16.
Second class through-hole 201 is symmetrical arranged, by the way that set the second class through-hole 201 to symmetrically can be with oil liquid in the second cavity
Harmony when flowing between 15 and third cavity 16.
Optionally, cylinder barrel 1 is cylindrical, corresponding, and piston 3 is cylinder, and piston rod 2 is also cylindrical shape, and conduit 4 is circle
Cylindrical tubular.
In one possible implementation, the first mounting hole is offered on partition 101, and oil inlet is installed in the first mounting hole
Valve 6, inlet valve 6 are check valve, and oil pressure is lower than the first setting value to inlet valve 6 in oil pressure ratio third cavity 16 in the first cavity 14
Shi Kaiqi, so that oil liquid unidirectionally flows into the first cavity 14 by third cavity 16.That is, when 14 oil pressure of the first cavity is obviously low
It is opened when third 16 oil pressure of cavity, oil liquid can be made unidirectionally to flow into the first cavity 14 by third cavity 16.
Optionally, it is also provided with the second mounting hole on partition 101, pressure limiting valve 7 is installed in the second mounting hole, pressure limiting valve 7 is
Check valve, pressure limiting valve 7 is opened when oil pressure is higher than the second setting value in oil pressure ratio third cavity 16 in the first cavity 14, so that oily
Liquid unidirectionally flows into third cavity 16 by the first cavity 14.
In the actually realization of connection external fuel tank 11, can be realized at least through the following two kinds mode:
First way is provided with 10 channel of the first oil pipe for being connected to third cavity 16 and oil pipe 10 in head 8,
Oil pipe 10 is for being connected to fuel tank 11.
The second way, the second end of cylinder barrel 1 are equipped with cylinder head 5, be provided in cylinder head 5 for be connected to the first cavity 14 and
10 channel of the second oil pipe of oil pipe 10.
In order to realize fuel feeding opportunity of the fuel tank 11 to cylinder barrel 1, it can be equipped with switch valve 12 on oil pipe 10, for controlling first
The connection and cutting in 10 channel of oil pipe or 10 channel of the second oil pipe and fuel tank 11.Here switch valve 12 can be manual switch
Valve, or electric switching valve.When switch valve 12 is electric switching valve, switch valve 12 and control module or processor are electrical
Connection is connected to or cuts off according to the instruction execution that control module or processor issue.
In actual use, the first end of piston rod 2 usually stretches out in outside the opening of cylinder barrel 1, in order to realize to piston rod 2
Protection, the cylinder type damper of adaptive damping can also include be sheathed on it is anti-outside 2 outside of piston rod and 1 first end of cylinder barrel
The inner wall of shield 13, shield 13 is bonded and seals with cylinder barrel 1, and shield 13, which is also formed between piston rod 2, more to be sealed
Space, in this way, shield 13 may be implemented to protect the exposed parts of piston rod 2.
By said structure design, the working principle of the application is as follows:
When switch valve 12 is in the open state, third cavity 16 is connected to fuel tank 11, at this point, if vehicle is risen by road surface
Volt compression cylinder type damper, the then head 8 being fixed together, piston rod 2 and piston 3 are transported with respect to cylinder barrel 1 to compression direction
Dynamic, 15 volume of the second cavity increases and passes through the second class through-hole 201 on piston rod 2 from 16 oil suction of third cavity, the first cavity
14 volumes, which reduce, to be pressed into third cavity 16 through the first kind through-hole 401 on conduit 4 for oil liquid；At this point, the first cavity 14 is in
Simultaneously damping force is consequently formed in high pressure conditions, and the pressure of the first cavity 14 depends on 3 compression speed of piston, that is, oil liquid outflow speed
The number of the first kind through-hole 401 of work is participated on degree and conduit 4, the first kind through-hole 401 that work is participated on conduit 4 is mainly
First kind through-hole 401 between the first cavity 14 and third cavity 16；And when cylinder type damper compression travel it is bigger, first
Cavity 14 highly reduces, and the first kind through-hole 401 for participating in work is reduced, and the pressure with the first cavity 14 under uniform velocity increases, resistance
Buddhist nun increases.Therefore, the utility model realizes cylinder type damper damping and changes with the variation of compression travel.
When switch valve 12 is in close state, the connection oil circuit 10 of third cavity 16 and fuel tank 11 is cut off, at this time cartridge type
The first cavity 14, third cavity 16 and the second cavity 15 in damper are in communication with the outside cutting, the volume of three and remain normal
Number cannot change, and if piston rod 2 with respect to cylinder barrel 1 outwardly or inwardly move all by change three chambers total measurement (volume) and, therefore, this
Piston rod 2 is fixed from dynamic with respect to cylinder barrel 1 when a, i.e., cylinder type damper is in a rigid body, and correspondence is made to be suspended in locking
State realizes suspension locking.
Those skilled in the art will readily occur to this after considering specification and practicing the utility model of utility model here
Other embodiments of utility model.This application is intended to cover any variations, uses, or adaptations of the utility model,
These variations, uses, or adaptations follow the general principle of the utility model and unpractical new including the utility model
The common knowledge or conventional techniques in the art of type.The description and examples are only to be considered as illustrative, this reality
It is indicated by the following claims with novel true scope and spirit.
It should be understood that the utility model is not limited to the accurate knot for being described above and being shown in the accompanying drawings
Structure, and various modifications and changes may be made without departing from the scope thereof.The scope of the utility model is only wanted by appended right
It asks to limit.
Claims (10)
1. a kind of cylinder type damper of adaptive damping, which is characterized in that the cylinder type damper of the adaptive damping includes cylinder barrel, work
Stopper rod, piston and conduit, in which:
The conduit is fixedly installed on the partition in the cylinder barrel, and the axis of the conduit is parallel with the axis of the cylinder barrel,
The conduit is embedded in the piston and the piston rod, and the outer wall of the conduit is bonded with the inner wall of the piston, and with
There are spaces between the inner wall of the piston rod；
The first end of the piston rod is fixedly connected with head, and the second end of the piston rod is fixedly connected on the piston, institute
It states piston to be installed in the cylinder barrel, and the outer wall of the piston is bonded with the inner wall of the cylinder barrel, the first end of the cylinder barrel
It is provided with the opening being oriented to the piston rod, and the outer wall of the piston rod and the opening gluing, sealing, it is described to open
The diameter of mouth is less than the diameter of the cylinder barrel, and the relatively described cylinder barrel axially moves together for the piston and the piston rod；
The first cavity is formed between the cylinder barrel and the conduit, and the second cavity is formed between the piston rod and the cylinder barrel,
Third cavity is formed between the conduit and the piston rod, one in first cavity and the third cavity is by opening
Valve is closed to be connected to extraneous fuel tank；
The conduit axially offers first kind through-hole, first cavity and institute is connected by space in the conduit
State third cavity；The piston rod offers the second class through-hole on one end of the piston, second cavity is connected
With the third cavity.
2. the cylinder type damper of adaptive damping according to claim 1, which is characterized in that offer first on the partition
Mounting hole, first mounting hole is interior to install inlet valve, and the inlet valve is check valve, and the inlet valve is in first cavity
It is opened when oil pressure is lower than the first setting value in third cavity described in interior oil pressure ratio, so that oil liquid is unidirectionally flowed by the third cavity
First cavity.
3. the cylinder type damper of adaptive damping according to claim 1, which is characterized in that be also provided on the partition
Two mounting holes, second mounting hole is interior to install pressure limiting valve, and the pressure limiting valve is check valve, and the pressure limiting valve is in first chamber
It is opened when oil pressure is higher than the second setting value in third cavity described in internal oil pressure ratio, so that oil liquid is by the first cavity one-way flow
Enter the third cavity.
4. the cylinder type damper of adaptive damping according to claim 1, which is characterized in that be provided with and be used in the head
It is connected to the first oil pipe channel of the third cavity and oil pipe, the oil pipe is for being connected to fuel tank.
5. the cylinder type damper of adaptive damping according to claim 4, which is characterized in that the second end of the cylinder barrel is equipped with
Cylinder head is provided with the second oil pipe channel for being connected to first cavity and oil pipe in the cylinder head.
6. the cylinder type damper of adaptive damping according to claim 5, which is characterized in that the oil pipe is equipped with described open
Valve is closed, for controlling the connection and cutting in first oil pipe channel or second oil pipe channel and the fuel tank.
7. the cylinder type damper of adaptive damping according to claim 5, which is characterized in that first oil pipe channel and institute
It states and detachable plug screw is installed on one in the second oil pipe channel, the plug screw is logical for blocking installed oil pipe
Road.
8. the cylinder type damper of adaptive damping according to claim 1, which is characterized in that the uniform battle array of first kind through-hole
Column are arranged on the conduit.
9. the cylinder type damper of adaptive damping according to claim 1, which is characterized in that the second class through-hole is symmetrically set
It sets.
10. according to claim 1 in -9 any adaptive damping cylinder type damper, which is characterized in that it is described can variable resistance
The cylinder type damper of Buddhist nun further includes the shield being sheathed on outside the piston rod and outside the cylinder barrel first end, for pair
The piston rod exposed parts are protected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920340809.7U CN209687985U (en) | 2019-03-18 | 2019-03-18 | The cylinder type damper of adaptive damping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920340809.7U CN209687985U (en) | 2019-03-18 | 2019-03-18 | The cylinder type damper of adaptive damping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209687985U true CN209687985U (en) | 2019-11-26 |
Family
ID=68605179
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920340809.7U Expired - Fee Related CN209687985U (en) | 2019-03-18 | 2019-03-18 | The cylinder type damper of adaptive damping |
Country Status (1)
| Country | Link |
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| CN (1) | CN209687985U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042689A (en) * | 2019-11-27 | 2020-04-21 | 扬州市江都永坚有限公司 | Special buffer for heavy hydraulic opening and closing device |
| CN111946769A (en) * | 2020-08-21 | 2020-11-17 | 安徽斯瓦克汽车配件有限公司 | Hydraulic buffer for automobile |
| CN111981076A (en) * | 2020-08-21 | 2020-11-24 | 安徽斯瓦克汽车配件有限公司 | Hydraulic buffer for automobile |
| CN112727978A (en) * | 2021-01-22 | 2021-04-30 | 保定市东利机械制造股份有限公司 | Damping self-adaptation automobile shock absorber ware |
| CN114877005A (en) * | 2022-04-13 | 2022-08-09 | 山东阿诺达汽车零件制造有限公司 | Variable damping device of valve plate-free piston matched single-layer pipe small-hole damper |
-
2019
- 2019-03-18 CN CN201920340809.7U patent/CN209687985U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042689A (en) * | 2019-11-27 | 2020-04-21 | 扬州市江都永坚有限公司 | Special buffer for heavy hydraulic opening and closing device |
| CN111946769A (en) * | 2020-08-21 | 2020-11-17 | 安徽斯瓦克汽车配件有限公司 | Hydraulic buffer for automobile |
| CN111981076A (en) * | 2020-08-21 | 2020-11-24 | 安徽斯瓦克汽车配件有限公司 | Hydraulic buffer for automobile |
| CN112727978A (en) * | 2021-01-22 | 2021-04-30 | 保定市东利机械制造股份有限公司 | Damping self-adaptation automobile shock absorber ware |
| CN112727978B (en) * | 2021-01-22 | 2023-01-06 | 保定市东利机械制造股份有限公司 | Damping self-adaptation automobile shock absorber ware |
| CN114877005A (en) * | 2022-04-13 | 2022-08-09 | 山东阿诺达汽车零件制造有限公司 | Variable damping device of valve plate-free piston matched single-layer pipe small-hole damper |
| CN114877005B (en) * | 2022-04-13 | 2023-10-17 | 山东阿诺达汽车零件制造有限公司 | Variable damping device of valve-plate-free piston matched single-layer pipe small-hole damper |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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| CF01 | Termination of patent right due to non-payment of annual fee |