CN114893526A - Vehicle seat suspension damper for coping with impact - Google Patents

Vehicle seat suspension damper for coping with impact Download PDF

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Publication number
CN114893526A
CN114893526A CN202210608045.1A CN202210608045A CN114893526A CN 114893526 A CN114893526 A CN 114893526A CN 202210608045 A CN202210608045 A CN 202210608045A CN 114893526 A CN114893526 A CN 114893526A
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CN
China
Prior art keywords
cylinder
hydraulic cylinder
sleeve
liquid
piston
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Application number
CN202210608045.1A
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Chinese (zh)
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CN114893526B (en
Inventor
王显会
季劼
孙晓旺
彭兵
张进成
李高伟
皮大伟
王洪亮
王尔烈
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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Priority to CN202210608045.1A priority Critical patent/CN114893526B/en
Publication of CN114893526A publication Critical patent/CN114893526A/en
Application granted granted Critical
Publication of CN114893526B publication Critical patent/CN114893526B/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/50—Seat suspension devices
    • B60N2/52—Seat suspension devices using fluid means
    • B60N2/525—Seat suspension devices using fluid means using gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/50—Seat suspension devices
    • B60N2/52—Seat suspension devices using fluid means
    • B60N2/527—Seat suspension devices using fluid means using liquids
    • 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
    • F16F9/066—Units characterised by the partition, baffle or like element
    • F16F9/067—Partitions of the piston type, e.g. sliding pistons
    • 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
    • F16F9/34—Special valve constructions; Shape or construction of throttling passages
    • F16F9/348—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body
    • F16F9/3484—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body characterised by features of the annular discs per se, singularly or in combination
    • 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
    • F16F2222/00—Special physical effects, e.g. nature of damping effects
    • F16F2222/12—Fluid damping
    • 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
    • F16F2222/00—Special physical effects, e.g. nature of damping effects
    • F16F2222/12—Fluid damping
    • F16F2222/126—Fluid damping using gases

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

The invention relates to a vehicle seat suspension damper for responding to impact. The hydraulic cylinder comprises an inner hydraulic cylinder and an outer hydraulic cylinder, the inner hydraulic cylinder is communicated with the outer hydraulic cylinder through liquid, an upper piston and a lower piston are respectively arranged at the upper end and the lower end of the inner hydraulic cylinder, the outer part of the upper end of the cylinder is connected with the bottom of a seat, the piston head of the lower piston reciprocates in the inner cavity of the inner hydraulic cylinder, and the piston rod of the lower piston penetrates through the lower cavity of the cylinder and is connected with a vehicle floor provided with the seat; when impacted, the impact power is converted into the kinetic energy of the liquid, and the external hydraulic cylinder can move in the cylinder. The invention uses the air cylinder and the hydraulic cylinder which can generate relative motion to realize the partition of the transmission of the impact force; the force of the piston is transmitted to the hydraulic cylinder through the liquid in the hydraulic cylinder, and the air chamber provides a layer of buffer isolated space; the gas in the gas chamber is compressed to store energy, and then the energy stored by the gas is converted into the flow of the liquid in the liquid cylinder, so that the energy is absorbed.

Description

Vehicle seat suspension damper for coping with impact
Technical Field
The invention belongs to the field of vehicle explosion prevention, and particularly relates to a vehicle seat suspension damper for responding to impact.
Background
IEDs from ground mines and Improvised Explosive Devices (IEDs) are a major threat to ground military vehicles. At the bottom of the armored vehicle, at the moment of landmine explosion, severe impact force can be transmitted upwards along with the seat, and severe impact is caused to the waist and the neck of a passenger. At present, few seat suspensions exist at home and abroad, and the traditional impact coping mode mainly comprises the steps of buffering on a protective bottom plate, adding a buffering foot pad on a floor and adding a suspension at the joint of a seat and the floor. In view of the above, a suspension damper mainly coping with high-speed impact has been proposed. In order to cope with such a situation, improvement is required in the damper, and it is required that the damping is small when coping with the impact and the damping is large when the spring releases the elastic potential energy.
Disclosure of Invention
The invention aims to provide a military vehicle seat suspension damper which mainly deals with high-speed impact and simultaneously takes the buffer effect of vibration at low speed into consideration.
The technical solution for realizing the purpose of the invention is as follows: a vehicle seat suspension damper for responding to impact comprises a cylinder and a hydraulic cylinder arranged inside the cylinder, wherein the hydraulic cylinder comprises an inner hydraulic cylinder and an outer hydraulic cylinder, the inner hydraulic cylinder is positioned inside the outer hydraulic cylinder, liquid between the inner hydraulic cylinder and the outer hydraulic cylinder is communicated, an upper piston and a lower piston are respectively arranged at the upper end and the lower end of the inner hydraulic cylinder, the upper piston reciprocates between an inner cavity of the inner hydraulic cylinder and an upper cavity of the cylinder, the outer part of the upper end of the cylinder is connected with the bottom of a seat, a piston head of the lower piston reciprocates in the inner cavity of the inner hydraulic cylinder, and a piston rod of the lower piston penetrates through a lower cavity of the cylinder and then is connected with a vehicle floor on which the seat is mounted;
when impacted, the impact power is converted into the kinetic energy of the liquid, and the external hydraulic cylinder can move in the cylinder.
Further, the cylinder comprises a cylinder sleeve, a cylinder top and a cylinder bottom; the external hydraulic cylinder comprises an external hydraulic cylinder sleeve, a hydraulic cylinder top and a hydraulic cylinder bottom; the internal hydraulic cylinder comprises an internal hydraulic cylinder sleeve; the bottom of the hydraulic cylinder is provided with a permanent magnet base;
the cylinder top, the cylinder sleeve and the top of the hydraulic cylinder form a closed cavity, and the cavities formed by the cylinder bottom, the cylinder sleeve and the bottom of the hydraulic cylinder are not closed and are communicated with the outside atmosphere through the cylinder bottom.
Further, the upper part and the lower part of the inner wall of the cylinder sleeve are respectively provided with an annular rubber ring and a support sleeve, the periphery of the top of the outer hydraulic cylinder sleeve is provided with an annular step, and a slidable buffer sleeve is sleeved between the lower part inside the cylinder and the outer hydraulic cylinder sleeve of the hydraulic cylinder;
the rubber ring is used for limiting the position of the hydraulic cylinder, and the supporting sleeve is used for limiting the buffer sleeve.
Furthermore, a plurality of bulges are uniformly distributed on the inner wall of the upper part of the outer hydraulic cylinder sleeve in the circumferential direction and used for clamping the top of the inner hydraulic cylinder sleeve, and liquid flow channels are formed among the bulges.
Furthermore, a plurality of bulges are uniformly distributed on the inner wall of the lower part of the outer hydraulic cylinder sleeve in the circumferential direction and used for limiting and fixing the position of the inner hydraulic cylinder sleeve.
Further, a bottom plate is arranged at the bottom of the inner hydraulic cylinder sleeve, the lower piston rod penetrates through the bottom plate, a through hole for liquid to flow through is formed in the bottom plate, and a spring diaphragm is arranged on the inner side of the through hole in a matched mode, so that one-way flow of the liquid from outside to inside is achieved.
Furthermore, the piston head of the lower piston is provided with a plurality of through holes, and the outer sides of half of the through holes are provided with spring diaphragms.
Compared with the prior art, the invention has the remarkable advantages that:
(1) the invention provides a new way to cushion impact, applying the suspension system to the seat to reduce the transmission of impact vibration; the disassembly is convenient, and the disassembly can be changed according to the actual situation.
(2) The damper provided by the invention can change the opening and closing of the spring diaphragm along with the impact, so that the damping size is changed; the damper reduces the full open damping of the diaphragm in response to high speed impacts, thereby reducing the force transmitted upward.
(3) The damper provided by the invention simultaneously uses the air cylinder and the hydraulic cylinder, and the air cylinder and the hydraulic cylinder can move relatively, so that the transmission of the impact force is isolated; the force of the piston can be transmitted to the hydraulic cylinder through the liquid in the hydraulic cylinder, and the air chamber provides a layer of buffer isolated space; the gas in the gas chamber can be compressed to store energy, and then the energy stored by the gas can be converted into the flow of the liquid in the liquid cylinder.
(4) The damper provided by the invention utilizes the action of electromagnetic force, so that the cylinder body in the damper can transmit force to the cylinder in time when moving back, the effect of offsetting impact force is realized, the effect of buffering impact force is realized, and the transmission of impact force is greatly reduced.
Drawings
Figure 1 is a schematic cross-sectional view of the damper of the present invention.
Figure 2 is a schematic view of the position of the damper mounted on the seat.
Fig. 3 is a schematic sectional view of the outer cylinder.
Fig. 4 is a schematic view of the lower piston.
FIG. 5 is a schematic illustration of the position of the spring diaphragm within the inner cylinder.
FIG. 6 is a schematic illustration of the flow of liquid in the cylinder under low velocity impact.
Fig. 7 is a schematic view of the liquid flow in the cylinder under medium speed impact.
Description of reference numerals:
1-cylinder top, 2-cylinder top, 3-rubber ring, 4-upper piston, 5-inner hydraulic cylinder sleeve, 6-cylinder sleeve, 7-support sleeve, 8-buffer sleeve, 9-permanent magnet base, 10-lower piston, 11-cylinder bottom, 12-rubber pad, 13-cylinder bottom, 14-outer hydraulic cylinder sleeve, 15-spring diaphragm I, 16-spring diaphragm II.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
As shown in fig. 1-7, a military vehicle seat suspension damper includes a damper mounted position on a vehicle seat, which is mainly composed of an inner hydraulic cylinder, an outer cylinder, an upper piston 4, a lower piston 10 and liquid in the hydraulic cylinder, and the air cylinder and the hydraulic cylinder can move relatively.
For the external cylinder, the cylinder sleeve 6 forms a cylinder body with the cylinder top 1 and the cylinder bottom 11, the cylinder top 1 and the cylinder sleeve 6 are closed, and the cylinder bottom 11 and the cylinder sleeve 6 are not closed.
For the internal hydraulic cylinder, the internal hydraulic cylinder comprises an external hydraulic cylinder consisting of a hydraulic cylinder top 2, a hydraulic cylinder bottom 13 and an external hydraulic cylinder sleeve 14, and the internal hydraulic cylinder sleeve 5 is arranged in the external hydraulic cylinder to divide the interior of the external hydraulic cylinder into two layers, and the bottom of the external hydraulic cylinder is provided with a permanent magnet base 9.
The bottom of the inner hydraulic cylinder is provided with a one-way hole, the hole is provided with a spring diaphragm, the spring diaphragm can be opened by a corresponding amplitude along with different forces, and the one-way hole only allows liquid in the cylinder to flow from bottom to top.
For the lower piston 10, one of two kinds of holes on the lower piston 10 is a normally open hole, and the other is a hole with a spring diaphragm having a one-way valve function, the spring diaphragm can be opened by a corresponding amplitude along with different forces, and the one-way hole only allows liquid in the cylinder to flow from top to bottom.
Comprising a support sleeve 7 and a damping sleeve 8 between the hydraulic cylinder and the air cylinder.
The air cylinder and the hydraulic cylinder form a closed air chamber at the top, and the closed air chamber is formed among the hydraulic cylinder, the air cylinder, the supporting sleeve 7 and the buffer sleeve 8. The liquid cylinder, the air cylinder and the cylinder bottom 11 form an unclosed air chamber.
Due to explosion impact, the lower piston 10 can rapidly move upwards, impact force can be transmitted to liquid in the cylinder, the force received by the liquid can be transmitted to the liquid cylinder, the liquid cylinder moves under the force, and the buffer sleeve 8 (magnetic conduction) can be pushed under the action of the permanent magnet 9 at the bottom of the outer liquid cylinder, so that a closed air chamber is formed among the compressed liquid cylinder, the air cylinder, the support sleeve and the buffer sleeve 8. After the impact time has elapsed, the cushion collar 8 will return to its original position due to the air pressure. The other air cells are also compressed and take up the impact force.
The pressure of the air chamber will then push the hydraulic cylinder back, and this reverse movement of the hydraulic cylinder will accelerate the flow of liquid in the cylinder, increasing the energy consumption while a part of the force will be transmitted to the cylinder due to the presence of the electromagnet, thereby imparting to the cylinder a movement in the opposite direction to that of the lower piston 10 and thus reducing the impact.
The liquid in the cylinder will flow downwards from the holes on the piston and upwards from the holes at the bottom of the inner cylinder due to the impact force received by the lower piston 10, thereby converting the impact energy into the kinetic energy and the internal energy of the liquid.
When the damper is compressed and then stretched by the spring, all of the spring diaphragms close and the damping increases, slowing the stretching of the spring.
The working principle is as follows:
no high speed impact (usual travel):
both the hole in the lower piston 10 and the hole in the bottom of the inner cylinder have spring diaphragms 15, 16 acting as valves to control the flow of liquid. The impact force of the piston is transmitted to the liquid, forcing the liquid to flow downwards, and the pressure of the liquid will push the spring diaphragms 15, 16, and the spring diaphragms 15, 16 will open to a certain extent under different pressures. The diaphragm 16 does not open during normal driving, and the amplitude of opening of the diaphragm 15 is small. At this time, the damping is large, and the liquid between the inner and outer cylinder bodies and in the inner cylinder does not circulate. The gas in the cylinder then acts as a spring. The fluid flows from the piston bore to the other side, as shown in fig. 6.
Medium-speed impact:
the spring diaphragm 15 of the lower piston hole is opened to a large extent, and the spring diaphragm 16 of the inner hydraulic cylinder is opened to a small extent. The flow direction of the liquid is as shown in fig. 7. How much the arrows indicate how fast the liquid flows. At this time, most of the liquid flows from the lower piston hole, and very little liquid flows back from between the outer cylinder and the inner cylinder. The damping is slightly reduced at this time.
High-speed impact:
all spring diaphragms open up considerably at high speed impacts. When in high-speed impact, the force from the lower piston can rapidly compress the liquid in the cylinder, and because the movement speed of the lower piston 10 is high, the liquid in the cylinder cannot be in time to form backflow, most of the force can be transmitted into the hydraulic cylinder to force the hydraulic cylinder to move towards the cylinder top 1, and meanwhile, the upper piston 4 can also move towards the cylinder top 1. These movements compress the gas in the upper chamber, converting kinetic energy into internal energy. Meanwhile, the permanent magnet base 9 and the buffer sleeve 8 at the bottom 13 of the liquid cylinder can generate electromagnetic induction quickly due to the change of magnetic flux, the electromagnetic force is generated to force the buffer sleeve 8 to move towards the top 1 of the cylinder, and gas between the cylinder sleeve and the liquid outer cylinder is compressed to serve as one of impact buffers.
After passing the high-speed impact stage, the gas pressure in the gas chamber is high, so that the hydraulic cylinder is pushed to move towards the cylinder bottom 11 in the direction opposite to the direction of the movement of the lower piston 10. This reverse movement of the hydraulic cylinder accelerates the flow of liquid in the cylinder, increasing energy consumption while imparting a portion of the force to the cylinder due to the presence of the electromagnet, thereby imparting to the cylinder a movement opposite to the direction of movement of the lower piston and thus reducing the impact.
When the piston is stretched:
all valves in the hydraulic cylinder are closed quickly, and no liquid in the internal hydraulic cylinder or the external hydraulic cylinder flows circularly, so that the damping of the hydraulic cylinder is increased, and the piston stretches slowly.

Claims (7)

1. A vehicle seat suspension damper for responding impact is characterized by comprising a cylinder and a hydraulic cylinder arranged in the cylinder, wherein the hydraulic cylinder comprises an inner hydraulic cylinder and an outer hydraulic cylinder, the inner hydraulic cylinder is positioned in the outer hydraulic cylinder, liquid between the inner hydraulic cylinder and the outer hydraulic cylinder is communicated, an upper piston and a lower piston are respectively arranged at the upper end and the lower end of the inner hydraulic cylinder, the upper piston reciprocates between an inner cavity of the inner hydraulic cylinder and an upper cavity of the cylinder, the outer part of the upper end of the cylinder is connected with the bottom of a seat, a piston head of the lower piston reciprocates in the inner cavity of the inner hydraulic cylinder, and a piston rod of the lower piston penetrates through a lower cavity of the cylinder and then is connected with a vehicle floor on which the seat is mounted;
when impacted, the impact power is converted into the kinetic energy of the liquid, and the external hydraulic cylinder can move in the cylinder.
2. The damper of claim 1, wherein the cylinder comprises a cylinder liner, a cylinder top and a cylinder bottom; the external hydraulic cylinder comprises an external hydraulic cylinder sleeve, a hydraulic cylinder top and a hydraulic cylinder bottom; the internal hydraulic cylinder comprises an internal hydraulic cylinder sleeve; the bottom of the hydraulic cylinder is provided with a permanent magnet base;
the cylinder top, the cylinder sleeve and the top of the hydraulic cylinder form a closed cavity, and the cavities formed by the cylinder bottom, the cylinder sleeve and the bottom of the hydraulic cylinder are not closed and are communicated with the outside atmosphere through the cylinder bottom.
3. The damper according to claim 2, characterized in that the upper and lower parts of the inner wall of the cylinder sleeve are respectively provided with an annular rubber ring and a support sleeve, the periphery of the top of the outer cylinder sleeve is provided with an annular step, and a slidable buffer sleeve is sleeved between the lower part inside the cylinder and the outer cylinder sleeve of the hydraulic cylinder;
the rubber ring is used for limiting the position of the hydraulic cylinder, and the supporting sleeve is used for limiting the buffer sleeve.
4. The damper as claimed in claim 3, wherein a plurality of protrusions are uniformly distributed on the inner wall of the upper portion of the outer cylinder sleeve in the circumferential direction and used for clamping the top of the inner cylinder sleeve, and liquid flow passages are formed among the plurality of protrusions.
5. The damper of claim 4, wherein a plurality of protrusions are evenly distributed on the inner wall of the lower part of the outer cylinder sleeve in the circumferential direction and used for limiting and fixing the position of the inner cylinder sleeve.
6. The damper according to claim 5, wherein the bottom of the inner cylinder sleeve is provided with a bottom plate, the lower piston rod passes through the bottom plate, the bottom plate is provided with a through hole for liquid to flow through, and a spring diaphragm is arranged inside the through hole to realize unidirectional liquid flow from the outer cylinder to the inner cylinder.
7. The damper according to claim 6, wherein the lower piston head is provided with a plurality of through holes, and a spring diaphragm is provided outside half of the through holes.
CN202210608045.1A 2022-05-31 2022-05-31 Vehicle seat suspension damper for coping with impact Active CN114893526B (en)

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CN202210608045.1A CN114893526B (en) 2022-05-31 2022-05-31 Vehicle seat suspension damper for coping with impact

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Application Number Priority Date Filing Date Title
CN202210608045.1A CN114893526B (en) 2022-05-31 2022-05-31 Vehicle seat suspension damper for coping with impact

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CN114893526B CN114893526B (en) 2023-09-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117122779A (en) * 2023-09-04 2023-11-28 汶上县汶上街道社区卫生服务中心 Emergency breathing device for medical clinic

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01135933A (en) * 1987-11-20 1989-05-29 Ishii Kogyo Kk Hybrid damper
CN202402546U (en) * 2011-12-09 2012-08-29 常州气弹簧有限公司 Lifting air spring of rigidity locking seat
CN103438140A (en) * 2013-08-28 2013-12-11 株洲南车时代电气股份有限公司 Pantograph damper damping throttling device
CN208311346U (en) * 2018-05-02 2019-01-01 青岛奥德精密器械有限公司 A kind of exacerbation gas bar
CN209839039U (en) * 2019-03-12 2019-12-24 韶关市伟光液压油缸有限公司 Static pile driver landing leg hydro-cylinder with gas-liquid buffer function
CN212400993U (en) * 2020-07-31 2021-01-26 南京理工大学 Military vehicle seat buffering and isolating device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01135933A (en) * 1987-11-20 1989-05-29 Ishii Kogyo Kk Hybrid damper
CN202402546U (en) * 2011-12-09 2012-08-29 常州气弹簧有限公司 Lifting air spring of rigidity locking seat
CN103438140A (en) * 2013-08-28 2013-12-11 株洲南车时代电气股份有限公司 Pantograph damper damping throttling device
CN208311346U (en) * 2018-05-02 2019-01-01 青岛奥德精密器械有限公司 A kind of exacerbation gas bar
CN209839039U (en) * 2019-03-12 2019-12-24 韶关市伟光液压油缸有限公司 Static pile driver landing leg hydro-cylinder with gas-liquid buffer function
CN212400993U (en) * 2020-07-31 2021-01-26 南京理工大学 Military vehicle seat buffering and isolating device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117122779A (en) * 2023-09-04 2023-11-28 汶上县汶上街道社区卫生服务中心 Emergency breathing device for medical clinic
CN117122779B (en) * 2023-09-04 2024-04-02 汶上县汶上街道社区卫生服务中心 Emergency breathing device for medical clinic

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