CN111070989A - Self-balancing system for vehicle body - Google Patents
Self-balancing system for vehicle body Download PDFInfo
- Publication number
- CN111070989A CN111070989A CN201811216318.8A CN201811216318A CN111070989A CN 111070989 A CN111070989 A CN 111070989A CN 201811216318 A CN201811216318 A CN 201811216318A CN 111070989 A CN111070989 A CN 111070989A
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- China
- Prior art keywords
- balancing
- oil chamber
- vehicle body
- wheel
- balance
- Prior art date
- 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.)
- Pending
Links
- 238000013016 damping Methods 0.000 claims description 30
- 239000004519 grease Substances 0.000 claims description 13
- 238000001125 extrusion Methods 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims 1
- 230000035939 shock Effects 0.000 abstract description 21
- 239000006096 absorbing agent Substances 0.000 abstract 4
- 239000003921 oil Substances 0.000 description 44
- 238000010521 absorption reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000000725 suspension Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 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
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
- B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
- B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/06—Characteristics of dampers, e.g. mechanical dampers
- B60G17/08—Characteristics of fluid dampers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
- B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
- B60G21/06—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
- B60G2202/20—Type of damper
- B60G2202/24—Fluid damper
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The invention discloses a self-balancing system of a vehicle body, belongs to the field of vehicle balancing devices, and is used for solving the problem that the stress of one shock absorber cannot be shared with the other shock absorbers under the condition of extremely poor road conditions because each shock absorber in the conventional shock absorber system is of an independent structure. The vehicle wheel load balancing device comprises at least two balancing units with variable volumes, wherein the balancing units are used for supporting the vehicle body and the wheels, are communicated through pipelines, and flow in the pipelines through media when the load of any wheel changes so as to balance the load of each wheel. According to the technical scheme, when the load of any wheel changes, the medium flows in the pipeline to balance the load of each wheel.
Description
Technical Field
The invention belongs to the field of vehicle balancing devices, and particularly relates to a vehicle balancing system.
Background
The vehicle passes through the wheel and traveles, because the road conditions is different between each vehicle and the bottom surface in the driving process, the reaction force that it received will also be different, jolts easily appearing, for this reason, each wheel all sets up the shock attenuation, reduces the condition of jolting of automobile body in the driving process.
However, each shock absorption in the current shock absorption system is an independent structure, and under the condition of extremely poor road conditions, the stress of one shock absorption cannot be shared with the other shock absorption.
Disclosure of Invention
The present invention aims to provide a vehicle balancing system which overcomes the deficiencies of the prior art. In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a self-balancing system for a vehicle body comprises at least two balancing units which correspond to wheels one to one and are used for supporting the variable volume between the vehicle body and the wheels, wherein the balancing units are communicated through pipelines, and when the load of any wheel changes, a medium flows in the pipelines to balance the load of each wheel.
By adopting the technical scheme, when the automobile runs to the pothole road surface and one wheel is sunk into the pothole, the pressure borne by the sunk wheel is borne by other wheels, the stress of the other wheels is transferred to the balancing unit, and the balancing unit extrudes media which are not contained in the wheels to flow to the balancing unit of the sunk wheel so as to prolong the length of the balancing unit of the sunk wheel and enable the media to be in contact with the pothole bottom, so that the load of each wheel is balanced; when the automobile runs to a convex hull road surface, when one wheel is jacked up, the pressure borne by the jacked wheel is increased, media are squeezed to the balancing units of other unstressed wheels through the balancing units, the balancing units of the unstressed wheels in all the wheels are supported by the media pressed in to prolong the length of the balancing units, and the balancing units are in contact with the road surface to balance the load of all the wheels.
Further inject, the balancing unit includes shock attenuation body and grease chamber, grease chamber cover is in the outside one end of shock attenuation body piston rod, grease chamber and the coaxial setting of shock attenuation body piston rod, grease chamber bottom is equipped with the interface that is used for with the tube coupling.
The piston rod of shock attenuation body inserts in the oiliness room, and the grease chamber stretches out and draws back in grease chamber through the shock attenuation pole as the extension of shock attenuation body, plays and passes through the grease chamber extrusion of interface on to other balancing unit with the indoor medium of grease chamber to reach the load between each wheel of balance.
Further inject, the piston rod of the damping body is inserted into one end of the oil chamber and is fixedly connected with a piston, the piston is positioned in the middle of the oil chamber, and the outer wall of the piston is hermetically connected with the inner wall of the oil chamber.
The piston is arranged at the end part of the piston rod of the damping body, and the medium in the oil chamber is conveniently extruded through the piston.
Further inject, the grease chamber is equipped with supporting spring by the shock attenuation body one end, supporting spring overlaps outside the shock attenuation body piston rod, the fixed cover of supporting spring one end is outside the grease chamber, the supporting spring other end and shock attenuation body fixed connection.
The supporting spring supports the oil chamber and the damping body, and the stress critical value of the movement of the piston rod of the damping body in the oil chamber can be increased through the strength of the supporting spring, and meanwhile, the piston rod of the damping body in the oil chamber can be assisted to return; and a certain shock absorption effect can be achieved.
Further inject, all be equipped with the balance lock between two adjacent balance units, the balance lock includes casing and activity slider, the activity slider is located in the casing, activity slider outer wall and shells inner wall be airtight connection, the interface of grease chamber bottom on two adjacent balance units is located through the pipeline intercommunication respectively in the casing both ends, activity slider both sides all are equipped with reset spring, two reset spring both ends are supported respectively and are leaned on activity slider both sides terminal surface and shells both sides inner wall.
The movable sliding block is arranged in the shell, the outer wall of the movable sliding block is connected with the inner wall of the shell in an airtight mode, two sides of the movable sliding block are abutted to two ends of the shell through two reset springs respectively, two sides of the movable sliding block are communicated with interfaces at the bottoms of two adjacent balance unit oil chambers through pipelines, media in the two oil chambers are connected between two sides of the movable sliding block and the shell respectively, the movable sliding block is pushed to move when the media in one oil chamber flows into the shell, the elastic force of the reset spring on one side is overcome when the movable sliding block moves, and the force transmission sensitivity between the oil chambers is reduced.
Further inject, the casing both sides all are equipped with adjusting part, adjusting part includes push pedal, push rod, clamp plate, screw rod and extrusion nut, the push pedal is located between shells inner wall and the reset spring tip, push rod one end pierces through casing lateral wall and push pedal fixed connection, the push rod other end is connected with the clamp plate, the screw rod pierces through the clamp plate and with casing outer wall fixed connection, extrusion nut overlaps and locates the clamp plate outside the screw rod and deviates from casing one side.
The extrusion nut is sleeved outside the screw rod, the pressing plate is pushed to move when the extrusion nut moves axially on the screw rod, then the pushing plate moves inwards through the pushing rod to extrude the end part of the reset spring, the initial expansion degree of the reset spring can be adjusted, and then the movable sliding block is adjusted to overcome the critical value of elastic movement of the reset spring.
Compared with the prior art, when the load of any wheel changes, the medium flows in the pipeline to balance the load of each wheel.
Drawings
The invention is further illustrated by the non-limiting examples given in the accompanying drawings;
FIG. 1 is a schematic diagram of a vehicle balancing system according to the present invention;
FIG. 2 is a schematic structural diagram of a balance lock;
FIG. 3 is a schematic view of the application of the vehicle balancing system of the present invention to a two-wheeled vehicle;
FIG. 4 is a schematic view of the mounting structure of the present invention in a free-standing suspension application;
FIG. 5 is a schematic view of the mounting structure of the present invention in a torsion beam suspension application;
FIG. 6 is a schematic view of the mounting arrangement of the present invention in a rear axle application;
the main element symbols are as follows:
the balance unit 100, the shock absorption body 110, the piston 111, the oil chamber 120, the support spring 200, the balance lock 300, the housing 310, the movable slider 320, the adjustment assembly 330, the push plate 331, the push rod 332, the pressure plate 333, the screw 334, the compression nut 335, the return spring 336 and the oil filling hole 340.
Detailed Description
In order that those skilled in the art can better understand the present invention, the following technical solutions are further described with reference to the accompanying drawings and examples.
As shown in fig. 1, a self-balancing system for a vehicle body comprises at least two balancing units 100 which correspond to wheels one by one and are used for supporting the variable volume between the vehicle body and the wheels, wherein each balancing unit 100 is communicated through a pipeline, and when the load of any wheel changes, a medium flows in the pipeline to balance the load of each wheel.
In this embodiment, when the vehicle travels to a pothole road surface, when one wheel sinks into a pothole, the pressure applied to the sunk wheel is borne by other wheels, and the stress applied to the other wheels is transmitted to the balancing unit 100, and the balancing unit 100 extrudes the media in each wheel to flow to the balancing unit 100 sunk into the wheel so as to prolong the length of the balancing unit 100 sunk into the wheel, so that the media are in contact with the pothole bottom to balance the load of each wheel; when the automobile runs to a convex hull road surface, when one wheel is jacked, the pressure borne by the jacked wheel is increased, media are squeezed to the balancing units 100 of other unstressed wheels through the balancing units 100, and the media pressed into the balancing units 100 of the unstressed wheels in each part support and prolong the length of the balancing units 100 so as to enable the balancing units to be in contact with the road surface, so that the load of each wheel is balanced.
The balance unit 100 comprises a damping body 110 and an oil chamber 120, the oil chamber 120 is sleeved at one end, outside, of a piston rod of the damping body 110, the oil chamber 120 and the piston rod of the damping body 110 are coaxially arranged, and the bottom of the oil chamber 120 is provided with a connector used for being connected with a pipeline.
The piston 111 rod of the damping body 110 is inserted into the oil chamber 120, the oil chamber 120 is used as an extension of the damping body 110, and the damping rod extends and contracts in the oil chamber 120, so that the medium in the oil chamber 120 is extruded to the oil chambers 120 of other balancing units 100 through interfaces, and the load among wheels is balanced.
The piston 111 is fixedly connected to one end of the damping body 110, which is inserted into the oil chamber 120, and the piston 111 is located in the middle of the oil chamber 120 and the outer wall of the piston 111 is hermetically connected with the inner wall of the oil chamber 120.
The damping body 110 is provided with a piston 111 at a piston rod end, and the piston 111 is used for facilitating the extrusion of the medium in the oil chamber 120.
The oil chamber 120 is provided with a supporting spring 200 at one end close to the damping body 110, the supporting spring 200 is sleeved outside the piston rod of the damping body 110, one end of the supporting spring 200 is fixedly sleeved outside the oil chamber 120, and the other end of the supporting spring 200 is fixedly connected with the damping body 110.
The supporting spring 200 supports the oil chamber 120 and the damping body 110, and the strength of the supporting spring 200 can increase the stress critical value of the movement of the piston rod of the damping body 110 in the oil chamber 120 and can assist the piston rod of the damping body 110 in the oil chamber 120 to return; and a certain shock absorption effect can be achieved.
All be equipped with balanced lock 300 between two adjacent balanced units 100, balanced lock 300 includes casing 310 and movable slider 320, movable slider 320 locates in the casing 310, the outer wall of movable slider 320 and casing 310 inner wall be airtight connection, the interface of grease chamber 120 bottom on two adjacent balanced units 100 is located through the pipeline intercommunication respectively in casing 310 both ends, movable slider 320 both sides all are equipped with reset spring 336, two reset spring 336 both ends are supported respectively and are leaned on movable slider 320 both sides terminal surface and casing 310 both sides inner wall.
The movable slider 320 is arranged in the shell 310, the outer wall of the movable slider 320 is hermetically connected with the inner wall of the shell 310, two sides of the movable slider 320 are abutted to two ends of the shell 310 through two return springs 336 respectively, two sides of the movable slider 320 are communicated with interfaces at the bottoms of two adjacent oil chambers of the balancing unit 100 through pipelines, media in the two oil chambers 120 are respectively connected between two sides of the movable slider 320 and the shell 310, the movable slider 320 is pushed to move when the media in one of the oil chambers 120 flows into the shell 310, the elastic force of the return spring 336 on one side is overcome when the movable slider 320 moves, and the force transmission sensitivity between the oil chambers 120 is reduced.
The extrusion nut 335 is sleeved outside the screw 334, when the extrusion nut 335 moves axially on the screw 334, the pressing plate 333 moves, and then the pushing plate 331 moves inwards through the pushing rod 332 to extrude the end of the return spring 336, so that the initial expansion and contraction degree of the return spring 336 can be adjusted, and further the critical value of the movable sliding block 320 moving against the elastic force of the return spring 336 is adjusted.
When the four-wheel vehicle type balancing unit 100 is applied to a four-wheel vehicle type, two balancing units are arranged, and two interfaces are arranged at the bottoms of oil chambers 120 on the four balancing units 100; the four balancing units 100 are connected in series through the interface at the bottom of the oil chamber 120 to form a closed annular oil path.
When one wheel is suspended, the balance units 100 corresponding to other stressed wheels are pressed, the piston 111 at the end part is pushed in the oil chamber 120 through the piston rod of the damping body 110, a medium in the oil chamber 120 is extruded to the suspended wheel, the length of the balance unit 100 of the suspended wheel is extended, meanwhile, the length of the balance unit 100 of the pressed wheel is reduced, the inclination of a vehicle body is reduced, and the load intensity of each wheel is balanced; when one of the wheels is lifted, the pressure of the wheel is increased, and similarly, the balance unit 100 is shortened, and the balance units 100 corresponding to the other wheels are extended, so that the inclination of the vehicle body is reduced, and the load intensity of each wheel is balanced.
As shown in fig. 3, there are two balancing units 100, and the two balancing units 100 are communicated through a pipeline through a port at the bottom of the oil chamber 120.
The mode is applied to a two-wheeled vehicle, the wheels are distributed in a left-right mode, when the left wheels are suspended, the right wheels are pressed to be increased, the piston rod of the damping body 110 corresponding to the right wheels pushes the piston 111 at the pushing end to extrude the medium in the oil chamber 120, the medium is extruded into the oil chamber 120 of the damping body 110 corresponding to the left wheels through the balancing unit 100, and then the piston rod of the damping body 110 on the left side is pushed downwards; at this time, the entire length of the right-side balancing unit 100 is shortened, and the right-side balancing unit 100 is extended, thereby reducing the inclination of the vehicle body and balancing the load strength of the two wheels.
The combination of the two groups of modes can be applied to vehicle types with various wheel numbers, for example, when the combination of the two groups of modes is applied to a six-wheel vehicle type, two front wheels and four rear wheels can be divided into two groups, the two groups of modes are respectively used for connection, and the combination of the two groups of modes can be applied to vehicle types with various wheel numbers; in order to conveniently fill the pipeline connected with the balance lock 300 with hydraulic oil, both ends of the shell 310 are provided with normally closed oil injection holes 340.
Fig. 4, fig. 5 and fig. 6 are schematic views of the installation structure of the design scheme in the independent suspension system, the torsion beam suspension system and the rear axle respectively.
Compared with the prior art, when the load of any wheel changes, the medium flows in the pipeline to balance the load of each wheel.
The vehicle balancing system provided by the present invention has been described in detail above. The description of the specific embodiments is only intended to facilitate an understanding of the method of the invention and its core ideas. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A self-balancing system for a vehicle body, comprising: the vehicle wheel load balancing device comprises at least two balancing units with variable volumes, wherein the balancing units are used for supporting the vehicle body and the wheels, are communicated through pipelines, and flow in the pipelines through media when the load of any wheel changes so as to balance the load of each wheel.
2. The vehicle body self-balancing system of claim 1, wherein: the balance unit comprises a damping body and an oil chamber, the oil chamber is sleeved at one end, outside, of a piston rod of the damping body, the oil chamber is coaxially arranged with the piston rod of the damping body, and an interface used for being connected with a pipeline is arranged at the bottom of the oil chamber.
3. The vehicle body self-balancing system of claim 2, wherein: the balance unit is equipped with two, two balance unit pass through the pipeline intercommunication through the interface of grease chamber bottom.
4. The vehicle body self-balancing system of claim 2, wherein: four balancing units are arranged, and two oil chamber bottom interfaces on the four balancing units are arranged; the four balancing units are connected in series through the interfaces at the bottom of the oil chamber to form a closed annular oil path.
5. The vehicle body self-balancing system according to any one of claims 2 to 4, wherein: the damping body piston rod is inserted into one end of the oil chamber and fixedly connected with a piston, the piston is positioned in the middle of the oil chamber, and the outer wall of the piston is hermetically connected with the inner wall of the oil chamber.
6. The vehicle body self-balancing system of claim 5, wherein: the oil chamber is provided with a supporting spring by one end of the damping body, the supporting spring is sleeved outside a piston rod of the damping body, one end of the supporting spring is fixedly sleeved outside the oil chamber, and the other end of the supporting spring is fixedly connected with the damping body.
7. The vehicle body self-balancing system of claim 6, wherein: and a balance lock is arranged between every two adjacent balance units.
8. The vehicle body self-balancing system of claim 7, wherein: the balance lock comprises a shell and a movable sliding block, the movable sliding block is arranged in the shell, the outer wall of the movable sliding block is connected with the inner wall of the shell in a sealing mode, and the shell is installed on a pipeline between every two adjacent balance units.
9. The vehicle body self-balancing system of claim 8, wherein: and two ends of the reset springs are respectively abutted against the end surfaces on two sides of the movable sliding block and the inner walls on two sides of the shell.
10. The vehicle body self-balancing system of claim 9, wherein: the casing both sides all are equipped with adjusting part, adjusting part includes push pedal, push rod, clamp plate, screw rod and extrusion nut, the push pedal is located between shells inner wall and the reset spring tip, push rod one end pierces through casing lateral wall and push pedal fixed connection, the push rod other end is connected with the clamp plate, the screw rod pierces through the clamp plate and with casing outer wall fixed connection, the extrusion nut cover just locates the clamp plate outside the screw rod and deviates from casing one side.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811216318.8A CN111070989A (en) | 2018-10-18 | 2018-10-18 | Self-balancing system for vehicle body |
| PCT/CN2018/116298 WO2020077729A1 (en) | 2018-10-18 | 2018-11-20 | Self-balancing system for vehicle body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811216318.8A CN111070989A (en) | 2018-10-18 | 2018-10-18 | Self-balancing system for vehicle body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111070989A true CN111070989A (en) | 2020-04-28 |
Family
ID=70283375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811216318.8A Pending CN111070989A (en) | 2018-10-18 | 2018-10-18 | Self-balancing system for vehicle body |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111070989A (en) |
| WO (1) | WO2020077729A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1680126A (en) * | 2004-04-08 | 2005-10-12 | 丰田自动车株式会社 | Vehicle suspension system |
| JP2017140930A (en) * | 2016-02-10 | 2017-08-17 | Ｋｙｂ株式会社 | Suspension device |
| CN209141832U (en) * | 2018-10-18 | 2019-07-23 | 湖北火鑫消防车辆装备有限公司 | Car body voluntarily balance system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1091416B (en) * | 1977-09-16 | 1985-07-06 | Andreoli Angelo | OLEOPNEUMODYNAMIC GROUP FOR ELASTIC SUSPENSIONS IN MOTORCYCLES PARTICULARLY IN OFF-ROAD MOTORCYCLES INTENDED FOR SPORTS COMPETITIONS OF MOTOCROSS AND SIMILAR |
| CN101665067A (en) * | 2009-07-10 | 2010-03-10 | 刘麒 | Air suspension balancing device |
| CN203230782U (en) * | 2013-05-13 | 2013-10-09 | 瑞安市耐迪特汽摩配有限公司 | Shock absorber with regulation device |
| CN105383254A (en) * | 2015-12-04 | 2016-03-09 | 管中林 | Driven suspension circulating interconnection system capable of achieving all-directional pitching prevention |
| CN107882913A (en) * | 2017-12-08 | 2018-04-06 | 畅建坤 | Link damping device |
-
2018
- 2018-10-18 CN CN201811216318.8A patent/CN111070989A/en active Pending
- 2018-11-20 WO PCT/CN2018/116298 patent/WO2020077729A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1680126A (en) * | 2004-04-08 | 2005-10-12 | 丰田自动车株式会社 | Vehicle suspension system |
| JP2017140930A (en) * | 2016-02-10 | 2017-08-17 | Ｋｙｂ株式会社 | Suspension device |
| CN209141832U (en) * | 2018-10-18 | 2019-07-23 | 湖北火鑫消防车辆装备有限公司 | Car body voluntarily balance system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020077729A1 (en) | 2020-04-23 |
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