CN113931944B - Device for preventing forced starting of vehicle for hydrogen fuel vehicle - Google Patents
Device for preventing forced starting of vehicle for hydrogen fuel vehicle Download PDFInfo
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- CN113931944B CN113931944B CN202111287262.7A CN202111287262A CN113931944B CN 113931944 B CN113931944 B CN 113931944B CN 202111287262 A CN202111287262 A CN 202111287262A CN 113931944 B CN113931944 B CN 113931944B
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 27
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 27
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 239000000446 fuel Substances 0.000 title abstract description 21
- 230000008602 contraction Effects 0.000 claims abstract description 17
- 230000003139 buffering effect Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 9
- 230000003068 static effect Effects 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Abstract
The invention discloses a device for preventing a vehicle from being started forcibly for a hydrogen fuel vehicle, which comprises a brake component used for playing a role in braking the vehicle, wherein the brake component is used for preventing the vehicle from being started not by people when the vehicle is stationary; the brake assembly controls a brake switch thereof through cylinder extension driving and cylinder contraction driving, wherein the cylinder extension driving controls the opening of the brake assembly, and the cylinder contraction driving controls the closing of the brake assembly; the cylinder extension drive and the cylinder contraction drive are controlled by a cylinder controller; the cylinder controller is connected with a mechanical switch and an electric switch, wherein the mechanical switch is connected with a cylinder extension drive and a cylinder contraction drive through the cylinder controller, and the electric switch is connected with the cylinder extension drive through the cylinder controller; the invention can effectively ensure the stability of the vehicle when the vehicle is stationary through the brake component, and prevent dangerous accidents caused by the occurrence of non-artificial starting of the vehicle when the vehicle is stationary, thereby effectively improving the safety performance of the hydrogen fuel vehicle when in use.
Description
Technical Field
The invention relates to the technical field of hydrogen fuel automobiles, in particular to a device for preventing forced starting of a vehicle for a hydrogen fuel vehicle.
Background
Hydrogen-fuelled automobiles refer to automobiles that use hydrogen as the primary energy for movement. In general, diesel or gasoline is generally injected into an internal combustion engine, and gaseous hydrogen is used instead in a hydrogen automobile. The fuel cell and the motor can replace a general engine, namely the principle of the hydrogen fuel cell is that hydrogen is input into the fuel cell, electrons of hydrogen atoms are blocked by a proton exchange membrane and are conducted from a negative electrode to a positive electrode through an external circuit to become an electric energy driving motor; protons can be discharged as pure water mist through the proton exchange membrane and oxygen.
Hydrogen is a fuel that can replace petroleum and its combustion products are water and small amounts of nitrogen oxides with little pollution to air. The hydrogen can be prepared in large quantity from the gasification of electrolyzed water and coal, and the large modification of an automobile engine is not needed, so that the hydrogen energy automobile has wide application prospect.
Because of the flammability and explosiveness of hydrogen, it is desirable to ensure that the vehicle is powered off and not moving when fueling a hydrogen-fueled vehicle with hydrogen. At present, in a hydrogen adding station, a vehicle is powered off forcibly before fuel hydrogen is added, including high-voltage power and low-voltage power, but no other measures are taken in the current vehicle to prevent the situation that the vehicle is powered on and the vehicle is forced to start due to accidents, human factors and the like, and the disastrous accidents such as explosion and the like can be caused.
Disclosure of Invention
The invention aims to provide a device for preventing a hydrogen fuel vehicle from being forcedly started, which can effectively ensure the stability of the vehicle when the vehicle is stationary through a brake assembly and prevent dangerous accidents caused by the fact that the vehicle is started in a non-man way when the vehicle is stationary, thereby effectively improving the safety performance of the hydrogen fuel vehicle when the hydrogen fuel vehicle is used.
The aim of the invention can be achieved by the following technical scheme:
A device for preventing the forced starting of a hydrogen-fuelled vehicle comprises a brake assembly for braking the vehicle, wherein the brake assembly is used for preventing the vehicle from being started by no person when the vehicle is stationary;
The brake assembly controls a brake switch thereof through cylinder extension driving and cylinder contraction driving, wherein the cylinder extension driving controls the opening of the brake assembly, and the cylinder contraction driving controls the closing of the brake assembly;
The cylinder extension drive and the cylinder contraction drive are controlled by a cylinder controller;
the cylinder controller is connected with a mechanical switch and an electric switch, wherein the mechanical switch is connected with the cylinder extension drive and the cylinder contraction drive through the cylinder controller, and the electric switch is connected with the cylinder extension drive through the cylinder controller.
As a further scheme of the invention: the electric switch is connected with an information collector, and the information collector is used for collecting vehicle state data.
As a further scheme of the invention: the brake assembly comprises a brake bottom plate, a brake wheel cylinder is sleeved outside the brake bottom plate in a revolving manner, and two groups of brake frames used for limiting the rotation of the brake wheel cylinder are arranged on the brake bottom plate.
As a further scheme of the invention: the brake bottom plate is fixedly provided with a connecting seat, and the two groups of brake frames are arranged on the connecting seat through mounting pieces.
As a further scheme of the invention: and a brake cylinder is arranged on the brake bottom plate, and the output end of the brake cylinder is rotationally connected with the brake frame.
As a further scheme of the invention: and return springs are arranged between the two groups of braking frames and used for rebound and reset of the two groups of braking frames, and two ends of each return spring are respectively connected to the two groups of braking frames.
As a further scheme of the invention: the brake frame is connected with an adjusting spring, the adjusting spring is used for assisting the brake frame to reset and adjust, and one end, far away from the brake frame, of the adjusting spring is connected to the brake bottom plate.
As a further scheme of the invention: the mounting piece comprises a mounting column, the mounting column penetrates through the brake frame, a buffer spring used for playing a buffering role on the brake frame is arranged on the mounting column, and a limit nut used for limiting the buffer spring is arranged on the mounting column in a threaded mode.
As a further scheme of the invention: the braking frame is of an arc-shaped structure, and a braking plate is arranged on the outer side of the braking frame.
As a further scheme of the invention: the brake block comprises a brake plate, and a plurality of limiting protrusions are uniformly arranged on the outer side wall of the brake plate.
The invention has the beneficial effects that:
(1) The stability of the vehicle in the stationary state can be effectively ensured through the brake component, and dangerous accidents caused by the fact that the vehicle is started in an unmanned mode in the stationary state are prevented, so that the safety performance of the hydrogen fuel vehicle in use is effectively improved.
(2) The rotation of the brake cylinder is limited through the friction between the brake frame and the brake cylinder, so that the brake cylinder is ensured to be in a static state, the static braking of the vehicle is realized, and the vehicle is effectively prevented from starting and running.
(3) The buffer spring is utilized to play a certain buffer role on the brake frame, so that the brake frame is effectively prevented from being damaged due to rigid connection when the buffer frame brakes a vehicle, the stability of braking the vehicle is improved on one hand, and the service life of the brake frame is prolonged on the other hand.
(4) The brake pad is arranged to improve the braking effect, the brake pad is made of wear-resistant materials, friction loss is effectively reduced, service life is prolonged, the brake pad is detachably mounted on the brake frame, the braking effect can be recovered only by replacing the brake pad when the braking effect is poor, the whole assembly is not required to be replaced, cost is effectively reduced, a plurality of limit grooves matched with limit protrusions are formed in the inner side of the brake cylinder, the braking effect on a vehicle is improved by utilizing the cooperation of the limit grooves and the limit protrusions, and further the braking stability is effectively improved.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic illustration of the construction of a brake assembly of the present invention;
FIG. 3 is a schematic view of the structure of the mounting of the present invention;
fig. 4 is a schematic structural view of a brake pad of the present invention.
In the figure: 10. a cylinder controller; 20. an electric switch; 30. an information collector; 40. a mechanical switch; 50. the cylinder is driven in an extending way; 60. the cylinder is driven in a shrinkage way; 70. a brake assembly; 71. a brake pad; 72. braking wheel cylinders; 73. a brake cylinder; 74. a brake frame; 75. a brake pad; 751. a brake plate; 752. a limit protrusion; 76. a connecting seat; 77. a mounting member; 771. a mounting column; 772. a buffer spring; 773. a spring pressing plate; 774. a limit nut; 78. a return spring; 79. an adjusting spring; 710. and controlling the gas tank.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention is a device for preventing forced starting of a hydrogen-fuelled vehicle, comprising a brake assembly 70 for braking the vehicle, wherein the brake assembly 70 is used for preventing the vehicle from being started by no person when the vehicle is stationary; the brake assembly 70 controls a brake switch thereof through the cylinder extension drive 50 and the cylinder contraction drive 60, wherein the cylinder extension drive 50 controls the opening of the brake assembly 70, and the cylinder contraction drive 60 controls the closing of the brake assembly 70; the cylinder extension drive 50 and the cylinder contraction drive 60 are drive-controlled by the cylinder controller 10; the cylinder controller 10 is connected with a mechanical switch 40 and an electric switch 20, wherein the mechanical switch 40 is connected with the cylinder extension drive 50 and the cylinder contraction drive 60 through the cylinder controller 10, and the electric switch 20 is connected with the cylinder extension drive 50 through the cylinder controller 10. The electric switch 20 is connected with an information collector 30, and the information collector 30 is used for collecting vehicle state data.
When the hydrogen fuel vehicle is fuelled, it is required to ensure that the vehicle is powered off and does not move, so that a device for preventing the vehicle from being forced to start is required to ensure that the vehicle is kept in a stationary state, because the vehicle is started to cause dangerous accidents when the hydrogen fuel is added, the information collector 30 collects state information of the vehicle in real time, the information collector 30 is given a braking information when the vehicle is stationary and waiting for the fuel to be added, the information collector 30 sends the information to the electric switch 20, a braking signal is sent to the cylinder controller 10 through the electric switch 20, the cylinder extension drive 50 is started by the cylinder controller 10, the cylinder extension drive 50 controls the brake assembly 70 to brake the vehicle, and independent connection is adopted between the electric switch 20 and the cylinder controller 10 and the cylinder extension drive 50, namely, the electric switch 20 only can control the cylinder extension drive 50 to start the brake assembly 70, but cannot control the vehicle to stop the braking, and therefore the situation that the vehicle is started due to the non-artificial braking closure caused by the system fault cannot occur.
When the fuel adding of the vehicle is completed, the mechanical switch 40 is used for controlling the cylinder controller 10, and the cylinder controller 10 is used for controlling the cylinder shrinkage driving 60, so that the brake assembly 70 is driven to be converted into the closed state from the open state, the brake assembly 70 releases the brake control of the vehicle, and the vehicle can be ensured to normally start to run after the fuel adding is completed. And the mechanical switch 40 is also connected with the cylinder extension drive 50 through the cylinder controller 10, and can realize the manual opening and closing of the vehicle brake through the mechanical switch 40, so that the opening and closing of the vehicle brake can be realized when the electric control system fails, and the safety performance of the vehicle is ensured.
Referring to fig. 2, the brake assembly 70 includes a brake bottom plate 71, a brake cylinder 72 is rotatably sleeved on the brake bottom plate 71, and two sets of brake frames 74 for restricting rotation of the brake cylinder 72 are disposed on the brake bottom plate 71. The brake bottom plate 71 is fixedly provided with a connecting seat 76, and two groups of brake frames 74 are mounted on the connecting seat 76 through mounting pieces 77. The brake bottom plate 71 is provided with a brake cylinder 73, the output end of the brake cylinder 73 is rotatably connected with a brake frame 74, and the brake bottom plate 71 is also provided with a control air tank 710, and the control air tank 710 is used for providing an air source for the brake cylinder 73 so as to ensure that the brake cylinder 73 can be normally and stably opened and closed.
The cylinder controller 10 controls the brake cylinder 73 to work, when the brake cylinder 73 stretches under the action of the cylinder stretching drive 50, the output end of the brake cylinder 73 drives two groups of brake frames 74 to rotate outwards, the brake cylinder 73 does not shrink and recover after stretching, the two groups of brake frames 74 rotate to be attached to the inner side wall of the brake cylinder 72, the rotation of the brake cylinder 72 is limited through the friction between the brake frames 74 and the brake cylinder 72, the brake cylinder 72 is ensured to be in a static state, and therefore static braking of a vehicle is achieved, and starting running of the vehicle is effectively prevented.
When the mechanical switch 40 controls the cylinder contraction driving 60 to act on the brake cylinder 73 through the cylinder controller 10, the output end of the brake cylinder 73 contracts to drive the brake frame 74 to rotate inwards, so that the brake frame 74 releases the brake limit on the brake cylinder 72, and the vehicle is ensured to be in a state capable of starting running.
A return spring 78 is arranged between the two groups of brake frames 74, the return spring 78 is used for rebound and reset of the two groups of brake frames 74, two ends of the return spring 78 are respectively connected to the two groups of brake frames 74, at least two groups of return springs 78 are respectively arranged at two ends of the brake frames 74, when the brake frames 74 rotate outwards to brake the brake wheel cylinders 72, the return spring 78 is in a stretching state, and when braking is canceled, the return spring 78 is reset. The brake frame 74 is connected with an adjusting spring 79, the adjusting spring 79 is used for assisting the brake frame 74 to carry out reset adjustment, one end, far away from the brake frame 74, of the adjusting spring 79 is connected to the brake bottom plate 71, and similarly, the adjusting spring 79 is used for assisting the reset of the brake frame 74, so that the brake frame 74 is ensured to be reset accurately during non-braking.
Referring to fig. 3, the mounting member 77 includes a mounting post 771, the mounting post 771 penetrates through the brake frame 74, a buffer spring 772 for buffering the brake frame 74 is provided on the mounting post 771, a limit nut 774 for limiting the buffer spring 772 is mounted on the mounting post 771 in a threaded manner, a spring pressing plate 773 is provided between the buffer spring 772 and the limit nut 774, the limit nut 774 is ensured to stably mount and limit the buffer spring 772, the brake frame 74 is mounted through the mounting post 771, and the buffer spring 772 is utilized to play a certain role in buffering the brake frame 74, so that the brake frame 74 is effectively prevented from being damaged due to rigid connection when the brake frame brakes a vehicle, on one hand, the stability of braking the vehicle is improved, and on the other hand, the service life of the brake frame 74 is prolonged.
Referring to fig. 4, the brake frame 74 has an arc-shaped structure, and a brake pad 75 is disposed on the outer side of the brake frame 74. The brake block 75 includes the brake block 751, evenly be provided with a plurality of spacing archs 752 on the brake block 751 lateral wall, the brake frame 74 of arc structure improves the laminating degree with brake cylinder 72, thereby improve the braking effect to the vehicle, and improve the braking effect through setting up brake block 75, brake block 75 is made with wear-resisting material earlier, effectively reduce friction loss and improve life, and brake block 75 demountable installation is on brake frame 74, only need change the recovery of braking effect just can be realized to brake block 75 when the braking effect is not good, and need not to change whole subassembly, effectively reduce cost, simultaneously set up a plurality of spacing grooves with spacing arch 752 matched with in the inboard of brake cylinder 72, utilize spacing groove and spacing protruding 752's cooperation to improve the braking effect to the vehicle, and then effectively improve the stability of braking.
The working principle of the invention is as follows: when the vehicle is in a static state and fuel is to be added, the information collector 30 is given a braking information, the information collector 30 sends the information to the electric switch 20, a braking signal is sent to the air cylinder controller 10 through the electric switch 20, the air cylinder controller 10 is utilized to start the air cylinder extension drive 50, the air cylinder extension drive 50 is used for controlling the brake assembly 70 to brake the vehicle, the air cylinder controller 10 is used for controlling the brake air cylinder 73 to work, when the brake air cylinder 73 is extended under the action of the air cylinder extension drive 50, the output end of the brake air cylinder 73 drives the two groups of brake frames 74 to rotate outwards, the brake air cylinder 73 is not contracted to recover after being extended, the two groups of brake frames 74 rotate to be attached to the inner side wall of the brake cylinder 72, the rotation of the brake cylinder 72 is limited through the friction between the brake frames 74 and the brake cylinder 72, the static state of the brake cylinder 72 is ensured, therefore the static braking of the vehicle is achieved, the vehicle is effectively prevented from starting and running, and the electric switch 20 is independently connected with the air cylinder controller 10 and the air cylinder extension drive 50, namely the electric switch 20 is only controlled to only to start the air cylinder extension drive 50, the brake assembly 70 can not be started, the vehicle cannot be braked and closed, and the vehicle cannot be braked, and the system cannot be closed due to the fact that the system is not started and is not started due to faults.
When the vehicle is completely fueled, the mechanical switch 40 is used for controlling the cylinder controller 10, the cylinder controller 10 is used for controlling the cylinder shrinkage driving 60, so that the brake assembly 70 is driven to be converted into the closed state from the open state, the brake assembly 70 releases the brake control on the vehicle, when the mechanical switch 40 is used for controlling the cylinder shrinkage driving 60 to act on the brake cylinder 73, the output end of the brake cylinder 73 is shrunk to drive the brake frame 74 to rotate inwards, the brake frame 74 releases the brake limit on the brake cylinder 72, and the vehicle is ensured to be in a state capable of starting running. And the mechanical switch 40 is also connected with the cylinder extension drive 50 through the cylinder controller 10, and can realize the manual opening and closing of the vehicle brake through the mechanical switch 40, so that the opening and closing of the vehicle brake can be realized when the electric control system fails, and the safety performance of the vehicle is ensured.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (4)
1. A device for preventing forced starting of a hydrogen fuelled vehicle comprising a brake assembly (70) for braking the vehicle, the brake assembly (70) being adapted to prevent non-human starting of the vehicle when stationary;
The brake assembly (70) controls a brake switch of the brake assembly through a cylinder extension drive (50) and a cylinder contraction drive (60), wherein the cylinder extension drive (50) controls the brake assembly (70) to be started, and the cylinder contraction drive (60) controls the brake assembly (70) to be closed;
the cylinder extension drive (50) and the cylinder contraction drive (60) are controlled in a driving way through a cylinder controller (10);
The cylinder controller (10) is connected with a mechanical switch (40) and an electric switch (20), wherein the mechanical switch (40) is connected with a cylinder extension drive (50) and a cylinder contraction drive (60) through the cylinder controller (10), and the electric switch (20) is connected with the cylinder extension drive (50) through the cylinder controller (10);
The brake assembly (70) comprises a brake bottom plate (71), a brake wheel cylinder (72) is sleeved outside the brake bottom plate (71) in a rotating manner, and two groups of brake frames (74) for limiting the rotation of the brake wheel cylinder (72) are arranged on the brake bottom plate (71);
a connecting seat (76) is fixedly arranged on the brake bottom plate (71), and two groups of brake frames (74) are arranged on the connecting seat (76) through mounting pieces (77);
a brake cylinder (73) is arranged on the brake bottom plate (71), and the output end of the brake cylinder (73) is rotationally connected with a brake frame (74);
A return spring (78) is arranged between the two groups of brake frames (74), and the return spring (78) is used for rebound and reset of the two groups of brake frames (74);
An adjusting spring (79) is connected to the brake frame (74), and the adjusting spring (79) is used for assisting the brake frame (74) in resetting adjustment;
The mounting piece (77) comprises a mounting column (771), the mounting column (771) penetrates through the brake frame (74), a buffer spring (772) used for buffering the brake frame (74) is arranged on the mounting column (771), and a limit nut (774) used for limiting the buffer spring (772) is mounted on the mounting column (771) in a threaded mode.
2. The device for preventing forcible starting of a hydrogen fueled vehicle according to claim 1, wherein the electric switch (20) is connected with an information collector (30), and the information collector (30) is used for collecting vehicle state data.
3. The device for preventing forcible starting of a hydrogen fuelled vehicle as claimed in claim 1 wherein said brake frame (74) has an arcuate structure, and a brake pad (75) is provided outside the brake frame (74).
4. A device for preventing forcible starting of a vehicle for a hydrogen-fueled vehicle according to claim 3, wherein the brake pad (75) comprises a brake plate (751), and a plurality of stopper projections (752) are uniformly provided on an outer side wall of the brake plate (751).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111287262.7A CN113931944B (en) | 2021-11-02 | Device for preventing forced starting of vehicle for hydrogen fuel vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111287262.7A CN113931944B (en) | 2021-11-02 | Device for preventing forced starting of vehicle for hydrogen fuel vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113931944A CN113931944A (en) | 2022-01-14 |
| CN113931944B true CN113931944B (en) | 2024-07-19 |
Family
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200945861Y (en) * | 2005-08-09 | 2007-09-12 | 杨铭域 | Carriage safe full-automatic parking brake system |
| CN204293562U (en) * | 2014-10-16 | 2015-04-29 | 赵宣玉 | General-purpose type essential oil diffusion instrument |
| CN209892657U (en) * | 2019-02-18 | 2020-01-03 | 徐氏巨龙(江苏)科技有限公司 | Drum brake braking device for electric vehicle |
| CN211550338U (en) * | 2019-10-14 | 2020-09-22 | 长春工业大学 | Wedge type brake for large vehicle |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200945861Y (en) * | 2005-08-09 | 2007-09-12 | 杨铭域 | Carriage safe full-automatic parking brake system |
| CN204293562U (en) * | 2014-10-16 | 2015-04-29 | 赵宣玉 | General-purpose type essential oil diffusion instrument |
| CN209892657U (en) * | 2019-02-18 | 2020-01-03 | 徐氏巨龙(江苏)科技有限公司 | Drum brake braking device for electric vehicle |
| CN211550338U (en) * | 2019-10-14 | 2020-09-22 | 长春工业大学 | Wedge type brake for large vehicle |
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