CN209972427U - Vehicle electronic parking braking power device and vehicle electronic parking braking system - Google Patents

Vehicle electronic parking braking power device and vehicle electronic parking braking system Download PDF

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Publication number
CN209972427U
CN209972427U CN201920179463.7U CN201920179463U CN209972427U CN 209972427 U CN209972427 U CN 209972427U CN 201920179463 U CN201920179463 U CN 201920179463U CN 209972427 U CN209972427 U CN 209972427U
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CN
China
Prior art keywords
power device
electronic parking
lead screw
parking brake
gear reduction
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Application number
CN201920179463.7U
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Chinese (zh)
Inventor
刘晓莹
蔡伟
郑利水
张红波
姚兴娟
陈鹏飞
袁炳
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Zhejiang Asia Pacific Mechanical and Electronic Co Ltd
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Zhejiang Asia Pacific Mechanical and Electronic Co Ltd
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Priority to CN201920179463.7U priority Critical patent/CN209972427U/en
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Abstract

The utility model discloses a vehicle electron parking braking power device and vehicle electron parking braking system, belong to vehicle parking braking equipment field, power device includes the shell, be equipped with the motor in the shell, lead screw and drive mechanism, the lead screw is rotatable to be located in the shell, the front end of lead screw is equipped with the single arm-drag that stretches out the shell, the motor passes through drive mechanism drive lead screw and realizes braking or realize the release along the axial antedisplacement along the axial backshifting, drive mechanism includes the gear reduction structure, the gear reduction structure is equipped with at least two-stage transmission structure, the motor passes through gear reduction structure drive lead screw and follows axial round trip movement. The vehicle electronic parking brake system comprises the power device and the brake. Through the mode of increasing the gear reduction structure transmission progression, increase gear reduction structure's speed reduction drive ratio, reduce the size of concrete component, reduce the whole required installation space of power device when improving gear reduction structure transmission precision, be favorable to improving the braking effect when parking braking.

Description

Vehicle electronic parking braking power device and vehicle electronic parking braking system
Technical Field
The utility model relates to a vehicle parking braking equipment technical field especially relates to a vehicle electron parking braking power device, in addition, the utility model discloses still relate to the vehicle electron parking braking system who adopts this kind of vehicle electron parking braking power device.
Background
The parking brake is a device for stopping a vehicle to prevent the vehicle from moving when the vehicle is parked, and for holding wheels of the vehicle to prevent the wheels from rotating. With the continuous progress of automobile technology, more and more automobile control systems are gradually changed from a traditional mechanical control mode to an electronic control mode, and the electronic parking brake system is the concrete embodiment of applying electronic control to vehicles. Compared with a mechanical control parking braking system, the electronic parking braking system not only improves the parking safety, but also can be combined with other electric control systems of the vehicle, and is favorable for realizing the integral intelligent control of the vehicle.
The existing electronic parking braking system generally adopts a rear embedded integrated electronic parking braking structure, power is derived from a motor, and parking braking and releasing of a vehicle are realized through a brake through a transmission device. The transmission device generally adopts a pull rod type structure, and the motor drives the pull rod type structure to move back and forth through a gear structure. However, the control precision of the existing electronic parking brake system is low, and the control requirement of vehicle parking brake cannot be well met.
SUMMERY OF THE UTILITY MODEL
In order to solve the shortcoming and the deficiency that exist among the above-mentioned prior art, the utility model provides a effectual vehicle electron parking braking power device brakes.
In order to realize above-mentioned technical purpose, the utility model provides a vehicle electron parking braking power device, including the shell, be equipped with motor, lead screw and drive mechanism in the shell, the lead screw is rotatable locate in the shell, and the front end of lead screw is equipped with the single arm-drag that stretches out the shell, and the motor passes through drive mechanism drive lead screw and realizes the braking or realize the release along the axial antedisplacement along the axial rearward displacement, drive mechanism includes gear reduction structure, and gear reduction structure is equipped with at least two-stage transmission structure, and the motor passes through gear reduction structure drive lead screw and follows axial round trip movement.
Preferably, gear reduction structure is equipped with two-stage transmission structure, including one-level action wheel, one-level from driving wheel, second grade action wheel, second grade from driving wheel and pivot, the pivot is rotatable to be located in the shell, and the motor includes the motor shaft, and on the motor shaft was located to the one-level action wheel cover, the one-level was located pivot one end from the driving wheel cover and was just meshed with the one-level action wheel, and the pivot other end was located to the second grade action wheel cover, and the second grade is located on the lead.
Preferably, the motor shaft and the rotating shaft are arranged in parallel, the rotating shaft and the screw rod are arranged vertically, and the secondary driving wheel and the secondary driven wheel are matched through a bevel gear or a bevel gear.
Preferably, the transmission mechanism further comprises a transmission nut, the transmission nut is sleeved on the screw rod through thread fit, and the transmission nut is fixedly connected to the secondary driven wheel.
Preferably, the transmission nut is connected to the secondary driven wheel through thread fit, and thread locking glue is coated between the transmission nut and the secondary driven wheel.
Preferably, still be equipped with spacing seat and elastic component in the shell, the fixed rear side that lies in drive nut on locating the lead screw of spacing seat cover, the elastic component cover is located on the lead screw and is located spacing seat, and the rear end of elastic component contacts the inner wall, the front end that contact in spacing seat in drive nut of spacing seat.
Preferably, the transmission nut is rotatably erected in the shell through at least one bearing, the bearing sleeve is arranged outside the transmission nut, and the other end of the elastic element abuts against one of the bearings to realize contact with the transmission nut.
Preferably, the rear end part of the screw rod is provided with a limiting part, the shell is provided with a limiting groove matched with the limiting part, and a non-circular matching structure is adopted between the limiting part and the limiting groove.
The utility model also provides a vehicle electron parking braking system, include electron parking braking power device and connect in electron parking braking power device's stopper, electron parking braking power device adopts aforementioned vehicle electron parking braking power device.
Preferably, the brake is a drum brake.
After the technical scheme is adopted, the utility model has the advantages of as follows:
1. the utility model provides a vehicle electron parking braking power device, concrete structure to current electron parking braking power device has improved, drive mechanism is including the gear reduction structure that is equipped with at least two-stage transmission structure, mode through increasing gear reduction structure transmission progression, can not only increase the speed reduction ratio of gear reduction structure, can also reduce the size of the concrete component of gear reduction structure, can effectively reduce the whole required installation space of power device when improving gear reduction structure transmission precision, braking effect when being favorable to improving parking braking.
2. The gear reduction structure adopts a two-stage transmission structure, the specific transmission stage number of the gear reduction structure is reasonably set, the specific structure of the gear reduction structure is simplified as much as possible on the premise of meeting the transmission requirement, and the assembly efficiency is favorably improved and the production cost is reduced.
3. The motor and the rotating shaft are arranged in parallel, the rotating shaft and the screw rod are arranged perpendicularly, perpendicular transmission is achieved between the rotating shaft and the screw rod through the cooperation of the bevel gears or the cooperation of the bevel gears, the arrangement modes between the components are reasonably arranged, transmission torque can be increased, the transmission direction of the motor torque can be changed, the motor, the gear reduction structure and the axial length of the screw rod are favorably reduced, and therefore the whole required installation space of the power device is favorably further reduced.
4. The transmission mechanism further comprises a transmission nut, the transmission nut is arranged between the output end of the gear transmission structure and the lead screw and used for transmitting power, the stability and the accuracy of the transmission mechanism for driving the lead screw to move back and forth are improved, and the working requirement during parking braking is better met.
5. The transmission nut and the secondary driven wheel are connected through thread matching, complete fixed connection between the transmission nut and the secondary driven wheel is achieved through thread locking glue, the matching structure between the transmission nut and the secondary driven wheel is simple, assembly efficiency is improved beneficially, and fixing strength between the transmission nut and the secondary driven wheel can meet working requirements through the thread locking glue.
6. The elastic piece can play the cushioning effect, under the elastic force effect of elastic piece, can effectively avoid leading to the dead condition of lock because of the tight butt of the screw fitting surface between transmission nut and the lead screw together, can drive the lead screw through drive mechanism smoothly and follow axial round trip movement when making the motor work. In addition, when the power device executes the action of releasing the brake, the initial acting force for executing the release can be effectively reduced through the elastic force of the elastic piece. And moreover, under the condition that no built-in sensor is arranged, the control element can judge whether the release is completed or not according to the characteristic that the load of the motor is changed by the elastic part so as to change the current of the motor, when the screw rod continues to move forwards along the axial direction after completing the stroke of movement required by the release action, the elastic part is stressed and compressed, the load of the motor is increased, the current of the motor is also increased, and the control element can judge whether the release action is completed or not according to the change condition of the current of the motor.
7. The non-circular matching structure between the limiting part and the limiting groove is used for limiting the screw rod in the circumferential direction, the screw rod can only move in the axial direction under the driving of the motor and cannot rotate in the circumferential direction, the stability of the screw rod in the axial direction moving back and forth is improved, and the parking and releasing stability is improved.
8. The utility model provides a vehicle electron parking braking system adopts the vehicle electron parking braking power device of above-mentioned record, and the transmission precision of gear reduction structure effectively improves, is favorable to improving the holistic braking effect of braking system, in addition, can also effectively reduce the required installation space of power device.
Drawings
FIG. 1 is an exploded view of an electric parking brake power plant of a vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic view of a left housing of an electric parking brake power device of a vehicle according to an embodiment of the present invention;
fig. 3 is a schematic view of a motor, a transmission mechanism and a lead screw in an electric parking brake power device of a vehicle according to an embodiment of the present invention;
fig. 4 is an exploded view of a motor, a transmission mechanism and a lead screw in an electric parking brake power device of a vehicle according to an embodiment of the present invention;
fig. 5 is a cross-sectional view of a partial structure of a vehicle electronic parking brake power device according to an embodiment of the present invention along an axial direction of a screw rod.
In the figure, 1-shell, 11-left shell, 12-right shell, 13-accommodating groove, 14-groove, 15-limiting groove, 16-boss, 2-motor, 21-motor shaft, 3-screw rod, 31-pull arm, 32-connector, 33-limiting part, 41-primary driving wheel, 42-primary driven wheel, 43-secondary driving wheel, 44-secondary driven wheel, 441-connecting hole, 45-rotating shaft, 5-transmission nut, 51-limiting convex edge, 52-limiting step surface, 61-first bearing, 62-second bearing, 63-third bearing and 64-bushing.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments. It is to be understood that the following terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," "bottom," and the like are used in an orientation or positional relationship relative to one another only as illustrated in the accompanying drawings and are used merely for convenience in describing and simplifying the invention, and do not indicate or imply that the device/component so referred to must have a particular orientation or be constructed and operated in a particular orientation and therefore should not be considered as limiting the invention.
Example one
As shown in fig. 1 to 5, a pair of vehicle electronic parking braking power device provided by the embodiment of the utility model provides, including shell 1, be equipped with motor 2, lead screw 3 and drive mechanism in the shell 1, in lead screw 3 is rotatable to be located shell 1, the front end of lead screw 3 is equipped with the arm-drag 31 that stretches out shell 1, and motor 2 passes through drive mechanism drive lead screw 3 and realizes braking or realize the release along axial antedisplacement along the axial rearward movement. The transmission mechanism comprises a gear reduction structure, the gear reduction structure is provided with at least two stages of transmission structures, and the motor drives the screw rod 3 to move back and forth along the axial direction through the gear reduction structure.
Through the mode of increasing the gear reduction structure transmission progression, can not only increase the speed reduction drive ratio of gear reduction structure, can also reduce the size of the concrete component of gear reduction structure, can effectively reduce the whole required installation space of power device when improving gear reduction structure transmission precision, braking effect when being favorable to improving parking braking.
In this embodiment, shell 1 includes left casing 11 and right casing 12 that fixed connection is in the same place, all is equipped with the holding tank 13 that is used for installing motor 2 on the inner wall of left casing 11 and right casing 12, and two holding tanks 13 make up the chamber that holds that is used for holding motor 2 when left casing 11 and right casing 12 link together. For connection to the brake, the pull arm 31 is provided with a connection head 32 at the end remote from the spindle 3.
In order to simplify the specific structure of the gear reduction structure as much as possible on the premise of meeting the transmission requirement, in this embodiment, the gear reduction structure is provided with a two-stage transmission structure, which includes a first-stage driving wheel 41, a first-stage driven wheel 42, a second-stage driving wheel 43, a second-stage driven wheel 44 and a rotating shaft 45. The rotating shaft 45 is rotatably disposed in the housing 1, and in the embodiment, one end of the rotating shaft 45 is rotatably mounted in the housing 1 through the first bearing 61, and the other end is rotatably mounted in the housing 1 through the bushing 64. The motor 2 includes motor shaft 21, and one-level action wheel 41 is located on motor shaft 21 through the fixed cover of shaft hole cooperation, and the one-level is followed fixed cover of shaft hole cooperation and is located the one end of pivot 45 and mesh with one-level action wheel 41 from driving wheel 42, and the other end of pivot 45 is located through the fixed cover of shaft hole cooperation to second grade action wheel 43, and the second grade is followed the cover of driving wheel 44 and is located on the lead screw 3 and mesh with second grade action.
In order to reasonably reduce the profile gear of the power device, the motor shaft 21 is arranged in parallel with the rotating shaft 45, and the rotating shaft 45 is arranged perpendicular to the screw rod 3. The reasonable arrangement mode between each component that sets up not only can increase the transmission moment of torsion, can also change the direction of transfer of motor moment of torsion, is favorable to reducing motor, gear reduction structure and the axial length of lead screw. Specifically, in this embodiment, a spur gear is preferably used for the first-stage driving wheel 41 and the first-stage driven wheel 42, the reduction ratio between the first-stage driven wheel and the first-stage driving wheel is preferably set to 4, a helical gear is preferably used for the second-stage driving wheel 43 and the second-stage driven wheel 44, that is, the first-stage driving wheel 41 and the first-stage driven wheel 42 are spur gears, the second-stage driving wheel 43 and the second-stage driven wheel 44 are helical gears, and the reduction ratio between the second-stage driven wheel and the second-.
In order to ensure the stability and accuracy of the transmission mechanism driving the screw rod 3 to move back and forth, the transmission mechanism further comprises a transmission nut 5, the transmission nut 5 is sleeved on the screw rod 3 through thread fit, and the transmission nut 5 is fixedly connected to the secondary driven wheel 44. Specifically, in this embodiment, the second-stage driven wheel 44 is provided with a connecting hole 441 at the axis, the diameter of which is larger than the outer diameter of the transmission nut 5, an inner thread is provided on the inner wall of the connecting hole 441, an outer thread is provided on the outer wall of the transmission nut 5, the transmission nut 5 is sleeved on the screw rod 3 through a thread fit, and meanwhile, the transmission nut 5 is connected to the connecting hole 441 of the second-stage driven wheel 44 through a thread fit between the outer thread and the inner thread. In order to improve the connection strength between the transmission nut 5 and the secondary driven wheel 44, a thread locking glue is coated between the transmission nut 5 and the secondary driven wheel 44.
In the rotatable shell 1 that locates of drive nut 5 passes through the bearing, in this embodiment, in order to improve the stability when drive nut 5 rotates, drive nut 5 realizes rotatable the installation in shell 1 through two bearings of second bearing 62 and third bearing 63, second bearing 62 is located the second grade and follows the front side of driving wheel 44, third bearing 63 is located the second grade and follows the rear side of driving wheel 44, be equipped with the mounting groove that is used for installing first bearing 61 on the inner wall of left casing 11 and right casing 12, second bearing 62, third bearing 63 and bush.
In order to realize the axial limit of the second bearing 62 and the third bearing 63, a circle of limit convex edge 51 is arranged at the front end of the transmission nut 5, a circle of limit step surface 52 is arranged at the rear end of the transmission nut 5, and an external thread matched with the secondary driven wheel 44 on the transmission nut 5 is arranged between the limit convex edge 51 and the limit step surface 52.
In order to avoid the locking of the transmission nut 5 and the screw rod 3, a limiting seat 71 and an elastic piece are further arranged in the shell 1, the limiting seat 71 is fixedly sleeved on the screw rod 3 and is located on the rear side of the transmission nut 5, the elastic piece is sleeved on the screw rod 3 and is located in the limiting seat 71, the rear end of the elastic piece is contacted with the inner wall of the limiting seat, and the front end of the elastic piece is contacted with the transmission nut 5.
In this embodiment, the limiting seat 71 is fixedly sleeved on the screw rod 3 through the shaft hole in a matching manner, the elastic member is a plurality of disc springs 72 distributed side by side, the disc springs 72 are sleeved on the screw rod 3 through a clearance fit and are located in the concave cavities on the limiting seat 71, the rear ends of the disc springs 72 are abutted against the inner wall of the limiting seat 71, and the front ends of the disc springs 72 are abutted against the third bearing 63 to realize contact with the transmission nut 5. In order to prevent the disc spring 72 from interfering with the rotation of the third bearing 63, a needle bearing is preferably used as the third bearing 63, and a deep groove ball bearing is preferably used as the second bearing 62. In order to improve the stability of the limiting seat 71, a groove 14 matched with the limiting seat 71 is formed on the inner wall of the left shell 11, and the limiting seat is in clearance fit with the groove 14.
In order to prevent the screw rod 3 from rotating in the circumferential direction when moving back and forth, the rear end of the screw rod 3 is provided with a limiting part 33, the left shell 11 is provided with a limiting groove 15 matched with the limiting part 33, and a non-circular matching structure is adopted between the limiting part 33 and the limiting groove 15. The non-circular matching structure between the limiting part 33 and the limiting groove 15 enables the screw rod 3 to only translate along the axial direction under the driving of the motor 2 without rotating along the circumferential direction, and the stability of the screw rod 3 in the axial direction moving back and forth is improved. In the present embodiment, the limiting portion 33 is a spline, the limiting groove 15 is a spline groove, the left housing 11 is provided with a boss 16 protruding outward, and the limiting groove 15 is provided on the boss 16.
The embodiment also provides a vehicle electronic parking brake system, which comprises an electronic parking brake power device and a brake connected to the electronic parking brake power device, wherein the electronic parking brake power device adopts the vehicle electronic parking brake power device. In this embodiment, the brake is a drum brake, and the drum brake is connected to the connector 32 at the front end of the screw rod 3 through a cable.
When the electronic parking braking power device for the vehicle is used for realizing parking braking, the motor 2 is electrified to rotate forwards, the motor shaft 21 drives the screw rod 3 to move backwards along the axial direction through the primary driving wheel 41, the primary driven wheel 42, the rotating shaft 45, the secondary driving wheel 43, the secondary driven wheel 44 and the transmission nut 5, the pull arm 31 also moves backwards along the axial direction, the inhaul cable is tensioned, and the drum brake is driven to tightly hold the wheel, so that the parking braking is realized.
When the parking release is performed, the motor 2 is electrified and reversely rotated, the motor shaft 21 drives the screw rod 3 to move forwards along the axial direction through the primary driving wheel 41, the primary driven wheel 42, the rotating shaft 45, the secondary driving wheel 43, the secondary driven wheel 44 and the transmission nut 5, the pull arm 31 also moves forwards along the axial direction, the inhaul cable is released, and the drum brake releases the wheels to realize the release.
Under the condition that no built-in sensor is arranged, a control element of the vehicle electronic parking brake system can judge whether the release is completed or not according to the characteristic that the load of the motor 2 is changed by the belleville spring 72 so as to change the current of the motor, when the screw rod 3 continues to move forwards along the axial direction after completing the travel required by the release action, the belleville spring 72 is stressed and compressed, the load of the motor 2 is increased, the current of the motor 2 is increased accordingly, and the control element can judge whether the release action is completed or not according to the change condition of the current of the motor.
It will be appreciated that other engagement means between the primary driving pulley 41 and the primary driven pulley 42 may be used, such as a herringbone gear engagement structure.
It is understood that a bevel gear matching structure can be adopted between the secondary driving wheel 43 and the secondary driven wheel 44.
It is understood that the secondary driven wheel 44 can also directly drive the screw rod 3 to move back and forth along the axial direction through the thread fit without providing the transmission nut 5.
It will be appreciated that the resilient member may also be a spring.
It can be understood that the reduction ratio between the first-stage driven wheel and the first-stage driving wheel and the reduction ratio between the second-stage driven wheel and the second-stage driving wheel are not limited to the above description, and the reduction ratios are reasonably set to meet the transmission requirement.
In addition to the above preferred embodiments, the present invention has other embodiments, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, which should fall within the scope defined by the appended claims.

Claims (10)

1. The utility model provides a vehicle electron parking braking power device, includes the shell, is equipped with motor, lead screw and drive mechanism in the shell, and the lead screw is rotatable to be located in the shell, and the front end of lead screw is equipped with the single arm-drag that stretches out the shell, and the motor passes through drive mechanism drive lead screw and realizes braking or realize the release along the axial antedisplacement along the axial rearward displacement, its characterized in that, drive mechanism includes gear reduction structure, and gear reduction structure is equipped with at least two-stage transmission structure, and the motor passes through gear reduction structure drive lead screw and follows the axial round trip movement.
2. The vehicle electronic parking brake power device according to claim 1, wherein the gear reduction structure is provided with a two-stage transmission structure including a first-stage driving wheel, a first-stage driven wheel, a second-stage driving wheel, a second-stage driven wheel and a rotating shaft, the rotating shaft is rotatably disposed in the housing, the motor includes a motor shaft, the first-stage driving wheel is sleeved on the motor shaft, the first-stage driven wheel is sleeved on one end of the rotating shaft and meshed with the first-stage driving wheel, the second-stage driving wheel is sleeved on the other end of the rotating shaft, and the second-stage driven wheel is sleeved.
3. The vehicle electronic parking brake power device according to claim 2, wherein the motor shaft is arranged in parallel with the rotating shaft, the rotating shaft is arranged perpendicular to the screw rod, and the secondary driving wheel and the secondary driven wheel are matched by a bevel gear or a bevel gear.
4. The vehicle electronic parking brake power device according to claim 2, wherein the transmission mechanism further comprises a transmission nut, the transmission nut is sleeved on the lead screw through screw fit, and the transmission nut is fixedly connected to the secondary driven wheel.
5. The vehicle electronic parking brake power device according to claim 4, wherein the transmission nut is connected to the secondary driven wheel through threaded fit, and threaded locking glue is coated between the transmission nut and the secondary driven wheel.
6. The vehicle electronic parking brake power device according to claim 4, wherein a limiting seat and an elastic member are further disposed in the housing, the limiting seat is fixedly sleeved on the lead screw and located at the rear side of the transmission nut, the elastic member is sleeved on the lead screw and located in the limiting seat, the rear end of the elastic member contacts with the inner wall of the limiting seat, and the front end of the elastic member contacts with the transmission nut.
7. The vehicle electronic parking brake power device according to claim 6, wherein the transmission nut is rotatably mounted in the housing through at least one bearing, the bearing is sleeved outside the transmission nut, and the other end of the elastic member abuts against one of the bearings to realize contact with the transmission nut.
8. The vehicle electronic parking brake power device according to any one of claims 1 to 7, wherein a limiting portion is provided at a rear end portion of the screw rod, a limiting groove engaged with the limiting portion is provided on the housing, and a non-circular engaging structure is adopted between the limiting portion and the limiting groove.
9. An electronic parking brake system for a vehicle, comprising an electronic parking brake power device and a brake connected to the electronic parking brake power device, wherein the electronic parking brake power device adopts the electronic parking brake power device for the vehicle as claimed in any one of claims 1 to 8.
10. The vehicle electronic parking brake system of claim 9, wherein the brake is a drum brake.
CN201920179463.7U 2019-01-31 2019-01-31 Vehicle electronic parking braking power device and vehicle electronic parking braking system Active CN209972427U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920179463.7U CN209972427U (en) 2019-01-31 2019-01-31 Vehicle electronic parking braking power device and vehicle electronic parking braking system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920179463.7U CN209972427U (en) 2019-01-31 2019-01-31 Vehicle electronic parking braking power device and vehicle electronic parking braking system

Publications (1)

Publication Number Publication Date
CN209972427U true CN209972427U (en) 2020-01-21

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Application Number Title Priority Date Filing Date
CN201920179463.7U Active CN209972427U (en) 2019-01-31 2019-01-31 Vehicle electronic parking braking power device and vehicle electronic parking braking system

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112406832A (en) * 2020-11-02 2021-02-26 精诚工科汽车系统有限公司 Braking system and vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112406832A (en) * 2020-11-02 2021-02-26 精诚工科汽车系统有限公司 Braking system and vehicle
CN112406832B (en) * 2020-11-02 2021-12-17 精诚工科汽车系统有限公司 Braking system and vehicle

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