CN107588126A - A kind of electric mechanical brake-by-wire device - Google Patents
A kind of electric mechanical brake-by-wire device Download PDFInfo
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- CN107588126A CN107588126A CN201710906449.8A CN201710906449A CN107588126A CN 107588126 A CN107588126 A CN 107588126A CN 201710906449 A CN201710906449 A CN 201710906449A CN 107588126 A CN107588126 A CN 107588126A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The present invention relates to a kind of electric mechanical brake-by-wire device, including motor, transmission mechanism, one-way clutch, screw rod, nut piston, friction stopping means etc..Motor drives one-way clutch to rotate by transmission mechanism, one-way clutch, which combines, drives nut rotation, drive piston and braking clamp body to move in the opposite direction respectively by thread transmission, friction plate is compressed from brake disc both sides with identical power, realizes efficient braking effect.Simple in construction, reliable operation of the invention, retardation efficiency is high, can automatically adjust brake clearance, and compensates due to influence, the design of simplified control system, available for service brake and parking braking caused by friction disc wear.
Description
Technical field
The present invention relates to brake field, existing floating caliper type disc liquid braking device can be specifically replaced, with automatically controlled machine
The mode of tool realizes that friction plate clamps brake disc from both sides with identical pressure, while can realize that brake clearance is adjustable, brakes
The adjustable line traffic control mechanical brake of intensity, refers in particular to a kind of electric mechanical brake-by-wire device.
Background technology
Brake-by-wire technology is a kind of new braking technology occurred in recent years, between brake and brake pedal not
By machinery or fluid power connection, the information controlled motor that sensor is received by control system works, realized for automobile
Reliable and stable control for brake.Mainly there are electro-hydraulic formula brakes (EHB) and mechanical type brake system electric at present
(EMB) two kinds.Line control brake system is advantageous to the optimization of braking performance of vehicle, can be easily other with ABS, ASR, ESP etc.
Electronic control system combines, therefore has wide development space.
Electro-hydraulic formula brakes (EHB) is transformed by traditional brake fluid system, and braking procedure is rapider,
It is stable, the braking safety and comfortableness of automobile are improved, but due to remaining hydraulic unit, do not possess complete brake-by-wire system
The all advantages of system, it is often viewed as a kind of product in advance of mechanical type brake system electric (EMB).
Mechanical type brake system electric (EMB) realizes braking procedure by motor drive machinery mechanism, enormously simplify system
The structure of dynamic system, makes brake more easily arrange, assemble and overhauls.But existing mechanical type brake system electric due to
Part brake often lacks the function that brake clearance automatically adjusts, and makes brake in outside environmental change and friction disc wear
In the case of the problem of causing brake actuator efficiency change indefinite, so as to bring certain difficulty to brake efficiency control.Together
When, the problems such as structure is more complicated, and installation dimension is larger be present in most of brake.
The content of the invention
It is an object of the invention to propose a kind of electric mechanical brake-by-wire device.The present invention have it is simple in construction, work can
By the advantages that, automatically adjusting for brake clearance can be realized, by the displacement or the corner that detect friction plate drive mechanism, you can change
Calculation draws braking clamping force size, so that control system is able to corresponding simplification.
Realize that the technical scheme of the object of the invention is as follows：
A kind of electric mechanical brake-by-wire device, comprising motor, transmission mechanism, one-way clutch, screw rod, nut, piston, rubs
Wipe stopping means, braking clamp body, brake disc, friction plate；Described friction plate has two panels, is arranged symmetrically in described brake disc two
Side, one is arranged on described piston, and one is arranged on described braking clamp body；Described piston is via described friction
Stopping means is arranged on described braking clamp body；A described friction stopping means part is fixedly mounted on described caliper
On body, another part has larger frictional force with described piston space, has when between described piston and described braking clamp body
During relative displacement, because frictional force effect makes to produce elastic potential energy in described friction stopping means；Described motor connection institute
The input element for the transmission mechanism stated；One-way clutch described in the final element connection of described transmission mechanism, described list
The nut described to clutch connection, described nut are arranged on described piston, can rotated around own axes direction, along certainly
The movement in body axis direction is limited by described piston；Described screw rod is fixedly mounted on described braking clamp body, and described
Nut location it is corresponding；Described screw rod coordinates with described nut；The final element motion of described transmission mechanism, it is described
One-way clutch when combining, drive described nut rotation, pass through the described braking clamp body of thread transmission driving and institute
The piston stated moves in the opposite direction, drives the brake disc described in described friction plate from two side compressions；
During braking, described motor drives described one-way clutch to move via described transmission mechanism, now described
One-way clutch combine, drive described nut rotation, be fixedly mounted on due to described screw rod on described braking clamp body,
It can not rotate, therefore described nut rotation drives described piston and described braking clamp body to transport in the opposite direction respectively
It is dynamic, described friction plate is pressed on described brake disc both sides, obtain the braking effect of high efficient and reliable, now, described work
There is relative displacement between plug and described braking clamp body, elastic potential energy is produced in described friction stopping means；Made when releasing
When dynamic, described motor drives described one-way clutch counter motion via described transmission mechanism, and now described is unidirectional
Clutch separation, the elastic potential energy effect inside described friction stopping means, makes described piston and described braking clamp body
Relative motion, recovers initial position, and now described nut is rotated to adapt to the phase of described piston and described braking clamp body
To motion；
After described friction plate has abrasion, thickness thinning, during braking operation, described motor is via described driver
The described one-way clutch of structure driving combines, and drives described nut rotation, makes described piston and described caliper body phase
To motion, elastic potential energy reaches maximum in described friction stopping means, and because friction plate is thinning, braking effect is bad, now
Described motor works on, and drives described nut to be rotated further, and overcomes described piston and described friction stopping means
Between frictional force, make described piston and described braking clamp body continue to relatively move, compress brake disc, obtain it is reliable efficiently
Braking effect；When releasing braking, the elastic potential energy effect in described friction stopping means, make described piston and described
Braking clamp body relative motion, now described piston are relatively fixed with described friction stopping means with new contact position, real
The adjust automatically of existing brake clearance.
It is additionally included between described nut and described screw rod using circulation spherical structure, to reduce frictional resistance, improves
System operating efficiency.
Being additionally included between described one-way clutch and described nut increases transmission system.
It is additionally included in the position that described piston is connected with described nut and uses roller mechanism, reduces frictional resistance.
When the transmission link for being zero without reverse efficiency in described transmission mechanism or described transmission system, using locking machine
Structure realizes the parking braking under described motor powering-off state, and described lockable mechanism uses electromagnetic brake or electric-controlled mechanical system
Dynamic device, can be disconnected when being powered, power-off when fixed conveyor link in actuated element, keep described friction plate and described
Brake disc between pressure size, realize parking braking function；Set when in described transmission mechanism or described transmission system
When having the transmission link that reverse efficiency is zero, parking braking can be realized using described lockable mechanism, reverse efficiency can also be utilized
Be zero, power and motion can not back transfer, realize the parking braking under described motor powering-off state.
Brief description of the drawings
Fig. 1 is a kind of front view of the embodiment one of electric mechanical brake-by-wire device of the present invention.
Fig. 2 is a kind of A direction views of the embodiment one of electric mechanical brake-by-wire device of the present invention.
Fig. 3 is a kind of front view of the embodiment two of electric mechanical brake-by-wire device of the present invention.
Explanation is marked in accompanying drawing：1- brake-caliper support 2- guide finger 3- braking clamp body 4- plain thrust bearing 5- screw rods
6- worm gear 7- one-way clutch 8- worm screw 9- sealing ring 10- motor 11- piston 12- friction plate 13- brake discs 14- electricity
Arbor 15- electromagnetic brake 16- primary drive gear 17- spring 18- snap ring 19- primary 20- level master of driven gear
21- level driven gear 22- magnet coil 23- lock pin 24- return spring 25- nut 26- radial bearing of moving gear
Embodiment
Refer to the attached drawing 1 and accompanying drawing 2, one embodiment of the present of invention is described in detail.
As shown in figure 1, a kind of electric mechanical brake-by-wire device includes a caliper that can be moved on guide finger (2)
Body (3), guide finger (2) are fixed on brake-caliper support (1).There are brake disc (13), brake disc in the jaw of braking clamp body (3)
(13) there is friction plate (12) both sides, and one is mounted on braking clamp body (3), and one is mounted on piston (11), and piston (11) passes through
Sealing ring (9) has larger frictional force between the contact surface of sealing ring (9) and piston (11), works as piston on braking clamp body (3)
(11) when displacement is in the regime of elastic deformation of sealing ring (9), without relative fortune between the contact surface of sealing ring (9) and piston (11)
It is dynamic.The opposite side of piston (11) has hole, and nut (25) is provided with hole, has plane between the hole of nut (25) and piston (11)
Thrust bearing (4) and radial bearing (26), to reduce friction loss.Nut (25) coordinates with screw rod (5), the fixed peace of screw rod (5)
On braking clamp body (3).The outer surface of nut (25) is connected by one-way clutch (7) with worm gear (6), is matched somebody with somebody with worm gear (6)
The worm screw (8) for closing work is driven by motor (10).
During braking operation, motor (10) drives worm screw (8) and worm gear (6) to rotate, and now one-way clutch (7) combines, band
Dynamic nut (25) rotates, and because screw rod (5) is fixedly mounted on braking clamp body (3), can not rotate, therefore the rotation of nut (25)
Make piston (11) and nut (25) to left movement, meanwhile, screw rod (5) and braking clamp body (3) move right, i.e. piston (11) and system
Moving caliper (3) is moved in the opposite direction, and friction plate corresponding to drive (12) is forced to brake disc (13) from both sides with identical,
Realize the braking effect of high efficient and reliable.Now, elastic deformation occurs for sealing ring (9), stores elastic potential energy, sealing ring (9) and work
Without relative motion between the contact surface of plug (11).When releasing braking operation, motor (10) drives worm-and-wheel gear to rotate backward, this
When, one-way clutch (7) separation, nut (25) is in free state, the elastic potential energy release of sealing ring (9) storage, makes piston
(11) reversely rotated with braking clamp body (3) relative motion, drive nut (25) under the elastic potential energy effect in sealing ring (9),
All elements recover initial position.
When friction plate (12) wears, after thickness is thinning, during braking operation, motor (10) pass through worm-and-wheel gear drive it is single
Combined to clutch (7), drive nut (25) rotates, and promotes piston (11) and braking clamp body (3) relative motion, sealing ring (9)
Elastic deformation amount when reaching maximum, because friction plate (12) wears, braking effect is bad, and now motor (10) continues through knot
One-way clutch (7) drive nut (25) of conjunction rotates, i.e., piston (11) and braking clamp body (3) continue relative motion, therefore, close
Seal (9) keeps maximum flexibility deflection, and piston (11) overcomes the frictional force between sealing ring (9), with new contact surface
It is engaged with sealing ring (9), i.e., piston (11) is more than the maximum flexibility change of sealing ring (9) relative to the displacement of braking clamp body (3)
Shape amount.When releasing braking, motor (10) drives worm-and-wheel gear reversion, one-way clutch (7) separation, the bullet of sealing ring (9)
Property potential energy release, make piston (11) and braking clamp body (3) relative motion, drive nut (25) reverse rotation, now sealing ring (9)
Positioning is coordinated with new contact surface with piston (11), return displacement is still the maximum flexibility deflection of sealing ring (9), therefore
It is identical with before abrasion to maintain brake clearance, realizes the adjust automatically of brake clearance.
When the transmission reverse efficiency of worm screw (8) and worm gear (6) is zero, motor (10) can be made to drive friction plate (12) to compress
Brake disc (13), after reaching parking braking requirement, motor (10) powering-off state is realized using the auto-lock function of worm-and-wheel gear
Under parking braking.
Refer to the attached drawing 3, an alternative embodiment of the invention is described.
The embodiment of accompanying drawing 3 and the embodiment main distinction of accompanying drawing 1 are as follows：
Transmission mechanism is different, is driven in accompanying drawing 1 using worm-and-wheel gear, and worm gear (6) is the final element of transmission mechanism,
One-way clutch (7) is arranged between worm gear (6) and nut (25)；Two-stage gear drive, secondary driven gear are used in accompanying drawing 3
(21) it is the final element of transmission mechanism, one-way clutch (7) is arranged between secondary driven gear (21) and nut (25).
The stopping means that rubs is different, realizes friction limit function using sealing ring (9) in accompanying drawing 1, utilizes sealing ring (9)
Elastic deformation stores elastic potential energy；Friction limit function is realized using spring (17) and snap ring (18) in accompanying drawing 3, utilizes spring
(17) elastic deformation storage elastic potential energy is produced.
The mode that parking braking function is realized is different, and in accompanying drawing 1, the reverse efficiency using worm-and-wheel gear is zero, directly
The parking braking under motor (10) powering-off state can be realized；In accompanying drawing 3, illustrate and released when being powered using electromagnetic brake (15)
Discharge arbor (14), and locking motor shaft (14) realizes the parking braking mode under motor (10) powering-off state during power-off, is also represented by
Using the parking braking mode of electric-controlled mechanical brake apparatus, when magnet coil (22) is powered, lock pin (23) is by electromagnetism masterpiece
With compression retracteding position spring (24), making lock pin (23) be not in contact with each other with secondary driven gear (21), braking to brake or release
Put no any influence；When needing parking braking, motor (10) driving friction plate (12) compresses brake disc (13), reaches parking
Brake request, then magnet coil (22) power off, lock pin (23) return spring (24) the lower insertion secondary of elastic force effect from
In the tooth of moving gear (21), parking braking effect is kept, you can realize the parking braking function under motor (10) powering-off state.
As shown in figure 3, there is brake disc (13) in the jaw of braking clamp body (3), there is friction plate the both sides of brake disc (13)
(12), one is mounted on braking clamp body (3), and one is mounted on piston (11), and piston (11) is mounted in caliper by snap ring (18)
On body (3), snap ring (18) pushes the side away from brake disc (13) to by spring (17), and spring (17) is arranged on braking clamp body (3)
On.Have larger frictional force between the contact surface of snap ring (18) and piston (11), when piston (11) displacement spring (17) bullet
When in property deformation range, without relative motion between the contact surface of snap ring (18) and piston (11).The opposite side of piston (11) has hole, hole
Nut (25) is inside installed, has plain thrust bearing (4) and radial bearing (26) between the hole of nut (25) and piston (11),
To reduce friction loss.Nut (25) coordinates with screw rod (5), and screw rod (5) is fixedly mounted on braking clamp body (3).Nut (25)
Outer surface be connected by one-way clutch (7) with secondary driven gear (21), secondary driven gear (21), secondary driving gear
(20), primary driven gear (19) forms two-stage gear reduction, primary drive gear (16) with primary drive gear (16)
It is fixedly mounted on motor shaft (14).
During braking operation, motor (10) drives one-way clutch (7) to combine by two-stage gear reduction, drives nut
(25) rotate, promote piston (11) and braking clamp body (3) to move in the opposite direction, friction plate corresponding to drive (12) is from both sides
The braking effect for brake disc (13), realizing high efficient and reliable is forced with identical.Now, snap ring (18) and piston (11) move together
Dynamic, elastic deformation occurs for compression spring (17), spring (17), stores the contact surface of elastic potential energy, snap ring (18) and piston (11)
Between without relative motion.Release braking operation when, motor (10) drive two-stage gear reduction rotate backward, now, unidirectionally from
Clutch (7) separates, and nut (25) is in free state, the elastic potential energy release of spring (17) storage, makes piston (11) and braking
Caliper (3) relative motion, drive and reversely rotated under elastic potential energy effect of the nut (25) in spring (17), all elements recover
Initial position.
When friction plate (12) wears, after thickness is thinning, during braking operation, motor (10) passes through two-stage gear reduction band
Dynamic one-way clutch (7) combines, and drive nut (25) rotates, and promotes piston (11) and braking clamp body (3) relative motion, spring
(17) elastic deformation amount reaches maximum, and snap ring (18) is close to when on the step surface of left side, because friction plate (12) wears, braking
Ineffective, now motor (10) is rotated further by one-way clutch (7) drive nut (25) of combination, i.e., piston (11) and
Braking clamp body (3) continues relative motion, and therefore, spring (17) keeps maximum flexibility deflection, and piston (11) overcomes and snap ring
(18) frictional force between, it is engaged with new contact surface with snap ring (18).When releasing braking, motor (10) drives two-stage gear
Reducing gear inverts, one-way clutch (7) separation, the elastic potential energy release of spring (17), makes piston (11) and braking clamp body (3)
Relative motion, nut (25) rotation is driven, now snap ring (18) and piston (11) coordinate positioning, return displacement with new contact surface
Amount is still the maximum flexibility deflection of spring (17), thus maintain brake clearance and abrasion before it is identical, realize brake cabin
The adjust automatically of gap.
When needing parking braking, make motor (10) drive friction plate (12) to compress brake disc (13), reach parking braking
It is required that then electromagnetic brake (15) powers off, locking motor shaft (14), keep brake efficiency constant, motor now can be achieved
(10) parking braking function under powering-off state.When electromagnetic brake (15) is powered, motor shaft (14) is discharged, now braking moment
Big I is freely controlled by motor (10).Or electric-controlled mechanical brake apparatus is used, during energization, magnet coil (22) makes lock pin
(23) return, during power-off, lock pin (23) is inserted in the tooth of secondary driven gear (21), is realized under motor (10) powering-off state
Parking braking function.
In this embodiment, electric-controlled mechanical brake apparatus can also be acted directly on primary driven gear (19), or secondary
On driving gear (20), or act on the locking wheel specially set, can obtain similar parking braking effect.
In the embodiment of accompanying drawing 3, one-way clutch (7) can also be arranged in primary driven gear (19), or primary
In driving gear (16), or in secondary driving gear (20)；In the embodiment of accompanying drawing 1 and accompanying drawing 2, one-way clutch (7) is also
It can be arranged in worm screw (8), content to be protected as needed for claim 3.
Transmission mechanism can also use Chain conveyer, V belt translation, lever in addition to using fixed axis gear mechanism, worm-and-wheel gear
Other kinds of drive such as transmission, drag-line transmission, Planetary Gear Transmission, friction stopping means is in addition to using sealing ring, spring/snap ring
Similar function can also be achieved using other structures, lockable mechanism can also act on lock pin on other gears
Or on the special latch ratchet integral with gear, or the modes such as ratchet and pawl arrangement are installed on motor shaft and realize latch functions.
Obviously, described embodiment is only the part of the embodiment of the present invention, rather than whole embodiments, based in the present invention
Embodiment, one of ordinary skilled in the art's other all realities for being obtained on the premise of no progress creative work
Example is applied, belongs to protection scope of the present invention.
The present invention is exemplarily described above in conjunction with accompanying drawing, it is clear that present invention specific implementation is not by aforesaid way
Limitation, as long as employ the inventive concept and technical scheme of the present invention progress various improvement, or it is not improved directly application
In other occasions, within protection scope of the present invention.
Claims (5)
1. a kind of electric mechanical brake-by-wire device, include motor, transmission mechanism, one-way clutch, screw rod, nut, piston, friction
Stopping means, braking clamp body, brake disc, friction plate；Described friction plate has two panels, is arranged symmetrically in described brake disc two
Side, one is arranged on described piston, and one is arranged on described braking clamp body；Described piston is via described friction
Stopping means is arranged on described braking clamp body；A described friction stopping means part is fixedly mounted on described caliper
On body, another part has larger frictional force with described piston space, has when between described piston and described braking clamp body
During relative displacement, because frictional force effect makes to produce elastic potential energy in described friction stopping means；Described motor connection institute
The input element for the transmission mechanism stated；One-way clutch described in the final element connection of described transmission mechanism, described list
The nut described to clutch connection, described nut are arranged on described piston, can rotated around own axes direction, along certainly
The movement in body axis direction is limited by described piston；Described screw rod is fixedly mounted on described braking clamp body, and described
Nut location it is corresponding；Described screw rod coordinates with described nut；The final element motion of described transmission mechanism, it is described
One-way clutch when combining, drive described nut rotation, pass through the described braking clamp body of thread transmission driving and institute
The piston stated moves in the opposite direction, drives the brake disc described in described friction plate from two side compressions；
During braking, described motor drives described one-way clutch to move via described transmission mechanism, now described list
Combined to clutch, drive described nut rotation, be fixedly mounted on due to described screw rod on described braking clamp body, can not
Rotate, therefore described nut rotation drives described piston and described braking clamp body to move in the opposite direction respectively, makes
Described friction plate is pressed on described brake disc both sides, obtains the braking effect of high efficient and reliable, now, described piston and institute
There is relative displacement between the braking clamp body stated, elastic potential energy is produced in described friction stopping means；When releasing braking, institute
The motor stated drives described one-way clutch counter motion, now described one-way clutch point via described transmission mechanism
From, the elastic potential energy effect inside described friction stopping means, make described piston and described braking clamp body relative motion,
Recover initial position, now described nut is rotated to adapt to the relative motion of described piston and described braking clamp body；
After described friction plate has abrasion, thickness thinning, during braking operation, described motor drives via described transmission mechanism
Move described one-way clutch to combine, drive described nut rotation, make described piston and the relative fortune of described braking clamp body
Dynamic, elastic potential energy reaches maximum in described friction stopping means, and because friction plate is thinning, braking effect is bad, now described
Motor work on, drive described nut to be rotated further, overcome between described piston and described friction stopping means
Frictional force, make described piston and described braking clamp body continue to relatively move, compress brake disc, obtain reliable efficient system
Dynamic effect；When releasing braking, the elastic potential energy effect in described friction stopping means, make described piston and described braking
Caliper relative motion, now described piston are relatively fixed with described friction stopping means with new contact position, realize system
The adjust automatically in dynamic gap.
2. a kind of electric mechanical brake-by-wire device according to claim 1, it is characterised in that be additionally included in described nut
Using circulation spherical structure between described screw rod, to reduce frictional resistance, system operating efficiency is improved.
3. a kind of electric mechanical brake-by-wire device according to claim 1, it is characterised in that unidirectional described in being additionally included in
Increase transmission system between clutch and described nut.
4. a kind of electric mechanical brake-by-wire device according to claim 1, it is characterised in that be additionally included in described piston
The position being connected with described nut uses roller mechanism, to reduce frictional resistance.
5. a kind of electric mechanical brake-by-wire device according to claim 1 or claim 3, it is characterised in that when described
During the transmission link for being zero without reverse efficiency in transmission mechanism or described transmission system, described motor is realized using lockable mechanism
Parking braking under powering-off state, described lockable mechanism use electromagnetic brake or electric-controlled mechanical brake apparatus, can be logical
Actuated element when disconnecting, powering off when electric in fixed conveyor link, keeps pressure between described friction plate and described brake disc
Size, realize parking braking function；It is zero when being provided with reverse efficiency in described transmission mechanism or described transmission system
During transmission link, parking braking can be realized using described lockable mechanism, can also be zero using reverse efficiency, power and motion
Can not back transfer, realize the parking braking under described motor powering-off state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710906449.8A CN107588126B (en) | 2017-09-26 | 2017-09-26 | Electronic mechanical wire control actuator |
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|---|---|---|---|
| CN201710906449.8A CN107588126B (en) | 2017-09-26 | 2017-09-26 | Electronic mechanical wire control actuator |
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| Publication Number | Publication Date |
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| CN107588126A true CN107588126A (en) | 2018-01-16 |
| CN107588126B CN107588126B (en) | 2023-05-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109114135A (en) * | 2018-11-09 | 2019-01-01 | 山东交通学院 | A kind of electromagnetic type line traffic control electronic brake |
| CN110486392A (en) * | 2019-07-27 | 2019-11-22 | 浙江师范大学 | A kind of self energizing effort brake-by-wire device |
| WO2024109494A1 (en) * | 2022-11-23 | 2024-05-30 | 芜湖伯特利汽车安全***股份有限公司 | Electromechanical brake caliper and brake system |
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