CN219154246U - Emergency device for brake failure of new energy automobile - Google Patents

Abstract

The utility model relates to the technical field of braking and discloses an emergency device for new energy automobile braking failure, which comprises a driven shaft, a combining device, an operating device, a braking shaft and a traction force source, wherein the driven shaft is connected with an electric automobile differential mechanism, the operating device is used for driving the combining device to combine the driven shaft with the braking shaft, and the traction force source is connected with the braking shaft. The utility model has the following advantages and effects: according to the utility model, traction force can be provided for the electric automobile and automatic braking can be provided for the electric automobile under the condition of braking failure of the electric automobile, the electric automobile is decelerated, the traction force source comprises a plurality of motors and speed reducers, the graded deceleration can be realized, and the safety of drivers and passengers can be better ensured under the condition of braking failure of the electric automobile.

Description

Emergency device for brake failure of new energy automobile

Technical Field

The utility model relates to the technical field of electric automobile braking, in particular to an emergency device for new energy automobile braking failure.

Background

The electric automobile is a vehicle which uses a vehicle-mounted power supply and the like as power and uses a motor to drive wheels to run and meets various requirements of road traffic and safety regulations. The environmental impact is smaller than that of the traditional automobile, and the prospect is widely seen. At present, the electric automobile is frequently disclosed to have a brake failure in the running process, and the situation of the brake failure can greatly threaten the life and property safety of drivers and passengers, and traffic safety accidents are easy to cause. The electric automobile braking system has the following characteristics that because the electric automobile does not have the engine structure of the fuel automobile, vacuum assistance can not be generated through the work of the engine, and an electronic vacuum pump is required to be designed to provide vacuum. Compared with the mechanical vacuum pump of a fuel automobile, the electronic vacuum pump structure is more complex, the probability of failure is higher, once failure occurs, assistance cannot be provided, and a driver hardly presses a brake pedal. Some electric vehicles adopt an electronic power-assisted control brake system, but the electronic control system is also possible to fail, and once the electric vehicles are powered off or the vehicle computer is halted, the brake system can also fail completely.

Disclosure of Invention

The utility model aims to provide an emergency device for braking failure of a new energy automobile, which has the effect of slowing down the automobile when the braking failure of an electric automobile occurs.

The technical aim of the utility model is realized by the following technical scheme: the utility model provides an emergency device of new energy automobile brake failure, includes driven shaft, coupling device, operating means, braking axle, traction force source, the driven shaft is connected with electric automobile differential mechanism, operating means is used for driving coupling device with the driven shaft with the braking axle combines, traction force source with the braking axle is connected.

By adopting the technical scheme, the driven shaft is connected to the differential mechanism, and the driven shaft idles and the brake shaft does not rotate when the electric automobile runs. After the original brake of the electric automobile is out of order in the running process, a driver drives the combining device to work through the mechanical operating device, the driven shaft is combined with the brake shaft after the combining device works, and after the driven shaft drives the brake shaft to rotate, the traction force source provides traction force required by braking, so that the electric automobile is slowed down and braked.

The utility model is further provided with: the traction force source includes one or more motors.

By adopting the technical scheme, the traction force source can be one motor or a plurality of motors. Taking two motors as examples, the two motors have different powers, the braking effect of the traction force provided by the small motor is equivalent to the speed reduction of the 3 gear level of the domestic bridge 5 for stopping, and the braking effect of the traction force provided by the high-power motor is equivalent to the speed reduction of the 1 gear level of the domestic bridge 5 for stopping. When the running speed of the electric automobile is higher, the low-power motor provides traction force. When the running speed of the electric automobile is low, the high-power motor provides traction force.

The utility model is further provided with: the motor comprises a shell, a stator, a rotor and a plurality of elastic components, wherein the stator can rotate in the shell, the elastic components are elastically acted on the stator to drive the rotated stator to return, the shell is provided with a perforation, the stator is hinged with a movable part, the movable part passes through the perforation and then is positioned outside the shell, the movable part is connected with a wire pulling mechanism, and the wire pulling mechanism is used for pulling a brake pedal of an original vehicle.

Through adopting above-mentioned technical scheme, when electric automobile's vacuum helping hand system breaks down and can't provide the helping hand, when the motor is providing traction force, the stator receives the resistance back rotation, and then drives the moving part swing, and the moving part passes through the mechanism pulling of acting as go-between and former car brake pedal pushes down, plays the effect that provides brake helping hand.

The utility model is further provided with: the movable piece comprises a crank hinged to the stator and a connecting rod hinged to the crank, the crank penetrates through the through hole, the wire pulling mechanism comprises a support, a movable seat movably arranged on the support and a first wire pulling mechanism, the connecting rod is hinged to the movable seat, one end of the first wire pulling mechanism is fixed to the movable seat, and the other end of the first wire pulling mechanism is used for driving a brake pedal to move.

The utility model is further provided with: the first pull wire is provided with a first elastic device, the first elastic device comprises a first cylinder body, a first piston and a first spring, two ends of the first spring are respectively connected with the first cylinder body and the first piston, the first pull wire is connected with the first piston, and the first cylinder body is connected with a brake pedal through a first connecting rope.

By adopting the technical scheme, if the first stay wire is directly connected and fixed with the brake pedal, the acting force exerted by the rotation of the brake pedal by the first stay wire can exceed the maximum bearing capacity of the original brake master cylinder, so that the brake master cylinder and other parts are damaged. According to the utility model, the first elastic device is arranged on the first pull wire, wherein the elastic force of the first spring does not exceed the maximum bearing force of the original brake master cylinder, so that the brake master cylinder is prevented from being damaged due to overlarge power assistance.

The utility model is further provided with: the traction force source comprises a central shaft, a pinion and a large gear, the central shaft is shared by a plurality of motors, the pinion is installed and fixed on the central shaft, the large gear is installed on the brake shaft or the large gear is installed on the combining device, and the large gear is meshed with the pinion.

The utility model is further provided with: the combination device comprises a brake disc fixed on a driven shaft, a sleeve shell fixed on a brake shaft, a fixing part, a shifting fork hinged to the fixing part, a bearing and an operating device, wherein the sleeve shell is sleeved on the brake disc, a notch is formed in the end face of the sleeve shell, a brake block is arranged in the notch, the inner ring and the outer ring of the bearing are respectively contacted with the shifting fork and the brake block, and the operating device is used for driving the shifting fork to swing.

Through adopting above-mentioned technical scheme, when the combination device during operation is needed, operating means drives the shift fork swing, and the shift fork passes through the bearing and promotes the brake block and lean on the brake disc, drives the brake block motion when the brake disc is rotatory, and the brake block acts on the notch inner wall and drives the cover shell and rotate, and the cover shell drives the brake shaft and rotates, realizes combining driven shaft and brake shaft.

The operating device drives the shifting fork to swing and keep away from the brake pad, the acting force between the brake pad and the brake disc is reduced or even eliminated, the friction force between the brake pad and the brake disc is smaller or even eliminated, and the function of releasing the combination of the driven shaft and the brake shaft is realized.

The gearwheel may be mounted on the brake shaft or on the circumferential outer wall of the casing between the release bearings.

The utility model is further provided with: the notch is provided with a first guiding inclined plane, and the first guiding inclined plane guides the brake disc to lean against the brake disc after the brake pad receives the friction force of the brake disc.

By adopting the technical scheme, the brake disc is driven to move when rotating, the first guiding inclined plane is consistent with the movement trend of the brake disc, and the guiding brake disc is abutted against the brake disc. After the acting force is kept on the brake pad through the bearing only by the shifting fork, the brake pad only can be more and more close to the brake disc under the action of the first guide inclined plane, and the brake pad is difficult to separate from the brake disc, so that a good rapid combination effect between the driven shaft and the brake shaft is ensured.

The utility model is further provided with: the utility model discloses a brake equipment, including the cover shell, the cover shell is equipped with a plurality of notches, every cover shell both sides are equipped with two the shift fork, two still be equipped with the cam between the shift fork, the shift fork supports on the cam curved surface, two still be connected with return spring between the shift fork, operating means drives two through driving the cam rotates the shift fork swing, the bearing is release bearing and quantity is two, every the bearing all is located the shift fork with between the brake block, the bearing housing is in on the brake axle and be clearance fit.

By adopting the technical scheme, the notch and the brake pads are distributed on two sides of the brake disc, and the brake pads can be better combined with the brake disc, so that the driven shaft and the brake shaft can be better combined.

The cam rotates to drive the two pushing bearings to move, so that acting force is applied to the brake pad to enable the brake pad to be tightly attached to the brake disc. The cam rotates reversely, the two shifting forks are reset under the action of the elastic force of the return springs, the acting force applied to the brake pad is reduced, the friction force between the brake pad and the brake disc is reduced or even eliminated, and at the moment, the driven shaft and the brake shaft are released from combination.

The utility model is further provided with: the operating device comprises an operating part, a second stay wire and a second elastic device, wherein the operating part is one of a traditional hand brake, a straight-pull hand brake and a foot-operated hand brake, the second elastic device comprises a second cylinder body, a second piston and a second spring, two ends of the second spring are respectively propped against the second piston and the second cylinder body, two ends of the second stay wire are respectively fixed on the operating part and the second piston, and the second cylinder body is fixed on the cam or the shifting fork through a second connecting rod.

Through adopting above-mentioned technical scheme, if directly with the second stay wire connect on the cam, the driver can drive the cam through the second stay wire and shift fork motion, but can have following problem: the driver can not continuously pull the stay wire all the time, the operating device can keep the stay wire after pulling the stay wire, in the process, the brake pad can continuously be close to the brake disc under the combined action of friction force and the first guiding inclined plane, so that gaps are formed among the shifting fork, the bearing and the brake pad, and the bearing can shake and collide. According to the utility model, the second pull wire is designed to pull the second piston to move, the second piston drives the second cylinder body and the second connecting rod to move through the second spring, and then the cam is pulled to rotate, so that even if the pull wire is in a position maintaining state, the brake pad is close to the brake disc under the combined action of friction force and the first guide inclined plane, after a gap is formed among the shifting fork, the bearing and the brake disc, the spring which is elastically deformed can release elasticity, and the cam and the shifting fork are driven to move, so that the formed gap is eliminated.

The beneficial effects of the utility model are as follows:

1. the electric automobile braking device is operated after being manually started when the electric automobile braking fails, the driven shaft and the braking shaft are combined through the combining device, the traction force required by braking is provided through the traction force source, the electric automobile is decelerated and braked, and the life and property safety of drivers and passengers of the electric automobile is guaranteed to the greatest extent.

2. When the electric automobile brake system works, the angle of the motor stator of the traction force source is changed, and the brake pedal of the electric automobile is pulled by the movable piece and the pull wire mechanism to provide power, so that the original brake system of the electric automobile is recovered to work normally. The elastic force in the first elastic device in the wire pulling mechanism does not exceed the maximum bearing force of the original brake master cylinder, and the damage to the brake system caused by overlarge power assistance is avoided.

3. The combining device increases combining sites between the combining device and the brake disc through a plurality of brake pads; the first guide inclined plane of notch inner wall for the shift fork is through the bearing for the brake block applys certain effort, and first guide inclined plane receives under the cooperation of frictional force at the brake block, and the brake block only can constantly lean on the brake disc, makes to keep very excellent bonding effect between brake block and the brake disc.

4. According to the utility model, traction force can be provided for the electric automobile and power can be provided for assisting the electric automobile under the condition of brake failure of the electric automobile, the electric automobile is decelerated, the traction force source comprises a plurality of motors, the graded deceleration can be realized, and the safety of drivers and passengers can be better ensured under the condition of brake failure of the electric automobile.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of embodiment 1.

Fig. 2 is a schematic diagram of the positional relationship among the driven shaft, the brake shaft, and the jacket of embodiment 1.

Fig. 3 is a schematic diagram showing the structural relationship among the brake pad, the brake disc, and the jacket according to embodiment 1.

Fig. 4 is a schematic view of the structure of the cam and the second elastic means of embodiment 1.

Fig. 5 is a schematic structural view of the wire pulling mechanism of embodiment 1.

Fig. 6 is a schematic diagram of the motor structure of embodiment 1.

Fig. 7 is a schematic view of the elastic member structure of embodiment 1.

Fig. 8 is a schematic view of the first elastic means and the brake pedal structure of embodiment 1.

Fig. 9 is a schematic view of the structure of the first elastic means of embodiment 1.

Fig. 10 is a schematic diagram of the jacket structure of embodiment 5.

In the figure, 1, a driven shaft; 11. bevel gears; 2. a bonding device; 21. a brake disc; 22. a casing; 221. a notch; 222. a first guiding inclined surface; 23. a shifting fork; 24. a bearing; 25. an operating device; 251. an operation unit; 252. a second pull wire; 253. a second elastic means; 2531. a second cylinder; 2532. a second piston; 2533. a second spring; 2534. a second connecting rod; 26. a brake pad; 261. a second guiding inclined surface; 27. a cam; 28. a return spring; 3. a brake pedal; 4. a brake shaft; 41. a large gear; 5. a motor; 51. a housing; 511. perforating; 512. a movable groove; 52. a stator; 53. a rotor; 54. an elastic component; 541. a sleeve; 542. a third spring; 543. a piston rod; 544. a connecting spring; 55. a movable member; 551. a crank; 552. a connecting rod; 56. a center shaft; 561. a pinion gear; 6. a wire pulling mechanism; 61. a bracket; 62. a movable seat; 63. a first pull wire; 64. a first elastic means; 641. a first cylinder; 642. a first piston; 643. a first spring; 644. a first connecting rope; 7. a differential; 71. a ring gear.

Detailed Description

The technical scheme of the present utility model will be clearly and completely described in connection with specific embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

Example 1: the utility model provides an emergency device that new energy automobile brake is malfunctioning, as shown in fig. 1 through 9, includes driven shaft 1, coupling device 2, brake axle 4, traction force source, fixed part, and electric automobile differential mechanism 7 includes ring gear 71, and ring gear 71 of differential mechanism 7 also is called driven gear, driven ring gear 71, driven bevel gear 11 etc. it meshes with the epaxial gear of power input. The driven shaft 1 is fixed with a bevel gear 11, and the bevel gear 11 meshes with a ring gear 71. The coupling device 2 comprises two brake discs 21 fixed on the driven shaft 1, two sleeves 22 fixed on the brake shaft 4, four shifting forks 23, four bearings 24 and an operating device 25, wherein the two brake discs 21 are in one-to-one correspondence with the two sleeves 22, and the brake discs 21 are positioned inside the sleeves 22. Two forks 23 are disposed on both sides of one of the sleeves 22, and the remaining two forks 23 are disposed on both sides of the remaining sleeve 22. The middle part of the shifting fork 23 is hinged on the fixed part. The two end surfaces of the casing 22 are provided with a plurality of notches 221, each notch 221 is internally provided with a brake pad 26, and the plurality of brake pads 26 on the same end surface of the casing 22 are connected together. The brake shaft 4 is arranged in a hollow way, and the driven shaft 1 is inserted into the brake shaft 4. The four bearings 24 are respectively in one-to-one correspondence with the four shifting forks 23, the bearings 24 are sleeved on the brake shaft 4, and gaps exist between the inner rings of the bearings 24 and the brake shaft 4. And the bearing 24 is located between the fork 23 and the brake pad 26. The inner and outer rings of the bearing 24 are respectively abutted against the shifting fork 23 and the brake pad 26.

The notch 221 is provided with a first guiding inclined plane 222, the brake pad 26 is provided with a second guiding inclined plane 261, and the second inclined plane is attached to the first inclined plane. The inner wall of the notch 221 is also formed with a first mating inclined surface, and the brake pad 26 is provided with a second mating inclined surface, and the second mating inclined surface is attached to the first mating inclined surface. After the brake pad 26 receives the friction force of the brake disc 21, the first guiding inclined plane 222 guides the brake disc 21 to lean against the brake disc 21, and the brake pad 26 and the sleeve 22 have elastic parts for returning the brake pad

A return spring 28 is connected between the two shifting forks 23, a cam 27 is arranged between the two shifting forks 23, the cam 27 is rotationally connected to the fixed part, and the two shifting forks 23 are driven by the elastic force of the return spring 28 to abut against the curved surface of the cam 27. The operating device 25 includes an operating portion 251, a second pull wire 252, and a second elastic device 253, the operating portion 251 is a hand brake, the second elastic device 253 includes a second cylinder 2531, a second piston 2532, and a second spring 2533, the second piston 2532 and the second spring 2533 are all located in the second cylinder 2531, and two ends of the second spring 2533 are respectively fixed on the second piston 2532 and the second cylinder 2531. One end of the second wire 252 is fixed to the operation portion 251, and the other end is fixed to the second piston 2532. A second connecting rod 2534 is fixed to the second cylinder 2531, and the second connecting rod 2534 is fixed to the cam 27.

The working principle of the combining device 2 is as follows: when the driven shaft 1 and the brake shaft 4 are required to be combined, a driver pulls the second pull wire 252 through the operation part 251, the second pull wire 252 drives the second piston 2532, the second cylinder 2531 and the second connecting rod 2534 to move, the second spring 2533 is elastically deformed, after the second connecting rod 2534 drives the cams 27 to rotate, each cam 27 drives two shifting forks 23 to swing, the shifting forks 23 push the bearings 24 and the brake pads 26 to move, friction force is generated after the brake pads 26 contact the brake disc 21, and the brake pads 26 further lean against the brake disc 21 under the guidance of the first guide inclined plane 222. The driven shaft 1 and the brake disc 21 which rotate drive the brake shaft 4 to rotate through the brake pad 26 and the sleeve 22, so that the driven shaft 1 and the brake shaft 4 are combined.

When the coupling state of the driven shaft 1 and the brake shaft 4 needs to be released, after the second pull wire 252 is released by the operation part 251, the two shifting forks 23 swing under the elastic force of the return springs 28, and the cam 27 also returns to rotate after receiving the acting force of the shifting forks 23. The swinging shifting fork 23 is far away from the brake pad 26, so that the acting force applied to the brake pad 26 is reduced, and after the acting force between the brake pad 26 and the brake disc 21 is reduced, the friction force between the brake pad 26 and the brake disc 21 is reduced or even eliminated, so that the combination state of the driven shaft 1 and the brake shaft 4 is released.

The braking shaft 4 is connected with a traction force source, the traction force source comprises a middle shaft 56 and two motors 5, the middle shaft 56 is fixed with a pinion 561, the large gear and the pinion are collectively called a reducer, the braking shaft 4 is fixed with a large gear 41, and the large gear 41 is meshed with the pinion 561. The two motors 5 share a central shaft 56 and are of different power. The motor 5 comprises a shell 51, a rotor 53 and a stator 52, wherein the rotor 53 is arranged on a central shaft 56, the stator 52 is arranged on the shell 51 through a needle bearing 24, and a plurality of elastic assemblies 54 are arranged between the stator 52 and the shell 51. The housing 51 is provided with a movable ball which can rotate on the housing 51, and the movable ball is provided with a through hole 511. The stator 52 is provided with a movable member 55, the movable member 55 comprises a crank 551 and a connecting rod 552, one end of the crank 551 is hinged with the stator 52, and the other end of the crank 551 passes through the perforation 511 and is positioned outside the shell 51. The movable member 55 is connected with a wire pulling mechanism 6, and the wire pulling mechanism 6 includes a bracket 61, a movable seat 62 movably disposed on the bracket 61, and a first wire 63, wherein one end of a connecting rod 552 is hinged to a crank 551, and the other end is hinged to the movable seat 62. One end of the first pull wire 63 is fixed on the movable seat 62, the other end is provided with a first elastic device 64, the first elastic device 64 comprises a first cylinder 641, a first piston 642 and a first spring 643, the first piston 642 and the first spring 643 are both positioned in the first cylinder 641, and two ends of the first spring 643 are respectively fixed on the first piston 642 and the first cylinder 641. The first stretch is fixed with first piston 642. First cylinder 641 is fixed with a first connecting rope 644, and first connecting rope 644 is fixed to brake pedal 3.

The elastic assembly 54 comprises a sleeve 541, a third spring 542 arranged in the sleeve 541, and a piston rod 543 inserted in the sleeve 541, wherein one end of the third spring 542 is fixed on the inner wall of the sleeve 541, and the other end is fixed on the piston rod 543. The housing 51 is provided with a movable groove 512, the sleeve 541 is inserted into the movable groove 512, and the piston rod 543 is hinged with the stator 52. A connection spring 544 is provided between the sleeve 541 and the housing 51, and the connection spring 544 is elastically provided to hold the sleeve 541 in the movable groove 512.

Working principle: in the normal running process of the electric automobile, the ring gear 71 in the differential 7 drives the driven shaft 1 to idle, and the brake shaft 4 does not rotate.

After the original brake of the electric automobile fails, a driver combines the driven shaft 1 with the brake shaft 4 through the operating device 25, the driven shaft 1 drives the brake shaft 4 to rotate, the brake shaft 4 drives the center shaft 56 to rotate, the rotor 53 on the center shaft 56 rotates to receive resistance, the motor 5 provides resistance to form traction force, braking resistance is provided for the brake shaft 4, the driven shaft 1 and the differential mechanism 7, and meanwhile, the power output of the original automobile is closed, so that the electric automobile is decelerated.

The stator 52 of the motor 5 rotates after being stressed, the movable seat 62 is driven to move by the crank 551 and the connecting rod 552, the movable seat 62 drives the first piston 642 and the first cylinder 641 to move by the first pull wire 63, the first cylinder 641 drives the brake pedal 3 to press down by the first connecting rope 644, and when the brake failure is caused by the failure of the electronic power assisting system, the utility model can also provide power assisting and automatic braking, so that the original brake system of the automobile works normally.

Example 2: an emergency device for a new energy automobile with a brake failure is different from embodiment 1 in that the operation part 251 is a straight pull type handbrake.

Example 3: an emergency device for a new energy automobile with a brake failure is different from embodiment 1 in that the operation part 251 is a foot-operated hand brake.

Example 4: the emergency device for the brake failure of a new energy vehicle is different from the embodiment 1 in that the transmission from the crank 551 to the brake pedal 3 can also be carried out hydraulically.

Example 5: the emergency device for the brake failure of the new energy automobile is different from embodiment 1 in that, as shown in fig. 10, the large gear 41 is not mounted on the brake shaft 4 but mounted on the outer peripheral wall of the housing 22 between the release bearings 24.

Claims (10)

1. The utility model provides a new energy automobile brake failure's emergency device which characterized in that: the electric automobile differential mechanism comprises a driven shaft (1), a combining device (2), an operating device (25), a brake shaft (4) and a traction force source, wherein the driven shaft (1) is connected with the electric automobile differential mechanism (7), the operating device (25) is used for driving the combining device (2) to combine the driven shaft (1) with the brake shaft (4), and the traction force source is connected with the brake shaft (4).

2. The emergency device for brake failure of a new energy automobile according to claim 1, wherein: the traction force source comprises one or more motors (5).

3. The emergency device for brake failure of a new energy automobile according to claim 2, wherein: the motor (5) comprises a shell (51), a stator (52), a rotor (53) and a plurality of elastic components (54), wherein the stator (52) can rotate in the shell (51), the elastic components (54) are elastically acted on the stator (52) to drive the rotated stator (52) to return, the shell (51) is provided with a perforation (511), the stator (52) is hinged with a movable part (55), the movable part (55) passes through the perforation (511) and then is positioned outside the shell (51), the movable part (55) is connected with a wire pulling mechanism (6), and the wire pulling mechanism (6) is used for pulling a brake pedal (3) of an original vehicle.

4. The emergency device for brake failure of a new energy automobile according to claim 3, wherein: the movable piece (55) comprises a crank (551) hinged to the stator (52), a connecting rod (552) hinged to the crank (551), the crank (551) penetrates through the through hole (511), the wire pulling mechanism (6) comprises a support (61), a movable seat (62) movably arranged on the support (61) and a first wire pulling device (63), the connecting rod (552) is hinged to the movable seat (62), and one end of the first wire pulling device (63) is fixed to the movable seat (62) while the other end of the first wire pulling device is used for driving the brake pedal (3) to move.

5. The emergency device for brake failure of a new energy automobile according to claim 4, wherein: be equipped with first resilient means (64) on first acting as go-between (63), first resilient means (64) include first barrel (641), first piston (642), first spring (643) both ends link respectively first barrel (641) with on first piston (642), first acting as go-between (63) with first piston (642) link to each other, first barrel (641) link to each other with brake pedal (3) through first connecting rope (644).

6. The emergency device for brake failure of a new energy automobile according to claim 2, 3 or 4, wherein: the traction force source comprises a central shaft (56), a pinion (561) and a large gear (41), wherein the central shaft (56) is shared by a plurality of motors (5), the pinion (561) is installed and fixed on the central shaft (56), the large gear (41) is installed on the brake shaft (4) or the large gear (41) is installed on the combining device (2), and the large gear (41) is meshed with the pinion (561).

7. The emergency device for brake failure of a new energy automobile according to claim 1 or 2 or 3 or 4, wherein: the combination device (2) comprises a brake disc (21) fixed on a driven shaft (1), a sleeve (22) fixed on a brake shaft (4), a fixing part, a shifting fork (23) hinged to the fixing part, a bearing (24) and an operating device (25), wherein the sleeve (22) is sleeved on the brake disc (21), a notch (221) is formed in the end face of the sleeve (22), a brake pad (26) is arranged in the notch (221), an inner ring and an outer ring of the bearing (24) are respectively contacted with the shifting fork (23) and the brake pad (26), and the operating device (25) is used for driving the shifting fork (23) to swing.

8. The emergency device for brake failure of a new energy automobile according to claim 7, wherein: the notch (221) is provided with a first guide inclined plane (222), and the first guide inclined plane (222) guides the brake disc (21) to lean against the brake disc (21) after the brake pad (26) receives the friction force of the brake disc (21).

9. The emergency device for brake failure of a new energy automobile according to claim 7, wherein: the utility model discloses a brake axle (4) of electric motor, including cover shell (22), bearing (24), brake block (26), gear box (25), gear box (22) both ends are equipped with a plurality of notch (221), every cover shell (22) both sides are equipped with two shift fork (23), two still be equipped with cam (27) between shift fork (23), shift fork (23) support on cam (27) curved surface, two still be connected with return spring (28) between shift fork (23), operating means (25) drive two through driving cam (27) rotate shift fork (23) swing, bearing (24) are release bearing (24) and quantity are two, every bearing (24) all are located shift fork (23) with between brake block (26), bearing (24) cover is in on brake axle (4) and be clearance fit.

10. The emergency device for brake failure of a new energy automobile according to claim 9, wherein: the operating device (25) comprises an operating part (251), a second stay wire (252) and a second elastic device (253), wherein the operating part (251) is one of a traditional hand brake, a straight-pull hand brake and a foot-operated hand brake, the second elastic device (253) comprises a second cylinder (2531), a second piston (2532) and a second spring (2533), two ends of the second spring (2533) respectively prop against the second piston (2532) and the second cylinder (2531), two ends of the second stay wire (252) are respectively fixed on the operating part (251) and the second piston (2532), and the second cylinder (2531) is fixed on the cam (27) or the shifting fork (23) through a second connecting rod (2534).

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