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CN-122009120-A - Automobile, braking system, brake and state monitoring method of brake

CN122009120ACN 122009120 ACN122009120 ACN 122009120ACN-122009120-A

Abstract

The invention discloses an automobile, a braking system, a brake and a state monitoring method of the brake. In the brake, the flange rotor is connected with the motor rotating shaft and also connected with the stator in a rolling way, so that the flange rotor can rotate relative to the stator along with the braking motor rotating shaft. The stator is provided with a flange rotor, a slot disc is arranged on the stator, an armature is connected with the flange rotor through an elastic piece so that the armature can reciprocate between the flange rotor and the slot disc along the axial direction of the flange rotor, and a permanent magnet generates a first magnetic force on the armature. Under the condition that the coil is powered off, the first magnetic force resists the reset pulling force, so that the armature moves towards the groove disc and is correspondingly attracted with the groove disc. The coil is electrified to generate a second magnetic force on the armature, and the resultant force of the second magnetic force and the reset pulling force resists the first magnetic force, so that the armature moves towards the flange rotor and is separated from the groove disc, locking and releasing of the braking motor are realized, the brake is integrated on the motor, the volume, noise and energy loss of a braking system are reduced, and the manufacturing difficulty and the testing difficulty are reduced.

Inventors

  • ZHANG DONGSHENG
  • HU ZHENFEI
  • LV YAN

Assignees

  • 耐世特汽车系统（苏州）有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (10)

  1. 1. The power-off brake is characterized by being applied to a brake motor of an electromechanical brake system; The power-off brake comprises a stator and a flange rotor which are coaxially and repeatedly sleeved around a rotating shaft of the brake motor, and a rolling bearing, a groove disc, an armature, an elastic piece, a permanent magnet and a coil; The flange rotor is connected with a rotating shaft of the brake motor and also connected with the stator through a rolling bearing so that the flange rotor can rotate relative to the stator along with the rotating shaft of the brake motor; the groove disc is arranged on one side, close to the flange rotor, of the stator; the armature is arranged between the groove disc and the flange rotor and connected with the flange rotor through the elastic piece so that the armature can reciprocate between the flange rotor and the groove disc along the axial direction of the flange rotor; The permanent magnet is arranged on the stator, and generates a first magnetic force on the armature, wherein the first magnetic force is opposite to the direction of the restoring tension of the elastic piece to the armature and is larger than the restoring tension of the elastic piece to the armature; The coil is arranged on the stator, the coil after being electrified generates second magnetic force on the armature, the second magnetic force is opposite to the first magnetic force, the resultant force of the second magnetic force and the reset pulling force is larger than the first magnetic force, and under the condition that the coil is electrified, the resultant force of the second magnetic force and the reset pulling force resists the first magnetic force, so that the armature moves towards the flange rotor and is separated from the groove disc, and the rotating shaft of the brake motor is released.
  2. 2. The power-off brake of claim 1, further comprising a micro switch; The micro switch is arranged on the stator, is triggered to be turned on under the condition that the armature is attracted to the groove disc, and is turned off under the condition that the armature is separated from the groove disc.
  3. 3. The power-off brake according to claim 2, wherein the micro switch includes two micro spring pieces, a state detecting member, and an output terminal, root portions of the two micro spring pieces and the output terminal are connected to the state detecting member, respectively, end portions of the micro spring pieces extend beyond the basin in a first direction so that the two micro spring pieces are disconnected from each other in a case where the armature is disengaged from the basin, and the two micro spring pieces are conducted via the armature in a case where the armature is engaged with the basin; the state detection piece is used for generating a disengagement state signal and outputting the disengagement state signal to the outside through the output terminal under the condition that the two micro-motion reeds are disconnected, and generating an attraction state signal and outputting the disengagement state signal to the outside through the output terminal under the condition that the two micro-motion reeds are conducted.
  4. 4. The power-off actuator of claim 1, wherein the resilient member comprises a belleville spring or a leaf spring.
  5. 5. An electromechanical brake system comprising a brake rotor, a brake caliper, a gear box, a brake motor, and a power-off brake as defined in any one of claims 1-4, wherein the power-off brake is integrated with the brake motor as a motor assembly.
  6. 6. The electromechanical brake system according to claim 5, wherein the motor assembly further comprises a protective collar; one end of the protection ferrule is sleeved and arranged on the side surface of the end cover of the brake motor, and forms an annular groove together with the outer surface of the end cover and the rotating shaft of the brake motor; the power-off brake is arranged in the annular groove, a stator of the power-off brake is connected with the end cover through bolts, and a flange rotor of the power-off brake is connected with the rotating shaft through a tooth-shaped spline.
  7. 7. The electromechanical brake system according to claim 6, wherein the motor assembly further includes a first thermal insulating damping washer and a second thermal insulating damping washer; the first heat-insulating damping washer is arranged between the stator and the end cover and used for reducing heat transmission and vibration transmission between the stator and the end cover; The second heat-insulating damping washer is arranged between the end face of the protection ferrule and the gear box and is used for reducing heat transmission and vibration transmission between the power-off brake and the gear box.
  8. 8. An automobile comprising an electromechanical brake system according to any one of claims 5 to 7.
  9. 9. The state monitoring method of the power failure controller is characterized by comprising the following steps of: Monitoring a real-time current in a coil with the coil energized; Determining that an armature of the power loss controller is disconnected when a sudden rise inflection point occurs in the real-time current in the coil; And when a sudden drop inflection point appears in the real-time current in the coil, determining the armature actuation of the power failure controller.
  10. 10. The method of claim 9, further comprising, while monitoring the real-time current in the coil: monitoring the on-off state of the micro switch; determining that the armature of the power loss controller is disconnected under the condition that the microswitch is turned off; and under the condition that the micro switch is conducted, determining the armature actuation of the power failure controller.

Description

Automobile, braking system, brake and state monitoring method of brake Technical Field The invention relates to the field of automobile manufacturing, in particular to an automobile, a braking system, a brake and a state monitoring method of the brake. Background With the rapid development of the automobile industry and related technical fields, an electronic mechanical brake system becomes a research hot spot of various large-vehicle enterprises and scientific research institutions. The electronic mechanical braking system adopts a ratchet and pawl structure or an electromagnetic brake to lock the braking mechanism, so that auxiliary braking is realized, and braking safety is improved. However, the existing ratchet pawl structure and the common electromagnetic brake have great limitations, the ratchet pawl structure has the problems of large volume, large energy loss and high noise, and the common electromagnetic brake has the problems of high manufacturing difficulty and inconvenient state test, so that the development of an electromechanical brake system is limited. Disclosure of Invention The invention provides an automobile, a braking system, a brake and a state monitoring method of the brake, so as to reduce the volume, noise and energy loss and reduce the manufacturing difficulty and the testing difficulty. According to an aspect of the present invention, there is provided a power-off brake applied to a brake motor of an electromechanical brake system; The power-off brake comprises a stator and a flange rotor which are coaxially and repeatedly sleeved around a rotating shaft of the brake motor, and a rolling bearing, a groove disc, an armature, an elastic piece, a permanent magnet and a coil; The flange rotor is connected with a rotating shaft of the brake motor and also connected with the stator through a rolling bearing so that the flange rotor can rotate relative to the stator along with the rotating shaft of the brake motor; The groove disc is arranged on one side of the stator, which is close to the stator; the armature is arranged between the groove disc and the flange rotor and connected with the flange rotor through the elastic piece so that the armature can reciprocate between the flange rotor and the groove disc along the axial direction of the flange rotor; The permanent magnet is arranged on the stator, and generates a first magnetic force on the armature, wherein the first magnetic force is opposite to the direction of the restoring tension of the elastic piece to the armature and is larger than the restoring tension of the elastic piece to the armature; The coil is arranged on the stator, the coil after being electrified generates second magnetic force on the armature, the second magnetic force is opposite to the first magnetic force, the resultant force of the second magnetic force and the reset pulling force is larger than the first magnetic force, and under the condition that the coil is electrified, the resultant force of the second magnetic force and the reset pulling force resists the first magnetic force, so that the armature moves towards the flange rotor and is separated from the groove disc, and the rotating shaft of the brake motor is released. Optionally, the power-off brake further comprises a micro switch; The micro switch is arranged on the stator, is triggered to be turned on under the condition that the armature is attracted to the groove disc, and is turned off under the condition that the armature is separated from the groove disc. Optionally, the micro switch includes two micro spring pieces, a state detecting piece and an output terminal, the root parts of the two micro spring pieces and the output terminal are respectively connected with the state detecting piece, the end parts of the micro spring pieces exceed the groove disc in a first direction, so that when the armature is separated from the groove disc, the two micro spring pieces are disconnected, and when the armature is attracted to the groove disc, the two micro spring pieces are conducted through the armature; the state detection piece is used for generating a disengagement state signal and outputting the disengagement state signal to the outside through the output terminal under the condition that the two micro-motion reeds are disconnected, and generating an attraction state signal and outputting the disengagement state signal to the outside through the output terminal under the condition that the two micro-motion reeds are conducted. Optionally, the elastic member comprises a belleville spring or a leaf spring. According to another aspect of the present invention there is provided an electromechanical brake system comprising a brake disc, a brake caliper, a gearbox, a brake motor and a power-off brake according to any one of claims 1 to 4, wherein said power-off brake is integrated with said brake motor as one motor assembly. Optionally, the motor assembly further comprises a protective collar; one end