High-safety brake-by-wire motor

Abstract

The invention relates to the technical field of vehicle brake-by-wire motors, in particular to a high-safety brake-by-wire motor. The first matching sleeve and the second matching sleeve are arranged on a power output shaft of the motor body in a sleeving mode. The second matching sleeve is sleeved with the first matching ring. The first matching ring is used for being in transmission fit with a brake execution mechanism of the brake-by-wire system. The second matching sleeve is in transmission fit with the positioning rod, and the positioning rod extends in the axial direction of the second matching sleeve and extends out of the second matching sleeve. The position detection sensor is used for detecting the displacement amount of the positioning rod and electrically connected with the processor. The processor is used for judging whether the rotation stroke control of the motor body is accurate or not according to the corresponding relation between the rotation amount of the motor body and the displacement amount of the positioning rod in the self-checking state. The self-inspection of the rotation stroke precision can be realized according to actual needs, the safety and reliability of the brake-by-wire motor are further improved, and the driving safety of the vehicle is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle brake-by-wire motors, and in particular to a high-safety brake-by-wire motor. Background Art

[0002] The brake-by-wire system has attracted more and more attention due to its significantly improved response speed, adaptability to intelligent driving and safety redundancy. The brake-by-wire motor is one of the core components of the brake-by-wire system, and the rotation stroke accuracy of the brake-by-wire motor is directly related to the braking accuracy and braking safety.

[0003] At present, in order to ensure that the brake-by-wire motor has sufficient rotational stroke accuracy, it is usually carried out through regular inspection and maintenance. Not only is the workload large, but there is also a risk of inspection period. If the vehicle's brake-by-wire motor has a problem within the interval between two inspections, it may cause braking failure, which poses a huge hidden danger to vehicle safety.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The purpose of the present invention is to provide a high-safety brake-by-wire motor, which can realize self-inspection of rotational stroke accuracy according to actual needs, effectively reducing the probability of problems occurring in the brake-by-wire motor during the interval between two inspections, further improving the safety and reliability of the brake-by-wire motor, and contributing to further improving vehicle driving safety.

[0006] The embodiment of the present invention is achieved as follows: A high-safety brake-by-wire motor comprises a motor body, a first matching sleeve, a second matching sleeve, a first matching ring, a position detection sensor and a processor.

[0007] The first matching sleeve and the second matching sleeve are both sleeved on the power output shaft of the motor body, and the first matching sleeve is located on the side of the second matching sleeve close to the motor body. Along the axial direction of the power output shaft, the first matching sleeve and the second matching sleeve are both slidably matched with the power output shaft and driven by the driver. Along the circumferential direction of the power output shaft, the first matching sleeve and the second matching sleeve are both fixedly matched with the power output shaft.

[0008] The first matching ring is sleeved on the second matching sleeve. Along the axial direction of the second matching sleeve, the first matching ring and the second matching sleeve are slidably matched. Along the circumferential direction of the second matching sleeve, the first matching ring and the second matching sleeve are fixedly matched. The first matching ring is used for transmission matching with the brake actuator of the wire control brake system.

[0009] The second matching sleeve has an annular inner cavity, which is coaxially arranged with the second matching sleeve. An annular notch communicating with the annular inner cavity is provided on an end wall of the second matching sleeve close to the first matching sleeve, and the annular notch is coaxially arranged with the second matching sleeve.

[0010] The first matching sleeve is coaxially fixedly connected with a control ring near one end wall of the first matching sleeve, and the control ring is rotatably matched with the annular notch. A driving ring is also arranged in the annular inner cavity. Along the axial direction of the second matching sleeve, the driving ring is slidably matched with the annular inner cavity. Along the circumferential direction of the second matching sleeve, the driving ring is fixedly matched with the annular inner cavity. The control ring is threadedly matched with the driving ring.

[0011] One end of the driving ring away from the first matching sleeve is fixedly connected with a positioning rod, and the positioning rod extends along the axial direction of the second matching sleeve and extends to the outside of the second matching sleeve.

[0012] The position detection sensor is used to detect the displacement of the positioning rod, and the position detection sensor is electrically connected to the processor.

[0013] Along the axial direction of the power output shaft, the first matching sleeve and the second matching sleeve have a first matching point and a second matching point. When the first matching sleeve and the second matching sleeve are located at the first matching point, both the first matching sleeve and the second matching sleeve are in transmission matching with the power output shaft, and the second matching sleeve is in transmission matching with the first matching ring, and the high-safety wire-controlled brake motor is in a working state. When the first matching sleeve and the second matching sleeve are located at the second matching point, the second matching sleeve is separated from the power output shaft, and the second matching sleeve is in transmission matching with the first matching ring, and the high-safety wire-controlled brake motor is in a self-checking state.

[0014] The processor is used to determine whether the rotation stroke control of the motor body is accurate according to the corresponding relationship between the rotation amount of the motor body and the displacement amount of the positioning rod in the self-checking state.

[0015] Furthermore, the high-safety brake-by-wire motor also includes: a second matching ring.

[0016] The second matching ring is coaxially arranged with the first matching ring and is located at a side of the first matching ring away from the motor body. The second matching ring is used to match with the second matching sleeve.

[0017] When in the working state, the second matching sleeve is separated from the second matching ring. When in the self-checking state, the second matching sleeve is matched with the second matching ring.

[0018] Among them, the second mating ring is constructed as follows: when the high-safety wire-controlled brake motor is in a working state and the motor body is in an initial state, the mating parts between the second mating sleeve and the second mating ring are aligned, so that when the driver drives the first mating sleeve and the second mating sleeve to the second mating point, the second mating sleeve can smoothly cooperate with the second mating ring.

[0019] Furthermore, the position detection sensor includes: a magnetostrictive displacement sensor.

[0020] The waveguide rod of the magnetostrictive displacement sensor is coaxially arranged with the second matching ring and extends into the second matching ring. The end of the waveguide rod is provided with a stopper for preventing the magnetic ring of the magnetostrictive displacement sensor from falling out. The magnetic ring is matched with an elastic member to push the magnetic ring to the side where the stopper is located. The outer diameter of the magnetic ring is smaller than the inner diameter of the second matching ring, and the outer diameter of the stopper is smaller than the inner diameter of the second matching sleeve.

[0021] When the high-safety brake-by-wire motor is in a self-test state, the second matching sleeve pushes the magnetic ring to the side away from the stopper. The processor is used to determine whether the second matching sleeve has moved into place according to the displacement of the magnetic ring pushed by the second matching sleeve, and to determine whether the rotation stroke control of the motor body is accurate according to the corresponding relationship between the displacement of the magnetic ring pushed by the positioning rod and the rotation amount of the motor body.

[0022] Furthermore, the end faces of the first matching sleeve and the second matching sleeve are spaced apart from each other.

[0023] Furthermore, a rotational seal is formed between the control ring and the annular notch, the control ring is in contact with and rotationally sealed against an inner wall of one side of the annular cavity, a rotational seal is formed between the drive ring and the control ring, the drive ring is in contact with and slidingly sealed against an inner wall of the other side of the annular cavity, and a sliding seal is formed between the positioning rod and the second matching sleeve.

[0024] The annular inner cavity is also provided with an air supply hole, which extends from the annular inner cavity to the outer side wall of the second matching sleeve.

[0025] The second matching ring has an air delivery cavity, and the inner ring wall of the second matching ring is provided with a first opening and a second opening connected to the air delivery cavity. The first opening is used to communicate with the air delivery hole, and the second opening is distributed on the matching surface of the second matching ring for matching with the second matching sleeve.

[0026] A temperature sensor and an air pressure sensor are arranged in the air supply cavity, and both the temperature sensor and the air pressure sensor are electrically connected to the processor.

[0027] When the high-safety brake-by-wire motor is in a self-test state, the air supply hole is connected to the first opening, and when the motor body rotates, the drive ring can push the gas in the annular inner cavity into the air supply inner cavity through the air supply hole and the first opening, and the processor is used to determine whether there is a defect in the mating surface of the second mating sleeve used to cooperate with the second mating ring according to the rotation amount of the motor body, the detection data of the temperature sensor and the detection data of the air pressure sensor.

[0028] Furthermore, both the first matching ring and the second matching ring are matched with the second matching sleeve through a spline structure. The outer wall of the second matching sleeve is provided with spline teeth, and the inner ring walls of the first matching ring and the second matching ring are provided with spline grooves.

[0029] The tooth top surface of the spline teeth of the outer wall of the second matching sleeve is a plane and fits with the groove bottom of the spline groove of the inner ring wall of the second matching ring. The air supply hole is opened on the tooth top surface of the spline teeth of the second matching sleeve, the first opening is opened on the groove bottom of the spline groove of the second matching ring, and the second opening is opened on the groove side wall of the spline groove of the second matching ring.

[0030] Furthermore, both the first matching sleeve and the second matching sleeve are matched with the power output shaft through a spline structure.

[0031] Furthermore, an air pressure balance hole is provided on the inner wall of one end of the annular inner cavity close to the first matching sleeve, and the air pressure balance hole extends to an end surface of one end of the second matching sleeve close to the first matching sleeve.

[0032] Furthermore, the air supply inner cavity is annular, and the air supply inner cavity is coaxially arranged with the second matching ring. The side walls of both sides of each spline groove are provided with a second opening.

[0033] Furthermore, an arc-shaped piece is arranged in the air supply cavity, and the arc-shaped piece is slidably matched in the air supply cavity with damping and is slidably sealed with the inner wall of the air supply cavity.

[0034] The center angle corresponding to the arc-shaped member is greater than the center angle corresponding to at least two spline grooves of the second matching ring, so that the arc-shaped member closes the second openings of at least two spline grooves of the second matching ring at the same time.

[0035] There are two arc-shaped pieces, which are arranged at intervals and on both sides of the first opening.

[0036] The sliding damping of the arc-shaped member is set as follows: when the driving ring pushes the gas into the gas delivery cavity, the air pressure on the side of the arc-shaped member close to the first opening reaches the air pressure threshold, and the arc-shaped member is pushed.

[0037] The beneficial effects of the technical solution of the embodiment of the present invention include: The high-safety brake-by-wire motor provided by the embodiment of the present invention can implement self-inspection of rotational stroke accuracy according to actual needs, effectively reducing the probability of problems occurring in the brake-by-wire motor within the interval between two inspections, further improving the safety and reliability of the brake-by-wire motor, and contributing to further improving vehicle driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A schematic diagram of the overall structure of a high-safety brake-by-wire motor provided by an embodiment of the present invention (when in working state); Figure 2 for Figure 1 A schematic diagram of the states of the first matching sleeve and the second matching sleeve of a medium-to-high safety brake-by-wire motor; Figure 3 is a schematic structural diagram of the annular inner cavity of the second matching sleeve; Figure 4 A schematic diagram of the overall structure of a high-safety brake-by-wire motor provided by an embodiment of the present invention (in a detection state, and the detection has not started); Figure 5 for Figure 4 A schematic diagram of the states of the first matching sleeve and the second matching sleeve of a medium-to-high safety brake-by-wire motor; Figure 6 A schematic diagram of the overall structure of a high-safety brake-by-wire motor provided by an embodiment of the present invention (after detection begins); Figure 7 for Figure 6 A schematic diagram of the states of the first matching sleeve and the second matching sleeve of a medium-to-high safety brake-by-wire motor; Figure 8 is a schematic diagram of the cooperation between the second cooperation sleeve and the second cooperation ring; Fig. 9 is a schematic structural diagram of a second matching sleeve; Fig.10 is a schematic structural diagram of a second mating ring; Fig.11 A schematic diagram of the cooperation between the second cooperation sleeve and the second cooperation ring before the start of the test (when the arc-shaped piece is provided); Fig.12 It is a schematic diagram of the cooperation between the second cooperation sleeve and the second cooperation ring during the detection process (when the arc-shaped part is provided).

[0040] Description of reference numerals: Motor body 100; power output shaft 110; protective shell 120; opening 121; first matching sleeve 200; control ring 210; second matching sleeve 300; annular inner cavity 310; drive ring 320; positioning rod 330; air supply hole 340; air pressure balance hole 350; first matching ring 400; second matching ring 500; air supply inner cavity 510; first opening 520; second opening 530; arc member 540; stop block 550; position detection sensor 600; waveguide rod 610; stop member 620; magnetic ring 630; tooth top surface 710; groove bottom 720; groove side wall 730. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0045] In addition, the terms "parallel", "vertical", etc. do not mean that the components must be absolutely parallel or vertical, but can be slightly tilted. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly tilted.

[0046] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In order to overcome the shortcomings of the prior art, please refer to Figure 1-Figure 7 This embodiment provides a high-safety wire-controlled brake motor, which includes: a motor body 100, a protective shell 120, a first matching sleeve 200, a second matching sleeve 300, a first matching ring 400, a position detection sensor 600 and a processor (not shown in the figure).

[0048] It can be understood that the motor body 100 can be equipped with the required speed reduction mechanism according to actual needs.

[0049] The protective shell 120 is disposed on the outer wall of the motor body 100 , and the power output shaft 110 of the motor body 100 is located inside the protective shell 120 . The first matching sleeve 200 , the second matching sleeve 300 , the first matching ring 400 and the position detection sensor 600 are all disposed inside the protective shell 120 .

[0050] The first matching sleeve 200 and the second matching sleeve 300 are both sleeved on the power output shaft 110 of the motor body 100, and are coaxially arranged with the power output shaft 110. The first matching sleeve 200 is located on a side of the second matching sleeve 300 close to the motor body 100.

[0051] Along the axial direction of the power output shaft 110, the first mating sleeve 200 and the second mating sleeve 300 are both slidably matched with the power output shaft 110, and the first mating sleeve 200 and the second mating sleeve 300 are driven by a driver (not shown in the figure) so that the first mating sleeve 200 and the second mating sleeve 300 can move along the axial direction of the power output shaft 110.

[0052] Along the circumference of the power output shaft 110 , the first matching sleeve 200 and the second matching sleeve 300 are both fixedly matched with the power output shaft 110 , that is, when the power output shaft 110 rotates, the first matching sleeve 200 and the second matching sleeve 300 can be driven to rotate synchronously.

[0053] The first matching ring 400 is rotatably installed in the protective shell 120 . The first matching ring 400 is coaxially arranged with the second matching sleeve 300 . The first matching ring 400 is sleeved in the second matching sleeve 300 . The first matching ring 400 is spaced apart from the power output shaft 110 .

[0054] The first matching ring 400 is slidably matched with the second matching sleeve 300 along the axial direction of the second matching sleeve 300. The first matching ring 400 is fixedly matched with the second matching sleeve 300 along the circumferential direction of the second matching sleeve 300, that is, the second matching sleeve 300 can drive the first matching ring 400 to rotate when rotating.

[0055] The protective shell 120 is provided with an opening 121 for exposing the first mating ring 400. The first mating ring 400 is used for transmission cooperation with the brake actuator of the wire control brake system. That is to say, the motor body 100 transmits power to the outside through the first mating ring 400, so that the actuator of the wire control brake system performs related braking operations.

[0056] The second matching sleeve 300 has an annular inner cavity 310, which is coaxially arranged with the second matching sleeve 300. An annular notch communicating with the annular inner cavity 310 is formed on one end wall of the second matching sleeve 300 close to the first matching sleeve 200, and the annular notch is coaxially arranged with the second matching sleeve 300.

[0057] A control ring 210 is coaxially fixedly connected to the end wall of the first matching sleeve 200 close to the first matching sleeve 200. The inner diameter of the control ring 210 is larger than the outer diameter of the power output shaft 110, and the outer diameter of the control ring 210 is smaller than the outer diameter of the second matching sleeve 300. The control ring 210 can be rotatably matched with the annular gap and extend into the annular inner cavity 310 through the annular gap.

[0058] A driving ring 320 is also provided in the annular inner cavity 310. The driving ring 320 is slidably matched with the annular inner cavity 310 along the axial direction of the second matching sleeve 300. The driving ring 320 is fixedly matched with the annular inner cavity 310 along the circumferential direction of the second matching sleeve 300. The control ring 210 is threadedly matched with the driving ring 320.

[0059] In this embodiment, the driving ring 320 is sleeved on the control ring 210. In other embodiments of the present invention, the control ring 210 may be sleeved on the driving ring 320.

[0060] Back to the present embodiment, one end of the driving ring 320 away from the first mating sleeve 200 is fixedly connected with a positioning rod 330 , the positioning rod 330 extends along the axial direction of the second mating sleeve 300 and passes through the outside of the second mating sleeve 300 , and the positioning rod 330 can be slidably engaged with the second mating sleeve 300 .

[0061] The position detection sensor 600 is used to detect the displacement of the positioning rod 330 , and the position detection sensor 600 is electrically connected to the processor.

[0062] Along the axial direction of the power output shaft 110 , the first matching sleeve 200 and the second matching sleeve 300 both have a first matching point and a second matching point.

[0063] When the first matching sleeve 200 and the second matching sleeve 300 are located at the first matching point, Figure 4 and Figure 5 As shown, the power output shaft 110 extends into the second matching sleeve 300, the first matching sleeve 200 and the second matching sleeve 300 are both in driving cooperation with the power output shaft 110, and the end of the second matching sleeve 300 away from the first matching sleeve 200 is in driving cooperation with the first matching ring 400. At this time, the high-safety brake-by-wire motor is in a working state, in which the power output shaft 110 of the motor body 100 rotates, and the second matching sleeve 300 and the first matching sleeve 200 can be smoothly driven, and the second matching sleeve 300 can smoothly drive the first matching ring 400, and the first matching ring 400 can make the actuator of the brake-by-wire system perform related braking operations.

[0064] When the first matching sleeve 200 and the second matching sleeve 300 are located at the second matching point, as shown in FIG. Figure 6 and Figure 7As shown, the end of the power output shaft 110 moves from the second matching sleeve 300 to the first matching sleeve 200, the second matching sleeve 300 is separated from the power output shaft 110, the first matching sleeve 200 and the power output shaft 110 maintain transmission matching, and the end of the second matching sleeve 300 close to the first matching sleeve 200 is in transmission matching with the first matching ring 400. At this time, the high-safety wire-controlled brake motor is in a self-test state. In this state, when the power output shaft 110 of the motor body 100 rotates, it can only drive the first matching sleeve 200, the first matching sleeve 200 will rotate relative to the second matching sleeve 300, and the second matching sleeve 300 will not rotate. At this time, the motor body 100 can be tested for the rotation stroke control accuracy without affecting the working state of the wire-controlled brake system.

[0065] The switching of the first mating sleeve 200 and the second mating sleeve 300 between the first mating point position and the second mating point position is achieved by a driver.

[0066] It can be understood that the appropriate switching of the high-safety electronic control brake motor to the self-test state can be flexibly selected according to actual needs, including but not limited to after the car is parked and the engine is turned off and the handbrake is pulled, it can also be triggered according to the driver's instructions in the parked and engine turned off state, and is not limited to this.

[0067] In the self-test state, the processor can send a braking instruction to the motor body 100 according to the preset instruction, and the motor body 100 rotates the corresponding rotation stroke (number of rotations) according to the braking instruction. During this process, the first mating sleeve 200 uses the control ring 210 to make the drive ring 320 move to the side away from the first mating sleeve 200, and the drive ring 320 pushes the positioning rod 330 further out of the second mating sleeve 300. The position detection sensor 600 can detect the change in the displacement of the positioning rod 330.

[0068] If the rotation stroke control of the motor body 100 is accurate, then the number of rotations specified by the braking instruction sent to it is the same as the number of rotations actually rotated by the motor body 100, and then the displacement of the positioning rod 330 should correspond to the number of rotations specified by the braking instruction. In other words, when the displacement of the positioning rod 330 corresponds to the number of rotations specified by the braking instruction, it means that the rotation stroke control of the motor body 100 is accurate; and when the displacement of the positioning rod 330 does not correspond to the number of rotations specified by the braking instruction (whether it is too large or too small), it means that the rotation stroke control of the motor body 100 is not accurate, and the motor body 100 needs to be inspected and repaired, and the processor sends a fault reminder to the user.

[0069] That is, the processor can determine whether the rotation stroke control of the motor body 100 is accurate based on the corresponding relationship between the rotation amount of the motor body 100 and the displacement amount of the positioning rod 330 in the self-check state.

[0070] In this way, the high-safety brake-by-wire motor can perform precision self-inspection on demand without having to go to a designated maintenance station for inspection every time. This also makes up for the defect of long intervals when going to the maintenance station for inspection, and can effectively increase the inspection frequency of high-safety brake-by-wire motors, fully ensuring driving safety.

[0071] In general, the high-safety brake-by-wire motor provided in this embodiment can implement self-inspection of rotational stroke accuracy according to actual needs, effectively reducing the probability of problems occurring in the brake-by-wire motor during the interval between two inspections, further improving the safety and reliability of the brake-by-wire motor, and contributing to further improving vehicle driving safety.

[0072] In this embodiment, in the self-test state, when the motor body 100 is not in motion, that is, when the motor body 100 is still in the initial state, the end surface of the positioning rod 330 away from the driving ring 320 is flush with the end surface of the second matching sleeve 300 away from the first matching sleeve 200.

[0073] During the detection process, when the motor body 100 starts to operate, the driving ring 320 moves to a side away from the first matching sleeve 200 , and the positioning rod 330 further extends out of the second matching sleeve 300 .

[0074] It should be noted that during the detection process, after the motor body 100 is actuated each time to further drive the positioning rod 330 to the outside of the second matching sleeve 300, it is necessary to actuate in the opposite direction by an equal amount (rotate in the opposite direction by the same number of turns) to fully reset the positioning rod 330, and also to fully reset the power output shaft 110 and the first matching sleeve 200, so that the first matching sleeve 200 and the second matching sleeve 300 can accurately and smoothly return to the first matching point. During the resetting process, the position detection sensor 600 can also be used to detect the reverse rotation stroke control accuracy of the motor body 100.

[0075] In particular, when a problem with the rotational stroke control accuracy of the motor body 100 is found during the detection process, the positioning rod 330 can be accurately reset with the help of the position detection sensor 600 during resetting, and the power output shaft 110 and the first matching sleeve 200 can be fully reset at the same time.

[0076] In this embodiment, the high-safety brake-by-wire motor further includes: a second matching ring 500 .

[0077] The second mating ring 500 is fixedly installed in the protective shell 120 , and is coaxially spaced apart from the first mating ring 400 and located on a side of the first mating ring 400 away from the motor body 100 . The second mating ring 500 is used to be mated with the second mating sleeve 300 .

[0078] When in the working state, the second matching sleeve 300 is separated from the second matching ring 500. When in the self-test state, one end of the second matching sleeve 300 away from the second matching sleeve 300 extends into the second matching ring 500 and matches with the second matching ring 500.

[0079] The second matching sleeve 300 is slidably matched with the second matching ring 500 along the axial direction of the second matching ring 500. The second matching sleeve 300 is fixedly matched with the second matching ring 500 along the circumferential direction of the second matching ring 500.

[0080] Among them, the second mating ring 500 is constructed as follows: when the high-safety wire-controlled brake motor is in a working state and the motor body 100 is in an initial state (that is, when the motor body 100 is fully reset and not actuated), the mating parts between the second mating sleeve 300 and the second mating ring 500 are aligned, so that when the driver drives the first mating sleeve 200 and the second mating sleeve 300 to the second mating point, the second mating sleeve 300 can smoothly cooperate with the second mating ring 500.

[0081] With this design, the second matching ring 500 can be used to detect the matching surface of the outer wall of the second matching sleeve 300. When the driver drives the first matching sleeve 200 and the second matching sleeve 300 to the second matching point, if the second matching sleeve 300 can be matched with the second matching ring 500 smoothly, it means that the matching surface of the outer wall of the second matching sleeve 300 has not been deformed. If the second matching sleeve 300 cannot be matched with the second matching ring 500 smoothly, it means that the matching surface of the outer wall of the second matching sleeve 300 has been deformed and cannot be matched with the second matching ring 500 normally.

[0082] When the mating surface of the outer wall of the second mating sleeve 300 is deformed, it means that the mating surface of the inner wall of the first mating ring 400 is also likely to be deformed. At this time, the high-safety wire-controlled brake motor needs to be inspected and repaired.

[0083] The configuration of the inner ring wall of the second matching ring 500 is the same as the configuration of the inner ring wall of the first matching ring 400 .

[0084] Optionally, both the first matching sleeve 200 and the second matching sleeve 300 are matched with the power output shaft 110 through a spline structure, and both the first matching ring 400 and the second matching ring 500 are also matched with the second matching sleeve 300 through a spline structure.

[0085] In this embodiment, the position detection sensor 600 may be a magnetostrictive displacement sensor, but is not limited thereto.

[0086] The magnetostrictive displacement sensor is located on a side of the second mating ring 500 away from the first mating ring 400. The waveguide rod 610 of the magnetostrictive displacement sensor is fixedly installed in the protective shell 120. The waveguide rod 610 of the magnetostrictive displacement sensor is coaxially arranged with the second mating ring 500 and extends into the second mating ring 500. A stopper 620 is provided at the end of the waveguide rod 610 to prevent the magnetic ring 630 of the magnetostrictive displacement sensor from escaping.

[0087] Along the axial direction of the waveguide rod 610, the magnetic ring 630 is slidably fitted in the protective shell 120, and the magnetic ring 630 is fitted with an elastic member (not shown in the figure), which abuts between the side of the magnetic ring 630 away from the first matching ring 400 and the end wall of the protective shell 120 away from the motor body 100, and the elastic member is used to push the magnetic ring 630 to the side where the stopper 620 is located. When the high-safety brake-by-wire motor is in working state, the magnetic ring 630 is fitted with the stopper 620.

[0088] The outer diameter of the magnetic ring 630 is smaller than the inner diameter of the second matching ring 500 and larger than the inner diameter of the second matching sleeve 300 . The outer diameter of the stopper 620 is smaller than the inner diameter of the second matching sleeve 300 .

[0089] When the high-safety brake-by-wire motor is in a self-test state, the second matching sleeve 300 pushes the magnetic ring 630 to a side away from the stopper 620 .

[0090] The processor is used to determine whether the second matching sleeve 300 has moved into place according to the displacement of the magnetic ring 630 pushed by the second matching sleeve 300, that is, it can be used to determine whether the high-safety wire-controlled brake motor has correctly entered the self-test state.

[0091] When the magnetic ring 630 abuts against the second matching sleeve 300 , the positioning rod 330 also fits with the surface of the magnetic ring 630 .

[0092] When testing the stroke control accuracy of the motor body 100, the extension of the positioning rod 330 will further push the magnetic ring 630 to move to the side away from the motor body 100. At this time, it is possible to judge whether the rotation stroke control of the motor body 100 is accurate based on the correspondence between the displacement of the magnetic ring 630 pushed by the positioning rod 330 and the rotation amount of the motor body 100.

[0093] That is to say, the position detection sensor 600 also has the function of detecting whether the high-safety brake-by-wire motor has correctly entered the self-check state.

[0094] Optionally, the end faces of the first mating sleeve 200 and the second mating sleeve 300 are spaced apart from each other, which can effectively reduce the mechanical wear between the first mating sleeve 200 and the second mating sleeve 300 .

[0095] Furthermore, the control ring 210 is rotationally sealed with the annular notch, the control ring 210 is in contact with the inner wall of one side of the annular cavity 310 (in the present embodiment, the control ring 210 is in contact with the inner wall of the annular cavity 310 close to its central axis) and rotationally sealed, the drive ring 320 is rotationally sealed with the control ring 210, the drive ring 320 is in contact with the inner wall of the other side of the annular cavity 310 (in the present embodiment, the drive ring 320 is in contact with the inner wall of the annular cavity 310 away from its central axis) and slidingly sealed, and the positioning rod 330 is slidingly sealed with the second mating sleeve 300.

[0096] The end wall of the annular inner cavity 310 away from the motor body 100 is also provided with an air delivery hole 340. Figure 5 , Figure 8 and Fig. 9 As shown, the air delivery hole 340 extends from the annular inner cavity 310 to the outer wall of the second matching sleeve 300 .

[0097] The second mating ring 500 has a gas delivery cavity 510, such as Figure 8 and Fig.10 As shown, the inner ring wall of the second matching ring 500 is provided with a first opening 520 and a second opening 530 communicating with the air supply cavity 510. The first opening 520 is used to communicate with the air supply hole 340, and the second opening 530 is distributed on the matching surface of the second matching ring 500 for matching with the second matching sleeve 300.

[0098] Specifically, the outer wall of the second mating sleeve 300 is provided with spline teeth, and the inner ring walls of the first mating ring 400 and the second mating ring 500 are provided with spline grooves.

[0099] The tooth top surface 710 of the spline teeth of the outer wall of the second matching sleeve 300 is a plane and fits with the groove bottom 720 of the spline groove of the inner ring wall of the second matching ring 500. The air supply hole 340 is provided on the tooth top surface 710 of the spline teeth of the second matching sleeve 300, the first opening 520 is provided on the groove bottom 720 of the spline groove of the second matching ring 500, and the second opening 530 is provided on the groove side wall 730 of the spline groove of the second matching ring 500.

[0100] A temperature sensor (not shown in the figure) and an air pressure sensor (not shown in the figure) are provided in the air supply inner cavity 510 , and both the temperature sensor and the air pressure sensor are electrically connected to the processor.

[0101] When the high-safety brake-by-wire motor is in the self-test state, the air supply hole 340 is connected to the first opening 520 . When the motor body 100 rotates, the drive ring 320 can push the gas in the annular inner cavity 310 into the air supply inner cavity 510 through the air supply hole 340 and the first opening 520 .

[0102] If the spline teeth of the second matching sleeve 300 and the spline grooves of the second matching ring 500 are complete, the spline teeth of the second matching sleeve 300 and the spline grooves of the second matching ring 500 are fully fitted, the air supply hole 340 and the first opening 520 can be smoothly connected, and the second opening 530 can also be smoothly blocked. In this case, as the drive ring 320 moves, the air pressure in the air supply cavity 510 will continue to increase, and the air pressure value corresponds to the movement distance of the drive ring 320 (the displacement of the positioning rod 330).

[0103] If the air pressure value in the air supply cavity 510 corresponds to the movement amount of the drive ring 320, it means that the spline teeth of the second mating sleeve 300 and the spline grooves of the second mating ring 500 are fully fitted, that is, the spline teeth of the second mating sleeve 300 and the spline grooves of the second mating ring 500 are complete.

[0104] If the air pressure value in the air supply cavity 510 does not correspond to the movement distance of the drive ring 320, usually the actual air pressure value in the air supply cavity 510 is smaller than the air pressure value corresponding to the current movement distance of the drive ring 320, which means that air leakage has occurred at the first opening 520 and / or the second opening 530. Since the second mating ring 500 does not participate in the braking transmission, the second mating ring 500 is usually intact, which means that the spline teeth of the second mating sleeve 300 are likely to be defective.

[0105] In other words, the processor can determine whether the mating surface of the second mating sleeve 300 used to mate with the second mating ring 500 is defective based on the actual rotation amount of the motor body 100 (or the displacement amount of the positioning rod 330), the detection data of the temperature sensor, and the detection data of the air pressure sensor, that is, to determine whether the spline teeth of the second mating sleeve 300 are defective. In this way, the structural integrity of the second mating sleeve 300 of the high-safety wire-controlled brake motor can be detected to ensure braking reliability.

[0106] Optionally, an air pressure balance hole 350 is opened on the inner wall of one end of the annular inner cavity 310 close to the first matching sleeve 200 , and the air pressure balance hole 350 extends to an end surface of one end of the second matching sleeve 300 close to the first matching sleeve 200 .

[0107] In this embodiment, the air delivery cavity 510 is annular and is coaxially arranged with the second matching ring 500. The groove sidewalls 730 on both sides of each spline groove are provided with second openings 530, which in turn ensure the comprehensiveness of the detection of the spline teeth of the second matching sleeve 300.

[0108] Further, please combine Fig.11 and Fig.12 An arc-shaped member 540 is disposed in the air supply cavity 510 , and the arc-shaped member 540 is slidably fitted in the air supply cavity 510 with damping and is slidably sealed with the inner wall of the air supply cavity 510 .

[0109] The central angle corresponding to the arc-shaped member 540 is greater than the central angle corresponding to the at least two spline grooves of the second mating ring 500 , so that the arc-shaped member 540 closes the second openings 530 of the at least two spline grooves of the second mating ring 500 at the same time.

[0110] There are two arc-shaped members 540 , which are spaced apart and disposed on both sides of the first opening 520 .

[0111] The sliding damping of the arc-shaped member 540 is set as follows: when the driving ring 320 pushes the gas into the gas delivery cavity 510, when the air pressure on the side of the arc-shaped member 540 close to the first opening 520 reaches the air pressure threshold, the arc-shaped member 540 is pushed.

[0112] The air pressure threshold can be flexibly adjusted and set according to actual needs.

[0113] When the driving ring 320 pushes the gas into the gas delivery cavity 510, the air pressure on the side of the arc-shaped member 540 close to the first opening 520 gradually increases. When the air pressure on the side of the arc-shaped member 540 close to the first opening 520 reaches the air pressure threshold, the arc-shaped member 540 is pushed, and both arc-shaped members 540 move away from the first opening 520, compressing the air in the area between the two arc-shaped members 540 (the area on the side of the two arc-shaped members 540 away from the first opening 520). Fig.12 As shown, until the air pressure is balanced with the air pressure on the side of the arc-shaped member 540 close to the first opening 520 .

[0114] Through this design, the arc-shaped member 540 can be used to perform a process similar to pressurization on the air in the air supply cavity 510. Due to the presence of the arc-shaped member 540 in the air supply cavity 510, when the drive ring 320 pushes a certain amount of gas into the air supply cavity 510, the air pressure rise amplitude on the side of the arc-shaped member 540 close to the first opening 520 will be significantly increased compared to when the arc-shaped member 540 is not provided. This facilitates improving the sensitivity of air pressure changes, thereby improving the detection sensitivity.

[0115] When the detection is completed, the driving ring 320 is reset, and the air pressure on the side of the arc-shaped member 540 close to the first opening 520 is gradually restored, and the two arc-shaped members 540 can be moved away from each other and reset again.

[0116] In particular, if there is a defect in the spline teeth of the second matching sleeve 300, the two arc-shaped members 540 may not be completely reset. During the maintenance process, the arc-shaped members 540 can be reset manually.

[0117] Optionally, a stopper 550 may be fixedly disposed in the air supply inner cavity 510, the outer diameter of the stopper 550 being smaller than the inner diameter of the air supply inner cavity 510, and a stopper 550 is disposed on a side of each arc-shaped member 540 close to the first opening 121. In the initial state (i.e., before the detection begins), both arc-shaped members 540 fit with the stopper 550. This design helps the two arc-shaped members 540 to accurately reset to the stopper 550 during the reset process.

[0118] Alternatively, the stop block 550 can be made of magnetic material, and the stop block 550 can use magnetic attraction to attract the arc member 540. At this time, the arc member 540 can no longer use a damped sliding fit, but use magnetic attraction to replace the additional damping force. With such a design, when the arc member 540 is reset, when the arc member 540 enters the magnetic force range of the stop block 550, the magnetic attraction of the stop block 550 can also be used to assist the arc member 540 to quickly reset, ensuring that the arc member 540 can be accurately reset. In addition, due to the existence of magnetic attraction, during the driving process of the vehicle, the stability of the arc member 540 can be effectively ensured, and the position of the arc member 540 can be prevented from being offset.

[0119] To sum up, the high-safety brake-by-wire motor provided by the embodiment of the present invention can realize self-inspection of rotational stroke accuracy according to actual needs, effectively reducing the probability of problems occurring in the brake-by-wire motor during the interval between two inspections, further improving the safety and reliability of the brake-by-wire motor, and contributing to further improving vehicle driving safety.

[0120] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-safety brake-by-wire motor, characterized in that: include: A motor body, a first matching sleeve, a second matching sleeve, a first matching ring, a position detection sensor and a processor; The first matching sleeve and the second matching sleeve are both sleeved on the power output shaft of the motor body, and the first matching sleeve is located on a side of the second matching sleeve close to the motor body; along the axial direction of the power output shaft, the first matching sleeve and the second matching sleeve are both slidably matched with the power output shaft and driven by a driver; along the circumferential direction of the power output shaft, the first matching sleeve and the second matching sleeve are both fixedly matched with the power output shaft; The first matching ring is sleeved on the second matching sleeve; along the axial direction of the second matching sleeve, the first matching ring and the second matching sleeve are slidably matched; along the circumferential direction of the second matching sleeve, the first matching ring and the second matching sleeve are fixedly matched; the first matching ring is used for transmission matching with the brake actuator of the wire control brake system; The second matching sleeve has an annular inner cavity, and the annular inner cavity is coaxially arranged with the second matching sleeve; an annular notch connected to the annular inner cavity is formed on an end wall of the second matching sleeve close to the first matching sleeve, and the annular notch is coaxially arranged with the second matching sleeve; A control ring is coaxially fixedly connected to an end wall of the first matching sleeve close to one end of the first matching sleeve, and the control ring is rotatably matched with the annular notch; a driving ring is also arranged in the annular inner cavity; along the axial direction of the second matching sleeve, the driving ring is slidably matched with the annular inner cavity; along the circumferential direction of the second matching sleeve, the driving ring is fixedly matched with the annular inner cavity; the control ring is threadedly matched with the driving ring; One end of the driving ring away from the first matching sleeve is fixedly connected to a positioning rod, and the positioning rod extends along the axial direction of the second matching sleeve and extends outside the second matching sleeve; The position detection sensor is used to detect the displacement of the positioning rod, and the position detection sensor is electrically connected to the processor; Along the axial direction of the power output shaft, the first matching sleeve and the second matching sleeve both have a first matching point and a second matching point; when the first matching sleeve and the second matching sleeve are located at the first matching point, both the first matching sleeve and the second matching sleeve are in transmission cooperation with the power output shaft, and the second matching sleeve is in transmission cooperation with the first matching ring, and the high-safety wire-controlled brake motor is in a working state; when the first matching sleeve and the second matching sleeve are located at the second matching point, the second matching sleeve is separated from the power output shaft, and the second matching sleeve is in transmission cooperation with the first matching ring, and the high-safety wire-controlled brake motor is in a self-checking state; The processor is used to determine whether the rotation stroke control of the motor body is accurate according to the corresponding relationship between the rotation amount of the motor body and the displacement amount of the positioning rod in the self-check state.

2. The high-safety brake-by-wire motor according to claim 1, characterized in that: The high-safety brake-by-wire motor further includes: a second mating ring; The second matching ring is coaxially arranged with the first matching ring and is located on a side of the first matching ring away from the motor body; the second matching ring is used to match with the second matching sleeve; When in the working state, the second matching sleeve is separated from the second matching ring; when in the self-test state, the second matching sleeve is matched with the second matching ring; Wherein, the second mating ring is constructed as follows: when the high-safety brake-by-wire motor is in the working state and the motor body is in the initial state, the mating parts between the second mating sleeve and the second mating ring are aligned, so that when the driver drives the first mating sleeve and the second mating sleeve to the second mating point, the second mating sleeve can smoothly mating with the second mating ring.

3. The high-safety brake-by-wire motor according to claim 2, characterized in that: The position detection sensor comprises: a magnetostrictive displacement sensor; The waveguide rod of the magnetostrictive displacement sensor is coaxially arranged with the second matching ring and extends into the second matching ring; a stopper is provided at the end of the waveguide rod for preventing the magnetic ring of the magnetostrictive displacement sensor from falling out; the magnetic ring is matched with an elastic member for pushing the magnetic ring to the side where the stopper is located; the outer diameter of the magnetic ring is smaller than the inner diameter of the second matching ring, and the outer diameter of the stopper is smaller than the inner diameter of the second matching sleeve; When the high-safety wire-controlled brake motor is in the self-test state, the second mating sleeve pushes the magnetic ring to the side away from the stop member; the processor is used to judge whether the second mating sleeve has moved into place according to the displacement of the magnetic ring pushed by the second mating sleeve, and to judge whether the rotation stroke control of the motor body is accurate according to the correspondence between the displacement of the magnetic ring pushed by the positioning rod and the rotation amount of the motor body.

4. The high-safety brake-by-wire motor according to claim 2, characterized in that: The end surfaces of the first matching sleeve and the second matching sleeve are spaced apart.

5. The high-safety brake-by-wire motor according to claim 2, characterized in that: The control ring is rotatably sealed with the annular notch, the control ring is attached to and rotatably sealed with the inner wall of one side of the annular inner cavity, the drive ring is rotatably sealed with the control ring, the drive ring is attached to and slidably sealed with the inner wall of the other side of the annular inner cavity, and the positioning rod is slidably sealed with the second matching sleeve; The annular inner cavity is also provided with an air supply hole, and the air supply hole extends from the annular inner cavity to the outer wall of the second matching sleeve; The second matching ring has an air supply inner cavity, and the inner ring wall of the second matching ring is provided with a first opening and a second opening connected to the air supply inner cavity; the first opening is used to connect to the air supply hole, and the second opening is distributed on the matching surface of the second matching ring for matching with the second matching sleeve; A temperature sensor and an air pressure sensor are provided in the air supply inner cavity, and both the temperature sensor and the air pressure sensor are electrically connected to the processor; When the high-safety brake-by-wire motor is in the self-test state, the air supply hole is connected to the first opening, and when the motor body rotates, the drive ring can push the gas in the annular inner cavity into the air supply inner cavity through the air supply hole and the first opening, and the processor is used to determine whether there is a defect in the mating surface of the second mating sleeve used to cooperate with the second mating ring based on the rotation amount of the motor body, the detection data of the temperature sensor and the detection data of the air pressure sensor.

6. The high-safety brake-by-wire motor according to claim 5, characterized in that: The first matching ring and the second matching ring are both matched with the second matching sleeve through a spline structure; the outer wall of the second matching sleeve is provided with spline teeth, and the inner ring walls of the first matching ring and the second matching ring are both provided with spline grooves; The tooth top surface of the spline teeth on the outer wall of the second mating sleeve is a plane and fits with the groove bottom of the spline groove on the inner ring wall of the second mating ring; the air supply hole is opened on the tooth top surface of the spline teeth of the second mating sleeve, the first opening is opened on the groove bottom of the spline groove of the second mating ring, and the second opening is opened on the groove side wall of the spline groove of the second mating ring.

7. The high-safety brake-by-wire motor according to claim 5, characterized in that: Both the first matching sleeve and the second matching sleeve are matched with the power output shaft through a spline structure.

8. The high-safety brake-by-wire motor according to claim 5, characterized in that: An air pressure balance hole is formed on the inner wall of one end of the annular inner cavity close to the first matching sleeve, and the air pressure balance hole extends to an end surface of one end of the second matching sleeve close to the first matching sleeve.

9. The high-safety brake-by-wire motor according to claim 6, characterized in that: The air supply inner cavity is annular and is coaxially arranged with the second matching ring; the second opening is provided on both side groove side walls of each of the spline grooves.

10. The high-safety brake-by-wire motor according to claim 9, characterized in that: An arc-shaped member is arranged in the air delivery cavity, and the arc-shaped member is slidably fitted in the air delivery cavity with damping and is slidably sealed with the inner wall of the air delivery cavity; The central angle corresponding to the arc-shaped member is greater than the central angle corresponding to the at least two spline grooves of the second matching ring, so that the arc-shaped member closes the second openings of the at least two spline grooves of the second matching ring at the same time; There are two arc-shaped members, which are spaced apart and disposed on both sides of the first opening; The sliding damping of the arc-shaped member is set as follows: when the driving ring pushes the gas into the gas delivery cavity, the arc-shaped member is pushed when the gas pressure on the side of the arc-shaped member close to the first opening reaches a gas pressure threshold.

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