Electromechanical brake apparatus provided with embedded speed reducer, system, and vehicle

Abstract

The present application provides an electromechanical brake apparatus provided with an embedded speed reducer and a vehicle. The electromechanical brake apparatus comprises a housing, a brake motor, a coaxial speed reducer, and a brake caliper; the brake motor is used for driving, by means of the coaxial speed reducer, the brake caliper to drive a friction plate; the housing is used for accommodating a stator and a rotor of the brake motor and a planetary gear set of the coaxial speed reducer; the rotor is used for being in transmission connection with the planetary gear set; the stator, the rotor, and an output shaft are coaxially arranged; and the planetary gear set is at least partially embedded in a center hole of the stator or the rotor. According to the electromechanical brake apparatus of the present application, by at least partially embedding the planetary gear set in the center hole of the stator or the rotor, the axial dimension of the electromechanical brake apparatus is reduced, and miniaturization is achieved.

Description

Electromechanical brake device, system and vehicle with built-in retarder

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on November 22, 2023, with application number 202311575755.X, and priority to the Chinese patent application entitled “Electronic mechanical braking device, system and vehicle with built-in reducer”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of vehicles, and in particular to an electromechanical braking device with a built-in retarder, an electromechanical braking system, and a vehicle. Background Art

[0003] Electromechanical brakes (EMBs) utilize a motor and mechanical transmission mechanism to actuate the brakes. They offer a simple structure, responsiveness, smooth load transfer, and the absence of hydraulic piping, resulting in high transmission efficiency. Furthermore, EMBs are trending towards miniaturization to accommodate wheel space. Summary of the Invention

[0004] This application provides an electromechanical brake device with an embedded speed reducer, an electromechanical brake system, and a vehicle. By embedding at least a portion of the planetary gear set of the electromechanical brake device within the center hole of the stator or rotor, the axial dimensions of the electromechanical brake device are reduced and miniaturization is achieved. This application specifically includes the following technical solutions:

[0005] In a first aspect, the present application provides an electromechanical brake device, which includes a housing, a brake motor, a coaxial reducer, and a brake caliper. The brake motor is used to drive the brake caliper to drive the friction plate through the coaxial reducer, wherein:

[0006] The housing is used to accommodate the stator, rotor and planetary gear set of the brake motor and the coaxial reducer, and the rotor is used to transmit and connect the planetary gear set;

[0007] The stator, the rotor and the output shaft are coaxially arranged, and the planetary gear set is at least partially embedded in the center hole of the stator or the rotor.

[0008] The electronic mechanical brake device of this application utilizes a brake motor to drive a coaxial reducer, which in turn drives the brake caliper to achieve braking. Along the axial direction of the brake motor, the planetary gear set of the coaxial reducer is arranged adjacent to the brake caliper. Along the radial direction of the brake motor, the stator and rotor of the brake motor are sleeved outside the planetary gear set. The electronic mechanical brake device of this application embeds at least a portion of the planetary gear set within the center hole of the stator or rotor, reducing the size of the electronic mechanical brake device along the axial direction of the brake motor. While ensuring reliable braking, the overall size of the electronic mechanical brake device is reduced, achieving miniaturization.

[0009] In one implementation, the brake motor includes a connecting ring, and the connecting ring, the planetary gear set and the brake caliper are arranged in sequence along the axial direction of the brake motor. The outer ring of the connecting ring is coaxially fixed with the rotor, and the inner ring of the connecting ring is used to coaxially drive the sun gear of the planetary gear set.

[0010] In this implementation, a connecting ring is located on the side of the planetary gear set away from the brake caliper. It is radially connected to the rotor of the brake motor and the sun gear of the planetary gear set. This allows the brake motor to transmit power to the planetary gear set through the connecting ring. This input to the planetary gear set is away from the brake caliper, which also facilitates power output from the planetary gear set toward the brake caliper.

[0011] In one implementation, the input shaft of the coaxial reducer is used to drive and connect the inner ring of the connecting ring and the sun gear.

[0012] In one implementation, the housing includes a support cylinder, which is coaxially arranged with the stator, rotor and planetary gear set. The inner circumference of the support cylinder is used to fix the ring gear of the planetary gear set, and the ring gear is used to support multiple planetary gears of the planetary gear set.

[0013] In this implementation, the housing includes a support tube extending axially along the brake motor, which extends into the gap between the rotor of the brake motor and the planetary gear set, and is used to at least fix the ring gear of the planetary gear set to ensure reliable transmission between the planetary gear and the sun gear of the planetary gear set.

[0014] In one implementation, the inner circumference of the housing is used to fix the outer circumference of the stator, and the central hole of the stator is used to accommodate the rotor; or,

[0015] The outer circumference of the support cylinder is used to fix the inner circumference of the stator, and the central hole of the rotor is used to accommodate the stator.

[0016] In this implementation, the brake motor can be an inner rotor motor, the stator of which is fixed to the inner circumference of the housing; or it can be an outer rotor motor, the rotor of which is fixed to the outer circumference of the support tube.

[0017] In one implementation, the planetary gear set includes at least two stages of planetary gear trains, which are arranged at intervals along the axial direction of the brake motor. The inner circumference of the support cylinder is used to fix at least two gear rings, and the at least two gear rings belong to different stages of the planetary gear trains.

[0018] In this implementation, a multi-stage planetary gear train is provided in the planetary gear set, which enables the coaxial reducer to achieve a larger reduction ratio. The gear rings in the multi-stage planetary gear train can be fixed to the inner circumference of the support cylinder at intervals.

[0019] In one implementation, the rotor of the brake motor includes a rotor support and a plurality of magnetic sheets. The rotor support is cylindrical. The plurality of magnetic sheets are evenly surrounded by and fixed to the circumferential surface of the rotor support facing the stator of the brake motor.

[0020] In this implementation, the rotor of the brake motor adopts a structure in which a magnetic sheet is attached to the surface of the rotor bracket, which can control the radial size of the rotor and facilitate the embedding of the planetary gear set in the center hole of the rotor or stator.

[0021] In one implementation, the electromechanical brake device includes a circuit board, the circuit board is used to fix a drive circuit, and the drive circuit is used to drive a brake motor, wherein:

[0022] Along the axial direction of the brake motor, the circuit board, the planetary gear set of the coaxial reducer and the brake caliper are arranged in sequence, and the circuit board and the brake caliper are located on opposite sides of the planetary gear set.

[0023] In this embodiment, an integrated circuit board can also be integrated into the electromechanical brake device, and the circuit board is arranged on the side of the planetary gear set away from the caliper. The circuit board is relatively close to the brake motor, which is beneficial for the wiring arrangement in the electromechanical brake device.

[0024] In one implementation, the plane direction of the circuit board is perpendicular to the axial direction of the brake motor.

[0025] In one implementation, the electromechanical brake device includes a position sensor, which is used to detect the rotation angle of the brake motor. The position sensor includes a stator and a rotor, wherein:

[0026] The circuit board is used to fix the stator of the position sensor;

[0027] The input shaft of the coaxial reducer is used to coaxially drive the rotor of the position sensor.

[0028] In this implementation, the electronic mechanical brake device detects the rotation angle of the brake motor through a position sensor, and then controls the thrust of the friction plate driven by the electronic mechanical brake device to achieve control of the vehicle's braking force.

[0029] In one implementation, the stator of the position sensor is provided with an inner hole, the axis of the inner hole of the stator of the position sensor coincides with the axis of the brake motor, the input shaft of the coaxial reducer extends toward the circuit board, and the inner hole of the stator of the position sensor is used to at least partially accommodate the rotor of the position sensor.

[0030] In this implementation, an extension section is provided on one side of the input shaft of the coaxial reducer to fix the rotor of the position sensor, so as to simplify the internal structure of the electromechanical brake device and make the internal space of the electromechanical brake device more compact.

[0031] In one implementation, the electromechanical brake device includes a locking mechanism, which is used to lock or release the input shaft of the coaxial reducer, wherein:

[0032] The locking mechanism is coaxially arranged with the input shaft, and is used to lock or release the outer peripheral surface of the input shaft of the coaxial reducer; or,

[0033] The locking mechanism is arranged along the axial direction of the brake motor on a side of the input shaft away from the brake caliper, and the locking mechanism is used to lock or release the end of the input shaft.

[0034] In this implementation, the locking mechanism cooperates with the input shaft to lock or release the transmission function of the coaxial reducer. In the transmission state, the coaxial reducer can be used to implement the braking function of the electromechanical brake; in the locked state, the coaxial reducer can be used to implement the parking function of the electromechanical brake.

[0035] In one implementation, the locking mechanism includes a sleeve, an electromagnetic coil and an axial displacement member. The sleeve is used to fix the outer peripheral surface of the input shaft, the electromagnetic coil is sleeved outside the sleeve, the circuit board is used to fix the control circuit of the electromagnetic coil, the control circuit is used to control the conduction or disconnection of the electromagnetic coil, and the electromagnetic coil is used to drive the axial displacement member to slide toward or away from the sleeve to lock or release the input shaft.

[0036] In this implementation, the locking mechanism is coaxially sleeved with the input shaft, and the locking mechanism controls the transmission function of the planetary gear set via a sleeve fixedly connected to the input shaft.

[0037] In one implementation, the locking mechanism includes a clutch and a locking motor, the circuit board is used to fix the control circuit of the locking motor, the control circuit of the locking motor is used to output AC power to drive the locking motor, and the locking motor is used to control the clutch to lock or release the end of the input shaft.

[0038] In this implementation, the locking mechanism is fixed to the housing or the circuit board and is provided corresponding to the end of the input shaft. The locking mechanism controls the transmission function of the planetary gear set by locking or releasing the end of the input shaft.

[0039] In one implementation, the brake caliper includes a lead screw, a sleeve and a caliper. The lead screw is coaxially driven with the output shaft of the coaxial reducer. The sleeve is arranged on the outside of the lead screw. The caliper is located on the side of the sleeve away from the brake motor along the axial direction of the output shaft. The lead screw rotates with the output shaft to drive the sleeve to slide along the axial direction of the output shaft. The sleeve is used to drive the caliper to slide and drive the friction plate.

[0040] In this implementation, the screw and the sleeve cooperate to convert the rotational motion output by the output shaft of the coaxial reducer into linear motion. The sleeve pushes the caliper and drives the friction plate to achieve braking.

[0041] In a second aspect, the present application provides an electronic mechanical braking system, comprising at least one friction plate and an electronic mechanical braking device provided by any of the above-mentioned implementations, the electronic mechanical braking device being used to drive at least one friction plate to move axially along a brake motor to brake a wheel.

[0042] In a third aspect, the present application provides a vehicle comprising wheels and the electronic mechanical braking system provided in the second aspect above, wherein the axis of the brake motor in the electronic mechanical braking system is parallel to the axis of the wheel, and the friction plate in the electronic mechanical braking system is used to move toward the brake disc of the wheel to brake the vehicle.

[0043] The electronic mechanical braking system provided in the second aspect of the present application and the vehicle provided in the third aspect adopt the above-mentioned electronic mechanical braking device. Under the premise of achieving reliable braking, the volume is controlled and can be adapted to the wheel side space. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0045] FIG1 is a schematic diagram of the appearance structure of a vehicle at the wheel provided in an embodiment of the present application;

[0046] FIG2 is a schematic diagram of a cross-sectional structure of a vehicle at a wheel provided in an embodiment of the present application;

[0047] FIG3 is a schematic cross-sectional view of an electromechanical braking device according to an embodiment of the present application;

[0048] FIG4 is a schematic cross-sectional view of a brake caliper in an electromechanical brake device according to an embodiment of the present application;

[0049] FIG5 is a schematic diagram of a cross-sectional structure inside a housing of an electronic mechanical brake device provided in an embodiment of the present application;

[0050] FIG6 is a schematic diagram of the appearance structure of a housing in an electronic mechanical braking device provided in an embodiment of the present application;

[0051] FIG7 is a schematic structural diagram of a disassembled housing and internal components of an electronic mechanical brake device provided in an embodiment of the present application;

[0052] FIG8 is a simplified structural diagram of a housing and its internal components in an electronic mechanical brake device provided in an embodiment of the present application;

[0053] FIG9 is a schematic cross-sectional view of a brake motor in an electronic mechanical brake device provided in an embodiment of the present application;

[0054] FIG10 is a schematic diagram of the exploded structure of a brake motor in an electromechanical brake device provided in an embodiment of the present application;

[0055] FIG11 is a schematic diagram of the exploded structure of a rotor of a brake motor in an electromechanical brake device provided in an embodiment of the present application;

[0056] FIG12 is a schematic cross-sectional view of the structure of the support cylinder and the planetary gear in an electronic mechanical brake device provided in an embodiment of the present application;

[0057] FIG13 is a schematic diagram of the exploded structure of a support cylinder and a planetary gear in an electronic mechanical brake device provided in an embodiment of the present application;

[0058] FIG14 is a simplified structural diagram of another embodiment of a housing and internal components of an electronic mechanical braking device provided in an embodiment of the present application;

[0059] FIG15 is a simplified structural diagram of another embodiment of a housing and internal components of an electronic mechanical braking device provided in an embodiment of the present application;

[0060] FIG16 is a simplified structural diagram of another embodiment of a housing and internal components of an electromechanical brake device provided in an embodiment of the present application;

[0061] FIG17 is a schematic diagram of the exploded structure of a locking mechanism in an electromechanical brake device according to an embodiment of the present application;

[0062] FIG18 is a simplified structural diagram of another embodiment of a housing and internal components of an electronic mechanical brake device provided in an embodiment of the present application;

[0063] FIG19 is a simplified structural diagram of another embodiment of a housing and internal components of an electromechanical brake device provided in an embodiment of the present application;

[0064] FIG20 is a schematic cross-sectional view of another embodiment of a locking mechanism in an electronic mechanical brake device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection claimed in this application.

[0066] The present application provides an electronic mechanical brake device, comprising a housing, a brake motor, a coaxial reducer, and a brake caliper. The brake motor is used to drive the brake caliper to drive the friction plate via the coaxial reducer. The housing is used to accommodate the stator and rotor of the brake motor and the planetary gear set of the coaxial reducer, and the rotor is used to drive the planetary gear set. The stator, rotor, and output shaft are arranged coaxially, and the planetary gear set is at least partially embedded in the center hole of the stator or rotor. The electronic mechanical brake device of the present application embeds at least partially the planetary gear set in the center hole of the stator or rotor, thereby reducing the size of the electronic mechanical brake device along the axial direction of the brake motor. While ensuring reliable braking of the electronic mechanical brake device, the overall volume of the electronic mechanical brake device is reduced, achieving miniaturization.

[0067] This application provides an electromechanical braking system comprising at least one friction plate and the aforementioned electromechanical braking device. The electromechanical braking device is configured to drive the at least one friction plate to move axially along a brake motor to brake a wheel. The electromechanical braking system is compact and can fit comfortably around a wheel.

[0068] The present application provides a vehicle comprising wheels and the aforementioned electromechanical braking system. The axial direction of the brake motor in the electromechanical braking system is parallel to the axial direction of the wheel, and the friction pads in the electromechanical braking system are configured to move toward the brake discs of the wheels to brake the vehicle. The electromechanical braking system of the vehicle in the present application is relatively compact, facilitating the layout of the vehicle's interior space.

[0069] The vehicle of the present application includes wheels and a frame, wherein the wheels are rotatably connected to the frame to drive the vehicle. The electronic mechanical braking system of the present application is fixed to the frame and located at the wheels, and the electronic mechanical braking system brakes the wheels through the action of an internal mechanism.

[0070] Please refer to FIG1 for a schematic diagram of the appearance structure of the vehicle wheel provided in an embodiment of the present application.

[0071] As shown in Figure 1 , wheel 1001 is equipped with a brake disc 1002, which is coaxially fixed to the hub of wheel 1001. As wheel 1001 rotates relative to the vehicle frame, brake disc 1002 rotates synchronously with wheel 1001 relative to the vehicle frame. In the diagram of Figure 1 , the outer diameter of brake disc 1002 is smaller than the inner diameter of the inner rim of the wheel, and brake disc 1002 is accommodated within the inner rim of wheel 1001.

[0072] The electronic mechanical braking system 200 provided in the present application is fixed to a vehicle frame (not shown). The electronic mechanical braking system 200 at least partially extends into the inner ring of the wheel 1001 and cooperates with the brake disc 1002 to brake the wheel 1001 .

[0073] Please refer to FIG2 for a schematic cross-sectional structure diagram of a vehicle wheel provided in an embodiment of the present application.

[0074] As shown in Figure 2, the electronic mechanical brake system 200 of the present application includes a caliper frame 201, a friction plate 202, and the electronic mechanical brake device 100 provided in the present application. The caliper frame 201 is fixedly connected to the vehicle frame, and the electronic mechanical brake device 100 is slidably connected to the caliper frame 201. In some embodiments, the electronic mechanical brake device 100 and the caliper frame 201 are slidably connected via a through hole and a sliding rod. That is, the electronic mechanical brake device 100 is provided with one of the through hole and the sliding rod, and the caliper frame 201 is provided with the other of the through hole and the sliding rod. The relative sliding between the electronic mechanical brake device 100 and the caliper frame 201 is achieved by the axial sliding of the sliding rod in the through hole.

[0075] It should be noted that the sliding direction of the electromechanical brake device 100 relative to the caliper frame 201 is parallel to the axial direction of the brake disc 1002. Corresponding to the above-mentioned embodiment of the through hole and the slide rod, the axial direction of the through hole and the axis of the slide rod are both parallel to the axial direction of the brake disc 1002.

[0076] There are two friction plates 202, arranged axially on either side of the brake disc 1002. The two friction plates 202 face opposite outer surfaces of the brake disc 1002. The electromechanical brake device 100, through internal mechanism operation and sliding relative to the caliper frame 201, pushes the two friction plates 202 toward each other and into contact with the opposite outer surfaces of the brake disc 1002, generating friction to brake the disc 1002.

[0077] Please refer to FIG. 3 , which shows a schematic cross-sectional structure of an electronic mechanical braking device 100 according to an embodiment of the present application.

[0078] As shown in FIG3 , the electronic mechanical brake device 100 of the present application includes a brake caliper 10, a housing 20, a brake motor 30, and a coaxial reducer 40. The brake caliper 10 is used to slideably connect to the caliper frame 201 and slide axially relative to the caliper frame 201 along the brake disc 1002. The housing 20 is fixedly connected to the brake caliper 10, and the inner cavity of the housing 20 is used to accommodate the brake motor 30 and the coaxial reducer 40. The coaxial reducer 40 is used to transmit and connect the brake caliper 10 and the brake motor 30, and the brake motor 30 is used to drive the coaxial reducer 40 to rotate, thereby driving the brake caliper 10 to push the friction plate 202.

[0079] Please refer to FIG. 4 , which shows a schematic cross-sectional structure of a brake caliper 10 in an electronic mechanical brake device 100 according to an embodiment of the present application.

[0080] The brake caliper 10 includes a caliper 11 and a feed mechanism. The caliper 11 is generally U-shaped and comprises a main body 111, a pusher 112, and a connecting portion 113. The main body 111 and the pusher 112 are arranged axially on either side of the brake disc 1002. Furthermore, the main body 111 and the pusher 112 are arranged axially on either side of the two friction plates 202 of the brake disc 1002. In other words, the pusher 112, one friction plate 202, the brake disc 1002, the other friction plate 202, and the main body 111 are arranged in sequence axially of the brake disc 1002. The connecting portion 113 is located radially outside the brake disc 1002 and is used to securely connect the main body 111 and the pusher 112.

[0081] In one embodiment, the friction plate 202 located on the side of the brake disc 1002 close to the main body 111 is slidably connected to the main body 111. In one embodiment, the friction plate 202 located on the side of the brake disc 1002 close to the pushing portion 112 is fixedly connected to the pushing portion 112.

[0082] The main body 111 is also used for sliding connection to the caliper frame 201. The feeding mechanism is accommodated in the inner cavity of the main body 111. The shell 20 is fixed to the side of the main body 111 away from the pushing portion 112. The feeding mechanism is connected to the coaxial reducer 40 in a transmission manner. The main body 111 and the shell 20 are respectively provided with avoidance holes, and the avoidance holes are used to avoid the transmission shaft between the feeding mechanism and the coaxial reducer 40. In some embodiments, the transmission shaft can be an integral structure with the input shaft of the feeding mechanism, that is, the input shaft of the feeding mechanism can pass through the two avoidance holes and extend into the shell 20 to be transmission-connected to the coaxial reducer 40; in other embodiments, the transmission shaft can be an integral structure with the output shaft of the coaxial reducer 40, that is, the output shaft of the coaxial reducer 40 can pass through the two avoidance holes and extend into the inner cavity of the main body 111 to be transmission-connected to the feeding mechanism.

[0083] The feed mechanism includes a lead screw 12 and a threaded sleeve 13. The threaded sleeve 13 is coaxially sleeved on the outside of the lead screw 12, and the lead screw 12 is used to coaxially transmit the output shaft of the coaxial reducer 40. The output shaft of the coaxial reducer 40 drives the lead screw 12 to rotate, thereby driving the threaded sleeve 13 to slide. At this time, the end of the lead screw 12 facing the coaxial reducer 40 can be regarded as the input shaft of the feed mechanism.

[0084] Specifically, the outer circumference of the lead screw 12 and the inner circumference of the threaded sleeve 13 are provided with mating threads. When the lead screw 12 is driven by the coaxial reducer 40 to rotate along its own axis, the lead screw 12 can drive the threaded sleeve 13 to slide along the axis of the lead screw 12. On the side of the threaded sleeve 13 away from the coaxial reducer 40, the threaded sleeve 13, a friction plate 202, and the brake disc 1002 are arranged in sequence along the axis of the lead screw 12. By driving the threaded sleeve 13 to slide along the axis of the lead screw 12, the lead screw 12 can drive the friction plate 202 to move relative to the brake disc 1002.

[0085] It can be understood that when the brake motor 30 rotates forward, the coaxial reducer 40 drives the screw 12 to rotate forward along its own axis, and the screw sleeve 13 slides along the axis of the screw 12 toward the brake disc 1002, and drives the friction plate 202 to contact the brake disc 1002 to achieve braking; when the brake motor 30 flips over, the coaxial reducer 40 drives the screw 12 to reverse along its own axis, and the screw sleeve 13 slides along the axis of the screw 12 toward the direction away from the brake disc 1002, and the friction plate 202 and the brake disc 1002 are released.

[0086] In some embodiments, a separation spring 203 is further provided between the two friction plates 202, and the opposite ends of the separation spring 203 respectively abut against the two friction plates 202. The separation spring 203 is used to provide an elastic force for the two friction plates 202 to move away from each other along the axial direction of the screw 12, so as to ensure that after the screw sleeve 13 slides away from the brake disc 1002, the two friction plates 202 respectively release contact with the brake disc 1002.

[0087] In some embodiments, balls (not shown) may be disposed between the lead screw 12 and the screw sleeve 13. Multiple balls may be provided, and the balls are positioned between the outer threads of the lead screw 12 and the inner threads of the screw sleeve 13. The balls serve to reduce friction between the lead screw 12 and the screw sleeve 13, thereby improving the transmission efficiency of the electronic mechanical brake device 100.

[0088] Please refer to FIG. 5 for a schematic cross-sectional view of the interior of the housing 20 of the electronic mechanical brake device 100 provided in an embodiment of the present application.

[0089] As shown in Figure 5, the brake motor 30 includes a stator 31 and a rotor 32. The stator 31 and rotor 32 are coaxially arranged along the radial direction of the brake motor 30. The stator 31 is used to drive the rotor 32 to rotate and output power. In some embodiments, the brake motor 30 may further include a motor shaft, which is coaxially fixed with the rotor 32 and is drivingly connected to a coaxial reducer 40. The brake motor 30 transmits power to the coaxial reducer 40 via the motor shaft.

[0090] In the embodiment shown in Figure 5, the brake motor 30 is an inner rotor motor, with the stator 31 coaxially sleeved outside the rotor 32, which is located within the center hole of the stator 31. In this case, the housing 20 is used to secure the stator 31, which drives the rotor 32 to rotate within the center hole of the stator 31. In other embodiments, the brake motor 30 can be an outer rotor motor, with the rotor 32 coaxially sleeved outside the stator 31, which is located within the center hole of the rotor 32. In this case, a support tube structure is provided within the housing 20, which serves to secure the stator 31, and the stator 31 drives the rotor 32 to rotate outside the stator 31.

[0091] The coaxial reducer 40 includes an input shaft 41, an output shaft 42, and a gear set. The input shaft 41 and the output shaft 42 are connected by a gear set. The input shaft 41 is connected to the brake motor 30, and the output shaft 42 is connected to the brake caliper 10. Specifically, the input shaft 41 of the coaxial reducer 40 is used to coaxially drive the rotor 32 of the brake motor 30. In some embodiments, the input shaft 41 is used to coaxially drive the motor shaft of the brake motor 30. The output shaft 42 of the coaxial reducer 40 is used to coaxially drive the screw 12 of the feed mechanism.

[0092] Gear sets are used to adjust the rotational speed. In the embodiment of the present application, the axis of the input shaft 41 of the coaxial reducer 40 coincides with the axis of the output shaft 42. The gear set can be implemented using a planetary gear set 43. The planetary gear set 43 has a relatively compact structure and can provide a large reduction ratio, which facilitates the miniaturization of the electronic mechanical brake device 100 of the present application. Furthermore, the input and output axes of the planetary gear set 43 coincide, making it suitable for use as a gear set transmission in the coaxial reducer 40 of the present application.

[0093] On the other hand, in the illustrated embodiment, the planet carrier of the planetary gear set 43 is coaxially driven with the lead screw 12, and the planet carrier of the planetary gear set 43 also serves as the output shaft 42 of the coaxial reducer 40. Alternatively, in the illustrated embodiment, the output shaft 42 of the coaxial reducer 40 and the planet carrier of the planetary gear set 43 are integrally formed. The integral structure of the planet carrier and output shaft 42 simplifies the structure of the coaxial reducer 40 and reduces its size. It is understood that in other embodiments, the coaxial reducer 40 may also be provided with a separate output shaft 42, which is used to drive the connection between the planet carrier of the planetary gear set 43 and the lead screw 12.

[0094] The following describes in detail the workflow of the electronic mechanical braking system 200 of the present application during the vehicle braking process:

[0095] When the vehicle needs to brake, the stator 31 of the brake motor 30 drives the rotor 32 to rotate forward. The rotor 32 drives the input shaft 41 of the coaxial reducer 40 connected to the transmission to rotate forward synchronously. The input shaft 41 drives the output shaft 42 to rotate forward through the gear set. The output shaft 42 drives the screw 12 in the feed mechanism connected to the transmission to rotate forward synchronously. The feed mechanism is used to convert the rotation of the screw 12 into a sliding motion of the screw sleeve 13, that is, the screw 12 drives the screw sleeve 13 to slide along the axis of the screw 12. The sliding direction of the screw sleeve 13 is towards the brake disc 1002. The screw sleeve 13 pushes a friction plate 202 to move towards the brake disc 1002, and causes the friction plate 202 to contact the brake disc 1002 to generate friction.

[0096] After the friction plate 202 near the screw sleeve 13 contacts and abuts the brake disc 1002, the stator 31 of the brake motor 30 continues to drive the rotor 32 in forward rotation. Through the same power transmission path described above, the screw sleeve 13 slides axially along the lead screw 12. Because the brake disc 1002 is fixed in position, the screw sleeve 13, the friction plate 202, and the brake disc 1002 abut each other in sequence. The screw sleeve 13 receives the opposing thrust from the brake disc 1002, and the axial sliding motion of the screw sleeve 13 relative to the lead screw 12 is converted into a sliding motion in which the screw sleeve 13 pushes the caliper 11 in the opposite direction relative to the caliper frame 201. In other words, after the friction plate 202 near the screw sleeve 13 contacts and abuts the brake disc 1002, the axial dimension of the feed mechanism further increases under the action of the brake motor 30, pushing the caliper 11 in the opposite direction relative to the caliper frame 201 toward the housing 20. The housing 20 slides synchronously with the caliper 11 in a direction away from the brake disc 1002.

[0097] The sliding movement of the caliper 11 toward the housing 20 drives the pusher 112 to simultaneously slide toward the housing 20. Because the pusher 112 is located on the side of the brake disc 1002 facing away from the housing 20, the pusher 112 slides toward the brake disc 1002. That is, after the friction plate 202 near the threaded sleeve 13 contacts and abuts the brake disc 1002, the feed mechanism further drives the pusher 112 to slide toward the brake disc 1002. The pusher 112 then drives the other friction plate 202 on the same side to simultaneously slide toward the brake disc 1002, causing it to contact and generate friction.

[0098] Thus, through the internal mechanism of the electronic mechanical brake device 100, the friction plates 202 located on both sides of the brake disc 1002 can be driven to slide toward each other and contact the two opposite outer surfaces of the brake disc 1002 respectively, generating friction to brake the brake disc 1002 and achieve vehicle braking.

[0099] After braking is complete, the stator of the brake motor 30 drives the rotor 32 in reverse rotation. The rotor 32, in turn, drives the input shaft 41 and output shaft 42 of the coaxial reducer 40, as well as the lead screw 12 of the feed mechanism, in synchronous reverse rotation. The reverse rotation of the lead screw 12 causes the threaded sleeve 13 to slide away from the brake disc 1002, thereby increasing the distance between the two friction plates 202. The release spring 203 releases the two friction plates 202 from the brake disc 1002, allowing the wheel 1001 to continue rotating and driving the vehicle.

[0100] In some embodiments, a return spring (not shown in the figure) can also be provided between the caliper 11 and the caliper frame 201. The return spring is used to drive the caliper 11 to slide relative to the caliper frame 201 in a direction away from the housing 20, so as to drive the pushing portion 112 to slide in a direction away from the brake disc 1002, thereby ensuring that the two friction plates 202 are reliably separated from the brake disc 1002.

[0101] Therefore, after braking is completed, the internal mechanism of the electronic mechanical brake device 100 can drive the friction plates 202 located on both sides of the brake disc 1002 to slide opposite to each other and release contact with the two opposite outer surfaces of the brake disc 1002, so that the wheel 1001 can continue to rotate and drive the vehicle to move.

[0102] In one embodiment, the electromechanical brake device 100 includes a circuit board 50. The circuit board 50 holds a drive circuit, which drives the brake motor 30. The circuit board 50 can be housed within the inner cavity of the housing 20 along with the brake motor 30. This shortens the signal transmission distance from the drive circuit to the brake motor 30 and simplifies the internal wiring layout of the electromechanical brake device 100. Furthermore, the housing 20 provides a reliable seal and protective protection for the circuit board 50.

[0103] In one embodiment, the electronic mechanical brake device 100 includes a position sensor. The position sensor is used to detect the rotation angle of the brake motor 30 and thereby adjust the braking force of the electronic mechanical brake device 100. The position sensor includes a stator and a rotor. The stator of the position sensor can be fixed to the housing 20, and the rotor of the position sensor can be coaxially driven with the motor shaft of the brake motor 30 or the drive shaft of the coaxial reducer 40. The stator of the position sensor can be directly fixed to the housing 20, or it can be fixed to the circuit board 50 and indirectly fixed to the housing 20 via the circuit board 50; the rotor of the position sensor can be coaxially driven with the motor shaft of the brake motor 30, the input shaft 41, and the output shaft 42 of the coaxial reducer 40.

[0104] The stator and rotor of the position sensor cooperate to detect the rotational angles of the motor shaft of the brake motor 30 and the input shaft 41 and output shaft 42 of the coaxial reducer 40 within the inner cavity of the housing 20. The position sensor is also communicatively connected to the drive circuit on the circuit board 50. The drive circuit receives the angle signal detected by the position sensor, calculates the rotational angle of the rotor 32 in the brake motor 30, and thereby adjusts the braking force of the electronic mechanical brake device 100, thereby adjusting the braking force of the vehicle.

[0105] In one embodiment, the electronic mechanical brake device 100 includes a locking mechanism. The locking mechanism is used to lock or release the motor shaft of the brake motor 30, or the locking mechanism is used to lock or release the drive shaft of the coaxial reducer 40, and enables the electronic mechanical brake device 100 of the present application to also have a parking function. Specifically, part of the locking mechanism is fixed to the housing 20, and the other part acts on the motor shaft of the brake motor 30 or the drive shaft of the coaxial reducer 40. When the friction plate 202 of the electronic mechanical brake system 200 is in contact with the brake disc 1002, the motor shaft of the brake motor 30 or the drive shaft of the coaxial reducer 40 can be locked by the locking mechanism to maintain the contact state of the friction plate 202 with the brake disc 1002, and the brake disc 1002 no longer rotates, and the vehicle enters the parking state.

[0106] Please refer to Figures 6 to 8. Figure 6 shows the exterior structure of the housing 20 in the electronic mechanical brake device 100 of the present application; Figure 7 shows the structure of the housing 20 after decomposition and its internal components; and Figure 8 shows a simplified structural diagram of the housing 20 and its internal components.

[0107] In the electronic mechanical brake device 100 of the present application, the housing 20 is used to accommodate the stator 31 and rotor 32 of the brake motor 30, as well as the planetary gear set 43 of the coaxial reducer 40. In the illustrated embodiment, the housing 20 also accommodates a circuit board 50 and a locking mechanism 60. The housing 20 includes a partition 21. The stator 31 and rotor 32 of the brake motor 30, as well as the planetary gear set 43 of the coaxial reducer 40, are located on one side of the partition 21, and the circuit board 50 is located on the other side of the partition 21. Because the circuit board 50 carries a drive circuit, and the brake motor 30 and the coaxial reducer 40 may each contain cooling oil or lubricating oil, the partition 21 is placed between the circuit board 50 and the brake motor 30 and the planetary gear set 43 to provide a sealed protection for the partition 21.

[0108] In the illustrated embodiment, the locking mechanism 60 and the circuit board 50 are located on the same side of the partition 21. In other embodiments, the locking mechanism 60 may also be located on the side of the partition 21 away from the circuit board 50. The position of the locking mechanism 60 can be matched based on its specific structure and spatial arrangement.

[0109] In the illustrated embodiment, the brake motor 30 is an inner rotor motor, i.e., the stator 31 is coaxially sleeved on the outside of the rotor 32, and the housing 20 is used to secure the stator 31. The rotor 32 includes a central hole, and the planetary gear set 43 of the electromechanical brake device 100 of the present application is at least partially embedded in the central hole of the rotor 32. In the illustrated embodiment, the planetary gear set 43 is entirely embedded in the central hole of the rotor 32.

[0110] As a result, in the electronic mechanical brake device 100 of the present application, the stator 31 and rotor 32 of the brake motor 30 are sleeved outside the planetary gear set 43 along the radial direction of the brake motor 30, forming a structure in which the coaxial reducer 40 is partially embedded in the brake motor 30. This structure reduces the size of the electronic mechanical brake device 100 along the axial direction of the brake motor 30, and while ensuring reliable braking, it also reduces the overall volume of the electronic mechanical brake device 100, achieving miniaturization.

[0111] It is understood that when the brake motor is an outer rotor motor, that is, the rotor 32 is coaxially sleeved outside the stator 31, the planetary gear set 43 can be at least partially embedded in the center hole of the stator 31, and the structure in which the coaxial reducer 40 is partially embedded in the brake motor 30 can also be formed. Under the premise of ensuring reliable braking of the electronic mechanical brake device 100, the overall volume of the electronic mechanical brake device 100 is compressed to achieve miniaturization.

[0112] Please refer to Figures 9 to 11. Figure 9 is a cross-sectional view of the brake motor 30 in the electronic mechanical brake device 100 of the present application; Figure 10 is an exploded view of the brake motor 30; and Figure 11 is an exploded view of the rotor 32 in the brake motor 30.

[0113] As shown in FIG9 , the brake motor 30 of the electronic mechanical brake device 100 of the present application includes a connecting ring 33, which is used to drively connect the rotor 32 of the brake motor 30 and the input shaft 41 of the coaxial reducer 40. Specifically, the outer ring of the connecting ring 33 is coaxially fixed with the rotor 32. In the illustrated embodiment, the connecting ring 33 and the rotor 32 are also integrally formed. The inner ring of the connecting ring 33 is used to coaxially drive the sun gear of the planetary gear set 43. In the illustrated embodiment, the inner ring of the connecting ring 33 is fixedly connected to the input shaft 41 of the coaxial reducer 40 and is drive-connected to the sun gear of the planetary gear set 43 via the input shaft 41. In other embodiments, the inner ring of the connecting ring 33 can be directly fixedly connected to the sun gear of the planetary gear set 43.

[0114] On the other hand, in the schematic diagrams of Figures 9 and 10, the connecting ring 33 is defined as being in transmission connection with the input shaft 41 of the coaxial reducer 40. Because the input shaft 41 of the coaxial reducer 40 is coaxially transmitted with the motor shaft of the brake motor 30, the input shaft 41 can also be defined as the motor shaft of the brake motor 30. Or it can be described as that the input shaft 41 of the coaxial reducer 40 and the motor shaft of the brake motor 30 are an integrated structure. At this time, the connecting ring 33 can also be understood as an inner ring fixed to the motor shaft of the brake motor 30, and the motor shaft of the brake motor 30 is coaxially transmitted with the planetary gear set 43. The division of the input shaft 41 does not affect the realization of the transmission function between the brake motor 30 and the coaxial reducer 40 of the present application.

[0115] In one embodiment, the connecting ring 33, the planetary gear set 43, and the brake caliper 10 are arranged in sequence along the axial direction of the brake motor 30. Specifically, the connecting ring 33 is located on the side of the planetary gear set 43 away from the brake caliper 10. Power is input from the planetary gear set 43 away from the brake caliper 10, facilitating power output from the planetary gear set 43 toward the brake caliper 10.

[0116] Referring to Figure 11 , in one embodiment, the rotor 32 of the brake motor 30 includes a rotor support 321 and a plurality of magnetic plates 322. The rotor support 321 is cylindrical, and the outer ring of the connecting ring 33 is fixed to the rotor support 321. Along the circumference of the rotor support 321, the plurality of magnetic plates 322 are evenly arranged around and fixed to the circumferential surface of the rotor support 321 facing the stator of the brake motor 30.

[0117] Specifically, in the schematic diagram of Figure 11, the rotor bracket 321 comprises two parts: one part forms the main body of the rotor bracket 321, and the other part is sleeved around the main body of the rotor bracket 321 and has multiple hollow areas. Each magnetic sheet 322 is embedded in each hollow area to secure it to the outer circumference of the rotor bracket 321. In other embodiments, the magnetic sheets 322 can also be directly attached to the outer circumference of the rotor bracket 321 using a surface mount method.

[0118] The windings in the form of magnetic sheets 322 are easy to manufacture, and by controlling the thickness of magnetic sheets 322 and the wall thickness of rotor bracket 321, the radial dimension of rotor 32 can be reduced, further reducing the radial dimension of brake motor 30 and miniaturizing electronic mechanical brake device 100. Furthermore, the reduced radial dimension of rotor 32 facilitates the embedding of planetary gear set 43 within the center hole of rotor 32 or stator 31.

[0119] It should be noted that in the schematic diagram of Figure 11 , the brake motor 30 is an inner rotor motor. In this case, the outer circumference of the rotor bracket 321 faces the stator 31, and the multiple magnetic sheets 322 are attached to the outer circumference of the rotor bracket 321. In contrast, if the brake motor 30 is an outer rotor motor, the inner circumference of the rotor bracket 321 faces the stator 31, and the multiple magnetic sheets 322 need to be attached to the inner circumference of the rotor bracket 321 to ensure reliable operation of the brake motor 30.

[0120] Please refer to Figures 5 and 7 . In one embodiment, the housing 20 includes a support tube 22. The support tube 22 is cylindrical and located within the inner cavity of the housing 20 and is fixedly connected to the main body of the housing 20. The axis of the support tube 22 coincides with the axis of the brake motor 30. Along the radial direction of the brake motor 30, the support tube 22 is located between the planetary gear set 43 and the rotor 32 of the brake motor 30, and the support tube 22 is used to accommodate the planetary gear set 43.

[0121] For details, please refer to Figures 12 and 13. Figure 12 is a schematic cross-sectional view of the support cylinder 22 and the planetary gear set 43, and Figure 13 is a schematic exploded view of the support cylinder 22 and the planetary gear set 43.

[0122] As shown in Figures 12 and 13, in one embodiment, the planetary gear set 43 includes a two-stage planetary gear train. The two-stage planetary gear train is axially spaced apart along the input shaft 41 of the coaxial reducer 40 and is drivingly connected to increase the reduction ratio of the planetary gear set 43. It is understood that in other embodiments, the planetary gear set 43 may be provided with only one stage of planetary gear train, or the planetary gear set 43 may be provided with three or more stages of planetary gear trains, depending on the reduction ratio requirements of the coaxial reducer 40.

[0123] Each stage of the planetary gear train includes a sun gear 431, planetary gears 432, a planet carrier 433, and a ring gear 434. Taking the planetary gear train near the input shaft 41 as an example, in this planetary gear train, the sun gear 431 is used to coaxially transmit the input shaft 41 of the coaxial reducer 40. There are multiple planetary gears 432, which are meshed with the outer circumference of the sun gear 431. One side of the planet carrier 433 is used to rotatably connect the planetary gears 432, and the other side of the planet carrier 433 is used to rotatably connect the sun gear 431 of the next stage of the planetary gear train.

[0124] It can be understood that the sun gear 431 of the next-stage planetary gear train is used to drive the planet carrier 433 of the next-stage planetary gear train to rotate through the planet gear 432 of the next-stage planetary gear train, and the planet carrier 433 of the next-stage planetary gear train is used to coaxially drive the screw 12 of the brake caliper 10.

[0125] In the illustrated embodiment, the sun gear 431 in the planetary gear train near the input shaft 41 is also an integral structure with the end of the input shaft 41, which can compress the overall volume of the planetary gear set 43; in the planetary gear train near the output shaft 42, the sun gear 431 is also an integral structure with the planetary carrier 433 in the planetary gear train near the input shaft 41, which can also compress the overall volume of the planetary gear set 43.

[0126] In the embodiment shown in Figures 12 and 13 , the inner circumference of the support cylinder 22 is used to secure the ring gear 434 of the planetary gear set 43. Ring gear 434 supports multiple planetary gears 432. In an embodiment where the planetary gear set 43 includes a two-stage planetary gear train, the support cylinder 22 secures the two ring gears 434, which belong to different stages of the planetary gear train. It will be appreciated that the two ring gears 434 are fixed at intervals along the axial direction of the support cylinder 22.

[0127] Thus, along the radial direction of the brake motor 30, the support cylinder 22 is coaxially arranged with the stator 31, rotor 32, and planetary gear set 43, with the support cylinder 22 positioned between the stator 31 and the planetary gear set 43. Alternatively, the support cylinder 22 extends into the gap between the rotor 32 of the brake motor 30 and the planetary gear set 43. The inner circumference of the support cylinder 22 is used to secure the ring gear 434 of the planetary gear set 43. The ring gear 434 is used to support the multiple planetary gears 432 of the planetary gear set 43, ensuring reliable transmission after the planetary gear set 43 is at least partially embedded in the center hole of the stator 31 of the brake motor 30.

[0128] Please refer to Figure 8 . In one embodiment, when the brake motor 30 is an inner rotor motor, the inner circumference of the housing 20 is used to fix the outer circumference of the stator 31, and the central hole of the stator 31 is used to accommodate the rotor 32. In this case, the rotor 32 can rotate relative to the outer circumference of the support tube 22, with a gap remaining between the rotor 32 and the outer circumference of the support tube 22.

[0129] In one embodiment, an inner rotor bearing 91 (as shown in FIG14 ) may be provided between the rotor 32 and the outer circumferential surface of the support tube 22. The inner ring of the inner rotor bearing 91 is fixed to the outer circumferential surface of the support tube 22, and the outer ring of the inner rotor bearing 91 is fixed to the inner circumferential surface of the rotor 32. The inner rotor bearing 91 is used to support the rotor 32 so that the rotor 32 rotates more smoothly relative to the support tube 22. In one embodiment, along the axial direction of the brake motor 30, the inner rotor bearing 91 is located on the side of the rotor 32 close to the brake caliper 10. At this time, the inner rotor bearing 91 and the connecting ring 33 are respectively located on opposite sides of the rotor 32. The inner rotor bearing 91 and the connecting ring 33 can respectively support the rotor 32 from both sides of the rotor 32, further improving the rotational stability of the rotor 32 and improving the transmission efficiency of the electronic mechanical brake device 100.

[0130] In another embodiment, when the brake motor 30 is an outer rotor motor, as shown in Figure 15 , the outer circumference of the support cylinder 22 also serves to secure the inner circumference of the stator 31, and the central hole of the rotor 32 is used to accommodate the stator 31. In this case, the rotor 32 can rotate relative to the inner circumference of the housing 20, with a gap remaining between the rotor 32 and the inner circumference of the housing 20.

[0131] In one embodiment, an outer rotor bearing 92 (as shown in FIG16 ) may be provided between the rotor 32 and the inner circumferential surface of the housing 20. The inner ring of the outer rotor bearing 92 is fixed to the outer circumferential surface of the rotor 32, and the outer ring of the outer rotor bearing 92 is fixed to the inner circumferential surface of the housing 20. The outer rotor bearing 92 is used to support the rotor 32 so that the rotor 32 rotates more smoothly relative to the housing 20. In one embodiment, along the axial direction of the brake motor 30, the outer rotor bearing 92 is located on the side of the rotor 32 close to the brake caliper 10. In this case, the outer rotor bearing 92 and the connecting ring 33 are respectively located on opposite sides of the rotor 32. The outer rotor bearing 92 and the connecting ring 33 can respectively support the rotor 32 from both sides of the rotor 32, further improving the rotational stability of the rotor 32 and improving the transmission efficiency of the electronic mechanical brake device 100.

[0132] As mentioned above, the electronic mechanical brake device 100 of the present application may include a circuit board 50. In one embodiment, along the axial direction of the brake motor 30, the circuit board 50, the planetary gear set 43 of the coaxial reducer 40, and the brake caliper 10 are arranged in sequence, with the circuit board 50 and the brake caliper 10 located on opposite sides of the planetary gear set 43.

[0133] Specifically, as shown in Figure 16 , the circuit board 50 is positioned on the side of the planetary gear set 43 away from the brake caliper 10, eliminating the need for a clearance hole in the circuit board 50 to clear the output shaft 42 of the coaxial reducer 40. Furthermore, the circuit board 50 is relatively close to the brake motor 30, facilitating the routing of wiring within the electromechanical brake device 100. In one embodiment, the plane of the circuit board 50 is perpendicular to the axial direction of the brake motor 30, thereby shortening the size of the electromechanical brake device 100 along the axial direction of the brake motor 30.

[0134] Please continue to refer to Figure 16, which also illustrates one implementation of the position sensor 70. Specifically, the position sensor 70 of the electronic mechanical brake device 100 includes a stator 71 and a rotor 72. The circuit board 50 is used to fix the stator 71 of the position sensor 70, and the input shaft 41 of the coaxial reducer 40 is used to coaxially transmit the rotor 72 of the position sensor 70. Specifically, the end of the input shaft 41 that faces the circuit board 50 extends toward the circuit board 50. The rotor 72 of the position sensor 70 can be fixed to the input shaft 41 and aligned with the stator 71 of the position sensor 70 fixed to the circuit board 50. The rotor 72 of the position sensor 70 rotates with the input shaft 41, and the stator 71 of the position sensor 70 is used to detect the rotation angle of the rotor 72 of the position sensor.

[0135] Based on the different working principles of the position sensor 70, the stator 71 and rotor 72 of the position sensor 70 can be aligned with each other in the axial direction of the brake motor 30 or in the radial direction of the brake motor 30. When the stator 71 and rotor 72 of the position sensor 70 are aligned in the axial direction of the brake motor 30, the rotor 72 of the position sensor 70 can be fixed to the end of the input shaft 41 of the coaxial reducer 40 facing the circuit board 50, leaving a gap between the stator 71 and rotor 72 of the position sensor 70 along the axial direction of the brake motor 30.

[0136] When the stator 71 and rotor 72 of the position sensor 70 are aligned radially with respect to the brake motor 30, as shown in FIG16 , the stator 71 of the position sensor 70 has an inner hole, the axis of which coincides with the axis of the brake motor 30, and the input shaft 41 of the coaxial reducer 40 extends toward the circuit board 50. The end of the input shaft 41 passes through the circuit board 50, and the rotor 72 of the position sensor 70 is fixed to the outer circumference of the input shaft 41. The inner hole of the stator 71 of the position sensor 70 is used to at least partially accommodate the rotor 72 of the position sensor 70. At this point, a gap is left between the stator 71 and the rotor 72 of the position sensor 70 radially with respect to the brake motor 30.

[0137] FIG16 also illustrates a method for implementing a locking mechanism 60. In this implementation, the locking mechanism 60 is arranged along the axial direction of the brake motor 30 on the side of the input shaft 41 away from the brake caliper 10. The locking mechanism 60 is used to lock or release the end of the input shaft 41. Specifically, the locking mechanism 60 includes a clutch 61 and a locking motor 62. The locking motor 62 is fixed in the inner cavity of the housing 20, and the clutch 61 can lock or release the end of the input shaft 41 under the drive of the locking motor 62. The circuit board 50 can also be used to fix the control circuit of the locking motor 62, and the control circuit of the locking motor 62 is used to output AC power to drive the locking motor 62.

[0138] Referring to Figure 17 , the input shaft 41 of the coaxial reducer 40 has an inner hole 411 at its end. The clutch 61 includes an inner wheel 611, a movable member 612, a spring 613, and an axially movable member 614. The inner wheel 611 is embedded within the inner hole 411, and the movable member 612 and spring 613 are both received in a groove in the inner wheel 611. One end of the spring 613 abuts against the movable member 612, while the other end abuts against the inner wall of the groove in the inner wheel 611. The spring 613 is used to push the movable member 612 toward the inner wall of the groove on the other side of the inner wheel 611.

[0139] The axially movable member 614 is driven by the locking motor 62 to slide within the housing 20, and the sliding direction of the axially movable member 614 is parallel to the axial direction of the input shaft 41. The axially movable member 614 is driven to extend into or out of the inner hole 411 of the input shaft 41. When the axially movable member 614 extends into the inner hole 411 of the input shaft 41, the axially movable member 614 abuts against the movable member 612 and drives the movable member 612 to slide toward one side of the spring 613; when the axially movable member 614 exits the inner hole 411 of the input shaft 41, the axially movable member 614 releases the movable member 612, and the movable member 612 slides toward the side away from the spring 613 under the action of the spring 613.

[0140] The groove bottom of the inner wheel 611 is tilted, and the movable member 612 switches between two positions, correspondingly changing its radial height relative to the inner wheel 611. When the movable member 612 is at a higher radial height, it abuts against the inner circumference of the inner bore 411 of the input shaft 41, thereby locking the end of the input shaft 41. When the movable member 612 is at a lower radial height, it releases the inner circumference of the inner bore 411 of the input shaft 41, thereby releasing the end of the input shaft 41. Thus, the locking mechanism 60, through the control of the clutch 61 by the locking motor 62, can lock or release the end of the input shaft 41, thereby achieving the parking function.

[0141] In one embodiment, the electronic mechanical brake device 100 may further include a locking bearing 93, which is used to support the input shaft 41 of the coaxial reducer 40. For details, please refer to Figure 18 . As shown in Figure 18 , the locking bearing 93 is disposed on the side of the circuit board 50 away from the planetary gear set 43. The inner ring of the locking bearing 93 is fixed to the outer circumferential surface of the input shaft 41, and the outer ring of the locking bearing 93 is fixed to the inner wall of the housing 20. Because the input shaft 41 of the coaxial reducer 40 extends a long distance toward the circuit board 50, disposing the locking bearing 93 on the side of the circuit board 50 away from the planetary gear set 43 can provide better support for the input shaft 41.

[0142] In other embodiments, the locking mechanism 60 can be coaxially arranged with the input shaft 41 of the coaxial reducer 40, and the locking mechanism 60 is used to lock or release the outer peripheral surface of the input shaft 41 of the coaxial reducer 40. Specifically, please refer to the schematic diagrams of Figures 19 and 20. In one embodiment, the locking mechanism 60 includes a sleeve 63, an electromagnetic coil 64 and an axial displacement member 65. The sleeve 63 is used to fix the outer peripheral surface of the input shaft 41, the electromagnetic coil 64 is sleeved outside the sleeve 63, and the electromagnetic coil 64 is fixed to the housing 20. The circuit board 50 is used to fix the control circuit of the electromagnetic coil 64, and the control circuit of the electromagnetic coil 64 is used to control the conduction or disconnection of the electromagnetic coil 64. The electromagnetic coil 64 is used to drive the axial displacement member 65 to slide toward or away from the sleeve 63 to lock or release the input shaft 41.

[0143] In this embodiment, the axial displacement member 65 and the sleeve 63 are spaced apart along the axial direction of the input shaft 41. A locking structure that engages with each other is provided between the axial displacement member 65 and the sleeve 63 along the radial direction of the brake motor 30. For example, the sleeve 63 may be provided with an inner hole, and the axial displacement member 65 may be driven by the electromagnetic coil 64 to partially slide into the inner hole of the sleeve 63. The portion of the axial displacement member 65 located outside the inner hole of the sleeve 63 may be retained by the housing 20. The outer circumferential surface of the portion of the axial displacement member 65 that extends into the sleeve 63 engages with the inner circumferential surface of the sleeve 63, allowing the axial displacement member 65 to retain the sleeve 63 and, through the sleeve 63, act on the outer circumferential surface of the input shaft 41, thereby locking the transmission function of the coaxial reducer 40 to achieve a parking effect.

[0144] When the parking state needs to be released, the electromagnetic coil 64 is de-energized, and the axial displacement member 65 can withdraw from the inner hole of the sleeve 63 under the action of the telescopic spring 66, thereby releasing the outer peripheral surface of the input shaft 41, and the coaxial reducer 40 resumes the transmission function.

[0145] In other embodiments, an inner hole may be provided on the side of the axial displacement member 65 facing the sleeve 63, and the axial displacement member 65 may be slidably mounted on the outer side of the sleeve 63. The inner circumference of the inner hole of the axial displacement member 65 engages with the outer circumference of the sleeve 63, thereby securing the sleeve 63. The axial displacement member 65 acts on the outer circumference of the input shaft 41 through the sleeve 63, locking the transmission function of the coaxial reducer 40 and achieving the parking effect. To release the parking state, the electromagnetic coil 64 is de-energized, and the axial displacement member 65, acting under the action of the expansion spring 66, slides away from the sleeve 63, thereby releasing the outer circumference of the input shaft 41 and resuming the transmission function of the coaxial reducer 40.

[0146] The telescopic spring 66 can be implemented by a disc spring, a wave spring, or the like.

[0147] Of course, the above-mentioned embodiments can be applied individually or in combination. The above is the preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. An electromechanical brake device with a built-in reducer, characterized in that: The electronic mechanical brake device comprises a housing, a brake motor, a coaxial reducer and a brake caliper, wherein the brake motor is used to drive the brake caliper to drive the friction plate through the coaxial reducer, wherein: The housing is used to accommodate the stator, rotor and planetary gear set of the brake motor and the coaxial reducer, and the rotor is used to drive the planetary gear set; The stator, the rotor and the output shaft are coaxially arranged, and the planetary gear set is at least partially embedded in a center hole of the stator or the rotor.

2. The electromechanical brake device according to claim 1, characterized in that: The brake motor includes a connecting ring, and the connecting ring, the planetary gear set and the brake caliper are arranged in sequence along the axial direction of the brake motor. The outer ring of the connecting ring is coaxially fixed with the rotor, and the inner ring of the connecting ring is used for coaxially driving the sun gear of the planetary gear set.

3. The electromechanical brake device according to claim 1 or 2, characterized in that: The housing includes a support cylinder, which is coaxially arranged with the stator, the rotor and the planetary gear set. The inner circumferential surface of the support cylinder is used to fix the ring gear of the planetary gear set, and the ring gear is used to support multiple planetary gears of the planetary gear set.

4. The electromechanical brake device according to claim 3, characterized in that: The inner circumference of the housing is used to fix the outer circumference of the stator, and the central hole of the stator is used to accommodate the rotor; or, The outer circumferential surface of the support cylinder is used to fix the inner circumferential surface of the stator, and the central hole of the rotor is used to accommodate the stator.

5. The electromechanical brake device according to claim 3, characterized in that: The planetary gear set includes at least two stages of planetary gear trains, which are arranged at intervals along the axial direction of the brake motor. The inner circumference of the support cylinder is used to fix at least two gear rings, and the at least two gear rings belong to different stages of the planetary gear trains.

6. The electromechanical brake device according to any one of claims 1 to 5, characterized in that: The rotor of the brake motor comprises a rotor support and a plurality of magnetic sheets. The rotor support is cylindrical. The plurality of magnetic sheets are uniformly surrounded and fixed to the circumferential surface of the rotor support facing the stator of the brake motor along the circumferential direction of the rotor support.

7. The electromechanical brake device according to any one of claims 1 to 6, characterized in that: The electromechanical brake device comprises a circuit board, the circuit board is used to fix a drive circuit, the drive circuit is used to drive the brake motor, wherein: Along the axial direction of the brake motor, the circuit board, the planetary gear set of the coaxial reducer and the brake caliper are arranged in sequence, and the circuit board and the brake caliper are located on opposite sides of the planetary gear set.

8. The electromechanical brake device according to claim 7, characterized in that: The electromechanical brake device comprises a position sensor, which is used to detect the rotation angle of the brake motor. The position sensor comprises a stator and a rotor, wherein: The circuit board is used to fix the stator of the position sensor; The input shaft of the coaxial reducer is used for coaxially driving the rotor of the position sensor.

9. The electromechanical brake device according to claim 7, characterized in that: The stator of the position sensor is provided with an inner hole, the axis of the inner hole of the stator of the position sensor coincides with the axis of the brake motor, the input shaft of the coaxial reducer extends toward the circuit board, and the inner hole of the stator of the position sensor is used to at least partially accommodate the rotor of the position sensor.

10. The electromechanical brake device according to claim 9, characterized in that: The electromechanical brake device comprises a locking mechanism, which is used to lock or release the input shaft of the coaxial reducer, wherein: The locking mechanism is coaxially arranged with the input shaft, and the locking mechanism is used to lock or release the outer peripheral surface of the input shaft of the coaxial reducer; or, The locking mechanism is arranged along the axial direction of the brake motor at a side of the input shaft away from the brake caliper, and the locking mechanism is used to lock or release the end of the input shaft.

11. The electromechanical brake device according to claim 10, characterized in that: The locking mechanism includes a sleeve, an electromagnetic coil and an axial displacement member, wherein the sleeve is used to be fixedly connected to the outer peripheral surface of the input shaft, the electromagnetic coil is sleeved outside the sleeve, the circuit board is used to fix the control circuit of the electromagnetic coil, the control circuit is used to control the electromagnetic coil to be turned on or off, and the electromagnetic coil is used to drive the axial displacement member to slide toward or away from the sleeve to lock or release the input shaft.

12. The electromechanical brake device according to claim 10, characterized in that: The locking mechanism includes a clutch and a locking motor. The circuit board is used to fix the control circuit of the locking motor. The control circuit of the locking motor is used to output AC power to drive the locking motor. The locking motor is used to control the clutch to lock or release the end of the input shaft.

13. The electromechanical brake device according to any one of claims 1 to 12, characterized in that: The brake caliper includes a lead screw, a sleeve and a caliper. The lead screw is coaxially driven with the output shaft of the coaxial reducer. The sleeve is sleeved on the outside of the lead screw. The caliper is located on the side of the sleeve away from the brake motor along the axis of the output shaft. The lead screw rotates with the output shaft to drive the sleeve to slide axially along the output shaft. The sleeve is used to drive the caliper to slide and drive the friction plate.

14. An electromechanical braking system, characterized in that: The invention comprises at least one friction plate and an electronic mechanical braking device as claimed in any one of claims 1 to 13, wherein the electronic mechanical braking device is used to drive the at least one friction plate to move along the axial direction of the brake motor to brake the wheel.

15. A vehicle, characterized in that: It comprises a wheel and an electronic mechanical braking system as claimed in claim 14, wherein the axial direction of the brake motor in the electronic mechanical braking system is parallel to the axial direction of the wheel, and the friction plate in the electronic mechanical braking system is used to move toward the brake disc of the wheel to brake the vehicle.

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