Electromechanical brake device and vehicle

Abstract

The application provides an electromechanical brake device and a vehicle. The electromechanical brake device comprises friction plates arranged at intervals and pistons for receiving the driving of a brake motor of the electromechanical brake device and pushing the friction plates to contact a brake disc to realize braking, wherein when the end of the piston in the axial direction of the brake disc is used to contact the friction plate, a gap is formed between the end of the piston and the friction plate, and the opening of the gap is directed to a connecting bridge of the electromechanical brake device, the connecting bridge is used to connect the parts of the electromechanical brake device arranged on both sides of the brake disc in the axial direction of the brake disc. The electromechanical brake device provided by the application optimizes the gap shape between the piston and the friction plate in the electromechanical brake device, improves the stress condition of the friction plate during braking, and reduces the eccentric wear phenomenon.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to an electromechanical braking device and a vehicle. Background Technology

[0002] Electromechanical braking systems are used to drive friction pads to brake brake discs. Due to limitations in the wheel well space of the vehicle, uneven force is applied to the friction pads during braking, leading to uneven wear. Over time, this affects the vehicle's braking performance and shortens its lifespan. Utility Model Content

[0003] This application provides an electromechanical braking device and a vehicle. By optimizing the gap shape between the piston and the friction pad in the electromechanical braking device, the stress conditions of the friction pad during braking are improved, thereby reducing uneven wear.

[0004] In a first aspect, this application provides an electromechanical braking device, which includes friction pads and a piston arranged at intervals. The piston is used to receive a brake motor drive from the electromechanical braking device and push the friction pads to contact a brake disc to achieve braking. When the end of the piston along the axial direction of the brake disc is in contact with the friction pad, there is a gap between the end of the piston and the friction pad. The opening of the gap faces the connecting bridge of the electromechanical braking device. The connecting bridge is used to connect the portions of the electromechanical braking device arranged on both sides of the brake disc along the axial direction of the brake disc.

[0005] The electromechanical braking device provided in this application is fixedly connected to the portions of the electromechanical braking device arranged on both sides of the brake disc via a connecting bridge. The overall structure of the electromechanical braking device is U-shaped, with the opening of the U-shape facing the brake disc. During the braking process, when the piston pushes the friction pads into contact with the brake disc, the electromechanical braking device provided in this application adjusts the force on the friction pads through the gap between the piston and the friction pads. During braking, the friction pads are subjected to the reverse pressure of the brake disc, which causes the opening of the U-shaped structure of the electromechanical braking device to increase. Because the gap is larger at the edge closest to the piston and the connecting bridge, it can offset the deformation of the U-shaped electromechanical braking device, thereby improving the force on the friction pads, reducing uneven wear, improving the reliability of the electromechanical braking device, and extending its service life.

[0006] In one implementation, the end of the piston is a plane, and the space between the end of the piston and the friction plate is used to form a gap.

[0007] In this implementation, the end of the piston along the axial direction of the brake disc is arranged opposite to the friction pad via a plane, and the plane of the piston end is inclined relative to the friction pad. The gap between the plane of the piston end and the friction pad gradually decreases from the connecting bridge towards the brake disc. As the piston moves towards the brake disc, the edge of the piston end furthest from the connecting bridge contacts the friction pad first, and the pressure of the piston end near the connecting bridge contacting the friction pad gradually decreases, thereby improving the deformation of the U-shaped electromechanical braking device and making the force on the friction pad more uniform.

[0008] One implementation method is that the included angle of the gap is greater than 0 degrees and less than or equal to 0.5 degrees.

[0009] In this implementation, the included angle of the gap matches the deformation angle formed by the increased opening of the U-shaped electromechanical braking device during braking, thereby making the contact area between the plane at the end of the piston and the friction plate larger during braking, thus improving the uneven wear phenomenon of the friction plate.

[0010] One implementation method is to have an included angle of 0.3 degrees between the gaps.

[0011] In one implementation, the piston end includes a first plane and a second plane. Along the direction of the brake disc and connecting bridge arrangement, the first plane is located between the second plane and the connecting bridge. The space between the first plane and the friction pad forms a gap, the angle of which is greater than 0 degrees and less than or equal to 0.5 degrees. The second plane is arranged parallel to the friction pad along the axial direction of the brake disc.

[0012] In this implementation, the piston end along the brake disc's axial direction is arranged opposite to the friction pad via two planes. One plane, the second plane, is parallel to the friction pad along the brake disc's axial direction, increasing the contact area between the piston end and the friction pad. The other plane, the first plane, is inclined relative to the friction pad, and the gap between the first plane and the friction pad gradually decreases from the connecting bridge towards the brake disc along the brake disc's axial direction. As the piston moves towards the brake disc, the second plane at the piston end first contacts the friction pad, and the pressure on the friction pad near the connecting bridge gradually decreases from the first plane onwards, thereby improving the deformation of the U-shaped electromechanical braking device and making the friction pad more evenly stressed.

[0013] In this implementation, the included angle between the first plane and the friction plate matches the deformation angle formed by the increased opening of the U-shaped electromechanical braking device during braking, thereby making the contact area between the first plane at the end of the piston and the friction plate larger during braking, thus improving the uneven wear phenomenon of the friction plate.

[0014] In one implementation, the piston end includes a notch that extends radially from the outer circumferential surface of the piston toward the center of the piston, and the sidewall of the notch extends axially toward the friction plate along the brake disc, with the space between the sidewall and the friction plate forming a gap.

[0015] In this implementation, a notch is created at the end of the piston near the connecting bridge to form a gap, ensuring that the piston end is spaced apart from the friction pad along the axial direction of the brake disc at its closest edge to the connecting bridge. As the piston moves towards the brake disc, the end of the piston furthest from the connecting bridge contacts the friction pad first, reducing the pressure on the friction pad at the point near the connecting bridge. This improves the deformation of the U-shaped electromechanical braking device and makes the force on the friction pad more uniform.

[0016] In one implementation, the notch has a circular annular shape, with the center of the notch coinciding with the center of the piston.

[0017] In this implementation, the end of the piston forms a circle facing the surface of the friction plate, and the center of the circle coincides with the center of the piston. The contact area between the end of the piston and the friction plate is relatively large, which can better push the friction plate into contact with the brake disc and reduce uneven wear.

[0018] In one implementation, the planar shape of the notch is an arc, and the length of the notch along the direction of the connection bridge and the brake disc is greater than or equal to 1 / 4 of the piston diameter and less than or equal to 1 / 2 of the piston diameter.

[0019] In this implementation, an arc-shaped notch is formed at the end of the piston facing the surface of the friction plate. The arc-shaped notch is used to reduce the pressure transmitted to the friction plate from the end of the piston near the connecting bridge. By limiting the length of the arc-shaped notch, it can be ensured that the contact force between the end of the piston and the friction plate during braking can counteract the deformation effect of the U-shaped electromechanical braking device.

[0020] In one implementation, the end of the piston includes a central groove that receives the center of the piston, with the groove opening of the central groove facing the friction plate along the axial direction of the brake disc.

[0021] In this implementation, the piston end avoids the geometric center of the piston through the central groove, so that the piston end has a more uniform thrust distribution on the friction pad along the radial direction of the brake disc, which can eliminate the central wear phenomenon when the piston end pushes the friction pad into contact with the brake disc.

[0022] In one implementation, the planar shape of the central groove is circular, the center of the central groove coincides with the center of the piston, and the diameter of the central groove is greater than or equal to the radius of the piston.

[0023] In this implementation, the piston end is provided with a notch near the connecting bridge and a central groove, which makes the thrust of the piston end on the friction plate more uniform. During braking, the notch reduces the pressure at the piston end near the connecting bridge, thus counteracting the deformation effect of the U-shaped electromechanical braking device.

[0024] In one implementation, the notch has a circular arc shape, and the end of the piston includes another notch. Along the direction of the connecting bridge and the brake disc, the other notch and the first notch are located on opposite sides of the center of the piston, and a central groove is used to connect the first notch and the second notch.

[0025] In this implementation, the planar shape of the piston end is divided into two spaced regions by a central groove and two notches, and the two regions are spaced apart along a direction perpendicular to the arrangement of the connecting bridge and the brake disc. The thrust of the piston end on the friction pads reduces the phenomenon of central wear and distributes the force more evenly along the direction perpendicular to the arrangement of the connecting bridge and the brake disc.

[0026] In one implementation, the planar shape of the other notch is an arc, and along the direction perpendicular to the arrangement of the connecting bridge and the brake disc, the width of the central groove is smaller than the width of one notch and smaller than the width of the other notch.

[0027] In this implementation, the larger distance between the two areas makes the pressure distribution between the friction pad and the brake disc more uniform, and the larger width of the two notches facilitates the machining of the two areas at the end of the piston.

[0028] In one implementation, along a direction perpendicular to the arrangement of the connecting bridge and the brake disc, the width of the central groove is greater than or equal to 1 / 4 of the piston diameter and less than or equal to 1 / 2 of the piston diameter.

[0029] In this implementation, the distance between the two regions at the end of the piston is less than or equal to the sum of the lengths of the two regions, ensuring that the lengths of each region are within a certain range, thus ensuring a more uniform pressure distribution between the friction pad and the brake disc.

[0030] One implementation involves a notch and another notch being axially symmetrical about the geometric center of the first surface along the direction in which the brake disc and connecting bridge are arranged.

[0031] In this implementation, by setting the two notches to be symmetrical in shape, and the two spaced areas to be axially symmetrical along the direction of the brake disc and the connecting bridge, the thrust of the piston along this direction is made more uniform, thereby reducing the uneven wear of the friction plate.

[0032] In one implementation, the planar shape of the piston end is axially symmetrical, and the axis of symmetry of the piston end extends along the arrangement direction of the connecting bridge and the brake disc.

[0033] In this implementation, the piston end has an axisymmetric shape, which makes the piston end exert a more uniform thrust on the friction plate in a direction perpendicular to the arrangement of the brake disc and the connecting bridge, thereby reducing the uneven wear of the friction plate.

[0034] In one implementation, the electromechanical braking device includes a caliper with a receiving groove for receiving and slidably connecting to a piston. Along the radial direction of the piston, one of the outer peripheral surfaces of the piston and the inner peripheral surface of the receiving groove includes a protrusion, and the other includes a groove between the outer peripheral surface of the piston and the outer peripheral surface of the receiving groove. The protrusion is used to engage with the groove to restrict rotation of the piston within the receiving groove.

[0035] In this implementation, the receiving groove and the piston are interlocked radially to restrict the circumferential rotation of the piston, thereby ensuring that the gap opening between the end of the piston and the friction plate always faces the connecting bridge during the sliding process of the piston in the electromechanical braking device.

[0036] In one implementation, the electromechanical braking device includes a caliper, which comprises a first caliper body, a second caliper body, and a connecting bridge. The first caliper body, friction pads, and second caliper body are arranged sequentially at intervals along the axial direction of the brake disc. The connecting bridge is arranged on one side of the brake disc along the radial direction and is used to fixably connect the first caliper body and the second caliper body. The first caliper body is used to slide and connect a piston.

[0037] In this implementation, the electromechanical braking device forms a U-shaped caliper by connecting the first caliper and the second caliper via a connecting bridge, and achieves braking by pushing the friction pads to contact the brake disc through a piston slidably connected to the first caliper.

[0038] In one implementation, the first clamp body includes a receiving groove for receiving a piston.

[0039] In one implementation, the electromechanical braking device includes another friction pad, with the friction pad and the other friction pad arranged on both sides of the brake disc along the axial direction of the brake disc, and the other friction pad mounted on a second caliper.

[0040] In one implementation, the length direction of the friction pad is perpendicular to the arrangement direction of the brake disc and the connecting bridge, thereby increasing the contact area between the friction pad and the brake disc to ensure reliable braking.

[0041] In one implementation, the friction pad along the axial direction of the brake disc includes a first contact surface facing the piston, the first contact surface being perpendicular to the axis of the brake disc.

[0042] In this implementation, without changing the shape of the friction pads, the electromechanical braking device can maintain the compatibility and interchangeability of the friction pads by setting an inclined plane or a notch at the end of the piston to form a gap, which facilitates the assembly and maintenance of the electromechanical braking device.

[0043] In one implementation, the piston's receiving groove is also used to accommodate a lead screw nut. The nut in the lead screw nut is sleeved on the outer circumferential surface of the lead screw and meshes with the lead screw. The nut is also arranged along the axial direction of the brake disc on the side of the piston away from the friction plate. The lead screw is used to receive drive rotation and drive the nut to slide along the axial direction of the brake disc. The nut is used to drive the piston to push the friction plate.

[0044] In this implementation, the first clamp body accommodates the lead screw nut and piston via a receiving groove, and the groove wall abuts against the nut and piston respectively to form a sliding connection. The electromechanical braking device has a relatively compact structure, allowing the lead screw of the lead screw nut to receive the drive and drive the piston to push the friction plate through the nut.

[0045] In one implementation, the first clamp body includes a mounting surface that is axially opposite to the friction pad along the brake disc. The mounting surface is used to fix a brake motor and a reducer, the brake motor driving a lead screw nut and a piston through the reducer.

[0046] In one implementation, the electromechanical braking device includes a caliper holder fixed to the vehicle frame and used for slidingly connecting a first caliper body. A piston is also used to receive a drive and cause the caliper to slide relative to the caliper holder so as to cause another friction pad to contact the brake disc.

[0047] In this implementation, the first caliper body is slidably connected to the caliper bracket. After the piston drives the friction pad to contact the brake disc, it can further drive the caliper to slide, and the second caliper body drives another friction pad to contact the brake disc. The two friction pads move relative to each other from both sides of the brake disc to clamp the brake disc and achieve braking.

[0048] Secondly, this application provides a vehicle including wheels and an electromechanical braking device provided in any of the above-described implementations. The electromechanical braking device is fixed to the vehicle frame and is used to brake the brake discs of the wheels. The vehicle provided by this application, by employing the aforementioned electromechanical braking device, improves braking reliability and service life. Attached Figure Description

[0049] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of the structure of a vehicle at the wheel location according to one embodiment of this application;

[0051] Figure 2A schematic diagram of the frame of an electromechanical braking device provided in one embodiment of this application;

[0052] Figure 3 This is a schematic diagram of the caliper structure in an electromechanical braking device provided in one embodiment of this application;

[0053] Figure 4 This is a schematic diagram of the internal structure of the caliper in an electromechanical braking device provided in one embodiment of this application;

[0054] Figure 5 This is a schematic diagram of the structure of the electromechanical braking device provided in one embodiment of this application, showing the contact between the piston and the first friction plate;

[0055] Figure 6 This is a schematic diagram of the caliper structure in an electromechanical braking device provided in one embodiment of this application;

[0056] Figure 7 This is a schematic diagram of the structure of the electromechanical braking device provided in one embodiment of this application, showing the contact between the piston and the first friction plate;

[0057] Figure 8 This is a schematic diagram of the caliper structure in an electromechanical braking device according to one embodiment of this application;

[0058] Figure 9 This is a schematic diagram of the structure of the electromechanical braking device provided in one embodiment of this application, showing the contact between the piston and the first friction plate;

[0059] Figure 10 This is a schematic diagram of the piston structure in an electromechanical braking device according to one embodiment of this application;

[0060] Figure 11 This is a schematic diagram of the piston structure in an electromechanical braking device according to one embodiment of this application;

[0061] Figure 12 This is a schematic diagram of the piston structure in an electromechanical braking device according to one embodiment of this application;

[0062] Figure 13 This is a schematic diagram of the piston structure in an electromechanical braking device according to one embodiment of this application;

[0063] Figure 14 This is a schematic diagram of the piston structure in an electromechanical braking device according to one embodiment of this application;

[0064] Figure 15 This is a schematic diagram of the piston structure in an electromechanical braking device according to one embodiment of this application. Detailed Implementation

[0065] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0066] This application provides an electromechanical braking device, which includes spaced friction pads and a piston. The piston receives a brake motor drive from the electromechanical braking device and pushes the friction pads into contact with a brake disc to achieve braking. A gap exists between the piston end and the friction pad when they contact each other along the axial direction of the brake disc. The opening of the gap faces a connecting bridge of the electromechanical braking device, which connects the portions of the electromechanical braking device arranged on both sides of the brake disc along the axial direction of the brake disc. The electromechanical braking device provided in this application adjusts the force on the friction pads through the gap between the piston and the friction pads to counteract the deformation of the U-shaped electromechanical braking device, thereby improving the force on the friction pads, reducing uneven wear, improving the reliability of the electromechanical braking device, and extending its service life.

[0067] This application provides a vehicle including wheels and an electromechanical braking device provided concurrently with this application. The electromechanical braking device is fixed to the vehicle frame and is used to brake the brake discs of the wheels. The vehicle provided by this application improves braking reliability and service life by employing the aforementioned electromechanical braking device.

[0068] Please see Figure 1 and Figure 2 ,in Figure 1 This illustration shows a structural diagram of a vehicle at wheel 200 according to an embodiment of this application; Figure 2 This illustration shows a schematic diagram of the frame of an electromechanical braking device 100 provided in one embodiment of this application.

[0069] The vehicle provided in this application includes a wheel 200 and an electromechanical braking device 100. The wheel 200 is rotatably connected to the vehicle frame. The wheel 200 includes a brake disc 201. The brake disc 201 is fixed to the wheel hub of the wheel 200. During vehicle operation, the brake disc 201 rotates synchronously with the wheel hub of the wheel 200. The electromechanical braking device 100 is the electromechanical braking device provided in this embodiment of the application. The electromechanical braking device 100 is fixed to the vehicle frame. The electromechanical braking device 100 contacts the brake disc 201 to generate friction, thereby limiting the rotation of the wheel 200 to brake the vehicle.

[0070] The electromechanical braking device 100 provided in this application includes a piston 10 and a friction pad 50. The piston 10 and the friction pad 50 are arranged at intervals along the axial direction of the brake disc 201. The piston 10 is used to receive the drive of the electromechanical braking device 100 and push the friction pad 50 to contact the brake disc 201 to achieve braking.

[0071] In one embodiment, the electromechanical braking device 100 includes a caliper 30. The caliper 30 is slidably connected to a piston 10, which is driven to slide relative to the caliper 30 along the axial direction of the brake disc 201 and push a friction pad 50 to brake the brake disc 201.

[0072] In one embodiment, the electromechanical braking device 100 includes a brake motor 20 and a reducer 40. The brake motor 20 and reducer 40 are fixed to a caliper 30. The brake motor 20 outputs braking force. The reducer 40 receives the braking force and drives a piston to push a friction pad 50 to brake. That is, the reducer 40 drives the motor shaft of the brake motor 20 and the friction pad 50. The brake motor 20 drives the friction pad 50 toward the brake disc 201 via the reducer 40, causing the friction pad 50 to contact the brake disc 201 and generate friction, thereby limiting the rotation of the wheel 200 to brake the vehicle. The piston 10 receives the drive from the brake motor 20 and pushes the friction pad 50 into contact with the brake disc 201.

[0073] In one embodiment, the brake motor 20 includes a motor shaft, a motor stator, and a motor rotor. The motor stator is coaxially sleeved around the motor rotor. The motor shaft is fixedly connected to the motor rotor. The motor stator receives drive signals to generate an alternating magnetic field, thereby driving the motor rotor and motor shaft to rotate synchronously to output braking force.

[0074] In one embodiment, the electromechanical braking device 100 includes a lead screw nut 60. The lead screw nut 60 is received within the caliper 30. The lead screw nut 60 includes a lead screw 62 and a nut 61, which mesh with each other. The lead screw 62 or nut 61 in the lead screw nut 60 is used to receive the drive rotation of the reducer 40, and the nut 61 or lead screw 62 in the lead screw nut 60 is used to drive the friction plate 50 to slide towards the brake disc 201.

[0075] In one embodiment, piston 10 is housed within caliper 30, and piston 10 is arranged axially between lead screw nut 60 and friction plate 50. Lead screw nut 60 can push piston 10 to slide within caliper 30. Piston 10 is used to receive drive from lead screw nut 60 to push friction plate 50 to brake brake disc 201.

[0076] In one embodiment, the electromechanical braking device 100 comprises two parts, which are positioned on opposite sides of the brake disc 201 along its axial direction. The electromechanical braking device 100 also includes another friction pad 50, which, along with the other friction pad 50, is positioned on opposite sides of the brake disc 201 along its axial direction. The brake motor 20 drives the two friction pads 50 to slide towards the brake disc 201 to brake the brake disc 201.

[0077] In one embodiment, the electromechanical braking device 100 has two parts for mounting one friction pad 50 and another friction pad 50, respectively. Along the axial direction of the brake disc 201, the piston 10 and one friction pad 50 are arranged on one side of the brake disc 201, and the other friction pad 50 is arranged on the other side of the brake disc 201. In this embodiment, the friction pad 50 arranged on the same side of the brake disc 201 as the piston 10 is defined as the first friction pad 51, and the other friction pad 50 is defined as the second friction pad 52. Thus, along the axial direction of the brake disc 201, the piston 10, the first friction pad 51, the brake disc 201, and the second friction pad 52 are arranged sequentially.

[0078] In one embodiment, the electromechanical braking device 100 provided in this application further includes a housing. The housing is used for fixed connection with the caliper 30 and for accommodating the reducer 40. The caliper 30 is used to accommodate the piston 10. In one embodiment, the housing is used to accommodate and fix the motor stator of the brake motor 20.

[0079] In one embodiment, the caliper 30 is used to receive and secure the motor stator of the brake motor 20.

[0080] In one embodiment, the electromechanical braking device 100 further includes a caliper bracket 101, which is fixed to the vehicle frame and slidably connected to the caliper 30. The caliper bracket 101 is also used to slidably connect two friction pads 50. The piston 10 is also used to receive a drive and drive the caliper 30 to slide relative to the caliper bracket 101, thereby causing the second friction pad 52 to contact the brake disc 201. In this embodiment, by slidably connecting the caliper 30 to the caliper bracket 101, after the piston 10 drives the first friction pad 51 to contact the brake disc 201, it can further drive the caliper 30 to slide, and through the caliper 30, drive the second friction pad 52 to contact the brake disc 201. The first friction pad 51 and the second friction pad 52 move relative to each other from both sides of the brake disc 201 to clamp the brake disc 201 and achieve braking.

[0081] During the braking process of the vehicle, the power output from the motor shaft of the brake motor 20 is transmitted sequentially through the reducer 40, the lead screw nut 60 and the piston 10 to the two friction pads 50, thereby driving the friction pads 50 to slide toward the brake disc 201 from both sides of the brake disc 201 to brake the wheel 200.

[0082] During vehicle operation, when the stator of the brake motor 20 receives a braking signal, the stator drives the rotor to rotate the motor shaft. The motor shaft, through the reducer 40, drives the lead screw nut 60 to rotate synchronously, creating axial displacement along the lead screw nut 60 within the caliper 30. The lead screw nut 60, in turn, pushes a friction pad 50 towards the brake disc 201 via the piston 10. After the friction pad 50 contacts the brake disc 201, the brake motor 20 continues to output braking force through the motor shaft, causing the caliper 30 to move relative to the caliper bracket 101 and drive another friction pad 50 towards the brake disc 201. Thus, the two friction pads 50 clamp the brake disc 201 from both sides, creating friction between the two friction pads 50 and the brake disc 201 to brake the wheels 200.

[0083] Please see Figure 3 , Figure 3 This illustration shows a structural diagram of the caliper 30 in an electromechanical braking device 100 provided in one embodiment of this application.

[0084] In one embodiment, the caliper 30 is a U-shaped caliper. The caliper 30 includes a first clamping body 31, a second clamping body 32, and a connecting bridge 33. The connecting bridge 33 extends axially along the brake disc 201 and is spaced apart from the brake disc 201 radially. The connecting bridge 33 connects the two portions of the electromechanical braking device 100 that are positioned on both sides of the brake disc 201 along its axial direction. The first clamping body 31 and the second clamping body 32 of the caliper 30 are positioned on both sides of the brake disc 201 along its axial direction. The connecting bridge 33 securely connects the first clamping body 31 and the second clamping body 32. The first clamping body 31 and the second clamping body 32 extend approximately radially along the brake disc 201, and extend from the connecting bridge 33 toward the central axis of the brake disc 201.

[0085] In this embodiment, the first friction pad 51 and the second friction pad 52 are arranged on both sides of the brake disc 201 along the axial direction of the brake disc 201. The first clamp 31, the first friction pad 51, the brake disc 201, the second friction pad 52 and the second clamp 32 are arranged sequentially along the axial direction of the brake disc 201. The connecting bridge 33 is arranged on one side of the brake disc 201 along the radial direction of the brake disc 201 and is used to fix the first clamp 31 and the second clamp 32.

[0086] In one embodiment, the first clamp 31 includes a receiving groove 311 for receiving a piston 10. One of the inner circumferential surface of the receiving groove 311 and the outer circumferential surface of the piston 10 includes a protrusion, and the other includes a groove. The radial protrusion of the piston 10 is used to engage with the groove to restrict rotation of the piston 10 within the receiving groove 311.

[0087] Please see Figure 4 , Figure 4 This illustration shows the internal structure of the caliper 30 in an electromechanical braking device 100 provided in one embodiment of this application.

[0088] In one embodiment, the inner circumferential surface of the receiving groove 311 includes a protrusion 3111, and the outer circumferential surface of the piston 10 includes a groove 15. The protrusion 3111 is embedded in the groove 15 radially into the piston 10, thereby abutting against the piston 10 circumferentially. The piston 10 only slides axially along the brake disc 201 within the receiving groove 311, and the contact posture between the piston 10 and the first friction plate 51 remains stable. That is, the radial engagement between the receiving groove 311 and the piston 10 restricts the circumferential rotation of the piston 10, thereby ensuring that the angle and shape of the contact surfaces between the piston 10 and the first friction plate 51 tend to be consistent during the sliding process within the first clamp 31.

[0089] In one embodiment, the receiving groove 311 is used to receive the lead screw nut 60. The nut 61 in the lead screw nut 60 is sleeved on the outer peripheral surface of the lead screw 62 and meshes with the lead screw 62. The nut 61 is also arranged along the axial direction of the brake disc 201 on the side of the piston 10 away from the first friction plate 51. The lead screw 62 is used to receive the drive rotation and drive the nut 61 to slide along the axial direction of the brake disc 201. The nut 61 is used to drive the piston 10 to push the first friction plate 51.

[0090] In this embodiment, the first clamp 31 accommodates the lead screw nut 60 through the receiving groove 311, and the groove wall of the receiving groove 311 abuts against the nut 61 and the piston 10 to form a sliding connection. The electromechanical braking device 100 has a relatively compact structure, and the lead screw 62 of the lead screw nut 60 can be driven and drive the piston 10 to push the first friction plate 51 through the nut 61.

[0091] In one implementation, the first clamp body 31 includes a mounting surface 312, which is axially opposite to the first friction plate 51 along the brake disc 201. The mounting surface 312 is used to fix a brake motor 20 and a reducer 40. The brake motor 20 drives the lead screw nut 60 and drives the piston 10 through the reducer 40.

[0092] In this embodiment, the brake motor 20 and the reducer 40 are fixed along the axial direction of the brake disc 201 to the side of the first caliper 31 opposite to the mounting surface 312 of the second caliper 32. The reducer 40 passes through the mounting surface 312 and is connected to the lead screw nut 60 for transmission. The brake motor 20 and the reducer 40 do not occupy the internal space of the caliper 30, which is beneficial for the arrangement of the brake motor 20 and the reducer 40.

[0093] For the electromechanical braking device 100 of this application, the piston 10 along the axial direction of the brake disc 201 includes two opposing ends, one end facing the first friction plate 51 and the other end facing the lead screw nut 60. In the embodiment of this application, the piston 10 is defined to include an opposing first end 11 and a second end 12 along the axial direction of the brake disc 201. The first end 11 is used to face the first friction plate 51, and the second end 12 is used to receive the drive of the lead screw nut 60 and push the first end 11 into contact with the first friction plate 51 to achieve braking.

[0094] Wherein, when the first end 11 of the piston 10 along the axial direction of the brake disc 201 is used to contact the first friction plate 51, there is a gap 13 between the first end 11 and the first friction plate 51. The opening of the gap 13 faces the connecting bridge 33 of the electromechanical braking device 100. The connecting bridge 33 is used to connect the portions of the electromechanical braking device 100 arranged on both sides of the brake disc 201 along the axial direction of the brake disc 201.

[0095] Please refer to the above. Figure 5 , Figure 5 This diagram illustrates the structure of the piston 10 in contact with the first friction plate 51 in an electromechanical braking device 100 provided in one embodiment of this application.

[0096] The piston 10 receives a drive and pushes the first friction pad 51 into contact with the brake disc 201 through its first end 11 to achieve braking. Along the direction in which the brake disc 201 and the connecting bridge 33 are arranged, the first end 11 includes two opposing edges. One edge is positioned between the connecting bridge 33 and the other edge. This edge is configured as the edge 111 closest to the connecting bridge 33, and the other edge is configured as the edge 112 furthest from the connecting bridge 33. The distance between the edge 111 closest to the brake disc 201 along the axial direction and the first friction pad 51 is greater than the minimum distance between the first end 11 and the first friction pad 51.

[0097] The electromechanical braking device 100 provided in this application is fixedly connected to the portions of the electromechanical braking device 100 arranged on both sides of the brake disc 201 via a connecting bridge 33. The electromechanical braking device 100 has an overall U-shaped structure. During the process of the piston 10 pushing the first friction pad 51 to contact the brake disc 201 and brake, the electromechanical braking device 100 provided in this application adjusts the force on the first friction pad 51 through the gap 13 between the piston 10 and the first friction pad 51.

[0098] Specifically, during braking, the first friction pad 51 is subjected to the reverse pressure of the brake disc 201, which causes the opening of the U-shaped structure of the electromechanical braking device 100 to increase. Because the gap between the piston 10 and the nearest edge 111 of the connecting bridge 33 is large, it can counteract the deformation of the U-shaped electromechanical braking device 100, thereby improving the force on the first friction pad 51 to reduce uneven wear, improving the reliability of the electromechanical braking device 100 and extending its service life.

[0099] In one embodiment, the first end 11 is a plane, and the space between the first end 11 and the first friction piece 51 is used to form a gap 13.

[0100] In this implementation, the first end 11 along the axial direction of the brake disc 201 is arranged opposite to the first friction plate 51 via a plane, and the plane of the first end 11 is inclined relative to the first friction plate 51. The gap 13 between the plane of the first end 11 along the axial direction of the brake disc 201 and the first friction plate 51 gradually decreases from the connecting bridge 33 toward the brake disc 201. As the piston 10 moves toward the brake disc 201, the edge 112 of the first end 11 furthest from the connecting bridge 33 first contacts the first friction plate 51, and the pressure of the part of the first end 11 near the connecting bridge 33 in contact with the first friction plate 51 gradually decreases, thereby improving the deformation of the U-shaped electromechanical braking device 100 and making the force on the first friction plate 51 more uniform.

[0101] In one embodiment, the first friction pad 51 along the axial direction of the brake disc 201 includes a first contact surface 511 facing the piston 10. A first end 11 and the first contact surface 511 are both planes, and the plane containing the first end 11 intersects with the plane containing the first contact surface 511. The distance between the nearest edge 111 and the first contact surface 511 along the axial direction of the brake disc 201 is greater than the distance between the farthest edge 112 and the first contact surface 511. Along the direction in which the brake disc 201 and the connecting bridge 33 are arranged, the distance between the first end 11 and the first contact surface 511 along the axial direction of the brake disc 201 gradually increases from the brake disc 201 toward the connecting bridge 33. That is, along the axial direction of the brake disc 201, the nearest edge 111, the farthest edge 112, and the first contact surface 511 are arranged sequentially, and the distance between the first end 11 and the first contact surface 511 along the axial direction of the brake disc 201 gradually increases from the farthest edge 112 toward the nearest edge 111.

[0102] The electromechanical braking device 100 provided in this application is formed by a U-shaped caliper 30 by a first caliper 31 and a second caliper 32 fixedly connected by a connecting bridge 33. Braking is achieved by a piston 10 slidably connected to the first caliper 31 pushing the first friction pad 51 to contact the brake disc 201. Along the axial direction of the brake disc 201, the distance between the piston 10 and the first end 11 of the first friction pad 51 varies. The distance between the piston 10 and the edge 111 closest to the connecting bridge 33 is larger, while the distance between the piston 10 and the first friction pad 51 is smaller when avoiding the closest edge 111, thus creating a greater holding pressure to push the first friction pad 51 to brake the brake disc 201.

[0103] During braking, the bending moment generated when the first friction pad 51 and the second friction pad 52 contact the brake disc 201 causes the U-shaped caliper 30 to deform, increasing the opening of the caliper 30. The pressure of the piston 10 at its closest edge 111 contacting the first friction pad 51 is relatively small, which can offset part of the deformation of the U-shaped caliper 30. This improves the uneven wear phenomenon between the first friction pad 51 and the second friction pad 52 and the brake disc 201, enhancing the reliability of the electromechanical braking device 100 and extending its service life.

[0104] In one embodiment, the included angle of the gap 13 is greater than 0 degrees and less than or equal to 0.5 degrees. That is, the included angle between the first end 11 and the first contact surface 511 is greater than 0 degrees and less than or equal to 0.5 degrees.

[0105] In this embodiment, the included angle of the gap 13 matches the deformation angle formed by the increased opening of the U-shaped electromechanical braking device 100 during braking, thereby increasing the contact area between the plane of the first end 11 and the first friction plate 51 during braking and improving the uneven wear phenomenon of the first friction plate 51. The first end 11 and the first contact surface 511 are arranged opposite each other along the axial direction of the brake disc 201, and the edge 112 of the first end 11, which is furthest away, is used to abut against the first contact surface 511 first during braking. By limiting the inclination angle between the first end 11 and the first contact surface 511, the force on the first friction plate 51 can be improved while ensuring reliable contact between the piston 10 and the first friction plate 51.

[0106] In one embodiment, the included angle of the gap 13 is equal to 0.3 degrees. That is, the included angle between the first end 11 and the first contact surface 511 is equal to 0.3 degrees.

[0107] In one embodiment, the first end 11 includes a first plane 113 and a second plane 114. Along the direction in which the brake disc 201 and the connecting bridge 33 are arranged, the first plane 113 is located between the second plane 114 and the connecting bridge 33. The space between the first plane 113 and the first friction pad 51 forms a gap 13, the angle of which is greater than 0 degrees and less than or equal to 0.5 degrees. The second plane 114 is arranged parallel to the first friction pad 51 along the axial direction of the brake disc 201.

[0108] Please see Figure 6 and Figure 7 , Figure 6 This illustration shows a structural diagram of the caliper 30 in an electromechanical braking device 100 provided in one embodiment of this application. Figure 7 This diagram illustrates the structure of the piston 10 in contact with the first friction plate 51 in an electromechanical braking device 100 provided in one embodiment of this application.

[0109] In this embodiment, the first end 11 along the axial direction of the brake disc 201 is arranged opposite to the first friction plate 51 via two planes. One plane, the second plane 114, is parallel to the first friction plate 51 along the axial direction of the brake disc 201, thereby increasing the contact area between the first end 11 and the first friction plate 51. The other plane, the first plane 113, is inclined relative to the first friction plate 51. The gap 13 between the first plane 113 and the first friction plate 51 along the axial direction of the brake disc 201 gradually decreases from the connecting bridge 33 toward the brake disc 201. As the piston 10 moves toward the brake disc 201, the second plane 114 of the first end 11 first contacts the first friction plate 51, and the pressure of the part of the first end 11 near the connecting bridge 33 in contact with the first friction plate 51 gradually decreases from the first plane 113, thereby improving the deformation of the U-shaped electromechanical braking device 100 and making the force on the first friction plate 51 more uniform.

[0110] In this embodiment, the included angle of the gap 13 between the first plane 113 and the first friction plate 51 matches the deformation angle formed by the increased opening of the U-shaped electromechanical braking device 100 during braking, thereby making the contact area between the first plane 113 at the first end 11 and the first friction plate 51 larger during braking, thus improving the uneven wear phenomenon of the first friction plate 51.

[0111] In this embodiment, the first end 11 along the direction in which the brake disc 201 and the connecting bridge 33 are arranged includes two connected planar regions. One planar region is arranged between the other planar region and the connecting bridge 33. Along the axial direction of the brake disc 201, the distance between the one planar region and the first friction pad 51 gradually increases from the brake disc 201 toward the connecting bridge 33. The other planar region is parallel to the first contact surface 511 of the first friction pad 51. In this embodiment, one planar region is the first plane 113, and the other planar region is the second plane 114. The connecting bridge 33, the first plane 113, and the second plane 114 are arranged sequentially along the direction in which the brake disc 201 and the connecting bridge 33 are arranged.

[0112] Along the arrangement direction of the brake disc 201 and the connecting bridge 33, the second plane 114 is spaced apart from the nearest edge 111. During braking, the second plane 114 first abuts against the first contact surface 511. The contact area between the first end 11 and the first contact surface 511 is larger. By limiting the tilt angle between the first plane 113 and the first contact surface 511, the pressure at the nearest edge 111 can be reduced while ensuring reliable contact between the piston and the first friction plate 51. This improves the deformation of the U-shaped caliper 30 and makes the force on the first friction plate 51 more uniform.

[0113] In one embodiment, along the direction in which the connecting bridge 33 and the brake disc 201 are arranged, the lengths of the first plane 113 and the second plane 114 are equal. That is, the first plane 113 and the second plane 114 each occupy half the area of ​​the first end 11 of the piston 10. Thus, along the direction in which the connecting bridge 33 and the brake disc 201 are arranged, half of the gap between the first end 11 and the first friction plate 51 is zero, and the other half gradually increases towards the connecting bridge 33.

[0114] In one embodiment, the planar shape of the first end 11 is axially symmetrical, and the axis of symmetry of the first end 11 extends along the arrangement direction of the connecting bridge 33 and the brake disc 201. That is, along the arrangement direction perpendicular to the brake disc 201 and the connecting bridge 33, the first end 11 is axially symmetrical with respect to the radius of the brake disc 201.

[0115] In this embodiment, the first end 11 is axially symmetrical in the direction perpendicular to the arrangement of the brake disc 201 and the connecting bridge 33, which makes the thrust of the piston 10 on the first friction plate 51 more uniform in the direction perpendicular to the arrangement of the brake disc 201 and the connecting bridge 33, thereby reducing the uneven wear of the first friction plate 51 and the second friction plate 52.

[0116] In one embodiment, the first contact surface 511 of the first friction pad 51 along the axial direction of the brake disc 201 toward the piston 10 is perpendicular to the axis of the brake disc 201.

[0117] In this embodiment, without changing the shape of the first friction plate 51, the electromechanical braking device 100 achieves the change of spacing through the first end 11 of the tilting piston 10, which can maintain the compatibility of the first friction plate 51 and facilitate the assembly and maintenance of the electromechanical braking device 100.

[0118] In one implementation, the length direction of the first friction pad 51 is perpendicular to the arrangement direction of the brake disc 201 and the connecting bridge 33, thereby increasing the contact area between the first friction pad 51 and the brake disc 201 to ensure reliable braking.

[0119] In one embodiment, the first end 11 includes a notch 14 that extends radially from the outer peripheral surface of the piston 10 toward the center of the piston 10. The sidewall 141 of the notch 14 extends axially toward the first friction plate 51 along the brake disc 201. The space between the sidewall 141 and the first friction plate 51 forms a gap 13.

[0120] Please see Figure 8 and Figure 9 , Figure 8 This illustration shows a structural diagram of the caliper 30 in an electromechanical braking device 100 provided in one embodiment of this application. Figure 9 This diagram illustrates the structure of the piston 10 in contact with the first friction plate 51 in an electromechanical braking device 100 provided in one embodiment of this application.

[0121] In this embodiment, a notch 14 is provided at the position of the first end 11 near the connecting bridge 33 to form a gap 13, so that the first end 11 is spaced apart from the first friction plate 51 along the axial direction of the brake disc 201 at the edge position closest to the connecting bridge 33. As the piston 10 moves toward the brake disc 201, the position of the first end 11 away from the connecting bridge 33 contacts the first friction plate 51 first, reducing the pressure of the first end 11 contacting the first friction plate 51 at the position of the first end 11 near the connecting bridge 33, thereby improving the deformation of the U-shaped electromechanical braking device 100 and making the force on the first friction plate 51 more uniform.

[0122] In another description, along the axial direction of the brake disc 201, the piston 10 includes a sidewall 141 facing a notch 14 toward the first friction pad 51. The sidewall 141 of the notch 14 includes an axial protrusion 142 extending toward the first friction pad 51. Along the direction in which the brake disc 201 and the connecting bridge 33 are arranged, the sidewall 141 of the notch 14 includes an edge 111 closest to the connecting bridge, and the axial protrusion 142 is spaced apart from the closest edge 111. That is, the piston 10 is used to receive actuation and push the first friction pad 51 into contact with the brake disc 201 through the axial protrusion 142 to achieve braking. The distance between the axial protrusion 142 and the connecting bridge 33 along the radial direction of the brake disc 201 is greater than the distance between the sidewall 141 of the notch 14 and the connecting bridge 33.

[0123] In this embodiment, the piston 10 includes a sidewall 141 facing a notch 14 towards the first friction plate 51, and the sidewall 141 of the notch 14 includes an axial protrusion 142. In this embodiment, the piston 10 pushes the first friction plate 51 through the axial protrusion 142.

[0124] The electromechanical braking device 100 provided in this application is formed by a U-shaped caliper 30 by a first caliper body 31 and a second caliper body 32 fixedly connected by a connecting bridge 33. Braking is achieved by a piston 10 slidably connected to the first caliper body 31 pushing a first friction pad 51 to contact the brake disc 201. Along the axial direction of the brake disc 201, the piston 10 pushes the first friction pad 51 towards its first end 11. The first end 11 exposes at least the area of ​​the sidewall 141 of the notch 14 of the piston 10 near the connecting bridge 33, i.e., the edges 111 closest to the axial protrusions 142 and the sidewall 141 of the notch 14 are spaced apart. The bending moment formed when the first friction pad 51 and the second friction pad 52 contact the brake disc 201 is farther than that of the connecting bridge 33, which can counteract the deformation trend of the U-shaped caliper 30 opening increasing. The electromechanical braking device 100 provided in the second aspect of this application can also improve the uneven wear phenomenon formed between the first friction plate 51 and the second friction plate 52 and the brake disc 201, thereby improving the reliability of the electromechanical braking device 100 and extending its service life.

[0125] In one embodiment, the planar shape of the notch 14 is annular, and the center of the notch 14 coincides with the center of the piston 10.

[0126] Please see Figure 10 , Figure 10 This illustration shows a schematic diagram of the structure of the piston 10 in an electromechanical braking device 100 provided in one embodiment of this application.

[0127] In this embodiment, the surface of the first end 11 facing the first friction plate 51 forms a circle, and the center of the circle coincides with the center of the piston 10. The contact area between the first end 11 and the first friction plate 51 is relatively large, which can better push the first friction plate 51 to contact the brake disc 201 and reduce the phenomenon of uneven wear.

[0128] That is, the planar shape of the axial protrusion 142 is circular, and the center of the circle of the axial protrusion 142 coincides with the center of the side wall 141 of the notch 14. The diameter of the circle of the axial protrusion 142 is smaller than the diameter of the side wall 141 of the notch 14. The circular shape of the axial protrusion 142 is easy to process and makes the thrust of the piston 10 on the first friction plate 51 relatively uniform in all directions.

[0129] In one embodiment, the first end 11 includes a central groove 115 that receives the center of the piston 10, and the groove of the central groove 115 faces the first friction plate 51 along the axial direction of the brake disc 201.

[0130] In this embodiment, the first end 11 avoids the geometric center of the piston 10 through the central groove 115, so that the thrust of the first end 11 on the first friction plate 51 along the radial direction of the brake disc 201 is more evenly distributed, which can eliminate the central wear phenomenon when the first end 11 pushes the first friction plate 51 to contact the brake disc 201.

[0131] In one embodiment, the planar shape of the central groove 115 is circular, the center of the central groove 115 coincides with the center of the piston 10, and the diameter of the central groove 115 is greater than or equal to the radius of the piston 10.

[0132] Please see Figure 11 , Figure 11 This illustration shows a schematic diagram of the structure of the piston 10 in an electromechanical braking device 100 provided in one embodiment of this application.

[0133] In this embodiment, the first end 11 is provided with a notch 14 near the connecting bridge 33 and a central groove 115, which can make the thrust of the first end 11 on the first friction plate 51 more uniform, and reduce the pressure of the first end 11 near the connecting bridge 33 through the notch 14 during braking, thereby counteracting the deformation effect of the U-shaped electromechanical braking device 100.

[0134] Therefore, the planar shape of the axial protrusion 142 is annular, and the center of the annulus of the axial protrusion 142 coincides with the center of the sidewall 141 of the notch 14, wherein the outer diameter of the annulus of the axial protrusion 142 is smaller than the diameter of the sidewall 141 of the notch 14. The annular shape of the axial protrusion 142 is easy to process and makes the thrust of the piston 10 on the first friction plate 51 relatively uniform in all directions.

[0135] In one embodiment, the inner diameter of the annulus of the axial protrusion 142 is greater than or equal to the radius of the sidewall 141 of the notch 14. That is, the inner diameter of the annulus of the axial protrusion 142 is greater than or equal to the radius of the first end 11.

[0136] In this embodiment, the inner diameter of the annular ring of the axial protrusion 142 is relatively large, resulting in relatively low pressure on the central region of the first friction plate 51 and relatively high pressure on the edge region of the first friction plate 51. The larger pressure distribution area of ​​the first friction plate 51 can mitigate the uneven wear caused by the axial protrusion 142 on the first and second friction plates 51.

[0137] In one embodiment, the planar shape of the notch 14 is arc-shaped, and the length of the notch 14 along the direction in which the connecting bridge 33 and the brake disc 201 are arranged is greater than or equal to 1 / 4 of the diameter of the piston 10 and less than or equal to 1 / 2 of the diameter of the piston 10.

[0138] Please see Figure 12 and Figure 13 , Figure 12 This illustration shows a schematic diagram of the structure of the piston 10 in an electromechanical braking device 100 provided in one embodiment of this application; Figure 13 This illustration shows a schematic diagram of the structure of the piston 10 in an electromechanical braking device 100 provided in one embodiment of this application.

[0139] In this embodiment, an arc-shaped notch 14 is formed on the surface of the first end 11 facing the first friction plate 51. The arc-shaped notch 14 is used to reduce the pressure transmitted from the first end 11 to the first friction plate 51 near the connecting bridge 33. By limiting the length of the arc-shaped notch 14, it can be ensured that the contact force between the first end 11 and the first friction plate 51 during braking can counteract the deformation effect of the U-shaped electromechanical braking device 100.

[0140] In one embodiment, the outer diameter of the annular ring of the axial protrusion 142 is equal to the diameter of the sidewall 141 of the notch 14, that is, the outer diameter of the annular ring of the axial protrusion 142 is equal to the radius of the first end 11. The annular ring of the axial protrusion 142 includes a notch 122, the planar shape of the notch 14 is arc-shaped, and the notch 122 is arranged on the side of the axial protrusion 142 facing the connecting bridge 33 along the direction of the brake disc 201 and the connecting bridge 33.

[0141] In the illustrated embodiment, the first end 11 also includes a central groove 115, which is circular. By providing a notch 14 on the side of the axial protrusion 142 near the connecting bridge 33 to form an exposed area of ​​the first end 11 on the side near the connecting bridge 33, i.e., forming a structure in which the axial protrusion 142 and the nearest edge 111 are spaced apart, the uneven wear phenomenon is improved and the machining of the axial protrusion 142 is facilitated.

[0142] In one embodiment, along the direction in which the brake disc 201 and the connecting bridge 33 are arranged, the length of the notch 122 is greater than or equal to 1 / 4 of the diameter of the sidewall 141 of the notch 14, and less than or equal to 1 / 2 of the diameter of the sidewall 141 of the notch 14. That is, the length of the notch 122 is greater than or equal to 1 / 4 of the diameter of the first end 11, and less than or equal to 1 / 2 of the diameter of the first end 11.

[0143] In this embodiment, the length of the notch 122 defines the distance between the axial protrusion 142 and the nearest edge 111 of the sidewall 141 of the notch 14. By defining this distance, the axial protrusion 142 is guaranteed to counteract the deformation effect of the U-shaped caliper 30.

[0144] In one embodiment, the planar shape of the notch 14 is arc-shaped, and the first end 11 includes another notch 14a. Along the direction of the connection bridge 33 and the brake disc 201, the other notch 14a and the first notch 14 are located on both sides of the center of the piston 10. The central groove 115 is used to connect the first notch 14 and the other notch 14a.

[0145] Please see Figure 14 , Figure 14 This illustration shows a schematic diagram of the structure of the piston 10 in an electromechanical braking device 100 provided in one embodiment of this application.

[0146] In this embodiment, the central groove 115 extends along the direction in which the connecting bridge 33 and the brake disc 201 are arranged. The planar shape of the first end 11 is divided into two spaced regions 1421 by the central groove 115 and two notches 14, and the two regions 1421 are spaced apart along the direction perpendicular to the arrangement of the connecting bridge 33 and the brake disc 201. The thrust of the first end 11 on the first friction plate 51 reduces the phenomenon of center wear and makes the distribution more uniform along the direction perpendicular to the arrangement of the connecting bridge 33 and the brake disc 201.

[0147] In one embodiment, the planar shape of another notch 14a is arc-shaped, and along the direction perpendicular to the arrangement of the connecting bridge 33 and the brake disc 201, the width of the central groove 115 is smaller than the width of one notch 14 and smaller than the width of the other notch 14a.

[0148] In this embodiment, the distance between the two regions 1421 is relatively large, which makes the pressure distribution between the first friction plate 51 and the brake disc 201 more uniform. The larger width of the two notches 14 facilitates the processing of the two regions 1421 of the first end 11.

[0149] Thus, the planar shape of the axial protrusion 142 includes two regions 1421, which are located on both sides of the geometric center of the sidewall 141 of the notch 14, along the direction perpendicular to the arrangement of the brake disc 201 and the connecting bridge 33.

[0150] In this embodiment, the axial protrusion 142 passes through the geometric center of the sidewall 141 of the clearance notch 14, which can eliminate the center wear phenomenon when the piston 10 pushes the first friction plate 51 to contact the brake disc 201. This makes the thrust of the piston 10 on the first friction plate 51 along the radial direction of the brake disc 201 and perpendicular to the arrangement direction of the brake disc 201 and the connecting bridge 33 more uniform, thereby reducing the wear phenomenon of the first friction plate 51 and the second friction plate 52.

[0151] In one embodiment, along the radial direction of the brake disc 201 and perpendicular to the arrangement direction of the brake disc 201 and the connecting bridge 33, the side of each of the two regions 1421 opposite to the other region 1421 extends to the edge of the piston 10.

[0152] In this embodiment, along the radial direction of the brake disc 201 and perpendicular to the arrangement direction of the brake disc 201 and the connecting bridge 33, the two regions 1421 of the axial protrusion 142 extend in opposite directions to increase the overall width of the axial protrusion 142. This can make the thrust distribution of the piston 10 on the first friction plate 51 wider along this direction, thereby improving the force on the first friction plate 51.

[0153] In one embodiment, along the direction perpendicular to the arrangement of the connecting bridge 33 and the brake disc 201, the width of the central groove 115 is greater than or equal to 1 / 4 of the diameter of the piston 10 and less than or equal to 1 / 2 of the diameter of the piston 10.

[0154] In this embodiment, the distance between the two regions 1421 of the first end 11 is less than or equal to the sum of the lengths of the two regions 1421, so that the length of each region 1421 is kept within a certain range, ensuring a more uniform pressure distribution between the first friction plate 51 and the brake disc 201.

[0155] Therefore, along the direction perpendicular to the arrangement of the brake disc 201 and the connecting bridge 33, the distance between the two regions 1421 is greater than the length of each region 1421. Along the direction perpendicular to the arrangement of the brake disc 201 and the connecting bridge 33, the distance between the two regions 1421 is less than or equal to the sum of the lengths of the two regions 1421.

[0156] In this embodiment, the distance between the two regions 1421 is larger, resulting in a more uniform pressure distribution between the first friction plate 51 and the brake disc 201. This avoids uneven wear caused by the first end 11 on the first friction plate 51 and the second friction plate 52. The distance between the two regions 1421 is less than or equal to the sum of the lengths of the two regions 1421, ensuring that the length of each region 1421 is within a certain range, thus guaranteeing a more uniform pressure distribution between the first friction plate 51 and the brake disc 201.

[0157] In one embodiment, along the direction in which the brake disc 201 and the connecting bridge 33 are arranged, one notch 14 and another notch 14a are axially symmetrical with respect to the geometric center of the first surface.

[0158] In this embodiment, by setting the two notches 14 to be symmetrical in shape, the two spaced regions 1421 are also axially symmetrical in the direction of the brake disc 201 and the connecting bridge 33, which further makes the thrust of the piston 10 in this direction more uniform, thereby reducing the uneven wear phenomenon of the first friction plate 51.

[0159] That is, along the direction in which the brake disc 201 and the connecting bridge 33 are arranged, each of the two regions 1421 is axially symmetrical with respect to the geometric center of the first end 11. By setting each region 1421 in the axial protrusion 142 to also be axially symmetrical along the direction in which the brake disc 201 and the connecting bridge 33 are arranged, the thrust of the piston 10 along this direction is further made more uniform, thereby reducing the uneven wear of the first friction plate 51 and the second friction plate 52.

[0160] In one embodiment, along the direction in which the brake disc 201 and the connecting bridge 33 are arranged, the distance between the axial protrusion 142 and the first friction pad 51 along the axial direction of the brake disc 201 gradually increases from the brake disc 201 toward the connecting bridge 33.

[0161] Please see Figure 15 , Figure 15 This illustration shows a schematic diagram of the structure of the piston 10 in an electromechanical braking device 100 provided in one embodiment of this application.

[0162] In this embodiment, the first end 11 remains a planar structure, and the plane of the first end 11 is inclined relative to the first friction plate 51. As a result, the distance between the axial protrusion 142 and the first friction plate 51 gradually increases along the axial direction of the brake disc 201. This structure can further mitigate the bending moment generated when the first friction plate 51 and the second friction plate 52 contact the brake disc 201, thereby counteracting the deformation tendency of the U-shaped caliper 30 and reducing uneven wear.

[0163] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of protection of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. An electromechanical braking device, characterized in that, The electromechanical braking device includes friction pads and a piston arranged at intervals. The piston is used to receive a drive from the brake motor of the electromechanical braking device and push the friction pads into contact with the brake disc to achieve braking, wherein: When the end of the piston is in contact with the friction pad along the axial direction of the brake disc, a gap is included between the end of the piston and the friction pad, the opening of the gap facing the connecting bridge of the electromechanical braking device, the connecting bridge being used to connect the portions of the electromechanical braking device arranged on both sides of the brake disc along the axial direction of the brake disc.

2. The electromechanical braking device according to claim 1, characterized in that, The end of the piston is a plane, and the space between the end of the piston and the friction plate when they come into contact forms the gap.

3. The electromechanical braking device according to claim 2, characterized in that, The included angle of the gap is greater than 0 degrees and less than or equal to 0.5 degrees.

4. The electromechanical braking device according to claim 1, characterized in that, The piston end includes a first plane and a second plane, wherein, along the direction in which the brake disc and the connecting bridge are arranged, the first plane is located between the second plane and the connecting bridge, wherein: The space between the first plane and the friction plate is used to form the gap, and the included angle of the gap is greater than 0 degrees and less than or equal to 0.5 degrees. The second plane is arranged parallel to the friction pad along the axial direction of the brake disc.

5. The electromechanical braking device according to claim 1, characterized in that, The piston has a notch at its end, which extends radially from the outer circumferential surface of the piston toward the center of the piston. The sidewall of the notch extends axially toward the friction plate along the brake disc, and the space between the sidewall and the friction plate forms the gap.

6. The electromechanical braking device according to claim 5, characterized in that, The notch has a circular ring shape, and the center of the notch coincides with the center of the piston.

7. The electromechanical braking device according to claim 5, characterized in that, The notch has a circular arc shape in planar shape. Along the direction in which the connecting bridge and the brake disc are arranged, the length of the notch is greater than or equal to 1 / 4 of the diameter of the piston and less than or equal to 1 / 2 of the diameter of the piston.

8. The electromechanical braking device according to any one of claims 5-7, characterized in that, The piston has a central groove at its end that receives the center of the piston, and the groove opening of the central groove faces the friction plate along the axial direction of the brake disc.

9. The electromechanical braking device according to claim 8, characterized in that, The central groove has a circular planar shape, and its center coincides with the center of the piston. The diameter of the central groove is greater than or equal to the radius of the piston.

10. The electromechanical braking device according to claim 8, characterized in that, The notch has a circular arc shape in plan. The end of the piston includes another notch. Along the direction of the connection bridge and the brake disc, the other notch and the first notch are located on opposite sides of the center of the piston. The central groove is used to connect the first notch and the other notch.

11. The electromechanical braking device according to claim 10, characterized in that, The other notch has an arc shape in planar shape. Along the direction perpendicular to the arrangement of the connecting bridge and the brake disc, the width of the central groove is smaller than the width of the first notch and smaller than the width of the other notch.

12. The electromechanical braking device according to claim 10, characterized in that, Along a direction perpendicular to the arrangement of the connecting bridge and the brake disc, the width of the central groove is greater than or equal to 1 / 4 of the piston diameter and less than or equal to 1 / 2 of the piston diameter.

13. The electromechanical braking device according to claim 1, characterized in that, The planar shape of the piston end is axially symmetrical, and the axis of symmetry of the piston end extends along the arrangement direction of the connecting bridge and the brake disc.

14. The electromechanical braking device according to claim 1, characterized in that, The electromechanical braking device includes a caliper, the caliper including a receiving groove for receiving and slidingly connecting the piston, wherein: Along the radial direction of the piston, one of the outer peripheral surfaces of the piston and the inner peripheral surface of the receiving groove includes a protrusion, and the other of the outer peripheral surfaces of the piston and the receiving groove includes a groove, the protrusion being used to fit into the groove to restrict the piston from rotating within the receiving groove.

15. A vehicle, characterized in that, The vehicle includes wheels and an electromechanical braking device as described in any one of claims 1-14, the electromechanical braking device being fixed to the vehicle frame and used to brake the brake discs of the wheels.

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