Motor-driven brake

Abstract

The invention discloses a motor-driven brake, which relates to the technical field of automobile braking systems and comprises a braking device, a driving device and a fixing device, the brake device comprises a brake disc, an elastic reset piece, brake calipers and a brake pad. The brake disc is fixedly sleeved on the driving half shaft and is in anti-torsion connection with the driving half shaft; the brake calipers are installed on one side of the fixing device and can be arranged outside the brake disc in a sleeving mode in the radial direction of the drive half shaft. The brake pad is movably mounted in the brake calipers in the axial direction of the driving half shaft; the elastic reset piece is installed in the brake calipers and used for providing elastic acting force for the brake pad to move in the direction away from the brake disc. The driving device is installed on the brake calipers and used for driving the brake pad and / or the brake calipers to move so that the brake pad can make contact with the brake disc. According to the design, radial disassembly and assembly can be achieved, meanwhile, the driving layout is simplified, and braking response sensitivity and later maintenance convenience are improved.

Description

Technical Field

[0001] This application relates to the field of automotive braking system technology, and more particularly to an electric motor driven brake. Background Technology

[0002] In traditional motor vehicle braking systems, disc brakes are typically mounted directly to the steering knuckle or wheel hub unit in the form of calipers. This direct mounting method makes the brake assembly part of the unsprung mass. This increased unsprung mass significantly negatively impacts the vehicle's suspension response characteristics, reducing its ability to follow road undulations and consequently degrading ride comfort and handling stability. Furthermore, the already limited space inside the wheel hub is further squeezed by the direct mounting of the brakes. This severely restricts the compact design and weight reduction goals of the brakes themselves, making it difficult to use superior materials and structures to reduce weight and size. Moreover, in new powertrain architectures such as electric vehicles, the brakes easily interfere with the layout of components like wheel-side drive motors and reducers, limiting the integration and layout flexibility of the overall vehicle powertrain.

[0003] Furthermore, while traditional hydraulic braking systems are widely used, they have inherent limitations in terms of response speed and braking accuracy. Pressure build-up and transmission in hydraulic lines require time and are susceptible to factors such as temperature and hydraulic oil characteristics, leading to delayed braking response and insufficient braking force control precision. While common electromechanical braking (EMB) systems offer improvements in response speed and control precision, current technologies still primarily locate their actuators at the wheel ends, failing to fundamentally address the adverse effects of the brake as unsprung mass on vehicle dynamics.

[0004] Therefore, how to effectively reduce unsprung mass, improve braking response speed and accuracy, and optimize wheel hub space layout has become a key issue that urgently needs to be addressed in the design of motor vehicle braking systems. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a motor-driven brake that can be arranged on the shaft and radially disassembled, simplifying the drive layout, effectively reducing unsprung mass, and improving braking response speed and accuracy.

[0006] To achieve the above-mentioned technical objectives, this application provides a motor-driven brake, including a braking device, a driving device, and a fixing device;

[0007] The braking device includes a brake disc, a resilient reset member, a brake caliper, and brake pads;

[0008] The brake disc is sleeved on the drive half shaft and is torsionally connected to the drive half shaft.

[0009] The brake caliper is mounted on one side of the fixing device and can be fitted onto the brake disc in the radial direction of the drive half shaft;

[0010] The brake pad is movably mounted in the brake caliper along the axial direction of the drive half-shaft;

[0011] The elastic reset member is installed in the brake caliper and is used to provide an elastic force for the brake pad to move away from the brake disc;

[0012] The drive device is mounted on the brake caliper and is used to drive the brake pads and / or the brake caliper to move so that the brake pads contact the brake disc.

[0013] Furthermore, the brake caliper is floatingly mounted on one side of the fixed device along the axial direction of the drive half-shaft;

[0014] The brake pads are at least two, wherein at least one brake pad is an active brake pad and at least one brake pad is a driven brake pad;

[0015] The active brake pad and the driven brake pad are distributed on both sides of the brake disc along the axial direction of the drive half shaft;

[0016] The driving device has a first driving end and a second driving end;

[0017] The first driving end contacts the active brake pad and is used to drive the active brake pad to move closer to the brake disc;

[0018] The second drive end contacts the floating caliper and is used to drive the brake caliper to move closer to the fixed device while the first drive end drives the active brake pad, so as to synchronously drive the driven brake pad to move closer to the brake disc.

[0019] Furthermore, the braking device also includes a force transmission plate;

[0020] The force transmission plate is movably mounted in the brake caliper along the axial direction of the drive half shaft and is located on the side of the brake disc closer to the drive device.

[0021] The first driving end is in contact with the force transmission plate;

[0022] The inner peripheral wall of the brake caliper is provided with a force transmission groove;

[0023] The force transmission plate is provided with a force transmission slide key that slides in conjunction with the force transmission slide groove.

[0024] Furthermore, the brake caliper has a driven groove on its inner sidewall away from the drive device;

[0025] The driven brake pad is movably mounted in the driven groove along the axial direction of the drive half shaft;

[0026] The force transmission plate has an active groove on the side wall away from the driving device.

[0027] The active brake pad is movably mounted in the active groove along the axial direction of the drive half-shaft.

[0028] Furthermore, the brake caliper has a driven guide groove on its inner sidewall away from the drive device, which communicates with the driven groove;

[0029] The driven brake pad is provided with a driven sliding key that cooperates with the driven guide groove;

[0030] The force transmission plate has an active guide groove on the side wall away from the driving device that communicates with the active groove;

[0031] The active braking pad is provided with an active sliding key that cooperates with the active guide groove.

[0032] Furthermore, the elastic reset member is a U-shaped elastic member, and its two ends are respectively connected to the active brake pad and the driven brake pad.

[0033] Furthermore, the driving device includes a driving housing, a driving motor, a transmission assembly, a force transmission ring, a driving threaded component, and a driven threaded component;

[0034] The drive housing is fixedly connected to the brake caliper;

[0035] The active threaded component and the driven threaded component are mounted on the drive housing, and both are provided with a hollow cavity through which the drive half shaft passes.

[0036] The active threaded component and the driven threaded component are nested together and threadedly connected.

[0037] The drive motor is mounted on the drive housing, and its drive end is connected to the active threaded component through the transmission assembly, for driving the driven threaded component to move along the axial direction of the drive half shaft by rotating the active threaded component.

[0038] The force transmission ring is sleeved outside the active threaded component, and one end is provided with a first flange that is rotatably connected to the axial end of the active threaded component facing away from the driven threaded component, and the other end is provided with a second flange that contacts the inner wall of the brake caliper near the drive device.

[0039] The end of the driven threaded member that is away from the driving threaded member forms the first driving end;

[0040] The first flange forms the second driving end.

[0041] Furthermore, the drive device also includes a sealing ring;

[0042] The driven threaded component has a third flange that is flush with the first flange at one end away from the driving threaded component;

[0043] The sealing ring is disposed between the second flange and the third flange.

[0044] Furthermore, the fixing device includes a fixing bracket and a floating component;

[0045] The floating component is floatingly mounted on the fixed bracket along the axial direction of the drive half-shaft and is fixedly connected to the brake caliper.

[0046] Furthermore, the floating component includes a support pin and a sliding pin;

[0047] The brake caliper has support holes on both sides of its sidewalls;

[0048] One end of the support pin passes through the support holes on both sides of the brake caliper in sequence and is threadedly connected to the sliding pin;

[0049] The other end of the support pin and the sliding pin clamp and fix the brake caliper.

[0050] The force transmission plate is provided with a clearance hole to avoid the support pin;

[0051] The fixed bracket is provided with a pin hole for the sliding pin to be inserted movably;

[0052] The floating assembly also includes a sealing sleeve;

[0053] The sealing sleeve is fitted onto the sliding pin and contacts the fixed bracket to seal the pin hole.

[0054] As can be seen from the above technical solutions, the motor-driven brake designed in this application has the following beneficial effects:

[0055] 1. The brake in this application is located on the drive half-shaft between the output end of the gearbox, differential, or drive motor and the drive wheel, rather than unsprung components such as wheel hubs / steering knuckles. Therefore, compared with common electromechanical braking (EMB) systems and traditional hydraulic braking systems, it effectively reduces unsprung mass, frees up wheel hub space, improves suspension system response characteristics, and enhances vehicle driving comfort and handling stability.

[0056] 2. The brake caliper is radially mounted on the outside of the brake disc along the drive half shaft, eliminating the need to disassemble the drive half shaft and reducing the difficulty and cost of later maintenance; the drive unit is only laid out on one side, simplifying the drive layout and facilitating the compact and lightweight design of the brake structure.

[0057] 3. Compared with traditional hydraulic braking systems, this application directly drives the brake pads / calipers to move through an electric motor drive device, shortening the power transmission chain, solving the problem of sluggish response in traditional hydraulic braking systems, improving braking response sensitivity and braking force control accuracy, meeting the needs of intelligent connected vehicles for high dynamic response and high precision control, enhancing active safety performance and improving energy recovery efficiency. Attached Figure Description

[0058] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art 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 based on these drawings without creative effort.

[0059] Figure 1 This is a perspective view of a motor-driven brake provided in this application;

[0060] Figure 2 This is a partial three-dimensional view of a motor-driven brake provided in this application;

[0061] Figure 3 This is a cross-sectional view of a brake caliper for a motor-driven brake provided in this application;

[0062] Figure 4 This is a front view of the force transmission plate of a motor-driven brake provided in this application;

[0063] Figure 5 This is a cross-sectional view of a motor-driven brake provided in this application;

[0064] In the diagram: 100, Braking device; 200, Drive device; 300, Fixing device; 400, Drive half-shaft; 11, Brake disc; 12, Brake caliper; 121, Caliper sidewall; 122, Connecting arm; 123, Force transmission groove; 124, Driven groove; 125, Driven guide groove; 126, Support hole; 131, Active brake pad; 132, Driven brake pad; 14, Elastic reset element; 15, Force transmission plate; 151, Force transmission key; 152, Main... 153. Moving groove; 154. Active guide groove; 21. Clearance hole; 22. Drive housing; 23. Drive motor; 24. Transmission assembly; 25. Active threaded component; 26. Driven threaded component; 27. Third flange; 28. Force transmission ring; 29. ​​First flange; 20. Second flange; 21. Bearing component; 22. Sealing ring; 33. Fixed bracket; 34. Pin hole; 35. Floating assembly; 36. Support pin; 37. Sliding pin; 38. Sealing sleeve. Detailed Implementation

[0065] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of this application.

[0066] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0067] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0068] This application discloses a motor-driven brake.

[0069] Please see Figure 1 as well as Figure 2 One embodiment of a motor-driven brake provided in this application includes:

[0070] Braking device 100, driving device 200 and fixing device 300.

[0071] The braking device 100 includes a brake disc 11, a resilient return member 14, a brake caliper 12, and brake pads.

[0072] The brake disc 11 is fixed to the drive half shaft 400 and is torsionally connected to the drive half shaft 400; the brake disc 11 preferably has a ventilated perforated and scribing structure to optimize heat dissipation performance.

[0073] The brake caliper 12 is mounted on one side of the fixing device 300 and can be fitted onto the brake disc 11 in the radial direction of the drive half shaft 400. The brake caliper 12 can be designed to include two caliper sidewalls 121 and several connecting arms 122. The two calipers are arranged in parallel and spaced apart and connected by several connecting arms 122. Both caliper sidewalls 121 are open annular to facilitate installation in the radial direction of the drive half shaft 400 (directly assembled or disassembled to the drive half shaft 400 in the radial direction).

[0074] The brake pads are movably mounted in the brake caliper 12 along the axial direction of the drive half-shaft 400; the elastic reset member 14 is mounted in the brake caliper 12 to provide an elastic force for the brake pads to move away from the brake disc 11, ensuring rapid return to position after the brake is released.

[0075] The drive unit 200 is mounted on the brake caliper 12 and is used to drive the brake pads and / or the brake caliper 12 to move so that the brake pads contact the brake disc 11, thereby achieving braking.

[0076] The motor-driven brake designed in this application has the following beneficial effects:

[0077] 1. The brake of this application is located on the drive half shaft 400 between the output end of the gearbox, differential or drive motor 22 and the drive wheel, rather than unsprung components such as wheel hub / steering knuckle. Therefore, compared with common electromechanical braking (EMB) systems and traditional hydraulic braking systems, it effectively reduces unsprung mass, frees up wheel hub space, improves suspension system response characteristics, and enhances vehicle driving comfort and handling stability.

[0078] 2. The brake caliper 12 is radially mounted on the outside of the brake disc 11 along the drive half shaft 400, without the need to disassemble the drive half shaft 400, reducing the difficulty and cost of later maintenance; the drive unit 200 is only laid out on one side, simplifying the drive layout and facilitating the compact and lightweight design of the brake structure.

[0079] 3. Compared with traditional hydraulic braking systems, this application directly drives the brake pads / calipers to move through the motor drive device 200, shortening the power transmission chain, solving the problem of sluggish response in traditional hydraulic braking systems, improving braking response sensitivity and braking force control accuracy, meeting the needs of intelligent connected vehicles for high dynamic response and high precision control, enhancing active safety performance and improving energy recovery efficiency.

[0080] The above is Embodiment 1 of a motor-driven brake provided in this application. The following is Embodiment 2 of a motor-driven brake provided in this application. Please refer to the following for details. Figures 1 to 5 .

[0081] Based on the solution of Embodiment 1 above:

[0082] Furthermore, the brake caliper 12 is floatingly mounted on one side of the fixed device 300 along the axial direction of the drive half shaft 400. It can be understood that the brake caliper 12 is a floating caliper body.

[0083] like Figure 1 as well as Figure 2 As shown, there are at least two brake pads, of which at least one brake pad is an active brake pad 131 and at least one brake pad is a driven brake pad 132; the active brake pad 131 and the driven brake pad 132 are distributed on both sides of the brake disc 11 along the axial direction of the drive half shaft 400.

[0084] The drive device 200 has a first drive end and a second drive end; the first drive end is in contact with the active brake pad 131 and is used to drive the active brake pad 131 to move towards the brake disc 11; the second drive end is in contact with the floating caliper and is used to drive the brake caliper 12 to move towards the fixed device 300 while the first drive end drives the active brake pad 131, so as to synchronously drive the driven brake pad 132 to move towards the brake disc 11.

[0085] In the above design, when the drive device 200 is working, the first drive end pushes the active brake pad 131 to move towards one side of the brake disc 11, while the second drive end pushes the brake caliper 12 to float towards the fixed device 300 (since the drive device 200 is installed on the brake caliper 12, it moves axially together with the brake caliper 12), so that the driven brake pad 132 moves synchronously towards the other side of the brake disc 11. This allows the active brake pad 131 and the driven brake pad 132 to apply braking force from both sides of the brake disc 11 at the same time, effectively shortening the braking gap, improving braking efficiency and the smoothness of the braking process. At the same time, compared with the traditional fixed caliper single-side drive method, it can make fuller use of the friction area of ​​the brake disc 11 and extend the service life of the brake pads and the brake disc 11.

[0086] The number of brake pads can be varied according to actual needs. For example, four pads can be designed, with two being active brake pads 131 and the other two being driven brake pads 132. There are no specific restrictions.

[0087] By designing the brake pads as a split structure, compared to an integral structure design (such as the force transmission plate 15), it is possible to install and remove them radially without the need for additional openings.

[0088] Furthermore, such as Figure 2 As shown, taking at least two active brake pads 131 as an example, in order to achieve synchronous movement of the two active brake pads 131, the braking device 100 also includes a force transmission plate 15, such as... Figure 4 As shown, the force transmission plate 15 is also in the shape of an open ring to facilitate installation along the radial direction of the drive half shaft 400; the force transmission plate 15 is movably installed in the brake caliper 12 along the axial direction of the drive half shaft 400 and is located on the side of the brake disc 11 near the drive device 200.

[0089] The first driving end contacts the force transmission plate 15; such as Figure 3 As shown, the inner peripheral wall of the brake caliper 12 (specifically, the inner side wall of the connecting arm 122) is provided with a force transmission groove 123; as Figure 4 As shown, the force transmission plate 15 is provided with a force transmission key 151 that slides in cooperation with the force transmission groove 123. The cooperation between the force transmission groove 123 and the force transmission key 151 enables the force transmission plate 15 to slide stably in the axial direction of the drive half shaft 400 within the brake caliper 12, ensuring that the force transmission plate 15 can uniformly and stably transmit the driving force of the first drive end to the active brake pad 131.

[0090] Furthermore, such as Figure 3 As shown, the inner wall of the brake caliper 12 away from the drive device 200 is provided with a driven groove 124; the driven brake pad 132 is movably installed in the driven groove 124 along the axial direction of the drive half shaft 400; the side wall of the force transmission plate 15 away from the drive device 200 is provided with an active groove 152; the active brake pad 131 is movably installed in the active groove 152 along the axial direction of the drive half shaft 400.

[0091] The driven brake pad 132 is fitted into the driven groove 124 and can achieve slight axial displacement to match the brake clearance. Similarly, the active brake pad 131 is fitted into the active groove 152 and can achieve slight axial displacement to match the brake clearance.

[0092] Both the active brake pad 131 and the driven brake pad 132 can be arc-shaped brake pads. The active groove 152 and the driven groove 124 are shapes adapted to the corresponding brake pads so that the active brake pad 131 and the driven brake pad 132 can be stably displaced.

[0093] Furthermore, such as Figure 3 as well as Figure 4 As shown, the active groove 152 and the driven groove 124 can also be open annular grooves. In this case, the active brake pad 131 and the driven brake pad 132 can undergo circumferential displacement in the groove. To avoid circumferential displacement, a driven guide groove 125 communicating with the driven groove 124 can be provided on the inner side wall of the brake caliper 12 away from the drive device 200. The driven brake pad 132 is provided with a driven sliding key (not shown in the figure) that cooperates with the driven guide groove 125. Similarly, the side wall of the force transmission plate 15 away from the drive device 200 is provided with an active guide groove 153 communicating with the active groove 152. The active brake pad 131 is provided with an active sliding key that cooperates with the active guide groove 153.

[0094] The cooperation between the driven guide groove 125 and the driven slide key restricts the circumferential rotation of the driven brake pad 132, ensuring that it can only move stably in the axial direction of the drive half shaft 400. Similarly, the cooperation between the active guide groove 153 and the active slide key can effectively prevent the active brake pad 131 from shifting circumferentially during braking, ensuring the contact accuracy between the brake pad and the brake disc 11, avoiding abnormal braking noise or uneven braking force caused by brake pad misalignment, and further improving the reliability and stability of braking.

[0095] The open annular groove design reduces structural weight compared to the groove design with a matching shape, while providing convenience for installation and disassembly. Of course, it is not limited to the above-mentioned groove design, and those skilled in the art can make changes according to actual needs.

[0096] Furthermore, such as Figure 1 as well as Figure 2 As shown, the elastic reset member 14 is a U-shaped elastic member, and its two ends are respectively connected to the active brake pad 131 and the driven brake pad 132. The active brake pad 131 and the driven brake pad 132 may be provided with insertion holes (not shown in the figure) for the ends of the elastic reset member 14 to be inserted, so as to achieve connection and fixation. Of course, other connection methods are also possible, and there are no specific limitations.

[0097] Furthermore, such as Figure 5 As shown, the structural design of the drive device 200 includes a drive housing 21, a drive motor 22, a transmission assembly 23, a force transmission ring 26, a driving threaded component 24, and a driven threaded component 25.

[0098] The drive housing 21 is fixedly connected to the brake caliper 12; the driving threaded part 24 and the driven threaded part 25 are installed on the drive housing 21, and both are provided with a hollow cavity through which the drive half shaft 400 passes.

[0099] The driving threaded component 24 and the driven threaded component 25 are nested and threaded together. The drive motor 22 is mounted on the drive housing 21, and its drive end is connected to the driving threaded component 24 through the transmission assembly 23. It is used to drive the driven threaded component 25 to move along the axial direction of the drive half-shaft 400 by rotating the driving threaded component 24. The force transmission ring 26 is sleeved on the outside of the driving threaded component 24, and one end is provided with a first flange 261 that is rotatably connected to the axial end of the driving threaded component 24 facing away from the driven threaded component 25. The other end is provided with a second flange 262 that contacts the inner sidewall of the brake caliper 12 near the drive device 200.

[0100] The driven threaded member 25 forms a first driving end at the end away from the driving threaded member 24; the first flange 261 forms a second driving end.

[0101] In the above design, the driving threaded component 24 can be a ball screw, while the driven threaded component 25 can be a ball screw nut. The outer ring of the ball screw nut is threaded with the ball screw, converting the rotational motion of the ball screw into the axial (linear) motion of the ball screw nut. The ball screw nut is in contact with the end face of the force transmission plate 15 to transmit force, and the ball screw is in contact with the caliper side wall 121 near the drive device 200 to transmit force.

[0102] The design of the force transmission ring 26 can both bear the force transmission function and take into account the sealing and protection function; a thrust ball bearing or other bearing component 27 can be installed on the axial end of the outer ring of the active thread component 24 to realize the rotational connection between the first flange 261 and the active thread component 24.

[0103] The transmission component 23 can be a gear set, specifically a two-stage reduction gear set. The drive motor 22 can be a torque motor capable of forward and reverse rotation. The torque output by the drive motor 22 is transmitted to the ball screw through the gear set, driving it to rotate. The ball screw has an integrally formed gear tooth profile that meshes with the gear set.

[0104] When the braking mode is activated, the drive motor 22 outputs torque to drive the active threaded component 24 to rotate. Then, the active threaded component 24 and the driven threaded component 25 cooperate to convert the rotational displacement of the active threaded component 24 into the axial displacement of the driven threaded component 25, thereby causing the force transmission plate 15 to move closer to the brake disc 11 (causing the active brake pad 131 to move closer to the brake disc 11). When the driven threaded component 25 moves closer to the brake disc 11, the fixed force transmission ring 26 moves away from the brake disc 11 relative to the driven threaded component 25, thereby causing the brake caliper 12 to move closer to the fixing device 300 (causing the driven brake pad 132 to move synchronously closer to the brake disc 11), thus achieving bidirectional clamping braking of the brake disc 11.

[0105] When the braking mode is released, the drive motor 22 reverses, causing the active threaded component 24 to reset, while the active brake pad 131 and the driven brake pad 132 are reset under the elastic action of the elastic reset component 14, thus simultaneously resetting the brake caliper 12.

[0106] Furthermore, such as Figure 5 As shown, the drive device 200 also includes a sealing ring 28; the driven threaded member 25 has a third flange 251 flush with the second flange 262 at one end away from the driving threaded member 24; the sealing ring 28 is disposed between the second flange 262 and the third flange 251, and serves a sealing function. The sealing ring 28 is an elastic ring, and can undergo elastic deformation when the third flange 251 moves axially relative to the second flange 262.

[0107] In this application, the drive unit 200 is mounted on the drive half-shaft 400. If it is to be repaired or replaced, the drive half-shaft 400 must be removed first.

[0108] Furthermore, such as Figure 5 As shown, taking the floating installation of the brake caliper 12 as an example, the fixing device 300 is designed to include a fixing bracket 31 and a floating component 32. The floating component 32 is floatingly installed on the fixing bracket 31 along the axial direction of the drive half shaft 400 and is fixedly connected to the brake caliper 12.

[0109] The fixing device 300 is the foundation for connecting the entire brake to the vehicle body. Its fixing bracket 31 can be rigidly connected to the vehicle frame or drive unit housing by bolts without restriction.

[0110] Furthermore, such as Figure 5 As shown, the design of the floating assembly 32 includes a support pin 321 and a sliding pin 322; both side walls of the brake caliper 12 are provided with support holes 126; as Figure 3 As shown, one end of the support pin 321 passes through the support holes 126 on both sides of the brake caliper 12 and is threadedly connected to the sliding pin 322; the other end of the support pin 321 and the sliding pin 322 form a clamping and fixing mechanism for the brake caliper 12; as shown... Figure 4 As shown, the force transmission plate 15 is provided with a clearance hole 154 for the clearance support pin 321; the fixed bracket 31 is provided with a pin hole 311 for the sliding pin 322 to be inserted movably.

[0111] The threaded connection design of the support pin 321 and the sliding pin 322 allows for easy disassembly and assembly of the support pin 321 and the sliding pin 322 with the brake caliper 12, facilitating subsequent maintenance. There can be multiple floating components 32, specifically four, corresponding to multiple support pins 321 and sliding pins 322. The design of multiple floating components 32 provides a more stable guiding effect for the axial floating of the brake caliper 12, enabling the brake caliper 12 to move stably along a preset trajectory.

[0112] Taking the four floating components 32 as an example, the corresponding brake caliper 12 has four support holes 126 on each of its two side walls, the force transmission plate 15 has four clearance holes 154, and the fixed bracket 31 has four corresponding pin holes 311. The specific number can be designed and varied according to actual needs, without limitation.

[0113] The floating assembly 32 also includes a sealing sleeve 323; the sealing sleeve 323 is fitted onto the sliding pin 322, with one end in contact with the fixed bracket 31 and the other end in contact with the stop structure on the brake caliper 12 or the sliding pin 322, for sealing the pin hole 311.

[0114] The working principle of the motor-driven brake in this application is as follows:

[0115] When the drive motor 22 is energized, it drives the active threaded component 24 to rotate via the transmission assembly 23, which in turn pushes the driven threaded component 25 to generate axial movement. The active threaded component 24 transmits the force to the brake caliper 12 through the bearing component 27 and the force transmission ring 26, pushing the brake caliper 12 to slide along the sliding pin 322 in the opposite direction, thereby causing the driven brake pad 132 mounted on it to press against the other side of the brake disc 11, achieving synchronous clamping braking on both sides. When the brake is released, the drive motor 22 reverses, and the brake pad separates from the brake disc 11 under the restoring force of the elastic reset component 14, and all moving parts reset.

[0116] The above provides a detailed description of a motor-driven brake provided in this application. For those skilled in the art, based on the ideas of the embodiments of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A motor-driven brake, characterized in that, It includes a braking device (100), a driving device (200), and a fixing device (300). The braking device (100) includes a brake disc (11), an elastic reset member (14), a brake caliper (12), and brake pads; The brake disc (11) is sleeved on the drive half shaft (400) and is torsionally connected to the drive half shaft (400); The brake caliper (12) is mounted on one side of the fixing device (300) and can be fitted onto the brake disc (11) in the radial direction of the drive half shaft (400); The brake pad is movably mounted in the brake caliper (12) along the axial direction of the drive half-shaft (400); The elastic reset member (14) is installed in the brake caliper (12) and is used to provide an elastic force for the brake pad to move away from the brake disc (11); The drive unit (200) is mounted on the brake caliper (12) and is used to drive the brake pads and / or the brake caliper (12) to move so that the brake pads contact the brake disc (11).

2. The motor-driven brake according to claim 1, characterized in that, The brake caliper (12) is floatingly mounted on one side of the fixing device (300) along the axial direction of the drive half shaft (400); The brake pads are at least two, wherein at least one of the brake pads is an active brake pad (131), and at least one of the brake pads is a driven brake pad (132). The active brake pad (131) and the driven brake pad (132) are distributed on both sides of the brake disc (11) along the axial direction of the drive half shaft (400); The driving device (200) has a first driving end and a second driving end; The first driving end contacts the active brake pad (131) and is used to drive the active brake pad (131) to move closer to the brake disc (11); The second drive end contacts the floating caliper and is used to drive the brake caliper (12) to move closer to the fixed device (300) while the first drive end drives the active brake pad (131), so as to synchronously drive the driven brake pad (132) to move closer to the brake disc (11).

3. A motor-driven brake according to claim 2, characterized in that, The braking device (100) also includes a force transmission plate (15); The force transmission plate (15) is movably mounted in the brake caliper (12) along the axial direction of the drive half shaft (400) and is located on the side of the brake disc (11) close to the drive device (200). The first driving end is in contact with the force transmission plate (15); The inner peripheral wall of the brake caliper (12) is provided with a force transmission groove (123). The force transmission plate (15) is provided with a force transmission slide key (151) that slides in cooperation with the force transmission slide groove (123).

4. A motor-driven brake according to claim 3, characterized in that, The brake caliper (12) has a driven groove (124) on its inner sidewall away from the drive device (200). The driven brake pad (132) is movably mounted in the driven groove (124) along the axial direction of the drive half shaft (400). The force transmission plate (15) has an active groove (152) on the side wall away from the driving device (200). The active brake pad (131) is movably mounted in the active groove (152) along the axial direction of the drive half shaft (400).

5. A motor-driven brake according to claim 4, characterized in that, The brake caliper (12) has a driven guide groove (125) on its inner side wall away from the drive device (200) that communicates with the driven groove (124). The driven brake pad (132) is provided with a driven sliding key that cooperates with the driven guide groove (125); The force transmission plate (15) has an active guide groove (153) that communicates with the active groove (152) on one side wall away from the driving device (200). The active brake pad (131) is provided with an active sliding key that cooperates with the active guide groove (153).

6. A motor-driven brake according to claim 2, characterized in that, The elastic reset member (14) is a U-shaped elastic member, and its two ends are respectively connected to the active brake pad (131) and the driven brake pad (132).

7. A motor-driven brake according to claim 2, characterized in that, The drive device (200) includes a drive housing (21), a drive motor (22), a transmission assembly (23), a force transmission ring (26), a driving threaded component (24), and a driven threaded component (25). The drive housing (21) is fixedly connected to the brake caliper (12); The active threaded component (24) and the driven threaded component (25) are mounted on the drive housing (21), and both are provided with a hollow cavity through which the drive half shaft (400) passes; The active threaded component (24) and the driven threaded component (25) are nested and threaded together; The drive motor (22) is mounted on the drive housing (21), and its drive end is connected to the active threaded part (24) through the transmission assembly (23), for driving the driven threaded part (25) to move along the axial direction of the drive half shaft (400) by driving the active threaded part (24) to rotate. The force transmission ring (26) is sleeved on the outside of the active threaded part (24), and one end is provided with a first flange (261) that is rotatably connected to the axial end of the active threaded part (24) facing away from the driven threaded part (25), and the other end is provided with a second flange (262) that contacts the inner wall of the brake caliper (12) near the drive device (200). The driven threaded member (25) has its end away from the driving threaded member (24) forming the first driving end; The first flange (261) forms the second driving end.

8. A motor-driven brake according to claim 7, characterized in that, The drive unit (200) also includes a sealing ring (28); The driven threaded part (25) has a third flange (251) that is flush with the first flange (261) at one end away from the driving threaded part (24). The sealing ring (28) is disposed between the second flange (262) and the third flange (251).

9. A motor-driven brake according to claim 3, characterized in that, The fixing device (300) includes a fixing bracket (31) and a floating component (32); The floating component (32) is floatingly mounted on the fixed bracket (31) along the axial direction of the drive half shaft (400) and is fixedly connected to the brake caliper (12).

10. A motor-driven brake according to claim 9, characterized in that, The floating component (32) includes a support pin (321) and a sliding pin (322); The brake caliper (12) has support holes (126) on both sides of its side walls. One end of the support pin (321) passes through the support holes (126) on both sides of the brake caliper (12) and is threadedly connected to the sliding pin (322); The other end of the support pin (321) and the sliding pin (322) clamp and fix the brake caliper (12); The force transmission plate (15) is provided with a clearance hole (154) to avoid the support pin (321). The fixed bracket (31) is provided with a pin hole (311) for the sliding pin (322) to be inserted movably; The floating component (32) also includes a sealing sleeve (323); The sealing sleeve (323) is fitted onto the sliding pin (322) and contacts the fixed bracket (31) to seal the pin hole (311).

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