Electromechanical brake device and two-wheeled vehicle

Abstract

The application discloses an electromechanical brake device and a two-wheeled vehicle, and relates to the field of vehicles. The electromechanical brake device comprises a base, a piston assembly, a driving motor, a speed reduction mechanism, a first brake piece and a second brake piece. The base is provided with a piston cavity. The piston assembly comprises a piston barrel arranged in the piston cavity and a screw sleeve arranged in the piston barrel, and the outer circumferential surface of the screw sleeve is threadedly matched with the inner circumferential surface of the piston barrel. In the application, the torque of the driving motor can be transmitted to the screw sleeve through the speed reduction mechanism, the rotation of the screw sleeve can drive the piston barrel to move in a preset direction, so that the second brake piece is driven to move close to or away from the first brake piece in the preset direction, so as to realize braking. The electromechanical brake device disclosed by the application has compact structure and good reliability. The two-wheeled vehicle provided by the application comprises a wheel, a brake pad and the above-mentioned electromechanical brake device.

Description

Technical Field

[0001] This application relates to the field of vehicles, and more specifically, to an electromechanical braking device and a two-wheeled vehicle. Background Technology

[0002] The braking systems currently used in motorcycles and e-bikes are primarily electro-hydraulic brakes (EHB). However, hydraulic brakes are susceptible to brake fluid leakage, which can lead to a drop in hydraulic pressure, weakened braking force, or even brake failure. Air bubbles can form in the brake fluid; these compressible bubbles can cause a softer brake feel and delayed braking. At low temperatures, the viscosity of the brake fluid increases, affecting the hydraulic transmission response speed. Electro-mechanical brakes (EMB), on the other hand, do not pose a risk of leakage and offer superior handling. However, due to the limited space in two-wheeled vehicles, current EMB brake systems used in these vehicles suffer from insufficient compactness and reliability. Summary of the Invention

[0003] The purpose of this application is to provide an electromechanical braking device and a two-wheeled vehicle, wherein the electromechanical braking device has a compact structure and high reliability.

[0004] The embodiments of this application can be implemented as follows: In a first aspect, this application provides an electromechanical braking device, comprising: A base, on which a piston chamber is provided; The piston assembly includes a piston cylinder disposed in a piston chamber and a threaded sleeve disposed in the piston cylinder. The outer circumferential surface of the threaded sleeve is threadedly engaged with the inner circumferential surface of the piston cylinder. The piston cylinder is slidably engaged with a base. The threaded sleeve can rotate relative to the base to drive the piston cylinder to move relative to the base in a preset direction. The preset direction is the axial direction of the piston cylinder. A drive motor is mounted on the base and is used to drive the screw sleeve to rotate. The reduction mechanism is located inside the piston chamber, and the drive motor is connected to the screw sleeve through the reduction mechanism; A first braking component and a second braking component are arranged in a preset direction. The first braking component is fixedly connected to the base, and the second braking component is connected to the piston cylinder.

[0005] In an optional embodiment, the piston chamber has an opening at one end in a preset direction, and the second braking element is opposite to the opening; the piston chamber has a through hole at the other end in the preset direction, the through hole is connected to the outside of the piston chamber, the drive motor is opposite to the through hole, and the through hole is used to realize the transmission connection between the drive motor and the reduction mechanism.

[0006] In an optional embodiment, the reduction mechanism includes an input shaft and an output shaft; the input shaft of the reduction mechanism is inserted into a through hole and is connected to the drive motor; the output shaft of the reduction mechanism is connected to a threaded sleeve.

[0007] In an optional embodiment, the reduction mechanism includes a housing and at least two planetary gear sets. The planetary gear sets are disposed inside the housing and include a sun gear, planet gears, and a planet carrier. The inner circumferential surface of the housing is provided with teeth. The planet gears are rotatably connected to the planet carrier and mesh with the teeth of the housing. The sun gear meshes with the planet gears. Each planetary gear set is connected in sequence for transmission. In the transmission direction, the sun gear of the uppermost planetary gear set is connected to the input shaft of the reduction mechanism, and the sun gears of the other planetary gear sets are set on the planet carriers of the planetary gear sets above them. The planet carrier of the lowermost planetary gear set is connected to the output shaft of the reduction mechanism, and the output shaft of the reduction mechanism extends from the housing and is connected to the threaded sleeve.

[0008] In an optional embodiment, at least a portion of the deceleration mechanism is embedded in a threaded sleeve, the threaded sleeve including a sleeve and a connecting portion connected within the sleeve, the outer circumferential side of the sleeve being provided with an external thread, the external thread of the sleeve engaging with the internal thread of the piston cylinder; the output shaft of the deceleration mechanism is connected to the connecting portion.

[0009] In an optional embodiment, a needle roller bearing is provided between the housing and the connecting part.

[0010] In an optional embodiment, a retaining ring is provided on the output shaft of the reduction mechanism to prevent the threaded sleeve from moving along the output shaft.

[0011] In an optional embodiment, a sealing ring is provided between the outer peripheral surface of the piston cylinder and the inner wall of the piston chamber.

[0012] In an optional embodiment, one of the second braking member and the piston cylinder is provided with a limit pin, and the other is provided with a limit hole. The limit pin and the limit hole are engaged to prevent the piston cylinder from rotating relative to the second braking member.

[0013] Secondly, this application provides a two-wheeled vehicle, including a wheel, brake pads, and an electromechanical braking device according to any of the foregoing embodiments, wherein the brake pads are coaxially and fixedly connected to the wheel, and a portion of the brake pads is located between a first braking element and a second braking element.

[0014] The beneficial effects of the electromechanical braking device and the two-wheeled vehicle provided in this application include: The electromechanical braking device of this application includes a base, a piston assembly, a drive motor, a reduction mechanism, a first braking element, and a second braking element. A piston chamber is provided on the base. The piston assembly includes a piston cylinder disposed within the piston chamber and a threaded sleeve disposed within the piston cylinder. The outer circumferential surface of the threaded sleeve is threadedly engaged with the inner circumferential surface of the piston cylinder. The piston cylinder is slidably engaged with the base. The threaded sleeve can rotate relative to the base to drive the piston cylinder to move relative to the base in a preset direction, the preset direction being the axial direction of the piston cylinder. The drive motor is disposed on the base and is used to drive the threaded sleeve to rotate. The reduction mechanism is disposed within the piston chamber, and the drive motor is driven by the threaded sleeve through the reduction mechanism. The first braking element and the second braking element are arranged in the preset direction. The first braking element is fixedly connected to the base, and the second braking element is connected to the piston cylinder. In this application, the torque of the drive motor can be transmitted to the threaded sleeve through the reduction mechanism. The rotation of the threaded sleeve can drive the piston cylinder to move in the preset direction, thereby causing the second braking element to move closer to or further away from the first braking element in the preset direction. When the second braking element approaches the first braking element, it can clamp the brake pads to achieve braking; when the second braking element moves away from the first braking element, the braking can be released. By setting a piston chamber on the base, the reduction mechanism and piston assembly are all set in the piston chamber, which not only makes the structure compact but also protects the piston assembly and reduction mechanism, resulting in good reliability.

[0015] The two-wheeled vehicle provided in this application embodiment includes wheels, brake pads, and the aforementioned electromechanical braking device, and features good braking control and high reliability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an electromechanical braking device in one embodiment of this application; Figure 2 This is an exploded view of an electromechanical braking device in one embodiment of this application; Figure 3 This is an exploded view of one embodiment of the present application, omitting the base; Figure 4 This is a cross-sectional view of an electromechanical braking device in one embodiment of this application; Figure 5 This is a cross-sectional view of the piston assembly and the reduction mechanism in one embodiment of this application; Figure 6 This is an exploded view of the deceleration mechanism in one embodiment of this application; Figure 7 This is a schematic diagram of the piston assembly, the first brake member, and the second brake member in one embodiment of this application.

[0018] Icons: 100-Base; 110-Mounting part; 111-Piston chamber; 112-Sealing ring; 120-Support part; 130-Control unit; 200-Drive motor; 300-Piston assembly; 310-Sleeve; 311-Sleeve; 312-Connecting part; 320-Piston cylinder; 330-Needle roller bearing; 400-Reduction mechanism; 410-Housing housing; 420-Input shaft; 430-Output shaft; 431-Snap ring; 440-Planetary gear set; 441-Sun gear; 442-Planet gear; 443-Planet carrier; 450-End cover; 460-Bearing sleeve; 510-First braking element; 520-Second braking element; 521-Limit pin; 530-Slide rail. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this application, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, they are only for the convenience of describing 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, and therefore should not be construed as a limitation of this application.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0025] In related technologies, electro-hydraulic braking systems are commonly used in two-wheeled vehicles. However, electro-hydraulic braking systems have stringent sealing requirements. Leaks in the pipes, joints, or cylinders can lead to a drop in oil pressure, weakening of braking force, or even brake failure. Air bubbles can form in the brake fluid; these compressible bubbles can soften the brake pedal feel and cause sluggish braking. Low temperatures increase the viscosity of the brake fluid, affecting the hydraulic transmission response speed. Furthermore, hydraulic lines are often made of rigid or flexible hoses, which are easily damaged by impacts, compression, or aging; line breakage can result in a loss of braking force. Applying electromechanical braking systems to two-wheeled vehicles also presents challenges due to insufficient structural compactness and poor reliability.

[0026] Therefore, this application provides an electromechanical braking device, whose base accommodates and supports the piston assembly and the reduction mechanism, and the drive motor is connected to the piston assembly through the reduction mechanism. The overall structure is compact and the braking performance is reliable.

[0027] Figure 1 This is a schematic diagram of an electromechanical braking device in one embodiment of this application; Figure 2 This is an exploded view of an electromechanical braking device in one embodiment of this application; Figure 3 This is an exploded view of one embodiment of this application, omitting the base 100. (See attached image.) Figures 1 to 3 As shown, the electromechanical braking device provided in this application includes a base 100, a drive motor 200, a piston assembly 300, a reduction mechanism 400, a first braking element 510, and a second braking element 520. A piston chamber 111 is provided on the base 100, and at least a portion of the piston assembly 300 is disposed in the piston chamber 111. The drive motor 200 is disposed on the base 100 and is connected to the piston assembly 300 (specifically, the threaded sleeve 310 of the piston assembly 300) via the reduction mechanism 400, for driving the piston assembly 300 to move and achieve braking. The base 100 serves to accommodate and protect the piston assembly 300 and the reduction mechanism 400; the base 100 also supports and fixes the drive motor 200. The drive motor 200 can be fixed to the base 100 using bolts or other fasteners.

[0028] In this embodiment, the electromechanical braking device further includes a control unit 130, which is electrically connected to the drive motor 200 and used to control the drive motor 200 to perform actions. In other embodiments, the control unit 130 may not be provided in the electromechanical braking device, and the control unit 130 may be located in other parts of the two-wheeled vehicle.

[0029] In this embodiment, a portion of the piston assembly 300 (specifically, the piston cylinder 320) can move relative to the base 100 in a predetermined direction. One end of the piston chamber 111 in the predetermined direction is open, allowing the piston assembly 300 to connect with the second brake member 520 outside the piston chamber 111. The other end of the piston chamber 111 in the predetermined direction has a through hole, which communicates with the outside of the piston chamber 111. The drive motor 200 is opposite to the through hole, which enables a transmission connection between the drive motor 200 and the reduction mechanism 400.

[0030] In this embodiment, the first braking member 510 and the second braking member 520 are arranged in a preset direction, and the first braking member 510 is fixedly connected to the base 100. The second braking member 520 is opposite to the opening of the piston chamber 111 and is connected to the piston assembly 300. Therefore, the piston assembly 300 can drive the second braking member 520 to approach or move away from the first braking member 510 to achieve braking or release of braking.

[0031] In this application, the piston assembly 300 includes a piston cylinder 320 disposed within a piston chamber 111 and a threaded sleeve 310 disposed within the piston cylinder 320. The outer circumferential surface of the threaded sleeve 310 is threadedly engaged with the inner circumferential surface of the piston cylinder 320. The piston cylinder 320 is slidably engaged with a base 100, and the threaded sleeve 310 can rotate relative to the base 100 to drive the piston cylinder 320 to move relative to the base 100 in a preset direction, which is the axial direction of the piston cylinder 320.

[0032] In this embodiment, the piston assembly 300 converts the torque transmitted from the transmission assembly into linear motion. Specifically, the torque output by the drive motor 200 can be transmitted to the sleeve 310 of the piston assembly 300 through the reduction mechanism 400, thereby driving the sleeve 310 to rotate. While the sleeve 310 rotates, the piston cylinder 320 is configured to not rotate relative to the base 100. Therefore, the piston cylinder 320 can only move linearly along a preset direction under the drive of the sleeve 310. Thus, the piston cylinder 320 can drive the second braking element 520 to translate in the preset direction, achieving braking. In this embodiment, the depth direction of the piston cavity 111 is parallel to the preset direction. The base 100 has a mounting portion 110 and a support portion 120. The piston cavity 111 is disposed in the mounting portion 110, and the support portion 120 is opposite to the opening of the piston cavity 111. The first braking element 510 is disposed on the side of the support portion 120 near the opening of the piston cavity 111. The base 100 is an integral structure, giving it better reliability.

[0033] Figure 4 This is a cross-sectional view of an electromechanical braking device in one embodiment of this application; Figure 5 This is a cross-sectional view of the piston assembly 300 and the reduction mechanism 400 in one embodiment of this application; Figure 6This is an exploded view of the deceleration mechanism 400 in one embodiment of this application. Figures 4 to 6 As shown in this embodiment, the reduction mechanism 400 includes an input shaft 420 and an output shaft 430. The input shaft 420 of the reduction mechanism 400 is inserted into the through hole of the piston chamber 111 and is connected to the drive motor 200. The output shaft 430 of the reduction mechanism 400 is connected to the threaded sleeve 310. Specifically, the input shaft 420 of the reduction mechanism 400 is inserted into the through hole of the piston chamber 111 and is connected to the output shaft of the drive motor 200.

[0034] Optionally, the reduction mechanism 400 further includes a housing 410 and at least two planetary gear sets 440. The planetary gear sets 440 are sequentially connected, thus enabling multi-stage reduction and amplifying the torque output by the drive motor 200 to ensure sufficient braking force. In this embodiment, the planetary gear set 440 includes a sun gear 441, planet gears 442, and a planet carrier 443. The inner circumferential surface of the housing 410 is provided with teeth. The planet gears 442 are rotatably connected to the planet carrier 443 and mesh with the teeth of the housing 410. The sun gear 441 meshes with the planet gears 442. In this embodiment, the planet gears 442 of each planetary gear set 440 mesh with the inner side of the housing 410, and the housing 410 can act as a gear ring. Multiple planetary gear sets 440 are arranged in a predetermined direction. In the transmission direction, the sun gear 441 of the uppermost planetary gear set 440 is connected to the input shaft 420 of the reduction mechanism 400, and the sun gears 441 of the other planetary gear sets 440 are mounted on the planet carriers 443 of the previous-level planetary gear set 440; the planet carrier 443 of the lowermost planetary gear set 440 is connected to the output shaft 430 of the reduction mechanism 400, and the output shaft 430 of the reduction mechanism 400 extends from the housing 410 and is connected to the threaded sleeve 310. Optionally, the housing 410 can be fixedly connected to the base 100 by fasteners. When the input shaft 420 of the reduction mechanism 400 rotates, each sun gear 441 rotates, each planet gear 442 revolves around the sun gear 441 and drives the planet carrier 443 to rotate, and the planet carrier 443 of the lowermost planetary gear set 440 drives the output shaft 430 to rotate.

[0035] In this embodiment, an end cap 450 is provided at one end of the housing 410 near the input shaft 420. The cavity formed by the end cap 450 and the housing 410 is used to accommodate the planetary gear set 440, so that the planetary gear set 440 can be better protected. Furthermore, a bearing sleeve 460 is fitted onto the input shaft 420. The bearing sleeve 460 is used to reduce the frictional resistance between the input shaft 420 and the through hole of the base 100, and also to limit the input shaft 420 radially to keep it stable.

[0036] In this embodiment, the reduction mechanism 400 includes three planetary gear sets 440, each of which has three planetary gears 442. In other optional embodiments, the number of planetary gear sets 440 can be increased or decreased as needed.

[0037] In this embodiment, a portion of the piston cylinder 320 can extend from the opening of the piston chamber 111 to connect to the second brake member 520; alternatively, the piston cylinder 320 can be completely located within the piston chamber 111 and connected to the second brake member 520 via a connecting structure.

[0038] At least a portion of the reduction mechanism 400 is embedded in the threaded sleeve 310. The threaded sleeve 310 includes a sleeve 311 and a connecting portion 312 connected within the sleeve 311. The outer circumference of the sleeve 311 is provided with an external thread, which mates with the internal thread of the piston cylinder 320. The output shaft 430 of the reduction mechanism 400 is connected to the connecting portion 312. Specifically, the output shaft 430 can be connected to the connecting portion 312 via a key connection, thereby enabling the output shaft 430 and the sleeve 311 to rotate synchronously.

[0039] Optionally, a needle roller bearing 330 is provided between the housing 410 and the connecting portion 312. In this embodiment, the needle roller bearing 330 is sleeved on the output shaft 430. The needle roller bearing 330 abuts against the housing 410 on one side in a predetermined direction and against the connecting portion 312 on the other side in the predetermined direction. By providing a needle roller bearing, the frictional resistance between the threaded sleeve 310 and the stationary housing 410 is reduced when the output shaft 430 drives the threaded sleeve 310 to rotate.

[0040] Optionally, a retaining ring 431 is provided on the output shaft 430 of the reduction mechanism 400. The retaining ring 431 is used to prevent the threaded sleeve 310 from moving along the output shaft 430, thereby achieving the positioning of the threaded sleeve 310 on the output shaft 430. Specifically, the retaining ring 431 can abut against the side of the connecting portion 312 of the threaded sleeve 310 away from the housing 410, restricting the connecting portion 312 between the needle roller bearing 330 and the retaining ring 431.

[0041] Furthermore, a sealing ring 112 is provided between the outer peripheral surface of the piston cylinder 320 and the inner wall of the piston cavity 111. The sealing ring 112 is located at the end of the piston cavity 111 near the opening. By providing the sealing ring 112, water can be prevented from entering the piston cavity 111, thereby providing better protection for the piston assembly 300 and the reduction mechanism 400. In this embodiment, a groove is formed on the inner wall of the piston cavity 111, and the sealing ring 112 is embedded in the groove; in other embodiments, a groove may also be provided on the outer periphery of the piston cylinder 320, and the sealing ring 112 may be embedded in the groove of the piston cylinder 320.

[0042] Figure 7This is a schematic diagram of the piston assembly 300 and the first brake member 510 and the second brake member 520 in one embodiment of this application. Optionally, one of the second brake member 520 and the piston cylinder 320 is provided with a limiting pin 521, and the other is provided with a limiting hole. The limiting pin 521 and the limiting hole are inserted into each other to prevent the piston cylinder 320 from rotating relative to the second brake member 520. Figure 7 As shown, in this embodiment, a limiting pin 521 is provided on the second braking member 520, and the limiting pin 521 is inserted into the limiting hole of the piston cylinder 320. Optionally, the limiting hole is eccentrically arranged relative to the piston cylinder 320, or the cross-section of the limiting pin 521 is non-circular, so that the piston cylinder 320 will not rotate relative to the second braking member 520.

[0043] Furthermore, a slide rail 530 is provided on the base 100, extending along a preset direction, and the second braking member 520 slides in cooperation with the slide rail 530. The function of the slide rail 530 is to guide the second braking member 520, improve the stability of the second braking member 520 during translational movement, and prevent it from deflecting. Optionally, there may be two or more slide rails 530. Optionally, one end of the slide rail 530 is connected to the mounting part 110, and the other end is connected to the support part 120. Thanks to the limiting effect of the slide rail 530, the second braking member 520 can only translate in the preset direction and cannot rotate; with the limiting effect of the upper limit pin 521, the piston cylinder 320 cannot rotate with the screw sleeve 310, and can only translate in the preset direction under the drive of the screw sleeve 310.

[0044] This application also provides a two-wheeled vehicle (not shown in the figure), including wheels, brake pads, and the electromechanical braking device described in the above embodiment. The brake pads are coaxially fixedly connected to the wheels, and a portion of the brake pads is located between the first braking member 510 and the second braking member 520. When the drive motor 200 drives the second braking member 520 to move, thereby causing the second braking member 520 to clamp the brake pads with the first braking member 510, braking is achieved. The two-wheeled vehicle can be a motorcycle, an electric-assisted bicycle, or the like.

[0045] The braking principle of the electromechanical braking device provided in this embodiment is as follows: When braking is required, the drive motor 200 outputs torque, driving the input shaft 420 of the reduction mechanism 400 to rotate. After the input shaft 420 is reduced by a series of planetary gear sets 440, the torque is output from the output shaft 430 of the reduction mechanism 400. The output shaft 430 drives the threaded sleeve 310 to rotate, while the piston cylinder 320 cannot rotate due to the limiting action of the limiting pin 521. However, due to the threaded fit between the piston cylinder 320 and the threaded sleeve 310, the rotation of the threaded sleeve 310 will drive the piston cylinder 320 to translate in a preset direction. The translation of the piston cylinder 320 directly drives the second braking element 520 to move closer to the first braking element 510. When the first braking element 510 and the second braking element 520 clamp the brake pads, braking is achieved.

[0046] The electromechanical braking device provided in this application has the following advantages: 1. High scalability: It can easily integrate autonomous driving-related functions (such as automatic emergency braking and adaptive cruise control), supports drive-by-wire operation, and is adapted to the future development of intelligent driving. 2. It works more directly with the electric drive system, allowing for precise adjustment of braking force distribution, maximizing kinetic energy recovery, and increasing the range of electric motorcycles; 3. By eliminating components such as the master cylinder and brake lines, the risk of malfunctions such as leakage and corrosion is reduced, eliminating the need for regular brake fluid replacement or addition, making long-term maintenance more worry-free; 4. No hydraulic line lag; the drive motor 200 transmits momentum through the transmission components, resulting in faster response speed and a response time that can be shortened to the millisecond level. It can also precisely control the braking force of each wheel and is more efficient when adapted to electronic systems such as ABS. 5. The reduction mechanism 400 is integrated into the piston chamber 111, which saves more space and improves the shortcomings of the overall vehicle layout. 6. The system adopts a multi-stage planetary gear set 440 reduction method, and the number of planetary gear sets 440 can be selected according to the needs to adjust the braking force.

[0047] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. An electromechanical braking device, characterized in that, include: A base (100) is provided with a piston chamber (111). The piston assembly (300) includes a piston cylinder (320) disposed in the piston chamber (111) and a threaded sleeve (310) disposed in the piston cylinder (320). The outer peripheral surface of the threaded sleeve (310) is threadedly engaged with the inner peripheral surface of the piston cylinder (320). The piston cylinder (320) is slidably engaged with the base (100). The threaded sleeve (310) can rotate relative to the base (100) to drive the piston cylinder (320) to move relative to the base (100) in a preset direction. The preset direction is the axial direction of the piston cylinder (320). A drive motor (200) is disposed on the base (100), and the drive motor (200) is used to drive the screw sleeve (310) to rotate; A reduction mechanism (400) is disposed in the piston chamber (111), and the drive motor (200) is connected to the screw sleeve (310) through the reduction mechanism (400); A first braking element (510) and a second braking element (520) are arranged in the preset direction. The first braking element (510) is fixedly connected to the base (100), and the second braking element (520) is connected to the piston cylinder (320).

2. The electromechanical braking device according to claim 1, characterized in that, The piston chamber (111) has an opening at one end in the preset direction, and the second brake (520) is opposite to the opening; the piston chamber (111) has a through hole at the other end in the preset direction, the through hole is connected to the outside of the piston chamber (111), the drive motor (200) is opposite to the through hole, and the through hole is used to realize the transmission connection between the drive motor (200) and the reduction mechanism (400).

3. The electromechanical braking device according to claim 2, characterized in that, The deceleration mechanism (400) includes an input shaft (420) and an output shaft (430); the input shaft (420) of the deceleration mechanism (400) is inserted into the through hole and is connected to the drive motor (200) for transmission; the output shaft (430) of the deceleration mechanism (400) is connected to the threaded sleeve (310).

4. The electromechanical braking device according to claim 3, characterized in that, The reduction mechanism (400) includes a housing (410) and at least two planetary gear sets (440). The planetary gear sets (440) are disposed inside the housing (410). The planetary gear sets (440) include a sun gear (441), planet gears (442), and a planet carrier (443). The inner circumferential surface of the housing (410) is provided with teeth. The planet gears (442) are rotatably connected to the planet carrier (443) and mesh with the teeth of the housing (410). The sun gear (441) meshes with the planet gears (442). Each of the planetary gear sets (440) is connected in sequence for transmission. In the transmission direction, the sun gear (441) of the uppermost planetary gear set (440) is connected to the input shaft (420) of the reduction mechanism (400), and the sun gears (441) of the other planetary gear sets (440) are disposed on the planet carriers (443) of the planetary gear sets (440) above the previous level. The planet carriers (443) of the lowermost planetary gear set (440) are connected to the output shaft (430) of the reduction mechanism (400). The output shaft (430) of the reduction mechanism (400) extends from the housing (410) and is connected to the threaded sleeve (310).

5. The electromechanical braking device according to claim 4, characterized in that, At least a portion of the deceleration mechanism (400) is embedded in the threaded sleeve (310). The threaded sleeve (310) includes a sleeve (311) and a connecting portion (312) connected inside the sleeve (311). The outer circumference of the sleeve (311) is provided with an external thread, and the external thread of the sleeve (311) is engaged with the internal thread of the piston cylinder (320). The output shaft (430) of the deceleration mechanism (400) is connected to the connecting portion (312).

6. The electromechanical braking device according to claim 5, characterized in that, A needle roller bearing (330) is provided between the outer shell (410) and the connecting part (312).

7. The electromechanical braking device according to claim 4, characterized in that, A retaining ring (431) is provided on the output shaft (430) of the deceleration mechanism (400), and the retaining ring (431) is used to prevent the threaded sleeve (310) from moving along the output shaft (430).

8. The electromechanical braking device according to any one of claims 1-7, characterized in that, A sealing ring (112) is provided between the outer peripheral surface of the piston cylinder (320) and the inner wall of the piston cavity (111).

9. The electromechanical braking device according to any one of claims 1-7, characterized in that, The second braking member (520) and the piston cylinder (320) are provided with a limiting pin (521) and a limiting hole, respectively. The limiting pin (521) and the limiting hole are inserted into each other to prevent the piston cylinder (320) from rotating relative to the second braking member (520).

10. A two-wheeled vehicle, characterized in that, The device includes a wheel, brake pads, and an electromechanical braking device according to any one of claims 1-9, wherein the brake pads are coaxially fixedly connected to the wheel, and a portion of the brake pads is located between the first braking member (510) and the second braking member (520).

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