Brake cylinder, brake system, angle module and electric vehicle

Abstract

The invention provides a brake cylinder, a brake system, a corner module and an electric vehicle. The lead screw is rotationally assembled on the retainer, a first gear pair and a first thread pair are arranged on the surface of the lead screw, and a second thread pair and a second gear pair are arranged on the surface of the roller; the rollers surround the lead screws in the circumferential direction of the lead screws, the first thread pairs of the rollers and the second thread pairs of the lead screws are assembled in a driving mode, and the first gear pairs of the rollers and the second gear pairs of the lead screws are assembled in a driving mode. A cylinder body cavity is formed in the cylinder body sleeve, a third thread pair is arranged in the cylinder body cavity, the cylinder body sleeve is assembled outside the retainer, the rollers and the lead screw, and the second thread pairs of the rollers and the third thread pair of the cylinder body sleeve are assembled in a driving mode. The roller screw mechanism is designed for power transmission, the transmission efficiency can be greatly improved, the characteristic of excellent space adaptability is combined, excellent transmission efficiency can be executed in a narrow space in the angle module, and the design requirement of the angle module in the electric vehicle is met.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to brake cylinders, braking systems, corner modules, and electric vehicles. Background Technology

[0002] The rapid development of vehicle electrification and intelligentization has made it difficult for traditional hydraulic braking systems to meet the performance requirements of next-generation vehicles in terms of response speed, control precision, and energy recovery efficiency. Braking systems are gradually transitioning to fully electric electromechanical brakes, which are also regarded as the core actuators for achieving coordinated braking by steer and intelligent driving.

[0003] The main reason why traditional hydraulic braking-dominated systems are difficult to adapt to the needs of vehicle electrification and intelligent transformation is that hydraulic braking relies on pipelines to transmit pressure, has a complex layout and occupies a large space, and cannot be compactly integrated in the limited space of the corner module hub motor, making it difficult to match the requirements of electromechanical brakes for small size and high integration.

[0004] In pursuing smaller size, existing electromechanical brakes often sacrifice performance integrity. For example, cam-type electromechanical brakes are difficult to reconcile with braking transmission efficiency and control precision, making them unsuitable for the integrated requirements of intelligent driving for actuators.

[0005] Therefore, the transmission structure of existing electromechanical brakes has insufficient spatial adaptability. For example, self-amplifying electromechanical brakes using wedge blocks are often too bulky to be integrated into hub motors.

[0006] Therefore, how to construct a small-volume electromechanical brake that can fit into the limited space of the corner module hub motor, and integrate a pressure sensor within the limited volume of the brake to achieve closed-loop control of the brake, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] Therefore, it is necessary to provide a brake cylinder, a braking system, a corner module, and an electric vehicle to address the aforementioned technical problems.

[0008] This application provides a brake cylinder, the brake cylinder comprising:

[0009] cage;

[0010] A lead screw, which is rotatably mounted on the cage, has a first gear pair and a first thread pair provided on its surface;

[0011] The rollers have a second threaded pair and a second gear pair on their surfaces; the number of rollers is configured to be a plurality, the plurality of rollers are rotatably mounted on the cage, and the plurality of rollers surround the lead screw along the circumferential direction of the lead screw; the first threaded pair of the rollers is driven to be mounted with the second threaded pair of the lead screw; the first gear pair of the rollers is driven to be mounted with the second gear pair of the lead screw.

[0012] A cylinder sleeve has a cylinder cavity inside, a cylinder cover is provided at the cavity opening of the cylinder sleeve, a third threaded pair is provided inside the cylinder cavity, the cylinder sleeve is fitted to the outside of the cage, the rollers and the lead screw, and the second threaded pairs of a plurality of the rollers are driven to assemble with the third threaded pair of the cylinder sleeve.

[0013] In one embodiment, the number of first threaded pairs is configured to be one, the number of first gear pairs is configured to be two, and the first threaded pairs are located between the two first gear pairs along the axial direction of the lead screw.

[0014] The number of the second threaded pair is configured to be one, and the number of the second gear pair is configured to be two. The second threaded pair is located between the two second gear pairs along the axial direction of the roller; wherein the two first gear pairs of the roller and the two second gear pairs of the plurality of lead screws are respectively driven and assembled.

[0015] In one embodiment, the first threaded pair has an axial length along the screw greater than the axial length of any one of the first threaded pairs along the screw; and / or,

[0016] The second threaded pair has a greater axial length along the roller than any one of the second threaded pairs along the roller.

[0017] In one embodiment, the brake cylinder includes:

[0018] An input shaft is mounted on the cage and the cylinder cover, and the input shaft is connected to the lead screw drive;

[0019] A retaining ring is assembled to the retainer and is fitted onto the outer periphery of the input shaft;

[0020] A sensor, which is mounted on the outside of the cylinder head.

[0021] In one embodiment, the retainer includes a first end plate and a second end plate, the first end plate and the second end plate having a first pivot hole and a plurality of second pivot holes that cooperate with each other, the plurality of second pivot holes surrounding the first pivot hole;

[0022] The lead screw is rotatably mounted between the first shaft hole of the first end plate and the second end plate along its central axis, and a plurality of rollers are rotatably mounted between a plurality of second shaft holes of the first end plate and the second end plate along their respective central axes, and the central axis of the lead screw and the central axes of the rollers are parallel to each other.

[0023] This application provides a braking system, the braking system comprising:

[0024] A driver, the driver having an output shaft;

[0025] A speed reducer, wherein the input end of the speed reducer is connected to the output shaft;

[0026] The brake cylinder, wherein the lead screw of the brake cylinder is connected to the output end of the reducer via an input shaft;

[0027] The brake caliper is connected to the cylinder sleeve of the brake cylinder.

[0028] In one embodiment, the reducer includes:

[0029] A device housing, wherein an inner cavity is provided inside the device housing;

[0030] A first gear is rotatably mounted in the inner cavity of the housing, and the output shaft of the driver is connected to the first gear;

[0031] The second gear is rotatably assembled in the inner cavity of the housing, and the second gear meshes with the first gear in a driving manner;

[0032] The third gear is rotatably assembled in the inner cavity of the housing, and the third gear is driven to mesh with the second gear;

[0033] The fourth gear is rotatably mounted in the inner cavity of the housing and engages with the third gear. The fourth gear is connected to the lead screw of the brake cylinder via an input shaft.

[0034] In one embodiment, the first gear is rotatably mounted in the inner cavity of the housing via a first bearing sleeve, and a deep groove ball bearing is fitted between the first gear and the first bearing sleeve; and / or,

[0035] The second gear is rotatably mounted in the inner cavity of the housing via a second bearing sleeve, and a deep groove ball bearing is fitted between the second gear and the second bearing sleeve; and / or,

[0036] The third gear is rotatably mounted in the inner cavity of the housing via a third bearing sleeve, and a deep groove ball bearing is fitted between the third gear and the third bearing sleeve; and / or,

[0037] The fourth gear is rotatably assembled in the inner cavity of the housing via a fourth bearing sleeve, and an angular contact ball bearing is assembled between the fourth gear and the fourth bearing sleeve.

[0038] This application provides an angle module, which includes the braking system.

[0039] This application provides an electric vehicle that includes the corner module.

[0040] In the aforementioned brake cylinder, braking system, corner module, and electric vehicle, the brake cylinder of this application constructs a roller screw mechanism using a lead screw, several rollers, and a cylinder sleeve, wherein the cylinder sleeve serves as the nut for linear motion within the roller screw mechanism. Utilizing a roller screw mechanism for power transmission allows for arrangement in confined spaces, meeting the space constraints of corner modules. Furthermore, designing the power transmission as a roller screw mechanism converts rotational motion into linear motion, significantly improving transmission efficiency. Combined with its excellent spatial adaptability, it enables superior transmission efficiency within the limited space of a corner module, fulfilling the design requirements of corner modules in electric vehicles. Attached Figure Description

[0041] Figure 1 A perspective view of a braking system provided in one embodiment of this application.

[0042] Figure 2 For example Figure 1 The diagram shows the internal structure of the reducer in the braking system.

[0043] Figure 3 This is a perspective view of a brake cylinder provided in one embodiment of this application.

[0044] Figure 4 For example Figure 3 The exploded view of the brake cylinder is shown.

[0045] Figure 5 For example Figure 3 The diagram shows a cross-sectional view of the brake cylinder.

[0046] Icon labels:

[0047] 1000, Brake cylinder; 2000, Driver; 3000, Reducer; 4000, Brake caliper;

[0048] 1100, Cage; 1200, Lead Screw; 1300, Roller; 1400, Cylinder Block Sleeve; 1500, Input Shaft; 1600, Retaining Ring; 1700, Sensor; 1800, Cylinder Block Cover;

[0049] 1110, First end plate; 1120, Second end plate;

[0050] 1210, First threaded pair; 1220, First gear pair;

[0051] 1310, Second threaded pair; 1320, Second gear pair;

[0052] 1410, Cylinder cavity; 1420, Third threaded pair;

[0053] 3001, Device housing; 3100, First gear; 3200, Second gear; 3300, Third gear; 3400, Fourth gear. Detailed Implementation

[0054] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0055] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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.

[0056] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0058] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0060] This application provides an electric vehicle, which includes a body and corner modules mounted on the body. The number of corner modules is generally four, with the four corner modules located at the four corners of the body. Two corner modules are located at the front of the body as the two front wheels, and two corner modules are located at the rear of the body as the two rear wheels. Regarding the corner modules provided in this application, each corner module may include a braking system, a drive system, a steering system, and a suspension system. These four systems are distributed within the corner modules and are responsible for functions such as forward movement, braking, steering, and cushioning.

[0061] See Figure 1As shown, the braking system of the corner module provided in this application includes a driver 2000, a reducer 3000, a brake cylinder 1000, and a brake caliper 4000. The driver 2000 has an output shaft, the input end of the reducer 3000 is connected to the output shaft, the lead screw 1200 of the brake cylinder 1000 is connected to the output end of the reducer 3000 via an input shaft 1500, and the cylinder sleeve 1400 of the brake cylinder 1000 is connected to the brake caliper 4000. The driver 2000 can use a suitable type of drive motor, which transmits rotational power through the reducer 3000 via its output axis. The reducer 3000 reduces and increases the torque of the rotational power before outputting it to the brake cylinder 1000, thereby driving the brake caliper 4000 to brake the tires with high torque. Those skilled in the art can choose a suitable method to assemble the corner module according to actual needs; no limitations are imposed here.

[0062] Continue reading Figure 2 As shown, in one embodiment, the reducer 3000 may include a housing 3001, a first gear 3100, a second gear 3200, a third gear 3300, and a fourth gear 3400. The housing 3001 has an inner cavity, therefore, the first gear 3100, the second gear 3200, the third gear 3300, and the fourth gear 3400 can be rotatably assembled into the inner cavity according to a preset assembly method.

[0063] For example, the first gear 3100 is rotatably assembled in the housing cavity via the first bearing sleeve, and a deep groove ball bearing is fitted between the first gear 3100 and the first bearing sleeve. The second gear 3200 is rotatably assembled in the housing cavity via the second bearing sleeve, and a deep groove ball bearing is fitted between the second gear 3200 and the second bearing sleeve. The third gear 3300 is rotatably assembled in the housing cavity via the third bearing sleeve, and a deep groove ball bearing is fitted between the third gear 3300 and the third bearing sleeve. The fourth gear 3400 is rotatably assembled in the housing cavity via the fourth bearing sleeve, and an angular contact ball bearing is fitted between the fourth gear 3400 and the fourth bearing sleeve. The deep groove ball bearing has better load-bearing capacity, while the angular contact ball bearing can operate at higher speeds and has a stronger load-bearing capacity.

[0064] The output shaft of the driver 2000 is connected to the first gear 3100. The second gear 3200, the third gear 3300, and the fourth gear 3400 are all driven meshed with each other. The fourth gear 3400 is connected to the lead screw 1200 of the brake cylinder 1000 via the input shaft 1500. Through the successive transmission of the first gear 3100, second gear 3200, third gear 3300, and fourth gear 3400, the output shaft of the driver 2000 can reduce and increase the torque of its rotational power before outputting it to the brake cylinder 1000. The second gear 3200 and third gear 3300 can be double-stage gears. The distal end of the output shaft of the driver 2000 can be equipped with an adjusting washer and a round nut retaining washer for mechanical interlocking and fastening between the first gear 3100 and the output shaft, improving sealing performance.

[0065] See Figures 3 to 5 As shown, this application provides a brake cylinder 1000, which includes a cage 1100, a lead screw 1200, a roller 1300, and a cylinder sleeve 1400. The lead screw 1200 is rotatably mounted on the cage 1100. A first gear pair 1220 and a first thread pair 1210 are provided on the circumferential surface of the lead screw 1200, and a second thread pair 1310 and a second gear pair 1320 are provided on the circumferential surface of the roller 1300. Wherein, as... Figure 4 As shown, the number of rollers 1300 is configured to be several, and several rollers 1300 are rotatably mounted on the cage 1100, and several rollers 1300 surround the lead screw 1200 along the circumferential direction of the lead screw 1200.

[0066] Based on the assembly configuration of several rollers 1300 around the lead screw 1200 along its circumference, the relative assembly clearance between the rollers 1300 and the lead screw 1200 located at the center of the rollers 1300 can be adjusted relative to the cage 1100. This allows the first threaded pair 1210 of the rollers 1300 to be driven and assembled with the second threaded pair 1310 of the lead screw 1200, and the first gear pair 1220 of the rollers 1300 to be driven and assembled with the second gear pair 1320 of the lead screw 1200. Therefore, when the lead screw 1200 is driven to rotate by the rotational power applied by the driver 2000, the fixed-axis rotation of the lead screw 1200 can drive the several rollers 1300 to rotate synchronously along their respective central axes.

[0067] like Figure 4 and Figure 5As shown, the cylinder sleeve 1400 has a cylinder cavity 1410 inside, and a cylinder cover 1800 is provided at the cavity opening of the cylinder sleeve 1400. A third threaded pair 1420 is provided inside the cylinder cavity 1410. The cylinder sleeve 1400 is assembled to the outside of the cage 1100, rollers 1300 and lead screw 1200, and the second threaded pairs 1310 of several rollers 1300 are driven to assemble with the third threaded pairs 1420 of the cylinder sleeve 1400. Therefore, when several rollers 1300 rotate synchronously along their respective central axes, the cylinder sleeve 1400 can be synchronously driven to move through the third threaded pairs 1420. At this time, the fixed-axis rotation of the lead screw 1200 and several rollers 1300 can be converted into linear motion of the cylinder sleeve 1400.

[0068] In this application, the brake cylinder 1000 comprises a ball screw mechanism constructed from a lead screw 1200, several rollers 1300, and a cylinder sleeve 1400, wherein the cylinder sleeve 1400 serves as the nut for linear motion within the ball screw mechanism. Figure 4 and Figure 5 As shown, the use of a roller screw mechanism for power transmission allows for placement in confined spaces, meeting the space constraints of corner modules. Furthermore, the design of the roller screw mechanism for power transmission converts rotational motion into linear motion, significantly improving transmission efficiency. Combined with its excellent spatial adaptability, it enables superior transmission efficiency within the confined space of corner modules, fulfilling the design requirements of corner modules in electric vehicles.

[0069] Continue reading Figure 4 and Figure 5 As shown, in one embodiment, the number of first threaded pairs 1210 is configured to be one, and the number of first gear pairs 1220 is configured to be two, with the first threaded pair 1210 located between the two first gear pairs 1220 along the axial direction of the lead screw 1200. Correspondingly, the number of second threaded pairs 1310 is configured to be one, and the number of second gear pairs 1320 is configured to be two, with the second threaded pair 1310 located between the two second gear pairs 1320 along the axial direction of the roller 1300. The two first gear pairs 1220 of the roller 1300 are respectively driven and assembled with the two second gear pairs 1320 of the lead screw 1200. Furthermore, the axial length of the first threaded pair 1210 along the lead screw 1200 is greater than the axial length of any one of the first threaded pairs 1210 along the lead screw 1200, and the axial length of the second threaded pair 1310 along the roller 1300 is greater than the axial length of any one of the second threaded pairs 1310 along the roller 1300.

[0070] Continue reading Figures 3 to 5As shown, in one embodiment, the brake cylinder 1000 may include an input shaft 1500, a retaining ring 1600, and a sensor 1700. The input shaft 1500 is mounted on a cage 1100 and a cylinder head 1800, and is drivenly connected to a lead screw 1200. The retaining ring 1600 is mounted on the cage 1100 and is fitted around the outer periphery of the input shaft 1500. The sensor 1700 is mounted on the outside of the cylinder head 1800. The input shaft 1500 is used to connect to a driver 2000, thereby receiving rotational power from the driver 2000 and transmitting the rotational power to the lead screw 1200. This power indirectly drives the cylinder sleeve 1400 to move linearly through several rollers 1300. The linear movement of the cylinder sleeve 1400 drives the brake caliper 4000 to perform a braking operation against the wheel hub. Furthermore, the sensor 1700 can be a pressure sensor 1700, which detects the pressure value applied by the cylinder liner 1400 to the brake caliper 4000, thereby enabling the electromechanical braking system to achieve more precise open-loop control.

[0071] In one embodiment, the cage 1100 includes a first end plate 1110 and a second end plate 1120. The first end plate 1110 and the second end plate 1120 have mutually engaging first pivot holes and a plurality of second pivot holes surrounding the first pivot holes. A lead screw 1200 is rotatably mounted between the first pivot holes of the first end plate 1110 and the second end plate 1120 along its central axis. A plurality of rollers 1300 are rotatably mounted between the plurality of second pivot holes of the first end plate 1110 and the second end plate 1120 along their respective central axes, and the central axis of the lead screw 1200 and the plurality of central axes of the rollers 1300 are parallel to each other. Therefore, the first pivot holes and the plurality of second pivot holes can stably mount the lead screw 1200 and the plurality of rollers 1300 to the cage 1100, thereby limiting the centrifugal force of the lead screw 1200 and the plurality of rollers 1300 during high-speed operation.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A brake cylinder (1000), characterized in that, The brake cylinder (1000) includes: Cage (1100); A lead screw (1200) is rotatably mounted on a cage (1100), and a first gear pair (1220) and a first thread pair (1210) are provided on the surface of the lead screw (1200). A roller (1300) has a second threaded pair (1310) and a second gear pair (1320) on its surface; the number of rollers (1300) is configured to be a plurality, the plurality of rollers (1300) are rotatably mounted on the cage (1100), and the plurality of rollers (1300) are arranged around the lead screw (1200) along the circumferential direction of the lead screw (1200); the first threaded pair (1210) of the roller (1300) is driven to be assembled with the second threaded pair (1310) of the plurality of lead screws (1200); the first gear pair (1220) of the roller (1300) is driven to be assembled with the second gear pair (1320) of the plurality of lead screws (1200). A cylinder sleeve (1400) has a cylinder cavity (1410) inside. A cylinder cover (1800) is provided at the cavity opening of the cylinder sleeve (1400). A third threaded pair (1420) is provided in the cylinder cavity (1410). The cylinder sleeve (1400) is assembled on the outside of the cage (1100), the roller (1300) and the lead screw (1200). The second threaded pairs (1310) of a plurality of rollers (1300) are driven to assemble with the third threaded pairs (1420) of the cylinder sleeve (1400).

2. The brake cylinder (1000) according to claim 1, characterized in that, The number of the first threaded pair (1210) is configured to be one, the number of the first gear pair (1220) is configured to be two, and the first threaded pair (1210) is located between the two first gear pairs (1220) along the axial direction of the lead screw (1200); The number of the second threaded pair (1310) is configured to be one, and the number of the second gear pair (1320) is configured to be two. The second threaded pair (1310) is located between the two second gear pairs (1320) along the axial direction of the roller (1300); wherein the two first gear pairs (1220) of the roller (1300) and the two second gear pairs (1320) of the plurality of lead screws (1200) are respectively driven and assembled.

3. The brake cylinder (1000) according to claim 2, characterized in that, The first threaded pair (1210) has an axial length along the lead screw (1200) greater than the axial length of any one of the first threaded pairs (1210) along the lead screw (1200); and / or, The second threaded pair (1310) has an axial length along the roller (1300) greater than the axial length of any one of the second threaded pairs (1310) along the roller (1300).

4. The brake cylinder (1000) according to claim 1, characterized in that, The brake cylinder (1000) includes: An input shaft (1500) is mounted on the cage (1100) and the cylinder head (1800), and the input shaft (1500) is drivenly connected to the lead screw (1200); A retaining ring (1600) is assembled to the retainer (1100) and is fitted onto the outer periphery of the input shaft (1500); Sensor (1700), which is mounted on the outside of the cylinder head (1800).

5. The brake cylinder (1000) according to claim 1, characterized in that, The retainer (1100) includes a first end plate (1110) and a second end plate (1120). The first end plate (1110) and the second end plate (1120) are provided with a first pivot hole and a plurality of second pivot holes that cooperate with each other. The plurality of second pivot holes surround the first pivot hole. The lead screw (1200) is rotatably mounted between the first shaft hole of the first end plate (1110) and the second end plate (1120) along its central axis, and a plurality of rollers (1300) are rotatably mounted between a plurality of second shaft holes of the first end plate (1110) and the second end plate (1120) along their respective central axes, and the central axis of the lead screw (1200) and the central axes of the rollers (1300) are parallel to each other.

6. A braking system, characterized in that, The braking system includes: A driver (2000) having an output shaft; A speed reducer (3000), the input end of which is connected to the output shaft; The brake cylinder (1000) as described in any one of claims 1-5, wherein the lead screw (1200) of the brake cylinder (1000) is connected to the output end of the reducer (3000) via an input shaft (1500); The brake caliper (4000) is connected to the cylinder sleeve (1400) of the brake cylinder (1000).

7. The braking system according to claim 6, characterized in that, The reducer (3000) includes: Device housing (3001), wherein an inner cavity is provided inside the device housing (3001); The first gear (3100) is rotatably mounted in the inner cavity of the housing, and the output shaft of the driver (2000) is connected to the first gear (3100); The second gear (3200) is rotatably mounted in the inner cavity of the housing, and the second gear (3200) engages with the first gear (3100) in a driving manner; The third gear (3300) is rotatably mounted in the inner cavity of the housing, and the third gear (3300) is driven to mesh with the second gear (3200); The fourth gear (3400) is rotatably mounted in the inner cavity of the housing, and the fourth gear (3400) meshes with the third gear (3300) in a driving manner, and the fourth gear (3400) is connected to the lead screw (1200) of the brake cylinder (1000) through the input shaft (1500).

8. The braking system according to claim 7, characterized in that, The first gear (3100) is rotatably mounted in the inner cavity of the housing via a first bearing sleeve, and a deep groove ball bearing is fitted between the first gear (3100) and the first bearing sleeve; and / or, The second gear (3200) is rotatably mounted in the inner cavity of the housing via a second bearing sleeve, and a deep groove ball bearing is fitted between the second gear (3200) and the second bearing sleeve; and / or, The third gear (3300) is rotatably mounted in the inner cavity of the housing via a third bearing sleeve, and a deep groove ball bearing is fitted between the third gear (3300) and the third bearing sleeve; and / or, The fourth gear (3400) is rotatably assembled in the inner cavity of the housing via the fourth bearing sleeve, and an angular contact ball bearing is assembled between the fourth gear (3400) and the fourth bearing sleeve.

9. A corner module, characterized in that, The corner module includes the braking system as described in any one of claims 6-8.

10. An electric vehicle, characterized in that, The electric vehicle includes the corner module as described in claim 9.

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