Brake and vehicle

Abstract

The vehicle comprises a brake disc and the brake, the brake comprises a driving device, a speed reducing and torque increasing device and a brake executing device, the driving device comprises a shell and a driving source, the shell is provided with a cavity with an opening in one end, and the driving source is arranged in the cavity and provided with an output shaft; the speed reducing and torque increasing device is embedded in the cavity and seals the opening of the cavity, so that the size of the brake in the axial direction of the hub can be obviously reduced, and the size of the brake can be effectively reduced. The speed reducing and torque increasing device is coaxially connected to the output shaft and coaxially connected to the brake executing device, the brake executing device is provided with a first brake pad, and the first brake pad is configured to move in the axial direction of the output shaft under driving of the driving source so as to be attached to the brake disc or separated from the brake disc, so that the transmission ratio of the speed reducing and torque increasing device can be evenly distributed; and load transmission is stable, the structure is simple, the transmission efficiency is high, and the service life of transmission parts is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle braking, in particular to a brake and a vehicle. BACKGROUND

[0002] The brake is an essential component in the automobile, which mainly functions to slow down or even stop the vehicle in motion, keep the speed of the vehicle in downhill driving stable, and keep the stopped vehicle stationary. With the development of vehicle electronicization and intelligentization, the traditional hydraulic brake has been unable to meet the design requirements, and the electro mechanical brake (EMB) has replaced it. Compared with the hydraulic brake, the electro mechanical brake uses cleaner electric energy to replace the traditional hydraulic energy, uses lighter, more responsive and more sensitive electric wires to replace the traditional hydraulic pipeline, and has the characteristics of intelligent control, which conforms to the development direction of vehicle modularization, integration and mechatronics, and becomes the development direction of future vehicle braking system.

[0003] However, the existing electro mechanical brake still has the problem of relatively bulky structure and high demand for installation space size, especially for large vehicles such as mine transport and special vehicles, which frequently drive on large slope road conditions, and have higher demand for installation space size. Therefore, how to effectively reduce the volume and mass of the electro mechanical brake under the premise of meeting the braking demand of the whole vehicle becomes the key to its popularization and application. CONTENT OF THE INVENTION

[0004] Therefore, in view of the deficiencies in the prior art, the present application provides a brake and a vehicle to solve the problem of the existing electro mechanical brake having a relatively bulky structure and high demand for installation space size.

[0005] According to one aspect of the present application, a brake is provided, comprising:

[0006] A driving device, comprising a housing and a driving source, the housing having a cavity, and the driving source being arranged in the cavity and having a solid output shaft;

[0007] A speed reduction and torque increasing device, at least partially embedded in the cavity, the speed reduction and torque increasing device having an input end and an output end oppositely arranged along the axial direction thereof, the input end being arranged towards the output shaft and coaxially connected to the output shaft;

[0008] A brake executing device, coaxially connected to the output end of the speed reduction and torque increasing device, the brake executing device having a first brake pad, the first brake pad being configured to move along the axial direction of the output shaft under the driving of the driving source, so as to be able to abut or separate from a brake disc.

[0009] In one of the embodiments, the outer circumferential surface of the output shaft is sleeved with a bearing, the outer circumferential surface of the bearing is sleeved with a bearing support, the bearing support separates the cavity into a first cavity and a second cavity, the driving source is arranged in the first cavity, and at least part of the speed increasing and reducing device is arranged in the second cavity.

[0010] In one of the embodiments, the outer circumferential surface of the speed increasing and reducing device is fixedly attached to the cavity wall of the cavity.

[0011] In one of the embodiments, the speed increasing and reducing device comprises at least two speed reducing mechanisms which are coaxially and sequentially connected along the axial direction of the speed increasing and reducing device, among all the speed reducing mechanisms, the speed reducing mechanism which constitutes the input end is defined as a first-stage speed reducing mechanism, and the speed reducing mechanism which constitutes the output end is defined as a last-stage speed reducing mechanism, the first-stage speed reducing mechanism is connected to the output shaft, and the last-stage speed reducing mechanism is connected to the brake actuating device.

[0012] In one of the embodiments, each of the speed reducing mechanisms comprises:

[0013] a sun gear which is coaxially arranged with the output shaft;

[0014] a plurality of planet gears which are arranged around the sun gear and rotatably engaged with the outer circumferential surface of the sun gear;

[0015] an outer ring gear, the outer circumferential surface of the outer ring gear is fixedly attached to the inner circumferential surface of the housing, and the inner circumferential surface of the outer ring gear has a plurality of engagement teeth, all the planet gears are rotatably engaged with the inner circumferential surface of the outer ring gear through the engagement teeth;

[0016] a planet carrier which is connected to all the planet gears and coaxially arranged with the sun gear, the planet carrier has a connecting shaft which is coaxially arranged with the output shaft, and the planet carrier can rotate around the central axis thereof when all the planet gears rotate around the central axis of the sun gear;

[0017] the sun gear of the first-stage speed reducing mechanism is connected to the output shaft, the sun gears of the rest of the speed reducing mechanisms are connected to the planet carriers of the previous-stage speed reducing mechanisms, the connecting shaft of the planet carrier in the last-stage speed reducing mechanism is connected to the brake actuating device, and the connecting shaft of the planet carrier in the rest of the speed reducing mechanisms is connected to the sun gear of the next-stage speed reducing mechanism.

[0018] In one of the embodiments, the brake executing device comprises a screw rod shaft and a nut, the screw rod shaft is connected to the output end of the speed reduction and torque increasing device, the nut is sleeved on the screw rod shaft and is threadedly connected with the screw rod shaft, and the first brake block is connected to the nut. When the screw rod shaft rotates around its central axis, the nut can drive the first brake block to move along the axial direction of the screw rod shaft.

[0019] In one of the embodiments, the screw rod shaft has a stepped surface facing the speed reduction and torque increasing device, and the brake further comprises a force sensor, which is sleeved on the screw rod shaft and abuts against the stepped surface.

[0020] In one of the embodiments, the brake executing device further comprises a caliper and a second brake block, the caliper is sleeved on the nut, the second brake block is connected to the caliper and is arranged opposite to the first brake block, and the second brake block is used to abut against the opposite side of the brake disc when the first brake block abuts against one side of the brake disc.

[0021] In one of the embodiments, the brake executing device further comprises a limiting piece, the limiting piece is penetrated through the caliper and partially exposed on the inner circumferential surface of the caliper, the outer circumferential surface of the nut is provided with a limiting groove, and the part of the limiting piece exposed on the inner circumferential surface of the caliper is limited in the limiting groove.

[0022] According to another aspect of the present application, a vehicle is provided, which comprises a hub, a brake disc and a brake according to any one of the above-mentioned embodiments, the hub is connected to the brake disc, and the first brake block of the brake is used to abut against the brake disc to provide a braking force for stopping the rotation of the brake disc.

[0023] The above-mentioned brake and vehicle can significantly reduce the size of the brake in the axial direction of the hub by embedding the speed reduction and torque increasing device of the brake in the housing of the driving device and closing the opening of the housing, so that the volume of the brake can be effectively reduced under the premise of meeting the braking demand of the whole vehicle. By relatively arranging the input end and the output end of the speed reduction and torque increasing device along the axial direction of the speed reduction and torque increasing device, coaxially connecting the input end to the output shaft of the driving device and coaxially connecting the output end to the brake executing device, the transmission ratio of the speed reduction and torque increasing device can be evenly distributed, the load can be stably transmitted, the structure is simple, the transmission efficiency is high, and the service life of the transmission parts can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The axial view of the brake and the brake disc according to one of the embodiments of the present application is shown.

[0025] Figure 2 The sectional view of the brake and the brake disc according to one of the embodiments of the present application is shown.

[0026] Figure 3 An exploded view of the drive device and the speed reduction and torque increasing device according to an embodiment of the present application.

[0027] Figure 4 An exploded view of the speed reduction and torque increasing device according to an embodiment of the present application.

[0028] Figure 5 An exploded view of the speed reduction and torque increasing device according to an embodiment of the present application. Figure 2 An enlarged view of the A region in FIG. 6.

[0029] Explanation of Reference Numerals:

[0030] 10, brake; 100, drive device; 110, housing; 111, cavity; 111a, first cavity; 111b, second cavity; 120, drive source; 121, output shaft; 122, stator; 130, bearing; 140, bearing support; 200, speed reduction and torque increasing device; 201, input end; 202, output end; 210, speed reduction mechanism; 210a, first stage speed reduction mechanism; 210b, last stage speed reduction mechanism; 211, sun gear; 212, planetary gear; 213, outer ring gear; 214, carrier; 2141, connecting shaft; 300, brake execution device; 310, first brake pad; 320, second brake pad; 330, screw shaft; 331, limit groove; 340, nut; 350, thrust disc; 360, caliper; 370, limiting member; 400, force sensor; 500, thrust roller bearing; 600, control unit; 70, brake disc. DETAILED DESCRIPTION

[0031] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without some or all of these details. In other instances, well known process steps have not been described in detail in order to avoid unnecessarily obscuring the present application. Therefore, the specific embodiments described herein are not intended to be limiting, but rather are to serve as examples for the practicing the present application.

[0032] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0033] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this application, unless otherwise explicitly specified and limited, if there are terms "installation", "connection", "connection", "fixation" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0035] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "on" or "under" the first feature on the second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0036] It should be noted that, if an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intervening element. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used herein are used for explanation purposes only and are not intended to be the only implementation.

[0037] The application provides a brake and a vehicle, the vehicle comprising a wheel hub, a brake disc connected to the wheel hub, and the brake described above, when the vehicle is running, the wheel hub rotates together with the brake disc, the brake is used to provide a braking force to stop the rotation of the brake disc when the brake disc rotates, so as to stop the rotation of the wheel hub, so as to slow down or even stop the running vehicle, or to keep the speed of the vehicle stable.

[0038] The structure of the brake will be described below. It can be understood that in other embodiments, the brake of the application is not limited to being used only in vehicles, but can also be used in any braking scene, which is not limited herein.

[0039] Referring to Figure 1 and Figure 2 , Figure 1 a schematic view of a brake 10 provided by an embodiment of the application is shown, Figure 2 a sectional view of the brake 10 provided by the embodiment is shown. The brake 10 provided by an embodiment of the application comprises a driving device 100, a speed reduction and torque amplification device 200 and a brake execution device 300 connected in sequence. The driving device 100 is used to output torque, the speed reduction and torque amplification device 200 is used to reduce the rotation speed of the driving device 100 and amplify the torque output by the driving device 100, and the brake execution device 300 is used to abut against the brake disc 70 under the drive of the amplified torque, so as to be able to apply a braking force to the brake disc 70 to achieve the purpose of braking.

[0040] Specifically, in one embodiment, in combination with Figure 2 and Figure 3As shown, the driving device 100 comprises a housing 110 having a cavity 111 with one end open and a driving source 120 arranged in the cavity 111 and having a solid output shaft 121 arranged in the cavity 111; the speed reduction and torque increasing device 200 is embedded in the cavity 111 and closes the opening of the cavity 111, and has an input end 201 and an output end 202 oppositely arranged along the axial direction of the speed reduction and torque increasing device 200, the input end 201 is arranged towards the output shaft 121 and coaxially connected to the output shaft 121, and the output shaft 121 is arranged towards the brake execution device 300 and coaxially connected to the brake execution device 300, so that the driving device 100, the speed reduction and torque increasing device 200 and the brake execution device 300 are coaxially arranged; the brake execution device 300 has a first brake piece 310 and a second brake piece 320 oppositely arranged, and the brake disc 70 is located between the first brake piece 310 and the second brake piece 320. The first brake piece 310 is configured to move along the axial direction of the output shaft 121 under the driving of the driving source 120, so as to be able to abut on one side of the brake disc 70 or be separated from the brake disc 70, when the first brake piece 310 abuts on one side of the brake disc 70, the second brake piece 320 abuts on the opposite side of the brake disc 70, so that the first brake piece 310 and the second brake piece 320 can clamp the brake disc 70 together, thereby making the rotating brake disc 70 decelerate or stop rotating.

[0041] Exemplarily, in the embodiment, the driving source 120 is a motor, the motor has a stator 122, and the output shaft 121 is connected to the stator 122, when the stator 122 works, the output shaft 121 can rotate around the central axis thereof and drive the speed reduction and torque increasing device 200 to work at the same time, the speed reduction and torque increasing device 200 reduces the rotating speed output by the output shaft 121 and amplifies the torque output by the output shaft 121, so as to be able to generate a large enough torque to drive the brake execution device 300 to work, so that the first brake piece 310 can move along the axial direction of the output shaft 121.

[0042] In one embodiment, as shown in combination with FIG. 1 and FIG. 2, the outer circumferential surface of the output shaft 121 is sleeved with a bearing 130, in order to fix the bearing 130, the bearing 130 is installed in a bearing support 140, specifically, the bearing support 140 is sleeved on the outer circumferential surface of the bearing 130, and the outer circumferential edge of the bearing support 140 abuts against the cavity wall of the cavity 111, so that the bearing support 140 divides the cavity into a first cavity 111a and a second cavity 111b, the stator 122 is arranged in the first cavity 111a, and the output shaft 121 penetrates through the bearing support 140, so that the end of the output shaft 121 away from the stator 122 is located in the second cavity 111b, and the speed reduction and torque increasing device 200 is arranged in the second cavity 111b.

[0043] Preferably, the outer circumferential surface of the speed reduction and torque increasing device 200 is fixedly attached to the cavity wall of the cavity 111 of the housing 110, so that the speed reduction and torque increasing device 200 can avoid falling out of the cavity 111 due to its own vibration when working.

[0044] As can be seen, by embedding the speed reduction and torque increasing device 200 in the housing 110 of the driving device 100, the size of the brake 10 in the axial direction of the vehicle wheel hub can be significantly reduced, so that the volume and mass of the brake 10 can be effectively reduced under the premise of meeting the braking demand of the whole vehicle. Compared with a hydraulic brake, the response time of the motor mechanical brake is faster, the braking distance is shorter, and the braking safety is higher.

[0045] Please continue to refer to Figure 2 and Figure 3 , the specific structure of the speed reduction and torque increasing device 200, in one embodiment, the speed reduction and torque increasing device 200 includes two speed reduction mechanisms 210 coaxially connected in series along the axial direction thereof, among all the speed reduction mechanisms 210, the speed reduction mechanism 210 constituting the input end 201 is defined as the first-stage speed reduction mechanism 210a, and the speed reduction mechanism 210 constituting the output end 202 is defined as the last-stage speed reduction mechanism 210b, the first-stage speed reduction mechanism 210a is connected to the output shaft 121 of the driving device 100, and the last-stage speed reduction mechanism 210b is connected to the brake execution device 300.

[0046] In one embodiment, all the speed reduction mechanisms 210 are of the structure of a planetary gear set, specifically, as shown in Figure 4 , each speed reduction mechanism 210 includes a sun gear 211, a plurality of planet gears 212, an outer ring gear 213, and a planet carrier 214, wherein the sun gear 211 is coaxially arranged with the output shaft 121 of the driving device 100; the plurality of planet gears 212 are arranged around the sun gear 211 and rotatably engaged with the outer circumferential surface of the sun gear 211; the outer circumferential surface of the outer ring gear 213 is fixedly attached to the inner circumferential surface of the housing 110 in the driving device 100, and the inner circumferential surface of the outer ring gear 213 has a plurality of engagement teeth, all the planet gears 212 are rotatably connected to the inner circumferential surface of the outer ring gear 213 through the engagement teeth; the planet carrier 214 is connected to all the planet gears 212, and the planet carrier 214 is coaxially arranged with the sun gear 211 and has a connecting shaft 2141 coaxially arranged with the sun gear 211 (also coaxially arranged with the output shaft 121).

[0047] When the sun gear 211 rotates around its central axis, the sun gear 211 can drive all the planet gears 212 to revolve around the central axis of the sun gear 211 and rotate around the central axes of the planet gears 212; with all the planet gears 212 revolving around the central axis of the sun gear 211, the planet carrier 214 can also rotate around its central axis; and since the outer gear ring 213 is fixedly attached to the inner circumferential surface of the housing 110 of the driving device 100, the outer gear ring 213 can be prevented from rotating around the central axis of the sun gear 211 when all the planet gears 212 rotate around the central axis of the sun gear 211.

[0048] In the embodiments shown in Figure 4 and Figure 5 , one of the reduction mechanisms 210 constitutes the input end 201 and serves as the primary reduction mechanism 210a, and the sun gear 211 of the primary reduction mechanism 210a is coaxially sleeved on the output shaft 121 through the spline structure; the other reduction mechanism 210 constitutes the output end 202 and serves as the final reduction mechanism 210b, and the sun gear 211 of the final reduction mechanism 210b is also coaxially sleeved on the connecting shaft 2141 of the planet carrier 214 in the primary reduction mechanism 210a through the spline structure, and the connecting shaft 2141 of the planet carrier 214 in the final reduction mechanism 210b is also connected to the brake actuator 300 through the spline structure.

[0049] As can be seen, from the direction in which the primary reduction mechanism 210a points to the final reduction mechanism 210b, the two reduction mechanisms 210 constitute a two-stage reduction ratio, when the output shaft 121 rotates at a first rotational speed, the connecting shaft 2141 of the primary reduction mechanism 210a can output a second rotational speed smaller than the first rotational speed, and the output torque is larger than the torque output by the output shaft 121, thereby completing the first reduction and torque increase; and when the connecting shaft 2141 of the primary reduction mechanism 210a rotates at the second rotational speed, the connecting shaft 2141 of the final reduction mechanism 210b can output a third rotational speed smaller than the second rotational speed, and the output torque is larger than the torque output by the connecting shaft 2141 of the primary reduction mechanism 210a, thereby completing the second reduction and torque increase, so that the first brake pad 310 can abut against the brake disc 70 with a larger abutment force.

[0050] Of course, it can be understood that in other embodiments, the number of speed reduction mechanisms 210 can not be limited to two, but can be any number, and multiple speed reduction mechanisms 210 can complete multiple speed reduction and torque increase on the rotational speed and torque output by the output shaft 121. Specifically, when the number of speed reduction mechanisms 210 is multiple, all speed reduction mechanisms 210 are connected in series, wherein the sun gear 211 of the first speed reduction mechanism 210a is coaxially connected to the output shaft 121 of the driving device 100, the sun gears 211 of the remaining speed reduction mechanisms 210 are connected to the connecting shafts 2141 of the planet carriers 214 of the previous speed reduction mechanism 210; and the connecting shaft 2141 of the planet carrier 214 of the last speed reduction mechanism 210b is connected to the brake execution device 300, and the connecting shafts 2141 of the planet carriers 214 of the remaining speed reduction mechanisms 210 are connected to the sun gears 211 of the next speed reduction mechanism 210. Each speed reduction mechanism 210 can complete one speed reduction and torque increase, so that multiple speed reduction mechanisms 210 can complete multiple speed reduction and torque increase. From the first speed reduction mechanism 210a to the last speed reduction mechanism 210b, all speed reduction mechanisms 210 constitute multiple speed reduction ratios, which will not be described here.

[0051] It can also be understood that the speed reduction and torque increase device 200 can also be a planetary gear set structure as a whole, so in this case, the speed reduction and torque increase device 200 only constitutes a single speed reduction ratio, which is not particularly limited here.

[0052] Referring to Figure 5 In one embodiment, the brake execution device 300 includes a lead screw shaft 330 and a nut 340, the lead screw shaft 330 is connected to the output end 202 of the speed reduction and torque increase device 200, i.e. the lead screw shaft 330 is coaxially connected to the connecting shaft 2141 of the planet carrier 214 of the last speed reduction mechanism 210b, the nut 340 is sleeved on the lead screw shaft 330 and threadedly connected with the lead screw shaft 330, the first brake pad 310 is indirectly connected with the nut 340 through a thrust disc 350 integrally connected to the nut 340; when the lead screw shaft 330 rotates around its central axis together with the planet wheel 212, the lead screw shaft 330 can convert the torque output by the output shaft 121 of the driving source 120 and transmitted through the speed reduction and torque increase device 200 into an axial force distributed along the axial direction of the lead screw shaft 330, and the nut 340 can move along the axial direction of the lead screw shaft 330 and drive the first brake pad 310 to move together after being subjected to the axial force, so that the first brake pad 310 can clamp the brake disc 70 together with the second brake pad 320, thereby realizing the functions of braking and speed reduction.

[0053] Further, the brake execution device 300 further includes a caliper 360, the caliper 360 is fixedly connected to the housing 110 of the driving device 100 and sleeved on the nut 340, in combination with Figure 2As shown, the second brake pad 320 is fixedly connected to the caliper 360 and is arranged opposite to the first brake pad 310, when the first brake pad 310 moves along the axial direction of the screw shaft 330, the distance between the first brake pad 310 and the second brake pad 320 can change, thus the brake disc 70 can be clamped or released.

[0054] In this way, by the above arrangement, the driving source 120, the speed reduction and torque increasing device 200 and the brake executing device 300 are coaxially arranged, thus the transmission ratio of the speed reduction and torque increasing device 200 is uniformly distributed, the load is stably transmitted, the structure is simple and has high transmission efficiency, which is beneficial to prolong the service life of the transmission parts.

[0055] Further, as shown in Figure 5 When the screw shaft 330 rotates, in order to avoid that the nut 340 is driven to rotate together with the screw shaft 330, the brake executing device 300 further comprises a limiting piece 370, the limiting piece 370 is arranged through the caliper 360 and partially exposed to the inner circumferential surface of the caliper 360; correspondingly, the outer circumferential surface of the nut 340 is provided with a limiting groove 331, and the part of the limiting piece 370 exposed to the inner circumferential surface of the caliper 360 is limited in the limiting groove 331. In this way, when the screw shaft 330 rotates, although the nut 340 also has a tendency to be driven to rotate together with the screw shaft 330, since the limiting piece 370 is limited in the limiting groove 331 and abuts against the groove wall of the limiting groove 331, the nut 340 cannot be driven to rotate together with the screw shaft 330, but can only move along the axial direction of the screw shaft 330, thus the anti-rotation ability of the outer ring gear 213 is improved.

[0056] In addition, as shown in Figure 2 and Figure 5 In a preferred embodiment, the screw shaft 330 has a stepped surface facing the speed reduction and torque increasing device 200, the brake 10 further comprises a force sensor 400 and a control unit 600, the force sensor 400 is sleeved on the screw shaft 330 and abuts against the stepped surface of the screw shaft 330 through a thrust roller bearing 500 sleeved on the screw shaft 330, and the control unit 600 is communicatively connected to the force sensor 400. In the embodiment shown in the figure, the control unit 600 is sleeved on the output end 202 of the speed reduction and torque increasing device 200, i.e. a connecting shaft 2141 sleeved on the planet carrier 214 in the last-stage speed reduction mechanism 210b, and the control unit 600 is located between the housing 110 of the driving device 100 and the speed reduction and torque increasing device 200, thus the space can be saved, and the overall size of the brake 10 is more compact.

[0057] The purpose of the control unit 600 is to receive the brake signal when the driver steps on the brake pedal when the vehicle is running in different working conditions, such as when deceleration is required. The sensor on the brake pedal detects the pedal acceleration, displacement, and pedal force, and the control unit 600 can receive the above brake signal through the vehicle network and calculate the optimal brake force required by each wheel in real time through a specific algorithm, and then transmit the optimal brake force required to the brake execution device 300, so as to achieve the purpose of braking. When the first brake pad 310 abuts against the brake disc 70, the brake force applied by the first brake pad 310 to the brake disc 70 can be transmitted to the force sensor 400 through the thrust disc 350, the screw shaft 330, and the thrust roller bearing 500 in turn. The force sensor 400 can detect the brake force applied by the first brake pad 310 to the brake disc 70 in real time and feed back the signal representing the brake force to the control unit 600 in time, so that the control unit 600 can adjust the brake force in real time, so that the brake 10 provided by the application can realize force closed-loop control, and the brake 10 has the characteristics of intelligent control, so that the vehicle can develop in the direction of modularization, integration, and mechatronics.

[0058] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0059] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. A brake characterized by, The application relates to a drive device (100) comprising a housing (110) having a cavity (111) and a drive source (120) arranged in the cavity (111) and having a solid output shaft (121); a speed reduction and torque increasing device (200) at least partially embedded in the cavity (111), the speed reduction and torque increasing device (200) having an input end (201) and an output end (202) oppositely arranged along an axis of the speed reduction and torque increasing device (200), the input end (201) being arranged towards the output shaft (121) and coaxially connected to the output shaft (121); and a brake executing device (300) coaxially connected to the output end (202) of the speed reduction and torque increasing device (200), the brake executing device (300) having a first brake pad (310) configured to move along an axis of the output shaft (121) under the drive of the drive source (120) to abut or separate from a brake disc (70). The output shaft (121) is sleeved with a bearing (130), the bearing (130) is sleeved with a bearing support (140), the bearing support (140) divides the cavity (111) into a first cavity (111a) and a second cavity (111b), part of the drive source (120) is arranged in the first cavity (111a), and at least part of the speed reduction and torque increasing device (200) is arranged in the second cavity (111b). The outer periphery of the speed reduction and torque increasing device (200) is fixedly attached to the cavity wall of the cavity (111). The speed reduction and torque increasing device (200) comprises at least two speed reduction mechanisms (210) coaxially connected in series along an axis of the speed reduction and torque increasing device (200), all the speed reduction mechanisms (210) are defined as a first-stage speed reduction mechanism (210a) constituting the input end (201) and a last-stage speed reduction mechanism (210b) constituting the output end (202), the first-stage speed reduction mechanism (210a) is connected to the output shaft (121), and the last-stage speed reduction mechanism (210b) is connected to the brake executing device (300).

2. The brake of claim 1, wherein Each of the speed reduction mechanisms (210) comprises a sun gear (211) coaxially arranged with the output shaft (121), a plurality of planet gears (212) surrounding the sun gear (211) along a central axis of the sun gear (211) and rotatably engaged with an outer periphery of the sun gear (211), and an outer ring gear (213) having an outer periphery fixedly attached to an inner periphery of the housing (110) and an inner periphery provided with a plurality of engagement teeth, all the planet gears (212) being rotatably engaged with the inner periphery of the outer ring gear (213) through the engagement teeth.

3. The brake of claim 1, wherein ​ 4. The brake according to any one of claims 1-3, characterized in that ​ 5. The brake of claim 4, wherein, ​ ​ ​ ​ A planet carrier (214) connected to all the planet gears (212) and coaxially arranged with the sun gear (211), the planet carrier (214) having a connecting shaft (2141) coaxially arranged with the output shaft (121); when all the planet gears (212) rotate around the central axis of the sun gear (211), the planet carrier (214) can rotate around its central axis; The sun gear (211) of the first-stage speed reduction mechanism (210a) is connected to the output shaft (121), and the sun gears (211) of the rest of the speed reduction mechanisms (210) are connected to the planet carriers (214) of the previous-stage speed reduction mechanisms (210); in the last-stage speed reduction mechanism (210b), the connecting shaft (2141) of the planet carrier (214) is connected to the brake execution device (300), and in the rest of the speed reduction mechanisms (210), the connecting shaft (2141) of the planet carrier (214) is connected to the sun gear (211) of the next-stage speed reduction mechanism (210).

6. The brake of claim 1, wherein The brake execution device (300) includes a lead screw shaft (330) and a nut (340), the lead screw shaft (330) is connected to the output end (202) of the speed reduction and torque increasing device (200), the nut (340) is sleeved on the lead screw shaft (330) and threadedly connected with the lead screw shaft (330), and the first brake pad (310) is connected to the nut (340); when the lead screw shaft (330) rotates around its central axis, the nut (340) can drive the first brake pad (310) to move along the axial direction of the lead screw shaft (330).

7. The brake of claim 6 wherein, The lead screw shaft (330) has a stepped surface facing the speed reduction and torque increasing device (200), and the brake further includes a force sensor (400) sleeved on the lead screw shaft (330) and abutting against the stepped surface.

8. The brake of claim 6 wherein, The brake execution device (300) further includes a caliper (360) and a second brake pad (320), the caliper (360) is sleeved on the nut (340), and the second brake pad (320) is connected to the caliper (360) and arranged in opposite spacing with the first brake pad (310); the second brake pad (320) is used for abutting against the other side of the brake disc (70) when the first brake pad (310) abuts against one side of the brake disc (70).

9. The brake of claim 8, wherein, The brake execution device (300) further includes a limiting piece (370) penetrating through the caliper (360) and partially exposed on the inner circumferential surface of the caliper (360), and the outer circumferential surface of the nut (340) is provided with a limiting groove (331); the part of the limiting piece (370) exposed on the inner circumferential surface of the caliper (360) is limited in the limiting groove (331).

10. A vehicle characterized by comprising: A wheel hub, a brake disc (70) connected to the wheel hub, and a brake (10) according to any one of claims 1-9, the first brake pad (310) of the brake (10) being configured to abut the brake disc (70) to provide a braking force to stop rotation of the brake disc (70) when the brake disc (70) is rotating.

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