Brake mechanism, brake system and vehicle

Abstract

The embodiment of the invention discloses a braking mechanism, a braking system and a vehicle. The braking mechanism comprises a fixing part, a driving mechanism, a first piston, a second piston and an elastic component. The first piston and the second piston are arranged on the two sides of the brake disc respectively and are both in transmission connection with the driving mechanism, and the driving mechanism is connected with the fixing part through the elastic component. The driving mechanism is used for driving the first piston to move in the first direction and driving the second piston to move towards the brake disc in the second direction. Wherein the first direction is opposite to the second direction; the elastic component is used for driving the first piston and the second piston to move in the second direction when the brake disc makes contact with the first piston. Or when the brake disc makes contact with the second piston, the first piston and the second piston are driven to move in the first direction. Therefore, stress on the two sides of the brake disc is balanced, eccentric wear is avoided, and the brake performance is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of vehicle technology, and in particular, to a braking mechanism, a braking system and a vehicle. Background Art

[0002] The electronic parking brake system (EPB) transforms the traditional mechanical handbrake into an electronically controlled handbrake, and can also combine the parking brake technology with the service brake technology.

[0003] The braking mechanism of EPB includes: a driving mechanism, and a first piston and a second piston arranged on both sides of the brake disc. The driving mechanism can push the first piston and the second piston to move toward each other, so that the first piston and the second piston are locked with the brake disc of the vehicle to achieve braking.

[0004] However, when the brake disc receives different clamping forces from the first piston and the second piston, for example, one of the first piston and the second piston is in contact with the brake disc and the other is not, the brake disc only receives the clamping force from the first piston or the second piston, and the forces on both sides are uneven, causing eccentric wear on both sides of the brake disc. The side of the brake disc in contact with the piston wears more, which leads to inconsistent clamping forces on both sides and affects the braking effect. Summary of the invention

[0005] The embodiments of the present application provide a braking mechanism, a braking system and a vehicle, which solve the problem that the braking mechanism is prone to eccentric wear.

[0006] In order to achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0007] According to a first aspect of an embodiment of the present application, a braking mechanism is provided, comprising: a fixing portion, a driving mechanism, a first piston, a second piston and an elastic component; the first piston and the second piston are respectively arranged on both sides of a brake disc, and the first piston and the second piston are both transmission-connected to the driving mechanism, and the driving mechanism is connected to the fixing portion through the elastic component; the driving mechanism is used to drive the first piston to move in a first direction, and to drive the second piston to move in a second direction toward the brake disc; wherein the first direction and the second direction are opposite; the elastic component is used to drive the driving mechanism, the first piston and the second piston to move in the second direction when the brake disc contacts the first piston; or, the elastic component is used to drive the driving mechanism, the first piston and the second piston to move in the first direction when the brake disc contacts the second piston. Therefore, when the first piston or the second piston contacts and produces eccentric wear on the brake disc, the reaction force of the brake disc on the first piston or the second piston is transmitted to the driving mechanism through the first piston or the second piston in sequence, and then transmitted to the elastic component by the driving mechanism. The elastic component can drive the driving mechanism, the first piston and the second piston to move in opposite directions as a whole, so that the forces on both sides of the brake disc are balanced, thereby avoiding eccentric wear on the first piston or the second piston from contacting and producing eccentric wear on the brake disc and improving the braking performance.

[0008] In an optional implementation, the moving torque of the piston is less than the triggering threshold of the elastic component. When the first piston and the second piston are not in contact with the brake disc, the elastic component is in a compressed state. When there is a deviation in the distance between the first piston and the second piston and the brake disc, and after the first piston or the second piston contacts the brake disc, the contact force between the piston and the brake disc increases. When the contact force reaches a certain threshold and exceeds the triggering force of the elastic component, the first piston and the second piston will be pushed to move in the direction opposite to the contact force.

[0009] In an optional implementation, the drive mechanism includes: a transmission shaft and a first transmission assembly, the transmission shaft is drivingly connected to the output shaft of the motor, the motor is fixedly connected to the fixing portion, and the first transmission assembly is used to convert the rotational motion of the transmission shaft into linear motion and transmit it to the first piston. Thus, the transmission shaft of the drive mechanism is drivingly connected to the output shaft of the motor, so that motor drive can be realized, and the motor drive mechanism can be used in a parking brake mode.

[0010] In an optional implementation, a first guide portion is provided on the output shaft of the motor, and a first moving portion matching the first guide portion is provided on the transmission shaft. The first guide portion can drive the first moving portion to rotate with the transmission shaft, and the first moving portion can move along the first guide portion, and the extension direction of the first guide portion is parallel to the first direction. Thus, by providing the first guide portion and the first moving portion between the output shaft of the motor and the transmission shaft, the transmission connection between the transmission shaft and the output shaft of the motor can be achieved through the cooperation of the first guide portion and the first moving portion, so that the torque output by the motor can be transmitted to the transmission shaft. Furthermore, when the driving mechanism, the first piston and the second piston move relative to the fixed portion under the action of the elastic component, the transmission shaft can move relative to the output shaft of the motor with the driving mechanism.

[0011] In an optional implementation, the first transmission assembly includes: a first gear, a second gear, a first lead screw and a first lead screw nut; the first gear is sleeved on the transmission shaft, the second gear is sleeved on the first lead screw, the first gear and the second gear are meshed, the first lead screw nut is threadedly connected to the first lead screw, and the first piston is connected to the first lead screw nut; the first gear and the second gear are used to transmit the rotational motion of the transmission shaft to the first lead screw nut through the first lead screw, and the first lead screw nut is used to convert the rotational motion of the first lead screw into linear motion and drive the first piston to move. Thus, the first transmission assembly can convert the rotational motion of the transmission shaft into linear motion and transmit it to the first piston.

[0012] In an optional implementation, the brake mechanism further includes: a second screw drivingly connected to the transmission shaft, the second screw drivingly connected to the second piston, and the first screw and the second screw have opposite thread rotation directions. Thus, under the drive of the first screw and the second screw, the first piston and the second piston can move closer to each other to achieve braking or move away from each other to release wheel locking.

[0013] In an optional implementation, the brake mechanism further includes: a first housing, the transmission shaft is connected to the first housing via a first bearing, and the first lead screw is connected to the first housing via a second bearing. Thus, the first housing can be used to fix the transmission shaft and the first lead screw.

[0014] In an optional implementation, the first housing is connected to the fixing portion via the elastic component, so that the first housing can drive the driving mechanism to move relative to the fixing portion under the action of the elastic component.

[0015] In an optional implementation, the fixing portion includes: a second guide portion, the first shell is movably connected to the first shell through the second guide portion, the first shell can move relative to the fixing portion along the second guide portion, and the extension direction of the second guide portion is parallel to the first direction. Thus, by providing the second guide portion, the first shell can be prevented from floating in the fixing portion.

[0016] In an optional implementation, the drive mechanism includes: a hydraulic pipeline and a second cavity connected to the hydraulic pipeline, the first piston is arranged in the second cavity, and the first piston is used to move along the first direction when the hydraulic pipeline passes brake oil into the second cavity. Thus, the drive mechanism can realize hydraulic drive and realize service braking.

[0017] In an optional implementation, the fixing portion includes: a fourth guide portion, the first piston is disposed in the fourth guide portion, and the first piston can move along the fourth guide portion, thereby preventing the first piston from floating in the fourth guide portion.

[0018] In an optional implementation, the brake mechanism further includes: a second housing, the second housing is connected to the drive mechanism, the second housing is at least partially disposed in the fourth guide portion, and the second housing, the third guide portion and the first piston are surrounded by the second cavity. Thus, when the brake oil is introduced into the second cavity, the first piston can be pushed to move, thereby achieving braking.

[0019] In an optional implementation, the first lead screw nut includes: a third guide portion, the first piston includes: a second moving portion, the third guide portion can drive the second moving portion to rotate with the first lead screw nut, and the second moving portion can move along the third guide portion, and the extension direction of the third guide portion is parallel to the first direction. Thus, under the action of hydraulic oil, the first piston can move relative to the lead screw nut to achieve braking.

[0020] In an optional implementation, a first seal is provided between the third guide portion and the second housing; and a second seal is provided between the first piston and the third guide portion. Thus, leakage of brake fluid through the gap between the third guide portion and the second housing and the gap between the first piston and the third guide portion can be avoided, thereby improving the sealing performance.

[0021] In a second aspect of the embodiment of the present application, a brake system is provided, comprising a controller and the brake mechanism as described above, wherein the controller is electrically connected to the drive mechanism, and the controller is used to control the drive mechanism to drive the first piston and the second piston to approach or move away from the brake disc. Thus, the brake system adopts the brake mechanism to prevent eccentric wear of the brake disc and improve braking performance.

[0022] The third aspect of the embodiment of the present application provides a vehicle, comprising a wheel and the above-mentioned brake system, wherein the wheel is fixedly connected to the brake disc of the brake system. Thus, the vehicle adopts the above-mentioned brake system to prevent eccentric wear of the brake disc and improve braking performance.

[0023] An embodiment of the present application provides a braking mechanism, a braking system and a vehicle, wherein the braking mechanism includes: a fixing portion, a driving mechanism, a first piston, a second piston and an elastic component; the first piston and the second piston are respectively arranged on both sides of a brake disc, and the first piston and the second piston are both transmission-connected to the driving mechanism, and the driving mechanism is connected to the fixing portion via the elastic component; the driving mechanism is used to drive the first piston to move in a first direction, and to drive the second piston to move in a second direction toward the brake disc; wherein the first direction and the second direction are opposite.

[0024] In some embodiments, the driving mechanism includes: the driving mechanism includes: a transmission shaft, a first gear, a second gear, a first lead screw and a first lead screw nut. The transmission shaft is connected to the output shaft of the motor in a transmission manner, the motor is fixedly connected to the fixed portion, the first gear is sleeved on the transmission shaft, the second gear is sleeved on the first lead screw, the first gear and the second gear are meshed, the first lead screw nut is threadedly connected to the first lead screw, and the first piston is connected to the first lead screw nut; the first gear and the second gear are used to transmit the rotational motion of the transmission shaft to the first lead screw nut through the first lead screw, and the first lead screw nut is used to convert the rotational motion of the first lead screw into linear motion and drive the first piston to move. Thus, the driving mechanism can convert the rotational motion of the motor output shaft into linear motion and transmit it to the first piston, so that motor drive can be realized, and the motor driving mechanism can be used in the parking brake mode. The driving mechanism includes: a motor driving mechanism for the parking brake scene and a hydraulic driving mechanism for the driving brake scene.

[0025] In some embodiments, the driving mechanism includes: a hydraulic pipeline, and a second cavity connected to the hydraulic pipeline, the first piston is arranged in the second cavity, and the first piston is used to move along the first direction when the hydraulic pipeline passes brake oil into the second cavity. Thus, the driving mechanism can realize hydraulic drive and realize driving braking. The motor driving mechanism can drive the movement of the pistons on both sides by a motor to improve the driving efficiency, and can realize the braking function of the fixed caliper during driving.

[0026] The elastic component is used to drive the drive mechanism, the first piston and the second piston to move in the second direction when the brake disc contacts the first piston and causes eccentric wear; or, the elastic component is used to drive the drive mechanism, the first piston and the second piston to move in the first direction when the brake disc contacts the second piston and causes eccentric wear. Thus, in the service braking or parking braking scenario, when the first piston or the second piston contacts the brake disc and causes eccentric wear, the reaction force of the brake disc on the first piston or the second piston is sequentially transmitted to the drive mechanism through the first piston or the second piston in contact with the brake disc, and then transmitted to the elastic component by the drive mechanism. The elastic component undergoes elastic deformation driven by the reaction force, and then can drive the drive mechanism, the first piston and the second piston to move as a whole in the opposite direction of the eccentric wear, so that the forces on both sides of the brake disc are balanced, eccentric wear is avoided, and braking performance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of a vehicle;

[0028] Figure 2 A schematic diagram of the structure of a braking system provided in an embodiment of the present application;

[0029] Figure 3 It is a structural schematic diagram of a braking mechanism;

[0030] Figure 4 A schematic diagram of a module of a braking mechanism provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the structure of a braking mechanism provided in an embodiment of the present application;

[0032] Figure 6 for Figure 5 A schematic structural diagram of the first shell;

[0033] Figure 7 for Figure 5 A schematic diagram of the middle brake mechanism in the parking brake state;

[0034] Figure 8 for Figure 5 Schematic diagram of the middle brake mechanism in a state of eccentric wear;

[0035] Fig. 9 for Figure 5 Schematic diagram of the middle brake mechanism after releasing the eccentric wear state;

[0036] Fig.10 A schematic diagram of the structure of a braking mechanism provided in an embodiment of the present application;

[0037] Fig.11 for Fig.10A schematic diagram of the middle brake mechanism in a service braking state;

[0038] Fig.12 A flow chart of a control method for a braking mechanism provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0040] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0041] In addition, in the present application, directional terms such as "up", "down", "left", "right", "horizontal" and "vertical" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to the changes in the orientation of the components in the drawings.

[0042] In the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0043] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0044] The present application provides a braking system that can be applied to the control systems of vehicles such as smart cars, connected cars, new energy vehicles, and self-driving cars.

[0045] Figure 1 The schematic diagram of the structure of the vehicle provided in the embodiment of the present application. The vehicle may include a vehicle body 1, wheels 2 and a brake mechanism 100. The brake mechanism 100 may act on the wheels 2 to provide a braking force for the vehicle to stop the moving vehicle. It should be noted that: Figure 1 Some components included in the vehicle are only schematically shown, and the actual shapes, actual sizes, actual positions and actual configurations of these components are not subject to Figure 1 In some embodiments, the vehicle may further include a powertrain, a transmission system, and other devices, which are not described in detail herein.

[0046] Figure 2This is a system architecture diagram of an electronic mechanical braking system provided in an embodiment of the present application. Figure 2 As shown, the electronic mechanical braking system 10 includes a braking mechanism 100 and a control system 12. The control system 12 may include a pedal travel sensor 4, an electronic parking brake (EPB) button 5 and a controller 108. The pedal travel sensor 4 is connected to the pedal 3 of the vehicle, and the pedal travel sensor 4 and the electronic parking brake button 5 are both connected to the controller 108 signal. The controller 108 is connected to the braking mechanism 100.

[0047] The following combination Figure 2 The working process of the electronic mechanical brake system 10 is described as follows:

[0048] When the vehicle is in a driving state, when the user steps on the pedal 3, the pedal travel sensor 4 receives a signal and transmits it to the controller 108. The controller 108 receives the signal and controls the brake mechanism 100 to start the braking mode to achieve driving braking.

[0049] When the vehicle is in a flameout state, when the user presses the electronic parking brake system button 5, the brake signal is transmitted to the controller 108. The controller 108 receives the signal and controls the brake mechanism 100 to start the brake mode to implement the parking brake. In this way, when the vehicle is flameout, even if the driver forgets to pull the handbrake, the system will automatically complete the parking. When the vehicle starts, if the driver forgets to release the handbrake, the parking brake will be automatically released. When the vehicle starts on a slope, it will not roll back, making the vehicle more intelligent, simple, and safe, reducing the occurrence of accidents.

[0050] Braking mechanisms can be divided into hydraulic braking mechanisms and electronic mechanical braking mechanisms according to the braking method. Compared with hydraulic braking mechanisms, electronic mechanical braking mechanisms do not have brake fluid and have the advantages of fast response, reliable performance, safety and environmental protection. The EMB device (brake mechanism) is a mechanical structure that uses a wheel-end motor to drive a reducer, and then drives a certain rotational motion into a linear motion. It has the advantages of simple layout, fast response, and high efficiency. Therefore, it can better meet the development needs of automobiles in terms of safety and efficiency, especially the development needs of automobile electrification.

[0051] Figure 3 is a schematic diagram of the structure of a braking mechanism, such as Figure 3 As shown, the brake mechanism includes: a drive mechanism 13 and a piston 210. The drive mechanism 13 can push the piston to move, so that the piston 210 and the brake disc 211 are locked to achieve parking brake, and the locking can be released by reversing the motor.

[0052] However, in the above-mentioned brake mechanism, one motor drives one piston, which is prone to eccentric wear, and the brake mechanism cannot achieve floating adjustment.

[0053] To this end, the present application provides an improved braking mechanism. Figure 4 As shown, the brake mechanism 100 includes: a fixing portion 14 , a driving mechanism 13 , a first piston 210 , a second piston 212 and an elastic component 202 .

[0054] In some embodiments, the brake disc 211 is mounted on the hub of the wheel 2. The first piston 210 and the second piston 212 are respectively disposed on both sides of the brake disc 211, and the first piston 210 and the second piston 212 are both transmission-connected to the driving mechanism 13, and the driving mechanism 13 is used to drive the first piston 210 and the second piston 212 to approach each other to squeeze the brake disc 211.

[0055] One end of the elastic component 202 may be connected to the fixing portion 14 , and the other end thereof may be connected to the driving mechanism 13 .

[0056] In some embodiments, the fixing portion 14 is connected to the vehicle body 1 to provide a structurally stable connection.

[0057] In other embodiments, the fixing portion is a vehicle body 1 .

[0058] In some embodiments, a first caliper (not shown in the figure) is connected to a side of the first side wall 2101 facing the second side wall 2121, and a first friction surface is formed on the side facing the second side wall 2121. A second caliper (not shown in the figure) is fixedly connected to a side of the second side wall 2121 facing the first side wall 2101, and a second friction surface is formed on the side facing the first side wall 2101. A portion of the brake disc 211 is located between the first friction surface and the second friction surface. The first piston 210 and the second piston 212 can move relative to the brake disc 211, that is, the first piston 210 and the second piston 212 can drive the first caliper and the second caliper to move toward the brake disc 211.

[0059] In some embodiments, under the action of the driving mechanism 13, the first piston 210 may approach the brake disc 211 along a first direction, and the second piston 212 may approach the brake disc 211 along a second direction. The first direction is opposite to the second direction.

[0060] When at least one of the first piston 210 and the second piston 212 contacts the brake disc 211, the brake disc 211 receives a clamping force from the first direction and / or the second direction. If the clamping force in the first direction is different from the clamping force in the second direction, it is easy to cause eccentric wear on both sides of the brake disc 211, which in turn leads to inconsistent clamping force on both sides, affecting the braking effect.

[0061] In this embodiment, when at least one of the first piston 210 and the second piston 212 contacts the brake disc 211, for example, when the brake disc 211 contacts the first piston 210 and causes eccentric wear, the brake disc 211 receives a clamping force from a first direction, and the elastic component 202 can drive the driving mechanism 13 to move in the second direction, and the first piston 210 and the second piston 212 move accordingly, so that the forces on both sides of the brake disc 211 are consistent, thereby improving the braking performance.

[0062] Alternatively, when the brake disc 211 contacts and wears unevenly with the second piston 212, the brake disc 211 receives a clamping force from the second direction, and the elastic component 202 can drive the driving mechanism 13 to move in the first direction, and the first piston 210 and the second piston 212 move accordingly, so that the forces on both sides of the brake disc 211 are consistent, thereby improving the braking performance.

[0063] The braking mechanism provided in the embodiment of the present application has a driving mechanism 13 that is transmission-connected with the first piston 210 and the second piston 212, and the driving mechanism 13 is connected to the fixing portion 14 through an elastic component 202. When the first piston 210 or the second piston 212 contacts the brake disc 211 and produces eccentric wear, the reaction force of the brake disc 211 on the first piston 210 or the second piston 212 is transmitted to the driving mechanism 13 through the first piston 210 or the second piston 212 in turn, and is transmitted to the elastic component 202 by the driving mechanism 13. The elastic component 202 undergoes elastic deformation under the push of the reaction force, which can drive the driving mechanism 13, the first piston 210 and the second piston 212 to move as a whole in the opposite direction of the eccentric wear, so that the forces on both sides of the brake disc 211 are balanced, thereby avoiding eccentric wear and improving the braking performance.

[0064] The embodiment of the present application does not limit the structure of the first piston 210 and the second piston 212. In some embodiments, the first piston 210 includes a first side wall 2101, and the second piston 212 includes a second side wall 2121. The first side wall 2101 and the second side wall 2121 are arranged opposite to each other, and the first side wall 2101 and the second side wall 2121 are arranged along the x direction, and the first side wall 2101 and the second side wall 2121 are relatively fixed.

[0065] In some embodiments, continue to refer to Figure 4 The first piston 210 may further include a third side wall 2102 and a fourth side wall 2103 that are arranged opposite to each other along the y direction. The two ends of the first side wall 2101 are respectively connected to the third side wall 2102 and the fourth side wall 2103, so that the first piston 210 is generally frame-shaped as a whole, so that the third side wall 2102 and the fourth side wall 2103 are relatively fixed, and the overall structure is stable. The structure of the second piston 212 can refer to the first piston 210, and will not be repeated here.

[0066] The embodiment of the present application does not limit the structure of the elastic component 202. In some embodiments, the elastic component 202 may be an adjustment spring, the axis of which is parallel to the axis of the first piston 210 and the second piston 212. The adjustment spring may undergo elastic deformation, contraction or extension along the axis to drive the first housing 203 to move.

[0067] In some embodiments, the elastic component 202 includes: a first elastic component 2021 and a second elastic component 2022 , and the first elastic component 2021 and the second elastic component 2022 are symmetrically arranged on both sides of the first housing 203 with respect to the brake disc 211 .

[0068] Therefore, the elastic component 202 is symmetrically arranged with respect to the brake disc 211 , and can drive the first housing 203 to move along the axial direction.

[0069] In some embodiments, the moving torque of the piston is less than the triggering threshold of the elastic component 202. For example, when the first piston 210 and the second piston 212 are not in contact with the brake disc 211, the elastic component 202 is in a compressed state. There is a deviation in the distance between the first piston 210 and the second piston 212 and the brake disc 211, and after the first piston 210 or the second piston 212 contacts the brake disc 211, the contact force between the piston and the brake disc 211 increases. After the contact force reaches a certain threshold and exceeds the triggering force of the elastic component 202, the first piston 210 and the second piston will be pushed to move in the direction opposite to the contact force.

[0070] In some embodiments, the brake mechanism can realize parking brake and driving brake, wherein the drive mechanism 13 includes: a motor drive mechanism. The motor drive mechanism can be used for parking brake. When the vehicle is turned off, the user presses the button of the electronic parking brake system to transmit the brake signal to the controller, the controller receives the signal and controls the brake mechanism to start the braking mode, and the motor drive mechanism drives the first piston 210 and the second piston 212 to approach the brake disc 211 to realize parking brake.

[0071] Combine the following Figure 5 The structure of the motor drive mechanism and the fixing portion 14 will be described. Figure 5 As shown, the motor drive mechanism includes: a transmission shaft 104 and a first transmission assembly. The transmission shaft 104 is connected to the output shaft of the motor 101 through a reducer 102. The reducer 102 is used to reduce the speed and torque of the driving force output by the motor 101 and then output it to the transmission shaft 104.

[0072] In some embodiments, the motor 101 is fixedly connected to the fixing portion 14 , and the first transmission assembly is used to convert the rotational motion of the transmission shaft 104 into linear motion and transmit it to the first piston 210 .

[0073] Thus, the transmission shaft of the drive mechanism is in driving connection with the output shaft of the motor, so that motor drive can be realized, and the motor drive mechanism can be used in a parking brake mode.

[0074] The embodiment of the present application does not limit the connection method between the motor 101 and the fixing part 14 . In some embodiments, the fixing part 14 is provided with a pinion bearing 103 , for example, and the output shaft of the motor 101 is rotatably connected to the pinion bearing 103 .

[0075] In this embodiment, during parking braking, the torque of the motor 101 is transmitted to the transmission shaft 104. When eccentric wear occurs, the transmission shaft 104 moves axially relative to the fixed part 14 under the action of the elastic component 202, so that the transmission shaft 104 can rotate with the output shaft of the motor 101 and can move in the axial direction relative to the output shaft of the motor 101.

[0076] To this end, in some embodiments, a first guide portion 1021 is provided on the output shaft of the motor 101, and a first moving portion 1041 matching the first guide portion 1021 is provided on the transmission shaft 104. The first guide portion 1021 can drive the first moving portion 1041 to rotate along the transmission shaft 104, and the first moving portion 1041 can move along the first guide portion 1021, and the extension direction of the first guide portion 1021 is parallel to the first direction.

[0077] In this way, the transmission shaft 104 can be connected to the output shaft of the motor 101 through the cooperation of the first guide portion 1021 and the first moving portion 1041, so that the torque output by the motor 101 is transmitted to the transmission shaft 104. In addition, when the first housing 203 moves in the fixing portion 14, the transmission shaft 104 can move with the first housing 203 relative to the output shaft of the motor 101.

[0078] In some embodiments, the first guide portion 1021 may be a guide rail, and the first moving portion 1041 may be a bump that matches the guide rail.

[0079] In other embodiments, the first guide portion 1021 may be an internal spline, and the first moving portion 1041 may be an external spline. For example, the first end of the output shaft of the motor 101 may have a first mounting hole, the first mounting hole is arranged along a first direction, and the inner wall of the first mounting hole has an internal spline. The first end of the transmission shaft 104 can extend into the first mounting hole, and the outer wall of the first end of the transmission shaft 104 has an external spline that matches the internal spline. Thus, through the cooperation of the internal and external splines, the transmission shaft 104 can rotate with the output shaft of the motor 101, and can move relative to the output shaft of the motor 101 along the axial direction.

[0080] The present embodiment does not limit the structure of the fixing portion 14. In some embodiments, the fixing portion 14 is a shell, which is disposed outside the driving mechanism 13, the first piston 210 and the second piston 212 to protect the driving mechanism 13, the first piston 210 and the second piston 212.

[0081] For example, Figure 6 As shown, the fixing portion 14 includes three parts: a first fixing shell 201, a second fixing shell 216 and a third fixing shell 208, wherein the first fixing shell 201 is arranged on the right side of the driving mechanism 13, the second fixing shell 216 is arranged on the left side of the driving mechanism 13, and the third fixing shell 208 is arranged between the first fixing shell 201 and the second fixing shell 216, and is respectively connected to the first fixing shell 201 and the second fixing shell 216.

[0082] In some embodiments, the first fixed housing 201 includes a fifth side wall 2011, and the second fixed housing 216 includes a sixth side wall 2161. The fifth side wall 2011 and the sixth side wall 2161 are arranged opposite to each other along the x direction. The fifth side wall 2011 is connected to the first elastic component 202, and the sixth side wall 2161 is connected to the second elastic component.

[0083] The first fixed housing 201 further includes: a seventh side wall 2012 and an eighth side wall 2013 which are arranged opposite to each other along the y direction. The two ends of the fifth side wall 2011 are respectively connected to the first end of the seventh side wall 2012 and the first end of the eighth side wall 2013, so that the first fixed housing 201 is generally cylindrical or frame-shaped, so that the seventh side wall 2012 and the eighth side wall 2013 are relatively fixed and the overall structure is stable.

[0084] The second fixed housing 216 further includes: a ninth side wall 2162 and a tenth side wall 2163 which are arranged opposite to each other along the y direction. The two ends of the sixth side wall 2161 are respectively connected to the first end of the ninth side wall 2162 and the first end of the tenth side wall 2163, so that the second fixed housing 216 is generally cylindrical or frame-shaped as a whole, so that the ninth side wall 2162 and the tenth side wall 2163 are relatively fixed and the overall structure is stable.

[0085] The embodiment of the present application does not limit the shape of the third fixed housing 208. In some embodiments, the third fixed housing 208 can adopt a cylindrical or frame-shaped structure. For example, Figure 6 As shown, the third fixed housing 208 includes: an eleventh side wall 2081 , a twelfth side wall 2082 and a thirteenth side wall 2083 which are spaced apart along the y direction.

[0086] The first end of the eleventh side wall 2081 is connected to the second end of the seventh side wall 2012, and the second end of the eleventh side wall 2081 is connected to the second end of the ninth side wall 2162. The first end of the thirteenth side wall 2083 is connected to the second end of the eighth side wall 2013, and the second end of the thirteenth side wall 2083 is connected to the second end of the tenth side wall 2163.

[0087] The thirteenth side wall 2083 is provided with an opening, and the brake disc 211 is at least partially installed in the fixing portion 14 through the opening.

[0088] The eleventh side wall 2081 and the thirteenth side wall 2083 may be arranged in a cylindrical shape or a frame shape. The twelfth side wall 2082 is located in the area surrounded by the eleventh side wall 2081 and the thirteenth side wall 2083 .

[0089] The twelfth side wall 2082 and the thirteenth side wall 2083 may be arranged in a cylindrical shape or a frame shape.

[0090] In some embodiments, the first transmission assembly includes: a first gear 106, a second gear 206, a first lead screw 205 and a first lead screw nut 209. The first gear 106 is sleeved on the transmission shaft 104, the second gear 206 is sleeved on the first lead screw 205, the first gear 106 and the second gear 206 are meshed, the first lead screw nut 209 is threadedly connected to the first lead screw 205, and the first piston 210 is connected to the first lead screw nut 209.

[0091] In order to realize the connection between the driving mechanism and the fixed part 14, in some embodiments, the brake mechanism further includes a first housing 203, the first housing 203 is arranged in the fixed part 14, the first piston 210 and the second piston 212 are connected to the driving mechanism in a transmission manner, the driving mechanism is connected to the first housing 203, and the first housing 203 is connected to the fixed part 14 through the elastic component 202, so that the first piston 210 and the second piston 212 are movably installed in the fixed part 14. In this way, when the first piston 210 or the second piston 212 contacts with the brake disc 211 and produces eccentric wear, the reaction force of the brake disc 211 on the first piston 210 or the second piston 212 is transmitted to the elastic component 202 through the driving mechanism 13 and the first housing 203 in sequence, and the elastic component 202 can drive the first housing 203 to move in the second direction under the action of the reaction force, and the driving mechanism 13, the first piston 210 and the second piston 212 move accordingly, so that the forces on both sides of the brake disc 211 are consistent, thereby improving the braking performance.

[0092] In some embodiments, the fixing portion 14 also includes: a second guide portion 2010, the first shell 203 is movably connected to the fixing portion 14 through the second guide portion 2010, the first shell 203 can move relative to the fixing portion 14 along the second guide portion 2010, and the extension direction of the second guide portion 2010 is parallel to the first direction.

[0093] Therefore, by providing the second guide portion 2010 , the first housing 203 can drive the first piston 210 and the second piston 212 to move along the second guide portion 2010 , thereby preventing the first housing 203 from floating in other directions within the fixing portion 14 .

[0094] In some embodiments, the second guide portion 2010 can be a guide rail, and a protrusion is provided on the first shell 203, and the protrusion matches the guide rail, or the second guide portion 2010 is a first spline, and a second spline is provided on the first shell 203, and the first spline matches the second spline.

[0095] In other embodiments, the shape of the first shell 203 matches the inner wall of the fixing portion 14 . For example, the first shell 203 may be a cylindrical structure, and the fixing portion 14 may have a tubular structure, which is sleeved on the first shell 203 and can then slide left and right along the fixing portion 14 .

[0096] In some embodiments, the first transmission assembly is connected to the first housing 203 .

[0097] Combine the following Figure 5 The connection method between the first housing 203 and the first transmission assembly is described.

[0098] like Figure 5 As shown, Figure 5 As shown, the transmission shaft 104 is connected to the first housing 203 via the first bearing 105 , and the first lead screw 205 is connected to the first housing 203 via the second bearing 204 .

[0099] The first bearing 105 can be fixedly disposed on the first housing 203, and the axis of the first bearing 105 is coaxially disposed with the axis of the transmission shaft 104, and the transmission shaft 104 is rotatably assembled in the first bearing 105. The second bearing 204 can be fixedly disposed on the first housing 203, and the axis of the second bearing 204 is coaxially disposed with the axis of the first lead screw 205, and the first lead screw 205 is rotatably assembled in the second bearing 204.

[0100] The first housing 203 may be provided with a first bearing chamber and a second bearing chamber, the first bearing 105 may be provided in the first bearing chamber, the second bearing 204 may be provided in the second bearing chamber, and the outer ring of the first bearing 105 is fixedly connected to the inner wall of the first bearing chamber, the inner ring of the first bearing 105 is rotatably connected to the transmission shaft 104, the outer ring of the second bearing 204 is fixedly connected to the inner wall of the second bearing chamber, and the inner ring of the second bearing 204 is rotatably connected to the first screw 205.

[0101] During parking braking, the controller 108 controls the motor 101 to work, and the torque output by the motor 101 is transmitted to the transmission shaft 104 through the reducer 102, and then transmitted to the first gear 106 through the transmission shaft 104. The first gear 106 transmits the rotational motion of the transmission shaft 104 to the meshing second gear 206, driving the transmission shaft 104, the first gear 106 and the second gear 206 to rotate, and the second gear 206 drives the first screw 205 to rotate. The first screw nut 209 is used to convert the rotational motion of the first screw 205 into linear motion, pushing the first screw nut 209 to move along the first screw 205, and the first screw nut 209 drives the first piston 210 to move.

[0102] Similarly, under the action of the transmission shaft 104, the second lead screw 213 rotates accordingly, and the second lead screw nut is used to convert the rotational motion of the second lead screw 213 into linear motion, pushing the second lead screw nut to move along the second lead screw 213, and the second lead screw nut drives the second piston 212 to move.

[0103] Figure 7 for Figure 5 Schematic diagram of the brake mechanism in the parking brake state, as shown in Figure 7 As shown, the first piston 210 and the second piston 212 are both in contact with the brake disc 211 to achieve parking brake.

[0104] In some embodiments, the thread rotation directions of the first screw 205 and the second screw 213 are opposite, for example, the first screw 205 is right-handed and the second screw is left-handed. The first screw 205 and the second screw 213 respectively drive the corresponding screw nuts forward, and then push the first piston 210 and the second piston 212 forward respectively, to achieve parking braking.

[0105] In order to prevent the first piston 210 from shaking along the y direction, a guide portion may be provided in the first housing to limit the movement of the first piston 210 in the y direction.

[0106] In some embodiments, the third fixed housing 208 may serve as a guide portion, and the first piston 210 is disposed in the third fixed housing 208 , and the first piston 210 may be able to move along the third fixed housing 208 .

[0107] The shape of the first piston 210 matches the inner wall of the third fixed shell 208 . For example, the first piston 210 may be a columnar structure, and the third fixed shell 208 may be a tubular structure, which is sleeved on the first shell 203 and can slide left and right along the fixed portion 14 .

[0108] In some embodiments, see Figure 8 During the parking brake process, when there is a deviation in the distance between the first piston 210 and the second piston 212 and the brake disc, for example, when the second piston 212 contacts the brake disc 211 and the first piston 210 does not contact the brake disc 211, the contact force F1 between the second piston 212 and the brake disc 211 increases under the drive of the motor 101. After the contact force F1 reaches a certain threshold and exceeds the trigger force of the elastic component 202, the reaction force of the brake disc on the second piston 212 is transmitted to the elastic component 202 through the drive mechanism 13 and the fourth housing 215 in sequence. The elastic component 202 can drive the fourth housing 215 to move in the second direction, and the drive mechanism 13, the first piston 210 and the second piston 212 move accordingly. That is, the reaction force of the brake disc 211 will push the portion in the dotted box in the figure to move in the M direction. At this time, the fourth housing 215 moves in the M direction in the fixing portion 14, and the transmission shaft 104 can move in the M direction relative to the output shaft of the motor 101 along with the first housing 203.

[0109] exist Figure 8 Before the portion in the dotted line frame moves in the direction M, the size of the first elastic component is d1, the size of the second elastic component is d2, and the size of the transmission shaft 104 matching the output shaft of the motor 101 is L1.

[0110] like Fig. 9 As shown, after the portion in the dotted frame moves in the direction M to the equilibrium position, the size of the first elastic component is d3, the size of the second elastic component is d4, and the size of the transmission shaft 104 matching the output shaft of the motor 101 is L2, wherein d3 is greater than d1, d4 is less than d2, and L2 is less than L1. In this way, after the entire dotted frame moves in the direction M, the first piston 210 contacts the brake disc 211 to achieve simultaneous braking on both sides. During this process, the contact pressures of the first piston 210 and the second piston 212 with the brake disc 211 are substantially the same, which can be equal to the start threshold of the elastic component 202, and bilateral braking can be well achieved, thereby eliminating the influence of eccentric wear in parking brakes and the problem of large deviation in the parking brake force of the dual parking system, so that the forces on both sides of the brake disc 211 are consistent, thereby improving the braking performance.

[0111] in, Figure 8 , Fig. 9Taking the eccentric wear caused by the second piston 212 contacting with the brake disc 211 as an example, when the eccentric wear occurs when the first piston 210 contacts with the brake disc 211, the modulation process of the elastic component can refer to the above description, which will not be repeated here.

[0112] The braking mechanism provided in the embodiment of the present application can drive the first piston 210 and the second piston 212 to move when the forces on both sides of the brake disc 211 are uneven by setting the elastic component 202, so that the forces on both sides of the brake disc 211 are balanced, thereby avoiding eccentric wear and improving the braking performance.

[0113] Combine the following Fig.10 The structure of the hydraulic drive mechanism is described below. Fig.10 As shown, the driving mechanism also includes: a hydraulic driving mechanism, which can be used for driving brakes. During driving, when the user steps on the pedal, the pedal travel sensor receives a signal and transmits it to the controller, the controller receives the signal, and controls the brake mechanism to start the braking mode, and the hydraulic driving mechanism 13 drives the first piston 210 and the second piston 212 to approach the brake disc 211 to achieve driving brakes.

[0114] See also Fig.10 The hydraulic drive mechanism includes: a hydraulic pipeline, and the braking mechanism also includes: a second housing 207, and the second housing 207 is connected to the first housing 203.

[0115] In some embodiments, the second shell 207 is partially located in the third fixed shell 208, and the second shell 207, the first piston 210, the first screw nut 209 and the third fixed shell 208 are arranged to form a first cavity, the first cavity is connected to the hydraulic pipeline, and the first piston 210 is used to move along the first screw nut 209 when the hydraulic pipeline introduces brake oil into the first cavity.

[0116] In some embodiments, Fig.10 , Fig.11 As shown, a through hole 2090 is provided in the first lead screw nut 209, and when the hydraulic pipeline passes brake oil into the first cavity, the brake oil can enter the gap between the first lead screw nut 209 and the first piston 210 through the through hole 2090, pushing the first piston 210 to move along the first lead screw nut 209.

[0117] In some embodiments, the braking mechanism further includes: a third housing 214 and a fourth housing 215 , the fourth housing 215 is connected to the transmission mechanism, and the third housing 214 and the fourth housing 215 are connected.

[0118] In some embodiments, the third shell 214 is partially located in the third fixed shell 208, and the third shell 214, the second piston 212 and the third fixed shell 208 are arranged to form a second cavity, and the second cavity is connected to the hydraulic pipeline. The second piston 212 is used to move along the second screw nut when the hydraulic pipeline introduces brake oil into the second cavity.

[0119] In some embodiments, the hydraulic drive mechanism further includes: a first solenoid valve 301 , a first hydraulic pipeline 304 and a second hydraulic pipeline 305 .

[0120] The first solenoid valve 301 is connected to the inner cavity of the first piston 210 through the first hydraulic pipeline 304, and the hydraulic oil can push the first piston 210 to move. The first solenoid valve 301 is connected to the inner cavity of the second piston 212 through the second hydraulic pipeline 305, and the hydraulic oil can push the second piston 212 to move.

[0121] In some embodiments, the first solenoid valve 301 is connected to the controller 108. When the parking brake is applied, the controller 108 responds to the brake signal and introduces hydraulic oil into the inner cavity of the first piston 210 and the inner cavity of the second piston 212 through the first solenoid valve 301 to push the first piston 210 and the second piston 212 to move.

[0122] In some embodiments, the first solenoid valve 301 is a normally open solenoid valve. For example, when the driver steps on the brake pedal, under normal conditions, the controller 108 can control the drive pump to generate hydraulic pressure, and at the same time connect the oil circuits between the first hydraulic line 304 and the internal cavity of the first piston 210, and between the second hydraulic line 305 and the internal cavity of the second piston 212, so as to provide the hydraulic pressure generated by the drive pump to the wheel brake, so that the wheel brake performs braking. When the power is off, the first solenoid valve 301 is in an open state due to the power off, and the oil circuits between the first hydraulic line 304 and the internal cavity of the first piston 210, and between the second hydraulic line 305 and the internal cavity of the second piston 212 are connected. When the user steps on the brake pedal, the hydraulic pressure generated by the brake pedal is provided to the hydraulic drive mechanism.

[0123] In some embodiments, the hydraulic drive mechanism further includes: an oil pot 302, a second solenoid valve 303, and a pressure sensor 107. The oil pot 302 is connected to the hydraulic pipeline through the second solenoid valve 303, the second solenoid valve 303 and the first solenoid valve 301 are connected to the controller 108 through a signal line, and the pressure sensor 107 is connected to the hydraulic pipeline. The pressure sensor 107 is used to measure the pressure of the hydraulic pipeline and feed back the signal to the controller 108.

[0124] In some embodiments, the second solenoid valve 303 is a normally closed solenoid valve. When power is supplied, the normally open solenoid valve is in an open state due to power supply, thereby connecting the oil circuit between the brake mechanism and the oil tank 302 .

[0125] In this way, the controller 108 can control the second solenoid valve 303 to open or close according to the pressure signal detected by the pressure sensor 107. For example, when the controller 108 determines that the hydraulic pressure is insufficient according to the pressure signal detected by the pressure sensor 107, the second solenoid valve 303 can be controlled to open so as to replenish the brake oil into the hydraulic pipeline through the oil pot 302. When the controller 108 determines that the hydraulic pressure is too large according to the pressure signal detected by the pressure sensor 107, the second solenoid valve 303 can be controlled to open so that the excess brake oil in the hydraulic pipeline flows to the oil pot 302.

[0126] In some embodiments, the first lead screw nut 209 includes: a fourth guide portion 2091, and the first piston 210 includes: a second moving portion 2100. The fourth guide portion 2091 can drive the second moving portion 2100 to rotate with the first lead screw nut 209, and the second moving portion 2100 can move along the fourth guide portion 2091, and the extension direction of the fourth guide portion 2091 is parallel to the first direction.

[0127] In this way, the transmission connection between the first lead screw nut 209 and the first piston 210 can be realized through the cooperation of the fourth guide portion 2091 and the second moving portion 2100. During parking braking, the torque output by the motor 101 can be transmitted to the first piston 210 through the first lead screw nut 209. During service braking, brake oil is introduced into the first cavity, and the first piston 210 is pushed by the brake oil and can move along the fourth guide portion 2091.

[0128] In some embodiments, the fourth guide portion 2091 may be a guide rail, and the second moving portion 2100 may be a bump that matches the guide rail.

[0129] In other embodiments, the fourth guide portion 2091 may be an internal spline, and the second moving portion 2100 may be an external spline. For example, the first piston 210 may have a second mounting hole, the second mounting hole is arranged along the first direction, and the inner wall of the second mounting hole has an internal spline. The first lead screw nut 209 may extend into the second mounting hole, and the outer wall of the first lead screw nut 209 has an external spline matching the internal spline.

[0130] In some embodiments, during the service braking process, when there is a deviation in the distance between the first piston 210 and the second piston 212 and the brake disc 211, for example, when the second piston 212 contacts the brake disc 211 and the first piston 210 does not contact the brake disc 211, the contact force between the second piston 212 and the brake disc 211 increases under the drive of the hydraulic drive mechanism. After the contact force reaches a certain threshold and exceeds the trigger force of the elastic component 202, the reaction force of the brake disc 211 on the second piston 212 is transmitted to the elastic component 202 through the drive mechanism and the third housing 214 in sequence. The elastic component 202 can drive the third housing 214 to move in the second direction, and the drive mechanism, the first piston 210 and the second piston 212 move accordingly. That is, the reaction force of the brake disc 211 will push the part of the fixing part 14 to move in the direction opposite to the contact force. At this time, the transmission shaft 104 can move with the third housing 214 relative to the output shaft of the motor 101.

[0131] In this way, after part of the fixed part 14 moves, the first piston 210 contacts the brake disc 211 to achieve simultaneous braking on both sides. During this process, the contact pressures of the first piston 210 and the second piston 212 with the brake disc 211 are basically the same, which can be equal to the starting threshold of the adjusted elastic component 202. This can well achieve bilateral braking and eliminate the influence of eccentric wear in parking brakes and the problem of large deviation in parking brake force of the dual parking system, so that the forces on both sides of the brake disc 211 are consistent, thereby improving braking performance.

[0132] The above embodiment is described by taking the case where the second piston 212 contacts and wears the brake disc 211 as an example. When the first piston 210 contacts and wears the brake disc 211, the modulation process of the elastic component can refer to the above description and will not be repeated here.

[0133] The braking mechanism provided in the embodiment of the present application can drive the first piston 210 and the second piston 212 to move when the forces on both sides of the brake disc 211 are uneven by setting the elastic component 202, so that the forces on both sides of the brake disc 211 are balanced, thereby avoiding eccentric wear and improving the braking performance.

[0134] In some embodiments, in order to prevent the brake oil in the second cavity from leaking, a seal may be provided between the components surrounding the second cavity. For example, a first seal 221 is provided between the second housing 207 and the first lead screw 205, and between the fourth housing 215 and the second lead screw 213. In this way, the brake oil can be prevented from leaking from the gap between the second housing 207 and the first lead screw 205, and between the fourth housing 215 and the second lead screw 213.

[0135] For example, a second seal 222 is provided between the second housing 207 and the third fixed housing 208, and between the fourth housing 215 and the third fixed housing 208. In this way, the brake oil can be prevented from leaking from the gap between the second housing 207 and the third fixed housing 208, and between the fourth housing 215 and the third fixed housing 208.

[0136] For example, a third sealing member 224 is provided between the first piston 210 and the third fixed housing 208. In this way, leakage of the brake fluid from the gap between the first piston 210 and the third fixed housing 208 can be avoided.

[0137] In other embodiments, a fourth seal 223 may be provided between the first fixed shell 201 and the third fixed shell 208 and between the second fixed shell 216 and the third fixed shell 208 to prevent external impurities from entering the fixed portion 14 and better protect the internal structure of the fixed portion 14.

[0138] An embodiment of the present application provides a braking mechanism, a braking system and a vehicle, wherein the braking mechanism includes: a fixing portion, a driving mechanism, a first piston, a second piston and an elastic component; the first piston and the second piston are respectively arranged on both sides of a brake disc, and the first piston and the second piston are both transmission-connected to the driving mechanism, and the driving mechanism is connected to the fixing portion via the elastic component; the driving mechanism is used to drive the first piston to move in a first direction, and to drive the second piston to move in a second direction toward the brake disc; wherein the first direction and the second direction are opposite.

[0139] In some embodiments, the driving mechanism includes: the driving mechanism includes: a transmission shaft, a first gear, a second gear, a first lead screw and a first lead screw nut. The transmission shaft is connected to the output shaft of the motor in a transmission manner, the motor is fixedly connected to the fixed portion, the first gear is sleeved on the transmission shaft, the second gear is sleeved on the first lead screw, the first gear and the second gear are meshed, the first lead screw nut is threadedly connected to the first lead screw, and the first piston is connected to the first lead screw nut; the first gear and the second gear are used to transmit the rotational motion of the transmission shaft to the first lead screw nut through the first lead screw, and the first lead screw nut is used to convert the rotational motion of the first lead screw into linear motion and drive the first piston to move. Thus, the driving mechanism can convert the rotational motion of the motor output shaft into linear motion and transmit it to the first piston, so that motor drive can be realized, and the motor driving mechanism can be used in the parking brake mode. The driving mechanism includes: a motor driving mechanism for the parking brake scene and a hydraulic driving mechanism for the driving brake scene.

[0140] In some embodiments, the driving mechanism includes: a hydraulic pipeline, and a second cavity connected to the hydraulic pipeline, the first piston is arranged in the second cavity, and the first piston is used to move along the first direction when the hydraulic pipeline passes brake oil into the second cavity. Thus, the driving mechanism can realize hydraulic drive and realize driving braking. The motor driving mechanism can drive the movement of the pistons on both sides by a motor to improve the driving efficiency, and can realize the braking function of the fixed caliper during driving.

[0141] The elastic component is used to drive the drive mechanism, the first piston and the second piston to move in the second direction when the brake disc contacts the first piston and causes eccentric wear, or the elastic component is used to drive the drive mechanism, the first piston and the second piston to move in the first direction when the brake disc contacts the second piston and causes eccentric wear. Therefore, in the driving braking or parking braking scenario, when the first piston or the second piston contacts the brake disc and causes eccentric wear, the reaction force of the brake disc on the first piston or the second piston is successively transmitted to the drive mechanism through the first piston or the second piston in contact with the brake disc, and then transmitted to the elastic component by the drive mechanism. The elastic component undergoes elastic deformation driven by the reaction force, and then can drive the drive mechanism, the first piston and the second piston to move as a whole in the opposite direction of the eccentric wear, so that the forces on both sides of the brake disc are balanced, eccentric wear is avoided, and the braking performance is improved.

[0142] In some embodiments, the present application also provides a method for controlling a braking mechanism. Fig.12 As shown, the method comprises the following steps:

[0143] S101. Control the corresponding driving mechanism to work according to the user's braking instruction.

[0144] In some embodiments, before executing user instructions, a system check may also be performed, for example, the status of controllers, motors, hydraulic units, etc. may be checked to determine system safety and functional selectivity, and the pressure sensor may be calibrated and the motor angle sensor may be initialized and calibrated.

[0145] The user's instructions include: a service brake instruction obtained by the controller when the user steps on the pedal, and a parking brake instruction obtained by the controller when the user presses the button of the electronic parking brake system.

[0146] In some embodiments, a corresponding operating mode may be selected according to a user's braking instruction.

[0147] The working modes of the brake mechanism include: parking brake mode and service brake mode.

[0148] The controlling of the corresponding driving mechanism according to the user's braking instruction comprises:

[0149] When the user steps on the pedal, the pedal travel sensor receives a signal and transmits it to the controller. The controller receives the signal and controls the brake mechanism to start the service brake mode.

[0150] Among them, in the parking brake mode, the controller 108 controls the motor 101 to work, and the torque output by the motor 101 is transmitted to the transmission shaft 104 through the reducer 102, and then transmitted to the first gear 106 through the transmission shaft 104. The first gear 106 transmits the rotational motion of the transmission shaft 104 to the meshing second gear 206, driving the transmission shaft 104, the first gear 106 and the second gear 206 to rotate, and the second gear 206 drives the first screw 205 to rotate. The first screw nut 209 is used to convert the rotational motion of the first screw 205 into linear motion, pushing the first screw nut 209 to move along the first screw 205, and the first screw nut 209 drives the first piston 210 to move.

[0151] Similarly, under the action of the transmission shaft 104, the second lead screw 213 rotates accordingly, and the second lead screw nut is used to convert the rotational motion of the second lead screw 213 into linear motion, pushing the second lead screw nut to move along the second lead screw 213, and the second lead screw nut drives the second piston 212 to move.

[0152] Alternatively, when the user presses the button of the electronic parking brake system, a braking signal is transmitted to the controller, and the controller receives the signal and controls the braking mechanism to start the parking brake mode.

[0153] In the service braking mode, the controller 108 controls the hydraulic drive mechanism to drive the hydraulic oil into the cavities in the first piston 210 and the second piston 212 to push the first piston 210 and the second piston 212 to move.

[0154] S102. Obtain the real-time status of the braking mechanism through a sensor.

[0155] In some embodiments, the sensors include: a pressure sensor for a hydraulic drive mechanism, and a motor angle sensor for a motor drive mechanism.

[0156] The real-time signal includes: the pressure of the hydraulic pipeline acquired by the pressure sensor in real time, and the rotation angle of the motor 101 acquired by the motor angle sensor in real time.

[0157] S103. When the real-time state acquired by the sensor is consistent with the target state, the driving mechanism is turned off.

[0158] In some embodiments, obtaining a real-time signal of the braking mechanism through a sensor, and closing the driving mechanism when the real-time signal is consistent with the target signal, includes:

[0159] The controller obtains the rotation angle of the motor 101 through the motor angle sensor, and compares the motor rotation angle obtained by the motor angle sensor with the target angle. When the motor rotation angle is consistent with the target angle, the controller controls the motor to stop working.

[0160] Alternatively, the controller obtains the pressure of the hydraulic pipeline through a pressure sensor, and compares the pipeline pressure obtained by the pressure sensor with the target pressure. When the pipeline pressure is consistent with the target pressure, the solenoid valve is controlled to close.

[0161] In this way, electronic parking brake can be realized. When the vehicle is turned off, even if the driver forgets to pull the handbrake, the system will automatically complete the parking. When the vehicle starts, if the driver forgets to release the handbrake, the parking brake will be automatically released. The vehicle will not roll back when starting on a slope, making the vehicle more intelligent, simple and safe, reducing the occurrence of accidents.

[0162] The electronic parking system can adopt the above-mentioned brake mechanism, and by providing an elastic component, it can drive the first piston and the second piston to move when the forces on both sides of the brake disc are uneven, so that the forces on both sides of the brake disc are balanced, avoiding eccentric wear and improving braking performance.

[0163] An embodiment of the present application also provides a controller, which may be a vehicle controller, for example, a vehicle brake controller, which may be used to execute the above-mentioned brake control method, which may enable the piston to contact the brake disc to achieve vehicle braking.

[0164] It is understandable that, in order to realize the functions of any of the above-mentioned embodiments, the braking system includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0165] The embodiment of the present application can divide the braking system into functional modules. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation.

[0166] It should also be understood that each module in the braking system can be implemented in software and / or hardware form, without specific limitation. In other words, the electronic device is presented in the form of functional modules. The "module" here can refer to a specific application integrated circuit ASIC, a circuit, a processor and memory that executes one or more software or firmware programs, an integrated logic circuit, and / or other devices that can provide the above functions.

[0167] In an optional manner, when data transmission is implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is implemented in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a digital video disk (DVD)), or a semiconductor medium (e.g., a solid state disk (SSD)), etc.

[0168] The steps of the method or algorithm described in conjunction with the embodiments of the present application may be implemented in hardware or by a processor executing software instructions. The software instructions may be composed of corresponding software modules, and the software modules may be stored in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium may also be a component of the processor. The processor and the storage medium may be located in an ASIC. In addition, the ASIC may be located in an electronic device. Of course, the processor and the storage medium may also exist in a braking system as discrete components.

[0169] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A braking mechanism, characterized in that: include: A fixing portion (14), a driving mechanism (13), a first piston (210), a second piston (212) and an elastic component (202); The first piston (210) and the second piston (212) are respectively arranged on both sides of the brake disc (211), and the first piston (210) and the second piston (212) are both transmission-connected to the driving mechanism (13), and the driving mechanism (13) is connected to the fixing part (14) via the elastic component (202); The driving mechanism (13) is used to drive the first piston (210) to move along a first direction, and to drive the second piston (212) to move toward the brake disc (211) along a second direction; wherein the first direction and the second direction are opposite; The elastic component (202) is used to drive the driving mechanism (13), the first piston (210) and the second piston (212) to move in the second direction when the brake disc (211) contacts the first piston (210); Alternatively, the elastic component (202) is used to drive the driving mechanism (13), the first piston (210) and the second piston (212) to move in the first direction when the brake disc (211) contacts the second piston (212).

2. The brake mechanism according to claim 1, characterized in that: The driving mechanism (13) comprises: a transmission shaft (104) and a first transmission assembly, wherein the transmission shaft (104) is connected to the output shaft of the motor (101), the motor (101) is fixedly connected to the fixing portion (14), and the first transmission assembly is used to convert the rotational motion of the transmission shaft (104) into linear motion and transmit it to the first piston (210).

3. The brake mechanism according to claim 2, characterized in that: A first guide portion (1021) is provided on the output shaft of the motor (101), and a first moving portion (1041) matching the first guide portion (1021) is provided on the transmission shaft (104); the first guide portion (1021) can drive the first moving portion (1041) to rotate along with the transmission shaft (104), and the first moving portion (1041) can move along the first guide portion (1021); and the extension direction of the first guide portion (1021) is parallel to the first direction.

4. The brake mechanism according to claim 2 or 3, characterized in that: The first transmission assembly comprises: a first gear (106), a second gear (206), a first lead screw (205) and a first lead screw nut (209); The first gear (106) is sleeved on the transmission shaft (104), the second gear (206) is sleeved on the first lead screw (205), the first gear (106) and the second gear (206) are meshed, the first lead screw nut (209) is threadedly connected to the first lead screw (205), and the first piston (210) is connected to the first lead screw nut (209); The first gear (106) and the second gear (206) are used to transmit the rotational motion of the transmission shaft (104) to the first screw nut (209) through the first screw (205); the first screw nut (209) is used to convert the rotational motion of the first screw (205) into linear motion and drive the first piston (210) to move.

5. The brake mechanism according to claim 4, characterized in that: The braking mechanism further comprises: a second lead screw (213) drivingly connected to the transmission shaft (104), the second lead screw (213) drivingly connected to the second piston (212), and the first lead screw (205) and the second lead screw (213) having opposite thread rotation directions.

6. The brake mechanism according to claim 4 or 5, characterized in that: The braking mechanism further comprises: a first housing (203); the transmission shaft (104) is connected to the first housing (203) via a first bearing (105); and the first lead screw (205) is connected to the first housing (203) via a second bearing (204).

7. The brake mechanism according to claim 6, characterized in that: The first shell (203) is connected to the fixing portion (14) via the elastic component (202).

8. The brake mechanism according to claim 7, characterized in that: The fixing portion (14) comprises: a second guide portion (2010); the first shell (203) is movably connected to the fixing portion (14) via the second guide portion (2010); the first shell (203) can move relative to the fixing portion (14) along the second guide portion (2010); and the extension direction of the second guide portion (2010) is parallel to the first direction.

9. The brake mechanism according to any one of claims 1 to 8, characterized in that: The driving mechanism (13) comprises: a hydraulic pipeline and a second cavity connected to the hydraulic pipeline, the first piston (210) is arranged in the second cavity, and the first piston (210) is used to move along the first direction when brake oil is introduced into the second cavity from the hydraulic pipeline.

10. The brake mechanism according to claim 9, characterized in that: The driving mechanism (13) comprises: a third guide portion (2091), the first piston (210) is sleeved on the third guide portion (2091), and the first piston (210) can move along the third guide portion (2091), and the extension direction of the third guide portion (2091) is parallel to the first direction.

11. The brake mechanism according to claim 9 or 10, characterized in that: The fixing portion (14) comprises a fourth guide portion, the first piston (210) is arranged in the fourth guide portion, the first piston (210) is movable along the fourth guide portion, and the extension direction of the fourth guide portion is parallel to the first direction.

12. The brake mechanism according to claim 11, characterized in that: The braking mechanism further comprises: a second shell (207), the second shell (207) being connected to the driving mechanism (13), the second shell (207) being at least partially disposed in the fourth guide portion, and the second shell (207), the fourth guide portion and the first piston (210) forming the second cavity.

13. The brake mechanism according to claim 11 or 12, characterized in that: A first sealing member is provided between the fourth guide portion and the second housing (207); and a second sealing member is provided between the first piston (210) and the fourth guide portion.

14. A braking system, characterized in that: It comprises a controller and a braking mechanism as described in any one of claims 1 to 13, wherein the controller is electrically connected to the driving mechanism (13), and the controller is used to control the driving mechanism (13) to drive the first piston (210) and the second piston (212) to approach or move away from the brake disc (211).

15. A vehicle, characterized in that: It comprises a wheel and a braking system as claimed in claim 14, wherein the wheel is fixedly connected to the brake disc (211) of the braking system.

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