Electronic mechanical brake

Abstract

The invention discloses an electronic mechanical brake which comprises an actuator and a caliper assembly, the actuator comprises a circuit board and a motor assembly, and the circuit board is electrically connected with a shell of the motor assembly or the caliper assembly to form a grounding protection structure with an electromagnetic compatibility improving function. The electronic mechanical brake is reasonable in structural design, a smaller reference loop can be formed through connection of the circuit board and the motor assembly or the caliper body assembly, the electromagnetic compatibility function of an electronic mechanical brake system is improved, collection of signals at the end of the circuit board is facilitated, and the performance of the circuit board is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of braking systems, and in particular to an electromechanical brake. Background Art

[0002] With the electrification transformation of vehicles, the wire-controlled braking system has gradually become a major development trend in the automotive industry. As one of them, the electro-mechanical braking (EMB) system adopts the form of direct drive by a wheel-end motor. Through a motion conversion mechanism, the torque and rotational motion of the motor are converted into the linear motion of a translation member, which pushes the brake pads to clamp the brake disc, thereby obtaining braking force, and has the advantages of simple layout, fast response, high efficiency, etc.

[0003] The electro-mechanical braking (EMB) system is a new technical field of braking systems, and its structural functions are still continuously maturing; for example, the electromagnetic compatibility function (EMC) of the existing electro-mechanical braking (EMB) system and the anti-interference ability of the circuit board are limited, and signal interference problems will occur.

[0004] For example, a wire-controlled automotive electronic brake caliper structure disclosed in Chinese Patent CN220930029U; includes a reduction mechanism, one end of the motor is connected to one end of the reduction mechanism, the other end of the reduction mechanism is synchronously connected to the rotating member in the lead screw piston assembly, and the reduction mechanism is connected to the rotating member of the lead screw piston assembly from the radial side; a pressure sensor for detecting the braking force is installed at the end of the rotating member of the lead screw piston assembly, and the pressure sensor and the rotating member of the lead screw piston assembly are coaxially arranged; one end of the caliper body is provided with a circuit board, the circuit board is electrically connected to the motor and the pressure sensor respectively, and the pressure sensor feeds back the detected braking force to the circuit board for controlling the operation of the motor; the circuit board in this solution is connected to the internal coil of the motor, and the anti-interference ability is limited. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides an electromechanical brake to achieve the purpose of improving the electromagnetic compatibility function and enhancing the performance of the brake circuit board.

[0006] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0007] The electromechanical brake includes an actuator and a caliper assembly. The actuator includes a circuit board and a motor assembly. The circuit board is electrically connected to the housing of the motor assembly or the caliper assembly to form a ground protection structure.

[0008] Further:

[0009] The actuator further includes an ECU housing and a conductive structure. The circuit board is arranged in the ECU housing, and the conductive structure is arranged on the ECU housing for electrically connecting the circuit board and the housing of the motor assembly.

[0010] The actuator further includes an ECU housing and a conductive medium. The circuit board is connected to the conductive medium and both are arranged inside the ECU housing. The caliper assembly is provided with a conductive post, and the conductive post passes through the ECU housing and is connected to the conductive medium.

[0011] The conductive structure includes a conductive element. The conductive element is arranged on the ECU housing and is electrically connected to the circuit board. The motor end cover is provided with a protruding shaft, and the end of the conductive element is in mating electrical connection with the shaft.

[0012] The conductive structure further includes an elastic conductive medium. The conductive medium is mounted on the shaft and is in contact electrical connection with the conductive element.

[0013] The ECU housing and the conductive element are of an integrally formed or assembled formed structure. The shaft on the motor end cover and the body of the motor end cover are of an integrally formed or interference press-fitted or laser welded structure; one end of the conductive element is connected to the circuit board, and the other end of the conductive element is connected to the shaft on the motor end cover through the conductive medium.

[0014] The conductive element, the conductive medium and the shaft of the motor end cover are coaxially arranged.

[0015] The conductive medium is a helical spring or a spiral spring; the length of the conductive medium in the natural state is longer than the height from the upper end face of the motor end cover to the contact height of the conductive element and the conductive medium. When the ECU housing and the motor assembly are assembled, the conductive medium is in a compressed state.

[0016] The outer periphery of the conductive element is of a hexagonal or rectangular or spline structure, and an anti-rotation structure is formed after the conductive element is assembled with the ECU housing.

[0017] The material of the conductive element is aluminum alloy, and the conductive element is formed by die casting or machining.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The structure of the electro-mechanical brake is reasonably designed. By connecting the circuit board with the motor assembly or the caliper assembly, a smaller reference circuit can be formed to realize a grounding protection structure of the caliper actuator, improve the electromagnetic compatibility function of the electro-mechanical braking system, and is also beneficial to the acquisition of the signals at the board end of the circuit board, improving the performance of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following briefly describes the content expressed by each drawing in this specification and the marks in the drawings:

[0021] Figure 1 It is a schematic diagram of the overall actuator of the present invention.

[0022] Figure 2Explosion schematic diagram of the actuator of the present invention.

[0023] Figure 3 Schematic diagram of the grounding structure of the present invention.

[0024] Figure 4 Schematic diagram of the conductive medium of the present invention.

[0025] Figure 5 Schematic diagram of the front end cover of the motor of the present invention.

[0026] Figure 6 Schematic diagram of the brake assembly of the present invention.

[0027] In the figure:

[0028] 1. Actuator; 1-2. Motor assembly; 1-2-1. Motor end cover; 1-2-1-1. Shaft; 1-3. ECU housing; 1-3-1. Conductive element; 1-4. Conductive medium; 1-5. ECU housing cover; 1-6. Motor gear; 1-7. Double gear; 1-8. Fixing screw Ⅰ; 1-9. Controller function circuit board; 1-10. Fixing screw Ⅱ;

[0029] 2. Caliper assembly, 2.1. Conductive post. Detailed implementation manners

[0030] The following further describes in detail the specific implementation manners of the present invention by describing the embodiments with reference to the accompanying drawings.

[0031] As Figures 1 to 6 shown, the electromechanical brake includes an actuator 1 and a caliper assembly 2. The actuator includes a controller function circuit board 1-9 and a motor assembly 1-2. The circuit board is electrically connected to the housing of the motor assembly or the caliper assembly to form a smaller reference circuit, thereby forming a grounding protection structure for the caliper actuator, improving the electromagnetic compatibility function of the electromechanical braking system, and also facilitating the acquisition of signals at the board end of the circuit board, improving the performance of the circuit board.

[0032] As Figures 1 to 5 shown, the actuator further includes an ECU housing 1-3, a motor end cover 1-2-1 and a conductive structure. The circuit board is fixed in the ECU housing 1-5 by a fixing screw Ⅱ 1-10, and the conductive structure is arranged on the ECU housing 1-5 for electrically connecting the circuit board and the motor end cover.

[0033] Preferably, the conductive structure includes a conductive element 1-3-1. The conductive element 1-3-1 is fixed on the ECU housing and electrically connected to the circuit board. A protruding shaft 1-2-1-1 is provided on the motor end cover, and the end of the conductive element is in electrical connection with the shaft. Further, the conductive structure further includes an elastic conductive medium 1-4. The conductive medium 1-4 is installed on the shaft and is in electrical contact with the conductive element, and the structure is stable and reliable.

[0034] The ECU housing 1-5 and the conductive element are of an integrally formed or assembled and formed structure, and the shaft on the motor end cover and the body of the motor end cover are of an integrally formed, press-fitted with interference or laser welded structure; one end of the conductive element is connected to the circuit board, and the other end of the conductive element is connected to the shaft on the motor end cover through a conductive medium; the integrated setting makes the structure simple.

[0035] The conductive element, the conductive medium and the shaft of the motor end cover are coaxially arranged, which is convenient for fitting and assembling; the ECU housing is provided with mounting holes, the outer periphery of the conductive element is in a hexagonal, rectangular or spline structure, and an anti-rotation structure is formed after the conductive element is assembled with the ECU housing.

[0036] The material of the conductive element 1-3-1 is aluminum alloy, and the conductive element is formed by die casting or machining. The controller functional circuit board, the conductive element, the conductive medium and the motor are arranged in sequence.

[0037] The conductive medium 1-4 is a helical spring or a spiral spring; the length of the conductive medium in the natural state is longer than the height from the upper end face of the motor end cover to the contact height of the conductive element and the conductive medium. When the ECU housing and the motor assembly are assembled, the conductive medium is in a compressed state, avoiding poor contact caused by vibration.

[0038] As Figure 6 shown, it is another grounding implementation scheme, which can be implemented together with Figures 1 to 5 the scheme or implemented alone. The actuator further includes an ECU housing and a conductive medium. The circuit board and the conductive medium are connected and both are arranged in the ECU housing. The clamp body assembly 2 is provided with a conductive post 2.1, and the conductive post passes through the ECU housing and is connected to the conductive medium.

[0039] That is, the grounding scheme of the present invention specifically refers to effectively connecting the circuit board with the motor assembly housing or the clamp body assembly through a conductive structure, so as to form a smaller reference loop between the circuit board and the motor assembly or the clamp body assembly, and improve the electromagnetic compatibility function (EMC) of the electro-mechanical braking (EMB) system.

[0040] Preferred Embodiment 1 of the Present Invention:

[0041] As Figure 1 shown, the present invention mainly proposes an actuator with a grounding structure, and the main structure at least includes an ECU housing, an ECU housing cover, a motor assembly, a controller functional circuit board and a grounding spring. The motor assembly at least includes a stator, a rotor and a motor end cover. The motor end cover is provided with a tapered shaft, and the grounding spring is installed on the shaft of the motor end cover and is arranged between the ECU housing and the motor end cover.

[0042] As Figure 1 and Figure 2As shown in the figure, the motor assembly 1-2 is a brushless motor. A motor gear 1-6 and a signal magnet for the motor end cover are press-fitted on the rotating shaft of the motor assembly 1-2. The signal magnet is located above the motor gear. A double gear 1-7 is installed on another rotating shaft of the motor assembly 1-2. The double gear 1-7 meshes with the motor gear 1-6. The ECU housing 1-3 is assembled on the motor assembly 1-2 and fastened by fixing screws I 1-8. The ECU housing 1-3 is provided with limit posts, and holes corresponding to the limit posts on the ECU housing are provided on the controller function circuit board. The holes on the controller function circuit board are matched with the limit posts of the ECU housing and fastened by self-tapping screws. The ECU housing and the ECU housing cover are adhesively sealed with glue.

[0043] As Figure 3 and Figure 4 shown in the figure, a conductive element metal insert is provided on the ECU housing 1-3. The metal insert 1 is integrally injection-molded with the plastic body of the ECU housing 1-3. One end of the metal insert is a polygonal structure for starting and stopping rotation, and the other end is a blind hole with a tapered structure. As Figure 5 、 Figure 6 shown in the figure, the conductive medium grounding spring is a helical spring or a volute spring and is installed on the shaft 1-2-1-1 of the motor end cover 1-2-1. When the ECU housing 1-3 and the motor assembly are fastened by fixing screws, since the natural length of the grounding spring is greater than the distance from the upper plane of the motor end cover 1-2-1 to the step surface of the metal insert, the step surface of the metal insert contacts the end surface of the grounding spring, and the grounding spring is compressed. The controller function circuit board 1-9 is installed on the limit posts of the ECU housing 1-3. The motor assembly 1-2 and the controller function circuit board 1-9 are electrically connected by soldering. The controller function circuit board 1-9 and the housing 1-3 are electrically connected by fixing screws II 1-10. When powered on, the fixing screws II 1-10 are connected to the controller function circuit board 1-9, the ECU housing insert, the grounding spring, and the motor assembly to achieve the grounding function.

[0044] Preferred Embodiment 2 of the present invention:

[0045] As Figure 6As shown in the figure, this embodiment provides an electro-mechanical brake caliper, which includes an actuator 1 and a caliper assembly 2. The actuator 1 includes a motor assembly 1.2, an ECU housing 1.3, an ECU housing cover 1.5, and a controller function circuit board 1.9. The controller function circuit board 1.9 is provided with a conductive medium 1.4, which can be a spring or a compressible conductive substance. The end face of the caliper assembly 2 is provided with a conductive post 2.1, and the conductive post 2.1 is arranged coaxially with the conductive medium 1.4. The ECU housing 1.3 is provided with a hole coaxially with the conductive medium 1.4. The inner diameter of the hole in the ECU housing is larger than the outer diameter of the conductive post 2.1 of the caliper assembly 2, ensuring that the conductive post can be assembled into the hole in the ECU housing 1.3. When the actuator 1 is installed on the caliper assembly 2, the conductive post 2.1 passes through the hole in the ECU housing and contacts the conductive medium 1.4 of the controller function circuit board (). The ECU housing is fixed by fixing bolts 1.8. At this time, the controller function circuit board 1.9 and the caliper assembly 2 achieve the grounding function.

[0046] The above is only a description of the preferred embodiments of the present invention. The above technical features can be combined arbitrarily to form multiple embodiment schemes of the present invention.

[0047] The present invention has been described exemplarily above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An electromechanical brake, comprising an actuator and a caliper assembly, wherein the actuator includes a circuit board and a motor assembly, and is characterized in that: The circuit board is electrically connected to the housing of the motor assembly or the pliers body assembly to form a grounding protection structure.

2. The electromechanical brake according to claim 1, characterized in that: The actuator further includes an ECU housing and a conductive structure. The circuit board is disposed inside the ECU housing, and the conductive structure is disposed on the ECU housing for electrically connecting the circuit board and the housing of the motor assembly.

3. The electromechanical brake according to claim 1, characterized in that: The actuator further includes an ECU housing and a conductive medium. The circuit board and the conductive medium are connected and both are disposed inside the ECU housing. A conductive post is provided on the pliers body assembly, and the conductive post passes through the ECU housing and is connected to the conductive medium.

4. The electromechanical brake according to claim 2, characterized in that: The conductive structure includes a conductive element. The conductive element is disposed on the ECU housing and is electrically connected to the circuit board. A protruding shaft is provided on the motor end cover, and the end of the conductive element is in mating electrical connection with the shaft.

5. The electromechanical brake according to claim 4, characterized in that: The conductive structure further includes an elastic conductive medium. The conductive medium is mounted on the shaft and is in contact electrical connection with the conductive element.

6. The electromechanical brake according to claim 5, wherein: The ECU housing and the conductive element are of an integrally formed or assembled formed structure. The shaft on the motor end cover and the body of the motor end cover are of an integrally formed, interference press-fitted or laser welded structure. One end of the conductive element is connected to the circuit board, and the other end of the conductive element is connected to the shaft on the motor end cover through the conductive medium.

7. The electromechanical brake according to claim 5, characterized in that: The conductive element, the conductive medium and the shaft of the motor end cover are coaxially arranged.

8. The electromechanical brake according to claim 5, characterized in that: The conductive medium is a helical spring or a spiral spring. The length of the conductive medium in its natural state is longer than the height from the upper end face of the motor end cover to the contact height between the conductive element and the conductive medium. When the ECU housing and the motor assembly are assembled, the conductive medium is in a compressed state.

9. The electromechanical brake according to claim 6, wherein: The outer periphery of the conductive element is of a hexagonal, rectangular or spline structure. After the conductive element is assembled with the ECU housing, an anti-rotation structure is formed.

10. The electromechanical brake according to claim 6, wherein: The material of the conductive element is aluminum alloy, and the conductive element is formed by casting or machining.

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