Electromechanical brake

Abstract

To provide an electromechanical brake that occupies a smaller space and is more compact.SOLUTION: An electromechanical brake is provided, including: a brake motor; a spindle coupled with the brake motor and rotating in a first direction under a drive of the brake motor to drive a brake caliper module to perform a brake operation; and a locking device. The locking device includes: a rotating lever including an operating end, the rotating lever being configured to rotate between an idle position and a working position at which the operating end is interlocked with the ratchet; an actuation member; and a reset member. The operating ends of the ratchet and the rotating lever are set such that when in the working position, the operating end interacts with the ratchet to prevent the ratchet from rotating in a second direction opposite to the first direction and to prevent the rotating lever from rotating toward the idle position.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to the field of vehicle braking systems, and more particularly to electromechanical brakes with integrated locking devices. [Background technology]

[0002] Electromechanical brakes are devices that achieve braking by driving brake calipers with a motor. Compared to conventional hydraulic piping braking, they have the advantages of faster response, simpler structure, and easier maintenance. As vehicles become more electrified and smarter, electromechanical brakes are becoming a development trend for brake systems because they are easy to integrate with electric control systems. Since electromechanical brakes are installed inside the wheel hub of a vehicle, achieving both compactness and functionality is a challenge in designing electromechanical brakes.

[0003] In a conventional hydraulic brake system, the handbrake or footbrake maintains the hydraulic pressure in the brake cylinder to realize the parking brake. For an electromechanical brake, a parking lock device is usually arranged to realize the parking brake function, for example, a pin driven by an electromagnetic actuator is used to interfere with the transmission mechanism to lock the brake. However, such a system requires that the electromagnetic actuator is kept energized when the vehicle is parked, and if the electromagnetic actuator breaks down, the parking brake may fail. Summary of the Invention [Problem to be solved by the invention]

[0004] It is an object of the present application to solve or at least alleviate the problems existing in the prior art. [Means for solving the problem]

[0005] According to one aspect of the present invention, A brake motor; a main shaft connected to the brake motor, the main shaft defining an axial direction and rotating along a first direction under the driving of the brake motor to drive a brake caliper module to perform a braking operation; and a ratchet fixedly mounted on the main shaft; and a locking device, a rotating lever including an operating end, the rotating lever being rotatable between an idle position in which the operating end is separated from the ratchet and an operating position in which the operating end is interlocked with the ratchet; a biasing member that rotates the rotating lever from the idle position to the operating position, and a return member that returns the rotating lever from the operating position to the idle position, The ratchet and an operating end of the rotating lever are provided with an electromechanical brake arranged such that when in the actuated position, the operating end and the ratchet interact to prevent rotation of the ratchet along a second direction opposite to the first direction and to prevent rotation of the rotating lever to the idle position.

[0006] Alternatively, in an embodiment of the electromechanical brake, the ratchet rotates with the main shaft in a first plane perpendicular to the axial direction, and the rotating lever is arranged to rotate in the first plane between the idle position and the actuated position; or The rotating lever is adapted to rotate in a second plane parallel to the first plane, an operating end of the rotating lever extends from the second plane to the first plane, and the rotating lever at least partially overlaps with the ratchet in the axial direction.

[0007] Optionally, in an embodiment of the electro-mechanical brake, the shaft includes opposed forward and rearward ends, the forward end of the shaft being coupled to a brake caliper module and the ratchet being fixedly attached to the rearward end of the shaft.

[0008] Optionally, in the electromechanical brake embodiment, a worm gear is fixedly mounted to an intermediate portion of the main shaft between the front and rear ends.

[0009] Optionally, in an embodiment of the electromechanical brake, the output shaft of the brake motor is configured as a worm screw that intersects the axial direction and meshes with a worm gear on the main shaft.

[0010] Optionally, in an embodiment of the electro-mechanical brake, the electro-mechanical brake includes a brake motor, a main module, a brake caliper module, and an electronic control unit, the main module includes a main housing and an end cover, the main housing has a first end connected to the brake caliper module and a second end opposite to the first end closed by the end cover.

[0011] Optionally, in an embodiment of the electromechanical brake, the main shaft, the ratchet, the worm gear and the locking device are housed between the main housing and the end cover.

[0012] Optionally, in the electromechanical brake embodiment, the rotating lever and the return member are pre-attached to the end cover and assembled to the main housing together with the end cover.

[0013] Optionally, in an embodiment of the electromechanical brake, the brake motor and the electronic control unit are connected to the main housing from opposite sides of the main housing, an output shaft of the brake motor extends through the main housing to the electronic control unit, and a position sensor is provided at an end of the output shaft of the brake motor, and the electronic control unit is electrically connected to the brake motor and the biasing member of the locking device.

[0014] Optionally, in an embodiment of the electromechanical brake, the biasing member is an electromagnet pre-mounted in the main housing or the end cover, the main housing or the end cover having a port facing the electronic control unit for electrically connecting the electromagnet with the electronic control unit, and the return member is a torsion spring mounted on the pivot shaft of the rotating lever, or a folding spring mounted between a number of locating pins of the end cover.

[0015] Optionally, in an embodiment of the electromechanical brake, the rotating lever has an axially extending application end and the electromagnet acts on the application end.

[0016] Optionally, in the embodiment of the electromechanical brake, the second moment arm L2 from the actuation end to the center of rotation is at least three times, such as at least five times, the first moment arm L1 from the working end to the center of rotation.

[0017] Optionally, in an embodiment of the electromechanical brake, the rotating lever further comprises a counterweight portion for moving the center of mass of the rotating lever closer to a center of rotation of the rotating lever.

[0018] Optionally, in the electromechanical brake embodiment, the locking device further comprises a stopper for limiting the position of the rotary lever when it returns from the actuated position to an idle position.

[0019] Optionally, in the electromechanical brake embodiment, the stopper is a stopper pin fixedly connected to the end cover.

[0020] Optionally, in the electromechanical brake embodiment, the stop pin is encased in a dampening material.

[0021] Optionally, in an embodiment of the electromechanical brake, the end cover has an additional cavity for accommodating an electromagnet, the electromagnet being disposed within the additional cavity.

[0022] Optionally, in an embodiment of the electromechanical brake, a pivot shaft of the rotating lever is disposed between the end cover and the main housing at a corresponding opening, the rotating lever is rotatably fixed to the pivot shaft, and the return member is a torsion spring disposed on the pivot shaft, the torsion spring having a first end abutting the rotating lever and a second end fixed, and the rotating lever being flush with the ratchet.

[0023] Optionally, in an embodiment of the electromechanical brake, the second end of the main housing has a cylindrical recess, a side wall of the cylindrical recess has an electromagnet cavity having a port communicating with the electronic control unit, the electromagnet is mounted in the electromagnet cavity such that an active end of the electromagnet faces the inside of the cylindrical recess and a connection port on a back side of the electromagnet faces the electronic control unit, and the end cover is disk-shaped so as to be mountable in the cylindrical recess.

[0024] Optionally, in an embodiment of the electromechanical brake, a pivot shaft is provided on the end cover, and the rotating lever is rotatably fixed to the pivot shaft.

[0025] Optionally, in an embodiment of the electromechanical brake, the rotating lever includes a rotating lever body including a pivot shaft mounting hole and a first arm, a second arm and a third arm extending in three directions from the pivot shaft mounting hole, and ends of the first arm, the second arm and the third arm respectively have an operating end, an action end and a counterweight portion extending in an axial direction, the rotating lever body is in a second plane parallel to the first plane, and the operating end, the action end and the counterweight portion extend in an axial direction from the second plane to the first plane, and the action end and the counterweight portion are located radially outside the ratchet while the rotating lever is rotating between the idle position and the actuated position.

[0026] Optionally, in an embodiment of the electromechanical brake, the end cover further comprises a first locating pin, a second locating pin, and a folding spring attached to the first locating pin and the second locating pin.

[0027] Optionally, in an embodiment of the electromechanical brake, the electromechanical brake further comprises an adapter connecting the electronic control unit, the electromagnet and the brake motor, the adapter having an electromagnet holder for supporting the electromagnet.

[0028] Optionally, in an embodiment of the electro-mechanical brake, the pivot shaft of the rotating lever includes a first post, a second post and a transition section, the first post and the second post being offset and connected via the transition section, and the pivot shaft is connected between offset mounting holes of the end cover and the main housing.

[0029] Electromechanical brakes according to embodiments of the present invention take up less space and are more compact. [Brief description of the drawings]

[0030] The disclosure of the present application will be more easily understood with reference to the drawings. Those skilled in the art can easily understand that these drawings are merely for illustrative purposes, and are not intended to limit the scope of protection of the present application. In addition, in the drawings, like numerals are used to indicate like elements. [Figure 1] 1 shows an exploded view of an electromechanical brake according to an embodiment when assembled to a wheel hub. [Diagram 2] 1 shows a perspective view of an electromechanical brake according to a first embodiment of the present invention; [Diagram 3] 1 shows an exploded view of an electromechanical brake according to a first embodiment of the present invention; [Figure 4] 1 shows a principle diagram of an electromechanical brake according to a first embodiment of the present invention; [Diagram 5]1 shows an exploded view of an end cover and a locking device according to a first embodiment of the present invention. [Figure 6] 1 shows a perspective view of a rotating lever according to a first embodiment of the present invention; [Figure 7] 1 shows an assembly diagram of an end cover and a locking device according to a first embodiment of the present invention. [Figure 8] 1 shows an exploded view of a locking device according to a first embodiment of the present invention. [Figure 9] 1 shows a perspective view of an electromechanical brake according to a first embodiment of the present invention with an end cover removed; FIG. [Figure 10] 1 is a front view of a locking device according to a first embodiment of the present invention in an idle state. [Figure 11] 1 is a perspective view of a locking device according to a first embodiment of the present invention in an idle state. [Figure 12] 1 is a front view of a locking device according to a first embodiment of the present invention when the locking device is converted from an idle state to an actuated state. [Figure 13] 1 is a front view of a locking device according to a first embodiment of the present invention in an actuated state. [Figure 14] 3 shows some design sizes of a locking device according to a first embodiment of the present invention. [Figure 15] FIG. 2 is a schematic diagram showing an end cover of the electromechanical brake according to the first embodiment of the present invention when being assembled; [Figure 16] 1 is a schematic diagram of an electronic control unit of an electromechanical brake according to a first embodiment of the present invention when assembled; FIG. [Figure 17] FIG. 2 shows a perspective view of an electromechanical brake according to a second embodiment of the present invention. [Figure 18] FIG. 4 shows a partial exploded view of an electromechanical brake according to a second embodiment of the present invention. [Figure 19] FIG. 13 is a perspective view of an end cover and locking device of an electromechanical brake according to a second embodiment of the present invention. [Figure 20] FIG. 6 shows an exploded view of an end cover and locking device of an electromechanical brake according to a second embodiment of the present invention. [Figure 21]FIG. 4 shows a perspective view of a rotating lever according to a second embodiment of the present invention. [Figure 22] FIG. 11 is a front view of a locking device according to a second embodiment of the present invention in an idle state. [Diagram 23] FIG. 13 is a rear view of a locking device according to a second embodiment of the present invention in an idle state. [Figure 24] FIG. 13 is a perspective view of a locking device according to a second embodiment of the present invention in an idle state. [Diagram 25] FIG. 11 is a front view of a locking device according to a second embodiment of the present invention in an idle state. [Figure 26] FIG. 13 is a schematic diagram showing an end cover of the electromechanical brake according to the second embodiment of the present invention when being assembled. [Figure 27] FIG. 13 is a schematic diagram of an electromechanical brake according to a second embodiment of the present invention when assembled; [Figure 28] FIG. 13 shows a perspective view of an electromechanical brake according to a third embodiment of the present invention. [Figure 29] FIG. 13 shows a partial exploded view of an electromechanical brake according to a third embodiment of the present invention. [Diagram 30] FIG. 13 is a perspective view of an end cover and locking device of an electromechanical brake according to a third embodiment of the present invention. [Diagram 31] FIG. 13 is a perspective view of a locking device according to a third embodiment of the present invention. [Diagram 32] 13 shows an exploded view of an end cover and locking device of an electromechanical brake according to a third embodiment of the present invention. FIG. [Diagram 33] FIG. 13 shows a perspective view of a pivot pin according to a third embodiment of the present invention. [Diagram 34] FIG. 13 is a perspective view of a main housing according to a third embodiment of the present invention. [Diagram 35] FIG. 35 is an enlarged view of a pivot pin receiving hole in a perspective view (FIG. 34) of a main housing according to a third embodiment of the present invention. [Diagram 36] FIG. 13 shows a perspective view of an adapter for an electromechanical brake according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] 1 shows an installation diagram of an electromechanical brake, and shows an electromechanical brake 100 according to an embodiment, which includes a rotating shaft 91, a suspension 92, a bearing 94, a knuckle arm 93, a brake disc 95, a wheel 96, and a brake caliper that provides braking force by clamping the brake disc 95 when driven by a motor. During assembly, the electromechanical brake 100 is attached to the knuckle arm 93 and housed in a compact space inside the wheel hub of the wheel 96, so that the volume of the electromechanical brake 100 itself is severely limited.

[0032] 2 to 16, an electromechanical brake 100 according to a first embodiment of the present invention will be described. The electromechanical brake 100 is designed modularly and generally includes a brake motor 1, a main module 3, a brake caliper module 5 and an electronic control unit 4. The main module 3 accommodates a main shaft 301 connected to the brake motor 1, and in this specification, the direction along which the main shaft 301 runs is referred to as the axial direction. The main shaft 301 rotates in a first direction under the driving of the brake motor 1, thereby driving the brake caliper module 5 to perform a braking operation, i.e., friction with the brake disc 95, and a ratchet 33 is fixedly provided on the main shaft 301.

[0033] As shown in Fig. 4, the main shaft 301 includes a front end 302 and a rear end 303. The front end 302 of the main shaft 301, i.e., one end close to the brake caliper module 5, constitutes a lead screw of a ball screw nut mechanism 304, and the rear end 303 of the main shaft 301, i.e., one end away from the brake caliper module 5, is provided with a ratchet 33. A worm gear 32 for receiving torque from the brake motor 1 may be provided at an intermediate portion (a position between the front end and the rear end) of the main shaft 301, and at least a part of the output shaft 11 of the brake motor 1 may be configured as a worm screw, the output shaft being oriented to intersect with the axial direction and meshing with the worm gear 32 to transmit torque (see Fig. 9). The main shaft 301 rotates in a first direction under the driving of the brake motor 1, and drives the movement of the plunger 305 by the ball screw nut mechanism 304, so that the brake caliper module 5 clamps the brake disc 95 and performs the braking function.

[0034] Meanwhile, a locking device 8 for performing a parking brake function in cooperation with the ratchet 33 is further provided. The locking device includes a rotating lever 81 including an operating end 811 and capable of rotating between an idle position (shown in Figs. 10 and 11) where the operating end 811 is separated from the ratchet and an operating position (shown in Fig. 13) where the operating end 811 is interlocked with the ratchet, a biasing member for rotating the rotating lever from the idle position to the operating position, and a return member for returning the rotating lever from the operating position to the idle position. Here, the ratchet 33 and the operating end 811 of the rotating lever are provided to interfere with each other when in the operating position, so as to prevent the ratchet 33 from rotating along a second direction opposite to the first direction and to prevent the rotating lever 81 from returning to the idle position.

[0035] In some embodiments, the main module 3 of the electromechanical brake includes a main housing 31 and an end cover 39, and a first end of the main housing 31 is connected to the brake caliper module 5, and a second end opposite to the first end is closed by the end cover 39. The main shaft 301, the ratchet 33, the worm gear 32, the locking device 8, etc. are accommodated in the space between the main housing 31 and the end cover 39. In the first embodiment, the locking device 8 is provided in the end cover 39. Specifically, referring to FIG. 5, in some embodiments, the end cover 39 includes a main body portion (lower portion) for covering the ratchet position in the main housing, and an additional portion (upper portion) for covering the worm screw position in the main housing, and the additional portion of the end cover has an additional cavity 391 for accommodating the biasing member of the locking device 8, and in this embodiment, the biasing member is an electromagnet 82 provided in the additional cavity 391 of the end cover. In this embodiment, the pivot shaft 83 of the rotating lever 81 is connected between the opening 392 of the end cover and an opening (not shown) at a corresponding position of the main housing, and the rotating lever 81 is rotatably fixed to the pivot shaft 83, for example, the pivot shaft 83 passes through a pivot shaft mounting hole 810 of the rotating lever 81. In a specific embodiment shown in FIG. 8, the rotating lever 81 is axially positioned on the pivot shaft 83 via notches 831, 832 on the pivot shaft 83 and corresponding retaining rings 833, 834, and the opposing ends 835, 836 of the pivot shaft 83 are press-fitted into the openings of the end cover 39 and the main housing 31, respectively. In this embodiment, the return member is a torsion spring 84 provided on the pivot shaft 83 and connected to the rotating lever 81. 7, the torsion spring 84 has a first end 841 that abuts against the hook portion 817 of the rotating lever 81 and a second end 842 that is fixed and abuts against, for example, a first protrusion 394 on the end cover, and the torsion spring 84 is pre-compressed or pre-tensioned to provide a return elasticity. The end cover is further provided with a second protrusion 393 that serves to limit the position of the rotating lever 81 when the rotating lever is returned by an elastic member, and in some embodiments, the second protrusion 393 may be wrapped with a cushioning material to provide a cushioning function and reduce impact noise.

[0036] In some embodiments, the working end 819 of the rotating lever 81 extends in the axial direction and is used to contact and receive power from a biasing mechanism such as the working end 821 of the electromagnet 82 (as shown in FIG. 8). In the first embodiment, the rotating lever 81 is in the same plane as the ratchet 33 and is located approximately on one side of the ratchet close to the worm screw of the brake motor, and the rotating lever 81 receives a rotational force by the working end 819 extending in the axial direction. Referring to FIG. 10 to FIG. 13, the ratchet 33 rotates in a first plane together with the main shaft 301, and the rotating lever 81 is arranged to rotate in the first plane, and in the idle position, the rotating lever 81 is located on the radial outside (worm screw side) of the ratchet 33, and the ratchet teeth 331 of the ratchet 33 are located on the outer periphery of the ratchet 33. In some embodiments, the operating end 811 is configured as a hook portion, and in the actuated position, the hook portion is hooked into one of the ratchet teeth 331 on the outer periphery of the ratchet, thereby realizing the interlock. More specifically, taking Fig. 13 as an example, the counterclockwise direction in the figure corresponds to the first direction in which the ratchet 33 rotates by the driving of the brake motor 1, and when the brake motor 1 stops operating, the ratchet 33 tends to rotate along a second direction (clockwise direction in Fig. 13) opposite to the first direction, and the ratchet tooth 331 is engaged with the hook portion of the operating end 811, thereby realizing the interlock, and in this case, even if the power supply of the electromagnet 82 is cut off, that is, even if its actuating end 821 is retracted, the ratchet tooth 331 and the operating end 811 will not be separated. Conversely, when the ratchet 33 rotates again in the first direction (counterclockwise in FIG. 13) under the action of the brake motor 1, the ratchet teeth 331, under the action of the restoring elastic force of the torsion spring 84, guide the rotating lever 81 to rotate to the idle position, thereby simultaneously releasing both the rotating lever 81 and the ratchet 33.

[0037] Referring to FIG. 3, the electromechanical brake according to the present invention is designed modularly, and includes a main module 3 and a brake caliper module 5 mounted at the distal end of the main module 3, with a fastening nut 61 and a sealing ring 62 provided therebetween. The main module 3 includes a main housing 31 and an end cover 39, in which the main housing 31 accommodates a main shaft 301, a ball screw nut mechanism 304, a ratchet 33, a worm gear 32, a locking device 8, etc. The main housing 31 has a first end 311 connected to the brake caliper module 5, and a second end 312 opposite to the first end is closed by the end cover 39. The brake motor 1 and the electronic control unit 4 are integrated on opposite sides of the main module 3, such as a first side 313 and a second side 314. It should be understood that the operation of the brake motor 1 and the electromagnet 82 of the locking device 8 is controlled by the electronic control unit 4. Specifically, as shown in FIG. 4, the brake motor 1 and the electromagnet 82 are connected to the electronic control unit 4. In the parking brake control, upon receiving a parking brake signal, the electronic control unit 4 controls the rotation of the brake motor 1 so that the main shaft 301 rotates in a first direction, so that the brake caliper module 5 establishes a predetermined brake torque even if the brake caliper clamps the brake disc 95. The electronic control unit 4 then controls the electromagnet 82 to act on the rotating lever 81 to rotate the rotating lever 81 from an idle position to an actuated position, and at this time, the hook portion of the operating end of the rotating lever 81 is not necessarily aligned with the ratchet teeth 331 of the ratchet 33 (for example, as shown in FIG. 12 ). In this case, by controlling the brake motor 1 to rotate slightly along the second direction (for example, one tooth position), the operating end 811 of the rotating lever moves to the actuated position shown in FIG. 13 to interlock with the ratchet teeth 331 of the ratchet 33, and at this time, the power supply of the electromagnet 82 and the brake motor 1 may be cut off.Since the rotating lever 81 and the ratchet 33 are interlocked, even if the power supply of the electromagnet 82 and the brake motor 1 is cut off, the brake caliper module 5 can still maintain the brake torque, so that the electromagnet 82 does not need to be kept operating when the vehicle is in the parking brake state, reducing the risk of damage caused by the long-term operation of the electromagnet 82. When the vehicle needs to be restarted, simply by controlling the brake motor 1 to rotate, the ratchet 33 will rotate in the first direction, and the rotating lever 81 will return to the idle position under the action of the guide by the ratchet teeth of the ratchet 33 and the return member until the next parking brake is performed.

[0038] 14, in some embodiments, the ratchet teeth 331 of the ratchet 33 and the rotating lever 81 have a maximum joint depth c of more than 3 mm, for example, 4.5 mm, in order to ensure stability when the two are interlocked. Also, the second moment arm L2 from the operating end of the rotating lever 81 to the rotation center is three times or more than the first moment arm L1 from the working end to the rotation center. For example, in the illustrated embodiment, the second moment arm L2 is 39.3 mm, the first moment arm L1 is 7 mm, and the second moment arm L2 is five times or more than the first moment arm L1. This setting can reduce the displacement d of the electromagnet 82. Meanwhile, the rotating lever 81 may have a counterweight portion 818 for moving the center of mass of the rotating lever closer to the rotation center, and thus the requirements for the capacity of the electromagnet 82 can be reduced, that is, the electromagnet 82 may have a smaller thrust and accordingly a smaller volume.

[0039] 15 and 16, the end cover 39 with the locking device 8 previously attached thereto is assembled to the main housing 31, and a first sealing member 318 is provided between the main housing 31 and the end cover 39 to seal them. Then, the electronic control unit 4 is assembled to the main module 3, and the end cover 39 has a port for connecting the electromagnet 82 and the electronic control unit 4, and a second sealing member 82 is provided around the port. The main housing 31 also has a port toward the electronic control unit, in which the output shaft 11 of the brake motor is exposed, and a position sensor may be provided thereon, so that the electronic control unit 4 monitors the angle and position of the output shaft. An additional opening 310 may be used, for example, to arrange and connect the circuits of the brake motor 1 and the electronic control unit 4. A third sealing member 319 surrounds the output shaft 11 of the brake motor 1 and the opening 310 to provide an additional seal. From the above structure, it can be seen that the electromechanical brake according to the first embodiment of the present invention has a compact structure, a reasonable layout, is easy to assemble, and its modular design makes it easy for subsequent maintenance.

[0040] 17 to 27, a second embodiment of the present invention will be described. In the second embodiment, the electronic control unit 4 is replaced by a back plate 40 of the electronic control unit, and other similar members are given the same reference numerals. In this embodiment, the second end of the main housing 31 of the main module 3 has a cylindrical recess, and the end cover 39 is also formed in a substantially disk shape. In this embodiment, the locking device 8 is also substantially integrated with the end cover 39, and the electromagnet 82, which is the biasing member, is provided in the main housing 31. Specifically, an electromagnet cavity 318 is opened in the side wall of the cylindrical recess, the electromagnet 82 is accommodated in the electromagnet cavity 318, and the end cover 39 also has a wall 399 (FIG. 20) that matches the cylindrical shape of the electromagnet 82, so that the electromagnet 82 is located between the main housing 31 and the end cover 39 and is in contact with both when the electromagnet 82 is attached at a predetermined position. 19, when the electromagnet 82 is attached in a predetermined position, its working end 821 faces the rotating lever 81 and the connection port on the back side faces the electronic control unit 4.

[0041] 20, it can be seen that the inside of end cover 39 has shaft hole 390 for locating pivot shaft 83 of the rotating lever, openings 397, 398 for locating first positioning pin 68 and second positioning pin 69, and a plurality of reinforcing ribs extending radially from shaft hole 390. One end of pivot shaft 83 is fitted into shaft hole 390 and passes through mounting hole 810 for the pivot shaft of rotating lever 81, and is positioned in the axial direction by a retaining ring 833. The folding spring 84 is attached to the first positioning pin 68 and the second positioning pin 69, specifically, the folding spring 84 has a first end 843 fixed to the first positioning pin 68, a bent portion 844 bypassing the second positioning pin 69, and a second end 845 abutting the rotating lever, the second end 845 being formed, for example, as a vice or collar to better support the arm of the rotating lever connected to the operating end 811.

[0042] 21, the specific structure of the rotating lever 81 is shown. The rotating lever 81 includes a first arm 812, a second arm 813, and a third arm 814 extending in three directions from a mounting hole 810 of the pivot shaft, and an operating end 811, an action end 819, and a counterweight portion 818 extend axially from the ends of the first arm 812, the second arm 813, and the third arm 814, respectively. The operating end 811 is used to interact with the ratchet 33 in a manner described in detail in conjunction with the first embodiment, the action end 819 receives the thrust of the electromagnet 82, and the counterweight portion 818 is provided so as to bring the center of mass of the rotating lever closer to the pivot center. From FIG. 21 to FIG. 25, it can be seen that if the rotation surface of the ratchet 33 is a first plane, the rotating lever 81 rotates in a second plane parallel to the first plane, and the second plane is farther away from the brake caliper module 5. In some embodiments, the rotating lever 81 at least partially overlaps with the ratchet 33 in the axial direction, and the operating end 811, the working end 819 and the counterweight portion 818 extend from the second plane to the first plane in the axial direction, respectively, and are located radially outside the ratchet. More specifically, the working end 819 and the counterweight portion 818 are always located radially outside the ratchet 33 while the rotating lever is rotating between the idle position and the working position, and the interaction manner between the operating end 811 and the teeth of the ratchet is substantially the same as that described in the first embodiment, and a detailed description is omitted here. With such an arrangement, the locking device 8 can make the main module 1 more compact by slightly increasing the size of the main module 1 only in the axial direction without increasing the size of the main module 1 in other directions.

[0043] 26 and 27, the end cover 39 has a disk-like shape and can be assembled into a cylindrical recess of the main housing 31, with a sealing member 69 provided therebetween. Similarly, the connection port of the electromagnet 82 and the end of the motor output shaft extend to the electronic control unit 4.

[0044] 28 to 36, a third embodiment of the present invention will be described. In this embodiment, the adapter 41 is provided between the electronic control unit 4 and the electromagnet 82 and the brake motor 1, and in some embodiments, the adapter 41 may include a clamping portion 43 for receiving the electromagnet 82, as shown in FIG. 36. The adapter 41 further includes a plurality of positioning mounting holes 441.

[0045] 30 and 31, a locking device combined with the end cover 39 and a separate locking device are shown. In some embodiments, the end cover 39 is designed with at least one positioning post 395 inserted into the mounting hole of the main housing to receive the reaction force applied to the end cover when the ratchet and the rotating lever are interlocked. In the third embodiment, the return member uses a folding spring as in the second embodiment, and the pivot shaft 83 is configured to have a first pillar portion 837, a second pillar portion 838 and a transition portion 839 because an opening cannot be provided at a corresponding position in the main housing, and the first pillar portion 837 and the second pillar portion 838 are arranged offset from each other and connected via the transition portion 839. The first pillar portion 837 passes through the positioning pad 63 and is inserted into an opening on the end cover, and the second pillar portion 838 passes through the positioning hole 315 of the main housing 31, which is configured to receive both the second pillar portion 838 and the transition portion 839, thereby restricting rotation of the pivot shaft 83. The pivot shaft 83 passes through the rotating lever 81, and the operating end 811 of the rotating lever 81 and the ratchet 33 interact in the manner described above in conjunction with the first embodiment.

[0046] The specific examples of the present application described above are merely for the purpose of more clearly illustrating the principles of the present application, and each component is clearly shown and described to facilitate the understanding of the principles of the present invention. Those skilled in the art can easily make various modifications or changes to the present application without departing from the scope of the present application. Therefore, it should be understood that all of these modifications or changes should be included in the patent protection scope of the present application.

Claims

1. A brake motor (1); a main shaft (301) connected to the brake motor (1), the main shaft (301) defining an axial direction and rotating along a first direction under the driving of the brake motor, thereby driving a brake caliper module (5) to perform a braking operation; A ratchet (33) fixedly provided on the main shaft (301); A locking device (8); Including, The locking device (8) a rotating lever (81) including an operating end (811) and rotatable between an idle position in which the operating end (811) is separated from the ratchet (33) and an operating position in which the operating end (811) is interlocked with the ratchet (33); a biasing member for rotating the rotating lever (81) from the idle position to the operating position; a return member for returning the rotating lever (81) from the operating position to the idle position; Including, 1. An electromechanical brake comprising: a rotating lever having a rotation end and a ratchet, the rotation end being arranged such that, when in the actuated position, the ratchet and the operating end interact to prevent rotation of the ratchet along a second direction opposite to the first direction and to prevent rotation of the rotating lever to the idle position.

2. the ratchet (33) rotates with the main shaft (301) in a first plane perpendicular to the axial direction, and the rotating lever (81) is arranged to rotate in the first plane between the idle position and the operating position; or 2. The electromechanical brake of claim 1, wherein the rotating lever (81) is arranged to rotate in a second plane parallel to the first plane, an operating end (811) of the rotating lever (81) extends from the second plane to the first plane, and the rotating lever (81) at least partially overlaps the ratchet (33) in the axial direction.

3. 2. The electromechanical brake of claim 1, wherein the main shaft (301) includes opposing front and rear ends (302 and 303), the front end (302) of the main shaft is coupled to a brake caliper module (5), the ratchet (33) is fixedly attached to the rear end (303) of the main shaft (301), and optionally a worm gear (32) is fixedly provided at an intermediate portion between the front and rear ends (302 and 303) of the main shaft (301), and an output shaft (11) of the brake motor (1) is configured as a worm screw that intersects the axial direction and meshes with a worm gear on the main shaft (301).

4. The brake motor (1), a main module (3), a brake caliper module (5), and an electronic control unit (4), the main module (3) including a main housing (31) and an end cover (39), the main housing (31) having a first end connected to the brake caliper module (5) and a second end opposite to the first end closed by the end cover (39), Optionally, the main shaft (301), the ratchet (33), the worm gear (32) and the locking device (8) are housed between the main housing (31) and the end cover (39); The rotating lever (81) and the returning member are attached to the end cover (39) in advance, and are assembled to the main housing (31) together with the end cover (39); 4. The electromechanical brake according to claim 1, wherein the brake motor (1) and the electronic control unit (4) are connected to the main housing (31) from opposite sides of the main housing (31), an output shaft of the brake motor (1) extends through the main housing (31) to the electronic control unit (4), a position sensor is provided at an end of the output shaft of the brake motor (1), and the electronic control unit (4) is electrically connected to the brake motor (1) and a biasing member (82) of the locking device.

5. 5. The electromechanical brake according to claim 4, characterized in that the biasing member is an electromagnet (82) pre-attached to the main housing (31) or the end cover (39), the main housing (31) or the end cover (39) having a port facing the electronic control unit (4) for electrically connecting the electromagnet (82) and the electronic control unit (4), and the return member is a torsion spring provided on the pivot shaft of the rotating lever (81) or a folding spring provided between a number of positioning pins of the end cover (39).

6. 6. The electromechanical brake according to claim 5, characterized in that the rotating lever (81) has an acting end (819) extending in the axial direction, the electromagnet (82) acts on the acting end (819), a second moment arm L2 from the operating end (811) to a rotation center is three times or more, for example five times or more, a first moment arm L1 from the acting end (819) to the rotation center, and the rotating lever (81) further has a counterweight portion (818) that brings the center of mass of the rotating lever (81) closer to the vicinity of the rotation center of the rotating lever.

7. 6. The electromechanical brake according to claim 5, wherein the locking device further includes a stopper (393) for limiting the position of the rotating lever when the rotating lever returns from the operating position to the idle position, the stopper (393) being a stopper pin fixedly connected to the end cover, and optionally the stopper pin being wrapped with a cushioning material.

8. 5. The electromechanical brake according to claim 4, characterized in that the end cover (39) has an additional cavity (391) for accommodating an electromagnet, the electromagnet (82) is provided in the additional cavity (391), a pivot shaft of the rotating lever (81) is provided between the end cover and the openings at the corresponding positions of the main housing, the rotating lever (81) is rotatably fixed to the pivot shaft, and the return member is a torsion spring provided on the pivot shaft, the torsion spring has a first end abutting the rotating lever and a second end fixed, and the rotating lever (81) is on the same plane as the ratchet (33).

9. The second end of the main housing (31) has a cylindrical recess, and a side wall of the cylindrical recess has an electromagnet cavity (318) having a port communicating with the electronic control unit (4), the electromagnet (82) is provided in the electromagnet cavity (318) such that an active end of the electromagnet (82) faces the inside of the cylindrical recess and a connection port on the back side of the electromagnet (82) faces the electronic control unit (4), the end cover is disk-shaped so as to be mountable in the cylindrical recess, a pivot shaft is provided in the end cover, the rotating lever (81) is rotatably fixed to the pivot shaft, and the rotating lever (81) is a rotating lever including a pivot shaft mounting hole and a first arm, a second arm and a third arm extending in three directions from the pivot shaft mounting hole.

5. The electromechanical brake according to claim 4, further comprising a bar body, the ends of the first arm, the second arm and the third arm each having an operating end, an action end and a counterweight portion extending in an axial direction, the rotating lever body being in a second plane parallel to the first plane, and the operating end, the action end and the counterweight portion extending in an axial direction from the second plane to the first plane, the action end and the counterweight portion being located radially outside the ratchet while the rotating lever is rotating between the idle position and the operating position, and the end cover further comprising a first positioning pin, a second positioning pin and a folding spring attached to the first positioning pin and the second positioning pin.

10. 5. The electromechanical brake according to claim 4, further comprising an adapter (41) for connecting the electronic control unit (4), the electromagnet (82) and the brake motor (1), the adapter (41) including an electromagnet clamping portion (43) for receiving the electromagnet (82), the pivot shaft (83) of the rotating lever including a first column portion (837), a second column portion (838) and a transition portion (839), the first column portion (837) and the second column portion (838) being offset and connected via the transition portion (839), the pivot shaft (83) being connected between offset mounting holes of the end cover and the main housing.

Images