An electromechanical brake

Abstract

The utility model discloses an electronic mechanical brake, including installation support, tongs, brushless motor and transmission, and installation support includes front dog and rear dog, and the outer brake shoe is slidably arranged on the front dog, and the inner brake shoe is slidably arranged on the rear dog, and the brake disc is arranged between the front dog and the rear dog, tongs are slidably connected with installation support through two guide rods, and the piston cylinder is equipped on tongs, and the piston cylinder is equipped with the piston that can axially slide and is connected with the output of transmission, and the hook portion that is outside the outer brake shoe is equipped with the front end of tongs, and the rear end of tongs is equipped with two tongs support ears, and one of guide rods is connected between one tongs support ear and the rear dog of installation support, transmission includes transmission casing, and the brushless motor is installed on transmission casing, and transmission casing is fixedly connected with the rear end of tongs through at least three screws.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle braking technology, specifically relating to an electromechanical brake. Background Technology

[0002] The reliability of the braking system is crucial for driving safety. In recent years, with the development of electronic control technology, electromechanical brakes have been increasingly installed on vehicles. An electromechanical brake (EMB) consists of a mounting bracket, caliper, electronic control unit, motor, transmission, motion conversion mechanism, piston, and brake pads. The torque output by the motor is reduced and increased by the transmission, and then the motion conversion mechanism converts the rotational motion into translational motion, which drives the piston to move. The piston then pushes the brake pads to press against the brake disc, thereby braking the wheels. The motion conversion mechanism and piston are mounted on the caliper, the brake pads are mounted on the mounting bracket, the electronic control unit and motor are generally directly mounted on the housing of the transmission, and the mounting bracket is mounted on the vehicle body.

[0003] In the prior art, the guide rod used for relative sliding between the clamp body and the mounting bracket runs through the entire mounting bracket along the movement direction of the brake pad, which can easily cause interference to the brake disc located at the brake pad position.

[0004] In the prior art, in order to install the motor, the housing of the transmission device extends into a cantilever section, on which the motor is mounted. However, under vibration conditions, the amplitude of the cantilever section on the housing is large, and the motor mounted on the cantilever section is heavy. The center of gravity of the motor deviates from the fixed point of the housing, further aggravating the vibration of the housing. This can easily cause damage to the motor or electronic control unit mounted on the housing, resulting in the failure of the electromechanical brake and seriously threatening driving safety.

[0005] For example, Chinese invention patent application CN117948361A discloses an electromechanical brake. In this electromechanical brake, the housing of the transmission device is roughly herringbone shaped, and the brake motor is mounted on the legs of the herringbone transmission device housing. Two flanges are provided in the middle of the transmission device housing, and these two flanges are connected to the housing of the brake actuator (equivalent to a clamp body) by a pair of bolts. The two herringbone legs on the transmission device housing also form a cantilever section. Therefore, mounting the brake motor on the cantilever section of the transmission device housing will aggravate the vibration of the transmission device housing, thereby affecting the reliability of the electromechanical brake. Utility Model Content

[0006] In view of the above-mentioned defects of the prior art, the present invention provides an electromechanical brake that more easily avoids interference between the guide rod and the brake disc installed between the front pawl and the rear pawl.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] An electromechanical brake includes a mounting bracket, a caliper body, a brushless motor, and a transmission device. The mounting bracket includes a front caliper and a rear caliper. An outer brake pad is slidably mounted on the front caliper, and an inner brake pad is slidably mounted on the rear caliper. A vehicle brake disc is positioned between the front and rear caliper calipers. The caliper body is slidably connected to the mounting bracket via two guide rods. The caliper body has a piston cylinder, and a piston connected to the output end of the transmission device and axially slidable within the piston cylinder. The piston moves forward to push the inner brake pad against the brake disc. The front end of the caliper body has a hook portion located outside the outer brake pad, and the rear end of the caliper body has two caliper lugs. The two caliper lugs extend radially from the outer wall of the piston cylinder to both sides integrally. One guide rod connects one caliper lug to the rear caliper caliper of the mounting bracket, and the other guide rod connects the other caliper lug to the mounting bracket. The transmission device includes a transmission device housing, and the brushless motor is mounted on the transmission device housing. The transmission device housing is fixedly connected to the rear end of the caliper body by at least three screws.

[0009] Furthermore, at least two of the screws are disposed on both sides of the brushless motor, and at least two of the screws are disposed on both sides of the piston cylinder.

[0010] Furthermore, the transmission device is a gear reduction device, the output end of the brushless motor is connected to the input end of the transmission device, the output end of the transmission device is an output shaft, the output shaft extends into the piston cylinder and is connected to the piston through a motion conversion mechanism.

[0011] Furthermore, the brushless motor and the piston cylinder are located between two guide rods, and the axes of the brushless motor, the piston cylinder, and the two guide rods are all parallel to each other.

[0012] Furthermore, the guide rod closer to the brushless motor is called the first guide rod, and the guide rod closer to the piston cylinder is called the second guide rod. On a plane that is perpendicular to the axis of the piston cylinder, the axis of the brushless motor, and the axis of the first guide rod, let the projections of the axis of the piston cylinder, the axis of the brushless motor, and the axis of the first guide rod be points P, M, and G, respectively. Then 70°≤∠PMG≤180°.

[0013] Furthermore, a groove for arranging the brake disc is formed between the front pawl and the rear pawl, and the rear pawl is provided with a mounting hole for mounting to the vehicle body; another guide rod is connected between another caliper lug and the rear pawl of the mounting bracket.

[0014] Furthermore, one end of the guide rod is fixed to the rear jaw, and the other end is slidably engaged with the guide sleeve provided on the jaw body support; or, one end of one of the guide rods is fixed to the rear jaw (102), and the other end is slidably engaged with the guide sleeve (205) provided on the jaw body support (203), and one end of the other guide rod is fixed to the jaw body support (203), and the other end is slidably engaged with the guide sleeve provided on the rear jaw (102).

[0015] Furthermore, the front side of the transmission device housing is connected to the rear end of the clamp body, and the brushless motor is mounted on the front side of the transmission device housing.

[0016] Furthermore, the clamp body is provided with clearance space to avoid interference with the brushless motor.

[0017] Furthermore, the clearance space is a through hole and is provided on one of the clamp body lugs.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] In this invention, the mounting bracket includes a front caliper and a rear caliper. The front and rear caliper are used to house the vehicle's brake disc. The caliper body is slidably connected to the mounting bracket via two guide rods. The rear end of the caliper body has two caliper lugs, which extend radially from the outer wall of the piston cylinder to both sides. One of the guide rods connects one of the caliper lugs to the rear caliper of the mounting bracket. This design more easily prevents interference between the guide rod and the brake disc mounted between the front and rear caliper calipers.

[0020] The electromechanical brake of this invention includes a mounting bracket, a clamp body, a brushless motor, and a transmission device. The transmission device includes a transmission device housing, on which the brushless motor is mounted. The transmission device housing is fixedly connected to the rear end of the clamp body by at least three screws, with at least two screws located on both sides of the brushless motor and at least two screws located on both sides of the piston cylinder. This ensures a tight connection between the transmission device housing and the rear end of the clamp body, guaranteeing the flatness of the connection and enhancing the clamp body's support for the transmission device housing at the brushless motor mounting location. This effectively reduces vibration of the transmission device housing at the brushless motor mounting location, thereby reducing the risk of damage to the brushless motor or electronic control unit mounted on the transmission device housing. This improves the reliability of the electromechanical brake and ensures driving safety.

[0021] In this invention, the brushless motor and piston cylinder are located between two guide rods, and the axes of the brushless motor, the piston cylinder, and the two guide rods are all parallel to each other. The guide rod closer to the brushless motor is called the first guide rod, and the guide rod closer to the piston cylinder is called the second guide rod. On a plane perpendicular to the axes of the piston cylinder, the brushless motor, and the first guide rod, let the projections of the axes of the piston cylinder, the brushless motor, and the first guide rod be points P, M, and G, respectively, then ∠PMG ≥ 70°. The clamp body is slidably connected to the mounting bracket through the two guide rods. By setting the first guide rod closer to the brushless motor and setting ∠PMG to be greater than or equal to 70°, the support effect of the first guide rod on the clamp body at the position corresponding to the brushless motor can be enhanced, thereby improving the cantilever situation on the clamp body at the position corresponding to the brushless motor and providing more stable support for the transmission device housing.

[0022] In this invention, the front side of the transmission device housing is connected to the rear end of the clamp body, and the brushless motor is mounted on the front side of the transmission device housing. This avoids the arrangement difficulties caused by insufficient space when mounting the brushless motor on the rear side of the transmission device housing, and effectively reduces the overall structural size of this electromechanical brake. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the electromechanical brake in this utility model;

[0024] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure from another direction;

[0025] Figure 3 This is an exploded structural diagram of the electromechanical brake in this utility model;

[0026] Figure 4 This is a three-dimensional structural diagram of the clamp body in this utility model;

[0027] Figure 5 This is a three-dimensional structural diagram of the clamp body from another direction;

[0028] Figure 6 This is a top view of the mounting bracket in the electromechanical brake of this utility model.

[0029] Figure 7 A side view of the mounting bracket;

[0030] Figure 8 A schematic diagram of the structure after the brake disc is arranged between the inner and outer brake pads on the mounting bracket;

[0031] Figure 9This is a schematic diagram of the main structure of the electromechanical brake in this utility model;

[0032] Figure 10 for Figure 9 A schematic diagram of the cross-sectional structure along the AA direction;

[0033] Figure 11 for Figure 9 A cross-sectional view along the AA direction of another embodiment of the electromechanical brake shown.

[0034] The following are the annotations in the attached diagram: 1. Mounting bracket; 101. Front jaw; 102. Rear jaw; 103. Slot; 104. Mounting hole; 2. Clamp body; 201. Piston cylinder; 202. Hook; 203. Clamp body support lug; 204. Clearance space; 205. Guide sleeve; 3. Brushless motor; 4. Transmission device; 401. Transmission device housing; 5a. First guide rod; 5b. Second guide rod; 6a. Outer brake pad; 6b. Inner brake pad; 7a. First screw; 7b. Second screw; 7c. Third screw; 7d. Fourth screw; 8. Piston; 9. Brake disc. Detailed Implementation

[0035] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0036] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] like Figures 1-3As shown, an electromechanical brake includes a mounting bracket 1, a clamp body 2, a brushless motor 3, and a transmission device 4, such as... Figures 1-3 as well as Figures 6-8 As shown, the mounting bracket 1 includes a front chuck 101 and a rear chuck 102. An outer brake pad 6a is slidably mounted on the front chuck 101, and an inner brake pad 6b is slidably mounted on the rear chuck 102. The brake disc 9 of the vehicle is arranged between the front chuck 101 and the rear chuck 102. Figure 8 Preferably, a groove 103 for arranging the brake disc 9 is formed between the front pawl 101 and the rear pawl 102, and the rear pawl 102 is provided with a mounting hole 104 for fixing the mounting bracket 1 to the vehicle body.

[0039] like Figures 1-3 As shown, the clamp body 2 is slidably connected to the mounting bracket 1 via two guide rods. Specifically, the clamp body 2 is provided with two guide sleeves 205. One end of each guide rod is fixed to the mounting bracket 1, and the other end slides in engagement with the corresponding guide sleeve 205. In an embodiment not shown, the two guide sleeves can also be provided on the mounting bracket 1, with one end of each guide rod fixed to the clamp body 2 and the other end sliding in engagement with the corresponding guide sleeve on the mounting bracket 1.

[0040] like Figures 1-3 As shown, the clamp body 2 is provided with a piston cylinder 201, and the piston cylinder 201 is provided with a piston 8 that is connected to the output end of the transmission device 4 and can slide axially. The piston 8 moves forward and is used to push the inner brake pad 6b to press the brake disc 9. The front end of the clamp body 2 is provided with a hook 202 located outside (front) of the outer brake pad 6a.

[0041] like Figures 4-5 As shown, the rear end of the clamp body 2 is provided with two clamp body lugs 203, which are integrally formed by extending radially to both sides from the outer wall of the piston cylinder 201. Each guide sleeve 205 is provided at the end of one clamp body lug 203 for sliding engagement with one end of a corresponding guide rod. The other end of one guide rod is fixed to the rear jaw 102 of the mounting bracket 1, and the other end of the other guide rod is fixed to the mounting bracket 1. Preferably, the other end of the other guide rod is also fixed to the rear jaw 102 of the mounting bracket 1. Alternatively, one end of one of the guide rods is fixed to the rear jaw (102), and the other end slides in engagement with the guide sleeve (205) provided on the clamp body lug (203). One end of the other guide rod is fixed to the clamp body lug (203), and the other end slides in engagement with the guide sleeve provided on the rear jaw (102).

[0042] By connecting each guide rod between one of the caliper lugs 203 and the rear pawl 102 of the mounting bracket, interference between the two guide rods and the brake disc 9 installed between the front pawl 101 and the rear pawl 102 can be avoided.

[0043] The transmission device 4 includes a transmission device housing 401, and the brushless motor 3 is mounted on the transmission device housing 401. The transmission device housing 401 is fixedly connected to the rear end of the clamp body 2 by at least three screws. Figure 5 , Figure 10 and Figure 11 .

[0044] In one embodiment,

[0045] like Figure 5 , Figure 10 and Figure 11 As shown, at least two screws are located on both sides of the brushless motor 3, and at least two screws are located on both sides of the piston cylinder 201. This arrangement ensures a tight connection between the transmission housing 401 and the rear end of the clamp 2, guaranteeing a smooth connection between the transmission housing 401 and the rear end of the clamp 2. It also enhances the support provided by the clamp 2 to the transmission housing 401 at the mounting location of the brushless motor 3, effectively reducing vibration at this location. This further reduces the vibration of the transmission housing 401, making it less likely to damage the brushless motor 3 or electronic control unit mounted on the transmission housing 401. This improves the reliability of the electromechanical brake and ensures driving safety.

[0046] Preferably, such as Figure 9 , Figure 5 and Figure 10 As shown, the transmission device housing 401 is fixedly connected to the rear end of the clamp body 2 by four screws. Two of the screws are located on both sides of the brushless motor 3 and are respectively referred to as the first screw 7a and the second screw 7b. The second screw 7b is also located on one side of the piston cylinder 201, while the other two screws are located on the other side of the piston cylinder 201 and are respectively referred to as the third screw 7c and the fourth screw 7d.

[0047] Preferably, such as Figure 9 , Figure 11 As shown, the transmission device housing 401 is fixedly connected to the rear end of the clamp body 2 by three screws. Two of the screws are located on both sides of the brushless motor 3 and are respectively referred to as the first screw 7a and the second screw 7b. The second screw 7b is also located on one side of the piston cylinder 201, while the other screw is located on the other side of the piston cylinder 201 and is referred to as the third screw 7c.

[0048] In one embodiment, the transmission device 4 is a gear reduction device, the output end of the brushless motor 3 is connected to the input end of the transmission device 4, the output end of the transmission device 4 is an output shaft, the output shaft extends into the piston cylinder 201 and is connected to the piston 8 through a motion conversion mechanism, the motion conversion mechanism converts the rotation of the output shaft into the linear motion of the piston 8. Preferably, the motion conversion mechanism is a lead screw and nut mechanism.

[0049] like Figure 9 and Figure 10 As shown, in a preferred embodiment of this utility model, the brushless motor 3 and the piston cylinder 201 are located between two guide rods, and the axes of the brushless motor 3, the piston cylinder 201, and the two guide rods are all parallel to each other. Furthermore, the axes of the first screw 7a, the second screw 7b, the third screw 7c, and the fourth screw 7d are also parallel to the axis of the piston cylinder 201.

[0050] Among them, such as Figure 10 or Figure 11 As shown, the guide rod near the brushless motor 3 is called the first guide rod 5a, and the guide rod near the piston cylinder 201 is called the second guide rod 5b. On a plane perpendicular to the axes of the piston cylinder 201, the brushless motor 3, and the first guide rod 5a, let the projections of these axes be points P, M, and G, respectively. Then, 70° ≤ ∠PMG ≤ 180°. Since the clamp body 2 is slidably connected to the mounting bracket 1 via the two guide rods, by setting the first guide rod 5a near the brushless motor 3 and setting ∠PMG to be greater than or equal to 70°, the support effect of the first guide rod 5a on the clamp body 2 at the position corresponding to the brushless motor 3 can be enhanced, thereby improving the cantilever situation at the corresponding position on the clamp body 2. Preferably, when ∠PMG = 180°, the support effect of the first guide rod 5a on the clamp body 2 at the corresponding position to the brushless motor 3 can be maximized.

[0051] In one embodiment, such as Figure 1 , Figure 2 and Figure 9 As shown, the front side of the transmission housing 401 is connected to the rear end of the clamp body 2, and the brushless motor 3 is mounted on the front side of the transmission housing 401. This avoids the arrangement problem caused by insufficient space when mounting the brushless motor 3 on the rear side of the transmission housing 401, and at the same time effectively reduces the overall structural size of this electromechanical brake.

[0052] In one embodiment, such as Figures 3-5 As shown, the clamp body 2 is provided with a clearance space 204 to avoid interference with the brushless motor 3. Preferably, the clearance space 204 is a through hole and is provided on one of the clamp body lugs 203. This allows the housing part of the brushless motor 3 to pass through the through hole of the clearance space 204.

[0053] The working principle of the electromechanical brake in this utility model is as follows: When the vehicle needs to brake, the brushless motor 3 rotates, and the torque output by the brushless motor 3 is reduced and increased through the transmission device 4. Then, the rotation of the output shaft of the transmission device 4 is converted into linear motion through the motion conversion mechanism, which drives the piston 8 to slide axially relative to the piston cylinder 201. When the piston 8 moves forward in the piston cylinder 201, it pushes the inner brake pad 6b to slide forward relative to the rear pawl 102 of the mounting bracket 1, so that the inner brake pad 6b contacts and presses against the vehicle's brake disc 9. The brake disc 9 is subjected to the action of the inner brake pad 6b. The squeezing action applies a reverse force to the inner brake pad 6b, which in turn applies a reverse force to the piston 8 and the caliper 2. This causes the caliper 2 to slide backward relative to the mounting bracket 1 along the two guide rods. As the caliper 2's hook 202 slides backward relative to the mounting bracket 1, it pushes the outer brake pad 6a to slide backward relative to the front pawl 101 of the mounting bracket 1, so that the outer brake pad 6a also contacts and presses against the brake disc 9. In this way, the inner brake pad 6b and the outer brake pad 6a simultaneously exert a pressing and frictional effect on both sides of the brake disc 9, thus braking the wheel.

[0054] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. An electromechanical brake, comprising a mounting bracket (1), a clamp body (2), a brushless motor (3), and a transmission device (4), characterized in that: The mounting bracket (1) includes a front chuck (101) and a rear chuck (102). An outer brake pad (6a) is slidably disposed on the front chuck (101), and an inner brake pad (6b) is slidably disposed on the rear chuck (102). A vehicle brake disc (9) is arranged between the front chuck (101) and the rear chuck (102). The caliper body (2) is slidably connected to the mounting bracket (1) via two guide rods. A piston cylinder (201) is provided on the caliper body (2). The piston cylinder (201) contains a transmission device (4). The piston (8) is connected to the output end of the piston cylinder (201) and is axially sliding. The piston (8) moves forward and pushes the inner brake pad (6b) to press against the brake disc (9). The front end of the caliper (2) is provided with a hook (202) located outside the outer brake pad (6a). The rear end of the caliper (2) is provided with two caliper lugs (203). The two caliper lugs (203) are integrally formed by extending radially to both sides from the outer wall of the piston cylinder (201). One of the guide rods connects one of the caliper lugs (203) to the mounting bracket. Between the rear jaws (102), another guide rod is connected between another clamp body lug (203) and the rear jaws (102) of the mounting bracket; one end of the guide rod is fixed to the rear jaws (102), and the other end is slidably engaged with the guide sleeve (205) provided on the clamp body lug (203); or, one end of one guide rod is fixed to the rear jaws (102), and the other end is slidably engaged with the guide sleeve (205) provided on the clamp body lug (203), and one end of the other guide rod is fixed to the clamp body lug (203). 03) On the other end, it is slidably engaged with the guide sleeve set on the rear jaw (102); the brushless motor (3) and the piston cylinder (201) are located between the two guide rods, and the axis of the brushless motor (3), the axis of the piston cylinder (201) and the axis of the two guide rods are all parallel to each other; the transmission device (4) includes a transmission device housing (401), the brushless motor (3) is mounted on the transmission device housing (401), and the transmission device housing (401) is fixedly connected to the rear end of the clamp body (2) by at least three screws.

2. The electromechanical brake according to claim 1, characterized in that: At least two of the screws are located on both sides of the brushless motor (3) and at least two of the screws are located on both sides of the piston cylinder (201).

3. The electromechanical brake according to claim 1, characterized in that: The transmission device (4) is a gear reduction device. The output end of the brushless motor (3) is connected to the input end of the transmission device (4). The output end of the transmission device (4) is an output shaft. The output shaft extends into the piston cylinder (201) and is connected to the piston (8) through a motion conversion mechanism.

4. An electromechanical brake according to claim 1, characterized in that: The guide rod near the brushless motor (3) is called the first guide rod (5a), and the guide rod near the piston cylinder (201) is called the second guide rod (5b). On a plane that is perpendicular to the axis of the piston cylinder (201), the axis of the brushless motor (3), and the axis of the first guide rod (5a), let the projections of the axis of the piston cylinder (201), the axis of the brushless motor (3), and the axis of the first guide rod (5a) be points P, M, and G, respectively. Then 70°≤∠PMG≤180°.

5. An electromechanical brake according to claim 1, characterized in that: A groove (103) for arranging the brake disc (9) is formed between the front pawl (101) and the rear pawl (102), and the rear pawl (102) is provided with a mounting hole (104) for mounting to the vehicle body.

6. An electromechanical brake according to claim 1, characterized in that: The front side of the transmission device housing (401) is connected to the rear end of the clamp body (2), and the brushless motor (3) is mounted on the front side of the transmission device housing (401).

7. An electromechanical brake according to claim 6, characterized in that: The clamp (2) is provided with a clearance space (204) to avoid interference with the brushless motor (3).

8. An electromechanical brake according to claim 7, characterized in that: The clearance space (204) is a through hole and is provided on one of the clamp body lugs (203).

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