Electronic mechanical brake assembly and vehicle

Abstract

The invention relates to the technical field of automobile braking, and particularly provides an electronic mechanical braking assembly and a vehicle. The electronic mechanical brake assembly comprises a caliper frame, a caliper body, a friction plate and a driving unit, wherein the caliper body and the friction plate are arranged on the caliper frame; the driving unit comprises a motor and a driving piston which are arranged on the clamp body, and a gear transmission mechanism arranged between the motor and the driving piston; the driving piston is arranged corresponding to the friction plate and can push the friction plate to brake; the motor is arranged on one side of the driving piston in parallel, the gear transmission mechanism is connected to the motor and the end, away from the friction plate, of the driving piston, and a planetary gear set is arranged in the gear transmission mechanism. According to the electronic mechanical brake assembly, the planetary gear set is arranged in the gear transmission mechanism, the purposes of speed reduction and torque increase of gear transmission can be effectively achieved, the planetary gear set has the advantages of being compact in structure, small in occupied axial space and the like, and therefore the structural compactness of the electronic mechanical brake assembly can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive braking, and particularly to an electromechanical brake assembly. In addition, the present invention also relates to a vehicle. Background Art

[0002] An EMB (Electromechanical Brake) caliper brakes by combining electronics and mechanics; it uses electrical wire lines as the conduction medium for energy signals and an electric motor as the driving mechanism for braking.

[0003] In the current EMB structure, the piston is driven by a motor to move, so as to push the friction plate (brake pad) to perform the braking action; since there are more parts such as a motor, a transmission mechanism, a force sensor, and a wheel-end electronic control unit than in a traditional hydraulic caliper, the size in the piston axial direction is larger, while the space at the wheel end is limited, making the matching more difficult. Moreover, most of the current EMB structures use a ring-shaped force sensor, which has a large axial space and low sensor accuracy.

[0004] In addition, in the existing EMB structure, in order to convert the rotation of the motor into the linear movement of the piston, an anti-rotation structure is provided between the piston and the insert, which further increases the length of the entire brake in the piston axial direction. The parking structure in the EMB structure is also relatively complex, with a risk of easy failure and higher manufacturing costs. Summary of the Invention

[0005] In view of this, the present invention aims to provide an electromechanical brake assembly to improve the structural compactness of the electromechanical brake assembly.

[0006] To achieve the above object, the technical solution of the present invention is realized as follows:

[0007] An electromechanical brake assembly includes a caliper bracket, a caliper body and a friction plate provided on the caliper bracket, and a driving unit;

[0008] The driving unit includes a motor and a driving piston provided on the caliper body, and a gear transmission mechanism provided between the motor and the driving piston; the driving piston is arranged corresponding to the friction plate and can push the friction plate to perform a braking action; the motor is arranged parallel to one side of the driving piston, and the gear transmission mechanism is connected to the motor and the end of the driving piston away from the friction plate.

[0009] Furthermore, a planetary gear set is provided in the gear transmission mechanism; the planetary gear set is provided at the end of the motor, the ring gear of the planetary gear set is pressed onto the caliper body, the center wheel of the planetary gear set is provided on the output shaft of the motor, and the planet carrier of the planetary gear set is connected to the driving piston through a gear set; or, the planetary gear set is provided at the end of the driving piston, the ring gear of the planetary gear set is connected to the motor through a gear set, the center wheel of the planetary gear set is fixedly connected to the driving piston, and the planet carrier of the planetary gear set is fixedly mounted on the caliper body.

[0010] Furthermore, the driving piston includes an inner piston that rotates under the drive of the gear transmission mechanism, and an outer piston that is sleeved on the inner piston, and the outer piston is abutted and connected with the friction plate; the outer piston and the inner piston are connected by a screw structure, and an anti-rotation structure that limits the rotation of the outer piston is provided between the outer piston and the friction plate.

[0011] Furthermore, the end of the outer piston is provided with a piston end cover for abutting the friction plate, and the anti-rotation structure includes an anti-rotation rod provided on the piston end cover, and an anti-rotation groove provided on the friction plate; the anti-rotation rod is extended along the direction in which the driving piston pushes the friction plate, and is inserted in the anti-rotation groove.

[0012] Furthermore, a stop structure is provided between the outer piston and the inner piston. When the inner piston drives the outer piston away from the friction plate to a set limit position, the stop structure limits the continued rotation of the inner piston.

[0013] Furthermore, the stop structure is provided on a stop platform on the outer piston, and a stop block is provided on the inner piston; when the outer piston reaches the limit position, the stop block is blocked on the stop platform, constituting a restriction on the continued rotation of the inner piston.

[0014] Furthermore, it also includes a parking mechanism arranged between the caliper body and the gear transmission mechanism; the parking mechanism is located on the side of a gear in the gear transmission mechanism facing the friction plate, including a parking groove arranged on the gear, and a parking push rod movably arranged on the caliper body; when the gear transmission mechanism drives the driving piston to push the friction plate to complete braking, the parking push rod can be controlled to be inserted into the parking groove to keep the driving piston in the current position.

[0015] Furthermore, it also includes a force sensor arranged between the driving piston and the caliper body; the force sensor is used to detect the braking force applied by the driving piston to the friction plate.

[0016] Further, the force sensor is a button-type force sensor; the force sensor is fixedly installed on the pliers body through a sensor flange, and a thrust needle bearing is provided between the driving piston and the force sensor.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] (1) For the electromechanical brake assembly of the present invention, a gear transmission mechanism is adopted to realize the speed reduction and torque increase transmission between the motor and the driving piston, and the high-speed rotation of the motor can be converted into the low-speed and high-torque rotation on one side of the driving piston, so as to provide sufficient braking force when the driving piston converts the rotational motion into a linear motion to push the friction plate; by arranging a planetary gear set in the gear transmission mechanism, the purpose of speed reduction and torque increase of the gear transmission can be effectively achieved, and the planetary gear set itself has the advantages of compact structure and small occupied axial space, so that the structural compactness of the electromechanical brake assembly can be effectively improved.

[0019] (2) By arranging the planetary gear set at the end of the driving piston or the motor, and then drivingly connecting the motor and another component through the gear set, an efficient and compact speed reduction and torque increase transmission structure can be formed between the motor and the driving piston; through the above transmission arrangement, in addition to assembling the planetary gear set into the inner cavity of the pliers body, in the axial direction of the driving piston, the gear set only needs to occupy the space of one gear thickness, greatly reducing the axial dimension of the electromechanical brake assembly, being more suitable for the narrow installation space conditions at the wheel end, and being beneficial to the arrangement of the electromechanical brake assembly at the brake disc at the wheel end.

[0020] (3) The driving piston adopts a nested structure of an outer piston and an inner piston. By using the lead screw transmission structure between the outer piston and the inner piston, the rotational motion of the inner piston can be converted into the linear motion of the outer piston, and the linear motion of the outer piston is used to push the friction plate, so that the friction plate completes the braking action.

[0021] (4) By arranging an anti-rotation groove on the friction plate (specifically, on the inner friction plate), the anti-rotation and linear motion guiding effects of the outer piston can be realized. A piston end cover is arranged at the end of the outer piston, which is beneficial to increasing the pushing contact area of the outer piston on the inner friction plate, making the force on the inner friction plate more balanced; an anti-rotation rod is arranged on the piston end cover, and the anti-rotation rod is inserted into the anti-rotation groove. Of course, the anti-rotation groove should also be arranged along the pushing direction of the outer piston. The anti-rotation groove can be designed as a notch form penetrating the thickness of the friction plate, which is more convenient for processing and construction; the cooperation of the anti-rotation rod and the anti-rotation groove can efficiently realize the restriction of the rotation of the outer piston and the guiding effect of the linear motion of the outer piston.

[0022] (5) By arranging a stop structure between the outer piston and the inner piston, a limiting effect on the rotation of the inner piston to the extreme position can be formed. When the outer piston retracts to the extreme position, it blocks the continuous rotation of the inner piston, which can effectively prevent the situation of jamming between the inner piston and the outer piston. The stop structure and the anti-rotation structure cooperate with each other. With the non-rotatable structure of the outer piston, it is beneficial for the stop structure to form a rotational limit on the inner piston, providing good conditions for effectively streamlining the structure of the stop structure, and further improving the structural compactness level of the electro-mechanical brake assembly.

[0023] (6) The stop structure is arranged between the cylinder blocks of the outer piston and the inner piston. The stop block can be integrally formed on the cylinder block of the inner piston, and the stop platform can also be directly machined to the end position of the cylinder block of the outer piston. The structure is simple and efficient, does not occupy the axial and radial spaces of the driving piston, and there is no need to set relevant structures on the caliper body, which can make the structure more compact and facilitate the processing of the structure.

[0024] (7) A parking mechanism is arranged between the caliper body and the gear transmission mechanism. By inserting the parking push rod into the parking groove on the gear, the rotation of the gear can be restricted, and then the entire gear transmission mechanism can be locked. The outer piston will thus be restricted in the braking position, so that the friction plate maintains the braking state of clamping the brake disc. The parking mechanism is arranged on the side of the gear facing the friction plate, which can make full use of the clearance space between the driving piston and the motor, avoid occupying the space on the side of the gear opposite to the friction plate, save the space in the axial direction of the driving piston, and thus effectively reduce the axial dimension of the electro-mechanical brake assembly.

[0025] (8) A force sensor is arranged between the caliper body and the driving piston, which can detect the braking force of the electro-mechanical brake assembly on the brake disc in real time, and is beneficial to improving the braking safety and reliability of the vehicle.

[0026] (9) By adopting a button-type force sensor, the force sensor and the thrust needle bearing can be arranged inside the inner piston. The other end of the force sensor abuts against the bottom of the inner cavity of the caliper body, effectively reducing the axial length of the assembly; the diameter of the force sensor is small, and it can more fully detect the force within the braking radius range. With the same accuracy of the force sensor, the force between the driving piston and the caliper body can be more accurately transmitted to the force sensor, thereby improving the detection accuracy of the force sensor.

[0027] Another object of the present invention is to provide a vehicle that adopts the electro-mechanical brake assembly of the present invention. The vehicle of the present invention has the technical advantages possessed by the above electro-mechanical brake assembly. Description of the Drawings

[0028] The accompanying drawings, which form a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof are for explaining the present invention. The front-back, up-down, and other orientation terms involved are only used to represent relative positional relationships and do not constitute improper limitations to the present invention. In the drawings:

[0029] Figure 1 is a schematic cross-sectional structure diagram of the overall electro-mechanical brake assembly according to an embodiment of the present invention;

[0030] Figure 2 is a schematic assembly structure diagram of the drive piston, motor, and gear transmission mechanism according to an embodiment of the present invention;

[0031] Figure 3 is a schematic assembly structure diagram of another form of drive piston, motor, and gear transmission mechanism;

[0032] Figure 4 is a schematic cross-sectional structure diagram of the parking mechanism according to an embodiment of the present invention;

[0033] Figure 5 is Figure 4 a partial enlarged view of the part shown at B in

[0034] Figure 6 is a three-dimensional structure diagram of the anti-rotation structure and related components according to an embodiment of the present invention;

[0035] Figure 7 is Figure 6 the front view of the components shown;

[0036] Figure 8 is a structure diagram of the stop structure and related components according to an embodiment of the present invention;

[0037] Figure 9 is Figure 1 a partial enlarged view of the part shown at A in

[0038] Explanation of reference numerals:

[0039] 1. Caliper body; 100. Inner cavity;

[0040] 2. Caliper bracket; 3. Friction plate; 31. Inner friction plate; 311. Anti-rotation groove; 32. Outer friction plate;

[0041] 4. Return spring; 5. Yoke spring; 6. Piston end cover; 61. Anti-rotation rod;

[0042] 7. Outer piston; 71. Stop platform; 8. Inner piston; 81. Stop block; 9. Guide pin protective sleeve;

[0043] 10. Guide pin; 11. Thrust needle roller bearing;

[0044] 12. Force sensor; 121. Sensor spacer; 122. Sensor flange;

[0045] 13. Guide pin bolt; 14. Sealing ring; 15. Return ball bearing; 151. Ball bearing gasket;

[0046] 16. Wheel end controller; 17. Bolt; 18. Small bolt;

[0047] 19. Parking electromagnet; 191. Parking push rod;

[0048] 20. Gear transmission mechanism; 201. First-stage transmission pinion gear; 202. First-stage transmission large gear; 2021. Parking groove; 203. Second-stage transmission pinion gear; 204. Second-stage transmission large gear;

[0049] 21. Ball bearing; 22. Planetary gear set; 221. Ring gear; 222. Planet carrier; 223. Planet gear;

[0050] 23. Motor. Specific implementation manners

[0051] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0052] In the description of the present invention, it should be declared that if terms indicating orientation or positional relationship such as "upper, lower, left, right, front, rear, inner, outer" appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0053] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connector" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with the specific circumstances.

[0054] The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0055] Embodiment 1

[0056] This embodiment relates to an electro-mechanical brake assembly, which can improve the structural compactness of the electro-mechanical brake assembly; an exemplary structure thereof is as Figure 1 shown.

[0057] Overall, the electro-mechanical brake assembly includes a caliper carrier 2, a caliper body 1 and a friction plate 3 disposed on the caliper carrier 2, and a drive unit. Among them, the drive unit includes a motor 23 and a drive piston disposed on the caliper body 1, and a gear transmission mechanism 20 disposed between the motor 23 and the drive piston; the drive piston is arranged corresponding to the friction plate 3 and can push the friction plate 3 to perform a braking action. The motor 23 is arranged parallel to one side of the drive piston, and the gear transmission mechanism 20 is connected to one end of the motor 23 and the drive piston away from the friction plate 3.

[0058] It should be noted that based on the above overall design concept, the technical solution of the present invention can adopt a variety of different specific implementation structures, forms or configuration sequences. For example, the above gear transmission mechanism 20 can adopt a set of gear transmissions, or multiple sets of gear transmissions, and a planetary gear set 22 can be provided in the gear transmission mechanism 20; the planetary gear set 22 can be provided on one side of the drive piston or on one side of the motor 23. The specific setting sequence, assembly method, etc. of the caliper body 1, caliper carrier 2, friction plate 3, motor 23, drive piston, etc. can also be flexibly adjusted. For parts required for the implementation of the overall solution but not involved in the above overall setting, reasonable and flexible design can be made with reference to mature setting means in the art, actual situations during implementation, etc. The following specific implementation solutions of this embodiment are only one of the relatively better solutions among the many solutions that can be formed by the above various combinations and their variations. In actual implementation, those skilled in the art can make flexible adjustments and improvements in combination with the actual situation. Obviously, the many solutions that can be formed by the above various specific form combinations and their variations, as well as the specific implementation solutions of this embodiment, are all within the protection scope of the present invention.

[0059] In the case of the above overall setting, the clamp bracket 2 can be fixedly installed on the axle body of the vehicle; the clamp body 1 is installed on the clamp bracket 2, and a guide pin 10 is arranged on the clamp bracket 2. The clamp body 1 is installed on the clamp bracket 2 through the guide pin 10, allowing the clamp body 1 to move along the guide pin 10 on the clamp bracket 2; the two ends on both sides of the clamp body 1 are connected to the guide pin 10 through guide pin bolts 13. A guide pin protective sleeve 9 can be sleeved on the guide pin 10 to play a role in dust prevention and protection. A yoke spring 5 is arranged on the clamp bracket 2 for the friction plate 3. The friction plate 3 includes an inner friction plate 31 and an outer friction plate 32, and a return spring 4 is arranged between the inner friction plate 31 and the outer friction plate 32 to facilitate controlling the return of the friction plate 3 when released by the driving piston. The motor 23 is fixed on the clamp body 1 and can reduce speed and increase torque through a two-stage gear transmission with a first-stage planetary gear set 22, transmitting the rotation of the motor 23 to the inner piston 8; a ball bearing 21 can be arranged at the output shaft of the motor 23 to improve the rotational stability of the output shaft. The outer piston 7 is movably arranged between the inner piston 8 and the friction plate 3 and is restricted from rotating. When the inner piston 8 rotates, the outer piston 7 can only move linearly, pushing the friction plate 3 to clamp the brake disc to achieve the braking function. At the same time, a wheel-end controller 16 can be arranged on the electro-mechanical brake assembly to control the rotation of the motor 23.

[0060] As already mentioned above, the planetary gear set 22 can be arranged on the side of the driving piston or on the side of the motor 23. When the planetary gear set 22 is arranged on the side of the motor 23, it can be as Figure 2 shown, the planetary gear set 22 is arranged at the end of the motor 23, the ring gear 221 of the planetary gear set 22 is press-fitted on the clamp body 1, the central gear of the planetary gear set 22 is arranged on the output shaft of the motor 23, and the planet carrier 222 of the planetary gear set 22 is connected to the driving piston through a gear set transmission; a plurality of planet gears 223 are arranged on the planet carrier 222, and each planet gear 223 meshes and transmits between the ring gear 221 and the central gear of the planetary gear set 22. Among them, the gear set can adopt a one-stage or two-stage gear transmission. In this embodiment, as Figure 2 shown, the gear set is a two-stage transmission, including a first-stage transmission pinion 201 fixedly installed on the planet carrier 222, a first-stage transmission gear 202 meshing with the first-stage transmission pinion 201, the first-stage transmission gear 202 is fixedly connected to a second-stage transmission pinion 203 through a shaft body, and the second-stage transmission pinion 203 meshes with a second-stage transmission gear 204 on the driving piston, driving the inner piston 8 in the driving piston to rotate.

[0061] When the planetary gear set 22 is arranged on the side of the driving piston, it can be as Figure 3As shown, the planetary gear set 22 is arranged at the end of the driving piston, the ring gear 221 of the planetary gear set 22 is connected to the motor 23 through the gear set transmission, the central gear of the planetary gear set 22 is fixedly connected to the driving piston, and the planet carrier 222 of the planetary gear set 22 is fixedly mounted on the caliper body 1. The gear set here also adopts a two-stage gear transmission, such as Figure 3 As shown, the gear set includes a primary transmission pinion 201 fixedly mounted on the output shaft of the motor 23, a primary transmission gear 202 meshing with the primary transmission pinion 201, the primary transmission gear 202 is fixedly connected to a secondary transmission pinion 203 through a shaft, and the secondary transmission pinion 203 cooperates with the planetary gear set 22 on the driving piston to drive the inner piston 8 in the driving piston to rotate.

[0062] By arranging the planetary gear set 22 at the end of the driving piston or the motor 23, and then connecting the motor 23 to another component through the gear set, an efficient and compact speed reduction and torque increase transmission structure can be formed between the motor 23 and the driving piston; through the above transmission arrangement, in addition to assembling the planetary gear set 22 into the inner cavity 100 of the caliper body 1, in the axial direction of the driving piston, the gear set only needs to occupy a space of the thickness of a gear, which greatly reduces the axial size of the electronic mechanical brake assembly, is more suitable for the narrow installation space conditions at the wheel end, and is conducive to the arrangement of the electronic mechanical brake assembly at the wheel end brake disc. In addition, when the motor 23 and the driving piston are assembled to the caliper body 1, a sealing ring 14 can be arranged at the assembly end surface of the caliper body 1, the driving piston and the motor 23, so as to form a closed inner cavity 100 for arranging the gear transmission mechanism 20 inside the caliper body 1. A piston dust cover can also be arranged at the joint of the inner piston 8 and the outer piston 7 to prevent dust from entering the transmission structure between the outer piston 7 and the inner piston 8.

[0063] like Figure 4 , Figure 5 As shown, the electronic mechanical brake assembly of this embodiment also includes a parking mechanism disposed between the caliper body 1 and the gear transmission mechanism 20. The parking mechanism is located on the side of a certain gear in the gear transmission mechanism 20 facing the friction plate 3, and includes a parking groove 2021 disposed on the gear, and a parking push rod 191 movably disposed on the caliper body 1. When the gear transmission mechanism 20 drives the driving piston to push the friction plate 3 to complete the braking, the parking push rod 191 can be manipulated to be inserted into the parking groove 2021 to keep the driving piston at the current position.

[0064] Specifically, the telescopic movement of the parking push rod 191 can be driven and controlled by the parking electromagnet 19 provided on the pliers body 1. Both the parking electromagnet 19 and the parking push rod 191 are arranged below the first-stage transmission large gear 202 and fixed on the pliers body 1. When parking, the parking push rod 191 is pushed out and clamped into the parking groove 2021 of the first-stage transmission large gear 202, clamping the first-stage transmission large gear 202 and locking the entire gear transmission mechanism 20, so that the outer piston 7 cannot retract, realizing the parking function. The parking electromagnet 19 and the parking push rod 191 are located in the parallel position of the gear transmission mechanism 20, without occupying the axial space of the assembly. Compared with the existing ratchet and pawl parking structure, the total length can be effectively shortened, which is beneficial to the matching of the assembly on the vehicle. Among them, there are multiple parking grooves 2021 densely arranged along the circumferential direction of the first-stage transmission large gear 202, and any one of the parking grooves 2021 can cooperate with the parking push rod 191, so that the parking function can be realized at any position. The parking groove 2021 can be designed in the form of a wedge-shaped groove, and of course, the end of the parking push rod 191 is also designed as a wedge shape. The abutting surface that abuts and cooperates with the parking push rod 191 in the parking groove 2021 can be arranged perpendicular to the end face of the first-stage transmission large gear 202; however, it is preferably slightly inclined, that is, the included angle a between the abutting surface and the end face of the first-stage transmission large gear 202 is less than 90°, which can effectively prevent the parking push rod 191 from disengaging from the parking groove 2021.

[0065] A parking mechanism is arranged between the pliers body 1 and the gear transmission mechanism 20. By inserting the parking push rod 191 into the parking groove 2021 on the gear, the rotation of the gear can be restricted, and then the entire gear transmission mechanism 20 can be clamped. The outer piston 7 will then be restricted in the braking position, so that the friction plate 3 maintains the braking state of clamping the brake disc. The parking mechanism is arranged on the side of the gear facing the friction plate 3, which can make full use of the clearance space between the driving piston and the motor 23, avoid occupying the space on the side of the gear facing away from the friction plate 3, save the axial space of the driving piston, and then effectively reduce the axial dimension of the electromechanical brake assembly.

[0066] Regarding the setting of the driving piston, of course, there are various different structural schemes to choose from. In this embodiment, still as Figure 1 shown, the driving piston includes an inner piston 8 that rotates under the drive of the gear transmission mechanism 20, and an outer piston 7 sleeved on the inner piston 8. The outer piston 7 is in contact and connected with the friction plate 3. In this embodiment, a lead screw structure is used for the transmission connection between the outer piston 7 and the inner piston 8, and an anti-rotation structure for restricting the rotation of the outer piston 7 is provided between the outer piston 7 and the friction plate 3; in this way, the rotational movement of the inner piston 8 can be converted into the linear movement of the outer piston 7.

[0067] The driving piston adopts a structural form of a nested outer piston 7 and an inner piston 8. By using the lead screw transmission structure between the outer piston 7 and the inner piston 8, the rotational motion of the inner piston 8 can be converted into the linear motion of the outer piston 7. The linear motion of the outer piston 7 is used to push against the friction plate 3, so that the friction plate 3 completes the braking action. In actual application, the friction plate 3 includes an inner friction plate 31 and an outer friction plate 32 respectively arranged on both sides of the brake disc. The two friction plates 3 are slidably arranged on the caliper 2. The outer piston 7 is arranged corresponding to the inner friction plate 31 on the inner side of the inner friction plate 31. When the inner friction plate 31 is pushed, the inner friction plate 31 and the outer friction plate 32 approach each other to form a clamping force on the brake disc, thus realizing the braking action. An anti-rotation structure is arranged between the inner friction plate 31 and the outer piston 7 to limit the rotation of the outer piston 7. In this way, when the inner piston 8 rotates, the outer piston 7 can be driven to move linearly, realizing the pushing drive of the inner friction plate 31. The anti-rotation structure is arranged between the inner friction plate 31 and the outer piston 7, rather than between the caliper body 1 and the outer piston 7. The anti-rotation structure and the gear transmission mechanism 20 are respectively located at both ends of the driving piston, which can avoid the situation that the anti-rotation structure and the gear transmission mechanism 20 need to be centrally arranged and affect each other. While simplifying the structural design of the gear transmission mechanism 20, the occupation of the axial space of the driving piston by the anti-rotation structure is avoided, thereby further improving the structural compactness of the electromechanical brake assembly.

[0068] Specifically, as Figure 6 、 Figure 7 shown, the end of the outer piston 7 is provided with a piston end cover 6 for abutting against the friction plate 3. The anti-rotation structure includes an anti-rotation rod 61 arranged on the piston end cover 6 and an anti-rotation groove 311 arranged on the friction plate 3; the anti-rotation rod 61 extends along the direction in which the driving piston pushes against the friction plate 3 and is inserted into the anti-rotation groove 311.

[0069] By arranging the anti-rotation groove 311 on the friction plate 3 (specifically on the inner friction plate 31), the anti-rotation of the outer piston 7 and the guiding effect of the linear motion can be realized. The piston end cover 6 is arranged at the end of the outer piston 7, which is beneficial to increasing the pushing contact area of the outer piston 7 on the inner friction plate 31 and making the force on the inner friction plate 31 more balanced; the anti-rotation rod 61 is arranged on the piston end cover 6, and the anti-rotation rod 61 is inserted into the anti-rotation groove 311. Of course, the anti-rotation groove 311 should also be arranged along the pushing direction of the outer piston 7. The anti-rotation groove 311 can be designed as a notch form penetrating the thickness of the friction plate 3, which is more convenient for processing and construction; the cooperation of the anti-rotation rod 61 and the anti-rotation groove 311 can efficiently realize the limitation of the rotation of the outer piston 7 and the guiding effect of the linear motion of the outer piston 7.

[0070] Based on the above settings, combined with Figure 8As shown, a stop structure is further provided between the outer piston 7 and the inner piston 8 of this embodiment. When the inner piston 8 drives the outer piston 7 away from the friction plate 3 to a set limit position, the stop structure constitutes a restriction on the continuous rotation of the inner piston 8. By providing a stop structure between the outer piston 7 and the inner piston 8, a limiting effect on the inner piston 8 rotating to the limit position can be formed. When the outer piston 7 retracts to the limit position, it blocks the inner piston 8 from continuing to rotate, which can effectively prevent the situation of jamming between the inner piston 8 and the outer piston 7. The stop structure and the anti-rotation structure cooperate with each other. With the non-rotatable structure setting of the outer piston 7, it is beneficial for the stop structure to form a rotational limit on the inner piston 8, providing good conditions for effectively streamlining the structure of the stop structure, and further improving the structural compactness level of the electromechanical brake assembly.

[0071] Of course, there are various different structural schemes for the setting of the stop structure. In this embodiment, the stop structure includes a stop platform 71 provided on the outer piston 7 and a stop block 81 provided on the inner piston 8. When the outer piston 7 reaches the above-mentioned limit position, the stop block 81 is blocked on the stop platform 71, constituting a restriction on the continuous rotation of the inner piston 8. By setting the stop structure between the cylinder bodies of the outer piston 7 and the inner piston 8, the stop block 81 can be integrally formed on the cylinder body of the inner piston 8, and the stop platform 71 can also be directly machined to the end position of the cylinder body of the outer piston 7. The structure is simple and efficient, does not occupy the axial and radial spaces of the driving piston, and there is no need to set relevant structures on the caliper 1, which can make the structure more compact and is convenient for processing and construction.

[0072] In addition, as Figure 1 and in combination with Figure 9 shown, the electromechanical brake assembly of this embodiment further includes a force sensor 12 provided between the driving piston and the caliper 1; the force sensor 12 is used to detect the braking force applied by the driving piston to the friction plate 3. By setting the force sensor 12 between the caliper 1 and the driving piston, the braking force of the electromechanical brake assembly on the brake disc can be detected in real time, which is beneficial to improving the braking safety and reliability of the vehicle.

[0073] Specifically, the force sensor 12 in this embodiment adopts a button-type force sensor; the force sensor 12 is fixedly installed on the clamp body 1 through a sensor flange 122, and a thrust needle bearing 11 is provided between the driving piston and the force sensor 12. Compared with the existing brake assemblies that mostly adopt ring-shaped force sensors, the force sensor 12 in this embodiment adopts a button-type force sensor, which has the advantage of higher detection accuracy. The existing ring-shaped force sensors are relatively easy to arrange, but they increase the axial length of the assembly. Moreover, due to the large diameter of the ring-shaped force sensors, the clamping forces exerted by the driving piston and the clamp body 1 on the assembly are likely to cause deformation of the assembly, resulting in a reduction in the accuracy of the measured force. The electro-mechanical brake assembly of the present invention adopts a button-type force sensor, which can arrange the force sensor 12 and the thrust needle bearing 11 inside the inner piston 8. The other end of the force sensor 12 abuts against the bottom of the inner cavity 100 of the clamp body 1, effectively reducing the axial length of the assembly; the diameter of the force sensor 12 is smaller, and it can more fully detect the force within the braking radius. With the same accuracy of the force sensor, the acting force between the driving piston and the clamp body 1 can be more accurately transmitted to the force sensor 12, thereby improving the detection accuracy of the force sensor 12.

[0074] In the existing EMB brake caliper assembly, due to the use of a ring-shaped sensor, the lead screw of the ball screw passes through the ring-shaped force sensor and the through hole at the bottom of the cylinder hole of the clamp body 1. A snap ring is assembled outside the through hole of the clamp body 1 to prevent the lead screw from being pulled out. During the clamping operation of the brake caliper assembly, the stepped part of the lead screw pushes the force sensor, and the force sensor presses against the bottom of the cylinder hole of the clamp body 1 to generate a braking force. During the brake release process, the piston retracts, the lead screw is subjected to a reverse force, and the snap ring limits the position, so that the lead screw cannot be pulled out and pulls the piston back to its original position. This arrangement form not only makes the force on the force sensor uneven, but also occupies a large axial dimension space of the assembly.

[0075] The button-type force sensor 12 in this embodiment has no central hole and does not require the setting of a related lead screw. As Figure 9As shown in the figure, the force sensor 12 is mounted on the pliers body 1 through the sensor flange 122; there is a sensor cushion block 121 on the force sensor 12, the sensor cushion block 121 abuts against the sensor flange 122, and the sensor flange 122 is closely attached to the bottom surface of the cylinder hole of the inner cavity 100 of the pliers body 1. The bolt 17 fixes the sensor flange 122 on the pliers body 1. At the same time, a return ball bearing 15 is provided between the pliers body 1 and the inner piston 8, and the inner piston 8 and the ball bearing gasket 151 are fixed together by a small bolt 18; in this way, the inner piston 8 can rotate freely relative to the pliers body 1. During the operation of the electromechanical brake assembly to clamp the brake disc, the inner piston 8 pushes the thrust needle roller bearing 11 located between the force sensor 12 and the inner piston 8, and then transmits the thrust to the force sensor 12; the thrust needle roller bearing 11 plays a role in allowing relative rotation between the inner piston 8 and the force sensor 12. The thrust is transmitted to the sensor cushion block 121 and the sensor flange 122 through the force sensor 12, and then transmitted to the bottom surface of the pliers body 1. During the brake release process, the outer piston 7 retracts, and the inner piston 8 receives a reverse force, which is transmitted to the ball bearing gasket 151 and the return ball bearing 15. The return ball bearing 15 is restricted by the sensor cushion block 121 in the axial movement of the inner piston 8, and the outer piston 7 is pulled back by the inner piston 8. During the entire braking process, the force sensor 12 can accurately detect the magnitude of the braking force.

[0076] In summary, for the electromechanical brake assembly of this embodiment, the gear transmission mechanism 20 is adopted to realize the speed reduction and torque increase transmission between the motor 23 and the driving piston, and the high-speed rotation of the motor 23 can be converted into the low-speed and high-torque rotation on the side of the driving piston, so as to provide sufficient braking force when the driving piston converts the rotational motion into the linear motion of pushing the friction plate 3; by arranging the planetary gear set 22 in the gear transmission mechanism 20, the purpose of speed reduction and torque increase of the gear transmission can be effectively realized, and the planetary gear set 22 itself has the advantages of compact structure and small axial space occupation, thus effectively improving the structural compactness of the electromechanical brake assembly.

[0077] Embodiment 2

[0078] This embodiment relates to a vehicle, and the vehicle adopts the electromechanical brake assembly provided in Embodiment 1.

[0079] The electro-mechanical brake assembly of the present invention is adopted at the wheel end of a vehicle and can cooperate with brake pads to well achieve the braking and parking functions. In the electro-mechanical brake assembly of the present invention, the transmission structure of the gear transmission mechanism 20 can make the axial dimension of the driving piston smaller, and the space matching is easier, solving the problems of larger axial dimension of the assembly and difficult matching. Moreover, by replacing the type of sensor, the force sensor 12 in the assembly of the present invention has a more concentrated force detection point and higher accuracy than the annular sensor. The anti-rotation structure adopts the cooperation of the friction plate 3 and the outer piston 7, and in combination with the stop structure arranged between the outer piston 7 and the inner piston 8, it is not only compact and effective, convenient for processing, but also reduces the axial length dimension of the assembly, making the matching layout of the assembly in the narrow space at the wheel end easier.

[0080] In addition, the parking mechanism in the assembly makes full use of the clearance space between the driving piston and the motor 23. Through the cooperation of the parking electromagnet 19, the driving parking push rod 191 and the parking groove 2021, it is simple and reasonable, does not occupy the axial space of the assembly, effectively shortens the axial length of the assembly, and is beneficial to the installation and matching of the assembly in the whole vehicle.

[0081] The above are only the preferred embodiments of the present invention. The detailed explanation of the configuration, the examples of specific structural settings, or the expressions of the assembly connection methods, etc. are all for the need of full disclosure, so that those skilled in the art can better implement the present invention, rather than to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electromechanical brake assembly, characterized in that: It comprises a clamp frame (2), a clamp body (1) and a friction plate (3) arranged on the clamp frame (2), and a driving unit; The driving unit comprises a motor (23) and a driving piston arranged on the caliper body (1), and a gear transmission mechanism (20) arranged between the motor (23) and the driving piston; The driving piston is arranged corresponding to the friction plate (3) and is capable of pushing the friction plate (3) to perform a braking action; The motor (23) is arranged in parallel on one side of the driving piston, and the gear transmission mechanism (20) is connected to the motor (23) and an end of the driving piston away from the friction plate (3).

2. The electromechanical brake assembly according to claim 1, characterized in that: The gear transmission mechanism (20) is provided with a planetary gear set (22); The planetary gear set (22) is arranged at the end of the motor (23), the ring gear (221) of the planetary gear set (22) is pressed onto the caliper body (1), the center wheel of the planetary gear set (22) is arranged on the output shaft of the motor (23), and the planet carrier (222) of the planetary gear set (22) is connected to the driving piston through a gear set; Alternatively, the planetary gear set (22) is disposed at the end of the driving piston, the ring gear (221) of the planetary gear set (22) is connected to the motor (23) via a gear set transmission, the center gear of the planetary gear set (22) is fixedly connected to the driving piston, and the planet carrier (222) of the planetary gear set (22) is fixedly mounted on the caliper body (1).

3. The electromechanical brake assembly according to claim 1, characterized in that: The driving piston comprises an inner piston (8) which rotates under the driving of the gear transmission mechanism (20), and an outer piston (7) which is sleeved on the inner piston (8), and the outer piston (7) is in abutment with and connected to the friction plate (3); The outer piston (7) and the inner piston (8) are connected to each other by a screw structure, and an anti-rotation structure for limiting the rotation of the outer piston (7) is provided between the outer piston (7) and the friction plate (3).

4. The electromechanical brake assembly according to claim 3, characterized in that: The end of the outer piston (7) is provided with a piston end cover (6) for abutting against the friction plate (3); the anti-rotation structure comprises an anti-rotation rod (61) provided on the piston end cover (6), and an anti-rotation groove (311) provided on the friction plate (3); the anti-rotation rod (61) is extended along the direction in which the driving piston pushes the friction plate (3), and is inserted into the anti-rotation groove (311).

5. The electromechanical brake assembly according to claim 3, characterized in that: A stop structure is provided between the outer piston (7) and the inner piston (8); when the inner piston (8) drives the outer piston (7) away from the friction plate (3) to a set limit position, the stop structure limits the continued rotation of the inner piston (8).

6. The electromechanical brake assembly according to claim 5, characterized in that: The stop structure is provided on a stop platform (71) on the outer piston (7), and a stop block (81) on the inner piston (8); when the outer piston (7) reaches the limit position, the stop block (81) is blocked on the stop platform (71), thereby limiting the continued rotation of the inner piston (8).

7. The electromechanical brake assembly according to claim 1, characterized in that: It also includes a parking mechanism disposed between the caliper body (1) and the gear transmission mechanism (20); The parking mechanism is located on a side of a gear in the gear transmission mechanism (20) facing the friction plate (3), and comprises a parking groove (2021) provided on the gear, and a parking push rod (191) movably provided on the caliper body (1); When the gear transmission mechanism (20) drives the driving piston to push the friction plate (3) to complete braking, the parking push rod (191) can be controlled to be inserted into the parking slot (2021) to keep the driving piston at the current position.

8. The electromechanical brake assembly according to any one of claims 1 to 7, characterized in that: It also comprises a force sensor (12) arranged between the driving piston and the caliper body (1); the force sensor (12) is used to detect the braking force applied by the driving piston to the friction plate (3).

9. The electromechanical brake assembly according to claim 8, characterized in that: The force sensor (12) is a button-type force sensor; the force sensor (12) is fixed to the caliper body (1) via a sensor flange (122), and a thrust needle roller bearing (11) is provided between the drive piston and the force sensor (12).

10. A vehicle, characterized in that: The vehicle adopts the electromechanical brake assembly according to any one of claims 1 to 9.

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