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EP-4741237-A1 - ELECTRONIC MECHANICAL BRAKING CALIPER, BRAKING SYSTEM AND VEHICLE

EP4741237A1EP 4741237 A1EP4741237 A1EP 4741237A1EP-4741237-A1

Abstract

The present invention provides an electronic mechanical braking caliper, a braking system and a vehicle. The electronic mechanical braking caliper includes a caliper body (1); a brake pad , and a driving module (3), where the driving module includes one driving portion (31), a transmission mechanism (32), a first speed reduction mechanism (33), a second speed reduction mechanism (34), a first piston assembly and a second piston assembly; the driving portion is in transmission connection with the first speed reduction mechanism and the second speed reduction mechanism through the transmission mechanism, the first speed reduction mechanism is in transmission connection with the first piston assembly, and the second speed reduction mechanism is in transmission connection with the second piston assembly; and the first piston assembly and the second piston assembly move in a first direction (A) to abut against the brake pad and drive the brake pad to move.

Inventors

  • YANG, LEI
  • YANG, DEQIANG
  • XU, JIE
  • LI, WEIWEI

Assignees

  • Xiaomi EV Technology Co., Ltd.

Dates

Publication Date
20260513
Application Date
20251030

Claims (15)

  1. An electronic mechanical braking caliper, comprising: a caliper body (1); a brake pad (2) arranged on the caliper body (1); and a driving module (3) arranged on the caliper body (1), wherein the driving module (3) comprises one driving portion (31), a transmission mechanism (32), a first speed reduction mechanism (33), a second speed reduction mechanism (34), a first piston assembly (36) and a second piston assembly (37); the driving portion (31) is in transmission connection with the first speed reduction mechanism (33) and the second speed reduction mechanism (34) through the transmission mechanism (32), the first speed reduction mechanism (33) is in transmission connection with the first piston assembly (36), and the second speed reduction mechanism (34) is in transmission connection with the second piston assembly (37); and the first piston assembly (36) and the second piston assembly (37) move in a first direction (A) to abut against the brake pad (2) and drive the brake pad (2) to move.
  2. The electronic mechanical braking caliper according to claim 1, wherein the driving module (3) further comprises a synchronization mechanism (35), and the synchronization mechanism (35) is arranged between the first speed reduction mechanism (33) and the second speed reduction mechanism (34) in a transmitting manner.
  3. The electronic mechanical braking caliper according to claim 1 or claim 2, wherein the transmission mechanism (32) comprises a first input gear (321), a first intermediate gear (322) and a second intermediate gear (323), the first input gear (321) is in transmission connection with the driving portion (31), and the first intermediate gear (322) and the second intermediate gear (323) are in transmission connection with the first input gear (321); and the first intermediate gear (322) is in transmission connection with the first speed reduction mechanism (33), and the second intermediate gear (323) is in transmission connection with the second speed reduction mechanism (34).
  4. The electronic mechanical braking caliper according to claim 3, wherein the first speed reduction mechanism (33) comprises a first output gear (331) and a first planetary gear assembly (332) which are in transmission connection with each other, the first output gear (331) is in transmission connection with the first intermediate gear (322), and the planetary gear assembly (332) is in transmission connection with the first piston assembly (36); and/or the second speed reduction mechanism (34) comprises a second output gear (341) and a second planetary gear assembly (342) which are in transmission connection with each other, the second output gear (341) is in transmission connection with the second intermediate gear (323), and the second planetary gear assembly (342) is in transmission connection with the second piston assembly (37).
  5. The electronic mechanical braking caliper according to claim 4, wherein the first output gear (331) and the second output gear (341) have a diameter of a first size, and the first intermediate gear (322) and the second intermediate gear (323) have a diameter of a second size; wherein the first size is greater than the second size.
  6. The electronic mechanical braking caliper according to claim 4 or claim 5, wherein the first planetary gear assembly (332) and/or the second planetary gear assembly (342) comprise/comprises a sun gear (101), a planetary gear (102), a ring gear (103) and a planetary carrier (104); and the sun gear (101) is in transmission connection with the first output gear (331) or the second output gear (341), the planetary gear (102) is arranged on the planetary carrier (104) and is in transmission connection with the sun gear (101), the ring gear (103) is fixedly arranged and meshes with the planetary gear (102), and the planetary carrier (104) is in transmission connection with the first piston assembly (36) or the second piston assembly (37); optionally, wherein the planetary carrier (104) is configured as a disk plate, and the disk plate is rotatably arranged in the ring gear (103); the disk plate comprises a disk plate body (1041) and a planetary gear shaft (1042), the planetary gear shaft (1042) is arranged on the disk plate body (1041), and the planetary gear (102) rotatably sleeves the planetary gear shaft (1042); and a gear hole (1043) is in a center of the disk plate, and the gear hole (1043) is in transmission connection with the first piston assembly (36) or the second piston assembly (37).
  7. The electronic mechanical braking caliper according to any one of claims 1-6, wherein the caliper body (1) is provided with a first beam body (11) and a second beam body (12), the first beam body (11) and the second beam body (12) extend in the first direction (A) and are spaced in a second direction (B), an accommodating recess (13) is provided between the first beam body (11) and the second beam body (12), and the driving portion (31) is arranged in the accommodating recess (13); a first piston cavity (110) penetrated through in the first direction (A) is provided inside the first beam body (11), the first piston assembly (36) is arranged in the first piston cavity (110), a second piston cavity (120) penetrated through in the first direction (A) is provided inside the second beam body (12), and the second piston assembly (37) is arranged in the second piston cavity (120); and wherein the first direction (A) intersects with the second direction (B); optionally, wherein the caliper body (1) is further provided with a first hollow groove (14) and a second hollow groove (15); the first hollow groove (14) is on one side of the first beam body (11) farther away from the accommodating recess (13) in the second direction (B), and the second hollow groove (15) is on one side of the second beam body (12) farther away from the accommodating recess (13) in the second direction (B); and wherein the first beam body (11) and the second beam body (12) are symmetrically arranged in the second direction (B), and the first hollow groove (14) and the second hollow groove (15) are symmetrically arranged in the second direction (B).
  8. The electronic mechanical braking caliper according to any one of claims 1-7, wherein the first piston assembly (36) and/or the second piston assembly (37) comprise/comprises a lead screw nut assembly, and the lead screw nut assembly comprises a drive screw (201) and a drive nut (202); the drive screw (201) extends in the first direction (A) and is in transmission connection with the first speed reduction mechanism (33) or the second speed reduction mechanism (34), and the drive screw (201) is axially locked and is circumferentially rotatable; and the drive nut (202) is circumferentially locked and axially and movably sleeves the drive screw (201), and the drive nut (202) is used to abut against the brake pad (2) and drive the brake pad (2) to move.
  9. The electronic mechanical braking caliper according to claim 8, wherein the lead screw nut assembly further comprises a piston sleeve (203), the piston sleeve (203) is connected to the drive nut (202), and the piston sleeve (203) is used to abut against the brake pad (2); and wherein the piston sleeve (203) and the drive nut (202) are integrally formed; or the piston sleeve (203) sleeves the drive nut (202), a first spherical surface is on an end surface of the drive nut (202), a second spherical surface is on an inner wall of the piston sleeve (203), and the first spherical surface is in spherical fit with the second spherical surface; or the piston sleeve (203) is on one side of the drive nut (202) in the first direction (A), and the piston sleeve (203) is connected to the drive nut (202) through a spherical hinge; optionally, wherein the drive screw (201) comprises a smooth rod section (2011), a stop flange (2012), a screw section (2013) and a connecting gear (2014); the smooth rod section (2011) and the screw section (2013) extend in the first direction (A), and the stop flange (2012) is connected between the smooth rod section (2011) and the screw section (2013); the drive nut (202) sleeves the screw section (2013), and is used to abut against the stop flange (2012); and the connecting gear (2014) is connected to one end of the smooth rod section (2011) farther away from the stop flange (2012), and is used for transmission connection with the first speed reduction mechanism (33) or the second speed reduction mechanism (34).
  10. The electronic mechanical braking caliper according to any one of claims 1-9, wherein the driving module (3) further comprises an adapter plate (38); the adapter plate (38) is arranged between the brake pad (2) and the first piston assembly (36) and the second piston assembly (37); and wherein an area in which the adapter plate (38) abuts against the brake pad (2) is a first area, a total area in which the first piston assembly (36) and the second piston assembly (37) abut against the adapter plate (38) is a second area, and the first area is greater than the second area.
  11. The electronic mechanical braking caliper according to claim 10, wherein the adapter plate (38) comprises a first side surface (381) and a second side surface (382) facing away from each other in the first direction (A), a first recess (3811) and a second recess (3812) are on the first side surface (381) in a recessed manner, the first recess (3811) is used to allow the first piston assembly (36) to be inserted, and the second recess (3812) is used to allow the second piston assembly (37) to be inserted; and wherein the first side surface (381) is fixedly connected to the first piston assembly (36) and/or the second piston assembly (37), or the second side surface (382) is fixedly connected to the brake pad (2).
  12. The electronic mechanical braking caliper according to claim 11, wherein a first plane (100) is at an end portion of a piston sleeve (203) of the first piston assembly (36) and/or the second piston assembly (37), a second plane (200) is on an inner wall of the first recess (3811) and/or the second recess (3812), and the first plane (100) is used to abut against the second plane (200); or wherein a first cambered surface (300) is at an end portion of a piston sleeve (203) of the first piston assembly (36) and/or the second piston assembly (37), a second cambered surface (400) is formed on an inner wall of the first recess (3811) and/or the second recess (3812), and the first cambered surface (300) is used to abut against the second cambered surface (400).
  13. The electronic mechanical braking caliper according to any one of claims 1-12, wherein the driving module (3) further comprises a module housing (39), the module housing (39) is detachably arranged on the caliper body (1), and the transmission mechanism (32), the first speed reduction mechanism (33) and the second speed reduction mechanism (34) are arranged in the module housing (39); optionally, wherein a first piston cavity (110) penetrated through in the first direction (A) is provided inside the caliper body (1), and the first piston assembly (36) is arranged in the first piston cavity (110); a second piston cavity (120) penetrated through in the first direction (A) is provided inside the caliper body (1), and the second piston assembly (37) is arranged in the second piston cavity (120); an accommodating recess (13) is provided in the caliper body (1) in a recessed manner, and the driving portion (31) is arranged in the accommodating recess (13); and a first opening (391), a second opening (392) and a third opening (393) are in the module housing, the first opening (391) is provided opposite the accommodating recess (13) in the first direction (A), the second opening (392) is provided opposite the first piston cavity (110) in the first direction (A), and the third opening (393) is provided opposite the second piston cavity (120) in the first direction (A).
  14. A braking system, comprising: the electronic mechanical braking caliper according to any one of claims 1-13.
  15. A vehicle, comprising: the electronic mechanical braking caliper according to any one of claims 1-13 or the braking system according to claim 14.

Description

TECHNICAL FIELD The present invention relates to the technical field of braking, and in particular to an electronic mechanical braking caliper, a braking system and a vehicle. BACKGROUND OF THE INVENTION A braking system of a vehicle is used to forcibly brake wheels to some extent by applying a braking force to the wheels. A braking control system functions to forcibly decelerate or even stop a traveling vehicle according to the requirements of a driver or a controller, or to stably park a stopped vehicle under various road conditions (for example, on a ramp), or to maintain speed stability of a vehicle traveling downhill. Hydraulic braking is typically used in a traditional braking system, and a hydraulic system is costly with complex layout, slow response, low energy efficiency and high redundancy. In view of that, an electronic mechanical braking (EMB) system has emerged. It has a variety of characteristics including simple layout and rapid response, and can better satisfy the requirements of rapid development of automotive technology, especially the requirement of electrical automation development of automobiles. However, a braking caliper of the EMB system typically has the problem of an insufficient braking capability in the related art. SUMMARY OF THE INVENTION The present invention provides an electronic mechanical braking caliper, a braking system and a vehicle, so as to overcome defects in the related art. A first aspect of the present invention provides an electronic mechanical braking caliper. The electronic mechanical braking caliper includes: a caliper body;a brake pad arranged on the caliper body; anda driving module arranged on the caliper body, the driving module includes one driving portion, a transmission mechanism, a first speed reduction mechanism, a second speed reduction mechanism, a first piston assembly and a second piston assembly;the driving portion is in transmission connection with the first speed reduction mechanism and the second speed reduction mechanism through the transmission mechanism, the first speed reduction mechanism is in transmission connection with the first piston assembly, and the second speed reduction mechanism is in transmission connection with the second piston assembly; andthe first piston assembly and the second piston assembly move in a first direction to abut against the brake pad and drive the brake pad to move. Optionally, the driving module further includes a synchronization mechanism, and the synchronization mechanism is arranged between the first speed reduction mechanism and the second speed reduction mechanism in a transmitting manner. Optionally, the transmission mechanism includes a first input gear, a first intermediate gear and a second intermediate gear, the first input gear is in transmission connection with the driving portion, and the first intermediate gear and the second intermediate gear are in transmission connection with the first input gear; andthe first intermediate gear is in transmission connection with the first speed reduction mechanism, and the second intermediate gear is in transmission connection with the second speed reduction mechanism. Optionally, the first speed reduction mechanism includes a first output gear and a first planetary gear assembly which are in transmission connection with each other, the first output gear is in transmission connection with the first intermediate gear, and the planetary gear assembly is in transmission connection with the first piston assembly; and/or the second speed reduction mechanism includes a second output gear and a second planetary gear assembly which are in transmission connection with each other, the second output gear is in transmission connection with the second intermediate gear, and the second planetary gear assembly is in transmission connection with the second piston assembly. Optionally, the first output gear and the second output gear have a diameter of a first size, and the first intermediate gear and the second intermediate gear have a diameter of a second size; the first size is greater than the second size. Optionally, the first planetary gear assembly and/or the second planetary gear assembly include/includes a sun gear, a planetary gear, a ring gear and a planetary carrier; and the sun gear is in transmission connection with the first output gear or the second output gear, the planetary gear is arranged on the planetary carrier and is in transmission connection with the sun gear, the ring gear is fixedly arranged and meshes with the planetary gear, and the planetary carrier is in transmission connection with the first piston assembly or the second piston assembly. Optionally, the planetary carrier is configured as a disk plate, and the disk plate is rotatably arranged in the ring gear; the disk plate includes a disk plate body and a planetary gear shaft, the planetary gear shaft is arranged on the disk plate body, and the planetary gear rotatably sleeves the planetary