A distributed electromechanical brake actuator based on a double-roller cylindrical cam

Abstract

The application provides a distributed electronic mechanical brake actuator based on a double-roller cylindrical cam, which mainly comprises a rotary motor, a universal transmission device, a cylindrical cam device, a lever force amplification mechanism and the like; the rotary motor is arranged on a vehicle frame, and motor power is transmitted to a mounting base through the universal transmission device; rotary motion is transmitted to the cylindrical cam through a transmission shaft and a bevel gear; two grooves of the cylindrical cam are in contact with two roller curved surfaces to form force amplification; a lever is hinged to a connecting rod, the other end of the connecting rod is hinged to a rotating pin on a front brake caliper body, a lever push shaft is arranged in a moving shaft through hole on a rear brake caliper body, and a lever shaft passes through a lever shaft mounting through hole; the scheme reduces the size and appearance size of a traditional actuator, arranges the motor on a spring, greatly reduces the under-spring mass of an automobile, improves the driving smoothness of the automobile, the telescopic transmission shaft structure can eliminate the relative position change caused by wheel jumping, and improves the vehicle adaptability of the electronic mechanical brake actuator.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automobile braking, and particularly relates to a distributed electronic mechanical brake actuator based on a double-roller cylindrical cam. BACKGROUND

[0002] The development of automobile intelligence and electrification requires that the braking system has reliable braking safety and can realize active braking function, and more and more enterprises and colleges pay attention to it. As a new braking system, electronic mechanical braking is clean and environmentally friendly, has high braking efficiency, responds more quickly, cancels the complex hydraulic pipeline and execution mechanism, has simple structure, makes the whole vehicle chassis layout simpler and more flexible, and can significantly improve the braking performance of the whole vehicle. In addition to the advantages of improving the safety of automobile braking, it can also realize the decoupling of the braking energy recovery system of new energy vehicles and improve the energy utilization rate of the whole vehicle, as described in the document “Research on Decoupling Type Braking Energy Recovery System Based on EMB” (Yang Kun, Gao Song, Wang Jie, etc. Research on Decoupling Type Braking Energy Recovery System Based on EMB [J]. Automobile Engineering, 2016, 38(8): 1072-1079.). The electronic mechanical braking system (EMB) is sensitive in response, can accurately and independently control the braking force of each wheel, realizes accurate coupling of mechanical braking force and motor regenerative braking force under the premise of meeting the braking demand of the driver, and is also convenient for integration with the anti-lock braking system (ABS) and electronic stability system (ESP), saves installation space, and is more convenient for control.

[0003] After comparing the existing electronic mechanical braking actuator schemes, such as “Bidirectional Synchronous Force-increasing Type Electronic Mechanical Braking Actuator Based on Linear Motor” (Yang Kun, Chen Yu, Wang Jie, etc. Bidirectional Synchronous Force-increasing Type Electronic Mechanical Braking Actuator Based on Linear Motor [P]. ZL201910996685.2) and the like, the following problems are found: first, the motor and other components greatly increase the unsprung mass of the automobile, which is not conducive to improving the riding comfort of the automobile; second, a large installation space of the braking system is occupied, especially in the Y-axis direction of the vehicle coordinate system, which is prone to motion interference with other components. Therefore, the electronic mechanical braking actuator proposed in the application arranges the motor on the spring, greatly reduces the unsprung mass of the automobile, can improve the response speed of the suspension shock absorber, and improve the riding comfort of the automobile. The volume and appearance size of the traditional actuator are effectively reduced, especially the size of the actuator in the Y-axis direction of the vehicle coordinate system is effectively reduced, the adaptability of the electronic mechanical braking actuator to the vehicle is improved, the telescopic transmission shaft structure can eliminate the position change of the installation base caused by the wheel jumping, avoid the impact on the actuator under different road conditions, improve the reliability of the actuator, and has practical significance for improving the riding comfort and safety of the automobile, and plays a promoting role in the popularization and application of the electronic mechanical braking system. SUMMARY

[0004] The application provides a distributed electronic mechanical brake actuator based on a double-roller cylindrical cam, which is characterized by mainly comprising a motor, a universal transmission device, a mounting base, a cylindrical cam mechanism and a lever force amplification mechanism.

[0005] The motor (1) is a rotary motor, the motor shaft (48) is fixedly connected with the first universal joint input fork (2) through a spline, and the motor (1) is fixed on an automobile frame.

[0006] The first universal joint is composed of the first universal joint input fork (2), the first universal joint cross shaft (3) and the first universal joint output fork (4); the first universal joint cross shaft (3) is connected with the first universal joint input fork (2) and the first universal joint output fork (4) in a matched mode; and the first universal joint output fork (4) is fixedly connected with the upper end transmission shaft (55).

[0007] The telescopic transmission shaft body is in a cylindrical structure and is composed of the upper end transmission shaft (55) and the lower end transmission shaft (6); the two transmission shafts are fixedly connected through a telescopic spline (5); the upper end transmission shaft (55) is fixedly connected with the first universal joint output fork (4); and the lower end transmission shaft (6) is fixedly connected with the second universal joint input fork (30).

[0008] The second universal joint is composed of the second universal joint input fork (30), the second universal joint cross shaft (29) and the second universal joint output fork (28); the second universal joint cross shaft (29) is connected with the second universal joint input fork (30) and the second universal joint output fork (28) in a matched mode.

[0009] The mounting base comprises a first side plate (38), a top plate (32), a second side plate (16), a bottom plate (43), a rear plate (37) and a front plate (31), and all are in a cuboid structure.

[0010] Three bolt holes (35) and a gear shaft through hole (36) are arranged on the top end surface (A2) of the top plate; the three threaded holes are used for fixing bearing end covers (7) and the number thereof is not limited to three.

[0011] A first through hole (39), a second through hole (40) and a first cam shaft fixing hole (41) are arranged on the right end surface (B1) of the second side plate; the central axes of the first through hole (39), the second through hole (40) and the first cam shaft fixing hole (41) are perpendicular to the right end surface (B1) of the second side plate; the first cam shaft fixing hole (41) is connected with a first bearing (49) in a matched mode; and the inner diameter of the first bearing (49) is consistent with the diameter of a cylindrical cam fixed end (54).

[0012] The bearing end cover (7) has four through holes, three of which are bolt through holes (83) and one is a gear shaft through hole (84). The central axis of the bolt through hole (83) coincides with the central axis of the threaded hole (35). The bottom surface (G1) of the bearing end cover is coplanar with the upper end surface (A2) of the top plate. The inner end surface (G2) of the end cover is coplanar with the upper end surface of the third bearing (82).

[0013] The bolt (27) passes through the bolt through hole (83) on the end cover and cooperates with the threaded hole (35) on the top plate to fix the bearing end cover (7) and the top plate (32). The third bearing (82) is fixedly connected with the bearing end cover (7). The outer diameter of the gear shaft (8) is consistent with the inner diameter of the third bearing (82).

[0014] The gear shaft (8) is provided with a gear shaft spline (80), and the second universal joint output fork (28) is provided with a spline groove (81). The gear shaft (8) and the second universal joint output fork (28) are fixedly connected through the spline.

[0015] The first front brake caliper support column through slot (44) and the second front brake caliper support column through slot (45) are arranged on the left end surface of the top plate (32).

[0016] The second camshaft fixing hole (47) is arranged on the left end surface of the first side plate (38). The central axis of the second camshaft fixing hole (47) is perpendicular to the left end surface of the first side plate (38). The second camshaft fixing hole (47) is connected with the second bearing (57). The second bearing (57) is connected with the cylindrical cam input end (53).

[0017] The first moving slot (42) is arranged on the front end surface (E3) of the rear plate. The second moving slot (46) is arranged on the rear end surface of the front plate. The first moving slot (42) and the second moving slot (46) are respectively used for assembling the moving shaft (22).

[0018] The first cam roller (14) is slidably connected with the cylindrical cam first track (51). The second cam roller (13) is slidably connected with the cylindrical cam second track (52). The upper end surface (H1) of the first roller pin shaft is coplanar with and fixedly connected with the lower end surface (I1) of the rear brake caliper body. The upper end surface (H2) of the second roller pin shaft is coplanar with and fixedly connected with the lower end surface (I1) of the rear brake caliper body. The second bevel gear (11) is connected with the cylindrical cam input end (53).

[0019] The moving shaft through hole (50) is arranged on the rear brake caliper body. The diameter of the moving shaft through hole (50) is consistent with the outer diameter of the moving shaft (22). The moving shaft (22) is connected with the moving shaft through hole (50).

[0020] The lever force amplification mechanism includes a lever (23), a lever shaft (26), a lever connecting hole (62), and a connecting rod (25).

[0021] The lever (23) has three connection ends, which are the connecting rod connection end (67), the first lever push shaft connection end (63), and the second lever push shaft connection end (64). The lever (23) is a Y-shaped left-right symmetrical structure. The first lever push shaft connection end (63) and the second lever push shaft connection end (64) are located on the two sides of the left-right symmetrical plane and are mutually symmetrical. The distance between the inner side of the first lever push shaft connection end (63) and the inner side of the second lever push shaft connection end (64) is less than the distance between the outer end faces of the two ends of the moving shaft (22). The distance between the inner side of the first lever push shaft connection end (63) and the inner side of the second lever push shaft connection end (64) is greater than the distance between the two ends of the rear brake caliper body upper moving shaft through hole (50). The connecting rod connection end (67) is located on the left-right symmetrical plane of the lever (23). The connecting rod connection end (67) is sequentially provided with a lever connecting rod connection hole (62) and a lever shaft mounting hole (61) from top to bottom. The first lever push shaft connection end (63) is provided with a first lever push shaft mounting hole (65). The second lever push shaft connection end (64) is provided with a second lever push shaft mounting hole (66).

[0022] The first rear brake caliper body shaft (58) is connected with the first spring (15), the second rear brake caliper body shaft (59) is connected with the second spring (60), the first lever push shaft mounting hole (65) is connected with the moving shaft (22), the second lever push shaft mounting hole (66) is connected with the moving shaft (22), and the moving shaft (22) can move forward and backward along the first moving groove (42) and the second moving groove (46) on the mounting base.

[0023] The lever shaft (26) passes through the lever shaft mounting hole (61), and the lever (23) rotates around the lever shaft (26).

[0024] The connecting rod (25) has three connection ends, and the connecting rod (25) is a Y-shaped left-right symmetrical structure. The lever connecting rod connection end (74) is provided with a lever connecting rod connection groove (69). The connecting groove (69) is provided with a lever connecting rod connection shaft (68). The outer diameter of the lever connecting rod connection shaft (68) is equal to the diameter of the lever connecting rod connection hole (62).

[0025] The first front brake caliper body connection end (70) and the second front brake caliper body connection end (72) are located on the other side of the connecting rod (25). The first front brake caliper body connection end (70) is provided with a first connecting rod rotating pin mounting through hole (73). The second front brake caliper body connection end (72) is provided with a second connecting rod rotating pin mounting through hole (71).

[0026] The front brake caliper body (19) is a left-right symmetrical structure, and the front brake caliper body (19) is provided with a first front brake caliper body support (24) and a second front brake caliper body support (77), the first front brake caliper body support (24) is provided with a first connecting rod rotating pin (75), the second front brake caliper body support (77) is provided with a second connecting rod rotating pin (76), and the front end of the front brake caliper body (19) is provided with a first guide rail (78) and a second guide rail (79).

[0027] The first connecting rod rotating pin mounting through hole (73) is connected with the first connecting rod rotating pin (75) in a matched mode, the second connecting rod rotating pin mounting through hole (71) is connected with the second connecting rod rotating pin (76) in a matched mode, and the outer brake pad outer end face (K1) is coplanar with and fixedly connected with the first front brake caliper body front end face (J1) and the second front brake caliper body front end face (J2).

[0028] The first guide rail (78) is arranged in the first front brake caliper support column through groove (44), the shape and size of the first guide rail (78) are same as those of the first front brake caliper support column through groove (44), and the first guide rail (78) can only move forward and backward along the first front brake caliper support column through groove (44); the second guide rail (79) is arranged in the second front brake caliper support column through groove (45), the shape and size of the second guide rail (79) are same as those of the second front brake caliper support column through groove (45), and the second guide rail (79) can only move forward and backward along the second front brake caliper support column through groove (45); the first front brake caliper body support (24) and the second front brake caliper body support (77) are fixedly arranged on the top of the front brake caliper body (19), the first front brake caliper body support (24) is fixedly arranged above the first front brake caliper support column through groove (44) and is provided with a U-shaped groove in the middle, and the second front brake caliper body support (77) is fixedly arranged above the second front brake caliper support column through groove (45) and is provided with a U-shaped groove in the middle.

[0029] The first rear brake caliper body shaft (58) is connected with the second through hole (40) on the second side plate (16) in a matched mode, and the second rear brake caliper body shaft (59) is connected with the first through hole (39) on the second side plate (16) in a matched mode.

[0030] Compared with the traditional brake system scheme, all functions of the traditional brake can be realized, and active braking can be realized, the complex structure such as a vacuum booster and a hydraulic pipeline is abandoned, the motor braking torque is accurately adjustable, four-wheel independent braking can be realized, and a solution is provided for a traditional vehicle brake system, a decoupling type brake energy recovery system of a new energy vehicle and a brake system of an intelligent driving vehicle.

[0031] Compared with the existing electromechanical brake actuator: the scheme is a new structure form; the rotary motor is fixed on the vehicle frame, which greatly reduces the unsprung mass of the vehicle, can improve the response speed of the suspension damper, and improve the vehicle ride comfort; effectively reduce the volume and appearance size of the actuator, improve the vehicle adaptability of the electromechanical brake actuator, the telescopic transmission shaft structure can eliminate the relative position change caused by wheel jumping, promote the popularization and application of the electromechanical brake system, and has positive significance for the rapid development of the automobile to the new energy, full electronic control and intelligent direction. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a three-dimensional structure diagram of the whole structure of the electromechanical brake actuator after removing the front plate.

[0033] Figure 2 It is a three-dimensional structure explosion diagram of the double-cross axle type universal transmission device.

[0034] Figure 3 It is a three-dimensional diagram of the spline structure of the telescopic transmission shaft.

[0035] Figure 4 It is a three-dimensional structure explosion diagram of the mounting base.

[0036] Figure 5 It is a top view of the top plate.

[0037] Figure 6 It is a three-dimensional structure diagram of the bearing end cover.

[0038] Figure 7 It is a three-dimensional structure diagram of the gear shaft, bearing end cover, bolt and third bearing after overall assembly.

[0039] Figure 8 It is a three-dimensional structure explosion diagram of the gear shaft, bearing end cover, bolt and third bearing after overall assembly.

[0040] Figure 9 It is a three-dimensional structure diagram of the gear shaft and the first bevel gear after assembly.

[0041] Figure 10 It is a three-dimensional structure explosion diagram of the first bevel gear, gear shaft and second universal joint output fork after assembly.

[0042] Figure 11 It is a three-dimensional diagram of the mounting base after removing the back plate and the second side plate.

[0043] Figure 12 It is a three-dimensional diagram of the internal structure of the mounting base after removing the top plate.

[0044] Figure 13 It is a three-dimensional structure diagram of the cylindrical cam, two rollers and two bearings after assembly.

[0045] Figure 14 Three-dimensional view of the rear caliper.

[0046] Figure 15 Three-dimensional view of the rear caliper body, spring, moving shaft and lever assembled.

[0047] Figure 16 Three-dimensional view of the lever.

[0048] Figure 17 Three-dimensional view of the connecting rod.

[0049] Figure 18 Three-dimensional view of the front caliper body.

[0050] Figure 19 Three-dimensional view of the front caliper body, outer brake pad and top plate assembled.

[0051] Figure 20 Three-dimensional exploded view of the rear caliper body, inner brake pad and second side plate assembled.

[0052] Figure 21 Three-dimensional view of the electromechanical brake actuator.

[0053] Figure 22 Three-dimensional view of the electromechanical brake actuator with the mounting base front plate removed.

[0054] In the figure: 1, motor; 2, first universal joint input fork; 3, first universal joint cross shaft; 4, first universal joint output fork; 5, telescopic spline; 6, lower end transmission shaft; 7, bearing end cover; 8, gear shaft; 9, rear brake caliper; 10, first bevel gear; 11, second bevel gear; 12, cylindrical cam rear end; 13, second cam roller; 14, first cam roller; 15, first spring; 16, second side plate; 17, brake disc; 18, outer brake pad; 19, front brake caliper body; 20, inner brake pad; 21, rear brake caliper body shaft; 22, moving shaft; 23, lever; 24, first front brake caliper body support; 25, connecting rod; 26, lever shaft; 27, bolt; 28, second universal joint output fork; 29, second universal joint cross shaft; 30, second universal joint input fork; 31, front plate; 32, top plate; 33, lever shaft through hole; 34, lever shaft; 35, threaded hole; 36, gear shaft through hole; 37, rear plate; 38, first side plate; 39, first through hole; 40, second through hole; 41, first cam shaft fixing hole; 42, first moving groove; 43, bottom plate; 44, first front brake caliper support column through groove; 45, second front brake caliper support column through groove; 46, second moving groove; 47, second cam shaft fixing hole; 48, motor shaft; 49, first bearing; 50, moving shaft through hole; 51, cylindrical cam first track; 52, cylindrical cam second track; 53, cylindrical cam input end; 54, cylindrical cam fixed end; 55, upper end transmission shaft; 56, transmission shaft key groove; 57, second bearing; 58, first rear brake caliper body shaft; 59, second rear brake caliper body shaft; 60, second spring; 61, lever shaft mounting hole; 62, lever connecting rod connecting hole; 63, first lever push shaft connecting end; 64, second lever push shaft connecting end; 65, first lever push shaft mounting hole; 66, second lever push shaft mounting hole; 67, connecting rod connecting end; 68, lever connecting rod connecting shaft; 69, lever connecting rod connecting groove; 70, first front brake caliper body connecting end; 71, second connecting rod rotating pin mounting through hole; 72, second front brake caliper body connecting end; 73, first connecting rod rotating pin mounting through hole; 74, lever connecting rod connecting end; 75, first connecting rod rotating pin; 76, second connecting rod rotating pin; 77, second front brake caliper body support; 78, first guide rail; 79, second guide rail; 80, gear shaft spline; 81, spline groove; 82, third bearing; 83, bolt through hole; 84, gear shaft through hole.

[0055] The meanings of the various end faces in the figure are as follows:

[0056] Figure 4In the middle: A1, top plate right end surface; A2, top plate upper end surface; A3, top plate front end surface; B1, second side plate right end surface; B2, second side plate upper end surface; B3, second side plate front end surface; C1, front plate right end surface; C2, front plate lower end surface; C3, front plate upper end surface; C4, front plate front end surface; D1, first side plate upper end surface; D2, first side plate right end surface; D3, first side plate front end surface; E1, rear plate upper end surface; E2, rear plate right end surface; E3, rear plate front end surface; F1, bottom plate right end surface; F2, bottom plate upper end surface; F3, bottom plate front end surface.

[0057] Figure 6 In the middle: G1, bearing end cover bottom surface; G2, end cover inner end surface.

[0058] Figure 13 In the middle: H1, first roller pin shaft upper end surface; H2, second roller pin shaft upper end surface.

[0059] Figures 14-15 In the middle: I1, rear brake caliper body lower end surface; I2, first rear brake caliper body front end surface; I3, second rear brake caliper body front end surface; I4, first rear brake caliper body rear end surface; I5, second rear brake caliper body rear end surface.

[0060] Figure 18 In the middle: J1, first front brake caliper body front end surface; J2, second front brake caliper body front end surface.

[0061] Figures 19-20 In the middle: K1, outer brake pad outer end surface; K2, inner brake pad inner end surface. DETAILED DESCRIPTION

[0062] The application provides a kind of distributed electronic mechanical brake actuator based on double-roller cylindrical cam, to make the technical scheme and effect of the application more clear, definite, with example further detailed description of the application is described with reference to the drawings;It should be understood that the specific implementation described here is only used to explain the application, and is not used to limit the application.

[0063] A kind of distributed electronic mechanical brake actuator based on double-roller cylindrical cam is mainly composed of motor, universal transmission device, installation matrix, cylindrical cam mechanism, lever force increasing mechanism.

[0064] As shown in Figure 1 The motor (1) is a rotary motor, and the motor shaft (48) is fixedly connected with the first universal joint input fork (2) through a spline, and the motor (1) is fixed on the automobile frame.

[0065] As shown in Figures 2-3As shown, the first universal joint is composed of a first universal joint input fork (2), a first universal joint cross shaft (3), and a first universal joint output fork (4); the first universal joint cross shaft (3) is connected with the first universal joint input fork (2) and the first universal joint output fork (4); and the first universal joint output fork (4) is fixedly connected with the upper end transmission shaft (55).

[0066] The telescopic transmission shaft body is a cylindrical structure, composed of an upper end transmission shaft (55) and a lower end transmission shaft (6), and the two transmission shafts are fixedly connected by a telescopic spline (5); the upper end transmission shaft (55) is fixedly connected with the first universal joint output fork (4); and the lower end transmission shaft (6) is fixedly connected with the second universal joint input fork (30).

[0067] The second universal joint is composed of a second universal joint input fork (30), a second universal joint cross shaft (29), and a second universal joint output fork (28); the second universal joint cross shaft (29) is connected with the second universal joint input fork (30) and the second universal joint output fork (28).

[0068] As shown in Figures 4-5 the mounting base body includes a first side plate (38), a top plate (32), a second side plate (16), a bottom plate (43), a rear plate (37), and a front plate (31), and all are cuboid structures.

[0069] The left end face of the bottom plate (43) is coplanar with the left end face of the second side plate (16), and the upper end face (F2) of the bottom plate is coplanar with and fixedly connected with the lower end face of the second side plate (16).

[0070] The front end face (F3) of the bottom plate is coplanar with and fixedly connected with the rear end face of the front plate, and the lower end face of the bottom plate is coplanar with the lower end face of the front plate (31).

[0071] The lower end face of the bottom plate is coplanar with the lower end face of the rear plate (37), and the rear end face of the bottom plate (43) is coplanar with and fixedly connected with the front end face of the rear plate (37).

[0072] The right end face (F1) of the bottom plate is coplanar with the right end face (D2) of the first side plate, and the upper end face (F2) of the bottom plate is coplanar with and fixedly connected with the lower end face of the first side plate (38).

[0073] The left end face (C5) of the front plate is coplanar with the left end face of the second side plate (16), and the front end face (B3) of the second side plate is coplanar with and fixedly connected with the rear end face of the front plate (31).

[0074] The left end face of the rear plate (37) is coplanar with the left end face of the second side plate (16), and the rear end face of the second side plate (16) is coplanar with and fixedly connected with the front end face (E3) of the rear plate.

[0075] The front end surface of the top plate (A3) is coplanar with the rear end surface of the front plate and is fixedly connected, the upper end surface of the top plate (32) is coplanar with the upper end surface of the front plate (C3); the left end surface of the top plate (32) is coplanar with the left end surface of the second side plate (16), and the lower end surface of the top plate (32) is coplanar with the upper end surface of the second side plate (B2) and is fixedly connected; the rear end surface of the top plate (32) is coplanar with the front end surface of the rear plate (37) and is fixedly connected, and the upper end surface of the top plate (32) (A2) is coplanar with the upper end surface of the rear plate (E1); the right end surface of the second side plate (B1), the front end surface of the front plate (C4), and the front end surface of the rear plate (E3) are all perpendicular to the upper end surface of the top plate (A2).

[0076] The front end surface of the first side plate (D3) is coplanar with the front end surface of the bottom plate (F3), the front end surface of the second side plate (B3), and the front end surface of the top plate (A3); the rear end surface of the first side plate (38) is coplanar with the rear end surface of the bottom plate (43), the rear end surface of the second side plate (16), and the rear end surface of the top plate (32); the front end surface of the first side plate (38) is coplanar with the rear end surface of the front plate and is fixedly connected; the rear end surface of the first side plate (38) is coplanar with the front end surface of the rear plate (E3) and is fixedly connected; and the upper end surface of the first side plate (D1) is coplanar with the lower end surface of the top plate (32) and is fixedly connected.

[0077] The upper end surface of the top plate (A2) is provided with three bolt holes (35) and a gear shaft through hole (36), and the three threaded holes are used for fixing the bearing end cover (7), and the number is not limited to 3.

[0078] As shown in Figure 4 , 13 , the right end surface of the second side plate (B1) is provided with a first through hole (39), a second through hole (40), and a first camshaft fixing hole (41), the center axes of the first through hole (39), the second through hole (40), and the first camshaft fixing hole (41) are perpendicular to the right end surface of the second side plate (B1), the first camshaft fixing hole (41) is connected with the first bearing (49) in a matched mode, and the inner diameter of the first bearing is consistent with the diameter of the cylindrical cam fixed end (54).

[0079] As shown in Figure 6 , 8 , the bearing end cover (7) has four through holes, three of which are bolt through holes (83) and one is a gear shaft through hole (84), the center axis of the bolt through hole (83) coincides with the center axis of the threaded hole (35), the bottom surface of the bearing end cover (G1) is coplanar with the upper end surface of the top plate (A2), and the inner end surface of the end cover (G2) is coplanar with the upper end surface of the third bearing (82).

[0080] As shown in Figures 7-8As shown, the bolt (27) passes through the bolt through hole (83) on the end cover and cooperates with the threaded hole (35) on the top plate to fix the bearing end cover (7) and the top plate (32); the third bearing (82) is fixedly connected with the bearing end cover (7), and the outer diameter of the gear shaft (8) is consistent with the inner diameter of the third bearing (82).

[0081] As shown in the drawings, Figures 9-10 As shown, the gear shaft (8) is provided with a gear shaft spline (80), and the second universal joint output fork (28) is provided with a spline groove (81), and the gear shaft (8) and the second universal joint output fork (28) are fixedly connected through the spline.

[0082] As shown in the drawings, Figures 11-13 As shown, the first front brake caliper support column through slot (44) and the second front brake caliper support column through slot (45) are arranged on the left end surface of the top plate (32). The second camshaft fixing hole (47) is arranged on the left end surface of the first side plate (38), and the central axis of the second camshaft fixing hole (47) is perpendicular to the left end surface of the first side plate. The second camshaft fixing hole (47) is connected with the second bearing (57), and the second bearing (57) is connected with the cylindrical cam input end (53).

[0083] As shown in the drawings, Figure 11 , 12 As shown, the first moving slot (42) is arranged on the front end surface (E3) of the rear plate, and the second moving slot (46) is arranged on the rear end surface of the front plate, which are respectively used for assembling the moving shaft (22).

[0084] As shown in the drawings, Figures 13-14 As shown, the first cam roller (14) is slidably connected with the cylindrical cam first track (51), the second cam roller (13) is slidably connected with the cylindrical cam second track (52), the upper end surface (H1) of the first roller pin shaft is coplanar with and fixedly connected with the lower end surface (I1) of the rear brake caliper body, the upper end surface (H2) of the second roller pin shaft is coplanar with and fixedly connected with the lower end surface (I1) of the rear brake caliper body, and the second bevel gear (11) is connected with the cylindrical cam input end (53). The moving shaft through hole (50) is arranged on the rear brake caliper body, the diameter of the moving shaft through hole (50) is consistent with the outer diameter of the moving shaft (22), and the moving shaft (22) is connected with the moving shaft through hole (50).

[0085] As shown in the drawings, Figure 1 , 15As shown in Figure 16, the lever amplification mechanism includes a lever (23), a lever shaft (26), a lever connecting rod connecting hole (62), and a connecting rod (25). The lever (23) has three connecting ends: a connecting rod connecting end (67), a first lever push shaft connecting end (63), and a second lever push shaft connecting end (64). The lever (23) has a Y-shaped left-right symmetrical structure. The first lever push shaft connecting end (63) and the second lever push shaft connecting end (64) are located on opposite sides of the left-right symmetrical plane and are symmetrical to each other. The distance between the inner side of the first lever push shaft connecting end (63) and the inner side of the second lever push shaft connecting end (64) is less than the distance between the outer end faces of the two ends of the moving shaft (22). The distance between the inner side of the connecting end (63) and the inner side of the second lever push shaft connecting end (64) is greater than the distance between the two ends of the moving shaft through hole (50) on the rear brake caliper body; the connecting rod connecting end (67) is located on the left and right symmetrical plane of the lever (23); the connecting rod connecting end (67) is provided with lever connecting rod connecting hole (62) and lever shaft mounting hole (61) from top to bottom; the first lever push shaft connecting end (63) is provided with first lever push shaft mounting hole (65); the second lever push shaft connecting end (64) is provided with second lever push shaft mounting hole (66).

[0086] The first rear brake caliper shaft (58) is connected to the first spring (15), the second rear brake caliper shaft (59) is connected to the second spring (60), the first lever push shaft mounting hole (65) is connected to the moving shaft (22), the second lever push shaft mounting hole (66) is connected to the moving shaft (22), and the moving shaft (22) can move back and forth along the first moving groove (42) and the second moving groove (46) on the mounting base.

[0087] like Figure 1 , 16 As shown in ~17, the lever shaft (26) passes through the lever shaft mounting hole (61), and the lever (23) rotates around the lever shaft (26).

[0088] like Figure 17 As shown, the connecting rod (25) has three connecting ends. The connecting rod (25) has a Y-shaped left-right symmetrical structure. The lever connecting rod connecting end (74) is provided with a lever connecting rod connecting groove (69). The connecting groove (69) is provided with a lever connecting rod connecting shaft (68). The outer diameter of the lever connecting rod connecting shaft (68) is equal to the diameter of the lever connecting rod connecting hole (62). The first front brake caliper connecting end (70) and the second front brake caliper connecting end (72) are located on the other side of the connecting rod (25). The first front brake caliper connecting end (70) is provided with a first connecting rod rotating pin mounting through hole (73), and the second front brake caliper connecting end (72) is provided with a second connecting rod rotating pin mounting through hole (71).

[0089] like Figure 18As shown, the front brake caliper body (19) is a left-right symmetrical structure, the front brake caliper body (19) is provided with a first front brake caliper body support (24) and a second front brake caliper body support (77), the first front brake caliper body support (24) is provided with a first connecting rod rotating pin (75), the second front brake caliper body support (77) is provided with a second connecting rod rotating pin (76), and the front end of the front brake caliper body (19) is provided with a first guide rail (78) and a second guide rail (79).

[0090] As shown in Figure 11 , 17 As shown in

[0091] The first guide rail (78) is arranged in the first front brake caliper support column through groove (44), the shape and size of the first guide rail (78) are the same as those of the first front brake caliper support column through groove (44), and the first guide rail (78) can only move forward and backward along the first front brake caliper support column through groove (44); the second guide rail (79) is arranged in the second front brake caliper support column through groove (45), the shape and size of the second guide rail (79) are the same as those of the second front brake caliper support column through groove (45), and the second guide rail (79) can only move forward and backward along the second front brake caliper support column through groove (45); the first front brake caliper body support (24) and the second front brake caliper body support (77) are fixedly installed on the top of the front brake caliper body (19), the first front brake caliper body support (24) is fixedly installed above the first front brake caliper support column through groove (44) and is provided with a U-shaped groove in the middle, and the second front brake caliper body support (77) is fixedly installed above the second front brake caliper support column through groove (45) and is provided with a U-shaped groove in the middle.

[0092] As shown in Figures 14-15 , 20, the first rear brake caliper body shaft (58) is connected with the second through hole (40) on the second side plate (16), the second rear brake caliper body shaft (59) is connected with the first through hole (39) on the second side plate (16), the first rear brake caliper body front end face (I2) and the second rear brake caliper body front end face (I3) are coplanar with and fixedly connected with the right end face (K2) of the inner brake pad (20), and the first rear brake caliper body rear end face (I4) and the second rear brake caliper body rear end face (I5) are coplanar with and fixedly connected with the left end face of the second side plate (16).

[0093] The working principle of the distributed electronic mechanical brake actuator based on the double-roller cylindrical cam is as follows.

[0094] The process of applying and adjusting the brake force size is as follows: when the driver steps on the brake pedal, the motor (1) is energized, the motor shaft (48) rotates and drives the first universal joint to rotate, the first universal joint output fork (4) drives the upper end transmission shaft (55) to make clockwise rotation; the upper end transmission shaft (55) transmits the rotary motion to the lower end transmission shaft (6) through the telescopic spline (5), thereby driving the second universal joint to transmit the rotary motion to the bevel gear set through the gear shaft (8), the second bevel gear (11) drives the cylindrical cam to rotate clockwise, and the size rollers on the cylindrical cam are supported and limited by the cylindrical cam track, thereby driving the rear brake caliper (9) to translate along the central axis of the second side plate through hole, and the rear brake caliper (9) drives the inner brake pad (20) to press against the brake disc (17); at the same time, the moving shaft (22) is driven to move forward along the first moving groove (42) and the second moving groove (46) when the rear brake caliper (9) moves forward, and the corresponding lever moves forward, at this time, the lever (23) can only rotate clockwise around the lever shaft (26), the lever (23) drives the connecting rod to translate right through the lever connecting rod connecting shaft (68), which makes the first connecting rod rotating pin mounting through hole (73) and the second connecting rod rotating pin mounting through hole (71) of the connecting rod (25) drive the first connecting rod rotating pin (75) and the second connecting rod rotating pin (76) to move to the motor (1) side while rotating around the first connecting rod rotating pin (75) and the second connecting rod rotating pin (76) respectively; the first connecting rod rotating pin (75) and the second connecting rod rotating pin (76) drive the front brake caliper body (19) to move, and the first guide rail (78) and the second guide rail (79) on the front brake caliper body (20) can only translate along the first front brake caliper support column through slot (44) and the second front brake caliper support column through slot (45) under the limiting action of the first front brake caliper support column through slot (44) and the second front brake caliper support column through slot (45), therefore, the front brake caliper body (19) is translated to the brake disc side under the driving of the first connecting rod rotating pin (75) and the second connecting rod rotating pin (76), thereby driving the outer brake pad (18) to press against the brake disc (17), and finally the brake disc is applied with brake force through the outer brake pad (18) and the inner brake pad (20).

[0095] In the process of applying the brake, the driver controls the motor (1) output motor torque through the brake pedal opening, so as to realize the adjustment of the brake force size; when the wheels run on different road surfaces and jump, the telescopic spline (5) of the transmission shaft can not only ensure power transmission, but also eliminate the relative position change of the installation base caused by wheel jumping.

[0096] The process of canceling the brake force is as follows: when the driver releases the brake pedal, the motor (1) is energized, the motor shaft (48) rotates counterclockwise, the motor shaft rotates and drives the first universal joint to rotate, the first universal joint output fork (4) drives the upper end transmission shaft (55) to rotate counterclockwise; the upper end transmission shaft (55) transmits the rotary motion to the lower end transmission shaft (6) through the telescopic spline (5), thereby driving the second universal joint to transmit the rotary motion to the bevel gear set through the gear shaft (8), the second bevel gear (11) drives the cylindrical cam to rotate counterclockwise, and the large and small rollers on the cylindrical cam are supported and limited by the cylindrical cam track, thereby driving the rear brake caliper (9) to translate along the center axis of the second side plate through hole, and the rear brake caliper (9) drives the inner brake pad (20) to move away from the brake disc (17); at the same time, the moving shaft (22) is driven to move backward along the first moving groove (42) and the second moving groove (46) when the rear brake caliper (9) moves backward, thereby driving the lever (23) to move backward, at this time, the lever (23) can only rotate counterclockwise around the lever shaft (26), and the lever (23) drives the connecting rod to translate through the lever connecting rod connecting shaft (68), which makes the first connecting rod rotating pin mounting through hole (71) and the second connecting rod rotating pin mounting through hole (73) of the connecting rod (25) drive the first connecting rod rotating pin (75) and the second connecting rod rotating pin (76) to move away from the motor (1) side while rotating around the first connecting rod rotating pin (75) and the second connecting rod rotating pin (76), respectively; the first connecting rod rotating pin (75) and the second connecting rod rotating pin (76) drive the front brake caliper body (19) to move leftward, and the first guide rail (78) and the second guide rail (79) on the front brake caliper body (20) can only translate along the first front brake caliper support column through groove (44) and the second front brake caliper support column through groove (45) under the limiting action of the first front brake caliper support column through groove (44) and the second front brake caliper support column through groove (45), therefore, the front brake caliper body (19) is translated away from the brake disc side under the driving of the first connecting rod rotating pin (75) and the second connecting rod rotating pin (76), thereby driving the outer brake pad (18) to separate from the brake disc (17). The inner brake pad (20) and the outer brake pad (18) separate from the brake disc (17), and finally the brake force is canceled.

Claims

1. A dual-roller cylindrical cam based distributed electromechanical brake actuator, characterized by: Mainly by motor, universal transmission device, installation base, cylindrical cam mechanism, lever force increasing mechanism composition; The motor (1) is a rotary motor, the motor shaft (48) is fixedly connected with the first universal joint input fork (2) through the spline, and the motor (1) is fixed on the automobile frame; The first universal joint is composed of the first universal joint input fork (2), the first universal joint cross shaft (3) and the first universal joint output fork (4); the first universal joint cross shaft (3) is connected with the first universal joint input fork (2) and the first universal joint output fork (4); the first universal joint output fork (4) is fixedly connected with the upper end transmission shaft (55); The telescopic transmission shaft body is a cylindrical structure, which is composed of the upper end transmission shaft (55) and the lower end transmission shaft (6), and the two transmission shafts are fixedly connected through the telescopic spline (5); the upper end transmission shaft (55) is fixedly connected with the first universal joint output fork (4); and the lower end transmission shaft (6) is fixedly connected with the second universal joint input fork (30); The second universal joint is composed of the second universal joint input fork (30), the second universal joint cross shaft (29) and the second universal joint output fork (28); the second universal joint cross shaft (29) is connected with the second universal joint input fork (30) and the second universal joint output fork (28); The installation base comprises a first side plate (38), a top plate (32), a second side plate (16), a bottom plate (43), a rear plate (37) and a front plate (31), and all are in the cuboid structure; Three threaded holes (35) and a gear shaft through hole are arranged on the upper end surface (A2) of the top plate, the three threaded holes are used for fixing the bearing end cover (7), and the number of the threaded holes is not limited to three; A first through hole (39), a second through hole (40) and a first cam shaft fixing hole (41) are arranged on the right end surface (B1) of the second side plate; the center axes of the first through hole (39), the second through hole (40) and the first cam shaft fixing hole (41) are perpendicular to the right end surface (B1) of the second side plate; the first cam shaft fixing hole (41) is connected with the first bearing (49); the inner diameter of the first bearing (49) is consistent with the diameter of the cylindrical cam fixed end (54); the bearing end cover (7) has four through holes, three bolt through holes (83) and a gear shaft through hole; the center axis of the bolt through hole (83) is coincident with the center axis of the threaded hole (35); the bottom surface (G1) of the bearing end cover is coplanar with the upper end surface (A2) of the top plate; the inner end surface (G2) of the end cover is coplanar with the upper end surface of the third bearing (82); The bolt (27) passes through the bolt through hole (83) on the end cover and is matched with the threaded hole (35) on the top plate, so as to fix the bearing end cover (7) and the top plate (32); the third bearing (82) is fixedly connected with the bearing end cover (7); the outer diameter of the gear shaft (8) is consistent with the inner diameter of the third bearing (82); The gear shaft (8) is provided with a gear shaft spline (80), and the second universal joint output fork (28) is provided with a spline groove (81); the gear shaft (8) is fixedly connected with the second universal joint output fork (28) through the spline; First and second front brake caliper support column through grooves (44) and (45) are arranged on the left end surface of the top plate (32). The left end face of the first side plate (38) is provided with a second camshaft fixing hole (47), the central axis of the second camshaft fixing hole (47) is perpendicular to the left end face of the first side plate (38), the second camshaft fixing hole (47) is connected with the second bearing (57) in a matched mode, and the second bearing (57) is connected with the cylindrical cam input end (53) in a matched mode; The front end face (E3) of the rear plate is provided with a first moving groove (42), and the rear end face of the front plate is provided with a second moving groove (46), which are respectively used for assembling the moving shaft (22); The first cam roller (14) is connected with the cylindrical cam first track (51) in a sliding mode, the second cam roller (13) is connected with the cylindrical cam second track (52) in a sliding mode, the upper end face (H1) of the first roller pin shaft is fixedly connected with the lower end face (I1) of the rear brake caliper body in a coplanar mode, the upper end face (H2) of the second roller pin shaft is fixedly connected with the lower end face (I1) of the rear brake caliper body in a coplanar mode, and the second bevel gear (11) is connected with the cylindrical cam input end (53) in a matched mode; The rear brake caliper body is provided with a moving shaft through hole (50), the diameter of the moving shaft through hole (50) is consistent with the outer diameter of the moving shaft (22), and the moving shaft (22) is connected with the moving shaft through hole (50) in a matched mode.

2. A dual-roller cylindrical cam based distributed electronic mechanical brake actuator according to claim 1, characterized in that: The lever force amplification mechanism comprises a lever (23), a lever shaft (26), a lever connecting hole (62) and a connecting rod (25); The lever (23) has three connecting ends, which are a connecting rod connecting end (67), a first lever push shaft connecting end (63) and a second lever push shaft connecting end (64), the lever (23) is a Y-shaped left-right symmetrical structure, the first lever push shaft connecting end (63) and the second lever push shaft connecting end (64) are located on the two sides of the left-right symmetrical plane and are symmetrical to each other, the distance between the inner side of the first lever push shaft connecting end (63) and the inner side of the second lever push shaft connecting end (64) is less than the distance between the outer end faces of the two ends of the moving shaft (22), the distance between the inner side of the first lever push shaft connecting end (63) and the inner side of the second lever push shaft connecting end (64) is greater than the distance between the two ends of the moving shaft through hole (50) on the rear brake caliper body, the connecting rod connecting end (67) is located on the left-right symmetrical plane of the lever (23), the connecting rod connecting end (67) is sequentially provided with the lever connecting hole (62) and the lever shaft mounting hole (61) from top to bottom, the first lever push shaft connecting end (63) is provided with a first lever push shaft mounting hole (65), and the second lever push shaft connecting end (64) is provided with a second lever push shaft mounting hole (66); The first rear brake caliper body shaft (58) is connected with the first spring (15) in a matched mode, the second rear brake caliper body shaft (59) is connected with the second spring (60) in a matched mode, the first lever push shaft mounting hole (65) is connected with the moving shaft (22) in a matched mode, the second lever push shaft mounting hole (66) is connected with the moving shaft (22) in a matched mode, and the moving shaft (22) can move forward and backward along the first moving groove (42) and the second moving groove (46) on the mounting base body; The lever shaft (26) passes through the lever shaft mounting hole (61), and the lever (23) rotates around the lever shaft (26). The connecting rod (25) has three connecting ends, the connecting rod (25) is Y-shaped and left-right symmetrical structure, the lever connecting rod connecting end (74) is provided with a lever connecting rod connecting groove (69), the connecting groove (69) is provided with a lever connecting rod connecting shaft (68), the outer diameter of the lever connecting rod connecting shaft (68) is equal to the diameter of the lever connecting rod connecting hole (62); The first front brake caliper body connecting end (70) and the second front brake caliper body connecting end (72) are located on the other side of the connecting rod (25), the first front brake caliper body connecting end (70) is provided with a first connecting rod rotating pin mounting through hole (73), and the second front brake caliper body connecting end (72) is provided with a second connecting rod rotating pin mounting through hole (71); The front brake caliper body (19) is left-right symmetrical structure, the front brake caliper body (19) is provided with a first front brake caliper body support (24) and a second front brake caliper body support (77), the first front brake caliper body support (24) is provided with a first connecting rod rotating pin (75), and the second front brake caliper body support (77) is provided with a second connecting rod rotating pin (76), the front end of the front brake caliper body (19) is provided with a first guide rail (78) and a second guide rail (79); The first connecting rod rotating pin mounting through hole (73) is connected with the first connecting rod rotating pin (75), the second connecting rod rotating pin mounting through hole (71) is connected with the second connecting rod rotating pin (76), the outer end face (K1) of the outer brake pad is coplanar with the first front brake caliper body front end face (J1) and the second front brake caliper body front end face (J2) and is fixedly connected; The first guide rail (78) is arranged in the first front brake caliper support column through groove (44), the shape and size of the first guide rail (78) are same as those of the first front brake caliper support column through groove (44), and the first guide rail (78) can only move forward and backward along the first front brake caliper support column through groove (44); The second guide rail (79) is arranged in the second front brake caliper support column through groove (45), the shape and size of the second guide rail (79) are same as those of the second front brake caliper support column through groove (45), and the second guide rail (79) can only move forward and backward along the second front brake caliper support column through groove (45); The first front brake caliper body support (24) and the second front brake caliper body support (77) are fixedly installed on the top of the front brake caliper body (19), the first front brake caliper body support (24) is fixedly installed above the first front brake caliper support column through groove (44), and the second front brake caliper body support (77) is fixedly installed above the second front brake caliper support column through groove (45) and is a U-shaped groove in the middle; The first rear brake caliper body shaft (58) is connected with the second through hole (40) on the second side plate (16), and the second rear brake caliper body shaft (59) is connected with the first through hole (39) on the second side plate (16).

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