A one-way distributed electromechanical brake actuator based on multi-link transmission

Abstract

The application provides a one-way distributed electronic mechanical brake actuator based on a multi-connecting rod transmission, which comprises a motor, a mounting base and a transmission force increasing mechanism; during braking, the motor is powered, a universal joint mounting shaft rotates, power is transmitted to a first connecting rod through the universal joint and an input shaft, the second connecting rod is driven to rotate, a rack is pushed to move along a piston axis, the first force increasing gear and the second force increasing gear are rotated, the third connecting rod and the fourth connecting rod push the piston to move, the first friction plate is pushed to the brake disc, the whole actuator moves to the motor side under the reaction of the positive pressure applied to the brake disc by the first friction plate, the second friction plate is pressed to the brake disc, and the brake disc is applied with a braking force; the size of the braking force can be adjusted by adjusting the torque of the motor, the motor is arranged on the vehicle body in the scheme, the unsprung mass can be effectively reduced, the problems of the traditional electronic actuator, such as large size and difficult arrangement, are solved, and a solution is provided for the active braking system.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automobile braking, and particularly relates to a one-way distributed electronic mechanical brake actuator based on multi-link transmission. BACKGROUND

[0002] At present, the concept of "new four modernizations" (electrification, intelligence, networking and sharing) of automobiles points out the direction for the future development of automobiles, gradually promotes the development of emerging technologies such as intelligent chassis and brake-by-wire of new energy vehicles, and the electronic mechanical brake system is favored by various vehicle manufacturers due to its unique advantages of high safety, high reliability, active control and fast response; as described in the document "Research on Electronic Mechanical Brake and Stability Control System of Light Vehicle" (Yang Kun. Research on Electronic Mechanical Brake and Stability Control System of Light Vehicle [D]. Changchun: Jilin University, 2009); the electronic mechanical brake realizes complete electric control, changes the braking idea, and the braking force generating component is placed on the wheel, which can generate braking force faster; the system has simple structure, light weight, small size, rapid braking response time, safety and reliability, and is easier to integrate ABS, TCS, ESP and other functions, and more rapidly promotes the development of current automobiles towards more concise and higher integration.

[0003] At present, electronic mechanical brake in China is still in the research stage, and how to effectively reduce the size and weight of the electronic mechanical brake actuator becomes the key to its popularization and application, for example, the electronic mechanical brake scheme such as "One-Way Double-Stage Force Amplification Type Electronic Mechanical Brake Actuator Based on Rotary Motor and Ball Screw" (Yang Kun, Wang Jie, Chen Yu, etc. One-Way Double-Stage Force Amplification Type Electronic Mechanical Brake Actuator Based on Rotary Motor and Ball Screw [P]. ZL201910996697.5) can be seen, the traditional electronic mechanical brake system arranges the motor under the spring, which causes problems such as large weight, large size, difficult arrangement and large under-spring mass of the traditional electronic mechanical brake; therefore, based on the previous research, the application proposes a new structure of electronic mechanical brake actuator, which transfers the motor of the electronic mechanical brake actuator to the vehicle body installation, compared with the traditional electronic mechanical brake actuator, the structure is more compact, effectively reduces the under-spring mass, improves the suspension response performance and improves the ride comfort, and solves the problems such as large weight and difficult arrangement of the traditional electronic mechanical brake; at the same time, under the premise of meeting the braking demand of the whole vehicle, the size of the under-spring electronic mechanical brake actuator can be effectively reduced, and the braking demand of large vehicles can be met. SUMMARY

[0004] The application provides a one-way distributed electronic mechanical brake actuator based on multi-link transmission, and the technical scheme is as follows:

[0005] A one-way distributed electronic mechanical brake actuator based on multi-link transmission is composed of a motor, a transmission force increasing mechanism and a mounting base.

[0006] The motor (27) is a rotary motor, the front part of the motor shaft (28) is a universal joint mounting shaft (30), the universal joint mounting shaft (30) is provided with a first key groove (29), the universal joint mounting shaft (30) has a smaller diameter than the motor shaft (28), and the first universal joint input fork (31) is connected with the universal joint mounting shaft (30) through the first key groove (29).

[0007] The transmission force increasing mechanism comprises a first universal joint input fork (31), a first universal joint cross shaft (32), a first universal joint output fork (33), an upper end transmission shaft (34), a lower end transmission shaft (35), a second universal joint input fork (36), a second universal joint cross shaft (37), a second universal joint output fork (38), an input shaft (1), a first connecting rod (3), a second connecting rod (4), a rack (5), a first force increasing gear (6), a second force increasing gear (8), a third connecting rod (11), a fourth connecting rod (12) and a piston (14).

[0008] The first universal joint is composed of the first universal joint input fork (31), the first universal joint cross shaft (32) and the first universal joint output fork (33); the first universal joint input fork (31) is connected with the universal joint mounting shaft (30) through the first key groove (29), the first universal joint cross shaft (32) is connected with the first universal joint input fork (31) and the first universal joint output fork (33), and the first universal joint output fork (33) is connected with the upper end transmission shaft.

[0009] The telescopic transmission shaft body has a cylindrical structure and is composed of the upper end transmission shaft (34) and the lower end transmission shaft (35), the upper end is connected with the first universal joint output fork (33), and the lower end is connected with the second universal joint upper end (36).

[0010] The second universal joint is composed of the second universal joint input fork (36), the second universal joint cross shaft (37) and the second universal joint output fork (38); the second universal joint input fork (36) is connected with the lower end transmission shaft (35) of the telescopic transmission shaft, the second universal joint cross shaft (37) is connected with the second universal joint input fork (36) and the second universal joint output fork (38), and the second universal joint output fork (38) is connected with the upper end of the input shaft (1).

[0011] The axis of the input shaft (1) is perpendicular to the lower end surface (A4) of the force increasing mechanism shell, the lower end is connected with the first connecting rod (3) through the second key groove (39) and the third key groove (40), and the input shaft (1) is fixed through the input shaft fixing support (2).

[0012] The first connecting rod (3) has two connecting ends, the rear end has a through hole, the upper and lower end faces are parallel to the lower end face (A4) of the force increasing mechanism shell, the rear end is connected with the second key groove (39) and the third key groove (40) of the input shaft through a flat key, the front end is connected with the second connecting rod (4) through a first shaft pin (41), and the first connecting rod can rotate around the axis of the input shaft (1).

[0013] The second connecting rod (4) has two connecting ends, the rear end has a through hole, the upper and lower end faces are parallel to the lower end face (A4) of the force increasing mechanism shell (26), the rear end is connected with the first connecting rod (3) through a first shaft pin (41), and the front end is connected with the rack (5) through a second shaft pin (42). The second connecting rod can rotate around the rear end first shaft pin (41).

[0014] The rack (5) has upper and lower end faces parallel to the lower end face (A4) of the force increasing mechanism shell, a through hole is formed in the rear end, and the rack is connected with the second connecting rod (4) through a second shaft pin (42).

[0015] The first force increasing gear (6) has upper and lower end faces parallel to the lower end face (A4) of the force increasing mechanism shell, a through hole is formed in the middle of the gear, and the first force increasing gear is fixedly connected through a first force increasing gear support (7); the upper end of the first force increasing gear (6) is provided with a third shaft pin (43) connected with the third connecting rod (11).

[0016] The second force increasing gear (8) has upper and lower end faces parallel to the lower end face (A4) of the force increasing mechanism shell, a through hole is formed in the middle of the gear, and the second force increasing gear is fixedly connected through a second force increasing gear support (10); the upper end of the second force increasing gear (8) is provided with a fourth shaft pin (9) connected with the fourth connecting rod (12); the first force increasing gear (6) and the second force increasing gear (8) are meshed with the rack (5), so that the rack (5) can move axially along the first piston through hole (56).

[0017] The third connecting rod (11) has two connecting ends, through holes are formed in the front and rear ends, and the upper and lower end faces are parallel to the lower end face (A4) of the force increasing mechanism shell; the rear end is connected with the first force increasing gear (6) through a third shaft pin (43), and the front end is connected with a piston connecting rod (13).

[0018] The fourth connecting rod (12) has two connecting ends, through holes are formed in the front and rear ends, and the upper and lower end faces are parallel to the lower end face (A4) of the force increasing mechanism shell (26); the rear end is connected with the second force increasing gear (8) through a fourth shaft pin (9), and the front end is connected with the piston connecting rod (13).

[0019] The piston (14) has a circular ring structure, and the cross section is rectangular; the front end face C1 of the piston is used for fixedly connecting a first friction plate (17), and a piston connecting rod (13) is fixedly connected in the piston; the axis of the piston connecting rod (13) is perpendicular to the lower end face (A4) of the force increasing mechanism shell and parallel to the central axis of the input shaft (1).

[0020] The mounting base includes an end cover (50), an actuator housing and a bracket.

[0021] The actuator housing includes a force amplifier housing (26), a brake caliper (22), an input shaft fixing support (2), a first force amplifier gear support (7), and a second force amplifier gear support (10).

[0022] The force amplifier housing (26) is a cylindrical structure, and a first piston mounting through hole (56) is arranged on the inner end face of the force amplifier housing.

[0023] The input shaft fixing support (2) is fixedly installed on the rear end face (A1) of the force amplifier housing; the first force amplifier gear support (7) is fixedly installed on the right end face (A3) of the force amplifier housing; and the second force amplifier gear support (10) is fixedly installed on the left end face (A2) of the force amplifier housing.

[0024] The brake caliper (22) is a left-right symmetrical structure, and a second piston mounting through hole (55) is arranged in the middle.

[0025] The rear end face (B1) of the brake caliper is fixedly connected with the front end face (A6) of the force amplifier housing.

[0026] The center axis of the second piston mounting through hole (55) on the brake caliper (22) coincides with the center axis of the first piston mounting through hole (56) of the force amplifier housing (26), and the radii are equal.

[0027] On the second piston mounting through hole (55), a first annular groove (53) for mounting a dustproof ring (16) and a second annular groove (54) for mounting a sealing ring (15) are arranged in sequence in the direction from the first friction plate (17) to the force amplifier housing (26).

[0028] The mechanism is characterized by utilizing the motion characteristics of the connecting rod mechanism, i.e. the force gain coefficient tends to infinity near the structural dead point, to realize the functions of motion conversion and force gain of the electromechanical brake actuator.

[0029] Compared with the traditional brake system scheme: the scheme can realize all functions of the traditional brake through the traditional rotary motor and the related transmission system, and can realize active braking, thereby providing a solution for the traditional vehicle brake system, the decoupling type brake energy recovery of new energy vehicles, and the brake system of intelligent driving vehicles.

[0030] Compared with the existing electromechanical brake actuator: the scheme adopts a connecting rod as a transmission force increasing mechanism, which is a completely new structure form, and under the same motor torque, the scheme can generate greater braking force; the scheme can effectively reduce the unsprung mass by shifting the motor to the vehicle body installation, improve the damper response speed, and thus improve the smoothness during vehicle driving; compared with the traditional electromechanical brake, the scheme can effectively reduce the size of the electromechanical brake actuator under the premise of meeting the braking demand of the whole vehicle, and can effectively meet the braking demand of large vehicles. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a sectional view of a one-way distributed electromechanical brake actuator based on multi-link transmission.

[0032] Figure 2 It is a side view of the motor (27).

[0033] Figure 3 It is an explosion view of the first universal joint.

[0034] Figure 4 It is an explosion view of the telescopic transmission shaft.

[0035] Figure 5 It is an explosion view of the second universal joint.

[0036] Figure 6 It is a three-dimensional structure diagram of the input shaft (1).

[0037] Figure 7 It is a three-dimensional structure diagram of the first connecting rod (3).

[0038] Figure 8 It is a three-dimensional structure diagram of the second connecting rod (4).

[0039] Figure 9 It is a three-dimensional structure diagram of the rack (5).

[0040] Figure 10 It is a three-dimensional structure diagram of the first force increasing gear (6).

[0041] Figure 11 It is a three-dimensional structure diagram of the second force increasing gear (8).

[0042] Figure 12 It is a three-dimensional structure diagram of the third connecting rod (11).

[0043] Figure 13 It is a three-dimensional structure diagram of the fourth connecting rod (12).

[0044] Figure 14 It is a three-dimensional structure diagram of the piston (14).

[0045] Figure 15Figure 1 is a front view of the piston (14).

[0046] Figure 16 Figure 2 is a three-dimensional view of the actuator housing structure.

[0047] Figure 17 Figure 3 is an exploded view of the actuator housing.

[0048] Figure 18 Figure 4 is a structural view of the end cap (50).

[0049] Figure 19 Figure 5 is a sectional view of the actuator housing Figure 1 .

[0050] Figure 20 Figure 6 is a sectional view of the actuator housing Figure 2 (separated state).

[0051] Figure 21 Figure 7 is a front view of the actuator housing.

[0052] Figure 22 Figure 8 is a three-dimensional structural view of the bracket.

[0053] Figure 23 Figure 9 is an exploded view of the three-dimensional structure of the bracket.

[0054] Figure 24 Figure 10 is a front view of the bracket.

[0055] Figure 25 Figure 11 is a top view of the bracket.

[0056] Figure 26 Figure 12 is a three-dimensional view of the electromechanical brake actuator.

[0057] In the figure: 1, input shaft; 2, input shaft fixed support; 3, first connecting rod; 4, second connecting rod; 5, rack;

[0058] 6, first booster gear; 7, first booster gear support; 8, second booster gear; 9, fourth shaft pin; 10, second booster gear support; 11, third connecting rod; 12, fourth connecting rod; 13, piston connecting rod; 14, piston; 15, sealing ring; 16, dustproof ring; 17, first friction plate; 18, first fixed bolt; 19, brake disc; 20, first bracket arm;

[0059] 21, second friction plate; 22, brake caliper; 23, brake caliper limiting cross bar; 24, second bracket arm; 25, second fixed bolt; 26, booster mechanism housing; 27, motor; 28, motor shaft; 29, first keyway; 30, universal joint mounting shaft;

[0060] 31, first universal joint input fork; 32, first universal joint cross; 33, first universal joint output fork; 34, upper end transmission shaft; 35, lower end transmission shaft; 36, second universal joint input fork; 37, second universal joint cross; 38, second universal joint output fork; 39, second keyway; 40, third keyway; 41, first shaft pin; 42, second shaft pin; 43, third shaft pin; 44, second support rod; 45, second support rod connecting hole; 46, first support rod; 47, first support rod connecting hole; 48, second end cover fixing threaded hole; 49, second input shaft through hole; 50, end cover; 51, first input shaft through hole;

[0061] 52, first end cover fixing threaded hole; 53, first annular groove; 54, second annular groove; 55, second piston mounting through hole; 56, first piston mounting through hole; 57, second mounting threaded hole; 58, first mounting threaded hole; 59, first bracket hub fixing threaded hole; 60, second bracket hub fixing threaded hole; 61, bracket fixed cross bar.

[0062] The meanings of the various end faces in the figure are as follows:

[0063] Figures 14-15 C1, front end face of piston; C2, rear end face of piston.

[0064] Figures 19-21 A1, rear end face of force amplification mechanism housing; A2, left end face of force amplification mechanism housing; A3, right end face of force amplification mechanism housing; A4, lower end face of force amplification mechanism housing; A5, upper end face of force amplification mechanism housing; A6, front end face of force amplification mechanism housing; B1, rear end face of brake caliper.

[0065] Figures 22-23 D1, brake caliper limiting face; D2, upper end face of second bracket arm; D3, upper end face of first bracket arm; D4, front end face of second bracket arm; D5, front end face of first bracket arm; D6, front end face of bracket fixed cross bar; D7, upper end face of second bracket fixed cross bar; D8, upper end face of first bracket fixed cross bar. DETAILED DESCRIPTION

[0066] The present application provides a one-way distributed electronic mechanical brake actuator based on multi-link transmission. In order to make the technical solutions and effects of the present application clearer and more explicit, the present application is further described in detail with reference to the drawings and examples. It should be understood that the specific implementation described herein is only used to explain the present application and does not limit the present application.

[0067] A one-way distributed electronic mechanical brake actuator based on multi-link transmission is composed of a motor, a transmission force amplification mechanism and a mounting base.

[0068] The motor (27) is a rotary motor.

[0069] As shown in Figure 2 , the motor (27) is a rotary motor, the front part of the motor shaft (28) is a universal joint mounting shaft (30), the first key groove (29) is arranged on the universal joint mounting shaft (30); the diameter of the universal joint mounting shaft (30) is smaller than the diameter of the motor shaft (28), and the first universal joint input fork (31) is connected with the universal joint mounting shaft (30) through the first key groove (29).

[0070] As shown in Figure 1 , 3 -15, the transmission force increasing mechanism includes a first universal joint input fork (31), a first universal joint cross shaft (32), a first universal joint output fork (33), an upper end transmission shaft (34), a lower end transmission shaft (35), a second universal joint input fork (36), a second universal joint cross shaft (37), a second universal joint output fork (38), an input shaft (1), a first connecting rod (3), a second connecting rod (4), a rack (5), a first force increasing gear (6), a second force increasing gear (8), a third connecting rod (11), a fourth connecting rod (12), and a piston (14).

[0071] As shown in Figure 3 , the first universal joint is composed of the first universal joint input fork (31), the first universal joint cross shaft (32) and the first universal joint output fork (33); the first universal joint input fork (31) is connected with the universal joint mounting shaft (30) through the first key groove (29), the first universal joint cross shaft (32) is connected with the first universal joint input fork (31) and the first universal joint output fork (33); and the first universal joint output fork (33) is connected with the upper end transmission shaft.

[0072] As shown in Figure 4 , the telescopic transmission shaft body is a cylindrical structure, which is composed of the upper end transmission shaft (34) and the lower end transmission shaft (35), the upper end is connected with the first universal joint output fork (33), and the lower end is connected with the second universal joint upper end (36).

[0073] As shown in Figure 5 , the second universal joint is composed of the second universal joint input fork (36), the second universal joint cross shaft (37) and the second universal joint output fork (38); the second universal joint input fork (36) is connected with the lower end transmission shaft (35) of the telescopic transmission shaft, the second universal joint cross shaft (37) is connected with the second universal joint input fork (36) and the second universal joint output fork (38); and the second universal joint output fork (38) is connected with the upper end of the input shaft (1).

[0074] As shown in Figure 1 , 6As shown, the input shaft (1) axis is perpendicular to the lower end face (A4) of the force amplifier housing, the lower end is connected with the first connecting rod (3) through the second key groove (39) and the third key groove (40), and the input shaft (1) is fixed through the input shaft fixed support (2).

[0075] As shown in Figure 1 , 7 , the first connecting rod (3) has two connecting ends, the rear end is provided with a through hole, and the upper and lower end faces are parallel to the lower end face (A4) of the force amplifier housing; the rear end is connected with the second key groove (39) and the third key groove (40) of the input shaft through a flat key, the front end is connected with the second connecting rod (4) through a first shaft pin (41), and the first connecting rod can rotate around the axis of the input shaft (1).

[0076] As shown in Figure 1 , 8 , the second connecting rod (4) has two connecting ends, the rear end is provided with a through hole, and the upper and lower end faces are parallel to the lower end face (A4) of the force amplifier housing (26); the rear end is connected with the first connecting rod (3) through the first shaft pin (41), and the front end is connected with the rack (5) through the second shaft pin (42); the second connecting rod can rotate around the first shaft pin (41) at the rear end.

[0077] As shown in Figure 1 , 9 , the rack (5) has upper and lower end faces parallel to the lower end face (A4) of the force amplifier housing, and the rear end is provided with a through hole and is connected with the second connecting rod (4) through the second shaft pin (42).

[0078] As shown in Figure 1 , 10 , the first force amplification gear (6) has upper and lower end faces parallel to the lower end face (A4) of the force amplifier housing, and a through hole is formed in the middle of the gear and is fixedly connected through the first force amplification gear support (7); the upper end of the first force amplification gear (6) has a third shaft pin (43) connected with the third connecting rod (11).

[0079] As shown in Figure 1 , 11 , the second force amplification gear (8) has upper and lower end faces parallel to the lower end face (A4) of the force amplifier housing, and a through hole is formed in the middle of the gear and is fixedly connected through the second force amplification gear support (10); the upper end of the second force amplification gear (8) has a fourth shaft pin (9) connected with the fourth connecting rod (12); the first force amplification gear (6) and the second force amplification gear (8) are meshed with the rack (5), so that the rack (5) can move axially along the first piston through hole (56).

[0080] As shown in Figure 1 , 12As shown in the figure, the third connecting rod (11) has two connecting ends, each of which has a through hole, and the upper and lower end faces are parallel to the lower end face (A4) of the force amplifier housing. The rear end is connected to the first force amplification gear (6) through a third shaft pin (43), and the front end is connected to the piston connecting rod (13).

[0081] As shown in the figure, Figure 1 , 13 , the fourth connecting rod (12) has two connecting ends, each of which has a through hole, and the upper and lower end faces are parallel to the lower end face (A4) of the force amplifier housing (26). The rear end is connected to the second force amplification gear (8) through a fourth shaft pin (9), and the front end is connected to the piston connecting rod (13).

[0082] As shown in the figure, Figure 1 , 14 -15, the piston (14) is a circular ring structure, and its cross section is rectangular. The front end face C1 of the piston is used to fixedly connect the first friction plate (17), and the piston connecting rod (13) is fixedly connected inside the piston. The axis of the piston connecting rod (13) is perpendicular to the lower end face (A4) of the force amplifier housing and parallel to the central axis of the input shaft (1).

[0083] As shown in the figure, Figure 1 , 2 , 16-21, the mounting base includes an end cover (50), an actuator housing, and a bracket. After the input shaft (1) passes through the first input shaft through hole (51) on the end cover (50), it is connected to the rear end of the first connecting rod (3) through the second key groove (39) and the third key groove (40).

[0084] As shown in the figure, Figure 18 , the end cover (50) is provided with a first input shaft through hole (51) and four first end cover fixed threaded holes (52). The first end cover fixed threaded holes (52) mainly serve to fix the end cover (50), and the number is not limited to four, which can be increased or decreased according to the actual installation situation.

[0085] As shown in the figure, Figure 1 , 17 -20, the actuator housing includes a force amplifier housing (26) and a brake caliper (22).

[0086] As shown in the figure, Figure 1 , 17 , the force amplifier housing (26) is a cylindrical structure. The force amplifier housing upper end face (A5) is provided with second end cover fixed threaded holes (48) matched with the first end cover fixed threaded holes (52) and a second input shaft through hole (49) matched with the first input shaft through hole (51) on the end cover (50). The number of the two is the same and the position is one-to-one corresponding.

[0087] As shown in the figure, Figure 1 , 19The first piston mounting through hole (56) is coaxial with the center axis of the second piston mounting through hole (55) on the brake caliper (22) and has equal radius. The input shaft fixed support (2) is fixedly installed on the rear end surface (Al) of the force amplification mechanism housing; the second force amplification gear support (10) is fixedly installed on the left end surface (A2); and the first force amplification gear support (7) is fixedly installed on the right end surface (A3).

[0088] As shown in Figure 1 , 16 The brake caliper (22) is a left-right symmetrical structure and is provided with the second piston mounting through hole (55) in the middle.

[0089] As shown in Figure 19 , 20 On the second piston mounting through hole (55), the first annular groove (53) and the second annular groove (54) are sequentially arranged in the direction from the first friction plate (17) to the force amplification mechanism housing (22), the first annular groove (53) is used for mounting the dustproof ring (16), and the second annular groove (54) is used for mounting the sealing ring (15); the rear end surface (B1) of the brake caliper is fixedly connected with the front end surface (A6) of the force amplification mechanism housing; the center axis of the second piston mounting through hole (55) on the brake caliper is coaxial with the center axis of the first piston mounting through hole (56) of the force amplification mechanism housing and has equal radius.

[0090] As shown in Figures 22-25 The bracket is composed of the first bracket arm (20), the brake caliper limiting cross rod (23), the second bracket arm (24) and the bracket fixed cross rod (61), and the first bracket arm (20), the brake caliper limiting cross rod (23) and the second bracket arm (24) are all cuboid structures.

[0091] As shown in Figures 22-23As shown, a first mounting threaded hole (58) is provided in the length direction of the first support arm (20), and the central axis of the first mounting threaded hole (58) is perpendicular to the front end face (D5) of the first support arm; a second mounting threaded hole (57) is provided in the length direction of the second support arm (24), and the central axis of the second mounting threaded hole (57) is perpendicular to the front end face (D4) of the second support arm; the first support arm (20) is fixedly connected to the brake caliper limiting surface (D1) of the brake caliper limiting crossbar (23) through the end face opposite to the front end face (D5) of the first support arm; the second support arm (24) is fixedly connected to the brake caliper limiting surface (D1) of the brake caliper limiting crossbar (23) through the end face opposite to the front end face (D4) of the second support arm; the second support arm (24), The brake caliper limiting crossbar (23) and the first support arm (20) together form a U-shaped bracket; the bracket fixing crossbar (61) has a U-shaped structure, and its front end face (D6) is symmetrically provided with a first bracket hub fixing threaded hole (59) and a second bracket hub fixing threaded hole (60) with the central axis perpendicular to the front end face (D6). It can be fixedly connected to the hub through the first bracket hub fixing threaded hole (59) and the second bracket hub fixing threaded hole (60) and bolts; the second support arm (24) is fixedly connected to the upper end face (D7) of the second bracket fixing crossbar through the end face opposite to the upper end face (D2) of the second support arm; the first support arm (20) is fixedly connected to the upper end face (D8) of the first bracket fixing crossbar through the end face opposite to the upper end face (D3) of the first support arm; after installation, the bracket is as follows Figure 22 As shown.

[0092] like Figures 21-23 As shown, the first support rod connecting hole (47) corresponds to the first mounting threaded hole (58) of the bracket and is fixedly connected to the actuator housing by the first fixing bolt (18) of the bracket; the second support rod connecting hole (45) corresponds to the second mounting threaded hole (57) of the bracket and is fixedly connected to the actuator housing by the second fixing bolt (25) of the bracket.

[0093] The working principle of the unidirectional distributed electromechanical brake actuator based on multi-link transmission proposed in this invention is as follows: The process of applying braking and adjusting the braking force is as follows:

[0094] When the driver steps on the brake pedal, the motor (27) is energized, the universal joint mounting shaft (30) rotates, drives the first universal joint input end (31) to rotate through the first key groove (29), and then the power is transmitted to the telescopic transmission shaft upper end (34) through the first universal joint cross shaft (32) and the first universal joint output end (33); the telescopic transmission shaft drives the telescopic transmission shaft lower end (35) to rotate through the spline, transmits the power to the second universal joint input end (36), and then the power is transmitted to the input shaft (1) through the second universal joint cross shaft (37) and the second universal joint output end (38). The input shaft (1) is connected with the first connecting rod (3) through the cooperation of the second key groove (39) and the third key groove (40), so that the first connecting rod (3) is rotated, the first connecting rod (3) drives the second connecting rod (4) to rotate through the first shaft pin (41), and when the second connecting rod (4) drives the rack (5) to move to the left, the second connecting rod (4) drives the rack (5) to move to the left along the piston axis direction under the constraint action of the first power gear (6) and the second power gear (8), so as to drive the first power gear (6) and the second power gear (8) to rotate, the first power gear (6) and the second power gear (8) drive the third connecting rod (11) and the fourth connecting rod (12) to push the piston (14) to move to the left, under the limiting action of the first piston mounting through hole (56) and the second piston mounting through hole (55), the piston (14) can only move forward, so as to push the first friction plate (17) to press against the brake disc (19), when the first friction plate (17) contacts with the brake disc (19), the whole actuator moves to the motor side under the reaction of the positive pressure applied by the first friction plate (17) to the brake disc (19), so as to press the second friction plate (21) to the brake disc (19), and finally the brake disc is applied with braking force through the first friction plate (17) and the second friction plate (21).

[0095] During the process of applying the brake, the driver controls the motor (23) to output the motor torque through the brake pedal opening, so as to realize the adjustment of the brake force. When the relative position between the wheel and the vehicle body changes during the vehicle running, the first universal joint, the telescopic transmission shaft and the second universal joint can ensure that the angle and distance between the wheel and the vehicle body change frequently, and the brake force can still be reliably transmitted to ensure the normal operation of the electronic mechanical brake system and the normal running of the vehicle.

[0096] The process of releasing the brake is as follows:

[0097] When the driver releases the brake pedal, the motor (27) is powered, the universal joint mounting shaft (30) is reversed, the first universal joint input fork (31) is driven to rotate through the first key groove (29), and then the power is transmitted to the telescopic transmission shaft upper end (34) through the first universal joint cross shaft (32) and the first universal joint output fork (33); the telescopic transmission shaft drives the telescopic transmission shaft lower end (35) to rotate through the spline, and the power is transmitted to the second universal joint input fork (36), and then the power is transmitted to the input shaft (1) through the second universal joint cross shaft (37) and the second universal joint output fork (38); the input shaft (1) is connected with the first connecting rod (3) through the second key groove (39) and the third key groove (40), so that the first connecting rod (3) is driven to rotate, the first connecting rod (3) drives the second connecting rod (4) to rotate through the first shaft pin (41), when the second connecting rod (4) drives the rack (5) to move to the right, the second connecting rod (4) drives the rack (5) to move to the right along the piston axis direction under the constraint of the first force amplification gear (6) and the second force amplification gear (8), so as to drive the first force amplification gear (6) and the second force amplification gear (8) to rotate reversely, the first force amplification gear (6) and the second force amplification gear (8) drive the third connecting rod (11) and the fourth connecting rod (12) to pull the piston (14) to move to the right, so as to correspondingly reduce the pressure applied to the piston (14), that is, the pressure applied to the brake disc (19) is reduced, when the pressure applied to the piston (14) by the motor (27) is reduced to 0, under the rotary motion of the brake disc (19), the first friction plate (17) and the second friction plate (21) completely separate from the brake disc, and the brake pressure applied to the brake disc (19) is reduced to 0.

Claims

1. A multi-link transmission based unidirectional distributed electromechanical brake actuator characterized by: Mainly by motor, transmission force increasing mechanism and installation base body composition; The motor (27) is a rotating motor, the shell is fixedly connected with the bottom of the vehicle body, the front part of the motor shaft (28) is a universal joint mounting shaft (30), the universal joint mounting shaft (30) is provided with a first key groove (29), the diameter of the universal joint mounting shaft (30) is less than the diameter of the motor shaft (28), and the first universal joint input fork (31) is connected with the universal joint mounting shaft (30) through the first key groove (29); The first universal joint is composed of the first universal joint input fork (31), the first universal joint cross shaft (32) and the first universal joint output fork (33); the first universal joint input fork (31) is connected with the universal joint mounting shaft (30) through the first key groove (29), the first universal joint cross shaft (32) is connected with the first universal joint input fork (31) and the first universal joint output fork (33); and the first universal joint output fork (33) is connected with the upper end transmission shaft; The second universal joint is composed of the second universal joint input fork (36), the second universal joint cross shaft (37) and the second universal joint output fork (38); the second universal joint input fork (36) is connected with the lower end transmission shaft (35) of the telescopic transmission shaft, the second universal joint cross shaft (37) is connected with the second universal joint input fork (36) and the second universal joint output fork (38); The axis of the input shaft (1) is perpendicular to the lower end surface (A4) of the force increasing mechanism shell, the lower end is connected with the first connecting rod (3) through the second key groove (39) and the third key groove (40), and the input shaft (1) is fixed through the input shaft fixed support (2); The first connecting rod (3) has two connecting ends, a through hole is formed in the rear end, the upper and lower end surfaces are parallel to the lower end surface (A4) of the force increasing mechanism shell, the rear end is connected with the second key groove (39) and the third key groove (40) through a flat key, the front end is connected with the second connecting rod (4) through a first shaft pin (41), and the first connecting rod can rotate around the axis of the input shaft (1); The second connecting rod (4) has two connecting ends, a through hole is formed in the rear end, the upper and lower end surfaces are parallel to the lower end surface (A4) of the force increasing mechanism shell, the rear end is connected with the first connecting rod (3) through the first shaft pin (41), and the front end is connected with the rack (5) through a second shaft pin (42); the second connecting rod (4) can rotate around the rear end first shaft pin (41); The rack (5) has upper and lower end surfaces parallel to the lower end surface (A4) of the force increasing mechanism shell, a through hole is formed in the rear end, and the rack is connected with the second connecting rod (4) through the second shaft pin (42); The first force increasing gear (6) has upper and lower end surfaces parallel to the lower end surface (A4) of the force increasing mechanism shell, a through hole is formed in the middle of the gear, and the first force increasing gear is fixedly connected through the first force increasing gear support (7); the first force increasing gear (6) has a third shaft pin (43) at the upper end, and the third shaft pin is connected with the third connecting rod (11); The second force increasing gear (8) has upper and lower end surfaces parallel to the lower end surface (A4) of the force increasing mechanism shell, a through hole is formed in the middle of the gear, and the second force increasing gear is fixedly connected through the second force increasing gear support (10); the second force increasing gear (8) has a fourth shaft pin (9) at the upper end, and the fourth shaft pin is connected with the fourth connecting rod (12); The third connecting rod (11) has two connecting ends, each of which has a through hole, and the upper and lower end faces are parallel to the lower end face (A4) of the force amplifier housing. The rear end is connected to the first force amplification gear (6) through a third shaft pin (43), and the front end is connected to the piston connecting rod (13). The fourth connecting rod (12) has two connecting ends, each of which has a through hole, and the upper and lower end faces are parallel to the lower end face (A4) of the force amplifier housing. The rear end is connected to the second force amplification gear (8) through a fourth shaft pin (9), and the front end is connected to the piston connecting rod (13). The force amplifier housing (26) is a cylindrical structure, and a first piston mounting through hole (56) is provided on the inner end face of the force amplifier housing. The input shaft fixed support (2) is fixedly installed on the rear end face (A1) of the force amplifier housing. The first force amplification gear support (7) is fixedly installed on the right end face (A3) of the force amplifier housing. The second force amplification gear support (10) is fixedly installed on the left end face (A2) of the force amplifier housing. The brake caliper (22) is a left-right symmetrical structure, and a second piston mounting through hole (55) is provided in the middle. The rear end face (B1) of the brake caliper is fixedly connected with the front end face (A6) of the force amplifier housing. The center axis of the second piston mounting through hole (55) on the brake caliper (22) coincides with the center axis of the first piston mounting through hole (56) of the force amplifier housing (26), and the radii are equal.

2. A unidirectional distributed electronic mechanical brake actuator based on multi-linkage transmission according to claim 1, characterized in that: On the second piston mounting through hole (55), a first annular groove (53) and a second annular groove (54) are provided in sequence in the direction from the first friction plate (17) to the force amplifier housing (26). The first annular groove (53) is used for installing a dustproof ring (16), and the second annular groove (54) is used for installing a sealing ring (15).

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