CN110701216A - A one-way booster electromechanical brake actuator based on rotating motor and rack and pinion - Google Patents

Abstract

The invention provides a unidirectional reinforcement type electromechanical brake actuator based on a rotating motor and a gear rack, which is applied to an automobile and comprises three parts, namely the rotating motor, an installation base body and a transmission reinforcement mechanism; the transmission force increasing mechanism comprises a rack, a force increasing block, a piston, a gear, a first cylindrical roller and a second cylindrical roller, wherein the gear is fixed at the end part of a motor shaft, and the rack is fixed at the lower end of the force increasing block; the first inclined surface of the force increasing block and the second inclined surface of the force increasing block are respectively contacted with the first cylindrical roller and the second cylindrical roller; when braking needs to be applied, the motor rotates to drive the gear to rotate, the rack moves rightwards, the force increasing block moves rightwards along with the rack, so that the piston and the first friction plate are pushed to press the brake disc, the actuator is driven to move towards the motor side along the guide rail under the action of reaction force, the second friction plate is pressed towards the brake disc, braking force is applied, the size of the braking force can be adjusted by adjusting the force of the motor, and the scheme can provide a solution for traditional braking and future intelligent braking and active braking.

Description

A one-way booster electromechanical brake actuator based on rotating motor and rack and pinion runner

technical field

The invention belongs to the technical field of automobile braking, and in particular relates to a one-way booster type electromechanical brake actuator based on a rotary motor and a rack and pinion.

Background technique

As an important part that directly affects the driving safety of automobiles, the braking system has always been a research hotspot of major automobile companies; and stability control system research [D]. Changchun: Jilin University, 2009), as a new braking system, electromechanical braking has abandoned the large components such as vacuum booster and hydraulic pipeline, making the whole vehicle The chassis layout is simpler and more flexible, and it has the advantages of fast and accurate pressure adjustment, which can significantly improve the braking performance of the whole vehicle.

In addition to the advantages of improving the braking safety of traditional automobiles, electromechanical braking can also effectively solve the requirements of new energy vehicles and autonomous vehicles for braking systems; "(Yang Kun, Gao Song, Wang Jie, et al. Research on EMB-based Decoupling Brake Energy Recovery System [J]. Automotive Engineering, 2016, 38(8): 1072-1079.), Electromechanical Braking The system can meet the requirements of the decoupling braking energy recovery system for precise and independent adjustment of brake pedal feel and wheel braking force, and can realize active braking function. It is of great significance to promote the electrification and intelligence of automobiles, which makes it once again become the focus of research on automobile braking systems.

At present, the electro-mechanical brake is still in the research stage in our country. How to effectively reduce the volume and mass of the electro-mechanical brake actuator under the premise of meeting the braking requirements of the whole vehicle has become the key to its popularization and application. Based on the previous research, a new structure of electromechanical brake actuator is proposed, which can effectively reduce the volume of the electromechanical brake actuator and can effectively meet the braking requirements of large vehicles.

SUMMARY OF THE INVENTION

The present invention provides a one-way force-enhancing electromechanical brake actuator based on a rotating motor and a rack and pinion, the technical solution of which is as follows:

A one-way force-enhancing electromechanical brake actuator based on a rotating motor and a rack and pinion is characterized in that it is mainly composed of a motor, an installation base, and a transmission force-enhancing mechanism.

The motor (1) is a rotary motor.

The front part of the motor shaft (2) is a gear installation shaft (23), the gear installation shaft (23) is provided with a first keyway (24), the central axis of the motor shaft (2) and the central axis of the gear installation shaft (23) Coincidentally, the diameter of the gear installation shaft (23) is smaller than the diameter of the motor shaft (2), and the boss formed by the gear installation shaft (23) and the motor shaft (2) is used for the axial positioning of the gear (22).

The installation base includes an end cover (4), an actuator housing and a bracket; after the motor shaft (2) passes through the motor shaft through hole (28) on the end cover (4), it passes through the flat key (21), the first keyway (24) and the second keyway (26) is matched and connected with the central hole (27) of the gear (22).

The actuator housing comprises a booster mechanism housing (6) and a brake caliper (15); the booster mechanism housing (6) is a cylindrical structure; the inner end face (B1) of the booster mechanism housing is provided with a first A piston installation through hole (33); a first cylindrical guide rail support (34) and a second cylindrical guide rail are fixedly installed on both sides of the first piston installation through hole (33) on the inner end face (B1) of the booster mechanism housing A support (39), a cylindrical guide rail (9) is fixedly installed between the first cylindrical guide rail support (34) and the second cylindrical guide rail support (39). The cylindrical guide rail (9) is parallel to the upper end face of the booster block (8) and perpendicular to the central axis of the motor shaft (2).

The brake caliper (15) has a left-right symmetrical structure, and a second piston installation through hole (38) is arranged in the middle.

The rear end surface (A2) of the brake caliper is fixedly connected with the front end surface (C1) of the housing of the booster mechanism.

The central axis of the second piston installation through hole (38) on the brake caliper (15) coincides with the central axis of the first piston installation through hole (33) of the booster mechanism housing (6) and has the same radius.

A first annular groove (40) and a second annular groove (41) are sequentially provided on the second piston installation through hole (38) along the direction of the first friction plate (14) to the booster mechanism housing (6). , the first annular groove (40) is used for installing the dust ring (13), and the second annular groove (41) is used for installing the sealing ring (12).

The transmission power-enhancing mechanism includes a rack (7), a power-enhancing block (8), a piston (11), a gear (22), a first cylindrical roller (20) and a second cylindrical roller (46).

The upper and lower end faces of the booster block (8) are parallel to each other, and each side is perpendicular to its upper and lower end faces; the left end face (A3) of the booster block is provided with a circular through hole (44) whose central axis is perpendicular to the end face, and a cylindrical guide rail (9). ) through the circular through hole (44), the booster block (8) can move axially along the cylindrical guide rail (9), the first slope (B3) of the booster block and the second slope (C3) of the booster block are located at the On the same side of the block (8), there are two inclined surfaces with the same shape, which are parallel to each other, and the inclined surfaces are perpendicular to the upper and lower end surfaces.

The rack (7) is fixed on the lower end face of the booster block (8), the teeth of the rack (7) are perpendicular to the central axis of the cylindrical guide rail (9) and the circular through hole (44); the gear (22) and the rack (7) Matching connection.

The main body of the piston (11) has a circular structure with a rectangular cross-section. The front end surface (A4) of the piston is used for fixedly connecting the first friction plate (14), and the rear end surface (B4) of the piston is fixedly connected with a first cylindrical roller. The support (10), the second cylindrical roller support (19), the third cylindrical roller support (45), the fourth cylindrical roller support (47); the two ends of the first cylindrical roller (20) are respectively It is supported between the first cylindrical roller support (10) and the second cylindrical roller support (19) through bearings; the two ends of the second cylindrical roller (46) are respectively supported on the third cylindrical roller support through bearings. (45) and the fourth cylindrical roller support (47); the central axes of the first cylindrical roller (20) and the second cylindrical roller (46) are parallel to each other, and both are parallel to the rear end face of the piston (B4) .

When the braking force is not 0, the first cylindrical roller (20) is always in contact with the first inclined surface (B3) of the force increasing block, and the second cylindrical roller (46) is always in contact with the second inclined surface (C3) of the force increasing block; During the whole movement process, the two contact lines are parallel to each other and perpendicular to the central axis of the circular through hole (44), and the plane where the two contact lines are located is perpendicular to the central axis of the piston (11).

Compared with the traditional braking system solution: this solution can realize all the functions of traditional braking through traditional rotating electrical machines and related transmission systems, and can realize active braking, thus providing solutions for traditional vehicle braking systems and new energy vehicles. Coupling braking energy recovery and braking systems for intelligent driving vehicles provide solutions.

Compared with the existing electro-mechanical brake actuators: this scheme adopts rack and pinion and force-enhancing block as the transmission force-enhancing mechanism, which is a brand-new structural form; under the same braking force demand, the structure of this scheme is more efficient. It is compact; in addition, the solution uses a rotating electric machine and a rack and pinion as the brake actuator, which can meet the needs of various models, especially the problem of large braking force requirements for large vehicles.

Description of drawings

Figure 1 is an assembly diagram of a one-way single-stage booster electromechanical brake actuator based on a motor and a rack and pinion.

Figure 2 is a front view of the motor (1).

Figure 3 is a side view of the motor (1).

Figure 4 is a side view of the gear (22).

Figure 5 is a structural diagram of the end cap (4).

Figure 6 is a three-dimensional view of the actuator housing.

FIG. 7 is a sectional view 1 of the actuator housing.

Fig. 8 is a sectional view 2 of the actuator housing (separated state).

Figure 9 is a left side view of the actuator housing (direction A).

Figure 10 is a right side view of the actuator housing (direction B).

Figure 11 is an exploded view of the actuator housing.

Figure 12 is an exploded view of the actuator housing 2.

Figure 13 is a three-dimensional structural diagram of a transmission booster mechanism.

Figure 14 is a top view of the transmission booster mechanism.

Figure 15 is a front view of the transmission booster mechanism.

Figure 16 is a side view of the transmission booster mechanism.

Figure 17 is a three-dimensional structural diagram of the piston mechanism.

Figure 18 is a side view of the piston mechanism.

Figure 19 is a front view of the piston mechanism.

Fig. 20 is a schematic diagram of the principle of force increase of the transmission force increase mechanism.

Figure 21 is a schematic diagram of the three-dimensional structure of the stent.

Figure 22 is an exploded view of the three-dimensional structure of the stent.

Figure 23 is a front view of the bracket.

Figure 24 is a plan view of the bracket.

Figure 25 is a top view of the bracket installation.

Figure 26 is a three-dimensional view of an electromechanical brake actuator.

In the figure: 1. Motor; 2. Motor shaft; 3. Motor fixing bolts; 4. End cover; 5. End cover fixing bolts; , cylindrical guide rail; 10, the first cylindrical roller bearing; 11, the piston; 12, the sealing ring; 13, the dust ring; 14, the first friction plate; 15, the brake caliper; 16, the brake caliper limit transverse Rod; 17, the second friction plate; 18, the brake disc; 19, the second cylindrical roller bearing; 20, the first cylindrical roller; 21, the flat key; 22, the gear; 23, the gear installation shaft; 24, The first keyway; 25, the first motor fixing screw hole; 26, the second keyway; 27, the gear center hole; 28, the motor shaft through hole; 29, the second motor fixing screw hole; 30, the first end cover fixing screw hole 31, the first support rod; 32, the first support rod connection hole; 33, the first piston installation through hole; 34, the first cylindrical guide rail support; 35, the second end cap fixing threaded hole; Rod connection hole; 37, second support rod; 38, second piston installation through hole; 39, second cylindrical guide rail support; 40, first annular groove; 41, second annular groove; 42, first cylindrical guide rail installation Hole; 43, the second cylindrical guide rail mounting hole; 44, the circular through hole; 45, the third cylindrical roller support; 46, the second cylindrical roller; 47, the fourth cylindrical roller support; 48, the center of the piston hole; 49, the first mounting threaded hole of the bracket; 50, the first bracket arm; 51, the second bracket arm; 52, the second mounting threaded hole of the bracket; 53, the first bracket hub fixing threaded hole; 54, the bracket fixing cross bar ; 55, the second bracket wheel hub fixed threaded hole; 56, the first fixing bolt of the bracket; 57, the second fixing bolt of the bracket.

The meanings of each end face and included angle in the figure are as follows:

In Figures 7-12: A1, the rear end face of the booster mechanism housing; B1, the inner end face of the booster mechanism casing; C1, the front end face of the booster mechanism casing; A2, the rear end face of the brake caliper.

In Figures 13 to 14 and 20: A3, the left end face of the booster block; B3, the first slope of the booster block; C3, the second slope of the booster block.

In Figures 17-18: A4, the front end face of the piston; B4, the rear end face of the piston.

In Fig. 20: A5, the central axis of the piston; α, the angle between the central axis of the piston A5 and the first inclined surface B3 of the power increasing block or the second inclined surface C3 of the power increasing block.

In Figure 21-22: A6, brake caliper limit surface; B6, left end surface of brake caliper limit cross bar; C6, upper end surface of the second bracket arm; D6, front end surface of the second bracket arm; E6, first bracket Fix the upper end face of the cross bar; F6, the second bracket fixes the upper end face of the cross bar; G6, the front end face of the first bracket arm; H6, the upper end face of the first bracket arm; I6, the bracket fixes the front end face of the cross bar.

specific implementation

The present invention provides a one-way booster type electromechanical brake actuator based on a rotating motor and a rack and pinion. In order to make the technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail with reference to the accompanying drawings and examples; It should be understood that the specific implementations described herein are only used to explain the present invention, but not to limit the present invention.

A one-way booster type electromechanical brake actuator based on a rotating motor and a gear rack is mainly composed of a motor, an installation base and a transmission booster mechanism.

The motor (1) is a rotary motor.

As shown in Figure 1-2, the front part of the motor shaft (2) is the gear installation shaft (23), the gear installation shaft (23) is provided with a first keyway (24), and the central axis of the motor shaft (2) is connected to the gear shaft (23). The central axes of the installation shaft (23) are coincident, the diameter of the gear installation shaft (23) is smaller than the diameter of the motor shaft (2), and the boss formed by the gear installation shaft (23) and the motor shaft (2) is used for the mounting of the gear (22). Axial positioning.

As shown in Figures 1, 2 and 4, the mounting base includes an end cover (4), an actuator housing and a bracket; after the motor shaft (2) passes through the motor shaft through hole (28) on the end cover (4), it passes through The flat key (21), the first keyway (24), and the second keyway (26) are matched and connected with the central hole (27) of the gear (22).

As shown in Figures 2 and 3, the boss at the end of the motor (1) is provided with eight first motor fixing screw holes (25). The first motor fixing screw holes (25) mainly serve to fix the motor, and the number varies. Limited to 8.

As shown in Figure 5, the end cover (4) is provided with one motor shaft through hole (28), eight second motor fixing screw holes (29), and eleven first end cover fixing screw holes (30); The second motor fixing screw holes (29) are mainly used for fixing the motor, and the number is not limited to 8, which can be increased or decreased according to the actual installation situation; the first end cover fixing screw holes (30) are used for fixing the end cover, and the number is not limited to 11. Increase or decrease according to the actual installation situation.

As shown in Figures 1, 6-12, the actuator housing includes a booster mechanism housing (6) and a brake caliper (15).

As shown in FIG. 6 , the booster mechanism housing (6) is a cylindrical structure, and a second end cover matched with the fixing screw hole (30) of the first end cover is provided on the rear end surface (A1) of the booster mechanism housing The fixed threaded holes (35) have the same number and one-to-one correspondence.

As shown in Figures 7 and 8, the inner end face (B1) of the booster mechanism housing is provided with a first piston installation through hole (33), the first piston installation through hole (33) and the first piston installation through hole (33) on the brake caliper (15) The central axes of the two piston mounting through holes (38) are coincident and have the same radius.

As shown in Figure 6-12, a first cylindrical guide rail support (34) and a second cylindrical guide rail support ( 39), a cylindrical guide rail (9) is fixedly installed between the first cylindrical guide rail support (34) and the second cylindrical guide rail support (39).

As shown in Figures 1 and 6-11, the cylindrical guide rail (9) is parallel to the upper end face of the booster block (8) and perpendicular to the central axis of the motor shaft (2).

As shown in Figures 9-12, the brake caliper (15) has a left-right symmetrical structure, and a second piston mounting through hole (38) is provided in the middle.

As shown in Figures 7-8, on the second piston installation through hole (38), along the direction of the first friction plate (14) to the booster mechanism housing (6), a first annular groove (40) is formed in sequence and a second annular groove (41), the first annular groove (40) is used for installing the dustproof ring (13), and the second annular groove (41) is used for installing the sealing ring (12).

As shown in Figures 7-8 and 11-12, the rear end surface (A2) of the brake caliper is fixedly connected to the front end surface (C1) of the booster housing.

As shown in Figures 7-8, the center axis of the first piston installation through hole (33) of the booster mechanism housing (6) and the second piston installation through hole (38) on the brake caliper (15) are coincident with the center axis and have the same radius .

As shown in Figures 9-12, a first support rod (31) and a second support rod (37) are symmetrically arranged on the left and right sides of the brake caliper (15), and a first support rod (31) is provided on the first support rod (31). A rod connecting hole (32), and a second supporting rod connecting hole (36) is provided on the second support rod (37).

As shown in Figures 1, 13-19, the transmission force-enhancing mechanism includes a rack (7), a force-enhancing block (8), a piston (11), a gear (22), a first cylindrical roller (20) and a second Cylindrical roller (46).

As shown in Figure 13-16, the upper and lower end faces of the booster block (8) are parallel to each other, and each side is perpendicular to its upper and lower end faces; the left end face (A3) of the booster block is provided with a circular through hole whose central axis is perpendicular to the end face. (44), the cylindrical guide rail (9) passes through the circular through hole (44), and the booster block (8) can move axially along the cylindrical guide rail (9). The two inclined planes (C3) are two inclined planes with the same shape, which are parallel to each other, and the inclined planes are perpendicular to the upper and lower end faces. The roller (20) is in contact with the second cylindrical roller (46), and the first inclined surface (B3) of the force intensifier and the second inclined surface (C3) of the force intensifier form an angle α with the piston axis A5, as shown in FIG. 20 .

As shown in Figures 13, 15-16, the rack (7) is fixed under the booster block (8), and the teeth of the rack (7) are perpendicular to the central axis of the cylindrical guide rail (9) and the circular through hole (44). The gear (22) is mounted on the gear mounting shaft (23) through the flat key (21), the first keyway (24) and the second keyway (26), and is connected with the rack (7).

As shown in Figures 17-19, the main body of the piston (11) is a circular structure with a rectangular cross-section, and the front end surface (A4) of the piston is used to fixedly connect the first friction plate (14), on the rear end surface (B4) of the piston. A first cylindrical roller support (10), a second cylindrical roller support (19), a third cylindrical roller support (45), and a fourth cylindrical roller support (47) are fixedly connected; the first cylindrical roller Both ends of the roller (20) are respectively supported by bearings between the first cylindrical roller support (10) and the second cylindrical roller support (19); both ends of the second cylindrical roller (46) are supported by bearings respectively Between the third cylindrical roller support (45) and the fourth cylindrical roller support (47); the central axes of the first cylindrical roller (20) and the second cylindrical roller (46) are parallel to each other, and both Parallel to the rear end face of the piston (B4).

When the braking force is not 0, as shown in Fig. 20, the first cylindrical roller (20) is always in contact with the first inclined surface (B3) of the booster block, and the second cylindrical roller (46) is always in contact with the second inclined surface of the booster block. (C3) Contact; during the entire movement process, the two contact lines are parallel to each other and perpendicular to the central axis of the circular through hole (44), and the plane where the two contact lines lie is perpendicular to the central axis of the piston (11).

As shown in Figures 21 to 26, the bracket is composed of a first bracket arm (50), a brake caliper limit bar (16), a second bracket arm (51) and a bracket fixing bar (54). The first bracket arm (50) ), the brake caliper limit bar (16) and the second bracket arm (51) are all cuboid structures.

As shown in Figures 21-22, the first bracket arm (50) is provided with a bracket first mounting screw hole (49) in the length direction, and the center axis of the bracket first mounting screw hole (49) is perpendicular to the first bracket arm Front end surface (G6); a second bracket mounting threaded hole (52) is provided in the length direction of the second bracket arm (51), and the center axis of the bracket second mounting threaded hole (52) is perpendicular to the front end surface of the second bracket arm (D6); the first bracket arm (50) is fixedly connected with the brake caliper limit surface (A6) of the brake caliper limit crossbar (16) through the end surface opposite to the front end surface (G6) of the first bracket arm; The second bracket arm (51) is fixedly connected to the brake caliper limit surface (A6) of the brake caliper limit crossbar (16) through the end surface opposite to the front end surface (D6) of the second bracket arm; the second bracket arm (51) ) is located on the left end surface (B6) side of the brake caliper limit crossbar, and the first bracket arm (50) is located at the end opposite to the end surface (B6); the three form a U-shaped bracket; the bracket fixing crossbar (54) is U Type structure, on its front end surface (I6) symmetrically provided with a first bracket hub fixing threaded hole (53) and a second bracket hub fixing threaded hole (55) whose central axis is perpendicular to the front end surface (I6), can pass through the first bracket hub fixing threaded hole (55) The bracket hub fixing threaded hole (53) and the second bracket hub fixing threaded hole (55) and the bolt are fixedly connected with the hub; the second bracket arm (51) is connected to the first bracket through the end face opposite to the upper end face (C6) of the second bracket arm. The upper end surface (E6) of the bracket fixing crossbar is fixedly connected; the first bracket arm (50) is fixedly connected with the upper end surface (F6) of the second bracket fixing crossbar through the end surface opposite to the upper end surface (H6) of the first bracket arm; after installation The bracket is shown in Figure 21.

As shown in Figures 6 and 24-25, the first support rod connecting hole (32) corresponds to the second mounting threaded hole (52) of the bracket, and is fixedly connected to the actuator housing through the second fixing bolt (57) of the bracket; The support rod connecting hole (36) corresponds to the first mounting screw hole (49) of the bracket, and is fixedly connected to the actuator housing through the first fixing bolt (56) of the bracket.

The working principle of a one-way booster type electromechanical brake actuator based on a rotating motor and a rack and pinion proposed by the present invention is as follows:

The process of applying the brake and adjusting the braking force is as follows:

When the driver steps on the brake pedal, the motor (1) is energized, the motor shaft (2) rotates, and the flat key (21) drives the gear (22) to rotate, and the gear (22) drives the rack (7) and the booster block (8) Move, the booster block (8) can translate left and right under the limit support of the cylindrical guide rail (9). When the booster block (8) translates to the right, the corresponding first cylindrical roller (20) and The second cylindrical roller (46) pushes the piston (11) to move, and under the limiting action of the first piston mounting through hole (33) and the second piston mounting through hole (39), the piston (11) can only move forward , thereby pushing the first friction plate (14) to press the brake disc (18), when the first friction plate (14) is in contact with the brake disc (18), the entire actuator is applied to The brake disc (18) moves to the motor side under the reaction of the positive pressure, so that the second friction plate (17) is pressed against the brake disc (18), and finally passes through the first friction plate (14) and the second friction plate (17). ) applies braking force to the brake disc.

In the process of applying the brake, the driver controls the magnitude of the motor torque output by the motor (1) through the opening of the brake pedal, so that the magnitude of the braking force can be adjusted.

The procedure for releasing the brake is as follows:

When the driver releases the brake pedal, the motor (1) is energized, the motor shaft (2) rotates, and the flat key (21) drives the gear (22) to rotate, and the gear (22) drives the rack (7) and the booster block (8) Move, the booster block (8) can translate left and right under the support of the cylindrical guide rail (9). The two inclined planes (C3) are both translated to the left, correspondingly reducing the pressure applied to the piston (11) through the first cylindrical roller (20) and the second cylindrical roller (46), that is, the pressure applied to the brake disc is reduced , when the pressure applied by the motor (1) to the piston (11) is reduced to 0, under the rotating motion of the brake disc, the first friction plate (14) and the second friction plate (17) are completely separated from the brake disc (18) ), the brake pressure applied to the brake disc is reduced to 0.

Claims (2)

1. a one-way force-enhancing electromechanical brake actuator based on a rotating motor and a rack and pinion, is characterized in that: mainly consists of a motor, an installation base, a transmission force-enhancing mechanism; The motor (1) is a rotary motor; The front part of the motor shaft (2) is a gear installation shaft (23), the gear installation shaft (23) is provided with a first keyway (24), the central axis of the motor shaft (2) and the central axis of the gear installation shaft (23) Coincidentally, the diameter of the gear installation shaft (23) is smaller than the diameter of the motor shaft (2), and the boss formed by the gear installation shaft (23) and the motor shaft (2) is used for the axial positioning of the gear (22); the installation base It includes the end cover (4), the actuator shell and the bracket; after the motor shaft (2) passes through the motor shaft through hole (28) on the end cover (4), it passes through the flat key (21), the first keyway (24), the first The two key grooves (26) are matched and connected with the central hole (27) of the gear (22); The actuator housing comprises a booster mechanism housing (6) and a brake caliper (15); the booster mechanism housing (6) is a cylindrical structure; the inner end face (B1) of the booster mechanism housing is provided with a first A piston installation through hole (33); a first cylindrical guide rail support (34) and a second cylindrical guide rail are fixedly installed on both sides of the first piston installation through hole (33) on the inner end face (B1) of the booster mechanism housing The support (39), the cylindrical guide rail (9) is fixedly installed between the first cylindrical guide rail support (34) and the second cylindrical guide rail support (39); The upper end face is perpendicular to the central axis of the motor shaft (2); The brake caliper (15) is a left-right symmetrical structure, and a second piston installation through hole (38) is arranged in the middle; The rear end surface (A2) of the brake caliper is fixedly connected with the front end surface (C1) of the booster housing; The central axis of the second piston installation through hole (38) on the brake caliper (15) coincides with the central axis of the first piston installation through hole (33) of the booster mechanism housing (6) and has the same radius; The transmission force-enhancing mechanism includes a rack (7), a force-enhancing block (8), a piston (11), a gear (22), a first cylindrical roller (20) and a second cylindrical roller (46); The upper and lower end faces of the booster block (8) are parallel to each other, and each side is perpendicular to its upper and lower end faces; the left end face (A3) of the booster block is provided with a circular through hole (44) whose central axis is perpendicular to the end face, and a cylindrical guide rail (9). ) through the circular through hole (44), the booster block (8) can move axially along the cylindrical guide rail (9), the first slope (B3) of the booster block and the second slope (C3) of the booster block are located at the On the same side of the block (8), there are two inclined planes with the same shape, the two are parallel to each other, and the inclined planes are perpendicular to the upper and lower end faces; The rack (7) is fixed on the lower end face of the booster block (8), the teeth of the rack (7) are perpendicular to the central axis of the cylindrical guide rail (9) and the circular through hole (44); the gear (22) and the rack (7) Matching connection; The main body of the piston (11) has a circular structure with a rectangular cross-section. The front end surface (A4) of the piston is used for fixedly connecting the first friction plate (14), and the rear end surface (B4) of the piston is fixedly connected with a first cylindrical roller. The support (10), the second cylindrical roller support (19), the third cylindrical roller support (45), the fourth cylindrical roller support (47); the two ends of the first cylindrical roller (20) are respectively It is supported between the first cylindrical roller support (10) and the second cylindrical roller support (19) through bearings; the two ends of the second cylindrical roller (46) are respectively supported on the third cylindrical roller support through bearings. (45) and the fourth cylindrical roller support (47); the central axes of the first cylindrical roller (20) and the second cylindrical roller (46) are parallel to each other, and both are parallel to the rear end face of the piston (B4) ; When the braking force is not 0, the first cylindrical roller (20) is always in contact with the first inclined surface (B3) of the force increasing block, and the second cylindrical roller (46) is always in contact with the second inclined surface (C3) of the force increasing block; During the whole movement process, the two contact lines are parallel to each other and perpendicular to the central axis of the circular through hole (44), and the plane where the two contact lines are located is perpendicular to the central axis of the piston (11). 2. A one-way booster type electromechanical brake actuator based on a rotary motor and a rack and pinion according to claim 1, characterized in that: on the second piston mounting through hole (38), along the first The friction plate (14) is provided with a first annular groove (40) and a second annular groove (41) in order in the direction of the booster mechanism housing (6), and the first annular groove (40) is used for installing the dust ring ( 13), the second annular groove (41) is used to install the sealing ring (12).

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