CN110701221A - Two-way synchronous reinforcement type electromechanical brake actuator based on linear motor - Google Patents

Abstract

The invention provides a bidirectional reinforcement type electromechanical brake actuator based on a linear motor, which is applied to an automobile and belongs to the technical field of automobile braking; the device comprises a motor, an installation base body, a two-stage force increasing mechanism and a lever force increasing mechanism; the brake caliper adopts a split structure; the motor is a linear motor; the rectangular through groove at the top of the first-stage boosting block and the lug at the bottom of the second-stage boosting block form first-stage boosting; the first inclined surface of the second-stage force-increasing block and the second inclined surface of the second-stage force-increasing block are respectively contacted with the first cylindrical roller and the second cylindrical roller to form second-stage force increase; one end of the lever is hinged with one end of the connecting rod, the other end of the connecting rod is hinged with the rotating pin on the front brake caliper body, the first lever push shaft and the second lever push shaft are respectively arranged in the U-shaped groove at the other end of the lever, and the lever shaft penetrates through the lever shaft mounting through hole.

Description

A Bidirectional Synchronous Force-Boosting Electromechanical Brake Actuator Based on Linear Motor

technical field

The invention belongs to the technical field of automobile braking, and in particular relates to a bidirectional synchronous force-increasing electronic mechanical brake actuator based on a linear motor.

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. On the basis of previous research, a new structure of electro-mechanical brake actuator is proposed. The electro-mechanical brake actuator can realize bidirectional synchronous force increase, and the linear motor is used as the power source, which can effectively reduce the electro-mechanical brake actuator. The volume, especially the compact vehicle with little space for brake system installation.

SUMMARY OF THE INVENTION

The invention provides a bidirectional synchronous force-enhancing electromechanical brake actuator based on a linear motor, which is characterized in that it is mainly composed of a motor, a mounting base, a double-stage force-enhancing mechanism and a lever-enhancing mechanism.

The motor (1) is a linear motor, and the motor shaft (2) is provided with an external thread.

The mounting base includes an end cover (4), an actuator housing and a bracket.

The actuator housing includes a booster mechanism housing (6), a rear brake caliper body (14), a first-level booster block support seat (27), a first arc guide rail (42) and a second arc guide rail (43) .

The booster mechanism housing (6) has a cylindrical structure, and a first piston installation through hole (35) is provided on the inner end surface (D2) of the booster mechanism housing.

A square through hole (41) is provided on the upper end surface (B2) of the housing of the booster mechanism, and the two planes of the square through hole (41) are parallel to the motor shaft (2); 2) A first lever shaft mounting hole (48) and a second lever shaft mounting hole (49) are respectively provided on two parallel planes; the lever shaft (8) is fixed on the first lever shaft mounting hole (48) and the second lever shaft mounting hole (48) and the second lever shaft mounting hole (49) In the middle of the lever shaft mounting hole (49), the lever shaft (8) is parallel to the upper end face (B2) of the booster mechanism housing and the upper end face of the primary booster block (24), and perpendicular to the central axis of the motor shaft (2).

A first cylindrical guide rail support (37) and a second cylindrical guide rail support (50) are fixedly mounted on both sides of the first piston installation through hole (35) on the inner end face (D2) of the booster mechanism housing, and the first cylindrical guide rail support (37) A cylindrical guide rail (25) is fixedly installed between the guide rail support (37) and the second cylindrical guide rail support (50), and the cylindrical guide rail (25) is parallel to the lever shaft (8); A first-level booster block support seat (27) is fixedly installed at the bottom of the first-level booster block support seat (27), and a semicircular guide groove (36) is provided on the top of the first-level booster block support seat (27).

The rear brake caliper body (14) has a left-right symmetrical structure, and a second piston installation through hole (46) is arranged in the middle; on the second piston installation through hole (46), the force boosting mechanism is directed along the first friction plate (15). In the direction of the housing (6), a first annular groove (44) and a second annular groove (45) are sequentially provided, the first annular groove (44) is used for installing the dust ring (12), and the second annular groove ( 45) It is used to install the sealing ring (11); the front end surface (A1) of the rear brake caliper body is symmetrically and fixedly installed with the first arc guide rail (42) and the second arc guide rail (43); The end surface (B1) is fixedly connected with the front end surface (A2) of the casing of the booster mechanism.

The first piston mounting through hole (35) of the booster mechanism housing (6) coincides with the central axis of the second piston mounting through hole (46) on the rear brake caliper body (14) and has the same radius.

A first support rod (33) and a second support rod (40) are symmetrically arranged on the left and right sides of the rear brake caliper body (14), and the first support rod (33) is provided with a first support rod connection hole (34) , the second support rod (40) is provided with a second support rod connecting hole (39).

The double-stage force-increasing mechanism includes a first-stage force-increasing block (24), a second-stage force-increasing block (26), a piston (13), a first cylindrical roller (23) and a second cylindrical roller (62).

The primary booster block (24) has a square structure, the front end face (A3) of the primary booster block is provided with a first threaded hole (28) whose axis is perpendicular to the plane, and the motor shaft (2) passes through the end cover (4). ), the motor shaft through hole (30) on the motor shaft (2) is matched with the inner thread on the first threaded hole (28) through the external thread on the motor shaft (2), and is perpendicular to the front end face (A3) of the first-level force booster. The left and right sides of the device are respectively provided with a first lever push shaft (52), a first lever push shaft fixed limit rod (53), a second lever push shaft (55), and a second lever push shaft fixed limit rod (56), The four are all cylindrical structures and their central axes coincide with each other. The radius of the first lever push shaft (52) and the second lever push shaft (55) are equal, and the first lever push shaft fixes the limit rod (53) and the second lever. The radius of the push shaft fixing limit rod (56) is larger than that of the first lever push shaft (52) and the second lever push shaft (55); a semi-cylindrical semi-circular guide rail (57) is provided at the bottom of the first-stage force booster block (24). ), the semi-circular guide rail (57) is matched with the semi-circular guide groove (36) on the first-level booster support seat (27), and the first-level booster support seat (27) is used to support the first-level booster block (24) , and play a motion guiding role; the top of the first-level force-enhancing block (24) is provided with more than two rectangular through grooves (54), and the bottom of the rectangular through-groove (54) is parallel to the bottom of the first-level force-enhancing block (24). On the upper and lower planes, the longitudinal symmetry lines of each groove are parallel to each other, and the symmetry center line in the longitudinal direction forms an angle α with the motor axis, and α is also the angle between the piston axis A6 and the groove center line B6.

The upper and lower end surfaces of the second-level force increasing block (26) are parallel to each other, and each side surface is perpendicular to its upper and lower end surfaces. (54) Equal and one-to-one corresponding bumps (59), each bump (59) is embedded in the corresponding rectangular through groove (54), and can move back and forth in the rectangular through groove (54), two A circular through hole (58) whose axis is perpendicular to the end face is provided on the left end face (A4) of the first-stage force intensifying block, the cylindrical guide rail (25) passes through the circular through-hole (58), and the second-stage force-enhancing block (26) can be Moving axially along the cylindrical guide rail (25), the first inclined surface (B4) of the secondary force intensifier block and the second inclined surface (C4) of the secondary force intensifier block are respectively connected with the first cylindrical roller (23) and the second cylindrical roller ( 62) Contact, the first inclined surface (B4) of the second-level force increasing block and the second inclined surface (C4) of the second-level force increasing block are two inclined surfaces with the same shape, which are parallel to each other and perpendicular to the second-level force increasing block (26). ), the two inclined planes form an angle β with the center line of the motor, and the angle β is also the angle between the inclined planes B4, C4 and the piston axis A6.

The main body of the piston (13) is a circular structure with a rectangular cross section. The front end surface (A5) of the piston is used for fixedly connecting the first friction plate (15), and the rear end surface (B5) of the piston is fixedly connected with a first cylindrical roller. The support (21), the second cylindrical roller support (22), the third cylindrical roller support (60), the fourth cylindrical roller support (61); the two ends of the first cylindrical roller (23) are respectively It is supported between the first cylindrical roller support (21) and the second cylindrical roller support (22) through bearings; the two ends of the second cylindrical roller (62) are respectively supported on the third cylindrical roller support through bearings. (60) and the fourth cylindrical roller support (61); the axes of the first cylindrical roller (23) and the second cylindrical roller (62) are parallel to each other, and both are parallel to the rear end surface of the piston (B5).

When the braking force is not 0, the first cylindrical roller (23) is in contact with the first inclined surface (B4) of the secondary force intensifier, and the second cylindrical roller (62) is in contact with the second inclined surface (B4) of the secondary force intensifier. C4) contact, 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 (58), the plane where the two contact lines are located is perpendicular to the motor axis, and parallel to the secondary The plane opposite to the first inclined surface (B4) of the force intensifying block and the second inclined surface (C4) of the secondary force intensifying block.

The lever boosting mechanism includes a lever (7), a lever shaft (8), a lever connecting rod rotating pin (9) and a connecting rod (10).

The lever (7) has three connecting ends, which are a connecting rod connecting end (64), a first lever pushing shaft connecting end (68), and a second lever pushing shaft connecting end (70). The lever (7) is Y-shaped left-right symmetrical Structure, the first lever push shaft connection end (68) and the second lever push shaft connection end (70) are on both sides of the left and right symmetry plane, and are symmetrical to each other, the inner side of the first lever push shaft connection end (68) and the second lever push The distance between the inner sides of the shaft connecting ends (70) is equal to the distance between the outer end face of the first lever push shaft fixed limit rod (53) and the outer end face of the second lever push shaft fixed limit rod (56); the connecting rod connecting end (64) is located on the left-right symmetrical plane of the lever (7); the end of the connecting rod connecting end (64) is sequentially provided with a first lever connecting rod rotating pin installation through hole (65) and a lever shaft installation through hole (66) from the outside to the inside ); the end of the first lever push shaft connection end (68) is provided with a first lever push shaft installation U-shaped groove (67); the end of the second lever push shaft connection end (70) is provided with a second lever push shaft installation U-shaped groove (67); A groove (69); the first lever push shaft (52) is placed in the first lever push shaft installation U-shaped groove (67), and can move back and forth along the first lever push shaft installation U-shaped groove (67), and the second lever push shaft is installed in the U-shaped groove (67). The lever push shaft (55) is placed in the second lever push shaft installation U-shaped groove (69), and can move back and forth along the second lever push shaft installation U-shaped groove (69); the lever shaft (8) is installed through the lever shaft Through the hole (66), the lever (7) rotates around the lever shaft (8).

The connecting rod (10) has four connecting ends, the connecting rod (10) is a Y-shaped left-right symmetrical structure, the first lever connecting end (73) and the second lever connecting end (76) are at one end, and the first lever connecting end (73) ) and the second lever connecting end (76) are parallel to each other, and there is a groove (75) between them, and the distance between the inner end faces of the groove (75) is equal to the length of the first lever connecting rod rotating pin installation through hole (65), The first lever connecting end (73) is provided with a second lever connecting rod rotating pin mounting through hole (74), and the second lever connecting end (76) is provided with a third lever connecting rod rotating pin mounting through hole (77), The central axis of the second lever link rotation pin installation through hole (74) and the third lever link rotation pin installation through hole (77) coincide with each other; the first front brake caliper body connecting end (72) and the second front brake The connecting end (78) of the caliper body is located on the other side of the connecting rod (10). The end of the connecting end (78) of the brake caliper body is provided with a second connecting rod rotating pin mounting through hole (79).

The lever link rotation pin (9) passes through the second lever link rotation pin installation through hole (74), the first lever link rotation pin installation through hole (65), and the third lever link rotation pin installation through hole ( 77), thereby realizing the hinged connection of the lever (7) and the connecting rod (10).

The front brake caliper body (18) has a left-right symmetrical structure; the side cross section is an inverted L shape; the front brake caliper body (18) includes a first front brake caliper body support (16), a second front brake caliper body support The seat (82), the first arc groove (85), the second arc groove (86), the friction plate support plate (87), the friction plate support plate (87) is located on the front brake caliper body (18). The lower part and the middle are U-shaped grooves for fixed installation of the second friction plate (17). The upper part of the front brake caliper body (18) is provided with a first arc groove (85) and a second arc groove (86). ), the first circular arc groove (85) and the second circular arc groove (86) are in a symmetrical relationship with respect to the left and right central symmetry planes of the front brake caliper body (18), and the second circular arc guide rail (43) is placed on the In an arc groove (85), the shape and size of the second arc guide (43) are the same as those of the first arc groove (85), and the second arc guide (43) can only be concave along the first arc The groove (85) is free to move back and forth; after installation, the first circular arc guide rail (42) is placed in the second circular arc groove (86), and the shape and size of the first circular arc guide rail (42) are the same as those of the second circular arc groove (86). The grooves (86) are the same, and the first arc guide rail (42) can only move freely forward and backward along the second arc groove (86); the first front brake caliper body support (16) and the second front brake caliper body The support (82) is fixedly installed on the top of the front brake caliper body (18), and the first front brake caliper body support (16) and the second front brake caliper body support (82) are opposite to the front brake caliper body The left and right central symmetrical planes of (18) are in a symmetrical relationship, and the first front brake caliper body support (16) is fixedly installed above the second arc groove (86), with a U-shaped groove in the middle and two sides of the U-shaped groove. A first rotating pin mounting hole (80) and a second rotating pin mounting hole (81) are respectively provided, and the central axes of the first rotating pin mounting hole (80) and the second rotating pin mounting hole (81) coincide with each other; The front brake piping support (82) is fixed on the top of the first arc groove (85), and the middle is a U -shaped groove. There are third rotated sales holes (83) and first on both sides of the U -shaped groove. Four rotating pin mounting holes (84), the central axes of the third rotating pin mounting hole (83) and the fourth rotating pin mounting hole (84) coincide with each other.

The first rotating pin (90) is installed between the first rotating pin mounting hole (80) and the second rotating pin mounting hole (81) through the first bearing (88) and the second bearing (89), and the first front brake The first connecting rod rotating pin mounting hole (71) on the connecting end (72) of the clamp body is matched and connected with the first rotating pin (90); the second rotating pin (91) passes through the third bearing (92) and the fourth bearing ( 93) Installed between the third rotating pin mounting hole (83) and the fourth rotating pin mounting hole (84), the second connecting rod rotating pin mounting hole (79) on the connecting end (78) of the second front brake caliper body ) is matched with the second rotating pin (91).

Compared with the traditional braking system solution: this solution can realize all the functions of traditional braking through linear motors and related transmission systems, and can realize active braking, thus decoupling traditional vehicle braking systems and new energy vehicles Provide solutions for braking energy recovery and intelligent driving vehicle braking system.

Compared with the existing electro-mechanical brake actuator: this scheme is a brand new mechanism, which adopts a brake caliper body with a split structure, a double-stage booster mechanism and a lever booster mechanism, which is a brand-new structure. form; under the same volume, the force-enhancing effect of this scheme is greater, and the volume of this scheme is smaller when the required braking force is the same; in addition, this scheme uses a linear motor as a brake actuator, which can effectively reduce The volume of the electromechanical brake actuator can effectively solve the problem of the small installation space of the electromechanical brake system of the compact vehicle.

Description of drawings

Figure 1 is an assembly diagram of a bidirectional booster electromechanical brake actuator based on a linear motor.

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

Figure 3 is a right side view of the end cap (4).

FIG. 4 is the three-dimensional structure diagram 1 of the actuator housing.

FIG. 5 is a sectional view 1 of the actuator housing.

Fig. 6 is a sectional view 2 of the actuator housing (separated state).

Figure 7 is a left side view of the actuator housing (direction A).

Figure 8 is a right side view of the actuator housing (direction B).

Fig. 9 is a sectional view of the actuator housing taken along C-C.

Figure 10 is a three-dimensional structure of the actuator housing Figure 2 .

Figure 11 is an exploded view of the actuator housing.

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

Fig. 13 is a three-dimensional structural diagram of the first-stage force-enhancing block (24) of the two-stage force-enhancing mechanism.

Fig. 14 is a front view of the first-stage force-enhancing block (24) of the two-stage force-enhancing mechanism.

Fig. 15 is a top view of the first-stage force-enhancing block (24) of the two-stage force-enhancing mechanism.

Fig. 16 is a three-dimensional structural diagram of the second-stage force-enhancing block (26) of the two-stage force-enhancing mechanism.

Fig. 17 is a top view of the second-stage power-enhancing block (26) of the two-stage power-enhancing mechanism.

Fig. 18 is a side view of the second-stage power-enhancing block (26) of the two-stage power-enhancing mechanism.

Fig. 19 is a bottom view of the second-stage power-enhancing block (26) of the two-stage power-enhancing mechanism.

Fig. 20 is a three-dimensional structural diagram of the piston (13) of the two-stage booster mechanism.

Figure 21 is a side view of the piston (13) of the dual-stage booster mechanism.

Figure 22 is a front view of the piston (13) of the double-stage booster mechanism.

FIG. 23 is a schematic diagram of the principle of boosting of the double-stage boosting mechanism.

Figure 24 is a three-dimensional structural diagram of the lever (7) of the lever booster mechanism.

Figure 25 is a three-dimensional structural diagram of the lever (10) of the lever booster mechanism.

Figure 26 is a front view of the front brake caliper body (18) of the lever booster mechanism.

Figure 27 is a three-dimensional structural view of the front brake caliper body (18) of the lever booster mechanism.

Fig. 28 is a cross-sectional view of the front brake caliper body taken along the line A-A.

Figure 29 is a schematic diagram of the installation of the rotating pin.

Figure 30 is a three-dimensional view of an electromechanical brake actuator.

Figure 31 is a three-dimensional view of the internal structure of the electromechanical brake actuator.

Figure 32 is an exploded view of the three-dimensional structure of the stent.

Figure 33 is a three-dimensional structural diagram of the stent.

Figure 34 is a front view of the bracket.

Figure 35 is a top view of the bracket.

Figure 36 is a top view of the bracket installation.

In the figure: 1. Motor; 2. Motor shaft; 3. Motor fixing bolts; 4. End cover; 5. End cover fixing bolts; 6. Housing of booster mechanism; 7. Lever; 8. Lever shaft; 9. Lever Connecting rod rotation pin; 10, connecting rod; 11, sealing ring; 12, dust ring; 13, piston; 14, rear brake caliper body; 15, first friction plate; 16, first front brake caliper body support seat; 17, the second friction plate; 18, the front brake caliper body; 19, the brake caliper body limit bar; 20, the brake disc; 21, the first cylindrical roller support; 22, the second cylindrical roller Sub-support; 23. The first cylindrical roller; 24. The first-level reinforced block; 25. Cylindrical guide rail; 26. The second-level reinforced block; 27. The first-level reinforced block support seat; 29. The first motor fixing screw hole; 30, the motor shaft through hole; 31, the second motor fixing screw hole; 32, the first end cover fixing screw hole; 33, the first support rod; 34, the first support rod connection hole 35, the first piston installation through hole; 36, the semicircular guide groove; 37, the first cylindrical guide rail support; 38, the second end cap fixing threaded hole; 39, the second support rod connection hole; 40, the second support rod 41, square through hole; 42, first arc guide rail; 43, second arc guide rail; 44, first annular groove; 45, second annular groove; 46, second piston installation through hole; 47, second Cylindrical guide rail mounting hole; 48, first lever shaft mounting hole; 49, second lever shaft mounting hole; 50, second cylindrical guide rail support; 51, first cylindrical guide rail mounting hole; 52, first lever push shaft; 53 , the first lever push shaft fixed limit rod; 54, the rectangular through groove; 55, the second lever push shaft; 56, the second lever push shaft fixed limit rod; 57, semicircular guide rail; 58, circular through hole; 59, the bump; 60, the third cylindrical roller support; 61, the fourth cylindrical roller support; 62, the second cylindrical roller; 63, the center hole of the piston; 64, the connecting end of the connecting rod; 65, the first 66. Lever shaft installation through hole; 67, first lever push shaft installation U-shaped groove; 68, first lever push shaft connection end; 69, second lever push shaft installation U-shaped groove ; 70, the connecting end of the second lever push shaft; 71, the installation hole of the first connecting rod rotating pin; 72, the connecting end of the first front brake caliper body; 73, the connecting end of the first lever; 74, the second lever connecting rod rotates Pin installation through hole; 75, slot; 76, second lever connection end; 77, third lever link rotation pin installation through hole; 78, second front brake caliper body connection end; 79, second link rotation pin Mounting hole; 80, first pivot pin mounting hole; 81, second pivot pin mounting hole; 82, second front brake caliper body support; 83, third pivot pin mounting hole; 84, fourth pivot pin mounting hole 85, the first arc groove; 86, the second arc groove; 87, the friction plate support plate; 88, the first bearing; 89, the second bearing; 90, the first rotation pin; 91, the second rotation pin; 92, the third bearing; 93, the fourth bearing; 94, the first mounting threaded hole of the bracket; 95, the first bracket arm; 96, the first Two bracket arms; 97, the second mounting threaded hole of the bracket; 98, the first bracket wheel hub fixing threaded hole; 99, the bracket fixing cross bar; 100, the second bracket wheel hub fixing threaded hole; 101, the first bracket fixing bolt; 102, The second fixing bolt of the bracket.

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

In Figures 4 to 12: A1, the front end surface of the rear brake caliper body; B1, the rear end surface of the rear brake caliper body; A2, the front end surface of the booster mechanism shell; B2, the upper end surface of the booster mechanism shell; C2, the booster mechanism The rear end face of the mechanism shell; D2, the inner end face of the booster mechanism shell.

In Fig. 13: A3, the front end face of the first-level force intensifier block.

In Figures 16 to 19 and 23: A4, the left end face of the secondary force intensifying block; B4, the first inclined surface of the secondary force intensifying block; C4, the second inclined surface of the secondary force intensifying block.

In Figures 20 to 21: A5, the front end face of the piston; B5, the rear end face of the piston.

In Fig. 23: A6, the center axis of the piston; B6, the center line of the groove; α, the angle between the center axis A6 of the piston and the center line B6 of the groove; β, the angle between the inclined planes B4, C4 and the center axis A6 of the piston.

In Figure 32: A7, the limit surface of the brake caliper body; B7, the left end surface of the brake caliper body limit cross bar; C7, the upper end surface of the second bracket arm; D7, the front end surface of the second bracket arm; E7, the first bracket Fix the upper end face of the cross bar; F7, the second bracket fixes the upper end face of the cross bar; G7, the front end face of the first bracket arm; H7, the upper end face of the first bracket arm; I7, the bracket fixes the front end face of the cross bar.

specific implementation

The present invention provides a bidirectional synchronous force-enhancing electromechanical brake actuator based on a linear motor. In order to make the technical solutions and effects of the present invention clearer and clearer, the present invention will be further described in detail with reference to the accompanying drawings and examples; it should be understood that this The specific implementations described herein are only used to explain the present invention, but not to limit the present invention.

A bidirectional synchronous force-enhancing electromechanical brake actuator based on a linear motor is mainly composed of a mounting base, a motor, a two-stage force-enhancing mechanism, and a lever-enhancing mechanism.

The motor (1) is a linear motor, and the motor shaft (2) has external threads.

As shown in Figure 1-2, the boss at the end of the motor (1) is provided with eight first motor fixing screw holes (29), the first motor fixing screw holes (29) are used to fix the motor, and the number is not limited to 8.

As shown in Figure 1, the mounting base includes an end cover (4), an actuator housing and a bracket.

As shown in Figures 1 and 3, the end cover (4) is provided with one motor shaft through hole (30), eight second motor fixing screw holes (31), and 13 first end cover fixing screw holes (32). ; The second motor fixing threaded hole (31) corresponds to the first motor fixing threaded hole (29) one by one, mainly for fixing the motor, the number is not limited to 8, and can be increased or decreased according to the actual installation situation; the first end cover fixing thread The holes (32) are used for fixing the end caps, and the number is not limited to 13, which can be increased or decreased according to the actual installation situation.

As shown in Figures 1 and 4-12, the actuator housing includes a booster mechanism housing (6), a rear brake caliper body (14), a first-level booster block support seat (27), and a first arc guide rail (42). ) and the second arc guide rail (43).

As shown in Figure 4, the booster mechanism housing (6) is a cylindrical structure, and the rear end surface (C2) of the booster mechanism housing is provided with a second end cap which is matched with the fixing screw hole (32) of the first end cap The fixed threaded holes (38) have the same number and one-to-one correspondence.

As shown in Figures 4-6, a first piston mounting through hole (35) is provided on the inner end face (D2) of the booster mechanism housing.

As shown in Figures 1, 4-6, and 9, a square through hole (41) is provided on the upper end surface (B2) of the booster mechanism housing, and the two sides of the square through hole (41) are parallel to the motor shaft (2); As shown in Figure 9, a first lever shaft mounting hole (48) and a second lever shaft mounting hole (49) are provided on two planes parallel to the motor shaft (2) in the square through hole (41); the lever shaft (8) is fixed between the first lever shaft mounting hole (48) and the second lever shaft mounting hole (49), the lever shaft (8) is parallel to the upper end surface (B2) of the booster mechanism housing, and perpendicular to the motor shaft (2) the central axis.

As shown in Figures 4-5, 8-9, and 12, on both sides of the first piston mounting through hole (35) on the inner end face (D2) of the booster mechanism housing, the first cylindrical guide rail support (37) and the first cylindrical guide rail support (37) and the first piston mounting through hole (35) are fixedly installed on both sides. Two cylindrical guide rail supports (50), a cylindrical guide rail (25) is fixedly installed between the first cylindrical guide rail support (37) and the second cylindrical guide rail support (50), the cylindrical guide rail (25) is parallel to the lever axis (8) ); a first-level booster block support seat (27) is fixedly installed at the bottom of the inner side of the booster mechanism housing (6), and a semicircular guide groove (36) is provided on the top of the first-level booster block support seat (27).

As shown in FIG. 7 , the rear brake caliper body (14) has a left-right symmetrical structure, and a second piston installation through hole (46) is provided in the middle.

As shown in Figure 5-6, on the second piston installation through hole (46), along the direction of the first friction plate (15) to the booster mechanism housing (6), a first annular groove (44) is formed in sequence and a second annular groove (45), the first annular groove (44) is used for installing the dust ring (12), and the second annular groove (45) is used for installing the sealing ring (11).

As shown in Figures 5, 7, and 10-11, a first arc guide rail (42) and a second arc guide rail (43) are symmetrically and fixedly mounted on the front end surface (A1) of the rear brake caliper body.

As shown in Figures 5-6 and 10, the rear end surface (B1) of the rear brake caliper body is fixedly connected to the front end surface (A2) of the booster housing.

As shown in Figure 5, the center axis of the first piston mounting through hole (35) of the booster mechanism housing (6) and the second piston mounting through hole (46) on the rear brake caliper body (14) coincide with the center axis and have the same radius .

As shown in Figures 7, 10-12, a first support rod (33) and a second support rod (40) are symmetrically arranged on the left and right sides of the rear brake caliper body (14), and the first support rod (33) is provided with A first support rod connecting hole (34) is provided, and a second support rod connecting hole (39) is provided on the second support rod (40).

As shown in FIG. 1 , the two-stage booster mechanism includes a primary booster block (24), a secondary booster block (26), a piston (13), a first cylindrical roller (23) and a second cylindrical roller ( 62).

As shown in Figures 13-15, the main body of the first-level force intensifier (24) is a cuboid structure, and the front end surface (A3) of the first-level force-enhancer block is provided with a first threaded hole (28) whose axis is perpendicular to the plane; A first lever push shaft (52), a first lever push shaft fixed limit rod (53), a second lever push shaft (55), a second lever push shaft (55), a first lever push shaft (52), a second lever push shaft (55), Two lever push shafts are fixed to limit rods (56), all of which are cylindrical structures and their central axes coincide with each other, the first lever push shaft (52) and the second lever push shaft (55) have equal radii, and the first lever push shaft (55) The radii of the shaft fixing limit rod (53) and the second lever push shaft fixing limit rod (56) are equal, and the radius of the first lever push shaft (52) is smaller than the radius of the first lever push shaft fixing limit rod (53) A semi-cylindrical semi-circular guide rail (57) is provided at the bottom of the first-level force-enhancing block (24), and the semi-circular guide rail (57) is matched with the semi-circular guide groove (36) on the first-level force-enhancing block support seat (27), The first-level booster block support seat (27) is used to support the first-level booster block (24) and play a motion guiding role; the top of the first-level booster block (24) is provided with more than two rectangular through grooves (54) , the bottom of the rectangular through-groove (54) is parallel to the upper and lower planes of the first-level booster block (24), the longitudinal symmetry lines of each groove are parallel to each other, and the symmetry center line in the longitudinal direction forms an angle α with the motor axis, α is also the piston The included angle between the axis A6 and the centerline B6 of the groove is shown in FIG. 23 .

As shown in Figures 1, 3 and 13, the motor shaft (2) passes through the motor shaft through hole (30) on the end cover (4), and passes through the external thread on the motor shaft (2) and the first threaded hole (28) The internal thread on the mate connection.

As shown in Figures 16-19, the upper and lower end surfaces of the second-level force intensifying block (26) are parallel to each other, and each side surface is perpendicular to its upper and lower end surfaces. (24) The top rectangular through-grooves (54) are equal, and the positions are one-to-one with corresponding bumps (59). (54) moves back and forth, the left end face (A4) of the secondary booster block is provided with a circular through hole (58) whose axis is perpendicular to the end face, and the cylindrical guide rail (25) passes through the circular through hole (58), and two The first sloping surface (B4) of the second-stage energizing block and the second sloping surface (C4) of the second-stage energizing block and the first cylindrical roller (23) can move axially along the cylindrical guide rail (25). In contact with the second cylindrical roller (62), the first inclined surface (B4) of the second-level force increasing block and the second inclined surface (C4) of the second-level force increasing block are two inclined surfaces with the same shape, which are parallel to each other and the inclined surfaces are vertical. The upper and lower end faces form an angle β with the center line of the motor, and the angle β is also the angle between the inclined planes B4, C4 and the piston axis A6, as shown in Figure 23.

As shown in Figures 20-22, the main body of the piston (13) is a ring-shaped structure with a rectangular cross section. The front end surface (A5) of the piston is used to fixedly connect the first friction plate (15), and is on the rear end surface (B5) of the piston. A first cylindrical roller support (21), a second cylindrical roller support (22), a third cylindrical roller support (60), and a fourth cylindrical roller support (61) are fixedly connected; the first cylindrical roller Both ends of the roller (23) are respectively supported by bearings between the first cylindrical roller support (21) and the second cylindrical roller support (22); both ends of the second cylindrical roller (62) are supported by bearings respectively Between the third cylindrical roller support (60) and the fourth cylindrical roller support (61); the axes of the first cylindrical roller (23) and the second cylindrical roller (62) are parallel to each other, and both are parallel to each other. Piston rear end face (B5) is parallel.

When the braking force is not 0, as shown in Figure 23, the first cylindrical roller (23) is always in contact with the first inclined surface (B4) of the second-level force booster, and the second cylindrical roller (62) is always in contact with the second-level force-enhancing block. The second inclined plane (C4) of the block is in contact. 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 (58), and the plane where the two contact lines are located is perpendicular to the motor axis, and Parallel to the plane opposite to the first inclined surface (B4) of the secondary force intensifier block and the second inclined surface (C4) of the secondary force intensifier block.

As shown in Figures 1, 30-31, the lever boosting mechanism includes a lever (7), a lever shaft (8), a lever link rotation pin (9) and a link (10).

As shown in Figure 24, the lever (7) has three connecting ends, namely the connecting rod connecting end (64), the first lever push shaft connecting end (68), the second lever pushing shaft connecting end (70), and the lever (7) is Y-shaped left and right symmetrical structure, the first lever push shaft connection end (68) and the second lever push shaft connection end (70) are on both sides of the left and right symmetry plane, and are symmetrical with each other, the inner side of the first lever push shaft connection end (68) and The distance between the inner side of the connecting end (70) of the second lever push shaft is equal to the distance between the outer end face of the first lever push shaft fixed limit rod (53) and the outer end face of the second lever push shaft fixed limit rod (56); The connecting end (64) of the connecting rod is located on the left-right symmetrical plane of the lever (7); (66); the end of the first lever push shaft connection end (68) is provided with a first lever push shaft installation U-shaped groove (67); the end of the second lever push shaft connection end (70) is provided with a second lever push shaft Install the U-slot (69).

As shown in Figure 29, the first lever push shaft (52) is placed in the first lever push shaft installation U-shaped groove (67), and can move back and forth along the first lever push shaft installation U-shaped groove (67), and the second lever push shaft The shaft (55) is placed in the second lever push shaft installation U-shaped groove (69), and can move back and forth along the second lever push shaft installation U-shaped groove (69);

As shown in Figures 1 and 29, the lever shaft (8) passes through the lever shaft mounting through hole (66), and the lever (7) rotates around the lever shaft (8).

As shown in Figure 25, the connecting rod (10) has four connecting ends, the connecting rod (10) is a Y-shaped left-right symmetrical structure, the first lever connecting end (73) and the second lever connecting end (76) are at one end, and the first lever connecting end (73) and the second lever connecting end (76) are at one end. A lever connecting end (73) and a second lever connecting end (76) are parallel to each other, and there is a groove (75) between them, and the distance between the inner end faces of the groove (75) is equal to the distance between the first lever connecting rod and the rotating pin. The length of the hole (65), the first lever connecting end (73) is provided with a second lever connecting rod rotating pin mounting through hole (74), and the second lever connecting end (76) is provided with a third lever connecting rod rotating pin The installation through hole (77), the second lever link rotation pin installation through hole (74) and the third lever link rotation pin installation through hole (77) have center axes coincident with each other; the first front brake caliper body connecting end (72) ) and the connecting end (78) of the second front brake caliper body are located on the other side of the connecting rod (10), and the end of the connecting end (72) of the first front brake caliper body is provided with a first connecting rod rotating pin mounting through hole (71), the end of the second front brake caliper body connecting end (78) is provided with a second connecting rod rotating pin mounting through hole (79).

As shown in Figure 31, the lever link rotation pin (9) passes through the second lever link rotation pin installation through hole (74), the first lever link rotation pin installation through hole (65), and the third lever link in sequence The rotation pin is installed in the through hole (77), so as to realize the hinged connection between the lever (7) and the connecting rod (10).

As shown in Figures 26-27 and 29, the front brake caliper body (18) has a left-right symmetrical structure.

It can be seen from Figures 27-28 that the side section is an inverted L shape.

It can be seen from Figures 26 to 29 that the front brake caliper body (18) has a left-right symmetrical structure; Two front brake caliper body supports (82), a first arc groove (85), a second arc groove (86), a friction plate support plate (87), the friction plate support plate (87) is located in the front brake The lower part of the caliper body (18) has a U-shaped groove in the middle for fixedly installing the second friction plate (17); the upper part of the front brake caliper body (18) is provided with a first arc groove (85) and a second Two arc grooves (86), the first arc groove (85) and the second arc groove (86) are in a symmetrical relationship with respect to the left and right central symmetry planes of the front brake caliper body (18); Two arc guide rails (43) are placed in the first arc groove (85), the shape and size of the second arc guide rail (43) are the same as the first arc groove (85), and the second arc guide rail ( 43) It can only move freely forward and backward along the first arc groove (85); after installation, the first arc guide rail (42) is placed in the second arc groove (86), and the first arc guide rail (42) The shape and size are the same as those of the second arc groove (86), the first arc guide rail (42) can only move freely forward and backward along the second arc groove (86); the first front brake caliper body support ( 16) and the second front brake caliper body support (82) are fixedly installed on the top of the front brake caliper body (18), the first front brake caliper body support (16) and the second front brake caliper body support The seat (82) is in a symmetrical relationship with respect to the left and right central symmetry planes of the front brake caliper body (18). The first front brake caliper body support (16) is fixedly installed above the second arc groove (86), and the middle It is a U-shaped groove, and the two sides of the U-shaped groove are respectively provided with a first rotating pin mounting hole (80) and a second rotating pin mounting hole (81), the first rotating pin mounting hole (80) and the second rotating pin mounting hole ( 81) coincide with each other; the second front brake caliper body support (82) is fixedly installed above the first arc groove (85), the middle is a U-shaped groove, and the two sides of the U-shaped groove are respectively provided with a No. The three rotating pin mounting holes (83) and the fourth rotating pin mounting hole (84), the central axes of the third rotating pin mounting hole (83) and the fourth rotating pin mounting hole (84) coincide with each other.

As shown in Figures 26 and 29, the first rotating pin (90) is installed in the first rotating pin mounting hole (80) and the second rotating pin mounting hole (81) through the first bearing (88) and the second bearing (89) In between, the first connecting rod rotating pin mounting hole (71) on the connecting end (72) of the first front brake caliper body is matched and connected with the first rotating pin (90); the second rotating pin (91) passes through the third bearing (92) and the fourth bearing (93) are installed between the third rotating pin mounting hole (83) and the fourth rotating pin mounting hole (84), and the second front brake caliper body connecting end (78) The connecting rod rotating pin mounting hole (79) is connected with the second rotating pin (91).

As shown in Figures 32 to 36, the bracket is composed of a first bracket arm (95), a brake caliper body limit cross bar (19), a second bracket arm (96) and a bracket fixing cross bar (99). The first bracket arm ( 95), the brake caliper body limit cross bar (19) and the second bracket arm (96) are all cuboid structures.

As shown in FIG. 32 , a first mounting screw hole (94) is provided in the length direction of the first support arm (95), and the center axis of the first mounting screw hole (94) of the support is perpendicular to the front end surface of the first support arm (G7); a second mounting screw hole (97) is provided on the length direction of the second support arm (96), and the center axis of the second mounting screw hole (97) of the support is perpendicular to the front end face of the second support arm (D7) ); the first bracket arm (95) is fixedly connected to the brake caliper body limit surface (A7) of the brake caliper body limit crossbar (19) through the end face opposite to the front end surface (G7) of the first bracket arm; The two bracket arms (96) are fixedly connected to the brake caliper body limit surface (A7) of the brake caliper body limit crossbar (19) through the end surface opposite to the front end surface (D7) of the second bracket arm; the second bracket arm (96) is located on the left end face (B7) side of the limit cross bar of the brake caliper body, and the first bracket arm (95) is located at the end opposite to the end face (B7); the three form a U-shaped bracket; the bracket fixes the cross bar (99) ) is a U-shaped structure, and its front end surface (I7) is symmetrically provided with a first bracket hub fixing threaded hole (98) and a second bracket hub fixing threaded hole (100) whose central axis is perpendicular to the front end surface (I7), which can be The first bracket hub fixing threaded hole (98) and the second bracket hub fixing threaded hole (100) and bolts are fixedly connected to the wheel hub; the second bracket arm (96) passes through the end face opposite to the upper end face (C7) of the second bracket arm It is fixedly connected with the upper end surface (E7) of the first bracket fixing cross bar; the first bracket arm (95) is fixedly connected with the upper end surface (F7) of the second bracket fixing cross bar through the end surface opposite to the upper end surface (H7) of the first bracket arm ; After installation, the bracket is shown in Figure 33.

As shown in Figures 7, 30 and 36, the first support rod connecting hole (34) corresponds to the second mounting threaded hole (97) of the bracket, and is fixedly connected to the actuator housing through the second fixing bolt (102) of the bracket; The support rod connecting hole (39) corresponds to the first mounting screw hole (94) of the bracket, and is fixedly connected to the actuator housing through the first fixing bolt (101) of the bracket.

The working principle of the two-way force-enhancing electromechanical brake actuator based on the linear motor 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 depresses the brake pedal, the motor (1) is energized, the motor shaft (2) moves forward, and the first-stage booster block (24) moves forward accordingly. ), the first-level booster block (24) can only move forward and backward in translation, and the rectangular through groove (54) on the first-level booster block (24) passes through the grooves on the second-level booster block (26). The bump (59) pushes the secondary booster block (26) to move, and the secondary booster block (26) cannot move back and forth under the limiting action of the cylindrical guide rail (25), but can only move left and right. When the booster block (24) moves forward, the secondary booster block (26) can only translate to the right, and the first slope (B4) of the second booster block and the second slope (C4) of the second booster block both move toward Right translation, correspondingly push the piston (13) to move through the first cylindrical roller (23) and the second cylindrical roller (62), in the first piston installation through hole (35) and the second piston installation through hole (46) Under the limiting action of the piston (13), the piston (13) can only move forward, thereby pushing the first friction plate (15) to press the brake disc (20) to apply a braking force to the brake disc.

When the motor shaft (2) moves forward after the motor (1) is energized, the first-level booster block (24) moves forward accordingly, and the first lever push shaft (52) and the second lever push shaft (55) move forward accordingly At this time, the first lever push shaft (52) moves back and forth in the first lever push shaft installation U-shaped groove (67), and the second lever push shaft (55) in the second lever push shaft installation U-shaped groove (69) Back and forth movement, correspondingly drives the lever (7) to move, at this time, the lever (7) can only rotate counterclockwise around the lever shaft (8), and the lever (7) drives the lever (10) through the lever connecting pin The second lever link rotation pin installation through hole (74) and the third lever link rotation pin installation through hole (77) rotate counterclockwise around the lever shaft (8), and the second lever link rotation pin installation through hole (74) At the same time, it rotates clockwise around the lever link rotation pin (9) and the third lever link rotation pin installation through hole (77), which makes the first link rotation pin installation hole (71) of the connecting rod (10) and the third The two-link rotating pin mounting hole (79) drives the first rotating pin (90) and the second rotating pin (91) to move toward the motor (1) side, and simultaneously move around the first rotating pin (90) and the second rotating pin respectively. (91) rotates; the first rotating pin (90) and the second rotating pin (91) drive the front brake caliper body (18) to move, and the first arc guide rail (42) on the front brake caliper body (18) and the Under the limiting action of the second arc groove (86) and the first arc groove (85), the second arc guide rail (43) can only follow the first arc groove (85) and the second arc groove (85). The arc groove (86) moves in translation, so the front brake caliper body (18) is driven by the first rotating pin (90) and the second rotating pin (91) to translate toward the brake disc side, thereby driving the second rotating pin (91). The friction plate (17) is pressed against the brake disc (20) to apply the braking force to the brake disc.

In the process of applying the brake, the driver can control the magnitude of the motor force output by the motor (1) through the opening of the brake pedal, so as to realize the adjustment of the magnitude of the braking force.

The procedure for reducing braking is as follows:

When the driver reduces the opening of the brake pedal, the motor (1) is energized, the motor shaft (2) moves backwards, and the first-stage booster block (24) moves backwards accordingly. Under the limiting action of (36), the first-level booster block (24) can only perform translational movement, and the rectangular through groove (54) on the first-level booster block (24) passes through the second-level booster block (26). The convex block (59) pulls the secondary booster block (26) to move, and the secondary booster block (26) cannot move back and forth under the limiting action of the cylindrical guide rail (25), but can only move left and right. When the first-stage power-increasing block (24) moves backwards, the second-stage power-increasing block (26) can only translate to the left. They all translate to the left, and the pressure applied to the piston (13) is correspondingly reduced by the first cylindrical roller (23) and the second cylindrical roller (62), that is, the pressure applied to the brake disc is reduced. When the motor (1) ) After the pressure applied to the piston (13) is reduced to 0, under the rotating motion of the brake disc, the first friction plate (15) is separated from the brake disc (20), and the braking pressure applied to the brake disc is reduced to 0.

When the motor shaft (2) moves backward after the motor (1) is energized, the first-level booster block (24) moves backward accordingly, and the first lever push shaft (52) and the second lever push shaft (55) move backward accordingly At this time, the first lever push shaft (52) moves back and forth in the first lever push shaft installation U-shaped groove (67), and the second lever push shaft (55) in the second lever push shaft installation U-shaped groove (69) The forward and backward movement drives the lever (7) to move accordingly. At this time, the lever (7) can only rotate clockwise around the lever axis (8), and the lever (7) drives the connecting rod (10) through the lever connecting pin (9). The second lever link rotation pin installation through hole (74) and the third lever link rotation pin installation through hole (77) rotate clockwise around the lever shaft (8), and the second lever link rotation pin installation through hole (74) At the same time, it rotates counterclockwise around the lever link rotation pin (9) and the third lever link rotation pin installation through hole (77), which makes the first link rotation pin installation hole (71) of the connecting rod (10) and the third The two-link rotating pin mounting hole (79) drives the first rotating pin (90) and the second rotating pin (91) to move away from the motor (1) side, and simultaneously rotate around the first rotating pin (90) and the second rotating pin (91) respectively. The pin (91) rotates; the first rotating pin (90) and the second rotating pin (91) drive the front brake caliper body (18) to move, and the first circular arc guide rail (42) on the front brake caliper body (18) Under the limiting action of the second arc groove (86) and the first arc groove (85), the second arc guide rail (43) can only move along the first arc groove (85) and the second arc groove (85). The arc groove (86) performs translational movement, so the front brake caliper body (18) is driven by the first rotating pin (90) and the second rotating pin (91) to translate to the side away from the brake disc, thereby driving The second friction plate (17) is disengaged from the brake disc (20); thereby reducing or even canceling the braking force.

Claims (2)

1. a bidirectional synchronous force-enhancing electromechanical brake actuator based on a linear motor, is characterized in that: mainly consists of a motor, a mounting base, a two-stage force-enhancing mechanism, a lever-enhancing mechanism; The motor (1) is a linear motor, and the motor shaft (2) is provided with external threads; The installation base includes an end cover (4), an actuator housing and a bracket; The actuator housing includes a booster mechanism housing (6), a rear brake caliper body (14), a first-level booster block support seat (27), a first circular arc guide rail (42) and a second circular arc guide rail (43); The booster mechanism housing (6) is a cylindrical structure, and a first piston installation through hole (35) is provided on the inner end face (D2) of the booster mechanism housing; A square through hole (41) is provided on the upper end surface (B2) of the housing of the booster mechanism, and the two planes of the square through hole (41) are parallel to the motor shaft (2); 2) A first lever shaft mounting hole (48) and a second lever shaft mounting hole (49) are respectively provided on two parallel planes; the lever shaft (8) is fixed on the first lever shaft mounting hole (48) and the second lever shaft mounting hole (48) and the second lever shaft mounting hole (49) Between the lever shaft mounting holes (49), the lever shaft (8) is parallel to the upper end face (B2) of the booster mechanism housing and the upper end face of the primary booster block (24), and is perpendicular to the center of the motor shaft (2) axis; A first cylindrical guide rail support (37) and a second cylindrical guide rail support (50) are fixedly mounted on both sides of the first piston installation through hole (35) on the inner end face (D2) of the booster mechanism housing, and the first cylindrical guide rail support (37) A cylindrical guide rail (25) is fixedly installed between the guide rail support (37) and the second cylindrical guide rail support (50), and the cylindrical guide rail (25) is parallel to the lever shaft (8); The bottom of the first-level booster block support seat (27) is fixedly installed, and the top of the first-level booster block support seat (27) is provided with a semicircular guide groove (36); The rear brake caliper body (14) has a left-right symmetrical structure, and a second piston installation through hole (46) is arranged in the middle; the center of the second piston installation through hole (46) and the first piston installation through hole (35) The axes are coincident and the radii of the two are equal; the front end surface (A1) of the rear brake caliper body is symmetrically and fixedly installed with the first circular arc guide rail (42) and the second circular arc guide rail (43); the rear end surface of the rear brake caliper body (B1) ) is fixedly connected to the front end surface (A2) of the booster housing; The two-stage boosting mechanism includes a primary boosting block (24), a secondary boosting block (26), a piston (13), a first cylindrical roller (23) and a second cylindrical roller (62); The first-stage booster block (24) has a square structure, the front end surface (A3) of the first-stage booster block is provided with a first threaded hole (28) whose axis is perpendicular to the plane, and the motor shaft (2) passes through the end. The motor shaft through hole (30) on the cover (4) is connected with the internal thread on the first threaded hole (28) through the external thread on the motor shaft (2); ) are respectively provided with a first lever push shaft (52), a first lever push shaft fixed limit rod (53), a second lever push shaft (55), and a second lever push shaft fixed limit rod ( 56), the four are all cylindrical structures and the central axes coincide with each other, the radii of the first lever push shaft (52) and the second lever push shaft (55) are equal, and the first lever push shaft fixes the limit rod (53) and The radius of the second lever push shaft fixed limit rod (56) is larger than that of the first lever push shaft (52) and the second lever push shaft (55); a semi-cylindrical semicircle The guide rail (57), the semi-circular guide rail (57) is matched with the semi-circular guide groove (36) on the first-level force intensifying block support seat (27), and the first-level force-enhancing block support seat (27) is used to support the first-level force-enhancing block (24), and play a motion guiding role; the top of the first-level force-enhancing block (24) is provided with more than two rectangular through grooves (54), and the bottom of the rectangular through-groove (54) is parallel to the first-level force-enhancing block (54). 24) the upper and lower planes, the longitudinal symmetry lines of each groove are parallel to each other; The upper and lower end surfaces of the second-level force-enhancing block (26) are parallel to each other, and each side surface is perpendicular to its upper and lower end surfaces. The through-grooves (54) are equal, and the positions are one-to-one with corresponding bumps (59). Moving, a circular through hole (58) whose central axis is perpendicular to the end face is provided on the left end face (A4) of the secondary force increasing block, the cylindrical guide rail (25) passes through the circular through hole (58), and the secondary force increasing block (26) can be moved axially along the cylindrical guide rail (25), the first inclined surface (B4) of the secondary force increasing block and the second inclined surface (C4) of the secondary force increasing block are respectively connected with the first cylindrical roller (23) and the second inclined surface (C4) The cylindrical rollers (62) are in contact, and the first inclined surface (B4) of the second-stage force intensifier block and the second inclined surface (C4) of the second-stage force-enhancing block are two inclined surfaces with the same shape, which are parallel to each other and perpendicular to the two-stage force-increasing block. the upper and lower end faces of the force block (26); The main body of the piston (13) has a circular structure, and its cross section is rectangular. Cylindrical roller support (21), second cylindrical roller support (22), third cylindrical roller support (60), fourth cylindrical roller support (61); first cylindrical roller (23) Both ends are respectively supported between the first cylindrical roller support (21) and the second cylindrical roller support (22) through bearings; both ends of the second cylindrical roller (62) are respectively supported on the third cylindrical roller through bearings between the sub-support (60) and the fourth cylindrical roller support (61); the central axes of the first cylindrical roller (23) and the second cylindrical roller (62) are parallel to each other, and both are parallel to the rear end surface of the piston ( B5) parallel; When the braking force is not 0, the first cylindrical roller (23) is in contact with the first inclined surface (B4) of the second-level force increasing block, and the second cylindrical roller (62) is in contact with the second-level force increasing block. The two inclined planes (C4) are in 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 (58). The planes where the two contact lines are located are perpendicular to the motor axis and parallel to The plane opposite to the first inclined surface (B4) of the secondary force intensifier block and the second inclined surface (C4) of the secondary force intensifier block; The lever boosting mechanism comprises a lever (7), a lever shaft (8), a lever connecting rod rotating pin (9) and a connecting rod (10); The lever (7) has three connecting ends, which are a connecting rod connecting end (64), a first lever pushing shaft connecting end (68), a second lever pushing shaft connecting end (70), and the lever (7) is Y. A left-right symmetrical structure, the first lever push shaft connection end (68) and the second lever push shaft connection end (70) are on both sides of the left and right symmetry plane, and are symmetrical to each other, the inner side of the first lever push shaft connection end (68) and the second lever push shaft connection end (68) The distance between the inner sides of the connecting ends (70) of the two lever push shafts is equal to the distance between the outer end face of the first lever push shaft fixed limit rod (53) and the outer end face of the second lever push shaft fixed limit rod (56); The rod connecting end (64) is located on the left-right symmetrical plane of the lever (7); the end of the connecting rod connecting end (64) is sequentially provided with a first lever connecting rod rotating pin installation through hole (65) and a lever shaft installation through hole (65) from the outside to the inside. A hole (66); the end of the first lever push shaft connection end (68) is provided with a first lever push shaft installation U-shaped groove (67); the end of the second lever push shaft connection end (70) is provided with a second lever push shaft The shaft is installed with a U-shaped groove (69); the first lever push shaft (52) is placed in the first lever push shaft installation U-shaped groove (67), and can move back and forth along the first lever push shaft installation U-shaped groove (67) , the second lever push shaft (55) is placed in the second lever push shaft installation U-shaped groove (69), and can move back and forth along the second lever push shaft installation U-shaped groove (69); the lever shaft (8) passes through The lever shaft is installed in a through hole (66), and the lever (7) can be rotated around the lever shaft (8); The connecting rod (10) has four connecting ends, the connecting rod (10) is a Y-shaped left-right symmetrical structure, the first lever connecting end (73) and the second lever connecting end (76) are at one end, and the first lever connecting The end (73) and the second lever connecting end (76) are parallel to each other, and there is a groove (75) between them. The two inner end faces of the groove (75) are parallel to each other, and the distance between the two inner end faces is equal to the rotation of the first lever link. The length of the pin mounting through hole (65), the second lever connecting end (73) is provided with a second lever connecting end (73), and the second lever connecting end (76) is provided with a third lever connecting hole (74). The rod rotation pin installation through hole (77), the second lever link rotation pin installation through hole (74) and the third lever link rotation pin installation through hole (77) have their central axes coincide with each other; the first front brake caliper body is connected The end (72) and the second front brake caliper body connecting end (78) are located at the other end of the connecting rod (10), and the end of the first front brake caliper body connecting end (72) is provided with a first connecting rod rotating pin for installation a through hole (71), the end of the second front brake caliper body connecting end (78) is provided with a second connecting rod rotating pin mounting through hole (79); The lever connecting rod rotating pin (9) passes through the second lever connecting rod rotating pin installation through hole (74), the first lever connecting rod rotating pin mounting through hole (65), and the third lever connecting rod rotating pin installation in sequence a through hole (77), so as to realize the hinged connection of the lever (7) and the connecting rod (10); The front brake caliper body (18) has a left-right symmetrical structure; the side section is an inverted L shape; the front brake caliper body (18) includes a first front brake caliper body support (16), a second front brake The caliper body support (82), the first arc groove (85), the second arc groove (86), the friction plate support plate (87), the friction plate support plate (87) is located in the front brake caliper body ( 18), the middle is a U-shaped groove for fixed installation of the second friction plate (17), the upper part of the front brake caliper body (18) is provided with a first arc groove (85) and a second arc groove The groove (86), the first arc groove (85) and the second arc groove (86) are in a symmetrical relationship with respect to the left and right central symmetry planes of the front brake caliper body (18); after installation, the second arc guide rail (43) is placed in the first arc groove (85), the shape and size of the second arc guide (43) are the same as the first arc groove (85), and the second arc guide (43) can only be Free movement forward and backward along the first arc groove (85); the first arc guide (42) is placed in the second arc groove (86), and the shape and size of the first arc guide (42) are the same as those of the second arc guide (42). The arc groove (86) is the same, the first arc guide rail (42) can only move freely forward and backward along the second arc groove (86); the first front brake caliper body support (16) and the second front brake The caliper body support (82) is fixedly installed on the top of the front brake caliper body (18), and the first front brake caliper body support (16) and the second front brake caliper body support (82) are opposite to the front brake caliper body support (82). The left and right central symmetrical planes of the caliper body (18) are in a symmetrical relationship, and the first front brake caliper body support (16) is fixedly installed above the second arc groove (86), with a U-shaped groove in the middle, and the U-shaped Both sides of the groove are respectively provided with a first rotating pin mounting hole (80) and a second rotating pin mounting hole (81), and the central axes of the first rotating pin mounting hole (80) and the second rotating pin mounting hole (81) coincide with each other The second front brake caliper body support (82) is fixedly installed above the first arc groove (85), with a U-shaped groove in the middle, and third rotation pin mounting holes (83) are respectively provided on both sides of the U-shaped groove ) and the fourth rotating pin mounting hole (84), the central axes of the third rotating pin mounting hole (83) and the fourth rotating pin mounting hole (84) coincide with each other; The first rotating pin (90) is installed between the first rotating pin mounting hole (80) and the second rotating pin mounting hole (81) through the first bearing (88) and the second bearing (89), and the first front brake The first connecting rod rotating pin mounting hole (71) on the connecting end (72) of the clamp body is matched and connected with the first rotating pin (90); the second rotating pin (91) passes through the third bearing (92) and the fourth bearing ( 93) Installed between the third rotating pin mounting hole (83) and the fourth rotating pin mounting hole (84), the second connecting rod rotating pin mounting hole (79) on the connecting end (78) of the second front brake caliper body ) is matched and connected with the second rotating pin (91). 2. A bidirectional synchronous booster type electromechanical brake actuator based on a linear motor according to claim 1, characterized in that: on the second piston installation through hole (46), along the first friction plate (15) ) towards the direction of the booster mechanism housing (6), a first annular groove (44) and a second annular groove (45) are arranged in sequence, and the first annular groove (44) is used to install the dust ring (12), The second annular groove (45) is used to install the sealing ring (11).

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