阅读说明：本技术 一种基于直线电机的单向双级增力式电子机械制动执行器 (One-way two-stage boosting type electromechanical brake actuator based on linear motor ) 是由 杨坤 陈玉 王杰 刘国栋 房永� 李敏 周稼铭 常依乐 于 2019-10-19 设计创作，主要内容包括：本发明提供一种应用于汽车上的基于直线电机的单向双级增力式电子机械制动执行器,属于汽车制动技术领域；它主要包括电机、安装基体、双级增力机构三部分；电机为直线电机；一级增力块顶部的矩形贯通凹槽与二级增力块底部的凸块构成一级增力；二级增力块第一斜面和二级增力块第二斜面分别与第一圆柱滚子和第二圆柱滚子接触,并构成二级增力；施加制动时,直线电机通过双级增力机构、活塞等带动第一摩擦片压向制动盘,执行器在反作用力作用下整体沿导轨向电机侧移动,使第二摩擦片压向制动盘,从而对制动盘施加制动夹紧力,通过调节电机力矩可调节制动夹紧力的大小,该方案具有结构紧凑的优点,可为传统制动系统和未来的主动制动提供解决方案。(The invention provides a linear motor-based one-way two-stage boosting type electromechanical brake actuator applied to an automobile, belonging to the technical field of automobile braking; the motor mainly comprises a motor, an installation base body and a two-stage force increasing mechanism; 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; when applying the braking, linear electric motor drives first friction disc through doublestage boosting mechanism, piston etc. and presses to the brake disc, and the executor is whole to move to the motor side along the guide rail under the reaction force effect, makes the second friction disc press to the brake disc to exert the braking clamping force to the brake disc, through the size of the adjustable braking clamping force of adjusting motor moment, this scheme has compact structure's advantage, can provide the solution for traditional braking system and future initiative braking.)

1. The utility model provides a one-way doublestage reinforcement formula electromechanical braking executor based on linear electric motor which characterized in that: the device mainly comprises an installation base body, a motor and a two-stage force increasing mechanism;

the motor (1) is a linear motor, and an external thread is arranged on a motor shaft (2);

the mounting base comprises an end cover (4), an actuator shell and a bracket;

the actuator shell comprises a force increasing mechanism shell (6), a brake caliper (15) and a first-stage force increasing block supporting seat (21);

the force-increasing mechanism shell (6) is of a cylindrical structure, and a first piston mounting through hole (29) is formed in the inner end face (B1) of the force-increasing mechanism shell;

a first cylindrical guide rail support (31) and a second cylindrical guide rail support (35) are fixedly installed on two sides of the first piston installation through hole (29), a cylindrical guide rail (9) is fixedly installed between the first cylindrical guide rail support (31) and the second cylindrical guide rail support (35), and the cylindrical guide rail (9) is parallel to the upper end face of the first-stage boosting block (7) and is perpendicular to the central axis of the motor shaft (2);

a first-stage boosting block supporting seat (21) is fixedly arranged at the bottom of the inner side of the boosting mechanism shell (6), and a semicircular guide groove (30) is formed in the top of the first-stage boosting block supporting seat (21);

a second piston mounting through hole (38) is formed in the middle of the brake caliper (15), the second piston mounting through hole (38) has the same radius as a first piston mounting through hole (29) of the force-increasing mechanism shell (6), and the central axis of the second piston mounting through hole coincides with the central axis of the first piston mounting through hole;

the double-stage force increasing mechanism comprises a first-stage force increasing block (7), a second-stage force increasing block (8), a piston (11), a first cylindrical roller (20) and a second cylindrical roller (46);

the main body of the primary force-increasing block (7) is of a cuboid structure, and a first threaded hole (22) with the axis vertical to the plane is formed in the front end surface (A3) of the primary force-increasing block; the motor shaft (2) penetrates through a motor shaft through hole (24) in the end cover (4) and then is fixedly connected with the first threaded hole (22) through external threads; the bottom of the first-stage boosting block (7) is provided with a semi-cylindrical semi-circular guide rail (42), the semi-circular guide rail (42) is matched with a semi-circular guide groove (30) on the first-stage boosting block supporting seat (21), and the first-stage boosting block supporting seat (21) is used for supporting the first-stage boosting block (7) and plays a role in motion guiding; the top of the first-stage boosting block (7) is provided with more than 2 rectangular through grooves (41), the bottoms of the rectangular through grooves (41) are parallel to the upper and lower planes of the first-stage boosting block (7), and the longitudinal symmetrical center lines of the grooves are parallel to each other;

the upper end face and the lower end face of the second-stage boosting block (8) are parallel to each other, each side face is perpendicular to the upper end face and the lower end face of the second-stage boosting block (8), the lower end face of the second-stage boosting block (8) is provided with lugs (44) which are equal to the rectangular through grooves (41) at the tops of the first-stage boosting blocks (7) in number and correspond to each other in position one to one, each lug (44) is embedded into the corresponding rectangular through groove (41) and can move back and forth in the rectangular through groove (41), the left end face (A4) of the second-stage boosting block is provided with a circular through hole (43) with an axis perpendicular to the end face, the cylindrical guide rail (9) penetrates through the circular through hole (43), the second-stage boosting block (8) can move axially along the cylindrical guide rail (9), a first inclined face (B4) of the second inclined face (C4) of the second-stage boosting block is in contact with the first cylindrical roller (20) and the second cylindrical roller (46), and the first, the two are parallel to each other, and the inclined plane is vertical to the upper end surface and the lower end surface of the second-stage boosting block (8);

the main body of the piston (11) is of a circular ring structure, the section of the main body is rectangular, the front end surface (A5) of the piston is used for fixedly connecting a first friction plate (14), and the rear end surface (B5) of the piston is fixedly connected with 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); two ends of the first cylindrical roller (20) are respectively supported between the first cylindrical roller support (10) and the second cylindrical roller support (19) through bearings; two ends of the second cylindrical roller (46) are respectively supported between the third cylindrical roller support (45) and the fourth cylindrical roller support (47) through bearings; the axes of the first cylindrical roller (20) and the second cylindrical roller (46) are parallel to each other and are parallel to the rear end surface (B5) of the piston;

when the braking force is not 0, the first cylindrical roller (20) is in contact with a first inclined surface (B4) of the second-stage force-increasing block, the second cylindrical roller (46) is in contact with a second inclined surface (C4) of the second-stage force-increasing block, two contact lines are always parallel to each other and perpendicular to the central axis of the circular through hole (43) in the whole movement process, and the plane of the two contact lines is perpendicular to the axis of the motor and parallel to the plane opposite to the first inclined surface (B4) of the second-stage force-increasing block and the second inclined surface (C4) of the second-stage force-increasing block.

2. The linear motor-based one-way two-stage boosting type electromechanical brake actuator as claimed in claim 1, wherein: and a first annular groove (36) and a second annular groove (37) are sequentially arranged on the second piston mounting through hole (38) along the direction from the first friction plate (14) to the force-increasing mechanism shell (6), the first annular groove (36) is used for mounting a dust ring (13), and the second annular groove (37) is used for mounting a sealing ring (12).

Technical Field

The invention belongs to the technical field of automobile braking, and particularly relates to a one-way two-stage boosting type electromechanical brake actuator based on a linear motor.

Background

The brake system is an important component which directly influences the driving safety of the automobile and is a hotspot of research of various automobile companies; as described in "light automobile electromechanical braking and stability control system research" (yangkun. light automobile electromechanical braking and stability control system research [ D ]. vinpocetine university, 2009), the electromechanical braking is used as a new braking system, and larger components such as a vacuum booster and a hydraulic pipeline are eliminated, so that the whole automobile chassis is simpler and more flexible in arrangement, has the advantages of high pressure regulation speed and accuracy, and can significantly improve the braking performance of the whole automobile.

Besides the advantage of improving the braking safety of the traditional automobile, the electromechanical braking can also effectively meet the requirements of new energy automobiles and automatic driving automobiles on braking systems; for example, as described in the EMB-based decoupled braking energy recovery system research [ J ] automotive engineering, 2016, 38(8):1072-1079 ], the electromechanical braking system can meet the requirements of the decoupled braking energy recovery system on the accurate and independent adjustment of the brake pedal feel and the wheel braking force, and can realize the active braking function, so that the research on the electromechanical braking system has important significance for improving the economy of the electric vehicle and promoting the electromotion and intellectualization of the vehicle, which again becomes the object of the research on the vehicle braking system.

The electromechanical brake actuator is based on the traditional floating caliper disc brake, adopts a linear motor as a power source, can effectively reduce the volume of the electromechanical brake actuator, and particularly is a compact vehicle with a small brake system installation space.

Disclosure of Invention

The utility model provides a one-way doublestage reinforcement formula electromechanical braking executor based on linear electric motor which characterized in that: the device mainly comprises an installation base body, a motor and a two-stage force increasing mechanism.

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

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

The actuator shell comprises a force increasing mechanism shell (6), a brake caliper (15) and a first-stage force increasing block supporting seat (21).

The force-increasing mechanism shell (6) is of a cylindrical structure, and a first piston mounting through hole (29) is formed in the inner end face (B1) of the force-increasing mechanism shell.

A first cylindrical guide rail support (31) and a second cylindrical guide rail support (35) are fixedly mounted on two sides of the first piston mounting through hole (29), a cylindrical guide rail (9) is fixedly mounted between the first cylindrical guide rail support (31) and the second cylindrical guide rail support (35), and the cylindrical guide rail (9) is parallel to the upper end face of the first-stage boosting block (7) and is perpendicular to the central axis of the motor shaft (2).

A first-stage boosting block supporting seat (21) is fixedly arranged at the bottom of the inner side of the boosting mechanism shell (6), and a semicircular guide groove (30) is arranged at the top of the first-stage boosting block supporting seat (21).

A second piston mounting through hole (38) is formed in the middle of the brake caliper (15), the second piston mounting through hole (38) is equal to the first piston mounting through hole (29) of the force increasing mechanism shell (6) in radius, and the central axis of the second piston mounting through hole coincides with the central axis of the first piston mounting through hole.

And a first annular groove (36) and a second annular groove (37) are sequentially arranged on the second piston mounting through hole (38) along the direction from the first friction plate (14) to the force-increasing mechanism shell (6), the first annular groove (36) is used for mounting a dust ring (13), and the second annular groove (37) is used for mounting a sealing ring (12).

The double-stage force increasing mechanism comprises a first-stage force increasing block (7), a second-stage force increasing block (8), a piston (11), a first cylindrical roller (20) and a second cylindrical roller (46).

The main body of the primary force-increasing block (7) is of a cuboid structure, and a first threaded hole (22) with the axis vertical to the plane is formed in the front end surface (A3) of the primary force-increasing block; the motor shaft (2) penetrates through a motor shaft through hole (24) in the end cover (4) and then is fixedly connected with the first threaded hole (22) through external threads; the bottom of the first-stage boosting block (7) is provided with a semi-cylindrical semi-circular guide rail (42), the semi-circular guide rail (42) is matched with a semi-circular guide groove (30) on the first-stage boosting block supporting seat (21), and the first-stage boosting block supporting seat (21) is used for supporting the first-stage boosting block (7) and plays a role in motion guiding; the top of the first-stage boosting block (7) is provided with more than 2 rectangular through grooves (41), the bottoms of the rectangular through grooves (41) are parallel to the upper and lower planes of the first-stage boosting block (7), and the longitudinal symmetrical center lines of the grooves are mutually parallel.

The upper end face and the lower end face of the second-stage force-increasing block (8) are parallel to each other, each side face is perpendicular to the upper end face and the lower end face of the second-stage force-increasing block, the lower end face of the second-stage force-increasing block (8) is provided with a plurality of lugs (44) which are equal to the rectangular through grooves (41) at the top of the first-stage force-increasing block (7) in number and are positioned in a one-to-one correspondence manner, each lug (44) is embedded into the corresponding rectangular through groove (41) and can move back and forth in the rectangular through groove (41), the left end face (A4) of the second-stage force-increasing block is provided with a circular through hole (43) with the axis perpendicular to the end face, the cylindrical guide rail (9) penetrates through the circular through hole (43), the second-stage force-increasing block (8) can move axially along the cylindrical guide rail (9), a first inclined face (B4) of the second inclined face (C4) of the second-stage force-increasing block is in contact with the first cylindrical, the two are parallel to each other, and the inclined plane is vertical to the upper and lower end surfaces of the second-stage boosting block (8).

The main body of the piston (11) is of a circular ring structure, the section of the main body is rectangular, the front end surface (A5) of the piston is used for fixedly connecting a first friction plate (14), and the rear end surface (B5) of the piston is fixedly connected with 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); two ends of the first cylindrical roller (20) are respectively supported between the first cylindrical roller support (10) and the second cylindrical roller support (19) through bearings; two ends of the second cylindrical roller (46) are respectively supported between the third cylindrical roller support (45) and the fourth cylindrical roller support (47) through bearings; the axes of the first cylindrical roller (20) and the second cylindrical roller (46) are parallel to each other, and are both parallel to the piston rear end face (B5).

When the braking force is not 0, the first cylindrical roller (20) is in contact with a first inclined surface (B4) of the second-stage force-increasing block, the second cylindrical roller (46) is in contact with a second inclined surface (C4) of the second-stage force-increasing block, two contact lines are always parallel to each other and perpendicular to the central axis of the circular through hole (43) in the whole movement process, and the plane of the two contact lines is perpendicular to the axis of the motor and parallel to the plane opposite to the first inclined surface (B4) of the second-stage force-increasing block and the second inclined surface (C4) of the second-stage force-increasing block.

Compared to conventional braking system solutions: according to the scheme, all functions of traditional braking can be realized through the linear motor and the related transmission system, and active braking can be realized, so that a solution is provided for a traditional vehicle braking system and a decoupling type braking energy recovery and intelligent driving vehicle braking system of a new energy vehicle.

Compared with the existing electromechanical brake actuator: the scheme adopts a linear motor and a two-stage force increasing mechanism, and is a brand new structural form; under the condition of the same volume, the boosting effect of the scheme is larger, and under the condition of the same braking force, the scheme has smaller volume; in addition, the linear motor is adopted as the brake actuator, the size of the electronic mechanical brake actuator can be effectively reduced, and the problem that the installation space of the compact vehicle electronic mechanical brake system is narrow can be effectively solved.

Drawings

Fig. 1 is an assembly diagram of a one-way two-stage boosting type electromechanical brake actuator based on a linear motor.

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

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

Fig. 4 is a three-dimensional view of an actuator housing.

Fig. 5 is a cross-sectional view of the actuator housing 1.

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

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

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

Fig. 9 is an exploded view of the actuator housing 1.

Fig. 10 is an exploded view of the actuator housing 2.

Fig. 11 is a three-dimensional structure diagram of the first-stage force-increasing block (7) of the two-stage force-increasing mechanism.

Fig. 12 is a front view of the first-stage force-increasing block (7) of the double-stage force-increasing mechanism.

Fig. 13 is a top view of the first-stage force-increasing block (7) of the two-stage force-increasing mechanism.

Fig. 14 is a three-dimensional structure diagram of a two-stage force-increasing block (8) of the two-stage force-increasing mechanism.

Fig. 15 is a plan view of the two-stage force-increasing block (8) of the two-stage force-increasing mechanism.

Fig. 16 is a side view of the two-stage force increasing block (8) of the two-stage force increasing mechanism.

Fig. 17 is a bottom view of the two-stage force increasing block (8) of the two-stage force increasing mechanism.

Fig. 18 is a three-dimensional structural view of the piston (11) of the two-stage force amplification mechanism.

Fig. 19 is a side view of the dual stage force amplifier piston (11).

Fig. 20 is a front view of the dual stage force amplifier piston (11).

Fig. 21 is a force-increasing principle schematic diagram of the double-stage force-increasing mechanism.

Fig. 22 is a three-dimensional structural view of a stent.

Fig. 23 is a three-dimensional structural view of a stent.

Fig. 24 is a front view of the bracket.

Fig. 25 is a top view of the stent.

Fig. 26 is a top view of the bracket mounting.

Fig. 27 is a three-dimensional view of an electromechanical brake actuator.

In the figure: 1. a motor; 2. a motor shaft; 3. a motor fixing bolt; 4. an end cap; 5. an end cover fixing bolt; 6. a force increasing mechanism housing; 7. a first-stage force increasing block; 8. a second-stage force increasing block; 9. a cylindrical guide rail; 10. a first cylindrical roller support; 11. A piston; 12. a seal ring; 13. a dust ring; 14. a first friction plate; 15. a brake caliper; 16. a brake caliper limit cross bar; 17. A second friction plate; 18. a brake disc; 19. a second cylindrical roller support; 20. a first cylindrical roller; 21. a first-stage reinforcement block supporting seat; 22. a first threaded hole; 23. a first motor fixing threaded hole; 24. a motor shaft through hole; 25. the second motor fixes the threaded hole; 26. the first end cover is fixed with the threaded hole; 27. a first support bar; 28. a first support rod connection hole; 29. a first piston mounting through-hole; 30. a semicircular guide groove; 31. a first cylindrical guide rail support; 32. the second end cover is fixedly threaded; 33. a second support bar connection hole; 34. a second support bar; 35. a second cylindrical guide rail support; 36. a first annular groove; 37. a second annular groove; 38. a second piston mounting through hole; 39. a first cylindrical guide rail mounting hole; 40. a second cylindrical guide rail mounting hole; 41. A rectangular through groove; 42. a semicircular guide rail; 43. a circular through hole; 44. a bump; 45. a third cylindrical roller support; 46. a second cylindrical roller; 47. a fourth cylindrical roller support; 48. a piston central bore; 49. a bracket first mounting threaded hole; 50. a first support arm; 51. a second support arm; 52. a second mounting threaded hole of the bracket; 53. the first bracket hub is fixedly threaded; 54. The bracket fixes the cross rod; 55. the second bracket hub is fixed with a threaded hole; 56. a bracket first bolt; 57. and a second bolt of the bracket.

The meaning of each end face and included angle in the figure is as follows:

in FIGS. 4 to 10: a1, the rear end face of the force-increasing mechanism shell; b1, the inner end face of the force-increasing mechanism shell; c1, the front end face of the force-increasing mechanism shell; a2, brake caliper rear end face.

In fig. 11: a3, front end face of the first-stage force-increasing block.

In FIGS. 14 to 17 and 23: a4, the left end face of the second-stage force-increasing block; b4, a first inclined surface of the second-stage force-increasing block; c4, and a second slope of the secondary force increasing block.

In FIGS. 18 to 19: a5, the front end face of the piston; b5, piston rear end face.

In fig. 21: a6, piston center axis; b6, groove center line; alpha, the included angle between the central axis A6 of the piston and the central axis B6 of the groove; beta, inclined planes B4 and C4 form included angles with the central axis A6 of the piston.

In fig. 22-23: a7, a brake caliper limiting surface; b7, the left end face of the brake caliper limit cross bar; c7, the upper end surface of the second bracket arm; d7, the front end face of the second bracket arm; e7, fixing the upper end surface of the cross rod by the first bracket; f7, fixing the upper end face of the cross bar by the second support; g7, the front end face of the first support arm; h7, the upper end face of the first support arm; i7, fixing the front end face of the cross bar by the bracket.

Detailed description of the preferred embodiments

The invention provides a one-way two-stage reinforcement type electromechanical brake actuator based on a linear motor, which is further described in detail by referring to the attached drawings and taking examples in order to make the technical scheme and the effect of the invention clearer and more clear; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

A one-way two-stage boosting electromechanical brake actuator based on a linear motor mainly comprises an installation base body, a motor and a two-stage boosting mechanism.

The motor (1) is a linear motor, and as shown in figure 1, an external thread is arranged on a motor shaft (2).

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

As shown in FIG. 2, 8 first motor fixing threaded holes (23) are arranged on the boss at the end part of the motor (1), the first motor fixing threaded holes (23) play a role of fixing the motor, and the number is not limited to 8.

As shown in fig. 3, the end cover (4) is provided with 1 motor shaft through hole (24), 8 second motor fixing threaded holes (25) and 11 first end cover fixing threaded holes (26); the second motor fixing threaded holes (25) mainly play a role of fixing the motors, the number is not limited to 8, and the number can be increased or decreased according to the actual installation condition; the first end cover fixing threaded holes (26) are used for fixing the end covers (4), the number of the first end cover fixing threaded holes is not limited to 11, and the number of the first end cover fixing threaded holes can be increased or decreased according to actual installation conditions.

As shown in fig. 1 and 4-10, the actuator shell comprises a force increasing mechanism shell (6), a brake caliper (15) and a first-stage force increasing block supporting seat (21).

As shown in fig. 4, the force-increasing mechanism housing (6) is a cylindrical structure, and a second end cap fixing threaded hole (32) matched with the first end cap fixing threaded hole (26) is formed in the rear end face (a1) of the force-increasing mechanism housing, and the two are identical in number and correspond to each other in position.

As shown in fig. 4-5, a first piston mounting through hole (29) is provided on an inner end surface (B1) of the force increasing mechanism case.

As shown in fig. 4-5 and 8-9, a first cylindrical guide rail support (31) and a second cylindrical guide rail support (35) are fixedly mounted on two sides of a first piston mounting through hole (29) on the inner end surface (B1) of the force-increasing mechanism shell, a cylindrical guide rail (9) is fixedly mounted between the first cylindrical guide rail support (31) and the second cylindrical guide rail support (35), and the cylindrical guide rail (9) is parallel to the upper end surface of the first-stage force-increasing block (7) and is perpendicular to the central axis of the motor shaft (2).

A first-stage boosting block supporting seat (21) is fixedly arranged at the bottom of the inner side of the boosting mechanism shell (6), and a semicircular guide groove (30) is arranged at the top of the first-stage boosting block supporting seat (21).

As shown in fig. 7 to 10, the brake caliper (15) has a bilaterally symmetrical structure, and a second piston mounting through hole (38) is provided in the middle.

As shown in fig. 5 to 6, a first annular groove (36) and a second annular groove (37) are sequentially formed in the second piston mounting through hole (38) along the direction from the first friction plate (14) to the force increasing mechanism shell (6), the first annular groove (36) is used for mounting the dust ring (13), and the second annular groove (37) is used for mounting the sealing ring (12).

As shown in fig. 5, the first piston mounting through hole (29) of the force-increasing mechanism housing (6) and the second piston mounting through hole (38) of the caliper (15) have the same radius and the center axes thereof coincide with each other.

As shown in fig. 7-10, a first support rod (27) and a second support rod (34) are symmetrically arranged on the left and right sides of the exterior of the brake caliper (15), a first support rod connection hole (28) is formed in the first support rod (27), and a second support rod connection hole (33) is formed in the second support rod (34).

As shown in fig. 10, the opposite side of the second piston mounting through hole (38) of the caliper (15) is in a U-shaped groove structure for fixing the second friction plate (17), which is similar to the conventional caliper structure.

As shown in FIG. 1, the double-stage force increasing mechanism comprises a first-stage force increasing block (7), a second-stage force increasing block (8), a piston (11), a first cylindrical roller (20) and a second cylindrical roller (46).

As shown in fig. 11-13, the main body of the first-stage force-increasing block (7) is a cuboid structure, and a first threaded hole (22) with an axis vertical to the plane is arranged on the front end surface (a3) of the first-stage force-increasing block; the bottom of the first-stage boosting block (7) is provided with a semi-cylindrical semi-circular guide rail (42), the semi-circular guide rail (42) is matched with a semi-circular guide groove (30) on the first-stage boosting block supporting seat (21), and the first-stage boosting block supporting seat (21) is used for supporting the first-stage boosting block (7) and plays a role in motion guiding; the top of the first-stage boosting block (7) is provided with more than 2 rectangular through grooves (41), the bottoms of the rectangular through grooves (41) are parallel to the upper and lower planes of the first-stage boosting block (7), the longitudinal symmetry lines of the grooves are parallel to each other, the symmetry center line in the length direction forms an angle alpha with the motor axis, and the angle alpha is also the included angle between the piston axis A6 and the groove center line B6, as shown in figure 21.

As shown in fig. 1, 3 and 11, after a motor shaft (2) passes through a motor shaft through hole (24) on an end cover (4), the motor shaft is fixedly connected with a first threaded hole (22) through external threads;

as shown in figures 14-17, the upper and lower end faces of the second-stage force-increasing block (8) are parallel to each other, each side face is perpendicular to the upper and lower end faces, the lower end face of the second-stage force-increasing block (8) is provided with a corresponding lug (44) which is equal to the rectangular through groove (41) at the top of the first-stage force-increasing block (7) in number and is provided with a round through hole (43) with the axis perpendicular to the end face, each lug (44) is embedded into the corresponding rectangular through groove (41) and can move back and forth in the rectangular through groove (41), the left end face (A4) of the second-stage force-increasing block is provided with a round through hole (43) with the axis perpendicular to the end face, the cylindrical guide rail (9) passes through the round through hole (43), the second-stage force-increasing block (8) can move axially along the cylindrical guide rail (9), the first inclined face (B4) of the second, the first inclined plane (B4) of the second-stage force-increasing block and the second inclined plane (C4) of the second-stage force-increasing block are two inclined planes with the same shape, the two inclined planes are parallel to each other, the inclined planes are perpendicular to the upper end face and the lower end face, and form an angle beta with the central line of the motor, and the angle beta is the included angle between the inclined planes B4 and C4 and the axis A6 of the piston, as shown in figure 21.

As shown in fig. 18-20, the main body of the piston (11) is a circular ring structure, the cross section of the main body is rectangular, the front end surface (a5) of the piston is used for fixedly connecting a first friction plate (14), and the rear end surface (B5) of the piston is fixedly connected with 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); two ends of the first cylindrical roller (20) are respectively supported between the first cylindrical roller support (10) and the second cylindrical roller support (19) through bearings; two ends of the second cylindrical roller (46) are respectively supported between the third cylindrical roller support (45) and the fourth cylindrical roller support (47) through bearings; the axes of the first cylindrical roller (20) and the second cylindrical roller (46) are parallel to each other and to the piston rear end face (B5).

When the braking force is not 0, as shown in fig. 21, the first cylindrical roller (20) is always in contact with the first inclined surface (B4) of the second-stage force-increasing block, the second cylindrical roller (46) is always in contact with the second inclined surface (C4) of the second-stage force-increasing block, two contact lines are always parallel to each other and perpendicular to the central axis of the circular through hole (43) in the whole movement process, and the plane where the two contact lines are located is perpendicular to the axis of the motor and parallel to the plane opposite to the first inclined surface (B4) of the second-stage force-increasing block and the second inclined surface (C4) of the second-stage force-increasing block.

As shown in fig. 22-26, the bracket is composed of a first bracket arm (50), a brake caliper limiting cross bar (16), a second bracket arm (51) and a bracket fixing cross bar (54), and the first bracket arm (50), the brake caliper limiting cross bar (16) and the second bracket arm (51) are all of a cuboid structure.

As shown in fig. 22-23, a bracket first mounting threaded hole (49) is formed in the length direction of the first bracket arm (50), and the central axis of the bracket first mounting threaded hole (49) is perpendicular to the front end surface (G7) of the first bracket arm; a second bracket mounting threaded hole (52) is formed in the length direction of the second bracket arm (51), and the central axis of the second bracket mounting threaded hole (52) is perpendicular to the front end face (D7) of the second bracket arm; the first bracket arm (50) is fixedly connected with a brake caliper limiting surface (A7) of a brake caliper limiting cross bar (16) through an end surface opposite to a front end surface (G7) of the first bracket arm; the second bracket arm (51) is fixedly connected with a brake caliper limiting surface (A7) of the brake caliper limiting cross bar (16) through an end surface opposite to the front end surface (D7) of the second bracket arm; the second bracket arm (51) is positioned on the left end face (B7) side of the brake caliper limiting cross bar, and the first bracket arm (50) is positioned at one end opposite to the end face (B7); the three components form a U-shaped bracket; the bracket fixing cross rod (54) is of a U-shaped structure, a first bracket hub fixing threaded hole (53) and a second bracket hub fixing threaded hole (55) which are vertical to the front end face (I7) in the central axis are symmetrically arranged on the front end face (I7), and the bracket fixing cross rod can be fixedly connected with a hub through the first bracket hub fixing threaded hole (53), the second bracket hub fixing threaded hole (55) and a bolt; the second bracket arm (51) is fixedly connected with the upper end surface (E7) of the first bracket fixed cross bar through the end surface opposite to the upper end surface (C7) of the second bracket arm; the first bracket arm (50) is fixedly connected with the upper end surface (F7) of the fixed cross bar of the second bracket through the end surface opposite to the upper end surface (H7) of the first bracket arm; the mounting of the rear bracket is shown in fig. 22.

As shown in fig. 4, 7-10 and 27, the first support rod connecting hole (28) corresponds to the bracket second mounting threaded hole (52) and is fixedly connected with the actuator shell through a bracket second bolt (57); the second supporting rod connecting hole (33) corresponds to the first mounting threaded hole (49) of the bracket and is fixedly connected with the actuator shell through a first bolt (56) of the bracket.

The invention provides a linear motor-based one-way two-stage boosting type electromechanical brake actuator, which has the following working principle:

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

when a driver steps on a brake pedal, the motor (1) is electrified, the motor shaft (2) moves forwards, the first-stage boosting block (7) moves forwards correspondingly, the first-stage boosting block (7) can only do forward and backward translational motion under the limiting action of the semicircular guide rail (42) and the semicircular guide groove (30), the rectangular through groove (41) on the first-stage boosting block (7) pushes the second-stage boosting block (8) to move through the convex block (44) on the second-stage boosting block (8), the second-stage boosting block (8) cannot move forwards and backwards but only can move leftwards and rightwards under the limiting action of the cylindrical guide rail (9), when the first-stage boosting block (7) moves forwards, the second-stage boosting block (8) can only move rightwards and can only move rightwards, the first inclined plane (B4) and the second inclined plane (C4) of the second-stage boosting block both move rightwards and correspondingly push the piston (11) to move through the first cylindrical roller (20) and the second cylindrical roller (46), under the limiting action of the first piston mounting through hole (29) and the second piston mounting through hole (38), the piston (11) can only move forwards, so that the first friction plate (14) is pushed to press the brake disc (18), after the first friction plate (14) is contacted with the brake disc (18), at the moment, the whole actuator moves towards the motor side under the reaction of positive pressure applied to the brake disc (18) by the first friction plate (14), so that the second friction plate (17) presses the brake disc (18), and finally braking force is applied to the brake disc through the first friction plate (14) and the second friction plate (17).

In the process of applying the brake, a driver can control the magnitude of the output motor force of the motor (1) through the opening degree of the brake pedal, so that the adjustment of the magnitude of the brake force is realized.

The process of brake release is as follows:

when the opening of a brake pedal is reduced by a driver, a motor (1) is electrified, a motor shaft (2) moves backwards, a first-stage boosting block (7) moves backwards correspondingly, the first-stage boosting block (7) can only do translational motion under the limiting action of a semicircular guide rail (42) and a semicircular guide groove (30), a rectangular through groove (41) in the first-stage boosting block (7) pulls a second-stage boosting block (8) to move through a bump (44) on the second-stage boosting block (8), the second-stage boosting block (8) cannot move forwards and backwards but can only do left and right movement under the limiting action of a cylindrical guide rail (9), when the first-stage boosting block (7) moves backwards correspondingly, the second-stage boosting block (8) can only move leftwards, a first inclined surface (B4) and a second inclined surface (C4) of the second-stage boosting block both move leftwards, and the pressure applied to a piston (11) is reduced through a first cylindrical roller (20) and a second cylindrical roller (46) correspondingly, namely, the pressure applied to the brake disc is reduced, when the pressure applied to the piston (11) by the motor (1) through the transmission device is reduced to 0, under the rotation motion of the brake disc, the first friction plate (14) and the second friction plate (17) are separated from the brake disc (18), and the braking pressure applied to the brake disc is reduced to 0.