阅读说明：本技术 一种基于旋转电机和滚珠丝杠的单向双级增力式电子机械制动执行器 (One-way two-stage boosting type electronic mechanical brake actuator based on rotating motor and ball screw ) 是由 杨坤 王杰 陈玉 谭迪 肖锦钊 李红旗 王鑫恫 周稼铭 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旋转电机和滚珠丝杠的单向双级增力式电子机械制动执行器,包括旋转电机及运动转换装置、安装基体、双级增力机构三部分；电机通过滚珠丝杠将电机的旋转运动转换为直线运动；一级增力块顶部与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,电机通过滚珠丝杠、双级增力机构、活塞等带动第一摩擦片压向制动盘,在反作用力作用下带动执行器沿导轨向电机侧移动,使第二摩擦片压向制动盘,从而施加制动力,通过调节电机力可调节制动力的大小,该方案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 one-way two-stage boosting type electromechanical brake actuator based on a rotating motor and a ball screw, which is applied to an automobile and comprises three parts, namely the rotating motor, a motion conversion device, an installation base body and a two-stage boosting mechanism; the motor converts the rotary motion of the motor into linear motion through a ball screw; the top of the first-stage boosting block, the rectangular through groove 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, the motor drives first friction disc through ball screw, doublestage boosting mechanism, piston etc. and presses to the brake disc, drives the executor under the reaction force and moves to the motor side along the guide rail, makes the second friction disc press to the brake disc to exert braking force, through the size of the adjustable braking force of adjusting motor power, this scheme 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 rotating electrical machines and ball, its characterized in that: mainly comprises an installation base body, a motor, a motion conversion device and a two-stage force increasing mechanism;

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

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

the motor shaft (2) penetrates through a motor shaft through hole (25) in the end cover (4) and then is in fit connection with an internal spline on the lead screw (23);

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 (30) is formed in the inner end face (B1) of the force-increasing mechanism shell;

a first cylindrical guide rail support (32) and a second cylindrical guide rail support (36) are fixedly installed on two sides of a first piston installation through hole (30) on the inner end face (B1) of the force-increasing mechanism shell, a cylindrical guide rail (9) is fixedly installed between the first cylindrical guide rail support (32) and the second cylindrical guide rail support (36), and the cylindrical guide rail (9) is parallel to the upper end face 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 installed at the bottom of the inner side of the boosting mechanism shell (6), a guide groove (31) is formed in the top of the first-stage boosting block supporting seat (21), the guide groove (31) is of a rectangular structure, one side of the guide groove is parallel to the central axis of the motor shaft (2), and the other side of the guide groove is perpendicular to the central axis of the motor shaft (2);

the brake caliper (15) is of a bilaterally symmetrical structure, and a second piston mounting through hole (39) is formed in the middle of the brake caliper;

the rear end surface (A2) of the brake caliper is fixedly connected with the front end surface (C1) of the force-increasing mechanism shell;

the central axes of a first piston mounting through hole (30) of the force-increasing mechanism shell (6) and a second piston mounting through hole (39) on the brake caliper (15) are superposed, and the radiuses of the first piston mounting through hole and the second piston mounting through hole are equal;

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 (50);

the first-stage force-increasing block (7) is of a cuboid structure, a spiral groove through hole (45) with the central axis vertical to the plane is arranged on the end face (A3) of the motor side of the first-stage force-increasing block, the spiral groove through hole (45) is matched with a spiral groove (42) on the screw rod (23) to form a ball channel, and the ball (22) is arranged between the two to form a ball screw mechanism; the bottom of the first-stage boosting block (7) is provided with a guide lug (46) with a rectangular section, the guide lug (46) is matched with a guide groove (31) on a 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 (44), the bottoms of the rectangular through grooves (44) are parallel to the upper and lower planes of the first-stage boosting block (7), and the longitudinal symmetry lines of the grooves are parallel to each other;

the upper end surface and the lower end surface of the second-stage boosting block (8) are parallel to each other, each side surface is perpendicular to the upper end surface and the lower end surface of the second-stage boosting block (8), the lower end surface of the second-stage boosting block (8) is provided with lugs (48) which are equal to the rectangular through grooves (44) at the top of the first-stage boosting block (7) in number and correspond to the positions of the rectangular through grooves one by one, and each lug (48) is embedded into the corresponding rectangular through groove (44) and can move back and forth in the rectangular; a circular through hole (47) with a central axis perpendicular to the left end face (A4) of the second-stage force-increasing block is arranged on the left end face (A4), a cylindrical guide rail (9) penetrates through the circular through hole (47), the second-stage force-increasing block (8) can move axially along the cylindrical guide rail (9), a first inclined plane (B4) of the second-stage force-increasing block and a second inclined plane (C4) of the second-stage force-increasing block are respectively contacted with the first cylindrical roller (20) and the second cylindrical roller (50), 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 main body of the piston (11) is of a circular ring structure, the section of the main body is rectangular, the front end face (A5) of the piston is used for fixedly connecting a first friction plate (14), and the rear end face (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 (49) and a fourth cylindrical roller support (51); 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 (50) are respectively supported between the third cylindrical roller support (49) and the fourth cylindrical roller support (51) through bearings; the central axes of the first cylindrical roller (20) and the second cylindrical roller (50) 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 always in contact with the first inclined surface (B4) of the second-stage force-increasing block, and the second cylindrical roller (50) is always in contact with the second inclined surface (C4) of the second-stage force-increasing block; during the whole movement process, the two contact lines are parallel to each other and are perpendicular to the central axis of the circular through hole (47), and the plane of the two contact lines is perpendicular to the axis of the motor and is parallel to the plane opposite to the first inclined surface (B4) and the second inclined surface (C4) of the second-stage force-increasing block.

2. The rotary motor and ball screw based one-way two-stage boosting type electromechanical brake actuator as claimed in claim 1, wherein: and a first annular groove (37) and a second annular groove (38) are sequentially arranged on the second piston mounting through hole (39) along the direction from the first friction plate (14) to the force-increasing mechanism shell (6), the first annular groove (37) is used for mounting a dust ring (13), and the second annular groove (38) 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 braking actuator based on a rotating motor and a ball screw.

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), 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; as described in the EMB-based decoupled braking energy recovery system research [ J ] in 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, and the research on the electromechanical braking system becomes the object of the research on the automobile braking system again.

The invention provides an electromechanical brake actuator with a brand new structure on the basis of the previous research, which can effectively reduce the volume of the electromechanical brake actuator and effectively meet the braking requirements of large vehicles.

Disclosure of Invention

The invention provides a one-way two-stage boosting type electromechanical brake actuator based on a rotating motor and a ball screw, which adopts the technical scheme that:

the utility model provides a one-way doublestage reinforcement formula electromechanical braking executor based on rotating electrical machines and ball, its characterized in that: the device mainly comprises an installation base body, a motor, a motion conversion device and a two-stage force increasing mechanism.

The motor (1) is a rotating motor, and an external spline is arranged on a motor shaft (2).

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

The motor shaft (2) penetrates through a motor shaft through hole (25) in the end cover (4) and then is connected with the inner spline on the screw rod (23) in a matching mode.

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 (30) is formed in the inner end face (B1) of the force-increasing mechanism shell.

A first cylindrical guide rail support (32) and a second cylindrical guide rail support (36) are fixedly installed on two sides of a first piston installation through hole (30) on the inner end face (B1) of the force-increasing mechanism shell, a cylindrical guide rail (9) is fixedly installed between the first cylindrical guide rail support (32) and the second cylindrical guide rail support (36), and the cylindrical guide rail (9) is parallel to the upper end face 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 mounted at the bottom of the inner side of the boosting mechanism shell (6), a guide groove (31) is formed in the top of the first-stage boosting block supporting seat (21), the guide groove (31) is of a rectangular structure, one side of the guide groove is parallel to the central axis of the motor shaft (2), and the other side of the guide groove is perpendicular to the central axis of the motor shaft (2).

The brake caliper (15) is of a bilateral symmetry structure, and a second piston mounting through hole (39) is formed in the middle.

And a first annular groove (37) and a second annular groove (38) are sequentially arranged on the second piston mounting through hole (39) along the direction from the first friction plate (14) to the force-increasing mechanism shell (6), the first annular groove (37) is used for mounting a dust ring (13), and the second annular groove (38) is used for mounting a sealing ring (12).

The rear end surface (A2) of the brake caliper is fixedly connected with the front end surface (C1) of the force-increasing mechanism shell.

The central axes of the first piston mounting through hole (30) of the force-increasing mechanism shell (6) and the second piston mounting through hole (39) on the brake caliper (15) are overlapped and have the same radius.

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 (50).

The first-stage force-increasing block (7) is of a cuboid structure, a spiral groove through hole (45) with the central axis vertical to the plane is arranged on the end face (A3) of the motor side of the first-stage force-increasing block, the spiral groove through hole (45) is matched with a spiral groove (42) on the screw rod (23) to form a ball channel, and the ball (22) is arranged between the two to form a ball screw mechanism; the bottom of the first-stage boosting block (7) is provided with a guide lug (46) with a rectangular section, the guide lug (46) is matched with a guide groove (31) on a 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 (44), the bottoms of the rectangular through grooves (44) are parallel to the upper and lower planes of the first-stage boosting block (7), and the longitudinal symmetry lines of the grooves are parallel to each other.

The upper end surface and the lower end surface of the second-stage boosting block (8) are parallel to each other, each side surface is perpendicular to the upper end surface and the lower end surface of the second-stage boosting block (8), the lower end surface of the second-stage boosting block (8) is provided with lugs (48) which are equal to the rectangular through grooves (44) at the top of the first-stage boosting block (7) in number and correspond to the positions of the rectangular through grooves one by one, and each lug (48) is embedded into the corresponding rectangular through groove (44) and can move back and forth in the rectangular; a circular through hole (47) with a central axis perpendicular to the left end face (A4) of the second-stage force-increasing block is arranged on the left end face (A4) of the second-stage force-increasing block, a cylindrical guide rail (9) penetrates through the circular through hole (47), the second-stage force-increasing block (8) can move axially along the cylindrical guide rail (9), a first inclined face (B4) of the second-stage force-increasing block and a second inclined face (C4) of the second-stage force-increasing block are respectively in contact with a first cylindrical roller (20) and a second cylindrical roller (50), the first inclined face (B4) of the second-stage force-increasing block and the second inclined face (C4) of the second-stage force-.

The main body of the piston (11) is of a circular ring structure, the section of the main body is rectangular, the front end face (A5) of the piston is used for fixedly connecting a first friction plate (14), and the rear end face (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 (49) and a fourth cylindrical roller support (51); 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 (50) are respectively supported between the third cylindrical roller support (49) and the fourth cylindrical roller support (51) through bearings; the central axes of the first cylindrical roller (20) and the second cylindrical roller (50) are parallel to each other and to the rear end face (B5) of the piston.

When the braking force is not 0, the first cylindrical roller (20) is always in contact with the first inclined surface (B4) of the second-stage force-increasing block, and the second cylindrical roller (50) is always in contact with the second inclined surface (C4) of the second-stage force-increasing block; in the whole movement process, the two contact lines are parallel to each other and perpendicular to the central axis of the circular through hole (47), 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 two inclined planes.

Compared to conventional braking system solutions: according to the scheme, all functions of traditional braking can be realized through the traditional rotating electric machine 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 rotating motor, a motion conversion device and a two-stage force-increasing mechanism, and is an electronic mechanical brake actuator with a brand new structure; under the same volume, the scheme has larger reinforcement effect; in addition, this scheme adopts rotating electrical machines and ball as braking actuating mechanism, can satisfy the demand of many models of type, especially can effectively satisfy the big problem of large-scale vehicle braking force demand.

Drawings

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

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 screw structure view.

Fig. 12 is a three-dimensional structure diagram of the first-stage force-increasing block (7) of the two-stage force-increasing mechanism.

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

Fig. 14 is a plan view of the first-stage force-increasing block (7) of the two-stage force-increasing mechanism.

Fig. 15 is a three-dimensional structure diagram of a two-stage force-increasing block (8) of the two-stage force-increasing mechanism.

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

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

Fig. 18 is a bottom view of the two-stage force increasing block (8) of the two-stage force increasing mechanism.

Fig. 19 is a three-dimensional structural view of the piston (11) of the two-stage force amplification mechanism.

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

Fig. 21 is a front view of the dual stage force amplifier piston (11).

Fig. 22 is a force-increasing principle schematic diagram of the double-stage force-increasing mechanism.

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

Fig. 24 is an exploded view of the three-dimensional structure of the stent.

Fig. 25 is a front view of the stent.

Fig. 26 is a cross-sectional view of a stent.

Fig. 27 is a top view of the bracket mounting.

Fig. 28 is a three-dimensional view of the 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 ball bearing; 23. a lead screw; 24. a first motor fixing threaded hole; 25. a motor shaft through hole; 26. the second motor fixes the threaded hole; 27. the first end cover is fixed with the threaded hole; 28. a first support bar; 29. a first support rod connection hole; 30. a first piston mounting through-hole; 31. a guide groove; 32. a first cylindrical guide rail support; 33. the second end cover is fixedly threaded; 34. a second support bar connection hole; 35. a second support bar; 36. a second cylindrical guide rail support; 37. a first annular groove; 38. a second annular groove; 39. a second piston mounting through hole; 40. a first cylindrical guide rail mounting hole; 41. a second cylindrical guide rail mounting hole; 42. a helical groove; 43. an inner splined bore; 44. a rectangular through groove; 45. a spiral groove through hole; 46. a guide projection; 47. a circular through hole; 48. a bump; 49. a third cylindrical roller support; 50. a second cylindrical roller; 51. a fourth cylindrical roller support; 52. a piston central bore; 53. a bracket first mounting threaded hole; 54. a first support arm; 55. a second support arm; 56. a second mounting threaded hole of the bracket; 57. the first bracket hub is fixedly threaded; 58. the bracket fixes the cross rod; 59. the second bracket hub is fixed with a threaded hole; 60. a bracket first bolt; 61. 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. 12: a3, the motor side end face (front end face) of the first-stage force-increasing block.

In FIGS. 15 to 18 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, second inclined surface of the second-stage force-increasing block.

In FIGS. 19 to 20: a5, the front end face of the piston; b5, piston rear end face.

In fig. 22: a6, piston center axis; b6, the center line of the groove of the first-stage force-increasing block or the center line of the convex block of the second-stage force-increasing block; alpha, the included angle between the central axis A6 of the piston and the central line B6 of the groove of the first-stage force increasing block; beta, 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 form an included angle with the central axis A6 of the piston.

In FIGS. 23-24: 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 boosting type electromechanical brake actuator based on a rotating motor and a ball screw, and in order to make the technical scheme and the effect of the invention clearer and more definite, the invention is further described in detail by referring to the attached drawings and taking examples; 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 unidirectional two-stage boosting electromechanical brake actuator based on a rotating motor and a ball screw mainly comprises an installation base body, a motor, a motion conversion device and a two-stage boosting mechanism.

The motor (1) is a rotating motor, and an external spline 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. 1, 3 and 11, after passing through the motor shaft through hole (25) in the end cover (4), the motor shaft (2) is in fit connection with an internal spline in an internal spline hole (43) in the lead screw (23).

As shown in FIG. 2, 8 first motor fixing threaded holes (24) are formed in the boss at the end of the motor (1), the first motor fixing threaded holes (24) mainly play a role in 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 (25), 8 second motor fixing threaded holes (26) and 11 first end cover fixing threaded holes (27); the second motor fixing threaded holes (26) mainly play a role in fixing the motors, the number of the second motor fixing threaded holes is not limited to 8, and the second motor fixing threaded holes can be increased or decreased according to actual installation conditions; the first end cover fixing threaded holes (27) are used for fixing end covers, 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 4-12, 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 (33) matched with the first end cap fixing threaded hole (27) 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 to 6, a first piston mounting through hole (30) is provided on an inner end surface (B1) of the force increasing mechanism case.

As shown in fig. 4-10, a first cylindrical guide rail support (32) and a second cylindrical guide rail support (36) are fixedly mounted on two sides of a first piston mounting through hole (30) 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 (32) and the second cylindrical guide rail support (36), 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 mounted at the bottom of the inner side of the boosting mechanism shell (6), a guide groove (31) is formed in the top of the first-stage boosting block supporting seat (21), the guide groove (31) is of a rectangular structure, one side of the guide groove is parallel to the central axis of the motor shaft (2), and the other side of the guide groove is perpendicular to the central axis of the motor shaft (2).

As shown in fig. 7 to 10, the brake caliper (15) has a bilaterally symmetrical structure, and a second piston mounting through hole (39) is provided in the middle.

As shown in fig. 5 to 6, a first annular groove (37) and a second annular groove (38) are sequentially formed in the second piston mounting through hole (39) along the direction from the first friction plate (14) to the force increasing mechanism shell (6), the first annular groove (37) is used for mounting the dust ring (13), and the second annular groove (38) is used for mounting the sealing ring (12).

As shown in fig. 5-6 and 9-10, the rear end surface (a2) of the brake caliper is fixedly connected with the front end surface (C1) of the force-increasing mechanism shell; the central axes of the first piston mounting through hole (30) of the force-increasing mechanism shell (6) and the second piston mounting through hole (39) on the brake caliper (15) are overlapped and have the same radius.

As shown in fig. 7-9, a first support rod (28) and a second support rod (35) are symmetrically arranged on the left and right sides of the outside of the brake caliper (15), a first support rod connection hole (29) is formed in the first support rod (28), and a second support rod connection hole (34) is formed in the second support rod (35).

As shown in fig. 1 and 12-22, 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 (50).

As shown in fig. 12-14, the first-stage force-increasing block (7) is a cuboid structure, a spiral groove through hole (45) with a central axis perpendicular to the plane is arranged on the motor side end face (a3) of the first-stage force-increasing block, the spiral groove through hole (45) is matched with a spiral groove (42) on the screw rod (23) to form a ball passage, and the ball (22) is arranged between the two to form a ball screw mechanism; the bottom of the first-stage boosting block (7) is provided with a guide lug (46) with a rectangular section, the guide lug (46) is matched with a guide groove (31) on a 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 force-increasing block (7) is provided with more than 2 rectangular through grooves (44), the bottoms of the rectangular through grooves (44) are parallel to the upper and lower planes of the first-stage force-increasing block (7), the longitudinal symmetry lines of the grooves are parallel to each other, the symmetry center plane in the length direction and the central axis of the motor shaft (2) form an angle alpha, and the angle alpha is also the included angle between the piston axis A6 and the groove symmetry center line B6, as shown in figure 22.

As shown in fig. 15-18, 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 thereof, the lower end face of the second-stage force-increasing block (8) is provided with lugs (48) which are equal to the rectangular through grooves (44) at the top of the first-stage force-increasing block (7) in number and correspond to each other in position one by one, and each lug (48) is embedded into the corresponding rectangular through groove (44) and can move back and forth in the rectangular through groove (44).

A circular through hole (47) with a central axis vertical to the left end face (A4) of the second-stage force-increasing block is arranged on the left end face (A4) of the second-stage force-increasing block, a cylindrical guide rail (9) penetrates through the circular through hole (47), the second-stage force-increasing block (8) can move axially along the cylindrical guide rail (9), a first inclined face (B4) and a second inclined face (C4) of the second-stage force-increasing block are respectively contacted with a first cylindrical roller (20) and a second cylindrical roller (50), the first inclined face (B4) and the second inclined face (C4) of the second-stage force-increasing block are two inclined faces with the same shape and are parallel to each other, the inclined faces are vertical to the upper end face and the lower end face, a beta angle is formed between the first inclined face (B4) and the second inclined face (C4) of the second-stage force-increasing block and the central axis of the motor shaft (2), and the beta angle is also the included angle between the first inclined face, as shown in fig. 22.

As shown in fig. 19-21, 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 (49) and a fourth cylindrical roller support (51); 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 (50) are respectively supported between the third cylindrical roller support (49) and the fourth cylindrical roller support (51) through bearings; the central axes of the first cylindrical roller (20) and the second cylindrical roller (50) are parallel to each other and to the rear end face (B5) of the piston.

When the braking force is not 0, as shown in fig. 22, the first cylindrical roller (20) is always in contact with the first inclined surface (B4) of the second-stage force-increasing block, and the second cylindrical roller (50) is always in contact with the second inclined surface (C4) of the second-stage force-increasing block; in the whole movement process, the two contact lines are parallel to each other and are perpendicular to the central axis of the circular through hole (47), and the plane where the two contact lines are located is perpendicular to the axis of the motor and is parallel to the plane opposite to the first inclined surface (B4) and the second inclined surface (C4) of the second-stage force-increasing block.

As shown in fig. 23 to 27, the bracket is composed of a first bracket arm (54), a brake caliper limiting cross bar (16), a second bracket arm (55) and a bracket fixing cross bar (58), and the first bracket arm (54), the brake caliper limiting cross bar (16) and the second bracket arm (55) are all of a cuboid structure.

As shown in fig. 23 to 24, a bracket first mounting threaded hole (53) is formed in the length direction of the first bracket arm (54), and the central axis of the bracket first mounting threaded hole (53) is perpendicular to the front end surface (G7) of the first bracket arm; a second bracket mounting threaded hole (56) is formed in the length direction of the second bracket arm (55), and the central axis of the second bracket mounting threaded hole (56) is perpendicular to the front end face (D7) of the second bracket arm; the first bracket arm (54) is fixedly connected with a brake caliper limiting surface (A7) of a brake caliper limiting cross bar (16) through an end surface opposite to the front end surface (G7) of the first bracket arm; the second bracket arm (55) 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 (55) is positioned on the left end face (B7) side of the brake caliper limiting cross bar, and the first bracket arm (54) is positioned at one end opposite to the end face (B7); the three components form a U-shaped bracket; the bracket fixing cross rod (58) is of a U-shaped structure, a first bracket hub fixing threaded hole (57) and a second bracket hub fixing threaded hole (59) which are vertical to the front end face (I7) in the central axis are symmetrically formed in 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 (57), the second bracket hub fixing threaded hole (59) and a bolt; the second bracket arm (55) 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 (54) is fixedly connected with the upper end surface (F7) of the second bracket fixed cross bar 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. 23.

As shown in fig. 27, the first support rod connection hole (29) corresponds to the bracket second mounting threaded hole (56) and is fixedly connected with the actuator housing through a bracket second bolt (61); the second support rod connecting hole (34) corresponds to the first mounting threaded hole (53) of the support and is fixedly connected with the actuator shell through a first bolt (60) of the support.

The working principle of the one-way two-stage boosting type electromechanical brake actuator based on the rotating motor and the ball screw is as follows:

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) rotates, the lead screw (23) is driven to rotate through the spline, the lead screw (23) drives the first-stage boosting block (7) to move forwards through the ball (22), the first-stage boosting block (7) can only do translational motion under the supporting and limiting effects of the guide lug (46) and the guide groove (31), the rectangular through groove (44) on the first-stage boosting block (7) pushes the second-stage boosting block (8) to move through the lug (48) on the second-stage boosting block (8), the second-stage boosting block (8) cannot move forwards and backwards but only moves leftwards and rightwards under the limiting effect 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, namely, the first inclined plane (B4) of the second inclined plane (C4) of the second-stage boosting block both move rightwards, correspondingly, the piston (11) is pushed to move through the first cylindrical roller (20) and the second cylindrical roller (50), under the limiting action of the first piston mounting through hole (30) and the second piston mounting through hole (39), 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), the whole actuator moves towards the motor side under the reverse action of positive pressure applied to the brake disc (18) by the first friction plate (14), so that the second friction plate (17) is pressed to 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 controls the magnitude of the motor torque output by the motor (1) through the opening degree of the brake pedal, so that the adjustment of the magnitude of the brake force can be realized.

The process of brake release is as follows:

when a driver looses a brake pedal, the motor (1) is electrified, the motor shaft (2) rotates, the lead screw (23) is driven to rotate through the spline, the lead screw (23) drives the first-stage boosting block (7) to move backwards through the ball (22), the first-stage boosting block (7) can only do translational motion under the limiting action of the guide lug (46) and the guide groove (31), the rectangular through groove (44) on the first-stage boosting block (7) pulls the second-stage boosting block (8) to move through the lug (48) on the second-stage boosting block (8), the second-stage boosting block (8) can not move forwards and backwards but only move leftwards and rightwards under the supporting and limiting action of the cylindrical guide rail (9), when the first-stage boosting block (7) correspondingly moves backwards, the second-stage boosting block (8) can only move leftwards, namely, the first inclined surface (B4) of the second inclined surface (C4) of the second-stage boosting block both move leftwards, the pressure applied to the piston (11), namely the pressure applied to the brake disc, is correspondingly reduced through the first cylindrical roller (20) and the second cylindrical roller (50), and after the pressure applied to the piston (11) by the motor (1) is reduced to 0, the first friction plate (14) and the second friction plate (17) are separated from the brake disc (18) under the rotation motion of the brake disc, and the braking pressure applied to the brake disc is reduced to 0.