Dry-type electro-mechanical braking (EMB) system

Abstract

The invention discloses a dry type electronic mechanical braking EMB system, and belongs to the technical field of automobile braking. Comprising a brake assembly and a driving assembly, the brake assembly comprises a brake disc, two brake pads and connecting pieces connecting the two brake pads to the two sides of the brake disc, each connecting piece comprises a mounting cylinder and a linkage rod, one end of each mounting cylinder is located on the outer side of one brake pad, and the other end of each mounting cylinder is located on the corresponding linkage rod. The driving assembly comprises a hollow motor, a planetary gear structure and a driving disc which are sequentially connected, the planetary gear structure is used for connecting the driving disc to the hollow motor, a connecting frame is arranged between the driving assembly and the braking assembly, and the driving rod assembly is fixed to the braking assembly through the connecting frame. A force transmission rod is arranged in the middle of the driving disc, one end of the force transmission rod is fixed to the driving disc, and the other end of the force transmission rod is inserted into a limiting hole in the end of the screw. According to the technical scheme, the problem that in the prior art, a hydraulic brake system has defects in use is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile braking, and in particular relates to a dry type electronic mechanical braking (EMB) system. Background Art

[0002] The existing automobile braking system is mainly based on EHB (hydraulic electric brake), but most of the hydraulic components are still retained and electro-hydraulic control is adopted. This leads to slow braking response and imprecise braking force control, and the braking accuracy and response time required for high-level assisted driving cannot be met. As a non-fully decoupled system, it is impossible to fully coordinate the regenerative braking of new energy vehicles and achieve complete braking energy recovery. At the same time, there are problems such as complex pipeline layout and deterioration and leakage of brake fluid. The braking pressure generated by the brake master cylinder is transmitted to the slave cylinder piston through the oil pipe to apply pressure to the brake pad to generate braking force. This system involves many external components, and the parts have high requirements and complicated maintenance. There is a risk of damage to the exposed oil pipeline. Improper handling of brake fluid pollutes the environment. It does not support the precise control and response speed required for high-level assisted driving. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a dry electromechanical brake (EMB) system to solve the problem that the hydraulic brake system in the prior art is insufficient in use.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention discloses a dry electronic mechanical brake (EMB) system, comprising a brake assembly and a drive assembly, wherein the brake assembly comprises a brake disc, two brake pads and a connecting piece connecting the two brake pads to both sides of the brake disc, wherein the connecting piece comprises a mounting tube and a linkage rod, wherein one end of the mounting tube is located on the outside of one brake pad, the linkage rod is fixedly connected to the outer surface of the other end of the mounting tube, the mounting tube is closed and arranged toward one end of the brake pad, a piston tube is arranged inside the mounting tube, the piston tube is slidably connected in the mounting tube, and the rotational freedom of the piston tube is limited by the inner wall of the mounting tube, a nut is slidably arranged inside the piston tube, the rotational freedom of the nut is limited by the inner wall of the piston tube, a screw rod threadedly connected thereto is arranged inside the nut, the screw rod passes through the end of the mounting tube toward one end of the linkage rod, and a limiting hole is arranged on the end of the screw rod, a retaining ring is arranged on the outer side surface of the limiting hole, the retaining ring is fixed to the outer side surface of the screw rod, and the retaining ring abuts against the inner side surface of the end of the mounting tube;

[0006] The driving assembly includes a hollow motor, a planetary gear structure and a driving disk connected in sequence, the planetary gear structure is used to connect the driving disk to the hollow motor, a connecting frame is provided between the driving assembly and the brake assembly, the connecting frame fixes the driving rod assembly to the brake assembly, a force transmission rod is provided in the middle of the driving disk, one end of the force transmission rod is fixed to the driving disk, and the other end of the force transmission rod is inserted into the limiting hole at the end of the screw rod.

[0007] Furthermore, the planetary gear structure is nested inside the motor housing of the hollow motor, and the planetary gear structure includes a planetary carrier, three planetary gears, a sun gear, a ring gear and a fixed end plate. The sun gear is arranged on the output shaft of the hollow motor. A mounting shell is provided on the outside of the hollow motor, and the hollow motor is located inside the mounting shell. An end shell is provided at a point of the mounting shell, and the end shell is fixed on the mounting shell. The fixed end plate is located in the middle of the end shell and is flush with the outer side surface of the end shell.

[0008] Furthermore, a rotating bearing is provided on the inner side surface of the end shell, and the rotating bearing is sleeved on the fixed end plate.

[0009] Furthermore, a thrust bearing is provided on the surface of the installation tube that contacts the retaining ring, the thrust bearing is connected to the inner side surface of the end of the installation tube, and the end of the screw rod passes through the middle of the thrust bearing.

[0010] Furthermore, the planet carrier includes an annular base plate, and mounting columns and fixed blocks are circumferentially arranged on the surface of the annular base plate. The middle part of the planetary gear is rotatably sleeved on the mounting columns, and the fixed end plate is fixed on the fixed block.

[0011] Furthermore, an annular groove is provided on the outer side surface of one end of the piston cylinder facing the brake pad, and an annular cavity is provided from the end surface to the inside of the one end of the mounting cylinder facing the annular groove, and a closed tube is provided in the annular cavity, and the closed tube is slidably connected in the annular cavity, and a plurality of arc plates are provided on the end of the closed tube facing the annular groove. When the plurality of arc plates move toward the middle of the closed tube to the extreme position, the plurality of arc plates form a circular ring, and the inner ring of the circular ring abuts against the surface of the annular groove. When the arc plate moves outward to the extreme position, the end of the arc plate facing the annular groove is located above the annular groove.

[0012] Furthermore, a slidingly connected L-shaped rod is provided on the outer side of the closed tube, one end of the L-shaped rod is fixed to the arc plate, the other end of the L-shaped rod passes through the closed tube and is located outside the closed tube, and a stopper is provided on the end of the L-shaped rod located outside the closed tube, and an elastic rope is provided on the outer side of the L-shaped rod, and the elastic rope clamps a plurality of stoppers to the outer side of the closed tube.

[0013] Furthermore, a groove matching the elastic rope is provided on the contact portion between the stopper and the elastic rope.

[0014] Furthermore, a plurality of drainage holes are provided at the lowest position of the closed pipe.

[0015] The beneficial effects of the present invention are:

[0016] (1) Compact structure: The hollow motor is nested in a planetary gear speed reduction and torque increase mechanism, which greatly reduces the longitudinal dimensions, facilitates wheel installation and layout, and reduces the unsprung mass. (2) Precise control: The EMB system realizes independent control of the braking torque of each wheel, improving the braking accuracy and response speed. (3) Easy maintenance: The hydraulic oil and pipelines in the hydraulic brake system are removed, reducing maintenance costs and complexity, and greatly extending the maintenance cycle. (4) Environmentally friendly: The brake pads and brake discs are completely separated during driving, which reduces the friction and wear of the brake pads. The complete use of brake oil reduces the impact on the environment. (5) High integration: The high degree of integration of the system is conducive to vehicle design, saves space, reduces the use of peripheral components, reduces manufacturing costs, reduces system weight, and improves vehicle performance. (6) Supports autonomous driving: The EMB system's rapid response and precise control provide strong support for autonomous driving.

[0017] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0019] Figure 1 It is a three-dimensional schematic diagram of the dry electronic mechanical brake system of the present invention;

[0020] Figure 2 It is a schematic diagram of an exploded view of a dry electromechanical brake system of the present invention;

[0021] Figure 3 It is a three-dimensional schematic diagram of the brake assembly part of the present invention;

[0022] Figure 4 It is a schematic diagram of an exploded view of a brake assembly part of the present invention;

[0023] Figure 5 It is a schematic diagram of an exploded view of the drive assembly part of the present invention;

[0024] Figure 6It is a schematic cross-sectional view of the front view of the dry electronic mechanical brake system of the present invention;

[0025] Figure 7 It is a three-dimensional schematic diagram of the sealing tube of the present invention installed on the piston cylinder;

[0026] Figure 8 It is a three-dimensional schematic diagram of the sealing tube of the present invention being arranged on the mounting tube;

[0027] Fig. 9 It is a schematic cross-sectional view of the sealing tube of the present invention acting in the annular groove.

[0028] The following are marked in the accompanying drawings:

[0029] 1. Motor housing; 2. Winding; 3. Sun gear; 4. Annular base plate; 5. Mounting column; 6. Fixed block; 7. Ring gear; 8. Planetary gear; 9. Fixed end plate; 10. Rotating bearing; 11. End housing; 12. Connecting frame; 13. Drive plate; 14. Force transmission rod; 15. Screw; 16. Nut; 17. Piston cylinder; 18. Brake pad; 19. Mounting cylinder; 20. Thrust bearing; 21. Retaining ring; 22. Brake disc; 23. Connecting piece; 24. Mounting housing; 25. Annular cavity; 26. Closing tube; 27. Annular groove; 28. Block; 29. ​​L-shaped rod; 30. Arc plate; 31. Elastic rope; 32. Drain hole. DETAILED DESCRIPTION

[0030] like Figure 1 to Figure 6As shown, a dry electronic mechanical brake EMB system of the present invention includes a brake assembly and a drive assembly, wherein the brake assembly includes a brake disc 22, two brake pads 18, and a connector 23 connecting the two brake pads 18 to both sides of the brake disc 22. It should be noted that the connection method of the brake disc 22, the brake pad 18 and the connector 23 of the brake assembly is the prior art, which will not be described in detail herein. The connector 23 in the present technical solution includes a mounting tube 19 and a connecting rod, one end of the mounting tube 19 is located on the outside of a brake pad 18, and the connecting rod is fixedly connected to the outer surface of the other end of the mounting tube 19, which can be an integrated design connection, and the mounting tube 19 is closed toward one end of the brake pad 18, and a friction groove for increasing friction is provided on its closed end. It is not difficult to understand that a mounting back plate is provided on the back of the brake pad 18, and the end of the mounting tube 19 is abutted against the mounting back plate. A piston cylinder 17 is provided inside the mounting cylinder 19, and the piston cylinder 17 is slidably connected in the mounting cylinder 19, and the rotational freedom of the piston cylinder 17 is limited by the inner wall of the mounting cylinder 19. The specific method of limitation can be that the inner surface of the mounting cylinder 19 is provided with a ridge, and the outer surface of the piston cylinder 17 is provided with a groove, and the groove is slidably connected to the ridge, and a nut 16 is slidably provided inside the piston cylinder 17, and the rotational freedom of the nut 16 is limited by the inner wall of the piston cylinder 17, and the nut 16 is provided with a screw 15 threadedly connected thereto. It should be noted that the nut 16 and the screw 15 here can adopt a ball screw assembly, and the screw 15 is arranged through the end of the mounting cylinder 19 toward one end of the connecting rod, and a limiting hole is provided on the end of the screw 15, and a retaining ring 21 is provided on the outer side surface of the limiting hole, and the retaining ring 21 is fixed to the outer side surface of the screw 15, and the retaining ring 21 abuts against the inner side surface of the end of the mounting cylinder 19;

[0031] The driving assembly includes a hollow motor, a planetary gear 8 structure and a driving disk 13 connected in sequence. The hollow motor is a prior art and includes components such as a winding 2 and a rotating shaft (output shaft). The planetary gear 8 structure is used to connect the driving disk 13 to the output end of the hollow motor. A connecting frame 12 is provided between the driving assembly and the braking assembly. The connecting frame 12 fixes the driving rod assembly to the braking assembly. A force transmission rod 14 is provided in the middle of the driving disk 13. One end of the force transmission rod 14 is fixed to the driving disk 13, and the other end of the force transmission rod 14 is inserted into the limiting hole at the end of the screw 15.

[0032] The working principle of the above technical solution is:

[0033] When the hollow motor drives the planetary gear 8 structure to rotate, and then drives the driving plate 13 connected thereto to rotate, the rotation of the driving plate 13 drives the power transmission rod 14 to rotate, and then drives the screw 15 to rotate. Since the rotation of the nut 16 is restricted, the rotation of the screw 15 will drive the nut 16 to move in the piston cylinder 17, and the end of the linearly moving nut 16 abuts against the piston cylinder 17, thereby pushing the piston cylinder 17 to press against the brake pad 18, and then driving the brake pad 18 on one side to press against the brake disc 22. When the brake pad 18 on this side is pressed tightly, the linear motion of the nut 16 is blocked, which is equivalent to the position of the nut 16 being fixed. At this time, the continued rotation of the screw 15 will cause the screw 15 to extend outward relative to the nut 16, thereby pressing the end of the retaining ring 21 and the mounting cylinder 19, thereby driving the connecting member 23 to move backward, and then the connecting member 23 pulls the brake pad 18 on the other side to move backward, thereby making the brake pad 18 on the other side close to the brake disc 22, thereby achieving a close fit between the brake pads 18 on both sides and the brake disc 22;

[0034] It should be noted that the setting of the planetary gear 8 structure can realize the operations of reducing the speed and increasing the torque of the output shaft of the hollow motor, ensuring that the force applied by the hollow motor meets the braking requirements. At the same time, the hollow motor can be understood as a hollow cup motor. The difference between it and an ordinary motor is mainly reflected in the fact that its rotor adopts an iron coreless design and has a hollow cup structure. Therefore, a hollow motor is used to nest the planetary gear 8 torque increasing mechanism inside the hollow motor to achieve high space utilization, strong integrity, and sufficient braking force.

[0035] This technical solution does not rely on the brake master cylinder and hydraulic circuit to form braking force, and completely abandons the oil circuit and corresponding accessories required by the traditional system. During braking, the motor drives the planetary gear 8 group to achieve torque amplification, and then the rotational motion is converted into linear motion through the screw 15 mechanism to push the brake pad, thereby pressing the brake disc 22 to form braking force.

[0036] At the same time, the vehicle is equipped with four complete and independent braking systems, which work in coordination with each other, increase failure redundancy, and greatly improve safety. When a problem occurs in a traditional hydraulic system, the hydraulic circuit fails and the oil pressure cannot be established, and the entire system fails. This solution can achieve complete decoupling of the brake pedal. The further development of intelligent driving has put forward higher requirements for the braking system. At the same time, more efficient regenerative braking energy recovery strategies have also put forward the need for full decoupling of the braking system. Traditional hydraulic braking systems cannot meet the basic requirements of high-level autonomous driving systems and regenerative braking systems for braking response time, control accuracy, integrated control and functional safety. However, as a complete form of a wire-controlled braking system, the electromechanical braking system has many advantages such as fast response speed, precise braking force control, and easy integrated control.

[0037] In one practicable manner, the planetary gear 8 structure is nested inside the motor housing 1 of the hollow motor, and the planetary gear 8 structure includes a planetary carrier, three planetary gears 8, a sun gear 3, a ring gear 7 and a fixed end plate 9. The sun gear 3 is arranged on the output shaft of the hollow motor. A mounting shell 24 is provided on the outside of the hollow motor, and the hollow motor is located inside the mounting shell 24. An end shell 11 is provided at one point of the mounting shell 24, and the end shell 11 is fixed on the mounting shell 24. The fixed end plate 9 is located in the middle of the end shell 11 and is flush with the outer side surface of the end shell 11. Specifically, the planetary carrier includes an annular base plate 4, and mounting columns 5 and fixed blocks 6 are circumferentially arranged on the surface of the annular base plate 4. The middle part of the planetary gear 8 is rotatably sleeved on the mounting column 5, and the fixed end plate 9 is fixed on the fixed block 6.

[0038] It should be noted that the specific manner in which the planetary gear 8 is nested in the hollow motor can be determined by those skilled in the art. Figure 2 Therefore, when the output shaft of the hollow motor drives the sun gear 3 to rotate, the sun gear 3 will drive the three planetary gears 8 to rotate, and the three planetary gears 8 will rotate in the ring gear 7, thereby achieving the purpose of speed reduction. At the same time, when the planetary gears 8 rotate, they will drive the planetary carrier to rotate, and then drive the fixed end plate 9 connected to the planetary carrier to rotate, and then drive the drive disk 13 connected to the fixed end plate 9 to rotate, and then drive the power transmission shaft to rotate.

[0039] In an practicable manner, a rotating bearing 10 is provided on the inner side surface of the end shell 11 , and the rotating bearing 10 is sleeved on the fixed end plate 9 to enhance the rotation effect of the fixed end plate 9 .

[0040] In one feasible manner, a thrust bearing 20 is provided on the surface where the mounting tube 19 and the retaining ring 21 abut against each other. The thrust bearing 20 is connected to the inner side surface of the end of the mounting tube 19. The end of the screw rod 15 passes through the middle of the thrust bearing 20, thereby realizing the transmission of the thrust torque and reducing the friction force when the retaining ring 21 rotates.

[0041] like Figure 7-Figure 9 As shown, it needs to be explained in advance that in the present solution, since the mounting cylinder 19 is slidably sleeved on the outer surface of the piston cylinder 17, when the brake pads 18 on both sides are clamped, the mounting cylinder 19 will slide relative to the piston cylinder 17, and the surface formed by the sliding of the two is exposed to the outside. If dust or the like adheres, or the sliding effect between the two is deteriorated, it will cause damage to key components and affect the braking effect.

[0042] Therefore, in one feasible manner, an annular groove 27 is provided on the outer side surface of one end of the piston cylinder 17 facing the brake pad 18, and an annular cavity 25 is provided from the end surface to the inside of the mounting cylinder 19 facing the annular groove 27. A closed tube 26 is provided in the annular cavity 25. The closed tube 26 is slidably connected in the annular cavity 25, and a plurality of arc plates 30 are provided on one end of the closed tube 26 facing the annular groove 27. When the plurality of arc plates 30 move toward the middle of the closed tube 26 to the extreme position, the plurality of arc plates 30 form a circular ring, and the inner ring of the circular ring abuts against the surface of the annular groove 27. When the arc plate 30 moves outward to the extreme position, the end of the arc plate 30 facing the annular groove 27 is located above the annular groove 27.

[0043] So, the above scheme works like this:

[0044] When the piston cylinder 17 is installed, the arc plate 30 is first moved up to increase the end diameter of the installation cylinder 19 to facilitate the piston cylinder 17 to enter from its end. When the installation is completed, several arc plates 30 are moved down to make the side surfaces of each arc plate 30 contact and seal so that the inner ring of the circular ring formed by them is tightly pressed against the annular groove 27. It is not difficult to understand that a certain annular sealing ring can be provided on the inner ring to further enhance the sealing effect. At the same time, the closing tube 26 can slide in the annular cavity 25, and will not interfere with the movement of the installation cylinder 19. It is also necessary to further explain that the length of the annular groove 27 can be set to be longer than the moving stroke of the piston cylinder 17 and the mounting cylinder 19. The advantage of this is that even if the surface of the closed tube 26 is covered with dust in the later stage and it is difficult to slide in the annular cavity 25, the mounting cylinder 19 can drive the closed tube 26 as a whole to slide in the annular groove 27. At this time, the sliding surfaces of the mounting cylinder 19 and the piston cylinder 17 can still be protected, and at the same time, no excessive resistance will be caused to the sliding of the two (therefore, directly fixing the end of the closed tube 26 to the end of the mounting cylinder 19 is also a dust-proof implementation method, but the sliding resistance is relatively large).

[0045] In one practicable manner, a slidingly connected L-shaped rod 29 is provided on the outer side of the closed tube 26, one end of the L-shaped rod 29 is fixed on the arc plate 30, and the other end of the L-shaped rod 29 passes through the closed tube 26 and is located outside the closed tube 26, and a stopper 28 is provided on the end of the L-shaped rod 29 located outside the closed tube 26, and an elastic rope 31 is provided on the outer side of the L-shaped rod 29, and the elastic rope 31 clamps a plurality of stoppers 28 on the outer side of the closed tube 26. This arrangement of the arc plate 30 is relatively simple, and can realize the up and down sliding of the arc block on the end of the installation tube 19, and after the installation is completed, only the elastic rope 31 is required. By winding the stopper 28, the position of the arc block can be limited. At the same time, the advantage of the elastic rope 31 is that if foreign matter (dust accumulation or fine sand and stone particles) is attached to the annular groove 27, when the arc block slides and contacts the foreign matter, it can overcome the elastic force of the elastic rope 31 and move upward under the obstruction of the foreign matter (at the same time, the outer side surface of the sealing ring is an arc surface, which can guide the upward movement of the arc plate 30 when it contacts the foreign matter), until it passes over the foreign matter and is reset under the elastic force of the elastic rope 31, thereby achieving the purpose of overcoming obstacles and avoiding the problem of the arc block being stuck when sliding in the annular groove 27.

[0046] The dustproof structure arranged in this way is not prone to fatigue damage during use. Even if the effect becomes worse in the later stage, the dust on the surface of the annular groove 27 and the sealing tube 26 can be cleaned and then continued to be reused.

[0047] In one practicable manner, a groove matching the elastic rope 31 is provided on the contact portion between the stopper 28 and the elastic rope 31 . The provision of the groove can prevent the elastic rope 31 from slipping off the surface of the stopper 28 .

[0048] In one feasible manner, a plurality of drainage holes 32 are provided at the lowest position of the closed tube 26. The setting of the drainage holes 32 can discharge the water entering the arc plate 30 and the end of the mounting cylinder 19, thereby preventing the water from entering the sliding surface of the piston cylinder 17 and the mounting cylinder 19. It is not difficult to see that there is a certain distance between the inner wall of the closed tube 26 and the inner wall of the mounting cylinder 19, that is, the entering rainwater will gather at the lower part of the closed tube 26 and be collected, and then be discharged from the drainage holes 32, and the height of the collected rainwater will not exceed the height of the distance between the inner wall of the closed tube 26 and the inner wall of the mounting cylinder 19, so it will not enter the sliding surface of the two, and will not affect the sliding surface (corrosion).

[0049] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A dry type electromechanical brake (EMB) system, characterized in that: The invention comprises a brake assembly and a drive assembly, wherein the brake assembly comprises a brake disc (22), two brake pads (18) and a connecting member (23) for connecting the two brake pads (18) to the two sides of the brake disc (22), wherein the connecting member (23) comprises a mounting tube (19) and a connecting rod, wherein one end of the mounting tube (19) is located outside a brake pad (18), and the connecting rod is fixedly connected to the outer surface of the other end of the mounting tube (19), and the mounting tube (19) is closed toward one end of the brake pad (18), and a piston tube (17) is provided inside the mounting tube (19), and the piston tube (17) is slidably connected to the mounting tube (19), and the piston The rotational freedom of the cylinder (17) is limited by the inner wall of the mounting cylinder (19); a nut (16) is slidably arranged inside the piston cylinder (17); the rotational freedom of the nut (16) is limited by the inner wall of the piston cylinder (17); a screw (15) threadedly connected thereto is arranged inside the nut (16); the screw (15) is arranged to pass through the end of the mounting cylinder (19) toward one end of the linkage rod; a limiting hole is arranged on the end of the screw (15); a retaining ring (21) is arranged on the outer side surface of the limiting hole; the retaining ring (21) is fixed on the outer side surface of the screw (15); the retaining ring (21) abuts against the inner side surface of the end of the mounting cylinder (19); The driving assembly comprises a hollow motor, a planetary gear (8) structure and a driving disk (13) connected in sequence, the planetary gear (8) structure is used to connect the driving disk (13) to the hollow motor, a connecting frame (12) is provided between the driving assembly and the brake assembly, the connecting frame (12) fixes the driving rod assembly to the brake assembly, a force transmission rod (14) is provided in the middle of the driving disk (13), one end of the force transmission rod (14) is fixed to the driving disk (13), and the other end of the force transmission rod (14) is inserted into a limiting hole at the end of a screw rod (15).

2. A dry type electromechanical brake (EMB) system according to claim 1, characterized in that: The planetary gear (8) structure is nested inside the motor housing (1) of the hollow motor. The planetary gear (8) structure comprises a planetary carrier, three planetary gears (8), a sun gear (3), a gear ring (7) and a fixed end plate (9). The sun gear (3) is arranged on the output shaft of the hollow motor. A mounting shell (24) is arranged outside the hollow motor. The hollow motor is located inside the mounting shell (24). An end shell (11) is arranged at a point of the mounting shell (24). The end shell (11) is fixed on the mounting shell (24). The fixed end plate (9) is located in the middle of the end shell (11) and is arranged flush with the outer side surface of the end shell (11).

3. A dry type electromechanical brake (EMB) system according to claim 2, characterized in that: A rotary bearing (10) is provided on the inner side surface of the end shell (11), and the rotary bearing (10) is sleeved on the fixed end plate (9).

4. A dry type electromechanical brake (EMB) system according to claim 1, characterized in that: A thrust bearing (20) is provided on the surface where the mounting tube (19) abuts against the retaining ring (21); the thrust bearing (20) is connected to the inner side surface of the end of the mounting tube (19); and the end of the screw rod (15) passes through the middle of the thrust bearing (20).

5. A dry type electromechanical brake (EMB) system according to claim 2, characterized in that: The planet carrier comprises an annular base plate (4), the surface of which is circumferentially provided with mounting columns (5) and fixing blocks (6), the middle portion of the planetary gear (8) is rotatably sleeved on the mounting columns (5), and the fixing end plate (9) is fixed on the fixing block (6).

6. A dry type electromechanical brake (EMB) system according to claim 1, characterized in that: An annular groove (27) is provided on the outer side surface of one end of the piston cylinder (17) facing the brake pad (18); an annular cavity (25) is provided from the end surface to the inside of the mounting cylinder (19) facing the annular groove (27); a closed tube (26) is provided in the annular cavity (25); the closed tube (26) is slidably connected in the annular cavity (25); a plurality of arc plates (30) are provided on one end of the closed tube (26) facing the annular groove (27); when the plurality of arc plates (30) move toward the middle of the closed tube (26) to an extreme position, the plurality of arc plates (30) form a circular ring, and the inner ring of the circular ring abuts against the surface of the annular groove (27); when the arc plate (30) moves outward to an extreme position, the end of the arc plate (30) facing the annular groove (27) is located above the annular groove (27).

7. A dry type electromechanical brake (EMB) system according to claim 6, characterized in that: An L-shaped rod (29) is provided on the outer side of the closed tube (26) in a sliding connection, one end of the L-shaped rod (29) is fixed on the arc-shaped plate (30), the other end of the L-shaped rod (29) passes through the closed tube (26) and is located outside the closed tube (26), and a stopper (28) is provided on the end of the L-shaped rod (29) located outside the closed tube (26), and an elastic rope (31) is provided on the outer side of the L-shaped rod (29), and the elastic rope (31) clamps a plurality of stoppers (28) on the outer side of the closed tube (26).

8. A dry type electromechanical brake (EMB) system according to claim 7, characterized in that: A groove matching the elastic rope (31) is provided at the contact portion between the stopper (28) and the elastic rope (31).

9. A dry type electromechanical brake (EMB) system according to claim 6, characterized in that: The closed tube (26) is provided with a plurality of drainage holes (32) at the lowest position.

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