Electronic mechanical braking device capable of being locked

Abstract

The utility model belongs to the technical field of automobile brake-by-wire, and discloses a lockable electronic mechanical brake device, which comprises a brake motor, a brake cylinder, a brake cylinder and a brake cylinder, the locking mechanism comprises a reset driving piece and a locking execution assembly, the locking execution assembly comprises a ratchet wheel, a swing rod, an elastic limiting piece and a reset transmission piece, the ratchet wheel is fixed to the output shaft, the reset transmission piece is fixed to the output end of the reset driving piece, a pawl part matched with the ratchet wheel is arranged on one side of the swing rod, and the elastic limiting piece is connected or connected with the swing rod in an abutting mode; the elastic limiting piece has the trend of driving the pawl part to abut against the ratchet wheel, and the reset driving piece can drive the swing rod to rotate through the reset transmission piece so that the pawl part can be away from the ratchet wheel. The locking mechanism of the electronic mechanical braking device capable of being locked is simple in structure, the meshing state of the swing rod and the ratchet wheel is kept through the elasticity of the elastic limiting piece, the braking state can be kept continuously, a locking driving element does not need to be additionally arranged, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive electro - mechanical braking, in particular to a lockable electro - mechanical braking device. Background Art

[0002] Under the trend of automotive electrification, more and more manufacturers use electro - mechanical braking structures with sensitive response, energy - saving and high - efficiency to replace hydraulic braking structures.

[0003] Currently, after the vehicle stops, it is necessary to step on the parking brake to drive the brake pads to squeeze the brake disc to brake the vehicle tires, thereby preventing the vehicle from moving. The electro - mechanical braking mechanism faces the problem of avoiding motor burnout during long - time braking. Therefore, the electro - mechanical braking mechanism usually sets a locking structure. The locking structures of current products on the market are complex and the cost is also high.

[0004] Therefore, there is an urgent need for a lockable electro - mechanical braking device to solve the above - mentioned technical problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a lockable electro - mechanical braking device. The locking mechanism has a simple structure. By the elasticity of the elastic limiting member itself, the meshing state of the swing rod and the ratchet wheel is maintained, so that the braking state can be continuously maintained without additionally setting a locking driving element, reducing the production cost.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Provide a lockable electro - mechanical braking device, including a housing and the following components installed on the housing:

[0008] A braking motor, provided with a rotatable output shaft;

[0009] A locking mechanism, including a reset driving member and a locking execution component. The locking execution component includes a ratchet wheel, a swing rod, an elastic limiting member and a reset transmission member. The ratchet wheel is fixed on the output shaft. The reset transmission member is fixed on the output end of the reset driving member. One end of the swing rod is rotatably connected to the housing. The other end of the swing rod is connected or abutted against the reset transmission member. A pawl portion adapted to the ratchet wheel is provided on one side of the swing rod. The elastic limiting member is connected or abutted against the swing rod, and the elastic limiting member has a tendency to drive the pawl portion to press against the ratchet wheel. The reset driving member can drive the swing rod to rotate through the reset transmission member, so that the pawl portion is away from the ratchet wheel.

[0010] Preferably, the elastic limiting member is a spring piece. One end of the elastic limiting member is fixed on the housing, and the other end of the elastic limiting member presses against the other side of the swing rod.

[0011] Preferably, a fixing pin is provided on the housing, and one end of the elastic limiting member is fixed to the fixing pin; and / or

[0012] A limit pin is arranged on the housing, and the limit pin is pressed against a side of the elastic limit member away from the swing rod, and the limit pin is used to keep the elastic limit member in a state of pressing against the swing rod.

[0013] Preferably, the reset drive member is a rotating drive member, the reset transmission member is an eccentric cam, the reset transmission member is installed on the rotating shaft of the reset drive member, the peripheral wall of the reset transmission member abuts against the side of the rocker arm where the pawl portion is provided, and the reset drive member can drive the eccentric cam to rotate around its rotating axis, and the rotating axis of the eccentric cam is parallel to the geometric center line.

[0014] Preferably, the reset drive member is a rotary motor.

[0015] Preferably, the casing includes a main shell and a fixed plate, the fixed plate is arranged at the first end of the main shell, and a first cavity and a second cavity arranged side by side and spaced apart are provided in the main shell. The fixed plate limits the installation of the brake motor in the first cavity, and limits the installation of the reset drive component in the second cavity, and the rocker arm and the elastic limit component are both installed on the fixed plate.

[0016] Preferably, the electronic mechanical braking device also includes an upper cover, a lower cover, a circuit board and wiring terminals. The brake motor, the reset drive component and the wiring terminals are all electrically connected to the circuit board. The casing forms an installation space for the brake motor and the reset drive component. At the first end of the casing, the casing and the upper cover are combined to form an installation space for the locking actuator. At the second end of the casing, the casing and the lower cover are combined to form an installation space for the circuit board. The wiring terminals are installed on the side of the lower cover facing the upper cover.

[0017] Preferably, the electronic mechanical braking device further comprises a transmission gear assembly, wherein the transmission gear assembly comprises:

[0018] A motor gear mounted on the output shaft;

[0019] A primary gear and a secondary gear, wherein the primary gear is meshed with the motor gear, and the secondary gear is meshed with the primary gear;

[0020] The input end of the planetary gear train is coaxially connected to the secondary gear, and the output end of the planetary gear train is connected to the output frame.

[0021] Preferably, the planetary gear train comprises:

[0022] The sun gear is coaxially and drivingly connected to the secondary gear;

[0023] The internal gear ring is installed on the housing;

[0024] A plurality of planet gears, the plurality of planet gears are simultaneously meshed with the sun gear and the internal gear ring, and the planet gears are drivingly connected to the output frame through planet shafts.

[0025] Preferably, the motor gear, the primary gear and the secondary gear are all helical gears.

[0026] Advantages of the present utility model:

[0027] The lockable electromechanical braking device provided by the present utility model outputs braking power through a braking motor. When braking for a long time, the locking mechanism restricts the rotation of the output shaft of the braking motor, thereby maintaining the braking execution structure in the braking position, and avoiding burning out the braking motor without the need for the braking motor to continuously output power. When braking for a long time, the elastic limiting member drives the swing rod to rotate towards the ratchet on the output shaft, so that the pawl portion presses against the ratchet, and the pawl portion meshes with the ratchet to prevent the output shaft from rotating in the direction of releasing the brake; when it is necessary to release the braking state, the reset driving member drives the swing rod to rotate in the opposite direction through the reset transmission member, so that the pawl portion disengages from the ratchet, and at this time, the output shaft of the braking motor can rotate. The locking mechanism provided by the present utility model has a simple structure, and the engagement state between the swing rod and the ratchet is maintained by the elasticity of the elastic limiting member itself, so that the braking state can be continuously maintained without additionally providing a locking driving element, reducing the production cost. Description of the drawings

[0028] Figure 1 is a schematic structural diagram of the lockable electromechanical braking device provided by the present utility model;

[0029] Figure 2 is a partial structural schematic diagram of the lockable electromechanical braking device provided by the present utility model;

[0030] Figure 3 is a state schematic diagram of the lockable electromechanical braking device provided by the present utility model in a locked state;

[0031] Figure 4 is a state schematic diagram of the lockable electromechanical braking device provided by the present utility model in a non-locked state;

[0032] Figure 5 is a sectional view of the lockable electromechanical braking device provided by the present utility model.

[0033] In the figure:

[0034] 1. Main housing; 101. First cavity; 102. Second cavity; 2. Fixed plate; 3. Braking motor; 4. Reset driving member; 5. Ratchet; 6. Swing rod; 601. Pawl portion; 7. Elastic limiting member; 8. Reset transmission member; 9. Fixed pin shaft; 10. Limit pin column; 11. Rotating pin shaft; 12. Motor gear; 13. First-stage gear; 14. Second-stage gear; 15. Sun gear; 16. Internal gear ring; 17. Planet gear; 18. Planet shaft; 19. Output bracket; 20. Planet gear baffle; 21. Upper cover; 22. Lower cover; 23. Circuit board; 24. Wiring terminal. Detailed implementation manners

[0035] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0036] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0037] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0038] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0039] This embodiment provides a lockable electromechanical braking device. The electromechanical braking device cooperates with a brake caliper and a brake disc. The brake caliper includes brake pads, and the brake pads can press against the brake disc under the drive of the electromechanical braking device to lock the tire when the vehicle is parked.

[0040] As Figures 1-5 shown, the electromechanical braking device includes a housing and a braking motor 3 and a locking mechanism mounted on the housing. Among them, the braking motor 3 is provided with a rotatable output shaft. The locking mechanism includes a reset driving member 4 and a locking execution assembly. The locking execution assembly includes a ratchet wheel 5, a swing rod 6, an elastic limiting member 7 and a reset transmission member 8. The ratchet wheel 5 is fixed to the output shaft. The reset transmission member 8 is fixed to the output end of the reset driving member 4. One end of the swing rod 6 is rotatably connected to the housing, and the other end of the swing rod 6 is connected or abutted against the reset transmission member 8. A ratchet pawl portion 601 adapted to the ratchet wheel 5 is provided on one side of the swing rod 6. The elastic limiting member 7 is connected or abutted against the swing rod 6, and the elastic limiting member 7 has a tendency to drive the ratchet pawl portion 601 to press against the ratchet wheel 5. The reset driving member 4 can drive the swing rod 6 to rotate through the reset transmission member 8 so that the ratchet pawl portion 601 moves away from the ratchet wheel 5.

[0041] The lockable electromechanical braking device provided in this embodiment outputs the power of braking through the braking motor 3. When braking for a long time, the locking mechanism restricts the rotation of the output shaft of the braking motor 3, so as to keep the braking execution structure in the braking position, and there is no need for the braking motor 3 to continuously output power to avoid burning out the braking motor 3. When braking for a long time, the elastic limiting member 7 drives the swing rod 6 to rotate towards the ratchet wheel 5 on the output shaft, so that the ratchet pawl portion 601 presses against the ratchet wheel 5, and the ratchet pawl portion 601 meshes with the ratchet wheel 5 to prevent the output shaft from rotating in the direction of releasing the brake. When it is necessary to release the braking state, the reset driving member 4 drives the swing rod 6 to rotate in the opposite direction through the reset transmission member 8, so that the ratchet pawl portion 601 disengages from the ratchet wheel 5, and at this time the output shaft of the braking motor 3 can rotate. The locking mechanism provided in this embodiment has a simple structure. By the elasticity of the elastic limiting member 7 itself, the meshing state of the swing rod 6 and the ratchet wheel 5 is maintained, and the ratchet pawl portion 601 and the ratchet wheel 5 are self-locked, so that the braking state can be continuously maintained without additionally setting a locking driving element, reducing the production cost.

[0042] Exemplarily, as Figures 1-4 shown, when the ratchet pawl portion 601 meshes with the ratchet wheel 5, the rotation of the output shaft of the braking motor 3 in the counterclockwise direction can be restricted, and this rotation direction is the power output direction for driving the brake pads away from the brake disc. At the same time, the rotation of the output shaft of the braking motor 3 in the clockwise direction, that is, the power output direction for driving the brake pads close to the brake disc, will not be restricted.

[0043] Exemplarily, as Figures 1-5As shown, the casing includes a main shell 1 and a fixed plate 2, the fixed plate 2 is arranged at the first end of the main shell 1, and a first cavity 101 and a second cavity 102 arranged side by side and spaced apart are provided in the main shell 1. The fixed plate 2 limits the brake motor 3 to be installed in the first cavity 101, and limits the reset drive member 4 to be installed in the second cavity 102, and the rocker arm 6 and the elastic limit member 7 are both installed on the fixed plate 2.

[0044] For example, Figures 1-4 As shown, the elastic limiter 7 is a spring sheet, one end of which is fixed to the fixed plate 2, and the other end of which is pressed against the other side of the rocker 6. The elastic limiter 7 has the potential energy to reset its other end in the clockwise direction, thereby continuously pressing the rocker 6 downward.

[0045] Further, such as Figures 1-4 As shown, a fixed pin shaft 9 and a rotating pin shaft 11 are provided on the fixed plate 2 , one end of the elastic limiter 7 is fixed to the fixed pin shaft 9 , and one end of the swing rod 6 is rotatably connected to the rotating pin shaft 11 .

[0046] For example, Figures 1-4 As shown, a limit pin 10 is also provided on the fixing plate 2 , and the limit pin 10 presses against the side of the elastic limit member 7 away from the swing rod 6 , and the limit pin 10 is used to keep the elastic limit member 7 in a state of pressing against the swing rod 6 .

[0047] In some embodiments, the elastic stopper 7 may also be other elastic elements such as a compression spring or a tension spring. For example, when the elastic stopper 7 is a compression spring, one end of the compression spring is fixed to the inner wall of the fixed plate 2 or the main housing 1, and the other end of the compression spring is pressed against the side of the swing rod 6 where the pawl portion 601 is not provided, and the compression spring is always in a compressed state, so that the compression spring has a tendency to push the swing rod 6 to press against the ratchet 5; when the elastic stopper 7 is a tension spring, one end of the tension spring is fixed to the inner wall of the fixed plate 2 or the main housing 1, and the other end of the tension spring is connected to the swing rod 6, and the connection point between the tension spring and the inner wall of the fixed plate 2 or the main housing 1 is close to the side of the swing rod 6 where the pawl portion 601 is provided, and the tension spring is always in a stretched state, so that the tension spring has a tendency to pull the swing rod 6 to press against the ratchet 5.

[0048] Exemplarily, the reset drive member 4 is a rotary drive member, the reset transmission member 8 is an eccentric cam, the reset transmission member 8 is mounted on the rotary shaft of the reset drive member 4, the peripheral wall of the reset transmission member 8 abuts against the side of the rocker 6 provided with the pawl portion 601, the reset drive member 4 can drive the eccentric cam to rotate around its rotary shaft, and the rotary axis of the eccentric cam is parallel to the geometric center line but does not coincide. Further, the reset drive member 4 is a rotary motor.

[0049] like Figure 3As shown, when braking for a long time, the elastic limiting member 7 pushes the swing rod 6 to press against the ratchet wheel 5. At this time, the distance between the point where the reset transmission member 8 contacts the swing rod 6 and the rotation axis of the reset transmission member 8 is the smallest; as Figure 4 shown, when it is necessary to release the braking state, the reset driving member 4 drives the reset transmission member 8 to rotate until the distance between the point where the reset transmission member 8 contacts the swing rod 6 and the rotation axis of the reset transmission member 8 reaches the maximum. At this time, the pawl portion 601 has completely disengaged from the ratchet wheel 5.

[0050] In some embodiments, the reset transmission member 8 can also adopt other types of cam structures, such as cylindrical cams, moving cams, etc. When the reset transmission member 8 is a moving cam, the reset driving member 4 can adopt linear driving members such as linear cylinders and electric push rods to drive the moving cam to move linearly to change the posture of the swing rod 6. In another embodiment, the reset transmission member 8 can also adopt a connecting rod structure connected to the swing rod 6, and the reset driving member 4 outputs linear or rotational power to drive the swing rod 6 to rotate.

[0051] Exemplarily, as Figure 5 shown, the electromechanical braking device further includes an upper cover 21, a lower cover 22, a circuit board 23, a terminal block 24, and a transmission gear assembly. The braking motor 3, the reset driving member 4, and the terminal block 24 are all electrically connected to the circuit board 23. The main housing 1 forms an installation space for the braking motor 3 and the reset driving member 4. At the first end of the main housing 1, the main housing 1, the fixing plate 2, and the upper cover 21 enclose to form an installation space for the locking execution assembly and the moving gear assembly. At the second end of the main housing 1, the main housing 1 and the lower cover 22 enclose to form an installation space for the circuit board 23. The terminal block 24 is installed on one side of the lower cover 22 facing the upper cover 21.

[0052] Specifically, as Figure 5 shown, the cooperation of the main housing 1, the fixing plate 2 with the upper cover 21 and the lower cover 22 forms installation spaces at the first end and the second end of the main housing 1 respectively. Among them, the transmission gear assembly and the locking execution assembly are arranged at the first end of the main housing 1, and the circuit board 23 and the terminal block 24 are arranged at the second end of the main housing 1. The circuit board 23, the terminal block 24 and the transmission gear assembly are spaced apart at both ends of the braking motor 3, avoiding the lubricating oil of the transmission gear assembly and the locking execution assembly from flowing to the circuit board 23, and the terminal block 24 will not restrict the structure and internal height of the transmission gear assembly and the locking execution assembly, ensuring the reliability of the internal transmission gear assembly and the locking execution assembly. The terminal block 24 is installed on one side of the lower cover 22 facing the upper cover 21 and is arranged out of alignment with the transmission gear assembly in the horizontal direction, not only reducing the space occupied in the height direction and making the overall structure more compact, but also avoiding the interference of the transmission gear assembly with the assembly of the terminal block 24 and the cable, improving the convenience of assembly.

[0053] Exemplarily, as Figure 1, Figure 2 and Figure 5 As shown, the transmission gear assembly includes a motor gear 12, a primary gear 13, a secondary gear 14 and a planetary gear system, wherein the motor gear 12 is installed on the output shaft of the brake motor 3, the primary gear 13 is meshed with the motor gear 12, the secondary gear 14 is meshed with the primary gear 13, the input end of the planetary gear system is coaxially connected to the secondary gear 14, and the output end of the planetary gear system is connected to the output frame 19, and the output frame 19 passes through the shell to connect the actuator to realize the braking action.

[0054] For example, Figure 1 , Figure 2 and Figure 5 As shown, the planetary gear system includes a sun gear 15, an inner gear ring 16 and a plurality of planetary gears 17, wherein the sun gear 15 is coaxially connected to the secondary gear 14, the inner gear ring 16 is mounted on a housing, an output cavity is provided on the housing, a clamping rib is provided on the inner wall of the output cavity, a clamping groove is provided on the outer wall of the inner gear ring 16, and the clamping rib is engaged with the clamping groove to limit the installation position of the inner gear ring 16; a plurality of planetary gears 17 are meshed with the sun gear 15 and the inner gear ring 16 at the same time, the planetary gears 17 are connected to the output frame 19 through the planetary shaft 18, and the end of the planetary shaft 18 away from the output frame 19 is connected to the planetary gear baffle 20. In this embodiment, four planetary gears 17 are arranged between the sun gear 15 and the inner gear ring 16 for transmission.

[0055] For example, Figure 1 and Figure 2 As shown, the motor gear 12, the first-stage gear 13 and the second-stage gear 14 are all helical gears, which have the advantages of smooth transmission, low noise, high bearing capacity and long service life.

[0056] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A lockable electromechanical brake device, characterized in that: The invention comprises a housing and: A brake motor (3) is provided with a rotatable output shaft; The locking mechanism comprises a reset driving member (4) and a locking actuating assembly, wherein the locking actuating assembly comprises a ratchet (5), a rocker arm (6), an elastic limiting member (7) and a reset transmission member (8), wherein the ratchet (5) is fixed to the output shaft, the reset transmission member (8) is fixed to the output end of the reset driving member (4), one end of the rocker arm (6) is rotatably connected to the housing, the other end of the rocker arm (6) is connected to or abuts against the reset transmission member (8), a ratchet pawl (601) matched with the ratchet (5) is arranged on one side of the rocker arm (6), the elastic limiting member (7) is connected to or abuts against the rocker arm (6), and the elastic limiting member (7) has a tendency to drive the ratchet pawl (601) to press against the ratchet (5), and the reset driving member (4) can drive the rocker arm (6) to rotate through the reset transmission member (8) so that the ratchet pawl (601) is away from the ratchet (5).

2. The electromechanical brake device according to claim 1, characterized in that: The elastic limiting member (7) is a spring sheet, one end of the elastic limiting member (7) is fixed to the housing, and the other end of the elastic limiting member (7) is pressed against the other side of the swing rod (6).

3. The electromechanical brake device according to claim 2, characterized in that: The housing is provided with a fixing pin (9), and one end of the elastic limiting member (7) is fixed to the fixing pin (9); and / or A limit pin (10) is provided on the housing, and the limit pin (10) is pressed against a side of the elastic limit member (7) away from the swing rod (6). The limit pin (10) is used to keep the elastic limit member (7) in a state of pressing against the swing rod (6).

4. The electromechanical brake device according to claim 1, characterized in that: The reset drive member (4) is a rotating drive member, and the reset transmission member (8) is an eccentric cam. The reset transmission member (8) is mounted on the rotating shaft of the reset drive member (4). The peripheral wall of the reset transmission member (8) abuts against a side of the rocker arm (6) provided with the ratchet portion (601). The reset drive member (4) can drive the eccentric cam to rotate around its rotating shaft, and the rotating axis of the eccentric cam is parallel to the geometric center line.

5. The electromechanical brake device according to claim 4, characterized in that: The reset drive member (4) is a rotary motor.

6. The electromechanical brake device according to any one of claims 1 to 5, characterized in that: The casing comprises a main shell (1) and a fixing plate (2), wherein the fixing plate (2) is arranged at a first end of the main shell (1), wherein a first cavity (101) and a second cavity (102) arranged side by side and spaced apart are arranged in the main shell (1), wherein the fixing plate (2) position-limits the brake motor (3) and installs it in the first cavity (101), and position-limits the reset drive component (4) and installs it in the second cavity (102), and the rocker arm (6) and the elastic position-limiting component (7) are both installed on the fixing plate (2).

7. The electromechanical brake device according to any one of claims 1 to 5, characterized in that: The electronic mechanical braking device further comprises an upper cover (21), a lower cover (22), a circuit board (23) and a wiring terminal (24); the braking motor (3), the reset drive component (4) and the wiring terminal (24) are all electrically connected to the circuit board (23); the housing forms an installation space for the braking motor (3) and the reset drive component (4); at a first end of the housing, the housing and the upper cover (21) are combined to form an installation space for the locking actuator; at a second end of the housing, the housing and the lower cover (22) are combined to form an installation space for the circuit board (23); and the wiring terminal (24) is installed on a side of the lower cover (22) facing the upper cover (21).

8. The electromechanical brake device according to any one of claims 1 to 5, characterized in that: The electronic mechanical brake device further comprises a transmission gear assembly, wherein the transmission gear assembly comprises: A motor gear (12) mounted on the output shaft; a primary gear (13) and a secondary gear (14), wherein the primary gear (13) is meshed with the motor gear (12), and the secondary gear (14) is meshed with the primary gear (13); The input end of the planetary gear system is coaxially connected to the secondary gear (14), and the output end of the planetary gear system is connected to the output frame (19).

9. The electromechanical brake device according to claim 8, characterized in that: The planetary gear train comprises: A sun gear (15) is coaxially connected to the secondary gear (14); An inner gear ring (16) mounted on the housing; A plurality of planetary gears (17), wherein the plurality of planetary gears (17) are meshed with the sun gear (15) and the inner gear ring (16) at the same time, and the planetary gears (17) are transmission-connected with the output frame (19) via planetary shafts (18).

10. The electromechanical brake device according to claim 8, characterized in that: The motor gear (12), the first-stage gear (13) and the second-stage gear (14) are all helical gears.

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