An electric driven hand brake

Abstract

The present invention discloses an electric-driven hand brake, which belongs to the field of rail transit brake technology, and includes a hand brake body and a drive device assembly. The hand brake body includes a hand wheel, a brake spindle and a brake device assembly. The drive device assembly includes a motor mechanism and a reduction mechanism, and the drive device assembly is arranged between the hand wheel and the brake device assembly. The electric-driven hand brake adopts an integrated design, and the motor mechanism and the reduction mechanism are rationally arranged between the hand wheel and the brake device assembly. Compared with the external motor solution, the additional installation space requirement is avoided, and the overall volume of the hand brake is greatly reduced. The integrated design allows the output power of the motor mechanism to act directly on the brake spindle through the reduction mechanism, eliminating the commutation device and other connecting components that need to be additionally set up due to the external motor design, thereby simplifying the system structure, while avoiding the energy loss caused by multiple connection links, and realizing efficient and stable torque transmission.

Description

Technical Field

[0001] The invention belongs to the technical field of rail transit braking, in particular to an electrically driven hand brake. Background Art

[0002] The braking system of railway freight cars is an important part of train operation safety. Among them, the handbrake is the core equipment of the train static parking brake and is widely used in railway freight cars. The traditional handbrake is usually composed of brake handwheel, brake chain, brake and other components, and relies on human drive to complete the braking effect. When using a manual handwheel for braking, the operator needs a lot of strength to achieve the required braking torque, which is high in work intensity and safety risks. In addition, the braking torque applied by different operators varies greatly, and a stable braking effect cannot be guaranteed.

[0003] In order to improve the operating efficiency of hand brakes, some hand brakes have introduced motors as auxiliary drive devices. This solution uses motors to provide power, reduce manual operation intensity, and improve braking efficiency. However, most of the current motor-assisted hand brakes adopt an external design, and the motor needs to be connected to the rotating shaft of the brake hand wheel through a reversing device to achieve torque transmission.

[0004] For example, the patent with publication number CN117734763A discloses an intelligent electric hand brake, which adds a motor drive device, a transmission gear device and a force transmission clutch device to the existing hand brake. The operator can directly control the motor operation to realize the braking and relief work of the hand brake. However, in this scheme, the drive motor needs to input torque to the transmission gear device through a reversing device, and a deceleration and torque increase device is also provided between the drive motor and the reversing device, resulting in a large overall size of the motor drive device. The external motor requires additional installation space and fixing devices, resulting in a complex overall structure of the hand brake, which is not conducive to the lightweight design and integrated design of railway freight cars. The operating environment of railway freight cars is complex, and the car body is prone to vibration and impact under high-speed operation and complex track conditions. The external motor is exposed to the external environment and is easily affected by vibration and collision, which reduces its reliability and service life. Summary of the invention

[0005] The object of the present invention is to provide an electrically driven hand brake to solve the above-mentioned problems in the prior art.

[0006] Provided is an electrically driven hand brake, comprising:

[0007] A hand brake body, comprising a hand wheel, a brake spindle and a brake device assembly, wherein the hand wheel is used to transmit torque to one end of the brake spindle, and the other end of the brake spindle is rotatably connected to the brake device assembly;

[0008] A drive device assembly, comprising a motor mechanism, a speed reduction mechanism and a protective shell assembly, wherein the drive device assembly is arranged between the hand wheel and the brake device assembly, the brake spindle movably passes through the motor mechanism, and the output portion of the speed reduction mechanism is used to transmit torque to the brake spindle;

[0009] The motor mechanism includes a motor stator, a motor rotor and a control assembly. The motor stator is arranged on the inner wall of the protective shell assembly. The control assembly is electrically connected to the motor stator and led out from the outer wall of the protective shell assembly. The motor rotor is arranged relative to the inner ring of the motor stator and is fixedly connected to the input part of the reduction mechanism.

[0010] The electric hand brake has two braking modes, namely manual braking and automatic braking. The torque is applied through the handwheel and transmitted to one end of the brake spindle. The brake spindle runs through the drive assembly and transmits the torque to the brake device to achieve the manual braking function. After the motor mechanism in the drive assembly is started, the motor rotor rotates and further adjusts the output torque and speed through the reduction mechanism. The adjusted torque is transmitted through the brake spindle and acts on the brake device to complete the automatic braking process. The combination of manual braking and motor drive mode realizes flexible braking operation.

[0011] The protective shell assembly is fixedly connected to the brake assembly, providing effective protection and support for the drive assembly, isolating the impact of the external environment on the internal motor mechanism and reduction mechanism, and preventing dust, moisture and other pollutants from entering the equipment. The integrated design of the protective shell assembly, motor mechanism and reduction mechanism reduces the exposed area of ​​the equipment, avoids component damage caused by external vibration and impact, and improves the durability and adaptability of the equipment.

[0012] The motor stator is fixed to the inner wall of the protective shell, ensuring the stability of the motor mechanism during operation. The motor stator drives the rotor to rotate through electromagnetic induction, outputting high-speed power to the input part of the reduction mechanism. The control assembly is led out through the outer wall of the protective shell, providing precise control signals and electrical energy to achieve efficient control of the motor mechanism.

[0013] As a further embodiment of the present invention: the reduction mechanism includes a driving gear, an outer gear ring, a plurality of planetary gears, a planetary gear carrier and a plurality of gear shafts, the driving gear is fixedly connected to the output part of the motor mechanism, the outer gear ring is arranged on the inner wall of the protective shell assembly, a plurality of the planetary gears are meshed between the outer gear ring and the driving gear, one end of the gear shaft is fixedly connected to the planetary gear carrier and the other end is rotationally connected to the corresponding planetary gear.

[0014] The driving gear is directly connected to the output part of the motor mechanism, transmitting the high-speed rotation power of the motor rotor to the reduction mechanism. The planetary gear meshes with the outer ring gear and the driving gear, and realizes the power reduction and torque increase transmission through the planetary gear train, and finally outputs the low-speed, high-torque power to the brake spindle.

[0015] As a further embodiment of the present invention: the reduction mechanism further includes a plurality of force transmission shafts, and the plurality of force transmission shafts are fixedly connected to the planetary gear frame. The hand wheel is provided with a plurality of force transmission shaft holes, and the force transmission shafts cooperate with the corresponding force transmission shaft holes.

[0016] The power transmission shaft is designed to directly connect the planetary gear carrier and the handwheel, so that the torque output by the planetary gear carrier can be transmitted to the handwheel through the power transmission shaft, and the handwheel then transmits the torque to the brake spindle. This structure avoids the need to set up additional torque transmission components between the planetary gear carrier and the brake spindle, and improves the compactness and overall integration of the structure.

[0017] During manual operation, the reduction mechanism and motor mechanism will also operate passively, especially the existence of the reduction mechanism will increase the torque requirement when manually operating the handwheel. The force transmission shaft can optimize the force arm of the handwheel driving the planetary gear frame to rotate, reducing the actual resistance during operation, thereby reducing the difficulty of the operator to apply force. This design is particularly important in emergency situations where manual operation is required, ensuring that manual operation of the equipment can still maintain a low force burden when the power is off or the motor fails.

[0018] As a further embodiment of the present invention: the motor mechanism is arranged on a side of the protective shell assembly close to the brake assembly, and the speed reduction mechanism is arranged on a side of the protective shell assembly close to the hand wheel. This design makes the speed reduction mechanism closer to the hand wheel, facilitates the establishment of a structural connection and torque transmission between the hand wheel and the planetary gear carrier, prevents the motor mechanism from interfering with the hand wheel and the speed reduction mechanism, and realizes the compactness of the overall structure.

[0019] As a further embodiment of the present invention: the output part of the motor mechanism is the motor rotor, the input part of the reduction mechanism is the driving gear, the inner ring of the motor rotor is provided with a first flange, one end of the driving gear is provided with a second flange, and the first flange is bolted to the second flange.

[0020] The motor rotor is bolted to the second flange of the driving gear through the first flange to form a firm power transmission interface. Since the second flange has established a structural isolation between the ring gear of the driving gear and the motor rotor, the first flange can be directly set on the inner ring of the motor rotor without the need for an extension structure. When the first flange is connected to the second flange, the motor rotor can be as close to the driving gear as possible without affecting the operation of the components of the reduction mechanism, making the structure between the motor mechanism and the reduction mechanism compact and the space utilization rate high.

[0021] As a further embodiment of the present invention: the side wall of the protective shell assembly extends inward to form a first inner sleeve, and a first sealing sleeve is arranged between the inner ring of the driving gear and the outer ring of the first inner sleeve. The first inner sleeve formed by the extension of the side wall of the protective shell assembly provides axial support for the driving gear to ensure stable operation of the driving gear. The first sealing sleeve is filled between the first inner sleeve and the driving gear to prevent contaminants from entering and maintain an internal lubricating environment.

[0022] As a further embodiment of the present invention: the output part of the speed reduction mechanism is a planetary gear carrier, the side wall of the driving gear extends outward to form a second inner sleeve, and a second sealing sleeve is arranged between the inner ring of the planetary gear carrier and the outer ring of the second inner sleeve. The side wall of the driving gear extends to form the second inner sleeve, which provides axial positioning and support for the planetary gear carrier. The second sealing sleeve is filled between the second inner sleeve and the planetary gear carrier to prevent contaminants from entering and maintain an internal lubricating environment.

[0023] As a further embodiment of the present invention: the output part of the reduction mechanism is a planetary gear carrier, the side wall of the planetary gear carrier extends outward to form a third inner sleeve, and a third sealing sleeve is arranged between the protective shell assembly and the outer ring of the third inner sleeve. The side wall of the planetary gear carrier extends to form the third inner sleeve, which provides guide support for the movement between the protective shell assembly and the planetary gear carrier. The third sealing sleeve is filled between the third inner sleeve and the protective shell assembly to prevent contaminants from intruding and reduce lubricant loss.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. An electrically driven drive assembly is added to the existing hand brake, which can realize automatic braking and release of the hand brake, greatly reducing the workload of operators and improving the safety of operation. At the same time, the traditional manual operation function is retained. There is basically no resistance between the stator and rotor of the motor mechanism, and the gear parts in the reduction mechanism can also move smoothly, so the manual operation function can still be fully realized.

[0026] 2. The electric-driven hand brake adopts an integrated design, and the motor mechanism and the reduction mechanism are rationally arranged between the hand wheel and the brake assembly, and arranged on the same central axis as the brake main shaft of the hand brake. Compared with the external motor solution, it avoids the need for additional installation space and greatly reduces the overall volume of the hand brake. The integrated design reduces the exposed area of ​​the components, avoids the problem of external motors being easily damaged by external vibration and collision, and significantly enhances the adaptability and service life of the equipment in the complex operating environment of railway freight cars.

[0027] 3. The integrated design allows the output power of the motor mechanism to act directly on the brake spindle through the reduction mechanism, eliminating the need for additional commutation devices and other connecting components required for the external motor design, thereby simplifying the system structure and avoiding energy losses caused by multiple connection links, achieving efficient and stable torque transmission, and further improving the efficiency and reliability of the braking system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0029] Figure 1 It is a schematic diagram of the cross-sectional structure of the electric-driven hand brake;

[0030] Figure 2 It is the structural explosion diagram of the electric-driven hand brake;

[0031] Figure 3 A is an exploded view of a portion of the structure of the electric-driven hand brake;

[0032] Figure 4 B is a partial structural exploded diagram of the electric-driven hand brake;

[0033] Figure 5 A schematic diagram of the assembly of the drive device provided by the present invention;

[0034] Figure 6 It is a schematic diagram of the overall structure of the electric-driven hand brake.

[0035] In the figure: 1, hand brake body; 11, hand wheel; 111, force transmission shaft hole; 12, brake main shaft; 13, brake device assembly; 2, drive device assembly; 21, motor mechanism; 211, motor stator; 212, motor rotor; 213, control assembly; 214, first flange; 22, speed reduction mechanism; 221, driving gear; 222, outer gear ring; 223, planetary gear; 224, planetary gear carrier; 225, gear shaft; 226, force transmission shaft; 227, second flange; 23, protective shell assembly; 231, rear cover; 232, outer shell; 233, front cover; 31, first inner sleeve; 32, second inner sleeve; 33, third inner sleeve; 41, first sealing sleeve; 42, second sealing sleeve; 43, third sealing sleeve. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0037] Obviously, the drawings described below are only some examples or embodiments of the present invention. For ordinary technicians in this field, the present invention can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed by the present invention, some changes in design, manufacturing or production based on the technical content disclosed by the present invention are just conventional technical means, and should not be understood as insufficient content disclosed by the present invention.

[0038] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present invention and are not intended to limit the subject matter described in the claims.

[0039] See also Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the electric-driven hand brake in the embodiment of the present invention comprises a hand brake body 1 and a drive assembly 2. The hand brake body 1 comprises a hand wheel 11, a brake spindle 12 and a brake assembly 13. The hand wheel 11 is used to transmit torque to one end of the brake spindle 12, and the other end of the brake spindle 12 is rotatably connected to the brake assembly 13. The drive assembly 2 comprises a motor mechanism 21 and a reduction mechanism 22. The drive assembly 2 is arranged between the hand wheel 11 and the brake assembly 13. The brake spindle 12 movably passes through the motor mechanism 21. The output part of the motor mechanism 21 is fixedly connected to the input part of the reduction mechanism 22. The output part of the reduction mechanism 22 is used to transmit torque to the brake spindle 12.

[0040] It should be noted that the input part of the speed reduction mechanism 22 is an end that receives a high-speed, low-torque power source, and the output part of the speed reduction mechanism 22 is an end that outputs the low-speed, high-torque power after deceleration. In one embodiment, the output part of the motor mechanism 21 is the motor rotor 212, the input part of the speed reduction mechanism 22 is the driving gear 221, and the output part of the speed reduction mechanism 22 is the planetary gear carrier 224.

[0041] The hand brake rotates the hand wheel 11 forward by human power, driving the brake spindle 12 of the hand brake to rotate and drive the chain gear to rotate, so that the brake chain is subjected to force to tighten the brake device, thereby realizing the braking function of the hand brake. When the hand wheel 11 is operated in the reverse direction by human power, the corresponding brake chain is loosened and the force is no longer tightened on the brake device, thereby achieving the relief state of the hand brake. The chain gear brake device part is a prior art, and the specific structure is not repeated here.

[0042] See also Figure 1-Figure 4 As shown, the electric-driven hand brake of the present invention is designed with a drive device assembly 2 on the hand brake body 1 to realize electric drive. The motor mechanism 21 and the reduction mechanism 22 are installed in the protective shell assembly 23. The protective shell assembly 23 includes a rear cover 231, an outer shell 232 and a front cover plate 233. The outer shell 232 is located between the rear cover 231 and the front cover plate 233 to form a cover structure. A brake device assembly 13 is designed on the hand brake body 1. The rear cover 231 of the protective shell assembly 23 is fixed to the brake device assembly 13 by fasteners, so that the drive device assembly 2 is installed and fixed on the hand brake body 1 with the brake spindle 12 of the hand brake body 1 as the center.

[0043] The electric-driven hand brake includes two sets of braking modes: manual mode and automatic mode. The hand brake applies torque by rotating the hand wheel, and the torque is transmitted to the brake spindle 12 to complete the manual braking function. After the drive device assembly 2 is started, the motor mechanism 21 generates rotational power, adjusts the torque and speed through the reduction mechanism 22, and then applies the adjusted power to the brake system through the brake spindle 12 to achieve the automatic braking function.

[0044] When the reduction mechanism 22 outputs torque, the torque can be directly output to the brake spindle 12 through the torque transmission structure, but this requires an additional connection structure to be added to the brake spindle 12 section, and the overall length of the brake spindle 12 needs to be increased, which is not conducive to the integration of the brake machine. In addition, during manual operation, since the reduction mechanism 22 and the motor mechanism 21 will also operate passively, the torque demand for directly driving the reduction mechanism 22 and the motor mechanism 21 to operate through the brake spindle 11 will increase. Therefore, in the present invention, the motor mechanism 21 is arranged on the side of the protective shell assembly 23 close to the brake device assembly 13, and the reduction mechanism 22 is arranged on the side of the protective shell assembly 23 close to the handwheel 11. A force transmission shaft 226 is arranged between the handwheel 11 and the planetary gear carrier 224, and the force transmission shaft 226 is fixed to the planetary gear carrier 224 by fasteners. The handwheel 11 is designed with a force transmission shaft hole 111 corresponding to the force transmission shaft 226.

[0045] The force transmission shaft 226 connects the planetary gear carrier 224 and the handwheel 11, and directly transmits the output torque of the planetary gear carrier 224 to the handwheel 11, and the handwheel 11 then transmits the torque to the brake spindle 12. The force transmission shaft 226 reduces the operating resistance of the handwheel 11 by optimizing the lever arm design, ensuring high operating flexibility in manual mode, and reduces the additional torque transmission components between the planetary gear carrier 224 and the brake spindle 12, thereby improving the compactness of the system. After the speed reduction mechanism 22 is close to one end of the handwheel 11, the motor mechanism 21 will not interfere with the force transmission shaft 226, reducing the structural complexity and making the entire device more compact and simple.

[0046] In addition to the motor rotor 212, the motor mechanism 21 also includes a motor stator 211 and a control assembly 213. The motor stator 211 is fixed to the inner wall of the outer shell 232 of the protective shell assembly 23, the control assembly 213 is electrically connected to the motor stator 211 and is led out from the outer wall of the outer shell 232, and the motor rotor 212 is arranged relative to the inner ring of the motor stator 211 and is fixedly connected to the driving gear 221 of the reduction mechanism 22. The motor rotor 212 obtains power through electromagnetic induction and transmits it to the driving gear 221. The control assembly 213 is led out from the outer wall of the outer shell 232 to provide accurate control signals and power support for the motor mechanism 21.

[0047] Different from the external motor drive mode, the present invention integrates the motor mechanism 21 on the brake spindle 12, and can ensure the driving force by increasing the number of windings of the motor stator 211 and the motor rotor 212 in the circumferential direction, so that the motor mechanism 21 exchanges the radial width for the axial length, shortening the overall length required for the integrated brake spindle 12. The output direction of the motor rotor 212 is the same as the axial direction of the brake spindle 12, so no additional commutation device is required.

[0048] In addition to the driving gear 221 and the planetary gear carrier 224, the speed reduction mechanism 22 also includes an outer gear ring 222, a plurality of planetary gears 223 and a plurality of gear shafts 225. The driving gear 221 is fixedly connected to the motor rotor 212, the outer gear ring 222 is fixed to the inner wall of the outer shell 232 of the protective shell assembly 23, a plurality of planetary gears 223 are meshed between the outer gear ring 222 and the driving gear 221, and one end of the gear shaft 225 is fixedly connected to the planetary gear carrier 224 and the other end is rotationally connected to the corresponding planetary gear 223.

[0049] When the motor is powered on for operation, the motor stator 211 drives the motor rotor 212 to rotate around the brake main shaft 12. The motor rotor 212 and the driving gear 221 are fixed together with fasteners. When the motor rotor 212 rotates, it drives the driving gear 221 to rotate around the brake main shaft 12. At the same time, the driving gear 221 rotates to drive the mutually meshing planetary gears 223 to rotate on the outer gear ring 222. The planetary gears 223 are fixed to the planetary gear carrier 224 through the gear shaft 225. When the planetary gears 223 revolve on the outer gear ring 222, they rotate around the gear shaft 225 and drive the planetary gear carrier 224 that fixes the planetary gears 223 to rotate slowly around the brake main shaft 12, thereby realizing the function of the speed reduction mechanism 22 to reduce speed and increase torque. The planetary reducer reduces speed through a plurality of planetary gears, and can also achieve a flat design, thereby minimizing the overall length required for the brake main shaft 12.

[0050] Furthermore, the inner ring of the motor stator 211 is provided with a first flange 214, and one end of the driving gear 221 is provided with a second flange 227, and the first flange 214 is bolted to the second flange 227. This connection method makes the power transmission between the motor rotor 212 and the driving gear 221 more secure and efficient. The second flange 227 establishes a structural isolation between the gear ring of the driving gear 221 and the motor rotor 212. The flange connection method can provide a certain degree of isolation while ensuring the stability of the mechanical connection, avoiding mechanical wear caused by structural errors. The first flange 214 can be directly arranged on the inner ring of the motor rotor 212 without the need for an extension structure. When the first flange 214 is connected to the second flange 227, the motor rotor 212 can be as close to the driving gear 221 as possible without affecting the operation of the components of the reduction mechanism 22, so that the structure between the motor mechanism 21 and the reduction mechanism 22 is compact and the space utilization rate is high.

[0051] In order to ensure the waterproof and dustproof sealing protection effects of the drive device assembly 2, the rear cover 231 of the protective shell assembly 23 passes through the side wall portion of the brake spindle 12 and extends inward to form a first inner sleeve 31. A first sealing sleeve 41 is provided between the inner ring of the driving gear 221 and the outer ring of the first inner sleeve 31. The first inner sleeve 31 provides axial support for the driving gear 221 to ensure stable operation of the driving gear 221. The first sealing sleeve 41 is filled between the first inner sleeve 31 and the driving gear 221 to prevent contaminants from entering and maintain an internal lubricating environment.

[0052] Similarly, the side wall of the driving gear 221 extends outward to form a second inner sleeve 32, and a second sealing sleeve 42 is provided between the inner ring of the planetary gear carrier 224 and the outer ring of the second inner sleeve 32. The second inner sleeve 32 provides axial positioning and support for the planetary gear carrier 224. The second sealing sleeve 42 is filled between the second inner sleeve 32 and the planetary gear carrier 224 to prevent contaminants from entering and maintain an internal lubricating environment.

[0053] The planetary gear carrier 224 extends outward through the side wall portion of the brake spindle 12 to form a third inner sleeve 33, and a third sealing sleeve 43 is provided between the front cover plate 233 of the protective housing assembly 23 and the outer ring of the third inner sleeve 33. The third inner sleeve 33 provides guide support for the movement between the protective housing assembly 23 and the planetary gear carrier 224. The third sealing sleeve 43 is filled between the third inner sleeve 33 and the protective housing assembly 23 to prevent the intrusion of pollutants and reduce the loss of lubricant.

[0054] The multiple sealing design improves the reliability and durability of the system, ensuring the long-term stable operation of the equipment under complex working conditions.

[0055] It should be noted that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present invention are all included in the technical scope of the present invention. In addition, without departing from the scope of the main purpose of the present invention, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present invention.

Claims

1. An electrically driven hand brake, characterized in that: include: A hand brake body (1) comprising a hand wheel (11), a brake spindle (12) and a brake device assembly (13), wherein the hand wheel (11) is used to transmit torque to one end of the brake spindle (12), and the other end of the brake spindle (12) is rotationally connected to the brake device assembly (13); A drive device assembly (2), comprising a motor mechanism (21), a speed reduction mechanism (22) and a protective shell assembly (23), wherein the drive device assembly (2) is arranged between the hand wheel (11) and the brake device assembly (13), the brake spindle (12) movably passes through the motor mechanism (21), and the output portion of the speed reduction mechanism (22) is used to transmit torque to the brake spindle (12); The motor mechanism (21) comprises a motor stator (211), a motor rotor (212) and a control assembly (213); the motor stator (211) is arranged on the inner wall of the protective shell assembly (23); the control assembly (213) is electrically connected to the motor stator (211) and is led out from the outer wall of the protective shell assembly (23); the motor rotor (212) is arranged opposite to the inner ring of the motor stator (211) and is fixedly connected to the input part of the speed reduction mechanism (22); The speed reduction mechanism (22) comprises a driving gear (221), an outer gear ring (222), a plurality of planetary gears (223), a planetary gear carrier (224), and a plurality of gear shafts (225); the driving gear (221) is fixedly connected to the output portion of the motor mechanism (21); one end of the gear shaft (225) is fixedly connected to the planetary gear carrier (224) and the other end is rotationally connected to the corresponding planetary gear (223); The motor mechanism (21) is arranged on a side of the protective shell assembly (23) close to the brake device assembly (13), and the speed reduction mechanism (22) is arranged on a side of the protective shell assembly (23) close to the hand wheel (11).

2. An electrically driven hand brake according to claim 1, characterized in that: The outer gear ring (222) is arranged on the inner wall of the protective shell assembly (23), and a plurality of the planetary gears (223) are meshed between the outer gear ring (222) and the driving gear (221).

3. An electrically driven hand brake according to claim 2, characterized in that: The speed reduction mechanism (22) further comprises a plurality of force transmission shafts (226), wherein the plurality of force transmission shafts (226) are fixedly connected to the planetary gear frame (224), and the hand wheel (11) is provided with a plurality of force transmission shaft holes (111), wherein the force transmission shafts (226) cooperate with corresponding force transmission shaft holes (111).

4. The electrically driven hand brake according to claim 1, characterized in that: The output part of the motor mechanism (21) is a motor rotor (212), the input part of the speed reduction mechanism (22) is a driving gear (221), the inner ring of the motor rotor (212) is provided with a first flange (214), one end of the driving gear (221) is provided with a second flange (227), and the first flange (214) and the second flange (227) are connected by bolts.

5. An electrically driven hand brake according to claim 4, characterized in that: The side wall of the protective shell assembly (23) extends inwardly to form a first inner shaft sleeve (31), and a first sealing shaft sleeve (41) is provided between the inner ring of the driving gear (221) and the outer ring of the first inner shaft sleeve (31).

6. The electrically driven hand brake according to claim 4, characterized in that: The output portion of the speed reduction mechanism (22) is a planetary gear carrier (224), the side wall of the driving gear (221) extends outward to form a second inner shaft sleeve (32), and a second sealing shaft sleeve (42) is provided between the inner ring of the planetary gear carrier (224) and the outer ring of the second inner shaft sleeve (32).

7. The electrically driven hand brake according to claim 4, characterized in that: The output portion of the speed reduction mechanism (22) is a planetary gear carrier (224), the side wall of the planetary gear carrier (224) extends outward to form a third inner shaft sleeve (33), and a third sealing shaft sleeve (43) is provided between the protective shell assembly (23) and the outer ring of the third inner shaft sleeve (33).

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