Roller motor assembly

Abstract

The invention belongs to the technical field of logistics conveying, and particularly relates to a roller motor assembly. The motor reducer assembly comprises a power output unit, an expansion mechanism is arranged on the peripheral face of the power output unit, the power output unit is in interference fit with a first area of the inner wall of the barrel shell through the expansion mechanism, and the first area is the area, close to the center of the barrel shell, in the axial direction of the barrel shell. The three radial supporting point positions are arranged on the inner side of the barrel shell, that is, the two ends of the barrel shell are supported by the two end covers, the middle of the barrel shell is supported by the power output unit, compared with a traditional scheme, the axial span between every two adjacent supporting point positions is reduced, and under the condition that an additional reinforcing structure is not added, the supporting point positions are reduced; the overall strength of the barrel shell is improved; the power output unit is arranged in the middle of the barrel shell, torsional stress generated by driving loads is evenly transmitted to the two ends from the center of the barrel shell, the risk of deformation of the barrel shell is reduced, and the reliability of power transmission is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of logistics transportation, and in particular relates to a roller motor assembly. Background Art

[0002] The electric roller is one of the important parts of the conveyor line. Its function is to drive the flow of goods, and sometimes it is also used to drive other unpowered rollers to rotate. The electric roller generally includes a cylinder, and a driving element is arranged inside the cylinder. The driving element is fixedly connected to the frame outside the roller through a fixed shaft, and the power output end of the driving element is connected to the cylinder to drive the cylinder to rotate relative to the fixed shaft. The cylinder in the prior art is generally made of thin-walled steel pipe. In order to ensure the smoothness and integrity of the cylinder surface, bolts and other fasteners are generally not provided between the power output end of the driving element and the cylinder. The common practice is to connect the power output end to the end cover at one end of the cylinder, and then use the connection between the end cover and the cylinder to realize the power transmission between the power output end and the cylinder. This method can meet the use requirements when facing a shorter drum, but when the drum is longer, there will be the following defects: first, the driving load at the power output end only acts on one end of the drum. When the cargo on the drum is heavier or the cargo is biased toward the other end of the drum, a large torsional stress will be generated between the two ends of the drum. Since the axial span of the drum is large, this torsional stress can easily cause deformation of the drum. Second, when the drum is long, the middle part of the drum lacks effective radial support, and the drum itself is easily deformed under the weight of the cargo. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a drum motor assembly that can effectively improve the structural strength of the drum and the reliability of power transmission.

[0004] To achieve the above objectives and other related objectives, the present invention provides a drum motor assembly, comprising: Shell; A motor reducer assembly, the motor reducer assembly is accommodated in the cylindrical shell, the motor reducer assembly includes a power output unit, an expansion mechanism is provided on the outer circumferential surface of the power output unit, the power output unit is interference-connected with a first area of ​​the inner wall of the cylindrical shell through the expansion mechanism, and the first area is an area close to the center of the cylindrical shell in the axial direction of the cylindrical shell; A first fixed shaft and a second fixed shaft, wherein the first fixed shaft and the second fixed shaft are respectively circumferentially fixedly connected to two ends of the motor reducer assembly, and the first fixed shaft and the second fixed shaft are respectively pressed against the motor reducer assembly from two ends of the motor reducer assembly; A first end cover is rotatably connected to the first fixed shaft, and the first end cover is pressed against the first fixed shaft from one end of the first fixed shaft away from the motor reducer assembly, and the first end cover is interference-connected with the inner wall of the first end of the cylinder shell; The second end cover is rotatably connected to the second fixed shaft, and the second end cover is pressed against the second fixed shaft from one end of the second fixed shaft away from the motor reducer assembly, and the second end cover is interference-connected with the inner wall of the second end of the cylinder shell.

[0005] In an optional embodiment of the present invention, a disc-shaped flange is provided on the outer circumferential surface of the power output unit, and the expansion mechanism includes an annular elastic member and an annular rigid member stacked in sequence along the axial direction of the power output unit from one end surface of the disc-shaped flange, and at least two of the annular elastic members and the annular rigid members are provided respectively, and the annular elastic members and the annular rigid members are alternately arranged along the axial direction of the power output unit, and the end closest to the disc-shaped flange is the annular elastic member, and the end farthest from the disc-shaped flange is the annular rigid member; a locking mechanism is provided between the annular rigid member farthest from the disc-shaped flange and the power output unit, and the locking mechanism is configured to be able to keep the annular rigid member in a state of pressing the annular elastic member and causing the annular elastic member to deform, and when the annular elastic member is deformed, the outer circumferential surface of the annular elastic member protrudes from the outer circumferential surface of the disc-shaped flange.

[0006] In an optional embodiment of the present invention, the inner circumferential surface of the annular rigid member forms a clearance fit with the outer circumferential surface of the power output unit, an annular groove is provided on the outer circumferential surface of the power output unit, the locking mechanism includes a retaining spring, the retaining spring is clamped in the annular groove, and the retaining spring protrudes from the outer circumferential surface of the power output unit, and the annular rigid member farthest from the disc-shaped flange abuts against the retaining spring.

[0007] In an optional embodiment of the present invention, the first end cover is provided with a first through hole for the first fixed shaft to pass through, and a first sinker is provided at one end of the first through hole facing the motor reducer assembly, and a first bearing is provided between the first end cover and the first fixed shaft, and the outer ring of the first bearing abuts against the first sinker, and the inner ring of the first bearing abuts against the first step provided on the first fixed shaft.

[0008] In an optional embodiment of the present invention, a first sliding sealing ring is provided between the inner wall of the first through hole and the first fixed shaft, a second sinker is provided at one end of the first through hole away from the motor reducer assembly, and a first sealing end cover is provided in the second sinker.

[0009] In an optional embodiment of the present invention, the second end cover is provided with a second through hole for the second fixed shaft to pass through, and a third sinker is provided at one end of the second through hole facing the motor reducer assembly, and a second bearing is provided between the second end cover and the second fixed shaft, and the outer ring of the second bearing abuts against the third sinker, and the inner ring of the second bearing abuts against the second step provided on the second fixed shaft.

[0010] In an optional embodiment of the present invention, a second sliding sealing ring is provided between the inner wall of the second through hole and the second fixed shaft, a fourth sinker is provided at one end of the second through hole away from the motor reducer assembly, and a second sealing end cover is provided in the fourth sinker.

[0011] In an optional embodiment of the present invention, the motor reducer assembly includes a motor and a reducer, the reducer includes a housing, a first gear, a second gear, a third gear and a fourth gear, the first gear, the second gear, the third gear and the fourth gear are rotatably connected to the housing, an output gear is provided on the main shaft of the motor, the power output unit includes an output ring gear, the first gear is coaxially fixed with the second gear, the third gear is coaxially fixed with the fourth gear, the first gear is meshed with the output gear, the second gear is meshed with the third gear, and the fourth gear is meshed with the output ring gear.

[0012] In an optional embodiment of the present invention, a first socket is provided at an end of the housing away from the motor, a second socket is provided at an end of the motor away from the reducer, the first fixed shaft passes through the output ring gear and is inserted into the first socket, a first key body is provided between the first fixed shaft and the first socket, the second fixed shaft is inserted into the second socket, a second key body is provided between the second fixed shaft and the second socket, a third step is provided on the first fixed shaft for abutting against the end face of the housing, and a fourth step is provided on the second fixed shaft for abutting against the end face of the motor.

[0013] In an optional embodiment of the present invention, a wiring harness channel is provided inside the second fixed shaft, one end of the wiring harness channel is located on an end surface of the second fixed shaft away from the motor reducer assembly, and the other end of the wiring harness channel is located on the circumferential surface of the second fixed shaft on the inner side of the second end cover, and the cables of the motor reducer assembly are guided to the outside of the cylinder shell through the wiring harness channel.

[0014] The technical effect of the present invention is that: the present invention sets three radial support points on the inner side of the cylinder shell, that is, two end covers support the two ends of the cylinder shell, and the power output unit supports the middle part of the cylinder shell. Compared with the traditional scheme, the present invention reduces the axial span between two adjacent support points, and improves the overall strength of the cylinder shell without adding additional reinforcement structure; the present invention sets the power output unit in the middle of the cylinder shell, and the torsional stress generated by the driving load is evenly transmitted from the center of the cylinder shell to both ends, which reduces the risk of deformation of the cylinder shell and improves the reliability of power transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a front view of a drum motor assembly provided by an embodiment of the present invention; Figure 2 yes Figure 1 AA section view; Figure 3 yes Figure 2 I partial enlarged view; Figure 4 yes Figure 2 II partial enlarged view; Figure 5 yes Figure 2 Partial enlarged view of III; Figure 6 is a three-dimensional diagram of a power output unit provided by an embodiment of the present invention; Figure 7 is an exploded view of a power output unit provided by an embodiment of the present invention; Figure 8 is an exploded view of a motor reducer assembly and a power output unit provided by an embodiment of the present invention; Fig. 9 is an assembly diagram of a motor reducer assembly and a power output unit provided by an embodiment of the present invention; Fig.10 is an exploded view of a first end cover and a first fixed shaft provided by an embodiment of the present invention; Fig.11 is an exploded view of the second end cover and the second fixed shaft provided by an embodiment of the present invention; Explanation of the reference numerals: 10, cylinder shell; 11, first end cover; 111, first sliding sealing ring; 112, first sealing end cover; 12, second end cover; 121, second sliding sealing ring; 122, second sealing end cover; 13, first fixed shaft; 131, first step; 132, third step; 14, second fixed shaft; 141, harness channel; 142, second step; 143, fourth step; 15, first bearing; 16, second bearing; 17, first key body; 18, second key body; 20, motor reducer assembly; 21, motor; 22, housing; 23, output gear; 24, first gear; 25, second gear; 26, third gear; 27, fourth gear; 28, power output unit; 281, disc flange; 282, annular groove; 30, expansion mechanism; 31, annular elastic member; 32, annular rigid member; 33, retaining spring. DETAILED DESCRIPTION

[0016] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0017] It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention in a schematic manner, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0018] See also Figure 1-Figure 11As shown, the drum motor assembly provided by the embodiment of the present invention includes a drum shell 10, a motor reducer assembly 20, a first fixed shaft 13, a second fixed shaft 14, a first end cover 11 and a second end cover 12. In a specific embodiment, the drum shell 10 can be made of a thin-walled steel pipe, and the outside of the drum shell 10 can also be coated with rubber to make the drum surface have a large friction force; the motor reducer assembly 20 is accommodated in the drum shell 10, and the motor reducer assembly 20 includes a power output unit 28, and an expansion mechanism 30 is provided on the outer circumference of the power output unit 28. The power output unit 28 is interference-connected with a first area of ​​the inner wall of the drum shell 10 through the expansion mechanism 30. The first area is an area close to the center of the drum shell 10 in the axial direction of the drum shell 10; the first fixed shaft 13 and the second fixed shaft 14 are respectively connected to the motor reducer 28 and the first fixed shaft 14 is connected to the drum shell 10. The two ends of the reducer assembly 20 are circumferentially fixedly connected, and the first fixed shaft 13 and the second fixed shaft 14 are respectively pressed against the motor reducer assembly 20 from both ends of the motor reducer assembly 20; it should be understood that during the operation of the drum, the first fixed shaft 13, the second fixed shaft 14 and the motor reducer assembly 20 are fixedly connected to the frame outside the drum, that is, the first fixed shaft 13, the second fixed shaft 14 and the motor reducer assembly 20 themselves do not rotate, and the first fixed shaft 13, the second fixed shaft 14 and the motor reducer assembly 20 are equivalent to jointly constituting a support shaft for supporting the drum shell 10.

[0019] The first end cover 11 is rotatably connected to the first fixed shaft 13, and the first end cover 11 is pressed against the first fixed shaft 13 from one end of the first fixed shaft 13 away from the motor reducer assembly 20, and the first end cover 11 is interference connected to the inner wall of the first end of the cylindrical shell 10; the second end cover 12 is rotatably connected to the second fixed shaft 14, and the second end cover 12 is pressed against the second fixed shaft 14 from one end of the second fixed shaft 14 away from the motor reducer assembly 20, and the second end cover 12 is interference connected to the inner wall of the second end of the cylindrical shell 10. The present invention sets three radial support points on the inner side of the cylindrical shell 10, that is, two end covers support the two ends of the cylindrical shell 10, and the power output unit 28 supports the middle of the cylindrical shell 10. Compared with the traditional solution, the present invention reduces the axial span between two adjacent support points, and improves the overall strength of the cylindrical shell 10 without adding additional reinforcement structures; the present invention sets the power output unit 28 in the middle of the cylindrical shell 10, and the torsional stress generated by the driving load is evenly transmitted from the center of the cylindrical shell 10 to the two ends, reducing the risk of deformation of the cylindrical shell 10 and improving the reliability of power transmission. In addition, the present invention uses the interference connection between the expansion mechanism 30 and the inner wall of the cylindrical shell 10 to realize the power transmission between the power output unit 28 and the cylindrical shell 10, avoiding the provision of fasteners on the cylindrical shell 10, and ensuring the appearance quality of the cylindrical shell 10.

[0020] See also Figure 3 , Figure 6 , Figure 7As shown, in an optional embodiment of the present invention, a disc-shaped flange 281 is provided on the outer circumferential surface of the power output unit 28, and the expansion mechanism 30 includes an annular elastic member 31 and an annular rigid member 32 stacked in sequence along the axial direction of the power output unit 28 from one end surface of the disc-shaped flange 281, and at least two annular elastic members 31 and annular rigid members 32 are provided respectively, and the annular elastic members 31 and annular rigid members 32 are alternately arranged along the axial direction of the power output unit 28, and the end closest to the disc-shaped flange 281 is the annular elastic member 31, and the end farthest from the disc-shaped flange 281 is the annular rigid member 32; a locking mechanism is provided between the annular rigid member 32 farthest from the disc-shaped flange 281 and the power output unit 28, and the locking mechanism is configured to be able to keep the annular rigid member 32 in a state of pressing the annular elastic member 31 and causing the annular elastic member 31 to deform, and when the annular elastic member 31 is deformed, the outer circumferential surface of the annular elastic member 31 protrudes from the outer circumferential surface of the disc-shaped flange 281. The present invention utilizes the expansion of the annular elastic member 31 to realize the fixed connection between the power output unit and the inner wall of the cylindrical shell 10. Since the annular elastic member 31 is continuously distributed along the outer circumference of the power output unit 28, when the annular elastic member 31 expands, its outer circumference can be in uniform contact with the inner wall of the cylindrical shell 10, thereby ensuring the coaxiality between the power output unit 28 and the inner wall of the cylindrical shell 10, and further improving the reliability of power transmission. It should be noted that since the power output unit 28 is installed at a deeper position in the cylindrical shell 10, the power output unit 28 cannot directly use the outer circumference to form an interference fit with the inner wall of the cylindrical shell 10. In a specific embodiment, for example, the outer circumference of the power output unit 28 can be made to form a clearance fit with the inner wall of the cylindrical shell 10 to ensure that the power output unit 28 can slide smoothly to the specified position, and then use a long rod tool to press the two ends of the power output unit 28 to expand the annular elastic member 31, and then use a locking mechanism to keep the annular elastic member 31 in the expanded state, so as to achieve the fixed connection between the power output unit 28 and the cylindrical shell 10.

[0021] See also Figure 3 , Figure 6 , Figure 7As shown, in an optional embodiment of the present invention, the inner circumference of the annular rigid member 32 forms a clearance fit with the outer circumference of the power output unit 28, an annular groove 282 is provided on the outer circumference of the power output unit 28, and the locking mechanism includes a retaining spring 33, which is clamped in the annular groove 282, and the retaining spring 33 protrudes from the outer circumference of the power output unit 28, and the annular rigid member 32 farthest from the disc flange 281 abuts against the retaining spring 33. The retaining spring 33 can easily lock the position of the annular rigid member 32. The specific operation process is as follows: before the power output unit 28 is installed into the cylindrical shell 10, the retaining spring 33 can be put on the outer peripheral surface of the power output unit 28, and it is spaced a certain distance from the annular groove 282 to ensure that the annular elastic member 31 is in an un-extruded state. When the power output unit 28 is installed into the designated position of the cylindrical shell 10, the disc-shaped flange 281 and the annular rigid member 32 are squeezed by a long rod tool to make the outer peripheral surface of the annular elastic member 31 expand outward, and at the same time, the retaining spring 33 is squeezed and pushed in the direction close to the annular groove 282 until the retaining spring 33 is inserted into the annular groove 282 to achieve the locking of the position of the annular rigid member 32.

[0022] See also Figure 2 , Figure 4 , Figure 5 , Fig.10 , Fig.11 As shown, in an optional embodiment of the present invention, the first end cover 11 is provided with a first through hole for the first fixed shaft 13 to pass through, and a first sinker is provided at one end of the first through hole facing the motor reducer assembly 20, and a first bearing 15 is provided between the first end cover 11 and the first fixed shaft 13, and the outer ring of the first bearing 15 abuts against the first sinker, and the inner ring of the first bearing 15 abuts against the first step 131 provided on the first fixed shaft 13; a first sliding sealing ring 111 is provided between the inner wall of the first through hole and the first fixed shaft 13, and a second sinker is provided at one end of the first through hole away from the motor reducer assembly 20, and a first Sealing end cover 112; the second end cover 12 is provided with a second through hole for the second fixed shaft 14 to pass through, a third sink is provided at one end of the second through hole facing the motor reducer assembly 20, a second bearing 16 is provided between the second end cover 12 and the second fixed shaft 14, the outer ring of the second bearing 16 abuts against the third sink, and the inner ring of the second bearing 16 abuts against the second step 142 provided on the second fixed shaft 14; a second sliding sealing ring 121 is provided between the inner wall of the second through hole and the second fixed shaft 14, a fourth sink is provided at one end of the second through hole away from the motor reducer assembly 20, and a second sealing end cover 122 is provided in the fourth sink. The present invention utilizes the mutual abutment between the end cover, the fixed shaft, and the motor reducer, and finally realizes the fixing of the axial position of each component through the interference connection force between the end cover and the cylindrical shell 10, simplifies the assembly process, and improves the assembly efficiency.

[0023] See also Figure 8 , Fig. 9As shown, in an optional embodiment of the present invention, the motor reducer assembly 20 includes a motor 21 and a reducer, the reducer includes a housing 22, a first gear 24, a second gear 25, a third gear 26 and a fourth gear 27, the first gear 24, the second gear 25, the third gear 26 and the fourth gear 27 are rotatably connected to the housing 22, an output gear 23 is provided on the main shaft of the motor 21, the power output unit 28 includes an output ring gear, the first gear 24 is coaxially fixed with the second gear 25, the third gear 26 is coaxially fixed with the fourth gear 27, the first gear 24 is meshed with the output gear 23, the second gear 25 is meshed with the third gear 26, and the fourth gear 27 is meshed with the output ring gear. The present invention can realize a three-stage reduction function, namely, a reduction transmission between the output gear 23 and the first gear 24, a reduction transmission between the second gear 25 and the third gear 26, and a reduction transmission between the fourth gear 27 and the output ring gear, so that the power output unit 28 can obtain a larger output torque. Under the premise of ensuring the power output performance of the drum, the power and size parameters of the motor 21 can be reduced, the miniaturized design of the drum can be realized, and the manufacturing cost can be reduced.

[0024] See also Figure 2 , Fig.10 , Fig.11 As shown, in an optional embodiment of the present invention, a first plug hole is provided at one end of the housing 22 away from the motor 21, a second plug hole is provided at one end of the motor 21 away from the reducer, the first fixed shaft 13 passes through the output gear ring and is inserted into the first plug hole, and a first key body 17 is provided between the first fixed shaft 13 and the first plug hole, the second fixed shaft 14 is inserted into the second plug hole, and a second key body 18 is provided between the second fixed shaft 14 and the second plug hole, the first fixed shaft 13 is provided with a third step 132 abutting against the end face of the housing 22, and the second fixed shaft 14 is provided with a fourth step 143 abutting against the end face of the motor 21. The two fixed shafts in the present invention are connected through the motor 21 and the housing 22 of the reducer, and the motor 21 and the housing 22 of the reducer act as part of the entire fixed shaft, which saves the internal space of the drum while ensuring the structural strength.

[0025] See also Figure 5 , Fig.11 As shown, in an optional embodiment of the present invention, a wiring harness channel 141 is provided inside the second fixed shaft 14, one end of the wiring harness channel 141 is located on a side end surface of the second fixed shaft 14 away from the motor reducer assembly 20, and the other end of the wiring harness channel 141 is located on the circumferential surface of the second fixed shaft 14 on the inner side of the second end cover 12. The cables of the motor reducer assembly 20 are guided to the outside of the drum shell 10 through the wiring harness channel 141 to avoid interference of the cables with the rotational movement of the drum.

[0026] In summary, the present invention sets three radial support points on the inner side of the cylinder shell 10, that is, two end covers support the two ends of the cylinder shell 10, and the power output unit 28 supports the middle part of the cylinder shell 10. Compared with the traditional scheme, the present invention reduces the axial span between two adjacent support points, and improves the overall strength of the cylinder shell 10 without adding additional reinforcement structure; the present invention sets the power output unit 28 in the middle of the cylinder shell 10, and the torsional stress generated by the driving load is evenly transmitted from the center of the cylinder shell 10 to both ends, which reduces the risk of deformation of the cylinder shell 10 and improves the reliability of power transmission; the present invention uses the expansion of the annular elastic member 31 to achieve a fixed connection between the power output end and the inner wall of the cylinder shell 10. Since the annular elastic member 31 is along the power output unit The outer circumference of 28 is continuously distributed, so when the annular elastic member 31 expands, its outer circumference can be evenly in contact with the inner wall of the cylinder shell 10, thereby ensuring the coaxiality between the power output unit 28 and the inner wall of the cylinder shell 10, and further improving the reliability of power transmission; the present invention utilizes the mutual abutment between the end cover, the fixed shaft, and the motor 21 reducer, and finally realizes the fixation of the axial position of each component through the interference connection force between the end cover and the cylinder shell 10, simplifies the assembly process, and improves the assembly efficiency; the present invention can realize the three-stage deceleration function, so that the power output unit 28 can obtain a larger output torque. On the premise of ensuring the power output performance of the drum, the power and size parameters of the motor 21 can be reduced, the miniaturization design of the drum can be realized, and the manufacturing cost can be reduced at the same time.

[0027] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

[0028] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or with other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

Claims

1. A drum motor assembly, characterized in that: include: A cylindrical shell (10); A motor reducer assembly (20), the motor reducer assembly (20) being accommodated in the cylindrical shell (10), the motor reducer assembly (20) comprising a power output unit (28), an expansion mechanism (30) being provided on the outer peripheral surface of the power output unit (28), the power output unit (28) being interference-connected with a first area of ​​the inner wall of the cylindrical shell (10) via the expansion mechanism (30), the first area being an area close to the center of the cylindrical shell (10) in the axial direction of the cylindrical shell (10); A first fixed shaft (13) and a second fixed shaft (14), wherein the first fixed shaft (13) and the second fixed shaft (14) are respectively circumferentially fixedly connected to two ends of the motor reducer assembly (20), and the first fixed shaft (13) and the second fixed shaft (14) are respectively pressed against the motor reducer assembly (20) from two ends of the motor reducer assembly (20); A first end cover (11) is rotatably connected to the first fixed shaft (13), and the first end cover (11) is pressed against the first fixed shaft (13) from one end of the first fixed shaft (13) away from the motor reducer assembly (20), and the first end cover (11) is interference-connected with the inner wall of the first end of the cylindrical shell (10); The second end cover (12) is rotatably connected to the second fixed shaft (14), and the second end cover (12) is pressed against the second fixed shaft (14) from one end of the second fixed shaft (14) away from the motor reducer assembly (20), and the second end cover (12) is interference-connected with the inner wall of the second end of the cylindrical shell (10).

2. The drum motor assembly according to claim 1, characterized in that: The power output unit (28) is provided with a disc-shaped flange (281) on its outer peripheral surface, and the expansion mechanism (30) comprises an annular elastic member (31) and an annular rigid member (32) stacked in sequence along the axial direction of the power output unit (28) from one end surface of the disc-shaped flange (281), and at least two of the annular elastic members (31) and the annular rigid member (32) are provided respectively, and the annular elastic members (31) and the annular rigid member (32) are alternately arranged along the axial direction of the power output unit (28), and the end closest to the disc-shaped flange (281) is an annular elastic member (31). An annular elastic member (31) is provided, and the end farthest from the disc-shaped flange (281) is an annular rigid member (32); a locking mechanism is provided between the annular rigid member (32) farthest from the disc-shaped flange (281) and the power output unit (28), the locking mechanism being configured to be able to keep the annular rigid member (32) in a state of pressing the annular elastic member (31) and causing the annular elastic member (31) to deform, and when the annular elastic member (31) is deformed, the outer peripheral surface of the annular elastic member (31) protrudes from the outer peripheral surface of the disc-shaped flange (281).

3. The drum motor assembly according to claim 2, characterized in that: The inner circumference of the annular rigid member (32) forms a clearance fit with the outer circumference of the power output unit (28); an annular groove (282) is provided on the outer circumference of the power output unit (28); the locking mechanism comprises a retaining spring (33); the retaining spring (33) is clamped in the annular groove (282), and the retaining spring (33) protrudes from the outer circumference of the power output unit (28); the annular rigid member (32) farthest from the disc-shaped flange (281) abuts against the retaining spring (33).

4. The drum motor assembly according to claim 1, characterized in that: The first end cover (11) is provided with a first through hole for the first fixed shaft (13) to pass through, and a first sinking platform is provided at one end of the first through hole facing the motor reducer assembly (20). A first bearing (15) is provided between the first end cover (11) and the first fixed shaft (13), and an outer ring of the first bearing (15) abuts against the first sinking platform, and an inner ring of the first bearing (15) abuts against a first step (131) provided on the first fixed shaft (13).

5. The drum motor assembly according to claim 4, characterized in that: A first sliding sealing ring (111) is provided between the inner wall of the first through hole and the first fixed shaft (13), a second sink is provided at one end of the first through hole away from the motor reducer assembly (20), and a first sealing end cover (112) is provided in the second sink.

6. The drum motor assembly according to claim 1, characterized in that: The second end cover (12) is provided with a second through hole for the second fixed shaft (14) to pass through, and a third sink is provided at one end of the second through hole facing the motor reducer assembly (20). A second bearing (16) is provided between the second end cover (12) and the second fixed shaft (14), and the outer ring of the second bearing (16) abuts against the third sink, and the inner ring of the second bearing (16) abuts against a second step (142) provided on the second fixed shaft (14).

7. The drum motor assembly according to claim 6, characterized in that: A second sliding sealing ring (121) is provided between the inner wall of the second through hole and the second fixed shaft (14), and a fourth sink is provided at one end of the second through hole away from the motor reducer assembly (20), wherein a second sealing end cover (122) is provided in the fourth sink.

8. The drum motor assembly according to claim 1, characterized in that: The motor reducer assembly (20) comprises a motor (21) and a reducer, wherein the reducer comprises a housing (22), a first gear (24), a second gear (25), a third gear (26) and a fourth gear (27), wherein the first gear (24), the second gear (25), the third gear (26) and the fourth gear (27) are rotatably connected to the housing (22), an output gear (23) is provided on the main shaft of the motor (21), and the power output unit (28) comprises an output gear ring, wherein the first gear (24) and the second gear (25) are coaxially fixedly arranged, the third gear (26) and the fourth gear (27) are coaxially fixedly arranged, the first gear (24) is meshed with the output gear (23), the second gear (25) is meshed with the third gear (26), and the fourth gear (27) is meshed with the output gear ring.

9. The drum motor assembly according to claim 8, characterized in that: A first plug hole is provided at one end of the housing (22) away from the motor (21), and a second plug hole is provided at one end of the motor (21) away from the reducer. The first fixed shaft (13) passes through the output gear ring and is inserted into the first plug hole, and a first key body (17) is provided between the first fixed shaft (13) and the first plug hole. The second fixed shaft (14) is inserted into the second plug hole, and a second key body (18) is provided between the second fixed shaft (14) and the second plug hole. The first fixed shaft (13) is provided with a third step (132) abutting against an end surface of the housing (22), and the second fixed shaft (14) is provided with a fourth step (143) abutting against an end surface of the motor (21).

10. The drum motor assembly according to claim 6, characterized in that: A wiring harness channel (141) is provided inside the second fixed shaft (14), one end of the wiring harness channel (141) is located on an end surface of the second fixed shaft (14) away from the motor reducer assembly (20), and the other end of the wiring harness channel (141) is located on a circumferential surface of the second fixed shaft (14) inside the second end cover (12), and the cables of the motor reducer assembly (20) are guided to the outside of the cylindrical shell (10) through the wiring harness channel (141).

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