A power unit integrating a low-tooth-difference reducer and a motor

Abstract

This invention discloses an integrated power device combining a low-tooth-difference reducer and a motor, comprising a motor, a housing, and an output shaft coaxially arranged, with the housing rotatably connected to the output shaft. The housing has a hollow cavity inside, into which the motor output shaft extends and is linked via a reduction mechanism. A camshaft is connected to one end of the motor output shaft near the output shaft. The reduction mechanism includes a needle roller bearing mounted on the camshaft, a drive gear mounted on the needle roller bearing, and a transmission assembly installed between the drive gear and the output shaft. The inner wall of the housing has an internal gear ring, with the drive gear meshing with the internal gear ring using low-tooth-difference gears. This invention improves transmission stability and efficiency by designing the motor output shaft and camshaft as an integrated unit, while also making the space more compact. The drive gear and output shaft are driven by transmission steel balls, allowing the output end to directly bear radial force. The structure is simplified, with fewer parts, easier control of part machining accuracy, and lower manufacturing costs.

Description

Technical Field

[0001] This invention belongs to the field of mechanical transmission technology, specifically relating to an integrated power device combining a low-tooth-difference reducer and a motor. Background Technology

[0002] Speed ​​reducers are usually used in conjunction with motors and are involved in various fields. They mainly work together with motors to complete pre-set actions. In particular, the combination of speed reducers and motors presents many challenges in fields such as AGV warehouse robots and robotic arms.

[0003] Currently, reducers and motors are separate entities, connected via pre-defined connection methods. This connection method occupies too much space. In fields with extremely strict space requirements, such as AGVs and robotic arms, the traditional structure is no longer applicable. Different types of reducers are required in different parts, which also leads to changes in the connection method with the motor. This results in product variety and increases production costs. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide an integrated power device combining a low-tooth-difference reducer and a motor. This device can replace the function of planetary and parallel reducers, while also being compact in structure, occupying little space, and having a wide range of applications.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A low-tooth-difference reducer integrated with a motor power unit includes a motor, a housing, and an output shaft coaxially arranged, with the housing rotatably connected to the output shaft. The interior of the housing is a hollow receiving cavity, into which the motor output shaft extends and is linked to the output shaft via a reduction mechanism. A camshaft is connected to one end of the motor output shaft near the output shaft. The reduction mechanism includes a needle roller bearing sleeved on the camshaft, a drive gear sleeved on the needle roller bearing, and a transmission assembly installed between the drive gear and the output shaft. The inner wall of the housing has an internal gear ring, the number of teeth of which is greater than the number of teeth of the drive gear, and the drive gear and the internal gear ring form a low-tooth-difference meshing.

[0007] As a preferred technical solution, the transmission assembly includes a first ball groove group and a second ball groove group respectively formed on the opposite end faces of the drive gear and the output shaft, and transmission steel balls located in the space formed by splicing the first ball groove group and the second ball groove group; the first ball groove group includes a plurality of uniformly arranged first ball grooves, and the second ball groove group includes a plurality of uniformly arranged second ball grooves, the first ball grooves and the second ball grooves have the same structure and the same number; the second ball groove includes a gap portion in the middle and hemispherical arc portions symmetrically distributed on both sides of the gap portion, and the first ball grooves and the second ball grooves are spliced ​​perpendicularly to each other. More preferably, the number of first ball grooves and second ball grooves is eight, and the number of transmission steel balls is eight.

[0008] As a preferred technical solution, a first annular receiving groove is formed on the circumference of the end of the output shaft near the housing, and a second annular receiving groove adapted to the first annular receiving groove is formed on the inner wall of the housing; a rolling steel ball is placed in the space formed by the splicing of the first and second annular receiving grooves; the housing and the output shaft are rotatably connected by the rolling steel ball. The rolling steel ball acts as a rotary bearing, which is simple in structure and provides stable and reliable rotation. More preferably, the longitudinal section of the first and second annular receiving grooves is V-shaped.

[0009] As a preferred technical solution, the housing has a mounting hole that communicates with the second annular receiving groove, the size of which is adapted to the size of the rolling steel ball; an internally threaded cylindrical pin and a plug are connected inside the mounting hole for sealing the mounting hole. During assembly, the rolling steel ball is placed into the space formed by the splicing of the first and second annular receiving grooves through the mounting hole, and then sealed by the plug and the internally threaded cylindrical pin.

[0010] As a preferred technical solution, the camshaft and the motor output shaft are integrally formed.

[0011] As a preferred technical solution, a second annular receiving groove is further formed on the circumference of the end of the output shaft near the housing, and a Glyd ring is placed in the second annular receiving groove. The Glyd ring plays a sealing role between the output shaft and the housing, improving the sealing effect of the device.

[0012] As a preferred technical solution, a connecting part is fixedly connected to the end face of the camshaft near the output shaft, and a deep groove ball bearing is sleeved on the connecting part. A connecting hole is opened in the middle of the end face of the output shaft near the connecting part, and the connecting hole is adapted to the deep groove ball bearing. The output shaft is rotatably connected to the connecting part through the deep groove ball bearing.

[0013] As a preferred technical solution, the motor further includes an input end cover and a thrust bearing sleeved on the motor output shaft, the thrust bearing being located between the drive gear and the input end cover; the input end cover and the housing are fixedly connected to the motor by hexagonal socket head cap bolts. By placing the thrust bearing between the drive gear and the input end cover, the axial movement of the drive gear can be counteracted.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] This invention integrates the motor output shaft and camshaft into a single structure, reducing the need for transitional connections such as the splined connection between the ordinary motor output shaft and the input end of the low-tooth-difference reducer. This significantly improves transmission stability, greatly reduces energy consumption, and increases transmission efficiency, while also making the space more compact. Furthermore, the transmission between the drive gear and the output shaft is achieved through transmission steel balls, resulting in a noticeable transmission effect and a substantial reduction in longitudinal space. This also allows the output end to directly withstand radial forces. Overall, this device simplifies the internal structure of the motor and reducer, resulting in fewer parts, easier control over part machining accuracy, lower manufacturing costs, smaller transmission errors, better precision stability, and a wider range of applications. Attached Figure Description

[0016] Figure 1 An exploded view of the integrated power device combining a low-tooth-difference reducer and a motor provided by the present invention.

[0017] Figure 2 A cross-sectional view of the integrated power device combining a low-tooth-difference reducer and a motor provided by the present invention;

[0018] Figure 3 This is a schematic diagram of the shell structure;

[0019] Figure 4 This is a schematic diagram of the mating structure between the housing and the drive gear;

[0020] Figure 5 This is a side view of the driving gear;

[0021] Figure 6 This is a side view of the output shaft;

[0022] Figure 7 This is the isometric view of the output shaft;

[0023] Figure 8 Schematic diagram of the second ball groove;

[0024] Reference numerals: 1-Motor, 11-Motor output shaft, 12-Camshaft, 13-Connecting part, 2-Housing, 21-Receiving cavity, 22-Internal gear ring, 23-Mounting hole, 24-Internal threaded cylindrical pin, 25-Plug, 3-Output shaft, 31-Connecting hole, 4-Needle roller bearing, 5-Drive gear, 61-First ball groove, 62-Second ball groove, 621-Clearing part, 622-Hemispherical arc part, 63-Transmission steel ball, 71-First annular receiving groove, 72-Second annular receiving groove, 73-Rolling steel ball, 8-Glyd ring, 9-Deep groove ball bearing, 10-Input end cover, 100-Thrust bearing, 101-Hex socket head cap bolt. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] like Figure 1-8 As shown, a power device integrating a low-tooth-difference reducer and a motor includes a motor 1, a housing 2, and an output shaft 3 coaxially arranged, with the housing 2 rotatably connected to the output shaft 3. In one embodiment, a first annular receiving groove 71 is formed on the circumference of the end of the output shaft 3 near the housing 2, and a second annular receiving groove 72 adapted to the first annular receiving groove 71 is formed on the inner wall of the housing 2. A rolling steel ball 73 is placed in the space formed by the splicing of the first annular receiving groove 71 and the second annular receiving groove 72. The housing 2 and the output shaft 3 are rotatably connected via the rolling steel ball 73. The rolling steel ball 73 acts as a rotary bearing, with a simple structure and stable and reliable rotation. Furthermore, the longitudinal section of the first annular receiving groove and the second annular receiving groove is V-shaped.

[0027] The interior of the housing 2 is a hollow cavity 21. The motor output shaft 11 extends into the cavity 21 and is linked to the output shaft 3 through a reduction mechanism. A camshaft 12 is connected to one end of the motor output shaft 11 near the output shaft 3. The camshaft 12 and the motor output shaft 11 are integrally formed. The reduction mechanism includes a needle roller bearing 4 sleeved on the camshaft 12, a drive gear 5 sleeved on the needle roller bearing 4, and a transmission assembly installed between the drive gear 5 and the output shaft 3. The transmission assembly includes a first ball groove group and a second ball groove group respectively opened on the opposite end faces of the drive gear 5 and the output shaft 3, and a transmission steel ball 63 placed in the space formed by splicing the first ball groove group and the second ball groove group. The first ball groove group includes a plurality of uniformly arranged first ball grooves 61, and the second ball groove group includes a plurality of uniformly arranged second ball grooves 62. The first ball grooves 61 and the second ball grooves 62 have the same structure and the same number. The second ball groove includes a gap in the middle and hemispherical arc-shaped parts symmetrically distributed on both sides of the gap. The first ball grooves 61 and the second ball grooves 62 are spliced ​​perpendicularly to each other. In one embodiment, the eccentricity of the camshaft 12 is 1.5mm. Therefore, under the drive of the camshaft, the trajectory of the center point of the drive gear is a circle with a diameter of 3mm. Thus, the width of the gap in the second ball groove is designed to be 3mm to allow the transmission steel ball 63 to move. The selected transmission steel ball 63 has a diameter of 5mm, and the radius of the hemispherical arc portion is 2.5mm, which matches the size of the transmission steel ball 63. More preferably, there are eight first ball grooves 61 and eight second ball grooves 62, and eight transmission steel balls 63. The inner wall of the housing 2 has an internal gear ring 22, the number of teeth of which is greater than the number of teeth of the drive gear 5. The drive gear 5 and the internal gear ring 22 form a small-difference tooth meshing.

[0028] A connecting portion 13 is fixedly connected to the end face of the camshaft 12 near the output shaft 3. A deep groove ball bearing 9 is fitted onto the connecting portion 13. A connecting hole 31 is opened in the middle of the end face of the output shaft 3 near the connecting portion 13, and the connecting hole 31 is adapted to the deep groove ball bearing 9. The output shaft 3 is rotatably connected to the connecting portion 13 through the deep groove ball bearing 9. The motor 1 also includes an input end cover 10 and a thrust bearing 100 fitted onto the motor output shaft 11. The thrust bearing 100 is located between the drive gear 5 and the input end cover 10. The input end cover 10 and the housing 2 are fixedly connected to the motor 1 by hexagon socket head cap bolts 101. By placing the thrust bearing 100 between the drive gear 5 and the input end cover 10, the axial movement of the drive gear 5 can be counteracted.

[0029] To facilitate the installation of the rolling steel ball 73, the housing 2 has a mounting hole 23 that communicates with the second annular receiving groove 72. The size of the mounting hole 23 is adapted to the size of the rolling steel ball 73. An internally threaded cylindrical pin 24 and a plug 25 for sealing the mounting hole are connected inside the mounting hole 23. During assembly, the rolling steel ball 73 is placed into the space formed by the first annular receiving groove 71 and the second annular receiving groove 72 through the mounting hole 23, and then sealed using the plug 25 and the internally threaded cylindrical pin 24. To improve the sealing effect of the device, a second annular receiving groove 72 is also provided on the circumference of the output shaft 3 near the end of the housing 2. A Gladley ring 8 is placed inside the second annular receiving groove 72, and the Gladley ring 8 provides a good seal between the output shaft 3 and the housing 2.

[0030] The working principle of this device is as follows: the motor output shaft 11 and the camshaft 12 are integrally connected. When the motor 1 starts, the motor output shaft 11 and the camshaft 12 rotate simultaneously. The camshaft 12 drives the drive gear 5 to rotate. The drive gear 5 meshes with the internal gear ring 22 of the housing 2, producing a speed reduction effect. The drive gear 5 transmits torque to the output shaft 3 and drives it to rotate through the transmission steel ball 63 moving in the first ball groove 61, thus outputting the rotational speed. In this invention, the drive gear 5 and the output shaft 3 are transmitted through the transmission steel ball 63, resulting in a significant transmission effect. At the same time, the longitudinal space is greatly reduced, and the output end can directly bear the radial force. By designing the motor output shaft 11 and the camshaft 12 as an integral structure, this invention integrates the motor and the low-tooth-difference reducer, making the internal structure of the device compact and significantly reducing the space occupied by the device.

Claims

1. A power device integrating a low-tooth-difference reducer and a motor, characterized in that: The device includes a motor, a housing, and an output shaft arranged coaxially, with the housing rotatably connected to the output shaft. The interior of the housing is a hollow cavity into which the motor output shaft extends and is linked to the output shaft via a reduction mechanism. A camshaft is connected to one end of the motor output shaft near the output shaft. The reduction mechanism includes a needle roller bearing mounted on the camshaft, a drive gear mounted on the needle roller bearing, and a transmission assembly installed between the drive gear and the output shaft. The inner wall of the housing has an internal gear ring with a number of teeth greater than the number of teeth on the drive gear, and the drive gear meshes with the internal gear ring with a small difference in teeth. The transmission assembly includes a first ball groove group and a second ball groove group respectively opened on the opposite end faces of the drive gear and the output shaft, and a transmission steel ball located in the space formed by splicing the first ball groove group and the second ball groove group. The first ball groove group includes a plurality of first ball grooves evenly arranged, and the second ball groove group includes a plurality of second ball grooves evenly arranged. The first ball grooves and the second ball grooves have the same structure and the same number. The second ball groove includes a gap in the middle and hemispherical arc-shaped parts symmetrically distributed on both sides of the gap. The first ball grooves and the second ball grooves are vertically opposite to each other. A first annular receiving groove is provided on the periphery of the end of the output shaft near the housing, and a second annular receiving groove adapted to the first annular receiving groove is provided on the inner wall of the housing; a rolling steel ball is placed in the space formed by the splicing of the first annular receiving groove and the second annular receiving groove; the housing and the output shaft are rotatably connected by the rolling steel ball.

2. The integrated power device of low-tooth-difference reducer and motor according to claim 1, characterized in that: The number of the first ball groove and the second ball groove is eight, and the number of the transmission steel balls is eight.

3. The integrated power device of low-tooth-difference reducer and motor according to claim 1, characterized in that: The longitudinal sections of the first and second annular receiving grooves are V-shaped.

4. The integrated power device of low-tooth-difference reducer and motor according to claim 1, characterized in that: The housing has an installation hole that communicates with the second annular receiving groove. The size of the installation hole is adapted to the size of the rolling steel ball. An internally threaded cylindrical pin and a plug for plugging the installation hole are connected inside the installation hole.

5. The integrated power device of low-tooth-difference reducer and motor according to any one of claims 1-4, characterized in that: The camshaft and the motor output shaft are integrally formed.

6. The integrated power device of low-tooth-difference reducer and motor according to any one of claims 1-4, characterized in that: A second annular receiving groove is also provided on the periphery of one end of the output shaft near the housing, and a Gladwell ring is placed in the second annular receiving groove.

7. The integrated power device of low-tooth-difference reducer and motor according to any one of claims 1-4, characterized in that: The camshaft has a connecting part fixed to its end face near the output shaft. A deep groove ball bearing is fitted onto the connecting part. A connecting hole is opened in the middle of the end face of the output shaft near the connecting part. The connecting hole is adapted to the deep groove ball bearing. The output shaft is rotatably connected to the connecting part through the deep groove ball bearing.

8. The integrated power device of low-tooth-difference reducer and motor according to any one of claims 1-4, characterized in that: The motor also includes an input end cover and a thrust bearing sleeved on the motor output shaft, with the thrust bearing located between the drive gear and the input end cover; the input end cover and the housing are fixedly connected to the motor by internal hex bolts.

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