Motorized worm drive

Abstract

The application discloses a motor worm drive device and relates to the technical field of motor manufacturing.The motor worm drive device comprises a motor shell and an end cover, a fixed column is arranged on the side of the end cover facing the motor shell, an inner stator is arranged on the outer side of the fixed column, a magnetic ring is arranged on the inner side wall of the motor shell around the edge of the inner stator, a rotating shaft is arranged on the end cover in the axial direction of the end cover, the rotating shaft is fixedly connected with the motor shell, a worm is arranged on the end of the rotating shaft away from the motor shell, a positioning hole one is arranged on the end of the worm close to the rotating shaft, a fixed hole corresponding to the positioning hole one is arranged in the rotating shaft, and a long handle bolt is inserted into the fixed hole and is screw-connected with the positioning hole one. According to the electromagnetic induction principle, the magnetic ring is rotated to rotate the motor shell and the rotating shaft, the long handle bolt is inserted into the fixed hole and is screw-connected with the positioning hole one of the worm, the coaxiality of the worm and the rotating shaft is ensured, the relative displacement of the worm and the rotating shaft does not occur in the transmission process, and the transmission stability and reliability are improved.

Description

Technical Field

[0001] This application relates to the field of electric motor manufacturing technology, and in particular to worm gear drive devices for electric motors. Background Technology

[0002] Miniature brushless worm gear motor drives are widely used in micro-precision equipment, portable automated instruments, and small household appliance transmission systems. Their core requirement is to achieve efficient power output and stable transmission within a limited space. Leveraging the advantages of brushless motors—no commutator wear, long lifespan, and high efficiency—and combining the speed reduction and torque amplification characteristics of worm gear drives, they meet the requirements of miniaturized devices for low power consumption and high reliability.

[0003] Current mainstream motor-worm gear drive devices adopt an integrated design, combining the motor and worm gear reducer in the same housing. The motor shaft of the servo motor is connected to the worm gear using a keyed connection, interference fit, or spline connection, and the servo motor drives the worm gear to rotate.

[0004] Regarding the aforementioned technologies, the inventors believe that the existing technology often uses keyed connections, interference fits, or spline connections to connect the worm gear and the motor shaft. Under long-term impact loads, these connections are prone to loosening or axial disengagement, reducing transmission efficiency. Utility Model Content

[0005] The purpose of this application is to provide a worm gear drive device for motors to improve the problem that the connection between the worm and the motor shaft, which is often a key connection, interference fit, or spline connection, is prone to wear, loosening, or axial disengagement under long-term impact loads, thus reducing transmission efficiency.

[0006] The worm gear drive device for motors provided in this application adopts the following technical solution: A worm gear drive for a motor includes a motor housing and an end cover. A fixing post extends from the end cover toward the motor housing, and an inner stator is located on the outer side of the fixing post. A magnetic ring is arranged around the edge of the inner stator on the inner sidewall of the motor housing. A rotating shaft is rotatably mounted on the end cover along its axial direction. The rotating shaft is fixedly connected to the motor housing. A worm gear is located at the end of the rotating shaft away from the motor housing. A positioning hole is formed at the end of the worm gear near the rotating shaft. A fixing hole corresponding to the positioning hole is formed in the rotating shaft, and a long-shank bolt threaded into the fixing hole is inserted into the fixing hole.

[0007] By adopting the above technical solution, the inner stator and the magnetic ring cooperate to convert electrical energy into mechanical energy through the principle of electromagnetic induction. After the end cover is fixed, the magnetic ring rotates the motor housing, causing the rotating shaft to drive the worm gear to rotate. By inserting a long-shank bolt into the fixing hole of the rotating shaft and threading it into the positioning hole of the worm gear, the coaxiality of the worm gear and the rotating shaft is ensured, enabling the worm gear to accurately transmit the power of the rotating shaft. This ensures that there will be no relative displacement between the worm gear and the rotating shaft during transmission, thereby improving the transmission stability and reliability of the device.

[0008] Optionally, the fixed column has a mounting hole along its axial direction, a bearing connected to the rotating shaft is provided in the mounting hole, and a baffle plate corresponding to the rotating shaft is provided on the inner side wall of the mounting hole, and a clearance hole with a diameter larger than the diameter of the rotating shaft is provided in the baffle plate.

[0009] By adopting the above technical solution, a bearing connected to the rotating shaft is installed in the mounting hole, which reduces the frictional resistance when the rotating shaft rotates; the baffle plate limits the bearing, and the diameter of the clearance hole is larger than the diameter of the rotating shaft, which provides sufficient space for the rotation of the rotating shaft, avoids interference between the rotating shaft and the baffle plate, and also facilitates the installation and disassembly of the rotating shaft.

[0010] Optionally, the bearings are respectively disposed on both sides of the barrier plate, corresponding to the inner sidewall of the mounting hole.

[0011] By adopting the above technical solution, the bearings on both sides jointly support the rotating shaft, which can effectively disperse the force generated during the transmission process, reduce the load on a single bearing, extend the service life of the bearing, and thus improve the reliability and durability of the entire motor worm gear drive device.

[0012] Optionally, a shim corresponding to the rotating shaft is provided on the side of the motor housing near the bearing, and the shim abuts against the inner ring of the bearing.

[0013] By adopting the above technical solution, the shim plays an axial positioning role for the inner ring of the bearing near the motor housing, preventing the bearing from colliding with the motor housing. At the same time, it adjusts the gap between the bearing and the motor housing, reducing the vibration and noise caused by improper bearing clearance, and improving the smooth operation of the device.

[0014] Optionally, the rotating shaft has a locking groove on the side of the bearing near the worm, and a shaft retainer spring is engaged in the locking groove to abut against the inner ring of the bearing near the worm.

[0015] By adopting the above technical solution, the shaft retainer is inserted into the engagement groove of the rotating shaft to axially fix the bearing on the other side of the barrier plate, preventing the inner ring of the bearing from moving towards the worm gear and ensuring that the bearing is reliably fixed in position on the rotating shaft.

[0016] Optionally, the rotating shaft has a second positioning hole that communicates with the fixing hole at one end near the worm, and the end of the worm has a positioning post that fits against the inner wall of the second positioning hole. The first positioning hole is opened at the end of the positioning post and corresponds to the fixing hole.

[0017] By adopting the above technical solution, the positioning pin fits into the inner wall of the second positioning hole, so that the worm and the rotating shaft are accurately positioned, ensuring that the axis of the worm and the axis of the rotating shaft coincide, improving the coaxiality of the worm and the rotating shaft; reducing vibration and noise caused by coaxiality deviation, and ensuring transmission efficiency and transmission accuracy.

[0018] Optionally, a limiting groove is formed on the inner side wall of the second positioning hole, and a limiting protrusion is provided on the side wall of the positioning post for insertion into the limiting groove, with the edge of the limiting protrusion corresponding to the outer side of the rotating shaft.

[0019] By adopting the above technical solution, the limiting groove and the limiting protrusion cooperate to limit the circumferential rotation of the worm relative to the rotating shaft, prevent the worm from circumferentially displacing on the rotating shaft, and ensure that there is no relative rotation between the worm and the rotating shaft.

[0020] Optionally, the end cover has a fixing groove, in which a wire electrically connected to the coil in the inner stator is provided, and a terminal buckle is provided at the end of the wire.

[0021] By adopting the above technical solution, the fixed groove provides a fixed path for the wires, avoids the wires from being distributed messily inside the device, reduces friction and interference between the wires and other components, and improves the neatness and safety of the internal structure of the device.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The inner stator and magnetic ring work together to convert electrical energy into mechanical energy through the principle of electromagnetic induction. After the end cover is fixed, the magnetic ring rotates the motor housing, causing the rotating shaft to drive the worm gear to rotate. A long-shank bolt is inserted into the fixing hole of the rotating shaft and threaded into the positioning hole of the worm gear to ensure the coaxiality of the worm gear and the rotating shaft. This allows the worm gear to accurately transmit the power of the rotating shaft and ensures that there is no relative displacement between the worm gear and the rotating shaft during transmission, thereby improving the transmission stability and reliability of the device. 2. The positioning pin fits against the inner wall of the second positioning hole, so that the worm and the rotating shaft are accurately positioned, ensuring that the axis of the worm and the axis of the rotating shaft coincide, improving the coaxiality of the worm and the rotating shaft; reducing vibration and noise caused by coaxiality deviation, and ensuring transmission efficiency and transmission accuracy; 3. The limiting groove and the limiting protrusion cooperate to limit the circumferential rotation of the worm relative to the rotating shaft, preventing the worm from undergoing circumferential displacement on the rotating shaft, thereby ensuring that there is no relative rotation between the worm and the rotating shaft. Attached Figure Description

[0023] Figure 1 This is an overall schematic diagram of the motor worm gear drive device; Figure 2 This is a partial sectional view of a motor worm gear drive device; Figure 3 yes Figure 2 A magnified view of part A in the middle.

[0024] In the diagram, 1. Motor housing; 11. Gasket; 2. End cover; 21. Fixing post; 22. Mounting hole; 23. Bearing; 24. Barrier plate; 25. Clearance hole; 26. Fixing groove; 3. Inner stator; 4. Magnetic ring; 5. Rotating shaft; 51. Fixing hole; 52. Engaging groove; 53. Shaft retainer; 54. Positioning hole two; 55. Limiting groove; 6. Worm gear; 61. Positioning hole one; 62. Positioning post; 63. Limiting protrusion; 7. Long shank bolt; 8. Wire; 81. Terminal buckle. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 - Appendix Figure 3 This application will be described in further detail below.

[0026] worm gear drive device for electric motor, refer to Figure 1 and Figure 2 The device includes a motor housing 1 and an end cover 2. A fixing post 21, integrally formed with the end cover 2, extends from the side of the end cover 2 facing the motor housing 1. An inner stator 3 is keyed to the outer wall of the fixing post 21. A magnetic ring 4 is fastened and bonded to the inner wall of the motor housing 1 around the edge of the inner stator 3. A rotating shaft 5 is rotatably provided on the end cover 2 along its axial direction. The rotating shaft 5 is keyed to the motor housing 1. A mounting hole 22 is opened on the fixing post 21 along its axial direction. A bearing 23, which is connected to the rotating shaft 5, is installed in the mounting hole 22. A baffle plate 24, integrally formed with the fixing post 21, is provided on the inner wall of the mounting hole 22. The baffle plate 24 corresponds to the rotating shaft 5. The bearings 23 are respectively installed on both sides of the baffle plate 24, corresponding to the inner wall of the mounting hole 22, to jointly support the rotating shaft 5.

[0027] Reference Figure 2 and Figure 3 The baffle plate 24 has a clearance hole 25 with a diameter larger than that of the rotating shaft 5, which provides sufficient space for the rotation of the rotating shaft 5, avoids interference between the rotating shaft 5 and the baffle plate 24, and also facilitates the installation and disassembly of the rotating shaft 5. A shim 11 is installed on the side of the motor housing 1 near the bearing 23, which fits against the circumferential side wall of the rotating shaft 5. The shim 11 abuts against the inner ring of the bearing 23 to prevent the bearing 23 from colliding with the motor housing 1. At the same time, it adjusts the gap between the bearing 23 and the motor housing 1 to reduce the vibration and noise caused by improper gap of the bearing 23.

[0028] Reference Figure 2 and Figure 3 A worm gear 6 is provided at the end of the rotating shaft 5 away from the motor housing 1. A positioning hole 61 is provided at the end of the worm gear 6 near the rotating shaft 5. A fixing hole 51 corresponding to the positioning hole 61 is provided in the rotating shaft 5. A long-shank bolt 7 threadedly connected to the positioning hole 61 is inserted into the fixing hole 51. A locking groove 52 is provided on the side of the rotating shaft 5 near the bearing 23 of the worm gear 6. A shaft retainer 53, which abuts against the inner ring of the bearing 23 near the worm gear 6, is engaged in the locking groove 52. A second positioning hole 54 communicating with the fixing hole 51 is provided at the end of the rotating shaft 5 near the worm gear 6. An integrally formed positioning post 62 is provided at the end of the worm gear 6 for positioning... The column 62 fits into the second positioning hole 54. The first positioning hole 61 is opened at the end of the positioning column 62 and corresponds to the fixing hole 51. The inner side wall of the second positioning hole 54 is provided with a limiting groove 55. The side wall of the positioning column 62 is provided with a limiting protrusion 63 that is inserted into the limiting groove 55. The limiting protrusion 63 is integrally formed with the positioning column 62. The edge of the limiting protrusion 63 corresponds to the outer side of the rotating shaft 5 to prevent the worm 6 from circumferentially displacing on the rotating shaft 5 and to ensure that there is no relative rotation between the worm 6 and the rotating shaft 5. The end cover 2 is provided with a fixing groove 26. A wire 8 that is electrically connected to the coil in the inner stator 3 is installed in the fixing groove 26. The end of the wire 8 is electrically connected to a terminal buckle 81.

[0029] The implementation principle of this application embodiment is as follows: Insert the positioning pin 62 at the end of the worm gear 6 into the positioning hole 54 of the rotating shaft 5, and insert the limiting protrusion 63 on the side wall of the positioning pin 62 into the limiting groove 55 of the rotating groove. Then, insert the long shank bolt 7 from the end of the rotating shaft 5 away from the worm gear 6 into the fixing hole 51 of the rotating shaft 5, so that the long shank bolt 7 is threadedly connected to the positioning hole 61 in the positioning pin 62, thereby fixing the worm gear 6 and making the worm gear 6 and the rotating shaft 5 coaxial. After fixing the end cover 2, connect the terminal buckle 81 to the terminal on the power supply to power on the motor. This causes the magnetic ring 4 to rotate around the inner stator 3 under electromagnetic action, causing the motor housing 1 to rotate with the rotating shaft 5, and thus the worm gear 6 to rotate. By inserting the long shank bolt 7 into the fixing hole 51 and threading it into the positioning hole 61 of the worm gear 6, the coaxiality of the worm gear 6 and the rotating shaft 5 is ensured, and the relative displacement between the worm gear 6 and the rotating shaft 5 is prevented during transmission, thereby improving the transmission stability and reliability.

[0030] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A worm gear drive device for electric motors, characterized in that: The device includes a motor housing (1) and an end cap (2). The end cap (2) has a fixing post (21) extending towards the side of the motor housing (1). An inner stator (3) is provided on the outside of the fixing post (21). A magnetic ring (4) is provided around the edge of the inner stator (3) on the inner sidewall of the motor housing (1). The end cap (2) has a rotating shaft (5) rotatably mounted along its axial direction. The rotating shaft (5) is fixedly connected to the motor housing (1). A worm gear (6) is provided at the end of the rotating shaft (5) away from the motor housing (1). A positioning hole (61) is provided at the end of the worm gear (6) near the rotating shaft (5). A fixing hole (51) corresponding to the positioning hole (61) is provided in the rotating shaft (5). A long shank bolt (7) threadedly connected to the positioning hole (61) is inserted into the fixing hole (51).

2. The motor worm gear drive device according to claim 1, characterized in that: The fixed column (21) has an installation hole (22) along its axial direction. A bearing (23) connected to the rotating shaft (5) is provided in the installation hole (22). A baffle plate (24) corresponding to the rotating shaft (5) is provided on the inner side wall of the installation hole (22). A clearance hole (25) with a diameter larger than the shaft diameter of the rotating shaft (5) is provided in the baffle plate (24).

3. The motor worm gear drive device according to claim 2, characterized in that: The bearings (23) are respectively disposed on both sides of the barrier plate (24) and corresponding to the inner sidewall of the mounting hole (22).

4. The motor worm gear drive device according to claim 3, characterized in that: The motor housing (1) is provided with a shim (11) corresponding to the rotating shaft (5) on the side near the bearing (23), and the shim (11) abuts against the inner ring of the bearing (23).

5. The motor worm gear drive device according to claim 4, characterized in that: The rotating shaft (5) has a locking groove (52) on the side of the bearing (23) near the worm (6), and a shaft retainer (53) is engaged in the locking groove (52) to abut against the inner ring of the bearing (23) near the worm (6).

6. The motor worm gear drive device according to claim 5, characterized in that: The rotating shaft (5) has a positioning hole two (54) at one end near the worm (6) that communicates with the fixing hole (51). The end of the worm (6) is provided with a positioning post (62) that fits against the inner wall of the positioning hole two (54). The positioning hole one (61) is opened at the end of the positioning post (62) and corresponds to the fixing hole (51).

7. The motor worm gear drive device according to claim 6, characterized in that: The inner wall of the second positioning hole (54) is provided with a limiting groove (55), and the side wall of the positioning post (62) is provided with a limiting protrusion (63) for inserting into the limiting groove (55). The edge of the limiting protrusion (63) corresponds to the outer side of the rotating shaft (5).

8. The motor worm gear drive device according to claim 7, characterized in that: The end cap (2) has a fixing groove (26), and a wire (8) electrically connected to the coil in the inner stator (3) is provided in the fixing groove (26). A terminal buckle (81) is provided at the end of the wire (8).

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