Friction torque self-locking gear motor

Abstract

The invention relates to the technical field of motors, in particular to a friction torque self-locking speed reduction motor which comprises a motor and a speed reduction box, the motor is detachably arranged on the speed reduction box, a torque shaft is rotatably arranged on the speed reduction box, a butt strap is installed on the torque shaft, the torque shaft is coaxially sleeved with a worm wheel, and a worm meshed with the worm wheel is rotatably arranged on the speed reduction box. A gear set used for speed reduction is arranged between the worm and the output shaft of the motor, a load protection assembly is arranged in the reduction gearbox, and when the torque shaft stops rotating, the load protection assembly controls the motor to stop rotating. The device has the effects of self-locking, overload prevention and adaptation to different working scenes.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electric machines, in particular to a friction torque self-locking speed reduction motor. BACKGROUND

[0002] In order to be suitable for the travel of disabled people, an airport shuttle bus usually has a rotatable board on the shuttle bus to form a slope for the wheelchair to go up and down.

[0003] In actual use, the board is usually controlled by an electric machine, and the rotation function of the board is realized by controlling the controller by an operator. Since the use scene of the board is different, when the operator controls the electric machine through the controller, it is difficult to control the rotation angle of the board, and when the operator does not control in time, the board will directly collide with the ground and stop rotating at this time, but the electric machine will continue to work at this time, so that the electric machine enters an overload operation state, and thus the electric machine will be damaged in a long-time overload operation state, and therefore an electric machine suitable for different scenes and not easy to be damaged is needed. SUMMARY

[0004] In order to improve the problems existing in the operation of the electric machine on the board, the application provides a friction torque self-locking speed reduction motor.

[0005] The friction torque self-locking speed reduction motor provided by the application adopts the following technical scheme: A friction torque self-locking speed reduction motor, comprising an electric machine and a speed reduction box, the electric machine is detachably arranged on the speed reduction box, a torque shaft is rotatably arranged on the speed reduction box, a board is installed on the torque shaft, a worm wheel is coaxially sleeved on the torque shaft, a worm is rotatably arranged on the speed reduction box and meshes with the worm wheel, a gear set for speed reduction is arranged between the worm and the output shaft of the electric machine, and a load protection assembly is arranged in the speed reduction box, the load protection assembly controls the electric machine to stop rotating when the torque shaft stops rotating; the gear set comprises an output column, an intermediate column and a transmission column; the load protection assembly comprises a screw rod coaxially arranged on the transmission column, a sliding block is threadedly connected to the screw rod, the worm is provided with a through groove at both ends in the axial direction of the worm for sliding of the sliding block, the cross sections of the sliding block and the through groove are both polygonal, a positioning ring seat is rotatably sleeved on both ends of the worm, a stepped groove is formed in the positioning ring seat and used for inserting the end of the worm, a locking piece for fixation is arranged between the positioning ring seat and the speed reduction box, a pressure sensor electrically connected to a control system is arranged on the positioning ring seat at both ends of the worm, and the sliding block is located between the sensing ends of the two pressure sensors.

[0006] By adopting the above technical scheme, the motor drives the worm to rotate through the gear set, the worm drives the torque shaft to rotate through the worm wheel, the torque shaft drives the clamping plate to rotate, and the self-locking effect between the worm wheel and the worm is amplified under the speed reduction ratio transmission of the gear set, so that the motor has the self-locking effect; before the clamping plate hits the ground, the rotation of the torque shaft is not hindered because the clamping plate has not hit the ground at this time; and the cross sections of the sliding block and the through slot are both polygonal, so the screw rod drives the worm to rotate synchronously through the sliding block until the clamping plate hits the ground; at this time, the clamping plate hinders the rotation of the worm wheel through the torque shaft because the ground hinders the rotation of the clamping plate, the worm wheel hinders the rotation of the worm, and the worm is equivalent to being fixed at this time; the transmission column continues to drive the screw rod to rotate, the rotating screw rod drives the sliding block to slide along the axial direction of the screw rod until the sliding block triggers the pressure sensor, the pressure sensor feeds back a signal to the control system, the control system controls the motor to stop working and controls the change of the motor direction, so that the clamping plate meets the requirement of adapting to different terrains, and the safe and stable use of the motor is ensured, so that the overloading operation of the motor is reduced, and the possibility of damage to the motor is reduced.

[0007] Optionally, a first helical gear is coaxially arranged on the output shaft of the motor, a second helical gear is coaxially arranged on the output column and is in meshing connection with the first helical gear, a primary transmission gear is coaxially arranged on the output column, a secondary transmission gear is coaxially arranged on the intermediate column and is in meshing connection with the primary transmission gear, a tertiary transmission gear is coaxially arranged on the intermediate column, a quaternary transmission gear is coaxially arranged on the transmission column and is in meshing connection with the tertiary transmission gear, and the transmission column is coaxially arranged on the worm.

[0008] By adopting the above technical scheme, the output shaft of the motor drives the output column to rotate through the first helical gear and the second helical gear, the output column drives the intermediate column to rotate through the primary transmission gear and the secondary transmission gear, the intermediate column drives the transmission column to rotate through the tertiary transmission gear and the quaternary transmission gear, and the transmission column drives the worm to rotate. Since the first helical gear is arranged on the output shaft of the motor, and the first helical gear and the second helical gear have small noise during transmission, the motor achieves the effect of noise reduction. The multi-stage transmission gears increase the transmission ratio, amplify the self-locking force between the worm wheel and the worm, and reduce the possibility of accidental rotation of the torque shaft.

[0009] Optionally, a first bearing is coaxially arranged on the transmission column, a first C-shaped retainer ring is arranged between the first bearing and the quaternary transmission gear, the first C-shaped retainer ring is used to abut against the outer ring of the first bearing, a first clamping groove for placing the first C-shaped retainer ring is arranged on the inner side wall of the reduction box, a mounting ring is coaxially arranged on one end of the screw rod away from the transmission column, a second bearing is coaxially arranged on the mounting ring, and the first bearing and the second bearing are arranged on the inner side wall of the reduction box.

[0010] By adopting the technical scheme, the resistance of the screw rod rotation is reduced, and the maintenance personnel can conveniently maintain.

[0011] Optionally, the locking member comprises a locking screw threadedly connected between the inner and outer side walls of the reduction box, the locking screw is used to abut against the side wall of the positioning ring seat, a second C-shaped retainer ring is arranged between the positioning ring seat close to the transmission column and the first bearing, the second C-shaped retainer ring is used to abut against the positioning ring seat, a second clamping groove for placing the second C-shaped retainer ring is formed in the inner side wall of the reduction box, the positioning ring seat away from the transmission column abuts against the outer ring of the second bearing, a shaft cover plate is detachably arranged on the reduction box, the shaft cover plate is located at the end of the screw rod away from the transmission column, and the shaft cover plate is used to press the second bearing against the positioning ring seat.

[0012] By adopting the technical scheme, the installation personnel first fix the positioning ring seat close to the transmission column on the inner and outer side walls of the reduction box through the locking screw and the second C-shaped retainer ring, then install the transmission column on the first bearing through the first bearing and the first C-shaped retainer ring, then the worker adjusts the slider on the screw rod and installs the worm sleeve on the slider, so that the end of the worm is inserted into the stepped groove of the positioning ring seat close to the transmission column, then the other positioning ring seat is installed at the other end of the worm, then the second bearing is installed on the inner and outer side walls of the reduction box, and the outer ring of the second bearing abuts against the positioning ring seat installed later, and finally the shaft cover plate is installed to complete the assembly.

[0013] Optionally, the pressure sensor is located in the ring of the positioning ring seat, a wire arranging hole for passing the wire is formed between the inner and outer side walls of the positioning ring seat, a sealing rubber ring is arranged at the wire arranging hole of the positioning ring seat and is sleeved on the wire connected to the pressure sensor, a wire passing hole for passing the wire is formed between the inner and outer side walls of the reduction box, a leakage preventing rubber ring is arranged at the wire passing hole of the reduction box and is sleeved on the wire connected to the pressure sensor, coaxial light shafts are arranged at both ends of the screw rod, one of the light shafts is located between the screw rod and the transmission column, and the other light shaft is coaxially arranged in the mounting ring, an oil sealing rubber ring is arranged on the positioning ring seat and is sleeved on the light shaft, the pressure sensor is located between the two oil sealing rubber rings, an oil sealing rubber ring is sleeved on the output shaft of the motor, the sealing rubber ring abuts against the inner side wall of the reduction box, and a sealing rubber ring is arranged between the positioning ring seat and the end of the worm.

[0014] By adopting the technical scheme, before assembling the positioning ring seat, the gap between the wire harness hole and the wire is filled by the sealing rubber ring, then the wire is passed out from the wire passing hole on the reduction gearbox, and the gap between the wire passing hole and the wire is sealed by the leakage prevention rubber ring, then the oil sealing rubber ring is installed on the light shaft, and the pressure sensor is in a sealed environment through the sealing rubber ring, the sealing rubber ring and the oil sealing rubber ring, so that the influence of the lubricating oil in the reduction gearbox on the precision of the pressure sensor is reduced, and the influence of the lubricating oil in the reduction gearbox on the motor is reduced.

[0015] Optionally, the stepped groove of the positioning ring seat is provided with a metal copper ring, and the metal copper ring is used to abut against the end of the worm.

[0016] By adopting the technical scheme, the frictional resistance between the end of the worm and the positioning ring seat is reduced, and the wear between the worm and the positioning ring seat is reduced.

[0017] Optionally, the transmission column, the light shaft and the screw rod are integrally formed.

[0018] By adopting the technical scheme, the structural strength between the transmission column and the screw rod is improved, so that the screw rod can transmit greater torque.

[0019] In summary, the present application has at least one of the following beneficial technical effects: 1. The motor drives the worm to rotate through the gear set, the worm drives the torque shaft to rotate through the worm gear, the torque shaft drives the clamping plate to rotate, and the self-locking effect between the worm gear and the worm is amplified under the speed reduction ratio transmission of the gear set, so that the motor has a self-locking effect, and when the clamping plate hits the ground, the load protection assembly controls the motor to stop rotating, thereby reducing the occurrence of motor overload operation, and reducing the possibility of damage to the motor. 2. The installer installs the worm between the two positioning ring seats through the locking piece, the transmission column drives the screw rod to rotate, and since the clamping plate has not hit the ground at this time, the rotation of the torque shaft is not hindered, and since the cross section of the sliding block and the through slot is polygonal, the screw rod will drive the worm to rotate synchronously through the sliding block until the clamping plate hits the ground, at which time the clamping plate will hinder the rotation of the worm gear through the torque shaft, and the worm gear will hinder the rotation of the worm, at which time the worm is equivalent to being fixed, and the transmission column will continue to drive the screw rod to rotate, and the rotating screw rod will drive the sliding block to slide along the axial direction of the screw rod until the sliding block triggers the pressure sensor, the pressure sensor feeds back a signal to the control system, the control system controls the motor to stop working and changes the direction of the motor, thereby realizing the requirement that the clamping plate adapts to different terrains, and ensuring the safe and stable use of the motor. 3. Before assembling the positioning ring seat, the gap between the wire hole and the wire is filled with sealing glue ring, then the wire is passed out of the wire hole on the reduction gearbox, and the gap between the wire hole and the wire is sealed through the leak-proof glue ring, then the oil sealing glue ring is installed on the light shaft, the pressure sensor is in a sealed environment through the sealing glue ring, the sealing rubber ring and the oil sealing glue ring, the influence of the lubricating oil in the reduction gearbox on the precision of the pressure sensor is reduced, and the influence of the lubricating oil in the reduction gearbox on the motor is reduced through the oil sealing glue ring. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of an embodiment of the application.

[0021] Figure 2 is a sectional view for embodying the position relationship of the worm gear, the transmission column and the motor in the embodiment of the application.

[0022] Figure 3 is a structural schematic diagram for embodying the position relationship of the second helical gear, the second-stage transmission gear and the fourth-stage transmission gear in the embodiment of the application.

[0023] Figure 4 is a sectional view for embodying the position relationship of the screw rod, the sliding block and the pressure sensor in the embodiment of the application.

[0024] BRIEF DESCRIPTION OF DRAWINGS: 1, motor; 2, reduction gearbox; 201, volute; 202, gear housing; 3, torque shaft; 4, worm gear; 5, worm; 6, gear set; 61, output column; 62, intermediate column; 63, transmission column; 64, first helical gear; 65, second helical gear; 66, first-stage transmission gear; 67, second-stage transmission gear; 68, third-stage transmission gear; 69, fourth-stage transmission gear; 7, load protection assembly; 71, screw rod; 72, sliding block; 73, through slot; 74, positioning ring seat; 75, stepped groove; 76, locking piece; 761, locking screw; 762, second C-shaped retainer ring; 763, second clamping groove; 764, shaft cover plate; 77, pressure sensor; 8, first bearing; 9, first C-shaped retainer ring; 10, first clamping groove; 11, mounting ring; 12, second bearing; 13, wire hole; 14, sealing glue ring; 15, wire; 16, wire hole; 17, leak-proof glue ring; 18, light shaft; 19, oil sealing glue ring; 20, oil sealing glue ring; 21, sealing rubber ring; 22, metal copper ring. DETAILED DESCRIPTION

[0025] The following will be described in detail in combination with the accompanying Figures 1-4 The application will be further described in detail.

[0026] The embodiment of the application discloses a friction torque self-locking reduction motor.

[0027] Refer to Figure 1The friction torque self-locking speed reduction motor comprises a motor 1 and a speed reduction box 2, the motor 1 can adopt a forward and reverse motor 1 in the prior art, the speed reduction box 2 comprises a volute 201 and a gear shell 202, the volute 201 is bolted on the gear shell 202, the motor 1 is bolted on the gear shell 202, the motor 1 is electrically connected to a control system, a torque shaft 3 is rotationally connected to the speed reduction box 2, and a clamping plate (not shown in the figure) is bolted on the torque shaft 3.

[0028] With reference to Figure 2 , a worm wheel 4 is coaxially sleeved on the torque shaft 3, the worm wheel 4 is connected to the torque shaft 3 through a key, a worm 5 is rotationally arranged on the speed reduction box 2 and is in meshing connection with the worm wheel 4, and a gear set 6 for speed reduction is arranged between the worm 5 and an output shaft of the motor 1.

[0029] With reference to Figure 2 and Figure 3 , the gear set 6 comprises an output column 61, an intermediate column 62 and a transmission column 63, a first helical gear 64 is coaxially bolted on the output shaft of the motor 1, a second helical gear 65 in meshing connection with the first helical gear 64 is coaxially connected to the output column 61 through a key, and a primary transmission gear 66 is coaxially connected to the output column 61 through a key.

[0030] With reference to Figure 2 and Figure 3 , the intermediate column 62 is coaxially connected to a secondary transmission gear 67 in meshing connection with the primary transmission gear 66 through a key, the intermediate column 62 is coaxially connected to a tertiary transmission gear 68 through a key, and the transmission column 63 is coaxially connected to a quaternary transmission gear 69 in meshing connection with the tertiary transmission gear 68 through a key, and the transmission column 63 is coaxially arranged on the worm 5.

[0031] A worker starts the motor 1 through the control system, the output shaft of the motor 1 drives the first helical gear 64 to synchronously rotate, the first helical gear 64 drives the output column 61 to rotate through the second helical gear 65, and the output column 61 drives the primary transmission gear 66 to synchronously rotate.

[0032] The primary transmission gear 66 drives the intermediate column 62 to rotate through the secondary transmission gear 67, the intermediate column 62 drives the tertiary transmission gear 68 to synchronously rotate, the tertiary transmission gear 68 drives the transmission column 63 to rotate through the quaternary transmission gear 69, the transmission column 63 drives the worm 5 to rotate, the worm 5 drives the torque shaft 3 to rotate through the worm wheel 4, and the torque shaft 3 drives the clamping plate to rotate.

[0033] Since the noise generated by the helical gear in the transmission process is small, the first helical gear 64 and the second helical gear 65 realize the noise reduction effect of the motor 1 in the transmission process, and the self-locking force between the worm wheel 4 and the worm 5 is amplified under the transmission torque of the multi-stage transmission gear, so that the clamping plate cannot easily rotate reversely.

[0034] With reference to Figure 2 andFigure 4 A load protection assembly 7 is arranged in the reduction gearbox 2, and when the torque shaft 3 stops rotating, the load protection assembly 7 controls the motor 1 to stop rotating. The load protection assembly 7 comprises a screw rod 71 coaxially arranged on the transmission column 63, and a sliding block 72 threadedly connected to the screw rod 71. The screw rod 71 is provided with a through groove 73 at both ends in the axial direction of the screw rod 71, and the sliding block 72 and the through groove 73 are both polygonal in cross section.

[0035] Referring to Figure 2 and Figure 4 The two ends of the worm 5 are rotatably sleeved with positioning ring seats 74, the positioning ring seats 74 are provided with stepped grooves 75 for inserting the ends of the worm 5, and metal copper rings 22 are arranged in the stepped grooves 75 of the positioning ring seats 74 and used for abutting against the ends of the worm 5.

[0036] Referring to Figure 2 and Figure 4 The positioning ring seats 74 at the two ends of the worm 5 are both bolted with pressure sensors 77 electrically connected to a control system, the pressure sensors 77 are located in the rings of the positioning ring seats 74, the sliding block 72 is located between the sensing ends of the two pressure sensors 77, and the inner and outer sidewalls of the positioning ring seats 74 are provided with wire arranging holes 13 for the wires 15 to pass through.

[0037] Referring to Figure 2 and Figure 4 The wire arranging holes 13 of the positioning ring seats 74 are arranged with sealing rubber rings 14, the sealing rubber rings 14 are sleeved on the wires 15 connected to the pressure sensors 77, the inner and outer sidewalls of the reduction gearbox 2 are provided with wire passing holes 16 for the wires 15 to pass through, and the wire passing holes 16 of the reduction gearbox 2 are arranged with leakproof rubber rings 17, the leakproof rubber rings 17 are sleeved on the wires 15 connected to the pressure sensors 77. The sealing rubber rings 14 and the leakproof rubber rings 17 can both be made of silicone rubber material in the prior art.

[0038] Referring to Figure 2 and Figure 4 The transmission column 63 is coaxially sleeved with a first bearing 8, a first C-shaped retainer ring 9 is arranged between the first bearing 8 and the fourth-stage transmission gear 69, the first C-shaped retainer ring 9 is used for abutting against the outer ring of the first bearing 8, and the inner sidewall of the reduction gearbox 2 is provided with a first clamping groove 10 for placing the first C-shaped retainer ring 9.

[0039] Referring to Figure 2 and Figure 4 The end of the screw rod 71 away from the transmission column 63 is coaxially sleeved with a mounting ring 11, the mounting ring 11 is coaxially sleeved with a second bearing 12, and the first bearing 8 and the second bearing 12 are both arranged on the inner sidewall of the reduction gearbox 2.

[0040] Referring to Figure 2 and Figure 4The locking member 76 is arranged between the positioning ring seat 74 and the reduction box 2 for fixation, and the locking member 76 comprises a locking screw 761 which is screwed between the inner and outer sidewalls of the reduction box 2 and used for abutting against the sidewall of the positioning ring seat 74. The second C-shaped blocking ring 762 is arranged between the positioning ring seat 74 close to the transmission column 63 and the first bearing 8, and the second C-shaped blocking ring 762 is used for abutting against the positioning ring seat 74.

[0041] With reference to Figure 4 The second clamping groove 763 for placing the second C-shaped blocking ring 762 is formed in the inner sidewall of the reduction box 2, the positioning ring seat 74 far from the transmission column 63 abuts against the outer ring of the second bearing 12, and the shaft cover plate 764 is bolted on the reduction box 2 and located at the end of the screw rod 71 away from the transmission column 63, and the shaft cover plate 764 is used for pressing the second bearing 12 on the positioning ring seat 74 far from the transmission column 63.

[0042] With reference to Figure 4 The screw rod 71 is coaxially provided with two light shafts 18, one of which is located between the screw rod 71 and the transmission column 63, and the other is coaxially arranged in the mounting ring 11, and the transmission column 63, the light shaft 18 and the screw rod 71 are integrally arranged, the oil seal rubber ring 19 is clamped on the positioning ring seat 74 and is sleeved on the light shaft 18, and the oil seal rubber ring 19 can be made of the silicon rubber material in the prior art.

[0043] With reference to Figure 2 and Figure 4 The pressure sensor 77 is located between the two oil seal rubber rings 19, the oil sealing rubber ring 20 is sleeved on the output shaft of the motor 1, the sealing rubber ring 14 abuts against the inner sidewall of the reduction box 2, and the sealing rubber ring 21 is arranged between the positioning ring seat 74 and the end of the worm 5, and the oil sealing rubber ring 20 and the sealing rubber ring 21 can be made of the silicon rubber material in the prior art.

[0044] When the worker needs to rotate and lower the plank, at this time, the rotation of the plank will not be hindered by the ground, so the rotation of the torque shaft 3 will not be hindered, and since the cross sections of the sliding block 72 and the through slot 73 are both polygonal, in the process that the transmission column 63 drives the screw rod 71 to rotate synchronously, the screw rod 71 will drive the worm 5 to rotate synchronously through the sliding block 72, until the plank hits the ground.

[0045] At this time, since the ground hinders the rotation of the plank, the plank will hinder the rotation of the worm gear 4 through the torque shaft 3, and the worm gear 4 will hinder the rotation of the worm 5, so at this time, the worm 5 is equivalent to be fixed, and at this time, the torque output by the motor 1 will continue to drive the screw rod 71 to rotate through the transmission column 63, and the rotating screw rod 71 will drive the sliding block 72 to slide along the axis direction of the screw rod 71.

[0046] Until the slider 72 hits the sensing end of the pressure sensor 77, the pressure sensor 77 is triggered and feeds back a signal to the control system, the control system controls the motor 1 to stop working and changes the direction of the output shaft of the motor 1, because the stop of the rotating of the platform is completely determined by the terrain that hinders the rotation of the platform, so that the platform can adapt to the requirements of different terrains, and the motor 1 will not enter the process of overload operation.

[0047] The implementation principle of the friction torque self-locking speed reducer motor in the embodiment of the application is as follows: the worker starts the motor 1 through the control system, the output shaft of the motor 1 drives the first helical gear 64 to rotate synchronously, the first helical gear 64 drives the output column 61 to rotate through the second helical gear 65, and the output column 61 drives the primary transmission gear 66 to rotate synchronously.

[0048] The primary transmission gear 66 drives the intermediate column 62 to rotate through the secondary transmission gear 67, the intermediate column 62 drives the tertiary transmission gear 68 to rotate synchronously, the tertiary transmission gear 68 drives the transmission column 63 to rotate through the quaternary transmission gear 69, the transmission column 63 drives the worm 5 to rotate, the worm 5 drives the torque shaft 3 to rotate through the worm wheel 4, and the torque shaft 3 drives the platform to rotate.

[0049] Because the noise generated by the helical gear in the transmission process is small, the first helical gear 64 and the second helical gear 65 realize the noise reduction effect of the motor 1 in the transmission process, and under the transmission torque of the multi-stage transmission gear, the self-locking force between the worm wheel 4 and the worm 5 is amplified, so that the platform will not easily rotate in the reverse direction.

[0050] When the worker needs to rotate and lower the platform, the rotation of the platform at this time will not be hindered by the ground, so the rotation of the torque shaft 3 will not be hindered, because the cross section of the slider 72 and the through slot 73 is polygonal, so in the process of the transmission column 63 driving the screw rod 71 to rotate synchronously, the screw rod 71 will drive the worm 5 to rotate synchronously through the slider 72, until the platform hits the ground.

[0051] At this time, because the ground hinders the rotation of the platform, the platform will hinder the rotation of the worm wheel 4 through the torque shaft 3, and the worm wheel 4 will hinder the rotation of the worm 5, so at this time the worm 5 is equivalent to being fixed, and at this time the torque output by the motor 1 will continue to drive the screw rod 71 to rotate through the transmission column 63, and the rotating screw rod 71 will drive the slider 72 to slide along the axis direction of the screw rod 71.

[0052] Until the slider 72 hits the sensing end of the pressure sensor 77, the pressure sensor 77 is triggered and feeds back a signal to the control system, the control system controls the motor 1 to stop working and changes the direction of the output shaft of the motor 1, because the stop of the rotating of the platform is completely determined by the terrain that hinders the rotation of the platform, so that the platform can adapt to the requirements of different terrains, and the motor 1 will not enter the process of overload operation.

[0053] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, and thus: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A friction torque self-locking geared motor, comprising a motor (1) and a gearbox (2), wherein the motor (1) is detachably mounted on the gearbox (2), characterized in that: A torque shaft (3) is rotatably mounted on the gearbox (2), and a mounting plate is installed on the torque shaft (3). A worm gear (4) is coaxially mounted on the torque shaft (3). A worm (5) that meshes with the worm gear (4) is rotatably mounted on the gearbox (2). A gear set (6) for speed reduction is provided between the worm (5) and the output shaft of the motor (1). A load protection component (7) is provided inside the gearbox (2). When the torque shaft (3) stops rotating, the load protection component (7) controls the motor (1) to stop rotating. The gear set (6) includes an output post (61), an intermediate post (62), and a transmission post (63); The load protection component (7) includes a screw (71) coaxially mounted on the transmission column (63), a slider (72) threadedly connected to the screw (71), and through slots (73) for sliding of the slider (72) at both ends of the worm (5) along its axial direction. The slider (72) and the through slots (73) are both polygonal in cross-section. Both ends of the worm (5) are rotatably fitted with positioning ring seats (74). The positioning ring seats (74) are provided with stepped slots (75) for the end of the worm (5) to be inserted. A locking element (76) for fixing is provided between the positioning ring seats (74) and the gearbox (2). Pressure sensors (77) electrically connected to the control system are provided on the positioning ring seats (74) at both ends of the worm (5). The slider (72) is located between the sensing ends of the two pressure sensors (77).

2. The friction torque self-locking geared motor according to claim 1, characterized in that: A first helical gear (64) is coaxially arranged on the output shaft of the motor (1). A second helical gear (65) meshing with the first helical gear (64) is coaxially arranged on the output column (61). A first-stage transmission gear (66) is coaxially arranged on the output column (61). A second-stage transmission gear (67) meshing with the first-stage transmission gear (66) is coaxially arranged on the intermediate column (62). A third-stage transmission gear (68) is coaxially arranged on the intermediate column (62). A fourth-stage transmission gear (69) meshing with the third-stage transmission gear (68) is coaxially arranged on the transmission column (63). The transmission column (63) is coaxially arranged on the worm gear (5).

3. The friction torque self-locking geared motor according to claim 2, characterized in that: A first bearing (8) is coaxially sleeved on the transmission column (63). A first C-shaped retaining ring (9) is provided between the first bearing (8) and the fourth-stage transmission gear (69). The first C-shaped retaining ring (9) is used to abut against the outer ring of the first bearing (8). A first slot (10) for placing the first C-shaped retaining ring (9) is provided on the inner side wall of the gearbox (2). An installation ring (11) is coaxially sleeved on one end of the screw (71) facing away from the transmission column (63). A second bearing (12) is coaxially sleeved on the installation ring (11). The first bearing (8) and the second bearing (12) are both located on the inner side wall of the gearbox (2).

4. A friction torque self-locking geared motor according to claim 3, characterized in that: The locking member (76) includes a locking screw (761) threaded between the inner and outer walls of the gearbox (2). The locking screw (761) abuts against the side wall of the positioning ring seat (74). A second C-shaped retaining ring (762) is provided between the positioning ring seat (74) near the transmission column (63) and the first bearing (8). The second C-shaped retaining ring (762) abuts against the positioning ring seat (74). An opening is provided on the inner wall of the gearbox (2). There is a second slot (763) for placing the second C-shaped retaining ring (762). The positioning ring seat (74) away from the transmission column (63) abuts against the outer ring of the second bearing (12). The gearbox (2) is detachably provided with a shaft cover plate (764). The shaft cover plate (764) is located at one end of the screw (71) facing away from the transmission column (63). The shaft cover plate (764) is used to press the second bearing (12) onto the positioning ring seat (74).

5. A friction torque self-locking geared motor according to claim 3, characterized in that: The pressure sensor (77) is located inside the ring of the positioning ring seat (74). A wiring hole (13) for the wire (15) to pass through is opened between the inner and outer walls of the positioning ring seat (74). A sealing ring (14) is provided at the wiring hole (13) of the positioning ring seat (74), and the sealing ring (14) is sleeved on the wire (15) connecting the pressure sensor (77). A through hole (16) for the wire (15) to pass through is opened between the inner and outer walls of the gearbox (2). A leak-proof ring (17) is provided at the through hole (16) of the gearbox (2), and the leak-proof ring (17) is sleeved on the wire (15) connecting the pressure sensor (77). The screw... (71) has two optical shafts (18) coaxially arranged at both ends. One of the optical shafts (18) is located between the screw (71) and the transmission column (63). The other optical shaft (18) is coaxially passed through the mounting ring (11). An oil seal ring (19) is provided on the positioning ring seat (74). The oil seal ring (19) is sleeved on the optical shaft (18). The pressure sensor (77) is located between the two oil seal rings (19). An oil seal ring (20) is sleeved on the output shaft of the motor (1). The sealing ring (14) abuts against the inner wall of the gearbox (2). A sealing ring (21) is provided between the positioning ring seat (74) and the end of the worm (5).

6. A friction torque self-locking geared motor according to claim 1, characterized in that: A copper ring (22) is provided on the stepped groove (75) of the positioning ring seat (74), and the copper ring (22) is used to abut against the end of the worm (5).

7. A friction torque self-locking geared motor according to claim 5, characterized in that: The transmission column (63), the optical axis (18), and the screw (71) are integrally formed and arranged.

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