Passenger boarding ladder motor and speed reducing and torque increasing device

Abstract

The invention relates to the electromechanical field, and discloses a passenger boarding ladder motor and a speed-reducing torque-increasing device, and the motor comprises a rotor shaft which is located at the center of a rotor assembly and is used for transmitting the power of the rotor assembly; the output shaft is positioned on the motor shell and is used for outputting power of the motor; the planetary gear carrier is positioned between the rotor shaft and the output shaft and is used for connecting the rotor shaft and the output shaft; the planetary gear set is located in the rotor assembly and used for transmitting power of the rotor shaft to the planetary gear carrier. The planetary gear set is installed in the motor, the output torque of the motor is increased, meanwhile, the size of the motor is reduced, the device better meets the strict requirements of modern airport equipment for compactness and high efficiency, the rotor shaft is connected with the output shaft through the arrangement of the planetary gear carrier, the operation stability and structural strength of the rotor assembly are guaranteed, and the service life of the rotor assembly is prolonged. The service life of the device is prolonged.

Description

Technical Field

[0001] The invention relates to the field of electromechanics, and in particular to a passenger boarding ladder motor and a speed reduction and torque increasing device. Background Art

[0002] Currently, the drive system of passenger boarding stairs usually relies on traditional motors and gear transmissions. However, although the motor plus gear transmission can increase the output torque, it is large in size and cannot meet the strict requirements of modern airport equipment for compactness and efficiency. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is that the combined volume of the motor and the gear transmission device is relatively large.

[0004] The above technical problem is solved by the following technical solution: The present invention proposes a deceleration and torque increasing device, which comprises:

[0005] A rotor shaft, located at the center of the rotor assembly and used to transmit power of the rotor assembly;

[0006] An output shaft, located on the motor housing and used for outputting power from the motor;

[0007] a planetary gear carrier, located between the rotor shaft and the output shaft, and used to connect the rotor shaft and the output shaft;

[0008] A planetary gear set is located inside the rotor assembly and is used to transmit the power of the rotor shaft to the planetary gear carrier.

[0009] In a preferred embodiment of the speed reduction and torque increase device of the present invention: the planetary gear set includes a sun gear, planetary gears and a ring gear, the sun gear sleeve is fixed on one end of the rotor shaft, one end of the rotor shaft is rotatably connected to the center of one side of the planetary gear frame, the other end of the rotor shaft is rotatably connected to the motor housing through a bearing, the center of the other side of the planetary gear frame is fixedly connected to the output shaft, and the output shaft is rotatably connected to the motor housing through a bearing.

[0010] In a preferred embodiment of the speed reduction and torque increase device of the present invention: the planetary gears are rotatably connected to the planetary gear carrier via bearings, at least three planetary gears are provided and arranged on the periphery of the sun gear, and the planetary gears are meshed with the sun gear.

[0011] In a preferred embodiment of the speed reduction and torque increase device of the present invention: the ring gear is fixedly connected to the motor housing through an extension column, and the ring gear is meshed with the planetary gear.

[0012] In a preferred embodiment of the speed reduction and torque increase device of the present invention: a groove is provided at the end of the rotor assembly, the diameter of the groove is slightly larger than the outer diameter of the ring gear, the root circle diameter of the sun gear is the same as the diameter of the rotor shaft, and the top circle diameter of the planetary gear is equal to the difference between the inner radius of the root circle of the ring gear and the root circle radius of the sun gear.

[0013] The present invention provides a deceleration and torque-increasing device, which comprises:

[0014] A rotor shaft, located at the center of the rotor assembly and used to transmit power of the rotor assembly;

[0015] An output shaft, located on the motor housing and used for outputting power from the motor;

[0016] a planetary gear carrier, located between the rotor shaft and the output shaft, and used to connect the rotor shaft and the output shaft;

[0017] a planetary gear set, located outside the rotor assembly, for transmitting power from the rotor shaft to the planetary gear carrier;

[0018] The stator is located on the motor housing and is used to provide a magnetic field for the rotor assembly.

[0019] In a preferred embodiment of the speed reduction and torque increase device of the present invention: the planetary gear set includes a sun gear, planetary gears and a ring gear, the sun gear sleeve is fixed on one end of the rotor shaft, one end of the rotor shaft is rotatably connected to the center of one side of the planetary gear frame, the other end of the rotor shaft is rotatably connected to the motor housing through a bearing, the center of the other side of the planetary gear frame is fixedly connected to the output shaft, and the output shaft is rotatably connected to the motor housing through a bearing.

[0020] In a preferred embodiment of the speed reduction and torque increase device of the present invention: the planetary gears are rotatably connected to the planetary gear carrier via bearings, at least three planetary gears are provided and arranged on the periphery of the sun gear, and the planetary gears are meshed with the sun gear.

[0021] In a preferred embodiment of the speed reduction and torque increase device of the present invention: the ring gear is fixedly connected to the stator, the ring gear is meshed with the planetary gears, and the outer diameter of the ring gear is equal to the inner diameter of the stator.

[0022] In a preferred embodiment of the speed reduction and torque increase device of the present invention: the diameter of the sun gear is slightly larger than the diameter of the rotor shaft, and the diameter of the planetary gear is equal to the difference between the inner diameter of the gear ring and the outer diameter of the sun gear.

[0023] The present invention provides a passenger boarding ladder motor, comprising a deceleration and torque increasing device, and further comprising:

[0024] A motor housing, a stator arranged in the motor housing, a rotor shaft arranged in the motor housing, and a rotor assembly arranged on the rotor shaft.

[0025] In a preferred embodiment of the passenger boarding ladder motor of the present invention: the rotor assembly includes a rotor frame arranged on the rotor shaft, a rotor winding arranged on the rotor frame, and an output shaft arranged on the motor housing, and the output shaft is connected to the rotor shaft through a speed reduction and torque increase device.

[0026] The beneficial effects of the present invention are: by installing the planetary gear set inside the motor, the output torque of the motor is increased, while the volume of the motor is reduced, so that the device can better meet the strict requirements of modern airport equipment on compactness and efficiency;

[0027] By setting the planetary gear carrier, the rotor shaft is connected to the output shaft, which ensures the stability of the rotor assembly and the structural strength, and increases the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention are briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention. Among them:

[0029] Figure 1 A schematic diagram of the connection structure of the deceleration and torque-increasing device is shown;

[0030] Figure 2 A schematic diagram showing the connection between the planetary gear carrier, the rotor shaft and the output shaft is shown;

[0031] Figure 3 An exploded view of a planetary gear set is shown;

[0032] Figure 4 An exploded view of a passenger boarding ladder motor is shown;

[0033] Figure 5 The installation diagram of the ring gear and the planetary gear set is shown.

[0034] Figure 6 A schematic diagram of the dimensions of the groove is shown.

[0035] Figure 7 A schematic diagram of the dimensions of the planetary gear is shown.

[0036] Figure 8 A schematic diagram of the structure after the rotor assembly is installed is shown.

[0037] Fig. 9 Another structural schematic diagram after the rotor assembly is installed is shown.

[0038] Fig.10 Another installation schematic diagram of the ring gear and the planetary gear set is shown.

[0039] Fig.11 The overall structural schematic diagram of the passenger boarding ladder motor is shown. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with specific implementation methods and drawings.

[0041] The terms used in the present invention are those general terms currently widely used in the art in consideration of the functions of the present invention, but these terms may vary according to the intention of a person of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as a general description based on the meaning of the terms and the present invention.

[0042] Reference Figure 1 , Figure 2 and Figure 4 This embodiment provides a speed reduction and torque increase device 100, including a rotor shaft 101, an output shaft 103, a planetary gear carrier 105 and a planetary gear set 106.

[0043] The rotor shaft 101 is located at the center of the rotor assembly 102 and is used to transmit the power of the rotor assembly 102. The output shaft 103 is located on the motor housing 104 and is used to output the power of the motor. The planetary gear carrier 105 is located between the rotor shaft 101 and the output shaft 103 and is used to connect the rotor shaft 101 and the output shaft 103. The planetary gear set 106 is located inside the rotor assembly 102 and is used to transmit the power of the rotor shaft 101 to the planetary gear carrier 105.

[0044] The rotor shaft 101 is connected to the output shaft 103 via the planetary gear set 106, which not only improves the output torque of the motor, but also sets the planetary gear set 106 inside the rotor assembly 102 to increase the volume of the rotor assembly 102, thereby further increasing the output torque of the motor.

[0045] In a brushless DC motor, the relationship between the stator and the rotor is based on electromagnetic induction. When current is passed through the rotor, a magnetic field is generated. When the rotor winding is energized, the generated magnetic field interacts with the magnetic field of the stator to generate electromagnetic force, thereby driving the rotor to rotate.

[0046] During use, current is passed through the rotor assembly 102, and the rotor assembly 102 interacts with the stator in the motor, thereby driving the rotor assembly 102 to rotate. The rotor assembly 102 drives the rotor shaft 101 to rotate the planetary gear set 106, and the planetary gear set 106 drives the planetary gear carrier 105 to rotate the output shaft 103. A connecting groove is provided at one end of the output shaft 103 for connecting to the output shaft of the transmission mechanism of the passenger boarding ladder to achieve power output.

[0047] Reference Figure 3 and Figure 4 The planetary gear set 106 includes a sun gear 106a, a planetary gear 106b and a ring gear 106c. The sun gear 106a is sleeved and fixed on one end of the rotor shaft 101. One end of the rotor shaft 101 is rotatably connected to the center of one side of the planetary gear carrier 105. The other end of the rotor shaft 101 is rotatably connected to the motor housing 104 through a bearing. The center of the other side of the planetary gear carrier 105 is fixedly connected to the output shaft 103. The output shaft 103 is rotatably connected to the motor housing 104 through a bearing.

[0048] The motor housing 104 includes a stator housing 104a, a front cover 104b and a rear cover 104c, and the front cover 104b and the rear cover 104c are fixed to the stator housing 104a by bolts.

[0049] The sun gear 106a is sleeved and fixed on the end of the rotor shaft 101, so that the rotation of the rotor shaft 101 can drive the sun gear 106a to rotate. The sun gear 106a can also be a plurality of external teeth formed by extending axially on the outer peripheral surface of the end of the rotor shaft 101. This integrated design reduces the installation steps of the sun gear 106a and increases the structural strength of the sun gear 106a.

[0050] Among them, one end of the rotor shaft 101 is rotatably connected to the center of one side of the planetary gear carrier 105, and the other end of the rotor shaft 101 is rotatably connected to the motor housing 104 through a bearing, so that the rotor shaft 101 and the output shaft 103 form a whole. If the planetary gear carrier 105 is not connected to the end of the rotor shaft 101, the rotor shaft 101 will have poor stability. Since only one end is supported, the rotor shaft is prone to vibration when rotating at high speed, and the bearing capacity is limited. The single support method has a weak bearing capacity for axial and radial loads, which may cause premature wear of the bearing. And it is not suitable for heavy-load application scenarios such as passenger boarding ladders. One end of the rotor shaft 101 is connected to the motor housing 104 through a bearing, and the other end of the rotor shaft 101 is rotatably connected to the planetary gear carrier 105, which improves the stability of one end of the rotor shaft 101 and reduces vibration. Since both ends of the rotor shaft 101 are supported, the vibration of the rotor shaft 101 during high-speed rotation can be reduced, and the running stability of the motor can be improved. In addition, the double support design can better withstand radial and axial loads, reduce bearing wear, and extend the life of the motor. Moreover, the bearings at both ends can evenly share the radial and axial loads, improving the load-bearing capacity of the motor, making it more suitable for high-torque application scenarios.

[0051] Among them, one end of the output shaft 103 is fixedly connected to the center of the planetary gear frame 105, and the other end of the output shaft 103 is rotatably connected to the center of the front cover of the motor housing 104 through a bearing, so that the output shaft 103 also has two support points, which increases the stability of the output shaft 103 when it rotates, and at the same time ensures that the planetary gear frame 105 rotates to drive the output shaft 103 to output.

[0052] Reference Figure 3 The planetary gears 106b are rotatably connected to the planetary gear carrier 105 via bearings. There are at least three planetary gears 106b disposed on the periphery of the sun gear 106a. The planetary gears 106b are meshed with the sun gear 106a.

[0053] Among them, there can be multiple planetary gears 106b, and the multiple planetary gears 106b are evenly distributed on the outer periphery of the sun gear 106a, which can evenly distribute the load to each planetary gear 106b. This uniform distribution reduces the load of a single gear, thereby reducing the stress and wear of the gear and increasing the service life of the device.

[0054] Reference Figure 3 The ring gear 106c is fixedly connected to the motor housing 104 through an extension column 106d, and the ring gear 106c is meshed with the planetary gear 106b.

[0055] Among them, a plurality of extension columns 106d are fixedly connected to the inner side of the front cover of the motor housing 104, and the ring gear 106c can be fixed on the same plane as the planetary gear 106b through the extension columns 106d, so as to ensure the meshing of the ring gear 106c and the planetary gear 106b. One end of the extension column 106d is fixed to the end face of the ring gear 106c, and the other end is fixed to the inner side of the front cover of the motor housing 104, and a plurality of extension columns 106d are arranged in an annular array along the end face of the ring gear 106c to increase the stability of the ring gear 106c.

[0056] Reference Figures 5 to 8 A groove 107 is formed at the end of the rotor assembly 102, and the diameter of the groove 107 is slightly larger than the outer diameter of the ring gear 106c. The root circle diameter of the sun gear 106a is the same as the diameter of the rotor shaft 101. The top circle diameter of the planetary gear 106b is equal to the difference between the inner radius of the root circle of the ring gear 106c and the root circle radius of the sun gear 106a.

[0057] The rotor assembly 102 includes a rotor frame 102a and a rotor winding 102b. The radius of the rotor frame 102a is slightly smaller than the inner diameter of the stator (ie, Figure 6 Medium R 1 The rotor winding 102b is wound on the rotor frame 102a, and the winding thickness is R 2 (like Figure 6 The maximum radius of the groove 107 is the difference between the radius of the rotor frame 102a and the thickness of the rotor winding 102b (ie, Figure 6 Medium R 3 size shown).

[0058] Among them, the size of the planetary gear set 106 has a significant impact on the torque output. The setting of the planetary gear set 106 can significantly increase the output torque without increasing the size of the motor. The planetary gear set 106 consists of a sun gear 106a, a planetary gear 106b and a ring gear 106c. The sun gear 106a is located at the center of the gear and is connected to the rotor shaft 101 of the motor. The planetary gear 106b surrounds the sun gear 106a with multiple gears, which are meshed with the sun gear 106a and the ring gear 106c. The ring gear 106c surrounds the outer ring gear of the planetary gear 106b and is fixed.

[0059] The torque output of the planetary gear set (106) can be calculated by the following formula: 输出 =T 输入 ×(1+S / R) where: T 输出 : Output torque. T 输入 : Input torque (torque of the motor). R: Radius of the planetary gear 106b. S: Radius of the sun gear 106a. The larger the radius R of the planetary gear 106b, the greater the output torque T. 输出This is because the increase in the radius of the planetary gear 106b can provide a greater leverage effect, thereby amplifying the input torque. The smaller the radius S of the sun gear 106a, the greater the output torque T 输出 The larger the radius of the sun gear 106a, the greater the reduction ratio can be, thereby amplifying the input torque. The maximum radius of the groove 107 is the difference between the radius of the rotor frame 102a and the thickness of the rotor winding 102b (i.e., Figure 6 Medium R 3 The size shown), therefore the maximum radius of the gear ring 106c can be the same as that of the groove 107 (ie, Figure 6 Medium R 3 By maximizing the design of the ring gear 106c, the designable radius of the planetary gear 106b is increased, thereby increasing the output torque of the device without increasing the size of the motor.

[0060] The root diameter of the sun gear 106a is the same as the diameter of the rotor shaft 101, so the root radius S of the sun gear 106a is the minimum value (ie, Figure 7 Medium R 4 The size shown in the figure) is the same as the radius of the rotor shaft 101, so that the sun gear 106a can provide a larger reduction ratio. Since the maximum radius of the ring gear 106c can be the same as that of the groove 107, Figure 6 Medium R 3 The size shown, the minimum value of the root circle radius S of the sun gear 106a (ie, Figure 7 Medium R 4 The size shown) is the same as the radius of the rotor shaft 101, so the maximum value of the addendum diameter of the planetary gear 106b (ie, Figure 7 Medium R 6 The size shown) is equal to the inner radius of the root circle of the gear ring 106c (ie, Figure 7 Medium R 5 The size shown) and the root circle radius of the sun gear 106a (ie, Figure 7 Medium R 4 The maximized design of the planetary gear 106b provides a greater leverage effect, thereby increasing the output torque of the device. By maximizing the ring gear 106c and the ring gear 106c and minimizing the sun gear 106a, the output torque of the device can be increased without increasing the size of the motor.

[0061] The size of the planetary gear set 106 has a significant effect on the torque output. High torque output is achieved by optimizing the size of the planetary gear 106b and the sun gear 106a. This design significantly increases the output torque without increasing the size of the motor, allowing the device to better meet the stringent requirements of modern airport equipment for compactness and efficiency.

[0062] Among them, the planetary gear 106b and the sun gear 106a are made of nitrided steel, which is a steel material that has been nitrided and has high hardness and wear resistance, so as to improve the reliability and life of the planetary gear set 106. The rotor shaft 101 and the output shaft 103 are made of medium alloy steel, which is a steel material containing a certain amount of alloy elements and has good strength and toughness. By using high-strength alloy materials for key components and nitriding treatment, the surface hardness and wear resistance of the components are significantly improved, the service life of the device is extended, and the maintenance cost is reduced.

[0063] Below, based on Figure 8 to Figure 10 Different embodiments of the speed reduction and torque increase device 100 are described.

[0064] A speed reducing and torque increasing device 100 includes a rotor shaft 101, an output shaft 103, a planetary gear carrier 105, a planetary gear set 106 and a stator 108.

[0065] The rotor shaft 101 is located at the center of the rotor assembly 102 and is used to transmit the power of the rotor assembly 102. The output shaft 103 is located on the motor housing 104 and is used to output the power of the motor. The planetary gear carrier 105 is located between the rotor shaft 101 and the output shaft 103 and is used to connect the rotor shaft 101 and the output shaft 103. The planetary gear set 106 is located outside the rotor assembly 102 and is used to transmit the power of the rotor shaft 101 to the planetary gear carrier 105. The stator 108 is located on the motor housing 104 and is used to provide a magnetic field for the rotor assembly 102.

[0066] The rotor shaft 101 is connected to the output shaft 103 via the planetary gear set 106, which not only improves the output torque of the motor, but also sets the planetary gear set 106 inside the rotor assembly 102 to increase the volume of the rotor assembly 102, thereby further increasing the output torque of the motor.

[0067] In a brushless DC motor, the relationship between the stator and the rotor is based on electromagnetic induction. When current is passed through the rotor, a magnetic field is generated. When the rotor winding is energized, the generated magnetic field interacts with the magnetic field of the stator to generate electromagnetic force, thereby driving the rotor to rotate.

[0068] During use, current is passed through the rotor assembly 102, and the rotor assembly 102 interacts with the stator in the motor, thereby driving the rotor assembly 102 to rotate. The rotor assembly 102 drives the rotor shaft 101 to rotate the planetary gear set 106, and the planetary gear set 106 drives the planetary gear carrier 105 to rotate the output shaft 103. A connecting groove is provided at one end of the output shaft 103 for connecting to the output shaft of the transmission mechanism of the passenger boarding ladder to achieve power output.

[0069] Reference Fig. 9 and Fig.10 The planetary gear set 106 includes a sun gear 106a, a planetary gear 106b and a ring gear 106c. The sun gear 106a is sleeved and fixed on one end of the rotor shaft 101. One end of the rotor shaft 101 is rotatably connected to the center of one side of the planetary gear carrier 105. The other end of the rotor shaft 101 is rotatably connected to the motor housing 104 through a bearing. The center of the other side of the planetary gear carrier 105 is fixedly connected to the output shaft 103. The output shaft 103 is rotatably connected to the motor housing 104 through a bearing.

[0070] Among them, refer to Figure 4 The motor housing 104 includes a stator housing 104a, a front cover 104b and a rear cover 104c, and the front cover and the rear cover are fixed to the stator housing 104a by bolts.

[0071] The sun gear 106a is sleeved and fixed on the end of the rotor shaft 101, so that the rotation of the rotor shaft 101 can drive the sun gear 106a to rotate. The sun gear 106a can also be a plurality of external teeth formed by extending axially on the outer peripheral surface of the end of the rotor shaft 101. This integrated design reduces the installation steps of the sun gear 106a and increases the structural strength of the sun gear 106a.

[0072] Among them, refer to Figure 2 , one end of the rotor shaft 101 is rotatably connected to the center of one side of the planetary gear carrier 105, and the other end of the rotor shaft 101 is rotatably connected to the motor housing 104 through a bearing, so that the rotor shaft 101 and the output shaft 103 form a whole. If the planetary gear carrier 105 is not connected to the end of the rotor shaft 101, the rotor shaft 101 will have poor stability. Since only one end is supported, the rotor shaft is prone to vibration when rotating at high speed, and the bearing capacity is limited. The single support method has a weak bearing capacity for axial and radial loads, which may cause premature wear of the bearing. And it is not suitable for heavy-load application scenarios such as passenger boarding ladders. One end of the rotor shaft 101 is connected to the motor housing 104 through a bearing, and the other end of the rotor shaft 101 is rotatably connected to the planetary gear carrier 105, which improves the stability of one end of the rotor shaft 101 and reduces vibration. Since both ends of the rotor shaft 101 are supported, the vibration of the rotor shaft 101 during high-speed rotation can be reduced, and the running stability of the motor can be improved. Moreover, the double support design can better withstand radial and axial loads, reduce bearing wear, and extend the life of the motor. Moreover, the bearings at both ends can evenly share the radial and axial loads, improving the load-bearing capacity of the motor, making it more suitable for high-torque application scenarios.

[0073] Among them, refer to Figure 3One end of the output shaft 103 is fixedly connected to the center of the planetary gear carrier 105, and the other end of the output shaft 103 is rotatably connected to the center of the front cover of the motor housing 104 through a bearing, so that the output shaft 103 also has two support points, which increases the stability of the output shaft 103 when rotating, and at the same time ensures that the planetary gear carrier 105 rotates to drive the output shaft 103 to output.

[0074] Reference Fig. 9 and Fig.10 The planetary gears 106b are rotatably connected to the planetary gear carrier 105 via bearings. There are at least three planetary gears 106b disposed on the periphery of the sun gear 106a. The planetary gears 106b are meshed with the sun gear 106a.

[0075] Among them, there can be multiple planetary gears 106b, and the multiple planetary gears 106b are evenly distributed on the outer periphery of the sun gear 106a, which can evenly distribute the load to each planetary gear 106b. This uniform distribution reduces the load of a single gear, thereby reducing the stress and wear of the gear and increasing the service life of the device.

[0076] Reference Fig.10 The ring gear 106 c is fixedly connected to the stator 108 , the ring gear 106 c is meshed with the planetary gear 106 b , and the outer diameter of the ring gear 106 c is equal to the inner diameter of the stator 108 .

[0077] The outer surface of the ring gear 106c is fixedly connected to the inner surface of the stator 108, thereby maximizing the diameter of the ring gear 106c, thereby increasing the designable radius of the planetary gear 106b, and further increasing the output torque of the device without increasing the size of the motor. There is a certain gap between the ring gear 106c and the rotor assembly 102 to ensure the normal rotation of the rotor assembly 102 (such as Fig. 9 shown).

[0078] Reference Fig.10 The root circle diameter of the sun gear 106a is the same as the diameter of the rotor shaft 101, and the addendum circle diameter of the planetary gear 106b is equal to the difference between the inner radius of the root circle of the ring gear 106c and the root circle radius of the sun gear 106a.

[0079] The rotor assembly 102 includes a rotor frame 102 a and a rotor winding 102 b , and the radius of the rotor frame 102 a is slightly smaller than the inner diameter of the stator 108 .

[0080] Among them, the size of the planetary gear set 106 has a significant impact on the torque output. The setting of the planetary gear set 106 can significantly increase the output torque without increasing the size of the motor. The planetary gear set 106 consists of a sun gear 106a, a planetary gear 106b and a ring gear 106c. The sun gear 106a is located at the center of the gear and is connected to the rotor shaft 101 of the motor. The planetary gear 106b surrounds the sun gear 106a with multiple gears, which are meshed with the sun gear 106a and the ring gear 106c. The ring gear 106c surrounds the outer ring gear of the planetary gear 106b and is fixed.

[0081] The torque output of the planetary gear set 106 can be calculated by the following formula: 输出 =T 输入 ×(1+S / R) where: T 输出 : Output torque. T 输入 : Input torque (torque of the motor). R: Radius of the planetary gear 106b. S: Radius of the sun gear 106a. The larger the radius R of the planetary gear 106b, the greater the output torque T. 输出 This is because the increase in the radius of the planetary gear 106b can provide a greater leverage effect, thereby amplifying the input torque. The smaller the radius S of the sun gear 106a, the greater the output torque T 输出 This is because the radius of the sun gear 106a is reduced, which can provide a larger reduction ratio, thereby amplifying the input torque.

[0082] Reference Fig.10 , the outer diameter of the ring gear 106c is the same as the inner diameter of the stator 108, the minimum value of the root circle radius S of the sun gear 106a is the same as the radius of the rotor shaft 101, and the maximum value of the tip circle radius R of the planetary gear 106b is equal to the difference between the inner radius of the root circle of the ring gear 106c and the root circle radius of the sun gear 106a. Therefore, by maximizing the setting of the ring gear 106c and minimizing the setting of the sun gear 106a, the planetary gear 106b is maximized. According to T 输出 =T 输入 ×(1+S / R), which maximizes the motor’s output torque without increasing the motor’s size.

[0083] Reference Figure 4 and Fig.11 A passenger boarding ladder motor includes a speed reduction and torque increase device 100, a motor housing 104, a stator 108 arranged in the motor housing 104, a rotor shaft 101 arranged in the motor housing 104, and a rotor assembly 102 arranged on the rotor shaft 101.

[0084] The rotor assembly 102 includes a rotor frame 102 a disposed on the rotor shaft 101 , a rotor winding 102 b disposed on the rotor frame 102 a , and an output shaft 103 disposed on the motor housing 104 . The output shaft 103 is connected to the rotor shaft 101 via a speed reduction and torque increase device 100 .

[0085] The stator 108 is an arc-shaped permanent magnet, and a plurality of them are provided in an annular array on the stator housing 104a. One end of the rotor shaft 101 is rotatably connected to the rear cover 104c through a bearing. A rotor hole is provided at the center of the rotor frame 102a for installing the rotor shaft 101. A T-shaped frame (such as Figure 5 As shown in the figure, a plurality of T-shaped frames are arranged in an annular array on the outer periphery of the rotor frame 102a, providing space for the winding of the rotor winding 102b. The distance from the center of the rotor frame 102a to the edge of the T-shaped frame is smaller than the radius of the stator 108, so that the rotor assembly 102 can rotate inside the stator 108.

[0086] Among them, refer to Figure 4 , a mounting plate 201a is fixedly connected to the rear cover 104c, and a plurality of brushes 201b are fixedly connected to the mounting plate 201a. The brushes 201b are components in the motor used to transfer the current from the external power supply to the rotor winding. Made of carbon, graphite or other conductive materials. A commutator 201c is arranged on the rotor shaft 101. The commutator 201c is located inside the rear cover 104c, opposite to the mounting end of the deceleration and torque increasing device 100. The brushes 201b are in contact with the commutator 201c, and the current is transferred to the rotor through sliding contact. The commutator 201c periodically changes the direction of the current when the rotor rotates, thereby changing the direction of the magnetic field in the rotor winding. This change in direction enables the rotor to rotate continuously.

[0087] Finally, it should be pointed out that the methods and devices described in detail above are only embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A speed reduction and torque increase device (100), characterized in that: include, A rotor shaft (101), located at the center of the rotor assembly (102) and used to transmit power of the rotor assembly (102); An output shaft (103), which is located on the motor housing (104) and is used for outputting power from the motor; a planetary gear carrier (105), located between the rotor shaft (101) and the output shaft (103), and used for connecting the rotor shaft (101) and the output shaft (103); A planetary gear set (106) is located inside the rotor assembly (102) and is used to transmit the power of the rotor shaft (101) to the planetary gear carrier (105).

2. The deceleration and torque increasing device (100) according to claim 1, characterized in that: The planetary gear set (106) comprises a sun gear (106a), a planetary gear (106b) and a ring gear (106c); the sun gear (106a) is sleeved and fixed on one end of the rotor shaft (101); one end of the rotor shaft (101) is rotatably connected to the center of one side of the planetary gear carrier (105); the other end of the rotor shaft (101) is rotatably connected to the motor housing (104) via a bearing; the center of the other side of the planetary gear carrier (105) is fixedly connected to the output shaft (103); and the output shaft (103) is rotatably connected to the motor housing (104) via a bearing.

3. The deceleration and torque increasing device (100) according to claim 2, characterized in that: The planetary gears (106b) are rotatably connected to the planetary gear carrier (105) via bearings. At least three planetary gears (106b) are provided and are arranged on the outer periphery of the sun gear (106a). The planetary gears (106b) are meshed with the sun gear (106a).

4. The deceleration and torque increasing device (100) according to claim 3, characterized in that: The ring gear (106c) is fixedly connected to the motor housing (104) via an extension column (106d), and the ring gear (106c) is meshed with the planetary gear (106b).

5. The deceleration and torque increasing device (100) according to any one of claims 2 to 4, characterized in that: A groove (107) is provided at the end of the rotor assembly (102), the diameter of the groove (107) is slightly larger than the outer diameter of the ring gear (106c), the root circle diameter of the sun gear (106a) is the same as the diameter of the rotor shaft (101), and the top circle diameter of the planetary gear (106b) is equal to the difference between the inner radius of the root circle of the ring gear (106c) and the root circle radius of the sun gear (106a).

6. A speed reduction and torque increase device (100), characterized in that: include, A rotor shaft (101), located at the center of the rotor assembly (102) and used to transmit power of the rotor assembly (102); An output shaft (103), which is located on the motor housing (104) and is used for outputting power from the motor; a planetary gear carrier (105), located between the rotor shaft (101) and the output shaft (103), and used for connecting the rotor shaft (101) and the output shaft (103); A planetary gear set (106), which is located outside the rotor assembly (102) and is used to transmit the power of the rotor shaft (101) to the planetary gear carrier (105); The stator (108) is located on the motor housing (104) and is used to provide a magnetic field for the rotor assembly (102).

7. The deceleration and torque increasing device (100) according to claim 6, characterized in that: The planetary gear set (106) comprises a sun gear (106a), a planetary gear (106b) and a ring gear (106c); the sun gear (106a) is sleeved and fixed on one end of the rotor shaft (101); one end of the rotor shaft (101) is rotatably connected to the center of one side of the planetary gear carrier (105); the other end of the rotor shaft (101) is rotatably connected to the motor housing (104) via a bearing; the center of the other side of the planetary gear carrier (105) is fixedly connected to the output shaft (103); and the output shaft (103) is rotatably connected to the motor housing (104) via a bearing.

8. The deceleration and torque increasing device (100) according to claim 7, characterized in that: The planetary gears (106b) are rotatably connected to the planetary gear carrier (105) via bearings. At least three planetary gears (106b) are provided and are arranged on the outer periphery of the sun gear (106a). The planetary gears (106b) are meshed with the sun gear (106a).

9. The deceleration and torque increasing device (100) according to claim 8, characterized in that: The ring gear (106c) is fixedly connected to the stator (108), the ring gear (106c) is meshed with the planetary gear (106b), and the outer diameter of the ring gear (106c) is equal to the inner diameter of the stator (108).

10. The speed reducing and torque increasing device (100) according to any one of claims 7 to 9, characterized in that: The diameter of the sun gear (106a) is slightly larger than the diameter of the rotor shaft (101), and the diameter of the planetary gear (106b) is equal to the difference between the inner diameter of the ring gear (106c) and the outer diameter of the sun gear (106a).

11. A passenger boarding ladder motor, characterized in that: The invention comprises a speed reducing and torque increasing device (100), and further comprises: A motor housing (104), a stator (108) disposed in the motor housing (104), a rotor shaft (101) disposed in the motor housing (104), and a rotor assembly (102) disposed on the rotor shaft (101).

12. The passenger boarding ladder motor according to claim 11, characterized in that: The rotor assembly (102) comprises a rotor frame (102a) arranged on the rotor shaft (101), a rotor winding (102b) arranged on the rotor frame (102a), and an output shaft (103) arranged on the motor housing (104); the output shaft (103) is connected to the rotor shaft (101) via a speed reduction and torque increase device (100).

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