CN210566055U - Lightweight high-strength electric drive speed reducer for automobile tail gate - Google Patents

Abstract

The utility model provides a lightweight high strength car tail-gate electricity drives reduction gear, including second grade planetary reducer (1), connector (2) and shaft coupling (3). The utility model discloses a two-stage planetary reducer comprises a reducer shell, a wheel core A and a wheel core B, wherein the reducer shell is provided with inner helical teeth, a mortise, a bayonet and a conical head buckle; the A wheel core is provided with an A core shell, an A shaft bracket, a wheel shaft, an A planet gear and an A revolution gear; the B wheel core is provided with a B core shell, a B shaft frame, a B planet gear and a B revolution gear; the connector is provided with a connecting key, a tenon and a hook; the coupling is provided with a tooth hole; the two-stage planetary reducer with the inner helical tooth structure, which is formed by connecting the wheel core A and the wheel core B made of all plastic materials in series and sharing the reducer shell, meets the technical indexes of the tail gate reducer and further meets the lightweight requirement, so that the production and application of the automobile tail gate electrically-driven reducer are realized, and the purposes of reducing the volume, lightening the weight, further lightening the weight, improving the efficiency and reducing the cost are achieved.

Description

Lightweight high-strength electric drive speed reducer for automobile tail gate

Technical Field

The utility model relates to an electronic tail-gate reduction gear of car specifically indicates a lightweight high strength car tail-gate electricity drives reduction gear for electric automobile tail-gate lifting switch.

Background

The tail gate electric drive speed reducer of the automobile is called a tail gate speed reducer for short, and the tail gate speed reducer is a component for reducing the rotating speed of a motor and then driving the tail gate of the automobile to lift and open and close; with the increasing development of automobiles, the quality of the tail gate speed reducer is required to be improved towards high precision, high strength, long service life and light weight;

the tail gate speed reducer in the prior art adopts a worm gear and worm speed reducing mechanism made of copper alloy materials, and has a large volume and a diameter larger than or equal to 26 mm; the weight is more than or equal to 70 g, and the weight is 24 parts; the requirement of further lightening the tail gate speed reducer by foreign vehicle enterprises is difficult to meet; in addition, the structure is complicated, the processing assembly is loaded down with trivial details, and production efficiency is low, and comprehensive cost is high, consequently, prior art exists bulky, the weight is heavy, be difficult to further lightweight, problem and not enough that inefficiency, with high costs.

Disclosure of Invention

To the problems and deficiencies existing in the prior art, the utility model discloses a device that comprises second grade planetary reducer, connector and shaft coupling, wherein, second grade planetary reducer comprises speed reducer shell, wheel core A and wheel core B, the speed reducer shell is cylindrical tubular plastics component, and the lumen inner wall of speed reducer shell is equipped with cylindrical interior skewed tooth and is called interior skewed tooth, and the breach that the left side bead equipartition of speed reducer shell was equipped with four rectangles is called the tongue-and-groove, and the upper and lower two of the pipe wall on the left side of speed reducer shell still is equipped with the through-hole of two rectangles respectively and is called the bayonet socket; a four-petal conical head cylindrical conical head buckle for connecting a motor is convexly arranged on the right side of the speed reducer shell; the A wheel core consists of an A core shell, an A shaft frame, an A planet gear and an A revolution gear, wherein the A core shell is a cylindrical cup-shaped plastic component with an open right surface and a closed left surface, and a cylindrical excircle helical gear which protrudes leftwards is arranged at the center of the left surface of the A core shell and is called the A revolution gear; the inner cavity of the core shell A is called an A wheel cavity, and the cavity wall of the A wheel cavity is uniformly provided with three rectangular through holes called an A wheel opening; the shaft bracket A is an annular plastic component, and three cylindrical wheel shafts protruding rightwards are uniformly distributed on the left surface of the shaft bracket A; a cylindrical external bevel gear with an exposed rim is arranged in each wheel hole A and is called as an A planetary gear, an A shaft bracket is positioned on the right side surface of the A core shell, and the A planetary gear can rotate through a wheel shaft of the A shaft bracket and is connected with the A core shell; the B wheel core consists of a B core shell, a B shaft frame, a B planet gear and a B revolution gear, wherein the B core shell is a cylindrical cup-shaped plastic component with an open right surface and a closed left surface, and a cylindrical outer spur gear which protrudes leftwards is arranged at the center of the left surface of the B core shell and is called as the B revolution gear; an inner cavity of the core shell B is called a wheel B cavity, and four rectangular through holes are uniformly distributed on the cavity wall of the wheel B cavity and called wheel B ports; the B shaft frame is a circular plastic component, and four cylindrical wheel shafts protruding rightwards are uniformly distributed on the left surface of the B shaft frame; a cylindrical external bevel gear with an exposed rim is arranged in each B wheel hole and is called as a B planetary gear, a B shaft bracket is positioned on the right side surface of the B core shell, and the B planetary gear can rotate through a wheel shaft of the B shaft bracket and is connected with the B core shell; the A wheel core is connected in series with the right surface of the B wheel core, and the A revolution gear of the A wheel core is inserted into the center of the B wheel core and is meshed with the four B planet gears; the gear core A and the gear core B are jointly positioned in the reducer shell, and the planetary gear A and the planetary gear B are meshed and connected with the inner helical teeth of the reducer shell;

the connector is a cylindrical tubular plastic component, the left part of the outer wall of the connector is provided with a connecting key with a rectangular cross section, the right part of the outer wall of the connector is provided with a convex rib which is called a tenon and corresponds to the mortise of the reducer shell, and the right part of the outer wall of the connector is also provided with an inclined flange which is called a hook and corresponds to the bayonet of the reducer shell;

the coupling is a plastic component with the main view projection in an inverted concave shape, and a through hole with cylindrical inner circle straight teeth is arranged in the center of the coupling and is called a tooth hole;

the connector is positioned on the left surface of the secondary planetary reducer, the tenon of the connector is correspondingly bonded and connected with the mortise of the reducer shell, and the hook buckle of the connector is correspondingly buckled and connected with the bayonet of the reducer shell; the B revolution gear of the B wheel core is positioned in the inner cavity of the connector, and the coupling is in meshed connection with the B revolution gear through the tooth hole; when the planetary gear reducer is used, the motor is positioned on the right side of the secondary planetary reducer, the secondary planetary reducer is connected with the motor buckle through the conical head buckle of the reducer shell, and a motor output gear of the motor is inserted into the center of the wheel core A and is in meshed connection with the three planetary gears A; the connector is fixedly connected with a mechanism of the automobile tail gate through the connecting key, and the coupling is connected with a lifting transmission mechanism of the automobile tail gate;

when the speed reducer works, the motor drives the wheel core A to perform primary planetary speed reduction on the rotating speed of the motor through the inner helical teeth of the speed reducer shell by the motor output gear, and then the revolution gear A of the wheel core A drives the wheel core B to perform secondary planetary speed reduction through the inner helical teeth; the technical scheme that the technical indexes of the tail gate speed reducer are required to rotate speed, torque, body and further light weight is met by the secondary planetary speed reducer with the inner skewed tooth structure, which is made of all-plastic materials, and the wheel cores A and B are connected in series and share the speed reducer shell, and the light-weight and high-strength automobile tail gate electric-driven speed reducer is provided.

The purpose of the utility model is realized like this: the utility model provides a lightweight high strength car tail-gate electricity drives reduction gear, includes second grade planetary reducer, connector and shaft joint, wherein: the two-stage planetary reducer is composed of a reducer shell, an A wheel core and a B wheel core, wherein the reducer shell is a cylindrical tubular plastic component, cylindrical inner circle oblique teeth are arranged on the inner wall of a tube cavity of the reducer shell and are called inner oblique teeth, four rectangular gaps are uniformly distributed on the left edge opening of the reducer shell and are called mortises, and two rectangular through holes are respectively arranged at the upper part and the lower part of the left tube wall of the reducer shell and are called bayonets; a four-petal conical head cylindrical conical head buckle for connecting a motor is convexly arranged on the right side of the speed reducer shell;

the A wheel core consists of an A core shell, an A shaft frame, an A planet gear and an A revolution gear, wherein the A core shell is a cylindrical cup-shaped plastic component with an open right surface and a closed left surface, and a cylindrical excircle helical gear which protrudes leftwards is arranged at the center of the left surface of the A core shell and is called the A revolution gear; the inner cavity of the core shell A is called an A wheel cavity, and the cavity wall of the A wheel cavity is uniformly provided with three rectangular through holes called an A wheel opening; the shaft bracket A is an annular plastic component, and three cylindrical wheel shafts protruding rightwards are uniformly distributed on the left surface of the shaft bracket A; a cylindrical external bevel gear with an exposed rim is arranged in each wheel hole A and is called as an A planetary gear, an A shaft bracket is positioned on the right side surface of the A core shell, and the A planetary gear can rotate through a wheel shaft of the A shaft bracket and is connected with the A core shell;

the B wheel core consists of a B core shell, a B shaft frame, a B planet gear and a B revolution gear, wherein the B core shell is a cylindrical cup-shaped plastic component with an open right surface and a closed left surface, and a cylindrical outer spur gear which protrudes leftwards is arranged at the center of the left surface of the B core shell and is called as the B revolution gear; an inner cavity of the core shell B is called a wheel B cavity, and four rectangular through holes are uniformly distributed on the cavity wall of the wheel B cavity and called wheel B ports; the B shaft frame is a circular plastic component, and four cylindrical wheel shafts protruding rightwards are uniformly distributed on the left surface of the B shaft frame; a cylindrical external bevel gear with an exposed rim is arranged in each B wheel hole and is called as a B planetary gear, a B shaft bracket is positioned on the right side surface of the B core shell, and the B planetary gear can rotate through a wheel shaft of the B shaft bracket and is connected with the B core shell;

the A wheel core is connected in series with the right surface of the B wheel core, and the A revolution gear of the A wheel core is inserted into the center of the B wheel core and is meshed with the four B planet gears; the gear core A and the gear core B are jointly positioned in the reducer shell, and the planetary gear A and the planetary gear B are meshed and connected with the inner helical teeth of the reducer shell;

the connecting head is a cylindrical tubular plastic component, a connecting key with a rectangular cross section is arranged at the left part of the outer wall of the connecting head, a convex rib corresponding to the mortise of the reducer casing is arranged at the right part of the outer wall of the connecting head and is called a tenon, and an inclined flange corresponding to the bayonet of the reducer casing is also arranged at the right part of the outer wall of the connecting head and is called a hook;

the coupling is a plastic component with the main view projection in an inverted concave shape, and a through hole with cylindrical inner circle straight teeth is arranged at the center of the coupling and is called a tooth hole;

the gear parameters of the planetary gear A, the revolution gear A and the planetary gear B are the same;

the connector is positioned on the left surface of the secondary planetary reducer, the tenon of the connector is correspondingly bonded and connected with the mortise of the reducer shell, and the hook buckle of the connector is correspondingly buckled and connected with the bayonet of the reducer shell; the B revolution gear of the B wheel core is positioned in the inner cavity of the connector, and the coupling is in meshed connection with the B revolution gear through the tooth hole; when the planetary gear reducer is used, the motor is positioned on the right side of the secondary planetary reducer, the secondary planetary reducer is connected with the motor buckle through the conical head buckle of the reducer shell, and a motor output gear of the motor is inserted into the center of the wheel core A and is in meshed connection with the three planetary gears A; the connector is fixedly connected with the mechanism of the automobile tail door through the connecting key, and the coupling is connected with the lifting transmission mechanism of the automobile tail door.

Working principle and beneficial effects

When the speed reducer works, the motor drives the wheel core A to perform primary planetary speed reduction through the inner helical teeth of the speed reducer shell through the motor output gear, and then the revolution gear A of the wheel core A drives the wheel core B to perform secondary planetary speed reduction through the inner helical teeth.

The device adopts a secondary planetary reducer with an inner helical tooth structure, wherein a wheel core A and a wheel core B are connected in series and share a reducer shell, so that the requirements of the technical indexes of the tail gate reducer on the rotating speed, the torque, the shape and the further light weight are met; because the two-stage planetary reduction structure is adopted, all mechanical strength technical indexes of the tail gate reducer can be met by adopting all plastic materials; the effect of adopting full plastics material is: the weight is light, the mass injection molding production cost is low, the connection, assembly and processing of the buckle and the groove tenon are convenient and quick, the efficiency is high, and the comprehensive cost is low; the device has small volume and diameter less than or equal to 26 mm; the weight is light, and is less than or equal to 23 grams; the device has few parts, and the number of the parts is 16 in total, wherein 9 parts are adopted; the production and application of the tail gate speed reducer reduce the volume, reduce the weight, further lighten the weight, improve the production and processing efficiency and reduce the comprehensive cost.

The utility model adopts a device composed of a second-stage planetary reducer, a connector and a coupling, wherein the second-stage planetary reducer is composed of a reducer shell, a wheel core A and a wheel core B, the reducer shell is a cylindrical tubular plastic component, and the reducer shell is provided with inner helical teeth, a mortise, a bayonet and a conical head buckle; the A wheel core is provided with an A core shell, an A shaft bracket, a wheel shaft, an A planet gear and an A revolution gear; the B wheel core is provided with a B core shell, a B shaft frame, a B planet gear and a B revolution gear; the connector is provided with a connecting key, a tenon and a hook; the coupling is provided with a tooth hole; when the speed reducer works, the motor drives the wheel core A to perform primary planetary speed reduction on the rotating speed of the motor through the inner helical teeth of the speed reducer shell by the motor output gear, and then the revolution gear A of the wheel core A drives the wheel core B to perform secondary planetary speed reduction through the inner helical teeth; adopt the A wheel core of full plastics material, the second grade planetary reducer of the interior skewed tooth structure of B wheel core series connection sharing speed reducer shell satisfies the technical index of tail gate reduction gear to the rotational speed, the moment of torsion, the physique and the technical scheme of further lightweight requirement, it is bulky to have overcome prior art existence, the weight is heavy, be difficult to further lightweight, inefficiency, problem and not enough with high costs, the lightweight high strength car tail gate electricity that provides drives the reduction gear, make the production and the application of car tail gate electricity drive reduction gear, reach and reduce the volume, lighten weight, further lightweight, and the efficiency is improved, the purpose of reduce cost.

Drawings

Fig. 1 is a schematic view of a main sectional view of a lightweight high-strength electric-driven speed reducer for a tail gate of an automobile according to the present invention;

fig. 2 is a schematic sectional view of the lightweight high-strength electric-driven reducer casing 11 and the connecting head 2 of the rear door of the automobile according to the present invention;

fig. 3 is an axis measuring view showing the mutual connection state of the wheel core a 12, the wheel core B13 and the coupling 3 of the electric-driven speed reducer for the rear door of the light-weight and high-strength automobile of the present invention;

fig. 4 is a left-view axial analysis schematic diagram of the wheel core a 12, the wheel core B13 and the coupling 3 of the electric-driven speed reducer for the rear door of the light-weight and high-strength automobile of the present invention;

fig. 5 is a schematic diagram of the right-view axis measurement and decomposition of the wheel core a 12, the wheel core B13 and the coupling 3 of the electric-driven speed reducer for the rear door of the light-weight and high-strength automobile of the present invention;

fig. 6 is a left visual axis measuring and indicating view of the lightweight high-strength electric-driven reducer for the tail gate of the automobile of the present invention, wherein the reducer case 11 and the connecting head 2 are separated from each other;

fig. 7 is a right-view axis schematic diagram of the lightweight high-strength electric-driven reducer for the tail gate of the automobile of the present invention, wherein the reducer case 11 and the connecting head 2 are separated from each other;

fig. 8 is the utility model discloses a light-weight high strength car tail-gate electricity drives axle measuring with 01 mutual position of motor and relation of connection when reduction gear uses and shows the intention, is the detached state in the picture.

The invention will be described in more detail below with reference to an exemplary embodiment shown in the drawings, which should not be construed as limiting the invention in any way.

In the figure: the two-stage planetary reducer comprises a two-stage planetary reducer 1, a reducer shell 11, inner helical teeth 112, a mortise 113, a bayonet 114, a conical head buckle 115, an A wheel core 12, an A core shell 121, an A shaft frame 122, a wheel shaft 1221, an A planetary gear 123, an A revolving gear 124, a B wheel core 13, a B core shell 131, a B shaft frame 132, a B planetary gear 133, a B revolving gear 134, a connector 2, a connecting key 21, a tenon 22, a hook buckle 23, a coupling 3, a tooth hole 31, a motor 01 and a motor output gear 02.

Detailed Description

Referring to fig. 1-8, the utility model discloses a lightweight high strength car tail-gate electricity drives reduction gear, including second grade planetary reducer 1, connector 2 and shaft coupling 3, wherein: the two-stage planetary reducer 1 is composed of a reducer shell 11, an A wheel core 12 and a B wheel core 13, the reducer shell 11 is a cylindrical tubular plastic component, cylindrical inner circle helical teeth are arranged on the inner wall of a tube cavity of the reducer shell 11 and are called inner helical teeth 112, four rectangular gaps are uniformly distributed on the left edge opening of the reducer shell 11 and are called mortises 113, and two rectangular through holes are respectively arranged on the upper part and the lower part of the left tube wall of the reducer shell 11 and are called bayonets 114; a four-petal conical head cylindrical conical head buckle 115 for connecting a motor is arranged on the right side of the speed reducer shell 11 in a protruding mode;

the A wheel core 12 consists of an A core shell 121, an A shaft bracket 122, an A planet gear 123 and an A revolution gear 124, wherein the A core shell 121 is a plastic component with an open right surface and a closed cylindrical cup-shaped left surface, and a cylindrical excircle helical gear which protrudes leftwards is arranged at the center of the left surface of the A core shell 121 and is called the A revolution gear 124; the inner cavity of the core shell 121A is called an A wheel cavity, and the cavity wall of the A wheel cavity is uniformly provided with three rectangular through holes called A wheel openings; the A shaft bracket 122 is a circular plastic component, and three cylindrical wheel shafts 1221 protruding rightwards are uniformly distributed on the left surface of the A shaft bracket 122; a cylindrical external bevel gear with an exposed rim is arranged in each wheel hole A and is called as an A planetary gear 123, the A shaft bracket 122 is positioned on the right side surface of the A core shell 121, and the A planetary gear 123 can rotate and is connected with the A core shell 121 through a wheel shaft 1221 of the A shaft bracket 122;

the B wheel core 13 is composed of a B core shell 131, a B shaft bracket 132, a B planet gear 133 and a B revolution gear 134, the B core shell 131 is a plastic component with an open right surface and a closed cylindrical cup shape on the left surface, and a cylindrical outer spur gear which protrudes leftwards is arranged at the center of the left surface of the B core shell 131 and is called as the B revolution gear 134; the inner cavity of the core shell 131 is called a wheel B cavity, and four rectangular through holes are uniformly distributed on the cavity wall of the wheel B cavity and called wheel B ports; the B-shaft bracket 132 is a circular plastic component, and four cylindrical wheel shafts 1221 protruding rightwards are uniformly distributed on the left surface of the B-shaft bracket 132; a cylindrical external bevel gear with an exposed rim is arranged in each B wheel hole and is called as a B planetary gear 133, the B shaft bracket 132 is positioned on the right side surface of the B core shell 131, and the B planetary gear 133 can rotate and is connected with the B core shell 131 through a wheel shaft 1221 of the B shaft bracket 132;

the A wheel core 12 is connected in series with the right side of the B wheel core 13, and the A revolution gear 124 of the A wheel core 12 is inserted into the center of the B wheel core 13 and is in meshed connection with the four B planet gears 133; the wheel core 12A and the wheel core 13B are jointly positioned in the reducer shell 11, and the planet gears 123A and the planet gears 133B are meshed with the inner helical teeth 112 of the reducer shell 11;

the connector 2 is a cylindrical tubular plastic component, the left part of the outer wall of the connector 2 is provided with a connecting key 21 with a rectangular cross section, the right part of the outer wall of the connector 2 is provided with a convex rib called a tenon 22 corresponding to the mortise 113 of the reducer casing 11, and the right part of the outer wall of the connector 2 is also provided with an inclined flange called a buckle 23 corresponding to the bayonet 114 of the reducer casing 11;

the coupling 3 is a plastic component with a main view projection in an inverted concave shape, and a through hole with cylindrical inner circle straight teeth is arranged at the center of the coupling 3 and is called as a tooth hole 31;

the gear parameters of the A planetary gear 123, the A revolution gear 124 and the B planetary gear 133 are the same;

the connector 2 is positioned on the left surface of the secondary planetary reducer 1, the tenon 22 of the connector 2 is correspondingly bonded and connected with the mortise 113 of the reducer casing 11, and the hook 23 of the connector 2 is correspondingly buckled and connected with the bayonet 114 of the reducer casing 11; the B revolution gear 134 of the B wheel core 13 is positioned in the inner cavity of the connector 2, and the coupling 3 is meshed and connected with the B revolution gear 134 through the tooth hole 31; when the device is used, the motor 01 is positioned on the right side of the secondary planetary reducer 1, the secondary planetary reducer 1 is connected with the motor 01 in a buckling mode through the conical head buckle 115 of the reducer shell 11, and the motor output gear 02 of the motor 01 is inserted into the center of the wheel core 12A and is meshed with the three planet gears 123A; the connector 2 is fixedly connected with the mechanism of the automobile tail door through the connecting key 21, and the coupling 3 is connected with the lifting transmission mechanism of the automobile tail door.

Working principle and beneficial effects

In operation, the motor 01 drives the wheel core a 12 to perform a first-stage planetary reduction on the rotation speed of the motor 01 through the inner helical teeth 112 of the reducer housing 11 via the motor output gear 02, and then the revolution gear a 124 of the wheel core a 12 drives the wheel core B13 to perform a second-stage planetary reduction through the inner helical teeth 112.

The device adopts a secondary planetary reducer 1 with an A wheel core 12 and a B wheel core 13 which are connected in series and share the inner helical tooth 112 structure of a reducer shell 11, and meets the requirements of the technical indexes of a tail gate reducer on the rotating speed, the torque, the shape and the further light weight; because the two-stage planetary reduction structure is adopted, all mechanical strength technical indexes of the tail gate reducer can be met by adopting all plastic materials; the effect of adopting full plastics material is: the weight is light, the mass injection molding production cost is low, the connection, assembly and processing of the buckle and the groove tenon are convenient and quick, the efficiency is high, and the comprehensive cost is low; the device has small volume and diameter less than or equal to 26 mm; the weight is light, and is less than or equal to 23 grams; the device has few parts, and the number of the parts is 16 in total, wherein 9 parts are adopted; the production and application of the tail gate speed reducer reduce the volume, reduce the weight, further lighten the weight, improve the production and processing efficiency and reduce the comprehensive cost.

Claims (1)

1. The utility model provides a lightweight high strength car tail-gate electricity drives reduction gear, includes second grade planetary reducer (1), connector (2) and shaft coupling (3), its characterized in that: the two-stage planetary reducer (1) is composed of a reducer shell (11), an A wheel core (12) and a B wheel core (13), the reducer shell (11) is a cylindrical tubular plastic component, cylindrical inner circle oblique teeth are arranged on the inner wall of a tube cavity of the reducer shell (11) and are called inner oblique teeth (112), four rectangular notches are uniformly distributed on the left edge opening of the reducer shell (11) and are called mortises (113), and two rectangular through holes are respectively arranged at the upper part and the lower part of the left tube wall of the reducer shell (11) and are called bayonets (114); a four-petal conical head cylindrical conical head buckle (115) for connecting a motor is convexly arranged on the right surface of the speed reducer shell (11);

the A wheel core (12) is composed of an A core shell (121), an A shaft bracket (122), an A planet gear (123) and an A revolution gear (124), the A core shell (121) is a cylindrical cup-shaped plastic component with an open right surface and a closed left surface, and a cylindrical excircle helical gear which protrudes leftwards is arranged at the center of the left surface of the A core shell (121) and is called the A revolution gear (124); the inner cavity of the core shell (121) A is called as a wheel cavity A, and three rectangular through holes are uniformly distributed on the wall of the wheel cavity A and called as wheel openings A; the A shaft bracket (122) is a circular plastic component, and three cylindrical wheel shafts (1221) protruding rightwards are uniformly distributed on the left surface of the A shaft bracket (122); a cylindrical external bevel gear with an exposed rim is arranged in each wheel hole A and is called as an A planetary gear (123), an A shaft bracket (122) is positioned on the right side surface of the A core shell (121), and the A planetary gear (123) can rotate and is connected with the A core shell (121) through a wheel shaft (1221) of the A shaft bracket (122);

the B wheel core (13) is composed of a B core shell (131), a B shaft frame (132), a B planet gear (133) and a B revolution gear (134), the B core shell (131) is a cylindrical cup-shaped plastic component with an open right surface and a closed left surface, and a cylindrical outer spur gear which protrudes leftwards is arranged at the center of the left surface of the B core shell (131) and is called the B revolution gear (134); an inner cavity of the core shell (131) B is called a wheel B cavity, and four rectangular through holes are uniformly distributed on the wall of the wheel B cavity and called wheel B openings; the B-shaft frame (132) is a circular plastic component, and four cylindrical wheel shafts (1221) protruding rightwards are uniformly distributed on the left surface of the B-shaft frame (132); a cylindrical external bevel gear with an exposed rim is arranged in each B wheel hole and is called as a B planetary gear (133), the B shaft bracket (132) is positioned on the right side surface of the B core shell (131), and the B planetary gear (133) can rotate and is connected with the B core shell (131) through a wheel shaft (1221) of the B shaft bracket (132);

the A wheel core (12) is connected in series to the right of the B wheel core (13), and the A revolution gear (124) of the A wheel core (12) is inserted into the center of the B wheel core (13) and is meshed with the four B planet gears (133); the wheel core A (12) and the wheel core B (13) are jointly positioned in the reducer shell (11), and the planet gear A (123) and the planet gear B (133) are in meshed connection with the inner helical teeth (112) of the reducer shell (11);

the connecting head (2) is a cylindrical tubular plastic component, a connecting key (21) with a rectangular cross section is arranged at the left part of the outer wall of the connecting head (2), a convex rib corresponding to the mortise (113) of the speed reducer shell (11) is arranged at the right part of the outer wall of the connecting head (2) and is called a tenon (22), and a slope flange corresponding to the bayonet (114) of the speed reducer shell (11) is also arranged at the right part of the outer wall of the connecting head (2) and is called a hook buckle (23);

the coupling (3) is a plastic component with a main view projection in an inverted concave shape, and a through hole with cylindrical inner circle straight teeth is arranged at the center of the coupling (3) and is called as a tooth hole (31);

the gear parameters of the planet gear A (123), the revolution gear A (124) and the planet gear B (133) are the same;

the connector (2) is positioned on the left surface of the secondary planetary reducer (1), the tenon (22) of the connector (2) is correspondingly bonded and connected with the mortise (113) of the reducer shell (11), and the hook buckle (23) of the connector (2) is correspondingly buckled and connected with the bayonet (114) of the reducer shell (11); the B revolution gear (134) of the B wheel core (13) is positioned in the inner cavity of the connector (2), and the coupling (3) is meshed and connected with the B revolution gear (134) through the tooth hole (31); when the device is used, the motor (01) is positioned on the right side of the secondary planetary reducer (1), the secondary planetary reducer (1) is connected with the motor (01) in a buckling mode through the conical head buckle (115) of the reducer shell (11), and a motor output gear (02) of the motor (01) is inserted into the center of the wheel core (12) A and is meshed with the three planet gears (123) A; the connector (2) is fixedly connected with the mechanism of the automobile tail door through the connecting key (21), and the coupling (3) is connected with the lifting transmission mechanism of the automobile tail door.

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