Automobile tail gate rotating motor

Abstract

This utility model provides a car tailgate rotating motor, including a drive motor body. One end of the drive motor body has a circumferential array of mounting screw holes. A reduction gear assembly is mounted on one end of the drive motor body, and a rear end cover assembly is mounted on the other end. The reduction gear assembly includes a reduction gearbox, which is mounted on one end of the drive motor body. A cavity partition is fixedly connected to the inner wall of the reduction gearbox. The inner cavity of the reduction gearbox is divided into a transmission cavity and an oil storage cavity by the cavity partition. An input shaft sleeve is fixedly connected to the center of the oil storage cavity. Lubrication tubes are arranged circumferentially inside the oil storage cavity, and an oil-collecting cotton core is fixedly connected inside each lubrication tube. Oil replenishment holes are opened on the circumferential surface of the lubrication tubes. The mutual cooperation of the drive motor body, mounting screw holes, reduction gear assembly, rear end cover assembly, and electronic control cover assembly ensures that the device avoids the situation where gears cannot be lubricated, leading to severe gear wear and reduced transmission efficiency during use.

Description

Technical Field

[0001] This utility model relates to the technical field of automobile tailgate rotating motors, specifically to an automobile tailgate rotating motor. Background Technology

[0002] With the increasing electrification of automobiles, power tailgates have become a standard feature in modern cars. As a core component of the power tailgate system, the performance and reliability of the tailgate motor directly affect the lifespan of the entire system and the user experience. Currently, most automotive tailgate motors on the market use planetary gear reduction mechanisms, which have advantages such as small size, large reduction ratio, and strong load-bearing capacity.

[0003] Electric tailgate struts, a common type of mechatronic actuator, primarily rely on a motor-driven mechanical transmission system to convert the motor's rotational motion into linear push-pull movements. Specifically, when the motor is energized, its output shaft increases torque and reduces speed through a reduction mechanism, thereby driving a lead screw or push rod to achieve linear extension and retraction. To ensure precise operation, electric struts typically incorporate limit switches or Hall effect sensors to monitor the stroke position in real time, working in conjunction with a control module to achieve precise start / stop and speed adjustment. Through the efficient conversion of electrical energy to mechanical energy, combined with overload protection mechanisms, electric struts provide stable, low-noise load-bearing support or position adjustment functions, and are widely used in industrial fields such as automotive tailgates.

[0004] In the transmission system of electric struts, planetary gear mechanisms have become the core component for power transmission between the motor and the output shaft due to their advantages such as compact structure, high transmission efficiency, and strong load-bearing capacity. However, existing planetary gear structures face serious lubrication problems during long-term operation, directly affecting the reliability and service life of the transmission system. In practical applications, the lubrication problem of planetary gear mechanisms has always been a key factor affecting their service life and reliability. Existing technologies offer various solutions to the lubrication problem of reducers.

[0005] For example, CN118249572A proposes an integrated oil-cooling system structure for the reducer and motor. This structure integrates the oil pump and filter on the stator assembly housing, achieving compact size, lightweight, high efficiency, high speed, and quiet operation. However, this system requires additional power to drive the oil pump, increasing energy consumption. Specifically, the independent dual-pump system (motor oil pump and reducer oil pump) configured to achieve precise oil supply to the reducer and motor requires additional drive power, significantly increasing system operating energy consumption. In other words, the proposed system needs to simultaneously drive the motor oil pump (responsible for motor-side cooling oil circulation) and the reducer oil pump (responsible for reducer-side cooling oil circulation). The motor power consumption of the two oil pumps is directly added to the overall vehicle electrical system, leading to increased overall electric drive power loss.

[0006] Therefore, there is an urgent need for a simple, self-lubricating automobile tailgate rotary motor that can achieve continuous and effective lubrication of the gear meshing surfaces by utilizing the motion characteristics of the planetary gear system itself without increasing additional power consumption, while also being easy to assemble and maintain. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a car tailgate rotating motor, which solves the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A tailgate rotary motor for automobiles includes a drive motor body, a reduction gear assembly, a rear cover assembly, and an electronic control cover assembly. The reduction gear assembly integrates a lubrication structure, comprising: a reduction gearbox body, the inner cavity of which is divided into a gear transmission chamber and an oil storage chamber by a chamber partition; an input shaft sleeve, fixed to the center of the oil storage chamber and penetrating the chamber partition; a lubrication system structure, including: multiple oil seepage pipes arranged circumferentially within the oil storage chamber, oil-retaining cotton cores filled within the oil seepage pipes, and oil replenishment holes formed on the peripheral walls of the oil seepage pipes; and a planetary gear mechanism located within the gear transmission chamber. It includes: an internal gear ring fixed to the inner wall of the gear transmission cavity, a sun gear connected to the output shaft of the drive motor body, a planetary carrier rotatably connected to the bottom of the gear transmission cavity, an output spline shaft fixed to the bottom of the planetary carrier, and planetary gears mounted on the planetary carrier and meshing with the sun gear and the internal gear ring; wherein, the lubricating oil in the oil storage cavity seeps into the oil storage cotton core through the oil replenishment hole and is continuously supplied to the meshing surface of the planetary gears by centrifugal force; a rear end cover assembly fixed to the non-output end of the drive motor body; and an electronic control cover assembly detachably mounted on the rear end cover assembly.

[0010] Furthermore, the planetary carrier is coaxially fixed with the output spline shaft. The centrifugal force generated during the revolution of the planetary gears drives the lubricating oil in the oil seepage pipe to be thrown radially toward the gear meshing area, forming a self-sustaining oil film.

[0011] Furthermore, the gearbox body and the drive motor body are connected by a snap-fit ​​structure, which includes: a mounting screw hole circumferentially formed on the outer shell of the drive motor body; and an elastic mounting hook 309 fixed to the opening end of the gearbox body, which, after deformation, engages with the mounting screw hole to achieve axial locking.

[0012] Furthermore, the rear end cover assembly includes: a motor rear end cover, the central area of ​​which has a hole through which the motor shaft passes, and is fixedly connected to the rear end housing of the drive motor body by screws or clips at its edge position to close the rear end of the motor and provide an electrical interface base; a sealing ring, fixedly connected to the outer edge of the motor rear end cover to form a raised annular wall; and a rotating snap-fit ​​groove, which is provided on the end face or side wall of the sealing ring, and has multiple L-shaped grooves evenly opened along the circumferential direction, wherein each groove consists of an insertion section and a locking section, for cooperating with the elastic snap-fit ​​block on the electric control cover assembly to achieve a quick rotation locking connection.

[0013] Furthermore, the electronic control cover assembly includes: an electronic control end cover, installed on one side of the motor rear end cover, and its cross-sectional structure is adapted to the cross-sectional structure of the sealing ring; a control circuit board, fixedly installed in the inner cavity of the electronic control end cover; a cable sealing hole, opened on the side wall of the electronic control end cover, for leading out the power line and signal wire harness connecting the control circuit board; elastic buckle blocks, fixedly connected at equal intervals to the inner wall edge of the electronic control end cover, and its end is provided with a protrusion or hook-shaped structure; and an annular sealing gasket, whose cross-sectional structure is O-type or D-type, fixedly installed on the mating surface of the electronic control end cover and the motor rear end cover and / or the sealing ring. When the electronic control cover assembly is installed in place, the annular sealing gasket is compressed between the electronic control end cover and the sealing ring to form a reliable radial and / or end face seal.

[0014] Furthermore, the axis of the oil seepage pipe is parallel to the input shaft sleeve, and one end of it is fixed to the cavity partition and close to the inner wall of the gearbox, while the other end extends to the closed end of the oil storage cavity; the oil storage cotton core is made of highly absorbent composite fiber cotton, and its capillary adsorption effect allows the lubricating oil to be slowly released to the end of the oil seepage pipe near the gear transmission cavity.

[0015] Furthermore, the input shaft sleeve is interference-fitted with the cavity partition, and a rotating sealing ring is provided in its inner hole to isolate the lubricating oil.

[0016] Furthermore, the control circuit board integrates an electrically interconnected motor drive chip, microcontroller, position feedback circuit, communication interface, and overload protection circuit, and is connected to the electrical interface of the drive motor body via pins.

[0017] Furthermore, the volume of the oil storage chamber is greater than the total volume of the oil seepage pipe, so as to form a lubricating oil storage space.

[0018] This utility model provides a motor for rotating a car tailgate. Compared with the prior art, it has the following advantages:

[0019] This invention achieves long-term lubrication of gear components through the coordinated operation of an oil reservoir, lubrication pipe, oil reservoir core, and oil replenishment hole. This prevents wear on the gears, which can lead to decreased gear transmission efficiency and increases the overall service life. Simultaneously, the coordinated operation of the rear end cover assembly and the electronic control cover assembly connects the control circuit board to the drive motor body and seals the control circuit board, preventing moisture ingress and corrosion. Compared to existing technologies, this invention solves the problem of grease detaching from the gear contact surface due to centrifugal force during high-speed operation of planetary gear mechanisms. Through the designed oil reservoir and oil seepage system, the centrifugal force generated by the planetary gears drives the lubricating oil to flow back to the meshing area, creating a continuous and stable lubrication effect, significantly extending the service life and reliability of the gear system. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This invention illustrates a structural diagram of the speed reduction transmission assembly that achieves continuous and stable lubrication.

[0022] Figure 2 A schematic diagram of the speed reduction transmission assembly of this utility model is shown;

[0023] Figure 3 A schematic diagram of the overall structure of this utility model is shown;

[0024] Figure 4 A schematic diagram of the gear component of this utility model is shown;

[0025] Figure 5 This diagram shows a partially enlarged cross-sectional view of the speed reduction transmission assembly of this utility model;

[0026] Figure 6 A schematic diagram of the drive motor body of this utility model is shown;

[0027] Figure 7 A schematic diagram of the rear end cover assembly of this utility model is shown;

[0028] Figure 8 A schematic diagram of the electronically controlled cover assembly of this utility model is shown;

[0029] Figure 9 A partial schematic diagram of the electronically controlled cover assembly of this utility model is shown;

[0030] As shown in the figure:

[0031] 100. Drive motor body;

[0032] 200. Mounting screw holes;

[0033] 300. Reduction gear assembly; 301. Gearbox housing; 302. Cavity partition; 303. Transmission cavity; 304. Oil reservoir; 305. Input shaft sleeve; 306. Lubrication pipe; 307. Oil reservoir core; 308. Oil replenishment hole; 309. Mounting hook; 310. Internal gear ring; 311. Sun gear; 312. Planetary carrier; 313. Output splined shaft; 314. Planetary gear;

[0034] 400. Rear end cover assembly; 401. Motor rear end cover; 402. Sealing ring; 403. Rotary snap-fit ​​groove;

[0035] 500. Electrical control cover assembly; 501. Electrical control end cover; 502. Control circuit board; 503. Cable sealing hole; 504. Elastic buckle block; 505. Annular sealing gasket. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Example

[0037] To address the technical problems in the background section, the following automobile tailgate rotating motor is provided:

[0038] Combination Figure 1 , Figure 3 As shown, this utility model provides a car tailgate rotary motor, the purpose of which is to solve the long-term lubrication defect of planetary gear mechanisms in enclosed spaces. Specifically, it includes:

[0039] The drive motor body 100 serves as the core power source, providing rotational motion;

[0040] The reduction gear transmission assembly 300 is installed at the output end of the drive motor body 100 to convert the high speed and low torque of the motor into low speed and high torque output, and integrates the following lubrication structure.

[0041] The rear cover assembly 400 is fixed to the non-output end (rear end) of the drive motor body 100, providing structural support and electrical interface;

[0042] The electronic control cover assembly 500 is detachably mounted on the rear cover assembly 400 and contains the control circuitry responsible for receiving signals, driving the motor, and implementing protection logic.

[0043] like Figure 2-4 , Figure 5 As shown, in one embodiment of this utility model, the speed reduction transmission assembly 300 includes:

[0044] It should be noted that the gearbox 301 is a cylindrical shell with one end open. The open end is fixedly connected to the mounting screw hole 200 on the front shell of the drive motor body 100 by the mounting hook 309. This connection method facilitates assembly and subsequent maintenance and disassembly. The top of the gearbox 301 is provided with an oil filling hole, which is sealed by a sealing plug.

[0045] The cavity partition 302 is fixedly installed inside the gearbox 301 and close to one end of the drive motor body 100. It can be understood that it divides the inner cavity of the gearbox 301 into two independent chambers: the gear transmission chamber 303, located on the side close to the drive motor body 100, is used to accommodate the planetary gear mechanism; the oil storage chamber 304, located on the other side away from the drive motor body 100, is used to store lubricating oil.

[0046] The input shaft sleeve 305 is fixedly connected to the center of the oil reservoir 304, passes through the central hole of the cavity partition 302, and extends into the gear transmission cavity 303. The input shaft sleeve is interference-fitted with the cavity partition, and a rotary sealing ring is provided in its inner hole to isolate the lubricating oil. Its main function is to provide a sealed channel for the output shaft (i.e., the sun gear shaft) of the drive motor body 100 to pass through the oil reservoir 304 and enter the gear transmission cavity 303, thereby preventing lubricating oil from directly entering the motor. Simultaneously, it isolates a portion of the oil reservoir 304 and the gear transmission cavity 303, allowing oil penetration only through a specific lubrication structure.

[0047] The lubrication structure includes: multiple oil seepage pipes 306, preferably 3-6, evenly arranged in a circumferential array within the oil storage cavity 304. One end of each pipe is fixedly connected to the cavity partition 302 (fitting against the inner wall of the gearbox 301), and the other end is close to the closed end wall of the gearbox 301. The axis of the oil seepage pipe 306 is approximately parallel to the input shaft sleeve 305. An oil-retaining cotton core 307 tightly fills the internal cavity of each oil seepage pipe 306. Preferably, the core is made of a highly absorbent and oil-resistant fiber material (such as specially treated polyester fiber or composite cotton), thus possessing excellent capillary adsorption and slow-release properties. Oil replenishment holes 308 are formed on the circumferential wall of each oil seepage pipe 306. In practice, they are usually located in the area of ​​the oil seepage pipe 306 that is immersed in the lubricating oil in the oil storage chamber 304. The lubricating oil slowly seeps into the oil seepage pipe 306 through these oil replenishment holes 308 and is fully absorbed and stored by the oil storage cotton core 307, thereby achieving long-term lubrication of the gear components, avoiding wear of the gears in the gear components, which would lead to a decrease in gear transmission efficiency and increase the overall service life.

[0048] In one embodiment of this utility model, a gear component is installed in the transmission cavity 303 to form a planetary gear reduction mechanism.

[0049] like Figure 4 , Figure 6 As shown, the gear component includes:

[0050] The internal gear ring 310 is fixedly connected to the inner wall of the gear transmission cavity 303 as a fixed annular gear ring.

[0051] The sun gear 311 is fixedly connected to the output shaft of the drive motor body 100. It should be noted that the output shaft passes through the center hole of the input shaft sleeve 305 to input power into the reduction mechanism. At this time, the sun gear 311 serves as the center input gear of the planetary gear system.

[0052] The planet carrier 312 is rotatably connected to the center of the bottom surface of the gear transmission cavity 303 (i.e., the end wall away from the cavity partition 302) via a bearing. At this time, the planet carrier 312 serves as the carrier of the planetary gear 314 and the output end of the system.

[0053] The output spline shaft 313 is fixedly connected (preferably by welding or keying) to the center of the bottom surface of the planetary carrier 312 and extends out of the bottom of the gearbox 301, thereby connecting with the spline sleeve of the screw or push rod mechanism of the electric strut to transmit rotational motion and torque.

[0054] Planetary gears 314, preferably 3-4 in number, are evenly distributed on the top surface of the planet carrier 312 via short shafts and bearings, and each planetary gear 314 simultaneously meshes with the central sun gear 311 and the peripherally fixed internal gear ring 310. When the sun gear 311 is driven to rotate by the motor, it forces the planetary gears 314 to rotate around their own axes (rotation) and roll along the internal gear ring 310 (revolution), thereby driving the planet carrier 312 and the output spline shaft 313 to rotate at a reduced speed and with an increased torque.

[0055] Based on the above technical concept, it should be noted that the principle of long-term lubrication during gear transmission is as follows: the lubricating oil stored in the oil storage chamber 304 continuously seeps into the pipe through the oil replenishment hole 308 on the peripheral wall of the oil seepage pipe 306. At this time, the highly absorbent oil storage cotton core 307 absorbs and stores the lubricating oil. Under the centrifugal force generated by the high-speed meshing operation of the planetary gear 314, and under the enhanced capillary effect caused by the slight heat generated during gear meshing, the lubricating oil stored in the oil storage cotton core 307 in the oil seepage pipe 306 will be slowly and continuously "thrown" towards the end of the oil seepage pipe 306 near the gear transmission cavity 303 (i.e., the cavity partition 302 end), and seeps out through the pores at this end or the design (in specific implementation, it can be directly exposed to the gear transmission cavity 303 or through a micro-channel according to design requirements), and wets the meshing area of ​​the planetary gear 314, the sun gear 311 and the internal gear ring 310, forming a stable oil film lubrication.

[0056] Understandably, this design utilizes centrifugal force to overcome the problem of traditional grease being thrown away from the meshing surface, achieving long-lasting, self-sustaining lubrication in a closed space without the need for external forced oil supply.

[0057] In one embodiment of this utility model, such as Figure 1 , Figure 2 , Figure 7 As shown, the rear cover assembly 400 includes:

[0058] The motor rear end cover 401 is preferably a disc-shaped or cup-shaped component made of metal (such as die-cast aluminum alloy) or high-strength plastic. Its central area has a hole (with a sealing structure) through which the motor shaft passes. It is fixedly connected to the rear end housing of the drive motor body 100 by screws or clips at its edge position. The purpose is to seal the rear end of the motor and provide an electrical interface base.

[0059] The sealing ring 402 is fixedly connected (preferably integrally molded or welded / bonded) to the outer edge of the motor rear end cover 401 (i.e. the side away from the motor body), forming a raised annular wall.

[0060] The rotating buckle groove 403 is located on the end face or side wall of the sealing ring 402, and has multiple (preferably 3-6) L-shaped grooves evenly opened along the circumferential direction. Each groove consists of an insertion section and a locking section, which are used to cooperate with the elastic buckle block 504 on the electric control cover assembly 500 to achieve a quick rotation and locking connection.

[0061] In one embodiment of this utility model, such as Figure 1 , Figure 2 , Figure 8 , Figure 9 As shown, the electronically controlled cover assembly 500 includes:

[0062] The electrical control end cover 501 is installed on one side of the motor rear end cover 401. In specific implementation, its shape is set to match the sealing ring 402. It is preferably designed as a cup-shaped cover and is made of insulating and weather-resistant plastic (such as PBT+GF). Its inner cavity accommodates the control circuit board 502.

[0063] The control circuit board 502 is fixedly installed in the inner cavity of the electronic control end cover 501 by bolts or other fasteners. In specific implementation, the board integrates electrically interconnected motor drive chips (such as H-bridge), microcontrollers (MCU), position feedback signal processing circuits (such as Hall signals), power management, communication interfaces (such as LIN / CAN), and necessary protection circuits (overcurrent, overheat, stall, etc.).

[0064] A cable sealing hole 503 is provided on the side wall or bottom of the electronic control end cover 501 to lead out the power supply and signal harness (such as the body control module BCM and position sensor) connecting to the control circuit board 502. Understandably, this hole is designed with a sealing structure (such as a rubber sealing ring, potting compound, or heat shrink tubing) to ensure a tight seal after wiring and prevent moisture from entering.

[0065] The number of elastic buckle blocks 504 matches the number of rotating buckle slots 403, and they are fixedly connected (preferably integrally injection molded) at equal intervals to the inner wall edge of the electronic control end cover 501. Each elastic buckle block 504 has elastic deformation capability, and its end is provided with a protrusion or hook-shaped structure.

[0066] The annular sealing gasket 505, in specific implementations, is preferably made of a rubber material with excellent elasticity (such as EPDM or silicone), and its cross-section can be O-shaped or D-shaped. It is installed on the mating surface of the electrical control end cover 501 and the motor rear end cover 401 and / or the sealing retaining ring 402. In this embodiment, the specific installation position can be: embedded in the annular groove on the edge of the electrical control end cover 501, or placed on the end face of the sealing retaining ring 402.

[0067] Once the electronic control cover assembly 500 is installed in place, the annular sealing gasket 505 is compressed between the electronic control end cover 501 and the sealing retainer ring 402, forming a reliable radial and / or end face seal.

[0068] In one embodiment of this utility model, the assembly and working principle flow of the automobile tailgate rotating motor is as follows:

[0069] Preparation of internal assembly and lubrication system for the 300 reduction gear transmission assembly:

[0070] a1. Press or fix the internal gear ring 310 into or fix it to the inner wall of the gear transmission cavity 303 of the gearbox body 301;

[0071] a2. Install the planetary gear 314 onto the planetary carrier 312 via a short shaft and bearings. At the same time, install the assembled planetary carrier 312 onto the center of the bottom surface of the gear transmission cavity 303 via bearings. Fix the output spline shaft 313 to the center of the bottom surface of the planetary carrier 312. Install and fix the cavity partition 302 in the designated position inside the gearbox 301 to separate the gear transmission cavity 303 and the oil storage cavity 304. Fix the input shaft sleeve 305 to the center hole of the cavity partition 302 and extend it to the middle of the oil storage cavity 304.

[0072] a3. Install the oil seepage pipes 306 array into the oil storage chamber 304 (one end is fixed to the chamber partition 302 or the box wall), and fill each oil seepage pipe 306 with oil storage cotton core 307.

[0073] a4. Open the sealing plug of the oil filling hole on the top of the gearbox 301, inject the specified type and volume of lubricating oil into the oil storage chamber 304. The lubricating oil seeps in through the oil filling hole 308 on the wall of the oil seepage pipe 306 and is fully absorbed by the oil storage cotton core 307 until saturation. Excess oil is stored in the oil storage chamber 304, and the oil filling hole is resealed.

[0074] b. Connection between the reduction gear assembly 300 and the drive motor body 100:

[0075] b1. Securely mount the sun gear 311 onto the output shaft of the drive motor body 100;

[0076] b2. Carefully insert the output end (with sun gear 311) of the drive motor body 100 into the open end of the gearbox 301, ensuring that the sun gear 311 passes through the center hole of the input shaft sleeve 305 and enters the gear transmission cavity 303, and meshes correctly with the planetary gear 314. At the same time, align the mounting hook 309 on the gearbox 301 with the mounting screw hole 200 on the housing of the drive motor body 100, and push the gearbox 301 towards the drive motor body 100. The hook-shaped part of the mounting hook 309 undergoes elastic deformation when inserted into the mounting screw hole 200. After the mounting hook 309 has completely passed through the mounting screw hole 200, its elasticity is restored, and the hook rebounds and locks into the inner edge of the mounting screw hole 200, firmly locking the reduction transmission assembly 300 onto the drive motor body 100.

[0077] c. Assembly of the electronically controlled cover assembly 500:

[0078] c1. Lead out the wire harness connecting the control circuit board 502 from the inside of the electronic control end cover 501 through the cable sealing hole 503;

[0079] c2. Use hot melt adhesive or other sealing materials (such as rubber sealing plugs) to seal the cable sealing holes, fix the wire harness and ensure that the holes are sealed and waterproof, and use bolts to fix the control circuit board in the inner cavity of the electronic control end cover 501. Place the annular sealing gasket 505 into the preset annular sealing groove on the electronic control end cover 501 (or place it on the end face of the sealing retainer ring 402 of the rear end cover assembly 400).

[0080] d. Connection between the electronically controlled cover assembly 500 and the rear cover assembly 400 and / or the drive motor body 100:

[0081] d1. Align the elastic buckle block on the electronic control cover assembly with the insertion section of the rotating buckle groove 403 on the rear cover assembly, and push the electronic control end cover 501 toward the rear cover of the motor along the axial direction. At the same time, ensure that the electrical pins / sockets on the control circuit board are precisely aligned with and inserted into the electrical interface corresponding to the rear end of the drive motor body 100. During this process, the end protrusion of the elastic buckle block 504 will be squeezed and produce elastic deformation.

[0082] d2. When the electronic control end cover 501 is pushed all the way down, the interface of the control circuit board 502 is fully engaged, and the end of the elastic latch block 504 passes the end of the insertion section of the rotating latch groove 403, rotate the electronic control end cover 501 by a certain angle (usually less than 90 degrees). The rotation causes the protrusion at the end of the elastic latch block to slide into the locking section of the rotating latch groove. At this time, the elastic latch block 504 recovers its elasticity, and its protrusion is firmly locked at the end of the locking section, thus firmly locking the electronic control cover assembly 500 onto the rear cover assembly 400.

[0083] During this locking process, the annular sealing gasket 505 is axially compressed between the electronic control end cover 501 and the sealing retainer ring 402, forming a tight sealing ring that effectively prevents moisture and dust from entering the electronic control end cover 501 and corroding the control circuit board 502.

[0084] At this point, after assembly, the drive motor forms a complete dedicated drive module for the electric tailgate strut, integrating a reduction mechanism, lubrication structure, and electronic control unit. During operation, the body controller sends commands to the control circuit board via the wiring harness. The control circuit board drives the drive motor to rotate, and the motor power is input to the planetary gear reduction mechanism through the sun gear 311. After reduction and torque amplification, the power is output through the planetary carrier 312 and the output spline shaft 313, driving the screw mechanism of the electric strut to achieve the raising and lowering of the tailgate.

[0085] Throughout the entire operation, the lubrication structure integrated within the reduction gear assembly 300 continuously and stably provides lubrication to the meshing surfaces of the high-speed planetary gears, significantly reducing wear, noise, and temperature rise, and greatly improving the reliability and service life of the transmission system. Meanwhile, the sealed design of the electronic control cover assembly 500 ensures the long-term stable operation of the control unit in harsh vehicle environments.

[0086] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A motor for rotating a tailgate of an automobile, characterized by: include The drive motor body (100), the reduction gear assembly (300), the rear end cover assembly (400), and the electronic control cover assembly (500) are included. The reduction gear assembly (300) integrates a lubrication structure, including: The gearbox housing (301) has its inner cavity divided into a gear transmission cavity (303) and an oil storage cavity (304) by a cavity partition (302); The input shaft sleeve (305) is fixed in the center of the oil reservoir (304) and passes through the cavity partition (302); The lubrication system structure includes: multiple oil seepage pipes (306) arranged in a circumferential array in the oil storage cavity (304), an oil storage cotton core (307) filled in the oil seepage pipes (306), and an oil replenishment hole (308) opened on the peripheral wall of the oil seepage pipes (306); The planetary gear mechanism is located in the gear transmission cavity (303) and includes: an internal gear ring (310) fixed to the inner wall of the gear transmission cavity (303), a sun gear (311) connected to the output shaft of the drive motor body (100), a planet carrier (312) rotatably connected to the bottom of the gear transmission cavity (303), an output spline shaft (313) fixed to the bottom of the planet carrier (312), and a planet gear (314) mounted on the planet carrier (312) and meshing with the sun gear (311) and the internal gear ring (310); The lubricating oil in the oil storage chamber (304) seeps into the oil storage cotton core (307) through the oil replenishment hole (308) and is continuously supplied to the meshing surface of the planetary gear through centrifugal force. The rear end cover assembly (400) is fixed to the non-output end of the drive motor body (100); The electronically controlled cover assembly (500) is detachably mounted on the rear cover assembly (400).

2. The automobile tailgate rotating motor according to claim 1, characterized in that: The planetary carrier (312) is fixed coaxially with the output spline shaft (313). The centrifugal force generated when the planetary gear (314) revolves drives the lubricating oil in the oil seepage pipe (306) to be thrown radially towards the gear meshing area, forming a self-sustaining oil film.

3. The automobile tailgate rotating motor according to claim 1, characterized in that: The gearbox (301) and the drive motor body (100) are connected by a snap-fit ​​structure, which includes: A mounting screw hole (200) is formed on the circumference of the drive motor body (100) housing; an elastic mounting hook (309) is fixed to the opening end of the gearbox body (301), and its hook part is deformed and then inserted into the mounting screw hole (200) to achieve axial locking.

4. The automobile tail gate rotating motor according to claim 1, characterized by: The rear cover assembly (400) includes: The motor rear end cover (401) has a hole in its central area through which the motor shaft passes, and is fixedly connected to the rear end housing of the drive motor body (100) by screws or clips at its edge position to seal the rear end of the motor and provide an electrical interface base; the sealing ring (402) is fixedly connected to the outer edge of the motor rear end cover (401) to form a raised annular wall; the rotating snap groove (403) is set on the end face or side wall of the sealing ring (402), and has multiple "L"-shaped grooves evenly opened along the circumferential direction, wherein each groove consists of an insertion section and a locking section, which are used to cooperate with the elastic snap block (504) on the electric control cover assembly (500) to achieve a quick rotation locking connection.

5. The automobile tail gate rotating motor according to claim 1 or 4, characterized by: The electronically controlled cover assembly (500) includes: An electric control end cover (501) is installed on one side of the motor rear end cover (401), and its cross-sectional structure is adapted to the cross-sectional structure of the sealing ring (402); a control circuit board (502) is fixedly installed in the inner cavity of the electric control end cover (501); a cable sealing hole (503) is opened on the side wall of the electric control end cover (501) for leading out the power line and signal harness connecting the control circuit board (502); and elastic buckle blocks (504) are fixedly connected to the electric control end cover at equal intervals. (501) has an inner wall edge and a protrusion or hook structure at its end; an annular sealing gasket (505) with an O-type or D-type cross-section is fixedly installed on the mating surface of the electric control end cover (501) and the motor rear end cover (401) and / or the sealing ring (402). When the electric control cover assembly is installed in place, the annular sealing gasket (505) is compressed between the electric control end cover (501) and the sealing ring (402) to form a reliable radial and / or end face seal.

6. The automobile tailgate rotating motor according to claim 1, characterized in that: The oil seepage pipe (306) has its axis parallel to the input shaft sleeve (305), and one end of it is fixed to the cavity partition (302) and close to the inner wall of the gearbox (301), while the other end extends to the closed end of the oil storage cavity (304). The oil storage cotton core (307) is made of highly absorbent composite fiber cotton, and its capillary adsorption effect allows the lubricating oil to be slowly released to the end of the oil seepage pipe (306) near the gear transmission cavity (303).

7. The automobile tail gate rotating motor according to claim 1, characterized by: The input shaft sleeve (305) is press-fitted with the cavity partition (302), and a rotating sealing ring is provided in its inner hole to isolate the lubricating oil.

8. The automobile tail gate rotating motor according to claim 5, characterized by: The control circuit board (502) integrates an electrically interconnected motor drive chip, microcontroller, position feedback circuit, communication interface and overload protection circuit, and is connected to the electrical interface of the drive motor body (100) via pins.

9. The automobile tail gate rotating motor according to claim 1 or 6, characterized by: The volume of the oil storage chamber (304) is greater than the total volume of the oil seepage pipe (306) to form a lubricating oil storage space.

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