Automobile tailgate gear box

Abstract

The utility model provides a kind of automobile tail door gear box, including motor, base, primary transmission component, secondary transmission component and output frame, base is set on motor, upper cover is set on base, secondary transmission component and primary transmission component are set on base upside and downside, output frame is set on the end of upper cover away from motor, motor passes through primary transmission component and secondary transmission component and power is transmitted to output frame, primary transmission component includes planet carrier, driving tooth and primary planetary tooth, planet carrier includes integrally formed frame body and connecting column, primary planetary tooth is set on connecting column, driving tooth is set on the drive shaft of motor, driving tooth is respectively connected with primary planetary tooth and the inner tooth portion transmission connection of upper cover, primary planetary tooth is provided with first center hole and oil groove, oil groove is communicated with first center hole, connecting column is inserted in first center hole;The utility model has the advantages of low cost, easy to install and long service life.

Description

Technical Field

[0001] This utility model relates to the field of gearboxes, specifically to a tailgate gearbox for automobiles. Background Technology

[0002] The tailgate gearbox is a core component of the electric tailgate system. Its main function is to convert the high-speed, low-torque motor into low-speed, high-torque operation, driving the smooth opening and closing of the tailgate. With the continuous improvement of automotive intelligence, electric tailgates have become standard equipment in many models. While meeting the performance requirements of the gearbox, cost control has become increasingly important; therefore, using plastic parts has become a key way to reduce costs. However, in practical applications, severe wear often occurs when plastic planetary carriers and plastic gears are used together, affecting the overall lifespan of the gearbox. Furthermore, the precision and cost of existing tailgate gearboxes still need further optimization. Utility Model Content

[0003] The purpose of this invention is to provide a low-cost, easy-to-install, and long-life automotive tailgate gearbox.

[0004] To achieve the above objectives, this utility model provides a car tailgate gearbox, including a motor, a base, a top cover, a primary transmission assembly, a secondary transmission assembly, and an output frame. The base is mounted on the motor, the top cover is mounted on the base, the secondary transmission assembly and the primary transmission assembly are mounted vertically on the base, and the output frame is mounted on the end of the top cover away from the motor. The motor transmits power to the output frame through the primary and secondary transmission assemblies. The primary transmission assembly includes a planetary carrier, a drive gear, and a primary planetary gear. The planetary carrier includes an integrally formed frame and a connecting column. The primary planetary gear is mounted on the connecting column, and the drive gear is mounted on the drive shaft of the motor. The drive gear is connected to the primary planetary gear and the inner tooth portion of the top cover. The primary planetary gear has a first central hole and an oil groove, the oil groove communicating with the first central hole. The connecting column is rotatably inserted into the first central hole.

[0005] As can be seen from the above solution, by setting up an oil groove, some lubricating oil can be stored, preventing the lubricating oil from being squeezed out during the relative rotation of the connecting column and the first central hole. This ensures that the first central hole retains sufficient lubricating oil for a long time, effectively reducing wear between the two and thus extending the overall service life of the gearbox. Furthermore, by using an integrally molded frame and connecting column, the potential loosening problem of the connecting column is avoided, which not only improves the overall reliability of the gearbox but also reduces assembly difficulty. This utility model also has the advantages of simple structure and low production cost.

[0006] A further option is that the oil groove is recessed into the wall of the first central hole, and the oil groove extends a predetermined distance along the axial direction of the first central hole.

[0007] A further solution is to install an oil-cutting surface inside the oil tank.

[0008] As can be seen from the above scheme, by setting an oil-blocking surface, lubricating oil can be effectively trapped and prevented from leaking downwards.

[0009] A further option is that the planetary carrier also includes a secondary drive unit, with the secondary drive unit and connecting column respectively located on both sides of the carrier body. The secondary drive unit, carrier body, and connecting column are integrally formed, and a boss is provided on the carrier body, with the boss located on the outside of the secondary drive unit.

[0010] As can be seen from the above scheme, by setting the boss part, on the one hand, the structural strength of the planetary carrier is enhanced, effectively preventing the displacement of the connecting column due to deformation; on the other hand, the contact area between the secondary transmission component and the carrier surface is reduced, thereby reducing friction and improving transmission efficiency.

[0011] A further design involves providing a positioning hole in the planetary carrier, through which the motor's drive shaft passes and is inserted, thus positioning itself within the hole.

[0012] As can be seen from the above solution, the planetary carrier can be quickly and accurately positioned during the assembly process by the positioning fit between the drive shaft and the positioning hole. This not only effectively reduces the difficulty of automated assembly and improves assembly efficiency, but also avoids the problem of damage to the first-stage planetary teeth due to positioning deviation.

[0013] A further embodiment is that the secondary transmission assembly includes secondary planetary gears and a pin. The secondary planetary gears are connected to the output frame via the pin, and the secondary planetary gears are respectively connected to the secondary drive unit and the inner gear of the upper cover. The secondary planetary gears and / or the pin correspond vertically to the boss.

[0014] A further design includes an installation hole in the top cover, a sliding bearing inside the installation hole, and an annular flange at one end of the sliding bearing; the output frame includes an output section and a main body, the secondary transmission assembly is connected to the main body, the output section is inserted into the sliding bearing, and the main body is adjacent to or in contact with the annular flange.

[0015] As can be seen from the above scheme, by making the body adjacent to or in contact with the annular flange, the annular flange can directly rotate relative to the surface of the body through friction when the output frame rotates. This structure eliminates the need for additional shims between the sliding bearing and the body, reduces the number of parts, and thus effectively reduces costs.

[0016] A further solution is to have a snap-fit ​​structure between the top cover and the base.

[0017] A further option is that the snap-fit ​​structure includes a slot and a platform that mate and connect, with one slot and platform located on the top cover and the other on the base.

[0018] As can be seen from the above scheme, the above settings can effectively prevent the top cover from rotating and ensure the reliability of the gearbox transmission.

[0019] A further option is to provide a positioning and mating structure between the base and the motor. The positioning and mating structure includes a protruding post and a socket that are connected in a mating manner. One of the protruding post and the socket is located on the base, and the other is located on the motor.

[0020] As can be seen from the above scheme, the above settings facilitate precise positioning of the base during assembly, effectively reducing the difficulty of automated assembly and improving assembly efficiency. Attached Figure Description

[0021] Figure 1 This is a structural diagram of an embodiment of the present utility model.

[0022] Figure 2 This is an exploded view of an embodiment of the present invention.

[0023] Figure 3 This is a cross-sectional view of an embodiment of the present utility model.

[0024] Figure 4 This is a structural diagram of the upper cover in an embodiment of this utility model.

[0025] Figure 5 This is a structural diagram of the first-stage transmission component in this embodiment of the utility model, omitting the planetary carrier.

[0026] Figure 6 This is a structural diagram of the planetary carrier from a first-view perspective in an embodiment of this utility model.

[0027] Figure 7 This is a structural diagram of the planetary carrier from a second perspective in an embodiment of this utility model.

[0028] Figure 8 This is a structural diagram of the output frame and sliding bearing in an embodiment of this utility model.

[0029] Figure 9 This is an exploded view of the output frame and sliding bearing in an embodiment of this utility model.

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0031] See Figures 1 to 4 The embodiment provides a car tailgate gearbox, including a motor 1, a base 2, a top cover 6, a primary transmission assembly 3, a secondary transmission assembly 4, and an output frame 5.

[0032] The base 2 is mounted on the motor 1. A positioning and fitting structure is provided between the base 2 and the motor 1. The positioning and fitting structure includes a protruding post 21 and a socket 11 that fit together. One of the protruding post 21 and the socket 11 is located on the base 2, and the other is located on the motor 1. Specifically, protruding posts 21 are respectively provided on both sides of the bottom wall of the base 2, and two first locking holes 22 are also provided on the base 2. The motor 1 has two sockets 11 and two second locking holes 12. The protruding posts 21 are inserted into the corresponding sockets 11. The base 2 is also fixed to the motor 1 by two screws, which pass through the first locking holes 22 and are connected to the corresponding second locking holes 12.

[0033] The upper cover 6 is mounted on the base 2, and its inner wall has internal teeth 61. A snap-fit ​​structure is provided between the upper cover 6 and the base 2. The snap-fit ​​structure includes a slot 62 and a platform 23 that fit together, with one slot 62 and platform 23 located on the upper cover 6 and the other on the base 2. Specifically, four platforms 23 are evenly spaced on the outer peripheral wall of the base 2; four slots 62 are correspondingly provided on the inner side of the upper cover 6, with downward-facing openings in the slots 62, allowing the upper cover 6 to be assembled onto the base 2 in the vertical direction. The platforms 23 are located within the slots 62 to restrict the rotation of the upper cover 6. The upper cover 6 is also fixed to the base 2 by four screws, which pass through the upper cover 6 and connect to the base 2.

[0034] The secondary transmission assembly 4 and the primary transmission assembly 3 are mounted on the base 2 and inside the upper cover 6. The output frame 5 is mounted on the end of the upper cover 6 away from the motor 1. The motor 1 transmits power to the output frame 5 through the primary transmission assembly 3 and the secondary transmission assembly 4.

[0035] See Figures 5 to 7 and combined Figure 2 and Figure 3 The primary transmission component 3 includes a planet carrier 31, a drive gear 32, and several primary planetary gears 33. In this embodiment, three primary planetary gears 33 are used as an example. The three primary planetary gears 33 are arranged in a triangle around the outer periphery of the drive gear 32.

[0036] The drive shaft 13 of the motor 1 extends through the base 2 toward the planetary carrier 31, and the drive gear 32 is mounted on the drive shaft 13 of the motor 1, which can drive the drive gear 32 to rotate.

[0037] The planetary carrier 31 includes an integrally formed frame 311, a secondary drive unit 312, and three connecting posts 313. The three connecting posts 313 are arranged in a triangle on the first side of the frame 311, and the secondary drive unit 312 is located in the middle of the second side of the frame 311. The primary planetary gears 33 are sleeved on the outside of the corresponding connecting posts 313. The driving gears 32 are respectively connected to the primary planetary gears 33 and the inner teeth 61 of the upper cover 6, so that while the driving gears 32 drive the primary planetary gears 33 to rotate, the primary planetary gears 33 also revolve around the sun, thereby driving the planetary carrier 31 to rotate.

[0038] In this embodiment, both the primary planetary gear 33 and the planetary carrier 31 are made of plastic material, preferably glass fiber reinforced plastic, which ensures high strength while reducing production costs. The primary planetary gear 33 has a first central hole 331 and several oil grooves 332. The number and size of the oil grooves 332 can be determined according to the diameter of the first central hole 331. In this embodiment, three oil grooves 332 are arranged evenly at intervals along the circumference of the first central hole 331. The oil grooves 332 are recessed into the wall of the first central hole 331 and communicate with the first central hole 331. The connecting post 313 is rotatably inserted into the first central hole 331.

[0039] In this embodiment, an oil groove 332 is provided in the first central hole 331 to store some lubricating oil, so as to ensure that the connecting column 313 and the first central hole 331 can maintain sufficient lubrication for a long time. This structure can effectively prevent the first-stage planetary gear 33 from completely squeezing out the lubricating oil in the first central hole 331 during rotation, thereby reducing wear on both, improving motion reliability, and extending the service life of the gearbox.

[0040] To ensure that the lubricating oil does not leak, the oil groove 332 in this embodiment extends a predetermined distance along the axial direction of the first central hole 331. This predetermined distance is less than the length of the first central hole 331, so that an oil-cutting surface is formed in the oil groove 332. The oil-cutting surface is perpendicular to the axial direction of the first central hole 331, which is used to cut off more lubricating oil without affecting the lubricating oil to wet the peripheral wall of the connecting column 313.

[0041] In this embodiment, the secondary drive unit 312, the frame 311, and the connecting column 313 are integrally formed.

[0042] The frame 311 is provided with a boss 314, which protrudes from the upper surface of the frame 311 and is coaxially disposed on the outside of the secondary drive unit 312.

[0043] The planetary carrier 31 is also provided with a positioning hole 315 in the middle. The positioning hole 315 extends upward from the bottom wall of the carrier 311 into the secondary drive unit 312, and the positioning hole 315 and the secondary drive unit 312 are coaxially arranged at the center of the circle where the three connecting columns 313 are located.

[0044] The drive shaft 13 of the motor 1 is inserted into the positioning hole 315 and positioned therewith. The drive shaft 13 and the planet carrier 31 can rotate relative to each other, which facilitates the assembly of the planet carrier 31 and can accurately position the planet carrier 31 to avoid positional deviation.

[0045] See Figure 8 and Figure 9 and combined Figure 2 and Figure 3 The secondary transmission assembly 4 is mounted on the primary transmission assembly 3. The secondary transmission assembly 4 includes four secondary planetary gears 41 and four pins 42. The four secondary planetary gears 41 are respectively located on the outer periphery of the secondary drive unit 312. Each secondary planetary gear 41 is connected to the output frame 5 through a corresponding pin 42, and the secondary planetary gears 41 are respectively connected to the secondary drive unit 312 and the inner gear part 61 of the upper cover 6. This allows the secondary drive unit 312 to drive the four secondary planetary gears 41 to rotate on their own axis while the secondary planetary gears 41 revolve around the central axis, thereby driving the output frame 5 to rotate.

[0046] The secondary planetary gear 41 and / or the pin 42 correspond vertically to the boss portion 314. Even if the secondary planetary gear 41 and / or the pin 42 are in contact with the surface of the boss portion 314, the contact area is small, which helps to reduce friction, ensure smooth rotation, and ensure the reliable operation of the gearbox.

[0047] The upper part of the cover 6 has a mounting hole 63, and a sliding bearing 7 is installed in the mounting hole 63. The lower end of the sliding bearing 7 is provided with an annular flange 71, which protrudes from the outer peripheral wall of the sliding bearing 7.

[0048] The output frame 5 includes an integrally formed output part 51 and a body 52. ​​The output part 51 is used to be fixedly connected to the drive shaft of the peripheral device.

[0049] The secondary transmission assembly 4 is connected to the main body 52, and one end of the pin 42 is fixed to the main body 52. ​​The output part 51 is inserted into the sliding bearing 7, and the output part 51 can rotate smoothly relative to the upper cover 6. The upper surface of the main body 52 is adjacent to or in contact with the bottom wall of the sliding bearing 7 and / or the bottom wall of the annular flange 71. No additional shims are required between the sliding bearing 7 and the main body 52, which helps to reduce the number of parts and lower production costs.

[0050] The inner wall of the mounting hole 63 is provided with a stepped hole, and the annular flange 71 is provided in the stepped hole to prevent the output frame 5 from detaching from the upper cover 6.

[0051] The outer side of the output section 51 is fitted with a retaining ring 8 and a shock-absorbing washer 9. Both the retaining ring 8 and the shock-absorbing washer 9 are located on the top wall of the upper cover 6, and the shock-absorbing washer 9 is located below the retaining ring 8. The retaining ring 8 is used to prevent the shock-absorbing washer 9 from accidentally coming off.

[0052] The second center hole of the second-stage planetary gear 41 may also have several oil grooves (not shown in the figure), and the number and size of the oil grooves can be determined according to the diameter of the second center hole.

[0053] The working principle of this embodiment is as follows: the motor 1 drives the active gear 32 to rotate through the drive shaft 13, and the active gear 32 drives the three primary planetary gears 33 to rotate. Since the primary planetary gears 33 are also connected to the inner gear part 61 of the upper cover 6, the primary planetary gears 33 rotate and revolve at the same time, thereby driving the planet carrier 31 to rotate. The planet carrier 31 drives the four secondary planetary gears 41 to rotate through the secondary drive part 312. Since the secondary planetary gears 41 are connected to the inner gear part 61 of the upper cover 6, the secondary planetary gears 41 rotate and revolve at the same time, thereby driving the output frame 5 to rotate.

[0054] In summary, this invention, by providing an oil groove 332, can store a portion of the lubricating oil, preventing it from being squeezed out during the relative rotation of the connecting column 313 and the first central hole 331. This ensures that the first central hole 331 retains sufficient lubricating oil over a long period, effectively reducing wear between the two and extending the overall service life of the gearbox. Furthermore, by using an integrally molded frame 311 and connecting column 313, potential loosening of the connecting column 313 is avoided, improving the overall reliability of the gearbox and reducing assembly difficulty. This invention also has the advantages of simple structure and low production cost.

[0055] Finally, it should be emphasized that the above are only preferred embodiments of this utility model and are not intended to limit this utility model. For those skilled in the art, this utility model can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tailgate gearbox for automobiles, comprising a motor, a base, a top cover, a primary transmission assembly, a secondary transmission assembly, and an output frame, wherein the base is disposed on the motor, the top cover is disposed on the base, the secondary transmission assembly and the primary transmission assembly are disposed vertically on the base, and the output frame is disposed on the end of the top cover away from the motor, and the motor transmits power to the output frame through the primary transmission assembly and the secondary transmission assembly, characterized in that: The primary transmission assembly includes a planetary carrier, a drive gear, and a primary planetary gear. The planetary carrier includes an integrally formed frame and a connecting post. The primary planetary gear is disposed on the connecting post. The drive gear is disposed on the drive shaft of the motor. The drive gear is connected to the primary planetary gear and the inner tooth portion of the upper cover for transmission. The primary planetary gear has a first central hole and an oil groove. The oil groove communicates with the first central hole. The connecting post is rotatably inserted into the first central hole.

2. The automotive tailgate gearbox according to claim 1, characterized in that: The oil groove is recessed into the wall of the first central hole, and the oil groove extends a predetermined distance along the axial direction of the first central hole.

3. The automotive tailgate gearbox according to claim 2, characterized in that: An oil-cutting surface is provided inside the oil tank.

4. The automotive tailgate gearbox according to claim 1, characterized in that: The planetary carrier also includes a secondary drive unit. The secondary drive unit and the connecting column are respectively disposed on both sides of the carrier body. The secondary drive unit, the carrier body and the connecting column are integrally formed. The carrier body is provided with a boss portion, which is disposed on the outside of the secondary drive unit.

5. The automotive tailgate gearbox according to claim 4, characterized in that: The planetary carrier is also provided with a positioning hole, and the drive shaft of the motor passes through the base and is inserted into the positioning hole, and is positioned and engaged with the positioning hole.

6. The automotive tailgate gearbox according to claim 4, characterized in that: The secondary transmission assembly includes a secondary planetary gear and a pin. The secondary planetary gear is connected to the output frame through the pin, and the secondary planetary gear is respectively connected to the secondary drive unit and the inner toothed part of the upper cover. The secondary planetary gear and / or the pin correspond vertically to the boss part.

7. The automotive tailgate gearbox according to claim 1, characterized in that: The upper cover has a mounting hole, and a sliding bearing is installed in the mounting hole. One end of the sliding bearing is provided with an annular flange. The output frame includes an output section and a body. The secondary transmission assembly is connected to the body. The output section is inserted into the sliding bearing. The body is adjacent to or in contact with the annular flange.

8. The automotive tailgate gearbox according to claim 1, characterized in that: A snap-fit ​​structure is provided between the top cover and the base.

9. The automotive tailgate gearbox according to claim 8, characterized in that: The snap-fit ​​structure includes a slot and a platform that are connected in a mating manner. One of the slot and the platform is disposed on the upper cover, and the other is disposed on the base.

10. The automotive tailgate gearbox according to claim 1, characterized in that: A positioning and fitting structure is provided between the base and the motor. The positioning and fitting structure includes a protruding post and a socket that are connected in a fitting manner. One of the protruding post and the socket is provided on the base, and the other is provided on the motor.

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