Coaxial automobile tailboard lifting structure
By adopting a coaxial vehicle tail plate lifting structure in the electric vehicle tail plate, the same drive motor and connecting shaft are used to achieve synchronous action of the two lifting push rods, the problem of out-of-synchronization of push rods in the existing technology is solved, and the effect of simple structure, low cost and smooth lifting process is achieved.
Patent Information
- Application Number
- CN202422040310.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-08-22
AI Technical Summary
In the tail plate of existing electric vehicles, the movements of the two lifting push rods are easily out of synchronization, resulting in high control difficulty and increased cost, and complex wiring and not simple structure.
The coaxial vehicle tail plate lifting structure is adopted, and the two lifting push rods are driven by the same drive motor and connected by the connecting shaft, so that the action of one lifting push rod can synchronously drive the action of the other lifting push rod, forming a synchronously driven lift push rod group.
The synchronous action of the two lifting push rods is achieved, which reduces manufacturing and use costs, simplifies wiring and structural design, ensures the stability of the lifting process, and is conducive to the use of electric lifting tail plates.
Smart Images
Figure CN222946630U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of automobile auxiliary parts, in particular to a coaxial automobile tailgate lifting structure. Background Art
[0002] With the development of the logistics industry and the development of automated equipment, tailgates are gradually being used on freight trucks to assist in loading and unloading goods and reduce the burden of manual handling.
[0003] In addition, with the development of electric equipment, electric vehicle tailboards use electric push rods as the power structure of the tailboard action, thereby solving the problems of complex pipe layout, oil leakage and oil freezing after long-term use of the existing car tailboards using hydraulic cylinders as the power structure. In addition, the existing electric vehicle tailboards using electric push rods as the power structure only need simple and small cables to realize power supply, which is convenient for wiring, simple in structure and easy to maintain. In addition, the energy used is clean and pollution-free, meeting the needs of large-scale promotion and use.
[0004] At present, the existing electric vehicle tailboards on the market are usually automobile tailboards using electric push rods as disclosed in patent CN117246217A, which include a tailboard main beam and a bearing platform. The bearing platform and the tailboard main beam are hingedly connected with two fixed-length rods through two flip push rods. The two flip push rods are located on the outsides of the two fixed-length rods. A lifting push rod for driving the bearing platform to rise and fall is hinged on the fixed-length rods. The lifting push rod is located below the fixed-length rods. In addition, the lifting push rod includes a lifting appearance and a lifting telescopic tube. A first motor is arranged on the lifting outer tube and is connected to the lifting appearance through a lifting reduction box. Similarly, the flip push rods The push rod includes a flip outer tube and a flip telescopic tube. The flip outer tube is provided with a second motor. The second motor is connected to the inner end of the flip outer tube through a flip reduction gearbox. It can be seen that in the existing electric vehicle tailgate, whether it is a flip drive structure or a lifting drive structure, it is realized by two relatively arranged electric push rods, and each electric push rod is independently configured with a corresponding motor, which is not only costly and complicated in wiring, but also prone to the problem of asynchronous movement of the two electric push rods. Even if a synchronization control structure is added, there are still problems of greater control difficulty and increased cost, which is not conducive to the use of the electric lifting tailgate. Summary of the invention
[0005] In view of the above-mentioned problems existing in the prior art, the present invention aims to provide a coaxial automobile tailgate lifting structure, in which two relatively arranged lifting push rods adopt the same driving motor driver, and the two lifting push rods are connected by a connecting shaft, so that when the driving motor drives one lifting push rod to move, it can also synchronously drive the other lifting push rod to move through the connecting shaft. The two lifting push rods form a lifting push rod group driven synchronously by the driving motor. Not only is the structure simple, the wiring is simplified, and the manufacturing cost is reduced, but also the synchronous movement of the two lifting push rods can be ensured. There is no need to set up an additional control structure, thereby ensuring the smoothness of the lifting process and facilitating the use of the electric lifting tailgate.
[0006] The specific technical solutions are as follows:
[0007] A coaxial automobile tailgate lifting structure includes two lifting push rods, which are respectively a main push rod and a secondary push rod and are arranged at intervals on both sides of a platform plate. It has the following characteristics and also includes a drive motor, a main gear box, a secondary gear box and a connecting shaft. The main push rod and the secondary push rod are respectively equipped with a main gear box and a secondary gear box. The drive motor is installed on the main gear box and is connected to the input shaft of the main gear box in terms of power. In addition, the other end of the input shaft of the main gear box extends outside the main gear box to form a secondary drive shaft. The connecting shaft is arranged between the main gear box and the secondary gear box, and the two ends of the connecting shaft are respectively connected to the input shaft of the secondary gear box and the secondary drive shaft.
[0008] In the above-mentioned coaxial automobile tailgate lifting structure, couplings are arranged between the connecting shaft and the input shaft of the secondary gear and the secondary drive shaft, and the couplings are all universal joint couplings.
[0009] The above-mentioned coaxial automobile tailgate lifting structure, wherein the main push rod and the auxiliary push rod both include an outer tube, an inner tube and a screw pair, the inner tube is slidably arranged in the outer tube and circumferentially limited to each other, one end of the outer tube is installed on the corresponding main gear box or auxiliary gear box, one end of the inner tube extends from the end of the outer tube away from the main gear box or auxiliary gear box, the screw pair is installed in the inner tube, the nut of the screw pair is fixed in the inner tube, the screw of the screw pair is threadedly connected with the nut and one end extends into the corresponding main gear box or auxiliary gear box.
[0010] The above-mentioned coaxial automobile tailgate lifting structure, wherein the main gearbox and the auxiliary gearbox both include a box body, a power input shaft, a duplex gear and an output gear, the box body is installed on the outer tube of the corresponding main push rod or auxiliary push rod, the power input shaft is rotatably installed on the box body, the duplex gear is rotatably installed in the box body and a gear is dynamically connected to the power input shaft, the output gear is installed on the corresponding main push rod or auxiliary push rod and extends to the corresponding main gearbox or auxiliary gearbox on the screw, and the other gear of the duplex gear is meshed with the output gear.
[0011] In the above-mentioned coaxial automobile tailgate lifting structure, a worm thread is arranged in the middle of the power input shaft, and the gear connected with the power input shaft by the double gear is a worm gear.
[0012] The above-mentioned coaxial automobile tailgate lifting structure, wherein one end of the power input shaft of the main gearbox is connected to the main shaft of the drive motor, and the other end extends out of the corresponding box body to form a connection between the auxiliary drive shaft and one end of the connecting shaft, and one end of the power input shaft of the auxiliary gearbox extends out of the box body and is connected to the other end of the connecting shaft.
[0013] In the above-mentioned coaxial automobile tailgate lifting structure, a deep groove ball bearing and an angular contact bearing are arranged between the screw of the screw pair and the housing of the corresponding main gear box or auxiliary gear box, and a thrust bearing is also arranged between the screw and the housing.
[0014] The above-mentioned coaxial automobile tailgate lifting structure, wherein a front end cover component is arranged between one end of the inner tube extending out of the outer tube and the outer tube, and the front end cover component includes an end cover body, an anti-sway inner ring, an inner sealing ring, an outer sealing ring, a scraper ring, a pressure plate and a locking screw. The end cover body is sleeved on the outside of the inner tube and the lower end is inserted into the outer tube. The anti-sway inner ring is sleeved on the outside of the inner tube and is located in the lower end of the end cover body. At the same time, the inner sealing ring and the outer sealing ring are both installed on the inner wall of the end cover body and sleeved on the outside of the inner tube. The scraper ring is sleeved on the outside of the inner tube and fixedly installed in the upper end of the end cover body. The pressure plate is sleeved on the outside of the inner tube and is installed on the upper end surface of the end cover body through the locking screw, and the pressure plate presses the scraper ring.
[0015] The positive effects of the above technical solution are:
[0016] The above-mentioned coaxial automobile tailgate lifting structure is achieved by respectively arranging a main gear box and a sub-gear box on the main push rod and the sub-push rod, and a driving motor is installed on the main gear box and connected to one end of its input shaft, and the other end of the input shaft of the main gear box is extended to form a sub-drive shaft, and the sub-drive shaft and the input shaft of the sub-gear box are connected by a connecting shaft, thereby ensuring that the driving motor can not only directly drive the main push rod to move through the main gear box, but also synchronously drive the sub-push rod to move through the connecting shaft and the sub-gear box, thereby achieving the purpose of the same driving motor driving the main push rod and the sub-push rod to move synchronously at the same time. Not only is the structure simple, convenient for wiring, installation and maintenance, and reduces the manufacturing and use costs, but also the main push rod and the sub-push rod can achieve synchronous movement without setting up an additional control structure, thereby ensuring the stability of the lifting process and facilitating the use of the electric lifting tailgate. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is an installation structure diagram of a coaxial automobile tailgate lifting structure of the utility model;
[0018] Figure 2This is a structural diagram of a coaxial automobile tailgate lifting structure of the utility model;
[0019] Figure 3 This is a structural diagram of a main push rod and a main gear box in a preferred embodiment of the utility model;
[0020] Figure 4 A cross-sectional view of a main push rod and a main gear box of a preferred embodiment of the utility model;
[0021] Figure 5 A cross-sectional view of a main gearbox of a preferred embodiment of the utility model;
[0022] Figure 6 This is an internal structure diagram of a main gearbox of a preferred embodiment of the utility model;
[0023] Figure 7 It is a cross-sectional view of a front end cover component of a preferred embodiment of the utility model.
[0024] In the accompanying drawings: 1. main push rod; 11. outer tube; 12. inner tube; 13. screw pair; 14. front end cover component; 131. nut; 132. screw; 133. deep groove ball bearing; 134. angular contact bearing; 135. thrust bearing; 141. end cover body; 142. anti-sway inner ring; 143. inner sealing ring; 144. outer sealing ring; 145. scraper ring; 146. pressure plate; 147. locking screw; 2. auxiliary push rod; 3. drive motor; 4. main gear box; 41. box body; 42. power input shaft; 43. duplex gear; 44. output gear; 421. auxiliary drive shaft; 5. auxiliary gear box; 6. connecting shaft; 7. coupling. DETAILED DESCRIPTION
[0025] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the following embodiments are combined with the attached Figure 1 To Attachment Figure 7 The technical solution provided by the utility model is described in detail, but the following content is not intended to limit the utility model.
[0026] Figure 1 This is an installation structure diagram of a coaxial automobile tailgate lifting structure of the utility model; Figure 2 This is a structural diagram of a coaxial automobile tailgate lifting structure of the utility model. Figure 1 and Figure 2 As shown, the coaxial automobile tailgate lifting structure provided in this embodiment includes two lifting push rods arranged on both sides of the platform plate. At this time, the two lifting push rods are defined as a main push rod 1 and an auxiliary push rod 2, respectively, to ensure that the forces on both sides of the platform plate are balanced, thereby achieving stable lifting of the platform plate. In addition, the coaxial automobile tailgate lifting structure provided in this embodiment also includes a driving motor 3, a main gear box 4, an auxiliary gear box 5 and a connecting shaft 6.
[0027] Specifically, the main push rod 1 and the auxiliary push rod 2 are respectively installed with a main gear box 4 and a auxiliary gear box 5, realizing the self-contained reduction structure of the main push rod 1 and the auxiliary push rod 2, and the drive motor 3 is installed on the main gear box 4 and connected to the input shaft power of the main gear box 4, so that the drive motor 3 can directly input power through the input shaft of the main gear box 4 to realize direct drive of the main push rod 1, and the other end of the input shaft of the main gear box 4 extends to the outside of the main gear box 4 to form a secondary drive shaft 421, which provides conditions for the subsequent power connection between the main gear box 4 and the auxiliary gear box 5. In addition, the connecting shaft 6 is arranged between the main gear box 4 and the auxiliary gear box 5, and the two ends of the connecting shaft 6 are respectively connected to the input shaft of the auxiliary gear box 5 and the auxiliary drive shaft 421, so that when the input shaft of the main gear box 4 is driven to rotate by the driving motor 3, it can drive the connecting shaft 6 to rotate through the formed auxiliary drive shaft 421. At the same time, the input shaft of the auxiliary gear box 5 is synchronously driven to rotate through the connecting shaft 6, thereby realizing the synchronous driving of the auxiliary push rod 2, that is, the driving motor 3, the main push rod 1 and the auxiliary push rod 2 are formed into a coaxial lifting push rod group through the connecting shaft 6, so that the purpose of synchronously driving the main push rod 1 and the auxiliary push rod 2 to move by a driving motor 3 is achieved. It not only has a simple structure, convenient wiring, low manufacturing and use costs, but also can ensure that the main push rod 1 and the auxiliary push rod 2 move synchronously, without the need to set up an additional control structure, thereby ensuring the stability of the lifting process, and facilitating the use of the electric lifting tailgate.
[0028] More specifically, a coupling 7 is provided between the connecting shaft 6 and the input shaft of the secondary gear and the secondary drive shaft 421, and the coupling 7 facilitates the connection of the two ends of the connecting shaft 6 with the input shaft of the secondary gear and the secondary drive shaft 421. In addition, the coupling 7 is a universal joint coupling 7, which can adapt to the problem of accidental angle change error of the main push rod 1 and the secondary push rod 2 during the lifting process, and the structure is more flexible, the fault tolerance rate is higher, and the difficulty of manufacturing and assembly is effectively reduced.
[0029] Figure 3 This is a structural diagram of a main push rod and a main gear box in a preferred embodiment of the utility model; Figure 4 This is a cross-sectional view of the main push rod and the main gear box of a preferred embodiment of the utility model. Figures 1 to 4As shown, the main push rod 1 and the auxiliary push rod 2 both include an outer tube 11, an inner tube 12 and a screw pair 13. During installation, the inner tube 12 is slidably arranged in the outer tube 11 and circumferentially limited to each other, which can not only enable the inner tube 12 to perform telescopic movement relative to the outer tube 11, but also prevent the inner tube 12 from rotating in the outer tube 11, thereby providing conditions for the subsequent telescopic movement of the inner tube 12 under the action of the screw pair 13. One end of the outer tube 11 is installed on the corresponding main gear box 4 or auxiliary gear box 5, and one end of the inner tube 12 is extended from the end of the outer tube 11 away from the main gear box 4 or auxiliary gear box 5, thereby providing conditions for subsequent connection with other structures. In addition, the screw pair 13 is installed in the inner tube 12, and the nut 131 of the screw pair 13 is fixed in the inner tube 12. At the same time, the screw 132 of the screw pair 13 is threadedly connected with the nut 131 and one end extends into the corresponding main gear box 4 or auxiliary gear box 5, so that when the screw 132 rotates, the nut 131 cooperating with the screw 132 can move along the axial direction of the screw 132, thereby driving the inner tube 12 to extend and retract in the outer tube 11 to meet the driving requirements.
[0030] Figure 5 A cross-sectional view of a main gearbox of a preferred embodiment of the utility model; Figure 6 This is a diagram of the internal structure of the main gearbox of a preferred embodiment of the utility model. Figures 3 to 6 As shown, the main gearbox 4 and the auxiliary gearbox 5 both include a housing 41, a power input shaft 42, a double gear 43 and an output gear 44. During installation, the housing 41 is installed on the outer tube 11 of the corresponding main push rod 1 or auxiliary push rod 2, so that the main gearbox 4 and the auxiliary gearbox 5 are respectively integrally connected with the main push rod 1 and the auxiliary push rod 2, thereby improving the integrity. In addition, the power input shaft 42 is rotatably installed on the housing 41, and the power input shaft 42 serves as the input shaft of the above-mentioned main gearbox 4 and auxiliary gearbox 5. The double gear 43 is rotatably installed on the housing A gear in 41 is connected to the power input shaft 42 for power transmission between the power input shaft 42 and the double gear 43. The output gear 44 is installed on the corresponding main push rod 1 or the auxiliary push rod 2 and extends to the corresponding main gear box 4 or the auxiliary gear box 5. In addition, the other gear of the double gear 43 is meshed with the output gear 44, so that the double gear 43 can transmit power to the corresponding screw rod 132, that is, the power input shaft 42 drives the screw rod 132, thereby meeting the use requirements of the push rod extension.
[0031] More specifically, a worm thread is provided in the middle portion of the power input shaft 42, and the gear connected to the power input shaft 42 by the double gear 43 is a worm wheel, thereby realizing the worm gear transmission between the power input shaft 42 and the double gear 43, which can not only meet the deceleration requirements and the use requirements of a large reduction ratio, but also change the power transmission direction, thus providing conditions for the subsequent main reduction box and auxiliary reduction box to realize coaxial synchronous motion through the connecting shaft 6.
[0032] More specifically, one end of the power input shaft 42 of the main gearbox 4 is connected to the main shaft of the drive motor 3 to realize power input, and the other end of the power input shaft 42 of the main gearbox 4 extends to the outside of the corresponding box body 41 to form a secondary drive shaft 421 connected to one end of the connecting shaft 6, ensuring that the power of the drive motor 3 is synchronously transmitted to the connecting shaft 6, and one end of the power input shaft 42 of the secondary gearbox 5 extends to the outside of the box body 41 and is connected to the other end of the connecting shaft 6, so that the connecting shaft 6 can connect the power input shafts 42 of the main gearbox 4 and the secondary gearbox 5, so that the power of the drive motor 3 can be synchronously transmitted to the main gearbox 4 and the secondary gearbox 5, thereby ensuring the synchronization of the movement of the two push rods.
[0033] More specifically, a deep groove ball bearing 133 and an angular contact bearing 134 are provided between the screw rod 132 of the screw rod pair 13 and the housing 41 of the corresponding main gear box 4 or the auxiliary gear box 5, and the output gear 44 is located between the deep groove ball bearing 133 and the angular contact bearing 134, and a thrust bearing 135 is also provided between the screw rod 132 and the housing 41. Since the push rod is subjected to pressure or tension during operation, when subjected to pressure, the screw rod 132 transmits the pressure to the housing 41 through the thrust bearing 135, and when subjected to tension, the screw rod 132 withstands the tension through the angular contact bearing 134. Since the automobile tailgate is subjected to pressure more often during actual use, the thrust bearing 135 with a larger bearing capacity is used to withstand the pressure, and the angular contact bearing 134 is used to withstand less tension, thereby reducing the use of the thrust bearing 135 and reducing the manufacturing cost. At the same time, the angular contact bearing 134 can also realize the installation and positioning of the screw rod 132 to ensure the stable installation of the screw rod 132.
[0034] Figure 7 2 is a cross-sectional view of a front end cover component of a preferred embodiment of the utility model. Figure 3 , Figure 4 and Figure 7As shown, a front end cover component 14 is arranged between the end of the inner tube 12 extending out of the outer tube 11 and the outer tube 11, and the front end cover component 14 includes an end cover body 141, an anti-sway inner ring 142, an inner sealing ring 143, an outer sealing ring 144, a scraper ring 145, a pressure plate 146 and a locking screw 147. The end cover body 141 is sleeved outside the inner tube 12 and the lower end is inserted into the outer tube 11, so that the end cover body 141 is installed on the outer tube 11, and can also serve as a structure to support the inner tube 12. The anti-sway inner ring 142 is sleeved outside the inner tube 12 and located inside the lower end of the end cover body 141, restricting the inner tube 12 to prevent the inner tube 12 from swinging. At the same time, the inner sealing ring 143 and the outer sealing ring 144 are both installed on the inner wall of the end cover body 141 and sleeved outside the inner tube 12, so as to achieve sealing between the inner tube 12 and the end cover body 141, and realize waterproof and dustproof. In addition, the scraper ring 145 is sleeved outside the inner tube 12 and fixedly installed inside the upper end of the end cover body 141. A scraper blade is provided at the top of the scraper ring 145 and on the side close to the inner tube 12, which can scrape off the solid matter attached to the inner tube 12 during the extension and contraction time of the inner tube 12, thereby protecting the outer sealing ring 144 and the inner sealing ring 143, thereby ensuring the sealing performance. In addition, the pressure plate 146 is sleeved outside the inner tube 12 and installed on the upper end surface of the end cover body 141 through the locking screw 147, and the pressure plate 146 presses the scraper ring 145, and the scraper ring 145 is fixed through the pressure plate 146, which improves the installation stability and also facilitates the disassembly and assembly of the front end cover component 14. Preferably, one side of the inner sealing ring 143 is pressed against the anti-sway inner ring 142, and one side of the outer sealing ring 144 is pressed against the scraper ring 145, so that the inner sealing ring 143 and the outer sealing ring 144 can be respectively installed into the end cover body 141 from both ends of the end cover body 141, thereby facilitating the installation of the inner sealing ring 143 and the outer sealing ring 144, and the structural design is more reasonable.
[0035] The coaxial automobile tailgate lifting structure provided in this embodiment includes a main push rod 1, an auxiliary push rod 2, a driving motor 3, a main gear box 4, an auxiliary gear box 5 and a connecting shaft 6; by respectively arranging the main push rod 1 and the auxiliary push rod 2 with the main gear box 4, and the main gear box 4 is provided with a driving motor 3 and connected to one end of its input shaft, and the other end of the input shaft of the main gear box 4 is connected to the input shaft of the auxiliary gear box 5 through the connecting shaft 6, it is ensured that the driving motor 3 can not only directly drive the main push rod 1 to move through the main gear box 4, but also synchronously drive the auxiliary push rod 2 to move through the connecting shaft 6 and the auxiliary gear box 5, ensuring that the same driving motor 3 can simultaneously drive the main push rod 1 and the auxiliary push rod 2 to move synchronously, the structure is simple, the installation and maintenance are convenient, and the manufacturing and use costs are effectively reduced. At the same time, the synchronous action of the main push rod 1 and the auxiliary push rod 2 can be achieved without setting up an additional control structure, thereby ensuring the stability of the lifting process and facilitating the use of the electric lifting tailgate.
[0036] The above are only preferred embodiments of the present invention, and do not limit the implementation mode and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.
Claims
1. A coaxial automobile tailgate lifting structure, comprising two lifting push rods, the two lifting push rods are respectively a main push rod and an auxiliary push rod and are spaced apart on both sides of a platform plate, characterized in that: It also includes a driving motor, a main gearbox, a sub-gearbox and a connecting shaft. The main gearbox and the sub-gearbox are respectively installed on the main push rod and the sub-push rod. The driving motor is installed on the main gearbox and is dynamically connected to the input shaft of the main gearbox. The other end of the input shaft of the main gearbox extends outside the main gearbox to form a sub-drive shaft. The connecting shaft is arranged between the main gearbox and the sub-gearbox. The two ends of the connecting shaft are respectively connected to the input shaft of the sub-gearbox and the sub-drive shaft.
2. The coaxial automobile tailgate lifting structure according to claim 1 is characterized in that: Couplings are arranged between the connecting shaft, the input shaft of the secondary gear and the secondary drive shaft, and the couplings are all universal joint couplings.
3. The coaxial automobile tailgate lifting structure according to claim 1, characterized in that: The main push rod and the auxiliary push rod each include an outer tube, an inner tube and a screw pair. The inner tube is slidably arranged in the outer tube and circumferentially limited to each other. One end of the outer tube is mounted on the corresponding main gear box or the auxiliary gear box, and one end of the inner tube extends from an end of the outer tube away from the main gear box or the auxiliary gear box. The screw pair is installed in the inner tube, and the nut of the screw pair is fixed in the inner tube. The screw of the screw pair is threadedly connected to the nut and one end extends into the corresponding main gear box or the auxiliary gear box.
4. The coaxial automobile tailgate lifting structure according to claim 3 is characterized in that: The main gearbox and the auxiliary gearbox both include a housing, a power input shaft, a duplex gear and an output gear. The housing is mounted on the outer tube of the corresponding main push rod or the auxiliary push rod, the power input shaft is rotatably mounted on the housing, the duplex gear is rotatably mounted in the housing and a gear is dynamically connected to the power input shaft, the output gear is mounted on the corresponding main push rod or the auxiliary push rod and extends to the corresponding main gearbox or auxiliary gearbox on the lead screw, and the other gear of the duplex gear is meshed with the output gear.
5. The coaxial automobile tailgate lifting structure according to claim 4, characterized in that: A worm thread is provided at the middle portion of the power input shaft, and the gear that is connected to the power input shaft by the double gear is a worm gear.
6. The coaxial automobile tailgate lifting structure according to claim 4, characterized in that: One end of the power input shaft of the main gearbox is connected to the main shaft of the drive motor, and the other end extends out of the corresponding box body to form a connection between the auxiliary drive shaft and one end of the connecting shaft. One end of the power input shaft of the auxiliary gearbox extends out of the box body and is connected to the other end of the connecting shaft.
7. The coaxial automobile tailgate lifting structure according to claim 4, characterized in that: A deep groove ball bearing and an angular contact bearing are arranged between the screw of the screw pair and the housing of the corresponding main gear box or the auxiliary gear box, and a thrust bearing is also arranged between the screw and the housing.
8. The coaxial automobile tailgate lifting structure according to claim 3, characterized in that: A front end cover component is arranged between the end of the inner tube extending out of the outer tube and the outer tube, and the front end cover component includes an end cover body, an anti-sway inner ring, an inner sealing ring, an outer sealing ring, a scraper ring, a pressure plate and a locking screw. The end cover body is sleeved on the outside of the inner tube and the lower end is inserted into the outer tube. The anti-sway inner ring is sleeved on the outside of the inner tube and is located in the lower end of the end cover body. At the same time, the inner sealing ring and the outer sealing ring are both installed on the inner wall of the end cover body and sleeved on the outside of the inner tube. The scraper ring is sleeved on the outside of the inner tube and fixedly installed in the upper end of the end cover body. The pressure plate is sleeved on the outside of the inner tube and is installed on the upper end surface of the end cover body through the locking screw, and the pressure plate presses the scraper ring.