Electric tail plate coupling push rod lifting structure

Abstract

The utility model provides an electric tailboard coupling push rod lifting structure, and belongs to the technical field of automobile auxiliary equipment. The driving motor is arranged on the driving lifting push rod and is in power connection with the reduction gearbox of the driving lifting push rod, and the connecting shaft is arranged between the reduction gearbox of the driving lifting push rod and the reduction gearbox of the linkage lifting push rod and is connected with the reduction gearbox of the driving lifting push rod. The driving motor synchronously drives the active lifting push rod and the linkage lifting push rod to act, the structure is simple, wiring and assembling are convenient, synchronous action can be achieved under the condition that a regulation and control system is not configured, and therefore the control difficulty and cost are reduced. Besides, universal couplings are arranged at the two ends of the connecting shaft, universal connection of the driving lifting push rod and the follow-up lifting pull rod is achieved, the problem of position floating in the action process is solved, and therefore the electric push rod is suitable for error situations possibly caused by machining, installation and use, the structural flexibility is higher, and application and popularization of the electric push rod are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile auxiliary equipment, in particular to an electric tailgate coupling push rod lifting structure. Background Art

[0002] With the development of the logistics industry and the popularization of automation technology, as an important transfer equipment for goods in logistics, automobiles need to load and unload goods during transportation. Therefore, improving the loading and unloading efficiency of goods on automobiles and reducing the work burden and safety risks during manual loading and unloading have become the key concerns of the industry.

[0003] As an auxiliary equipment widely used in the process of loading and unloading automobile goods, the automobile tailgate is usually installed at the rear of the automobile cargo box. When in use, the tailgate is lifted or lowered to realize the transfer between the carriage and the ground, so as to meet the needs of goods loading and unloading. At present, the automobile tailgates on the market usually adopt a hydraulic power system, that is, the lifting structure of the automobile tailgate is hydraulic cylinders located on both sides of the tailgate. The telescopic movement of the hydraulic cylinders is controlled through hydraulic pipelines, so as to realize the lifting of the tailgate. However, in the actual use process, the automobile tailgate with a hydraulic power system is prone to problems such as leakage after long-term use, difficult maintenance and high maintenance costs. Although there have gradually emerged automobile tailgates with an electric power system replacing the hydraulic power system on the market, that is, replacing the hydraulic cylinders on both sides with electric push rods, that is, realizing the electric lifting of the tailgate through two electric push rods. Compared with the traditional hydraulic power system, it not only facilitates wiring, avoids leakage problems, but also is convenient for control and maintenance. However, in the two lifting electric push rods of the existing automobile electric tailgate, both electric push rods are equipped with independent drive motors and speed reducers, resulting in a relatively high cost. In addition, during the lifting process of the automobile tailgate, to ensure balance and stability, the two electric push rods need to have a high degree of action synchronization, which requires an additional configuration of a regulation system to achieve, increasing the control difficulty and cost, and is not conducive to the popularization and use of electric push rods. Summary of the Utility Model

[0004] Aiming at the above problems existing in the prior art, the present invention aims to provide an electric tailgate coupling push rod lifting structure, in which a connecting shaft is arranged between the active lifting push rod and the linkage lifting push rod. At the same time, universal couplings are arranged between the two ends of the connecting shaft and the active lifting push rod and the linkage lifting push rod respectively. Through the universal couplings, the universal connection between the active lifting push rod and the linkage lifting push rod is realized, which can not only meet the transmission requirements, but also adapt to the machining and installation errors, ensuring that the active lifting push rod can lift itself while synchronously driving the linkage lifting push rod to lift. It realizes that one drive motor can drive the active lifting push rod and the linkage lifting push rod to act synchronously at the same time. It not only has a simple structure, is conducive to wiring and assembly, but also can realize synchronous action without additionally configuring a regulation system, thus reducing the control difficulty and cost, and is conducive to the popularization and use of electric push rods.

[0005] The specific technical solution is as follows:

[0006] An electric tailgate coupling push rod lifting structure includes two push rods, and has the following characteristics. It also includes a connecting shaft and a universal coupling. The two push rods are respectively a driving lifting push rod and a linkage lifting push rod. A driving motor is installed on the driving lifting push rod, and the driving motor is power-connected to the reduction gearbox of the driving lifting push rod. At the same time, the reduction gearbox of the driving lifting push rod is also provided with a secondary output shaft, and the secondary output shaft is arranged towards the linkage lifting push rod. The reduction gearbox of the linkage lifting push rod is provided with an input shaft and is arranged towards the secondary output shaft. The connecting shaft is arranged between the input shaft and the secondary output shaft of the reduction gearbox of the linkage lifting push rod, and universal couplings are arranged between both ends of the connecting shaft and the input shaft and the secondary output shaft of the reduction gearbox of the linkage lifting push rod.

[0007] In the above-mentioned electric tailgate coupling push rod lifting structure, the universal coupling includes a long universal joint coupling and a short universal joint coupling, and the long universal joint coupling and the short universal joint coupling are respectively located at both ends of the connecting shaft. Moreover, one end of the connecting shaft that cooperates with the long universal joint coupling is inserted into the long universal joint coupling and is slidably arranged on the long universal joint coupling along its own axial direction.

[0008] In the above-mentioned electric tailgate coupling push rod lifting structure, the long universal joint coupling includes a short connecting end, a long connecting end, a cross bearing, and a limiting member. The short connecting end is connected to the input shaft or the secondary output shaft of the reduction gearbox of the linkage lifting push rod. A cross bearing is arranged between the other end of the short connecting end and one end of the long connecting end. A telescopic hole is formed at the other end of the long connecting end. One end of the connecting shaft is inserted into the telescopic hole. The limiting member is arranged on the long connecting end and one end penetrates into the telescopic hole. When the end of the connecting shaft is inserted into the telescopic hole, the limiting member restricts the sliding of the connecting shaft in the telescopic hole.

[0009] In the above-mentioned electric tailgate coupling push rod lifting structure, when one end of the connecting shaft is inserted into the telescopic hole and installed in place, a vacant space is arranged between the end of the connecting shaft and the bottom of the telescopic hole, and the length of the vacant space is greater than the length of the other end of the connecting shaft connected to the short connecting end on the short universal joint coupling.

[0010] In the above-mentioned electric tailgate coupling push rod lifting structure, a floating fitting hole is formed at one end of the connecting shaft inserted into the telescopic hole, and the floating fitting hole is a strip-shaped hole arranged along the axial direction of the connecting shaft. During installation, one end of the limiting member penetrating into the telescopic hole is inserted into the floating fitting hole.

[0011] The above-mentioned electric tailgate coupling push-rod lifting structure, wherein the speed reducers of the active lifting push-rod and the linkage lifting push-rod both include a box body, a main drive shaft, a driving gear, a double gear, and an output gear. The box body is installed on the outer tube of the corresponding active lifting push-rod and the linkage lifting push-rod. The driving motor is installed on the box body of the speed reducer of the active lifting push-rod. The main drive shaft is rotatably installed in the box body and is sleeved with the driving gear. The main drive shaft of the speed reducer of the active lifting push-rod is power-connected to the main shaft of the driving motor. One end of the lead screw of the lead screw pair of the active lifting push-rod and the linkage lifting push-rod extends into the box body of the corresponding speed reducer and is sleeved with the output gear. The double gear is rotatably installed in the box body and is located between the driving gear and the output gear, and the driving gear and the output gear are respectively meshed with the large gear and the small gear of the double gear.

[0012] The above-mentioned electric tailgate coupling push-rod lifting structure, wherein the speed reducer of the active lifting push-rod further includes an output assembly, and the speed reducer of the linkage lifting push-rod further includes an input assembly. Both the output assembly and the input assembly include a bevel gear set and a rotating shaft. The rotating shaft is rotatably installed on the corresponding box body. The bevel gear set is arranged between the main drive shaft and the rotating shaft. And the rotating shaft of the output assembly of the active lifting push-rod is the secondary output shaft. A connecting shaft is arranged between the rotating shaft of the input assembly of the speed reducer of the linkage lifting push-rod and the secondary output shaft.

[0013] The above-mentioned electric tailgate coupling push-rod lifting structure, wherein the driving motor is a motor with a brake.

[0014] The above-mentioned electric tailgate coupling push-rod lifting structure, wherein the driving motor is equipped with a planetary reduction assembly. The planetary reduction assembly includes a planetary reduction housing, a planetary input shaft, a planetary output shaft, and a planetary gear set. The planetary input shaft and the planetary output shaft are both rotatably installed on the planetary reduction housing and are coaxially arranged. The planetary output shaft is the main drive shaft of the corresponding speed reducer. The planetary input shaft is power-connected to the main shaft of the driving motor. The planetary gear set is arranged between the planetary input shaft and the planetary output shaft.

[0015] The above-mentioned electric tailgate coupling push-rod lifting structure, wherein the electric tailgate further includes a frame, a follower arm, a lifting arm, a fixed beam, a lifting seat, a bearing platform, and a door closing push-rod. One end of the follower arm is hinged to the frame. The middle part of the follower arm is hinged to one end of the lifting arm. The other end of the follower arm is hinged to the bottom end of the active lifting push-rod or the linkage lifting push-rod. One end of the fixed beam is hinged to the frame. The telescopic end of the active lifting push-rod or the linkage lifting push-rod is hinged to the middle and lower position of the lifting arm. The other end of the fixed beam is hinged to the bottom end of the lifting seat. The other end of the lifting arm is hinged to the upper end of the lifting seat. At the same time, the upper part of the rear end of the bearing platform is also hinged to the hinged part of the lifting arm and the lifting seat. And the lower part of the rear end of the bearing platform abuts against the lifting seat. The bottom end of the door closing push-rod is hinged to the middle position of the corresponding side of the fixed beam. The telescopic end of the door closing push-rod is hinged to the bearing platform.

[0016] The positive effects of the above technical solution are as follows:

[0017] For the above electric tailgate coupling push rod lifting structure, a connecting shaft is arranged between the active lifting push rod and the linkage lifting push rod. Through the connecting shaft, the power structures of the active lifting push rod and the linkage lifting push rod are connected into an integral structure. At the same time, a driving motor is arranged on the active lifting push rod, so that while the active lifting push rod moves itself, it can also drive the linkage lifting push rod to move synchronously through the connecting shaft, realizing that one driving motor drives the active lifting push rod and the linkage lifting push rod to move synchronously at the same time. It not only has a simple structure, which is conducive to wiring and assembly, but also can achieve synchronous movement without additionally configuring a control system, thereby reducing the control difficulty and cost. Moreover, universal couplings are arranged between both ends of the connecting shaft and the active lifting push rod and the linkage lifting push rod respectively. Through the universal couplings, the universal connection between the active lifting push rod and the linkage lifting push rod is realized. While meeting the transmission requirements, it can also achieve position floating, adapting to the position errors that may occur during processing, installation, and use, with higher structural flexibility, which is conducive to the popularization and use of electric push rods. Description of the Drawings

[0018] Figure 1 It is a structural diagram of an electric tailgate of the present utility model;

[0019] Figure 2 It is a structural diagram of an embodiment of the electric tailgate coupling push rod lifting structure of the present utility model;

[0020] Figure 3 It is a structural diagram of the long universal joint coupling of the active lifting push rod of a preferred embodiment of the present utility model;

[0021] Figure 4 It is a structural diagram of the short universal joint coupling of the active lifting push rod of a preferred embodiment of the present utility model;

[0022] Figure 5 It is a structural diagram of the active lifting push rod of a preferred embodiment of the present utility model;

[0023] Figure 6 It is a cross-sectional view of the active lifting push rod of a preferred embodiment of the present utility model from one perspective;

[0024] Figure 7 It is a cross-sectional view of the active lifting push rod of a preferred embodiment of the present utility model from another perspective;

[0025] Figure 8 It is a structural diagram of the speed reducer of the active lifting push rod of a preferred embodiment of the present utility model.

[0026] In the drawings: 1. Active lifting push rod; 11. Driving motor; 12. Reduction gearbox; 121. Housing; 122. Main drive shaft; 123. Driving gear; 124. Double gear; 125. Output gear; 126. Output assembly; 111. Planetary reduction assembly; 1111. Planetary reduction housing; 1112. Planetary input shaft; 1113. Planetary output shaft; 1114. Planetary gear set; 1261. Bevel gear set; 1262. Rotating shaft; 2. Linkage lifting push rod; 22. Input assembly; 3. Connecting shaft; 31. Floating mating hole; 4. Long universal joint coupling; 41. Short connecting end; 42. Long connecting end; 43. Cross bearing; 44. Limiting part; 45. Telescopic hole; 5. Short universal joint coupling; 51. Locking part; 6. Frame; 61. Follow-up arm; 62. Lifting arm; 63. Fixed beam; 64. Lifting seat; 65. Loading platform; 66. Door closing push rod. Detailed implementation mode

[0027] In order to make the technical means, creative features, achieved purposes and functions realized by the present utility model easy to understand, the following embodiments are combined with the attached Figure 1 to the attached Figure 8 to specifically elaborate on the technical solutions provided by the present utility model, but the following content shall not be construed as a limitation of the present utility model.

[0028] Figure 1 It is a structural diagram of an electric tailgate of the present utility model; Figure 2 It is a structural diagram of an embodiment of a coupling push rod lifting structure of an electric tailgate of the present utility model. As Figure 1 and Figure 2 shown, the coupling push rod lifting structure of the electric tailgate provided in this embodiment includes two push rods, a connecting shaft 3 and a universal coupling. At this time, the two push rods are respectively an active lifting push rod 1 and a linkage lifting push rod 2, and the active lifting push rod 1 and the linkage lifting push rod 2 are respectively used as the lifting power structures on both sides of the electric tailgate.

[0029] Specifically, a driving motor 11 is installed on the active lifting push rod 1, and the driving motor 11 is power-connected to the speed reducer 12 of the active lifting push rod 1, that is, the active lifting push rod 1 is self-equipped with the driving motor 11 and the corresponding speed reducer 12 to realize its own telescopic movement. At the same time, a secondary output shaft is provided on the speed reducer 12 of the active lifting push rod 1, and the secondary output shaft is arranged towards the linkage lifting push rod 2, providing conditions for the secondary output shaft on the speed reducer 12 of the subsequent active lifting push rod 1 to drive the linkage lifting push rod 2 to move synchronously. In addition, the linkage lifting push rod 2 is also self-equipped with a speed reducer 12, and an input shaft is provided on the speed reducer 12 of the linkage lifting push rod 2 and arranged towards the secondary output shaft, providing conditions for the input shaft of the speed reducer 12 of the subsequent linkage lifting push rod 2 to be connected to the secondary output shaft on the speed reducer 12 of the active lifting push rod 1. In addition, the connecting shaft 3 is arranged between the input shaft and the secondary output shaft of the speed reducer 12 of the linkage lifting push rod 2, and universal couplings are provided between both ends of the connecting shaft 3 and the input shaft and the secondary output shaft of the speed reducer 12 of the linkage lifting push rod 2, that is, the power connection between the secondary output shaft on the speed reducer 12 of the active lifting push rod 1 and the input shaft of the speed reducer 12 of the linkage lifting push rod 2 is realized through the connecting shaft 3, ensuring that the power of the active lifting push rod 1 can be transmitted synchronously to the linkage lifting push rod 2, realizing that the active lifting push rod 1 can drive the linkage lifting push rod 2 to move synchronously through the connecting shaft 3 while performing its own action, realizing that one driving motor 11 can drive the active lifting push rod 1 and the linkage lifting push rod 2 to move synchronously at the same time. It not only has a simple structure, is conducive to wiring and assembly, but also can realize synchronous movement without additionally configuring a control system, thereby reducing the control difficulty and cost. In addition, universal couplings are provided between both ends of the connecting shaft 3 and the active lifting push rod 1 and the linkage lifting push rod 2, which can not only meet the power transmission requirements, but also realize the adjustment of the connection state and the position floating adjustment, effectively adapting to the position errors that may occur during the processing, installation and use processes, with higher structural flexibility and facilitating the popularization and use of electric push rods.

[0030] Figure 3 Structural diagram of the long universal joint coupling of the active lifting push rod in a preferred embodiment of the present invention; Figure 4 Structural diagram of the short universal joint coupling of the active lifting push rod in a preferred embodiment of the present invention. As Figures 2 to 4As shown, the universal coupling includes a long universal joint coupling 4 and a short universal joint coupling 5. At this time, the long universal joint coupling 4 and the short universal joint coupling 5 are respectively located at both ends of the connecting shaft 3. Moreover, one end of the connecting shaft 3 that cooperates with the long universal joint coupling 4 is inserted into the long universal joint coupling 4 and slidably arranged on the long universal joint coupling 4 along its own axial direction. That is, when the connecting shaft 3 is cooperatively installed with the long universal joint coupling 4, the cooperative installation length of the connecting shaft 3 on the long universal joint coupling 4 can be adjusted, providing conditions for realizing the axial displacement compensation of the connecting shaft 3 during subsequent use, thereby adapting to the situation where the distance between the active lifting push rod 1 and the linkage lifting push rod 2 may change during the movement process, and ensuring the normal operation of the lifting structure.

[0031] More specifically, the long universal joint coupling 4 further includes a short connection end 41, a long connection end 42, a cross bearing 43, and a limiting member 44. During installation, the short connection end 41 is connected to the input shaft or the secondary output shaft of the reduction gearbox 12 of the linkage lifting push rod 2. That is, the long universal joint coupling 4 can be arranged at one end of the connecting shaft 3 connecting the active lifting push rod 1, or can be arranged at one end of the connecting shaft 3 connecting the linkage lifting push rod 2. At the same time, a cross bearing 43 is arranged between the other end of the short connection end 41 and one end of the long connection end 42, realizing the universal connection between the short connection end 41 and the long connection end 42. In addition, a telescopic hole 45 is opened at the other end of the long connection end 42. At the same time, one end of the connecting shaft 3 is inserted into the telescopic hole 45. That is, the telescopic hole 45 on the long connection end 42 serves as the structure for connecting the long universal joint coupling 4 and the connecting shaft 3. At this time, the limiting member 44 is arranged on the long connection end 42 and one end penetrates into the telescopic hole 45. When the end of the connecting shaft 3 is inserted into the telescopic hole 45, the limiting member 44 restricts the sliding of the connecting shaft 3 in the telescopic hole 45. That is, the position of the connecting shaft 3 after being installed in the telescopic hole 45 can be restricted by the limiting member 44, avoiding the problem that the end of the connecting shaft 3 comes out of the telescopic hole 45 during use. It should be noted that the structure of the short universal joint coupling 5 is similar to that of the long universal joint coupling 4. The only difference between the two is that the long universal joint coupling 4 has a short connection end 41 and a long connection end 42, while the short universal joint coupling 5 has two short connection ends 41. And, a jack corresponding to the end of the connecting shaft 3 is opened on one of the short connection ends 41. One end of the connecting shaft 3 is inserted into the jack, and a locking member 51 is arranged on the short connection end 41 provided with the jack. One end of the locking member 51 penetrates through the jack and then locks or loosens the end of the connecting shaft 3 inserted into the jack, realizing the stable connection of the connecting shaft 3 and the jack or taking it out of the jack after loosening. In addition, both the limiting member 44 of the long universal joint coupling 4 and the locking member 51 of the short universal joint coupling 5 are bolts. At this time, locking holes penetrating through the telescopic hole 45 are opened on the corresponding long connection end 42 and short connection end 41. The bolts are installed in the locking holes, and the corresponding bolts realize the connection and loosening between the connecting shaft 3, the long universal joint coupling 4, and the short universal joint coupling 5 through the corresponding locking holes, providing convenience for disassembling and assembling the connecting shaft 3.

[0032] More specifically, when one end of the connecting shaft 3 is inserted into the telescopic hole 45 and installed in place, and the other end of the connecting shaft 3 is also installed in place with the short universal joint coupling 5, there is a vacant space between the end of the connecting shaft 3 and the bottom of the telescopic hole 45. At this time, it is set that the length of the vacant space is greater than the length of the short connecting end 41 of the connecting shaft 3 connected to the short universal joint coupling 5 at the other end, that is, the length of the vacant space between the end of the connecting shaft 3 and the bottom of the telescopic hole 45 is greater than the length of the connecting shaft 3 inserted into the jack on the short connecting end 41 of the short universal joint coupling 5. Thus, when maintenance and repair are needed in the later stage, the connecting shaft 3 can be moved towards the inner side of the telescopic hole 45 of the long connecting end 42, and the vacant space provides a clearance space for the movement of the connecting shaft 3, so that the other end of the connecting shaft 3 can be disengaged from the jack of the short connecting end 41 of the short universal joint coupling 5, facilitating the installation and disassembly of the connecting shaft 3. Similarly, when the connecting shaft 3 needs to be installed and reset, the connecting shaft 3 can be first moved towards the inner side of the telescopic hole 45 so that the other end of the connecting shaft 3 can be located at the orifice of the jack, and then the connecting shaft 3 is pulled out towards the outer side of the telescopic hole 45 so that the other end of the connecting shaft 3 can be inserted into the jack, and then the end of the connecting shaft 3 is locked in the jack by the locking member 51, thus realizing the quick installation of the connecting shaft 3 without disassembling the long universal joint coupling 4 and the short universal joint coupling 5, and the disassembly and assembly are more convenient and fast.

[0033] More specifically, a floating fit hole 31 is also provided at one end of the connecting shaft 3 inserted into the telescopic hole 45. At this time, it is set that the floating fit hole 31 is a strip-shaped hole arranged along the axial direction of the connecting shaft 3, so that the floating fit hole 31 forms a hole body structure with a predetermined length arranged along its axial direction on the connecting shaft 3. During installation, one end of the limiting member 44 penetrating into the telescopic hole 45 is inserted into the floating fit hole 31. Through the mutual limitation of the limiting member 44 and the floating fit hole 31, the end of the connecting shaft 3 can still move axially through the floating fit hole 31 after being inserted into the telescopic hole 45, thus realizing the adaptation to the change in the distance between the long universal joint coupling 4 and the short universal joint coupling 5, and playing a role in compensating for the change in the distance between the active lifting push rod 1 and the linkage lifting push rod 2 during the movement process, effectively eliminating the axial force inside the lifting structure, and the structural design is more reasonable.

[0034] Figure 5 Structural diagram of the active lifting push rod of a preferred embodiment of the present invention; Figure 6 Cross-sectional view of the active lifting push rod of a preferred embodiment of the present invention from one perspective; Figure 7 Cross-sectional view of the active lifting push rod of a preferred embodiment of the present invention from another perspective; Figure 8 Structural diagram of the reduction gearbox of the active lifting push rod of a preferred embodiment of the present invention. As Figure 1 、 Figure 2 AndFigures 5 to 8 As shown, the speed reducers 12 of the active lifting push rod 1 and the linkage lifting push rod 2 each further include a housing 121, a main drive shaft 122, a driving gear 123, a double gear 124, and an output gear 125. During installation, the housing 121 is installed on the outer tubes of the corresponding active lifting push rod 1 and the linkage lifting push rod 2. At the same time, the driving motor 11 is installed on the housing 121 of the speed reducer 12 of the active lifting push rod 1, realizing an integrated arrangement of the outer tube, the speed reducer 12, and the driving motor 11, with better structural integrity. In addition, the main drive shaft 122 is rotatably installed in the housing 121 and is sleeved with the driving gear 123. The main drive shaft 122 of the speed reducer 12 of the active lifting push rod 1 is power-connected to the main shaft of the driving motor 11, enabling the driving motor 11 to drive the main drive shaft 122 of the speed reducer 12 of the active lifting push rod 1 to rotate, realizing the self-driving of the active lifting push rod 1. At the same time, one end of the lead screw of the lead screw pair of the active lifting push rod 1 and the linkage lifting push rod 2 extends into the housing 121 of the corresponding speed reducer 12 and is sleeved with the output gear 125, enabling the output gear 125 to drive the lead screw of the lead screw pair of the corresponding active lifting push rod 1 and the linkage lifting push rod 2 to rotate. In addition, the double gear 124 is rotatably installed in the housing 121 and is located between the driving gear 123 and the output gear 125, and the driving gear 123 and the output gear 125 are respectively meshed with the large gear and the small gear of the double gear 124. When the driving motor 11 drives the driving gear 123 to rotate, the driving gear 123 can transmit power to the output gear 125 through the double gear 124, thereby driving the lead screw in the lead screw pair to rotate, and then realizing the telescopic movement of the corresponding active lifting push rod 1 or the linkage lifting push rod 2. That is, the active lifting push rod 1 can realize the rotation of its own main drive shaft 122 through the self-provided driving motor 11, while the main drive shaft 122 of the linkage lifting push rod 2 needs to be driven by the connecting shaft 3 later. It should be noted that in addition to the above-mentioned outer tube, the push rod bodies of the active lifting push rod 1 and the linkage lifting push rod 2 further include an inner tube and a lead screw pair. The inner tube slides in the outer tube and is circumferentially limited to each other. The nut of the lead screw pair is installed at one end of the inner tube and fixed to the inner tube. The lead screw of the lead screw pair is threadedly connected to the nut. One end of the lead screw of the lead screw pair extends into the housing 121 of the corresponding speed reducer 12 and is rotatably installed on the housing 121. At the same time, the output gear 125 is sleeved on this end of the lead screw of the lead screw pair, enabling the subsequent rotation of the lead screw to drive the nut to slide axially along it, thereby realizing the telescopic movement of the inner tube relative to the outer tube.

[0035] More specifically, the reduction gearbox 12 of the active lifting push rod 1 further includes an output assembly 126, through which the power output by the driving motor 11 is transmitted. At the same time, the reduction gearbox 12 of the linkage lifting push rod 2 further includes an input assembly 22, so that the input assembly 22 can serve as the power receiving structure of the linkage lifting push rod 2. In addition, both the output assembly 126 and the input assembly 22 further include bevel gear sets 1261 and rotating shafts 1262. During installation, the rotating shaft 1262 is rotatably installed on the corresponding box body 121, and one end of the rotating shaft 1262 extends outside the box body 121. At the same time, the bevel gear set 1261 is arranged between the main drive shaft 122 and the rotating shaft 1262, so that power can be transmitted between the rotating shaft 1262 and the corresponding main drive shaft 122 through the bevel gear set 1261, which can not only meet the power transmission requirements but also change the power transmission direction, thus meeting the connection requirements of the connecting shaft 3. And, the rotating shaft 1262 of the output assembly 126 of the active lifting push rod 1 is set as the secondary output shaft, that is, when the active lifting push rod 1 acts, power can be transmitted to the connecting shaft 3 through the rotating shaft 1262 of its output assembly 126. At the same time, the connecting shaft 3 is arranged between the rotating shaft 1262 of the input assembly 22 of the reduction gearbox 12 of the linkage lifting push rod 2 and the secondary output shaft, so that the power of the driving motor 11 can not only supply the active lifting push rod 1 to act, but also drive the linkage lifting push rod 2 to act synchronously through the rotating shaft 1262 of the output assembly 126 of the reduction gearbox 12 of the active lifting push rod 1, the connecting shaft 3 and the rotating shaft 1262 of the input assembly 22 of the reduction gearbox 12 of the linkage lifting push rod 2, realizing the requirement that one driving motor 11 drives the active lifting push rod 1 and the linkage lifting push rod 2 to act simultaneously.

[0036] More specifically, the driving motor 11 is a motor with a brake, which can automatically brake when the driving motor 11 is powered off, realizing the clamping and locking of the main shaft of the motor, improving the safety guarantee. It should be noted that the motor with a brake is an existing product on the market and can be directly purchased and installed for use. Therefore, its specific structure will not be elaborated here.

[0037] More specifically, the drive motor 11 also comes with a planetary reduction assembly 111. At this time, the planetary reduction assembly 111 further includes a planetary reduction housing 1111, a planetary input shaft 1112, a planetary output shaft 1113, and a planetary gear set 1114. During installation, the planetary reduction housing 1111 is installed between the outer shell of the drive motor 11 and the housing 121 of the reduction gearbox 12 of the active lifting push rod 1. The planetary input shaft 1112 and the planetary output shaft 1113 are both rotatably installed on the planetary reduction housing 1111 and arranged coaxially. At this time, one end of the planetary output shaft 1113 extends into the corresponding reduction gearbox 12 and is used as the main drive shaft 122 of the corresponding reduction gearbox 12. The planetary input shaft 1112 is power-connected to the main shaft of the drive motor 11. The planetary gear set 1114 is arranged between the planetary input shaft 1112 and the planetary output shaft 1113, achieving the purpose of transmitting power from the drive motor 11 to the main drive shaft 122 of the corresponding reduction gearbox 12. At the same time, it can also reduce the speed and increase the torque, providing conditions for the subsequent stable driving of the screw of the screw pair to rotate.

[0038] More specifically, the electric tailgate further includes a frame 6, a follower arm 61, a lifting arm 62, a fixed beam 63, a lifting seat 64, a carrying platform 65, and a door closing push rod 66. One end of the follower arm 61 is hinged to the frame 6. The middle of the follower arm 61 is hinged to one end of the lifting arm 62. The other end of the follower arm 61 is hinged to the bottom end of the active lifting push rod 1 or the linkage lifting push rod 2. One end of the fixed beam 63 is hinged to the frame 6. The telescopic end of the active lifting push rod 1 or the linkage lifting push rod 2 is hinged to the middle and lower position of the lifting arm 62. The other end of the fixed beam 63 is hinged to the bottom end of the lifting seat 64. The other end of the lifting arm 62 is hinged to the upper end of the lifting seat 64. At the same time, the upper part of the rear end of the carrying platform 65 is also hinged to the hinge joint of the lifting arm 62 and the lifting seat 64. And the lower part of the rear end of the carrying platform 65 abuts against the lifting seat 64. The bottom end of the door closing push rod 66 is hinged to the middle position of the corresponding fixed beam 63. The telescopic end of the door closing push rod 66 is hinged to the carrying platform 65, so that when the active lifting push rod 1 and the linkage lifting push rod 2 act, the lifting movement of the carrying platform 65 can be realized, and the carrying platform 65 can be flipped through the door closing push rod 66, meeting the door opening and closing requirements and the normal use requirements of the electric tailgate.

[0039] The electric tailgate coupling push rod lifting structure provided in this embodiment includes a main lifting push rod 1, a linkage lifting push rod 2, a connecting shaft 3 and a universal coupling. By arranging a driving motor 11 on the main lifting push rod 1 and power-connecting it to the reduction gearbox 12 of the main lifting push rod 1. At the same time, a connecting shaft 3 is arranged and interconnected between the reduction gearbox 12 of the main lifting push rod 1 and the reduction gearbox 12 of the linkage lifting push rod 2, so that the power structures of the main lifting push rod 1 and the linkage lifting push rod 2 can form a whole through the connecting shaft 3. When the driving motor 11 drives the main lifting push rod 1 to act, the linkage lifting push rod 2 can be synchronously driven through the connecting shaft 3. It realizes that one driving motor 11 synchronously drives the main lifting push rod 1 and the linkage lifting push rod 2 to act. The structure is simple, the wiring and assembly are convenient, and synchronous action can be achieved without configuring a control system, thus reducing the control difficulty and cost. In addition, by arranging universal couplings at both ends of the connecting shaft 3, the universal connection between the main lifting push rod 1 and the follower lifting drag rod is realized, which satisfies the problem of position floating during the action process, thereby adapting to the error scenarios that may be caused by processing, installation and use. The structure has higher flexibility and is conducive to the popularization and use of electric push rods.

[0040] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention accordingly. For those skilled in the art, it should be able to realize that the solutions obtained by equivalent substitution and obvious changes made by using the description and illustrated content of the present invention should all be included in the protection scope of the present invention.

Claims

1. An electric tailgate coupling push rod lifting structure, comprising two push rods, characterized in that: It also includes a connecting shaft and a universal coupling, the two push rods are respectively an active lifting push rod and a linked lifting push rod, the active lifting push rod is equipped with a driving motor, and the driving motor is dynamically connected to the reduction gearbox of the active lifting push rod, and at the same time, the reduction gearbox of the active lifting push rod is also provided with a secondary output shaft, and the secondary output shaft is arranged toward the linked lifting push rod, the reduction gearbox of the linked lifting push rod is provided with an input shaft and arranged toward the secondary output shaft, the connecting shaft is provided between the input shaft of the reduction gearbox of the linked lifting push rod and the secondary output shaft, and the universal coupling is provided between both ends of the connecting shaft and the input shaft and the secondary output shaft of the reduction gearbox of the linked lifting push rod.

2. The electric tailgate coupling push rod lifting structure according to claim 1 is characterized in that: The universal joint coupling comprises a long universal joint coupling and a short universal joint coupling, and the long universal joint coupling and the short universal joint coupling are respectively located at two ends of the connecting shaft, and one end of the connecting shaft that cooperates with the long universal joint coupling is inserted into the long universal joint coupling and slidably arranged on the long universal joint coupling along its own axial direction.

3. The electric tailgate coupling push rod lifting structure according to claim 2 is characterized in that: The long universal joint coupling includes a short connecting end, a long connecting end, a cross bearing and a limit piece. The short connecting end is connected to the input shaft of the reduction gearbox of the linked lifting push rod or the secondary output shaft. The cross bearing is arranged between the other end of the short connecting end and one end of the long connecting end. The other end of the long connecting end is provided with a telescopic hole. One end of the connecting shaft is inserted into the telescopic hole. The limit piece is arranged on the long connecting end and one end thereof passes through the telescopic hole. When the end of the connecting shaft is inserted into the telescopic hole, the limit piece limits the slippage of the connecting shaft in the telescopic hole.

4. The electric tailgate coupling push rod lifting structure according to claim 3 is characterized in that: When one end of the connecting shaft is inserted into the telescopic hole and installed in place, a spare space is provided between the end of the connecting shaft and the bottom of the telescopic hole, and the length of the spare space is greater than the length of the other end of the connecting shaft connected to the short universal joint coupling.

5. The electric tailgate coupling push rod lifting structure according to claim 4 is characterized in that: A floating matching hole is provided on one end of the connecting shaft inserted into the telescopic hole, and the floating matching hole is a strip hole arranged axially along the connecting shaft. During installation, the end of the limiting member that passes through the telescopic hole is inserted into the floating matching hole.

6. The electric tailgate coupling push rod lifting structure according to claim 5, characterized in that: The reduction gearboxes of the active lifting push rod and the linked lifting push rod each include a housing, a main drive shaft, a driving gear, a duplex gear, and an output gear. The housing is installed on the outer tubes of the corresponding active lifting push rod and the linked lifting push rod, the driving motor is installed on the housing of the reduction gearbox of the active lifting push rod, the main drive shaft is rotatably installed in the housing and is sleeved with the driving gear, the main drive shaft of the reduction gearbox of the active lifting push rod is dynamically connected to the main shaft of the driving motor, one end of the screw rod of the screw rod pair of the active lifting push rod and the linked lifting push rod extends into the housing of the corresponding reduction gearbox and is sleeved with the output gear, the duplex gear is rotatably installed in the housing and is located between the driving gear and the output gear, and the driving gear and the output gear are respectively meshed with the large gear and the small gear of the duplex gear.

7. The electric tailgate coupling push rod lifting structure according to claim 6, characterized in that: The reduction gearbox of the active lifting push rod also includes an output component, and the reduction gearbox of the linked lifting push rod also includes an input component. The output component and the input component both include a bevel gear set and a rotating shaft. The rotating shaft is rotatably installed on the corresponding housing. The bevel gear set is arranged between the main drive shaft and the rotating shaft. In addition, the rotating shaft of the output component of the active lifting push rod is the secondary output shaft, and the connecting shaft is arranged between the rotating shaft of the input component of the reduction gearbox of the linked lifting push rod and the secondary output shaft.

8. The electric tailgate coupling push rod lifting structure according to claim 1, characterized in that: The driving motor is a motor with a brake.

9. The electric tailgate coupling push rod lifting structure according to claim 6, characterized in that: The drive motor is provided with a planetary reduction assembly, which includes a planetary reduction housing, a planetary input shaft, a planetary output shaft and a planetary gear set. The planetary input shaft and the planetary output shaft are both rotatably mounted on the planetary reduction housing and are coaxially arranged. The planetary output shaft corresponds to the main drive shaft of the reduction box. The planetary input shaft is dynamically connected to the main shaft of the drive motor, and the planetary gear set is arranged between the planetary input shaft and the planetary output shaft.

10. The electric tailgate coupling push rod lifting structure according to claim 1, characterized in that: The electric tailgate also includes a frame, a follower arm, a lifting arm, a fixed beam, a lifting seat, a bearing platform and a door closing push rod, one end of the follower arm is hinged on the frame, the middle part of the follower arm is hinged with one end of the lifting arm, the other end of the follower arm is hinged with the bottom end of the active lifting push rod or the linkage lifting push rod, one end of the fixed beam is hinged to the frame, the telescopic end of the active lifting push rod or the linkage lifting push rod is hinged with the middle and lower position of the lifting arm, the other end of the fixed beam is hinged with the bottom end of the lifting seat, and the other end of the lifting arm is hinged with the upper end of the lifting seat. At the same time, the upper part of the rear end of the bearing platform is hinged at the hinge of the lifting arm and the lifting seat, and the lower part of the rear end of the bearing platform abuts against the lifting seat, the bottom end of the door closing push rod is hinged at the middle position of the fixed beam on the corresponding side, and the telescopic end of the door closing push rod is hinged with the bearing platform.

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