Lifter for motor home

Abstract

The limo lifter comprises a base fixedly installed at the bottom of the limo and a linear driving device rotationally connected to the base, the linear driving device comprises a tube shell body, a supporting tube is arranged at the power output end of the linear driving device, and a linkage structure is arranged between the linear driving device and the base. When the linear driving device drives the supporting pipe to be switched between the extending state and the retracting state relative to the pipe shell body, the supporting pipe is in linkage fit with the base through the linkage structure and drives the linear driving device to be switched between the unfolded state and the folded state relative to the base in an overturning mode, and the pipe shell body in the unfolded state is in supporting fit with the base. And a tension spring is connected between the linear driving device and the base. The device has the advantages of being convenient to operate, high in bearing capacity and free of occupying the space in the vehicle during storage.

Description

Technical Field

[0001] This invention relates to the field of RV accessories technology, and in particular to an RV lift. Background Technology

[0002] Chinese patent CN208378305U discloses a lightweight single-leg support electric jack bracket for RVs, including a main jack frame. A fixed base is located at the bottom of the main jack frame, with base positioning pins at both ends of the inner side of the fixed base. Main frame connecting pins are located on both sides of the fixed base. A support seat is installed at the top of the main jack frame, with an anti-slip rubber pad on the top surface of the support seat. A movable connecting pin is located on the inner side of the support seat, and a sliding groove is located at one end of the support seat. An adjustment hole is located at the top of the main jack frame, with a movable connecting pin in the adjustment hole. Screw connectors are installed at both ends of the main jack frame, with a threaded rod penetrating the inner side of the screw connector. One end of the threaded rod is connected to a motor drive, and a control box is located at the bottom of the motor drive.

[0003] However, the aforementioned electric RV jack bracket has the following drawbacks: the bracket is composed of multiple connecting rods, which makes the structure relatively complex and its load-bearing capacity is not strong enough. In addition, the bracket needs to be manually carried to the bottom of the vehicle for use, and after use, it needs to be stored and placed inside the vehicle, taking up space inside the vehicle. It urgently needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to provide a motorhome lift that is easy to operate, has a strong load-bearing capacity, and does not take up interior space when stored.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a motorhome lifter, comprising a base fixedly installed on the bottom of the vehicle and a linear drive device rotatably connected to the base. The linear drive device includes a tube shell body, and a support tube is provided at the power output end of the linear drive device. A linkage structure is provided between the linear drive device and the base. When the linear drive device drives the support tube to switch between an extended state and a retracted state relative to the tube shell body, the support tube is linked with the base through the linkage structure, and drives the linear drive device to flip and switch between an unfolded state and a retracted state relative to the base. The tube shell body in the unfolded state supports and cooperates with the base. A tension spring is connected between the linear drive device and the base, and the tension spring has a tendency to cause the linear drive device to rotate relative to the base in the unfolding direction.

[0006] By adopting the above technical solution, when the linear drive device drives the support tube to extend from the tube shell body, under the action of the linkage structure, the axial movement of the support tube is transmitted to the entire linear drive device, causing the linear drive device to rotate relative to the base. This allows the linear drive device to gradually unfold from its initial retracted state to a support posture perpendicular to the ground, thereby achieving the purpose of converting axial displacement into rotational motion. When the linear drive device is fully unfolded, its tube shell body forms a T-shaped rigid support structure with the base, greatly improving the support stability of the device. The robustness significantly improves the overall load-bearing rigidity and vibration resistance, effectively suppressing chassis sway. In addition, during the process of the linear drive unit flipping from the retracted state to the unfolded state relative to the base, the tension spring applies a restoring force in the unfolding direction to the linear drive unit, thereby assisting the linear drive unit to smoothly flip to the unfolded state. When retracting the linear drive unit, it only needs to overcome the preload of the tension spring to complete the retraction. The retraction method is simple and easy to operate. Furthermore, the entire device is hidden under the vehicle when retracted, without occupying interior space. It has the advantages of convenient operation, strong load-bearing capacity, and no space occupation when retracted.

[0007] A further configuration of the present invention is as follows: the linkage structure includes a rack, a gear assembly, and a fixed gear. The rack is connected to the output end of the linear drive device, the gear assembly is mounted on the main body of the tube shell, the fixed gear is anti-rotatingly connected to the base, and the axis of the fixed gear is coaxially arranged with the rotation center axis of the linear drive device. The rack meshes with the fixed gear through the gear assembly to drive the linear drive device to rotate relative to the base between an unfolded state and a retracted state with the axis of the fixed gear as the rotation center.

[0008] By adopting the above technical solution, the linear drive device drives the support tube to retract, causing the rack and gear assembly to contact and mesh with each other. If the linear drive device continues to drive the support tube to retract, the support tube drives the rack to mesh with the fixed gear through the gear assembly. Since the gear assembly is installed on the tube shell body, the last gear of the gear assembly revolves around the fixed gear, thereby causing the entire linear drive device to rotate relative to the base in the retraction direction with the axis of the gear as the rotation center. When the linear drive device drives the support tube to gradually extend from the retracted state, the rack also meshes with the fixed gear through the gear assembly, thereby realizing the entire linear drive device rotating relative to the base in the unfolding direction with the axis of the gear as the rotation center.

[0009] A further configuration of the present invention is as follows: the gear assembly includes a first transmission gear and a second transmission gear that mesh with each other; a first shaft portion and a second shaft portion are fixedly provided on the outer wall of the tube shell body; the first transmission gear is rotatably mounted on the first shaft portion; the second transmission gear is rotatably mounted on the second shaft portion; the linear drive device drives the rack to mesh with the first transmission gear; and the two ends of the second transmission gear mesh with the first transmission gear and the fixed gear, respectively.

[0010] A further configuration of the present invention is as follows: a fixed shaft is fixedly connected to the base, the linear drive device is rotatably connected to the fixed shaft, and the fixed gear is coaxially connected to the end of the fixed shaft and prevents rotation.

[0011] By adopting the above technical solution, the fixed shaft and the base are fixed to prevent rotation, and the linear drive device is rotatably connected to the fixed shaft. At the same time, the fixed gear is coaxially connected to the end of the fixed shaft to prevent rotation, so that the axis of the fixed shaft and the axis of the fixed gear coincide with each other. The common axis of the fixed shaft and the fixed gear serves as the rotation center axis of the linear drive device relative to the base. This can effectively avoid jamming caused by interference between the fixed shaft and the fixed gear when the linear drive device rotates relative to the base.

[0012] A further provision of the present invention is that a guide plate is fixedly provided on the main body of the tube along the length direction, and the rack is guided and slidably engaged with the guide plate.

[0013] By adopting the above technical solution and adding the guide plate, the consistency of the rack translation direction is improved, thereby enhancing the precision and stability of the device operation and ensuring the accuracy of the angle of rotation of the linear drive device relative to the base.

[0014] A further configuration of the present invention is as follows: the main body of the tube shell is rotatably connected to the base via a rotating shaft; the linkage structure includes a sliding sleeve and a connecting rod; the sliding sleeve is disposed on the main body of the tube shell; the extension direction of the connecting rod is set at an angle to the translation direction of the sliding sleeve; and a stop portion is provided at one end of the support tube away from the main body of the tube shell, the stop portion cooperating with the stop of the sliding sleeve. The connecting rod has a first hinge portion and a second hinge portion. The first hinge portion is rotatably connected to the sliding sleeve and the base. The rotation center axis of the second hinge portion is eccentrically set with respect to the axis of the rotating shaft.

[0015] By adopting the above technical solution, in use, the linear drive device drives the support tube to extend relative to the main body of the tube shell to provide support. At this time, the end of the linear drive device away from the support tube abuts against the base. When it is necessary to fold and store the linear drive device relative to the base, the linear drive device drives the support tube to gradually retract into the main body of the tube shell, so that the stop at the end of the support rod contacts the sliding sleeve. When the linear drive device drives the support rod to continue to move towards the main body of the tube shell with a tendency to retract, since the end of the linear drive device away from the support tube abuts against the base, under the action of the connecting rod, the main body of the tube shell is forced to rotate around the pivot point to the side away from the base. During the rotation process, the connecting rod drives the sliding sleeve to slide axially on the main body of the tube shell, avoiding interference and jamming between the sliding sleeve and the main body of the tube shell when the main body of the tube shell rotates. In use, the linear drive unit can extend the support tube to provide vertical support, increasing the load-bearing capacity of the vehicle body. Additionally, the device utilizes the stop at the end of the support tube to push the sliding sleeve axially onto the main body of the tube housing. Under the linkage of the connecting rod, the linear drive unit automatically folds and retracts relative to the base. The retraction method is simple and convenient. Furthermore, the entire device is hidden under the vehicle when retracted, without occupying interior space. By eccentrically setting the rotation center axis of the second hinge of the connecting rod to the axis of the rotating shaft, the device ensures that after the support tube retracts into the main body of the tube housing until the stop contacts the sliding sleeve, as the support tube continues to retract, the stop can continue to push the sliding sleeve towards the base, forcing the linear drive unit to rotate relative to the base in the retraction direction around the rotating shaft.

[0016] A further feature of the present invention is that the sliding sleeve is axially fixed with a first lubricating sleeve, and the sliding sleeve is slidably fitted onto the tube shell body through the first lubricating sleeve.

[0017] By adopting the above technical solution, the addition of the first lubrication sleeve improves the smoothness of the axial sliding of the sliding sleeve on the tube shell body and avoids noise caused by excessive friction when the sliding sleeve slides relative to the tube shell body.

[0018] A further provision of the present invention is that: an adjustable-length extension tube is installed at one end of the support tube away from the base, and a support plate is provided at one end of the extension tube away from the tube shell body. The support plate includes a bottom support portion and side support portions located on both sides of the bottom support portion and bent upward.

[0019] By adopting the above technical solution, the extension length of the extended tube relative to the support tube can be adjusted. At the same time, the bottom support and side support of the support plate can be used to achieve multi-angle support to the ground, increase the contact area between the support plate and the ground, and thus improve the support stability of the device for the vehicle.

[0020] A further feature of the present invention is that the extended tube is inserted into the support tube, and the support tube has a plurality of pin holes, the extended tube has a plurality of through holes spaced apart along its length, and pins are inserted through the pin holes and the corresponding through holes and fixed by clamps.

[0021] By adopting the above technical solution, the extension amount of the extended tube relative to the end of the support tube is adjusted to a predetermined position, and then a pin is inserted from the pin hole into the corresponding through hole, and the pin is fixed by a clamp.

[0022] A further configuration of the present invention is as follows: the linear drive device includes a motor body, a lead screw pair structure disposed within the tube shell body, and a sprocket structure that is transmissionally connected between the motor body and the lead screw pair structure, wherein the power output end of the lead screw pair structure is connected to the support tube.

[0023] By adopting the above technical solution, the motor body provides rotational driving force, and under the transmission action of the sprocket structure, it drives the screw pair structure to extend or retract the support tube relative to the tube shell body.

[0024] In summary, the present invention has the following beneficial effects: The system employs a base fixedly mounted to the vehicle floor, on which a linear drive unit is rotatably connected. The power output end of the linear drive unit has a support tube, and a linkage structure connects the linear drive unit and the base. When the linear drive unit drives the support tube to extend from its housing, the linkage structure transmits the axial movement of the support tube to the entire linear drive unit, causing it to rotate relative to the base. This allows the linear drive unit to gradually unfold from its initial retracted state to a perpendicular support posture, thus converting axial displacement into rotational motion. When the linear drive unit is fully extended, its housing will... The T-shaped rigid support structure greatly improves the stability and reliability of the device, significantly enhances the overall load-bearing rigidity and vibration resistance, and effectively suppresses chassis sway. In addition, during the process of the linear drive device flipping from the retracted state to the unfolded state relative to the base, the tension spring applies a restoring force in the unfolding direction to the linear drive device, thereby assisting the linear drive device to flip smoothly to the unfolded state. When the linear drive device is retracted, it only needs to overcome the preload of the tension spring to complete the retraction. The retraction method is simple and easy to operate. Furthermore, the entire device is hidden under the vehicle when retracted, without occupying interior space. It has the advantages of convenient operation, strong load-bearing capacity, and no space occupation when retracted. Attached Figure Description

[0025] Figure 1 This is a view of the linear drive device relative to the base in the usage state in a specific embodiment of the present invention.

[0026] Figure 2 This is the present invention. Figure 1 A longitudinal sectional view.

[0027] Figure 3 This is an exploded view of a specific embodiment of the present invention.

[0028] Figure 4 This is a view showing the fixed shaft and fixed gear separated in a specific embodiment of the present invention.

[0029] Figure 5 This is a view of the linear drive device in a stowed state relative to the base in a specific embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram of a specific embodiment of the present invention in which the main body of the tube shell is in an unfolded state relative to the base, and the supporting tube is not extended from the main body of the tube shell.

[0031] Figure 7 This is the present invention. Figure 6 A longitudinal sectional view.

[0032] Figure 8 This is the present invention. Figure 7 A magnified view of a portion of region A in the middle.

[0033] Figure 9 This is a partial cross-sectional view of a specific embodiment two of the present invention.

[0034] Figure 10 This is a schematic diagram of the shell body in a specific embodiment two of the present invention, in which the shell body is in an unfolded state relative to the base and the support tube is fully extended out of the shell body.

[0035] Figure 11 This is a view of the linear drive device in a retracted state relative to the base in a specific embodiment of the present invention.

[0036] Figure 12 This is a partial cross-sectional view of a specific embodiment of the present invention with a second lubricating sleeve added.

[0037] In the diagram: 1. Base; 11. Fixed shaft; 111. Positioning rib; 12. Fixed gear; 121. Shaft hole; 122. Positioning slot; 13. Rotating shaft; 14. Mounting part; 2. Linear drive device; 21. Motor body; 22. Sprocket structure; 23. Tube shell body; 231. Screw pair structure; 232. Protective frame; 2321. Clearance hole; 233. Second lubrication sleeve; 24. Guide plate; 25. First shaft; 251. First transmission gear 26. Wheel; 26. Second shaft; 261. Second transmission gear; 27. Manual crank; 3. Support tube; 31. Pin hole; 32. Stop; 4. Tension spring; 5. Rack; 6. Sliding sleeve; 61. First lubrication sleeve; 7. Connecting rod; 71. First hinge; 72. Second hinge; 8. Extension tube; 81. Through hole; 82. Pin; 83. Clamp; 84. Protective sleeve; 9. Support plate; 91. Bottom support; 92. Side support; 93. L-shaped connector. Detailed Implementation

[0038] The invention will now be further described with reference to the accompanying drawings. Specific Implementation Example 1 A type of RV lift, such as Figures 1-5 As shown, the device includes a base 1 fixedly mounted on the bottom of the vehicle and a linear drive device 2 rotatably connected to the base 1. The linear drive device 2 includes a tube housing 23, and a support tube 3 is provided at the power output end of the linear drive device 2. A linkage structure is provided between the linear drive device 2 and the base 1. When the linear drive device 2 drives the support tube 3 to switch between an extended state and a retracted state relative to the tube housing 23, the support tube 3 is linked with the base 1 through the linkage structure, and drives the linear drive device 2 to flip between an unfolded state and a retracted state relative to the base 1. The tube housing 23 in the unfolded state supports the base 1. A tension spring 4 is connected between the linear drive device 2 and the base 1. The tension spring 4 has a tendency to drive the linear drive device 2 to flip relative to the base 1 in the unfolding direction. The linear drive device 2 includes a motor body 21 and a support tube 3. The main body 23 contains a lead screw pair structure 231 and a sprocket structure 22 that is connected between the motor body 21 and the lead screw pair structure 231. The power output end of the lead screw pair structure 231 is connected to the support tube 3. The motor body 21 provides rotational driving force and, under the transmission action of the sprocket structure 22, drives the lead screw pair structure 231 to extend or retract the support tube 3 relative to the main body 23. In addition, in this embodiment, the end of the support tube 3 away from the linear drive device 2 is connected to a support plate 9. The rack 5 is fixedly connected to the support plate 9 on the side near the support plate 9 through an L-shaped connector 93. The support plate 9 includes a bottom support portion 91 and side support portions 92 located on both sides of the bottom support portion 91 and bent upward. The bottom support portion 91 and the side support portion 92 of the support plate 9 are used to achieve multi-angle support for the ground, increase the contact area between the support plate 9 and the ground, and thus improve the support stability of the device for the vehicle.

[0040] like Figures 1-3 and Figure 5 As shown, the linkage structure includes a rack 5, a gear assembly, and a fixed gear 12. The rack 5 is connected to the output end of the linear drive device 2. The gear assembly is mounted on the tube housing body 23. The fixed gear 12 is anti-rotatingly connected to the base 1, and the axis of the fixed gear 12 is coaxial with the rotation center axis of the linear drive device 2. The rack 5 meshes with the fixed gear 12 through the gear assembly to drive the linear drive device 2 to rotate relative to the base 1 between the unfolded and retracted states with the axis of the fixed gear 12 as the rotation center. The linear drive device 2 drives the support... When the support tube 3 retracts, the rack 5 contacts and meshes with the gear assembly. If the linear drive device 2 drives the support tube 3 to continue retracting, the support tube 3 drives the rack 5 to mesh with the fixed gear 12 through the gear assembly. Since the gear assembly is mounted on the tube body 23, the last gear of the gear assembly revolves around the fixed gear 12, thereby causing the linear drive device 2 to rotate relative to the base 1 in the retraction direction with the gear axis as the rotation center. When the linear drive device 2 drives the support tube 3 to gradually extend from the retracted state, the rack 5 also meshes with the fixed gear 12 through the gear assembly, thereby realizing the rotation of the linear drive device 2 relative to the base 1 in the unfolding direction with the gear axis as the rotation center. The gear assembly includes a first transmission gear 251 and a second transmission gear 261 that mesh with each other. A first shaft portion 25 and a second shaft portion 26 are fixedly provided on the outer wall of the tube body 23. The first transmission gear 251 is rotatably mounted on the first shaft portion 25, and the second transmission gear 261 is rotatably mounted on the second shaft portion 26. The linear drive device 2 drives the rack 5 to mesh with the first transmission gear 251. The two ends of the second transmission gear 261 mesh with the first transmission gear 251 and the fixed gear 12, respectively. In this embodiment, a protective frame 232 is fixed on the main body 23 of the tube shell. The protective frame 232 surrounds the fixed gear 12, the first transmission gear 251 and the second transmission gear 261. The protective frame 232 has a clearance hole 2321 corresponding to the rack 5. When the vehicle is in motion, the protective frame 232 can effectively prevent hard objects such as stones from hitting the fixed gear 12, the first transmission gear 251 and the second transmission gear 261, which could cause damage to the gears.

[0041] like Figure 1 and Figures 3-4As shown, a fixed shaft 11 is fixedly connected to the base 1, and a linear drive device 2 is rotatably connected to the fixed shaft 11. A fixed gear 12 is coaxially and anti-rotatingly connected to the end of the fixed shaft 11, fixing the fixed shaft 11 to the base 1 and rotatably connecting the linear drive device 2 to the fixed shaft 11. Simultaneously, the fixed gear 12 is coaxially and anti-rotatingly connected to the end of the fixed shaft 11, ensuring that the axis of the fixed shaft 11 coincides with the axis of the fixed gear 12. The common axis of the fixed shaft 11 and the fixed gear 12 serves as the rotation center axis of the linear drive device 2 relative to the base 1, effectively preventing jamming due to interference caused by the misalignment of the fixed shaft 11 and the fixed gear 12 when the linear drive device 2 rotates relative to the base 1; the main body 2 of the tube shell... A guide plate 24 is fixed along the length direction. The rack 5 slides and guides the guide plate 24. The addition of the guide plate 24 improves the consistency of the translation direction of the rack 5, thereby improving the precision and stability of the device operation and ensuring the accuracy of the angle of rotation of the linear drive device 2 relative to the base 1. In this embodiment, the fixed gear 12 has a shaft hole 121 corresponding to the fixed shaft 11. The fixed shaft 11 is inserted and engaged with the fixed gear 12 through the shaft hole 121. The side wall of the fixed shaft 11 near the fixed gear 12 is integrally provided with a positioning rib 111. The inner wall of the shaft hole 121 of the fixed gear 12 is connected to the positioning rib 111 and has a positioning groove 122. The positioning rib 111 and the positioning groove 122 are engaged to prevent rotation.

[0042] The basic working principle of this embodiment is as follows: The linear drive device 2 drives the support tube 3 to retract, so that the rack 5 and the gear assembly come into contact and mesh. If the linear drive device 2 drives the support tube 3 to continue to retract, the support tube 3 drives the rack 5 to mesh with the fixed gear 12 through the gear assembly. Since the gear assembly is installed on the tube shell body 23, the last gear of the gear assembly revolves around the fixed gear 12, thereby driving the entire linear drive device 2 to rotate relative to the base 1 in the retraction direction with the axis of the gear as the rotation center. When the linear drive device 2 drives the support tube 3 to gradually extend from the retracted state, the rack 5 also meshes with the fixed gear 12 through the gear assembly, thereby realizing that the entire linear drive device 2 rotates relative to the base 1 in the unfolding direction with the axis of the gear as the rotation center. Specific Implementation Example 2 A type of RV lift, such as Figures 6-11As shown, the difference between this embodiment and specific embodiment one is that: the tube shell body 23 is rotatably connected to the base 1 via the rotating shaft 13. The linkage structure includes a sliding sleeve 6 and a connecting rod 7. The sliding sleeve 6 is disposed on the tube shell body 23. The extension direction of the connecting rod 7 is set at an angle to the translation direction of the sliding sleeve 6. The end of the support tube 3 away from the tube shell body 23 is provided with a stop part 32, which cooperates with the stop of the sliding sleeve 6. The connecting rod 7 has a first hinge part 71 and a second hinge part 72. The base 1 has a mounting part 14. The first hinge part 71 of the connecting rod 7 is hinged to the sliding sleeve 6, and the second hinge part 72 of the connecting rod 7 is hinged to the mounting part 14. The rotation center axis of the second hinge part 72 is eccentrically set with the axis of the rotating shaft 13. The sliding sleeve 6 is axially fixed with a first lubricating sleeve 61. The first lubricating sleeve 61 is made of polytetrafluoroethylene material. The first lubricating sleeve 61 made of polytetrafluoroethylene material has an extremely low coefficient of friction and good self-lubrication. The lubrication effectively improves the smoothness of the sliding sleeve 6 sliding along the axial direction of the tube body 23. The sliding sleeve 6 is mounted on the tube body 23 via the first lubrication sleeve 61. The addition of the first lubrication sleeve 61 improves the smoothness of the axial sliding of the sliding sleeve 6 on the tube body 23 and avoids noise caused by excessive friction when the sliding sleeve 6 slides relative to the tube body 23. In this embodiment, the tube body 23, the support tube 3, the first lubrication sleeve 61, and the sliding sleeve 6 are all designed as polygonal columnar structures. In this embodiment, they are designed as rectangular or square columnar structures. In addition, in this embodiment, the linear drive device 2 has a manual crank 27. One end of the manual crank 27 is exposed on the outer surface of the linear drive device 2, and the other end of the manual crank 27 is connected to the output shaft of the motor body 21. When the motor body 21 is de-energized, the rotation of the manual crank 27 can be replaced by turning the external wrench to replace the rotational driving force of the motor body 21. Figure 12 As shown, in some embodiments, a second lubrication sleeve 233 can be tightly inserted into the end of the tube body 23. The second lubrication sleeve 233 is made of polytetrafluoroethylene (PTFE). The second lubrication sleeve 233 made of PTFE has an extremely low coefficient of friction and good self-lubricating properties. In addition, the second lubrication sleeve 233 has a guiding and limiting function, which can effectively improve the smoothness of the axial sliding of the support tube 3 relative to the tube body 23 and the anti-tilting ability, protect the contact surface between the support tube 3 and the tube body 23, reduce noise during operation, achieve the purpose of dry lubrication, and also have a dustproof effect.

[0044] like Figures 6-7 and Figures 9-11As shown, an adjustable-length extension tube 8 is installed at the end of the support tube 3 away from the base 1. A support plate 9 is provided at the end of the extension tube 8 away from the tube shell body 23. The support plate 9 includes a bottom support portion 91 and side support portions 92 located on both sides of the bottom support portion 91 and bent upwards. This allows adjustment of the extension length of the extension tube 8 relative to the support tube 3. Simultaneously, the bottom support portion 91 and side support portions 92 of the support plate 9 provide multi-angle support to the ground, increasing the contact area between the support plate 9 and the ground, thereby improving the stability of the device for supporting the vehicle. The extension tube 8 is inserted into the support tube 3, and the support tube 3 has several pin holes 31. The extension tube 8 is spaced apart along its length. The tube has several through holes 81, and pins 82 are inserted through the pin holes 31 and the corresponding through holes 81 and fixed by clamps 83. The extension of the tube 8 to the end of the support tube 3 is adjusted to a predetermined position, and then the pins 82 are inserted from the pin holes 31 into the corresponding through holes 81 and fixed by clamps 83. In this embodiment, the tube 8 is covered with several protective sleeves 84. The protective sleeves 84 are stacked sequentially along the length of the tube 8. The multiple protective sleeves 84 are stacked end to end along the length of the tube 8 to cover the through holes 81 of the tube 8 and to prevent dust.

[0045] The other structures in this embodiment are the same as those in Specific Embodiment 1, and will not be described again here.

[0046] The basic principle of this embodiment is as follows: In use, the linear drive device 2 drives the support tube 3 to extend relative to the tube shell body 23 to provide support. At this time, the end of the linear drive device 2 away from the support tube 3 abuts against the base 1. When it is necessary to fold and store the linear drive device 2 relative to the base 1, the linear drive device 2 drives the support tube 3 to gradually retract into the tube shell body 23, so that the stop part 32 at the end of the support rod contacts the sliding sleeve 6. When the linear drive device 2 drives the support rod to continue to move inward into the tube shell body 23 with a tendency to retract, since the end of the linear drive device 2 away from the support tube 3 abuts against the base 1, under the action of the connecting rod 7, the tube shell body 23 is forced to rotate around the pivot 13 as the rotation center to the side away from the base 1. During the rotation process, the connecting rod 7 drives the sliding sleeve 6 to slide axially on the tube shell body 23, avoiding the situation where the sliding sleeve 6 and the tube shell body 23 interfere with each other and get stuck when the tube shell body 23 rotates. When in use, the linear drive device 2 can drive the support tube 3 to extend for vertical support, increasing the load-bearing capacity of the vehicle body. In addition, the device uses the stop 32 at the end of the support tube 3 to push the sliding sleeve 6 to slide axially on the tube shell body 23. Under the linkage of the connecting rod 7, the linear drive device 2 is automatically folded and stored relative to the base 1. The storage method is simple and easy to operate. In addition, the entire device is hidden under the vehicle when stored, without occupying space inside the vehicle. Furthermore, by setting the rotation center axis of the second hinge part 72 of the connecting rod 7 eccentrically with the axis of the rotating shaft 13, the device allows the support tube 3 to be retracted into the tube shell body 23 until the stop 32 contacts the sliding sleeve 6. When the support tube 3 continues to retract into the tube shell body 23, the stop 32 of the support tube 3 can continue to push the sliding sleeve 6 towards the base 1, forcing the linear drive device 2 to rotate relative to the base 1 in the storage direction with the rotating shaft 13 as the rotation center.

[0047] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A RV lifter, comprising a base (1) fixedly installed on the bottom of the vehicle and a linear drive device (2) rotatably connected to the base (1), the linear drive device (2) comprising a tube shell body (23), and a support tube (3) provided at the power output end of the linear drive device (2), characterized in that: A linkage structure is provided between the linear drive device (2) and the base (1). When the linear drive device (2) drives the support tube (3) to switch between the extended state and the retracted state relative to the tube shell body (23), the support tube (3) is linked with the base (1) through the linkage structure, and drives the linear drive device (2) to flip and switch between the unfolded state and the retracted state relative to the base (1). The tube shell body (23) in the unfolded state is supported and cooperated with the base (1). A tension spring (4) is connected between the linear drive device (2) and the base (1), and the tension spring (4) has a tendency to cause the linear drive device (2) to rotate relative to the base (1) in the unfolding direction.

2. The RV lift according to claim 1, characterized in that: The linkage structure includes a rack (5), a gear assembly, and a fixed gear (12). The rack (5) is connected to the output end of the linear drive device (2). The gear assembly is mounted on the tube shell body (23). The fixed gear (12) is anti-rotating connected to the base (1), and the axis of the fixed gear (12) is coaxial with the rotation center axis of the linear drive device (2). The rack (5) meshes with the fixed gear (12) through the gear assembly to drive the linear drive device (2) to rotate relative to the base (1) between the unfolded state and the retracted state with the axis of the fixed gear (12) as the rotation center.

3. A motorhome lift according to claim 2, characterized in that: The gear assembly includes a first transmission gear (251) and a second transmission gear (261) that mesh with each other. The outer wall of the tube shell body (23) is fixed with a first shaft portion (25) and a second shaft portion (26). The first transmission gear (251) is rotatably mounted on the first shaft portion (25), and the second transmission gear (261) is rotatably mounted on the second shaft portion (26). The linear drive device (2) drives the rack (5) to mesh with the first transmission gear (251). The two ends of the second transmission gear (261) mesh with the first transmission gear (251) and the fixed gear (12) respectively.

4. A motorhome lift according to claim 2, characterized in that: A fixed shaft (11) is fixedly connected to the base (1), the linear drive device (2) is rotatably connected to the fixed shaft (11), and the fixed gear (12) is coaxially and anti-rotationally connected to the end of the fixed shaft (11).

5. A motorhome lift according to claim 2, characterized in that: The main body (23) of the tube shell is fixedly provided with a guide plate (24) along the length direction, and the rack (5) is guided and slidably engaged with the guide plate (24).

6. A motorhome lift according to claim 1, characterized in that: The main body (23) of the tube shell is rotatably connected to the base (1) via a rotating shaft (13). The linkage structure includes a sliding sleeve (6) and a connecting rod (7). The sliding sleeve (6) is disposed on the main body (23). The extension direction of the connecting rod (7) is set at an angle to the translation direction of the sliding sleeve (6). The end of the support tube (3) away from the main body (23) of the tube shell is provided with a stop (32). The stop (32) cooperates with the sliding sleeve (6) for a stop. The connecting rod (7) has a first hinge part (71) and a second hinge part (72). The first hinge part (71) is rotatably connected to the sliding sleeve (6) and the first hinge part (71) is rotatably connected to the base (1). The rotation center axis of the second hinge part (72) is eccentrically set with respect to the axis of the rotating shaft (13).

7. A motorhome lift according to claim 6, characterized in that: The sliding sleeve (6) is axially fixed with a first lubricating sleeve (61), and the sliding sleeve (6) is disposed on the tube shell body (23) through the first lubricating sleeve (61).

8. A motorhome lift according to claim 1, characterized in that: An adjustable length extension tube (8) is installed at one end of the support tube (3) away from the base (1). A support plate (9) is provided at one end of the extension tube (8) away from the tube shell body (23). The support plate (9) includes a bottom support (91) and side support (92) located on both sides of the bottom support (91) and bent upward.

9. A motorhome lift according to claim 8, characterized in that: The extended tube (8) is inserted into the support tube (3), and the support tube (3) has several pin holes (31). The extended tube (8) has several through holes (81) spaced apart along its length. Pins (82) are inserted into the pin holes (31) and the corresponding through holes (81) and are fixed by clamps (83).

10. A motorhome lift according to any one of claims 1-9, characterized in that: The linear drive device (2) includes a motor body (21), a lead screw pair structure (231) disposed in the tube shell body (23), and a sprocket structure (22) that is connected between the motor body (21) and the lead screw pair structure (231). The power output end of the lead screw pair structure (231) is connected to the support tube (3).

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