Single-powered full-roof lifting mechanism of recreational vehicle

Abstract

Provided is a single-powered full-roof lifting mechanism of a recreational vehicle. The single-powered full-roof lifting mechanism comprises a first swing member, a second swing member, third swing members, fourth swing members, a first connecting member, a second connecting member, first support members, second support members, guide members, and a driving element. The first swing member, the third swing members, and the first connecting member are fixedly connected. The second swing member, the fourth swing members, and the second connecting member are fixedly connected. An upper end of each first support member and an upper end of each second support member are separately rotatably connected to a top cover, a middle portion of each first support member and a middle portion of each second support member are rotatably connected to a third swing member and a fourth swing member, respectively, and a lower end of each first support member and a lower end of each second support member are separately rotatably connected to a guide member and can move relative to the guide member. The driving element drives the first swing member and the second swing member to simultaneously swing and finally drives the first support members and the second support members to move to achieve lifting of the top cover. By using the technical solution of the prevent invention, lifting of the whole top cover can be completed using only one motor for driving. The magnitude of the driving torque during lifting is reasonable, and the technical solution involves simple operations, is highly reliable and low in cost, and has broad market prospects.

Description

RV single-power full-lift roof mechanism

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 15, 2024, with application number 202410053115.0, and invention name “RV single-power full-lifting roof mechanism”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of recreational vehicles, and more particularly to a roof-lifting mechanism for a recreational vehicle. Background Art

[0003] With the advancement of technology and the improvement of people's living standards, more and more people are turning to RVs for travel and vacation. The main advantage of RVs is that they are not restricted by external transportation, accommodation, and dining conditions. They can comprehensively solve transportation, accommodation, and dining problems during travel, giving people a sense of home, while also being very economical.

[0004] However, a major issue with RVs (especially the most popular C-type self-drive RVs in China) is limited space. Fixed-size cabins, in particular, are constrained by various factors, resulting in limited mobility and a poor user experience. Consequently, expandable cabins have been designed. This expansion can be achieved both in width and height. The most common method for height expansion is to raise the roof using a lifting mechanism, thereby increasing the vertical space within the cabin.

[0005] Most current roof-lifting mechanisms use a scissor-type support arm structure connected in an X shape by a pin shaft, such as Chinese patents CN 216268926 U and CN 218316439 U. However, in the initial state (i.e., when the two support arms are stacked and close together), this structure is close to the dead center position relative to the direction of the driving force. As a result, the initial driving force arm of the prime mover (electric push rod, hydraulic cylinder, etc.) is very small and the torque it bears is very large, which can easily cause premature failure and damage to the structure. At the same time, the X-shaped structure has poor stability and low load-bearing capacity, which can easily cause the RV roof to swing and shift laterally during use. Especially in windy weather, it is very easy to damage the roof structure. In addition, the use of multiple power sources makes it difficult to synchronously control the lifting process, which is cumbersome to operate and costly.

[0006] Chinese patent CN 110733401 A discloses a RV roof-lifting structure, which uses a bidirectional threaded screw 20 to drive and raise and lower a long arm 18 hinged to a slide 19, thereby achieving the roof-lifting function. Although it can achieve synchronous lifting of four lifting mechanisms at the front and rear ends of the roof, this structure still has the problem of being close to the dead point position relative to the direction of the driving force in the initial state and the initial driving force arm being very small. The motor and structural parts are easily damaged, and the practicality is not strong.

[0007] There is also a solution in the prior art that an electric push rod is fixed near each of the four corners of the car, and the top cover is directly pushed by the four electric push rods to achieve the roof raising. Although this solution has reasonable force on the top cover and occupies less space, it is difficult to control the four push rods synchronously. At the same time, the forces on the four push rods during the roof raising process are likely to interfere with each other, causing damage to the structure or motor, and if one motor is damaged, the entire device will not work. Therefore, it has the defects of high cost and low reliability.

[0008] Summary of the Invention

[0009] In view of this, the present invention provides a single-power full-lifting mechanism for a motorhome, which has the advantages of achieving the entire roof lift with a single power, large load-bearing capacity, reasonable driving torque during the entire lifting process, and the ability to achieve manual and automatic integration. It can at least partially solve the problems existing in the prior art. In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows:

[0010] A single-power full-lifting roof mechanism for a recreational vehicle comprises a first swinging member, a second swinging member, a third swinging member, a fourth swinging member, a first connecting member, a second connecting member, a first supporting member, a second supporting member, a guide member, and a driving element;

[0011] The upper end of the first swinging member is fixedly connected to the first connecting member, and the first connecting member is fixedly connected to the lower end of the third swinging member near both ends. The two ends of the first connecting member are rotatably supported on the top of the carriage. The upper end of the third swinging member is rotatably connected to the middle part of the first supporting member. The lower end of the first supporting member is rotatably connected to the guide member and can move relative to the guide member. The upper end of the first supporting member is rotatably connected to the top cover.

[0012] The upper end of the second swinging member is fixedly connected to the second connecting member, and the second connecting member is fixedly connected to the lower end of the fourth swinging member near both ends. The two ends of the second connecting member are rotatably supported on the top of the carriage. The upper end of the fourth swinging member is rotatably connected to the middle part of the second supporting member. The lower end of the second supporting member is rotatably connected to the guide member and can move relative to the guide member. The upper end of the second supporting member is rotatably connected to the top cover.

[0013] The guide member is fixed on the top of the carriage, and the driving element can drive the first swing member and the second swing member to swing inward or outward at the same time.

[0014] Furthermore, the driving element includes a bidirectional threaded screw, a first nut, a second nut and a motor, the lower end of the first swinging member is rotatably connected to the first nut, the first nut is threadedly connected to the first rotational direction segment of the bidirectional threaded screw, the lower end of the second swinging member is rotatably connected to the second nut, the second nut is threadedly connected to the second rotational direction segment of the bidirectional threaded screw, and the motor is connected to one end of the bidirectional threaded screw.

[0015] Furthermore, the first connecting member and the second connecting member are torsion shaft structures and penetrate the entire width direction of the carriage, and are rotatably supported on the top of the carriage through bearing seats at both ends.

[0016] Furthermore, there are two third swing members arranged in parallel, there are two fourth swing members arranged in parallel, there are two first support members arranged in parallel, and there are two second support members arranged in parallel.

[0017] Furthermore, the upper ends of the first support member and the second support member are rotatably connected to the top cover through an adapter respectively.

[0018] Furthermore, rolling bearings are respectively installed at the lower ends of the first support member and the second support member, and are in contact with the guide member through the rolling bearings.

[0019] As a preferred embodiment, the driving element includes a bidirectional threaded screw, a first nut, a second nut, a motor and a transmission member, the lower end of the first swinging member is rotatably connected to the first nut, the first nut is threadedly connected to the first rotational section of the bidirectional threaded screw, the second nut is fixed to one end of the transmission member and is threadedly connected to the second rotational section of the bidirectional threaded screw, the other end of the transmission member is rotatably connected to the lower end of the second swinging member, and the motor is connected to one end of the bidirectional threaded screw close to the first rotational section.

[0020] Furthermore, the transmission member is a square tube, the second nut has a rectangular parallelepiped shape and is located inside the transmission member, and the axial length of the second nut is longer than that of the first nut.

[0021] Furthermore, the motor includes a self-contained reducer and is slidably connected to a side wall in the vehicle compartment.

[0022] Furthermore, the bidirectional threaded screw passes through the reducer and has an overhanging portion, and the overhanging portion is detachably connected to a hand-cranking mechanism.

[0023] As a preferred embodiment, the driving element includes a motor, a transmission member, a gear, and a worm gear reducer. The transmission member includes a first transmission member and a second transmission member. One end of the first transmission member and the second transmission member are respectively rotatably connected to the lower end of the first swinging member and the second swinging member. The other ends of the first transmission member and the second transmission member are respectively engaged with the upper end and the lower end of the gear through a rack. The motor drives the gear to rotate by connecting one end of the worm shaft of the worm gear reducer.

[0024] Furthermore, the other end of the worm shaft of the worm gear reducer extends out and is detachably connected to a hand-cranking mechanism.

[0025] Compared with the prior art, the present invention has the following obvious advantages:

[0026] 1. Only one motor is needed to drive the entire top cover, which is easy and convenient to operate, with a simple and reliable structure and low cost.

[0027] 2. A driving mechanism is used to drive the two swinging parts to swing inward or outward at the same time to realize the rotation of the two torsion shafts, and finally drive the top cover to rise and fall through the intermediate mechanism. The driving force arm remains basically unchanged during the entire lifting process, roughly the vertical height of the first swinging part (or the second swinging part). The driving force is reasonable in size and changes smoothly.

[0028] 3. It has both electric lifting and manual lifting functions, which increases the reliability of the system and avoids the embarrassing situation that the lifting mechanism cannot fall due to motor damage and cannot be returned in the field. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is a schematic structural diagram of a lifting mechanism in a raised position according to an embodiment of the present invention;

[0030] FIG2 is a schematic structural diagram of a lifting mechanism when it is raised (without the top cover) according to an embodiment of the present invention;

[0031] FIG3 is a schematic structural diagram of a lifting mechanism in a lowered position according to an embodiment of the present invention (without the top cover);

[0032] FIG4 is a schematic diagram of the overall structure of the first swinging member, the third swinging member and the first connecting member according to the first embodiment of the present invention;

[0033] 5 is a schematic diagram of the overall structure of the second swinging member, the fourth swinging member and the second connecting member according to the first embodiment of the present invention;

[0034] FIG6 is a schematic diagram of a partial structure of a driving element according to an embodiment of the present invention;

[0035] FIG7 is a schematic diagram of a partial structure of a driving element according to a second embodiment of the present invention;

[0036] FIG8 is an exploded view of the second nut and the transmission member according to the second embodiment of the present invention;

[0037] FIG9 is a schematic structural diagram of a driving element according to a third embodiment of the present invention. DETAILED DESCRIPTION

[0038] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Embodiment 1: As shown in FIG1 to FIG3 , a single-power full-lifting roof mechanism 100 for a motorhome includes:

[0041] The invention comprises a first swinging member 110, a second swinging member 120, a third swinging member 130, a fourth swinging member 140, a first connecting member 150, a second connecting member 160, a first supporting member 170, a second supporting member 180, a guide member 190 and a driving element 300;

[0042] The upper end of the first swinging member 110 is fixedly connected to the first connecting member 150. The first connecting member 150 is fixedly connected to the lower end of the third swinging member 130 near both ends. The two ends of the first connecting member 150 are rotatably supported on the top of the carriage 500. The upper end of the third swinging member 130 is rotatably connected to the middle portion of the first support member 170. The lower end of the first support member 170 is rotatably connected to the guide member 190 and can move relative to the guide member 190. The upper end of the first support member 170 is rotatably connected to the top cover 600.

[0043] The upper end of the second swing member 120 is fixedly connected to the second connecting member 160. The second connecting member 160 is fixedly connected to the lower end of the fourth swing member 140 near both ends. The two ends of the second connecting member 160 are rotatably supported on the top of the carriage 500. The upper end of the fourth swing member 140 is rotatably connected to the middle portion of the second support member 180. The lower end of the second support member 180 is rotatably connected to the guide member 190 and can move relative to the guide member 190. The upper end of the second support member 180 is rotatably connected to the top cover 600.

[0044] The guide member 190 is fixed to the top of the carriage 500 , and the driving element 300 can drive the first swing member 110 and the second swing member 120 to swing inward or outward at the same time.

[0045] It is worth noting that, in order to highlight the core technical solution of the present invention, only a portion of the carriage 500 and the top cover 600 is illustrated, and the structure is also simplified. As shown in Figures 4 and 5, preferably, the first swing member 110, the third swing member 130, and the first connecting member 150 are fixed by welding, and the second swing member 120, the fourth swing member 140, and the second connecting member 160 are fixed by welding, and the angle between the first swing member 110 and the third swing member 130 is 110° to 130°, preferably 112° to 116°, and the angle between the second swing member 120 and the fourth swing member 140 is 110° to 130°, preferably 112° to 116°.

[0046] As shown in Figure 6, as a preferred embodiment, the driving element 300 includes a bidirectional threaded screw 310 (omitted because it is too long), a first nut 320, a second nut 330 and a motor 340. The lower end of the first swinging member 110 is rotatably connected to the first nut 320, and the first nut 320 is threadedly connected to the first rotational section 311 of the bidirectional threaded screw 310. The lower end of the second swinging member 120 is rotatably connected to the second nut 330, and the second nut 330 is threadedly connected to the second rotational section 312 of the bidirectional threaded screw 310. The motor 340 is connected to one end of the bidirectional threaded screw 310, and force is transmitted through the bidirectional threaded screw. The structure is simple and it also has a self-locking function.

[0047] Furthermore, the motor 340 includes its own reducer 341 and is connected to a side wall of the carriage 500 for sliding up and down movement. The motor sliding setting is to compensate for the slight vertical distance change when the first swing member 110 and the second swing member 120 swing, thereby avoiding structural interference.

[0048] As a preferred embodiment, a bidirectional threaded screw 310 passes through a reducer 341 and has an overhang 313, to which a hand crank mechanism is detachably connected. The hand crank mechanism is provided to avoid the embarrassing situation of the roof raising mechanism being unable to be lowered due to motor damage, thus being unable to return to the field. If the roof is not lowered, the wind resistance is very high and there is a great safety risk. In addition, if the roof is not lowered, it is often impossible to pass through height-restricted areas.

[0049] Furthermore, the first connecting member 150 and the second connecting member 160 are torsion shaft structures and run through the entire width direction of the carriage 500. They are rotatably supported on the top of the carriage 500 at both ends by bearing seats 200. The bearing seats 200 are preferably sliding bearing seats to further reduce the vertical height.

[0050] Furthermore, there are two third swing members 130 disposed in parallel, there are two fourth swing members 140 disposed in parallel, there are two first support members 170 disposed in parallel, and there are two second support members 180 disposed in parallel.

[0051] As a preferred embodiment, the upper ends of the first support member 170 and the second support member 180 are rotatably connected through the adapter 210 and the top cover 600 respectively. The advantage of providing the adapter 210 is that it is convenient to adopt modular installation, saving installation and adjustment time, while increasing the connection strength with the top cover and making the force on the top cover more uniform. The adapter can be manufactured as a whole or in parts, preferably using aluminum alloy material and opening multiple weight-reducing holes on it.

[0052] As a preferred embodiment, rolling bearings 220 are respectively installed at the lower ends of the first support member 170 and the second support member 180, and are in contact with the guide member 190 through the rolling bearings 220 to further reduce friction. The rolling bearings 220 are preferably rubber-coated bearings, and the guide member 190 is preferably divided into four separate components to facilitate manufacturing and installation while saving costs.

[0053] Embodiment 2: As shown in Figures 7 and 8, the parts that are the same as those in Embodiment 1 will not be repeated. The difference is that the driving element 300 also includes a transmission member 350 (omitted because it is too long), and the second nut 330 is fixed to one end of the transmission member 350 and threadedly connected to the second rotational section 312 of the bidirectional threaded screw 310. The other end of the transmission member 350 is rotatably connected to the lower end of the second swinging member 120, and the motor 340 is connected to one end of the bidirectional threaded screw 310 close to the first rotational section 311. The use of this structure does not affect the force transmission, but it can greatly shorten the length of the bidirectional threaded screw 310, making it convenient for the processing and manufacturing of the bidirectional threaded screw.

[0054] Preferably, the transmission member 350 is a square tube, the second nut 330 has a rectangular shape and is located inside the transmission member 350, the axial length of the second nut 330 is longer than that of the first nut 320, and the second nut 330 is set longer to guide the bidirectional threaded screw to prevent deflection during force transmission.

[0055] Embodiment 3: As shown in FIG9 , the same parts as those in embodiment 1 are not described in detail. The difference is that the driving element 300 includes a motor 340, a transmission member 350, a gear 360, and a worm gear reducer 370. The transmission member 350 includes a first transmission member 351 and a second transmission member 352. One end of the first transmission member 351 and the second transmission member 352 are respectively rotatably connected to the first swing member 110 and the second swing member 120. The lower end of the first transmission member 351 and the other end of the second transmission member 352 are respectively meshed with the upper and lower ends of the rack and gear 360, the motor 340 is connected to one end of the worm shaft of the worm gear reducer 370, and the gear 360 is connected to one end of the turbine shaft of the worm gear reducer 370. The motor 340 drives the gear 360 to rotate, and the gear 360 rotates while driving the first transmission member 351 and the second transmission member 352 to move inward or outward at the same time. The use of a rack and pinion mechanism facilitates the use of a modular design. In addition, the first transmission member 351 and the second transmission member 352 can adopt a narrow square tube structure, thereby further shortening the distance between the transmission member and the side of the car body and improving space utilization. The purpose of using a turbine worm reducer is to slow down, self-lock and facilitate the use of a hand-cranked mechanism.

[0056] As a preferred embodiment, the other end of the worm shaft of the worm gear reducer 370 extends out and is detachably connected to a hand-cranking mechanism.

[0057] In addition, the driving element can also be other forms of structure, such as a hydraulic cylinder, an air cylinder or an electric push rod, as long as it can transmit power to the lower ends of the first swing member and the second swing member. However, since the hydraulic cylinder and the air cylinder cannot self-lock, the manual function cannot be realized. At the same time, the hydraulic cylinder and the cylinder have complex structures, the hydraulic cylinder has the risk of oil leakage, and the pneumatic cylinder also has the disadvantage of high noise. Although the electric push rod can self-lock, it is generally an integral purchased part and cannot realize the manual function. Therefore, these solutions are not used as preferred solutions.

[0058] The working principle of the single-power full-lift roof mechanism of the RV of the present invention is as follows:

[0059] When the top cover needs to be raised, the motor drives the bidirectional threaded screw or gear to rotate through the reducer, thereby driving the first swinging member and the second swinging member to swing inward, and further driving the first support member and the second support member to rotate and rise relative to the guide member, and finally driving the top cover to rise until it reaches the maximum height.

[0060] When the top cover needs to be lowered, the motor is driven in reverse. At this time, the entire mechanism moves in the opposite direction along the above-mentioned method. No further details will be given. When the motor fails, the above-mentioned raising and lowering processes can be manually realized through the hand-crank mechanism, avoiding the embarrassing situation that the top cover cannot be lowered due to motor damage and cannot be returned to the field.

[0061] By adopting the roof lifting mechanism of the present invention, the driving force arm remains basically unchanged during the entire lifting process, which is the vertical distance from the top of the car to the lower end of the first swing member (or the second swing member). Therefore, the driving force is reasonable in size, changes smoothly, and is not easy to damage the motor or other structural parts.

[0062] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0063] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention.

[0064] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A single-power full-lifting roof mechanism for a recreational vehicle, characterized in that, It includes a first swinging member, a second swinging member, a third swinging member, a fourth swinging member, a first connecting member, a second connecting member, a first supporting member, a second supporting member, a guiding member and a driving element; The upper end of the first swinging member is fixedly connected to the first connecting member. The positions of the first connecting member near both ends are respectively fixedly connected to the lower ends of the third swinging members. Both ends of the first connecting member are rotatably supported on the top of the carriage. The upper end of the third swinging member is rotatably connected to the middle of the first supporting member. The lower end of the first supporting member is rotatably connected to the guiding member and can move relative to the guiding member. The upper end of the first supporting member is rotatably connected to the top cover; The upper end of the second swinging member is fixedly connected to the second connecting member. The positions of the second connecting member near both ends are respectively fixedly connected to the lower ends of the fourth swinging members. Both ends of the second connecting member are rotatably supported on the top of the carriage. The upper end of the fourth swinging member is rotatably connected to the middle of the second supporting member. The lower end of the second supporting member is rotatably connected to the guiding member and can move relative to the guiding member. The upper end of the second supporting member is rotatably connected to the top cover; The guiding member is fixedly arranged on the top of the carriage, and the driving element can drive the first swinging member and the second swinging member to swing inwards or outwards simultaneously.

2. The single-power full-lift top mechanism for a recreational vehicle according to claim 1, wherein The driving element includes a bidirectional threaded screw rod, a first nut, a second nut and a motor. The lower end of the first swinging member is rotatably connected to the first nut. The first nut is threadedly connected to the first helical section of the bidirectional threaded screw rod. The lower end of the second swinging member is rotatably connected to the second nut. The second nut is threadedly connected to the second helical section of the bidirectional threaded screw rod. The motor is connected to one end of the bidirectional threaded screw rod.

3. The single-power full-lifting roof mechanism for a recreational vehicle according to claim 1, wherein The first connecting member and the second connecting member are of a torsion shaft structure and run through the entire width direction of the carriage, and are respectively rotatably supported on the top of the carriage through bearing seats at both ends.

4. The single-power full-lifting roof mechanism for a motorhome according to claim 1, characterized in that, There are two third swinging members arranged in parallel, two fourth swinging members arranged in parallel, two first supporting members arranged in parallel, and two second supporting members arranged in parallel.

5. The single-power full-lifting roof mechanism for a recreational vehicle according to claim 1, characterized in that, The upper ends of the first supporting member and the second supporting member are respectively rotatably connected to the top cover through adapter pieces.

6. The single-power full-lifting roof mechanism for a recreational vehicle according to claim 1, wherein Rolling bearings are respectively installed at the lower ends of the first supporting member and the second supporting member, and are in contact and cooperation with the guiding member through the rolling bearings.

7. The single-power full-lifting roof mechanism for a recreational vehicle according to claim 1, characterized in that, The driving element includes a bidirectional threaded screw rod, a first nut, a second nut, a motor and a transmission member. The lower end of the first swinging member is rotatably connected to the first nut. The first nut is threadedly connected to the first helical section of the bidirectional threaded screw rod. The second nut is fixed to one end of the transmission member and is threadedly connected to the second helical section of the bidirectional threaded screw rod. The other end of the transmission member is rotatably connected to the lower end of the second swinging member. The motor is connected to one end of the bidirectional threaded screw rod near the first helical section.

8. The single-power full-lift roof mechanism for a recreational vehicle according to claim 7, wherein The transmission member is a square tube. The outer shape of the second nut is a cuboid and is located inside the transmission member. The axial length of the second nut is longer than that of the first nut.

9. The single-power full-lifting roof mechanism for a recreational vehicle according to claim 2 or 7, characterized in that The motor includes a built-in speed reducer and is slidably connected up and down to one side wall inside the carriage.

10. The single-power full-lift top mechanism for a recreational vehicle according to claim 9, characterized in that, The bidirectional threaded screw rod passes through the speed reducer and has an overhanging portion, and a hand-cranking mechanism is detachably connected to the overhanging portion.

11. The single-power full-lifting roof mechanism for a recreational vehicle according to claim 1, wherein The driving element includes a motor, a transmission member, a gear, and a worm and worm gear reducer. The transmission member includes a first transmission member and a second transmission member. One end of the first transmission member and the second transmission member are respectively rotatably connected to the lower ends of the first swinging member and the second swinging member. The other ends of the first transmission member and the second transmission member are respectively engaged with the upper end and the lower end of the gear through racks. The motor drives the gear to rotate by connecting one end of the worm shaft of the worm and worm gear reducer.

12. The single-power full-lifting roof mechanism for a recreational vehicle according to claim 11, characterized in that, The other end of the worm shaft of the worm and worm gear reducer extends out and is detachably connected with a hand-cranking mechanism.

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