Double-layer trackless type expanding large terrace motor home

Abstract

The utility model discloses a double-layer trackless type expanding large terrace touring car which comprises a lower-layer box body, an upper-layer box body, expanding box bodies and a terrace mechanism, the upper-layer box body is arranged in the lower-layer box body in a lifting mode, and the expanding box bodies are arranged on the two sides of the lower-layer box body in a telescopic mode. The terrace mechanism is rotationally arranged on the top of the expansion box body, and the terrace mechanism is driven to be unfolded through a rotary driving device; a lifting device is arranged in the lower-layer box body and used for driving the upper-layer box body to ascend and descend. An expanding mechanism is arranged on the inner wall of the expanding box body, a transmission device is arranged in the lower-layer box body, and the transmission device is in linkage with the expanding mechanism, so that the transmission device drives the expanding box body to extend into or extend out of the lower-layer box body. The linkage expansion structure is redesigned, so that intelligent operations such as automatic loading and unloading, automatic expansion, automatic control and the like of the double-layer trackless expansion large-terrace motor home are met.

Description

Technical Field

[0001] This utility model relates to the technical field of RVs, and in particular to a double-decker trackless extended terrace RV. Background Technology

[0002] Currently, double-decker motorhomes primarily employ a multi-stage expansion system using transverse guide rails. The bottom not only requires multiple guide rails for support during expansion, but also necessitates the manual installation of numerous support devices to mitigate the risk of bending and breakage of the guide rails, hinges, and other load-bearing components after expansion. In summary, motorhome assembly involves redundant mechanical structures and requires manual installation of various components. Therefore, the redundant mechanical structure complicates assembly, increases weight, and the manual installation process results in a lack of automation, wasting customers' time and increasing their operating costs.

[0003] To avoid redundant mechanical structures and manual installation, a double-decker trackless expandable terrace motorhome was developed through various scheme layouts, simulations, and analyses. By abandoning the transverse guide rail device and redesigning the linkage expansion device, which is combined with the support device linkage mechanism, the double-decker trackless expandable terrace motorhome achieves intelligent operation such as automatic loading and unloading, automatic expansion, and automatic control, realizing automation, unmanned operation, and lightweight design. This reduces manufacturing costs for enterprises and accelerates operational efficiency, thereby reducing overall operating costs. Utility Model Content

[0004] The technical problem to be solved by this utility model embodiment is to provide a double-layer trackless expandable large terrace caravan, which abandons the transverse guide rail device and redesigns the linkage expansion device to solve the problems of mechanical structure redundancy and manual installation, and meets the requirements of automatic loading and unloading, automatic expansion and automatic control of the double-layer trackless expandable large terrace caravan.

[0005] To achieve the above objectives, this utility model discloses a double-layer trackless expandable large terrace RV, including a lower box, an upper box, an expandable box, and a terrace mechanism. The upper box is vertically mounted on the lower box. The expandable boxes are a pair and are retractably mounted on both sides of the lower box. The terrace mechanism is swayingly mounted on the top of the expandable box and is driven to unfold by a rotation drive device.

[0006] The lower box is equipped with a lifting device for driving the upper box to rise and fall.

[0007] An extension mechanism is provided on the inner wall of the expansion box, and a transmission device is provided in the lower box. The extension mechanism is linked by the transmission device to extend or retract, so that the expansion box extends into or out of the lower box.

[0008] Furthermore, it also includes a self-unloading mechanism, which is installed on the lower box body. The self-unloading mechanism includes a support frame and an unloading guide rail. The support frame is a pair and is telescopically installed on the side walls at both ends of the lower box body. The support frame is telescopically installed inside the support mechanism so that the support mechanism can be lowered to support the support frame. The unloading guide rail is installed at the bottom of the lower box body. The chassis of the transport vehicle is provided with a number of guide wheels at intervals along the length direction, which slide and cooperate with the inner side of the unloading guide rail.

[0009] Furthermore, the bottom of the expansion box is provided with a first folding bottom plate and a second folding bottom plate. One side of the first folding bottom plate is hinged to the lower edge of the expansion box, one side of the second folding bottom plate is hinged to the lower edge of the lower box, and the other side of the first folding bottom plate is hinged to the other side of the second folding bottom plate.

[0010] Furthermore, the bottom of the lower housing is provided with an arching mechanism, which includes an arching rack and an arching guide wheel. The arching rack is slidably mounted on the lower housing, and the arching guide wheel is rotatably mounted on the second folding bottom plate. The top surface of the arching rack is an inclined plane, and the inclined plane of the arching rack slides in cooperation with the arching guide wheel. The transmission device links the arching rack to move horizontally, so that the second folding bottom plate is lifted up by the inclined plane.

[0011] Furthermore, the lifting device includes several lifting rods, steel cables, and a lifting drive device. The lifting rods are respectively located at opposite corners of the upper housing. Several guide wheels are rotatably arranged on the upper part of the inner wall of the lower housing. The steel cables are wound around the guide wheels. The lifting drive device is fixedly installed on the lower housing. One end of the steel cable is fixedly connected to the lifting rod, and the other end is fixedly connected to the telescopic end of the lifting drive device, so that the lifting drive device drives the steel cables to pull the upper housing up and down.

[0012] Furthermore, the transmission device includes a lifting plate and a traction head. The lifting plate is slidably disposed on the side wall of the lower box, and the traction head is disposed on the lifting plate and linked with the extension mechanism. The lifting plate is driven by the transmission drive device to move the traction head up and down, thereby linking the extension box to extend into or out of the lower box.

[0013] Furthermore, the terrace mechanism includes several railings and several flipping mechanisms. The railings are respectively installed on the outer side of the top surface of the expansion box and are swayingly connected to the expansion box. The flipping mechanisms are respectively installed on the upper part of the expansion box and drive the railings to swing up and down.

[0014] Furthermore, the upper part of the expansion box is provided with a terrace floor, which is hinged to the lower box. The terrace floor is driven by an opening and closing drive device to swing up and down and open and close with the upper part of the expansion box.

[0015] Furthermore, it also includes a wing-opening device, which includes a pair of wing-opening plates that are hinged to the side wall of the upper housing and are driven to swing up and down by a wing-opening drive device.

[0016] Furthermore, the bottom surface of the first folding floor is hinged with a first leg, the first folding floor and the second folding floor are hinged with a second leg, and the second leg and the first leg are hinged with a straight arm.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This application abandons the traditional transverse guide rail device and redesigns a linkage expansion device. This device, combined with the support device linkage mechanism, enables intelligent operation of the double-layer trackless expansion terrace RV, including automatic loading and unloading, automatic expansion, and automatic control. This achieves automation, unmanned operation, and lightweight design for the double-layer trackless expansion terrace RV. On the one hand, it helps reduce manufacturing costs for enterprises; on the other hand, it accelerates operational efficiency, thereby reducing overall operating costs. This has profound significance for cost reduction and efficiency improvement in the display vehicle industry. Attached Figure Description

[0019] Figure 1 This is a simplified diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the RV in its retracted state.

[0021] Figure 3 This is a schematic diagram of the expanded structure of the upper box.

[0022] Figure 4 A schematic diagram of the extended configuration of the RV;

[0023] Figure 5 To illustrate the overall structure of the extended mechanism, see Schematic Diagram I;

[0024] Figure 6 Schematic diagram II of the overall structure of the extended mechanism;

[0025] Figure 7 To show Figure 6 A schematic diagram of the structure of part A in the diagram;

[0026] Figure 8 This is a schematic diagram of the structure of the first and second legs;

[0027] Figure 9 This is a schematic diagram of the overall structure of the terrace mechanism;

[0028] Figure 10 To show Figure 9 A schematic diagram of the structure of part B in the diagram;

[0029] Figure 11 This is a schematic diagram of the overall structure of the self-unloading mechanism;

[0030] Figure 12 To show Figure 8 A schematic diagram of section C in the diagram. Detailed Implementation

[0031] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0032] Reference Figure 1 , Figure 2 As shown, a double-layer trackless extendable terrace RV includes a lower compartment 1, an upper compartment 2, an extendable compartment 3, a terrace mechanism 4, a self-unloading mechanism 5, and a wing-opening device 6. The upper compartment 1 is vertically mounted on the lower compartment 1, and the wing-opening device 6 is mounted on the upper compartment 2. The extendable compartments 3 are a pair and are retractably mounted on both sides of the lower compartment 1. The terrace mechanism 4 is mounted on the extendable compartment 3. The self-unloading mechanism 5 is mounted at the bottom of the lower compartment 1 and cooperates with the chassis 20 of the transport vehicle so that the transport vehicle can transport the RV to a designated location.

[0033] Reference Figure 2 , Figure 11As shown, specifically, the self-unloading mechanism 5 includes a support frame 51 and an unloading guide rail 52. The support frame 51 is a pair and is telescopically mounted on the side walls at both ends of the lower housing 1. Specifically, the upper and lower parts of the support frame 51 are respectively provided with an upper outer guide rail 511 and a lower outer guide rail 512. The upper and lower sides of the lower housing 1 are respectively provided with an upper inner guide rail 11 and a lower inner guide rail 12 that slide in cooperation with the upper outer guide rail 11 and the lower outer guide rail 12. Furthermore, an extension drive device 13 is provided inside the lower housing 1, thereby driving the support frame 51 to move outward. A support foot 53 is telescopically mounted inside the support frame 51, and supports... A support drive device is fixedly installed inside the support frame 51. The support foot 53 is fixedly connected to the telescopic end of the support drive device. When the support frame 51 extends out of the lower box 1, the support drive device drives the support foot 53 to move downward until the support foot 53 directly contacts the ground, thereby using the support frame 51 to support the lower box. The unloading guide rail 52 is set at the bottom of the lower box 1. Several guide wheels 54 are arranged at intervals along the length direction on the chassis 20 of the transport vehicle, which slide and cooperate with the inner side of the unloading guide rail 52. When the support foot contacts the top surface, the transport vehicle is driven away from the RV to separate the RV from the transport vehicle, thereby realizing the self-unloading function.

[0034] In this embodiment, the unloading guide rail 52 consists of two crossbeams arranged in layers, with the opposite surfaces between the crossbeams forming an inclined plane. The longitudinal section of the guide wheel 54 is an isosceles trapezoid, so that the guide wheel slides along the inclined plane of the crossbeam during the process of the transport vehicle leaving the RV, reducing the friction between the unloading guide rail 52 and the chassis of the transport vehicle, and facilitating the separation of the transport vehicle from the RV.

[0035] The aforementioned extension drive device 13 and support drive device can be any of a hydraulic cylinder, an electric cylinder, or an electric push rod, and will not be described again here.

[0036] Reference Figure 1 , Figure 3As shown, a lifting device 7 is installed inside the lower housing 1. The lifting device 7 includes lifting rods 71, steel cables 72, and a lifting drive device 73. Preferably, four sets of lifting rods 71 ​​are installed, respectively located at diagonal positions inside the upper housing 2. C-groove guide rails that slide with the lifting rods 71 ​​are installed inside the lower housing 1. The lifting drive device 73 is fixedly installed inside the lower housing 1. In this embodiment, the lifting drive device 73 is preferably a hydraulic cylinder. Several guide wheels 74 are installed on the upper part of the inner wall of the lower housing 1. The steel cables 72 are wound around the guide wheels 74, and one end of the steel cables 72 is connected to the lifting rods 71. The lower part of the rod 71 is fixedly connected, and the other end is fixedly connected to the telescopic end of the lifting drive device 73. When the telescopic end of the lifting drive device 73 retracts, it pulls the steel rope 72 to drive the lifting rod 71 to slide upward along the C-groove guide rail, thereby lifting the upper box 2 upward and expanding it, so that the lower box 1 and the upper box 2 form a double-layer RV. When the telescopic end of the lifting drive device 73 extends, the upper box 2 gradually slides downward under its own weight. In this embodiment, the size of the upper box 2 is slightly larger than the size of the lower box, so that when the upper box 2 retracts, it covers the lower box 1.

[0037] Combination Figure 4 As shown, the wing-opening device 6 includes wing-opening plates 61, which are a pair of plates hinged to the side wall of the upper housing 2. A wing-opening drive device 62 is hinged to the upper housing 2. In this embodiment, the wing-opening drive device 62 is preferably a hydraulic cylinder, whose telescopic end is hinged to the wing-opening plates. The wing-opening drive device 62 drives the wing-opening plates 61 to swing up and down, thereby opening or retracting the wing-opening plates. This allows the wing-opening plates 61 to provide shade or rain protection for users on the terrace mechanism 4, greatly improving the user experience.

[0038] In this embodiment, the wing-opening device 6 is not limited to using one wing-opening plate 61, but can use several wing-opening plates, which are hinged together, and multiple sets of wing-opening drive devices 62 are added, so as to realize the automatic unfolding or folding of multiple wing-opening plates, thereby greatly increasing the sunshade or rainproof area.

[0039] Reference Figure 2 , Figure 5 As shown, the bottom of the expansion box 3 is provided with a first folding base plate 31 and a second folding base plate 32. One side of the first folding base plate 31 is hinged to the lower edge of the expansion box 3, and one side of the second folding base plate 32 is hinged to the lower edge of the lower box 1. The other side of the first folding base plate 31 is hinged to the other side of the second folding base plate 32, so that the first folding base plate 31 and the second folding base plate 32 can be folded together.

[0040] In this embodiment, an expansion mechanism 8 is provided on the inner wall of the expansion box 3, and a transmission device 9 is provided in the lower box 1. The expansion mechanism 8 includes a first expansion link 81 and a second expansion link 82. The first expansion link 81 and the second expansion link 82 are a pair and are arranged symmetrically from top to bottom. The first expansion link 81 and the second expansion link 82 are hinged together. The other end of the first expansion link 81 is hinged to the side wall of the expansion box 3, and the other end of the second expansion link 82 is hinged to the side wall of the lower box 1. The transmission drive device 9 includes an expansion drive device, which is preferably a motor. Its telescopic end is hinged to the second expansion link, thereby driving the expansion mechanism 8 to extend or extend the expansion box 3 into the lower box 1 through the transmission device 9.

[0041] Reference Figure 8 As shown, in this embodiment, the upper part of the expansion box 3 is provided with a terrace floor 33, which is hinged to the lower box 1. An opening and closing drive device 34 is hinged to the lower box 1. In this embodiment, the opening and closing drive device 34 is preferably a hydraulic cylinder, with its telescopic end hinged to the top plate 33. This allows the opening and closing drive device 34 to drive the terrace floor 33 to swing up and down, opening and closing with the upper part of the expansion box 3.

[0042] When the expansion box 3 is unfolded, the opening and closing drive device 34 drives the top floor plate 33 to swing upward until the top floor plate 33 and the upper part of the expansion box 3 are closed, thereby creating a foothold space on the top of the expansion box 3 through the top floor plate 33. When the expansion box 3 is to be retracted, the opening and closing drive device 34 drives the top floor plate 33 to swing downward so that the expansion box 3 can be retracted into the lower box 1 without obstruction.

[0043] Combination Figure 6 , Figure 7 As shown, in another embodiment, the transmission device 9 includes a lifting plate 91, a traction head 92, and a transmission drive device 93. The lifting plate 91 is slidably disposed on the side wall of the lower box 1, and the traction head 92 is disposed on the lifting plate 91. In this embodiment, the expansion mechanism 8 also includes an expansion push rod 83, one end of which is hinged to the first expansion connecting rod 81 and the second expansion connecting rod 82, and the other end is hinged to the end of the traction head 92. The transmission drive device 93 is fixedly installed on the lower box 1. In this embodiment, the transmission drive device 93 is preferably a motor, and a lifting gear is fixedly installed on its output shaft. The lifting plate 91 is vertically provided with a toothed groove 911 that meshes with the lifting gear. Thus, the transmission drive device 93 drives the lifting plate 91 to move the traction head 92 up and down, thereby linking the expansion mechanism 8 to drive the expansion box 3 to extend into or out of the lower box 1.

[0044] Furthermore, an arching mechanism 10 is provided at the bottom of the lower housing 1. The arching mechanism 10 includes an arching rack 101 and an arching guide wheel 102. The arching rack 101 is slidably mounted on the lower housing 1, and the arching guide wheel 102 is rotatably mounted on the second folding bottom plate 32. The top surface of the arching rack 101 is an inclined surface, which slides in cooperation with the arching guide wheel 102. A worm gear 103 is rotatably mounted on the lower part of the lower housing 1. A worm wheel 104 meshes between the worm gear 103 and the arching rack 101. A second worm gear 104 is also rotatably mounted on the lower housing 1. A first transmission sprocket 105 is provided with a linkage gear that meshes with the worm gear 103, while a second transmission sprocket is provided on the lifting gear. A transmission chain 106 is tensioned between the first and second transmission sprockets, so that the transmission drive device 93 drives the lifting plate 91 to rise and fall while simultaneously rotating the worm gear 103. This causes the screw to link the arched rack 101 to slide horizontally, so that the second folding bottom plate 32 is lifted by the inclined surface of the arched rack 101. This facilitates the pull of several extension push rods 83 to retract the extension box 3 into the lower box 1.

[0045] Furthermore, a pair of virtual displacement grooves are provided in the middle of the traction head 92, and limiting shafts that slide with the virtual displacement grooves are fixedly provided on the lifting plate 91, so that when the arching rack 101 arches the first folding floor 31 and the second folding floor 32, the virtual displacement groove of the traction head 92 moves upward along the limiting shaft a certain distance under the push of the extension push rod 83. In this embodiment, the length of the virtual displacement groove is the same as the arching stroke of the first folding floor and the second folding floor, so as to limit the virtual displacement length of the transmission device of the traction head, thereby ensuring that the extension box cannot be fully closed or cannot be extended flat due to the large length deviation of the extension push rod 83.

[0046] Combination Figure 8 , Figure 12 As shown, further, the bottom surface of the first folding floor 31 is hinged with a first leg 34, the first folding floor 31 and the second folding floor 32 are hinged with a second leg 35, and the second leg 35 and the first leg 34 are hinged with a straight arm 36.

[0047] The second leg 35 is hinged with a first sickle arm 351 and a second sickle arm 352. The other end of the first sickle arm 351 is hinged to the first folding floor 31, and the other end of the second sickle arm 352 is hinged to the second folding floor 32. One end of the straight arm 36 is hinged to the upper part of the first leg 34, and the other end is hinged to the first sickle arm 351. Thus, when the first folding floor 31 and the second folding floor 32 are folded, the first sickle arm 351 and the second sickle arm 352 gradually retract under the action of the first folding floor 31 and the second folding floor 32. This causes the straight arm to pull the first leg 34 to fold to the left under the action of the first sickle arm 351, ensuring that the first folding floor 31 and the second folding floor 32 can be folded normally.

[0048] When the first folding floor 31 and the second folding floor 32 are unfolded, the first sickle arm 351 and the second sickle arm 352 extend outward until the first folding floor 31 and the second folding floor 32 are flat. At the same time, the straight arm 36, driven by the first sickle arm 351, pulls the first leg 34 back to the center, so that the first leg 34 and the second leg 35 contact the ground and support the first folding floor 31 and the second folding floor 32, ensuring the stability of the first folding floor 31 and the second folding base plate 32.

[0049] Reference Figure 4 , Figure 9 As shown, the terrace mechanism 4 includes several railings 41 and several flipping mechanisms 42. The railings 42 are respectively arranged around the outer side of the top surface of the expansion box 3. Several bearing seats are respectively provided on the outer periphery of the top surface of the expansion box. The lower part of the railing 41 is provided with a rotating shaft and is swayingly connected to the bearing seat. The flipping mechanisms are respectively arranged on the upper part of the expansion box and are linked with the railings 42. In this embodiment, each railing 41 corresponds to one flipping mechanism 42, so that the flipping mechanism 42 drives the railing 41 to swing up and down.

[0050] Combination Figure 10As shown, the flipping mechanism 42 further includes a flipping gear 421 and a flipping rack 422. The two ends of the rotating shaft at the lower part of the fence extend outwards and are fixedly connected to the flipping gear 421. The flipping rack 422 is slidably disposed on the upper side wall of the expansion box and meshes with the flipping gear for transmission. A pair of flipping sliding holes are provided on the flipping rack 422 along its length. A pair of positioning pins are spaced apart along the length of the side wall of the expansion box 3, so that the flipping sliding holes of the flipping rack 422 slide in cooperation with the positioning pins. A retractable flipping push rod 423 is provided on the upper part. The flipping push rod 423 is axially connected to the flipping rack 422. In this embodiment, the flipping push rod 423 is preferably an electric push rod, but this embodiment is not limited to electric push rods. It can also be a hydraulic push rod, a pneumatic push rod, etc. In this way, the flipping push rod 423 drives the flipping rack 422 to move horizontally, so that the fence 421 swings up and down under the linkage of the flipping rack 422. The bottom surface of the fence 41 has a flange so that when the fence is flipped upward 90°, the flange is in stop engagement with the bearing seat.

[0051] Specifically, when the expansion box 3 is extended outward, the flip push rod drives the fence 41 to swing upward, thereby unfolding the fence 41 so that the top surface of the expansion box 3 forms an open balcony. At the same time, the fence 421 can prevent the user from falling. Before the expansion box 3 is retracted, the flip push rod 423 drives the fence 41 to swing downward, thereby folding the fence 41 so that the expansion box 3 can be retracted into the lower box 1.

[0052] Of course, the above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They cannot be used to limit the protection scope of this utility model. All modifications made in accordance with the spirit of the main technical solution of this utility model should be covered within the protection scope of this utility model.

Claims

1. A double-decker trackless extended terrace motorhome, characterized in that, It includes a lower box (1), an upper box (2), an extension box (3), and a terrace mechanism (4). The upper box (2) is vertically mounted on the lower box (1). The extension boxes (3) are a pair and are telescopically mounted on both sides of the lower box (1). The terrace mechanism (4) is swayed on the top of the extension box (3) and is driven to unfold by a rotation drive device (41). The lower box (1) is equipped with a lifting device (7) for driving the upper box (2) to rise and fall. An extension mechanism (8) is provided on the inner wall of the extension box (3), and a transmission device (9) is provided in the lower box (1). The extension mechanism (8) is moved in conjunction with the transmission device (9) to extend or retract, so that the extension box (3) extends into or out of the lower box (1).

2. The double-decker trackless extended terrace RV according to claim 1, characterized in that, It also includes a self-unloading mechanism (5), which is installed on the lower box (1). The self-unloading mechanism (5) includes a support frame (51) and an unloading guide rail (52). The support frame (51) is a pair and is telescopically installed on the side walls at the front and rear ends of the lower box. The support frame (51) is telescopically installed with a support mechanism (53) inside, so that the support mechanism can be lowered to support the support frame (51). The unloading guide rail (52) is installed at the bottom of the lower box (1). The chassis (20) of the transport vehicle is provided with a number of guide wheels (54) that slide and cooperate with the inner side of the unloading guide rail (52) along the length direction.

3. The double-decker trackless extended terrace RV according to claim 1, characterized in that, The bottom of the expansion box (3) is provided with a first folding bottom plate (31) and a second folding bottom plate (32). One side of the first folding bottom plate (31) is hinged to the lower edge of the expansion box (3), one side of the second folding bottom plate (32) is hinged to the lower edge of the lower box (1), and the other side of the first folding bottom plate (31) is hinged to the other side of the second folding bottom plate (32).

4. The double-decker trackless extended terrace RV according to claim 3, characterized in that, The bottom of the lower box (1) is provided with an arching mechanism (10). The arching mechanism (10) includes an arching rack (101) and an arching guide wheel (102). The arching rack is slidably disposed on the lower box. The arching guide wheel (102) is rotatably disposed on the second folding bottom plate (32). The top surface of the arching rack (101) is an inclined surface. The inclined surface of the arching rack (101) is slidably engaged with the arching guide wheel (102). The arching rack (101) is moved horizontally by the transmission device (9) so that the second folding bottom plate (32) is lifted up by the inclined surface.

5. The double-decker trackless extended terrace RV according to claim 1, characterized in that, The lifting device (7) includes several lifting rods (71), steel ropes (72), and a lifting drive device (73). The lifting rods (71) are respectively located at the diagonal corners of the upper box. Several guide wheels (74) are rotatably arranged on the upper part of the inner wall of the lower box (1). The steel ropes (72) are wound around the guide wheels (74). The lifting drive device (73) is fixedly installed on the lower box (1). One end of the steel rope (72) is fixedly connected to the lifting rods (71), and the other end is fixedly connected to the telescopic end of the lifting drive device (73), so that the lifting drive device (73) drives the steel rope to pull the upper box (2) up and down.

6. The double-decker trackless extended terrace RV according to claim 1, characterized in that, The transmission device (9) includes a lifting plate (91) and a traction head (92). The lifting plate (91) is slidably disposed on the side wall of the lower box (1). The traction head (92) is disposed on the lifting plate (91) and is linked with the extension mechanism (8). The lifting plate is driven by the transmission drive device (93) to move the traction head (92) up and down, thereby linking the extension box (3) to extend into or out of the lower box (1).

7. The double-decker trackless extended terrace RV according to claim 1, characterized in that, The terrace mechanism (4) includes several railings (41) and several flipping mechanisms (42). The railings (41) are respectively enclosed on the outer side of the top surface of the expansion box (3) and are respectively swayed and connected to the expansion box (3). The flipping mechanisms (42) are respectively set on the upper part of the expansion box (3) and drive the railings (41) to swing up and down through the flipping mechanisms (42).

8. The double-decker trackless extended terrace RV according to claim 1, characterized in that, The upper part of the expansion box (3) is provided with a terrace floor (33), which is hinged to the lower box (1). The terrace floor (33) is driven to swing up and down and open and close with the upper part of the expansion box (3) by the opening and closing drive device (34).

9. A double-decker trackless extended terrace RV according to claim 1, characterized in that, It also includes a wing-opening device (6), which includes wing-opening plates (61). The wing-opening plates (61) are a pair that are hinged to the side wall of the upper box (2) and are driven to swing up and down by a wing-opening drive device (62).

10. A double-decker trackless extended terrace motorhome according to claim 3, characterized in that, The bottom surface of the first folding floor (31) is hinged with a first leg (34), the first folding floor (31) and the second folding floor (32) are hinged with a second leg (35), and the second leg (35) and the first leg (34) are hinged with a straight arm (36).

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