A hydraulic support leveling device for RV

Abstract

The present invention discloses a hydraulic support and leveling device for a motorhome, and relates to the technical field of motorhomes. The hydraulic support and leveling device for a motorhome includes a frame for installing a carriage, and also includes a hydraulic support mechanism and a leveling assembly. The hydraulic support mechanism includes a hydraulic support leg, a hydraulic telescopic leg and a connecting piece. The hydraulic telescopic leg is connected to the frame through the connecting piece. The hydraulic support leg is fixedly connected to the telescopic end of the hydraulic telescopic leg, and the telescopic end of the hydraulic support leg faces the ground. The leveling assembly includes an adjustment balance pipe, a pressure sensor and a fixing piece. The adjustment balance pipe is installed on the frame. Pressure sensors are installed at both ends of the adjustment balance pipe. The pressure sensor is fixedly connected to the inner end wall of the adjustment balance pipe, and the fixing piece is connected between the adjustment balance pipe and the frame. The present application can stably support the carriage, reduce the shaking of the frame and the carriage, improve the stability of the frame, and help improve the comfort of the user.

Description

Technical Field

[0001] The invention relates to the technical field of recreational vehicles, and in particular to a hydraulic support and leveling device for recreational vehicles. Background Art

[0002] In today's society where the tourism economy is booming, RVs have become a popular means of transportation for traveling. The RV compartment is equipped with living facilities such as beds, cooking utensils, and televisions. When camping, people can rest, eat, and entertain in the compartment.

[0003] In the related art, a motorhome is disclosed, including a motorhome body, a driving cab is provided at the front of the motorhome body, a compartment is provided at the rear, the bottom of the compartment is installed on the chassis, a head-out bed is provided at the top front side of the compartment, and an escape hatch is opened between the front panel of the compartment and the driving cab.

[0004] With respect to the above-mentioned related technologies, the inventor believes that when people move around in the above-mentioned carriage, the carriage will shake, and the shaking of the carriage will reduce people's comfort. Summary of the invention

[0005] In order to improve the stability of the car body, the present application provides a hydraulic support and leveling device for a motorhome.

[0006] In the first aspect, the present application provides a hydraulic support and leveling device for a motorhome using the following technical solution:

[0007] A hydraulic support and leveling device for a motorhome comprises a frame for mounting a carriage, a hydraulic support mechanism and a leveling assembly, wherein the hydraulic support mechanism comprises a hydraulic support leg, a hydraulic telescopic leg and a connecting piece, wherein the hydraulic telescopic leg is connected to the frame via the connecting piece, wherein the hydraulic support leg is fixedly connected to the telescopic end of the hydraulic telescopic leg, wherein the telescopic end of the hydraulic support leg faces the ground, wherein the leveling assembly comprises an adjusting balance pipe, a pressure sensor and a fixing piece, wherein the adjusting balance pipe is mounted on the frame, pressure sensors are mounted at both ends of the adjusting balance pipe, wherein the pressure sensor is fixedly connected to the inner end wall of the adjusting balance pipe, and wherein the fixing piece is connected between the adjusting balance pipe and the frame.

[0008] By adopting the above technical solution, when the car body needs to be stabilized, the hydraulic telescopic legs are extended to push the hydraulic supporting legs away from the frame. The hydraulic supporting legs are extended to press against the ground, and the pressure of the pressure sensors at both ends of the balancing pipe is monitored to determine whether the frame is level. When the pressures of the pressure sensors at both ends of the balancing pipe are equal, the frame is level. With the support of the hydraulic supporting legs and the hydraulic telescopic legs, the shaking of the frame and the car body can be reduced, thereby improving the stability of the frame and helping to improve the comfort of the user.

[0009] Moreover, when the RV needs to move, the hydraulic support legs and the hydraulic telescopic legs are retracted onto the frame, so that the RV can move smoothly. The cooperation of the hydraulic support legs and the hydraulic telescopic legs also makes it easy to remove the frame and the carriage from the RV chassis, which is convenient and quick.

[0010] In a specific feasible implementation scheme, the frame includes a cross beam, a longitudinal beam and a double-layer floor plate, and there are a plurality of longitudinal beams and a plurality of cross beams. The cross beam is located below the longitudinal beam, and the cross beam is fixedly connected between the longitudinal beams. The double-layer floor plate is installed on the longitudinal beam, and the balancing pipe and fixings are installed on the double-layer floor plate. The cross beam and the longitudinal beam are fixedly connected to the hydraulic telescopic legs.

[0011] By adopting the above technical solution, the cross beam and the longitudinal beam are connected to each other to form a frame that can stably support the carriage. The double-layer floor is convenient for installing the balancing pipe and the carriage, so that the balancing pipe and the carriage can be stably installed on the frame, which is helpful for balancing. The double-layer floor can also protect the balancing pipe and the fixing parts to reduce damage to the balancing pipe.

[0012] In a specific feasible implementation scheme, the connecting parts include a connecting transverse plate, a connecting longitudinal plate, connecting bolts and connecting nuts. The connecting transverse plate and the connecting longitudinal plate are both fixedly connected to the outer wall of the hydraulic telescopic leg. The connecting transverse plate abuts the longitudinal beam, and the connecting longitudinal plate abuts the transverse beam. The connecting transverse plate and the connecting longitudinal plate are both provided with bolt through holes. The longitudinal beam and the transverse beam are both provided with through holes opposite to the bolt through holes. The connecting bolts are inserted into the bolt through holes and the through holes, and the connecting nuts are threadedly connected to the connecting bolts.

[0013] By adopting the above technical solution, the hydraulic telescopic legs can be fixed on the cross beam and the longitudinal beam at the same time by connecting the cross plates, connecting the longitudinal plates and the connecting bolts and connecting nuts, making the hydraulic telescopic legs more stable. Moreover, when the hydraulic telescopic legs are under pressure, the pressure can be transmitted to both the longitudinal beam and the cross beam, which helps the hydraulic telescopic legs to remain stable, thereby stably supporting the frame and the carriage.

[0014] In a specific feasible implementation scheme, the double-layer bottom plate includes an upper bottom plate, a lower bottom plate and a support frame, the support frame is fixedly connected between the upper bottom plate and the lower bottom plate, the lower bottom plate and the support frame are both inserted between two opposite longitudinal beams, the lower bottom plate is fixedly connected to the cross beam, the upper bottom plate is fixedly connected to the longitudinal beam, and the balancing pipe and fixings are both installed on the surface of the lower bottom plate facing the upper bottom plate.

[0015] By adopting the above technical solution, the lower base plate helps to smoothly install the balancing pipe. Moreover, when the balancing pipe is installed on the lower base plate, the upper base plate and the supporting frame can protect the balancing pipe, reduce the impact of foreign objects on the balancing pipe, and help reduce damage to the balancing pipe.

[0016] In a specific feasible implementation scheme, the balancing tube includes a closed tube, a slow-flow plug and a liquid. The closed tube is installed on a vehicle frame. The slow-flow plug and the liquid are both arranged in the closed tube. There are several slow-flow plugs, which are arranged in sequence along the axial direction of the closed tube. The peripheral wall of the slow-flow plug is fixedly connected to the inner peripheral wall of the closed tube. The slow-flow plug is provided with a flow hole. The pressure sensor is fixedly connected to the inner end wall of the closed tube.

[0017] By adopting the above technical solution, the closed tube can seal the liquid and reduce liquid leakage. When the heights of the two ends of the closed tube are different, the liquid will flow to the end of the closed tube with a lower height, so that the pressures measured by the pressure sensors at both ends of the closed tube are different. By adjusting the hydraulic support legs, the pressures measured by the pressure sensors at both ends of the closed tube are adjusted to be equal, and the frame and the carriage are adjusted to be horizontal. Several slow-flow plugs can separate the liquid into multiple sections, and the liquid can only flow through the flow holes on the slow-flow plugs. Therefore, when the liquid flows, a part of the impact force of the liquid impacts the slow-flow plug. The slow-flow plug can slow down the flow of the liquid, which helps to reduce the problem of damage to the pressure sensor and the closed tube due to excessive impact force of the liquid.

[0018] In a specific possible implementation scheme, the closed tube includes a flat plate, a tube body and a sealing plate for sealing the tube body, the flat plate abuts against the frame, the tube body is fixedly connected to the flat plate, both ends of the tube body are fixedly connected to the sealing plate, the pressure sensor and the flow slow-down plug are located in the tube body, the pressure sensor is fixedly connected to the sealing plate, the peripheral wall of the flow slow-down plug is fixedly connected to the peripheral wall of the tube body, and the fixing part is connected between the tube body and the frame.

[0019] By adopting the above technical solution, the surface of the plate is flat, which can be more stably abutted against the frame, and the contact area between the plate and the frame is larger, which helps to increase the friction between the closed tube and the frame, and further reduce the movement of the closed tube. The sealing plate can seal the liquid in the tube body, which helps to reduce liquid leakage.

[0020] In a specific feasible implementation scheme, the fixing part includes a compression arc block, a stopper and a fixing screw, the compression arc block abuts against the balancing tube, one end of the compression arc block is hinged to the frame, the other end of the compression arc block abuts against the frame, the stopper is fixedly connected to the compression arc block, the stopper abuts against the outer end wall of the balancing tube, the compression arc block is provided with a fixing hole, the frame is provided with a fixing screw hole opposite to the fixing hole, the fixing screw is inserted into the fixing hole and the fixing screw hole, and the fixing screw is threadedly connected to the hole wall of the fixing screw hole.

[0021] By adopting the above technical solution, when the fixing screw fixes the compression arc block on the frame, the compression arc block applies pressure to the balance tube, which can press the balance tube against the frame, helping to reduce the shaking of the frame. The block helps to limit the movement of the balance tube to both ends, helping to improve the stability of the balance tube.

[0022] In a specific possible implementation manner, a groove is provided on the outer side wall of the carriage, and the hydraulic support leg is arranged in the groove.

[0023] By adopting the above technical solution, the hydraulic support legs are retracted into the grooves, which helps to reduce scratches on the hydraulic support legs and can reduce adverse effects on the RV when the RV is traveling.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The present application can adjust the carriage to a horizontal level according to the pressure measured by the pressure sensors at both ends of the balancing pipe, and use hydraulic support legs and hydraulic telescopic legs to support the carriage, thereby reducing the shaking of the frame and the carriage, improving the stability of the frame, and helping to improve the comfort of the user;

[0026] 2. The balancing tube of the present application includes a closed tube, a slow-flow plug and a liquid. The slow-flow plug can slow down the flow of the liquid, which helps to reduce the problem of damage to the pressure sensor and the closed tube due to excessive impact force of the liquid;

[0027] 3. The closed tube of the present application includes a flat plate, a tube body and a sealing plate for closing the tube body, which helps to increase the friction between the closed tube and the frame and further reduce the movement of the closed tube. The sealing plate can seal the liquid in the tube body, which helps to reduce liquid leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a hydraulic support and leveling device for a motorhome in an embodiment of the present application.

[0029] Figure 2 It is a schematic diagram of the structure of the hydraulic support leg in an embodiment of the present application.

[0030] Figure 3 It is a front view of the hydraulic support and leveling device for a motor home in an embodiment of the present application.

[0031] Figure 4 yes Figure 3 Sectional view along line AA.

[0032] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0033] Figure 6It is a schematic diagram of the exploded structure of the hydraulic support leveling device for RV in the embodiment of the present application.

[0034] Figure 7 It is a cross-sectional view of the balancing pipe in the embodiment of the present application.

[0035] Figure 8 It is a schematic diagram of the exploded structure of the fixing member in the embodiment of the present application.

[0036] Fig. 9 yes Figure 8 Enlarged view of point C in the middle.

[0037] Description of reference numerals:

[0038] 1. Frame; 11. Crossbeam; 111. Through hole; 12. Longitudinal beam; 13. Double-layer bottom plate; 131. Upper bottom plate; 132. Lower bottom plate; 133. Support frame; 14. Fixing screw hole; 2. Hydraulic support leg; 3. Hydraulic telescopic leg; 4. Connecting piece; 41. Connecting cross plate; 411. Bolt through hole; 42. Connecting longitudinal plate; 43. Connecting bolt; 44. Connecting nut; 5. Balancing pipe; 51. Closed pipe; 511. Flat plate; 512. Pipe body; 513. Closing plate; 52. Slow-flow plug; 521. Through hole; 6. Pressure sensor; 7. Fixing piece; 71. Pressed arc block; 711. Fixing hole; 72. Block; 73. Fixing screw; 8. Groove. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-9 This application is described in further detail.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] The embodiment of the present application discloses a hydraulic support and leveling device for a motorhome.

[0042] Reference Figure 1 The hydraulic support and leveling device for a motorhome comprises a frame 1, a hydraulic support mechanism and a leveling assembly. The motorhome comprises a vehicle chassis and a carriage, the frame 1 is mounted on the vehicle chassis, and the hydraulic support mechanism, the leveling assembly and the carriage are all mounted on the frame 1.

[0043] Operate the hydraulic support mechanism to extend, and the hydraulic support mechanism contacts the ground. Continue to operate the hydraulic support mechanism and the leveling assembly to adjust the frame 1 and the vehicle compartment to be level. The hydraulic support mechanism can stably support the frame 1 and the vehicle compartment, and the user will feel more comfortable when moving in the vehicle compartment.

[0044] Reference Figure 1 The frame 1 includes a cross beam 11, a longitudinal beam 12 and a double-layer bottom plate 13. The cross beam 11 and the longitudinal beam 12 can be two, three or four, etc., and the cross beam 11 and the longitudinal beam 12 in this embodiment are both two. The longitudinal beam 12 is located above the cross beam 11, and the longitudinal beam 12 is welded to the cross beam 11. The two cross beams 11 are parallel to each other, the two longitudinal beams 12 are parallel to each other, and the longitudinal beam 12 is perpendicular to the cross beam 11.

[0045] The double-layer bottom plate 13 includes an upper bottom plate 131, a lower bottom plate 132 and a support frame 133. The lower bottom plate 132 and the support frame 133 are both located between the two longitudinal beams 12, the lower bottom plate 132 is riveted to the upper surface of the cross beam 11, and the support frame 133 is riveted to the upper surface of the lower bottom plate 132. The upper bottom plate 131 is located above the longitudinal beam 12, and the longitudinal beam 12 and the support frame 133 are both riveted to the upper bottom plate 131.

[0046] Reference Figure 1 The hydraulic support mechanism includes a hydraulic support leg 2, a hydraulic telescopic leg 3 and a connecting piece 4. The hydraulic support leg 2 and the hydraulic telescopic leg 3 are both electric hydraulic cylinders. There are four hydraulic telescopic legs 3 and four hydraulic support legs 2. The hydraulic telescopic legs 3 are all located below the longitudinal beam 12. Two hydraulic telescopic legs 3 form a group. Two cross beams 11 are located between the two groups of hydraulic telescopic legs 3. The two hydraulic telescopic legs 3 in the same group have opposite telescopic directions. The telescopic direction of the hydraulic telescopic legs 3 is the same as the length direction of the cross beam 11.

[0047] Reference Figure 1 and Figure 2 The hydraulic support leg 2 is welded to the telescopic end of the hydraulic telescopic leg 3, and the longitudinal beam 12 is located between the two opposite hydraulic support legs 2, and the telescopic end of the hydraulic support leg 2 faces the ground. A groove 8 is provided on the side wall of the carriage, and when the hydraulic telescopic leg 3 and the hydraulic support leg 2 are both retracted, the hydraulic support leg 2 retracts into the groove 8.

[0048] Reference Figure 3 A connecting piece 4 is installed on the outer shell of each hydraulic support leg 2.

[0049] Reference Figure 4 and Figure 5The connecting member 4 includes a connecting transverse plate 41, a connecting longitudinal plate 42, a connecting bolt 43 and a connecting nut 44. The connecting transverse plate 41 and the connecting longitudinal plate 42 are welded to the outer shell of the hydraulic support leg 2. The connecting transverse plate 41 abuts against the lower surface of the longitudinal beam 12, and the connecting longitudinal plate 42 abuts against the side wall of the cross beam 11. The connecting transverse plate 41 and the connecting longitudinal plate 42 are both provided with a plurality of bolt through holes 411, and the longitudinal beam 12 and the cross beam 11 are both provided with through holes 111.

[0050] Reference Figure 5 , move the hydraulic support leg 2, align the bolt through hole 411 with the through hole 111, then pass the connecting bolt 43 through the bolt through hole 411 and the through hole 111, and then thread the connecting nut 44 onto the connecting bolt 43, tighten the connecting nut 44, and the hydraulic telescopic leg 3 is fixed to the cross beam 11 and the longitudinal beam 12.

[0051] Reference Figure 6 and Figure 7 The leveling assembly is located between the upper base plate 131 and the lower base plate 132 , and the leveling assembly includes a balancing pipe 5 , a pressure sensor 6 and a fixing member 7 .

[0052] The balancing tubes 5 are installed on the upper surface of the lower base plate 132. There are two groups of balancing tubes 5, each group of balancing tubes 5 has two balancing tubes, the two balancing tubes 5 in each group are parallel to each other, and the two groups of balancing tubes 5 are perpendicular to each other, wherein the length direction of one group of balancing tubes 5 is the same as the telescopic direction of the hydraulic telescopic leg 3.

[0053] The balancing tube 5 includes a closed tube 51, a slow-flow plug 52 and a liquid. The closed tube 51 includes a flat plate 511, a tube body 512 and a sealing plate 513. The flat plate 511 abuts against the upper surface of the lower bottom plate 132. The tube body 512 is integrally connected to the upper surface of the flat plate 511. Both ends of the tube body 512 are integrally connected to a sealing plate 513, and the sealing plate 513 seals the tube body 512. The liquid and the slow-flow plug 52 are both located in the tube body 512. There can be multiple slow-flow plugs 52. In this embodiment, there are three slow-flow plugs 52. The peripheral walls of the three slow-flow plugs 52 are integrally connected to the inner peripheral wall of the tube body 512. The slow-flow plug 52 is provided with a plurality of through-flow holes 521, and the plurality of through-flow holes 521 are evenly distributed along the circumference of the slow-flow plug 52. The liquid in this embodiment is mercury.

[0054] The pressure sensor 6 is located in the tube body 512 . There is a pressure sensor 6 at each end of the tube body 512 . The pressure sensor 6 is bonded to the sealing plate 513 .

[0055] Reference Figure 8 and 9The fixing member 7 includes a compression arc block 71, a stopper 72 and a fixing screw 73. The compression arc block 71 is located above the tube body 512, and one end of the compression arc block 71 is hinged to the lower bottom plate 132. The other end of the compression arc block 71 is provided with a fixing hole 711, and the lower bottom plate 132 is provided with a fixing screw hole 14. The stopper 72 is welded to the side wall of the compression arc block 71, and the stopper 72 is located on the side of the sealing plate 513 away from the tube body 512, and the stopper 72 abuts against the sealing plate 513.

[0056] Rotate the arc-fixing block 71 to make the other end of the arc-fixing block 71 abut against the lower base plate 132, and the fixing screw hole 14 is opposite to the fixing hole 711. Then, insert the fixing screw 73 into the fixing screw hole 14 and the fixing hole 711. The fixing screw 73 is threadedly connected to the hole wall of the fixing screw hole 14. The arc-fixing block 71 presses the flat plate 511 against the lower base plate 132, and the stop block 72 presses the sealing plate 513, and the tube body 512 is fixed on the lower base plate 132.

[0057] The implementation principle of a hydraulic support and leveling device for a motor home in an embodiment of the present application is as follows: the car body is riveted to the frame 1 , and then the frame 1 is propped up using a jack.

[0058] Then, the hydraulic telescopic legs 3 are started to extend, and the hydraulic support legs 2 are pushed to both sides of the carriage. The hydraulic support legs 2 are started to extend again, and the hydraulic support legs 2 are in contact with the ground and prop up the frame 1 and the carriage.

[0059] Move the vehicle chassis to below the frame 1, start the hydraulic support legs 2 to shorten, make the frame 1 abut against the vehicle chassis, and fix the frame 1 on the vehicle chassis to complete the installation of the RV.

[0060] According to the pressure of the pressure sensors 6 at both ends of the tube body 512, the length of the hydraulic support leg 2 on one side of the car body is adjusted. When the pressures of the pressure sensors 6 at both ends of the tube body 512 are equal, the adjustment of the hydraulic support leg 2 is stopped. The hydraulic support leg 2 and the hydraulic telescopic leg 3 support the frame 1 and the car body.

[0061] When driving is required, the hydraulic support legs 2 are started to retract, and then the hydraulic telescopic legs 3 are started to retract, and the hydraulic support legs 2 are put into the grooves 8, and the RV can be driven forward.

[0062] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hydraulic support and leveling device for a motorhome, characterized in that: The invention comprises a vehicle frame (1) for mounting a vehicle body, and also comprises a hydraulic support mechanism and a leveling assembly, wherein the hydraulic support mechanism comprises a hydraulic support leg (2), a hydraulic telescopic leg (3) and a connecting piece (4), wherein the hydraulic telescopic leg (3) is connected to the vehicle frame (1) via the connecting piece (4), wherein the hydraulic support leg (2) is fixedly connected to the telescopic end of the hydraulic telescopic leg (3), wherein the telescopic end of the hydraulic support leg (2) faces the ground, and wherein the leveling assembly comprises a balance adjustment pipe (5), a pressure sensor (6) and a fixing piece (7), wherein the balance adjustment pipe (5) is mounted on the vehicle frame (1), and pressure sensors (6) are mounted at both ends of the balance adjustment pipe (5), wherein the pressure sensors (6) are mounted at both ends of the balance adjustment pipe (5), and wherein the pressure sensors (6) are mounted at both ends of the balance adjustment pipe (5). The pressure sensor (6) is fixedly connected to the inner end wall of the balancing tube (5); the fixing member (7) is connected between the balancing tube (5) and the frame (1); the balancing tube (5) comprises a closed tube (51), a slow-flow plugging piece (52) and a liquid; the closed tube (51) is installed on the frame (1); the slow-flow plugging piece (52) is arranged in the closed tube (51); there are a plurality of slow-flow plugging pieces (52); the slow-flow plugging pieces (52) are arranged in sequence along the axial direction of the closed tube (51); the peripheral wall of the slow-flow plugging piece (52) is fixedly connected to the inner peripheral wall of the closed tube (51); the slow-flow plugging piece (52) is provided with a flow hole (521); the pressure sensor (6) The frame (1) comprises a crossbeam (11), a longitudinal beam (12) and a double-layer floor plate (13), wherein the longitudinal beams (12) and the crossbeam (11) are both in plurality, wherein the crossbeam (11) is located below the longitudinal beam (12), wherein the crossbeam (11) is fixedly connected between the longitudinal beams (12), wherein the double-layer floor plate (13) is mounted on the longitudinal beam (12), wherein the balancing pipe (5) and the fixing member (7) are both mounted on the double-layer floor plate (13), wherein the crossbeam (11) and the longitudinal beam (12) are both fixedly connected to the hydraulic telescopic leg (3), wherein the double-layer floor plate (13) comprises an upper floor plate (131), a lower floor plate (132) and a supporting frame (133), wherein the balancing pipe (5) and the fixing member (7) are both mounted on the surface of the lower floor plate (132) facing the upper floor plate (131).

2. A hydraulic support and leveling device for a motorhome according to claim 1, characterized in that: The connecting member (4) comprises a connecting transverse plate (41), a connecting longitudinal plate (42), a connecting bolt (43) and a connecting nut (44); the connecting transverse plate (41) and the connecting longitudinal plate (42) are both fixedly connected to the outer wall of the hydraulic telescopic leg (3); the connecting transverse plate (41) abuts against the longitudinal beam (12); the connecting longitudinal plate (42) abuts against the cross beam (11); the connecting transverse plate (41) and the connecting longitudinal plate (42) are both provided with bolt through holes (411); the longitudinal beam (12) and the cross beam (11) are both provided with through holes (111) opposite to the bolt through holes (411); the connecting bolt (43) is inserted into the bolt through holes (411) and the through holes (111); the connecting nut (44) is threadedly connected to the connecting bolt (43).

3. The hydraulic support and leveling device for a motorhome according to claim 1, characterized in that: The support frame (133) is fixedly connected between the upper base plate (131) and the lower base plate (132); the lower base plate (132) and the support frame (133) are both inserted between two opposite longitudinal beams (12); the lower base plate (132) is fixedly connected to the cross beam (11); and the upper base plate (131) is fixedly connected to the longitudinal beam (12).

4. The hydraulic support and leveling device for a motorhome according to claim 1, characterized in that: The closed tube (51) comprises a flat plate (511), a tube body (512) and a sealing plate (513) for sealing the tube body (51); the flat plate (511) is abutted against the vehicle frame (1); the tube body (512) is fixedly connected to the flat plate (511); both ends of the tube body (512) are fixedly connected to the sealing plate (513); the pressure sensor (6) and the slow-flow plug (52) are located in the tube body (512); the pressure sensor (6) is fixedly connected to the sealing plate (513); the peripheral wall of the slow-flow plug (52) is fixedly connected to the peripheral wall of the tube body (512); and the fixing member (7) is connected between the tube body (512) and the vehicle frame (1).

5. The hydraulic support and leveling device for a motorhome according to claim 1, characterized in that: The fixing member (7) comprises a compression arc block (71), a stopper (72) and a fixing screw (73); the compression arc block (71) is abutted against the balancing tube (5); one end of the compression arc block (71) is hinged to the vehicle frame (1); the other end of the compression arc block (71) is abutted against the vehicle frame (1); the stopper (72) is fixedly connected to the compression arc block (71); the stopper (72) is abutted against the outer end wall of the balancing tube (5); a fixing hole (711) is provided on the compression arc block (71); a fixing screw hole (14) opposite to the fixing hole (711) is provided on the vehicle frame (1); the fixing screw (73) is inserted into the fixing hole (711) and the fixing screw hole (14); the fixing screw (73) is threadedly connected to the hole wall of the fixing screw hole (14).

6. The hydraulic support and leveling device for a recreational vehicle according to claim 1, characterized in that: A groove (8) is provided on the outer side wall of the carriage, and the hydraulic support leg (2) is arranged in the groove (8).

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