Adjustable auxiliary frame of motor caravan

Abstract

The adjustable auxiliary frame of the motor caravan comprises upper longitudinal beams, upper cross beams and edge beams, the two upper longitudinal beams are oppositely arranged in parallel, the upper cross beams are oppositely arranged at the two ends of the upper longitudinal beams, a plurality of upper reinforcing rods are arranged between the two upper longitudinal beams at intervals, and a frame is arranged below the upper longitudinal beams in parallel. The two ends of the frame are rotationally connected with the longitudinal beams through hinge mechanisms respectively, the side face of the upper longitudinal beam and the side face of the frame are elastically connected through adjusting mechanisms, the adjusting mechanisms are oppositely arranged on the outer side face of the upper longitudinal beam and the outer side face of the frame at intervals, and each adjusting mechanism comprises an L-shaped support, a sliding rod, a lower spring seat, an upper spring seat, a spiral spring and an adjusting nut. The upper longitudinal beam is rotationally connected with the lower frame through the hinge mechanism, the side faces of the longitudinal beam and the side faces of the frame are elastically connected through the adjusting mechanism, the spiral spring can be adjusted and replaced according to the weight of a carriage of the motor caravan, the adjusting nut can adjust the pre-tightening force of the spiral spring, shaking of the carriage is buffered, and the service life of the carriage is prolonged. And the comfort of the motor caravan is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile chassis, in particular to an adjustable subframe for a motorhome. Background Art

[0002] As living standards improve, more and more people are choosing to travel, and travel options are diversifying. Recreational vehicles (RVs), as a specialized vehicle that combines both residential and travel functions, are gaining popularity. RVs, also known as motorhomes, not only offer the transportation functions of traditional buses but also incorporate essential home amenities such as televisions, refrigerators, air conditioners, toilets, and beds, offering travelers immense convenience and comfort.

[0003] The subframe is a crucial component of the RV structure. It serves as the framework connecting the axle and the car body. It not only enhances the vehicle's structural strength but also acts as a vibration and noise barrier, effectively improving the comfort within the RV. While the subframe plays a significant role in improving vehicle performance, its inherent non-adjustability has also become increasingly apparent. In existing technologies, the subframe and axle of an RV are connected using an elastic connection. The spring stiffness applied to the subframe remains constant, making it impossible to flexibly adjust or change the spring stiffness based on road conditions, car body weight, or driving habits. This type of connection with a fixed spring stiffness is inadequate in complex and changing driving environments, resulting in excessive vibration in the car body under challenging road conditions, impacting ride comfort. Utility Model Content

[0004] In view of this, the present invention proposes an adjustable subframe for a motorhome to solve the above-mentioned problems.

[0005] The technical solution of the present utility model is achieved as follows:

[0006] A caravan adjustable subframe comprises an upper longitudinal beam, an upper cross beam and a side beam, wherein the two upper longitudinal beams are arranged parallel to each other, the upper cross beams are arranged at the two ends of the upper longitudinal beams, the top surface of the upper cross beam and the top surface of the upper longitudinal beam are flush with each other, a plurality of upper reinforcing rods are arranged between the two upper longitudinal beams, the two ends of the upper reinforcing rods are respectively fixed to the inner side surface of the upper longitudinal beam, a frame is arranged parallel to the lower part of the upper longitudinal beam, the two ends of the frame are respectively connected to the upper longitudinal beam by a hinge mechanism, the side surface of the upper longitudinal beam and the side surface of the frame are elastically connected by an adjustment mechanism, and the adjustment mechanism is arranged at relative intervals on the upper longitudinal beam The outer side surface and the outer side surface of the frame, the adjusting mechanism includes an L-shaped bracket, a sliding rod, a lower spring seat, an upper spring seat, a coil spring and an adjusting nut. The upper longitudinal beam side surface and the frame side surface are correspondingly provided with L-shaped brackets above and below. The L-shaped bracket is provided with a through hole, and a sliding rod is slidingly provided in the through hole. The bottom of the sliding rod is connected to the lower spring seat, and a coil spring is sleeved on the sliding rod. The coil spring is respectively located in the middle of the lower spring seat and the upper spring seat. The upper spring seat and the sliding rod are slidably connected, and an adjusting nut is provided on the top of the sliding rod, and the bottom surface of the adjusting nut and the top surface of the upper spring seat abut against each other.

[0007] Preferably, the upper longitudinal beam and the lower longitudinal beam are made of hollow rectangular steel tubes.

[0008] Preferably, the hinge mechanism includes an upper hinge plate, a lower hinge plate and a hinge shaft, the upper hinge plate is located on one side of the cross beam and the two ends are respectively arranged on the side of the longitudinal beam, the bottoms of the two lower hinge plates are arranged on the top surface of the frame, the upper hinge plate is located between the two lower hinge plates, the upper hinge plate and the lower hinge plate are rotatably connected through the hinge shaft, and the hinge shaft is parallel to the longitudinal beam.

[0009] Preferably, the frame includes a lower longitudinal beam, a lower cross beam and a lower reinforcing rod, the two lower longitudinal beams are arranged parallel to each other, the lower cross beams are arranged at the two ends of the lower longitudinal beam, the top surface of the lower cross beam and the top surface of the lower longitudinal beam are flush with each other, and a plurality of lower reinforcing rods are arranged between the two lower longitudinal beams, the lower reinforcing rods are arranged crosswise with each other and the two ends are respectively fixed to the inner side surface of the lower longitudinal beam.

[0010] Preferably, the upper spring seat includes an upper support seat and an elastic gasket, the upper support seat is slidably arranged on the upper part of the slide rod, the elastic gasket is arranged on the bottom surface of the upper support seat and the top surface of the upper L-shaped bracket, and the lower spring seat includes a lower support seat and an elastic gasket, the lower support seat is fixedly arranged on the bottom of the slide rod, and the elastic gasket is arranged on the top surface of the lower support seat and the bottom surface of the lower L-shaped bracket.

[0011] Preferably, a spiral groove is provided on the top of the elastic gasket, and both ends of the spiral spring are respectively arranged in the spiral groove.

[0012] Preferably, it further comprises positioning pins, which are respectively arranged at two ends of the beam.

[0013] Preferably, it further comprises a sleeve and a buffer block, wherein a plurality of the sleeves are arranged at intervals on the top surface of the lower longitudinal beam, a buffer block is arranged in the sleeve, and the top of the buffer block is located below the bottom surface of the upper longitudinal beam.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The upper longitudinal beam is rotatably connected to the frame below through a hinge mechanism, and the side surfaces of the longitudinal beam and the frame are elastically connected through an adjustment mechanism. Coil springs of appropriate stiffness are selected according to the weight of the caravan compartment, and the adjustment mechanisms are assembled. Multiple adjustment mechanisms are installed on the side surfaces of the upper longitudinal beam and the frame. The caravan compartment is then hoisted and installed on the top surfaces of the upper longitudinal beam, upper cross beam, and side beams. The adjustment nuts are adjusted so that the preload of the coil springs meets the preset range and the caravan compartment is in a level state. The adjustment mechanism allows for flexible adjustment and replacement of coil springs to improve the comfort of the caravan. When the compartment load changes and causes the compartment to deflect, the adjustment mechanism can be used to straighten the compartment to avoid damage to the body due to long-term driving in an unbalanced state.

[0016] 2. A buffer block is set between the upper longitudinal beam and the lower frame to limit the swing stroke of the upper longitudinal beam, improve the adaptability of the caravan to different road conditions, avoid collision between the upper longitudinal beam and the frame, and damage to the subframe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of an adjustable subframe for a motorhome according to the present invention;

[0019] Figure 2 This is a schematic cross-sectional view of an adjustable subframe for a motorhome according to the present invention;

[0020] Figure 3 This is a schematic diagram of the elastic gasket structure of the utility model;

[0021] Figure markings: 1. upper cross beam; 2. upper longitudinal beam; 3. upper reinforcing rod; 4. upper hinge plate; 5. lower hinge plate; 6. hinge shaft; 7. side beam; 8. groove; 9. L-shaped bracket; 10. slide rod; 11. coil spring; 12. upper support seat; 13. lower support seat; 14. adjusting nut; 15. sleeve; 16. buffer block; 17. positioning pin; 18. through hole; 19. elastic gasket; 20. lower cross beam; 21. lower longitudinal beam; 22. lower reinforcing rod. DETAILED DESCRIPTION

[0022] In order to better understand the technical content of the present invention, a specific embodiment is provided below, and the present invention is further described in conjunction with the accompanying drawings.

[0023] See also Figures 1 to 3 The utility model provides an adjustable subframe for a caravan, comprising an upper longitudinal beam 2, an upper cross beam 1 and a side beam 7. The two upper longitudinal beams 2 are arranged parallel to each other, and the upper cross beam 1 is relatively arranged at the two ends of the upper longitudinal beam 2. The top surface of the upper cross beam 1 and the top surface of the upper longitudinal beam 2 are flush with each other. A plurality of upper reinforcing rods 3 are arranged between the two upper longitudinal beams 2. The two ends of the upper reinforcing rod 3 are respectively fixed to the inner side surface of the upper longitudinal beam 2. A frame is arranged parallel to the lower part of the upper longitudinal beam 2. The two ends of the frame are respectively rotatably connected to the upper longitudinal beam 2 by a hinge mechanism. The side surface of the upper longitudinal beam 2 and the side surface of the frame are elastically connected by an adjusting mechanism. The adjusting mechanism is relatively spaced and arranged on the outer side surface of the upper longitudinal beam 2 and the outer side surface of the frame. The structure includes an L-shaped bracket 9, a sliding rod 10, a lower spring seat, an upper spring seat, a coil spring 11 and an adjusting nut 14. The upper longitudinal beam 2 and the frame side are correspondingly provided with L-shaped brackets 9. The L-shaped bracket 9 is provided with a through hole 18, which is an oblong hole. A sliding rod 10 is slidably provided in the through hole 18. The bottom of the sliding rod 10 is connected to the lower spring seat. The sliding rod 10 is sleeved with a coil spring 11, and the coil spring 11 is respectively located in the middle of the lower spring seat and the upper spring seat. The upper spring seat and the sliding rod 10 are slidably connected. An adjusting nut 14 is provided on the top of the sliding rod 10. The adjusting nut 14 is threadedly connected to the sliding rod 10, and the bottom surface of the adjusting nut 14 and the top surface of the upper spring seat abut against each other.

[0024] The bottom of the frame is mounted on the top surface of the RV suspension to secure and support the upper longitudinal beam 2. When installing the frame, the frame is first mounted on the top surface of the RV suspension, and then the hinge mechanism is respectively mounted on the frame and the upper longitudinal beam 2. A coil spring 11 of appropriate stiffness is selected based on the weight of the RV compartment. The adjustment mechanism is then assembled, with multiple adjustment mechanisms mounted on the sides of the upper longitudinal beam 2 and the frame. The RV compartment is then hoisted and mounted on the top surfaces of the upper longitudinal beam 2, upper crossbeam 1, and side beams 7. Finally, the adjustment nut 14 is adjusted so that the preload force of the coil spring 11 is within a preset range, and the RV compartment is leveled, completing the installation of the RV compartment. While the RV is in motion, the adjustment mechanism allows for flexible adjustment and replacement of the coil spring 11, cushioning the swaying of the compartment and improving the comfort of the RV.

[0025] Preferably, the upper longitudinal beam 2 and the lower longitudinal beam 21 are made of hollow rectangular steel tubes.

[0026] The use of hollow rectangular steel tubes for the upper longitudinal beam 2 and the lower longitudinal beam 21 is beneficial to reducing the weight of the entire RV, making the subframe more flexible, and avoiding excessive weight of the subframe, which leads to increased fuel consumption of the RV.

[0027] Preferably, the hinge mechanism includes an upper hinge plate 4, a lower hinge plate 5 and a hinge shaft 6, the upper hinge plate 4 is located on one side of the cross beam and the two ends are respectively arranged on the side of the longitudinal beam, the bottoms of the two lower hinge plates 5 are arranged on the top surface of the frame, the upper hinge plate 4 is located between the two lower hinge plates 5, the upper hinge plate 4 and the lower hinge plate 5 are rotatably connected through the hinge shaft 6, and the hinge shaft 6 is parallel to the longitudinal beam.

[0028] When the RV travels over bumpy roads, the RV suspension experiences some torsion. The frame, mounted on the suspension, also generates some torque. The hinged mechanism connects the upper longitudinal beam 2 and the frame to mitigate the effects of frame torque. The hinge axis 6 is parallel to the longitudinal beam, causing the vehicle body to sway. The vehicle body then drives the upper longitudinal beam 2 to rotate around the hinge axis 6, reducing the impact of road vibration on the vehicle.

[0029] Preferably, the frame includes a lower longitudinal beam 21, a lower cross beam 20 and a lower reinforcing rod 22. The two lower longitudinal beams 21 are arranged in parallel and opposite to each other. The lower cross beams 20 are arranged at the two ends of the lower longitudinal beam 21 respectively. The top surface of the lower cross beam 20 and the top surface of the lower longitudinal beam 21 are flush with each other. A plurality of lower reinforcing rods 22 are arranged between the two lower longitudinal beams 21. The lower reinforcing rods 22 are arranged crosswise with each other and the two ends are respectively fixed to the inner side surface of the lower longitudinal beam 21.

[0030] The frame is fixed to the top surface of the caravan suspension, and plays the role of supporting and connecting the upper longitudinal beam 2. The lower reinforcing rods 22 are arranged crosswise to increase the overall rigidity of the frame.

[0031] Preferably, the upper spring seat includes an upper support seat 12 and an elastic gasket 19, the upper support seat 12 is slidably arranged on the upper part of the slide rod 10, and the elastic gasket 19 is arranged on the bottom surface of the upper support seat 12 and the top surface of the upper L-shaped bracket 9, and the lower spring seat includes a lower support seat 13 and an elastic gasket 19, the lower support seat 13 is fixedly arranged on the bottom of the slide rod 10, and the elastic gasket 19 is arranged on the top surface of the lower support seat 13 and the bottom surface of the lower L-shaped bracket 9.

[0032] After the caravan compartment is hoisted and installed on the top surface of the upper longitudinal beam 2, the upper cross beam 1, and the side beam 7, an elastic washer 19, a coil spring 11, and an elastic washer 19 are sequentially inserted into the slide bar 10, and then the slide bar 10 is passed from bottom to top through the through holes 18 on the two L-shaped brackets 9. Then, an elastic washer 19, a coil spring 11, an elastic washer 19, and an upper support seat 12 are sequentially inserted into the slide bar 10, and finally, the adjustment nut 14 is screwed into the upper part of the slide bar 10, thus completing the assembly operation of the adjustment mechanism. The adjustment nut 14 is tightened or loosened a certain number of times so that the preload force of the coil spring 11 meets the preset range and the caravan compartment is in a horizontal state. The adjustment mechanism can flexibly adjust and replace the coil spring 11, thereby improving the comfort of the caravan.

[0033] Preferably, a spiral groove 8 is provided on the top of the elastic gasket 19 , and both ends of the coil spring 11 are respectively arranged in the spiral groove 8 .

[0034] After the adjustable subframe of the motorhome is installed, the coil spring 11 is in a compressed state. When the motorhome is traveling, it is impacted by the ground, and the coil spring 11 is continuously compressed and extended. The rubber pad can prevent the coil spring 11 from directly colliding with the upper support seat 12 and the lower support seat 13, which is beneficial to reducing noise.

[0035] Preferably, it further comprises positioning pins 17, which are respectively arranged at two ends of the beam.

[0036] After the adjustable sub-frame of the caravan is installed, the caravan compartment will be installed on the top of the sub-frame. Corresponding positioning holes are correspondingly provided at the bottom of the caravan compartment. When installing the compartment, the positioning holes can be sleeved on the positioning pins 17 using the positioning pins 17, which is conducive to improving the installation speed of the compartment.

[0037] Preferably, it further includes a sleeve 15 and a buffer block 16 , wherein a plurality of the sleeves 15 are spaced apart on the top surface of the lower longitudinal beam 21 , and a buffer block 16 is provided in the sleeve 15 , and the top of the buffer block 16 is located below the bottom surface of the upper longitudinal beam 2 .

[0038] When the caravan is traveling on a bumpy road, the car body will shake and the upper longitudinal beam 2 will rotate around the hinge shaft 6. The buffer block 16 is used to limit the swing of the upper longitudinal beam 2 to prevent the upper longitudinal beam 2 from shaking too much and affecting the comfort of the caravan.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An adjustable subframe for a motorhome, characterized in that: The frame is provided with a plurality of upper reinforcing rods at intervals between the two upper longitudinal beams, and the two ends of the upper reinforcing rods are respectively fixed to the inner side surfaces of the upper longitudinal beams. A frame is provided in parallel below the upper longitudinal beams, and the two ends of the frame are respectively rotatably connected to the upper longitudinal beams through a hinge mechanism. The side surfaces of the upper longitudinal beams and the side surfaces of the frame are elastically connected through an adjustment mechanism. The adjustment mechanisms are relatively spaced and arranged on the outer side surfaces of the upper longitudinal beams and the frame. The outer side of the frame, the adjusting mechanism includes an L-shaped bracket, a sliding rod, a lower spring seat, an upper spring seat, a coil spring and an adjusting nut. The upper longitudinal beam side and the frame side are correspondingly provided with L-shaped brackets above and below. The L-shaped bracket is provided with a through hole, and a sliding rod is slidingly provided in the through hole. The bottom of the sliding rod is connected to the lower spring seat, and a coil spring is sleeved on the sliding rod. The coil spring is respectively located in the middle of the lower spring seat and the upper spring seat. The upper spring seat and the sliding rod are slidably connected, and an adjusting nut is provided on the top of the sliding rod, and the bottom surface of the adjusting nut and the top surface of the upper spring seat abut against each other.

2. The adjustable subframe of a motorhome according to claim 1, characterized in that: The upper longitudinal beam and the lower longitudinal beam are made of hollow rectangular steel pipes.

3. The adjustable sub-frame of a motorhome according to claim 1, characterized in that: The hinge mechanism includes an upper hinge plate, a lower hinge plate and a hinge shaft. The upper hinge plate is located on one side of the crossbeam and its two ends are respectively arranged on the side surfaces of the longitudinal beam. The bottoms of the two lower hinge plates are arranged on the top surface of the frame. The upper hinge plate is located between the two lower hinge plates. The upper hinge plate and the lower hinge plate are rotatably connected through the hinge shaft, and the hinge shaft is parallel to the longitudinal beam.

4. The adjustable sub-frame of a motorhome according to claim 1, characterized in that: The frame includes a lower longitudinal beam, a lower cross beam and a lower reinforcing rod. The two lower longitudinal beams are arranged in parallel and opposite to each other. The lower cross beams are arranged at both ends of the lower longitudinal beams. The top surface of the lower cross beam and the top surface of the lower longitudinal beam are flush with each other. A plurality of lower reinforcing rods are arranged between the two lower longitudinal beams. The lower reinforcing rods are arranged crosswise with each other and the two ends are respectively fixed to the inner side surface of the lower longitudinal beam.

5. The adjustable sub-frame of a motorhome according to claim 1, characterized in that: The upper spring seat includes an upper support seat and an elastic gasket, the upper support seat is slidably arranged on the upper part of the slide rod, the elastic gasket is arranged on the bottom surface of the upper support seat and the top surface of the upper L-shaped bracket, the lower spring seat includes a lower support seat and an elastic gasket, the lower support seat is fixedly arranged on the bottom of the slide rod, and the elastic gasket is arranged on the top surface of the lower support seat and the bottom surface of the lower L-shaped bracket.

6. The adjustable sub-frame of a motorhome according to claim 5, characterized in that: A spiral groove is provided on the top of the elastic gasket, and both ends of the spiral spring are respectively arranged in the spiral groove.

7. The adjustable sub-frame of a motorhome according to claim 1, characterized in that: It also includes positioning pins, which are respectively arranged at two ends of the beam.

8. The adjustable sub-frame of a motorhome according to claim 1, characterized in that: It also includes a sleeve and a buffer block. A plurality of the sleeves are arranged at intervals on the top surface of the lower longitudinal beam. The buffer block is arranged in the sleeve, and the top of the buffer block is located below the bottom surface of the upper longitudinal beam.

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