Length-adjustable anti-seismic chassis for motor home

Abstract

The invention relates to a length-adjustable anti-seismic chassis for a motor home, and relates to the related technical field of motor home chassis, and the length-adjustable anti-seismic chassis comprises a chassis, a connecting seat, a connector, a connecting shell, an adjusting module, a sliding shell, a connecting piece, a middle shaft piece, a balance detection assembly, wheels and a damping spring piece. An existing carriage is poor in anti-seismic effect, when the carriage passes through some bumpy road surfaces, high-frequency vibration causes vibration collision and damage to objects in the carriage, people feel uncomfortable, the vibration amplitude of the carriage is increased due to back-and-forth swing of the gravity center of the carriage with the too high gravity center, and the situation that the carriage turns over is possibly caused is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field related to a motorhome chassis, and in particular to a length-adjustable earthquake-resistant chassis for a motorhome. Background Art

[0002] RV, also known as motorhome, camper or mobile home, is a special vehicle that integrates accommodation, entertainment and living. It combines the mobility of a car with the comfort of a house, allowing people to enjoy a freer and more convenient living experience during travel. RVs are usually divided into two categories: self-propelled and trailer-type. For trailer-type RVs, the chassis is the supporting structure of the car body, which determines the RV's carrying capacity, stability and driving performance.

[0003] Existing RV chassis, such as the Chinese patent with publication number CN207173428U, discloses an all-aluminum RV chassis system, including an all-aluminum alloy chassis frame and a suspension device connected to both sides of the all-aluminum alloy chassis frame; the all-aluminum alloy chassis frame includes an A-frame and a chassis frame connected in sequence; a longitudinal beam extends from the top of the A-frame toward the chassis frame; the longitudinal beam extends to the rear of the chassis frame and is connected to the chassis frame; a tow hook is connected to the top of the A-frame; one of the side frames of the A-frame is fixedly connected to a rotatable support leg; a handle is installed on the upper part of the support leg. This all-aluminum RV chassis system has a simple structure and low manufacturing cost; compared with the existing steel structure RV chassis, it is lighter; all connecting parts are riveted to avoid deformation of the all-aluminum chassis frame that is easily caused by welding.

[0004] In the above-mentioned technology, the main consideration is the structural stability, and the shock absorption when encountering bumpy roads is not taken into consideration. The existing trailer chassis is often connected to simple wheels and has poor shock resistance. When passing through some bumpy roads, the high-frequency vibration causes the objects inside the car to vibrate and collide, causing damage, and the personnel will also feel uncomfortable. For a car with a high center of gravity, the vibration amplitude of the car will increase due to the back-and-forth swing of the center of gravity, which may cause a rollover.

[0005] Based on this, there is still room for improvement on existing technologies. Summary of the invention

[0006] The object of the present invention is to provide a length-adjustable earthquake-resistant chassis for a recreational vehicle to solve the deficiencies in the above-mentioned prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solutions: A length-adjustable earthquake-resistant chassis for a recreational vehicle comprises a chassis; a connecting seat, which is slidably arranged at the front end of the chassis, and a connector is installed at the front end of the connecting seat; a connecting shell, which is installed at the middle position of the side end of the chassis, and an adjustment module is arranged inside the connecting shell; a sliding shell, which is slidably arranged in the connecting shell up and down, and the height of the sliding shell is limited by the adjustment module; a connecting piece, which is installed at the lower end of the sliding shell, and the outer side of the connecting piece is rotatably connected to an intermediate shaft, and the angle between the connecting piece and the intermediate shaft is temporarily locked by a balance detection component; a wheel, which is rotatably installed on the intermediate shaft, and a shock-absorbing spring piece is connected between the intermediate shaft and the sliding shell.

[0008] As a preferred technical solution of the present invention, the connecting seat includes a connecting frame, whose rear end is horizontally slidably arranged in a sliding groove opened at the front end of the chassis, and the outer side of the connecting frame is evenly provided with snap-in grooves from front to back, and a connector is installed at the front end of the connecting frame; a snap-in piece, which passes through the through groove opened in the side wall of the chassis and is snapped into the snap-in groove.

[0009] As a preferred technical solution of the present invention, the adjustment module includes a sliding rod, which is slidably arranged inside the connecting shell up and down, the sliding rod and the connecting shell are elastically connected, and a top support head is installed at the upper end of the sliding rod; a limiting rod, whose upper end is connected to the lower end of the sliding rod, and a universal wheel is installed at the lower end of the limiting rod; a balancing piece, the middle part of which is connected to the inside of the connecting shell through a pin shaft, and the inner end of the balancing piece is used in conjunction with the top support head.

[0010] As a preferred technical solution of the present invention, the sliding shell includes a shell, on the inner side of which a sliding block is fixedly installed, the sliding block is slidably sleeved up and down on a sliding rod, the sliding rod is installed in a sliding groove opened on the side wall of the connecting shell, a compression spring is connected between the upper end of the sliding groove and the sliding block, the compression spring is located in a compression sleeve, and the compression sleeve is installed between the upper end of the sliding groove and the sliding block; a pressing head is installed on the inner side of the sliding block, and a pressing rod used in conjunction with the pressing head is slidably arranged in a limit sleeve up and down, the limit sleeve is fixedly installed in the sliding groove, and is used in conjunction with the outer end of the balancing member.

[0011] As a preferred technical solution of the present invention, the compression sleeve includes a buffer rod, the upper end of the buffer rod is installed at the upper end position of the slide groove, the lower end of the buffer rod is slidably arranged in an entry groove opened at the lower end of the slide groove, the entry groove and the lower end of the buffer rod are elastically connected, the buffer rod is arranged in a ring shape, and buffer washers that can slide up and down are arranged in sequence from top to bottom between the buffer rods.

[0012] As a preferred technical solution of the present invention, the connecting member includes a connecting block, which is installed at the lower end of the sliding shell, a connecting block is installed at the outer end of the connecting block, a rotating shaft is installed at the outer end of the connecting block, and a limiting block is installed at the outer end of the rotating shaft.

[0013] As a preferred technical solution of the present invention, the intermediate shaft member includes an intermediate shaft, a fixing member is installed at the inner end of the intermediate shaft, a shock-absorbing spring member is connected between the fixing member and the sliding shell, and the intermediate shaft and the wheel are rotationally connected; a connecting ring is installed on the inner side of the fixing member, the connecting ring and the rotating shaft are rotationally connected, an arc groove is opened on the side of the inner ring of the connecting ring away from the connecting block, and the limit block is slidably arranged in the arc groove.

[0014] As a preferred technical solution of the present invention, the balance detection component includes a balance cylinder, which is rotatably arranged in an inner cavity opened in a connecting block through a pin shaft; a gravity piece, which is installed at the lower end of the balance cylinder, and the outer half of the balance cylinder is symmetrically provided with inner grooves in the upper and lower parts; a movable rod, which is horizontally slidably arranged in the inner cavity, and the movable rod and the inner cavity are elastically connected, and a contact head is installed on the inner end surface of the movable rod, and the contact head is used in conjunction with the balance cylinder; a clamping joint, which is slidably arranged in the inner groove opened at the outer end of the movable rod, and the clamping joint and the inner groove are elastically connected.

[0015] As a preferred technical solution of the present invention, an embedded groove is provided at the inner side of the outer ring of the connecting ring, and the clamping joint at the initial position is embedded in the embedded groove.

[0016] In summary, this application includes the following beneficial technical effects: The present invention provides a length-adjustable earthquake-resistant chassis for a motor home. The length of the chassis can be adjusted to adapt to cars of different lengths, and various road conditions can be coped with through a dual earthquake-resistant structure (a matching structure among a connecting shell, an adjustment module, and a sliding shell, and a matching structure among a connecting piece, an intermediate shaft piece, and a balance detection component). When the vehicle is traveling, real-time detection is performed through a balance detection component. When encountering a bumpy road, the balance detection component unlocks the angle between the connecting piece and the intermediate shaft piece, and drives the unlocked wheels through a shock-absorbing spring piece to perform angle-type buffering and shock absorption. At the same time, the adjustment module appropriately unlocks the height of the sliding shell, and the balance performance of the chassis is improved by adaptively adjusting the positions of the sliding shell and the chassis to prevent rollover caused by one side of the chassis being too high and the other too low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is a top view of the present invention; Figure 3 The present invention Figure 2 AA section view; Figure 4 The present invention Figure 3 A partial schematic diagram of Figure 5 The present invention Figure 4 A local enlarged view of point X; Figure 6 The present invention Figure 4 A local enlarged view of the Y position; Figure 7 It is a structural schematic diagram of the connecting shell, the adjusting module, the sliding shell, the connecting member and the intermediate shaft member of the present invention.

[0018] Explanation of reference numerals: 1, chassis; 2, connecting seat; 3, connector; 4, connecting shell; 5, adjustment module; 6, sliding shell; 7, connecting piece; 8, intermediate shaft; 9, balance detection assembly; 10, wheel; 11, shock-absorbing spring member; 21, connecting frame; 22, snap-in groove; 23, snap-in member; 51, sliding rod; 52, top support head; 53, limit rod; 54, universal wheel; 55, balance member; 61, shell; 62, sliding block; 63, sliding Rod; 64, compression spring; 65, compression sleeve; 66, pressing head; 67, pressing rod; 68, limiting sleeve; 651, buffer rod; 652, buffer washer; 71, connecting block; 72, connecting block; 73, rotating shaft; 74, limiting block; 81, intermediate shaft; 82, fixing piece; 83, connecting ring; 84, embedded groove; 91, balancing cylinder; 92, gravity piece; 93, inner groove; 94, movable rod; 95, contact head; 96, card connector. DETAILED DESCRIPTION

[0019] The following is combined with Figures 1 to 7 This application is described in further detail.

[0020] An embodiment of the present application discloses a length-adjustable earthquake-resistant chassis for a motorhome. The length of the chassis can be adjusted to adapt to vehicles of different lengths, and a dual earthquake-resistant structure can be used to cope with various road conditions.

[0021] Reference Figures 1 to 4 As shown, the embodiment discloses a length-adjustable earthquake-resistant chassis for a motorhome, comprising a chassis 1, a connecting seat 2, a connector 3, a connecting shell 4, an adjustment module 5, a sliding shell 6, a connecting piece 7, an intermediate shaft 8, a balance detection assembly 9, a wheel 10, and a shock-absorbing spring member 11. The chassis 1 is a fixed foundation, the connecting seat 2 is slidably arranged at the front end of the chassis 1, the front end of the connecting seat 2 is installed with the connector 3, the connecting shell 4 is installed in the middle position of the side end of the chassis 1, the interior of the connecting shell 4 is provided with an adjustment module 5, the sliding shell 6 is slidably arranged in the connecting shell 4 up and down, the height of the sliding shell 6 is limited by the adjustment module 5, the connecting piece 7 is installed at the lower end of the sliding shell 6, the outer side of the connecting piece 7 and the intermediate shaft 8 are rotatably connected, and the angle between the connecting piece 7 and the intermediate shaft 8 is temporarily locked by the balance detection assembly 9, the wheel 10 is rotatably installed on the intermediate shaft 8, and a shock-absorbing spring member 11 is connected between the intermediate shaft 8 and the sliding shell 6.

[0022] In actual use, the length between the chassis 1 and the connecting seat 2 is adjusted to make its length consistent with the length of the subsequent car body to be assembled. After the adjustment is completed, the car body is assembled with the adjusted chassis 1 and the connecting seat 2, and connected to the tractor through the connector 3. The tractor drives the present application and the car body to be towed and moved. During road driving, if the road surface is flat, daily buffering and shock absorption are performed by the tires and tire pressure of the wheels 10. When the road surface is bumpy, the balance detection component 9 unlocks the angle between the connecting member 7 and the intermediate shaft member 8, and drives the wheels 10 to perform angle buffering and shock absorption through the shock-absorbing spring member 11. At the same time, the adjustment module 5 appropriately unlocks the height of the sliding shell 6, and improves the balance performance of the chassis 1 by adjusting the height between the sliding shell 6 and the chassis 1 to prevent rollover caused by excessive height difference between the two sides of the chassis 1.

[0023] Reference Figure 1 As shown, the connecting seat 2 includes a connecting frame 21, a snap-in groove 22, and a snap-in piece 23. The rear end of the connecting frame 21 is horizontally slidably set in the sliding groove opened at the front end of the chassis 1. The outer side of the connecting frame 21 is evenly provided with snap-in grooves 22 from front to back. The front end of the connecting frame 21 is installed with a connector 3. The snap-in piece 23 passes through the through groove opened on the side wall of the chassis 1 and is snapped into the snap-in groove 22.

[0024] During the actual length adjustment process, the clamping member 23 is pulled outward to adjust the relative positions between the connecting frame 21 and the chassis 1 to adjust the total length. After the adjustment is completed, the clamping member 23 is pushed to the initial position so that it is inserted into the corresponding clamping slot 22 to form a position lock.

[0025] Reference Figure 4 , Figure 5 , Figure 7 As shown, when the road surface is too bumpy, the balance detection component 9 unlocks the angle between the connecting member 7 and the intermediate shaft member 8, and the adjustment module 5 unlocks the height of the sliding shell 6. The height between the sliding shell 6 and the chassis 1 is adjusted to improve the balance performance of the chassis 1. The specific structure is as follows: the adjustment module 5 includes a sliding rod 51, a top support head 52, a limit rod 53, a universal wheel 54, and a balance member 55. The sliding rod 51 is arranged inside the connecting shell 4 for sliding up and down movement. The sliding rod 51 and the connecting shell 4 are elastically connected. The upper end of the sliding rod 51 is provided with a top support head 52. The upper end of the limiting rod 53 is connected to the lower end of the sliding rod 51, and a universal wheel 54 is installed at the lower end of the limiting rod 53. The middle part of the balancing member 55 is connected to the inside of the connecting shell 4 through a pin shaft. The inner end of the balancing member 55 is used in conjunction with the top support head 52. When driving on a flat road, the universal wheel 54 is in normal contact with the ground, the sliding amplitude of the sliding rod 51 and the limiting rod 53 is small, and the top support head 52 has a more obvious degree of limiting on the inner end of the balancing member 55, so that the balancing member 55 is in a relatively balanced state (a small angle change may occur when encountering a slightly bumpy road surface).

[0026] Reference Figure 5 As shown, the sliding shell 6 includes a shell 61, a sliding block 62, a sliding rod 63, a compression spring 64, a compression sleeve 65, a pressing head 66, a pressing rod 67, and a limiting sleeve 68. The sliding block 62 is fixedly installed on the inner side of the shell 61. The sliding block 62 is slidably sleeved up and down on the sliding rod 63. The sliding rod 63 is installed in a slide groove opened on the side wall of the connecting shell 4. A compression spring 64 is connected between the upper end of the slide groove and the sliding block 62. The compression spring 64 is located in the compression sleeve 65. The compression sleeve 65 is installed between the upper end of the slide groove and the sliding block 62. The pressing head 66 is installed on the inner side of the sliding block 62. The pressing rod 67 used in conjunction with the pressing head 66 is slidably set up and down in the limiting sleeve 68. The limiting sleeve 68 is fixedly installed in the slide groove, and the pressing head 66 is used in conjunction with the outer end of the balancing member 55.

[0027] In the actual adjustment process, when the road surface is bumpy (there are many stones on the road surface and the road surface is uneven), the left and right ends of the chassis 1 appear one high and one low, and when there is a height difference, the chassis 1 is on the higher side, and its universal wheel 54 is separated from the ground, but due to the elastic effect, the sliding rod 51 drives the limiting rod 53 to extend downward until the universal wheel 54 re-contacts the ground, but at this time the top support head 52 drops, causing the balance of the balance member 55 to be destroyed. At this time, the upper end of the pressing rod 67 loses the limit, and the position of the pressing head 66 is unlocked synchronously. The sliding block 62 can drive the shell 61 to float up and down elastically, but the floating area is limited to the active height of the pressing rod 67. When the height difference of the chassis 1 is large, the sliding rod 51 on the higher side slides down a longer distance. At this time, the greater the rotatable angle of the balance member 55, the greater the rising height of the pressing rod 67, and the larger the lifting area of ​​the shell 61. Conversely, the smaller the lifting area, the purpose of balancing the chassis 1 is achieved by controlling the relative positions between the sliding shell 6 and the chassis 1 to avoid rollover.

[0028] Reference Figure 5 As shown, the compression sleeve 65 includes a buffer rod 651, the upper end of the buffer rod 651 is installed at the upper end position of the slide slot, the lower end of the buffer rod 651 is slidably set in an entry slot opened at the lower end of the slide slot, the entry slot and the lower end of the buffer rod 651 are elastically connected, the buffer rod 651 is arranged in a ring, and buffer washers 652 that can slide up and down are arranged in sequence from top to bottom between the buffer rods 651.

[0029] In the actual shock absorption process, the shock absorption effect is improved through the elastic sliding of the buffer rod 651 and the collision between the buffer washers 652.

[0030] Reference Figure 6 , Figure 7As shown, when the road surface is bumpy, the balance detection component 9 unlocks the angle between the connecting member 7 and the intermediate shaft member 8, and drives the wheel 10 to perform angle buffering and shock absorption through the shock-absorbing spring member 11. The specific structure is as follows: the connecting member 7 includes a connecting block 71, which is installed at the lower end of the sliding shell 6, and a connecting block 72 is installed at the outer end of the connecting block 71, and a rotating shaft 73 is installed at the outer end of the connecting block 72, and a limiting block 74 is installed at the outer end of the rotating shaft 73.

[0031] Reference Figure 4 , Figure 6 , Figure 7 As shown, the intermediate shaft member 8 includes an intermediate shaft 81, a fixing member 82, and a connecting ring 83. The fixing member 82 is installed at the inner end of the intermediate shaft 81. A shock-absorbing spring member 11 is connected between the fixing member 82 and the sliding shell 6. The intermediate shaft 81 and the wheel 10 are rotationally connected. The connecting ring 83 is installed on the inner side of the fixing member 82. The connecting ring 83 and the rotating shaft 73 are rotationally connected. An arc groove is provided on the side of the inner ring of the connecting ring 83 away from the connecting block 71. The limit block 74 is slidably set in the arc groove to limit the range of motion and give it a certain angle of motion.

[0032] Reference Figure 6 As shown, the balance detection assembly 9 includes a balance cylinder 91, a weight member 92, an inner groove 93, a movable rod 94, a contact head 95, and a clamping joint 96. The balance cylinder 91 is rotatably arranged in the inner cavity opened by the connecting block 71 through a pin shaft, the weight member 92 is installed at the lower end of the balance cylinder 91, and the outer half of the balance cylinder 91 is symmetrically provided with an inner groove 93, the movable rod 94 is horizontally slidably arranged in the inner cavity, the movable rod 94 is elastically connected to the inner cavity, the inner end surface of the movable rod 94 is installed with a contact head 95, and the contact head 96 is installed on the inner end surface of the movable rod 94. The head is used in conjunction with the balancing cylinder 91, and the clamping joint 96 is slidably set in the inner groove opened at the outer end of the movable rod 94. The clamping joint 96 and the inner groove are elastically connected. The clamping joint 96 is elastically connected, which reduces the difficulty of re-inserting it after it is detached from the embedded groove 84, and ensures the smoothness of the unlocking and locking switching of the position of the connecting ring 83 and the connecting block 72; the inner side of the outer ring of the connecting ring 83 is provided with an embedded groove 84, and the clamping joint 96 in the initial position is embedded in the embedded groove 84, and is in a clamped and locked state at this time.

[0033] In actual operation, during driving, when the road surface is relatively flat, the chassis 1 is in a relatively balanced state. At this time, under the gravity of the gravity member 92, the balancing cylinder 91 is in a slightly rotated state relative to the connecting block 71 (but the contact head 95 will not enter the inner groove 93). At this time, the clamping joint 96 clamps the embedded groove 84 so that the position of the connecting ring 83 and the connecting block 72 is relatively locked (the position between the wheel 10 and the sliding shell 6 is relatively fixed). The wheel 10 uses its own characteristics to absorb shock to offset the vibration. When the height difference between the two sides is large, the balance of the chassis 1 is broken, and the height difference between the two sides is large. However, the gravity of the gravity member 92 causes an angle difference to be formed between the balance cylinder 91 and the connecting block 71. At this time, the contact head 95 corresponds to the position of the inner groove 93 (there is a height difference between the left and right sides of the chassis 1, and there may be a possibility of rollover). Under the action of elasticity, the contact head 95 enters the inner groove 93, and the clamping joint 96 is disengaged from the embedded groove 84. The position of the connecting ring 83 and the connecting block 72 is unlocked, and the wheel 10 performs angle buffering and shock absorption under the action of the shock-absorbing spring member 11.

[0034] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A length-adjustable earthquake-resistant chassis for a motorhome, characterized in that: include: Chassis (1); A connecting seat (2) is slidably arranged at the front end of the chassis (1), and a connector (3) is installed at the front end of the connecting seat (2); A connecting shell (4) is installed at the middle of the side end of the chassis (1), and an adjusting module (5) is arranged inside the connecting shell (4); A sliding shell (6) is slidably disposed up and down in the connecting shell (4), and the height of the sliding shell (6) is limited by an adjusting module (5); A connecting member (7) is mounted on the lower end of the sliding shell (6), the outer side of the connecting member (7) is rotatably connected to the intermediate shaft member (8), and the angle between the connecting member (7) and the intermediate shaft member (8) is temporarily locked by a balance detection component (9); The wheel (10) is rotatably mounted on an intermediate shaft (8), and a shock-absorbing spring component (11) is connected between the intermediate shaft (8) and the sliding shell (6).

2. The length-adjustable earthquake-resistant chassis for a motorhome according to claim 1, characterized in that: The connecting seat (2) comprises: A connecting frame (21) whose rear end is horizontally slidably arranged in a sliding groove provided at the front end of the chassis (1); the outer side of the connecting frame (21) is evenly provided with snap-fitting grooves (22) from front to back; and a connector (3) is installed at the front end of the connecting frame (21); The clamping piece (23) passes through a through slot provided on the side wall of the chassis (1) and is clamped into the clamping slot (22).

3. The length-adjustable earthquake-resistant chassis for a motorhome according to claim 1, characterized in that: The adjustment module (5) comprises: A sliding rod (51) is slidably arranged inside the connecting shell (4) up and down, the sliding rod (51) and the connecting shell (4) are elastically connected, and a top support head (52) is installed at the upper end of the sliding rod (51); A limiting rod (53), the upper end of which is connected to the lower end of the sliding rod (51), and a universal wheel (54) is installed at the lower end of the limiting rod (53); The balance member (55) has its center connected to the interior of the connection shell (4) through a pin shaft, and the inner end of the balance member (55) cooperates with the top support head (52) for use.

4. The length-adjustable earthquake-resistant chassis for a motorhome according to claim 3, characterized in that: The sliding housing (6) comprises: The housing (61) has a sliding block (62) fixedly mounted on its inner side. The sliding block (62) is slidably sleeved on a sliding rod (63) up and down. The sliding rod (63) is mounted in a sliding groove provided on the side wall of the connecting housing (4). A compression spring (64) is connected between the upper end of the sliding groove and the sliding block (62). The compression spring (64) is located in a compression sleeve (65). The compression sleeve (65) is mounted between the upper end of the sliding groove and the sliding block (62). A pressing head (66) is mounted on the inner side of the sliding block (62). A pressing rod (67) used in conjunction with the pressing head (66) is slidably arranged in a limiting sleeve (68) up and down. The limiting sleeve (68) is fixedly mounted in the sliding groove. The pressing head (66) is used in conjunction with the outer end of the balancing member (55).

5. The length-adjustable earthquake-resistant chassis for a motorhome according to claim 4, characterized in that: The compression sleeve (65) includes a buffer rod (651), the upper end of the buffer rod (651) is installed at the upper end position of the slide groove, the lower end of the buffer rod (651) is slidably arranged in an entry groove opened at the lower end of the slide groove, the entry groove and the lower end of the buffer rod (651) are elastically connected, the buffer rod (651) is arranged in a ring shape, and buffer washers (652) that can slide up and down are arranged in sequence from top to bottom between the buffer rods (651).

6. The length-adjustable earthquake-resistant chassis for a motorhome according to claim 1, characterized in that: The connecting member (7) comprises a connecting block (71), the connecting block (71) is mounted on the lower end of the sliding shell (6), a connecting block (72) is mounted on the outer end of the connecting block (71), a rotating shaft (73) is mounted on the outer end of the rotating shaft (73), and a limiting block (74) is mounted on the outer end of the rotating shaft (73).

7. The length-adjustable earthquake-resistant chassis for a motorhome according to claim 6, characterized in that: The intermediate shaft (8) comprises: The intermediate shaft (81) has a fixing member (82) installed at its inner end, a shock absorbing spring member (11) is connected between the fixing member (82) and the sliding shell (6), and the intermediate shaft (81) and the wheel (10) are connected in a rotationally matched manner; The connecting ring (83) is mounted on the inner side of the fixing member (82). The connecting ring (83) is rotatably connected to the rotating shaft (73). An arc groove is formed on the inner ring of the connecting ring (83) away from the connecting block (71). The limiting block (74) is slidably arranged in the arc groove.

8. The length-adjustable earthquake-resistant chassis for a motorhome according to claim 7, characterized in that: The balance detection component (9) comprises: A balancing cylinder (91) is rotatably arranged in an inner cavity formed in the connecting block (71) via a pin; A gravity member (92) is mounted on the lower end of the balancing cylinder (91), and an inner groove (93) is symmetrically formed in the outer half of the balancing cylinder (91); A movable rod (94) is horizontally slidably arranged in the inner cavity, the movable rod (94) and the inner cavity are elastically connected, a contact head (95) is installed on the inner end surface of the movable rod (94), and the contact head is used in conjunction with the balancing cylinder (91); The clamping joint (96) is slidably arranged in an inner groove formed at the outer end of the movable rod (94), and the clamping joint (96) and the inner groove are elastically connected.

9. The length-adjustable earthquake-resistant chassis for a motorhome according to claim 8, characterized in that: An embedded groove (84) is provided at the inner side of the outer ring of the connecting ring (83), and the clamping joint (96) at the initial position is embedded in the embedded groove (84).

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