Frame structure and vehicle

Abstract

The utility model discloses a kind of frame structure and vehicle, it is related to vehicle technical field, wherein, frame structure includes frame and connecting device, frame includes chassis and auxiliary frame, the chassis is used to install power drive system, the carriage of motor home is used to install the auxiliary frame;The chassis has main longitudinal beam, the auxiliary frame has auxiliary longitudinal beam, the auxiliary longitudinal beam is located in the upside of the main longitudinal beam, connecting device includes two mounting brackets separately arranged in the main longitudinal beam and the auxiliary longitudinal beam, the part of two the mounting bracket exposed in the outside of the main longitudinal beam is connected.The technical scheme provided by the utility model can improve the problem that motor home is difficult to install auxiliary frame to chassis when loading.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a vehicle frame structure and a vehicle. Background Technology

[0002] Currently, motorhomes, as a type of modified vehicle, are gradually becoming an essential mode of transportation for travelers. Structurally, motorhomes require a subframe. The longitudinal beams of the subframe are connected to the longitudinal beams of the chassis via bolts, welding, or other methods to create a higher and larger working surface on the chassis longitudinal beams, which is then used to install the motorhome's cabin.

[0003] Therefore, the subframe typically houses modular assemblies and components for the cabin, such as water tanks, air conditioners, and electric step stairs. Furthermore, because the bolts used to mount the subframe to the chassis longitudinal beams are usually installed directly from top to bottom through the subframe and chassis, conversion shops often cannot install bolts in critical areas during superstructure installation. For example, insufficient operating space due to parts obstructing the work may necessitate disassembling chassis components before bolt installation. In other words, there is a problem with mounting the subframe to the chassis when supersing a motorhome. Utility Model Content

[0004] The main purpose of this utility model is to propose a frame structure, a vehicle, and a vehicle, which aims to improve or solve the problem that it is difficult to install the subframe onto the chassis when building a motorhome.

[0005] To achieve the above objectives, the present invention proposes a frame structure for use in motorhomes, the frame structure comprising:

[0006] A vehicle frame, including a chassis and a subframe, wherein the chassis has a main longitudinal beam, and the subframe has a secondary longitudinal beam located above the main longitudinal beam; the chassis is used to mount the power drive system, and the subframe is used to mount the car body of the motorhome; and

[0007] The connecting device includes two mounting brackets respectively disposed on the main longitudinal beam and the secondary longitudinal beam, and the portions of the two mounting brackets exposed on the outer side of the main longitudinal beam are connected together.

[0008] In one embodiment, the mounting bracket includes a first plate portion and a second plate portion that are connected and intersecting. The first plate portion of the upper mounting bracket is mounted on the outer side of the main longitudinal beam, and the second plate portion extends outward from the first plate portion. The second plate portion of the lower mounting bracket is mounted on the outer side of the secondary longitudinal beam, and the second plate portion extends outward from the first plate portion. The two second plate portions are connected.

[0009] In one embodiment, the connecting device further includes a first elastic pad disposed between the two second plate portions.

[0010] In one embodiment, the connecting device includes a second elastic pad disposed between the main longitudinal beam and the secondary longitudinal beam.

[0011] In one embodiment, the vertical thickness of the second elastic pad is greater than the vertical thickness of the first elastic pad.

[0012] In one embodiment, the first elastic pad and the second elastic pad are separately molded.

[0013] In one embodiment, the second elastic pad includes at least two pads distributed in a vertical direction.

[0014] In one embodiment, the lower mounting bracket has a second plate portion located at the upper edge of the first plate portion, and the upper surface of the second plate portion is lower than or flush with the upper surface of the main longitudinal beam.

[0015] In one embodiment, the first plate portion of the upper mounting bracket is bolted to the secondary longitudinal beam.

[0016] In one embodiment, the first plate portion of the lower mounting bracket is bolted to the main longitudinal beam.

[0017] In one embodiment, the connecting device further includes a U-bolt and a connecting plate, the U-bolt being arranged around the main longitudinal beam and the secondary longitudinal beam and locked onto the connecting plate, the connecting plate being located on the upper or lower side of the secondary longitudinal beam.

[0018] In one embodiment, the gap between the U-bolt and the side of the main longitudinal beam is in the range of 0.3mm to 0.8mm, and the gap between the U-bolt and the side of the secondary longitudinal beam is in the range of 0.3mm to 0.8mm.

[0019] In one embodiment, the secondary longitudinal beam is a rectangular steel pipe, and the main longitudinal beam is a C-shaped steel with its opening facing inward.

[0020] In one embodiment, the mounting bracket is provided with main positioning holes and secondary positioning holes spaced apart in the front-to-back direction. The main positioning holes are round holes, and the secondary positioning holes are elongated holes extending in the left-to-right direction. The two main positioning holes of the mounting bracket are connected by bolts, and the two secondary positioning holes of the mounting bracket are connected by bolts.

[0021] This utility model also proposes a vehicle, including a power drive system, a motorhome cabin, and the aforementioned frame structure, wherein the motorhome cabin is mounted on a subframe, and the power drive system is mounted on a chassis.

[0022] In this invention, before the subframe is assembled with the cargo box and functional components located on it, and before the superstructure (also known as assembly) is installed onto the chassis, two mounting brackets can be pre-installed on the main longitudinal beam and the secondary longitudinal beam, respectively. These brackets can be positioned in areas with ample operating space, depending on the distribution of functional components on the chassis and subframe. The exposed sections of the two mounting brackets on the side of the chassis are less susceptible to interference from already installed parts on the subframe, thus providing greater installation and operating space. During the superstructure installation, the exposed sections of the two mounting brackets are used for connection, ensuring a reliable and stable installation of the subframe onto the chassis. This solves the problem of difficulty in installing the subframe onto the chassis during the superstructure installation of motorhomes. Furthermore, compared to related technologies that require disassembly of chassis components during modification, this invention eliminates the need for chassis component disassembly, thereby improving modification efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 A schematic diagram of an embodiment of the vehicle frame structure provided by this utility model;

[0025] Figure 2 for Figure 1 Front view of the structure shown;

[0026] Figure 3 for Figure 2 A schematic diagram of the structure at point A in the middle;

[0027] Figure 4 for Figure 3 A schematic diagram of the structure of the mounting bracket;

[0028] Figure 5 for Figure 2 A schematic diagram of the structure at point B.

[0029] Explanation of icon numbers:

[0030] 101. Main longitudinal beam; 102. Main transverse beam; 103. Secondary longitudinal beam; 104. Fasteners;

[0031] 210. Mounting bracket; 211. First plate; 212. Second plate; 213. Main positioning hole; 214. Secondary positioning hole; 220. First elastic pad; 230. Second elastic pad; 240. U-bolt; 250. Connecting plate.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] A motorhome, short for Recreational Vehicle, also known as a "home on wheels," combines the functions of a house and a vehicle, addressing the living needs of travelers. It integrates accommodation, dining, transportation, and entertainment, and is a mobile vehicle with essential home amenities, a product of a specific stage of social development. The People's Republic of China Automotive Industry Standard (QC / T776-2017) defines a motorhome as: a dedicated vehicle with an insulated cabin, equipped with tables and chairs, sleeping facilities (which can be converted from seating), cooking utensils, storage (including food and supplies), sanitary facilities, and necessary lighting and air conditioning, used for tourism and field work. A motorhome integrates "clothing, food, shelter, and transportation," enabling "living while traveling and traveling while living."

[0037] Currently, motorhomes, as a type of modified vehicle, are gradually becoming an essential mode of transportation for travelers. Structurally, motorhomes require a subframe. The longitudinal beams of the subframe are connected to the longitudinal beams of the chassis via bolts, welding, or other methods to create a higher and larger working surface on the chassis longitudinal beams, which is then used to install the motorhome's cabin.

[0038] Therefore, the subframe typically houses modular assemblies and components for the cabin, such as water tanks, air conditioners, and electric step stairs. Furthermore, because the bolts used to mount the subframe to the chassis longitudinal beams are usually installed directly from top to bottom through the subframe and chassis, conversion shops often cannot install bolts in critical areas during superstructure installation. For example, insufficient operating space due to parts obstructing the work may necessitate disassembling chassis components before bolt installation. In other words, there is a problem with mounting the subframe to the chassis when supersing a motorhome.

[0039] In view of this, the present invention proposes a frame structure that can be applied to motorhomes, thereby improving or solving the problem of difficulty in installing the subframe onto the chassis during the construction of motorhomes.

[0040] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the frame structure is applied to a motorhome. The frame structure includes a frame and a connecting device. The frame includes a chassis and a subframe. The chassis is used to install the power drive system (not shown in the drawings), and the subframe is used to install the motorhome's cabin (not shown in the drawings). The chassis and the subframe are connected by the connecting device.

[0041] Specifically, a power drive system includes a power source, a transmission mechanism, and wheels. The power source can be either an engine or a motor, and the transmission mechanism includes, but is not limited to, a gearbox. The power generated by the power source is transmitted to the wheels through the transmission mechanism, enabling the vehicle to move forward or backward. Of course, a transmission mechanism can also be omitted, and the power source can directly drive the wheels.

[0042] The RV's cabin includes the body and functional components located within the body. The body not only provides installation space for the various functional components but also provides activity space for the user. The functional components include, but are not limited to, air conditioners, lighting systems, sanitary facilities, water tanks, battery packs (for domestic power use), electric steps, etc., to enrich and improve the RV's functional experience.

[0043] Optionally, the chassis has a main longitudinal beam 101 (i.e., chassis longitudinal beam), and the subframe has a secondary longitudinal beam 103. The secondary longitudinal beam 103 is located on the upper side of the main longitudinal beam 101. The connecting device includes two mounting brackets 210 respectively located on the main longitudinal beam 101 and the secondary longitudinal beam 103. The portions of the two mounting brackets 210 exposed on the outer side of the main longitudinal beam 101 are connected to each other.

[0044] In this invention, before the subframe is assembled with the passenger compartment and functional components located on it, and before the superstructure (also known as assembly) is installed onto the chassis, two mounting brackets 210 can be pre-installed on the main longitudinal beam 101 and the secondary longitudinal beam 103, respectively. The two mounting brackets 210 can be positioned in areas with ample operating space, depending on the distribution of functional components on the chassis and subframe. The exposed structure of the two mounting brackets 210 on the side of the chassis is less susceptible to interference from already installed parts on the subframe, thus providing greater installation and operating space. During the superstructure installation, the exposed portions of the two mounting brackets 210 on the side of the chassis are used for connection, ensuring the subframe is reliably and stably installed on the chassis. This solves the problem of difficulty in installing the subframe onto the chassis during the superstructure installation of RVs. Furthermore, compared to related technologies that require disassembly of chassis components during modification, this invention eliminates the need for chassis component disassembly, thus improving modification efficiency.

[0045] It should be noted that the orientation concept mentioned in the embodiments of this utility model is based on the vehicle coordinate system, where longitudinal refers to the X-axis direction, lateral refers to the Y-axis direction, and vertical refers to the Z-axis direction.

[0046] Please see Figure 1Optionally, two main longitudinal beams 101 and two secondary longitudinal beams 103 are provided, with the two main longitudinal beams 101 spaced apart in the left-right direction and the two secondary longitudinal beams 103 spaced apart in the left-right direction. The chassis also includes multiple main crossbeams 102 (not shown in the figures) spaced apart in the front-rear direction, with the main crossbeams 102 connecting between the two main longitudinal beams 101. The subframe also includes multiple secondary crossbeams (not shown in the figures) spaced apart in the front-rear direction, with the secondary crossbeams connecting between the two secondary longitudinal beams 103. This design is simple and easy to implement, and improves the structural strength and rigidity of the chassis and subframe. Of course, in other embodiments, the main crossbeams 102 and secondary crossbeams may not be provided.

[0047] Please see Figure 3 and Figure 4 Optionally, the mounting bracket 210 includes a first plate portion 211 and a second plate portion 212 that are connected and intersecting. The first plate portion 211 of the upper mounting bracket 210 is mounted on the outer side of the main longitudinal beam 101, and the second plate portion 212 extends outward from the first plate portion 211. The second plate portion 212 of the lower mounting bracket 210 is mounted on the outer side of the secondary longitudinal beam 103, and the second plate portion 212 extends outward from the first plate portion 211. The two second plate portions 212 are connected. That is, the mounting bracket 210 is arranged in an L-shaped bracket structure, with the first plate portion 211 fitted against the outer side of the main longitudinal beam 101 or the secondary longitudinal beam 103, and the second plate portions 212 extending outward, so that the second plate portions 212 are naturally exposed on the outside of the main longitudinal beam 101 during the subframe mounting process.

[0048] Please see Figure 3 Optionally, the second plate portions 212 of the two mounting brackets 210 are connected by fasteners 104, wherein the fasteners 104 include, but are not limited to, bolts and rivets. For example, in this embodiment, the two second plate portions 212 are connected by two bolts. Thus, the structure is simple and easy to install. Of course, in other embodiments, the two second plate portions 212 can also be directly welded together.

[0049] Optionally, the first plate portion 211 of the upper mounting bracket 210 is bolted to the secondary longitudinal beam 103. This results in a simple and easy-to-install structure, ensuring the connection strength between the mounting bracket 210 and the secondary longitudinal beam 103, and facilitating subsequent disassembly and maintenance. Alternatively, in other embodiments, the upper mounting bracket 210 can be mounted to the secondary longitudinal beam 103 using rivets or other fasteners 104, or it can be directly welded to the secondary longitudinal beam 103.

[0050] Optionally, the first plate portion 211 of the lower mounting bracket 210 is bolted to the main longitudinal beam 101. This results in a simple and easy-to-install structure, ensuring the connection strength between the mounting bracket 210 and the main longitudinal beam 101, and facilitating disassembly and maintenance in the future. Alternatively, in other embodiments, the lower mounting bracket 210 can be mounted on the main longitudinal beam 101 using rivets or other fasteners 104, or it can be directly welded to the main longitudinal beam 101.

[0051] Please see Figure 3 Optionally, the connecting device further includes a first elastic pad 220, which is disposed between the two second plate portions 212. Thus, the addition of the first elastic pad 220 avoids the problem of easy wear caused by direct contact between the two second plate portions 212, resulting in a short service life of the mounting bracket 210, and also reduces the problem of difficulty in properly installing the two second plate portions 212 due to dimensional tolerances and assembly tolerances. Of course, in other embodiments, the first elastic pad 220 may not be provided.

[0052] Please see Figure 1 and Figure 2 Optionally, the connecting device includes a second elastic pad 230, which is disposed between the main longitudinal beam 101 and the secondary longitudinal beam 103. Thus, the added second elastic pad 230 can play a vibration damping role between the main longitudinal beam 101 and the secondary longitudinal beam 103, thereby avoiding the problem that direct rigid connection between the main longitudinal beam 101 and the secondary longitudinal beam 103 would cause chassis vibration to be easily transmitted to the car body, resulting in the car body being easily deformed by impact and poor passenger comfort.

[0053] Please see Figure 2 Optionally, the vertical thickness of the second elastic pad 230 is greater than the vertical thickness of the first elastic pad 220. Specifically, the second elastic pad 230 is the component that plays the main role in vibration damping, so setting its vertical thickness to be larger is beneficial to improving its vibration damping effect. For example, the vertical thickness of the second elastic pad 230 ranges from 5mm to 40mm, specifically 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, etc. The first elastic pad 220 mainly functions to accommodate installation errors between the two second plate portions 212. For example, the vertical thickness of the first elastic pad 220 ranges from 2mm to 10mm. Therefore, by setting the vertical thicknesses of the first elastic pad 220 and the second elastic pad 230 to be different, with the former being smaller and the latter larger, it is beneficial to reduce the material cost of both while fully exerting their beneficial effects, thereby reducing the modification cost of the RV. Of course, in other embodiments, the vertical thickness of the second elastic pad 230 may be less than or equal to the vertical thickness of the first elastic pad 220.

[0054] Optionally, the first elastic pad 220 and the second elastic pad 230 are separately molded. That is, the first elastic pad 220 and the second elastic pad 230 are two independent parts, which are manufactured and installed separately between the main longitudinal beam 101 and the secondary longitudinal beam 103, and between the two second plate portions 212. This facilitates the manufacturing of both parts and their subsequent installation on the chassis and subframe. In particular, when the requirements for physical parameters such as vertical thickness and elastic modulus are different, the separate arrangement helps to meet their respective performance requirements. Of course, in other embodiments, the first elastic pad 220 and the second elastic pad 230 can also be integrally molded, in which case even if the vertical thicknesses of the two parts are different, it can be achieved during integral molding.

[0055] Please see Figure 5 Optionally, the second elastic pad 230 includes at least two pads distributed in the vertical direction. That is, the second elastic pad 230 is constructed by stacking at least two pads in sequence. This facilitates the adjustment of the performance parameters of the second elastic pad 230 and helps to improve the yield rate of the second elastic pad 230. In this embodiment, the number of pads is two, but in other embodiments, the number of pads may be three or more.

[0056] Please see Figure 3 Optionally, the second plate portion 212 of the lower mounting bracket 210 is located at the upper edge of the first plate portion 211, and the upper surface of the second plate portion 212 is lower than or flush with the upper surface of the main longitudinal beam 101. That is, in the upward direction, the lower mounting bracket 210 does not protrude from the main longitudinal beam 101. In this way, the lower mounting bracket 210 can be prevented from interfering with the subframe superstructure operation. Of course, in other embodiments, the upper surface of the second plate portion 212 may be higher than the upper surface of the main longitudinal beam 101; or the second plate portion 212 of the lower mounting bracket 210 may be located at the lower edge or middle of the first plate portion 211.

[0057] Optionally, the second plate portion 212 of the upper mounting bracket 210 is located at the lower edge of the first plate portion 211, and the connection point of the two second plate portions 212 corresponds to the second elastic pad 230. This results in a simple and easy-to-implement structure, simplifying the structure of the two mounting brackets 210. Of course, in other embodiments, the second plate portion 212 of the upper mounting bracket 210 may also be located at the upper edge or middle of the first plate portion 211.

[0058] Please see Figure 1 and Figure 2Optionally, the connecting device also includes U-bolts 240 and connecting plates 250. The U-bolts 240 are arranged around the main longitudinal beam 101 and the secondary longitudinal beam 103 and are locked onto the connecting plate 250, which is located above or below the secondary longitudinal beam 103. Thus, the U-bolts 240 and connecting plates 250, in combination, provide positioning and constraint at least in the Z-axis direction, thereby preventing vertical separation and impact between the main longitudinal beam 101 and the secondary longitudinal beam 103. Furthermore, the structure is simple and easy to implement. Secondly, the U-bolts 240 and the mounting bracket 210 together serve to install the subframe to the chassis, improving the installation reliability of the subframe and its upper body. The number of U-bolts 240 is not specifically limited. For example, this embodiment includes four U-bolts 240 and eight mounting brackets 210. Both the main longitudinal beam 101 and the secondary longitudinal beam 103 have two U-bolts 240 and two mounting brackets 210 spaced apart in the front-to-back direction. Each secondary longitudinal beam 103 also has two mounting brackets 210, and all four mounting brackets 210 are located between two U-bolts 240 on the same side. That is, four mounting brackets 210 are exposed on the left side of the main longitudinal beam 101, and the other four mounting brackets 210 are exposed on the right side of the main longitudinal beam 101. Of course, in other embodiments, the U-bolts 240 and the connecting plate 250 may not be provided.

[0059] Optionally, the gap between the U-bolt and the side of the main longitudinal beam 101 can range from 0.3mm to 0.8mm, for example, 0.4mm, 0.5mm, 0.6mm, etc. In this way, the U-bolt can also provide positioning constraint on the main longitudinal beam 101 in the Y-axis direction, thereby improving the installation stability and reliability of the subframe. Of course, in other embodiments, the gap between the U-bolt and the side of the main longitudinal beam 101 can also be other values, for example, 0 to 0.2mm, or 0.9mm to 5mm, etc.

[0060] Optionally, the gap between the U-bolt and the side of the sub-longitudinal beam 103 can range from 0.3mm to 0.8mm, for example, 0.4mm, 0.5mm, 0.6mm, etc. In this way, the U-bolt can also provide positioning constraint on the sub-longitudinal beam 103 in the Y-axis direction, thereby improving the installation stability and reliability of the subframe. Of course, in other embodiments, the gap between the U-bolt and the side of the sub-longitudinal beam 103 can also be other values, for example, 0 to 0.2mm, or 0.9mm to 5mm, etc.

[0061] Optionally, the secondary longitudinal beam 103 is a rectangular steel tube, and the main longitudinal beam 101 is a C-shaped steel with its opening facing inward. In this way, using a rectangular steel tube for the secondary longitudinal beam 103 improves its structural strength and rigidity, thereby enhancing the installation reliability of the subframe. Secondly, the C-shaped steel main longitudinal beam 101 meets the requirements, reducing the overall vehicle manufacturing cost. Of course, in other embodiments, both the secondary longitudinal beam 103 and the main longitudinal beam 101 can be C-shaped steel with their openings facing inward.

[0062] Please see Figure 4 Optionally, the mounting bracket 210 is provided with main positioning holes 213 and secondary positioning holes 214 spaced apart along the front-to-back direction. The main positioning holes 213 are circular holes, and the secondary positioning holes 214 are elongated holes extending along the left-to-right direction. The main positioning holes 213 of the two mounting brackets 210 are connected by bolts, and the secondary positioning holes 214 of the two mounting brackets 210 are also connected by bolts. When mounting on the subframe, a cylindrical pin is first used to position and engage with the main positioning hole 213. After the subframe is installed in place, the cylindrical pin is removed to allow for bolt installation. This improves the installation position accuracy of the subframe, thus facilitating subsequent assembly processes. The main positioning holes 213 and secondary positioning holes 214 can simultaneously achieve positioning constraints in the X and Y axes. Of course, in other embodiments, the main positioning holes 213 and secondary positioning holes 214 may not be provided.

[0063] This utility model also proposes a vehicle, which includes a power drive system, a motorhome cabin, and the aforementioned frame structure. The specific structure of the frame structure is as described in the above embodiments. Since this vehicle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here. The motorhome cabin is mounted on a subframe, and the power drive system is mounted on the chassis.

[0064] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A frame structure for use in motorhomes, characterized in that, The vehicle frame structure includes: A vehicle frame, including a chassis and a subframe, wherein the chassis has a main longitudinal beam, and the subframe has a secondary longitudinal beam located above the main longitudinal beam; the chassis is used to mount the power drive system, and the subframe is used to mount the car body of the motorhome; and The connecting device includes two mounting brackets respectively disposed on the main longitudinal beam and the secondary longitudinal beam, and the portions of the two mounting brackets exposed on the outer side of the main longitudinal beam are connected together.

2. The vehicle frame structure as described in claim 1, characterized in that, The mounting bracket includes a first plate portion and a second plate portion that are connected and intersecting. The first plate portion of the upper mounting bracket is mounted on the outer side of the main longitudinal beam, and the second plate portion extends outward from the first plate portion. The second plate portion of the lower mounting bracket is mounted on the outer side of the secondary longitudinal beam, and the second plate portion extends outward from the first plate portion. The two second plate portions are connected.

3. The frame structure as described in claim 2, characterized in that, The connecting device further includes a first elastic pad, which is disposed between the two second plates.

4. The frame structure as described in claim 3, characterized in that, The connecting device includes a second elastic pad, which is disposed between the main longitudinal beam and the secondary longitudinal beam.

5. The frame structure as described in claim 4, characterized in that, The vertical thickness of the second elastic pad is greater than the vertical thickness of the first elastic pad; And / or, the first elastic pad and the second elastic pad are separately molded; And / or, the second elastic pad includes at least two pads distributed in the up-down direction.

6. The frame structure as described in claim 2, characterized in that, The second plate portion of the lower mounting bracket is located at the upper edge of the first plate portion, and the upper surface of the second plate portion is lower than or flush with the upper surface of the main longitudinal beam; And / or, the first plate portion of the upper mounting bracket is bolted to the secondary longitudinal beam; And / or, the first plate portion of the lower mounting bracket is bolted to the main longitudinal beam.

7. The frame structure as described in claim 1, characterized in that, The connecting device also includes U-bolts and connecting plates. The U-bolts are arranged around the main longitudinal beam and the secondary longitudinal beam and are locked to the connecting plate, which is located on the upper or lower side of the secondary longitudinal beam.

8. The frame structure as described in claim 7, characterized in that, The gap between the U-bolt and the side of the main longitudinal beam is in the range of 0.3mm to 0.8mm, and the gap between the U-bolt and the side of the secondary longitudinal beam is in the range of 0.3mm to 0.8mm. And / or, the secondary longitudinal beam is a rectangular steel pipe, and the main longitudinal beam is a C-shaped steel with the opening facing inward.

9. The frame structure as described in claim 1, characterized in that, The mounting bracket is provided with main positioning holes and secondary positioning holes spaced apart in the front-to-back direction. The main positioning holes are round holes, and the secondary positioning holes are elongated holes extending in the left-to-right direction. The two main positioning holes of the mounting bracket are connected by bolts, and the two secondary positioning holes of the mounting bracket are connected by bolts.

10. A vehicle, characterized in that, The vehicle includes a power drive system, a motorhome cabin, and a frame structure as described in any one of claims 1 to 9, wherein the motorhome cabin is mounted on a subframe and the power drive system is mounted on a chassis.

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