A rear frame system integrating fuel tank and rear axle

Abstract

The present invention belongs to the field of vehicle engineering technology and specifically relates to a rear frame system integrating a fuel tank and a rear axle, comprising a fuel tank, a rear frame and a rear axle; the rear frame comprises a crush section and a first reinforcement section which are arranged in sequence from front to rear, the rear axle is mounted on the lower side of the crush section through a rear axle suspension, and the fuel tank is fixedly mounted on the lower side of the first reinforcement section; the front end of the first reinforcement section is flush with the front end of the fuel tank, the rear end of the crush section extends beyond the rear end of the rear axle, the front end of the crush section extends at least to the front end of the rear axle, a first fitting surface is provided at the center of the front end of the fuel tank, and two second fitting surfaces are further provided at the front end of the fuel tank, the two second fitting surfaces are symmetrically arranged on the left and right sides of the first fitting surface; the crush section is used to crush and absorb energy when the rear end of the first reinforcement section is hit, the first fitting surface is used to fit with the rear side surface of the main cross beam of the rear axle after the crush section collapses, and the two second fitting surfaces are used to fit with the rear side surfaces of the two rear axle suspensions after the crush section collapses.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle engineering, and in particular relates to a rear frame system integrating a fuel tank and a rear axle. Background Art

[0002] The increasing demands on hybrid vehicles for longer driving ranges are driving the need for greater space and higher requirements for battery placement. This has forced hybrid vehicle fuel tanks to be placed closer to the vehicle's edge (typically on the rear frame), making them more vulnerable to damage during a collision. A damaged fuel tank can leak fuel, pollute the environment, and potentially cause fires.

[0003] To address the above-mentioned problem, in the prior art, the fuel tank is typically positioned in a non-deformable area (i.e., the fuel tank is mounted on a reinforced section of the rear frame) to minimize collisions between the fuel tank and other components during a collision. However, due to the height of the rear frame, the crumple zone of the rear frame is generally insufficient to ensure stable energy absorption during a collision (primarily because the height limits the contact area between the rear end of the rear frame and the rear impacting vehicle). When the conventional rear frame is subjected to a side and rear impact, although crumple zone guide grooves can be provided to guide the crumple zone's direction of collapse, it is still difficult to ensure that the crumple zone deforms stably in the fore-aft direction of the vehicle. The crumple zone often still deforms to a certain extent in the left-right and / or up-down directions, resulting in significant relative displacement between the fuel tank and other components in additional directions (left-right and up-down), increasing the number of other components impacted by the fuel tank and increasing the risk of damage to the fuel tank. Summary of the Invention

[0004] In order to address the above-mentioned deficiencies of the prior art, the present invention provides a rear frame system integrating a fuel tank and a rear axle to solve the technical problem that, when the existing rear frame is subjected to a side and rear impact, although a crush guide groove can be provided on the crush section to guide the crush direction of the crush section, it is still difficult to ensure that the crush section deforms stably in the front-to-back direction of the vehicle. The crush section often still undergoes certain deformation in the left-right direction and / or the up-down direction, resulting in a large relative displacement between the fuel tank and other components in additional directions (left-right direction and up-down direction), causing the number of other components hit by the fuel tank to increase, thereby increasing the risk of damage to the fuel tank.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] A rear frame system integrating a fuel tank and a rear axle, comprising a fuel tank, a rear frame and a rear axle;

[0007] The rear frame includes a crush section and a first reinforcement section arranged in sequence from front to rear, the rear axle is mounted on the lower side of the crush section via left and right rear axle suspensions, and the fuel tank is fixedly mounted on the lower side of the first reinforcement section;

[0008] The front end of the first reinforcement section is flush with the front end of the fuel tank, the rear end of the crush section extends beyond the rear end of the rear axle, and the front end of the crush section extends beyond the front end of the rear axle or is flush with the front end of the rear axle. A first fitting surface is provided at the center of the front end of the fuel tank, and two second fitting surfaces are further provided at the front end of the fuel tank, and the two second fitting surfaces are symmetrically provided on the left and right sides of the first fitting surface.

[0009] The crush section is used to crush and absorb energy when the rear end of the first reinforcement section is hit. The first fitting surface is used to fit with the rear side surface of the main cross beam of the rear axle after the crush section collapses. The two second fitting surfaces are used to fit with the rear side surfaces of the left rear axle suspension and the rear side surfaces of the right rear axle suspension respectively after the crush section collapses.

[0010] By arranging the first reinforcement section behind the crush section, and then installing the rear axle and the fuel tank on the crush section and the first reinforcement section respectively, and reserving a gap between the rear axle and the fuel tank (achieved by making the front end of the first reinforcement section flush with the front end of the fuel tank and the rear end of the crush section extending beyond the rear end of the rear axle), when a vehicle equipped with the rear frame system with an integrated fuel tank and rear axle provided by the present invention is subjected to a rear impact (including a direct rear impact and an oblique rear impact), the rear side surface of the fuel tank and the rear side surface of the rear frame (that is, the first reinforcement section) are not affected by the impact. The rear end of the reinforcement section) can jointly form a contact surface with the rear impact vehicle, thereby increasing the contact area with the rear impact vehicle. This can effectively reduce the deformation of the crumple section in the left-right direction and / or the up-down direction when the vehicle is hit from behind, thereby improving the energy absorption stability of the crumple section. Furthermore, when the crumple section collapses, it can effectively reduce the relative displacement between the fuel tank and other components in the left-right direction and / or the up-down direction. When the vehicle is hit from behind, the fuel tank only collides with the rear axle and the rear axle suspension, thereby reducing the number of components hit by the fuel tank and reducing the risk of fuel tank damage.

[0011] And after the collapse section collapses, as long as the fuel tank hits the rear axle (that is, the first fitting surface contacts the rear side surface of the main cross beam of the rear axle), or the fuel tank hits the left rear axle suspension or the right rear axle suspension (that is, the second fitting surface contacts the rear side surface of the left rear axle suspension, or the second fitting surface contacts the rear side surface of the right rear axle suspension), a second impact load transfer channel (that is, a load transfer channel from the fuel tank to the rear axle) in addition to the rear longitudinal beam of the rear frame can be generated in the rear frame system of the integrated fuel tank and rear axle provided by the present invention, thereby further improving the stability of load transfer, so that in the subsequent process until the fuel tank is pressed against the rear axle, the left rear axle suspension and the right rear axle suspension, the deformation of the collapse section in the left-right direction and / or the up-down direction can be further reduced, thereby improving the energy absorption stability of the collapse section.

[0012] Furthermore, the fuel tank includes a first fuel tank body and an exoskeleton, wherein the exoskeleton is wrapped around the first fuel tank body and fixedly connected to the first fuel tank body.

[0013] Since the fuel tank serves as part of the impact load transfer channel (i.e., the second impact load transfer channel) in the rear frame system integrating the fuel tank and the rear axle provided by the present invention, providing an exoskeleton outside the first fuel tank body of the fuel tank can effectively improve the overall structural strength of the fuel tank to meet the load transfer requirements, and can protect the first fuel tank body from direct impact during an impact, making the fuel tank less likely to rupture during a collision.

[0014] Furthermore, the exoskeleton includes a first main frame, a first frame assembly and two second frame assemblies that are connected in a horizontal and vertical staggered manner;

[0015] The first main frame and the two second frame components are both surrounded outside the first tank body in the front-to-back direction, and the first frame component is surrounded outside the first tank body in the left-to-right direction; the first main frame is arranged in the middle of the first tank body in the left-to-right direction, and the two second frame components are symmetrically arranged on the left and right sides of the first main frame; the first fitting surface is arranged on the front side surface of the first main frame, and a second fitting surface is arranged on the front side surfaces of the two second frame components.

[0016] By setting the first fitting surface on the front side surface of the first main frame, a second fitting surface is set on the front side surfaces of the two second frame components, so that the first fitting surface and the two second fitting surfaces are both set on the exoskeleton, the exoskeleton can bear the impact load during the transmission of the impact load, thereby avoiding direct impact on the first tank body.

[0017] Furthermore, the first frame assembly includes a plurality of first frames spaced apart in the front-to-rear direction, and each of the first frames surrounds the first fuel tank body in the left-to-right direction.

[0018] Furthermore, the second frame assembly includes at least one second frame, each second frame is surrounded by the first tank body in the front-to-back direction, and one of the second frames in the second frame assembly is arranged corresponding to the left rear axle suspension or the right rear axle suspension on the same side, and a second fitting surface is provided on the front side surface of the second frame.

[0019] Furthermore, the fuel tank includes a second fuel tank body and an inner frame, and the second fuel tank body is covered outside the inner frame and fixedly connected to the inner frame.

[0020] Since the fuel tank in the rear frame system with an integrated fuel tank and rear axle provided by the present invention serves as part of the impact load transfer channel (i.e., the aforementioned second impact load transfer channel), an internal skeleton is provided within the second fuel tank body of the fuel tank to provide support for the second fuel tank body, effectively improving the overall structural strength of the fuel tank to meet load transfer requirements and making the fuel tank less susceptible to rupture during a collision.

[0021] Furthermore, the inner frame includes a second main frame, a third frame assembly and two fourth frame assemblies that are connected in a horizontal and vertical staggered manner;

[0022] The second main frame and the two fourth frame assemblies are both surrounded by the second tank body in the front-to-back direction, and the third frame assembly is surrounded by the second tank body in the left-to-right direction; the second main frame is arranged in the middle of the second tank body in the left-to-right direction, and the two fourth frame assemblies are symmetrically arranged on the left and right sides of the second main frame; the first fitting surface and the two second fitting surfaces are both arranged on the front side surface of the second tank body, the first fitting surface is arranged corresponding to the second main frame, and the second fitting surface is arranged corresponding to the fourth frame assembly on the same side.

[0023] By setting the first fitting surface corresponding to the second main frame and the second fitting surface corresponding to the fourth frame assembly on the same side, when the fuel tank collides with the rear axle, the left rear axle suspension and the right rear axle suspension, the second main frame can support the first fitting surface, and the fourth frame assembly can support the second fitting surface on the same side, so as to prevent the first fitting surface and the two second fitting surfaces from being squeezed and deformed, causing the second fuel tank body to rupture.

[0024] Furthermore, the third frame assembly includes a plurality of third frames spaced apart along the front-to-rear direction, and each of the third frames surrounds the second fuel tank body along the left-to-right direction.

[0025] Furthermore, the fourth frame assembly includes at least one fourth frame, each of the fourth frames surrounds the second tank body along the front-to-back direction, and one of the fourth frames in the fourth frame assembly is arranged corresponding to the second fitting surface on the same side.

[0026] Furthermore, the rear frame also includes a second reinforcement section arranged on the front side of the crush section; the upper side of the rear end of the second reinforcement section is used to be fixedly connected to the front end of the crush section, and the lower side of the rear end of the second reinforcement section is used to abut against the front side surface of the rear axle after the crush section collapses; the front end of the second reinforcement section is used to be fixedly connected to the rear end of the battery pack.

[0027] By arranging the second reinforcement section on the front side of the crush section, and making the lower side of the rear end of the second reinforcement section abut against the front side surface of the rear axle after the crush section collapses, the lower side of the second reinforcement section becomes a part of the aforementioned second impact load transmission channel. After the collision occurs, when the fuel tank is pressed against the rear axle and pushes the rear axle forward, the second reinforcement section can provide support for the rear axle to prevent the forward movement of the rear axle, and block between the rear axle and the battery pack, thereby protecting the battery pack when the vehicle is subjected to a rear collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 This is a schematic diagram of the structure of the rear frame system integrating the fuel tank and rear axle in Example 1. Figure 1 ;

[0030] Figure 2 This is a schematic diagram of the structure of the rear frame system integrating the fuel tank and rear axle in Example 1. Figure 2 ;

[0031] Figure 3 is a schematic structural diagram of the exoskeleton in Example 1;

[0032] Among them, 1 - fuel tank, 2 - collapse section, 3 - first reinforcement section, 4 - second reinforcement section, 5 - rear axle, 6 - rear axle suspension, 7 - battery pack;

[0033] 1.1—first main frame, 1.2—first frame, 1.3—second frame;

[0034] 1.1.1.—First bonding surface, 1.3.1—Second bonding surface. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] Example 1:

[0037] like Figures 1 to 3 As shown, embodiment 1 provides a rear frame system integrating a fuel tank and a rear axle, comprising a fuel tank 1, a rear frame and a rear axle 5;

[0038] The rear frame includes a crush section 2 and a first reinforcement section 3 arranged in sequence from front to rear. The rear axle 5 is mounted on the lower side of the crush section 2 via two rear axle mounts 6 (left and right rear axle mounts). The fuel tank 1 is fixedly mounted on the lower side of the first reinforcement section 3.

[0039] The front end of the first reinforcement section 3 is flush with the front end of the fuel tank 1. The rear end of the crush section 2 extends beyond the rear end of the rear axle 5. The front end of the crush section 2 extends beyond the front end of the rear axle 5 or is flush with the front end of the rear axle 5. A first affixed surface 1.1.1 is provided at the center of the front end of the fuel tank 1. The front end of the fuel tank 1 is also provided with two second affixed surfaces 1.3.1, which are symmetrically arranged on the left and right sides of the first affixed surface 1.1.1.

[0040] The crush section 2 is used to collapse and absorb energy when the rear end of the first reinforcement section 3 is hit. The first bonding surface 1.1.1 is used to bond with the rear side surface of the main crossbeam of the rear axle 5 after the crush section 2 collapses. The two second bonding surfaces 1.3.1 are used to bond with the rear side surfaces of the left rear axle suspension and the rear side surfaces of the right rear axle suspension respectively after the crush section 2 collapses.

[0041] By arranging the first reinforcement section 3 behind the crush section 2, and then installing the rear axle 5 and the fuel tank 1 on the crush section 2 and the first reinforcement section 3 respectively, and reserving a gap between the rear axle 5 and the fuel tank 1 (achieved by making the front end of the first reinforcement section 3 flush with the front end of the fuel tank 1, and the rear end of the crush section 2 extending beyond the rear end of the rear axle 5), when a vehicle equipped with the rear frame system with an integrated fuel tank and rear axle provided by the present invention is subjected to a rear impact (including a direct rear impact and an oblique rear impact), the rear side of the fuel tank 1 and the rear side of the rear frame (that is, the rear end of the first reinforcement section 3) can The two parts can jointly form a contact surface with the rear impact vehicle, thereby increasing the contact area with the rear impact vehicle, effectively reducing the deformation of the crush section 2 in the left-right direction and / or the up-down direction when the vehicle is hit from the rear, improving the energy absorption stability of the crush section 2, and further effectively reducing the relative displacement between the fuel tank 1 and other components in the left-right direction and / or the up-down direction when the crush section 2 collapses, so that when the vehicle is hit from the rear, the fuel tank 1 only collides with the rear axle 5 and the rear axle suspension 6, reducing the number of parts hit by the fuel tank 1 and reducing the risk of damage to the fuel tank 1;

[0042] And after the collapse section 2 collapses, as long as the fuel tank 1 hits the rear axle 5 (that is, the first fitting surface 1.1.1 contacts the rear side of the main crossbeam of the rear axle 5), or the fuel tank 1 hits the left rear axle suspension or the right rear axle suspension (that is, the second fitting surface 1.3.1 contacts the rear side of the left rear axle suspension, or the second fitting surface 1.3.1 contacts the rear side of the right rear axle suspension), a second impact load transfer channel (that is, the load transfer channel from the fuel tank 1 to the rear axle 5) in addition to the rear longitudinal beam of the rear frame can be generated in the rear frame system of the integrated fuel tank and rear axle provided by the present invention, further improving the stability of the load transfer, so that in the subsequent process until the fuel tank 1 is pressed against the rear axle 5, the left rear axle suspension and the right rear axle suspension, the deformation of the collapse section 2 in the left and right directions and / or the up and down directions can be further reduced, thereby improving the energy absorption stability of the collapse section 2.

[0043] In one embodiment, Figure 3 As shown, the fuel tank 1 includes a first fuel tank 1 body and an exoskeleton. The exoskeleton is wrapped around the first fuel tank 1 body and fixedly connected to the first fuel tank 1 body.

[0044] Since the fuel tank 1 serves as a part of the impact load transfer channel (i.e., the second impact load transfer channel) in the rear frame system of the integrated fuel tank and rear axle provided by the present invention, an exoskeleton is provided outside the first fuel tank 1 body of the fuel tank 1, which can effectively improve the overall structural strength of the fuel tank 1 to meet the load transfer requirements, and can protect the first fuel tank 1 body from direct impact during the impact process, so that the fuel tank 1 is not easily broken during the collision.

[0045] The structure and size of the exoskeleton can be determined by means of impact simulation.

[0046] In one embodiment, Figure 3 As shown, the exoskeleton comprises a first main frame 1.1, a first frame 1.2 assembly and two second frame 1.3 assemblies connected in a horizontal and vertical staggered manner;

[0047] The first main frame 1.1 and the two second frame 1.3 components are all surrounded outside the first fuel tank 1 body in the front-to-back direction, and the first frame 1.2 component is surrounded outside the first fuel tank 1 body in the left-right direction; the first main frame 1.1 is arranged in the middle of the first fuel tank 1 body in the left-right direction, and the two second frame 1.3 components are symmetrically arranged on the left and right sides of the first main frame 1.1; the first fitting surface 1.1.1 is arranged on the front side surface of the first main frame 1.1, and a second fitting surface 1.3.1 is provided on the front side surfaces of the two second frame 1.3 components.

[0048] By setting the first fitting surface 1.1.1 on the front side surface of the first main frame 1.1, a second fitting surface 1.3.1 is set on the front side surfaces of the two second frame 1.3 components, so that the first fitting surface 1.1.1 and the two second fitting surfaces 1.3.1 are all set on the exoskeleton, so that during the impact load transmission process, the impact load can be borne by the exoskeleton, thereby avoiding direct impact on the first fuel tank 1 body.

[0049] In one embodiment, Figure 3 As shown, the first frame 1.2 assembly includes a plurality of first frames 1.2 spaced apart along the front-to-back direction, and each first frame 1.2 surrounds the first oil tank 1 body along the left-to-right direction.

[0050] In one embodiment, Figure 3 As shown, the second frame 1.3 assembly includes at least one second frame 1.3, and each second frame 1.3 is surrounded outside the first fuel tank 1 body in the front-to-back direction. One second frame 1.3 in the second frame 1.3 assembly is arranged corresponding to the left rear axle suspension or the right rear axle suspension on the same side, and a second fitting surface 1.3.1 is provided on the front side surface of the second frame 1.3.

[0051] Example 2:

[0052] The structure of the rear frame system with an integrated fuel tank and rear axle provided in Example 2 is similar to that of the rear frame system with an integrated fuel tank and rear axle provided in Example 1, except that:

[0053] In this embodiment 2, the fuel tank 1 includes a second fuel tank 1 body and an inner frame. The second fuel tank 1 body is covered on the outer side of the inner frame and is fixedly connected to the inner frame.

[0054] Since the fuel tank 1 serves as a part of the impact load transmission channel (i.e., the second impact load transmission channel) in the rear frame system of the integrated fuel tank and rear axle provided by the present invention, an internal skeleton is provided in the second fuel tank 1 body of the fuel tank 1 to support the second fuel tank 1 body, thereby effectively improving the overall structural strength of the fuel tank 1 to meet the load transmission requirements and making the fuel tank 1 less likely to rupture during a collision.

[0055] The inner frame includes a second main frame, a third frame assembly and two fourth frame assemblies connected in a horizontal and vertical staggered manner;

[0056] The second main frame and the two fourth frame assemblies are both surrounded outside the second fuel tank 1 body in the front-to-back direction, and the third frame assembly is surrounded inside the second fuel tank 1 body in the left-right direction; the second main frame is arranged in the middle of the second fuel tank 1 body in the left-right direction, and the two fourth frame assemblies are symmetrically arranged on the left and right sides of the second main frame; the first fitting surface 1.1.1 and the two second fitting surfaces 1.3.1 are both arranged on the front side surface of the second fuel tank 1 body, the first fitting surface 1.1.1 is arranged corresponding to the second main frame, and the second fitting surface 1.3.1 is arranged corresponding to the fourth frame assembly on the same side.

[0057] By setting the first fitting surface 1.1.1 corresponding to the second main frame and the second fitting surface 1.3.1 corresponding to the fourth frame assembly on the same side, when the fuel tank 1 collides with the rear axle 5, the left rear axle suspension and the right rear axle suspension, the second main frame can support the first fitting surface 1.1.1, and the fourth frame assembly can support the second fitting surface 1.3.1 on the same side to prevent the first fitting surface 1.1.1 and the two second fitting surfaces 1.3.1 from being squeezed and deformed, causing the second fuel tank 1 body to rupture.

[0058] Specifically, in this embodiment 2, the third frame assembly includes a plurality of third frames spaced apart along the front-to-back direction, and each third frame surrounds the second fuel tank 1 body along the left-to-right direction.

[0059] Specifically, in this embodiment 2, the fourth frame assembly includes at least one fourth frame, each fourth frame surrounds the second fuel tank 1 body along the front-to-back direction, and a fourth frame in the fourth frame assembly is arranged corresponding to the second fitting surface 1.3.1 on the same side.

[0060] Specifically, in this embodiment 2, the rear frame also includes a second reinforcement section 4 arranged on the front side of the crush section 2; the upper side of the rear end of the second reinforcement section 4 is used to be fixedly connected to the front end of the crush section 2, and the lower side of the rear end of the second reinforcement section 4 is used to abut against the front side of the rear axle 5 after the crush section 2 collapses; the front end of the second reinforcement section 4 is used to be fixedly connected to the rear end of the battery pack 7.

[0061] By arranging a second reinforcement section 4 on the front side of the crush section 2, and making the lower side of the rear end of the second reinforcement section 4 abut against the front side of the rear axle 5 after the crush section 2 collapses, the lower side of the second reinforcement section 4 becomes part of the aforementioned second impact load transmission channel. After the collision occurs, when the fuel tank 1 is pressed against the rear axle 5 and pushes the rear axle 5 forward, the second reinforcement section 4 can provide support for the rear axle 5 to prevent the forward movement of the rear axle 5, and block it between the rear axle 5 and the battery pack 7, so as to protect the battery pack 7 when the vehicle is subjected to a rear collision.

[0062] The rear frame system with integrated fuel tank and rear axle provided by the present invention has at least the following technical effects or advantages:

[0063] 1. By arranging the first reinforcement section 3 behind the crush section 2, and then installing the rear axle 5 and the fuel tank 1 on the crush section 2 and the first reinforcement section 3 respectively, and leaving a gap between the rear axle 5 and the fuel tank 1 (this is achieved by making the front end of the first reinforcement section 3 flush with the front end of the fuel tank 1 and the rear end of the crush section 2 extending beyond the rear end of the rear axle 5), when a vehicle equipped with the rear frame system with an integrated fuel tank and rear axle provided by the present invention is subjected to a rear impact (including a direct rear impact and an oblique rear impact), the rear side of the fuel tank 1 and the rear side of the rear frame (i.e., the rear end of the first reinforcement section 3) They can jointly form a contact surface with the rear impact vehicle, thereby increasing the contact area with the rear impact vehicle, effectively reducing the deformation of the crush section 2 in the left-right direction and / or the up-down direction when the vehicle is impacted from the rear, improving the energy absorption stability of the crush section 2, and further effectively reducing the relative displacement between the fuel tank 1 and other components in the left-right direction and / or the up-down direction when the crush section 2 collapses, so that when the vehicle is impacted from the rear, the fuel tank 1 only collides with the rear axle 5 and the rear axle suspension 6, reducing the number of components impacted by the fuel tank 1 and reducing the risk of damage to the fuel tank 1;

[0064] 2. After the crush section 2 collapses, as long as the fuel tank 1 hits the rear axle 5 (that is, the first fitting surface 1.1.1 contacts the rear side surface of the main crossbeam of the rear axle 5), or the fuel tank 1 hits the left rear axle suspension or the right rear axle suspension (that is, the second fitting surface 1.3.1 contacts the rear side surface of the left rear axle suspension, or the second fitting surface 1.3.1 contacts the rear side surface of the right rear axle suspension), a second impact load transfer channel (that is, a load transfer channel from the fuel tank 1 to the rear axle 5) in addition to the rear longitudinal beam of the rear frame can be generated in the rear frame system of the integrated fuel tank and rear axle provided by the present invention, further improving the stability of load transfer, so that in the subsequent process until the fuel tank 1 is pressed against the rear axle 5, the left rear axle suspension and the right rear axle suspension, the deformation of the crush section 2 in the left-right direction and / or the up-down direction can be further reduced, thereby improving the energy absorption stability of the crush section 2.

[0065] 3. Since the fuel tank 1 serves as a part of the impact load transmission channel (i.e., the second impact load transmission channel) in the rear frame system integrating the fuel tank and the rear axle provided by the present invention, an exoskeleton is provided outside the first fuel tank 1 body of the fuel tank 1. This can effectively improve the overall structural strength of the fuel tank 1 to meet the load transmission requirements, and can protect the first fuel tank 1 body from direct impact during an impact, so that the fuel tank 1 is not easily broken during a collision.

[0066] 4. By setting the first fitting surface 1.1.1 on the front side surface of the first main frame 1.1, and setting a second fitting surface 1.3.1 on the front side surfaces of the two second frame 1.3 components, the first fitting surface 1.1.1 and the two second fitting surfaces 1.3.1 are all set on the exoskeleton, so that during the impact load transmission process, the impact load can be borne by the exoskeleton, thereby preventing the first fuel tank 1 body from being directly impacted.

[0067] 5. Since the fuel tank 1 serves as part of the impact load transmission channel (i.e., the second impact load transmission channel) in the rear frame system integrating the fuel tank and rear axle provided by the present invention, an internal skeleton is provided within the second fuel tank 1 body of the fuel tank 1 to support the second fuel tank 1 body, thereby effectively improving the overall structural strength of the fuel tank 1 to meet the load transmission requirements and prevent the fuel tank 1 from rupturing during a collision.

[0068] 6. By setting the first fitting surface 1.1.1 in correspondence with the second main frame and the second fitting surface 1.3.1 in correspondence with the fourth frame assembly on the same side, when the fuel tank 1 collides with the rear axle 5, the left rear axle suspension and the right rear axle suspension, the second main frame can support the first fitting surface 1.1.1 and the fourth frame assembly can support the second fitting surface 1.3.1 on the same side to prevent the first fitting surface 1.1.1 and the two second fitting surfaces 1.3.1 from being squeezed and deformed, causing the second fuel tank 1 body to rupture.

[0069] 7. By arranging a second reinforcement section 4 on the front side of the crush section 2, and making the lower side of the rear end of the second reinforcement section 4 abut against the front side of the rear axle 5 after the crush section 2 collapses, the lower side of the second reinforcement section 4 becomes part of the aforementioned second impact load transmission channel. After the collision occurs, when the fuel tank 1 is pressed against the rear axle 5 and pushes the rear axle 5 forward, the second reinforcement section 4 can provide support for the rear axle 5 to prevent the rear axle 5 from moving forward, and is blocked between the rear axle 5 and the battery pack 7, thereby protecting the battery pack 7 when the vehicle is subjected to a rear collision.

[0070] The above are only specific application examples of the present invention and do not constitute any limitation to the protection scope of the present invention. Any technical solutions formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the present invention.

Claims

1. A rear frame system integrating a fuel tank and a rear axle, characterized by: Includes fuel tank, rear frame and rear axle; The rear frame includes a crush section and a first reinforcement section arranged in sequence from front to rear, the rear axle is mounted on the lower side of the crush section via left and right rear axle suspensions, and the fuel tank is fixedly mounted on the lower side of the first reinforcement section; The front end of the first reinforcement section is flush with the front end of the fuel tank, the rear end of the crush section extends beyond the rear end of the rear axle, and the front end of the crush section extends beyond the front end of the rear axle or is flush with the front end of the rear axle. A first fitting surface is provided at the center of the front end of the fuel tank, and two second fitting surfaces are further provided at the front end of the fuel tank, and the two second fitting surfaces are symmetrically provided on the left and right sides of the first fitting surface. The crush section is used to crush and absorb energy when the rear end of the first reinforcement section is hit. The first fitting surface is used to fit with the rear side surface of the main cross beam of the rear axle after the crush section collapses. The two second fitting surfaces are used to fit with the rear side surfaces of the left rear axle suspension and the rear side surfaces of the right rear axle suspension respectively after the crush section collapses.

2. The rear frame system with integrated fuel tank and rear axle according to claim 1, characterized in that: The fuel tank includes a first fuel tank body and an exoskeleton. The exoskeleton is wrapped around the first fuel tank body and fixedly connected to the first fuel tank body.

3. The rear frame system with integrated fuel tank and rear axle according to claim 2, characterized in that: The exoskeleton comprises a first main frame, a first frame assembly and two second frame assemblies that are staggered horizontally and vertically; The first main frame and the two second frame components are both surrounded outside the first tank body in the front-to-back direction, and the first frame component is surrounded outside the first tank body in the left-to-right direction; the first main frame is arranged in the middle of the first tank body in the left-to-right direction, and the two second frame components are symmetrically arranged on the left and right sides of the first main frame; the first fitting surface is arranged on the front side surface of the first main frame, and a second fitting surface is arranged on the front side surfaces of the two second frame components.

4. The rear frame system with integrated fuel tank and rear axle according to claim 3, characterized in that: The first frame assembly includes a plurality of first frames spaced apart in the front-to-rear direction, and each of the first frames surrounds the first fuel tank body in the left-to-right direction.

5. The rear frame system with integrated fuel tank and rear axle according to claim 3, characterized in that: The second frame assembly includes at least one second frame, and each second frame is surrounded by the first fuel tank body in the front-to-back direction. One of the second frames in the second frame assembly is arranged corresponding to the left rear axle suspension or the right rear axle suspension on the same side, and a second fitting surface is provided on the front side surface of the second frame.

6. The rear frame system with integrated fuel tank and rear axle according to claim 1, characterized in that: The fuel tank includes a second fuel tank body and an inner frame. The second fuel tank body is covered outside the inner frame and is fixedly connected to the inner frame.

7. The rear frame system with integrated fuel tank and rear axle according to claim 6, characterized in that: The inner frame comprises a second main frame, a third frame assembly and two fourth frame assemblies that are staggered horizontally and vertically; The second main frame and the two fourth frame assemblies are both surrounded by the second tank body in the front-to-back direction, and the third frame assembly is surrounded by the second tank body in the left-to-right direction; the second main frame is arranged in the middle of the second tank body in the left-to-right direction, and the two fourth frame assemblies are symmetrically arranged on the left and right sides of the second main frame; the first fitting surface and the two second fitting surfaces are both arranged on the front side surface of the second tank body, the first fitting surface is arranged corresponding to the second main frame, and the second fitting surface is arranged corresponding to the fourth frame assembly on the same side.

8. The rear frame system with integrated fuel tank and rear axle according to claim 7, characterized in that: The third frame assembly includes a plurality of third frames spaced apart in the front-to-rear direction, and each of the third frames surrounds the second fuel tank body in the left-to-right direction.

9. The rear frame system with integrated fuel tank and rear axle according to claim 7, characterized in that: The fourth frame assembly includes at least one fourth frame, each of which is surrounded in the second tank body along the front-to-back direction, and one of the fourth frames in the fourth frame assembly is arranged corresponding to the second fitting surface on the same side.

10. The rear frame system with integrated fuel tank and rear axle according to claim 1, characterized in that: The rear frame also includes a second reinforcement section arranged on the front side of the crush section, the upper side of the rear end of the second reinforcement section is used to be fixedly connected to the front end of the crush section, and the lower side of the rear end of the second reinforcement section is used to abut against the front side surface of the rear axle after the crush section collapses; the front end of the second reinforcement section is used to be fixedly connected to the rear end of the battery pack.

Images