Carbon fiber auxiliary frame and working method thereof

Abstract

A carbon fiber auxiliary frame and a working method thereof belong to the technical field of vehicle auxiliary frames, and are characterized in that a carbon fiber supporting frame is of a hollow structure, a left longitudinal supporting beam and a right longitudinal supporting beam are each provided with at least one air bag, and an air bag energy accumulator is arranged in a front transverse supporting beam and / or a rear transverse supporting beam; the air bags are respectively connected with at least one air bag energy accumulator through an electromagnetic reversing valve; pressure sensors are arranged on each air bag energy accumulator and each air bag; each airbag energy accumulator is provided with an inflation inlet extending out of the carbon fiber supporting frame; through the cooperative design of the carbon fiber supporting frame and the air bag assembly, the high tensile strength characteristic of the carbon fiber auxiliary frame can be effectively exerted, so that the characteristics of light weight, high strength, high specific strength, high specific modulus, fatigue resistance, shock absorption, high temperature resistance and the like are fully exerted, and the non-compression-resistant characteristic can be exerted when a vehicle is strongly impacted by the side face; therefore, the injury risk of passengers in the vehicle is reduced to the greatest extent.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle subframes, and in particular to a carbon fiber subframe and a working method thereof. Background Art

[0002] The subframe is an important load-bearing component of the vehicle, especially in the era of electric vehicles. In order to achieve lightweight, the subframe is preferably made of light alloy or even high-performance composite materials. The subframe supports the suspension, connects and installs other components such as motors, engines, steering gears, etc. in the chassis, so the subframe has requirements in terms of modality, stiffness, strength and fatigue. In order to meet the above performance requirements, the subframe usually uses high-performance and low-density materials, or even a combination of multiple materials, and how to select a manufacturing process that matches the material properties is also constantly being tried, so as to reduce its own weight, reduce energy consumption, and reduce vehicle carbon emissions while achieving higher performance.

[0003] On the other hand, vehicle safety has been a focus of the automotive industry since its inception. Although related technologies are constantly improving, they still face challenges. With the increase in the number of cars and the frequent occurrence of traffic accidents, the importance of automobile safety has become increasingly prominent. At present, collisions from the front of the vehicle can absorb energy through multi-stage deformation to reduce damage to the passenger compartment, while impacts from the side of the vehicle will directly act on the passenger compartment, causing greater damage and harm to the vehicle and the driver and passengers. At present, the damage caused by collisions to vehicles is reduced by adding side airbags, door beams, etc., but it is well known that the biggest risk caused by side collisions is that the vehicle rolls over or even rolls continuously, which is caused by hard force. Once it occurs, the above-mentioned side airbags, door beams and other protective measures will be far from enough in terms of protective effect.

[0004] Carbon fiber reinforced composite materials are composite materials formed by using carbon fiber or carbon fiber fabric as reinforcement and resin, ceramic, metal, etc. as matrix. They have high specific strength and high specific rigidity among many lightweight materials, and the lightweight effect is very obvious. They are currently used in automobile bodies and chassis parts. Carbon fiber reinforced composite materials are designable materials due to their anisotropic characteristics. In the current research and development of carbon fiber automobile bodies and chassis parts, how to design the ply angle and spatial structure has become the key to the lightweight level, which is also the focus of many automobile parts manufacturers. As we all know, traditional carbon fiber reinforced composite materials are famous for their high tensile strength, but their compressive performance is relatively weak. In order to overcome this problem, the carbon fiber subframes on the current market usually use aluminum alloy / high-strength foam material frames as embedded parts for internal support. However, the applicant believes that this approach is not the optimal solution for the following reasons: Although there is an aluminum alloy / high-strength foam material frame for internal support, this support only prevents the carbon fiber reinforced composite material from collapsing when it is impacted by external forces, but does not fully exert its high tensile strength characteristics. Only when the carbon fiber reinforced composite material exerts its high tensile strength performance can it fully exert its characteristics of light weight, high strength, high specific strength and modulus, fatigue resistance, shock absorption and high temperature resistance; Current carbon fiber subframes often blindly pursue high strength and lightweight, such as the above-mentioned aluminum alloy / high-strength foam material frame as an embedded part for internal support. However, at the same time, the weak compressive resistance of carbon fiber reinforced composite materials is not fully utilized. For example, when a vehicle is hit from the side, the strong rigid lateral thrust often causes the vehicle to roll over or even roll continuously, causing great damage to the safety of passengers. If the weak compressive resistance of carbon fiber reinforced composite materials can be complied with, the carbon fiber subframe will be damaged when the external impact force reaches the set value due to its non-compressive performance. At this time, it can not only absorb part of the energy of the side impact and alleviate the impact, but also the wheels connected to the subframe through the multi-link will be forced to lose support and fall off, and the falling of the wheels will help to further absorb and disperse the impact force, reduce the direct impact of the impact on the vehicle passenger compartment, and further reduce the risk of injury to the occupants in the vehicle.

[0005] Therefore, it is particularly necessary to invent a carbon fiber subframe that can not only exert high tensile strength but also exert non-compression resistance when the vehicle is hit from the side to reduce the risk of injury to the occupants in the vehicle. Summary of the invention

[0006] In view of the above problems, the present invention proposes a carbon fiber subframe and a working method thereof, and the technical solutions adopted are as follows: A carbon fiber subframe, comprising a carbon fiber support frame, assembly brackets arranged at the four corners of the carbon fiber support frame, and a connecting rod connecting bracket 1 and a connecting rod connecting bracket 2 arranged on the carbon fiber support frame; the carbon fiber support frame is made of carbon fiber reinforced composite material, comprising a left longitudinal support beam and a right longitudinal support beam, the left longitudinal support beam and the right longitudinal support beam are integrally fixedly connected by a front transverse support beam and a rear transverse support beam; it is characterized in that the carbon fiber support frame is a hollow structure, at least one pair of airbags are symmetrically arranged in the left longitudinal support beam and the right longitudinal support beam, an airbag accumulator is respectively arranged in the front transverse support beam and / or the rear transverse support beam, and the airbag is respectively connected to at least one airbag accumulator through an electromagnetic reversing valve; each of the airbag accumulator and the airbag is provided with a pressure sensor; each of the airbag accumulator is provided with an inflation port extending out of the carbon fiber support frame.

[0007] Furthermore, the electromagnetic reversing valve is a three-position three-way pneumatic electromagnetic reversing valve, the airbag is connected to the air inlet of the electromagnetic reversing valve, and is connected to one of the exhaust ports of the electromagnetic reversing valve of the airbag accumulator.

[0008] Furthermore, the airbag accumulator and the airbag are both high-elastic resin cavities with airtight properties, and are formed into an integrated structure with the carbon fiber support frame through pressure curing in an autoclave.

[0009] Furthermore, the second connecting rod connecting bracket is respectively arranged on the outer side of the middle part of the left longitudinal support beam and the right longitudinal support beam; the first connecting rod connecting bracket is arranged at the connection between the left longitudinal support beam, the right longitudinal support beam and the front transverse support beam and the rear transverse support beam.

[0010] Furthermore, the connecting rod connecting bracket 2 is fixed by a fixing ring 2 and positioned by a positioning pin 1.

[0011] Furthermore, the connecting rod connecting bracket 1 is fixed by a fixing ring 1 and is positioned by a positioning pin 2.

[0012] Furthermore, the fixing ring 1 and the fixing ring 2 are both made of carbon fiber composite materials, and are cured with the carbon fiber support frame by secondary pressurization in an autoclave.

[0013] A working method of a carbon fiber subframe, characterized in that: (i) When the pressure sensor on a certain airbag detects that the pressure is lower than the set value, a corresponding electromagnet in the electromagnetic reversing valve is energized, and the airbag is connected to the airbag accumulator, and the airbag accumulator replenishes air to the airbag. When the pressure sensor detects that the pressure reaches the standard value again, the electromagnetic reversing valve is closed; (ii) When the vehicle is hit from the side and the left longitudinal support beam or the right longitudinal support beam is impacted, causing the pressure sensor in the corresponding airbag to detect a pressure higher than the set value two, the other electromagnet in the electromagnetic reversing valve corresponding to the airbag with a pressure higher than the set value two and the other airbag symmetrical with it on the left and right becomes energized. At this time, the pair of airbags are connected with the external space, and the high-pressure gas in the airbags is discharged. The non-pressure-resistant characteristics of the corresponding left longitudinal support beam and the right longitudinal support beam are brought into play and the impact force is destroyed, actively forming a connection damage chain, and then the wheels connected to the subframe through the multi-link are forced to lose support and overturn and fall off.

[0014] Due to the adoption of the above technical solution, the present invention has the following advantages: Through the coordinated design of the carbon fiber support frame and the airbag assembly, the present invention can effectively bring into play the high tensile strength characteristics of the carbon fiber subframe, thereby giving full play to the characteristics of light weight and high strength, high specific strength and high specific modulus, fatigue resistance, shock absorption and high temperature resistance, and can also bring into play the non-compression resistance characteristics when the vehicle is subjected to a strong side impact, thereby minimizing the risk of injury to the occupants in the vehicle.

[0015] When the airbag pressure is too high due to a strong impact, the present invention actively forms a connected damage chain by simultaneously exhausting and reducing the pressure of a pair or several pairs of corresponding airbags that are symmetrically located in the left longitudinal support beam and the right longitudinal support beam, so that the wheels on both sides of the vehicle are forced to overturn and fall off at the same time under the external force. This not only effectively absorbs part of the energy of the side impact and alleviates the impact to the greatest extent, but also enables the frame of the impacted vehicle to move laterally instead of directly bearing a strong lateral thrust, which can effectively reduce the direct impact of the collision on the vehicle's passenger compartment, thereby further reducing the risk of injury to the occupants in the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 , 2 4 is a schematic diagram of the overall structure of the present invention.

[0017] Figure 3 For the present invention Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle.

[0018] Figure 5 For the present invention Figure 4 Schematic diagram of the cross-sectional structure at BB in the middle.

[0019] Figure 6 The figure is a schematic diagram of the assembly structure of the present invention without the carbon fiber support frame, the connecting rod connecting bracket 1 and the fixing ring 1.

[0020] Figure 7 Schematic diagram of the pneumatic principle of the airbag assembly.

[0021] Figure 8 Schematic diagram of an external vehicle side-impacting an ordinary vehicle.

[0022] Fig. 9 It is a schematic diagram of an external vehicle side-impacting the vehicle of this embodiment.

[0023] Figure Number: Carbon fiber support frame; 101-front transverse support beam; 102-rear transverse support beam; 103-left longitudinal support beam; 104-right longitudinal support beam; 2-Assemble the bracket; 3-Connecting rod connecting bracket 1; 4-fixing ring 1; 5-Connecting rod connecting bracket 2; 501- positioning pin 1; 6-fixing ring 2; 7- Airbag assembly; 701-airbag accumulator (701a-charging port); 702-electromagnetic reversing valve; 703-airbag; 8- Pressure sensor. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further specifically described below by way of embodiments and in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0025] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. Example

[0026] A carbon fiber subframe, such as Figure 1-2 and Figure 4-6 As shown, it includes a carbon fiber support frame 1, an assembly bracket 2 arranged at the four corners of the carbon fiber support frame 1, and a connecting rod connecting bracket 1 3 and a connecting rod connecting bracket 2 5 arranged on the carbon fiber support frame 1; the carbon fiber support frame 1 is made of carbon fiber reinforced composite material, including a left longitudinal support beam 103 and a right longitudinal support beam 104, and the left longitudinal support beam 103 and the right longitudinal support beam 104 are integrally fixedly connected through a front transverse support beam 101 and a rear transverse support beam 102; the carbon fiber support frame 1 is a hollow structure. In this embodiment, the left longitudinal support beam 103 and the right longitudinal support beam 104 are each provided with an airbag 703, and only the rear transverse support An airbag accumulator 701 is provided in the support beam 102, and each airbag 703 is connected to the airbag accumulator 701 through an electromagnetic reversing valve 702; each airbag accumulator 701 and airbag 703 are provided with a pressure sensor 8; each airbag accumulator 701 is provided with an inflation port 701a extending out of the carbon fiber support frame 1; the inflation port 701a can be an integrated inflation valve port with a high-pressure one-way valve, and a valve can also be installed thereon to achieve sealing. The present embodiment is an integrated inflation valve port; the pressure sensor 8 and the electromagnetic reversing valve 702 are both controlled by the vehicle's driving computer or an external control module.

[0027] As a specific solution of this embodiment, Figure 7 As shown, the electromagnetic reversing valve 702 is a three-position three-way pneumatic electromagnetic reversing valve, the airbag 703 is connected to the air inlet of the electromagnetic reversing valve 702, and the airbag accumulator 701 is connected to one of the exhaust ports of the electromagnetic reversing valve 702.

[0028] As a specific solution of this embodiment, the airbag accumulator 701 and the airbag 703 are both high elastic resin cavities with airtight properties, and are formed into an integrated structure with the carbon fiber support frame 1 through pressure curing in an autoclave, and are specifically implemented as follows: First, when the carbon fiber support frame 1 is being manufactured, the air pressure in the airbag accumulator 701 and the airbag 703 is in a state lower than the standard value, and the main function is to be able to closely adhere to the carbon fiber reinforced composite material used to manufacture the carbon fiber support frame 1; Then, the semi-finished product after the carbon fiber reinforced composite material layer laying action is sent to the autoclave for pressurization, and the airbag accumulator 701 and the airbag 703 are pressurized and solidified with the carbon fiber support frame 1; Finally, open the two electromagnetic reversing valves 702 and inflate the airbag accumulator 701 through the inflation port 701a. When the pressure in each airbag 703 reaches the standard value, the corresponding electromagnetic reversing valve 702 is automatically closed, and then the airbag accumulator 701 continues to be inflated. When the pressure in the airbag accumulator 701 reaches the standard value, the inflation is stopped.

[0029] As a specific solution of this embodiment, Figure 2 and 3 As shown, the connecting rod connecting bracket 25 is respectively arranged on the outer side of the middle part of the left longitudinal support beam 103 and the right longitudinal support beam 104; the connecting rod connecting bracket 13 is arranged at the connection between the left longitudinal support beam 103, the right longitudinal support beam 104 and the front transverse support beam 101 and the rear transverse support beam 102; the connecting rod connecting bracket 25 is fixed by a fixing ring 26 and positioned by a positioning pin 1501; the connecting rod connecting bracket 3 is fixed by a fixing ring 4 and positioned by a positioning pin 2; the fixing ring 14 and the fixing ring 26 are both made of carbon fiber composite materials, and are cured with the carbon fiber support frame 1 by secondary pressurization in an autoclave, that is, after the hot pressing and curing of the carbon fiber support frame 1 is completed, the fixing ring 14 and the fixing ring 26 are used to wrap the connecting rod connecting bracket 3 and the connecting rod connecting bracket 25 respectively for pre-forming, and then they are sent into the autoclave for secondary hot pressing, so that the fixing ring 14 and the fixing ring 26 are cured with the carbon fiber support frame 1.

[0030] The working method of the carbon fiber subframe of this embodiment is specifically as follows: (i) When the pressure sensor 8 on a certain airbag 703 detects that the pressure is lower than the set value 1, a corresponding electromagnet in the electromagnetic reversing valve 702 is energized, and the airbag 703 is connected with the airbag accumulator 701, and the airbag accumulator 701 replenishes air for the airbag 703. When the pressure sensor 8 detects that the pressure reaches the standard value again, the electromagnetic reversing valve 702 is closed; (ii) When the vehicle is hit from the side and the left longitudinal support beam 103 or the right longitudinal support beam 104 is impacted, causing the pressure sensor 8 in the corresponding airbag 703 to detect a pressure higher than the set value two, the other electromagnet in the electromagnetic reversing valve 702 corresponding to the airbag 703 with a pressure higher than the set value two and another airbag 703 symmetrical thereto are energized. At this time, the pair of airbags 703 are connected with the external space, and the high-pressure gas in the airbags 703 is discharged. The non-pressure-resistant characteristics of the corresponding left longitudinal support beam 103 and the right longitudinal support beam 104 are brought into play and the impact force is destroyed, actively forming a connection damage chain, and then the wheels connected to the subframe through the multi-link are forced to lose support and overturn and fall off. It should be noted here that the reason why the airbag 703 with a pressure higher than the set value 2 and the other airbag 703 which is symmetrical with it on the left and right are vented and decompressed at the same time in this embodiment is that such a design can ensure that the left longitudinal support beam 103 and the right longitudinal support beam 104 actively form a connected damage chain at a symmetrical position, so that the wheels on both sides are forced to overturn and fall off at the same time under the external force. This can not only effectively absorb part of the energy of the side impact and alleviate the impact to the greatest extent, but also enable the frame of the impacted vehicle to move laterally instead of directly bearing a strong lateral thrust, which can effectively reduce the direct impact of the collision on the vehicle's passenger compartment, thereby further reducing the risk of injury to the occupants in the vehicle.

[0031] Comparison Test: Comparative example: Figure 8 As shown, the ordinary vehicle that is hit uses an ordinary carbon fiber subframe that is common in the market and does not use an airbag assembly 7, and is hit from the side by an external force vehicle in a stationary or moving state; Example: Fig. 9 As shown, the vehicle of this embodiment that is hit uses the carbon fiber subframe of this embodiment that is provided with an airbag assembly 7, and is hit from the side by an external force vehicle in a stationary or moving state; Test results: Figure 8 As shown, the ordinary carbon fiber subframe of the hit ordinary vehicle cannot be damaged by itself when it is hit from the side. The strong hard lateral thrust will cause a large dent on the side of the hit ordinary vehicle, which often causes the vehicle to roll over or even roll over continuously, causing great damage to the safety of passengers. like Fig. 9As shown, the vehicle of the present embodiment that was hit adopts the carbon fiber subframe of the present embodiment. When the external impact force reaches the set value, the carbon fiber subframe is damaged due to its non-compression resistance. At this time, it can not only absorb part of the energy of the side impact and alleviate the impact, but also the wheels connected to the subframe through the multi-link will be forced to lose support and fall off. The falling off of the wheels helps to further absorb and disperse the impact force, reduce the direct impact of the impact on the vehicle passenger compartment, and thus further reduce the risk of injury to the occupants in the vehicle. Conclusion: When a vehicle adopting the subframe of this embodiment is hit by a strong side impact, the risk of injury to passengers in the vehicle can be better reduced.

Claims

1. A carbon fiber subframe, comprising a carbon fiber support frame (1), assembly brackets (2) arranged at four corners of the carbon fiber support frame (1), and a connecting rod connecting bracket 1 (3) and a connecting rod connecting bracket 2 (5) arranged on the carbon fiber support frame (1); the carbon fiber support frame (1) is made of carbon fiber reinforced composite material, comprising a left longitudinal support beam (103) and a right longitudinal support beam (104), the left longitudinal support beam (103) and the right longitudinal support beam (104) being integrally fixedly connected via a front transverse support beam (101) and a rear transverse support beam (102); characterized in that: The carbon fiber support frame (1) is a hollow structure, at least one pair of airbags (703) are symmetrically arranged in the left longitudinal support beam (103) and the right longitudinal support beam (104), an airbag accumulator (701) is respectively arranged in the front transverse support beam (101) and / or the rear transverse support beam (102), and the airbags (703) are respectively connected to at least one airbag accumulator (701) via an electromagnetic reversing valve (702); each of the airbag accumulators (701) and the airbags (703) is provided with a pressure sensor (8); and each of the airbag accumulators (701) is provided with an inflation port (701a) extending out of the carbon fiber support frame (1).

2. A carbon fiber subframe according to claim 1, characterized in that: The electromagnetic reversing valve (702) is a three-position three-way pneumatic electromagnetic reversing valve, the airbag (703) is connected to the air inlet of the electromagnetic reversing valve (702), and the airbag accumulator (701) is connected to one of the exhaust ports of the electromagnetic reversing valve (702).

3. The carbon fiber subframe according to claim 1, characterized in that: The airbag accumulator (701) and the airbag (703) are both highly elastic resin cavities with airtight properties, and are formed into an integrated structure with the carbon fiber support frame (1) through pressure curing in an autoclave.

4. The carbon fiber subframe according to claim 1, characterized in that: The second connecting rod connection bracket (5) is respectively arranged on the outer side of the middle part of the left longitudinal support beam (103) and the right longitudinal support beam (104); the first connecting rod connection bracket (3) is arranged at the connection between the left longitudinal support beam (103), the right longitudinal support beam (104) and the front transverse support beam (101), and the rear transverse support beam (102).

5. A carbon fiber subframe according to claim 4, characterized in that: The connecting rod connecting bracket 2 (5) is fixed by a fixing ring 2 (6) and positioned by a positioning pin 1 (501).

6. A carbon fiber subframe according to claim 5, characterized in that: The connecting rod connecting bracket 1 (3) is fixed by a fixing ring 1 (4) and positioned by a positioning pin 2.

7. A carbon fiber subframe according to claim 6, characterized in that: The fixing ring 1 (4) and the fixing ring 2 (6) are both made of carbon fiber composite materials, and are cured with the carbon fiber support frame (1) by means of secondary pressurization in an autoclave.

8. The method for operating a carbon fiber subframe according to claim 1, characterized in that: When the pressure sensor (8) on a certain airbag (703) detects that the pressure is lower than the set value, a corresponding electromagnet in the electromagnetic reversing valve (702) is energized, and the airbag (703) is connected to the airbag accumulator (701), and the airbag accumulator (701) replenishes air for the airbag (703). When the pressure sensor (8) detects that the pressure reaches the standard value again, the electromagnetic reversing valve (702) is closed; When the vehicle is hit from the side and the left longitudinal support beam (103) or the right longitudinal support beam (104) is impacted, causing the pressure sensor (8) in the corresponding airbag (703) to detect a pressure higher than the set value two, the other electromagnet in the electromagnetic reversing valve (702) corresponding to the airbag (703) with a pressure higher than the set value two and another airbag (703) symmetrical with it on the left and right is energized, and at this time, the pair of airbags (703) are connected to the external space, and the high-pressure gas in the airbag (703) is discharged, and the non-pressure-resistant characteristics of the corresponding left longitudinal support beam (103) and the right longitudinal support beam (104) are brought into play and the impact force is destroyed, actively forming a connection damage chain, and then the wheels connected to the subframe through the multi-link are forced to lose support and overturn and fall off.

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