A lightweight welding aluminum alloy subframe front cross beam and longitudinal beam mounting assembly

Abstract

The present application belongs to the technical field of aluminum alloy subframe, and provides a front cross beam and longitudinal beam mounting assembly of lightweight welded aluminum alloy subframe, which comprises a front cross beam and a longitudinal beam, the front cross beam is arranged at the front part of the longitudinal beam, one end of the longitudinal beam is connected to the rear part of the front cross beam, a vehicle body mounting bracket is connected between the front cross beam and the longitudinal beam, and the vehicle body mounting bracket is provided with a transmission connection structure for transmitting the collision force from the front cross beam to the longitudinal beam and dispersing the collision force to the intermediate cross beam and the rear casting. The present application has the advantages that the front cross beam, the longitudinal beam and the longitudinal beam are connected through the front vehicle body mounting bracket, which ingeniously solves the problem of height difference of the U-shaped groove position of the front cross beam and the longitudinal beam, and the collision force (or energy) transmitted in the harsh 25% small offset collision is dispersed to the intermediate cross beam and the rear casting of the subframe through the subframe energy absorption box mounting bracket, the front cross beam, the vehicle body mounting bracket and the longitudinal beam, and the small offset collision bending mode meets the target requirement.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aluminum alloy sub-frames, and relates to a front cross beam and longitudinal beam mounting assembly of a lightweight welded aluminum alloy sub-frame. BACKGROUND

[0002] Due to the simple layout of the front and rear power assemblies of an electric vehicle compared with those of a traditional fuel vehicle, the overall arrangement of the sub-frame is more flat, which provides application space for the aluminum profile welded sub-frame, and the aluminum profile has good formability and collapse characteristics, high production efficiency and high yield, and plays an important role in the front and rear crash beams, the threshold beams and the sub-frames and other crash safety structural parts of the vehicle, and application of the aluminum profile to the sub-frame is beneficial to the crash demand of the vehicle. SUMMARY

[0003] The application solves the problem that the sub-frame cannot meet the vehicle crash target in 100% frontal collision and 25% small offset collision.

[0004] The technical scheme adopted by the application to solve the above technical problem is as follows: a front cross beam and longitudinal beam mounting assembly of a lightweight welded aluminum alloy sub-frame, comprising a front cross beam and a longitudinal beam, the front cross beam is arranged at the front part of the longitudinal beam, one end of the longitudinal beam is connected to the rear part of the front cross beam, characterized in that a vehicle body mounting bracket is connected between the front cross beam and the longitudinal beam, and the vehicle body mounting bracket has a transmission connection structure for transmitting the collision force transmitted by the front cross beam to the longitudinal beam and dispersing the collision force to the intermediate cross beam and the rear casting.

[0005] In the above-mentioned front cross beam and longitudinal beam mounting assembly of a lightweight welded aluminum alloy sub-frame, the front cross beam is in an overall arc shape, and the front cross beam has three cavities, which are divided into a first cavity, a second cavity and a third cavity, and the first cavity, the second cavity and the third cavity are provided with reinforcing ribs.

[0006] In the above-mentioned front cross beam and longitudinal beam mounting assembly of a lightweight welded aluminum alloy sub-frame, the cross section of the vehicle body mounting bracket is in a sun shape, the vehicle body mounting bracket has a first cross section and a second cross section, and the transmission connection structure comprises a front stepped lap joint arranged at the front part of the first cross section and the front part of the second cross section and a rear stepped lap joint arranged at the rear part of the first cross section and the rear part of the second cross section.

[0007] In the aforementioned lightweight welded aluminum alloy subframe front crossbeam and longitudinal beam mounting assembly, a first lap weld connection surface is provided between the rear part of the first section at the rear stepped lap joint and the longitudinal beam, the first lap weld connection surface laps onto the upper side of the longitudinal beam, and a second lap weld connection surface is provided between the rear part of the second section at the rear stepped lap joint and the longitudinal beam, the second lap weld connection surface laps onto the lower side of the longitudinal beam.

[0008] In the aforementioned lightweight welded aluminum alloy subframe front crossbeam and longitudinal beam mounting assembly, energy-absorbing box mounting brackets are installed on both sides of the front part of the front crossbeam.

[0009] In the aforementioned lightweight welded aluminum alloy subframe front crossbeam and longitudinal beam mounting assembly, the longitudinal beam is divided into a left longitudinal beam and a right longitudinal beam, with a middle crossbeam connected between the left and right longitudinal beams. A crossbeam reinforcing bracket is connected between the middle crossbeam and the longitudinal beam, and the crossbeam reinforcing bracket is connected to the longitudinal beam and the middle crossbeam by an angled lap weld.

[0010] In the aforementioned lightweight welded aluminum alloy subframe front crossbeam and longitudinal beam mounting assembly, the body mounting bracket is provided with a body mounting sleeve.

[0011] In the aforementioned lightweight welded aluminum alloy subframe front crossbeam and longitudinal beam mounting assembly, the front crossbeam, longitudinal beam, and body mounting bracket are provided with stabilizer bar mounting brackets at their upper ends.

[0012] In the aforementioned lightweight welded aluminum alloy subframe front crossbeam and longitudinal beam mounting assembly, the longitudinal beam has a U-shaped groove at its front end and a stamped folding groove at the bottom of its rear end. The stamped folding groove is V-shaped, and a circular hole is provided at the top of the rear end of the longitudinal beam, with the circular hole located directly above the stamped folding groove.

[0013] Compared with the prior art, the advantages of this invention are that the front crossbeam, longitudinal beam and longitudinal beam are connected by the front body mounting bracket. On the one hand, it cleverly solves the problem of the height difference of the U-shaped groove position between the front crossbeam and the longitudinal beam. On the other hand, the body mounting bracket acts as a very important collision energy transfer bridge in the small offset collision process. The collision force (or energy) transmitted from the harsh 25% small offset frontal collision is distributed to the middle crossbeam of the subframe and the rear casting after passing through the subframe energy absorption box mounting bracket, the front crossbeam, the body mounting bracket and the longitudinal beam. The small offset collision bending mode meets the target requirements. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the front crossbeam and longitudinal beam mounting assembly structure of this lightweight welded aluminum alloy subframe;

[0015] Figure 2 This is a three-dimensional structural diagram of the front crossbeam;

[0016] Figure 3 This is a structural schematic diagram of the longitudinal beam;

[0017] Figure 4 This is a structural schematic diagram of the lightweight welded aluminum alloy subframe. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "center," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0020] In the figure, the front crossbeam is 100; the first cavity is 101; the second cavity is 102; the third cavity is 103; the reinforcing rib is 104; the longitudinal beam is 200; the energy-absorbing box mounting bracket is 300; the body mounting sleeve is 301; the stabilizer bar mounting bracket is 400; the U-shaped groove is 500; the stamped folding groove is 600; the circular hole is 700; the body mounting bracket is 800; the first section is 801; the second section is 802; the front stepped lap joint is 803; the rear stepped lap joint is 804; the first lap weld connection surface is 805; the second lap weld connection surface is 806; the middle crossbeam is 900; and the crossbeam reinforcing bracket is 1000.

[0021] like Figure 1 As shown, the lightweight welded aluminum alloy subframe front crossbeam 100 and longitudinal beam 200 mounting assembly includes a front crossbeam 100 and a longitudinal beam 200. The front crossbeam 100 is located at the front of the longitudinal beam 200, and one end of the longitudinal beam 200 is connected to the rear of the front crossbeam 100. Energy-absorbing box mounting brackets 300 are installed on both sides of the front of the front crossbeam 100, mainly to receive the impact force transmitted in a 25% small offset collision. A body mounting bracket 800 is provided with a body mounting sleeve 301 for installing one of the body mounting points. A stabilizer bar mounting bracket 400 is provided on the upper end of the front crossbeam 100, the longitudinal beam 200, and the body mounting bracket 800 for installing the stabilizer bar.

[0022] Specifically, such asFigure 2 As shown, the front crossbeam 100 is generally arc-shaped and has three cavities: a first cavity 101, a second cavity 102, and a third cavity 103. Reinforcing ribs 104 are located between the first cavity 101, the second cavity 102, and the third cavity 103. These reinforcing ribs 104 play a crucial role in the transfer of collision energy. The wall thickness of the front crossbeam 100 ranges from ±1mm, the length and width of the cavities range from ±10mm, and the angle variation ranges from ±10°, which can meet various subframe performance development requirements. The longitudinal beam 200 has a H-shaped cross-section, with a wall thickness ranging from ±2mm and a cross-sectional length and width ranging from ±15mm. In this patent, a vehicle body mounting bracket 800 connects the front crossbeam 100 and the longitudinal beam 200. The vehicle body mounting bracket 800 has a transmission connection structure that transmits the collision force from the front crossbeam 100 to the longitudinal beam 200 and disperses it to the intermediate crossbeam 900 and the rear casting. Here, this patent mainly uses the vehicle body mounting bracket 800 as a bridge for the transmission of collision energy. The collision force (or energy) transmitted in the harsh 25% small offset frontal collision is dispersed to the intermediate crossbeam 900 and the rear casting after passing through the subframe energy absorption box mounting bracket 300, the front crossbeam 100, the vehicle body mounting bracket 800, and the longitudinal beam 200. The small offset collision bending mode meets the target requirements.

[0023] like Figure 3 As shown, the longitudinal beam 200 has a U-shaped groove 500 at its front end and a stamped folding groove 600 at its rear end bottom. The stamped folding groove 600 is V-shaped. A circular hole 700 is located at the top of the rear end of the longitudinal beam 200, directly above the stamped folding groove 600. Due to the presence of the U-shaped groove 500, the entire longitudinal beam 200 will fold upwards. Simultaneously, due to the presence of the circular hole 700 and the V-shaped stamped folding groove 600, these elements act as inducing a crumple zone, directing energy to the rear end. A downward folding motion occurs at the stamped folding groove 600, thus enabling the subframe to achieve a crumple zone under rigid wall collision conditions. The bending mode and the collision crumple mode meet the requirements of the whole vehicle, and satisfy the vehicle's requirements for the subframe collision bending mode.

[0024] Specifically, the cross-section of the body mounting bracket 800 is in the shape of a Chinese character 'Ri'. The body mounting bracket 800 has a first cross-section 801 and a second cross-section 802. The transfer connection structure includes a front stepped lap joint 803 provided at the front of the first cross-section 801 and the front of the second cross-section 802, and a rear stepped lap joint 804 provided at the rear of the first cross-section 801 and the rear of the second cross-section 802. There is a first lap welding connection surface 805 between the rear part of the first cross-section 801 and the longitudinal beam 200 at the rear stepped lap joint 804. The first lap welding connection surface 805 overlaps the upper side part of the longitudinal beam 200. There is a second lap welding connection surface 806 between the rear part of the second cross-section 802 and the longitudinal beam 200 at the rear stepped lap joint 804. The second lap welding connection surface 806 overlaps the lower side part of the longitudinal beam 200. Here, through the front stepped lap joint 803 and the rear stepped lap joint 804, the connection problem of the height difference at the notch position of the U-shaped groove 500 between the front cross beam 100 and the longitudinal beam 200 can be solved. Here, through the first lap welding connection surface 805 and the second lap welding connection surface 806, on the one hand, the collision energy can be better transferred to the longitudinal beam 200 for transfer and absorption. In addition, the lap welding composed of two surfaces extends the weld length, improves the welding strength in this area, and reduces the fatigue risk. As Figure 4 shown, the longitudinal beam 200 is divided into a left longitudinal beam and a right longitudinal beam. An intermediate cross beam 900 is connected between the left longitudinal beam and the right longitudinal beam. A cross beam strengthening bracket 1000 is connected between the intermediate cross beam 900 and the longitudinal beam 200. The cross beam strengthening bracket 1000 is connected to the longitudinal beam 200 and the intermediate cross beam 900 by angular lap welding. The angular lap welding method is used for welding, providing the force support in the 25% small offset collision of the subframe. The performance indicators of the entire frame structure meet the requirements of the whole vehicle, and the welding lap structure is stable and reliable.

[0025] Moreover, extruded thin-wall aluminum profiles such as the front cross beam 100, the longitudinal beam 200, and the body mounting bracket 800 can be adjusted by the wall thickness of the profiles to meet the performance requirements of the subframe under different load conditions, with high flexibility, giving full play to the advantages of the extruded profile's collapse and energy absorption, meeting the requirements of the subframe's whole vehicle collision, with high safety, high yield rate of the profiles, high dimensional accuracy, and high production efficiency, reducing the product development and production costs.

[0026] The specific embodiments described in this article are only examples to illustrate the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the scope defined by the spirit of the present invention.

Claims

1. A front cross member and longitudinal beam mounting assembly for a lightweight welded aluminum alloy subframe comprising a front cross member and a longitudinal beam, said front cross member being positioned forwardly of said longitudinal beam, one end of said longitudinal beam being connected to the rear of said front cross member, characterized in that, The front cross beam and the longitudinal beam are connected with a vehicle body mounting bracket, the vehicle body mounting bracket has a transmission connection structure for transmitting the collision force from the front cross beam to the longitudinal beam and dispersing to the middle cross beam and the rear casting; the cross section of the vehicle body mounting bracket is in the shape of a sun, the vehicle body mounting bracket has a first cross section and a second cross section, the transmission connection structure is a front stepped lap joint at the front part of the first cross section and the front part of the second cross section and a rear stepped lap joint at the rear part of the first cross section and the rear part of the second cross section; the rear part of the first cross section at the rear stepped lap joint is connected with the longitudinal beam through a first lap welding connection surface, the first lap welding connection surface is lapped on the upper side of the longitudinal beam, the rear part of the second cross section at the rear stepped lap joint is connected with the longitudinal beam through a second lap welding connection surface, the second lap welding connection surface is lapped on the lower side of the longitudinal beam; the front end of the longitudinal beam is provided with a U-shaped groove, the bottom of the rear end of the longitudinal beam is provided with a stamping folded groove in the shape of a V, the top of the rear end of the longitudinal beam is provided with a circular hole, and the circular hole is located directly above the stamping folded groove.

2. The front cross rail and side rail mounting assembly of claim 1, wherein, The front cross beam is in the shape of an arc as a whole, and has three cavities, i.e., a first cavity, a second cavity and a third cavity, and the first cavity, the second cavity and the third cavity are connected with each other through reinforcing ribs.

3. The front cross member and rail mounting assembly of claim 1, wherein: The front part of the front cross beam is provided with energy absorption box mounting brackets on both sides.

4. The front cross rail and side rail mounting assembly of claim 1, wherein, The longitudinal beam is divided into a left longitudinal beam and a right longitudinal beam, and the left longitudinal beam and the right longitudinal beam are connected with a middle cross beam, the middle cross beam and the longitudinal beam are connected with a cross beam reinforcing bracket, and the cross beam reinforcing bracket is in an angular lap welding connection with the longitudinal beam and the middle cross beam.

5. The front cross rail and side rail mounting assembly of a welded aluminum alloy subframe of claim 1, wherein, The vehicle body mounting bracket is provided with a vehicle body mounting sleeve.

6. The front cross rail and side rail mounting assembly of a welded aluminum alloy subframe of claim 1, wherein, The front cross beam, the longitudinal beam and the upper end of the vehicle body mounting bracket are provided with stabilizer bar mounting brackets.

Images