CN113771951B - Rear longitudinal beam structure and new energy automobile - Google Patents

Abstract

The invention discloses a rear longitudinal beam structure and a new energy vehicle. The rear longitudinal beam structure includes a rear longitudinal beam body integrally formed by high-pressure casting, and the rear longitudinal beam body is divided into a first force-bearing part and a second force-bearing part part and the third force-receiving part, the level where the second force-receiving part is located is higher than the level where the first force-receiving part and the third force-receiving part are located, forming a first avoidance groove for adapting the chassis system, the third force-receiving part part is bent upwards in the vertical direction to form a second avoidance slot for the battery pack, the first force-receiving part extends inward along the vertical plane where the second force-receiving part is located to form a first extension part, and the third force-receiving part The force-receiving part extends outward along the plane where the second force-receiving part is located to form a second extension part, the end of the first force-receiving part is provided with a first installation part, and the end of the third force-receiving part is provided with a second In the second installation part, the inner surface and the outer surface of the rear longitudinal beam body are provided with reinforcing structures. The invention replaces the traditional welding technology of steel parts, and has good product consistency, low quality and few manufacturing processes.

Description

A rear longitudinal beam structure and new energy vehicle

technical field

The invention relates to the technical field of automobiles, in particular to a rear longitudinal beam structure and a new energy automobile.

Background technique

With the continuous development of new energy vehicle technology, its requirements for body performance are getting higher and higher. It is necessary to reduce the weight of the car and increase the rigidity of the body to achieve higher crashworthiness and battery collision safety performance. The rear longitudinal beam structure of the car is the main component of the car body, so the structural strength of the rear longitudinal beam is highly required to improve the rear collision performance of the car, thereby reducing the deformation of the rear longitudinal beam during the collision and protecting the car battery pack from damage. Squeeze to prevent the battery from catching fire. The rear longitudinal beam of the existing automobile is basically tailor-welded by a series of methods such as spot welding and CO2 shielded welding from sheet metal parts such as low-carbon steel plates. Tailored welding of multiple pieces of sheet metal has low structural strength and is easy to break during collision; the investment in welding equipment is large, and an additional electrophoresis process is required for anticorrosion, which takes a long time and involves many procedures, resulting in high production costs; the quality of the workpiece is large, increasing Body weight increases energy consumption. In addition, during the generation process, the actual stress of the rear longitudinal beam was not considered, resulting in uneven stress on different parts of the rear longitudinal beam, and long-term use will cause deformation, which seriously affects the force transmission performance of the rear longitudinal beam. During the collision, the rear longitudinal beam is easily deformed and squeezes the car battery pack, resulting in damage to the battery pack, which poses a major safety hazard. For example, a car rear longitudinal beam disclosed in Chinese patent literature, its notification number is CN201800774U, includes a rear longitudinal beam extension, a rear longitudinal beam body, a reinforcing bracket, and a spring seat, wherein the longitudinal beam extension and the rear longitudinal beam The body is overlapped at the position of the spring seat, and the reinforcement bracket is lined in the overlapping part of the extension part and the rear longitudinal beam body, and the spring seat is connected to the outside of the overlapping part.

Contents of the invention

The present invention aims to overcome the complex manufacturing process of the rear longitudinal beam of the existing new energy vehicles, the rear longitudinal beam has low structural strength and heavy weight, and when a collision occurs, it is easy to deform and squeeze the battery pack to cause further safety accidents , to provide a rear longitudinal beam structure and a new energy vehicle with high structural strength and light weight, which are not easy to deform and squeeze the battery pack during a collision.

In order to achieve the above object, the present invention adopts the following technical solutions:

A rear longitudinal beam structure, comprising a rear longitudinal beam body integrally formed by high-pressure casting, the rear longitudinal beam body is divided into a first force-receiving part, a second force-receiving part and a third force-receiving part, the second force-receiving part The horizontal plane where the part is located is higher than the horizontal plane where the first force-bearing part and the third force-bearing part are located, forming a first avoidance groove for adapting the chassis system, and the third force-receiving part bends upward in the vertical direction to form a groove for adapting to the battery pack. The second escape groove, the first force-receiving part extends inward along the vertical plane where the second force-receiving part is located to form a first extension part, and the third force-receiving part extends outward along the plane where the second force-receiving part is located A second extension part is formed, a first installation part is provided at the end of the first force receiving part, a second installation part is provided at the end of the third force receiving part, the inner surface of the rear longitudinal beam body and the Reinforcing structures are provided on the outer surfaces. When the new energy vehicle collides, the first force-receiving part, the second force-receiving part, and the third force-receiving part of the rear longitudinal beam structure are subjected to the collision force in sequence, and the collision force is gradually relieved. The reinforced structure on the surface and the outer surface can help the rear longitudinal beam reduce the deformation when it is stressed, and the setting of the first avoidance groove and the second avoidance groove can help protect the battery pack and chassis system of the new energy vehicle and avoid damage caused by Collisions cause secondary damage.

Preferably, the first mounting part includes a sealing plate fixedly connected with the first force-receiving part, and an accommodating cavity fixedly connected with the sealing plate. The accommodating cavity can limit the position of the component connected with the first force-receiving part.

Preferably, the second mounting part includes a mounting seat fixedly connected to the third force-receiving part, and a limiting groove formed by the third force-receiving part and the mounting seat. The device connected to the third force-receiving part can be fitted with the rear longitudinal beam body through the mounting seat and the limiting groove, which helps to improve the installation strength and installation accuracy.

Preferably, the reinforcing structure includes a reinforcing member arranged on the inner surface of the rear longitudinal beam body, and reinforcing ribs arranged on the reinforcing member and the outer surface of the rear longitudinal beam body. The arrangement of the reinforcements and ribs helps to maintain the stability of the rear longitudinal beam body structure.

Preferably, the reinforcing ribs include accompanying reinforcing ribs arranged along the rear longitudinal beam body structure, and crossing reinforcing ribs arranged up and down along the accompanying reinforcing ribs, and the thickness of the crossing reinforcing ribs near the edge of the rear longitudinal beam body is greater than that away from the rear longitudinal beam. The thickness of the cross stiffener at the edge of the beam body. The accompanying ribs can concentrate the load and transmit it in a specified direction when a collision occurs, and the cross ribs arranged along the accompanying ribs can increase the rigidity of the rear longitudinal beam body and help to disperse the force on the rear longitudinal beam body , to avoid the thin thickness of the parts with large stress, and the thick thickness of the parts with small stress, so as to further reduce the deformation of the rear longitudinal beam body.

As a preference, the reinforcing member is provided with a mounting plate, and the mounting plate is provided with a first mounting seat for installing the front crossbeam on the rear floor, and a second mounting seat for installing the rear crossbeam on the rear floor, the Both the first mounting base and the second mounting base are cavities, and both sides of the first mounting base and the mounting base are provided with mounting holes. The front beam on the rear floor and the rear beam on the rear floor are respectively installed on the first mounting base and the second mounting base, and then they are fixedly connected with the mounting holes on both sides of the first mounting base and the second mounting base, so that the rear beam on the rear floor The connection between the rear beam and the rear longitudinal beam body on the front beam and the rear floor is more stable, and the cavities inside the first mounting base and the second mounting base provide space for the installation of the circulation screw, avoiding the circulation screw during installation. The body of the rear longitudinal beam is damaged.

Preferably, the first force-receiving part and the sealing plate form a first installation groove for installing the rear floor front beam, and the second installation part and the installation plate form a second installation groove for installing the rear floor rear beam. Both the first mounting groove and the second mounting groove are matched on the basis of existing workpieces, which reduces the number of additional parts and contributes to reducing the weight of the vehicle body.

Preferably, a cross rib is provided between the first extension part, the second extension part and the installation plate. It helps to strengthen the structural strength between the first extension part, the second extension part and the installation board.

A new energy vehicle, comprising a rear anti-collision beam, a rear energy-absorbing box, a rear longitudinal beam reinforcement, a door sill beam, and a left longitudinal beam and a right longitudinal beam connected between the rear longitudinal beam reinforcement and the door sill beam, The right side beam is the rear side beam body structure described in any one of the above items, and the left side beam and the right side beam are arranged symmetrically.

Therefore, the present invention has the following beneficial effects: (1) The rear longitudinal beam structure manufactured by high-pressure casting integrated molding replaces the traditional steel welding technology, with good product consistency, low quality and less manufacturing processes; Design the structure of the rear longitudinal beam according to the actual force of the beam body, including the shape of the rib and the thickness of the rib, so that the force of the entire rear longitudinal beam structure is more uniform and the deformation is reduced; (3) In the existing workpiece The first mounting groove and the second mounting groove are formed under the cooperation of the structure, which reduces the number of additional parts and contributes to reducing the weight of the vehicle body.

Description of drawings

Fig. 1 is a structural schematic diagram of the rear longitudinal beam structure provided by the present invention.

Fig. 2 is another structural schematic diagram of the rear longitudinal beam structure provided by the present invention.

Fig. 3 is a top view of the rear longitudinal beam structure provided by the present invention.

Fig. 4 is a partial structural schematic diagram of the new energy vehicle provided by the present invention.

In the figure: 1, rear longitudinal beam body, 11, first force receiving part, 12, second force receiving part, 121, first avoidance groove, 13, third force receiving part, 131, second avoidance groove, 132, Mounting seat, 133, limit groove, 21, first extension part, 22, second extension part, 31, first installation part, 311, sealing plate, 312, accommodating cavity, 32, second installation part, 41, Reinforcement, 411, mounting plate, 42, reinforcing rib, 421, accompanying reinforcing rib, 422, crossing reinforcing rib, 51, first mounting seat, 52, second mounting seat, 61, first mounting groove, 62, second Mounting slot, 7, rear anti-collision beam, 8, rear crash box, 9, rear longitudinal beam reinforcement, 10, door sill beam.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 to 4, a rear longitudinal beam structure includes a rear longitudinal beam body 1 integrally formed by high-pressure casting, and the rear longitudinal beam body 1 is divided into a first force-receiving part 11, a second force-receiving part 12 and The third force-receiving part 13, the horizontal plane of the second force-receiving part 12 is higher than the horizontal plane of the first force-receiving part 11 and the third force-receiving part 13, forming a first avoidance groove 121 adapted to the chassis system, the first force-receiving part 12 The three force-receiving parts 13 are bent upwards in the vertical direction to form a second avoidance groove 131 adapted to the battery pack. The first force-receiving part 11 extends inward along the vertical plane where the second force-receiving part 12 is located to form a first The extension part 21, the third force-receiving part 13 extends outward along the plane where the second force-receiving part 12 is located to form a second extension part 22, the end of the first force-receiving part 11 is provided with a first mounting part 31, The end of the third force-receiving part 13 is provided with a second mounting part 32, and the inner surface and the outer surface of the rear longitudinal beam body 1 are both provided with reinforcement structures. When the new energy vehicle collides, the first force-receiving part 11, the second force-receiving part 12, and the third force-receiving part 13 of the rear longitudinal beam structure are subjected to the collision force in sequence, and the collision force is gradually relieved, and the rear longitudinal beam structure The reinforcement structure on the inner and outer surfaces of the beam body 1 can help the rear longitudinal beam reduce the deformation when it is stressed, and the setting of the first avoidance groove 111 and the second avoidance groove 121 helps to protect the battery pack of the new energy vehicle and chassis system to avoid secondary injuries caused by collisions.

Specifically, the rear longitudinal beam structure is made of AlSi10MnMg, which has a large elongation after fracture and bending angle, which can ensure that the obtained rear longitudinal beam structure has good recovery, and helps to improve the structure The degree of integration and impact energy absorption performance.

Specifically, the rear longitudinal beam structure undergoes T7 heat treatment, so that its shape and size do not change much under long-term service conditions, which helps to ensure the performance stability of the product.

Specifically, the first installation part 31 includes a sealing plate 311 fixedly connected with the first force-receiving part 11 , and an accommodating cavity 312 fixedly connected with the sealing plate 311 . The accommodating cavity 312 can limit the position of the components connected with the first force-receiving part 11 .

Specifically, the second mounting portion 32 includes a mounting seat 132 fixedly connected with the third force receiving portion 13 , and a limiting groove 133 formed between the third force receiving portion 13 and the mounting seat 132 . The device connected to the third force-receiving part 13 can be fitted with the rear side member body 1 through the mounting seat 132 and the limiting groove 133, which helps to improve the installation strength and installation accuracy.

Specifically, the reinforcement structure includes a reinforcement 41 provided on the inner surface of the rear longitudinal beam body 1 , and a reinforcing rib 42 provided on the reinforcement member 41 and the outer surface of the rear longitudinal beam body 1 . The setting of the reinforcing member 41 and the reinforcing rib 42 helps to maintain the stability of the structure of the rear longitudinal beam body 1 .

Specifically, the reinforcing ribs 42 include accompanying reinforcing ribs 421 arranged along the structure of the rear longitudinal beam body 1 , and crossing reinforcing ribs 422 arranged up and down along the accompanying reinforcing ribs 421 , and the crossing reinforcing ribs near the edge of the rear longitudinal beam body 1 The thickness of the rib 422 is greater than the thickness of the cross rib 422 away from the edge of the rear longitudinal beam body 1 . The accompanying ribs 421 can concentrate the load and transmit it in a designated direction when a collision occurs, and the cross ribs 422 arranged along the accompanying ribs 421 can increase the rigidity of the rear longitudinal beam body 1 and help to disperse the rear longitudinal beam body 1. The acting force received by the rear longitudinal beam body 1 is prevented from having a small thickness at a part subjected to a large force, and a large thickness at a part subjected to a small force, so as to further reduce the deformation of the rear longitudinal beam body 1 .

Specifically, the reinforcing member 41 is provided with a mounting plate 411, and the mounting plate 411 is provided with a first mounting seat 51 for installing the front beam on the rear floor, and a second mounting seat 51 for installing the rear beam on the rear floor. Seat 52, the inside of the first mounting seat 51 and the second mounting seat 52 are both cavities, and both sides of the first mounting seat 51 and the mounting seat 52 are provided with mounting holes. The front crossbeam on the back floor and the rear crossbeam on the back floor are installed on the first mounting seat 51 and the second mounting seat 52 respectively earlier, and then it is fixedly connected with the mounting holes on both sides of the first mounting seat 51 and the second mounting seat 52, Make the connection between the front beam on the rear floor and the rear beam on the rear floor and the rear longitudinal beam body more stable, and the cavities inside the first mounting seat 51 and the second mounting seat 52 provide space for the installation of circulation screws to avoid circulation. The screws cause damage to the rear longitudinal beam body 1 during installation.

Specifically, the first force receiving part 11 and the sealing plate 311 form a first installation groove 61 for installing the rear floor front beam, and the second installation part 12 and the installation plate 411 form a first installation groove 61 for installing the rear floor rear beam. The second installation slot 62 . Both the first mounting groove 61 and the second mounting groove 62 are obtained by matching on the basis of existing workpieces, which reduces the number of additional components and helps reduce the weight of the vehicle body.

Specifically, cross ribs 422 are provided between the first extension portion 21 , the second extension portion 22 , and the installation plate 411 . It helps to strengthen the structural strength between the first extension part 21, the second extension part 22 and the installation board.

A new energy vehicle, comprising a rear anti-collision beam 7, a rear energy-absorbing box 8, a rear longitudinal beam reinforcement 9, a door sill beam 10, and a left longitudinal beam and a The right side beam, the right side beam is the rear side beam body structure as described in any one of the above items, and the left side beam and the right side beam are arranged symmetrically.

Claims (3)

1. A rear longitudinal beam structure, characterized in that it comprises a rear longitudinal beam body integrally formed by high-pressure casting, and the rear longitudinal beam body is divided into a first force-receiving part, a second force-receiving part and a third force-receiving part, The horizontal plane where the second force receiving part is located is higher than the horizontal plane where the first force receiving part and the third force receiving part are located, forming a first avoidance groove adapted to the chassis system, and the third force receiving part is bent upward in the vertical direction, A second avoidance slot for the battery pack is formed, the first force-receiving part extends inward along the vertical plane where the second force-receiving part is located to form a first extension part, and the third force-receiving part extends along the second force-receiving part The plane where the part is located extends outward to form a second extension part, the end of the first force-receiving part is provided with a first installation part, the end of the third force-receiving part is provided with a second installation part, and the rear longitudinal Both the inner surface and the outer surface of the beam body are provided with reinforcement structures; the first force-receiving part and the sealing plate form a first installation groove for installing the rear floor crossbeam, and the second installation part and the installation plate form a The second installation groove of the front cross member of the floor after installation; the first installation part includes a sealing plate fixedly connected with the first force receiving part, and an accommodating cavity fixedly connected with the sealing plate; the second installation part includes a sealing plate fixedly connected with the first force receiving part; The mounting seat for the fixed connection of the three force-bearing parts, and the limiting groove formed by the third force-bearing part and the mounting seat; The reinforcing ribs on the outer surface of the beam body, the reinforcing ribs include accompanying reinforcing ribs arranged along the rear longitudinal beam body structure, and cross reinforcing ribs arranged up and down along the accompanying reinforcing ribs, and the cross reinforcing ribs near the edge of the rear longitudinal beam body The thickness is greater than the thickness of the cross reinforcement away from the edge of the rear longitudinal beam body; the cross reinforcement is arranged between the first extension part, the second extension part and the mounting plate. 2. A rear longitudinal beam structure according to claim 1, wherein a mounting plate is provided on the reinforcing member, and a first mounting seat for mounting the front beam on the rear floor is provided on the mounting plate, And the second mounting seat for installing the rear beam on the rear floor, the inside of the first mounting seat and the second mounting seat are both cavities, and both sides of the first mounting seat and the mounting seat are provided with mounting holes. 3. A new energy vehicle, characterized in that it includes a rear anti-collision beam, a rear energy-absorbing box, a rear longitudinal beam reinforcement, a door sill beam, and a left longitudinal beam connected between the rear longitudinal beam reinforcement and the door sill beam. A beam and a right side beam, the right side beam is the rear side beam body structure according to any one of claims 1-2, and the left side beam and the right side beam are arranged symmetrically.

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