Rear frame assembly of vehicle body chassis

Abstract

The invention discloses a rear frame assembly of a vehicle body chassis, which comprises a vehicle tail longitudinal beam, a vehicle tail cross beam and a vehicle tail frame assembly of a tail cross beam and a vehicle body rear frame assembly which comprises a vehicle rear longitudinal beam, a first cross beam and a second cross beam, wherein a rear protection plate or a rear anti-collision beam is arranged at the rear part of the vehicle tail cross beam; the vehicle tail longitudinal beam and the rear end part of the vehicle rear longitudinal beam are fixed through a rear connecting longitudinal beam; a third cross beam and a fourth cross beam are transversely arranged between the rear connecting longitudinal beams; a rear floor is fixed on the first cross beam, the second cross beam, thethird cross beam and the fourth cross beam; a rear seat longitudinal beam is arranged between the third beam and the fourth beam and the front and rear end are fixed to the third beam and the fourthbeam; the rear seat of the vehicle is fixed to the third beam, the fourth beam and the rear seat longitudinal beam. The rear frame assembly of the chassis of the vehicle body is simple in structure, the riding comfort and the torsional rigidity and impact resistance of a rear floor area are improved, stress concentration is avoided, the running stability is improved, and the safety performance ofthe vehicle body is improved.

Description

technical field [0001] The invention relates to a frame structure of an automobile, in particular to a chassis rear frame assembly of a vehicle body. Background technique [0002] The body structure is composed of outer covering parts, beams, pillars and structural reinforcements, and is the basic system for bearing loads such as road chassis collisions and transmitting loads. The body structure design plays a decisive role in the safety of the body, durability strength, bending and torsional stiffness, and modal performance of the body in white. The body structure design not only affects the performance of the body, but also affects the weight and cost of the body. [0003] Medium-sized SUV models are generally 5-seater or 7-seater cars with a wheelbase of more than 2700mm. Traditional SUVs are front-engine front-drive. When the wheelbase reaches 2800mm, there is likely to be a large difference in the front and rear weights of the vehicle, and the front is heavy and the re...

AI Technical Summary

Problems solved by technology

In this way, there are fewer connections and supports between the beams of the traditional frame structure. When the whole vehicle is twisted, the force transmission only depends on the connection of the longitudinal beams, and the mutual transmission between the beams and the two large longitudinal beams. The force between the beams The transmission needs to be transferred through the large longitudinal beam. During the measurement and driving process, especially in the case of turning, the force on the overall large longitudinal beam and the cross beam is relatively large, and the direction of the force is different, and the driving stability is obvious. It is affected, especially in the torsion condition, the deformation of the longitudinal beam and the cross beam is large, which seriously affects the driving stability of the vehicle. This situation is especially obvious on the models with independent suspension at the rear

Moreover, because the force transmission is not timely and the direction is single, the strength and rigidity of the chassis frame of the entire body-in-white are not high, and each component is greatly affected

Moreover, because the beam of the traditional frame structure only extends to the side of the longitudinal beam for connection, the end of the beam is welded to the longitudinal beam at the side of the beam, and the strength of the joint between the beam and the longitudinal beam is not high.

In the case of collision and large-angle torsion, the connection between the beam and the longitudinal beam is not firm, and the strength and rigidity are not enough

In addition, the sub-frame mounting tray of the traditional structure is directly installed on the longitudinal beam, and it is not connected to the cross beam. Although in some cases the sub-frame mounting tray is connected to the longitudinal beam through the tray reinforcement plate, it is also easy to cause the sub-frame The mounting point of the frame mounting tray is not rigid enough, which not only affects the driving stability, but also easily causes fatigue and cracking of the mounting point

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