Automobile rear girder assembly and automobile rear lower automobile body structure

Abstract

The invention provides an automobile rear girder assembly and an automobile rear lower automobile body structure and belongs to the field of automobile part structures. The automobile rear girder assembly comprises a rear girder and a rear girder inner plate which are fixedly connected, the rear girder and the rear girder inner plate form a hollow cavity, the rear girder comprises a rear girder front in lap joint with a third automobile cross beam and a rear girder rear in lap joint with a rear floor, and the height between the girder rear and the ground is larger than the height between the rear girder front and the ground. The automobile rear girder assembly and the automobile rear lower automobile body structure have the advantages that the rear girder rear is lifted up, a space is spared to arrange an oil tank oil injection pipe and an exhaust pipe barrel, the space is utilized maximumly while the strength, rigidity and fuel system safety requirements in case of riding automobile rear collision are met, the rear girder inner plate is added above the rear girder, the rear girder inner plate and the rear girder form the large sealed cavity, the bearing capacity of the whole automobile is improved, and a larger acting force can be borne when the automobile is subjected to collision.

Description

technical field [0001] The invention relates to an automobile part structure, in particular to an automobile rear frame assembly, and also relates to an automobile rear lower body structure including the automobile rear frame assembly. Background technique [0002] At present, on the rear lower body of many passenger cars, a frame structure is formed by arranging girders on both sides and several beams between the girders, and then a floor is covered on the frame, so that the girders, beams and floor The parts are welded together by the welding process, forming a closed cavity circuit structure in the entire rear lower body, so that the rear lower body can have a good bearing capacity. While satisfying the arrangement of rear suspension, fuel tank assembly, exhaust pipe assembly, seat installation and other parts, the rear lower body finally realizes that the body meets the requirements of structural strength, rigidity and relevant regulations. [0003] This structure is wi...

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Problems solved by technology

[0004] However, this type also has the disadvantages of relatively high vehicle body, low utilization rate of vehicle space, and increased vehicle counterweight. In addition, there are also the following problems:

[0005] (1) The distance between the exhaust pipe cylinder and the rear frame is too close, the distance to the floor is too small, and the oil injection pipe is arranged too low, which affects oil injection;

[0006] (2) The cross-section of the rear beam is small, such as directly overlapping with the floor, the cavity is small, the bearing capacity is small, and the strength is insufficient;

[0007] (3) There is high stress at the lap joint between the inner panel of the rear frame and the side wall, and the torsional rigidity is low;

[0008] (4) Since the spare tire is placed inside the car body and is a full-size spare tire, the depth of the spare tire pit is 208MM, which makes stamping and forming difficult;

[0010] (6) With reference to other models, the rear floor extension was folded up and welded to the side wall, but the side wall and the rear floor extension formed a closed cavity, which caused the welding gun to be unable to weld, and was limited by the arrangement of the pressure relief valve. lift up;

[0011] (7) The parts of the rear floor extension are large. After the entire rear lower body assembly is welded, it is easy to deform during transportation and under the action of external force, and the matching with the side wall is poor.

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