Standard motor train unit power bogie frame

Abstract

Disclosed is a standard motor train unit power bogie frame. The standard motor train unit power bogie frame is characterized in that side beams and a beam are connected in splicing and variable section mode, an upper cover plate of each side beam extends inwards, and achieves variable section butting against an upper cover plate of the beam through a connection block, the connection block is of a space curved face structure, a lower cover plate of each side beam extends inwards, and butts against a lower cover plate of the beam, and an outer stand plate and an inner stand plate of the beam respectively extend outward, and are inserted into the side beams and directly connected with inner stand plates of the side beams. Section variation of the standard motor train unit power bogie frame can not cause stress concentration and achieves comparable stress level. The connection block is of the space curved face structure, and achieves smooth transition from the upper cover plates of the side beams to the upper cover plate of the beam on geometrical characteristics, and therefore smooth transmission of stress between the upper cover plates of the side beams and the upper cover plate of the beam is achieved. Continuous transition of a box-like structure can be achieved, and rigidity value of the major structure of the standard motor train unit power bogie frame is at the mean value level, and then a rigidity increase on a connection area and stress concentration caused by the rigidity increase are avoided.

Description

technical field [0001] The invention relates to a frame, in particular to an improved low-stress power bogie frame of an EMU. Background technique [0002] One type of the existing high-speed EMU power bogie frame is that the crossbeam is a round steel pipe structure, which needs to be connected to the side beams on both sides through a transition structure, and other functional parts are welded to the round steel pipe crossbeam and the two side beams respectively. The beam structure of this frame is relatively simple, and its bearing capacity is relatively high. But there is the following problem at the junction of the beam and the two side beams: [0003] (1) There is a geometric mutation in the cross-section of the connection, the overall stress of the frame cannot be uniformly transmitted, and there will be stress concentration, which belongs to the weak area of ​​the frame's bearing capacity; [0004] (2) In order to meet the strength requirements of this connection a...

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Problems solved by technology

[0005] (3) The large-mass driving device on the frame is directly installed on the beam, and its frequent working conditions lead to very severe stress conditions in the connection area, which leads to the weak point of fatigue resistance in the connection area during the service period of the frame

[0007] (1) The multi-pass connection welds on each side are located in similar areas, resulting in a seriously low strength level in this area, so this connection area belongs to the weak area of ​​the frame; therefore, the quality l

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