Cycle frame structure of pedal motorcycle

Abstract

The invention discloses a frame structure for a pedal motorcycle, which comprises a frame main girder, a lower right pipe and a lower left pipe which are symmetrically arranged, and a right pipe and a left pipe which are symmetrically arranged, wherein front ends of the right pipe and the left pipe are connected through a stamping part with a U-shaped cross section; the opening of the stamping part with the U-shaped cross section is downwards; the stamping part with the U-shaped cross section coats the right pipe and the left pipe into the stamping part and connects the right pipe and the left pipe into a whole; and a left reinforcement tube and a right reinforcement tube for connecting the left and the right are welded between the front end of the right pipe and the U-shaped bottom of the lower right pipe, and between the front end of the left pipe and the U-shaped bottom of the lower left pipe respectively. The frame structure for the pedal motorcycle reduces the difficulty and the cost of the manufacturing technology of a vehicle frame, has better strength, is more convenient to assemble, provides a larger space for assembling an engine, can meet the space demand for assemblingthe engine without performing secondary processing on the vehicle frame, and particularly further reinforces the rigidity and the strength of the frame by making the lower left pipe and the lower right pipe form a quadrangular frame structure through arrangement of the left reinforcement tube and the right reinforcement tube.

Description

technical field [0001] The invention relates to a motorcycle frame structure, in particular to a scooter frame structure with simple manufacturing process and good frame rigidity. Background technique [0002] The motorcycle frame is the basic component of the motorcycle. All the parts must be installed on the frame to keep the parts in a relatively stable position. Impact load. Therefore, the motorcycle frame requires sufficient strength and rigidity, and at the same time strives for a small mass to reduce the weight of the vehicle. There are various types and structures of existing motorcycle frames. According to the materials produced, they can be divided into two types: steel pipe type and steel plate type. Made of steel pipe. The cradle frame is a kind of steel pipe frame. Its structure is relatively complicated, but its strength and rigidity are good, and it is suitable for motorcycles with high power. [0003] In the prior art, the cradle type motorcycle frame (re...

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Problems solved by technology

[0003] In the prior art, the cradle type motorcycle frame (referring to Figure 5 ), mainly including the frame main beam 9, the right lower tube 10, the left lower tube 11, the lower beam 12, the right tube 20 and the left tube 21, etc.; wherein, the structures of the right tube 20 and the left tube 21 mainly include two types, one One is bent from a complete steel pipe. The left and right side pipes are collectively called the rear pipe; the middle and rear sections of the rear pipe are connected horizontally by steel pipes, and the front end of the rear pipe is bent into a U shape. This kind of rear pipe is due to the U-shaped curvature. Larger, difficult to control, more difficult to process, and more complicated forming process; moreover, the steel pipe at the bending position after the front end of the steel pipe is bent will have deformation defects such as wrinkling

At the same time, if the bending part of the front end of the rear pipe needs to be flattened and formed, the forming is not only difficult, but also may have forming defects, which will affect the service life of the steel pipe

In another kind, the right pipe 20 and the left pipe 21 are two independent pieces, which are connected horizontally by the front steel pipe 461. This method of steel pipe structure connection has the following disadvantages: first, the connection between the steel pipes has a small connection surface , which affects the stability and rigidity of the frame; second, because the frame needs to leave room for movement of the engine cylinder head and other parts after the engine is installed, it is necessary to open the upper part of the engine cylinder head and other parts on the frame. flat (that is, the lower part of the front steel pipe 461), which not only increases the processing procedure, but also reduces the aesthetic feeling and quality of the appearance

[0004] In addition, the stress-bearing parts of the right lower tube 10 and the left lower tube 11 of the existing motorcycle frame, that is, the right lower tube 10 and the left lower tube 11 at the bottom of the right tube 20 and the left tube 21, also need to be welded and stamped. Its strength, but this kind of strength-enhancing structure has the following disadvantages. First, it uses stamped welded parts, and the production cost is relatively high; second, the stamped welded parts have little effect on the rigidity of the frame.

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