Bicycle frame tube with convex rib inside

Abstract

The invention relates to a bicycle frame tube with flange ribs, which comprises a hollow tube. The invention is characterized in that the bicycle frame tube with flange ribs also comprises at least one flange rib which is extended from the inner wall of the hollow tube to the center of the hollow tube and one end of which is connected with the inner wall of the hollow tube. The bicycle frame tube with flange ribs is used for manufacturing head tubes, seat posts, upper tubes, lower tubes, lower fork tubes, front fork tubes, seat pillars and the like of bicycles. The positions and lengths of various flange ribs are arranged according to the stress conditions and stress directions of positions on the bicycle frame after stress analysis, thereby effectively improving the rigidity or the weight ratio, simplifying the manufacturing process and reducing manufacturing cost.

Description

technical field [0001] The invention relates to a bicycle frame tube, in particular to a bicycle frame tube with convex ribs inside. Background technique [0002] For a bicycle body structure in operation, the stress borne by the connecting portion of the two car pipes is higher than that of other parts of the car body. Therefore, if figure 1 As shown, the connection portion 12 of the general two-car pipe 1 needs to be reinforced structurally, and the method of structural reinforcement is usually to weld the reinforcement sheet 3 on the outer wall of the connection portion 12, so that the connection portion 12 is not easy to Deformation or fracture due to stress. [0003] Since the reinforcing sheet 3 must be manufactured separately, the manufacturing cost will be increased, and the reinforcing sheet 3 is welded to the connecting portion 12 of the vehicle body. This kind of reinforcing method not only requires an additional procedure in the manufacture of the vehicle body ...

AI Technical Summary

Problems solved by technology

[0003] Since the reinforcing sheet 3 must be manufactured separately, the manufacturing cost will be increased, and the reinforcing sheet 3 is welded to the connecting portion 12 of the vehicle body. This kind of reinforcing method not only requires an additional procedure in the manufacture of the vehicle body , its construction quality will also affect the final reinforcement quality, not an absolute improvement; moreover, current bicycle designs are all focused on light weight and high strength (improve the rigidity / weight ratio of the car body), and a complete The bicycle body usually has many connecting parts 12 that need to be reinforced. If the reinforcing sheet 3 is installed on each connecting part 12, the overall weight will inevitably increase, so that the overall rigidity / weight ratio cannot be significantly improved. promote

[0004] In addition, if figure 2 As shown, the industry has also developed another general bicycle tube 7, which has a rib 70 that traverses the section of the tube 7, thereby increasing the strength (rigidity / weight ratio) of the tube 7, Although this method can achieve a more effective increase in the rigidity / weight ratio than the aforementioned method of adding the reinforcing sheet 3, the increase is not quite significant, and there is still room for improvement

[0005] like image 3 , 4 As shown, a car tube 8 with three equiangularly arranged non-transverse ribs 80, but it should be noted that the car tube 8 with non-transverse ribs 80 is only a semi-finished product, and the semi-finished product needs to be After a process of machine converging, the tapered portions 82 of the ribs 80 are tightly pressed against each other so that the gap at the center of the vehicle tube 8 disappears, and the finished product of the vehicle tube 8 is as follows: Figure 4 As shown, it still belongs to the same type as the above-mentioned car tube 7 with transverse ribs 70, and also has the problem that the rigidity / weight ratio cannot be effectively raised upwards. Moreover, the above-mentioned manufacturing method needs an additional machine-converging processing procedure, increase in manufacturing costs

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