Tubeless unequal-thickness and variable-section rim for automobile wheel

Abstract

The invention relates to a tubeless unequal-thickness and variable-section rim for an automobile wheel, which is characterized in that (1) the thickness of the structure of the shape of the section of the rim can be changed randomly at different parts according to the design and practical use requirements and differences of stress, and the material of certain parts with less stress is thinned, thus reducing the weight of the rim, further reducing the weight of a whole automobile and saving oil consumption; the thickness of the raw material of certain parts with larger stress is ensured to be constant, thus ensuring the strength of the parts, further not only reducing the weight, but also ensuring the strength of the wheel; (2) the technique is simple: as the forming procedure of the rim adopts one-time spinning, and the technique is simplified and equipment investment is saved compared with the original mode with three-time roll forming; (3) the raw materials are saved and the material utilization ratio is improved: the spinning is utilized to make a tyre bead to be at 15-degree position, the materials saved at the thinned parts of matched parts of spokes and the like are added to the width direction of the whole rim, thus being capable of saving the width by about 5-8% compared with the original discharging width.

Description

technical field [0001] The invention relates to the cross-sectional structure and manufacturing process of the rim of an automobile tubeless wheel. Background technique [0002] The rim manufacturing process of traditional automobile tubeless wheels is: blanking of flat plate→rolling→welding→flaring→primary rolling→secondary rolling→three-time rolling→expansion and sizing. This kind of process has the following disadvantages: 1. In the rolling manufacturing process, due to the stretched flow of the material, at the turning, especially in some parts with small R size (such as bead seat R, groove bottom R ) will appear thicker than the normal material thickness - that is, the so-called roll thinning. This thinning is generally between 12-15%. Due to the existence of thinning, the strength of the thinned part of the rim is low during use, and it is easy to be damaged or deformed. The tire and the rim are not well sealed, and air leakage occurs; 2. Since this process is made o...

AI Technical Summary

Problems solved by technology

Due to the existence of thinning, the strength of the thinned part of the rim is low during use, and it is easy to be damaged or deformed. The tire and the rim are not well sealed, and air leakage occurs; 2. Since this process is made of equal-thickness plates, It is not possible to thin or thicken the material according to the stress state of the rim during actual use, and the material thickness of some parts with small stress (such as the place where the bead is made at 15° and the place where it fits with the spokes) should not be thin, and the stress is large. The thickness of the parts (such as the bottom of the groove, the flanges at both ends, the bead seat R, and the bottom R of the groove) should be thicker (or ensure that the thickness of the raw material will not be reduced)

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