Wheel rim and wheel rim manufacturing method
AssigneeWork Co., Ltd.
InventorTakeshi Tanaka
Life of this patent
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Abstract
It is an object of the present invention to provide a wheel rim equipped with rim flanges that show no deformation or damage even though a reduction in weight is achieved. The wheel is equipped with rim flanges 3 consisting of a double structure in which the end portions across the rim part 2 of width of the rim are folded back to the inside and caused to contact the non-folded portions 3B in a state in which there is no gap. The abovementioned folded portions 3A and non-folded portions 3B have respective thicknesses that are greater than the thickness D1 of the rim part, and curved parts 3C that are smoothly continuous with the surfaces of the non-folded portions 3B are provided on the free end portions of the folded portions 3A.
Claims3
A wheel rim which is equipped with a rim flange consisting of a double structure in which at least the outer-side end portion of the opposite ends across the rim part is folded back toward the inside which is the tire attachment side, and caused to contact the non-folded portion of the rim part without any gap, and wherein said folded portion and said non-folded portion respectively have thicknesses that are greater than the thickness of said rim part, and a curved part which is smoothly continuous with the surface of said non-folded portion is provided on the free end portion of said folded portion.
A wheel rim manufacturing method comprising:
- curling means for curling at least the outer side end portion of the opposite ends across the rim toward the inside which is the tire attachment side in a curvilinear manner;
- and
- roll-forming means for forming the free end portion of said folded portion so that this free end portion is smoothly continuous with the surface of said non-folded portion, while simultaneously producing a double structure in which the curled portion that has been curled by said curling means is folded back and laid on the non-curled portion without any gap by pressing same against the non-curled portion, and for performing finish forming so that the thickness of said folded portion that is folded back and the thickness of the non-folded portion that is caused to contact said folded portion in a state in which there is no gap therebetween are specified thicknesses that are greater than the thickness of said rim part.
Dependencies are inferred from the claim text.