Power transmission chain pin and manufacture method thereof
AssigneeJtekt Corporation
InventorYoshihisa Miura
Life of this patent
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Abstract
A manufacture method of a power transmission chain pin includes a work step of working a bar-like member of a predetermined length into a pin having a final sectional shape and a final end portion shape with a guide portion to facilitate a press-fitting operation by a cold forging work. At this time, the manufacture method does not include a grinding step of grinding an end portion of the bar-like member of the predetermined length by a grinding stone.
Claims4
A power transmission chain pin which is press-fitted to links arranged in a chain width direction of a power transmission chain, the power transmission chain pin comprising:
- a guide portion disposed in at least one end portion of the power transmission chain pin and inclined so as to gradually increase a press-fitting margin to facilitate a press-fitting operation,
- wherein the guide portion is formed by a cold forging work.
A method of manufacturing a power transmission chain pin which connects links arranged in a chain width direction of a power transmission chain, the method comprising:
- a rough sectional shape formation step of drawing a wire rod so that a section thereof is formed in a substantially oval shape;
- and
- a rough end portion shape formation step of cutting a continuous bar-like member which has been subjected to the drawing work into a predetermined length so that an end surface thereof has a predetermined angle with respect to an axial direction;
- wherein a final sectional shape and a final end portion shape of the power transmission chain pin are formed by a cold forging work to the bar-like member cut into the predetermined length, which is a final shape formation step.
Dependencies are inferred from the claim text.