Power transmission chain pin and manufacture method thereof
AssigneeJtekt Corporation
InventorYoshihisa Miura
Life of this patent
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Abstract
A method of manufacturing a power transmission chain pin, which connects links arranged in a chain width direction of a power transmission chain, includes 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. 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.
Claims6
A method comprising:
- drawing a wire rod so as to form a rough sectional shape such that a section thereof is formed in a substantially oval shape;
- cutting the wire rod into a predetermined length so that an end surface thereof has a predetermined angle with respect to an axial direction of the wire rod;
- and
- cold forging the cut wire rod so as to form a power transmission chain pin having a final sectional shape and a final end portion shape, such that the power transmission chain pin includes a guide portion at least one end portion of the power transmission chain pin in a longitudinal direction thereof, such that a press-fitting margin of the power transmission chain pin gradually increases from the at least one end portion along the longitudinal direction of the power transmission chain pin,
- wherein the guide portion includes a first inclined surface having a first angle with respect to the axial direction and a second inclined surface having a second angle with respect to the axial direction, and the first angle and the second angle are different from each other.
Dependencies are inferred from the claim text.