Sprockets made of two materials with half holes on the edge of central portion
AssigneeVpower Racing U.S.A. Inc.
InventorYimin Wang
Life of this patent
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Abstract
The present sprocket wheel invention enhances the efficiency of the sprockets made of two materials, e.g., a lighter material at central portion of the sprocket and a hard material at peripheral portion of the sprocket comprising teeth, by drilling half holes on the outer edge of the central portion and half holes on the inner edge of the peripheral portion of the sprocket. In the preferred embodiment, half of the thickness of the sprocket is the entire hole on the peripheral portion of the sprocket with harder materials, and the other half of the thickness of the sprocket is designed to have said half holes for rivets to attach the central portion and the peripheral portion of the sprocket.
Claims12
A sprocket comprising
- a central portion comprising:
- a central-portion body having a first thickness;
- a central-portion outer edge defined in part by a central-portion rim extending from the central-portion body having a second thickness that is less than the first thickness;
- and,
- a plurality of central-portion half-hole coupling slots defined by the central portion rim and positioned at an outermost edge of the central-portion body and on a peripheral face facing radially and extending the entire thickness of the peripheral face;
- and
- a peripheral portion comprising:
- a peripheral-portion body having a thickness substantially the same as the first thickness;
- a peripheral-portion inner edge defined in part by a peripheral-portion rim extending from the central-portion body having a third thickness that is less than the first thickness;
- and,
- a plurality of peripheral-portion coupling orifices each having a portion defined by both the peripheral-portion body and a portion defined by the peripheral-portion rim, and
- wherein the central portion and peripheral portion are configured to couple, with the peripheral portion being peripheral to the central portion, with the peripheral-portion rim abutting the central-portion rim, and with the plurality of central-portion half-hole coupling slots corresponding to the peripheral-portion coupling orifices and defining a plurality of sprocket coupling holes.
Dependencies are inferred from the claim text.