US 2003/0125146 A1Published application

Silent chain transmission device

AssigneeTsubakimoto Chain Co.

InventorToyonaga Saitoh

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Abstract

In a transmission having a silent chain meshing with a sprocket, each link plate of the chain includes inside engaging surfaces and outside engaging surfaces having the same shape as that of a tooth profile of a hob cutter for shaping the sprocket teeth. The sprocket, which engages the outside engaging surfaces of the link plates when the chain is seated on the sprocket teeth, includes tooth head portions shaped to avoid contact interference with inwardly curved portions of the link plates. The silent chain transmission device controls the engagement time of the inside engaging surface, and thereby decrease vibration noise and impact noise, and prevents stress concentration and wear loss on the inside engaging surface, the inwardly curved inside portion of the link plate, and the tooth head portion of the sprocket, thereby improving durability making assembly easier, and improving production accuracy.

Claims7

Dependent claims

A silent chain transmission device comprising a sprocket having sprocket teeth, and an elongated chain in mesh with said sprocket, said chain comprising links disposed in succession in the longitudinal direction of the chain, each link being composed of a plurality of link plates, and the link plates of each successive pair of links being interleaved with each other and articulably connected by a connecting pin, each said link having a pair of link teeth with inside engaging surfaces facing each other, and outside engaging surfaces facing away from each other, the inside engaging surfaces beginning engagement with the sprocket by contact between the sprocket teeth and the inside engaging surfaces of the link teeth, and seating on the sprocket by contact between the sprocket teeth and the outside engaging surfaces of the link teeth,

wherein the inside and outside engaging surfaces of the link plates have the same profile as the profile of the teeth of a hob cutter for shaping the teeth of said sprocket, the inside engaging surfaces of each link plate diverging from each other and being contiguous with an inward curved portion of the link plate, and said sprocket having tooth heads which avoid contact interference with said inward curved portions of the link plates.

Dependencies are inferred from the claim text.