초록 ▼

A sprocket 1 includes a wavy region 2. The wavy region is formed at least at the outer periphery of the sprocket and extends in an undulating fashion along the circumference of the sprocket. The wavy region has a plurality of convex joint portions 3. A plurality of teeth 5 are formed at the outer en

A sprocket 1 includes a wavy region 2. The wavy region is formed at least at the outer periphery of the sprocket and extends in an undulating fashion along the circumference of the sprocket. The wavy region has a plurality of convex joint portions 3. A plurality of teeth 5 are formed at the outer end of the convex joint portions.

대표청구항 ▼

[What is claimed is:] [1.]a plurality of convex joint portions;a plurality of slant portions, each of said slant portions being located between separate pairs of adjacent convex joint portions so as to form a wavy region at a periphery of the sprocket, said wavy region extending around a circumferen

[What is claimed is:] [1.]a plurality of convex joint portions;a plurality of slant portions, each of said slant portions being located between separate pairs of adjacent convex joint portions so as to form a wavy region at a periphery of the sprocket, said wavy region extending around a circumference of the sprocket in an undulating shape;a plurality of teeth located at an outer end of said convex joint portions and a tooth located at an outer end of said slant portions; andan annular resilient element for reducing noise arising from contact between said sprocket and a chain, said annular resilient element extending along said plurality of teeth such that a portion of said annular resilient element is positioned in roots formed between adjacent teeth;wherein said plurality of convex joint portions includes a group of pairs of adjacent convex joint portions having a first pitch and includes at least one pair of convex joint portions having a second pitch, said first pitch being different than said second pitch.