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US 6,203,462 B1Granted
Sprocket
AssigneesSunstar Giken Kabushiki Kaisha, Uni-Sunstar B.V.
InventorNorihiko Takamori
Life of this patent
Estimating the term…
Abstract
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.
Claims29
A sprocket comprising:
- 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;
- and
- an 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.
3 more elements
A sprocket comprising:
- 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, wherein roots are formed between adjacent teeth, and through-holes are formed at said roots;
- and
- a plurality of cushion elements for reducing noise arising from contact between said sprocket and a chain, said cushion elements extending through said through-holes and being arranged around said roots;
- 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.
3 more elements
A sprocket comprising:
- a plurality of convex joint portions;
- a plurality of slant portions, each of said slant portions being located between 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;
- and
- a plurality of teeth, one of said teeth being formed at an outer end of each of said convex joint portions;
- 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 adjacent convex joint portions having a second pitch, said first pitch being different than said second pitch;
- and
- wherein at least one of said teeth is located between said at least one pair of convex joint portions having said second pitch.
4 more elements
Dependencies are inferred from the claim text.