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US 9,067,639 B2Granted
Bottom bracket assembly of a bicycle and left crank arm assembly thereof
AssigneeCampagnolo S.r.l.
InventorsGiuseppe Dal Prà, Nicola Sgreva
Life of this patent
Estimating the term…
Abstract
A bicycle bottom bracket assembly that reduces the accumulation of dirt and/or corrosive substances inside the shaft extending between the crank arms of the assembly. The bottom bracket assembly includes a shaft having a through-cavity that extends along its longitudinal direction; a crank arm is associated with each end portion of the shaft, and the through-cavity extends unobstructed through the crank arms and the shaft.
Claims19
A bicycle bottom bracket assembly comprising:
- a shaft having an longitudinal axis (X-X) extending continuously between the shaft's end portions;
- a left crank arm
- a right crank arm;
- a first end portion of the shaft includes at an axially outermost portion thereof an external threading and a grooved outer surface that is located axially inward from said external threading and couples with complementary grooves in said left crank arm;
- and,
- a through-cavity that extends along said continuous longitudinal axis with a varying inner surface diameter between the shaft's end portions that includes radiused surfaces.
3 more elements
A bicycle bottom bracket assembly comprising:
- a shaft having an longitudinal axis (X-X) extending between the shaft's end portions;
- a left crank arm associated with a first end portion of said shaft;
- a right crank arm associated with a second end portion of said shaft;
- a through-cavity that extends unobstructed along said longitudinal axis through the crank arms and said shaft;
- a pair of bearings that support said shaft in rotation with respect to a housing box of the bottom bracket assembly provided in a bicycle frame;
- an adjuster for adjusting an axial position of at least one of said left crank arm and said right crank arm with respect to said pair of bearings, wherein said adjuster is axially arranged between said at least one of said left crank arm and said right crank arm and a respective bearing of said pair of bearings;
- a first service ring nut in axial abutment with said respective bearing of said pair of bearings;
- a second service ring nut coupled with said first service ring nut and in axial abutment with said at least one of said left crank arm and said right crank arm;
- and
- a position lock for fixing the axial position of said second service ring nut with respect to said first service ring nut.
7 more elements
Bottom bracket assembly of a bicycle, comprising:
- a shaft having an axis (X-X) extending along a longitudinal direction between the shaft's end portions;
- a pair of crank arms, each one associated with a respective end portion of said shaft;
- a first end portion of the shaft includes at an axially outermost portion thereof an external threading and a grooved outer surface that is located axially inward from the external threading and couples with complementary grooves in at least one crank arm of said pair of crank arms;
- a pair of bearings that support said shaft in rotation with respect to a housing box of the bottom bracket assembly provided in a bicycle frame;
- an adjuster for adjusting an axial position of said at least one crank arm of said pair of crank arms with respect to said pair of bearings, wherein said adjuster is axially arranged between said at least one crank arm of said pair of crank arms and a respective bearing of said pair of bearings,
- wherein said adjuster comprises:
- a first service ring nut in axial abutment with said respective bearing;
- a second service ring nut coupled with said first service ring nut and in axial abutment with said at least one crank arm of said pair of crank arms;
- and
- a position lock for fixing an axial position of said second service ring nut with respect to said first service ring nut.
7 more elements
Dependencies are inferred from the claim text.