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US 4,491,031 AGranted
Shift drum type speed change mechanism for motorcycles
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorYuzo Ooka
Life of this patent
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Abstract
A change speed gear mechanism for a motorcycle is controlled by a shift drum mounted to turn. First and second cam plates are coaxially fixed to the shift drum and means are provided for turning the cam plates for moving the shift drum in either direction in equal angular increments between a high speed position and a low speed position, each angular increment being larger than the angular value calculated by dividing 360.degree. by the total number of gear ratios provided by the speed change gear mechanism.
Claims6
A speed change mechanism for a transmission of a motorcycle, comprising
- a shift drum;
- a first cam plate fixed to said drum and having a first cam surface having a series of stopper grooves in said first cam surface with each succeeding groove in said series being spaced equiangularly from the proceding groove in said series;
- a first stopper engaging said first cam surface;
- a second cam plate fixed to said drum and having a second cam surface with at least one stopper groove in said second cam surface;
- a second stopper engaging said second cam surface, said second stopper engaging said stopper groove in said second cam surface with said first stopper being spaced from the last stopper groove in said series by an amount equal to the equiangular spacing between stopper grooves.
2 more elements
Dependencies are inferred from the claim text.