Patent ID: 8376079
Filing Date: 2013-02-19
Classification: B62K,B62M

Abstract:
1. A motorcycle in which a rear fork is swingably provided on a vehicle body frame with a power unit, a rear wheel is provided at a rear end of the rear fork, a drive shaft is provided between a gear case provided on a lateral side of the rear wheel and an output shaft of the power unit, and output power of the power unit is transmitted to the rear wheel through the drive shaft and the gear case, wherein the rear fork extends along a lateral side of the rear wheel and has an arm through which the drive shaft is passed and the arm has a tubular base part with a closed cross section and a rear part with a U-shaped, open cross section which opens in a width direction, and the base part has a thick-walled area at a rear end thereof, the thick-walled area being provided at upper and lower corners of an inner side of the rear end of the base part, so that an area of stress concentration can be strong and a weight of the rear fork can be reduced, wherein the drive shaft passes through the U-shaped, open cross section of the rear part, and the gear case is located between the rear wheel and the rear part of the rear fork in a manner such that a front portion of the gear case extends into the U-shaped, open cross section of the rear part.