Abstract:
A motorcycle including a belt type continuously variable transmission (CVT) and having a reduced width. An engine unit includes an engine having a crank shaft, the belt type CVT, a clutch, an output shaft and a generator. The CVT has a primary sheave, a secondary sheave shaft and a secondary sheave. The primary sheave is on one side of the crank shaft and the clutch is on another side with respect to the secondary sheave on the secondary sheave shaft. The output shaft is on a side opposite to the clutch on the secondary sheave shaft. The generator is on the other side of the crank shaft. A center axis of rotation of the secondary sheave shaft is higher than a center axis of rotation of the crank shaft. Right and left footsteps are located behind a rear end of the rotation motor and under a lower end of the secondary sheave.
Abstract:
A centrifugal clutch for a vehicle includes a clutch housing having friction plates, a clutch boss having clutch plates, a pressure plate, and roller weights that press the pressure plate in a direction such that the friction plates and the clutch plates are brought into frictional contact with each other when the roller weights receive a centrifugal force. The vehicle power unit includes a main shaft which has an oil supply passage formed therein. The clutch includes a first oil supply path that supplies oil via the oil supply passage to the friction and clutch plates. The clutch includes a second oil supply path that supplies oil via the oil supply passage to the roller weights. The first and second oil supply paths are formed individually to allow independent adjustment of oil supply to each path.
Abstract:
A motorcycle is provided with a vehicle body, front and rear wheels, an engine and a power transmission mechanism for connecting the engine to the rear wheel. A centrifugal clutch and a transmission having a plurality of gears are arranged in the power transmission mechanism. A handle is provided on the vehicle body. An accelerator grip is provided on the right side of the handle and a clutch lever is provided on the left side. A shift pedal for changing the transmission gear ratio of the transmission and a side stand are provided on the left side of the vehicle body. A rear brake pedal for braking the rear wheel is provided on the right side of the vehicle body. The motorcycle is also provided with a rotation suppression mechanism for suppressing the rotation of the rear wheel at least when the engine is stopped.
Abstract:
A clutching system comprises a lever mechanism portion and a clutch mechanism portion. The lever mechanism portion comprises a push lever. The push lever comprises a cam surface. The clutch mechanism portion comprises a push rod. The push rod comprises a cam follower. A Belleville spring functions as a clutch spring. The cam surface and the cam follower are formed such that a lever ratio of the push lever at a pivot start position is larger than a lever ratio of the push lever at a pivot finish position. The Belleville spring is formed such that a force required to move the push lever at the pivot finish position is smaller than a force required to move to the push lever at the pivot start position.
Abstract:
A clutch includes an automatic play adjusting mechanism interposed between a pressure plate and a pull rod, to allow movement of the pressure plate relative to the pull rod in a clutch axial direction in a clutch connected state, and to restrict the movement of the pressure plate relative to the pull rod in the clutch axial direction when the pull rod moves more than a prescribed play amount in the clutch axial direction. As a result, the clutch can restrict the shift of a touch point caused by thermal expansion or wear, and the play amount of the clutch can be adjusted automatically.
Abstract:
A cam face 81 and a cam face 181 are formed in such a manner that an angular velocity ω represented by the following equation increases when a parameter R increases and the angular velocity ω decreases when the parameter R decreases, ω2=(1/m)·[F(tan α+tan β)/R], where the mass of the centrifugal weight (41) is m, the revolution radius that is the distance from the rotation center (0) of the centrifugal weight (41) to the center of gravity of the centrifugal weight (41) is R, the angle formed by a radial line (L0) and a tangent line (L1) of a point of the cam face (81) being in contact with the centrifugal weight (41) is α, the angle formed by a radial line (L0) and a tangent line (L2) of a point in the cam face (181) being in contact with the centrifugal weight (41) is β, and the urging force of a Belleville spring that urges a roller retainer (78) is F.
Abstract:
A secondary sheave shaft of a transmission is disposed vertically higher than a drive shaft when viewed along the axial direction of the shafts. An idle shaft of a speed-reduction mechanism is disposed between a primary sheave and an imaginary plane that extends through an axis of rotation of the secondary sheave shaft and an axis of rotation of the drive shaft. The drive shaft is disposed inside a profile of a transmission case when viewed along the axial direction of the secondary sheave shaft and the drive shaft.
Abstract:
A centrifugal clutch for an engine includes a pressure plate that presses a friction plate into a clutch plate is provided. The clutch may include a plurality of roller weights that move on respective cam surfaces in a radially outward direction relative to the pressure plate in accordance with the magnitude of a centrifugal force generated by rotation of a drive side rotating body. The pressure plate presses the friction plate into the clutch plate with a force corresponding to the amount of movement. An elastic member is operatively coupled to the pressure plate to cause the friction and clutch plates to stay in pressed contact even when the engine is in a stopped state.
Abstract:
A clutch drive device includes an actuator for generating a drive force for driving a clutch, a first solid of revolution, a mechanism for transmitting the drive force of the actuator to the clutch, and an assist spring unit having one end pivotally supported and another end abutting on the solid of revolution. An abutment structure in which the first solid of revolution abuts on the assist spring unit is configured so that an urging force of the assist spring does not act in a direction of rotating the first solid of revolution at least at one position in a play area in which the clutch is not disengaged even if the first solid of revolution rotates.
Abstract:
A clutch drive apparatus includes a clutch actuator and a drive force transmission mechanism that transmits the drive force of the clutch actuator to the clutch. The drive force transmission mechanism includes a case body and a case cover that is closed on the case body and supports the clutch actuator and a worm shaft. An opening is formed in the case cover to expose a marker member that determines a reference position of an auxiliary elastic body. A maintenance lid for covering the opening is mounted in a vehicle head pipe.