A detent mechanism 70 is provided for fixing a shift drum 58 in position at a rotation operation position where shift gears 36, 37 become engageable. The detent mechanism 70 includes a positioning rotation portion 71 formed in the shift drum 58, a positioning arm 72 engageable with a positioning action portion 74 formed in the positioning rotation portion 71 for fixing the shift drum 58 at a rotation position corresponding to a rotation operation position of the shift drum 58, and a positioning spring 73 for urging the positioning arm 72 for its engagement with the positioning action portion 74. The positioning arm 72, as being rotatably supported to a speed changing operation shaft 61 for rotating the shift drum 58, is extended from a speed changing operation shaft 61.

This invention provides a continuously variable transmission (CVT) system using variable disk friction drive. The CVT system comprises a variator (17) including a roller (216), having a cam follower (243; 247), which is radially displaceable from a central axis and mounted in friction drive contact with a drive disk (15); and a rotatable spiral cam (181 ) including a spiral cam cavity (301) arranged such that the roller (216) and the cam follower (243; 247) protrudes through the spiral cam cavity (301), the spiral cam (181) being rotatable about a central axis to radially displace the roller (216). The invention includes a three-mode synchronous system adapted to cooperate with the variator (17).

A gear transmission (20) includes a plurality of shift gears (36, 37), a plurality of shifters (55, 56) engaged, respectively, with the plurality of shift gears (36, 37), and a shift drum (58) rotatably operated by a stepped speed changing operational tool (66) to operate the plurality of shifters (55, 56), thus being speed-changed in forward three speed stages. The stepped speed changing operational tool (66) is switched to a neutral position, a forward third speed position, a forward second speed position and a forward first speed position in this cited order.

An electric power generation controller for use in an aircraft is a controller of an electric power generating apparatus including a manual transmission configured to change speed of rotational power of an aircraft engine, transmit the rotational power to an electric power generator, and switch a gear stage by a friction clutch pressed by an actuator. The electric power generation controller includes a manual transmission control section configured to control the manual transmission. The manual transmission control section includes: a shift command section configured to output a shift signal which switches the gear stage of the manual transmission; and a clutch control section configured to, when switching the gear stage of the manual transmission, control clutch pressure of the actuator such that the friction clutch becomes a half-engaged state.

A hybrid power assembly and an all-terrain vehicle are provided. The hybrid power assembly includes an engine and a motor. The engine includes a crankshaft and a crankcase, the crankshaft is mounted in the crankcase, the crankcase includes a motor mounting cap, and a first end of the crankshaft extends out of the motor mounting cap. The motor includes a motor housing, a cap of the motor, a stator, and a rotor. The motor housing is mounted between the motor mounting cap and the cap of the motor, the stator is fixed in the motor housing, the rotor is arranged on the inner circwnference of the stator and is rotatable relative to the stator, and the rotor is connected to the first end of the crankshaft.

A snowmobile has a two-stroke engine having an electronic reverse function so that a crankshaft can be selectively rotated in forward and reverse rotation directions. A gearbox has a first shaft coupled to a countershaft, a second shaft extending parallel to the first shaft, first transmission gears mounted to the first shaft and second transmission gears mounted to the second shaft. The first transmission gears are in constant mesh with the second transmission gears to form high and low gear pairings. A shifter is operable for selectively operating the gearbox in one of a high gear, a low gear and a neutral gear. The engine is selectively operable in the forward and reverse rotation directions while the gearbox is operated in at least one of the high gear, the low gear and the neutral gear.

A gear transmission having a speed changing section includes a speed changing gear for setting a speed stage and a shift gear slidably mounted on a rotation support shaft and operated to engage and disengage with the speed changing gear, the speed changing section configured to speed-change inputted power and to output the resultant power via the rotation support shaft. An arrangement is provided for facilitating engagement of the shift gear with the speed changing gear even when respective end faces of the shift gear and the speed changing gear hit each other. A transmission mechanism (20B) is provided for outputting power of a rotation support shaft (24) to a traveling device. The transmission mechanism (20B) has a transmission flexibility portion (80) which allows free rotation of the rotation support shaft (24) by a set rotation angle.

A gear transmission (20) includes a plurality of shift gears (36, 37), a plurality of shifters (55, 56) engaged, respectively, with the plurality of shift gears (36, 37), and a shift drum (58) rotatably operated by a stepped speed changing operational tool (66) to operate the plurality of shifters (55, 56), thus being speed-changed in forward three speed stages. The stepped speed changing operational tool (66) is switched to a neutral position, a forward third speed position, a forward second speed position and a forward first speed position in this cited order.

A variable drive system, to drive an accessory drive of a machine may include a first variable pulley to be mechanically coupled to the accessory drive and an engine output of an engine. The variable drive system may also include a second variable pulley to be mechanically coupled to a flywheel. The variable drive system may include a drive element to rotate, according to a clutch system, about the first variable pulley and the second variable pulley to at least one of: drive the second variable pulley to charge the flywheel with kinetic energy or drive the first variable pulley via kinetic energy from the flywheel.

A gear transmission having a speed changing section includes a speed changing gear for setting a speed stage and a shift gear slidably mounted on a rotation support shaft and operated to engage and disengage with the speed changing gear, the speed changing section configured to speed-change inputted power and to output the resultant power via the rotation support shaft. An arrangement is provided for facilitating engagement of the shift gear with the speed changing gear even when respective end faces of the shift gear and the speed changing gear hit each other. A transmission mechanism (20B) is provided for outputting power of a rotation support shaft (24) to a traveling device. The transmission mechanism (20B) has a transmission flexibility portion (80) which allows free rotation of the rotation support shaft (24) by a set rotation angle.