A flyweight comprises a body. The body of the flyweight comprises a pivot, a cam surface, and a first coupler. The first coupler is configured to selectively couple at least one first weight to the body distal from the cam surface. A flyweight comprises a body having at least 20% of its mass positioned to contribute negative torque about a pivot related to an acceleration of a CVT clutch from an idling condition. A method of tuning a flyweight comprises attaching at least one first weight to a first coupler of a body of the flyweight distal from a cam surface of the body. A CVT clutch comprises at least one flyweight with a first coupler configured to selectively couple at least one first weight to a body of the flyweight distal from a cam surface.

A drive pulley for a continuously variable transmission (CVT) has a pulley shaft with a fixed sheave, a movable sheave and a back plate thereon. The movable sheave has a movable sheave surface with first and second surface portions that faces the back plate. A biasing member biases the sheaves away from each other. A slider is disposed between the back plate and the movable sheave. The slider has a flat engagement zone surface, and a curved driving zone surface extending outward from the engagement zone surface. From rest, as the pulley shaft accelerates, the engagement zone surface of the slider slides radially outward against the first portion of the movable sheave surface and then the driving zone surface of the slider slides radially outward against the second portion of the movable sheave thereby pushing the movable sheave toward the fixed sheave. A vehicle having the CVT is also disclosed.

A clutch weight for a continuously variable transmission is disclosed. The clutch weight, in certain examples, includes a body having a first end having a pivot pin opening and a second end opposite the first end, a curvilinear surface disposed between the first end and the second end configured to engage a roller, and wherein the roller contacts the curvilinear surface at least at a first contact position, and a center of mass of the body disposed a distance Y from a center of the pivot pin opening and a distance X from the first contact position, and where a ratio of X to Y is in the range of between about 0.526 and 0.558.

A continuously variable transmission device (1) for a two-wheel, three-wheel or four-wheel motorcycle includes a cam system (20, 22; 32a, 32b) operating between a fixed bushing (11) and a mobile bushing (9). The device is configured to obstruct the approach between the active surfaces (8a, 10a) or to facilitate the approach of the active surfaces.

A clutch weight for a continuously variable transmission is disclosed. The clutch weight, in certain examples, includes a body having a first end having a pivot pin opening and a second end opposite the first end, a curvilinear surface disposed between the first end and the second end configured to engage a roller, and wherein the roller contacts the curvilinear surface at least at a first contact position, and a center of mass of the body disposed a distance Y from a center of the pivot pin opening and a distance X from the first contact position, and where a ratio of X to Y is in the range of between about 0.499 and 0.685.

A drive clutch having an engine braking feature for a continuously variable transmission is provided. The drive clutch includes a post that is coupled to an output of an engine. A fixed sheave, coupled to the post, has a fixed sheave belt engagement face. A movable sheave assembly that includes a movable sheave belt engaging face, is configured to move axially on the post to move the movable sheave belt engaging face in relation to the fixed sheave belt engaging face depending on a rotational speed of the drive clutch. An idler bearing is mounted on the post at least in part between the movable sheave belt engaging face and the fixed sheave belt engaging face. The idler bearing includes a one-way rotational assembly and has an outer belt engaging surface with outward extending cogs configured to engage teeth of a belt to prevent slippage during engine braking.

A flyweight comprises a body. The body of the flyweight comprises a pivot, a cam surface, and a first coupler. The first coupler is configured to selectively couple at least one first weight to the body distal from the cam surface. A flyweight comprises a body having at least 20% of its mass positioned to contribute negative torque about a pivot related to an acceleration of a CVT clutch from an idling condition. A method of tuning a flyweight comprises attaching at least one first weight to a first coupler of a body of the flyweight distal from a cam surface of the body. A CVT clutch comprises at least one flyweight with a first coupler configured to selectively couple at least one first weight to a body of the flyweight distal from a cam surface.

A continuously variable transmission driven pulley movable sheave comprising a beveled face disk, an elongated hollow cylindrical collar extending orthogonally from a center of the beveled face disk, and a triangular shaped tuning pocket disposed in the collar. The tuning pocket is structured and operable to control axial movement of the movable sheave on the elongated neck of the driven pulley. The tuning pocket comprises a first gear side, an acceleration side disposed at a positive angle relative to a reference point on the first gear side, and a deceleration side disposed at a negative angle relative to the reference point on the first gear side.

An adjustable mass clutch weight for use in a CVT clutch is provided. The adjustable mass clutch weight may include an elongate body having a heel and a tip; a first protrusion having external threads extending from a first side of the elongate body at the heel. The adjustable mass clutch weight may also include a second protrusion having external threads extending from a second side of the elongate body at the heel. The adjustable mass clutch weight may also include a mounting aperture extending through the first protrusion, the elongate body and the second protrusion; and at least one mass adjustment weight with a threaded aperture extending through the at least one mass adjustment weight. The at least one mass adjustment weight may be coupled to the first threaded protrusion and/or the second threaded protrusion to adjust the mass of the adjustable mass clutch weight at the heel of the elongate body.

A drive clutch for a continuously variable transmission is provided. A movable sheave assembly is slidably mounted on a post. The movable sheave assembly includes a housing with an interior chamber. Spaced sheave ramps are positioned within the interior chamber. A spider is received within the housing of the moveable sheave and is statically mounted on the post. The spider includes spaced radially extending spider ramp arms. Each spider ramp arm includes at least one spider ramp. Roller centrifugal elements are received within the interior chamber of the housing of the movable sheave. Each roller centrifugal element includes a sheave ramp roller and at least one spider ramp roller. The sheave ramp roller is configured to engage one of an associated sheave ramp and associated spider ramp and the spider ramp roller is configured to engage the other of the associated sheave ramp and associated spider ramp.