A continuously variable transmission includes a transmission belt including a plurality of elements and a ring and wound around V-grooves of first and second pulleys, each of the plurality of elements including a body portion having a saddle surface and a pair of pillar portions extended from the body portion so as to be located on both sides in a lateral direction of the saddle surface, and the ring being disposed between the pair of pillar portions of each of the plurality of elements. When one of the first and second pulleys has its minimum groove width, at least a part in a thickness direction of the ring wound around the one of the first and second pulleys protrudes radially outward beyond an outermost circumference of a surface of the V-groove of the one of the first and second pulleys.

A continuously variable transmission includes a transmission belt including a plurality of elements each including a pair of pillar portions and a ring arranged between the pair of pillar portions of each of the plurality of elements, and a lubricant supply portion arranged on an inner side of the transmission belt in a radial direction. Each of the plurality of elements further includes a pair of rocking edge portions formed away from each other in a width direction, and a non-contact portion extending between the pair of rocking edge portions in the width direction along a saddle surface. A clearance that communicates the non-contact portion and a region on an inner side in the radial direction with respect to the transmission belt is formed between the elements included in a looped portion of the transmission belt around a first or second pulley.

A damper apparatus for a belt element of a belt transmission includes a sliding surface, a bearing receptacle, a first rail half and a second rail half. The sliding surface is arranged to contact a strand of the belt element to dampen the belt element. The bearing receptacle is arranged to align the sliding surface with the strand such that the sliding surface defines a strand travel direction, normal to a transversal direction. The first rail half has a first plunge opening with a first hook lid, and the second rail half has a second plunge opening with a second hook lid. The first rail half and the second rail half are interlockingly connected in contact to each other crosswise to the strand travel direction, and the first hook lid is arranged to plunge into the second plunge opening behind the second hook lid in a gripping manner.

A belt-type continuously variable transmission includes: a primary pulley; a secondary pulley; a belt wound along the primary pulley and the secondary pulley; and a casing accommodating the primary pulley and the secondary pulley. Further, the belt has, in a portion being wound along the secondary pulley, a radially outside end which may be located further radially outside than an outer circumference portion of the secondary pulley, and a distance from a rotation center of the secondary pulley to an internal surface of the casing in a first direction, which is along a straight line passing through rotation centers of the primary pulley and the secondary pulley, is shorter than a distance from the rotation center of the secondary pulley to the internal surface of the casing in a second direction which is orthogonal to the first direction at the rotation center of the secondary pulley.

A belt-type continuously variable transmission includes: a primary pulley; a secondary pulley; a belt wound along the primary pulley and the secondary pulley; and a casing accommodating the primary pulley and the secondary pulley. Further, the belt has, in a portion being wound along the secondary pulley, a radially outside end which may be located further radially outside than an outer circumference portion of the secondary pulley, and a distance from a rotation center of the secondary pulley to an internal surface of the casing in a first direction, which is along a straight line passing through rotation centers of the primary pulley and the secondary pulley, is shorter than a distance from the rotation center of the secondary pulley to the internal surface of the casing in a second direction which is orthogonal to the first direction at the rotation center of the secondary pulley.

A continuously variable transmission system for a hybrid vehicle is described. The system includes a belt-type continuously variable transmission that is adapted to receive torque from more than one power source. The belt-type continuously variable transmission includes a plurality of pulley sets, which are operatively connected by means of a belt extending over width-variable grooves defined between halves of the pulley sets. The belt is held in position by means of belt tightener. More than one pulley sets are adapted to act as drive pulleys for independently receiving torque from the power sources, whereas at least one pulley set is adapted to act as driven pulley for receiving the torque from the drive pulleys and transmitting the torque to a set of drive wheels for running the vehicle.

A continuously variable transmission system for a hybrid vehicle is described. The system includes a belt-type continuously variable transmission that is adapted to receive torque from more than one power source. The belt-type continuously variable transmission includes a plurality of pulley sets, which are operatively connected by means of a belt extending over width-variable grooves defined between halves of the pulley sets. The belt is held in position by means of belt tightener. More than one pulley sets are adapted to act as drive pulleys for independently receiving torque from the power sources, whereas at least one pulley set is adapted to act as driven pulley for receiving the torque from the drive pulleys and transmitting the torque to a set of drive wheels for running the vehicle.

A work vehicle includes an engine and a belt-type continuously variable transmission device provided on a lateral side of the engine and configured to (i) receive power from the engine and (ii) output the power to a traveling device while varying the power in terms of speed. The belt-type continuously variable transmission device has (i) an intake port which is present in the transmission device case and through which cooling air is sucked from outside the transmission device case into the transmission device case as a result of rotation of the rotary fan and (ii) a first exhaust port which is present in the transmission device case and through which the cooling air is discharged from inside the transmission device case as a result of the rotation of the rotary fan. The first exhaust port is present on a side of the exhaust pipe on which side the engine is present, and faces the engine.

A work vehicle includes an engine and a belt-type continuously variable transmission device provided on a lateral side of the engine and configured to (i) receive power from the engine and (ii) output the power to a traveling device while varying the power in terms of speed. The belt-type continuously variable transmission device has (i) an intake port which is present in the transmission device case and through which cooling air is sucked from outside the transmission device case into the transmission device case as a result of rotation of the rotary fan and (ii) a first exhaust port which is present in the transmission device case and through which the cooling air is discharged from inside the transmission device case as a result of the rotation of the rotary fan. The first exhaust port is present on a side of the exhaust pipe on which side the engine is present, and faces the engine.

A belt-slippage diagnostic apparatus for a continuously-variable transmission that includes a primary pulley, a secondary pulley and a belt looped over the primary and secondary pulleys. The belt-slippage diagnostic apparatus includes a slippage determination portion configured to determine occurrence of slippage of the belt on at least one of the primary and secondary pulleys, when a first-order derivative of a gear ratio, which is a ratio of a rotational speed of the primary pulley to a rotational speed of the secondary pulley, is not smaller than a first threshold value and a second-order derivative of the gear ratio is not smaller than a second threshold value.