A tensioning device for a traction drive comprises: a base member; at least one tensioning arm pivotably supported on the base member around a pivot axis, with a tensioning roller which is rotatably supported on a bearing carrier of the tensioning arm; spring means for resiliently loading the tensioning arm, wherein the spring means extend between a first spring support of the tensioning arm and a second spring support of the tensioning device over a circumferential length around the pivot axis; an adjusting mechanism for adjusting the first spring support relative to the bearing carrier of the tensioning roller in circumferential direction about the pivot axis. A method includes adjusting the torque of the tensioning device.

A tensioner comprising a base, a ring engaged with the base, the ring rotatable about a center C within a base opening, a pulley journalled to the ring, a pivot arm pivotally engaged with the ring, a pulley journalled to the pivot arm, a torsion spring disposed between the ring and the pivot arm for urging the pivot arm, a damping assembly frictionally disposed between the base and the ring, a spring applying a normal load to the damping material, and the damping material having a resistance in the range of greater than 0 up to approximately 10,000.

A chain drive for an internal combustion engine, comprises a driving sprocket, at least one driven sprocket, a drive chain coupling the sprockets, a pivotably supported tensioning rail which is pressed against one of the spans of the drive chain, and a slide rail which abuts on another of the spans of the drive chain, wherein the slide rail and the tensioning rail have a common base body, which is arranged such that it is pivotable about a common pivot axis, and the arcuate portion of a slide surface of the slide rail, which comes into contact with the drive chain during operation, has an axis of curvature or axes of curvature, and the arcuate portion of a slide surface of the tensioning rail, which comes into contact with the drive chain, has an axis of curvature or axes of curvature.

A tensioner comprising a base, a ring engaged with the base, the ring rotatable about a center C within a base opening, a pulley journalled to the ring, a pivot arm pivotally engaged with the ring, a pulley journalled to the pivot arm, a torsion spring disposed between the ring and the pivot arm for urging the pivot arm, a damping assembly frictionally disposed between the base and the ring, a spring applying a normal load to the damping material, and the damping material having a resistance in the range of greater than 0 up to approximately 10,000.

In an aspect, a tensioner is provided for tensioning a belt and includes first and second tensioner arms having first and second pulleys respectively. The first and second pulleys are configured for engagement with first and second belt spans, and are biased in first and second free arm directions respectively. A second tensioner arm stop is positioned to limit the movement of the second tensioner arm in a direction opposite the second free arm direction. The second tensioner arm stop is positioned such that, in use, the second pulley is engaged with the endless drive member while the second tensioner arm is engaged with the second tensioner arm stop throughout a first selected range of operating conditions.

A camshaft chain tensioner, comprising: a piston having an exterior circumferential surface that includes at least one groove; an expandable clip, positioned around the exterior circumferential surface, that includes a first end and a second end, the expandable clip being expandable from a resting diameter to an expanded diameter, wherein the expandable clip existing in the resting diameter engages one of the grooves and prevents axial movement of the piston and wherein the expandable clip existing in the expanded diameter permits axial movement of the piston in response to an axial force exerted on the piston; and a clip retention device that releasably engages the expandable clip and inhibits radially outward expansion of the expandable clip to the expanded diameter of the expandable clip.

A belt tensioner, comprising a first and second tensioning arm supported on a generator housing, a first and second tensioning roller attached to the first and second tensioning arms and configured to apply a pre-tensioning force to an auxiliary unit belt drive, and a bow spring clamped between the first and second tensioning arms in axial overlap with the tensioning rollers and configured to produce the pre-tensioning force.

A tensioning arrangement for a traction drive comprises a base member; at least one tensioning arm, which is pivotably mounted relative to the base member about a pivot axis; a tensioning roller that is connected to a carrier element of the at least one tensioning arm by a bearing so as to be rotatable about an axis of rotation; and an adjustment mechanism configured to pivot the bearing relative to the carrier element within a pivot range and to fasten the bearing in a pivot position within the pivot range. A corresponding device can be provided for adjusting the tensioning arrangement.

A tensioner with a bracket, a tensioner body coupled to the bracket for rotation about a first axis, a first and second wheels that are coupled to the tensioner body for rotation about second and third axes, respectively, that are parallel the first axis, and a spring that biases the second wheel along a line of action relative to the tensioner body. The second wheel is coupled to the tensioner body for movement between first and second positions along the line of action.

A tensioner comprising a carrier pivotably mountable to a mounting surface, an arm having a first pulley journalled thereto and a second pulley journalled thereto, the arm slidingly engaged with the carrier for a linear movement with respect to a carrier axis A-A, and a spring disposed between the carrier and the arm, the spring resisting an arm movement along carrier axis A-A.