An orbital tensioner comprising an annular base, a ring journalled to the annular base on a ball bearing, said ring having a ring axis of rotation (A-A), a first pulley journalled to the ring, a first pulley axis of rotation (B-B) offset from the ring axis of rotation (A-A), a pivot arm pivotally mounted to the ring, a pivot arm pivot axis (C-C) offset from the ring axis of rotation (A-A), a second pulley journalled to the pivot arm, a torsion spring biasing the pivot arm in a first direction, the ball bearing having a first race and a second race, the ring fixed to the first race, the annular base fixed to the second race, and a damping mechanism frictionally disposed between the ring and the base.

An engine includes: a crankshaft pulley; a motor/generator mounted to a side of the engine and including a motor pulley; an auxiliary driving device pulley; a dual tensioner including a tensioner arm of which a first idler pulley is mounted to a first end of the tension arm and a second idler pulley is mounted to a second end of the tension arm, and the tensioner arm rotatable around a center of the motor/generator and a belt connecting the crankshaft pulley, the motor pulley, the auxiliary driving device pulley, the first idler pulley, and second idler pulley.

A first clamping part and a second clamping part, which are movable relative to one another and to a base. A spring fixed between the first and second clamping parts. The spring applies force to the first and second clamping parts in a direction of the reciprocal movement thereof. A first locking part detachably locks the first and second clamping parts to each other when the spring is tensioned. A second locking part detachably locks the second clamping part to the base. The locking parts intermesh by forming a joint with limited motion.

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 first clamping part and a second clamping part, which are movable relative to one another and to a base. A spring fixed between the first and second clamping parts. The spring applies force to the first and second clamping parts in a direction of the reciprocal movement thereof. A first locking part detachably locks the first and second clamping parts to each other when the spring is tensioned. A second locking part detachably locks the second clamping part to the base. The locking parts intermesh by forming a joint with limited motion.

A belt tensioner controls the pretension of a belt for an ancillary component such as a starter/generator. The ancillary component may apply torque in each direction at different times. The starter/generator has a generator shaft and a generator belt pulley around which the belt passes. A flange is fixed to the starter/generator with a bearing sleeve which surrounds the generator shaft. A first tensioning arm and a second tensioning arm are each formed as circular rings and mounted on the bearing sleeve so as to pivot against each other. One tensioning arm is supported on an inner side of the bearing sleeve while the other tensioning arm is supported on the outer side of the bearing sleeve. Two tensioning rollers are mounted on the tensioning arms and apply a pretensioning force to the belt before and after the generator belt pulley in the belt running direction.

In an aspect, a tensioner is provided for tensioning an endless drive member that is engaged with a rotary drive member on a shaft of a motive device. The tensioner includes a base that is mountable to the motive device, a ring that is rotatably supported by the base in surrounding relationship with the shaft of the motive device and which is rotatable about a ring axis, a tensioner arm pivotally mounted to the ring for pivotal movement about an arm pivot axis, and first and second tensioner pulleys. The first tensioner pulley is rotatably mounted to the tensioner arm. The tensioner arm is biased towards a first span of the endless drive member on one side of the rotary drive member. The second tensioner pulley is rotatably mounted at least indirectly to the ring and is biased towards a second span of the endless drive member on another side of the rotary drive member. The ring is rotatable in response to hub loads in the first and second tensioner pulleys that result from engagement with the first and second spans of the endless drive member.

A belt tensioning device for a crusher or a screening machine for tensioning at least one circulating drive belt which is deflected about a belt pulley of a drive and has a load strand and an empty strand. The drive can be driven with a crushing assembly, a screening unit, a generator, or the like of the crusher by the drive belt. The vibrational stress acting on the machine chassis can be significantly reduced in that the belt tensioning device has two tensioning rollers each of which is rotatably mounted on a holder of a tensioning part. One tensioning roller is paired with the empty strand and the other is paired with the load strand. Additionally, the two tensioning parts can be adjusted relative to each other between an open position and a tensioning position, in which the tensioning parts are held against each other at least opposite the tensioning direction. In particular the tensioning parts can be blocked against each other, and the complete closed system can be freely moved linearly using adjustment guides according to the load situation.

A tensioning device for tensioning a traction mechanism of a belt drive comprises a base member; a first tensioning arm pivotably supported on the base member and carrying a first tensioning roller; a second tensioning arm pivotably supported on the base member and carrying a second tensioning roller; a spring arrangement with first and second springs arranged to be effective between the first and second tensioning arms; wherein the two tensioning arms, when being pivoted relative to each other within a first tensioning angle range, are force-loaded against each other by the first spring, wherein the second spring is force-free relative at least to one of the tensioning arms; and wherein the tensioning arms, when being pivoted relative to each other within a second tensioning angle range comprising larger tensioning angles than the first tensioning angle range, are force-loaded against each other by the first spring and the second spring.

A tensioner for a hybrid electric vehicle adjusts tension of the belt which is provided to synchronize rotation of a pulley of a starting motor shaft and rotation of a pulley of a crankshaft. The tensioner for a hybrid electric vehicle may include: a base arm, a driving arm pivotably connected with the base arm, and a driven arm pivotably connected with the base arm. The tensioner further includes an actuator operating so as to autonomously vary an entire length so that one end thereof is fixed to the base arm and the other end thereof is connected with the driving arm; a first pulley rotatably connected with the first pulley connecting portion or the driving arm and rolling while contacting the belt; and a second pulley rotatably connected with the second pulley connecting portion of the driven arm and rolling while contacting the belt.