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.

This disclosure relates to a trigger wheel for a camshaft adjuster, having a side wall extending along a central longitudinal axis, wherein a formed feature made to project in a radial direction of the longitudinal axis is formed in a circumferential region of the side wall. The formed feature is provided at least in part with a wave profile. Moreover, the disclosure relates to a camshaft adjuster having this trigger wheel.

A tensioner system may be replaced by selecting replacement components. Components such as a housing, roller arm, pulley, and index plate locating pin may be selected from a group of housings, roller arms, pulleys, and index plate locating pins, respectively. The selection of the components allows a user to assemble multiple variations of tensioner that are commercially available. The location of the index plate locating pin on the index plate allows for proper orientation of the tensioner in the vehicle in order to apply the proper tension to a belt. The selection of the components may be based on current tensioner model, or based on dimensions measured from the current tensioner.

This disclosure relates to a trigger wheel for a camshaft adjuster, having a side wall extending along a central longitudinal axis, wherein a formed feature made to project in a radial direction of the longitudinal axis is formed in a circumferential region of the side wall. The formed feature is provided at least in part with a wave profile. Moreover, the disclosure relates to a camshaft adjuster having this trigger wheel.

The belt tension idler device increases tension on a belt. A mounting foot secures the belt tension idler to a vehicle. A rotating head that extends from the body of the device contacts the belt to maintain tension against the belt. A tensioning spring biases the device to maintain tension on the belt. The tension reduces slack thereby reducing vibrations from the belt and maintaining proper alignment of the belt.

In an aspect, a tensioner is provided for tensioning a belt on an engine, and includes a base mountable to a stationary member, and a first tensioner arm pivotably connected to the base. The first tensioner arm is biased in a first pivot direction. The tensioner includes a first bumper on one of the base and the first tensioner arm, which is engageable with a first travel limiter on the other of the base and the first tensioner arm to limit travel of the first tensioner arm in a second pivot direction, and a first pulley rotatably mounted to the first tensioner arm and positioned to engage a first section of the belt. The first bumper and the first travel limiter together have a selected first combined spring rate during engagement. The first combined spring rate increases progressively with compression between the first bumper and the first travel limiter.

In an aspect, a V tensioner is provided and includes a first arm and a second arm. A damping structure and a damping system biasing member are provided. The damping system biasing member is positioned axially in between the first and second arms.

A crusher belt tensioning apparatus is arranged for being mounting on a crusher having a driven crusher pulley to actuate a crusher, a drive pulley drivable by a power unit, a belt extending between the crusher pulley and the drive pulley to transfer drive from the power unit to the crusher, and a tension drum mounted on a tension arm for applying a tension force to the belt. The tension arm includes a first relatively short arm portion and a second relatively long arm portion connected to the first relatively short arm portion. The tension drum is movable by a hydraulic cylinder, attached to the relatively short arm portion, between a first belt tensioning operating position in which the tension drum applies tension to the belt and a second belt non-tensioning maintenance position in which the belt is removable from the tensioning apparatus.

In an aspect, a tensioner for tensioning an endless drive member on an engine, is provided, comprising a base that mounts to the engine, a tensioner arm that is pivotally connected to the base for pivotal movement about a tensioner arm axis, a pulley rotatably mounted to the tensioner arm for rotation about a pulley axis that is spaced from the tensioner arm axis, a tensioner spring and a damping member. The tensioner spring is positioned to urge the tensioner arm into an endless drive member. The spring has a first helical end and a second helical end. The first helical end is positioned to transfer force with a first spring end force transfer surface on the base and the second helical end is positioned to transfer force with a second spring end force transfer surface on the tensioner arm. The damping member is positioned in a surrounding relationship with the tensioner spring. The damping member includes a spring force adjustment member having a first end face and a second end face spaced from the first end face by a selected angular spacing. The damping member includes a first portion that contains the spring force adjustment member and that is generally rigid, and at least one second portion that is adjacent the first member and that is flexibly joined to the first member. The spring force adjustment member is positioned between one of the spring ends and one of the spring end force transfer surfaces on one of the base and the tensioner arm. The damping member is frictionally engaged with the other of the base and the tensioner arm during pivotal movement of the tensioner arm relative to the base.

A tensioner comprising a base having a base aperture, the base aperture disposed to receive a driven component, a rotary arm pivotally engaged with the base, an axis of rotation of the rotary arm aligned with a base aperture center, a first pulley journalled to the rotary arm, a swing arm pivotally engaged with the rotary arm about a shaft, the shaft and swing arm each having cooperating frustoconical portions, a torsion spring biasing the pivot arm, a second pulley journalled to the swing arm, a bushing having a frustoconical portion in frictional engagement with the swing arm frustoconical portion, the bushing in fixed relation to the shaft or pivot arm, and a first damping ring frictionally engaged between the rotary arm and the base, a Belleville spring in pressing engagement whereby a normal force is applied to the first damping ring.