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.

Orbital tensioner assembly

In one aspect, a tensioner is provided, comprising, a first tensioner arm and a second tensioner arm, a first wheel and a second wheel. The first tensioner arm is pivotable about a first pivot axis. The second tensioner arm is pivotally connected to the first arm so as to be pivotable about a second pivot axis located at a selected distance from the first pivot axis. The first wheel is rotationally connected to the first tensioner arm about a first rotation axis. The second wheel is rotationally connected to the second tensioner arm about a second rotation axis. The first and second wheels are configured to engage an endless drive member. The first and second wheels are biased in respective first and second free arm directions.

Tensioner and endless drive arrangement

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.

Endless drive arrangement for hybrid vehicle using two-armed tensioner with non-orbiting arms

A power transmission device 1 includes a variable stiffness unit 41 , which has variable stiffness, receives a torque from a motor A 2 , and transmits the torque to an output unit B, a variable viscosity coefficient unit 42 , which has variable viscosity, receives the torque from the motor A 2 , and transmits the torque to the output unit B, and a controller A 4 which modifies the stiffness of the variable stiffness unit 41 and the viscosity of the variable viscosity coefficient unit 42.

Power transmission device

Endless drive arrangement and improved two-armed tensioning system for same

Tensioner for a belt drive (1), including a rigid element (12) rotatably connected around a first axis (B) and a couple of idle pulleys (17, 18) supported by a rigid element (12) on opposing parts of axis (B) and adapted to cooperate with respective sections (31, 32) of a belt (30) of belt drive (1) The tensioner (2) also includes a mobile element (25) hinged to a second fixed axis (A) carrying the first axis (B)

Gaetano Ferri

Papers

Tensioner for a drive belt of a motor vehicle