Tensioner and endless drive arrangement

摘要

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.

主权项

1. A tensioner, comprising:
a first tensioner arm and a second tensioner arm, wherein the first tensioner arm is pivotable about a first pivot axis, and the second tensioner arm is pivotally connected to the first tensioner arm so as to be pivotable about a second pivot axis located at a selected distance from the first pivot axis; a first wheel rotationally connected to the first tensioner arm about a first rotation axis, and a second wheel rotationally connected to the second tensioner arm about a second rotation axis, wherein the first and second wheels are configured to engage an endless drive member, wherein the first and second wheels are biased in respective first and second free arm directions; and a spring positioned to bias the second tensioner arm towards a second segment of the endless drive member, wherein at least one of the first and second tensioner arms includes a hub portion that at least partially defines a spring chamber, wherein the spring is positioned in the spring chamber, and wherein the selected distance between the first and second pivot axes is less than a radius of the hub portion.