Patent number: 8025599

Pivot arm tensioner with sliding ratchet mechanism

Original Assignee: BorgWarner Inc.

Field of technology: Vehicles, Engines and Transportation

Patent granted on: Tue, 27 Sep 2011

Patent drawing

Abstract

An engine chain or belt tensioning system includes a tensioner pivot arm with a ratcheting means that includes backlash in an engine timing system. The tensioner system includes a tensioner pivot arm having a fixed pin, radially projecting ratchet teeth, a tensioner pivot arm biasing device, and a ratchet mechanism that engages the radially projecting ratchet teeth. The ratchet mechanism is oriented such that the tensioner pivot arm freely rotates in one direction, but backdrive is limited in the opposite direction.