Patent ID: 7901310
Filing Date: 2011-03-08
Classification: F02B,F16H

Abstract:
1. A two-arm belt tensioner for a belt drive, comprising: a fixed portion, designed to be fixed to a supporting structure; a first arm and a second arm, carried by said fixed portion and hinged thereto about a common axis; a first pulley and a second pulley, mounted idle on respective ends of said arms and designed to co-operate with respective branches of a belt of said drive; and elastic means, which force said arms towards one another to maintain said pulleys in contact with said respective branches of the belt, said arms comprising respective first arrest elements, which are designed to interact with said fixed portion to define respective first positions of arrest of said arms under the action of said elastic means, and respective second arrest elements, which are designed to interact with said fixed portion to define respective second positions of end-of-travel of said arms under the action of the pull of said belt, said fixed portion comprising a base plate, a pin fixed to said plate and defining said common axis of rotation of the two arms, said belt tensioner being characterized in that said fixed portion includes a single appendage fixedly attached to said base plate, wherein the single appendage is non-movable relative to the base plate, and wherein the single appendage defines a stop for said first and second arrest elements of said arms so as to define for each arm a travel limited between a first position of arrest and a second position of end-of-travel.