The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 1997
Filed:
Oct. 31, 1996
Willy Bostelmann, Wels, AT;
Bombardier, Inc., Montreal, CA;
Abstract
A variable ratio drive pulley of the type employed in snowmobiles to transmit a drive from the snowmobile engine to a variable ratio belt drive transmission has a fixed flange and an opposed movable flange which cooperate to drive the belt. The drive pulley is coupled to rotate with the engine crankshaft and the movable flange incorporates centrifugal weights that operate to advance it towards the fixed flange, with a force that increases with speed of rotation to grip the transmission belt between the flanges and apply a driving torque thereto, this torque being applied by both the flanges. To reduce the effects of engine induced vibrations on the centrifugal weights and on the movable flange, a damping structure is incorporated in the torque path between the engine crankshaft and the centrifugal weights and movable flange. The damping structure comprises a hexagonal rubber ring that is positioned between a driving head and the hub of the drive pulley to absorb vibrations which would otherwise be transmitted between these.