Variable ratio pulleys for flat belt transmission system
OwnerEmerson L. Kumminventor
Life of this patent
Estimating the term…
Abstract
In a variable radius pulley drive system wherein a flat drive belt engages the central shanks of drive elements supported by the side pulley sheaves and the radial location of the drive elements is determined by the intersection of logarithmic spiral grooves in the pulley disks of the pulley sheaves whereof the stresses on the bearing members of the drive elements can be substantially reduced by disposing the belt element driving line toward or on the center line or axis of the bearing members of the drive elements.
Claims11
In a variable diameter pulley belt drive wherein a pair of pulley sheaves support a series of drive elements between them and a drive belt engages a drive surface on such drive elements, a drive element comprising a central shank, a first bearing member at one end of said central shank and a second bearing member at the other end of said central shank, said central shank having a bearing surface against which a drive belt bears, said first bearing member being adapted to be received in one location in one of said pair of pulley sheaves, said second bearing member being adapted to be received in one location of the other of said pair of pulley sheaves, the center line of said first and said second of said bearing members defining a drive line, the bearing surface of said central shank being disposed to said drive line.
A drive element member comprising two spaced apart bearing members, and a central drive shank between said bearing members, said drive shank being depressed relative to said bearing members for reducing the rotational moment on said drive element.
A variable diameter pulley belt drive comprising a pair of pulley sheaves, a series of drive elements supported between said pair of sheaves, said drive elements having a drive surface adapted to be engaged by a drive belt, each of said drive elements comprising a central shank including said drive surface, a first bearing member at one end of said central shank and a second bearing member at the other end of said central shank, said first bearing member being adapted to be received in one location in one of said pair of pulley sheaves, said second bearing member being adapted to be received in one location of the other of said pair of pulley sheaves, the center line of said first and said second of said bearing members defining a drive line, the bearing surface of said central shank being disposed at said drive line.
Dependencies are inferred from the claim text.