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US 4,902,265 AGranted
Variable speed pulley
AssigneeMitsuboshi Belting Ltd.
InventorHiroshi Takano
Life of this patent
Estimating the term…
Abstract
In order to provide smoother transition for speed changes, a variable speed pulley having a movable sheave half and a fixed sheave half is provided with a torque cam. A spring biases the second sheave half axially of the first sheave to vary the width of a belt receiving groove. The torque cam forces the second sheave half in the same direction as the spring when the torque of a load operatively connected into the pulley assembly is increased. A centrifugal thrust arrangement urges the second sheave half in a direction reverse to the direction caused by the spring responsive to the rotational speed of the pulley.
Claims23
A variable speed pulley comprising:
- a first sheave half;
- means for fixedly mounting the first sheave half on a rotatable shaft defining an axis of rotation;
- a second sheave half;
- means for coaxially mounting said second sheave half on said shaft for rotative and axial movement on said shaft adjacent said first sheave half to define a belt receiving groove therebetween;
- biasing means for biasing said second sheave half axially of the shaft to vary the width of said belt-receiving groove;
- torque means for moving said second sheave half rotatively and axially of the shaft with the force of the biasing means when the torque of a load operatively connected to the pulley is increased;
- and
- urging means for urging said second sheave half axially of the shaft against the biasing force of said biasing means with a force proportional to the speed of rotation of said shaft to vary the width of said belt-receiving groove,
- said urging means comprising means movable with said second sheave half defining a movable surface,
- means fixedly associated with said shaft defining a fixed surface,
- force applying means extending between said movable surface and said fixed surface and having a variable extension parallel to said shaft axis proportional to the centrifugal force acting thereon as a result of said speed of rotation of the shaft.
8 more elements
A variable speed pulley comprising:
- a stationary pulley sheave half mounted fixedly to a shaft;
- a movable pulley sheave half mounted for rotative and axial movement on the shaft adjacent said stationary pulley sheave half and defining therewith a belt receiving groove;
- torque means for moving said second sheave half rotatively and axially of the shaft when the torque of a load operatively connected to the pulley is increased;
- wall means fixedly mounted to the shaft, said wall means and movable pulley sheave half defining therebetween a chamber;
- small spheres in said chamber;
- and
- means for causing said sheave halves to import distributing forces to said spheres as an incident of rotative movement of said movable sheave half on the shaft.
4 more elements
A variable speed pulley comprising:
- a first sheave half;
- means for fixedly mounting the first sheave half on a rotatable shaft defining an axis of rotation;
- a second sheave half;
- means for coaxially mounting said second sheave half on said shaft for rotative and axial movement on said shaft adjacent said first sheave half to define a belt receiving groove therebetween;
- biasing means for biasing said second sheave half axially of the shaft to vary the width of said belt-receiving groove;
- and
- torque means for moving said second sheave half rotatively and axially of the shaft with the force of the biasing means when the torque of a load operatively connected to the pulley is increased;
- urging means for urging said second sheave half axially of the shaft against the biasing force of said biasing means with a force proportional to the speed of rotation of said shaft to vary the width of said belt-receiving groove,
- said urging means comprising means movable with said second sheave half defining a movable surface,
- means fixedly associated with said shaft defining a fixed surface and defining with said movable surface a variable volume space and,
- a plurality of fluidic hard objects disposed in said space between said movable surface and said fixed surface and having a variable extension parallel to said shaft axis proportional to the centrifugal force acting thereon as a result of said speed of rotation of the shaft.
8 more elements
Dependencies are inferred from the claim text.