One-way over-running clutch pulley
First Claim
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1. An over-running clutch pulley for attachment to an input member and for causing rotation of an output member, said clutch pulley comprising:
- a first pulley portion including attachment means for attaching to the input member, said first pulley portion also including a cylindrical extension defining a first inner cylindrical surface of a first diameter;
a second pulley portion having attaching means for attaching to the output member and causing rotation of said output member, said second pulley portion including a portion defining a second inner cylindrical surface, said second inner cylindrical surface having a diameter substantially the same as said first diameter of said first inner cylindrical surface and being coaxial therewith, said first and second inner cylindrical surfaces being located adjacent to one another and cooperating to define a composite inner cylindrical surface of said first diameter;
single bearing means for permitting relative rotation of said first and second pulley portions; and
a coil spring having a free standing outer diameter being greater than said first diameter of said composite inner cylindrical surface, said coil spring frictionally engaging said composite inner cylindrical surface and being retained in engagement therewith by a radially outward normal force inherently exerted by said spring, said spring being wound and oriented in a direction such that positive driving of said first pulley portion relative to said second pulley portion causes said spring to exert an increased outward normal force against said composite inner cylindrical surface whereby said first and second pulley portions are prevented from rotating relative to one another and torque is transferred from said first pulley portion to said second pulley portion, said spring also being oriented such that deceleration of said first pulley portion relative to said second pulley portion causes a decreased outward normal force to be exerted by said spring on said composite inner cylindrical surface whereby said first and second pulley portions are permitted to rotate relative to one another.
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Abstract
An over-running clutch pulley in which a pulley sheave and hub cooperate to define a composite inner cylindrical surface. A coil spring engages the composite cylindrical surface. The spring is oriented to transfer torque from the pulley sheave to the pulley hub when the pulley sheave is driving the pulley hub. The spring allows slip to occur between the pulley hub and sheave when the sheave is decelerated relative to the hub.
150 Citations
30 Claims
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1. An over-running clutch pulley for attachment to an input member and for causing rotation of an output member, said clutch pulley comprising:
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a first pulley portion including attachment means for attaching to the input member, said first pulley portion also including a cylindrical extension defining a first inner cylindrical surface of a first diameter; a second pulley portion having attaching means for attaching to the output member and causing rotation of said output member, said second pulley portion including a portion defining a second inner cylindrical surface, said second inner cylindrical surface having a diameter substantially the same as said first diameter of said first inner cylindrical surface and being coaxial therewith, said first and second inner cylindrical surfaces being located adjacent to one another and cooperating to define a composite inner cylindrical surface of said first diameter; single bearing means for permitting relative rotation of said first and second pulley portions; and a coil spring having a free standing outer diameter being greater than said first diameter of said composite inner cylindrical surface, said coil spring frictionally engaging said composite inner cylindrical surface and being retained in engagement therewith by a radially outward normal force inherently exerted by said spring, said spring being wound and oriented in a direction such that positive driving of said first pulley portion relative to said second pulley portion causes said spring to exert an increased outward normal force against said composite inner cylindrical surface whereby said first and second pulley portions are prevented from rotating relative to one another and torque is transferred from said first pulley portion to said second pulley portion, said spring also being oriented such that deceleration of said first pulley portion relative to said second pulley portion causes a decreased outward normal force to be exerted by said spring on said composite inner cylindrical surface whereby said first and second pulley portions are permitted to rotate relative to one another. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 25, 26, 27, 28, 29, 30)
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23. An over-running clutch pulley for attachment to an input member and for causing rotation of an output member, said clutch pulley comprising:
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a first pulley portion including attachment means for attaching to said input member, said first pulley portion also including a cylindrical extension defining a first inner cylindrical surface of a first diameter; a second pulley portion having attaching means for attaching to said output member and causing rotation of said output member, said second pulley portion including a portion defining a second inner cylindrical surface, said second inner cylindrical surface having a diameter substantially the same as said first diameter of said first inner cylindrical surface and being coaxial therewith, said first and second inner cylindrical surfaces being located adjacent to one another and cooperating to define a composite inner cylindrical surface of said first diameter; bearing means for permitting relative rotation of said first and second pulley portions; a coil spring having a free standing outer diameter being greater than said first diameter of said composite inner cylindrical surface, said coil spring frictionally engaging said composite inner cylindrical surface and being retained in engagement therewith by a radially outward normal force inherently exerted by said spring, said spring being wound and oriented in a direction such that positive driving of said first pulley portion relative to said second pulley portion causes said spring to exert an increased outward normal force against said composite inner cylindrical surface whereby said first and second pulley portions are prevented from rotating relative to one another and torque is transferred from said first pulley portion to said second pulley portion, said spring also being oriented such that deceleration of said first pulley portion relative to said second pulley portion causes a decreased outward normal force to be exerted by said spring on said composite inner cylindrical surface whereby said first and second pulley portions are permitted to rotate relative to one another; and an end cap engaged with said pulley sheave, said end cap sealing over an annular opening defined by said second portion of said pulley sheave and sealing said spring therein, said end cap including failure protection means for retaining said spring in an operative condition when said spring fails or breaks into multiple pieces.
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24. An over-running clutch pulley for attachment to an input member and for causing rotation of an output member, said clutch pulley comprising:
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a first pulley portion including attachment means for attaching to said input member, said first pulley portion also including a cylindrical extension defining a first inner cylindrical surface of a first diameter; a second pulley portion having attaching means for attaching to said output member and causing rotation of said output member, said second pulley portion including a portion defining a second inner cylindrical surface, said second inner cylindrical surface having a diameter substantially the same as said first diameter of said first inner cylindrical surface and being coaxial therewith, said first and second inner cylindrical surfaces being located adjacent to one another and cooperating to define a composite inner cylindrical surface of said first diameter; bearing means for permitting relative rotation of said first and second pulley portions; and a coil spring having a free standing outer diameter being greater than said first diameter of said composite inner cylindrical surface, said coil spring frictionally engaging said composite inner cylindrical surface and being retained in engagement therewith by a radially outward normal force inherently exerted by said spring, said spring being wound and oriented in a direction such that positive driving of said first pulley portion relative to said second pulley portion causes said spring to exert an increased outward normal force against said composite inner cylindrical surface whereby said first and second pulley portions are prevented from rotating relative to one another and torque is transferred from said first pulley portion to said second pulley portion, said spring also being oriented such that deceleration of said first pulley portion relative to said second pulley portion causes a decreased outward normal force to be exerted by said spring on said composite inner cylindrical surface whereby said first and second pulley portions are permitted to rotate relative to one another, said spring including first and second ends formed without tangs engaging either of said pulley hub and said pulley sheave.
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Specification