US 6,637,570 B2Granted

Over-running clutch pulley with composite sealing member

AssigneeNtn Corporation

InventorsJohn Miller, Randall King, Bryce Babcock

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Abstract

An over-running clutch pulley of the preferred embodiment includes a sheave member, a hub member located substantially concentrically within the sheave member, a sealing member, and a clutch member, which cooperate to rotationally engage the drive belt and the cylindrical shaft. The sheave member preferably includes a sheave input section adapted to engage the input device, a sheave clutch section defining a sheave clutch surface, and a sheave flange element. Similarly, the hub member preferably includes a hub output section adapted to engage the output device, a hub clutch section defining a hub clutch surface, and a hub lip element. The sealing member preferably includes a seal outer section frictionally engaged with the sheave flange element, and a seal inner section slidably engaged with the hub lip element. The sealing member preferably functions to substantially seal a cavity defined by the sheave flange element and the hub lip element.

Claims22

Dependent claims

An over-running clutch pulley for rotationally engaging an input device and an output device, comprising:

a sheave member including a sheave input section adapted to engage the input device, a sheave clutch section extending radially inward from said sheave input section and defining a sheave clutch surface, and a sheave flange element extending radially inward and defining a flange inner diameter;
a hub member located substantially concentrically within said sheave member and including a hub output section adapted to engage the output device, a hub clutch section extending radially outward from and axially over said hub output section and defining a hub clutch surface substantially adjacent said sheave clutch surface, and a hub lip element extending radially outward and defining a lip outer diameter, wherein said sheave flange element and said hub lip element cooperate to define a cavity;
a sealing member having a seal outer section and a seal inner section, said seal outer section defining a seal outer diameter greater than said flange inner diameter and being frictionally engaged with said sheave flange element, said seal inner section defining a seal inner diameter less than said lip outer diameter and being slidably engaged with said hub lip element, wherein said sealing member is adapted to substantially seal said cavity;
a clutch member located within said closed clutch cavity and adapted to engage said sheave clutch surface and said hub clutch surface upon the acceleration of said sheave member in a first rotational direction relative said hub member, and to disengage said sheave clutch surface and said hub clutch surface upon the deceleration of said sheave member in the first rotational direction relative said hub member;
and
a slinger member having a base portion mounted to said hub member and an extension portion extending radially outward and providing additional sealing protection for said cavity.

3 more elements

An over-running clutch pulley for rotationally engaging an input device and an output device, comprising:

a sheave member including a sheave input section adapted to engage the input device, a sheave clutch section extending radially inward from said sheave input section and defining a sheave clutch surface, and a sheave flange element extending radially inward;
a hub member located substantially concentrically within said sheave member and including a hub output section adapted to engage the output device, a hub clutch section extending radially outward from and axially over said hub output section and defining a hub clutch surface substantially adjacent said sheave clutch surface, and a hub lip element extending radially outward, wherein said sheave flange element and said hub lip element cooperate to define a cavity;
a sealing member having a seal outer section made from a structural material and a seal inner section made from an elastic material, said seal outer section being frictionally engaged with said sheave flange element, said seal inner section being slidably engaged with said hub lip element, wherein said sealing member is adapted to substantially seal said cavity;
and
a clutch member located within said closed clutch cavity and adapted to engage said sheave clutch surface and said hub clutch surface upon the acceleration of said sheave member in a first rotational direction relative said hub member, and to disengage said sheave clutch surface and said hub clutch surface upon the deceleration of said sheave member in the first rotational direction relative said hub member, a slinger member having a base portion mounted to the hub member and an extension portion extending radially outward and providing additional sealing protection for said cavity.

2 more elements

An over-running clutch pulley for rotationally engaging an input device and an output device, comprising:

a sheave member including a sheave input section adapted to engage the input device, a sheave clutch section extending radially inward from said sheave input section and defining a sheave clutch surface, and a sheave flange element extending radially inward and defining a flange inner diameter;
a hub member located substantially concentrically within said sheave member and including a hub output section adapted to engage the output device, a hub clutch section extending radially outward from and axially over said hub output section and defining a hub clutch surface substantially adjacent said sheave clutch surface, and a hub lip element extending radially outward and defining a lip outer diameter, wherein said sheave flange element and said hub lip element cooperate to define a cavity;
a sealing member having a seal outer section and a seal inner section, said seal outer section defining a seal outer diameter greater than said flange inner diameter and being made from a structural material which allows deflection past said sheave flange element during attachment of said sealing member to said sheave member and allows frictionally engagement with said sheave flange element during use of said over-running clutch pulley, said seal inner section defining a seal inner diameter less than said lip outer diameter and being made from an elastic material which allows slidable engagement with said hub lip element, wherein said sealing member is adapted to substantially seal said cavity;
and
a clutch member located within said closed clutch cavity and adapted to engage said sheave clutch surface and said hub clutch surface upon the acceleration of said sheave member in a first rotational direction relative said hub member, and to disengage said sheave clutch surface and said hub clutch surface upon the deceleration of said sheave member in the first rotational direction relative said hub member;
and
a slinger member having a base portion mounted to said hub member and an extension portion extending radially outward and providing additional sealing protection for said cavity.

4 more elements

Dependencies are inferred from the claim text.