US 5,201,529 AGranted

Sealing device

AssigneeNok Corporation

InventorStephen R. Heinzen

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Abstract

A sealing device provides sealing between two members adapted for relative concentric motion. The main seal comprises a pair of annual seal members attached respectively to the two members. An auxiliary seal serves to prevent the intrusion of foreign matter into the main seal. The auxiliary seal comprises a minute gap having a spiral flow passage which exerts a screw pump action to discharge external foreign matter to the side opposite to the main seal due to relative rotation. The main seal includes a first seal member having a radially extending flange portion abutting an end surface of a housing. The main seal includes a second seal member having a radially extending portion opposed to the radially extending flange portion of the first seal member. A buffer portion for buffering axial load is located between the flange portion and the radially extending portion.

Claims20

Dependent claims

A sealing device for effecting sealing between two members adapted for concentric relative rotation, of the type in which there is provided between a pair of annular seal members respectively attached to said two members, a main seal portion for sealing an object of sealing and an auxiliary seal portion which is provided on the opposite side of said object of sealing with respect to said main seal portion and which serves to prevent intrusion of external foreign matter into said main seal portion;

wherein said auxiliary seal portion comprises a minute gap having a spiral flow passage which exerts a screw pump action to discharge any external foreign matter to the side opposite to said main seal portion by the relative rotation of said two seal members;
one member being sealed comprising a housing having an axial hole, said axial hole having a peripheral surface;
one annular seal member comprising an axially extending portion disposed in the axial hole of said housing and a radially extending portion extending radially outward from the peripheral surface of the axial hole and abutting an end of the housing;
another annular seal member comprising a radially extending portion spaced from and opposed to the radially extending portion of said one annular seal member;
a buffer member for buffering axial load disposed between the radially extending portion of said another seal member and the radially extending portion of said one seal member at a location radially outward from said peripheral surface of said axial hole.

2 more elements

A sealing device of the type in which seal portions that are in a slidable sealing contact with each other are formed between a first seal member fitted fluid-tight into the inner periphery of an axle hole of a housing and a second seal member fitted fluid-tight onto a shaft inserted into the axle hole of said housing in such a manner as to allow relative rotation;

said first seal member having an outer peripheral portion fitted into the inner periphery of the axial hole of said housing, said first seal member further having a flange portion connected to and extending radially outward from said outer peripheral portion, with said flange portion abutted against an end surface of said housing;
wherein said second seal member is equipped with a radially extending portion situated opposed to said flange portion of said first seal member;
and wherein a buffer portion for buffering axial load is provided between said flange portion and said radially extending portion;
said buffer portion being located radially outward from the connection of said first seal member flange portion to said first seal member outer peripheral portion.

1 more element

Dependencies are inferred from the claim text.