Sealing device
AssigneeNok Corporation
InventorYuichi Tarukawa
Life of this patent
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Abstract
A sealing device has a main lip sealing sealed fluid in a machine inside and a sub lip preventing intrusion of foreign materials in a machine outside, and structured such that both of the lips slidably come into contact with a peripheral surface of a shaft, wherein the sub lip is formed into a shape which is vertical to an axial direction or a shape which is directed to the main lip side, and a stepped shape is provided in the sub lip, the stepped shape unevenly distributing a generation position of a contact pressure peak in relation to the shaft in the sub lip. The sealing device can achieve both the shaft inserting property and the sealing performance in a sealing device having a main lip which seals sealed fluid in a machine inside, and a sub lip which seals foreign materials in a machine outside.
Claims5
A sealing device comprising:
- a main lip which seals sealed fluid in a machine inside;
- a sub lip which prevents intrusion of foreign materials in a machine outside;
- and
- both the lips slidably coming into contact with a peripheral surface of a shaft,
- wherein a stepped shape is provided in the sub lip, the stepped shape unevenly distributing a generation position of a contact pressure peak in relation to the shaft in the sub lip to the machine outside, and
- wherein the sub lip includes a base end that extends axially away from the main lip, a curled portion connected to the base end that curls back toward the main lip, and a lip end that is connected to the curled portion and includes the stepped shape.
Dependencies are inferred from the claim text.