Oil seal
AssigneeKomatsu Ltd.
InventorsKeisaku Iwakata, Kenji Mihara
Life of this patent
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Abstract
An oil seal (10) includes a first seal (20) for sealing an engine (1) side and a second seal (30) for sealing a flywheel (4) side. The first seal (20) is an axial seal abutted on an inner ring (11) from the direction along the axial direction of a crank shaft (2). The second seal (30) is a radial seal abutted on the inner ring (11) from the direction along the radial direction of the crank shaft (2). A communication hole (25) is provided on the second seal (30), thereby preventing a space (40) surrounded by the first seal (20), the second seal (30) and the inner ring (11) from the occurrence of the negative pressure.
Claims9
An oil seal provided on an outer circumference of a rotary shaft for sealing a first liquid and a second liquid, comprising:
- a ring fixed on the outer circumference of the rotary shaft and provided with a flange projecting outward substantially in the radial direction of the rotary shaft;
- a first seal abutted on the flange from a direction substantially along the axial direction of the rotary shaft for sealing a side on which the first liquid is provided;
- and
- a second seal made of fluorocarbon resin for sealing a side on which the second liquid is provided from a direction substantially along the radial direction of the rotary shaft.
Dependencies are inferred from the claim text.