Nok Corporation

Naoki Meguro

Masamichi Kishiro

Nobuhiro Nishimura

Tatsuya Mori

An elastic body includes an annular main body portion to be disposed in an annular gap, a seal lip portion extending from a portion, closer to an object to be sealed, of the main body portion and being to be in contact with an inner member, a flange portion extending outwardly from an end, opposite to the object to be sealed, of the main body portion and including a first side closer to the object to be sealed, the first side being to be in contact with an outer member, a side lip portion extending from the end opposite to the object to be sealed in a direction away from the object to be sealed, and a projecting portion formed circumferentially on a second side, opposite to the object to be sealed, of the flange portion. The side lip portion has a back surface configured to be in contact with the projecting portion in response to the side lip portion being pressed by a mating member disposed opposite to the object to be sealed.

Sealing device

A sealing device includes an elastic body configured to seal an annular gap between an inner member and an outer member in order to prevent a leak of an object through the annular gap. The elastic body includes an annular main body portion including a first end portion and a second end portion opposite to each other and being to be disposed in the annular gap with the first end portion being closer to the object than the second end portion, a seal lip portion extending from the first end portion and being to be in contact with the inner member, a flange portion extending outwardly from the second end portion and including a first side and a second side opposite to each other, a side lip portion extending from the second end portion in a direction away from the first end portion, and a projecting portion extending from the second side and circumferentially about the annular main body. The first side is to be closer to the object than the second side and to be in contact with the outer member. The projecting portion is located such that the projecting portion is not to be in contact with the side lip portion with a distal end portion of the side lip portion being tilted radially outwardly in response to a front surface of the side lip portion being pressed by a member.

[Problem] To provide a sealing device having high pressure resistance and durability for a reciprocating shaft. [Solution] A sealing device comprising an oil seal member and a dust seal member. The oil seal member and the dust seal member each comprise a rigid ring provided inside a shaft hole and an elastic ring attached to the rigid ring, wherein the elastic ring has formed thereon a lip that slidably contacts a reciprocating shaft. The rigid ring of the dust seal member is detachably fitted in the rigid ring of the oil seal member. The sealing device further comprises another rigid ring provided between the elastic ring of the oil seal member and the elastic ring of the dust seal member in a direction parallel to the axial direction of the reciprocating shaft. This rigid ring is detachably fitted in a concave portion formed radially inward of the rigid ring of the dust seal member and reinforces the elastic ring of the dust seal member.

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Fukushima, Japan

Naoki Meguro