Nok Corporation

Hiroshi Onodera

Masamichi Kishiro

Nobuhiro Nishimura

Takayuki Oyama

Tatsuya Mori

A sealing device that is adapted to be disposed between a reciprocating shaft and an inner peripheral surface of a shaft hole in which the reciprocating shaft is disposed, and that separates an oil side from an atmosphere side, includes an annular oil seal made of a resin, an oil-side rigid ring made of a metal, an elastomeric annular dust seal, and an atmospheric-side rigid ring made of a metal. The oil seal has an oil lip adapted to be in slidable contact with the reciprocating shaft and is formed of a resin having a glass transition temperature of 80 degrees Celsius or higher. The oil-side rigid ring is disposed around the oil seal and supports the oil seal. The dust seal is disposed on the atmosphere side of the oil seal and has a dust lip adapted to be in slidable contact with the reciprocating shaft.

Sealing device

[Problem] To provide a method for manufacturing a sealing device having high pressure-resistance and high durability. Provided is a method for manufacturing a sealing device to be provided between a shaft and an inner surface of a shaft hole in which the shaft is provided, the method comprising: a step for forming an atmosphere-side rigid ring by forming a through-hole in a rigid body by a punching-out process; a step for causing a reinforcement ring for reinforcing an elastic ring to contact the elastic ring in a direction parallel to the axial direction of the shaft, wherein the elastic ring is made of an elastic body, is attached to a liquid-side rigid ring made of a rigid body and disposed inside the shaft hole, is disposed radially inward of the liquid-side rigid ring, and has formed thereon a seal lip that slidably makes sealing contact with the shaft; and a step for causing the atmosphere-side rigid ring to contact the reinforcement ring in a direction parallel to the axial direction of the shaft so that a surface contacted by an end surface of a punch during the punching-out process of the atmosphere-side rigid ring is positioned on an opposite side to the reinforcement ring.

Method for manufacturing sealing device, and sealing device

A valve stem seal with significantly improved sealing performance while improving workability when fitting the valve stem seal to a valve stem guide. An inner peripheral surface of a fitting sectionB is provided with a plurality of annular seal protrusions which respectively include first inclined surfacesandeach having a diameter that increases from a radially inward tip toward a seal sectionA side, and second inclined surfacesandeach having a diameter that increases from a radially inward tip toward a side opposite to the seal sectionA. The first seal protrusionwhich is closest to the seal sectionA is configured so that an inclination of the second inclined surfaceis smaller than that of the first inclined surface, and the second seal protrusionwhich is farthest from the seal sectionA is configured so that an inclination of the first inclined surfaceis smaller than that of the second inclined surface

Growing community of inventors

Fukushima, Japan

Hiroshi Onodera