公开(公告)号：US11231109B2

公开(公告)日：2022-01-25

申请号：US16480212

申请日：2018-05-16

申请人： NOK CORPORATION

发明人： Takayuki Oyama ,  Tatsuya Mori ,  Hiroshi Onodera

IPC分类号： F16J15/16 ,  F16J15/3232 ,  F16J15/322 ,  F16J15/3252 ,  F16J15/34

摘要： [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.

公开(公告)号：US10962142B2

公开(公告)日：2021-03-30

申请号：US15781752

申请日：2016-12-06

申请人： NOK CORPORATION

发明人： Takayuki Oyama ,  Nobuhiro Nishimura ,  Hiroshi Onodera ,  Masamichi Kishiro

IPC分类号： F16K41/04 ,  F01L3/08 ,  F16J15/3232

摘要： 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 section 20B is provided with a plurality of annular seal protrusions which respectively include first inclined surfaces 25a and 26a each having a diameter that increases from a radially inward tip toward a seal section 20A side, and second inclined surfaces 25b and 26b each having a diameter that increases from a radially inward tip toward a side opposite to the seal section 20A. The first seal protrusion 25 which is closest to the seal section 20A is configured so that an inclination of the second inclined surface 25b is smaller than that of the first inclined surface 25a, and the second seal protrusion 26 which is farthest from the seal section 20A is configured so that an inclination of the first inclined surface 26a is smaller than that of the second inclined surface 26b.