Seal for a joint or juncture – Seal between relatively movable parts – Piston ring or piston ring expander or seat therefor
Patent
1997-06-11
1999-02-02
Knight, Anthony
Seal for a joint or juncture
Seal between relatively movable parts
Piston ring or piston ring expander or seat therefor
92107, 92240, 277437, 277558, 277560, F16J 1532, F16J 920, B60T 11236
Patent
active
058654429
ABSTRACT:
A piston seal has formed on one side of the piston body upon which oil pressure works are a tapered surface portion which extends in a direction away from a piston sliding wall and a parallel surface portion. A lip-like seal is formed of a seal base portion which is, in cross section, approximately triangular to fill a space defined between the tapered surface portion and the piston sliding wall, and a lip portion which is formed integrally with the seal base portion. Q indicates the exertion line of a force which presses the lip portion against the piston sliding wall. T is a normal line which extends from the tapered surface portion towards the piston sliding wall. In order to prevent the lines Q and T from intersecting with each other within the bore, the seal base portion is arranged to lie apart from the lip portion in relation to the axial direction of the bore. Such arrangement produces a distribution of contact force exerted from the piston sliding wall upon the lip-like seal, the distribution having two contact reaction force peak values one of which is caused by the lip portion and the other of which is caused by the seal base portion.
Ferguson Jr. Gerald J.
Grafel Gary
Knight Anthony
Kurashiki Kako Co., Ltd.
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