Seal for a joint or juncture – Seal between relatively movable parts – Piston ring or piston ring expander or seat therefor
Reexamination Certificate
2008-07-08
2008-07-08
Patel, Vishal (Department: 3676)
Seal for a joint or juncture
Seal between relatively movable parts
Piston ring or piston ring expander or seat therefor
C277S449000, C277S466000
Reexamination Certificate
active
10570089
ABSTRACT:
The invention relates to an oil scraper ring for pistons of internal combustion engines. The oil scraper ring comprises a disc that is provided with parallel flanks and a bearing surface having an asymmetrical crowned form with a vertex line extending over the periphery of the disc. A bracing spring arranged in a ring groove of the piston and comprising a spring groove side opposing the piston head and a spring groove side facing the piston head presses the disc radially against the friction and the abrasion of the bearing surface. To this end, at least one of the spring groove sides extends at an angle in relation to the piston axis in such a way that it is radially outwardly inclined to the bracing spring end oriented towards the cylinder, the bearing surface of the disc being embodied in such a way that it corresponds to an almost worn end contour in the started engine state, and, when the oil scraper ring is mounted in the piston, the vertex line of the bearing surface is oriented in the direction of the ring groove side opposing the piston head.
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International Search Report.
Collard & Roe P.C.
MAHLE GmbH
Patel Vishal
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