Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
December 11, 2007
Patent Application Number
10536559
Date Filed
February 19, 2004
Patent Primary Examiner
Patent abstract
In mounting a combined oil control ring in a ring groove formed in a piston, the combined oil control ring is mounted in a form that an opening between but ends of an oil ring body is widened. In such an operation, it is likely that a coil expander falls off the oil ring body thus making the mounting operation cumbersome. To overcome such a drawback, a relationship L1<L2 is established. Here L1 means a axial distance between open peripheries of the groove portion and L2 means a maximum axial distance between peripheries of the groove portion.
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