| 摘要 |
<p>The present invention provides in an oil seal for use in an oil ring groove in the side wall of a rotary piston of an internal combustion rotary engine, said oil ring groove having a bottom surface facing axially outwardly from said piston, annular oil ring sealing means disposed in said groove, and a spring disposed in said groove between said sealing means and said groove bottom surface to bias said sealing means in a direction axially of said piston into sealing engagement with an opposing surface of the housing end wall enclosing the piston chamber of said engine, said spring including radially inner and outer concentric circular bands extending circumferentially of said spring and resting on said groove bottom surface, said spring also including spring legs extending from at least one of said bands adapted to engage said sealing means to impart said sealing bias thereto, the improvement wherein at least said outer band is formed of a continuous length of strip material into a smooth circular band, said inner band including a plurality of circumferentially spaced take-up means which in the aggregate reduce the effective circumferential length of said inner band relative to said outer band.</p> |
