| 摘要 |
<p>To suppress occurrence of a separation of a seal in a valve stem seal including an oil lip and a back pressure lip and fitted to the outer-diameter portion of a valve stem guide. A pressure receiving lip engaging with a guide groove of a valve stem guide is provided in an inner-diameter surface of an inner-diameter rubber portion, and a channel is provided in a portion between a back pressure lip and the pressure receiving lip of the inner-diameter rubber portion so as to guide pressure which has entered from a gap between a valve stem guide and a valve stem to a space between the valve stem guide and the back pressure lip, toward the pressure receiving lip, thereby canceling part of the pressure.
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