| 摘要 |
A part of drain oil discharged from a retard hydraulic chamber 34 and led out of a port 21 to a port 20 is introduced through oil introduction grooves 18, which are provided in the outer periphery of a land portion 17a of a spool valve 17, into a slide bearing portion 14d between a cup member 14 and a plunger 15 and caused to serve as lubricating oil. In addition, foreign substances in the cup member 14 are discharged from a cup hole 14b to a cup outside space B as the plunger 15 reciprocatingly slides.
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