| 摘要 |
<p>A portion of drain oil discharged from a spark retarding hydraulic chamber (34) and led out from a port (21) to a port (20) is introduced through an oil introducing groove (18), which is provided in the outer periphery of a land section (17a) of a spool valve (17), into a slide bearing section (14d) between a cup member (14) and a plunger (15), and the introduced oil is caused to act as lubricating oil on the slide bearing section. Also, foreign matter within the cup member (14) is discharged from a cup hole section (14b) to a space (B) outside a cup as a plunger (15) reciprocates.</p> |
