| 摘要 |
<p>PURPOSE:To make the occurrence of valve sticking reducible, by installing a groove in an adjacent space between a land of a spool and a valve hole, while preventing duct from being tanke in a clearance between the spool and the valve hole. CONSTITUTION:In a land 174b of a spool 174 in a shift control valve 106, there is provided with a groove 174m. Line pressure to be fed out of a line pressure oil passage 132 passes through a narrow clearance between a conical part and a valve hole 172, flowing in a port 172b, and those of such a degree of size among dust being contained in oil that fail to pass through the narrowest part of the clearance are collected in the groove 174m. Therefore, the dust exists inside the groove 174m so that it is in no case taken in the section wedged-form clearance and, what is more, no valve sticking occurs in the spool 174.</p> |
