| 摘要 |
In a camshaft timing device for an internal combustion engine having a camshaft driven from a driveshaft by way of a camshaft drive which is capable of advancing or retarding the camshaft and therefore the valve timing, the camshaft drive is mounted onto the camshaft by a clamping screw which has a cylindrical opening in which a valve spool is movably disposed for controlling admission of hydraulic fluid to, and its release from, the camshaft drive, the valve spool being actuated by an electromagnetic motor acting against a valve spring biasing the valve spool in one direction for controlling the operation of the hydraulic camshaft drive and the valve spool is pressure balanced for accurate positioning control thereof.
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