| 摘要 |
An engine cylinder head 10 is disclosed having a first camshaft 14 driven by the engine crankshaft via a phasing system 12 mounted to the camshaft 14. A second camshaft 22 is driven via the phasing system 12 mounted to the first camshaft, and two oil control valves 46, 48 are connected to the phasing system for enabling the phasing system to vary the timing of each camshaft independently with respect to the engine crankshaft in response to oil pressure signals from a respective one of the control valves. In the invention, oil feeds from each control valve 46, 48 enter the camshaft 14 via an oil feed journal 34, 36, and connect to the phaser 12 via axially extending channels within the camshaft 14.
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