| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the operation responsiveness of hydraulic equipment while downsizing of an engine even in a structure where a cam shaft is supported by a rolling bearing.SOLUTION: A housing (7) is provided with oil passages (724, 725) which open at one end to a support surface (75) supporting a cam shaft (1). In the cam shaft, annular grooves (12, 13) which are arranged in parallel with each other on an outer peripheral surface (11) so as to communicate with the respective oil passages, and communication passages (14, 15) which allow the respective annular grooves to communicate with advance chambers and retard chambers of a variable valve timing device (2) are formed. A rolling bearing (8) is press-fitted into the outer peripheral surface of the cam shaft so as to divide the interior of the housing from the exterior and inhibit an oil from flowing from the annular grooves to the exterior of the housing.</p> |
