| 摘要 |
PURPOSE:To make the whole length of tappets shorter in a device where an oil chamber is provided between an outer and an inner tappet for adjusting a clearance by providing a check valve communicated with an oil well in the outside of a tappet holder for communicating the oil chamber with the oil well. CONSTITUTION:A spring 16 is provided between an outer tappet 3a, on which a cam 2 abuts, and an inner tappet 3b, on which the end of a valve 1 abuts, for energizing both of the tappets in such a way that they are separated to each other, wherein an oil chamber 4 is formed. Oil in an oil well 22 remote from the tappet is communicated with the oil chamber 4 through a check valve 7 provided to a tappet holder 15, the tappet holder 15, a groove on the outer periphery of the outer tappet 3a, and a groove between the outer tappet 3a and the inner tappet 3b. When a clearance between the outer tappet and the inner tappet becomes large, oil flows into he oil chamber through the check valve 7 thereby oil pressure is retained because of the throttling action of each groove when a valve is opened by the cam 2. |
