| 摘要 |
<p>PURPOSE:To reduce loss in pressure to enhance responsiveness, by connecting a hydraulic chamber in a tappet with an accumulator, and as well by intermitting the communication therebetween so that the transmission of drive force between an intake valve and the tappet is intermittently interrupted. CONSTITUTION:A variable volume type hydraulic chamber 27 which is formed between a tappet 23 driven by a cam 23 and one 23 of two intake valves, is connected to an accumulator 37 through a shut-off means 45. In a low speed running of an engine a hydraulic chamber 51 is communicated with the low pressure side so that the shut-off means 45 opens, resulting in that oil is allowed to enter into the accumulator 37 from the hydraulic chamber 27, thereby the movement of the tappet 23 is not transmitted to the intake valve 21. Upon high speed running the hydraulic chamber 51 is communicated with a hydraulic source, and the shut-off means 45 closes so that the hydraulic chamber 27 transmits the movement of the tappet 23 to the intake valve 21.</p> |
