In the present invention is a variable related to a valve timing device, and the upper coupler 11 is coupled the housing 10 to be in an open upper end having an interior space, the housing lower support 21 in the interior space at the bottom of the 10 disposed in the upper and lower lifting and that is disposed on the outer surface and the upper end of the housing 10, the lower plunger 20 and the lower plunger 20 with the lower space section 22 between the inner circumferential surface of the vertical lift and the outer circumferential surface and is disposed at the upper end of the housing (10) oil in between the inner peripheral surface receiving the portion 31 and the secondary plunger upper plunger 30 and the upper plunger 30, 32 is provided with its upper end is the top of the conjugate vertical lift (11) in a through-state and with its outer circumferential surface and the housing 10, the upper chamber 41 between the inner peripheral surface is provided with a push rod connecting member 40 and the upper chamber 41, the oil receiving unit in communication with (31) the lifting of the upper plunger 30 This is in accordance with these upper chamber 41 and the oil receiving portion 31 into the oil is circulated so that the oil circulation passage 50 and circulation in a closed through the oil suhwan flow path 50 through which oil is discharged to the outside housing 10, the oil discharge flow path is provided.
Thus, by allowing the oil in a closed circulation through the oil discharge passage suhwan by a predetermined amount to the outer housing to obtain the effects of being able to achieve an overall improvement plunger function improved, and oil cooling and the like.