Patent ID: 7281506
Filing Date: 2007-10-16
Classification: F01L,F15B,Y10T

Abstract:
1. A valve timing control device for an internal combustion engine, comprising: a source of hydraulic pressure; a valve timing control mechanism controlling an opening and closing timing of at least one of an intake valve and an exhaust valve in an advancing direction or retarding direction by means of working fluid supplied from the source of hydraulic pressure; a first passage through which the working fluid is supplied to the valve timing control mechanism to advance the opening and closing timing; a second passage through which the working fluid is supplied to the valve timing control mechanism to retard the opening and closing timing; a control valve disposed between the source of hydraulic pressure and the valve timing control mechanism, the control valve introducing and discharging the working fluid to and from one of the first passage and the second passage; and two substantially identical filters disposed in both of the first passage and the second passage, respectively, said filters being operative to (1) filter out contaminants generated at the passage between the valve timing control mechanism and the control valve and (2) provide a diffusion of fluid pulses.