Patent ID: 7578276
Filing Date: 2009-08-25
Classification: F01L

Abstract:
1. An automatic tappet clearance adjusting apparatus for adjusting a clearance between a valve and an adjustment screw in an engine in which said valve, that is normally closed by a spring, is temporarily opened by being pressed by said adjustment screw on a distal end of a rocker arm, said automatic tappet clearance adjusting apparatus comprising: an adjustment unit for advancing and retracting said adjustment screw from the distal end of said rocker arm to adjust a projection of said adjustment screw; a pressure setting unit for adjusting the pressure of an air supply source so as to maintain a constant pressure in accordance with an electric feedback loop and based on a measured signal from a primary pressure sensor for measuring the pressure of said air supply source; a supply pipe extending from said air supply source and communicating with a combustion chamber through a restriction and an ignition plug hole; and a control mechanism for controlling said adjustment unit based on a measured signal from a secondary pressure sensor for measuring the pressure in said supply pipe, wherein the pressure in said supply pipe and said combustion chamber when said valve is closed is set to a pressure in the range from 0.5 to 20.0 kPa.