Patent ID: 6505593
Filing Date: 2003-01-14
Classification: F01L

Abstract:
A valve spring set load changing device in a valve moving apparatus of an internal combustion engine having an engine valve for opening and closing a port of a combustion chamber connected with an intake passage or an exhaust passage, a valve spring for forcing said engine valve in a closing direction, a spring seat for supporting an end of said valve spring and a cam for opening said engine valve against said valve spring, wherein: said spring seat includes a base seat and a support seat supporting said end of said valve spring and movable relatively to said base seat, said base seat and said support seat are provided with a direction changing mechanism for changing relative movement between said base seat and said support seat into movement of said support seat in direction of expansion and contraction of said valve spring, an actuator for generating a drive force in accordance with an operational condition of said internal combustion engine and a manipulating mechanism connected with said actuator are provided outside of said spring seat, and at least one of said support seat and said base seat constitutes a driven seat driven by said drive force transmitted through said manipulating mechanism to cause said relative movement of a predetermined amount for changing set load of said valve spring.