Patent ID: 7556006

Claim:
A valve mechanism of an engine, comprising: a valve, said valve including a valve shaft supported by a cylinder head of the engine, said valve opening and closing a port by moving in an axial direction of the valve shaft; a spring retainer, said spring retainer being fixed to an upper end portion of the valve shaft, said spring retainer including a shim-attachment hole having an open end on an upper side thereof, an upper end portion of the valve shaft serving as a base face of the shim-attachment hole; an inner shim, said inner shim being fitted into the shim-attachment hole of the spring retainer from above, a bottom face of said inner shim being in contact with the upper end portion of the valve shaft, and a top face of said inner shim being positioned below an upper edge of the shim-attachment hole; and a tappet, said tappet being disposed above the spring retainer and being capable of moving freely in the axial direction of the valve shaft, said tappet having a protruding portion sticking out of an under face of the tappet and extending downward, the protruding portion being brought into contact with the top face of the inner shim when the protruding portion enters the shim-attachment hole from above.