Patent ID: 8051814

Claim:
An engine comprising: a valve for a cylinder head of the engine; a valve energizing member for energizing the valve in a direction of closing the valve; a valve drive cam rotated in correspondence with a rotation of a crankshaft of the engine; a rocker arm provided swingably between the valve and the valve drive cam, whose one end abuts on the valve drive cam, is pressed according to a rotary drive of the valve drive cam and swings, thereby opening/closing the valve; and a valve stopping mechanism for stopping the opening/closing operation of the valve irrespective of the rotation drive of the valve drive cam in accordance with an operational state of the engine; wherein the valve stopping mechanism is provided between the other end of the rocker arm and the valve and includes: a holder energized to abut on the other end of the rocker arm and reciprocated in the direction of opening/closing the valve in accordance with the swing of the rocker arm; a single stop selecting member provided in the holder and capable of moving between an operating position to open/close the valve in accordance with reciprocating operation of the holder, and a stop position to hold the valve in a valve close position irrespective of the reciprocating operation of the holder, wherein the valve has a valve body for opening/closing the communication part and a valve stem connected to the valve body and extending toward the valve stopping mechanism, and the single stop selecting member is formed with a plunger-side stem receiving hole which is adapted to receive a tip of the valve stem depending on whether the single stop selecting member is in the operating position or the stop position, wherein the holder comprises: a projecting portion projecting in an axial direction from a center of an upper surface of the holder; and upper and lower guide walls having inner and outer cylindrical-shaped surfaces, the outer cylindrical-shaped surfaces of the guide walls guiding a sliding movement of the holder directly along a cylindrical wall of a guide hole formed in the cylinder head, and the inner cylindrical-shaped surface of the upper guide wall facing the projecting portion.