Abstract: A variable valve driving mechanism is provided with an eccentric member (14) having an annular eccentric portion (15), which is eccentric relative to a camshaft (11), and arranged on an outer periphery of the camshaft (11); an intermediate rotating member (16) having a first groove portion (16A) and second groove portion (16B), which extend in radial directions, and rotatably supported on the eccentric portion (15); a cam lobe (12) having a cam portion (6) for opening and closing an intake valve or exhaust valve (2) and arranged concentrically with and rotatable around the camshaft (11) and for rotation relative to the camshaft (11); a first pin member (17,23) slidably fitted at one end thereof in the first groove portion (16A) and connected at opposite end thereof to the camshaft (11) so that rotation of the camshaft (11) is transmitted to the intermediate rotating member (16); a second pin member (18,24) slidably fitted at one end thereof in the second groove portion (16B) and connected at opposite end ther

Abstract: A fuel injection system has a fuel injection pump (1) having a plunger (1A) disposed in a pressure chamber (1D) and actuatable by a cam (2), and a solenoid-operated valve (6) connected to an injection pipe (4) communicating between the fuel injection pump (1) and a fuel injection nozzle (3), the solenoid-operated valve (6) being disposed near the fuel injection nozzle (3). A controller (C) has an injection advance map and an injection period map both depending on the rotational speed (9) of an engine and the load (10) on the engine. The controller (C) opens and closes the solenoid-operated valve (6) for controlling the supply of fuel from the fuel injection pump (1) to the fuel injection nozzle (3). Since the solenoid-operated valve (6) is disposed near the fuel injection nozzle (3), the fuel can well be cut off when the injection of the fuel is finished, thus reducing HC in exhaust gases and improving fuel economy.