ROLLER TAPPET WITH COLD ADVANCE

摘要

A cold advance device for advancing the injection beginning in cold condition diesel engine with single plunger pumps, by means of which the injection onset is adjusted in cold conditions and also in normal conditions. A piston is provided in the roller tappet and the roller tappet moves up and down in response to lubricating oil pressure through a plate valve. The lubricating oil lifts the hydro tappet piston enabling the pump plunger to be in the advance position. The pump plunger is lifted an amount corresponds to 8° to 10° crank angle depending upon the cam profile. The stroke of the piston is limited by a stopper and is designed according to the cold advance requirements of the engine. The plate valve is provided with a throttle hole.