초록

An engine brake system for opening an engine exhaust valve recirculates actuating fluid between an actuator and a pump so that demands placed on an oil pump of the engine are minimized.

대표청구항 ▼

An engine brake system for opening an engine exhaust valve, comprising: an actuator including a slave piston having a longitudinal bore therethrough and a further bore extending from the longitudinal bore to a recess on one side of the slave piston, a valve spool disposed in the bore and having a hi

An engine brake system for opening an engine exhaust valve, comprising: an actuator including a slave piston having a longitudinal bore therethrough and a further bore extending from the longitudinal bore to a recess on one side of the slave piston, a valve spool disposed in the bore and having a high pressure annulus and a low pressure annulus spaced from the high pressure annulus wherein the valve spool is movable relative to the slave piston to cause the further bore to be placed in fluid communication with the high pressure annulus or the low pressure annulus, the actuator further including a high pressure inlet coupled to the high pressure annulus and a low pressure outlet coupled to the low pressure annulus; and a pump having a pump inlet coupled to the low pressure outlet and a pump outlet coupled to the high pressure inlet to form a closed-loop system with the actuator.