초록 ▼

A decompression brake device comprises a valve drive mechanism for driving an exhaust valve of an internal combustion engine. The valve drive mechanism has first, second and third conditions, the first condition being a condition wherein the exhaust valve assumes a fully closed rest position during

A decompression brake device comprises a valve drive mechanism for driving an exhaust valve of an internal combustion engine. The valve drive mechanism has first, second and third conditions, the first condition being a condition wherein the exhaust valve assumes a fully closed rest position during intake, compression and expansion strokes of the engine and a full open position during an exhaust stroke of the engine, the second condition being a condition wherein the exhaust valve assumes the fully closed rest position during the intake stroke of the engine, a slightly open rest position during the compression and expansion strokes of the engine and the full open position during the exhaust stroke of the engine, and the third condition being a condition wherein the exhaust valve assumes the fully closed rest position during the intake stroke of the engine, a largely open rest position during the compression and expansion strokes of the engine and the full open position during the exhaust stroke of the engine. An actuator is used, which has a hydraulically actuated rod which has first, second and third positions to cause the valve drive mechanism to assume the first, second and third conditions respectively. A hydraulic circuit is used for feeding or drawing a pressurized oil to or from the actuator to move the rod to one of the first, second and third positions.

대표청구항 ▼

[ What is claimed is:] [1.] A decompression brake device for use with an internal combustion engine having an exhaust valve, comprising:a valve drive mechanism for driving said exhaust valve, said valve drive mechanism having first, second and third conditions, said first condition being a condition

[ What is claimed is:] [1.] A decompression brake device for use with an internal combustion engine having an exhaust valve, comprising:a valve drive mechanism for driving said exhaust valve, said valve drive mechanism having first, second and third conditions, said first condition being a condition wherein said exhaust valve assumes a fully closed rest position during intake, compression and expansion strokes of a corresponding engine cylinder and a full open position during an exhaust stroke of the engine cylinder, said second condition being a condition wherein said exhaust valve assumes the fully closed rest position during the intake stroke of the engine cylinder, a slightly open rest position during the compression and expansion strokes of the engine cylinder and the full open position during the exhaust stroke of the engine cylinder, and said third condition being a condition wherein said exhaust valve assumes the fully closed rest position during the intake stroke of the engine cylinder, a largely open rest position during the compression and expansion strokes of the engine cylinder and the full open position during the exhaust stroke of the engine cylinder;an actuator having a hydraulically actuated rod which has first, second and third positions to cause said valve drive mechanism to assume said first, second and third conditions respectively; anda hydraulic circuit for feeding or drawing a pressurized oil to or from said actuator to move said rod to one of said first, second and third positions.