| 摘要 |
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 POSITITON 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 NEGINE, 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.
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