| 摘要 |
A VALVE TRAIN INCLUDES A PRIMARY ROCKER ARM (50) OSCILLATING ABOUT A PRIMARY OSCILLATING CENTER LINE L4 IN RESPONSE TO THE ROTATION OF AN INLET CAM (21, 24), A SECONDARY ROCKER ARM 60 OSCILLATING ABOUT A SECONDARY OSCILLATING CENTER LINE L5 SO AS TO TRANSMIT A VALVE DRIVE FORCE VIA THE PRIMARY ROCKER ARM (50) TO THE INLET VALVE (14) AND A HOLDER (30) WHICH SUPPORTS THE PRIMARY AND SECONDARY ROCKER ARMS (50, 60) IN AN OSCILLATORY FASHION IN SUCH A MANNER THAT THE PRIMARY AND SECONDARY OSCILLATING CENTER LINES L4, L5 OSCILLATE TOGETHER. A CAM PROFILE (55) HAS A LOST MOTION PROFILE (55a) A DRIVE PROFILE (55b) ARE FORMED ON AN ABUTMENT PORTION (54) OF THE PRIMARY ROCKER ARM (50). A SECTIONAL SHAPE OF THE LOST MOTION PROFILE (55a) IS AN ARC-LIKE SHAPE WHICH IS FORMED ABOUT THE PRIMARY OSCILLATING CENTER LINE L4.
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