| 摘要 |
<p>A hydraulic valve member (10) substitutes for valve springs and provides static pressure to bias closed combustion-chamber valves. A valve (18) with the valve stem (16) is guided within a valve cylinder (12). The valve cylinder (12) has interior (20) and exterior (24) annular projections between which an annular hydraulic groove (30) is defined. The valve stem (16) is guided by the interior annular projection (20) and engages a valve piston (34) which reciprocates within the annular hydraulic groove (30). Hydraulic fluid present within the annular hydraulic groove (30) between the valve cylinder (12) and the valve piston (34) serves to urge the valve piston (34) toward the rocker arm (46) and away from the valve cylinder (12). Downward motion of the rocker arm (46) serves to open the valve (18); and upon release, the pressurized hydraulic fluid in the annular hydraulic groove (30) serves to close the valve (18).</p> |
