| 摘要 |
PURPOSE:To improve combustibility by stopping operation of intake and exhaust valves under small load for making partial-cylinder operation, and narrowing opening degree of operating valves. CONSTITUTION:A longitudinal hole 8 of a bridge 2 is fit with free sliding movement around a bridge guide shaft 4 planted in a cylinder head 6. A piston 11 with longitudinal grooves (b) (c) is fit with free sliding movement in a wider- diameter longitudinal hole 10 continuing from the longitudinal hole 8. A base panel 12 is installed at the lower part of the piston 11 inside the longitudinal hole 8 to form an oil chamber 13 between the base panel 12 and the piston 11. An oil duct (A) inside the cylinder heat 6 is connected to an oil duct (C) inside the bridge guide shaft 4 and an oil duct (G) inside the bridge 2, and an oil port 26 is substantially closed by the piston 11. The piston 11 is rotated by a control lever 20 through gears 11' and 23. Under small load, the lever 20 is moved to control the piston 11 so that the longitudinal groove (b) or (c) meets the oil port 26, thus the opening degree of intake and discharge valves can be narrowed. |
