| 摘要 |
PROBLEM TO BE SOLVED: To increase a valve opening speed without changing the profile or width of a cam and to enlarge an effective work for reducing a fuel consumption. SOLUTION: In this exhaust valve driving device which drives a driving cylinder by a valve driving cam interlocked with a crankshaft and supplys oil pressure to a driven cylinder for driving an exhaust valve, a large diameter piston 23 is arranged in the cylinder chamber 22 of the driven cylinder 21 so as to be slidable within the range of an initial stroke L from a totally closed point CP, and a small diameter piston 24 is slidably arranged in an inner cylinder hole 26 formed in the large diameter piston 23 and the small diameter piston 24 is connected to the exhaust valve and provided with a pressure receiving part 27 to receive a driving power for the large diameter piston 23 within a range from the totally closed point CP to the lower limit Le of the initial stroke.
|
