| 摘要 |
1,078,132. Intake and exhaust systems of four-stroke engines. MASCHINENFABRIK AUGSBURG-NURNBERG A.G. Aug.4, 1964 [July 23, 1963j, No.30642/64. Heading F1B. In a six cylinder four-stroke engine with a large overlap of the opening periods of the inlet and exhaust valves, the intake pipes 7 - 9 and 10 - 12 of each group of the cylinders whose firing times are spaced by 240‹ are joined to common manifolds 13, 14, and the exhaust pipes of each pair of cylinders whose firing times are spaced by 360‹ are joined to a common exhaust pipe. With a firing order 1, 5, 3, 2, 4, 6, the exhaust pipes of cylinders 1 and 6, 2 and 5, 3 and 4, are connected to the pipes (22), (23), (24), Fig.4 (not shown) respectively. The exhaust opening period α, Fig. 1 (not shown) extends over about 390', whereby the exhaust valve from the second cylinder of a pair whose exhaust pipes are joined together opens before that of the first cylinder closes and the exhaust pulse serves to block further exhaust flow from the first cylinder. The exhaust valve operating cam may have a shape 100 Fig. 2, allowing gradual closing of the valve during the intake stroke, or a shape 200 which causes wide reopening of the valve during the intake stroke, or a shape 300 which holds the valve wide open during a large portion of the intake stroke. |
