| 摘要 |
PROBLEM TO BE SOLVED: To reduce emission of black smoke by improving combustion efficiency without dropping engine output with a simple structure in relation to a diesel engine. SOLUTION: A direct injection type diesel engine provided with a cavity 5 formed in a shape depressed to an inside at a center part of a circular top surface 4a of a piston 4 and a fuel injection nozzle including a plurality of injection holes injecting fuel toward the cavity 5, and formed to form swirl flow S of air turning in a parallel plane to the top surface 4a in a cylinder, is provided with a lip part 1 formed erectly to height of the top surface 5a right above a spray reaching position P1 where fuel impinges on an inner wall surface 5a at an upper end part of the inner wall surface 5a, and a tapered part 2 formed in a groove shape from an inner circumference end 2a near a spray interference position P2 where fuel injected from the plurality of injection holes impinge on the inner wall surface 5a over an outer circumference end 2b of the piston 4. The inner circumference end 2a is arranged in more downstream side of the swirl flow S than the outer circumference end 2b. COPYRIGHT: (C)2008,JPO&INPIT
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