| 摘要 |
PROBLEM TO BE SOLVED: To provide a diesel engine which can achieve both the reduction of cooling loss in a low load area and the reduction of soot in middle and high load areas.SOLUTION: When a distance from the central axis of a fuel injection valve to a portion of a lip part of a cavity protruding innermost in the radial direction is represented by a lip radius R(mm), the axial length of an injection hole of the fuel injection valve is represented by an injection hole length L(mm), the diameter of the injection hole is represented by an injection hole diameter D(mm), and the radius of a cylinder is represented by a bore radius B(mm), these values are set to satisfy the following equation (1): [equation 1] 99.4D×(1-3D)×(L+2.7)≤R≤min{237.1D×(1-3D)×(0.8 L+1),2B/3}...(1). |
