SUBCHAMBER TYPE COMBUSTION CHAMBER FOR DIESEL ENGINE

摘要

A subchamber type combustion chamber for a diesel engine, which reduces fuel consumption rate and combustion noise. To achieve the object, a subchamber type combustion chamber is communicated with a main combustion chamber through a nozzle hole, a fuel injection nozzle faces into the subchamber, and a glow plug extends into the subchamber. A heat generating portion of the glow plug includes a rod-shaped portion and a projecting portion projecting from an end of the rod-shaped portion. The projecting portion is provided with a convex curved surface projecting from a circular peripheral edge at the end of the rod-shaped portion while the convex curved surface is reduced in diameter. The percentage of value P/D obtained by dividing projection dimension P of the projecting portion from the end of the rod-shaped portion by diameter dimension D at the end of the rod-shaped portion is 3% to 23%.

主权项

1. A subchamber type combustion chamber for a diesel engine in which a subchamber (1) is communicated with a main combustion chamber (2)
through a nozzle hole (3), a fuel injection nozzle (4) faces into the subchamber (1), and a glow plug (5) extends into the subchamber (1), wherein a heat generating portion (6) of the glow plug (5) includes a rod-shaped portion (7) and a projecting portion (8) projecting from an end (7a) of the rod-shaped portion (7), the projecting portion (8) being provided with a convex curved surface (8a) projecting from a circular peripheral edge (7b) at the end (7a) of the rod-shaped portion (7) while the convex curved surface (8a) is reduced in diameter, wherein the percentage of value P/D obtained by dividing projection dimension P of the projecting portion (8) from the end (7a) of the rod-shaped portion (7) by diameter dimension D at the end (7a) of the rod-shaped portion (7) is 3% to 23%.