Direct injection-type diesel engines
AssigneesMitsubishi Jidosha Kogya Kabushiki Kaisha, NGK Insulators, Ltd.
InventorsHiroshi Oikawa, Naohisa Nakashima, Tadaaki Matsuhisa, Tadao Ozawa
Life of this patent
Estimating the term…
Abstract
A direct injection-type diesel engine includes a piston head formed with a novel piston combustion chamber, with an inner wall surface composed essentially of ceramic material having a low thermal conductivity. The combustion chamber has a reduced opening diameter to enhance a squish air flow out of the clearance space between the piston and the cylinder head, and allows significant reduction of smoke, unburnt hydrocarbon and particulates in the exhaust gas, as well as minimization of thermal loss of the engine.
Claims15
A direct fuel injection-type diesel engine comprising:
- a cylinder with a predetermined bore diameter;
- a cylinder head on said cylinder;
- a piston reciprocably arranged in said cylinder and having a piston head which is formed with a combustion chamber, said combustion chamber including an inner wall surface and an opening which is opposed to said cylinder head;
- as well as a fuel injection nozzle fixedly mounted in said cylinder head for directly injecting fuel into said combustion chamber;
- said combustion chamber having said opening with a diameter which is 55% or less of said cylinder bore diameter, and having a maximum diameter which is 128% or more of said opening diameter, said inner wall surface being composed essentially of ceramic material.
Dependencies are inferred from the claim text.