Manufacturing method for engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHiroki Iguma
Life of this patent
Estimating the term…
Abstract
A manufacturing method for an engine includes: preparing, as a preparing step, a cylinder head having a surface on which a ceiling surface of a combustion chamber is formed; forming, as a film formation step, a thermal insulation film on the ceiling surface; measuring, as a measurement step, a volume of the thermal insulation film; and selecting, as a selection step, a rank for an engine valve to be used in combination with the ceiling surface so as to correspond to an amount of difference of a measured volume of the thermal insulation film from a designed value of a volume of the thermal insulation film, the rank being selected from a plurality of ranks set in correspondence with thicknesses of umbrella portions of engine valves.
Claims4
A manufacturing method for an engine, comprising:
- preparing, as a preparing step, a cylinder head having a surface on which a ceiling surface of a combustion chamber is formed;
- forming, as a film formation step, a thermal insulation film on the ceiling surface;
- measuring, as a measurement step, a volume of the thermal insulation film;
- and
- selecting, as a selection step, a rank for an engine valve to be used in combination with the ceiling surface so as to correspond to an amount of difference of a measured volume of the thermal insulation film from a designed value of a volume of the thermal insulation film, the rank being selected from a plurality of ranks set in correspondence with thicknesses of umbrella portions of engine valves, wherein
- the rank for the engine valve to be selected in the selection step is a rank having a thickness of an umbrella portion, the thickness minimizing an amount of difference of a capacity of the combustion chamber from a designed value of the capacity of the combustion chamber in a case where the umbrella portion of the engine valve is seated on a valve sitting face, the amount of difference being caused due to the amount of difference of the measured volume of the thermal insulation film from the designed value.
Dependencies are inferred from the claim text.