Nozzle hole plate and its manufacturing method

Details Nozzle hole plate and its manufacturing method Nozzle hole plate and its manufacturing method

1999-03-24

2000-10-17

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

239589, 239596, F02M 5900, A62C 3102, B05B 100, F23D 1138

Patent

active

061318272

ABSTRACT:
In a method for manufacturing a nozzle hole plate suitable for use in a fuel injection valve, a nozzle hole is formed at a predetermined angle of inclination by press-working with a punch in a thin-plate base material of a nozzle hole plate. When the nozzle hole is formed by press-working, a bluntness (shear drop) and a break face are formed at the corners of the base material at the fluid entrance and the fluid exit of the nozzle hole respectively, and as a result of the formation of this shear drop and break face the flow changes and the injection quantity increases. The injection quantity of the nozzle hole is measured for each nozzle hole plate, and its deviation from a target value is detected. Then, on the basis of the measured injection quantity value, the base material around the fluid entrance of the nozzle hole is notched by press-working using a punch. The material of the base material dimpled by the notching is pushed toward the fluid entrance of the nozzle hole and the shear drop diminishes. Consequently, the quantity of fuel injected through the nozzle hole plate decreases. Thus it is possible to provide a nozzle hole plate and a manufacturing method thereof with which a required injection quantity can be obtained in a short working time.

REFERENCES:
patent: 4828184 (1989-05-01), Gardner et al.
patent: 5109823 (1992-05-01), Yokoyama et al.
patent: 5857628 (1999-01-01), Kubach
patent: 5899390 (1999-05-01), Arndt et al.

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