Fuel injection valve for diesel engine

Abstract

Abstract PURPOSE:To secure good spray and injection directions at the whole driving range as well as to improve the capacity of combustion, by installig such an injection group as being opened or closed automatically by means of fuel injection pressure and making fuel injectable over the whole driving range, while installing another injection group which spouts the fuel to a high load range alone. CONSTITUTION:Fuel is led into a fuel reserve well 8 via a passage 7 and with fuel oil pressure, a first needle valve 4 is pushed up against the energizing force of a first needle valve spring 6, then flows in a nozzle chamber 21 by way of a first seat part 4a and gets spouted out of a first nozzle hole 1a. At this time, at a high load range, the fuel oil pressure of the nozzle chamber 21 is higher than the calve opening pressure of a second needle valve 14 so that this valve 14 is pushed up against the energizing force of a second needle valve spring 16 whereby the fuel is spouted as well from a second nozzle hole 1b via a second seat part 14a. And, in a low load range, fluid pressure is made to act on a fluid chamber 20 by means of each of valve on-off pressure controlling devices 31-41, controlling the valve opening pressure of the second needle valve 14, and the fuel is also spouted out of the second nozzle hole 1b at every constant injection frequency.

Inventors

• 👤 Yasutaka Irie
• 👤 入江　泰隆

Bibliographic Details