Fuel injector with a variable orifice

A variable orifice fuel injector comprising:

• (i) a nozzle body (3) comprising passages for pressured fuel, an inner cylindrical space for receiving two longitudinally displaceable coaxial needle valves (1,2) with an outward opening inner needle valve (1) which is moving away relative to nozzle body large end (306) to reach opening position, and an inward opening outer needle valve (2) which is moving toward nozzle body large end to reach opening position, and a needle valve guide (6) which guides said outward opening needle valve (1) along cylindrical space of said nozzle body, fuel outlets (302) in said nozzle body, and two seal surfaces on said nozzle body with a seal surface (231) which provides sealing for said inward opening needle valve (2) to block fuel, and another seal surface (131) which provides the sealing for said outward opening needle valve (1) and guidance for fuel path, a spring (5) which urges both said two coaxial needle valves (1,2) into biased seating positions to block fuel, a holding cap (4) to hold parts, and a valve block (8) to hold control valves, and
• (ii) said outward opening needle valve (1) which has means to inject fuel into combustion chamber in a hollow conical spray pattern through annular fuel outlet (131′) when it is displaced from seating position to opening positions by driving forces, and
• (iii) said inward opening needle valve (2) which has means to inject fuel into combustion chamber in conventional multiple jet spray patterns through fuel outlets (302) when it is lifted from seating position to opening positions;
• Where in, said variable orifice fuel injector has means to inject fuel in different hollow conical spray patterns and conventional multiple jet spray patterns selectively and independently.