Wartsila Finland Oy

Markus Niemi

Pekka Hautala

Jukka Kiijärvi

Juha Alajoki

Jyrki Kajaste

Jari Kostamo

Wiliam Brace

Petri Kuosmanen

William Brace

A fuel injector valve () of a piston engine, which comprises a fuel chamber () for the fuel to be injected, a valve needle () for guiding the fuel injection from the fuel chamber () into the cylinder () of the engine, a spring () for pressing the valve needle () towards the closed position, and a piezoelectric actuator () for guiding the valve needle (). Additionally, the injector valve () comprises a drawbar (), which is loosely coupled to the valve needle (), a second drawbar (), which is attached to the piezoelectric actuator () and loosely coupled to the drawbar (), and that the injector valve () comprises a second spring () fitted in connection with the drawbar () for pressing the valve needle () towards the closed position and a third spring () fitted in connection with the second drawbar () for pressing the valve needle () towards the closed position.

Fuel injector valve

A hydraulic actuator () comprising a body (), in which a control arm () and a lift means () provided with a piston surface () are arranged, which lift means is arranged to follow the reference movement of the control arm (), and an inlet port () and an outlet port () for hydraulic medium. The body () encloses a pressure chamber () delimited by the piston surface () of the lift means (), and the movement of the control arm () provides a flow connection between the inlet port () and the pressure chamber () in order to move the lift means (), and the movement of the control arm () in the opposite direction provides a flow connection between the pressure chamber () and the outlet port () in order to move the lift means () in the opposite direction.

Hydraulic actuator

A fuel injection arrangement for a piston engine, the arrangement comprising an injector nozzle () for injecting fuel into the combustion chamber () of the cylinder. A Theological actuator () is arranged in connection with the injector nozzle (), the actuator comprising a space () containing Theological fluid and an apparatus () by means of which the viscosity of the Theological fluid can be changed for controlling the fuel injection.

Injection arrangement for a piston engine

Growing community of inventors

Vantaa, Finland

Markus Niemi