VALVE ASSEMBLY AND FLUID INJECTOR FOR A COMBUSTION ENGINE

摘要

A valve assembly for a fluid injector for an internal combustion engine includes a valve body with a valve recess, a central longitudinal axis, and a first axial end and a second axial end with respect to the central longitudinal axis. A valve needle is axially moveable within the valve recess with respect to the central longitudinal axis. In concurrence with a seal seat area the valve needle prevents a fluid flow through at least one flow hole in its closing position and otherwise enables it. Furthermore, the injector comprises a sac volume step adjacent to the seal seat area forming a part of an inner surface of a wall of the valve body and a sac volume being designed as one end of the valve recess and being limited by a further part of the inner surface of the wall of the valve body.

主权项

1. A valve assembly for a fluid injector for a combustion engine, the valve assembly comprising:
a valve body with a valve recess, a central longitudinal axis and a first axial end and a second axial end with respect to the central longitudinal axis, a valve needle which is axially movable within the valve recess with respect to the central longitudinal axis and which prevents, via contact with a seal seat area of the valve body, fluid flow through at least one flow hole in a closing position of the valve needle, and allows fluid flow through the at least one flow hole in other positions of the valve needle, a sac volume step adjacent to the seal seat area forming a part of an inner surface of a wall of the valve body, a sac volume at one end of the valve recess, the sac volume being limited by a further part of the inner surface of the wall of the valve body, wherein the further part of the inner surface extends away from the sac volume step towards the first axial end of the valve body, and at least one flow hole that penetrates the wall of the valve body in a region of the sac volume from the valve recess to an outside region of the valve body.