Fluid Injection Valve

摘要

A fluid injection valve includes a fluid inlet tube with a recess and a valve body including a central longitudinal axis. The valve body includes a cavity with a fluid outlet portion. The injection valve also includes a valve needle received in the recess and in the cavity. The valve needle is axially displaceable with respect to the fluid inlet tube and the valve body for preventing a fluid flow through the fluid outlet portion in a closing position and releasing the fluid flow through the fluid outlet portion in other positions. The injection valve includes a spring element arranged in the recess and operable to interact with the valve needle for biasing the valve needle in axial direction towards its closing position, wherein the spring element is configured such that a spring stiffness of the spring element depends on a pressure of fluid in the recess.

主权项

1. A fluid injection valve, comprising:
a fluid inlet tube with a recess, a valve body having a central longitudinal axis and a cavity with a fluid outlet portion, a valve needle received in the recess of the fluid inlet tube and in the cavity of the valve body, the valve needle being axially displaceable with respect to the fluid inlet tube and the valve body between a closing position that prevents a fluid flow through the fluid outlet portion and other positions that allow the fluid flow through the fluid outlet portion, and a spring element arranged in the recess and arranged to interact with the valve needle to bias the valve needle in an axial direction towards the closing position, wherein a spring stiffness of the spring element depends on a pressure of fluid in the recess.