Patent ID: 6419164
Filing Date: 2002-07-16
Classification: F02M

Abstract:
A fuel injection valve comprising a valve member (1), which is supported so that the valve member moves bidirectionally to control a fuel outlet opening (4), the valve member (1) has a first pressure opening surface (8), the first pressure opening surface defines an upper portion of a first pressure opening chamber (6), the first pressure opening chamber (6) is connected to a high-pressure fuel source (10) and the pressure in the first opening pressure chamber (6) produces a first pressure opening force against the first opening surface (8), the valve member (1) has a first closing surface (11), the first closing surface defines a lower portion of a first closing pressure chamber (12), the first closing pressure chamber (12) is connected to the high-pressure fuel source (10) and the pressure in the first closing pressure chamber (12) produces a first closing force against the first closing surface (11), actuating means (15, 16, 18, 20, 21) are provided, which introduce a second opening force onto the valve member (1) in order to open the valve member (1), and the second opening force acts on the valve member (1) in addition to the first opening force,the valve member (1) has a second closing surface (24) which defines a lower portion of a second closing pressure chamber (25), wherein the pressure in the second closing pressure chamber (25) produces a second closing force against the second closing surface (24), a compensation piston (28) is provided which defines a compensation pressure chamber (27) that communicates with the second closing pressure chamber (25), and defines a reference pressure chamber (29), a pressure increase produced in the second closing pressure chamber (25) by an opening movement of the valve member (1) is limited by the pressure in the reference pressure chamber (29), which is connected to the high-pressure fuel source (10), with a continuing opening motion of the valve member (1), the pressure in the second closing pressure chamber (25) remains essentially constant as a result of a corresponding adjusting motion of the compensation piston (28), the compensation pressure chamber (27) and the second closing pressure chamber (25) are connected to a fuel supply (38) via a check valve (37), wherein the check valve (37) is oriented so that the check valve opens when there is negative pressure in the compensation pressure chamber (27) and in the second closing pressure chamber (25), and closes when there is an excess pressure in the compensation pressure chamber (27) and in the second closing pressure chamber (25).