초록 ▼

To provide for coupling the injection needle of a Diesel injection valve with an inertia mass, and thereby provide for speed damping of the movement of the valve, the pressurized Diesel fuel is applied to a chamber (20,68) in the valve body (10,12,14), which slidably retains the needle valve element

To provide for coupling the injection needle of a Diesel injection valve with an inertia mass, and thereby provide for speed damping of the movement of the valve, the pressurized Diesel fuel is applied to a chamber (20,68) in the valve body (10,12,14), which slidably retains the needle valve element (18) at a location downstream of the inertia mass, the inertia mass subdividing the chamber into a spring or pressure chamber (20) and a damping chamber (68) forming a dead, or storage chamber for fuel, the inertia mass being slidable in the second chamber and the clearance between the inertia mass and the walls of the chamber forming a throttled connection duct so that, upon command to opening movement, the needle valve element will engage, after a short dead distance (v), the inertia mass (62) which must move against the flow resistance through the throttled connection upon shifting of fuel between the first and second chamber and thus damping the speed of operation of the valve element. The pressure differential at the two sides of the inertia mass will act on the entire cross-sectional area of the inertia mass, to provide high initial damping of the valve needle movement upon initiation of an opening stroke, while permitting a slim construction minimizing external diameter.

대표청구항 ▼

Fuel injection valve-nozzle combination for an internal combustion engine having a valve body (10, 12, 14) formed with an internal space defining a first chamber portion (20) and a second chamber portion (68); a needle valve element (18) slidable in the first chamber portion; means (40, 42, 44) to c

Fuel injection valve-nozzle combination for an internal combustion engine having a valve body (10, 12, 14) formed with an internal space defining a first chamber portion (20) and a second chamber portion (68); a needle valve element (18) slidable in the first chamber portion; means (40, 42, 44) to conduct fuel to the first chamber portion (20) in the valve body; a closing spring (24) bearing against the valve element and the valve body, respectively, and urging the valve element into valve closing position, said valve element being movable to open position upon application of an opening force thereto counter the spring; and an inertia body (62), and coupling means (60) coupling the inertia body to the needle valve element upon opening movement only of the needle valve element, wherein the inertia body (62) is movably retained in the second chamber portion in the body, a throttle connection duct is provided connecting said first and second chamber portions; the outlet (46) from the fuel conduction means into the first chamber (20) is located in said first chamber portion and downstream of the inertia mass (62); wherein the second chamber portion forms a fluid storage chamber and movement of the inertia mass causes throttled displacement of fluid between said chamber portions through said throttle connection duct.