Herein disclosed is a fuel injection valve of electromagnetic control type, which is to be used in a gasoline engine. The fuel injection valve has a tubular control valve 5 fitted in a nozzle body 4, and an armature 7 is fitted on and welded to the outer circumference of the rear portion of said tubular control valve 5. On the leading end of the tubular control valve 5, moreover, there is fixed a ball 6 which has a diameter larger than that of the tubular control valve 5 and has its largest-diameter portion contacting linearly with the conduit 42 of the nozzle body 4. The ball 6 is formed in its region containing the tangent 60 with a plurality of grooves 62 which are angled to intersect the axis of the tubular control valve 5. The ball 6 functions not only as a valve seat but also stroke guide means and means for applying a rotational energy to the fuel.
The electromagnetically operable valve has the an axially moveable valve needle which is formed from an armature, a valve-closure member and a connecting part connecting the two parts. The tubular connecting part has an elongated slit which, because of widenings of the starting sheet-metal part, has a smaller opening width at the end facing the valve-closure member than over its remaining axial extension. Thus, the valve-closure member can be attached very securely at the lower end of the connecting part by a welded seam, avoiding disadvantageous sink marks. The valve is suitable to be used in fuel-injection.
A fuel injection valve includes a valve-closure member which is provided with semicircular flattenings. The deflecting surfaces delimiting the flattenings and formed obliquely to the longitudinal valve axis cause a rotational energy to be applied to the fuel. The application of rotational energy to the fuel makes it possible to clearly reduce the change in flow rate caused by the rotational position of the needle, so that the variance in the static flow rate is considerably decreased. The valve is particularly suitable for application in fuel injection systems of mixture-compressing internal combustion engines having externally supplied ignition.
A solenoid valve (10) for use in an electronic shift control system of an automotive automatic transmission. The solenoid valve includes a body (12) having a cylindrical chamber (34) in which a movable armature (34) is slidably received and which is in communication with an inlet (96) for the automatic transmission fluid and an outlet (104). The body defines a cylindrical valve seat (88) in which a cylindrical valve member (90) coupled to the armature is slidably fitted. The valve member has a control port (92) opening onto the circumferential outer surface thereof and an inner passage (94) communicating the control port with the inlet (96). The solenoid valve is operable to control the fluid pressure substantially proportionally to the axial movement of the armature even in a condition in which a large amount of air bubbles are contained in the automatic transmission fluid.
A fuel injection valve that possesses an axially movable valve needle which includes at least one armature and one spherical valve closure element. The armature forms a closure element support which is joined at its downstream end to the valve closure element. The end of the closure element support facing toward the valve closure element is deformed in such a way that a polygonal profile is present. In accordance with the number of profile edges, at least two flowthrough openings, communicating with an inner longitudinal bore, are formed between the closure element support and the surface of the valve closure element, through which openings fuel can easily flow.
