JPS5981770U - electromagnetic fuel injector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an electromagnetic fuel injector according to the prior art, Fig. 2 is a longitudinal sectional view of an electromagnetic fuel injector that employs an on-off valve having a spherical valve part, and Fig. 3 and the following are implementations based on this invention. For example, FIG. 3 is a vertical sectional view of the main part of the first embodiment, FIGS. 4 to 6 are sectional views of the insert taken along the line A-A in FIG. 3, and FIGS. FIG. 9 is an explanatory diagram showing the relationship between the position of the insert and the injection angle. 22...Valve housing, 23...Fuel injection port, 24...Guide hole, 25...Opening/closing valve, 26...
Communication hole, 26a...conical surface, 26b...cylindrical surface, 2
6C... Hemispherical surface, 27... Valve seat, 29... Insert, 29a... Core part, 29b... Fixed part, 30...
...Slide part, 31...Valve part, 31a...Escape hole, 36. 37. 38...Fuel passage. Correction 1984. 2.16 The scope of claims for utility model registration shall be amended as follows. O Utility Model Registration Claims (1) A valve housing having a fuel injection port and a valve seat at the tip and a guide hole at the shaft center, and the guide hole number 2 at the tip of the slide portion slidably inserted. An on-off valve with a spherical valve element fixed integrally, a movable core coupled to the rear end of the on-off valve, a fixed core facing the rear end surface of the movable core, and a surrounding area of the fixed core. comprising an electromagnetic coil attached to the valve housing and a magnetic case connecting the valve housing and the fixed iron core, and the on-off valve is normally kept in a closed state by being biased by a compression spring;
In an electromagnetic fuel injector for an internal combustion engine, the on-off valve opens and injects pressurized fuel while the electromagnetic coil receives a valve opening signal, and the valve housing is arranged between the fuel injection port and the valve seat. A communicating hole having a cylindrical wall surface with a diameter larger than that of the fuel injection port communicates between the two, and a rod-shaped core having a diameter smaller than the communicating hole and having a hemispherical tip is fitted and fixed in the communicating hole. An insert is press-fitted into the communicating hole, and is formed by fixing portions formed by cutting out a large diameter portion in the axial direction at multiple points in the circumferential direction, and is inserted between the front end surface of the communicating hole and the hemispherical surface of the tip of the core. An electromagnetic fuel injector characterized in that fuel passages are formed at predetermined intervals. (2) The electromagnetic fuel injector according to claim 1, wherein the front end surface of the communication hole of the valve housing is a conical surface. (3) The electromagnetic fuel injector according to claim 1, wherein the front end surface of the communication hole of the valve housing is a part of a spherical surface. (4) The core of the insert of the valve housing also protrudes to the rear of the fixed part, and is inserted into the relief hole machined on the central axis of the tip of the spherical valve part even when the valve is open. The electromagnetic fuel injector according to any one of claims 1 to 3, which is a utility model.

Claims (3)

[Scope of utility model registration request] (1) A valve housing having a fuel injection port and a valve seat at the tip and a guide hole at the shaft center, and a spherical valve housing that is integrally fixed to the tip of the slide part that is slidably inserted into the guide hole. An on-off valve with a valve element, a movable core coupled to the rear end of the on-off valve, a fixed core facing the rear end face of the movable core and having a fuel passage in the shaft center, and the surroundings of the fixed core. It consists of an electromagnetic coil attached to the valve housing and a magnetic case that connects the valve housing and the fixed iron core. An electromagnetic fuel injector for an internal combustion engine in which the on-off valve opens and injects pressurized fuel while receiving a valve opening signal, and the valve panorage includes a valve pane that extends between the fuel injection port and the valve seat. , communicating through a communication hole having a cylindrical wall surface with a larger diameter than the fuel injection port, a rod-shaped core having a smaller diameter than the communication hole and a hemispherical tip, and a large diameter portion that is fitted and fixed in the communication hole. and fixing parts cut out in the axial direction at multiple locations in the circumferential direction, and an insert is press-fitted and fixed into the communication hole, and a predetermined interval is provided between the front end surface of the communication hole and the hemispherical surface of the tip of the core part. An electromagnetic fuel injector characterized by having a fuel passage formed therein. (2) Utility model registration claim 1, characterized in that the front end surface of the communicating hole of the valve housing is a conical surface.
The electromagnetic fuel injector described in Section. (3) The electromagnetic fuel injector according to claim 1, wherein the front end surface of the communication hole of the valve housing is a part of a spherical surface. <4) The core portion of the insert of the valve housing also protrudes to the rear of the fixed portion, and is inserted into the relief hole machined on the center axis of the tip of the spherical valve element even when the valve is open. The electromagnetic fuel injector according to any one of claims 1 to 3, which is a utility model.