Fuel injector for internal combustion engine and corresponding method of manufacture

Abstract

The fuel injector (1) includes a hollow body (2), and a metering valve (8) for injection is installed in the hollow body (2). The metering valve (8) has a graduated tube (12) for controlling the fuel flow. Discharge of cavity (11). The scale tube (12) is usually closed by a baffle (13), which is controlled by an electromagnet (17). The electromagnet (17) includes a magnetic core (19) and an electric winding (26). ), the winding (26) is installed in the annular groove (24) of the magnetic core (19). The winding (26) has an outer cylindrical surface (33), forming a gap (61) with the annular groove (24), so that it can be splashed by the fuel flowing out of the scale tube (12). In particular, the winding (26) consists of a spool (28) having a pair of attachments (39) for supporting a plug (34) for supplying power, said core (19) and said plug At least a portion (37) of (34) is enclosed in a block of non-magnetic material (42). The spool (28) has a cylindrical dome (29) and two planar and parallel flanges (31, 32), one of which is adjacent to one end (36) of the plug (34) and the other flange (31). The rim (32) has a smaller diameter to form a channel (63) for the fuel between the graduated tube (12) and the gap (61).

Description

technical field [0001] The present invention relates to a fuel injector for an internal combustion engine and a method of manufacturing the same. [0002] In particular, the invention relates to an injector comprising a hollow body in which is mounted a metering valve for injection, said valve comprising a graduated tube for discharging fuel from a control chamber. The tube is usually closed by a shutter controlled by an electromagnet comprising a magnetic core and electrical windings, the windings being mounted in annular grooves in the core. Background technique [0003] Usually, the electromagnet is fixed in the hollow body with a suitable fixing system, a block made of non-magnetic material is inserted, the fixing system pushes the magnetic core to the fixing boss of the hollow body, for example, a screw screwed on the hollow body nuts. The electrical coil is wound multiple times and is electrically connected to the two plugs of the power supply. The coil is wound on ...

AI Technical Summary

Problems solved by technology

Such injectors have the disadvantage of preventing the dissipation of the heat generated by the winding, which is generated by the activation of the electromagnet

In fact, the windings are completely covered with plastic material, which greatly reduces their ability to exchange heat with the surrounding environment and, in particular, to transfer heat to the diesel, which flows through the magnetic core disposed below

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