DEVICE FOR FASTENING AND SEALING OF METERING VALVE IN FUEL INJECTOR OF INTERNAL COMBUSTION ENGINE Russian patent published in 2003 - IPC

FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: invention relates to fuel injection equipment of internal combustion engines. Proposed device for fastening and sealing of metering valve contains fuel injector with hollow housing and fitted-in nozzle. Metering valve consists of body installed on seat in hollow housing. Valve body is provided with flat surface pressed by ring nut inside hollow housing and part provided with outer surface in form of truncated cone. Seat has part with inner surface in form of truncated cone. Taper of both conical surfaces is the same, and contact tight for liquid is formed between said surfaces by means of ring nut. Valve body has seat surface used as guide surface of injector rod and check chamber arranged coaxially relative to seat surface. Check chamber is provided with intake channel to deliver fuel at high pressure which acts onto rod and said channel communicates with drain chamber through drain channel. Intake channels is arranged radially relative to seat surface at ring space of valve body which serves to accumulate and distribute high pressure fuel. Ring space is arranged at part of valve body to divide corresponding truncated cone surface into two areas. One of areas forms sealing between ring space and drain chamber. Other area forms sealing between ring space and axial space of hollow housing. EFFECT: provision of easy to assemble device featuring long service life. 5 cl, 2 dwg