摘要:
A piston for an internal combustion engine includes an insert defining an air chamber opening into the combustion chamber. The insert is preformed to a desired configuration and the piston cast around the insert thus providing a means of securing the insert within the structure of the piston. The insert may be located wholly within the piston or may have a flange part which extends over an outer surface of the piston.
摘要:
The invention provides an accumulator type fuel injector system (10) for an i.c. engine comprising an accumulator chamber (12) for containing fuel to be injected via an injector assembly (14). The accumulator chamber (12) is charged with fuel at an elevated pressure via a non-return valve (16) means under control of a solenoid valve means (20) also controlling the injector assembly (14). The arrangement is such that, when the accumulator chamber (12) is being vented via the injector assembly (14), means (30) associated with the chamber (12) subject it to additional venting when the pressure in said chamber (12) has decayed to a predetermined level. Thus, closure of a needle valve (24) and consequently termination of a fuel injection event is determined by fuel pressure which can be varied rather than constructional features of the injector.