초록 ▼

A fuel injector has an internal heater energized during cold starting to reduce emissions, the heater being a ceramic hollow cylinder disposed within a valve body just upstream of a valve seat where fuel is injected through an orifice into the engine. Conductors for energizing the heater extend into

A fuel injector has an internal heater energized during cold starting to reduce emissions, the heater being a ceramic hollow cylinder disposed within a valve body just upstream of a valve seat where fuel is injected through an orifice into the engine. Conductors for energizing the heater extend into the valve body and are sealed against the escape of pressurized fuel. In one version, the conductors extend through an O-ring to be sealed. In another version the conductors include pins extending through the valve body sidewall with glass seals fused to the valve body and the pins. The conductors may comprise flat foil strips clamped between the O-ring and an elastomeric washer. The conductors also may be molded into the magnetic coil bobbin and sealed where the conductors emerge into the fuel cavity. The heater has metallized surfaces to create current flow through its wall thickness, and the conductors are electrically connected respectively to the inner end and outer surfaces of the hollow cylinder by metallization patterns enabling both mechanical contacts on the outside of the heater.

대표청구항 ▼

[ What is claimed is:] [1.] A fuel injector comprising:a valve body having a bore therein adapted to receive fuel;a valve seat mounted at one end of the valve body having an orifice;a needle valve having one end mounted to an armature and another end configured to be seated onto the valve seat to cl

[ What is claimed is:] [1.] A fuel injector comprising:a valve body having a bore therein adapted to receive fuel;a valve seat mounted at one end of the valve body having an orifice;a needle valve having one end mounted to an armature and another end configured to be seated onto the valve seat to close off fuel outflow from the bore, and unseated from the valve seat to allow fuel to be sprayed from the valve bore;a magnetic coil operator assembly mounted in a housing attached to another end of the valve body, and including electrical connectors to connect the magnetic coil operator assembly to an electrical control circuit;a heater surrounding the needle valve in the bore of the valve body upstream of the valve seat and downstream of the magnetic coil operator assembly so that fuel surrounds the heater;conductors that extend into the bore from the assembly housing, past the magnetic coil operator assembly, and electrically connect to the heater; andsealing means associated with each of the conductors preventing escape of pressurized fuel in the bore past the conductors.