Valves and valve actuation – Electrically actuated valve – Including solenoid
Patent
1995-06-30
1997-01-14
Lee, Kevin
Valves and valve actuation
Electrically actuated valve
Including solenoid
335281, F02M 2507, F16K 3106
Patent
active
055931324
ABSTRACT:
Improvements in an armature-pintle assembly (36) and related stator structure (56, 58) of a solenoid actuator used in an EGR valve (10) for controlling the EGR valve opening in accordance with an electric control current from an engine control system. The stator structure defines an air gap (80) disposed in proximate surrounding relationship to a cylindrical tubular walled portion (126) of the armature (40). The air gap is defined by two confronting, but axially spaced apart, axially extending wall portions (66, 82) of the stator structure. A non-magnetic sleeve member (110) has a tubular cylindrical side wall disposed radially between these stator wall portions and the cylindrical tubular walled portion of the armature. The sleeve has an end wall disposed for abutment with the armature to define a limit of axial travel for the armature-pintle assembly and to provide a spring seat for a helical coiled spring that biases the armature-pintle assembly normally closed. More accurate assembly of component parts and shaping of certain parts provide better control and reduced hysteresis.
REFERENCES:
patent: 4961413 (1990-10-01), Grey et al.
patent: 5435519 (1995-07-01), Everingham
patent: 5460146 (1995-10-01), Frankenberg
patent: 5467962 (1995-11-01), Bircann et al.
patent: 5494255 (1996-02-01), Pearson et al.
Lee Kevin
Siemens Electric Limited
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