Delphi Technologies, Inc.

Mahmood Rad

Santos Burrola

Mark A Shost

Jean-Francois Pelka

An evaporative solenoid valve assembly for use in a vehicle fuel system between a filtration canister and an intake manifold includes a plunger having a plunger body with central-bore and an elastomeric insert molded therein to define a stop cushion at the end of the insert proximal the valve stop and a valve tip at the end of the insert proximal the valve seat. The valve assembly may include a valve stop having a non-conducting insert received in an end proximal the plunger to reduce noise and wear as well as to improve magnetic flux path. Yet another improvement includes an enlarged pre-load spring disposed within the plunger to provide better spring force distribution and plunger to valve seat alignment.

Evaporative solenoid control valve with enhanced durability features

An electromagnetically energized actuator featuring low friction, low wear, low impact and low noise attributes. The actuator includes a polymer tube, a stop fixedly disposed in the tube and composed of a highly permeable material, a plunger reciprocably disposed within the tube and composed of a highly permeable material, a spring assembly including a spring which is formed at the facing ends the stop and the plunger which spring serves to bias the plunger away from the stop, a first plate composed of a highly permeable material which is connected to a first end of the tube, and a second plate composed of a highly permeable material which is connected to a second end of the tube. The tube is composed of a polymer which (relative to a conventional brass tube) allows tighter tolerances between the plunger and the tube resulting in lower wear, less sliding noise, reduction in corrosion, and elimination of thinned end of the tube. The preferred tube polymer is VESPEL&reg; with TEFLON&reg; mixture.

Electromagnetically energized actuator

A solenoid valve includes an outlet tube and a plunger stop. A plunger is slidably disposed within the solenoid valve between the outlet tube and the plunger stop. The plunger is movable between a closed position wherein the plunger engages the outlet tube to block fluid flow there through and an open position wherein the plunger is distanced from the outlet tube to permit fluid flow there through. The plunger includes a plunger insert that forms a dome-shaped plunger stop cushion that, during opening of the valve at least partially contacts a flat plunger contact face formed by the plunger stop. The dome-shaped plunger stop cushion relatively effectively damps the impact between the plunger and the plunger stop by allowing the plunger insert material, e.g., rubber, to compress more and absorb more energy of the impact. Thus, signal noise caused by the solenoid valve is minimized.

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Brookfield, WI, United States of America

Mahmood Rad