Inventors:
Keith B. Fong - El Paso TX
Veronica Morales - CD. Juarez, MX
Jeffrey Alan Heinrichs - Dayton OH
Javier Gomez - Cd. Juarez Chih, MX
Omar Rocha - Juarez, MX
Assignee:
Delphi Technologies, Inc. - Troy MI
International Classification:
G01L 504
Abstract:
A uniformly preset spring force pre-load among a number of identical solenoid actuated valve assemblies ( ) by uniquely adjusting the spring pocket length (L) of each respective plunger ( ) to accommodate a respective spring ( ) which is uniquely mated thereto. This adjustment is accomplished using a two-component plunger ( ) consisting of a plunger body ( ) having a central bore ( ) and a rod ( ) slidably located within the central bore. The rod ( ) is press-fit into the central bore ( ), and the spring pocket includes a portion of the central bore unoccupied by the rod. By pressing the rod ( ) a selected distance into the central bore ( ), a precisely set spring pocket is obtained which is uniquely correct for a selected spring ( ), in that the selected spring is compressed to a precisely preset spring force pre-load. The adjusted plunger ( ) and spring ( ) are uniquely assigned to each other to collectively form a customized plunger assembly ( ) having a preset spring force pre-load, whereupon a valve assembly ( ) is manufacturable therewith having the precisely preset spring force pre-load. In carrying-out the adjustment of the plunger ( ) with respect to a specific spring ( ), the rod is pressed into the bore by a controllable source of force, such as for example provided by a stepper motor ( ), and the spring force pre-load is monitored by a load cell ( ) to ascertain when the desired spring force pre-load is achieved.