METHOD OF MAKING BALL PLUNGER FOR USE IN HYDRAULIC LASH ADJUSTER

摘要

PROBLEM TO BE SOLVED: To reduce the machining time of a ball plunger and cost associated therewith.SOLUTION: A method of making a ball plunger includes the steps of: providing a slug 400 having a first end 402 and a second end 404; extruding the slug backward at the first end 402 to form a cavity 174 that is defined by a wall; forming a generally ball-shaped outer surface 146 at the second end 404 of the slug to final dimensions; and upsetting at least a portion of the wall to form a shoulder 173 that at least partially closes the cavity 174 and defines a ball seat surface 162 to final dimensions.