Ball plunger for use in hydraulic lash adjuster and method of making same

Ball plunger for use in hydraulic lash adjuster and method of making same

  • CN 104,061,033 B
  • Filed: 09/23/2009
  • Issued: 11/27/2020
  • Est. Priority Date: 09/23/2008
  • Status: Active Grant
First Claim
Patent Images

1. A method of cold forming a ball plunger blank (300), comprising the steps of:

  • first, providing an ingot (400) having first and second ends (402,404), rotating the ingot 180 °

    ;

    next, pressing the ingot (400) rearwardly at the first end (402) of the ingot to form a cavity (174) defined by walls;

    then forming a spherical outer surface (146) having a final size at said second end (404) of the ingot (400), rotating the ingot by 180 °

    , wherein a dimple is formed in the spherical outer surface (146); and

    finally, at least a portion of the wall is upset to form a shoulder (173) at least partially enclosing the cavity (174) and defining a ball seating surface (162) having a final size.

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