Anti-rotation deactivation valve lifter

  • US 20050103300A1
  • Filed: 12/27/2004
  • Published: 05/19/2005
  • Est. Priority Date: 10/20/2003
  • Status: Active Grant
First Claim
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1. A valve-deactivating hydraulic lifter for selectively coupling the rotary motion of a cam lobe to the reciprocal motion of a valve pushrod in an internal combustion engine, wherein oil is retained in the lifter during periods of engine shutdown, comprising:

  • a) a lifter body having means for following an eccentric surface of said cam lobe and having a first axial bore and having a groove formed in a wall of said first axial bore, said groove being in communication with an oil gallery in said engine;

    b) a pin housing slidably disposed in said first axial bore and having a transverse bore;

    c) a pair of opposed locking pins slidably disposed in said transverse bore and each having an outer end for selectively engaging said groove to lock said pin housing to said lifter body;

    d) a clocking mechanism for limiting relative rotation between said pin housing and said lifter body; and

    e) a hydraulic lash adjustment mechanism disposed in a second axial bore of said pin housing, wherein said hydraulic lash adjustment mechanism includes a chamber for holding oil, and wherein said pin housing includes an oil supply port in communication with said chamber, and wherein said clocking mechanism causes said oil supply port to be positioned on the top side of said pin housing when said lifter is installed in said internal combustion engine at an angle greater than zero degrees from vertical.

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