Variable duration valve lifter improvements

  • US 4,913,106 A
  • Filed: 08/28/1989
  • Issued: 04/03/1990
  • Est. Priority Date: 08/28/1989
  • Status: Expired due to Fees
First Claim
Patent Images

1. An engine valve train which includes a valve, a cam of a cam shaft, a bleed-down variable duration hydraulic lifter riding on said cam, and connecting linkage operative between said lifter and said valve, said lifter having an outer cylindrical body riding on said cam and an inner plunger axially slidable within said cylinder body and defining an oil chamber therebetween, said outer cylindrical body defining a seat defining the lowermost position for said plunger, said valve train being characterized by said connecting linkage being of effective length dimension such that at least at low engine operating speeds below on the order of 1000 RPM, said plunger seats in said seat prior to said valve seating.

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