Roller follower hydraulic tappet

  • US 4,607,599 A
  • Filed: 05/15/1985
  • Issued: 08/26/1986
  • Est. Priority Date: 05/15/1985
  • Status: Expired due to Term
First Claim
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1. A hydraulic lash adjusting tappet for use in the valve gear of an internal combustion engine comprising:

  • (a) body means having the outer periphery thereof adapted for sliding movement in a bore provided in the engine, said bore of the type supplied by an oil passage communicating therewith;

    (b) roller follower means rotatably received on one end of said body means, said roller follower means adapted for rolling contact with an engine camshaft;

    (c) registration surface means adapted for moveable registration thereagainst comprising at least one especially configured surface formed on said body means remote from said follower means and adapted for registration thereagainst for orienting said body means in said bore for ensuring proper alignment of said roller means with the engine camshaft;

    (d) plunger means, including hydraulic lash adjusting means, said plunger means moveably received in a cavity formed in said body means, said plunger formed to interfit said cavity so as to form a hydraulic pressure chamber and define precision leakdown surfaces therebetween;

    (e) said body means defining a fluid inlet port disposed on the periphery thereof for communicating with said engine bore oil passage when said body means is oriented in said bore by said registration means, said body means further defining a pair of localized collector surface means diametrically opposite thereon, said collector surface means disposed axially coincident with and circumferentially spaced from said registration surface means to provide a circumferentially staggered and on the periphery of said body means for leakage control between said body means and said engine oil bore one of said surface means disposed to communicate with said fluid inlet port, said collector surface means further including passage means operable to maintain communication of said engine bore oil passage with said fluid inlet port during movement of said body means in said engine bore caused by contact of said roller means with said engine camshaft.

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