Synchronous hydraulic lash adjuster
AssigneeFord Global Technologies, LLC
InventorJames Michael Dosdall
Life of this patent
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Abstract
A system for minimizing lash in the valve components of an internal combustion engine including a lash adjuster assembly with a body having a closed bore formed therein. A piston is slidingly received within the bore. A cam is in communication with one surface of the assembly for imparting motion thereto. The assembly also has a fluid reservoir and chamber formed therewithin. The chamber is formed between the bore bottom surface and the bottom surface of the piston. A valve opening is also formed in the assembly for providing fluid communication between the reservoir and the chamber. A check valve mechanism is in communication with the valve opening for selectively opening and closing the valve opening in response to angular position of the cam.
Claims5
A lash adjuster for minimizing lash in an internal combustion engine having an engine valve actuated by rotation of a cam, comprising:
- a body having a closed bore formed therein;
- a piston slidingly received within and contacting said bore periphery and sealed against fluid communication through said contact, said piston having a top surface and a bottom surface,
- a fluid reservoir formed within said lash adjuster;
- a chamber formed between a bottom surface of said bore and said bottom surface of said piston;
- a valve opening formed in said assembly providing fluid communication between said reservoir and said chamber;
- and
- a valve in communication with said valve opening to open and close said valve opening;
- whereby said valve opens and closes said valve opening in response to a movement of a secondary cam follower which is separate from a primary cam follower which opens and closes said engine valve, and both said primary and secondary cam followers are actuated by said cam.
Dependencies are inferred from the claim text.