Internal-combustion engines – Poppet valve operating mechanism – Rocker
Patent
1985-10-02
1987-02-24
Cline, William R.
Internal-combustion engines
Poppet valve operating mechanism
Rocker
123 9055, F01L 124
Patent
active
046449132
ABSTRACT:
In an internal combustion engine with overhead valve and overhead cam type valve gear, a self-pumping hydraulic-type lash adjuster located downward from the lubricated camshaft and supplied by oil run-off from the camshaft and associated rocker arm member. The lash adjuster includes a housing with a cylindrical aperture therein in which a first plunger member is tightly slidably fitted for reciprocation forming a power chamber with the lower end of the housing. A second plunger member is relatively loosely fitted in the aperture of the housing and has a portion extending from the upper end of the housing for receiving force inputs from the rotating camshaft and associated rocker arm member. A reservoir chamber is formed by the first and second plunger members and is communicated by one-way check valve means to the power chamber to permit flow from the reservoir to the power chamber, but not otherwise. As the lobes of the camshaft produce pivotal or rocking movement of the rocker arm member, the second plunger member which supports one end of the rocker arm member is alternately cocked in a side-by-side lateral movement within the housing which movement tends to pump oil collected at the upper end of the lash adjuster housing into the reservoir chamber without the need of providing for a pressurized oil feed or passage in the engine cylinder head.
REFERENCES:
patent: 2682865 (1954-07-01), Voorhies
patent: 3605707 (1971-09-01), Line
patent: 4228771 (1980-10-01), Krieg
patent: 4441465 (1984-04-01), Nakamura
patent: 4524731 (1985-06-01), Rhoads
Chrysler Motors Corporation
Cline William R.
MacLean, Jr. Kenneth H.
Neils Peggy A.
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