Internal-combustion engines – Poppet valve operating mechanism – Tappet
Patent
1982-09-28
1984-07-31
Lazarus, Ira S.
Internal-combustion engines
Poppet valve operating mechanism
Tappet
123 9052, 123 9046, F01L 134
Patent
active
044623640
ABSTRACT:
An hydraulic lash adjuster is provided with a hollow cylindrical body having a closed bottom at one end thereof and a hollow cylindrical plunger having an apertured bottom at one end thereof slidably disposed within the body to define a reservoir chamber within said plunger and a pressure chamber between the bottom of said cylinder. A spring biased check valve is located within said pressure chamber in operative association with the apertured bottom of said plunger to control the flow of fluid from the reservoir chamber to the pressure chamber. A cup-shaped cap is provided at the outer end of the plunger for engagement with a push rod of a valve mechanism and is provided with a passage communicating the interior of the plunger with the exterior. An annular valve seat ring is slidably disposed within the plunger to divide the reservoir into an upper chamber adjacent the cup-shaped cap and a lower chamber adjacent the bottom of the plunger and the second check valve located in the lower reservoir chamber is spring biased into engagement with the valve seat for controlling the flow of fluid from the upper reservoir chamber to the lower reservoir chamber. First and second annular grooves are formed in the outer surface of the body and the plunger and a port is located in the bottom of each groove with the ports and grooves being located relative to each other for the passage of a fluid from the outside of said body to the upper reservoir chamber.
REFERENCES:
patent: 2812750 (1957-11-01), Lesher
patent: 2941523 (1960-06-01), Bergmann
patent: 3079903 (1963-03-01), Humphreys
patent: 3476093 (1969-11-01), Line
patent: 4347812 (1982-09-01), Kosuda et al.
Aisin Seiki Kabushiki Kaisha
Bailey R. S.
Lazarus Ira S.
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