Piston valve

Internal-combustion engines – Valved piston – Charge passes from crankcase through valve in piston

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Details

F01L 1100

Patent

active

058099476

ABSTRACT:
A valve is provided for a piston of a two stroke engine wherein the piston has a sidewall and top and bottom surfaces with the top surface having a first opening therein and a second opening extending between the top and bottom surfaces for receiving the valve, and wherein the piston has a plurality of pressure relief openings extending between the top and bottom surfaces. The valve comprises a valve plate positioned in the opening in the top surface overlaying the pressure relief openings with the valve plate having a central opening extending parallel to the sidewall. The valve plate is movable from a seated position covering the pressure relief openings to an unseated position exposing the pressure relief openings when pressure inside the piston exceeds a predetermined value. A retainer pin has an elongated body extending through the central opening in the valve plate, a head atop the retainer pin overlying the valve plate, and a hollow end portion flared radially outward against the bottom surface of the piston to limit upward movement of the retainer pin. The valve opens on the downstroke of the piston to relieve some of the crankcase pressure allowing the piston to descend with less resistance.

REFERENCES:
patent: 581412 (1897-04-01), Capitaine
patent: 931319 (1909-08-01), Krotz
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patent: 3855979 (1974-12-01), Ottaway
patent: 4112882 (1978-09-01), Tews
patent: 4156410 (1979-05-01), Ramsey
patent: 4250844 (1981-02-01), Tews
patent: 5261358 (1993-11-01), Rorke

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