Automatic compression release for two-cycle engine

Details Automatic compression release for two-cycle engine Automatic compression release for two-cycle engine

1984-10-11

1986-10-28

Wolfe, Jr., Willis R.

Internal-combustion engines

Starting device

Compression relieving type

F01L 902, F01L 1308

Patent

active

046192280

ABSTRACT:
Automatic compression release for a two-cycle engine is provided in a simple and effective manner by connecting a chamber defined by a diaphragm to the crankcase of the engine with a fluid flow path defining structure. In the fluid flow path, a check valve and orifice are disposed in parallel. The check valve, for example, a duckbill valve, allows the flow of fluid from the diaphragm chamber to the crankcase but not vice versa, and fluid can bleed through the orifice in either direction. The diaphragm operatively engages a valve stem, and a first spring biases the valve stem so that the valve is in open position. A second spring biases the valve to the closed position, and when the first spring is neutralized by a vacuum drawn in the diaphragm chamber, the valve will close. The valve is in communication with a pressure relief opening at an end of the engine cylinder opposite the crankcase.

REFERENCES:
patent: Re27410 (1972-06-01), Anderson et al.
patent: 2362838 (1944-11-01), Mallory
patent: 2742380 (1956-04-01), Peters
patent: 3223076 (1965-12-01), Isoda
patent: 3399659 (1968-09-01), Isoda
patent: 3704988 (1972-12-01), Steele
patent: 3807562 (1974-04-01), Goda
patent: 3901272 (1975-08-01), Banners et al.
patent: 4267809 (1981-05-01), Mase et al.
patent: 4287866 (1981-09-01), Ikuta et al.
patent: 4426062 (1984-01-01), Bowron

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