Internal-combustion engines – Two-cycle – Rear compression
Patent
1985-08-09
1987-09-29
Feinberg, Craig R.
Internal-combustion engines
Two-cycle
Rear compression
123378, F02B 3304
Patent
active
046962646
ABSTRACT:
A two-stroke engine is disclosed which is controlled by a carburetor throttle valve and has a crankcase subjected to continuously alternating overpressure and underpressure. A pneumatic control member responsive to a signal dependent on the rotational speed of the engine is in pressure communication with the inner chamber of the crankcase via a valve. The output member of the pneumatic control member is connected with the throttle flap of the carburetor. The valve provided between the crankcase and the pneumatic control member is responsive to a signal for controlling the pressure in the pneumatic control member. This valve can be configured as a resonance control valve fixedly mounted to the housing of the engine. The resonance control valve has a mass oscillator which, at a correspondingly high engine speed and as a result of the vibration frequency associated therewith, acts upon a sealing diaphragm in the resonance control valve to open a pass-through opening communicating with the pneumatic control member.
REFERENCES:
patent: 2431182 (1947-11-01), Mallory
patent: 2627850 (1953-02-01), Willim
patent: 3707143 (1972-12-01), Reese et al.
patent: 3999622 (1976-12-01), Reed
patent: 4323040 (1982-04-01), Block
patent: 4590896 (1986-05-01), Wissmann et al.
Nickel Hans
Schliemann Harald
Vondernau Werner
Weber Jurgen
Wissmann Michael
Feinberg Craig R.
Okonsky David A.
Ottesen Walter
Stihl Andreas
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