Machine element or mechanism – Mechanical movements – Oscillation or reciprocation to intermittent unidirectional...
Patent
1987-11-27
1989-02-14
Herrmann, Allan D.
Machine element or mechanism
Mechanical movements
Oscillation or reciprocation to intermittent unidirectional...
74 32, 74 50, 123197AC, F16H 1904, F16H 2122, F16H 2920
Patent
active
048038903
ABSTRACT:
The conventional crank between the power piston and the crank shaft in a reciprocating engine is replaced by a fixed length moment arm during the power stroke and a scotch yoke during the return stroke.
The motion of a power piston is converted to rotary motion at an output power shaft through the fixed length moment arm. The moment arm is the radius of a sector gear which is non-rotatably secured to the output shaft. The piston rod is modified to include a rack gear and a slot. The slot and the output shaft form the scotch yoke.
The sector gear engages the rack only during the down stroke of the piston. The sector gear disengages just before the down stroke is completed. The piston is then timely returned to the precise position of its next stroke through the scotch yoke.
The fixed length moment arm acts as a lever through the entire stroke of the pistion which reduces combustion pressure and temperature. The reduced combustion pressure permits a smaller combustion charge which saves fuel. The reduced pressure and combustion reduce exhaust pollutants. The stroke can be longer than the conventional crank, thereby applying the power through a greater angular displacement of the power shaft.
Instant torque is achieved through the moment arm.
The invention can be either the two or four stroke type.
REFERENCES:
patent: 813736 (1906-02-01), Pendleton
patent: 1349661 (1920-08-01), Buhl
patent: 1490611 (1924-04-01), Kellum
patent: 1841021 (1932-01-01), Everts
patent: 2470246 (1949-05-01), Heisman
patent: 4498430 (1985-02-01), Giuliani et al.
patent: 4632081 (1986-12-01), Giuliani et al.
Giuliani Karen A.
Giuliani Mark A.
Giuliani Robert L.
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