Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1992-09-10
1993-06-08
Herrmann, Allan D.
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
74 44, 92140, 1231974, F16H 2134
Patent
active
052169278
ABSTRACT:
An improved connecting rod assembly for a reciprocating internal combustion engine provides essentially simple harmonic linear motion of a piston, thereby eliminating forces and moments caused by non-simple harmonic linear motion of a piston. The connecting rod assembly of the present invention maintains a uniform distance between a crank pin and a piston. Essentially simple harmonic piston motion also increases engine efficiency by reducing the amount of negative work which results from detonation before top dead center. The connecting rod assembly may include a first member rotatably connected to a crankshaft and having two connection points each spaced a distance A/2 from the crankshaft connection, and second and third members having a length C, arranged in a crossing relationship, and connecting respective ones of the connection points of the first member to respective ones of two connection points on a piston, the piston connection points being spaced apart by a distance B. In one embodiment, the ratios A:B:C are 2:4:5.
REFERENCES:
patent: 1094398 (1944-04-01), Anderson
patent: 1162119 (1915-11-01), Williams
patent: 2806431 (1957-09-01), Woydt
patent: 3421379 (1969-01-01), Carroll
patent: 4505239 (1985-03-01), Deland
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