Machine element or mechanism – Elements – Cranks and wrist pins
Patent
1991-06-07
1992-02-18
Braun, Leslie A.
Machine element or mechanism
Elements
Cranks and wrist pins
2988808, 403242, F16C 304
Patent
active
050883453
ABSTRACT:
The invention is directed to a composite crankshaft for a two-stroke engine for portable handheld work tools including chain saws, cutoff machines and the like. In composite crankshafts, a crank pin is connected to a crank web by a press fit wherein the inner diameter of the press-fit bore is expanded toward its axial end in order to reduce stress peaks. In this way, the press-fit surface has a radial spacing with respect to the center longitudinal axis of the press fit which changes. The press fit of the crankshaft of the invention is so configured that the radial distance of the press-fit surface changes in dependence upon the axial spacing to the axial center of the press fit according to an exponential function having the equation f(x)=a.multidot.e.sup.b.multidot.x wherein (a) and (b) are pregiven constants, (x) is the axial spacing and f(x) is the radial spacing. In the composite crankshaft of the invention, stress fields produced by the press fit are substantially uniform and the load on the crankshaft is reduced.
REFERENCES:
patent: 1136524 (1915-04-01), Hartwig
patent: 2009971 (1935-07-01), Kylen
patent: 2747428 (1956-05-01), Peter et al.
patent: 4624156 (1986-11-01), Kamata
patent: 4641546 (1987-02-01), Mettler
Decool Andreas
Kemmler Ralf-Rainer
Stehle Hans P.
Andreas Stihl
Braun Leslie A.
Massey Ryan W.
Ottesen Walter
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