Connecting rod with improved fatigue life

Details Connecting rod with improved fatigue life Connecting rod with improved fatigue life

1994-01-19

1996-01-23

Bonck, Rodney H.

Machine element or mechanism

Elements

Pitmans and connecting rods

74579R, F02B 7532

Patent

active

054857651

ABSTRACT:
An automotive connecting rod made with lightweight alloy such as aluminum, having substantially improved durability and fatigue strength without weight penalty. The fatigue life of the beam section connecting two ends of the rod is increased by providing a special small bolt made with a very high tensile strength material, such as steel, built into the beam section to provide more favorable cyclic load variation at that region. A proper preload is provided to the bolt. The bolt size, its preload, and cross-sectional area of the beam section is calculated by an optimization method which includes the steps of taking into consideration the strength and fatigue characteristics of the lightweight alloy and bolt material used, as well as engine parameters such as stroke, rod length, piston and rod weight, operating temperature and RPM.

REFERENCES:
patent: 3238811 (1966-03-01), Longstreth
patent: 3482467 (1969-12-01), Volkel
patent: 3677107 (1972-07-01), Strebel et al.
patent: 4391161 (1983-07-01), Ban et al.
patent: 4425820 (1984-01-01), Swozil

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