Internal combustion engine

Details Internal combustion engine Internal combustion engine

1989-10-20

1990-09-25

Okonsky, David A.

Internal-combustion engines

Frame construction

Horizontal cylinder

123195H, 384432, F02F 700

Patent

active

049586025

ABSTRACT:
The invention relates to internal combustion engines and especially to two-stroke engines for portable handheld work tools such as motor-driven chain saws or the like. Material made of light metal alloys is used in two-stroke engines for portable handheld tools in order to save weight. Thus, the crankshaft bearing is made of steel while the bearing covers holding the bearing are made of a magnesium alloy. Heating causes the bearing cover to expand by an amount greater than the crankshaft bearing whereby the press fit of the crankshaft bearing can become endangered and, in an extreme case, a clearance can develop between the crankshaft bearing and the bearing cover. According to the invention, the press fit between the crankshaft bearing and the bearing cover is maintained by placing a plastic annular segment therebetween having a thermal expansion coefficient so selected that it compensates for the different thermal expansions of the bearing cover and the bearing.

REFERENCES:
patent: 2945715 (1960-07-01), Burrell
patent: 3304134 (1967-02-01), Allen
patent: 4189193 (1980-02-01), Schumacher
patent: 4287861 (1981-09-01), Lettner et al.
patent: 4546738 (1985-10-01), Visek
patent: 4651691 (1987-03-01), Ogawa
patent: 4693216 (1987-09-01), Ampferer et al.
patent: 4753201 (1988-06-01), Fukuo et al.
patent: 4836159 (1989-06-01), Lobig
patent: 4854746 (1989-08-01), Baugh et al.

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