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A stave bearing is a simple journal bearing where a shaft rotates in a bearing housing. Rather than the usual arrangement where the fixed part of the bearing surrounds most of the circumference of the shaft in one or two pieces, a stave bearing uses a large number of axial staves to support the shaft. A large housing is made with grooves ...
The first known outboard motor was a small 11 pound (5 kg) electric unit designed around 1870 by Gustave Trouvé, [9] and patented in May 1880 (Patent N° 136,560). [10] Later about 25 petrol powered outboards may have been produced in 1896 by American Motors Co [ 9 ] —but neither of these two pioneering efforts appear to have had much impact.
A ball bearing. A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.
After manufacturing their first outboard motor in 1965, the 5.5 horsepower D55, Suzuki continued producing outboard motors. in 1987, the two-stroke, V6 DT200 Exante engine won the company’s first accolade: the "Most Innovative Products" award from the National Marine Manufacturers Association (NMMA) of the U.S. [6]
The lower half of the main bearings are typically held in place by 'bearing caps' which are secured to the engine block using bolts. The basic arrangement is for each bearing cap to have two bolts, but some engines may have four or six bolts per bearing cap (often referred to as "four-bolt mains" or "six-bolt mains" engines).
Originally using a very oil-rich mixture of 8:1, from 1942 models specified a 10:1 mix which remained until 1979, when a 25:1 mix was ordained. Thereafter, a 50:1 mix was tried for the introduction of the models 125 and 170, but these engines with such a lean mix proved unreliable, and British Seagull resorted to the 25:1 ratio. [5]