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Harley-Davidson XA opposed-twin engine runs 100 °F (38 °C) cooler than a V-twin. [4]During WWII, the U.S. Army asked Harley-Davidson to design a specification of a motorcycle much like the BMWs used by German forces, with shaft drive, a boxer engine, and several other features that made the BMWs exceptionally reliable and low-maintenance machines.
A shaft final drive is housed within a rear swingarm of a BMW R1200GS. Power transfer from the gearbox to the rear wheel is accomplished by different methods. Chain-drive uses sprockets and a roller chain, which requires both lubrication and adjustment for elongation (stretch) that occurs through wear. The lubricant is subject to being thrown ...
First of two H-D flat-twin motorcycle designs put into production, first H-D flathead motorcycle. The fork was a trailing link design. D-series (45 solo) 45.1 cu in (739 cc) flathead: 1929–1932 First H-D 45 cubic inch motorcycle, first H-D flathead V-twin motorcycle. R-series (45 solo: R, RL, RLD,) 45.1 cu in (739 cc) flathead 1932–1936
For motorcycles with chain drive, the gearbox output shaft is typically connected to the sprocket which drives the final drive chain. Most modern manual motorcycle gearboxes have "constant-mesh" gears which are always mated but may rotate freely on a shaft until locked by a toothed sliding collar, or "dog clutch".
The amount of power lost due to friction in the transmission (primary drive, gearbox and final drive) depends on the details of the design and construction. Generalizing, a chain drive motorcycle may have some 5-20% less power at the rear wheel than at the crankshaft, while a shaft drive model may lose a little more than that due to greater ...
Harley-Davidson Twin Cam engine at the Harley-Davidson Museum. The Harley-Davidson Twin Cam are motorcycle engines made by Harley-Davidson from 1998 to 2017. Although these engines differed significantly from the Evolution engine, which in turn was derived from the series of single camshaft, overhead valve motors that were first released in 1936, they share a number of characteristics with ...
The U.S. Army also asked Harley-Davidson to produce a new motorcycle with many of the features of BMW's side-valve and shaft-driven R71. Harley-Davidson largely copied the BMW engine and drive train and produced the shaft-driven 750 cc 1942 and '43 Harley-Davidson XA. This shared no dimensions, no parts or no design concepts (except side valves ...
To accommodate chain drive, the ABC used a bevel drive at the gearbox to change the direction of the drive through ninety degrees. [1]: 10 BMW's first motorcycle, the 1923 BMW R 32 was another early example of a longitudinally-mounted flat-twin engine, although it this case the power was transmitted to the rear wheel via a shaft drive. [1]: 26