German FEV exhibited an engine that uses roller bearings as the main bearing. Roller bearings have been widely used in two-wheeler engines for a period of time due to their low frictional losses. However, since the bearings are designed in an integrated manner, the crankshaft must be divided depending on the assembly. In addition to the special case of Honda's "S500/600/800", the four-wheeled vehicle with a large number of multi-cylinder divisions and a desire to increase the rigidity of the crankshaft has not been realized.
FEV did not split the crankshaft, but instead adopted the method of dividing the inner and outer rings of the roller bearing. Bearings are purchased products, and the segmented roller bearings have actually appeared in the bearing manufacturer's catalog.
However, it is not possible to envisage its use in engines for durability, and the order also requires quite a few unique specifications. Due to the division of the inner and outer rings, the rollers are rotated across the "seam", so the durability requirements are quite strict. The engine also strengthens the bearing cap that directly withstands explosive power.
The crank pin and the small end portion of the connecting rod are still Plain Bearings. Since the loss caused by the "splashing oil supply" to the main bearing is reduced, the effect of reducing the friction loss particularly at a low temperature condition in which the oil viscosity is high is remarkable.
FEV did not split the crankshaft, but instead adopted the method of dividing the inner and outer rings of the roller bearing. Bearings are purchased products, and the segmented roller bearings have actually appeared in the bearing manufacturer's catalog.
However, it is not possible to envisage its use in engines for durability, and the order also requires quite a few unique specifications. Due to the division of the inner and outer rings, the rollers are rotated across the "seam", so the durability requirements are quite strict. The engine also strengthens the bearing cap that directly withstands explosive power.
The crank pin and the small end portion of the connecting rod are still Plain Bearings. Since the loss caused by the "splashing oil supply" to the main bearing is reduced, the effect of reducing the friction loss particularly at a low temperature condition in which the oil viscosity is high is remarkable.
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