This bodes well for rotary engine Turbo Compound use as we
are asking both high speed and high HP transmission from
the V Ribbed belt.
http://www.machinedesign.com/BDE/mechanical/bdemech1/bdemech1_15.html
"V-ribbed belts
The V-ribbed concept combines some of the best features of flat belts and V-belts. It employs what
is essentially a flat belt with a series of V-shaped ribs running the length of the belt on the
driving surface. These thin belts operate efficiently and can run at high speed. But even more
important, tensile cords have total support because the belt ribs bottom completely on the sheave;
there is no wedging action. The total support of the cord permits high load-carrying capacity.
Theoretically, this design could provide the highest capacity of any belt if reinforced with
high-strength fiber. To date, however, there has been no commercial demand for such exceptional
power capacity in this type of belt."
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That is up until the Turbo Compound rotary appeared.
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"The sacrifice of wedging action in V-ribbed belts increases tensioning requirements, but not to the
levels required by flat belts. Supposedly, friction is independent of area of contact. Nevertheless,
the V-ribbed shape increases friction between belt and sheave considerably beyond that of flat
belts. Consequently, tensioning requirements are only about 20% above those of V-belts. In addition,
the ribs ensure that belts track properly, making alignment less critical than it is for flat belts.
Flat-belt alignment requirements are more critical than those of V-belts.
Major applications of the V-ribbed belts are in mass-produced consumer goods such as snow blowers,
home power tools, and clothes dryers. It is also on accessory drives in automobiles. Operating
efficiency of the V-ribbed belts rivals that of flat belts and synchronous belts. It also is able to
operate over small pulleys. Because it is available in small width increments of one-rib width,
belts can be matched almost precisely to the power requirements of specific drives. V-ribbed belts
are not recommended for clutching drives.
The belt performs well with reverse-bend idlers, and most applications involve high-speed ratios
with a reverse-bend idler used for take-up and to increase the arc of wrap on the smaller pulley.
Five standard configurations are available, with designations of H, J, K, L, and M. L and M were the
first to be introduced and are intended primarily for industrial and agricultural drives. The M
section is capable of transmitting up to 1,000 hp. J (originally called JR) is normally applied to
fractional-horsepower drives in home appliances, snow blowers, and power tools. H is intended for
miniature drives and K for automotive accessory drives.
The V-ribbed section, because it is available in extremely high-power ratings, eliminates
matched-set belts required in multiple V-belt drives. The power density also permits compact drive
configurations.
The most effective use of V-ribbed belts normally requires testing the drive system. Some tooling
investment may be necessary for pulleys. The user also may find it prudent to draw upon the belt
manufacturer for technical help and design refinement. Therefore, the V-ribbed concept is almost
always applied to mass-produced drives."
BTW looks like a pretty good belt drive PSRU could be designed around
these V-Ribbed belts.
Paul Lamar ...No rotor no motor.
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