1994-03-01

A Study on a Metal Pushing V-Belt Type CVT (Part 3: What Forces Act on Metal Blocks?) 940735

Block compression force and ring tension of a metal pushing V-belt type CVT have been experimentally measured at steady states. The peculiar transmitting mechanisms for this type of belts has also been outlined based on the experimental results in the previous works.
In this paper, other forces simultaneously acting on a block at steady states were measured using newly developed devised blocks. These forces are frictional force between blocks and rings, normal force between blocks and pulleys, frictional forces between blocks and pulleys in radial and tangential directions. The transmitting mechanisms for the metal pushing V-belt type CVT were drawn in detail based on new experimental data. The following conclusions are emphasized in the present work.
  1. (1)
    A cohesive point where the block coheres with the ring exists in the pulley having a larger pitch radius at all conditions. This is not dependent on speed ratio and transmitting torque. The all blocks run faster than rings in the smaller pulley. This fact governs the ring tension.
  2. (2)
    The phenomenon that the block compression force once increases in the driven pulley is due to penetration of blocks into the pulley groove.
  3. (3)
    The radial frictional force becomes extremely large at the exit of the larger pulley since the normal force acting on the side surface of the block becomes large there.

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