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What is variable pitch sheave?

What is variable pitch sheave?

The principle of a variable pitch sheave is that the threaded angular faced discs forming the V-shaped groove, in which the belt rides, are movable. When the discs are moved toward each other, the belt rides higher in the groove and the pitch diameter of the sheave is larger, which increases the driven speed.

How does a variable speed sheave work?

Fixed shaft center distance: A variable speed pulley is mounted on the drive and driven shafts. As the driven pulley is opened, the driven pulley will decrease in speed and the opposite, as the drive pulley is closed the driven pulley will increase in speed.

What is a fan sheave?

A sheave (/ʃiːv/) or pulley wheel is a grooved wheel often used for holding a belt, wire rope, or rope and incorporated into a pulley. This allows the wire or rope to move freely, minimizing friction and wear on the cable. Sheaves can be used to redirect a cable or rope, lift loads, and transmit power.

What is variable pitch pulley?

A Torque Transmission variable pitch pulley is an economical and lightweight pulley solution. Torque Transmission variable speed pulleys offer multiple pressure clamping force on the belt and are color-coded to indicate spring pressure for easy identification and use.

How do you adjust a variable speed pulley?

To increase blower speed, slightly loosen the setscrew that holds the pulley to the driveshaft. Move or turn the pulley clockwise on the shaft one turn, then tighten setscrew. If more speed is desired, turn the pulley clockwise two turns.

How do you remove a variable speed pulley?

How to Remove a Variable Speed Pulley

  1. Step One: Remove the Large Spring.
  2. Step Two: Remove the Small Tension Spring.
  3. Step Three: Remove the Upper Drive Belt.
  4. Step Four: Loosen and Remove the Pulley.
  5. Step Five: Inspect the Pulley.
  6. Step Six: Reinstall the Pulley.
  7. Step Seven: Reinstall the Cutting Deck.
  8. Step Eight: Test the Mower.

Is it a sheave or pulley?

A pulley is one of six types of simple machines. A sheave (pronounced “shiv”) is actually part of the pulley system. The sheave is the rotating, grooved wheel inside the pulley. This is the piece that the rope fits into.

How does changing pulley size affect speed?

By changing the diameter of the pulley wheels, speed can be changed. A smaller pulley turning a larger pulley results in the larger one moving more slowly but with more shaft power.

How does a variable pulley work?

The variable speed pulley is mounted on a sliding plate, which moves the pulley toward the engine or toward the transmission. As the pulley moves toward the engine, the transmission belt gets tighter. This forces the sliding plate in the variable pulley to squeeze the engine belt.