V-belt pulley

from Wikipedia, the free encyclopedia
V-belt pulley with taper clamping bush

As V-belt pulley is defined as the machine element having a shaft with another shaft by means of a V-belt connects. It is therefore an essential part of a V-belt drive.

In common parlance, this washer is often referred to as a 'pulley' or 'wedge washer'.

It is mainly made of GG 20 cast iron . But there are also V-belt pulleys

  • aluminum
  • Aluminum / cast iron (so-called bimetal discs, i.e. a disc made of aluminum with a hub made of cast iron)
  • plastic

They are available as

  • Solid disc (usually only common with small, single-groove discs → hub - groove profile connection is full surface)
  • Bottom washer (hub is connected to the grooved profile by means of a washer → similar to a steel car rim)
  • Arm disk (hub is connected to the groove profile by means of webs → see figure on the right).

The latter is the most common because it has advantages in terms of the use of materials and the moving mass.

The hub is provided with either one

  • Centering (pilot hole)
  • Finish bore (tolerance: H7)
  • Finish bore with feather keyway or
  • Bore for a taper clamping bush (attention: concentricity and balancing are no longer perfect!).

The taper clamping bush is becoming more and more popular because it makes finish drilling and grooving superfluous and is very easy to assemble. This makes it more economical despite the higher purchase price. For this purpose, the V-belt pulleys are given a hole in which the already drilled clamping bush is inserted. The bushing is fixed in the disc with 2 screws and clamped onto the shaft at the same time. A groove (feather key connection) is only necessary for extreme loads.

In order to avoid an imbalance , the disks are normally balanced in one plane (quality level G 16), unless the drive reaches a speed of more than 30 m / s.

For reasons of economy and belt service life, the minimum pulley diameter (see below) should not be undercut.

Used standards : ISO 4183, DIN 2211/2215/2217/2218

Profiles used: 5/6/8/10 (SPZ) / 13 (SPA) / 17 (SPB) / 20/22 (SPC) / 25/32/40, with 10, 13 and 17 being the most common. The same V-belt pulleys are used for classic V-belts and narrow V-belts.

See also

Web links

  • Conversion table for minimum diameter and conversion from Ld to La
  • V-belt calculation Helpful calculation to equip existing V-belt pulleys with suitable V-belts