V-belt Pulley (V-belt Sheave)

V-belt pulley (also called V-belt Sheave) is a belt pulley structure consisting of rim, spokes and hub. V-belt pulleys are commonly used in gray cast iron, steel, aluminum alloy or engineering plastics, etc., among which gray cast iron is the most widely used material.

Advantages of V-Belt Pulley

1. Convenient to transport and handle
2. High strength
3. Corrosion resistance
4. Easy to install
5. long lifespan
6. low cost
7. OEM/ODM welcome

Material of V Groove Belt Pulleys

The material of the V belt pulleys is mostly gray cast iron, generally HT150 or HT200, but also steel or non-metallic materials (plastic, wood) can be used. The maximum permissible circumferential speed of cast iron pulley is 25m/s, and when the speed is higher, it can be made of cast steel or steel plate stamping. Plastic pulleys are light in weight and have a high coefficient of friction and are commonly used in machine tools.

V-belt Pulley Specifications

The following factors are crucial when choosing a V belt pulley.

• The belt profile, or the style and size of the belt being integrated.
• The outer diameter, or the distance through the pulley when measured between the edges of the grooves.
• The center diameter is the distance or distances between the pulley shafts in the drive. V-belt drives are limited by a center distance that must not exceed three times the maximum pulley diameter to avoid significant slippage.
• Groove, a groove located in the pulley. It includes the angle, number and the width of the flange.
• Pitch circle diameter, or the diameter of the pulley where the belt engages, is critical to the strength-to-weight ratio of the drive.
• Contact arc, the degree to which the belt wraps around the pulley.

The condition and alignment of your v-belt sheaves is a critical factor in belt life and performance. Misaligned sheaves pull down the efficiency of a drive by 8% and accelerate belt wear. Sheave grooves can also wear prematurely from belt tensioning, drive misalignment, and harsh environmental conditions. A worn sheave groove can cause a v-belt to slip and vibrate which may lead to damage or loss of belt.

To inspect a sheave, insert the correct size gauge into the sheave groove. The gauge should fit squarely and not have daylight around the edges. If the gauge does not fit, the sheave is worn and must be replaced.

Mounting of V Belt Sheaves

First, the bore of the v-belt sheaves must be geometrically matched to the mating shaft. The axis around which the pulley rotates is the shaft, and the most common way to accommodate that shaft is to use a simple bore that instead allows the pulley to rotate freely around the shaft without transmitting torque. This bore is used for idler applications, but is otherwise useless for power transmission. Other mounting methods include:

• Set Screw: Through hole allows the screw to be tightened vertically on the shaft.
• Keyway: Offset slots or shafts ensure a tight fit along the shaft to transfer torque between components.
• Press-in: Offset slots or shafts ensure a tight fit along the axle to transfer torque between components.
• Welded: The hub of the pulley is attached directly to the axle by welding.
• Tapered Bushing: A bolt-on tapered hub locks around the axle.
• Clamped hub: A split hub is tightened around the axle using a clamp.

V Belt Sheave Design

(1) The v belt pulley shall have sufficient strength and rigidity without excessive casting internal stress.

(2) The design of v-belt pulley shall be small in mass and uniform in distribution, with good structure and technology, and easy to manufacture.

(3) Dynamic balancing shall be carried out at high speed.

(4) The working surface of the wheel groove shall be smooth to reduce the wear of the belt.

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