Belt Pulleys – SEILEREI PFLUG

In our in-house machine shop, we manufacture pulleys as standard pulleys or according to customer drawings from aluminium, steel, stainless steel, polyamide and POM.

plastic_belt-pulleys — Plastic pulleys made of polyamide & POM

metal_belt-pulleys — Plastic pulleys made of polyamide & POM

Profiles and Extras

We manufacture pulleys with a wide variety of groove profiles. They are available either as blanks or fully machined with bore, keyway and set screw.

belt-pulley_profil-1-cut — **Profile 1**: Primarily used for **high-speed** drives, **idler pulleys** and **support pulleys**.
b1 = Ø + 55.6%
b2 = 2 × Ø
h = 80% of Ø
r1 = ½ Ø
r2 = ½ Ø + 10%
d = pulley Ø

belt-pulley_profil-2-cut — **Profile 1**: Primarily used for **high-speed** drives, **idler pulleys** and **support pulleys**.
b1 = Ø + 55.6%
b2 = 2 × Ø
h = 80% of Ø
r1 = ½ Ø
r2 = ½ Ø + 10%
d = pulley Ø

Belt Profiles and Structures

Order designation	P1	P2
Drive	PUR round belts	Elastic round belts (low-speed)
	Elastic round belts (high-speed)	Plaited round belts (low-speed)
	Plaited round belts	Twisted round belts (low-speed)
	Twisted round belts (high-speed)
	Injected round belts
Conveying	PUR round belts	Elastic round belts
	Elastic round belts	Plaited round belts
	Plaited round belts	Twisted round belts
	Twisted round belts	(reducing h2 is recommended)
	Injected round belts

^*When selecting the pulley profiles, please refer to the specifications in the data sheets for the respective belt types, as different recommendations may apply depending on the materials used.

*When selecting the pulley profiles, please refer to the specifications in the data sheets for the respective belt types, as different recommendations may apply depending on the materials used.

Our pulleys are supplied as follows:

20–50 mm Ø with 10 mm hub on one side, pre-bored to 5 mm
50–100 mm Ø with 10 mm hub on one side, pre-bored to 6 mm
100–150 mm Ø with 15 mm hub on one side, pre-bored to 8 mm
150–250 mm Ø with 15 mm hub on one side, pre-bored to 12 mm
250–350 mm Ø with 20 mm hub on one side, pre-bored to 15 mm

We can supply the pulleys either as blanks or fully machined with bore, keyway and set screw.

Our machinery also allows us to machine pulleys with diameters of up to 650 mm.

Crown Shapes of Flat Belt Pulleys

As a general rule, pulleys should be manufactured in accordance with the applicable DIN or ISO standard. The corresponding crowned pulley profiles are standardized according to DIN 111 and ISO 100.

belt-pulley_crowned_rim_profile-1 — Figure 1: slightly crowned pulley face
Order designation: SBK

belt-pulley_crowned_rim_profile-2 — Figure 1: slightly crowned pulley face
Order designation: SBK

The pulley surface should have a roughness of Rz 25 according to DIN 4768 in order to achieve good friction characteristics between the flat belt and pulley.

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