VTP - High Speed V-Belt Pulleys
VTP high-speed V-belt pulleys in SPZ, SPA, SPB and SPC profiles are a special type of V-belt pulleys. They are made of cast steel GGG 50 and compared to conventional pulleys made of gray cast iron, they have significantly better properties: higher strength and resistance, lower weight and higher peripheral speed.
The pulleys are mounted to the shafts using Taper Lock cone bushings.
Typical Applications
The VTP® V-belt pulleys are designed for the highest peripheral speeds in all areas of engineering, especially for applications with high temperature, alternating and impact load, and wherever the conventional cast iron V-belt pulleys cannot be used.
They are typically used in compressors, blowers, machine tools, in the paper and chemical industry and in many other machines.
Properties
- Up to 50% lower weight
- Increased peripheral speed up to 60 m/s (theoretically up to 100 m/s)
- Lower moments of innertia
- Longer V-belt life-span
- Made of cast iron quality GGG 50 of higher strenght
- New CDP (KTL) coating improves rust protection
- Decreased temperature of the belts - up to 17 °C
Materials
Cast iron GGG60.
Key Features
Decreased temperature of the belts up to 17 °C
A study demonstrates reduction of temperature of belts in VTP® pulleys up to 10 to 17 °C against standard pulleys. The pulleys have a perforated bottom groove and the heat is drained off the belt better during operation. Punching does not affect the pulley strength.
The tests show that the belts after 2 hours of operation of the VTP® SPB250-4 pulley have a temperature more than 10 °C lower that the standard SPB250-4 pulley.
Pulley Code Description
Example:
SPB 630/4 VTP TB 3525
| Code Part | Description |
|---|---|
| SPB |
Profile |
| 630 |
Nominal diameter of pulley in mm |
| 4 |
Number of grooves |
| VTP |
Ventilated Turbo Pulley high speed |
| TB |
Taper bush |
| 3525 |
Type of Taper busch |
Profile and Dimensions
| Profile | Dm [mm] |
α [°] |
B1 [mm] |
Bm [mm] |
E [mm] |
F [mm] |
C [mm] |
T [mm] |
|---|---|---|---|---|---|---|---|---|
| SPZ | (≤80) >80 | (38) 34 | 9.7 | 8.5 | 12.0 | 8 | 2.0 | 11.0 |
| SPA | (≤118) >118 | (38) 34 | 12.7 | 11.0 | 15.0 | 10 | 2.8 | 13.8 |
| SPB | (≤190) >190 | (38) 34 | 16.3 | 14.0 | 19.0 | 12 | 3.5 | 17.5 |
| SPC | (≤315) >315 | (38) 34 | 22.0 | 19.0 | 25.5 | 17 | 4.8 | 23.8 |
Crown width \(B\): \[B = {E^{(n-1)} + 2 \cdot F}\ {[mm]}\] where \(n\) is the number of grooves.
Other technical data for particular groove dimensions are to be found in the technical documentation.
Documents for Download
Dimensions and Parameters of VTP V-Belt Pulleys
TYMA CZ Data Sheets
Czech and English (PDF 2.05 MB)
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