How do I select the right V-belt cross-section?

V-belt cross-section is selected based on design power (power × service factor) and the speed of the faster shaft. Use selection charts: Z/SPZ for up to ~4 kW, A/SPA for ~2-20 kW, B/SPB for ~5-60 kW, C/SPC for ~15-150 kW, D for ~50-500 kW.

What is the difference between classical and narrow V-belts?

Classical V-belts (Z, A, B, C, D) have a wider profile. Narrow V-belts (SPZ, SPA, SPB, SPC) transmit more power per belt and per unit width. Narrow belts are preferred for new designs due to higher power density and efficiency.

How do I calculate the number of belts needed?

Number of belts = Design Power / (Power per belt × Correction factors). Correction factors include wrap angle factor (C1), belt length factor (C3), and number-of-belts factor. Round up to the nearest whole number.

What service factors apply to V-belt drives?

Service factors for V-belts: 1.0-1.2 for uniform loads (fans, pumps), 1.1-1.3 for light shocks, 1.2-1.4 for moderate shocks, 1.3-1.8 for heavy shocks. Multiply by 1.2 for more than 10 hours/day operation.

What is the maximum recommended V-belt speed?

Maximum recommended belt speed: 25-30 m/s for classical V-belts, up to 40 m/s for narrow V-belts. Above these speeds, centrifugal forces significantly reduce belt capacity and special high-speed belts should be used.

Free Engineering Tool #088

व्ही-बेल्ट निवड कॅल्क्युलेटर

Select V-belt cross-section and calculate the number of belts needed. Belt profiles per ISO 4184; power ratings based on typical manufacturer catalogue data. Enter power, speed, service factor, and pulley diameter.

ISO 4184 profiles Z/A/B/C/D SPZ/SPA/SPB/SPC

शक्ती (kW)

जास्त वेगाचा शाफ्ट वेग (RPM)

सेवा गुणांक

लहान पुली व्यास (mm)

बेल्ट प्रोफाइल

गती गुणोत्तर (D₂/D₁)

Quick presets

Results

आवश्यक बेल्टांची संख्या

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डिझाइन power (P_d)

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प्रति बेल्ट power (P_b)

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शिफारस केलेले प्रोफाइल

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बेल्ट गती

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डिझाइन शक्ती

बेल्टची संख्या

इथे C₁ हा wrap angle factor आहे, C₃ हा belt length factor आहे, आणि P_b हा प्रति बेल्टचा मूलभूत power rating आहे.

V-Belt cross-section निवड मार्गदर्शक

प्रोफाइल	प्रकार	वरची रुंदी	पॉवर श्रेणी (सामान्य)	किमान पुली ⌀
Z	पारंपरिक	10 mm	0.2 – 4 kW	50 mm
A	पारंपरिक	13 mm	0.5 – 15 kW	75 mm
B	पारंपरिक	17 mm	2 – 55 kW	125 mm
C	पारंपरिक	22 mm	10 – 150 kW	200 mm
D	पारंपरिक	32 mm	40 – 500 kW	355 mm
SPZ	अरुंद	9.7 mm	0.5 – 8 kW	63 mm
SPA	अरुंद	12.7 mm	1.5 – 30 kW	90 mm
SPB	अरुंद	16.3 mm	5 – 80 kW	140 mm
SPC	अरुंद	22 mm	20 – 250 kW	224 mm

टिप: अरुंद V-belts (SPZ, SPA, SPB, SPC) पारंपरिक sections पेक्षा प्रति बेल्ट 30–50% अधिक power capacity देतात आणि नवीन डिझाइन्ससाठी शिफारस केल्या जातात.

V-Belt Selection Calculator | ISO 5288 | Free Online Tool

Published by Nikolai Shelkovenko on फेब्रुवारी 15, 2026 जुलै 2, 2026

Results

डिझाइन शक्ती

बेल्टची संख्या

V-Belt cross-section निवड मार्गदर्शक

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