Belt Drive

Deterministic engineering intelligence platform for mechanical, structural, and electrical designers. 91 modules validated solvers, 3D CAD workspace, and ISO/DIN standards compliance.

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▸Formula · assumptions · example(ISO 5291 · DIN 2215 / DIN 7753 · RMA IP-20)

Formula

P_{\text{corr}} = P_{\text{rated}} \cdot c_1 \cdot c_3, \quad L_p = 2C + 1.57(d_2 + d_1) + \frac{(d_2 - d_1)^2}{4C}

ISO 5291 industrial V-belt & pulley power transmission, arc of contact correction c1, service factor c3, and pitch length calculation.

Assumptions

  • · Small pulley diameter d1 exceeds minimum recommended bending limit to avoid premature fatigue
  • · Wrap angle on small pulley θ1 ≥ 120° for optimal frictional torque transmission
  • · Installation and operational belt tension calibrated to prevent slippage without overloading shaft bearings

Worked example

Worked example — SPA Profile V-Belt (d1 = 100 mm, d2 = 200 mm, C = 450 mm, Power = 5.5 kW)

Calculates pitch length Lp = 1382 mm (standard SPA 1400), arc of contact θ1 = 167.2° (c1 = 0.97), recommending 2 parallel belts for safety factor 1.45.