Calcolatrice Sollecitazione Linguetta Gratuita

Calcola la sollecitazione di taglio e di appoggio della linguetta.

N-m
mm
mm
mm
mm

Shear Stress on Key

20.8 MPa

Tangential Force on Key10,000 N
Bearing (Compressive) Stress62.5 MPa

Shear Stress on Key vs Transmitted Torque (T)

Vedi formula →

Formula

## Parallel Key Stress Analysis A key transmits torque between a shaft and a hub (gear, pulley, coupling). ### Formulas The tangential force at the shaft surface: **F = 2T / d** **Shear stress = F / (w x L)** (shear across the key width) **Bearing stress = F / ((h/2) x L)** (crushing on half the key height) where T is torque, d is shaft diameter, w is key width, h is key height, and L is key engagement length. Bearing stress is usually the governing criterion.

Esempio Risolto

A 12x8 mm key, 40 mm long, on a 40 mm shaft transmitting 200 N-m.

  1. 01F = 2 x 200,000 / 40 = 10,000 N
  2. 02Shear stress = 10,000 / (12 x 40) = 20.8 MPa
  3. 03Bearing stress = 10,000 / (4 x 40) = 62.5 MPa
  4. 04Bearing stress governs. For mild steel key (allowable bearing ~90 MPa), the key is adequate.