Technical data STD3M

1. Tooth shear strength

specific tooth force

Rotational speed n [rpm] Ftspez [N/cm] Rotational speed n [rpm] Ftspez [N/cm]
0 29,400 1900 17,991
20 29,016 2000 17,742
40 28,658 2200 17,275
60 28,321 2400 16,843
80 28,003 2600 16,443
100 27,702 2800 16,070
150 27,015 3000 15,720
200 26,404 3200 15,391
300 25,352 3400 15,081
400 24,468 3600 14,787
500 23,705 3800 14,507
600 23,034 4000 14,241
700 22,436 4500 13,627
800 21,896 5000 13,074
900 21,404 5500 12,571
1000 20,951 6000 12,110
1100 20,533 6500 11,684
1200 20,144 7000 11,288
1300 19,781 7500 10,919
1400 19,440 8000 10,573
1500 19,118 8500 10,247
1600 18,814 9000 9,939
1700 18,526 9500 9,647
1800 18,252 10000 9,370

The specific tooth force Ftspez is the maximum force N a belt tooth with a width of 1 cm can transmit. This value depends on the rotational speed of the drive pulley. The calculation takes into account each identical carrying values for each meshing tooth. With more than 12 meshing teeth ze is limited to 12.

\begin{align}
F_t&= {F_{tspez} \cdot z_e \cdot b}\\
F_t& = {\text{Tangential force}}\\
F_{tspez}&= {\text{Specific tooth force in N/cm}}\\
b& = \text{Belt width in cm} \\
z_e&= \text{Number of meshing teeth}\\
z_{emax}&= 12
\end{align}

2. Tension cord strength (M) Ftzul [N] (open length)

permitted tensile force of the belt cross-section

Belt width b [mm] 5 10 15 25 50
STD3M-HP 150 300 450 750 1500

Specific elasticity Cspez [N]:

Bsp: 10[6] = 106

Belt width b [mm] 5 10 15 25 50
STD3M-HP 3,75*10[4] 7,5*10[4] 1,125*10[5] 1,875*10[5] 3,75*10[5]

Belt weights [kg/m]:

Belt width b [mm] 5 10 15 25 50
STD3M-HP 0,0154 0,0308 0,0462 0,077 0,154

3. Flexibility

Minimum number of teeth, minimum diameter

 

( X ) without contraflexure

 

 

( X X ) with contraflexure

 

Belt type Number of teeth Tension roller Tension roller
  zmin (X) dmin [mm] (X) dmin [mm] (XX)
STD3M-HP 20 19,1 30