Technical data T7/8"

1. Tooth shear strength

specific tooth force

Rotational speed n [rpm] Ftspez [N/cm] Rotational speed n [rpm] Ftspez [N/cm]
0 91,35 1600 44,28
20 88,29 1700 43,38
40 85,77 1800 42,48
60 83,52 1900 41,58
80 81,63 2000 40,77
100 79,83 2200 39,24
200 73,08 2400 37,89
300 68,31 2600 36,63
400 64,62 2800 35,46
500 61,56 3000 34,29
600 59,04 3200 33,3
700 56,79 3400 32,31
800 54,81 3600 31,41
900 53,1 3800 30,51
1000 51,48 4000 29,7
1100 50,04 4500 27,72
1200 48,78 5000 26,01
1300 47,52 5500 24,48
1400 46,35 6000 23,04
1500 45,27 6500 21,78

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] 38,1 50,8 76,2 101,6
BRECO T 7/8´´ 5250 7000 10500 14000

Specific elasticity Cspez [N]:

Bsp: 10[6] = 106

Belt width b [mm] 38,1 50,8 76,2 101,6
BRECO T 7/8´´ 1,31*10[6] 1,75*10[6] 2,63*10[6] 3,50*10[6]

Belt weights [kg/m]:

Belt width b [mm] 38,1 50,8 76,2 101,6
BRECO T 7/8´´ 0,397 0,530 0,795 1,059

3. Flexibility

Minimum number of teeth, minimum diameter

 

( X ) without contraflexure

 

 

( X X ) with contraflexure

 

Belt type Number of teeth Tension roller Number of teeth Tension roller
  zmin (X) dmin [mm] (X) zmin (XX) dmin [mm] (XX)
BRECO T 7/8´´ 18 150 20 180