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STD5M-HF

CONTI® SYNCHRODRIVE polyurethane timing belt (open length)

1. Tooth shear strength

specific tooth force

Rotational speed n [rpm] Ftspez [N/cm] Rotational speed n [rpm] Ftspez [N/cm]
0 35,280 1900 20,049
20 34,695 2000 19,739
40 34,157 2200 19,159
60 33,659 2400 18,625
80 33,195 2600 18,131
100 32,761 2800 17,670
150 31,785 3000 17,239
200 30,933 3200 16,834
300 29,497 3400 16,452
400 28,314 3600 16,090
500 27,309 3800 15,747
600 26,435 4000 15,421
700 25,661 4500 14,668
800 24,968 5000 13,991
900 24,339 5500 13,376
1000 23,764 6000 12,813
1100 23,234 6500 12,293
1200 22,743 7000 11,811
1300 22,286 7500 11,360
1400 21,857 8000 10,938
1500 21,455 8500 10,542
1600 21,075 9000 10,167
1700 20,715 9500 9,812
1800 20,374 10000 9,474

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.

Ft = Ftspez * ze * b

Ft = Tangential force
Ftspez = Specific tooth force in N/cm
b = Belt width in cm
ze = Number of meshing teeth
zemax = 12

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

Permitted tensile load of the belt

Belt width b [mm] 5 10 15 25 50
STD5M-HF 150 300 450 750 1500
STD5M-HP 325 650 975 1625 3250
STD5M-HS 600 1200 1800 3000 6000

Specific elasticity Cspez [N]:

Example: 10[6] = 106

Belt width b [mm] 5 10 15 25 50
STD5M-HF 3,75*10[4] 7,5*10[4] 1,125*10[5] 1,875*10[5] 3,75*10[5]
STD5M-HP 1,0*10[5] 2,0*10[5] 3,0*10[5] 5,0*10[5] 1,0*10[6]
STD5M-HS 1,75*10[5] 3,5*10[5] 5,25*10[5] 8,75*10[5] 1,75*10[6]

Belt weights [kg/m]:

Belt width b [mm] 5 10 15 25 50
STD5M-HF 0,01605 0,0321 0,04815 0,08025 0,1605
STD5M-HP 0,01955 0,0391 0,05865 0,09775 0,1955
STD5M-HS 0,0232 0,0464 0,0696 0,116 0,232

3. Flexibility

Minimum number of teeth, minimum diameter

( X ) without contraflexure
( X X ) with contraflexure
Belt type Number of teeth zmin ( X ) Tension roller dmin [mm] ( X ) Tension roller dmin [mm] ( X X )
STD5M-HF 12 19,1 30
STD5M-HP 16 25,46 50
STD5M-HS 24 38,2 80