386 TECHNICAL INFORMATION Q Allowable Tension Table 10: Joint Processed Belt (Iron Rubber®) Allowable Tension Unit: N Type of Belt Belt Width 025 037 050 075 100 150 200 XL 90 135 175 − − − − L − − 320 480 640 − − H − − − 480 640 960 1280 Unit: N Type of Belt Belt Width 100 150 200 250 400 500 T5 150 200 270 350 − − T10 − 320 440 640 960 1280 AT5 210 350 − − − − AT10 − 890 890 1070 − − Table 11: Open End Belt (Iron Rubber®) Allowable Tension Unit: N Type of Belt Belt Width 025 037 050 075 100 150 200 XL 180 270 350 − − − − L − − 640 960 1280 − − H − − − 960 1280 1920 2560 Unit: N Type of Belt Belt Width 070 100 150 200 250 400 500 MA3 200 300 400 − − − − MA5 − 470 740 960 − − − MA8 − − 1620 2160 2700 − − T5 200 300 400 550 700 − − T10 − − 640 880 1280 1920 2560 AT5 − 470 740 − − − − AT10 − − 1620 2160 2700 − − Q Initial Tension Setup Determine the Initial Tension based on the maximum tension that occurs during operation. Initial tension is equal throughout the entire belt loop during non-running or idling states. There are Tension and Slack sides on belts during operation. The differential of the tension is called Effective Tension. This differential via the pulleys generates torque or transmission capacity. For toothed belt applications, apply initial tension not to cause belt sags on the Slack side. When a sag is evident during the start-up, it indicates that the initial tension is insufficient. U = 2 × 103 × Md dp Or U = 19.1 × 106 ×P n × dp Elasticity Guideline 0.5U Fv 0.5F + 0.2F U: Effective Tension (N) Md: Load Torque (Nm) P: Transmission Capacity (kW) dp: Pulley Diameter (mm) n: Pulley Rotational Speed (rpm) Fv: Initial Tension (N) F: Allowable Tension (N) Q Method for Checking Initial Tension t .FUIPE CZ $IFDLJOH #FMU &MPOHBUJPO Belt elongation (guideline) at Allowable Tension F, Joint Process 0.2% = 2mm/m Open End 0.4% = 4mm/m t .FUIPE 6TJOH #FMU 7JCSBUJPOT Fv = 4×f2×m×ℓ2 Fv: Belt Tension (N) f: Vibration Frequency (Hz) m: Belt Weight Per 1m (kg/m) ℓ: Span Length (m) L ˚耥 Fv Fv Pk Ў L t .FUIPE 6TJOH %FGMFDUJPO 'PSDF BOE %FGMFDUJPO "NPVOU The relationship between force and elongation follows Hooke's Law (In proportional relationship), and the intermediate value can be obtained by calculations. Pk = Fv/16 Adjust in such a way that deflection meets the following criteria: [ =L/64] Pk: Deflection Force (N) Fv: Desired Tension (N) : Deflection Amount (mm) L: Span Length (mm) However, if the value resulting from the calculation, "0.5U + 0.2F," exceeds 0.5F, regard "0.5F" as the maximum value. Timing Belt Selection of Synchronous Belt 3
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