How do I calculate timing belt length in teeth?

Belt length L = 2C + π(d1+d2)/2 + (d2−d1)²/(4C) where d = z×p/π (pitch diameter from teeth×pitch). Number of belt teeth = L/pitch, rounded to nearest standard belt size.

What is the difference between HTD and GT profiles?

HTD (High Torque Drive) uses a curvilinear tooth profile. GT (Gates Tooth, e.g., GT2, GT3, GT5) is an improved profile with a modified curvilinear shape, providing better load distribution, reduced backlash, and higher power capacity than HTD.

How do I select the right timing belt pitch?

Pitch selection depends on power and speed: GT2 (2mm) for light duty/3D printers, HTD-3M/GT3 for small drives up to ~5kW, HTD-5M/GT5 for medium 2-30 kW, HTD-8M for 10-100 kW, HTD-14M for 50-250+ kW.

What is the minimum number of teeth on a timing pulley?

Minimum pulley teeth depend on pitch: GT2/3M: 12 teeth, 5M: 14 teeth, 8M: 22 teeth, 14M: 28 teeth. Using fewer teeth increases belt bending stress and reduces belt life.

Can I adjust center distance for timing belts?

Timing belts are not elastic like V-belts, so center distance must match the belt length exactly. Use a tensioner idler or select pulleys and belt length that give the desired center distance. Belt manufacturers provide tables of standard belt lengths.

免費工程工具 #089

同步皮帶計算器

計算同步皮帶的節距長度與齒數。支援 HTD 3/5/8/14 與 GT2/GT3/GT5 剖面。輸入皮輪齒數、中心距與節距。

HTD 3/5/8/14 GT2/GT3/GT5 同步

結果

皮帶長度（齒數）

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皮帶長度（mm）

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傳動比

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節圓直徑 (d₁ / d₂)

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實際中心距

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節圓直徑

皮帶長度（齒數）

同步皮帶節距選擇

節距	輪廓	功率範圍	最小皮輪齒數
2 mm	GT2	輕載，3D 印表機	12
3 mm	HTD-3M / GT3	最高 5 kW	12
5 mm	HTD-5M / GT5	2 – 30 kW	14
8 mm	HTD-8M	10 – 100 kW	22
14 mm	HTD-14M	50 – 250+ kW	28

範例 — HTD-5M 皮帶

已知： z₁=20, z₂=60, pitch=5 mm, C=200 mm

d₁ = 20×5/π = 31.83 mm, d₂ = 60×5/π = 95.49 mm

L_mm = 2×200 + π(31.83+95.49)/2 + (95.49-31.83)²/(4×200) = 400 + 200.0 + 5.1 = 605.1 mm

皮帶齒數 = 605.1/5 = 121.0 → 最接近的整數齒： 121 齒（605 mm 皮帶） — 查閱製造商型錄以確認最接近的可用標準長度，然後重新校核實際中心距