The trapezoidal tooth synchronous belt determines the pulley pitch based on the imperial system (inches). It is divided into straight-edge tooth profile tooth form and involute tooth profile tooth form. Among them, straight-edge tooth profile tooth form is more common. In addition to the advantages of general synchronous belt transmission, the trapezoidal toothed synchronous belt has the characteristics of a square tooth shape. Compared with the arc-toothed pulley, it can allow a larger linear speed, that is to say, the circumferential trapezoidal type The toothed synchronous belt can meet the requirements of higher speed transmission. Ladder tooth synchronous belt models include MXL, XL, L, H, XH, and XXH.
The most common materials for ladder-type toothed synchronous belts are rubber and polyurethane (PU). The frame is usually made of fiberglass cords or steel wires. The specific material selection is based on the needs of the user.
- Drawing of trapezoidal tooth timing belt:
- Interpretation of trapezoidal tooth timing belt codes:
- Tooth dimensions of standard synchronous belt with trapezoidal teeth (extracted from GB/T 11616-2013):
| Profile① | Pitch Pb | Tooth profile angle 2β° | Tooth root thickness s | Tooth height ht | Belt high②hs | Tooth root fillet radius rr | Tooth tip fillet radius ra |
|---|---|---|---|---|---|---|---|
| MXL | 2.032 | 40 | 1.14 | 0.51 | 1.14 | 0.13 | 0.13 |
| XXL | 3.175 | 50 | 1.73 | 0.76 | 1.52 | 0.2 | 0.3 |
| XL | 5.08 | 50 | 2.57 | 1.27 | 2.3 | 0.38 | 0.38 |
| L | 9.525 | 40 | 4.65 | 1.91 | 3.6 | 0.51 | 0.51 |
| H | 12.7 | 40 | 6.12 | 2.29 | 4.3 | 1.02 | 1.02 |
| XH | 22.225 | 40 | 12.57 | 6.35 | 11.2 | 1.57 | 1.19 |
| XXH | 31.75 | 40 | 19.05 | 9.53 | 15.7 | 2.29 | 1.52 |
Note: The unit of this table is mm.
①The belt type is the pitch code, MXL──the lightest; XXL──ultra light; XL──extra light; L──light; H──heavy; XH──extra heavy; XXH──super heavy.
②The belt height is the single-sided belt.
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