Timing Belt Tooth Profile and Pitch

As a high-precision transmission component, timing belt is widely used in various industrial and automation equipment. The tooth profile and pitch of synchronous belt are two key parameters in the design and application of timing belt. Different tooth profile and pitch apply to different working conditions and load requirements.

Timing Belt Tooth Profile

Timing belt tooth profile refers to the shape of the belt tooth. There are three regular tooth profile:

• Trapezoidal: It is common timing belt tooth profile, the shape is trapezoidal. It mainly includes T, AT, L, XL, MXL, H, XH, XXH and so on. Trapezoidal teeth have good load capacity, but under high speed operation, the transmission accuracy is low and the noise is large.
• Circular: Modern toothed belt widely used tooth shape, its tooth shape is circular arc, which has features of higher transmission accuracy, less noise and it is suitable for high-speed and high-precision occasions. Typical models are HTD (High Torque Drive) and STD (Super Torque Drive) and so on.
• Special Tooth Shapes: Some timing belt have special tooth shapes to meet specific needs, such as semi-circular or deformed teeth, which are usually specially used for applications with high loads, high precision or special environments.

Timing Belt Pitch

Timing belt pitch refers to the distance between the center lines of two adjacent teeth, which is an important parameter in the design of the toothed belt. Pitch directly affects the matching of synchronous belt with pulley, as well as the selection of the number of teeth and pulley diameter.

Metric pitch: The general timing belt pitch has 2mm, 3mm, 5mm, 8mm, 10mm, 14mm, etc., suitable for different load and transmission requirements. For example, STD5M toothed belt has a pitch of 5mm.

Inch pitch: Regular inch pitch timing belts include MXL (0.08 inches), XL (0.2 inches), L (0.375 inches), H (0.5 inches), and so on. These pitches are mainly used in early design industrial equipment.

Summarization

The tooth shape of the timing belt determines its transmission performance, accuracy and noise level, while the belt pitch determines the choice of pulley and the accuracy of the transmission ratio. According to the different application environment, choosing the appropriate tooth shape and pitch can ensure the efficient and stable operation of the synchronous belt.