Imperial

*These classic trapezoidal teeth used in the US and Europe are the original timing belt tooth design. 

* The tooth profile is relatively low and a big surface area at the tip of the tooth providing good contacting area to transmission equipment.

* This thin and light design can be used in small diameter pulleys, i.e. tiny precision instrument.

Metric

*The tooth profiles of Metric and trapezoid are similar and used for conveying instrument.

*This type tooth profiles have a slightly deeper tooth engagement than imperial tooth. The tooth meshing is more securely, yet backslash can be slightly larger

*Used for conveying or low voltage applications and linear motion devices.

M Type

*Rounded teeth supply low backlash and wear, as well as good load distribution to ensure high performance, torque force and precision tooth meshing. The traits provide excellence in rotary and linear positioning, and power transmission applications.

*Deep tooth engagement causes slightly noise, but it provides greater transmission power.

*Small tooth pitches are applied for high torque conveying.

S Type

*In addition to excellent for linear positioning and power transmission, this type is similar to rounded tooth profile M type providing greater load distribution, low backlash and diminished wear and noise.

*Rounded tooth profile has deeper tooth meshing, and applied for precision positioning and power transmission applications.

*Small tooth pitches are applied for high torque conveying.

Super Torque AT Type

*These belts developed to allow higher load carrying capacity. Low backlash, stronger and firmer tooth make the belts perfect for linear positioning and motion control, yet may demand larger pulley radius.

*High stability and low extensibility reduce vibration and noise, and decrease polygon effect greatly.

Inter-Shaft Distance Tolerance

長度容許公差單位：mm

Length Tolerance

30

 High abrasion-resistant polyurethane (PU) is applied to situations with any wearing problem. After using and testing wear resistance, PU is higher than other materials. 

（Wear Condition: CS17 wheel，1000g/revolution，5000r/min，23℃）

The hardness range of PU is from10 Shore A to 80 Shore D, and the elongation is 400% to 800%. Nevertheless, the Shore hardness of rubber compounds is 60 A to 100 A, and the elongation is 550% at 70 Shore A.

Comparing PU with rubber at the same hardness, the former is equipped higher load capacity (including high elasticity, extensibility, heavy-duty, long lag-time, high damping-capacity). Therefore, the absorption of vibration and energy is superior during the stress-strain. Because of the high load capacity and excellent wear resistance, PU is widely used in gun carrier shock mounting, aircraft landing, automobile bumper, and industrial roller, etc.

In a general way, below 75 Shore A, all elastomer has the similar compressive deformation. However, PU still maintains the elasticity at 85 Shore A and above. This outstanding feature of PU highlights its high load support and good shock absorbed ability.

For vibration, PU is much lower than rubber used in industrial belt drive. In the manufacturing process, PU belt is liquid encapsulated compound in low pressure. Because of its monolithic trait, homogeneity is great. Thus, during the transmission, , PU belt causes low vibration and avoids moving the equipment.

The oil resistance of PU belts is superior to nitrile rubber. This trait can be used in high fuel-air hard environment, such as CNC transmission mechanism. Moreover, the property is better than nature rubber and other synthesized rubber, and can be used outdoors or in water. In terms of resistance of hydrolysis, acid, alkali solution, polyether type PU is superior to polyester type PU. Furthermore, the resistance of ozone and UV is used in aerospace industry.

PU materials satisfy small pulley transmission due to the features of good pliability and flexibility. 

Pressure measurement: Use pencil type belt tension meter or sling load to adjust belt tension to reach the standard. The benefit is low cost, while the drawback are long operating time and more measuring room required. The measuring methods are given below:

First, confirm that two timing belts are aligned correctly. Then, at the center of the span length (t), place a vertical deflection force (Td). The dimension (d) of the deflection force equals 1/64 of span length. For the deflection force, please check the type and width of belts from the following table. The following equation (A) is solved for the span length (t).

Composition—

Enhancing tear resistance 100%

Elastic cord

Ø  Constant tension, engineered to be applied for equipment with fixed center distances

Ø  Simple to be installed

 non-elastic tension cord

Ø  Low elongation and ideal for high horsepower and shock loads with changeable center distances

Made to order

1. According to the requirement

2. Inner idlers as flat idlers, suggesting inner idlers close to large pulleys

3. Outer idlers as flat idlers, suggesting outer idlers close to small pulleys

V-belt infor. as shown below(ISO9982)
1.Belt sizes and tolerances

Materials of belt pulley are cast iron, aluminum, steel or plastic. The surface roughness should be R_a≦3.2μm

2. Radial Deviation

3. Idler

Idler width as fellow

The surface roughness should be R_a≦3.2μm

Inner idler pulley should close to the large belt pulley.

Outer idler pulley should close to the small belt pulley.

Belt breaking

Inner adjustment:

Grooved idler pulleys are placed at toothed side of the belt and enable adjusting tension. 

The required circumstances as following:

Outer adjustment:

Flat idler pulleys are placed on outside of the belt and enable to adjust tension.

The required circumstances as following: