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Things You Need to Know About Timing Belt

Views: 0     Author: Site Editor     Publish Time: 2022-03-15      Origin: Site

The timing belt is an endless belt with steel wire rope or glass fiber as the strong layer and is covered with polyurethane or neoprene rubber. When the timing belt is driven, the transmission ratio is accurate, the force on the shaft is small, the structure is compact, the oil resistance, the wear resistance is good, and the anti-aging performance is good. Generally, the use temperature is related to the material of the timing belt.

The timing belt drive has been researched and patented many times as early as 1900, and it has been used since the Second World War. Because the synchronous belt is a transmission part with the advantages of chain, gear, and triangle belt, it has received attention with the development of the industry after the Second World War. It was first developed by the Uniroyal Rubber Company of the United States in 1940. In 1946, the Zynga company used the synchronous belt to transmit sewing machine needles and bobbins, achieved significant benefits, and was gradually introduced to other mechanical transmissions. The development and application of synchronous belt drive have only been over 70 years, but it has made rapid progress in various aspects.

Conveyor belts are widely used in various mechanical transmissions in various industries such as textiles, machine tools, tobacco, communication cables, light industry, chemical industry, metallurgy, instrumentation, food, mining, petroleum, automobiles, etc.

PBO Felt Belt

The Working Principle of Synchronous Belt

The timing belt drive comprises an endless belt with equidistant teeth on the inner peripheral surface and a pulley with corresponding teeth. During operation, the belt teeth mesh with the tooth grooves of the pulley to transmit motion and power. It is a comprehensive belt. A new type of belt drive with respective transmission advantages and chain drive gear transmission.

Kevlar Felt Belt


There are two types of synchronous belt teeth: trapezoidal teeth and arc teeth, and there are three series of arc teeth: arc teeth (H series also known as HTD belt), flat-top arc teeth (S series also known as STPD belt), and concave top parabolic teeth (R series).

Trapezoidal Tooth Timing Belt

Trapezoidal toothed timing belts are divided into single-sided and double-sided, referred to as single-sided and double-sided belts. The double-sided belt is divided into symmetrical tooth type (code DA) and staggered tooth type (code DB) according to the arrangement of teeth.

Trapezoidal Tooth timing belts have two size systems: pitch system and module system. China adopts the pitch system and has formulated corresponding standards GB/T 11361~11362-1989 and GB/T 11616-1989 for timing belt drive according to ISO 5296.

Arc Tooth Timing Belt

In addition to the curved tooth shape, the arc tooth timing belt has the same structure as the trapezoidal tooth synchronous belt, the pitch of the belt is equivalent, and its tooth height, tooth root thickness, and tooth-root fillet radius are all larger than those of the trapezoidal tooth. After the belt tooth is loaded, the stress distribution state is better, the stress concentration of the tooth root is eased, and the bearing capacity of the tooth is improved. Therefore, the arc tooth timing belt transmits more power than the trapezoidal tooth timing belt and can prevent the interference of the teeth during the meshing process.

The arc tooth timing belt has good wear resistance, low noise during operation, no need for lubrication, and can be used in harsh environments with dust. It has been widely used in food, automobile, textile, pharmaceutical, printing, paper, etc.


(1) Accurate transmission, no slippage during operation, and constant transmission ratio.

(2) The transmission is stable, with buffering, vibration reduction capabilities, and low noise.

(3) The transmission efficiency is high, up to 0.98, and the apparent energy-saving effect.

(4) Easy maintenance, no need for lubrication, and low maintenance cost.

(5) The speed ratio range is large, generally, up to 10, the linear speed can reach 50m/s, and it has a large power transmission range, which can reach several watts to hundreds of kilowatts.

(6) It can be used for long-distance transmission, and the center distance can reach more than 10m.

(7) Compared with V-belt transmission, the preload force is small, and the load on the shaft and bearing is small.

Timing Belts Manufacturer

We produce heat-resistant timing belts for the aluminum extrusion industry. Our team is always ready to offer advice or answer your questions. Contact us today for a free quote!

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