Synchronous Belt and Pulley: Calculation and Selection

Synchronous belt transmission is a new transmission mode that uses the meshing of belt teeth and belt teeth to transmit power.

It has accurate synchronous transmission function, no lubrication, no slip, no pollution and less noise;

The transmission efficiency reaches 0.98, the speed ratio range can reach 1:10, the allowable line speed can reach 50M / s, and the transmission rate ranges from hundreds of watts to hundreds of kilowatts, which is suitable for multi shaft transmission.

Widely used in textile, automobile, chemical fiber, cigarette, papermaking, printing, chemical and other mechanical equipment;

In recent years, the demand for mining metallurgy, steel machinery and medical equipment has increased day by day.

Synchronous belt

1. Selection and calculation of vertical synchronous belt and pulley:

Design requirements in the vertical direction: the dead weight of the tray and goods is 20kg (196N), and the time required for the slider to move 1250mm is 6S.

1. Design power

Check the table according to the working conditions and take Ka = 1.5

2. Belt type selection

According to

And pulley speed

Select 5m arc belt after checking the table.

3. Number Z and pitch diameter of belt teeth

According to the belt speed and installation size, Z choose the larger value as much as possible and select 5M belt by looking up the table, number of teeth z = 26, pitch diameter

Diameter of outer circle

4. Belt speed v

5. Transmission ratio

The driving and driven pulleys are consistent, the transmission ratio is I = 1, and the driving and driven pulleys are of the same model.

6. Initial center distance

7. Pitch length and number of teeth of initial belt

8. Actual center distance a

9. Reference rated power

Check the table

10. Bandwidth bs

11. Setting of retaining ring

5m pulley, minimum height of retaining ring k = 2.5 ~ 3.5, r = 1.5, thickness of retaining ring t = 1.5 ~ 2

Diameter of the bend of the retaining ring

Outer diameter of retaining ring

Vertical synchronous pulley:

Pulley type 5m circular arc tooth, pitch diameter 41.38mm, number of teeth 26, outer diameter 40.24mm, total pulley width 13.3mm, outer diameter of retaining ring 48.24mm, pulley hole 10mm, fixing method: set screw (side set screw fixing table width 7mm, threaded hole m3, two into 90 degrees)

Vertical synchronous belt:

Belt type 5m arc belt, with a bandwidth of 10.3mm and a pitch length of about 3418mm

Selection of synchronous pulley

The parameters needing attention in the selection of synchronous pulley: tooth shape, number of teeth, material and surface, pulley shape.

1. Tooth shape

The tooth shape of synchronous belt can be divided into English (ordinary torque) MXL, XL, L, H, metric (high torque) S2M, S3M, S4m, S5m, S8m and (ordinary torque) T5 and T10

The tooth shape can be selected according to the following table:

Simple type selection table 1 (MXL, XL, L, H, T5, T10)

Simple type selection table (MXL, XL, L, H, T5, T10)

Simple type selection table 2 (S*M)

2. Number of teeth

The number of teeth is an important parameter of the synchronous belt pulley.

The pitch diameter of the synchronous belt pulley = the number of teeth × Pitch / π

3. Material and surface treatment

The common materials of synchronous pulley are aluminum alloy and 45 steel, and the surface treatment is:

  • Aluminum wheel: natural color oxidation, black oxidation;
  • Steel wheel: Fe3O4 protective film, electroless nickel plating

4. Pulley shape





Specification of belt axle hole:

Specification of belt axle hole
pecification of belt axle hole

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