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Synchronous pulley




The main models of synchronous belt and synchronous pulley are trapezoidal teeth-MXL, XL, L, H, XH, XXH, T2.5, T5, T10, T20; High torque arc teeth -3M, 5M, 8M, 14M, 20M, S2M, S3M, S4.5M, S5M, S8M, S14M, etc.

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The timing belt is made of three main materials: neoprene, glass fiber thread and elastic nylon cloth. It is a special rubber transmission belt used for various mechanical transmissions. It is the use of gear and gear with the anastomosis of transmission, and thus both gear transmission, chain transmission and belt transmission of the three integrated characteristics.
The use of rubber synchronous belt drive has the following advantages:
Ensure synchronous transmission without slip between transmission wheels
The transmission speed ratio can reach 10, and the transmission speed can reach 40 M/S
The transmission power can be from a few watts to the upper kilowatt
The transmission structure is simple and light, and does not require lubrication
No need for large initial tension, small shaft load
Low running noise
Simple maintenance, easy replacement, etc.


Arc tooth Timing tooth

trough type Pitch pb Cogging depth hg Radius of cogging arc R Tooth tip circle angle r1 Cogging width s Twofold pitch 2δ tooth profile angle View
3M 3 1.28 0.91 0.26~0.35 1.90 0.762 ≈ 14 ° Detailed Specifications
5M 5 2.16 1.56 0.48~0.52 3.25 1.144 ≈ 14 ° Detailed Specifications
8M 8 3.54 2.57 0.78~0.84 5.35 1.372 ≈ 14 ° Detailed Specifications
14M 14 6.20 4.65 1.36~1.50 9.80 2.794 ≈ 14 ° Detailed Specifications
20M 20 8.60 6.84 1.95~2.25 14.80 4.320 ≈ 14 ° Detailed Specifications



Dimension of linear type pulley

Width of tooth groove bottom bw 0.84±0.05 1.14±0.05 1.32±0.05 3.05±0.10 4.19±0.13 7.90±0.15 12.17±0.18
Cogging depth hg 0.69 0 0.84 0 1.65 0 2.67 0 3.05 0 7.14 0 10.31 0
-0.05 -0.05 -0.08 -0.10 -0.13 -0.13 -0.13
Cogging half angle Φ 1.5 ° 20 25 25 20 20 20 20
Root fillet radius rb 0.35 0.35 0.41 1.19 1.60 1.98 3.96
Top fillet radius rt 0.13 0.05 0.30 0.05 0.64 0.05 1.17 0.13 1.60 0.13 2.39 0.13 3.18 0.13
0 0 0 0 0 0 0
Twofold pitch 2β 0.508 0.508 0.508 0.762 1.372 2.794 3.048



1. Form of synchronous belt wheel

2. Tooth size, tolerance and technical parameters

3. Various types of synchronous belt gear surface width size table

4. Ordering Instructions

arc gear transmission type:

  1. Circular arc cylindrical gears are divided into single circular arc gears and double circular arc gears.
  2. The contact line strength of the single circular arc gear is higher than that of the involute gear under the same conditions, but the bending strength is lower than that of the involute gear.
  3. The circular arc gear mainly adopts soft tooth surface or medium hard tooth surface, and the low tooth is generally used when the hard tooth surface is adopted.

arc gear drive design steps:

  1. Simplified design: according to the transmission power of the gear transmission input speed, transmission ratio and other conditions, determine the center distance, modulus and other main parameters. If the center distance and modulus are known.
  2. Skip this step.
  3. Geometric design calculation: design and calculate the basic parameters of the gear, and calculate the geometric size.
  4. Strength check: After the basic parameters are determined, the tooth surface contact strength and tooth root bending strength are accurately checked.
  5. If the check does not meet the strength requirements, you can return

Features of circular arc gear transmission:

  1. Arc gear transmission pilot meshing transmission, the value is applicable to helical gears, not spur gears.
  2. The relative curvature radius is larger than the involute, and the contact strength is higher than the involute.
  3. It is more sensitive to the change of center distance than the involute. During processing, the cutting depth is required to be high, radial displacement cutting is not allowed, and assembly errors are strictly controlled.

single arc gear transmission
The convex tooth working profile of the small gear is outside the pitch circle, and the center of the tooth profile is on the pitch circle; the concave tooth working profile of the large gear is within the pitch circle. The center of the tooth profile is outside the pitch circle. Since the tooth profile arc radius p2 of the large gear is slightly larger than the tooth profile radius p1 of the small gear, when the two tooth profiles turn to point k and their common normal passes through node c, the teeth will contact and immediately separate, but the tooth profile of the other end face adjacent to it will immediately contact, I .e. the two teeth K1. K'1, K2, K2, K3. K... points will contact along the meshing line in turn. Therefore, the concave and convex tooth profiles on either end face of the arc gear are only instantaneous meshing. -The new circular arc gear is theoretically instantaneous point meshing, so the circular arc gear transmission is often called circular arc point meshing gear transmission. After the teeth are run-in, the tooth profile can actually have a considerable length of line contact along the tooth height. The characteristics of circular arc gear transmission are: (1) the radius of integrated curvature is much larger than that of involute gear transmission. Its contact strength is about 0.5 to 1.5 times higher than that of the involute gear transmission: (2) the rolling speed of the two-wheel teeth along the meshing line is very large. It is easy to form an oil film between the tooth surfaces, and the transmission efficiency is high, generally up to 0.99~0.995; (3) The circular arc gear wears evenly along the tooth height direction and is easy to run together: (4) The national arc gear has no undercutting phenomenon, so The minimum number of teeth can be less. However, the sensitivity of the circular arc gear to the center distance cutting depth and helix angle is very large. These three errors have a great influence on the carrying capacity, so the circular arc gear has a high requirement for cracking and installation accuracy. In addition, the single arc gear tooth bending strength is weak: cutting the same modulus of large, small gear, need to use two different hob.

double circular arc gear transmission
When working, from an end face, the concave part of the driving gear tooth first pushes the convex part of the driven gear tooth, and then pushes the concave part of the other side with its convex part after leaving. Therefore, the double-arc gear transmission has two contact points at the same time in theory. After running, this transmission actually has two contact lines, so it can realize multiple pairs of teeth and multi-point meshing. In addition, due to its large tooth root thickness, the double circular arc gear transmission not only has a bearing capacity of about 30% higher than that of the single circular arc gear transmission, but also has a smooth transmission, less vibration and noise, and can be processed with the same hob. Therefore. High speed and heavy load, double circular arc gear transmission has the tendency to replace the single circular arc gear transmission.

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