Technical Library

Backlash of Timing belt and Pulley

What is "Backlash"?

Backlash refers to the gap between the teeth of the timing belt and those of the timing pulley, which serves to facilitate smooth engagement between the belt and pulley teeth.

What is the benefit of smaller backlash?

The smaller the backlash amount, the better the positioning accuracy. A tooth profile in which the amount of backlash is reduced to the utmost limit is called a backlashless pulley. The following data is a comparison of our backlashless pulleys and standard pulleys.

【Evaluation conditions】
Pulley tooth profile S3M: Number of pulley teeth 24 teeth: DR rotation speed 1.5 rpm: DN No load: Belt tension 46.5 N: Rotation angle 66°.

Backlash

	2mm pitch	3mm pitch	5mm pitch	8mm pitch	14mm pitch
SUPER TORQUE	0.07	0.06	0.075	0.4*¹	0.6*²
MEGA TORQUE G	―	0.06	0.075	0.4	0.6
MEGA TORQUE EX	―	0	0	―	―
MEGA TORQUE GⅡ	―	―	―	0.4	0.6
MEGA TORQUE GⅡP	―	―	―	―	0.6
MEGA TORQUE GⅢ	―	―	―	0.4	0.6
GIGA TORQUE GX	―	―	―	0.265	0.665

*1:BacklashlessPulley:0.120　*2:BacklashlessPulley:0.200

MEGA TORQUE EX

MEGA TORQUE EX is developed with excellent positioning accuracy.

Special features

Prevents tooth jump at quick accelation and slowdown.
Reduces positioning time by 10%
Improved positioning repeatability by 17%

Highly recommended for…

Increased transfer volume per unit time.
improve the accuracy of stopping at the target position.

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