The transfer capacities listed in the product page assume the reducer is driving a load rate of 100% using the recommended oil in continuous operation, and at constant oil temperature.

Efficiencies will lower during cold starts, and when the oil temperature has yet to stabilize due to frequent starts and stops. This is due to the low fluidity of the lubrication oil which increases the mixing resistance of the oil, thus resulting in less transfer capacity than published in the product page.

To make a general estimate, discount the capacity using the ratios given below.

Efficiency ratio (reference) to use before oil temperature settles.

※Refer to the worm gear reduction ratio for TERUS combinations in the Characteristics table.

A worm gear reducer is said to be self-locking if the input shaft does not begin to turn when force is applied to the output shaft to turn it from a standstill condition. If, in fact, the input shaft turns but requires a large force on the output shaft, known as the braking effect, the reducer is said to have self-locking properties.

This is the characteristics of the worm gear reducer. These effects are factors of the lead angle and surface condition of the teeth on the worm gear, as well as lubrication.

Our standard EWJGM/EWGM(R)/SWJGM(R)/SWGM(R) Series with a reduction ratio of 1/60 can be expected to be self-locking from a standstill condition.

※Notes about self-locking and self-locking properties

• (1)Shocks or vibration may reduce the self-locking effect.
  Self-locking is not guaranteed. For applications that require the output to be held still, the user should furnish a brake or other means of restraint.
• (2)If the braking effect occurs in applications where an extremely heavy load inertia is being moved (such as equipment that travels or swings), the self-locking effect or properties can be dangerous. For such applications, select a reduction ratio from 1/10 to 1/20.