To calculate the efficiency at a rotational speed, use the following formula.

*Efficiency is the efficiency under continuous operation with a load factor of 100%, using our proprietary lubricant, with the oil temperature stable and the oil having settled in, and is calculated after subtracting the theoretical efficiency of the gears, the expected sliding resistance of the bearings and oil seals, and the lubricant stirring loss.

When using in elevators or inverter drives, it is necessary to consider the required input torque based on the efficiency at startup.

For starting efficiency, please refer to single reduction or Double reduction models. For Troi Drive TD series, please contact us.

If a reducer that is too large for the motor is selected, the no-load loss of the reducer itself may cause the rated current value to be exceeded.

Please select a motor with sufficient capacity.

The transmission capacity listed on the product page is the transmission capacity when the oil temperature is stable during continuous operation at a load factor of 100% and using recommended oil.

Therefore, when starting up in a cold environment or when operating for short periods with frequent starts and stops and where the oil temperature does not rise, the fluidity of the lubricating oil decreases and stirring resistance increases, resulting in a decrease in efficiency and the transmission capacity listed on the product page not being achieved.

As a rough guideline, please consider the following abilities with the following discounted.

Discount rate when oil temperature is not stable (reference value)

*For Double reduction types, please contact us.

The effect of the reducer preventing the input shaft from rotating when an attempt is made to rotate it from the output shaft is called self-locking, and the effect of the input shaft being able to rotate but requiring a large force from the output shaft is called self-locking property.

These are characteristics unique to worm reducers.

With Worm Power Drive and Troi Drive, self-locking can be expected when stationary at a reduction ratio of 1/60, but as they are designed to be efficient, the self-locking ability is slightly lower than with conventional products.

Notes on self-locking

If you require self-locking for elevators, inverting machines, etc., we can provide reinforced self-locking specifications (special items), so please contact us.

• (1) The effectiveness of self-locking devices may decrease if they are subjected to shock or vibration. Self-locking cannot be guaranteed, so if reliable stopping or holding is required, be sure to provide a separate holding device.
• (2) In applications with extremely large load inertia (traveling or swinging devices, etc.), the self-locking and self-locking properties can cause sudden braking, which can be very dangerous. For such applications, select a reduction ratio of 1/10 to 1/20.

When a servo motor is used as input, it can be used within the range of input capacity (kW) for each input rotation speed of the reducer.

Also, please consider slow starts and slow downs when accelerating and decelerating as much as possible.

Please contact us if you plan to use the product at an input rotation speed exceeding 1750 r/min. We also offer the TERVO^​ reducer for servo motors, which can handle input rotation speeds up to 3000 r/min.