Glossary
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Rated service life
The lifetime resulting from the operation with the rated torque and the rated output speed is referred to as
the “rated service life”.
Allowable acceleration/deceleration torque
When the machine starts or stops, the load torque to be applied to the reduction gear is larger than the
constant-speed load torque due to the effect of the inertia torque of the rotating part. In such a situation, the
allowable torque during acceleration/deceleration is referred to as “allowable acceleration/deceleration
torque”.
Note: Be careful that the load torque, which is applied at startup and stop, does not exceed the allowable
acceleration/deceleration torque.
Momentary maximum allowable torque
A large torque may be applied to the reduction gear due to execution of emergency stop or by an external
shock. In such a situation, the allowable value of the momentary applied torque is referred to as
“momentary maximum allowable torque”.
Note: Be careful that the momentary excessive torque does not exceed the momentary maximum
allowable torque.
Allowable output speed
The allowable value for the reduction gear’s output speed during operation without a load is referred to as
the “allowable output speed”.
Note: The reduction gear temperature may exceed 60°C even when the speed is under the allowable
speed depending on the operation conditions (duty, load, ambient temperature, etc.). In such a case,
use the reduction gear at the speed so that the gear surface temperature is 60°C or lower.
Allowable moment and maximum thrust load
The external load moment or thrust load may be applied to the reduction gear during normal operation.
The allowable values at this time are referred to as “allowable moment” and “maximum thrust load”
respectively.
Note 1: The above specification values are noted in the catalog or separately provided
specification sheet.
Note 2: The “reduction gear” indicated in this manual refers to the “RS series turn table gearhead”
of the product.
Glossary
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External shock torque
Max torque for startup
Constant torque
Time
Max. torque
for stop
Shock torque at
emergency stop
