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: Depending on the conditions of use (duty ratio, load, ambient temperature), the reduction gear
surface temperature may exceed 60°C even when the speed is under the allowable output speed. In
such a case, either take cooling measures or use the reduction gear at a speed that keeps the surface
temperature at 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” described in this manual indicates the precision gearhead RH series of the
product.
Glossary
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Time
External shock torque
Max. torque for startup
Constant torque
Shock torque at
emergency stop
Max.
torque for
stop
