Gearhead/Linear Head: Gearhead Specifications

Torque Amplification

The torque of the gearhead output shaft can be calculated using the following formula.

• Permissible Torque

  T_G = T_M × i × η

• T_G

  Gearhead permissible torque

  T_M

  Motor torque

  i

  Gearhead gear ratio

  η

  Transmission efficiency of gearhead

Permissible Torque

As the gear ratio increases, the output torque increases proportionally. However, the load torque that can be transmitted by the gearhead may be limited by the gear material and other conditions. (The maximum value that can be limited is called the Maximum Permissible Torque)
The permissible torque is the torque that can be driven by the gearhead output shaft corresponding to the combined motor. Each value is shown as gear ratio in consideration of the transmission efficiency at the normal ambient temperature.

Transmission Efficiency

The transmission efficiency is a value determined by the structure of the reducer and the gear ratio, such as the type of gear and the number of gear stages, etc. In addition, transmission efficiency varies depending on ambient temperature. Care should be taken when using in a low-temperature environment as the transmission efficiency will drop along with the output torque.

• The transmission efficiency of decimal gearheads 2GV10X, 3GV10X, 4GV10X, and 5GV10X is 90 %, while the others are 81 %.
• For the transmission efficiency of right-angle gearheads, refer to the right-angle gearheads page. Transmission Efficiency of the Right-angle Gearhead

Note

• The transmission efficiency in the table above is the value at normal ambient temperature. The transmission efficiency of the gearhead varies depending on the ambient temperature.
  Care should be taken when using in a low-temperature environment as the transmission efficiency will drop along with the output torque.
• A number indicating the gear ratio is specified where the box □ is located in the product name.
  A letter indicating the shaft material is specified where the box ■ is located in the product name.

Rotation Speed and Rotation Direction

Rotation Speed

The rotation speed of the gearhead output shaft can be calculated using the following formula.

• $${N_G} =\frac{N_M}{ i}$$

• N_G

  Gearhead rotation speed [r/min]

  N_M

  Motor rotation speed [r/min]

  i

  Gearhead gear ratio

The rotation speed shown here in combination with an induction motor (AC motor) is calculated based on the synchronous speed of the motor, so the actual rotational speed will decrease by several percent depending on the size of the load. In some models, the actual gear ratio and the nominal gear ratio may differ slightly.

Rotation Direction

Indicates the rotation direction when viewed from the output shaft.
Depending on the gearhead gear ratio, the rotation direction of the motor and gearhead will change. For the rotation direction of each product, refer to the product page.

Permissible Radial Load and Permissible Axial Load

Permissible Radial Load

Indicates the permissible value for the load that can be applied in the perpendicular direction to the gearhead output shaft. You can find the permissible value at the position where the load is applied.

Permissible Axial Load

Indicates the permissible load value that can be applied in the axial direction of the gearhead output shaft.

Radial Load Calculation Formula

When a chain, gear, belt, etc. is used as the transfer mechanism, the radial load is always applied on the gearhead output shaft.

For the radial load calculation formula, refer to this page.