Reducers

Reducers are mechanical device that outputs power obtained from the output shaft of a power source such as a motor by reducing the rotational speed using gears.

The ratio of the number of gear teeth on the input and output sides is the reduction ratio, and the torque at the output shaft is inversely proportional to the reduction ratio.

Our line-up includes three gear types - helical gears, hypoid gears and worm gears - which can be selected according to the motor specification, shaft arrangement (parallel or right-angle shaft) and output shaft shape (solid or hollow) to suit the purpose.

Types and features of gears

The following five kinds of gears are used in our reducer. The features of each gear are shown in the table below.

Hypoid gear Cylindrical Worm Troidal Worm Bevel gears Helical Gear
Gears Gear Picture Gear Picture Gear Picture Gear Picture Gear Picture
Axis Position Right angle shafts Parallel shafts
Skew Cross
Efficiency 80% 40~70% 40~80% 90% 90%
Noise Good Excellent Excellent Fair Fair
Self-Locking ※ None Provided
(Reduction ratio 1/60)
Provided
(Reduction ratio 1/60)
None None

※Self-Locking: This is a function of the worm gear that the input shaft side cannnot be turned from the output shaft side.
Generally, reduction ratio is 1/60 as a single-step reduction.

Worm Reducer (Worm Power Drive / Troi Drive)

Worm reducer is geared reducer (gearboxes) using worm gears. Unlike other types of gear transmissions, it make sliding contact, resulting in extremely low vibration and noise, and a large reduction ratio (generally 1/10 to 1/60) can be achieved with a pair of worm gears.

In addition, it is a gear that can be expected to have a reverse rotation prevention (Self-Locking) effect.

Two types of worm gears, drum-shaped type/cylindrical type have been adopted. Drum-shaped type (Troi drive worm) achieves high transmission capacity and compact equipment, while Cylindrical type (cylindrical worm) optimizes capacity, efficiency and cost.

A wide range of variants are available for a variety of applications.

See more about the outstanding features of Tsubaki Worm Reducers

Troidal Worm Gear

Troidal Worm Gear

TD series

Troidal Worm Gear is high performance worm that is ideal for compact equipment as it has a high transmission capacity and high functionality by transmitting the load with their entire tooth surface.

Cylindrical Worm Gear

Cylindrical Worm Gear

EWJ・EW・SWJ・SW・TM series

Years of experience in designing tooth surface with unsurpassed transmission capacity went into making a well-balanced cylindrical worm gear in terms of performance, efficiency, and cost.

Troidal Worm Gear Structural drawing
Cylindrical Worm Gear Structural drawing

High power, lightweight and compact

Troi Drives and Worm Power Drives are the most compact among right-angle gear reducers at the same load conditions with their high loading capacity.

Compared to general-purpose cylindrical worm gears, Tsubaki Worm Power Drives are one size smaller in frame size, and Troi Drive gears are two sizes smaller. In other words, Tsubaki worm gear boxes are 1.5 to 2 times higher in torque capacity when compared to others in same sizes.

Torque comparison Frame size 200, input 1750r/min

High power, lightweight and compact
High power, lightweight and compact

High efficiency and energy saving

Tsubaki achieved high efficiency, in pursuit for optimal teeth profile for smooth sliding transmission with less engagement loss.

Efficiency comparison Frame size 200, input 1750r/min

Efficiency comparison

Silent and smooth operation

Troi Drives and Worm Power Drives with extremely high tooth profile accuracy provide quiet and smooth rotation.

TD series adopting troidal worm also has a higher number of simultaneously engaged teeth, further reducing uneven rotation.

Number of teeth engaged

Number of teeth engaged

Troi Drive 4 to 6.5 teeth
General-purpose cylindrical worm gears 1.7 to 2 teeth

Stable rotation speed

Tori Drive has the smallest angular transmission error in any geared reducer due to the large number of teeth engaged at the same time.

Troi Drive angularity transfer error data

Troi Drive angularity transfer error data Data: Size 125, reduction ratio 1/60

Angular velocity variation

Angular velocity variation

Troi Drive TD Series

Model No.  TD~

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High performance worms using a drum-shaped troidal worm provides high transfer capacity and high efficiency.

  • ・The drum-shaped Troidal worm gear transmits power across its entire surface, giving this drive high transmission capacity and functionality. This high-performance worm gear reducer is ideal for designing compact equipment.
  • ・The gear teeth mesh in a very unique way to achieve virtually no rotation variation.
  • ・Available in eight frame sizes: 125 to 315, and reduction ratios from 1/10 to 1/60, and 1/100 to 1/3600.
  • ・Available in a foot-mounted housing with a solid output shaft, or a flange-mounted housing with a hollow output shaft.
  • ・Ensures ultimate compactness and weight saving for all layouts.
Size

Inter-shaft distance
125~315mm

Reduction ratio

1/10~1/3600

Torque

2700~47000N・m

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High precision and compact The optimized design featuring basic foot mounting achieves a balance between cost and maintainability, and a range of variations allow equipment to be more compact.

  • ・Achieves increased capacity, efficiency, and cost effectiveness without compromising accuracy and small footprint.
  • ・Foot mounting style is standard. Both solid and hollow output shaft types are available.
  • ・Selection ranging from small size to medium size (center distance: 25mm-200mm)
  • ・MR series is compatible with High Efficiency motors. (IE3 Class : Premium Efficiency )
Size

Inter-shaft distance
25~200mm

Reduction ratio

1/10~1/3600

Torque

12~5300N・m

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Uses a dedicated case for on-shaft and flange mounting, contributing to equipment simplification.

  • ・Achieves increased capacity, efficiency, and cost effectiveness without compromising accuracy and small footprint.
  • ・Both solid and hollow types of output shafts are available.
  • ・Power-Lock and taper bush shafts are available, saving you manpower and time for assembly.
  • ・Selection ranging from small size to medium size (center distance: 25mm-200mm)
  • ・MR series is compatible with High Efficiency motors. (IE3 Class : Premium Efficiency )
Size

Inter-shaft distance
25~200mm

Reduction ratio

1/10~1/3600

Torque

12~5300N・m

TERUS

Model No.  EWGM・SWGM・TDGM~

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TERUS series combines worm reducers and helical gear motors.

  • ・Excellent worm characteristics :Can be configured to conform to many applications and goals, such as those that require high strength, quietness, and self-locking properties.
  • ・Smaller equipment footprint :Reduces equipment footprint and costs through a reduction in the number of components used.
  • ・Wide variety of options :Supports a wide variety of motor and brake options, including variable frequency motors and manual quick-release brakes.
  • ※This is a made-to-order product. Please contact us when considering.
Motor Capacity

3 Phase  0.1~2.2kW

Reduction ratio

1/100~1/3600

Torque

39~11143N・m