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Hollow Shoft Gear Motors

A hollow shaft gear motor (sometimes misspelled as "hollow shoft") is a gear motor whose gearbox has a hollow output shaft. Instead of using a solid output shaft with a coupling, the driven machine's shaft fits directly inside the hollow shaft and is secured with a key, shrink disc, or torque arm.

Key features

Hollow output shaft for direct mounting onto the driven shaft
Compact, space-saving design
Reduced need for couplings and adapters
Easy installation and alignment
Available in foot-mounted, flange-mounted, or shaft-mounted configurations

Typical specifications

Power: 0.12 kW to 30 kW or more
Output speed: Approximately 5–500 RPM
Gear ratios: Around 5:1 to over 1,000:1, depending on the gearbox type
Output bore sizes: Commonly 20 mm to 100 mm+, depending on the model
Mounting: Hollow shaft with keyway, shrink disc, or splined connection

Advantages

Saves installation space
Simplifies machine assembly
Improves shaft alignment
Reduces maintenance by eliminating external couplings
Suitable for high-torque applications

Common gearbox types with hollow shafts

Helical gear motors
Helical-bevel gear motors
Helical-worm gear motors
Worm gear motors
Parallel shaft gear motors

Typical applications

Conveyor systems
Bucket elevators
Screw conveyors
Mixers and agitators
Packaging machinery
Food processing equipment
Textile machinery
Material handling systems

Selection considerations

When choosing a hollow shaft gear motor, consider:

Required output torque
Output speed (RPM)
Motor power (kW or HP)
Shaft diameter and bore size
Mounting style (shaft-mounted, foot-mounted, flange-mounted)
Duty cycle and operating conditions
IP rating and environmental requirements

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