What Makes a Gearbox Inline?
In an inline planetary gearbox, the input shaft and output shaft are arranged along the same axis. The servo motor is mounted directly to the input side, while the output shaft transmits reduced speed and increased torque to the driven mechanism. This structure is simple to integrate, easy to align and suitable for many standard automation layouts.
Typical Inline Transmission Path
Servo motor output enters the gearbox input through a matched motor adapter and input bore.
Planetary gear stages reduce speed and increase torque within a compact cylindrical housing.
The output shaft delivers controlled motion to the machine mechanism on the same centerline.
When an Inline Planetary Gearbox Is the Better Choice
Inline gearboxes are often selected when the machine has enough axial space and the designer wants a direct, rigid and easy-to-install transmission path. Compared with a right angle layout, an inline configuration usually keeps the drivetrain simpler and more compact in width.
Direct Servo Axis Design
Suitable for equipment where the servo motor can be installed directly behind the driven shaft or linear module.
Limited Width, Enough Length
A good option when machine width is limited but there is enough axial space for motor and gearbox installation.
Stable Output Direction
Useful when the equipment requires a straight transmission direction without changing the axis by 90 degrees.
Standard Motor Matching
Commonly matched with servo motors through adapter flanges, input bore sizes and bolt patterns.
Common Equipment Using Inline Planetary Gearboxes
The inline structure is widely used in servo-driven equipment where compact transmission, fast response and clean installation are important. It is especially practical for repeated start-stop operation and controlled motion axes.
Ask for Selection SupportCNC Feed Axis
Used for feed drives, rotary systems and auxiliary motion where controlled speed and torque are required.
Linear Modules
Suitable for ball screw, belt drive and linear actuator systems driven by servo motors.
Conveyor Systems
Helps reduce motor speed and increase output torque for stable conveying and indexing motion.
Automation Modules
Used in compact motion units, positioning devices, handling equipment and assembly machines.
Key Parameters Before Selecting an Inline Gearbox
For a correct quotation and model recommendation, the gearbox should be selected according to real load and motor conditions. The following information helps avoid mismatch during installation and operation.
Inline Gearbox or Right Angle Gearbox?
The choice depends mainly on machine space and transmission direction. An inline gearbox is normally used for straight-axis transmission. If the machine needs a 90-degree output direction, a right angle planetary gearbox may be more suitable.
Choose Inline When
The motor and output shaft can stay on the same centerline.
The machine has enough axial installation length.
The design requires a simple, direct and rigid transmission path.
Consider Right Angle When
The machine needs to change output direction by 90 degrees.
Axial length is limited by the equipment structure.
The servo motor must be installed beside the driven mechanism.
What to Send for a Faster Recommendation
To help us select the right inline planetary gearbox, please send the following information if available.
Need an Inline Planetary Gearbox for Your Servo Motor?
Send your servo motor model, ratio, torque and mounting requirements. We will help you check a suitable inline planetary gearbox configuration for your equipment.
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