Geroler Motors – Low-Speed, High-Torque Hydraulic Performance

Gerotor and geroler motors are typically used in hydraulic systems that require low-to-medium speed and medium-to-high torque. These motors are compact, efficient, and well-suited to applications where smooth rotation and reliable output are essential.

Gerotor versus Geroler Design

At the heart of the gerotor motor is a simple but precise gear set:

• The inner rotor has N teeth, where N > 2
• The outer rotor has N + 1 teeth – one more than the inner rotor – allowing the motor to function

In a Geroler design, the stator’s wall is replaced with roller pins that form the displacement chambers. This tighter fit improves tolerance and reduces internal gaps, resulting in a more robust motor that performs better and lasts longer. The trade-off is a higher cost due to the added precision and durability.

Key Features and Benefits

• Low-to-medium speed, medium-to-high torque
• Compact and efficient hydraulic design
• Roller gerotor variants offer tighter tolerances and longer service life
• Gradual wear profile with reduced internal leakage
• Built to withstand demanding operating conditions

Explore Our Ultimate Guide to Hydraulic Motors

Want to understand how hydraulic motors work or which type suits your application? Our free Ultimate Guide to Hydraulic Motors introduces the key motor types, their uses, and operating principles – helping you make informed decisions.

Global Reach, Unbiased Access

As an independent supplier, we offer unbiased access to over 80 trusted hydraulic brands, including: Adan, Danfoss, Eaton Char-Lynn, Maxma, Bosch Rexroth and much more, ensuring you get the best motor for your application – not just a close match. Whether you need a standard gerotor motor or a geroller variant, we’ll help you find the best-fit solution.

Exporting seamlessly to over 130 countries worldwide, we support engineers, procurement teams, and maintenance crews across more than 20 sectors – from agriculture and marine to manufacturing and energy.

Frequently Asked Questions

What is a geroler motor used for? Geroler motors are used in hydraulic systems that require low-speed rotation and high torque output.

What’s the difference between gerotor and geroler motors? Roller gerotor motors use roller pins instead of the stator wall to form displacement chambers. This tighter fit improves performance, wear resistance, and longevity.

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