Mini Hydraulic Gear Pump – Low Cost Engineering Project

This miniature hydraulic gear pump was designed to provide an affordable and accessible solution for engineers, students, makers, and hobbyists interested in developing small-scale hydraulic systems.

The pump uses a pair of 12-tooth gears with an approximate outer diameter of 14 mm, resulting in a compact design suitable for educational, experimental, and prototype applications. The model is optimized for 3D printing and can be manufactured using common desktop FDM printers.

This project is released low cost of charge to encourage innovation and help the community explore hydraulic technology without the expense of industrial components.

Recommended ApplicationsMiniature excavatorsHydraulic robotic armsLifting systemsEducational demonstrationsEngineering prototypesFluid power experimentsRecommended Motors

For optimal performance, DC motor 550 or better with high torque are recommended due double Oring friction

Motor speed and operating pressure should be adjusted according to the fluid used and the mechanical properties of the printed material.

Recommended Materials

For the pump housing, ABS is highly recommended due to its slight elasticity, improved sealing characteristics, impact resistance, and better tolerance to mechanical stresses commonly found in hydraulic applications.

For the gears, Tritan is recommended because of its excellent toughness, dimensional stability, wear resistance, and low friction characteristics.

Other materials may be used, but performance and durability may vary.

Sealing Recommendations

Proper sealing is essential for achieving good hydraulic performance.

For best results:

Apply spray paint to the internal surfaces to help seal microscopic pores commonly found in FDM-printed parts.Use thin EVA foam gaskets between the housing and covers.Install O-rings in the dedicated grooves provided in the design.Ensure all mating surfaces are flat and properly aligned during assembly.Shafts

Polished steel shafts are strongly recommended for reliable operation and reduced friction.

Important Note

This model is intended for experimentation, education, and engineering development. Performance may vary depending on print quality, material selection, assembly accuracy, fluid viscosity, operating conditions, and system pressure.

Happy building and engineering!