Hydraulic motors are devices used to convert hydraulic energy into mechanical energy. Hydraulic motors designed in various configurations are used to cater to different projects and their requirements. One such design configuration is the hydraulic gear motor.

What is a Hydraulic Gear Motor?

Hydraulic gear motors convert hydraulic flow and pressure into angular displacement and torque through a shaft. These motors are suitable for general applications.

Hydraulic gear motors can be supplied as single or double-directional based on their usage, and they are preferred in either aluminum or cast iron bodies, depending on application conditions. They offer design options that can handle radial loads. Additionally, alternative configurations include pressure relief valve, anti-cavitation valve, and speed sensor to meet specific application needs.

hydraulic gear motors

Preference for Hydraulic Gear Motors as Design Configuration

Hydraulic gear motors are designed to produce higher torque with minimal friction.

Here are some advantages of gear motors

  • They have compact and lightweight designs.
  • They are cost-effective.
  • They can adapt to a wide range of speeds.
  • They can operate within a broad temperature range.
  • They are compatible with a wide range of viscosity levels.
  • They are resilient against high impacts.

The level of contamination in the hydraulic oil used can negatively affect the lifespan of the motor if it exceeds the NAS 9 cleanliness level. The gears in hydraulic gear motors gradually wear down the main bushings or the body until they become unusable. This gradual decrease in efficiency serves as an indication that the gear motor needs to be replaced before encountering catastrophic issues. Taking preventive measures before the machine stops functioning can prevent project disruptions.

Considerations for Selecting Hydraulic Gear Motors

When selecting a hydraulic gear motor, the specifications of the project and the machine should be taken into account. Failing to accurately evaluate a machine's efficiency can result in costly consequences. In today's energy-conscious world, choosing efficient gear motors can reduce energy consumption and lower costs.

Once the system requirements and operating conditions of the machine are determined, several important factors should be considered before selecting a hydraulic gear motor:

  • Required output torque (Nm)
  • System minimum and maximum pressure (bar)
  • Operating temperature range (C)
  • Maximum operating speed (rpm)
  • Required displacement volume (cc)
  • Flange, shaft, and inlet-outlet port dimensions

Hydraulic gear motors and hydraulic gear pumps complement each other in the operation of hydraulic machinery. They differ in design and operating principles. 

What is the Difference Between Hydraulic Gear Pumps and Hydraulic Gear Motors?

Hydraulic motors convert hydraulic energy into mechanical energy, while pumps convert mechanical energy into hydraulic energy.

They are manufactured with different machining tolerances and undergo different testing procedures. Despite these differences, hydraulic gear motors and pumps can be configured as single or double-directional, offering two options for rotational direction.