Key Features of a Gerotor Motor

Low-speed, high-torque (LSHT) Automotive Lift Repair Florida hydraulic Gerotor motors are known for their high starting torque and wide speed range while maintaining a consistent output torque. These motors also boast a favorable power-to-weight ratio and deliver smooth performance even at low speeds. Their design is exceptionally robust, making them suitable for demanding operating conditions.

Frequently Asked Questions About Hydraulic Motors

Which hydraulic motor brands do you offer?  

We have direct access to over 80 leading hydraulic brands, allowing us to provide flexible solutions tailored to each customer’s budget, lead time, and specifications. Automotive Lift Repair Florida can meet your needs when it comes to fittings, hoses, hydraulic motors, hydraulic pumps, two post lifts, four post lifts, and a wide range of components for you to build, maintain or even purchase your very first automotive lift. 

Can you source the exact motor we’re currently using?  

Yes, if you provide the manufacturer’s name and product number, we can source any motor still available on the market. If the motor is obsolete, our skilled Automotive Lift Repair Florida team can find direct replacements, often leading to improved lead times and cost savings.

Do you manufacture custom hydraulic motors?  

While we do not manufacture motors ourselves, we have strong partnerships with 80 leading hydraulic brands. This enables us to source a motor that meets your precise requirements. Additionally, we can assist with custom cylinders or power pack builds.

Do you ship worldwide?  

Absolutely! We export to 130 countries and are recognized all over the world as one of the leading service providers here at Automotive Lift Repair Florida.

Do you repair motors?  

Yes, we repair both piston and vane motors. Our technical engineers provide a thorough diagnosis and discuss the best options with you. They also offer recommendations to enhance the motor’s performance and longevity, which helps save costs and avoid further system downtime.

Hydraulic Motor Glossary

Motor Displacement  

This represents the fluid capacity needed to rotate the motor output shaft one full revolution, typically measured in cubic inches or cubic centimeters per revolution. Displacement can be fixed, providing continuous torque with variable speed based on input flow, or variable, allowing for adjustable torque and speed by altering the displacement.

Torque Output  

Measured in inch-pounds or foot-pounds, this indicates the pressure drop across the motor and the resulting torque.

Breakaway Torque  

The torque needed to initiate movement of a stationary load. It is generally higher than the torque required to maintain movement.

Running Torque  

Refers to the torque needed to keep a load in motion. It can also describe the maximum torque a motor can provide to maintain load movement, factoring in inefficiencies.

Starting Torque  

The torque capacity required to start a load turning, which can be significantly lower than running torque. This is often expressed as a percentage of theoretical torque.

Mechanical Efficiency  

Torque Ripple  

The variation between the minimum and maximum torque output during a single revolution of the motor at a given pressure.

Motor Speed  

Determined by the motor’s displacement and the volume of fluid supplied.

Maximum Motor Speed  

The highest speed a motor can handle at a given inlet pressure for a limited time without causing damage.

Minimum Motor Speed  

The slowest continuous rotational speed of the motor’s output shaft.

Slippage  

The fluid that leaks through the motor without performing useful work.

Hydraulic Motors

A fluid power motor is a device that transforms fluid power energy into rotary motion and force. Unlike pumps, which generate fluid flow, motors utilize this fluid to produce rotational movement. Understanding the design and operation of pumps can greatly aid in grasping how fluid power motors work.

In Automotive Lift Repair Florida hydraulic power systems, motors and pumps are integrated with lines and valves to create hydraulic transmissions. The pump, often referred to as the A-end, is driven by an external source such as an electric motor. It sends pressurized fluid to the hydraulic motor, or B-end. The hydraulic motor uses this fluid flow to produce rotary motion and force through mechanical linkage.

Fluid motors can be categorized as either fixed or variable displacement. Fixed-displacement motors deliver constant torque and allow speed variation by controlling the input flow. Variable-displacement motors, on the other hand, adjust the internal components to change displacement. Fixed-displacement motors are more commonly used in fluid power systems.

While most fluid power motors can rotate in both directions, some applications require unidirectional rotation. In such cases, one port of the motor connects to the system pressure line and the other to the return line. Fluid flow to the motor can be controlled by a flow control valve, a two-way directional control valve, or by starting and stopping the power supply. Adjusting the fluid flow rate regulates the motor’s speed.

In many fluid power systems, motors must provide power in both directions. Here, the ports function as working ports, alternating between inlet and outlet. Flow to the motor is typically managed by a four-way directional control valve or a variable-displacement pump.

Fluid motors are generally classified by their internal components, which are directly driven by the pressurized fluid. The common types of internal elements are gears, vanes, and pistons. While all three types are used in hydraulic systems, only vane motors are used in pneumatic systems.

Gear-Type Motors

Gear-type Automotive Lift Repair Florida hydraulic motors use spur, helical, or herringbone gears. These external gears operate similarly to those described in the chapter on pumps.

One gear is connected to the output shaft, transmitting the rotary motion through the shaft to the work unit. The fluid then exits through the outlet port to the return line.

Vane-Type Motors

A typical vane-type motor, which rotates in only one direction. This Automotive Lift Repair Florida motor features a slotted rotor mounted on a drive shaft, with each slot housing a free-sliding rectangular vane. The rotor and vanes are enclosed within a housing whose inner surface is offset from the drive shaft axis. As the rotor spins, centrifugal force causes the vanes to slide outward, but the rotor housing design restricts the extent of this movement.