Adding an unloader control to the pump circuit allows the system to conserve power in both standby and running modes. This control should be installed in parallel with the inlet port of the hydrostat and as close as possible to the discharge side of the gears. It must be piloted by the same load-sensing signal that controls the hydrostat, enabling the pump to redirect all flow from the outlet to the secondary circuit at a pressure significantly lower than the hydrostat’s pressure-drop setting during standby mode.
The Automotive Lift Repair Orlando unloader control operates off the same remote load-sensing signal as the hydrostat. Unlike the hydrostat, the unloader poppet features opposing areas with at least a 2:1 ratio. If the line pressure exceeds 50% of the pump discharge pressure, the unloader control will close. The ability of the unloader control to reduce the pump discharge pressure to near atmospheric levels is regulated by the force of the poppet or plunger spring. It is set to the lowest value necessary to maintain the internal pressure loading of the gear pump. Compared to a standard fixed-displacement gear pump circuit, this control can lower standby power consumption by up to 90%.
Dual and Combined Controls
Combined control is achieved by incorporating a pilot relief, which enables the hydrostat to function as the main stage of a pilot-operated relief valve. This adjustment allows the hydrostat and the unloader control of the load-sensing gear pump to respond according to the discharge pressure. The patented method of conditioning the load-sensing line enhances the versatility of the load-sensing gear pump beyond just load sensing.
The Automotive Lift Repair Orlando combined-control load-sensing gear pump is designed for large-displacement pumps and redirects secondary flow to the tank. This patented technology can be utilized in the same applications as the dual-control pump. However, since the secondary flow must be routed to the tank, it cannot be employed when the secondary circuit is driving a load.
Hydraulic pumps and hydraulic motors serve different functions:
A hydraulic pump uses a motor to generate output pressure energy (pressure and flow), while a hydraulic motor converts input pressure oil into mechanical energy (torque and speed).
Difference 1: Output Mechanism
The Automotive Lift Repair Orlando hydraulic pump acts as a conversion device that transforms the mechanical energy from the motor into hydraulic energy, producing flow and pressure, with a focus on high volumetric efficiency. In contrast, the hydraulic motor converts the pressure energy of the fluid into mechanical energy, outputting torque and rotational speed, aiming for high mechanical efficiency. Thus, the hydraulic pump is an energy device, whereas the hydraulic motor functions as an actuator.
Difference 2: Output Shaft Rotation
The output shaft of a hydraulic motor must be capable of rotating in both directions, resulting in a symmetrical structure. Conversely, many hydraulic pumps (like gear and vane pumps) have specific rotation requirements, allowing for only one direction of rotation without the option to change direction.
Difference 3: Oil Port Configuration
In addition to the oil inlet and outlet, hydraulic motors typically include a separate oil leakage port. Most hydraulic pumps, on the other hand, usually only feature an inlet and outlet (with the exception of axial piston pumps), and any leakage oil is directed back to the inlet.
Difference 4: Volumetric Efficiency
Hydraulic motors generally have lower volumetric efficiency compared to hydraulic pumps.
Difference 5: Operating Speeds
Typically, Automotive Lift Repair Orlando hydraulic pumps operate at relatively high speeds, while hydraulic motors have lower output speeds.
Difference 6: Oil Port Specifications
The oil suction port of a gear pump is larger, while the discharge port is smaller. In contrast, both the suction and discharge ports of a gear hydraulic motor are of equal size.
Difference 7: Functions
The role of the pump is primarily to transport various liquids, including water, oil, acids, emulsions, and liquids with suspended solids, as well as gas-liquid mixtures. The motor’s function involves rotating an energized coil within a magnetic field, driving the starter rotor, which then rotates the pinion attached to the rotor to turn the engine flywheel, ultimately driving the crankshaft.
Although hydraulic pumps and hydraulic motors share similar designs and overall construction, they are not the same component. The differences may be subtle, but they significantly impact how each functions. If you want to understand how hydraulic pumps and motors differ, this guide is for you!
Hydraulic Pumps
At its core, an Automotive Lift Repair Orlando hydraulic pump is a component within a hydraulic system that converts the mechanical energy generated by the main mover—typically a rotational force—into liquid energy, usually resulting in oil flow. The flow rate of this oil is measured in gallons per minute (GPM), which determines the operating speed of the system. There are various types of hydraulic pumps available, including gear pumps, piston pumps, vane pumps, and more.
Hydraulic Motors
In a functioning hydraulic system, hydraulic motors serve as the actuators, alongside cylinders. These actuators perform the physical work within the system. Similar to other types of motors, a hydraulic motor converts the fluid energy produced by the hydraulic pump into mechanical energy, enabling the motor to perform physical tasks. Like hydraulic pumps, hydraulic motors can be designed with gears, vanes, or pistons, though the rotary design is the most common.
How They Work Together
In a hydraulic system, the pump transforms mechanical energy into liquid energy in the form of oil flow. This Automotive Lift Repair Orlando oil flow then needs to be directed to the hydraulic motor via various types of valves, such as directional control valves, selector valves, or flow dividers. Once the oil flow reaches the motor, it is converted back into mechanical energy to perform tasks related to physical work.
So What’s the Difference Between the Two?
The Automotive Lift Repair Orlando hydraulic pump and motor serve opposing functions: one converts mechanical energy into oil flow, while the other converts oil flow back into mechanical energy. Despite their distinct purposes, both components depend on each other to effectively fulfill their roles within the hydraulic system.