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hydraulic pumps from Phoenix Hydraulics that serve virtually every industry. We specialize in components for mobile equipment.

Bent Axis Pumps

In this hydraulic pump the pistons are at an angle to the drive shaft and Thrust Plate. The piston block shaft is connected to the drive shaft by a universal joint. The drive shaft, thrust plate, piston block shaft, and piston block all revolve. The connecting rods are attached to the thrust plate and revolve with it, unlike the swashplate pumps where the piston rods slide past a stationary swash plate. As it revolves, half the pistons suck in fluid as they pass over the intake port. The other pistons discharge their fluid through the outlet port.

Swashplate hidraulic pumps have a rotating cylinder containing pistons. A spring pushes the pistons against a stationary swash plate, which sits at an angle to the cylinder. The pistons suck in fluid during half a revolution and push fluid out during the other half. For a given speed swashplate units can be of fixed displacement, or variable by having a variable swashplate angle. The greater the slant the further the pistons move and the more fluid they transfer.

These are extremely simple and reliable. Depending on the number of teeth, the "idler" gear might be driven directly by the "drive" gear. The teeth can be spur (straight), helical (slanted), herringbone, etc. Two pairs of valves can be added to make this a Reversing Gear unit, which work in the same direction regardless of which direction the gears rotate.

These hdyraulic pumps offer high pressure capability, in excess of 9,000psi/600 bar, and are available in multiple piston variations. Single bank piston arrangements are possible for (3) and (5) pistons models, while a “double bank” version incorporates (10) pistons. Outlet ports for the se can be combined or individual, permitting greater flexibility in separating functions from a single source. Displacements begin at 1.5cc/rev with 14 models spanning displacement up to 19.4cc/rev.

Vane pumps are often used in power steering units and automatic transmissions. The vanes are in slots in the rotor. When the rotor spins, centrifugal force pushes the vanes out to touch the casing, where they trap and propel fluid. Sometimes springs also push the vanes outward. When the vanes reach the return side they are pushed back into the rotor by the casing. Fluid escapes through a channel or groove cut into the casing.

Once you’ve selected the right pump for your hdyraulic system, you need to consider your fluid choices. Synthetic, petroleum- and water-based fluids offer a variety of performance and environmental benefits.