Types Of Power steering Pumps

Types Of Power steering Pumps

Types Of Power steering Pumps

There are three types of power steering pumps: vane, roller and slipper. The vane type is the most popular.The difference between pumps used is the design of the fins that move the fluid within the pump to build pressure. All pumps use a rotor that spins inside the pump housing. With the vane type pump, the rotor turns inside an oval or elliptical housing. The vanes, fitted to the outside diameter of the rotor, ride against the housing walls as the rotor turns. Power steering fluid enters the oval housing and fluid is trapped between the vanes, housing wall and rotor. This causes a pressure increase that pumps fluid out of the housing through the outlet chambers.In roller type pumps, the housing's inside contour is also oval. Wide V-grooves are cut into the rotor. Steel rollers ride in these grooves and, like the vane

type, they follow the inside contour of the pump housing as centrifugal force pushes them out at the oval's end. The rollers trap fluid in the same way as the vanes and when they pass the narrow portions of the body, they pressurize the fluid and force it out through two outlets.Also rotating in an elliptical chamber within the pump body, the rotor of the slipper type pump has several wide slots cut into it fitted with springs topped by scrubber-type "slippers." The springs keep the slippers in contact with the pump body walls. The whole assembly resembles a spring-loaded hone spinning within an engine cylinder.

Power Steering Fluid This fluid is a specially formulated solution. It may be similar to automatic transmission fluid and may contain some of the same rust and corrosion inhibitors, but it is not the same. Power steering fluid is made to withstand higher temperatures. Power steering fluid must also be compatible with the rubber materials in hoses, pump seals, valves and cylinders. Blended to resist thinning at high temperatures, it usually contains a pour point depressant to maintain flow at temperatures as low as -20 F. The power steering system must be filled to the proper level with clean fluid at all

times to maintain precise steering action. The biggest enemy of power steering

systems is dirt and sludge in the fluid.

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