|Explore Topics of Power Steering Pump
A hydraulically operated device that reduces the steering effort and makes a turn and also helps in easy maneuvering the vehicle is known as a power steering pump.
A power steering pump is used to reduce the driver effort for better ride-comfort and quick responsive steering.
The phenomenon of hydraulics is used to run the power steering pump for pushing the fluid into the steering gear box. This fluid under pressure assists the turning of wheels of the vehicle. On turning the steering wheel, small ports open up in the steering shaft, providing high amount of pressure causing the shaft to turn to further turn the wheels.
Since the power steering pumps are essentially positive displacement pump, the power developed by the pump is directly proportional to the engine speed and as such maximum hydraulic power will be transmitted to the steering wheel when the engine speed is high. However this is not desirable and for this reason there is a restricting orifice as well as a flow control valve which helps in getting back the excess hydraulic pressure back to the fluid reservoir. The use of pressure relief valve ensures that extreme pressures are not reached when the pump piston compresses the fluid completely.With developing technologies, modern hydraulic pumps are also included with electronic control valve which varies the hydraulic power according to the engine speed. There is also a provision for steering booster which helps to use the steering even when the hydraulic system fails. However it becomes very difficult to maneuver the vehicle with a failed power steering pump. For this reason, the vehicle manufacturers always insist to check the fluid levels regularly. The fluid or oil used in this system is based on mineral oil.