Power steering was introduced in the 1950s and quickly became an automotive standard. Currently, the most used version of power steering is the hydraulic steering system. These are generally used to reduce steering effort and turn over sharp corners.
In this guide, we will provide you with complete information regarding the anatomy and working of hydraulic steering systems.
Hydraulic Power Steering System
The concept of the hydraulic power steering system is not new, it was invented almost a century ago. However, the original version was different than hydraulic system used these days and was mostly preferred for heavy vehicles. The modern hydraulic system uses fluid and hydraulic pumps to increase the torque of steering, reducing effort and helps steering wheel to return to center.
We have enlisted complete detail about hydraulic power steering in the following paragraphs.
Background
Francis W. Davis invented power steering in the 1920s. His steering system works on nut and ball to provide higher sterling force; it is still used in heavy vehicles. The first hydraulic power steering was introduced in sports cars during the 1960s. Its working was based on rack and pinion. This concept is still dominant in modern hydraulic steering systems with modifications.
Components
The latest hydraulic steering system is an amalgamation of the basic steering system and hydraulic technology. It consists of a closed hydraulic cylinder in which hydraulic fluid flows. The main components of the system are:
- Hydraulic cylinder
- Hydraulic pump
- Valve
- Steering gearbox
- Oil reservoir
Working Principle
The hydraulic power steering system works on a hydro-mechanical servo. It is a system that applies force in a similar direction as the driver, but with greater torque. This increased torque multiplies the steering input exerted by the driver making movement smoother. See the working principle of the hydraulic steering system in the sequential manner mentioned below.
- When the driver rotated steering, a hydraulic pump attached with the engine shaft started pumping hydraulic fluid from the oil reservoir into the hydraulic chamber.
- This hydraulic pressure exerts pressure on the cylinder piston enclosed within the chamber.
- The high pressure fluid rotates the pump shaft, rotor and vanes inside the cam ring of the hydraulic chamber. These rotating elements increase the torque of steering by 90%.
- The high-pressure fluid in the hydraulic cylinder is applied to the pinion which transfers it to rack gear and ends at the rotating front wheel. The transfer of high torque from the pinion to the front wheel is based on a coupling mechanism.
Hydraulic Steering System and Vehicle Handling
The hydraulic steering was introduced to reduce the torque of the driver, not to end it completely. Along with the reduction of torque, the steering system is also responsible to transfer some road feel to the driver. These two characteristics are required to be balanced for an adequate and convenient driving experience. For this, car manufacturers use the assistance ratio of hydraulic power steering with front-wheel suspension to provide a steep gradient of turning vehicles. This is one of the most important characteristics of a power steering system. Without this, the drivers can lose physical and mental coordination ending up in accidents.
In the hydraulic steering system, this ratio is perfectly balanced. Therefore, drivers can feel and turn the car around the corner more conveniently.
Additional Maintenance
The hydraulic steering system is often criticised for additional maintenance and the oil it uses. The majority of energy wastage occurs when the steering is used at high speed and surplus oil is generated. However, embedding a hydraulic steering system with an advanced algorithm that releases a limited amount of oil can be the ultimate solution. Therefore, the majority of modern vehicles have electric steering systems which are more energy-efficient contrary to other systems.
This was all about the hydraulic steering system in cars. Since the introduction of electric system, the debate of electronic Vs hydraulic system has been initiated. The modern and updated electronic steering system is one of those systems which has potential to replace the hydraulic system. If you want to experience a new steering system, browse through these used cars for sale in the UAE.
Stay tuned to UAE’s top auto blog for more information on the steering system.
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