Slide 1: Power Steering System In
Vishal V. Chitare
Don Bosco Institute of Tecnology.
Bangalore. Slide 2: Introduction.
General Circuit .
Component In Power Steering.
Types of HMPS.
Future of Power Steering.
Advantages and Disadvantages.
Conclusion. Power Steering Introduction : Introduction Steering is the term applied to the collection of components, linkages, etc. which allow for a car or other vehicle to follow a course determined by its driver. History of Hydro-mechanical Power Steering (HMPS) : History of Hydro-mechanical Power Steering (HMPS) Hydro-mechanical power steering was the first type to be used on agricultural tractors in the early 1950’s.
Suitable for small to medium tractors where power steering can be an option to manual steering.
Once the size of the tractor becomes too big for manual steering, hydro-mechanical steering is usually not cost effective. General Circuit : General Circuit Oil Reservoir
Must be large enough to hold more than all of the oil for the system.
Should be capable of dissipating heat in oil.
Flexible hoses due to the steering components movements. General Circuit : General Circuit Filters
Preferably installed in the return line.
A 10-micron or smaller filter is recommended.
Air Breather Filter
The “breather” or vent in the reservoir.
A 3-micron filter is recommended. Components in Power Steering : Components in Power Steering Pump
Linkages Components in Power Steering : Components in Power Steering Power Steering Pump
Usually a vane-type pump or similar.
Driven by the engine.
Double-acting differential cylinder.
Steering response to left and right turns is slightly different. Hardly noticeable. HMPS Type 1The integral valve and actuator coupled to steering linkage. : HMPS Type 1The integral valve and actuator coupled to steering linkage. Easiest to adapt to an existing mechanical steering layout.
Only two hoses are neede HMPS Type 2Steering column mounted control valve with separate, remote actuator coupled to a linkage member. : HMPS Type 2Steering column mounted control valve with separate, remote actuator coupled to a linkage member. Creates a highly congested area with all of the hoses.
Four Hoses are needed: supply, return and a pair to the actuator.
Creates noise, heat and vibration HMPS Type 3Control Valve and actuator separately mounted in the steering linkage. : HMPS Type 3Control Valve and actuator separately mounted in the steering linkage. Keeps the area around the steering wheel from becoming too congested.
Four hoses are required. HMPS Type 4The control valve and the actuator are mounted on the steering column, the actuator drives the pitman arm by rack and pinion or by crank arm means. : HMPS Type 4The control valve and the actuator are mounted on the steering column, the actuator drives the pitman arm by rack and pinion or by crank arm means. Most sophisticated design
Requires little or no steering linkage modification.
Requires larger space envelope than other types. Vane Type of Pump : Vane Type of Pump ROTARY VALVE : ROTARY VALVE Split Gears : Split Gears It converts the rotational motion of the steering wheel into the linear motion needed to turn the wheels.
It provides a gear reduction, making it easier to turn the wheels. Steering Gear Box : Steering Gear Box Steering gears are enclosed in a casing known as steering gear box ( as shown in Fig.) Recirculating-ball Steering : Recirculating-ball Steering The first part is a block of metal with a threaded hole in it.
Works similar to a bolt that sticks into the hole in the block.
These are used in havy duty comurcial vehicles. ` Power Rack-and-pinion : Power Rack-and-pinion The Future of Steering - Drive by Wire : The Future of Steering - Drive by Wire As the majority of today’s hydraulic power steering systems are designed to have the steering pump running constantly, pumping fluid around the system, it wastes valuable horsepower, which translates into wasted efficiency and therefore fuel.
One concept is the "steer-by-wire" or "drive-by-wire" system. These system would completely eliminate the mechanical connection between the steering wheel and the steering, replacing it with a purely electronic control system. Advantages : Advantages Preventing the wheels from transferring the load to the steering column
Reducing the driver’s fatigue
Low input torque and continuous steering function
Oil output directly proportional to the steering speed Disadvantages : Disadvantages Design is compications and increased in cost.
Fluid leakage. Conclusion : Conclusion By studing all these we can conclude that the power stering is nesessory for the modern cars.
Now a days we can see almost all cars having a power steering.
It provides good handling to the driver, gives better comfert, and make him less fatigue. Power Steering : Power Steering Thank you