SONA KOYO STEERING SYSTEMS LTD

Presented By Kuldeep Rajput

SONA KOYO STEERING SYSTEM

SONA GROUP

The SONA GROUP started in1987 & collaborated with KOYO SEIKO company of JAPAN.The location of its first plant was in GURGAON.The other plants at DHARUHERA, BAWAL & CHENNAI.

HISTORY OF SONA GROUP

GENERALThe purpose of the steering system is to allow the driver to control the direction of the vehicle by turning the front wheels.

There are two basic types of steering system MANUAL & POWER. in the MANUAL SYSTEM, the driver’s effort to turn the steering wheel is the primary force that causes the front wheels to turn to the left or right on the steering knuckles. with POWER STEERING, the driver’s turning efforts are multiplied by a Hydraulic assist.

STEERING SYSTEM

DIFFERENT TYPES OF STEERING SYSTEMS• Rack and Pinion Type• Re-circulating Ball Screw Type

MANUAL STEERING POWER ASSISTED

Hydraulic Power Electrically Assisted

Column Type EPS (CEPS)

Pinion Type EPS (PEPS)

COMPONENTS OF STEERINGSThe manual steering system incorporates a steering wheel, shaft, column, a manual gear box and pitman arm; drag link and knuckle arm, tie rod.

RACK & PINION TYPE STEERING

The rack-and-pinion gear set does two things: 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.

On most cars, it takes three to four complete revolutions of the steering wheel to make the wheels turn from lock to lock (from far left to far right).

The pinion gear is attached to the steering shaft. When you turn the steering wheel, the gear spins, moving the rack. The tie rod at each end of the rack connects to the steering arm on the spindle

WORKING OF R & P STEERING SYSTEM

Power Steering There are a couple of key components in power steering in addition to the rack-and-pinion or re-circulating-ball mechanism.

InOut

Left Turn

Right Turn

Right Turn Oil Flow

Left TurnOil Flow

Power Steering System (Rack & Pinion type)

The power steering system consists of:- Rack and pinion steering gear box- Power steering oil pump- Oil reservoir- TubesThe power steering system uses a hydraulic pressure which is generated by the power steering pump to re-duce the effort required to turn the steering wheel. The power steering pump is mounted on the front of the engine.The power steering fluid is drawn into the pump from the reservoir when the engine is running. The fluid is pressurized by a power steering switch and a control valve located in the power steering pump.

System construction

WORKING PRINCIPLE The engine driven hydraulic pump supplies oil at a pressure to a control valve (Pinion Valve Assembly) situated in housing that supports the pinion shaft.

The movement of steering wheel imparts movement to the control valve through the steering column.

The torsion bar moves the control valve, which in turn directs the oil to one side of the piston inside the steering housing( Cylinder Tube), depending on the direction of rotation of steering wheel.

The control valve is a rotary spool type valve controlled by the torsion bar inclosed in the steering case.

The amount of twist of the torsion bar an the movement of the spool valve is proportional to the effort applied by the driver on steering wheel in any direction.

Power Rack-and-pinion

Operation of the pinion and valve assembly (at the center position)

Operation of the pinion and valve as-sembly (turning left)

Operation of the pinion and valve as-sembly (turning right)

PINION & VALVE ASSEMBLY

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VALVE BODY

INPUT SHAFT

TORSION BAR

PINION SHAFT

PARTS OF PV ASSEMBLY

21

PRCESS FLOW OF VALVE BODY

I.D DEBURRING

TURNING SPLINE BROACHING SLIT BROACHING THREE WAY DRILLING

INDUCTION HARDENING

SLEEVE PRESSINGOD GRINDING

ID GRINDING SLIT GRINDING ID HONNING ID & OD BUFFING

I.D BUFFING

DIP TYPE WASHING

PASS HOLE PINNING

CRACK CHECK

FINAL WASHING

PRCESS FLOW OF TORSION BAR

Turning Serration Rolling Washing

O.D Grinding Straightening Induction hardening

Crack check Final Washing

PRCESS FLOW OF INPUT SHAFT

8-Slot machining Three drill pass hole Induction hardening ID. Deburring

Grinding Final washing

PRCESS FLOW OF PINION SHAFT

Raw material

Washing machine

Marking machine

Drilling Reaming machine

Pin pressing machine

Deburring machine

Crack Detection

Final washing

Induction hardening

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