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Illustration-2 Shows such a steering linkage. The drop arm (Pitman Arm) is rigidly connected to the cross-shaft of the steering gear at its upper end while its lower end is connected to the link rod through a ball joint. To the other end of the link rod to the other end of link rod is connected to the link arm through a ball joint. Attached rigidly to the other end is the stub axel on which the road wheel is mounted. Each stub axel has a forged track rod arm rigidly bolted to wheel axis. The other end of the track rod arm is connected to the track rod. The steering gear provided mechanical advantage so that only a small effort is required at the steering wheel to provide a large force on the steering linkage. When the steering wheel is turned, the swinging action of the drop arm imparts a liner movement to the link rod. This movement is transmitted through the link rod arm to the stub axel so as to turn the later about its pivot, which is the king pin. The other wheel is steering through the track rod. Large amount of torque is applied by the driver for steering. Hydraulic power steering provides automatic assistance to turning efforts applied to the manual steering system with the help of hydraulic fluid. The system is designed to become operative when effort at wheel exceeds a predetermined value, say 10 N. These systems operate by fluid under pressure as high as 7 Mpa. The principle of working of all power steering system is same. The slight movement of the steering wheel actuates a valve so that fluid under pressure from reservoir enters the appropriate side of the cylinder, thereby applying pressure on one side of the piston to operate the steering linkage, which steers the wheel in the appropriate direction. The main component of internal power steering system consists of a hydraulic pump assembly and a steering gear assembly connected by means of hoses. A rotary valve power steering gear for internal systems uses re-circulating ball type worm and wheel steering...

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