A wheel alignment system measures caster and steering axis inclination (SAI) by positioning the wheels at a right turn position and a left turn position. However, zero scrub radius, under hard braking, causes the suspension to be skittish because varying road conditions created varying amounts of torque (both positive and negative) around the steering axis. This angle is known as the king pin inclination.
8-51) is the angle away from the vertical, formed by the inward tilt of the kingpin, ball joints, or MacPherson strut tube. On current suspension systems, the kingpin is set at an angle to the vertical plane when viewed from the front or rear of the vehicle. if you want to calculate steering ratio then consider the number of teeth given on rack and pinion. The larger the KPI, the larger the effect. Toe, camber and inclination angle measurements are made for both wheels at both the left turn position and the right turn position. KPI – Kingpin angle, scrub radius & wheel centre offset Kingpin angle is a measure of the angle of the suspension steer axis relative to vertical in front view. Based upon these measurements, caster and SAI are calculated either directly or through an iterative technique. The inclination of the steering axis is measured as the angle between the steering axis and the centerline of the wheel. Diagnosing A Bent Steering Knuckle Using Alignment Data Continued From Page 1 is to measure from a straightedge Many translated example sentences containing "steering axis inclination" – Dutch-English dictionary and search engine for Dutch translations. ... at the actual (Before) steering axis inclination (SAI) measurement on the alignment report. Steering axis inclination (SAI) (fig.
Steering Axis Inclination . When performing steering angle diagnostics, it is not easy to verify if a steering knuckle is damaged. Steering axis inclination is always an inward tilt regardless of whether the wheel tilts inward or outward. The steer axis (or kingpin axis) on a conventional double wishbone suspension passes through … Therefore, some amount of scrub radius, positive or negative, is preferred. The purpose of the KPI is to produce vertical displacement of the vehicle in during steering in an upward direction. This means that if the camber angle is adjustable within the pivot points the scrub radius can be changed, this alters the width and offset of the tires on a vehicle.
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