10.00 R20 OR822 16PR A 10.00 R20 OR822 New Tyre by revolving 949 - - PowerPoint PPT Presentation

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Apr 24, 2023 254 likes •351 views

10.00 R20 OR822 16PR A 10.00 R20 OR822 New Tyre by revolving 949 times Per Km Revolves 949 times If the Wheel misaligned by 3mm per 1km only Then . 3mm out of line x 1. You cant feel it 949 revolutions = 2. 3mm

SLIDE 1

SLIDE 2

A 10.00 R20 OR822 New Tyre by revolving 949 times Per Km If the Wheel misaligned by 3mm

Then . 1. You can’t feel it 2. 3mm misalignment x 949 rev’s = 2847 mm Which means that every km tyre is Being forced over 2.85 meters (> 9 feet) sideways whilst rotating No wonder it wears out the shoulder

10.00 R20 OR822 16PR

– Revolves 949 times per 1km – 3mm out of line x 949 revolutions = 2847mm – Tyre is dragged >9 feet sideways every 1km

SLIDE 3

TOE - IN IS WHEN BOTH FRONT WHEELS ARE CLOSER TO EACH OTHER WHEN VIEWED FROM THE FRONT

FRONT TO VEHICLE

“NOTE THE FEATHER EDGE WEAR” EXCESSIVE TOE-IN WEARS THE OUTSIDE OF THE TYRE

SLIDE 4

FRONT TO VEHICLE

EXCESSIVE TOE-OUT WEARS THE INSIDE OF THE TYRE

“NOTE THE FEATHER EDGE WEAR”

TOE - OUT IS WHEN BOTH FRONT WHEELS ARE FAR AWAY FROM EACH OTHER WHEN VIEWED FROM THE FRONT.

SLIDE 5

AS ILLUSTRATED IN THE PICTURE YOU COULD FIND SMOOTH SLOPED WEAR ON THE INSIDE EDGE OF THE TYRE NEGATIVE CAMBER IS WHEN BOTH FRONT WHEELS ARE CLOSER TO EACH OTHER WHEN VIEWED FROM THE TOP NEGATIVE CAMBER

SLIDE 6

POSITIVE CAMBER IS WHEN BOTH FRONT WHEELS ARE FAR AWAY FROM EACH OTHER WHEN VIEWED FROM THE TOP AS ILLUSTRATED IN THE PICTURE YOU COULD FIND SMOOTH SLOPED WEAR ON THE OUTSIDE EDGE OF THE TYRE

POSITIVE CAMBER

SLIDE 7

Caster angle is the backward tilt of the axle, or inclination of the king pin at the top, which makes the wheel draw and automatically adjust, depending on the direction of track. INCORRECT CASTER CAUSES THE WHEEL TO BE PULLED TO ONE SIDE RESULTING IN SEVERE AND IRREGULAR TREAD WEAR

SLIDE 8

It is the angle of the steering axis, relative to the road surface, as illustrated. It stabilizes the wheel at the neutral position and assists in a self-centering action to be generated.

LOOSE KING PIN RESULTS IN FAST AND UNEVEN TREAD WEAR

King Pin Inclination

SLIDE 9

Steering set back is the “set back” of one wheel when compared with the other on the axle. It means one wheel is slightly behind the other, instead of being in line with it. THRUST ANGLE It is the angle between the geometric centerline & the thrust line due to mis-alignment of the axle as shown in the figure. VERY COMMONLY DETECTABLE IN COMMERCIAL VEHICLES

THRUST ANGLE

NEGATIVE POSITIVE

THRUST LINE