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Page discussing the self-centering characteristics of steering systems, with diagrams illustrating pivot types and force moments.


Identifier  ExFiles\Box 178\1\  img110
Date  13th July 1926 guessed
  
- 11 -

SKETCH B.
VERTICAL PIVOT.
LONGITUDINALLY RAKED PIVOTS.

(e) Self-Centering.

We have already pointed out two features on a conventional steering system which tend to promote self-centering. Of these by far the most important is the castoring action obtained by longitudinal inclination of the pivots. In addition, however, if absolutely vertical pivots were employed without centre-point steering, the car

SKETCH C.
SELF CENTRING VERTICAL PIVOTS
No CASTOR

DIRECTION OF MOTION

MOMENT OF ROLLING RESISTANCE FORCE F ABOUT N.S. PIVOT = x Cos α
MOMENT OF ROLLING RESISTANCE FORCE F ABOUT O.S. PIVOT = x Cos β
AND ANGLE β > ANGLE α ∴ Cosβ < Cosα
RESTORING COUPLE TENDING TO SELF CENTRE THE STEERING IS
x(Cosα - Cosβ).
  
  
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).


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