TM 5-3810-307-24-1-2
3.2
Steering Systems with Mechanical Steering-Lock Limitation
3.2.1
Function
Eight inner drivers (143) each with two external protruding stops are pushed up to their respective
shoulders or circlips (154) on the steering spindle (93) or bevel gear (331) of a right-angle type
gear. These drivers can turn in the opposite direction to the spindle. The last driver (148) has two
external protruding stops and is splined so that it mates rigidly and turns with the steering spindle.
In turn, this ring is followed by another eight rotating inner drivers (145) each with two external
protruding stops.
All the rings are held together with axial play by the end flange (151) and the centering ring (346).
A special intermediate flange (95) above these inner drivers carries another sixteen outer drivers
(147), arranged eight on each side of a spacer (144) and each of which has two internal protruding
stops. These drivers rotate and each outermost ring contacts an adjuster ring (146). The spacer is
centered above the carrier (148) and is thinner than the latter by the width of an inner or outer
driver. Hence, the outer drivers which contact the spacer protrude above the carrier (148) to a
distance equal to half the width of a ring, with the result that when the spindle is rotated, the
protruding stops of the carrier which also turns are made to contact those of the first outer rings.
Since inner and outer drivers are of the same width, these rings are also offset by a distance equal
to half the width of a ring and when the angle of rotation is correct the protruding stops of each ring
meet those of two opposite rings.
When steering spindle and steering wheel are turned with the carrier (148), the protruding stops of
this driver soon meet these of the protruding outer drivers (147). These two outermost rings are
now made to turn as well until their protruding stops meet those of the first inner driver, causing the
latter to turn. Further rotation means that the latter turns the next outer ring and so on, until the last
inner drivers contact the protruding stops of the adjuster rings (146). The adjuster rings are rotate-
able, but are engaged by the stud bolts (152) in such a way that they can be fixed in any position in
the intermediate flange, thus limiting steering lock separately for each side. The design is such that
each adjuster ring can act as a stop in only one full-lock position of the steering. To permit
adjustment of steering lock, the adjuster rings can be moved and repositioned from outside without
difficulty.
Legend for Figure 5
a1
Upper Stud Bolt (152)
a2
Upper Adjuster Ring (146)
b1
Lower Stud Bolt (152)
b2
Lower Adjuster Ring (146)
Figure 5. Longitudinal Section through the
Mechanical Steering-lock Limiter Stud Type
H-14 Change-1
