Posted by :
Ray Wakefield -
and front suspension.
requires some explanation, as the method of steering is a little unusual.
It is identical on both Maximum Impulse and Motivator and is generally
known as centre hub steering.
Components of centre-hub steering.
most things in motorcycling it is not new, and was certainly in use
on one motorcycle in the second decade of the last century. It was
to be found on the Ner-a-car of the thirties, and later in a more
sophisticated form on the Elf endurance racer, John Renwick's
"Wedge" sidecar racer, and several "feet first"
motorcycles produced by Jack Difazio and Royce Creasey, to name but
a few. As
the steering takes place within the hub of the wheel, there is no
requirement for any type of conventional fork arrangement or
steering head. This then allows for minimum height and for all
steering and (where fitted) braking forces to be fed back directly
into the chassis by nothing more sophisticated than lightweight
tubular links and spherical rod ends (rose joints). It's only
disadvantage, apart from the aesthetic one, is a restricted steering
lock. This is immaterial in a record contender.
Partly assembled axle assembly.
steel wheel spindle carries a king-pin perpendicular to its axis
across its centre. This has a taper roller bearing on either side,
the outer races of which are retained in a substantial transverse
bearing carrier by large nuts. The
inner diameter of the bearing carrier is of sufficiently size to
allow it to rotate about the king-pin through, in this case, five
degrees from the central, or co-axial plane. The bearing carrier
supports the inner races of a pair of angular contact wheel
bearings, and at one extremity is coupled to a steering yoke via a
collar, which is a floating fit against a large spindle nut. The
outer races of the wheel bearings are a press fit into machined
retainers which are in turn bolted into the hub of the wheel. The
components that make up this assembly are illustrated above.
pin through the axle in the lower left of the above picture mates with an
adjuster on the swing arm to permit easy alteration of king-pin angle by
rotation of the whole assembly.