INNOVATIVE ENGINEERING DESIGNS TO SUIT UNIVERSAL APPLICATIONS
The polyurethane that is specifically blended for the SuperPro product has mechanical
properties that make it extremely successful in its application. The properties
of extreme resistance to abrasion, low compression set, high tear strength and a
resistance to oils and solvents make SuperPro’s polyurethane ideal for automotive
applications. These properties lead to a resilient product that is highly versatile
in its applications.
The crush tube is an integral component of the suspension
bush system and is necessary for free pivoting. The crush tubes are made to precision
tolerances to ensure that the precise fits are maintained.
Wherever an outer shell
or sleeve is used in the SuperPro product range you can be assured that it is also
made within precise tolerance ranges.
THE DOUBLE HELIX
The double helix is a design
feature that has lead to improvements in the SuperPro product. The double helix
is used in two applications. The first is on the inside of the bush and the second
is on the outside diameter of the crush tube.
The first design of the double helix
is used primarily on shackle bushes. The double helix provides a region for grease
to travel along. This allows a boundary layer of grease to form between the inside
diameter of the bush and the outside diameter of the tube. The double helix is extremely
successful in greaseable shackles as the grease can travel from the centre of the
bush along the helix and out to the grease grooves in the head of the bush.
Knurling is used on control arm bushes to enable unrestricted pivoting of the polyurethane
bush around the crush tube. The knurling has two inherent design advantages. The
knurling reduces the surface area of polyurethane in contact with the crush tube.
This reduction in surface area results in less frictional forces being developed.
The SuperPro knurl bore keeps the lubricating grease intact for the life of the
bushing, and eliminates the necessity for periodic re-greasing.
BULLET GROOVES AND
Bullet grooves are incorporated in the design of SuperPro bushes to allow
for variances in control arm or spring eyes.
The voiding and bullet grooves also
allow for the transgression of displaced polyurethane into the volume of the grooves
as load is applied during normal vehicle operation. Even though polyurethane is
in a solid form when it is manufactured into bushes, its unique properties enable
it flow in a manner similar to a liquid when loaded. The action of the bush flowing
into its voids prevents the generation of harshness and NVH within the bush and
TANGENTIAL GREASE GROOVES IN HEAD
The tangential grease grooves in the
heads of shackle bushes have reduced the friction between the head of the bush and
the shackle plates. The grooves store grease, which is smeared around the mating
surfaces when the spring shackles rotate forming a lubrication boundary layer. This
has the effect of minimising head friction and reducing noise.