Catálogo DirtFreak 2020

CRF450L
FRONT
NINJA ZX-10R
FRONT
WR250R
REAR
CRF250L
REAR
NINJA ZX-10R
REAR
AXLE SHAFT
LIGHT WEIGHT
The specific gravity of Ti-6AL-4V is about 4.4. This is about 56
% with respect to the specific gravity of 7.8 of stock axle shaft
using iron( SS400 ) and carbon steel ( S45C ), or chromium
molybdenum steel shaft ( SCM440 ). This means that if you
manufacture the axle shaft with the same mass, 64 titanium will
be able to produce about 44 % reduction in weight. The reduced
weight of the axle shaft also reduces the unsprung weight and
corner approaches will improve the handling and stability. In
addition, the reduction of unsprung weight will not only improve
the movement of the suspension, but also improve brake performance.
SIGNIFICANT LIGHT WEIGHT
TITANIUM AXLE SHAFT
ULTRA STRENGTH
Strength of Ti-6AL-4V is comparable to chromium molybdenum
steel ( SCM435 ) 900 - 930 Mpa. With the
higher strength axle shaft, you will be able to feel more
road surface information more directly. You will be able
to sense the bumpy road that could not be felt until
now.
BENDING
The Young’s modulus ofTi-6AL-4V is about half of iron and
chromium molybdenum steel at 106 Gpa. The Young's modulus
represents the rigidity and elasticity, the higher the number, the
higher the rigidity. Generally, one thinks "high-strength = high
rigidity,” also 64 titanium has been taken for granted as high
rigidity, but actually it is only half the rigidity of iron. Therefore
it is easily deformed, but there is elastic deformation where a
material tries to return to it’s original state, and plastic deformation
where deformation is permanent. 64 titanium has a wide
range of elastic deformation. In other words this is "BENDING".
It is this bending that produces the suspension effect, and high
strength that softly transmits road surface information.
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Not only Light. Not only strong. Not only flexible. If it is made of aluminum or magnesium
it will be lighter than 64 titanium but it will lack strength. If it is made of
chromium-molybdenum steel and nickel-chromium steel it will be stronger than
64 titanium, but it will be heavy. There is also materials having Young's modulus
lower than 64 titanium, but it will not mean that there is "BENDING.” 64 titanium
is superior to a balance of these materials. Therefore it may be said that it is the
best material for the axle shaft.
Also we must not forget the appearance of titanium. It more difficult to rust than
stock shaft and chromium-molybdenum steel shaft that has a protective surface
treatment. However, it does not escape corrosion where the surface is compromised
for some reason. Ti-6AL-4V forms a passive film surface to prevent
semi-permanent rust to form.
Material
Material symbol and heat treatment
Tensile
strength
(T/Mpa)
Young's
modulus
(E/Gpa)
Specific
gravity
Rolled steel for general structure SS400(Annealing) 450 206 7.87
Carbon steel for mechanical
structure
S45C(Normalizing) 570 or more 205 7.83
Chromium-molybdenum steel SCM440(Tempering quenching) 980 or more 206 7.86
Austenitic stainless steel SUS304(Solution treatment) 520 or more 197 7.93
Pure aluminum A1085 P(Annealing) 55 69 2.70
Duralumin (aluminum alloy) A2017 P(Natural aging) 355 69 2.79
Ultra duralumin (aluminum alloy) A2024 P(Natural aging) 430 74 2.78
Extra Ultra duralumin
A7075 P(quench-and-temper) 573 72 2.81
(aluminum alloy)
Pure titanium (JIS grade1) TF270 275-412 106 4.51
Pure titanium (JIS grade 2) TF340 343-510 106 4.51
Pure titanium (JIS grade 3) TF480 481-618 106 4.51
Titanium ( alloy) Ti-5AL-2.5Sn 850 118 4.48
Titanium ( alloy) Ti-6AL-4V 900 106 4.43
Titanium ( alloy) Ti-15Mo-5Zr-3AL 1470 75-95 4.80