Suzuki Intruder 1978 - Page 47

The ramp is designed so the shift pattern is within
the peak torque curve of the engine . The ramp pro-
file is the major factor in determining the charac-
teristics of the shift pattern.
Driven Converter
The power that drives the track is transmitted from
the drive converter through the T.C. belt to the
driven converter. The driven converter is held
closed
by the driven torque converter spring . This
positions the belt at idle, or w it h the engine off at
the outside circumference of the driven flanges .
Spring positioning between the fixed sheave and
ramp cap is variable which changes the preload
(twist) of the movable sheave. If the engine RPM at
40 mph is 5,000, then winding the spring tighter
will raise the RPM at the same vehicle speed.
Reducing spring
twist will result in lower RPM at
the same vehicle speed.
1. Spring
2. Ramp
3. Movable Sheave
4. Drive
Belt
5. Stationary Sheave
F
igure 2-38
Spring twist is controlled by placing the tab on
each end
of the spring in one of the hole
selections
provided in the ramp cap and fixed
sheave.
(See Figure 2-39 .)
As
the engine speed increases the sheave as-
sembly is spread apart allowing the belt to ride on
a
smaller diameter of the flanges. This change of
flange diameter varies the drive ratio, auto-
matically providing the most favorable ratio be -
tween the drive and driven converter for the speed
and
load at which the machine is operating. (See
Fi gure 2- 38 .)
The driven converter has torque sensing
capabilities accomplished through the design of the
ramps on the fixed sheave and ramp cap. The
angle of the ramps will change the torque sensing
capabilities of the driven converter . The driven con-
verter compares the amount of engine torque to
track load, and shifts the converter into the best
overall ratio for the conditions existing at that time .
"
t
•
1. Holes in Fixed Sheave
2.
Holes in Ramp Cap
Figure 2-39
Chaincase and Gearing
The chaincase provides a mounting for the RH end
of the jackshaft and the front driveshaft. The drive
sprocket, drive
chain, and driven sprocket are
housed
within the sealed housing which contains
lubricant for the drive chain. (See Figure 2- 40 .)
The upper (drive) sprocket in
the chaincase is
attached by splines to the jackshaft. The lower
driven sprocket is attached to the track driveshaft
by splines. The drive chain transfers power from
the driven converter to the track driveshaft.
THEORY OF OPERATION 2-27