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PAGE 22 — HTN 31V
HHN 31V • RIDE-ON POWER TROWEL — OPERATION & PARTS MANUAL — REV. #5 (03/02/07) — PAGE 22
HHN -31V — MAINTENANCE
The HHN trowel is equipped with a "Torque Converter" which
supplies torque to both the left and right gear boxes.
The function of the a torque converter is to automatically deliver the
correct amount of torque required by the trowel under all load
conditions. This enables the trowel to deliver the necessary torque
for float pan applications and the high rotor speeds required for
burnishing concrete.
The torque converter used in the HHN series trowels is of the
variable pitch pulley type (Figure 14) connected by a drive belt.
Fig. 14. Torque Converter/Variable Pitch Pulley
Drive Pulley
The
"Drive Pulley"
uses centrifugal force (Figures 15 and 16)
to create a belt squeeze force transmitted at the pulley faces.
This condition functions as an automatic clutch.
Figure 15. Torque Converter (Centrifugal Force)
The "Variable Pitch Pulleys" have one
fixed face
, and one
moveable
face
. The
drive
pulley ( torque converter, Figure 17) moveable face
is controlled by roller weight arms and springs, which change
position according to engine speed. The
driven
pulley
moveable
face
is controlled by a spring and belt tension.
Fig. 17. Variable Pitch Pulley
Fig. 16. Pulley Interaction
As shown in Figure 16, centrifugal force pushes the roller arms (see
Figure 17 below) against the ramp plate, forcing moveable face
toward fixed face squeezing belt.