
Chapter 1: Introduction
5
5.
DRIVE SYSTEM DESCRIPTION
•
A belt-type
CVT
(Continuously Variable Trans-
mission)
system carries power from the engine
crankshaft to the transfer case.
See Figure 1.10.
•
The CVT range provides strong torque and
acceleration, limiting speed to 25 MPH (40
KPH).
•
The driving clutch on the engine crankshaft uses
centrifugal force to operate a mechanism that
pulls the sheaves closer together.
The faster the engine spins, the closer the
sheaves get.
As the sheaves close-down on the belt, the belt
is forced outward.
As the belt is forced outward, the drive ratio
decreases so that fewer crankshaft revolutions
equate to more input shaft revolutions at the
input shaft of the transfer case.
NOTE:
A lower numeric ratio results is fre-
quently referred to as a “steeper” or “taller” drive
ratio, yielding in increased top speed.
•
As the effective diameter of the driving pulley
increases, the belt has less available length to
reach the driven pulley.
The sheaves of the driven pulley is spring-
loaded so that it can absorb the additional ten-
sion.
An additional effect is that the belt is drawn
deeper into the sheaves, reducing the effective
diameter of the driven pulley.
Reducing the diameter of the driven pulley fur-
ther reduces the drive ratio.
Figure 1.10
CVT driving element
CVT belt
CVT driven
element
•
The
transfer case
is mounted adjacent to the
engine, with the input shaft running fore-and-aft
in the frame. See Figure 1.11.
•
The transfer case contains two forward ratios,
neutral, and reveres.
•
Gear selection is controlled by rods and a selec-
tor lever sourced from Hurst®.
Drive shafts
with Hooke/Spicer type universal joints
extend fore and aft from the output shafts of the trans-
fer case to drive the front and rear differentials.
The
rear differential
has a cast iron housing and a
cable-actuated locking feature. See Figure 1.12.
Figure 1.11
Transfer
case
Figure 1.12
Differential lock
actuator
Rear differential
Содержание Volunteer 4x4 Utility Vehicle
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Страница 12: ...Chapter 1 Introduction 8 ...
Страница 66: ...Chapter 2 Drive System CVT and Transfer Case 62 ...
Страница 78: ...Kohler Enclosed CVT Addendum 74 ...
Страница 92: ...Caterpillar Enclosed CVT Addendum 88 ...
Страница 126: ...Chapter 3 Drive System Drive Shafts and Differentials 122 ...
Страница 278: ...Chapter 8 Caterpillar Engine and Related Systems 274 ...
Страница 318: ...Chapter 9 Electrical 314 Electrical Schematic Main Wiring Harness w Kohler engine 725 04351 725 04365 ...
Страница 319: ...Chapter 9 Electrical 315 Electrical Schematic Engine Harness w Kohler engine ...
Страница 320: ...Chapter 9 Electrical 316 Electrical Schematic Main Harness w Caterpillar engine 725 04327 725 04365 ...
Страница 321: ...Chapter 9 Electrical 317 Electrical Schematic Engine Harness w Caterpillar engine 725 04341 ...
Страница 322: ...Chapter 9 Electrical 318 ...
Страница 323: ...1 Front Drive System Differential Gearcase P N 6203 01 280 Parts and Service Manual Rev 0 Released 1 16 2012 ...
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