Yanmar 4JH2E Service Manual page 216

Chapter 7 Reduction and Reversing Gear
I. Con.struction
4JH2-Series
Marine Gear Model
KBW20/KBW21
1. Construction
1·1 Construction
The Kanzaki-Carl Hurth KBW20 and KBW21 re-
duction reversing gears were developed jointly by
Kanzaki Precision Machine Co., Ltd., a subsidiary
of Yanmar and one of Japan's leading gear manu-
facturers, and Carl Hurth Co.
The KBW20 and KBW21 consist of a multi-disc
clutch and reduction gear housed in a single case.
They are small, light, simply constructed and
extremely reliable.
•The force required to shift between forward and
re verse can be controlled by a cable type remote
1 ·2 Specifications
Engine model
Marine gear model
Reduction system
Reversing system
Clutch
Reduction ratio
Diection of rotation
Lubricating oil
Lubricating oil capacity
Prlni,ed in Japan
AOAI029-9109SP
Forward
Reverse
Input shaft
Output shaft:
Forward
Reverse
7-1
control system much smaller and simpler than other
types of reduction reversing gears.
•The friction discs are durable sinter plates, and
the surface fo the steel plates are corrugated in a
sine curve shape to ensure positive engagement and
disengagement and minimum loss of transmission
force.
•Because of the special construction of this gear,
the optimum pressure is automatically applied to
the clutch plate in direct proportion to the input
shaft torque.
4JH2E
I
4JH2-TE
KBW20
One-stage reduction, helical gear
Constant mesh gear
Wet type multi-disc, mechanically operated
2.17
I
2.62
I
3.28
I
2.17 I 2.62
I
3.28
3.06
I
3.06
Counterclockwise as viewed from stern
Clockwise as viewed from stern
Counterclockwise as viewed from stern
DEXRON, ATF
1.22