WÄRTSILÄ Vasa R22, Instruction Manual

Page: 135 / 297

16 Connect the hoses,
and proceed with tightening of con-
necting rod nuts.
11.3 Balancing mechanism for 4-cylinder
engines
The four-cylinder in-line engine is equipped with two balancing
shafts (3) which rotate at a speed twice the crankshaft speed. The
shafts are driven by the crankshaft (1) through an intermediate
gear (2). Each shaft is pivoted in four pressure lubricated sliding
bearings (4), one of which is axially guiding. The counterweights
are integrated into the shaft.
Normally, the arrangement needs no maintenance. In connec-
tion with overhauls of the engine the sliding bearings can be
inspected. In case the transmission has been opened it is abso-
lutely necessary to make sure that the marks of the gears remain
in their initial positions.
4R22, 4R22/26 balancing shaft
The second-order free forces of the 4-cylinder in-line engines are
completely counterbalanced by means of an arrangement consist-
ing of two balance shafts with eccentrical masses, rotating in
opposite directions in relation to each other. The shafts rotate at
a rate of twice the engine speed. The centrifugal forces counteract
each others horizontally and counterbalance the free forces of the
engine vertically, Fig 11-3.
9
1
2
4 4 4 4
Section of
bearing halves in
vertical position
1. The crankshaft
2. Intermediate gear
3. Balancing shaft
4. Bearing
12 11
10
13
7
8
6 5
3
14
Fig 11-3
2211559205
22-9601 Crank Mechanism 11
VASA 22 11 - 9