Power take-off
93
Extra V-belt pulleys
In order to calculate speed and diameter, the follow-
ing formula can be used:
RD × N = rd × n
RD = The driving belt pulley pitch diameter
rd = The driven belt pulley pitch diameter
N = The speed of the driving shaft
n = The speed of the driven shaft
The pitch diameter is given in the catalogues of the
pulley belt suppliers.
Front end V-belt pulleys
Belt pulley on crankshaft
Extra belt pulleys are available for bolting to the front
end of the crankshaft.
Information regarding Volvo Penta standard front end
pulleys is published with its dimensions in the
Sales
Guide Marine Propulsion Diesel Engines.
Direction of the side loads
The engine can usually accept a greater side load
below the crankshaft than above. Where this is the
case the belt drive should be arranged, if possible,
so that the driven equipment is below the crankshaft
centre line.
F
F
F
If two or more belt drives are required and can be ar-
ranged in opposite directions, the effects will tend to
cancel each other out and minimise the overall side
load on the crankshaft.
Unsupported power take-off
pulley
When it is essential to have an unsupported power
take-off pulley, the design can be checked and ap-
proved by Volvo Penta.
The following information must be provided:
. The engine specification
2. A drawing of the drive arrangements which should
include the following:
a. the effective diameter of all pulleys in the system.
b. the distance of the power take-off belt(s) from the
front or rear face of the cylinder block.
c. the number, size and type of belts used.
d. the position of the driven equipment in relation to
the engine.
e. the method of tensioning the belt(s), for example,
adjustable fixed pulley, spring loaded jockey pul-
ley, etc.
f. the maximum and continuous power requirements
of the equipment.
Summary of Contents for D11 series
Page 1: ...Marine Propulsion Diesel Engines Installation 1 1 D E D5 D16 series ...
Page 2: ......
Page 208: ...206 References to Service Bulletins Group No Date Concerns ...
Page 209: ...207 Notes ...
Page 210: ...208 Notes ...
Page 212: ...7748655 English 11 2007 ...