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JOURNAL BEARING APPARATUS |
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DESCRIPTION :
The apparatus consists of a plain steel shaft encased in a
bearing and directly driven by a small electric motor. The
bearing is freely supported on the shaft and sealed at the motor
end.
The motor speed is precisely controlled and adjusted by
specially designed control unit and can be run in both the
directions.
The bearing contains twelve equispaced pressure lappings around
its circumference and four additional ones along its topside and
on a vertical radial plane. All are connected by light and
flexible plastic tubes to the rear manometer panel so that
pressure head of aoil at all sixteen points can be clearly
observed at all times.
Oil is supplied to a low pressure region at both ends of the
bearings by an adjustable resevoir fitted at the side of the
rear panel.
The bearings can be loaded by attaching various weights to the
arms supported beneath it.
A label is conveniently provided at the front of the apparatus. |
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SPECIFICATIONS : |
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Journal Bearing -- 70mm dia
(Nominal) 75mm dia.
Weights -- 4 adjustable weights.
Recommended oil -- SAE 10
Motor -- D.C. shunt wound Speed range 500-3000 m rev/min
in both the directions
Control Unit -- Special design.
Manometer Panel -- 18 tubes mounted on a wooden back board |
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FEATURES : |
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• Pressure
profiles along and around the bearing continuously monitored on
large manometer panel.
• Theoretical pressure profile (Sommerfeld Analysis) an be
carried out and compared with practical results.
• Wide range of speeds and loads possible
• Ideal for group studies and demonstrations.
• A. C. single phase F.H.P. motor is used with a speed control
unit.
• Manometer height of 2-3m, provided for specialised low
clearance bearing studies (according to order) |
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RANGE OF
EXPERIMENTS : |
1) Simple Demonstrations
Observation of the pressure profile at the various conditions of
load and speed
2) Expermintal Investigation :
After noting the pressure profile for any chosen conditions the
following analysis may be conducted.
a) Plotting the cartesian and polar pressure curves.
b) Plotting the theoretical Sommerfeld curves
- K sin(2 + ncos)
P – Po = ------------------------
( 1 + ncos)2
SERVICE REQUIRED :
A.C. Single phase 230V 50Hz. Electrical supply.
INSTRUCTION MANUAL :
A Technical Manual accompanies the apparatus. The
details the equipment and test procedure. |
