Home           Products           Company           Contact us     
> Statics
> Strength of Materials
> Dynamics
> Fundamentals of Engineering Design
> Machinery Diagnosis
> Properties of Materials
Products  |  Engineering Mechanics and Machine Elements  |  Fundamentals of Engineering Design  |  TM 290
TM 290 Hydrodynamic Bearing Apparatus Show data sheet (pdf file) Print page
Technical Description

The behaviour of a classical journal bearing with hydrodynamic lubrication can be investigated with the apparatus TM 290. The experimental capability ranges from the measurement of friction torque under load, to determine the pressure distribution in a journal bearing, to plot a locus curve of a journal and to determine the bearing attitude for different conditions of load and speed. The radial load of max. 500N is adjusted manually with a hand wheel. The drive is an asynchronous motor with frequency converter. All variables (speed, load, friction torque, oil supply pressure, oil peak pressure, oil temperature, X-displacement, Y-displacement) are indicated on 4-digit displays. Five different journals are used to examine bearing clearance. X and Y positions are measured using inductive displacement sensors. The friction torque is measured by means of a lever arm equipped with an electronic force sensor.


Learning Objectives / Experiments
- Determination of the coefficient of friction at various
  loads and speeds (also refer and compare to
  Stribeck curves)
- Influence of speed, bearing clearance and bearing
  load on the center of the journal
- Influence of speed, bearing load and lubricant on
  the friction torque
- Locus curve of a journal
* Measurement of friction torque under load1
* Pressure distribution in a journal bearing1
* Locus curve of a journal1
* Bearing attitude for different conditions of load and
* Investigating different bearing clearances with
  journals of a shaft of different diameters
Alternative products
TM 260.06 -- Experimental Module Journal Bearing Pressure Distribution
TM 280 -- Journal Bearing Apparatus
TM 282 -- Journal Bearing Friction Apparatus

[1] Mobile unit to investigate friction in a hydrodynamically lubricated journal bearing
[2] Journal of a shaft: nominal diameter 50mm, width of bearing shell: 20mm
[3] max. radial bearing load: 500N
[4] Drive motor: 0.37kW, max. 1500rpm
[5] Determination of friction torque with strain gauge force sensor and lever arm
[6] Electronic sensors and digital displays for: speed, oil temperature, oil pressure (supply and peak), friction torque, displacement in X- and Y-direction
[7] 230V, ~50Hz


Technical Data

Journal of a shaft

- nominal diameter d: 50mm
Bearing clearance

- 0.035; 0.055; 0.075; 0.095; 0.2mm

- 3-phase asynchronous motor with frequency


- power output: 0.37kW
- speed: 0...1500rpm
Speed measurement: optical sensor
Max. friction torque: 0...1Nm
Max. radial load: 0...500N
Oil pressure measurement range: 0...10bar
Oil supply pressure: min. 3bar
Oil temperature measurement with RTD (PT100)


Dimensions and Weight
l x w x h : 1000 x 750 x 1580 mm
Weight : approx. 200 kg
Required for Operation
230V, ~50Hz, other voltage on request
Scope of Delivery

1 apparatus completely mounted with 5 different

   journals of a shaft

1 single-head wrench SW32

1 set of angular Allan keys

5L motor oil

1 instruction manual

Order Details
040.29000  TM 290  Hydrodynamic Bearing
© 2005 G.U.N.T. Gerätebau GmbH