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TM 282 Friction in journal bearings



  • Fundamentals of hydrodynamic lubrication1
  • Friction states for different operating states1
  • Electronic speed control and digital display of speed and lubricant temperature


Technical Description

There a many factors of influence concerning the friction states in a hydrodynamic journal bearing. Speed, load, and viscosity are focused in particular. TM 282 enables to study various factors of influence on friction.

The journal bearing consists of an electrically driven journal rotating in a freely movable bearing housing. The transparent bearing housing enables the observation of the displacement of the journal depending on the speed and the direction of rotation as well as the characteristic behaviour when starting.

A load device transfers the applied load to the bearing housing. The load can be varied with the supplied weights. The determination of the friction moment is realised by a sliding weight balancing the moment on a balance beam. The shaft is driven by an electric motor. The speed is variably adjustable by a frequency converter. A temperature sensor ins the bearing bush records the temperature and therefore the viscosity of the lubricant. The temperature is indicated at the display and control unit. Lubricant is supplied by a drip-feed lubricator that feeds oil to the bearing bush via two lubrication channels. A drip tray collects the oil that leaks out.

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments. 

  Learning Objectives / Experiments

- developing technological correlations involved in hydrodynamic lubrication by experimentation
- moment of friction in a journal bearing dependent on 
  * speed
  * bearing load
  * lubricant and lubricant temperature


[1] investigation and visualisation of a hydrodynamic bearing 
[2] radial journal bearing with stainless steel shaft journal and freely movable bronze bearing shells 
[3] drip-feed lubrication for continuous lubricant supply (drip-feed lubricator) 
[4] load applied to journal bearing using a mechanical lever
[5] variable speed via frequency converter
[6] measurement of friction moment using a lever with sliding weight
[7] inductive speed measurement
[8] thermocouple at the bearing housing for oil temperature measurement
[9] display and control unit with digital displays for oil temperature and speed

Technical Data

Journal bearing
- bearing journal diameter: D=30mm
- bearing width: 45mm
- friction pairing: steel / bronze
Motor: 0,37kW

Oil viscosity class: ISO VG 32
Set of weights 
- 1x 50N, 1x 20N, 2x 10N, 2x 5N; 
- lever transmission ratio: 5:1

Measuring ranges

- temperature: -50...200°C
- speed: 0...3.000min-1
- bearing load: max. 525N
- friction moment: max. 295Nmm

Dimensions and Weight
LxWxH: 600x440x360mm (experimental unit)
LxWxH: 360x310x160mm (display and control unit)
Weight: approx. 40kg
Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz, 1 phase

Scope of Delivery
1 experimental unit
1 display and control unit
1 set of weights 
0,5L oil
1 set of instructional material

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