Journal Friction Apparatus .
Description of Journal Friction Apparatus:
Journal Friction Apparatus is the basic item in the Hydrodynamic
Lubrication Unit which enables the friction in a journal bearing to be
measured under various conditions of load and speed, including boundary
lubrication conditions, and the comparison of the results with the
friction torque predicted by the Petroff equation. The apparatus
consists of a sturdy tubular steel frame on which is carried a counter
shaft mounted in ball bearings having an overhung mandrel at the front.
The shaft is driven by a variable speed DC motor via a toothed belt and
pulleys. The bearing system, which is to be the subject of the
investigation, is assembled around the mandrel.
Experimental Capability of Journal Friction Apparatus:
1. Friction Torque in a Journal Bearing assembled with any combination of 3 shaft sleeves and any 3 bearing shell widths:
- During running-in of the bearing shells.
of torque-load parameter curves under different conditions of journal
speed, load and including boundary lubrication conditions.
- Comparison of friction torque with that predicted by the Petroff equation.
2. Pressure Distribution in a Journal Bearing.
of summated pressures with applied load under different conditions
including conditions of limited boundary lubrication.
3. Bearing Attitude.
- Measurement of approximate running-in wear.
- Measurement of bearing attitude for different conditions of load and speed.
Features of Journal Friction Apparatus:
- Horizontal 50 mm shaft and journal bearing;.
- Three alternative shaft sleeves provide variable bearing clearance.
- Uses automotive thin wall main bearing shells of various widths.
- Variable speeds up to 1000 rev/min.
- Radial loading of the bearing of up to 500N is applied vertically by weights via an hydrostatic pad.
- Air cylinder driven reciprocating oil pump and accumulator.
- High quality oil filtration and pressure regulation.
- Direct measurement of bearing friction torque.
of oil film thickness and detection of metal to metal contact based on
electrical resistance between journal and housing.
- Instrumented for oil pressure and temperature, and drive motor current