The aim of the experiment was to determine porosity of the sleeve of a self-lubricating bearing, saturate the sleeve with oil. Beside this we checked the way of mounting the sliding bearing and calculated the change of torque in the first ten minutes of operation of such a bearing.
The measurements of dimensions of sleeves were done carefully, with use of laboratory, analytical balance, calibrating mandrel, inner and outer diameter gauges etc. Following the instruction, we put the dry, new sleeve inside the vacuum dryer. Simultaneously the other members of group remounted old sleeve and assembled new one, saturated with oil. Then the engine of wearing-in stand was switched on and the measurements were taken.
TABLE 7.1
Measured quantities
[kg]
Calculated quantities
Errors
Q1
0,06452
ρv
5246,855
[kg/m3]
Δρv
2,77E-7
Q2
0,0632
Qol
-0,00132
ΔQol
0,014142136
Q3
0,05305
Po
-0,12198
ΔPo
0,0000551
Q4
0,00211
Pc
0,331611
ΔPc
0,000359
mass of dry sleeve (before saturating it with oil)
mass of sleeve after saturating with oil
mass of sleeve saturated with oil, along with the wire, submerged in water
mass of wire whose one end (shaped as loop) is immersed in water
- mass density of sintered material
- oil penetrated into it’s pores
- active porosity
- total porosity
V – sleeve volume
volume of open pores
total volume of pores
mass density of the water (takes)
mass density of oil used to saturate sleeve
- oil density as a function of temperature
mass density of iron (takes )
TABLE 7.2 (if not marked different, all units in mm)
The orientation of the measuring device
Average value
RMS Error
0o
45o
90o
135o
Do
35,99
35,988
35,9135
0,001446
35,987
35,986
Dp
36,06
36,054
36,057
0,0004226
Negative allowance
Dp-Do=
0,1435
dp
25
0
dc
24,8
24,85
24,9
24,79583
0,062006
24,75
24,7
Clearance
dp-dc=
0,20417
diameter of the holder’s seating hole
outer diameter of the sleeve
diameter of sleeve’s hole after calibration
diameter of the journal
- root mean square
...
MEiL