11. Influence of pinion shaft bearing endplay (axial clearance) on its seizure initiation
In order to prevent pinion bearing seizure and increase the reliability of gear units, it is important to ensure that sufficient endplay is maintained with the pinion bearings during rotation (Fig. 1). Bench rotation tests were conducted to measure changes in endplay, variations in endplay caused by changes in temperature of the pinion bearings and the peripheral parts were estimated through calculation.
Results showed that the lower the temperature of the gear oil, the greater the reduction in endplay immediately after the rotation start of the shaft. In addition, the difference between measured and calculated endplay was 0.02 mm at most, confirming that the tendency of their variations were almost the same (Fig. 2).
The rotational torque of the pinion bearings and the temperature of each component were also measured. It was revealed that, when the (calculated) endplay reduced to near 0mm due to changes in temperature of the pinion bearings and its peripheral parts during rotation, seizure occurred, and the bearing shaft torque and temperature suddenly rose (Fig. 3).
From these results, it can be concluded that assembly methods capable of not reducing the endplay to near 0 mm during the shaft rotation, and structures capable of eliminating the adjustment of the endplay, were found to be effective in preventing pinion bearing seizure.
Other Contents
- 1. Earthquake damage simulator for railways with self-correcting function
- 2. Practical application of early earthquake warning method using ocean bottom seismometer data
- 3. Countermeasures to prevent subsidence of abutment backfill and track buckling during earthquakes
- 4. Ground surface layer response evaluation method for very large earthquakes
- 5. Anti-seismic reinforcement method for suspended-ceilings with small cavities at stations
- 6. Algorithm to estimate strong wind locations due to such as gusts.
- 7. Flowchart to determine possibility of reusing bridge following scouring damage
- 8. Increase in accuracy of bogie hunting stability evaluation
- 9. Driver visual recognition support method using image processing
- 10. Health monitoring of very large structures using long-range U-Doppler
- 11. Influence of pinion shaft bearing endplay (axial clearance) on its seizure initiation
- 1. Earthquake damage simulator for railways with self-correcting function
- 2. Practical application of early earthquake warning method using ocean bottom seismometer data
- 3. Countermeasures to prevent subsidence of abutment backfill and track buckling during earthquakes
- 4. Ground surface layer response evaluation method for very large earthquakes
- 5. Anti-seismic reinforcement method for suspended-ceilings with small cavities at stations
- 6. Algorithm to estimate strong wind locations due to such as gusts.
- 7. Flowchart to determine possibility of reusing bridge following scouring damage
- 8. Increase in accuracy of bogie hunting stability evaluation
- 9. Driver visual recognition support method using image processing
- 10. Health monitoring of very large structures using long-range U-Doppler
- 11. Influence of pinion shaft bearing endplay (axial clearance) on its seizure initiation