Key Technical Difficulties And Solutions for Radial Tilting Pad

White metal radial tilting pad bearings play a critical role in advanced rotating machinery, where they support high-speed rotor operation. In this article, we examine the core technical challenges and present practical solutions.

Core Challenges and Solutions for Radial White Metal Tilting Pad Bearings

The radial white metal tilting pad supports high-speed rotation of the rotor. The rotating speed usually reaches 6000–15000 rpm. The challenges focus on high-speed stability, precision, and temperature rise control. The specific solutions are as follows:

1. High-speed Stability——Solving Oil Whip

Under 6000–15000 rpm high-speed operating conditions, the main risks are oil whip and half-speed whirl. Improper design of pad quantity, angle, preload, and stiffness may lead to severe vibration.

Solution: A hydrodynamic lubrication simulation model is established. The number, angle, and preload of pads are optimized based on data correction from the test bench to mitigate pad flutter caused by preload. We also refer to databases from leading international manufacturers and progressively build an independent reliability data framework.

2. Coaxiality and Roundness Control——Excessive Local Load

Tilting pad bearings consist of multiple tilt pads. The roundness must be ≤0.005mm and wall thickness variation ≤0.01 mm. If the precision is insufficient and the local load becomes excessively high, the pads may cause overheating and excessive vibration.

Solution: We use integrated CNC boring and grinding, supported by CMM and ultrasonic testing, to ensure assembly roundness within 0.005 mm and wall thickness variation within 0.01 mm after multi-pad assembly. Through thickness grouping and matching, we prevent localized overload that can lead to excessive heating and vibration.

3. Temperature Rise Control Under High-Speed Rotation – Preventing Alloy Softening

The higher the speed, the more heat generated from friction. Without proper oil groove design, inlet positioning, and cooling structure, oil temperature can exceed 110°C—resulting in alloy softening or bearing seizure.

Solution: Oil groove design and inlet positioning are optimized first. With high-efficiency cooling and temperature monitoring, oil temperature stays below 110°C—preventing Babbitt softening and bearing seizure.

Tilting Pad Bearing

Radial Tilting Pad

Radial Tilting Pad

Summary

The core challenges of radial tilting pad bearings lie in high-speed stability, precision control, and temperature rise management. Only by optimizing the simulation model, improving machining precision, and enhancing heat dissipation design can we address issues such as vibration and temperature rise under high-speed operating conditions—ensuring stable rotor operation and providing reliable support for high-end equipment.