Tilting Pad Journal Bearing Oil Feed Layout for Pad Temperature Control
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Solution Overview
Problem
In tilting pad journal bearings, the existing method of adjusting oil feed quantity by varying oil feeding hole diameters fails to adapt to changing operating conditions, leading to increased pad temperatures on the load-applied side during high peripheral speeds, potentially causing damage.
Innovation Solution
The circumferential position of the oil feeding hole openings is adjusted relative to the bearing pads, with upstream positioning for load-applied pads and downstream positioning for load-free pads, allowing for dynamic adjustment of oil flow based on rotating speed, ensuring a larger oil quantity is fed to the load-applied side during high peripheral speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cross-sectional area of oil feeding holes is reduced to decrease overall oil feed amount, then oil feed amount is reduced, but the ability to suppress pad temperature rise under high peripheral speed conditions deteriorates
Solution Approach 1:
The patent applies local quality by positioning oil feeding holes at different circumferential locations for different bearing pads. Pads on the load-applied side have oil feeding holes positioned to receive greater oil flow, while pads on the non-load side have holes positioned to receive less oil flow. This localized differentiation allows optimal cooling where needed without unnecessarily reducing overall oil consumption.
Solution Approach 2:
The patent implements dynamics by making the oil feeding system adaptive to operating conditions. The circumferential positioning of oil feeding holes creates a dynamic oil distribution pattern that automatically adjusts oil flow to pads based on their position relative to the load zone, enabling the system to maintain effective cooling under varying peripheral speeds and load conditions.
2Device complexity
If fixed diameter oil feeding holes are used for all pads, then device complexity is reduced, but adaptability to different operating conditions deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the bearing into distinct zones based on load application. Oil feeding holes are segmented into different circumferential positions corresponding to load-applied pads and non-load pads. This segmentation allows each pad to receive appropriate oil flow based on its operational requirements without complicating the overall feeding structure.
Solution Approach 2:
The patent introduces a new dimension for oil feed control by varying the circumferential position of oil feeding holes rather than changing hole diameters. This positional dimension provides adaptability to different operating conditions while maintaining structural simplicity, as the positioning geometry can be established during bearing manufacturing without requiring complex adjustable mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively suppresses the rise in bearing pad temperatures on the load-applied side at high peripheral speeds, enhancing the reliability and performance of the tilting pad journal bearing by allowing for adaptive oil distribution based on operating conditions.
Implementation Method 1
an oil feeding hole to supply lubricant oil to a sliding portion of a bearing pad
Implementation Method 2
heat generated by shear in an oil film causes the oil film temperature to rise
Implementation Method 3
heat generated by shear in an oil film causes the oil film temperature to rise
Data Source
AI summary
A tilting pad journal bearing is arranged such that a circumferential relative position of an opening portion of an oil feeding hole to supply lubricant oil to a sliding portion of a bearing pad with respect to the bearing pad differs depending on the position of each bearing pad. For a bearing pad under a rotary shaft which supports the load of the rotary shaft, the circumferential position of an opening portion of an oil feeding hole with respect to the bearing pad is set toward an upstream side of a space between pads in a rotating direction of the rotary shaft. For a bearing pad above the rotary shaft, the circumferential position of an opening portion of an oil feeding hole with respect to the bearing pad is set toward a downstream side of a space between pads in the rotating direction of the rotary shaft.