Bi-directional Offset Pivot Thrust Bearing Design
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Solution Overview
Problem
Bi-directional tilting pad thrust bearings struggle to maintain optimized offset tilt in both forward and reverse rotational directions, leading to reduced load capacity and inefficiency, as existing designs sacrifice optimized tilt for bi-directionality.
Innovation Solution
A bi-directional rotation offset pivot thrust bearing with a carrier and thrust pads that automatically adjust their offset pivot between two positions based on rotational direction, using an array of longitudinal protrusions and a retainer to maintain an optimized bearing surface and load capacity in both directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed tilting pads with 50/50 percent tilt are used in both directions, then bi-directional rotation is supported, but load capacity is reduced compared to optimized offset tilt
Solution Approach 1:
The thrust pads are made dynamically adjustable through a mechanism that allows them to switch between two fixed tilt positions. The retainer with slots and pins enables the pads to automatically reposition themselves based on rotation direction, transforming a static 50/50 tilt configuration into a dynamic system that provides optimized offset tilt (e.g., 60/40 or 70/30 distribution) in both forward and reverse directions.
Solution Approach 2:
The invention changes the tilt parameter distribution by allowing the thrust pads to assume different angular positions. Instead of maintaining a fixed 50/50 percent tilt, the pads can be positioned at optimized offset angles (such as 60 percent on one side and 40 percent on the other) depending on the direction of rotation, thereby optimizing load capacity while maintaining bi-directional capability.
2Strength
If optimized offset tilt is used in one direction, then load capacity increases, but reverse direction rotation becomes extremely inefficient
Solution Approach 1:
The system transitions from a static tilted pad configuration to a dynamic one where the retainer and pin-slot mechanism enable the thrust pads to automatically switch between two optimized tilt positions. When rotation direction changes, the pads reposition themselves through the slot-guided movement, ensuring that optimized offset tilt is maintained in both forward and reverse directions rather than being fixed in one orientation.
Solution Approach 2:
The thrust pad assembly is designed to perform the same optimized load-bearing function in both rotation directions. By incorporating the retainer mechanism with slots that guide pin movement, the system achieves multi-functionality where the same physical components provide optimized offset tilt regardless of whether the carrier rotates forward or in reverse, eliminating the need for direction-specific configurations.
3Strength
If multiple bearings are used for different rotation directions, then optimized load capacity is maintained in each direction, but device complexity increases
Solution Approach 1:
The invention merges the functionality of multiple direction-specific bearings into a single bi-directional bearing assembly. The carrier, retainer, and thrust pads work together as an integrated system where the retainer's slot-and-pin mechanism enables a single set of thrust pads to provide optimized offset tilt in both rotation directions, eliminating the need for separate bearings for forward and reverse rotation.
Solution Approach 2:
A single bearing assembly is designed to universally handle both forward and reverse rotation with optimized load capacity. The thrust pads, through their interaction with the retainer and carrier protrusions, can automatically configure themselves for optimal performance regardless of rotation direction, making one bearing assembly replace what would traditionally require multiple direction-specific bearings.
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
The solution enables a single bearing to maintain optimal load capacity and offset pivot tilt in both forward and reverse rotations, eliminating the need for multiple bearings and improving efficiency by allowing continuous use without directional changes.
Implementation Method 1
controlled hydroplaning
Data Source
AI summary
The bi-directional rotation offset pivot thrust bearing includes a carrier and an array of longitudinal protrusions thereon that run through the center axis of the carrier. An array of pads are in slidable engagement with the longitudinal protrusions to permit the thrusts pads to move between first and second rotational positions. The thrust pads are automatically offset pivoted in a first direction when in a the first rotational position and automatically offset pivoted in a second direction when in the second rotational position. The thrust pads are offset pivoted in an approximate 60 percent to 40 percent ratio with the leading side of the thrust pad being 60 percent in both the first rotational position and the second rotational position. A retainer is also provided to maintain the thrust pads in slidable communication with the protrusions.