Multi-Row Ball Thrust Bearing for Low-Friction High-Speed Loads
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Solution Overview
Problem
Roller bearings in transmissions experience high frictional losses and contact issues due to the inability to maintain a rolling condition along their length, leading to sliding and increased heat generation, especially at high rotational speeds.
Innovation Solution
A thrust bearing design featuring a cage with multiple rows of spherical balls positioned between two races, allowing relative rotation and distributing load forces effectively, reducing friction and heat generation by minimizing contact area and sliding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If cylindrical roller bearings are used to increase load capacity, then load capacity is improved, but frictional losses increase due to inability to maintain rolling condition along roller length
Solution Approach 1:
The patent divides the rolling element from a single long cylindrical roller into multiple shorter cylindrical rollers arranged in series. This segmentation allows each individual roller to better maintain rolling condition along its length, reducing sliding friction. The multiple rollers collectively support the same load while each experiences improved rolling kinematics, thus resolving the contradiction between load capacity and frictional losses.
2Force
If longer cylindrical rollers are used to increase load capacity, then load capacity is improved, but sliding increases at points away from the single rolling contact point
Solution Approach 1:
The patent segments the long roller into multiple shorter rollers. Each shorter roller can maintain proper rolling contact over a greater portion of its length relative to its total length, reducing the sliding that occurs at the ends of long rollers. This segmentation eliminates the harmful sliding effect while maintaining the load capacity through the combined effect of multiple rollers.
Solution Approach 2:
The patent arranges multiple rollers in a series arrangement along the load path, effectively adding a dimensional aspect to the load distribution. Instead of relying on a single long roller, the load is distributed across multiple rollers positioned in sequence, which changes the kinematic relationships and reduces sliding at contact points.
3Speed
If cylindrical roller bearings are used at high rotational speeds, then speed capability is improved, but heat generation increases due to frictional losses and roller tipping motion
Solution Approach 1:
The patent segments the roller system into multiple shorter rollers, which reduces the tipping motion and associated frictional losses that occur in long rollers at high speeds. Each shorter roller experiences less moment arm effect and reduced tendency to tip forward or backward during rotation, thereby generating less heat while maintaining high-speed capability.
4Force
If roller bearings are used to support thrust loads, then load capacity is improved, but frictional losses increase due to lack of rolling condition
Solution Approach 1:
The patent applies segmentation by using multiple shorter cylindrical rollers instead of a single long roller for thrust bearing applications. This segmentation allows each roller to better maintain rolling condition along its length, reducing sliding friction while collectively supporting the thrust load, thus resolving the contradiction between thrust load capacity and frictional losses.
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 thrust bearing design enhances efficiency and durability by distributing load forces among multiple balls, reducing frictional losses and heat generation, and minimizing sensitivity to system misalignment, while maintaining efficient operation at high speeds.
Implementation Method 1
a plurality of rolling elements positioned between the first race and the second race
Data Source
AI summary
A thrust bearing has an outer race and an inner race arranged for rotation relative to the outer race about an axis of rotation. Multiple rolling elements are positioned between the inner and outer races. A cage is positioned between the inner and outer races and configured to engage with the rolling elements to align the rolling elements into multiple rows, with the rows circumferentially spaced apart from one another.