Bearing Assembly Pressure Equalization Valve
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Solution Overview
Problem
Large bearings experience pressure differences due to thermal expansions, leading to seal wear, increased friction, and contamination, as existing pressure equalization methods are inadequate, especially in sealed large bearings.
Innovation Solution
Incorporating a pressure equalization line with a mechanically, hydraulically, pneumatically, or electrically actuable valve to control pressure equalization between the bearing interior and environment, ensuring consistent internal pressure with the ambient pressure, and preventing clogging of lubricant outlet systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If outlet bores are provided for excess lubricating grease, then lubricant can be discharged from the bearing, but the outlet bore can be clogged by excess lubricating grease such that pressure influence is not possible
Solution Approach 1:
A valve is introduced as an intermediary component in the pressure equalization line to control the flow of lubricant. The valve mediates between the bearing interior and the collecting container, allowing pressure control while preventing clogging issues that would affect direct outlet bores.
Solution Approach 2:
The pressure equalization function is extracted from the lubricant outlet system. Instead of relying on the outlet bore for both lubricant discharge and pressure control, the pressure equalization is achieved through a separate line with a valve, separating these two functions to avoid interference.
2Reliability
If seals are provided in the bearing, then the bearing is sealed against the environment, but pressure differences due to thermal expansions negatively affect seal function causing greater wear and higher friction
Solution Approach 1:
The pressure parameter inside the bearing is actively changed and controlled through the pressure equalization line. By adjusting the valve position, the internal pressure can be equalized with external pressure, eliminating the harmful pressure differences that cause seal wear and friction.
Solution Approach 2:
The pressure equalization system provides preliminary anti-action against the harmful effects of pressure differences. By preemptively equalizing pressure before severe wear occurs, the system prevents the negative effects on seal function rather than merely reacting to them.
3Reliability
If pressure equalization line is provided to the environment, then pressure differences can be compensated, but the pressure equalization line needs to be opened and closed controllably
Solution Approach 1:
The valve serves multiple functions: it controls pressure equalization, prevents contamination ingress, and manages lubricant flow. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving reliable pressure control.
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 improves seal function by maintaining consistent internal pressure, reducing wear and friction, and preventing contamination by actively managing pressure equalization, especially in large bearings with slow rotational speeds.
Implementation Method 1
changes in the pressure in the interior of the bearing assembly relative to the ambient pressure arise due to temperature changes even more than in normal-sized bearings. This is caused by, among other things, different thermal expansions of air and lubricant and of the steel rings of the bearing.
Data Source
AI summary
A bearing assembly includes a bearing for supporting a first machine part relative to a second machine part, a seal assembly configured to seal a first space in a region of the bearing relative to a second space, a pressure equalization passage fluidically connecting the first space and the second space, a valve configured to open and close the pressure equalization passage, and a controller configured to control the valve.