Drain Plug Fluid Flow Restriction for Carrier Assembly Lubrication
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Solution Overview
Problem
Current drain plug configurations in carrier assemblies lead to efficiency losses and inadequate lubrication due to fluid churning, especially in narrow package configurations, resulting in premature wear of gear components.
Innovation Solution
A drain plug system that controls fluid flow by varying the diameter to adjust the flow rate between a reservoir and a sump, reducing churning losses and ensuring sufficient lubrication by separating the sump and reservoir with a channel and using a drain plug that extends across this channel to provide a fluid flow restriction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the internal cavity is filled with lubricating fluid to lubricate the gear assembly, then adequate lubrication is provided, but churning losses increase and efficiency decreases
Solution Approach 1:
The internal cavity is segmented into two distinct regions: a reservoir region for storing lubricating fluid and a sump region for gear assembly lubrication. This segmentation allows the fluid to be separated into functional zones, reducing churning while maintaining lubrication supply through controlled flow paths.
Solution Approach 2:
A drain plug acts as an intermediary component between the reservoir and sump regions. It controls the fluid flow rate from the reservoir to the sump, enabling regulated lubrication supply while minimizing excessive fluid movement that causes churning losses.
2Volume of moving object
If a narrow package carrier configuration is used, then space efficiency is improved, but churning losses increase due to fluid dynamics in confined spaces
Solution Approach 1:
The narrow carrier assembly is segmented with a reservoir region and sump region separated by a partition. This segmentation allows efficient use of limited space while preventing excessive fluid churning in the confined geometry by restricting fluid flow through the drain plug.
3Reliability
If excessive lubricating fluid is present in the sump, then lubrication coverage is improved, but foaming occurs and lubrication effectiveness decreases
Solution Approach 1:
The drain plug serves as a flow-regulating intermediary that controls the rate at which lubricating fluid moves from the reservoir to the sump. This regulation prevents excessive fluid accumulation that causes foaming while ensuring sufficient lubrication coverage.
Solution Approach 2:
The drain plug diameter is adjusted to change the flow rate parameter, optimizing the balance between providing adequate lubrication coverage and preventing foaming conditions in the sump region.
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 system effectively reduces churning losses and maintains adequate lubrication coverage for gear components, even in narrow package configurations, by allowing controlled fluid flow and ensuring sufficient lubrication levels that can feed other passages, such as bearing passages.
Implementation Method 1
The drain plug extends into the channel to provide a fluid flow restriction between the reservoir and the sump
Implementation Method 2
One problem with current configurations is efficiency losses at the gear assembly that result from churning of the lubricating fluid
Implementation Method 3
a controlled drain back to a main cavity via the drain plug allows a high running level to feed other lubricating passages
Data Source
AI summary
A drain plug for a carrier assembly is used to control fluid flow from a reservoir to a sump. The carrier assembly includes a carrier housing with an internal cavity that houses a gear assembly. The sump is located within the internal cavity to lubricate the gear assembly. The reservoir is separated from the sump by a channel. The drain plug is attached to the carrier housing, and extends into the channel, to provide a fluid flow restriction between the reservoir and the sump.