Direct Drum Bushing Lubrication Channels
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Solution Overview
Problem
The existing bushings in automotive transmissions, particularly in the Ford 5R110W automatic transmission, suffer from inadequate lubrication, leading to excessive friction and shortened lifespan due to insufficient lubricant distribution across the bearing surfaces.
Innovation Solution
An improved cylindrical bushing design featuring multiple channels, including a central circumferential channel and perpendicular channels along the height, with strategically positioned openings to enhance lubrication pressure and distribution, is introduced. This design includes a cylindrical sleeve with an outer surface that secures to the direct clutch drum, a central channel for lubricant transfer, and four vertical channels that intersect perpendicularly, ensuring even lubricant distribution and increased pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If narrow cylindrical bushings are used in the direct clutch drum, then the bushing fits within the center cylindrical opening, but inadequate lubrication occurs leading to excessive friction and shortened lifespan
Solution Approach 1:
The bushing is segmented into multiple functional zones with different channel configurations. The central circumferential channel is segmented into multiple sections, and vertical channels are distributed at different heights, creating a segmented lubrication system that delivers lubricant to multiple bearing surfaces simultaneously, reducing friction and improving reliability
Solution Approach 2:
Different regions of the bushing are given different lubrication characteristics through the channel design. The central circumferential channel provides continuous lubrication along the drum's rotation path, while vertical channels provide localized lubrication at specific heights, ensuring each bearing surface receives appropriate lubrication quality for its specific operational requirements
2Reliability
If multiple channels with openings are added to the bushing, then lubrication pressure and distribution improve, but device complexity increases
Solution Approach 1:
Multiple lubrication functions are merged into a single integrated bushing component. The central circumferential channel and vertical channels are combined in one piece, eliminating the need for separate lubrication systems or multiple bushing components, thereby improving lubrication adequacy without proportionally increasing complexity
Solution Approach 2:
The bushing is designed with multi-functionality, serving both as a structural support element and as an active lubrication distribution system. The channel network performs multiple lubrication tasks simultaneously - delivering lubricant radially, axially, and circumferentially - reducing the need for additional dedicated lubrication components
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 improved bushing design effectively increases lubricant pressure and distribution, reducing friction and extending the lifespan of the bushing by ensuring adequate lubrication across the bearing surfaces, similar to the hydroplaning effect, thereby enhancing the overall performance and longevity of the transmission components.
Implementation Method 1
The present invention seeks to induce an effect similar to hydroplaning between an improved bushing and supporting surface
Implementation Method 2
inadequate lube applied to the bearing surface... when a bushing surface is adequately lube it will effectively hydroplane across the supporting surface
Data Source
AI summary
An improved bushing restricts exhaust at a lube transfer port and exhaust ports equalizing bushing lube PSI with lube supply PSI. A hole or pair of holes in the bushing with an area equal to that of the lube supply holes in a center support regulates an intermediate pressure to the bushings of 50% of the supply pressure on its own, regardless of the balance piston. When the balance piston is filled, the added resistance at the transfer orifices will begin to equalize bushing lube PSI with lube supply PSI. When the balance piston exhaust ports are also restricted, as with an increased height of the bushing and installation site, equalization is insured and bushing lube PSI becomes that of the supply PSI.