Thrust Washer Lubricant Pocket Geometry for High-Speed Separation
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Solution Overview
Problem
Thrust washers in modern drives, such as electric motors, face challenges with lubricant distribution due to increased centrifugal forces and lower viscosity lubricants, leading to suboptimal separation of friction partners and accelerated wear in limited installation spaces.
Innovation Solution
A thrust washer design featuring a central bore parallel to its rotational axis, with tapering lubricant pockets that increase pressure through centrifugal force, counteracting negative pressure and enhancing lubricant distribution between components, allowing for more efficient lubrication and reduced wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the thrust washer rotates at high speed with conventional triangular lubricant pockets, then centrifugal force increases and lubricant is conveyed outward more rapidly, but the achieved lifting effect deteriorates and negative pressure pulls the thrust washer toward the lubricated component
Solution Approach 1:
The patent changes the geometric parameters of the lubricant pockets from conventional triangular shapes to annular or sector-shaped pockets with specific radial and circumferential dimensions. This parameter change allows the pockets to maintain optimal lubricant retention and pressure distribution at high rotational speeds, preventing the thrust washer from being pulled toward the lubricated component while still benefiting from centrifugal force for lubricant distribution.
2Quantity of substance
If the lubricant viscosity is reduced in novel drives, then fluid flow improves, but the lifting effect and separation capability deteriorate
Solution Approach 1:
The patent modifies the geometric parameters of the lubricant pockets, particularly increasing their circumferential extent and optimizing their radial depth, to compensate for reduced lubricant viscosity. These parameter changes create larger pocket volumes and optimized flow paths that maintain adequate lubricant film thickness and pressure buildup even with lower viscosity lubricants, ensuring reliable separation effect.
3Volume of moving object
If the thrust washer is made flatter and more compact to reduce installation space, then installation space requirement decreases, but lubricant distribution and pressure generation capability are limited
Solution Approach 1:
The patent implements local quality by creating annular or sector-shaped lubricant pockets with varying depths and cross-sectional areas at different radial and circumferential positions. This local variation in pocket geometry optimizes lubricant distribution and pressure generation in specific high-stress regions while maintaining an overall compact thrust washer design with minimal axial height, thus resolving the contradiction between compactness and pressure capability.
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 design achieves improved lubrication pressure and equilibrium of forces, reducing wear and extending the service life of mechanical components in constrained spaces by optimizing lubricant distribution and film formation.
Implementation Method 1
the first and/or the second lubricant pocket in each case tapering outward in the radial direction in relation to the rotational axis... the lubricant is pressed into the lubricant pockets by the centrifugal force
Data Source
AI summary
A thrust washer having a central bore extending parallel to a rotational axis of the thrust washer for pushing the thrust washer onto a journal or a shaft; a first thrust surface and a second thrust surface that are arranged substantially parallel to one another, the first thrust surface having a first lubricant pocket in the form of a depression in the first thrust surface, and/or the second thrust surface having a second lubricant pocket in the form of a depression in the second thrust surface, the first lubricant pocket or the second lubricant pocket being connected fluidically to the respective other thrust surface or to a respective corresponding first or second lubricant pocket by a channel which runs substantially parallel to the rotational axis axially through the thrust washer, the first and/or the second lubricant pocket taper outward in the radial direction relative to the rotational axis.