Slanted Traction Planetary Drive for Turbo Shaft Thrust Absorption
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Solution Overview
Problem
Existing super-turbochargers require thrust bearings to prevent axial movement of the turbo shaft, which adds complexity and potential failure points, whereas the proposed solution eliminates the need for such bearings by using slanted traction surfaces and roller planets to counteract thrust forces.
Innovation Solution
A planetary traction drive system for super-turbochargers featuring slanted traction surfaces on the turbo shaft and roller planets with matching slanted outer traction surfaces, creating axial forces that counteract thrust forces, thereby securing the turbo shaft without the need for thrust bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If thrust bearings are used to prevent axial movement of the turbo shaft, then axial stability is improved, but device complexity increases
Solution Approach 1:
The invention extracts and eliminates the thrust bearing component from the system by using the slanted traction surfaces on the roller planets to directly counteract axial thrust forces on the turbo shaft, thereby reducing device complexity while maintaining axial stability
Solution Approach 2:
The roller planets are given a dual function: they not only transmit torque through the traction drive mechanism but also simultaneously counteract axial thrust forces on the turbo shaft through their slanted outer traction surfaces, eliminating the need for separate thrust bearings
2Stability of the object's composition
If thrust bearings are used to prevent axial movement of the turbo shaft, then axial stability is improved, but reliability decreases
Solution Approach 1:
By removing the thrust bearing component entirely and replacing it with the slanted traction surface mechanism, the invention eliminates potential failure points associated with thrust bearings while maintaining axial stability through the distributed force counteraction
3Device complexity
If slanted traction surfaces and roller planets are used to counteract thrust forces, then device complexity is reduced, but axial stability must be maintained
Solution Approach 1:
The roller planets perform multiple functions simultaneously: torque transmission through the traction drive and axial thrust counteraction through their slanted outer surfaces, thereby reducing device complexity while maintaining axial stability
Solution Approach 2:
The slanted outer traction surfaces of the roller planets generate counteracting axial forces that balance and neutralize the thrust forces acting on the turbo shaft, maintaining axial stability without requiring separate thrust bearing 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
This design effectively prevents axial movement of the turbo shaft, simplifies the system by eliminating thrust bearings, and enhances reliability by distributing forces through slanted traction interfaces, allowing for efficient torque transfer and reduced risk of mechanical failure.
Implementation Method 1
a first roller outer traction surface that engages the first slanted traction surface of the turbo shaft to form a first roller-shaft traction interface, the second roller having a second roller outer traction surface that engages the second slanted traction surface of the turbo shaft to form a second roller-shaft traction interface
Data Source
AI summary
Disclosed are embodiments of thrust absorbing planetary traction drives that utilize roller-shaft traction interfaces that are slanted to absorb thrust created on a turbo shaft by a turbine or compressor. Slanted traction surfaces on the sun portion of the turbo shaft are slanted inwardly so that the turbo shaft remains centered in the planetary traction drive. Either double roller planets or single roller planets can be used to absorb thrust in the axial direction of the turbo shaft. Various curved and slanted surfaces can be utilized to create traction interfaces that hold and stabilize the turbo shaft both axially and radially.