Adjustable Ring Shim for Traction Drive Preload Setting
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Solution Overview
Problem
Driven turbochargers with planetary traction drives face challenges in setting a consistent preload force during assembly due to manufacturing variations, which can lead to inefficient torque transfer and excessive slipping between components.
Innovation Solution
An adjustable ring shim with a ramp feature is used between the ring gear and the first traction ring to set the width of the ring roller assembly, providing a preload force on the planet rollers by sliding axially during assembly, allowing for customizable preload force adjustment to compensate for manufacturing variations and prevent excessive slipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed-width ring roller assembly is used, then assembly is simple, but manufacturing variations cause inconsistent preload force
Solution Approach 1:
The ring roller assembly width is made adjustable through a variable width mechanism comprising adjustable shims positioned between the ring gear and first traction ring. This allows the width to be dynamically changed during assembly to compensate for manufacturing variations, ensuring consistent preload force while maintaining relatively simple assembly procedures.
2Manufacturing precision
If adjustable shims are added to ring roller assembly, then preload force consistency is improved, but device complexity increases
Solution Approach 1:
The adjustment mechanism is segmented into multiple discrete adjustable shims positioned at different locations within the ring roller assembly. Each shim can be independently adjusted to achieve the desired width, distributing the complexity across multiple simple components rather than requiring a single complex adjustment mechanism.
3Adaptability or versatility
If variable width mechanism is implemented, then adaptability to manufacturing variations is improved, but assembly complexity increases
Solution Approach 1:
The variable width mechanism is designed to be self-adjusting during assembly. The adjustable shims are positioned and secured in a straightforward manner that allows assembly personnel to easily achieve the correct width without requiring complex measurement tools or procedures, making the system adaptable while keeping assembly relatively simple.
Data Source
AI summary
Disclosed is an adjustable ring shim for a planetary traction drive designed for a driven turbocharger on an engine. The adjustable ring shim has two parts that interface through a ramp feature to provide an ability to vary the overall width of the ring roller assembly of the planetary traction drive. This adjustability in the width of the ring roller allows for setting a desired preload force on the traction surfaces of the traction drive during assembly, even with variation in manufacturing of the different parts of the traction drive.