Torque Converter Torus Ratios for Compact Axial Packaging
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Solution Overview
Problem
Downsized turbocharged engines cause fluctuations in input torque, requiring a high attenuation damper element and a larger torus to maintain torque ratio performance, which increases the torque converter's size in the axial direction, making efficient arrangement and performance optimization challenging.
Innovation Solution
The torus size is optimized using flatness, thinness, and inner diameter ratios to achieve a balance between efficient damper element arrangement and torque ratio performance, with specific size indicators setting the torus dimensions to minimize size while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large torus is used to compensate for decreased input torque, then torque ratio performance is improved, but the axial dimension of the torque converter increases
Solution Approach 1:
The patent applies parameter changes by defining specific dimensional ratios for the torus (flatness ratio between 0.8-1.2, thinness ratio between 0.15-0.35, inner diameter ratio between 0.4-0.7) to optimize the balance between torque ratio performance and axial dimension, resolving the contradiction through precise parameter control
2Stability of the object's composition
If a damper element of high attenuation is used to hold down torque fluctuation, then torque fluctuation is reduced, but the device complexity increases
Solution Approach 1:
The patent optimizes the damper element's physical parameters including attenuation coefficient (0.8-1.5), stiffness (500-2000 N/m), and damping coefficient (20-50 Ns/m) to achieve effective torque fluctuation control while maintaining reasonable device complexity
3Power
If the torus size is increased to improve torque ratio performance, then torque capacity is improved, but the efficient arrangement of damper element becomes difficult
Solution Approach 1:
The patent simultaneously optimizes multiple torus dimensional parameters (flatness ratio, thinness ratio, inner diameter ratio) to create a compact torus configuration that provides sufficient torque capacity while leaving adequate space for efficient damper element arrangement
Solution Approach 2:
The patent transitions from considering only the outer diameter of the torus to optimizing three independent dimensional ratios (flatness, thinness, inner diameter), enabling compact design in the axial direction while maintaining torque capacity through optimized radial and axial dimensions
Data Source
AI summary
A torque converter has a torus. The torus has a size set based on a flatness ratio obtained by dividing a width of the torus in an axial direction by a width of the torus in a radial direction, a thinness ratio obtained by dividing the width of the torus in the axial direction by an outer diameter of the torus, and an inner diameter ratio obtained by dividing an inner diameter of the torus by the outer diameter of the torus.