Turbine Shell Integrated Stiffening Elements Torque Converter
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Solution Overview
Problem
Turbine shells in torque converters deflect due to fluid forces, potentially leading to catastrophic failure from differing rotational speeds, and existing stiffening methods like brazing increase cost and weight, or fail to integrate stiffening elements into curved surfaces.
Innovation Solution
Integration of stiffening elements within the turbine shell's inner profile, formed through a stamping process, providing radial and axial support without the need for brazing, or in combination with brazing to reduce weight and rotational inertia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If brazing process is used to stiffen the turbine shell, then the structural strength is improved, but the production cost and weight increase
Solution Approach 1:
The patent applies local quality by integrating stiffening elements only in specific regions of the turbine shell where structural support is most needed. The stiffening elements are positioned to provide localized reinforcement against fluid forces and rotational stresses, rather than uniformly strengthening the entire shell. This targeted approach improves structural strength where required while minimizing additional weight compared to comprehensive brazing.
Solution Approach 2:
The patent merges the stiffening function directly into the turbine shell structure by integrating stiffening elements during the stamping process. This combination eliminates the need for separate brazing operations and additional weight from brazing materials. The stiffening elements become an inherent part of the shell structure, providing strength without the penalties of additive manufacturing or thermal joining processes.
2Strength
If brazing process is used to stiffen the turbine shell, then the structural strength is improved, but the production cost increases
Solution Approach 1:
The patent applies preliminary action by incorporating stiffening elements into the turbine shell during the initial stamping process. The stiffening features are formed as integral parts of the shell structure before any assembly or joining operations. This upfront integration eliminates subsequent brazing steps, reducing production complexity and cost while ensuring the structural strength is built-in from the start rather than added later through expensive thermal processes.
Solution Approach 2:
The patent extracts the brazing process from the manufacturing sequence entirely by using stamping-formed stiffening elements. By removing the brazing operation, the patent eliminates associated costs including specialized equipment, skilled labor, quality control procedures, and potential rework. The stiffening function is achieved through a simpler, more cost-effective stamping process that integrates structural reinforcement without requiring thermal joining.
3Strength
If traditional stiffening methods are used, then the structural support is improved, but the integration into curved shell surface is difficult
Solution Approach 1:
The patent applies spheroidality by designing stiffening elements with curved surfaces that match the geometry of the turbine shell. The stamping process forms stiffening features that follow the contours of the curved shell, allowing seamless integration without flat panels or angular components. This curvature matching enables the stiffening elements to conform to the shell's geometry, providing structural support while maintaining the aerodynamic and structural integrity of the curved surface.
Solution Approach 2:
The patent merges the stiffening function directly into the turbine shell structure by integrating stiffening elements during the stamping process. This combination eliminates the need for separate brazing operations and additional weight from brazing materials. The stiffening elements become an inherent part of the shell structure, providing strength without the penalties of additive manufacturing or thermal joining processes.
Data Source
AI summary
A torque converter having an input means and an output means, comprising a cover non-rotatably connected to the input means, an impeller having an impeller shell non-rotatably connected to the cover, the impeller also having at least one blade fixedly secured to the impeller shell, a stator having at least one blade fixedly secured thereto, and, a turbine having a turbine shell non-rotatably connected to the output means, the turbine shell comprising a first profile having at least one blade fixedly secured thereto, and a second profile arranged concentrically within the first profile, the second profile comprising at least one integrated stiffening element.


