Heat Shield Bead Stiffening for Supercharger Vibration
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Solution Overview
Problem
Existing supercharging device heat shields are prone to vibration and deformation due to high pressures and temperatures, leading to potential damage to the heat shield and turbine components, especially when braced between a variable turbine geometry and a spring element.
Innovation Solution
A heat shield design featuring a second ring portion with bead-like structure-stiffening features that enhance stiffness and stability, including arcuate and planar forms, to maintain axial contact and prevent pressure impulses, combined with pressure equalization features like multiple openings and cutouts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat shield is arranged between the turbine and bearing housing to protect against heat transfer, then the bearing housing is protected against heat, but the heat shield is prone to vibration and deformation due to high pressure and temperature
Solution Approach 1:
The heat shield features a bead-like structure with elevated portions and axial wall portions that create local structural reinforcements. These localized structural enhancements provide additional stiffness and stability in the regions most susceptible to pressure impulses and thermal deformation, while maintaining the overall heat shield design.
Solution Approach 2:
The bead-like structure introduces a third dimension to the heat shield design by adding elevated portions that extend in the axial direction. This dimensional enhancement creates additional structural rigidity without significantly increasing the radial or circumferential dimensions, thereby improving stability against high pressure and temperature conditions.
2Strength
If the heat shield is braced between a variable turbine geometry and a spring element, then the heat shield is supported structurally, but the spring element can lose axial contact with the bearing housing due to high pressure and temperature
Solution Approach 1:
The bead-like structure with its elevated portions and axial wall portions creates localized structural features that can better accommodate and distribute pressure loads. This local structural enhancement helps maintain stable axial contact between the spring element and bearing housing by providing additional support points and distributing the pressure impulse more evenly.
3Area of stationary object
If the second ring portion is extended inward in the radial direction, then the heat shield coverage is improved, but the heat shield becomes more susceptible to deformation and vibration
Solution Approach 1:
The bead-like structure adds axial dimensionality to the second ring portion, creating elevated portions that extend in the axial direction. This allows the heat shield to maintain extended radial coverage while gaining additional structural rigidity through the three-dimensional bead structure, which resists deformation and vibration despite the larger surface area.
Solution Approach 2:
The bead-like structural features are positioned at specific locations on the second ring portion, providing localized reinforcement where the extended surface area is most susceptible to deformation. This selective reinforcement maintains robustness while preserving the beneficial extended coverage.
Data Source
AI summary
The present invention relates to a heat shield (100) for a supercharging device (1), comprising a first ring portion (110), which is situated at the outside in a radial direction (24) and which is designed to bear the heat shield (100), and a second ring portion (120), which is situated at the inside in a radial direction (24) and which extends from the first ring portion (110). The second ring portion (120) has at least one structure-stiffening feature (200), the at least one structure-stiffening feature (200) being of bead-like form.