Turbocharger Turbine Guide Apparaxial Radial Movement
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Solution Overview
Problem
Turbines with variable turbine geometry (VTG) face issues due to housing deformations caused by mechanical overloading and temperature-related stresses, leading to high friction, corrosion, and reduced efficiency, as guide vanes directly contact the housing, preventing proper adjustment of the flow cross section.
Innovation Solution
A guide apparatus comprising a guide vane bearing ring and a guide vane cover ring, mounted axially and radially moveably in the housing, decouples the housing from the guide vanes, allowing for material relaxation and reducing stresses, with axial and radial preloads to secure the apparatus in place, preventing wobbling and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If guide vanes are directly mounted on the housing, then the structure is simple, but housing deformations cause high friction and corrosion reducing reliability
Solution Approach 1:
A guide vane bearing ring is introduced as an intermediary component between the housing and the guide vanes. This bearing ring is mounted moveably on the housing and carries the guide vanes, thereby decoupling them from direct contact with the housing. This intermediary structure prevents housing deformations from directly affecting the guide vanes, reducing friction and corrosion while maintaining operational reliability.
2Stability of the object's composition
If guide apparatus is rigidly fixed in the housing, then positioning is stable, but thermal expansion and mechanical stresses cause deformations and friction
Solution Approach 1:
The guide apparatus is designed with dynamic mounting characteristics. The guide vane bearing ring is mounted moveably on the housing, allowing it to adapt to thermal expansion and mechanical stresses. This dynamic mounting enables the guide apparatus to maintain stable positioning while accommodating deformations through controlled movement, preventing friction and operational issues.
3Reliability
If guide vanes are spaced far from the housing, then friction and corrosion are reduced, but the flow cross section adjustment precision deteriorates
Solution Approach 1:
The guide vane bearing ring serves as a precise intermediary that carries the guide vanes at an optimized distance from the housing. This intermediate structure allows the guide vanes to be positioned sufficiently far from the housing to reduce friction and corrosion, while the bearing ring itself provides the precision needed for accurate flow cross section adjustment. The bearing ring acts as a stable reference frame that maintains manufacturing precision despite the increased spacing.
Data Source
AI summary
The invention relates to a turbine (1), in particular of an exhaust gas turbocharger, having a turbine rotor (4), which is rotatably mounted in a housing (2), with which at least one radial inlet channel (9) for a guide apparatus (7) forming a medium which drives the turbine rotor (4) is associated, wherein said guide apparatus (7) has multiple guide vane bearing rings (10), which radially enclose said turbine rotor (4) and have guide vanes (8) which lie in said inlet channel (9), and a guide vane cover ring (12), and wherein said inlet channel (9) is axially delimited by said guide vane bearing ring (10) and said guide vane cover ring (12) and said guide apparatus (7) is mounted in the housing (2) so it is axially and/or radially movable for material relaxation. Furthermore, the invention relates to an exhaust gas turbocharger, in particular for a motor vehicle.