Turbocharger Adjusting Device Pivot Joint Locking
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Solution Overview
Problem
Exhaust gas turbochargers face reliability and wear issues due to temperature variations and physical vibrations, leading to loosening of connections and increased noise, which reduce operational reliability and service life.
Innovation Solution
A pivotally interconnected adjusting apparatus with a pin-shaped connecting element and a locking element that applies tensile stress, reducing wear and space requirements, and allowing for a more compact design with reduced material thickness, while positioning the locking element away from heat sources to minimize heat exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking element applies compressive stress to connect adjusting members, then the connection is secured, but the locking element is exposed to high temperatures near the combustion product duct, reducing reliability
Solution Approach 1:
A heat shield is introduced as an intermediary component between the locking element and the hot exhaust gas duct. The heat shield absorbs and blocks thermal radiation, protecting the locking element from direct heat exposure while allowing the locking mechanism to function reliably in the high-temperature environment
2Reliability
If adjusting members are connected with fixed connections to prevent loosening, then operational reliability improves, but wear increases due to vibrations and pulsations
Solution Approach 1:
The connection between adjusting members is designed to be dynamically adaptable rather than rigidly fixed. The system allows controlled movement and adjustment in response to vibrations and pulsations, preventing stress concentration and wear while maintaining operational reliability through the dynamic compensation of thermal and mechanical variations
3Stability of the object's composition
If the locking element is positioned near the duct for combustion product to secure the connection, then connection stability is achieved, but temperature variations cause loosening and stress
Solution Approach 1:
The heat shield serves as a thermal intermediary that decouples the locking element from direct thermal exposure. This allows the locking element to maintain stable mechanical connection while being thermally isolated from the combustion product duct, preventing temperature-induced loosening and stress
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces wear and increases the service life of the adjusting apparatus and the entire turbocharger, while also lowering costs through a simpler and more cost-effective configuration.
Implementation Method 1
a locking element which secures this bolt in its position by means of a tensile stress acting in both directions of a longitudinal axis of the connecting element
Implementation Method 2
The repetitive temperature variations lead to a continual change in the expansion of the components
Implementation Method 3
physical vibrations may also occur. Since the exhaust gas turbocharger is mechanically connected with the combustion engine, these physical vibrations may be accompanied by disturbing noise
Data Source
AI summary
In an adjusting device for an exhaust gas turbocharger with a first adjusting member and a second adjusting member for operating a valve element for varying the flow cross-section of a bypass duct of a flow-through exhaust gas guide portion of a turbine of an exhaust gas turbocharger, the first adjusting member and the second adjusting member are connected so as to be pivotable relative to one another by a pin-shaped connecting element with a locking element establishing a pivot joint of the first adjusting member and the second adjusting member with a predetermined axial engagement force.