Cast-In Fastener Indicators for Error-Proof Engine Assembly
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Solution Overview
Problem
In complex machine systems like internal combustion engines, manual assembly and reassembly processes often result in errors due to the use of incorrect fasteners, which can lead to performance issues and damage, as existing indicator systems are not effectively integrated into the machine components and can wear off or be obscured.
Innovation Solution
The integration of indicators directly into machine components through casting, which provide distinct features to indicate the appropriate fastener characteristics for each hole, eliminating the need for additional processing and ensuring correct fastener placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If painted marks are added to indicate fastener types, then the likelihood of user error is reduced, but the marks wear away over time, become obscured with dust or debris, and are difficult to discern in low-light conditions
Solution Approach 1:
The indicator feature is integrated directly into the machine component during the molding process, merging the indicator with the component itself. This eliminates separate painted marks that wear away, creating a permanent, durable indicator that becomes part of the component structure and cannot be separated or degraded independently.
Solution Approach 2:
The indicator feature is formed during the initial molding of the machine component, before the component is assembled or used. This preliminary formation ensures the indicator is present from the start and remains throughout the component's service life without requiring subsequent application or maintenance.
2Reliability
If additional processing is performed to create marks on the part surface, then fastener identification is improved, but manufacturing cost increases and errors may be introduced
Solution Approach 1:
The indicator feature is combined with the machine component itself and formed during the same molding process. This integration eliminates the need for separate marking operations, reducing manufacturing steps, lowering costs, and minimizing opportunities for errors to be introduced during additional processing.
Solution Approach 2:
The molding process serves multiple functions: it creates the machine component structure while simultaneously forming the indicator feature. This multi-functionality reduces the total number of manufacturing operations required and simplifies the overall manufacturing process.
3Loss of information
If indicators are formed as separate physical components, then they can provide fastener information, but they do not provide information for identifying where a certain fastener should be placed on the part itself
Solution Approach 1:
The indicator feature is merged with the machine component during molding, creating an integrated system where the indicator and component are unified. This ensures the indicator is permanently associated with the correct location on the part, eliminating the risk of mismatched or misplaced indicators that could lead to incorrect fastener placement.
Data Source
AI summary
An assembly system for an internal combustion engine system includes a first fastener having a first characteristic, a second fastener having a second characteristic that is different than the first characteristic, and a casting forming a component of the internal combustion engine system, the casting defining a surface. The assembly system also includes a first hole and a second hole each formed in the casting, a first diameter of the first hole being substantially the same as a second diameter of the second hole such that the first fastener is insertable into the first hole and into the second hole. The assembly system also includes a first indicator cast together with the surface, the first indicator having a first feature that indicates the first characteristic, and a second indicator cast together with the surface, the second indicator having a second feature that indicates the second characteristic.