Propshaft Yoke Adhesive Bonding for Aluminum Distortion Control
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Solution Overview
Problem
Existing propshaft assembly welding processes, such as MIG and friction welding, are inefficient for materials like 7XXX aluminum alloys, causing strength reduction and distortion, and existing adhesive-based methods are not suitable for high-volume commercial production.
Innovation Solution
A propshaft assembly with a yoke and propshaft tube where the yoke is adhesively coupled using an adhesive groove and injection port, with the yoke and propshaft tube heated to a minimum adhesive injection temperature for effective bonding, allowing for a slip-fit and interference-fit assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding processes (MIG or friction welding) are used to couple the yoke to the propshaft tube, then the joint strength is improved, but the propshaft tube strength is reduced and distortion occurs
Solution Approach 1:
The patent replaces the welding process (thermal/mechanical system) with an adhesive bonding process (chemical system). The adhesive is injected through injection ports into the bond cavity between the yoke and propshaft tube, creating a strong joint without the harmful thermal effects of welding. This substitution eliminates distortion while maintaining joint strength.
Solution Approach 2:
The adhesive acts as an intermediary substance between the yoke and propshaft tube. Rather than directly joining the metal components through welding, the adhesive mediates the connection, distributing stresses and avoiding the concentrated heat input that causes distortion in welding processes.
2Manufacturing precision
If adhesives are used to bond the yoke to the propshaft tube, then the propshaft tube strength is preserved and distortion is avoided, but the process is not suitable for high volume manufacture
Solution Approach 1:
The patent incorporates injection ports and bond cavities into the yoke and propshaft tube design before assembly. These features are pre-formed during manufacturing, enabling rapid adhesive injection and curing processes. The preliminary preparation of bonding surfaces and injection pathways allows the adhesive process to achieve high-volume production capability while preserving propshaft tube strength.
Solution Approach 2:
The adhesive bonding process is designed to be self-contained within the assembly operation. The injection ports are integrated into the components themselves, and the adhesive is applied automatically during the assembly process without requiring separate preparation or finishing steps, enabling high-volume manufacturing.
3Reliability
If adhesives are injected into an injection port and pressure is maintained for 5 to 10 minutes, then the adhesive is fully driven into the space between the tube and end fitting, but the process is not suited for high volume commercial production
Solution Approach 1:
The yoke and propshaft tube are pre-assembled with the bond cavity and injection ports in place before adhesive injection. This preliminary assembly creates an optimized flow path for the adhesive, allowing rapid filling of the bond cavity without requiring prolonged pressure maintenance. The pre-configured geometry enables high-volume production while ensuring complete adhesive distribution.
Solution Approach 2:
The patent changes the parameters of the adhesive injection process by using integrated injection ports and optimized bond cavity geometry. These design modifications allow for higher injection pressures and faster flow rates, reducing the injection time from 5-10 minutes to a duration suitable for high-volume production while maintaining complete adhesive bonding.
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
This method provides a strong and distortion-free bond suitable for high-volume production, overcoming the limitations of traditional welding methods and enabling efficient assembly of propshaft assemblies with challenging materials like 7XXX aluminum alloys.
Implementation Method 1
The adhesive is disposed in the adhesive groove and the first injection port and adhesively couples the yoke to the propshaft tube
Implementation Method 2
heating the propshaft tube and the yoke; and injecting an adhesive through the propshaft tube into the adhesive groove when the propshaft tube and the yoke are at a temperature that is greater than or equal to a predetermined minimum adhesive injection temperature
Implementation Method 3
The first locating portion is sized to slip fit with the inner tubular surface
Implementation Method 4
The second locating portion engages the inner tubular surface by way of an interference fit
Data Source
AI summary
A method for forming a propshaft assembly that includes: providing a propshaft tube having a wall member that defines an inner tubular surface; providing a yoke with a yoke body and a pair of yoke arms that extend from the yoke body, the yoke body defining first and second locating portions and an adhesive groove that is disposed between the first and second locating portions; assembling the yoke to the propshaft tube such that the first locating portion engages the inner tubular surface in a slip-fit manner and the second locating portion engages the inner tubular surface in an interference-fit manner; heating the propshaft tube and the yoke; and injecting an adhesive through the propshaft tube into the adhesive groove when the propshaft tube and the yoke are at a temperature that is greater than or equal to a predetermined minimum adhesive injection temperature. A propshaft assembly is also provided.