Drive Shaft Tube Joint Structure for Uniform Torque Transfer
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Solution Overview
Problem
The existing drive shaft joint structures made of carbon fiber composite materials suffer from low power torque bearing capability due to uneven circumferential shear stress distribution, leading to stress concentration and reduced fatigue durability.
Innovation Solution
A shaft tube joint structure with a convex and concave tube configuration, utilizing inner and outer adhesive rubber rings with variable thickness distributions to evenly distribute circumferential shear stress, allowing for double-sided bonding and improved torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If single-sided overlapping adhesive bonding is used between the shaft tube and universal joint extension tube, then the manufacturing process is simple, but the power torque bearing capability is low due to stress concentration
Solution Approach 1:
The bonding structure is segmented into inner and outer bonding surfaces. The shaft tube and extension tube form an inner bonding surface, while the added convex and concave tubes create an outer bonding surface. This segmentation allows the bonding task to be distributed across multiple surfaces, reducing stress concentration on a single surface and improving overall torque bearing capability.
Solution Approach 2:
The bonding interface is extended from a single-sided planar contact to a dual-sided three-dimensional configuration. By adding the convex tube protruding from the shaft tube end and the concave tube recess in the extension tube, the bonding occurs in both inner and outer dimensions simultaneously, effectively utilizing spatial volume to distribute stresses.
2Ease of manufacture
If uniform wall thickness carbon fiber shaft tube is used, then the manufacturing is straightforward, but the stress distribution in the bonding seam is uneven
Solution Approach 1:
Instead of attempting to create a non-uniform shaft tube wall thickness, the patent applies local quality by adding localized structural features (convex and concave tubes) at the bonding interface. This allows the main shaft tube to remain uniformly manufactured while the bonding region gains enhanced stress distribution characteristics through the protruding and recessed structures.
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 proposed structure enhances the power torque bearing capability by eliminating stress concentration and ensuring uniform stress distribution, thereby improving the overall performance and durability of the drive shaft joint.
Implementation Method 1
an inner adhesive rubber ring disposed between the convex tube and the extension tube, and an outer adhesive rubber ring disposed between the concave tube and the extension tube
Data Source
AI summary
A shaft tube joint structure of a drive shaft is disclosed. The structure includes an extension tube, a shaft tube, a convex tube, a concave tube, an inner adhesive rubber ring and an outer adhesive rubber ring; the extension tube and the shaft tube are abutted to each other; the convex tube is sleeved in the extension tube and the shaft tube at the abutting position therebetween, an inner seam having a variable gap size distribution is formed in an axis direction; the concave tube is sleeved on the extension tube and the shaft tube at the abutting position therebetween, an outer seam having a variable gap size distribution is formed in the axis direction. The inner adhesive rubber ring and the outer adhesive rubber ring are fully used for simultaneously transmitting a power torque, thus improving the power torque bearing capability of the shaft tube joint structure.