FRP Power Transmission Shaft Keyway Structure for Higher Torque
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Solution Overview
Problem
Existing power transmission shafts face challenges in transmitting large torque due to stress concentration on the FRP cylinder and abutting collar, leading to potential deformation and material differences.
Innovation Solution
A power transmission shaft design featuring an FRP shaft with integrally connected second cylindrical portions and metal flanges, where the protruding portions of the FRP shaft have a larger thickness than the metal keys, along with adhesive portions to equalize material rigidity and suppress deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the thicknesses of the corrugated engagement portions of the FRP cylinder and the abutting collar are made equal, then the structure is simplified and easier to manufacture, but stress concentration occurs and deformation may happen under large torque loads
Solution Approach 1:
The invention applies different thicknesses to different components at the same location: the abutting collar has a larger thickness than the FRP cylinder at the corrugated engagement portions. This local differentiation allows each component to have optimal thickness for its material properties, preventing stress concentration while maintaining manufacturing simplicity.
2Strength
If the thickness of the abutting collar is increased to prevent deformation, then strength under torque load is improved, but the complexity of the structure and manufacturing process increases
Solution Approach 1:
The invention increases the thickness of the abutting collar only at the specific corrugated engagement portions where stress concentration occurs, rather than increasing the thickness of the entire collar. This localized approach improves strength where needed while minimizing overall structural complexity and manufacturing complexity.
Data Source
AI summary
A power transmission shaft of the present disclosure connects two rotating devices with each other, and is capable of transmitting power from one device to the other device. The power transmission shaft comprises an FRP shaft extending around an axis, and a pair of metal flanges connected to the FRP shaft in an axial direction. The FRP shaft has a first cylindrical part, and a pair of second cylindrical parts integrally connected to the first cylindrical part. The second cylindrical parts each have a base part connected to the first cylindrical part, and a plurality of protruding parts that protrude from the base part in the axial direction, the plurality of protruding parts being disposed spaced apart from each other at equal intervals in a circumferential direction and thereby forming, together with the base part, a plurality of keyways extending in the axial direction. The metal flanges each have a connection part that is connected rotatably to a device, and a plurality of keys that protrude from the connection part in the axial direction and individually fit into the keyways. The thickness of the protruding parts in the circumferential direction is larger than the thickness of the keys in the circumferential direction.