Torque Coupling Lever Wear Reduction
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Solution Overview
Problem
Torque couplings experience significant wear and tear, particularly at the running surfaces of the hollow wheel and clamped elements, limiting their service life.
Innovation Solution
A torque coupling design featuring a shaft, hollow shaft, and spring-loaded levers made from bent steel strips, which are non-rotatably connected to the shaft, and have a bearing head with a circular segment shape that fits into a plastic bearing receptacle, reducing surface roughness and stress from dynamic load changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If levers are made from solid piece of steel, then structural strength is ensured, but surface roughness increases and wear resistance decreases
Solution Approach 1:
The invention changes the manufacturing method parameter from solid piece machining to bending formed steel strip. This parameter change results in inherently smoother surface finish from the rolling process, reducing initial surface roughness and subsequent wear without compromising structural integrity through proper material selection and heat treatment of the steel strip
Solution Approach 2:
The invention employs composite construction by lining the hollow shaft with a steel strip and using plastic bearing receptacles. The steel strip provides smooth running surface and wear resistance, while the plastic bearing receptacle reduces friction. This composite approach addresses both surface roughness and wear resistance requirements simultaneously
2Reliability
If levers are made from solid piece of steel, then manufacturing simplicity is maintained, but inertia increases causing higher stress during dynamic load changes
Solution Approach 1:
The invention changes the geometric parameter of the lever from solid piece to bent strip configuration. This reduces the mass and moment of inertia of the lever, allowing faster response to dynamic load changes with reduced stress. The manufacturing complexity is offset by using standard steel strip bending processes rather than complex solid piece machining
Solution Approach 2:
The lever is segmented from a continuous steel strip rather than being a monolithic solid piece. This segmentation approach allows optimization of the cross-sectional area and distribution of material, reducing unnecessary mass while maintaining structural strength where needed, thereby lowering inertia without requiring entirely new manufacturing processes
3Duration of action of stationary object
If conventional solid-piece lever design is used, then structural integrity is ensured, but wear and tear is significant reducing service life
Solution Approach 1:
The invention uses composite materials approach by combining steel strip for the lever body with plastic bearing receptacles. The steel strip provides structural integrity and smooth running surfaces, while the plastic bearing receptacles reduce friction and wear. This composite construction significantly extends service life by addressing the wear and tear problem through material selection rather than just design modification
Solution Approach 2:
The invention changes the surface parameter by using bent steel strip with inherently smoother surfaces from the rolling process, and changes the bearing material parameter from metal to plastic. These parameter changes reduce both adhesive and abrasive wear mechanisms, leading to significantly reduced wear and tear and extended service life
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 design significantly reduces wear and tear by minimizing surface abrasion and friction, leading to a longer service life and improved durability compared to conventional solid-piece lever designs.
Implementation Method 1
The levers are spring-loaded so as to be pressed against the hollow shaft
Implementation Method 2
A possible explanation for this is seen in the lower surface roughness stemming from the different production methods
Data Source
AI summary
The torque coupling has a shaft, a hollow shaft and a plurality of levers. The bearings of the levers are non-rotatably connected to the shaft and the levers are spring-loaded so as to be pressed against the hollow shaft. The levers are bent from a steel strip.