Composite Spline Gear Assembly for Misalignment and Torque Transfer
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Solution Overview
Problem
Conventional gear systems face challenges in maintaining alignment, leading to stress concentrations, premature wear, and failure under high loads, while existing solutions compromise between misalignment compensation and torque transfer capacity, often increasing complexity, cost, and noise.
Innovation Solution
A geared torque transmission system combining a metallic toothed ring gear with thermoplastic or powder metal spline gears, featuring a radially extending rib for alignment and a locking assembly for secure connection, allowing for improved damping, self-alignment, and resistance to radial and axial forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single-material gear systems are used, then manufacturing simplicity is maintained, but misalignment compensation capability is insufficient leading to stress concentrations and premature failure
Solution Approach 1:
The gear system combines metallic components (toothed ring gear, flanged hub, locking assembly) with thermoplastic or powder metal spline gears to create a composite material system. The metallic parts provide structural strength and durability, while the thermoplastic/powder metal components provide damping and misalignment compensation, resolving the contradiction between reliability and complexity.
Solution Approach 2:
Different materials are strategically assigned to different components based on their specific functional requirements. Metallic materials are used where high strength and load-bearing capacity are needed (ring gear, hub, locking assembly), while thermoplastic or powder metal materials are used where damping and misalignment accommodation are critical (spline gears). This localized material optimization achieves superior misalignment compensation without requiring complete system redesign.
2Manufacturing precision
If misalignment compensation mechanisms are added, then tolerance for manufacturing errors is improved, but torque transfer capacity is reduced
Solution Approach 1:
The composite material system allows simultaneous optimization of both misalignment compensation and torque transfer. The metallic components maintain structural integrity and load-bearing capacity for high torque applications, while the thermoplastic/powder metal spline gears provide flexibility and damping to accommodate manufacturing errors and misalignment, preventing the trade-off present in single-material systems.
Solution Approach 2:
The material properties are strategically selected to change key parameters: thermoplastic and powder metal materials provide lower stiffness and higher damping compared to metals, enabling misalignment compensation. Meanwhile, the metallic components maintain high strength parameters for torque transfer. This parameter optimization across different materials resolves the contradiction between manufacturing precision tolerance and strength.
3Object-generated harmful factors
If elastomeric materials are used for damping, then noise is reduced, but load-bearing capability deteriorates under high loads
Solution Approach 1:
The system uses a composite material architecture where thermoplastic or powder metal materials (providing damping and noise reduction) are combined with metallic materials (providing high load-bearing capability). This allows the gear system to simultaneously achieve noise reduction through damping while maintaining high load-bearing capacity through the metallic components, resolving the contradiction present in pure elastomeric solutions.
Data Source
AI summary
A geared torque transmission system including a shaft for transmitting torque, a ring and spline gear assembly, and a flanged hub connecting the ring and spline gear assembly to the shaft. The ring and spline gear assembly includes a toothed ring gear having an inner ring and a radially extending rib centrally located within the inner ring of the toothed ring gear. A first spline gear having an outer circumference with outer spline teeth configured to fit in the inner gear grooves of the toothed ring gear and abut the radially extending rib. A second spline gear has outer spline teeth configured to fit in the inner gear grooves of the toothed ring gear and abut the radially extending rib. The first spline gear and the second spline gear are made of a thermoplastic material and/or a powder metal material. A locking assembly including the flanged hub and a threaded disc is configured to lock the first spline gear and the second spline gear to the toothed ring gear.