Silent Chain Wire Bending Resistance Oscillation Control
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Solution Overview
Problem
Existing power transmission chains face challenges in restraining chordal oscillation and simplifying assembly due to complex structures and increased width from prior art solutions like leaf springs and torsional coil springs.
Innovation Solution
A power transmission chain with a wire extending along the length of the chain, providing bending resistance through elastic deformation across multiple connecting pins, which simplifies the structure and assembly by eliminating the need for separate bending-restraining mechanisms on each connecting pin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a leaf spring is used to couple adjacent connecting pins to restrain chordal oscillation, then the engagement collision sound is decreased and chordal oscillation is restrained, but the width of the chain is increased and the assembly work becomes troublesome due to caulking requirements
Solution Approach 1:
The patent merges the bending-restraining function into the connecting pin structure itself by forming a bent portion directly on the connecting pin that engages with the link plate. This eliminates the need for separate leaf springs and their associated caulking operations, thereby reducing assembly complexity while maintaining the chordal oscillation restraint function.
Solution Approach 2:
The patent extracts the bending-restraining function from separate components (leaf springs) and integrates it into the connecting pin design. The bent portion of the connecting pin directly engages with the link plate to provide the necessary restraint against chordal oscillation, simplifying the overall structure and reducing assembly steps.
2Object-affected harmful factors
If a leaf spring is used to couple adjacent connecting pins, then chordal oscillation is restrained, but the width of the chain is increased
Solution Approach 1:
The patent combines the connecting pin and bending-restraining elements into a single integrated component. The bent portion of the connecting pin engages with the link plate to restrain chordal oscillation without requiring additional width for separate spring components, thus maintaining a compact chain width.
3Length of moving object
If a torsional coil spring is used for each connecting pin to decrease chain width, then the chain width is reduced, but the structure and assembly work become complicated and troublesome
Solution Approach 1:
The patent merges the bending-restraining function into the connecting pin structure itself by forming a bent portion directly on the connecting pin. This eliminates the need for separate torsional coil springs on each connecting pin, thereby reducing structural complexity and assembly work while maintaining compact chain width.
Solution Approach 2:
The patent extracts the bending-restraining function from separate torsional coil springs and integrates it into the connecting pin design. The bent portion of the connecting pin directly engages with the link plate to provide the necessary restraint, simplifying the overall structure.
4Object-affected harmful factors
If opposite end portions of the leaf spring are fixedly attached to the end portions of the connecting pins, then the bending-restraining function is achieved, but caulking is required which makes assembly work troublesome
Solution Approach 1:
The patent extracts the bending-restraining function from separate leaf springs and integrates it into the connecting pin design. The bent portion of the connecting pin directly engages with the link plate through interference fit, eliminating the need for caulking operations and simplifying assembly.
Solution Approach 2:
The connecting pin's bent portion self-anchors into the link plate through interference fit, achieving the bending-restraining function without requiring external fastening operations like caulking. The structure serves itself by utilizing the elastic deformation and interference fit between the bent portion and the link plate aperture.
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
Effectively controls lateral oscillation and reduces impact sound during engagement with sprockets, while reducing the number of components and simplifying the assembly process.
Implementation Method 1
The wire is engaged with the connecting pins in such a way that bending resistance due to elastic deformation of the wire is applied to the chain during articulation of the chain
Data Source
AI summary
A silent chain includes a plurality of inside links each having a pair of teeth and pin apertures and connected to each other by connecting pins inserted into the pin apertures. At least three adjacent connecting pins have a wire extending substantially along the length of a chain. The wire is engaged with the connecting pins in such a way that bending resistance due to elastic deformation of the wire is applied to the chain during articulation of the chain.