Timepiece Barrel Arbor Core Integration for Power Reserve
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Solution Overview
Problem
Conventional timepiece barrels face challenges in achieving a high power reserve while maintaining rigidity and minimizing component count and machining costs, particularly in reducing the diameter of the barrel arbor and core to accommodate more spring turns without risking breakage.
Innovation Solution
A timepiece barrel design featuring a one-piece sub-assembly with a cobalt-nickel-chromium alloy spring, a collar for pivotal drive, and strategically limited abutments to ensure axial and radial stability, allowing for a reduced arbor diameter without compromising rigidity or increasing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the diameter of the barrel arbor and core is decreased to increase spring turns and power reserve, then the power reserve is improved, but the risk of breakage increases and rigidity deteriorates
Solution Approach 1:
The patent merges the arbor and core into a single integrated component, eliminating the need for separate parts. This integration allows for optimized geometry where the arbor diameter can be reduced while maintaining structural integrity through the unified design, thereby increasing power reserve without compromising rigidity
Solution Approach 2:
The patent employs composite material structures in the arbor-core assembly, utilizing materials with optimized mechanical properties that provide both strength and flexibility. This allows the reduced-diameter design to maintain adequate rigidity while accommodating increased spring turns for higher power reserve
2Duration of action of moving object
If the diameter of the barrel arbor is reduced to accommodate more spring turns, then the power reserve is increased, but the minimum diameter for fatigue resistance is compromised
Solution Approach 1:
By integrating the arbor and core into one piece, the patent eliminates stress concentration points that would occur at the junction of separate components. This unified structure can achieve adequate fatigue resistance at smaller diameters because the entire component can be optimized as a single stress-bearing element
Solution Approach 2:
The patent changes the geometric parameters of the arbor-core assembly, specifically the diameter ratio and cross-sectional area distribution, to optimize the stress distribution. This allows the minimum diameter to be reduced while maintaining fatigue resistance through improved stress distribution across the integrated structure
3Device complexity
If conventional barrel architecture with separate arbor and core components is used, then assembly flexibility is maintained, but component count and machining costs increase
Solution Approach 1:
The patent combines multiple components (arbor and core) into a single integrated piece, directly reducing component count and eliminating the need for additional assembly steps. This integration also reduces machining costs by requiring fewer separate manufacturing operations and eliminating the need for precision fitting and securing of separate components
Data Source
AI summary
A timepiece barrel for pivotal assembly between a plate and a bar and including at least one spring housed between a pivoting drum and a cover and hooked between, at the outer end thereof, the drum and at the inner end thereof, an arbor which pivots integrally with a ratchet about a pivot axis. The barrel includes a one-piece sub-assembly coaxial to the arbor and including the arbor and a boss including a collar for limiting axial shake of the drum, the collar carrying pivotal drive mechanisms for driving pivoting of the ratchet which is axially free in a direction of the pivot axis.