Timepiece Maximum-Value Indication Gear Train for Precise Pressure Readings
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Solution Overview
Problem
Existing timepiece mechanisms for measuring ambient pressure face a trade-off between accuracy and compactness, with mechanisms using friction trains being bulky and those with fixed incrementation pitch being inaccurate, leading to uncertainty in maximum pressure readings.
Innovation Solution
A timepiece mechanism utilizing a gear train with a multiplication ratio between the physical variable maximum value display wheel and the indexing wheel assembly, eliminating the need for friction mechanisms and enhancing display resolution while maintaining compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a friction train mechanism is used to indicate maximum pressure, then the mechanism can maintain compact design, but the display resolution and precision are insufficient
Solution Approach 1:
The patent replaces the friction train mechanism with a gear train system that uses gear meshing and indexing mechanisms to achieve maximum value indication. This substitution eliminates the need for friction-based sliding contacts and provides positive engagement through gear teeth, thereby improving display resolution while maintaining mechanical compactness. The gear train with multiplication ratio enables finer angular divisions for more precise maximum pressure reading indication.
2Measurement precision
If a fixed incrementation pitch toothed wheel is used for indexing, then the mechanism structure is simple, but the maximum pressure display accuracy is limited by the angular pitch
Solution Approach 1:
The patent changes the gear ratio parameter of the indexing mechanism to achieve a multiplication effect. By using a gear train with a multiplication ratio (e.g., 6:1 or higher), the angular displacement of the maximum value indicator is amplified relative to the drive mechanism, thereby increasing display resolution and accuracy without requiring a complex overall structure. This parameter optimization allows the indicator to distinguish smaller pressure variations.
3Reliability
If the maximum pressure indicator organ is positioned between two stable indexed positions, then the mechanism structure is compact, but the reading accuracy becomes uncertain during pressure reduction
Solution Approach 1:
The patent introduces an intermediate indexing wheel assembly that acts as a mediator between the drive mechanism and the maximum value indicator. This intermediate gear train with multiplication ratio provides additional indexing positions and smoother transitions between values, eliminating the uncertainty that occurs when the indicator falls between fixed positions. The intermediate gears distribute the indexing across multiple stages, ensuring reliable and precise maximum pressure recording.
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 mechanism improves display resolution of maximum pressure readings with increased precision and compact design, addressing the inaccuracies of existing mechanisms while reducing thickness.
Implementation Method 1
the indexing wheel assembly is kinematically connected to the physical variable maximum value display wheel by a gear train T1, T2
Implementation Method 2
an ambient physical variable measuring device comprising an element configured to mechanically deform under the effect of a variation of said physical variable
Data Source
AI summary
Provided is an ambient physical variable measuring device (5) including an element configured to mechanically deform under the effect of a variation of a physical variable to rotate a physical variable measured value indication train including a physical variable maximum value display wheel (21). An indexing mechanism (40) to index the position of a physical variable maximum value display train (24) at each advance, the indexing mechanism (40) comprising a blocking organ (41) cooperating with an indexing wheel assembly (43). The the indexing wheel assembly (43) is kinematically connected to the physical variable maximum value display wheel (21) by a gear train T1, T2 and in that the gear ratio of the gear train T1, T2 between the physical variable maximum value display wheel (21) and the indexing wheel assembly (43) is a multiplication ratio.