Watch Winding Device Unidirectional Coupling Simplified Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional one-way couplings used in watchmaking for winding barrels are complex and expensive due to their intricate design, particularly the Breguet type coupling, which requires a delicate and costly driven pinion with straight radial teeth.
Innovation Solution
A simplified one-way coupling design that eliminates the need for an intermediary winding pinion by using a pinion with a Breguet toothing mounted on a winding stem, which directly engages with a crown wheel having internal saw teeth, allowing for a two-way coupling mechanism without an intermediate piece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Breguet type coupling is used to transmit rotational movement between transmission members with perpendicular axes, then reliable one-way transmission is achieved, but the device becomes complex and expensive due to the intricate driven pinion with straight radial teeth
Solution Approach 1:
The invention merges the functions of the driven pinion and crown wheel into a single crown wheel component with integrated straight toothing and saw-toothed toothing. This eliminates the separate driven pinion with complex straight radial teeth, reducing the number of parts while maintaining the one-way transmission function through the elastic member's engagement with the saw-toothed toothing.
Solution Approach 2:
The invention extracts and eliminates the complex driven pinion with straight radial teeth from the Breguet coupling mechanism. By integrating the necessary functions into the crown wheel and using the elastic member for one-way engagement, the design removes the delicate and costly component without compromising transmission reliability.
2Reliability
If a Breguet type coupling with straight radial teeth is used, then proper one-way engagement is achieved, but manufacturing cost and difficulty increase due to the delicate nature of the driven pinion
Solution Approach 1:
The invention combines the engagement surfaces and functional elements into the crown wheel structure itself. The straight toothing and saw-toothed toothing are both integrated into the same component, eliminating the need to manufacture a separate driven pinion with delicate straight radial teeth, thereby simplifying the manufacturing process.
Solution Approach 2:
The invention replaces the expensive, delicate driven pinion with a more manufacturable crown wheel design that uses standard toothing techniques. The elastic member provides the necessary one-way engagement without requiring precision-machined straight radial teeth, reducing manufacturing costs and complexity.
3Reliability
If an intermediary winding pinion is used in the Breguet coupling, then proper transmission between perpendicular axes is achieved, but the device size and complexity increase
Solution Approach 1:
The invention merges the intermediary winding pinion function directly into the crown wheel by providing both straight toothing for engagement with the pinion and saw-toothed toothing for one-way engagement with the elastic member. This integration eliminates the need for a separate intermediary component, reducing device size while maintaining proper transmission between perpendicular axes.
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
This design simplifies the winding device by eliminating the need for a costly winding pinion, reducing complexity and size, while maintaining effective rotational movement transmission from a perpendicular axis, preventing improper barrel manipulation.
Implementation Method 1
provided with a first saw-toothed toothing, movable between a first time-setting position and a second winding position and positioned axially in the winding position (B) by an elastic member
Data Source
Figure 1~3
Figure 2
AI summary
A sliding pinion (20) is mounted on a winding stem (22) with a rotational axis (XX) and is fitted with a saw-like contrate toothing (30). The pinion is mobile between time-setting and winding positions, and is positioned in the winding position by a pull-out piece (24) and a lever (26). A crown wheel (32) has a rotational axis (YY) that is perpendicular to the rotational axis of the stem. The wheel is fitted with a saw-like inner toothing (34) that is meshed with the saw-like contrate toothing in the winding position to form a single direction coupling device.