Arrester Device Eccentric Auxiliary Worm Gear
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Solution Overview
Problem
Existing arrester devices for closing apparatus, such as doors, are complex and costly due to their high number of parts, leading to increased assembly effort and costs, while aiming to provide maximum operating security with a simple construction.
Innovation Solution
An arrester device with a worm gear rotationally fixed to an output shaft and a self-locking worm, featuring an auxiliary worm gear placed on an eccentric region of the output shaft, which rotates and self-locks upon failure, eliminating wear and allowing for a single-part, cost-effective assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an auxiliary worm gear is added to provide operating security, then reliability is improved, but device complexity increases
Solution Approach 1:
The auxiliary worm gear is integrated onto the output shaft of the existing worm gear drive, merging two functional components into a single unified structure. The auxiliary worm gear is positioned on an eccentric region of the output shaft, allowing it to rotate freely during normal operation and engage only when needed, thus providing reliability enhancement without proportionally increasing complexity
Solution Approach 2:
The output shaft serves multiple functions: it transmits the driving torque from the worm gear to the winding shaft and simultaneously supports the auxiliary worm gear for the arresting function. This multi-functionality reduces the need for separate structural elements, thereby limiting the increase in device complexity while maintaining improved reliability
2Reliability
If multiple parts are used to ensure security, then reliability is improved, but assembly effort and cost increase
Solution Approach 1:
By combining the auxiliary worm gear with the output shaft through integration, the number of separate parts is reduced. The auxiliary worm gear can be mounted directly onto the output shaft without requiring additional mounting brackets, fasteners, or complex assembly fixtures, thereby simplifying the manufacturing and assembly processes while maintaining the security function
3Duration of action of stationary object
If the auxiliary worm gear runs along without load, then wear is reduced, but the structure becomes more complex
Solution Approach 1:
The auxiliary worm gear is designed to rotate freely on the eccentric region of the output shaft during normal operation, allowing it to move dynamically without bearing the full load. This dynamic configuration ensures that the auxiliary worm gear and its teeth experience minimal wear during normal operation, while still providing the arresting function when the support element fails
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 solution provides enhanced operating security with a simplified structure, independent of speed, direction, or installed position, and reduces assembly costs by utilizing a single part, ensuring effective load braking through friction without wear.
Implementation Method 1
An auxiliary worm gear (20) is additionally placed on an eccentric region (16) of the output shaft (10), with the auxiliary worm gear (20) likewise having an eccentricity of the same amount and being mounted such that the eccentricities cancel out with respect to the axis (18) of the output shaft (10)
Implementation Method 2
a self-locking worm (26) which is in communication with an input shaft (2)
Data Source
AI summary
The present disclosure relates to an arrester device for closing apparatus, such as doors, comprising a worm gear rotationally fixedly connected to an output shaft serving as a winding shaft and a self-locking worm which is in communication with an input shaft. In accordance with the present disclosure, an auxiliary worm gear is seated on an eccentric region of the output shaft with clearance, with the auxiliary worm gear having an eccentricity of the same amount as the output shaft and being assembled such that the eccentricities are cancelled with respect to the axis of the output shaft, with the auxiliary worm gear being able to follow the movement of the worm gear without load via its toothed region.