Modular Door Drive Attachment for Tolerance Chain Reduction
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Solution Overview
Problem
Existing door drives for garage, garden, and factory doors face inaccuracies due to dimensional tolerances in individual parts, leading to long tolerance chains and requiring separate adjustments of the motor unit for each application, which complicates the adaptation of the drive motor to the door and introduces inefficiencies in shock damping and release mechanisms.
Innovation Solution
A modular door drive system where the output transmission, release clutch, and damping element form a separate drive attachment that can be connected independently to both the motor unit and the door moving element, incorporating a pulse disk for position sensing and a limit switch for release detection, with quick locking devices and variable gear stages to adapt speed ratios without altering the drive attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the output transmission is integrated in the motor unit housing, then the structure is compact, but long tolerance chains are created leading to inaccuracies
Solution Approach 1:
The patent divides the door drive system into separate modular units: the motor unit and the drive attachment with output transmission. This segmentation breaks the long tolerance chain by creating independent manufacturing reference systems, where the drive attachment's transmission housing serves as a new reference point rather than extending tolerances from the motor unit housing.
Solution Approach 2:
The drive attachment acts as an intermediary component between the motor unit and the door moving element. It includes its own transmission housing and connecting means that serve as intermediate reference systems, isolating the transmission elements from the motor unit's tolerance accumulation and enabling independent precision control.
2Adaptability or versatility
If separate adjustments are made for each application, then adaptability to different doors is achieved, but device complexity and adjustment time increase
Solution Approach 1:
The drive attachment is designed as a universal module with standardized connecting means that can interface with various motor units and door moving elements. This universal design allows the same drive attachment to be adapted to different door types and motor units without requiring complex application-specific adjustments, reducing both device complexity and adjustment time.
Solution Approach 2:
The connecting means incorporate adjustable and interchangeable elements that allow dynamic adaptation to different applications. The modular structure enables easy reconfiguration by swapping components or adjusting connection parameters, providing versatility without permanent complex adjustments.
3Manufacturing precision
If the output transmission is separated from the motor unit, then tolerance chains are eliminated and adaptability improves, but device complexity increases due to additional connecting means
Solution Approach 1:
While segmentation creates separate modules, each module is designed with self-contained connecting means that simplify the overall system. The drive attachment includes integrated connecting means for both the motor unit and door moving element, reducing the need for additional external connection components and simplifying assembly despite the modular structure.
4Reliability
If damping element and release clutch are integrated in separate units, then shock damping and release functionality are improved, but assembly complexity increases
Solution Approach 1:
The patent combines the damping element and release clutch within the same drive attachment module, merging previously separate functions into a single integrated unit. This merging maintains the reliability benefits of dedicated damping and release mechanisms while simplifying assembly by reducing the number of separate components and connection points.
Data Source
AI summary
A door drive for garage, garden, hall or factory doors, comprising a motor unit which comprises a drive motor and a motor output shaft, an output transmission, which on the input end can be connected with the motor output shaft and on the output end includes a transmission output shaft for driving a door moving element, in particular a door shaft, a release clutch for releasing the motor output shaft with respect to the door moving element as well as at least one damping element for damping drive shocks. The door drive is characterized in that the output transmission includes a transmission housing formed separate from the motor unit and together with the release clutch and the damping element forms a separate, modular drive attachment, which can be connected on the one hand to the motor unit and on the other hand to the door moving element.