Spindle Drive Reverse-Lock Mechanism for Louver Return Torque
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Solution Overview
Problem
Spindle drives for motor-driven louver elements in louvered windows or shutters face challenges in absorbing increasing return forces and torques, particularly in larger systems, where existing solutions often require more powerful drive motors or additional measures to safely compensate these forces without overloading the motor.
Innovation Solution
A spindle drive with a return stop mechanism that decouples return forces and torques from the drive motor, using a concentrically arranged drive and output element with radially protruding driving protrusions and slots, and rolling elements that create a wedging effect to lock against return forces and torques, allowing these to be absorbed by the housing and connected structures without motor load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more powerful drive motors are used to compensate return forces and torques, then the reliability of holding louver elements in position is improved, but the device complexity and cost increase
Solution Approach 1:
The drive system is segmented into two independent functional parts: the drive motor responsible for movement, and the return stop mechanism responsible for absorbing return forces. This segmentation allows each component to be optimized for its specific function, eliminating the need for an oversized motor and reducing overall system complexity.
Solution Approach 2:
The return stop mechanism acts as an intermediary component between the threaded spindle and the drive motor. It intercepts and absorbs return forces before they can be transmitted to the motor, protecting the motor from excessive loads while maintaining reliable position holding.
2Reliability
If more powerful drive motors are used to compensate return forces and torques, then the reliability of holding louver elements in position is improved, but the cost increases
Solution Approach 1:
By segmenting the load-bearing function from the drive motor to the dedicated return stop mechanism, the motor can be sized appropriately for its actual function (movement), reducing cost. The return stop mechanism uses simple, inexpensive components like rolling elements and mechanical stops.
Solution Approach 2:
The return stop mechanism uses simple, replaceable components such as rolling elements and mechanical stops that are inexpensive to manufacture. These components can be easily replaced if worn, providing a cost-effective solution compared to investing in an oversized expensive motor.
3Device complexity
If the drive motor is used to absorb return forces, then the system is simpler, but the motor efficiency decreases due to continuous load
Solution Approach 1:
The return stop mechanism serves as an intermediary that absorbs return forces mechanically, preventing them from reaching the drive motor. This allows the motor to operate only during active movement phases, maintaining high efficiency by eliminating continuous idle loading.
Solution Approach 2:
The return stop mechanism is a passive, self-activating system that automatically engages to absorb return forces without requiring motor intervention. The rolling elements and mechanical stops provide automatic protection, allowing the motor to remain unloaded during positioning phases.
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 return stop mechanism effectively locks against both left- and right-rotating return forces and torques, providing robust and reliable self-locking without additional actuators, enabling the use of high-efficiency threaded spindles and reducing the size and cost of motor-gear units while enhancing energy efficiency and burglar protection.
Implementation Method 1
rolling elements that create a wedging effect to lock against return forces and torques
Data Source
AI summary
The invention relates to a refinement of a spindle drive (1), and to a louvered window or a louvered shutter having a spindle drive for moving louver elements such that applied return forces and return torques can be absorbed better, and in particular without placing a load on the drive motor. For this purpose, the spindle drive (1) has a specially designed return stop mechanism (6) arranged between a drive shaft of a drive motor (3) and a threaded spindle (4).