Two-Part Spindle Nut Structure to Prevent Thread Jamming
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Solution Overview
Problem
Spindle drives used in louvre windows and shutters face issues with increased thread resistance and jamming due to transverse forces, leading to efficiency loss and wear, especially when dealing with high loads and tolerance deviations in manufacturing.
Innovation Solution
A spindle drive design featuring a two-part spindle nut with a screw nut part and a bearing part that allows relative movement transverse to the thread axis, incorporating a spherical or cylindrical joint for load distribution and axial stops, along with a twist lock to prevent rotation, ensuring smooth operation even under transverse forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the spindle drive is designed to handle high loads with tight tolerances, then the driving force and torque capacity is improved, but the thread resistance increases and jamming occurs due to transverse forces
Solution Approach 1:
The spindle nut is divided into two separate parts: a screw nut part that engages with the threaded spindle and a bearing part that houses the screw nut part. This segmentation allows the screw nut part to focus on thread engagement while the bearing part accommodates the spherical or cylindrical joint that compensates for transverse forces, preventing jamming while maintaining high load capacity
Solution Approach 2:
A spherical or cylindrical joint is introduced as an intermediary element between the screw nut part and the bearing part. This joint acts as a mediator that absorbs and compensates for transverse forces and tolerance deviations, allowing the threaded connection to operate smoothly without jamming while still transmitting the driving force effectively
2Manufacturing precision
If ultra-narrow tolerances are applied in manufacturing the spindle drive, then the running exactness is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The invention changes the degree of freedom parameter of the screw nut part by allowing it to execute relative movements including transverse components. This parameter change compensates for tolerance deviations in manufacturing, reducing the need for ultra-narrow tolerances while maintaining running exactness
Solution Approach 2:
A spherical or cylindrical joint is introduced to replace rigid fixed connections. The curved surfaces of this joint allow for automatic alignment and compensation of tolerance deviations, reducing manufacturing complexity while maintaining running exactness without requiring ultra-narrow tolerances
3Stability of the object's composition
If the spindle nut is fixed rigidly to prevent transverse movement, then the structural stability is improved, but the thread flanks experience uneven load distribution and increased wear
Solution Approach 1:
The screw nut part is designed with dynamic capability to execute relative movements including transverse components with respect to the bearing part. This dynamic design allows the system to adapt to transverse forces and maintain even load distribution on thread flanks, preventing premature wear and extending service life while maintaining operational stability
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 reduces friction losses, decreases power consumption, and extends the service life of the spindle drive by preventing wedging and jamming, allowing for a smaller, more cost-effective motor and reduced wear on components.
Implementation Method 1
incorporating a spherical or cylindrical joint for load distribution
Implementation Method 2
This design reduces friction losses
Data Source
AI summary
A spindle drive, a spindle nut for the spindle drive, and a louvre window or louvre shutter having a spindle drive for moving louvre elements. The spindle nut is constructed in multiple parts including a screw nut part, having an internal thread to engage on an external thread of the threaded spindle, and a bearing part in which the screw nut part is mounted. The screw nut part includes a driver structure for transmitting a drive force applied by the threaded spindle to the spindle nut onto an element to be driven. Furthermore, the screw nut part is rotatably mounted in the bearing part in such a way that the screw nut part executes a relative movement in relation to the bearing part, and a directional component of the movement is transverse to a thread longitudinal axis of the internal thread.