Plastic Threaded Spindle for Electronic Dosing Drive
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Solution Overview
Problem
Electronic dosing devices face challenges in manufacturing complexity, susceptibility to corrosion, increased friction, and reduced dosing accuracy due to the complex manufacturing of threaded spindles, which are prone to wear and plastic deformation.
Innovation Solution
The electronic dosing device features a threaded spindle with multiple threaded areas separated by flattenings, which engage with the internal thread of the spindle nut, providing dual guidance and reducing the need for additional guiding components, and is made from materials like plastics or metals to enhance precision and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threaded spindle is used in the dosing drive, then the plunger can be driven in the cylinder, but the spindle is susceptible to corrosion and wear, increasing friction and reducing dosing accuracy
Solution Approach 1:
The patent replaces the traditional metal threaded spindle with a plastic threaded spindle. This substitution eliminates the corrosion and wear problems associated with metal spindles, as plastic materials are inherently resistant to these degradation mechanisms. The plastic spindle maintains the necessary mechanical function of driving the plunger while avoiding the harmful effects of corrosion and wear that plague metal alternatives.
Solution Approach 2:
The patent changes the material parameter of the spindle from metal to plastic. This material parameter change fundamentally alters the spindle's interaction with the environment and operating conditions. The plastic material provides different friction characteristics, corrosion resistance, and wear properties compared to metal, thereby resolving the technical contradiction between reliability and susceptibility to harmful factors.
2Device complexity
If a threaded spindle with continuous thread is used, then the drive mechanism is simple, but the spindle is prone to plastic deformation under overload and loses precision
Solution Approach 1:
The patent divides the continuous thread of the spindle into multiple separate thread sections. This segmentation allows the spindle to better absorb and distribute overload forces, preventing plastic deformation that would occur in a continuous thread design. Each thread section can independently handle load variations, maintaining dosing precision even under adverse operating conditions while keeping the overall structure relatively simple.
3Manufacturing precision
If additional guiding components are added to the spindle drive, then dosing accuracy is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent designs the plastic threaded spindle to serve multiple functions simultaneously: it provides the driving mechanism through its thread engagement, acts as a guiding element for the plunger, and functions as a wear-resistant component. By making the spindle multi-functional, the patent eliminates the need for separate guiding components, thereby maintaining dosing accuracy without increasing device complexity or manufacturing cost.
Solution Approach 2:
The patent merges the guiding function with the driving function in a single component - the plastic threaded spindle. Instead of having separate components for driving and guiding, the spindle's thread geometry and material properties inherently provide both functions. This merging reduces the total number of components while maintaining or improving dosing accuracy.
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 improves dosing accuracy, reduces wear, and decreases power consumption while allowing for easier production and maintenance, as the plastic threaded spindle minimizes friction and corrosion, leading to enhanced operational reliability and precision.
Implementation Method 1
a threaded spindle (28) with an external thread for driving a plunger in a cylinder, wherein the external thread has multiple threaded areas (31.1, 31.2) that are separated from each other by first flattenings (30.1, 30.2) on their circumference extending in the longitudinal direction
Implementation Method 2
the first flattenings (30.1, 30.2) have guide areas (34.1, 34.2, 34.3, 34.4) that abut the core diameter of the internal thread of the spindle nut (29)
Data Source
AI summary
An electronic dosing drive comprising a support structure, a threaded spindle with an external thread for driving a plunger, at least one first guide element is firmly connected, and is guided parallel to the threaded spindle on a second guide element, a spindle nut having an internal thread is engaged with the external thread of the threaded spindle, an electric drive motor having a motor shaft is coupled with the spindle nut and is attached to the support structure, an electric control apparatus is connected to the electric drive motor, where the external thread of the threaded spindle has multiple threaded areas that are separated from each other by first flattenings on their circumference extending in the longitudinal direction, and the first flattenings have guide areas that abut the core diameter of the internal thread of the spindle nut.