Guided Spindle Thread Structure for Low-Friction Precision Drives
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Solution Overview
Problem
Existing spindle drives face challenges in precision, manufacturing complexity, susceptibility to corrosion, high friction, and accuracy issues due to the use of metal components, which lead to increased wear and reduced precision.
Innovation Solution
A spindle drive design featuring a threaded spindle with external threads subdivided into multiple threaded areas and guide areas, where the guide areas abut the core diameter of the spindle nut, allowing for precise guidance without additional components and reducing friction, and can be produced using injection molding or other methods, including using plastic materials for improved anti-friction properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal components are used for threaded spindle and spindle nut, then strength and durability are improved, but friction increases and wear occurs leading to reduced precision
Solution Approach 1:
The patent applies composite materials by combining plastic and metal in a single spindle nut component. The plastic portion engages with the threaded spindle to provide low friction and wear resistance, while the metal reinforcement provides structural strength and rigidity. This composite structure resolves the contradiction by achieving both strength and precision simultaneously.
Solution Approach 2:
The patent changes the material parameter from pure metal to a composite plastic-metal structure. By altering the material composition and physical properties of the spindle nut, the invention reduces friction coefficients while maintaining mechanical strength, thereby improving precision without sacrificing durability.
2Strength
If metal components are used for threaded spindle and spindle nut, then load bearing capacity is improved, but susceptibility to corrosion increases
Solution Approach 1:
The spindle nut is constructed as a composite component with plastic and metal portions. The plastic material provides inherent corrosion resistance while the metal reinforcement maintains load bearing capacity. This composite approach resolves the contradiction by combining materials with complementary properties.
3Manufacturing precision
If additional guiding components are added to the spindle drive, then guidance precision is improved, but device complexity increases
Solution Approach 1:
The spindle nut is designed as a multi-functional component that simultaneously provides thread engagement, guidance, and structural support. The guide areas on the spindle nut perform both guidance and positioning functions, eliminating the need for separate guiding components and reducing overall device complexity while maintaining precision.
Solution Approach 2:
The invention merges multiple functions into a single spindle nut component. The guidance function is integrated directly into the spindle nut structure through guide areas, combining what would traditionally require separate guiding components with the fastening function in one unified element.
4Manufacturing precision
If friction is reduced in the spindle drive, then wear is reduced and precision is maintained, but power consumption decreases
Solution Approach 1:
The plastic portion of the composite spindle nut provides low friction engagement with the threaded spindle, reducing wear and maintaining precision over time. The reduced friction also directly lowers the power consumption required to operate the spindle drive mechanism.
Data Source
AI summary
A spindle drive comprising a threaded spindle with an external thread, a spindle nut with an internal thread that is in engagement with the external thread of the threaded spindle, characterized in that 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.