Ball Screw Spindle Nut Recess Layout for Imbalance Compensation
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Solution Overview
Problem
Ball screw drives experience dynamic imbalance and increased wear due to asymmetrical spindle nut designs, leading to vibrations and operational noise, with existing imbalance compensation methods being costly and complex.
Innovation Solution
The introduction of surface recesses on the outer face of the spindle nut, designed to serve as a groove or stop surface for force transmission elements, which also contribute to imbalance compensation, ensuring the main axis of inertia aligns with the rotational axis, thereby reducing operational noise and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the spindle nut is designed asymmetrically to accommodate ball deflectors and ball return channels, then the ball screw drive can function properly with ball circulation, but the main axis of inertia deviates from the rotational axis causing dynamic imbalance
Solution Approach 1:
The invention intentionally introduces asymmetry through compensation recesses to counterbalance the existing asymmetry from ball deflectors. By creating asymmetric material removal patterns that are mirror-symmetrical and offset by 180°, the design achieves a new asymmetric configuration where the combined center of gravity aligns with the rotational axis, resolving the dynamic imbalance while preserving the asymmetric ball return functionality
2Object-generated harmful factors
If compensation recesses are added to the spindle nut to correct imbalance, then dynamic imbalance is reduced, but the geometry becomes complex and production costs increase
Solution Approach 1:
The compensation recesses are designed to serve multiple functions: they provide imbalance compensation through their asymmetric geometry and distribution, while simultaneously acting as mounting features for ball deflectors or structural elements of the ball return system. This multi-functionality reduces the need for separate compensation components and simplifies the overall manufacturing process
3Object-generated harmful factors
If mirror-symmetrical recesses offset by 180° are provided for imbalance compensation, then the main axis of inertia can be realigned with the rotational axis, but the geometry becomes complex
Solution Approach 1:
The compensation recesses are strategically positioned and dimensioned to create localized material removal patterns that specifically target the imbalance issue. By concentrating the compensation effect in specific regions rather than distributing it uniformly, the design achieves inertia realignment with minimal geometric complexity, allowing the rest of the spindle nut to maintain its functional asymmetric geometry
Data Source
AI summary
A ball screw drive having a threaded spindle and a spindle nut which coaxially encloses it at least partially. The spindle nut receives a ball deflector and therefore has an imbalance caused thereby. A force transmission element is positively connected to the spindle nut. The outer surface of the spindle nut has a recess which is dimensioned and arranged to serve as a stop or groove for the force transmission element and also contributes to the imbalance compensation of the spindle nut. An imbalance compensation method is also provided by fixing the action surface as a surface recess such that the smallest width of the recess is at least 3 times as large as the maximum radial indentation thereof. The filling up of at least parts of the recess by the force transmission element is accounted for and the recess is lengthened along the spindle nut for imbalance reduction.