Micro Head Spindle-Sleeve Assembly for Low Backlash Motion
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Solution Overview
Problem
Existing micro head mechanisms face issues with backlash reduction and structural complexity, with existing solutions either failing to effectively reduce backlash or resulting in poor responsiveness due to inadequate consideration of backlash between spindle and thimble components.
Innovation Solution
A micro head design incorporating a spindle, sleeve, thimble, and backlash absorbing member fixed to the sleeve, utilizing a cylindrical backlash absorbing member with a through hole and anaerobic adhesive for adhesion, and optionally featuring a metallic protective cover for enhanced durability and multiple absorbing members for improved backlash reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressurizing spring and adjusting nut are added to reduce backlash, then backlash reduction effect is achieved, but the structural complexity increases and the device becomes more complex
Solution Approach 1:
The patent extracts and eliminates the pressurizing spring and adjusting nut from the micro head structure, replacing them with a simplified spindle-sleeve assembly that achieves backlash reduction through precise manufacturing tolerances and direct mechanical contact, thereby removing unnecessary components while maintaining reliability
Solution Approach 2:
The patent merges the functions of the spindle and sleeve by creating a tightly integrated assembly where the sleeve incorporates the spindle with minimal clearance, combining what were previously separate components with additional fastening mechanisms into a unified structure that reduces backlash without requiring extra parts
2Reliability
If multiple screw structures are added for backlash reduction, then backlash is reduced, but the entire micro head becomes structurally complex
Solution Approach 1:
The patent removes the additional screw structures and fastening mechanisms from the design, relying instead on the inherent precision of the spindle-sleeve fit and a single retaining screw to maintain positional accuracy and reduce backlash, thereby simplifying the overall structure
Solution Approach 2:
The patent combines multiple functional requirements (backlash reduction, positional accuracy, mechanical strength) into a single integrated spindle-sleeve assembly design, eliminating the need for separate adjustment mechanisms and multiple screw structures
3Reliability
If a complex adjustment mechanism is used to reduce backlash, then backlash reduction is achieved, but responsiveness deteriorates
Solution Approach 1:
The patent eliminates complex adjustment mechanisms including pressurizing springs, adjusting nuts, and engagement pins, creating a direct-drive spindle-sleeve system that responds immediately to input forces without intermediate adjustment components, thereby improving responsiveness while maintaining backlash reduction through precision manufacturing
Solution Approach 2:
The patent merges the adjustment function into the basic spindle-sleeve assembly design itself, where backlash reduction is achieved through the inherent precision fit and rigid mechanical connection rather than through separate adjustment mechanisms, resulting in a more responsive system
Data Source
AI summary
Provided is a micro head having a simple structure and yet entailing extremely little backlash.A micro head includes a spindle, a sleeve, a thimble, a backlash absorbing member, and a collar, wherein the cylindrical backlash absorbing member is fixed to the sleeve in a state where the spindle is inserted at a position in the sleeve.