Linear Driver Guide Structure for Lead Screw Coaxiality
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Solution Overview
Problem
Existing linear drivers for electric furniture suffer from relative tilt between the lead screw and worm wheel, leading to power source suffocation during worm wheel rotation.
Innovation Solution
The linear driver incorporates a guide structure that ensures the coaxiality of the lead screw and worm wheel, using guide holes and/or sleeves to prevent tilting, along with supporting members and lubrication to maintain smooth movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lead screw and worm wheel are used for linear motion transmission, then the folding and lifting functions are achieved, but relative tilt between the lead screw and worm wheel causes power source suffocation
Solution Approach 1:
A guide structure is introduced as an intermediary component between the lead screw and worm wheel. This guide structure includes a guide sleeve and guide holes that constrain the relative motion between these components, preventing tilt and ensuring proper alignment during operation, thereby resolving the reliability issue while maintaining the folding and lifting functions
2Productivity
If the worm wheel rotates to drive the lead screw, then linear motion is achieved, but coaxiality cannot be ensured without additional guide structures
Solution Approach 1:
The guide structure acts as a mediator that enforces coaxiality between the lead screw and worm wheel during rotation. The guide sleeve and guide holes provide geometric constraints that maintain proper alignment, ensuring manufacturing precision is achieved through the intermediary guide structure rather than relying solely on direct manufacturing tolerances
3Stability of the object's composition
If guide structures are added to ensure coaxiality, then stability is improved, but device complexity increases
Solution Approach 1:
The guide structure is designed to perform multiple functions simultaneously: it guides the lead screw, supports the worm wheel, maintains coaxiality, and prevents tilt. By making the guide structure multi-functional, the patent achieves improved stability without proportionally increasing device complexity, as a single component system handles multiple critical tasks
Data Source
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AI summary
Provided are a linear driver for electric furniture and electric furniture. The linear driver for electric furniture includes a housing, a worm (12) with one end extending into the housing, a worm wheel (13) disposed in the housing and meshing with the worm (12), and a lead screw (14). The lead screw (14) penetrates through the worm wheel (13) and is in threaded connection with the worm wheel (14). At least one end of the lead screw (14) extends out of the housing. At least one end of the worm wheel (3) is provided with a guide structure. The guide structure (3) is sleeved around the lead screw (14) and is in clearance fit with the lead screw (14). The guide structure (3) is fixed relative to the worm wheel (13) or the housing.