Linear Unit Tolerance Compensation via Adjustable Strip
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Solution Overview
Problem
Existing linear units with lightweight metal or metal alloy housings face manufacturing tolerance issues and lack tolerance compensation, leading to inadequate lateral guidance and stability.
Innovation Solution
Incorporating a strip unit with protrusions of varying heights and a contact unit with recesses, allowing for multiple tolerance compensation positions, and optionally using spring elements and guide elements for stabilization, enabling sliding engagement with the slot bottom for improved alignment and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the housing unit is manufactured as an extruded profile element of lightweight metal or alloy, then weight is reduced and ease of manufacture is improved, but manufacturing precision deteriorates due to tolerance accumulation
Solution Approach 1:
The engagement device is segmented into a contact unit and a strip unit that can be adjusted relative to each other. The strip unit can be positioned in multiple discrete positions along the engagement direction, allowing the system to compensate for manufacturing tolerances by selecting the appropriate position rather than requiring high precision in the housing extrusion.
Solution Approach 2:
The engagement position parameter is made variable through the adjustable strip unit. By changing the position of the strip unit relative to the contact unit, the system can adapt to variations in housing manufacturing tolerances, effectively decoupling the precision requirement from the housing manufacturing process.
2Device complexity
If the rotor is guided laterally by contact with the U-shaped profile, then device complexity is reduced, but reliability deteriorates due to inadequate tolerance compensation
Solution Approach 1:
The engagement device transitions from a fixed rigid structure to a dynamic adjustable structure. The strip unit can be repositioned along the engagement direction to compensate for tolerance variations, making the guidance system adaptive rather than static, thereby improving reliability without significantly increasing complexity.
Solution Approach 2:
The engagement device serves multiple functions: it provides lateral guidance, compensates for manufacturing tolerances, and ensures stable rotor positioning. By integrating the adjustment mechanism into the existing engagement structure, the system achieves multiple objectives without proportionally increasing complexity.
3Manufacturing precision
If engagement devices are added for tolerance compensation, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The strip unit is nested within or integrated with the contact unit structure. The protrusions on the strip unit engage with recesses in the contact unit, creating a compact integrated assembly that provides adjustment capability without requiring separate complex mechanisms, thus minimizing the increase in device complexity.
Data Source
AI summary
A linear unit has a substantially rigid housing unit having an engagement slot, a rotor that is received in said housing unit so as to be movable back and forth in a travel direction, the rotor having at least one engagement device which engages the engagement slot in said housing unit in an engagement direction extending substantially orthogonally to the travel direction, the at least one engagement device including not only a contact unit associated with the rotor, but also a strip unit, and means for compensating a position of the strip units relative to the contact unit.