Variable Length Link Device for Kinematic Systems
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Solution Overview
Problem
Existing kinematic systems require links that can vary in length during operation to achieve complex transmission relationships between rotary movements, while also being compatible with fixed-length link replacements without modifying the system.
Innovation Solution
A controllable variable length link device comprising two half-links connected by a rotary displacement member with a rotator shaft and bearing means, allowing for length adjustment through rotation, and guide members for precise translation, enabling substitution in existing kinematic systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a link of constant length is used in a kinematic transmission system, then the system structure is simple and easy to manufacture, but the transmission relationship between rotary movements cannot be complex
Solution Approach 1:
The link is divided into two separate half-links that can move independently relative to each other. This segmentation allows the link to achieve variable effective length while maintaining a relatively simple overall structure, resolving the contradiction between transmission complexity and structural simplicity
Solution Approach 2:
The link transitions from a static constant length to a dynamic variable length through the relative movement of the two half-links. The rotary displacement member enables dynamic adjustment of the link's effective length during operation, allowing complex transmission relationships without requiring a complex overall structure
2Adaptability or versatility
If a link of variable length is used to achieve complex transmission relationships, then the adaptability of the kinematic system is improved, but the link cannot be modified when operating and requires system modification
Solution Approach 1:
The link achieves variable length through dynamic movement of the two half-links during operation. The rotary displacement member allows the effective length to change continuously while the link is operating, eliminating the need to stop or modify the link structure
Solution Approach 2:
The link device can function both as a constant length link (when half-links are fixed relative to each other) and as a variable length link (when half-links move relative to each other). This multi-functionality allows it to replace conventional links without modifying the rest of the kinematic system
3Adaptability or versatility
If a link device with rotary displacement member is used to enable length variation during operation, then the adaptability and transmission complexity are enhanced, but the device complexity increases
Solution Approach 1:
The link device is segmented into two half-links connected by a rotary displacement member, allowing independent movement of each half-link. This segmentation enables dynamic length adjustment while keeping each component relatively simple in structure
Solution Approach 2:
The rotary displacement member acts as an intermediary between the two half-links, enabling length variation through rotational movement. This intermediary mechanism provides a simple way to achieve complex functionality without requiring a completely complex overall structure
Data Source
AI summary
A controllable variable length link device is disclosed. The device includes a first half-link having a first end connected to a driving system and a second end, a second half-link having a first end connected to a driven system and a second end, a rotary displacement member including a rotator shaft and a rotary head cooperating with the second ends of the half-links to bring about opposite movement of the half-links, a bearing unit in which the rotator shaft is mounted, respective guiding units which guide the two half-links in translation in at least two parallel directions, the guiding units being mechanically connected to the bearing means; and a driving unit which drives the shaft in rotation in both directions in accordance with a predetermined relationship.