Spherical Four-Bar Linkage Bipod for Stable Robotic Walking
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Solution Overview
Problem
Existing robotic walking apparatuses face challenges in complexity and efficiency, particularly in powering multiple units, due to the need for a large number of operating parts and increased energy consumption.
Innovation Solution
A bipod robotic walking apparatus utilizing a spherical four-bar linkage mechanism with two feet, allowing for efficient movement by minimizing the number of operating parts and reducing energy consumption, enabling operation as a hexapod with only three units through phased linkage connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple robotic walking apparatuses are used to achieve stable movement, then reliability is improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent combines multiple four-linkage mechanisms into a single integrated structure where multiple feet are attached to a common coupler link. This merging approach allows the apparatus to achieve stable multi-point contact with the ground while reducing the total number of separate mechanisms needed, thereby improving reliability without proportionally increasing complexity
Solution Approach 2:
The spherical four-bar linkage mechanism serves multiple functions simultaneously: it provides structural support, enables walking motion, and allows adaptation to different surface conditions through its spherical geometry. This multi-functionality reduces the need for separate specialized components, decreasing overall device complexity while maintaining reliable movement
2Reliability
If multiple robotic walking apparatuses are used to achieve stable movement, then reliability is improved, but energy consumption increases
Solution Approach 1:
By merging multiple four-linkage mechanisms into a single integrated structure with a common power source, the patent reduces the total number of motors and power transmission systems needed. This consolidation maintains reliable multi-point ground contact while significantly reducing energy consumption compared to using separate powered units
Solution Approach 2:
The spherical four-bar linkage mechanism utilizes passive mechanical advantage and ground reaction forces to achieve movement. The mechanism converts rotational motion into efficient walking motion through its geometric constraints, reducing the energy required from active power sources while maintaining stable movement
3Device complexity
If a spherical four-bar linkage mechanism is used, then device complexity is reduced, but achieving stable multi-point contact becomes challenging
Solution Approach 1:
The patent segments the coupler link into multiple feet positioned at different locations. This segmentation allows the single four-linkage mechanism to achieve stable multi-point contact with the ground, resolving the contradiction between simplified mechanism design and reliable ground contact by distributing contact points across the segmented structure
Solution Approach 2:
The patent transitions from planar four-bar linkage to spherical four-bar linkage, adding a dimensional aspect that enables the mechanism to accommodate three-dimensional ground contact requirements. This dimensional change allows stable multi-point contact while maintaining the simplicity of the single-linkage structure
Data Source
AI summary
A bipod robotic walking apparatus consisting of two feet on the coupler link of a spherical four-bar linkage, for movement in a forward or rearward direction by repeated motions of the four-bar linkage. Three four-bar linkages may be connected in tandem to form a hexapod with three points of contact with the ground.