Exercise Bicycle Planar Four-Bar Linkage Seat Dynamics
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Solution Overview
Problem
Exercise bicycles lack amusement functions and fail to enhance the body-building effect effectively, as they do not provide a varied or engaging workout experience.
Innovation Solution
The exercise bicycle incorporates a planar four-bar linkage mechanism with a seat that undergoes periodic combined movement with translation and rotation, utilizing crank-rocker, crank-slider, or crank-swing block mechanisms, allowing the seat to move in sync with the rider, along with adjustable pedal crank angles and lengths, and the option to pedal or pull with the instep, combined with an animal model for enhanced realism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional exercise bicycle with a fixed seat is used, then the structure is simple and easy to manufacture, but the amusement function is lacking and the body-building effect is not strengthened
Solution Approach 1:
The seat is transformed from a fixed position to a dynamic position that moves periodically with combined translation and rotation. The connecting rod connects the seat to the crank mechanism, allowing the seat to follow the periodic motion trajectory generated by the crank's rotation, thereby enhancing the amusement function while maintaining reasonable structural complexity
Solution Approach 2:
The exercise bicycle merges the seat function with the crank mechanism by directly connecting them through a connecting rod. This combination allows the seat to simultaneously serve as both a support for the rider and a component that participates in the periodic motion, eliminating the need for separate amusement mechanisms and keeping the overall structure compact
2Productivity
If the seat is fixed on the bicycle frame, then the structure is simple, but the workout experience is not engaging and muscle engagement is limited
Solution Approach 1:
The seat is transformed from a static component to a dynamic one that undergoes periodic combined motion. By connecting the seat to the crank mechanism through a connecting rod, the seat naturally follows the periodic motion trajectory, engaging multiple muscle groups including core, leg, and arm muscles, thereby enhancing workout effectiveness without requiring complex additional mechanisms
Solution Approach 2:
The connecting rod serves multiple functions: it transmits force from the pedals to the crank mechanism, simultaneously supports and moves the seat, and guides the periodic motion trajectory. This multi-functionality enhances workout effectiveness while avoiding the need for separate dedicated components for each function
Data Source
AI summary
An exercise bicycle is provided with a planar four bar linkage with cranks. The bicycle frame (5) is used as the machine frame of the planar four bar linkage, the seat (2) of the bicycle is fixed on a connecting rod (8) of the planar four bar linkage, and the connecting rod (8) is not directly connected with the bicycle frame (5). A middle axle (10) is used as the crank shaft, and one end of the connecting rod (8) is rotationally connected with a crank pin journal of the crank shaft (10), the other end thereof is connected with the member of the bicycle frame (5). The seat of the bicycle can do periodic movement with translation and rotation while a person rides the bicycle.