Bicycle Operating Device Pulling Force Piston
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Solution Overview
Problem
Existing bicycle operating devices face challenges in efficiently transmitting pulling forces to hydraulic components, limiting the strength and functionality of bicycle components, and often require complex structures to accommodate pivot and movement mechanisms.
Innovation Solution
A bicycle operating device comprising a hydraulic cylinder, piston, and operating unit that converts pulling forces into hydraulic pressure, with a pivotable operating member and piston rod configuration that simplifies construction and reduces space usage, allowing for stable and efficient operation of both hydraulic and non-hydraulic bicycle components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the piston is configured to receive a pushing force, then the structure can be simpler, but the strength of the piston and transmitting members is reduced
Solution Approach 1:
The patent inverts the conventional approach by configuring the piston to receive a pulling force instead of a pushing force. This is achieved through the operating member (lever) that pivots about an axis and transmits pulling force to the piston via a piston rod, thereby improving the strength and reliability of the hydraulic component while maintaining structural feasibility through the lever mechanism
2Adaptability or versatility
If a single operating device controls only hydraulic components, then the structure is simpler, but the functionality is limited
Solution Approach 1:
The operating device is designed with multi-functionality to control both hydraulic components (via the piston and hydraulic cylinder) and non-hydraulic components (via the operating unit with cable). The operating member and support member can selectively engage with either the piston rod or the operating unit, allowing a single device to perform multiple functions without requiring separate control mechanisms for each component type
3Volume of moving object
If the piston rod moves with changing orientation, then the mechanism is more flexible, but the space required is increased
Solution Approach 1:
Instead of allowing the piston rod to change orientation during movement, the patent constrains the piston rod to move only in the axial direction while maintaining constant orientation. The flexibility and range of motion are achieved through the operating member (lever) that pivots about an axis, transferring the rotational movement to linear piston movement without requiring the piston rod itself to change orientation, thereby reducing the space required
Data Source
AI summary
A bicycle operating device comprises a hydraulic cylinder, a piston, and an operating unit. The hydraulic cylinder includes a cylinder bore. The piston is provided in the cylinder bore and is movable relative to the hydraulic cylinder. The piston is configured to receive a pulling force to generate a hydraulic pressure to a bicycle hydraulic component. The operating unit is configured to actuate at least one bicycle component different from the bicycle hydraulic component.