Bicycle Control Device Drop Handlebar Integration
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Solution Overview
Problem
Conventional bicycle control devices cannot be mounted on drop handlebars used in road races, as they lack a gripping portion that allows riders to operate both braking and shifting functions effectively.
Innovation Solution
A bicycle control device with a housing member featuring a gripping portion and a hydraulic oil pressure generator integrated inside, allowing for hydraulic braking and cable-actuated shifting operations, which can be attached to a drop handlebar, utilizing a control lever system with pivotable axes to distinguish and perform both braking and shifting operations reliably.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional support member configuration is used, then the control device can be mounted on a bar handle, but it cannot be mounted on a drop handlebar with a gripping portion
Solution Approach 1:
The control device is designed with a housing member that integrates multiple functions: it serves as the structural support, provides a gripping portion for rider hand placement, and accommodates the hydraulic oil pressure generator. This multi-functional design enables the device to be mounted on drop handlebars while maintaining ease of operation through direct hand gripping.
2Stability of the object's composition
If the cylinder is provided inside the housing member, then the shape of the housing member does not deform readily, but the space requirement increases
Solution Approach 1:
The hydraulic oil pressure generator, including the cylinder, is nested inside the housing member. This nesting arrangement allows the cylinder to be accommodated within the existing housing volume without causing external deformation, while the housing member's structural design maintains stability despite the internal component.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable operation of both braking and shifting functions on a drop handlebar, providing improved control and integration of hydraulic braking and cable shifting within a compact design that maintains structural integrity and reduces manufacturing costs.
Implementation Method 1
a hydraulic oil pressure generator (21) having a cylinder (30) provided inside the gripping portion (20b) of the housing member (20), and a piston (31) capable of moving within the cylinder (30)
Data Source
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AI summary
A control device 12 can be mounted on a drop handlebar 13, and can control a braking device and a rear derailleur, the control device 12 comprises a housing member 20, a hydraulic oil pressure generator 21, a control lever member 22, and a shifting operation mechanism, wherein the housing member 20 can be attached to the drop handlebar 3, the hydraulic oil pressure generator 21 has a cylinder 30 provided inside a gripping portion 20b of the housing member 20 and a piston 31 capable of moving within the cylinder 30, and the hydraulic oil pressure generator controls the control device 12, the control lever member has a first operation lever 37 for operating the piston, the first operation lever being connected to the housing member so as to be capable of pivoting a first axis X1, the shiftin operation mechanism is mounted on the control lever member 22 and controls a shift cable capable of being connected to a rear derailleur.