Combined-Drive Bicycle Handle Mechanism for Independent Power Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional bicycles primarily provide great leg exercise benefits but limited arm exercise benefits and are hindered by complex structures, speed inconsistencies, and unnatural arm movement, with the steering shaft being affected by handle rotation.
Innovation Solution
A combined-drive bicycle design featuring a handle assembly with a crank handle generating motive force, a pedal assembly for transmitting force to the rear wheel, and a motive force transmission part that separates handle and steering operations, using bevel gears and universal joints to ensure independent and efficient power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the handle is rotated to generate motive force, then arm exercise benefits and driving speed are improved, but the steering shaft is affected and cannot be steered properly
Solution Approach 1:
The bicycle system is divided into independent functional modules: the handle assembly for steering, the crank handle assembly for power generation, and the pedal assembly for power transmission. The motive force transmission part transmits power from the crank handle to the pedal assembly independently of the steering mechanism, allowing simultaneous steering and power generation without interference
Solution Approach 2:
The motive force transmission part acts as an intermediary mechanism that transfers rotational force from the crank handle to the pedal assembly through a series of gears and universal joints. This intermediary system decouples the power generation function from the steering function, enabling the handle to rotate for power generation without affecting steering shaft operation
2Productivity
If the structure is improved to enable arms and legs to work multiply, then exercise benefits and driving speed are improved, but the structure becomes complex and speeds of front and rear wheels become inconsistent
Solution Approach 1:
The handle assembly serves dual functions: steering the front wheel and generating motive force through the crank handle. The pedal assembly similarly handles both direct pedal power and transmitted handle power. This multi-functionality allows arms and legs to work together without requiring completely separate systems
Solution Approach 2:
The power transmission system maintains continuous rotational motion through the gear train and universal joints, ensuring that motive force from the crank handle is continuously transmitted to the pedal assembly and rear wheel, enabling sustained exercise and consistent wheel speeds
3Power
If the handle is rotated for power generation, then arm exercise is improved, but the pedal shaft and steering shaft are adversely affected by the rotation
Solution Approach 1:
The bicycle is segmented into independent rotational systems: the handle assembly rotates independently for steering and power generation, the crank handle rotates independently to generate motive force, and the pedal assembly rotates independently to transmit power. This segmentation prevents adverse rotational effects from propagating between shafts
Solution Approach 2:
The motive force transmission part with its gear train and universal joints serves as an intermediary that isolates the crank handle rotation from the pedal shaft and steering shaft. The universal joints specifically accommodate angular misalignments and prevent rotational interference between different shafts
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 increased driving speed and exercise benefits while allowing natural arm and leg movement, preventing steering interference from handle rotation and allowing intuitive application of handle and pedal forces.
Implementation Method 1
The first power transmission member may include a first universal joint coupled to the second gear; an inner spline coupled to the first universal joint; an outer spline sliding-rotated with the inner spline; and a second universal joint having an end coupled to the outer spline and the other opposite end coupled to an end of the intermediate connection member.
Implementation Method 2
at least one guide projection may be formed along an outer circumferential surface of the inner spline and at least one projection accommodating recess to engaging with the at least one guide projection may be formed along an inner circumferential surface of the outer spline, to enable the inner spline and the outer spline to be rotated together, with sliding-moving linearly together.
Implementation Method 3
A combined-drive bicycle design featuring a handle assembly with a crank handle generating motive force, a pedal assembly for transmitting force to the rear wheel, and a motive force transmission part that separates handle and steering operations, using bevel gears and universal joints to ensure independent and efficient power transmission.
Data Source
AI summary
There is disclosed a combined-drive bicycle which can increase a driving speed and the beneficial effects of exercise and simultaneously to give fun to a rider. The combined-drive bicycle includes a handle assembly configured to steer a front wheel, the handle assembly comprising a crank handle to generate a handle motive force and a first gear rotated by the rotation of the crank handle, a pedal assembly configured to transmit the handle motive force and a pedal motive force generated by pedals to a rear wheel selectively or simultaneously, and a motive force transmission part to transmit the handle motive force to the pedal assembly, irrelevant to the steering of the handle assembly.