Bicycle Exercise Measurement Device Crankshaft Power Generation
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Solution Overview
Problem
Conventional bicycle exercise measurement devices wear out the rear wheel tire by generating electric power through friction, reducing the tire's service life.
Innovation Solution
A bicycle exercise measurement device that attaches to the bicycle frame, using a generator driven by the crankshaft's rotational input member, connected via a torque-transmitting mechanism, to measure exercise without impairing the tire's durability, incorporating sensors for data computation and display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a rotating member is pushed against the rear wheel to generate electric power through friction, then electric power for exercise measurement can be generated, but the rear wheel tire wears out and service life is reduced
Solution Approach 1:
The patent extracts the power generation function from the rear wheel friction mechanism and relocates it to the crankshaft area. A rotating member is positioned around the crankshaft axis line, separate from the rear wheel, to generate electric power through direct mechanical connection to the crankshaft, eliminating the harmful friction on the rear wheel tire.
Solution Approach 2:
The patent introduces a connecting member as an intermediary to transmit rotational force from the crankshaft to the rotating member. This mediator enables power generation without direct friction between the rotating member and rear wheel, preserving tire integrity while achieving the desired energy conversion.
2Duration of action of stationary object
If a rotating member is positioned around the crankshaft to generate power, then tire durability is preserved, but the device structure becomes more complex
Solution Approach 1:
The rotating member serves multiple functions: it generates electric power for exercise measurement, stores rotational energy, and provides a mounting structure for sensors. This multi-functionality reduces the need for separate components, simplifying the overall device structure while preserving tire durability.
Solution Approach 2:
The rotating member is positioned around the crankshaft axis line, effectively nesting the power generation mechanism within the existing crankshaft structure. The housing is attached to the bicycle frame and contains the generator, creating a compact nested arrangement that minimizes additional space requirements and structural complexity.
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 exercise measurement using an existing bicycle without reducing the tire's durability, allowing effective power generation and pedaling force analysis while maintaining tire longevity.
Implementation Method 1
a generator (54) attached to the housing (52); an annular rotational input member (81) for rotationally driving the generator (54)
Implementation Method 2
a connecting member (90, 140) connecting the rotational input member (81) to the crankshaft (24) or the crank arm (26) in a torque transmitting relationship
Data Source
AI summary
An exercise measurement device comprises a housing for attaching to a frame of a bicycle, a generator, an annular rotational input member for rotationally driving the generator, the rotational input member being rotatably mounted on the housing and positioned around a crank axis line, a connecting member connecting the rotational input member to the crankshaft or the crank arm in a torque transmitting relationship, a sensor for detecting at least one of electric current of the generator, a rotational speed of the generator or the crank arm, a torque of the crank arm, a position of the crank arm, a strain in the crank arm, and a pressure on the pedal, a measurement computing unit for computing at least one of power and a pedaling force from an output of the sensor, and a display unit for displaying a computed value of the measurement computing unit.