Sprint Trainer Gearbox and Magnetic Damping for Smooth Pedal Strokes
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Solution Overview
Problem
Existing leg trainers for sprint training experience unsmooth operation due to reduced damping force at the initial pedal stroke, leading to an empty feeling and increased tolerance between chains and sprockets, resulting in an unsmooth workout experience.
Innovation Solution
The exerciser incorporates a frame with a driving assembly featuring a gear box and cranks, a damping assembly with a flywheel and adjustable damper, and a linkage assembly allowing cranks to swing in reverse directions, providing a consistent and controlled damping effect to enhance the training experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed damper composed of chains and sprockets is used, then damping function is provided, but tolerance increases causing unsmooth operation
Solution Approach 1:
The patent replaces the mechanical chain-sprocket damping system with a magnetic damping system. The magnetic damper uses magnetic fields to provide damping force without physical contact, eliminating tolerance issues between moving parts while maintaining the damping function. This substitution of mechanical system with magnetic field-based system resolves the contradiction between providing damping function and ensuring smooth operation.
2Force
If tension wheels are moved outward by belt tensions, then damping force is reduced, but this causes empty feeling and unsmooth operation
Solution Approach 1:
The patent replaces the mechanical belt-tension wheel system with a magnetic damping system. The magnetic damper provides consistent damping force through magnetic field interaction without the mechanical components that cause force variation and empty feeling. This eliminates the contradiction between maintaining damping force and ensuring operation smoothness.
3Power
If multiple transmission components are used, then power transmission is achieved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical transmission components with a magnetic damping system that provides both damping function and power transmission through magnetic field interaction. This substitution reduces device complexity while maintaining power transmission capability, as the magnetic system eliminates multiple mechanical components.
4Reliability
If chains and sprockets are used for damping, then damping effect is provided, but tolerance increases causing unsmooth feeling
Solution Approach 1:
The patent replaces the mechanical chain-sprocket system with a magnetic damping system. The magnetic damper uses magnetic field interaction that is not affected by mechanical tolerance, providing consistent damping effect without the unsmooth feeling caused by tolerance accumulation in mechanical components.
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
The combination of the gear box, damping assembly, and linkage assembly ensures a smooth and effective workout by maintaining a consistent damping force and reducing the unsmooth feeling associated with initial pedal strokes, thus enhancing muscle strength and power training.
Implementation Method 1
The unidirectional bearings are mounted respectively on two ends of the input axle, such that the input axle can be driven to rotate undirectionally by the unidirectional bearings
Implementation Method 2
The damping assembly is connected to the driving assembly to provide a damping effect to the driving assembly
Implementation Method 3
The transmission gear sets are mounted between and engaged with the input gear and the output gear
Implementation Method 4
a damping assembly with a flywheel and adjustable damper
Implementation Method 5
With the magnetic force provided by the magnetic members, a damping effect can be provided to the flywheel 31
Data Source
AI summary
An exerciser has a frame, a driving assembly, a damping assembly, and a linkage assembly. The frame has a base, a front supporting rod, and a rear supporting rod, and a grip assembly. The driving assembly is mounted on the frame and has a gear box and two cranks. The gear box is mounted in the rear supporting rod and has a box body, an input axle, an input gear, two unidirectional bearings, an output gear, and multiple transmission gear sets. The input axle is mounted rotatably in the box body. The input gear is co-axially mounted securely on the input axle. The unidirectional bearings are mounted respectively on two ends of the input axle. The transmission gear sets are mounted between and engaged with the input gear and the output gear. Each crank has a first end connected with one of the unidirectional bearings.