Helical Spring Pressing Device for Current Collector Stability
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Solution Overview
Problem
Existing pressing devices for current collectors using rubber elements as springs lose their spring effect quickly, require frequent replacement, and fail to provide stable positioning of the contact shoe unit relative to the current rail, leading to unreliable energy transfer due to undesirable vibrations and movements.
Innovation Solution
A pressing device with a rotatable rocker unit and a helical spring as the spring unit, which generates a large and stable pressing force without losing springiness over time, allowing for less frequent replacement and improved positioning of the contact shoe unit, with the helical spring being pre-tensioned only when necessary and securely connected to a shaft for reliable guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a rubber element is used as a spring unit, then the pressing device can be simple in structure, but the spring effect is lost quickly requiring frequent replacement
Solution Approach 1:
The patent changes the material parameter from rubber element to helical spring, transforming the spring mechanism from elastomeric deformation to mechanical coil deformation. This parameter change resolves the contradiction by providing a spring unit that maintains its spring effect over time while keeping the overall device structure relatively simple.
2Volume of moving object
If a rubber element is used as a spring unit, then the device can be compact, but the contact shoe unit positioning is unstable causing vibrations and movements
Solution Approach 1:
The patent changes the spring mechanism parameter from rubber-based to helical spring-based, which fundamentally alters the stiffness and damping characteristics. The helical spring provides more stable elastic properties that reduce vibrations and movements of the contact shoe unit, thereby improving positioning stability while maintaining compact device dimensions.
3Ease of manufacture
If a rubber element is used as a spring unit, then the initial setup can be simple, but pre-tensioning is required to generate adequate pressing force
Solution Approach 1:
The patent changes the spring unit from rubber element requiring pre-tensioning to a helical spring that can be directly installed in a compressed state. The helical spring's mechanical structure allows it to generate adequate pressing force immediately upon installation without requiring additional pre-tensioning operations, thereby improving ease of operation while keeping the initial setup process simple.
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 helical spring-based pressing device ensures a stable and reliable sliding contact with the current rail, reducing the need for frequent replacements and minimizing undesirable vibrations, thereby ensuring consistent energy transfer with reduced risk of contact interruptions.
Implementation Method 1
The spring unit has a helical spring rotatably biasing the rocker unit about an axis, such that the contact shoe unit is movable in only one direction into a sliding contact position
Data Source
AI summary
A pressing device for a current collector moves a contact shoe unit is movable relative to a current rail. The pressing device includes a rocker unit and a spring unit. The spring unit having a helical spring rotatably biasing rocker unit is rotatable such that the contact shoe unit is movable into a sliding contact position in only one direction spring unit.