Tensioning Pulley Arrangement with Intensifying Device
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Solution Overview
Problem
Existing tensioning pulley systems for belt drives face challenges in maintaining optimal belt tension, leading to either unwanted slippage during high dynamic loads or excessive frictional losses at low loads, as they require a trade-off between dynamic load tensioning and low-load friction reduction.
Innovation Solution
A tensioning pulley arrangement with two pulleys and an intensifying device that adjusts spring force based on the distance between the pulleys, using a second spring device in parallel with the first spring device to increase tension during high loads and maintain low tension at low loads, thereby reducing slippage and friction losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pretension is applied to the belt drive to prevent slippage during dynamic loads, then slippage is reduced, but frictional losses increase during low-load operations
Solution Approach 1:
The patent applies the dynamics principle by implementing a tensioning pulley arrangement where the pretension force is not fixed but dynamically adjustable. The first and second tensioning pulleys can be positioned at variable distances from each other, allowing the spring force to be intensified when needed. This enables the system to adapt the belt tension according to actual load conditions, applying high tension during dynamic loads to prevent slippage while maintaining lower tension during low-load operations to reduce frictional losses.
Solution Approach 2:
The patent implements parameter changes by modifying the spring force parameter through the intensifying device. The distance between the first and second tensioning pulleys serves as a controllable parameter that directly affects the spring force magnitude. By varying this distance, the system can change the pretension force parameter to match operational requirements, thus resolving the contradiction between maintaining high tension for slippage prevention and reducing tension for energy efficiency.
2Device complexity
If a simple spring preloading system is used, then device complexity is reduced, but the ability to adapt to varying load conditions deteriorates
Solution Approach 1:
The patent applies the merging principle by combining multiple spring devices (first spring device and second spring device) and multiple tensioning pulleys (first and second tensioning pulleys) into a unified tensioning system. This merged structure allows the system to achieve adaptability to varying load conditions while maintaining relative simplicity. The combination of these components creates an intensifying device that can adjust spring force without requiring complex mechanical or electronic control systems.
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 solution allows for efficient belt tensioning across a wide range of operating conditions, minimizing slippage during peak loads and reducing frictional losses during low-load operations, ensuring reliable and energy-efficient belt drive operation.
Implementation Method 1
a first tensioning pulley and a second tensioning pulley tensioning a belt with a spring force and a spring preload force generated by a first spring device coupled to the first and second tensioning pulleys
Implementation Method 2
The intensifying device may include a second spring device coupled to the first and second tensioning pulleys in parallel with the first spring device, the second spring device providing variable tensioning forces based on the distance between the first and second tensioning pulleys
Data Source
AI summary
The tensioning pulley arrangement for a belt drive in an engine, is provided. In one example, the tensioning pulley arrangement includes a first tensioning pulley and a second tensioning pulley tensioning a belt with a spring force and a spring preload force generated by a first spring device coupled to the first and second tensioning pulleys. The tensioning pulley arrangement further includes an intensifying device that decreases belt tension during low belt load conditions and increases belt tension during high belt load conditions. In this way, friction losses during low belt loads may be reduced and belt slippage caused by high belt loads and/or dynamic shifts in belt loads may also be reduced.