Toggle-Lever Belt Tensioning for Tool-Free Ratio Changes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing belt tensioning devices in agricultural machines, such as combine harvesters, require tools to transition the drive belt from a tensioned state to a relaxed state and vice versa, limiting operational flexibility.
Innovation Solution
A belt tensioning device designed as a toggle lever with a tensioning spring and rotatable components, allowing for manual adjustment without tools, featuring a lever for pivoting the tensioning spring between tensioned and relaxed states, and a stop for locking the tensioned state, ensuring reliable belt tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional belt tensioning device is used, then the drive belt can be maintained under tension, but tools are required to transition between tensioned and relaxed states
Solution Approach 1:
The tensioning device employs a dynamic toggle lever mechanism that can be manually pivoted between extended (tensioned) and retracted (relaxed) positions. This dynamic structure allows the belt to be easily transitioned between tensioned and relaxed states without tools, while maintaining structural integrity during operation
Solution Approach 2:
The tensioning device is segmented into distinct functional components: the toggle lever, tensioning spring, roller holder, and locking mechanism. This segmentation allows each component to perform its specific function independently while enabling easy manual operation for belt tension adjustment
2Adaptability or versatility
If the tensioning spring is constantly engaged, then the belt remains tensioned for reliable power transmission, but the belt cannot be easily released for transmission ratio changes
Solution Approach 1:
The toggle lever provides a dynamic switching mechanism that allows the tensioning spring to be engaged or disengaged from the roller holder at will. This enables reliable belt tension during operation while allowing easy release for transmission ratio changes by simply pivoting the lever
Solution Approach 2:
The tensioning spring automatically maintains belt tension when engaged through its elastic pre-tension, requiring no additional actuators or complex control systems. The system self-regulates belt tension through the spring's inherent elastic properties
3Device complexity
If a simple tensioning mechanism is used, then the device complexity is reduced, but the reliability of belt tension maintenance deteriorates
Solution Approach 1:
The tensioning spring provides continuous elastic feedback to the roller holder, automatically adjusting belt tension in response to load variations. This simple elastic feedback mechanism ensures reliable tension maintenance without complex control systems
Solution Approach 2:
The tensioning spring is pre-loaded with elastic energy before engagement, providing immediate tensioning force when the toggle lever is actuated. This beforehand cushioning ensures reliable belt tension from the moment of engagement without requiring complex tensioning mechanisms
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 seamless transition of the drive belt between tensioned and relaxed states without requiring tools, enhancing operational efficiency and convenience in adjusting gear ratios and maintaining belt tension.
Implementation Method 1
a tension spring (19) which is designed and arranged to exert a tensioning force on the tension roller holder (20) for tensioning the drive belt (13)
Implementation Method 2
the belt tensioning device (17) is designed as a toggle lever for tensioning the tension spring (19)
Implementation Method 3
a tensioning roller (18), which interacts directly with the drive belt (13) and which, under the influence of the tensioning element's pre-tension, is pressed against the drive belt (13)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a belt drive (7) for an agricultural machine (1), in particular a self-propelled combine harvester, comprising at least two pulleys (15), wherein the pulleys (15) are coupled to each other by means of an endless drive belt (13), a belt tensioning device (17), wherein the belt tensioning device (17) comprises a tension roller holder (20) which is rotatably mounted at one end about a first axis of rotation (21) and which mounts a tension roller (18) for tensioning the drive belt (13) at the other end, wherein the belt tensioning device (17) comprises a tension spring (19) which is provided and arranged to exert a tensioning force on the tension roller holder (20) for tensioning the drive belt (13), wherein the belt tensioning device (17) is designed as a toggle lever for tensioning the tension spring (19).