Elast Belt Eccentric Cam Tensioning for Power Tools
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Solution Overview
Problem
Existing power tools with belt-driven systems face complexity in tensioning device configuration and mounting/demounting processes due to the need for additional springs and components, which increases weight and component count.
Innovation Solution
The use of an elast belt with an eccentric cam tensioning device that secures the tensioning position without additional springs, allowing for simple mounting and demounting by leveraging the inherent tension of the elast belt, and adjustable pulley spacing through a rotatable eccentric cam supported on a bolt or bearing pin, reducing the number of components and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional tensioning device with additional springs is used, then the tensioning device can be secured in the tensioning position, but the device complexity and weight increase
Solution Approach 1:
The patent removes the additional spring component from the tensioning device, extracting the unnecessary element that caused complexity. The elast belt itself is used to secure the tensioning position without requiring separate spring mechanisms, thus simplifying the overall device configuration while maintaining the ability to secure the tensioning position reliably
Solution Approach 2:
The elast belt serves dual functions: it transmits power between pulleys and simultaneously secures the tensioning device in the tensioning position through its inherent elastic properties. This self-service approach eliminates the need for separate spring components, reducing device complexity while maintaining functional reliability
2Reliability
If a conventional tensioning device with additional springs is used, then the tensioning device can be secured in the tensioning position, but the weight of the power tool increases
Solution Approach 1:
The patent extracts and removes the additional spring component that contributed to weight. By using the elast belt's inherent tension to secure the tensioning position, the design eliminates unnecessary weight while maintaining the ability to reliably secure the tensioning position during operation
Solution Approach 2:
The elast belt performs multiple functions including power transmission and securing the tensioning position, eliminating the need for separate spring components. This multi-functionality reduces the overall weight of the power tool while maintaining reliable operation
3Ease of operation
If an elast belt is used, then mounting and demounting becomes simple, but the belt must be expanded against high inherent tension during mounting
Solution Approach 1:
The tensioning device incorporates dynamic movement capability, allowing the belt to be temporarily relaxed during mounting and demounting operations. The movable component enables the belt tension to be adjusted dynamically, making installation easier while maintaining high tension during operation
Solution Approach 2:
The patent changes the tension parameter dynamically through the tensioning device. During mounting and demounting, the tension is reduced to facilitate easy installation, while during operation, the tension is increased to the required level for power transmission
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
This configuration simplifies the tensioning device, reduces weight, and allows for easy adjustment of belt tension and pulley spacing, facilitating a lightweight and space-efficient design with fewer components, enabling straightforward mounting and demounting processes.
Implementation Method 1
the belt is an elast belt and in that the tensioning device as a result of the tension of the elast belt is secured in the tensioning position
Implementation Method 2
the tensioning element is embodied as an eccentric and rotatably supported eccentric cam. By means of the eccentric cam in a simple way different spacings of drive pulley and output pulley can be realized
Data Source
AI summary
A power tool with a drive motor and a drive belt guided about a drive pulley and an output pulley has a tool driven by the drive motor through the drive belt. A tensioning device is provided that changes a spacing between the drive pulley and the output pulley and has at least one tensioning position and at least one release position. In the at least one tensioning position, the drive pulley and the output pulley have a first spacing relative to one another and in the at least one release position have a second spacing to one another that is smaller than the first spacing. The drive belt is an elast belt and the tensioning device, as a result of inherent tension of the elast belt, is secured in the at least one tensioning position.