Forestry Winch Ejector Roller Pressing Elements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional forestry winches require a more powerful drive motor on the ejector roller to achieve increased rope tension during spooling and unspooling, but this is challenging due to inefficient force transmission from the ejector roller to the rope.
Innovation Solution
The use of at least three pressing elements distributed around the circumference of the ejector roller, including rotatable pinch rollers biased by spring elements, allows for improved force transmission and increased rope tension by optimizing the wrapping angle of the rope up to 90 degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a more powerful drive motor is used on the ejector roller to achieve increased rope tension, then the rope tension during spooling and unspooling is improved, but the device complexity and cost increase
Solution Approach 1:
The pressing device is segmented into multiple pressing elements (at least three) distributed around the circumference of the ejector roller. Each pressing element independently presses the rope against the roller surface, creating multiple friction contact points. This segmentation allows the system to achieve high rope tension through cumulative friction forces from multiple contact points rather than requiring a single high-power drive motor, thus resolving the contradiction between force output and device complexity.
2Force
If the rope is pressed against the ejector roller with high force to improve force transmission, then the rope tension is increased, but the friction losses and heat generation increase
Solution Approach 1:
By dividing the pressing action into multiple discrete pressing elements around the roller circumference, the total pressing force is distributed across multiple contact points. This reduces the localized friction stress at each point while maintaining cumulative force transmission efficiency, thereby reducing overall friction losses and heat generation compared to a single high-force contact point.
Solution Approach 2:
The pressing elements are arranged circumferentially around the ejector roller, utilizing the rotational dimension to create multiple contact points along the rope's path. This dimensional arrangement optimizes the wrapping angle and distributes the frictional force transmission across multiple locations, improving overall force transmission efficiency while reducing energy losses.
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 enables the use of a more powerful drive motor on the ejector roller, ensuring secure and correct spooling and unspooling of the rope with reduced operational effort and construction costs.
Implementation Method 1
the rope is pressed against the ejector roller by means of a pressing device... an improvement and increase of the wrapping of the cable on the ejector roller can be achieved... which makes it possible to transmit high forces from the ejector roller driven by means of the drive motor to the rope
Data Source
AI summary
This invention relates to a forestry winch that has a rope drum driven by a drive motor and an ejector roller driven by an additional drive motor, wherein a rope runs from the rope drum to the ejector roller and is guided over the ejector roller. The rope is pressed against the ejector roller by means of a pressing device. The pressing device has at least three pressing elements which are distributed around the periphery of the ejector roller.