Saw Chain Drive Wheel Nesting to Reduce Chain Oscillation
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Solution Overview
Problem
Chainsaws with drive wheels for saw chains experience oscillation perpendicular to the running direction during startup and cutting, leading to elongation and reduced working life due to forward and backward movements of the saw chain.
Innovation Solution
A cutting device with a drive wheel featuring driving link mounts and connecting link mounts designed as projections, which engage with the saw chain to transmit force and prevent or reduce oscillation by forming a 'nest' for the saw chain, ensuring it moves only in the intended direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only the driving link is driven by the drive wheel, then the structure is simple, but the saw chain oscillates perpendicular to the running direction and elongates
Solution Approach 1:
The drive wheel is segmented into two distinct types of link mounts: driving link mounts for engaging driving links, and connecting link mounts (projections) for engaging connecting links. This segmentation allows independent optimization of each mount type to address specific functional requirements while preventing chain oscillation.
Solution Approach 2:
The connecting link mounts (projections) are integrated into the drive wheel structure, forming a nested arrangement where the projections extend into the spaces between connecting links. This creates a compact configuration that prevents perpendicular oscillation without adding external components.
2Power
If the drive wheel engages only driving links, then force transmission is direct, but forward and backward movements of the saw chain occur
Solution Approach 1:
The drive wheel merges two previously separate functions into a single integrated structure: driving link engagement and connecting link engagement. Both types of link mounts are provided on the same drive wheel, working simultaneously to transmit force while preventing oscillation through the combined action of both mount types.
Solution Approach 2:
The connecting link mounts (projections) act as intermediaries between the drive wheel and the connecting links. These projections engage with the connecting links to provide lateral support and prevent perpendicular movement, while still allowing the driving link mounts to transmit forward motion forces effectively.
3Device complexity
If the saw chain is allowed to oscillate, then the drive wheel structure is simpler, but the cutting process becomes less smooth
Solution Approach 1:
Different regions of the drive wheel are given different functional qualities: the driving link mounts are optimized for force transmission in the forward direction, while the connecting link mounts (projections) are optimized for preventing lateral oscillation. This local differentiation of functional qualities achieves smooth cutting without requiring complete structural redesign.
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 effectively prevents or reduces forward and backward movements of the saw chain, enhancing its working life and smoothing the cutting process by ensuring consistent force transmission and reduced load on connecting means.
Implementation Method 1
the link mounts of the first type are arranged to transmit force from the drive wheel to the respective connecting links
Implementation Method 2
a part of the respective driving link is in engagement with the respective driving link mount, so that force can be transmitted from the drive wheel to the driving links
Implementation Method 3
A nest for the saw chain, in particular for the driving links and connecting links, may be formed on the drive wheel by the link mounts of the first type designed as projections, whereby the saw chain may be fixable and/or retainable during force transmission
Data Source
AI summary
The invention relates to a cutting device (12) and a related drive wheel (11), wherein the cutting device (12) comprises a saw chain (13) and a drive wheel (11), wherein the tie straps (17) are arranged alongside the drive links (16), wherein the tie straps (17) are connected to the drive links (16) by connecting means (18), wherein cutting devices (12) for cutting an item or material are provided on the drive links (16) and/or tie straps (17), wherein the drive wheel (11) has a plurality of drive-link receptacles (6), wherein part of the respective drive links (16) is in engagement with the respective drive-link receptacle (6), wherein the drive wheel (11) has a plurality of link receptacles of a first type (2), wherein the link receptacles of the first type (2) are in the form of elevations, wherein the link receptacles of the first type (2) are in engagement with the respective tie straps (17), and wherein the link receptacles of the first type (2) are designed to transmit force from the drive wheel (11) to the respective tie straps (17).