Saw Chain Link Offset Footprint Design
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Solution Overview
Problem
Existing saw chains face challenges in minimizing kerf width without causing knife edging on bar rails, maintaining sufficient kerf to bar clearance, and ensuring chain strength, which affects cutting efficiency and power consumption.
Innovation Solution
The saw chain design features rail engaging links with offset footprints that distribute contact evenly across the rail, preventing knife edging and allowing for thinner chain components without compromising bar width or cutter offset, while incorporating an offset feature to facilitate lubricant distribution and drive sprocket penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If thinner chain components are used to narrow the kerf, then power consumption is reduced, but knife edging occurs on the bar rails and links
Solution Approach 1:
The rail engaging link is segmented into multiple foot portions (leading foot portion and trailing foot portion) that contact the bar rail at different locations. This segmentation allows the contact load to be distributed across multiple points rather than concentrated at a single point, preventing knife edging even when using thinner chain components.
Solution Approach 2:
The invention introduces an offset dimension to the footprint of the rail engaging link, creating a leading foot portion and a trailing foot portion that are offset from each other in the direction of travel. This dimensional change allows the link to engage the bar rail in a way that distributes contact evenly across the rail width without requiring increased component thickness.
2Use of energy by moving object
If the kerf is narrowed to minimize power consumption, then cutting efficiency improves, but the kerf to bar clearance becomes unacceptable
Solution Approach 1:
The rail engaging link has different foot portions with different contact characteristics. The leading and trailing foot portions are positioned to contact specific regions of the bar rail, creating localized contact zones that maintain adequate clearance while allowing the kerf to be narrower overall.
3Ease of operation
If the bar width is narrowed to maintain kerf to bar clearance, then chain strength is reduced, but cutting performance is affected
Solution Approach 1:
By segmenting the rail engaging link into multiple foot portions, the invention allows the bar to maintain its full width and strength while still achieving adequate kerf to bar clearance through the distributed contact pattern of the segmented link.
4Use of energy by moving object
If the cutter offset is reduced to narrow the kerf, then power consumption decreases, but chip flow up the side of the bar is negatively affected
Solution Approach 1:
The rail engaging link exhibits asymmetric contact with the bar rail through its offset footprint design, with leading and trailing foot portions positioned at different locations. This asymmetric configuration maintains adequate cutter offset for proper chip flow while allowing the kerf to be narrower, resolving the contradiction between power consumption and chip flow performance.
Data Source
Figure 1~2
Figure 3A~3F
Figure 3G~3J
AI summary
In various embodiments, a saw chain is provided that includes a rail engaging link that has an offset footprint within the link itself and/or with respect to other links in the chain that are adapted to ride on the same rail. Saw chains as provided may be used in a variety of applications, including but not limited to wood cutting and aggregate cutting applications.