Belt-Driven Working Head Layout Without a Tensioner
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Solution Overview
Problem
Existing working machines require a tensioner to adjust the belt tension due to the changing position of the second shaft relative to the first shaft, which complicates the mechanism and increases maintenance needs.
Innovation Solution
The configuration supports both the first and second shafts by a common member, stabilizing the relative position of the second shaft to the first shaft, thereby eliminating the need for a tensioner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the second shaft is supported by a different member (second member) than the first shaft, then the transmission mechanism can be more flexible in layout, but the position of the second shaft relative to the first shaft changes, requiring a tensioner to adjust belt tension
Solution Approach 1:
The patent merges the support function for both the first shaft and second shaft into a single common member (first member). This consolidation eliminates the need for a separate second member and the associated tensioner mechanism, thereby reducing device complexity while maintaining layout flexibility through the unified support structure.
2Adaptability or versatility
If the second shaft is supported by a different member, then layout flexibility is improved, but a tensioner is required to maintain suitable belt tension, increasing device complexity and maintenance needs
Solution Approach 1:
By combining the support of both shafts onto the first member, the patent eliminates the tensioner component that would require periodic adjustment and maintenance. This unified support approach reduces the number of moving parts and maintenance points, thereby improving reliability while preserving layout flexibility.
3Device complexity
If both shafts are supported by the same member, then the relative position between shafts is stabilized and tensioner can be omitted, but the layout flexibility may be reduced
Solution Approach 1:
The first member is designed as a universal support structure that performs multiple functions: it supports both the first shaft and second shaft, maintains their relative positions, and provides mounting points for other transmission components. This multi-functional design achieves mechanism simplicity while preserving layout flexibility through its versatile support capabilities.
Data Source
AI summary
The working machine may include an operation rod, a rear unit and a front unit. The front unit may include a front housing, a first member, a first shaft that is rotatable and supported by the first member via a first bearing, a working member configured to work by rotation of the first shaft, and a transmission unit configured to rotate the first shaft when the prime mover operates. The transmission unit may include a second shaft supported by the first member via a second bearing, a first pulley fixed to the first shaft and configured to rotate about a first pulley rotation axis, a second pulley fixed to the second shaft and configured to rotate about a second pulley rotation axis substantially parallel to the first pulley rotation axis, and a belt connecting the first pulley and the second pulley.