Rotating Brushcutter Cutting Head Assembly Mechanism
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Solution Overview
Problem
Existing cutting heads for motor lanes require additional components or tools for assembly and disassembly on a shaft end, complicating the process and increasing user burden.
Innovation Solution
The cutting head design features a rotatable upper base body part connected to the shaft end, allowing for assembly and disassembly without tools, with a screwing mechanism that secures the lower base body part to the shaft end, enabling axial securing of cutting tools and reducing the need for additional elements or tools to block the drive shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional cutting head design is used with additional components for locking the drive shaft, then the cutting head can be securely mounted, but the assembly and disassembly process becomes complex and requires additional tools
Solution Approach 1:
The invention extracts and eliminates the need for separate locking components and tools by integrating the locking function directly into the cutting head assembly. The user can lock the drive shaft by simply holding the upper base body part, removing the need for external locking mechanisms and specialized tools.
Solution Approach 2:
The invention merges the locking function with the base body structure itself. The upper base body part serves both as a structural component and as the locking element, combining multiple functions into a single integrated design that simplifies the overall system.
2Ease of operation
If additional components are used to lock the drive shaft during assembly and disassembly, then the drive shaft can be securely blocked, but the weight of the cutting head increases
Solution Approach 1:
The invention removes the need for separate locking components that would add weight. By using the base body parts themselves for locking, the design eliminates additional heavy elements while maintaining the locking capability.
Solution Approach 2:
The cutting head structure serves its own locking function without requiring external components. The upper and lower base body parts work together to lock the drive shaft, making the system self-sufficient and avoiding additional weight from separate locking mechanisms.
3Strength
If the contact surface between base body parts is positioned radially outward, then the structural strength is improved, but the bearing element cannot be properly retained axially
Solution Approach 1:
The invention applies different functional qualities to different regions of the base body structure. The outer edge of the upper base body part has increased axial height for retaining the bearing element, while the contact surface between base body parts maintains its structural positioning function. This localized differentiation of structural properties resolves the contradiction between strength and retention.
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 design simplifies the assembly and disassembly process, reduces the weight of the cutting head by eliminating the need for tools, and ensures secure attachment and detachment of the cutting head without additional components, enhancing operational efficiency and user convenience.
Implementation Method 1
The bearing element is provided and fixed to only one of the two base body parts, allowing the lower base body part of the cutting head, mounted on the shaft end, to rotate relative to the upper base body part
Implementation Method 2
During operation of the cutting tool, centrifugal forces act on the cutting tools when the base body rotates around the axis of rotation, causing the cutting tools to align radially outwards due to the centrifugal forces and to protrude beyond the circumference of the base body during operation of the cutting head
Data Source
Figure 1
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Figure 4
AI summary
The invention relates to a cutting head for mounting on a shaft end (2) of a brushcutter, comprising a split base body consisting of an upper base body part (11) and a lower base body part (12), and at least one cutting tool (13) arranged between the base body parts (11, 12). A screw element (37) for screwing the lower base body part (12) to the shaft end (2) is fixedly mounted in the lower base body part (12). During operation of the cutting head (10), the base body (90) is driven to rotate about a pivot axis (19). A bearing element (70) is fixed in the base body (90) and is located at a radial distance (m) from the pivot axis (19). A cutting tool (13, 73) is held on the bearing element (70).According to the invention, the upper base body part (11) is connected to the shaft end (2) in a rotationally fixed manner, and the bearing element (70) is fixed to only one base body part (12) and is free at least in the circumferential direction of the base body (90) relative to the other base body part (11), such that the lower base body part (12) mounted on the shaft end (2) is rotatable relative to the upper base body part (11).