Mower Blade Device with Integral Segmented Elements
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Solution Overview
Problem
Existing mowing blade devices face issues with high mass and wear due to direct force application on blades, leading to frequent breakages, complex maintenance, and short service life, as well as difficulties in grinding and sharpening due to riveted or welded construction.
Innovation Solution
A double-knife cutting system with integral, one-piece blade elements and an exchangeable blade head, featuring an elastic section and preloaded tension spring to reduce wear and facilitate maintenance, along with a design that eliminates thickened material edges for improved sliding and accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If driving forces act directly on the blade with riveted or welded construction, then the blade can be securely attached, but the mass increases and wear accelerates due to constant pressure and tension alternation
Solution Approach 1:
The blade is divided into multiple individual blade elements that are not permanently fixed to each other. Each blade element can move independently along the blade rod, allowing the system to distribute mechanical stresses across multiple contact points rather than concentrating them at rivet or weld joints. This segmentation reduces the mass required for each individual element while maintaining overall structural strength.
Solution Approach 2:
The blade elements are designed to be movable rather than fixed, allowing them to dynamically adjust their positions in response to varying operational loads. This dynamic capability enables the blade system to absorb pressure and tension alternation through controlled movement of elements along the rod, reducing wear on individual components and eliminating the need for heavy riveted or welded constructions.
2Strength
If blade elements are riveted or welded together, then the blade structure is strengthened, but grinding and sharpening becomes difficult due to thickened material edges
Solution Approach 1:
By segmenting the blade into separate movable elements rather than permanently joining them through rivets or welds, the design eliminates thickened material edges at connection points. Each blade element maintains a uniform cross-section along its length, providing consistent access for grinding and sharpening tools across the entire blade assembly while preserving structural integrity through the movable connection system.
3Ease of manufacture
If the blade is designed as a single integral piece, then manufacturing is simplified, but replacement and maintenance become time-consuming and expensive
Solution Approach 1:
The blade system is segmented into individual blade elements that can be independently removed and replaced. This allows maintenance personnel to replace only the worn or damaged elements rather than the entire blade assembly, significantly reducing replacement time and costs. The standardized movable connection system enables quick interchange of blade elements while maintaining the simplicity of integral blade manufacturing for each individual element.
4Reliability
If larger dimensions are used for blade parts to prevent breakage, then reliability improves, but service life decreases due to increased wear from excessive mass
Solution Approach 1:
The movable blade elements can dynamically respond to overload conditions by shifting positions along the blade rod, distributing stress more evenly across the system. This dynamic adaptation allows the use of smaller, lighter blade elements that would otherwise be prone to breakage, as the system collectively absorbs and distributes impact forces. The reduced mass of individual elements directly translates to decreased wear and extended service life while maintaining reliability.
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 reduces wear, increases service life, simplifies maintenance and replacement, and lowers costs by allowing easier access for grinding and sharpening, while maintaining efficient cutting performance.
Implementation Method 1
the cutter head has an elastic section which is formed between a connecting section of the cutter head with the blade back and a connection for the drive
Implementation Method 2
the elastic section is designed to dampen a movement in a plane which is parallel to the plane defined by the blade elements
Implementation Method 3
The contact pressure of the upper cutting blade on the lower cutting blade is reduced, in particular by means of a preloaded tension spring
Data Source
AI summary
The invention relates to a mower blade device (100) with a double-blade cutting system (111), wherein the double-blade cutting system (111) comprises an upper cutting blade (140) and a lower cutting blade (180), which are designed to be movable relative to each other by means of a one-sided drive (114), wherein at least the upper cutting blade (140) or the lower cutting blade (180) each comprises several blade elements (145) which are connected to each other via a blade back (144, 184), and wherein the blade elements (145) and the blade back (144, 184) are designed as a common integral component, and wherein the mower blade device (100) has an interchangeable blade head (200) for initiating a drive movement of a lateral drive (144) onto the double-blade cutting system (111).