Disc Mower Head Dual-Layer Peripheral Wall Design
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Solution Overview
Problem
Disc mowing heads face a design conflict where the peripheral wall must be both stable to prevent stone chips from escaping and flexible to allow grass to enter the cutting area without being flattened, with existing solutions failing to adequately balance these requirements.
Innovation Solution
A disc mower head design featuring a hood-like housing with two separate radial wall layers, where the outer layer is more flexible to allow grass to bend inward and the inner layer is stiffer to prevent stone chips from escaping, with the flexible layer protruding downwards to direct debris away from the cutting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the peripheral wall is made rigid and stable radially outwards to hold stones, then stone chip protection is improved, but the wall becomes too stiff to allow grass to pass under without being flattened
Solution Approach 1:
The peripheral wall is divided into two separate wall layers: an inner wall layer that is rigid for stone chip protection, and an outer wall layer that is flexible to allow grass passage. This segmentation allows each layer to fulfill its specific function independently, resolving the contradiction between rigidity and flexibility.
Solution Approach 2:
Different parts of the peripheral wall structure are given different mechanical properties. The inner wall layer is designed with high rigidity for stone containment, while the outer wall layer is designed with flexibility for grass passage. This local differentiation of material properties allows the structure to simultaneously satisfy both contradictory requirements.
2Ease of operation
If the peripheral wall is made flexible radially inwards to allow grass passage, then grass cutting is improved, but the wall becomes insufficient to hold stones thrown forward
Solution Approach 1:
The peripheral wall is segmented into two functional layers: the inner wall layer provides rigid stone chip protection, while the outer wall layer provides flexible grass passage. This segmentation ensures that flexibility in one part does not compromise the rigidity needed for stone containment in another part.
Solution Approach 2:
The peripheral wall uses a composite structure with two different wall layers having different mechanical properties. The inner layer uses rigid material for stone protection, while the outer layer uses flexible material for grass passage, creating a composite system that combines the benefits of both material types.
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
To provide protection against stone impacts, the circumferential wall (2b1) of the disc mower head (50) – which rotates around the center during operation due to rolling against an obstacle – consists of two layers in the radial direction (11): a light, flexible, downwardly projecting first wall layer (17), e.g., the impact cloth (17), and a stiffer second wall layer (18), e.g., a skirt made of heavier plates 18 or vertical tongues 18, providing wear protection for the impact cloth (17). The wall layers (17, 18) are attached to the upper housing part (2a) by means of a circumferential flexible edge element (15), which allows for easy detachment and clamping.