Composite Mower Deck Resolving Strength-Weight Tradeoff
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Solution Overview
Problem
Current grass mowing machines for golf course roughs are heavy due to thick sheet steel decks, leading to increased fuel consumption, reduced vehicle speed, and strain on hydraulic and electrical systems when multiple decks are added, necessitating a lighter alternative without compromising durability.
Innovation Solution
A composite mower deck design featuring a one-piece outer plastic shell, a one-piece inner plastic skin, and metal webbing sandwiched between, with the metal webbing reinforced by steel rings and ribs, providing structural strength while minimizing weight and maintaining a smooth surface for grass clipping flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick sheet steel is used for rotary cutting decks to withstand rigorous mowing conditions, then strength and durability are improved, but weight increases leading to increased fuel consumption and reduced vehicle performance
Solution Approach 1:
The patent applies composite materials by combining plastic (polymer) with metal reinforcement elements (ribs and gussets) to create a hybrid structure that leverages the high strength-to-weight ratio of metals and the corrosion resistance and lightweight properties of plastics, resolving the contradiction between strength and weight
Solution Approach 2:
The patent applies local quality by strategically placing metal reinforcement ribs and gussets only in specific high-stress areas of the plastic deck rather than using uniform thick steel throughout, providing strength where needed while minimizing overall weight
2Productivity
If multiple rotary cutting decks are added to maximize productivity, then productivity is improved, but weight increases straining hydraulic and electrical systems
Solution Approach 1:
The composite plastic-metal construction enables multiple decks to be mounted on the vehicle without excessive weight accumulation, as each deck achieves sufficient strength with reduced material mass compared to traditional steel decks
Solution Approach 2:
The patent changes the material parameters from dense steel to lighter plastic with strategic metal reinforcement, fundamentally altering the weight characteristics while maintaining structural adequacy for multi-deck configurations
3Reliability
If plastic liners are used to protect mower decks and direct grass clippings, then protection and flow guidance are improved, but weight reduction for multiple decks has not been achieved
Solution Approach 1:
The patent evolves from adding plastic liners to steel decks to creating an integrated plastic-metal composite deck where the plastic forms the primary structural body with embedded metal reinforcement, achieving both protection and significant weight reduction
Solution Approach 2:
The patent merges the protective liner function with the primary deck structure by making the plastic shell load-bearing with metal reinforcement, rather than treating them as separate components, achieving weight reduction while maintaining protection
Data Source
AI summary
A composite mower deck includes a metal webbing sandwiched between an outer plastic shell and an inner plastic skin. The inner plastic skin has a substantially smooth undersurface for flow of grass clippings. The metal webbing may include an inner ring for supporting a motor hub.