Lawn Mower Cutter Blade Posture Configuration for Vibration Reduction
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Solution Overview
Problem
Existing lawn maintenance machines with cutter units experience significant vibrations due to uneven ground contact by cutter blades, leading to reduced efficiency and user discomfort.
Innovation Solution
A lawn maintenance machine design where cutter blades are configured to maintain the same posture and ground contact on both sides of the center position, with each blade capable of being attached in three different postures, ensuring synchronized ground contact and reduced vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cutter blades are attached in different postures on left and right sides, then the cutter unit can adapt to uneven ground conditions, but vibrations of the cutter unit increase significantly
Solution Approach 1:
The patent applies asymmetry by allowing cutter blades on the left and right sides to have different postures (attachment angles) relative to the shaft. Specifically, cutter blades on one side can be attached at a different angle than those on the opposite side, enabling the cutter unit to adapt to uneven ground conditions. This asymmetric configuration allows the cutter to maintain contact with irregular terrain surfaces while reducing vibrations caused by synchronous ground contact of all blades.
2Object-affected harmful factors
If cutter blades are attached in the same posture on both sides, then vibrations are reduced, but the ability to adapt to uneven ground conditions decreases
Solution Approach 1:
The patent applies local quality by allowing different regions (left and right sides) of the cutter unit to have different blade postures according to local ground conditions. Each side can be optimized independently - for example, blades on one side may be attached at a higher angle to clear debris while blades on the other side maintain a lower angle for better ground contact. This localized optimization enables adaptation to uneven terrain while maintaining overall vibration reduction through controlled asymmetry.
Data Source
AI summary
The cutter unit of a lawn maintenance machine may include: a shaft; and an even number of cutter blades aligned in a left-right direction extending from the first portion away from a rotation axis. Each of the even number of cutter blades may be attached to the shaft in one of the at least three postures. A number of the cutter blades disposed to a right of a center position may be same as a number of the cutter blades disposed to a left of the center position. A disposition of the cutter blades in the right-left direction as viewed from the center position toward the right may be same as a disposition of the cutter blades in the right-left direction as viewed from the center position toward the left. The postures of two cutter blades being at a same distance from the center position may be same.