Angled Cutter Shaft Lawnmower Deck for Energy Reduction
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Solution Overview
Problem
Existing lawnmowers face challenges with operational time, energy efficiency, and uniformity of cutting, particularly for electrically powered models and those with combustion engines.
Innovation Solution
A lawnmower cutting deck with at least a first cutter shaft rotating around a parallel axis to the ground surface, angled cutting units that rotate in planes angled relative to the forward direction, and multiple cutter shafts arranged to cover a wide area, enhancing cutting efficiency and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the size and/or number of batteries are increased to prolong operational time, then available operational time is improved, but weight and costs increase
Solution Approach 1:
The patent changes the operational parameters by introducing multiple cutter shafts with angled cutting units that reduce energy consumption during cutting operations. This allows the lawnmower to achieve extended operational time without increasing battery capacity, thereby avoiding additional weight
2Duration of action of moving object
If the size and/or number of batteries are increased to prolong operational time, then available operational time is improved, but costs increase
Solution Approach 1:
The patent modifies the cutting mechanism parameters by using multiple cutter shafts with angled cutting units positioned at specific angles (10-60 degrees) relative to the forward direction. This parameter change optimizes cutting efficiency and reduces energy consumption, extending operational time without the need for additional batteries or increased system complexity
3Device complexity
If a traditional horizontal cutting device is used, then the structure is simple, but energy consumption is high and cutting uniformity is poor
Solution Approach 1:
The patent transitions from a traditional horizontal cutting plane to an angled cutting plane. The cutting units are arranged on cutter shafts that are inclined at angles between 10-60 degrees relative to the forward direction of movement. This dimensional change in the cutting plane orientation improves cutting uniformity and reduces energy consumption while maintaining reasonable structural complexity
4Device complexity
If a traditional horizontal cutting device is used, then the structure is simple, but cutting uniformity is poor
Solution Approach 1:
The patent introduces angled cutter shafts with cutting units positioned at inclinations of 10-60 degrees relative to the forward direction. This angular orientation creates multiple cutting zones that work in sequence, improving the uniformity of grass length across the cutting width while maintaining a structurally feasible design
Data Source
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AI summary
A lawnmower cutting deck (1) is disclosed, wherein the cutting deck (1) is configured to be moved in a forward direction (d1) over a ground surface (5) to cut grass. The cutting deck (1) comprises at least a first cutter shaft (7.1) and at least one cutting unit (9) arranged on the first cutter shaft (7.1). The first cutter shaft (7.1) is configured to rotate around a first rotational axis (ax1) extending substantially parallel to the ground surface (5) to rotate the at least one cutting unit (9) in a first rotational plane (p1). The first rotational plane (p1) is angled in relation to the forward direction (d1). The present disclosure further relates to a lawnmower (3, 3') comprising a lawnmower cutting deck (1) and a method (100) of mowing a lawn.