Outer Rotor Motor Integration in Mowing Cylinder Cutters

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Solution Overview

Problem

Current lawn care devices, such as cylinder mowers, have complex transmission structures that lead to efficiency losses and noise, limiting their effectiveness and compactness.

Innovation Solution

A mowing cylinder cutter and lawn care tool driven by a built-in outer rotor motor, where the outer rotor motor is integrated within the device, simplifying the transmission structure and directly driving the blades, resulting in a compact and efficient design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If chain drive is used to drive the cylinder cutter, then the transmission function is achieved, but the structure becomes complicated and efficiency is reduced

Engineering Contradiction:

Improvework efficiencyVSAvoidtransmission structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The motor is integrated directly into the cylinder cutter assembly, merging the power source and the cutting mechanism into a single unified structure. This eliminates the need for separate transmission components like chains, thereby simplifying the overall structure while maintaining driving functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent replaces the mechanical chain drive system with a direct motor-driven system. The motor's rotor is directly connected to the cylinder cutter, substituting the intermediate mechanical transmission components with an electromechanical direct-drive approach, which reduces structural complexity and improves efficiency.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Volume of moving object

If traditional motor placement on the side of the frame is used, then the device structure is simple, but the overall structure becomes bulky and less compact

Engineering Contradiction:

Improveoverall structure compactnessVSAvoidmotor integration complexity

Core Design Contradiction:

Volume of moving objectVSDevice complexity

Solution Approach 1:

The motor is nested within the cylinder cutter assembly, with the motor housing integrated into the cutter structure. The rotor is positioned inside the stator assembly, and the cutting blades are arranged around the motor components, creating a nested configuration that maximizes space utilization and achieves a compact overall structure.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The motor is positioned in a different spatial arrangement compared to traditional side-mounted configurations. By integrating the motor axially within the cutter assembly rather than mounting it laterally on the frame, the design achieves compactness in the horizontal dimension while maintaining vertical clearance.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Loss of energy

If complex transmission structure is used, then power transmission is achieved, but noise increases and efficiency decreases

Engineering Contradiction:

Improveenergy lossVSAvoidtransmission structure

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent eliminates mechanical transmission components (chains, gears, belts) and replaces them with a direct electromechanical connection. The motor's rotational force is transmitted directly to the cylinder cutter through the rotor-stator assembly, removing intermediate transmission stages that cause energy loss and noise.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts and removes the complex transmission structure from the system, retaining only the essential direct-drive connection between the motor and cutter. By taking out the unnecessary intermediate components, the design achieves lower energy loss and reduced noise while maintaining the core power transmission function.

Inventive Principle:

Principle #2Taking out (Extraction)

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

This design enhances work efficiency, reduces noise, and improves torque, enabling effective operation in complex environments while maintaining a compact structure.

Implementation Method 1

the outer rotor motor includes a stator assembly and an outer rotor; the stator assembly is connected to a frame through a connecting member, and the outer rotor is connected to the reel

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS12256666B2Mowing cylinder cutter and lawn care tool driven by built-in outer rotor motor

Publication Date: 2025.03.25 GREENMAN MACHINERY

AI summary

A mowing cylinder cutter and a lawn care tool driven by a built-in outer rotor motor are provided. The cylinder cutter includes an outer rotor motor, blades and a reel. The blades are fixedly connected to the reel through support plates. At least one end of the reel is provided with the outer rotor motor. The outer rotor motor includes a stator assembly and an outer rotor. The stator assembly is connected to a frame through a connecting member, and the outer rotor is fixedly connected to the reel. The lawn care tool includes a working part, a main shaft, a motor shaft and an outer rotor motor. The motor shaft passes through the main shaft. One end of the main shaft is connected to the motor shaft through a bearing assembly. The outer rotor motor is located in the main shaft.