Mowing Unit Flow-Guided Cavity for Self-Cleaning Bearing Points

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Solution Overview

Problem

Existing mowing units for lawnmowers and brushcutters require significant cleaning and maintenance efforts due to the accumulation of clippings on bearing points and tool assemblies, which is inefficient and time-consuming.

Innovation Solution

A mowing unit design featuring a tool carrier with a cavity and flow guide that allows ambient fluid to flow through, automatically cleaning the bearing points and tool assemblies by reducing the adhesion of clippings during operation, utilizing a tool carrier that rotates around a drive axis with a support base and flow guide forming a cavity, and a bearing point for tool assemblies that are partially or completely within the cavity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional mowing units are used, then the structure is simple, but the cleaning and maintenance effort is high

Engineering Contradiction:

Improvecleaning and maintenance effortVSAvoidstructure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The mowing unit is designed to clean itself during operation. The flow guide device directs ambient fluid through the cavity, which automatically cleans the bearing point and tool assembly without requiring manual intervention. This self-cleaning mechanism eliminates the need for separate cleaning operations while maintaining structural simplicity.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Ambient fluid acts as an intermediary cleaning medium. The flow guide device channels this fluid through the cavity to reach the bearing point and tool assembly, providing a simple yet effective cleaning mechanism that avoids complex mechanical cleaning systems.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Extent of automation

If manual cleaning is performed, then the maintenance effort is high, but the automation level is low

Engineering Contradiction:

Improveautomatic cleaning capabilityVSAvoidmaintenance time

Core Design Contradiction:

Extent of automationVSLoss of time

Solution Approach 1:

The system performs automatic cleaning during its operational cycle. The flow guide device ensures ambient fluid continuously passes through the cavity, cleaning the bearing point and tool assembly without requiring separate manual cleaning operations, thus eliminating maintenance time loss.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The cleaning action occurs continuously during the mowing operation. As the tool carrier rotates and ambient fluid flows through the cavity, the bearing point and tool assembly are constantly cleaned, ensuring no accumulation of clippings without interrupting the mowing task.

Inventive Principle:

Principle #20Continuity of useful action

3Productivity

If clippings accumulate on bearing points, then the operational efficiency decreases, but the cleaning frequency increases

Engineering Contradiction:

Improveoperational efficiencyVSAvoidcleaning frequency

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The bearing point and tool assembly automatically clean themselves during operation, preventing clipping accumulation that would reduce operational efficiency. This eliminates the need for frequent cleaning interruptions, maintaining continuous high productivity.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The ambient fluid, which would normally just pass by the bearing point, is redirected through the cavity by the flow guide device to become an effective cleaning medium. This converts a potentially harmful accumulation problem into a beneficial self-cleaning mechanism that maintains operational efficiency.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

Reduces the need for manual cleaning and maintenance by using ambient fluid to self-clean the bearing points and tool assemblies, thereby minimizing manual effort and maintaining operational efficiency.

Implementation Method 1

when the tool carrier rotates around the drive axis, a portion of the surrounding fluid flows through the cavity

Methodology Applied

Scientific EffectFluid flow:

Implementation Method 2

unwanted adhesion of clippings to the bearing point and/or the tool assembly mounted therein can be reduced or even completely avoided

Methodology Applied

Scientific EffectAdhesion reduction:

Data Source

PatentEP4659560A1Mowing device and lawnmower and/or free cutter

Publication Date: 2025.12.10 ANDREAS STIHL AG & CO KG

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AI summary

The invention relates to a mowing unit (1) for a lawnmower (50) and/or for a brushcutter (60), wherein the mowing unit (1) comprises: a tool carrier (2) designed for rotation about a drive axis (3) of the mowing unit (1) and comprising a support base (4) and a flow guide device (5) opposite the support base (4) in an axial direction (A) of the drive axis (3), wherein the support base (4) and the flow guide device (5) together form at least one cavity (6) of the tool carrier (2), wherein, when the tool carrier (2) rotates about the drive axis (3), a portion of an ambient fluid (F) surrounding the tool carrier (2) flows through the cavity (6), and at least one bearing point (B) designed for supporting a tool assembly (7) and arranged at least partially within the cavity (6).