Integrated Air Nozzle and Conductor for Engine Intake Cleaning
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Solution Overview
Problem
Existing motor-driven tools, such as chain saws and hedge trimmers, face challenges with air filter maintenance due to dusty environments, as traditional air filtration systems are costly, prone to clogging, and can leak air, leading to ineffective cleaning of intake air.
Innovation Solution
The air nozzle and air conductor are manufactured as a single piece, ensuring an airtight seal and easy assembly onto the crankcase, with a protrusion on the crankcase guiding air flow to filter out particles effectively without the need for screws, and using injection molding for cost-effective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional air filters are used for cleaning intake air, then particle filtration is achieved, but the air filter clogs quickly and requires frequent maintenance
Solution Approach 1:
The patent applies preliminary action by introducing a centrifugal cleaning system (fan wheel) that removes large particles from intake air before the air reaches the air filter. This pre-cleaning action prevents the filter from clogging quickly, thereby maintaining filter performance over longer periods and reducing maintenance frequency.
2Ease of manufacture
If separate air nozzle and air conductor components are used, then assembly flexibility is maintained, but manufacturing cost and assembly complexity increase
Solution Approach 1:
The patent merges the air nozzle and air conductor into a single integrated component manufactured as one piece. This consolidation reduces the total number of parts, simplifies assembly procedures, and lowers manufacturing costs while maintaining the functional performance of both components.
3Reliability
If air nozzle and air conductor are assembled separately, then ease of replacement is improved, but airtightness may be compromised due to potential gaps
Solution Approach 1:
By manufacturing the air nozzle and air conductor as a single integrated piece, the patent eliminates potential gaps and sealing issues that arise from assembling separate components. The unified structure ensures inherent airtightness without requiring additional sealing elements or complex assembly procedures.
4Reliability
If fan wheel centrifugal cleaning is implemented, then particle removal efficiency is improved, but device complexity and production cost increase
Solution Approach 1:
The patent integrates the fan wheel into the existing air intake system of the motor-driven tool, where it serves dual functions: generating airflow for cooling and simultaneously acting as a centrifugal separator for particle removal. This multi-functionality approach avoids adding a separate dedicated cleaning system, thereby limiting the increase in device complexity.
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 solution reduces maintenance needs for air filters by effectively cleaning intake air, minimizing air leakage, and streamlining the manufacturing and assembly process while maintaining a high level of particle filtration efficiency.
Implementation Method 1
particles are thrown against the periphery of the fan housing due to the centrigual force
Data Source
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AI summary
The invention deals with an arrangement for cleaning of intake air for an air-cooled internal combustion engine of a motor-driven tool, such as a chain saw. The arrangement comprises: an air conductor (10) surrounding a fan wheel (40) arranged to propel inlet air around an axis of the fan wheel, an inner wall (11) of the air conductor being arranged for guiding air propelled by the fan wheel; and an air nozzle (20) for cleaning of inlet air, arranged on the inner wall (11) of the air conductor (10) radially close to said fan wheel, the air nozzle (20) serving as a passage way for providing cleaned inlet air from the fan wheel to the engine of the motor-driven tool, wherein the air nozzle (20) and the air conductor (10) are manufactured in one piece. By manufacturing the air nozzle (20) and the air conductor (10) in one piece, a reliable cleaning of intake air is achieved, at the same time as the manufacturing and assembling process will be cost- effective and reliable.