Crank Case Recess Air Cushion for Thermal Separation
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Solution Overview
Problem
Internal combustion engine equipment, such as chain saws and cutoff saws, face issues with soiling of cooling ribs due to dust deposition, leading to reduced cooling efficiency and air filter blockage, and compact design constraints that expose fuel tanks to undesirable heat radiation.
Innovation Solution
A device with a recess in the crank case forms an air cushion for thermal separation between the tank and crank case, using the extracted air from a cyclone separator to create an air channel that cools the crank case and reduces heat radiation, allowing for a compact design while maintaining effective air cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the tank is arranged close to the internal combustion engine for compact design, then the device size is reduced, but the tank is exposed to undesirable heat radiation
Solution Approach 1:
An air channel is introduced as an intermediary substance between the crank case and the tank. This air channel acts as a thermal mediator that absorbs heat radiation from the crank case and transports it away, protecting the tank from excessive heat exposure while allowing compact arrangement.
Solution Approach 2:
The invention uses pneumatic principles by creating a forced air flow through the air channel using a cyclone separator and extraction impeller. The extracted air is conveyed through the air channel in a controlled manner to provide thermal separation, utilizing fluid dynamics to solve the heat exposure problem.
2Temperature
If a separate air channel is created for thermal separation, then the tank is protected from heat, but the device complexity increases
Solution Approach 1:
The air channel serves multiple functions simultaneously: it provides thermal separation between the crank case and tank, acts as an installation channel for cylinder barrel bolts, and serves as a pathway for extracted air from the cyclone separator. By merging these functions into a single structural element, the invention avoids increasing device complexity while achieving heat protection.
Solution Approach 2:
The air channel is designed as a multi-functional component that combines thermal protection, mechanical access (for bolts), and fluid transport (for extracted air). This universal design approach allows a single structure to fulfill multiple roles, preventing complexity increase despite the added thermal separation function.
3Reliability
If the air filter is used to clean intake air, then combustion air is filtered, but the air filter quickly becomes blocked with dust
Solution Approach 1:
The cyclone separator performs preliminary cleaning of the intake air before it reaches the air filter. By removing a significant portion of dust particles upstream through centrifugal separation, the air filter is protected from rapid clogging, extending its service life while maintaining reliable combustion air quality.
4Reliability
If a cyclone separator is used to clean intake air, then dust particles are separated, but the device complexity increases
Solution Approach 1:
The cyclone separator is integrated with the existing air intake system and the extraction impeller, merging air cleaning functionality with the cooling air extraction system. This integration allows the cyclone separator to be added without proportionally increasing overall device complexity, as it shares components and space with existing systems.
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
The solution effectively cleans intake air, reduces heat exposure for the fuel tank, and enables a compact design by using the extracted air for both cooling and preheating, improving engine operation at low temperatures and maintaining efficient cooling and ignition.
Implementation Method 1
cyclone separators or cyclones, which separate dirt particles from the intake air by means of the centrifugal effect
Implementation Method 2
an air cooling stream is present for cooling the internal combustion engine
Implementation Method 3
the heat generated by the combustion in the engine is used in order to preheat air in this channel
Data Source
AI summary
A device is provided for a piece of equipment with an internal combustion engine having a crank case and a combustion space, wherein an air cooling stream is present for cooling the internal combustion engine. The device, on the one hand, is effective for cleaning of the intake air, and on the other hand, a thermal separation between tank and crank case is achieved in a simple manner. The device includes at least one recess, which is constructed open or closed, and is arranged in the crank case, and is separated from an interior of the crank case and forms air cushions.