Snowmobile Air Intake Layout for Turbo Engine Cooling and Vibration
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Solution Overview
Problem
Conventional snowmobiles with two-stroke engines have high power-to-weight ratio but low fuel efficiency, high noise levels, and produce undesirable pollution, while four-stroke engines, although more efficient, are typically larger and heavier. Integrating a turbocharger to enhance four-stroke engine power without increasing size poses cooling and vibration challenges.
Innovation Solution
A cooling system for turbocharged four-stroke engines in snowmobiles, featuring a coolant distribution assembly with thermostat chambers and a vapor tank, and an air cooling system with an intercooler to manage heat and vibrations, along with an exhaust system using vibration isolators to stabilize the turbocharger and muffler.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a turbocharger is added to a four-stroke engine to increase power, then power output is improved, but cooling system complexity and vibration increase
Solution Approach 1:
The patent combines the engine cooling system and turbocharger cooling system into a single integrated cooling circuit. The coolant distribution assembly includes a thermostat chamber that selectively directs coolant to either the engine or turbocharger based on thermal needs, merging two separate cooling systems into one unified system that manages both components efficiently.
Solution Approach 2:
The cooling system is designed with multi-functionality to handle both engine cooling and turbocharger cooling through a single circuit. The pump, coolant distribution assembly, and thermostat chamber work together to provide universal cooling coverage for multiple heat-generating components (engine and turbocharger) rather than requiring separate dedicated cooling systems.
2Power
If a turbocharger is added to a four-stroke engine to increase power, then power output is improved, but vibration increases
Solution Approach 1:
The patent introduces vibration isolators as intermediary elements between the turbocharger/muffler assembly and the snowmobile frame. These isolators act as mediators that absorb and dampen vibrations generated by the turbocharger and exhaust system, preventing direct transmission of vibrations to the frame while allowing the turbocharger to function at full power.
3Use of energy by moving object
If a four-stroke engine is used instead of a two-stroke engine, then fuel efficiency is improved, but engine size and weight increase
Solution Approach 1:
The patent employs parameter changes by implementing forced induction through a turbocharger on the four-stroke engine. This allows the engine to operate at higher compression ratios and intake pressures, increasing power density and enabling a smaller displacement engine to produce the same power output as a larger naturally aspirated engine, thereby reducing overall engine size and weight while maintaining fuel efficiency advantages.
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
Enhances fuel efficiency, reduces noise and emissions, and maintains a compact size by effectively cooling and stabilizing the turbocharged four-stroke engine, improving the riding experience.
Implementation Method 1
The air channel has a lower wall and a pair of oppositely disposed side walls that direct ambient ram air into the intercooler such that heat transfers from the compressed air to the ambient ram air in the intercooler, thereby cooling the compressed air and increasing the density of the compressed air before the compressed air enters the engine
Implementation Method 2
An exhaust system for a snowmobile having a turbocharger and a muffler. A plurality of mounting assemblies couples the turbocharger and the muffler to a frame of the snowmobile. The plurality of mounting assemblies includes a first mounting assembly and a second mounting assembly. The first mounting assembly includes a first turbocharger bracket, a first frame bracket and a first vibration isolator interposed between the first turbocharger bracket and the first frame bracket. The second mounting assembly includes a second muffler bracket, a second frame bracket and a second vibration isolator interposed between the second muffler bracket and the second frame bracket. The first and second vibration isolators reduce vibrations from the turbocharger and the muffler.
Data Source
AI summary
An air intake system for a snowmobile having a forward frame assembly. The air intake system includes an airbox having an inlet configured to receive ambient air and an outlet. The airbox is coupled to a forward side of the forward frame assembly. An air filter assembly is in downstream fluid communication with the airbox. The air filter assembly has an inlet that is coupled to the outlet of the airbox. The inlet of the air filter assembly is at least partially aligned with the inlet of the airbox.