Flywheel Housing Blow-By Gas Path Without Longer Crankcase
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Solution Overview
Problem
The existing configuration of crankcases with blow-by gas paths on the upper face poses challenges in efficiently discharging blow-by gases without enlarging the engine, as there is limited space on the upper face due to the cylinder head and intake manifold.
Innovation Solution
The engine design incorporates a flywheel housing with a blow-by gas path that allows the discharge of blow-by gases from the cylinder block, positioning the discharge port on the side of the cylinder block in the crankshaft direction, thereby avoiding the need to lengthen the crankcase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blow-by gas path outlet is provided on the upper face of the crankcase, then the blow-by gas can be discharged from the crankcase, but the engine size increases due to the need to lengthen the crankcase to avoid contact with the cylinder head and intake manifold
Solution Approach 1:
The patent relocates the blow-by gas path outlet from the upper face of the crankcase to the side face in the crankshaft direction. This dimensional change in the outlet position allows the gas pipe to be routed along the side of the crankcase, avoiding the need to lengthen the crankcase while still achieving effective blow-by gas discharge from the combustion chamber.
2Reliability
If the blow-by gas path outlet is provided on the upper face of the crankcase, then the blow-by gas can be discharged, but the device complexity increases due to the need for additional space and routing considerations
Solution Approach 1:
By moving the outlet to the side face of the crankcase, the gas pipe routing becomes more straightforward and utilizes the existing side space, reducing the overall routing complexity compared to navigating around the cylinder head and intake manifold on the upper face.
Data Source
AI summary
An engine includes: a cylinder block that has a cylinder included in a combustion chamber; a crankshaft that is placed in the cylinder block; a flywheel that is mounted to one end portion of the crankshaft; and a flywheel housing that is placed on a side of one end face of the cylinder block in a direction of the crankshaft and that houses the flywheel. The flywheel housing has a blow-by gas path through which a blow-by gas passes.