Engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorYui Saito
Life of this patent
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Abstract
An engine performs ventilation of blow-by gas by introducing air from an intake passage into a crankcase. The engine includes an air introduction passage that fluidly connects the intake passage to the crankcase, a unidirectional valve attached to the crankcase and configured to restrict a flow of gas from the crankcase toward the intake passage through the air introduction passage, and a coupling passage that guides, into the crankcase, air discharged from the unidirectional valve. The coupling passage extends in the direction that is different from a direction in which air is discharged from the unidirectional valve.
Claims4
An engine configured to perform ventilation of blow-by gas by introducing air from an intake passage into a crankcase, the engine comprising:
- an air introduction passage that fluidly connects the intake passage to the crankcase;
- a unidirectional valve attached to the crankcase and configured to restrict a flow of gas from the crankcase toward the intake passage through the air introduction passage;
- a coupling passage that guides, into the crankcase, air discharged from the unidirectional valve, wherein
- the coupling passage extends in a direction different from a direction in which air is discharged from the unidirectional valve;
- wherein in a state in which the engine is mounted on a vehicle, a liquid level of an engine oil inside the crankcase when the engine oil is injected into the engine by an amount corresponding to an upper limit of a proper range is referred to as a reference oil level, and
- in the state in which the engine is mounted on the vehicle, an outlet for air from the unidirectional valve is located below the reference oil level, and an opening of the coupling passage into the crankcase is located above the reference oil level.
Dependencies are inferred from the claim text.