Crankcase ventilation device for vehicle

Patent metadata

Field	Value
Publication number	US-9995192-B2
Application number	US-201415021265-A
Country	US
Kind code	B2
Filing date	Sep 3, 2014
Priority date	Sep 10, 2013
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

The present invention relates to a crankcase ventilation device for a vehicle and, more specifically, to a crankcase ventilation device for a vehicle, which: prevents a back flow of blow-by gas to a new air inflow valve according to a rise in pressure and a rise in a flow rate inside a crankcase; prevents deterioration in the inside of an engine due to unburned fuel contained in the blow-by gas and minute particles of engine oil, generation of sludge, and an engine failure; and minimizes contamination of an intake system by providing a new air inflow control valve having a nozzle and a diaphragm, so as to block a back flow of the blow-by gas to a new air inflow hose due to an excessive rise in pressure inside the crankcase during a process for re-circulating and re-burning the blow-by gas discharged from the crankcase of the vehicle.

First claim

The invention claimed is:

1. A crankcase ventilation device for a vehicle comprising:
a crankcase ( 400 ); and
a cam cover ( 300 ) situated on the upper side of the crank case ( 400 ) to seal the crankcase ( 400 );
wherein the cam cover ( 300 ) comprises:
a fresh air inflow control valve ( 310 ) situated on the cam cover ( 300 ), one side of which is connected to the cam cover ( 300 ) and an opposite side of which is connected to a fresh air inflow hose ( 220 ) so that fresh air is introduced into the crank case ( 400 ); and
a pressure control valve ( 320 ) situated on the upper side of the cam cover ( 300 ) to control a pressure in the crankcase ( 400 );
wherein a nozzle ( 311 ) is situated in the interior of the fresh air inflow hose ( 220 ) of the fresh air inflow control valve ( 310 ), and the nozzle ( 311 ) controls inflows of the fresh air into the crankcase ( 400 ) according to a control of the pressure in the crankcase ( 400 ) of the pressure control valve ( 320 );
wherein a diaphragm ( 312 ) is situated on the lower side of the nozzle ( 311 ) to prevent backward flows of a blow-by gas to the fresh air inflow hose ( 220 ).

2. The crankcase ventilation device according to claim 1 , further comprising:
an oil separator ( 330 ) communicated with the pressure control valve ( 320 ) to separate oil particles from the blow-by gas discharged from the crank case ( 400 ).

3. The crankcase ventilation device according to claim 2 , wherein the pressure control valve ( 320 ) is any one of an orifice valve, a pressure reducing valve, and a solenoid valve electrically connected to an ECU.

4. The crankcase ventilation device according to claim 1 , wherein in a low-speed/middle-speed of an engine provided with the crankcase ventilation device for a vehicle, the pressure control valve ( 320 ) is opened according to the amount of generated blow-by gas in the crankcase ( 400 ) such that the blow-by gas in the crankcase ( 400 ) flows into an intake manifold ( 500 ) and is mixed with the fresh air supplied from the air inflow hose ( 210 ) to be reintroduced into the crankcase ( 400 ) and burned again, and the fresh air is introduced into the crankcase ( 400 ) through the fresh air inflow control valve ( 310 ).

5. The crankcase ventilation device according to claim 1 , wherein in a high-speed condition of an engine provided with the crankcase ventilation device for a vehicle, the amount of the blow-by gas in the crankcase ( 400 ) increases so that when the blow-by gas is introduced into the fresh air inflow hose ( 220 ), the blow-by gas is prevented from being introduced into the fresh air inflow hose ( 220 ) through the fresh air inflow control valve ( 310 ).

Assignees

• Gm Global Tech Operations Llc

Inventors

• Kang Hyuk Jin

Classifications

• F01M13/022

  using engine inlet suction · CPC title

• F02M25/06

  adding lubricant vapours · CPC title

• F01M13/0011 Primary

  Breather valves · CPC title

• F01M13/028 Primary

  of positive pressure · CPC title

• F01M13/023

  Control valves in suction conduit · CPC title