JP2016200136A5

JP2016200136A5 -

Info

Publication number: JP2016200136A5
Application number: JP2016017731A
Authority: JP
Filing date: 2016-02-02
Publication date: 2018-09-27
Anticipated expiration: 2036-02-02

Claims

A blow-by gas inlet for introducing blow-by gas;
A blow-by gas discharge port for discharging blow-by gas to the intake side;
An upstream oil separation unit that separates the oil mist contained in the blowby gas, and is disposed apart in the flow direction of the blowby gas in the blowby gas passage formed between the blowby gas introduction port and the blowby gas discharge port; A downstream oil separator,
Between the upstream oil separation part and the downstream oil separation part, an oil drain hole that is formed on the bottom surface of the blow-by gas passage and discharges oil;
A oil separation structure for an internal combustion engine equipped with an oil drain passage having one end communicating with the opening portion opening to the other end Gao Irupan communicated with the oil drain hole,
The upstream oil separation section has an upstream flow hole through which blow-by gas flows; the downstream oil separation section has a downstream flow hole through which blow-by gas flows;
An oil separation structure for an internal combustion engine, wherein an opening area of the opening is formed smaller than an opening area of the oil drain hole.

The blow-by gas passage is formed in a cylinder block having a crank chamber;
By attaching a chain case that covers a timing chain to which the driving force of the crankshaft is transmitted to the end of the cylinder block, a chain housing chamber surrounded by the chain case and the cylinder block is formed,
2. The oil separation structure for an internal combustion engine according to claim 1, wherein the cylinder block has a communication passage that communicates the chain housing chamber and the blow-by gas passage. 3.

The oil drain passage is formed inside the cylinder block,
The oil separation structure for an internal combustion engine according to claim 2, wherein the opening is formed by being sandwiched between a lower part of the cylinder block and an upper part of the oil pan.

An on-off valve for opening and closing the blow-by gas discharge port;
The downstream flow hole is formed so that the sum total of the opening areas of the downstream flow holes is not more than twice the passage area immediately upstream of the on-off valve. An oil separation structure for an internal combustion engine according to any one of the preceding claims.

A cylinder head containing a camshaft having a cam for driving a valve, and having a cam chamber communicating with the blowby gas passage through the blowby gas inlet;
A volume chamber for taking in external air, a vacuum pump drive shaft connected to the cam shaft, a vacuum pump bearing portion that rotatably supports the vacuum pump drive shaft and partitions the volume chamber from the cam chamber, and the vacuum pump bearing An oil supply passage for supplying lubricating oil to the part, and a vacuum pump attached to the cylinder head,
The oil separation structure for an internal combustion engine according to any one of claims 1 to 4, further comprising a discharge hole for discharging compressed air compressed inside the vacuum pump to the cam chamber.

The cylinder block has a skirt portion;
4. The oil separation structure for an internal combustion engine according to claim 2 , wherein the oil drain passage is formed integrally with the cylinder block so as to communicate an upper portion and a lower portion of the skirt portion. 5. .

An oil pan attached to the cylinder block and the lower part of the cylinder block;
A case portion formed on a side surface of the cylinder block;
A cover member attached to the case portion;
An oil separation chamber formed by the case portion and the cover member;
A blow-by gas inlet for introducing blow-by gas into the oil separation chamber;
A blow-by gas discharge port for discharging blow-by gas to the intake side from the oil separation chamber;
An oil separation unit installed in the oil separation chamber and separating oil mist contained in blow-by gas;
An oil drain hole formed on the bottom surface of the oil separation chamber for discharging the oil separated in the oil separation portion;
An oil separation structure for an internal combustion engine having an oil drain passage that communicates with an opening that has one end communicating with the oil drain hole and the other end communicating with the oil pan,
The oil separation part has a partition wall of the case part arranged in the case part, and a plurality of communication holes arranged in the cover member so as to contact the partition wall of the case part and through which blow-by gas passes. A partition wall of the cover member,
The cover member has a collision wall that collides blow-by gas that has passed through the communication hole,
The oil drain passage is narrowed between the lower portion of the cylinder block and the upper portion of the oil pan, and the opening area of the opening is formed smaller than the opening area of the oil drain hole. An oil separation structure for an internal combustion engine.