VARIABLE COMPRESSION RATIO INTERNAL COMBUSTION ENGINE

Japanese Patent JP2016205253

A

PROBLEM TO BE SOLVED: To provide a variable compression ratio internal combustion engine which can make compatible oil separation performance at an engine high-load operation, and blow-by gas scavenging performance at an engine low-load operation.SOLUTION: A variable compression ratio internal combustion engine comprises a first backflow passage 70 and a second backflow passage 80 for making a blow-by gas in a crank case 1 flow back to an engine intake passage. An oi separator 73 is arranged in the first backflow passage so that a pressure loss at the passage of the blow-by gas in the first backflow passage becomes larger than a pressure loss at the passage of the blow-by gas in the second backflow passage. The variable compression ratio internal combustion engine changes a mechanical compression ratio so that the mechanical compression ratio is increased as an engine load becomes small, and the first backflow passage and the second backflow passage are constituted so that a volume of the blow-by gas passing in the first backflow passage is reduced, and a volume of the blow-by gas passing in the second backflow passage is increased as the mechanical compression ratio is increased by the relative movement of a cylinder block 2 with respect to the crank case.SELECTED DRAWING: Figure 5

MORI TAIICHI

JP2015088651A

December 08, 2016

April 23, 2015

Click for automatic bibliography generation  

TOYOTA MOTOR CORP

F01M13/00; F01M13/04; F02B75/04; F02D15/02

JP2012197728A	2012-10-18
JPH0544423A	1993-02-23
JP2009180149A	2009-08-13
JPS6451713U	1989-03-30

Atsushi Aoki
Jun Tsuruta
Yuichi Morimoto
Shinji Mitsuhashi
Koichi Ito
Tatsuki Sone

Previous Patent: Waste gate valve mechanism

Next Patent: A supercharge system for internal-combustion engines