Patent ID: 9470144
Filing Date: 2016-10-18
CPC Classification: F02B,F02D

Claim Text:
1. A variable compression ratio engine comprising: a variable chamber housing communicating with a combustion chamber of the variable compression ratio engine; a variable chamber piston slidably disposed within the variable chamber housing, and forming a variable chamber together with the variable chamber housing; a connecting shaft connected to the variable chamber piston; a hydraulic pressure plunger connected with the connecting shaft, slildably disposed within the variable chamber housing, the hydraulic pressure plunger, together with the variable chamber housing, forming a hydraulic pressure chamber in which oil for absorbing impact is filled; an oil supplier for supplying oil to the hydraulic pressure chamber; and a compression ratio controller connected to the connecting shaft and controlling a relative position of the variable chamber piston, wherein a leaking chamber is formed between the hydraulic pressure plunger and the variable chamber piston, and wherein an oil drain line is provided within the connecting shaft for the oil in the leaking chamber flowing into an inlet of the oil drain line to be exhausted.