VARIABLE COMPRESSION RATIO INTERNAL COMBUSTION ENGINE

摘要

It is an object to increase the reliability and durability by minimizing mixing/entry of foreign matter (contaminants) into a speed reducer. The speed reducer is provided for reducing rotation of an actuator of a variable compression ratio mechanism and for transmitting the reduced rotation to a control shaft of the variable compression ratio mechanism. The actuator and the speed reducer are attached to a sidewall of an engine main body with a housing therebetween. An oil filter, which removes contaminants from within lubricating oil, is attached to the housing with an oil-passage-forming body therebetween. A portion of the lubricating oil supplied from the oil filter immediately after having been filter-purified is supplied via a bypass oil passage, formed in the oil-passage-forming body and the housing, into a speed-reducer accommodation chamber of the housing.

主权项

1. A variable compression ratio internal combustion engine having a variable compression ratio mechanism that enables an engine compression ratio to be changed depending on a rotational position of a control shaft driven by an actuator, a speed reducer that reduces rotation of the actuator and transmits the reduced rotation to the control shaft, the actuator and the speed reducer being attached to a sidewall of an engine main body with a housing therebetween, comprising:
an oil filter attached to the housing for removing contaminants from within lubricating oil; and a bypass oil passage provided for supplying a portion of the lubricating oil after having passed through the oil filter to lubricated parts of the speed reducer installed in the housing.