V-TYPE INTERNAL COMBUSTION ENGINE

Title:

V-TYPE INTERNAL COMBUSTION ENGINE

Document Type and Number:

Japanese Patent JP2008175135

Kind Code:

A

Abstract:

To equalize compression ratio change amount of a right and a left bank when a multilink type variable compression ratio mechanism is applied to a V-type internal combustion engine.

This engine is provided with: an upper link 4; a lower link 3; a control link 5; a control shaft 6 oscillatably supporting the other end of the control link 5; and a multilink mechanism variably controlling an engine compression ratio by relatively changing an oscillation center position of the control link 5. Link geometries constructed by each link 3, 4, 5 are the same for a right and a left bank 18, 19 if heights of pistons in cylinders are the same, and are set to overlap each other when they are rotated around a rotation axis of a crankshaft by a bank angle. The control shaft 6 is moved to draw acircular arc locus around the rotation axis of the crankshaft 1 to change engine compression ratio.

Inventors:

HARA MASAYUKI
USHIJIMA KENJI
TAKAHASHI NAOKI

Application Number:

JP2007009346A

Publication Date:

July 31, 2008

Filing Date:

January 18, 2007

Export Citation:

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Assignee:

NISSAN MOTOR

International Classes:

F02B75/04; F01B9/04; F01B31/14; F02B75/22; F02B75/32; F02D15/02; F16H21/34

Attorney, Agent or Firm:

Masaki Goto
Masahiro Fujii
Yasunari Mita
Masaaki Iida

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