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Title:
EXHAUST GAS CIRCULATING DEVICE
Document Type and Number:
Japanese Patent JP3719611
Kind Code:
B2
Abstract:

PURPOSE: To attain an exhaust gas circulating current of a variable compression ratio engine at a low EGR rate in the case of high load and at a high EGR rate in the case of low load.
CONSTITUTION: Two intake and exhaust valves are provided on a cylinder head 1, and operated by a first cam shaft 10 and a second cam shaft 20. In the intake stroke, the second exhaust valve 5 is operated through a lever 23 and a locker arm 15 by a cam 22 of the second cam shaft 20 to circulate exhaust gas. In the case of high load, the second exhaust valve 5 opens and closes near the top dead center of a piston in a quick close mirror cycle with a low compression ratio to attain a low EGR rate. The phase of the second cam shaft is changed, and in the case of high load, the second exhaust valve 5 openes and closes at 90± before the bottom dead point in a normal cycle with a high compression ratio to attain a high EGR rate.


Inventors:
Ozawa, Godo
Application Number:
JP1994000076604
Publication Date:
November 24, 2005
Filing Date:
March 23, 1994
Export Citation:
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Assignee:
KOMATSU LTD
International Classes:
F02B29/08; F01L1/26; F02B47/08; F02D13/02; F02D15/00; F02M25/07; (IPC1-7): F02D13/02; F01L1/26; F02B29/08; F02M25/07
Domestic Patent References:
JP59046307A
JP54129219A
JP53040115A
JP2173348A