(19)
(11) EP 1 174 602 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.10.2003 Bulletin 2003/40

(43) Date of publication A2:
23.01.2002 Bulletin 2002/04

(21) Application number: 01117221.0

(22) Date of filing: 16.07.2001
(51) International Patent Classification (IPC)7: F01P 3/02, F01P 7/16
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 18.07.2000 JP 2000218008
20.06.2001 JP 2001187149

(71) Applicant: HONDA GIKEN KOGYO KABUSHIKI KAISHA
Minato-ku Tokyo (JP)

(72) Inventors:
  • Kikuchi, Kazunori
    4-1, Chuo 1-chome, Wako-shi, Saitama (JP)
  • Iijima, Satoshi
    4-1, Chuo 1-chome, Wako-shi, Saitama (JP)
  • Kubota, Ryo
    4-1, Chuo 1-chome, Wako-shi, Saitama (JP)

(74) Representative: Liska, Horst, Dr. et al
Weickmann & Weickmann Patentanwälte Postfach 860 820
81635 München
81635 München (DE)

   


(54) Cooling structure for internal combustion engine


(57) The invention provides less expensively a cooling structure for an internal combustion engine which, despite a simple structure, can control the flow of coolant to a cylinder and a cylinder head without allowing the coolant to stay in the cylinder, according to the temperature of the coolant, and which can expect the attainment of both the effect of suppressing a drop in temperature of residual gas and an anti-knocking effect.
A cooling structure for an internal combustion, comprising a first coolant circulation system and a second coolant circulation system, the first coolant circulation system having a first thermostat (5) for adjusting the amount of coolant to be circulated between a radiator (10) and the internal combustion engine, the second coolant circulation system having a second thermostat (20), the second thermostat (20) making control so that the coolant circulates in parallel to a cylinder (2) and a cylinder head (3) when the temperature of the coolant is lower than a predetermined coolant temperature, while when the coolant temperature is higher than the predetermined coolant temperature, the coolant circulates in series from the cylinder (2) to the cylinder head (3).







Search report