(19)
(11) EP 0 889 299 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.02.1999 Bulletin 1999/05

(43) Date of publication A2:
07.01.1999 Bulletin 1999/01

(21) Application number: 98112413.4

(22) Date of filing: 03.07.1998
(51) International Patent Classification (IPC)6: F28F 9/02, F28D 7/10
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 04.07.1997 JP 179273/97

(71) Applicant: Denso Corporation
Kariya-city, Aichi-pref., 448-8661 (JP)

(72) Inventors:
  • Sugimoto, Tatsuo, Denso Corp., Intel. Pro. Dept.
    Kariya-city, Aichi-pref., 448-8661 (JP)
  • Uchikawa, Akira, Denso Corp., Intel. Pro. Dept.
    Kariya-city, Aichi-pref., 448-8661 (JP)
  • Sakane, Takaaki, Denso Corp., Intel. Pro. Dept.
    Kariya-city, Aichi-pref., 448-8661 (JP)

(74) Representative: Klingseisen, Franz, Dipl.-Ing. et al
Patentanwälte, Dr. F. Zumstein, Dipl.-Ing. F. Klingseisen, Postfach 10 15 61
80089 München
80089 München (DE)

   


(54) Heat exchanger having a double pipe construction


(57) An outer cylindrical pipe (11) forming a double pipe type oil cooler (1) is disposed within lines extending from both outer surfaces of each tube (2), which defines the width dimension of the tube (2). That is, the double pipe type oil cooler (1) is located at a position where the flow speed of cooling water is maximum. Thereby, as the cooling water flows from the tube (2) is used efficiently for cooling, the cooling performance of the oil cooler (1) is further improved. Further, the double pipe type oil cooler (1) is formed into flat shaped double pipe in which the longitudinal axis thereof is more than twice as long as the latitudinal axis thereof, and the latitudinal axis of the oil cooler (1) is smaller than the width dimension of the tube (2).






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