(19)
(11) EP 1 219 835 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.10.2003 Bulletin 2003/42

(43) Date of publication A2:
03.07.2002 Bulletin 2002/27

(21) Application number: 01309877.7

(22) Date of filing: 23.11.2001
(51) International Patent Classification (IPC)7: F04C 2/10, F04C 15/04, F04C 11/00
(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: 25.12.2000 JP 2000392634

(71) Applicant: Mitsuba Corporation
Kiryu-shi, Gunma-ken (JP)

(72) Inventor:
  • Kosugi, Tamio
    Nitta-gun, Gunma-ken (JP)

(74) Representative: Smith, Norman Ian et al
fJ CLEVELAND 40-43 Chancery Lane
London WC2A 1JQ
London WC2A 1JQ (GB)

   


(54) Trochoid pump


(57) A trochoid pump is constructed so that it has a deaerating hole H that communicates with the outside, the hole H being formed on the groove bottom face 10e of the rotor casing in which a trochoid gear T is accommodated. The pump includes inner and outer rotors 12 and 13 with engaging teeth 12a and 13a, which define variable capacity pump spaces 18. The deaerating hole H is formed at a position that is closed by the front side edge, in the direction of rotation at a time when a pump space PR has reached the reached its maximum capacity and vaporized fuel is exhausted when the pump space is about to decrease its capacity. The trochoid pump can suppress generation of a vapor lock phenomenon based on a rise in the fuel temperature without loss of pump efficiency.






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