(19)
(11) EP 0 855 506 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.01.1999 Bulletin 1999/01

(43) Date of publication A2:
29.07.1998 Bulletin 1998/31

(21) Application number: 98101411.1

(22) Date of filing: 27.01.1998
(51) International Patent Classification (IPC)6: F04B 27/18
(84) Designated Contracting States:
AT BE CH 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: 27.01.1997 JP 12201/97

(71) Applicant: Sanden Corporation
Isesaki-shi, Gunma 372-8502 (JP)

(72) Inventors:
  • Taguchi, Yukihiko
    Isesaki-shi, Gunma 372 (JP)
  • Terauchi, Kiyoshi
    Isesaki-shi, Gunma 372 (JP)

(74) Representative: Prüfer, Lutz H., Dipl.-Phys. et al
PRÜFER & PARTNER GbR, Patentanwälte, Harthauser Strasse 25d
81545 München
81545 München (DE)

   


(54) Variable-displacement compressor


(57) A variable-displacement compressor comprises a compressor housing having a crank chamber, a discharge chamber, and a suction chamber. The variable-displacement compressor comprises a driving shaft rotatably supported by the compressor housing to be located in the crank chamber and a slant plate located in the crank chamber to be coupled to the driving shaft. The slant plate has a variable slant angle for the driving shaft. The variable-displacement compressor varies the variable slant angle in accordance with a pressure difference between the crank chamber and the suction chamber to control a compression capacity. The variable-displacement compressor further comprises a first communication path through which the crank chamber communicates with the discharge chamber, a first valve device for adjusting the opening area of the first communication path to control the pressure in the crank chamber, a second communication path through which the crank chamber communicates with the suction chamber, and a second valve device for adjusting the opening area of the second communication path in accordance with the pressure difference. More particularly, the second valve device perfectly closes the second communication path when the pressure difference becomes a predetermined pressure difference.






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