(19)
(11) EP 1 628 017 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.11.2006 Bulletin 2006/44

(43) Date of publication A2:
22.02.2006 Bulletin 2006/08

(21) Application number: 05017519.9

(22) Date of filing: 11.08.2005
(51) International Patent Classification (IPC): 
F04B 27/18(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(30) Priority: 19.08.2004 JP 2004239161

(71) Applicant: TGK CO., Ltd.
Hachioji-shi, Tokyo 193-0942 (JP)

(72) Inventor:
  • Yoshihiro, Ryosuke
    Hachioji-shi Tokyo 193-0942 (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)

   


(54) Control valve for variable displacement compressor


(57) A control valve for performing a Pd-Ps differential pressure control method in a variable displacement compressor adjusts the difference between an effective pressure-receiving area A on a discharge pressure side of an intermediate structure in which a valve element 14 is made to move in unison with a shaft 18 and an effective pressure-receiving area B on a suction pressure side of the intermediate structure, as required. This allows to obtain desired "differential pressure · crank pressure characteristics" according to the specifications of the control valve. Changes in the effective pressure-receiving areas have almost no influence on "electric current · differential pressure characteristics", i.e. the relationship between the value of the supplied electric current and the differential pressure (Pd-Ps), and hence it is possible to realize the changes in the effective pressure-receiving areas A, B with ease.







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