Displacement control valve for use in a variable displacement compressor

(19)

(11)

EP 0 907 021 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	08.09.1999 Bulletin 1999/36

(43)	Date of publication A2:
	07.04.1999 Bulletin 1999/14

(21)	Application number: 98118560.6

(22)	Date of filing: 01.10.1998

(51)	International Patent Classification (IPC)⁶: F04B 27/18

(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:

03.10.1997 JP 271516/97

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

(72)	Inventors:
	Terauchi, Kiyoshi c/o Sanden Corporation Isesaki-shi, Gunma 372 (JP) Taguchi, Yukihiko c/o Sanden Corporation Isesaki-shi, Gunma 372 (JP) Ogura, Toshiyuki c/o Sanden Corporation 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)	Displacement control valve for use in a variable displacement compressor

(57) In a displacement control valve (10) for use in a variable displacement compressor including a suction chamber (51), a crank chamber (43), and a discharge chamber (52), a valve casing (11) defines a communication passage (17) for communicating a discharge chamber (52) with a crank chamber (43) to conduct gas from the discharge chamber to the crank chamber. A valve member (18) is placed in the communication passage and moved in a predetermined direction by a moving mechanism (12, 16, 19, 20, 21) to adjust a substantial opening degree of the communication passage. The valve member has a first and a second surface (18a, 18b) opposite to each other in the predetermine direction. The displacement control valve has a pressure introducing passage (22) for applying gas pressure to the first and the second surfaces in common in spite of adjusting the substantial opening degree.

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