Control valve for variable displacement compressor

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(11)

EP 1 420 162 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	15.09.2004 Bulletin 2004/38

(43)	Date of publication A2:
	19.05.2004 Bulletin 2004/21

(21)	Application number: 03025917.0

(22)	Date of filing: 12.11.2003

(51)	International Patent Classification (IPC)⁷: F04B 27/18, F04B 53/10

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
	Designated Extension States:
	AL LT LV MK

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Priority:

14.11.2002 JP 2002330720

(71)	Applicant: Kabushiki Kaisha Toyota Jidoshokki
	Kariya-shi, Aichi-ken (JP)

(72)	Inventors:
	Umemura, Satoshi Kariya-shi, Aichi-ken (JP) Mizutani, Hideki Kariya-shi, Aichi-ken (JP) Murase, Masakazu Kariya-shi, Aichi-ken (JP) Hirose, Tatsuya Kariya-shi, Aichi-ken (JP) Hashimoto, Yuji Kariya-shi, Aichi-ken (JP)

(74)	Representative: Leson, Thomas Johannes Alois, Dipl.-Ing.
	Tiedtke-Bühling-Kinne & Partner GbR, TBK-Patent, Bavariaring 4 80336 München 80336 München (DE)

(54)	Control valve for variable displacement compressor

(57) A variable displacement compressor optionally varies displacement based upon pressure in a crank chamber for adjusting the pressure in the crank chamber by varying an opening degree of a passage that interconnects the crank chamber and one of relatively high and low pressure regions of the refrigeration cycle. A control valve of the variable displacement compressor has a valve seat and a valve. The valve seat has a seat surface for adjusting the opening degree of the passage. The valve has a valve surface for adjusting the opening degree of the passage. At least one of the seat surface and the valve surface is made of a material with relatively high hardness.

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