(19)
(11) EP 1 462 650 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.07.2006 Bulletin 2006/27

(43) Date of publication A2:
29.09.2004 Bulletin 2004/40

(21) Application number: 04005114.6

(22) Date of filing: 04.03.2004
(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 IT LI LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 28.03.2003 JP 2003089841

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

(72) Inventors:
  • Yoshihiro, Ryosuke
    Hachioji-shi Tokyo 193-0942 (JP)
  • Kajiwara, Morimitsu
    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) In a control valve for a variable displacement compressor, a valve section 10 for controlling the refrigerant flow rate at discharge pressure Pd to supply refrigerant at a control pressure Pc to a crankcase is implemented by a spool valve structure. A spool valve element 15 and a coaxial shaft 18 are configured such that the spool valve element 15 and the shaft 18 oppositely receive the discharge pressure Pd and the suction pressure Ps, respectively. The differential pressure between the discharge pressure Pd and suction pressure Ps, which is to be controlled, is set by a duty ratio controlled solenoid section 20. The spool valve element 15 performing micro vibrations due to duty ratio control is prevented from colliding against a valve seat 16 when it is close to the valve-closing position, so that it is possible to enhance the valve lift characteristics, and to improve durability of valve component parts.







Search report