(19)
(11) EP 0 226 125 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.07.1989 Bulletin 1989/27

(43) Date of publication A2:
24.06.1987 Bulletin 1987/26

(21) Application number: 86116785.6

(22) Date of filing: 03.12.1986
(51) International Patent Classification (IPC)4: F04B 49/08, F04B 1/26
(84) Designated Contracting States:
BE DE FR GB IT SE

(30) Priority: 13.12.1985 US 808527

(71) Applicant: Vickers Incorporated
Troy Michigan 48084 (US)

(72) Inventor:
  • Taplin, Lael Brent
    Union Lake Michigan 48085 (US)

(74) Representative: Blumbach Weser Bergen Kramer Zwirner Hoffmann Patentanwälte 
Sonnenberger Strasse 100
65193 Wiesbaden
65193 Wiesbaden (DE)


(56) References cited: : 
   
       


    (54) Variable displacement pump system


    (57) A variable displacement pump system including a pressure and a load sensing compensator (18,19) for operating a pump adjusting mechanism (11-13) to vary the displacement by applying hydraulic fluid to a hydraulic positioning piston (13) and a spring biased piston (12). The load sensing compensator (19) senses the pressure drop of the working fluid flow across a system valve (15) and applies a modulated pressure to the hydraulic positioning piston (13). The spring biased piston (12) is connected (line 21) to a load sensing line (20).






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