(19)
(11) EP 0 361 716 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.07.1990 Bulletin 1990/28

(43) Date of publication A2:
04.04.1990 Bulletin 1990/14

(21) Application number: 89309135.5

(22) Date of filing: 08.09.1989
(51) International Patent Classification (IPC)5: F04C 2/10, F04C 15/00
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 28.09.1988 GB 8822696
09.06.1989 GB 8913368

(71) Applicant: CONCENTRIC PUMPS LIMITED
Birmingham B24 8HW (GB)

(72) Inventor:
  • Hodge, Steve
    Tamworth Staffordshire, B77 1PF (GB)

(74) Representative: Hands, Horace Geoffrey et al
GEORGE FUERY & CO Whitehall Chambers 23 Colmore Row
Birmingham B3 2BL
Birmingham B3 2BL (GB)


(56) References cited: : 
   
       


    (54) Improvements relating to gerotor pumps


    (57) A gerotor pump can have a particularly short axial length by fixing the main shaft in the body (instead of journalling it in the body) and journalling the rotor on the shaft (instead of making the rotor fast with the shaft). Figure 3 shows an arrangement in which gear 24 transmits drive to the pump and has an axial extension 38 journalled on the fixed shaft 18 and keyed or splined at 46 to the rotor which surrounds the extension and hence is only indirectly supported and journalled on the shaft. 14 represents the usual annulus with which the rotor engages in conventional gerotor pump fashion.







    Search report