(19)
(11) EP 0 216 999 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.07.1988 Bulletin 1988/29

(43) Date of publication A2:
08.04.1987 Bulletin 1987/15

(21) Application number: 86108080

(22) Date of filing: 13.06.1986
(84) Designated Contracting States:
DE FR GB

(30) Priority: 29.09.1985 CN 85107186

(71) Applicant: Cheng, Anqiang
 ()

(72) Inventor:
  • Cheng, Anqiang
     ()

   


(54) An external gear pump or gear motor unit of the asymmetric radial floating type


(57) On the basis of asymmetry theory the low-pressure zone is enlarged and the high-pressure zone is reduced; the performance of said gear pump or gear motor is optimized by means of an asymmetric axial and radial floating compensation device (5); the realization of axial and radial floating compensation provides higher volumetric efficiency; by adopting the integral structure higher mechanical efficiency is obtained and the noise is reduced; the stable radial floating device makes the high-pressure radial sealing practicable. The high-pressure zone is reduced, the radial force is reduced and the lifetime of said gear pump or gear motor is prolonged. With the invention, the gear type hydraulic machinery can be pressurized up to 321 kg·cm2 level.






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