Patent AU-2014259589-B2 (AU)
Title: Gear pump or hydraulic gear motor with helical toothing provided with hydraulic system for axial thrust balance.
Inventor: FERRETTI STEFANO
IPC: F04C2/08
Filed: 2014-05-20
Granted: 2015-12-10
Abstract: (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (10) International Publication Number (43) International Publication Date W O 2014/191253 Al 4 December 2014 (04.12.2014) W I PO I P CT (51) International Patent Classification: DO, DZ, EC, EE, EG, ES, Fl, GB, GD, GE, GH, GM, GT, F04C 2/08 (2006.01) F04C 15/00 (2006.01) HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, (21) International Application Number: MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, PCT/EP2014/060297 OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, (22) International Filing Date: SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, 20 May 2014 (20.05.2014) TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, (25) Filing Language: English (84) Designated States (unless otherwise indicated, for every (26) Publication Language: English kind of regional protection available): ARIPO (BW, GH, (30) Priority Data: GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, AN2013A000102 30 May 2013 (30.05.2013) IT UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, (71) Applicant: MARZOCCHI POMPE S.P.A. [IT/If]; 15, EE, ES, Fl, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, Via 63^ Brigata Bolero, 1-40033 Casalecchio Di Reno MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, (BO) (IT). TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, (72) Inventors: FERRETTI, Stefano; 7, Via Cipollone, I- KM, ML, MR, NE, SN, TD, TG). 40043 Marzabotto (BO) (IT). PERSICI, Danilo; 30/12, Declarations under Rule 4.17: Via Longarola, 1-40012 Calderara Di Reno (BO) (IT). - as to applicant's entitlement to apply for and be granted a (74) Agent: CUTROPIA, Gianluigi; 13, Viale Cavallotti, I- patent (Rule 4.17(ii)) 60035 Jesi (AN) (IT). - of inventorship (Rule 4.17(iv)) (81) Designated States (unless otherwise indicated, for every Published: kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, with international search report (Art. 21(3)) BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, (54) Title: GEAR PUMP OR HYDRAULIC GEAR MOTOR WITH HELICAL TOOTHING PROVIDED WITH HYDRAULIC SYSTEM FOR AXIAL THRUST BALANCE. 011 Z07&O 100 (57) Abstract: Gear pump or hydraulic gear motor with helical toothing provided with hydraulic system for axial thrust balance. A gear pump (100) comprises a toothed driving wheel (1), a toothed driven wheel (2), a front flange (6) from which a projecting por tion (13) of the shaft protrudes frontally, being connected to the shaft (10) of the driving wheel, a back lid (7) fixed to the case (3), and an intermediate flange (8) disposed between the case (3) and the front flange (6). The intermediate flange (8) comprises a first chamber (80) and a second chamber (8 1) connected by means of a connection duct (82) to the inlet or outlet fluid duct of the pump; a compensating ring (9) mounted in the first chamber (80) of the intermediate flange and inserted on a portion (T) of the shaft (10) of r4 the driving wheel, in such manner to compensate the axial forces (A) of the driving wheel and transmit the motion on the shaft (10) of the driving wheel; and a piston (88) mounted in the second chamber (8 1) of the intermediate flange in order to stop against one end of said shaft (20) of the toothed driven wheel, in such manner to compensate the axial forces (B) imposed on the toothed driven wheel.