GB840000A - Improvements in gear pumps - Google Patents

Abstract

840,000. Gear pumps. BORG-WARNER CORPORATION. May 6, 1957 [May 25, 1956 (2)], No. 14411/57. Class 110 (2). In a multiple gear pump, Fig. 1, comprising gear pumps P1, P2 mounted in a common casing having intersecting chambers 20, 21, the movable end bushings 32, 43 and 33, 44 are fed with pressure fluid through a conduit 38, are spring-loaded as shown and are bounded by steel rings 71, 77. The cover member 13 may be formed integral with the casing 11 in which case the bushings 45 may be of the barrel type, (see Figs. 3 and 4 not shown), respectively. Again, the shank portions of the bushings may be concentric to the axis of the gears, (see Fig. 5 not shown). In a modification, Fig. 6, the pump is provided with pressure-loaded end bushings 32<1>, 33<1>, 43<1>, 44<1> and the bushings 43<1>, 441 are associated with members 80<1>, 81<1> to define pressure chambers 90<1>, 91<1>. In another modification, Fig. 10, a cover member 80a and an end plate member 32a co-operate to form a pressure-loading chamber 74a. The device of Fig. 6 may incorporate barrel-type bushings or concentrically loaded bushings, (see Figs. 12 and 13 not shown). Both pumps incorporate shear sections in their drive.