GB883356A - Improvements in or relating to pumps - Google Patents

Abstract

883,356. Gear pumps. THOMPSON RAMO WOOLDRIDGE Inc. April 24, 1959, No. 14115/59. Class 110 (2). A gear pump, Figs. 3 and 5, is provided with fluid-pressure and spring-loaded end bushings consisting of concentric portions 31, 29 and an eccentric portion 34. Each sealing surface 32 has recesses 53, 54 to facilitate filling and discharge operations respectively and a segmental groove 70 for distributing the forces acting thereon. Each bushing is additionally provided with a groove 57 which is fed with lubricant through bores 38, 60a, 60, 61 and also with a groove 64 which communicates with a trapping relief recess 56 by way of a bore 69. The groove 57 may communicate with the surface 33 and have its recess 64 circumferentially continuous and in communication with the trapping relief recess 56 (see also Figs. 1, 4 and 6 (not shown). In a second modification, Fig. 7, the recess 64b is again continuous and communicates with a series of pockets 71 and the trapping relief recess 56b through bores 72, 69b respectively. The bore 57 may be intersected by bores perpendicular thereto (see Fig. 8, not shown).