GB1380768A - Gear pumps - Google Patents

Abstract

1380768 Rotary positive displacement machines LAMBORGHINI OLEODINAMICA SpA 17 March 1972 [17 March 1971] 12750/72 Heading F1F A gear pump comprises externally meshing gearwheels and bushes bearing against the axial endfaces of the gear wheels, one bush 3 having eccentrically positioned rings 24, 25 which bear against the bush 3 in such a manner as to redistribute the pressure on the outer side of the bush so that the resulting centre of pressure coincides with the centre of pressure 21 generated by the asymmetrical pressures inside the bush 3. Each ring is stepped so as to have a smaller diameter portion which slides in an end cover of the housing, the larger diameter part 30 having an axially extending perimeter flange 26 which slidingly and sealing engages bush 3. The outer space 27 communicates with the high-pressure port 15 through connection 23 and the inner space 28 communicates with low-pressure port 14. Clearly, ring 24 is urged sealingly against bush 3. A gasket 31 surrounds ring 24 to seal the high-pressure passage 27 from low-pressure space 28. A seal on the inlet side, to act as a separator of high and low pressure sides of the bushes, is also described Figs. 5 and 6, (not shown).