COMBINATION CENTRIFUGAL-GEAR PUMP

FIELD: mechanical engineering; pumps. ^ SUBSTANCE: invention relates to oil pumps used in lubrication system of aircraft gas-turbine engines. Combination centrifugal-gear has housing accommodating support bearings and shafts with gears fitted in bearings. From rear side gears adjoin movable spring-loaded pivots and are provided from end face pointed to pump inlet with pre-engaged centrifugal impellers. Pivots are spring-loaded relative to rear sides of gears to form ring channel between housing and pivot communicating through restrictor with delivery space of pump. Insulated chamber is made in housing at least behind one of support bearings from side of its end face surface, said chamber communicates through bearing with ring channel and through channels made in shaft with inlet of pre-engaged centrifugal impeller. Channels made in shaft are formed by central and radial holes. ^ EFFECT: increased efficiency of cooling of pump support bearings owing to provision of additional lubrication system with flow of oil along closed circuit under action of pressure differential built by pre-engaged impeller. ^ 2 cl, 1 dwg