GEAR-TYPE PUMP OF INTERNAL GEARING Russian patent published in 1998 - IPC

FIELD: hydraulic machines used in hydraulic systems of various machines. SUBSTANCE: body 1, 2, 3 with slide bearing 4, 5, 6 houses gear wheels. Separator is positioned between driving 7 and ring gear wheels and eccentric disc is support of ring gear wheel. Driving gear wheel has hole communicating tooth space with key groove 13. Ring gear wheel has ring groove 14 n outer surface and hole 15 communicating tooth space with ring groove. Length of key 9 is less than width of driving gear wheel, it is arranged in symmetry with width of gear wheel. Slide bearing 4, 5 have screw grooves 16, 17 over entire length and chamfers 18, 19 facing key. EFFECT: prolonged service life of friction units thanks to feed of working fluid from pressure spaces of pump to friction surfaces. 2 dwg