| 摘要 |
1,115,194. Gear pumps and motors. ROBERT BOSCH G.m.b.H. July 2, 1965 [July 4, 1964], No.28027/65. Heading F1F. In a pressure-loaded gear pump or motor, bearing members or bodies 17, 18, Fig.1, are pressed against the sides of a pair of externallymeshing gears 13, 14 by pressure communicated to a recess or zone 24 at the back of each member through an axially-orientated passage 25 on the high-pressure side of the meshing gear-teeth, the recess being sealed by an O-ring 23. Each bearing member also includes a pair of blind bores (37, 38), Figs. 2 and 3 (not shown), which are in register with gear-tooth spaces upstream from the passage 25 and effect noise-reduction by serving as chambers wherein pressure fluctuations are dissipated. In a modification, Figs. 4 and 5, pairs of axially-orientated bores 39, 41 and 40, 42 in each bearing member are connected by further bores 43, 44 to the passage 25, the recess 24 thereby rendering the same service as the bores (37, 38). In a further modification, Fig. 6 to 8 (not shown), to effect noise reduction a pair of inclined bores (47, 48) in each bearing member intersect the passage 25 and are connected to one another by a groove (49) situated in the face of the member adjacent the gears to minimize cavitation in the tooth-spaces approaching the high-pressure side. Each bearing member includes a pair of slots 28, 29 to render radially pressure-loaded portions 30, 31 resilient. |
