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SINGLE FLUID POWER PUMP

TM-55-1930-209-14P-6 Water Purification Barges (NSN 1930-01-234-2165) Chlorination System Manual
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DECKMASTER Thrust  plate COMMERCIAL'S    original    "pressure-pocketed"    thrust plates are another built-in feature of Model 15H pumps and  motors  and  serve  a  most  important  function.    By "pressure-pocketing",  a  dynamic  seal  is  created  which prevents oil under high pressure from flowing toward the low   pressure   side   of   the   thrust   plate.      Therefore,   a positive  seal  is  created  which  contributes  to  volumetric efficiency  of  pumps  in  excess  of  90%.    These  floating type  thrust  plates  exert  a  force  at  all  times  against  the small sealing area at the gear faces.  The small loss of mechanical   efficiency   due   to   friction   between   thrust plates and gear faces results in considerable gain in this volumetric efficiency. Bearings Bearings    are    built    into    COMMERCIAL    Model    15H pumps  and  motors  to  maintain  positive  shaft  and  gear alignment.  Anti-friction bearings are designed to absorb all    radial    and    thrust    loads    always    present    to    the unbalanced loading conditions inherent in gear type and motors.      Two   heavy   duty,   anti-friction   inboard   gear journal. ings are provided for each gear. COMMERCIAL     also     provides     a     ruls6¢d     outboard bearing,  a  ball  bearing  type,  for  all  pumps  and  motors. Bearings are fit to the gear hubs, not to the drive shaft. Because   gear   hub   is   integral   with   the   gear,   larger bearings,  necessary  for  satisfactory  operation  at  2000 psi, are possible.  Such gear hub construction permits     more     accurate     machining     held     to     closer tolerance. Gears For  high  volumetric  efficiency  of  gear  type  pumps  and motors, complete sealing between all gear tooth contact surfaces  must  be  maintained.    As  operating  pressures increase,     this     contact     becomes     more     difficult     to maintain.    COMMERCIAL  found  that  gears  which  were obtainable   on   the   open   market   did   not   have   tooth surfaces    smooth    and    sufficiently    accurate    for    high efficiency   operation   at   1500   psi   and   higher.      Gear surfaces   are   precision   finished,   each   pair.      matched perfectly.      COMMERCIAL   manufactures   gears   for   all their   pumps   and   motors   and   makes   every   effort   in design   and   manufacture   to   assure   producing   gears which will give the quietest and most efficient operation.







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