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1.Definition,systematicsandmethodologyof
designinghydraulicgearmachines
1.1.Definitionandsystematics
Theconceptof‘hydraulic(fluidpower)gearmachines’(HGM)referstosuchatypeof
machinesutilizedinthefluidpowerdriveandcontrolsystems,wheregearsconsti-
tutethebasicsystembothintermsoftheprinciplesofdesignandoperation.
Figure1.1presentsthesimplifieddiagramofHGM.Themachineconsistsof
agearsystemandahousing.Betweenthegearteeth,theintertoothdisplacement
chambersarecreated,andinthehousingthechannelsandtheclearancesareformed.
Fig01010Simplifieddiagramofthehydraulicgearmachine(HGM)
Theintertoothdisplacementchambersco-operatewiththechannelsandclearances
system,transferringtheworkingmediumfromtheinletsidetowardstheoutletside
ofthemachine.TheHGMcanperformtwobasicfunctions:
-thefunctionofapump,inwhichmechanicalenergyfromthemotoristrans-
formedintohydraulicenergyaccumulatedinthedischargedworkingfluid-
seethesolidlineinFigure1.1.