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2.Theprocessofenergytransformationinhydraulicgearmachines
ofchannelsCLandofinternalclearancesG.Thetransformationofhydraulicenergy
E
hydraccumulatedinthestreamoftheworkingfluidintomechanicalenergyE
mech
isperformedbytheshaft(1)inthefollowingway:thepumpofthehydraulic
systemsuppliesthemotorwiththeworkingmediumthroughtheinletportI,and
themediumflowsintotheintertoothdisplacementchambersT.Next,thechamberT
moveswithrotationalmotion(Iangle)inthesystemofchannelsCLandclearancesG
towardstheoutletportO.Onreachingtheoutletport,theworkingfluidflowsdown
intothetank.Inamotor,therecanbeevenseveraldozendisplacementchambersT
which,actinginsequenceoneafteranother,providehightorqueontheshaftof
themotorM
st.
workingunit
Fig02020Generalmodelofthehydraulicmotorofgroups1-3.
1-shaft,2-gearsystem,3-housing,CL-internalchannels,G-clearances,
T-intertoothdisplacementchamber,I-inlet,O-outlet
WhiletheworkingfluidisflowingfromtheinletzoneItotheoutletzoneO,
itspressurefallsfromahighvaluep
Idowntoalowvaluep
o.Theexpansionofthepres-
sureresultsintherotationofchamberT,therotationofgears(2)andthegenerating
oftorqueM
stonthedriveshaft(1)ofthemotor.
Themodelisacceptableforallthefourgroupsofthehydraulicgearmachines
presentedinfigure1.2.,workingasmotors.However,whenconsideringmachinesof
thefourthgroupworkingasmotors,itisobservedthatthegearsmovewithaplane-
tarymotion.ItcausestheintertoothdisplacementchamberTbeingfilledinand
dischargedanumberoftimesinordertogenerateonerevolutionofthedriveshaft(1).
Amotorworkinginsuchawayisamultiple-actionmotor.Themodelpresentedin
Figure2.2appliestoasingle-actionmotor,though.Nevertheless,thatmodelcanapply