真空助力器主缸工作原理

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1、ActuationPrincipleoffunction真空助力器制动主缸功能原理NoVacuumCondition无真空状态WorkingChamber工作腔VacuumChamberVacuumValve真空阀真空腔AirValveOpenVacuumValveClosedKeyseatedagainstrearshellPlungervalveseatedonreactiondisc空气阀打开真空阀关闭键靠在后壳体上AirValve空气阀柱塞阀顶在反作用盘上AtBalance平衡状态-Vacuuminfrontchamberpullsthediaphr

2、agmplateforward-Airvalvecloses-Vacuumvalveopens-Vacuumintheworkingchamberincreasesuntilthepressuredifferentialhasreducedto‘balance’thediaphragmplatewithboththeairandvacuumvalvesclosed-真空腔的真空吸引膜片盘向前运动-空气阀关闭-真空阀打开Patm-AmbientAtmosphericPressure-工作腔内的真空增加，直至两腔压力差降低到“平衡状态”，膜片盘带动空气阀及真空阀

3、全部Pw-WorkingChamberPressure关闭Pvac-VacuumChamberPressureBrakesApplied实施制动-Forceappliedtotheinputrodopenstheairvalve-Vacuumintherearchamberdecreases,henceincreasingthepressuredifferential-Diaphragmmovesforwarduntiltheoutputrodforceisequaltotheinputforcemultipliedbytheboostratio-React

4、iondiscextrudesaroundratiodisc-Whentheoutputforcebecomesgreaterthantheinputforcemultipliedbytheboostratio,thereactiondiscPatm-AmbientAtmosphericPressureextrudesfurtherpushingtheplungervalvebackandclosingtheairvalvePw-WorkingChamberPressurePvac-VacuumChamberPressureBrakesApplied实施制动

5、-在输入杆上加力使空气阀打开-工作腔内的真空降低，因此两腔压力差增加-膜片向前运动，直到输出力等于输入力乘以助力比-反作用盘挤压包裹助力比调整盘-当输出力大于输入力乘以助力比时，反作用盘进一步挤压，推动柱Patm-AmbientAtmosphericPressure塞向后退（相对阀体而言），并将Pw-WorkingChamberPressure空气阀关闭。Pvac-VacuumChamberPressureBrakesReleased释放制动（减轻制动）-Vacuumvalveopens-真空阀打开-Vacuumintherearchamberincreas

6、es,hencereducingthepressuredifferential-工作腔真空增加，因此两腔压力差降低-Diaphragmplateassemblyreturnstothe‘balance’(vacuumandairvalvesbothclosed)positionduetotheactionofthemainspring-在主回位弹簧的作用下，膜片盘组件回复到“平衡状态”（空气阀及真空阀均为Patm-AmbientAtmosphericPressure关闭状态）。Pw-WorkingChamberPressurePvac-VacuumChamb

7、erPressureFlowThroughaTandemBooster双腔助力器内的空气流动情形VacuumChamberPressurePVAC真空腔压力PVACWorkingChamberPressurePW工作腔压力PWAtmosphericPressurePATM大气压力PATMKLSC115THEDRshowninbalancepositionLSC115HEDR平衡状态示意图Principleoffunction–Actuation真空助力器制动主缸功能原理Fluidreservoir制动液贮液罐BoosterhousingPic.A助力器壳体V

8、acuumchamber真空腔Dilagbush零件