力士乐REXROTH顶轴油泵A4VSO355DRG/30R-PPB13N00

力士乐REXROTH顶轴油泵A4VSO355DRG/30R-PPB13N00 德国原装博世力士乐REXROTH顶轴油泵 液压柱塞泵 机械油泵 原装现货

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力士乐REXROTH顶轴油泵A4VSO355DRG/30R-PPB13N00

油量调节

为了适应柴油机负载的要求，喷油泵的供油量必须能够在大供油量(全负荷)到零供油量(停车)的范围内进行调节。 供油量的调节是通过齿杆、转动套使喷油泵的全部柱塞同时转动来实现的。 当柱塞转动时，供油开始时间不变，而供油终了时间，则由于柱塞斜边对柱塞套回油孔位置的改变而变更了。随着柱塞转动的角度不同，柱塞的有效行程也就不同，因而供油量也随之改变。

柱塞对于不供油位1转动的角度越大，则柱塞上端面到打开拄塞套回油孔的斜边距离也越大，供油量也就越大，若柱塞转动的角度较小，则断油开始较早，供油量也较小。当柴油机停车时必须断油，为此，可将柱塞上的纵向槽转到正对着柱塞套上回油孔。此时，在整个柱塞行程中，柱塞套内的燃油一直通过纵向槽、回油孔流回油道，没有压油过程，故供油量等于零。

机械原理

吸油压油喷油泵的吸油和压油，由柱塞在柱塞套内的往复运动来完成。当柱塞位于下部位置时，柱塞套上的两个油孔被打开，柱塞套内腔与泵体内的油道相通，燃油迅速注满油室。当凸轮顶到滚轮体的滚轮上时，柱塞便升起。从柱塞开始间向上运动到油孔被柱塞上端面挡住前为止。在这一段时间内，由于柱塞的运动，燃油从油室被挤出，流向油道。所以这段升程称为预行程。当柱塞将油孔挡住时，便开始压油过程。柱塞上行，油室内油压急剧升高。当压力超过出油阀的弹簧弹力和上部油压时，就顶开出油阀，燃油压入油管送至喷油器。

柱塞套上的进油孔被柱塞上端面完全挡住的时刻称为理论供油始点。柱塞继续向上运动时，供油也一直继续着，压油过程持续到柱塞上的螺旋斜边让开柱塞套回油孔时为止，当油孔一被打开，高压油从油室经柱塞上的纵向槽和柱塞套上的回油孔流回泵体内的油道。此时柱塞套油室的油压迅速降低，出油阀在弹簧和高压油管中油压的作用下落回阀座，喷油器立即停止喷油。这时虽然柱塞仍继续上行，但供油已终止。 柱塞套上回油孔被柱塞斜边打开的时刻称为理论供油终点。在柱塞向上运动的整个过程中，只是中间一段行程才是压油过程，这一行程称为柱塞的有效行程。

力士乐REXROTH顶轴油泵A4VSO355DRG/30R-PPB13N00型号

A4VSO

A4VSO40DR

A4VSO40DR-10R-PPB13N00

A4VSO40DR-10R-PZB13N00

A4VSO40DRG

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A4VSO250OV

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AA4VSE250HZ

AA4VSE250HZ-10WX-VSM68B010

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高压油泵首要用途是作为千斤顶、镦头器、挤压机、扎花机等液压设备的动力源。高压油泵的设备次第如下：在设备高压油泵的过程中，为避免杂物落入机器内，机组的全部孔穴均应盖好。将机组放在埋有地脚螺栓的基础上，在底座与基础之间，用成对的楔垫用校正用。校正泵轴和电机轴的同心度，在联轴大道外圆上，容许差错0.1毫米;两联轴器平面的空地应保证2～4毫米，(小泵取小值)空地要均匀，允差0.3毫米。