Created on:2021-04-24 09:07

Disassembly and assembly of gear pump and gear motor

Disassembly and assembly of gear pump and gear motor

After the gear pump is used for a certain period of time, the end face, addendum circle and tooth profile of the gear may be worn and scratched, causing leakage and noise increase. If the wear and tear is serious, it needs to be disassembled for maintenance. The disassembly and assembly method of gear motor is similar to that of gear pump.

(1) Disassembly when overhauling the gear pump, the pump should be disassembled according to the assembly drawing or operation manual of the pump according to the steps listed in the following table.

 

General disassembly procedure of three piece gear pump

step

内 容

 

步骤

内 容

1

拧松并卸下泵盖及轴承端盖上的链接螺钉

5

取下浮动侧板及密封圈

2

卸下定位销及泵盖和轴承盖

6

检查轴端骨架油封,若阻油唇边良好则能继续使用,不必取出;反之,则应取出更换

3

从泵的壳体内取出传动轴及轴套

7

用煤油或柴油清洗拆下来的零件

4

从泵的壳体内取出两个齿轮

8

逐一检查拆下零件的状态并将已磨损和刮伤的零件挑出送去修理

 

(2) Repair

① When the end face of the gear is slightly worn, the two gears can be rubbed and polished on the abrasive cloth at the same time. When the wear is serious, the two gears can be ground on the surface grinder at the same time, and then polished with metallographic sandpaper, but the pump body should also be ground to the same size. After repair, the thickness difference between the two gears should not be greater than 0.005mm, the perpendicularity between the gear end face and the hole, and the parallelism between the two gear axes should not be greater than 0.005mm.

② The wear of the pump body is mainly the contact surface between the inner cavity and the gear tooth top circle, and mostly occurs on the oil suction side. In case of slight wear, remove the burr with fine emery cloth and continue to use.

③ For tooth profile wear or strain caused by tooth meshing, fine abrasive cloth or oilstone can be used to remove the strain or the burr that has been grinded into polygon.

④ Side plate or end cover repair side plate or front and back cover mainly refers to the wear and strain of the contact end face sliding relative to the gear after assembly. In case of slight wear and strain, the end face can be grinded for repair; in case of serious wear and strain, the groove mark on the end face can be grinded on the surface grinder.

⑤ The main failure mode of the pump shaft repairing gear pump is that the contact part with the needle roller bearing is easy to wear and sometimes break. When it is slightly worn, it can be polished and repaired, and the needle roller bearing can be replaced.

(3) The assembly steps of gear pump are shown in the table below.

 

Assembly procedure of gear pump

步骤

内 容

 

步骤

内 容

1

用煤油或轻柴油清洗全部零件

6

将轴套副与前、后泵盖组装

2

在更换的骨架油封周边涂润滑油,用适合的芯轴和小锤轻轻打入主动轴轴头盖板槽内,油封的唇口应向内,不得装反

7

将定位销装入定位孔中,轻轻击打到位

3

将各密封圈洗净后装入其油封槽内

8

将主动轴装入主动齿轮花键孔中,同时将轴承盖装上

4

将合格的轴承涂润滑油装入相应轴承孔内

9

安装连接量泵盖及课题的紧固螺钉,所有螺钉拧紧后,应达到旋转均匀的要求

5

将轴套与主动、被动齿轮组装成齿轮轴套副,在运动表面加润滑油

10

用塑料封好油口

 

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