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✔ How does a crescent type pump works.

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A crescent type pump is commonly used in automobiles for which are of automatic transmission type, widely used in construction equipment backhoe loader machines in its transmission (gear box).

This is a type of gear pump.

 

 

Video explaining the working of a Crescent type pump.


Where is crescent type pump fixed?

As shown in the above fig:1 the crescent type pump is fixed between the torque converter and the gear box in a BHL machine.

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Fig: 1 – Position of crescent pump.

Functions of the crescent type pump:
To supply the flow of required fluid to the gear box to maintain the pressure for its smooth working and also to circulate the fluid in the torque converter to the gearbox.

Main components of the pump:
The crescent type pump consists of mainly three components.
1. Casing.
2. Internal gears (driving gear).
3. External gears (driven gear).

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Fig: 2

• Casing: It comprises of two sections as listed below.
1. Casing with crescent: This part of the casing is to which crescent is fixed as shown in the fig: 2, both the external and internal gears rest’s inside this portion as shown in fig:2, this section of the casing is fixed towards the torque converter.
2. Casing with inlet and outlet port: This is the rear part of the crescent pump which is fixed towards the transmission or gearbox as shown in fig:3. This is the portion where the inlet and outlet ports are coming.
• Internal gears (driving gear): This is the smaller gear which takes the drive from the torque converter and drives the external gear, hence called driving gear (engine drive reached the torque converter and it is connected to the internal gears of the crescent pump).
• External gears (driven gear): This is the gear as shown in the fig.2, this is called driven gear as it is been driven by the drive coming from the Internal gear (driving gear).

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Fig: 3

Working of crescent pump or charging pump:
As you are now familiar with the components of the crescent pump let’s see how it works, the rear portion of the torque converter is connected the crescent pump. The docks protruding from the rear part of the torque converter as shown in the video are connected towards the internal gear of the crescent pump. So the drive coming from the engine which is rotating the torque converter reflects on the internal gears of the pump. As the teeth’s of the internal gears are engaged with the external gears of the pump (so it’s called driven gear). So as shown in the video when we watch from the rear of the pump we can see that the gears are rotating in the anti-clock wise direction. The portion where the teeth’s of the gears are disengaging a low pressure is created, so fluid is sucked at the region (inlet) and the area where the teeth’s engage pull the fluid out (out put).

As shown in the above figure the smaller port is the outlet and the larger port is the inlet. The function of the crescent pump (charging pump) is to supply adequate amount of fluid flow to the gear pump, it sucks the oil from the transmission strainer and supplies to the transmission filter for circulation in the gear box for the working of the transmission units.

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