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Fig. 2
IntPump

Internal Gear Pumps

Internal gear pumps are not gear pumps that go inside machinery. They are pumps with a ring gear and an internal gear that revolves around inside this ring gear. So the fluid is contained internally between the ring gear and the driven gear. There are two types of internal gear pump. The normal spur gear type, shown in Figure 2, and the gerotor type pump which uses a different type of gears.

Internal Spur Gear Pump

Figure 1 shows the inside view of a typical internal gear pump. The pump shaft drives gear (1) in the direction of the arrows. The teeth on gear (1) mesh with and turn ring gear (2). As the gears unmesh at the bottom, the area in the suction chamber gets bigger. This causes a slight vacuum in the chamber which allows atmospheric pressure acting on the fluid in the tank to push more fluid into the pump via port (4). As the gears turn they form a seal against the sickle shaped segment (6) which traps the fluid between the teeth. The teeth then carry the fluid toward the pressure port (5) and as they re-mesh again they force the fluid under pressure into port (5). Remember, at Central Qld Hydraulics, we take any old pumps and motors that are preserved well, replace their damaged parts to make them go on doing their outstanding work as new pumps and motors.
Fig. 1
Suction Pressure Internalgearpump
1
2
3
4
5
6

A description of how internal gear pumps works

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Oil drop Internal gear pump IGP 2 pump NYP series pump Genpur pump

CENTRAL QUEENSLAND HYDRAULICS

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page back
Home Products Filtration Service & Repairs Hire Distributorships Quality & Safety Profile Contact Us headerline
Fig. 2
IntPump

Internal Gear Pumps

Internal gear pumps are not gear pumps that go inside machinery. They are pumps with a ring gear and an internal gear that revolves around inside this ring gear. So the fluid is contained internally between the ring gear and the driven gear. There are two types of internal gear pump. The normal spur gear type, shown in Figure 2, and the gerotor type pump which uses a different type of gears.

Internal Spur Gear Pump

Figure 1 shows the inside view of a typical internal gear pump. The pump shaft drives gear (1) in the direction of the arrows. The teeth on gear (1) mesh with and turn ring gear (2). As the gears unmesh at the bottom, the area in the suction chamber gets bigger. This causes a slight vacuum in the chamber which allows atmospheric pressure acting on the fluid in the tank to push more fluid into the pump via port (4). As the gears turn they form a seal against the sickle shaped segment (6) which traps the fluid between the teeth. The teeth then carry the fluid toward the pressure port (5) and as they re-mesh again they force the fluid under pressure into port (5). Remember, at Central Qld Hydraulics, we take any old pumps and motors that are preserved well, replace their damaged parts to make them go on doing their outstanding work as new pumps and motors.
Fig. 1
Suction Pressure Internalgearpump
1
2
3
4
5
6

A description of how internal gear pumps works

Flare
Copyright © 2013, Central Queensland Hydraulics Pty.Ltd. - Contact our Webmaster
Oil drop Internal gear pump IGP 2 pump NYP series pump Genpur pump