Vision offers a variety of parts for use in gear pumps and metering pumps suitable for a variety of applications.
This page will introduce you to gear pumps, applications that use gear pumps, and the use of Powder Metal for producing pump gears.
An Introduction to Gear Pumps
Gear pumps are a type of pump used to transfer liquids from one location to another. They are a positive displacement pump, meaning they provide a fixed flow rate regardless of pressure changes within the system.
There are two types of gear pumps – external gear pumps and internal gear pumps. External gear pumps make use of two external opposing gears (typically spur gears) in transferring the fluid type. Internal gear pumps use one outer ring gear and one internal pinion gear running inside the ring gear. In either type, the gears are contained within a pump housing or body.
External gear pumps consist of these main components:
- Driving gear
- Driven (idler) gear
- Pump housing
- End plates
- Side plates
How a Gear Pump Works
It’s sort of like a crowd of people walking through a set of revolving doors.
The gear pump is operated by some type of motor that connects to a rotating shaft which is attached to the driving gear. The motor is responsible for turning the driving gear, which in turn drives the driven (idler) gear.
Where you will see gear pumps
They are very commonly used in lubrication pumps for power transmissions in automobiles, heavy trucks, lawn care equipment, hydraulic lifts, and other machine tools. Your car’s oil pump is likely a gear pump.
Gear pumps are excellent as metering pumps since they can control volume and flow rate of a variety of fluids. For example, chemical additive metering is one duty.
Choose powder metal for your gear pump needs
If you need precision pump gears, powder metal is a superb choice.
How does a powder metal pump gear compare with a machined from bar pump gear?
In most applications you will not notice any difference in the pump performance when using a fully machined pump gear or one produced as a powder metal component.
Both are made to extremely close finished tolerances, both are normally heat treated for long pump life, and both are made to the Customer’s print specification and of very high quality. The one difference you may find between the two is that in many cases, especially those gears having an ID keyway or similar ID form, the powder metal pump gear will be lower priced as many machining operations are eliminated.
Gear designers and product engineers find they have a much greater opportunity for optimum and consistent flow rate, increased tooth strength, and pump operational noise reduction using PM pump and metering gears instead of gears that have been hobbed.