Axial piston pump
An axial piston pump is a device used in hydraulics to convert mechanical into hydraulic energy. Axial piston pumps are used both in industrial applications (e.g. heavy machine construction, plastics machine construction) and in mobile machines. A distinction is made between bent axis and swash plate pumps . They can have a constant or variable delivery volume and delivery direction.
They are used in hydrostatic transmissions in vehicles. Power ( speed and torque ) is transmitted via oil pressure (maximum approx. 400–500 bar). The oil flow is infinitely variable, resulting in a continuously variable transmission with a very high power density. Typical areas of application are excavators, wheel loaders, increasingly tractors, snow groomers, combine harvesters and many other slow drivers.
In comparison with a torque converter , the various hydraulic principles become apparent:
- In the hydrodynamic converter, a torque is generated at the output via the oil flow.
- In the hydrostatic transmission, a torque is generated at the output via the oil pressure.
The pistons are supported axially in ball socket bearings and take the drum with them radially.
Properties of bent axis pumps:
- self-priming and easy to approach
- insensitive to dirt
- suitable for changing pressure loads
- tend to vibrate when accelerating and decelerating
- Volume flow can be adjusted
- cannot be adjusted quickly
- Axial piston pump drawings
Side view with lettering
3D render with lettering
animation
- Axial piston pump of a metal cutting machine
See also
Web links
- Animation ( memento of November 17, 2008 in the Internet Archive ) with description in English