The hydraulic motor-pump group is a solution not detailed in our catalogs, but it has long been available at Vivoil. It consists of a motor coupled to a hydraulic pump, with the motor’s output shaft already connected to the pump shaft.
It can be used to recover the residual energy in a fluid and transfer it to a parallel circuit.
By appropriately selecting the displacements of the different components, it is possible to manage the capacity of the second circuit, increasing either the flow rate or the pressure.
Variants of the Vivoil motor-pump group
As of today, the motor-pump group is available for motors belonging to group 1 and group 2, and it is still undergoing testing for group 0 and group 3.
At the moment, there are no plans to create similar solutions using different dimensional groups, for example assembling a Group 2 motor with a Group 1 pump. However, it is possible to configure both the motor and the pump to operate in either unidirectional or reversible versions.
In the first case, the unidirectional motor and unidirectional pump operate in a single direction only. In the second case, the reversible motor and reversible pump operate in both directions of rotation.
In the reversible motor-pump group configuration, a drain port is provided on each of the two covers, both on the pump cover and on the motor cover.
The Vivoil motor-pump group also features a small hole in the central connection plate. This is a port that serves as a hydraulic indicator, as any oil leakage from this hole signals that one of the two shaft seals has failed.
This feature makes it possible to prevent oil contamination in case the two circuits use different types of oil.
A system that helps you recover energy
The motor-pump group allows you to recover energy, reducing waste.
The residual power in the pressurized oil is sent to the motor, which drives the shaft and in turn activates the pump, drawing in oil and pressurizing it.
These systems offer a total efficiency of around 70%, depending on the efficiency of the two components. Nonetheless, they are valuable because they make use of residual energy that is typically lost.
Want to know more about the motor-pump group?
Contact us, we’ll be happy to answer all your questions.