The thesis work is based on the drivetrain platform developed during the student project SIRIUS. After last year’s students were finished, there still was not yet a proper lubrication system introduced, which is what this thesis work was then decided to continue with. 

Firstly, the work began with research of relevant literature after which it transitioned into a product development process inspired by Karl T. Ulrich and Steven D. Eppingers product development theory. The work included product specification, system-level design and concept development. 

Calculations were conducted in order to decide suitable radiators and radiator fans for the cooling system, as well as a heat exchanger for the lubrication system, with regards to the cooling requirements. Furthermore, a MATLAB script was developed to estimate the pressure drops in the lubrications system, an essential part of the construction and design work. 

Finally, the thesis work resulted in two concepts which were then further developed. One of which, a mechanically driven oil pump connected via a power take-out (PTO) to the planet carrier of the first planetary gear set of the gearbox. The concept showed its strength with a linear ratio between the oil flow and the power going through the drivetrain. The negative aspect of this concept showed to be the low-pressure side of the pump, where the oil has to travel a considerable length until it reaches the pump. This was the reason behind the development of the second concept, a vehicle speed proportional mechanically driven oil pump located at the bottom of the drivetrain, just above the oil level. The analysis came to show the second concept had a higher probability to succeed ones building and testing it. 

The thesis work resulted in calculation models in MATLAB and Excel, 3D-models in Catia and a master thesis summarizing the project.