Optimizing integration in the vehicles' chassis
In order to integrate with a large number of existing vehicle platforms and those still in development, the Addidrive transmission is available in two system architectures, "central motor" and "in-wheel motor", with identical performance.
The pump, which is common to both formats, is installed at the gearbox output. It is directly driven by the differential ring gear at the average speed of the forward drive train.
The pump pressurizes the hydraulic motors as soon as there is a need for drive power.
"Central motor" architecture
A single motor in central position transmits torque to the two rear wheels through a mechanical differential and universal joints.
This powerful, optimized solution makes for maximum simplicity of the system.
"In-wheel motor" architecture
Two motors embedded in the rear wheels transmit their torque directly.
With this highly compact solution, the rear axle is kept very similar to the original axle.
Integration: the advantage of hydraulics
Compactness and hydraulic connections
Hydraulic components have a very high power density (30kW in a 5 inch diameter) and because power is sent through hydraulic pipes and hoses between the pump at the front of the vehicle and the motors at the rear, integration of the system is greatly simplified.
With no front/rear prop shaft needed for the transmission to function, there is very little impact on the vehicle chassis and therefore minimal need for adaptation.
As a direct result: Addidrive integration costs are a third for the manufacturer compared with a standard all-wheel drive option.