Land Vehicles with Hybrid Transmission

 

It is possible to adjust existing design of land vehicles to make them driven not with mechanical transmission and drive-train, but with purely hydraulic transmission or with a hybrid transmission a combination of hydraulic and mechanical power transmissions.

 

Tractors and Alike

When axes of powered wheels, or powered gears, driving the tracks of a vehicle, do not move relatively to the body of the vehicle, like in a tractor with large wheels, or in a tracked tractor, it is possible to have a dedicated hydraulic motor, driving each such wheel or gear.

 

Driving Suspended Wheel Pairs

Traditionally, rotation from a motor is transmitted to a pair of suspended powered wheels through following mechanical drive-train:

wheel

half-axel

u-joint drive-shaft u-joint gear-box

half-axel

wheel

U-joints provide flexibility of drive-train movement along the body of the vehicle, and the gear-box, which contains differential, works together with two half-axels as one inflexible axel.

It is possible to modify this power transmission subsystem and drive each wheal with a dedicated hydraulic motor (there is no need for a differential in such case). We would need two drive-shafts and two gear-boxes, each drive-shaft passing rotation to its gear-box from a dedicated hydraulic motor. In turn, rotation from a drive-shaft is passed to only one wheel, through a connected half-axel. To make devices between two wheels rigid, we need to rigidly connect two gear-boxes:

 

wheel

half-axel

u-joint drive-shaft u-joint gear-box

connector

u-joint drive-shaft u-joint gear-box

half-axel

wheel

When all wheels are powered and driven with this kind of power transmission, turning of the vehicle could be done with rotating of wheels on one side of the vehicle faster than wheels on the other side. In this case, there is no need for special wheels, guiding the turning of the vehicle.

Hence, when one deploys this kind of Hybrid Transmission, it makes sense to have all wheels powered.

Alexander Liss 8/18/2019