90 Degree Gear - Ringgearpinions

90 Degree Gear. The gearbox used in this vehicle is 90 degree with a difference of 3.2:1, which is the ratio between the input and output shafts. A 90 degree gearbox, called a Hypoid gearbox, is commonly used in rear-wheel drive applications because of its high torque efficiency and low mechanical loss.

90 degree is the rotation of the wheelchair around its front wheel at the end of a 180-degree rotation. In full-circle turns, the wheelchair will describe a circle on the ground a complete revolution. In half-circle turns, the wheelchair will describe half a revolution on the ground, to reduce the number of moving parts and the amount of mechanical linkage and make the best use of space.