Abstract: A change-speed maneuvering apparatus in a vehicle provided with a steering-wheel apparatus including a generally upright steering-wheel post, has a main change-speed maneuvering shaft assembly on one lateral side of the steering-wheel post, in parallel to it. On the other lateral side of the steering-wheel post, there is, also in parallel to it, a forward-and-rearward running-travel shiftover actuation shaft, and there also are interlocking levers which are pivotally supported on the forward-and-rearward running-travel shiftover shaft and which function to operatively connect the main change-speed maneuvering shaft to the drive power transmission mechanism.

Abstract: A system for maneuvering steerable running wheels of a vehicle by means of a steering wheel via gear case equipped with input and output shafts and a gearing mechanism operatively interconnecting these shafts. On the vehicle, the output shaft is disposed outer than the input shaft, and the gearing mechanism is constructed with helical gears fitted respectively on the input and output shafts.

Abstract: Disk brake apparatus mounted on a differential gear shaft extending from each side wall of a transmission case. A cam plate and balls coact to press a brake disk mounted on the differential gear shaft against a friction surface. Each of the balls is in direct or indirect point-to-point contact with the outer side wall of the transmission case to reduce the sliding resistance involved.

Abstract: Construction for uniting by welding a brake case cover, a rear wheel axle case and a terminal speed reduction unit case which are all made of sheet metal. The rear wheel axle case has at its opposite ends precisely circular tubular portions fitting in the brake case cover and in the terminal speed reduction unit case to connect them together. The united parts are joined together by automatic welding. The rear wheel axle case has a flat tubular intermediate portion for mounting a fender or the like thereon. The flat tubular portion has a smaller sectional area than the opposite end tubular portions so as to be substantially flexible and to thereby absorb concentric loads on the weld joints.