Abstract: In a running wheel for track vehicles comprising two discs (1) which leave free a guide gap (11) for the chain teeth (10) and which terminate in a cylindrical region (2) with rubber coating (3) disposed at the outer periphery, to reduce the material stresses in each case in the transition between cylindrical region (2) and disc (1) due to the introduced forces at the open end of the cylindrical region (2) with constant wall thickness, in the third of the cylindrical region (2) remote from each disc (1) an inwardly directed peripheral bead (4) is disposed.

Abstract: A road wheel for a track-laying vehicle is composed of two wheel halves, each of which is deep drawn and pressed from a steel disk. The wheel halves have cylindrical and hub portions bridged by conical portions of different projection angles dimensioned so that the wheel half is of light weight, resistant to attack and of high strength.

Abstract: A valve-controlled internal combustion engine has the amount of twist in the combustion air flowing through a curved inlet channel to a valve chamber controlled by a control rod extending across the bottom wall of the inlet channel near the valve chamber and rotatable from outside the engine to change the cross sectional dimensions of the inlet channel and increase or decrease the twist in the flow of combustion air therepast.