Abstract: A fuel injection pump has an injection adjuster whose injection adjuster piston is acted upon on one face end by a restoring spring and by a pressure controlled by a control slide. On another face end the injection adjuster piston is exposed constantly to a pressure fluid source, which furnishes an rpm-dependent pressure. The control slide is adjusted positively by a control piston actuated by a control pressure, and in the process the control piston varies the pressure, acting the one face end, in a closed first pressure chamber. The injection adjuster piston is thus free of relatively high adjusting pressures acting on the injection adjuster piston transversely to a direction of motion.

Abstract: A fuel injection system with a fuel injection pump whose high-pressure delivery is determined by an electrically controlled valve that controls a discharge conduit. The phase of the high-pressure delivery is determined by the closing of the control valve. In order to carry out an injection that is divided into a pre-injection and a main injection, and in order to simplify the triggering of the electrically controlled valve, the cam driving the pump piston is formed so that the cam presents a region (P) in which the injection between a pre-injection and a main injection is interrupted. The pump piston remains in the position it has reached for pre-injection, moves backward, or continues to move slowly.

Abstract: A drive assembly comprises an elongated endless drive member, for example a roller drive chain, engaged on a rotary drive member, for example a drive sprocket, and arranged to be driven by the rotary drive member. A guide member, preferably a guide wheel defines a guide surface urged against the tight strand of drive chain on the opposite side to that engaged by the sprocket. The guide surface of the guide member is positioned in contact with the drive chain in the region of initial engagement of the drive chain on the drive sprocket and is arranged to guide the drive chain member on to the drive sprocket. The guide member is positioned for eliminating or inhibiting any radial component of velocity of the drive chain relative to the drive sprocket during engagement of the drive chain by the drive sprocket.