Abstract: In a connecting rod with a split big-end, the unmachined part is preferably aluminum die-casting in which notches are made along the subsequent line of separation. The big-end is separated substantially along the intended break line by means of a shearing tool capable of widening the eye in the region of intended bore reliefs in such a way that subsequent opening out is unnecessary.

Abstract: A valve plate for a piston compressor, in particular for air compression in motor vehicles, consists of two mutually facing and connected plate halves, each of which is made of a diecast material such that the valve plate consists of two diecast plates. The two diecast plates are joined together by coating or gluing, the sealant in the sealing gap between the two diecast plates being protected against thermal effects in the region of the pressure apertures by protective bodies (sleeves, steel rivets) that can be inserted in the pressure apertures.

Abstract: In a piston-type compressor, especially for generating compressed air in motor vehicles, there is a suction plate on the underside of a valve support, clamped between the cylinder and cylinder head, facing the compressor piston. The suction plate consists of an active and an inactive section. The active section, preferably consisting of a tongue-shaped active plate fitted in the center, operates in relation to suction apertures in the valve support while the inactive section of the suction plate has at least one delivery aperture in active connection with at least one delivery aperture in the valve support. The suction plate takes the form of a disc, thus virtually eliminating waste space. The suction plate can be fitted between the cylinder and the valve support without additional components; when used in an energy-saving system, the suction plate can be rotated to produce differing degrees of overlap between suction and delivery apertures.