Abstract: The invention relates to a piston pump for a hydraulic, slip-controlled vehicle brake system. The piston pump has a piston, which is inserted with a part of its length into a sleeve. A tubular filter that encompasses the piston is attached to the sleeve and constitutes a captive retainer, which secures the piston in a captive fashion in the sleeve. In order to reduce an axial mobility of a sealing ring that seals the piston in the pump housing, the invention proposes attaching the filter, which limits the axial mobility of the sealing ring, to the sleeve in an axially mobile fashion.

Abstract: The invention relates to a piston pump (10) for a hydraulic, slip-controlled vehicle brake system. The piston pump (10) has a piston (20), which is inserted with a part of its length into a sleeve (12). A tubular filter (76) that encompasses the piston (20) is attached to the sleeve (12) and constitutes a captive retainer, which secures the piston (20) in a captive fashion in the sleeve (12). In order to reduce an axial mobility of a sealing ring (14) that seals the piston (20) in the pump housing (16), the invention proposes attaching the filter (76), which limits the axial mobility of the sealing ring (24), to the sleeve (12) in an axially mobile fashion.

Abstract: The invention relates to a piston pump for a slip-controlled hydraulic vehicle brake system. To make a piston of the piston pump easy and inexpensive to manufacture, the invention proposes that the piston be comprised of a sleeve-like shaped part and a valve seat part that is made of plastic and is press-fitted into the shaped part. A high-pressure-side sealing lip is formed onto the valve seat part and is of one piece with it. By means of a tubular support body, a restoring spring is supported on the valve seat part spaced apart from a valve seat of the valve seat part and spaced apart from the sealing lip, which prevents the valve seat and the sealing lip from being impaired by the force of the restoring spring.

Abstract: The invention relates to a check valve for a piston pump of a hydraulic traction-controlled vehicle brake system. The check valve is embodied in one piece as a helical spring with a closure disk on one face end of the helical spring and a base ring for fastening the check valve on another face end of the helical spring, and that the check valve be produced as a plastic injection-molded part.

Abstract: A piston pump for a slip-controlled hydraulic brake system for a vehicle. A tubular filter is mounted on a bush of the piston pump; the filter has a filter ring that forms a guide ring and is spaced apart from the bush and axially guides the piston by a part of the piston that protrudes from the bush. A separate guide ring is dispensed with, and the structural length of the piston pump can be shortened.