Abstract: The invention relates to a pressure accumulator, especially for a hydraulic unit of a hydraulic vehicle braking system with electronic wheel slip regulation. Pressure accumulators having an accumulator piston acted on by a piston spring are known according to prior art. In order to save costs on parts for the piston spring and to save space in terms of the pressure accumulator, a piston spring having at least one first spring winding is used. According to the invention, the outer diameter of the first winding is smaller than the inner diameter of a second spring winding connected thereto.

Abstract: A pump unit for a hydraulic vehicle brake system with traction control has an electric motor driving a radial piston pump. A rotor shaft of the pump unit has a hollow shaft with two standardized, hardened cylindrical pins that are press-fitted into the ends of the hollow shaft. The rotor shaft can be produced simply, economically, and without metal-cutting machining. The hollow shaft has high bending and torsional strength. The rotor shaft has a small diameter at the bearing points, which makes a small bearing diameter and thus a small installation space for the pump unit possible.

Abstract: The invention relates to a pump unit (10) for a hydraulic vehicle brake system with traction control. The pump unit (10) has an electric motor (12) and a radial piston pump (14), which can be driven by the electric motor (12). The invention proposes embodying a rotor shaft (18) of the pump unit (10) with a hollow shaft (20) and with two standardized, hardened cylindrical pins (22, 24) that are press-fitted into the ends of the hollow shaft (20). The invention has the advantage that the rotor shaft (18) can be produced simply, economically, and without metal-cutting machining. Because of its embodiment as a hollow shaft (20), the rotor shaft (18) has high bending and torsional strength. Because of the press-fitted pins (22, 24), the rotor shaft (18) has a small diameter at the bearing points, which makes a small bearing diameter and thus a small installation space for the pump unit (10) possible.

Abstract: A piston pump intended especially for use in a slip-controlled hydraulic vehicle brake system. The piston pump is inserted into a cylinder bore, the piston pump has a piston, a bush, and a closure element that tightly closes the cylinder bore. The closure element is joined radially movably to the bush, for instance via caulking. This joint has the advantage that the piston pump can be assembled into a compact, easily manipulated, and sturdy component unit, and that the closure element and the bush are aligned with one another on being inserted into the cylinder bore.

Abstract: The invention is directed to a piston pump for a hydraulic vehicle brake system. For simple and inexpensive manufacturability, the piston pump embodies an outlet conduit as a groove in a sleeve bottom and a sealing part. As a result, the sleeve and the sealing part can be manufactured in a non-cutting manner by means of forming. Another advantage of letting the outflow conduit into the sleeve bottom is that the outlet conduit is disposed a small distance in the axial direction from a valve seat of an outlet valve, which counteracts noise production.

Abstract: A piston pump which is intended for use in a vehicle for a hydraulic, slip-controlled braking system. To enable producing the piston pump inexpensively, a bush is made without undercuts as an upset part integrally with a bottom which has a valve seat for the outlet valve of the piston pump.

Abstract: A piston pump for a hydraulic brake system for a vehicle with a slip control system. For economical production, the piston pump includes a piston as a composites part with a core of steel that is surrounded by a lubricant jacket of plastic. By way of example, the lubricant jacket is applied to the core by spray-coating, or is pressed onto the core or slipped onto the core. The lubricant jacket economizes by dispensing with expensive post-machining of the piston surface by grinding, for instance, and improves the sliding properties of the piston.

Abstract: A piston pump which is intended in particular for a vehicle hydraulic, slip-controlled brake system. To reduce idle volume in the piston pump, a positive-displacement body is mounted on the piston by means of a retaining part. The displacement body protrudes into an interior of a valve closing spring, embodied as a helical spring, of an inlet valve integrated with the piston. The embodiment of the valve closing spring and of a piston restoring spring with a rectangular coil cross section also contributes to reducing the idle volume of the piston pump. Reducing the idle volume increases the efficiency of the piston pump.

Abstract: The invention relates to a piston pump having a piston that is axially displaceable in a bush. In order to keep the piston in the bush in a manner secured against loss, a tubular filter is secured to the bush in the extension thereof; the filter has a smaller inside diameter than the bush and in this way keeps the piston in the bush.

Abstract: In a piston with an encompassing seal, which is seated slidably in a cylindrical receiving bore of a structural part such as a housing block and which can be acted upon by pressure on at least one end, the piston is intended to have a shoulder for receiving the seal. This shoulder divides a cylindrical running face of the piston of a segment having a jacket face, and a groove is formed into the jacket face for receiving a ring that secures the seal in the axial direction and also acts as a stripper ring protecting the sealing ring.

Abstract: A pressure fluid reservoir is made from two housing components, that are brought together with an outer and inner thread arrangement with end stops formed by adjacent ends of the two housing components. The first housing component of the pressure fluid reservoir includes two segments and the second housing component includes two guide faces with an inner thread and an outer thread located between them. The guide faces are disposed with such a length and such a spacing with respect to one another that prior to the threads being screwed together during assembly, the threads are sealed off from the reservoir chambers and two stop faces facing one another on the housing components come into contact on their ends once the screwing operation is completed. The ends are exposed to the outside so that the contact between the ends can be seen from the outside.