Abstract: A damper unit in which a structural volume of the unit is reduced. The hydraulic unit includes a damper chamber formed by a stepped bore. A diameter-to-length ratio of the chamber is between 1:3 and 1:12. A closure element of the damper chamber is received with radial pressure in the bore and is retained on the discharge end by an embossed connection. The smaller-diameter portion of the damper chamber bore, when the hydraulic unit is in the position for use, is offset eccentrically upward from the larger-diameter bore portion with an at least approximately horizontally extending bore axis, so that the jackets of both bore portion merge at least approximately in alignment with one another at at least one point. The damper chamber is of slender design and intended to be disposed in a housing block of the hydraulic unit in a way that economizes on installation space and is intended to be simple to vent. The hydraulic unit is intended for use in slip-controlled motor vehicle brake systems.

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: A pump unit with a drive motor mounted onto a pump block which reduces noise problems which stem from clearance fits that are required in order to be able to mount the drive motor onto the pump block. A pump unit set forth eliminates clearance fits required for the perfect assembly of the pump unit by means of plastic introduced into the clearance fits. The pump unit is particularly provided for slip-controlled vehicle brake systems in motor vehicles.

Abstract: The invention relates to a hydraulically actuated cutoff valve which is provided as an intake valve for switching between a master cylinder and an intake side of a feed pump of a slip-controlled vehicle brake system. The invention sets forth that the cutoff valve is embodied with a valve closing body that has a valve tappet which passes through an annular actuating element and is in engagement with a rocker element embodied as a cup spring, which rests on an annular pivot bearing. If the actuating element is acted upon by pressure, it presses down an outer edge of the rocker element, and as a result a middle of the actuating element executes a pivoting motion in the opposite direction that closes the cutoff valve. The invention has the advantage of an economical cutoff valve that has only a small number of components, and the invention can be used in a hydraulic vehicle brake system.

Abstract: The brake system has at least one brake circuit (I), in which a high-pressure pump is disposed. A self-aspirating charge pump is also provided, which is connected at least indirectly to the intake side of the high-pressure pump by an intake line of a supply container for brake fluid and by a pressure line. In the event of an inadequate supply of brake fluid by the charge pump, the pumping of air into the brake circuit (I) is intended to be precluded. To that end, a siphon is disposed in the intake line of the charge pump. Air aspirated by the siphon suddenly prevents pumping by the charge pump. The brake system is intended for use in motor vehicles with slip control or for automatic brakes.

Abstract: The invention relates to a piston pump for a slip-controlled hydraulic vehicle brake system. For a compact structure of the piston pump, an inlet valve and outlet valve in the form of check valves be disposed in a valve bore at a tangent to a cylinder bore of the piston pump in a pump housing. Aside from the advantage of a compact, space-saving design, the invention has the advantage of a small idle volume and thus good efficiency of the piston pump.

Abstract: A slip-controlled hydraulic vehicle brake system having brake lines that extend between a dual-circuit master cylinder and a respective wheel brake cylinder. A shutoff valve in the respective brake line. A bypass line that bypasses the respective shutoff valve. A pump in the respective bypass line for pumping pressure fluid, drawn from the associated wheel brake cylinder to the master cylinder. The pump (30) is also embodied to feed pressure fluid from the master cylinder to the wheel brake cylinder. The pump is a recirculating positive-displacement vane cell pump. The pump in the bypass lines has a common drive motor whose rotational direction can be reversed. The vehicle brake system is embodied for anti-lock and traction control operation at no additional expense for equipment.

Abstract: The invention relates to a piston pump for a slip-controlled hydraulic vehicle brake system. The piston pump has a piston which is driven to execute a stroke motion, and two check valves as an inlet valve and outlet valve for controlling the fluid flow through the piston pump. The outlet valve has a valve closing spring that effects a fast closure of the outlet valve. To enable completely evacuating a positive displacement chamber of the piston pump, the invention includes connecting an evacuation valve, embodied as a springless check valve with a small diameter and with a lightweight valve closing body, hydraulically parallel to the outlet valve.

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: A magnet valve having a rod-like base body for insertion into a stepped bore of a hydraulic block through which a valve tappet reaches a valve closing ball and on whose face end remote to an armature a cup-shaped sleeve is mounted. A valve seat of the magnet valve is embodied on the bottom of the cup-shaped sleeve. In order to make a large flow cross section available for a flow through the magnet valve in one flow direction, a check valve is integrated with the magnet valve and that to this end flow openings are disposed on an imaginary circle in the bottom of the cup-shaped sleeve. The openings are closed by an annular valve closing body of the check valve. The magnet valve of the invention is intended particularly for use as a brake pressure buildup valve for a wheel brake cylinder of a slip-controlled vehicle brake system.

Abstract: A piston pump for delivering hydraulic fluid for ABS brake systems having at least one pump piston. The pump piston is driven to execute an axial stroke motion and which, with a sliding face embodied on its circumference, slides against the inner wall of a guide bore in order to assure a favorable sliding friction between the pump piston and the guide bore for the purpose of noise reduction and to achieve longer service lives for the seal. Viewed in the longitudinal section of the pump piston, the slide face is embodied as wavy, wherein wave crests and wave troughs follow one another in succession in the longitudinal direction of the pump piston.

Abstract: The invention is based on a reciprocating piston pump having two radial pistons disposed symmetrically to one another, which are drivable to a reciprocating motion by an eccentric disposed between them and are held in contact with the eccentric by a hoop spring that engages the pistons. For ease of installation, the invention proposes embodying the hoop spring as a bent wire part, with two open, hooklike eyelets on their ends, which ends are inserted into annular grooves of the pistons and enter into a snap connection with them in order to hold the pistons tightly against the eccentric.

Abstract: The invention sets forth a hydraulic housing block with a downward-opening cavity which is covered by a protective cap. For ventilation of the cavity, the protective cap is arranged with a clearance relative to the hydraulic housing block. The protective cap is arranged in such a way that spray and dirt can not penetrate into the cavity through a gap between the protective cap and the hydraulic housing block. In order to prevent this penetration, the cap seals off the cavity by at least one encircling sealing lip and provides an opening at the lowest point on the circumference of the sealing lip to allow ventilation of the cavity.

Abstract: A hydraulic brake system that has a hydraulic unit for evacuation prior to initial filling, with the primary and secondary circuits dry, the brake system is equipped with special check valves, which are disposed between the primary circuit and the secondary circuit. When the brake system is evacuated, these check valves are in the open position, so that air escapes from the secondary circuits. This makes it unnecessary to open electromagnet valves, which are closed when without current and are present in the brake circuits I and II, electrically. The hydraulic brake system is intended for use in motor vehicles, and its hydraulic unit is designed to carry out anti-lock operation and/or traction controls.

Abstract: An electrohydraulic unit having a hydraulic block with integrated valves, chambers, pumps and conduits, and electromagnets for the valves that are held on the hydraulic block. An electric motor for the pumps and relays for controlling the electromagnets and the electric motor. Electromagnets and relays are covered by a cover with connecting connectors for making an electrical contact. To make the design simple to manufacture and assemble, the cover is subdivided into a connector base and a covering hood that can be attached thereto. The connector base overlaps the electromagnets and the covering hood overlaps the relays, which are inserted into two connector receptacles disposed on the connector base and secured against axial displacement by the covering hood. The electrical connection of the electromagnets to the connectors and relays is effected via a flexible contact foil and a stamped screen embedded in the connector base.

Abstract: A closure device, preferably made of plastic, serves for closing bags. It consists of a male section (1) and a female (2, 5 and 6), which are respectively joined to film (3 and 4) and may be detachably connected together. In order to ensure that such a closure device may be readily closed while at the same time being simple and cheap to produce, at least two spaced continuous projections (8) are provided on the side of the film (3) opposite to the male section (1). Similar projections (9) may advantageously be placed on the opposite side of the female section.

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: The invention relates to a check valve, for use as an insert check valve, with a valve seat and a valve element that is resiliently prestressed against the valve seat by a valve spring. According to the invention, a retaining element embodied as a retaining bracket is provided, which supports the end of the valve spring remote from the valve element and the retaining element can be locked resiliently to a recess, particularly an annular groove, of the valve housing. This enables fast, simple assembly of the check valve from its individual parts.

Abstract: This invention improves the capability of bleeding a chamber, disposed in the course of a line, that receives pressure fluid. On the pressure side of a high-pressure pump that pumps pressure fluid through a line, a chamber of circular-cylindrical cross section is disposed in its course. Two line segments of the line discharge into the upper face end of the chamber. A guide body disposed coaxially with the longitudinal axis of the chamber is received in the chamber in the region of this face end. The guide body embodied substantially in the form of a circular disk, defines an annular gap toward the inside circumference of the chamber and a subchamber of the chamber toward the face end of the chamber. The guide body directs air located in the chamber into the subchamber, from which it is carried away by the flow of pressure fluid. The hydraulic brake system is especially suitable for motor vehicles.

Abstract: In a pump having a piston, supported displaceably in a pump cylinder, for aspirating a pressure fluid via a feed line and for expelling this pressure fluid into a line, particularly a brake line, the pump cylinder is intended to rest with a stop ring on a shoulder of the housing. This housing shoulder is adjoined by an annular chamber having a filter, which toward the housing forms an annular gap into which the feed line for pressure fluid discharges. The pump cylinder stop ring is intended to include a radius of curvature and to rest on the housing shoulder, also having a radius of curvature in the region of a bearing face.