Robert Boschgmbh

Ernst-Dieter Schafer

Georg Kehl

Heinz Siegel

Edgar Schmitt

Robert Mergenthaler

Hannes Bertling

Arnold Pahl

Dietmar Rischen

Andreas Abbing

George Kehl

A brake booster in which a servo piston is slidably supported in a housing. The transmission of a brake force is effected via a piston rod protruding into the housing, and a work chamber is formed between the piston rod and the servo piston. After the opening of a valve, this work chamber can be filled with brake fluid from a reservoir or supply container via a pump or the like. A return line also leads out of the work chamber back to the supply container, via a further valve. To improve the closing or sealing behavior of the valves, the first valve is to be embodied for admitting the brake fluid from a valve cone, or its shoulder, the valve cone extending axially in a blind bore of the servo piston, and a valve seat formed out of a valve bushing. The second valve is likewise embodied as a seat valve, and an element connected with the valve cone cooperates with an element connected with the piston rod.

Brake booster

The invention relates to a brake pressure control valve which contains a brake pressure build-up valve. The brake pressure build-up valve comprises a pressure compensated seat valve. A second valve member, a rod between the two valve members and a tubular compensating piston are provided to produce pressure compensation at the valve member. The compensating piston which encloses the rod is displaceable relative to the latter and comprises a second valve seat at its end directed towards the second valve member. A sealing ring also encloses the tubular compensating piston. When the first valve member is raised from its valve seat, the second valve member can precede the tubular compensating piston, thereby preventing friction forces between this compensating piston and its sealing ring from being disruptive during opening of the seat valve. Also provided is a valve slide which only uncovers flow bores when the seat valve is opened for the purpose of increasing brake pressure. Brake pressures can be smoothly controlled by means of the control slide.

Brake pressure control valve

A lightweight ball-and-socket joint that is for instance capable of being assembled by a robot. The ball-and-socket joint has a ball head, a CIRCLIP and an outer structural part forming a socket, in which there is a circumferential groove the bottom of which forms a support face for the circlip. The support face is substantially defined by a hollow cone and surrounds the CIRCLIP like a jacket, and a flare angle of the support face opens toward the center of the ball head. The CIRCLIP presses with radial bias against the support face and therefore migrates in the direction of its largest diameter and hence toward the center of the ball head until it rests thereon.

Ball-and-socket joint

A self-securing ball-and-socket joint which has a ball head integrally formed on a rod, an outer structural part having a bore that pivotably receives the ball head and a radially elastic CIRCLIP brand retaining ring as well as a separate auxiliary assembly tool for the retaining ring. In the outer structural part beside the center of the ball head, there is a circumferential groove having a support face for the retaining ring. When the ball-and-socket joint is assembled, the retaining ring is first inserted into the circumferential groove. Then the auxiliary assembly tool is inserted into the bore. At its initial end the auxiliary assembly tool is embodied in the manner of a centering and expansion tool, so that it aligns the retaining ring with respect to the circumferential groove and finally forces it into this groove. Upon further displacement of the auxiliary assembly tool, the retaining ring snaps home into a detent notch provided on the circumference of the auxiliary assembly tool. As a result, the retaining ring is prevented from falling out of the outer structural part. For final assembly of the ball-and-socket joint, all that remains to be done is to insert the ball head in the course of which the auxiliary assembly tool moves away from the CIRCLIP retaining ring and the CIRCLIP retaining ring finally snaps home into its securing position in the groove in the rod outwardly of the ball head.

Ball-and-socket joint assembly tool and method

A ball joint that cannot be disassembled intended for use in a brake booster. The ball joint comprises a first, substantially rod-like component, which has a ball head; a second component, which has an insertion opening, which narrows in funnel-like fashion in the area of its beginning and is provided with an annular groove spaced apart from the beginning, a radially elastic securing ring, which is insertable into the insertion opening and lockable into place in the annular groove, as well as a sleeve, which has an annular groove for receiving the securing ring during the insertion into the insertion opening until it locks into place in the detent provided by the annular groove of the outer component. The sleeve surrounds the ball head in an articulated and undetachable manner.

Growing community of inventors

Pliezhausen, Germany

Ernst-Dieter Schafer