Abstract: A master cylinder for a controlled brake system, including at least one piston which is displaceable in a housing and is sealed with respect to a pressure chamber by a sealing element arranged in an annular groove of the housing, which pressure chamber is connectable to an unpressurized supply chamber by control passages formed in the piston. The piston 46 is formed in at least two parts, including a main body and an annular control element, the control passages being provided in the control element.

Abstract: A master cylinder for a regulated braking system having at least one piston, which is movable in a housing and which is sealed from a pressure chamber by a sealing element arranged in a ring groove of the housing, which can be connected to an unpressurized supply chamber by control passages designed in the pistons. In order to reduce the flow resistance of the control passages at the same dead stroke, the control passages have a control edge designed parallel to a piston end face of at least one of the pistons.

Abstract: A master cylinder 1, especially for a controlled brake system, includes at least one piston 3, 4; 53, 54 displaceable in a housing 2, which is sealed in relation to a pressure chamber 7, 8 by means of a sealing element 5, 6 arranged in an annular groove 23, 24 of the housing 2, said pressure chamber being connectable to an unpressurized supply chamber 11, 12 by means of transverse bores 9, 10; 50, 51 provided in the piston 3, 4; 53, 54. Several recesses 15, 16, 17 are arranged on an inside surface 13, 14; 59, 60 of the piston 3, 4; 53, 54 into which the transverse bores 9, 10; 50, 51 open.

Abstract: A tandem-type pneumatic brake booster, in particular for hydraulic vehicle brake systems, having a housing comprising a first and a second housing half shell, the interior of which is divided with the aid of a partition into a front and a rear booster chamber, wherein the partition has a centrally arranged, circular cavity, through which a control housing or a cylindrical control housing extension extends, and the partition rests sealingly against the control housing or the control housing extension by a sealing element, having a first and a second movable wall, which respectively subdivide the front and the rear booster chamber into a first low-pressure chamber and a first working chamber and into a second low-pressure chamber and a second working chamber, having at least one connecting conduit between the first working chamber and the second working chamber in order to equalize the pressure between said two working chambers.

Abstract: The present invention relates to sulphur-crosslinked hydrogenated vinylpolybutadienes which serve for production of technical rubber items and of tyre components and have very good recovery performance over a wide temperature range.

Abstract: The present invention relates to layered-structure vulcanizates, where at least one of the layers is composed of a hydrogenated vinylpolybutadiene and the other layers are preferably composed of rubbers double bonds.

Abstract: The invention relates to a sealing collar for a cylinder-and-piston unit, wherein the sealing collar is essentially received in a groove that is inserted into the cylinder or the piston, respectively, and the sealing collar comprises two sealing lips, the first sealing lip thereof being acted upon dynamically and making catch at the piston or the cylinder, respectively, while the second sealing lip thereof is acted upon statically and rests on a bottom of the groove. It is the core of the invention that the sealing collar includes a circumferential extension that extends in parallel to the sealing lips, is arranged radially between the first sealing lip and the second sealing lip and projects from the sealing lips in an axial direction.

Abstract: The present invention relates to sulphur-crosslinked hydrogenated vinylpolybutadienes which serve for production of technical rubber items and of tyre components and have very good recovery performance over a wide temperature range.

Abstract: An electrohydraulic brake system with driving dynamics control comprising a master cylinder that is operable by a brake pedal and includes at least one piston, which is displaceably arranged in a housing of the master cylinder and delimits a hydraulic pressure chamber together with the housing, the pressure chamber being connectable to an unpressurized pressure fluid reservoir by way of a pressure fluid reservoir connection and a pressure fluid channel and to wheel brakes to by way of an outlet, with a pressure fluid supply device supplying pressure fluid from the pressure fluid reservoir in the direction of the wheel brakes in the case of driving dynamics control.

Abstract: The present invention provides peroxidically crosslinked hydrogenated vinylpolybutadienes which serve for production of technical rubber products and which have very good recovery performance over a wide temperature range.

Abstract: A master cylinder 1, especially for a controlled brake system, includes at least one piston 3, 4; 53, 54 displaceable in a housing 2, which is sealed in relation to a pressure chamber 7, 8 by means of a sealing element 5, 6 arranged in an annular groove 23, 24 of the housing 2, said pressure chamber being connectable to an unpressurized supply chamber 11, 12 by means of transverse bores 9, 10; 50, 51 provided in the piston 3, 4; 53, 54. Several recesses 15, 16, 17 are arranged on an inside surface 13, 14; 59, 60 of the piston 3, 4; 53, 54 into which the transverse bores 9, 10; 50, 51 open.

Abstract: temperature range The present invention provides peroxidically crosslinked hydrogenated vinylpolybutadienes which serve for production of technical rubber products and which have very good recovery performance over a wide temperature range.

Abstract: A cylinder, in particular for motor vehicle hydraulic brake systems, i includes at least one plunger piston (3) displaceable in a housing (2), at least one circular sealing collar (5) provided in an annular groove (4) of the housing (2) and having a dynamically applied inside sealing lip (6) which abuts with a first sealing surface (8) on the plunger piston (3), and a statically applied outside sealing lip (7) which abuts with a second sealing surface (9) on a bottom (10 of the annular groove (4), as well as a collar back (17). The collar back (17) has an uneven design and includes at least one circumferential sealing surface (18; 24).

Abstract: The invention relates to a piston unit having a captive spring for a cylinder, particularly for a tandem master cylinder of a motor vehicle, wherein the spring, with a first end, is supported at least indirectly on a piston and, with a second end, is supported on a retaining device that can be displaced relative to the piston, and the movement of the retaining device relative to the piston is limited by securing means. The invention is characterized in that the securing means have a projection, which is mounted in a non-detachable manner on the piston and whose free end is provided with a stop that limits the movement of the retaining device relative to the piston.

Abstract: The invention relates to a sealing collar for a cylinder-and-piston unit, wherein the sealing collar is essentially received in a groove that is inserted into the cylinder or the piston, respectively, and the sealing collar comprises two sealing lips, the first sealing lip thereof being acted upon dynamically and making catch at the piston or the cylinder, respectively, while the second sealing lip thereof is acted upon statically and rests on a bottom of the groove. It is the core of the invention that the sealing collar includes a circumferential extension that extends in parallel to the sealing lips, is arranged radially between the first sealing lip and the second sealing lip and projects from the sealing lips in an axial direction.

Abstract: The invention relates to a piston unit having a captive spring for a cylinder, particularly for a tandem master cylinder of a motor vehicle, wherein the spring, with a first end, is supported at least indirectly on a piston and, with a second end, is supported on a retaining device that can be displaced relative to the piston, and the movement of the retaining device relative to the piston is limited by securing means. The invention is characterized in that the securing means have a projection, which is mounted in a non-detachable manner on the piston and whose free end is provided with a stop that limits the movement of the retaining device relative to the piston.

Abstract: Mixtures of A) polybutadiene gel and B) other rubbers containing C.dbd.C double bonds, the quantity of polybutadiene gel A), based on the sum of A)+B), being 1 to 70% by weight, show as vulcanizates a favorable combination of the properties hysteresis loss and abrasion resistance.