Abstract: A pneumatic brake booster with a booster housing is subdivided into at least one working chamber and at least one vacuum chamber by means of at least one axially movable wall capable of being acted upon with a pneumatic differential pressure. An actuable input member includes a valve piston, with an output member for acting upon a brake master cylinder with an output force. A control valve is arranged in a control housing and can be actuated by the valve piston for controlling the differential pressure. An elastic reaction element is arranged in a control housing recess and against which the output member bears. Means for setting a distance z between the valve piston and the reaction element are provided on the output member.

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: A pneumatic brake booster with a booster housing, which comprises a first and a second housing shell and is subdivided into a working chamber and a vacuum chamber by an axially movable wall to which a pneumatic differential pressure can be applied, with the movable wall being formed of a diaphragm plate and a diaphragm abutting thereon that includes a radially inward sealing bead and a radially outward sealing bead for sealing the two chambers and the radially outward sealing bead is compressible between the housing shells. To improve the compression of the radially outward sealing bead, the radially outward sealing bead has a circumferential, uniform rib structure.

Abstract: A pneumatic brake servo which can be acted on by a pneumatic differential pressure is described. The brake servo includes an actuable input member comprising a valve piston, an output member for acting on a master brake cylinder, and a control valve which is arranged in a control housing and which can be actuated by the valve piston for controlling the differential pressure. An elastic reaction element is arranged in a control housing recess and against which the output member bears. The input member acts with an input effective area A1 on the reaction element, and the output member acts with an output effective area A2 on the reaction element. The ratio of output effective area A2 to input effective area A1 determines the force boost ratio of the brake servo. Means are provided for adjusting the output effective area A2 in the assembled brake servo.

Abstract: The present device relates to a housing module 1 for a brake booster. The housing module has a housing shell 3 that accommodates a movable wall 4. The movable wall subdivides an interior space of the brake booster into a low-pressure chamber 5 and a working chamber 6. Also, a control housing 11, in which a control valve 10 is arranged, controls a pressure difference acting on the movable wall 4 and is operable of an actuating rod 9. The control valve includes two sealing seats 12, 13 which are arranged concentrically to one another and of an elastically deformable valve body 14.

Abstract: The present invention relates to a brake force transmission device for a brake force booster with an elastic reaction element, and input member with an associated effective surface, an output member with an associated effective surface, and a first transmission ratio that is defined by a ratio of the effective surfaces being in operative engagement with the reaction element. An object of the present invention is to provide means of a simple design, if possible arranged in the form of an assembly, giving the operator of an automotive vehicle increased support when high braking forces are required. The essence of the invention is the provision of means which starting from a determined pressure prevailing in the reaction element will reduce the reaction force introduced into the input member by a defined amount. The driver is thus given additional support, requiring a proportionately reduced increase in input force for a further increase in output force.

Abstract: The present invention relates to a pneumatic brake force booster with means for fastening the said to a vehicle wall which extend through the interior of the brake force booster, wherein a fixed stop for a first housing part is provided on a first end and a stop that is adjustable by means of a rotation for a second housing part is provided on a second end, and with means for the pneumatic sealing of housing openings for the fastening means. The gist of the present invention resides in that the fastening means has a smooth sealing portion adjacent to the adjustment area of the adjustable stop, and in that the sealing means, by multilateral abutment on a conical abutment surface of the adjustable stop, on the smooth sealing portion and the associated housing portion, closes a slot between the fastening means and the adjustable stop and a slot between the stop and the housing part. This achieves a simple and low-cost sealing of housing openings for the fastening means.

Abstract: The present invention discloses an arrangement for attaching a brake force booster, that is operable by a push rod, to the splashboard of an automotive vehicle by means of an adapter, wherein a sealing element is interposed between the adapter and the splashboard which additionally is in a radially sealing abutment with the push rod. In order to ensure the correct positioning of the sealing element during the assembly of the brake force booster, the present invention arranges for the brake force booster to include at least one connecting bolt having attaching elements at its ends for attaching the brake force booster to the adapter and for attaching a master brake cylinder connected downstream of the brake force booster to the booster housing, and the adapter has at least one recess which accommodates the attaching element associated with it, and the sealing element includes at least one guide bush which is adapted to be slipped on the attaching element.

Abstract: A vacuum brake force booster for a vehicle brake system, in particular, with a master brake cylinder that can be attached along with the brake force booster to a wall of an automotive vehicle, with a housing comprised of at least two wall elements attached to each other, and with at least one reinforcing element that extends through the interior of the housing and has a thin-walled tubular shape. The essence of the present invention is that the reinforcing element on at least one end passes over into a radially extending fastening portion which extends, at least in a partial zone, in parallel to the associated wall element and is supported on the wall element so that the interior of the brake force booster is separated pressure-tightly from the atmosphere. The present invention permits a simple and low-cost assembly of the brake force booster without the necessity of additional sealing elements which are difficult to mount.

Abstract: A method for the preparation of tetrahydrofurfuryl-(2)-methacrylate by transesterification of methyl methacrylate or ethyl methacrylate with tetrahydrofurfuryl-(2)-methyl alcohol in the presence of the corresponding alkali metal or alkaline earth metal as a catalyst and while air or oxygen is passed through the reaction mixture.