Abstract: The present invention relates to a pin guiding and/or damping element for floating-caliper spot-type disc brakes, the brake comprising a brake carrier (8) as well as a brake housing (10) which is axially slideable thereto and which straddles a brake disc and brake shoes, while the brake carrier and/or the brake housing is further provided with at least one pin (4) which is guided in a bore (12) of the housing and/or the brake carrier (8), as well as with at least one elastic guiding and/or damping portion seated in the bore. In order to accomplish a good damping as well as an improved protection for the entire guiding length of the guiding pin (4), it is provided that the guiding and damping portion (14) is furnished with a pleated bellows portion (16) at least one of its ends, and that adjacent to this pleated bellows portion (16), there is provision of a rolling diaphragm (22).

Abstract: An adjusting device for a disc brake comprised of a brake piston which, for the actuation of a brake shoe, is slidably arranged in a brake cylinder and which is actuatable by way of a hydraulic and a mechanical actuating device. Between the brake piston and the mechanical actuating device an adjusting member is provided which is composed of two adjusting elements interconnected by way of a thread without self-locking engagement. The adjusting member comprises a friction clutch having conical friction surfaces for fixation of one of the adjusting elements on mechanical actuation; and includes a spring which is supported on a stop formed fast with the housing and on a roller bearing seated on one of the adjusting elements. For the improved manufacture of the parts and in order to improve and facilitate the assembly, the accommodation sleeve comprises at least one groove extending substantially in the direction of the longitudinal axis of the accommodation sleeve.

Abstract: A spot-type disc brake for automotive vehicles, including a brake carrier and a slidable housing and with an arrangement for preventing the brake housing from being lifted clear of its seat is disclosed. The retaining arrangement includes a wire element mounted on the brake housing and forming a projection which engages into or underneath an axially extending recess provided on the brake carrier.

Abstract: An automatic adjusting device for a disc brake having a brake piston displaceably arranged in a brake cylinder for the purpose of actuation of a brake shoe. This device which is actuatable by means of a hydraulic and a mechanical actuating device, includes an adjusting member between the brake piston and the mechanic actuating device which member is composed of two adjusting elements, an adjusting spindle and adjusting nut interconnected via a thread without self-locking engagement. It further comprises a friction clutch having conical friction surfaces for fixing one of the adjusting elements in position on mechanical actuation. One of the conical friction surfaces is on one of the adjusting elements and the other friction surface is on a mechanically actuatable clamping member. It also comprises a bowl-type (cup-shaped) spring retainer which is secured to the brake housing by means of an accommodation sleeve.

Abstract: The present invention relates to a pin guiding and/or damping element for floating-caliper spot-type disc brakes, the brake comprising a brake carrier (8) as well as a brake housing (10) which is axially slideable thereto and which straddles a brake disc and brake shoes, while the brake carrier and/or the brake housing is further provided with at least one pin (4) which is guided in a bore (12) of the housing and/or the brake carrier (8), as well as with at least one elastic guiding and/or damping portion seated in the bore. In order to accomplish a good damping as well as an improved protection for the entire guiding length of the guiding pin (4), it is provided that the guiding and damping portion (14) is furnished with a pleated bellows portion (16) at least at one of its ends, and that adjacent to this pleated bellows portion (16), there is provision of a rolling diaphragm (22).

Abstract: The present invention is concerned with a disc brake and in particular to a floating caliper spot-type disc brake. In the practice of the invention, a holding member in the area of a bore in the brake housing has a smaller diameter than the bore diameter.

Abstract: A pin guide and damping bushing for the caliper of a floating-caliper spot-type disc brake which is provided with a brake carrier and a caliper axially slidable relative to the brake carrier and straddling a brake disc and brake shoes. The brake carrier or the caliper is provided with a least one pin which is guided in a bore of the caliper or of the brake carrier. At least one elastic guide element (4) is provided for the pin and inserted in the bore, a stop element (6) which on itself is rigid and limits radial motions of the pin within the bore and which is configured with a base body having a substantially circular cylinder-shaped cross-section and is provided with outwardly extending extensions (26) constituting stop faces. One section of the damping and guide element (4) is arranged in interstices which are formed externally between said extensions.

Abstract: A sealing cap for cylindrical parts such as a bolt guide of a spot-type disc brake, comprises an elastic pleated bellows (15), one end portion of which is fastened to the periphery of a first cylindrical part, while the other end portion thereof is secured to the periphery of a second cylindrical part. A rigid reinforcing and retaining member (16, 17) is provided on at least one of said end portions (13, 14), with each reinforcing and retaining member being arranged with at least part of its radial extension on the same radius. To create a sealing cap which affords ease of manufacture and assembly, at least one of the reinforcing and retaining members (16, 14, 58) is provided of substantially U-shaped configuration when viewed in axial cross-section, thus forming first and second wall portions (26, 27; 47, 67; 59) as well as a base portion interconnecting said wall portions.

Abstract: A brake booster for automotive vehicles comprises a low-pressure casing which is sealingly subdivided into a low-pressure chamber and a working chamber by a movable wall. The low-pressure casing is shaped to provide waists in the area of aligned bolts to fasten one end wall of the casing to a master brake cylinder and the other end wall of the casing to the vehicle. The casing has a casing wall section in the area of the waists extending in the axial direction to transmit tractive forces. In addition, tie elements may be provided outside the casing to interconnect the aligned bolts.

Abstract: A protective cap (11) for a bolt guide of a spot-type disc brake, comprises an elastic (pleated) bellows, one end portion of which is fastened to the periphery of a first cylindrical part, while the other end portion thereof is secured to the periphery of a second cylindrical part. A rigid reinforcing and retaining member (15, 16) is provided on each one of said end portions (12, 13) with both reinforcing and retaining members being arranged with at least part of their radial extension on the same radius. To avoid damage to the cylindrical part and the guide surface thereof, at least one (16) of the reinforcing and retaining members is secured radially outwards at the corresponding end portion of the elastic bellows. Thus, an axially extending annular surface is formed which is free from the material of the elastic bellows and wherein the reinforcing and retaining members (16) together with this annular surface is arranged in press fit in a corresponding bore (20) of the associated cylindrical part.

Abstract: A braking caliper for a pressure medium-operated spot-type disc brake is provided. The wheel cylinder piston for forcing the brake pads are held in a bore of a braking caliper which embraces the edge of the brake disc. The outer cylindrical surface of the pot-shaped wheel cylinder comprises a flange or collar which is in abutment with a shoulder provided between the two sections of the bore formed as a stepped bore. The outer cylindrical surface of the wheel cylinder is press fit in the bore of the braking caliper.

Abstract: Differential pressure brake boosters are known having a reinforcement tube extending axially through the low-pressure casing with its ends fastened to both end surfaces of the casing. A mechanically actuated control valve for connecting the working chamber to the low-pressure chamber or to atmosphere is axially movable in the reinforcement tube. A sleeve surrounding a master cylinder piston push rod has radial ribs extending through longitudinal slots of the reinforcement tube to connect the push rod to the movable wall. These ribs are subjected to a high bending stress. According to the present invention the radial ribs are constructed as flat tongues disposed in a common plane, the tongues being engaged on a side thereof adjacent the low-pressure chamber by an outwardly angled collar of an extension of the housing of the control valve.

Abstract: The die-casting mold and the die-cast brake master cylinder housing comprise an axial master cylinder piston bore and a compensating bore, whose latter axis extends parallel to the axis of the master cylinder piston bore. The compensating bore has one end terminating in a compensating reservoir port oriented transversely relative to the housing's longitudinal axis and its other end terminating in a sealing chamber that is formed by an extension of the master cylinder piston bore. To render the casting process for manufacturing a die-cast brake master cylinder housing simpler, the mold comprises a core for the compensating bore whose longitudinal cross-sections containing the longitudinal axis are of conical construction, with the narrowest point being adjacent to the compensating reservoir port and whose cross-sections extending vertically to the longitudinal axis are of substantially reniform construction, while the concave sides of the cross-sections are close to the master cylinder piston bore.

Abstract: A sealing cap for mating to cylindrical parts such as the bolt guide of a spot-type disk brake. The cap includes a resilient boot one end portion of which is adapted to be secured circumferentially to a first cylindrical part and the other end portion of which is adapted to be secured circumferentially to a second cylindrical part. At least one of said end portion comprises a rigid insert member. In order that the sealing cap may be easily mounted and secured with no adverse effects, the other end portion may comprise a rigid insert member. Both insert memebers have at least a part of the radial extension thereof are disposed the same radial distance from the axis of the cylindrical parts.

Abstract: A master cylinder device for controlling the pressure of hydraulic braking fluid in two separate braking circuits of a hydraulic braking system includes a housing having two parallel and co-extensive pressure chambers each movably accommodating one master piston. A pressure element transmits the brake pedal force to one of the master pistons to pressurize the fluid present in a first pressure compartment and thus in the associated first brake circuit. A part of the thus pressurized fluid is diverted to an actuating compartment of the other pressure chamber to act on the other master piston and thus to pressurize the fluid present in the second pressure compartment and in the associated other brake circuit. When elevated pressure fails to develop in the first pressure compartment, the pressure element engages a tappet of the other master piston to mechanically displace the same in the actuating direction and thus to pressurize the fluid supplied to the other brake circuit.

Abstract: An integral valve body of elastic material for use in the multiple function valve of a vacuum-operated brake power booster has two roughly circular cylindrical parts which are arranged one behind the other. Two annular portions of the valve body which succeed the cylindrical parts are formed to be particularly rigid. A bellows portion which forms a roll fold and interconnects the annular portions has an S-shaped longitudinal sectional profile in the longitudinal direction of the valve body, the profile being comparatively thin-walled.

Abstract: A low-pressure casing for a brake booster for automotive vehicles comprising two casing shells. A central ring flange is located at the inner surface of the end wall of each of the two casing shells. The portion of each end wall lying outside the ring flange is of truncated-cone-shaped construction and merges into a cylindrical circumferential casing section. At each of these merger points, a prop ring is inserted to bear against the inner surface of the associated one of the two casing shells.

Abstract: A low-pressure casing for a brake booster for automotive vehicles comprises two casing shells which are sealingly interconnected and include a reinforcement plate at the inner surface of the casing end wall of each casing shell. The reinforcement plate is fastened to the master brake cylinder or to the automotive vehicle by means of fastening bolts. The section of the casing end wall which lies radially outside the reinforcement plate is of truncated-cone-shaped construction and merges into a cylindrical section of the casing. Inserted in the inner of the casing at the transition from the truncated-cone-shaped section into the cylindrical section is a prop ring which is via webs formed integrally with the reinforcement plate.

Abstract: The vacuum brake boosters used today require a relatively heavy vacuum housing to gain the necessary stiffness for transmitting the mechanical actuating force. According to the present invention draw bars extend from one housing wall to the other parallel to the push rod and penetrating the vacuum piston in a sealed manner to receive the mechanical force. Thus, the vacuum housing does not receive the mechanical force and as a result can be constructed of lighter material. The movable sealing means provided between the vacuum piston and the draw-bars are in the form of small rolling diaphragms.

Abstract: A brake booster for automotive vehicles comprises a low-pressure casing which is sealingly subdivided into a low pressure chamber and a working chamber by an axially movable wall. Axially movable wall includes a flexible diaphragm abutting a diaphragm plate. The diaphragm plate extends with radial ribs through wide longitudinal slots of a central reinforcement tube of the low-pressure casing and transmits the boosting force from the diaphragm plate to a centrally located control valve housing. A sliding element axially slidable together with the movable wall is guided at the axially extending rims of each of the longitudinal slots and overlaps the rims of the associated one of the longitudinal slots adjacent the working chamber. A rolling diaphragm of the movable wall disposed between the diaphragm plate and the reinforcement tube, rolls over the sliding element upon the boosting force movement, the sliding element bridging the longitudinal slot at this point.