WO2019068619A1

WO2019068619A1 - Disk brake for a utility vehicle, and brake pad set

Info

Publication number: WO2019068619A1
Application number: PCT/EP2018/076601
Authority: WO
Inventors: Dimitrij Habermann; Maximilian HAUSER
Original assignee: Knorr-Bremse Systeme für Nutzfahrzeuge GmbH
Priority date: 2017-10-06
Filing date: 2018-10-01
Publication date: 2019-04-11
Also published as: DE102017009295A1

Abstract

Disclosed is a disk brake (10) for a utility vehicle, comprising a brake caliper (1) which grips a brake disk (2), is designed as a sliding caliper, is fastened to a stationary brake support (6) and has a central opening (9) above the brake disk (2), the disk brake (10) further comprising two brake pads (3, 3') which are arranged in the brake caliper (1), are movable in opposite directions, and each include a lining support plate (4) and a friction lining (5) fastened to the lining support plate (4), a brake pad (3) on the action side or brake application side being able to be pressed against the brake disk (2) by means of a brake application device via at least one brake piston, the disk brake (10) also comprising at least one restoring device, by means of which the brake caliper (1) can be returned after displacement and release of the brake for braking purposes, the restoring device having a spreading device (8) which engages the opposing brake pads (3, 3'), acts equally against the brake application direction and has spreading elements that engage the associated lining support plate (4), the spreading device (8) being arranged in the central opening (9). According to the invention, the disk brake (10) is equipped with a spreading device (8) in the form of scissors which include at least two scissor arms as spreading elements as well as at least one spring element (22, 25). A corresponding brake pad set is also disclosed.

Description

DESCRIPTION

Disc brake for a commercial vehicle

and brake pad set

The invention relates to a disc brake for a commercial vehicle according to the preamble of claim 1. The invention also relates to a brake pad set. In a generic disc brake, also known as a sliding caliper brake, an action-side or tension-side brake pad is pressed against a vehicle-side brake disc in the case of braking by means of an application device which can be actuated pneumatically or electromotively. In the further course of the braking operation, the brake caliper, relative to the brake disc, is displaced counter to the application direction of the brake pad on the brake side, while the opposite, rearward brake pad is entrained and pressed against the other side of the brake disc.

After releasing the brake remains in the known disc brake caliper in this position, in which the brake pads, but at least the reaction-side brake pad while depressurized, but abraded against the brake disc. The residual grinding moments of the brake linings which occur as a result during driving have a disadvantageous effect insofar as they lead to increased fuel consumption as well as a reduction in the service life of the components involved, namely the brake disk and the brake linings.

Although there is a slight release of the brake pads during driving, for example, by a wobble of the brake disc and by vibrations and lateral acceleration when cornering. However, these effects are not sufficient to effectively prevent the mentioned residual grinding moments.

To address this problem, a disc brake is described in the generic DE 10 2007 001 213 with a rear part device, in one of the guide rails, on which the caliper slidably on

Brake carrier is held, is arranged and the a resilient Rückstellele- ment, by which the caliper is moved to an initial position.

In principle, this construction has proven itself. However, the use of this known rear part device can lead to problems in air-operated disc brakes heavy commercial vehicles, since here wide limits of variable influences by component tolerances and component deformations are effective that do not allow a safe function of this rear part in each case. Comparable problems arise in a disc brake as it is thematized in DE 10 2012 006 1 1 1 A1. In this case, a rear-part device is arranged on the side facing the application device, facing the reaction-side brake pad, whereby an effective, in particular automatic reset of the caliper is achieved, while at the same time minimally interfering with the system rigidity.

In any case, the rear part device acts on the brake caliper, wherein the brake carrier acts as an abutment. DE 43 01 621 A1 describes a floating caliper disc brake with a stationary brake carrier having two projecting beyond the outer edge of a brake disc support arms, arranged on both sides of the brake disc, depending on a friction lining and a back plate having brake shoes, which are slidably supported on the support arms , with a floating axially on the brake carrier guided floating caliper, which surrounds the brake shoes and has a specific pressure on the brake shoes to the brake disc actuator, with an axially acting in the brake release direction on the brake shoe spring arrangement, the setting of a clearance between brake shoes and brake disc after braking supported. The spring arrangement has at least one spreading spring, which is attached to a support arm of the brake carrier in the axial direction as a whole immovably, that the attachment to a located on the outer edge of the brake disc portion of the support arm, and that the spreading spring has at least two spring arms, the the spring plates of the brake shoes in the axial direction resiliently rest.

US2014 / 0339026 A1 describes a spreading spring comprising a locking arm connecting the spreading spring to a braking component, a retraction arm; and biasing means interposed between the locking arm and the Rückholarm is arranged, wherein the biasing device comprises six spiral loops or more, store the energy during a brake activation and once the braking process is completed, the brake components (brake pad) retreat. A brake caliper in the form of a caliper, which is not a sliding caliper, is indicated. This is suitable for a passenger vehicle, but not for a commercial vehicle.

The invention has for its object to further develop a disc brake of the generic type so that the service life of the brake pads and the brake disc in particular increases structurally simplest means and operating costs are reduced overall.

Another object is to provide a corresponding brake pad set.

This object is achieved by a disc brake with the features of claim 1.

The further object is achieved by a brake pad set with the features of claim 22.

A disc brake for a commercial vehicle, comprising a brake caliper, which engages a stationary brake carrier and has a central opening above the brake disc, two brake calipers arranged in opposite directions, one respective carrier plate and one mounted thereon Having friction lining having brake pads, of which an action-side or zuspannseitiger brake pad can be pressed by means of an application device via at least one brake pad against the brake disc, and at least one return actuator, with which the caliper is traceable after a brake-related displacement and release of the brake, wherein the rear part a on the opposite brake pads attacking, opposite to the respective application direction equal acting spreader having acting on the respective lining carrier plate spreading elements, wherein the Spreizeinric is arranged in the central opening, is provided with a spreading device in the manner of a pair of scissors, which has at least two scissor arms as spreading and at least one spring element. The invention enables an automatic positioning of the rear part device for active brake lining provision during a clamping operation of the disc brake. In conjunction with a return mechanism in the form of a spreading device, which works according to a "scissor-type" principle, it can be ensured that both brake linings are always pulled by the same amount (= half the clearance of the brake disc), regardless of the state of wear and the tolerance positions also the advantage that when mounting the rear part device in the disc brake does not have to be paid to a precise adjustment, since a correct positioning can be done during the first brake operation.

The attack of the spreader on the two brake pads is advantageously carried out on the lining carrier plates. In order to avoid tilting of the respective brake lining during the return, the expansion element acts symmetrically on two contact areas on the right and left.

An inventive brake pad set for the disc brake according to the invention comprises at least two brake pads each having a lining carrier plate, each one mounted on the lining carrier plate friction lining, and a rear part with a device acting on the opposing brake pads, opposite to the respective application direction of a disc brake to be assigned same acting spreader with at the respective Pad carrier plate attacking expansion elements. The lining carrier plates each have a groove in opposite, lateral edge regions of an upper side, wherein the grooves extend in a longitudinal axis of the lining carrier plate and are molded from the upper side into the material of the lining carrier plate.

In one embodiment, the at least two scissor arms of the spreading device are pivotable relative to one another about a pivot axis, which is arranged in the middle of the opening perpendicular to a brake disk rotational axis. In this way, the rear part means can be arranged centrally in the caliper, wherein it is also arranged within an envelope of a rim of an associated wheel.

One embodiment provides that the at least two scissor arms of the spreading device are pretensioned about the pivot axis by means of the spring element counter to the respective application direction of the brake linings. This spring element thus forms a return spring, which in a Zuspannvorgang can additionally be stretched further and generates the restoring force for the rear part means for returning the brake pads in a simple manner. The return spring presses the legs of the scissors and thus the brake pads apart.

It is provided in a further embodiment that each scissor arm is formed in each case from two identical leg parts, wherein the respective two identical leg parts are respectively connected via a common central portion and provided at their free ends in each case with a transmission section for cooperation with the respective lining carrier plate. The leg parts and thus the scissor arm are all the same length and identical. As a result, a number of parts of different components can be reduced. It is also advantageous if the scissors with the scissor arms is symmetrical in order to achieve a uniform effect on the brake pads.

In yet a further embodiment, the transfer sections are engaged with grooves in opposite, lateral edge regions of the lining carrier plates of the brake linings. It is advantageous if in one embodiment, the transmission sections are designed circular cylindrical. The transmission sections are displaceable in the grooves, but have the least possible play in the direction of the brake disc axis of rotation. By means of the transfer sections guided in the grooves, there is the advantage that the scissor arms or their leg parts can not be lifted off the lining carrier plates.

An alternative embodiment provides that the transmission sections have pressure surfaces, which are each in contact with a portion of lining sides of the lining carrier plates of the brake linings. This is advantageous, since so the back part u.a. can also be retrofitted without having to change the lining carrier plates.

For a simple and effective support, the spreading device on a stationary headband with a holding device for the scissor arms. The fixed headband gives the advantage of a fixed reference position.

In one embodiment, the stationary headband is firmly attached to the brake carrier. In this case, different types of attachment can be used, such as screws, rivets, welding, force and / or shape conclusive connection and the like more. Likewise, different mounting locations on the brake carrier are possible, such as on the brake carrier horns. For example, an attachment via vertical holes in the inner, ie zuspannseitigen, brake carrier horns or on the guide rails suc gene. Thus, the rear part device can be mounted stationary not only in a simple manner, but also to save space, since no additional parts are required.

Thus, in one embodiment, the stationary retaining clip can be arranged between a tension-side edge of the opening and the application-side brake lining, which allows a space advantage.

One embodiment provides that the stationary retaining bracket comprises a central portion and arm portions adjoining thereto on both sides, fastening portions of the arm portions being fastened to the brake carrier. This results in a compact and simple construction.

In an alternative embodiment, the mounting portions of the retaining clip may each have an opening and be arranged coaxially to bearing receptacles of the brake carrier for attachment of guide rails by means of bearing screws between the guide rails and a mounting side of the brake carrier such that the headband is fixedly secured to the brake carrier. This results in the advantage of easy retrofitting, since no existing components, such as. the brake carrier, must be edited later.

In another embodiment, the holding device comprises an axle body with the pivot axis. This results in a simple structure. For this purpose, the holding device may be formed as a kind of wire hanger with the axle body, arm portions which carry the axle body, and fastening portions with which the axle body and the arm portions are attached to the headband. The holding device can thus form a simple connecting piece between the headband and the spreader with the scissor arms. A wire bow allows for easy production.

Alternatively, the holding device may be U-shaped and have a holding portion whose ends are each connected to a holding arm, wherein the axle body is attached to the holding portion, and wherein the Retaining arms are attached to the headband. Here, too, a simple design can be made possible by a metallic sheet material as a stamped and bent part in a simple manner. An embodiment provides that the spreader is formed centered in the opening. This is done, for example, when applying the disc brake, since in this case sufficient force for moving the pivot axis of the spreader is provided. In this way, the spring element of the spreading device is advantageously simply tensioned, wherein by means of the centering a uniform distribution of the restoring force of the spring element can be achieved.

In yet another embodiment, the holding device may be slidably mounted on the headband in the direction of the brake disc axis of rotation. For example, For example, bushings, in particular rolled bushings, may be attached to the retaining clip into which the retaining device, e.g. with connecting wire ends, plugged in a simple manner. This allows a simple positioning of the spreader during the first application of the disc brake. In addition, this can also be a recurring new position.

A further embodiment provides that the holding device is slidably inserted with fixing portions in bushes on the headband in the direction of the brake disc rotation axis, said connection between the bushes and the mounting portions of the holding device is designed as a friction pair with a frictional resistance that a static friction this friction pairing is smaller than a required displacement force in the direction of the brake disc axis when applying the disc brake for moving the spreader, and that the static friction force of the friction pair safely exceeds a restoring force of the spring element of the spreader and thus also a Sattelverschiebekraft. Thus, it is advantageously possible that a displacement of the spreader and its centering can be effected only by the displacement force during application of the disc brake, since the static friction force is chosen so large that the restoring force of the spring element does not overcome this static frictional force and thus no displacement of the spreader can cause.

In an alternative embodiment, the holding device has at least one deformable element, to which the spreading device is directly connected, wherein the at least one deformable element during the application of the Disc brake plastically permanently deformed. A centering thus takes place in a simple manner at a first application of the disc brake.

The at least one deformable element can be formed from the holding section, from a section of the holding section or from a plurality of sections of the holding section of the holding device. In this way, no additional component with space required.

Another embodiment provides that the spring element comprises a central portion and two spring arms, wherein the spring element is formed symmetrically to a longitudinal center line of the opening and biased to the

The pivot axis is bent around, and wherein one spring arm of the spring element is operatively connected to a leg portion of a scissor arm, and wherein the other spring arm of the spring element is in operative connection with a leg portion of the other scissor arm opposite the one leg portion. Such a type return spring is space-saving.

Alternatively or additionally, the spring element can be formed as a spiral spring, wherein a spring end of the spring element is in contact with one side of the one scissor arm, and another spring end of the spring element is in contact with the other scissor arm. In this way, a space-saving spring in a conventional spiral design can be used. In this case, the spring element can advantageously be arranged without additional space between the central portions of the scissor arms.

In yet another embodiment, it is provided that the scissor arms of the spreading device have a rectangular cross-section, wherein the long sides of this rectangular cross-section at right angles to a pivot axis of the

Scissor arms are lost. This results in the advantage of a high bending stiffness of the scissor arms in the direction of the forces to be transmitted.

A still further embodiment provides that the central region of the opening on both sides of a virtual center of the opening extends approximately parallel to the plane of the brake disk in a length in a range of 30 to 50% of a longitudinal axis of the opening. A further embodiment provides that the central region of the opening on either side of a virtual center of the opening approximately parallel to the plane of the brake disc in a length in one Range of 30 to 50% of a longitudinal axis of the opening extends. This results in an advantageous adaptation of the spring forces.

Further advantageous embodiments of the invention are characterized in the subclaims.

Embodiments of the invention will be described below with reference to the accompanying drawings.

a schematic perspective view of an embodiment of a disc brake according to the invention with a first embodiment of a rear part device; a schematic perspective view of a spreading device of the first embodiment of the rear part of Figure 1 with brake pads; Figure 3 is a schematic perspective view of a retaining clip of the first embodiment of the rear part of Figure 1;

Figure 4 is a schematic perspective view of the spreader of the first embodiment of the rear part according to

FIGS. 1 and 2;

FIGS. 5-6 show schematic perspective views of a variant of the spreading device of the first exemplary embodiment of the return device according to FIGS. 1 and 2; a schematic perspective view of a second embodiment of the rear part device; and FIG. 8 is a schematic partial sectional view of the invention

Disc brake according to FIG. 1 with the second exemplary embodiment of the rear part device according to FIG. 7. The terms "top", "bottom", "left", "right" refer to the respective arrangements in the figures.

An "upper side" and a "lower side" of a brake pad 3, 3 'or a loading carrier plate 4 always relate to the installation situation of the respective brake pad 3, 3'. In this case, the underside of the respective brake pad 3, 3 'in the radial direction is closer to a brake disk axis of rotation 2a than the top of this brake pad 3, 3'. 1 shows a schematic perspective view of an embodiment of a disc brake 10 according to the invention with a first embodiment of a rear part. FIG. 2 shows a schematic perspective view of a spreader 8 of the first embodiment of the rear part device according to FIG. 1 with brake linings 3, 3 '.

The disc brake 10 is here e.g. intended for a commercial vehicle and comprises a brake caliper 1, a brake disk 2 with a brake disk axis of rotation 2a, two brake pads 3, 3 ', a brake carrier 6 and the rear part device.

The caliper 1 engages over the brake disk 2 and, relative to the brake disk 2, is mounted axially displaceable in the direction of the brake disk axis 2a on a brake carrier 6, for which purpose the brake caliper 1 by means of axial bearings 30, 30 '(see sectional view FIG. 8) with bearing sections 31 on guide rails 32 is mounted, which are connected to the stationary held on the vehicle to be assigned brake carrier 6.

The brake caliper 1 comprises an application section 1 1, a saddle back 12 and two tension struts 13. The application section 11 extends on one side of the brake disk 2 with one side parallel to the plane of the brake disk 2.

On the other side of the brake disc 2, also parallel to the brake disc 2 extending, the saddle back 12 is arranged. The saddle back 12 is connected to the application section 1 1 at one end in each case with a tension strut 13. The tie rods 13 extend substantially at right angles to the application section 11 and to the saddle back 12.

The application section 1 1 has an inner space in which an application device (not shown) of the disc brake 10 is arranged. An open tion of the interior points to the brake disc 2 and is closed with a plate, not shown, which is referred to as a bottom plate.

The Zuspannabschnitt 1 1, the saddle back 12 and the tie rods 13 set in this arrangement, a central opening 9 between them, which the

Brake disc 2 spans. The opening 9 has an imaginary longitudinal center line which lies in the plane of the brake disk 2 and connects the imaginary centers of the tension struts 13. In addition, the opening 9 has a further imaginary transverse center line, which connects an imaginary center of the Zuspannab- section 1 1 an imaginary center of the saddle back 12. The longitudinal center line and the transverse center line intersect at an imaginary center, which is referred to here as the virtual center of the opening 9.

The brake pads 3, 3 'are arranged on both sides of the brake disc 2 and each have a lining carrier plate 4 with a lining side 4a and a

Pressure side 4b on. On the lining side 4a a friction lining 5 is fixed in each case. The friction linings 5 each have to the brake disc. 2

In Figure 2, the brake carrier 6 is shown without brake disc 2 with the brake pads 3, 3 'and the spreader 8, wherein in contrast to Figure 1, the application-side brake pad 3 is in the foreground. An attachment side 6a of the brake carrier 6 is connected to a fixed component, not shown, of a vehicle to be assigned. In addition, the brake carrier 6 bearing mounts 6b for the guide rails 32 (see Figure 8) for the storage of the caliper 1.

In the brake carrier 6, the brake linings 3, 3 'are arranged in the so-called lining shafts between the respective two brake carrier horns 6c, 6'c and lie with portions of their undersides on portions of a respective, non-designated lining shaft bottom. This is clearly visible in FIG. The brake pads 3, 3 'can be pressed against the brake disk 2 on both sides in the case of braking. The friction lining 5 of each brake pad 3, 3 'is pressed against the brake disc 2 in function, that is, during braking. The brake pads 3, 3 'are accessible through the central opening 9 for a change and for maintenance. They can be inserted through this central opening 9 in their associated lining shafts and removed again from it. A rotary arrow about the brake disk axis of rotation 2a (Figure 1) indicates a main direction of rotation for forward travel of the vehicle, the disc brake 10 is assigned to. With respect to the main direction of rotation of the brake disc 2, an inlet side ES and opposite one outlet side AS are fixed to the disc brake 10.

A lining retaining clip 16 (see FIG. 8) is arranged above the brake linings 3, 3 'in the transverse direction of the opening 9 or in the direction of the brake disc rotational axis 2 a between the tightening section 11 and the saddle back 12. An application-side retaining end of the lining retaining clip 16 is fastened in a holding section 14 to the application section 11 of the caliper 1, wherein an opposite, back-side retaining end of the lining retaining clip 16 is fixed to a holding section 15 of the saddle back 12. The pad retaining bracket 16 presses here with sections of its underside on a respective lining retaining spring 7 of both brake pads 3, 3 ', whereby the brake pads 3, 3' are held in their lining shafts. The lining retaining springs 7 are respectively held on the lining carrier plates 4 at projections 4d. An actuation of the disc brake 1 for a braking operation by means of the application in the clamping portion 1 1 of the brake caliper 1 there arranged in a receiving space Zuspanneinrichtung, for example with a brake lever which is positioned in a dome of the caliper 1. The associated brake pad 3, referred to as action-side or zuspannseitiger brake pad first contacts the brake disc 2 during braking. In the further course, the caliper 1 is displaced in opposite directions by means of occurring reaction forces, taking along the reaction-side brake pad 3 'until it likewise arrives at the brake pad 3' Brake disc 2 rubbing comes to rest. The reaction-side brake pad 3 'is also called the back-side brake pad and further distinguished by the reference numeral 3' from the application-side brake pad 3.

After releasing the brake, the two opposing brake linings 3, 3 'are released so far from the brake disk 2 by means of the rear part device that they are free relative to the brake linings 3, 3'.

The rear part device has an opposite to the respective brake pads 3, 3 'attacking, opposite the respective application direction equal to kende spreader 8 with acting on the respective lining carrier plate 4 spreading elements.

In addition, the rear part device has a retaining clip 17 with a holding device 19 for the spreading device 8.

The spreader 8 is in this embodiment in the manner of a pair of scissors, preferably symmetrical, and here comprises two scissor arms as spreading and at least one spring element 22nd

Each scissor arm is in each case composed of two identical leg parts 20, 20 '; 21, 21 'formed. Thus, the two leg parts 20, 20 'of the one scissor arm are connected with first ends in such a way via a common central section 20a that the two leg parts 20, 20' lie in an imaginary common longitudinal axis. The other, free ends of the two leg portions 20, 20 'are each provided with a transmission portion 20e, 20'e for cooperation with the respective lining carrier plate 4. In this way, the two leg parts 20, 20 'are symmetrical with respect to an imaginary plane of symmetry, which runs at right angles to the imaginary common longitudinal axis through the middle of the central section 20a.

In the same way, the two leg portions 21, 21 'of the other scissor arm are connected to the first ends via a common central portion 21 a, wherein the two leg portions 21, 21' lie in an imaginary common longitudinal axis. The other, free ends of the two leg portions 21, 21 'are also each provided with a transmission portion 21 e, 21' e for cooperation with the respective lining carrier plate 4. In this way, these two leg portions 21, 21 'are symmetrical with respect to an imaginary plane of symmetry, which is perpendicular to the imaginary common longitudinal axis through the center of the central portion 21 a.

The scissor arms formed as described above are arranged in the opening 9 diagonally extending like a pair of scissors. In this case, one scissor arm runs diagonally from an inlet-side end of the lining carrier plate 4 of the application-side brake pad 3 to an outlet-side end of the lining carrier plate 4 of the back-side brake pad 3 ', the other scissor arm being symmetrical to the one scissor arm with respect to an imaginary longitudinal center line of the opening 9 diagonally from an inlet end of the Pad carrier plate 4 of the back-side brake pad 3 'to a outlet-side end of the lining carrier plate 4 of the application-side brake pad 3 extends.

The scissor arms are pivotable relative to each other about a common pivot axis 19a, which passes through the centers of the central portions 20a, 21a. The pivot axis 19a is perpendicular to the brake disc rotation axis 2a. In this case, the spreading device 8 is held in the pivot axis 19a by means of the holding device 19 on the headband 17. The headband 17 is attached to the brake carrier 6.

The spring element 22 is formed here symmetrically to the longitudinal center line of the opening 9 and bent biased around the pivot axis 19a around. The spring element 22 is in operative connection with two opposing limb parts 20 ', 21 of the spreading device 8 and will be explained in more detail below.

The leg parts 20, 20 '; 21, 21 'are each connected to a transmission section 20e, 20'e; 21 e, 21 'e with grooves 4c in opposite, lateral edge regions of an upper side of the lining carrier plates 4 of the brake linings 3, 3' into engagement. The grooves 4 c extend in a longitudinal axis of the lining carrier plate 4 and are formed from the top side into the material of the lining carrier plate 4. The edge regions in which the grooves 4c are formed, for example, can also be formed projecting upwards. The transmission sections 20e, 20'e; 21 e, 21 'e of the leg parts 20, 20'; 21, 21 'are designed here circular cylindrical, so that sliding in the grooves 4c of the lining carrier plates 4 of the brake pads 3, 3' when applying and releasing the brake is easily possible. In this case, a spread of the brake linings 3, 3 'after release of the brake is possible by the resulting when tightening, preferably additional bias of the spring element 22.

The spreading device 8 engages in the upper region of the lining carrier plates 4 of the opposing brake linings 3, 3 'with the same effect against the tightening direction. In this way, the brake pads 3, 3 'are acted upon by the rear sub-assembly simultaneously with restoring forces.

The spreader 8 will be explained in more detail below. FIG. 3 shows a schematic perspective view of a retaining clip 17 of the first exemplary embodiment of the rear part device according to FIG.

The retaining clip 17 serves to fasten the spreader 8 to the brake carrier 6. The retaining clip 17 is therefore stationary.

The bracket 17 comprises a central portion 17a in a central region of the opening 9. The central portion 17a centered in front of the holding portion 14 of the application section 1 1 of the caliper 1 in the opening 9 between the application-side brake pad 3 and a zuspannseitigen edge of the opening 9. At the central portion 17a is followed on each side an obliquely downward in the direction of the brake disc axis 2a pointing arm portion 17b, 17'b, each parallel to the imaginary longitudinal center line of the opening 9 to shortly before the respective inner edge of the associated tension strut 13 of Caliper 1 runs. Thus, the retaining bracket 17 extends from the center of the opening 9 forth on both sides in each case up to a Bremsträgerhorn 6c, 6'c of the lining shaft of the application-side brake pad. 3

At each end of each arm section 17b, 17'b, there is respectively attached an end leg 17c, 17'c which is bent downward by approximately 90 [deg.] To the respective associated arm section 17b, 17'b and onto the respective brake carrier horn 6c. 6'c tapers. Each end leg 17c, 17'c has an outward facing at its free end, i. to the respective tie rod 13 toward, bent attachment portion 17d, 17'd on. Each attachment portion 17d, 17'd is fixed to the brake carrier 6. This attachment may be different, e.g. screwed, riveted, welded, inserted into a hole or hole and fixed, or the like.

The headband 17 may for example be made of a stable stamped and bent part made of metal. A cross-section of the retaining clip 17 is here rectangular, with the long sides of the rectangular cross-section extending in the direction of the brake disc axis of rotation 2a.

The headband 17 is also provided with a holding device 19, which is attached to the central portion 17a. For this purpose, the central portion 17a in this example, two holding portions 18, 18 ', which here as bushings, for example, rolled bushings, formed and each at one end of the central portion 17a on the side of the central portion 17a, which faces the brake disc 2, are attached. The sockets are each provided with an opening, the longitudinal axis of which runs parallel to the brake disk axis of rotation 2 a and points to the brake disk 2.

The holding device 19 comprises an axle body 19b with the pivot axis 19a, two arm sections 19c, 19'c, two further arm sections 19d, 19'd and two fastening sections 19e, 19'e.

The axle body 19b, the arm portions 19c, 19'c, 19d, 19'd and the attachment portions 19e, 19'e form here a kind of wire hanger.

The axle body 19b with the pivot axis 19a extends in the installed state of the rear part perpendicular to the disc rotation axis 2a and is through holes 20a, 21a of superimposed central portions 20b, 21b of the spreader 8 of the leg portions 20, 20 '; 21, 21 'arranged through. The axle body 19b in this way forms an axis for the spreader 8 (see FIG. 1).

At each end of the axle body 19b, a first arm portion 19c, 19'c is respectively attached. The first arm portions 19c, 19'c are parallel to the brake disk rotation axis 2a, parallel to each other and perpendicular to the

Pivot axis 19a. In this way, the axle body 19b, together with the first arm portions 19c, 19'c, form a U-shaped support for the spreader 8. Each free end of these first arm portions 19c, 19'c merges into a second arm portion 19d, 19'd, respectively , In this case, the second arm portions 19d, 19'd extend at right angles to the first arm portions 19c, 19'c and extend respectively from the first arm portions 19c, 19'c to the left and right parallel to the imaginary longitudinal center line of the opening 9. Here are the connections between the first and second arm portions 19c, 19'c; 19d, 19'd are configured so that the second arm portions 19d, 19'd lie in a plane which is perpendicular to the pivot axis 19a through the center thereof.

Each free end of the second arm portions 19d, 19'd is connected to a respective fastening portion 19e, 19'e. The attachment portions 19e, 19'e are perpendicular to the second arm portions 19d, 19'd, parallel to each other and parallel to the disc rotation axis 2a. The free ends of the fixing portions 19e, 19'e are respectively inserted into the opening of one of the holding portions 18, 18 'of the central portion 17a of the holding bracket 17. In this way, the holding device 19 is mounted together with the spreader 8 on the stationary headband 17.

The holding device 19 is here made of a metal wire as a bent part and is referred to as a connecting wire. Of course, other designs, in one piece or in several pieces with different profiles and thicknesses, are also possible.

In this case, the spreader 8 forms with the headband 17 (headband 27, see Figure 7) insofar a centering device for the caliper 1, as the brake carrier 6, to which the headband 17 is fixed, forms a stationary part, mounted relative to the caliper 1 slidably is, so that after releasing the brake and spreading the spreader 8, ie a pressing apart of the brake pads 3, 3 ', the caliper 1 is guided in a centered position.

FIG. 4 shows a schematic perspective view of the spreading device 8 of the first embodiment of the rear part device according to FIGS. 1 and 2. Here, the view from the direction of the tightening section 11 of the caliper 1 according to FIG.

The portions of the leg portions 20, 20 '; 21, 21 'and the spring element 22 of the spreader 8, which are located on the side of the saddle back 12 (see Figure 1) and the back-side brake pad 3', have reference numerals with an apostrophe for better distinction.

The leg parts 20, 20 '; 21, 21 'each form together with the associated central portion 20b, 21b a scissor arm of the spreading device 8. The scissor arms are symmetrical and arranged symmetrically in the assembled state.

Thus, the one scissor arm, which extends diagonally (see FIG. 2) between the outlet-side end of the application-side brake pad 3 and the inlet-side end of the back-side brake pad 3 ', has an application-side leg part 20 and a back-side leg part 20'. In speaking manner, the other scissor arm, which extends diagonally (see Figure 2) between the inlet end of the application-side brake pad 3 and the outlet end of the back-side brake pad 3 ', a zuspannseitigen leg portion 21 and a back-side leg portion 21'.

The center of a respective scissor arm is formed by the respective circular configured central portion 20b, 21b with the respective bore 20a, 20b. In this example, a diameter of the circular central portion 20b, 21b is about twice as large as a width of the leg portion 20, 20 '; 21, 21 '. In the assembled state, the central portions 20b, 21b are arranged with their bores 20a, 20b coaxially with one another and with the pivot axis 19a. At each central portion 20b, 21b is diametrically each a first straighter

Leg portion 20c, 20'c; 21 c, 21 'c attached, each at its end via a slight bend or a rounding in each case in a straight, obliquely downwardly extending second leg portion 20d, 20'd; 21 d, 21 'd passes. A length of the second leg portion 20d, 20'd; 21 d, 21 'd corresponds, for example, to in about one and a half times the length of the first leg portion 20b, 20'b; 21b, 21 'b.

At each free end of a respective second leg portion 20d, 20'd; 21 d, 21 'd is a circular-cylindrical transmission section 20e, 20'e; 21 e, 21 'e which extends parallel to the pivot axis 19 a downwards in a length which is approximately four times the thickness of a second leg portion 20 d, 20' d; 21 d, 21 'd corresponds.

The transmission sections 20e, 20'e; 21 e, 21 'e are in the installed state of the rear part device with corresponding grooves 4c of the lining carrier plate 4 of each brake pad 3, 3' in engagement.

The scissor arms of the spreading device 8 are connected to the spring element 22 and biased such that one scissor arm with the thighs 20, 20 'pivots about the pivot axis 19a in the counterclockwise direction and the other scissor arm with the leg portions 21, 21' about the pivot axis 19a pivots clockwise. In other words, by the bias of the spring element is a distance of the application-side transmission sections 20e, 21 e to the back-side transmission sections 20'e, 21 'e in Direction of the brake disk axis of rotation 2a increases. In this way, when the rear part is installed by means of the leg parts 20, 21, a compressive force is exerted on the lining carrier plate 4 of the application-side brake pad 3 in the direction of the brake disk axis 2a away from the brake disk 2 toward the application section 11 of the caliper 1, wherein by means of the other Leg parts 20 ', 21' an opposing pressure force on the lining carrier plate 4 of the back-side brake pad 3 'in the direction of the brake disc axis 2a of the brake disc 2 pioneering the saddle back 12 of the caliper 1 out is exercised.

The scissor arms of the spreader 8 here have a rectangular cross-section, wherein the long sides of this rectangular cross-section perpendicular to the pivot axis 19a extend. In this way, a high bending stiffness transversely to the respective longitudinal direction of a scissor arm is made possible, whereby the scissor arms with their leg portions 20, 20 '; 21, 21 'can not significantly deform during operation due to this rigidity.

The spring element 22 comprises a central portion 22a and two spring arms. Each spring arm has two spring sections 22b, 22'b; 22c, 22'c on.

The central portion 22a is formed in the shape of an arcuate portion, wherein this arcuate portion corresponds in an untensioned state about a quarter circle arc. At each end of the central portion 22a is mounted a spring arm having a straight first spring portion 22b, 22'b. The first spring sections 22b, 22'b each pass at their ends in a slight bend or bend into a respective second straight spring section 22c, 22'c. The second spring sections 22c, 22'c each extend slightly obliquely downwards. At the free ends of each second spring portion 22c, 22'c, an end bent or bent down by about 90 ° is mounted as a connecting portion 22d, 22'd.

When installed, the spring element 22 above the leg portions 20, 20 '; 21, 21 'arranged. The connecting portions 22d, 22'd of the spring element 22 are respectively inserted into a bore 20'f, 21f of the leg portions 20 ', 21. The bores 20'f, 21f are respectively formed in the second leg portion 20'd, 21d and are each approximately in the middle of an imaginary longitudinal axis of the respective second leg portion 20'd, 21 d. The central portion 22a is in the installed state of the spring element 22 about the pivot axis 19a around at a distance from the pivot axis 19a, which is approximately the radius of the central portion 20b of the upper scissor arm. In this case, the central portion 22a of the spring element 22 is located on the opposite side of the leg portions 20 ', 21 with which the spring arms are connected. In this way, the spring element 22 extends with its first spring section 22b through the holding device 19, as can be clearly seen in FIG.

The operation of the rear part device will be described below. The headband 17 is fixedly connected to the brake carrier 6, that is mounted stationary. The holding device 19 is inserted into the sockets of the holding sections 18, 18 'on the mounting bracket 17 and can be displaced in the direction of the brake disk axis of rotation 2a, but only with an increased expenditure of force. In this case, the connection between the holding sections 18, 18 'and the fastening sections 19e, 19'e of the holding device 19 is designed as a frictional pairing with a frictional resistance such that an adhesive frictional force of this frictional pairing is smaller than the required displacement force in the direction of the brake disk axis 2a during clamping the disc brake 10 for a displacement of the spreader 8, and that the static friction of the Reib- pairing the restoring force of the spring element 22 of the spreader 8 and thus also the saddle displacement force safely exceeds. The displacement force is thus sufficiently high for displacing the pivot axis 19a of the spreading device 8, wherein the restoring force required for re-dividing the brake linings 3, 3 'is lower and can not cause any displacement due to the high frictional resistance. A displacement along the disc rotation axis 2a is a few millimeters depending on the accuracy of the embodiment.

The scissor arms of the spreading device 8 are pivotally mounted on the axle body 19b of the holding device 19 via the bores 20a, 21a of their central sections 20b, 21b with as little radial play as possible. The transmission sections 20e, 20'e; 21 e, 21 'e are with the grooves 4 c of the pad back plates 4 of the brake pads 3, 3' in engagement. A center point of the spreading device 8, ie its pivot axis 19a with the pivot point or pivot point of the scissor arms is approximately centrally above the brake disk 2 between the brake pads 3, 3 ', ie arranged in the center of the opening 9 of the caliper 1. Now, if the disc brake 10 is actuated by means of the application device, so that a clearance between the friction linings 5 and the brake disc 2 is overcome, the spreading device 8 is such that its above-mentioned rotation or pivot point geometrically centered between the two brake linings. 3 , 3 'lies. In this way, a centering of the rear part device or the spreader 8 during the application of the disc brake 10. In this case, the holding device 19 is moved in the holding portions 18, 18 'of the retaining clip 17. The required force is created by the tension of the disc brake 10 during their actuation. This force is sufficiently high for displacing the pivot axis 19a of the spreading device 8, wherein the restoring force required for re-dividing the brake linings 3, 3 'is lower. At the same time, the spring element 22 is tensioned towards each other by the movement of the lining carrier plates 4 of the brake linings 3, 3 '.

When releasing the disc brake 10, the spring element 22 is relaxed and pushes the scissor arms with their scissor ends, i. the transmission sections 20e, 20'e; 21 e, 21 'e and thus the lining carrier plates 4 engaged therewith, i. the brake pads 3, 3 ', also apart. Because the

Pivot axis 19a of the holding device 19 with the scissors rotation

/ pivot point of the spreader 8 is stationary relative to the brake carrier 6 and the restoring action of the spring element 22 of the spreader 8 is not sufficient to move this / this pivot axis 19a / rotation or pivot point, remove the brake pads 3, 3 'by the same Shift amount of the brake disc 2. The back-side brake pad 3 'thus also shifts the caliper. 1

If the center of the distance between the brake pads 3, 3 'relative to the brake carrier 6 in the engaged state of the disc brake 10 moves (for example, due to uneven wear), the positioning of the scissor center, i. the pivot axis 19a, at a next Zuspannvorgang.

A guide of the transmission sections 20e, 20'e; 21 e, 21 'e of the scissor arm of the spreading device 8 in the grooves 4 c of the lining carrier plates 4 of

Brake pads 3, 3 'makes it possible that the scissor arms can not lift off from the lining carrier plates 4. FIG. 5 shows a schematic perspective view of a variant of the spreading device 8 of the first exemplary embodiment of the rear part device according to FIGS. 1 and 2. FIG. 6 shows an enlargement of the region of the pivot axis 19a.

The spreader 8 in the variant according to FIGS. 5 and 6 comprises two scissor arms each with two leg parts 23, 23 '; 24, 24 'having respective central portions 23a, 24a, leg portions 23b, 23'b; 24b, 24'b, cranks 23c, 23'c; 24c, 24'c, arcuate portions 23d, 23'd; 24d, 24'd, printing sections 23e, 23'e; 24e, 24'e with pressure surfaces 23f, 23'f; 24f, 24'f and a spring element 25.

The scissor arms are as in the first embodiment of Figure 1 and 2 against each other about the pivot axis 19a pivotally. The reference numerals with apostrophe indicate here the sections which are arranged on the side of the saddle back 12 of the caliper 1 out.

In contrast to the first exemplary embodiment described above, in this variant only the leg sections 23b, 23'b; 24b, 24'b, which are diametrically attached to the central portions 23a, 24a, formed straight. At the ends of the leg portions 23b, 23'b; 24b, 24'b are the cranks 23c, 23'c; 24c, 24'c attached, which then in each case with the curved down bow portions 23d, 23'd; 24d, 24'd are connected. The free ends of the arcuate portions 23d, 23'd; 24d, 24'd are as bent pressure sections 23e, 23'e; 24e, 24'e with the pressure surfaces 23f, 23'f; 24f, 24'f trained.

The cranks 23c, 23'c; 24c, 24'c are connections between the straight leg portions 23b, 23'b; 24b, 24'b and the downwardly bent arcuate portions 23d, 23'd; 24d, 24'd arranged in a plane in which the pivot axis 19a extends. In contrast, the cranked pressure sections 23e, 23'e; 24e, 24'e in a plane which is spanned at right angles to the pivot axis 19a.

The cranks 23c, 23'c of the above-arranged scissor arm extend downward, whereas the cranks 24c, 24'c of the lower scissor arm extend upward. Thereby, it is possible that the printing sections 23e, 23'e; 24e, 24'e lie in a common plane. The pressure surfaces 23f, 23'f; 24f, 24'f of the printing sections 23e, 23'e; 24e, 24'e point outwardly, ie away from the imaginary longitudinal center line of the opening 9 of the caliper 1 when installed. Namely, the pressure surfaces 23f, 24f to the application section 1 1 of the caliper 1, wherein the pressure surfaces 23'f, 24'f to saddle back 12 of the caliper 1 point.

In the installed state, the application-side pressure surfaces 23f, 24f are in contact with an upper portion of the lining side 4a of the lining carrier plate 4 of the application-side brake lining 3, whereas the back-side pressure surfaces 23'f, 24'f in the same way with an upper portion of the lining side 4a of the lining carrier plate 4 of the back-side brake pad 3 'are in contact. This is not shown, but is easily imaginable with reference to FIG.

This means that the pressure sections 23e, 23'e; 24e, 24'e with the pressure surfaces 23f, 23'f; 24f, 24'f when the brake linings 3, 3 'return to the covering side 4a of the respective lining carrier plate 4 exert a compressive force, which is generated by the spring element 25, as described above in the first embodiment. In contrast to the first embodiment, the spring element 25 is formed in the variant of Figure 5 and 6 as a coil spring. The coil spring is arranged around a cylindrical body 26 which is located between the central portions 23a and 24a. This body 26 may e.g. a bushing, through which the axle body 19b of the holding device 19 according to Figure 1, 2 and 3 extends. In this case, then the central portions 23a and 24a are provided with a bore as in the first embodiment, which is not shown in Figure 5 and 6, but is easy to imagine.

The spring member 25 is in contact with an uppermost spring end 25a with one side of the upper scissor arm (e.g., leg portion 23b). Another, lower end (not shown, but easily conceivable) of the spring element 25 is in contact with the lower scissor arm.

FIG. 7 shows a schematic perspective view of a second embodiment of the rear part device. FIG. 8 shows a schematic partial sectional view of the disc brake 10 according to the invention according to FIG. 1 with the second exemplary embodiment of the rear part device according to FIG. The second embodiment differs from the first embodiment of the rear part in that the spreader 8 has a different headband 27. The second exemplary embodiment in FIG. 7 also shows that the spreading device 8 is designed according to the variant according to FIG. 6 and another holding device 28 is provided.

The mounting bracket 27 includes a slightly curved central portion 27a. At the central portion 27a is followed on each side by an approximately 45 ° downwardly extending arm portion 27b, 27'b. At the free end of these two hanger arms 27b, 27'b is in each case a circular attachment portion 27c, 27'c attached with an opening. The left attachment portion 27'c is not fully shown in FIG. 7, but is easily conceivable.

Thus, the mounting bracket 27 extends in the installed state with its arm portions 27b, 27'b on both sides in each case up to the bearing receivers 6b of the brake carrier 6 on its mounting side 6a (see Figure 8). When installed, the fastening sections 27c, 27'c are arranged with their openings coaxial with the respective bearing receptacles 6b of the brake carrier 6 between the guide rails 32 and the fastening side 6a of the brake carrier 6.

In the embodiment according to FIG. 7, the upper edges of the yoke arms 27b, 27'b are provided with a stiffening section 27d, 27'd via their connecting sections to the central section 27a, in each case a horizontal support 27e in their end regions over the ends of the central section 27a , 27'e, eg in the form of an angle bracket, is attached. These supports 27e, 27'e serve for connection to the holding ends 28c, 28'c of each holding arm 28b, 28'b of the holding device 28 resting thereon.

The holding device 28 is U-shaped and comprises a holding section 28a, the ends of which are bent over in each case into one of the holding arms 28b, 28'b with the holding ends 28c, 28'c. The holding section 28a lies in a plane parallel to a plane of the brake disk 2, wherein the holding arms 28b, 28'b extend at right angles thereto and parallel to one another. Here, the holding arms 28b, 28'b are integrally formed with the holding portion 28a and therefore each twisted about its longitudinal axis by 90 °. As a result, the holding ends 28c, 28'c lie in the same plane as the supports 27e, 27'e on the holding device. bracket 27. The holding ends 28c, 28'c are here in each case fixedly connected to the supports 27e, 27'e by a fastening element 28d, 28'd, eg rivets.

On the underside of the holding portion 28a of the holding device 28, a holder 29 is mounted in the form of a tab on which an axle body 29b is mounted with a pivot axis 29a. The axle body 29b is circular cylindrical and extends from the holder 29 through the lower central portion 24a of the lower scissor arm, through the spring member 25 formed as a coil spring, and through the upper central portion 23a from which it protrudes and has a pin as a fuse 29c , which secures the spreader 8 axially on the axle body 29b. The central sections 23a, 24a each have a bore which communicates with the axle body 29b. The pivot axis 29a of the axle body 29b is here also the pivot axis 19a of the spreading device 8 (see FIG. 5).

The retaining clip 27 and also the retaining device 28 may e.g. are produced as stamped and bent parts, wherein suitable measures may be provided for the stiffening, such. Stiffeners and beads and the like. In Figure 8 it is shown how the headband 27 of the rear part means with its mounting portions 27c, 27'c and the openings as already mentioned above coaxial with the bearing receivers 6b for the attachment of the guide rails 32 by means of bearing screws 33 between the guide rails 32 and the mounting side 6a of the Brake carrier 6 is arranged.

The thrust bearing 30 shown in Figure 8 comprises a bearing portion 31 as part of the caliper 1, the guide rail 32, the bearing screw 33 and a between the guide rail 32 and the bearing portion 31 arranged bearing element 34, e.g. a thrust bearing bush.

The rear part device with the spreading device 8 and the retaining clip 27 according to the second exemplary embodiment according to FIG. 7 can also be used as a retrofitting part, e.g. be installed in a disc brake 10 when covering change and / or maintenance. This is possible in a simple manner, since the headband 27 with the spreader 8 according to Figure 7 only has to be used later, without making any changes.

The above-described scissor arms of the spreader 8 are all of the same length, ie the pivot axis 19a, 29a of the spreader 8 are located. det exactly in the middle of the opening 9. In this way, both brake pads 3, 3 'are moved by the same path. However, together with the back-side brake pad 3 'and the caliper 1 must be moved, which of course is associated with a higher expenditure of force. In order to take into account the resulting different elastic deformation of the scissor arms, the spreader 8 may for example also be designed asymmetrically. The scissor arms, for example, different length leg portions 20, 20 '; 21, 21 '; 23, 23 '; 24, 24 ', wherein the pivot axis 19a, 29a of the spreading device 8 is not arranged in the center of the opening 9.

The invention is not limited by the embodiments described above. It is modifiable within the scope of the appended claims. For a fixation of the spreader 8, other solutions are conceivable. So it is e.g. possible that the friction points between the holding portions 18, 18 'of the retaining clip 17 and the mounting portions 19e, 19'e of the holding device 19 are provided with an adhesive which is activated during the first movement and then hardens. As a result, a stable and no longer movable positioning can be achieved, which, however, can not be changed.

In addition, it could also be possible for the holding device 28 (see FIG. 7) to be provided with a deformable element. The spreading device 8 is connected directly to this deformable element. This deformable element could be, for example, the holding section 28a or one or more sections of the holding section 28a of the holding device 28. When applying the disc brake 10, the said element would permanently deform plastically (see Figure 7).

It is also conceivable that in the second embodiment of the rear part of Figure 7, the holding portions 18, 18 ', the holding device 19 and the scissor arms of Figure 1, 2, 3 and 4 can be used with the headband 27.

The transmission sections 20e, 20'e; 21 e, 21 'e of the spreader 8 of the first embodiment and the engaging with them grooves 4 c of the lining carrier plates 4 of the brake pads 3, 3' may also be formed in geometric reversal. That is, the ends of the leg portions 20d, 20'd; 21 d, 21 'd can have grooves, which in turn with the protruding from the lining carrier plates 4 noses, pins, domes or the like. engage. It is also conceivable that not only a spring element 22, 25 is provided, but also two, several or spring elements 22 and 25 in combination.

LIST OF REFERENCE NUMBERS

1 caliper

2 brake disc

2a brake disc rotation axis

3, 3 'brake pad

4 lining carrier plate

4a lining side

4b print side

4c groove

4d lead

5 friction lining

6 brake carrier

6a attachment side

6b bearing mount

6c, 6'c Bremsträgerhorn

7 pad retaining spring

8 spreading device

9 opening

10 disc brake

1 1 clamping section

12 Saddleback

12a holding section

13 tension strut

14, 15 holding section

16 lining retainer

17 retaining bracket

17a central section

17b, 17'b arm section

17c, 17'c end legs

17d, 17'd mounting section

18, 18 'holding section

19 holding device

19a pivot axis

19b axle body

19c, 19'c; 19d, 19'd arm section

19e, 19'e attachment section

20, 20 '; 21, 21 'leg part

20a, 21 a bore 20b; 21 b central section

20c, 20'c; 21 c, 21 'c leg portion 20d, 20'd; 21 d, 21 'd leg portion 20e, 20'e; 21 e, 21 'e transmission section 20'f, 21 f bore

22 spring element

22a central section

22b, 22'b; 22c, 22'c spring portion 22d, 22'd connecting portion 23, 23 '; 24, 24 'leg part

23a, 24a central section

23b, 23'b; 24b, 24'b leg portion 23c, 23'c; 24c, 24'c crank

23d, 23'd; 24d, 24'd arc section 23e, 23'e; 24e, 24'e printing section 23f, 23'f; 24f, 24'f printing area

25 spring element

25a end of spring

26 bodies

27 retaining bracket

27a central section

27b, 27'b arm portion

27c, 27'c attachment portion 27d, 27'd stiffening portion 27e, 27'e support

28 holding device 28a holding section

28b, 28'b holding arm

28c, 28'c end of stay

28d, 28'd fastener 29 holder

29a pivot axis

29b axle body

29c fuse

30, 30 'thrust bearing

31 bearing section 32 guide rail

33 Bearing screw

34 bearing element AS outlet side ES inlet side

Claims

claims

1 . Disc brake (10) for a commercial vehicle, having a brake caliper (1) which engages over a brake disc (2) and is designed as a sliding caliper, which is fastened to a stationary brake carrier (6) and has a central opening (9) over the brake disc (2). has, in the brake caliper (1) arranged, oppositely movable, each having a lining carrier plate (4) and a friction lining (5) mounted thereon brake pads (3, 3 '), of which an onionseite or zuspannseitiger brake pad (3) by means of An application device can be pressed against the brake disk (2) via at least one brake piston, and at least one rear part device, with which the brake caliper (1) can be returned after a brake-induced displacement and release of the brake, wherein the rear part device adjoins one another Brake linings (3, 3 ') attacking, opposite to the respective Zuspannrich- same acting spreader (8) with at the respective Belagtr having an extension plate (4), wherein the spreading device (8) is arranged in the central opening (9),

characterized in that

the spreading device (8) is designed in the manner of a pair of scissors and has at least two scissor arms as spreading elements and at least one spring element (22, 25).

2. Disc brake (10) according to claim 1,

characterized in that

the at least two scissor arms of the spreading device (8) are pivotable relative to one another about a pivot axis (19a, 29a) which is arranged in the middle of the opening (9) perpendicular to a brake disk rotation axis (2a).

3. Disc brake (10) according to claim 2,

characterized in that

the at least two scissor arms of the spreading device (8) about the pivot axis (19a, 29a) by means of the spring element (22, 25) against the respective application direction of the brake pads (3, 3 ') are biased.

4. Disc brake (10) according to one of the preceding claims, characterized in that

each scissor arm is formed in each case from two identical limb parts (20, 20 ', 21, 21', 23, 23 ', 24, 24'), the respective two identical limb parts (20, 20 '; 21, 21'; 23 ', 24, 24') in each case via a common center 21a, 21 "e, 23e, 23'e, 24e, 24'e) for cooperation with each other the respective lining carrier plate (4) are provided.

5. Disc brake (10) according to claim 4,

characterized in that

the transfer sections (20e, 20'e; 21e, 21'e) are in engagement with grooves (4c) in opposite, lateral edge regions of the lining carrier plates (4) of the brake linings (3, 3 ').

6. Disc brake (10) according to claim 5,

characterized in that

the transmission sections (20e, 20'e; 21e, 21'e) are circular-cylindrical.

7. Disc brake (10) according to claim 4,

characterized in that

the transfer sections (23e, 23'e; 24e, 24'e) have pressure surfaces (23f, 23'f; 24f, 24'f), each with a portion of lining sides (4a) of the lining carrier plates (4) of the brake linings (3, 3 ') are in contact.

8. Disc brake (10) according to one of the preceding claims, characterized in that

the spreading device (8) has a stationary holding bracket (17, 27) with a holding device (19, 28) for the scissor arms.

9. Disc brake (10) according to claim 8,

characterized in that

the stationary retaining bracket (17, 27) on the brake carrier (6) is fixedly mounted.

10. Disc brake (10) according to claim 9,

characterized in that

the stationary retaining bracket (17, 27) is arranged between an application-side edge of the opening (9) and the application-side brake pad (3).

1 1. Disc brake (10) according to claim 9 or 10,

characterized in that

the stationary retaining clip (17) comprises a central section (17a, 27a) and arm sections (17b, 17'b; 27b, 27'b) adjoining on both sides thereof, wherein fixing portions (17d, 17'd; 27c, 27'c) of the arm portions (17b, 17'b; 27b, 27'b) are fixed to the brake carrier (6).

12. Disc brake (10) according to claim 1 1,

characterized in that

the fastening portions (27c, 27'c) of the retaining clip (27) each having an opening and coaxial with bearing seats (6b) of the brake carrier (6) for attachment of guide rails (32) by means of bearing screws (33) between the guide rails (32) and a fastening side (6a) of the brake carrier (6) are arranged such that the headband (27) is fixedly secured to the brake carrier (6).

13. Disc brake (10) according to any one of claims 8 to 1 1,

characterized in that

the holding device (19, 28) comprises an axle body (19b, 29b) with the pivot axis (19a, 29a).

14. Disc brake (10) according to claim 13,

characterized in that

the holding device (19) as a kind of wire hanger with the axle body (19b), arm portions (19c, 19'c, 19d, 19'd), which carry the axle body (19b), and fastening portions (19e, 19'e), with which is the axle body (19b) and the arm portions (19c, 19'c, 19d, 19'd) attached to the headband (17) is formed.

15. Disc brake (10) according to claim 13,

characterized in that

the holding device (28) is U-shaped and has a holding section (28a) whose ends are each connected to a holding arm (28b, 28'b), wherein the axle body (29b) is fastened to the holding section (28a) , and wherein the holding arms (28b, 28'b) are attached to the headband (29).

16. Disc brake (10) according to claim 14 or 15,

characterized in that

the spreading device (8) in the opening (9) is formed centered.

17. Disc brake (10) according to claim 16,

characterized in that the holding device (19) on the retaining bracket (17, 27) in the direction of the brake disc rotation axis (2a) is slidably mounted.

18. Disc brake (10) according to claim 17,

characterized in that

the holding device (19) with fastening portions (19e, 19'e) in bushes on the headband (17, 27) slidably inserted in the direction of the brake disk axis of rotation (2a), said connection between the bushes and the mounting portions (19e, 19'e ) of the holding device (19) is designed as a frictional pairing with a frictional resistance such that an adhesive frictional force of this frictional pairing is smaller than a required displacement force in the direction of the brake disc axis of rotation (2a) during application of the disc brake (10) for displacement of the spreader (8), and that the static friction force of the friction pair reliably exceeds a restoring force of the spring element (22, 25) of the spreading device (8) and thus also a saddle displacement force.

19. Disc brake (10) according to claim 16,

characterized in that

the holding device (28) has at least one deformable element to which the spreading device (8) is directly connected, wherein the at least one deformable element permanently deforms plastically when the disk brake (10) is tightened.

20. Disc brake (10) according to claim 18,

characterized in that

the at least one deformable element is formed from the holding section (28a), from a section of the holding section (28a) or from a plurality of sections of the holding section (28a) of the holding device (28).

21. Disc brake (10) according to one of the preceding claims, characterized in that

the spring element (22) comprises a central portion (22a) and two spring arms, wherein the spring element (22) is symmetrical to a longitudinal center line of the opening (9) and biased around the pivot axis (19a), and wherein the one spring arm the spring element (22) is in operative connection with a leg part (20 ') of the one scissor arm, and wherein the other spring arm of the spring element (22) is connected to one leg part (20 ') opposite leg portion (21) of the other scissor arm is in operative connection.

22. Disc brake (10) according to one of the preceding claims, characterized in that

the spring element (25) is formed as a spiral spring, wherein a spring end (25a) of the spring element (25) is in contact with one side of the one scissor arm, and another spring end of the spring element (25) is in contact with the other scissor arm.

23. Disc brake (10) according to claim 21,

characterized in that

the spring element (25) is arranged between the central sections (20a, 21a, 23a, 24a) of the scissor arms.

24. Disc brake (10) according to one of the preceding claims, characterized in that

the scissor arms of the spreading device (8) have a rectangular cross-section, wherein the long sides of this rectangular cross-section extend at right angles to a pivot axis (19a) of the scissor arms.

25. Disc brake (10) according to one of the preceding claims, characterized in that

the central region of the opening (9) on either side of a virtual center of the opening (9) approximately parallel to the plane of the brake disc (2) in one

Length in a range of 30 to 50% of a longitudinal axis of the opening (9) extends.

26. Brake lining set for a disc brake (10) according to one of the preceding claims, comprising at least two brake linings (3, 3 ') each having a lining carrier plate (4), one on the lining carrier plate (4) mounted friction lining (5), and a rear part device with a spreading device (8) which acts on the opposing brake linings (3, 3 ') and acts counter to the respective application direction of a disc brake (10) to be assigned with spreader elements acting on the respective lining carrier plate (4),

characterized in that

the lining carrier plates (4) each have a groove (4c) in opposite, lateral edge regions of an upper side, wherein the grooves (4c) in one Longitudinal axis of the lining carrier plate (4) and from the top in the material of the lining carrier plate (4) are eingefornnt.