Disc brake for a commercial vehicle and brake pad set

Abstract

Disc brake (100) for a commercial vehicle, comprising a brake caliper (1) designed as a sliding caliper that overlaps a brake disc (2), is attached to a stationary brake carrier (6) and has a central opening (41) above the brake disc (2), two brake linings (3) arranged in the brake caliper (1) that are movable in opposite directions, each having a lining carrier plate (4) and a friction lining (5) attached thereto, one of which, on the action side, can be pressed against the brake disc (2) by means of a clamping device via at least one brake piston, and at least one return device with which the brake caliper (1) can be returned after a braking-induced displacement and release of the brake, wherein the return device has a spreading device (8) acting on the opposing brake linings (3) and acting in the same way opposite to the respective clamping direction, with spring-loaded spreading elements acting on the respective lining carrier plate (4),wherein the spreading device (8) is arranged in the central opening (41), and wherein the spreading device (8) comprises spring arms (20) as the resilient spreading elements, characterized in that the spring arms (20) are connected to a retaining arc (21) which is attached to the brake carrier (6), wherein the retaining arc (21) is connected to two brake carrier horns (25) which define a lining channel, wherein the ends of the spring arms (20) are each designed as a downwardly bent fastening section (20a), wherein each fastening section (20a) is received from above in a receiving hole (4a) at each end region of a lining carrier plate (4), whereby the spreading device (8) transmits its spreading forces between each fastening section (20a) in the associated receiving hole (4a) to the respective lining carrier plates (4).

Description

[0001] 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.

[0002] In a disc brake of this type, also known as a sliding caliper brake, a clamping device, which can be pneumatically or electrically actuated, presses an action-side brake pad against a vehicle-side brake disc during braking. As the braking process continues, the brake caliper, relative to the brake disc, is moved in the opposite direction to the clamping direction of the action-side brake pad, thereby engaging and pressing the opposite, reaction-side brake pad against the other side of the brake disc.

[0003] After the brake is released, the brake caliper of a conventional disc brake remains in a position where the brake pads, or at least the brake pad on the reaction side, are in contact with the brake disc without pressure, but still rubbing against it. The resulting residual friction torque of the brake pads during driving has a detrimental effect, leading to increased fuel consumption and a reduction in the service life of the components involved, namely the brake disc and the brake pads.

[0004] While a slight loosening of the brake pads occurs during driving, for example due to runout of the brake disc as well as vibrations and lateral accelerations during cornering, these effects are not sufficient to effectively prevent the aforementioned residual friction torques.

[0005] To address this problem, a disc brake is disclosed in generic DE 10 2007 001 213 A1 with a return device which is arranged in one of the guide arms by which the brake caliper is slidably held on the brake carrier and which has a spring-loaded return element by which the brake caliper is moved into a starting position.

[0006] In principle, this design has proven successful. However, the use of this known reset device with pneumatically actuated disc brakes on heavy commercial vehicles can lead to problems, as there are wide limits of variable influences due to component tolerances and deformations, which do not guarantee the reliable function of this reset device in every case.

[0007] Similar problems arise with a disc brake as described in DE 10 2012 006 111 A1. In this design, a return mechanism is arranged on the side opposite the clamping device and facing the brake pad on the reaction side, thereby achieving effective, and in particular automatic, return of the brake caliper while minimizing the impact on system stiffness.

[0008] In any case, the reset mechanism acts on the brake caliper, with the brake carrier acting as a counter-support.

[0009] DE 43 01 621 A1 describes a floating caliper disc brake with a stationary brake carrier having two support arms projecting beyond the outer edge of a brake disc, with brake shoes arranged on both sides of the brake disc, each having a friction lining and a backing plate, which are slidably supported on the support arms, with a floating caliper guided axially slidably on the brake carrier, which encompasses the brake shoes and has an actuating device intended for pressing the brake shoes against the brake disc, with a spring arrangement acting axially on the brake shoes in the brake release direction, which assists in setting a clearance between the brake shoes and the brake disc after braking.The spring arrangement comprises at least one expanding spring which is fixed to a support arm of the brake carrier in an axially immovable manner, the attachment being made to a section of the support arm located above the outer edge of the brake disc, and the expanding spring having at least two spring arms which bear resiliently against the back plates of the brake shoes in an axial direction.

[0010] US2014 / 0339026 A1 describes a spreader spring comprising a locking arm connecting the spreader spring to a brake component, a retraction arm; and a preload device arranged between the locking arm and the retraction arm, wherein the preload device comprises six or more spiral loops that store energy during brake activation and, once the braking process is complete, retract the brake components (brake pads).

[0011] The invention is based on the objective of further developing a disc brake of the generic type in such a way that the service life of the brake pads and the brake disc in particular is increased and the overall operating costs are reduced using the simplest possible design means.

[0012] JP 2010 - 270 799 A describes a method for arranging a return spring for a disc brake device that easily prevents the return spring from popping out or falling off, while minimizing the impairment of function caused by brake pad wear. In the method for arranging a return spring comprising a folded part and an arm part, each positioned in the direction of rotation of a rotor relative to brake pads arranged opposite each other in a disc brake device to separate the brake pads from the rotor, the folded parts in the two return springs are opposite each other. The two return springs are arranged on the brake pads, with the opposing folded parts being connected to each other. Side surfaces of a pad-corresponding part in the brake pads are held by the front ends of the arm parts in the two connected return springs.In addition, an expansion suppression part is provided on a pad clip to prevent excessive expansion of the front ends of the arm parts.

[0013] DE 31 08 113 A1 relates to a partial disc brake with a brake caliper encompassing the edge of a brake disc, two brake pads arranged on either side of the brake disc, and at least one spring element acting on the brake pads. At least one spring element projects with one free end through a recess in the first brake pad carrier into a bore in the brake caliper or piston, extends with a bent section having a spring coil over the brake disc, projects with its other free end through a recess in the second brake pad into a further bore in the brake caliper or piston opposite the first, and is provided with an electrical connection at one free end, with part of the bent section running near the transition from the brake pad to the brake pad carrier.

[0014] US 2013 / 0025981A1 specifies a structure that allows return springs and clamps to be handled as integral parts during assembly, thus simplifying the process. Limiting sections are provided at both axial ends of each clamp. Furthermore, the return springs consist of inner and outer spring elements. These two types of spring elements are helical torsion springs with helical sections. Stop sections are provided on each spring element. The stop sections are pressed against the inner surfaces of the limiting sections by elastic restoring forces. In addition, the central axes of the helical sections are substantially aligned with the direction of rotation of the rotor.

[0015] US 5,549,181 A relates to a retraction mechanism for a disc brake assembly that applies a generally constant return force, pushing the brake shoes apart regardless of the degree of brake pad wear. The disc brake assembly includes an anchor plate on which a brake caliper is slidably mounted. The brake caliper is formed with an inner and an outer leg. A cylindrical recess is formed in the inner leg of the brake caliper in which a piston is slidably mounted. A pair of brake shoes is arranged alongside the inner and outer legs of the brake caliper, and a rotor, connected to a rotating wheel, extends between them. A mechanism is provided to selectively engage the brake shoes with the rotor to slow or stop its rotation.The retraction mechanism comprises a pair of retraction clamps mounted on the anchor plate to spread the brake shoes apart when the disc brake assembly is subsequently released. The retraction clamps are serpentine and have straight sections connected by intervening curved sections. The outer ends of the retraction clamps terminate in upward-projecting post sections and outward-projecting finger sections that engage the brake shoes. The forces exerted on the brake shoes by the retraction clamps are essentially uniform, regardless of the degree of wear on the brake shoe friction linings. Therefore, such forces cannot overcome the pressure of a rollback seal and will undesirably move the piston away from the rotor by a greater distance than a desired predetermined distance.

[0016] The upward-pointing post sections and outward-pointing finger sections are perpendicular to each other, but in the manner of a fork.

[0017] Another task is to provide a suitable set of brake pads.

[0018] This problem is solved by a disc brake having the features of claim 1.

[0019] The further problem is solved by a brake pad set with the features of claim 3.

[0020] A disc brake according to the invention for a commercial vehicle, comprising a brake caliper designed as a sliding caliper that overlaps a brake disc and is attached to a stationary brake carrier and has a central opening above the brake disc, includes two brake linings arranged in the brake caliper that are movable in opposite directions, each having a lining carrier plate and a friction lining attached thereto, one of which, on the action side, can be pressed against the brake disc by means of a clamping device via at least one brake piston, as well as at least one return device with which the brake caliper can be returned after a braking-related displacement and release of the brake, wherein the return device has a spreading device acting on the opposing brake linings, acting in the same way against the respective clamping direction, with spring-loaded spreading elements acting on the respective lining carrier plate.The spreading device is located in the central opening.

[0021] The following feature is not part of the present invention. "...whereby the spreading elements engage directly or indirectly outside the friction linings on one side in the central region or on at least two contact areas of the brake linings arranged at a distance from each other towards the center, wherein the contact areas each have a contact surface and a bearing surface on which the spreading elements are movably arranged."

[0022] The inventive design of the disc brake achieves a synchronous return of both brake pads and a return of the brake caliper when the brake is released, with the synchronicity relating to both the return forces and the return paths. The return force acts against the respective clamping direction of the two brake pads, i.e., towards the back of the caliper for the reaction-side brake pad and towards the caliper head for the action-side brake pad, creating gaps with respect to the brake disc.

[0023] The spreading mechanism engages the two brake pads, preferably on the backing plates, either on the side facing the attached friction lining or on the opposite backing plate. To prevent the brake pad from tilting during retraction, the spreading element engages either centrally at an upper, exposed edge of the backing plate or symmetrically at two contact points on the right and left.

[0024] A brake pad set according to the invention for the disc brake according to the invention comprises at least two brake pads, each with a pad carrier plate and a friction lining attached to the pad carrier plate, and the spreading device specified above.

[0025] The lining carrier plate has, outside the friction linings, a contact surface and a bearing surface on one side in the central area or on at least two contact areas arranged at a distance from each other towards the center (not part of the invention). This offers the advantage of realizing several functions (axial and radial spring force transmission, spring end guidance) in a small space.

[0026] In an embodiment not belonging to the invention, the spreading elements extend from a central area in the middle of the opening from the inside out to the contact areas arranged at intervals from the center. It is also possible for the spreading elements to extend from a central area in the middle of the opening from the inside out to the contact areas arranged at uniform intervals from the center.

[0027] In this way, the spreading device is arranged centrally in the brake caliper, and is also located within an envelope of a rim of an associated wheel.

[0028] The two spreading elements are connected to each other centrally (with respect to the support horns). This ensures that the same spring force – within a small tolerance range – is maintained on both the inlet and outlet sides. Different spring forces between the outlet and inlet sides, which can lead to uneven wear, are minimized by the single-sided engagement of each pad with one spring.

[0029] Another embodiment, not belonging to the invention, provides that the central area of ​​the opening extends on both sides of a virtual center of the opening approximately parallel to the plane of the brake disc for a length of 30 to 50% of a longitudinal axis of the opening. This results in an advantageous adjustment of the spring forces.

[0030] In another embodiment, the spreading device has spring arms. (The following feature is not part of the invention) "...two of which rest against an associated support plate, the spring arms being connected to each other in the central area of ​​the opening, which simplifies installation during assembly and maintenance."

[0031] According to a further aspect of the invention, the spreading device has oppositely acting spreading elements, preferably elastically acting, in particular in the form of spring elements.

[0032] In its simplest form, a compression spring is positioned between the two brake pads, either as a coil or torsion spring. The torsion spring is mounted centrally above the brake disc, for example on a pad retainer bracket, which allows the two brake pads to be pressed into a pad recess under preload. In principle, when using a coil spring, its end connection to the pad backing plates is sufficient to adequately fulfill the spreading function.

[0033] According to a further aspect of the invention, the spreading device is in operative connection with the brake carrier instead of with the pad retaining bracket, which forms a counter-support and in which the brake pads are mounted so as to be slidably aligned with the brake disc.

[0034] For this purpose, according to the invention, a retaining arc is preferably provided which spans the brake disc in the circumferential area, up to the brake carrier horns of the brake carrier which define a pad channel on both sides and is arranged centrally thereto with respect to the thickness of the brake disc.

[0035] In a version not belonging to the invention, the retaining bracket can be connected to two opposing brackets connected to the brake carrier, which allows for easy attachment.

[0036] Alternatively, the retaining bracket can be connected to at least two brake carrier horns of a brake pad shaft, while the spreading elements engaging both brake pads are connected to the retaining bracket. This thus forms a centering device, which, in conjunction with the brake carrier as a fixed bearing, can also be implemented differently in terms of design.

[0037] Not belonging to the invention is the retaining arch, which has a C-shaped contour, a central leg spanning the brake disc to the aforementioned extent, and two end legs angled in the same direction towards the brake carrier horns, one of which is attached to a brake carrier horn of the corresponding pad shaft.

[0038] By means of the retaining bracket, to which the spreading device with its spring arms is attached, the brake caliper is automatically centered after the brake is released, i.e. after a braking process has ended, whereby the fixed positioning of the spreading device causes the brake pads to be reset in such a way that the brake caliper centers itself relative to the brake disc.

[0039] Furthermore, the spreading device is designed to be effective across the entire wear range of the brake pads.

[0040] Since the points of force application on the brake pads change with increasing wear, the functional parts of the spreading device that contact the brake pads are designed in such a way that they slide against the pad carrier plate of the respective brake pads (not part of the invention).

[0041] To ensure a secure hold of the spring legs or, in the case of another design variant of the spring arms not belonging to the invention, even under vibration loads during driving, the spring arms are supported on the upper edge of the pad support plate, relative to the bottom of the pad shaft, also in a sliding manner as described above.

[0042] Furthermore, with appropriate design of the spreading device, the use of pad retaining springs, which, as is known from the prior art, are attached to the upper edge of the pad carrier plates and on which a pad retaining bracket is supported, can be dispensed with, so that the respective brake pad is held under preload in the pad channel of the brake carrier.

[0043] The structural implementation of the spreading device according to the invention can vary in design, with a significant advantage arising from the fact that moving components can essentially be dispensed with, with the exception of the spring-loaded spreading elements, which perform a spring-loaded deflection for their function.

[0044] The now possible elimination of moving parts naturally increases the service life of the spreading device, as does the small number of components required, which also results in extremely cost-effective manufacturing and assembly.

[0045] In a further embodiment not belonging to the invention, each spring arm is formed at its end with a fork-shaped spring end, forming a support leg and a pressure leg. The support leg rests movably on a bearing surface on a narrow side of the pad carrier plate, and the pressure leg rests movably under pressure against a contact surface on the side of the pad carrier plate facing the friction lining. This allows for an advantageous simultaneous functionality, namely that the spring arm can not only transmit compressive forces to the pad carrier plate via the contact surface, but is also guided in its movements by the contact surface and the bearing surface. Furthermore, the brake lining can be held resiliently in its brake lining channel by the spring force introduced into it via the contact surface.

[0046] In another embodiment, which is not part of the invention, the support surface can be arranged at an angle to a horizontal, with the angle being in a range of 3 to 15°.

[0047] In another embodiment, which is also not part of the invention, the contact surface can protrude from the pad carrier plate or be molded into the pad carrier plate. This allows for advantageous adaptation to different brake designs.

[0048] Furthermore, a projection not according to the invention can be provided on the contact surface, wherein the projection extends from the contact surface into a slot between the support leg and the pressure leg. This can enable precise guidance and improved force transmission.

[0049] In an alternative embodiment not belonging to the invention, each spring arm is formed at its end with a spring end and a pressure leg, wherein the pressure leg is in contact with a support section of the side of the pad carrier plate facing the friction lining, wherein the pressure leg rests movably with a contact section under pressure against a contact surface of the support section of the pad carrier plate and simultaneously rests movably with a bearing section on a bearing surface of the support section of the pad carrier plate. In this way, the advantage arises that two functions can be realized in the pressure leg, namely, transmission of spring force in the axial and radial directions to the brake lining while simultaneously guiding the spring end and saving installation space and material.

[0050] In an embodiment not part of the invention, it is preferred that the support section with the contact surface and the bearing surface is molded into the support plate. This is advantageous because it results in a saving of space and material.

[0051] It is also not in accordance with the invention if the contact surface of the contact areas can be arranged at an angle to a horizontal, wherein the angle lies in a range of 3 to 15°. This improves the guidance of the spring end.

[0052] If the non-inventive contact surface protrudes from the support plate or is molded into the support plate, this may allow for advantageous adaptation to different installation situations.

[0053] It is also possible that a non-inventive projection is provided on the contact surface, wherein the projection protrudes from the contact surface. This allows for more precise guidance of the spring end.

[0054] A non-inventive embodiment can be achieved if the contact areas have a support section which is molded into the support plate along with the contact surface and the bearing surface. This results in space and material savings.

[0055] In an embodiment not part of the invention, the contact surface is offset from the side surface of the friction lining plate, which is provided with the friction lining, and extends away from the friction lining. This results in advantageous guidance of the spring end in the friction lining plate, along with spring force transmission in a small installation space. The spreading device comprises two spreading elements, with a first spreading element acting on a first lining and a second spreading element acting on a second lining. The two spreading elements are connected centrally (with respect to the support horns). This ensures that the same spring force – within a small tolerance range – is maintained on both the inlet and outlet sides. Different spring forces between the outlet and inlet sides, which can lead to uneven wear, are minimized by the single-sided engagement of one spring per lining. - Uniform force application by the springs on both the action and reaction sides, or on the pressure piece and saddle sides, can be achieved through flexible adjustment of the center bridge. Furthermore, the flexible center bridge can compensate for minor geometric misalignments of the disc, lining, and carrier. - The central bridge allows for easy positioning of the active retraction mechanism, which is then held in place by the pad retaining bracket. A key advantage is that the retraction mechanism can be easily removed and replaced when changing the pad. By utilizing the entire pad space between the support horns, spreading elements or springs with a very low spring rate can be used to apply fairly constant forces as the pad wears. The long spring travel allows the spreading elements to be tolerant of varying spring forces. This results in a constant spring rate with low tolerances. - In a non-inventive embodiment, only two springs are used. - The spreading elements can be formed from cost-effective and geometrically flexible sheet metal. - By offsetting the pivot points, a lower spring rate can be achieved. This is advantageous because many coils (which are costly and space-consuming) are not required.

[0056] Other advantages include: Adjustability (of the centering) The spring constant is adjustable on each side of the pad, allowing for better adaptability – within limits – for different inner / outer surfaces and depending on the surroundings. Installation via the central centering bracket compensates for uneven force distribution. Possibly enables "active" saddle centering. Active pad spring suspension by means of a "fork" at the end of the spider (not part of the invention).

[0057] Further advantageous embodiments of the invention are characterized in the dependent claims.

[0058] Exemplary embodiments of the invention are described below with reference to the accompanying drawings.

[0059] They show: Fig. 1 and Fig. 2 each a partial section of a disc brake not according to the invention in a perspective top view; Fig. 1a an enlarged schematic partial sectional view of the disc brake according to Fig. 1; Fig. 3-7 further embodiments not belonging to the invention, illustrated by a detail of the disc brake, each also in a graphical representation; Fig. 8-26 further embodiments not belonging to the invention, each shown as a detail of the disc brake in a perspective view; Fig. 27 a perspective view of an embodiment of a disc brake according to the invention; Fig. 28 another embodiment not belonging to the invention; and Fig. 29 a perspective view of another embodiment of the disc brake not belonging to the invention.

[0060] In the Fig. Figure 1 shows part of a disc brake 100 for a commercial vehicle, with a brake caliper 1 overlapping a brake disc 2. The brake disc 2 has a brake disc pivot axis 2a (see Figure 1). Fig. 29). The brake caliper 1 is axially displaceable relative to the brake disc 2 in the direction of the brake disc rotation axis 2a and is connected to a brake carrier 6, for which purpose the brake caliper 1 is mounted on guide rails (not shown) which are connected to the brake carrier 6 which is fixed to the vehicle.

[0061] The brake caliper 1 comprises a clamping section 1a, a caliper back 1b, and two tie rods 1c. The clamping section 1a accommodates a clamping device (not shown) for the disc brake 100. The clamping section 1a extends with one side parallel to the plane of the brake disc 2 on one side of the brake disc 2. On the other side of the brake disc 2, also extending parallel to the brake disc 2, the caliper back 1b is arranged. The caliper back 1b is connected to the clamping section 1a at each end by a tie rod 1c. The tie rods 1c extend substantially perpendicular to the clamping section 1a and the caliper back 1b. In this arrangement, the clamping section 1a, the caliper back 1b, and the tie rods 1c define a central opening 41 between them, which spans the brake disc 2.The opening 41 has an imaginary longitudinal centerline, which lies in the plane of the brake disc 2 and connects the imaginary centers of the tie rods 1c. Furthermore, the opening 41 has another imaginary transverse centerline, which connects an imaginary center of the clamping section 1a to an imaginary center of the caliper back 1b. The longitudinal centerline and the transverse centerline intersect at an imaginary center point, which is referred to here as the virtual center of the opening 41.

[0062] Brake pads 3 are arranged in the brake carrier 6, which can be pressed against the brake disc 2 on both sides in the event of braking. Each brake pad 3 has a pad carrier plate 4 and a friction lining 5 attached to it on the side facing the brake disc 2, which is pressed against the brake disc 2 when in operation, i.e., during braking.

[0063] The brake pads 3 are accessible for replacement and maintenance through the central opening 41. They can be inserted into and removed from their respective pad slots through this central opening 41.

[0064] The lining shafts are each laterally fixed by brake carrier horns 25 (see Fig. 8).

[0065] Braking is effected by means of the clamping device located in a receiving chamber in the clamping section 1a of the brake caliper 1, with a brake lever positioned in a dome 23 of the brake caliper 1. The associated brake pad 3, referred to as the action-side or clamping-side brake pad, initially contacts the brake disc 2 during braking. Subsequently, the brake caliper 1 is moved in the opposite direction by means of the reaction forces that occur, taking the reaction-side brake pad 3 with it, until it also comes into contact with the brake disc 2, rubbing against it.

[0066] After the brake is released, the two opposing brake pads 3 are detached from the brake disc 2 by means of a reset device so that the disc runs freely relative to the brake pads 3.

[0067] The return device consists of at least one spreading device 8 which, according to the invention, acts on the opposing brake pads 4 in the same manner against the clamping direction.

[0068] In the Fig. In the example shown not according to the invention, the spreading device 8 consists of two mirror-image shaped, but otherwise identical, band springs 9, which are held on a lining retaining spring 7 of the respective lining carrier plate 4, for which purpose a tab 11 is formed on each band spring 9, which engages positively in a slot 10 of the lining retaining spring 7.

[0069] This is in Fig. 1a an enlarged schematic partial sectional view of the non-inventive disc brake 100 according to Fig. 1 shown. The section runs through a point in relation to Fig. 1 vertical plane passing through the brake disc rotation axis 2a.

[0070] The portion of the spring 9 that contacts the backing plate 4 is located in a central section of the spring 9 and is referred to here as the pressure section 11a. The pressure section 11a extends upwards through the tab 11. In this example, the pressure section 11a rests against a clamping element 7a, which is attached to the backing plate 4 in its central upper region to hold the spring 7 in place. A section of the clamping element 7a extends through the slot 10 of the retaining spring 7. This slot 10 is therefore already present and can be used for the positive engagement of the tab 11 of the spring 9.

[0071] The section of the clamping element 7a whose outer surface is in contact with the pressure section 11a of the band spring 9 rests with its inner surface against the lining plate 4. In this way, the compressive force of the pressure section 11a of the band spring 9 is transferred to the lining plate 4. These explanations naturally also apply to the other band spring 9.

[0072] Furthermore, in Fig. 1a a pad retaining bracket 28 (see also Fig. 8) shown, which is arranged above the brake pads 3 in the transverse direction of the opening 41 or in the direction of the brake disc rotation axis 1a between the clamping section 1a and the caliper back 1b and is attached to them. The pad retaining bracket 28 presses with sections of its underside against the clamping elements 7a and thus against the pad retaining springs 7, thereby holding the brake pads 3 in their pad slots.

[0073] At its end, each band spring 9 is axially secured to a bracket 12, which is attached to the brake carrier 6, with both band springs 9 arranged at a distance from each other. For axial securing, retaining clips 13 are provided on the bracket 12, clamping the respective ends of the band spring 9 between them.

[0074] When the brake pads 3 are tightened, the band springs 9 are deformed accordingly under spring tension, so that after the brake is released the brake pads 3 are pushed out of their braking position evenly by the available spring force.

[0075] In the Fig. Figure 2 shows a further embodiment not according to the invention, in which the spreading device 8 is formed from a spring clip 14, preferably made of spring wire. Such a spring clip 14 is pivotably held at each end region of the pad carrier plate 4 on the side facing the pad retaining springs 7, for which purpose a suspension 15 is arranged on the pad carrier plate 4, in which the ends of the spring clip 14 are offset from each other and rotatably held, viewed radially to the brake disc 2.

[0076] In the Fig. 2 The suspension 15 comprises a rectangular bearing section 151, 152 for each end of the spring bracket 14, which are connected by a connection 150 such that the bearing section 151 protrudes upwards from the connection 150 and the bearing section 152 protrudes downwards.

[0077] The suspension 15 can, for example, be formed integrally with the support plate 4, for instance by mechanical machining. It is also possible that the suspension 15 is attached to the support plate 4.

[0078] The suspension point 15 can also be, for example, a rectangular plate, as shown further below ( Fig. 24) is described in detail below.

[0079] A spring clip 14 rests against each associated brake carrier horn of the brake carrier 6, specifically on the side opposite the brake disc 2, so that when the brake pads 3 are applied, the spring clips 14 deform under tension. When the brake is released, the brake pads 3 are pushed back by the spring force of the spring clips 14 in the opposite direction of their application, similar to the embodiment shown. Fig. 1.

[0080] In the Fig. Figure 3 shows another embodiment of the spreading device 8 that is not according to the invention, where the illustration of the brake caliper has been omitted.

[0081] This spreading device 8 consists of two leaf springs 17 attached to opposite sides of the brake carrier 6 by brackets 12, each of which carries two scissor links 16 at its mutually facing free ends, one of which is pivotably attached to the action-side brake pad 3 and the other to the reaction-side brake pad 3.

[0082] In this embodiment, the spring force required for spreading is achieved by the leaf springs 17, which curve radially outwards when the brake linings 3 are applied and extend according to the spring action when the brake is released, while simultaneously extending the connected scissor links 16 and spreading the brake linings 3 apart.

[0083] In the Fig. Figure 4 shows a further variant of the spreading device 8 not according to the invention, which has two crossed spring arms 18 that are pivotally attached to a retaining bracket 21. This is, similar to the attachment of the leaf springs 17 to the brake carrier 6, also held by brackets 12 connected to it, which spans the brake disc 2, with respect to its thickness, in a partial circumferential area at its center.

[0084] The curved ends of the crossed spring arms 18 each rest against a surface 19 of the pad carrier plate 4, so that this scissor-like construction spreads apart when the brake is applied, i.e., when the brake pads 3 are moved axially towards each other. The spring arms 18 are attached to the retaining bracket 21, so that the spring arms 18 are pre-tensioned when the brake pads 3 are applied and the brake pads 3 are spread apart by this pre-tension after the brake is released.

[0085] The Fig. Figure 5 shows a spreading device 8 not according to the invention, which consists of two identical spring arms 20 which are connected to each other in the central area in the longitudinal direction of the opening 41, as well as with a retaining arc 21 which is attached to the brake carrier 6 via brackets 12.

[0086] Here, the spring arms 20 rest against two opposing end regions of the pad carrier plate 4, specifically in a protruding upper edge region. The ends of the spring arms 20 are also bent, allowing them to slide smoothly along the pad carrier plate surface when the brake is applied and released. The preload created during application also enables the brake pads 3 to spread apart after the brake is released.

[0087] In the Fig. 6 Each spreading device 8 not according to the invention consists of a support leg 22 rotatably connected to the bracket 12, which is formed in a loop shape from a spring wire and which, like the spring arms 20, is also arranged according to the Fig. 5, at the edge area of ​​the respective assigned support plate 4, wherein the two resilient contact legs 22 of each side rest on the mutually facing sides of the support plates 4.

[0088] In the Fig. 7 Finally, another variant not according to the invention is shown, which is essentially comparable to the embodiment according to Fig. 1. Here too, the band spring 9, which is assigned to each brake pad 3, engages centrally on the pad carrier plate 4, preferably on a contact 19, wherein the band spring 9 is provided with a flared contact bracket 24 for this purpose.

[0089] For the central adjustment of both band springs 9, with respect to the brake disc 2, the band springs 9 are axially displaceable and attached to the two opposing brackets 12.

[0090] In the Fig. In the example shown in Figure 8, which does not belong to the invention, the retaining bracket 21 is C-shaped, with a central leg 26 arranged in the middle of the thickness of the brake disc 2 and extending in the circumferential direction, to which an angled end leg 27 is attached on both sides.

[0091] In the Fig. 9, which shows a partial section of a completed non-inventive disc brake 100, while the Fig. Figure 8 merely shows the brake carrier 6 with the brake pads 3 installed, just as in the Fig. 10 clearly shows (not belonging to the invention) that the end legs 27 are provided on the facing sides with tabs 29 on which pins 30 are held, which are inserted into bores 25a (see Fig. 26) engage the brake carrier horns 25.

[0092] The retaining bracket 21 forms a centering device for the brake caliper 1 insofar as the brake carrier 6, to which the retaining bracket 21 is attached, forms a stationary part relative to which the brake caliper 1 is slidably mounted, so that after releasing the brake and spreading the spreading device 8, i.e., pushing the brake pads 3 apart, the brake caliper 1 is guided into a centered position.

[0093] The Fig. Figure 10 shows the brake pads 3 with the spreading device 8 and the retaining arc 21 in isolation.

[0094] In the Fig. 8 and Fig. Figure 9 shows that a pad retaining bracket 28 held on the brake caliper 1 is supported on the pad retaining springs 7 of the brake pads 3 and holds down and tensions the retaining arch 21.

[0095] Again Fig. As can be seen from Figure 10, the spring arms 20 of the spreading device 8 are firmly connected to each other in the central area, according to the Fig. 5.

[0096] Furthermore, in the Fig. 9 and Fig. Figure 10 shows that the spring arms 20 each have support legs 31 at their free ends, which are supported against the edges of the pad support plates 4 associated with the pad retaining springs 7 and by means of which the spring arms 20 are prevented from dislodging from their contact with the respective pad support plate 4 during vibrations during driving. The support legs 31 are clamped between the pad retaining springs 7 and the associated pad support plate 4, the pad support plate 4 having a cutout (not shown) through which the respective support leg 31 is guided. This prevents the spring arms 20 from tilting.

[0097] In an enlarged view, this is shown in the Fig. Figure 11 (not part of the invention) shows a pressure leg 32 of a spring end 300, curved and molded onto the spring arm 20. This pressure leg rests against the edge surface of the pad carrier plate 4 facing the friction lining 5 and, as mentioned above, forms a tilt protection device. Furthermore, it prevents the friction lining 5 from striking the spring arm 20. The support leg 31, which rests on a narrow side of the pad carrier plate 4 facing away from the brake carrier 6, and the pressure leg 32 form the prongs of a fork with a slot 301, as is the spring end 300 of the spring arm 20. As already mentioned, the spring end 300 of the spring arm 20 in the contact area with the pad support plate 4, i.e. the pressure leg 32, is convexly curved in the direction of the pad support plate 4 in order to ensure unimpeded sliding on the pad support plate 4.

[0098] The support leg 31 of the spring end 300 rests with a bearing section 31a of its underside facing the slot 301 on a bearing surface 305 of the upper side of the lining carrier plate 4. The pressure leg 32, with a contact section 32a which points towards the lining carrier plate 4, is in contact with a contact surface 303 of the lining carrier plate 4. The contact surface 303 is located on the side of the lining carrier plate 4 on which the friction lining 5 is applied. The contact surface 303 is arranged above the friction lining 5 in an end region of the lining carrier plate 4.

[0099] The bearing surface 305 on the top of the support plate 4 can be arranged at an angle 306 to an imaginary horizontal with an angle in a range of, for example, 5 to 15°.

[0100] The contact surface 305 forms a guide for the support leg 31 of the spring end 300 of the spring arm 20 during its movements in directions of movement 302 (e.g. due to wear compensation) and a stop for this in one direction towards the top of the lining carrier plate 4.

[0101] Furthermore, the contact between the bearing surface 305 of the pad carrier plate 4 and the support leg 31 of the spring end 300 of the spring arm 20 provides radial cushioning for the brake pad 3. Additionally, the pad carrier plate 4, and thus the brake pad 3, is pressed downwards into its pad recess and cushioned by this contact with the support legs 31 of the spring ends 300. If the spreading device 8, as e.g. in Fig. 1a shown, which is fixed by the pad retaining bracket 28, the brake pads 3 could under certain circumstances also be designed without pad retaining springs 7.

[0102] The contact surface 303 forms a guide for the pressure leg 32 of the spring end 300 of the spring arm 20 during its movements in directions of movement 302 (e.g. in wear compensation) and a stop for this in one direction towards the pad carrier plate 4 parallel to a brake disc rotation axis 2a.

[0103] In an embodiment not shown, which is not according to the invention, the contact surface 303 can protrude from the support plate 4 or be formed into the support plate 4, for example as a groove.

[0104] The contact surface 303 and the bearing surface 305 can be provided as guide surfaces with a special surface treatment, e.g. ground, to have a low frictional resistance.

[0105] It is also possible that a projection 304 is provided, which extends from the lining carrier plate 4 towards the spring end 300 in the slot 301. In this way, the projection forms an additional guide for the spring end 300.

[0106] In the Fig. Figure 12 (not according to the invention) shows an enlarged section of the retaining arc 21 in the connection area to the brake carrier horn 25, wherein the tab 29 rests on a flat end face of the brake carrier horn 25. The pin 30 can be designed as a rivet and inserted into a bore 25a (see Figure 12). Fig. 26) of the brake carrier horn 25. It is also possible that the pin 30 is molded onto the brake carrier horn 25 or is already permanently installed as a separate component.

[0107] In the Fig. 13 is the non-inventive spreading device 8 according to the Fig. 8-13 as a detail. At the free ends of the spring arms 20, respective spring ends 300 are designed as curved pressure legs 32. The pressure legs 32 each have the in Fig. 11. The above-mentioned section 32a of the system is also shown. In addition, the pressure legs 32 are provided on their undersides with a respective support section 32b, which, for contact as explained below, has a suitable surface finish with a low coefficient of friction.

[0108] In Fig. Figure 13a (not pertaining to the invention) shows an enlarged partial view of the end region of a lining carrier plate 4 of a brake pad 3 together with such a pressure leg 32. The brake pad 3 is inserted in its lining channel between two brake carrier horns 25, of which only one is shown here. As described above in connection with Fig. 12 described an end leg 27 of the retaining arch 21 attached.

[0109] The end region of the support plate 4 is provided with a support section 44, which is formed into the support plate 4, e.g. by mechanical processing. The support section 44 has a contact surface 45 and a bearing surface 46.

[0110] The contact surface 45 runs parallel to the side surface of the pad carrier plate 4, which is provided with the friction lining 5, wherein the contact surface 45 is spaced from this side surface in the direction of the brake disc rotation axis 2a, i.e. axially, by an axial depth of the support surface 46.

[0111] The pressure leg 32 is arranged in the support section 44 and its contact section 32a is in contact with the contact surface 45. Simultaneously, the pressure leg 32 rests on the contact surface 46 with its bearing section 32b. In this way, the pressure leg 32 is guided through the support section 44 during its movement by its contact with it. The contact surface 45 and the contact surface 46 can be machined to have special friction properties to facilitate this movement.

[0112] Furthermore, the pad carrier plate 4, and thus the brake pad 3, is pressed downwards into its pad recess and cushioned by these contacts with the pressure arms 32 of the spring ends 300. If the spreading device 8, as e.g. in Fig. 1a shown, fixed by the pad retaining bracket 28, the brake pads 3 could under certain circumstances also be designed without pad retaining springs 7. while the Fig. Figure 14 (not part of the invention) shows an enlarged view of a partial section of the connection area of ​​the retaining bracket 21 on the brake carrier horn 25. A retaining plate 40 is provided as a tilt protection device, which is attached to the central leg 26 and against which the brake pad retaining bracket 28 rests.

[0113] Unlike the one in the Fig. In the embodiment shown in Figure 13, the tab 29 is not angled relative to the end leg 27, but is formed by it in the same direction, by appropriate shaping of the retaining arc 21.

[0114] A comparable embodiment not belonging to the invention is described in the Fig. 15 shown, in which, however, the securing of the end leg 27 or the tab 29 is effected by means of a nut 33 which is screwed onto a threaded stud of the brake carrier horn 25 and holds the tab 29 on the brake carrier horn 25.

[0115] In the Fig. 16 (not according to the invention) a support tab 34 is angled opposite to the end leg 27 of the retaining arch 21, which rests on the front face of the associated brake carrier horn 25 and which, comparable to the support leg 31 according to Fig. 11, forms a radial locking device for the retaining arc 21 and thus for the spreading device 8.

[0116] Another variant of the attachment of the retaining bracket 21 to the brake carrier horn 25, which is not in accordance with the invention, is described in the Fig. 17, which shows an enlarged section of the corresponding area of ​​the brake carrier 6.

[0117] Here, the end leg 27 is angled at its end approximately parallel to the middle leg 26 and placed on the pin 30 which is attached to the brake carrier horn 25.

[0118] In the Fig. Figure 18 shows a non-inventive embodiment of the spreading device 8, in which the spring arms 20, of which the end section of a spring arm 20 is shown, perform on the one hand the function of the retaining arc 21 and on the other hand the function of spreading.

[0119] For this purpose, the spring arm 20 is split longitudinally in its end region, forming a spring bar 38 and a connecting bar 37. The spring bar 38, which is provided with an angled tab 39 molded onto its end, performs the spreading function; that is, it is tensioned against the spring force when the brake pad 3 is displaced due to braking and, after the brake is released, presses the brake pad 3 into its end position, with the angled tab bearing against the pad carrier plate 4 both in the tension direction and in the radial direction, i.e., at the upper edge of the pad carrier plate 4.

[0120] The connecting web 37, on the other hand, is provided at its end with a tab 29 having a pin 30, the pin 30 being inserted into a bore 25a (see Fig. 26) of the brake carrier horn 25 is inserted to enable, as described, centering of the brake caliper 1 after a braking operation.

[0121] The Fig. Figure 19 shows the central region of a further embodiment of the spreading device 8 not according to the invention, in which the spring arms 20 are formed from two intersecting individual springs which are rigidly connected to each other in the central region. One spring arm 20 of one individual spring rests against a pad support plate 4 and the other spring arm of this individual spring rests against the other, opposite pad support plate 4, as do the spring arms 20 of the other individual spring.

[0122] One of the Fig. 5. Comparable fastening of the bracket 12 is in the Fig. 20 (not according to the invention). However, the retaining device 13 for holding the retaining bracket 21 is omitted here. Instead, the retaining bracket 21 is axially secured to the bracket 12, in particular by friction, but also conceivably by positive locking. Furthermore, the bracket 12 is inserted into bores 25a in the opposing brake carrier horns 25.

[0123] A different, non-inventive construction is described in the Fig. 21, which shows an enlarged section of a fastening of the retaining arch 21.

[0124] The bracket 12 is designed as an extended rod and is attached at its end to the retaining arch 21, the end leg 27 of which is aligned with the middle leg 26, the end leg 27 having a fork-shaped end which engages a pin 35 which is embedded in the brake carrier horn 25.

[0125] In the Fig. 22 (not according to the invention), also an enlarged partial section in the area of ​​a brake carrier horn 25, it can be seen that a support tab 34 is attached to a spring arm 20 of the spreading device 8, which rests on a support surface 36 of the brake carrier horn 25 and is supported on the one hand in a radial direction to the brake disc 2 and on the other hand in an axial direction to it.

[0126] Comparable to the design according to Fig. 2 is in the figures Fig. 23 and Fig. 24 each shows a non-inventive embodiment of the spreading device 8, which consists of a spring bracket 14 and a support leg 22, both of which are inserted at their ends with a fastening end 14a, 22a into the suspension 15, wherein the latter is attached to the support plate 4.

[0127] The spring clip 14 and the mounting leg 22 are offset from each other and attached to the suspension 15 on opposite sides, and are supported on the brake carrier 6 at the point shown in the Fig. 23 example shown below the support plate 4 and in the Fig. 24 example shown at brake carrier horn 25.

[0128] The suspension 15 is designed as an elongated, rectangular plate with two longitudinal sides 15a, 15b. Two diagonally opposite ends are rounded. The fastening end 14a of the spring clip 14 is located on the Fig. 24 shown, the upper, narrow longitudinal side 15a is connected off-center to the suspension 15 on the right, whereas the fastening end 22a of the mounting leg 22 is connected off-center to the suspension 15 on the lower, other narrow longitudinal side 15b on the left.

[0129] The other ends of the spring clip 14 and the mounting leg 22 run diagonally towards each other and are firmly connected by a connecting arc 220.

[0130] The mounting plate 15 is provided here with two mounting holes 15c for fastening, e.g. by means of screws or rivets.

[0131] Fig. 25 shows another embodiment not according to the invention, which is similar to the one in the Fig. 8, Fig. 9, Fig. 10 to Fig. It is structured as described in section 11, but with some differences.

[0132] The retaining bracket 21 and the spring arms 20 are formed here in one piece, e.g. as a stamped and bent part, and are rigidly connected in a central area by a common base section 42. The base section 42 lies in the virtual center of the opening 41 and in a plane that runs tangentially to the brake disc 2.

[0133] From this base section 42, the middle legs 26 of the retaining arc 21 extend downwards on both sides over the brake disc 2 as in the embodiment shown in the following illustration. Fig. 4 shown as flat strip sections extending to just before the tension struts 1c, which laterally define the opening 41. At these points, both middle legs 26 are bent towards the clamping section 1a of the brake caliper 1 and each transition into an end leg 27.

[0134] Each end leg 27 has the tab 29 with the pin 30, similar to the embodiment shown in [reference]. Fig. 8, however, with the difference that the tab 29 is not widened. Each end leg 27 runs with its tab 29 in such a plane that the tab 29 rests on the associated brake carrier horn 25. The pin 30 is inserted into a bore 25a (similar to in Fig. (shown in 26) and attached to the brake carrier horn 25. This applies, of course, to both sides and to both brake carrier horns 25.

[0135] Furthermore, the base section 42 has a connecting section 43 on each of its two longitudinal sides, bent downwards by approximately 90° towards the brake disc 2. Each connecting section 43 connects two spring arms 20 to the base section 42 on each longitudinal side, parallel to the imaginary longitudinal center line of the opening 41, such that an arrangement similar to that shown in Fig. 8 results. Each connecting section 43 lies in a respective plane that is arranged at approximately 90° to the plane of the base section 42 and runs essentially parallel to the plane of the brake disc 2.

[0136] The spring ends 300 of the spring arms 20 are as in the embodiment shown in the following Fig. 8 and in the Fig. 11 are depicted and described.

[0137] In Fig. Figure 26 shows a further embodiment which does not belong to the invention, in which the retaining arc 21 according to the invention is wire-shaped and has, for example, a circular cross-section.

[0138] The retaining bracket 21 according to the invention comprises a central section 26a in a central region of the opening 41. A central section 26 adjoins the central section 26a on each side, each of which curves towards the clamping section 1a through an end leg 27 onto the respective brake carrier horn 25. Each end leg 27 is then bent downwards by approximately 90° into a fastening section 27a. Each fastening section 27a is fastened in a bore 25a of each brake carrier horn 25 of the lining channel of the action-side brake lining 3 and thus forms the support of the retaining bracket 21 with the spreading device 8 in the brake carrier 6.

[0139] The spring arms 20 are not connected longitudinally to the opening 41, but transversely to the opening 41, in pairs by a connecting section 200. Each connecting section 200 widens radially downwards towards the brake disc's axis of rotation 2a and has a recess 201. Each recess 201 communicates with the outer contour of the retaining bracket 21 and has a semicircular cross-section that is open upwards to receive the retaining bracket 21. The connecting sections 200 of the spring arms 20, arranged in pairs, are positioned at a distance 203 from the central section 26a of the retaining bracket 21, with the center of the central section 26a corresponding to the virtual center of the opening 41 and forming the center of the distance 203. One dimension of the distance 203 corresponds approximately to one-quarter of the longitudinal extent of the opening 41.The dimension of the distance 203 can, for example, be in a range of 30 to 50% of the length of the opening 41, either symmetrically to the virtual center of the opening 41 or without reference to the virtual center of the opening 41.

[0140] The spring arms 20 and their connecting sections 200 are, for example, designed as one-piece stamped and bent parts made of strip spring steel.

[0141] In the embodiment of the invention, Fig. 27 is the retaining arc 21 according to the invention as in the embodiment according to Fig. 26. Here, however, the spring arms 20, arranged in pairs transversely to the opening 41, including their connecting sections 200, are wire-shaped. The connecting sections 200 are bent to form receptacles for the retaining arc 21. The connecting sections 200 are as in the embodiment according to Fig. 26 arranged at a distance of 203 on the central section 26a of the retaining arch 21.

[0142] The ends of the spring arms 20 are each designed as a downwardly bent mounting section 20a. Each mounting section 20a is received from above in a receiving hole 4a at each end region of a pad support plate 4. The spreading device 8 transmits its spreading forces in this way between each mounting section 20a in the associated receiving hole 4a to the respective pad support plates 4.

[0143] Fig. Figure 28 shows a non-inventive embodiment in which the retaining arc 21 is as in the embodiments according to Fig. 26 and Fig. 27 is C-shaped. The spring arms 20 have spring ends 300 according to Fig. 11. In addition, the spring arms 20 are arranged in pairs in the transverse direction of the opening 41. Each pair of spring arms 20 is connected at its other ends by a respective hood connector 202.

[0144] Each hood connector 202 has a receiving opening pointing downwards towards the brake disc 2 in the longitudinal direction of the central section 26a of the retaining arc 21, which communicates with the outer contour of the central section 26a of the retaining arc 21.

[0145] The spring arms 20, each connected in pairs to a hood connector 202, are mounted from above onto the central section 26a of the retaining arch 21 such that the central section 26a is received in the receiving openings of the hood connectors 202. The hood connectors 202 are arranged at a distance 203 from each other.

[0146] The central section 26a of the retaining arch 21 is also provided at its ends, in the respective transition to the respective central leg 26, with a widening 26b. Each widening 26b forms an axial stop for the associated hood connector 202 on the central section 26a in the direction of the respective adjacent tension strut 1c.

[0147] Fig. Figure 29 shows a non-inventive disc brake 100 in a perspective view with the brake disc 2 and the brake disc rotation axis 2a.

[0148] A rotation arrow around the brake disc axis of rotation 2a indicates a main direction of rotation for forward travel of a vehicle to which the disc brake 100 is assigned. With respect to the main direction of rotation of the brake disc 2, a lead-in side ES and, opposite it, a trailing side AS are defined on the disc brake 100. Accordingly, the brake carrier horns 25 on the lead-in side ES are called lead-side brake carrier horns 25 and those on the trailing side AS are called trailing-side brake carrier horns 25.

[0149] In this embodiment, the spreading device 8 is essentially the same as the spreading device 8 of the non-inventive embodiment according to Fig. 28 constructed. One difference from the embodiment according to Fig. However, point 28 consists in the fact that in Fig. 29 The hood connectors 202 on both sides of the retaining arch 21 are each connected by a longitudinal connector 202a. In addition, the retaining arch 21 has no extensions 26b here.

[0150] In preferred embodiments, the combined length of the spring arms 20 in the longitudinal direction of the opening 41 corresponds to approximately 60 to 95% of the brake lining length, and particularly preferably to 70 to 80% of the brake lining length. The brake lining length is understood to be the distance between the associated brake carrier horns 25.

[0151] The spreading device 8 comprises two spreading elements, wherein, in a non-inventive embodiment, a first spreading element has two spring arms 20 connected longitudinally along the opening 41 and acting on the first brake pad 3. A second spreading element has two further spring arms 20, also connected longitudinally along the opening 41, acting on the second brake pad 3. The two spreading elements are connected to each other centrally (with respect to the brake carrier horns 25). Thus, an identical spring force – within a small tolerance range – can be ensured on both the entry and exit sides. Different spring forces between the exit side AS and the entry side ES, which can lead to uneven wear, are minimized by the single-sided engagement of one spring arm 20 per brake pad.

[0152] Uniform force application by the spring arms 20 on the action and reaction sides, i.e., on the side of the clamping section 1a (pressure piece side) and the side of the caliper back 1b (caliper side), can be achieved by a flexible adjustment of the central web, i.e., the retaining arch 21. Furthermore, the flexible central web can compensate for minor geometric misalignments of the brake disc 2, friction lining 5, and pad carrier plate 4.

[0153] The central web allows the spreading device 8 to be easily positioned as an active return-to-hold (ACR) device and held in place by the pad retaining bracket 28. Advantageously, the spreading device 8 can be easily removed and replaced when changing the pad.

[0154] By utilizing the entire pad liner length between the brake carrier horns 25, spreading elements or spring arms 20 with a very low spring rate can be used to apply essentially constant forces as the pad wears. The long spring travel allows the spring arms 20 to be tolerant of varying spring forces. This results in a constant spring rate with low tolerances.

[0155] In a preferred design variant, only two springs are used.

[0156] The spreading elements, i.e. the spring arms 20, can be formed from cost-effective and geometrically flexible sheet metal.

[0157] By offsetting the pivot points, a lower spring rate can be achieved (see Fig. 2, Fig. 23 and Fig. 24). Advantageously, only a small number of turns is needed.

[0158] The invention is not limited by the embodiments described above. It is modifiable within the scope of the attached claims. REFERENCE MARK LIST 1 brake caliper 1a Tensioning section 1b Saddle back 1c tension strut 2 brake discs 2a Brake disc pivot axis 3 brake pads 4. Support plate 4a Intake hole 5 friction lining 6 brake carriers 7 Pad retaining spring 7a Clamping element 8 Spreading device 9 Band spring 10 slots 11 tab 11a Printing section 12 hangers 13 fuse 14 spring clips 14a Attachment end 15 Suspension 15a, 15b Long side 15c Mounting hole 16 Scissors link 17 leaf spring 18 spring legs 19 Annex 20 spring arm 20a Fastening section 21 retaining arches 22 attachment legs 22a Mounting end 23 Cathedral 24 mounting brackets 25 Brake carrier horn 25a borehole 26 Middle thigh 26a Central section 26b Widening 27 End leg 27a Fastening section 28 pad retaining clips 29 tab 30 cones 31 Supporting legs 31a Edition section 32 pressure legs 32a Plant section 32b Edition section 33 Mother 34 Support bracket 35 pens 36 support surface 37 Connecting bridge 38 spring bars 39 Angle bracket 40 Retaining plate 41 Opening 42 Basic section 43 Connecting section 44 Support section 45 m² of installation area 46 contact surface 100 disc brake 150 connection 151, 152 warehouses 200 connecting section 201 Exclusion 202 hood connectors 202a Longitudinal connector 203 distance 220 connecting arches 300 spring end 301 slot 302 Direction of movement 303 Plant area 304 lead 305 mm contact area 306 angles

Claims

[1] Disc brake (100) for a commercial vehicle, comprising a brake caliper (1) designed as a sliding caliper that overlaps a brake disc (2), which is attached to a stationary brake carrier (6) and has a central opening (41) above the brake disc (2), two brake linings (3) arranged in the brake caliper (1) that are movable in opposite directions, each having a lining carrier plate (4) and a friction lining (5) attached thereto, one of which, on the action side, can be pressed against the brake disc (2) by means of a clamping device via at least one brake piston, and at least one return device with which the brake caliper (1) can be returned after a braking-induced displacement and release of the brake, wherein the return device has a spreading device (8) acting on the opposing brake linings (3) and acting in the same way opposite to the respective clamping direction, with spring-loaded spreading elements acting on the respective lining carrier plate (4),wherein the spreading device (8) is arranged in the central opening (41), and wherein the spreading device (8) comprises spring arms (20) as the resilient spreading elements, , characterized by , that the spring arms (20) are connected to a retaining arc (21) which is attached to the brake carrier (6), wherein the retaining arc (21) is connected to two brake carrier horns (25) which define a lining channel, wherein the ends of the spring arms (20) are each formed as a downwardly bent fastening section (20a), wherein each fastening section (20a) is received from above in a receiving hole (4a) at each end region of a lining carrier plate (4), whereby the spreading device (8) transmits its spreading forces between each fastening section (20a) in the associated receiving hole (4a) to the respective lining carrier plates (4). [2] Disc brake (100) according to claim 1, characterized by, that the central area of ​​the opening (41) extends on both sides of a virtual center of the opening (41) approximately parallel to the plane of the brake disc (2) over a length of 30 to 50% of a longitudinal axis of the opening (41). [3] Brake pad set for a disc brake (100) according to one of the preceding claims, comprising at least two brake pads (3) each with a pad carrier plate (4) and a friction lining (5) attached to the pad carrier plate (4) and with a spreading device (8), wherein the spreading device (8) has spring arms (20) as spreading elements, characterized by, that the spring arms (20) are connected to a retaining arc (21) which can be attached to the brake carrier (6), wherein the retaining arc (21) can be connected to two brake carrier horns (25) which define a lining channel, and wherein the ends of the spring arms (20) are each formed as a downwardly bent fastening section (20a), wherein each fastening section (20a) is received from above in a receiving hole (4a) at each end region of a lining carrier plate (4).

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