EP3953598A1

EP3953598A1 - Disk brake and brake pad

Info

Publication number: EP3953598A1
Application number: EP20717578.7A
Authority: EP
Inventors: Andreas Petschke; Matthias Adelung; Jens Fricke; Josef Schropp
Original assignee: Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Current assignee: Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Priority date: 2019-04-12
Filing date: 2020-03-27
Publication date: 2022-02-16
Also published as: WO2020207828A1; CA3136502A1; CA3136502C; MX2021012494A; CN113677908A; JP2022527403A; DE102019109817A1; KR20210149819A; US20220163077A1; BR112021018214A8; BR112021018214A2

Abstract

The invention relates to an electrically or pneumatically actuated disk brake for a utility vehicle, comprising the following features: - a disk brake (4) having a preferred direction of rotation (D), - a brake carrier (2), - a brake caliper which is movably guided on the brake carrier (2), - a brake-application-side brake pad (5) and a reaction-side brake pad (6), which are movably arranged in a brake-application-side pad shaft (203) and in a reaction-side pad shaft (204) of the brake carrier (2), parallel to a brake disk rotation axis (A4), - a brake application device which has an individual pressure piston (304) that has a center axis and has, on the end facing the brake-application-side brake pad, a pressure piece (306) which acts with a pressure surface (307) on a corresponding abutment surface (53) of the brake-application-side brake pad (5) such that an active surface is formed between the pressure surface (307) and the abutment surface (53) when applying the brake, - wherein the brake-application-side brake pad and the reaction-side brake pad are centered in the circumferential direction relative to the brake disk and the center axis of the piston (304), - wherein the active surface on which the pressure surface (304) and the abutment surface (53) adjoin each other when applying the disk brake is offset on the outlet side in the circumferential direction relative to the preferred direction of rotation of the brake disk (4) and the center axis of the piston (304).

Description

DISC BRAKE AND BRAKE PAD

The invention relates to a disc brake according to the preamble of claim 1 and a brake lining for such a disc brake.

EP 2 392 835 B1 is mentioned in relation to the prior art.

On disc brakes of heavy commercial vehicles with brake carriers and sliding calipers and a clamping device with only a single pressure piston, it is known according to this prior art to introduce constructive measures against oblique wear of the pads.

In this case, one or both brake pads are usually based on the brake disc in the circumferential direction on the inlet side or on the outlet side - based on the preferred direction of rotation of the brake disc - offset.

In terms of construction, this is usually relatively complex, since the lining shafts in the brake carrier are usually offset accordingly. It is also known to make a corresponding offset by means of chamfers or bevels on the friction materials, but this reduces the effective friction surface between the friction material and the brake disc.

The invention has the task of creating an alternative measure for Verrin reduction of the effect of oblique wear of the brake pads, which does not require an offset of a pad in the circumferential direction.

The invention achieves this object by the subject matter of claim 1 and by the subject matter of claim 17.

Is created - according to claim 1 - an electrically or pneumatically actuated - and thus also preferably electrically or pneumatically actuated during operation - disc brake for a commercial vehicle, with the following features: a brake disc with a preferred direction of rotation, a brake carrier, a brake caliper, the Brake carrier is displaceably guided, an application-side brake pad and a reaction-side Brake lining, an application device which has a single pressure piston which has a central axis and which has a pressure piece at an end facing the application-side brake lining, which acts with a pressure surface on a corresponding abutment surface of the application-side brake lining, so that between the pressure surface and the abutment surface is formed when the brake is applied, the application-side brake lining and the reaction-side brake lining are centered in the circumferential direction with respect to the brake disc and the center axis of the piston, the active surface on which the pressure surface and the abutment surface during application the disc brake lie on one another, in the circumferential direction based on the preferred direction of rotation of the brake disc and the central axis of the piston is offset on the outlet side.

A particular advantage of this embodiment is that even with a disc brake that has only a single pressure piston and in which the brake linings are both centered in the circumferential direction with respect to the brake disc, without an offset of a lining and / or its associated lining well times in that the pressure piece and / or the back plate of the brake pad is / are changed so that the effective surface is eccentric in the circumferential direction or is not centered in relation to the brake disc, oblique wear of the brake pads can be counteracted. This measure can easily be implemented in an after-equipping process or by a simple structural change in the elements of the pressure piece and / or the brake lining on the application side.

It is preferred that the pressure piston has a first, preferably cylindrical or partially cylindrical, section and the pressure piece for acting on the application-side brake pad at least when the disc brake is applied. It can also be provided that the brake disc has a diameter of 15 "or more, since with sliding caliper disc brakes of this type with a relatively large disc diameter it is particularly advantageous that oblique wear without a structurally complex offset of the lining wells and also without reducing the size of the effective Can be implemented by chamfers or the like. It can advantageously be provided that the application-side brake lining and the reaction-side brake lining are arranged in an application-side lining well and (ie or) in a reaction-side lining well of the brake carrier. It can also be advantageously provided that the brake caliper and the brake carrier each frame-like overlap the upper edge of the brake disc, a central opening being provided in the brake caliper for changing the lining. This means that the brake linings are inserted into the brake carrier through the central opening of the brake calliper and pulled out again in the opposite direction.

In the case of such brakes, it is in turn very advantageous that according to the invention there is no need to offset the brake pads in the circumferential direction, so that the length of the opening of the brake caliper in the circumferential direction can essentially correspond to the length of the brake pad.

For this purpose, it can further advantageously be provided that the lining wells of the Bremsträ gers are aligned centered in the circumferential direction with respect to the brake disc.

It can be provided that the brake linings each have a back plate and a friction material, with the friction materials and / or the back plate preferably being centered on the brake disc in the circumferential direction. These Ausgestaltun conditions are in turn very advantageous because they can ensure a particularly large friction surface and a particularly simple structure of the back plate. Particularly preferred, the back plate and the friction materials of both brake linings of a disc brake are aligned in the circumferential direction on the piston.

The invention can be developed in a structurally advantageous manner.

To implement the offset of the active surface on the outlet side, it can be provided that the pressure piece has a projection that has the pressure surface and that the pressure surface is arranged offset in the circumferential direction relative to the preferred direction of rotation of the brake disc on the outlet side. To implement the offset of the active surface on the outlet side, however, it can also be provided that the abutment surface of the back plate is offset in the circumferential direction on the outlet side with respect to the preferred direction of rotation of the brake disc.

To implement the offset of the active surface on the outlet side, provision can finally also be made for the abutment surface of the back plate offset on the outlet side to be formed by a shoulder of the back plate. This can be easily formed by an element attached to the back plate. It can furthermore be provided in a simple manner that the element attached to the back plate is a sheet metal element which is attached to the back plate.

The invention also provides a brake pad for a disc brake according to egg nem of the related claims, which has a - preferably a single - based on the center of gravity of the brake pad eccentric abutment surface for a pressure piston with a pressure surface. In this way, this brake lining is advantageously functionally improved and the offset of the active surface on the outlet side can be implemented in a particularly simple manner. For this purpose, it can be provided, for example, that the single eccentric abutment surface is essentially semicircular or completely semicircular.

The invention also provides a vehicle with at least one wheel axle, wherein the wheel axle - based on a or the main direction of travel of the vehicle - has a main direction of rotation and the wheel axle has at least one disc brake assigned to a left end (and a wheel) of the wheel axle on the left Vehicle side and wherein the wheel axle has at least one disc brake assigned to a right end (and a wheel) of the wheel axle on the right side of the vehicle, the disc brake on the left side of the vehicle and the disc brake on the right side of the vehicle according to one of claims 1 to 13 are formed from. The brake disks of the two disk brakes can be connected to the wheel axle in a rotationally fixed manner. In this way, disc brakes according to the invention are advantageously arranged and used as disc brakes on the left side of the vehicle and disc brakes on the right side (s) of the vehicle on a vehicle. The vehicle has multiple axles with left and right wheels. At least one or more of these Radach sen is or are hen verses in the end areas with disc brakes according to the invention.

According to an advantageous variant, the respective left and the respective disc brakes on the right side of the vehicle can differ only with regard to the brake linings and their back plates.

For example, a recess of the application-side brake lining located under the pressure surface in the case of a right disc brake with an application-side brake lining in the back plate can be completely or predominantly in the installed state more towards one - for example the right inlet side of the central axis, and with the corresponding left disc brake on one The application-side Bremsbe lay in the back plate wholly or predominantly in the installed state more to the other - for example left - side of the central axis. The clamping device is tightened from the center of the vehicle outwards (to the right or left) to the respective wheel. The main direction of travel is forward travel. The forward travel determines the main direction of rotation of the brake disc. It can be advantageous to mark whether a brake lining is provided for a disc brake on the left side of the vehicle or for a disc brake on the right side of the vehicle, for example by placing the application-side brake lining for the disc brake in the direction of travel on the left-hand side of the vehicle and the application-side brake lining for the disc brake on the right side of the vehicle with suitable markings such as "L" for "disc brake on the left side of the vehicle" and for example "R" for "disc brake on the right side of the vehicle" (in terms of the direction of travel of the vehicle).

For electrical or pneumatic actuation, the disc brake can be assigned an actuator or it can have this. The actuator can, for example, have an electric motor and preferably a transmission for electrical actuation that is directed to the The application device acts or, for example, a pneumatic cylinder for pneumatic actuation, which actuates the disc brake preferably with a piston rod. This turns it into an electrically or pneumatically operated disc brake.

The invention is described in more detail below on the basis of exemplary embodiments.

The invention is not shown conclusively by these, but can also be implemented in other ways not shown within the scope of the claims. Show it:

Fig. 1 is a view of part of its brake caliper, with a disc brake

Brake carrier, brake caliper and an application device in the direction of view of a pressure piece of the application device;

2 shows a perspective view of a pressure piston with a pressure piece;

3 shows a plan view of an arrangement with a brake carrier, brake linings and a pressure piston;

4 in a) and b) different views of a brake lining on the application side;

and

5 in a) and b) different views of an alternative embodiment of a brake lining on the application side;

Fig. 6 in a) is a perspective view of an application-side brake pad for a disc brake on the left side of the vehicle, with a circular area is shown where a preferably flat pressure surface of a pressure piece acts on the back plate, in b) an application-side brake pad for a disc brake on the left side of the vehicle and in c) a brake pad on the tension side for a disc brake on the right side of the vehicle, whereby the recess or depression of the brake pad on which the pressure piece acts is further to the left on the back plate for the left disc brake and on the right disc brake further right. The individual features of the disc brakes described below do not necessarily have to be combined with all of the other features of these exemplary embodiments. Rather, they can also be used individually or in combination with other embodiments of disc brakes according to the invention further features of these disc brakes. In addition, the illustrated exemplary embodiments can also be modified in detail.

1 and 3 show elements and assemblies of a disc brake 1 with a brake carrier 2, a brake caliper 3 and a brake disc 4. The brake caliper 3 is displaceably guided on the brake carrier 2. It is thus a sliding satellite disc brake. The disc brake is a brake for commercial vehicles. The vehicle can have several such disc brakes. The right and left disc brakes of the vehicle can each be designed according to the invention. The disc brake 1 is designed for actuation by a pneumatically driven actuator or by an actuator driven by an electric motor. The actuator can, for example, be a brake cylinder which acts on a brake lever with a piston rod (not shown here).

The brake disk 4 can preferably have a diameter of 330 mm or more (again preferably up to 432 mm). The application device is arranged in the brake caliper 3 on the application side 301 of the brake disc 4.

The brake caliper 3 overlaps the upper edge of the brake disk 4 like a frame. The brake disk 4 has a preferred direction of rotation D (FIG. 3). This corresponds to the direction of rotation of a vehicle wheel of a vehicle when driving forward.

The brake carrier 2 also has a frame-like shape and engages around egg NEN upper edge of the brake disc. 4 He is attached to a vehicle-side fastening means (not shown here). As a rule, this attachment takes place on an application side of the disc brake. The brake carrier 2 and the brake caliper 3 accordingly each have an application side 201, 301 and a reaction side 202, 302. The brake carrier 2 furthermore has a lining well 203 on the application side and a lining well 204 on the reaction side.

With regard to the preferred direction of rotation D of the brake disk 4 during forward travel, the brake carrier has an inlet-side cross strut 205 and an outlet-side cross strut 206. These are essentially perpendicular to a clamping side Longitudinal strut 207 and a reaction-side longitudinal strut 208. Each of the two lining shafts 203, 204 also has an inlet-side carrier horn 209, 210 and an outlet-side carrier horn 21 1, 212, with the respective brake lining 5, 6 in the circumferential direction at a Braking supported during forward travel. The term “circumferential direction” relates to the movement of the brake disc in direction D. Part of the brake disc 4 - a type of ring segment - protrudes upward through the brake carrier 2 or at least protrudes into it.

An “alignment in the circumferential direction” means that the corresponding element is centered in the circumferential direction with reference to this brake disk part. The element is then centered in front of the corresponding brake disk ring segment and is not shifted off-center with respect to this segment. For this purpose, the element can have a center plane that is radially aligned with respect to the brake disc axis of rotation A4 and it can also be provided that the center of gravity of the element - for example a brake lining 5 or 6 - parallel to the axis of rotation A4 of the brake disc 4 through this center plane runs.

The brake pads 5, 6 can be inserted into the pad wells 203, 204 - preferably through the opening 303 of the brake caliper - and are already inserted in FIG. The brake pads 5, 6 each have a back plate 51, 61 and a friction material 52, 62. The friction material 52, 62 is oriented towards the brake disc 4 in each case. The brake linings 5, 6 are displaceable parallel to the axis of rotation A of the brake disk. This axis of rotation A lies in FIG. 3 below the central axis M of a pressure piston 304 parallel to it. The United push the brake pads 5, 6 takes place during braking and possibly to compensate for pad wear. The brake pads 5, 6 and preferably their friction materials 52, 62 and preferably also their back plate 5, 6 can be aligned centered on the brake disc 4 in the circumferential direction. The Schwereli lines of these brake linings 5, 6 and preferably also those of their friction materials 51, 61 and their back plates 52, 62 then lie in the circumferential direction in the middle of these respective elements. The brake caliper 3 has a central opening 303 into which the peripheral edge of the brake disk 4 is immersed. This allows the brake pads 5, 6 to be inserted into the pad wells 203, 204 when the pads are changed. The brake caliper 3 has an application device on its application side (here, apart from a pressure piston 304, not shown or shown). This can be arranged in an opening of the brake caliper 3. The application device serves to convert a clamping movement of an element of the actuator into an application movement. For this purpose, the application movement can have one or more elements, for example a lever, a bearing and / or a cross-member, these elements acting on the pressure piston. The structure of such application devices is known per se in the most varied of ways and is therefore not explained in detail here.

The application device, otherwise not shown here, has the individual Druckkol ben 304 (see FIGS. 1, 2 and 3). This pressure piston 304 can have a cylindrical or part-cylindrical section 305. It also has, at its end facing the brake lining 5, a single pressure piece 306 for acting on the brake lining 5 on the clamping side, at least when the disc brake is applied.

A pressure surface 307 is formed on the free end of the pressure piece 306. The pressure piece 306 can be formed in one piece with the cylindrical section 305 or attached to it. The cylindrical section 305 can be designed as a pipe section, in particular as a threaded pipe section. The pressure piece 306 can also be designed as a pressure piece area which is otherwise indistinguishable from the section 305 and virtually only forms its free end area.

The back plate 51 of the application-side brake lining 5 has an abutment surface 53 corresponding to the pressure surface, on which the pressure surface 304 is supported during braking. The back plate 51 can otherwise be flat or else have ribs 54 and recesses / depressions 55 (FIGS. 4a, b, 5a, b). These can - possibly with a rib 54a, which forms the abutment surface 53 in Fig. 4, be distributed overall so that the gravity line M5 of the brake lining 53 and preferably also the gravity lines of its lining or friction material and the back plate through a Central axis M51 runs, which lies in a central plane and preferably plane of symmetry of the brake lining (based on the outer contour, except for deviations such as a recess for a sensor or the like). These gravity lines are then preferably aligned centered on the brake disc in the circumferential direction. When braking, the pressure piston 304 presses with the pressure piece 306 via the pressure surface 307 on the back plate 51 of the application-side brake lining 5. This displaces the application-side brake lining 5 in its application-side lining well

203 in the direction of the brake disk 202 until the application-side brake lining 5 comes into frictional contact with the surface of the brake disk 4 and brakes it. The Bremssat tel 3 is displaced against the direction of movement of the pressure piston 304 when braking as a result of the application process, whereby the reaction-side brake lining 6 is also pressed against the brake disc 4 with its friction material 62. The brake caliper 3 preferably acts over the entire surface of the back plate 62 of the re action-side brake pad 6, which is thereby also in its support shaft

204 is pushed axially parallel to the axis of the brake disc 4 in the direction of the brake disc 4 ver. In this way, the speed of rotation of the brake disc 4 is reduced during braking and the vehicle provided with the corresponding disc brake is braked.

In the context of this document, the effective surface is the surface on which the pressure surface 307 and the abutment surface 53 lie against one another when the brake is applied (see FIGS. 1, 2 and 3). If an additional element is arranged on the back plate, such as a sheet metal 56 - see FIG. 4 - via which the pressure piston 304 acts on the back plate 51, this element, in particular the sheet metal, is to be assigned to the back plate 51 and is used within the scope of this Font as an element of the brake lining 5, 6 understood.

It is provided that the active surface on which the pressure surface 304 and the counter bearing surface 53 lie against one another when the disc brake is applied, is not centered in the circumferential direction with respect to the brake disc, but is aligned offset in the direction of rotation on the outlet side. It can also be provided that the active surface is not centered in the circumferential direction on the central axis M304 of the pressure piston 304, but - wholly or for the most part - is offset relative to the central axis M304 with regard to the preferred direction of rotation of the disc brake 1 on the outlet side. This can be seen in FIG. 3 in that the line of force F or the force vector of the force with which the pressure piston 304 acts on the brake lining 5 is offset in the run-out direction relative to the central axis M304 and the brake disk axis of rotation A4.

The central axis M304 of the single pressure piston 304 can lie centrally between two central axes M213, M214 of slide bearings 213, 214 of the disc brake 1 with which the brake caliper 3 is guided relative to the brake carrier 2 in a preferred embodiment. These central axes M213, M214 are preferably at the same distance radially from the brake disk axis of rotation A4.

Moving the active surface between brake pad 5 and pressure piece 306 in the circumferential direction - based on the brake disc 4 - effectively and simply counteracts oblique wear.

It is particularly advantageous that the brake linings 5, 6 and in particular their friction surfaces and also the lining wells do not have to be offset relative to the central axis M304 of the pressure piston 306. They both remain centered in the circumferential direction in relation to the brake disk 4 and also in relation to the central axis M304 of the piston 304. The gravity lines (of the friction linings 52, 62 and / or the back plate 51, 61) preferably run through the plane that is spanned by M304 and A4.

A particular advantage of this embodiment is that even with a disc brake that has only a single pressure piston 304 and in which the brake linings 5, 6 are both centered in the circumferential direction on the central axis M304 and the brake disc 4, without an offset of a lining 5, 6 and / or its associated lining well 203, 204 simply by changing the pressure piece 306 and / or the back plate 51 of the brake lining 5 so that the effective surface is eccentric in the circumferential direction or not centered in relation to the brake disc is aligned, oblique wear can be counteracted. This measure can be implemented simply in a retrofitting process and / or by a simple design change in the elements of the pressure piece 306 and / or the brake lining 5 on the application side. The pressure surface 307 of the pressure piston 304 only presses on the back plate 51 of the application-side brake lining 5 in the area of the active surface during braking.

The pressure piston 304 has the central axis M304. The lining wells 203, 204 are each preferably constructed symmetrically with respect to this central axis M304 and with respect to a plane which is defined by the central axis M304 and the brake disc axis of rotation A4. This means that the support surfaces on the inlet-side and the outlet-side carrier horns 209, 210; 21 1, 212 are each equidistant from the central axis M304. The friction linings 52, 62 can also be designed accordingly symmetrically to this central axis. Your gravity lines can then lie on the plane defined by M304 and A4. This can mean in particular that the friction linings 5, 6 are centered with respect to the central axis M304 of the pressure piston 304 in the circumferential direction of the brake disc with respect to the pressure piston 304 and the brake disc 4 and not - with respect to the preferred direction of rotation of the brake disc 4 and the brake disc 4 - are offset on the inlet or outlet side.

During braking, the pressure piece 306 acts on the back plate 51 of the brake lining 5 on the application side in the force line in the active area that is cursed with it. The pressure piece 306 can be centered in the disc brake in the circumferential direction or direction of rotation.

The friction material 52 of the application-side brake lining 5 and the friction material 62 of the reaction-side brake lining 6 are each shifted by the same amount in the direction of the inlet side (at 205) only with regard to this force vector F. As a result, the effect of oblique wear of the brake linings 5, 6 can be counteracted in a simple manner.

In order to form the off-center active surfaces between the pressure piece 306 and the application-side brake lining 5, one or more structural measures are required. Thus, in order to form the active surface offset on the outlet side between the pressure piece 306 and the application-side brake lining 5, according to a variant, the pressure piece can have a projection 308 in the sense of a projection in the direction of the brake lining 5 that is offset to the outlet side and not symmetrical to the plane through M304 and A4 ( Fig. 1 and 2).

This approach 308 can be configured like a ring segment. For example, it can also be designed essentially semi-cylindrical. However, it could also have a different shape, for example in the area of the abutment surface 53. It acts in this way on the abutment surface 53. This abutment surface can be corresponding, e.g. also be designed like a ring segment. But it can also be designed differently, for example circular or rectangular.

However, according to another variant, for example, the pressure surface 307 of the pressure piece 304 cannot be offset in the circumferential direction on the outlet side, but rather be configured concentrically and / or symmetrically to the central axis and the abutment surface 53 of the brake lining 5 can be configured such that the active surface nevertheless is displaced on the outlet side, so that the effective force vector F1 is ver sets on the outlet side.

According to one variant, the pressure surface 307 of the pressure piece 306 can therefore be shifted off-center on the outlet side. However, the abutment surface 53 can also be displaced on the outlet side. Both surfaces can also be offset on the outlet side.

For this purpose, it is conceivable to provide an eccentric pressure contour on the back plate 51 of the application-side brake lining 5 as a projection 56 opposite the surrounding surface of the back plate 51, which is eccentric in relation to the central axis M of the pressure piston 304 and is raised in relation to at least one surrounding area so that the Pressure piece 304 with a suitable flat pressure surface 307 only acts on this pressure contour 54. This can also be achieved in that on the inlet side a corresponding recess 56a is provided in the back plate 51, which does not touch the pressure surface of the preferably otherwise flat pressure piece (FIG. 3). A one-piece projection of the back plate 51 can also be provided, or a separate element such as an attachment plate 55 can be attached as a projection on the back plate. The top plate 51 can be welded to the back plate or attached in some other way. But it can alternatively be a lumpy approach as a projection 56 in the manner of a raised area on the back plate 51 (Fig. 5a, 5b).

Alternatively, a sheet metal forming a projection (as a projection) could also be attached to the pressure piece (not shown).

It can be provided that the entire effective area lies to the side of the central axis M 304 in the outlet direction.

However, it can also be that the central axis M304 runs through the active surface and this has a greater extent towards the outlet side than towards the inlet side

By appropriately distributing the recesses 55 and / or ribs 56 on the back plate 51, the lines of gravity and the effective center of gravity of the entire lining 5 and also of the friction material 52 can continue to be aligned in the circumferential direction on the central axis M1 of the pressure piston 304.

The illustrated semicircular contour or ring segment-like contour of the active surface is advantageous. It is also advantageous if the entire effective area lies to the side of the central axis. This is preferred, but not mandatory.

The pressure piece 306 at the end of the pressure piston 304 can be configured essentially cylindrically, the pressure surface 307 then preferably being flat. It can be arranged in the middle.

The pressure piece 306 can, for example, also be oval and displaced in the direction of the outlet side or be placed eccentrically at the end of the section 305. It can also be the case, however, that the central axis runs through the active surface and that this has a greater extent towards the outlet side than towards the inlet side.

In the case of right and left disc brakes of a vehicle, the active surfaces on which the pressure surface 304 and the abutment surface 53 lie against one another when the disc brake is applied are offset in the circumferential direction relative to the preferred direction of rotation of the brake disc 4 and the central axis M of the piston 304 on the outlet side .

To meet this condition - according to one variant - the application-side brake linings of the right disc brake of the vehicle have a different back plate than the application-side brake linings of the left disc brake.

According to a variant, the disc brake 1 for the right end of the axle can be "the disc brake on the right side of the vehicle" - apart from its two brake pads, essentially structurally exactly like the disc brake 1 for the left end of the axle "the disc brake on the left side of the vehicle" be formed (in particular the lining wells of the brake carrier and the pressure pieces of the application devices). However, individual elements such as the sliding bearings - fixed and floating bearings - for the right and left disc brakes lead to a difference, because if e.g. Both fixed bearings are to be arranged on the disc brake “on the inlet side”, there are corresponding differences in this area for the left disc brake and the right disc brake.

The recesses 56a can be designed in such a way that they are aligned, in particular completely aligned, when their back plates are placed congruently on top of one another (FIGS. 6b, 6c).

The recess 56a of the application-side brake lining 5 can thus, for example, in a right disc brake with an application-side brake lining 5 in the back plate, completely or predominantly in the installed state, more to one - for example the right - side of the central axis and in the case of the corresponding left disc brake with one Application-side brake lining 5 in the back plate wholly or predominantly in the installed state more to the other - for example left - side of the Central axis towards (Fig. 6a, 6b, 6c). It can then be advantageous to mark whether a brake lining is provided or designed for a left or a right side of the vehicle or the disc brake installed there for the right or left side of the vehicle.

Fig. 6 shows this very clearly. 6a) shows a perspective view of an application-side brake pad 5L for a disc brake on the left-hand side of the vehicle, with a circular area showing where a preferably flat pressure surface 307 of the pressure piece acts on the back plate 51. Fig. 6 also shows in b) the application-side brake lining 5L for the disc brake on the left side of the vehicle without the indicated pressure surface 307. Fig. 6c then shows a too tension-side brake lining 5R for a disc brake on the right side of the vehicle, with the recess 56a or recess of the Brake lining, on which the pressure piston 305 acts via the pressure piece 306 (also see FIG. 5), lies further to the left on the back plate 51 in the case of the left disc brake and further to the right on the back plate in the case of the right disc brake (based on the center of the Back plate). Since the recess 56a is wholly or partially on the inlet side in the back plate under the pressure surface, the active surface is centered in the circumferential direction off-center or not centered with respect to the brake disc.

It should also be noted that the brake lining 5, 6 can have a hold-down spring 7, to which a leaf 7a belongs, with which the hold-down spring 7 can be attached to the brake lining proper.

Reference number

Disc brake 1

Brake carrier 2 application side 201

Reaction side 202 clamping-side lining duct 203 reaction-side lining duct 204 transverse strut 205, 206 longitudinal strut 207, 208 inlet-side carrier horn 209, 210 outlet-side carrier horn 21 1, 212

Slide bearing 213, 214 caliper 3

Application side 301

Response page 302

Opening 303

Plunger 304 cylindrical section 305

Pressure piece 306

Print area 307

Extension 308 brake disc 4

Brake pads 5, 6

Back plate 51, 61

Friction material 52, 62 abutment surface 53

Ribs 54

Recesses, depressions 55, projection 56

Recess 56a Gravity line M5

Center axis M51

Center axis M304

Axis of rotation A4 direction of rotation D

Claims

PATENT CLAIMS

1. Electrically or pneumatically operated disc brake for a commercial vehicle, with the following features:

a brake disc (4) with a preferred direction of rotation (D),

a brake carrier (2),

a brake caliper (3) which is displaceably guided on the brake carrier (2), an application-side brake lining (5) and a reaction-side brake lining (6), which are located in an application-side lining chamber (203) and in a reaction-side lining chamber (204) of the brake carrier ( 2) are arranged displaceably parallel to a brake disc rotation axis (A4),

an application device which has a single pressure piston (304) which has a central axis (M1) and which has a pressure piece (306) at an end facing the application-side brake lining, which with a pressure surface (307) on a corresponding abutment surface (53) of the acts on the tension-side brake lining (5) so that an active surface is formed between the pressure surface (307) and the abutment surface (53) when the brake is applied,

wherein the application-side brake lining and the reaction-side brake lining are centered in the circumferential direction with respect to the brake disc and the central axis (M) of the piston (304),

characterized in that

the effective surface on which the pressure surface (304) and the abutment surface (53) lie against each other when the disc brake is applied, is offset in the circumferential direction relative to the preferred direction of rotation of the brake disc (4) and the central axis (M) of the piston (304) on the outlet side .

2. Disc brake according to claim 1, characterized in that the to

The brake pad on the tension side and the brake pad on the reaction side are arranged displaceably parallel or essentially parallel to a brake disk axis of rotation (A4) in a pad shaft (203) on the tension side and in a pad shaft (204) on the reaction side of the brake carrier (2).

3. Disc brake according to claim 1 or 2, characterized in that the pressure piece (306) is designed to act on the application-side brake lining (5) at least when the disc brake is applied.

4. Disc brake according to claim 1, 2 or 3, characterized in that the brake disc (4) preferably has a diameter of 330 mm or more.

5. Disc brake according to one of the preceding claims, characterized in that the brake caliper (3) and the brake carrier (2) each frame-like overlaps an upper edge of the brake disc (4), a central opening (303) for changing the lining in the brake caliper (3) is provided.

6. Disc brake according to one of the preceding claims, characterized in that the brake linings (5, 6) each have a back plate (51, 61) and a friction material (52, 62) and that the friction materials (52, 62) and / or the Back plate (5, 6) are aligned centered in the circumferential direction on the brake disc (4).

7. Disc brake according to one of the preceding claims, characterized in that the back plate (51) has a number of ribs (54) and from recesses / depressions (55).

8. Disc brake according to one of the preceding claims, characterized in that the lining wells of the brake carrier are aligned centered in the circumferential direction bezo gene on the brake disc (4).

9. Disc brake according to one of the preceding claims, characterized in that the pressure piece (306) has a projection which has the Druckflä surface (307) and that the pressure surface in the circumferential direction based on the preferred direction of rotation (D) of the brake disc (4) on the outlet side is staggered.

10. Disc brake according to one of the preceding claims, characterized in that the abutment surface (53) of the back plate is arranged offset in the circumferential direction relative to the preferred direction of rotation (D) of the brake disc (4) on the outlet side.

11. Disc brake according to one of the preceding claims, characterized in that the abutment surface (53) of the back plate (51) of the zuspannsei term brake lining (5) is formed by a shoulder of the back plate.

12. Disc brake according to one of the preceding claims, characterized in that the approach is formed by an element attached to the back plate (51) of the brake lining (5) on the zuspannseiti gene.

13. Disc brake according to one of the preceding claims, characterized in that the element attached to the back plate (51) of the application-side brake lining (5) is a sheet metal element that is fastened to the back plate.

14. Disc brake according to one of the preceding claims, characterized in that the back plate (54) of the brake lining has a recess (56a) which is completely or partially displaced on the running side below the pressure piece relative to the brake disc axis of rotation (M), so that the back plate ( 54) does not touch the pressure piece in the area of the recess and that the brake lining touches the pressure piece during braking in the area next to the recess.

15. Disc brake according to one of the preceding claims, characterized in that by distributing recesses (55) and / or ribs (56) on the back plate (51), the gravity lines and the effective center of gravity of the entire covering (5) and also of the friction material (52) are aligned in the circumferential direction on the central axis M1 of the pressure piston (304).

16. Disc brake according to one of the preceding claims, characterized in that the application device is arranged in the brake caliper (3) on the application side (301) of the brake disc (4) and that the brake caliper (3) surrounds a peripheral region of the brake disc like a frame.

17. Brake pad for a disc brake according to one of the preceding claims, characterized in that it has a single abutment surface (53) for a pressure piston (304) with a pressure surface (307) which is eccentric with respect to its center of gravity (M5).

18. Brake pad for a disc brake according to one of the preceding claims, characterized in that it has a single eccentric abutment surface (53) and that it is essentially semicircular or completely semicircular.

19. Brake pad for a disc brake according to one of the preceding claims, characterized in that its back plate (54) has a recess (56a) which is completely or partially displaced on the inlet side below the pressure piece relative to the brake disc axis of rotation (M), so that the back plate (54) does not touch the pressure piece in the area of the recess.

20. Brake lining for a disc brake according to one of the preceding claims, characterized in that the recess (56a) has a circular segment shape.

21. Brake pad for a disc brake according to one of the preceding claims, characterized in that by distributing recesses (55) and / o the ribs (56) on the back plate (51) the gravity lines and the effective center of gravity of the entire pad (5) and also of the friction material (52) are aligned in the circumferential direction on the central axis M1 of the pressure piston (304).

22.Vehicle with at least one wheel axle, the wheel axle - based on one or the main direction of travel of the vehicle - has a main direction of rotation and the wheel axle at least one disc brake assigned to a left end (and one wheel) of the wheel axle on the left side of the vehicle (1 ) and wherein the wheel axle has at least one disc brake assigned to a right end (and a wheel) of the wheel axle on the right side of the vehicle (1), the disc brake on the left side of the vehicle (1) and the disc brake on the right side of the vehicle (1) are each designed according to one or more of claims 1 to 16