阅读说明：本技术 具有设置在其中的压紧装置的盘式制动器和用于压紧装置的支撑辊 (Disc brake with a clamping device arranged therein and support roller for a clamping device ) 是由 T·克拉斯 M·佩勒 于 2018-07-05 设计创作，主要内容包括：本发明涉及一种盘式制动器,其具有制动钳(1)和设置在其中的、用于向所述盘式制动器的制动衬片施加力的压紧装置,所述压紧装置的组成部分包括能够由力元件和优选压缩空气缸操纵的制动杆(10)。所述制动杆包括杠杆臂(14)和压紧轴(15),所述力元件支撑抵靠所述杠杆臂,所述压紧轴一方面支撑抵靠朝向所述制动衬片的方向工作的压力件(8),并且另一方面从内部支撑抵靠所述制动钳,其方式是：所述制动钳(1)和所述压紧轴(15)彼此面对地分别构造为壳罩(21、22),在所述壳罩中支承有带有横向于压紧方向(Z)延伸的辊轴线(A)的支撑辊(20)。通过尽可能简单的措施而无需附加构件地将所涉及的构件的相互的移动性保持很小,所述支撑辊(20)以其周面(20A)直接支撑在两个所述壳罩(21、22)中的一个壳罩中,并且构造为相对于该壳罩不可相对旋转或可受限地旋转。此外,支撑辊(20)用作用于使制动杆(10)侧向地在制动钳中定心的器件。此外,本发明涉及一种特别适合于这些目的的支撑辊。(The invention relates to a disc brake having a brake caliper (1) and a holding-down device arranged therein for applying a force to a brake lining of the disc brake, the components of the holding-down device comprising a brake lever (10) that can be actuated by a force element and preferably a compressed air cylinder. The brake lever comprises a lever arm (14) against which the force element is supported and a pressure shaft (15) which on the one hand supports a pressure piece (8) which works in the direction of the brake lining and on the other hand supports the brake caliper from the inside in that: the brake caliper (1) and the pressure shaft (15) are each designed as a housing (21, 22) facing each other, in which a support roller (20) having a roller axis (A) extending transversely to the pressure direction (Z) is mounted. The mutual mobility of the components in question is kept small by means of as simple a measure as possible without additional components, the supporting roller (20) being supported with its circumferential surface (20A) directly in one of the two housings (21, 22) and being configured so as to be relatively non-rotatable or limitedly rotatable relative thereto. Furthermore, the support rollers (20) serve as means for laterally centering the brake lever (10) in the brake caliper. The invention also relates to a support roller which is particularly suitable for these purposes.)

1. Disc brake having a brake caliper (1) and a tensioning device arranged therein for applying a force to a brake lining of the disc brake, the components of the tensioning device comprising a brake lever (10) which can be actuated by a force element, preferably a compressed air cylinder, the brake lever comprising a lever arm (14) and a tensioning shaft (15), against which the force element bears, the tensioning shaft bearing on the one hand against a pressure piece (8) which acts in the direction of the brake lining and on the other hand from the inside against the brake caliper, in such a way that: the brake caliper (1) and the pressure shaft (15) are each designed as a housing (21, 22) facing each other, in which a support roller (20) having a roller axis (A) extending transversely to the pressure direction (Z) is mounted, characterized in that the support roller (20) is directly supported with its circumferential surface (20A) in one of the two housings (21, 22) and is designed so as to be non-rotatable or rotatable in a limited manner relative thereto.

2. The disc brake of claim 1, characterized in that the support rollers (20) are configured to be relatively non-rotatable or limitedly rotatable with respect to the housing shell (22) configured on the pressing shaft.

3. The disc brake of claim 1 or 2, characterized in that the support rollers (20) have an asymmetry relative to the roller axis (a) for their non-relative rotation or for their rotational limitation.

4. The disc brake of claim 3, characterized in that the asymmetry consists in a recess (27) on the remaining cylindrical circumferential surface (20A) extending parallel to the roller axis (A).

5. The disc brake of claim 4, characterized in that the recess (27) extends over the same length as the circumferential surface (20A).

6. The disc brake of claim 4 or 5, characterized in that the recess (27) is designed as a flattened section.

7. The disc brake of claim 4, 5 or 6, characterized in that the housing shell (22) comprises two partially circularly curved segments with the same radius (R1) and a flattened section (33) arranged between the segments, which flattened section extends parallel to the roller axis (A), which flattened section projects radially inwards with respect to the radius (R1) of the segments (31, 32).

8. The disc brake of claim 7, characterized in that the flattened section (33) is designed as a channel.

9. The disc brake of claim 7 or 8, characterized in that the width (B1) of the flattened section (33) is smaller than the width (B2) of the recess (27) on the circumferential surface (20A) of the support roller (20), preferably 10 to 30% smaller.

10. The disc brake of any one of claims 7 to 9, characterized in that the radius of the support rollers (20) is maximally equal to the radius (R1) of the segment.

11. Disc brake having a brake caliper (1) and a tensioning device arranged therein for applying a force to a brake lining of the disc brake, the components of the tensioning device comprising a brake lever (10) which can be actuated by a force element, preferably a compressed air cylinder, and which comprises a lever arm (14) and a tensioning shaft (15), against which the force element bears, the tensioning shaft bearing on the one hand against a pressure piece (8) which acts in the direction of the brake lining and on the other hand against the brake caliper (1) from the inside in such a way that: the brake caliper (1) and the pressure shaft (15) are each designed as a housing (21, 22) facing each other, in which a support roller (20) having a roller axis (A) extending transversely to the pressure direction (Z) is mounted, characterized in that the support roller (20) axially abuts the brake caliper (1) with a first surface (F1) for its alignment in the axial direction (A) and axially abuts the pressure shaft (15) of the brake lever (10) with a second surface (F2), wherein the second surface (F2) is oriented opposite the first surface (F1).

12. The disc brake of claim 11, characterized in that the second face (F2) is staggered in the axial direction (a) from the first face (F1).

13. The disc brake of claim 11 or 12, characterized in that the first face (F1) is an end face of the support roller (20) and bears against an alignment face (44) provided internally on the brake caliper.

14. The disc brake of claim 13, characterized in that the first face (F1) is located on the end of a pin (41) provided on the support roller (20) and having a diameter smaller than the diameter of the support roller (20) on its peripheral face (20A) supported in the housing (21, 22).

15. The disc brake of claim 13 or 14, characterized in that the alignment surface (44) is a flat-machined inner surface of the brake caliper (1), the surface normal of which coincides with the roller axis (a).

16. The disc brake of any one of claims 11 to 15, characterized in that the support rollers (20) are provided with a flange (40) which extends radially beyond the circumferential surface (20A) of the support rollers (20) supported in the shells (21, 22), and the second face (F2) is located on the flange (40).

17. The disc brake of claim 16, characterized in that the flange (40) extends only over part of the circumference of the circumferential surface (20A) and is absent on the remaining circumference or present only at a radially reduced height.

18. The disc brake of claim 17, characterized in that the circumferential surface (20A) of the support roller (20) has an asymmetry, preferably a recess (27) on the remaining cylindrical circumferential surface (20A), with respect to the roller axis (a) over the part of the circumference over which the flange (40) extends.

19. The disc brake of any one of claims 11 to 18, characterized in that the second face (F2) bears against an alignment face (45) provided laterally on the pressing shaft (15).

20. The disc brake of claim 19, characterized in that the alignment surface (45) has the configuration of a flat-machined ring segment, wherein the axis (a) of the ring segment preferably coincides with the roller axis.

21. The disc brake of one of the preceding claims, characterized in that the brake caliper-side bearing arrangement is divided into two parts with a first and a second housing shell (21), in which in each case a support roller (20) is supported, and in that the brake caliper is provided with a housing opening (25) between the two housing shells (21), preferably extending in the pressing direction (Z).

22. The disc brake of claim 21, characterized in that the two support rollers (20) are each provided at their ends facing away from one another with an end face (F1) which bears against a lateral alignment face (44) provided internally on the brake caliper (1).

23. The disc brake of claim 21 or 22, characterized in that an additional bearing shell (19) is provided between the housing shell (21) and the support rollers (20), respectively.

24. The disc brake of any one of the preceding claims, characterized in that the pressure shaft (15) is divided into two parts with a first longitudinal section which is arranged on one side of the plane of movement of the lever arm (14) and a second longitudinal section which is arranged on the other side of the plane of movement of the lever arm (14) at a distance from the first longitudinal section, and in that a housing shell (22) is configured on each of the two longitudinal sections, in which housing shells the support rollers (20) are in each case supported directly.

25. Support roller (20) for a clamping device of a disc brake, comprising a circumferential surface (20A) configured between two shells for supporting the support roller and a flange (40) arranged on an end of the circumferential surface (20A), which extends radially beyond the circumferential surface (20A), wherein the support roller (20) has an asymmetry with respect to its roller axis (A) and consists of a recess (27) on the circumferential surface (20A) which is otherwise cylindrical and which extends parallel to the roller axis (A).

26. Backup roll according to claim 25, characterized in that it is provided with a pin (41) in abutment with the flange (40), the diameter of which is smaller than the diameter of the circumferential surface (20A).

27. Backup roll according to claim 25 or 26, characterized in that the flange (40) extends only over a part of the circumference of the circumferential surface (20A) and that no flange or a flange is present only at a radially reduced height over the remaining circumference.

28. Backup roll according to claim 27, characterized in that the circumferential surface (20A) has an asymmetry over the part of the circumference over which the flange (40) extends.

Technical Field

The invention relates to a disc brake having a brake caliper and a hold-down device arranged therein, according to the preamble of claims 1 and 11.

The invention also relates to a support roller for a hold-down device of a disc brake.

Background

Disc brakes are usually provided with a hold-down device in their brake caliper. The pressure device transmits and amplifies the force with which the brake linings arranged on both sides of the brake disk are brought into contact with the brake disk, if necessary, in order to thus achieve a braking effect by friction.

In a conventional disc brake, which is usually actuated by compressed air, the components of the hold-down device comprise a brake lever which is arranged pivotably in the brake caliper. The brake lever comprises a lever arm and a pressure shaft which is configured in cross section like an eccentric wheel. The force element of the disk brake is supported on a lever arm, for example, by a compressed air cylinder in the case of a compressed air-actuated disk brake. The brake lever has a pressure shaft which, on the one hand, bears against a pressure piece which works in the direction of the brake lining towards the vehicle interior and, on the other hand, bears against the rear side of the brake caliper housing.

Disc brakes having the above-described features are known from DE 19515063C 2 and DE 102012006089 a1, wherein, for supporting the brake lever on the rear, i.e. on the brake caliper side, on the one hand the inner face of the brake caliper and on the other hand the pressing shaft of the brake lever are designed as shells facing one another. A support roller having a roller axis extending transversely to the pressing direction is supported in the housing. In the case of the design according to DE 19515063C 2, the supporting rollers are of one piece, whereas in the case of the design according to DE 102012006089 a1, two separate supporting rollers are used, since the clamping shaft of the brake lever is also divided into two parts with a first longitudinal section and a second longitudinal section, between which there is a free space for accommodating the adjusting device. In order to center the support roller in the direction of its roller axis relative to the brake lever, an additional complex sheet metal shaped part is fastened to the brake lever. The web on the sheet-metal forming part prevents the supporting roller from moving along its axis relative to the brake lever.

Disclosure of Invention

The object of the invention is to provide a disk brake with a hold-down device arranged in its brake caliper, which additionally comprises a pivotable brake lever, in which the mutual mobility of the components involved is kept small by means of the simplest possible measures without additional components. Furthermore, support rolls particularly suitable for these purposes should be provided.

In order to achieve this object, a disc brake having the features of claims 1 and 11 and a support roller for a holding-down device of a disc brake having the features of claim 25 are proposed.

In a first embodiment, the disk brake is characterized in that the support roller is supported with its circumferential surface directly in one of the two shells and is designed to be non-rotatable or rotatable to a limited extent relative to this shell.

In a second configuration, the disk brake is characterized in that the support rollers, for their alignment in the axial direction, bear axially with a first face against the brake caliper and with a second face against the clamping shaft of the brake lever, wherein the second face is oriented opposite the first face.

The support roller for a clamping device of a disc brake according to the invention is characterized in that a circumferential surface for supporting the support roller between two shells and a flange arranged at one end of the circumferential surface, which extends radially beyond the circumferential surface, is formed, wherein the support roller has an asymmetry with respect to its roller axis and the asymmetry consists of a depression or a flattened section on the remaining cylindrical circumferential surface, which extends parallel to the roller axis.

By means of these measures in a disc brake with a pressing device with a pivotable lever, the mutual mobility of the components involved, in particular transversely to the pressing direction, can be kept small by simple measures and without additional components.

Different configurations of the disc brake according to the invention and of the support roller according to the invention are described in the dependent claims.

According to one embodiment of the disk brake, the support roller is configured to be non-rotatable or at most limitedly rotatable relative to a housing formed on the pressure shaft. This is preferably achieved by: the support rollers have an asymmetry with respect to the roller axis in order to achieve no relative rotation or rotational limitation. Preferably, the asymmetry consists in a depression on the remaining cylindrical circumferential surface of the support roller, which depression extends parallel to the roller axis.

According to one embodiment, the housing cover, which is formed directly on the pressure shaft of the brake lever, comprises two partially circular curved segments having the same radius and a flattened section, which is arranged between the segments and extends parallel to the roller axis, wherein the flattened section projects radially inward with respect to the radius of the segments. For example, the flattened area can be designed as a flat channel, which forms the base of the housing.

Furthermore, the width of the flattened section is smaller than the width of the recess on the circumferential surface of the support roller, preferably by 10% to 30%.

In a second embodiment of the disk brake according to the invention, the support rollers, for their alignment in the axial direction, bear axially with the first surface against the brake caliper and with the second surface against the clamping shaft of the brake lever. The second face is oriented opposite the first face, and preferably the second face is offset from the first face in the axial direction.

The support rollers preferably present as support roller pairs therefore are not only support means when transmitting the brake contact pressure, but also lateral alignment means which align the brake lever transversely to the contact pressure direction and thus laterally center it in the brake caliper housing.

In order to align the components in question with one another, it is furthermore provided that the first surface is an end surface of the support roller and abuts against an inner alignment surface provided on the brake caliper.

In an advantageous embodiment, it is provided that the first surface is located at the end of a pin arranged on the support roller, the diameter of which pin is smaller than the diameter of the support roller on its circumferential surface supported in the housing.

Preferably, the alignment surface provided internally on the brake caliper is a flat-machined inner surface of the brake caliper, the surface normal of which coincides with the axis of rotation of the support roller.

Preferably, the support roller is provided with a flange which extends radially beyond the circumferential surface of the support roller which is supported in the housing, wherein the second surface is located on the flange.

Due to the small space inside the brake caliper, it is advantageous if the flange with the second face formed thereon extends only over a part of the circumference of the circumferential surface of the support roller, i.e. over that part of the circumference of the flange which is responsible for the axial support. In this case, there is no flange on the remaining periphery, or only a flange at a radially reduced height.

In addition, it is provided in the case of the support roller that the circumferential surface of the support roller has an asymmetry with respect to the roller axis over the part of the circumference over which the flange extends. The asymmetry is preferably a depression in the remaining cylindrical circumference.

In order to align the components in question with one another, it is also provided that the second surface bears against an alignment surface arranged laterally on the pressure shaft. The alignment surface may have the configuration of a flat machined annular segment. If, in addition, the axis of the ring segment coincides with the roll axis, the respective housing shell and ring segment can be produced in a common milling or drilling process.

In principle, the support roller, which is preferably made of steel, can be the only support roller which is continuous over the length of the clamping shaft of the brake lever. However, a configuration using two support rollers is preferable. According to this configuration, the bearing arrangement on the caliper side is divided into two parts, comprising a first and a second housing, in each of which a support roller is mounted, wherein the caliper is provided with a housing opening between the two housings. The housing opening in this position of the brake caliper has several advantages. Thus, a tool can be guided through the housing opening, with which the inner machining of the brake caliper takes place when the brake caliper is manufactured. In the case of an assembled ready-to-operate disc brake, this housing opening can be used, for example, to reset an adjusting device of the disc brake arranged behind it after a new brake lining has been replaced and inserted.

Preferably, the two support rollers are each provided at their ends facing away from each other with an end face which bears against an inner lateral alignment face provided on the brake caliper.

The support rollers can be supported directly on a housing cover formed on the rear side of the brake caliper. However, a design in which an additional bearing shell is provided between the housing shell on the caliper side and the support roller, respectively, is preferred here. This has the advantage that when the bearing is worn, the brake caliper does not have to be replaced, but rather an additional bearing shell is sufficient.

In the case of a design with two separate supporting rollers, the brake lever clamping shaft is also divided into two parts with a first longitudinal section, which is arranged on one side of the plane of movement of the lever arm, and a second longitudinal section, which is spaced apart from the first longitudinal section and is arranged on the other side of the plane of movement of the lever arm. A housing is formed on each of the two longitudinal sections, in which the support rollers are then each supported directly, i.e. without an additional bearing housing.

It is advantageous for this configuration of the support rollers that the support rollers are provided with pins adjacent to the flange, the diameter of the pins being smaller than the diameter of the circumferential surface of the support rollers. The flange extends only over a part of the circumference of the circumferential surface, while on the remaining circumference no flange or only at a radially reduced height is present. In this case, the circumferential surface has an asymmetry over the part of the circumference over which the flange extends.

Drawings

Further advantages and details emerge from the following description with reference to the drawings. In which is shown:

FIG. 1 shows a side view of a brake caliper and a brake disc of a commercial vehicle disc brake;

FIG. 2 shows a longitudinal section through a section of the brake caliper indicated by II in FIG. 1;

FIG. 3 shows a perspective view of the internal bearing surface on the caliper rear wall of the brake caliper;

FIG. 4 shows a support surface including a bearing shell placed there;

fig. 5 shows a perspective view of the bearing shell designed as a trough in isolation;

FIG. 6 shows another longitudinal cross-sectional view of the caliper rear wall, bearing surface and bearing shell placed thereon;

FIG. 7 shows an exploded view of a caliper, two support rollers and a brake lever of the disc brake;

FIG. 8 shows the object of FIG. 7 in a slightly staggered perspective view;

FIG. 9a shows a cross section of the supporting rollers in the region of the supporting rollers abutting the brake lever; and

fig. 9b shows the object in fig. 9a in a changed rotational position of the support rollers.

Detailed Description

Fig. 1 and 2 show a brake caliper 1 of a disc brake, which here is of the type of a compressed air-actuated commercial vehicle brake of the sliding caliper or floating caliper type. The brake caliper 1 cast in one single piece consists of three segments. The first caliper section 11, which is located in the vehicle interior in the assembled brake, is provided with a hollow space 7 in its interior, which provides space for the brake application device. In the assembled brake, a second caliper section 12 is located outside the vehicle, which second caliper section is arranged on the opposite side of the brake disc 2 of the disc brake. The two caliper segments 11, 12 are connected to one another by a bridge segment 13, which bridges the brake disk 2 and in this case provides a free space for at least one section of the brake disk 2 and for brake linings.

The brake caliper 1 is in one piece, since the two caliper segments 11, 12 and the bridge segment 13 are formed from a single part. The first jaw section 11 is open towards the free space of the bridge section 13. The opening serves also as a mounting opening and is so large that the holding-down device can be mounted through it. The opening is closed by a cover after the brake assembly is completed.

The two brake linings of the disk brake are not shown in the drawing. The first brake lining is located on the right side of the brake disk 2 in fig. 1. The brake linings on the pressure side are actuated directly by the pressure device arranged in the hollow space 7 of the caliper section 11 and are thus pressed against the brake disk 2. The second brake lining is arranged on the caliper section 12 outside the vehicle and occupies a fixed position there. The second brake lining is a reaction-side brake lining.

The task of the pressing device is to amplify the braking force generated by the force element and to transmit it in a pressing direction Z extending parallel to the axis of rotation of the brake disc 2.

The compressing device comprises the following components: two support rollers 20 rotatably supported against the caliper rear wall 18; a brake lever 10 which is pivotably arranged in the brake caliper housing; and a pressure element 8, which is operated in the direction of the brake lining in the vehicle interior, i.e. on the pressure side.

The pressure element 8 has the form of a cross member extending transversely to the pressing direction Z. In the middle of the cross member 8, it is connected by means of a thread to a pressure ram which bears against the brake lining on the pressure side and can thus load the brake lining against the brake disk 2.

The pivotable brake lever 10 is fork-shaped and comprises a lever arm 14 and a pressing shaft 15 divided into two longitudinal sections. The pressure shaft 15 is supported on the one hand on the support rollers 20 relative to the caliper rear wall 18, which closes the hollow space 7 away from the brake disk. As a component of this support device, a bearing shell 19 which can be exchanged in the event of wear is respectively arranged between each of the two longitudinal sections of the pressure shaft 15 and a housing shell 21 which is formed on the caliper rear wall 18 in an internally fixed manner. The bearing shells are designed as partial cylindrical grooves, like the housing shells 21, and the corresponding support rollers 20 are rotatably supported on the bearing shells 19, which are designed as partial cylindrical grooves, like the housing shells 21. For this purpose, the support rollers 20 are cylindrical over a major part of their circumference and have a radius equal to the inner radius of the bearing shell 19.

In the other direction, i.e. in the pressing direction Z, the pressing shaft 15 is pivotably supported on the pressure element 8 by means of a further pivot bearing 17. For this purpose, the pressure element 8 has a support region in the form of a half-shell. The further pivot bearing 17 is designed here as a rolling bearing.

In order to achieve a high contact pressure, the pressure shaft 15 is mounted eccentrically. Because the pivot bearings supported on the brake caliper, which are defined by the axes a of the support rollers 20, are offset in height compared to the pivot axis of the pivot bearing 17 provided between the pressure shaft 15 and the pressure element 8. Thus, when the eccentric profiled pressing shaft 15 rotates, a forward movement of the pressure piece 8 in the pressing direction Z takes place, whereby the brake is pressed and a braking force is applied.

A lever arm 14 formed integrally on the pressure shaft serves to rotate the pressure shaft 15. The lever arm has a support position near its free end, to which the force element of the disc brake is operated. In the case of a compressed-air-actuated disc brake, the force element is a pneumatic brake cylinder which is supplied with compressed air by the compressed air system of the vehicle.

Brake lever 10 is generally fork-shaped in that it branches off into two legs starting from a lever arm 14 arranged on the pivot center line. The first longitudinal section is located on the first leg and the second longitudinal section of the hold down shaft 15 is located on the second leg. Brake lever 10 has a free space between these two longitudinal sections. This free space and, in addition, the central part of the pressure element 8, which is provided with a threaded hole, provide sufficient space for the adjustment device. The adjusting device is designed to compensate for wear of the brake over time and to correct the air gap of the brake. The adjusting device comprises the following components: a drive element, an output element to reduce an air gap of the brake, a one-way clutch, and an overload element. The output element of the adjustment device may be a spindle. The spindle is provided with an external thread which is screwed into a threaded hole in the central part of the pressure piece 8.

Most of the individual components of the adjusting device are arranged on the adjusting axis. Which lies on the pressing axis Z and at the same time extends perpendicularly to the plane in which the brake disc 2 extends.

Since the pressure shaft 15 is divided into two longitudinal sections, two spatially separated, trough-shaped housings 22 are formed on the brake lever 10 for supporting each support roller 20. In addition, the bearing shell 19 is also present twice.

One housing shell 22 with its supporting roller 20 is located on one side of a plane in which the lever arm 14 of the brake lever 10 performs its pivoting movement, while the other housing shell 22 with its supporting roller 20 is located on the other side of a plane in which the lever arm 14 of the brake lever 10 performs its pivoting movement.

Between the two other housings 21, which are formed on the rear tong wall 18 and preferably also on the adjustment axis of the adjustment device, there is an opening 25 in the rear tong wall 18. This opening provides space for the reset element of the reset device in assembling the ready-to-operate brake. Since the brake linings of disk brakes wear out, they must be replaced. The adjusting device must then be reset into its starting position, which is achieved by the reset device mentioned. The reset element of the reset device is located in the opening 25 of the caliper rear wall 18 and is provided with a key surface onto which a corresponding tool can be placed for resetting the brake.

The two housing shells 21 of the rear tong wall 18 are each designed as a partial cylindrical groove for the bearing shells 19 which can be replaced when they are worn. This simplifies the manufacturability of the shells 21, in particular the alignment of the shells 21 with respect to one another.

As shown in fig. 4, each shell 21 is constructed for technical reasons on a platform cast internally on the back wall 18 of the pliers. Each housing shell 21 is machined according to fig. 3, wherein a machined groove-shaped surface in the shape of an H is obtained. Since the face comprises two wider bearing face sections and a narrower intermediate section arranged between them. The narrower intermediate section is caused by two cutouts, which are provided by the casting process. A wing-like attachment piece 19A of the bearing shell 19 projects into each cutout. The outer side of the bearing shell 19 extends further in the circumferential direction than the narrow middle section of the housing shell 21. In this way, the bearing housing 19 can move slightly in the circumferential direction on the housing cover 21. But this possibility of movement is limited in both circumferential directions.

Each bearing shell 19 is preferably made of an originally flat metal sheet produced by stamping and deformation, which metal sheet has a plain bearing coating. The outer side, which is curved in a partial cylindrical manner, lies flat against the housing shell 21. The supporting rollers 20 rest with their cylindrical circumferential surfaces 20A on the partially cylindrical inner side of the bearing shell 19, so that the supporting rollers 20 are supported freely rotatably about their roller axes a in the bearing shell 19.

On the other hand, as will be explained below with reference to fig. 9a, 9b, the support roller 20 cannot rotate freely relative to its other housing, namely the housing 22 formed directly on the pressing shaft 15. Here, however, no rotational mobility or at least a substantial reduction of the rotational mobility is achieved by: the support rollers 20 are designed to be relatively non-rotatable or limited in rotational movement with respect to the housing 22. This is achieved by asymmetry about the roll axis a. The asymmetry consists in a flattened section 27 of the remaining cylindrical circumferential surface 20A extending parallel to the roller axis a. The flattened portion 27 extends over the same axial length as the peripheral surface 20A. The flattened portion 27 extends in the circumferential direction at an angle of less than 80 °, while the remaining circumference is cylindrical.

The faces of the housing 22 against which the support rollers directly bear are not exactly part-cylindrical and are therefore also asymmetrical relative to the axis a. Whereas the casing 22 comprises circumferentially two part-circular or part- cylindrical sections 31, 32 having the same radius R1 and the same reference point for these radii, and a flattened portion 33 provided on the bottom of the casing 22 between the sections 31, 32. The flattened section 33 results in asymmetry and extends parallel to the roll axis a. The flattened section 33 projects radially inwards compared to the sections 31, 32 in such a way that: the distance a1 measured radially between the roller axis a and the flattened section 33 is at least partially smaller than the radius R1 of the shell segment 31, 32.

In order to limit the rotatability of the support roller 20 in relation to the housing 22 with precision, the width B1 of the flattened section 33 in the housing 22 is smaller and preferably 10 to 30% smaller than the width B2 of the flattened section 27 on the support roller 20, which lies at a small radial distance opposite the flattened section 33.

Fig. 9b shows the following: in this case, the edge 36 present in the transition between the cylindrical circumferential surface 20A and the flattened section 27 abuts against the flattened section 33 on the bottom of the housing shell 22. From the rotational position reached, the support rollers 20 can no longer rotate relative to the housing shell 22. The maximum possible rotation angles in both directions of rotation are 6 ° due to the flattened sections 27, 33.

The radius R1 of the shell segments 31, 32 is slightly larger than and in any case not smaller than the radius of the cylindrical portion of the peripheral surface 20A. The support rollers 20 can therefore have some radial play in the housing shell 22 in order to avoid excessively high and therefore expensive manufacturing accuracies when machining the surface of the component. Although, due to the presence of the recesses 27, 33 lying opposite one another, a good abutment of the support roller 20 in the housing shell 22 is still achieved.

The support rollers 20 are ground so that grooves on the cylindrical peripheral surfaces 20A of the support rollers extend in the circumferential direction. For small wear on the surface, it is advantageous if the segments 31, 32 are reinforced with a grinding, milling or drilling tool rotating about the axis a, the grooves produced in this case extending in the circumferential direction.

Fig. 7 and 8 show the two support rollers 20 and the brake lever 10 still before final assembly. Each support roller 20 has three sections in its longitudinal direction, namely first an actual support section with a circumferential surface 20A, second a flange 40 adjoining it and third a pin section 41 adjoining the flange 40 and forming the end of the support roller 20. The flanges 40 and the ends of the support roller 20 are designed such that the support roller 20 bears with the first face F1 against the brake caliper 1 and with the second face F2 against the brake lever 10 in the axial direction a.

The second face F2 is oriented opposite to the first face F1. Further, the second face F2 is provided to be offset from the first face F1 in the axial direction a. The first face F1 is a free end face of the pin 41. The free end face is of flat configuration and lies opposite an alignment face 44 formed directly on the caliper 1 with little play. The two alignment surfaces 44 are the sides of the caliper 1 which face each other on the inside, the surface normals of which coincide with the axis a of the support roller. Both alignment surfaces 44 are machined flat, for example by grinding or milling.

Due to the limited space in the interior of the brake caliper, the pin 41 has a diameter which is smaller than the diameter of the support roller 20 on its circumferential surface 20A supported in the shells 21, 22.

The flange 40 arranged between the circumferential surface 20A and the pin 41 extends radially beyond the cylindrical circumferential surface 20A of the support roller. In this manner, one side of the flange 40 forms the second alignment face F2. This face F2 is opposed to the alignment face 45 formed directly on the brake lever 10 with almost no gap in the roller longitudinal direction. The faces F2 of the two support rollers 20 face each other.

Respective ones of the alignment surfaces 45 are located on each side of the hold down shaft 15. Each alignment surface 45 has the configuration of an annular segment, which can be machined flat or planar. The reference axis of the ring segments coincides with the roll axis a of the support rolls, which is advantageous in the manufacture of the casing 22.

The two support rollers 20 are not only supporting means when transmitting the braking contact force, but they are also lateral alignment means, i.e. alignment means transverse to the contact direction Z. Since each support roller 20 abuts the alignment face 44 of the caliper 1 with the face F1, the support roller 20 is laterally aligned or centered with respect to the caliper. At the same time, the second face F2 provided on the radially widened flange 40 of each support roller abuts against the alignment face 45 on the respective side of the brake lever 10. In interaction, a lateral alignment or centering of brake lever 10 relative to the housing of brake caliper 1 is achieved. Here, the first supporting roller 20 is responsible for the alignment of the brake lever 10 in one transverse direction, and the second supporting roller 20 is responsible for the alignment of the brake lever 10 in the other transverse direction, i.e. the opposite transverse direction.

Therefore, no additional elements or components are required to center brake lever 10 in brake caliper 1 transversely to clamping direction Z. At the same time, the flanges 40 prevent the respective support roller 20 from moving in the direction of the centrally located free space between the two longitudinal sections of the pressing shaft 15. Since the components of the holding-down device and/or the adjusting device are present in this free space, no collision with them occurs.

This surface F2 does not rest against the brake lever 10 over the entire circumference, but only over a circumferential section. Thus, it is not necessary that the flange extend over the entire circumference. Instead, as can be seen from fig. 7 and 8, the flange 40 extends only over a part of the circumference of the support roller 20, while on the remaining circumference no flange or only at a radially reduced height is present.

The support roller 20 has the described asymmetry, i.e. the depression or flattened portion 27, on the portion of the periphery of the flange 40 where the face F2 is located. This fixes the specific rotational position of the support roller 20 in the housing shell 22 and has structural advantages. Since the space in the two corresponding corner regions of the caliper 1 is very small, as shown, for example, in fig. 3 and 4. The flange 40 around the entire circumference of the support roller 20 will have a risk of colliding with an inner face or shoulder on the brake caliper 1.

List of reference numerals

1 brake caliper

2 disc brake

7 hollow space

8 pressure piece

10 brake lever

11 clamp section

12 clamp section

13 bridge section

14 lever arm

15 pressing shaft

17 Pivot bearing

18 pincers back wall

19 bearing shell

19A connecting sheet

20 support roller

20A peripheral surface

21 casing

22 casing

25 opening

27 concave, flat-cut part

31 paragraph

32 section

33 cutting flat part

36 edge

40 Flange

41 pin

44 alignment surface

45 alignment surface

Axis A, roll axis

A1 distance

B1 width

B2 width

F1 first side

Second side of F2

Radius R1

Angle of rotation of W

Direction of Z compression

The claims (modification according to treaty clause 19)

1. Disc brake having a brake caliper (1) and a tensioning device arranged therein for applying a force to a brake lining of the disc brake, the components of the tensioning device comprising a brake lever (10) which can be actuated by a force element, preferably a compressed air cylinder, the brake lever comprising a lever arm (14) and a tensioning shaft (15), against which the force element bears, the tensioning shaft bearing on the one hand against a pressure piece (8) which acts in the direction of the brake lining and on the other hand from the inside against the brake caliper, in such a way that: the brake caliper (1) and the pressure shaft (15) are each designed as a housing (21, 22) facing each other, in which a support roller (20) having a roller axis (A) extending transversely to the pressure direction (Z) is mounted, wherein the support roller (20) is directly supported with its circumferential surface (20A) in one of the two housings (21, 22) and is designed so as to be rotationally fixed or rotationally fixed relative thereto, characterized in that the support roller (20) has an asymmetry relative to the roller axis (A) for its non-relative rotation or rotational limitation.

2. The disc brake of claim 1, characterized in that the support rollers (20) are configured to be relatively non-rotatable or limitedly rotatable with respect to the housing shell (22) configured on the pressing shaft.

3. The disc brake of claim 1, characterized in that the asymmetry consists in a recess (27) on the remaining cylindrical circumferential surface (20A) extending parallel to the roller axis (a).

4. The disc brake of claim 3, characterized in that the recess (27) extends over the same length as the circumferential surface (20A).

5. The disc brake of claim 3 or 4, characterized in that the recess (27) is designed as a flattened section.

6. The disc brake of claim 3, 4 or 5, characterized in that the housing shell (22) comprises two partially circularly curved segments with the same radius (R1) and a flattened section (33) arranged between the segments, which flattened section extends parallel to the roller axis (A), which flattened section projects radially inwards with respect to the radius (R1) of the segments (31, 32).

7. The disc brake of claim 6, characterized in that the flattened section (33) is designed as a channel.

8. The disc brake of claim 6 or 7, characterized in that the width (B1) of the flattened section (33) is smaller than the width (B2) of the recess (27) on the circumferential surface (20A) of the support roller (20), preferably 10 to 30% smaller.

9. The disc brake of any one of claims 6 to 8, characterized in that the radius of the support rollers (20) is maximally equal to the radius (R1) of the segment.

10. Disc brake having a brake caliper (1) and a tensioning device arranged therein for applying a force to a brake lining of the disc brake, the components of the tensioning device comprising a brake lever (10) which can be actuated by a force element, preferably a compressed air cylinder, and which comprises a lever arm (14) and a tensioning shaft (15), against which the force element bears, the tensioning shaft bearing on the one hand against a pressure piece (8) which acts in the direction of the brake lining and on the other hand against the brake caliper (1) from the inside in such a way that: the brake caliper (1) and the pressure shaft (15) are each designed as a housing (21, 22) facing each other, in which a support roller (20) having a roller axis (A) extending transversely to the pressure direction (Z) is mounted, wherein the support roller (20) for its alignment in the axial direction (A) bears axially with a first face (F1) against the brake caliper (1) and with a second face (F2) against the pressure shaft (15) of the brake lever (10), wherein the second face (F2) is oriented opposite the first face (F1), characterized in that the first face (F1) is an end face of the support roller (20) and bears against an alignment face (44) arranged internally on the brake caliper.

11. The disc brake of claim 10, characterized in that the second face (F2) is staggered in the axial direction (a) from the first face (F1).

12. The disc brake of claim 10, characterized in that the first face (F1) is located on the end of a pin (41) provided on the support roller (20) and having a diameter smaller than the diameter of the support roller (20) on its peripheral face (20A) supported in the housing (21, 22).

13. The disc brake of claim 10, characterized in that the alignment surface (44) is a flat machined inner surface of the brake caliper (1), the surface normal of which coincides with the roller axis (a).

14. The disc brake of any one of claims 10 to 13, characterized in that the support rollers (20) are provided with a flange (40) which extends radially beyond the circumferential surface (20A) of the support rollers (20) supported in the shells (21, 22), and the second face (F2) is located on the flange (40).

15. The disc brake of claim 14, characterized in that the flange (40) extends only over part of the circumference of the circumferential surface (20A) and is absent on the remaining circumference or present only at a radially reduced height.

16. The disc brake of claim 15, characterized in that the circumferential surface (20A) of the support roller (20) has an asymmetry, preferably a recess (27) on the remaining cylindrical circumferential surface (20A), with respect to the roller axis (a) over the part of the circumference over which the flange (40) extends.

17. The disc brake of any one of claims 10 to 16, characterized in that the second face (F2) bears against an alignment face (45) provided laterally on the pressing shaft (15).

18. The disc brake of claim 17, characterized in that the alignment surface (45) has the configuration of a flat-machined ring segment, wherein the axis (a) of the ring segment preferably coincides with the roller axis.

19. The disc brake of one of the preceding claims, characterized in that the brake caliper-side bearing arrangement is divided into two parts with a first and a second housing shell (21), in which in each case a support roller (20) is supported, and in that the brake caliper is provided with a housing opening (25) between the two housing shells (21), preferably extending in the pressing direction (Z).

20. The disc brake of claim 19, characterized in that the two support rollers (20) are each provided at their ends facing away from one another with an end face (F1) which bears against a lateral alignment face (44) provided internally on the brake caliper (1).

21. The disc brake of claim 19 or 20, characterized in that an additional bearing shell (19) is provided between the housing shell (21) and the support rollers (20), respectively.

22. The disc brake of any one of the preceding claims, characterized in that the pressure shaft (15) is divided into two parts with a first longitudinal section which is arranged on one side of the plane of movement of the lever arm (14) and a second longitudinal section which is arranged on the other side of the plane of movement of the lever arm (14) at a distance from the first longitudinal section, and in that a housing shell (22) is configured on each of the two longitudinal sections, in which housing shells the support rollers (20) are in each case supported directly.

23. Support roller (20) for a clamping device of a disc brake, comprising a circumferential surface (20A) configured between two shells for supporting the support roller and a flange (40) arranged on an end of the circumferential surface (20A), which extends radially beyond the circumferential surface (20A), wherein the support roller (20) has an asymmetry with respect to its roller axis (A) and consists of a recess (27) on the circumferential surface (20A) which is otherwise cylindrical and which extends parallel to the roller axis (A).

24. Support roller according to claim 23, characterized in that it is provided, in abutment with the flange (40), with a pin (41) having a diameter smaller than the diameter of the peripheral surface (20A).

25. Backup roll according to claim 23 or 24, characterized in that the flange (40) extends only over a part of the circumference of the circumferential surface (20A) and that no flange or a flange is present only at a radially reduced height over the remaining circumference.

26. Backup roll according to claim 25, characterized in that the circumferential surface (20A) has an asymmetry over the part of the circumference over which the flange (40) extends.