Swivel bearing, swivel lever arrangement and clamping arrangement

Abstract

A pivot bearing (1) for supporting a pivot lever (30) of a clamping device (50) of a disc brake, wherein the pivot bearing (1) has an arcuate bearing shell (16) and a rolling bearing cage (2) pivotably guided thereon, wherein the rolling bearing cage (2) has at least one guide wing (21) projecting axially to the pivot axis (A), which has only on one side an axially extending stop surface (10) for returning the rolling element cage (2); and a pivot lever arrangement and a clamping device.

Description

[0001] The present invention relates to a pivot bearing according to the preamble of claim 1, as well as a pivot lever arrangement and a clamping device.

[0002] From the state of the art, pivot bearings are known, for example, from DE 10 2004 031 792 A1 or from EP 3 129 668 B1 and corresponding pivot lever arrangements from EP 3 112 718 A1.

[0003] DE 10 2020 101 014 B3 also discloses a pivot bearing assembly with a return element and a return counter element, which are connected to each other via a wing section and a groove section, with the wing section lying in the groove. However, such a groove section must be attached to the pivot lever in a complex process.

[0004] Based on this, the object of the present invention is to realize a simpler and thus easier-to-manufacture return.

[0005] The invention solves this problem by the subject matter of claim 1.

[0006] According to the invention, a pivot bearing for supporting a pivot lever of an application device of a disc brake is provided, wherein the pivot bearing has an arcuate bearing shell and a rolling bearing cage pivotably guided thereon.

[0007] The rolling bearing cage has a guide vane that protrudes axially relative to the pivot axis. However, this guide vane only has an axially extending stop surface on one side for guiding the rolling element cage back.

[0008] In contrast to the aforementioned state of the art, the one-sided return is based on the realization that a two-sided return is not absolutely necessary, especially since the pivot bearing also has a stop stop which prevents the bearing from pivoting too far.

[0009] It is advantageous if the stop surface is designed as the edge of the guide wing. This ensures that the stop of the guide wing remains permanently stable.

[0010] It is also advantageous if the edge of the guide wing opposite the stop surface is designed as a wing stiffener with an arcuate longitudinal profile. This further counteracts deformation of the guide wing. At the same time, the guide wing can be dimensioned smaller.

[0011] The bearing shell can advantageously be designed as a sheet metal strip, with the bearing shell extending in a curved plane over a continuous area of ​​more than 80% of its longitudinal extension. This creates a particularly flat pivot bearing with a small installation space requirement.

[0012] The bearing shell is advantageously locked to the rolling element cage.

[0013] The rolling element cage preferably has one or more locking elements, in particular one or more resilient locking strips, which are locked to a corresponding locking element of the bearing shell, in particular one or more recessed grooves. The locking can advantageously be implemented on both longitudinal sides of the bearing shell for force distribution.

[0014] The guide wing can advantageously be formed in one piece with the rolling element cage so that it has particular strength.

[0015] The rolling element cage has bearing pockets for supporting rolling elements, in particular needle roller bearings. The bearing pockets have retaining webs for holding the rolling elements, which are arranged on only one side of a bearing pocket. This allows for easy insertion of the rolling elements into the needle roller bearing from the rear.

[0016] Furthermore, according to the invention, a pivot lever arrangement comprises a pivot lever and a pivot bearing, preferably a pivot bearing according to the invention, wherein the pivot bearing has an arcuate bearing shell and a rolling bearing cage pivotably guided thereon.

[0017] The rolling bearing cage has a guide wing projecting axially to the pivot axis, with a stop surface which, together with a corresponding return element formed on the pivot lever, has a stop on only one side for returning the rolling bearing cage.

[0018] The realization that a one-sided stop is sufficient for return enables a significant structural simplification of the pivot lever arrangement compared to the state of the art.

[0019] To improve inherent stability against deformation, it is advantageous if the return element is designed as an increasingly tapered radial projection.

[0020] Particularly preferably, the return element has a contour that tapers towards a curved point, allowing the guide vane to be guided along the return element until it reaches the end position of the stop. Surprisingly, the guide vane did not overrun or jam on the return element.

[0021] The return element can advantageously be arranged at the end of a guide surface for guiding the pivot lever within a brake calliper and can preferably be formed integrally, in particular monolithically, with the rest of the pivot lever.

[0022] Particular advantages in the manufacturing process arise when the return element is designed as a milling run-out. A milling run-out is easy for the specialist to identify. It is located at the end of a machined surface. The resulting surface profiles make the post-processing process readily recognizable.

[0023] Application device of a disc brake comprising a brake calliper and a pivoting lever arrangement according to one of the preceding claims, which is supported in a contour in the brake calliper.

[0024] The aforementioned guide surface, as part of the pivot lever, can advantageously be part of a guide horn or arranged adjacent to it, which, when the pivoting movement is performed, plunges into a recess within the brake caliper. Thus, the guide surfaces provide guidance within the recess.

[0025] Each side of the pivot lever can advantageously have only one lateral support of the bearing shell in the brake calliper, wherein the arrangement of the support points is arranged diagonally to each other.

[0026] A pivot bearing according to the invention, a pivot lever arrangement according to the invention, and a clamping device according to the invention are explained in more detail below with the aid of the accompanying figures. They show: Fig. 1 a rear view of a pivot bearing according to the invention of the preceding figures; Fig. 2 a side view of the pivot bearing; Fig. 3 a first perspective view of the pivot bearing; Fig. 4 a second perspective view of the pivot bearing; Fig. 5 a perspective view of a rolling element cage of the pivot bearing of the previous figures; Fig. 6a a plan view of a pivot lever for receiving the pivot bearing; Fig. 6b a side sectional view of the pivot lever of the Fig. 6a; Fig. 7 a perspective view of the pivot lever of the Fig. 6a and Fig. 6b; Fig. 8a a plan view of a pivot lever arrangement according to the invention; Fig. 8b a side sectional view of the pivot lever arrangement of the Fig. 8a; Fig. 9 a perspective view of the toggle lever arrangement of the Fig. 8a and Fig. 8b; Fig. 10 a sectional view of a clamping device according to the invention; and Fig. 11 the sectional view of the Fig. 10 with swivel lever removed.

[0027] Fig. 1-5 shows in detail the pivot bearing 1 in the design as a needle bearing for a disc brake, which can be used in particular for mounting the above-described pivot lever, which is also synonymously referred to as a rotary lever or brake lever, e.g. on the brake caliper 51 of a disc brake, as is known e.g. under the product designations SN6 or SN7 or in a similar design e.g. from DE 4204307 A (see the roller bearing 3 therein) or DE 197 31 696 A. With regard to the structure of such disc brakes, which will otherwise not be discussed further here, reference is made in full to these documents. The pivot bearing 1 has a pivot axis A.

[0028] The Fig. The pivot bearing 1 shown in Figures 1-5, which is designed as a needle or roller bearing, has a circular arc-shaped bearing shell 16 and a rolling element cage 2 which can be pivoted relative to it, between which a set of rolling elements 18, here in the form of bearing needles, is arranged in such a way that the bearing shell 16 is mounted on rolling elements, in particular roller bearings, so as to be movable relative to the rolling element cage 2.

[0029] The rolling element cage 2 can preferably be made of plastic and is provided with two lateral side ribs 5a, 5b oriented outwards perpendicular to the rolling element cage and having guide surfaces directed towards the bearing needles 18. The opposite side ribs 5a, 5b, together with two opposite end ribs, which each have the front end surfaces 12 and 13 of the rolling element cage, define a receiving space for the bearing needles 18. The receiving space is divided into bearing pockets 4, which are defined on one side by retaining webs 3 running parallel to the pivot axis A between the side ribs 5a, 5b. The retaining webs 3 prevent the rolling elements 18, e.g. the bearing needles, from falling out on the inside in the radial direction during assembly of the pivot bearing 1. At the rear, falling out is prevented by the bearing shell 16.

[0030] Guide means 6a and 6b, for example, arcuate projections, extend parallel to the side edges 5a, 5b. The guide means 6a and 6b extend toward the bearing shell 16 and enclose it laterally in a U-shape. In addition to the guide means 6a and 6b protruding from a side edge 5a, 5b, a locking element 7, for example, a locking strip 9, protrudes from the side edge 5a, 5b, which engages behind the bearing shell 16 and thus locks it to the rolling element cage.

[0031] For this purpose, the bearing shell 16 has recessed grooves 20 along the edge surfaces as corresponding locking means, into which the locking strip 9 engages.

[0032] At least one guide wing 21 protrudes in the axial direction (relative to the pivot axis A) from the outer surface 22 of each of the side rims 5a, 5b. This guide wing 21 is characterized by only one stop surface 10 in its axial extension. A corresponding return element 34 of the brake or pivot lever 30 can be applied here. The edge opposite the stop surface 10 is designed as an arcuate wing reinforcement 11 and, due to its arcuate shape, does not allow for a precisely positioned and repeatable stop of the aforementioned return element 34. The stop surface 10, however, allows the rolling element cage to be guided in one pivoting direction, while guidance in the opposite direction can be achieved by another stop, e.g., against the end surface 12 or the like. One advantage is the significantly lower risk of mechanical deformation of the guide wing due to the reduced mechanical load and the wing reinforcement 11.

[0033] The bearing shell 16 can be manufactured from a flat metal sheet bent into a cylindrical section or a circular arc. Due to the choice of material, this is tribologically insensitive. It has two central recesses 17 on its sides, in particular waists, into which the locking strips 9 of the rolling element cage engage. The waists 17 extend such that the rolling element cage 2 is guided in the waists 17 of the bearing shell 16 with limited movement. Thus, the recesses 17, on the one hand, simply assume the function of movement-limiting stops and, on the other hand, securely guide the bearing shell 16 on the rolling element cage 2 and hold it in place in the installed position. The recessed grooves 20 extend in a circular arc at least as long as, or longer than, the waists 17.

[0034] Due to the waist, the bearing shell is divided into two curved end segments 25 and a likewise curved middle segment 26.

[0035] Fastening devices such as lugs 19, 24 and / or bores fix the rolling element cage 2 and / or the bearing shell 16 to the respective components which are to be mounted so as to be movable relative to one another, such as the brake calliper 51 and the pivot lever 30 of the disc brake.

[0036] The plastic rolling element cage 2 has a central recess 15 with several recess-like bearing pockets 4 for accommodating one, preferably two, of the rolling elements 18, each in the form of a bearing needle. The bearing shell 16, on the other hand, consists of a metal sheet, which, with the exception of the lugs 19, 24, can be easily manufactured in a single bending process, so that the pivot bearing according to the invention can be manufactured significantly more cost-effectively than comparable pivot bearings without any functional impairment.

[0037] Fig. 6a, Fig. 6b and Fig. 7 shows a pivot lever 30 designed for arranging two pivot bearings as described above. Therefore, the pivot lever has a lever element 31 with a dome-shaped receptacle 37 at its end for receiving a plunger (not shown), e.g., a pneumatic cylinder. Furthermore, the pivot lever 30 has two wing-shaped bearing jaws, each with a bearing surface 32 for supporting one of the pivot bearings 1.

[0038] The pivot lever 30 defines a rotation axis 36, which is formed by an inner bearing surface 35 for pivotable mounting on a steering knuckle inside a brake caliper 51 and which is coaxial with the pivot axis A of the pivot bearing 1.

[0039] Adjacent to the bearing surface 32, the pivot lever has a track 33 along which the guide wing 21 runs. Adjacent to this track 33 is a guide surface 38, which is arranged laterally on a guide horn 39 and which extends parallel only over a partial area of ​​the arcuate shape of the bearing surface 32, preferably between 20-70% of the arcuate shape.

[0040] The guide surface terminates at a return element 34 as a corresponding stop to the guide wing 21. The pivot lever 30 also has other functional elements, which, however, are not of primary importance in the context of the bearing and arrangement of the pivot bearing.

[0041] In order to provide the said guide surfaces 38, a material-removing machining of a provided pivot lever, e.g. as a forged part or as a cast part or the like, can be carried out, so that the pivot lever in the embodiment according to Fig. 6a, Fig. 6b and Fig. 7 is provided.

[0042] The formation of the guide surfaces 38 of the guide horns 39 can be carried out, for example, by a grinding or milling process, in particular by circular milling.

[0043] This typically leaves a milling run-out, which must be removed by remachining. In this case, this milling run-out is the return element 34. Thus, the return element is a radial projection with a curved contour, which, due to its nature as a milling run-out, tapers progressively from its base to its upper edge. Surprisingly, it has also been shown that the guide vane 21 does not become stuck on this type of return element. Rather, the return element is additionally stabilized against deformation by the gradual tapering in the radial direction.

[0044] As already shown Fig. 1-7, the stop between the return element 34 and the guide wing 21 only occurs on one side.

[0045] Fig. 8a, Fig. 8b and Fig. 9 show this one-sided stop in detail. The illustrated pivot lever assembly 40 according to the invention, comprising the pivot lever 30 and the pivot bearing 1, is designed such that the pivot lever 30 can be pivotally positioned on a fixed counterbearing by the pivot bearing 1. The pivotability is limited by the locking mechanism between the locking means 7 and the corresponding recessed groove 20 and its length. Furthermore, an end stop is not always achieved, since the cage can lag behind the pivoting movement of the pivot lever.

[0046] The return element 34, in conjunction with the pivot lever 30, also serves as a vibration protection device and prevents the bearing from shifting.

[0047] Fig. 10 and Fig. Figure 11 then discloses an application device 50 of a disc brake according to the invention. The application device comprises a brake caliper 51 and the previously described pivot lever assembly 40, consisting of a pivot lever 30 and a pivot bearing 1, inserted therein.

[0048] One or more steering knuckles (not shown in the figures) are arranged in the brake caliper 51. Furthermore, a recess 52 for accommodating the guide horns 39 during the pivoting movement is arranged in the brake caliper 51. The recess 52 has guide surfaces on its edges that correspond to the guide surfaces 38 and thus secure the pivot lever 30 in its position during the movement.

[0049] In the following, some special features of the present invention are described in detail.

[0050] The guide wing 21 thus functionally has a return stop, which is not designed as a groove, but as a stop surface 10.

[0051] This is a stop surface 10 formed only on one side on the guide wing 21, preferably with a longitudinal extension parallel to the pivot axis 36 of the pivot bearing 1.

[0052] The counter-stop on the pivot lever 30, corresponding to the stop surface 10, forms the return element 34, which enables the return to stop only on one side. This return element 34 can be implemented with minimal effort by the end of a milled recess, in particular by circular milling. However, it would also be conceivable to form it without machining by milling or by attaching an additional component to the pivot lever.

[0053] The above-described return element is particularly preferably integrated directly in the pivot lever, through the combination of lateral lever guidance by means of guide surfaces to the brake calliper and use of the runout of the guide surfaces for the return of the pivot bearing cage.

[0054] Therefore, no additional component is required on the lever for cage return.

[0055] Conversely, the return can be integrated directly into the cage via the guide wing.

[0056] Due to the stop being only on one side, the surface of the guide wing 21 opposite the stop surface 10 can be designed as a stiffening element tapering towards the rear, which enables additional stability of the return movement as a whole.

[0057] Furthermore, the retaining webs 3 of the pivot bearing are only attached on one side, which means a structural simplification as well as a simplification in the manufacture of the pivot bearing, especially in a plastic injection process.

[0058] The locking strips 9 for ensuring the connection of the rolling element cage 2 with the rolling elements 18 and the bearing shell 16 are preferably designed as a spring undercut, i.e. as spring snap lugs.

[0059] The pivot lever 30 is provided on both sides with one of the previously described rolling element bearings. Fig. 10 and Fig. 11 each side has only one lateral support of the bearing shell 16 in the brake calliper 51, wherein the arrangement of the support points is arranged diagonally to each other. List of reference symbols 1 swivel bearing 2 rolling element cage 3 Holding bridge 4 storage bags 5a Side boards 5b Side boards 6a Guidance devices 6b Guidance devices 7 locking element 9 locking bar 10 Stop surface 11 Wing stiffening 12 End face 13 End face 15 recess 16 bearing shell 17 recesses 18 rolling elements 19 Nose 20 recessed grooves 21 guide wings 22 exterior surface 24 Nose 25 End segment 26 Middle segment 30 swivel levers 31 Lever element 32 storage areas 33 Career 34 Return element 35 indoor storage space 36 axis of rotation 37 recording 38 guide surface 39 Guide horn 40 Swing lever arrangement 50 clamping device 51 brake caliper 52 Deepening A swivel axis QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2004 031 792 A1

[0002] EP 3 129 668 B1

[0002] EP 3 112 718 A1

[0002] DE 10 2020 101 014 B3

[0003] DE 4204307 A

[0027] DE 197 31 696 A

[0027]

Claims

[1] Pivot bearing (1) for supporting a pivot lever (30) of an application device (50) of a disc brake, wherein the pivot bearing (1) has an arcuate bearing shell (16) and a roller bearing cage (2) pivotably guided thereon, characterized by that the rolling bearing cage (2) has at least one guide wing (21) projecting axially to the pivot axis (A), which has an axially extending stop surface (10) on only one side for returning the rolling element cage (2). [2] Pivot bearing according to claim 1, characterized by that the stop surface (10) is designed as an edge of the guide wing (21). [3] Pivot bearing according to claim 1 or 2, characterized by that the edge of the guide wing (21) opposite the stop surface (10) is designed as a wing stiffener (11) with an arcuate longitudinal profile. [4] Pivot bearing according to one of the preceding claims, characterized bythat the bearing shell (16) is designed as a sheet metal strip, wherein the bearing shell (16) runs in an arc plane over a continuous area of ​​more than 80% of its longitudinal extension. [5] Pivot bearing according to one of the preceding claims, characterized by that the bearing shell (16) is locked to the rolling element cage (2). [6] Pivot bearing according to one of the preceding claims, characterized by that the rolling element cage (2) has one or more locking elements (7), in particular one or more resilient locking strips (9), which are locked to a corresponding locking element of the bearing shell (16), in particular one or more recessed grooves (20). [7] Pivot bearing according to one of the preceding claims, characterized by that the guide wing (21) is formed integrally with the rolling element cage (2). [8] Pivot bearing according to one of the preceding claims, characterized byin that the rolling element cage (2) has bearing pockets (4) for supporting rolling elements (18), in particular bearing needles, wherein the bearing pockets (4) have holding webs (3) for holding the rolling elements (18), which are arranged on only one side of a bearing pocket (4). [9] Pivoting lever arrangement (40) comprising a pivoting lever (30) and a pivot bearing (1), preferably a pivot bearing (1) according to one of the preceding claims, wherein the pivot bearing (1) has an arcuate bearing shell (16) and a rolling bearing cage (2) pivotably guided thereon, characterized by in that the rolling bearing cage (2) has a guide wing (21) projecting axially to the pivot axis (A), with a stop surface (10) which, together with a corresponding return element (34) formed on the pivot lever (30), has a stop on only one side for returning the rolling bearing cage (2). [10] Pivoting lever arrangement according to claim 9, characterized bythat the return element (34) is designed as an increasingly tapered radial projection. [11] Pivoting lever arrangement according to claim 10, characterized by that the return element (34) has a contour which tapers towards the tapered portion. [12] Pivoting lever arrangement according to one of the preceding claims, characterized by that the return element (34) is arranged at the end of a guide surface (38) for guiding the pivoting lever (30) within a brake calliper (51) and is preferably formed integrally, in particular monolithically, with the rest of the pivoting lever (30). [13] Pivoting lever arrangement according to one of the preceding claims, characterized by that the return element (34) is designed as a milling outlet. [14] Application device (50) of a disc brake comprising a brake calliper (51) and a pivot lever arrangement (40) according to one of the preceding claims, which is supported in a contour in the brake calliper (51). [15] Clamping device according to claim 14, characterized by that the guide surface (38) is part of a guide horn (39) or is arranged adjacent to it, which dips into a recess (52) within the brake calliper (51) when the pivoting movement is carried out. [16] Clamping device according to claim 14 or 15, characterized by that each side of the pivot lever (30) has only one lateral support of the bearing shell (1) in the brake calliper (51), the arrangement of the support points being arranged diagonally to one another.

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