Pivot bearing, pivot lever device and clamping device

Abstract

The invention relates to a pivot bearing (1) for supporting a pivot lever (30) of a clamping device (50) of a disc brake, the pivot bearing (1) having an arcuate bearing housing (16) and a rolling bearing cage (2) which is pivotably guided on the bearing housing, the rolling bearing cage (2) having at least one guide vane (21) which projects axially with respect to a pivot axis (A), the guide fin is provided with a stop surface (10) which extends along the axial direction only on one side and is used for returning the rolling body cage (2); the invention further relates to a pivoting rod device and a clamping device.

Description

Technical Field

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

[0002] In the prior art, a pivot bearing is known, for example, from DE 10 2004 031 792 A1 or from EP 3 129 668 B1 and a corresponding pivot lever arrangement is known from EP 3 112 718 A1.

[0003] DE 10 2020 101 014 B3 also discloses a pivot bearing device with a return mechanism and a return fit mechanism, which are connected to each other via a wing section and a groove section, wherein the wing section is located in the groove. However, such a groove section must be installed on the pivot lever in a complex manner. Summary of the invention

[0004] Starting from this, the object of the present invention is to realize a return movement which is simpler and thus also easier to produce.

[0005] The present invention solves this problem through the technical solution of claim 1.

[0006] According to the invention, a pivot bearing is provided for supporting a pivot lever of a clamping device of a disk brake, wherein the pivot bearing has an arc-shaped bearing shell and a rolling bearing cage which is pivotably guided on the pivot shell.

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

[0008] In contrast to the above-mentioned prior art, the one-sided return is based on the recognition that a two-sided return is not absolutely necessary, in particular the pivot bearing additionally has a stop which prevents excessive pivoting of the bearing.

[0009] Advantageously, the stop surface is formed as an edge of the guide vane. This ensures that the stop of the guide vane is permanently stable.

[0010] It is also advantageous that the edge of the guide wing opposite to the stop surface is configured as a wing reinforcement having an arcuate longitudinal extension. This additionally resists deformation of the guide wing. At the same time, the guide wing can also be determined to be smaller in size.

[0011] The bearing shell can advantageously be designed as a metal strip, wherein the bearing shell extends in an arcuate surface over a continuous region of more than 80% of its longitudinal extension. This creates a particularly flat pivot bearing that requires little installation space.

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

[0013] Preferably, the rolling element cage has one or more latching elements, in particular one or more elastic latching strips, which latch with corresponding latching elements, in particular one or more recessed grooves, of the bearing shell. The latching can be advantageously performed for force distribution on both longitudinal sides of the bearing shell.

[0014] The guide vane can advantageously be formed integrally with the rolling element holder, so that it has a particular strength.

[0015] The rolling element cage has a bearing pocket for supporting rolling elements, in particular bearing needles, which has a retaining strip for retaining rolling elements, which are arranged on the bearing pocket only on one side. This enables the rolling elements to be easily inserted into the needle bearing from the rear side.

[0016] Furthermore, according to the invention, a pivot lever arrangement is provided, comprising a pivot lever and a pivot bearing, preferably a pivot bearing according to the invention, wherein the pivot bearing has an arc-shaped bearing shell and a rolling bearing cage pivotably guided thereon.

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

[0018] The knowledge that a one-sided stop is sufficient for returning the position makes it possible to achieve a significant simplification of the design of the pivot lever arrangement compared to the prior art.

[0019] In order to improve the inherent stability against deformation, it is advantageous if the restoring element is designed as an increasingly tapering radial projection.

[0020] Particularly preferably, the restoring element is a contour that curves away toward the taper and allows the guide vane to be guided along the restoring element as far as the stop end position. Surprisingly, the guide vane does not run over or get caught on the restoring element.

[0021] The restoring element can advantageously be arranged at the end of a guide surface for guiding the pivot lever within the brake caliper and can preferably be designed in one piece, in particular in one piece, with the rest of the pivot lever.

[0022] If the restoring element is designed as a milled outlet, a particular advantage is obtained in terms of the manufacturing process. The milled outlet is easy to identify for a technician. It is located at the end of the machined surface. Based on the corresponding surface contour formed here, further processing can be easily identified.

[0023] The clamping device for a disc brake comprises a brake caliper and a pivot lever arrangement according to one of the preceding claims, which is supported in a contour in the brake caliper.

[0024] As part of the pivot lever, the aforementioned guide surface can advantageously be part of a guide angle or be arranged adjacent to the guide angle, which extends into a recess within the brake caliper when the pivoting movement is performed. The guide surface thus assumes a guiding role within the recess.

[0025] Each side of the pivot lever can advantageously have only one-sided support of the bearing shell in the brake caliper, the support points being arranged diagonally to one another. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The pivot bearing according to the present invention, the pivot lever device according to the present invention and the clamping device according to the present invention will be described in detail below with the aid of the accompanying drawings.

[0027] Figure 1 A rear view of the pivot bearing according to the invention is shown in the above figure;

[0028] Figure 2 showing a side view of the pivot bearing;

[0029] Figure 3 showing a first perspective view of a pivot bearing;

[0030] Figure 4 showing a second perspective view of the pivot bearing;

[0031] Figure 5 A perspective view showing a rolling element cage of the pivot bearing of the upper figure;

[0032] FIG6 a shows a top view of a pivot rod for receiving a pivot bearing;

[0033] FIG6 b shows a side cross-sectional view of the pivot lever of FIG6 a ;

[0034] Figure 7 A perspective view showing the pivot lever of FIGS. 6a and 6b ;

[0035] FIG8 a shows a top view of a pivot lever arrangement according to the present invention;

[0036] FIG8b shows a side cross-sectional view of the pivot lever arrangement of FIG8a;

[0037] Fig. 9A perspective view showing the pivot lever arrangement of FIGS. 8a and 8b ;

[0038] Fig.10 A cross-sectional view showing a clamping device according to the present invention; and

[0039] Fig.11 Show Fig.10 sectional view of the vehicle body with the pivot rod removed. DETAILED DESCRIPTION

[0040] Figure 1-5 A pivot bearing 1 designed as a needle bearing for a disk brake is shown in detail, which can be used in particular to support the above-mentioned pivot lever (which is also synonymously called a rotation lever or brake lever), such as is known, for example, under the product designation SN6 or SN7 or in a similar design, for example from DE 4204307 A (see roller bearing 3 therein) or DE 197 31 696 A. For the design of such a disk brake that is not explained in detail here, please refer to these documents in their entirety. The pivot bearing 1 has a pivot axis A.

[0041] exist Figure 1-5 The pivot bearing 1 shown in the figure, which is constructed as a needle bearing or a roller bearing, has an arc-shaped bearing shell 16 and a rolling element retainer 2 that can pivot relative to the bearing shell, and a group of rolling elements 18, here in the form of bearing needles, is arranged between the bearing shell and the rolling element retainer, so that the bearing shell 16 can be movably supported by rolling elements, especially rollers, relative to the rolling element retainer 2.

[0042] The rolling element cage 2 can preferably be made of plastic and is provided with two side edges 5a, 5b perpendicular to the side faces of the rolling element cage directed outwards, which have guide surfaces pointing towards the bearing needles 18. The opposite side edges 5a, 5b together with two opposite end edges, which each have the end faces 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 delimited on one side by retaining strips 3 extending parallel to the pivot axis A between the side edges 5a, 5b. The retaining strips 3 prevent the rolling elements 18 (such as bearing needles) from falling out in the radial direction from the inside when the pivot bearing 1 is installed. On the rear side, the bearing shell 16 prevents falling out.

[0043] Extending parallel to the side edges 5a, 5b are guide means 6a and 6b, for example as arc-shaped projections. The guide means 6a and 6b extend in the direction of the bearing shell 16 and laterally surround it in a U-shaped manner. In addition to the guide means 6a and 6b extending from the side edges 5a, 5b, latching elements 7, for example latching strips 9, extend from the side edges 5a, 5b, which latching elements engage the bearing shell 16 from behind and thus latch with the rolling element cage.

[0044] For this purpose, the bearing shell 16 has, along the edge surface, a recessed groove 20 , into which the latching strip 9 engages as a corresponding latching means.

[0045] At least one guide wing 21 extends in the axial direction (with respect to the pivot axis A) from the outer surface 22 of the side edges 5a, 5b. The guide wing 21 is characterized by having only one stop surface 10 in the axial extension. A corresponding restoring element 34 of the brake lever or pivot lever 30 can act here. The edge opposite the stop surface 10 is designed as an arc-shaped wing reinforcement 11 and due to the arc shape, a positionally accurate and repeatable stop of the above-mentioned restoring element 34 cannot be achieved. The stop surface 10 allows the rolling element cage to be guided in one pivoting direction, while the guidance in the opposite direction can be achieved by another stop, for example against the end face 12 or the like. The advantage is that due to the reduced mechanical load and due to the wing reinforcement 11, the risk of mechanical deformation of the guide wing is significantly lower.

[0046] The bearing shell 16 can be made of a flat sheet metal that is bent into a cylindrical section or into the shape of a circular arc. Due to the material selection, it is insensitive to friction. It has two central recesses 17 on its side, in particular waists, into which the locking strips 9 of the rolling element cage engage, and the waists 17 have such an extension that the rolling element cage 2 is guided in a limited movable manner in the waists 17 of the bearing shell 16, so that the recesses 17 on the one hand assume the function of a stop that limits the movement in a simple manner and on the other hand guide the bearing shell 16 well on the rolling element cage 2 and hold it in the installed state. The recessed groove 20 here has an arc-shaped extension that is at least as long as the waist 17 or longer.

[0047] Due to the waisting, the bearing shell is divided into two arcuate end sections 25 and a likewise arcuate middle section 26 .

[0048] Fastening means, such as projections 19 , 24 and / or holes, fix rolling element cage 2 and / or bearing shell 16 to respectively associated components of the disk brake, such as brake caliper 51 and pivot lever 30 , which are to be mounted movably relative to one another.

[0049] The plastic rolling element cage 2 has a central recess 15 with a plurality of recess-shaped bearing pockets 4 for receiving one, preferably two, rolling elements 18, each in the form of a bearing pin. The bearing shell 16, however, is made of sheet metal which, apart from the projections 19, 24, can be produced in a simple manner in only one bending process, so that the pivot bearing according to the invention can be produced significantly more cost-effectively than a comparable pivot bearing without any impairment of functionality.

[0050] 6a, 6b and 7 show a pivot lever 30 which is designed for arranging two of the above-mentioned pivot bearings. The pivot lever thus has a lever element 31 and a spherical segment-shaped receiving portion 37 at the end for receiving a push rod (not shown), for example, of a pneumatic cylinder. Furthermore, the pivot lever 30 has two wing-shaped bearing jaws, each bearing jaw having a bearing surface 32 for supporting one of the pivot bearings 1.

[0051] The pivot lever 30 defines a rotation axis 36 which is defined by an inner bearing surface 35 for pivotable mounting on a steering knuckle within the brake caliper 51 and which is coaxial with the pivot axis A of the pivot bearing 1 .

[0052] Adjacent to the bearing surface 32, the pivot lever has a slideway 33 along which the guide wing 21 runs. Adjacent to the slideway 33 is a guide surface 38, which is arranged laterally at a guide angle 39 and which extends parallel to only a portion of the arcuate shape of the bearing surface 32, preferably between 20-70% of the arcuate shape.

[0053] The guide surface ends at a restoring element 34 which serves as a counter-stop to the guide vane 21. The pivot lever 30 also has further functional elements which, however, are not essential with regard to the support and arrangement of the pivot bearing.

[0054] In order to provide the guide surface 38, the pivot lever can be provided by material removal, for example as a forged part or a cast part or the like, so that it can be formed according to FIGS. 6a, 6b and 6c. Figure 7 The construction provides a pivot rod.

[0055] The guide surface 38 of the guide angle 39 can be formed, for example, by a grinding or milling process, in particular circular milling.

[0056] Typically, a milled outlet remains here, which must be removed by remachining. In the present case, this milled outlet is the restoring element 34. The restoring element is therefore a radial projection with a curved profile, which, due to its form as a milled outlet, tapers increasingly from the very beginning to its upper edge. Furthermore, as has surprisingly been shown, the guide vane 21 does not get stuck on a restoring element of this type. On the contrary, the restoring element is additionally stabilized against deformation by the gradual tapering in the radial direction.

[0057] If already from Figure 1-7 As can be seen in FIG. 2 , the stop between the restoring element 34 and the guide vane 21 is only provided on one side.

[0058] 8a, 8b and 9 show such a one-sided stop in detail. The pivot lever arrangement 40 according to the invention shown, comprising a pivot lever 30 and a pivot bearing 1, is designed such that the pivot lever 30 can be pivotally positioned on a fixed mating bearing via the pivot bearing 1. The pivotability is limited by the latching between the latching means 7 and the corresponding recessed groove 20 and their length. Furthermore, an end stop is not always achieved, since the cage can lag behind the pivoting movement of the pivot lever.

[0059] In cooperation with the pivot lever 30 , the restoring element 34 also serves in particular as an anti-vibration device and prevents a displacement of the bearing.

[0060] Then Fig.10 and Fig.11 A clamping device 50 for a disc brake according to the present invention is disclosed. The clamping device comprises a brake caliper 51 and the above-mentioned pivot lever device 40 comprising the pivot lever 30 and the pivot bearing 1 installed therein.

[0061] One or more steering knuckles, which are hidden in the figure, are arranged in the brake caliper 51. In addition, a recess 52 for accommodating the guide angle 39 during the pivoting movement is provided in the brake caliper 51. The recess 52 has an edge-side guide surface which corresponds to the guide surface 38 and thus secures the pivot lever 30 in its position during the movement.

[0062] Some features of the present invention will be described again in detail below.

[0063] The guide vane 21 therefore functionally has a return stop which is not embodied as a recess but is formed as a stop surface 10 .

[0064] This is a stop surface which is formed only on one side of the guide vane 21 and which preferably has a longitudinal extension parallel to the pivot axis 36 of the pivot bearing 1 .

[0065] The counter-stop on the pivot lever 30 corresponding to the stop surface 10 forms a restoring element 34, which enables a stop only on one side of the restoring element. The restoring element 34 can be implemented with minimal effort by finishing with free milling, in particular by machining by circular milling. However, it is also conceivable to form it in one piece without machining by milling or by attaching an additional component to the pivot lever.

[0066] The above-mentioned restoring element is particularly preferably integrated directly in the pivot lever by a combination of guidance relative to the lateral lever of the brake caliper by means of a guide surface and termination with the guide surface for restoring the pivot bearing cage.

[0067] Therefore, no additional components are required on the rod for returning the cage.

[0068] Instead, the return can be integrated directly into the cage via the guide tabs.

[0069] By virtue of the stop only on one side, the surface of the guide vane 21 opposite the stop surface 10 can be designed as a reinforcement that tapers toward the rear, which overall enables additional stability of the return position.

[0070] Furthermore, the retaining strip 3 of the pivot bearing is arranged only on one side, which means a simplified design of the pivot bearing and a simplified production, in particular during plastic injection molding.

[0071] The latching strips 9 for securing the connection of the rolling element cage 2 to the rolling elements 18 and the bearing shell 16 are preferably designed as elastic undercuts, ie, elastic snap-in projections.

[0072] The pivot lever 30 is formed with one of the above-mentioned rolling element bearings on both sides. Fig.10 and Fig.11 , each side has only one-sided support of the bearing shell 16 in the brake caliper 51 , the support points being arranged diagonally to one another.

[0073] Reference numerals list

[0074] 1 Pivot bearing

[0075] 2 Rolling element cage

[0076] 3. Keep the slats

[0077] 4 bearing bags

[0078] 5a Side edge

[0079] 5b Side edge

[0080] 6a Boot Device

[0081] 6b boot device

[0082] 7 Locking element

[0083] 9-card lock strip

[0084] 10 Stop surface

[0085] 11 Wing reinforcement

[0086] 12 End face

[0087] 13 End face

[0088] 15 recesses

[0089] 16 Bearing shell

[0090] 17 recesses

[0091] 18 rolling elements

[0092] 19 protrusion

[0093] 20 recessed grooves

[0094] 21 Guide fins

[0095] 22 External surface

[0096] 24 protrusions

[0097] 25 end section

[0098] 26 Middle section

[0099] 30 Pivot rod

[0100] 31 rod elements

[0101] 32 bearing surface

[0102] 33 slides

[0103] 34 return element

[0104] 35 inner bearing surface

[0105] 36 Pivot axis

[0106] 37 Reception Department

[0107] 38 Guide surface

[0108] 39 Guide Angle

[0109] 40 Pivot rod device

[0110] 50 Clamping device

[0111] 51 brake caliper

[0112] 52 Depression

[0113] A Pivot Axis

Claims

1. A pivot bearing (1) for supporting a pivot lever (30) of a clamping device (50) of a disc brake, wherein: The pivot bearing (1) comprises an arc-shaped bearing shell (16) and a rolling bearing cage (2) pivotably guided on the bearing shell, characterized in that the rolling bearing cage (2) comprises at least one guide wing (21) extending axially relative to the pivot axis (A), the guide wing having an axially extending stop surface (10) on only one side for returning the rolling element cage (2).

2. The pivot bearing according to claim 1, characterized in that The stop surface (10) is designed as the edge of a guide vane (21).

3. The pivot bearing according to claim 1 or 2, characterized in that: The edge of the guide vane (21) opposite to the stop surface (10) is configured as a vane reinforcement portion (11) having an arc-shaped longitudinal extension.

4. Pivot bearing according to one of the preceding claims, characterized in that The bearing shell (16) is designed as a metal strip, wherein the bearing shell (16) extends in an arc-shaped plane over a continuous region of more than 80% of its longitudinal extension.

5. Pivot bearing according to one of the preceding claims, characterized in that The bearing shell (16) is locked with the rolling element retainer (2).

6. Pivot bearing according to one of the preceding claims, characterized in that The rolling element cage (2) has one or more locking elements (7), in particular one or more elastic locking strips (9), which are locked with corresponding locking elements, in particular one or more recessed grooves (20), of the bearing shell (16).

7. Pivot bearing according to one of the preceding claims, characterized in that The guide vanes (21) are formed integrally with the rolling element cage (2).

8. Pivot bearing according to one of the preceding claims, characterized in that The rolling element cage (2) has a bearing pocket (4) for supporting rolling elements (18), in particular bearing needles, the bearing pocket (4) having a retaining strip (3) for retaining the rolling elements (18), which retaining strip is arranged on the bearing pocket (4) only on one side.

9. A pivot lever arrangement (40) comprising a pivot lever (30) and a pivot bearing (1), preferably a pivot bearing (1) according to one of the preceding claims, wherein: The pivot bearing (1) comprises an arc-shaped bearing shell (16) and a rolling bearing cage (2) which is pivotably guided on the bearing shell, characterized in that the rolling bearing cage (2) has a guide wing (21) which protrudes axially relative to the pivot axis (A), and has 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 element cage (2).

10. The pivot lever device according to claim 9, characterized in that The restoring element (34) is designed as a radial projection which tapers increasingly.

11. The pivot lever device according to claim 10, characterized in that The restoring element (34) has a profile that bends toward a tapered portion.

12. Pivot lever arrangement according to one of the preceding claims, characterized in that The restoring element (34) is arranged at the end of a guide surface (38) for guiding the pivot lever (30) within the brake caliper (51) and is preferably designed in one piece, in particular in one piece, with the rest of the pivot lever (30).

13. Pivot lever arrangement according to one of the preceding claims, characterized in that The restoring element (34) is designed as a milled outlet.

14. Clamping device (50) for a disc brake, comprising a brake caliper (51) and a pivot lever arrangement (40) according to one of the preceding claims, which is supported in a contour in the brake caliper (51).

15. The clamping device according to claim 14, characterized in that The guide surface (38) is part of a guide angle (39) or is arranged adjacent to the guide angle, which projects into a recess (52) within the brake caliper (51) during a pivoting movement.

16. The clamping device according to claim 14 or 15, characterized in that Each side of the pivot lever (30) has a support of the bearing shell (1) in the brake caliper (51) on only one side, the support points being arranged diagonally to one another.

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