Measure to extend the service life of a sliding roller in an electromechanical brake

Abstract

The invention relates to a brake, in particular an electromechanical disc brake for a commercial vehicle, comprising: a brake caliper with a caliper support, a pressure piece movably mounted in the brake caliper, a lever pivotably mounted in the brake caliper about an axis of rotation, which is configured to transmit a braking force from a brake cylinder to the pressure piece, a rolling element which guides the lever along the axis of rotation and pivotably supports it, and a support element for supporting the rolling element against the caliper support of the brake caliper.The invention solves the underlying problem in a brake of the aforementioned type by providing the support element with a central section and two end sections adjacent to the central section, opposite each other at the ends, wherein the support element and / or the caliper support are shaped such that a clearance is formed between the end sections and the caliper support, at least in an unloaded state of the brake. The invention solves the underlying problem in a second aspect by means of a brake caliper and in a third aspect by means of a support element for such a brake.

Description

[0001] The present invention relates to a brake, in particular an electromechanical disc brake for a commercial vehicle, comprising: a brake caliper with a caliper support, a pressure piece movably mounted in the brake caliper, a lever pivotably mounted in the brake caliper about an axis of rotation, which is configured to transmit a braking force from a brake cylinder to the pressure piece, a rolling element which guides the lever along the axis of rotation and pivotably supports it, and a support element for supporting the rolling element against the caliper support of the brake caliper.

[0002] The invention relates in particular to electromechanical disc brakes that operate according to the single-piston principle, i.e., that have only one pressure piston for moving the brake shoes. The technical advantages of the so-called single-piston actuation are generally considered to be its weight-saving design and compact form.

[0003] In brakes of the type mentioned above, a braking force is transmitted from a brake cylinder to a pressure piece movably mounted in the brake caliper via a lever. The lever is typically guided along its axis of rotation by a rolling element and pivotally supported against the brake caliper. When the brake is under load, with a braking force acting on the lever from the brake cylinder, the brake caliper deforms. This deformation subjects the end regions of the rolling element opposite the axis of rotation to considerable stress. This inhomogeneous force application to the rolling element leads to increased wear. (See page 2 and page 2a (final version))

[0004] of the edge areas, resulting in a reduced service life. Furthermore, the considerable stress on the edge areas of the rolling element leads to a significant increase in pressure, thus causing work hardening and an increase in the stiffness of these edge areas. Due to the increased stiffness of the rolling element, the brake caliper experiences a considerable stress concentration when force is applied through these edge areas.

[0005] Brakes are known in which the pressure on the outer areas of the rolling element is counteracted by a convex shape of the rolling element. DE 10 2015 100 322 A1, for example, discloses such a brake. The manufacturing costs of a convex rolling element are significantly higher compared to cylindrical or semi-cylindrical rolling elements.

[0006] To ensure a more homogeneous force transmission in the brake caliper and thus avoid stress concentrations, a rolling element with a partially cylindrical shape was previously chosen, which comprised a substantially flat contact surface corresponding to the caliper mounting surface of the brake caliper. Such a brake is disclosed, for example, in US 7,506,732 B2.

[0007] Furthermore, DE 296 23 621 U1 discloses a brake with a pivot and lever mechanism which has a rolling element as a support element for guiding and supporting forces against a brake housing.

[0008] German patent DE 60 2004 007 576 T2 describes a lever assembly that can be equipped with a rolling bearing, the lever of which is inserted through an opening in the brake caliper and clipped into place. A snap ring ensures locking, and a longitudinal groove-key combination prevents incorrect alignment.

[0009] DE 44 30 258 C1 discloses a brake with a compact clamping device in which the clamping shaft is decoupled via two differently positioned axes and a rolling element, such that the pressure piece is only displaced axially without oscillating laterally. This results in precise, low-wear and consistently effective brake actuation.

[0010] While this design method has proven itself in principle, there is still a need for further improvements.

[0011] In particular, there is a need to further increase the service life of the brake, to enable a more homogeneous force transmission into the brake caliper, and to avoid stress concentrations.

[0012] Furthermore, there is a need to reduce manufacturing costs without compromising the lifespan of the brake.

[0013] Accordingly, the invention was based on the objective of providing an improved brake. In particular, the invention was based on the objective of providing a brake with an increased service life while maintaining or reducing manufacturing costs.

[0014] The invention solves the underlying problem in a brake of the type described above by having a central section and two end sections adjacent to the central section and opposite each other, wherein the support element and / or the saddle support are shaped such that a free space is formed between the end sections and the saddle support, at least in an unloaded state of the brake.

[0015] An unloaded state of the brake is understood here to be a state in which no force acts through the brake cylinder on the lever or any other part of the brake.

[0016] Preferably, the central section of the support element is in contact with the corresponding saddle surface of the brake caliper, ensuring that the rolling element is reliably compressed, particularly along the axis of rotation of the lever. The resulting clearance prevents pressure on the edge regions of the rolling element when a braking force transmitted by the lever to the pressure piece and the brake caliper is applied.

[0017] The force exerted on the end sections of the support element by the rolling element initially leads to a deformation of the support element before the edge regions of the rolling element are compressed. This significantly reduces the stress on these areas of the rolling element, thereby increasing the service life of the brake and, in particular, the rolling element.

[0018] Furthermore, the deformation or bending of the end sections into the free space prevents an increase in the stiffness of the edge areas, resulting in a more homogeneous force transmission into the brake caliper and avoiding stress peaks.

[0019] The end sections of the support element can thus be at least partially displaced into the free space as a result of increased stress on the edge regions of the rolling element. This displacement of the end sections prevents pressure on the edge regions of the rolling element and therefore does not increase the stiffness of these areas.

[0020] For the purposes of the invention, a free space is understood to be any kind of cavity, gap or recess which is at least partially or completely enclosed by the saddle support and the end sections.

[0021] According to the invention, the support element, as well as the rolling element, are preferably made of a solid material, particularly preferably of a metallic material. This ensures sufficient dimensional stability and durability.

[0022] According to a preferred embodiment of the invention, the end sections of the support element each have a recess for forming at least part of the clearance space with the saddle bearing. By means of recesses in the end sections of the support element, at least part, or optionally the entire clearance space, which is bounded by the saddle bearing, can be formed at low manufacturing costs. Such a recess can be provided, in particular, by forming the support element, for example by milling or other cutting processes.

[0023] Preferably, the caliper bearing surface has a recess in the area opposite the end sections of the support element to form at least part of the clearance space with the end sections of the support element. Thus, at least part of the clearance space is provided by appropriate shaping of the brake caliper or by creating a recess using a cutting process.

[0024] A recess for forming at least part of the free space, either the end sections of the support element or the saddle support, can optionally form the entire free space, provided that it is provided either only on the support element or only on the saddle support.

[0025] In the case where the end sections of the support element each have a recess and the saddle support also has a recess in the respective area opposite the end sections, then a recess of the respective end section together with a recess of the saddle support forms the entire free space.

[0026] According to a preferred embodiment of the invention, the clearance is essentially wedge-shaped. Essentially wedge-shaped is understood to mean that the wedge shape of the clearance can also be slightly curved around the axis of rotation, or that the surface of the saddle bearing and the end sections do not have completely flat surfaces between which the clearance is formed. Crucially, the clearance tapers at an acute angle to the central section of the support element in a cross-sectional plane perpendicular to the axis of rotation. This design increases the deflection path of the end sections at the ends due to the force applied in the direction of the axis of rotation, thus preventing compression of the rolling element's edge regions.

[0027] In the context of the invention, a cross-sectional plane perpendicular to the axis of rotation is understood to be any plane from a plurality of planes whose surface normal runs in the direction of the axis of rotation.

[0028] According to a preferred embodiment of the invention, the clearance in a cross-sectional plane parallel to the axis of rotation has an angle α greater than 0°, in particular greater than 0.5°, which is enclosed by the end sections and the saddle support. An angle greater than 0.5° ensures that the clearance is maintained even under load, so that the edge regions continue to be relieved of stress.

[0029] According to a preferred embodiment of the invention, the free space in a cross-sectional plane parallel to the axis of rotation has an angle α greater than 0°, in particular less than 0.5°, which is enclosed by the end sections and the saddle support. Such a sharply tapered angle only minimally weakens the load-bearing capacity of the support element or the saddle support, thus counteracting premature failure.

[0030] For the purposes of the invention, a cross-sectional plane parallel to the axis of rotation also includes a plane in which the axis of rotation itself lies.

[0031] Preferably, the length of the central section is at least 50%, and particularly at least 65%, of the length of the support element. This ensures sufficient support of the rolling element along the longitudinal axis of rotation and simultaneously provides clearance between the end sections of the support element and the saddle bearing. The invention utilizes the fact that the displacement path of the end sections through the clearance perpendicular to the axis of rotation is very small relative to the length of the support element, thus preventing compression of the edge regions.

[0032] According to an alternative preferred embodiment of the invention, the length of the central section is at most 20%, and in particular at most 10%, of the length of the support element. Furthermore, the central section gradually transitions into the end sections, and preferably the support element has a surface convexly curved along the axis of rotation opposite the surface of the caliper bearing. Thus, the contact area between the brake caliper and the support element, which in the unloaded state is determined by the very short central section, can gradually increase with increasing braking force, so that the support element and the rolling element are finally in complete contact and the rolling element is guided and pivotably supported along the longitudinal axis of the lever.

[0033] Preferably, the rolling element is at least partially cylindrical or cylindrical, and the support element has, at least partially, a negative curvature in a cross-sectional plane perpendicular to the axis of rotation, corresponding to the curvature of the rolling element. Preferably, the support element is negatively curved in such a way that it conforms to the rolling element, at least partially. Thus, the support element absorbs forces in two spatial directions transmitted by the rolling element. The curved design of the support element further increases the safety of the brake and counteracts slippage of the rolling element.

[0034] According to a further preferred embodiment of the invention, the support element is integrally formed on the brake caliper, and the clearance is formed in a recess of the brake caliper. Such a recess can be created, for example, by forming processes such as casting or by separation processes. Such a recess is understood to be any type of freeform shape formed between the end sections of the support element integrally formed on the brake caliper and the opposite part of the brake caliper or the caliper mounting surface. This reduces the number of components and simplifies the assembly of the brake.

[0035] According to an alternative preferred embodiment of the invention, the support element is designed as a separate part of the brake caliper and has a mounting interface for attachment to a corresponding mounting interface of the brake caliper. This simplifies the manufacturing process of the brake, and in particular the brake caliper, and thus reduces manufacturing costs. The attachment of the support element's mounting interface to the brake caliper's mounting interface can be achieved by positive locking, frictional locking, and / or material bonding. For the purposes of the invention, a positive locking attachment of the support element via its mounting interface to the brake caliper's mounting interface also includes placing the support element on a lower boundary surface of the brake caliper and bringing the central section of the support element into contact with the caliper's mounting surface.

[0036] The invention has been described above with regard to a first aspect.

[0037] The invention further relates in a second aspect to a brake caliper for a brake, in particular for an electromechanical disc brake for a commercial vehicle of the type described above, wherein the brake comprises: a pressure piece movably mounted in the brake caliper, a lever pivotably mounted in the brake caliper for transmitting a braking force from a brake cylinder to the pressure piece, a rolling element that guides the lever along the axis of rotation and pivotably supports it, and a support element, wherein the brake caliper comprises a caliper support and the support element is configured to to support the rolling element against the caliper mounting surface of the brake caliper. The invention solves the problem described above in a second aspect by providing the support element with a central section and two end sections adjacent to the central section and opposite each other, wherein the caliper mounting surface is shaped such that a clearance is formed between the end sections and the caliper mounting surface, at least in an unloaded state of the brake.

[0038] Preferably, the support element has a mounting interface and the brake caliper has a corresponding mounting interface for coupling with the mounting interface of the support element.

[0039] Preferably, the support element for supporting the rolling element is formed as an integral part of the brake caliper and the free space is formed in a molding of the brake caliper.

[0040] In a third aspect, the invention relates to a support element for a brake, in particular for a brake with a support element designed as a separate part, wherein the brake comprises: a brake caliper with a caliper support, a pressure piece movably mounted in the brake caliper, a lever pivotably mounted in the brake caliper for transmitting a braking force from a brake cylinder to the pressure piece, a rolling element which guides the lever along the axis of rotation and pivotably supports it, and a support element for supporting the rolling element against the caliper support of the brake caliper.The invention solves the problem described above in a third aspect by having the support element have a central section and two end sections adjacent to the central section and opposite each other, wherein the support element is shaped such that a free space is formed between the end sections and the saddle support, at least in an unloaded state of the brake.

[0041] The advantages of the brake described above apply equally to the support element and the brake caliper, and vice versa. Preferred embodiments of the brake according to the invention are simultaneously preferred embodiments of the support element and the brake caliper for such a brake.

[0042] Embodiments of the invention are now described below with reference to the drawings. These drawings are not necessarily intended to represent the embodiments to scale. Rather, where helpful for clarification, the drawings are presented in a schematic and / or slightly distorted form. With regard to additions to the teachings directly apparent from the drawings, reference is made to the relevant prior art. It should be noted that numerous modifications and changes concerning the form and detail of an embodiment can be made without departing from the general idea of ​​the invention. The general idea of ​​the invention is not limited to the exact form or detail of the preferred embodiments shown and described below, nor is it limited to an object that would be restricted compared to the object claimed in the claims.For specified design ranges, values ​​lying within the stated limits should also be disclosed as limit values ​​and be freely applicable and stress-resistant. For the sake of simplicity, the same reference numerals are used below for identical or similar parts or parts with identical or similar functions.

[0043] Further advantages, features, and details of the invention will become apparent from the following description of the preferred embodiments, as well as from the following figures. Specifically, the figures show: Fig. 1 a schematic sectional view of a brake according to a preferred embodiment, Fig. 2 a schematic sectional view of a brake according to a second preferred embodiment, Fig. 3 a schematic sectional view of a brake according to a third preferred embodiment, Fig. 4 a schematic sectional view of a brake according to a fourth preferred embodiment, Fig. 5 a schematic sectional view of a brake according to a fifth preferred embodiment, Fig. 6a an excerpt of a schematic sectional view of the brake according to Fig. 1 according to a first preferred development, Fig. 6b a schematic diagram of the in Fig. 6a shown excerpt, Fig. 7a a section of a schematic sectional view of the brake according to Fig. 1 according to a second further development, Fig. 7b a schematic diagram of the in Fig. 7a shown excerpt, Fig. 8a a section of a schematic sectional view of the brake according to Fig. 1 according to a third further development, Fig. 8b a schematic diagram of the in Fig. 8a shown excerpt, Fig. 9a an excerpt of a schematic sectional view of the brake according to Fig. 1 according to a fourth further development, and Fig. 9b a schematic diagram of the in Fig. 9a shown excerpt.

[0044] Fig. Figure 1 shows a brake 1 with a brake caliper 10 and a pressure piece 20 movably arranged in the brake caliper 10. The brake 1 further comprises a pair of brake shoes 30a, b, wherein brake shoe 30a is coupled to the pressure piece 20, and a pivotably mounted lever 40 which bears against the pressure piece 20. The brake also includes a rolling element 50 for guiding along a rotational axis 42 and pivotably supporting the lever 40, and a support element 60 for supporting the rolling element 50 against the brake caliper 10.

[0045] The brake caliper 10 comprises a caliper support 12, which is at least partially in contact with the support element 60 and has a mounting interface (not shown) for engaging with the support element 60.

[0046] Furthermore, the brake caliper 10 has a support section 16 which is designed to absorb horizontal and any vertical forces and to align the support element 60 on the brake caliper 10.

[0047] The pressure piece 20 and the brake shoe 30a coupled to it can be moved towards a brake disc (not shown) by means of the lever 40, which is pivotably mounted about the axis of rotation 42. The pressure piece 20 is guided in its movement towards the brake disc by a pressure piece guide 22, which includes two sliding surfaces 23a, 23b.

[0048] The pressure piece 20 and the brake shoe 30a are coupled to each other by means of a hinge 24. The pressure piece 20 also comprises at least one concave pressure surface 26, on which a pivot bearing 28 is mounted. The pivot bearing 28 is designed to pivotally support and guide the lever 40 against the pressure piece 20.

[0049] The lever 40 comprises a lever arm 44, which is operatively connected to a brake cylinder (not shown) such that a braking force applied by the brake cylinder causes the lever 40 to pivot about its axis of rotation 42. For this purpose, the lever 40 has a first convex bearing surface 46, which is in contact with the pivot bearing 28. Furthermore, the lever 40 has a second concave bearing surface 48, which is in contact with the rolling element 50 and is guided by it and pivotably supported along the axis of rotation 42.

[0050] The axis of the swivel bearing 28 is arranged radially offset from the axis of rotation 42.

[0051] The rolling element 50 is cylindrical and symmetrical about the axis of rotation 42. Preferably, the rolling element 50 is made of a solid or high-strength metallic material.

[0052] The support element 60 has a mounting interface (not shown) on the saddle side for attachment to the corresponding mounting interface (not shown) of the saddle support 12, wherein in the assembled state a mounting surface 68 of the support element 60 is at least partially in contact with the saddle support 12.

[0053] The support element 60 further comprises a support surface 63 on the rolling element side, which is in contact with the rolling element 50. The support surface 63 preferably extends, at least section by section, at an angle β > 0° relative to a mounting surface (not shown), so that it follows the curvature of the cylindrical rolling element 50 and can absorb forces in two spatial directions.

[0054] The following section explains the operation of brake 1 according to the first preferred embodiment by way of an example. This explanation applies equally to the second to fifth embodiments of the brake according to the invention.

[0055] A driver provides an actuation signal, for example by pressing a brake pedal, which causes the brake cylinder to apply a braking force to the lever 40, causing it to pivot about its axis of rotation 42. Due to the radial offset of the axis of the pivot bearing 28 relative to the axis of rotation 42, the pivoting movement of the lever 40 results in a linear movement of the pressure piece 20 towards the brake disc. The lever 40 is supported against the rolling element 50 with its second bearing surface 48 along the axis of rotation 42. The rolling element 50 is supported against the caliper bearing 12 of the brake caliper 10 by the support element 60 and, in particular, by the support surface 63 in the area of ​​the central section (not shown).

[0056] The end sections of the support element 60 are not in contact with the saddle support 12, so that the support element 60 and in particular the end sections of the support element 60 deform at least partially as a result of the forces acting on the support element 50 by the rolling element 50.

[0057] Fig. Figure 2 shows a second preferred embodiment of the brake 1' according to the invention, comprising a brake caliper 10' and a pressure piece 20 movably arranged in the brake caliper 10', which is coupled to a pair of brake shoes 30a, b. A lever 40 is pivotably mounted about an axis of rotation 42 in a known manner and is supported against the pressure piece 20. The brake further comprises a rolling element 50' for guiding along the axis of rotation 42 and pivotably supporting the lever 40, and a support element 60' for supporting the rolling element 50' against the brake caliper 10'.

[0058] The in Fig. The brake shown in section 2 differs from the one shown in the diagram. Fig. Brake 1 shown is essentially defined by the design of the rolling element 50' and the support element 60'.

[0059] The rolling element 50' has a substantially flat contact surface 52, which is in contact with the support element 60' and in particular the support surface 63.

[0060] The support element 60' runs partially cylindrically along the axis of rotation 42 and has a rectangular cross-section in a cross-sectional plane perpendicular to the axis of rotation 40.

[0061] The support element 60' has a central section (not shown) with a substantially planar support surface 63' to the saddle support 12 of the brake caliper 10'.

[0062] The support element 60' has a mounting interface (not shown) on the saddle side for attachment to the corresponding mounting interface (not shown) of the saddle support 12, wherein in the assembled state a mounting surface 68 of the support element 60' is at least partially in contact with the saddle support 12.

[0063] The support element 60' includes a middle section (see Fig. 6a, reference 62) and two to the middle section (see Fig. 6a, reference numeral 62) adjacent end sections opposite each other. A gap is formed between the end sections of the support element 60' and the saddle support 12.

[0064] Fig. Figure 3 shows a third preferred embodiment of the brake 1'' according to the invention, comprising a brake caliper 10' and a pressure piece 20 movably arranged in the brake caliper 10'', which is coupled to a pair of brake shoes 30a. A lever 40 is pivotably mounted about an axis of rotation 42 in a known manner and is supported against the pressure piece 20. The brake further comprises a rolling element 50 for guiding along the axis of rotation 42 and pivotably supporting the lever 40, and a support element 60' for supporting the rolling element 50 against the brake caliper 10''.

[0065] The brake 1'' according to Fig. 3 differs from those in the Fig. 1 and Fig. 2 brake 1, 1' shown by the fact that the support element 60'' is integrally formed on the brake caliper 10''.

[0066] The rolling element 50 is cylindrical around the axis of rotation 42.

[0067] The support element 60' includes a middle section (see Fig. 6a, reference numeral 62) and two end sections adjacent to the middle section and opposite each other (see Fig. 6a, reference numerals 64a, b). In the area of ​​the end sections of the support element 60'' a clearance is formed on the brake caliper 10''.

[0068] The support element 60'' has a support surface 63'' on the rolling element side, which is in contact with the cylindrical rolling element 50 in a known manner.

[0069] Fig. Figure 4 shows a fourth preferred embodiment of the brake 1''' according to the invention, comprising a brake caliper 10''' and a pressure piece 20 movably arranged in the brake caliper 10''', which is coupled to a pair of brake shoes 30a,b. A lever 40 is pivotably mounted about an axis of rotation 42 in a known manner and bears against the pressure piece 20. Furthermore, the brake 1''' comprises a rolling element 50' for guiding along the axis of rotation 42 and pivotably supporting the lever 40, and a support element 60''' for supporting the rolling element 50' against the brake caliper 10'''.

[0070] The in Fig. The embodiment of brake 1''' shown in Figure 4 differs from those shown in the Fig. 1 to 3 brake 1, 1', 1'' shown by the fact that the support element 60''' is integrally formed on the brake caliper 10''' and has a substantially flat support surface 63''' which is in contact with a contact surface 52 of the semi-cylindrical rolling element 50'.

[0071] The partially cylindrical design of the rolling element 50' increases the contact area between the support surface 63''' of the support element 60'' and the bearing surface 52 of the rolling element 50', thus reducing the local surface pressure between the rolling element 50' and the support element 60'''. This prevents stress peaks and results in a more homogeneous force transmission into the brake caliper 10'''.

[0072] The support element 60''' includes a middle section (see below). Fig. 6a, reference numeral 62) and two end sections adjacent to the middle section, opposite each other at the ends. In the area of ​​the end sections of the support element 60''', a clearance is formed on the brake caliper 10'''.

[0073] Fig. Figure 5 shows a fifth preferred embodiment of the brake 1'''' according to the invention, comprising a brake caliper 10 and a pressure piece 20 movably arranged in the brake caliper 10, which is coupled to a pair of brake shoes 30a,b. A lever 40 is pivotably mounted about an axis of rotation 42 in a known manner and is supported against the pressure piece 20. Furthermore, the brake 1'''' comprises a rolling element 50 for guiding along the axis of rotation 42 and pivotably supporting the lever 40, and a support element 60'''' for supporting the rolling element 50 against the brake caliper 10.

[0074] The in Fig. Brake 1 shown in section 5 differs from those shown above in the Fig. The brake 1, 1', 1'', 1''' shown in Figures 1 to 4 is designed by the fact that the support element 60'''' has, at least section by section, a negative curvature corresponding to the curvature of the rolling element 50 in a cross-sectional plane perpendicular to the axis of rotation 42. Thus, forces can be transferred from the rolling element 50 to the support element 60'''' in two spatial directions, and the rolling element 50 can be reliably supported along the axis of rotation 42.

[0075] A support section 16 is formed on the brake caliper 10, which is designed to absorb horizontal and any vertical forces and to align the support element 60'''' on the brake caliper 10.

[0076] The support element 60'''' is attached to the brake caliper 10 by means of a mounting interface 66. Due to the curvature of the support element 60'''', it conforms to the contour of the rolling element 50, which is cylindrical around the axis of rotation 42.

[0077] Fig. Figure 6a shows a section of the brake 1' in a sectional view, and in particular the rolling element 50, the support element 60 and the brake caliper 10.

[0078] The rolling element 50 is cylindrical around the axis of rotation 42. A support element 60 pivotably supports the rolling element 50 along the axis of rotation 42. The rolling element 50 is in contact with the support element 60 along the axis of rotation 42.

[0079] The support element 60 comprises a central section 62 which, in particular with a support surface 63''' formed on the rolling element side, is permanently in contact with a saddle bearing 12 of the brake caliper. If a central section was discussed but not shown in relation to the previous figures, it is preferably illustrated as shown here. Fig. 6a ordered.

[0080] The support element 60 has on the saddle side the mounting interface 66 for attachment to a corresponding mounting interface 14 of the saddle support 12, wherein in the assembled state the mounting surface 68 of the support element 60 in the area of ​​the middle section 62 is in contact with the saddle support 12.

[0081] The support element 60 further comprises two end sections 64a,b adjacent to the central section 62 and opposite each other at their ends. A clearance 70a,b is formed between each of the end sections 64a,b and the saddle support 12. The clearance 70a,b is wedge-shaped and extends in a cross-sectional plane parallel to the axis of rotation 42 at an angle α towards the central section 62.

[0082] The Fig. Figure 6b shows a detailed schematic representation of the clearance 70a,b. The respective end section 64a,b of the support element 60 has a recess 72 which alone forms the clearance 70a,b. The angle α is formed between the surface of the saddle bearing 12 of the brake caliper 10 and an opposite surface of the end section 64a,b. The clearance 70a,b extends at an acute angle to the central section 62 and is essentially wedge-shaped.

[0083] Fig. Figure 7a shows a sectional view of a section of brake 1 according to Fig. 1. Schematically according to a second preferred further education option. Fig. 7a and Fig. 7b differs from that in the Fig. 6a and Fig. In the embodiment shown in Figure 6b, the clearance 70a',b' is formed by a recess 74 in the surface of the caliper support 12' of the brake caliper 10. The surface of the caliper support 12' is raised in the region of the central section 62 and is in contact with the central section 62. The area of ​​the brake caliper 10 opposite each of the end sections 64a',b' of the support element 60 has a recess 42 for forming the clearance 70a',b'. The substantially wedge-shaped clearance 70a',b' is formed between the end sections 64a',b' of the support element 60 and a surface of the brake caliper 12' opposite each other and extends at an angle α towards the central section.

[0084] The in Fig. 8a and Fig. The embodiment shown in 8b differs from those shown in the Fig. 6 and Fig. In the embodiments shown in Figure 7, a recess 72 is formed in the end section 64a'', b of the support element 60, which forms part of the free space 70a'', b''. Furthermore, a recess 74 is formed in the surface of the saddle support 12'' in a region opposite the end section 64a'', b'', which together with the recess 72 forms the free space 70a'', b''. The free space 70a'', b'' is essentially wedge-shaped and extends in a cross-sectional plane perpendicular to the axis of rotation 42 at an angle α, which is enclosed between the end section and the respective opposite surface of the saddle support 12'', at an acute angle towards the central section 62.

[0085] The Fig. 9a and Fig. 9b shows a fourth embodiment of the Fig. Brake 1 shown. The ones in the Fig. 9a and Fig. The embodiment shown in 9b differs from those shown in the Fig. In embodiments 6 to 8, the length of the central section 62 is at most 10% of the length of the support element 60, and the central section 62 gradually transitions into the end sections 64a''',b'''. The support element 60 has a surface that is convexly curved along the axis of rotation 42, opposite the surface of the caliper bearing 12. The distance between the support element 60 and the surface of the caliper bearing 12 of the brake caliper 10 thus increases gradually in a plane parallel to the axis of rotation 42, starting from the center of the rolling element 50 and extending longitudinally towards the end sections 64a''',b'''. The distance available for the displacement of the support element 60 as a result of the loads acting on the rolling element 50 through the free space 70a''',b''' thus increases in the direction of the edge regions of the rolling element 50.

[0086] The in the Fig. The embodiments shown in 6 to 9 were implemented here for brake 1 according to Fig. 1 explained. The examples and explanations above apply equally to those in the Fig. 2 to 5 brakes 1', 1'', 1'''', 1'''' shown. In brakes 1'' and 1'''', the clearance 70a,b, 70a,b', 70a,b'', 70a'',b'''' is formed in a recess of the brake caliper 10'', 10''' in the area of ​​the end sections 64a,b, 64a,b', 64a,b'', 64a''',b''' of the support element 60'', 60''' integrally formed on the brake caliper 10'', 10''' and / or the caliper support 12, 12', 12'' in an area opposite the end sections 64a,b, 64a,b', 64a,b'', 64a',b'''. Reference symbol list 1, 1', 1'', 1''', 1'''' brake 10, 10', 10'', 10''' brake caliper 12, 12', 12'' saddle pad 14 Mounting interface 16 Support section 20 printed pieces 22 Pressure piece guide 23a,b Sliding surfaces 24 hinge 26 printing area 28 swivel bearings 30a, b brake shoes 40 levers 42 Rotation axis 44 Lever arm 46 first storage area 48 second storage area 50, 50' rolling elements 52 site area 60, 60', 60'', 60''', 60'''' Support element 62, 62'' middle section 63 Support surface 64a,b, 64a,b', 64a,b'', 64a,b''' end sections 66 Mounting interface 68, 68''' mounting surface 70a,b, 70a,b', 70a,b'', 70a,b''' Free space 72 Exclusion of the end sections 64a,b, 64a,b', 64a,b'', 64a,b''' 74 Brake caliper recess 10, 10', 10', 10'''

Claims

[1] Brake (1, 1', 1'', 1'''', 1''''), comprising: - a brake caliper (10, 10', 10'', 10''') with a caliper support (12, 12 ', 12''), - a pressure piece (20) movably mounted in the brake caliper (10, 10', 10'', 10'''), - a lever (40) mounted in the brake caliper (10, 10', 10'', 10'') so as to pivot about an axis of rotation (42), which is designed to transmit a braking force from a brake cylinder to the pressure piece (20), - a rolling element (50, 50') which guides the lever (40) along the axis of rotation (42) and pivotably supports it, and - a support element (60, 60', 60'', 60''', 60'''') for supporting the rolling element (50, 50') against the saddle support (12, 12 ', 12'') of the brake caliper (10, 10', 10'', 10'''), characterized by, that the support element (60, 60', 60'', 60'''', 60'''') has a central section (62, 62'''') and two end sections (64a,b, 64a',b', 64a''b'', 64a''',b''') adjacent to the central section (62), wherein the support element (60, 60', 60'', 60''', 60'''') and / or the saddle support (12, 12', 12'') are shaped such that between the end sections (64a,b, 64a',b', 64a'',b'', 64a''',b''') and the saddle support (12, 12 ', 12'') at least in an unloaded state of the brake (1, 1', 1'', 1''', 1'''')each a free space (70a,b, 70a',b', 70a'',b'', 70a'''',b'''') is formed. [2] Brake (1, 1'', 1'''', 1'''') according to claim 1, wherein the end sections (64a,b, 64a,b'', 64a'''',b'''') of the support element (60, 60', 60'', 60'''', 60'''') each have a recess to form a part of the free space (70a,b, 70a'',b'', 70a''',b''') with the saddle support (12, 12'') or the entire free space (70a,b, 70a,b', 70a,b'', 70a,b'''') which is bounded by the saddle support (12, 12''). [3] Brake (1, 1', 1'', 1'''', 1'''') according to claim 1 or 2, wherein the saddle support (12', 12'') has, in the respective area opposite the end sections (64a',b', 64a'',b'') of the support element (60, 60', 60'', 60'''', 60''''), a recess for forming part of the free space (70a,b' 70a,b'') with the end sections (64a,b', 64a,'') of the support element (60, 60', 60'', 60', 60'''') or a recess for forming the free space (70a,b' 70a,b') with the end sections (64a,b', 64a,b'') of the support element (60, 60', 60'', 60''', 60'''') has the free space (70a,b' 70a,b'') only provided at the support element (60, 60', 60'', 60'''', 60'''') . [4] Brake (1, 1', 1'', 1'''', 1'''') according to one of the preceding claims, wherein the clearance (70a,b, 70a',b', 70a'',b'', 70a'''',b'''') is shaped such that the surface of the saddle support (12', 12'') and the end sections (64a',b', 64a'',b'') do not have completely flat surfaces between which the clearance (70a,b, 70a',b', 70a'',b'', 70a'''',b'''') is formed. [5] Brake (1, 1', 1'', 1'''', 1'''') according to claim 4, wherein the free space (70a,b, 70a,b', 70a,b'', 70a'''',b'''') in a cross-sectional plane parallel to the axis of rotation (42) has an angle α greater than 0.5°, which is enclosed by the end sections (64a,b, 64a',b', 64a'',b'', 64a''',b'''') and the saddle support (12, 12', 12''). [6] Brake (1, 1', 1'', 1'''', 1'''') according to one of the preceding claims, wherein the length of the middle section (62) is at least 50%, in particular at least 65% of the length of the support element (60, 60', 60'', 60'''', 60''''). [7] Brake (1, 1', 1'', 1''', 1'''') according to any one of claims 1 to 5, where the length of the middle section (62''') is at most 20% of the length of the support element (60, 60', 60'', 60'''', 60''''), the middle section (62''') gradually transitions into the end sections (64a''',b''') and the support element (60, 60', 60'', 60'''', 60'''') has a convexly curved surface (68'') opposite the surface of the saddle support (12) along the axis of rotation (42). [8] Brake (1'''') according to one of the preceding claims, wherein the rolling element (50) is semi-cylindrical or cylindrical, and the support element (60'''') has a negative curvature in a cross-sectional plane perpendicular to the axis of rotation (42) corresponding to the curvature of the rolling element (50). [9] Brake (1'', 1'''') according to one of the preceding claims, wherein the support element (60'', 60'''') is integrally formed on the brake caliper (10'', 10'') and the free space (70a,b, 70a',b', 70a'',b'', 70a''',b''') is formed in a projection of the brake caliper (10'', 10'''). [10] Brake (1, 1', 1''') according to any one of claims 1 to 8, wherein the support element (60, 60', 60'''') is designed as a separate part of the brake caliper (10, 10', 10'''') and has a mounting interface (66) for attachment to a corresponding mounting interface (14) of the brake caliper (10, 10', 10''''). [11] Brake caliper (10, 10', 10'', 10''') for a brake, (1, 1', 1'', 1''') according to one of the preceding claims, wherein the brake comprises: - a pressure piece (20) movably mounted in the brake caliper (10, 10', 10'', 10'''), - a lever (40) pivotably mounted in the brake caliper (10, 10', 10'', 10''') for transmitting a braking force from a brake cylinder to the pressure piece (20), - a rolling element (50, 50') which guides the lever (40) along the axis of rotation (42) and pivotably supports it, and - a support element (60, 60', 60'', 60''', 60''''), wherein the brake caliper (10, 10', 10'', 10'''') comprises a caliper support (12, 12', 12'') and the support element (60, 60', 60'', 60'''', 60'''') is configured to support the rolling element (50, 50') against the caliper support (12', 12'') of the brake caliper (10, 10', 10'', 10''''), characterized by, that the support element (60, 60', 60'', 60'''', 60'''') has a central section (62) and two end sections (64a',b', 64a'',b'',) adjacent to the central section (62) and opposite each other, wherein the saddle support (12', 12'') is shaped such that a free space (70a',b', 70a'',b'') is formed between the end sections (64a',b', 64a'',b'') and the saddle support (12', 12'') in an unloaded state of the brake. [12] Brake caliper (10, 10', 10'', 10'''') according to claim 11, wherein the support element (60, 60', 60'', 60'''', 60'''') has a mounting interface (66), and the brake caliper (10, 10', 10', 10'''') has a corresponding mounting interface (14) for coupling with the mounting interface (66) of the support element (60, 60', 60'', 60'''', 60''''). [13] Brake caliper (10, 10', 10', 10''') according to claim 11, wherein the support element (60, 60', 60'', 60'''', 60'''') for supporting the rolling element (50, 50') is formed as an integral part of the brake caliper (10, 10', 10', 10'''') and the clearance (70a',b', 70a'',b'') is formed in a projection of the brake caliper (10, 10', 10', 10''''). [14] Support element (60, 60', 60'', 60''', 60'''') for a brake (1, 1', 1'', 1''') according to one of the preceding claims, wherein the brake comprises: - a brake caliper (10, 10', 10', 10''') with a caliper support (12, 12''), - a pressure piece (20) movably mounted in the brake caliper (10, 10', 10', 10'''), - a lever (40) pivotably mounted in the brake caliper (10, 10', 10'', 10''') for transmitting a braking force from a brake cylinder to the pressure piece (20), - a rolling element (50, 50') which guides the lever (40) along the axis of rotation (42) and pivotably supports it, and - a support element (60, 60', 60'', 60''', 60'''') for supporting the rolling element (50, 50') against the saddle support (12, 12'') of the brake caliper (10, 10', 10', 10'''), characterized by , that the support element (60, 60', 60'', 60'''', 60'''') has a central section (62, 62') and two end sections (64a,b, 64a'',b'', 64a'''',b'''') adjacent to the central section (62, 62'), and that the support element (60, 60', 60'', 60'''', 60'''') is shaped such that a free space (70a,b, 70a'',b'', 70a'''', b'''') is formed between the end sections (64a,b, 64a'',b'', 64a'''',b'''') and the saddle support (12, 12'') in an unloaded state of the brake.

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