Brake caliper for a vehicle brake

Description

[0001] The invention relates to a brake caliper for a vehicle brake, in particular a commercial vehicle disc brake, comprising a bolt guide for axially displacing the brake caliper on a brake carrier, and a bolt axially displaceable in the bolt guide, wherein the bolt has a bushing arranged around the bolt.

[0002] Noises, particularly rattling noises, are generated within the brake caliper bolt guide. These are often bothersome, especially in bus brakes, where the brakes are frequently located directly beneath the driver's seat or passenger seats. The noises result from excessive radial play on the brake caliper bolt side. This radial play is caused by the compensation of component tolerances.

[0003] EP2217825 A1 discloses a brake disc bolt guide with a damping element, wherein the damping element is integrated on the outer circumference of a guide bar. The guide bar has recesses on its outer circumference in which the damping element is arranged. Additionally, the damping element is a hollow body formed from grooves and webs, which is complex to manufacture.

[0004] WO2005 / 124179A1 and GB2156924 A reveal further alternatives of damping elements in the bolt guide of disc brakes.

[0005] The invention is based on the objective of addressing at least one of the aforementioned disadvantages, in particular providing a brake caliper in which noise emission during use is reduced.

[0006] The problem is solved by a brake caliper having the features of claim 1. Advantageous embodiments of the invention are specified in the dependent claims.

[0007] According to the invention, the brake caliper comprises, in addition to the bushing and adjacent to it, at least one damping element. , The damping element completely surrounds the bolt and is designed to dampen relative movement in the radial direction between the bolt and the bolt guide. The damping element is designed to limit radial play or the overall play of the components caused by individual part tolerances. This proposes a simple and cost-effective solution to the problem. The damping element can be integrated into the existing brake caliper without significantly modifying it.

[0008] According to the invention, the damping element is arranged adjacent to the bushing; in particular, the damping element is arranged at least partially in contact with the bushing. The damping element can touch the bushing, or partially touch it, or be arranged at a distance from the bushing.

[0009] Preferably, the brake caliper has a sealing element, wherein the damping element is part of the sealing element. The sealing element is arranged at one outer end of the bolt and seals around it. It protects the bolt guide from external influences, in particular from dirt and moisture. The sealing element is made of an elastomeric material. The damping element is integrally arranged as an axial extension of the sealing element. Preferably, a hollow cylindrical damping element is integrally connected to the sealing element. This allows an additional element to be easily integrated into the brake caliper without significantly increasing the assembly effort.

[0010] Preferably, the inner contour of the damping element, particularly in its unmounted state, has an oval cross-section, more specifically a circular or elliptical one, wherein the damping element has a hollow cylindrical shape at least in sections. If the damping element has a hollow cylindrical shape, the cross-section of its inner contour is circular. In its mounted state, the damping element is arranged coaxially with the bolt. The elliptical shape, in particular, is designed to bridge the radial play between the bolt and the bolt guide. Preferably, the outer contour of the damping element has the same shape as its inner contour, so that the thickness of the damping element is constant. In In another embodiment, the inner contour can be elliptical and the outer contour circular, or vice versa.

[0011] Preferably, the inner diameter of the damping element is smaller than the inner diameter of the bushing. The damping element has an annular cross-sectional area, with the inner recess of the ring designed to receive the bolt. The inner diameter is measured at a cross-sectional area of ​​the recess. For non-circular cross-sectional areas, the inner diameter is measured at the smallest diagonal of the cross-sectional area. If the cross-sectional area is not constant along the length of the damping element or the bushing, the smallest diameter is used for comparison.

[0012] Preferably, the damping element is partially or completely made of an elastomer; in particular, the bushing is partially or completely made of a metal. The bushing should be as wear-resistant and stable as possible. For this reason, it is advantageous to integrate an additional element, i.e., a damping element, in addition to the conventionally used bushing, which has a different material than the bushing. Elastomers are able to reversibly absorb large deformations. Therefore, they are designed to bridge tolerances and dampen vibrations.

[0013] Preferably, the damping element includes a reinforcing element, which is particularly likely to be made partially or entirely of metal. This increases the stability of the damping element, which can be advantageous when mounting the damping element on the bolts. In particular, the material of the reinforcing element has a higher stiffness than the elastomer material of the damping element. For example, instead of metal, a plastic, such as a thermoset, or a composite material can be used. The reinforcing element can be in the form of rods, rings, or plates. If the brake caliper has multiple damping elements, all damping elements, some damping elements, or none of the damping elements can have a reinforcing element.

[0014] Preferably, the reinforcing element is completely encased within the damping element. This largely prevents damage to the bolt guide during assembly or use within the guide.

[0015] Preferably, the damping element is a first damping element, and the brake caliper additionally has a second damping element. The damping elements are arranged on opposite sides of the bushing, preferably adjacent to the bushing. Using a second damping element can further enhance the damping characteristics. For example, largely constant damping along the length of the bolt guide is possible. An arrangement of the damping elements on opposite sides of the bushing means that the first damping element is positioned adjacent to the first end face of the bushing, and the second damping element is positioned adjacent to the second end face of the bushing. One or both of the damping elements can also be arranged in direct contact with the bushing.

[0016] Exemplary embodiments of the invention are now described below with reference to the drawings. These drawings are not necessarily intended to represent the exemplary embodiments to scale; rather, where explanatory, they 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 details of an embodiment can be made without deviating from the general idea of ​​the invention. The features of the invention disclosed in the description, the drawings, and the claims can be essential for the further development of the invention, both individually and in any combination.

[0017] Various modifications and alternatives are possible without deviating from the scope of the invention as defined in the attached claims.

[0018] 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.

[0019] Further advantages, features, and details of the invention will become apparent from the following description of the preferred embodiments and from the following figures. Specifically, the figures show: Fig. 1: a schematic detail view of the brake caliper according to Fig. 1 in a first embodiment; Fig. 2: a schematic detail view of the brake caliper according to. Fig. 1in a second embodiment; Fig. 3: a schematic detail view of the brake caliper according to. Fig. 1 in a third embodiment; and Fig. 4: a perspective view of a damping element in one embodiment;

[0020] The Figures 1 to 3 Each figure shows a schematic detail view of a brake caliper 100. The brake caliper 100 has a bolt guide 110, which is designed as a recess or bore in the brake caliper 100.

[0021] The bolt guide 110 is designed for axial displacement of the brake caliper 100 on a brake carrier (not shown).

[0022] A bolt 122 is axially displaceable within the bolt guide 110. The axial direction is indicated by arrow A.

[0023] The bolt guide 110 is covered from the outside by a cover 129.

[0024] A bushing 124 is arranged around the bolt 122. The bolt 122 is arranged coaxially with the bushing 124, so that the bushing 124 completely surrounds the bolt 122.

[0025] The brake caliper 100 also has a damping element 130 in addition to the bushing 124 and adjacent to it.

[0026] The damping element 130 is arranged around the bolt 122. The bolt 122 is arranged coaxially with the damping element 130, so that the damping element 130 completely surrounds the bolt 122.

[0027] The damping element 130 has a shorter length than the bolt 122. Furthermore, the bolt 122 has a greater length than the combined length of the damping element 130 and the bushing 124.

[0028] The damping element 130 is designed to dampen a relative movement in the radial direction, characterized by the arrow R, between the bolt 122 and the bolt guide 110.

[0029] The damping element 130 is arranged adjacent to the bushing 124. According to the invention, an end face of the damping element 130 is arranged adjacent to an end face of the bushing 124. The end faces can also be arranged in direct contact with each other.

[0030] The damping element 130 is made of an elastomer. The bushing 124 is made of a metal.

[0031] Furthermore, the inner diameter 130d of the damping element 130 is smaller than the inner diameter 124d of the bushing 124.

[0032] How especially the Figure 1 and 3 As shown, in one embodiment the damping element 130 has a reinforcing element 132. In another embodiment, the damping element 130 does not have a reinforcing element 132. The reinforcing element 132 is a metal ring or a metal rod which is embedded in the damping element 130.

[0033] According to a first embodiment, see here Figure 1 The brake caliper 100 further comprises a sealing element 126. The sealing element 126 is arranged at an outer end of the bolt 122, preferably at an end opposite the end at which the head of a socket head cap screw 128 is arranged. The socket head cap screw 128 is arranged in the bolt 122. The damping element 130 is part of the sealing element 126. In further embodiments not shown, the brake caliper 100 comprises several, preferably two, sealing elements. Preferably, the damping element 130 is part of the second sealing element.

[0034] According to a second embodiment, which can be implemented as an alternative to the first embodiment, see here. Figure 2The brake caliper 100 has a damping element 130. The damping element 130 is located adjacent to the bushing 124 and adjacent to the cover 129. The damping element 130 is designed as a single component.

[0035] According to a third embodiment, see here Figure 3 The brake caliper 100 has a first damping element 130' and additionally a second damping element 130". The exemplary embodiments of the Figure 1 and 2The damping elements 130' and 130" are combined. They are arranged on opposite sides of the bushing 124. The first damping element 130' is arranged adjacent to a first end face of the bushing 124. The third embodiment further comprises the sealing element 126 according to the first embodiment. Preferably, the first damping element 130' is integrally formed with the sealing element 126. The second damping element 130' is arranged adjacent to the second end face of the bushing 124. The second damping element 130' is also arranged adjacent to the cover 129.

[0036] Fig. 4 shows a damping element 130, 130', 130" for use with the embodiments of the Figures 1 to 2in the unmounted, undeformed state. The inner contour 134 of the damping element 130 has an oval cross-section. In this embodiment, the damping element 130 has an elliptical inner contour 134. Furthermore, the cross-sectional area of ​​the damping element 130 is annular. The outer contour 136 of the damping element 130 is circular. Thus, the thickness varies along the cross-sectional area around the circumference. In other embodiments, the damping element 130 can have a hollow cylindrical shape, at least in sections. With the oval inner contour 134 in this embodiment, the inner diameter of the damping element 130d is the smallest diameter of the cross-sectional area. Reference symbol list (part of the description)

[0037] 100 Brake caliper 110 Bolt guide 122 Bolt 124 Bushing 124d Inner diameter of bushing 126 Sealing element 128 Cylinder screw 129 Cover 130 Damping element 130d Inner diameter of damping element 130' First damping element 130" Second damping element 132 Reinforcement element 134 Inner contour 136 Outer contour Aaxial direction Radial direction

Claims

1. Brake caliper (100) for a vehicle brake, in particular a commercial vehicle disc brake, comprising a bolt guide (110) for axially displacing the brake caliper (100) on a brake carrier, and a bolt (122) which is received so as to be axially displaceable in the bolt guide (110), the bolt (122) comprising a bushing (124) arranged around the bolt (122), the brake caliper (100) comprising in addition to the bushing (124) at least one damping element (130) which borders on said bushing, the damping element (130) circumferentially surrounding the bolt (122) and being designed to damp a relative movement in the radial direction between the bolt (122) and the bolt guide (110), and the damping element (130) being arranged adjacent to the bushing (124), in particular the damping element (130) is arranged in contact with the bushing (124) at least in portions, characterized in that an end face of the damping element (130) is arranged adjacent to an end face of the bushing (124).

2. Brake caliper (100) according to claim 1, characterized in that the brake caliper (100) comprises a sealing element (126), the damping element (130) being a part of the sealing element (126).

3. Brake caliper (100) according to either of the preceding claims, characterized in that an inner contour (134) of the damping element (130), in particular in the unassembled state, has an oval-shaped, in particular circular or elliptical, cross section, in particular the damping element (130) having a hollow-cylindrical shape at least in portions.

4. Brake caliper (100) according to any of the preceding claims, characterized in that the inner diameter (130d) of the damping element (130) is smaller than the inner diameter (124d) of the bushing (124).

5. Brake caliper (100) according to any of the preceding claims, characterized in that the damping element (130) is formed partially or completely from an elastomer, in particular the bushing (124) being formed partially or completely from a metal.

6. Brake caliper (100) according to any of the preceding claims, characterized in that the damping element (130) comprises a reinforcing element (132), in particular the reinforcing element (132) being formed partially or completely from a metal.

7. Brake caliper (100) according to claim 6, characterized in that the reinforcing element (132) is arranged so as to be completely encased in the damping element (130).

8. Brake caliper (100) according to any of the preceding claims, characterized in that the damping element is a first damping element (130') and the brake caliper (100) additionally comprises a second damping element (130"), the damping elements (130, 130', 130") being arranged relative to the bushing (124) on opposite sides of the bushing (124), preferably bordering on the bushing (124).