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DE-102024132968-A1 - Floating caliper disc brake, especially for a commercial vehicle

DE102024132968A1DE 102024132968 A1DE102024132968 A1DE 102024132968A1DE-102024132968-A1

Abstract

A floating caliper disc brake (1) comprising a brake carrier (4) and a brake caliper (2) floating relative to the brake carrier (4), wherein the bearing is provided by a sliding bearing bushing (10), characterized in that the sliding bearing bushing (10) is designed as a one-piece plastic sleeve (11) with a sliding coating (16) on the inner circumference of the plastic sleeve (11).

Inventors

  • Alexander Asen

Assignees

  • KB INTELLECTUAL PROPERTY GMBH & CO. KG

Dates

Publication Date
20260513
Application Date
20241112

Claims (14)

  1. Floating caliper disc brake (1) comprising a brake carrier (4) and a brake caliper (2) floating relative to the brake carrier (4), wherein the bearing is provided by a sliding bearing bushing (10), characterized in that the sliding bearing bushing (10) is designed as a one-piece plastic sleeve (11) with a sliding coating (16) on the inner circumference of the plastic sleeve (11).
  2. Floating caliper disc brake according to Claim 1 , characterized in that the plastic sleeve (11) has several axially arranged coating areas (17, 18) of a sliding coating (16) along its inner circumference and a coating-free area (19) which is arranged between the coating areas (17, 18).
  3. Floating caliper disc brake according to Claim 1 or 2 , characterized in that the plastic sleeve (11) has a greater wall thickness than the layer thickness of the sliding coating (16), wherein the plastic sleeve (11) is preferably at least twice as thick and particularly preferably at least three times as thick as the sliding coating (16).
  4. Floating caliper disc brake according to one of the preceding claims, characterized in that the plastic sleeve (11) is axially secured, preferably axially end-secured, in a receiving channel (14c) of a brake caliper (2).
  5. Floating caliper disc brake according to one of the preceding claims, characterized in that the plastic sleeve (11) is arranged in the receiving channel (12) in a rotationally secured manner via at least one positive locking means (13), preferably via one or more radial projections (14), preferably via circumferentially distributed radial projections (14).
  6. Floating caliper disc brake according to one of the preceding claims, characterized in that the plastic sleeve (11) is mounted on the sliding coating (16) so as to slide relative to a guide bar (26) which is fixed to a brake carrier (4).
  7. Floating caliper disc brake according to one of the preceding claims, characterized in that the coating areas (17, 18) have different layer thicknesses relative to each other.
  8. Floating caliper disc brake according to one of the preceding claims, characterized in that the plastic sleeve (11) has the same inner diameter in the coating-free area (19) and in the coating areas (17, 18).
  9. Floating caliper disc brake according to one of the preceding claims, characterized in that the outer diameter of the plastic sleeve (11) is reduced in an end region of the plastic sleeve (11).
  10. Floating caliper disc brake according to one of the preceding claims, characterized in that the plastic sleeve (11) is made of a fiber-reinforced, preferably high-strength, plastic.
  11. Floating caliper disc brake according to one of the preceding claims, characterized in that the plastic sleeve (11) has a constant inner diameter over the entire longitudinal extent of the plastic sleeve (11).
  12. Floating caliper disc brake according to one of the preceding claims, characterized in that the central coating-free area (19) extends over at least 20% of the longitudinal extent and a maximum of 60% of the longitudinal extent of the plastic sleeve (11).
  13. Floating caliper disc brake according to one of the preceding claims, characterized in that the sliding coating (16) consists of a material that reduces sliding friction compared to the material of the plastic sleeve (11), preferably of a PFA, particularly preferably of PTFE.
  14. Floating caliper disc brake according to one of the preceding claims, characterized in that the sliding bearing bushing (10) is designed as part of a fixed bearing (5) or a main guide bearing in the floating caliper disc brake (1).

Description

The present application relates to a floating caliper disc brake according to the preamble of claim 1. The floating mounting of a brake caliper relative to a brake carrier is typically achieved via bearings in floating caliper brakes. These are referred to as main guide bearings and compensating bearings and are typically designed as a fixed and a floating bearing. A well-known design variant of such a bearing for supporting the floating caliper of a disc brake is in 3 The bearing arrangement is illustrated. Here, the bearing is provided by a multi-part bearing assembly consisting of sleeve-shaped components with varying inner and outer diameters. Due to the different outer diameters of the sleeves in the bearing assembly, it is difficult to create a one-piece bearing arrangement using a steel-backed bushing. Furthermore, the varying wall thicknesses of the plain bearing sleeves in this assembly lead to disadvantages regarding their availability. Furthermore, from the EP 2 084 422 B1 A plain bearing is known which comprises an elastomer sleeve with a metallic support sleeve. The metallic support sleeve has an inner and outer contour that enables axial support of this bearing element within a receptacle of the brake caliper and axial fixation of the elastomer sleeve. However, this anchoring contour can also lead to increased friction after elastomer wear. The elastomer sleeve is designed as a liner with a correspondingly thick thickness. As the elastomer wears, the dimensional accuracy of the plain bearing decreases and the clearance increases. Based on the aforementioned prior art, the object of the present invention is now to provide a plain bearing that is easy to manufacture and therefore readily available, with high dimensional accuracy and good emergency running properties. The invention solves the problem of the present invention with a floating caliper disc brake having the features of claim 1. A floating caliper disc brake according to the invention comprises a brake carrier and a brake caliper that is floating relative to the brake carrier. The brake caliper is mounted via a sliding bearing bushing. This bushing can be arranged to slide on a guide rail of a brake carrier. Conversely, the guide rail can also be located on the brake caliper and the sliding bearing bushing on the brake carrier. According to the invention, the sliding bearing bushing is designed as a one-piece plastic sleeve with a sliding coating on the inner circumference of the plastic sleeve. The guide rail is preferably supported exclusively by this single sliding bearing bushing. The one-piece design and material selection make it possible to create a plain bearing bushing with high dimensional accuracy and good emergency running properties. Further advantageous embodiments of the invention are the subject of the dependent claims. It is advantageous if the plastic sleeve has several axially arranged coating areas of a sliding coating along its inner circumference and a coating-free area which is arranged between the coating areas. The plastic sleeve can particularly preferably have a greater wall thickness than the coating layer thickness, wherein the plastic sleeve is preferably at least twice as thick and particularly preferably at least three times as thick as the coating. Typically, a sliding coating exhibits comparatively low mechanical stability. Therefore, an additional support body is often used for mechanical fixation. When using a thick-walled liner or a thick coating made of a sliding material, an undesirably large amount of play can develop with increasing wear and erosion of the sliding material. The plastic sleeve can be advantageously secured axially for consistent positioning, preferably secured axially at the end in a receiving channel of a brake caliper. The plastic sleeve can advantageously be secured against rotation by at least one positive locking element, preferably by one or more radial projections, and particularly preferably by circumferentially distributed radial projections, in a receiving channel. The receiving channel can be arranged in a brake caliper, e.g., as a bore. Accordingly, the receiving channel has one or more recesses corresponding to the projections. Preferably, the plastic sleeve can be mounted on the sliding coating so that it slides relative to a guide bar which is fixed to a brake carrier. Preferably, the coating areas spaced apart on the inner circumference of the plastic sleeve can have different layer thicknesses. The plastic sleeve can have the same inner diameter in both the uncoated and coated areas, which is advantageous from a manufacturing perspective. Different inner diameters can be achieved by applying coatings with varying layer thicknesses. An axial stop can be advantageously provided by reducing the outer diameter of the plastic sleeve in one end region. The plastic sleeve can be made particularly stable from a fiber-reinforced plastic and preferably from a high-strengt