Disc Brake for a Utility Vehicle

Abstract

A disc brake for a utility vehicle includes a brake caliper which straddles a brake disc and which is held displaceably on a stationary brake carrier by two guide bars, each guide bar having a guide bushing which is connected to the brake carrier by way of a screw that is screwed into a threaded hole of the brake carrier and which is held on the brake carrier for conjoint rotation therewith. The disc brake is designed in such a way that the end face of the guide bushing bearing against the brake carrier has a peripheral projection which is pressed against the associated surface of the brake carrier.

Claims

1.-10. (canceled)

11. A disc brake for a utility vehicle, comprising: a brake caliper which straddles a brake disc in use, and which is held movably on a stationary brake carrier by two guide bars, wherein each guide bar has a guide bushing, which is connected to the brake carrier via a screw that is screwed into a threaded hole of the brake carrier, and which guide bushing is held in a rotationally secure manner on the brake carrier, wherein an end face of the guide bushing resting against the brake carrier has an encircling projection, which is pressed against an associated surface of the brake carrier.

12. The brake disc as claimed in claim 11, wherein the projection is harder than material of the brake carrier.

13. The disc brake as claimed in claim 11, wherein a contact surface of the guide bushing with the brake carrier, and the projection, are provided with at least one of: a paste that increases the friction coefficient, a coating that hardens, or an insert that increases the friction coefficient.

14. The disc brake as claimed in claim 11, wherein the projection is configured as a ridge.

15. The disc brake as claimed in claim 14, wherein the ridge is triangular in cross section.

16. The disc brake as claimed in claim 11, wherein the projection is provided on an edge region of a contact surface associated with a circumferential side of the guide bushing.

17. The disc brake as claimed in claim 11, wherein the projection is provided approximately in a middle region of a contact surface associated with a circumferential side of the guide bushing.

18. The disc brake as claimed in claim 14, wherein the ridge is configured as an isosceles or non-isosceles triangle in cross section.

19. The disc brake as claimed in claim 11, wherein the projection has a flattened end surface.

20. The disc brake as claimed in claim 11, wherein the guide bushing has, on the end face facing the brake carrier, a concentric collar, which projects relative to a radially adjoining contact surface extending toward the circumferential side of the guide bushing and is fitted into a recess in the brake carrier.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 shows a brake carrier with installed guide bars in a sectioned perspective view;

[0025] FIG. 2 shows the connecting region of a guide bar to a brake carrier in a sectioned side view;

[0026] FIG. 3 shows an enlarged detail of the connecting region, corresponding to reference III in FIG. 2;

[0027] FIG. 4 and FIG. 5 each show different variant embodiments of the invention in a perspective view;

[0028] FIG. 6 shows another exemplary embodiment of the invention in the connecting region of the guide bar to a brake carrier; and

[0029] FIG. 7 shows the guide bushing according to FIG. 6 in a perspective view.

DETAILED DESCRIPTION OF THE DRAWINGS

[0030] FIG. 1 illustrates a brake carrier 1, which is held in a fixed location on a vehicle while in operation and has mutually opposite brake carrier horns 5, against which brake pads (not shown) of a disc brake rest.

[0031] Guide bars 2 are secured on two brake carrier horns 5 situated opposite one another in alignment, for which purpose a screw 4 is passed through a cylindrical guide bushing 3 of the guide bar 2 and screwed into a threaded hole 8 (FIG. 2) in the associated brake carrier horn 5.

[0032] Mounted in an axially movable manner on these guide bars 2 is a brake caliper (not shown), which is also known as a sliding caliper.

[0033] The screw 4 used is preferably a hexagon socket screw, the head of which lies in a recess in the guide bushing 3.

[0034] On its end face facing the brake carrier 1, the guide bushing 3 has, as can be seen very clearly in FIG. 2, a collar 6 of relatively small diameter, which lies in a recess 7 of the threaded hole 8.

[0035] The end face of the guide bushing 3 facing the brake carrier horn 5, namely a contact surface 9 starting radially from the collar 6, has an encircling projection 10, designed as a ridge in the example, which is arranged in the radial end region of the contact surface 9 associated with the circumferential surface of the guide bushing 3.

[0036] In FIG. 3, the projection 10, which is triangular in cross section in the example, can be seen in an enlarged illustration, and it can also be seen that the projection 10 is pressed into the surface of the brake carrier horn 5, with the material of the brake carrier 1 being deformed.

[0037] The example of the projection 10 shown in FIGS. 2 and 3 is depicted once again in FIG. 4, wherein the design of the projection 10 as a ridge is clearly visible.

[0038] In FIG. 5, which reproduces the end region of the guide bushing 3 provided with the projection 10, the projection 10 designed as a ridge is formed approximately in the middle of the radial contact surface 9.

[0039] Another variant of the projection 10 can be seen in FIGS. 6 and 7, wherein FIG. 6 reproduces the connecting region of the guide bushing 3 to the brake carrier horn 5 in section. Particularly in FIG. 7, which shows a view comparable to FIGS. 4 and 5, it can be seen that the projection 10 has a flat shape arranged on the outer edge region of the contact surface 9, as a result of which a high surface pressure is achieved in the contact region of the projection 10 with the surface of the brake carrier horn 5.

LIST OF REFERENCE SIGNS

[0040] 1 brake carrier [0041] 2 guide bar [0042] 3 guide bushing [0043] 4 screw [0044] 5 brake carrier horn [0045] 6 collar [0046] 7 recess [0047] 8 threaded hole [0048] 9 contact surface [0049] 10 projection