Brake Drum for a Vehicle Drum Brake

Abstract

A brake drum for a drum brake, in particular of a motor vehicle, includes a cylindrical jacket and a support pot which axially adjoins the jacket and which has a hub ring portion to be secured to a wheel hub. The monolithic brake drum is formed at least in part of a fiber-reinforced plastic.

Claims

1. A brake drum for a drum brake, comprising: a cylindrical casing; and a carrier pot that axially adjoins the cylindrical casing, the carrier pot including a hub ring portion configured to fix to a wheel hub, wherein the brake drum, which is formed in one piece, is formed at least in part from a fiber reinforced plastic.

2. The brake drum as claimed in claim 1, wherein the brake drum is formed entirely from a fiber reinforced plastic.

3. The brake drum as claimed in claim 1, wherein the brake drum comprises one or more supporting fibers extending in conformity with a load path.

4. The brake drum as claimed in claim 1, wherein a cylindrical friction ring is arranged on an inside of the cylindrical casing.

5. The brake drum as claimed in claim 4, wherein the friction ring comprises metallic or ceramic components.

6. The brake drum as claimed in claim 1, wherein the brake drum comprises at least one radially inner area of the carrier pot and at least one radially outer area of the carrier pot, wherein the radially inner area is arranged axially offset in relation to the radially outer area, wherein the carrier pot comprises a transition between the radially inner area and the radially outer area, and wherein the transition comprises a curvature.

7. The brake drum as claimed in claim 6, wherein the curvature has a radius of at least 2 mm.

8. The brake drum as claimed in claim 1, wherein a transition from the cylindrical casing into the carrier pot comprises a curvature, and wherein the curvature has a radius of at least 2 mm.

9. The brake drum as claimed in claim 4, wherein the friction ring is at least partially enclosed by the material of the brake drum in order to embed the friction ring in the brake drum.

10. The brake drum as claimed in claim 4, wherein the friction ring is attached to the brake drum by a fiber tie, and wherein fiber tie connects the friction ring on the one hand and the brake drum on the other.

11. The brake drum as claimed in claim 9, wherein the friction ring is attached to the fiber reinforced plastic by one or more retaining fibers.

12. A drum brake apparatus for a wheel brake of a vehicle, comprising: at least one brake drum, including: a cylindrical casing, and a carrier pot that axially adjoins the cylindrical casing, the carrier pot including a hub ring portion configured to fix to a wheel hub, the brake drum, which is formed in one piece, being formed at least in part from a fiber reinforced plastic; and at least one brake shoe displaceably arranged in or on the brake drum, the at least one brake shoe configured to be pressed against the brake drum in order to perform a braking operation.

13. The brake drum as claimed in claim 1, wherein the drum brake is a drum brake of a motor vehicle.

14. The brake drum as claimed in claim 7, wherein the curvature has a radius of at least 6 mm.

15. The brake drum as claimed in claim 8, wherein the transition is a casing transition, and wherein the curvature has a radius of at least 6 mm.

16. The brake drum as claimed in claim 9, wherein the friction ring is encased by the material of the brake drum in order to embed the friction ring in the brake drum.

17. The drum brake apparatus as claimed in claim 12, wherein the vehicle is configured as a motor vehicle.

Description

[0018] The invention will be explained in more detail below with reference to several figures, of which

[0019] FIG. 1 shows an advantageous brake drum,

[0020] FIG. 2 shows the advantageous brake drum in FIG. 1 in cross section,

[0021] FIG. 3 shows a friction ring which is embedded in the brake drum,

[0022] FIG. 4 shows a friction ring which is connected to the brake drum by a fiber tie, and

[0023] FIG. 5 shows a friction ring which comprises cooling fins extending radially outwards.

[0024] FIG. 1 shows an advantageous brake drum 1. The brake drum 1 comprises a cylindrical casing 2 and an axially adjoining carrier pot 3. The brake drum 1 and in particular the cylindrical casing 2 and the adjoining carrier pot 3 are formed in one piece, at least in part from a fiber reinforced plastic. The advantage of this is that the brake drum 1 can be made significantly lighter in weight than a steel brake drum, the fiber reinforced plastic successfully achieving this for the same strength and stability. Radially inside, the carrier pot comprises a hub ring on the portion for fixing to a wheel hub 5 (not shown in FIG. 1), openings 6 being provided for fixing to the wheel hub 5. FIG. 1 further shows a supporting fiber 7, which extends in conformity with the load path. The supporting fiber extending in conformity with the load path in particular ensures that the forces occurring in the cylindrical casing 2 during a braking operation can be transmitted to the carrier pot 3 and in particular the openings 6.

[0025] FIG. 2 shows the advantageous brake drum 1 in FIG. 1 in cross section, in which a cylindrical friction ring 8 is shown situated inside the cylindrical casing 2. FIG. 2 further shows that the carrier pot 3 comprises a curved transition 9 between a radially inner area and a radially outer area, the radially inner area and the radially outer area being axially offset. The curved shape of the transition 9 has the advantage that fibers present in the fiber reinforced plastic cannot break due excessive bending.

[0026] FIG. 2 further shows a curved transition 10, in particular a curved casing transition, between the cylindrical casing and the axially adjoining carrier pot 3. Here too, the curved transition has the advantage that at a point where particularly high forces occur in the braking operation the fibers present in the fiber reinforced plastic are not bent by the curvature in such a way that they might break and be no longer capable of performing their function of additional reinforcement.

[0027] The detail 11 furthermore identifies an area which in the following FIGS. 3 to 5 shows further details for the application of the friction ring 8 to the brake drum 1.

[0028] FIG. 3 shows the detail 11 in FIG. 2 according to a further exemplary embodiment, in which the friction ring is encased in the material of the brake drum 2. This affords the advantage that a solid, in particular materially bonded union is produced between the brake drum 2 and the friction ring 8.

[0029] FIG. 4 likewise shows the detail 11 in FIG. 2 according to a further exemplary embodiment, in which the friction ring 8 on the fiber reinforced plastic is attached to the brake drum 2 by means of a fiber tie 12, and retaining fibers 13 are additionally introduced for attachment to the fiber reinforced plastic. This has the advantage that due to the fiber tie 12 and the additional retaining fibers 13 a particularly stable union can be achieved between the brake drum 1, in particular the cylindrical casing 2, so that the forces introduced into the friction ring 8 during a braking operation can be optimally transmitted to the brake drum 2 and thereby to the wheel hub 5 (not shown in FIG. 4 here).

[0030] FIG. 5 likewise shows the detail 11 in FIG. 2 according to a further exemplary embodiment, in which the friction ring 8 comprises cooling fins 14 extending outwards. This has the advantage in particular that the heat generated on the friction ring 8 during the braking operation can be optimally conducted outwards to the surrounding air via the cooling fins 14.