Abstract
A drum brake for a motor vehicle has a pocket for collecting abraded brake particles. The pocket is accessible from above via an opening. After the introduction of a suction device into the opening, the abraded brake particles can be extracted by suction. Pollution of the environment with abraded brake particles is thereby avoided.
Claims
1. A drum brake for a motor vehicle comprising: a rotatably mounted brake drum, having a radially inward-facing friction surface; brake linings arranged radially inside the friction surface; an actuator for preloading the brake linings against the friction surface; an anchor plate for holding the actuator, having an opening for discharging abraded brake particles from the brake drum; and a cover for the brake drum, wherein the cover delimits a pocket for collecting abraded brake particles.
2. The drum brake as claimed in claim 1, wherein the opening is spaced apart from the base region of the cover.
3. The drum brake as claimed claim 1, wherein the opening opens into a collecting funnel projecting into the pocket.
4. The drum brake as claimed in claim 3, wherein the collecting funnel is arranged between two brake linings and directly above the inner side of the brake drum and has a trough shape for collecting the abraded brake particles.
5. The drum brake as claimed in claim 1, wherein the cover has a vertical section, and the vertical section has a partial region which forms the pocket, and in that the opening is arranged above the vertical section.
6. The drum brake as claimed in claim 1, wherein the anchor plate and the cover are manufactured in one piece.
7. The drum brake as claimed in claim 1, wherein the opening is closed by a plug.
8. The drum brake as claimed in claim 1, wherein the opening has a connection for a suction line.
9. The drum brake as claimed in claim 1, wherein the opening is connected to an air filter.
10. The drum brake as claimed in claim 1, wherein the opening is connected to an intake tract of an internal combustion engine.
11. The drum brake as claimed in claim 1, wherein the pocket has on its upper side a section which slopes relative to the vertical section, and in that the opening is arranged in the sloping section.
12. The drum brake as claimed in claim 1, wherein the opening has a tubular nozzle.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The invention permits numerous embodiments. To further illustrate its basic principle, a number of these embodiments are illustrated in the drawing and will be described in the following text. In the drawing:
[0020] FIG. 1 shows in simplified form a longitudinal section through a drum brake,
[0021] FIG. 2 shows a partial region of a first embodiment of the drum brake from FIG. 1,
[0022] FIG. 3 shows a suction means for connection to the drum brake from FIG. 2,
[0023] FIG. 4 shows a partial region of a second embodiment of the drum brake from FIG. 1,
[0024] FIG. 5 shows a partial region of a third embodiment of the drum brake from FIG. 1,
[0025] FIG. 6 shows a sectional illustration of the embodiment according to FIG. 3 along the line VI-VI.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0026] FIG. 1 shows in simplified form a longitudinal section through a drum brake 1 of a motor vehicle having a rotatably mounted brake drum 2 and a radially inward-facing friction surface 3. Radially inside the friction surface 3, brake linings 4 are situated opposite the brake drum 2. The brake linings 4 are arranged in pairs, as illustrated in FIG. 6. The brake linings 4 are held on an anchor plate 5 and can be pressed against the friction surface 3 by an actuator 6. The anchor plate 5 has a cover 7, which fits over a partial region of the brake drum 2. A pocket 9, in which abraded brake particles collect, is arranged between the brake drum 2 and a vertical section 8 of the cover 7. The anchor plate 5 has an opening 11 in a sloping section 10 arranged above the vertical section 8. The cover 7, which is manufactured in one piece with the anchor plate 5 in the exemplary embodiment under consideration, seals off the pocket 9 from the environment, thus preventing abraded brake particles from being introduced into the environment.
[0027] FIG. 2 shows on an enlarged scale the lower partial region of the drum brake 1 from FIG. 1 in the region of the opening 11. The opening 11 is closed by a plug 12. After removal of the plug 12, a suction means 13 illustrated in FIG. 3 can be introduced through a connection 14 of the opening 11 and can extract the abraded brake particles by suction.
[0028] FIG. 3 shows schematically a suction means 13 for connection to the opening 11 from FIG. 2. The suction means 13 has a suction line 15 for introduction into the opening 11, a fan 16 and an air filter 18. When the suction line 15 is introduced into the opening 11, the free end of the suction line 15 gets as far as the base region of the pocket 9. The abraded brake particles can then be extracted by suction by means of the fan 16 and collected in the air filter 18.
[0029] FIG. 4 shows another embodiment of the lower partial region of the drum brake 1 from FIG. 1 with an opening 111. The opening 111 has a tubular connection 114, on which a suction means 113 is mounted. The suction means 113 leads via a suction line 115 to an intake tract 116 of an internal combustion engine 117 of the motor vehicle. In this case, the suction line 115 is taken as far as the base region of the pocket 9. The abraded brake particles are thereby extracted continuously by suction and collected in an air filter 118 of the internal combustion engine 117. For permanent fixing of the suction line 115, the connection 114 has a tubular nozzle 119. In other respects, the embodiment is configured in the same way as that from FIG. 2.
[0030] FIG. 5 shows another embodiment of the lower partial region of the drum brake 1 from FIG. 1 with an opening 211. As in the embodiment according to FIG. 4, the opening 211 has a tubular connection 214 for a suction means (not illustrated here). The tubular connection 214 has a tubular nozzle 219. A collecting funnel 220 projects into the pocket 9, which is constructed as in the case of the embodiments described above. The collecting funnel 220 projects as far as a location directly in front of the friction surface 3 of the brake drum 2 and has a trough shape for the purpose of collecting the abraded brake particles.
[0031] FIG. 6 shows a sectional illustration through the embodiment according to FIG. 5 along the line VI-VI. Here, it can be seen that the collecting funnel 220 is arranged between two brake linings 4.
