Disc brakes for a commercial vehicle

Abstract

A disc brake for a commercial vehicle, comprising a brake caliper (1) overlapping a brake disc (2), a clamping device (4) by means of which a brake pad (3) can be pressed against the brake disc (2) via at least one adjusting spindle (6), and an adjusting device acting on the adjusting spindle (6), which is covered by a sealing cover (9) attached to the outside of the caliper head (7) of the brake caliper (1) and sealed against the caliper head (7), is designed such that a sealing element (13) is arranged on a circumferential edge (17) of the sealing cover (9) and that it rests tightly against an opening wall (18) of the caliper head (7).

Description

[0001] The present invention relates to a disc brake for a commercial vehicle according to the preamble of claim 1.

[0002] Such a disc brake, as is known, for example, from DE 10 2011 018 408 A1, has an adjusting device by means of which a clearance between the brake disc and the brake pads can be adjusted.

[0003] Components of this adjusting device pass through the saddle head of the brake caliper on the outside, on the side facing away from the clamping-side brake pad and towards a brake cylinder, whereby, to protect against mechanical and / or weather influences, these components are covered by a cover which is connected to the brake caliper.

[0004] This can be achieved by positive locking, in particular by screwing, which requires a large number of threaded holes in the brake caliper to ensure a secure hold of the cover on the brake caliper and sufficient contact pressure against a sealing element located between the cover plate and the brake caliper.

[0005] Furthermore, mechanical machining of the brake caliper, which is usually made of cast iron, is required in the area where it overlaps with the cover, resulting in a relatively high overall manufacturing effort, which naturally contradicts the cost minimization that is always sought in the production of a disc brake.

[0006] In any case, thermal stress can cause lid deformations, leading to a reduction in contact pressure, up to and including the complete elimination of the sealing effect.

[0007] To remedy this, the aforementioned DE 10 2011 018 408 A1 proposes to permanently connect the cover to the brake caliper, with the connecting elements being designed as locking elements that engage in locking openings of the brake caliper.

[0008] In DE 10 2012 108 575 A1 a disc brake is disclosed in which a mounting opening of the brake caliper facing a brake disc is closed by a closing plate which is screwed to the brake caliper in one part and is positively locked to the brake caliper in another part.

[0009] To seal the closure lid against the mounting opening, a circumferential sealing cord is provided, which is squeezed when appropriate pressure is applied.

[0010] The invention is based on the objective of further developing a disc brake of the generic type in such a way that it is easier and more cost-effective to manufacture and its service life is improved.

[0011] This problem is solved by a disc brake having the features of claim 1.

[0012] First of all, it should be noted that machining the brake caliper to create a contact area is significantly simpler than with prior art. Only a relatively small area of ​​the opening wall of the caliper head needs to be machined, against which the sealing element, preferably designed as a sealing cord, makes a sealing contact.

[0013] This contact area, i.e. the opening wall aligned parallel to the axis with respect to the brake disc, is preferably formed from a step introduced into the saddle head, the base of which can form a contact for the cover without having to be machined.

[0014] Naturally, such a minimized processing method is significantly cheaper in terms of manufacturing costs than processing the plant areas as required by the state of the art.

[0015] The fact that fewer fasteners, especially screws, are required to attach the cover to the brake caliper also contributes to reducing manufacturing costs. The savings result not only from the reduced number of screws, but also from the correspondingly smaller number of threaded holes required in the brake caliper.

[0016] According to a further aspect of the invention, it is provided that the closure cover is equipped with locking elements known from the prior art, for example from DE 10 2011 018 408 A1, which are positively locked in locking openings of the brake caliper.

[0017] Since the closure lid is usually made of plastic, such locking elements can be molded into the lid during its manufacture.

[0018] As has surprisingly turned out, the closure lid is now more robust against weather influences, especially temperatures, as well as against stone chips and against the ingress of water under high pressure, as used in cleaning work.

[0019] Due to the arrangement of the sealing element according to the invention, the resulting force flow is limited exclusively to the closure lid.

[0020] As mentioned, the sealing element can consist of a sealing cord, which is held, for example, in a circumferential groove in the circumferential edge of the closure lid.

[0021] It is also conceivable to injection mold the sealing element, whereby the cover can be axially pre-tensioned to achieve sufficient contact pressure, so that radial forces are effective in generating the contact pressure when the cover is attached to the brake caliper.

[0022] Further advantageous embodiments of the invention are characterized in the dependent claims.

[0023] Exemplary embodiments of the invention are described below with reference to the accompanying drawings.

[0024] They show: Fig. 1. The schematic structure of a disc brake according to the state of the art in a partially cutaway top view, Fig. 2 a front view of a saddle head of a disc brake according to the invention Fig. 3 a section through a part of the disc brake according to line III - III in Fig. 2 Fig. 4 Another embodiment of the invention in a partial section of the saddle head in a top view.

[0025] In the Fig. Figure 1 shows a disc brake for a commercial vehicle according to the prior art, comprising a brake caliper 1 extending over a brake disc 2, brake pads 3 arranged on both sides of the brake disc 2 and contacting it during braking, and a clamping device 4 with which the clamping-side brake pad 3 can be pressed against the brake disc 2. The clamping pressure is transmitted from the clamping device 4 to the brake pad 3 by two adjusting spindles 6.

[0026] Furthermore, the disc brake has an adjusting device with which a wear-related change in the clearance between the brake pad 3 and the brake disc 2 can be essentially compensated for.

[0027] For synchronous adjustment of the two adjusting spindles 6, a synchronizing device 5 is provided, with a chain drive consisting of two sprockets arranged on the adjusting spindles 6 in a rotationally secure manner and a chain 8 guided thereon.

[0028] The synchronizing device 5, positioned on the outside of a saddle head 7 of the brake caliper 1, which also includes a receptacle 10 for wear detection, for example for a potentiometer, is covered from the environment by a cover 9, which is located in the Fig. 2 is recognizable in a front view.

[0029] In the Fig. Figure 3 shows the arrangement of the closure cover 9 according to the invention on the outside of the saddle head 7 of the brake caliper 1. It can be seen that a sealing element 13 is arranged circumferentially on a circumferential edge 17 of the closure cover 9.

[0030] While the Fig. 3 represents a part of a disc brake with two adjusting spindles 6, according to the Fig. 1, wherein the closure cover 9 represents parallel and spaced-apart protruding bearing points 11, 12 for receiving functional parts of the clamping device 5, shows the Fig. 4 a sealing cover 9 as used in a disc brake with only one adjusting spindle. Such a disc brake is disclosed, for example, in DE 10 2022 101 788 A1.

[0031] This is clearly evident in the Fig.4 to recognize that the sealing element 13 is inserted in a circumferential groove 15 of the edge 17 and, on the other hand, seals tightly against an opening wall 18 of the saddle head 7.

[0032] This opening wall 18 is part of a step 16 of the saddle head 7, at the base of which the closure cover 9 rests.

[0033] To fasten the closure cover 9 to the saddle head 7, locking elements 14 are arranged on the closure cover 9 in the example, which are inserted into corresponding locking openings of the saddle head 7, wherein these locking elements each have several locking legs designed in the sense of a barb, which engage behind the locking opening on the side facing away from the closure cover 9.

[0034] According to another example, or in addition to fastening with the ratchet elements 14, the closure cover 9 is fastened to the saddle head 7 by screws (not shown).

[0035] The sealing element 13 can be designed as a sealing cord and inserted into the groove 15. Alternatively, the sealing element 13 can be directly injection-molded onto the edge 17 of the closure cover 9 during manufacturing, using a more elastic plastic than that used for the closure cover 9. Reference symbol list 1 brake caliper 2 brake discs 3 brake pads 4 Clamping device 5 Synchronization device 6 adjusting spindles 7 Saddle head 8 chain 9 sealing caps 10 recording 11 storage location 12 storage locations 13 Sealing element 14 locking element 15 Nut 16 levels 17 edge 18 Opening wall QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2011 018 408 A1 [0002, 0007, 0016] DE 10 2012 108 575 A1

[0008] DE 10 2022 101 788 A1

[0030]

Claims

[1] Disc brake for a commercial vehicle, comprising a brake caliper (1) overlapping a brake disc (2), a clamping device (4) by means of which a brake pad (3) can be pressed against the brake disc (2) via at least one adjusting spindle (6), and an adjusting device acting on the adjusting spindle (6), which is covered by a sealing cap (9) attached to the outside of the caliper head (7) of the brake caliper (1) and sealed against the caliper head (7), characterized by , that a sealing element (13) is arranged on a circumferential edge (17) of the closure cover (9) and that fits tightly against an opening wall (18) of the saddle head (7). [2] Disc brake according to claim 1, characterized by , that the sealing element (13) consists of a sealing cord. [3] Disc brake according to claim 1 or 2, characterized by , that the sealing cord is held in a circumferential groove (15) of the closure cover (9). [4] Disc brake according to one of the preceding claims, characterized by , that the sealing element (13) is injection-molded onto the closure cover (9). [5] Disc brake according to one of the preceding claims, characterized by , that the sealing element (13) is more elastic than the closure cap (9). [6] Disc brake according to one of the preceding claims, characterized by , that the opening wall (18) of the saddle head (7) runs parallel to the axis of rotation of the brake disc (2). [7] Disc brake according to one of the preceding claims, characterized by , that the opening wall (18) adjoins the base of a step (16). [8] Disc brake according to one of the preceding claims, characterized by , that the closure lid (9) rests on the base of the step (16). [9] Disc brake according to one of the preceding claims, characterized by, that the closure cover (9) has locking elements (14) which are inserted into locking openings of the saddle head (7) and / or the closure cover (9) is screwed to the saddle head (7). [10] Disc brake according to one of the preceding claims, characterized by , that the closure cover (9) is inserted axially pre-tensioned into the saddle head (7).

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