DISC BRAKE

Description

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

[0002] Current environmental regulations and the associated legal framework will impose stricter requirements for the prevention of particulate matter in the future. This makes it necessary to develop technical solutions for disc brakes in commercial vehicles that can minimize brake dust, especially the particulate matter content of brake dust, and ideally prevent its emission.

[0003] The existing technical solutions for this, which primarily focus on the passenger car sector, are largely designed to filter and collect the brake dust from the installation space surrounding the disc brake, with or without the aid of compressed air, preferably with an extraction and separation system. This usually requires limiting the surrounding installation space by installing cover or shielding plates around the wheel brake (see, for example, US 2010 / 0096226 A1).

[0004] From WO 2008 / 083884 A1, the use of such an extraction and separation system is known, which on the one hand has a fine dust filter on the brake disc of a disc brake and on the other hand has a fan, both of which are positioned in a wheel rim, wherein the fine dust filter is held on the rim in a hermetically sealed manner against the environment.

[0005] EP 2 585 730 B1 discloses a generic disc brake with an extraction and separation system, also suitable for use on commercial vehicles. The disc brake has a brake caliper that spans a brake disc and in which brake pads provided with friction linings are arranged, each of which can be pressed with its friction lining on both sides against the friction ring surfaces of the brake disc. Outside the overlap area of ​​the friction linings, the friction rings are covered by a housing that is stationary relative to the brake caliper and connected to a suction device, with a dust removal device provided between the housing and the suction device. This design has proven itself to be successful, but is to be further optimized. For example, the vehicle's environment, primarily the conditions in the wheel housing and inside the rim, can ensure diffuse turbulence of the resulting brake dust through the airflow.Likewise, the cover plates can hardly be designed in such a way that the brake is completely encapsulated. Further encapsulation of the brake could result in corresponding thermal problems in the friction pair.

[0006] From WO 2015 / 199412 A1 a disc brake with an extraction pipe arrangement is known.

[0007] The invention is based on the object of further developing a disc brake of the generic type in such a way that the escape of brake wear into the environment is further prevented using simple design means. This object is achieved by a disc brake having the features of claim 1. Advantageous embodiments and further developments are specified in the subclaims.

[0008] According to claim 1, a disc brake is provided with a brake caliper that spans a brake disc and a frame-like brake carrier that surrounds the brake disc edge. The brake carrier has a pad well on either side of the brake disc, with one of two brake pads provided with a friction lining and a backing plate being inserted into each of the pad wells, and with the brake caliper having an opening above the brake disc through which the brake pads can be inserted into the pad wells, with the brake pads each being able to be pressed with their friction lining against the friction ring surfaces of the brake disc (with the aid of an application device and preferably with a sliding caliper construction), and with an extraction pipe arrangement for extracting abrasion particles generated during braking, which can be connected to a brake dust intake and separation system, provided in particular on the vehicle.The opening of the brake calliper is completely or substantially covered with at least one cover element, in particular with a cover plate fastened to the brake calliper, and the suction pipe arrangement has one or more suction pipes and is designed as a replaceable unit which is fastened to the brake carrier.

[0009] According to the invention, a very high proportion of the wear generated during braking is safely absorbed.

[0010] According to one variant, the extraction pipe arrangement can be attached to the outlet side of the brake carrier, based on the preferred direction of rotation of the brake disc during forward travel. The advantage of this is that the extraction can take place directly on the outlet side of the brake disc. The respective extraction arrangement is also securely and stably connected to the brake carrier and can be replaced as a whole. The connection to the brake carrier also allows for retrofitting of brakes already in the field. All design variants have in common that they are well suited for retrofitting disc brakes in the field, but also for original equipment.

[0011] According to an advantageous embodiment, the suction pipe assembly can be screwed to the brake carrier by means of a fastening screw that passes through a fastening element, in particular a fastening plate, which is connected to one or more of the suction pipes. The brake carrier is thus used for a particularly simple and stable connection of the replaceable suction pipe assembly.

[0012] According to expedient and advantageous variants of this design, it can be provided, for example, that the suction pipe assembly is screwed to an axial side of the brake carrier by means of a fastening screw that passes through a mounting plate, or it can be provided that the suction pipe assembly is screwed to the underside of the brake carrier relative to the brake caliper by means of a fastening screw that passes through a mounting plate. Both locations are very well suited for attaching the suction pipe assembly, with the connection below the brake carrier offering the additional advantage that relatively much space is available in this area for implementing the corresponding connection.

[0013] It may optionally be provided that the suction pipe(s) extending into a gap between the brake carrier and the brake disc is / are further fastened to the brake carrier by means of fastening means such as fastening clips.

[0014] According to an expedient further development, it can preferably be provided that the suction pipe arrangement has an interface for connection to an intake and separation system of a vehicle.

[0015] According to further advantageous developments, the suction pipe arrangement can comprise two or more individual open-ended suction pipes that are joined into a common suction pipe that leads to or has the interface. However, it can also be provided that the suction pipe arrangement comprises at least one circumferentially closed, ring-shaped suction pipe that opens into a further suction pipe connected thereto, which leads to or has the interface.

[0016] According to advantageous variants, it can be provided that the suction pipe arrangement comprises an axially extending suction pipe or an axially extending section of a suction pipe, which engages in an axial gap between the brake caliper and the brake carrier. However, it can also be optionally or alternatively provided that the suction pipe arrangement comprises a radially extending suction pipe or a radially extending section of a suction pipe, which engages in a radial gap between the brake carrier and the brake disc.

[0017] It can then be provided that the suction pipe(s) each have one or more suction openings, which can be formed, for example, by windows in the wall of the pipe or by one or more slots.

[0018] In a particularly simple and retrofittable variant, it is also possible to provide an extraction pipe that is designed as a profile with a slot on one side.

[0019] It should also be mentioned that the suction pipes and other pipe elements, as well as any other elements such as fastening straps or screws or the like, can preferably be made of metal, in particular of steel, so that they are stable and sufficiently heat-resistant for use on the disc brake.

[0020] Further advantageous embodiments of the invention are characterized in the subclaims.

[0021] Embodiments of the invention are described below with reference to the accompanying drawings. Features of these embodiments can also be used individually or jointly in other embodiments of the invention not shown. The invention is not limited to this embodiment, but can also be implemented differently than shown and, in particular, equivalently within the scope of the claims. They show: Fig. 1 shows a first disc brake according to the invention in a perspective view; Fig. 2 in a) a cover plate and a suction pipe arrangement of the disc brake from Fig. 1 in an exploded view, in b) a perspective view of a partial area of ​​a brake carrier with a suction pipe arrangement of the disc brake from Fig. 1 and in c) a perspective view of the suction pipe arrangement from a) and b) and in d) a perspective view of a brake carrier with brake pads inserted therein and with a suction pipe arrangement of the disc brake from Fig. 1 and in e) a perspective view of a brake carrier with brake pads inserted therein and a brake disc and with a suction pipe arrangement of the disc brake from Fig. 1 ; Fig. 3 a second disc brake according to the invention in a perspective view; Fig. 4 a cover plate and a suction pipe arrangement of the disc brake from Fig. 3 in an exploded view; Fig. 5 a third disc brake according to the invention in a perspective view; Fig. 6 a suction pipe arrangement of the disc brake from Fig. 5 in an exploded view;

[0022] In the Fig. 1 , 3 und 5Each of the figures shows a disc brake with a frame-like brake caliper 3 that spans a brake disc 1. This brake caliper 3 is movably, in particular displaceably, arranged on a brake carrier 4, which can be attached to a leg of a vehicle axle (not shown here). Within the scope of the invention, the brake caliper 3 can be designed, for example, as a pivoting caliper, a sliding caliper, or a fixed caliper (without a brake carrier).

[0023] Brake pads 51, 52 are arranged on both sides of the brake disc 1 in the brake caliper 3 and, if applicable, in the brake carrier 4. These brake pads each have a backing plate 511, 521 and a friction lining 512, 522. ( Fig. 2d , Fig. 2e ).

[0024] The brake calliper 3 here has a central opening 6 above the brake disc 1, through which the brake pads 51, 52 can be mounted and removed, in particular in order to replace them when changing the pads.

[0025] This opening 6 is partially, substantially or completely covered, i.e. in the sense of the claims and this description, by more than 30%, in particular more than 50% or more than 95%, with at least one cover element, in particular with a cover plate 7.

[0026] The cover plate 7 is removable to allow the brake pads 51, 52 to be replaced. The cover plate 7 is constructed in one piece here. However, it can also be constructed in multiple pieces. It can have one or more openings for visual inspection and / or ventilation.

[0027] The cover plate 7 can have an elongated, approximately rectangular shape if the shape of the opening 6 is designed accordingly. It can have one or more folded side sections with which it can be clamped into the caliper opening. The cover plate 7 can be attached to the brake caliper 3 in this way, but also additionally or alternatively in another way, for example, by means of screws to a retaining bracket for holding down the brake pads (the retaining bracket is not visible here).

[0028] The brake carrier 4 can be designed on one side or preferably in a frame-like manner. In the latter case, it surrounds the upper edge of the brake disc in a frame-like manner. The brake carrier 4 carries the brake caliper 3. Here, the brake caliper 3 is preferably arranged displaceably on the brake carrier 4. In a frame-like design, the brake carrier 4 can have a pad shaft 41, 42 for the brake pads 51, 52 on both sides of the brake disc ( Fig. 2b , 2d ). These lining shafts 41, 42 are circumferentially delimited by brake carrier horns 411, 412; 421, 422 and downwardly by a strut 413, 423. Support surfaces are formed on the strut 413, 423 and the brake carrier horns 411, 412; 421, 422. The brake carrier 4 can be attached to a vehicle in an axle area. (Fig. 1a, Fig.1b; Fig. 2a , Fig. 2d , Fig. 2e ).

[0029] Here, the brake pads 51, 52 are inserted into the pad recesses 41, 42 on both sides of the brake disc 1 in the brake carrier 4. The brake pads 51, 52 are inserted correspondingly into the pad recesses 41, 42 on both sides of the brake disc 1. ( Fig. 2d , Fig. 2e ).

[0030] The brake disc 1 has a rotational axis D. This is aligned parallel to an X-axis in a Cartesian coordinate system. The friction ring surfaces 2 of the annular brake disc 1, in contrast, extend parallel to or in a Y- / Z-plane. The Y-direction is tangential to the circumferential direction (see Fig. 1 ). The preferred direction of rotation in the circumferential direction (related to forward travel of a vehicle) is designated U.

[0031] The brake pads 51, 52 are generally held directly or indirectly via a spring in the pad shafts 41, 42 of the brake carrier 4 by means of a hold-down bracket which extends across the opening 6 of the brake calliper 3 ( Fig. 2d , Fig. 2e ).

[0032] During braking, the brake pads 51, 52 are each pressed against friction ring surfaces 2 with their friction lining 512, 522 on both sides. ( Fig. 1 )the preferably internally ventilated brake disc 1. For this purpose, an actuator (not shown here) is assigned to the disc brake. This can be an electric motor or a pneumatic or hydraulic and / or a spring actuator. This actuator can act on one or both friction linings 51, 52 via an application mechanism - here inside the brake caliper 3 - in order to press them against the brake disc 1. In the case of a sliding caliper brake, for example, one of the two brake pads 51, 52 is pressed against the brake disc 1, while the other of the two brake pads 51, 52 is pulled, e.g. with the brake caliper 3, against the other side of the brake disc 1. The application mechanism further comprises an adjusting device for adjusting the air play, which changes during operation as a result of pad and disc wear.

[0033] During braking, the clearance between the brake pads 51, 52 and the brake disc 1 is overcome. As a result of the resulting friction, wear occurs on the friction pads 51, 52 and also on the brake disc 1 during braking.

[0034] This abrasion is extracted. This disc brake also meets environmental protection requirements with regard to abrasion.

[0035] The cover plate 7 simply prevents the abrasion debris, which is thrown outward as a result of the rotation of the brake disc 1, from penetrating unhindered through the opening 6. Rather, it is essentially thrown along this cover plate in the circumferential direction.

[0036] However, since the vehicle's environment, particularly the conditions in the wheel housing and inside the rim, causes the resulting brake dust to disperse due to the wind, further measures are taken to minimize the abrasion that enters the environment. Furthermore, the cover plates 7 can hardly be designed in such a way that the brake is completely encapsulated. Encapsulating the disc brake could therefore easily lead to thermal problems in the friction pairing.

[0037] In addition, the vehicle equipped with disc brakes is provided with at least one extraction and separation system (not shown here). This system may include a suction fan or similar device (not shown here) that directs the dust particles to a dust extraction device. This device may have one or more separation and / or filter stages. The escaping dust-free air can be released into the environment, for example, via a silencer downstream of the suction fan. The dust particles are collected and disposed of separately.

[0038] The extraction and separation system outside the vehicle's disc brake can be designed or used for one or more of the vehicle's disc brakes. For example, see EP 2 585 730 B1, which discloses components of such a system.

[0039] The collection of the abrasion directly at the point of origin, i.e. at the individual disc brake, is carried out by means of a replaceable suction pipe arrangement 100, 110, 120 integrated into the disc brake, which is designed to collect the abrasion directly near the contact surface between the brake disc 1 and the respective friction lining 511, 521 ( Fig.1 , 3 , 5 ).

[0040] The suction pipe arrangement 100 is designed in such a way that it extends both into a substantially axially extending gap S0 between the brake calliper 3 and the brake carrier 4 and into the two gaps S1, S2 between the brake disc 1 and the brake carrier 4 on both sides of the brake disc 1. The resulting brake dust can then be extracted and collected by means of a vehicle-side extraction and separation system with an extraction fan that can be connected to the suction pipe arrangement 100 of the disc brake.

[0041] This creates a disc brake with an exhaust pipe arrangement 100, 110, 120, which forms a unit from the intake points to the exhaust and separation system. In the example shown, the Fig. 1 Two suction pipes 101, 102, which can be connected by means of a T-piece 102, are placed in the respective axial gap S0 between the brake carrier 4 and the brake calliper 3 and in the respective corresponding gap S1, S2 between the brake carrier 4 and the brake disc friction surface 2, 2, so that their free end dips or protrudes radially or essentially radially into the gap S1, S2.

[0042] The suction pipes 101a, 101b, 111, 121 can be attached directly to the brake carrier 4, e.g. by means of fastening means such as fastening clips 1011, 1021.

[0043] The suction pipes 101a, 101b, 111, 121 of the suction pipe arrangements 100, 110, 120 can have one or more suction openings 1022 ( Fig. 4 , visible at 102a, analogously provided but not visible at 101a and / or 101b, 102b and in the further embodiments). The suction openings 1022 can be distributed directly on the outer circumference of the suction pipe arrangements 100, 110, 120, so that air and particles sucked in by the suction and separation system are first sucked through the suction openings 1022 into the suction pipe arrangements 100, 110, 120 (see in particular Fig. 4 ). In Fig. 4 The intake openings 1022 are clearly visible. The intake openings in an opposite section of the suction pipe 111 are not visible here. The intake openings 1022 can be oriented toward the brake disc 1 in the assembled state. However, they can also be oriented in a different direction.

[0044] Two of the suction pipes 101, 102 can be connected as shown in Fig. 1 and 2a - e As shown, they each form a kind of L-shaped piece. Their cross-section can be chosen largely arbitrarily, e.g., round or square.

[0045] A first leg 101a, 102a of the respective suction pipes 101, 102 can run approximately between one of the brake carrier horns 411, 412; 421, 422 and the brake disc 1 in a radial gap S1, S2 and preferably extend somewhat radially beyond the radial outer circumference of the brake disc 1 (see additional Fig. 2b , Fig. 2d sowie Fig. 2e )

[0046] A second leg 101b, 102b of the respective suction pipes 101, 102, each aligned at a right angle thereto, can then extend in the axial gap S0 between the brake caliper 3 and the brake carrier 4. The ends of these two legs 101b, 102b directed toward each other can then be connected to opposite ends of a T-piece 103, for example, by engaging therein.

[0047] This unit (consisting of the two suction pipes 101, 102 and the T-piece 103) can in turn be connected to a connecting pipe / connecting pipe 105 via an intermediate element such as an L-piece 104.

[0048] The connecting pipe / connecting pipe 105 belonging to the extraction pipe arrangement 100 or unit can then form or comprise the interface to the extraction and separation system. It should be noted that this interface can be designed in any desired manner. For example, it can be implemented as a commercially available hose connection (e.g., plug-in connections, couplings, etc.).

[0049] The complete unit or the suction pipe arrangement 100, 110, 120 can be screwed to the brake carrier 4, for example, by means of a fastening such as a tab 106, e.g. with a screw 107, so that on the one hand it is securely fastened but on the other hand it can be easily replaced.

[0050] The function of this arrangement is as follows: During braking, the brake dust or abrasion is passed on via the cover plate 4 in the circumferential direction in the direction of the suction pipe arrangement 100.

[0051] Due to the direction of rotation U of the brake disc 1, which corresponds to the direction of rotation in the forward direction, the abrasion or brake dust generated during braking is inevitably directed in the direction of the suction pipe arrangement 100.

[0052] This is therefore preferably arranged in the circumferential direction on the outlet side of the brake disc 1 on the brake carrier 4 (again related to a forward travel of a vehicle).

[0053] With regard to the geometric design and connection to the overall system, further design variants are described below.

[0054] The design variant according to Fig. 3 , 4 is characterized by a suction pipe 111 that is closed to a circumferentially closed circuit. The two Fig. 2a The individually provided L-shaped suction pipes 101, 102 are thus connected to one another at their ends - here via a U-shaped region 108, which extends from a radially inner region via bends radially outwards again - with the radially outermost region lying radially outside the largest outer circumference of the brake disc 1. In this way, compared to the embodiment of the Fig. 1 the area in which brake dust can be sucked in is extended.

[0055] Another advantageous feature of this variant of the Fig. 3 und 4The advantage of this design, which was implemented in the present invention but can also be used in other variants, is that the complete suction pipe arrangement 110 is connected, here screwed, to the brake carrier 4 below the brake carrier 4 (relative to the brake caliper 3) with a carrier plate 122. This is particularly advantageous in view of the limited installation space in the area of ​​the disc brake.

[0056] The design variant according to Fig. 5 und 6shows an extraction pipe arrangement 120 with a single extraction pipe 101, which can be designed as a slotted O-profile and which is installed essentially axially between the brake carrier 4 and the brake caliper 3 and is screwed to the brake carrier 4 with a welded support plate 122. Radial pipe sections in the gaps between the brake carrier 4 and the brake disc 1 are virtually non-existent in this particularly simple-acting extraction pipe arrangement 120. The slot 123 serves as the intake opening in this exemplary embodiment. Other intake openings could also be provided. A particular advantage of this variant is that no intake pipe needs to be arranged in the confined space between the brake disc 1 and the brake carrier 4. Bezugszeichenliste

[0057] Brake disc1 Friction ring surfaces2 Brake caliper3 Brake carrier4 Pad shafts41, 42 Brake carrier horns411, 412; 421, 422 Strut413, 423 Brake pads51, 52 Back plate511, 521 Friction lining512, 522 Opening6 Cover7 Suction pipe arrangement 100 Suction pipes 101, 102 First leg 101a, 102a Second leg 101b, 102b T-piece 103 L-piece 104 Connecting pipe 105 Tab 106 Screw 107 Neck 108 Fastening clip 1011, 1021 Suction openings 1022 Suction pipe arrangement110 Suction pipe111 Suction pipe arrangement120 Suction pipe121 Support plate122 Slot123 Gap S0, S1, S2

Claims

1. Disc brake, having - a brake caliper (3) which engages over a brake disc (1) and b. a frame-like brake carrier (4) which engages around a brake disk edge of the brake disc (1) and has lining shafts on both sides of the brake disk (1), into each of which lining shafts brake linings (51, 52) are inserted, which each have a friction lining (512, 522) and a rear plate (511, 521), c. wherein the brake caliper (3) has an opening (6) above the brake disk (1), through which opening the brake linings (51, 52) can be inserted into the lining shafts, d. wherein the brake linings (51, 52) can each be pressed with their friction lining (512, 522) onto friction ring surfaces (2) of the brake disk (1), e. and a suction pipe arrangement (100, 110, 120) for suctioning abraded particles produced during braking, characterized in that f. the opening (6) is covered partially, substantially or completely by at least one cover element, in particular by a cover sheet (7) fastened to the brake caliper (4), g. the suction pipe arrangement (100, 110, 120) comprises one or more suction pipes (101, 102, 111, 121) and is configured as a replaceable unit that is fastened to the brake carrier (4).

2. Disc brake according to claim 1, characterized in that the suction pipe arrangement (100, 110,120) is fastened to the brake carrier (4) on the outlet side, relative to a preferred direction of rotation of the brake disc (1).

3. Disc brake according to claim 1 or 2, characterized in that the suction pipe arrangement (100, 110, 120) is screwed to the brake carrier (4) by means of a fastening screw (107), which passes through a fastening element, in particular a fastening plate (106), which is connected to one or more of the suction pipes (101, 102, 111, 121).

4. Disc brake according to claim 3, characterized in that the suction pipe arrangement (100, 110, 120) is screwed onto an axial side of the brake carrier (4).

5. Disc brake according to claim 3, characterized in that the suction pipe arrangement (100, 110, 120) is screwed to the underside of the brake carrier (4) relative to the brake caliper (3).

6. Disc brake according to any one of the preceding claims, characterized in that the suction pipe or suction pipes (101, 102, 111, 121) of the suction pipe arrangement (100, 110, 120) are also fastened to the brake carrier (4) by means of fastening elements such as fastening clips (1011, 1021).

7. Disc brake according to any one of the preceding claims, characterized in that the suction pipe arrangement (100, 110, 120) has an intersection point to which a suction and separation system of a vehicle can be connected.

8. Disc brake according to any one of the preceding claims, characterized in that the suction pipe arrangement (100, 110, 120) has two or more individual suction pipes (101, 102, 121) which are open at one end and are brought together in a common suction pipe on which the intersection point is formed.

9. Disc brake according to any one of the preceding claims, characterized in that the suction pipe arrangement (100, 110, 120) has at least one circumferentially closed ringshaped suction pipe (101, 102), which opens into a further suction pipe (105) on which the intersection point is formed.

10. Disc brake according to any one of the preceding claims, characterized in that the suction pipe arrangement (100, 110, 120) has an axially extending suction pipe or an axially extending section of a suction pipe, which engages in an axial gap (S0) between the brake caliper (3) and the brake carrier (4).

11. Disc brake according to any one of the preceding claims, characterized in that the suction pipe arrangement (100, 110, 120) has at least two radially extending suction pipes (101, 102, 111, 121), which each engage in a radial gap (S1, S2) between the brake carrier (4) and the brake disc (1) on both sides of the brake disc (1).

12. Disc brake according to any one of the preceding claims, characterized in that the suction pipe or suction pipes (101, 102, 111, 121) each have one or more suction openings (1022).

13. Disc brake according to any one of the preceding claims, characterized in that the suction pipe arrangement (100, 110, 120) has a suction pipe (121) which is configured as a profile slotted on one side.