Brake device with a brake disc and a brake dust collecting means

Abstract

A brake device (1) has a brake disc (11) which is mounted rotatably about a rotational axis (2), a brake calliper (17) which engages around an edge of the brake disc (11) and has brake linings (29) which are supported on it and can be pressed against the brake disc (11) for braking purposes, a brake dust collecting means (18) which is adjacent to the brake calliper (17) and has a dust filter (19) through which flow can pass, and a covering hood (15) which covers the brake calliper (17) and the brake dust collecting means (18). The covering hood (15) is shaped as a flow body which lies opposite a mating surface (30), with the formation of a flow duct (22) with a constriction (23), in such a way that at least part (24) of a circulating flow (14), caused by rotation about the rotational axis (2), about the rotational axis (2) passes through the flow duct (22). The constriction (23) is arranged behind the brake linings (29) in a main rotational direction (16) of the rotation about the rotational axis (2), and an extraction opening (20), opening into the flow duct (22) in the region of the constriction (23), in the covering housing (15) is spanned by the dust filter (19) of the brake dust collecting means (18).

Description

[0001] Braking device with a brake disc and a brake dust collection device

[0002] TECHNICAL FIELD OF THE INVENTION

[0003] The invention relates to a braking device with a brake disc and a brake dust collecting device as well as the further features of the preamble of independent patent claim 1.

[0004] Brake dust generated when braking with a disc brake consists of small particles from the brake disc and brake pads that are rubbed off when the brake pads are pressed against the rotating brake disc to decelerate. Brake dust is a fine dust with the potential to be hazardous to health. To prevent this potential health hazard and in view of future particulate matter regulations and emissions standards, which will likely also affect brake dust, the brake dust generated during braking must be collected.

[0005] STATE OF THE ART

[0006] DE 19 643 869 A1 discloses a braking system for a motor vehicle in which the rotational speed of at least one brake disc coupled to the wheels mounted on suspension struts can be reduced by pressing on brake pads attached to brake shoes. To prevent the release of brake dust into the environment and the contamination of wheel rims by brake dust deposits, a suction device is provided, mounted behind the brake shoes in the direction of rotation, for extracting the brake dust generated by abrasion on the brake pads. The suction device is equipped with at least one funnel-shaped dust collector, which has a suction opening adjacent to the brake disc or brake drum at one end and whose other end is connected via a suction line to a collecting container, behind which a vacuum sufficient to extract the brake dust is created.A line connection between the collecting tank and an intake manifold of the vehicle engine can be used to generate the vacuum. Alternatively, a line connection between the collecting tank and a Venturi tube exposed to the airstream can be used to generate the vacuum. The suction device should be controlled so that it operates with reduced suction power when the vehicle engine is decelerated and with full suction power when the brakes are applied. The vacuum present at the beginning of braking is not sufficient to extract the brake dust accumulating at the beginning of braking, even if the suction device is already operating with reduced suction power during a previous deceleration of the vehicle engine.

[0007] DE10 2008 029 504 B4 discloses a brake dust extraction system for vehicles equipped with an ABS system and disc brakes. When the disc brake is applied, a brake pad is pressed against the brake disc by means of a brake caliper. The brake dust extraction system has a suction device that extracts brake dust via several suction lines into a filter system. The brake caliper is completely surrounded by a suction housing, to which the suction lines are connected. The suction device is activated by a control and operation detection device as soon as the ABS system is activated. The suction housing extends beyond the brake caliper in a circular arc around the brake disc. An operation delay system allows the suction device to continue running for a predetermined period of time after the disc brake has been applied.The known brake dust extraction system is not ready for operation quickly enough to extract the brake dust that accumulates when braking begins because the suction device needs a certain amount of time to build up sufficient negative pressure.

[0008] DE 10 2009 021 203 A1 discloses a brake dust collection device for motor vehicles for collecting brake dust from a vehicle wheel brake in a dust collection device. The dust collection device is designed as a filter element that is positioned upstream of the radial outer edge of the brake disc of the vehicle wheel brake, extends over a limited angular section of the brake disc, and at least partially covers a brake disc sidewall. For this purpose, the filter element has a U-shaped cross-section and extends, at least in sections, radially along both brake disc sidewalls. The filter element is positioned downstream of a brake caliper of the vehicle wheel brake in the direction of rotation of the brake disc when the motor vehicle is moving forward. The filter element is housed in a filter housing. The filter housing has flow guide sections facing the brake pad that expand in the radial and / or axial direction.The filter element is preferably designed as a molded part or molded filter whose strength or structure is sufficiently high that the shape of the filter element is maintained even without supporting measures. The known brake dust collection device is said to have the advantage that, in principle, no suction device is required, which would otherwise generate an air flow that would transport the brake dust to a collection container.

[0009] A braking device with the features of the preamble of independent patent claim 1 is known from DE 102019 133 794 A1. A vehicle particulate matter collection device has a suction device in which a vacuum unit provides suction pressure via a suction channel. A separating device serves to separate particulate matter from a brake disc of a vehicle brake. A cover interacts with the brake disc and reduces the escape of particulate matter between the vehicle particulate matter collection device and the brake disc. A brake caliper, a brake pad, and a brake actuator of the brake, on the one hand, and the vehicle particulate matter collection unit, on the other hand, are arranged in the cover. The vehicle particulate matter collection device has an inlet guide via which a boundary layer containing particulate matter or abrasion from the brake disc and / or the brake pad is fed to a suction channel.The suction channel is connected to a suction device. A negative pressure is created in the suction device to induce the flow of the boundary layer containing the fine dust through the suction channel. A filter which allows the air of the brake layer to pass through but removes the fine dust from the air of the boundary layer is integrated into the suction device. The suction device is integrated into a rim of a vehicle wheel. The rim has a rim well with a cylindrical inner surface. Closely adjacent to the inner surface is a flow channel body which does not rotate with the rim, so that the rim well and the inner surface move relative to the flow channel body. A moving boundary layer forms on the rotating inner surface of the rim. A flow channel is formed between the inner surface of the rim and the outer surface of the flow channel body facing the inner surface.The flow channel tapers continuously in the direction of the moving boundary layer. The flow channel has a constriction. As the flow channel tapers to the constriction, the flow in the flow channel is accelerated, resulting in a reduction in the static pressure at the constriction. The suction channel of the suction device opens into the constriction. After removing fine dust, an air stream from the suction device is fed via the suction channel to the boundary layer of the inner surface and exits the vacuum unit in an outer area with the boundary layer. The flow channel body extends significantly toward the rim base. This well-known vehicle fine dust collection device has a complex, multi-part design.

[0010] OBJECT OF THE INVENTION

[0011] The invention is based on the object of providing a braking device with the features of the preamble of independent patent claim 1, which has a simple but highly efficient structure with regard to the collection of brake dust.

[0012] SOLUTION

[0013] The object of the invention is achieved by a braking device having the features of independent claim 1. Preferred embodiments of the braking device according to the invention can be found in the dependent claims. The last dependent claim is directed to a vehicle, in particular a motor vehicle or rail vehicle, with at least one braking device according to the invention.

[0014] DESCRIPTION OF THE INVENTION

[0015] A braking device according to the invention comprises a brake disc mounted for rotation about a rotational axis, a brake caliper encompassing the edge of the brake disc with brake pads supported thereon that can be pressed against the brake disc for braking, a brake dust collection device adjacent to the brake caliper with a dust filter through which air can pass, a cover hood covering the brake caliper and the brake dust collection device, and a flow body which lies opposite a counter surface to form a flow channel with a constriction such that at least part of an annular flow caused by rotation about the rotational axis passes through the flow channel. In the region of the constriction, a suction opening opens into the flow channel. The flow body is the cover hood.The constriction is located behind the brake pads in a main direction of rotation around the axis of rotation; and the suction opening in the cover is spanned by the dust filter of the brake dust collection device.

[0016] The flow body is thus formed by the cover that covers the brake caliper and the brake dust collection device. The suction opening, which opens into the flow channel in the area of ​​the constriction, is accordingly provided in the cover. However, the suction opening in the cover is not completely open towards the brake disc; instead, it is spanned by the dust filter of the brake dust collection device. For an outer contour of the cover, over which the annular flow passing through the flow channel flows, this means that it is not interrupted even by a larger suction opening, because it is continued by the dust filter of the brake dust collection device on the outer contour of the cover.Thus, the extraction opening in the cover, and thus the area over which a negative pressure developing in the flow channel acts on the side of the dust filter facing away from the brake disc, can be comparatively large without disrupting the flow through the flow channel and the generation of negative pressure in the flow channel caused by its constriction. However, if the extraction opening of the cover is itself so small that it does not disrupt the flow through the flow channel and the generation of negative pressure in the flow channel caused by its constriction, the extraction opening can be one of a plurality of extraction openings in the cover, and the plurality of extraction openings in the cover can be spanned by the dust filter within the outer contour of the cover.The comparatively large surface area of ​​the dust filter, over which the negative pressure is applied, ensures its long-term effectiveness, even after it has already captured large quantities of brake dust. The rotation around the axis of rotation, which creates the annular flow, which passes at least partially and ideally completely through the flow channel, is the rotation of all components located near the cover relative to the cover, and thus, in particular, the rotation of the brake disc and each surface area of ​​the mating surface attached to it.

[0017] In the braking device according to the invention, the distance between the constriction of the flow channel and the brake pads in the main direction of rotation is between 10° and 60°, and preferably between 20° and 50°, around the axis of rotation. Depending on the brake caliper length in the circumferential direction around the axis of rotation, this distance is typically between 10% and 100% of the brake caliper length. The constriction is therefore located comparatively far back in the main direction of rotation, especially compared to a constriction that is regularly formed between the brake caliper and a counter surface in a conventional braking device.

[0018] The cover can have further extraction openings spanned by the or another dust filter of the brake dust collection system, which are located upstream and / or downstream of the constriction on the flow channel in the main direction of rotation. Upstream and downstream of the constriction, there is also a negative pressure in the flow channel compared to the interior of the cover, which can be used to suck air contaminated with brake dust through the or another dust filter of the brake dust collection system in order to filter the brake dust out of the air. The extraction openings adjacent to the flow channel upstream of the constriction can be located not only behind the brake caliper, but also in the area of ​​the brake caliper and even in front of it, where they can only be reached by a backflow of the air contaminated with brake dust in the cover.

[0019] The extraction openings in the cover, covered by the dust filter(s), can together comprise 10% to 90% of the surface area of ​​the outer contour of the cover facing the flow channel. Preferably, the proportion of the extraction openings is 50% to 80% of the surface area of ​​the outer contour of the cover facing the flow channel. This means that the extraction openings in the cover make up a very significant portion of the surface area of ​​the outer contour of the cover facing the flow channel.

[0020] For large extraction openings, the surface of the outer contour of the cover facing the flow channel is extended beyond the extraction openings by the dust filter spanning the respective extraction opening. For smaller extraction openings that do not disrupt the flow through the flow channel and the negative pressure generated in the flow channel by its constriction, the dust filter spanning the respective extraction opening can be arranged on the inside of the cover. The extraction openings of the cover can be designed, for example, as relatively large holes in a sheet metal or relatively small pores in a sintered body.

[0021] A filter surface of the dust filter facing the flow channel can be folded to make the available surface of the dust filter particularly large. In a special embodiment of the braking device according to the invention, the filter surface facing the flow channel forms filter pockets running transversely to the main direction of rotation. The openings of these filter pockets, which extend close to the contour of the cover, can be aligned with the suction openings in the cover or directly form the suction openings.

[0022] Even in the last-mentioned embodiment of the braking device, the surface of the outer contour of the cover facing the flow channel should be designed as far as possible so that the portion of the annular flow caused by the rotation about the axis of rotation passing through the flow channel does not break away from this surface over the length of the flow channel. This is a prerequisite for the annular flow overflowing the cover to develop without significant pressure loss. The annular flow caused by the rotation about the axis of rotation is essentially a toroidal flow, but in the area of ​​the cover, and particularly within the narrowing flow channel, it is deformed compared to a pure toroidal shape.

[0023] In principle, the surface of the outer contour of the cover facing the flow channel can form a separation edge at its trailing edge, aligned in the main direction of rotation, for the portion of the annular flow passing through the flow channel. Vortices form at this separation edge. A negative pressure exists in these vortices, which can also be used to extract air laden with fine dust through extraction openings in the cover covered by dust filters. However, this negative pressure can also draw in unfiltered air through a gap between the brake disc and the trailing edge of the cover. Furthermore, the formation of vortices is accompanied by a significant energy loss. This energy loss means increased fuel consumption in a motor vehicle equipped with the braking device according to the invention.

[0024] Preferably, the surface of the outer contour of the cover facing the flow channel runs at its trailing edge aligned in the main direction of rotation at an angle of between 5° and 20°, preferably between 7° and 15°, to an adjacent braking surface of the brake disc, i.e. it is comparatively flat and thus such that the parts of the annular flow converge at the trailing edge of the cover without forming large vortices. This minimizes the suction effect on unfiltered air through the gap between the cover and the brake disc. At its leading edge opposite the main direction of rotation, the surface of the outer contour of the cover facing the flow channel can run away from an adjacent braking surface of the brake disc at an angle of between 7° and 45°, preferably between 10° and 20°. The leading edge can therefore be somewhat blunter than a flat trailing edge.However, the shroud also begins relatively flat to prevent the occurrence of pronounced back pressure at its leading edge. Instead, the flat leading edge ensures that the portion of the annular flow passing through the flow channel is smoothly removed from the adjacent braking surface of the brake disc.

[0025] The flow channel formed by the braking device according to the invention can have a smallest channel width of between 3 mm and 25 mm in the region of the constriction. This smallest channel width is preferably between 5 mm and 15 mm. Alternatively or additionally, a free cross-section of the flow channel up to the constriction can be reduced by 75% to 98%, preferably by 85% to 95%, of its inlet cross-section. The narrowing of the flow channel determines the magnitude of the negative pressure generated in the flow channel. The narrowing of the flow channel can be brought about exclusively by the outer contour of the cover deviating from a toroidal section. Alternatively or additionally, the narrowing of the flow channel can be brought about by the counter surface, which is then arranged in a rotationally fixed manner relative to the cover, deviating from a toroidal section.

[0026] The counter surface, which lies opposite the cover used as the flow body across the flow channel, preferably runs continuously around the axis of rotation, wherein the counter surface has a surface region with a surface normal running at least substantially radially to the axis of rotation. With this surface region, the counter surface limits the annular flow radially outwards. This limitation facilitates the formation of a stable annular flow that is sufficiently strong for the application of the present invention through rotation around the axis of rotation. In addition, the counter surface can have a further surface region with a surface normal running at least substantially parallel to the axis of rotation. The counter surface is preferably rounded between its various surface regions.The constriction of the flow channel can be formed - or several constrictions of the flow channel can be formed - between the cover and one and / or other of the partial regions of the counter surface. Preferably, at least one of the surface regions of the counter surface is arranged rotationally opposite the brake disc. This can be achieved, for example, by the at least one surface region of the counter surface being a surface of a wheel attached to the brake disc, and in particular a rim of such a wheel. The brake disc can be arranged in a rim cup of the rim in such a way that the surface of the rim acting as the counter surface is not only axially opposite the braking surface on one side of the brake disc, but also radially opposite the edge of the brake disc.

[0027] Preferably, the flow channel formed by the braking device according to the invention has a constriction on both sides of the brake disc, in the areas of which at least one suction opening of the cover, spanned by the dust filter or another dust filter, opens into the flow channel. Separate portions of the annular flow can be guided through separate sub-channels of the flow channel on both sides of the brake disc, each of which has one of the constrictions on one side of the brake disc.

[0028] On at least one side of the brake disc, for example the side of the brake disc opposite a wheel rim, at least a partial area of ​​the counter surface can be a surface of a cover element. This cover element can be a cover disc extending circumferentially around the axis of rotation of the wheel and partially covering a rim cup in which the brake disc is arranged. The cover element can be stationary opposite the cover hood. Nevertheless, a portion of the annular flow caused by the rotation about the axis of rotation that is sufficient to generate negative pressure in the flow channel can be guided through the flow channel between the cover hood and the cover element. However, this portion of the annular flow is intensified if the cover element is arranged in a rotationally fixed manner relative to the brake disc and therefore rotates with the brake disc about the axis of rotation.

[0029] A cooling channel of the brake disc, which is formed between two partial discs or rings of the brake disc, can be left uncovered by the cover on the outer circumference of the brake disc over at least 50% of the extent of the brake disc around the wheel's axis of rotation, i.e. not covered. This minimizes any impairment of the cooling of the brake disc due to radial flow through its cooling channel through the cover. In order to keep the coverage of the cooling channel of the brake disc by the cover as small as possible, the cover can be made in two parts, although this is not necessary in the area of ​​the brake caliper, which overlaps the edge of the brake disc anyway. The cover can, however, have a slot behind the brake caliper in the main direction of rotation that is open over the outer circumference of the brake disc, i.e. one that is not covered by a dust filter.This slot in the cover can narrow above the cooling channel in the radial direction away from the axis of rotation, so that the radial flow through this slot also creates a negative pressure adjacent to the cover compared to the interior of the cover, which can be used to extract air through extraction openings in the cover that are covered with dust filters.

[0030] A vehicle according to the invention, which may be any single-, double-, or multi-track motor vehicle or rail vehicle, has at least one wheel and a braking device according to the invention, to whose brake disc the wheel is secured. Particularly if the vehicle is a rail vehicle, the brake disc of the braking device can be arranged at an axial distance from the wheel and then preferably together with the cover and all stationary parts of the braking device arranged therein between two cover elements. However, the braking device according to the invention is not only applicable to vehicles, but can be used anywhere where brake dust from a rotating disc brake needs to be collected.

[0031] Advantageous further developments of the invention emerge from the patent claims, the description and the drawings.

[0032] The advantages of features and combinations of several features mentioned in the description are merely exemplary and can be effective alternatively or cumulatively, without the advantages necessarily having to be achieved by embodiments according to the invention.

[0033] With regard to the disclosure content – ​​not the scope of protection – of the original application documents and the patent, the following applies: Further features can be found in the drawings – in particular the illustrated geometries and the relative dimensions of several components to one another, as well as their relative arrangement and operative connection. The combination of features of different embodiments of the invention or features of different patent claims is also possible, deviating from the chosen references of the patent claims, and is hereby encouraged. This also applies to features that are illustrated in separate drawings or mentioned in their description. These features can also be combined with features of different patent claims.Likewise, features listed in the patent claims may be omitted for further embodiments of the invention, but this does not apply to the independent patent claims of the granted patent.

[0034] The number of features mentioned in the patent claims and the description is to be understood as meaning that exactly this number or a greater number than the stated number is present, without the need for the explicit use of the adverb "at least." Thus, for example, if reference is made to one extraction opening, this is to be understood as meaning that exactly one extraction opening, two extraction openings, or more extraction openings are present. The features mentioned in the patent claims may be supplemented by further features or may be the only features present in the subject matter of the respective patent claim.

[0035] The reference signs contained in the patent claims do not represent a limitation of the scope of the subject-matter protected by the patent claims. They serve solely to make the patent claims easier to understand.

[0036] BRIEF DESCRIPTION OF THE CHARACTERS

[0037] In the following, the invention is further explained and described with reference to preferred embodiments shown in the figures.

[0038] Fig. 1 shows, viewed from the front, a braking device according to the invention for a wheel mounted so as to be rotatable about an axis of rotation, which is shown in vertical section and only schematically.

[0039] Fig. 2 is a view along the rotational axis from the inside of the braking device in a slightly different embodiment than in Fig. 1 and without a cover plate shown in Fig. 1, with only the inner circumference of a rim cup of a wheel rim being shown. Fig. 3 is a developed external view of the braking device in a slightly different embodiment than in Figs. 1 and 2, with a radial view of the rotational axis.

[0040] Fig. 4 is a section extending radially to the axis of rotation through a slot in a cover of a further embodiment of the braking device, which slot connects radially outwardly to a cooling channel in a brake disc of the braking device according to the invention; and

[0041] Fig. 5 is a sectional view of another embodiment of the braking device according to the invention, viewed in the direction corresponding to Fig. 2.

[0042] FIGURE DESCRIPTION

[0043] Fig. 1 shows a braking device 1 for a wheel 4 which is mounted in a pedestal bearing 3 so as to be rotatable about an axis of rotation 2. The pedestal bearing 3 is supported on the body of an associated motor vehicle via links (not shown here) and a spring strut 5 with a suspension spring 6 and an integrated shock absorber 7. The wheel 4 has a rim 8 and a tire 9. The rim 8 forms a rim cup 10. In the rim cup 10, a brake disc 11 of the braking device 1 is mounted in a rotationally fixed manner on a wheel hub 12, to which the rim 8 is screwed via wheel bolts (not shown here) and which can be rotated relative to the pedestal bearing 3 about the axis of rotation 3. In this case, on the side of the brake disc 11 facing away from the rim 8, a cover disc is arranged as a cover element 13 rotating around the axis of rotation 2, which partially closes the rim cup 10 with the brake disc 11 arranged therein.In the rim cup 10, the rim 8 and the brake disc 11, which rotate together around the axis of rotation 2, form an annular flow 14 because the boundary layer of air in the rim cup 10 adjacent to the rim 8 and the brake disc 11 is entrained by the rim 8 and the brake disc 11. The annular flow 14 also forms on the side of the brake disc 11 facing away from the rim 8, even when the cover element 13 is not rotating with the wheel 4 but is stationary, and to a certain extent even when the cover element 13 is not present at all. The annular flow running around the axis of rotation 2 flows towards a cover hood 15 of the braking device 1. The cover hood 15 does not cover components of the braking device 1 that rotate with the brake disc 11.Fig. 2, the viewing direction of which runs along the axis of rotation 2, shows the covering hood 15, which in a main direction of rotation 16 of the wheel 4 (not shown here except for the inner circumference of the rim cup 10 of the rim 8) begins before a brake caliper 17 of the braking device 1 and, in addition to the brake caliper 17, covers a brake dust collection device 18. Brake pads 29 are supported on the brake caliper 17 and can be pressed against the brake disc 11 in opposite axial directions for braking. The brake dust collection device 18 has one or more dust filters 19 through which air can flow. The dust filter or filters 19 here span comparatively large suction openings 20 in the covering hood 15 such that the covering hood 15 has an outer contour 21 which is closed to the outside and extends beyond the suction openings.

[0044] Fig. 3 shows that a flow channel 22 between the outer contour 21 of the cover 15 and a counter surface 30, which is formed on one side of the brake disc 11 by the rim 8 and on the other side of the brake disc 11 by the cover disc 13, narrows in the main direction of rotation 16 of the wheel to a constriction 23 and then widens again. Parts 24 of the annular flow 14 flow through the flow channel 22. As a result of the narrowing of the flow channel 22, the annular flow 14 is accelerated and thus, a Venturi effect creates a negative pressure in the flow channel 22 compared to the interior of the cover 15. The negative pressure is generated particularly efficiently because the annular flow 24 follows the outer contour 21 without flow separation. The cover 21 is aerodynamically shaped precisely for this purpose. The negative pressure in the flow channel 22 is greatest where the velocity of the annular flow 24 is highest, i.e. at the constriction 23.The constriction 23 is therefore arranged behind the brake caliper 17 in the main direction of rotation 16. The negative pressure in the flow channel 22 sucks air through the suction openings 20 in the cover 15, specifically through the dust filter 19, so that brake dust released by actuation of the braking device 1 is collected in the dust filter 19. The brake dust is in particular abrasion from the brake disc 11 and the brake pads 1 acting thereon within the brake caliper 17. Flat leading edges 25 of the cover, which lift the boundary layer from the brake disc 11, are located in front of the brake caliper 17 in the main direction of rotation 16. Trailing edges 26 of the cover 15 taper off flatly so that the annular flow 24 can reapply to the brake disc behind the cover 15 without disruption. A central cooling channel 27 of the brake disc 11 is covered radially outwards by the cover 15 only in the area of ​​the brake calliper 17.In front of and behind the brake caliper 17, the cover has slots 28 that allow the cooling channel 27 to open radially outward. At the front and rear edges of the brake caliper 17, the slots 28 extend radially outward, i.e., away from the rotational axis 2.

[0045] Fig. 4 illustrates that the slots 28 in the cover 15, which extend radially to the rotational axis 2 and connect to the cooling channel 27 in the brake disc 11, narrow radially outward. Thus, a flow through the cooling channel 27, which continues as a flow through the slots 28, creates a vacuum adjacent to the cover 15, which draws air from the interior of the cover 15 through the dust filter 19 spanning the suction openings 20.

[0046] In the embodiment of the braking device 1 shown in Fig. 5, a filter surface 31 of the dust filter 19 is folded so that it forms filter pockets 32 which are arranged transversely to the

[0047] Main direction of rotation 16 and are positioned relative to the annular flow 14. The outwardly directed openings of the filter pockets 32 are the suction openings 20 in the cover hood 15. Unlike shown in Fig. 5, the suction openings 20 are so small that they do not interrupt the outer contour 21 to such an extent that the annular flow 14 in the flow channel 22 is disturbed to such an extent that no usable negative pressure occurs in the flow channel 22.

[0048] The folded filter surface 31 ensures that the area of ​​the dust filters 19 available for loading with collected brake dust is particularly large.

[0049] LIST OF REFERENCE SYMBOLS

[0050] Braking device, rotary axis, pillow block bearing, wheel

[0051] shock absorber

[0052] Support spring

[0053] Shock absorber Rim Tire Rim cup Brake disc Wheel hub

[0054] Cover plate

[0055] Ring flow cover direction of rotation brake calliper brake dust collection device

[0056] dust filter

[0057] Suction opening outer contour flow channel bottleneck

[0058] Part of the annular flow 14 Leading edge Trailing edge Cooling channel

[0059] slot

[0060] Brake pad Counter surface Filter surface Filter bag

Claims

PATENT CLAIMS 1. Braking device (1) with a brake disc (11) mounted so as to be rotatable about a rotational axis (2), a brake calliper (17) which surrounds an edge of the brake disc (11) and has brake pads (29) supported thereon which can be pressed against the brake disc (11) for braking, a brake dust collecting device (18) adjacent to the brake calliper (17) and having a dust filter (19) through which a flow can pass, a cover (15) covering the brake calliper (17) and the brake dust collecting device (18), and a flow body which lies opposite a counter surface (30) to form a flow channel (22) with a constriction (23) in such a way that at least a part (24) of an annular flow (14) around the rotational axis (2) caused by rotation about the rotational axis (2) passes through the flow channel (22), wherein in the region of the constriction (23) a suction opening (20) is provided in the flow channel (22), characterized in that the flow body is the cover (15),wherein the constriction (23) is arranged behind the brake pads (29) in a main direction of rotation (16) about the axis of rotation (2), and wherein the suction opening (20) in the cover (15) is spanned by the dust filter (19) of the brake dust collecting device (18).

2. Braking device (1) according to claim 1, wherein a distance of the constriction (23) to the brake pads (29) in the main direction of rotation (16) is between 10° and 60° and preferably between 20° and 50° around the axis of rotation (2).

3. Braking device (1) according to one of the preceding claims, wherein the cover (15) further with the or a further dust filter (19) of the brake dust collecting device (18) has suction openings (20) spanned over it, which open into the flow channel (22) in front of and / or behind the constriction (23) in the main direction of rotation (16).

4. Braking device (1) according to claim 3, wherein the one or more dust filters (19) spanned extraction openings (20) in the cover (15) 10% to 90%, preferably 50% to 80% of a surface of an outer contour (21) of the cover (15) facing the flow channel (22).

5. Braking device (1) according to claim 3 or 4, wherein a filter surface (31) of the dust filter(s) (19) spanning the suction openings (20) facing the flow channel is folded, wherein filter pockets (32) are optionally formed which extend transversely to the main direction of rotation (16).

6. Braking device (1) according to one of the preceding claims, wherein the or a surface of the or an outer contour (21) of the cover (15) facing the flow channel (22) is designed such that the part (24) of the annular flow (14) caused by the rotation passing through the flow channel (22) does not tear off from the surface over the length of the flow channel (22).

7. Braking device (1) according to claim 5, wherein the surface of the outer contour (21) of the cover (15) facing the flow channel (22) extends at its rear edge (26) running out in the main direction of rotation (16) at an angle of between 5° and 20°, preferably between 7° and 15°, to an adjacent braking surface of the brake disc (11) and / or wherein the surface of the outer contour (21) of the cover (15) facing the flow channel (22) extends at its front edge (25) opposite the main direction of rotation (16) at an angle of between 7° and 45°, preferably between 10° and 20°, away from an adjacent braking surface of the brake disc (11).

8. Braking device (1) according to one of the preceding claims, wherein the flow channel (22) in the region of the constriction (23) has a smallest channel width between 3 mm and 25 mm, preferably between 5 mm and 15 mm, and / or wherein a free cross section of the flow channel (22) up to the constriction (23) is reduced by 75% to 98%, preferably by 85% to 95%.

9. Braking device (1) according to one of the preceding claims, wherein the counter surface (30) continuously rotates around the axis of rotation, wherein the counter surface (30) has a surface area with a surface normal running radially to the axis of rotation (2) and optionally a further surface area with a surface normal running parallel to the axis of rotation (2).

10. Braking device (1) according to one of the preceding claims, wherein at least one surface region of the counter surface (30) is arranged rotationally fixed relative to the brake disc (11).

11. Braking device (1) according to claim 10, wherein the at least one surface region of the counter surface (30) is a surface of a rim (8) of a wheel (4), wherein the brake disc (11) is optionally arranged in a rim cup (10) of the rim (8).

12. Braking device (1) according to one of the preceding claims, wherein the flow channel (22) has a constriction (23) on both sides of the brake disc (11), in the areas of which at least one suction opening (20) of the cover (15), spanned by the or a further dust filter (19), opens into the flow channel (22).

13. Braking device (1) according to one of the preceding claims, wherein at least one surface area of ​​the counter surface is a surface of a cover element (13), wherein the cover element (13) is optionally arranged in a rotationally fixed manner relative to the brake disc (11).

14. Braking device (1) according to one of the preceding claims, wherein the cover (15) does not cover a cooling channel (27) of the brake disc (11) on the outer circumference of the brake disc (11) over at least 50% of the extent of the cover (15) around the axis of rotation (2) of the wheel (4), wherein optionally a slot (18) in the cover (15) extending above the cooling channel (27) narrows in the radial direction away from the axis of rotation (2).

15. Vehicle, in particular a motor vehicle, with at least one wheel (4) and a braking device (1) according to one of the preceding claims, to whose brake disc (11) the wheel (4) is fixed.

Images