Disc brake device for a vehicle and vehicle with such a disc brake device

Abstract

Disc brake device (4) for a vehicle (1), with a brake disc (6), with brake shoes (10, 11) which can be brought into frictional contact with the brake disc (6), with a brake carrier (8), and with a brake dust collecting device (5) which has a brake dust collecting housing (15) arranged downstream of the brake carrier (8) in a main direction of rotation (14) of the brake disc (6), wherein the brake dust collecting housing (15) is connected to the brake carrier (8), characterized in that a brake dust guide housing (16) with a U-profile-shaped cross-section roofing the brake disc (6) radially outwardly is arranged within the brake dust collecting housing (15), wherein the brake dust guide housing (16) has a flow channel (17) with an inlet (22) and an outlet (26) for an air flow (21) generated by the rotating brake disc (6) and carrying brake dust, towards a filter medium of the brake dust collecting housing (15),and wherein the brake dust guide housing (16) has means inside the same for generating a turbulent air flow (21) in the flow channel (17).,

Description

The invention relates to a disc brake device for a vehicle according to the preamble of claim 1 of the invention. According to claim 10 of the invention, it further relates to a vehicle having such a disc brake device.DE 10 2006 051 972 A1 already discloses a disc brake device for a motor vehicle having a brake disc, having brake shoes which can be brought into frictional contact with the brake disc, having a brake carrier for connecting the disc brake device to a wheel carrier of the vehicle and for mounting a brake caliper, and having a brake dust collecting device. The brake dust collecting device has a first and a second housing part, wherein the second housing part (brake dust collecting housing) is arranged at a distance from the brake carrier when viewed in a main direction of rotation of the brake disc, and the first housing part (brake dust guide housing) assumes the distance between the brake carrier and the second housing part. The housing parts have a predominantly U-profile-shaped cross section and engage over the brake disc from above. The first housing part has at one end, i.e. on the side of the brake carrier, a funnel-shaped inlet region and at the other end, i.e. on the side of the second housing part, an outlet region for an air flow generated by the rotating brake disc and carrying brake dust towards the second housing part. The second housing part comprises at least one brake dust collecting chamber. For guiding the brake dust into the brake dust collecting chamber, the first and second housing parts according to one embodiment have lamellae running along the formed guide channel for the air flow. Moreover, it is provided that the first housing part narrows continuously. These measures are intended to have the effect that the flow speed of the air stream in the first housing part increases and thus the adhesion of brake dust to the first housing part is prevented. In the second housing part, the flow velocity should drop abruptly, so that the brake dust can be deposited therein. In addition, the first housing part has air inlet openings for cooling the brake disc.It is the object of the invention to provide a disk brake device which is alternative with respect to the prior art and which is improved with respect to a safe and efficient transfer of brake abrasion or brake dust into a brake dust collecting device of the disk brake device. It is a further object of the invention to provide a vehicle with such a disc brake device.The invention is based on the finding that, contrary to the prior art (DE 10 2006 051 972 A1), which favors a substantially laminar air flow with a high flow velocity in the flow channel, a turbulent air flow in the flow channel effectively improves the capacity of the generated air flow to absorb brake dust and to guide it securely to the brake dust collecting housing together with the filter medium conventionally located therein.Starting from a disc brake device for a vehicle, with a brake disc, with brake shoes which can be brought into frictional contact with the brake disc, with a brake carrier, and with a brake dust collecting device which has a brake dust collecting housing arranged downstream of the brake carrier as viewed in a main direction of rotation of the brake disc, wherein the brake dust collecting housing is connected to the brake carrier, the stated object is achieved in that a brake dust guide housing having a U-profile-shaped cross section covering the brake disc radially on the outside is arranged within the brake dust collecting housing, wherein the brake dust guide housing forms a flow duct having an inlet and an outlet for an air flow generated by the rotating brake disc and guiding brake dust towards a filter medium of the brake dust collecting housing, and wherein the brake dust guide housing has means inside the same for generating a turbulent air flow in the flow channel.The dependent claims describe preferred refinements or refinements of the invention.According to this, it is preferably provided that the means for generating a turbulent air flow are arranged in the region of the inlet of the flow channel of the brake dust guide housing. The turbulent air flow generated at the beginning continues as far as into the brake dust collecting housing, where entrained brake dust can then easily be filtered out.As the invention further provides, the means for generating a turbulent air flow within the flow channel are formed by projections which extend into the flow channel and can be formed or arranged easily and economically on the brake dust guide housing. Thus, said projections can be attached, for example, to the inner contour of the brake dust guide housing, for example, by adhesive bonding, or can be injection-molded onto the same according to a plastic injection molding method.Preferably, however, the protrusions are integrally formed with the brake dust guide housing, resulting in savings in material, weight and manufacturing time.In this regard, the projections according to a preferred embodiment of the invention are formed from the material of the brake dust guide housing according to a punching-bending method in such a way that, starting from the inner contour of the brake dust guide housing, they are each arranged angled by an angle "α" into the interior of the brake dust guide housing and each leave a through-opening in the brake dust guide housing. Said through-opening has the advantage that external air is sucked into the flow duct from the outside during operation of the vehicle, which external air can likewise contain brake dust and, moreover, assists the formation of turbulence of the air flow.Experiments on the subject matter of the application have shown that an angle "α" of 10° to 90°, preferably 45°, is particularly advantageous.The protrusions may each have a shape formed by two or more cut lines produced by punching and angled into the interior of the brake dust guide housing.Preferably, projections, each having a triangular shape resulting from two cutting lines, are fixedly arranged with one side on the brake dust guide housing in such a way that their free corner pointing into the flow channel is further preferably directed towards the brake carrier. Because said free corner thus points counter to the flow profile of the air flow, the desired turbulences in the air flow can be generated particularly effectively.In order to achieve a maximum air input into the brake dust guide housing enriched with brake dust, according to a further embodiment of the invention, the same can have a funnel-shaped shape in the region of the inlet, narrowing in the direction of the brake dust collecting housing, from which, furthermore, an increased flow speed of the air flow results in the subsequent section of the flow duct due to the decreasing flow cross section.In combination with the above measure or alone, it can furthermore be provided that the brake dust guide housing has a funnel-shaped, widening shape in the region of the outlet of the flow duct. In this case, the outlet is designed in the manner of a fluidic diffuser which reduces the outlet speed to an optimum extent for depositing the brake dust carried along in the air stream in the brake dust collecting housing. Advantageously, the air flow together with the brake dust carried along is guided along the wall of the brake dust collection housing into said filter medium, whereby the degree of separation of the brake dust is further optimized.The invention also relates to a vehicle having a disc brake device of the type described above.The invention is explained in more detail below with reference to the exemplary embodiment schematically illustrated in the drawings. However, it is not limited to this, but covers all the embodiments defined by the patent claims. The following are shown: FIG. 1 is a highly schematic view of a vehicle equipped with a disc brake device according to the invention, FIG. 2 is a top view of the disk brake device according to the invention, showing a wheel carrier on which the disk brake device is mounted, together with a brake dust collecting device of the disk brake device, FIG. 3 is a side view of the disk brake device according to the invention shown in FIG. 2, with a brake dust collecting housing of the brake dust collecting device shown in section, in which housing a brake dust guide housing essential to the invention is arranged, FIG. 4 is a perspective view of the disc brake device according to FIG. 3, but without a brake disc thereof, FIG. 5 is a perspective view of the disc brake device according to FIG. 4, showing the brake dust guide housing essential to the invention in isolation; and FIG. 6 shows a perspective individual illustration of the brake dust guide housing essential to the invention.FIG. 1 initially shows extremely schematically a vehicle 1, in the present case a passenger car, which according to FIGS. 2 and 3 has a wheel-guiding wheel carrier 3 per vehicle wheel 2 with a respective disc brake device 4 together with a brake dust collection device 5 assigned to the same. The disk brake device 4 has, on the one hand, a brake disk 6, which is connected to the relevant vehicle wheel 2 in a rotationally fixed manner by means of a brake disk pot 7 formed or arranged radially on the same. On the other hand, the disc brake device 4 has a brake carrier 8 with a movable brake caliper 9 which engages radially on the outside of the brake disc 6 and with a respective brake shoe 10, 11 with brake pad 12, 13 on both sides of the brake disc 6. By means of a drive, which is formed, for example, by a hydraulically actuated brake piston (not shown in the drawing), the brake shoes 10, 11 or their brake pads 12, 13 can be brought into frictional contact with the brake disc 6 or pressed against the brake disc 6.As is generally known, brake abrasion results from a brake actuation, also referred to as brake dust (not shown in the drawing), which is conventionally released into the environment in a disadvantageous manner by the ventilation effect of the brake disk 6. To address this adverse circumstance, the disc brake device 4 includes the aforementioned brake dust collecting device 5 that receives the brake dust coming off from the brake disc 6 and the brake pads 12, 13. The brake dust collecting device 5 has, as seen in a main direction of rotation 14 of the brake disc 6, a brake dust collecting housing 15 which is arranged downstream of the brake carrier 8 and is connected to the latter. Said main direction of rotation 14 of the brake disk 6 is understood to mean the direction of rotation thereof which is to be drawn when the vehicle 1 is travelling forwards (cf. FIG. 3 ).Inside the brake dust collecting housing 15, a brake dust guide housing 16 is disposed. Both the brake dust collecting housing 15 and the brake dust guide housing 16 have a U-profile-shaped cross section and are placed over the brake disc 6 from the radially outside and thus encompass the same on both sides (cf. in particular. FIG. 4 ).The brake dust guide housing 16 extends at one end as far as close to the brake shoes 10, 11 and at the other end as far as into the brake dust collecting housing 15. The flow channel 17 serves for guiding an air flow 21 running in the direction of rotation of the brake disk 6 from the brake shoes 10, 11 to a brake dust filter medium, not shown in the drawing, arranged within the brake dust collection housing 15, whereby any brake dust that is detached is entrained by the air flow 21 and is guided into the brake dust collection housing 15 and further into said filter medium.As can be seen in particular from FIGS. 3 to 6, the brake dust guide housing 16 has means for generating a turbulent air flow 21. The advantages of such a turbulent air flow 21 have already been described above. In the present case, the means for generating a turbulent air flow 21 are arranged in the region of the inlet 22 of the flow duct 17 arranged on the brake shoe side. However, the invention is not limited to this preferred arrangement, but said means can also be provided at another or additionally at another location of the flow channel 17 (not shown in the drawing).Said means for generating a turbulent air flow 21 within the flow channel 17 are provided merely by way of example on the side walls 18, 19 of the brake dust guide housing 16. Alternatively or in combination with this measure, said means for generating a turbulent air flow 21 can also be provided on the covering wall 20 (not shown in the drawing) connecting the side walls 18, 19 to one another. The means for generating a turbulent air flow 21 are formed in the present case by projections 23, which extend from the inner contour of the brake dust guide housing 16 into the flow channel 17 and thus into the air flow 21.According to an embodiment of the invention which is not illustrated in the drawing, projections 23 which are produced separately and are attached to the inner contour of the brake dust guide housing 16 can be provided and which are attached to the brake dust guide housing 16 by means of adhesive bonding, for example. According to another embodiment of the invention, not shown in the drawing, said projections 23 can also be injection-molded onto the inner contour of the brake dust guide housing 16 by a plastic injection molding method known per se.Alternatively and preferably, however, the projections 23 are formed integrally with the brake dust guide housing 16. FIGS. 3 to 6 thus show a brake dust guide housing 16 with projections 23, which are further preferably formed from the material of the brake dust guide housing 16 by a punching-bending method known per se. Since the brake dust guide housing 16 is preferably made of a metal sheet, alternatively of a preferably heat- and impact-resistant plastic blank, projections 23 produced in this way can be produced easily and cost-effectively by the punching-bending method.The projections 23 are formed from the material of the brake dust guide housing 16 in such a way that, starting from the inner contour of the brake dust guide housing 16, they are each arranged at an angle "α" (cf. FIG. 6 ) into the interior of the brake dust guide housing 16 and thereby leave a through opening 24 in the brake dust guide housing. It has been found to be advantageous from experiments to produce an angle "α" of 10° to 90°, preferably 45°.As far as the through-opening 24 is concerned, this has the substantial advantage that external air is sucked through it into the flow duct 17 from the outside during operation of the vehicle 1, which external air can likewise contain brake dust and, moreover, assists the desired formation of turbulence of the air flow 21.According to this exemplary embodiment, the projections 23 each have a triangular shape, in that they are arranged with one side fixed to the brake dust guide housing 16 and angled into the interior thereof. Such projections can be produced with little effort, since these comprise only two cutting lines produced by said punching. However, the invention is not limited to this preferred shape of the protrusions 23, but covers any other suitable shape, for example also a shape that requires more than two cutting lines.As can be further seen from FIGS. 3 to 6, the projections 23 each having a triangular shape are preferably fixedly arranged with one side on the brake dust guide housing 16 in such a way that their free corner 23a pointing into the flow channel 17 is directed towards the brake carrier 8. Because said free corner 23 athus points counter to the flow profile of the air flow 21, the desired turbulences in the air flow 21 can be generated particularly effectively.In order to achieve a maximum air intake, enriched with brake dust, into the brake dust guide housing 16, the same has a funnel-shaped configuration, which narrows in the direction of the brake dust collecting housing 15, in the region of the inlet 22 of the flow duct 17 arranged on the brake shoe side. The formed inlet funnel 25 furthermore brings about an increased flow velocity of the air stream 21 in the subsequent gate of the flow channel 17 on account of the decreasing flow cross section (cf. in particular. FIG. 6 ).In contrast, the brake dust guide housing 16 has a funnel-shaped configuration in the region of the outlet 26 of the flow channel 17, widening in the direction of the brake dust collecting housing 15. The outlet funnel 27 formed is designed in the manner of a fluidic diffuser which reduces the outlet speed of the air stream 21 to an optimum extent for depositing the brake dust carried along in the air stream 21 in the filter medium of the brake dust collection housing 15 (cf. in particular. FIG. 5 ). In this case, the brake dust is advantageously guided along the wall of the brake dust collection housing 15 toward the filter medium, as a result of which the degree of separation of the brake dust is optimized.List of reference characters1 Vehicle 2 Vehicle wheel 3 Wheel carrier 4 Disc brake device 5 Brake dust collecting device 6 Brake disc 7 Brake disc pot 8 Brake carrier 9 Brake caliper 10 Brake shoe 11 Brake shoe 12 Brake pad 13 Brake pad 14 Main rotational direction 15 Brake dust collecting housing 16 Brake dust guide housing 17 Flow channel 18 Side wall 19 Side wall 20 Cover wall 21 Air flow 22 Inlet 23 Projection 23 a Ecke 24 Through opening 25 Inlet funnel 26 Outlet 27 Outlet funnel "α" Angle

Claims

Disc brake device (4) for a vehicle (1), having a brake disc (6), having brake shoes (10, 11) which can be brought into frictional contact with the brake disc (6), having a brake carrier (8), and having a brake dust collecting device (5) which has a brake dust collecting housing (15) which is arranged downstream of the brake carrier (8) as seen in a main direction of rotation (14) of the brake disc (6), the brake dust collecting housing (15) being connected to the brake carrier (8), characterized in that a brake dust guide housing (16) having a U-profile-shaped cross section which radially outwardly covers the brake disc (6) is arranged within the brake dust collecting housing (15), wherein the brake dust guide housing (16) forms a flow channel (17) with an inlet (22) and an outlet (26) for an air flow (21) generated by the rotating brake disc (6) and guiding brake dust towards a filter medium of the brake dust collector housing (15), and wherein the brake dust guide housing (16) has inside the same means for generating a turbulent air flow (21) in the flow channel (17).Disc brake device (4) according to Claim 1, characterized in that the means for generating a turbulent air flow (21) are arranged in the region of the inlet (22) of the flow duct (17) of the brake dust guide housing (16).Disc brake device (4) according to claim 1 or 2, characterised in that the means for generating a turbulent air flow (21) within the flow channel (17) are formed by projections (23) extending therein.Disc brake device (4) according to Claim 3, characterized in that the projections (23) are formed integrally with the brake dust guide housing (16).Disc brake device (4) according to Claim 4, characterized in that the projections (23) are formed from the material of the brake dust guide housing (16) by a punching-bending method in such a way that, starting from the inner contour of the brake dust guide housing (16), they are each arranged at an angle "α" into the interior of the brake dust guide housing (16) and each leave a through-opening (24) in the brake dust guide housing (16).Disc brake device (4) according to Claim 5, characterized in that the angle "α" is 10° to 90°, preferably 45°.Disc brake device (4) according to claim 5 or 6, characterised in that the projections (23) each have a shape which is formed by two or more cutting lines and is arranged at an angle into the interior of the brake dust guide housing (16).Disc brake device (4) according to Claim 6 or 7, characterized in that the projections (23) each have a triangular shape resulting from two cutting lines in such a way that the projections (23) are fixedly arranged with one side on the brake dust guide housing (16) and their free corner (23a) pointing into the flow duct (17) is directed towards the brake carrier (8).Disc brake device (4) according to one of the preceding claims, characterized in that the brake dust guide housing (16) has a funnel-shaped configuration in the region of the inlet (22) and / or the outlet (26) of the flow duct (17).Vehicle (1) having a disc brake device (4) according to one of the preceding claims.

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