Device for collecting brake dust

Abstract

The invention relates to a device (10) for collecting brake dust from a disc brake (102), comprising a particle receiving device (12) for receiving brake particles (BP) generated by friction between a brake pad (110) and a brake disc (108) of the disc brake (102), and one or more flow disturbance bodies (14, 14a, 14b) which are designed to be surrounded by a particle flow (PS) comprising brake particles (BP) and to generate flow vortices (W, WR, WL) in the particle flow (PS), which convert a laminar particle flow (LPS) flowing along the brake disc (108) into a turbulent particle flow (TPS).

Description

[0001] The invention relates to a device for collecting brake dust from a disc brake, comprising a particle collection device for collecting brake particles generated by friction between a brake pad and a brake disc of the disc brake, and one or more flow disruptors, which are arranged to be surrounded by a particle flow comprising brake particles and to generate flow vortices in the particle flow, which transform a laminar particle flow flowing along the brake disc into a turbulent particle flow.

[0002] Furthermore, the invention relates to a braking system for a vehicle, comprising a disc brake and a device for collecting brake dust from the disc brake.

[0003] Furthermore, the invention relates to a method for collecting brake dust from a disc brake using a brake dust collection device, comprising the steps of: collecting brake particles generated by friction between a brake pad and a brake disc of the disc brake using a particle collection device and generating flow vortices in a particle flow comprising brake particles by means of one or more flow disruptors which are surrounded by the particle flow, wherein the generated flow vortices transform a laminar particle flow flowing along the brake disc into a turbulent particle flow.

[0004] The brake particles generated during braking typically remain for an extended period in a laminar particle flow that develops in the immediate vicinity of the brake disc, flowing essentially parallel to the disc. Due to the flow direction of this laminar particle flow parallel to the brake disc, a significant proportion of the brake particles cannot be reliably directed to a particle collection device located axially away from the brake disc.

[0005] The object underlying the invention is therefore to disrupt the laminar particle flow parallel to the brake disc in such a way that the particle input into the particle receiving device axially spaced from the brake disc is increased.

[0006] The problem is solved by a device of the type mentioned above, wherein one or more flow disruptors of the device according to the invention are arranged to generate flow vortices with different directions of rotation in the particle flow.

[0007] The transformation of the laminar particle flow along the brake disc into a turbulent particle flow with left-handed and right-handed vortices leads to an increase in particle input into the particle collection device, which is axially spaced from the brake disc. The vortices with different directions of rotation are generated without changing the flow direction towards the one or more flow deflectors. The one or more flow deflectors can be arranged on an air guide element, particularly at the lower end of an air guide element, such as an air guide vane. The air guide element can direct the particle flow towards the particle collection device. Alternatively, the one or more flow deflectors can be attached to a retaining contour.When using a low-profile housing, one or more flow disruptors can also be attached to the housing top. The one or more flow disruptors are preferably arranged in the immediate vicinity of the brake disc in order to influence the particle flow and at least partially disrupt the laminar particle flow.

[0008] In a preferred embodiment of the device according to the invention, several flow-disrupting elements arranged along a linear path form a line of disruptors. The linear path can be straight or curved. The flow-disrupting elements of a line of disruptors can have identical shapes and / or identical heights and / or identical widths. The flow-disrupting elements of a line of disruptors can be equidistant from one another. The flow-disrupting elements of a line of disruptors can have different shapes and / or different heights and / or different widths. The flow-disrupting elements of a line of disruptors can have different distances from one another.

[0009] In a preferred embodiment, the device according to the invention has several rows of flow disruptors, wherein the flow disruptors of the rows are arranged along spaced-apart paths. The rows of flow disruptors can extend radially. The rows of flow disruptors can be identical with respect to the number and / or spacing and / or shape, in particular the size and / or height, of the flow disruptors. The rows of flow disruptors can differ from one another with respect to the number and / or spacing and / or shape, in particular the size and / or height, of the flow disruptors.

[0010] In a further preferred embodiment of the device according to the invention, two adjacent flow disruptors each form a disruptor assembly, which is configured to generate at least two adjacent flow vortices with different directions of rotation in the particle flow. A first flow disruptor of the disruptor assembly is preferably configured to generate a counterclockwise flow vortex. A second flow disruptor of the disruptor assembly is preferably configured to generate a clockwise flow vortex. Further or stronger turbulence can be generated between the flow vortices with different directions of rotation by nozzle and diffuser effects.

[0011] Furthermore, a device according to the invention is preferred in which the flow disruptors of the disruptor assembly have different orientations. The flow disruptors of the disruptor assembly can be designed as sheet metal tongues. The disruptors of the disruptor assembly are preferably oriented in opposite directions and / or form a vortex generator. The flow disruptors of the disruptor assembly are preferably mirror-symmetrical with respect to the direction of the particle flow.

[0012] In another preferred embodiment of the device according to the invention, the baffle arrangement is designed such that the at least two generated, co-flowing vortices with different directions of rotation have vortex axes which run substantially parallel to the brake disc. "Substantially parallel" is understood to mean that the vortex axis forms an angle of less than 10° with the brake disc. It is also understood that the axis of a baffle is not always oriented in a constant direction over time, but can oscillate within tolerance limits. The vortex axes of the two baffles can run parallel to each other. The vortex axes can be aligned with or parallel to the flow direction of the baffle. The vortex axes can run tangentially. The vortex axes can run radially.

[0013] In another preferred embodiment of the device according to the invention, the one or more flow baffles are configured to generate successive flow baffles with alternating directions of rotation in the particle flow. A vortex ring preferably forms behind the one or more flow baffles, which are initially subjected to laminar and turbulence-free flow. This vortex ring is initially still laminarly flowed around by the outer particle flow. The vortex ring grows until it eventually becomes unstable and periodic shedding occurs. Alternating left- and right-rotating flow vortices detach in a characteristic pattern. Consequently, counter-rotating flow vortices are generated by the successive flow vortices with alternating directions of rotation. The one or more flow baffles are thus configured to generate a Karman vortex street.

[0014] The device according to the invention is further advantageously developed in that the one or more flow disruptors generating successive flow vortices with alternating directions of rotation are designed such that the successive flow vortices with alternating directions of rotation have parallel and / or migrating vortex axes. If several flow disruptors generate successive flow vortices with alternating directions of rotation, the flow vortices generated by the flow disruptors can have identical and / or differing vortex properties. For example, the flow vortices can differ from one another with respect to the vortex trail size and / or the rotational speed, or they can be identical with respect to these vortex properties.

[0015] In a further preferred embodiment of the device according to the invention, the flow disruptors have a round or oval cross-section. Alternatively, the flow disruptors can have a polygonal, in particular a rectangular, square, or trapezoidal cross-section. The flow disruptors of a series and / or the flow disruptors of an arrangement can have different or identical cross-sections.

[0016] Furthermore, a device according to the invention is preferred in which the particle collection device is designed as a particle filter or includes a particle filter. The particle filter can comprise metal fibers or be designed as metal wool. If the particle collection device is designed as a particle filter, the brake particles are directly collected by the particle filter and remain in the particle filter. The particle filter can be replaceable.

[0017] Furthermore, a device according to the invention is preferred in which the particle collection device is designed as a particle removal system or comprises an air removal system. If the particle collection device is designed as a particle removal system, the particle removal system can comprise a particle inlet and a particle removal line. The particle inlet can be formed by a collection hood. If the particle collection device comprises an air removal system, a particle filter can be located upstream, downstream, or within the air removal system. The air removal system can comprise an air inlet and an air removal line. The air inlet can be formed by a collection hood.

[0018] In a preferred embodiment, the device according to the invention comprises a driveable flow generator, which is configured to generate a particle removal flow or an air removal flow in the area of ​​the particle collection device. The flow generator can be a blower. The generated particle removal flow conveys the brake particles through the particle removal system. The generated air removal flow conveys brake particle-free air and / or air laden with brake particles through the air removal system.

[0019] The problem underlying the invention is further solved by a braking system of the type mentioned above, wherein the device for collecting brake dust is designed according to one of the embodiments described above. With regard to the advantages and modifications of the braking system according to the invention, reference is therefore made to the advantages and modifications of the device according to the invention.

[0020] The disc brake preferably comprises a brake disc and a brake pad with brake lining.

[0021] The problem underlying the invention is further solved by a method of the type mentioned at the outset, wherein the flow vortices generated within the framework of the method according to the invention have different directions of rotation. In the method for collecting brake dust, a device for collecting brake dust according to one of the embodiments described above is preferably used. With regard to the advantages and modifications of the method according to the invention, reference is therefore first made to the advantages and modifications of the device according to the invention.

[0022] In a preferred embodiment of the method according to the invention, two flow disruptors arranged side by side each form a disruptor assembly which generates at least two adjacent flow vortices with opposite directions of rotation in the particle flow. A first flow disruptor of the disruptor assembly preferably generates a left-handed flow vortex. A second flow disruptor of the disruptor assembly preferably generates a right-handed flow vortex.

[0023] In a further preferred embodiment of the method according to the invention, one or more flow disruptors generate successive flow vortices with alternating directions of rotation in the particle flow. Preferably, alternating left- and right-rotating flow vortices detach from the one or more flow disruptors. The successive flow vortices with alternating directions of rotation thus generate counter-rotating flow vortices. The one or more flow disruptors therefore generate a Karman vortex street.

[0024] Preferred embodiments of the invention are explained and described in more detail below with reference to the accompanying drawings. These show: Fig. 1 a braking system according to the invention in a schematic representation; Fig. 2 a further braking system according to the invention in a schematic representation; Fig. 3 a further braking system according to the invention in a schematic representation; Fig. 4 a row of interfering bodies of a device according to the invention for collecting brake dust in a top view; Fig. 5 another braking system according to the invention in a schematic representation; Fig. 6 a row of interfering bodies of a device according to the invention for collecting brake dust in a top view; Fig. 7 a row of interfering bodies of a device according to the invention for collecting brake dust in a top view; and Fig. 8 another braking system according to the invention in a schematic representation.

[0025] The Fig. Figure 1 shows a braking system 100 for a vehicle. The braking system 100 comprises a disc brake 102 with a brake carrier 104 and a brake caliper 106. The disc brake 102 further comprises a brake disc 108 and a brake pad 110. During a braking process, brake particles are generated by friction between the brake pad 110 and the brake disc 108 of the brake disc 102.

[0026] The braking system 100 further comprises a device 10 for collecting brake particles generated during braking. The device 10 includes a particle collection unit 12 for collecting the brake particles generated during a braking process. The device 10 also includes several flow disruptors 14, which are configured to be surrounded by a flow of brake particles and to generate flow vortices in the particle flow, transforming a laminar particle flow along the brake disc 108 into a turbulent particle flow. The particle collection unit 12 is designed as a particle filter, wherein the particle filter may, for example, comprise metal fibers or be designed as metal wool.

[0027] The Fig. Figure 2 shows the brake particles BP generated by friction between a brake pad 110 and a brake disc 108 of a disc brake 102. The brake particles BP are part of a particle flow PS.

[0028] The brake system 100 comprises a device 10 for collecting brake dust. The device 10 includes several flow baffles 14, which are configured to be surrounded by the particle flow PS containing the brake particles BP and to generate flow vortices W in the particle flow PS. These vortices transform a laminar particle flow LPS flowing along the brake disc 108 into a turbulent particle flow TPS. The flow baffles 14 are configured to generate flow vortices W with different directions of rotation in the particle flow PS. The transformation of the laminar particle flow LPS flowing along the brake disc 108 into a turbulent particle flow TPS with left- and right-rotating flow vortices W leads to an increase in the particle input into a particle collection device 12 located axially spaced from the brake disc 108.In the illustrated embodiment, the particle collection device 12 is designed as a particle filter. The direction of flow of the particle flow PS is determined by the direction of movement BRB of the brake disc 108. Within the laminar particle flow LPS, a velocity distribution GV is formed, according to which the flow velocity increases with decreasing axial distance to the brake disc 108.

[0029] The particle collection device 12, designed as a particle filter, runs parallel to the brake disc 108 and is attached to a housing 24 of the device 10.

[0030] The Fig. Figure 3 shows a brake system 100 in which the flow disruptors 14a, 14b of the device 10 for collecting brake dust are arranged on air guide elements 18. The flow disruptors 14a, 14b are arranged at a lower end of the air guide elements 18, which are designed as air guide vanes. The air guide elements 18, designed as air guide vanes, direct the particle flow PS towards the particle collection device 12.

[0031] The flow disruptors 14a, 14b arranged on the air guide elements 18 each form a disruptor assembly 16, which is configured to generate two adjacent flow vortices WR, WL with opposite directions of rotation in the particle flow PS. Flow disruptor 14a of the disruptor assembly 16 is configured to generate counterclockwise flow vortices WR in the direction of flow. Flow disruptor 14b of the disruptor assembly 16 is configured to generate clockwise flow vortices WL in the direction of flow. The flow disruptors 14a, 14b of the disruptor assemblies 16 have opposite orientations. The flow disruptors 14a, 14b of the disruptor assemblies 16 are oriented in opposite directions and form a vortex generator. The flow disturbance bodies 14a, 14b of the disturbance body arrangements 60 are designed to be mirror-symmetrical with respect to the flow direction of the particle flow PS.

[0032] The vortex axes WA of the adjacent flowing vortices WR, WL run parallel to each other and parallel to the brake disc 108.

[0033] The Fig. Figure 4 shows an air guide element 18 of a device 10 for collecting brake dust, wherein several flow disruptors 14a, 14b are arranged on the air guide element 18. The flow disruptors 14a, 14b are arranged along a linear path 22 and form a row of disruptors 20. The linear path 22 is straight. The flow disruptors 14a, 14b of the row of disruptors 20 have identical shapes. Two flow disruptors 14a, 14b each form a disruptor assembly 16, wherein the disruptor assemblies 16 are configured to generate two parallel flow vortices WR, WL with opposite directions of rotation in the particle flow PS.

[0034] The Fig. Figure 5 shows a braking system 100 in which the flow baffles 14 of the device 10 are configured to generate successive flow vortices WR, WL with alternating directions of rotation in the particle flow PS. A vortex ring initially forms behind the flow baffles 14, which are initially subjected to laminar and vortex-free flow. This vortex ring is initially still laminarly flowed by the outer particle flow. The vortex ring grows until it eventually becomes unstable and periodic shedding occurs. Left- and right-rotating flow vortices WR, WL are shed alternately in a characteristic pattern. The successive flow vortices WR, WL with alternating directions of rotation generate counter-rotating flow vortices WR, WL. Each flow baffle 14 thus contributes to the generation of a Karman vortex street.

[0035] The multiple flow disruptors 14, which generate successive flow vortices WR, WL with alternating directions of rotation, are designed such that the successive flow vortices WR, WL with alternating directions of rotation have parallel and migrating vortex axes WA. The vortex axes WA of the successive flow vortices WR, WL with alternating directions of rotation run essentially perpendicular to the brake disc 108.

[0036] The Fig. Figure 6 shows that the flow disturbance bodies 14 of a row of disturbance bodies 20 extending along a row path 22 can have a circular cross-section.

[0037] The Fig. Figure 7 shows that the flow disturbance bodies 14 of a row of disturbance bodies 20 extending along a row path 22 can have a square cross-section.

[0038] The Fig.Figure 8 shows a brake system 100 in which the device 10 for collecting brake dust comprises flow disruptors 14, which generate successive flow vortices WR, WL with alternating directions of rotation in the particle flow PS. The vortex axes WA of the successive flow vortices WR, WL run parallel to the brake disc 108 and essentially in the radial direction. The flow disruptors 14 also extend in the radial direction. Reference sign 10 Device 12 Particle capture device 14, 14a, 14b Flow disturbance device 16 Interference body arrangement 18 air guide elements 20 series of interfering bodies 22 Row path 24 cases 100 braking system 102 disc brake 104 brake carriers 106 brake caliper 108 brake disc 110 brake pads BRB Direction of movement brake disc BP brake particles GV speed distribution PS Particle flow LPS laminar particle flow TPS turbulent particle flow W, WR, WL vortices WA Vertebral Axes

Claims

[1] Device (10) for collecting brake dust from a disc brake (102), with - a particle collection device (12) for collecting brake particles (BP) generated by friction between a brake pad (110) and a brake disc (108) of the disc brake (102); and - one or more flow disturbance bodies (14, 14a, 14b) which are designed to be surrounded by a particle flow (PS) comprising brake particles (BP) and to generate flow vortices (W, WR, WL) in the particle flow (PS) which transform a laminar particle flow (LPS) flowing along the brake disc (108) into a turbulent particle flow (TPS); characterized by , that one or more flow disturbance bodies (14, 14a, 14b) are designed to generate flow vortices (W, WR, WL) with different directions of rotation in the particle flow (PS). [2] Device (10) according to claim 1, characterized by, that several flow disturbance bodies (14, 14a, 14b) arranged along a series path (22) form a disturbance body row (20). [3] Device (10) according to claim 2, characterized by several rows of baffles (20), wherein the baffles (14, 14a, 14b) of the baffle rows (20) are arranged along spaced-apart row paths (22). [4] Device (10) according to any one of the preceding claims, characterized by , that two adjacent flow disturbance bodies (14, 14a, 14b) each form a disturbance body arrangement (16) which is designed to generate at least two adjacent flow vortices (WR, WL) with different directions of rotation in the particle flow (PS). [5] Device (10) according to claim 4, characterized by , that the flow disturbance bodies (14, 14a, 14b) of the disturbance body arrangement (16) have different orientations from each other. [6] Device (10) according to claim 4 or 5, characterized by, the disturbance body arrangement (16) is designed such that the at least two generated flow vortices (W, WR, WL) flowing side by side with different directions of rotation have vortex axes (WA) which run parallel to the brake disc (108). [7] Device (10) according to any one of the preceding claims, characterized by , that one or more flow disturbance bodies (14, 14a, 14b) are designed to generate successive flow vortices (W, WR, WL) with alternating directions of rotation in the particle flow (PS). [8] Device (10) according to claim 7, characterized by , that the one or more flow disturbance bodies (14, 14a, 14b) generating successive flow vortices (W, WR, WL) with alternating directions of rotation are designed such that the successive flow vortices (W, WR, WL) with alternating directions of rotation have parallel and / or wandering vortex axes (WA). [9] Device (10) according to claim 7 or 8, characterized by , that the vortex axes (WA) of the successive flow vortices (W, WR, WL) run with alternating directions of rotation essentially parallel to the brake disc (108) or essentially perpendicular to the brake disc (108). [10] Device (10) according to any one of the preceding claims, characterized by , that the flow disturbance bodies (14, 14a, 14b) have a round or oval or polygonal, in particular a rectangular or square or trapezoidal, cross-section. [11] Device (10) according to any one of the preceding claims, characterized by that the particle collection device (12) is designed as a particle filter or includes a particle filter. [12] Device (10) according to any one of the preceding claims, characterized by that the particle reception device (12) is designed as a particle removal system or includes an air removal system. [13] Device (10) according to any one of the preceding claims, characterized by a driveable flow generator which is configured to generate a particle discharge flow or an air discharge flow in the area of ​​the particle intake device (12). [14] Braking system (100) for a vehicle, with - a disc brake (102), and - a device (10) for collecting brake dust from the disc brake (102); characterized by , that the device (10) for collecting brake dust is designed according to one of the preceding claims. [15] Method for collecting brake dust from a disc brake (102) using a device (10) for collecting brake dust, in particular a device (10) according to any one of claims 1 to 13, comprising the steps: - Capture of brake particles (BP) generated by friction between a brake pad (110) and a brake disc (108) of the disc brake (102) by a particle capture device (12); and - Generating flow vortices (W, WR, WL) in a particle flow (PS) comprising brake particles (BP) by means of one or more flow disruptors (14, 14a, 14b) which are flowed around by the particle flow (PS), wherein the generated flow vortices (W, WR, WL) transform a laminar particle flow (LPS) flowing along the brake disc (108) into a turbulent particle flow (TPS); characterized by , that the generated flow vortices (W, WR, WL) have different directions of rotation. [16] Method according to claim 15, characterized by, that two adjacent flow disturbance bodies (14, 14a, 14b) each form a disturbance body arrangement (16) which generate at least two adjacent flow vortices (W, WR, WL) with different directions of rotation in the particle flow (PS). [17] Method according to claim 15 or 16, characterized by , that one or more flow disturbance bodies (14, 14a, 14b) in the particle flow (PS) generate successive flow vortices (W, WR, WL) with alternating directions of rotation.

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