Backing plate for a brake pad of a disc brake

Abstract

The present invention relates to a backing plate for a disc brake pad, which has a first face (10) and a second face (12) opposite and parallel to the first face (10). The first face (10) is configured for mounting on the vehicle's disc brake caliper. The second face (10) is configured for securing the brake lining of the pad. The backing plate has a protrusion (20) extending from the first face (10). The protrusion (20) forms a third face (22) of the backing plate and a fourth face (24) opposite the third face (22). The third face (22) is configured to bear against the vehicle's disc brake caliper. The fourth face (24) is inclined toward the third face (22) in the opposite direction to the first face (10). The invention also relates to a brake pad and a disc brake.

Description

Backing plate for a brake pad of a disc brake Technical field The present invention relates to a backing plate for a brake pad of a disc brake. The present invention also relates to a brake pad for a disc brake and to a disc brake for a vehicle. Previous technique Brake pads for disc brakes typically consist of a backing plate with a brake lining attached to it. The brake pad is mounted in a caliper and pressed against a brake disc to decelerate a moving part, such as a vehicle axle. The brake pad must be aligned with the caliper and held in position, for example, when the brake is not being applied. Furthermore, brake pad mounting usually requires some compensation for thermal expansion, for example, through a floating mount. Document ES 1 246 760 U describes a disc brake for vehicles, comprising brake pads arranged to press against the faces of a brake disc. The brake pads are held freely with axial movement by a retaining element. The brake pads have a projection on one side opposite the brake lining. The brake pad rests with an inner radial side of the projection on a retaining clamp. Summary of the invention The first aspect concerns a backing plate for a brake pad of a disc brake. A disc brake is a braking system that pushes brake pads against a brake disc for deceleration, for example, the deceleration of a vehicle's wheel. The brake disc is a circular metal disc, for example, rotatably mounted to the wheel. The brake disc may have through-holes for weight reduction and cooling. The brake pad is a friction element of the disc brake. For example, during braking, the brake pad is pressed against the brake disc. The brake pad is a wear part of the brake disc. The brake pad is configured for mounting on a disc brake caliper. The backing plate is the part of the brake pad on which the brake lining is mounted.The brake lining may be a consumable surface of the brake pad. For example, the brake lining may be a sintered material. The backing plate may be a metal piece. The backing plate may be substantially plate-shaped. The backing plate may be the part of the brake pad configured for mounting on the caliper. The backing plate may be a single, one-piece component. The backing plate may be rigid. The backing plate may be solid. The backing plate may have through-holes extending from one side to the other. For example, the backing plate may have two such through-holes. The through-holes may be provided for weight reduction, securing the brake lining, and, alternatively or additionally, for caliper guide pins that guide the brake pad when the disc brake is actuated.The backing plate has a first side and a second side opposite and parallel to the first side. For example, the first and second sides may extend radially and circumferentially. The first and second sides may be flat. The first and second sides may have a flat surface or be configured as a flat surface. The first side is configured for mounting on a vehicle disc brake caliper. For example, the first side may rest on a caliper body or a caliper piston. The piston or caliper may be axially movable. The radial extension and, alternatively or additionally, the axial extension may correspond to the axial and radial extension of the brake disc. The brake disc may have a central axis of rotational symmetry that corresponds to its axis of rotation.The axial extension may correspond to an axial movement axis of the piston, the caliper, and, alternatively or additionally, to a movement of the brake pad during disc brake operation. The first side may be oriented away from the brake disc. The first and second sides may be at least partially axially opposite surfaces of a backing plate section. The second side is configured for the attachment of a brake lining from the brake pad. For example, the brake lining may be riveted, glued, sintered directly onto, or otherwise attached to the second side of the backing plate. The second side may face the brake disc. The second side may extend parallel to the adjacent surface of the brake disc. The entire second side may be covered by the brake lining, or an outer edge of the second side may be free of brake lining coverage. The first and second sides may be connected by a circumferential side of the backing plate. Means for connection to a disc brake retaining element may be arranged on the circumferential side. Means for connecting a spring configured to press radially inward against the backing plate may also be arranged on the circumferential side. For example, projections and, alternatively or additionally, depressions for retaining the brake pad in the disc brake or specifically in the disc brake caliper may be present on the circumferential side. The backing plate has a projection extending away from the first side. The projection can extend in a generally axial direction away from the first side. For example, the projection can extend between 4 mm and 6 mm from the first side, or between 4.5 mm and 5.5 mm. The edges of the projection can be sharp or rounded. The projection forms a third side of the backing plate and a fourth side opposite the third side. For example, the fourth side can be radially oriented outward from the third side. The third side can form a lower side of the projection, and the fourth side a higher side. The third and fourth sides of the backing plate can also be considered sides of the projection. The third side is configured to rest against the vehicle's disc brake caliper. For example, the third side can rest on a surface oriented radially outward from the caliper.For example, the third side can form an end stop that prevents the brake pad from coming off the caliper. The third side can also prevent the brake pad from moving too far inward radially. The third side can aid in proper centering and, additionally or alternatively, in mounting the brake pad to the caliper. The fourth side of the backing plate is angled towards the third side in a direction away from the first side. The fourth side may be angled towards a central axis of the brake disc. The projection may therefore taper towards its free end. For example, the radial extension of the projection may decrease with increasing distance from the first side. In other words, the height of the projection may taper towards its free end. Consequently, the projection may taper to a wider base that forms a connection with the rest of the backing plate. The base may connect the projection to the first side or may be adjacent to the first side. The wider base may stiffen the projection against deformation. In this way, unwanted deformation or failure of the projection may be avoided. Furthermore, the smaller free end of the projection may allow for a more rigid caliper.For example, a recess designed to receive the protrusion may have a smaller radial extension at its bottom. The brake pad may also be pushed radially inward with greater force due to the protrusion's geometry, thus holding the brake pad more firmly in position. One end face of the protrusion may have a smaller area than its base. Each of the sides mentioned above, as well as any of the sides numbered subsequently, can be configured as a flat surface. Such a configuration can be easy to manufacture. However, the fourth side can also be curved, for example, forming a concave or convex surface. Such a configuration of the fourth side can allow for higher loads without deformation. The third side can be curved, for example, in a circumferential direction. Such a configuration can allow the use of a clamp with a uniform thickness and, additionally or alternatively, a uniform radial extension along the circumferential direction. The third side can be configured with a shape corresponding to a surface of the clamp on which the third side rests. According to one embodiment of the backing plate, the fourth side extends at an angle of 5 to 45 degrees with respect to an axis extending perpendicularly from the first side. For example, the fourth side may extend at an angle of 7 to 35 degrees or 10 to 25 degrees with respect to an axis extending perpendicularly from the first side. Such angles can result in a rigid projection or a compact disc brake. The axis extending perpendicularly from the first side may correspond to the axial direction and thus also to the axis of rotation of the brake disc when the brake pad is mounted on the disc brake. The third side can extend parallel to the axis that extends perpendicularly from the first side. The third side can also extend perpendicularly from the second side. Such an extension can facilitate the mounting of the brake pad and the manufacture of the disc brake. According to one embodiment of the support plate, the third and fourth sides each have a first end adjacent to the first side and a second end opposite the first end. The first ends can connect the third and fourth sides to the rest of the support plate. The second ends can form free ends of the projection and connect the third and fourth sides with a free end surface. The free end surface of the projection can extend parallel to the first side. The second end of the third side and the second end of the fourth side are connected by a fifth side. The fifth side can form the free end surface of the projection. The fifth side can extend in the radial and circumferential directions. The fifth side extends parallel to the first side. Such a configuration can be easy to manufacture. The fifth side can extend between the third and fourth sides.The fifth side may form part of the projection. The fifth side may have a radial extent less than the radial distance between the first end of the third side and the first end of the fourth side. The fifth side may have a smaller area than the base of the projection. According to one embodiment of the support plate, the support plate has a sixth side connecting the third side to the first side. The sixth side may be recessed relative to the first side. This recessed sixth side can facilitate manufacturing, for example, in a stamping process, and assembly, for example, by compensating for manufacturing tolerances in the orientation and, additionally or alternatively, the flatness of the first and third sides. The sixth side may at least be arranged radially inward toward the projection between the projection and the first side. The sixth side may be parallel to the first side. The sixth side may also connect the fourth side to the first side. The sixth side may connect the base of the projection to the first side. The sixth side may surround the projection. The first side and the projection may thus be separated by the sixth side. The sixth side may connect outer surfaces of the projection to the first side.The sixth surface may be recessed in the axial direction. For example, the sixth surface may be closer to the second side than to the first side. According to one embodiment of the support plate, the sixth side is recessed relative to the first side by at least a radius equal to the distance between the sixth and third sides. This configuration ensures that the support plate makes smooth contact with the gripper on the first side and does not tilt due to the radius between the sixth and third sides in contact with the gripper. This radius may be necessary due to manufacturing requirements and can also reduce the risk of breakage of the backing plate. For example, the radius may be 0.01 mm, 0.02 mm, 0.05 mm, 0.1 mm, or 0.2 mm. Correspondingly, the depth of the sixth surfaces relative to the first side may be at least 0.01 mm, 0.02 mm, 0.05 mm, 0.1 mm, 0.2 mm, or 0.5 mm. For example, the sixth surface may be recessed relative to the first side by no more than 0.2 mm, 0.5 mm, 1 mm, or 2 mm. According to one embodiment of the backing plate, the protrusion is formed by a stamping process. The backing plate can be manufactured very economically by stamping. For example, the backing plate can be formed from a flat sheet of metal. The entire backing plate can be formed in a stamping process. The plate can be stamped from the sheet metal using a tool. Simultaneously, the protrusion can be formed by an insert or protrusion in the stamping tool. The sixth side can also be formed, for example, by the tool's support on the sheet metal during protrusion formation. The protrusion can also be formed before or after stamping a backing plate or a backing plate precursor from the sheet metal. The protrusion and, additionally or alternatively, the sixth side can be formed in a deep drawing stage. Alternatively, the support plate can be produced, for example, by a milling process. For instance, the support plate can be machined from a solid block of metal. Milling allows for the production of a very thick support plate. Furthermore, the support plate can be stronger due to the absence of internal stresses typically introduced by deformation processes. According to one embodiment of the backing plate, the backing plate has a recess on the second side, which may correspond to the projection. Such a backing plate may be very lightweight. Such a backing plate may be easily manufactured by stamping from a flat sheet of metal. For example, the backing plate may have a generally uniform thickness. The thickness of the backing plate may be between 8 mm and 10 mm, for example, between 8.5 mm and 9.5 mm. Such a recess may facilitate the attachment of the brake lining. For example, the recess may extend towards the first side. One end of the recess may correspond to the fifth side and may be an opposite side of a wall forming the fifth side. One side of the recess may correspond to the third side and may be an opposite side of a wall forming the third side. Another side of the recess may correspond to the fourth side and may be an opposite side of a wall forming the fourth side. A second aspect relates to a brake pad for a disc brake. The brake pad comprises the backing plate according to the first aspect. The embodiments, examples, and features of the first aspect constitute embodiments, examples, and features of the second aspect and vice versa. The brake pad also comprises a brake lining attached to the second side of the backing plate. The brake pad may also include means for detecting wear of the brake lining, such as a sensor, markings, or an electrical wire embedded in the brake lining. A third aspect relates to a disc brake for a vehicle. The disc brake may be configured, for example, for hydraulic or pneumatic actuation. The vehicle may be a car, a truck, or a trailer. The disc brake comprises a brake pad according to the second aspect or at least comprises a backing plate according to the first aspect. The embodiments, examples, and features of the first and second aspects constitute embodiments, examples, and features of the third aspect, and vice versa. The disc brake comprises a brake disc, for example, a ceramic or metallic brake disc. The disc brake comprises a caliper. The caliper may have a first brake pad mounting side and a second brake pad mounting side, for example, extending orthogonally to each other. The brake pad may be mounted on the first side of the backing plate on the first brake pad mounting side of the caliper.For example, the first side can rest on the first mounting side of the brake pad or it can be fixed to the caliper. The brake pad can be mounted on the third side of the backing plate over the second mounting side of the brake pad on the caliper. For example, the third side can rest on the second mounting side of the brake pad, optionally while being pressed by a spring or other pushing means against the second mounting side of the brake pad. The mounting sides of the brake pad can be configured as support sides. The first mounting side of the brake pad may consist, for example, of a caliper body, a piston, or another actuating element of the caliper that acts on the brake pad, such as a lever. The second mounting side of the brake pad may consist, for example, of a caliper body. The disc brake may include parts for moving the brake pad and, additionally or alternatively, the part to which the brake pad is mounted, such as a piston or lever. The caliper body may also be movable. The movement may be, for example, axial toward the brake disc when the brake is in operation. The disc brake may be configured to press the brake pad against the brake disc during operation. The disc brake may include two brake pads, for example, pressing against the brake disc from opposite sides when the brake is applied.The two brake pads can be identical or they can have different backing plates. For example, a second brake pad for a disc brake might have only two parallel sides without the axially extending protrusion. The first mounting side of the brake pad might be, for example, a flat surface. The second mounting side of the brake pad might also be a flat surface. The shape of the first mounting side of the brake pad might correspond, for example, to the shape of the first side of the backing plate. The shape of the second mounting side of the brake pad might correspond, for example, to the shape of the third side of the backing plate. According to one embodiment of the backing plate, the first mounting side of the brake pad extends radially and, additionally or alternatively, circumferentially. The first mounting side of the brake pad may extend parallel to the first side of the backing plate when the brake pad is mounted on a disc brake. The second mounting side of the brake pad may extend axially. Additionally or alternatively, the second mounting side of the brake pad may extend tangentially to the circumferential direction, for example, if it is configured as a flat surface. Alternatively, the second mounting side of the brake pad may extend circumferentially, for example, if it is a curved surface. The projection may generally extend axially from the first side and away from the brake disc. Brief description of the figures Figure 1 shows a backing plate for a brake pad of a disc brake in a schematic perspective view. Figure 2 shows details of the support plate from Figure 1 in a schematic perspective view. Figure 3 shows details of the support plate from Figure 1 in a side schematic view. Detailed description of achievements Figures 1 to 3 show a brake pad for a disc brake. The backing plate has been manufactured from sheet metal by a stamping process. The backing plate has a first side 10 and a second side 12 opposite and parallel to the first side 10. Each side 10, 12 is configured as a flat surface. The first side 10 is configured to be mounted on a caliper of the vehicle's disc brake. The second side 12 is configured for the attachment of a brake lining of the brake pad and is oriented away from the observer in Figures 1 and 2. The first side 10 and the second side 12 extend radially and circumferentially when the brake pad is mounted on the disc brake. The second side 12 is oriented toward, and generally extends parallel to, the brake disc when the brake pad is mounted on the disc brake.Two through-holes 14 extend axially from the first side 10 to the second side through the backing plate. The through-holes 14 are configured to receive disc brake guide pins and are closed on the second side 12 by the brake lining. A circumferential side 16 extends between the first side 10 and the second side 12. The circumferential side 16 extends axially and forms an outer edge of the brake pad. At an upper end of the backing plate, the backing plate has two hook-shaped projections 18 extending from the circumferential side 16. The hook-shaped projections 18 are configured for the attachment of a thrust device, such as a spring element, which presses the backing plate, and thus the brake pad, radially inward against its seat. The backing plate has a projection 20 extending away from the first side 10. The projection 20 extends away from the brake disc and toward the caliper when the brake pad is mounted on the disc brake. The projection 20 forms a third side 22 of the backing plate and a fourth side 24 of the backing plate opposite the third side 22, the orientation of which can be seen more clearly in Figure 3. The third side 22 is configured to rest against the caliper of the vehicle's disc brake and extends orthogonally from the first side 10. The third side 22 is pressed against the caliper by the pusher device and thus forms a surface with which the brake pad seats on the disc brake. The fourth side 24 is angled toward the third side 22 in a direction away from the first side 10. An angle is indicated in Figure 3 by arrow 26, which is 15° in the example shown. The protrusion 20 narrows towards its free end.A radial extension of the projection 20, which can be considered its height, decreases in the axial direction away from the first side 10. The base of the projection 20, which forms the connection between the projection 20 and the rest of the support plate, thus has a larger footprint than the surface area of ​​a fifth side 28. The projection 20 can therefore support greater loads than a projection with a constant cross-section and a non-inclined fourth side. The fifth side 28 extends parallel to the first side 10. The support plate has a sixth side 30 that connects the third side 22 and the fourth side 24 to the first side 10. The sixth side 30 surrounds a base of the projection 20 and forms a connection with the first side 10. The sixth side 30 is recessed relative to the first side 10 and is therefore closer to the second side 12 than the first side 10. The sixth side 30 is recessed relative to the first side 10 by at least a radius between the sixth side 30 and the third side 22. In the example shown, the sixth side 30 is recessed 0.2 mm axially relative to the first side 10. The sixth side 30 extends parallel to the first side 10. The projection 20 is formed by deforming the sheet metal during the stamping process. Consequently, the support plate has a recess on the second side 12 corresponding to the projection 20. The recess has a bottom side that forms a back face of the wall that forms the fifth side 28. The radial extension of the fifth side 28 is 6 mm in the example shown. The axial extension of the projection 20 is 5 mm in the example shown. The axial thickness of the support plate, and therefore the distance between the first side 10 and the second side 12, is 9 mm in the example shown. The extension of the projection in the tangential direction to the circumferential direction is 50 mm in the example shown. The sixth side 30 has a width of 10 mm below the third side 22 in the example shown and a lesser width above the fourth side 24, so that its width relative to an axial projection of the fifth side 28 is constant. In another embodiment, the sixth side 30 may have a constant width of 10 mm. Reference signs 10 first side 12 second side 14 through hole 16 circumferential side 18 hook-shaped protrusions 20 outgoing 22 third side 24 fourth side 26 arrow / angle 28 fifth side 30 sixth side

Claims

1. A backing plate for a brake pad of a disc brake, wherein the backing plate has a first side (10) and a second side (12) opposite and parallel to the first side (10), wherein the first side (10) is configured for mounting on a caliper of the vehicle's disc brake, wherein the second side (10) is configured for securing a brake lining of the brake pad, wherein the backing plate has a projection (20) extending away from the first side (10), wherein the projection (20) forms a third side (22) of the backing plate and a fourth side (24) of the backing plate opposite the third side (22), wherein the third side (22) is configured to rest against the caliper of the vehicle's disc brake, and wherein the fourth side (24) is inclined towards the third side (22) in a direction away from the first side (10). 2.Support plate according to claim 1, characterized in that the fourth side (24) extends at an angle (26) of 5 degrees to 45 degrees with respect to an axis extending perpendicularly from the first side (10).

3. Support plate according to claim 1 or 2, characterized in that the third side (22) and the fourth side (24) each have a first end adjacent to the first side (10) and a second end opposite the first end, wherein the second end of the third side (22) and the second end of the fourth side (24) are connected by a fifth side (28), wherein the fifth side (28) extends parallel to the first side (10).

4. Support plate according to any of the preceding claims, characterized in that the support plate has a sixth side (30) connecting the third side (22) to the first side (10), wherein the sixth side (30) is recessed with respect to the first side (10). 5.Support plate according to claim 4, characterized in that the sixth side (30) is recessed relative to the first side (10) by at least a length equal to the radius between the sixth side (30) and the third side (22).

6. Support plate according to any of the preceding claims, characterized in that the projection (20) has been formed by a stamping process.

7. Support plate according to any of the preceding claims, characterized in that the support plate has a recess on the second side (10) corresponding to the projection (20).

8. Brake pad for a disc brake comprising a support plate according to any of the preceding claims and a brake lining fixed to the second side (10) of the support plate. 9.A disc brake for a vehicle, the disc brake comprising a brake pad according to claim 8, a brake disc, and a caliper with a first brake pad mounting side and a second brake pad mounting side, wherein the brake pad is mounted on the first side (10) of the backing plate on the first brake pad mounting side of the caliper, and wherein the brake pad is mounted on the third side (22) of the backing plate on the second brake pad mounting side of the caliper.

10. A disc brake according to claim 9, characterized in that the first brake pad mounting side extends radially and the second brake pad mounting side extends axially.

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