Back plate for brake pad of disc brake
By designing a back plate with protrusions and specific side structures, the problems of thermal extension compensation and firmness of the disc brake pad back plate are solved, achieving higher rigidity and stability.
Patent Information
- Application Number
- CN202411661979.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-11-30
- Filing Date
- 2024-11-20
- Publication Date
- 2025-05-30
AI Technical Summary
The brake gasket back plates of existing disc brakes have problems of thermal extension compensation and insufficient braking gaskets during installation and use.
A back plate is designed with a protrusion and a specific side structure, which gradually tapers toward the free end in a direction away from the first side and is manufactured by a stamping process or a milling process to improve the rigidity and firmness of the back plate.
With this design, the backplate can more effectively resist deformation, improve the installation stability and firmness of the brake pads, ensuring that undesired deformation or failure occurs under high load conditions.
Smart Images
Figure CN120062262A_ABST
Abstract
Description
Field of the Invention
[0001] The present invention relates to a back plate for a brake pad of a disc brake. The present invention also relates to a brake pad for a disc brake and a disc brake for a vehicle. Background Art
[0002] The brake pads of disc brakes generally have a back plate to which a brake lining is fixed. The brake pad is mounted on a caliper and pressed against a brake disc in order to decelerate moving parts such as the axle of a motor vehicle. For example, when the brake is not currently being operated, the brake pad should be aligned with the caliper and held in place thereon. In addition, the mounting of the brake pad generally requires some compensation for thermal expansion, for example by mounting it in a floating manner.
[0003] ES 1 246 760 U describes a disc brake for a vehicle, which includes a brake pad arranged to press against a face of a brake disc. By means of a retainer, the brake pad is held in free axial movement. The brake pad has protrusions on the side opposite to the brake lining. The brake pad abuts against the radial inside of protrusions on a clamping caliper. Summary of the Invention
[0004] A first aspect relates to a back plate for a brake pad of a disc brake. The disc brake can be a braking system that pushes the brake pad against the brake disc for deceleration, such as the deceleration of a vehicle wheel. The brake disc can be, for example, a circular metal disc rotatably fixed to the wheel. The brake disc can have through holes for weight reduction and cooling. The brake pad can be a friction member of the disc brake. For example, during the operation of the brake, the brake pad can be pushed against the brake disc. The brake pad can be the worn part of the brake disc. The brake pad can be configured to be mounted to the caliper of the disc brake. The back plate can be a part of the brake pad to which the brake lining is mounted. The brake lining can be the consumable surface of the brake pad. For example, the brake lining can be a sintered material. The back plate can be a metal component. The back plate can be substantially plate-shaped. The back plate can be a part of the brake pad configured to be mounted on the caliper. The back plate can be an integral single-piece element. The back plate can be rigid. The back plate can be solid. The back plate can have through holes extending from a first side to a second side. For example, the back plate can have two such through holes. The through holes can be provided for weight reduction, brake lining fixation, or alternatively or additionally, guiding the guide pins of the caliper, which guide the brake pad when actuating the disc brake.
[0005] The backplate has a first side and a second side opposite and parallel to the first side. For example, the first side and the second side can extend in a radial direction and a circumferential direction. The first side and the second side can be planar. The first side and the second side can have a flat surface or can be configured as a flat surface. The first side is configured for mounting to a caliper of a vehicle disc brake. For example, the first side can rest on the caliper body or piston of the caliper. The piston or caliper can move in an axial direction. The radial extension and alternatively or additionally, the axial extension can correspond to the axial and radial extensions of the brake disc. The brake disc can have a rotationally symmetric central axis that corresponds to its axis of rotation. The axial extension can correspond to the axial movement axis of the piston, caliper, and alternatively or additionally correspond to the movement of the brake pads during disc braking operation. The first side can face away from the brake disc. The first side and the second side can be at least partially axially opposite surfaces of a section of the backplate.
[0006] The second side is configured for fixing the brake lining of the brake pad. For example, the brake lining can be riveted, glued, directly sintered, or otherwise fixed to the second side of the backplate. The second side can face the brake disc. The second side can extend parallel to an adjacent surface of the brake disc. The entire second side can be covered by the brake lining, or the outer edge of the second side can be without a brake lining cover.
[0007] The first side and the second side can be connected by a circumferential side of the backplate. Means for connecting to a retainer of the disc brake can be arranged on the circumferential side. Means for connecting a spring configured to press radially inward on the backplate can be arranged on the circumferential side. For example, there can be protrusions and alternatively or additionally, depressions, for holding the brake pads in the disc brake or in particular the caliper of the disc brake present on the circumferential side.
[0008] The backplate has a protrusion extending away from the first side. The protrusion may extend in a generally axial direction away from the first side. For example, the protrusion may extend from the first side by 4 mm to 6 mm, for example, 4.5 mm to 5.5 mm. The edge of the protrusion may be sharp or rounded. The protrusion forms a third side of the backplate and a fourth side of the backplate opposite the third side. For example, the fourth side may be radially outside the third side. The third side may form the lower side of the protrusion, and the fourth side may form the upper side of the protrusion. The third side and the fourth side of the backplate may also be considered as sides of the protrusion. The third side is configured to abut against the caliper of a vehicle disc brake. For example, the third side may rest on the radially outward-facing surface of the caliper. For example, the third side may form an end stop to prevent the brake pad from falling off the caliper. The third side may also prevent the brake pad from sliding radially inwards too far. The third side may help to correctly align and, additionally or alternatively, mount the brake pad on the caliper.
[0009] The fourth side of the backplate slopes towards the third side in a direction away from the first side. The fourth side may be angled towards the central axis of the brake disc. The protrusion may thus taper towards its free end. For example, the radial extension of the protrusion may contract as the distance from the first side increases. In other words: the height of the protrusion may taper towards its free end. Correspondingly, the protrusion may thus taper to a wider base that forms a connection with the remainder of the backplate. The base may connect the protrusion to the first side or may be adjacent to the first side. The wider base may stiffen the protrusion against deformation. Thus, unwanted deformation or failure of the protrusion can be avoided. Additionally, the smaller free end of the protrusion may allow for a more rigid caliper. For example, a recess configured to receive the protrusion may have a smaller radial extension at its bottom. Due to the geometry of the protrusion, the brake pad can also be pushed radially inwards with a greater force, thereby holding the brake pad more firmly in place. The end face of the protrusion may have a smaller area than the base.
[0010] Each of the above-mentioned sides and any of the subsequently numbered sides may be configured as a flat surface. This configuration is easy to manufacture. However, the fourth side may also be curved, for example, forming a concave or convex surface. This configuration of the fourth side may allow for higher loads without deformation. The third side may be curved, for example, in the circumferential direction. This configuration may allow for the use of a caliper with a uniform thickness or, alternatively or additionally, a uniform radial extension along the circumferential direction. The third side may be configured to have a shape corresponding to the shape of the surface of the caliper on which it rests.
[0011] According to an embodiment of the backplate, the fourth side extends at an angle of 5 degrees to 45 degrees relative to an axis extending perpendicularly from the first side. For example, the fourth side may extend at an angle of 7 degrees to 35 degrees or 10 degrees to 25 degrees relative to an axis extending perpendicularly from the first side. Such an angle can result in a rigid protrusion and a compact disc brake. When the brake pads are installed in the 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.
[0012] The third side may extend parallel to an axis extending perpendicularly from the first side. The third side may extend perpendicular to the second side. Such an extension can facilitate the installation of the brake pads and the manufacture of the disc brake.
[0013] According to an embodiment of the backplate, the third side and the fourth side each have a first end adjacent to the first side and a second end opposite the first end. The first end may connect the third side and the fourth side to the remainder of the backplate. The second end may form the free end of the protrusion and connect the third side and the fourth side to the free end surface. The free end surface of the protrusion may 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 may form the free end surface of the protrusion. The fifth side may extend in the radial direction and the circumferential direction. The fifth side extends parallel to the first side. Such a configuration is easy to manufacture. The fifth side may extend between the third side and the fourth side. The fifth side may form part of the protrusion. The fifth side may have a smaller radial extension 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 protrusion.
[0014] According to an embodiment of the backplate, the backplate has a sixth side connecting the third side to the first side. The sixth side may be recessed relative to the first side. Such a recessed sixth side can facilitate, for example, manufacturing and installation by a stamping process, such as by compensating for manufacturing tolerances in orientation and additionally or alternatively the flatness of the first side and the third side. The sixth side may be disposed at least radially inside the protrusion between the protrusion 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 protrusion to the first side. The sixth side may surround the protrusion. Thus, the first side and the protrusion may be spaced apart by the sixth side. The sixth may connect the outer surface of the protrusion 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 the first side.
[0015] According to an embodiment of the backplate, the sixth side is recessed relative to the first side by at least the length of the radius between the sixth side and the third side. This configuration can ensure that the backplate smoothly abuts against the first side of the caliper and does not skew the radius between the sixth side and the third side that contacts the caliper. This radius may be necessary due to manufacturing and can also reduce the risk of cracks in the backplate. For example, the radius can be 0.01 mm, 0.02 mm, 0.05 mm, 0.1 mm, or 0.2 mm. Correspondingly, the depth of the sixth surface relative to the first side can 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 can be recessed relative to the first side by no more than 0.2 mm, 0.5 mm, 1 mm, or 2 mm.
[0016] According to an embodiment of the backplate, the protrusion has been formed by a stamping process. Manufacturing the backplate using a stamping process can be very cost-effective. For example, the backplate can be formed from a flat metal sheet. The entire backplate can be formed by a stamping process. The plate can be stamped from the metal sheet using a tool. At the same time, the protrusion can be formed by an insert or protrusion in the stamping tool. The sixth side can also be formed, for example, due to the tool that supports the metal sheet during the formation of the protrusion. The protrusion can also be formed before or after stamping the backplate or backplate precursor out of the metal sheet. The protrusion and additionally or alternatively the sixth side can be formed in a deep drawing step.
[0017] Alternatively, the backplate can be produced, for example, by a milling process. For example, the backplate can be milled from a solid metal block. Milling can allow for the manufacture of very thick backplates. Additionally, the backplate can be more elastic due to the lack of internal stresses typically introduced by deformation processes.
[0018] According to an embodiment of the backplate, the backplate has a recess at the second side, and the recess can correspond to the protrusion. Such a backplate can be very light. Such a backplate can be easily manufactured from a flat metal sheet by a stamping process. For example, the backplate can have a substantially uniform thickness. The thickness of the backplate can be between 8 mm and 10 mm, for example, between 8.5 mm and 9.5 mm. Such a recess can facilitate the fixing of the brake lining. For example, the recess can extend towards the first side. The bottom of the recess can correspond to the fifth side and can be the opposite side of the wall forming the fifth side. The wall of the recess can correspond to the third side and can be the opposite side of the wall forming the third side. Another wall of the recess can correspond to the fourth side and can be the opposite side of the wall forming the fourth side.
[0019] The second aspect relates to a brake pad for a disc brake. The brake pad includes a back plate according to the first aspect. The embodiments, examples, and features of the first aspect constitute the embodiments, examples, and features of the second aspect, and vice versa. The brake pad further includes a brake lining fixed to the second side of the back plate. The brake pad may also include means for detecting wear of the brake lining, such as a sensor, a marker, or a wire embedded in the brake lining.
[0020] The 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 includes a brake pad according to the second aspect, or at least includes a back plate according to the first aspect. The embodiments, examples, and features of the first and second aspects constitute the embodiments, examples, and features of the third aspect, and vice versa. The disc brake includes a brake disc, such as a ceramic or metal brake disc. The disc brake includes a caliper. The caliper may have a first brake pad mounting side and a second brake pad mounting side, which extend, for example, orthogonally to each other. The brake pad may be mounted on the first side of the back plate on the first brake pad mounting side of the caliper. For example, the first side may rest on the first brake pad mounting side or may be attached to the caliper. The brake pad may be mounted on the third side of the back plate on the second brake pad mounting side of the caliper. For example, the third side may rest on the second brake pad mounting side, and optionally may be pressed against the second brake pad mounting side by a spring or other biasing means. The brake pad mounting sides may be configured as resting sides.
[0021] The first brake pad mounting side may be formed, for example, by a body portion of the caliper, a piston, or some other brake pad actuating element, such as a lever. The second brake pad mounting side may be formed, for example, by a body portion of the caliper. The disc brake may include a component for moving the brake pad, and additionally or alternatively, a portion of the brake pad is mounted to, such as a piston or a lever. The body portion of the caliper may also be movable. For example, when the brake is operated, the movement may be axially towards the brake disc. The disc brake may be configured to press the brake pad against the brake disc when the disc brake is operated. The disc brake may include two brake pads, for example, which press against the brake disc from opposite sides when the brake is operated. The two brake pads may be the same or may have different back plates. For example, the second brake pad of the disc brake may have only two parallel sides and no axially extending protrusions. The first brake pad mounting side may be, for example, a flat surface. The second brake pad mounting side may be, for example, a flat surface. The shape of the first brake pad mounting side may, for example, correspond to the shape of the first side of the back plate. The shape of the second brake pad mounting side may, for example, correspond to the shape of the third side of the back plate.
[0022] According to an embodiment of the backplate, the first brake pad mounting side extends in the radial direction and additionally or alternatively in the circumferential direction. When the brake pad is mounted in a disc brake, the first brake pad mounting side can extend parallel to the first side of the backplate. The second brake pad mounting side can extend in the axial direction. Additionally or alternatively, for example, if configured as a flat surface, the second brake pad mounting side can extend tangentially into the circumferential direction. Alternatively, for example, if it is a curved surface, the second brake pad mounting side can extend circumferentially. The protrusions can generally extend axially from the first side and away from the brake disc. Description of the Drawings
[0023] Figure 1 The backplate of the brake pad of a disc brake is shown in a schematic perspective view.
[0024] Figure 2 Shown in a schematic perspective view Figure 1 details of the backplate of
[0025] Figure 3 Shown in a schematic side view Figure 1 details of the backplate of Detailed Description
[0026] Figures 1 to 3 A brake pad of a disc brake is shown. The backplate has been manufactured from a metal sheet by a stamping process. The backplate 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 the caliper of a vehicle disc brake. The second side 12 is for fixing the brake lining of the brake pad and faces away from the observer in Figure 1 and Figure 2 When the brake pad is mounted in a disc brake, the first side 10 and the second side 12 extend in the radial direction and the circumferential direction. When the brake pad is mounted in a disc brake, the second side 12 faces the brake disc and extends generally parallel to the brake disc. Two through holes 14 extend from the first side 10 to the second side in the axial direction through the backplate. The through holes 14 are configured to receive the guide pins of the disc brake and are closed at the second side 12 by the brake lining. The circumferential side 16 extends between the first side 10 and the second side 12. The circumferential side 16 extends in the axial direction and forms the outer edge of the brake pad. At the upper end of the backplate, the backplate has two hook-shaped protrusions 18 protruding from the circumferential side 16. The hook-shaped protrusions 18 are configured to attach a biasing device, such as a spring element, that presses the backplate and thus presses the brake pad radially inward against its seat.
[0027] The backplate has a protrusion 20 extending away from the first side 10. When the brake pad is installed in the disc brake, the protrusion 20 extends away from the brake disc and towards the caliper. The protrusion 20 forms a third side 22 of the backplate and a fourth side 24 of the backplate opposite the third side 22, the orientation of which can be seen best in Figure 3 . The third side 22 is configured to abut against the caliper of the vehicle disc brake and extends orthogonally from the first side 10. The third side 22 is pressed against the caliper by a biasing device and thus forms the surface on which the brake pad is seated in the disc brake. The fourth side 24 is angled towards the third side 22 in a direction away from the first side 10. The angle is indicated by an arrow 26 in Figure 3 and is 15° in the example shown. The protrusion 20 thus tapers towards its free end. Accordingly, the radial extension of the protrusion 20 (which can be regarded as its height) decreases in the axial direction away from the first side 10. The base of the protrusion 20 forms the connection between the protrusion 20 and the remainder of the backplate and thus has a larger covered area than the surface area of the fifth side 28. The protrusion 20 can thus withstand higher loads than a protrusion with a constant cross-section and a non-inclined fourth side. The fifth side 28 extends parallel to the first side 10.
[0028] The backplate 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 the base of the protrusion 20 and forms a connection with the first side 10. The sixth side 30 is recessed relative to the first side 10 and is thus 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 the length of the radius between the sixth side 30 and the third side 22. In the currently shown example, the sixth side 30 is recessed 0.2 mm in the axial direction relative to the first side 10. The sixth side 30 extends parallel to the first side 10.
[0029] The protrusion 20 is formed by deforming a metal sheet during a stamping process. Accordingly, the backplate has a recess at the second side 12 that corresponds to the protrusion 20. The recess has a bottom side that forms the back side of the wall that forms the fifth side 28.
[0030] In the illustrated example, the radial extension of the fifth side 28 is 6 mm. In the illustrated example, the axial extension of the protrusion 20 is 5 mm. In the illustrated example, the axial thickness of the backplate and thus the distance between the first side 10 and the second side 12 is 9 mm. In the illustrated example, the extension of the protrusion in the direction tangential to the circumferential direction is 50 mm. In the illustrated example, the sixth side 30 has a width 10 mm below the third side 22 and a smaller width above the fourth side 24, such that the width of the axial protrusion relative to the fifth side 28 is constant. In another embodiment, the sixth side 30 may have a constant width of 10 mm.
[0031] Reference numeral
[0032] 10 First side
[0033] 12 Second side
[0034] 14 Through hole
[0035] 16 Circumferential side
[0036] 18 Hook-shaped protrusion
[0037] 20 Protrusion
[0038] 22 Third side
[0039] 24 Fourth side
[0040] 26 Arrow / angle
[0041] 28 Fifth side
[0042] 30 Sixth side.
Claims
1. A back plate for a brake pad of a disc brake, wherein: The back plate has a first side surface (10) and a second side surface (12) opposite to and parallel to the first side surface (10). wherein the first side surface (10) is configured to be mounted to a caliper of a vehicle disc brake, The second side surface (12) is configured as a brake lining for fixing the brake pad. The back plate has a protrusion (20) extending away from the first side surface (10). The protrusion (20) forms a third side surface (22) of the back plate and a fourth side surface (24) of the back plate, and the fourth side surface is opposite to the third side surface (22). wherein the third side surface (22) is configured to abut against a caliper of the vehicle disc brake, and The fourth side surface (24) is angled toward the third side surface (22) in a direction away from the first side surface (10).
2. The back plate according to claim 1, characterized in that: The fourth side (24) extends at an angle (26) of 5 to 45 degrees relative to an axis extending perpendicular to the first side (10).
3. The back plate according to claim 1 or 2, characterized in that: The third side surface (22) and the fourth side surface (24) each have a first end adjacent to the first side surface (10) and a second end opposite to the first end, The second end of the third side surface (22) and the second end of the fourth side surface (24) are connected via a fifth side surface (28). The fifth side surface (28) extends parallel to the first side surface (10).
4. A back plate according to any one of the preceding claims, characterised in that The back plate has a sixth side surface (30) connecting the third side surface (22) and the first side surface (10), The sixth side surface (30) is recessed relative to the first side surface (10).
5. The back plate according to claim 4, characterized in that: The sixth side surface (30) is recessed relative to the first side surface (10) by at least the length of a radius between the sixth side surface (30) and the third side surface (22).
6. A back plate according to any one of the preceding claims, characterised in that The protrusion (20) is formed by a stamping process.
7. A back plate according to any one of the preceding claims, characterised in that The back plate has a recessed portion on the second side surface (12), the recessed portion corresponding to the protruding portion (20).
8. A brake pad for a disc brake, the brake pad comprising a back plate according to any one of the preceding claims and a brake lining fixed to the second side (12) of the back plate.
9. A disc brake for a vehicle, comprising the brake pad according to claim 8, a brake disc, and a caliper having a first brake pad mounting side and a second brake pad mounting side, wherein the brake pad is mounted to the first side (10) of the back plate on a first brake pad mounting side of the caliper, and The brake pad is mounted to the third side (22) of the back plate on the second brake pad mounting side of the caliper.
10. The disc brake according to claim 9, characterized in that The first brake pad mounting side extends in a radial direction, and The second brake pad mounting side extends in an axial direction.