Patent Application
20190301551
The invention relates to a carrier pot for a brake disk, having a radially internal hub ring portion for securing to a wheel hub and having a radially external brake disk ring portion for securing to the brake disk.
The invention further relates to a disk brake device for a wheel brake of a vehicle, in particular a motor vehicle, having at least one brake disk and having at least one carrier pot which is connected to the brake disk in a rotationally secure manner.
Carrier pots and brake disk devices of the type mentioned in the introduction are known from the prior art. Different types of brake disk devices for vehicles are known. In the simplest case, the brake disk devices are constructed in one piece and have the brake disk ring and the carrier pot. Such brake disk devices are produced, for example, in one piece from grey cast iron or aluminum. In the case of two-piece brake disk devices, the carrier pot is often produced from a material which is different from that of the brake disk itself in order to adapt the two elements optimally to the stresses, respectively. As a result of the increasing requirements in terms of fuel consumption and durability, attempts are also being made to bring about weight reductions in the brakes of motor vehicles. Accordingly, it is desirable to use materials which are as light as possible.
The carrier pot according to the invention having the features of claim 1 has the advantage that it also ensures a sufficiently high level of durability for uses in the vehicle with a higher drive power with an extremely low weight. In this case, the basic material of the carrier pot comprises plastics material, which results in an advantageously low weight of the carrier pot. A plurality of fibers extend through the plastics material and impart the necessary rigidity and durability to the carrier pot. In this case, there is provision for the carrier pot to be produced from a particularly high-temperature-resistant fiber plastics composite which has a plurality of fiber layers each having a large number of fibers, wherein the fibers of at least two adjacent layers are orientated differently relative to each other. As a result of the differently orientated fiber layers, a high mechanical durability of the carrier pot is ensured with a low weight. By a high-temperature-resistant plastics material being selected, the dimensional stability of the component or carrier pot and consequently the optimum force introduction into the fibers are also ensured at temperatures above 150° C. The production of fiber plastics composite materials has further become more cost-effective in recent years so that the advantageous configuration of the carrier pot does not result in significant cost disadvantages.
According to a preferred development of the invention, there is provision for the fibers of the at least two layers to be orientated at least substantially perpendicularly to each other. As a result of the perpendicular orientation, it is ensured that the carrier pot ensures the desired durability of the material composite/fiber plastics composite both when it is loaded in terms of pressure and when it is loaded in terms of tension, that is to say, in the event of loading of the carrier pot in both rotation directions as a result of a small thrust loading of the plastics material. Preferably, the layers are constructed symmetrically relative to each other and consequently the angular offset of two adjacent layers is small. As a result of the described structure, induced stresses in the composite are minimized, the loading of the plastics material embedding the fibers is reduced and a high durability of the composite is ensured.
According to a preferred development of the invention, there is provision for the hub ring portion and/or the brake disk ring portion to have at least one securing location for securing to the wheel hub or the brake disk, wherein there is provided at least one additional support fiber which surrounds the respective securing location at least substantially annularly. Consequently, the carrier pot can be connected at the securing location(s) to the brake disk or the wheel hub or rim of a wheel of the vehicle. The respective securing location can be constructed, for example, as a securing opening or as, for example, a stud-like securing projection. The respective securing location is at least substantially annularly surrounded by the additional support fiber. The durability in the region of the securing location is thereby further increased in a selective manner.
Preferably, the support fiber surrounds the respective securing location at least substantially in the manner of a circular ring in order to ensure a uniform load behavior or a uniform force distribution. Furthermore, there is preferably provision for the support fiber to extend, in particular axially, through the layer structure of the fiber composite plastics material during the enclosure of the securing location so that a large portion of the length thereof is perpendicular to the orientation of the fiber layers. In this manner, the composite layers of the carrier pot are reinforced under high loads in the region of the respective securing location by the described axial reinforcement in an ideal manner against delamination and consequently the durability of the respective securing location is improved.
Furthermore, there is preferably provision for the at least one support fiber to surround a plurality of securing locations annularly. Consequently, the support fiber extends annularly around a securing location, from one securing location as far as the next securing location, and also around the next securing location in an annular manner. In this manner, a plurality of securing locations are connected to each other by the support fiber and supported separately, respectively.
Particularly preferably, there is provision for the support fiber to annularly surround alternately a securing location of the brake disk portion and a securing location of the wheel hub portion. Therefore, the support fiber extends between two securing locations in a radially outward direction or in a radially inward direction. Preferably, the securing locations are arranged in this case so as to be offset relative to each other when viewed in a peripheral direction so that the support fiber does not extend precisely in a radially inward direction or in a radially outward direction, but instead extends along a force flow line. The carrier pot is thereby reinforced in a loading direction. In a particularly preferred manner, the support fiber extends over the carrier pot in such a manner that it surrounds all the securing locations at least once in an annular manner. A particularly high level of durability is thereby ensured.
According to a preferred development of the invention, there is provision for the support fiber to be arranged so as to extend between the securing locations along a loading path of the carrier pot so that during operation it is stressed at least substantially only in terms of tension. The loading path is the force path of the loading which may be anticipated and which is produced during operation of the carrier pot in a wheel brake. In this case, the respective loading path extends from a securing location of the wheel hub portion to a securing location of the brake disk portion and accordingly results from the arrangement of the securing locations and the formation of the carrier pot. The loading path can be calculated, for example, wherein in particular a loading path is produced between each securing location which extends radially inwardly in a peripheral direction and which is located radially outwardly. Preferably, the support fiber extends between an internal securing location and an adjacent external securing location which is located so as to be offset relative thereto in a peripheral direction, as already explained above, so that a uniform pattern is produced.
In this case, there is in particular provision for two support fibers or two support fiber portions of one support fiber to intersect in a radial region between the brake disk ring portion and the wheel hub ring portion. It is thereby ensured that the brake pot can be identically loaded in both rotation directions.
In a particularly preferable manner, there is provision for the support fiber to be stitched into the fiber plastics composite. The support fiber can thereby selectively obtain the desired form or the desired extent. The stitching can be carried out with little consumption of time and in a precise manner so that a high level of quality can be achieved. As a result of the stitching of the support fiber, in particular the above-described extent of the support fiber axially through the fiber plastics composite is achieved, that is to say, the introduction of the support fiber composite plastics material through the support fiber. In particular, the stitching is carried out in such a manner that the support fiber is partially stitched on the fiber plastics composite, in particular in the region of the securing locations. The support fiber is therefore stitched on the fiber composite active material by the stitching preferably in addition to an introduction into the fiber composite plastics material in the region of the securing locations or alternatively only on the fiber composite active material. It is particularly advantageous to have a substantially elongate orientation of the support fiber between the particularly adjacent securing locations or the securing locations which follow each other in the row of the support fiber, which ensures an optimum force flow through the at least one support fiber.
The brake disk device according to the invention having the features of claim 10 is distinguished by the construction according to the invention of the carrier pot. The advantages already mentioned are thereby afforded.
Other advantages and preferred features and feature combinations result in particular from what has been described above and the claims.
The invention is intended to be explained in greater detail below with reference to the drawings, in which:
To this end, the brake disk 2 of the brake disk device 1 as shown in
The brake disk 2 is securely connected to a carrier pot 5 which can be secured to a wheel hub or to a rim of a wheel of the vehicle in order to transmit the braking forces to the wheel. In conventional brake disk devices, the carrier pot 5 and the brake disk 2 are produced integrally with each other, for example, by a grey cast iron casting method. In order to reduce the mass of the brake disk device 1, it is now also known to construct the carrier pot 5 and brake disk 2 separately from each other in order to allow advantageous material combinations for the carrier pot 5 and the brake disk 2, in particular for the friction ring of the brake disk 2. In this case, it is also known to use, in addition to grey cast iron, aluminum, steel or silicon carbide ceramic materials. The carrier pot 5 and brake disk 2 are then connected to each other by extremely different connection methods, such as, for example, bolting, screwing or casting.
In the brake disk device 1 shown in
According to the present embodiment, the securing locations 6 are constructed as securing openings which are used to screw, bolt or rivet the carrier pot 5 to the wheel hub or the brake disk 2, respectively. Alternatively, at least some of the securing locations and/or 7 can also be constructed as particularly stud-like projections on the carrier pot 5. The securing locations 6 can also be constructed as pockets, in which a separate securing bolt which axially projects from the carrier pot 5 is cast or formed. The securing locations 6 are preferably constructed in such a manner that they are also protected at high thermal loads by the ventilation holes 4 or similar cooling devices, such as, for example, air gaps of the brake disk, or by using thermally insulating materials in the region of the securing locations 6, such as, for example, ceramic bushes or ceramic coatings.
According to the present embodiment, the carrier pot 5 is produced from a fiber plastics composite which ensures a sufficiently high mechanical and thermal durability with particularly low weight.
In this regard,
As a result of the support fibers 13, consequently, the securing locations 6 and 7 the carrier pot 5 are advantageously supported and the durability of the carrier pot 5 and the brake disk device 1 is thereby generally increased.
As a result of the advantageous construction, both a high level of rigidity and strength of the carrier pot is ensured in the fiber direction under tensile loading with little rigidity of the surrounding plastics matrix and of the fibers of the fiber layers 10, 11, 12 transversely relative to the fiber direction, or pressure loading.
By using the fiber composite plastics material for the carrier pot 5 with in particular quasi-isotropic properties for securing the direction of rotation of the independent strength of the carrier pot 5, the mentioned advantages are achieved. The material of the support fibers 13 and the fibers in the layers 10, 11, and of the plastics material are selected in accordance with the mechanical and thermal requirements. By using the fiber reinforcement which is suitable for laden travel as a result of the support fibers 13 which ideally extend in such a manner that they are loaded only in terms of tension, substantially higher loads can be achieved with little material application. Depending on the selection of the fiber reinforcement which is suitable for laden travel as a result of the support fibers 13, the strength of the carrier pot 5 can also be adjusted in accordance with the direction of rotation.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2016 212 715.2 | Jul 2016 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2017/060641 | 5/4/2017 | WO | 00 |
