WO2005090815A1

WO2005090815A1 - Brake disc arrangement for a vehicle disc brake

Info

Publication number: WO2005090815A1
Application number: PCT/EP2005/051280
Authority: WO
Inventors: Dirk Koch; Sascha Bonarewitz
Original assignee: Continental Teves Ag & Co. Ohg
Priority date: 2004-03-20
Filing date: 2005-03-18
Publication date: 2005-09-29

Abstract

The invention relates to a brake disc arrangement (1) for a vehicle comprising at least one axle. Said brake disc arrangement (1) comprises a support (3), arranged on a vehicle axle, with several friction rings (2), fixed to the support (3) in the circumferential direction, of which at least one may be displaced axially on the support (3). According to the invention, the friction ring guide may be simplified and improved, whereby at least one guide pin (7) is detachably fixed to the support (3), extending axially through at least one friction ring (2) to provide the same with a displaceable mounting on the support (3). The friction ring guidance by means of guide pins (7) may be rendered flexible and economical with good guidance quality.

Description

Brake disc arrangement of a vehicle disc brake

The invention relates to a brake disk arrangement of a vehicle disk brake which has a plurality of friction rings. At least one of these friction rings is axially slidably mounted within the brake disc assembly.

WO 00/42332 AI describes, for example, a brake disk arrangement of a motor vehicle disk brake with an axially fixed support, on which two friction rings are arranged so as to be non-rotatable in the circumferential direction and to be displaceable in the axial direction. The carrier, together with the friction rings, is coupled to a rotational movement of a vehicle axle. The friction rings interact tribologically with the associated brake pads of a corresponding motor vehicle disc brake. For this purpose, the brake linings are mounted on a brake caliper of the motor vehicle disc brake so as to be displaceable in the axial direction. During a brake application, the friction package consisting of friction rings and brake linings is compressed to achieve the tribological braking effect. Both the brake pads and the friction rings pass through an axial displacement path. In daily brake operation, however, it is extremely difficult to ensure this displaceability for every operating state of the motor vehicle disc brake. This applies in particular to the friction rings in their guides on the carrier. In principle, the occurrence of corrosion and dirt on the friction ring guides can impair the entire braking function.

In addition, DE 101 62 687 AI is another variant of a brake disc arrangement with several friction rings known, which are also guided axially on a carrier. For this purpose, a toothing is formed between the friction rings and the carrier, which is effective as a guide device. The toothing is additionally shielded from the environment by a seal to ensure that the friction ring guide runs smoothly and permanently. However, this type of toothing as a guiding device can only be produced in a complex manner and also requires an expensive seal.

Against this background, the object of the invention is to provide a brake disk arrangement equipped with a plurality of friction rings with at least one axially displaceable friction ring, which has a simply constructed and permanently effective guide device for each displaceable friction ring.

The object is achieved by a brake disk arrangement of a vehicle disk brake with a carrier arranged on a vehicle axle, with a plurality of friction rings connected to the carrier in a circumferentially rotational manner, at least one of which is axially displaceably guided on the carrier, at least one guide pin being detachably fastened to the carrier and which protrudes axially through at least one friction ring in order to be displaceably supported on the carrier. The use of a guide pin or a plurality of guide pins results in a considerable simplification of production for the brake disk arrangement, since guide pins of this type are readily available as inexpensive mass articles and additional machining measures on the carrier can advantageously be omitted. In addition, the type and number of guide bolts used can sufficiently take into account the circumferential load that is present depending on the application. An advantageous variant of the brake disc arrangement is achieved in that the guide pin is surrounded by a protector element which seals the guide pin from the environment. This ensures a permanently smooth friction ring guide. Relatively small protector elements are sufficient, each of which only surrounds the guide pin and does not shield the entire circumference of the carrier. The protector element is preferably arranged between two friction rings, so that the penetration of moisture and dirt into the friction ring or bolt guide is prevented. In this way, the friction ring guide is spared from corrosion and dirt. According to a particularly inexpensive design, the protector element is sensibly designed as a bellows. A suitable design of such a bellows ensures that the friction rings can be moved axially under the action of very low displacement forces. In general, the bellows can advantageously consist either of plastic, in particular a rubber material, or of a metallic material. Alternatively, it is also conceivable to design the protector element as a flexible fabric element, for example as a steel flex hose. Such fabric elements have a higher thermal load capacity.

Another sensible embodiment of the brake disc arrangement results from the fact that the carrier can be designed as a wheel hub. In particular, the wheel hub is non-rotatably connected to the corresponding axle in the case of driven axles or rotatably mounted on the axle in the case of non-driven axles. The friction rings are thus arranged directly on the wheel hub, saving additional components. Circumferential braking forces occurring on the friction rings can thus be dissipated directly via the wheel hub. Alternatively it is possible to carry out the carrier as a wheel bearing component, in particular wheel bearing outer ring, so that additional components can also advantageously be saved in this way. The carrier preferably comprises two flanges, between which at least one displaceable friction ring is arranged. This is a first flange facing the vehicle axle and a second wheel flange for fastening a vehicle wheel. For such an arrangement, it proves to be advantageous to screw the IT guide bolts to one end of each flange. The guide bolts are preferably screwed to the first axle-side flange, which simplifies the releasability of the guide bolts from the wheel side or the vehicle outside. According to a further development of this variant, at least the wheel flange is designed in such a way that friction ring assembly and disassembly is also possible from the outside of the vehicle.

Advantageously, the variants of the brake disc arrangement described can interact with an associated fest as well as with a floating caliper disc brake.

Further useful details of the invention can be found in the exemplary embodiments in the figures and are explained in more detail below.

It shows :

Fig.l shows a brake disc assembly with two friction rings slidably guided by guide pins in a sectional view;

2 shows the brake disc arrangement from FIG. 1 with an associated floating caliper brake in a spatial representation,

3 shows the brake disc arrangement from FIG. 1 with an associated brake pad set, with the omission of a displaceable friction ring.

The brake disk arrangement 1 shown in FIGS. 1-3 with a plurality of axially displaceable friction rings 2 is provided for use in vehicles, in particular motor vehicles, which have at least one vehicle axis. Such a brake disc arrangement 1 interacts with an associated disc brake and is particularly suitable for implementing high braking powers.

Specifically, the brake disc arrangement 1 essentially comprises a carrier 3 arranged on a vehicle axle, which in the present case is designed as a wheel hub 3, and friction rings 2 mounted axially displaceably on the wheel hub 3. It is particularly advantageous to design the carrier 3 as the outer ring of a correspondingly designed one Train wheel bearings. Basically, the wheel hub 3 is non-rotatably connected to a driven vehicle axle and rotatably mounted on the axle in the case of a non-driven axle. The wheel hub 3 is axially delimited by two flanges 4, 5. The first flange 4 faces the vehicle axle and can be used for the driven axles if necessary the wheel hub 3 to be rotatably connected to the vehicle axle, not shown. The second wheel flange 5 faces the wheel side or the outside of the vehicle and serves to fasten a vehicle wheel. For this purpose, depending on the application, a plurality of fastening bores 6 are formed on the wheel flange 5. Furthermore, the flanges 4, 5 limit the axial displacement path of the friction rings 2 ,

For the displaceable arrangement of the friction rings 2 on the wheel hub 3, the brake disk arrangement 1 comprises a plurality of guide bolts 7 which are detachably fastened to the wheel hub 3. Each guide pin 7 projects axially through an associated bore 8 in the friction ring 2. At a first end, each of the guide pins 7 is preferably screwed to the axle-side flange 4 by means of a thread 9. At the opposite second end, each guide pin 7 has a tool holder 10 (e.g. hexagon socket, Torx holder or the like) for attaching an associated screwing tool. With this second end, the guide pin 7 extends into an associated through-hole 11 in the wheel flange 5. As a result, circumferential braking forces occurring on the friction rings 2 during braking operation can be dissipated directly via the wheel hub 3. In addition, the number of guide pins 7 used or the corresponding design of the guide pins 7, z. B. the determination of a suitable bolt diameter, since the extent of the transmitted braking circumferential forces are specifically taken into account. In general, such guide bolts 7 are available as mass components at extremely low cost. In addition, the guide bolts 7 also reduce the machining effort on the R-hub 3, since additional mechanical machining steps to provide a high-quality friction ring guide can be omitted. Furthermore, the guide bolts 7 are through the screw connection in the axle-side flange 4 is advantageously accessible from the wheel side or vehicle outside.

Basically, the guide bolts 7 offer a high quality surface, so that a smooth friction ring guide is provided. In order to ensure smooth friction ring guidance in the long term, each guide pin 7 is surrounded by a protector element 13, which seals the friction ring guide from the surroundings. In particular, this prevents the friction ring guide from being impaired by dirt and moisture or the resulting corrosion phenomena. The protector element 13 is advantageously designed as a bellows 13 which extends over the entire guide length of the guide pin 7 and is thus arranged between the two displaceable friction rings 2. The protector element 13 or the bellows 13 can thus be axially compressed between the friction rings 2. It is advisable to use a bellows 13 with only a few folds, since this allows very low axial displacement forces to be achieved for the friction rings 2. In general, the protector elements 13 assigned to the guide bolts 7 can advantageously be made small and thus take up little space.

The friction rings 2 each have a plurality of projections 12 on their inner circumference, on which the bores 8 for the guide bolts 7 are formed. In principle, it makes sense to orient the number of guide bolts 7 or projections 12 on the number of fastening holes 6 provided for the vehicle wheel. The embodiment of a brake disc arrangement 1 shown in the figures uses four guide bolts 7. This results in a cloverleaf-like design for the wheel flange 5, which also allows the friction ring In the event of maintenance or repairs, ge 2 may be assembled or disassembled from the wheel side. This creates an extremely service-friendly brake disc arrangement 1, which of course can also be modified accordingly in a similar manner to a different number of guide bolts 7 used. The variant of the brake disc arrangement 1 shown in the figures provides solidly designed friction rings 2, which are designed in particular as symmetrically identical standard friction rings 2. This allows inexpensive production of the friction rings 2. Analogously, it is also conceivable to use one or more internally ventilated friction rings within the brake disc arrangement 1.

The mode of operation of the brake disc arrangement 1 in conjunction with an associated disc brake caliper 20 is illustrated on the basis of FIGS. The disc brake caliper 20 overlaps the brake disk arrangement 1 and the associated brake pad set 21, which comprises two external brake pads 22, 23 and a central brake pad 24 arranged between the friction rings 2. Basically, it is alternatively possible to design the disc brake caliper 20 either as a fixed vehicle caliper or as a floating caliper. In the case of a floating saddle 20, as is also shown in FIG. 2, it is axially floating on a component, not shown, which is fixed to the vehicle. The brake pads 22, 23, 24 are either axially displaceable either directly on the disc brake caliper 20 or on a component fixed to the vehicle and, in order to transmit circumferential braking forces, are supported in the circumferential direction. In the present exemplary embodiment according to FIGS. 2-3, the brake linings 22, 23, 24 are displaceably mounted on guide pins 25, which in turn are fastened to the disc brake caliper 20. In particular, the outer brake pads 22, 23 have only one side NEN friction lining 26, while the middle brake lining 24 is provided on both sides with a friction lining 26.

In the course of a brake application, an axial application force is applied to the friction pair formed from the friction rings 2 and the brake pad set 21 via the disc brake caliper 20. As a result of an axial displacement, the brake pads 22, 23, 24 are pressed together with the friction rings 2. The braking performance can be implemented tribologically.

Of course, the brake disc arrangement 1 according to the innovation can also be implemented analogously with more than two Re: 5-bring 2. The number of required brake pads 22, 23, 24 would then also have to be adjusted accordingly.

Claims

claims

1. Brake disc arrangement (1) of a vehicle disc brake, with a carrier (3) arranged on a vehicle axle, with a plurality of friction rings (2) connected to the carrier (3) in a circumferentially rotational manner, at least one of which is guided axially displaceably on the carrier (3) , characterized in that at least one guide pin (7) is detachably fastened to the carrier (3) and axially projects through at least one friction ring (2) so that it can be slidably supported on the carrier (3).

2. Brake disc arrangement (1) according to claim 1, characterized in that the guide pin (7) is surrounded by a protector element (13) which seals the guide pin (7) from the environment.

3. Brake disc arrangement (1) according to claim 2, characterized in that the protector element (13) is arranged between two friction rings (2).

4. Brake disc arrangement (1) according to one of claims 2-3, characterized in that the protector element (13) is designed as a bellows (13).

5. Brake disc arrangement (1) according to one of claims 2-3, characterized in that the protector element (13) is designed as a flexible fabric element.

6. Brake disc arrangement (1) according to one of the preceding claims, characterized in that the carrier (3) is designed as a wheel hub (3) of a vehicle wheel.

7. Brake disc arrangement (1) according to one of the preceding claims, characterized in that the carrier (3) has two flanges (4, 5), between which at least one displaceable friction ring (2) is arranged.

8. Brake disc assembly (1) according to claim 7, characterized in that the guide pin (7) is screwed to a flange (4).