WO2004060732A1

WO2004060732A1 - Disk brake system for automotive vehicles

Info

Publication number: WO2004060732A1
Application number: PCT/BR2003/000187
Authority: WO
Inventors: Jacinto Dorival Santilli; Davi José SANTILLI
Original assignee: Jacinto Dorival Santilli; Santilli Davi Jose
Priority date: 2003-01-02
Filing date: 2003-12-05
Publication date: 2004-07-22
Also published as: AU2003303647A1; BR0300074A; BR0300074B1

Abstract

Improvement introduced for a disk brake system for automotive vehicles characterized by a system comprising a combined arrangement (2) of a fixed brake rotor (3) and a least one axial sliding brake rotor (4) supplemental friction pads (5) between the brake rotors and the braking force being applied by a single caliper (1). The brake rotors can be of the solid disc type or the slotted internal air-cooled disc type.

Description

"IMPROVEMENT INTRODUCED INTO A DISK BRAKE SYSTEM FOR AUTOMOTIVE VEHICLES"

The present report refers to an invention patent dealing with an improvement introduced into a disk brake system of the type largely used in automotive vehicles, as well as in trains, airplanes and others, but that also has applications in other areas, such as in machine tools and others. The proposed improvement consists in introducing, in the conventional embodiment of a disk brake, the concept of a sliding auxiliary disk operating jointly with a supplementary brake pastille.

As widely known, the disk brake systems used, for instance, in automotive vehicles, comprise the use of a disk fixed on or integrated into the wheel cube, having the referred disk brake the characteristic of being solidary to the cube structure.

The brake disk itself is assembled so that its wall passes by a mechanical component usually named as brake tweezer, where the brake pastilles are assembled, whose actuation is made through a hydraulic system and in function of the vehicle's pedal brake actuation.

For short, the brake actuation promotes the brake pastilles approximation, causing them to friction with the disk faces, thus generating the desired braking effect.

The brake disk itself may basically be of two types, simple or double-ventilated; the first type as well defined by terminology, is a single-wall disk in which the brake pastilles contact the two faces of this very wall. The double-ventilated type disk, on its turn, is formed by two walls interconnected by internal walls configuring a means of spacing that promotes the air circulation between the disk walls. The double-ventilated type disk, when compared to the simple disk, displays more favorable characteristics of ideal temperature maintenance, both in the disk itself and in the disk pastilles, as the disk brake system is more efficient when operating in lower temperatures .

Despite the broad use, the conventional disk brake system has some negative points, usually related to the system efficiency when required in extreme conditions, where superheating can easily occur, both in the disk and in the brake pastilles, as well as in the other components related to the set as a whole.

Superheating has as main negative factor a significant loss of efficiency of the system, manifested as loss of braking capability, a phenomenon that ends up influencing the vehicle's behavior, mainly in terms of the time necessary for its deceleration, or else in terms of the distance that it runs before its total immobilization. According to the technique status described above, it characterizes as being one of the objectives of this invention patent to provide an improvement introduced into a disk braking system for automotive vehicles in which such improvement aims at expanding the braking system's basic efficiency without incurring constructively complex and onerous solutions.

It also characterizes as being another objective of this invention patent to provide an improvement introduced into a disk braking system for automotive vehicles allowing the obtainment of a disk brake displaying an efficiency factor significantly higher than that verified in the conventional system. Finally, it is also characterized as one of the objectives of this invention patent to provide an improvement introduced into a disk braking system that can also possibly be used in other applications, for instance, in machine tools and similars. In face of the limitations verified in the technique status and aiming at the objectives described above, the present invention patent was developed, which deals with an improvement introduced into a disk braking system for automotive vehicles, and the improvement herein dealt with will be detailedly described with reference to the drawings listed below, in which:

Figure 1 illustrates a general and partially exploded perspective view of a disk braking system such as that herein proposed; Figure 2 illustrates an exploded perspective view of the brake disk proposed by the present patent; Figure 3 illustrates a schematic view displaying a first embodiment of the disk brake herein deal with, and said view illustrates the positioning of the brake disks in relation to the hydraulic tweezer;

Figure 4 also illustrates a schematic view displaying a second alternative embodiment of the disk brake herein dealt with, and said view illustrates the brake disks positioning in relation to the brake tweezer;

Figure 5 still illustrates a schematic view displaying a third embodiment of the brake disk herein proposed, portraying the use of three brake disks, and said view also illustrates the disks positioning in relation to the brake tweezer;

Figure 6 illustrates a perspective view of a innovative brake pastille that also integrates the present patent; and

Figure 7 illustrates a view of the referred brake pastille, such as indicted by arrow A of Figure

6. As illustrated by the figures listed above, the improvement introduced into the disk brake system for automotive vehicles object of this intention patent is characterized by the fact of introducing, in this type of brake system, the concept of provision of a sliding auxiliary disk in association with a fixed disk, the latter being integral or not to the wheel cube, thus allowing the assembly of a supplementary brake pastille operating between the two disks, that is, operating between the fixed disk and the sliding disk.

In Figure 1, it is schematic illustrated a generic model of a brake tweezer 1, which is represented separately in relation to its assembly structure close to the automotive vehicle axis.

The referred Figure 1 also includes a representation in perspective of a combined arrangement 2 formed between a fixed brake disk 3 and a sliding brake disk 4, and between the two disks 3 and 4 there is a supplementary brake pastille 5, displaying the characteristics of incorporating friction material on its two contact faces .

The supplementary brake pastille 5 operates jointly with the brake pastilles 6, and the latter display a conventional general configuration.

Figure 2, on its turn, illustrates the combined arrangement 2 of brake disks 3 and 4, in which it is represented that the brake disk 3 integrates, in a single part, the cube 7 and also displays a central coupling projection 8, which serves as assembly place for the sliding brake disk 4.

According to the proposed embodiment, the fixed brake disk can both integrate the wheel cube and be of the type that is fixed to the cube through the use of screws .

In the first case, such as that displayed in Figure 2, and also according to the proposed project, the coupling projection 8 can integrate, jointly with the wheel cube 7 and the fixed disk 3, a single part, and., it is not discarded the possibility that, alternatively, the set formed by the cube 7 and the brake disk 3 can receive the assembly, separately, of the coupling projection 8, which can be fixed by screws or other mechanical means.

Another alternative of the present patent may contemplate that the brake disk to be assembled against the referred cube can incorporate, in an integral way, the coupling projection 8.

Regardless of the configuration adopted, the coupling projection 8 has the function of receiving the assembly of a brake disk, which although cannot rotate in relation to said coupling projection may display axial displacement movement in relation it, reason for which it is referred to as sliding brake disk.

The coupling projection 8 displays a salience pattern 9a along its contour wall 9, which display a design allowing fitting with indentations 10 produced at the circular opening edge 11 of the sliding brake disk 4. The configuration and number of saliences 9a, as well as of indentations 10, illustrated in the present patent must be considered as non-limitative examples, inasmuch as both the shape and the number of such details may vary according to other project parameters.

The proposed embodiment allows the sliding brake disk 4 to display axial displacement movement in relation to the coupling projection 8; however, it prevents this same brake disk 4 of displaying possibility of rotation in relation to the mentioned coupling projection. The embodiment concept related to the provision of a fixed brake disk and another sliding one makes it possible that between them it be assembled, at the brake tweezer 1, the supplementary brake pastille 5, which can be such as illustrated in Figures 1, 2, 3, 4 and 5, having a simple central core 5a, or it can be of the ventilated type, such as specifically illustrated in Figures 6 and 7.

The supplementary brake pastille 5 avoids the conventional configuration of such component, inasmuch as its core 5a receives friction material 5b on its two faces, thus allowing that it operates between two brake disks.

The supplementary pastille 5 portrayed in Figures 6 and 7, on its turn, displays a different embodiment, in which it is contemplated a double core structure 5a' , formed by two lateral walls 5a' ' interconnected by spacing structures 5a' ' , which can be, for instance, analogous to that verified in the D double- ventilated type brake disks, thus providing an ideal means for air circulation inside the double core structure 5a' , which operates in the cooling of friction material 5b of each one of its two faces .

Thus, when the tweezer' s hydraulic means starts operating, they promote the compression of the set formed by the disks and pastilles, so that the brake pastille 6 positioned beside the sliding disk 4 contacts it, causing it to contact the corresponding face of the supplementary brake pastille 5.

On its turn, the supplementary brake pastille 5 contacts the fixed brake disk 3, and the latter, on its opposite face, contacts the other brake pastille 6, thus starting the braking operation. The embodiment herein dealt with also allows a series of combinations in relation to the type of disk used, that is, if of the simple type, indicated by the reference S, or if of the double-ventilated type, indicated by the reference D, as noticed through the observation of Figures 1, 2 and 4, in relation to Figure 3.

In Figures 1, 2 and 4 a configuration is illustrated in which the fixed disk 3 is a D double-ventilated type disk, while the sliding disk 4 is an S simple type disk. In Figure 3, on its turn, both the fixed disk 3 and the sliding disk 4 are two D double- ventilated type disks.

Within this context, other combinations are perfectly possible too, such as, for instance, the employment of simple disks as fixed disks and as sliding disks too (a combination not illustrated) , or also the combination totally inverse to that displayed in Figures 1, 2 and 4, in which the fixed disk is an S simple disk and the sliding disk is a D double-ventilated disk (a combination not illustrated either) .

The proposed embodiment also allows other combinations in terms of numbers of disks employed, and it can be particularly contemplated a configuration (not illustrated) employing three brake disks, in which one will be of the fixed type and the others of the sliding type, and the addition of a third disk also involves the need of another supplementary brake pastille.

The merit of the embodiment herein dealt with is in the fact of contemplating a series of technical applications that allow that two or more disks, separately, operate jointly within the same brake tweezer 1.

Such merit, more than a mere addition of an extra disk and of a supplementary brake pastille, represents and advancement in relation to the brake systems currently used, inasmuch as it does not alter the operation general philosophy bases of these systems and allows an efficiency significant increment.

The disk brake herein dealt with seems to be suitable, when destined to the automotive segment, for vehicles that must be used in extreme conditions of cargo or performance.

Thus, the proposed disk brake can have applications both in cargo transport vehicles in general (medium- and large-size) and in passenger transport vehicles (medium- and large-size) .

The proposed brake can also be used, in the automotive segment, as an item to equip competition or high performance vehicles.

In any of the types of use mentioned above, the brake system is usually submitted to strict requirement indexes, even if due to different reasons, and in such cases it is desirable to be able to count on a brake system that can display a proportionally higher braking efficiency, and which for such reason ends up being required to a lesser degree, a fact which provides evident advantages in terms of the system security and durability.

In other words, the proposed disk brake higher efficiency enables it to operate with a braking potential reserved not verified in conventional braking systems, a characteristic which consequently reduces the superheating occurrence possibility, even during more intense requirements.

The disk braking system herein dealt with, although primarily destined to the automotive segment, can represent other uses, such as, for instance, as braking element in machine tools that already use conventional disk brake systems, or also in any other applications employing disk brake conventional systems.

Claims

1. "IMPROVEMENT INTRODUCED INTO A DISK BRAKE SYSTEM FOR AUTOMOTIVE VEHICLES" characterized by the fact of contemplated a system in which it is defined a combined arrangement (1) formed between a fixed brake disk (3) and at least one sliding brake disk (4) , and between both disks (3) and (4) there is a supplementary brake pastille (5) ; the sliding disk may be of the simple type or of the double-ventilated type.

2. "IMPROVEMENT INTRODUCED

INTO A DISK BRAKE SYSTEM FOR AUTOMOTIVE VEHICLES", as claimed in 1 above, characterized by the fact that the supplementary brake pastille (5) incorporates, in its core (5a), friction material (5b) on both of its contact faces.

3. "IMPROVEMENT INTRODUCED

INTO A DISK BRAKE SYSTEM FOR AUTOMOTIVE VEHICLES", as claimed in 1 above, characterized by the fact that the combined arrangement (2) of brake disks (3) and (4) comprises that the brake disk (3) can integrate, in a single piece, the cube (7) , and also display a coupling central projection (8) , which serves as assembly place for at least one sliding brake disk (4) .

4. "IMPROVEMENT INTRODUCED INTO A DISK BRAKE SYSTEM FOR AUTOMOTIVE VEHICLES", as claimed in 1 above, characterized by the fact that the fixed brake disk can be of the type fixed to the cube by means of screws .

5. "IMPROVEMENT INTRODUCED INTO A DISK BRAKE SYSTEM FOR AUTOMOTIVE VEHICLES", as claimed in 3 and 5, characterized by the fact that the coupling projection (8) can be assembled separately from the fixed disk (3) and from the cube (7) .

6. "IMPROVEMENT INTRODUCED

INTO A DISK BRAKE SYSTEM FOR AUTOMOTIVE VEHICLES", as claimed in 3 above, characterized by the fact that the brake disk to be assembled against the referred cube incorporates, integrally, the coupling projection (8) .

7. "IMPROVEMENT INTRODUCED

INTO A DISK BRAKE SYSTEM FOR AUTOMOTIVE VEHICLES", as claimed in 3 above, characterized by the fact that the coupling projection (8) receives the assembly of a brake disk, which although cannot rotate in relation to said coupling projection, can display axial displacement movement in relation to it.

8. "IMPROVEMENT INTRODUCED INTO A DISK BRAKE SYSTEM FOR AUTOMOTIVE VEHICLES", as claimed in 3 and 7 above, characterized by the fact that the coupling projection (8) displays a salience pattern (9a) along its contour wall (9) , which display a fitting design with indentures (10) produced on the circular opening edge (11) of one or more sliding brake disks (4) .

9. "IMPROVEMENT INTRODUCED INTO A DISK BRAKE SYSTEM FOR AUTOMOTIVE VEHICLES", as claimed in 8 above, characterized by the fact that the sliding brake disk (4) , when assembled on the coupling projection (8) , displays an axial displacement movement in relation to the referred coupling projection (8) ; however, it cannot rotate in relation to the mentioned coupling projection.

10. "IMPROVEMENT INTRODUCED INTO A DISK BRAKE SYSTEM FOR AUTOMOTIVE VEHICLES", as claimed in 2 above, characterized by the fact that the supplementary pastille (5) can display a double core structure (5a'), which is formed by two lateral walls

(5a''), interconnected by spacing structures (5a'''), thus providing and air circulation means inside the double core structure (5a'), operating in the cooling of friction material (5b) of each one of its two faces.