WO2017036766A1

WO2017036766A1 - Arrangement for a disc brake, brake lining for such an arrangement, and disc brake with such an arrangement

Info

Publication number: WO2017036766A1
Application number: PCT/EP2016/069208
Authority: WO
Inventors: Christian Ritzer
Original assignee: Knorr-Bremse Systeme für Nutzfahrzeuge GmbH
Priority date: 2015-08-31
Filing date: 2016-08-12
Publication date: 2017-03-09
Also published as: DE102015114441B4; DE102015114441A1

Abstract

An arrangement for a disc brake (1), with one or more brake linings (3a, 3b) and a brake disc (2), wherein the at least one brake lining (3a, 3b) has a lining carrier plate (4a, 4b) and a lining body (5a, 5b), is distinguished by the fact that the at least one brake lining (3a, 3b) is designed and connected to a compressed-air source in such a way that compressed air can be pressed therethrough onto the brake disc (2) in order to release said brake lining from the brake disc (2) when releasing the disc brake after braking operations.

Description

ARRANGEMENT FOR A DISC BRAKE, BRAKE PAD FOR ONE

ARRANGEMENT, AND DISC BRAKES WITH SUCH AN ARRANGEMENT

The present invention relates to an arrangement for a disc brake, in particular for a vehicle, according to the preamble of claim 1 and a brake pad.

Such arrangements for disc brakes for vehicles are known from the prior art. Disc brakes generate a so-called residual grinding torque in the unactuated state, which leads to a fuel consumption of, for example, 0.5 to 1% in a vehicle. In order to reduce this effect, solution concepts are known from the prior art, which use mechanical springs or similar elements. This raises the problem of accurate centering when releasing the brake caliper of the disc brake, especially in a disc brake with sliding caliper, so that the small constructive air gap of usually 0.5 to 1, 2 mm sufficient to lift both brake pads safely from the brake disc. In addition, a positioning of the caliper should take into account an oblique wear of the brake pads. In addition, a sensing of the caliper position and a control of the caliper position due to a then relevant, complex component tolerance chain are difficult. Against this background, the invention has the task of going another way to reduce the residual grinding torque.

The present invention solves this problem by the subject matter of claim 1. In addition, the invention provides the brake pad of claim 1 1. It also provides a disc brake with an arrangement according to one of claims 1 to 10.

According to the characteristic of claim 1, the invention provides that the at least one brake lining is configured in such a way and attached to a compressed air source. It can be concluded that compressed air can be pressed onto the brake disk by the driver in order to release it from the brake disk when the disk brake is released during / after braking. As a result, a - possibly complementary - effect to cancel a residual grinding torque is achieved exactly on the friction surface of the brake pad, if this still touches the brake disc after completion of the actual braking operation. The arrangement is particularly well suited for air-operated brakes on which a compressed air supply line is already provided. Preferably, a control device for the brake is further designed and extended in such a way and adapted to control corresponding valve or a plurality of valves, that upon release of the brake, the air is passed through the brake pad. If necessary, the compressed air interacts with other effects or devices, such as with a release spring or loose shaking by the effects of driving.

The invention can be implemented in a simple constructive manner in that the at least one brake lining has at least one first opening or several openings passing through it as one or more channels through which compressed air can be conducted onto the brake disk after the disc brake has been released.

In a preferred embodiment of the invention, the channel is a kind of hose or pipe piece, which is set as a separate component on or in the brake pad. As a result, the assembly effort for producing a corresponding compressed air supply line can be reduced in an advantageous manner.

In a further preferred embodiment of the invention, the separate component, which forms the first opening or the channel in the brake lining, is made of a material which wears out during braking together with the lining body. This ensures in an advantageous manner that the function of the brake pad is always given even when using a separate component for the realization of the opening or the channel.

It is also conceivable for the one opening or the one channel to branch off from a compressed air connection in the interior of the brake lining and to open into a plurality of outlet openings, so that air must be pressed in only at one connection but distributed in the gap at many outlet openings brake disc pressed into the gap so as to release the lining after braking. Such a variant makes it possible to produce an air film between the brake pad and the brake disc, which lifts the Beklag with the release of the brake disc. In another variant of the invention, the lining body is porous in such a way that air can be pressed through it between the brake body of the brake lining and the brake disk. As a result, the functionality according to the invention of an air bearing can be produced particularly simply and thus advantageously without having to change the geometry of the lining body and thus the tool for its manufacture.

Further advantageous embodiments of the invention can be found in the remaining subclaims. Embodiments of the subject invention are illustrated in the drawings and will be described in more detail below. It shows:

Figure 1: a schematic representation of an arrangement for a disc brake with two brake pads and a brake disc.

In Fig. 1, a (for example, ventilated) brake disc 2 for a disc brake according to the invention 1 with both sides of the brake disc arranged brake pads 3a, 3b shown, which are perpendicular to this relatively movable. The brake disk rotation axis X is perpendicular to the surface of the brake disk. The brake pads and the brake disc are delivered in parallel to the brake disc rotation axis X during braking relative to each other. A brake caliper, possibly a brake carrier and an application device for applying (and releasing) the brake are not shown here. Preferably, the disc brake is compressed air actuated and therefore connected to a compressed air supply system with a compressed air source sen.

The two brake pads 3a, 3b are designed differently in the upper and lower regions to represent a total of four possible variants of the invention, but which can also be combined with each other. Each brake lining 3a, 3b has a lining carrier plate 4a and a lining body 5a. The pad body 5a is made of a friction lining material. The lining carrier plate 4a and the lining body 5a are firmly connected to each other.

The pad body 5a is in braking with a friction surface 6a in contact with the brake disc 2, so that it exerts a braking effect on the brake disc 2 and thus to a vehicle in total. The required normal force, which is exerted on the lining body 5a via the lining carrier plate 4a, is generated in the disk brake 1 by a tightening device (not shown here), which is preferably pneumatically actuated. Alternatively, other principles of action, such as e.g. Electro-mechanics or hydraulics possible to operate the application device. But then a separate air reservoir or a separate compressed air source must be provided.

In order to increase the braking effect and reduce the resulting forces acting on adjacent components, usually two of the brake pads 3a, 3b act in opposite directions on the brake disc 2. In this case, the caliper may be a slidably guided on a brake carrier sliding caliper but also a Fixed caliper or a swivel saddle.

Each brake lining 3a, 3b has at least one or more openings 7a, 7b, 11a, 11b which penetrate it and which are / are connected to a compressed air source, so that through the opening or the openings 7a, 7b, 1 1 a, 1 1 b air between the brake pad 3a, 3b and the brake disc 2 can be pressed. On the lining carrier plate 4b, in the region of the respective opening (s) 7a, 7b, 11a, 11b, respectively, a device, in particular a nozzle, for connecting a hose or the like may be formed. In this case, the brake lining 3a, 3b is preferably penetrated completely parallel to the axis of rotation X by the opening or openings 7a, 7b, 11a, 11b.

The brake pad on the left in FIG. 1 has a lining carrier plate 4b and the lining material or the lining body 5b passing directly in the manner of a channel 8b. tion, which is formed without a hose or the like. Directly in the lining body 5b.

The right in Fig. 1 first brake lining 3a has - here by way of example in the edge region - also at least one opening 7a, which is formed in the manner of a channel 8a, which is formed by a separate component, such as a hose or a pipe, the or is set in the brake pad 3a. The first opening 7a is connected to a supply line 9a, via which compressed air can be passed from a compressed air source (not shown) via the first opening 7a into the channel 8a. The tube can also be set or arranged on the edge of the brake pad.

The openings 7a, 7b preferably have a circular cross-sectional geometry whose diameter is constant. He can also change in the direction of X.

As a result of the at least one opening 7a, 7b or the channel 8a, 8b, when the disc brake 1 is released-that is, during the unloading of the application device-an air flow is conducted onto the brake disc 2. The air flow generates a pulse, with the reaction force of which the brake lining 3a is at least locally detached from the brake disk 2.

The (first right in FIG. 1) brake pad 3a has in the lower part of a second opening 10a, which is formed as a channel 12 which completely passes through the brake pad 3a in the direction X. This may be provided in addition to or alternatively to the first opening 8a. By a supply line 14a, in turn, the compressed air can be pressed into the gap between the brake body and the brake disc.

The channel 12a widens in the feed direction of the brake lining 3a in the lining body 5a to a cavity 13, which in cooperation with the brake disc 2 and the loading of the channel 12a and the cavity 13 with compressed air to a

Chamber of an aerostatic air bearing is. With the supplied compressed air, an air cushion is at least briefly generated in the region of the chamber, through which the brake pad 3a is released from the brake disc 2. The second opening 10a preferably has a circular cross-sectional geometry whose diameter widens in the course of the channel 12 in the application direction of the brake lining 3a to the cavity 13. Alternatively, cross-sectional geometries deviating from the circular shape of the second opening 10a or of the channel 12 are also possible. If the second opening 10a or the channel 12 is realized by a separate component, which is integrated in the lining carrier plate 4a and the lining body 5a, the separate component that the second opening 10a and the channel 12 and the cavity 13 is formed , preferably made of a material which wears with the lining body 5a, so that the brake disc-side mouth of the cavity 13 always bears against the friction surface 6a.

Again, through the opening 10a and the channel 12 when releasing the disc brake 1 -also when relieving the Zuspanneinrichtung- an air flow to the brake disc 2 is performed. The air flow generates, at least temporarily, an air cushion with whose reaction force the brake lining 3a is released from the brake disk 2.

The compressed air or pneumatic energy required for the above-described functionality may e.g. be removed from the compressed air supply of a pneumatic brake system or it is from the release of the disc brake 1 from a pneumatic actuator of the application mechanism such. used a pneumatic brake cylinder anyway air to be dispensed.

The brake pad 3b has no cavity 13 in its lower part. The design required for the functionality of an air bearing is realized in the case of the brake lining 3b by a porous lining body 5b, so that the entire friction surface 6b of the lining body 5b acts in an advantageous manner as the effective surface of an air bearing. With the supplied compressed air, an air cushion is at least briefly generated over the entire friction surface 6b, by the brake pad 3b is released from the brake disc 2. The term "porous" here means that the lining body 5b has the required frictional properties of a lining suitable for braking pad body for the brake pad of a disc brake, but is designed so that the pad body 5b is permeable to air. Deviating from the brake lining 3a, the brake lining 3b also has a seal 14 on the free sides of the lining body 5b. The seal 14 prevents air from flowing out on the free side surfaces of the pad body 5b when compressed air is applied to the second opening 10b. The seal 14 is made of a material that wears with the pad body 5b, so that the seal 14 always ends at the friction surface 6b, thus achieving an optimum sealing of the side surfaces of the pad body 5b, which is required for the proper functioning of the air bearing.

LIST OF REFERENCE NUMBERS

1 disc brake

2 brake disc

3a, 3b brake pad

4a, 4b lining carrier plate

5a, 5b lining body

6a, 6b friction surface

7a, 7b opening

8a, 8b channel

9a, 9b supply line

10a, 10b opening

1 1 a, 1 1 b supply line

12 channel

13 cavity

14 seal

X axis of rotation

Claims

claims

1 . Arrangement for a disc brake (1), with one or more brake linings (3a, 3b) and a brake disc (2), wherein the at least one brake pad (3a,

3b) has a lining carrier plate (4a, 4b) and a lining body (5a, 5b), characterized in that the at least one brake lining (3a, 3b) is designed and connected to a compressed air source such that compressed air is supplied to the brake disk (2 ) can be pressed to release it from the brake disc (2) when the disc brake is released during / after braking.

2. Arrangement according to claim 1, characterized in that the at least one brake pad (3a, 3b) has at least one first opening passing through it (7a, 7b) or more such openings through which upon release of the disc brake (1) compressed air on the Brake disc (2) is passed.

3. Arrangement according to claim 2, characterized in that the at least one opening (7a, 7b) as a channel (8a, 8b) is formed, which extends through the lining carrier plate (4a, 4b) and the lining body (5a, 5b) ,

4. Arrangement according to claim 2 or 3, characterized in that the channel (8a, 8b) is formed by a hose or pipe piece, which is set as a separate component on or in the brake pad (3a, 3b).

5. Arrangement according to one of the preceding claims, characterized in that the separate component which forms the channel (8a, 8b), is made of a material which wears during braking together with the lining body (5a, 5b).

6. Arrangement according to one of the preceding claims, characterized in that the diameter of the channel (8a, 8b) is selected such that when releasing the brake when pressing in compressed air, an air cushion is formed, which supports the lining in releasing it brake disc supportive ,

7. Arrangement according to one of the preceding claims, characterized in that on the lining carrier plate (4a, 4b) in the region of the one or more openings) (7a, 7b, 1 1 a, 1 1 b) each have a device, in particular a nozzle, for connecting a hose or pipe or the like. Is designed for connection to the compressed air source.

8. Arrangement according to one of the preceding claims, characterized in that the lining body (5b) is so porous that with the compressed air source through it compressed air can be pressed onto the brake disc.

Has 9. Arrangement according to claim 8, characterized in that the lining body (5b) on its not at braking applied to the brake disc free side surfaces in sections or circumferentially a seal (14).

10.Anordnung according to claim 9, characterized in that the seal (14) is made of a material which wears during braking with the lining body (5b).

1 1. Brake pad (3a, 3b) for an arrangement according to one of the preceding claims, characterized in that it is designed such that through it

Compressed air on the brake disc (2) can be pressed to release it in a release of the disc brake during / after braking from the brake disc.

12. Brake lining according to claim 1 1, characterized in that the at least one brake pad (3a, 3b) at least one first opening passing through it (7a,

7b) or a plurality of such openings, through which after releasing the disc brake (1) compressed air is passed to the brake disc (2).

13. Brake lining according to claim 1 1 or 12, characterized in that the at least one opening (7a, 7b) as a channel (8a, 8b) is formed by the lining carrier plate (4a, 4b) and the lining body (5a 5b).

14. Brake pad (1) according to claim 1 1, 12 or 13, characterized in that the channel (8a, 8b) is formed by a pipe or hose piece, which is set as a separate component or in the brake pad (3a, 3b) is.

15. Brake pad (1) according to any one of the preceding claims 10 to 14, characterized in that the separate component that forms the channel (8a, 8b), is made of a material which during braking together with the lining body (5a, 5b ) wears out.

16. Brake lining according to one of the preceding claims 10 to 15, characterized in that the lining body (5b) is so porous that with the compressed air source through it compressed air can be pressed onto the brake disc.

17. Brake lining according to claim 16, characterized in that the lining body (5b) has a seal (14) in sections on its brake pads not lying on the brake discs at free or lateral surfaces.

18. Disc brake with at least one arrangement according to one of claims 1 to 10.