DE10234642B4 - Disc brake and thermal insulation device for a disc brake - Google Patents

Abstract

Pneumatically and / or electromotive actuated disc brake for a commercial vehicle, with a) a brake caliper (1) overlapping a brake disc (2), b) at least one application device (4) arranged in the brake caliper (1) for applying at least one brake lining (3) by means of at least one Pressure piece (9) in the direction of the brake disc (2), c) wherein the brake lining (2) has at least one lining carrier (3a) and a lining material (3b), and d) where between the lining carrier (3b) and the pressure element (9) a Thermal insulation device (13) is arranged, e) wherein the thermal insulation device (13) has a thermal insulation layer (14) and a fastening device (15) for fastening the thermal insulation layer (14) to the at least one pressure piece (9), f) wherein the fastening device (15) ) is designed as a pot (16) or a cage, which receives the thermal insulation layer (14) and is attached to the pressure piece (9) by means of positive and / or non-positive locking, g) the pot (16) or cage on its entire circumference or at least in sections on the circumference has a cylindrical jacket (18) which encloses the pressure piece (9) in its disk-shaped area (11) on its periphery wholly or in sections, characterized in thath) the cylindrical jacket (18) at its free , from the facing end facing away from the lining carrier is crimped or pressed inward at its edge and undercuts on the conical area (12) of the pressure piece (9) or is crimped or pressed outward at its edge and is pretensioned against the peripheral edge of the disc-shaped area (11) of the pressure piece sets.

Description

The present invention relates to a pneumatically and / or electromotive actuated disc brake according to the preamble of claim 1 and a thermal insulation device according to the preamble of claim 11.

Disc brakes are known, for example, as sliding caliper disc brakes, swiveling caliper disc brakes or fixed caliper disc brakes.

Sliding caliper brakes require an axially fixed component that carries the brake linings effective on one side of the brake disc and absorbs their circumferential forces when the brake is actuated and holds the brake caliper, which is slidably mounted parallel to the vehicle axis. The relative movement that the brake caliper executes against the axially fixed component can be subdivided into work and wear stroke.

To compensate for brake pad and / or brake disk wear, at least one adjustment device is arranged in the brake caliper, which acts on a brake pad via one or two pressure pieces that are essentially axially displaceable to the brake disk in order to adjust the distance between the brake pad and the brake disk. The brake pad material is connected to the pad carrier, which in turn is either connected to the pressure piece or rests “loosely” on the pad carrier without being connected to it.

For example from the DE 42 30 005 A1 such a disc brake with a sliding caliper is known, in which on each side of the brake disc two pressure pieces arranged next to one another act on a lining carrier of a brake lining which is provided with a lining carrier material.

The disadvantage of the known constructions is that the frictional heat generated during a braking process is passed unhindered through all components of the adjusting device, whereby the downstream functional parts are exposed to a special load which reduces the service life. This is particularly problematic when electric motors are used as drives for the adjustment devices.

Since disc brakes, which are used in commercial vehicles, are subject to the highest stresses, this problem is of particular importance, especially from an economic point of view, since shortened downtimes and the resulting replacement of the corresponding functional parts not only cause repair costs, but also costs due to the necessary Commercial vehicle downtime occurs.

From the DE 39 19 179 A1 a disc brake is known in which on the side of the brake lining facing the pressure piece, a thermal insulation plate is attached to the lining carrier as a thermal insulation device, which reduces the heat flow between the brake lining and the pressure piece. Since a high level of heat is generated on the brake disc and the brake pads during braking, the thermal insulation plate protects the inside of the brake calliper - such as the application unit and the adjustment device - against overheating. This solution can alleviate the problem. In terms of design, however, the solution is not optimal, because it cannot be retrofitted to existing disc brakes, for example.

From the DE 94 10 454 U1 a disc brake is known in which two tappet parts are connected to one another by a protective plate,

From the U.S. 5,988,044 A a brake piston is known, on the front edge of which a metal cap lined with an insulating material is molded.

From the DE 28 45 560 A1 and the U.S. 5,608,967 A Wet-running disc brakes for aircraft wheels are known in which pressure pieces are fitted with a metal cap, with insulating stacks being inserted below the metal cap.

From the DE 33 18 372 A1 a dust cap for an actuating cylinder piston of a disc brake is known. Here a thermal insulation layer lies directly on the carrier plate of a brake bellows

From the US 6 230 851 B1 a disc brake is known in which a pressure piece is directly coupled in a form-fitting manner to the carrier plate of a lining carrier plate.

The present invention is therefore based on the object of further developing a disc brake of the generic type in such a way that a low heat transfer during braking into the interior of the brake caliper is achieved with structurally simple operations, whereby in principle it should also be possible to retrofit given disc brakes with the thermal insulation device.

This object is achieved by the subject matter of claim 1 and the subject matter of claim 11.

Further advantageous developments of the invention are specified in the subclaims.

According to this, the thermal insulation device has a thermal insulation layer and a fastening device for fastening the thermal insulation layer to the at least one pressure piece. The thermal insulation device thus has only a minimal expansion over the area of the pressure pieces and can be easily retrofitted by replacing the pressure pieces or attaching them to existing pressure pieces. Nevertheless, it offers excellent protection for the adjustment and adjustment device against heat convection from the pressure piece into the interior of the brake caliper.

The fastening device is preferably designed in a structurally simple manner as a pot or cage which receives the thermal insulation layer and is fastened to the pressure piece by means of a form fit and / or force fit.

The invention also provides a thermal insulation device with a thermal insulation layer and a fastening device for fastening the thermal insulation layer to the at least one pressure piece of the disc brake.

Embodiments of the invention are described below with reference to the accompanying drawings.

• 1-5 verschiedene Varianten des Druckstückbereiches erfindungsgemäßer Scheibenbremsen,
• 6 einen Schnitt durch eine Scheibenbremse nach dem Stand der Technik.

Show it:

• 1-5 different variants of the pressure piece area of disc brakes according to the invention,
• 6th a section through a disc brake according to the prior art.

6th shows a disc brake as it comes out of the DE 42 30 005 A1 is known. However, the invention is not limited to such pneumatically operated disc brakes with sliding calipers but is also suitable for disc brakes with pivoting or fixed calipers and also for electromechanically operated disc brakes and pneumatically operated disc brakes with electromechanically driven adjustment devices as well as for disc brakes with adjustment devices on each side of the brake disc ( see, for example, WO 02/014 708 A2) because the heat protection devices can be retrofitted to various types of pressure pieces.

In the 6th The disc brake shown has a brake caliper designed as a sliding caliper 1 on that a brake disc 2 includes in its upper peripheral area. An electric motor actuation of the disc brake is also conceivable, but not shown.

On both sides of the brake disc 2 are different brake pads in their direction and away from this, ie perpendicular to their plane 3 arranged in the usual way from a lining carrier 3a and a covering material applied thereon 3b consist.

An application device 4th here by means of a rotary lever 5 via an eccentric 6th on a traverse 7th acts, in which two parallel readjusting spindles 8th are rotatably screwed, each at its the brake disc 2 facing side thrust pads 9 have which on the lining carrier 3 enables the in 6th right brake pad 3 in the direction of the brake disc and about the reaction forces and the displaceability of the brake caliper 1 Relative to a brake carrier also the application of the left brake pad 3 .

The two synchronized readjusting spindles 8th enable a mechanical coupling with the rotary lever 5 and an adjustment device 10 Adjustment of brake pad wear with one-way rotary and overload clutch (not visible here because it is in one of the adjustment spindles 8th housed).

The pressure pieces 9 point here according to 1 one to the lining carrier 3a facing disc-shaped area 11 on and a conically tapering area adjoining this 12th on their side facing away from the lining carrier and finally go into a short bolt-like area here 21st about where the readjusting spindles 8th are attached. On the peripheral edge of the pressure piece is in its bolt-shaped area 21st one end of a bellows 22nd attached, the other end on the inner circumference of openings 23 in the caliper 1 - please refer 1 - or a locking plate of the brake calliper 1 Or the like. Is attached and the interior of the caliper 1 protects against contamination.

Conceivable - but not shown here - would also be a training with a disk-shaped area 11 directly or after another conical area 12th subsequent sleeve or nut-like area, which are screwed onto a bolt. The only important thing in this context is the possibility of changing the distance between the pressure pieces 9 and the traverse 7th or - in more general terms - the possibility of changing the "length" of the adjustment device perpendicular to the brake disc 2 to compensate for lining wear.

According to the invention is on the pressure pieces 9 one thermal insulation device each 13 arranged, which each have an annular thermal insulation layer 14th and a fastening device 15th to Attachment of the thermal insulation layer 14th on the pressure piece 9 having. With the brake of the 6th is the thermal protection device by completely replacing the pressure pieces 9 or - according to some variants - by adding the thermal protection device 13 can be retrofitted.

As in 1 the thermal insulation layer can be seen 14th preferably designed like a disk and has a diameter which is that of the disk-shaped area 11 of the thrust pads 9 corresponds.

Serves as a fastening device after 1 a kind of pot 16 or cage made of sheet metal, which the thermal insulation layer towards the lining carrier with its bottom 17th preferably completely covered and the one on its entire circumference or at least in sections on the circumference a cylindrical jacket 18th has, which the pressure piece 9 - and here in particular its disk-shaped area 11 - borders on its circumference in whole or in sections and the thermal insulation layer 13 can be retrofitted on the pressure piece 9 attached.

This attachment can be done by a force fit and / or form fit.

The attachment through the pot 16 or cage has the advantage that it is designed with a relatively thin thermal barrier coating 14th and a correspondingly thin-walled pot 16 it is even possible to retrofit the thermal insulation device to existing disc brakes.

After 1 the attachment of the pot takes place 16 primarily by a form fit, with the cylindrical jacket 18th at its free end facing away from the lining carrier in the area 26th is crimped or crimped inwards and is attached to the conical area 12th creates so that a pulling off of the pot 16 towards the pressure piece 9 is no longer possible due to the undercut formed as a result.

The pot 16 can be essentially or completely closed in the area of its walls or - according to less preferred variants - be partially perforated.

The thermal insulation device 13 reduces the convection of heat through the pressure pieces in a simple way 9 and thus protects the application device 4th and the adjustment device 10 and there in particular their heat-sensitive parts such as the bellows 22nd , Grease, plastic parts such as potentiometers or the like. To prevent premature wear.

After 2 the attachment of the pot takes place 16 primarily through a frictional connection, the cylindrical jacket 18th is crimped or pressed at its free end facing away from the lining carrier towards the outside at its edge - area 20th - and with bias against the peripheral edge of the disk-shaped area 11 of the pressure piece.

The embodiments of 1 and 2 can also be easily retrofitted to existing brakes, as the pressure piece does not have to be changed. It is even possible to design the thermal insulation device in such a way that existing assembly tools can continue to be used.

The pot 16 takes over on the one hand a fixation and on the other hand a protection of the thermal insulation layer 14th against mechanical damage. One or more openings in the pot 16 On the other hand, it may be advantageous to have a visual inspection of the thermal barrier coating 14th to be able to make.

As a material for the thermal insulation layer 14th In particular, a ceramic is suitable which is selected in such a way that, on the one hand, it allows good thermal insulation and, on the other hand, it allows absorption of the mechanical forces occurring during braking.

With a disc brake like the one after 6th are the thrust pads 9 not with the lining carrier 3a connected, so that no more heat in the pressure pieces during the released state 9 flows. Nevertheless, the disc brake is in principle also suitable for variants in which the pressure pieces 9 with the brake pad 3 are coupled and this when the brake is released from the brake disc 2 withdraw.

After 3 is the disk-shaped area 11 at his from the lining carrier 3a remote area with a ring recess 19th or provided with several recesses distributed around the circumference, into which the outwardly flanged area 20th engages in a latching manner, so that a particularly effective combination of positive and non-positive locking is achieved here.

4th illustrates the option when the thermal insulation layer is formed 14th as a washer not on the outer circumference but inside in the hole area 25th the thermal insulation layer 14th pressing or pressing in the pot 16 to a specialization area 27 to make the pot frictionally on the pressure piece 9 to press.

After 5 the thermal insulation layer is not ring-shaped but “closed” disc-shaped, so that it covers the entire surface in the area of the pressure piece 9 the convection of heat is prevented. The pot 16 has an outer ring attachment here 27 and covers the bellows to the lining carrier 3b protective off.

List of reference symbols

1

Brake caliper

2

Brake disc

3

Brake pads

3a

Lining carrier

3b

Covering material

4th

Brake application

5

Rotary lever

6th

eccentric

7th

traverse

8th

Adjustment spindles

9

Thrust pads

10

Adjusting device

11

disc-shaped area

12

conical area

13

Thermal insulation device

14th

Thermal insulation layer

15th

Fastening device

16

Cage

17th

ground

18th

coat

19th

Ring recess

20th

beaded area

21st

Bolt-shaped area

22nd

Bellows

23

openings

25th

Hole area

26th

Area

27

Specialization area

Claims (11)

Pneumatically and / or electromotive actuated disc brake for a commercial vehicle, with a) a brake caliper (1) overlapping a brake disc (2), b) at least one application device (4) arranged in the brake caliper (1) for applying at least one brake lining (3) by means of at least a pressure piece (9) in the direction of the brake disc (2), c) wherein the brake lining (2) has at least one lining carrier (3a) and a lining material (3b), and d) where between the lining carrier (3b) and the pressure element (9 ) a thermal insulation device (13) is arranged, e) the thermal insulation device (13) having a thermal insulation layer (14) and a fastening device (15) for fastening the thermal insulation layer (14) to the at least one pressure piece (9), f) the fastening device (15) is designed as a pot (16) or as a cage, which receives the thermal insulation layer (14) and is attached to the pressure piece (9) by means of a form fit and / or force fit, g) the pot (16) or cage on has a cylindrical casing (18) on its entire circumference or at least in sections on the circumference, which encloses the pressure piece (9) in its disc-shaped area (11) on its circumference in whole or in sections, characterized in that h) the cylindrical casing (18) adjoins its free end facing away from the lining carrier is crimped or pressed towards the inside at its edge and lies undercutting on the conical area (12) of the pressure piece (9) or is crimped or pressed to the outside at its edge and is pretensioned against the The peripheral edge of the disk-shaped area (11) of the pressure piece sets. Disc brake after Claim 1 , characterized in that the thermal insulation device (13) is dimensioned in such a way that it can be retrofitted to existing disc brakes. Disc brake according to one of the preceding claims, characterized in that the pressure pieces (9) have a disc-shaped area (11) and a conically tapering area (12) adjoining this and a bolt-like area (21). Disc brake according to one of the preceding claims, characterized in that the thermal insulation layer (14) is designed like a disc or ring. Disc brake after Claim 4 , characterized in that the thermal insulation layer (14) has a diameter which corresponds to that of the disk-shaped area (11) of the pressure pieces (9). Disc brake according to one of the preceding claims, characterized in that the pot (16) or cage consists of sheet metal and preferably completely covers the thermal insulation layer (13) towards the lining carrier (3b) with its base (17). Disc brake according to one of the preceding claims, characterized in that the pot (16) or cage is designed to be essentially or completely closed or partially perforated in the region of its walls. Disc brake according to one of the preceding claims, characterized in that the cylindrical casing (18) engages in a latching manner in at least one recess (19) on the pressure piece (9). Disc brake according to one of the preceding Claims 4 to 8th , characterized in that the ring-shaped thermal insulation layer (14) has a hole area (25) into which the bottom (18) of the pot (16) or cage is pressed in order to fasten the pot to the pressure piece (9) in a non-positive manner. Disc brake according to one of the preceding claims, characterized in that the pot (16) has an outer ring shoulder (28) which covers a bellows (22) towards the lining carrier (3b). Thermal insulation device for a disc brake according to the preamble of Claim 1 or according to one of the preceding claims, having a thermal insulation layer (14) and a fastening device (15) for fastening the thermal insulation layer (14) to the at least one pressure piece (9) of the disc brake, the fastening device (15) as a pot (16) or as A cage is formed which receives the thermal insulation layer (14) and can be attached to the pressure piece (9) by means of a form fit and / or force fit, the pot (16) or cage having a cylindrical jacket (18) over its entire circumference or at least in sections on the circumference which encloses the pressure piece (9) in its disc-shaped area (11) on its periphery wholly or in sections, characterized in that the cylindrical jacket (18) at its free end facing away from the lining carrier is crimped or pressed inwards at its edge is and lies undercutting on the conical area (12) of the pressure piece (9) or is crimped or pressed outwards at its edge and lies with pretension against the peripheral edge of the disk-shaped area (11) of the pressure piece.

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