DE102016109001A1

DE102016109001A1 - Disc brake for a commercial vehicle

Info

Publication number: DE102016109001A1
Application number: DE102016109001.8A
Authority: DE
Inventors: Alexander Asen
Original assignee: Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Current assignee: Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Priority date: 2016-05-17
Filing date: 2016-05-17
Publication date: 2017-11-23
Also published as: WO2017198407A1

Abstract

A disc brake for a commercial vehicle, comprising a brake caliper (1) which engages over a brake disc (2) and is axially displaceable relative to the brake disc (2) by means of at least one guide spar (9) on a stationary brake carrier (3) the guide rail (9) fastened to the brake carrier (3) is guided in at least one slide bush (7) which is held axially secured by at least one molded-on protuberance (14) formed in a recess of a bearing bore (12) of the brake caliper (1) , Is formed so that the at least one protuberance (14) has a circumferentially radially oriented side wall.

Description

The invention relates to a disc brake for a commercial vehicle according to the preamble of claim 1.
The caliper of a disc brake, in particular a sliding caliper disc brake, serves to receive functional parts, such as an application device, which is arranged in a receiving space of the brake caliper which can be closed by a closure cap.
A known application device has a pneumatically or electromotively operable brake lever, which acts on actuation of a bridge which is slidably mounted in the brake caliper and are positioned in the adjusting spindles, by means of which a zuspannseitiger brake pad against a vehicle-side brake disc can be pressed.
For displacement in the axial direction of the brake disk of the caliper is mounted on at least one guide rail, preferably on two, which are connected to a stationary brake carrier. The guide rails are slidably guided in sliding bushes, which are held verschiebegesichert in bearing bores of the caliper, so that the combination guide rail / bushing each form a plain bearing.
One of the plain bearings is designed as a floating bearing and the other as a fixed bearing, wherein the floating bearing a greater radial clearance, in particular to compensate for manufacturing tolerances, has as the fixed bearing.
For an optimized sliding of the caliper on the guide rails, the sliding bushes are made of a suitable plain bearing material, such as brass, bronze or the like.
The mentioned axial displacement protection of the sliding bushing in the bearing bore of the caliper is achieved by a form fit by at least one outer side protuberance of the sliding bush projects into a recess of the bearing bore.
This recess is formed as a circumferential groove, in which engages the bulge produced by revolving rolling of the sliding bushing.
Since the plain bearing material, so called non-ferrous metal, is relatively expensive, instead of one, almost over the entire length of the bearing bore extending bushing two sliding bushings are used, which are spaced apart and shorter in their added length are shorter than said single slide bushing. D. h., The use of materials is significantly reduced when using two sliding bushes in the bearing bore.
However, a circumferential curling of the two sliding bushes is problematic in terms of manufacturing technology, especially since the circumferential groove assigned to a sliding bush can be introduced during casting of the brake caliper made of cast iron, while the circumferential groove assigned to the second sliding bushing has to be introduced by machining.
Due to the relatively low depth of curving of about 0.26 mm and the resulting delicate processing, it is not possible to edit both sliding bushes simultaneously in a rolling process, resulting in obvious cost disadvantages.
In order to achieve a cost reduction here, the positive connection is produced by caulking the sliding bushes in correspondence with the grooves, for which caulking punches are used with which material of the sliding bushing is pressed into the groove of the bearing bore.
As tools find this stamp use, with a conical head which engages the inner surface of the respective sliding bush and urges the material into the circumferential groove of the bearing bore. In this case, distributed over the circumference, for example, three punches are used.
A disadvantage, however, is that forms by the conical shape of the punch head on the inside of the slide bushing in the edge region of the protuberance during caulking a bead which projects beyond the inner surface of the slide bushing.
In order to obtain a smooth sliding surface of the Gleitbuchse so far, therefore, an axial groove or countersink is introduced into the slide bushing, which is deeper by the height of the bead against the sliding surface of the sliding bushing. Since the introduction of such a groove or countersinking is associated with a cost optimization which is always aimed at counteracting costs, the known type of anti-displacement of the sliding bushing in the bearing bore represents an unsatisfactory solution.
The invention has for its object to further develop a disc brake of the generic type so that it is easier and less expensive to produce.
This object is achieved by a disc brake with the features of claim 1.
As has surprisingly been found by the inventive design of the Protuberances, namely such that the protuberance has a circumferentially radially oriented side wall, prevents the formation of the bead described in the prior art in the edge region during caulking.
If a cylindrical stamper is used for caulking, then the protuberance forms cylindrical in shape, with a closed bottom, so that the protuberance in the sense of a cylindrical pin protrudes into the circumferential groove of the bearing bore, wherein the width the groove preferably corresponds approximately to the outer diameter of the protuberance.
In principle, other geometric shapes of the protuberance are also conceivable, for example with a rectangular or non-circular inner and outer cross-sectional contour.
Instead of a circumferential groove of the bearing bore wells adapted to the protuberance may be provided in their peripheral contour, which are introduced, for example, when casting the caliper equal. Although for the positionally accurate positioning of the stamp appropriate setup measures are required to ensure a congruent arrangement of the stamp to the wells, this constructive modification represents an alternative that is advantageous in that it also an anti-rotation of the sliding bush is achieved.
Further advantageous embodiments of the invention are characterized in the subclaims.
An embodiment of the invention will be described below with reference to the accompanying drawings.
Show it:
1 a disc brake according to the prior art in a partially sectioned plan view
2 a detail of a disc brake according to the invention in a sectional side view
3 and 4 in each case a partial section corresponding to the indication III in 2 in different functional positions.
In the 1 a disc brake for a commercial vehicle is shown in the prior art, with a brake disc 2 overarching, consisting of cast iron caliper 1 , which has two plain bearings, one of which as a fixed bearing 5 and the other as a floating camp 6 is formed, based on the brake disc 2 , Is mounted axially displaceable.
In the caliper 1 is an application device 8th arranged, by means of the brake pads during braking 4 on both sides of the brake disc 2 can be pressed.
The two plain bearings, so the fixed bearing 5 and the floating bearing 6 , each have a sliding bushing 7 on, which is secured against displacement in the caliper 1 are stored and the one from the brake caliper 1 consist of different material, usually a non-ferrous metal with appropriate sliding properties.
In every sliding bush 7 is a guide rail 9 Slidably guided, by means of a screw 10 on a stationary brake carrier 3 is attached.
For holding the sliding bush 7 of the fixed camp 5 points the caliper 1 a molded neck 11 on, so as to take up loads occurring sufficient length dimensioning of the fixed bearing 5 to obtain.
In the 2 is as a detail of a disc brake according to the invention, the fixed bearing 5 shown in the two spaced apart sliding bushes 7 in a bearing bore 12 are held. Both the 2 as well as the 3 , which is a partial section of the fixed camp 5 according to the line III in 2 reproduce, show the sliding bushes 7 before a final assembly, like the 4 clarified and after the sliding bushes 7 displaced in the bearing bore 12 are held. In the 3 and 4 in each case only one of the two sliding bushes is shown. The second sliding bush 7 is in the same way, according to the invention, secured against displacement with the neck 11 connected.
Incidentally, the number and arrangement of the sliding bushes 7 to be seen as an example. Of course, the number of sliding bushes 7 deviate from it, ie, it can have several sliding bushes 7 or only one, as in the prior art, be provided. Also the floating bearing 6 can work in the same way with the bushings 7 be equipped.
Each of the sliding bushes 7 In the embodiment, a circumferential groove 13 assigned to the bearing bore 12 is introduced, for example, during casting and / or by mechanical, ie machining.
To prevent shifting is the slide bushing 7 , whose inner lateral surface with wells 16 is provided for receiving grease, partially deformed such that a protuberance 14 in the recess forming a groove 13 intervenes, what a in the 3 recognizable stamp 15 is used, which by radial feed in the direction of arrow the protuberance 14 expresses. According to the invention, the respective protuberance 14 a circumferentially radially oriented side wall, ie, the protuberance 14 is characterized in the example in the sense of a trained as a blind hole cylinder pin, as in the 4 clearly. This is the stamp 15 configured accordingly and also designed cylindrical.
In principle, another outer contour of the protuberance is also conceivable 14 , So not cylindrical, but out of round or angular, but in any case with a circumferentially radially oriented side wall, which preferably frictionally engaged on the opposite side walls of the groove 13 is applied, whereby an anti-rotation is achieved.
Although in principle sufficient to prevent displacement training a protuberance 14 out, however, preferably come several, engaging in the groove protuberances 14 used, which are preferably arranged at equal angular distance from each other.
LIST OF REFERENCE NUMBERS

1: caliper
2: brake disc
3: brake carrier
4: brake lining
5: fixed bearing
6: movable bearing
7: bush
8th: application device
9: Handlebar
10: screw
11: Support
12: bearing bore
13: groove
14: protuberance
15: stamp
16: wells

Claims

Disc brake for a utility vehicle, with a vehicle-side brake disc ( 2 ) cross caliper ( 1 ), which, based on the brake disc ( 2 ), by means of at least one guide rail ( 9 ) axially displaceable on a stationary brake carrier ( 3 ) is held, wherein the on the brake carrier ( 3 ) fixed guide rail ( 9 ) in at least one sliding bush ( 7 ) is guided by at least one molded, in a recess of a bearing bore ( 12 ) of the caliper ( 1 ) engaging molded protuberance ( 14 ) is held axially secured, characterized in that the at least one protuberance ( 14 ) has a circumferentially radially oriented side wall.
Disc brake according to claim 1, characterized in that the protuberance ( 14 ) into the circumferential groove ( 13 ) engages trained recess.
Disc brake according to claim 1 or 2, characterized in that the protuberance ( 14 ) rests positively and frictionally in the recess.
Disc brake according to one of the preceding claims, characterized in that the protuberance ( 14 ) by means of a stamp ( 15 ) is imprinted.
Disc brake according to one of the preceding claims, characterized in that a plurality of protuberances distributed over the circumference ( 14 ) are provided.
Disc brake according to one of the preceding claims, characterized in that the plurality of protuberances ( 14 ) are arranged at the same angular distance from each other.
Disc brake according to one of the preceding claims, characterized in that each protuberance ( 14 ) engages in a recess adapted to its outer contour.
Disc brake according to one of the preceding claims, characterized in that the protuberance ( 14 ) has a round, non-circular or angular cross-sectional contour.
Disc brake according to one of the preceding claims, characterized in that the protuberance ( 14 ) is formed as a blind hole.