DE3617846C2 - - Google Patents

Description

The invention relates to a method for manufacturing Development of a brake shoe for disc brakes, in particular for Partial disc brakes, consisting of a carrier plate, a Intermediate layer and a friction layer of friction material be stands, wherein the intermediate layer of adhesive, for. B. one thermosetting plastic and an insert, preferably made of glass fibers, is formed, and wherein the intermediate layer in the form of a web or a piece of plate od. Like. Produced and with the carrier plate and the powder shaped friction material in a mold by pressing and Curing is combined into a unit and following up above-described brake shoe for disc brakes, in particular for partial lining disc brakes, consisting of a  Carrier plate, an intermediate layer and a friction layer consists, wherein the intermediate layer of a thermosetting Plastic and a reinforcement, preferably of glass fibers, is formed.

It is known for disc brake pads between the Trä plate and the friction layer to arrange an intermediate layer. The intermediate layer may be as desired Features, such as thermal insulation, noise reduction, Korro sion protection, bond strength u. Like. Different compo nenten to the basic mass of a thermosetting plastic and still has the task of connecting the To improve friction material with the carrier plate and thus to increase the shearing resistance of the covering.

It is also known in the intermediate layer of heat hardenable plastic, z. As phenolic resin, epoxy resin u. Like., A gain by short pieces of glass fiber vorzu see.

In DE-PS 29 23 051 is a thermosetting adhesive for bonding brake linings or brake pads wrote, in the flat carrier, such. B. paper, nonwovens made of cellulose, synthetic fibers or glass fibers, soaked in the aqueous dispersion of the adhesive, dried and possibly in addition to the introduction the desired amount of adhesive coated. there These flat carriers can be used in application-oriented formats get cut.  

In general, the production of the brake shoe takes place in such a way that the intermediate layer in powder form in a mold is introduced and together with the powdery friction material and the carrier plate, the coated with a heat-activatable adhesive, is pressed to a brake shoe.

This results in good strength values, in Transition area between friction layer and intermediate shift is the dividing line between the last two Layers are not defined exactly as a completely equal moderate pouring of the interlayer powder in the Press mold not possible under production conditions is. So it can with increasing pad wear by the partial grinding of the intermediate layer before Er extend the wear limit of the friction lining to a unwanted change in the coefficient of friction come.

In addition, the technical effort during pressing of a powdery interlayer material Lich, since the interlayer material has its own Weighing and dosing device on every press dig is.  

To avoid these disadvantages one is certain Use cases have been transitioned to the intermediate layer material by rolling or the like. to an intermediate to process layer plate. You lay with glue be layered lining carrier plate, intermediate layer plate and powdery friction material into the mold and squeezes the whole into a unity. this leads to to largely exactly definable separation areas zwi friction material and intermediate layer and simplified also the production process compared to the pressing a powdery intermediate layer. It appears however, that the strength values are so made The brake shoes do not reliably reach the desired height because of the manufacturing process of the Intermediate plate by rolling or the like. a seal the surface of the intermediate plate takes place, which is the Sticking between friction material and intermediate plate nega tively influenced.

The vote of the intermediate layer for adaptation to the respective requirements, such as thermal insulation, Ge Noise absorption, bond strength, corrosion protection and the like., Narrow limits are in this method sets, as the required minimum strength values only with a few mixture variants of the Zwi layer material can be achieved.

The object of the invention is to provide a method for Her position of a brake shoe and a brake shoe create, at or in the case of simplified Pro a high shearing resistance of the coverings under Retention of the other desired positive  Properties of the intermediate layer, such as noise damping, Thermal insulation, corrosion protection u. Like., With each other the brake shoe are united. To solve this Task serve the present invention, the features of the claims 1, 2 or 3. The interlayer material (Compound), a heat-activated adhesive and possibly Additives, is used to set the desired vis viscosity and the pasty mixture applied to a fiberglass mesh and evenly, d. H. in uniform thickness, on the fiberglass mesh passed, z. B. distributed by doctoring, whereupon the Interlayer material is dried.

From the dried intermediate layer obtained in this way material, preferably as a web, can be cut by cutting / Punching an intermediate layer matching the carrier plate piece of the track and then with the carrier plate and a powdery friction layer material by pressing and heating to the fer term brake shoe when curing the plastic material get connected.

The heat-activatable adhesive that is in the interlayer material is incorporated on the carrier plates side of the intermediate plate for a good connection of the Support plate with the intermediate plate. A good connection of the friction material with the intermediate plate results in that during production of the intermediate plate while a flat surface is present, which defines a Dividing line between friction material and intermediate layer material ensures the surface of the intermediate plate on this dividing line but a sufficient Roughness has that to a particularly good gearing  with the friction material leads. This increases the shear strength significantly, unlike one else intermediate rolling and / or pressing at the Intermediate layer for producing an intermediate plate, which makes the surface too smooth. In addition, the increased Fiberglass net skeletal supporting structure the strength of the intermediate plate and thus contributes to the necessary shearing resistance of the covering against the Support plate not insignificantly reliable at.

As has been shown, can be in the intermediate layer material incorporated, heat-activated adhesive also by solvents for light bonds akti four. This circumstance is made useful by it take advantage of that by adding a drop of solution means a slight adhesion between the carrier plate and Inventively produced intermediate layer plate manufactures.

A prefabricated support plate in this way leads to a considerable relief in the pro production, as for the completion of the brake shoe only two parts, namely the prefabricated carrier plate and the powdery friction layer material by pressing and heating to connect to a brake shoe.

It is advantageous to use glass fiber for the production fabric with the following data:

Glass fiber fabric with leno binding Thread distribution of the warp threads about 4-8 per cm Thread distribution of the weft threads about 2-3 per cm denier about 0.6-1.2 mm

The intermediate plate produced according to the invention can for different purposes are optimized.

Examples 1 to 3 give the composition of Compounds as starting material for the intermediate layer in weight%.

Example 1 Optimization of the thermal insulation
Example 2 Optimization of bond strength
Example 3 Optimization of noise damping

The invention is based on the Darge in the drawing explained examples.

Fig. 1 illustrates a pictorial representation of the process flow.

Fig. 2 to 5 show an embodiment of the individual parts and the brake shoe in the diagram.

In Fig. 6 is a cross section through a fiction, prepared brake shoe is shown.

When making the intermediate plate, it is convenient so before that first a large piece of track in a through running process is continuously produced.

The starting point for the production process is formed by a compound consisting, for example, of one of the three abovementioned mixtures. This compound 1 is intimately mixed in a solvent kneader 4 with the addition of heat-activatable adhesive 2 and possibly as needed by viscosity-adjusting additives 3 , until a pasty flowable mass is formed.

This paste can then be removed by means of a metering pump 6 from a reservoir 5 . By the metering pump, this mass is supplied in the correct amount of the doctor device 9 , which is formed in the example given manufacturing process as an air knife off; wherein the methods of roll or blanket sheeting can also be applied. In the doctor blade operation, the paste-like intermediate layer material is applied in a uniform thickness on a taken from a roll / coil glass fiber network 7 . So that during the production process of this intermediate layer material does not adhere to the transport device or sticks, siliconized paper 8 is still supplied under the fiber optic network.

Depending on the degree of drying that can be achieved for the various recipes in the drying section 10 , one-sided or double-sided siliconized paper is used. Double-sided siliconized paper is used when, after the drying distance of the drying process achievable in the continuous process drying degree of the intermediate layer is so low that the risk of sticking together the individual intermediate layer layers during winding into a coil. In this case, which is also based on the production process of FIG. 1, then the double-sided sili konisierte paper together with the band-shaped inter mediate layer be wound into coils.

With sufficient degree of drying only one-sided siliconized paper is used, which is then removed before winding on to coils 12 . In both methods, a Trenneinrich device 11 is still provided after the drying section (eg., Circular knife shears), in which the strip material is split into the widths required for further processing, before it is wound into coils 12 different width.

After transport and possibly stock storage inter mediate plates of the intermediate layer material 13 with the dimensions of the intermediate plate Richti gene width, in a cutting or punching device 15 are cut / punched out.

When using double-sided siliconized paper which has been wound on the coil, this is removed at 14 before the punching / cutting process of the bandförmi gene interlayer material. After the punching / cutting operation, in which the contour of the intermediate plate 24 ( FIG. 3) is determined according to the outer contour of the friction lining and the anchorage holes of the lining carrier plate, a small amount of solvent 16 is now added to the side of the intermediate plate 24 Carrier plate 22 ( Fig. 2) faces. This solvent causes easy activation of the incorporated in the intermediate layer material Kle bers. After feeding 17 of the lining carrier plate 22 , the intermediate plate 24 is now placed on the support plate contour-right and pressed under slight pressure 18 . The activated by the solvent Kle ber causes a slight bonding between Trä carrier plate and intermediate plate.

The now prefabricated with the intermediate plate carrier plate ( Fig. 4) forms an independent handleable bare composite unit, which can be stored in advance before further processing in stock.

The prefabricated carrier plate ( FIG. 4) is now placed in the press 20 and pressed with the powdery friction material 19 to the brake shoe. Fig. 5 shows this brake shoe 21 , wherein it can be clearly seen that the outer contour of the intermediate plate 24 corresponds exactly to the outer contour of the friction lining 23 .

The brake shoe ( FIG. 5), which has a carrier plate 22 of predetermined configuration and a friction lining 23 , contains an intermediate layer plate piece 24 formed from a mixture of interlayer material and a heat-activatable adhesive in which a glass fiber network 7 is embedded. The intermediate layer plate piece is of uniform thickness and has a planar and roughened surface 26 and 27 .

By ensuring the required shear strength For the brake shoe, it is possible to have the property th of the intermediate layer in a wide frame Modification of the formulation of the interlayer compound for different requirements, such as thermal insulation, Ge noise reduction, bond strength and corrosion protection, to optimize while maintaining a simplified hand to ensure production in production.

Claims (10)

1. A method for producing a brake shoe for disc brakes, in particular brake for part discs, which consists of a support plate, an intermediate layer and a friction layer of friction material, wherein the intermediate layer of adhesive medium, z. B. a thermosetting plastic and an insert, preferably made of glass fibers, and wherein the intermediate layer in the form of a web or a plate piece od. Like. Herge and with the support plate and the powderför shaped friction material in a mold by pressing and curing a unit is connected, characterized in that for the intermediate layer (compound) for their optimization in terms of thermal insulation in weight percent Phenol novolak 15 mineral fiber 30 Fe or Ne metals 40 calcium hydroxide 5 polyaramide 3 vermiculite 7 is used. 2. A method for producing a brake shoe for disc brakes, in particular brake for part discs, which consists of a support plate, an intermediate layer and a friction layer of friction material, wherein the intermediate layer of adhesive medium, z. B. a thermosetting plastic and an insert, preferably made of glass fibers, is gebil det, and wherein the intermediate layer in the form of a web or a plate piece od. Like. Herge and with the carrier plate and the powderför shaped friction material in a mold by pressing and curing is combined into a unit, characterized in that for the intermediate layer (compound) to optimize it in terms of the bond strength in weight percent Phenol novolak 20 mineral fiber 20 Fe or non-ferrous metals 35 calcium hydroxide 5 barite 11 polyaramide 5 vermiculite 4 is used. 3. A method for producing a brake shoe for disc brakes, in particular brake for part discs, which consists of a support plate, an intermediate layer and a friction layer of friction material, wherein the intermediate layer of adhesive, for. B. a thermosetting plastic and an insert, preferably made of glass fibers, and wherein the intermediate layer od in the form of a web or a plate piece. Like. Produced and with the carrier plate and the powder-shaped friction material in a mold by pressing and curing to a Unit is connected, characterized in that for the intermediate layer (compound) for their optimization in terms of noise reduction in weight percent Phenol-cresol novolak 15 mineral fiber 20 Fe or non-ferrous metals 45 calcium hydroxide 5 barite 5 polyaramide 2 rubber 3 vermiculite 5 is used. 4. The method according to any one of claims 1 to 3, characterized in that the components of the com pound mixture ( 1 ) with the addition of heat treatable vierbaren adhesive ( 2 ) and depending on the need vis viscous additives ( 3 ) are intimately mixed ver until a pasty flowable mass is formed. 5. The method according to any one of claims 1 to 4, since characterized in that the compound mass in uniform layer thickness on a fiberglass mesh and then by drying to a independently manageable product in the form of a Track, plate od. Like. Is converted.   6. The method according to claim 5, since characterized in that the hand independently habitable compound product punched into individual pieces or cut, and that of the web od. Like. obtained single piece with the support plate and the powdery friction layer material Pressing and heating to the finished brake shoe is connected. 7. The method according to any one of claims 1 to 6, since characterized in that an adhesive is used is, in a known manner also by a solvent is activatable, that the Interlayer plate piece by means of the solution by means of the adhesive with the support plate for Liability is brought, and that the so preconfect tionierte carrier plate with the powdery Frictional layer material by pressing and heating to the finished brake shoe is connected. 8. Brake shoe for disc brakes, produced by a method according to one of claims 1 to 7, in particular for Teilbelagscheibenbremsen, which consists of a support plate, an intermediate layer and a friction layer, wherein the intermediate layer of a thermosetting plastic and a reinforcing Ver, preferably made of glass fibers, is formed, characterized in that the intermediate layer plate piece ( 24 ) consists of a mixture of intermediate layer material and heat-activatable adhesive, and an embedded glass fiber network ( 7 ), which is of uniform thickness and has roughened surfaces ( 26, 27 ). 9. Brake shoe according to claim 8, characterized in that the intermediate layer plate piece ( 24 ) and the support plate ( 22 ) form an independently manageable Ver bundeinheit. 10. Brake shoe according to claim 8 or 9, characterized marked records that the fiber optic network as a glass fiber fabric Warp threads of about four to eight threads per cm, Weft threads of about two to three threads per cm on points and the thread thickness in the range of approx. 0.6 to 1.2 mm.