DE2754185A1 - BRAKE PAD FOR DISC BRAKES - Google Patents

Description

- 1480 -

Brake lining for brake shoes of disc brakes

The invention relates to a brake lining for brake shoes ν η £ diskbreases in accordance with the preamble of the main claim specified genus.

Mostly linked to the vehicle by hanging straps and Brake shoes pressed against the brake disc by clamping devices with brake calipers can cause slight pivoting and tilting movements perform in two degrees of freedom. It can therefore not be prevented that it is unavoidable during operation Occurring uneven covering wear the resiliently held in accordance with the manner described above Brake shoes are subject to oblique wear.

One of the causes that cause the uneven wear of a brake lining is that between the curved ones Inside and outside sections of the brake lining occurring at different sliding speeds. The bigger the difference between the sliding speed on the inner section and the outer section is what is special This is the case with brake disks with a small outer diameter, the greater the inclined wear that occurs.

909823/0409

One of the most common destructive effects on the brake lining count in addition to the different material qualities ^ 'e.g. due to poor mixing of the island components or uneven Vulcanization of materials, especially those Texture loads.

Efforts to equalize the oblique wear by countermeasures, e.g. by shifting the line of application of force, - Position of the pivot pin receiving the end of the brake calliper - on the pad holder, only led to partial success. Tests in this direction have shown that the dependence of the specific wear on surface pressure and speed is not linear.

The relationships can be clarified by et \ ra in the following formula will:

V G χ p <* χ

Wear friction lining

Material constant

The exponents oC and P are generally parameters that depend on the lining quality, ρ means the surface pressure and ν the sliding speed of the brake lining. When the pre-wear occurs, the level of temperature plays an important role.

-5-909823 / 0409

The plastic brake lining material contains binders. If the surface reaches, especially at a higher sliding speed exposed outer sections, a temperature of 350 ° C and more, what with occurring disc temperatures of over 450 ° C is possible, a Evaporation and evaporation of constituents of the binder and the mechanical strength of the granular material vulcanized by the binder is decreased. Next to the normal occurrence of fine and dusty abrasion leads to crumbling of the covering material, i.e. a strong one Reduction of the service life of the brake pads, their renewal with costs for material and working hours, the rest temporarily inoperable vehicles is connected.

The aim of the invention is · the occurrence of oblique wear to prevent and prolong the service life of the brake linings from the brake shoes for vehicle disc brake devices to reach.

The invention is therefore based on the object of resistance of the brake lining material of a brake shoe over the output surface due to sliding speed and heating adapt to differently distributed occurring wear processes, with the handling of such improved brake pads no changes to the existing facilities the Brense should result.

-6-909823 / 0409

The object is according to the invention in accordance with the main claim specified features solved.

Further advantageous developments of the invention are evident from the subclaims:

The invention is explained in more detail with reference to the exemplary embodiments shown in the drawing.

It shows:

ig.1 a longitudinal section through a brake lining and

2 shows a cross section through the brake lining along the line II - II.

Fi3. 1 shows a longitudinal section through the brake lining 1 thereof on its long side extending roundings are adapted to the friction ring of a brake disc not shown. The one shown Brake lining 1 consists of two one behind the other in the circumferential direction, symmetrical to one another Parts 2 and 3 · This composition of the total area of the brake lining 1 from 2 in the parting plane 4- seamlessly together bordering parts 2 and 2 is irrelevant for the operation of the invention.

-7-909823 / 0409

Ec is also insignificant in which form the brake pad is attached to the brake pad carrier. In the present case an embodiment with a dovetail is chosen.

On both sides of a parting plane 8 is the axis of rotation The approximately arcuate inner section 7 facing the brake disk or one facing the circumference of the brake disk approximately arcuate outer section 6. The brake lining material of the outer section 6 differs, as already can be seen by the hatching in FIG. 1, of which Brake lining material of the inner section 7 · The boundary between the two brake lining materials, which corresponds to dividing line 8 an arc of a circle whose center point lies on the axis of rotation of the brake disc. The relocation of this parting line 8 more in the direction of the circumference of the brake disk or more in the direction of the axis of rotation of the brake disk is directed according to the desired influence on the wear processes on the two sections 6 and 7 In each case it is necessary in order to prevent inclined wear on the brake lining, the material exposed to the higher sliding speed of the outer section 6 with greater plastic hardness. When making the from Brerasbclagmaterial with different plastic hardness composite ^ .xems lining 1 can be done in a number of ways.

909823/0409

275A185

The outer section 6 and the inner section 7 are considered to be separate Parts made of brake lining material with different plastic hardnesses and then made by suitable Means firmly connected to one another in their parting plane 8. Another porn of making the outside and inside different Brake lining 1 having plastic hardness can be achieved by different vulcanization processes (strengthening of the binding agent) can be achieved on the inner section 7 opposite the outer section 6.

In contrast to the first-mentioned process, the last-mentioned manufacturing process changes the coefficient of friction from an inner side of the brake pad to the radially outer side — of the brake pad continuously.

With simultaneous, joint production of the sections 6 and 7 cLes brake lining 1, the can continuously over the width of the brake lining changing plastic hardness the size of the changing according to known laws Sliding speed between the brake disc and brake pad can be adjusted.

Pur vehicles whose operation only takes place in one direction of travel, e.g. trams, and their brake disc therefore only runs in one direction, the formation of the brake lining material be adapted to the known occurring servo effect.

-9-909823 / 0409

Here, the section 9 of the brake pad facing the inlet-side end can have a greater plastic hardness have than the portion 10 of the brake lining facing the outlet-side end of the brake shoe.

Due to the two-part design of the entire brake pad surface, special production is required for the left or right hand side. right of the brake disc attachable lining halves 9 with large Plastic hardness or lining halves 10 with low plastic hardness and a corresponding double storage, provided that the brake lining is held in the lining carrier by means of a dovetail design he follows.

For the use of modern wear indicators, the essential parts of which are housed in the lining carrier, the brake lining according to the invention "does not constitute an obstacle.

Experience has shown that the values of the plastic hardness dec are available

3 brake lining material used between approx. 500 K / mm

(Newton / square millimeter) and approx. 1,250 N / mm, whereby the brake lining in the version with continuously changing plastic hardness is created by influencing the vulcanization processes.

909823/0409

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Claims (1)

JSinchcn, November 23, 1977 TPii-nt / kr 9754185 - 1480 - KNOHH BEEMSE
GmbH Moosacher Strasse 80
8000 Munich 40 Claims Brake lining for brake shoes of disc brakes, in particular disc brake devices for vehicles, the brake shoes which can be pressed against a brake disc by means of a clamping device about at least one to the plane of the brake disc
parallel axis are pivotally mounted, characterized in that the brake lining (1) has an increasing hardness of carbon from the outlet to the inlet end in relation to the brake disc radially from the inside to the outside and / or in relation to the rubbing direction, counter to the rubbing direction from the outlet to the inlet end. 2. Brake pad according to claim 1, wherein the brake shoes are pivotable about an axis parallel to the friction direction, characterized in that the brake pad (1) is one from radially inward
has plastic hardness increasing radially outward. -2- 909823/0409 ORK ₃₁ NAL ₁ NSPECTb ₃ Brake lining according to Claim 2, characterized in that the plastic hardness at the radially inner edge approx. 500 wearing. N / ram and on the radially outer edge approx. 1250 N / mm 4. Brake pad according to claim 1, wherein the brake shoes are pivotable about an axis perpendicularly crossing the friction direction, characterized in that the brake lining (1) rises against the direction of friction from the outlet to the inlet end Plastic hardness. 5. Brake pad according to claim 2, 5 or 4, characterized in that that the plastic hardness from radially inside to outside and / themselves or continuously changing from the outlet to the inlet end * increases. 6. Brake pad according to claim 2, 3 or 4, characterized in that that the plastic hardness increases from radially inside to radially outside and / or from the outlet end on the inlet side or increases by leaps and bounds several times. 7. Brake pad according to claim 6, characterized in that it consists of Bremcbelagab3chnitte (7, 6) or (Qi 10) different Plastic hardness is composed, with the parting surfaces (3 or 4) vertically between the Brcrasbelagabschnitte to the plane of the brake disc and on a circular arc around or radially to the axis of rotation of the brake disc. 909823 / 0A09 " ³ "