FI72087B - KLAEMSPAOR PAO BROMSSKIVOR FOER SKIVBROMSAR - Google Patents

Description

FBI m ^ UULUTUSJULKA.SU 7208 7 • «SF® ™ (11> UTLÄGGNINGSSKRIFT ^ UO / C Patent granted * 45) P '' * cnt 13 04 1087 ^ ^ (51) Kv.lk.7lnt.Cl.4 B 61 H 5/00 FINLAND — FINLAND (21) P »examination application— Patentansökning 782872 (22) Application date— Ansöknlngsdag 20.09.78 (FI) (23) Starting date - Giltighetsdag 20.09 * 78 (41) Becomes Public - Blivit offentlig 22.03.79

National Board of Patents and Registration Date of presentation and hearing— 31.12 86

Patent and registration authorities '' Ansökan utlagd och utl.skriften publicerad (86) Kv. application - Int. ansökan (32) (33) (31) Privilege claimed — Begärd priority 21.09 * 77

The Federal Republic of Germany, Förbundsrepubliken Tyskland (DE) P 27 ** 2468.6 (71) Bergische Stahl-lndustrie, Papenberger Strasse 38, Remscheid,

Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (72) Hans Zeuner, Remscheid, Willi Klein, Remscheid,

German Federal Republic of Germany (DE) (7 * 0 Oy Kolster Ab (5 * 0 Disc brake brake disc clamping groove in the discs - Clamp for brakes for vehicles)

The invention relates to a clamping groove in the brake discs of disc brakes, in particular for rail vehicles, which is fitted to a brake ring and / or hub and has approximately parallel, radial and facing clamping surfaces between which a guide strip is clamped to another part of the brake ring and hub.

German patent publication 1 222 962 discloses a principle in which a guide strip is arranged on a brake ring or hub, which is pressed against one part in a tightening groove and by means of which the two parts are fixedly connected to one another. The connection allows a non-slip transfer of the braking forces, but on the other hand it certainly allows the brake ring to expand under the influence of the heat generated during braking in a radial manner corresponding to the heating.

Application publication 2 426 952 discloses a further developed solution of the above-mentioned basic idea, in which both parts 2 72087, namely the hub and the brake ring, each have a corresponding tightening groove into which a separate tightening strip is pressed to connect the two parts. All clamping grooves are basically similar and consist of two facing radial clamping surfaces and the groove base is made mostly approximately tangentially oriented, approximately in the shape shown in both of these publications.

These tightening joints are particularly stressed when small vehicles run on poor track sections and / or high speeds. In this case, the tightening force on the one hand and the strength of the tension joint arms on the other hand must be such that the guide strip or tension strip does not rise in the direction of rotation when viewed from the rear or the tension groove arm in contact with the guide strip or tension strip. For example, in the case of said stresses caused by loads due to poor rail conditions, comparable forces are involved, which result, for example, from vertical accelerations which affect the tightening joints. If the resistance of the tightening joints to these forces is lower, then this results in the loss of the tightening force and the brake rings become detached from the hub in the direction of rotation. Thus, although the safety of the vehicle to be braked is not completely compromised, since the brake disc is still operational, this condition must be avoided so that no further damage is caused when these brakes are still used.

The object of the present invention is therefore to avoid the disadvantages of the known tensioning grooves and to provide a tensioning groove which can withstand higher loads caused, for example, by the vehicle running on poor rail sections.

The problem is solved in that the groove base consists of a semi-cylindrical surface with an axis parallel to the axis of rotation of the brake disc and a diameter equal to the distance of the clamping surfaces, a uniform cylindrical surface uniformly hardened to at least 52 HRc and a thickness of at least 1 mm , but not more than 5 mm.

Preferably, the hardened layer on the cylindrical surface is uniform.

Il 3 72087

Conveniently have a semi-cylindrical shaft for steering! outside the clamping strips in the free space of the clamping groove.

The advantage of the solution of the clamping groove according to the invention is, above all, that the clamping groove can withstand higher loads, because the hardened cylindrical surface has specific compressive stresses against which the operating stresses act.

The drawing shows an exemplary embodiment of the invention and Fig. 1 is a perspective view of a tightening groove arranged on the hub and Fig. 2 shows a tightening groove and a guide strip.

According to the drawing, the clamping groove 11 consists of two opposing, approximately radial and parallel clamping collars 12 fitted to the arms 13. The groove base of the clamping groove 11 is formed by a semicircular surface 14. The diameter D of the cylinder then corresponds to the distance . In this example, the clamping groove 11 is arranged on the hub 17, in contrast to which a guide strip 19 is fixedly arranged in the brake ring 18, which is pressed between the clamping surfaces 12 of the groove 11, whereby the free space 21 of the groove remains free. The shaft 15 of the half-cylinder is then outside the guide strip 19 in the free space 21 of the clamping groove 11.

The clamping surfaces 12 and the half-cylinder surface 14 are then flame-hardened to form a hard layer about 20 mm thick, which is about 52 HRc, after which the layer 20 has been subjected to an emission treatment at a temperature of about 200 ° C. With the clamping surfaces 12, this layer 20 prevents rapid wear of the groove and the pressed guide strip or clamping strip sliding against each other. In the area of the semi-cylindrical surface, a guide strip 19 is formed when pressed into the groove 11 with uniform stresses, which results in a large tightening force against the surfaces 12.

The volume of hardened material consisting of the semi-cylindrical surface 14 and the thickness of the layer 20 and having pressure-specific stresses receives the operating stress of the brakes, providing a higher tensile strength against these stresses than the initially known structure according to German Patent 1,222,962.

Claims (3)

72087 The extension of the hardened layer in the region of the contact surfaces 12 of the clamping groove 11, where these are in contact with the guide or clamping strips 19, reduces wear when relative movements occur at this point during braking heating. Therefore, the specific stresses of the hardened layer 20 are of no significance. The same is true when the clamping grooves are fitted not only to the hub but also to the brake ring, which clamping grooves correspond to each other and into which a separate clamping strip is pressed in to connect the two parts. Clamping groove (11) in disc brake discs, in particular for rail vehicles, fitted to a brake ring (18) and / or hub (17) and having approximately parallel, radial and facing clamping collars (12) between which the brake ring and hub a guide strip or a separate clamping strip (19) fastened to the second part, characterized in that the groove base consists of a semi-cylindrical surface (14) whose axis (15) is parallel to the axis of rotation (15) of the brake disc and has the same diameter (D) than the distance between the clamping surfaces (12) and (13), that the entire cylindrical surface (14) is uniformly hardened over its surface to a hardness of at least 52 HRc and that the thickness of the hardened layer (20) is at least 1 mm but not more than 5 mm. Clamping groove according to Claim 1, characterized in that the hardened layer (20) has a uniform thickness on the semi-cylindrical surface (14). Clamping groove according to Claim 1 or 2, characterized in that the shaft (15) of the semi-cylindrical surface (14) is located outside the guide or clamping strips (19) in the free space (21) of the clamping groove (11). Il