PROTECTION SHIELDING FOR ROLLING BEARINGS

Abstract: In shields made of plate, the end edge is overturned against the inner ring with which they form a labyrinth seal. The inner surface (16) of the ring (11) of the bearing with which the shields (14) form a labyrinth seal is provided with a step (15) situated near the edge (18) of the shield itself. The space (20) formed between the step (15) and the edge (18) of the shield retains the grease of the bearing which tends to come out; the pocket between the recess (19) and the edge (18) of the shield retains the grease which comes out and the foreign bodies which penetrate beyond the seal.

Description: This invention relates to a protection screening for rolling bearings. The term screened indicates a rolling bearing provided on its faces with thin screens made of plate, plastics or of a combination of such materials, said screens are forced into the grooves formed in the fixed race of the bearing and form with the mobile race a labyrinth seal; the purpose of the screens is to prevent the entry of foreign matters into the bearing and to retain in its interior the soap grase introduced during the construction. The object of the invention is to provide a particularly efficient screening for the purposes for which it is intended, as indicated hereinabove, in the case in which the screen is made of plate and with the end forming with the mobile race a labyrint seal turned toward the interior and faced by said mobile race. For attaining these objects the invention proposes to provide a protection screening for rolling bearings, characterized in that the inner surface of the race of the bearing with which the screens form a labyrinth seal is chamfered along the portions in which said labyrint seals are provided, thus forming respective steps with the remaining inner surface of the race. The subject-matter of the invention will now be described with reference to the annexed drawing which is a sectional view of a rolling bearing provided with a screening according to the invention. A rolling bearing of a known type has an outer race 10, an inner race 11, balls 12, a cage 13 and two plate screens 14. According to the invention, withinn the inner race 11 there are formed steps between the central portion 16 of its inner surface and the end portions 17 which are faced by the bent edges 18 of the screens 14. The step 15 constitutes a barrier against the entry of the foreign matters of the bearing should they succeed in entering into the spece between edges 18 of the screen and the surface 17 of the inner race, but above all it forms a space 20 with the end of the edge 18 of the screen, in which the grease of the bearing tends to depose rather than slipping towards and beyond the seal 17-18 which would happen in the case of a smooth surface 16-17, as happens at the present time. Still according to the invention, formed in the surface porions 17 are recesses 19 whose purpose is to form a container and retainer pocket for both the foreign matters which could penetrate into the bearing beyond the labyrinth seal and the grease which is contained in the bearing and which could escape outwards by surpassing the labyrinth seal. Hence, if the grease passes beyond the stagnation space 20 it is stopped by the pocket 19, whilst the pocket 19 alone is sufficient to retain, besides the eventual grease, also the dust which tends to penetrate into the bearing through the seal 17-18. Thus the combination of the step 15 and the pocket 19 fully attains the objects of the invention.

Claims: 1. A protection screening for rolling bearings, characterized in that the inner surface of the race of the bearing with which the screens form a labyrinth seal is chamfered a long the portion in which said labyrinth seals are provided, thus forming respective steps with the remaining inner surface of the race. 2. A screening as claimed in Claim 1, characterized in that in said inner surface of the race there are formed recesses disposed along said chamfered portions of the said inner surface. 3. A screening as claimed in Claim 1, characterized in that the steps are provided near the screens, thus forming with them a small space. 4. A screening as claimed in the preceding Claims, as described and illustrated hereinabove with reference to the annexed drawings.

Inventors: BERMOND, GABRIELE
Applicants: RIV-SKF OFFICINE DI VILLAR PEROSA S.P.A
Application year: 1987
Main classification: F16C33
IPC codes: F16C33