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EP-4735770-A1 - BEARING OF A CONVEYOR AND CONVEYOR WITH SUCH A BEARING

EP4735770A1EP 4735770 A1EP4735770 A1EP 4735770A1EP-4735770-A1

Abstract

Bearing (10) of a conveyor with at least an outer ring (12), at least an inner ring (14), rolling elements (16), which are designed to roll on the outer ring and the inner ring, and grease for lubricating movements of the rolling elements relative to the outer ring and the inner ring, wherein the grease contains Molybdenum disulfide.

Inventors

  • UZUN, Recep
  • Thim, Bo Niclas

Assignees

  • Aktiebolaget SKF

Dates

Publication Date
20260506
Application Date
20230727

Claims (10)

  1. 1 . Bearing (10) of a conveyor with at least an outer ring (12), at least an inner ring (14), rolling elements (16), which are designed to roll on the outer ring and the inner ring, and grease for lubricating movements of the rolling elements relative to the outer ring and the inner ring, characterized in that the grease contains Molybdenum disulfide.
  2. 2. Bearing (10) of a conveyor according to claim 1 , characterized in that the sum of the masses of Molybdenum and Molybdenum ions in the Molybdenum disulfide contained in the grease deviates from 6900 g per gram of the grease at most by 2900 pg per gram of the grease.
  3. 3. Bearing (10) of a conveyor according to claim 1 or claim 2, characterized in that one row (18) of the rolling elements (16) of the bearing contains less than 1 .05 rolling elements per centimeter of the pitch circle perimeter of the row.
  4. 4. Bearing (10) of a conveyor according to at least one of the preceding claims, characterized in that the bearing is a spherical roller bearing, which lacks a guide ring.
  5. 5. Bearing (10) of a conveyor according to at least one of the preceding claims, characterized in that at least one cage (20) of the bearing is hardened.
  6. 6. Bearing (10) of a conveyor according to at least one of the preceding claims, characterized by a cage (20a), which comprises on an axially outer face side (22a) a first surface area (24a), which is located at a radially inner end (30a) of the face side and which has a smaller axial distance from a center of mass (26) of the cage than a second surface area (28a) of the face side.
  7. 7. Bearing (10) of a conveyor according to at least one of the preceding claims, characterized in that a maximum radial load of the bearing during operation is 6580 Newton and/or a maximum axial load of the bearing during operation is 566 Newton.
  8. 8. Bearing (10) of a conveyor according to at least one of the preceding claims, characterized in that the grease contains graphite.
  9. 9. Bearing (10) of a conveyor according to at least one of the preceding claims, characterized in that one row (18) of the rolling elements (16) of the bearing contains between 67% and 87% of the number of such rolling elements which the row can maximally contain.
  10. 10. Conveyor with a bearing (10) according to at least one of the preceding claims characterized in that the bearing supports a roll (32) of the conveyor rotatably, wherein the roll supports a belt (34) of the conveyor in a moveable way.

Description

BEARING OF A CONVEYOR AND CONVEYOR WITH SUCH A BEARING The invention concerns a bearing of a conveyor and a conveyor. It is known to use spherical roller bearings to support a belt of a conveyor in a movable way. Examples for such bearings are the bearings 22205 E and 22206 E (cf. the SKF general catalog of 2018, page 792). The bearings don't comprise any seals. In the arrangement in the conveyor the bearings are sealed with external seals. The problem of the invention is in particular to provide a bearing of a conveyor which has a high degree of efficiency. The problem is solved according to the invention by the features of claim 1 and by the features of claim 10, while advantageous embodiments and further embodiments of the invention can be taken from the subclaims. The invention proceeds from a bearing of a conveyor with at least an outer ring, at least an inner ring, rolling elements, which are designed to roll on the outer ring and the inner ring, and grease for lubricating movements of the rolling elements relative to the outer ring and the inner ring. It is proposed that the grease contains Molybdenum disulfide. Through this a bearing of a conveyor, which has a high degree of efficiency, can be provided. In particular, a long lifetime of the grease can be achieved. In particular, during start stop operations of the conveyor a lubricant film is secured but molybdenum disulfide, which prevents metal to metal contact and decreases the creation of harmful wear particles. In particular, with the help of the Molybdenum disulfide a lubrication which is unaffected by dilute acids and oxygen can be reached. With advantage the sum of the masses of Molybdenum and Molybdenum ions in the Molybdenum disulfide contained in the grease deviates from 6900 pg per gram of the grease at most by 2900 pg per gram of the grease, preferably at most by 1200 pg per gram of the grease and most preferably at most by 400 pg per gram of the grease. Thereby an efficient lubrication and a long lifetime of the grease and the bearing can be achieved, in particular despite of frequent start stop operations of the conveyor. In particular, the grease can contain between 0.6 mass percent and 2.5 mass percent Molybdenum disulfide. Moreover, it is suggested that one row of the rolling elements of the bearing contains less than 1 .05 rolling elements per centimeter of the pitch circle perimeter of the row and more preferably less than 0.879 rolling elements per centimeter of the pitch circle perimeter of the row. Through this energy can be saved during the operation of the conveyor without diminishing the lifetime of the bearing in the conveyor. Moreover, costs can be saved. Advantageously the bearing is a spherical roller bearing, which lacks a guide ring. Through this unnecessary friction can be avoided, which means that energy can be saved during operation. Furthermore, it is proposed that at least one cage of the bearing is hardened. Thereby a long lifetime of the bearing can be achieved through avoiding premature failure of the cage, in particular through hammering forces exerted by the rolling elements coming from frequent start stop operations of the conveyor. In particular, the cage can be nitrile hardened. In particular, two cages of the bearing can be hardened, in particular nitrile hardened. In particular, the bearing can be a spherical roller bearing. Moreover, it is suggested that the bearing comprises a cage, which comprises on an axially outer face side a first surface area, which is located at a radially inner end of the face side and which has a smaller axial distance from a center of mass of the cage than a second surface area of the face side. Through this a contact between the cage and a sealing of the bearing during operation can be avoided, which implies that energy can be saved. In particular, the first surface area can be ring shaped. With advantage a maximum radial load of the bearing during operation is 6580 Newton and/or a maximum axial load of the bearing during operation is 566 Newton. Through this a low mass of the bearing can be reached. Advantageously, the grease contains graphite. Thereby improved lubrication can be achieved in case an oil film breaks down. In particular, the grease can contain between 0.6 mass percent and 2.5 mass percent graphite. In particular, a first seal is fixed to the outer ring or the inner ring in order to seal a space between the inner ring and the outer ring. In particular, a second seal is fixed to the outer ring or the inner ring in order to seal a space between the inner ring and the outer ring. Furthermore, it is suggested that a base oil of the grease is mineral oil and/or a thickener of the grease is lithium and/or calcium. Through this a high oxidation stability and a long lifetime of the grease can be reached. Moreover, it is proposed that one row of the rolling elements of the bearing contains between 67% and 87%, preferably between 72% and 82%, of the number of such