RU36467U1 - FRICTION BEARING - Google Patents

Description

2003136520

II

2- 0 O 73/1 jMPK7R16S19 | 00

BEARING CACHEPS

The utility model relates to the field of mechanical engineering, in particular, to designs of rolling bearings operating at high rotational speeds under conditions of elevated ambient temperatures and can be used in the bearing industry in the manufacture of bearings.

Known rolling bearings containing the outer and inner rings made of bearing steel, between which are placed with a gap in the slots of the separator of the rolling body. (Directory-catalog "Rolling bearings. Engineering, 1997, p. 318)

The disadvantage of such bearings is that at high speeds and elevated ambient temperatures, the liquid and plastic mass lose their working capacity and the bearing fails.

The closest in technical essence to the inventive rolling bearings are rolling bearings containing an outer and inner ring and a cage made of two semi-separators with recesses forming an inner cavity with a solid lubricant, for example, a mixture of molybdenum disulfide and fluoroplastic, with the possibility of contact solid lubricant with rolling elements, and also with the outer ring flanges guiding the separator through the radial channels made in the separator (Certificate for Utility Model JNfe8 067, IPC F 16 C 19/00, 1998.) In this bearing, solid lubricant

retains lubricating properties and reduces the coefficient of friction at significant operating temperatures and high speeds.

A disadvantage of the above design of rolling bearings is the occurrence of metal contact and adhesion between the rolling bodies and raceways of rings made of bearing steel of the same brand due to the uneven distribution of particles of solid lubricant on the contact surface. This leads to damage to the contacting surfaces, especially the balls, increased vibration and reduced bearing life. In addition, heating of the bearing parts due to poor heat dissipation by solid lubricant leads to a decrease in the radial clearance in the bearing and its jamming. The bearing of this design is taken as a prototype.

The utility model is based on the task of creating a rolling bearing with an increased service life.

This problem is solved by the fact that in the rolling bearing containing the outer and inner rings of hardened steel, a cage made of prefabricated and consisting of two half separators with recesses forming an inner cavity filled with solid lubricant, for example, a mixture of molybdenum disulfide and fluoroplastic, with the possibility of contact solid lubricant with rolling elements installed with a gap in the seats of the separator and with the separator sides of the outer ring through radial channels made in the separator, according to the claimed In the second model, the rolling bodies mentioned are made of ceramic material based on silicon nitride Sis Ni4.

The essence of the utility model is illustrated by the drawing, where in FIG. 1 and figure 2 shows a radial ball bearing in section.

(, f

The inventive rolling bearing consists of an outer 1 and an inner 2 rings, between which the rolling elements 3 are mounted, installed with a gap in the nests of the separator, made of prefabricated and consisting of two half separators 4 and 5 with recesses forming an internal cavity 6, radial channels 7 filled with solid lubricated and riveted 8. The mentioned rolling elements 3 are made of ceramic material based on silicon nitride 81з Ni4, and the outer and inner 2 bearing rings are made of heat-resistant bearing steel, for example, 8X4V9F2-Sh.

The rolling bearing operates as follows.

Rolling bodies 3, when the bearing rotates, come into contact with solid lubricant located in the inner cavity 6 of the half separators 4 and 5 and carry it into the contact zone with the surface of the raceway of rings 1 and 2. Due to the uneven distribution of lubricant and its absence in some parts of the contact area, non-segregated contact of the microroughness of balls and rings and, especially when slipping, the occurrence of a molecular bond between the contact surfaces - adhesion occur. Due to the heterogeneity of the materials of the contacting surfaces of ceramic balls and steel rings, the manifestation of the negative effect of adhesion is significantly lower than when contacting homogeneous steel materials, in addition, the hardness and wear resistance of the ceramic material is significantly higher than steel, which increases the working life of the bearing. The low coefficient of thermal expansion of ceramic balls ensures the preservation of the radial clearance in the bearing at significantly higher operating temperatures than with metal rolling bodies, which reduces the likelihood of seizing bearings when heated in

the process of work. Solid lubricant placed in the radial channels 7, falls into the contact zone and reduces friction of the outer surface of the separator and the guide rails of the ring.

Bearing rolling bodies made of ceramic material based on silicon nitride have a higher hardness and wear resistance than steel, which ensures their greater durability. In addition, heterogeneous materials of rings (steel) and balls (ceramics) provide a reduction in the negative phenomenon of the occurrence of molecular bonds between contact surfaces during operation of the bearing under conditions of boundary lubrication. The low coefficient of thermal expansion of ceramic balls ensures the preservation of the radial clearance in the bearing, reducing the likelihood of seizing bearings during heating during operation of the bearing.

Claims (1)

A rolling bearing comprising an outer and an inner ring made of hardened steel, a cage made of prefabricated and consisting of two half-separators with recesses forming an internal cavity filled with solid lubricant, with the possibility of contact of solid lubricant with rolling bodies installed with a gap in the nests of the separator, characterized in that the said rolling bodies are made of ceramic material based on silicon nitride Si ₃ Ni ₄ .