SK278665B6 - High-revolution bearing with supplementary lubrication - Google Patents

Abstract

This patent describes a bearing with a high number of revolutions, mounted in the machine for completing speeding especially, used for spinning rotor shoulder, containing axle (1) with steel revolving trajectories and the cylindrical shell (2) with steel revolving trajectories, in which the rolling bodies (3) are placed and these bodies a guided with the metal cribworks (3) made of the technical ceramics.

Description

Technical field

The invention relates to a high-speed bearing, in particular a spinning machine, intended for mounting a spinning rotor, comprising a steel raceway shaft and a raceway with steel raceways in which rolling elements guided by metal cages are located.

BACKGROUND OF THE INVENTION

Currently used for mounting the spinning rotor open-end spinning machine, the frequency of the speed of the machine type in the range from 40,000 to 100,000 min ^-1, high-speed bearings. In a classic design, this special double-row ball bearing of higher accuracy consists of a cylindrical bushing and a raceway shaft in which the rolling elements are distributed evenly around the circumference by light cages.

A bearing is generally required to perform its function with sufficient reliability for a sufficient period of time. In all previous versions, especially on the area of the frequency speed of 90,000 rpm ¹ Load bearing rings, cage and grease relatively large mass of rolling elements of bearing steel.

It is also known from EP 258 845, published September 9,1988, in which all parts are made of ceramic.

However, the installation of a high-speed spinning rotor of an open-end spinning machine requires a specific bearing arrangement in which the use of ceramic on all of its components is virtually unrealistic for several reasons.

One of the basic criteria for assessing the bearing performance is the energy balance, simply expressed by its operating temperature, which should not exceed certain predetermined values intended for trouble-free and trouble-free operation of the equipment for which the bearing is intended.

During the operation of open-end spinning machine performs spinning rotor rotating movement with a very high number of revolutions and reaching 100,000 otmin ^'first Therefore, it is necessary to fit a spinning rotor bearing with a very favorable energy balance, ie its material properties allow maximum and rapid heat dissipation into the environment, so that the bearing and hence the spinning rotor are not inoperative, because the spinning rotor is one of the most important components of the spinning machine, on which the qualitative properties of the spinning process itself and the resulting product of the process depend. An all-ceramic bearing is unsuitable from this point of view, because the biggest problem in the operation of all-ceramic bearings is the very difficult and inefficient heat dissipation at the expense of their otherwise good mechanical properties.

From a constructional point of view, the design of the spinning rotor bearing as an all-ceramic bearing would pose other difficult problems. Ceramic bearing bushing would be demanding in shape, ceramic spinning rotor shaft would have very different static and dynamic compliance, which is undesirable due to the dynamic properties of the entire spinning rotor shoulder, for example due to increased resonant frequency range resulting in more resonance than the most dangerous technical phenomenon. for accurate and thus resonance sensitive high-speed devices or shoulders.

The possible use of ceramic inserts as guideways in the bearing housing and on the shaft of the spinning rotor is technically difficult to implement and could make it less reliable. Moreover, the design of the two bearing design variants of the spinning rotor 10 described above is very expensive and therefore uneconomical to operate.

It is an object of the present invention to provide a high-speed bearing design which optimally combines the advantages of the prior art solutions while significantly reducing their disadvantages.

SUMMARY OF THE INVENTION

This object is achieved by the technical solution of a high-speed bearing according to the invention, comprising a steel raceway shaft and a steel raceway cylinder housing in which rolling elements guided by metal cages are located, the subject of the invention being that the rolling elements are made of ceramics.

The advantages of using technical ceramics to form rolling elements are that, with a lower specific weight of the technical ceramics from which the rolling elements 30 are formed, compared to the bearing steel, the stresses of the bearing parts and the lubricant are significantly reduced, the energy balance of the bearing is improved its durability and reliability. The use of technical ceramics to create rolling elements makes it possible to respond to the requirements of 35 machine manufacturers by increasing their speed. When comparing ceramic roller bearings and bearing steel roller bearings, it can be stated that with the same parameters as energy balance, durability and reliability, a lo40 ceramic roller bearing will achieve a higher frequency compared to the bearing steel roller bearing speed.

BRIEF DESCRIPTION OF THE DRAWINGS

The high-speed bearing according to the invention is shown in the attached drawing, where a longitudinal section of the bearing is shown.

DETAILED DESCRIPTION OF THE INVENTION

The bearing consists of a shaft 1 and a cylindrical bushing 55 2 with raceways in which rolling elements 3, guided by cages 4 are located. The bushing 2 is provided with a seal 5 at both ends and a clamping ring 6 on the outer surface. technical ceramics, non-oxide ceramics as the bá60 _of silicon nitride Si ₃ N ₄ and SiC, or oxidic ceramic based on aluminum oxide Al ₂ O ₃ and the like. The specific weight of technical ceramics is at least 25% lower than the specific weight of bearing steel, but mostly by 50% or more.

Industrial usability

The invention can be used in the bearing industry, in particular for high-speed bearings.

Claims (1)

PATENT CLAIMS High-speed bearing, in particular a spinning machine for fitting a spinning rotor, comprising a shaft with 10 orbits and a cylindrical bushing with steel orbits, in which rolling elements guided by metal cages are located, characterized in that the rolling elements (3) made of technical ceramics. 15