RU2475653C1 - Sliding bearing with regular microrelief - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: sliding bearing with regular microrelief is additionally equipped with a removable steel bushing pressed onto a crank journal of the shaft, to external side of which a regular microrelief is applied, the width and pitch are equal to double value of maximum linear wear of sliding bearing insert. Bearing insert has smooth surface without any microrelief on its internal surface. Bearing is equipped with forced supply of lubricating material with metal cladding additives providing the formation of servovite, including copper film ~1…2 mcm thick between the bearing insert and external surface of steel bushing with regular microrelief.

EFFECT: increasing wear resistance of bearing and its service life in connection with intensive heat removal from friction zone of the insert and crank journal of the shaft.

2 dwg

Description

The invention relates to tribotechnology, and in particular to the field of wear-resistant plain bearings.

Regular microrelief plain bearings can be used as a replacement for standard plain bearings with longer plain bearings. The use of bearings with regular microrelief can be carried out both in the development of new equipment, and in the repair of worn-out [1, 2].

From technical and patent information, methods are known for increasing the operating life of sliding bearings by creating a regular microrelief on the inner surface of the bearings of the sliding bearings (usually bronze, brass, babbit).

A well-known sliding bearing with a regular microrelief containing a liner, on the inner surface of which there are longitudinal sinusoidal macro grooves that do not reach its ends, and micro grooves with predetermined width and pitch are made between the macro grooves and are comparable with the maximum liner wear (certificate of the Russian Federation for utility model No. 34981, IPC F16C 33/00, published on December 20, 2003, (prototype)) [3]. The profile of macro- and microgrooves after blast-abrasive treatment is smoothed, which contributes to the formation of a continuous film of oil and liquid friction in the “insert-shaft” contact when the shaft rotates. When starting and stopping the rotation of the shaft, the presence of micro grooves and oil in them allows for any friction of the shaft, practically "from zero", to provide fluid friction in the contact zone of the shaft and the inner surface of the liner, which reduces friction and, accordingly, increases the durability of the sliding bearing.

The main disadvantage of this bearing with regular microrelief (prototype) is that it is made of soft metals, usually bronzes according to GOST 5017-74, brass, tin and lead babbits according to GOST 13020-74, GOST 1209-90. Such liners, even if there is a continuous lubricating film in the bearing assembly and the occurrence of hydrodynamic friction, will wear out quickly enough due to the natural contamination of the lubricant (abrasive wear), hydrogen wear as a result of spraying (“pumping”) of the friction surface layers with hydrogen, aging of the lubricant during prolonged operation, partial transition to boundary and mixed friction during periods of starting and stopping shaft rotation.

Another significant disadvantage of the prototype is that when the bearing in question does not take into account a significant reduction in wear due to the use of metal-cladding additives to oils, which ensure the appearance of protective servovitic films of soft metals and polymer surfacing films on the friction planes during the occurrence of wearless friction, which, reducing wear , lead to another positive effect - they prevent the heating of lubricants and an increase in temperature on the friction planes of the bearing.

The objective of the invention is to significantly increase the wear resistance of the bearing assembly and reduce the temperature in the friction zone of the liner and the main shaft journal.

The technical effect is achieved by the fact that the plain bearing with a regular microrelief contains a liner, on the inner surface of which longitudinal sinusoidal macro-grooves are made, not reaching its ends. Between the macro grooves, micro grooves with predetermined width and pitch are made. The bearing is characterized in that it is additionally equipped with a removable steel sleeve pressed onto the main shaft journal, on the outside of which a regular microrelief is applied, the width and pitch of which are equal to twice the maximum linear wear of the plain bearing shell. The bearing shell has a smooth surface without a microrelief on its inner surface. The bearing is equipped with a forced supply of lubricant with metal cladding additives, providing between the bearing liner and the outer surface of the steel sleeve with a regular microrelief of a servo-like, including copper, film ~ 1 ... 2 μm thick, which significantly increases the bearing life and its durability due to the intensive heat removal from the friction zone.

Figure 1 shows the node of the inventive sliding bearing.

Figure 2 - fragment I of figure 1 - the nature of the surfaces of the bearing shell and the regular microrelief of a steel removable sleeve, pressed onto the main shaft journal.

The bearing assembly consists of a bed 1, a shaft 2, which rotates in bearings 3 with anti-friction liners 4. A removable steel sleeve 5 is pressed onto the main neck of the shaft 2, the outer surface of which 6 is equipped with a regular microrelief, the width and pitch of which are equal to twice the maximum linear wear Uл max slip liner, which is closed from the end by a cover 7 and two sealing gaskets 8 and 9. In the cover 7 there is a fitting 10 for forcing lubricant from the end of the shaft 2 to the friction surface 6 between the liner 4 and steel sleeve 5.

The bearing assembly operates as follows.

Shaft 2 is given rotation from the drive of the device. A sleeve 5 with a regular microrelief is pressed onto the main neck of the shaft 2, the width and pitch of which are set and equal to 2 U max.

Through the fitting 10 of the cover 7, a lubricant with metal-cladding additives is forcibly supplied, which ensures friction between the liner 4 made, for example, of bronze, and the steel sleeve 5 with a regular microrelief on its surface 6, servo-shaped, for example, thin quasi-liquid copper (1- thick 2 μm) film. The friction of the bronze liner on a copper servo film significantly reduces wear, increases the wear resistance and durability of the bearing, since it is replaced by friction “soft metal (bronze) on hard metal (steel)” by friction “soft metal (bronze) on soft metal (copper)”, which leads to reduced wear. In addition, the copper servo film on the surface 6 intensively removes heat from the friction unit, the temperature in the friction unit decreases, which further reduces wear, increases the wear resistance and durability of the bearing. The durability of the inventive bearing also increases due to the fact that the wear of the microrelief on the steel sleeve 5 compared with the wear, for example, of the bronze liner 4 is several times less than the wear of the bronze liner 4 and is inversely proportional to the tensile strength of the bronze liner 4 and steel sleeve 5, what is achieved the technical effect of the claimed invention.

Information sources

1. Garkunov D.N., Melnikov E.L., Gavrilyuk B.C. Tribotechnology. Short course. Tutorial. MSTU named after N.E.Bauman. Moscow, 2008 .-- 308 p.

2. GOST 24773-81 Regular microrelief.

3. Certificate of the Russian Federation for utility model No. 34981, IPC F16C 33/00, publ. 12/20/2003. Regular microrelief plain bearing (prototype).

Claims (1)

A plain bearing with a regular microrelief, characterized in that it is additionally equipped with a removable steel sleeve pressed onto the main shaft journal, on the outside of which a regular microrelief is applied, the width and pitch of which are equal to twice the maximum linear wear of the plain bearing shell, the bearing shell has a smooth surface without a microrelief on its inner surface, the bearing is equipped with a forced supply of lubricant with metal cladding additives, providing and forming a bearing between the liner and the outer steel sleeve surface with regular servovitnoy microrelief, including copper film thickness of ~ 1 ... 2 mm.

Images