UA110846U - SLIDING BEARING - Google Patents

Abstract

The sliding radial bearing contains a housing-mounted insert with structural members for the introduction of liquid oil into the friction zone. The insert is made of a square cross-section of elastic wear-resistant material in the form of a cylindrical helix with a gap between the coils of the helix 0.3 ... 0.5 mm, and between the gap and the coils of the spiral a groove through which the oil is introduced into the friction zone.

Description

The useful model belongs to the field of mechanical engineering, namely to the sliding friction nodes of heavy technological and power equipment, provided there are liquid lubrication systems.

A known radial fluid friction bearing contains an insert mounted in the housing, on the working surface of which oil-retaining segmental grooves are made parallel to the ends (a.s. USSR Mo 863903 kl. E16С 33/10 1981), as well as a bearing in the middle of the working surface of which an annular oil supply groove and oil pockets are made, evenly placed on both sides of the groove in a checkerboard pattern at an angle of 120" (patent of Ukraine Me38601 kl. Е16С 17/02 2001. The disadvantage of these bearings is that the area of the grooves and pockets is 15. ..20 95 of the friction surface, due to which the bearing capacity and wear resistance of the contact surface decreases accordingly.

The closest to the proposed useful model "Radial sliding bearing" in terms of a set of features is the well-known sliding bearing (patent of Ukraine Me 60516 kl. E16С 33/10 2003 - the closest analogue, which on the contact surface of the insert has radial oil supply holes connected to each other axial holes, which in turn are connected to the lubrication system with an annular groove. The presence of numerous through holes in the body of the insert, made in the form of a cylindrical bushing, also weakens the bearing capacity of the contact surface and the strength of the bushing, makes it impossible to mount the bushing in the bearing housing with sufficient tension and creation of favorable tensions of the sliding surface.

The basis of the useful model is the task of increasing the wear resistance and improving the conditions of liquid lubrication of the sliding bearing.

The task is solved by the fact that the bearing insert is made in the form of a cylindrical spiral, on the inner surface of which tangential compressive stresses are created.

The bearing insert is obtained by winding an elastic wear-resistant rod of square section on a cylindrical core, the diameter of which is equal to the diameter of the shaft mated with the insert. A gap of 1...2 mm is maintained between the turns of the spiral. The length of the spiral is assigned equal to the length of the shaft body plus the size of the side of the square section of the bar. According to the outer diameter of the spiral, a hole is made in the bearing housing, into which the spiral is freely inserted and both flat ends of the insert are ground, removing an allowance equal to 0.5 of the size of the side of the square

From the cross section of the rod.

The drawing shows an axial section of the proposed sliding bearing. The bearing consists of a screw cylindrical sleeve 1, inserted in the housing 2 and compressed by covers 4 and 5 in such a way that a gap of 0.3...0.5 mm remains between the turns of the insert. Cover 5 has a threaded hole a for introducing lubricant from the liquid lubrication system, and cover 4 has a threaded hole b for removing lubricant from the lubrication system. Gaskets 3 provide sealing between the housing 2 and covers 4 and 5. Covers 4 and 5 are attached to the housing 2 with screws.

The bearing works as follows. When the insert 1 is compressed by screws and covers 4 and 5, the outer diameter of the insert increases and it fits tightly to the body 2, and tangential (circular) stresses are created on the inner surface of the insert, which are opposite in sign to the working stress of stretching the contact surface of the insert in the process of friction. At the same time, working stresses in the contact zone are reduced and, accordingly, the wear resistance of the bearing improves.

Lubricant from the liquid lubrication system through the threaded hole a in the left cover 5 is fed into the upper axial groove of the housing 2 and then is introduced into the screw groove with a width of 0.3...0.5 mm, formed due to the gap between the turns of the insert 1. The lubricant evenly lubricates friction contact surface of the shaft and insert. The movement of the lubricant through the screw groove intensively cools the side walls of the turns of the insert 1, carries the wear products into the lower axial groove of the housing 2 and through the threaded hole b in the right cover 4 is drained into the lubrication system.

If there is (within tolerance) misalignment of the shaft relative to the bearing, the contact surface of the bushing adjusts itself due to the elastic deformation of the turns, becomes tangential to the surface of the shaft and the contact area practically does not change.

Claims (1)

USEFUL MODEL FORMULA A radial sliding bearing containing an insert mounted in the housing with structural elements for the introduction of liquid lubricant into the friction zone, which is distinguished by the fact that the insert is made of a square rod made of elastic wear-resistant material in the form of a cylindrical spiral with a gap between the turns of the spiral 0.3... 0.5 mm, while a helical groove is formed between the gap and the turns of the spiral, through which lubricant is introduced into the friction zone. in: - With and: - and there is that) with chd y . . . ; et and nshshshshshish В В Б : ши ж; GE s She Pk i o in U z i