SU1751510A1 - Bearing assembly - Google Patents

Abstract

Use: mechanical engineering, in bearing units with preload. SUMMARY OF THE INVENTION: The outer rings of the bearings are fixed at the ends by means of a deformable spacer sleeve interposed between them. A thread forming the connection with the housing is made on the remote element and centering the cover over the outer diameter, and the distance element is located between the ends of the outer ring of the bearing and the cover. 4 il.

Description

The invention relates to mechanical engineering and can be used in the development of design technical solutions for bearing assemblies with radial-stop ball and roller bearings, in which, when assembled in a duplex, it is necessary to create a predetermined axial clearance or preliminary tension.

The purpose of the invention is to increase the reliability and durability of the bearing assembly.

The goal is achieved by the fact that the bearing assembly containing two angular contact bearings mounted in the housing and on the shaft according to the X-duplex scheme, the lid with the centering of the rim and the spacer element, is fitted with a deformable spacer bushing installed between the outer rings of the bearings. In the housing and on the outer surfaces of the remote element and the centering cover, a thread is made, and the spacer element is installed in the housing on the thread between the ends of the outer ring of the bearing and the cover.

FIG. 1 shows the design of the bearing assembly; in fig. 2 is a diagram of the action of forces in a threaded joint of a bearing assembly, according to which the threads of the remote Element 3 and the lid 2 are loaded after assembly by axial forces acting in diametrically opposite directions; in fig. 3 - the same. Between the outer rings of bearings 4 and 5, a deformable spacing sleeve 6 is installed, which, during assembly, loads the threads of the remote element 3 and the cover 2 in one direction; FIG. 4 is a force-deformation diagram of a deformable distance sleeve, which shows the maximum allowable deformation of the TORNEL TO MOMVNTE and the corresponding maximum axial compression force Rmax.

The bearing assembly includes a housing 1, a lid 2 with a thread in outer diameter 2, a spacer 3 with a thread in outer diameter, bearings 4 and 5 with outer rings mounted in housing 1 according to the X-dup eX diagram, deformable

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the spacer 6, located between the ends of the outer rings of the bearings.

For example, a bearing unit of a drive gear of a truck or passenger car gearbox comprises a housing 1, a cover 2 and a spacer 3, having a thread with outer diameters that form connections with the housing 1.

The initial data on the assembly of the bearing-10 unit:

- dimensions of bearings

-threaded connection in the housing 128У 1.5; 15

. - the bearings must be compressed with an axial force of about 300-400 kg, which is specified in the technical conditions for the moment of friction MTP when the shaft in the bearings rotates within 3-0.4 kgm; 20

-internal bearing rings fixed on the shaft by means of a threaded connection on the shaft stem M 33 1.5 at the tightening torque M3 30-35 kgm, which corresponds to an axial compressive force of 5-5.5 tons 25 (see Fig. 1) g

- the moment of tightening the cover Me 25-35 kgm, which corresponds to an axial compressive force of 1.5-2 tons;

- a compression unit with a deformable spacer 30 installed between the narrow ends of the outer rings of bearings, with the following geometrical parameters: outer diameter 124.5 mm; internal diameter 117.5 mm; 35 deformable section with a length of 15 mm and a thickness of 1.5 mm, has a concavity of 2 mm.

When assembling a bearing unit of the proposed design (Fig. 1) with a deformed spacer sleeve 6 between 40 narrow ends of the outer rings of bearings 4 and 5 using a remote element 3 with a thread M 128 1.5 deforms the spacer sleeve, selects gaps in bearings 4 and 5 and it creates 45 required prednat g for the moment of training

, 3-0,4 kgm, with an axial compressive force of 300-400 kg, while the force developed in the threaded connection will be from 800 to 2500 kg. A part of this force — large — will fall on the deformation of the deformable spacer sleeve 6, and the other part — on the creation of preload in bearings 4 and 5, while ensuring the reliability of the threaded connection, since the turns of the thread on the outer diameter of the remote element 3 and cover 2 pressed to one side, i.e. the possibility of a gap in the threaded connection is excluded,

The use of a bearing unit of the proposed design, in which a deformable spacing sleeve 6 installed in housing 1 according to the X-duplex scheme is installed between the outer rings of bearings 4 and 5, will improve the reliability and durability of the bearing by fastening the outer rings along the ends using axial compression and elimination the possibility of turning the outer rings and loading the two threaded connections in one direction, which will increase the support rigidity under the action of an external axial operating load, which will be distributed over a larger number of turns of threaded connections.

Claims (1)

Claims of the Invention A bearing assembly comprising two radial-thrust bearings installed in the housing and on the shaft according to the X-duplex scheme, a lid with a centering of the rim and a spacer element, so that, in order to increase the reliability and durability of the bearing, it is equipped with Between the outer rings of the bearings, a deformable spacer sleeve, while in the housing and on the outer surfaces of the remote element and the centering of the cover, a thread is made and the remote element is installed in the case on the thread between the ends of the outer ring of the bearing and cover. . s  6 Fwi  on the side of reya 9 UB.- 1H№ + $ 00 external tma jaMcmgygr only on the element 1 fzg.2  § eRm 2500 .X 8oo & e