RU2706756C1 - Bearing fixing device on shaft - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to design and production of mechanisms and machines and can be used in production and restoration of bearing assemblies of various configurations. Device for attachment of bearings on shaft comprises expanding sleeve with longitudinal connector, external cylindrical and internal conical surfaces, and its system of movement into gap between tapered shaft surface and lower bearing ring cylindrical surface, the latter consists of tensioning screw that holds tensioning disc with separator ring and balls inserted therein, retaining nut and locking ring. Required degree of bearing tension is set by value of axial movement of expanding sleeve or angle of rotation of tensioning disc, and its contact with expanding bushing occurs through separator with balls.

EFFECT: creation of device for attachment of bearings on shaft, in which there is no need in special equipment and removal of shaft with bearings from working zone.

1 cl, 1 dwg

Description

The device relates to the design and manufacture of mechanisms and machines and can be used in the manufacture and restoration of bearing assemblies of various configurations.

A device for mounting and mounting bearings on shafts is known, and the bearings are kept on the shaft from turning due to the stress state of the surfaces of the shaft and the inner ring of the bearing. For example, similar arrangement of bearings is used in the gearboxes of metal-cutting machine tools (RF patent No. 863941, published September 15, 1981, bulletin No. 34).

Also known is the axle box bearing unit of the wheels of the railway transport, it contains a two-row block of roller bearings, perceiving the radial and axial load when the vehicle is moving. The bearing with cylindrical rollers is mounted on the outside of the axle box. A bearing with tapered rollers, perceiving both radial and axial loads, is located on the inside of the axle box. An interference fit in a roller bearing is provided by installing a deformable annular sealing gasket under the bearing and flange mounting flanges (RF patent No. 2649106, published November 16, 2017, Bulletin No. 10).

The disadvantage of these devices is the need to use special equipment to install and remove the bearing, remove the mounted assembly from the working area. Moreover, as the size of the shafts increases, the complexity of these works increases many times.

The technical task is to create such a device for installing and changing bearings, in which there was no need for special equipment and removing the shaft with bearings from the working area.

The problem is solved by the use of a special expansion sleeve with an axial connector, an inner conical, and an outer cylindrical surface, which is mounted on the conical surface of the shaft. Due to the movement of the sleeve along the axis of the shaft, an increase in its outer diameter occurs, the necessary contact of the shaft and the inner ring of the bearing is created. As a result, the inner ring of the bearing elastically deforms and rotates together with the shaft and the expanding sleeve.

The essence of the device is illustrated by the scheme, where in FIG. 1 shows a diagram of the installation of the expansion sleeve on the shaft and bearing rings on the expansion sleeve.

The bearing 1 is held onto the shaft 2 by means of an expansion sleeve 3. It is fixed to the shaft by the tension disk 4 located on the tension screw 5. The position of this screw in the shaft is limited by the stop 6. The movement of the disk along the screw is controlled by means of the lock nut 7 and lock washer 8. The position of the bearing in the housing on the shaft is limited by the cover 9. Between the end of the expanding nut and the supporting surface of the disk there is a separator 10 with balls 11, rods 12 are screwed into the holes of the disk, holding the disk 13 with the inner usnoy surface.

By rotating the tension disk 4, the expansion sleeve 3 is brought into contact with the inner ring of the bearing, while the free movement of the ring relative to the sleeve and the movement along the axis of the shaft disappears. Further introduction of the sleeve into the bearing ring creates the necessary interference. The necessary movement of the sleeve is calculated from the ratio

$$P=H\cdot O_k$$

_,

where H is the received radial interference,

About _{to the} inverse taper of the inner surface of the sleeve,

, $$O_k=\frac{L}{k}$$

,

where L is the length of the conical surface, k is the increase in the radius of the conical surface at this length.

The amount of movement P creating the necessary contact between the bearing and the shaft is controlled by:

1) caliper to change the gap between the disk 4 and the lower bearing ring,

2) on the limb placed on the cylindrical surface of the expansion sleeve, the angle of rotation of the disk 4 relative to the expansion sleeve from the ratio

N= П/t_хв , $$N=\frac{P}{t_{x\mathrm{in}}}$$

N = П / t _хв ,

where N is the number of revolutions of the disk 4, t _xv is the pitch of the screw 5.

The use of this invention provides advantages as a high quality device connecting shafts and bearings. These advantages are especially evident when bearings are repeatedly replaced and reinstalled due to the formation of surface defects on the shaft during disassembly of the joint under traditional conditions, which is associated with the movement of the ring under conditions of plastic deformation along the shaft during disassembly of their joints. Having opened the screw, rotating the tension disk in the opposite direction, remove the tension nut using rods 12 and disk 13 from contact with the bearing ring, making it possible to remove the bearing.

Claims (1)

A device for mounting bearings on a shaft, characterized in that it contains an expanding sleeve with a longitudinal connector and an inner conical surface, and a system for moving it into the gap between the conical surface of the shaft and the cylindrical surface of the lower bearing ring, which consists of a tension screw holding the disk moving along it tension with a separator ring and balls inserted into it, a lock nut and a lock ring, and the required degree of bearing tension is set according to the value of the axial the expansion sleeve or the angle of rotation of the tension disk, and its contact with the expansion sleeve occurs through a cage with balls.

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