Interference joint

FIELD: mechanical engineering.

SUBSTANCE: invention can be used in shaft-bushing interference. According to invention, shaft and bushing are made of material with similar physical and mechanical properties with projections in form of laser hardened paths. Pitch of parts is twice as great as their width. Paths are arranged at angle of 0-90° to axis of joint. Opposite paths of shaft and bushing are displaced relative to each other by width of part. In particular cases, paths can be arranged along ring lines lying in planes square to axis of joint, in starting lines parallel to axis of joint, or helical lines.

EFFECT: increased load-carrying capacity of joint.

4 cl, 4 dwg

 

The invention relates to mechanical engineering, in particular to compounds with tightness details type shaft sleeve for mating cylindrical surfaces.

It is known connection with tightness details type shaft sleeve having mating cylindrical surfaces, one of which made the relief in the form of protrusions hardness greater than the hardness of the material other connected details, and depressions, and the relief caused by high-speed point-pulsed melting of the metal surface, for example by laser radiation (see the description of the invention to the author's certificate of the USSR No. 1199558, the IPC 23 R 11/02, publ. 23.12.1985 year).

A disadvantage of the known connection is that the tabs do not form a continuous line clutch shaft and bushing along the length of the contact, which causes insufficient load capacity.

It is known connection with tightness details type shaft sleeve having mating cylindrical surfaces with different physical-mechanical properties, such as surface hardness, while an item with a greater surface hardness is made with grooves on its surface (see the description of the invention to the patent of Russian Federation №2106544, IPC F 16 4/00, publ. 10.03.1998,).

The disadvantage of this known compound, taken as a prototype, is the fact that the implementation of the grooves weaken the cross-section of connection is accused of parts, leads to the formation of zones with significant stress concentration around the grooves and the formation of cracks during operation, which causes insufficient load carrying capacity of joints with tension.

The task of the invention is to increase the load capacity of the connection with tension.

The essence of the invention lies in the fact that in connection with tightness details type shaft sleeve having mating cylindrical surfaces of the shaft and sleeve are made of the same material with the same physical and mechanical properties, with bumps in the tracks of a laser hardening width and step 2A, angled 0-90° to the axis of the connection, and the other tracks of the shaft and sleeve are displaced relative to each other in width and track.

In addition, when performing tracks at an angle of 90° to the axis of the connection shaft and the sleeve tracks are located along the circular lines in the planes perpendicular to the axis of the connection.

In addition, when performing tracks at an angle 0° to the axis of the connection shaft and the sleeve tracks are parallel to the axis of the connection in a straight line.

In addition, when performing tracks at an angle other than 0° or 90° to the axis of the connection shaft and the sleeve tracks are arranged along helical lines.

This allows to increase the load capacity with the organisations with tension.

The invention is illustrated by drawings, where:

figure 1 shows the connection tightness, General view in the section.

figure 2 - the same, the section a-A.

figure 3 - the same, running tracks at an angle of 90° to the axis of the connection.

figure 4 - the same, running tracks at an angle 0° to the axis of the connection.

Connection with tightness contains (1) the shaft 1 and the sleeve 2 having mating cylindrical surfaces. The shaft 1 and sleeve 2 are made of the same material with the same physical and mechanical properties, with the tabs in tracks 3 laser hardening width and step 2A, angled 0-90° to the axis of the connection, and the other track 3 of the shaft 1 and sleeve 2 are displaced relative to each other in width and track 3.

When performing 3 tracks at an angle of 90° to the axis of the connection on the axis of the connection shaft 1 and sleeve 2 track 3 are located along the circular line 4 in the planes perpendicular to the axis of the connection (see figure 3).

When performing 3 tracks at an angle 0° to the axis of the connection shaft 1 and the sleeve 2 track 3 parallel to the axis of the connection by the straight lines 5 (see figure 4).

When performing 3 tracks at an angle other than 0° or 90° to the axis of the connection shaft 1 and the sleeve 2 track 3 arranged along helical lines 6 (see figure 1).

Connection with tightness works as follows: the connection with tightness, consisting of the shaft is 1 and the sleeve 2 (2), on the contacting surfaces of which are covered with the tracks of a laser hardening width and step 2A, which are normal to the vector of the shear force. With opposite track shaft and bushing are made with an offset from each other in width and track.

When run on the contacting surfaces of the shaft and sleeve tracks a laser hardening in the areas of laser influence is formed of fine martensite with in comparison with the structure of the original material of greater hardness and a large specific volume, resulting in zones of laser influence protrusions are formed. The height and width of lanes depending on the mode of hardening and power of the laser used may vary. Thus, when the laser hardening the surface of a cylindrical part made of steel 45 GOST 1050-88 when the laser power is 1 kW and the diameter of the focused laser beam 5 mm depending on the speed of processing the height of the track may vary in the range from 3 to 25 μm, the width of the track from 2.5 to 6 mm

When assembling the connection with tensioning ledges form a coupling that with application of an external load provides increased load capacity and sdvigoustojchivosti mates that eliminates the need for grooves on the cylindrical surfaces of the connected parts and cracks.

P and loading connection with tightness axial shifting load, to prevent shifting of the shaft relative to the sleeve tracks a laser hardening shaft and bushing must perform an annular shape at an angle of 90° to the axis of the connection.

Connection with tightness, operating in the torque transmission path of the laser annealing, is performed under an angle of 0° to the axis of the connection straight stripes parallel to the generatrix.

While loading connection with tightness torque and shear force paths of laser hardening perform a spiral line that prevents the disclosure of the junction as torque and axial force.

The claimed invention allows to increase the load capacity of the connection with tension.

1. Connection with tightness details type shaft sleeve having mating cylindrical surfaces, characterized in that the shaft and sleeve are made of the same material with the same physical and mechanical properties with protrusions in the form of tracks of a laser hardening width and step 2A, angled 0-90° to the axis of the connection, and the other tracks of the shaft and sleeve are displaced relative to each other in width and track.

2. The compound according to claim 1, characterized in that when performing tracks at an angle of 90° to the axis of the connection shaft and the sleeve tracks are located along the circular lines in the planes perpendicular to the axis of the connection.

3. Connect the Addendum according to claim 1, characterized in that when performing tracks at an angle 0° to the axis of the connection shaft and the sleeve tracks are parallel to the axis of the connection in a straight line.

4. The compound according to claim 1, characterized in that when performing tracks at an angle other than 0° and 90° to the axis of the connection shaft and the sleeve tracks are arranged along helical lines.



 

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