SU472217A1 - Safety coupling - Google Patents

Description

one

The invention relates to general engineering and can be used to reliably protect against overloads and oscillations of the rotation mechanisms of tower cranes.

A known safety coupling comprising concentrically arranged driven and leading half couplings interconnected by rolling bodies. The drive coupling half is made in the form of a hollow shaft carrying a separator with windows for rolling elements. A damping element is installed inside the shaft, made in the form of a torsion shaft.

The purpose of the invention is to eliminate torsional and shock vibrations by improving the damping properties and ensuring the reversibility of movement.

For this, the damping element of the proposed coupling is made in the form of an adjustable compression spring, and the shaft is equipped with a screw-nut mounted on it, and has a polyhedron-shaped section in contact with the rolling bodies interacting with the grooves on the inner surface of the driven half-coupling when operated, the number of which corresponds to the number p Dov bodies of rolling, and between the driven half coupling and separator concentric them placed elastic cylinder with holes under the body rolling,

installed in the windows of the separator with a side gap.

FIG. 1 shows the described coupling, a longitudinal section; in fig. 2 - balls; a - 5 at the time of engagement, b - at the time of braking or reverse, c - at the time of actuation; in fig. 3 - separator with rolling elements.

Driven half coupling 1 is rigidly fixed in the hub of the ring gear. Internal

0, the working surface of the coupling half 1 has annular grooves 2 according to the number of rows of rolling bodies depending on the transmitted moment. Leading coupling half is made in the form of a hollow shaft 3 having a section in the form

5 polyhedron. Its flat faces are in contact with the balls 4, located in the separator 5, rigidly mounted on the shaft 3.

The windows for the balls in the separator are made with side gaps .4 in the direction

0 rotation, ensuring the seizure of the balls. Shaft 3 is connected to nut 6 by a multiple-thread rectangular thread. The nut 6 has a left thread on the outer surface and the latter is connected with the carrier 7.

5 The nut 6 in the axial direction can only be raised, since it is moved downwards and is limited by the spring ring 8. The hollow shaft 3 relative to the nut G can only be raised by the amount of the trip stroke.

0 The movement of the hollow shaft 3 down the guide thread is limited by the washer 9. The screw pairs 7-6 and b-3 play the role of guides, and therefore their parameters and material are selected with the calculation in order to ensure minimum wear. Inside the casing 3, there is a slatted or annular (last preferred) spring 10, which at one end abuts against the thrust bearing 11 (or iodot) and the other into the spacer sleeve 12.

The thrust bearing is iodized by the adjusting sleeve 13, which is threadedly inserted into the hollow shaft 3 and secured against turning, and the iodine seal is in the adjusted state. The elastic cylinder 14 is in contact with the surface of the coupling 1 and its openings with the balls 4. The cylinder 14 is pressed against the surface of the coupling half 1 and due to the trenters it tends to rotate along with the latter. The elastic cylinder provides the wedge angle of the balls 4 and the operation of the coupling and reverse movement.

The rotation from the carrier 7 is transmitted through screw wedged pairs 7-6, 6-3 to shaft 3. Wedged between the inner surface of the driven coupling half 1 and the flat faces of the shaft 2, the balls 4 thereby provide a firm adhesion of the drive and driven coupling.

When reversing or braking the mechanism and the occurrence of a difference in the angular velocities of the master and slave coupling halves, the elastic cylinder 14, constantly in contact with the balls 4, provides a wrap angle and coupling operation regardless of the direction of the power flow in the kinematic chain.

If the transmitted torque does not exceed a predetermined limit value, the difference between the spring force of the spring and the axial force of the pair of wires is sufficient to transmit torque torque by means of friction.

As the torque increases and the maximum possible value is reached, this difference decreases, the hollow shaft 3 together with the balls 4 and the separator 5 rises along the thread pairs 7-6 and 6-3 (depending on the direction of rotation). The balls 4 enter the annular grooves 2 of the driven I-coupling 1, where the hollow shaft 3 is further rotated relative to the driven coupling half 1, thereby increasing the wedging angle, but no further jamming will occur, as the side clearance between the balls and the separator slots will be selected and they will develop to rotate with a separator, do not get jammed; the clutch will operate (Fig. 2c).

Screw couples 7-6 and 6-3 allow you to transfer torque to both sides.

The use of the described coupling in crane rotation mechanisms reduces the oscillation of its design, thereby improving the working conditions of the crane driver, especially the hinged crane

towers to the swing frame.

Subject invention

Safety clutch containing

concentrically arranged and interconnected by the rolling bodies of the half-coupling, driven and driven, made in the form of a hollow shaft, carrying a separator with openings for rolling bodies and having a damping element with a wipe, characterized in that, in order to eliminate torsional and shock vibrations by improving damping properties and ensuring the reversibility of movement, the damping element is made in the form of an adjustable compression spring, and the shaft is equipped with a screw-nut mounted on it, and has a polyhedron-shaped portion in contact with those s rolling interacting when triggered with grooves on the inner ioverhnosti driven iolumufty whose number corresponds to the number of rows qual bodies, and between the separator and the driven iolumuftoy them concentrically arranged cylinder resilient apertured under

rolling bodies installed in the separator windows with side clearance.

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