SU621935A1 - Worm drive - Google Patents

Description

(54) WARM DRIVE

The invention relates to the area of the pipeline a-armature, namely To drives containing a gear (worm) transmission with a device for limiting torque.

A worm gear is known, in which the force of the screw and the axial displacement of the screw of the spring descends and the gap is sampled.

The disadvantages of the known drive are the impossibility of limiting the transmitted torque, since with a further increase in the force the mechanism loops.

Also known is a worm drive with a friction device | stvym to limit the torque, on the shaft of which the worm is placed, (Interacting with the friction device noiGpeioiCTBOiM levers.

I believe that the levers in this drive do not ensure the stability of the clamping of the friction surfaces, thereby reducing the accuracy of limiting the torsion bar and causing dynamic loads at the moment of closing.

The purpose of the invention is to reduce Dilicacio neiperpysoK by increasing the accuracy of the torque limit.

To do this, in the proposed screwdriver, on the shaft, there is a sleeve with a shoulder, on which a screw is mounted with rotation and axial displacement relative to it, having a friction end in contact with the sleeve of the sleeve, and on the sleeve there is an elastic element, for example a spring package, pressing the screw to.

The drawing is explained in the drawing. The cherv drive contains a worm to

Claims (3)

is engaged with the worm gear 2. The worm to 1 is placed on the hub 3 with the possibility of rotation and axial movement relative to it. In screw I, one end 4 is friction and in contact (with a shoulder 5, bushings 3, and the opposite end through a thrust ball bearing 6 is tightened with a packet of disc springs 7 by means of an adjusting nut 8. Sleeve 3 on the inner surface and | there are slots included shaft 9 rests on the OD1NO side on the thrust conic bearing W placed in the drive housing, and on the other hand through the sleeve 11 on the thrust bearing 12. (Between the adjusting nut 13, ra; offset on the sleeve 11, and a nut 8 is located spring 14 compression. At a distance D from the end of the nut 8 is a lever ./5, to, the switch, the contacts of which are included in the circuit of the magnetic starter or contactor, which turns off the drive electric gun. Sleeve 3 has the possibility of axial movement determined by the saoipoM b between lOipuoM sleeve 3 and the end face bushings //. When the drive is operating with a load not exceeding the limiting value, the device operates as follows. Under the action of the force of the disk baffles 7, to the front end 4 with the friction surface is pressed to (the shoulder of the sleeve 3 and held against crank sleeves 3. The rotating motor, the moment of the shaft 9 is transmitted. Through the sliding connection (sleeves 3 and the worm to 1 Worm (wheel 2. At the same time, the sleeve 3 with the screw 1, the pliers 6, the cup springs 7, the nut 5 is in the leftmost position, and the force of the spring .14 compression compensates for the axial force that occurs on the worm during the transmission of the torque M0 | transfer. With increasing eafuzzhi and torque in the ir (the water is higher than the nominal coOTIBETICTBeHHo increases the axial force acting on the camshaft1. Sleeve 3 together with the worm J, detachable1 (com 6, with a set of dish-shaped springs 7, the nut 8 moves with a wedge of the worm 7, the wedge of the springs 7, the wedge of the wedge springs 7, the wedge J, moves 1) In the iris position, compressing the spring 14 and selecting the gaps b and A. When the gap bushing 5 rests on the tare of sleeve 11, and at the gap ne, the lever 15 moves and the electric motor is turned off. With a further increase in torque, the zero force on the worm increases ke / and squeeze t (pa.ket dish-shaped guns 7. The force to press the friction surfaces of the end face of the worm / and. sleeve 3 is reduced, they slip relative to each other, i.e. turn the worm / relative sleeve 3. The worm transmission does not transmit the torque .MOiMCHT - the device has worked immediately. To reduce the torque during overloads, the clearance L can be set to an approved value less than the clearance, that when the torque is deducted above the limiting value, the electric motor is first disconnected (at), and then the friction surfaces slip (at 6 0). Claims: Worm drive pipe (wire fittings, on the shaft of which there is a screw and a friction hole, characterized in that, with a gap diminishing dynamic overloads, on the shaft is located a sleeve 1C 1burt, on which with the possibility of rotation and axial movement from 1NO | It is fitted with a worm to, having a friction end in contact with the shoulder (sleeves, and on the sleeve is placed an elastic element, for example a spring package, pressing the worms to.,