SU929906A1 - Magnetic coupling - Google Patents

Description

(5) MAGNETIC COUPLING

one

The invention relates to mechanical engineering and can mainly be used in a drive), which should change the value of the transmitted i. torque at reverse. In particular, the invention may find application in sealing and depressurization drives of heat generating assemblies in nuclear channel type reactors.

The known magnetic coupling, which contains two half-couplings with permanent magnets mounted on them.

The disadvantage of this clutch is that it is not possible to regulate the torque transmitted and limited by them.

A known magnetic coupling in which permanent magnets are mounted on the driving and driven coupling halves, but to adjust the torque, one of the coupling halves is axially displaceable on the shaft and has a helical mechanism that allows

manually adjusting the relative position of the coupling halves in the axial direction, which changes the flow coupling between the driven and the leading coupling halves, and consequently, the transmitted moment.

However, the known clutch does not automatically change the torque when the clutch is rotated in opposite directions, since when reversed, the mutual axial arrangement of the coupling halves does not change.

The aim of the invention is to provide an automatic change in the torque transmitted by the clutch during the reverse.

This goal is achieved by the fact that the magnetic coupling containing a movable coupling half mounted on the shaft with the possibility of axial movement by means of a screw and a nut interconnected, a fixed half coupling and permanent magnets mounted on the coupling half are fitted with

mounted on the shaft asymmetrically with respect to the magnets of the fixed half coupling with stops for the movable coupling half, and the latter fixed to the nut associated with the screw.

The drawing shows the coupling cut.

The coupling consists of half coupling 1 and axially movable coupling half 2. On the coupling halves, permanent magnets 3 are installed. The moving coupling half is coupled to the shaft along a helical surface, such as a thread, between stops 5 and 6. To reduce the dynamic forces that occur between the stops and a movable coupling half when reversing at low speeds of rotation, shock absorbers 7 are introduced into the structure. In the position shown in the drawing, the magnets 3 on both half coupling half operate together over the entire area. Therefore, in this position, the clutch transmits the maximum cool: low moment. In a case when the half coupling 1 - I conduct. coupling and coupling half 2 are known, the coupling works as follows. The transmission of the maximum torque is possible under the condition that the half coupling 1 rotates in the direction opposite to the screw-on top. shaft 4. When the coupling half is rotated in the opposite direction (in the direction of the screw surface of the shaft) of the coupling half. 2 rotates synchronously with half coupling 1 and at the same time under the action of tangential magnetic forces moves along the shaft to the stop 6 (the moment of friction over the screw surface is less than the moment of resistance drive) magnetic coupling, overcoming the moment of resistance of the drive, begins to rotate the shaft k. The magnets 3 half couplings 1 and 2 in this position interact only with a part of their magnetic fields, which leads to a decrease in the magnitude of When the direction of the coupling (reverse) of the half-coupling half coupling 2 begins to move in the direction from the stop b to the stop 5 on the stationary shaft. And only when the coupling half 2 reaches the stop 5 and is rigidly coupled to the shaft C, the latter begins rotate. In this position

1ufta transmits maximum torque since the magnets 3 of both couplings interact over the whole area

In the case when the coupling half 2 - I drive, schA, and the coupling half 1 is known, the clutch works as follows.

Claims (2)

Transmission of maximum torque is possible under the condition of rotating shaft k, and therefore half coupling 2, in the direction of the screw surface of shaft 4. When rotating shaft k in the opposite direction, due to the magnetic coupling between the magnets 3 half coupling 1 and 2, half coupling 2 moves progressively along the shaft to the stop 6. In this case, the coupling half 2 does not rotate. When the coupling half 2 reaches the stop 6, it becomes rigidly engaged with the shaft 4, and from that moment its rotation begins with the shaft k. Its magnets 3 interact with the magnets 3 of the half-coupling 1, which begins to rotate synchronously with the coupling half 2. When changing the direction of rotation (reverse) of the shaft k of the coupling half 2 under the action of tangential magnetic forces, without rotating, begins to move from the stop 6 to the stop 5. When the half coupling 2 reaches the stop 5, it becomes rigidly coupled to the shaft, and with this moment begins its rotation together with the shaft 4. The rotation of the coupling half 2 causes synchronous rotation of the coupling half 1. Thus, by changing the direction of rotation of the driving element of the magnetic coupling, the mutual arrangement of the coupling half 1 and 2 of the magnetic coupling can be changed, and therefore, vtomaticheskogo varying the torque. Moving the stops 5 and 6 along the shaft k with respect to the magnets 3, it is possible to achieve certain values of the maximum and minimum values of the torque. Thus, as the thickness of the anvil 5 increases, the maximum moment transmitted by the clutch decreases, the removal of the anvil 6 from the half-coupling 1 reduces the maximum torque. The displacement of the movable coupling half 2 relative to the fixed coupling half 1 within the length of the magnets 3 provides a proportional change in torque with the adjustment range several times. With further removal of the stop 6, the moving coupling half 2 extends beyond the length of the magnets of the fixed coupling floor 1. In this mutual position, coupling half 1 and 2 clutch may be considered as some kind of end magnetic clutches. The transmitted moment in this region drops sharply, the proportionality of the moment is violated. However, the screwing in (returning) of the movable coupling half 2 is maintained until the maximum moment is less than the moment of friction of the moving coupling half 2 along the helical surface of the shaft k. In practice, the required adjustment range (ratios of the maximum moment to the minimum) is achieved by shifting the moving coupling half 2 within the length of the magnets 3 fixedly coupling half 1, since the required minimum drive torque is certainly greater than the moment of friction over the helical surface. The load on the coupling, exceeding the force of interaction of the magnets 3, leads to turning the coupling halves 1 and 2 relative to each other. The advantage of the proposed coupling as compared with the known ones is the possibility of automatically changing the transmitted torque depending on the direction of rotation. The invention can also be realized in faceplate couplings and with another type of screw joint of the shaft with a movable coupling half a finger, a screw groove, etc. Claims Magnetic coupling comprising a movable coupling half mounted on a shaft with the possibility of axial movement by means of screws and nuts interconnected, a fixed half coupling and permanent magnets mounted on the coupling half, characterized in that, in order to ensure an automatic change when reversing the value torque transmitted by the clutch, it is provided asymmetrically mounted on the shaft relative to the magnets of the fixed coupling half stops for the movable coupling half, and the latter is fixed to p zhennoy with a screw nut.