JP2011234535A - Torque transmission device and switch device using this - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost torque transmission device which can be restored to a torque transmission status after step-out and a switch device using this.SOLUTION: A driving side rotator 2 has permanent magnets 21 positioned with an equal interval between each other along the circumferential direction so that the polarities alternate each other. A follow-moving side rotator 1 has salients 11 positioned with an equal interval between each other along the circumferential direction so that they face against each of the permanent magnets 21. The salients 11 are surrounded by non-magnetic conductors 3. Since the non-magnetic conductors 3 surround the salients 11, according to the law of Lenz, an induction current is generated by the magnetic flux of the permanent magnets 21. Therefore, because of the effect of the magnetic field φ due to this induction current, a repulsion force and a suction force work between each of the magnets 21 and each of the salients 11 in order to prevent the driving side rotator 2 from slipping so that a torque is transmitted from the driving side rotator 2 to the follow-moving side rotator 1.

Description

  The present invention relates to a torque transmission device and a turning machine using the torque transmission device.

  The switch is to convert the Tongleil between the normal position and the reverse position, and includes a drive motor, an operating rod and a lock rod, a transmission mechanism for transmitting the driving force to the operating rod, and a lock rod. It has a lock piece to unlock. In a rolling machine, if the normal operation is obstructed, for example, when a foreign object is caught between the Tongleil and the basic rail, the drive motor locks and burns out, or each part is affected by an impact generated by a sudden stop. There was a risk of damage. As for the impact, there is a similar fear because the structure that absorbs the inertia by the contact with the stopper at the end of the normal operation is adopted. For this reason, a torque transmission device having a torque limiter is usually provided in the transmission mechanism of the turning machine.

  For example, a magnetic torque transmission device as disclosed in Patent Document 1 magnetically couples a driving system and a driven system, so that frictional heat and dust found in a transmission system using a friction plate can be obtained. There is no generation and wear of members, which is preferable.

  However, this torque transmission device does not naturally recover to the torque transmission state even if the load decreases to less than the maximum transmission torque after the load exceeds the maximum transmission torque and becomes out of step. . As described above, the torque transmission device that requires manual work for recovery is not suitable for use as a torque limiter of the turning machine scattered on the track.

  On the other hand, the torque transmission device disclosed in Patent Document 2 is said to be able to naturally recover to the torque transmission state after the step-out.

  However, this torque transmission device has a problem that it is costly because it is necessary to provide a plurality of permanent magnets along the circumferences of both the drive disk and the driven disk.

JP 2008-64205 A JP-A-5-168222

  An object of the present invention is to provide a low-cost torque transmission device that can naturally recover to a torque transmission state after a step-out and a turning machine using the same.

  In order to solve the above-described problem, a torque transmission device according to the present invention transmits torque from a drive-side rotator to a driven-side rotator, and the drive-side rotator has a polarity along a circumferential direction. Permanent magnets are arranged at intervals so as to alternate, and the driven-side rotating body is formed with projections at intervals along the circumferential direction so as to face each of the permanent magnets. .

  The convex portion is surrounded by a nonmagnetic conductor.

According to the torque transmission device according to the present invention, the permanent magnets alternately arranged in the circumferential direction of the drive-side rotator are opposed to the convex portions disposed in the circumferential direction of the driven-side rotator. Therefore, during normal operation, the convex part of the driven rotor serves as a yoke (so-called yoke) due to the magnetic flux of the permanent magnet of the driving rotor, so that the permanent magnet and the convex attract each other and rotate on the drive side. Torque is transmitted from the body to the driven rotating body.

  In addition, since the nonmagnetic conductor surrounds the periphery of the convex portion, an induced current is generated in the nonmagnetic conductor by the magnetic flux of the permanent magnet according to Lenz's law at the time of starting. Therefore, a repulsive force and an attractive force are generated between each magnet and each convex portion due to the action of the magnetic field due to the induced current, preventing the drive-side rotator from slipping, and the drive-side rotator to the driven-side rotator. Torque is transmitted.

  Therefore, even when a torque larger than a predetermined load is applied and the driving side rotating body reaches a step-out state, if the torque becomes smaller than the predetermined load, the permanent magnet and the convex portion are magnetically separated according to the above operating principle. To the torque transmission state from the step-out state.

  Furthermore, since the permanent magnet is arrange | positioned only at the drive side rotary body, the torque transmission apparatus which concerns on this invention can reduce material cost.

  Here, it is preferable that the non-magnetic conductor integrally surrounds two or more convex portions arranged in succession. This is because the number of parts can be reduced, assembly can be simplified, and production efficiency can be improved as compared with the case where a nonmagnetic conductor is individually attached to each convex portion. .

  Next, the turning machine according to the present invention includes an operating rod, a driving source that drives the operating rod, and a speed reduction mechanism that decelerates the driving force of the driving source and transmits the driving force to the operating rod. The speed reduction mechanism includes a plurality of speed reduction units, and the torque transmission device according to the present invention is disposed between the plurality of speed reduction units.

  Since the turning machine according to the present invention includes the torque transmission device according to the present invention, the same effect as described above can be obtained. In other words, the tipping machine according to the present invention can naturally restore the torque transmission device from the step-out state to the torque transmission state without requiring manpower.

  Further, the turning machine according to the present invention is only one embodiment of the torque transmission device according to the present invention, and can be applied to, for example, a driving device for a breaker trunk of a breaker, as well as a lifting device, The present invention can be widely applied to apparatuses such as a conveyor and a shredder.

  As described above, according to the present invention, it is possible to provide a low-cost torque transmission device that can naturally recover to a torque transmission state after a step-out, and a turning machine using the torque transmission device. .

It is a fragmentary sectional view of the upper surface of the torque transmission device concerning the present invention. It is a fragmentary sectional view of the side of the torque transmission device according to the present invention. The magnetic coupling state at the time of torque transmission seen from the upper surface of the torque transmission device is shown. The action state of the magnetic force at the time of torque restoration seen from the upper surface of the torque transmission device is shown. It is an expanded view of the internal peripheral surface of a driven side rotary body. It is a fragmentary sectional view of the upper surface of the torque transmission device concerning other embodiments. It is a fragmentary sectional view of the side of the torque transmission device concerning other embodiments. It is an expanded view of the internal peripheral surface of the driven side rotary body which concerns on other embodiment. It is a fragmentary sectional view of the upper surface of the torque transmission device concerning other embodiments. It is a fragmentary sectional view of the side of the torque transmission device concerning other embodiments. It is a figure which shows the switch machine concerning this invention longitudinally. It is a figure which shows a torque limiter longitudinally.

  1 and 2 are partial cross-sectional views of the upper surface and side surfaces of the torque transmission device according to the present invention, respectively. The torque transmission device transmits torque from the driving side rotating body 2 to the driven side rotating body 1.

  The drive-side rotator 2 has a columnar shape, and the driven-side rotator 1 has a cylindrical shape whose inner peripheral surface faces the outer peripheral surface of the drive-side rotator 2. The driven-side rotator 1 and the drive-side rotator 2 are concentrically arranged, and are respectively centered on the rotation shafts 4 and 5 extending vertically in the plane of FIG. 2 so as to be rotatable. Has been. Here, the rotating shaft 5 of the driving side rotating body 2 is provided on the end surface of the driving side rotating body 2 through the opening 12 of the driven side rotating body 1. However, the driven-side rotator 1 and the drive-side rotator 2 are not limited to such shapes, but may be other shapes such as a hollow / solid shape of a regular hexagonal prism.

  In the drive-side rotating body 2, permanent magnets 21 are arranged at intervals along the circumferential direction so that the polarities are alternated. That is, on the outer peripheral surface of the drive-side rotator 2, magnets whose surfaces are magnetized to N poles and permanent magnets 21 which are magnetized to S poles are alternately arranged at equal intervals. The shape of the magnet 21 is not limited to a square shape as shown in the figure, and may be other shapes such as a circular shape.

  On the other hand, the driven-side rotator 1 is made of iron having a high magnetic permeability, and the convex portions 11 are formed at intervals along the circumferential direction so as to face each of the permanent magnets 21. That is, the convex portions 11 are arranged at equal intervals on the inner peripheral surface of the driven-side rotator 1. The convex portion 11 is made of a soft magnetic material.

  As shown in the drawing, the convex portion 11 is desirably integrally formed with the driven-side rotator 1 in order to allow the magnetic flux to pass through suitably, but may be formed separately and attached to the driven-side rotator 1. Moreover, the shape of the convex part 11 is not limited to the square shape as shown in figure, Other shapes, such as circular shape, may be sufficient.

  With this configuration, a magnetic coupling state during torque transmission as shown in FIG. 3 is obtained. In normal operation, when the drive-side rotator 2 rotates in the r direction, the convex portion 11 functions as a yoke (junction) so that it enters the convex portion 11 from the N-pole magnet 21 and is adjacent to the convex portion. A magnetic flux φ exiting 11 and entering the south pole magnet is generated. For this reason, the driven side rotating body 1 and the driving side rotating body 2 are magnetically coupled, and the driven side rotating body 1 rotates in the r direction in accordance with the rotation of the driving side rotating body 2.

  However, when the rotational torque of the drive side rotator 2 exceeds the magnetic attractive force acting between the drive side rotator 2 and the driven side rotator 1, the magnetic coupling is broken and the torque transmission device is in a step-out state. (Slip state). Once the step-out state is reached, the torque in the forward and reverse directions acts alternately between the driven-side rotator 1 and the drive-side rotator 2, so the average transmission torque is about 0. Torque cannot be transmitted.

  Therefore, as a characteristic part of the present invention, the nonmagnetic conductor 3 is provided so as to surround the periphery of the convex portion 11. The nonmagnetic conductor 3 is a short-circuited ring made of metal such as a copper coil, and is individually wound around the outer periphery of each convex portion 11.

According to this configuration, when the driven-side rotator 1 and the drive-side rotator 2 rotate asynchronously, or when only the driven-side rotator 1 is stopped, the nonmagnetic conductor 3 is guided according to Lenz's law. A current is generated, and as a result, the convex portion 11 functions as an N-pole or S-pole magnet.

  FIG. 4 shows the action state of the magnetic force seen from the top surface of the torque transmission device at this time, and FIG. 5 is a development view of the inner peripheral surface of the driven-side rotator 1. Here, the direction of the induced current is as shown by the symbol of the nonmagnetic conductor 3 in FIG. 4 or the arrow in FIG. For this reason, the convex part 11 in the position where the S-pole magnet 21 approaches and the N-pole magnet 21 moves away becomes the S-pole, while the N-pole magnet 21 approaches and the S-pole magnet 21 moves away. A certain convex part 11 becomes an N pole.

  Therefore, after the step-out, a repulsive force (see the double arrow in FIG. 3) and an attractive force (see the single arrow in FIG. 3) act between each magnet 21 and each convex portion 11, respectively. Therefore, the driven-side rotator 1 is dragged by the rotation of the drive-side rotator 2, and eventually rotates synchronously. As a result, the driven-side rotator 1 and the drive-side rotator 2 are again magnetically Can be combined.

  As shown in FIGS. 4 and 5, the induced current is in the same direction on the sides of the adjacent coils of the pair of nonmagnetic conductors 3. Therefore, the nonmagnetic conductor 3 is not limited to a coil that is individually wound around each convex portion 11 as in the present embodiment, but is a sheet-like non-circular surrounding two or more convex portions 11 that are continuously arranged. It may be a magnetic conductor.

  6 to 8 are a top view, a side view, and a development view of the inner peripheral surface of the driven-side rotating body 1, respectively, of the torque transmission device according to the embodiment employing a sheet-like nonmagnetic conductor. Thus, if the nonmagnetic conductor 6 surrounds each convex part 11 integrally, compared with the case where the nonmagnetic conductor 3 is separately attached to each convex part 11, the number of parts can be reduced. In addition, assembly can be simplified and production efficiency can be improved.

  In the above-described embodiment, the configuration in which the driving side rotating body 2 and the driven side rotating body 1 are arranged on the inner side of the two rotating bodies 1 and 2 is shown. Also good.

  FIGS. 9 and 10 respectively show the top and side surfaces of the torque transmission device according to the embodiment in which the sheet-like nonmagnetic conductor 6 is employed, the driving side rotator 2 is disposed outside, and the driven side rotator 1 is disposed inside. It is a fragmentary sectional view. In this embodiment, it is needless to say that the same effect as that of the above-described embodiment can be obtained. However, which one of the arrangement configurations of the rotating bodies 1 and 2 is appropriately selected based on the application form of the torque transmission device. Should be determined.

  As described so far, according to the torque transmission device according to the present invention, the permanent magnets 21 whose polarities are alternately arranged in the circumferential direction of the driving side rotating body 2 are arranged in the circumferential direction of the driven side rotating body 1. It faces the convex portion 11 made. Therefore, during normal operation, the convex portion 11 of the driven-side rotating body 1 serves as a yoke (yoke) due to the magnetic flux φ of the permanent magnet 21 of the driving-side rotating body 2, so that the permanent magnet 21 and the convex portion 11 attract each other. Accordingly, torque is transmitted from the driving side rotating body 2 to the driven side rotating body 1.

  In addition, since the nonmagnetic conductor 3 surrounds the convex portion 11, an induced current is generated in the nonmagnetic conductor 3 by the magnetic flux of the permanent magnet 21 in accordance with Lenz's law at the time of starting. Therefore, a repulsive force and an attractive force act between each magnet 21 and each convex portion 11 due to the action of the magnetic field due to this induced current, preventing the drive-side rotator 2 from slipping, and the drive-side rotator 2 to the driven side. Torque is transmitted to the rotating body 1.

  Therefore, even when a torque larger than a predetermined load is applied and the driving side rotating body 2 reaches a step-out state, if the torque becomes smaller than the predetermined load, the permanent magnet 21 and the convex portion 11 are similarly magnetically coupled. To the torque transmission state from the step-out state.

  Furthermore, since the permanent magnet 21 is arrange | positioned only at the drive side rotary body 2, the torque transmission apparatus which concerns on this invention can reduce material cost.

  Next, a tipping machine according to the present invention will be described. FIG. 11 is a longitudinal sectional view of the turning machine according to the present embodiment.

  The turning machine has a drive motor 90. The drive motor 90 is a drive source and is attached to the case 92 of the tipping machine. In the case 92, an operation rod 97, a lock rod 99, a lock piece 98, a speed reduction mechanism 94, a torque limiter 8 and the like are provided.

  The operating rod 97 is for moving a tongleil (not shown) between a normal position and an inverted position, and is a substantially rod-shaped member extending in the front and back direction of the paper surface of FIG. Similarly to the operation rod 97, the lock rod 99 is a substantially rod-shaped member extending in the front and back direction of FIG. 11 and is connected in the vicinity of the tip of the tongrel and detects the position in the vicinity of the tip of the tongrel. The lock piece 98 engages and disengages from the notch provided in the lock rod 99 according to a predetermined condition, and locks and unlocks the lock rod 99. The operation rod 97, the lock rod 99, and the lock piece 98 can be configured in the same manner as the configuration provided in the existing turning machine.

  The speed reduction mechanism 94 decelerates the driving force of the driving motor 90 and transmits it to the operating rod 97. The reduction mechanism 94 has a plurality of stages, in this example, a three-stage reduction part. The first stage reduction part is composed of the first gear 91 and the second gear 80, the second stage reduction part is comprised of the third gear 82 and the fourth gear 95, and the third stage reduction part is The fifth gear 93 and the sixth gear 96 are included. The first gear 91 and the second gear 80 are a small bevel gear and a large bevel gear, respectively. The fourth gear 82 and the fifth gear 93 are supported by the same shaft member so as to rotate integrally. On the other hand, the torque limiter 8 is provided between the second gear 80 and the third gear 82, that is, the second gear 80 and the third gear 82 are supported by different shaft members.

  FIG. 12 shows the torque limiter 8 in a longitudinal section. The torque limiter 8 includes the torque transmission device shown in FIG. 9 and FIG. 10, and further includes a second gear 80, which is a large bevel gear, on the outer peripheral surface of the drive-side rotator 2. A third gear 82 is provided.

  Thus, since the switch machine which concerns on this invention includes the torque transmission apparatus which concerns on this invention in a structure, there exists an effect similar to the content mentioned above. In other words, the tipping machine according to the present invention can naturally restore the torque transmission device from the step-out state to the torque transmission state without requiring manpower.

  Moreover, the switch according to the present invention has the following effects. First of all, in a turning machine, there is a possibility that the drive motor may be locked and burnt out at the end of normal operation or when operation is interrupted, or each part may be damaged by an impact generated by a sudden stop. In this regard, in the turning machine according to the present embodiment, the torque limiter 8 is incorporated in the speed reduction mechanism 94. Therefore, during normal operation, the torque limiter 8 does not impede the function of the speed reduction mechanism 94, and the output of the drive motor 90 is transmitted to the speed reduction mechanism 94, and the operation rod 97 is driven to realize the conversion operation. On the other hand, at the end of normal operation or when disturbing the operation, an excessive torque transmission state is not generated, and the operation parts including the drive motor 90, the speed reduction mechanism 94, the operation rod 97 and the lock rod 99 are protected. Can be achieved.

The above-described turning machine is merely an embodiment of the torque transmission device according to the present invention, and can be applied to, for example, a driving device for a breaker trunk of a breaker. And can be widely applied to devices such as a shredder.

  Although the contents of the present invention have been specifically described above with reference to the preferred embodiments, it is obvious that those skilled in the art can take various modifications based on the basic technical idea and teachings of the present invention. It is.

DESCRIPTION OF SYMBOLS 1 Driven side rotary body 11 Convex part 2 Drive side rotary body 21 Permanent magnet 3,6 Nonmagnetic conductor 90 Drive motor 94 Deceleration mechanism 97 Operating rod

Claims (4)

A torque transmission device for transmitting torque from a driving side rotating body to a driven side rotating body,
The drive-side rotator has permanent magnets arranged at intervals so that the polarities are alternated along the circumferential direction,
The driven-side rotating body is formed with convex portions made of a soft magnetic material at intervals along the circumferential direction so as to face each of the permanent magnets.
The convex portion is surrounded by a nonmagnetic conductor. The torque transmission device according to claim 1,
The nonmagnetic conductor integrally surrounds the two or more convex portions arranged in succession. The torque transmission device according to claim 1 or 2,
One of the driving-side rotator and the driven-side rotator has a columnar shape, and the other has a cylindrical shape whose inner peripheral surface faces the outer peripheral surface of the driving-side rotator. Operation 桿,
A drive source for driving the operating rod;
A tipping machine comprising a speed reduction mechanism for decelerating and transmitting the driving force of the driving source to the operating rod,
The deceleration mechanism has a plurality of stages of deceleration units,
The torque transmission device according to any one of claims 1 to 3 is disposed between the plurality of speed reduction units.

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