JP5327966B2 - Magnetic coupling device - Google Patents

Description

  The present invention relates to a magnetic coupling device.

  2. Description of the Related Art Conventionally, there is a torque transmission device that varies the amount of magnetic flux by moving a permanent magnet to make the torque variable (see, for example, Patent Document 1).

  However, a magnetic coupling device with adjustable acceleration / deceleration that can adjust acceleration and deceleration at the time of rising and stopping of the output shaft has not been put into practical use.

JP 2004-52950 A

  An object of the present invention is to provide a magnetic coupling device that can perform constant acceleration and deceleration operation based on a constant speed operation and a predetermined magnetic transmission torque value.

According to the present invention, a drive magnet and a driven magnet that are magnetically coupled between a drive input shaft and a driven output shaft at a predetermined rotational speed are arranged coaxially opposite to each other via a gap, and either the drive magnet or the driven magnet is used. A magnetic coupling device in which the screw can be fed in the axial direction and the magnetic transmission torque value is variable, and the driven output shaft performs a constant acceleration / deceleration operation according to the magnetic transmission torque value and a constant speed operation according to the rotational speed of the drive input shaft. The magnetic transmission torque value between the drive magnet and the driven magnet is made smaller than the rotational torque of the drive input shaft, and is slidably engaged with a male screw portion fixed to either the driven output shaft or the drive input shaft. The screw feed slider that is rotatably engaged with the female screw portion screwed into the male screw portion is provided in either the drive magnet or the driven magnet.

  The screw feed slider is composed of a pin engaged with an annular groove formed in the female screw portion and a square portion engaged with a slit formed in the male screw portion, or the driving magnet and the driven magnet are alternately different. It is preferable that it is made of a large number of magnet pieces on which poles are arranged.

According to the present invention, a drive magnet and a driven magnet that are magnetically coupled between a drive input shaft and a driven output shaft at a predetermined rotational speed are arranged coaxially opposite to each other via a gap, and either the drive magnet or the driven magnet is used. A magnetic coupling device in which the screw can be fed in the axial direction and the magnetic transmission torque value is variable, and the driven output shaft performs a constant acceleration / deceleration operation according to the magnetic transmission torque value and a constant speed operation according to the rotational speed of the drive input shaft. The magnetic transmission torque value between the drive magnet and the driven magnet is made smaller than the rotational torque of the drive input shaft, and is slidably engaged with a male screw portion fixed to either the driven output shaft or the drive input shaft. by providing a screw feed slider which rotatably engaged with respect to the female screw portion to be screwed to the external thread portion to one of the drive magnet and driven magnet, the drive magnet and the driven magnet Since increasing or decreasing the area of overlap with can change acceleration characteristics of the driven output shaft, it becomes highly versatile Unusual be applied to various use conditions. In addition, since the acceleration / deceleration characteristics can be changed without performing motor control by an inverter, the apparatus can be made inexpensive. In addition, when sudden braking is applied, the driving magnet and the driven magnet slip, so that an overload on the motor can be prevented. Furthermore, the motor connected to the driven output shaft does not need to be specially ordered according to the conditions of use and can be assembled with a large-capacity standard product, so that the manufacturing cost can be reduced and a large torque can be produced. It can handle everything from what you need to small torque.

  Further, as in claim 2, the screw feed slider is composed of a pin engaged with an annular groove formed in the female screw portion and a square portion engaged with a slit formed in the male screw portion. It is possible to smoothly and easily slide the drive magnet or driven magnet to be screwed in the axial direction. Furthermore, as described in claim 3, the acceleration / deceleration characteristics and the maximum torque to be received can be set finely by making the drive magnet and the driven magnet comprise a large number of magnet pieces in which different polarities are alternately arranged.

It is sectional drawing which shows embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1. It is BB sectional drawing of FIG. 1 similarly. It is the schematic which shows the arrangement pattern of a drive magnet and a driven magnet. It is a side view which shows the state integrated in the roller conveyor apparatus. It is a velocity diagram which shows the change of the acceleration / deceleration characteristic at the time of changing a magnetic transmission torque value.

Next, an embodiment of the device of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 1 is a magnetic coupling device, and the magnetic coupling 1 comprises a motor 3 with a speed reducer attached to a cylindrical main body 2 and a driven output shaft 4 protruding from the cylindrical main body 2. The cylindrical main body 2 is provided with a drive magnet 5 connected to the drive input shaft 3a of the motor 3 with speed reducer and a driven magnet 6 attached to the driven output shaft 4. The drive magnet 5 and the driven magnet 6 are coaxially opposed to each other, and the drive magnet 5 can be screwed in the axial direction with respect to the driven magnet 6.

  As shown in FIGS. 3 and 4, the drive magnet 5 has a large number of magnet pieces 5 a alternately arranged with different poles attached to an annular ring 50. As shown in FIGS. 3 and 4, the driven magnet 6 has a large number of magnet pieces 6 a alternately arranged with different poles attached to an annular ring 60. The magnet piece 5a of the drive magnet 5 and the magnet piece 6a of the driven magnet 6 are magnetically attracted with their opposite poles facing each other and are magnetically linked, and the magnetic transmission torque value is variable.

  Moreover, since the magnetic transmission torque value when the driving magnet 5 and the driven magnet 6 have the maximum magnetic force arranged at the same position is smaller than the rotational torque of the motor 3 with a reduction gear (drive input shaft 3a), the deceleration When a large torque is applied when the motor-equipped motor 3 is started or stopped, the driving magnet 5 and the driven magnet 6 can slip and allow excessive torque to escape. The rotational speed of the drive input shaft 3a is based on the rotational speed of the motor 3 with a speed reducer and can be freely changed.

  The input shaft 3 a of the motor 3 with speed reducer is fixed to the male screw portion 9, and the male screw portion 9 is screwed into the female screw portion 8. As shown in FIGS. 1 and 3, the drive magnet 5 is attached to the female screw portion 8 and the male screw portion 9 via four screw feed sliders 10. The screw feed slider 10 has a rectangular portion 10a whose side surface is engaged with the slit 9a of the male screw portion 9, and a pin 10b that is slidably fitted in an annular groove 8a formed on the inner peripheral surface of the tip of the female screw portion 8. Consists of.

  Further, the male screw portion 9 has a cup shape with an open end, and as shown in FIGS. 1 and 3, the slits 9a are formed at intervals of 90 ° from the end opening to the vicinity of the intermediate portion, so that four screw feed sliders are formed. 10 can be slide-guided in the axial direction.

  For this reason, as shown in FIG. 2, an operation lever (not shown) is inserted into a lever insertion hole 12 formed at an interval of 45 ° on the outer periphery of the female screw portion 8, and the female screw portion 8 is inserted into the male screw portion 9 by the operation lever. If the counterclockwise rotation is performed, the female screw portion 8 is loosened with respect to the male screw portion 9, that is, comes out of the male screw portion 9. For this reason, the overlapping area of the drive magnet 5 and the driven magnet 6 decreases, and the magnetic transmission torque value acting between them decreases.

  Further, if the female screw part 8 that has come out of the male screw part 9 is rotated clockwise by the operation lever, the female screw part 8 is screwed into the male screw part 9, and the amount of overlap between the drive magnet 5 and the driven magnet 6 increases. When the female thread portion 8 abuts on a bearing 17 to be described later, the overlapping area of the drive magnet 5 and the driven magnet 6 is maximized, and the magnetic transmission torque value is maximized.

  As shown in FIG. 2, reference numeral 13 denotes a set screw that prevents the male screw portion 9 and the female screw portion 8 from rotating. .

  Reference numeral 15 denotes a chain sprocket attached to the output shaft 4, and 16 denotes left and right bearings that support both ends of the driven output shaft 4. The driven magnet 6 is disposed on the shaft core by the bearing 16. Reference numeral 17 denotes left and right bearings that support the both ends of the male screw portion 9 in a stretched manner, and the drive magnet 5 is disposed on the shaft core by the bearing 17.

  Reference numeral 18 denotes an oil seal, and 19 denotes a shielding lid that is covered by a notch 20 formed in the cylindrical body 2. An operation lever is provided in the lever insertion hole 12 of the female screw portion 8 that is exposed by opening the shielding lid 19. By swinging the insertion operation lever, the internal thread portion 8 is tightened or loosened with respect to the external thread portion 9, and the amount of overlap of the drive magnet 5 with respect to the driven magnet 6 is increased or decreased to increase or decrease the magnetic attractive force. As shown in FIG. 5, the torque and acceleration / deceleration of the driven output shaft 4 that performs output are adjusted. 21 is a fish. Reference numeral 50 denotes an annular ring 50 to which the drive magnet 5 is attached, and 60 denotes an annular ring to which the driven magnet 6 is attached.

  As shown in FIG. 5, such a magnetic coupling device 1 is assembled to a roller conveyor device, and a chain is wound around the chain sprocket of the roller conveyor and the chain sprocket 15 of the driven output shaft 4. Next, the magnetic transmission torque value is adjusted according to the weight of the conveyed product and the conveying speed.

  In this adjustment, after removing the shielding lid 19 and opening the notch 20, the operator inserts an operation lever (not shown) into the lever insertion hole 12 of the female screw portion 8 exposed on the outer peripheral surface of the female screw portion 8. Then, the female screw portion 8 is rotated.

  By this operation, the internal thread portion 8 moves to the left in FIG. 1 and deviates from the state of being exactly overlapped with the external thread portion 9, and the overlap length is reduced. Decreases and the magnetic transmission torque value decreases, and the difference from the rotational torque of the motor 3 with a speed reducer (input shaft 3a) increases. Therefore, the acceleration / deceleration is suppressed, and the torque transmitted to the driven output shaft 4 Also decreases. Further, if the reverse operation is performed, the difference between the rotational torque of the drive input shaft 3a and the magnetic transmission torque value by the drive magnet 5 and the driven magnet 6 is reduced, so that the acceleration / deceleration can be increased. Furthermore, the conveyance speed of the roller conveyor is determined by the rotation speed of the motor 3 with a speed reducer, and a constant speed operation is performed.

  In the embodiment, the internal threaded portion 8 is manually operated. However, if the internal threaded portion 8 is operated by being rotated by a motor that can rotate forward and backward, acceleration and deceleration, or a roller conveyor. Can be controlled during operation.

DESCRIPTION OF SYMBOLS 1 Magnetic coupling apparatus 2 Cylindrical main body 3 Motor with reduction gear
3a Drive input shaft 4 Driven output shaft 5 Drive magnet
5a Magnet piece 6 Driven magnet
6a Magnet piece 8 Female thread
8a Annular groove 9 Male thread
9a slit
10 Screw feed slider
10a Square part
10b pin
12 Lever insertion hole
13 Set screw
15 Chain sprocket
16 Bearing
17 Bearing
18 Oil seal
19 Shield lid
20 Notches
21 Bush
50 annular ring
60 annular ring

Claims (3)

A drive magnet and a driven magnet that are magnetically connected between a drive input shaft and a driven output shaft at a predetermined rotational speed are arranged coaxially opposite each other via a gap, and either the drive magnet or the driven magnet is arranged in the axial direction. A magnetic coupling device, wherein a magnetic transmission torque value is variable so as to be screw feedable, and the driven output shaft performs a constant acceleration / deceleration operation according to the magnetic transmission torque value and a constant speed operation according to the rotational speed of the drive input shaft, The magnetic transmission torque value between the drive magnet and the driven magnet is made smaller than the rotational torque of the drive input shaft, and the male screw portion is slidably engaged with a male screw portion fixed to either the driven output shaft or the drive input shaft. A magnetic coupling device characterized in that a screw feed slider that is rotatably engaged with a female screw portion that is screwed into the drive magnet is provided in either the drive magnet or the driven magnet.   2. The magnetic coupling device according to claim 1, wherein the screw feed slider comprises a pin engaged with an annular groove formed in the female screw portion and a square portion engaged with a slit formed in the male screw portion. .   3. The magnetic coupling device according to claim 1, wherein the driving magnet and the driven magnet are composed of a large number of magnet pieces in which different poles are alternately arranged.

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