JP2006329390A - Magnetic coupling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic coupling device for eliminating the need for highly accurate machining/assembly of a driving side rotor and a driven side rotor while solving problems with backlash, noises or tooth wear due to tooth-meshing of the driving side rotor with the driven side rotor. <P>SOLUTION: To a driving side gear 6 as the driving side rotor and a driven side gear 8 as the driven side rotor, respectively, magnetic coupling members 9, 10 are attached on the circumferences of which N, S alternate magnetic poles are formed. The magnetic coupling member 9 on the driving side is rotated by the driving side gear 6 to generate magnetic force between the magnetic coupling member 10 on the driven side and itself and transmit it to the driven side gear 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a magnetic coupling device that transmits rotation using magnetic force.

  Rotational transmission mechanisms using gears and timing belts with teeth are due to the meshing of the teeth, so there are problems such as backlash, noise and tooth wear. The demand for is high.

Examples of magnetic coupling devices that transmit rotation using magnetic force include, for example, Patent Document 1 (Japanese Patent No. 3463700), Patent Document 2 (Japanese Patent Laid-Open No. 11-31260), and Patent Document 3 (Japanese Patent Laid-Open No. 2000-83365). However, there is no one that combines a magnetic coupling device with a gear or a timing belt to perform complex rotation transmission.
Japanese Patent No. 3463700 Japanese Patent Laid-Open No. 11-311260 JP 2000-83365 A

  An object of the present invention is to solve the above-mentioned problems caused by a rotation transmission mechanism using a gear having a tooth or a timing belt by using a magnetic coupling device together.

  In the magnetic coupling device of the present invention, a magnetic coupling member in which N and S alternating magnetic poles are formed on the circumference is attached to each of the rotating body on the driving side and the driven side having teeth. By rotating the drive-side magnetic coupling member, a torque due to magnetic force is generated between the driven-side magnetic coupling member and the torque is transmitted to the driven-side rotating body.

  From the viewpoint of compactness, it is preferable that a ring-shaped magnetic coupling member is attached to the side surface of the rotating body on each of the driving side and the driven side, and the peripheral surfaces of both magnetic coupling members are opposed to each other.

  If the diameters of the driving-side rotator and the magnetic coupling member are different from the diameters of the driven-side rotator and the magnetic coupling member, a speed reduction or speed increasing mechanism is obtained.

  When the drive-side rotator and the driven-side rotator are the drive-side gear and the driven-side gear and these teeth mesh with each other, they are usually combined so that the teeth are not in contact with each other. It is desirable that the teeth contact each other when a torque greater than the torque due to the magnetic force between the coupling member and the driven magnetic coupling member is applied.

  When the driving side rotating body and the driven side rotating body are a driving side pulley and a driven side pulley to which rotation is transmitted via a timing belt, a driving side magnetic coupling member attached to the driving side pulley; An intermediate magnetic coupling member is interposed between the driven-side magnetic coupling member attached to the driven-side pulley, and torque due to magnetic force is transmitted to the driven-side magnetic coupling member via this magnetic coupling member. So that

  The magnetic coupling device of the present invention can be applied to an electric rotary actuator, in which case, the drive-side rotator is rotated by a motor, and the driven-side rotator is driven to rotate with the rotor. Side and driven side magnetic coupling members are incorporated into the electric rotary actuator. When a timing belt is used, an intermediate magnetic coupling member is also incorporated into the electric rotary actuator.

  The magnetic coupling device of the present invention can also be applied to an electric slider. In this case, the driving side rotating body is rotated by a motor, and the driven side rotating body rotates a screw shaft on which the slider slides. As described above, the rotating body and the magnetic coupling members on the driving side and the driven side are incorporated in the electric slider. When a timing belt is used, an intermediate magnetic coupling member is also incorporated into the electric slider.

  In the magnetic coupling device of the present invention, a magnetic coupling member is attached to each of the driving side rotating body and the driven side rotating body having teeth, and the rotation of the driving side rotating body is rotated using the torque generated by magnetic force. Therefore, it is possible to eliminate problems such as backlash, noise and tooth wear caused by the meshing of the teeth of the drive side driven body and the driven side rotary body, and high processing and assembly for the drive side rotary body and the driven side rotary body. No need for accuracy.

  If the ring-shaped magnetic coupling member is attached to the side surfaces of the rotating bodies on the driving side and the driven side as in the invention according to claim 2, and the peripheral surfaces of both magnetic coupling members are opposed to each other, It can be made compact.

  If the relationship between the diameters of the driving-side rotating body and the magnetic coupling member and the diameters of the driven-side rotating body and the magnetic coupling member is different as in the invention according to claim 3, the above-described effects can be obtained. It has a deceleration or speed increasing mechanism.

  As in the invention according to claim 4, the drive side gear and the driven side gear are usually combined so that the teeth are not in contact with each other, and the drive side magnetic coupling member and the driven side magnetic coupling are combined. When a torque equal to or greater than the torque generated by the magnetic force between the members is applied, the effects described above are further enhanced if the teeth of each other come into contact with each other.

  When the rotation of the driving pulley is transmitted to the driven pulley via the timing belt as in the invention according to claim 5, the above effect is obtained by interposing an intermediate magnetic coupling member. This can be easily handled as a rotation transmission mechanism.

  As in the inventions according to claims 6 and 7, the magnetic coupling device of the present invention is an electric rotary actuator that decelerates or increases the rotation of the motor and transmits it to the rotor, or claims 8 and 9. Like the invention which concerns, it is suitable for applying to the electric slider which decelerates or accelerates rotation of a motor, transmits it to a screw shaft, and slides a slider.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  In Embodiment 1 shown in FIGS. 1 to 8, the present invention is applied to an electric rotary actuator capable of step rotation with a fine rotation angle. A magnetic coupling device A1 according to the present invention is incorporated in a box-shaped main body housing 1 of an electric rotary actuator together with a hypoid gear device 2, and a stepping motor (hereinafter simply referred to as a motor) 3 installed in the main body housing 1. The step rotation is decelerated by the magnetic coupling device A1 and transmitted to the cylindrical rotor 4 having the upper end facing the upper surface of the main body housing 1 via the hypoid gear device 2 so that the rotation is extracted to the outside. It has become.

  The motor 3 and the hypoid gear device 2 are juxtaposed in the main body housing 1, and the magnetic coupling device A 1 includes a drive side gear 6 fixed to the tip of the motor shaft 5 of the motor 3 and a pinion gear shaft 7 of the hypoid gear device 2. Rotation is transmitted to and from the driven gear 8 fixed to the base end portion with the following structure.

  That is, the drive side gear 6 and the driven side gear 8 are attached to the former side surface in addition to the teeth meshing with each other so that the former torque can be mechanically transmitted directly to the latter. The drive-side magnetic coupling member 9 and the driven-side magnetic coupling member 10 attached to the side surface of the latter can transmit the former torque to the latter using magnetic force.

  Both the driving side and driven side magnetic coupling members 9 and 10 are ring-shaped, and as shown in FIG. 9, they are so-called magnetic rings in which N and S alternating magnetic poles are formed on the circumference. The N-pole and the latter S-pole, and the former S-pole and the latter N-pole are alternately opposed to each other, and the circumferential magnetic force acts, so that the torque of the driving-side magnetic coupling member 9 is driven-side magnetic coupling. It is transmitted to the member 10 without contact.

  Since this torque has a sine waveform, the period and the meshing between the drive side gear 6 and the driven side gear 8 are as shown in FIGS. It is preferable that the torque becomes zero when the teeth of both gears 6 and 8 are completely meshed with each other at an integral multiple of the tooth pitch.

  Furthermore, as shown in FIG. 12, the drive side gear 6 and the driven side gear 8 are normally combined so that their teeth are not in contact with each other. Normally, in this state, the drive side magnetic coupling is combined. When the rotation is transmitted only by the torque generated by the magnetic force between the member 9 and the driven-side magnetic coupling member 10, and the torque exceeding the magnetic force is applied, the teeth of both gears 6 and 8 are mutually connected as shown in FIG. It is desirable to make contact so that the torque of the driving gear 6 is mechanically transmitted to the driven gear 8.

  FIG. 14 shows the relationship between the rotational angle-torque characteristics of the magnetic coupling by the driving-side magnetic coupling member 9 and the driven-side magnetic coupling member 10 and the rotational angle-torque characteristics of the stepping motor 3. The sine waveform (1) is the rotation angle-torque characteristic curve of the magnetic coupling when the magnetic coupling members 9 and 10 have 18 magnetic poles, and the sine waveforms (2) and (3) are the two-phase, 50-tooth In the rotation angle-torque characteristic curve of the stepping motor 3, the phase difference between the rotation angle-torque characteristic curve of the magnetic coupling occurs when the torque of the stepping motor 3 increases as shown by the sine waveform (3). The magnetic coupling action becomes unstable.

  As shown in FIGS. 6 and 8, the pinion gear shaft 7 of the hypoid gear device 2 is supported by the proximal end bearing 11 and the distal end side bearing 12 on the proximal end side and the distal end side. The proximal end bearing 11 is fixed to the inner peripheral surface of the hollow portion 13 in the main body housing 1 by a fixing ring 14, whereas the distal end side bearing 12 is directly fixed to the inner peripheral surface of the hollow portion 13. ing. The base end 7a of the pinion gear shaft 7 protrudes from the side surface of the main body housing 1, and the pinion gear shaft 7 can be manually rotated from the outside of the main body housing 1 with a tool such as a driver.

The tip of the truncated cone shape of the pinion gear shaft 7 is a hypoid pinion gear 15.
On the other hand, a hypoid ring gear 16 is attached to the lower surface of the flange 4 a provided in the intermediate part of the rotor 4, and meshes with the hypoid pinion gear 15 in the main body housing 1.

  The rotor 4 is supported by the upper and lower bearings 17 and 18 in the main body housing 1 so that the axial direction is orthogonal to the pinion gear shaft 7.

  According to such an electric rotary actuator, the rotation of the motor 3 causes torque to be transmitted between the driving side magnetic coupling member 9 and the driven side magnetic coupling member 10 in a non-contact state by magnetic force. Backlash between the gear 6 and the driven gear 8 is prevented, and noise and tooth wear due to contact between the teeth are also prevented.

  Then, the rotation is transmitted to the pinion gear shaft 7 which is a horizontal axis, and the hypoid pinion gear 15 at the tip thereof is engaged with the hypoid ring gear 16, so that it is supported by the upper and lower bearings 17 and 18 like the vertical axis. The existing rotor 4 rotates.

  The second embodiment shown in FIGS. 15 to 20 is an application of the present invention to an electric slider capable of fine step sliding. A magnetic coupling device A2 according to the present invention is incorporated in a box-shaped main body housing 21 of an electric slider together with a propulsion device 22 and a stepping motor (hereinafter simply referred to as a motor) 23 installed in the main body housing 21. The rotation is decelerated by the magnetic coupling device A2 and transmitted to the screw shaft 24 of the propulsion device 22 so that the slider 25 mounted on the outside of the main body housing 21 can be slid back and forth by the slider propulsion device 22. .

  The motor 23 and the slider propulsion device 22 are juxtaposed in the main body housing 21, and the magnetic coupling device A2 includes a driving pulley 27 with a flange fixed to the tip of the motor shaft 26 of the motor 23 and a screw that is a horizontal axis. Rotation is transmitted between the shaft 24 and the driven pulley 28 fixed to the tip of the extension shaft 24a with the following structure.

  Both the drive side and driven side pulleys 27 and 28 have teeth on the outer peripheral surface that mesh with the teeth of the timing 29 wound between them, and the rotation of the driving side pulley 27 passes through the timing 29 and the driven side pulleys. 28. A driving side magnetic coupling member 30 is attached to the driving pulley 27 so as to rotate integrally therewith, and a driven side magnetic coupling member 31 is attached to the driven pulley 28 so as to rotate integrally therewith. Yes. That is, the driving side magnetic coupling member 30 is fixed to the motor shaft 26 together with the driving side pulley 27, and the driven side magnetic coupling member 31 is fixed to the extension shaft 24 a of the screw shaft 24 together with the driven side pulley 28. Yes. Between the driving side magnetic coupling member 30 and the driven side magnetic coupling member 31, an intermediate magnetic coupling member 32 is separately rotated by a bearing 34 on an intermediate shaft 33 fixed in the main body housing 21. It is freely supported.

  These three magnetic coupling members 30, 31 and 32 are ring-shaped and are so-called magnetic rings in which N and S alternating magnetic poles are formed on the circumference, and the N and S poles are alternately arranged. Opposing the magnetic force in the circumferential direction, the torque of the driving side magnetic coupling member 30 is transmitted to the driven side magnetic coupling member 32 through the intermediate magnetic coupling 31 without contact.

  The screw shaft 24 of the slider propulsion device 22 is supported by a bearing 35 in the main body housing 21. The screw shaft 24 is screwed with a propelling member 36 in the main body housing 21 by a ball screw 37. The propulsion member 36 is connected to the slider 25 that slides along the rail 38 on the upper surface of the main body housing 21 and a connecting rod 39. When the propulsion member 36 is propelled by the rotation of the screw shaft 24, The slider 25 slides integrally.

  According to such an electric slider, the rotation of the motor 23 is such that torque is transmitted between the driving side magnetic coupling member 30, the intermediate magnetic coupling 32, and the driven side magnetic coupling member 31 in a non-contact state by magnetic force. Therefore, backlash among the driving pulley 27, the timing belt 29, and the driven pulley 28 is prevented, and noise and tooth wear due to contact between the teeth are also prevented.

  Then, the rotation is transmitted to the screw shaft 24 which is the horizontal axis, and when the propulsion member 36 is propelled by the rotation of the screw shaft 24, the slider 25 slides along the rail 38 on the main body housing 21 together with the propulsion member 36. Is done.

  The magnetic coupling device A1 according to the first embodiment can be applied to an electric slider instead of the magnetic coupling device A2 according to the second embodiment. The magnetic coupling device A2 according to the second embodiment can also be applied to the embodiment. 1 can be applied to an electric rotary actuator instead of the magnetic coupling device A1 in FIG.

It is a top view of Example 1 which applied the present invention to an electric rotary actuator. It is the left view. It is the right view. It is sectional drawing in the X1-X1 line position of FIG. It is sectional drawing in the X2-X2 line position of FIG. It is sectional drawing in the YY line position of FIG. It is sectional drawing in the Z1-Z1 line position of FIG. It is sectional drawing in the Z2-Z2 line position of FIG. FIG. 3 is a schematic diagram showing a magnetic pole relationship of N and S of both the driving side and driven side magnetic coupling members in Example 1. It is a figure which shows the relationship between the meshing of the drive side gear and driven side gear in Example 1, and the torque waveform by a magnetic coupling. It is the enlarged view. It is a figure which shows the relationship of the meshing which the mutual tooth | gear of a drive side gear and a driven side gear does not contact, and the torque waveform by a magnetic coupling. It is a figure which shows the relationship between the meshing when a tooth | gear contacts, and the torque waveform by a magnetic coupling. It is a graph which shows the relationship between the rotation angle-torque characteristic of a magnetic coupling, and the rotation angle-torque characteristic of a stepping motor. It is a right view of Example 2 which applied this invention to the electric slider. It is the left view. It is sectional drawing in the XX line position of FIG. Similarly, it is a cross-sectional view at the YY line position. It is a left side view. It is sectional drawing in the ZZ line position of FIG.

Explanation of symbols

A1 Magnetic coupling device 1 Main body housing 2 Hypoid gear device 3 Stepping motor 4 Rotor 4a collar 5 Motor shaft 6 Drive side gear 7 Pinion gear shaft 7a Pinion gear shaft base 8 Drive side gear 9 Drive side magnetic coupling member 10 Driven Side magnetic coupling member 11 Base end side bearing 12 Front end side bearing 13 Hollow portion 14 Fixed ring 15 Hypoid pinion gear 16 Hypoid ring gears 17 and 18 Bearing A2 Magnetic coupling device 21 Main body housing 22 Propulsion device 23 Stepping motor screw shaft 24
24a extension shaft 25 slider 26 motor shaft 27 driving pulley 28 driven pulley 29 timing 30 driving magnetic coupling member 31 driven magnetic coupling member 32 intermediate magnetic coupling member 33 intermediate shaft 34 bearing 35 bearing 36 propulsion member 37 Ball screw 38 Rail 39 Connecting rod

Claims (9)

  A magnetic coupling member in which N and S alternating magnetic poles are formed on the circumference is attached to each of the rotating body on the driving side and the driven side having teeth, and the driving side magnetic coupling member is provided on the driving side rotating body. A magnetic coupling device characterized in that, by being rotated, a torque due to a magnetic force is generated between the driven side magnetic coupling member and the torque is transmitted to the driven side rotating body.   In each of the driving side rotating body and the driven side rotating body, a ring-shaped magnetic coupling member is attached to a side surface of the rotating body, and the peripheral surfaces of both magnetic coupling members are opposed to each other. Item 2. A magnetic coupling device according to Item 1.   3. The magnetic coupling device according to claim 1, wherein a diameter of the rotating body and the magnetic coupling member on the driving side is different from a diameter of the rotating body and the magnetic coupling member on the driven side.   The drive-side rotator and the driven-side rotator are the drive-side gear and the driven-side gear, and these gears are usually combined so that their teeth are not in contact with each other, and the drive-side magnetic coupling member is driven. The magnetic cup according to any one of claims 1 to 3, wherein when the torque more than the torque due to the magnetic force between the magnetic coupling member on the side is applied, the teeth of each other come into contact with each other. Ring device.   The driving-side rotating body and the driven-side rotating body are a driving-side pulley and a driven-side pulley to which rotation is transmitted via a timing belt, and a driving-side magnetic coupling member attached to the driving-side pulley and a driven-side pulley An intermediate magnetic coupling member is interposed between the magnetic coupling member on the driven side attached to the magnetic coupling member, and torque due to magnetic force is transmitted to the magnetic coupling member on the driven side via the magnetic coupling member. The magnetic coupling device according to any one of claims 1 to 3,   The rotating body and the driving side and driven side magnetic coupling members are incorporated in the electric rotary actuator so that the driving side rotating body is rotated by a motor and the driven side rotating body rotates the rotor. The magnetic coupling device according to claim 1.   These pulleys, a driving side, a driven side, and an intermediate magnetic coupling member are incorporated in an electric rotary actuator so that the driving side pulley is rotated by a motor and the driven side pulley rotates the rotor. The magnetic coupling device according to claim 5.   The rotating body, the driving side, and the driven side magnetic coupling member are incorporated in the electric slider so that the driving side rotating body is rotated by the motor and the driven side rotating body rotates the screw shaft that slides the slider. The magnetic coupling device according to claim 1, wherein the magnetic coupling device is a magnetic coupling device.   These pulleys, the driving side, the driven side, and the intermediate magnetic coupling member are incorporated in the electric slider so that the driving side pulley is rotated by the motor and the driven side pulley rotates the screw shaft that slides the slider. The magnetic coupling device according to claim 5.

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