JP2014126100A - Magnetic coupling device and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic coupling device capable of sufficiently fixing a magnet part and suppressing a damage caused on a holding part and the magnet part.SOLUTION: A magnetic coupling device 100 includes: a rotatable load side rotary body 10 formed of a magnet part 10a and one holding part 13 for allowing magnets 12 to be fixed by applying pressure to the magnet part 10a; and a drive side rotary body 20 for magnetically coupling with the load side rotary body 10. The holding part 13 is formed of a material having a smaller degree of contraction by cooling than the magnet part 10a, and an inner peripheral surface 13b of an insertion hole 13a of the holding part 13 is formed in a tapered shape such that a hole diameter gradually reduces. An outer peripheral surface 10b of the magnet part 10a is formed in a tapered shape such that an outer diameter gradually reduces so as to correspond to the tapered shape of the inner peripheral surface 13b of the insertion hole 13a. The magnet part 10a is inserted and fixed in the holding part 13 by a cooling fitting process.

Description

  The present invention relates to a magnetic coupling device and a method for manufacturing the magnetic coupling device, and more particularly to a magnetic coupling device including a coupling body including a magnet portion and a holding portion, and a method for manufacturing the magnetic coupling device.

  Conventionally, a coupling body including a magnet part and a holding part is known (see, for example, Patent Document 1).

  Patent Document 1 includes a rotor hub, a magnet portion including a plurality of magnets disposed on the surface of the rotor hub, and carbon fiber reinforced plastic (CFRP), and is fitted (press-fitted) onto the outer peripheral surfaces of the plurality of magnets. A permanent magnet rotor with a plurality of retaining rings is also disclosed. The outer periphery of the magnet portion of the permanent magnet rotor is formed in a taper shape from one end side to the other end side in the rotation axis direction. Further, the plurality of holding rings are fitted to the outer peripheral surfaces of the plurality of magnets so as to be adjacent along the rotation axis direction. Here, the hole diameters of the plurality of holding rings are formed so as to be different from each other (so as to be gradually reduced) so as to correspond to the tapered magnet portion. Furthermore, the hole diameter of the plurality of holding rings is slightly smaller than the outer diameter of the position where each holding ring is fitted in the tapered magnet portion, so that a predetermined tightening margin (magnet) The difference between the outer diameter of the magnet portion and the hole diameter of the retaining ring when the outer diameter of the portion is larger than the hole diameter of the retaining ring is ensured. The plurality of holding rings are individually press-fitted into the outer peripheral surfaces of the plurality of magnets.

Japanese Patent Laid-Open No. 8-265997

  However, in the permanent magnet rotor disclosed in Patent Document 1, it is necessary to form the plurality of holding rings with different diameters, and it is necessary to press-fit the plurality of holding rings individually. Due to non-uniformity of pressure (internal pressure) due to the holding ring, there is a problem that the magnet is rattled, and as a result, the magnet portion cannot be sufficiently fixed. In addition, since it is necessary to press-fit into the magnet part with a predetermined tightening margin (difference between the outer diameter of the magnet part and the hole diameter of the retaining ring) in the retaining ring, the amount of the tightening margin has been secured. It is necessary to apply a large force along the retaining ring to widen the retaining ring. Here, since the force required to spread the holding ring made of CFRP having a large tensile elastic modulus becomes very large, there is a problem that the holding ring and the magnet part are easily damaged during press-fitting.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to prevent the holding portion and the magnet portion from being damaged while sufficiently fixing the magnet portion. It is an object of the present invention to provide a possible magnetic coupling device and a method for manufacturing the magnetic coupling device.

  A magnetic coupling device according to a first aspect of the present invention has a magnet part having a magnet and an insertion hole into which the magnet part is inserted, and applies pressure to the magnet part inserted into the insertion hole to fix the magnet. A rotatable first coupling body including one holding portion capable of being moved, and a second cup disposed in a non-contact state with respect to the first coupling body and magnetically coupled to the first coupling body And the holding part is made of a material that is less likely to contract by cooling than the magnet part, and the inner peripheral surface of the insertion hole of the holding part is one end part in the rotation axis direction of the first coupling body From the side to the other end side, it is formed in a taper shape so that the hole diameter decreases, and the outer peripheral surface of the magnet portion is in the direction of the rotation axis so as to correspond to the taper shape of the inner peripheral surface of the insertion hole From one end side to the other end side Selfish, is formed in a tapered shape so that the outer diameter decreases, the magnet portion is fixed by being inserted by fit process be cooled to the holding portion.

  In the magnetic coupling device according to the first aspect of the present invention, as described above, the first coupling body applies pressure to the magnet part having the magnet and the magnet part inserted into the insertion hole to fix the magnet. By including the one holding portion that can be used, it is possible to suppress nonuniform pressure (internal pressure) due to the plurality of holding portions, unlike the case where the holding portions are plural. In addition, by inserting and fixing the magnet part to the holding part by a cooling fit process, the magnet part contracted by cooling can be inserted into the holding part, so the hole diameter of the insertion hole of the holding part can be reduced. Even with the tightening margin (difference between the outer diameter of the magnet part and the hole diameter of the insertion hole of the holding part) formed smaller than the outer diameter of the magnet part, the magnet can be used with less force than press-fitting. The part can be inserted into the holding part. Thereby, it can suppress that a holding | maintenance part and a magnet part are damaged.

  Further, in the magnetic coupling device according to the first aspect of the present invention, the inner peripheral surface of the insertion hole of the holding portion is directed from the one end side to the other end side in the rotation axis direction of the first coupling body. A tapered shape is formed so that the hole diameter is small, and the outer peripheral surface of the magnet portion is directed from one end side to the other end side in the rotation axis direction so as to correspond to the tapered shape of the inner peripheral surface of the insertion hole. Then, it is formed in a tapered shape so that the outer diameter becomes small, and the magnet part is inserted and fixed to the holding part by a cold fitting process. Unlike the case where the inner peripheral surface of the insertion hole of the holding portion and the outer peripheral surface of the magnet portion are not tapered, the magnet portion is inserted into the insertion hole of the holding portion in the cooling fit process. In addition, it is only necessary to insert from the location with the larger hole diameter toward the location with the smaller hole diameter, so the magnet portion and the holder are held in consideration of the radial tolerance of the magnet portion and the tolerance of the hole diameter of the insertion hole of the holding portion. It is not necessary to secure a gap between the parts. As a result, the cold fitting process can be performed in a state where the tapered magnet part is inserted into the insertion hole of the tapered holding part, so that the magnet part expands to the original size after the cold fitting process. When returning, a sufficient pressure (internal pressure) can be applied to the magnet portion by the holding portion.

  Also, if the insertion holes of the magnet part and the holding part are not tapered, a large frictional force will be generated between the magnet part and the holding part, so that the magnet part must be inserted into the holding part with a strong pressing force. In addition, the thickness of the holding portion had to be secured so that it would not break due to friction at that time, whereas in the present invention, the insertion hole of the magnet portion and the holding portion has a tapered shape. By being formed, when the magnet part is inserted into the insertion hole of the holding part, it is possible to suppress the generation of a large frictional force between the magnet part and the holding part, so the thickness of the holding part is increased. Without doing so, the magnet portion can be sufficiently fixed. Thereby, since the magnet part of the 1st coupling body can be brought closer to the 2nd coupling body which carries out magnetic coupling with the 1st coupling body, it is between the 1st coupling body and the 2nd coupling body. Force (torque) can be transmitted more efficiently.

In the magnetic coupling device according to the first aspect, preferably, the inclination angle θ in the tapered shape of the inner peripheral surface of the insertion hole of the holding portion and the tapered shape of the outer peripheral surface of the magnet portion is 0 <θ ≦ tan ^{−. 1} (0.2 / 10) is satisfied. If comprised in this way, a cold fitting process can be easily performed in the state which inserted the taper-shaped magnet part in the insertion hole of the taper-shaped holding | maintenance part, and contact | adhered both. Here, the “inclination angle θ” is an angle formed between the inner peripheral surface of the insertion hole of the holding portion and the rotation axis of the first coupling body, and the outer peripheral surface of the magnet portion and the rotation axis of the first coupling body. Means the angle between

  In the magnetic coupling device according to the first aspect, preferably, the thickness of the holding portion is set to a thickness such that the pressure by the holding portion is greater than the centrifugal force acting on the magnet portion. If comprised in this way, when a 1st coupling body rotates, it can suppress reliably that a holding | maintenance part is damaged by the centrifugal force which acts on a magnet part. The “centrifugal force” means an inertial force that works based on rotational motion.

  In the magnetic coupling device according to the first aspect described above, preferably, the thickness of the holding portion is configured to be constant along the rotation axis direction. If comprised in this way, since it is not necessary to vary the thickness of a holding | maintenance part along a rotating shaft direction, a holding | maintenance part can be formed easily.

  In the magnetic coupling device according to the first aspect, preferably, the holding portion is made of a nonmagnetic carbon fiber reinforced plastic. If comprised in this way, a holding | maintenance part can be reduced in weight with a carbon fiber reinforced plastic. In addition, since the carbon fiber reinforced plastic has high tensile strength, it is difficult for the holding portion to crack due to the centrifugal force that acts when the first coupling body rotates at high speed, and the thickness of the holding portion can be further reduced. . Thereby, a holding | maintenance part can be further reduced in weight. Moreover, since the holding part is non-magnetic, it is possible to suppress a decrease in torque transmission efficiency.

  In the magnetic coupling device according to the first aspect described above, preferably, the magnet unit is configured to space a plurality of magnets having a cylindrical yoke and a plurality of magnets closely contacting each other on the outer surface of the yoke. By arrange | positioning apart, it can suppress that magnets contact in the case of a cold fitting process resulting from the shrinkage | contraction degree by cooling of a magnet and a yoke differing. Thereby, it can suppress that a magnet is damaged.

  The manufacturing method of the magnetic coupling device according to the second aspect of the present invention has a magnet part having a magnet and an insertion hole into which the magnet part is inserted, and can fix the magnet by applying pressure to the magnet part. A rotatable first coupling body including a single holding portion, and a second coupling body that is disposed in a non-contact state with respect to the first coupling body and is magnetically coupled to the first coupling body. And the holding part is made of a material that is less likely to shrink by cooling than the magnet part, and the inner peripheral surface of the insertion hole of the holding part is formed on the inner surface of the first coupling body. Corresponding to the taper shape of the inner peripheral surface of the insertion hole, the process of forming the taper shape so that the hole diameter decreases from one end side to the other end side in the rotation axis direction In the direction of the rotation axis. Forming the taper shape so that the outer diameter decreases from the one end side to the other end side, and inserting the cooled magnet part into the cooled holding part. Process.

  In the method of manufacturing a magnetic coupling device according to the second aspect of the present invention, as described above, the first coupling body applies a pressure to the magnet part having the magnet and the magnet part inserted into the insertion hole. Unlike the case where a plurality of holding portions are included, it is possible to suppress the non-uniform pressure (internal pressure) due to the plurality of holding portions. In addition, by providing a cooling fit process for inserting the cooled magnet part into the cooled holding part, the magnet part contracted by cooling can be inserted into the holding part. Even if the hole diameter of the insertion hole in the part is smaller than the outer diameter of the magnet part and the tightening margin (difference between the outer diameter of the magnet part and the hole diameter of the insertion hole in the holding part) is secured The magnet part can be inserted into the holding part with a small force compared to the above. Thereby, it can suppress that a holding | maintenance part and a magnet part are damaged.

  Moreover, in the manufacturing method of the magnetic coupling device according to the second aspect of the present invention, the inner peripheral surface of the insertion hole of the holding portion is changed from one end side to the other end side in the rotation axis direction of the first coupling body. The step of forming the taper shape so that the hole diameter becomes smaller and the outer peripheral surface of the magnet portion from the one end side in the rotation axis direction to the other so as to correspond to the taper shape of the inner peripheral surface of the insertion hole And a step of forming the taper shape so that the outer diameter decreases toward the end side. This is different from the case where the inner peripheral surface of the insertion hole of the holding part and the outer peripheral surface of the magnet part are not formed in a tapered shape, when the magnet part is inserted into the insertion hole of the holding part in the cooling fit process. The magnet part and the holding part should be inserted in consideration of the radial tolerance of the magnet part and the hole diameter of the insertion hole of the holding part. There is no need to secure a gap between them. As a result, the cooling and fitting process can be performed in a state where the tapered magnet part is inserted into the insertion hole of the tapered holding part and the both are brought into close contact with each other, so that the magnet part expands after the cooling and fitting process. When returning to the original size, a sufficient pressure (internal pressure) can be applied to the magnet portion by the holding portion.

  In addition, when the insertion hole of the magnet part and the holding part is not tapered, the magnet part must be inserted into the holding part with a strong pressing force due to a large frictional force generated between the magnet part and the holding part. However, in the present invention, the insertion holes of the magnet part and the holding part are formed in a tapered shape, whereas the holding part has to have a sufficient thickness so that it does not break due to friction at that time. As a result, when the magnet portion is inserted into the insertion hole of the holding portion, it is possible to suppress the generation of a large frictional force between the magnet portion and the holding portion, so the thickness of the holding portion is increased. And the magnet part can be sufficiently fixed. Thereby, since the magnet part of the 1st coupling body can be brought closer to the 2nd coupling body which carries out magnetic coupling with the 1st coupling body, it is between the 1st coupling body and the 2nd coupling body. Force (torque) can be transmitted more efficiently.

  In the method of manufacturing a magnetic coupling device according to the second aspect, preferably, the cooling and fitting step is such that the outer diameter of the cooled magnet portion is the inner peripheral surface of the insertion hole of the holding portion in the cooled state. Including a step of inserting the magnet portion into the holding portion so as to be substantially the same as the hole diameter. If comprised in this way, a taper-shaped magnet part can be inserted in the insertion hole of a taper-shaped holding | maintenance part, and both can be contact | adhered reliably.

  In the method of manufacturing a magnetic coupling device according to the second aspect, preferably, in the step of forming the holding portion, the length of the holding portion in the rotation axis direction is larger than the length of the magnet portion in the rotation axis direction. And after the cooling and fitting step, the one end portion in the rotation axis direction of the holding portion and the one end portion in the rotation axis direction of the magnet portion are substantially flush with each other, and the rotation axis line of the holding portion A step of removing a part of the holding portion so that the other end portion in the direction and the other end portion in the rotation axis direction of the magnet portion are substantially flush with each other. If comprised in this way, after inserting a magnet part in the insertion hole of the holding | maintenance part formed large in the rotation-axis direction, after removing a part of holding | maintenance part, the length of a rotation-axis direction in a magnet part and a holding | maintenance part. Unlike the case where the two are aligned in advance, the one end in the rotation axis direction of the holding portion and the one end in the rotation axis direction of the magnet portion can be surely substantially flush with each other and the rotation of the holding portion can be ensured. The other end portion in the axial direction and the other end portion in the rotation axis direction of the magnet portion can be substantially flush. Thereby, since it can suppress that a holding | maintenance part becomes longer than a magnet part in a rotating shaft direction, it can suppress that a magnetic coupling apparatus enlarges in a rotating shaft direction. Moreover, since it can suppress that a magnet part becomes longer than a holding | maintenance part in a rotating shaft direction, a magnet part can be reliably fixed with a holding | maintenance part.

  In the method for manufacturing a magnetic coupling device according to the second aspect, preferably, before the cooling and fitting step, the plurality of magnets of the magnet portion are brought into close contact with the columnar yoke by magnetic force without using an adhesive. The method further includes a step. Here, the magnet joined to the yoke at the magnet portion is not the only time when the magnet portion expands and returns to its original size after the cooling and fitting process. It is sandwiched between and firmly held. That is, in the magnet part of the present invention, when inserting into the holding part, a large force does not act on the magnet of the magnet part, so it is not necessary to join the magnet and the yoke with an adhesive, and the adhesive part in the cold-fitting process There is no need to consider heat shrinkage and low temperature durability. Therefore, a 1st coupling body can be produced easily.

  In the present invention, as described above, the holding part and the magnet part can be prevented from being damaged while the magnet part is sufficiently fixed.

1 is a cross-sectional view illustrating a magnetic coupling device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the magnetic coupling device taken along line 200-200 in FIG. 1. It is the expanded sectional view which showed the magnet part and holding | maintenance part of the load side rotary body of the magnetic coupling apparatus by one Embodiment of this invention. It is sectional drawing for demonstrating the manufacturing method of the holding | maintenance part of the magnetic coupling apparatus by one Embodiment of this invention. It is sectional drawing for demonstrating the manufacturing method of the magnet part of the magnetic coupling apparatus by one Embodiment of this invention. It is sectional drawing which showed the state before the cooling fitting process of the load side rotary body of the magnetic coupling apparatus by one Embodiment of this invention. It is sectional drawing which showed before insertion of the magnet part of the magnetic coupling apparatus by one Embodiment of this invention. It is sectional drawing which showed after insertion of the magnet part of the magnetic coupling apparatus by one Embodiment of this invention. It is sectional drawing for demonstrating the cutting | disconnection and grinding | polishing process of the holding | maintenance part of the magnetic coupling apparatus by one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, with reference to FIGS. 1-3, the magnetic coupling apparatus 100 by one Embodiment of this invention is demonstrated. The load side rotating body 10 and the drive source side rotating body 20 described below are examples of the “first coupling body” and the “second coupling body” of the present invention, respectively. Will be described as an example of the first coupling body, and the drive source side rotating body 20 will be described as an example of the second coupling body.

  As shown in FIG. 1, a magnetic coupling device 100 according to an embodiment of the present invention transmits a driving force from a load side (not shown) to a load unit (not shown) and a driving source (not shown). A drive source side portion 2 that transmits driving force to the load side portion 1 and a separating member 3 that separates the space on the load side portion 1 side and the space on the drive source side portion 2 side are provided. The load side portion 1 and the drive source side portion 2 are both configured to be rotatable about a rotation axis A extending in the X direction as a rotation center, while the separating member 3 is fixed so as not to rotate and move. ing.

  The load side portion 1 has one end side (X1 side) connected to a load portion (not shown), a shaft portion 1a extending to the X1 side, and a load side connected to the other end portion side (X2 side) of the shaft portion 1a. The rotating body 10 is included. Further, the drive source side portion 2 is connected to a drive source (not shown) at one end side (X2 side), connected to the shaft portion 2a extending to the X2 side, and the other end portion side (X1 side) of the shaft portion 2a. Drive source side rotating body 20.

  As shown in FIGS. 1 and 2, the load-side rotating body 10 covers a magnet portion 10a composed of a regular columnar yoke 11 and a plurality of arcuate magnets 12 and the magnet portion 10a from the outside in the radial direction. And a cylindrical holding portion 13. The length of the magnet portion 10a in the X direction is L1.

  The yoke 11 is made of SS400, which is a general structural steel material. The yoke 11 has an outer surface 11a to which the plurality of magnets 12 are brought into close contact with each other by the magnetic force of the magnet 12, and an insertion hole 11b that is formed along the rotation axis A and into which the shaft portion 1a is inserted and fixed. Yes. As shown in FIG. 1, the outer surface 11a is formed to extend substantially in parallel along the X direction (rotational axis direction). That is, the diameter R1 of the radial direction orthogonal to the X direction of the yoke 11 does not change along the X direction. The length of the yoke 11 in the X direction is L1.

  The plurality of magnets 12 are composed of neodymium magnets (Nd—Fe—B based sintered magnets). The inner peripheral surface of each of the plurality of magnets 12 is formed in an arcuate shape that curves along the outer surface 11 a of the yoke 11. The plurality of magnets 12 includes 18 N-pole magnets 112 and 18 S-pole magnets 212. The N-pole magnet 112 refers to the magnet 12 whose magnetic pole on the outer peripheral surface side is N-pole, and the S-pole magnet 212 refers to the magnet 12 whose magnetic pole on the outer peripheral surface side is S-pole.

  As shown in FIG. 3, three N-pole magnets 112 and three S-pole magnets 212 are arranged along the rotation axis A on the outer surface 11 a of the yoke 11. In addition, as shown in FIG. 2, six N-pole magnets 112 and six S-pole magnets 212 are alternately arranged at equal angular intervals along the rotation direction B on the outer surface 11 a of the yoke 11. ing. As shown in FIGS. 2 and 3, each magnet 12 is arranged along the X direction and the B direction so as to have a distance d having a size of about 1 mm or less.

Here, in this embodiment, the outer peripheral surface 10b of the magnet portion 10a is formed so as to incline radially inward (rotation axis A side) from the X1 side toward the X2 side, as shown in FIG. ing. That is, the outer peripheral surface 10b of the magnet portion 10a is formed in a tapered shape so that the outer diameter decreases from the X1 side toward the X2 side. Specifically, at the end portion 10c on the X1 side of the magnet portion 10a, the magnet 12 has a radial thickness t1, and at the end portion 10d on the X2 side, the magnet 12 has a radial direction smaller than the thickness t1. It has a thickness t2. The outer peripheral surface 10b of the magnet portion 10a is inclined at an inclination angle α that satisfies 0 <α ≦ tan ⁻¹ (0.2 / 10) so that the outer diameter decreases from the X1 side toward the X2 side. doing. In addition, the taper shape of the outer peripheral surface 10b of the magnet part 10a is formed by making the outer peripheral surface of the magnet 12 into a taper shape. The inclination angle α is an example of the “inclination angle θ” in the present invention.

  Further, as shown in FIG. 1, the outer diameter R2 (= the outer diameter R1 of the yoke 11+ (the thickness t1 × 2 of the magnet 12)) at the end portion 10c on the X1 side of the magnet portion 10a is equal to the X2 side of the magnet portion 10a. It becomes larger than the outer diameter R3 (= the outer diameter R1 of the yoke 11+ (the thickness t2 × 2 of the magnet 12)) at the end portion 10d.

  In the present embodiment, the cylindrical holding portion 13 is formed with an insertion hole 13a formed so as to penetrate in the X direction and into which the magnet portion 10a is inserted. Further, the inner peripheral surface 13b of the insertion hole 13a of the holding portion 13 is formed so as to incline radially inward (rotation axis A side) from the X1 side toward the X2 side. That is, as shown in FIG. 4, the inner peripheral surface 13b of the insertion hole 13a of the holding portion 13 has a tapered shape such that the diameter (hole diameter) of the radial hole decreases from the X1 side toward the X2 side. Is formed.

Specifically, as shown in FIG. 1, the holding portion 13 has a hole diameter R2 at the end portion 13c on the X1 side, and a hole diameter R3 smaller than the hole diameter R2 at the end portion 13d on the X2 side. Have. That is, the inner peripheral surface 13b of the insertion hole 13a of the holding portion 13 satisfies 0 <β ≦ tan ⁻¹ (0.2 / 10) so that the hole diameter decreases from the X1 side toward the X2 side. It is inclined at an inclination angle β. The inclination angle β is an example of the “inclination angle θ” in the present invention.

Further, the inclination angle β of the inner peripheral surface 13b of the insertion hole 13a of the holding portion 13 is substantially equal to the inclination angle α of the outer peripheral surface 10b of the magnet portion 10a. As a result, as shown in FIGS. 1 and 3, the outer peripheral surface 10b of the magnet portion 10a and the inner peripheral surface 13b of the insertion hole 13a of the holding portion 13 are formed in a tapered shape so as to correspond to each other. Here, it is preferable that the inclination angles α and β satisfy 0 <α (β) ≦ tan ⁻¹ (0.1 / 10).

  Further, as shown in FIG. 3, the holding portion 13 is configured to have a substantially constant thickness t3 along the X direction (rotational axis direction). That is, the outer peripheral surface 13e of the holding portion 13 is inclined at substantially the same inclination angle β as the inner peripheral surface 13b of the insertion hole 13a. Further, the thickness t3 of the holding portion 13 is preferably less than about one-half of the thickness of the magnet 12, and more preferably about one-fourth or less. Further, the thickness t3 of the holding portion 13 is set to such a thickness that the pressure (internal pressure) by the holding portion 13 is larger than the centrifugal force acting on the magnet portion 10a. Furthermore, the thickness t3 of the holding part 13 is set to a thickness that is larger than the centrifugal force acting on the holding part 13.

  The holding unit 13 is made of nonmagnetic carbon fiber reinforced plastic (CFRP). This CFRP has a very small coefficient of thermal expansion and has a property of hardly shrinking even when it is changed from a normal temperature (about 20 ° C.) state to a boiling point of liquid nitrogen (−196 ° C.). Therefore, it is less likely to contract by cooling than the SS 400 constituting the yoke 11 and the neodymium magnet constituting the magnet 12. In addition, CFRP is comprised from the base material which consists of resin materials, such as an epoxy resin, and the reinforcement material which consists of carbon fiber whose tensile elasticity modulus is about 600 GPa or more. Moreover, the tensile elastic modulus of the holding part 13 made of CFRP is about half of the tensile elastic modulus of the carbon fiber. Further, the length of the holding portion 13 in the X direction is substantially equal to the length L1 of the magnet portion 10a in the X direction.

  In this embodiment, as will be described in detail in the manufacturing method of the magnetic coupling device 100 described below, the insertion hole 13a of the holding portion 13 is formed slightly smaller in the radial direction than the magnet portion 10a. The margin (the difference between the outer diameter of the magnet part 10a and the hole diameter of the insertion hole 13a of the holding part 13) is secured. Further, the magnet portion 10a formed relatively larger in the radial direction than the insertion hole 13a of the holding portion 13 is inserted into and fixed to the insertion hole 13a of the holding portion 13 by a cold fitting process. Thereby, the inner peripheral surface 13b of the insertion hole 13a of the holding portion 13 is brought into close contact with the outer peripheral surface 10b of the magnet portion 10a, and the holding portion 13 applies pressure (internal pressure) toward the inner side in the radial direction with respect to the magnet portion 10a. It is configured to be added. As a result, the plurality of magnets 12 are configured to be fixed while being restrained from moving in the radial direction.

  Further, the X1 side end portion 10c of the magnet portion 10a and the X1 side end portion 13c of the holding portion 13 are configured to be substantially flush with each other, and the X2 side end portion 10d of the magnet portion 10a and the holding portion 13 are held. The end portion 13d on the X2 side of the portion 13 is configured to be substantially flush with the end portion 13d.

  As shown in FIGS. 1 and 2, the drive source side rotating body 20 includes a cylindrical portion 21 that also serves as a yoke, and a magnet portion 22. As shown in FIG. 1, the cylindrical portion 21 is formed in a bottomed cylindrical shape centered on the rotation axis A and having an opening on the X1 side. Further, the load side rotating body 10 and the separating member 3 are arranged inside the cylindrical portion 21 of the drive source side rotating body 20. Further, a magnet portion 22 and a pair of pressing portions 23 are disposed on the inner peripheral surface 21 a of the cylindrical portion 21 that faces the outer peripheral surface of the load-side rotator 10 of the drive source side rotator 20. The pair of pressing portions 23 has a function of suppressing movement of the magnet portion 22 in the X direction by being disposed at both ends of the magnet portion 22 in the X direction (rotation axis direction). In addition, the magnet part 22 of the drive source side rotary body 20 is not formed in a taper shape, but is formed substantially parallel along the X direction.

  Moreover, the magnet part 22 has 36 magnets (18 N-pole magnets 122 and 18 S-pole magnets 222) made of neodymium magnets (Nd—Fe—B based sintered magnets). These magnets are arranged so as to face the respective magnets 12 of the magnet portion 10a in the load-side rotating body 10. Specifically, as shown in FIG. 1, in the magnet unit 22, as in the magnet unit 10 a, three N-pole magnets 122 and three S-pole magnets 222 are arranged along the rotation axis A. Has been. Further, as shown in FIG. 2, in the magnet unit 22, as in the magnet unit 10a, six N-pole magnets 122 and six S-pole magnets 222 alternate at equal angular intervals along the rotation direction B. Is arranged. The N-pole magnet 122 refers to a magnet in which the magnetic pole on the radially inner side (the load-side rotating body 10 side) is an N-pole, and the S-pole magnet 222 is the magnetic pole on the radially inner side of the S-pole. Refers to the magnet.

  Moreover, the magnet part 10a and the magnet part 22 are comprised so that it may carry out a magnetic coupling mutually. Specifically, as shown in FIG. 2, in the initial state of the magnetic coupling device 100, the N-pole magnet 112 of the magnet unit 10a and the S-pole magnet 222 of the magnet unit 22 face each other, and the magnet unit 10a The S-pole magnet 212 and the N-pole magnet 122 of the magnet portion 22 are configured to face each other. When the drive source side rotator 20 (see FIG. 1) rotates around the rotation axis A, the S pole magnet 212 of the magnet portion 10a of the load side rotator 10 (see FIG. 1) is opposed to the magnet portion 22. The N-pole magnet 122 is driven with a slight shift, and rotates in the rotational direction B. Similarly, the N-pole magnet 112 of the magnet unit 10a is driven in a state slightly shifted from the S-pole magnet 222 of the opposing magnet unit 22 and rotates along the rotational direction B, thereby rotating the load side. The body 10 rotates about the rotation axis A together with the drive source side rotating body 20. As a result, the driving force around the rotation axis A of the drive source side rotating body 20 is transmitted as the driving force around the rotation axis A of the load side rotating body 10.

  In the present embodiment, as described above, the load-side rotator 10 includes the magnet portion 10a and the cylindrical holding portion 13 that covers the magnet portion 10a from the outside in the radial direction. Unlike the case where the holding part 13 is composed of a plurality of parts, the structure is such that a plurality of magnets 12 are fixed by applying a pressure (internal pressure) toward the inside in the radial direction with respect to 10a. It can suppress that a pressure (internal pressure) becomes non-uniform | heterogenous.

  Moreover, in this embodiment, the diameter (hole diameter) of the radial hole in which the magnet part 10a is arrange | positioned becomes small toward the inner peripheral surface 13b of the insertion hole 13a of the holding | maintenance part 13 from X1 side to X2 side. The outer peripheral surface 10b of the magnet portion 10a is formed in a tapered shape so that the outer diameter decreases from the X1 side toward the X2 side. Moreover, the outer peripheral surface 10b of the magnet part 10a and the inner peripheral surface 13b of the insertion hole 13a of the holding | maintenance part 13 are formed in a taper shape so that it may mutually correspond. With this configuration, unlike the case where the inner peripheral surface 13b of the insertion hole 13a of the holding portion 13 and the outer peripheral surface 10b of the magnet portion 10a are not tapered, the magnet portion 10a is inserted into the holding portion 13 in the cold fitting process. When inserting into the hole 13a, it only needs to be inserted from a portion with a large hole diameter toward a portion with a small hole diameter. Therefore, it is not necessary to secure a gap between the magnet portion 10a and the holding portion 13. As a result, the cooling and fitting process can be performed in a state where the tapered magnet part 10a is inserted into the insertion hole 13a of the tapered holding part 13, so that the magnet part 10a expands after the cooling and fitting process. When returning to the size, a sufficient pressure (internal pressure) can be applied to the magnet portion 10 a by the holding portion 13.

  Moreover, when the insertion hole 13a of the magnet part 10a and the holding | maintenance part 13 is not made into the taper shape, when a big frictional force arises between the magnet part 10a and the holding | maintenance part 13, a magnet is made to the holding | maintenance part 13 with a strong pressing force. The portion 10a has to be inserted, and the thickness t3 of the holding portion 13 has to be secured so as not to break due to friction at that time. 10a and the insertion hole 13a of the holding part 13 are formed in a tapered shape, so that when the magnet part 10a is inserted into the insertion hole 13a of the holding part 13, large friction is caused between the magnet part 10a and the holding part 13. Since the generation of force can be suppressed, the magnet portion 10a can be sufficiently fixed without increasing the thickness t3 of the holding portion 13. As a result, the magnet portion 10a of the load-side rotator 10 can be brought closer to the drive-source-side rotator 20 that is magnetically coupled to the load-side rotator 10, so that the load-side rotator 10 and the drive-source-side rotator 20 The force (torque) can be transmitted more efficiently.

In the present embodiment, the outer peripheral surface 10b of the magnet portion 10a satisfies 0 <α ≦ tan ⁻¹ (0.2 / 10) so that the outer diameter decreases from the X1 side toward the X2 side. In addition to inclining at an inclination angle α, the inner peripheral surface 13b of the insertion hole 13a of the holding portion 13 is 0 <β ≦ tan ⁻¹ (0.2 /) so that the hole diameter decreases from the X1 side toward the X2 side. Inclination is performed at an inclination angle β that satisfies 10). By comprising in this way, a cold fitting process can be easily performed in the state which inserted the taper-shaped magnet part 10a in the insertion hole 13a of the taper-shaped holding | maintenance part 13, and made both closely_contact | adhere. Moreover, since it can suppress that the space | interval of the load side rotary body 10 formed in the taper shape and the drive source side rotary body 20 which is not formed in the taper shape differs greatly on the X1 side and the X2 side. In the magnetic coupling device 100, it is possible to prevent the magnetic coupling state from greatly differing between the X1 side and the X2 side. Thereby, it can suppress that transmission of the force (torque) between the load side rotary body 10 and the drive source side rotary body 20 becomes unstable.

  Moreover, in this embodiment, the thickness t3 of the holding part 13 is set to such a thickness that the pressure (internal pressure) by the holding part 13 is larger than the centrifugal force acting on the magnet part 10a, whereby the load-side rotating body 10 It is possible to reliably prevent the holding portion 13 from being damaged by the centrifugal force acting on the magnet portion 10a during rotation.

  In the present embodiment, the holding portion 13 is configured to have a substantially constant thickness t3 along the rotation axis direction, so that the thickness t3 of the holding portion 13 does not need to be varied along the rotation axis direction. Therefore, the holding part 13 can be formed easily.

  Moreover, in this embodiment, since the holding | maintenance part 13 consists of nonmagnetic CFRP, while being able to reduce the weight of the holding | maintenance part 13, and the tensile elasticity modulus of the holding | maintenance part 13 is large, it is a magnet after a cold fitting process. When the portion 10a expands and returns to its original size, the deformation amount of the holding portion 13 can be sufficiently reduced. Furthermore, since CFRP has high tensile strength, it is difficult for the holding portion 13 to break due to the centrifugal force that acts when the load-side rotating body 10 rotates at high speed, and the thickness t3 of the holding portion 13 can be reduced. Thereby, the further weight reduction of the holding | maintenance part 13 can be achieved. Further, since the holding portion 13 is non-magnetic, it is possible to suppress the unstable state of the magnetic coupling between the load-side rotator 10 and the drive source-side rotator 20, and lower the torque transmission efficiency. Can be suppressed.

  Moreover, in this embodiment, the magnet part 10a is easily formed by comprising the magnet part 10a from the regular columnar yoke 11 and the plurality of magnets 12 that are in close contact with the outer surface 11a of the yoke by magnetic force. be able to.

  In the present embodiment, the magnets 12 and the yokes 11 are arranged in the cooling and fitting process by arranging the magnets 12 along the X direction and the B direction so that the distance d is about 1 mm or less. The magnets 12 can be prevented from coming into contact with each other due to different degrees of shrinkage due to cooling. Thereby, it can control that magnet 12 is damaged.

  Next, a manufacturing process of the magnetic coupling device 100 will be described with reference to FIGS. 1, 2, and 4 to 9.

First, the cylindrical holding part 13 made of CFRP is produced. Specifically, as shown in FIG. 4, after winding a carbon fiber (not shown) soaked in resin on the outer surface 101a of the rotating mandrill 101 to a thickness t3. Apply heat to cure the resin. Thereby, the cylindrical holding | maintenance part 13 which consists of CFRP is produced. At this time, as the mandrill 101, the mandrill 101 whose outer surface 101a is inclined at an inclination angle β satisfying 0 <β ≦ tan ⁻¹ (0.2 / 10) is used. Thereby, the inner peripheral surface 13b of the insertion hole 13a of the holding portion 13 is formed in a tapered shape so as to be inclined at the inclination angle β.

  Moreover, the holding | maintenance part 13 is formed with the length L2 larger than the length L1 of the X direction in the load side rotary body 10 shown in FIG. At this time, the end portion 13c on the X1 side of the holding portion 13 has a hole diameter R4 larger than the hole diameter R2 in the load side rotating body 10 shown in FIG. 1, and the end portion 13d on the X2 side is shown in FIG. It is formed to have a hole diameter R5 that is smaller than the hole diameter R3 in the load-side rotating body 10.

  At this time, considering the shrinkage due to the cold fit, the holding portion 13 is formed to be small by the tightening allowance.

  Further, as shown in FIG. 5, a regular cylindrical yoke 11 is prepared. In addition, in consideration of the shrinkage caused by the cold fit in the previous stage, it has been described that the holding portion 13 is formed to be as small as the tightening allowance, but the radial diameter R1a of the yoke 11 is the diameter of the load-side rotating body 10 shown in FIG. The same effect can be obtained even if the predetermined size (tightening allowance) is made larger than R1.

  Then, 36 magnets 12 (18 N-pole magnets 112 and 18 S-pole magnets 212) having a thickness t1 in the radial direction are brought into close contact with the outer surface 11a of the regular columnar yoke 11. At this time, three N-pole magnets 112 and three S-pole magnets 212 are arranged side by side along the rotation axis A, and as shown in FIG. 2, six N-pole magnets 112 and six S-pole magnets are arranged. The polar magnets 212 are alternately arranged along the rotation direction B at equal angular intervals. At this time, the 36 magnets 12 are brought into close contact with the outer surface 11a of the yoke 11 by magnetic force without using an adhesive.

  Then, as shown in FIG. 5, the magnet unit 10 a is fixed in the X direction (rotational axis direction) by sandwiching the magnet unit 10 a from both sides in the X direction using the fixing jig 102. Moreover, the length of the X direction of the magnet part 10a is L1 similarly to the load side rotary body 10 shown in FIG. That is, the length L2 of the holding part 13 in the X direction is larger than the length L1 of the magnet part 10a in the X direction.

And the process which forms a taper shape in the outer peripheral surface 10b of the magnet part 10a is performed using the grinding | polishing apparatus 103. FIG. In the taper-shaped processing, the outer periphery of the magnet unit 10a is moved by rotating the polishing device 103 while rotating the polishing device 103 in the X direction by slightly tilting the rotation shaft of the polishing device 103 with respect to the rotation shaft of the magnet unit 10a. The surface 10b is polished so that the outer diameter decreases from the X1 side toward the X2 side. At this time, the outer peripheral surface 10b of the magnet portion 10a is polished so as to be inclined at an inclination angle α that satisfies 0 <α ≦ tan ⁻¹ (0.2 / 10). Accordingly, the thickness of the magnet 12 remains the thickness t1 at the end portion 10c on the X1 side of the magnet portion 10a, while the thickness of the magnet 12 is smaller than the thickness t1 at the end portion 10d on the X2 side. Thus, a tapered shape is formed on the outer peripheral surface 10b of the magnet portion 10a.

  As a result, the magnet portion 10a has a predetermined size (described above) in the radial direction from the load-side rotating body 10 shown in FIG. 1 (the insertion hole 13a of the holding portion 13 at the position where the magnet portion 10a is actually inserted). (Tightening allowance) only increases. Specifically, the outer diameter R2a (= the outer diameter R1a of the yoke 11+ (the thickness t1 × 2 of the magnet 12)) at the end portion 10c on the X1 side of the magnet portion 10a and the outer diameter R3a at the end portion 10d on the X2 side. (= The outer diameter R1a + of the yoke 11 (the thickness t2 × 2 of the magnet 12)) is larger than the outer diameters R2 and R3 in the load-side rotating body 10 shown in FIG. At the same time, it becomes larger along the X direction by a predetermined size (tightening allowance) in the radial direction than the load side rotating body 10 shown in FIG.

  Then, as shown in FIGS. 6 to 8, a cold fitting process for inserting the magnet portion 10 a into the holding portion 13 is performed. Specifically, first, as shown in FIG. 6, the X1 side (the side with the larger hole diameter) of the holding portion 13 is positioned on the opening 104 a side of the cooling container 104 in the cooling container 104 filled with liquid nitrogen. Thus, the holding part 13 is arranged. And the holding | maintenance part 13 is cooled until it will be in the state of the temperature substantially the same as the boiling point (-196 degreeC) of liquid nitrogen. In this cooling process, the holding portion 13 hardly contracts.

  And after the holding | maintenance part 13 is fully cooled, by inserting the magnet part 10a in the cooling container 104 from the X2 side (small outer diameter side) of the magnet part 10a, the X2 side of the magnet part 10a is inserted. The end portion 10d is disposed so as to face the end portion 13c on the X1 side of the holding portion 13.

  At this time, as shown in FIG. 7, in a state before the magnet portion 10a reaches substantially the same temperature as the boiling point of liquid nitrogen (−196 ° C.), the outer diameter R2a at the end portion 10c of the magnet portion 10a, and The outer diameter R3a at the end portion 10d on the X2 side is formed so as to be larger than the outer diameters R2 and R3 of the load-side rotating body 10 shown in FIG. Only a part of 10 a is inserted into the insertion hole 13 a of the holding part 13.

  Thereafter, the magnet portion 10a is cooled until it reaches a temperature substantially equal to the boiling point of liquid nitrogen (−196 ° C.), so that the outer diameters R2a and R3a of the magnet portion 10a are respectively on the load side shown in FIG. The magnet portion 10a is contracted until it has substantially the same size as the outer diameters R2 and R3 of the rotating body 10. As a result, as shown in FIG. 8, the magnet portion 10 a in a cooled state contracts by the tightening allowance, so that the tapered magnet portion 10 a has a hole diameter of the insertion hole 13 a of the tapered holding portion 13. It is inserted in the X2 direction from a large portion (X1 side end portion 13c) toward a small hole diameter portion (X2 side end portion 13d). At this time, the magnet portion 10a in the cooled state is easily inserted into the insertion hole 13a of the holding portion 13 in the cooled state only by applying a smaller force in the X2 direction than in the case of press-fitting without cooling. The

  And after the magnet part 10a is completely inserted in the holding | maintenance part 13, the holding | maintenance part 13 in which the magnet part 10a was inserted is taken out from the cooling container 104, and is returned to normal temperature. As a result, the contracted magnet portion 10a expands. Thereby, the magnet part 10a is fixed in the state closely_contact | adhered in the insertion hole 13a of the holding | maintenance part 13, and a cold fitting process is complete | finished.

  Then, after removing the fixing jig 102, as shown in FIG. 9, the cutting is performed so that the X1 side end portion 10c of the magnet portion 10a and the X1 side end portion 13c of the holding portion 13 are substantially flush with each other. Cut and polish at line C. Thereby, a part on the X1 side of the holding portion 13 is removed. Similarly, cutting and polishing are performed at the cutting line C so that the end portion 10d on the X2 side of the magnet portion 10a and the end portion 13d on the X2 side of the holding portion 13 are substantially flush with each other. Thereby, a part on the X2 side of the holding portion 13 is removed. As a result, the load side rotating body 10 is produced. Thereafter, as shown in FIG. 1, the load side portion 1 is produced by inserting and fixing the shaft portion 1 a in the insertion hole 11 b of the yoke 11.

  Then, separately prepared drive source side part 2 and isolation member 3 and load side part 1 are arranged as shown in FIGS. 1 and 2. Thereby, the magnetic coupling device 100 is manufactured.

  In the manufacturing method of the present embodiment, as described above, the magnet portion 10a is held in the contracted state due to cooling by being inserted and fixed in the insertion hole 13a of the holding portion 13 by a cooling fit process. Since the diameter of the insertion hole 13a of the holding part 13 is smaller than the outer diameter of the magnet part 10a, the tightening margin (the outer diameter of the magnet part 10a and the insertion hole of the holding part 13 can be Even in a state in which a difference from the hole diameter of 13a is ensured, the magnet portion 10a can be inserted into the holding portion 13 with a smaller force than press-fitting. Thereby, it can suppress that the holding | maintenance part 13 and the magnet part 10a are damaged.

  Further, in the manufacturing method of the present embodiment, in the cooling and fitting process, the outer diameter R2 on the X1 side and the outer diameter R3 on the X2 side of the magnet part 10a in the cooled state are respectively set in the insertion holes 13a of the holding part 13. By making the hole diameters R2 and R3 on the inner peripheral surface 13b substantially the same size, the tapered magnet portion 10a can be inserted into the insertion hole 13a of the tapered holding portion 13 so that both are securely adhered. it can.

  Moreover, in the manufacturing method of this embodiment, the length L2 of the holding | maintenance part 13 in the X direction is made larger than the length L1 of the magnet part 10a in the X direction. Then, after the cooling and fitting step, a part of the holding portion 13 on the X1 side is arranged so that the X1 side end portion 10c of the magnet portion 10a and the X1 side end portion 13c of the holding portion 13 are substantially flush with each other. At the same time, a part of the holding part 13 on the X2 side is removed so that the end part 10d on the X2 side of the magnet part 10a and the end part 13d on the X2 side of the holding part 13 are substantially flush with each other. Thereby, after inserting the magnet part 10a into the insertion hole 13a of the holding part 13 formed larger in the X direction (rotation axis direction), the magnet part 10a and the holding part 13 are removed by removing a part of the holding part 13. Unlike the case where the lengths in the X direction are adjusted in advance, the end portion 13c on the X1 side of the holding portion 13 and the end portion 10c on the X1 side of the magnet portion 10a can be made substantially flush with each other. The end portion 13d on the X2 side of the holding portion 13 and the end portion 10d on the X2 side of the magnet portion 10a can be made substantially flush with each other. As a result, since it can suppress that the holding | maintenance part 13 becomes longer than the magnet part 10a in a X direction, it can suppress that the magnetic coupling apparatus 100 enlarges in a X direction. Moreover, since it can suppress that the magnet part 10a becomes longer than the holding | maintenance part 13 in a X direction, the magnet part 10a can be fixed reliably by the holding | maintenance part 13. FIG.

  Further, in the manufacturing method of the present embodiment, the 36 magnets 12 are brought into close contact with the outer surface 11a of the yoke 11 by magnetic force without using an adhesive before the cooling and fitting process, so that the magnet portion 10a is brought into contact with the magnet portion 10a. The magnet 12 that is joined to the yoke 11 is connected to the holding portion 13 and the yoke 11 at a sufficient pressure (internal pressure) only when the magnet portion 10a expands and returns to its original size after the cooling and fitting process. It is sandwiched between and firmly held. That is, in the magnet portion 10a of the present embodiment, when inserting the magnet portion 10a into the holding portion 13, no large force acts on the magnet 12 of the magnet portion 10a. There is no need to consider heat shrinkage and low temperature durability of the adhesive in the fitting process. Therefore, the load side rotating body 10 can be easily manufactured.

(Example)
Next, an example of the load side rotating body 10 of the magnetic coupling device 100 described in the above embodiment will be described with reference to FIGS. 1, 4, 5, and 8.

In the load side rotating body 10 in this embodiment, as shown in FIG. 5, the length L1 of the magnet portion 10a in the X direction (rotational axis direction) is set to 63.0 mm. Moreover, the diameter R1a in the radial direction of the yoke 11 before the cooling fit was formed to be 125.25 mm. Further, the outer peripheral surface 10b of the magnet part 10a is inclined at an inclination angle α that satisfies α ≦ tan ⁻¹ (0.2 / 10) so that the outer diameter decreases from the X1 side toward the X2 side. Formed. Specifically, the thickness t1 at the end portion 10c on the X1 side of the magnet 12 was set to 5.075 mm, and the thickness t2 at the end portion 10d on the X2 side was set to 4.925 mm. As a result, the outer diameter R2a (= the outer diameter R1a of the yoke 11 + the thickness t1 × 2 of the magnet 12) at the end portion 10c on the X1 side of the magnet portion 10a becomes 135.400 mm, and the end on the X2 side of the magnet portion 10a. The outer diameter R3a (= the outer diameter R1a of the yoke 11 + the thickness t2 × 2 of the magnet 12) in the portion 10d is 135.100 mm.

Further, as shown in FIG. 4, β ≦ tan ⁻¹ (0.2 / 10) of the inner peripheral surface 13b of the insertion hole 13a of the holding portion 13 so that the hole diameter decreases from the X1 side toward the X2 side. ) So as to be inclined at an inclination angle β satisfying the above. That is, the inner peripheral surface 13b of the insertion hole 13a of the holding portion 13 is formed to have a taper angle corresponding to the outer peripheral surface 10b of the magnet portion 10a. Specifically, the hole diameter R2 at the end portion 13c on the X1 side of the holding portion 13 was set to 135.275 mm, and the hole diameter R3 at the end portion 13d on the X2 side was set to 134.975 mm. Further, the thickness t3 of the holding portion 13 was set to 2.0 mm, and the thickness was made constant along the X direction.

  That is, the hole diameter R2 (see FIG. 4) at the end portion 13c on the X1 side of the holding portion 13 is set as a tightening allowance of 0. The hole diameter R3 (see FIG. 4) at the end portion 13d on the X2 side of the holding portion 13 is made smaller than the outer diameter at the end portion 10d on the X2 side of the magnet portion 10a, while being made smaller by 125 mm (= 135.400-130.275). It was formed smaller than the diameter R3a (see FIG. 5) by 0.125 mm (= 135.100-134.975) as a tightening allowance.

  Then, by cooling the magnet portion 10a in the cooling and fitting process described above, the magnet portion 10a contracts until the outer diameters R2a and R3a of the magnet portion 10a become the same size as the outer diameters R2 and R3, respectively. I let you. That is, the magnet part 10a was contracted by 0.125 mm (tightening allowance) in the radial direction. Then, as shown in FIG. 8, the magnet portion 10a in the cooled state is inserted into the insertion hole 13a of the holding portion 13 in the cooled state from the side having the larger hole diameter (the end portion 13c on the X1 side). It was inserted in the X2 direction toward the small side (the end portion 13d on the X2 side).

  Thereafter, the holding unit 13 in which the magnet unit 10a was inserted was taken out of the cooling container 104 and returned to room temperature, and then the magnetic coupling device 100 shown in FIG. 1 was manufactured based on the above-described manufacturing method. And the load side rotary body 10 was rotated at the rotational speed of 20,000 times per minute. At this time, the 36 magnets 12 of the magnet portion 10a were sufficiently fixed by the holding portion 13 without moving. As a result, in the said Example, it is thought that sufficient pressure (internal pressure) is applied to the magnet part 10a by the holding | maintenance part 13, and the magnet part 10a can fully be fixed.

Here, the thickness t3 of the holding portion 13 will be considered. The thickness t3 of the holding unit 13 is t3> (r × ρm × tm × r × ω ² ) / (ε × Ec) on the condition that the pressure (internal pressure) by the holding unit 13 is larger than the centrifugal force acting on the magnet unit 10a. ) Is derived. In the above formula, t3 is the thickness of the holding portion 13, r is the average radius of the magnet portion 10a, ρm is the magnet density of the magnet 12, tm is the average thickness of the magnet 12, and ω is The angular velocity of the magnet portion 10 a (load-side rotating body 10), ε is the radial strain after the cooling and fitting process of the holding portion 13, and Ec is the longitudinal elastic modulus of the holding portion 13.

  Moreover, in this embodiment, the outer diameter of the outer peripheral surface 10b of the magnet part 10a and the hole diameter of the inner peripheral surface 13b of the insertion hole 13a of the holding part 13 are made the same size at the time of the cold fitting process. Therefore, the radial strain ε after the cooling and fitting process of the holding portion 13 in the above embodiment can be expressed by ε = α × ΔT. In the above formula, α is a linear expansion coefficient of the magnet portion 10a, and ΔT is a temperature difference during the cooling and fitting process.

Here, α can approximate the linear expansion coefficient of the magnet portion 10a with the linear expansion coefficient of the yoke 11 that occupies most of the magnet portion 10a. Therefore, if specific numerical values in the above embodiment are substituted, the magnet portion 10a Coefficient of linear expansion α = 11.7 × 10 ⁻⁶ (SS400 linear expansion coefficient), ΔT = 20 (room temperature) − (− 196) (boiling point of liquid nitrogen) = 216, and as a result, ε = 2. 53 × 10 ⁻³ .

Further, values other than ε in the above-described embodiments are the average radius r of the magnet portion 10a = 65 mm and the magnetic flux density ρm of the magnet 12 = 7.4 × 10 ⁻³ g / mm ³ (for a general neodymium magnet, respectively). Density), the average thickness tm of the magnet 12 is 5.0 mm, the angular velocity of the magnet portion 10 a is 2090 rad / s, and the longitudinal elastic modulus Ec of the holding portion 13 is 300 GPa.

  As a result, when t3 is obtained from the above equation, t3> 0.90 mm. That is, even if the safety factor is multiplied by 2, t3> 1.80 mm. That is, since the thickness t3 (2.0 mm) of the holding portion 13 in the above embodiment sufficiently satisfies the above formula, the pressure (internal pressure) by the holding portion 13 is sufficiently larger than the centrifugal force acting on the magnet portion 10a. Is possible.

  Further, by setting the thickness t3 of the holding portion 13 to 2.0 mm, the torque transmission rate can be improved by about 25% compared to the case where the thickness t3 of the holding portion 13 is 6.5 mm. That is, by reducing the thickness t3 of the holding portion 13, the magnet portion 10a can be brought closer to the load-side rotating body 10 and the drive source-side rotating body 20 that is magnetically coupled. It was confirmed that transmission of force (torque) with the drive source side rotating body 20 can be performed more efficiently.

  Note that the thickness t3 of the holding portion 13 is changed in accordance with the above-described formula when conditions such as the number of rotations of the load-side rotator 10 are changed. Even in such a case, in the present embodiment, the outer diameter of the outer peripheral surface 10b of the magnet portion 10a and the hole diameter of the inner peripheral surface 13b of the insertion hole 13a of the holding portion 13 are set in the cooling and fitting process. Since they can be matched, the thickness t3 of the holding portion 13 can be reduced.

  Moreover, in this embodiment, when the thickness t3 of the holding part 13 can be ensured large, it is possible to use a carbon fiber having a small tensile elastic modulus as the carbon fiber of CFRP that constitutes the holding part 13. Even when a material having a small tensile elastic modulus is used, it is possible to more reliably suppress damage to the holding portion 13 while sufficiently applying pressure (internal pressure) to the magnet portion 10a.

  The embodiments and examples disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments and examples but by the scope of claims for patent, and includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the said embodiment, although the taper shape of the outer peripheral surface 10b of the magnet part 10a was shown by forming the outer peripheral surface of the magnet 12 into a taper shape, this invention is not limited to this. For example, the outer peripheral surface 10b of the magnet portion 10a may be formed into a tapered shape by forming the outer surface of the yoke 11 into a tapered shape without forming the outer peripheral surface 10b of the magnet portion 10a into a tapered shape.

  Moreover, in the said embodiment, although the example using CFRP was shown as the holding | maintenance part 13, this invention is not limited to this. For example, instead of CFRP, glass fiber reinforced plastic (GFRP) composed of a base material made of a resin material such as an epoxy resin and a reinforcing material made of glass fiber may be used as the holding portion.

  In the above embodiment, the three N-pole magnets 112 and the three S-pole magnets 212 are arranged along the rotation axis A on the outer surface 11a of the yoke 11, and the six N-poles are arranged. Although the example in which the magnets 112 and the six S-pole magnets 212 are alternately arranged at equal angular intervals along the rotation direction B has been shown, the present invention is not limited to this. In this invention, you may comprise so that the magnet of a magnet part may consist of one. Moreover, you may comprise so that the magnet of a magnet part may consist of a plurality of ring-shaped magnets integrally formed along the rotation direction. In this case, the plurality of ring-shaped magnets are arranged side by side along the rotation axis direction. Moreover, you may comprise so that the magnet of a magnet part may consist of a some magnet integrally formed along the rotating shaft direction. In this case, the plurality of magnets are arranged side by side along the rotation direction.

  Moreover, in the said embodiment, although the yoke 11 showed the example which consists of SS400, this invention is not limited to this. In the present invention, the yoke is not particularly limited as long as it is a magnetic material. For example, the yoke may be SUS430.

  Moreover, in the said embodiment, although the example in which a magnet consists of a neodymium magnet was shown, this invention is not limited to this. For example, the magnet may be a ferrite magnet.

  Moreover, in the said embodiment, although the example formed so that the insertion hole 13a of the holding | maintenance part 13 might be penetrated to a X direction was shown, this invention is not limited to this. In the present invention, the insertion hole of the holding part may not be formed so as to penetrate, for example, the holding part has an opening on the X1 side in FIG. 1 and a bottom on the X2 side in FIG. You may form in a cup shape (bottom cylindrical shape).

  In the above embodiment, the end portion 10c on the X1 side of the magnet portion 10a and the end portion 13c on the X1 side of the holding portion 13 are formed to be substantially flush with each other, and the end portion on the X2 side of the magnet portion 10a. Although the example which formed 10d and the edge part 10d by the side of X2 of the holding | maintenance part 13 so that it might become substantially flush was shown, this invention is not limited to this. In the present invention, the end of the magnet part and the end of the holding part may not be flush with each other.

  Moreover, although the drive source side rotation body 20 (2nd coupling body) showed the example which can rotate in the said embodiment, this invention is not limited to this. In the present invention, it is only necessary that the load side rotating body formed with the taper shape is rotatable, and the second coupling body does not need to rotate.

  Moreover, in the said embodiment, although the example in which the load side rotary body 10 and the isolation member 3 are arrange | positioned inside the cylindrical part 21 of the drive source side rotary body 20 was shown, this invention is not limited to this. In the present invention, the load-side rotator and the drive source-side rotator may both be formed in a disc shape and arranged so as to face each other in the rotation axis direction. At this time, it is preferable to provide a tapered magnet portion and a holding portion on both the load side rotating body and the drive source side rotating body.

10 Load-side rotating body (first coupling body)
DESCRIPTION OF SYMBOLS 10a Magnet part 10b Outer peripheral surface 11 Yoke 11a Outer surface 12 Magnet 13 Holding part 13a Insertion hole 13b Inner peripheral surface 20 Drive source side rotary body (2nd coupling body)
100 Magnetic coupling device

Claims (10)

A magnet portion having a magnet, and an insertion hole into which the magnet portion is inserted, and one holding portion capable of fixing the magnet by applying pressure to the magnet portion inserted into the insertion hole. A rotatable first coupling body comprising:
A second coupling body that is disposed in a non-contact state with respect to the first coupling body and magnetically couples with the first coupling body;
The holding part is made of a material that is less likely to shrink by cooling than the magnet part,
The inner peripheral surface of the insertion hole of the holding part is formed in a tapered shape so that the hole diameter decreases from one end side to the other end side in the rotation axis direction of the first coupling body. And
The outer peripheral surface of the magnet portion has an outer diameter that decreases from one end side to the other end side in the rotation axis direction so as to correspond to the tapered shape of the inner peripheral surface of the insertion hole. It is formed in a tapered shape,
The magnetic coupling device, wherein the magnet portion is inserted and fixed to the holding portion by a cold fitting process. The inclination angle θ in the tapered shape of the inner peripheral surface of the insertion hole of the holding portion and the tapered shape of the outer peripheral surface of the magnet portion satisfies 0 <θ ≦ tan ⁻¹ (0.2 / 10). The magnetic coupling device according to claim 1.   3. The magnetic coupling device according to claim 1, wherein a thickness of the holding unit is set to a thickness such that a pressure by the holding unit is larger than a centrifugal force acting on the magnet unit.   The magnetic coupling device according to claim 1, wherein a thickness of the holding portion is configured to be constant along the rotation axis direction.   The magnetic coupling device according to claim 1, wherein the holding portion is made of a nonmagnetic carbon fiber reinforced plastic.   6. The magnetic coupling device according to claim 1, wherein the magnet portion includes a columnar yoke and a plurality of the magnets that are in close contact with the outer surface of the yoke with a space therebetween. A rotatable first cup including a magnet part having a magnet and a holding part that has an insertion hole into which the magnet part is inserted and that can apply pressure to the magnet part to fix the magnet. A ring body, and a second coupling body that is arranged in a non-contact state with respect to the first coupling body and magnetically couples with the first coupling body, wherein the holding portion is Is a method of manufacturing a magnetic coupling device made of a material that is difficult to shrink by cooling,
Forming the inner peripheral surface of the insertion hole of the holding portion into a tapered shape so that the hole diameter decreases from one end side to the other end side in the rotation axis direction of the first coupling body; When,
An outer diameter of the outer peripheral surface of the magnet portion is reduced from one end side to the other end side in the rotation axis direction so as to correspond to the tapered shape of the inner peripheral surface of the insertion hole. Forming into a tapered shape;
A method of manufacturing a magnetic coupling device, comprising: a cooling and fitting step of inserting the magnet portion in a cooled state into the holding portion in a cooled state.   In the cooling and fitting step, the outer diameter of the magnet portion in a cooled state is substantially the same as the hole diameter of the inner peripheral surface of the insertion hole of the holding portion in a cooled state. The manufacturing method of the magnetic coupling apparatus of Claim 7 including the process of inserting the said magnet part in the said holding | maintenance part. The step of forming the holding portion includes a step of forming the holding portion so that the length in the rotation axis direction of the holding portion is larger than the length of the magnet portion in the rotation axis direction,
After the cooling and fitting step, the one end portion of the holding portion in the rotation axis direction and the one end portion of the magnet portion in the rotation axis direction are substantially flush, and the rotation axis of the holding portion. 9. The method according to claim 7, further comprising a step of removing a part of the holding portion so that the other end portion in the direction and the other end portion in the rotation axis direction of the magnet portion are substantially flush with each other. A method of manufacturing a magnetic coupling device.   10. The method according to claim 7, further comprising a step of bringing the plurality of magnets of the magnet portion into close contact with a cylindrical yoke by a magnetic force without using an adhesive before the cooling and fitting step. A method for manufacturing the magnetic coupling device according to claim 1.

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