JP2004328924A - Method for manufacturing eddy current type reduction gear unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an eddy current type reduction gear unit which prevents an outside magnet ring and a casing from being deformed. <P>SOLUTION: This eddy current type reduction gear unit 1 includes a casing 5 disposed oppositely to a brake rotor 3 and mounted at a fixed side, an output magnet ring 18 mounted in the casing 5 and having a plurality of magnets 16 disposed at an interval in a circumferential direction, and an inside magnet ring 7 having a plurality of magnets 10 disposed at the inside of the outside magnet ring 18 and disposed at an interval in the circumferential direction. The method for manufacturing the eddy current type reduction gear unit 1 includes the steps of mounting the outside magnet ring 18 in the casing 5; forming a magnetic circuit 21 between the magnet 16 of the outside magnet ring 18 and a ferromagnetic member 20, by mounting the ferromagnetic member 20 on the outer peripheral side of the outside magnet ring 18 prior to the insertion of the inside magnet ring 7 into the inside of the outside magnet ring 18; inserting the inside magnet ring 7 to the inside of the outside magnet ring 18 mounted with the ferromagnetic member 20; and thereafter removing the ferromagnetic member 20 from the outside magnet ring 18. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing an eddy current type reduction gear.
[0002]
[Prior art]
The inventor has previously developed an eddy current type speed reducer as shown in FIGS.
[0003]
The eddy current type reduction gear 1 is disposed on a drum-shaped braking rotor 3 mounted on a rotating shaft 2 such as a propeller shaft of a vehicle, and is disposed radially inside the braking rotor 3 and mounted on a fixed side such as a transmission case. A magnetic force is supplied from the stator 4 to the rotor 3 to generate an eddy current in the rotor 3 to decelerate the braking of the rotating shaft 2 and shield the magnetism in the stator 4. This is to release the deceleration braking.
[0004]
The stator 4 includes a hollow casing 5 supported on a fixed side, an inner magnet ring 7 rotatably housed in the casing 5 via a bush 6, and an actuator 8 for rotating the inner magnet ring 7 ( Fluid cylinder, etc.). As shown in FIGS. 14 and 15, the inner magnet ring 7 includes a support ring 9 made of a non-magnetic material (such as austenitic stainless steel) and a plurality of permanent magnets attached to the support ring 9 at predetermined intervals in the circumferential direction. It has a magnet 10 and a magnetic member 11 (a laminated body such as an electromagnetic steel plate or an iron block material) interposed between the permanent magnets 10. Each of the permanent magnets 10 has magnetic pole faces on both end faces in the circumferential direction, and the magnetic poles facing in the circumferential direction are set to be the same.
[0005]
An outer magnet ring 18 similar to the inner magnet ring 7 is integrally attached to the casing 5 at a position between the inner magnet ring 7 and the rotor 3. That is, the outer magnet ring 18 is attached at a predetermined interval in the circumferential direction, and a plurality of permanent magnets 16 in which the magnetic poles facing in the circumferential direction are set to the same polarity, and a magnetic material provided between the permanent magnets 16. And a member 17 (a laminated body such as an electromagnetic steel sheet or an iron block material). The pitches and perimeters of the permanent magnets 10 and 16 and the magnetic members 11 and 17 of the inner and outer magnet rings 7 and 18 are set substantially equal to each other.
[0006]
When the deceleration braking of the eddy current type reduction gear is turned off, the inner magnet ring 7 is rotated by the cylinder 8 so that the respective permanent magnets 10 and the respective outer magnet rings 18 of the inner magnet ring 7 are rotated as shown in FIG. The phase is set to be opposite to the permanent magnet 16 at a different magnetic pole. Then, a short-circuited magnetic circuit 31 is formed between the permanent magnet 10 and the magnetic member 11 of the inner magnet ring 7 and the permanent magnet 16 and the magnetic member 17 of the outer magnet ring 18. Therefore, no magnetism acts on the braking rotor 3 and no eddy current is generated. That is, deceleration braking does not occur.
[0007]
On the other hand, when turning on the deceleration braking, the inner magnet ring 7 is rotated so that each permanent magnet 10 of the inner magnet ring 7 and each permanent magnet 16 of the outer magnet ring 18 have the same polarity as shown in FIG. Make them face each other. Then, magnetic circuits 32 and 33 are formed between the permanent magnets 10 and 16 and the magnetic members 11 and 17 of the inner and outer magnet rings 7 and 18 and the braking rotor 3. Therefore, an eddy current is generated in the braking rotor 3, and the rotating shaft 2 is decelerated and braked.
[0008]
In the eddy current type speed reducer 1 described above, when the deceleration braking is on, strong magnetism acts on the braking rotor 3 by the two rows of permanent magnets provided in the radial direction, so that a high braking force can be obtained.
[0009]
By the way, in the eddy current type reduction gear 1, as shown in FIG. 13, the casing 5 usually has a structure divided into two parts in the axial direction. One side in the axial direction of the outer magnet ring 18 provided with the magnetized permanent magnets 16 is fixed to the side of one of the members 5b. Next, the inner magnet ring 7 having the magnetized permanent magnet 10 is inserted into the outer magnet ring 18 in the radial direction using a jig.
[0010]
Then, the other side 5a (including the actuator 8) of the split casing 5 is attached to the other side of the outer magnet ring 18 and the side of the split casing 5b. As a result, the inner magnet ring 7 is accommodated in the casing 5, and the stator 4 is assembled.
[0011]
The eddy current type reduction gear 1 is manufactured by attaching the stator 4 to a fixed side such as a transmission case and fixing the brake rotor 3 to the rotating shaft 2 while positioning the brake rotor 3 on the outer periphery of the stator 4.
[0012]
[Patent Document 1]
Japanese Patent Publication No. 6-83571
[Problems to be solved by the invention]
However, in this manufacturing method, when the inner magnet ring 7 is inserted inside the outer magnet ring 18, the outer magnet ring 18 and the casing 5b may be deformed.
[0014]
To explain the reason, for example, as shown in FIG. 16, each of the permanent magnets 10 of the inner magnet ring 7 and each of the permanent magnets 16 of the outer magnet ring 18 have the same polarity and oppose each other. When inserted into the ring 18, the outer magnet ring 18 is deformed radially outward due to the repulsive force of the permanent magnet 10 of the inner magnet ring 7 and the permanent magnet 16 of the outer magnet ring 18. Further, the outer magnet ring 18 may be rotated by the repulsive force of the permanent magnets 10 and 16, and the casing 5b may be twisted.
[0015]
On the other hand, as shown in FIG. 17, when the inner magnet ring 7 is inserted in a phase in which the respective permanent magnets 10 of the inner magnet ring 7 and the respective permanent magnets 16 of the outer magnet ring 18 are opposite in phase, the inner magnet ring 7 The attraction force between the permanent magnet 10 and the permanent magnet 16 of the outer magnet ring 18 causes the outer magnet ring 18 to be deformed radially inward or the outer magnet ring 18 and the inner magnet ring 7 to be attracted.
[0016]
When the inner magnet ring 7 is inserted into the outer magnet ring 18, the outer magnet ring 18 is in a state of being cantilevered by the split casing 5 b, and thus has a low rigidity and such deformation is likely to occur.
[0017]
Then, an object of the present invention is to solve the above-mentioned problems and to provide a method of manufacturing an eddy current type speed reducer in which deformation of an outer magnet ring and a casing is prevented.
[0018]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a casing, which is disposed to face a braking rotor attached to a rotating shaft, and which is attached to a fixed side, and which is attached to the casing, and is arranged at intervals in a circumferential direction. Eddy current type comprising an outer magnet ring having a plurality of magnets, and an inner magnet ring having a plurality of magnets disposed radially inside the outer magnet ring and provided at intervals in a circumferential direction. A method for manufacturing a reduction gear transmission, wherein after attaching the outer magnet ring to the casing, prior to inserting the inner magnet ring inside the outer magnet ring, the outer magnet ring is formed of a ferromagnetic material. A magnetic member is attached to form a magnetic circuit between the magnet of the outer magnet ring and the ferromagnetic member, and the inner magnet ring is inserted inside the outer magnet ring to which the ferromagnetic member is attached. And then on The ferromagnetic member is obtained as removed from the outer magnet ring.
[0019]
Here, when inserting the inner magnet ring inside the outer magnet ring, the inner magnet ring is inserted with the same polarity as the magnet of the outer magnet ring and opposed to the outer magnet ring, and the outer magnet ring is inserted. When a magnetic circuit is formed between the magnet of the inner magnet ring and the ferromagnetic member, and the ferromagnetic member is removed, the outer magnet ring and / or the inner magnet ring are rotated to remove the outer magnetic ring. The magnets of the magnet ring and the magnets of the inner magnet ring may be opposed to each other with different polarities, and a magnetic circuit may be formed between the magnets of the outer magnet ring and the magnets of the inner magnet ring.
[0020]
Further, the outer magnet ring is formed of the plurality of magnets and a magnetic member interposed between the respective magnets and made of a laminated body such as an electromagnetic steel plate, and the outer surface of the outer magnet ring and the ferromagnetic material. Opposite grooves are formed on the inner surface side of the body member, and the ferromagnetic member is attached to the outer peripheral side of the outer magnet ring. Then, a key member is inserted into the opposing groove, and then the inner magnet is inserted. The insertion of the ring and the removal of the ferromagnetic member may be performed.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[0022]
The present embodiment is a method for manufacturing the eddy current type speed reducer 1 as shown in FIGS. 13 to 15, and the configuration of the eddy current type speed reducer 1 has been described in the section of “Prior Art” and will not be described. .
[0023]
A method of manufacturing the eddy current type reduction gear 1 according to the present embodiment will be described with reference to FIGS.
[0024]
First, as shown in FIG. 1, an outer side provided with a magnetized permanent magnet 16 is provided on one side of a casing 5 (here, a casing 5 b facing the actuator 8) which is divided into two in the axial direction. One side of the magnet ring 18 in the axial direction is attached using bolts or the like.
[0025]
Next, the inner magnet ring 7 is inserted radially inward of the outer magnet ring 18. Prior to this operation, as shown in FIG. (Magnetic member) 20 is fitted. The ring body 20 is made of a ferromagnetic material such as steel or a low carbon material, and is fitted so that the inner peripheral surface thereof contacts the outer peripheral surface of the outer magnet ring 18.
[0026]
Since the ring body 20 is a ferromagnetic substance, when the ring body 20 is fitted to the outer magnet ring 18, as shown in FIG. Thus, the magnetic circuit 21 is formed, and the ring body 20 is attracted to the outer magnet ring 18.
[0027]
In this state, as shown in FIG. 4, the inner magnet ring 7 and the bush 6 are inserted into the casing 5b while being centered using a jig. At this time, as shown in FIG. 5, each permanent magnet 10 is inserted into the inner magnet ring 7 at the same polarity and opposite phase as the respective permanent magnets 16 of the outer magnet ring 18 (when braking is on). As a result, a magnetic circuit 22 is formed by the permanent magnet 10 among the permanent magnet 10, the magnetic member 11, the magnetic member 17, and the ring body 20.
[0028]
As described above, when the inner magnet ring 7 is inserted into the outer magnet ring 18, most of the magnetic flux of the permanent magnet 16 of the outer magnet ring 18 flows to the ring body 20 and the magnetic flux of the permanent magnet 10 of the inner magnet ring 7. Flows to the ring body 20. Therefore, little or no repulsive force is generated between the permanent magnet 16 of the outer magnet ring 18 and the permanent magnet 10 of the inner magnet ring 7. Therefore, a force that deforms the outer magnet ring 18 and the casing 5b does not act.
[0029]
Next, the outer magnet ring 18 and / or the inner magnet ring 7 are rotated by a jig or the like, so that each permanent magnet 10 of the inner magnet ring 7 and each permanent magnet 16 of the outer magnet ring 18 are rotated as shown in FIG. Are positioned so as to be opposite to each other (state when braking is off). Then, the magnetic flux of the permanent magnet 16 of the outer magnet ring 18 flows to the permanent magnet 10 of the inner magnet ring 7, and the magnetic flux of the permanent magnet 10 of the inner magnet ring 7 flows to the permanent magnet 16 of the outer magnet ring 18, A short-circuited magnetic circuit 23 is formed between the magnet 16, the magnetic member 17, the permanent magnet 10, and the magnetic member 11. Thereby, the magnetic flux from the permanent magnets 10 and 16 hardly acts on the ring body 20. Therefore, the magnetic force that has attracted the ring body 20 to the outer magnet ring 18 is eliminated. Therefore, the ring body 20 is removed from the outer magnet ring 18 as shown in FIG.
[0030]
Next, as shown in FIG. 8, the other 5a (actuator 8 side) of the two-piece casing 5 is fixed to the other side in the axial direction of the outer magnet ring 18 and the casing 5b with bolts or the like. Thus, the stator 4 is formed. The stator 4 is mounted on a fixed side such as a transmission case, and the braking rotor 3 is positioned on the outer periphery of the stator 4 and mounted on the rotating shaft 2, whereby the eddy current type reduction gear 1 as shown in FIG. 13 is manufactured. .
[0031]
As described above, according to the eddy current type reduction gear manufacturing method of the present embodiment, when the inner magnet ring 7 is inserted into the outer magnet ring 18, the magnetic flux of the permanent magnet 16 of the outer magnet ring 18 is Since it flows to the side, no magnetic force is generated between the permanent magnet 16 of the outer magnet ring 18 and the permanent magnet 10 of the inner magnet ring 7 to deform the outer magnet ring 18 and the casing 5b. Therefore, the outer magnet ring 18 and the casing 5b are not deformed.
[0032]
In the above embodiment, the outer magnet ring 18 is attached to the casing 5b, and then the ring body 20 is fitted to the outer periphery of the outer magnet ring 18. However, the ring body 20 is fitted to the outer magnet ring 18 in advance. It may be attached to the casing 5b in that state.
[0033]
After inserting the inner magnet ring 7 inside the outer magnet ring 18, the casing 5 a and the actuator 8 may be attached, and the inner magnet ring 7 may be rotated by the actuator 8 to remove the ring body 20. .
[0034]
The present invention contemplates various modifications.
[0035]
For example, the inner circumference of the ring body 20 is formed slightly larger than the outer circumference of the outer magnet ring 18, and a shim (spacer) is interposed between the outer magnet ring 18 and the ring body 20 so that the ring body 20 and the outer magnet ring A substantially uniform air gap (for example, about 0.4 mm to 0.8 mm) may be formed in the circumferential direction between the air gap and the air gap 18. By doing so, the frictional force between the outer magnet ring 18 and the ring body 20 can be eliminated, so that the work of fitting and removing the ring body 20 can be easily performed. In this case, the shim may be made of a non-magnetic material. As long as the air gap is not extremely large, the above-described magnetic circuit 21 (see FIG. 3) can be formed, and the above effects can be obtained.
[0036]
Further, as shown in FIG. 9, a concave groove 25 may be formed in a portion of the inner peripheral surface of the ring body 20 facing the magnetic member 17 of the outer magnet ring 18. Also in this case, since the contact area between the ring body 20 and the outer magnet ring 18 can be reduced, the frictional force can be reduced, and the work of fitting and removing the ring body 20 can be easily performed.
[0037]
Further, as shown in FIG. 10, grooves 26 and 27 facing each other are formed on the inner peripheral surface of the ring body 20 and the outer peripheral surface of the outer magnet ring 18 (more specifically, the outer peripheral surface of the magnetic member 17). After the body 20 is fitted to the outer magnet ring 18, the key member 28 may be inserted into the grooves 26, 27. In this case, since the ring body 20 and the outer magnet ring 18 cannot be rotated relative to each other, the torsion of the outer magnet ring 18 and the casing 5b can be more reliably prevented. Note that a plurality of grooves 26, 27 and key member 28 may be formed in the circumferential direction, but the effect can be obtained if at least one is formed. Alternatively, the key member 28 may be inserted in the groove 26 of the ring body 20 in advance, and the ring body 20 may be fitted to the outer magnet ring 18 in this state.
[0038]
In FIG. 10, the groove 27 may be formed only on the outer peripheral surface of the outer magnet ring 18, and a convex portion corresponding to the key member 28 may be formed on the inner peripheral surface of the ring body 20.
[0039]
Further, as shown in FIG. 11, in an eddy current type reduction gear of a type in which a waterproof thin plate 30 (for example, an iron plate) is wound around the outer magnet ring 18, the thin plate 30 and the outer magnet ring 18 are formed in the same manner as described above. May be formed.
[0040]
The grooves 26 and 27 do not necessarily need to be formed over the entire area of the ring body 20 and the outer magnet ring 18 in the axial direction, but may be formed partially at an intermediate portion in the axial direction.
[0041]
Furthermore, as shown in FIG. 12, the present invention can be applied to a method of manufacturing an eddy current type reduction gear of a type in which each permanent magnet 10 of the inner magnet ring 7 has magnetic poles at both ends in the radial direction. FIG. 12 shows a state where the permanent magnets 10 of the inner magnet ring 7 and the permanent magnets 16 of the outer magnet ring 18 face each other with the same polarity. Similarly, the present invention can be applied to an eddy current type speed reducer in which the permanent magnets 16 of the outer magnet ring 18 have magnetic poles at both ends in the radial direction.
[0042]
Further, the present invention can be applied to an eddy current type speed reducer in which the outer magnet ring 18 is rotated by an actuator.
[0043]
Further, the ferromagnetic member does not necessarily have to be ring-shaped, but may have a shape divided in the circumferential direction.
[0044]
【The invention's effect】
In short, according to the present invention, an excellent effect that an eddy current type reduction gear can be easily manufactured is exhibited.
[Brief description of the drawings]
FIG. 1 is a partial side sectional view illustrating a method for manufacturing an eddy current type reduction gear according to an embodiment of the present invention.
FIG. 2 is a partial side sectional view illustrating a method for manufacturing an eddy current type reduction gear according to an embodiment of the present invention.
FIG. 3 is a partial front sectional view illustrating a method for manufacturing the eddy current type reduction gear according to one embodiment of the present invention.
FIG. 4 is a partial side sectional view illustrating a method for manufacturing an eddy current type reduction gear according to an embodiment of the present invention.
FIG. 5 is a partial front sectional view illustrating a method for manufacturing the eddy current type reduction gear according to the embodiment of the present invention.
FIG. 6 is a partial front sectional view illustrating a method for manufacturing the eddy current type reduction gear according to the embodiment of the present invention.
FIG. 7 is a partial side sectional view illustrating a method for manufacturing the eddy current type reduction gear according to one embodiment of the present invention.
FIG. 8 is a partial side sectional view illustrating a method for manufacturing an eddy current type reduction gear according to an embodiment of the present invention.
FIG. 9 is a partial front sectional view illustrating a method for manufacturing an eddy current type reduction gear transmission according to another embodiment of the present invention.
FIG. 10 is a partial front sectional view for explaining a method of manufacturing an eddy current type reduction gear according to another embodiment of the present invention.
FIG. 11 is a partial front sectional view illustrating a method for manufacturing an eddy current type reduction gear according to another embodiment of the present invention.
FIG. 12 is a partial front sectional view for explaining a method of manufacturing an eddy current type reduction gear according to another embodiment of the present invention.
FIG. 13 is a partial side sectional view of an eddy current type speed reducer developed earlier by the present inventors.
FIG. 14 is a partial front sectional view of the eddy current type reduction gear transmission of FIG. 13;
FIG. 15 is a partial front sectional view of the eddy current type speed reducer of FIG. 13;
FIG. 16 is a diagram illustrating the reason why the outer magnet ring and the casing are deformed.
FIG. 17 is a diagram illustrating the reason why the outer magnet ring and the casing are deformed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Eddy current type reduction gear 2 Rotation shaft 3 Braking rotor 5 Casing 7 Inner magnet ring 10, 16 Permanent magnet 18 Outer magnet ring 20 Ring body (ferromagnetic member)

Claims (3)

A casing disposed opposite to the braking rotor attached to the rotating shaft and attached to the fixed side, and an outer magnet ring attached to the casing and provided with a plurality of magnets arranged at intervals in the circumferential direction; A method for manufacturing an eddy current type speed reducer, comprising: an inner magnet ring having a plurality of magnets disposed radially inward of the outer magnet ring and provided at intervals in a circumferential direction,
After the outer magnet ring is attached to the casing, prior to inserting the inner magnet ring inside the outer magnet ring, a ferromagnetic member is attached to the outer peripheral side of the outer magnet ring to form the outer magnet ring. A magnetic circuit is formed between the magnet and the ferromagnetic member, and the inner magnet ring is inserted inside the outer magnet ring to which the ferromagnetic member is attached. A method for manufacturing an eddy current type speed reducer, wherein the speed reducer is detached from a magnet ring. When the inner magnet ring is inserted inside the outer magnet ring, the inner magnet ring is inserted in a phase in which the magnet has the same polarity as the magnet of the outer magnet ring and faces the same.
2. The magnet according to claim 1, wherein when the ferromagnetic member is removed, the outer magnet ring and / or the inner magnet ring are rotated so that the magnets of the outer magnet ring and the magnets of the inner magnet ring have opposite polarities. Manufacturing method of eddy current type reduction gear. The outer magnet ring includes a plurality of magnets, and a magnetic member interposed between the magnets and made of a laminated body such as an electromagnetic steel plate. The outer surface of the outer magnet ring and the inner surface of the ferromagnetic member are provided. On each side, grooves facing each other are formed, and after attaching the ferromagnetic member to the outer peripheral side of the outer magnet ring, a key member is inserted into the opposed groove. 3. The method according to claim 1, wherein the ferromagnetic member is removed.

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