JP2002233131A - Eddy current reduction gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bind permanent magnets in the three directions of the radius, circumference, and axis of a support ring as much as possible and fix the magnets with ease at low cost, taking into account the difference in the coefficients of a thermal expansion between the permanent magnets and the support ring. SOLUTION: With respect to an eddy current reduction gear, protruded edge portions 2Aa and 2Ab are formed on the edge portions of the support ring 2 by protruding both the edge portions of the support ring 2 in the axial direction, and recessed or projected engaging portions 2A are formed on the inside face wherein both the protruded edge portions 2Aa and 2Ab oppose each other. Protruded or recessed engaging portions 1A which are to be engaged with the recessed or projected engaging portions 2A on the support ring 2 are formed on both the side faces of permanent magnets 1a in the axial direction, with side faces opposite to both the projected edge portions 2Aa and 2Ab on the support ring 2. When the permanent magnet 1 is installed on the support ring 2, the protruded edge portions 2Ab on at least one side is pressed from the direction of the axis of the support ring 2, and further, the engaging portions 2A and 1A on the support ring 2 and the permanent magnet 1 are engaged with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention makes it possible to eliminate the need for high-precision machining of permanent magnets and to reduce the number of members required for mounting, taking into account the difference in the coefficient of thermal expansion between the permanent magnet and the support ring. An eddy current type reduction gear having a mounting structure in which a permanent magnet can be fixed to a support ring while restraining movement of the support ring in three directions of a radial direction, a circumferential direction, and an axial direction as much as possible. It is about.

[0002]

2. Description of the Related Art An eddy current type speed reducer includes a group of ferromagnetic switch plates evenly arranged between non-magnetic supports on the inner peripheral side of a drum, and a group of ferromagnetic switch plates facing the drum in the circumferential direction. And a support ring of a ferromagnetic material having a group of permanent magnets in which N poles and S poles are alternately and uniformly arranged along the support plate. The support ring is moved to a position where the permanent magnet is magnetically opposed to the switch plate. By turning with respect to the group, an eddy current is generated and deceleration is performed.

[0003] In the eddy current type speed reducer having the above-mentioned structure, in order to fix each of the permanent magnets to the support ring,
The following conditions must be satisfied. That is, in the eddy current type speed reducer, the permanent magnet is mounted on the support ring by (1) the radial direction of the support ring, (2) the circumferential direction of the support ring, and (3)
Unless the support ring is fixed so as to restrain the movement in the three axial directions, a predetermined braking torque cannot be obtained due to the displacement of the permanent magnet.

[0004] In the eddy current type reduction gear, both the permanent magnet and the support ring become hot during braking.
Since the coefficient of thermal expansion in the direction perpendicular to the direction of the magnetic flux of the permanent magnet, that is, in the above-mentioned circumferential and axial directions is extremely smaller than that of the support ring made of a steel material, the support ring thermally expands due to a rise in temperature. Since the permanent magnet arranged on the outer peripheral side of the support ring hardly thermally expands, for example, when the permanent magnet is restrained on the entire surface of the support ring, for example, when the permanent magnet is bonded to the support ring with an adhesive. However, there is a problem that a large distortion occurs in the adhesive layer due to the repetition of the braking ON / OFF, and the permanent magnet eventually peels off.

[0005] Further, in order to fix the permanent magnet to the support ring, for example, an engaging step is formed in the entire region of both ends in the circumferential direction of the support ring in the permanent magnet. A structure has been proposed in which a mounting bracket is interposed between the permanent magnets, and the mounting bracket is mounted with bolts or the like from the radial outside of the support ring. There is a problem in that a gap is formed in the engagement surface between the portion and the mounting bracket, and the holding force is reduced to cause looseness.

In consideration of the above problems, a structure for attaching a permanent magnet to a support ring is disclosed in, for example,
No. 74185 discloses that the permanent magnet is provided with an engaging step at all circumferential ends thereof, while the support ring is provided at both axial edges to restrain the permanent magnet from moving in the axial direction. Has been proposed.

According to the above, in order to mount the permanent magnet on the support ring, the mounting bracket is interposed so as to be engaged with the engaging step between the permanent magnets arranged in the circumferential direction.
This is performed by interposing a synthetic resin sheet as a cushioning material on the contact surface between the engaging step portion and the mounting member, and mounting the mounting bracket to the support ring from outside in the radial direction of the support ring with bolts or the like.

For example, in Japanese Patent Application Laid-Open No. 9-172770, a permanent magnet is provided with an engaging step at a part of both ends in a circumferential direction.
When mounting the permanent magnet on the support ring, a mounting bracket is interposed so as to be engaged with an engagement step between the permanent magnets arranged in the circumferential direction, and the mounting bracket is axially or radially outside the support ring. A structure in which bolting is performed at two points arranged in a circumferential direction is disclosed.

[0009]

SUMMARY OF THE INVENTION
No. 185 and Japanese Patent Application Laid-Open No. Hei 9-172770 disclose a structure in which engaging step portions at both ends in the circumferential direction of the permanent magnet are provided.
Since the mounting bracket was engaged while pressing the permanent magnet from the radial outside of the support ring, in order to restrict the movement of the permanent magnet, especially in the circumferential direction, the mounting bracket and the permanent magnet were The engagement surface needs to be processed with extremely high precision in consideration of the above-mentioned change of the support ring.

[0010] Extremely accurate machining of a permanent magnet requires a great deal of labor and time, resulting in a large production cost. In Japanese Utility Model Laid-Open No. 3-74185, a synthetic resin sheet is interposed on the engagement surface as a cushioning material instead of requiring high processing accuracy of the permanent magnet. In this case, a synthetic resin sheet that can withstand high temperatures is used. The cost increases as much as necessary.

Further, when the structure disclosed in Japanese Utility Model Laid-Open No. 3-74185 is adopted in an eddy current type speed reducer of a single-row turning type,
Since the support ring and the permanent magnet become longer in the axial direction, the force required to restrain the movement in the circumferential direction also increases, and when trying to restrain such a large permanent magnet in the circumferential direction,
A more reliable mounting structure is required, which complicates the structure, requires more mounting members, or requires high-precision machining of the permanent magnet.

That is, in order to mount the permanent magnet and the support ring of the eddy current type speed reducer, the above-mentioned (1) to (1) are simply used.
In addition to fixing to satisfy only condition (3),
In consideration of the difference in thermal expansion between the permanent magnet and the support ring, and without processing the permanent magnet with high precision, it has been desired to attach the permanent magnet with a small number of attachment members. Was.

The present invention has been made to solve the above problems, and does not require high-precision machining of the permanent magnet in consideration of the difference in the coefficient of thermal expansion between the permanent magnet and the support ring. Having a mounting structure capable of fixing the permanent magnet to the support ring while restraining the permanent magnet as much as possible in the three directions of the radial direction, the circumferential direction, and the axial direction of the support ring. An object of the present invention is to provide a current-type speed reducer.

[0014]

In order to achieve the above object, an eddy current type speed reducer according to the present invention comprises:
Along with forming both protruding edges in which both axial edges protrude in the radial direction, a concave or convex fitting portion is provided on the inner surface facing the both protruding edges, while the permanent magnet has Fitting portions are provided on both side surfaces in the axial direction opposed to both protruding edges of the support ring, and a fitting portion is provided on the peripheral surface of the support ring at a position where the permanent magnet is disposed, and both outer peripheral axial directions are provided. The edges protrude in the radial direction to form both protruding edges, while the permanent magnet is provided with engaging portions on both axial sides facing the protruding edges of the support ring, and the support ring At least one axial surface of the support ring is provided with a fitting portion on the surface disposed on the support ring, and protrudes radially from the peripheral surface of the support ring, at a position where the permanent magnet of the protruded side wall is sandwiched in the circumferential direction. A projecting portion is formed by projecting the projecting side wall to the center of the peripheral surface width of the support ring. Was a side plate provided, on the other hand, the permanent magnet is obtained by forming a notch that engages a protrusion of the side plates on the top.

In the eddy current speed reducer of the present invention, when the permanent magnet is attached to the support ring, the permanent magnet is pressed from at least one protruding edge of the support ring. By doing so, even if there is a difference in the coefficient of thermal expansion between the permanent magnet and the support ring, the permanent magnet can be securely fixed in the radial direction, circumferential direction, and axial direction of the support ring with a small number of members, Since the permanent magnet is pressed from the axial direction of the support ring, it is not necessary to consider a large change in the circumferential direction and the axial direction of the support ring, and it is not necessary to process the permanent magnet with high precision.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An eddy current type speed reducer according to a first aspect of the present invention is configured such that a permanent magnet uniformly arranged on a peripheral surface of a ferromagnetic support ring is turned from a non-braking position to a braking position. In the eddy current speed reducer for switching the braking on and off, the support ring is formed with two projecting edges in which both axial edges project in the radial direction, and the two projecting edges are opposed to each other. A concave or convex fitting portion is provided on the inner surface, and the permanent magnet has a convex shape that fits with the concave or convex shape of the fitting portion on both axial side surfaces facing both protruding edges of the support ring. Or, a structure in which a concave fitting portion is provided, and when the permanent magnet is attached to the support ring, the fitting portion between the support ring and the permanent magnet is fitted together while pressing at least one protruding edge from the axial direction of the support ring. It is what it was.

According to the above configuration, the permanent magnet is provided with a total of four circular concave fitting portions, for example, two at each of the axial end portions of the support ring at the circumferential end. On the other hand, the support ring
Both protruding edges are formed by protruding both edges in the axial direction in the radial direction, and a cylindrical shape (for example, a cylindrical shape fitted on a circular concave fitting portion of the permanent magnet) is formed on inner surfaces of the protruding edges facing each other. Convex)
Is provided.

When the permanent magnet is attached to the support ring, for example, the fitting portion on one side of the permanent magnet is fitted to the fitting portion of the support ring in order to fit the fitting portion of the permanent magnet to the fitting portion of the support ring. On the other hand, after fitting into the fitting portion on the inner surface of the protruding edge portion, the outer surface of the other protruding edge portion of the support ring is pressed from the outside in the axial direction, and the fitting portion on the inner surface of the other protruding edge portion and the other side surface of the permanent magnet Is fitted with the fitting part.

The permanent magnet attached to the support ring is restrained from moving at both protruding edges in the axial direction of the support ring, and is fitted in the axial direction of the support ring in the circumferential direction and the radial direction. The movement is restricted by. By doing this,
With a small number of members, the permanent magnet can be restrained in the circumferential direction, the axial direction, and the radial direction of the support ring.For example, when the fitting portion is provided between the permanent magnet and the support ring as described above,
The circumference becomes longer as the outer diameter increases due to the thermal expansion of the support ring, but at this time, the concave fitting portion of the permanent magnet may be processed into, for example, an elliptical shape with a margin in the circumferential direction. High precision machining of permanent magnets is not required.

In the eddy current type speed reducer according to the second aspect of the present invention, the brake is turned on by turning the permanent magnets uniformly arranged on the peripheral surface of the ferromagnetic support ring from the non-braking position to the braking position. In the eddy current type speed reducer for switching off, the support ring is provided with a concave or convex fitting portion on the peripheral surface at the position where the permanent magnet is disposed, and the outer peripheral axial both edges are radially aligned. The two protruding edges for radial restraint are formed to protrude and engage with both axial sides of the permanent magnet, while the permanent magnet has two protruding edges on the axial side opposite to the two protruding edges of the support ring. Forming the engaging portion, providing a convex or concave fitting portion to fit the concave or convex of the fitting portion on the surface arranged on the support ring, when attaching the permanent magnet to the support ring, After the support ring and the permanent magnet Is obtained by a structure for engaging the engaging portion of both said protruding edge and the permanent magnet to press the at least one protruding edge in the axial direction of the ring.

According to the above configuration, the permanent magnet is provided with a convex or concave fitting portion on the surface in contact with the support ring. A concave or convex fitting portion provided on the peripheral surface of the support ring fits into the convex or concave shape of the fitting portion. As described above, since the fitting portions of the support ring and the permanent magnet are fitted to each other on the peripheral surface of the support ring and the permanent magnet is fixed to the support ring, the permanent magnet is fixed while allowing thermal expansion of the support ring. can do.

The permanent magnet forms engaging portions on both sides in the axial direction of the support ring for engaging with both protruding edges, while the support ring engages with both axial edges on the outer periphery. Because it forms both protruding edges for radial restraint to engage with the part,
When the permanent magnet is mounted on the support ring, the protruding edge portion is pressed from the axial direction of the support ring, so that the engaging portion of the permanent magnet and both protruding edge portions can be engaged and fixed.

For example, the mounting structure of the support ring and the permanent magnet may be configured as follows. The fitting portion provided on the support ring forms, for example, a convex portion on the peripheral surface on which the permanent magnet is disposed, and both protruding edges of the support ring have one of them along the shape of the axial side surface of the permanent magnet, and the other has the other. It is in a state of protruding in the radial direction. On the other hand, the fitting portion provided on the permanent magnet is formed, for example, with a concave portion so as to be fitted to the fitting portion of the support ring, and the engaging portion of the permanent magnet is formed in the axial direction opposed to both protruding edges of the support ring. Both sides are inclined upward or downward.

In this case, the protrusion of the fitting portion provided on the support ring and the recess of the fitting portion provided on the permanent magnet are fitted at only one point, so that the permanent magnet can be moved in the axial direction and the circumferential direction of the support ring. It can be fixed, and by crimping the inclined engaging portion of the permanent magnet from the other of the two protruding edges of the support ring, the both protruding edges and the engaging portion are engaged. Thus, the permanent magnet can be fixed in the radial direction of the support ring.

In the above embodiment, both protruding edges of the support ring are formed by bending ends protruding in the radial direction into, for example, hooks in directions facing each other.
The engaging portion of the permanent magnet may be in a state in which a groove is formed in which the hooked portions of both protruding edges are engaged.

In this case, as described above, the fitting portion (convex portion) of the support ring and the fitting portion (recess portion) of the permanent magnet are fitted at only one point, so that the permanent magnet is connected to the shaft of the support ring. Direction and circumferential direction, and the bent portions of the both protruding edges of the support ring are engaged with the engaging portions in which the grooves of the permanent magnet are formed, so that both protruding edges are formed. The engagement portion engages, and the permanent magnet can be fixed in the radial direction of the support ring.

In addition, the structure in which the fitting portions of the permanent magnet and the support ring are fitted to each other may be such that the permanent magnet is supported by the support ring by this fitting structure. The same operation and effect as described above can be obtained by providing a structure in which both the concave portions are provided and the engaging members are inserted into these concave portions.

According to a third aspect of the present invention, there is provided an eddy current type speed reducer according to the second aspect of the present invention, wherein the support ring and the permanent magnet have a double protrusion instead of being fitted to each other. A projecting portion is formed in the edge portion at a position sandwiching the permanent magnet in the circumferential direction, and the projecting edge portions project in opposite directions to each other.

[0029] According to the above configuration, the protruding portion is formed by bending, for example, a portion located at a position sandwiching the permanent magnet in the circumferential direction in the both protruding edges of the support ring in a direction opposite to the both protruding edges. The two protruding edges restrain the permanent magnet from moving in the axial direction, and the protruding portions restrain the permanent magnet from moving in the circumferential direction. Further, the permanent magnet is pressed from the protruding edge to allow the permanent magnet to move in the radial direction. Can be restricted. By doing so, the same operation and effect as described above can be obtained. Needless to say, the protrusion is not limited to bending.

In the eddy current speed reducer according to the fourth aspect of the present invention, the permanent magnets uniformly arranged on the peripheral surface of the ferromagnetic support ring are pivoted from the non-braking position to the braking position to brake. In the eddy current type speed reducer for performing on / off switching, at least one axial side surface of the support ring projects radially from the peripheral surface of the support ring, and a position where the permanent magnet of the projected side wall is sandwiched in the circumferential direction. A side plate having a protrusion formed by projecting the protruding side wall toward the center of the peripheral surface width of the support ring is provided, while the permanent magnet has a notch formed on the upper portion to engage with the protrusion of the side plate. It was done.

According to the above configuration, the permanent magnet is engaged with the notches formed at, for example, four corners of the upper portion and the protruding portions of the side plates, thereby restricting the movement in the circumferential direction and the radial direction. The permanent magnet is restrained from moving in the axial direction by the protruding side wall of the side plate. In this manner, the permanent magnet can be fixed in three directions of the support ring in the radial direction, the circumferential direction, and the axial direction. By using a non-magnetic material for the side plate, magnetic leakage can be prevented through the side plate.

That is, the present invention described above restricts the movement of the permanent magnet in the three directions of the radial direction, the circumferential direction, and the axial direction of the support ring, and attaches the permanent magnet to the support ring. The point that the permanent magnet is not fixed by pressing from the outside in the radial direction but is pressed from the axial direction of the support ring is greatly different from the conventional one.

The permanent magnet does not receive much vibration load or the like due to repetition of braking ON / OFF in the axial direction of the support ring, so that the permanent magnet does not move as much as in the circumferential direction or the radial direction. Therefore, in the first aspect, the fitting portion between the permanent magnet and the support ring, in the second and third aspects, the both protruding edges of the support ring and the engaging portion of the permanent magnet, and in the fourth aspect, the projecting portion on the projecting side wall of the side plate. It is not necessary to seriously consider the state of engagement with the notch of the permanent magnet.

For the above reason, the surface for engaging the permanent magnet, that is, the fitting portion in the first aspect, the engaging portion in the second and third aspects, and the notch provided in the permanent magnet in the fourth aspect are precisely machined. This eliminates the necessity and reduces the production cost and time. In addition, by doing so, it becomes unnecessary to use a cushioning material for compensating the machining accuracy of the engaged state, especially for the permanent magnet, and as much as possible. Production cost and time can be reduced. Further, the present invention is employed in a single-row turning type eddy current type speed reducer, and can stably fix the permanent magnet even when the support ring and the permanent magnet are elongated in the axial direction.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an eddy current type speed reducer according to the present invention will be described below with reference to the drawings. FIG. 1 shows an eddy current type speed reducer according to claim 1 of the present invention. 2 to 6
1 shows an eddy current type speed reducer according to claim 2 of the present invention. FIG. 7 shows an eddy current type speed reducer according to claim 3 of the present invention. FIG. 8 shows an eddy current type speed reducer according to claim 4 of the present invention.

The present invention relates to an eddy current type speed reducer in which braking is switched on and off by turning a permanent magnet 1 uniformly arranged on the outer peripheral surface of a ferromagnetic support ring 2 from a non-braking position to a braking position. (The whole is not shown), in order to fix the permanent magnet 1 to the support ring 2, it is characterized as follows.

In the embodiment shown in FIG. 1, the permanent magnet 1
The figure shows a case where two circular concave fitting portions 1A are provided on one side and the other side in the axial direction of the support ring 2 in the circumferential direction. On the other hand, on the support ring 2, for example, both protruding edges 2Aa (one) and 2Ab (other) are formed by protruding both ends in the axial direction of the outer circumference in the radial direction. For example, a columnar (convex) fitting portion 2A that fits into the circular concave fitting portion of the permanent magnet is provided. In addition,
In the present embodiment, an example is shown in which the other protruding edge portion 2Ab is opened outward in the axial direction of the support ring 2 in advance.

In the embodiment shown in FIG. 1 having the above structure, when the permanent magnet 1 is attached to the support ring 2, for example, the fitting portion 1 A on one side of the permanent magnet 1 is attached to the support ring 2.
After fitting into the fitting portion 2A on the inner surface of the one protruding edge 2Aa, the outer surface of the other protruding edge 2Ab of the support ring 2 is pressed from the outside in the axial direction, and the inner surface of the other protruding edge 2Ab is fitted. This is performed by fitting the fitting portion 2A and the fitting portion 1A on the other side of the permanent magnet 1.

The movement of the permanent magnet 1 is restricted by the two protruding edges 2Aa and 2Ab in the axial direction of the support ring 2, and the permanent magnet 1 is fitted in the axial direction of the support ring 2 by the fitting portion 2A in the circumferential and radial directions. As a result, the permanent magnet 1 can be constrained in the circumferential, axial, and radial directions of the support ring 2 with a small number of members, and high-precision machining of the permanent magnet 1 is required. do not do.

In the above embodiment, the fitting portion 1A of the permanent magnet 1 is provided in a circular concave shape at two locations on one side and the other side in the axial direction of the support ring 2, respectively.
The fitting portions 2A inside Aa and 2Ab are formed in a columnar shape corresponding to them, but the permanent magnet 1 side is made to be convex, and both protruding edge portions 2A are formed.
a, 2Ab side may be concave. The positions where the fitting portions 1A on the side of the permanent magnet 1 are provided are not two at each of the one side and the other side in the axial direction of the support ring 2; As described above, there may be two places.

In the embodiment shown in FIG. 1, the permanent magnet 1 is mounted by pressing the other protruding edge 2Ab, which has been previously opened outward in the axial direction, toward the one protruding edge 2Aa. However, after the protruding edges 2Aa, 2Ab on both sides, which have been previously protruded in the radial direction, are opened outward in the axial direction, the permanent magnet 1 is inserted between the protruding edges 2Aa, 2Ab. The opening of the portions 2Aa and 2Ab outward in the axial direction may be closed.

The embodiment shown in FIG. 2 has the following configuration. The permanent magnet 1 has inclined portions 1a, 1a as engaging portions which are inclined so that the width of both side surfaces in the axial direction of the support ring 2 is enlarged in a direction in contact with the support ring 2. Further, the permanent magnet 1 is provided with, for example, a convex portion 1b as a fitting portion at a central portion of the inner peripheral surface in contact with the support ring 2 in the axial direction and the circumferential direction, for example, in this embodiment.

The support ring 2 is provided as a fitting portion at the center of the outer peripheral surface width at the place where the permanent magnet 1 is arranged.
In the present embodiment, a concave portion 2a is provided so that the convex portion 1a of the second member is fitted. In the support ring 2, one of the two outer peripheral edges in the axial direction conforms to the shape of the inclined portion 1 a of the permanent magnet 1, and the other has two projecting edges 2 Aa and 2 Ab that are projected in the radial direction. Is formed.

When the permanent magnet 1 and the support ring 2 are mounted in the above configuration, the projection 1b of the permanent magnet 1 and the recess 2a of the support ring 2 are fitted. Then, the permanent magnet 1 is crimped and attached at the protruding edge 2Ab on the other side of the support ring 2.

As described above, in the structure shown in FIG. 2, the permanent magnet 1 is
Is fitted in the concave portion 2 a of the support ring 2, whereby the movement of the support ring 2 in the axial direction and the circumferential direction is restricted.

In this mounting structure, the support ring 2
When the permanent magnet 1 is thermally expanded so as to increase its outer diameter due to a high temperature, the movement of the permanent magnet 1 in the circumferential direction and the axial direction is restricted at only one point of the fitting portion of the convex portion 1b and the concave portion 2a. Even if a change occurs in which only the support ring 2 expands during expansion, the change can be tolerated by the permanent magnet 1, and there is no shaking in the mounting.

Further, since the permanent magnet 1 is caulked by the other protruding edge 2Ab with respect to the support ring 2, both the inclined portions 1a, 1a and the both protruding edges 2Aa of the permanent magnet 1 are provided. , 2Ab are engaged, and movement in the radial direction is restricted. Therefore, no special mounting hardware is required, and high-precision machining of the permanent magnet 1 is not required. Therefore, the cost can be reduced, and the machining operation and the attachment are made very easy. And secure mounting can be performed.

In the example described above, the permanent magnet 1 has the protrusion 1
Although b shows the case where the concave portion 2a is formed in the support ring 2 to fit each other, for example, the concave portion may be formed in the permanent magnet 1 and the convex portion may be formed in the support ring to fit each other. .

The embodiment shown in FIG. 3 has the following configuration.
In FIG. 3, in the configuration of the embodiment shown in FIG. 2, instead of forming the convex portion 1 b on the permanent magnet 1 and providing the concave portion 2 a on the support ring 2, both the permanent magnet 1 and the support ring 2 serve as fitting portions. The recesses 1c and 2b are formed so as to face each other, and the engaging members 3 (for example, pins) are formed in the recesses 1c and 2b.
Shows an example in which is inserted.

As described above, the convex portion 1b and the concave portion 2 shown in FIG.
When the structure using the engaging member 3 as shown in FIG. 3 is adopted from the fitting structure of FIG. 3A, the number of members is increased by the amount of the engaging member 3 as compared with the embodiment of FIG. 1 is easy to process, and there is no buffer material interposed in the engaging portion. Therefore, the member for the permanent magnet 1 can be omitted because of the labor and the buffer material. The same operation and effect can be obtained.

The embodiment shown in FIGS. 4 and 5 has the following configuration. 4 and 5, the same reference numerals are given to the above-described structure and members of FIG. 2, and description thereof will be omitted. In the present embodiment shown in FIGS. 4 and 5, the permanent magnet 1 has a groove 1 d as an engaging portion in the circumferential direction on both axial side surfaces of the support ring 2. On the other hand, the support ring 2 is formed with a bent portion 2Ac formed by bending the ends of both protruding edges 2Aa and 2Ab that protrude in the radial direction into a hook shape in directions facing each other.

In the case of the above configuration, the attachment of the permanent magnet 1 to the support ring 2 is performed as follows.
As shown in FIG. 5A, the support ring 2 has, for example, a state in which the other protruding edge 2Ab is opened outward in the axial direction in advance. Then, as shown in FIG. 5B, the protrusion 1 b of the permanent magnet 1 is fitted into the recess 2 a of the support ring 2, and the groove 1 d of the permanent magnet 1 and one protruding edge of the support ring 2 are fitted. The bent portion 2Ac of 2Aa is engaged.

Then, as shown in FIG. 5C, the other protruding edge 2Ab is pressed in the direction of the one protruding edge 2Aa, so that the bent portion 2Ac of the other protruding edge 2Ab is pressed against this. Engagement with the corresponding groove 1d of the permanent magnet 1 completes the mounting. Also in this case, the fitting portion (convex portion 1b) of the permanent magnet 1 and the fitting portion (recess portion 2a) of the support ring 2 are fitted to restrict the permanent magnet 1 in the axial direction and the circumferential direction of the support ring 2. And both bent portions 2A of the projecting edges 2Aa, 2Ab.
By engaging c and 2Ac with the engaging portions (grooves 1d and 1d) of the permanent magnet 1, the permanent magnet 1 is restrained in the radial direction of the support ring 2. Even in this case, the same operation and effect as described above can be obtained.

In the embodiment shown in FIGS. 4 and 5,
The permanent magnet 1 is mounted by pressing the other protruding edge 2Ab, which has been opened to the outside in the axial direction in advance, toward the one protruding edge 2Aa. After the projecting edges 2Aa, 2Ab on both sides are opened outward in the axial direction, the permanent magnet 1 is moved to the projecting edges 2Aa, 2A.
b, and then the opening of the protruding edges 2Aa, 2Ab outward in the axial direction may be closed.

The embodiment shown in FIG. 6 has the following configuration.
In FIG. 6, the same members as those in the structure of FIG. 4 described above are denoted by the same reference numerals, and description thereof will be omitted. In the embodiment of FIG. 6, the permanent magnet 1 forms an engagement convex portion 1 e that is convex in the axial direction at a central portion in a circumferential direction on a surface in contact with the support ring 2 as a fitting portion of the permanent magnet 1. are doing. On the other hand, the support ring 2 has an engagement groove 2Ad fitted to the engagement protrusion 1e as a fitting portion of the support ring 2.
Are formed over both side surfaces in the axial direction.

In the embodiment shown in FIG. 6, the permanent magnet 1 and the support ring 2 are attached according to the procedure of FIG. 5 described above. In this case, the fitting portion of the permanent magnet 1 (engaging protrusion 1e) and the fitting portion of the support ring 2 (engaging groove 2).
Ad) and the permanent magnet 1 is constrained in the circumferential direction of the support ring 2, and the both bent portions 2Ac and 2Ac of the both protruding edges 2Aa and 2Ab are engaged with the engaging portion (groove 1d) of the permanent magnet 1. , 1
By engaging in d), the permanent magnet 1 is restrained in the radial direction and the axial direction of the support ring 2. Even in this case, the same operation and effect as described above can be obtained.

In the embodiment shown in FIG.
The engaging portions of the permanent magnet 1 are the inclined portions 1a, 1a shown in FIG. 2, and the projecting edges 2Aa, 2Ab of the support ring 2 are also configured as shown in FIG. May be swaged. Further, in the embodiment shown in FIG. 6, a key groove may be formed as a fitting portion of the permanent magnet 1 and a fitting portion of the support ring 2, and a key may be inserted into the key groove. Further, in that case, the engaging portion (inclined portion 1a, 1a) and both projecting edge portions 2Aa,
A structure for engaging with 2Ab may be adopted.

FIG. 7 shows an embodiment according to claim 3 of the present invention. 5, the same members as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, the permanent magnet 1
Is in a state in which no processing is performed except for forming the inclined portion 1a as the engaging portion as compared with the state shown in FIG.

On the other hand, the support ring 2 has both protruding edges 2Aa and 2Ab as in FIG. 2, but in the structure of FIG. 7, the protruding edges 2Aa and 2Ab One of them has a shape along the inclined portion 1a of the permanent magnet 1 and the other has a shape protruding in the radial direction, which is the same as the above. The point is that a bent portion 2c is formed as a protruding portion formed by, for example, bending the protruding edge portions 2Aa and 2Ab in a direction opposed to each other to protrude.

That is, in FIG. 2, the permanent magnet 1 has a fitting portion for the permanent magnet 1 and a fitting portion for the support ring 2 to restrict the permanent magnet 1 in the circumferential direction and the axial direction. Instead of these, a bent portion 2c formed by bending both protruding edges 2Aa and 2Ab in directions facing each other is formed at a position sandwiching the permanent magnet 1 in the circumferential direction, thereby constraining the permanent magnet 1 in the circumferential direction. .

According to the configuration shown in FIG. 7, in the permanent magnet 1, the axial movement of the support ring 2 is restricted by the two projecting edges 2Aa, 2Ab, and the inclined portions 1a, 1a
Ab swaged with Ab and inclined portions 1a, 1a and both projecting edges 2A
The movement of the support ring 2 in the radial direction is restrained by the engagement of a and 2Ab, and the circumferential movement of the support ring 2 is restrained by the bent portion 2c.

As described above, according to the configuration shown in FIG. 7, the interval between the bent portions 2c, 2c in the circumferential direction becomes longer due to the thermal expansion of the support ring 2, and the change in the thermal expansion of the support ring 2 is allowed. Further, at that time, the relative movement of the permanent magnet 1 in the circumferential direction cannot be restrained, so that it seems to be seemingly inferior to the embodiment shown in FIGS. Can be

However, since the permanent magnet 1 is caulked from one side in the axial direction of the support ring 2, the permanent magnet 1 can be securely moved in three directions of the radial direction, the circumferential direction, and the axial direction of the support ring 2 as compared with the related art. In addition, the same effect as that of the above embodiment can be obtained in that the processing accuracy of the permanent magnet 1 does not matter and unnecessary members can be omitted.

FIG. 8 shows an embodiment according to claim 4 of the present invention. 8, the same members as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, in FIG. 8, the permanent magnet 1 has cutouts 1 f at upper four corners, for example.

On the other hand, on the axial side of the support ring 2, a notch of the permanent magnet 1 protrudes radially from the peripheral surface of the support ring 2 at a position sandwiching the permanent magnet 1 on the protruding side wall 2 Ba in the circumferential direction. There is provided a side plate 2B on which a projecting portion 2Bb projecting toward the center of the peripheral surface of the support ring so as to engage with 1f is formed. The side plate 2B can prevent magnetic leakage by adopting a non-magnetic material.

The side plate 2B and the support ring 2
Is attached, for example, by screwing a screw B into a screw hole P provided on an axial end face of the support ring 2 through a hole formed in the side plate 2B.

When attaching the permanent magnet 1 to the support ring 2, first, one side plate 2 B is attached to the support ring 2, and then the side plate 2
B is arranged on the support ring 2 while engaging the notch 1f of the permanent magnet 1 with the protrusion 2Bb of the permanent magnet 1, and then the protrusion 2Bb of the other side plate 2B is connected to the notch 1f of the permanent magnet 1.
And is attached to the support ring 2 while being engaged.

The permanent magnet 1 has two projecting side walls 2Ba, 2Ba
The movement of the support ring 2 in the axial direction is restricted by this, and the protrusion 2Bb is engaged with the notch 1f of the permanent magnet 1 to restrict the movement in the circumferential and radial directions.
Even in this case, the same operation and effect as described above can be obtained.

If only one side plate 2B is formed integrally with the support ring 2 and the other side plate 2B is attached to the support ring 2, the number of members can be further reduced. Although the cutouts 1f are provided at the upper four corners in the above description, the cutouts 1f may be provided at only one location on one side, for example, at two circumferentially central positions of the four corners. In this case, it goes without saying that the protruding portion 2Bb of the side plate 2B is provided corresponding to the additional notch 1f.

[0070]

As described above, in the eddy current type speed reducer of the present invention, the permanent magnet is provided in the radial direction of the support ring in consideration of the thermal expansion difference between the permanent magnet and the support ring. In addition to securely fixing in three directions, circumferential direction and axial direction, there is no need to process the permanent magnet with high precision.
In addition, the number of members required for mounting can be reduced, such as omitting a buffer material interposed between the permanent magnet and the mounting surface required when the permanent magnet is not machined with high precision. It is possible to greatly reduce the size.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an eddy current type speed reducer according to claim 1 of the present invention.

FIGS. 2A and 2B show an embodiment of an eddy current type reduction gear according to claim 2 of the present invention, wherein FIG. 2A is a view showing a circumferential section of a permanent magnet and a support ring, and FIG. It is a figure which shows the -A line cross section.

3A and 3B show another embodiment of the eddy current type reduction gear according to claim 2 of the present invention, wherein FIG. 3A is a diagram showing a circumferential section of a permanent magnet and a support ring, and FIG. FIG. 3 is a view showing a cross section taken along line BB of FIG.

4A and 4B show another embodiment of the eddy current type reduction gear according to claim 2 of the present invention, wherein FIG. 4A is a diagram showing a circumferential section of a permanent magnet and a support ring, and FIG. FIG. 5 is a view showing a cross section taken along line CC of FIG.

5 (a) to 5 (c) are views showing a situation where a permanent magnet is attached to a support ring in the configuration shown in FIG.

FIGS. 6A and 6B show another embodiment of the eddy current type reduction gear according to claim 2 of the present invention, wherein FIG. 6A is a perspective view before (b) a permanent magnet is attached to a support ring, and FIG. FIG. 3C is a diagram showing a cross section taken along line DD, and FIG. 3C is a diagram showing a cross section taken along line EE in FIG.

FIG. 7 shows an embodiment of an eddy current type reduction gear according to claim 3 of the present invention, (a) is a perspective view of a permanent magnet and a support ring,
(B) is the figure which looked at (a) from F direction.

FIG. 8 shows an embodiment of an eddy current type reduction gear according to claim 4 of the present invention, wherein (a) is an exploded perspective view of a permanent magnet and a support ring, and (b) is a GG line of (a). It is sectional drawing.

[Explanation of symbols]

 Reference Signs List 1 permanent magnet 1A fitting portion 1a inclined surface (engaging portion) 1b convex portion (fitting portion) 1c concave portion (fitting portion) 1d groove (engaging portion) 1e engaging convex portion (fitting portion) 1f cutout portion 2 Support ring 2A Fitting portion 2Aa Projecting edge 2Ab Projecting edge 2Ac Bending portion 2Ad Engaging groove 2B Side plate 2Ba Projecting side wall 2Bb Projecting portion 2a Recess (fitting portion) 2b Recess (fitting portion) 2c Folding portion (Projection)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiromi Yanagido 5-1-1109 Shimaya, Konohana-ku, Osaka-shi, Japan F-term in Sumikin Design Engineering Co., Ltd.

Claims (4)

[Claims] 1. An eddy current type speed reducer in which braking is switched on and off by turning a permanent magnet uniformly arranged on a peripheral surface of a ferromagnetic support ring from a non-braking position to a braking position. In the support ring, while forming both protruding edges in which both axial edges protrude in the radial direction,
A concave or convex fitting portion is provided on the inner surface of each of the two protruding edges facing each other, and the permanent magnet has the fitting portions on both side surfaces in the axial direction facing the both protruding edges of the support ring. When the permanent magnet is attached to the support ring, the support is provided while pressing at least one protruding edge from the axial direction of the support ring when the permanent magnet is attached to the support ring. An eddy current type speed reducer, wherein a fitting portion between a ring and a permanent magnet is fitted to each other. 2. An eddy current type speed reducer in which braking is switched on and off by turning a permanent magnet evenly arranged on a peripheral surface of a ferromagnetic support ring from a non-braking position to a braking position. The support ring is provided with a concave or convex fitting portion on the peripheral surface at the position where the permanent magnet is arranged, and both axial sides of the outer periphery are projected in the radial direction so that both sides in the axial direction of the permanent magnet are provided. The permanent magnet is formed with both projecting edges for engagement in the radial direction, while the permanent magnet is formed with engaging portions on both side surfaces in the axial direction facing the both projecting edges of the support ring. Providing a convex or concave fitting portion to be fitted with the concave or convex shape of the fitting portion on a surface arranged on the support ring, and attaching the permanent magnet to the support ring, After the fitting portions of the magnets are fitted together, An eddy current reduction device having a structure in which at least one protruding edge is pressed from the axial direction of the ring to engage the two protruding edges with the engaging portion of the permanent magnet. 3. In place of the fitting between the fitting portions of the support ring and the permanent magnet, the support ring is provided with the two protruding edges at positions on both protruding edges that sandwich the permanent magnet in the circumferential direction. 3. An eddy current type reduction gear according to claim 2, wherein a protruding portion is formed so as to protrude in the opposite direction. 4. An eddy current type speed reducer for turning on / off braking by rotating a permanent magnet uniformly arranged on a peripheral surface of a ferromagnetic support ring from a non-braking position to a braking position. At least one side surface in the axial direction of the support ring protrudes radially from the peripheral surface of the support ring, and the protruded side wall is formed at a position sandwiching the permanent magnet of the protruded side wall in the circumferential direction. A side plate with a protruding part that protrudes to the center is provided,
On the other hand, in the eddy current type reduction gear, the notch formed in the upper portion of the permanent magnet engages with the protrusion of the side plate.