JP2000139070A - Eddy-current activated reduction gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain outstanding braking force and inexpensive manufacture without need for upsizing a gear. SOLUTION: This reduction gear is provided with a rotor 6 involving a cylindrical part 6a formed out of ferromagnetic material and integrally mounted on a rotating shaft 1, a plurality of cylindrical switch boards 23 facingly disposed at a prescribed interval to the inner peripheral surface of the cylindrical part 6a of the rotor 6 and formed out of the ferromagnetic body fixed in series through non-magnetic material 22, a supporting ring 24 facingly disposed at a prescribed interval to the inner peripheral surfaces of the switch boards 23 and formed of the ferromagnetic material, and permanent magnet trains 25 disposed on the outer-periphery surface of the supporting ring 24 and having equal polarities along the peripheral direction of the rotor 6. The permanent magnet trains 25 are disposed around its periphery so as to reverse the polarities in the axial direction of the rotating shaft 1. The permanent magnet trains 25 are formed so as to advance and retreat in the axial direction of the rotating shaft 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eddy current type speed reducer mounted on a large vehicle such as a bus or a truck as a brake assist device.

[0002]

2. Description of the Related Art In recent years, large vehicles such as buses and trucks perform stable deceleration on long downhills and the like to reduce the number of times of using a foot brake to prevent abnormal wear of a lining and a fade phenomenon. At the same time, in order to shorten the braking stop distance, an eddy current reduction device has been mounted in addition to a foot brake as a main brake and an exhaust brake as an auxiliary brake. The eddy current type speed reducer includes a type using an electromagnet and a type using a permanent magnet as a magnet.

FIGS. 7 and 8 show an example of this eddy current type reduction gear proposed in Japanese Patent Application Laid-Open No. 1-234043.
As shown in (1), a rotor 6 is fitted to one end of the rotating shaft 1 and a magnetic shield casing having a cylindrical portion 8 separated from the rotor 6 is fixedly arranged adjacent to the rotor 6, and is arranged circumferentially. The polarities of the adjacent magnets are opposite to each other, and the support ring 3 around which a plurality of permanent magnets 4 are provided is attached to the rotor 6 in the axial direction of the rotating shaft 1 such that the pole faces of the permanent magnets 4 have a required gap. The length from the position facing the entire surface to the position of the magnetic shield casing detaching from the entire surface can be advanced and retracted. 7 and 8, 2
Is a guide rail 11 for guiding the movement of the support ring 3
Is a support member attached to the top surface, and 7 is a pole piece adhered to the outer peripheral surface of the permanent magnet 4.

In the eddy current type speed reducer proposed in Japanese Patent Application Laid-Open No. 1-234043, when the permanent magnet 4 is entirely opposed to the rotor 6 as shown in FIG.
Then, a magnetic circuit is formed by the rotor 6 and an eddy current is generated in the rotor 6, so that a so-called braking ON state occurs, and a braking torque is generated.

If the permanent magnet 4 is gradually retracted from the braking ON position shown in FIG. 7, the generated braking torque is gradually reduced and the braking force is reduced. Then, when the permanent magnet 4 finishes retreating and comes to a position where it is completely separated from the rotor 6 shown in FIG. 8, the braking is released.

On the other hand, the one proposed in Japanese Patent Publication No. Hei 7-118901, as shown in FIGS. 9 to 11, has a rotor 6 provided on a rotating shaft and supported from a fixed side opposite to the rotor 6. A fixed support ring 10a having a group of permanent magnets 9a in which N poles and S poles are alternately arranged at predetermined intervals along a circumferential direction thereof, and adjacent to the fixed support ring 10a and opposed to the rotor 6 Rotating support ring 1 having the same group of permanent magnets 9b as the fixed support ring 10a, and being rotatable with respect to the fixed support ring 10a.
0b, and a switch plate 5 extending from above each permanent magnet 9a of the fixed support ring 10a to above the rotary support ring 10b. Note that 12 in FIGS.
Denotes a bearing, and 14 denotes a non-magnetic material interposed between adjacent switch plates 5.

In the eddy current reduction device proposed in Japanese Patent Publication No. Hei 7-118901, as shown in FIG. 9, two permanent magnets 9a and 9b on the fixed side and the rotating side facing one switch plate 5 are provided. Rotation support ring 1 at a position where the polarities of
0b, the permanent magnets 9 adjacent in the circumferential direction are moved.
a, 9b, between the switch plate 5 and the cylindrical portion 6 of the rotor 6
As shown by arrows in FIG. 9B, including the inner peripheral surface of a,
A magnetic circuit is formed and a so-called braking ON state occurs, and an eddy current occurs on the inner peripheral surface of the cylindrical portion 6a to generate a braking torque.

Further, the rotation support ring 10b is turned from the above-mentioned brake ON position, and as shown in FIG. 10, the two permanent magnets 9a and 9b on the fixed side and the rotation side opposed to one switch plate 5 are rotated. When the rotation support ring 10b is rotated to a position where the polarities are opposite to each other, the one switch plate 5 and the two permanent magnets 9a and 9b opposed thereto are connected as shown in FIG.
As shown by an arrow, a magnetic circuit is formed, and no magnetic flux generated from the permanent magnets 9a and 9b acts on the inner peripheral surface of the cylindrical portion 6a of the rotor 6, so that no eddy current flows and no braking torque is generated. (Brake OFF state).

[0009]

However, the eddy current type reduction gear proposed in Japanese Patent Application Laid-Open No. 1-234043 has the following problems.
ON / OFF of braking by sliding the permanent magnet in the axial direction of the rotating shaft and facing the rotor entirely or detaching it entirely
Since the switching is performed, the mounting space in the axial direction becomes longer and the entire device becomes larger, so that there is a problem that the mountability to an automobile is poor.

On the other hand, the eddy current type speed reducer proposed in Japanese Patent Publication No. Hei 7-118901 switches the braking ON / OFF by rotating a group of permanent magnets.
Unlike the eddy current type speed reducer proposed in Japanese Patent No. 234404, an axially long mounting space is not required, and the entire device can be reduced in size. However, the permanent magnet group includes a rotating support ring and a fixed support ring. Therefore, the number of parts increases, the manufacturing cost increases, and it is economically disadvantageous.

[0011] Further, in each of the proposals described in Japanese Patent Application Laid-Open No. Hei 1-234043 and Japanese Patent Publication No. Hei 7-118901, the magnets are arranged at predetermined intervals in the circumferential direction so that the poles are alternated. Since this is arranged, if this interval is too narrow,
When the brake is ON, a short-circuit magnetic circuit is formed between magnets having circumferentially adjacent and opposite polarities, and the magnetic flux density acting on the cylindrical portion of the rotor decreases. Therefore, since a gap equal to or more than a certain value is required between magnets adjacent in the circumferential direction, the number of magnets that can be arranged on the circumference is limited. In order to increase the braking force by arranging more magnets, it is necessary to increase the shape of the magnets in the direction of the rotation axis of the rotor or in the radial direction, resulting in an increase in the size of the entire apparatus.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and does not increase the size of the apparatus, has excellent braking force, and can be manufactured at low cost. It is intended to provide a device.

[0013]

In order to achieve the above-mentioned object, an eddy current type speed reducer according to the present invention has a cylindrical portion made of a ferromagnetic material, and a rotor integrally mounted on a rotating shaft. A plurality of switch plates made of a ferromagnetic material, which are arranged opposite to the inner peripheral surface of the cylindrical portion at a predetermined interval, are fixed in series via a non-magnetic material, and the inner peripheral surfaces of these switch plates are fixed. A permanent magnet or an electromagnet array having the same polarity along the circumferential direction of the rotor is provided on the outer peripheral surface of a support ring made of a ferromagnetic material which is disposed oppositely at a predetermined interval. A plurality of rows are provided so as to be opposite. By doing so, it is possible to manufacture the apparatus without increasing the size of the entire apparatus, with excellent braking force, and at low cost.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An eddy current type speed reducer according to the present invention has a cylindrical portion made of a ferromagnetic material, a rotor integrally mounted on a rotating shaft, and an inner peripheral surface of the cylindrical portion in the rotor. A plurality of cylindrical switch plates made of a ferromagnetic material fixedly arranged in series via a non-magnetic material and opposed to each other at a predetermined distance, and a predetermined distance from the inner peripheral surface of these switch plates. A support ring made of a ferromagnetic material and disposed opposite to each other, and a permanent magnet or an electromagnet row arranged on the outer peripheral surface of the support ring and having the same polarity along the circumferential direction of the rotor. The magnet or electromagnet row is provided in a plurality of rows around the axis of the rotating shaft so that the polarities are opposite, and if necessary, the polarities are opposite in the axial direction of the rotating shaft. Permanent with the same polarity along the circumference of the rotor A row of stones or electromagnets is provided so as to be able to advance and retreat in the axial direction of the rotating shaft, and a plurality of cylindrical switch plates made of a ferromagnetic material fixed in series via a non-magnetic material are connected to the rotating shaft. It is provided so that it can move back and forth in the axial direction,
The switch plate is brought into contact with both inner side walls of a case that covers a row of permanent magnets or electromagnets that have the same polarity along the circumferential direction of the rotor and is arranged in a plurality of rows so that the polarities are opposite in the axial direction of the rotating shaft. A ring made of a ferromagnetic material is provided as described above, and the support ring is divided for each permanent magnet or electromagnet row. May be provided so as to be movable in the axial direction of the rotating shaft.

In the eddy current type speed reducer according to the present invention, the switch plate and the permanent magnet or electromagnet array having the same polarity overlap in the circumferential direction of the rotor, or the switch plate and the permanent magnet or electromagnet array overlap, and When the divided support rings are brought into contact with each other, the support ring, the permanent magnet or electromagnet array adjacent in the axial direction of the rotating shaft, the switch plate adjacent in the axial direction of the rotating shaft, and the cylindrical portion of the rotor. A magnetic circuit is formed, so-called braking ON state,
The magnetic flux from the permanent magnet acts on the cylindrical portion to generate an eddy current, and a braking torque is generated.

From the above-mentioned braking ON position, the permanent magnets or the electromagnet rows may be in a state of being overlapped half by one over the switch plate adjacent in the axial direction of the rotating shaft, or each of the divided support rings may When contacting a ring made of a ferromagnetic material, a support ring, a permanent magnet or an electromagnet row adjacent in the axial direction of the rotation axis, and a switch plate that straddles these permanent magnets or the electromagnet row, or a support ring,
A short-circuited magnetic circuit is formed by the permanent magnet or electromagnet row, the switch plate, and the ring, and a so-called braking OFF state is established.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An eddy current type speed reducer according to the present invention will be described below with reference to the embodiments shown in FIGS. 1 to 6
The same reference numerals as those in FIGS. 7 to 11 denote the same or corresponding parts, and a detailed description thereof will be omitted. FIG. 1 is an explanatory view of a main part of an eddy current type speed reducer according to the present invention, and is a cross-sectional view in a rotation axis direction.
FIG. 2 is a perspective view for explaining a magnet array constituting the eddy current type speed reducer of the present invention, and FIG. 3 is an explanatory view of the eddy current type speed reducer of the present invention corresponding to claim 2. The upper half of FIG. FIG. 4 is a diagram showing the state, the lower half is a diagram showing a state of braking OFF, and FIG. 4 is an explanatory diagram of an eddy current type speed reducer according to the present invention corresponding to claim 3, and the upper half is a state of braking ON. FIG. 5 is a diagram showing a state in which braking is OFF, and FIG. 5 is an explanatory diagram of an eddy current type reduction gear of the present invention corresponding to claim 4, and FIG.
FIG. 6 is a perspective view for explaining a magnet row and a switch plate constituting the eddy current type speed reducer of the present invention.

In FIG. 1 to FIG. 6, reference numeral 21 denotes a case rotatably supported on the rotating shaft 1 via a bearing. The case 21 has a cylindrical ferromagnetic material such as low carbon steel. In the state where the body switch plates 23 are magnetically insulated from each other in the axial direction of the rotating shaft 1 via a non-magnetic body 22 such as aluminum, for example, three in FIGS. 1 and 3 and FIG. 5 is installed in series in the axial direction of the rotating shaft 1 by two bolts 28 made of a non-magnetic material such as aluminum. These switch plates 23 are disposed so as to face the inner peripheral surface of the cylindrical portion 6a of the rotor 6 which is integrally attached to the rotating shaft 1 via, for example, the support member 13 at a predetermined interval.

Reference numeral 24 denotes a support ring made of a ferromagnetic material such as a low-carbon steel, which is disposed to face the inner peripheral surface of the switch plate 23 at a predetermined interval, and is, for example, shown in FIGS.
In the embodiment shown in FIG. 5, the one integrated in the axial direction of the rotating shaft 1 is shown, and in the embodiment shown in FIG. 5, the one divided into two in the axial direction of the rotating shaft 1 is shown.

On the outer peripheral surface of the support ring 24, for example, a row of permanent magnets 25 having the same polarity is arranged along the circumferential direction of the rotor 6. And this permanent magnet row 25
In the axial direction of the rotating shaft 1, for example, three in FIGS. 1, 3 and 4, and one in each support ring 24 in FIG.
A total of two are provided around the outer peripheral surface of the support ring 24 so that the polarities are opposite.

In the embodiment shown in FIG. 3, for example, a bearing 26 is provided between the support ring 24 and the case 21 so that the support ring 24 can be freely moved in the axial direction of the rotating shaft 1. None, by attaching the rod end of the air cylinder 27 to one side of the support ring 24,
The above-mentioned permanent magnet array 25 can be advanced and retracted in the axial direction of the rotating shaft 1 by the reciprocating movement of the rod.

In the eddy current type speed reducer shown in FIG. 3, as shown in the upper half of FIG. 3, the rod of the air cylinder 27 is protruded to move the support ring 24 so that each switch plate 23 and each permanent When the magnet rows 25 are entirely overlapped, a magnetic circuit is formed by the support ring 24, the adjacent permanent magnet rows 25, the adjacent switch plate 23, and the cylindrical portion 6a of the rotor 6, and the rotating cylindrical portion is rotated. When the magnetic field 6a crosses the magnetic field from the permanent magnet row 25, an eddy current generated in the cylindrical portion 6a and the action of the magnetic field cause a braking torque to be generated in the cylindrical portion 6a, that is, a so-called braking ON state.

Further, from the above-mentioned braking ON position, FIG.
When the rods of the air cylinder 27 are retracted as in the lower half, and each permanent magnet row 25 is overlapped half by half over the switch plate 23 adjacent in the axial direction of the rotating shaft 1, the support ring 24 and adjacent permanent magnet rows 25
Then, a short-circuit magnetic circuit is formed by the switch plate 23, and a so-called braking OFF state is established. In this state, no magnetic flux generated from the row of permanent magnets 24 acts on the cylindrical portion 6a of the rotor 6, so that no eddy current flows through the cylindrical portion 6a and no braking torque is generated.

As described above, in the embodiment shown in FIG. 3, the ON / OFF switching of the braking is performed by switching the permanent magnet array 25 to the switch plate 2.
3 only needs to be moved slightly with respect to
Is not required to be entirely separated from the cylindrical portion 6a of the rotor 6, so that the amount of movement of the permanent magnet array 25 due to ON / OFF switching of the braking can be reduced, and the apparatus can be downsized.

On the other hand, in the embodiment shown in FIG.
Switch plate 23 and non-magnetic body 2 integrally fixed by
2 is made freely movable in the axial direction of the rotary shaft 1 with respect to the case 21, and the rod end of the air cylinder 27 is attached to one side of the switch plate 23 and the non-magnetic body 22 which are integrally fixed. Switch plate 2
3 and the non-magnetic body 22 can move forward and backward in the axial direction of the rotating shaft 1.

In the eddy current type speed reducer shown in FIG. 4, the rod of the air cylinder 27 is protruded to move the switch plate 23 and the non-magnetic member 22 as shown in the upper half of FIG. When the plate 23 and the permanent magnet rows 25 are entirely overlapped with each other, a magnetic circuit is formed by the support ring 24, the adjacent permanent magnet row 25, the adjacent switch plate 23, and the cylindrical portion 6 a of the rotor 6. , Rotating cylindrical part 6
a crosses the magnetic field from the row of permanent magnets 25,
As a result of the action of the eddy current and the magnetic field generated in a, a braking torque is generated in the cylindrical portion 6a, ie, a so-called braking ON state.

Also, from the above-described position where the brake is ON, FIG.
When the rods of the air cylinder 27 are retracted as in the lower half, and each permanent magnet row 25 is overlapped half by half over the switch plate 23 adjacent in the axial direction of the rotating shaft 1, the support ring 24 and adjacent permanent magnet rows 25
Then, a short-circuit magnetic circuit is formed by the switch plate 23, and a so-called braking OFF state is established. In this state, no magnetic flux generated from the row of permanent magnets 24 acts on the cylindrical portion 6a of the rotor 6, so that no eddy current flows through the cylindrical portion 6a and no braking torque is generated.

As described above, in the embodiment shown in FIG. 4, the ON / OFF switching of the braking is performed by setting the switch plate 23 to the permanent magnet array 2.
5 only needs to be moved slightly with respect to
Is not required to be entirely separated from the cylindrical portion 6a of the rotor 6, so that the amount of movement of the switch plate 23 due to the ON / OFF switching of the braking can be reduced, and the apparatus can be downsized.

In contrast to the embodiment shown in FIGS. 3 and 4, in the embodiment shown in FIG. 5, for example, a low carbon steel A ring 29 made of a ferromagnetic material is provided. On the other hand, the arm 30 attached to the piston of the air cylinder 27 is attached to the two divided support rings 24, 24, and the piston moves in the rotation direction of the rotor 6. The support rings 24, 24 are also turned in the rotation direction of the rotor 6 via bearings 26 provided between the support rings 24, 24 and the case 21. At this time, by attaching spiral guide rails having different directions below the support rings 24, 24 to the inner bottom surface of the case 21, the support rings 24, 24 move in the axial direction while rotating in the rotational direction. I will be.

In the eddy current type speed reducer shown in FIG. 5, the piston of the air cylinder 27 is moved, for example, in the direction of rotation of the rotor 6 as shown in the upper half of FIG. When the permanent magnet rows 25 are entirely overlapped and the support rings 24, 24 are in contact with each other, the support rings 24, 24 and the adjacent permanent magnet row 2
5 and the adjacent switch plate 23 and the cylindrical portion 6a of the rotor 6 form a magnetic circuit, and the eddy current generated in the cylindrical portion 6a when the rotating cylindrical portion 6a crosses the magnetic field from the permanent magnet row 25. By the action of the magnetic field, a braking torque is generated in the cylindrical portion 6a, that is, a so-called braking ON state is set.

Also, from the above-mentioned position where the brake is ON, FIG.
As in the lower half, the piston of the air cylinder 27 is moved in the anti-rotation direction or the rotation direction of the rotor 6 to separate the support rings 24,
9 so that each support ring 24, 24,
Each permanent magnet row 25, each switch plate 23, and each ring 2
9 and a short-circuit magnetic circuit is formed, so-called braking OF
The state becomes F. In this state, the cylindrical portion 6a of the rotor 6
Since no magnetic flux generated from the permanent magnet row 24 acts on the cylindrical portion 6a, no eddy current flows through the cylindrical portion 6a, and no braking torque is generated.

As described above, in the embodiment shown in FIG. 5, the ON / OFF switching of the braking is performed by connecting the support ring 24 to the permanent magnet array 2.
5, the permanent magnet array 25 does not need to be entirely separated from the cylindrical portion 6a of the rotor 6, so that the amount of movement of the switch plate 23 due to ON / OFF switching of the braking can be reduced. Can be reduced in size. In FIGS. 1, 3 to 5, 6b is a cooling fin formed on the outer periphery of the cylindrical portion 6a.

In the eddy current type speed reducer according to the present invention described above, the magnetic circuit when the brake is ON and when the brake is OFF are:
Since both are formed in a cross section in the direction of the rotation axis, the magnets can be continuously arranged in the circumferential direction as shown in FIG. Therefore, compared with a conventional eddy current type speed reducer in which magnets having different poles are arranged at predetermined intervals in the circumferential direction, the amount of magnets that can be arranged in the same space increases, and when the devices are the same size, the braking force is reduced. Becomes larger. It is needless to say that the magnet may be divided into circumferential parts and assembled into a cylindrical shape. Further, in FIGS. 1 to 6, the permanent magnet or electromagnet row is shown as having two or three rows arranged in the axial direction of the rotating shaft, but may be four or more rows.

Further, in the conventional eddy current type speed reducer, the magnets 9a and 9b having different poles are arranged at predetermined intervals in the circumferential direction. Therefore, as shown in FIG. It is necessary to fix with a non-magnetic material 14 at a predetermined interval, and is usually manufactured by casting. On the other hand, in the eddy current type speed reducer according to the present invention, the switch plate 2
3 and the non-magnetic member 22 for fixing the switch plate 23 are both cylindrical with the same diameter, so that, for example, the switch plate 23 and the non-magnetic member 22 are alternately stacked in the axial direction of the rotary shaft 1 and the bolt 2
By fixing the outer peripheral side of the case 21, the outer peripheral side of the case 21 can be formed. Therefore, as compared with the conventional eddy current type speed reducer, the time required for manufacturing is reduced, and the cost can be reduced.

Incidentally, as an eddy current type speed reducer shown in FIGS. 3 to 5 for confirming the effect of the present invention, the cylindrical portion 6a of the rotor 6 (inner diameter is about 380 mm, thickness is about 20 m)
m, the axial length is about 80 mm) of Cr-Mo based low alloy steel, the permanent magnet row 25 is a neodymium-iron-boron based permanent magnet, the support ring 24 and the switch plate 23. The ring 29 was made of low carbon steel, and the non-magnetic material 22 and the bolt 28 were made of aluminum.

Then, a braking test was performed using these eddy current type speed reducers as test specimens. In the braking test, the test body is mounted on the middle of the propeller shaft at the rear of the transmission in a large truck, and the braking torque (kg · m) when the rotation speed of the propeller shaft reaches 2000 rpm.
Was measured. The eddy current type speed reducer having the structure shown in FIG. The eddy current type speed reducer having the structure shown in FIG. 2, the eddy current speed reducer having the structure shown in FIG. 3 is assumed. As a comparative example,
An eddy current type speed reducer having the structure shown in FIGS. 7 and 8 using the same size and material for the cylindrical portion 6a and the permanent magnets 4, 9a, 9b of the rotor 6, and FIGS. A similar test was conducted for the eddy current type speed reducer having the above structure.
The former is referred to as a specimen No. 4, the latter is the test piece No. 5 is assumed.
The test piece No. 1 to No. 5 is the switch board 23
Had the same outer diameter of 378 mm.

The measurement results are shown in Table 1 below. From Table 1, it can be seen that the test piece No. of the present invention example. 1 to No. Specimen No. 3 is a comparative example. 4 and No. 4. It can be seen that the braking force is larger than that of No. 5. Further, the test piece No. of the present invention example. 1 to No. 3 is the switch plate 23 and the non-magnetic material 2
2 are alternately overlapped in the axial direction of the rotating shaft 1 and fixed with bolts 28 to form the outer peripheral side of the case 21. Therefore, the test piece No. which is a comparative example manufactured by casting. 4 and N
o. 5, the manufacturing time is shortened, and the cost can be reduced. In addition, the test piece No. which is a comparative example. 5 is the rotating shaft 1
Can be slightly shorter than that of the example of the present invention, but is significantly inferior to the example of the present invention in terms of braking torque, manufacturing time, and manufacturing cost.

[0038]

[Table 1]

In this embodiment, the pole piece is not mounted on the outer periphery of the permanent magnet row 25. However, the pole piece may be mounted. Further, in the present embodiment, an example using a permanent magnet has been described, but an example using an electromagnet may be used.

[0040]

As described above, in the eddy current type speed reducer of the present invention, the magnet rows having the same polarity provided around the support ring made of a ferromagnetic material are reversed in the axial direction of the rotating shaft. Since a plurality of rows are alternately arranged, the amount of magnets that can be arranged in the same volume can be increased, and a high braking force can be obtained without increasing the overall size of the device. Also,
In the eddy current type speed reducer of the present invention, since the switch plate and the non-magnetic material are both cylindrical with the same diameter, for example, the switch plate and the non-magnetic material are alternately arranged in the axial direction of the rotating shaft and fixed by bolts. In addition, the outer peripheral side of the case can be formed, so that the manufacturing time can be reduced and the cost can be reduced as compared with a conventional apparatus manufactured by casting. Further, in the eddy current type speed reducer of the present invention, the number of parts is smaller than that proposed in Japanese Patent Publication No. 7-118901,
The manufacturing time can be reduced and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part of an eddy current type speed reducer of the present invention, and is a cross-sectional view in a rotation axis direction.

FIG. 2 is a perspective view illustrating an array of magnets constituting the eddy current type speed reducer of the present invention.

FIG. 3 is an explanatory view of an eddy current type speed reducer according to the present invention corresponding to claim 2, wherein an upper half shows a brake ON state and a lower half shows a brake OFF state.

FIG. 4 is an explanatory view of an eddy current type speed reducer according to the present invention corresponding to claim 3, wherein an upper half shows a state where braking is ON, and a lower half shows a state where braking is OFF.

FIG. 5 is an explanatory view of an eddy current type speed reducer according to the present invention corresponding to claim 4, wherein an upper half shows a state where braking is ON, and a lower half shows a state where braking is OFF.

FIG. 6 is a diagram showing a magnet array constituting an eddy current type speed reducer according to the present invention;
It is a perspective view explaining a switch board.

FIG. 7 is a side view showing a cross section of an upper half of an eddy current type reduction gear proposed in Japanese Patent Application Laid-Open No. 1-234043, with braking ON.
It is explanatory drawing which shows the state.

FIG. 8 is a cross-sectional side view showing an upper half of an eddy current type reduction gear proposed in Japanese Patent Application Laid-Open No. 1-234043, and a braking OF is shown.
It is a figure showing the state of F.

FIGS. 9A and 9B are explanatory views showing the ON state of the braking of the eddy current type reduction gear proposed in Japanese Patent Publication No. Hei 7-118901, wherein FIG. 9A is a longitudinal sectional side view, and FIG.

FIG. 10 is an explanatory diagram showing a state of braking OFF of an eddy current reduction device proposed in Japanese Patent Publication No. Hei 7-118901, and FIG.
Is a vertical cross-sectional side view, and (b) is a vertical cross-sectional front view.

FIG. 11 is a perspective view illustrating a magnet row and a switch plate constituting the eddy current type speed reducer of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating shaft 6 Rotor 6a Cylindrical part 21 Case 22 Non-magnetic material 23 Switch plate 24 Support ring 25 Permanent magnet row 27 Air cylinder 28 Bolt 29 Ring

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shoka Ishida 5-1-1109 Shimaya, Konohana-ku, Osaka-shi Sumitomo Metal Industries Co., Ltd. Kansai Works Steelworks Business Unit, 5-1-1109, Shimaya, Konohana-ku, Ichigo Prefecture (Reference) 5H115 PA00 PA08 PC06 PG10 PU01 PU19 QE06 QI06 QI07 QI09 UI28 5H649 AA03 BB02 GG09 GG11 GG13 GG16 HH08 HH16 PP02 PP08 PP13

Claims (4)

[Claims] A rotor having a cylindrical portion made of a ferromagnetic material and integrally attached to a rotating shaft; and a rotor facing the inner peripheral surface of the cylindrical portion of the rotor at a predetermined interval, A plurality of cylindrical switch plates made of a ferromagnetic material fixed in series via a non-magnetic material, and a ferromagnetic material opposed to the inner peripheral surface of these switch plates at a predetermined interval. And a permanent magnet or an electromagnet array having the same polarity along the circumferential direction of the rotor, and the permanent magnet or the electromagnet array is arranged in the axial direction of the rotating shaft. An eddy current type speed reducer, wherein a plurality of rows are provided so as to have opposite polarities. 2. A plurality of permanent magnets or electromagnet trains having the same polarity along the circumferential direction of the rotor are provided in a plurality of rows so as to have opposite polarities in the axial direction of the rotating shaft. The eddy current type reduction gear according to claim 1, wherein the reduction gear is provided so as to be capable of being provided. 3. A plurality of cylindrical switch plates made of a ferromagnetic material fixed in series via a non-magnetic material so as to be able to advance and retreat in the axial direction of the rotating shaft. 1
An eddy current type reduction gear according to the above description. 4. An inner side wall surface of a case, which covers a row of permanent magnets or electromagnets having the same polarity along the circumferential direction of the rotor, is provided in a plurality of rows so as to have opposite polarities in the axial direction of the rotating shaft. A ring made of a ferromagnetic material is provided so as to be in contact with the switch plate, and the support ring is divided for each permanent magnet or electromagnet row, and each of the divided support rings is in contact with each other and is made of the ferromagnetic material. 2. The eddy current type reduction gear according to claim 1, wherein the eddy current type reduction gear is provided so as to be movable in an axial direction of the rotation shaft between positions in contact with the ring.