JP2000324792A - Eddy-current reduction gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a bending load from being generated in a rotor by driving torque being transmitted to the rotor via a ring gear, and to improve the durability of a bearing by providing the bearing for rotatably supporting the part to be supported of the rotor to a carrier at both the sides of the ring gear. SOLUTION: A carrier 20 is provided, where the carrier 20 composes an amplification mechanism being provided on the outer periphery of a flange 13 being mounted to an output shaft 11 of a speed regulator 10 by engaging in spline and a nut 12. A rotor 30 is rotatably provided on the outer-periphery surface of the carrier 20 via bearings 25a and 25b. Then, when the speed of the rotor 30 is increased, the carrier 20 is also rotated at the rotational speed of approximately 1/1.5 to 1/2 times that of the rotor 30, thus setting the relative speed difference between the carrier 20 and the rotor 30 to approximately 1/1.5 to 1/2 as compared with a conventional case, improving the durability of the bearing 25a and 25b, and preventing a bending load from being generated in the rotor 30 by driving torque being transmitted to the rotor 30 via a ring gear 52.

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 for assisting a foot brake as a main brake of a vehicle and for applying a deceleration braking to the vehicle.

[0002]

2. Description of the Related Art When a vehicle goes down a long slope, it is necessary to continuously apply a braking force to the vehicle in order to suppress the acceleration occurring in the vehicle. This braking force is applied only by a foot brake which is a main brake. When applied, the brake lining will burn and burn. In order to solve such problems, large vehicles have been equipped with exhaust brakes and used as auxiliary brakes on downhill slopes, etc. At present, it is not possible to obtain a great braking force. Therefore, an eddy current type speed reduction device has been proposed as a deceleration braking device (retarder) for decelerating or limiting the traveling speed of the vehicle when the vehicle is going downhill, and is put into practical use.

An eddy current type speed reducer is disclosed, for example, in Japanese Patent Publication No. 6-1.
No. 4782. Tokiko 6-1478
The eddy current type speed reducer disclosed in Japanese Patent Publication No. 2 is equipped with a drum-shaped rotor mounted on an output shaft of a transmission mounted on a vehicle, and a plurality of permanent magnets at equal intervals in a circumferential direction. An annular magnet means, and an actuator for bringing the magnet means close to the rotor to selectively actuate a braking position where the magnet means exerts a magnetic field on the rotor and a braking position where the magnet means exerts no magnetic field on the rotor by separating the magnet means from the rotor; When the magnet means is positioned at the braking position by the actuator, the braking operation is performed, and when the permanent magnet is positioned at the braking release position, the braking operation is released.

The braking capacity of the eddy current type speed reducer as described above is proportional to the magnetic force of the magnet, the diameter of the rotor, and the number of revolutions of the rotor, and varies depending on the material of the rotor. Since the diameter of the rotor is limited by the mounting space of the vehicle, there is a limit in increasing the diameter. Further, the rotation speed of the rotor is regulated by the rotation speed of the rotation shaft connecting the rotor. For this reason, the conventional eddy current type speed reducer has attempted to improve the braking ability by increasing the magnetic force of the magnet or selecting the material of the rotor. However, when the braking force is increased, the amount of heat generated by the rotor increases, causing a problem in the cooling performance of the rotor, and it is impossible to dramatically improve the braking ability.

[0005] In order to solve the above-mentioned problem, the present applicant has arranged a speed increasing mechanism comprising a planetary gear mechanism between a rotating shaft and a rotor to increase the rotating speed of the rotor from the rotating speed of the rotating shaft. An eddy current type speed reducer capable of improving the braking capacity and improving the cooling efficiency of the rotor has been proposed as Japanese Patent Application No. 10-102016.

[0006]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application No. Hei.
The speed increasing mechanism comprising a planetary gear mechanism in the eddy current type reduction gear of No. 0-102016 has a sun gear mounted on a fixed member, a ring gear mounted on a rotor, and a planetary gear meshing with the ring gear and the sun gear. This is a configuration attached to a rotating shaft. In the speed increasing mechanism having such a configuration, the rotor is rotatably supported by the fixed member. Therefore, the planetary gear mechanism is arranged on the side of the bearing provided between the rotor and the fixed member. Configuration. Accordingly, since the driving torque is transmitted to the rotor at a position where the bearing is overhanged, a bending load generated on the rotor acts on the bearing, so that durability of the bearing becomes a problem. Further, in the speed increasing mechanism, since the rotor is rotatably supported by the fixed member, the relative speed difference between the increased speed rotor and the fixed member is large. The durability of the disposed seal becomes a problem.

The present invention has been made in view of the above-mentioned circumstances, and a first technical problem is to provide an eddy current type equipped with a speed increasing mechanism capable of improving the durability of a bearing for rotatably supporting a rotor. It is to provide a reduction gear.

A second technical object of the present invention is to provide an eddy current type speed reducer having a speed increasing mechanism capable of improving the durability of a seal provided between a rotor and a fixed member. It is in.

[0009]

According to the present invention, there is provided a rotor driven by a rotating shaft and a plurality of magnets disposed opposite to the rotor. And a speed increasing mechanism for speeding up the driving force of the rotating shaft and transmitting the driving force to the rotor, wherein the speed increasing mechanism is mounted on a fixed member. A sun gear, a ring gear mounted on a supported portion of the rotor, a carrier mounted on the rotating shaft, and a planetary gear mounted on the carrier and meshing with the sun gear and the ring gear. An eddy current type speed reducer is provided, wherein bearings for rotatably supporting a supported portion of the rotor on the carrier are provided on both sides of the ring gear.

In order to solve the second technical problem, according to the present invention, there is provided a rotor driven by a rotating shaft, and a magnet having a plurality of magnets disposed opposite to the rotor. Means, a speed increasing mechanism for speeding up the driving force of the rotating shaft and transmitting the driving force to the rotor, wherein the speed increasing mechanism comprises a sun gear mounted on a fixed member, A ring gear mounted on a supported portion of the rotor, a carrier mounted on the rotating shaft, and a planetary gear mounted on the carrier and meshing with the sun gear and the ring gear; Wherein a seal is provided between the supported portion and the carrier, and a seal is provided between the carrier and the fixing member. You.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an eddy current speed reducer constructed in accordance with the present invention.

FIG. 1 is a sectional view showing an eddy current type speed reducer constructed according to the present invention mounted on an output shaft of a transmission mounted on a vehicle. The eddy current type speed reducer in the illustrated embodiment, a carrier 20 constituting a speed increasing mechanism described later provided on an outer periphery of a mounting flange 13 which is spline-fitted to an output shaft 11 of a transmission 10 and mounted by a nut 12. I have it. This carrier 2
Reference numeral 0 denotes a first portion 21 formed integrally with the mounting flange 13 in the illustrated embodiment, and a second portion 22 formed annularly separately from the first portion 21. The first part 21 and the second part 22 are connected by fastening bolts 23.

A rotor 30 is rotatably disposed on the outer peripheral surface of the carrier 20 thus configured via bearings 25a and 25b. Therefore, the carrier 20 functions as a rotor support member that rotatably supports the rotor 30. The rotor 30 includes an annular supported portion 31, an end wall 32 extending upward from a right end of the supported portion 31 in the drawing, and an annular braking portion attached to an upper end of the end wall 32 by a fixing means such as welding. 33 to form a drum. The rotor 30 is configured such that the supported portion 31 is the first portion 2 of the carrier 20 as a rotor support member.
The first and second portions 22 are fitted to bearings 25a and 25b provided on the outer peripheral surfaces thereof, respectively, and rotatably supported. The braking portion 33 is made of a magnetic material, and has a plurality of radiation fins 34 mounted on an outer peripheral surface thereof.

The eddy current type speed reducer in the illustrated embodiment increases the driving force of the carrier 20 attached to the output shaft 11 and transmits the driving force to the rotor 30.
Is provided. The speed increasing mechanism 50 is configured by a planetary gear mechanism having a sun gear 51, a ring gear 52, and a planetary gear 53. The sun gear 51 is non-rotatably mounted on a mounting member 61 of a magnet housing 60 that houses a magnet unit 70 described below mounted on a case 15 of the transmission 10 as a fixed member by a nut 16. The ring gear 52 is connected to the supported portion 3 of the rotor 30.
1 is provided at a central portion in the axial direction (the left-right direction in FIG. 1), that is, at an inner peripheral surface between the bearings 25a and 25b so as to face the sun gear 51. The planetary gear 53
The carrier 20 is rotatably supported by a support shaft 55 disposed between the first part 21 and the second part 22 of the carrier 20, and meshes with the sun gear 51 and the ring gear 52. As described above, in the speed increasing mechanism 50 in the illustrated embodiment, the bearing 25 a and the bearing 25 b that rotatably support the supported portion 31 of the rotor 30 on the carrier 20 are arranged on both sides of the ring gear 52.

In FIG. 1, the right end of the supported portion 31 of the rotor 30 and the first portion 21 of the carrier 20 are shown.
Is provided with a seal 41. A seal 42 is provided between the left end of the supported portion 31 of the rotor 30 in FIG. 1 and the second portion 22 of the carrier 20. Then, the second portion 22 of the carrier 20 and the fixing member 6 of the magnet housing 60 as a fixing member are fixed.
1, a seal 43 is provided. The seals 41, 42 and 43 are for preventing lubricating oil in the transmission 10 acting on the speed increasing mechanism 50 and the bearings 25a and 25b from scattering to the outside.

The speed increasing mechanism 50 in the illustrated embodiment is configured as described above, and the driving force transmitted to the mounting flange 13 mounted on the output shaft 11 is transmitted through the carrier 20 and the support shaft 55 to the planets. Transmitted to the gear 53,
The planetary gear 53 drives the ring gear 52 while revolving along the outer periphery of the sun gear 51 and rotating. As a result, the rotor 30 to which the ring gear 52 is attached is driven to rotate at a rotation speed of about 1.5 to 2 times the rotation speed of the carrier 20, that is, the output shaft 11. In this manner, the speed of the rotor 30 is increased, but the carrier 20 rotatably supporting the rotor 30 is also rotating at a rotation speed of about 1 / 1.5 to 1/2 of that of the rotor 30, so that both of them are rotated. Since the relative speed difference is about 1 / 1.5 to 1/2 as compared with the conventional one in which the rotor 30 is supported by the fixed member, the bearing 25a provided between the carrier 20 and the rotor 30 has The durability of the bearing 25b can be improved. Since the bearings 25a and 25b are arranged on both sides of the ring gear 52, no bending load is generated on the rotor 30 by the driving torque transmitted to the rotor 30 via the ring gear 52. The durability of the bearings 25a and 25b is improved.

As described above, the relative speed difference between the rotor 30 and the carrier 20 is smaller than that of the conventional one in which the rotor 30 is supported by a fixed member.
41 and 4 disposed between the carrier and the carrier 20
2 improves durability. Further, since the relative speed difference between the carrier 20 and the fixed member is smaller than the relative speed difference between the rotor 30 and the fixed member after the speed increase, the second portion 22 of the carrier 20 and the magnet as the fixed member The durability of the seal 43 provided between the housing 60 and the mounting member 61 can be improved. That is, in the illustrated embodiment, the sealing means provided between the supported portion 31 of the rotor 30 and the fixed member is replaced by seals 41 and 42 provided between the rotor 30 and the carrier 20; Carrier 20
And the seal 43 disposed between the fixing member and the fixing member, and the peripheral speed of each is reduced, so that the life of these seals can be greatly extended.

Next, a description will be given of the magnet housing 60 disposed opposite to the braking portion 33 of the rotor 30 and the magnet means 70 accommodated in the magnet housing 60. The magnet housing 60 includes a mounting member 61 and a hollow annular housing main body 62 integrally formed on the outer periphery of the mounting member 61. The attachment member 61 is formed in a disk shape, and the inner peripheral end thereof is attached to the case 15 of the transmission 10 by a fastening bolt 16. The hollow annular housing body 62 includes an inner peripheral wall 621, an outer peripheral wall 622, a right end wall 623, and a left end wall 62.
4 and an outer peripheral wall 622 in the figure, an intermediate wall 625 protruding upward from the left end.
2 is disposed facing the inner peripheral surface of the annular braking portion 33 of the rotor 30 with a small gap. Outer peripheral wall 622 and right end wall 6 constituting housing body 62
23 is made of a non-magnetic material such as aluminum, which is a magnetic insulating material, and has an outer peripheral wall 622 as shown in FIG.
As shown in the figure, a plurality of windows 6 are arranged at predetermined intervals in the circumferential direction.
22a are formed. A pole piece 626 made of a ferromagnetic material is provided in the plurality of windows 622a. Preferably, the pole piece 626 is
Cast during molding. The right end wall 623 and the intermediate wall 6
A cover plate 627 is attached to the upper end of the bracket 25 by mounting bolts 628.

The magnet means 70 is disposed with the inner peripheral surface fitted to the outer peripheral surface of the inner peripheral wall 621, respectively.
The first magnet support cylinder 71 and the second magnet support cylinder 7 arranged at positions facing the pole piece 626 mounted on the
2 is provided. The first magnet support cylinder 71 is formed of a magnetic material, and is fixed to the right end wall 623 by a fixing pin 629. Second magnet support cylinder 72
Is mounted on its lower surface with a cylindrical sliding member 630 coated on its lower surface with, for example, Teflon (trade name) which is a material having a small friction coefficient on stainless steel. It is arranged so that it can slide on the surface in the circumferential direction. The first magnet support cylinder 7
A first permanent magnet group including a plurality of permanent magnets 73 provided at a position facing the pole piece 626 is mounted on an outer peripheral surface of the first permanent magnet 73. This permanent magnet 73 is
Inner surface joined to the magnet support cylinder 71 of the pole piece 626
The outer surface opposite to the magnetic pole is a magnetic pole, and the polarity of the outer surface is N
The poles and the S poles are arranged alternately. Also, a plurality of permanent magnets disposed on the outer peripheral surface of the second magnet support cylinder 72 at the same interval as the interval between the plurality of permanent magnets 73 constituting the first permanent magnet group. A second group of permanent magnets consisting of magnets 74 is mounted. Also in this permanent magnet 74, the inner surface joined to the second magnet support cylinder 72 and the outer surface facing the pole piece 626 are magnetic poles,
The polarities of the outer surface are arranged such that N poles and S poles alternate. The permanent magnets 73 and 74 constituting the first and second permanent magnet groups are made of a rare earth element such as neodymium which is lightweight and has a strong magnetic force.

The second magnet support cylinder 72 has the structure shown in FIG.
, An arm 75 is attached to the left end. This arm 75 is connected to a magnet actuating actuator (not shown). An unillustrated magnet operation actuator causes the second magnet support cylinder 72 to slide on the outer peripheral surface of the inner peripheral wall 621 in the circumferential direction. The amount of actuation of the second magnet support cylinder 72 by the magnet actuation actuator is equivalent to one pitch of the plurality of permanent magnets 74 constituting the second permanent magnet group disposed on the second magnet support cylinder 72. Is set.

The eddy current type speed reducer in the illustrated embodiment is configured as described above, and its operation will be described below. First, the braking operation will be described. The second magnet support cylinder 7 is driven by a magnet actuating actuator (not shown).
2 are rotated in one direction, and the respective permanent magnets 73 of the first permanent magnet group mounted on the outer peripheral surface of the first magnet support cylinder 71.
The respective permanent magnets 74 of the second permanent magnet group mounted on the outer periphery of the second magnet support cylinder 72 adjacent to the respective permanent magnets 73 are positioned in the same polarity state as shown in FIG. Then, a braking action is performed.

FIGS. 3 and 4 show the braking action.
This will be described with reference to FIG. As shown in FIGS. 3 and 4, each of the permanent magnets 73 of the first permanent magnet group attached to the outer peripheral surface of the first magnet support cylinder 71 and the outer periphery of the second magnet support cylinder 72 are attached. Each of the permanent magnets 74 of the second permanent magnet group has N poles and S poles arranged alternately along the circumferential direction of the braking portion 33 of the rotor 30, and thus is adjacent to the braking portion 33 in the circumferential direction. The outer peripheral wall 622 of the housing body 62 formed of a non-magnetic material and disposed between the first and second permanent magnet groups and the second permanent magnet group and the braking unit 33 is formed.
Piece 6 made of ferromagnetic material magnetically insulated by
26 is a magnetic path and is magnetically connected to the braking section 33 of the rotor 30. As a result, the magnetic circuits 77 and 77 passing through the first magnet support cylinder 71 and the second magnet support cylinder 72 on the fixed side and the braking section 33 of the rotor 30 on the rotation side.
Is formed. Therefore, an eddy current is generated on the inner peripheral surface of the braking unit 33 due to a relative speed difference between the first magnet supporting cylinder 71 and the second magnet supporting cylinder 72 and the braking unit 33 of the rotor 30, and the braking unit 33 receives the braking torque. .

At the time of braking, the rotor 30 is driven to rotate at a rotation speed of about 1.5 to 2 times the rotation speed of the output shaft 11 by the action of the speed increasing mechanism 50 as described above. When the permanent magnets 73 and 74 have the same magnetic force as compared with the shaft directly connected to the shaft 11, a braking torque about 2 to 4 times is obtained. Although the amount of heat generated by the rotor 30 increases due to the increase in the braking torque, the rotor 30
The radiation fins 34 mounted on the rotor 30 also connect the rotor 30 to the output shaft 11.
Since the rotor 30 is rotated at a rotation speed of about 1.5 to 2 times as compared with that directly connected to the rotor, the cooling efficiency of the rotor 30 is also about 1.5 to 2 times, and overheating of the rotor 30 can be prevented.

Next, the braking release operation will be described. From the state shown in FIGS. 3 and 4, the second magnet support cylinder 72 is operated in the other direction by a magnet operation actuator (not shown) to rotate the second magnet support cylinder 72 in the other direction. Then, each of the permanent magnets 73 of the first permanent magnet group mounted on the outer peripheral surface of the first magnet support cylinder 71 and the outer periphery of the second magnet support cylinder 72 adjacent to each of the permanent magnets 73 are mounted. When the respective permanent magnets 74 of the second permanent magnet group are positioned in different polarities as shown in FIG. 5, the braking action is released.

Hereinafter, the reason why the braking operation is released will be described with reference to FIGS. As shown in FIGS. 5 and 6, each of the permanent magnets 73 of the first permanent magnet group mounted on the outer peripheral surface of the first magnet support cylinder 71 and the second magnet adjacent to each of the permanent magnets 73 Since the respective permanent magnets 74 of the second permanent magnet group mounted on the outer periphery of the support cylinder 72 have mutually different polarities, the pole piece 6
A magnetic short circuit 78 that is magnetically connected through the pole piece 26 and passes through the pole piece 626 is formed. Therefore, the rotor 3
The magnetic field vertically acting on the inner surface of the zero braking unit 33 is extremely weak, and no braking torque is generated in the braking unit 33, and the braking action is released.

Next, another embodiment of the eddy current type speed reducer constructed according to the present invention will be described with reference to FIGS. The eddy current type speed reducer in the embodiment shown in FIGS. 7 and 8 differs from the embodiment shown in FIGS. 1 to 6 in that the magnet housing 60 and the magnet means 70 housed in the magnet housing 60 are different from those in the embodiment shown in FIGS. Since other configurations are substantially the same as those of the embodiment shown in FIGS. 1 to 6, the same members are denoted by the same reference numerals, and detailed description thereof will be omitted. The magnet housing 60 in the eddy current type speed reducer shown in FIGS. 7 and 8 faces the outer peripheral wall 622 a constituting the hollow annular housing main body 62, that is, the inner peripheral surface of the annular braking portion 33 constituting the rotor 30. Outer peripheral wall 62
2a is formed of a thin plate made of a non-magnetic material. The outer peripheral wall 622a is made of, for example, austenitic stainless steel, aluminum, heat-resistant synthetic resin,
0.5 to 1.0 thickness depending on carbon material containing reinforcing fiber
It is formed in a cylindrical shape of about mm, and is connected by a right end wall 623 and an intermediate wall 625 constituting the housing main body 62 by fixing means such as bolts. As described above, in the eddy current type speed reducer shown in FIGS. 7 and 7, the outer peripheral wall 622a constituting the housing main body 62 is formed by a thin plate made of a non-magnetic material.
The pole piece 626 in the embodiment shown in FIG.

The magnet means 70 is mounted on the housing body 62.
And a magnet support cylinder 72a made of a ferromagnetic material whose inner peripheral surface is fitted to the outer peripheral surface of the inner peripheral wall 621, which is slidable in the axial direction (left-right direction in FIG. 7). It is arranged in. A permanent magnet group including a plurality of permanent magnets 74a is mounted on the outer peripheral surface of the magnet support cylinder 72a in the circumferential direction. The permanent magnet 74a has magnetic poles on the inner surface joined to the magnet support cylinder 72a and the outer surface facing the inner peripheral surface of the annular braking portion 33 constituting the rotor 30 via the outer peripheral wall 622a. Polarity is N pole and S
The poles are arranged alternately. The magnet support cylinder 72a has an operating rod 75a at the left end in FIG.
Is attached. This operating rod is connected to a magnet operating actuator (not shown).

The eddy current type speed reducer shown in FIGS. 7 and 8 is configured as described above, and its operation will be described. As described above, the rotor 30 is driven to rotate at a rotation speed of three times or more the rotation speed of the output shaft 11 by the action of the speed increasing mechanism 50. When braking is performed by an eddy current type reduction gear, a magnet (not shown) is used. The actuation actuator is actuated to move the magnet support cylinder 72a and the permanent magnet 74a in FIG.
When the brake is positioned at the braking position indicated by the solid line in FIG. That is, the magnet support cylinder 72a and the permanent magnet 7
When the motor 4a is positioned at the braking position, the permanent magnet 74a is moved to the rotor 3
A magnetic field is applied to the annular braking portion 33 constituting the magnetic member 77, and a magnetic circuit 77a is formed between the braking portion 33 and the magnet support cylinder 72a as shown in FIG. Therefore, the rotating braking unit 33
When the vehicle crosses the magnetic field, an eddy current is generated in the braking unit 33, and the braking unit 33 receives a braking torque. Since the rotor 30 is driven to rotate at a rotation speed of about 1.5 to 2 times the rotation speed of the output shaft 11 by the action of the speed increasing mechanism 50 as described above, the rotor 30 is directly connected to the output shaft 11. Approximately 2 to 4 times the braking torque is obtained.

Next, a case where the braking is released will be described. In the braking state shown by the solid line in FIG.
The permanent magnet 74a is positioned at a braking release position indicated by a two-dot chain line in FIG. When the magnet support cylinder 72a and the permanent magnet 74a are positioned at the braking release position, the permanent magnet 74a does not face the annular braking unit 33 that forms the rotor 30, so that the braking unit 33 receives no braking torque.

As described above, the present invention has been described based on the illustrated embodiments. However, the present invention is not limited to only the embodiments, and various modifications are possible within the technical idea of the present invention. For example, in the illustrated embodiment, the magnet device 7
Although an example in which a permanent magnet is used as 0 has been described, an electromagnet may be used.

[0031]

Since the eddy current type speed reducer according to the present invention is constructed as described above, the following effects can be obtained.

That is, according to the present invention, the speed increasing mechanism for increasing the driving force of the rotating shaft and transmitting the driving force to the rotor includes a sun gear mounted on a fixed member and a ring mounted on a supported portion of the rotor. It consists of a gear, a carrier attached to a rotating shaft, and a planetary gear mounted on the carrier and meshing with a sun gear and a ring gear. On both sides of the ring gear, the supported part of the rotor is rotatably supported by the carrier. Since the bearing is provided, a bending load is not generated on the rotor by the driving torque transmitted to the rotor via the ring gear, so that the durability of the bearing can be improved.

Further, according to the present invention, the speed increasing mechanism for increasing the driving force of the rotating shaft and transmitting the driving force to the rotor comprises a sun gear mounted on a fixed member and a ring mounted on a supported portion of the rotor. Gears, a carrier attached to the rotating shaft, and a planetary gear mounted on the carrier and meshing with the sun gear and the ring gear, and a seal is provided between the supported portion of the rotor and the carrier. In addition, since the seals are provided between the carrier and the fixing member, each of these seals has a lower peripheral speed as compared with the conventional seal provided between the rotor and the fixing member. Therefore, the life of the seal can be significantly extended.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of an eddy current type speed reducer configured according to the present invention.

FIG. 2 is a partial perspective view showing a magnet housing and magnet means constituting the eddy current type speed reducer shown in FIG. 1;

FIG. 3 is a partial perspective view of a magnet unit in a braking state of the eddy current type speed reducer shown in FIG. 1;

FIG. 4 is a sectional view taken along line AA of the eddy current type reduction gear transmission shown in FIG. 1 in a braking state.

FIG. 5 is a partial perspective view of the magnet means in the non-braking state of the eddy current type speed reducer shown in FIG. 1;

FIG. 6 is a sectional view of a main part of the eddy current type speed reducer shown in FIG. 1 in a non-braking state.

FIG. 7 is a sectional view of a main part showing another embodiment of the eddy current type speed reducer configured according to the present invention.

FIG. 8 is a sectional view taken along the line BB of the eddy current type reduction gear transmission shown in FIG. 7 in a braking state.

[Explanation of symbols]

 Reference Signs List 10: Transmission 11: Transmission output shaft 20: Carrier 21: First part of carrier 22: Second part of carrier 30: Rotor 31: Supported part of rotor 32: End wall of rotor 33: End of rotor Braking unit 34: Heat radiation fins 41, 42, 43: Seal 50: Speed increasing mechanism 51: Sun gear 52: Ring gear 53: Planetary gear 60: Magnet housing 61: Mounting member for magnet housing 62: Housing body of magnet housing 626: Pole piece 70: Magnet means 71: First magnet support cylinder of magnet means 72: Second magnet support cylinder of magnet means 73, 74: Permanent magnet

Claims (2)

[Claims] 1. A rotor driven by a rotating shaft, magnet means disposed opposite to the rotor and having a plurality of magnets, and a driving force of the rotating shaft is increased and transmitted to the rotor. An eddy current type speed reducer comprising a speed increasing mechanism, wherein the speed increasing mechanism is attached to the rotating shaft, a sun gear mounted on a fixed member, a ring gear mounted on a supported portion of the rotor. And a planetary gear mounted on the carrier and meshing with the sun gear and the ring gear. On both sides of the ring gear, a supported portion of the rotor is rotatably supported by the carrier. An eddy current type speed reducer, wherein a bearing is provided. 2. A rotor driven by a rotating shaft, magnet means provided with a plurality of magnets disposed opposite to the rotor, and a driving force of the rotating shaft is increased to be transmitted to the rotor. An eddy current type speed reducer comprising a speed increasing mechanism, wherein the speed increasing mechanism is attached to the rotating shaft, a sun gear mounted on a fixed member, a ring gear mounted on a supported portion of the rotor. And a planetary gear mounted on the carrier and meshing with the sun gear and the ring gear. A seal is provided between the supported portion of the rotor and the carrier. An eddy current type reduction gear, wherein a seal is provided between the carrier and the fixing member.