JPH0634006A - Magnetic frictional roller type decelerator - Google Patents

Abstract

PURPOSE:To dispense with a complicated press-contact mechanism between rollers, reduce a size, prevent abrasion, and obtain a certain transmitting for a long time with the movement of the roller even when it is abraded. CONSTITUTION:An output shaft 3 is supported to a fixed bearing body 1 having an iron ring 2. An input shaft 4 provided with a disc 5 is supported opposedly to the output shaft 3. An iron ring 6 is provided on the disc 5, and a steel ball 7 is arranged between the iron rings 2 and 6. A carrier 4 having discs 8, 9 is fixed to the shaft 3. Cutouts 12 are formed on the outer edge of the discs 8, 9, while a roller shaft 13 is supported thereby. A planetary magnetic frictional roller 14 is fixed to one end of the shaft 13, while a planetary magnetic frictional roller 15 is fixed to the other end thereof. The roller 14 is in contact with an inner periphery of the iron ring 2 in a rotatable manner, while the roller 15 is in contact with an inner periphery of the iron ring 6 in a revoluting manner. When contact surfaces of the rollers 14, 15 and the rings 2, 6 are abraded, the shaft 13 is moved in a diameter direction by magnetic attraction force so as to keep a proper contact condition therebetween.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary roller speed reducer using a transmission mechanism in which a planetary magnetic friction roller using a permanent magnet is brought into contact with an iron annular rolling surface so as to rotate and revolve. .

[0002]

2. Description of the Related Art Conventionally, instead of a gear combination mechanism,
A planetary speed reducer in which a friction roller is combined is known (for example, JP-A-1-203798). In a conventional planetary friction roller type speed reducer, for example, in order to obtain a reliable transmission between the planetary friction roller and the sun friction roller, both are elastically pressed and a viscous oil is interposed between them. ing. Therefore, a complicated elastic pressure contact mechanism is required, and maintenance management such as regular lubrication is required. Further, there is a problem that abrasion is likely to occur due to the pressure contact between the friction rollers.

[0003]

Therefore, the present invention does not require a complicated elastic pressure contact mechanism between the rollers, can obtain a sufficient transmission without oiling, and is less likely to cause abrasion of the rollers. It is an object of the present invention to provide a magnetic friction roller type speed reducer that automatically maintains a proper roller contact state even when a problem occurs.

[0004]

According to the present invention, in order to solve the above-mentioned problems, a bearing body 1 fixed to a support S is provided.
, The first iron ring 2 having a large inner diameter is fixed to the output shaft 3, the output shaft 3 is rotatably supported, and the input shaft 4 is arranged so that the output shaft 3 is aligned with the shaft center. , The disk 5 facing the bearing body 1 in parallel is fixed.
A second iron ring 6 having a small inner diameter is fixedly attached to the plurality of steel balls 7 between the first and second iron rings 2 and 6 facing each other.
A carrier 10 having a pair of disks 8 and 9 opposed to each other in parallel to the axial direction is fixed to the output shaft 3 so as to be rotatable relative to each other. Providing a plurality of notch grooves 11 and 12 extending radially at a position,
A roller shaft 13 is rotatably supported in the notched grooves 11 and 12 and is movable in the radial direction, and one end of the roller shaft 13 is rotatably and revolvingly contacted with the inner circumference of the first iron ring 2. The first planetary magnetic friction roller 14 having a large diameter is fixed, and the second planetary magnetic friction roller 15 having a small diameter that is rotatably and rotatably contacted with the inner circumference of the second iron ring 6 is fixed to the other end side. 1 Planetary Magnetic Friction Roller 14-First Iron Ring 2-Steel Ball 7-Second Iron Ring 6-
A magnetic circuit is formed which is connected to the second planetary magnetic friction roller 15, and when the mutual contact surfaces of the first and second planetary magnetic friction rollers 14 and 15 and the first and second iron rings 2 and 6 are worn, The magnetic attraction force relatively moves the roller shaft 13 in the radial direction to maintain the proper contact state of the first and second planetary magnetic friction rollers 14 and 15 with the first and second iron rings 2 and 6. A magnetic friction roller type speed reducer was constructed. Further, as shown in FIG. 4, a bearing 21 is fixed to the support S by fixing a disc 21 to one end of the output shaft 23 and fixing a first iron ring 22 having a large inner diameter to the disc 21. 25, a second iron ring 26 with a small inner diameter
The input shaft 24 is rotatably supported with the output shaft 23 aligned with the output shaft 23, and a plurality of steel balls 27 are interposed between the first and second iron rings 22 and 26 facing each other. A carrier 30 having a pair of discs 28 and 29 opposed to each other in parallel to the axial direction is fixed to the input shaft 24. The outer periphery of the pair of discs 28 and 29 is radially arranged at the opposing position. Is provided with a plurality of notch grooves 31, 32, and the roller shaft 33 is supported in the notch grooves 31, 32 rotatably and movably in the radial direction. A first planetary magnetic friction roller 34 having a large diameter is attached to the inner circumference of the iron ring 22 so as to freely rotate and revolve, and a small diameter of the second planetary magnetic friction roller 34 that is rotatably and freely contacted with the inner circumference of the second iron ring 26 is provided at the other end. Second planetary magnetic friction roller 35
And the first planetary magnetic friction roller 34-first
Iron ring 22-steel ball 27-second iron ring 26-forms a magnetic circuit connected to the second planetary magnetic friction roller 35, and first and second planetary magnetic friction rollers 34,
35, when the mutual contact surfaces of the first and second iron rings 22 and 26 are worn, the magnetic attraction force causes the roller shaft 33 to rotate.
Of the first and second planetary magnetic friction rollers 3 with respect to the first and second iron rings 22 and 26 by moving them relative to each other in the radial direction.
The magnetic friction roller type speed reducer was constructed so as to maintain the proper contact state of 4, 35.

[0005]

In the first magnetic friction roller type speed reducer of the present invention, the planetary magnetic friction rollers 14 and 15 are magnetically attracted to the iron rings 2 and 6, respectively. Since the disk 5 rotates together with the input shaft 4, the second planetary magnetic friction roller 15 having a small diameter is used.
Rotates around the inner circumference of the iron ring 6. The first planetary magnetic friction roller 14 and the second planetary magnetic friction roller 15 revolve around the inner circumference of the first iron ring 2 while revolving. Therefore, the output shaft 3 rotates together with the carrier 10. When the planetary magnetic friction rollers 14 and 15 or the iron rings 2 and 6 are worn, the roller shaft 13 is automatically moved in the notch grooves 11 and 12 in the radial direction due to the magnetic attraction force between the two, and the magnetic force between the two is generated. Maintain proper contact. Therefore, a complicated elastic pressure contact mechanism between the rollers 14 and 15 and the iron rings 2 and 6 can be omitted, and sufficient deceleration and transmission can be obtained without oil supply. In the first magnetic friction roller type speed reducer of the present invention, when the input shaft 24 rotates,
Along with this, the carrier 30 rotates. The planetary magnetic friction roller 35 in contact with the iron ring 26 rolls along the inner circumference of the iron ring 6 while revolving. The rotation of the planetary magnetic friction roller 35 is performed by rotating the planetary magnetic friction roller 34 through the shaft 33.
Be transmitted to. By the rotation of the planetary magnetic friction roller 34,
The iron ring 22 is pulled around, and the output shaft 23 rotates together with the disk 21. When the planetary magnetic friction rollers 34, 35 or the iron rings 22, 26 are worn, the roller shaft 33 is automatically moved in the notch grooves 31, 32 in the radial direction due to the magnetic attraction force between the two, so that the roller shaft 33 is moved between them. Maintain proper contact. Therefore, the rollers 34 and 35 and the iron ring 2
It is possible to obtain a sufficient speed reduction and power transmission without oiling, by omitting a complicated elastic pressure contact mechanism between the second and second wheels 26 and 26.

[0006]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view of a magnetic friction roller type speed reducer according to the present invention,
2 is a sectional view taken along line II-II in FIG. 1, FIG. 3 is an enlarged sectional view of a planetary magnetic friction roller, FIG. 4 is a sectional view of another magnetic friction roller type speed reducer according to the present invention, and FIG. 5 is another planetary magnetic field. It is an expanded sectional view of a friction roller.

In FIGS. 1 and 2, the bearing body 1 is fixed to the support S. A first iron ring 2 having a large inner diameter is fixed to the peripheral portion of the bearing body 1. An output shaft 3 is rotatably supported at the center of the bearing body 1. An input shaft 4 is arranged so that the output shaft 3 and the shaft center thereof coincide with each other. A disk 5 facing the bearing body 1 in parallel is fixed to the input shaft 4, and a second iron ring 6 having a small inner diameter is fixed to the disk 5. A plurality of steel balls 7 are provided between the first and second iron rings 2 and 6 facing each other.
Relative rotation is possible.

A carrier 10 having a pair of disks 8 and 9 facing each other in parallel to the axial direction is fixed to the output shaft 3. On the outer peripheral side of the disks 8 and 9, a plurality of notched grooves 11 and 12 radially extending are formed at opposing positions. The roller shaft 13 is rotatably attached to the notch grooves 11 and 12,
And it is supported so as to be movable in the radial direction. On one end side of the roller shaft 13, a large diameter first planetary magnetic friction roller 1 that contacts the inner circumference of the first iron ring 2 so as to rotate and revolve freely.
The second planetary magnetic friction roller 15 having a small diameter is fixed to the inner circumference of the second iron ring 6 so as to freely rotate and revolve.

As shown in FIG. 3, the planetary magnetic friction roller 1 is
Steel rings 18 and 19 are fixed to the outer circumferences of the permanent magnet rings 16 and 17, respectively. The planetary magnetic friction roller 14 and the planetary magnetic friction roller 15 are attracted to the iron rings 2 and 6 on the different magnetic pole sides. Therefore, the first planetary magnetic friction roller 14-the first iron ring 2-
A magnetic circuit connecting the steel ball 7-the second iron ring 6-the second planetary magnetic friction roller 15 is formed.

In this embodiment, however, the input shaft 4
When is rotated, the iron ring 6 is rotated via the disk 5. The planetary magnetic friction roller 15 contacting the iron ring 6 is
Rolls along the inner circumference of the iron ring 6 while revolving. The rotation of the planetary magnetic friction roller 15 is transmitted to the planetary magnetic friction roller 14 via the shaft 13. The planetary magnetic friction roller 14 revolves along with the inner periphery of the iron ring 2 while rotating around the carrier 10. Then, the output shaft 3 rotates together with the carrier 10. Angular velocity of iron ring 6: ω
6, the angular velocity of the carrier 10 is ω10, the inner circumference length of the iron ring 2 is Z2, the outer circumference lengths of the planetary magnetic friction rollers 14 and 15 are Z14 and Z15, and the inner circumference length of the iron ring 6 is Z6.
Then, the reduction ratio U in this case is

[Equation 1] Becomes First planetary magnetic friction roller 14-First iron ring 2-Steel ball 7-Second iron ring 6-Second
Since a magnetic circuit connected to the planetary magnetic friction roller 15 is formed, a strong magnetic attraction force between the planetary magnetic friction rollers 14 and 15 and the iron rings 2 and 6 is obtained. The steel rings 2 and 6 are attracted to each other via a steel ball 7. However, since the power transmission in this embodiment is due to the magnetic friction force, mechanical pressure contact between the planetary magnetic friction rollers 14 and 15 and the inner circumferences of the iron rings 2 and 6 on which they roll is unnecessary. Yes, refueling is not necessary. The overload is covered by the sliding of the planetary magnetic friction rollers 14,15. The outer circumferences of the planetary magnetic friction rollers 14 and 15 and the inner circumferences of the iron rings 2 and 6 are extremely small and can be used for a long period of time, but when these are worn, the planetary magnetic friction rollers 14 and 15 always have the shortest magnetic force. A magnetic attraction force is applied so as to form a circuit to approach the inner peripheral surfaces of the iron rings 2 and 6, and an appropriate contact state is automatically maintained.

In another embodiment of the present invention shown in FIG. 4, a disk 21 is fixed to one end of the output shaft 23.
A first iron ring 22 having a large inner diameter is fixed to the peripheral portion of the. The bearing body 25 is fixed to the support body S. A second iron ring 26 having a small inner diameter is fixed to the peripheral edge of the bearing body 25, and an input shaft 24 is rotatably supported in the center with the output shaft 23 and the shaft center aligned with each other. A plurality of steel balls 27 are provided between the first and second iron rings 22 and 26 facing each other, and are relatively rotatable. The input shaft 24 has a pair of disks 2 facing each other in parallel to the axial direction.
A carrier 30 having 8, 29 is fixed. A plurality of notched grooves 31 and 32 extending radially are formed at opposing positions on the outer peripheral sides of the pair of disks 28 and 29. The notched grooves 31 and 32 are rotatable and movable in the radial direction. Both ends of the roller shaft 33 are supported by. A large diameter first planetary magnetic friction roller 34 is fixed to one end of the roller shaft 33, and a second planetary magnetic friction roller 35 having a smaller diameter is fixed to the other end. The planetary magnetic friction roller 34 is in contact with the inner circumference of the first iron ring 22, and the planetary magnetic friction roller 35 is in contact with the inner circumference of the second iron ring so as to rotate and revolve. The structure of the planetary magnetic friction rollers 34 and 35 is the same as that shown in FIG. Therefore, the first planetary magnetic friction roller 34-the first iron ring 22-the steel ball 27-the second iron ring 2
6- A magnetic circuit connected to the second planetary magnetic friction roller 35 is formed.

In any of the embodiments, the planetary magnetic friction rollers 14, 15, 34 and 35 can have the structure shown in FIG. That is, in this case, the planetary magnetic friction rollers 14, 15, 34, 35 are made of iron, and the permanent magnet rings 16, 36 are sandwiched therebetween. Then, the planetary magnetic friction rollers 14, 34 and the planetary magnetic friction rollers 15, 3
5 is an iron ring 2, 22 on the magnetic pole side different from each other.
Adsorbed on 6,26.

In this embodiment, however, the input shaft 2
When the carrier 4 rotates, the carrier 30 rotates with it.
The planetary magnetic friction roller 35 in contact with the iron ring 26 rolls along the inner circumference of the iron ring 6 while revolving.
The rotation of the planetary magnetic friction roller 35 is transmitted to the planetary magnetic friction roller 34 via the shaft 33. Planetary magnetic friction roller 3
By the rotation of No. 4, the iron ring 22 is pulled around, and the output shaft 23 rotates together with the disc 21. In this case, the deceleration action is equivalent to that of the speed reducer shown in FIGS. When the planetary magnetic friction rollers 34, 35 or the iron rings 22, 26 are worn, the notch groove 3 is generated due to the magnetic attraction force between them.
The roller shafts 33 are automatically moved in the radial directions within the first and the second shafts 32 and 32 to maintain a proper contact state between them. Therefore, the complicated elastic pressure contact mechanism between the rollers 34 and 35 and the iron rings 22 and 26 is omitted, and sufficient deceleration is achieved without oiling.
Transmission is obtained.

[0014]

As described above, in the present invention, the first iron ring 2 having a large inner diameter is fixed to the bearing body 1 fixed to the support S, and the output shaft 3 is rotatably supported. An input shaft 4 is arranged with its axis aligned with the output shaft 3, and a disc 5 facing the bearing body 1 in parallel is fixed to the input shaft 4, and a second disc having a small inner diameter is attached to the disc 5. Iron rings 6 are fixed to each other, and a plurality of steel balls 7 are interposed between the first and second iron rings 2 and 6 facing each other to make them rotatable relative to each other. The output shaft 3 is parallel to the axial direction. A carrier 10 having a pair of discs 8 and 9 facing each other is fixed, and a plurality of radially extending notch grooves 11 and 12 are provided at opposing positions on the outer peripheral side of the pair of discs 8 and 9. The roller shaft 13 is rotatably supported by the rollers 11 and 12 and is movable in the radial direction. The first planetary magnetic friction roller 14 having a large diameter, which comes into contact with the inner circumference of the first iron ring 2 so as to rotate and revolve freely, is fixed to one end of the first iron ring 2, and the inner circumference of the second iron ring 6 is rotated to the other end. And a second planetary magnetic friction roller 15 having a small diameter which is rotatably in contact with the first planetary magnetic friction roller 14-first iron ring 2-steel ball 7
-Second iron ring 6-A magnetic circuit connected to the second planetary magnetic friction roller 15 is formed, and the first and second planetary magnetic friction rollers 14 and 15 and the first and second iron rings 2 and 6 are formed.
When the mutual contact surface with
The roller shaft 13 is relatively moved in the radial direction to move the first and second rollers.
The magnetic friction roller type speed reducer is configured to maintain the proper contact state of the first and second planetary magnetic friction rollers 14 and 15 with the iron rings 2 and 6, and the output shaft 23.
A disk 21 is fixed to one end side of the disk, a first iron ring 22 having a large inner diameter is fixed to the disk 21, and a bearing 25 fixed to the support S is attached to a second iron ring 26 having a small inner diameter. And the input shaft 24 is rotatably supported by aligning the output shaft 23 with the shaft center, and the first and second opposing faces
Carrier 3 having a plurality of steel balls 27 interposed between the iron rings 22 and 26 of FIG. 1 for relative rotation, and a pair of disks 28 and 29 facing the input shaft 24 parallel to each other in the axial direction.
0 is fixed, and a plurality of notched grooves 31 and 32 extending radially are provided at opposing positions on the outer peripheral side of the pair of disks 28 and 29. The notched grooves 31 and 32 are rotatably and radially arranged. The roller shaft 33 is movably supported, and the roller shaft 3
A large-diameter first planetary magnetic friction roller 34, which comes into contact with the inner circumference of the first iron ring 22 so as to freely rotate and revolve, is fixed to one end of the third ferrous ring 22, and to the inner circumference of the second ferrous ring 26 to the other end. The second planetary magnetic friction roller 35 of a small diameter which is rotatably and revolvably contacted is fixed, and the first planetary magnetic friction roller 34-
The first iron ring 22-steel ball 27-second iron ring 26-forms a magnetic circuit connected to the second planetary magnetic friction roller 35, and forms the first and second planetary magnetic friction rollers 34, 35 and the first and second planetary magnetic friction rollers 34, 35. When the mutual contact surfaces of the second iron rings 22 and 26 wear, the roller shaft 33 is relatively moved in the radial direction by the magnetic attraction force to move the first and second iron rings 22 and 26 relative to each other. Since the magnetic friction roller type speed reducer is configured so as to maintain the proper contact state of the planetary magnetic friction rollers 34 and 35 of No. 2, it does not require a complicated elastic pressure contact mechanism between the rollers and is sufficiently oil-free to be transmitted. Can be obtained, and the wear of the roller is less likely to occur,
Even if abrasion occurs, it has an effect of automatically becoming a proper roller contact state.

[Brief description of drawings]

FIG. 1 is a sectional view of a first magnetic friction roller type speed reducer according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an enlarged sectional view of a planetary magnetic friction roller.

FIG. 4 is a sectional view of a second magnetic friction roller type speed reducer according to the present invention.

FIG. 5 is an enlarged sectional view of another planetary magnetic friction roller.

[Explanation of symbols]

 1 bearing body 2 first iron ring 3 output shaft 4 input shaft 5 disc 6 second iron ring 7 steel ball 8 disc 9 disc 10 carrier 11 notch groove 12 notch groove 13 roller shaft 14 first planetary magnetic friction Roller 15 Second planetary magnetic friction roller 21 Disk 22 First iron ring 23 Output shaft 24 Input shaft 25 Bearing body 26 Second iron ring 27 Steel ball 28 Disk 29 Disk 30 Carrier 31 Notch groove 32 Notch groove 33 Roller shaft 34 First planetary magnetic friction roller 35 Second planetary magnetic friction roller

Claims (2)

[Claims] 1. A first iron ring having a large inner diameter is fixed to a bearing body fixed to a support body, an output shaft is rotatably supported, and the input shaft is aligned with the shaft center. A disk that is parallel to the bearing body is fixed to the input shaft, and a second iron ring having a small inner diameter is fixed to the disk, and the first and second iron rings that face each other are fixed. Relatively rotatable with a plurality of steel balls interposed therebetween, a carrier having a pair of discs facing each other in parallel to the axial direction is fixed to the output shaft, and the outer peripheral side of the pair of discs faces each other. A plurality of notched grooves extending radially is provided at a position, a roller shaft is supported in the notched grooves so as to be rotatable and movable in a radial direction, and one end side of the roller shaft is provided with an inner ring of the first iron ring. Secures a large diameter first planetary magnetic friction roller that rotates and revolves around the circumference At the same time, the second end of the small diameter is rotatably and rotatably in contact with the inner circumference of the second iron ring on the other end side.
The planetary magnetic friction roller is fixed to the first planetary magnetic friction roller, the first iron ring, the steel ball, the second iron ring, and the second planetary magnetic friction roller. 2 planetary magnetic friction roller and first,
When the mutual contact surface with the second iron ring wears, the roller shaft is relatively moved in the radial direction by the magnetic attraction force, and the first and second planetary magnetic frictions with respect to the first and second iron rings. A magnetic friction roller type speed reducer characterized in that an appropriate contact state of the rollers is maintained. 2. A disk is fixed to one end side of the output shaft, a first iron ring having a large inner diameter is fixed to this disk, and a bearing made fixed to a support is made of a second iron ring having a small inner diameter. The ring is fixed, and the input shaft is rotatably supported by aligning the output shaft and the shaft center, and a plurality of steel balls are interposed between the first and second iron rings facing each other to be relatively rotatable. The input shaft is fixed with a carrier having a pair of discs facing each other in parallel to the axial direction, and a plurality of notch grooves extending radially at opposing positions are provided on the outer peripheral side of the pair of discs. A large-diameter first roller supporting a roller shaft rotatably in the notch groove and movably in the radial direction, and having one end side of the roller shaft rotatably and revolvably contacting the inner circumference of the first iron ring. The planetary magnetic friction roller is fixed and the second iron ring is provided on the other end side. A second planetary magnetic friction roller having a small diameter which is rotatably and revolvably contacted with the inner periphery of the first planetary magnetic friction roller, and the first planetary magnetic friction roller-first iron ring-steel ball-
A second iron ring-forming a magnetic circuit connected to the second planetary magnetic friction roller, and when the mutual contact surfaces of the first and second planetary magnetic friction rollers and the first and second iron rings are worn, A magnetic attraction force is used to relatively move the roller shaft in the radial direction to maintain an appropriate contact state between the first and second planetary magnetic friction rollers with respect to the first and second iron rings. Magnetic friction roller type speed reducer.