JPH1182558A - One-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components and to facilitate labor-saving for assembling, by constituting positions and polarities of magnetic poles so as to generate rotating force in the direction that both cam surfaces of sprags are pressed on an inner ring and an outer ring by the action of magnetic poles formed on the rear side and the front side of the sprags. SOLUTION: Magnetic poles 3n being north poles are formed on the front sides 3f of sprags 3, and magnetic poles 3s being south poles are formed on the rear sides 3r. Also, magnetic poles 4s being south poles are formed on the front sides 4f of the sprags 4, and magnetic poles 4n being north poles are formed on the rear sides 4r. Counterclockwise rotating force is generated to respective sprags 3, 4 by mutual repulsion force of these magnetic poles, and the force is added so as to always contact outer cam surfaces 3a, 4a with an outer ring 1, and inner cam surfaces 3b, 4b with an inner ring 2. Further, the alternately arranged sprags 3, 4 are mutually repelled in the circumference direction of the inner and outer rings, therefore, they are retained at nearly equal intervals between the outer ring 1 and the inner ring 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way clutch constructed by mounting a plurality of sprags between an inner ring and an outer ring.

[0002]

A conventional one-way clutch having a plurality of sprags mounted between an inner ring and an outer ring requires a large number of parts such as a retainer and a spring in addition to the plurality of sprags. The management became cumbersome, and the assembly required many man-hours.

[0003]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a one-way clutch in which a plurality of sprags having cam surfaces formed at both ends are mounted between an inner ring and an outer ring. At least one position on the front side connecting the front ends of the outer ring side cam surface and the inner ring side cam surface respectively formed on the sprag, and on the rear side connecting the two rear ends of the outer ring side cam surface and the inner ring side cam surface. Magnetic poles are formed at one or more positions, respectively, and the positions and polarities of the magnetic poles are acted on magnetic poles formed on the rear and front side surfaces of the sprags arranged in front and rear, so that both cam surfaces of the sprags are formed inside and outside. It is characterized in that it is formed in a combination that generates a rotational force in the direction of pressing and biasing the outer ring.

[0004] A second aspect of the invention is a one-way clutch comprising a plurality of sprags having cam surfaces formed at both ends mounted between an inner ring and an outer ring. A magnetic pole is formed on the outer ring side cam surface and the inner ring side cam surface.

According to a third aspect of the present invention, there is provided a one-way clutch in which a plurality of sprags each having a cam surface formed at both ends are mounted between an inner ring and an outer ring, wherein the inner ring and / or the outer ring are formed of a magnetic material. A magnetic pole is formed on a cam surface of a sprag abutting on an outer ring made of a magnetic material or / and on a cam surface of a sprag abutting on an inner ring made of a magnetic material, at a position near a tip to be abutted at the time of locking. And

According to a fourth aspect of the present invention, in the second or third aspect, a magnetic pole is formed at a radially intermediate portion of the front side surface and the rear side surface of the sprag, and a relative position is formed between the sprags arranged before and after. Wherein the magnetic poles are formed in a combination having the same polarity.

According to a fifth aspect of the present invention, in the second, third or fourth aspect of the present invention, the sprags are arranged at the same intervals as the sprags on the outer ring or the inner ring with which the cam surface on which the magnetic poles are formed abuts. And a magnetic pole having a different polarity from the magnetic pole of the cam surface of the contacting sprag.

A sixth aspect of the present invention is characterized in that, in the fifth aspect of the present invention, a magnetic pole having a different polarity from the magnetic pole is formed on the inner ring or the outer ring between the magnetic poles formed on the inner ring or the outer ring.

[0009]

Next, an embodiment of a one-way clutch according to the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing a main part of the first embodiment, and FIGS. 2 and 3 are views showing a part of FIG. In the figure, 1 is an outer ring, 2 is an inner ring, and these outer ring 1 and inner ring 2
The sprags 3 and 4 are alternately arranged between them. Although not shown in FIG. 1, the outer ring 1 and the inner ring 2 are not shown.
The sprags 3, 4 are arranged at substantially equal intervals over the entire circumference. The sprags 3, 4 have cam surfaces 3a,
3b and cam surfaces 4a, 4b are formed, the cam surfaces 3a, 4a abut on the outer race 1, and the cam surfaces 3b, 4b abut on the inner race 2. These cam surfaces 3a, 4a and 3b,
4b is formed such that the length between the outer ring contact portion and the inner ring contact portion increases as the sprags 3, 4 rotate counterclockwise.

In FIG. 1, the outer race 1 is fixed with the inner race 2 fixed.
When the sprags 3 and 4 are held on the inner ring 2 side when is rotated clockwise, the outer ring 1
4 slides on the cam surfaces 3a and 4a and rotates freely as indicated by the arrow on the outer ring 1 side. Conversely, inner ring 2
When the outer ring 1 is rotated counterclockwise with the
The outer ring 1 presses the cam surfaces 3a and 4a by friction,
The sprags 3 and 4 are locked after slightly rolling in the counterclockwise direction, and the rotation of the outer ring 1 is
Conveyed to. These are the same as the operation of a one-way clutch using a conventional sprag.

In the embodiment of the present invention, when the sprags 3, 4 are locked, the outer ring 1 is rotated forward in the rotational direction, that is, leftward is defined as forward and rightward as backward.
4 and the front and rear ends of the cam surfaces 3a, 4a and the cam surfaces 3b, 4
The side surfaces formed between the front and rear ends of b are referred to as front side surfaces 3f, 4f and rear side surfaces 3r, 4r, respectively. Here, a slightly cam surface 3b of the front side surface 3f of the sprag 3
A magnetic pole 3n is located at a position closer to the rear surface 3r, and a slightly cam surface 3r.
A magnetic pole 3s is formed at a position near a. A magnetic pole 4s is formed at a position slightly closer to the cam surface 4b of the front side surface 4f of the sprag 4, and a magnetic pole 4n is formed at a position slightly closer to the cam surface 4a of the rear side surface 4r.

The polarities of these magnetic poles are such that when the sprags 3 and 4 are alternately mounted between the outer race 1 and the inner race 2, the sprags 3 and the sprags 4 located in front and rear repel each other. The magnetic poles at opposing positions have the same polarity. That is, in the figure, the magnetic pole 3n which is an N pole is provided on the front side surface 3f of the sprag 3, and the magnetic pole 3 which is an S pole is provided on the rear side surface 3r.
s is formed. A magnetic pole 4s, which is an S pole, is formed on the front side face 4f of the sprag 4, and a magnetic pole 4n, which is an N pole, is formed on the rear side face 4r. When these magnetic poles repel each other, a force is generated in each of the sprags 3 and 4 to rotate the sprags 3 in a counterclockwise direction, and the outer cam surfaces 3a and 4a are
Then, the inner cam surfaces 3b, 4b are urged to always contact the inner ring 2.

Moreover, the sprags 3, 4 alternately arranged
Are repelled from each other in the circumferential direction of the inner and outer rings, so that the sprags 3 and 4 are held at substantially equal intervals between the outer ring 1 and the inner ring 2. In this embodiment, the retainer and the spring, which were required in the conventional sprag type one-way clutch, are not required, and the number of parts and the number of assembling steps can be reduced.
The number of sprags can be increased, and miniaturization is possible.

FIG. 4 is a diagram showing another embodiment of the formation of the magnetic poles in the first embodiment. As shown in FIGS. 2 and 3, in the first embodiment, the shape of the sprags 3, 4 is sufficiently long in the axial direction of the one-way clutch. However, as shown in FIG. If the magnetic pole 3 is short in the axial direction and the magnetic pole is formed almost entirely in the axial direction, the sprags may protrude in the axial direction at the time of assembly or the like due to rebound between the front and rear of the sprags. Therefore, in order to improve the axial stability of the sprag, one of the opposed magnetic poles 3n is shortened in the axial direction and formed at the center, and the other magnetic pole 3s is bisected in the axial direction and arranged on both sides. It is. Although not shown, the sprags 4 have the same arrangement of magnetic poles.
By arranging the magnetic poles in this way, the sprags 3, 4 arranged one after the other are stabilized at the same position in the axial direction, so that the sprags are prevented from popping out.

FIG. 5 is an explanatory view showing the structure of a sprag used in the second embodiment. In the first embodiment shown in FIG. 1, different magnetic poles are formed on the front side surface and the rear side surface of the sprag. Therefore, in the case of mounting, two types of sprags 3 and 4 having mutually different magnetic pole polarities are alternately mounted. And the number of attachments is limited to an even number. Therefore, in this embodiment, the magnetic poles 5n having the same polarity are formed on both the front side surface 5f and the rear side surface 5r of the sprag 5, as shown in FIG. It was done. When the sprags 5 are mounted between the inner and outer wheels to form a one-way clutch, only one type of sprag is used, and the sprags can be mounted in an odd number. Since the sprags 5 can be incorporated between the sprags 3 and 4 in the first embodiment, the sprags 5 are used for offsetting the sprags 3 and 4 in the first embodiment. However, an odd number of sprags can be assembled.

FIG. 6 is an explanatory diagram showing a main part of the third embodiment, and FIG. 7 is a diagram showing a part of FIG. In this embodiment, the first embodiment utilizes the repulsive force of the magnetic pole between the front and rear sprags to generate a rotational force in the sprag, whereas the first embodiment utilizes the attractive force of the magnetic pole.
That is, the sprag 6 used in this embodiment has the magnetic pole 6n at a position slightly closer to the cam surface 6a side than the center portion of the front side surface 6f and the cam surface 6b slightly above the center portion of the rear side surface 6r.
A magnetic pole 6s is formed at a side position. By arranging the sprags 6 between the outer ring 1 and the inner ring 2, the magnetic poles 6n and the magnetic poles 6s attract each other between the sprags 6 located before and after each other. , A counterclockwise rotational force is generated, and the outer cam surface 6a is urged to always contact the outer ring 1 and the inner cam surface 6b to the inner ring 2.

On the front side surface 6f and the rear side surface 6r of the sprag 6, a curved surface formed of a concentric circle centered on the rotation axis O when the sprag 6 rolls is formed, and the curved surface portion has a magnetic pole 6n and a magnetic pole 6n. 6s are formed. Further, since the sprags 6 that come before and after are in contact with each other due to this curved surface, even when each sprag 6 rolls, the sprags 6 are kept at the same interval. Further, in this embodiment, since only one type of sprag 6 is used, the number of sprags to be mounted is not limited to an even number as in the first embodiment. In addition, since the sprags 6 that are adjacent to each other have a configuration of magnetic poles that are attracted to each other, the sprags 6 are connected to the outer race 1 in the assembly process.
The work of assembling between the inner ring 2 and the inner ring 2 becomes easy.

FIG. 8 is an explanatory diagram showing a main part of the fourth embodiment, and FIG. 9 is a diagram showing a part of FIG. This embodiment utilizes the repulsive force of the magnetic pole between the front and rear sprags, as in the first embodiment. That is, a sprag 7 having a flatter cross-sectional shape than the sprags 3 and 4 of the first embodiment is disposed between the outer ring 1 and the inner ring 2, and magnetic poles are provided on the front side surface 7 f and the rear side surface 7 r of the sprag 7. By alternately forming 7n and 7s,
At the time of mounting, the front and rear sprags 7 repel each other to generate a counterclockwise rotational force on the sprags 7.

In this embodiment, the shape of the sprag 7 is
The outer ring 1 and the inner ring 2 are flatter than the first embodiment.
Have the same dimensions, the number of sprags mounted can be increased as compared with the case of the first embodiment. Further, by adopting a configuration in which the magnetic poles 7n and 7s are alternately arranged, the front and rear sprags 7 are of the same type, and the number of attachments is not limited to an even number. In the figure, the adjacent magnetic poles 7n and 7s are formed continuously without an interval, but it is also possible to form a non-magnetized portion between the magnetic poles 7n and 7s. Further, in this embodiment, four magnetic poles are formed on the front side surface 7f and the rear side surface 7r, respectively. However, the number of magnetic poles is not limited to four. It is also possible to form more than two magnetic poles.

FIG. 10 is an explanatory view showing a main part of the fifth embodiment, and FIGS. 11 and 12 are views showing a part of FIG. In this embodiment, sprags 8 and sprags 9 having a flat cross section are alternately arranged. The sprag 8 has magnetic poles 8n formed at both ends of a front side surface 8f, and magnetic poles 8s formed at both ends of a rear side surface 8r. The sprag 9 has a magnetic pole 9n at the inner end of the front side surface 9f and a magnetic pole 9s at the outer end.
And a magnetic pole 9s is formed at the inner end of the rear side surface 9r, and a magnetic pole 9n is formed at the outer end.

From the combination of these magnetic poles, if the sprags 8, 9 are alternately arranged between the outer ring 1 and the inner ring 2,
The inner portions of the sprags 8 and 9 attract each other to generate centripetal force, and the outer portions repel each other to generate centrifugal force. As a result, the cam surfaces 8 of the sprags 8 and 9 are generated.
a, 9a contact the outer ring 1 and the cam surfaces 8b, 9b
To maintain the contact state. Also, the magnetic poles 8n, 9s and the magnetic poles 8 inside the sprags 8, 9 are provided.
The repulsive force between the outer magnetic poles 8n, 9n and the magnetic poles 8s, 9s is relatively larger than the attraction force between the outer magnetic poles 8n, 9s and the inner magnetic poles 8n, 9s, and 8s.
By adjusting the magnetic force of each magnetic pole so that s and 9n are not completely attracted, the distance between the sprags 8 and 9 that are adjacent to each other is kept constant.

As a modification of this embodiment, two magnetic poles formed at the ends of the front side surfaces 8f, 9f and the rear side surfaces 8r, 9r of the sprags 8, 9 near the cam surfaces 8a, 9a,
When both have the same polarity, the magnetized form of both sprags becomes the same, and only one type of sprag can be arranged between the outer ring 1 and the inner ring 2 to form a one-way clutch.

FIG. 13 is an explanatory diagram showing a main part of the sixth embodiment. In this embodiment, the outer ring 1 and the inner ring 2 are formed of a magnetic material such as steel,
The magnetic poles 10n and 10s are formed on the cam surfaces 10a and 10b, so that the magnetic pole 10n attracts the outer ring 1 and the magnetic pole 10s attracts the inner ring 2. Thereby,
Even in a state where the outer ring 1 is stopped with respect to the inner ring 2 and in a free state where the outer ring 1 rotates clockwise, the cam surfaces 10a and 10
b contacts the outer ring 1 and the inner ring 2.

On the front side face 10f and the rear side face 10r of the sprag 10, a concentric curved surface is formed around the rotation axis when the sprag 10 rolls. By being abutted, even when each sprag 10 rolls, the sprags are kept at the same interval. If the magnetic force of the magnetic pole 10n on the outer ring 1 side is larger than the magnetic pole 10s, the sprag 10 rotates together with the outer ring 1 during free rotation, and if the magnetic force of the magnetic pole 10s on the inner ring 2 side is larger than the magnetic pole 10n, the sprag 10 remains stationary with the inner ring 2 during free rotation.

In this embodiment, the outer ring 1 and the inner ring 2 are made of a magnetic material. However, in order to further increase the attraction force between the sprag 10 and the outer ring 1 and the inner ring 2, the magnetic poles of the sprag 10 are formed on the entire inner surface of the outer ring 1. It is possible to form a magnetic pole having a polarity different from 10n, or to form a magnetic pole having a polarity different from the magnetic pole 10s of the sprag 10 on the entire outer surface of the inner ring 2. The configuration in which both or one of the outer ring 1 and the inner ring 2 is magnetized can be applied to other embodiments.

FIG. 14 is an explanatory diagram showing a main part of the seventh embodiment. In this embodiment, the outer ring 1 and the inner ring 2 are formed of a magnetic material such as steel,
The magnetic poles 11n are formed on the cam surfaces 11a and 11b, respectively, such that the magnetic poles 11n of the cam surface 11a attract the outer ring 1 and the magnetic poles 11n of the cam surface 11b attract the inner ring 2. As a result, the cam surfaces 11a and 11b are in contact with the outer ring 1 and the inner ring 2 even in a state where the outer ring 1 is stopped with respect to the inner ring 2 and a free state where the outer ring 1 rotates clockwise. Further, a magnetic pole 11s is formed on each of the front side surface 11f and the rear side surface 11r of the sprag 11,
The magnetic poles 11 s between the sprags 11 arranged before and after
Are repelled, so that the interval between the sprags 11 is kept constant.

FIG. 15 is an explanatory diagram showing a main part of the eighth embodiment. In this embodiment, the inner ring 2 is formed of a magnetic material such as steel, and the cam surface 12 of the sprag 12 is formed.
A magnetic pole 12n is formed in a portion b, which is a side (a position on the left side in the figure) to be brought into contact at the time of locking, and this magnetic pole 12n attracts the inner ring 2. In particular, the cam surface 12b where the sprag 12 is in contact with the inner ring 2
Since the magnetic pole 12n is formed on the left side of the point P, when the magnetic pole 12n tries to attract the inner ring 2, the sprag 12 has a force for rotating the sprag 12 counterclockwise around the point P. Occur.

As a result, the cam surface 12a on the outer ring 1 side moves toward the upper left outer ring 1 side, and the cam surface 12a is kept in contact with the outer ring 1. As a result, the cam surfaces 12a and 12b are in contact with the outer ring 1 and the inner ring 2 even in a state where the outer ring 1 is stopped with respect to the inner ring 2 and in a free state where the outer ring 1 rotates clockwise. Front side 1 of this sprag 12
2f and the rear side surface 12r are formed with concentric curved surfaces centered on the rotation axis when the sprags 12 roll, and the sprags 12 before and after this curved surface are brought into contact with each other, so that each sprag 12 Also when the treads 12 roll, the sprags are kept at the same interval.

FIG. 16 is an explanatory diagram showing a main part of the ninth embodiment. In this embodiment, similarly to the eighth embodiment, the inner ring 2 is formed of a magnetic material such as steel, and the magnetic pole 13n is formed on a portion of the cam surface 13b of the sprag 13 which is abutted upon locking. Is formed so that the magnetic pole 13n attracts the inner ring 2.
This embodiment is different from the eighth embodiment in that magnetic poles 13s are formed on the front side surface 13f and the rear side surface 13r of the sprags 13, respectively. By repelling,
The distance between the sprags 13 is kept constant.

FIG. 17 is an explanatory diagram showing a main part of the tenth embodiment. In this embodiment, an outer ring 1 and an inner ring 2 are formed of a magnetic material such as steel, and a sprag 1
The magnetic poles 14n are formed on the cam surfaces 14a and 14b of the No. 4 on the side to be brought into contact at the time of locking.
The magnetic pole 14n of the cam surface 14a attracts the outer ring 1 and the cam surface 1a.
The magnetic poles 14n of 4b attract the inner ring 2. As a result, the cam surfaces 14a and 14b come into contact with the outer ring 1 and the inner ring 2, respectively, in a state where the outer ring 1 is stopped with respect to the inner ring 2 and in a free state where the outer ring 1 rotates clockwise. Also, the front side surface 14f and the rear side surface 1 of the sprag 14
A magnetic pole 14s is formed on each of the sprags 4r, and the gaps between the sprags 14 are kept constant by repulsion of the magnetic poles 14s between the sprags 14 arranged before and after.

FIG. 18 is an explanatory diagram showing a main part of the eleventh embodiment. This embodiment is a modification of the tenth embodiment. The outer ring 1 and the sprags 14 have the same configuration as the tenth embodiment, and only the inner ring 2 is different. That is,
The magnetic poles 2s are formed on the surface of the inner ring 2 at the same interval as the arrangement intervals of the sprags 14, and the magnetic poles 14n formed on the cam surface 14b of the sprag 14 are attracted to the magnetic poles 2s. The position of the sprag 14 in the rotation direction with respect to the inner ring 2 is regulated, and the sprag 14 is more reliably held on the inner ring 2 in a free state. The configuration in which the magnetic poles are formed on the inner race 2 at the intervals of the arrangement of the sprags is also applicable to the sixth and seventh embodiments.

FIG. 19 is an explanatory diagram showing a main part of the twelfth embodiment. This embodiment is a modification of the ninth embodiment shown in FIG.
This embodiment has the same configuration as that of the first embodiment, and only the inner ring 2 is different.
That is, the magnetic poles 2s are formed on the surface of the inner ring 2 at the same intervals as the arrangement intervals of the sprags 13, and the magnetic poles 13n formed on the cam surface 13b of the sprags 13 are attracted to the magnetic poles 2s. In addition, the position of the sprag 13 in the rotation direction on the inner ring 2 is regulated, and the sprag 13 is more securely held on the inner ring 2 in a free state. In this embodiment, the inner ring 2 has a magnetic pole 2 having a different polarity from the magnetic pole 13n formed on the cam surface 13b of the sprag 13.
Although s is formed, it is also possible to use magnetic poles 2n of the same polarity. In this case, the sprag 13 is held at a position between the adjacent magnetic poles 2n.

FIG. 20 is an explanatory diagram showing a main part of the thirteenth embodiment. In this embodiment, a part of the sprag 13 of the twelfth embodiment is modified. That is, the outer ring 1 and the inner ring 2 are the same as those in the twelfth embodiment, and the sprags 15
The magnetic pole 13s formed in r is deleted.
The sprags 15 are formed with magnetic poles 15n only on the cam surface 15b, and are maintained at a fixed interval between the adjacent sprags 15 only by the attraction between the magnetic poles 2s of the inner ring 2 and the magnetic poles 15n of the sprags 15.

FIG. 21 is an explanatory diagram showing a main part of the fourteenth embodiment. In this embodiment, a part of the inner race 2 of the thirteenth embodiment is modified. That is, the outer ring 1,
The sprag 15 is the same as that of the thirteenth embodiment, in which the magnetic poles 2n are alternately formed between the magnetic poles 2s of the inner ring 2. In this embodiment, when the sprags 15 try to deviate from the normal position with respect to the inner ring 2, the magnetic poles 2n repel the magnetic poles 15n of the sprags 15, so that it is difficult for the sprags 15 to deviate from the normal position. The inner ring 2 has magnetic poles 2s, 2s.
The configuration in which n are alternately formed is also applicable to the eleventh and twelfth embodiments.

In the drawings of the above-described embodiments, the magnetic poles 3n to 3n formed on the sprags 3 to 15 in FIG.
15n, 3s to 14s are indicated on the surface of the sprags 3 to 15 as if they were formed independently, but are indicated as polarities appearing on the surfaces of the sprags 3 to 15. , Actually, the magnetic poles 3n to 15n
And the inner portions of the magnetic poles 3 s to 14 s serve as entrances or exits of magnetic force lines, respectively, and magnetic poles are formed so as to be connected to each other by magnetic force lines (not shown).

Next, a method of manufacturing the sprags 3 to 15 will be described. As one of the methods, a magnetic material having mechanical strength is formed into a predetermined sprag shape, and the above-described arrangement of the polarities is performed by a magnetizing device. Magnetize so that Specific examples include molding by magnet processing of a magnet material, molding by a plastic magnet, and sintering by metal powder. As another method, it is also possible to embed a separately prepared magnetic pole at a predetermined position of the sprag, or to fix the magnetic pole with an adhesive, caulking, screw, or the like.

When the sprags 3 to 15 are made of a magnetizable magnet material, the strength and wear resistance of the portions contacting the outer ring 1 and the inner ring 2 may be insufficient. In that case, it is also possible to form a composite structure using a steel material or the like having excellent mechanical strength and abrasion resistance only for the portion that comes into contact with the outer ring 1 and the inner ring 2 and using the other portions as a magnet material.

In each of the above embodiments, each sprag is described as being held on the inner ring 2 side. However, the opposite case, that is, each sprag can be held on the outer ring 1 side can also be adopted. It is. In that case, outer ring 1
The configuration of the magnetic poles of the inner ring 2 may be exchanged, and the configuration of the magnetic poles of each sprag may be exchanged between the outside and the inside.

In each of the above embodiments, the one-way clutch is constituted by the outer ring, the inner ring and the sprags. As is well known, the one-way clutch is constituted only by the outer ring and the sprags excluding the inner ring. There is also a configuration in which a shaft is inserted through an inner ring portion, and the present invention can be similarly applied to those one-way clutches.

[0040]

As described above, according to the present invention, since the magnetic poles are formed on the sprags themselves, the interaction between the magnetic poles between the sprags before and after each other or the attraction / repulsion between the sprags and the inner / outer rings causes the sprags themselves. Is pressed and urged to the inner and outer rings, and the sprags are evenly held, so that the retainer and the spring are unnecessary. Thereby, the number of parts of the one-way clutch is reduced, and labor and cost of assembly can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a main part of a first embodiment of the present invention.

FIG. 2 is a view showing a part of FIG. 1 taken out, in which FIG. 2 (a) is an end view, and FIG. 2 (b) is a sectional view taken along line AA in FIG. 2 (a).

3 is a view showing a part of FIG. 1 taken out, in which FIG. 3 (a) is an end view, and FIG. 3 (b) is a sectional view taken along line BB of FIG. 3 (a).

4A and 4B are diagrams showing another form of the formation of the magnetic pole in the first embodiment, wherein FIG. 4A is an end view, and FIG. 4B is a cross-sectional view taken along line CC of FIG.

FIG. 5 is an explanatory diagram showing a configuration of a sprag used in a second embodiment.

FIG. 6 is an explanatory diagram showing a main part of a third embodiment.

FIG. 7 is a diagram showing a part of FIG.

FIG. 8 is an explanatory diagram showing a main part of a fourth embodiment.

FIG. 9 is a diagram showing a part of FIG.

FIG. 10 is an explanatory diagram showing a main part of a fifth embodiment.

11 is a diagram showing a part of FIG. 10 taken out.

FIG. 12 is a diagram showing a part of FIG.

FIG. 13 is an explanatory diagram showing a main part of a sixth embodiment.

FIG. 14 is an explanatory diagram showing a main part of a seventh embodiment.

FIG. 15 is an explanatory diagram showing a main part of an eighth embodiment.

FIG. 16 is an explanatory diagram showing a main part of a ninth embodiment.

FIG. 17 is an explanatory diagram showing a main part of a tenth embodiment.

FIG. 18 is an explanatory diagram showing a main part of the eleventh embodiment.

FIG. 19 is an explanatory diagram showing a main part of a twelfth embodiment.

FIG. 20 is an explanatory diagram showing a main part of a thirteenth embodiment.

FIG. 21 is an explanatory diagram showing a main part of a fourteenth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 2n Magnetic pole (N pole) 2s Magnetic pole (S pole) 3-15 Sprag 3a-15a Cam surface 3b-15b Cam surface 3f-15f Front side 3r-15r Rear side 3n-15n Magnetic pole (N pole) 3s- 14s magnetic pole (S pole)

Claims (6)

[Claims] 1. A one-way clutch comprising a plurality of sprags having cam surfaces formed at both ends thereof mounted between an inner ring and an outer ring, wherein both front ends of an outer ring side cam surface and an inner ring side cam surface respectively formed on the sprags are provided. The magnetic poles are formed at one or more positions on the front side connecting the front side and one or more positions on the rear side connecting the rear ends of the outer ring side cam surface and the inner ring side cam surface, respectively. Interacts with the magnetic poles formed on the rear and front sides of the sprags that are placed in
A one-way clutch formed in a combination that generates a rotational force in a direction of urging the outer ring. 2. A one-way clutch comprising a plurality of sprags having cam surfaces formed on both ends thereof mounted between an inner ring and an outer ring, wherein the inner ring and the outer ring are formed of a magnetic material, and the outer ring-side cam surface of the sprags and A one-way clutch in which magnetic poles are formed on the inner ring side cam surface. 3. A one-way clutch in which a plurality of sprags having cam surfaces formed at both ends are mounted between an inner ring and an outer ring, wherein the inner ring and / or the outer ring are formed of a magnetic material, and the outer ring is formed of a magnetic material. A one-way clutch, wherein a magnetic pole is formed on a cam surface of a sprag that abuts on an inner ring made of a magnetic material and / or on a cam surface of a sprag that abuts on an inner ring made of a magnetic material at a position close to a tip to be abutted upon locking. 4. The one-way clutch according to claim 2, wherein a magnetic pole is formed at each of radially intermediate portions of a front side surface and a rear side surface of the sprag, and the magnetic poles facing each other between the front and rear sprags are arranged. The one-way clutch is characterized by being formed in a combination having the same polarity. 5. The method of claim 2 or claim 3 or claim 4.
In the one-way clutch according to the present invention, it is preferable that a magnetic pole having a polarity different from the magnetic pole of the cam surface of the contacting sprag is formed on the outer ring or the inner ring on which the cam surface on which the magnetic pole is formed abuts at the same interval as the sprag arrangement interval. Features a one-way clutch. 6. The one-way clutch according to claim 5, wherein a magnetic pole having a different polarity from the magnetic pole is formed on the inner ring or the outer ring between the magnetic poles formed on the inner ring or the outer ring.