JP2002174310A - Rotary friction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary friction device capable of maintaining its functions by itself without relying on the accuracy of a peripheral structure. SOLUTION: Since a rotor 1 and a passive element 3 are mutually engaged so as to relatively rotate via each ball 5, the rotor 1 and the passive element 3 can be accurately held in predetermined relative positions in the axial direction. Since a groove 1b of the rotor 1 is formed slightly larger in the axial direction than the balls 5, the rotor 1 can be minutely moved in the axial direction with respect to the passive element 3 in accordance with a load F.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary friction device used as a mechanism for imparting an arbitrary resistance by a frictional force to the rotation of various machines.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. 2000-18675
As described in Japanese Unexamined Patent Publication (Kokai) No. 2 (1995) -195, a rotating body that rotates about an axis, a number of rollers arranged along the rotating orbit of the rotating body, and radially opposed to the rotating body with each roller interposed therebetween. And a holding body that holds the rollers rotatably at intervals from each other, and inclines the rolling axis of each roller so as to form a predetermined angle with respect to the rotation axis of the rotating body. There is known a rotary friction device in which a rolling axis of each roller is inclined in a predetermined direction so as to form a predetermined angle with respect to a plane including a rotation axis of a rotating body.

In this rotary friction device, while rotating the rotating body with respect to the passive body, an axial load is applied in a direction in which the opposing surfaces of the rotating body and the passive body approach each other, so that each roller is rotated by the rotating body and the passive body. It rolls while generating sliding friction with the opposing surface of the body, so that a rotating resistance according to the load is applied to the rotating body.

[0004]

Since the rotary friction device does not function alone, for example, when it is used in a power transmission device, the rotating body and the passive body are respectively mounted on a drive shaft and a driven shaft. In addition to the connection, it is necessary to support the rotating body and the passive body so as to be relatively movable in the axial direction.

However, since the amount of movement of the rotating body or the passive body in accordance with the axial load is extremely small, a desired frictional force is effectively generated unless the relative position in the axial direction is accurately maintained. Can not do.

Accordingly, strict precision is required for the peripheral structure for supporting the rotating body and the passive body. However, if the rotary friction device can maintain its function alone, it is convenient for designing and manufacturing the peripheral structure. It is.

In view of the above circumstances, it is an object of the present invention to provide a rotary friction device capable of maintaining its function alone without depending on the accuracy of the peripheral structure.

[0008]

In order to achieve the above object, according to the present invention, there is provided a rotating body which rotates around an axis, and a plurality of rollers arranged along a rotating orbit of the rotating body. And a passive body that radially opposes the rotating body with each roller interposed therebetween, and a holding body that rotatably holds each roller at an interval from each other, and that the rolling shaft of each roller is A rotary friction device in which the roller is inclined so as to form a predetermined angle with respect to the rotation axis, and the rolling axis of each roller is tilted in a predetermined direction so as to form a predetermined angle with respect to a plane including the rotation axis of the rotating body. In the above, the rotating body and the passive body are relatively rotatably engaged via a plurality of balls which are rotatably engaged with circumferentially extending grooves provided on respective opposing surfaces, and at least one of the grooves is The ball is formed so that it can move a predetermined distance in the axial direction of the rotating body. There.

Thus, while the rotating body is rotated with respect to the passive body, an axial load is applied in a direction in which the opposing surfaces of the rotating body and the passive body approach each other, whereby each roller is opposed to the rotating body and the passive body. It rolls while generating sliding friction with the surface, and a rotation resistance according to the load is applied to the rotating body. At this time, the rotating body and the passive body are relatively rotatably engaged with each other via the respective balls that engage with the respective grooves, so that the rotating body and the passive body are held at predetermined relative positions in the axial direction. In this case, since at least one of the grooves is formed so that each ball can be moved by a predetermined distance in the axial direction of the rotating body, the axial minute movement of the rotating body with respect to the passive body in response to the axial load. It becomes possible.

According to a second aspect of the present invention, in the rotary friction device according to the first aspect, the angle of inclination of the rolling axis of each roller with respect to the rotating axis of the rotating body is greater than 5 ° and less than 20 °. The rolling axis of each roller is inclined in the same direction with respect to a plane including the rotation axis of the rotating body, and the inclination angle is greater than 25 ° and smaller than 90 °.

According to this, in addition to the operation of the first aspect, since the rolling axes of the rollers are inclined in the same direction with respect to a plane including the rotating axis of the rotating body, each of the rollers depends on the rotating direction of the rotating body. Different friction forces occur. In this case, the inclination angle of the rolling axis of each roller with respect to the rotating axis of the rotating body is set to be larger than 5 ° and smaller than 20 °, and the rolling axis of each roller is set on a plane including the rotating axis of the rotating body. By setting the inclination angle to be larger than 25 ° and smaller than 90 °, an effective and stable friction force is always generated.

According to a third aspect of the present invention, in the rotary friction device according to the first aspect, the angle of inclination of the rolling shaft of each roller with respect to the rotating shaft of the rotating body is larger than 3 ° and smaller than 20 °. The rolling axis of each roller is inclined in the opposite direction by a predetermined number with respect to the plane including the rotation axis of the rotating body, and the inclination angle is set to be larger than 25 ° and smaller than 90 °.

According to this, in addition to the function of the first aspect, since the rolling shaft of each roller is inclined in the opposite direction by a predetermined number with respect to the plane including the rotation axis of the rotating body, it is possible to move in the opposite directions. The magnitude of the frictional force in each rotation direction of the rotating body can be arbitrarily set by the number of the inclined rollers. In this case, the inclination angle of the rolling axis of each roller with respect to the rotating axis of the rotating body is set to be larger than 3 ° and smaller than 20 °, and the rolling axis of each roller is set on a plane including the rotating axis of the rotating body. By setting the inclination angle to be larger than 25 ° and smaller than 90 °, an effective and stable friction force is always generated.

According to a fourth aspect of the present invention, in the rotary friction device according to the third aspect, rollers that are inclined in directions opposite to each other with respect to a plane including a rotation axis of the rotating body are alternately provided by the same number in the circumferential direction of the rotating body. Have been placed.

Accordingly, in addition to the operation of the third aspect, the same frictional force is generated when the rotating body is rotated in any direction.

According to a fifth aspect of the present invention, in the rotary friction device according to the first, second, third or fourth aspect, the contact surfaces of the rotating body and the passive body with the roller are each defined in a cross section including the rolling axis of the roller. It is formed so as to be convex with respect to the outer peripheral surface of the roller.

Thus, in addition to the effects of the first, second, third, or fourth aspect, it is possible to reduce the contact pressure at both axial ends of the roller.

According to a sixth aspect of the present invention, in the rotary friction device according to the first, second, third or fourth aspect, the outer peripheral surface of the roller contacting the rotating body and the passive body is formed in a cross section including the rolling axis of the roller. Each is formed so as to be convex with respect to the contact surfaces of the rotating body and the passive body.

Thus, in addition to the function of the first, second, third or fourth aspect, it is possible to reduce the contact pressure at both ends in the axial direction of the roller as in the fifth aspect.

[0020]

1 to 7 show a first embodiment of the present invention. FIG. 1 is a front sectional view of a rotary friction device, FIG. 2 is a side sectional view of a main part thereof, and FIG. FIG. 4 is a schematic diagram showing the inclination angle of the roller, FIG. 5 is an explanatory diagram of the operation of the rotary friction device, and FIGS. 6 and 7 are graphs showing the relationship between the inclination angle of the roller and the friction torque. It is a figure showing a relation.

This rotary friction device includes a rotating body 1 that rotates around an axis, a number of rollers 2 arranged along the rotation orbit of the rotating body 1, and a rotating body 1 with each roller 2 interposed therebetween. It is composed of a radially opposed passive body 3, a cage 4 for rotatably holding each roller 2 at an interval from each other, and a number of balls 5 arranged between the rotating body 1 and the passive body 3. I have. Note that these are the minimum components constituting the rotary friction device, and in practice, the rotating body 1 and the passive body 3 are respectively connected to other transmission members and the like.

The rotating body 1 is formed in an annular shape around its rotation axis, and a track surface 1a facing the passive body 3 is formed on the outer peripheral surface thereof. The raceway surface 1a is formed to have a tapered shape around the rotation axis of the rotating body 1, and to have a concave curve in a cross section parallel to the rotation axis of the rotating body 1 as shown in FIG. Further, a groove 1b extending annularly in the circumferential direction is provided on the raceway surface 1a of the rotating body 1, and each ball 5 is engaged with the groove 1b. In this case, the cross section of the groove 1 b is formed slightly larger in the axial direction of the rotating body 1 than the cross section of the ball 5.

Each roller 2 has a cylindrical shape whose outer peripheral surface extends uniformly in the axial direction, and is arranged at equal intervals in the circumferential direction of the rotating body 1.

The passive body 3 is formed in an annular shape around the rotation axis of the rotating body 1, and a track surface 3 a facing the rotating body 1 is formed on the inner peripheral surface thereof. The raceway surface 3a has a tapered shape around the rotation axis of the rotating body 1, and is formed to have a convex curve in a cross section parallel to the rotation axis of the rotating body 1 as shown in FIG. A groove 3b extending annularly in the circumferential direction is provided on the raceway surface 3a of the passive body 3, and each ball 5 is engaged with the groove 3b. In this case, the cross section of the groove 3 b is formed so as to substantially coincide with the cross section of the ball 5.

The cage 4 is formed in an annular shape around the rotation axis of the rotating body 1, has a tapered shape curved along each of the raceway surfaces 1 a, 3 a, and has a thickness smaller than the outer diameter of each roller 2. Is formed. The cage 4 has a large number of holes 4 for rotatably holding the rollers 2 and the balls 5 respectively.
a, 4b are provided, and the holes 4a, 4b are arranged every other in the circumferential direction of the cage 4. The holes 4a for the rollers 2 are formed such that the rolling axes of the rollers 2 are inclined in the same direction as shown in FIG.

Each ball 5 is accommodated in each hole 4b of the cage 4, and is engaged with the grooves 1b, 3b of the rotating body 1 and the passive body 3 so as to freely roll, respectively. Thereby, the rotating body 1
The relative movement of the passive body 3 in the axial direction is restricted by the engagement of each ball 5 with the grooves 1b, 3b, but the groove 1b of the rotating body 1 is formed slightly larger in the axial direction than the ball 5. Therefore, the relative movement of the rotating body 1 and the passive body 3 is allowed only to that extent.

As shown in FIG. 4 (a), the rolling shaft 2a of each roller 2 forms a predetermined inclination angle α1 with respect to the rotating shaft 1b of the rotating body 1, and as shown in FIG. A predetermined inclination angle β1 is formed with respect to a plane including the rotation axis 1b of the rotating body 1. In this case, the inclination angle α1 of each roller 2 is 5
Is set to be larger than 20 ° and smaller than 20 °, and the inclination angle β
1 is set to be larger than 25 ° and smaller than 90 °. The inclination angle β1 is an angle as viewed from a direction perpendicular to the rolling shaft 2a of the roller 2.

Further, in the above configuration, when the rotating body 1 is inserted into the passive body 3, the rotating body 1 is divided into a plurality of pieces in the circumferential direction in advance, and each ball 5 is engaged with each of the grooves 1b, 3b. While rotating, the divided portions of the rotating body 1 are sequentially accommodated in the passive body 3. In this case, in order to integrate the divided portions of the rotating body 1, a cylindrical holding member 6 is inserted inside the rotating body 1, and one end 6a of the holding member 6 as shown in FIG.
Is bent so that the rotating body 1 is annularly held by the holding member 6. At this time, a packing 7 is interposed between one end 6 a of the holding member 6 and one end in the axial direction between the rotating body 1 and the passive body 3. Passive 3
An annular member 8 having a substantially L-shaped cross section is attached to the other end in the axial direction, and packing 9 is interposed between the annular member 8 and the other axial end between the rotating body 1 and the passive body 3. You. That is, the packings 7 and 8 seal the space between the rotating body 1 and the passive body 3 so that the lubricant filled between the rotating body 1 and the passive body 3 does not leak to the outside.

In the rotary friction device constructed as described above, when the rotating body 1 is rotated with an axial load F applied thereto as shown in FIG. 5, each roller 2 is rotated by the rotating body 1 and the passive body. Rolls while touching 3 and follows cage 4
Also rotate. At this time, when the rotating body 1 is rotated in one direction as shown in FIG. 5 (a) (hereinafter, referred to as forward rotation), each roller 2 is positioned in one of the axial directions of the rotating body 1, that is, as indicated by a broken arrow in the figure. The rotation of the rotating body 1 as indicated by the solid line arrow in the figure is restricted by the cage 4 while trying to roll in the direction inclined by the angle β1 with respect to the rotation orbit (the direction in which the diameter of the rotating body 1 becomes smaller). Since the rollers roll along the track, a frictional force proportional to the axial load F is generated between each roller 2 and the rotating body 1 and the passive body 3.

As shown in FIG. 5B, when the rotating body 1 is rotated in the other direction (hereinafter referred to as reverse rotation), each roller 2 is rotated in the other axial direction of the rotating body 1, that is, as indicated by a broken line arrow in the figure. As shown in the figure, the rotation of the rotating body 1 is restricted by the cage 4 while trying to roll in the direction inclined by the angle β1 with respect to the rotation orbit (the direction in which the diameter of the rotating body 1 increases). , The frictional force proportional to the axial load F is generated between each roller 2 and the rotating body 1 and the passive body 3.

At this time, since each roller 2 generates sliding friction while rolling, a stable resistance force is always obtained due to dynamic friction without generating static friction. By the rolling of No. 2, it instantaneously shifts to kinetic friction. When the rotating body 1 is rotated forward, each roller 2
Rolls in the direction in which the diameter of the rotating body 1 decreases, and in the reverse rotation, the rollers 2 roll in the direction in which the diameter of the rotating body 1 increases. The magnitude of the frictional force generated by each varies. In this case, the friction force in the forward rotation becomes larger than the friction force in the reverse rotation. When the load F in the axial direction of the rotating body 1 is released, it is possible to arbitrarily obtain a state in which no frictional force is generated.

In the rotary friction device, the rotating body 1 and the passive body 3 are relatively rotatably engaged with each other via the balls 5 engaged with the grooves 1b, 3b.
And the passive body 3 is held at a predetermined relative position in the axial direction.
In this case, since the groove 1 b of the rotating body 1 is formed slightly larger in the axial direction than the ball 5, the axial movement of the rotating body 1 relative to the passive body 3 according to the load F becomes possible.

As described above, according to the rotary friction device of the present embodiment, the rotating body 1 and the passive body 3 are relatively rotatably engaged with each other via the respective balls 5, so that the rotating body 1 and the passive body 3 are connected to each other. It can be accurately held at a predetermined relative position in the axial direction. Therefore, for example, even when used in a power transmission device or the like, the function can be maintained independently without depending on the precision of the peripheral structure, which is extremely convenient for designing and manufacturing the peripheral structure.

In the above embodiment, the groove 1 on the rotating body 1 side is used.
Although the groove b is slightly larger than the ball 5, the groove 3b on the side of the passive body 3 may be formed slightly larger. Further, both grooves 1b and 3b may be formed large.

By the way, the applicant has determined that the inclination angle α1,
The relationship between β1 and the friction torque P was confirmed by experiments and theoretical analysis for an inclination angle α1 of 3 ° to 40 ° and an inclination angle β1 of 5 ° to 85 °.

That is, as shown in FIG. 6, when the inclination angle α1 of each roller in the normal rotation of the rotating body 1 is 5 ° or less, the friction torque P sharply increases as the inclination angle β1 decreases. Thus, the rotating body 1 and the passive body 3 are easily locked to each other. Further, when the inclination angle α1 is larger than 5 °, no rapid change of the friction torque P is exhibited. However, when the inclination angle α1 becomes 20 ° or more, practically effective regardless of the magnitude of the inclination angle β1. The friction torque P exceeding the value cannot be obtained. On the other hand, the inclination angle β1 of each roller is 25 °
When the inclination angle α1 is less than 5 °, the friction torque P does not show a sudden change, but the inclination angle β
When 1 is 25 ° or less, the friction torque P is greatly reduced, and it is not possible to obtain a friction torque P that is more than a practically effective value. Also, as shown in FIG. 7, when the rotating body 1 rotates in the reverse direction, the friction torque P uniformly decreases as the inclination angle β1 decreases, regardless of the inclination angle α1. If the angle is more than 20 °, a friction torque P exceeding a practically effective value cannot be obtained irrespective of the magnitude of the inclination angle β1. Further, even when the inclination angle α1 is smaller than 20 °,
If the inclination angle β1 is less than 25 °, a friction torque P exceeding a practically effective value cannot be obtained. Although the case where the inclination angle β1 is larger than 85 ° is not actually confirmed, it is estimated from the above experimental data that the friction torque P up to the inclination angle β1 of 90 ° becomes almost equal to the case where the inclination angle β1 is 85 °. You.

Therefore, according to the rotary friction device of the present embodiment, in a configuration in which the rotating body 1 and the passive body 3 are radially opposed to each other with the plurality of rollers 2 interposed therebetween, the rolling shaft of each roller 2 is The angle α1 formed with respect to the rotation axis of the rotating body 1 is set to be larger than 5 ° and smaller than 20 °, and the angle β1 formed by the rolling axis of each roller 2 with respect to the plane including the rotation axis of the rotating body 1 is set. By making the angle larger than 25 ° and smaller than 90 °, it is possible to always generate an effective and stable friction torque P. In addition, since different frictional forces can be generated depending on the rotation direction of the rotating body 1,
This is extremely advantageous when such an operation is intended.

Further, in the configuration of the above-described embodiment, in FIG.
When the inner raceway surface 1a and the outer raceway surface 3a are uniformly contacted in the axial direction with the inner raceway surface 1a and the outer raceway surface 3a, The contact pressure at both ends in the axial direction becomes larger than that at the center. Therefore, as shown in FIG. 9, if the inner raceway surface 1a and the outer raceway surface 3a in the cross section including the rolling axis of the roller 2 are each formed into a curved shape so as to be convex with respect to the outer peripheral surface of the roller 2, The contact pressure at both ends in the axial direction can be reduced. Therefore, by forming the curved shapes of the raceway surfaces 1a and 3a so that the contact pressure in the axial direction of the roller 2 becomes uniform, uneven wear of the roller 2 can be reduced. As shown in FIG. 10, the inner raceway surface 1a and the outer raceway surface 3a
Is formed in a straight line, the same effect as described above can be obtained by forming the outer peripheral surface of the roller 2 into a curved shape that is convex with respect to each of the raceway surfaces 1a and 3a.

FIGS. 11 to 13 show a second embodiment of the present invention. FIG. 11 is a plan view of a main part showing the arrangement of rollers and balls, FIG. 12 is a schematic view showing the inclination angle of the rollers,
FIG. 13 is a diagram showing the relationship between the inclination angle of the roller and the friction torque.

That is, in this embodiment, each roller 2 is alternately inclined in the opposite direction by the same number with respect to a plane including the rotation axis of the rotating body 1. As shown in FIG.
The rolling shaft 2a has a predetermined inclination angle α2 with respect to the rotating shaft 1b of the rotating body 1 and has a predetermined angle with respect to a plane including the rotating shaft 1b of the rotating body 1 as shown in FIG. Makes an inclination angle β2. In this case, the inclination angle α2 of each roller 2 is set to be larger than 3 ° and smaller than 20 °, and the inclination angle β2 is set to be larger than 25 ° and smaller than 90 °. The inclination angle β2 is an angle as viewed from a direction perpendicular to the rolling shaft 2a of the roller 2.

With the above configuration, in the above-described rotary friction device, each roller 2 and the rotating body 1 are arranged in the same manner as in the first embodiment.
A frictional force proportional to the load F in the axial direction can be generated between the motor and the passive body 3. In this case, since each roller 2 is alternately inclined in the opposite direction by the same number with respect to the plane including the rotation axis of the rotating body 1, the same frictional force is generated in any rotating direction of the rotating body 1.

In the present embodiment, the applicant determines the relationship between the inclination angles α2, β2 of each roller and the friction torque P by using the inclination angle α2
Was in the range of 3 ° to 40 ° and the inclination angle β2 was in the range of 5 ° to 85 °.

That is, as shown in FIG. 13, when the inclination angle α2 of each roller is small, the friction torque P uniformly decreases as the inclination angle β2 decreases.
If the angle is greater than 0 °, a friction torque P exceeding a practically effective value cannot be obtained irrespective of the magnitude of the inclination angle β2. Further, even when the inclination angle α2 is smaller than 20 °, the inclination angle β
2 is 25 ° or less, the friction torque P is not less than a practically effective value.
Can not be obtained. Although the case where the inclination angle β2 is larger than 85 ° is not actually confirmed, it is estimated from the above experimental data that the friction torque P up to the inclination angle β2 of 90 ° is almost equal to the case where the inclination angle β2 is 85 °. You.

In the above-described embodiment, the case where each roller 2 is alternately inclined in the opposite direction by the same number with respect to the plane including the rotation axis of the rotating body 1 has been described, but as shown in FIG. May be inclined in opposite directions by different numbers. In this case, as shown in FIG. 15, rollers 2 (indicated by oblique lines in the figure), which are located at equal intervals in the circumferential direction at least at a total of three places in the circumferential direction of the rotating body 1, are respectively inclined in the direction opposite to the other rollers 2. Thereby, the rotation of the rotating body 1 can be stabilized.

In each of the above embodiments, the roller 2 and the ball 5 are alternately arranged alternately. However, as shown in FIG. 14 or FIG. May be arranged alternately.

[0046]

As described above, according to the rotary friction device of the first aspect, the rotating body and the passive body can be accurately held at the predetermined relative positions in the axial direction. In this case, the function as the rotary friction device can be maintained independently without depending on the precision of the peripheral structure, which is extremely convenient for designing and manufacturing the peripheral structure.

According to the rotary friction device of the second aspect,
In addition to the effect of the first aspect, since different frictional forces can be generated depending on the rotation direction of the rotating body, it is extremely advantageous when such an operation is intended.

According to the rotary friction device of claim 3,
In addition to the effect of the first aspect, since the magnitude of the frictional force in each rotation direction of the rotating body can be arbitrarily set, it can be widely applied depending on the application.

According to the rotary friction device of the fourth aspect,
In addition to the effect of the third aspect, since the same frictional force can be generated when the rotating body is rotated in any direction, it is extremely advantageous when such an operation is intended.

According to the rotary friction device of the fifth and sixth aspects, in addition to the effects of the first, second, third and fourth aspects, the contact pressure between the rotating body and the passive body at both axial ends of the roller is reduced. Therefore, uneven wear of the roller can be reduced, and durability can be improved.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a rotary friction device showing a first embodiment of the present invention.

FIG. 2 is a side sectional view of a main part of the rotary friction device.

FIG. 3 is a main part plan view showing the arrangement of rollers and balls.

FIG. 4 is a schematic diagram showing the inclination angle of a roller.

FIG. 5 is an explanatory view of the operation of the rotary friction device.

FIG. 6 is a diagram showing a relationship between a roller inclination angle and friction torque.

FIG. 7 is a diagram illustrating a relationship between a roller inclination angle and friction torque.

FIG. 8 is a cross-sectional view taken along the line II in FIG. 3 showing a case where each track surface and the outer peripheral surface of the roller are formed in a straight line.

9 shows an example in which each track surface is formed in a curved shape; FIG.
-I sectional view in the direction of the arrow

10 is a cross-sectional view taken along line II of FIG. 3 showing an example in which the outer peripheral surface of the roller is formed in a curved shape.

FIG. 11 is a main part plan view showing a second embodiment of the present invention.

FIG. 12 is a schematic diagram illustrating a tilt angle of a roller.

FIG. 13 is a diagram illustrating a relationship between a roller inclination angle and friction torque.

FIG. 14 is a main part plan view showing another example of the arrangement of rollers and balls.

FIG. 15 is a main part plan view showing another example of the arrangement of rollers and balls.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotating body, 1b ... Groove, 2 ... Roller, 3 ... Passive body, 3b
... grooves, 4 ... cages, 5 ... balls.

Claims (6)

[Claims] 1. A rotating body that rotates about an axis, a number of rollers arranged along a rotation trajectory of the rotating body, and a passive body that radially faces the rotating body with each roller interposed therebetween. A holding member that holds each roller so as to be rotatable at an interval from each other, and inclines the rolling axis of each roller so as to form a predetermined angle with respect to the rotation axis of the rotating body; In a rotary friction device in which a dynamic axis is inclined in a predetermined direction so as to form a predetermined angle with respect to a plane including a rotation axis of a rotating body, the rotating body and the passive body extend in a circumferential direction provided on respective opposing surfaces. A plurality of balls which are rotatably engaged with the grooves so as to be relatively rotatably engaged, and at least one of the grooves is formed so that each ball can be moved by a predetermined distance in the axial direction of the rotating body. Rotating friction device. 2. The method according to claim 1, wherein the angle of inclination of the rolling axis of each roller with respect to the rotating axis of the rotating body is greater than 5 ° and less than 20 °. With respect to the plane including the same plane, and the inclination angle is 2
2. The rotary friction device according to claim 1, wherein the rotation friction device is larger than 5 [deg.] And smaller than 90 [deg.]. 3. The method according to claim 1, wherein the angle of inclination of the rolling axis of each roller with respect to the rotating axis of the rotating body is greater than 3 ° and less than 20 °. 2. The rotary friction device according to claim 1, wherein the inclined surfaces are inclined by a predetermined number in opposite directions with respect to the plane including the inclined plane, and the inclination angle is greater than 25 degrees and smaller than 90 degrees. 4. The rotary friction device according to claim 3, wherein the same number of rollers that are inclined in directions opposite to each other with respect to a plane including the rotation axis of the rotating body are alternately arranged in the circumferential direction of the rotating body. . 5. A contact surface of the rotating body and the passive body with a roller is formed so as to be convex with respect to an outer peripheral surface of the roller in a cross section including a rolling axis of the roller. Item 5. The rotary friction device according to Item 1, 2, 3, or 4. 6. An outer peripheral surface of a roller contacting the rotating body and the passive body is formed so as to be convex with respect to a contact surface of the rotating body and the passive body in a cross section including a rolling axis of the roller. The rotary friction device according to claim 1, 2, 3, or 4, wherein