JP2023044273A - Rotation transmission device and steer-by-wire steering device for vehicle - Google Patents

Abstract

To improve reliability of a rotation transmission device that causes a corresponding first or second engaging member to engage an engagement face of a first rotating body and an inner peripheral face of a second rotating body by means of a corresponding first or second armature to be magnetically attracted to a corresponding first or second rotor with a first or second electromagnet.SOLUTION: A rotation transmission device is provided with a first slit that penetrates a first rotor in an axial direction at a position between a first electromagnet and a first armature and a second slit that penetrates a second rotor in the axial direction at a position between a second electromagnet and a second armature. A case 16 is made of a non-magnetic material.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation transmission device used for switching between transmission and interruption of rotation between two shafts, and a vehicle steer-by-wire steering system including the same.

Conventionally, there is a steer-by-wire steering system for a vehicle, which includes a steering wheel, a steering device for changing the direction of the wheels, and a rotation transmission device incorporated between the steering wheel and the steering device. The steering device turns the wheels by a steering force input to the steering wheel from an actuator or a driver. Normally, since the actuator changes the direction of the wheels, the rotation transmission device mechanically separates the steering wheel side and the steering device side, and does not output the steering force to the steering device side. On the other hand, in the event of an abnormality, the rotation transmission device mechanically connects the steering wheel side and the steering device side, and outputs the steering force to the steering device side. As a rotation transmission device used in this type of vehicle steer-by-wire steering system, there is one that can electromagnetically switch between rotation transmission and interruption (Patent Document 1).

In the rotation transmission device disclosed in Patent Document 1, a first rotating body is provided with engaging surfaces at a plurality of locations in the circumferential direction, and a second rotating body is provided with an inner peripheral surface surrounding the plurality of engaging surfaces. for arranging a plurality of first engaging members and second engaging members between the plurality of engaging surfaces and the inner peripheral surface and engaging the first engaging members with the engaging surfaces and the inner peripheral surface; A first armature, a first rotor, and a first electromagnet are provided, and a second armature, a second rotor, and a second electromagnet for engaging the second engaging member with the engaging surface and the inner peripheral surface. Electromagnets are provided and the first and second armatures are respectively provided with first or second retainers for converting axial movement thereof into engagement directional movement of the corresponding first or second engagement member. provided, the aforementioned engaging surface, inner peripheral surface, first and second engaging members, first and second rotors, and first and second armatures are accommodated in a case, and the first rotating body and One side of the second rotating body is connected to the steering wheel side, and the other side is connected to the steering device side.

In the rotation transmission device disclosed in Patent Document 1, when the vehicle steer-by-wire steering system is operated normally, the first and second electromagnets are not energized and are in a non-excited state. The second armature is kept spaced apart from the corresponding first or second rotor, and the corresponding first or second engaging member is adapted to counter-narrow the wedge space formed by the engaging surface and the inner peripheral surface. kept on the side. Therefore, the rotation transmission device is maintained in a released state in which rotation transmission between the first rotating body and the second rotating body is interrupted. On the other hand, when the vehicle steer-by-wire steering system malfunctions, when at least one of the first and second electromagnets is energized to be in an excited state, the corresponding first or second armature moves the armature in the axial direction. Or magnetically attracted to the second rotor, at this time, the corresponding first or second engaging member is pushed to the narrow side of the wedge space by the corresponding first or second holding portion to form the engaging surface and the inner peripheral surface. Therefore, the rotation transmission device is in an engaged state for transmitting rotation between the first rotating body and the second rotating body via the corresponding first or second engaging member. As described above, the rotation transmission device disclosed in Patent Document 1 normally does not require energization of the first and second electromagnets, and can reduce power consumption. Even if one of the electrical systems of the two electromagnets fails and magnetic attraction cannot be performed, the other remaining second or first electromagnet will engage the corresponding second or first engaging member. Rotation can be transmitted between the first rotating body and the second rotating body by engaging them.

Japanese Patent No. 6491404

However, in the rotation transmission device disclosed in Patent Document 1, the armature-side side surface of each of the first and second rotors is entirely solid. When excited, less magnetic flux is delivered from the corresponding first or second rotor to the corresponding first or second armature, and the force magnetically attracting the corresponding first or second armature is weak. Moreover, since the first and second rotors and the first rotating body are connected directly or via bearings, magnetic leakage is likely to occur. Therefore, when the magnetic forces of the first and second electromagnets are reduced, the magnetic attraction of the corresponding first or second armature tends to be insufficient, and the reliability of the rotation transmission device is uncertain.

Further, in the rotation transmission device disclosed in Patent Document 1, the second electromagnet is axially supported by the inner peripheral step of the case. On the other hand, there is a concern that it may be displaced to the second rotor side and the air gap with the second rotor cannot be maintained appropriately, and there is concern about the reliability of the rotation transmission device.

Further, in the rotation transmission device disclosed in Patent Document 1, the space between the case and the second rotating body, which is on the side of the steering device near the ground, is sealed with a seal to prevent the intrusion of foreign matter and the leakage of lubricant. However, there is a possibility that foreign matter such as magnetic powder enters from the side of the first rotor, leading to malfunction, and there is concern about the reliability of the rotation transmission device.

Further, in the rotation transmission device disclosed in Patent Document 1, the axial movement of the corresponding first or second armature magnetically attracted to the first or second electromagnet is caused by the corresponding first or second rotor. Since it collides and is stopped, there is a concern that the collision sound becomes noise and gives a feeling of uneasiness to the reliability of the rotation transmission device.

Accordingly, the problem to be solved by the present invention is to provide a corresponding first or second armature that is magnetically attracted to a corresponding first or second rotor by a first or second electromagnet. To improve the reliability of a rotation transmission device that engages two engaging members with the engaging surface of a first rotating body and the inner peripheral surface of a second rotating body.

A first invention for achieving the above object comprises a first rotating body having a plurality of engaging surfaces in a circumferential direction, and a second rotating body having an inner peripheral surface surrounding the plurality of engaging surfaces. , a first engaging member arranged movably between a locked position in which it engages with said engaging surface and said inner peripheral surface and a free position in which said engaging surface and said inner peripheral surface cannot be engaged; a second engaging member, a first armature and a second armature arranged axially movably with respect to the first rotating body, and a first armature axially opposing the first armature a rotor, a first electromagnet axially opposed to the first armature with the first rotor interposed therebetween, a second rotor axially opposed to the second armature, and the second a second electromagnet axially opposed to an armature with the second rotor interposed therebetween, wherein the first armature engages the first engagement when axially moved by magnetic attraction of the first electromagnet. a first holding portion for moving a member from the free position to the locked position; and the second armature engages the second engaging member when axially moved by magnetic attraction of the second electromagnet. In the rotation transmission device having a second holding portion that moves from the free position to the locked position, the first rotor axially penetrates the first rotor at a position between the first electromagnet and the first armature. and a second slit axially penetrating the second rotor at a position between the second electromagnet and the second armature. be.

According to the first aspect of the invention, the first slit axially penetrates the first rotor at a position between the first electromagnet and the first armature. When the electromagnet is energized, more magnetic flux is transferred between the first rotor and the first armature at the first slit, and a force magnetically attracts the first armature to the first rotor. and when the second electromagnet is energized, more magnetic flux is transferred between the second rotor and the second armature at the second slit, magnetically moving the second armature to the second armature. It is possible to improve the reliability of the rotation transmission device by strengthening the force of attraction to the rotor.

A second aspect of the invention for achieving the above object is a first rotating body having a plurality of engaging surfaces in the circumferential direction, and a second rotating body having an inner peripheral surface surrounding the plurality of engaging surfaces. , a first engaging member arranged movably between a locked position in which it engages with said engaging surface and said inner peripheral surface and a free position in which said engaging surface and said inner peripheral surface cannot be engaged; a second engaging member, a first armature and a second armature arranged axially movably with respect to the first rotating body, and a first armature axially opposing the first armature a rotor, a first electromagnet axially opposed to the first armature with the first rotor interposed therebetween, a second rotor axially opposed to the second armature, and the second a second electromagnet axially opposed to an armature with the second rotor interposed therebetween, wherein the first armature engages the first engagement when axially moved by magnetic attraction of the first electromagnet. a first holding portion for moving a member from the free position to the locked position; and the second armature engages the second engaging member when axially moved by magnetic attraction of the second electromagnet. In the rotation transmission device having a second holding portion that moves from the free position to the locked position, a first non-magnetic body disposed between the first rotating body and the first rotor; A configuration including a second non-magnetic body arranged between one rotating body and the second rotor is adopted.

According to the configuration according to the second aspect of the invention, magnetic leakage from the first rotor and the second rotor to the first rotor is suppressed by the first non-magnetic material and the second non-magnetic material. It is possible to prevent a decrease in the magnetic attraction force and improve the reliability of the rotation transmission device.

A third aspect of the invention for achieving the above object is a first rotating body having a plurality of engaging surfaces in the circumferential direction, and a second rotating body having an inner peripheral surface surrounding the plurality of engaging surfaces. , a first engaging member arranged movably between a locked position in which it engages with said engaging surface and said inner peripheral surface and a free position in which said engaging surface and said inner peripheral surface cannot be engaged; a second engaging member, a first armature and a second armature arranged axially movably with respect to the first rotating body, and a first armature axially opposing the first armature a rotor, a first electromagnet axially opposed to the first armature with the first rotor interposed therebetween, a second rotor axially opposed to the second armature, and the second A second electromagnet axially opposed to the armature with the second rotor interposed therebetween, the engaging surface, the inner peripheral surface, the first and second engaging members, and the first and second rotors and a case housing the first and second armatures, wherein the first armature moves the first engaging member to the free position when axially moved by magnetic attraction of the first electromagnet. to the locked position, and the second armature moves the second engaging member from the free position to the locked position when axially moved by magnetic attraction of the second electromagnet. In the rotation transmission device having the second holding portion that moves to the position, the case adopts a configuration formed of a non-magnetic material.

According to the configuration according to the third aspect of the invention, since magnetic leakage from the first electromagnet and the second electromagnet to the case does not occur, it is possible to prevent a decrease in the magnetic attraction force and improve the reliability of the rotation transmission device. can.

A fourth aspect of the invention for achieving the above object is a first rotating body having a plurality of engaging surfaces in the circumferential direction, and a second rotating body having an inner peripheral surface surrounding the plurality of engaging surfaces. , a first engaging member arranged movably between a locked position in which it engages with said engaging surface and said inner peripheral surface and a free position in which said engaging surface and said inner peripheral surface cannot be engaged; a second engaging member, a first armature and a second armature arranged axially movably with respect to the first rotating body, and a first armature axially opposing the first armature a rotor, a first electromagnet axially opposed to the first armature with the first rotor interposed therebetween, a second rotor axially opposed to the second armature, and the second A second electromagnet axially opposed to the armature with the second rotor interposed therebetween, the engaging surface, the inner peripheral surface, the first and second engaging members, and the first and second rotors and a case housing the first and second armatures, wherein the first armature moves the first engaging member to the free position when axially moved by magnetic attraction of the first electromagnet. to the locked position, and the second armature moves the second engaging member from the free position to the locked position when axially moved by magnetic attraction of the second electromagnet. A rotation transmission device having a second holding portion for moving to a position, comprising a stopper member attached to the case so as to restrict axial movement of the second electromagnet toward the second rotor. It has been adopted.

According to the fourth aspect of the invention, even if vibration or shock acts on the second electromagnet, displacement of the second electromagnet toward the second rotor is restricted by the stopper member. By appropriately maintaining the air gap between the electromagnet and the second rotor, the reliability of the rotation transmission device can be improved.

A fifth aspect of the invention for achieving the above object is a first rotating body having a plurality of engaging surfaces in a circumferential direction, and a second rotating body having an inner peripheral surface surrounding the plurality of engaging surfaces. , a first engaging member arranged movably between a locked position in which it engages with said engaging surface and said inner peripheral surface and a free position in which said engaging surface and said inner peripheral surface cannot be engaged; a second engaging member, a first armature and a second armature arranged axially movably with respect to the first rotating body, and a first armature axially opposing the first armature a rotor, a first electromagnet axially opposed to the first armature with the first rotor interposed therebetween, a second rotor axially opposed to the second armature, and the second A second electromagnet axially opposed to the armature with the second rotor interposed therebetween, the engaging surface, the inner peripheral surface, the first and second engaging members, and the first and second rotors and a case housing the first and second armatures, wherein the first armature moves the first engaging member to the free position when axially moved by magnetic attraction of the first electromagnet. to the locked position, and the second armature moves the second engaging member from the free position to the locked position when axially moved by magnetic attraction of the second electromagnet. In a rotation transmission device having a second holding portion for moving to a position, a gasket interposed between the outer periphery of the first electromagnet and the case, and the inner periphery of the first rotating body and the first electromagnet and a seal interposed between.

According to the fifth aspect of the invention, the gasket seals between the first electromagnet and the case, and the seal seals between the first rotor and the first electromagnet. The reliability of the rotation transmission device can be improved by preventing malfunction due to the entry of foreign matter.

A sixth aspect of the invention for achieving the above object is a first rotating body having a plurality of engaging surfaces in a circumferential direction, and a second rotating body having an inner peripheral surface surrounding the plurality of engaging surfaces. , a first engaging member arranged movably between a locked position in which it engages with said engaging surface and said inner peripheral surface and a free position in which said engaging surface and said inner peripheral surface cannot be engaged; a second engaging member, a first armature and a second armature arranged axially movably with respect to the first rotating body, and a first armature axially opposing the first armature a rotor, a first electromagnet axially opposed to the first armature with the first rotor interposed therebetween, a second rotor axially opposed to the second armature, and the second a second electromagnet axially opposed to an armature with the second rotor interposed therebetween, wherein the first armature engages the first engagement when axially moved by magnetic attraction of the first electromagnet. a first holding portion for moving a member from the free position to the locked position; and the second armature engages the second engaging member when axially moved by magnetic attraction of the second electromagnet. In the rotation transmission device having a second holding portion that moves from the free position to the locked position, a first cushioning member that absorbs impact when the first armature is attracted to the first rotor; and a second cushioning member that absorbs impact when the two armatures are attracted to the second rotor.

According to the sixth aspect of the invention, collision between the first armature and the first rotor is mitigated by the first cushioning member, and collision between the second armature and the second rotor is reduced by the second Since it is relieved by the cushioning member, it is possible to suppress collision noise and improve the reliability of the rotation transmission device.

The above first to sixth inventions may be configured as a rotation transmission device by combining a plurality of suitably selected inventions or all inventions.

Thus, each of the first to sixth inventions provides a corresponding first or second armature that is magnetically attracted to a corresponding first or second rotor by a first or second electromagnet. It is possible to improve the reliability of the rotation transmission device that engages the first or second engaging member with the engaging surface of the first rotating body and the inner peripheral surface of the second rotating body.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the rotation transmission device which concerns on 1st embodiment of this invention Sectional drawing which cut|disconnected the rotation transmission device shown in FIG. 1 at radial direction FIG. 2 is an exploded view of the configuration around the first and second armatures and engaging members shown in FIG. 1 opened to the outside; FIG. 2 is a side view of the first rotor shown in FIG. 1; FIG. 2 is a cross-sectional view showing a main part of a rotation transmission device according to a second embodiment of the invention; Sectional view showing a main part of a rotation transmission device according to a third embodiment of the present invention Sectional drawing which shows the principal part of the rotation transmission device which concerns on 4th embodiment of this invention Sectional drawing which shows the principal part of the rotation transmission device which concerns on 5th embodiment of this invention Schematic diagram showing an example of a vehicle steer-by-wire steering system according to the present invention

A rotation transmission device according to a first embodiment as an example corresponding to the first and third inventions will be described below with reference to FIGS. 1 to 4 of the accompanying drawings.

A rotation transmission device 1 shown in FIG. A plurality of first engaging members 4 and a plurality of second engaging members 5 arranged therebetween, a plurality of elastic members 6 for controlling the positions of these engaging members 4 and 5, and a first armature. 7, a second armature 8, a first rotor 9, a second rotor 10, a first electromagnet 11 and a second electromagnet 12, and a first armature for supporting the first and second rotating bodies 2,3 1 to 3rd bearings 13 to 15 and a case 16 for accommodating them as basic constituent elements. The first and second rotors 2, 3 are arranged on the same axis CL.

Here, the direction along the axis CL is called the "axial direction" and corresponds to the left-right direction in FIG. A direction perpendicular to the axis CL is referred to as a "radial direction", which corresponds to the vertical direction in FIG. In the radial direction, a direction approaching the axis CL is referred to as "radial inner side", and a direction away from the axis CL is referred to as "radial outer side". Also, the direction along the circumference of a circle around the axis CL is referred to as the "circumferential direction".

As shown in FIGS. 1 and 2, the first rotating body 2 has a shaft member 17 serving as the center of rotation of the first rotating body 2 and a torque transmission member 18 connected to the shaft member 17 .

The torque transmission member 18 is an annular body including engaging surfaces 19 at a plurality of locations in the circumferential direction on the outer circumference and a shaft coupling 20 on the inner circumference. The outer diameter of the torque transmission member 18 is larger than the diameter of the shaft member 17 and is the maximum outer diameter of the first rotor 2 .

The shaft coupling 20 has a spline hole and is fitted with the spline shaft portion of the shaft member 17 . The torque transmission member 18 is housed in the case 16 . The shaft member 17 extends outside the case 16 .

The overall shape of the shaft member 17 and the torque transmission member 18 is formed by forging a magnetic material such as steel.

As shown in FIG. 2, the outer circumference of the torque transmission member 18 has a polygonal shape when viewed from the axial direction. Each of the plurality of engaging surfaces 19 is a flat surface forming one side of the aforementioned polygonal shape. In the illustrated example, the first rotating body 2 is divided into the shaft member 17 and the torque transmission member 18 in order to improve the precision of the forged product and the precision of the engaging surface 19 .

The second rotating body 3 shown in FIG. 1 has an inner peripheral surface 21 surrounding the plurality of engaging surfaces 19 and a shaft 22 serving as the center of rotation of the second rotating body 3 .

The inner peripheral surface 21 has a diameter larger than the outer diameter of the torque transmission member 18 . The inner peripheral surface 21 and the engaging surface 19 form a wedge space that radially narrows from the circumferential central portion of the engaging surface 19 toward the circumferential direction.

The shaft 22 extends to the outside of the case 16 on the opposite side of the shaft member 17 in the axial direction. The shaft 22 and the inner peripheral surface 21 are integrally formed. It should be noted that the inner peripheral surface 21 and the shaft 22 may be separate members, and these members may be connected to form the second rotating body.

The shaft member 17 and the shaft 22 are used for connection with rotation transmission paths of other devices, respectively.

As shown in FIGS. 2 and 3, the first engaging member 4 and the second engaging member 5 each consist of a roller arranged to be able to roll on the inner peripheral surface 21 in the circumferential direction. The specifications of the first engaging member 4 and the second engaging member 5 are the same. The plurality of first engaging members 4 and the plurality of second engaging members 5 are arranged on the same circumference. The total number of engaging surfaces 19, the total number of first engaging members 4, and the total number of second engaging members 5 are the same. One first engaging member 4 and one second engaging member 5 are arranged between the engaging surface 19 and the inner peripheral surface 21 at one place.

In the illustrated example, four first engaging members 4 and four second engaging members 5 are arranged inside the inner peripheral surface 21 . A pair of the first engaging members 4 are arranged near the proximal end side (the side where the above-mentioned wedge space is narrowed) of the engaging surfaces 19, 19 adjacent in the circumferential direction. Similarly, the second engaging members 5 are also arranged in pairs on the proximal end side (the side where the aforementioned wedge space is narrowed) of the engaging surfaces 19, 19 adjacent in the circumferential direction. .

An elastic member 6 is arranged between the first engaging members 4, 4 of each pair. Similarly, elastic members 6 are also arranged between the second engaging members 5, 5 of each pair. The elastic member 6 consists of a compression coil spring. The elastic member 6 is arranged in a direction (the wedge direction to narrow the space).

A groove portion 23 is formed on the outer circumference of the torque transmission member 18 between the engaging surfaces 19, 19 adjacent in the circumferential direction. The four grooves 23 hold the elastic members 6 respectively.

The first and second armatures 7 and 8 are arranged so as to be axially movable relative to the first rotary body 2 and non-rotatable relative to each other.

The illustrated first and second armatures 7 and 8 are each made of an annular magnetic body, and are spline-fitted to the first rotating body 2 at their inner peripheries.

As shown in FIGS. 1 to 3, the first armature 7 includes a plurality of first holding portions projecting axially to one side (to the right in FIGS. 1 and 3) from a radially extending first disk portion 24. 25a and 25b. The first disk portion 24 is positioned on the other axial side (left side in FIGS. 1 and 3) with respect to the plurality of first engaging members 4 and the plurality of second engaging members 5 . The plurality of first holding portions 25a, 25b are inserted inside the inner peripheral surface 21 so as to be positioned on both sides in the circumferential direction with respect to the pair of first engaging members 4, 4. As shown in FIG. A first holding portion 25a located on one side in the circumferential direction with respect to the pair of first engaging members 4, 4 and the other side in the circumferential direction with respect to the pair of first engaging members 4, 4. The first holding portion 25b located on the side is provided symmetrically in the circumferential direction.

A pair of first holding portions 25a, 25b that are symmetrical in the circumferential direction have first slopes 26a, 26b that are circumferentially inclined with respect to the axial direction. The pair of first slopes 26a and 26b are inclined so as to come closer to each other in the circumferential direction toward one side in the axial direction. A pair of engaging members 4, 4 are sandwiched by a pair of first slopes 26a, 26b.

A first slider 27a is interposed between the first slope 26a and the engaging member 4 closest thereto. The first slider 27a contacts the first slope 26a on the slope 28a along the first slope 26a, and contacts the engaging member 4 on the surface 29a along the axial direction. Similarly, a first slider 27b is interposed between the first slope 26b and the engagement member 4 closest to it, and the first slider 27b is a slope along the first slope 26b. It contacts the first slope 26b at 28b and contacts the engaging member 4 at a surface 29b along the axial direction. These first sliders 27a and 27b are for stabilizing the posture of the engaging member 4 so that the roller axis of the engaging member 4 faces the axial direction.

When the first armature 7 moves to the other side in the axial direction (left side in FIGS. 1 and 3), the pair of slopes 26a and 26b, the corresponding sliders 27a and 27b, and the corresponding first engaging member 4 move. At the contact portion, a component force is generated that pushes the pair of first engaging members 4, 4 in the direction of approaching them in the circumferential direction. This component force causes the pair of first engaging members 4, 4 and sliders 27a, 27b to approach each other in the circumferential direction. It is moved circumferentially in a narrower direction.

The second armature 8 has a plurality of second holding portions 31a and 31b protruding from the second disk portion 30 extending in the radial direction to the other side in the axial direction. The second disk portion 30 is located on one side in the axial direction with respect to the plurality of first engaging members 4 and the plurality of second engaging members 5 . The plurality of second holding portions 31a, 31b are inserted inside the inner peripheral surface 21 so as to be positioned on both sides in the circumferential direction with respect to the pair of second engaging members 5, 5. As shown in FIG. A second holding portion 31a positioned on one side in the circumferential direction with respect to the pair of second engaging members 5, 5 and the other side in the circumferential direction with respect to the pair of second engaging members 5, 5 The second holding portion 31b located on the side is provided symmetrically in the circumferential direction.

A pair of second holding portions 31a, 31b that are symmetrical in the circumferential direction have second slopes 32a, 32b that are circumferentially inclined with respect to the axial direction. The relationship between the second slopes 32a, 32b and the pair of second engaging members 5, 5 is the first holding portions 25a, 25b and the pair of first engaging members 4. , 4 is reversed with respect to the directionality in the axial direction. Therefore, when the second armature 8 moves to one side in the axial direction, the pair of second slopes 32a and 32b, the corresponding second sliders 33a and 33b, and the corresponding second engaging member 5 move. At the contact portion, a component force is generated that pushes the pair of second engaging members 5, 5 in the direction of approaching them in the circumferential direction. Due to this component force, each second engaging member 5 is moved in the circumferential direction to narrow the aforementioned wedge space.

As shown in FIG. 1 , the first rotor 9 is provided so as to be rotatable integrally with the first rotating body 2 and unable to move relative to the first rotating body 2 in the axial direction. The first rotor 9 includes an inner cylinder 34 extending in the axial direction, an end wall 35 extending radially outward from one end of the inner cylinder 34 in the axial direction, and an outer cylinder extending from the end wall 35 to the other axial side. 36. One axial end of the inner cylinder 34 and the end wall 35 form a flat end surface 37 along the radial direction. The inner cylinder 34, the end wall 35 and the outer cylinder 36 are integrally formed of a magnetic material.

The inner cylinder 34 and the shaft member 17 are spline-fitted to each other. An inner diameter side end portion of the end surface 37 abuts against a shoulder portion of the shaft member 17 in the axial direction. The other axial end of the inner cylinder 34 is axially supported by a retaining ring 38 attached to the shaft member 17 . Axial movement of the first rotor 9 with respect to the shaft member 17 is restricted by the shoulder portion of the shaft member 17 and the retaining ring 38 .

The first electromagnet 11 is an annular body with the axis CL as a reference. The first electromagnet 11 comprises a first field core 39 fitted to the case 16 and a first electromagnetic coil 40 wound around the first field core 39 . The first electromagnet 11 is arranged on the other side of the first rotor 9 in the axial direction (the side opposite to the first armature 7 ).

When the first electromagnetic coil 40 is not energized, an axial air gap is provided between the first armature 7 and the first rotor 9, as shown in FIG. ing.

As shown in FIGS. 1 and 4, the end wall 35 of the first rotor 9 is formed with a first slit 41 that axially penetrates the first rotor 9 . The first slits 41 are arranged at two or more locations in the circumferential direction so as to be positioned between the first electromagnet 11 and the first armature 7 . These first slits 41 are arranged on the same circumference and extend in an arc shape. When the magnetic flux generated by the first electromagnet 11 enters the first rotor 9, part of the magnetic flux does not cross the first slit 41, which is a space, and passes through the first armature 7 with a relatively small air gap. , and then returns from the first armature 7 to the first rotor 9 , so the exchange of magnetic flux between the first rotor 9 and the first armature 7 increases.

The second rotor 10 is provided so as to be rotatable integrally with the second rotor 3 and axially immovable relative to the first and second rotors 2 and 3 . The second rotor 10 is made of magnetic material. The second rotor 10 is a disk portion that connects the inner peripheral surface 21 of the second rotor 3 and the shaft 22 . Although the illustration shows an example in which the second rotor 10, the inner peripheral surface 21, and the shaft 22 are integrally formed, the second rotor may be formed as a separate part from the shaft 22. It is also possible to make the second rotor independent from the second rotating body and to provide it in the first rotating body.

The second electromagnet 12 is an annular body with the axis CL as a reference. The second electromagnet 12 comprises a second field core 42 fitted to the case 16 and a second electromagnetic coil 43 wound around the second field core 42 . The second electromagnet 12 is arranged on one axial side of the second rotor 10 (the side opposite to the second armature 8 ).

When the second electromagnetic coil 43 is not energized and in a non-excited state, an axial air gap is provided between the second armature 8 and the second rotor 10 as shown in FIG. ing.

The second rotor 10 is formed with a second slit 44 axially penetrating through the second rotor 10 at a position between the second electromagnet 12 and the second armature 8 . The second slits 44 are arcuately formed at two or more locations in the circumferential direction, similar to the first slits 41 shown in FIG. When the magnetic flux generated by the second electromagnet 12 shown in FIG. 1 enters the second rotor 10, part of the magnetic flux does not cross the second slit 44, which is a space, and the second slit 44 having a relatively small air gap. Since it goes to the second armature 8 and then returns from the second armature 8 to the second rotor 10, the transfer of magnetic flux between the second rotor 10 and the second armature 8 increases.

The first bearing 13 rotatably supports the first rotor 2 with respect to the case 16 . The second bearing 14 rotatably supports the second rotor 3 with respect to the case 16 . The outer circumference of the first rotor 2 and the inner circumference of the second rotor 3 are supported by a third bearing 15 so as to be relatively rotatable. The first to third bearings 13 to 15 are non-separable rolling bearings capable of supporting loads in both axial directions.

The first bearing 13 is interposed between the inner circumference of the first field core 39 and the first rotor 2 . The outer ring of the first bearing 13 abuts against a shoulder formed on the inner circumference of the first field core 39 in the axial direction. The inner ring of the first bearing 13 abuts against the shoulder of the shaft member 17 in the axial direction. The outer ring of the first bearing 13 is restricted from moving to the other side in the axial direction, which is the direction in which it escapes from the first field core 39 , by the retaining means 45 . The outer periphery of the first field core 39 is fitted to the inner periphery of the case 16 , and the first field core 39 is prevented from coming out of the case 16 by means of retaining means 46 attached to the inner periphery of the case 16 . is restricted from moving to the other side in the axial direction. Each of the retaining means 45 and 46 consists of a retaining ring. The inner ring of the second bearing 14 abuts against a shoulder formed on the outer circumference of the second rotating body 3 in the axial direction. The outer ring of the second bearing 14 axially abuts a shoulder formed on the inner circumference of the case 16 . The inner ring of the third bearing 15 abuts against a shoulder formed on the outer circumference of the first rotating body 2 in the axial direction. Further, the outer ring of the third bearing 15 abuts against the shoulder formed on the inner circumference of the second rotating body 3 in the axial direction. By these first to third bearings 13 to 15 and retaining means 45 and 46, the first rotating body 2, the second rotating body 3 and the first electromagnet 11 are arranged in a predetermined axial direction with respect to the case 16. kept in position.

The second field core 42 is press-fitted into the inner periphery of the case 16 , and the end face on one axial side of the second field core 42 abuts against the inner peripheral stepped portion of the case 16 . By this press fitting, the second electromagnet 12 is axially and radially positioned with respect to the case 16 .

Since the torque transmission member 18 is axially sandwiched between the third bearing 15 and the first rotor 9 described above, it is restrained in a state in which it cannot move axially relative to the shaft member 17 . The first and second engaging members 4 and 5 are held together by a stepped portion 47 provided on the inner periphery of the second rotating body 3 and a stopper ring 48 attached to the inner periphery of the second rotating body 3. It is kept in a predetermined axial position with respect to the first and second rotors 2,3.

Case 16 is made of a non-magnetic material. Therefore, magnetic leakage to the case 16 does not occur even if either the first electromagnet 11 or the second electromagnet 12 is in an excited state.

The space between the shaft 22 of the second rotor 3 and the case 16 is sealed by a seal 49 interposed therebetween.

When the first and second electromagnets 11 and 12 are in a non-excited state, the first and second holding portions 25a, 25b, 31a, and 31b are connected to the corresponding elastic members as indicated by solid lines in FIGS. 6, and an axial component force acts on each of the first and second slopes 26a, 26b, 32a, 32b. This component force becomes a force that presses the first armature 7 and the second armature 8 against the torque transmission member 18 . Therefore, the air gap between the first armature 7 and the first rotor 9 and the air gap between the second armature 8 and the second rotor 10 are kept constant. In this non-excited state, the circumferential interval between the pair of first engaging members 4, 4 and the circumferential interval between the pair of second engaging members 5, 5 are large, and each The first and second engaging members 4 and 5 are in a free position where they cannot engage with the corresponding engaging surface 19 and inner peripheral surface 21 . That is, the rotation transmission device 1 shown in FIG. 1 is in a released state in which rotation on either side in the circumferential direction between the first rotor 2 and the second rotor 3 can be blocked.

When the first electromagnet 11 is switched to the excited state, the first armature 7 is magnetically attracted to the first rotor 9 side, moved in the axial direction, and is quickly attracted to the first rotor 9. state. During this movement, the slopes 26a and 26b of the holding portions 25a and 25b of the first armature 7 shown in FIGS. The one engaging members 4, 4 are pushed toward each other in the circumferential direction, and the circumferential interval between the engaging members 4, 4 of each pair gradually decreases. Therefore, when the first armature 7 is attracted to the first rotor 9, each of the first engaging members 4 has a corresponding engaging surface 19 and It is in the locked position where it engages the inner peripheral surface 21 . That is, the rotation transmission device 1 shown in FIG. 1 is switched to an engaged state in which rotation can be transmitted in either direction in the circumferential direction between the first rotating body 2 and the second rotating body 3 . When the first electromagnet 11 is switched from the excited state to the non-excited state, the biasing force of the elastic member 6 pushes the slopes 26a and 26b shown in FIGS. 2 is moved to the side of the torque transmission member 18 shown in FIG. 2, and all the first engaging members 4 shown in FIG. 2 are returned to the free position.

When the second electromagnet 12 shown in FIG. 1 is switched to the energized state, the second armature 8 is magnetically attracted toward the second rotor 10 and is moved in the axial direction, and quickly moves toward the second rotor. It will be in a state of being adsorbed to 10. During this movement, the slopes 32a and 32b of the holding portions 31a and 31b of the second armature 8 shown in FIGS. The two engaging members 5, 5 are pushed toward each other in the circumferential direction, and the circumferential interval between the second engaging members 5, 5 of each pair gradually decreases. Therefore, when the second armature 8 is attracted to the second rotor 10, each of the second engaging members 5 has a corresponding engaging surface 19 and It is in the locked position where it engages the inner peripheral surface 21 . That is, the rotation transmission device 1 shown in FIG. 1 is switched to an engaged state in which rotation can be transmitted in either direction in the circumferential direction between the first rotating body 2 and the second rotating body 3 . When the second electromagnet 12 is switched from the excited state to the non-excited state, the second armature shown in FIG. 8 is moved to the torque transmission member 18 side, and all the second engaging members 5 shown in FIG. 2 are returned to the free position.

2 and 3 are moved to the lock position by the excitation of the first electromagnet 11 shown in FIG. 1, and the excitation of the second electromagnet 12 shown in FIG. 3 to move each second engagement member 5 to the locked position can be performed independently of each other. Therefore, the rotation transmission device 1 shown in FIG. 1 is switched to the engaged state described above by switching at least one of the first electromagnet 11 and the second electromagnet 12 to the excited state.

The rotation transmission device 1 shown in FIGS. The second rotary body 3 having the surface 21 is movable between a locked position in which the engagement surface 19 and the inner peripheral surface 21 are engaged and a free position in which the engagement surface 19 and the inner peripheral surface 21 cannot be engaged. A first engaging member 4 and a second engaging member 5 arranged in the first rotating body 2, and a first armature 7 and a second armature 8 arranged to be axially movable with respect to the first rotating body 2 , a first rotor 9 axially opposed to the first armature 7, a first electromagnet 11 axially opposed to the first armature 7 with the first rotor 9 interposed therebetween, and a second armature 8, and a second electromagnet 12 axially facing the second armature 8 with the second rotor 10 interposed therebetween. It has first holding portions 25a and 25b for moving the first engaging member 4 from the free position to the locked position when the first electromagnet 11 is moved in the axial direction by magnetic attraction, and the second armature 8 is the second electromagnet. Since it has the second holding portions 31a and 31b for moving the second engaging member 5 from the free position to the locked position when the second engaging member 5 is moved in the axial direction by magnetic attraction of 12, normally, the first and second electromagnets 11 and 12 are not required to be energized, power consumption can be suppressed, and if a failure occurs in either the electrical system that energizes the first electromagnet 11 or the electrical system that energizes the second electromagnet 12, the first electromagnet Even if the magnetic attraction by the electromagnet 11 or the second electromagnet 12 cannot be performed, the remaining second electromagnet 12 or the first electromagnet 11 can be used to engage the corresponding second engaging member 5 or the first Rotation can be transmitted between the first rotating body 2 and the second rotating body 3 by engaging the engaging member 4 with the engaging surface 19 and the inner peripheral surface 21 .

This rotation transmission device 1 is particularly formed with a first slit 41 axially penetrating the first rotor 9 at a position between the first electromagnet 11 and the first armature 7, A second slit 44 is formed axially through the rotor 10 at a position between the second electromagnet 12 and the second armature 8, so that when the first electromagnet 11 is excited, increasing the exchange of magnetic flux between the first rotor 9 and the first armature 7 at each of the first slits 41, increasing the force magnetically attracting the first armature 7 to the first rotor 9, When the second electromagnet 12 is energized, it increases the transfer of magnetic flux between the second rotor 10 and the second armature 8 at each second slit 44, so that the second armature 8 magnetically to the second rotor 10, the reliability of the rotation transmission device 1 can be improved.

Further, the rotation transmission device 1 particularly includes the engaging surface 19, the inner peripheral surface 21, the first and second engaging members 4, 5, the first and second rotors 9, 10, and the first and second Since the case 16 that houses the armatures 7 and 8 is made of a non-magnetic material, magnetic leakage from the first electromagnet 11 and the second electromagnet 12 to the case 16 does not occur. It is possible to prevent a decrease in the magnetic attraction force with respect to the second armature 8 and improve the reliability of the rotation transmission device 1 .

Next, a rotation transmission device according to a second embodiment as an example corresponding to the second invention will be described with reference to FIG. In addition, below, it stops at describing a difference with 1st embodiment.

A rotation transmission device according to the second embodiment has a first non-magnetic body 53 arranged between a first rotating body 51 and a first rotor 52, and a first rotating body 51 and a second rotor 54. It is different from the first embodiment in that a second non-magnetic material 55 is arranged between.

The first non-magnetic body 53 is interposed between the first rotor 52 and the first rotor 51 . The first non-magnetic body 53 shields the inner cylinder of the first rotor 52 from the first rotor 51 in the radial direction, and shields the end surface 56 of the first rotor 52 from the first rotor 51 . It consists of an annular member that shields in the axial direction. The first rotor 52, the first non-magnetic body 53 and the first rotating body 51 are spline-fitted at their fitting portions. The first non-magnetic body 53 is restricted from moving to the other side in the axial direction by a retaining ring 38 .

The second non-magnetic body 55 is interposed between the second rotor 54 and the outer race of the third bearing 15 . The second non-magnetic body 55 is an annular member that radially shields the inner periphery of the second rotor 54 from the first rotating body 51 . The second non-magnetic body 55 is fitted to the inner periphery of the second rotating body 57 and abutted against the inner peripheral shoulder portion of the second rotating body 57 in the axial direction. The third bearing 15 is fitted on the inner circumference of the second non-magnetic body 55 and abutted against the inner circumference shoulder of the second non-magnetic body 55 in the axial direction. By fitting the second rotor 57, the third bearing 15 and the second non-magnetic body 55, the second non-magnetic body 55 and the third bearing 15 are integrally positioned axially and radially. ing.

The rotation transmission device according to the second embodiment is as described above. By providing the second non-magnetic body 55 arranged between the one rotating body 51 and the second rotor 54, when the first electromagnet 11 is excited, the first rotor 52 moves from the first rotating body. 51 is suppressed by the first non-magnetic material 53, and when the second electromagnet 12 is excited, magnetic leakage from the second rotor 54 to the first rotating body 51 is prevented by the second non-magnetic material 55. , the magnetic attraction force to the first armature 7 and the second armature 8 can be prevented from decreasing, and the reliability of the rotation transmission device can be improved.

Magnetic leakage from the second rotor to the first rotor may be suppressed by interposing a second non-magnetic body between the third bearing and the first rotor.

Next, a rotation transmission device according to a third embodiment as an example corresponding to the fourth aspect of the invention will be described with reference to FIG.

The rotation transmission device according to the third embodiment differs from the first embodiment in that it includes a stopper member 62 that restricts axial movement of the second electromagnet 61 toward the second rotor 10 side.

The stopper member 62 is attached to the inner circumference of the case 63 . As the stopper member 62, for example, a retaining ring, a wave washer case, or the like can be used. The illustrated stopper member 62 is a retaining ring fitted in a circumferential groove of the case 63 . Even if the second field core 64 tries to move to the other side in the axial direction (the side of the second rotor 10) with respect to the case 63, the outer cylindrical portion of the second field core 64 is caught by the stopper member 62 in the axial direction. Axial movement of the second electromagnet 61 is blocked.

The rotation transmission device according to the third embodiment is as described above, and in particular, the stopper attached to the case 63 so as to restrict the axial movement of the second electromagnet 61 toward the second rotor 10 side. With the provision of the member 62, even if vibration or shock acts on the second electromagnet 61, the displacement of the second electromagnet 61 toward the second rotor 10 is restricted by the stopper member 62. It is possible to prevent the electromagnet 61 from slipping out to the second rotor 10 side due to vibration or the like, suppress the rattling of the second electromagnet 61 in the axial direction, and eventually the second rotor 10 and the second electromagnet. By properly maintaining the air gap between 61, the reliability of the rotation transmission device can be improved.

Next, a rotation transmission device according to a fourth embodiment as an example corresponding to the fifth invention will be described with reference to FIG.

In the rotation transmission device according to the fourth embodiment, a gasket 72 is arranged between the outer circumference of the first electromagnet 71 and the case 16, and between the first rotor 73 and the inner circumference of the first electromagnet 71. It differs from the first embodiment in that a seal 74 is arranged.

The gasket 72 liquid-tightly seals the outer circumference of the first field core 75 and the inner circumference of the case 16 . Gasket 72 may be a solid gasket or a liquid gasket. The illustrated gasket 72 is made of an O-ring and held in a circumferential groove provided on the outer circumference of the first field core 75 . A circumferential groove may be provided on the inner circumference of the case to retain the gasket, and the fitting portion of the outer circumference of the first field core to the case may be changed into a cylindrical surface.

The seal 74 liquid-tightly seals the inner circumference of the first field core 75 and the first rotor 73 . A general oil seal may be appropriately employed for the seal 74 . The diameter of the sealing surface of the first rotating body 73 that contacts the seal 74 is smaller than the diameter of the fitting surface with the first bearing 13 . As a result, it is possible to prevent the sealing surface from being scratched when the first bearing 13 is passed through the first rotating body 73, thereby preventing deterioration of the sealing performance.

The rotation transmission device according to the fourth embodiment is as described above, and in particular, the gasket 72 interposed between the outer circumference of the first electromagnet 71 and the case 16, the first rotor 73 and the first The gap between the first electromagnet 71 and the case 16 is sealed by the gasket 72, and the gap between the first rotor 73 and the first electromagnet 71 is sealed. Since it is sealed with the seal 74, it is possible to prevent malfunction due to foreign matter entering the inside of the case 16 from the side of the first rotor 73, thereby improving the reliability of the rotation transmission device.

Next, a rotation transmission device according to a fifth embodiment as an example corresponding to the sixth invention will be described with reference to FIG.

In the rotation transmission device according to the fifth embodiment, a first damping member 82 is attached to the first armature 81, and a second damping member 83 is interposed between the second armature 8 and the third bearing 15. It is different from the first embodiment in that

The first buffer member 82 is attached to the side surface of the first armature 81 on the other side in the axial direction so as to be positioned between the first rotor 9 and the first armature 81 . The first cushioning member 82 in the illustrated example comprises an annular elastic ring made of elastomer, and is fixed to a notch on the outer periphery of the first armature 81 by an appropriate means such as adhesion. When the first electromagnet 11 is de-energized, the first cushioning member 82 has a tip surface 84 positioned on the other side in the axial direction with respect to the first armature 81 . When the first electromagnet 11 is switched to an excited state and the first armature 81 is magnetically attracted to the first rotor 9, the first cushioning member 82 comes into contact with the first rotor 9 from the tip end surface 84, thereby moving the shaft. After being elastically compressed in the direction, the magnetic side surface of the first armature 81 is attracted to the first rotor 9 . In this way, the first shock absorbing member 82 absorbs the impact when the first armature 81 is attracted to the first rotor 9, so that the collision noise between the side surface of the first armature 81 and the first rotor 9 is reduced. is suppressed.

The second buffer member 83 is arranged between the side surface of the second armature 8 on one side in the axial direction, the outer ring of the third bearing 15 and the inner circumference of the second rotor 10 . The second cushioning member 83 in the illustrated example consists of a wave washer. When the second electromagnet 12 is not energized, the second buffer member 83 is in contact with the axial one side surface of the second armature 8 and the outer ring of the third bearing 15 . When the second electromagnet 12 is switched to an excited state and the second armature 8 is magnetically attracted to the second rotor 10, the second buffer member 83 is moved from the second armature 8 to the outer ring of the third bearing 15. After being elastically compressed in the axial direction, the magnetic side surface of the second armature 8 is attracted to the second rotor 10 . In this way, the second cushioning member 83 absorbs the impact when the second armature 8 is attracted to the second rotor 10, so that the collision noise between the side surface of the second armature 8 and the second rotor 10 is reduced. is suppressed.

The rotation transmission device according to the fifth embodiment is as described above. By providing the second buffer member 83 that absorbs the impact when the armature 8 is attracted to the second rotor 10 , the collision between the first armature 81 and the first rotor 9 is prevented by the first buffer member 82 . , and the collision between the second armature 8 and the second rotor 10 is alleviated by the second buffer member 83, so that the collision noise can be suppressed and the reliability of the rotation transmission device can be improved. can.

In addition, the mounting positions of the first and second cushioning members are not limited to the illustrated example, and the shafts of the corresponding first armature and second armature are attached before the corresponding first armature and second armature are sucked, respectively. It may be attached to any position as long as it is possible to compress the corresponding first and second cushioning members by directional movement and suppress the impact sound. Also, a plurality of first and second cushioning members may be arranged, and for example, compression coil springs may be held in grooves or the like at equal intervals in the circumferential direction. Also, the first and second cushioning members, springs, elastomers, and the like are not limited to those composed of a single elastic material. The rotor or the second rotor or the first armature or the second armature is fitted with a resilient material disposed between the corresponding first rotor and first armature or between the second rotor and second armature. may

A rotation transmission device with further improved reliability may be configured by combining all or a plurality of arbitrarily selected embodiments from the first to fifth embodiments described above.

FIG. 9 shows an example in which a rotation transmission device corresponding to at least one of the first to fifth embodiments is incorporated in a vehicle steer-by-wire steering system.

The illustrated steer-by-wire steering system for a vehicle includes a steering wheel 100, a steering device 102 for changing the direction of the left and right wheels 101 according to the steering angle of the steering wheel 100, and a steering device between the steering wheel 100 and the steering device 102. and a rotation transmission device 103 incorporated in the steering force transmission path.

This vehicle steer-by-wire steering system normally converts the steering angle of the steering wheel 100 by the driver into an electrical signal, and the electric actuator of the steering device 102 steers the left and right wheels 101 based on the electrical signal. It's like

This vehicle steer-by-wire steering system also includes a reaction force actuator 104 that applies a steering reaction force to the steering wheel 100 according to the behavior of the vehicle.

A first rotor 2 provided in a rotation transmission device 103 is connected to a column 106 on the steering wheel 100 side via a shaft coupling 105 . A second rotating body 3 provided in the rotation transmission device 103 is connected to a shaft 108 on the steering device 102 side via a shaft coupling 107 .

In this vehicle steer-by-wire steering system, normally, the first and second electromagnets of the rotation transmission device 103 are not energized, and the rotation transmission device 103 is maintained in a released state, so that the rotation between the steering wheel 100 and the steering device 102 is maintained. Blocks rotation transmission.

If an abnormality such as a loss of the main power supply for supplying electric power to the electric actuator of the steering device 102 occurs, the steer-by-wire steering system for a vehicle will supply power to the rotation transmission device 103 from a battery (not shown) as a backup power source. The first and second electromagnets are energized to switch the rotation transmission device 103 to the engaged state. Therefore, regardless of whether the steering wheel 100 is turned left or right, the rotation of the steering wheel 100 is input from the column 106 to the first rotating body 2 and transmitted to the second rotating body 3 via the rotation transmission device 103 . output from In this way, in the event of an abnormality, the rotation transmission device 103 transmits rotation between the steering wheel 100 and the steering device 102, so that the steering device 102 uses the rotation output from the rotation transmission device 103 to rotate the left and right wheels. The direction of the wheels 101 can be changed.

Each embodiment disclosed this time should be considered as an illustration and not restrictive in all respects. Therefore, the scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the meaning and scope of equivalents of the scope of the claims.

1, 103 rotation transmission device 2, 51, 73 first rotating body 3 second rotating body 4 first engaging member 5 second engaging member 6 elastic member 7, 81 first armature 8 second Armatures 9, 52 First rotors 10, 54 Second rotors 11, 71 First electromagnets 12, 61 Second electromagnets 16, 63 Case 19 Engagement surface 21 Inner peripheral surfaces 25a, 25b First holding portion 31a , 31b second holding portion 41 first slit 44 second slit 53 first non-magnetic material 55 second non-magnetic material 62 stopper member 72 gasket 74 seal 82 first cushioning member 83 second cushioning member

Claims (7)

A first rotating body having a plurality of engaging surfaces in a circumferential direction, a second rotating body having an inner peripheral surface surrounding the plurality of engaging surfaces, and engaging with the engaging surface and the inner peripheral surface a first engaging member and a second engaging member arranged movably between a locked position and a free position in which engagement with the engaging surface and the inner peripheral surface is impossible; and the first rotating body. a first armature and a second armature arranged axially movably relative to each other; a first rotor axially opposed to the first armature; A first electromagnet axially facing across the rotor, a second rotor axially facing the second armature, and axially facing the second armature across the second rotor. a second electromagnet for
The first armature has a first holding portion for moving the first engaging member from the free position to the locked position when axially moved by magnetic attraction of the first electromagnet; wherein the armature has a second holding portion that moves the second engaging member from the free position to the locked position when axially moved by magnetic attraction of the second electromagnet,
A first slit is formed axially through the first rotor at a position between the first electromagnet and the first armature, and the second rotor is separated from the second electromagnet and the first armature. A rotation transmission device characterized in that a second axially penetrating slit is formed at a position between the second armatures. A first rotating body having a plurality of engaging surfaces in a circumferential direction, a second rotating body having an inner peripheral surface surrounding the plurality of engaging surfaces, and engaging with the engaging surface and the inner peripheral surface a first engaging member and a second engaging member arranged movably between a locked position and a free position in which engagement with the engaging surface and the inner peripheral surface is impossible; and the first rotating body. a first armature and a second armature arranged axially movably relative to each other; a first rotor axially opposed to the first armature; A first electromagnet axially facing across the rotor, a second rotor axially facing the second armature, and axially facing the second armature across the second rotor. a second electromagnet for
The first armature has a first holding portion for moving the first engaging member from the free position to the locked position when axially moved by magnetic attraction of the first electromagnet; wherein the armature has a second holding portion that moves the second engaging member from the free position to the locked position when axially moved by magnetic attraction of the second electromagnet,
A first non-magnetic body arranged between the first rotor and the first rotor, and a second non-magnetic body arranged between the first rotor and the second rotor A rotation transmission device comprising a magnetic body. A first rotating body having a plurality of engaging surfaces in a circumferential direction, a second rotating body having an inner peripheral surface surrounding the plurality of engaging surfaces, and engaging with the engaging surface and the inner peripheral surface a first engaging member and a second engaging member arranged movably between a locked position and a free position in which engagement with the engaging surface and the inner peripheral surface is impossible; and the first rotating body. a first armature and a second armature arranged axially movably relative to each other; a first rotor axially opposed to the first armature; A first electromagnet axially facing across the rotor, a second rotor axially facing the second armature, and axially facing the second armature across the second rotor. a second electromagnet, the engaging surface, the inner peripheral surface, the first and second engaging members, the first and second rotors, and the first and second armatures. and
The first armature has a first holding portion for moving the first engaging member from the free position to the locked position when axially moved by magnetic attraction of the first electromagnet; wherein the armature has a second holding portion that moves the second engaging member from the free position to the locked position when axially moved by magnetic attraction of the second electromagnet,
A rotation transmission device, wherein the case is formed of a non-magnetic material. A first rotating body having a plurality of engaging surfaces in a circumferential direction, a second rotating body having an inner peripheral surface surrounding the plurality of engaging surfaces, and engaging with the engaging surface and the inner peripheral surface a first engaging member and a second engaging member arranged movably between a locked position and a free position in which engagement with the engaging surface and the inner peripheral surface is impossible; and the first rotating body. a first armature and a second armature arranged axially movably relative to each other; a first rotor axially opposed to the first armature; A first electromagnet axially facing across the rotor, a second rotor axially facing the second armature, and axially facing the second armature across the second rotor. a second electromagnet, the engaging surface, the inner peripheral surface, the first and second engaging members, the first and second rotors, and the first and second armatures. and
The first armature has a first holding portion for moving the first engaging member from the free position to the locked position when axially moved by magnetic attraction of the first electromagnet; wherein the armature has a second holding portion that moves the second engaging member from the free position to the locked position when axially moved by magnetic attraction of the second electromagnet,
A rotation transmission device comprising a stopper member attached to the case so as to restrict axial movement of the second electromagnet toward the second rotor. A first rotating body having a plurality of engaging surfaces in a circumferential direction, a second rotating body having an inner peripheral surface surrounding the plurality of engaging surfaces, and engaging with the engaging surface and the inner peripheral surface a first engaging member and a second engaging member arranged movably between a locked position and a free position in which engagement with the engaging surface and the inner peripheral surface is impossible; and the first rotating body. a first armature and a second armature arranged axially movably relative to each other; a first rotor axially opposed to the first armature; A first electromagnet axially facing across the rotor, a second rotor axially facing the second armature, and axially facing the second armature across the second rotor. a second electromagnet, the engaging surface, the inner peripheral surface, the first and second engaging members, the first and second rotors, and the first and second armatures. and
The first armature has a first holding portion for moving the first engaging member from the free position to the locked position when axially moved by magnetic attraction of the first electromagnet; wherein the armature has a second holding portion that moves the second engaging member from the free position to the locked position when axially moved by magnetic attraction of the second electromagnet,
A gasket interposed between the outer circumference of the first electromagnet and the case, and a seal interposed between the first rotor and the inner circumference of the first electromagnet. Rotation transmission device. A first rotating body having a plurality of engaging surfaces in a circumferential direction, a second rotating body having an inner peripheral surface surrounding the plurality of engaging surfaces, and engaging with the engaging surface and the inner peripheral surface a first engaging member and a second engaging member arranged movably between a locked position and a free position in which engagement with the engaging surface and the inner peripheral surface is impossible; and the first rotating body. a first armature and a second armature arranged axially movably relative to each other; a first rotor axially opposed to the first armature; A first electromagnet axially facing across the rotor, a second rotor axially facing the second armature, and axially facing the second armature across the second rotor. a second electromagnet for
The first armature has a first holding portion for moving the first engaging member from the free position to the locked position when axially moved by magnetic attraction of the first electromagnet; wherein the armature has a second holding portion that moves the second engaging member from the free position to the locked position when axially moved by magnetic attraction of the second electromagnet,
A first buffer member that absorbs the shock when the first armature is attracted to the first rotor, and a second shock absorber that absorbs the shock when the second armature is attracted to the second rotor. A rotation transmission device comprising: a cushioning member. 7. A steering wheel, a steering device for changing the direction of the wheels according to a steering angle of the steering wheel, and a steering force transmission path between the steering wheel and the steering device. 2. A steer-by-wire steering system for a vehicle, comprising: the rotation transmission device according to claim 1.

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