JP2001248663A - Meshing electromagnetic coupling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic coupling device excellent in coupling and uncoupling action. SOLUTION: A hold member 6 fixing an armature 8 by a torque transmitting member 7 is supported to a support member 3, also a head part 7b of the torque transmitting member 7 is provided in a through hole 4 formed in a flange part 3b of the support member 3. A first slope 7c formed in the head part 7b and a second slope 4a formed in the through hole 4 are formed so as to be opposed with a clearance provided in the direction of rotation. A meshing tooth 6d of the hold member 6 and a meshing tooth 10d of a rotor 10 are meshed, the first slope 7c of the head part 7b abuts to the second slope 4a of the support member 3, so as to generate component force energizing the hold member 6 to a side of the support member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a meshing electromagnetic coupling device.

[0002]

2. Description of the Related Art A meshing electromagnetic coupling device is configured to mesh a first meshing portion provided on one member with a second meshing portion provided on the other member by magnetic attraction of an electromagnetic coil.
An electromagnetic coupling device in which torque is transmitted from one member to the other by pressing the mating surface of the first meshing portion and the meshing surface of the second meshing portion, and a friction surface provided on one member Unlike the friction type electromagnetic coupling device that transmits torque by pressing a friction surface provided on the other member and the friction surface, a large torque can be transmitted.

[0003] Further, such a meshing type electromagnetic coupling device,
When the transmission of torque is interrupted, the first and second meshing portions that face each other in the axial direction do not come into contact with each other, and a magnetic circuit of magnetic flux generated by energizing the electromagnetic coil The air gap provided therein is designed to be wider than the air gap provided in the friction type electromagnetic coupling device. Therefore, when the spring force of the urging member for separating one member from the other member is increased so that the crimped engagement surface is quickly released, the first and second members are energized after the electromagnetic coil is energized. The connection time until the meshing portion meshes becomes longer. Also, if the connection time is shortened by weakening the spring force of the biasing member, the release time from when the energization to the electromagnetic coil is cut off until the first and second meshing portions are disengaged becomes longer. It becomes longer due to the crimping force. Therefore,
In the meshing type electromagnetic coupling device disclosed in Japanese Patent Application Laid-Open No. 5 (1999) -1990, the above-mentioned problem is solved by increasing the spring force of the urging member at the initial stage of release.

The meshing electromagnetic coupling device disclosed in Japanese Utility Model Publication No. Sho 53-11725 discloses an armature spline-fitted to an armature adapter (hereinafter, referred to as a support member) as a support member, and an electromagnetic coil in a coil receiving groove. A yoke (hereinafter, referred to as a field core) as a housed magnetic path member is provided. In addition, the armature is magnetically attracted to the field core by magnetic attraction by the magnetic flux of the electromagnetic coil, so that the engagement portion of the armature and the engagement portion of the field core mesh with each other, so that a torque is transmitted from the armature to the field core. ing. That is, the conventional meshing electromagnetic coupling device is a coil rotation type meshing electromagnetic coupling device in which a slip ring is provided on a field core.

[0005] Furthermore, the conventional meshing electromagnetic coupling device is
A first return spring provided as a biasing member provided on the support member side to separate the armature from the field core; and a push rod inserted into a spring hole of the field core and provided so as to be able to protrude and retract on the magnetic pole surface of the field core. A second return spring is provided as another urging member interposed between the set screw screwed into the opening of the spring hole, and an armature is provided at an initial release immediately after the power supply to the electromagnetic coil is stopped. Is the first,
The spring is biased in the direction away from the field core by the spring force of the second return spring.

[0006]

A conventional meshing electromagnetic coupling device has a structure in which an armature is spline-fitted to a support member. If a spline groove or a spline hole is formed, the processing cost increases and productivity is increased. bad. Further, as a structure for supporting the armature movably in the axial direction on the support member, for example, a rectangular parallelepiped projection protruding in the axial direction is provided on the support member, and the armature is provided with a notch groove into which the protrusion is fitted. It is known that lug fitting is performed by combining a rectangular parallelepiped projection with a notch groove. However, such lug fitting is performed in a state where the engagement surface of the projection and the engagement surface of the notch groove are kept pressed. And the torque transmission may not be interrupted.

Further, the conventional meshing electromagnetic coupling device requires a return spring or a spring for quickly releasing the meshing portion against the pressing force between the meshing surface of the first meshing portion and the meshing surface of the second meshing portion. The structure is such that the push rod is assembled to the field core, which requires processing of the spring hole and thread forming of the opening portion of the spring hole, resulting in poor productivity of the field core. Further, if the air gap provided between the armature and the field core is widened so that the armature separated from the field core by the first return spring does not come into contact with the push rod protruding from the magnetic pole surface of the field core, the magnetic force is increased. Since the magnetic resistance in the circuit increases, it is necessary to set the minimum attractive voltage of the electromagnetic coil high to increase the magnetic attractive force of the armature. SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem and to provide a meshing electromagnetic coupling device having good coupling and releasing operations.

[0008]

In order to achieve the above object, the meshing electromagnetic coupling device according to the first aspect of the present invention includes a supporting member whose movement in the axial direction is restricted, and A movable member capable of moving at a predetermined angle in the rotational direction and moving in the axial direction, and a first member provided on the movable member.
A magnetic path member provided with a second meshing section meshing with the first meshing section; an electromagnetic coil generating magnetic flux for magnetically attracting the movable member to the magnetic path member; An urging member for urging the member in a direction away from the magnetic path member, and a component force for urging the movable member in a direction away from the magnetic path member by a relative rotation between the support member and the movable member. And a component force generating unit for generating the force.

In the meshing electromagnetic coupling device having such a configuration, when the electromagnetic coil is energized and the movable member is magnetically attracted to the magnetic path member, the first meshing portion of the movable member and the second meshing of the magnetic path member are formed. Are engaged with each other, the engagement surfaces of these engagement portions are pressed, and torque is transmitted. In addition, due to the relative rotation between the support member and the movable member, a component force that urges the movable member in a direction away from the magnetic path member is generated in the component force generator. Moreover,
In the initial stage of release of the movable member that has interrupted the torque transmission, the movable member is quickly separated from the magnetic path member by the biasing force of the biasing member and the biasing force due to the component force.

The above-described component acts on the movable member after the first meshing portion of the movable member and the second meshing portion of the magnetic path member mesh with each other. In other words, the air gap becomes narrower and the magnetic circuit becomes smaller. After the magnetic resistance of the movable member decreases and the magnetic attraction force of the movable member increases, the biasing force due to the above-described component acts on the movable member. The second engagement portion is not disengaged from the second engagement portion. On the other hand, the meshing electromagnetic coupling device having the above-described configuration is configured such that, when an overload occurs in a supporting member or a member on the driven side of the magnetic path member, the first meshing during torque transmission due to the increased component force. It can also be used as a torque limiter that disengages the portion from the second engagement portion.

According to a second aspect of the present invention, there is provided the meshing electromagnetic coupling device according to the first aspect, wherein a first inclined surface is formed in the component force generating portion, and the supporting member or the movable member is movable. An engaging portion provided on any one of the members, and a second inclined surface facing the first inclined surface in the rotation direction are formed on the other member of the support member or the movable member. The support member and the movable member are integrally rotated when the first inclined surface and the second inclined surface come into contact with each other. .

In the meshing electromagnetic coupling device having such a configuration, a component force generating section is provided in the torque transmission path, the number of components is reduced, and the device is reduced in weight and size. In addition, a component force that urges the movable member in a direction away from the magnetic path member is generated by the rotational engagement between the first inclined surface of the engaging portion and the second inclined surface of the engaged portion. Therefore, the movable member can be quickly separated from the magnetic path member.

According to a third aspect of the present invention, there is provided the engagement type electromagnetic coupling device according to the second aspect, wherein the movable member is formed of a non-magnetic material provided with the first engagement portion. A member and an armature fixed to the holding member with a plurality of torque transmitting members are provided, and each end of the torque transmitting member protruding from the holding member to the support member side,
It is characterized in that it is an engaging part of the component generating part.

In the meshing type electromagnetic coupling device having such a configuration, since the magnetic flux of the electromagnetic coil does not flow through the holding member provided with the first meshing portion, wear of the meshing portion is small and smooth engagement of the meshing portion is achieved. Become. That is, the meshing electromagnetic coupling device is
The magnetic flux of the electromagnetic coil flows from the peak of one meshing tooth to the peak of the other meshing tooth, and the mesh of the meshing teeth slides until the meshing connection of the meshing portion is completed, but since the holding member is provided with a non-magnetic material, In addition, the above phenomenon is reduced, and the wear of the meshing teeth is reduced, and the first meshing portion and the second meshing portion are smoothly meshed. In addition, since the engaging portion is provided on the torque transmitting member for fixing the armature to the holding member, the component force generating portion can be configured with a simple structure.

According to a fourth aspect of the present invention, there is provided a meshing electromagnetic coupling device according to the third aspect, wherein the holding member is slidably fitted to a boss portion of the supporting member. A compression coil made of a non-magnetic material inserted between the inner peripheral surface of the armature fixed to the holding member and the outer peripheral surface of the boss portion of the support member and interposed between the holding member and the magnetic path member A spring is provided.

In the meshing electromagnetic coupling device having such a configuration, both ends of the compression coil spring are rubbed in the rotating direction. Although rust is generated in the part, the problem of rust can be solved by using a compression coil spring made of a non-magnetic material, for example, a stainless steel wire (SUS) compression coil spring.

[0017]

FIG. 1 is a sectional view of a meshing electromagnetic coupling device shown as an embodiment of the present invention. FIG.
FIG. 2 is an enlarged cross-sectional view of only a main part of FIG. 1. FIG. 3 is an explanatory diagram for explaining the component force generating unit. In the illustrated meshing electromagnetic coupling device, the gear 2 mounted on the tip of the rotating shaft 1 meshes with a driving gear (not shown),
A gear 1 mounted on a boss 10a of a rotor 10 described below.
9 meshes with a driven gear (not shown). A field core 11 described later is connected to a fixing member (not shown).
That is, the electromagnetic coupling device described in the embodiment is a coil stationary type meshing electromagnetic coupling device.

A spline groove 1a is formed in the rotating shaft 1 on which the gear 2 is mounted. A spline hole formed in the boss 3a of the support member 3 is fitted in the spline groove 1a. The support member 3 is formed with a disk-shaped flange portion 3b extending radially outward from an end of the boss portion 3a. In the flange 3b of the support member 3, a through hole 4 formed of a conical peripheral wall is formed at a position dividing the circumferential direction into three equal parts. The peripheral wall of the through hole 4 provided as the engaged part of the component force generating part is a peripheral wall whose diameter is increased so as to be separated from a movable member 5 described later,
In the embodiment, it is formed on the second inclined surface 4a having an angle of 40 degrees.

A movable member 5 is supported by the boss 3a of the support member 3 so as to be integrally rotatable. Movable member 5
Is provided with a holding member 6 made of a non-magnetic material, and an armature 8 fixed to the holding member 6 with a torque transmitting member 7. The holding member 6 has a cylindrical boss 3a.
Disk portion 6a slidably fitted to the disk portion, and this disk portion 6a
A cylindrical portion 6b extending from the outer peripheral surface to the magnetic path member 9 described later is integrally formed. Further, in the disk portion 6 a of the holding member 6, three through holes 6 c formed concentrically with the through holes 4 formed in the support member 3 are provided. Further, a plurality of trapezoidal teeth 6d provided as a first meshing portion are formed at the tip of the cylindrical portion 6b of the holding member 6. The outer peripheral surface of the armature 8 is fitted inside the cylindrical portion 6b of the holding member 6.

The armature 8 is formed on an inner peripheral surface larger than the inner peripheral surface of the holding member 6. In addition, the circumferential direction is 3
The support member 3 is provided in the screw hole 8a formed at the equally divided position.
The screw portion 7a of the torque transmitting member 7 which is inserted from the through hole 4 and penetrates the through hole 6c of the holding member 6 is screwed.
Further, the plate thickness of the armature 8 is such that one side surface is in contact with the side surface of the disk portion 6 a of the holding member 6, and the other side surface (friction surface) is formed by a trapezoidal tooth 6 d of the holding member 6. The plate has a thickness protruding toward the road member 9.

The torque transmitting member 7 is provided with a screw portion 7a screwed into a screw hole 8a of the armature 8, and a head 7b having a larger diameter than the screw portion 7a. The head 7 b of the torque transmitting member 7 provided as an engaging portion of the component force generating portion is provided in the through hole 4 of the support member 3. Also, head 7
The screw portion 7a side of b is formed in a conical shape. A first inclined surface 7c is provided on the head 7b of the torque transmitting member 7 so as to face the second inclined surface 4a of the through hole 4 provided as the engaged portion with a predetermined gap in the rotation direction. Have been. Note that the first inclined surface 7c in this embodiment is formed at the same angle of 40 degrees as the second inclined surface 4a.

A magnetic path member 9 is formed on the friction surface side of the armature 8 with a friction surface axially opposed to the friction surface with a predetermined air gap (a gap of about 0.7 mm to 0.8 mm). Is provided. In the coil stationary type meshing electromagnetic coupling device shown as this embodiment, the magnetic path member 9 is formed by the rotor 10 and the field core 11.
Is configured.

The rotor 10 has a pair of bearings 12
Cylindrical boss 10a rotatably mounted via the
A disk-shaped disk portion 10b extending radially outward from an end of the boss portion 10a;
The cylindrical portion 1 protruding from the side surface (the side surface radially outward from the friction surface) of the outer peripheral surface of the holding member 6 toward the cylindrical portion 6b of the holding member 6
0c and a holding member 6 formed at the tip of the cylindrical portion 10c.
Are provided with a plurality of trapezoidal teeth 10d as second meshing portions, which mesh with the trapezoidal teeth 6d. The rotor 10 having such a shape is attached to the rotating shaft 1 such that the side surface of the disk portion 10b faces the end surface of the boss portion 3a of the support member 3 retained by the retaining ring 13 via the thrust bearing 14a. The boss 10a is rotatably mounted, and the boss 10a is prevented from coming off by a snap ring 15 via a thrust bearing 14b. Reference numeral 10e denotes an arc-shaped long hole formed in the disk portion 10b, and is a magnetically disconnected portion provided to divert a magnetic flux of an electromagnetic coil 17 described later to the armature 8 side.

The field core 11 of the magnetic path member 5 is fitted to the boss 10a of the rotor 10 via a flanged cylindrical bearing 21 so that the mounting flange 11a is connected to a fixing member (not shown). Has become. The field core 11 is formed with an annular coil receiving groove 11b opened on the disk portion 10b side of the rotor 10, and accommodates the electromagnetic coil 17 wound around the coil bobbin 16 in the coil receiving groove 11b. Furthermore, the coil receiving groove 11b
The tip of the outer cylindrical portion 11c serving as the outer peripheral wall of the rotor 10 extends to the outside of the disk portion 10b of the rotor 10, and the tip of the inner cylindrical portion 11d serving as the inner peripheral wall of the coil accommodating groove 11b and the tip of the rotor 10. A thrust bearing 18 is interposed between the disk portion 10b.

At the end of the boss 10a of the rotor 10 protruding from the field core 11, a gear 19 meshing with a driven gear (not shown) is mounted so as to be integrally rotatable. Further, in an annular space provided between the inner peripheral surface of the armature 8 and the outer peripheral surface of the boss portion 3a of the support member 3, compression is interposed between the holding member 6 and the disk portion 10b of the rotor 10. A compression coil spring 20 made of a non-magnetic material is inserted as a biasing member. In addition, the compression coil spring 20 shown as the embodiment is formed of a stainless steel wire (SUS).

In the meshing electromagnetic coupling device having the above-described structure, the rotating shaft 1, the support member 3, and the movable member 5 rotate by the power transmitted from the gear 2. Further, magnetic flux generated by energizing the electromagnetic coil 17 flows from the outer cylindrical portion 11c of the field core 11 to the disk portion 10b of the rotor 10, and passes from the disk portion 10b to the armature 8 of the movable member 5 through the air gap. After that, the field core 11 is removed from the boss 10a of the rotor 10.
Flows to Therefore, when the electromagnetic coil 17 is energized, the armature 8 is magnetically attracted to the disk portion 10b of the rotor 10 against the spring force of the compression coil spring 20, so that the trapezoidal teeth 6d of the holding member 6 and the trapezoidal shape of the rotor 10 The meshing torque is transmitted to the teeth 10d. And gear 2
The gear 19 also rotates by the power on the side.

The meshing of the trapezoidal teeth 6d and the trapezoidal teeth 10d allows the rotation of the rotational direction provided between the first inclined surface 7c of the torque transmitting member 7 and the second inclined surface 4a of the support member 3. Since the support member 3 connected to the drive side is relatively rotated in the rotation direction T with respect to the movable member 5 to which the load on the driven side is applied by the gap, as shown in FIG. As a result, a component force F1 in the rotational direction and a component force F2 in the direction of separating the movable member 5 from the magnetic path member 9 (axial direction) are generated.

Therefore, in a torque transmitting state in which the trapezoidal teeth 6d and the trapezoidal teeth 10d mesh with each other, the movable member 5 is urged toward the flange portion 3b of the support member 3 by the component force F2. Even after the magnetic attraction P due to the magnetic flux of the electromagnetic coil 17 has disappeared, the trapezoidal teeth 6d and the trapezoidal teeth 10d
The movable member 5 is urged toward the flange 3b side of the support member 3 by the component force F2 until the meshing of the movable member 5 is released.
Therefore, after the torque transmission is interrupted, the trapezoidal teeth 6d
Even if the meshing surface of the compression coil spring 20 and the meshing surface of the trapezoidal teeth 10d remain in a crimped state.
Is quickly released by the spring force and the component force F2, so that a good releasing operation can be obtained. In addition, since the spring load of the compression coil spring 20 provided as the urging member can be set small, a favorable coupling operation can be obtained by the magnetic attraction of the magnetic flux of the electromagnetic coil 17.

As described above, the embodiment of the present invention has been described with respect to the coil-coupling type electromagnetic coupling device. However, like the electromagnetic coupling device described in the prior art, the field core is provided with the second coupling portion. The present invention can also be applied to a coil rotation type meshing electromagnetic coupling device. Further, the trapezoidal teeth 6d and the trapezoidal teeth 10d serve as the first meshing portion and the second meshing portion.
However, the meshing teeth having other shapes may be used.

Further, in the meshing type electromagnetic coupling device according to the present invention, the first meshing portion is formed on the cylindrical portion 6b of the holding member 6, and the disk portion 1 of the rotor 10 is disengaged from the friction surface of the armature 8.
The plurality of protrusions may protrude toward the 0b side, and the second meshing portion may be a plurality of recesses formed in the disk portion 10b of the rotor 10. Then, the armature 8 is magnetically attracted to the rotor 10, so that the engagement portion can be an engagement type electromagnetic coupling device in which the protrusions mesh with the recesses. Further, a through hole 4 as an engaged portion is provided on the supporting member 3 side, and a head 7b of the torque transmitting member 7 as an engaging portion is formed on the movable member 5 side. The engaging portion can be provided on the support member 3 side.

[0031]

According to the meshing type electromagnetic coupling device of the first aspect, even if the meshing surface of the meshing portion remains crimped after the torque transmission is interrupted, the crimping state is not changed. Since the urging member is quickly released by the urging force of the urging member and the component force generated in the component force generating section, a good releasing operation can be obtained. In addition, since the urging force for urging the movable member toward the support member can be set to be small, a favorable connection operation can be obtained.

In the meshing electromagnetic coupling device according to the second aspect, since the component force generating section is configured in the torque transmission path, it is not necessary to separately configure the component force generating section and the torque transmitting member, and the number of components is reduced. Therefore, it is possible to provide a lightweight, compact, and inexpensive meshing electromagnetic coupling device.

In the meshing electromagnetic coupling device according to the third aspect, since the holding member is provided with a non-magnetic material, the meshing portion can be smoothly meshed with little wear of the meshing portion. Further, since the torque transmitting member for fixing the armature to the holding member is provided with the engaging portion, the component force generating portion can be configured with a simple structure.

In the meshing electromagnetic coupling device according to the fourth aspect, both ends of the compression coil spring are rubbed in the rotational direction.
Since a compression coil spring made of a non-magnetic material is used, there is no problem of rust, and it is possible to provide a meshing electromagnetic coupling device capable of maintaining stable operation characteristics even after long-term use.

[Brief description of the drawings]

FIG. 1 is a sectional view of a meshing electromagnetic coupling device shown as an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of FIG.

FIG. 3 is an explanatory diagram for explaining a component force generating unit.

[Explanation of symbols]

 Reference Signs List 3 support member 4 through hole as engaged portion 4a second inclined surface 5 movable member 6 holding member 7 torque transmitting member 7b head as engaging portion 7c first inclined surface 8 armature 9 magnetic path member 10 rotor 11 Field core 17 Electromagnetic coil 20 Compression coil spring

Claims (4)

[Claims] 1. A supporting member whose movement in the axial direction is restricted, a movable member capable of moving at a predetermined angle in the rotation direction and moving in the axial direction with respect to the supporting member, and a movable member provided on the movable member. 1, a magnetic path member provided with a second meshing section meshing with the first meshing section; an electromagnetic coil generating a magnetic flux for magnetically attracting the movable member to the magnetic path member; An urging member for urging the movable member in a direction away from the magnetic path member, and an urging member for urging the movable member in a direction away from the magnetic path member by a relative rotation between the support member and the movable member. A mesh type electromagnetic coupling device, comprising: a component force generating section for generating a force. 2. The engagement type electromagnetic coupling device according to claim 1, wherein the component force generating section has a first inclined surface formed thereon and provided on one of the support member and the movable member. A mating portion, a second inclined surface facing the first inclined surface in the rotation direction is formed, and an engaged portion provided on one of the support member and the movable member is configured; The mesh type electromagnetic coupling device, wherein the first inclined surface and the second inclined surface come into contact with each other, whereby the support member and the movable member rotate integrally. 3. The meshing electromagnetic coupling device according to claim 2, wherein the movable member includes a holding member made of a nonmagnetic material provided with the first meshing portion, and a plurality of torque transmitting members attached to the holding member. An engagement type electromagnetic coupling device, comprising: an armature fixed by the above (1), and each end of the torque transmitting member protruding from the holding member toward the support member, as an engaging portion of a component force generating portion. 4. The meshing electromagnetic coupling device according to claim 3, wherein: a holding member slidably fitted to a boss of the supporting member;
A compression made of a non-magnetic material inserted between the inner peripheral surface of the armature fixed to the holding member and the outer peripheral surface of the boss of the support member, and interposed between the holding member and the magnetic path member. A mesh type electromagnetic coupling device comprising a coil spring.