JP2002242957A - Electromagnetic connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a malfunction of a device and prevent the defective meshing between the connecting teeth of an armature and the connecting teeth of a hub. SOLUTION: A support section 37 is protruded at the lower end of a rotor 3 rotated integrally with a drive shaft 2, and a projection 35 is protruded on a flange section 33. A coupling hole 51 is provided at the center of the armature 5, and a through hole 52 to be inserted with the projection 35 is provided at an outer peripheral end section. The coupling hole 51 of the armature 5 is coupled with the support section 37 of the rotor 3 via a ring-like member 4 formed with a resin. The hub 6 is supported on a driven side rotating member to face the armature 5 so that their connecting teeth are meshed with each other. When an electromagnetic coil 8 is excited, the armature 5 is moved in the B direction to separate from the hub 6 against the elastic force of a compression coil spring 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mesh type electromagnetic coupling device in which respective coupling teeth formed on a disk surface on a driving side and a coupling side formed on a disk surface on a driven side are engaged with each other or released from engagement.

[0002]

2. Description of the Related Art An electromagnetic coupling device of this type is disclosed in Japanese Utility Model Laid-Open No. 49-49345. This publication discloses an armature having connecting teeth and spline-fitted to a rotor, a hub having connecting teeth that mesh with the connecting teeth of the armature, and a bias in a direction in which these connecting teeth mesh with each other. And an electromagnetic coil for attracting the armature in a direction to release the engagement of the connecting teeth against the urging means when energized.

Further, as another connection structure between the rotor and the armature, a guide pin is implanted in the rotor and a through hole is provided in the armature to fit the guide pin, or the rotor and the armature are connected via a leaf spring. Was linked.

[0004]

Of the above-mentioned conventional electromagnetic coupling devices, those connected by spline coupling had to be processed with spline grooves. In addition, in the case where the guide pin is planted, it is necessary to machine a bottomed hole for planting the guide pin, and in the case where the guide pin is connected via a leaf spring, a leaf spring must be attached. However, it is difficult to reduce the cost of the product. In order to solve this problem, there has been proposed an apparatus in which the projection is integrally formed on the flange portion of the rotor by sintering without using the guide pin as a separate member, thereby reducing the cost of the product. However, with this structure, the sliding frictional force between the protrusion and the through-hole increases due to the variation in the processing size of the protrusion of the rotor and the through-hole of the armature in which the protrusion is fitted, and the armature smoothly moves. There is a possibility that the movement will not be performed, and an operation failure will occur in which the engagement time between the connection teeth of the armature and the connection teeth of the hub and the release time of the engagement will take extra time. Therefore, there is a limit in reducing the tolerance of fitting between the protrusion of the rotor and the through-hole of the armature, and so-called centering of the armature in which the armature is arranged concentrically with respect to the rotor cannot be sufficiently performed. For this reason, the armature cannot be arranged concentrically with respect to the rotor, and there has been a problem that poor engagement between the connecting teeth of the armature and the connecting teeth of the hub occurs.

The present invention has been made in view of the above-mentioned conventional problems, and a first object of the present invention is to prevent a malfunction of the apparatus. A second object is to prevent poor engagement between the connecting teeth of the armature and the connecting teeth of the hub.

[0006]

In order to achieve this object, the invention according to claim 1 comprises: a rotor whose rotation is controlled;
An armature that rotates integrally with the rotor via an engagement means and is provided with connecting teeth; a hub provided concentrically with the armature and provided with connecting teeth meshing with the connecting teeth of the armature; Urging means for urging the armature in a direction in which the connecting teeth of the and the hub mesh with each other, and an electromagnetic coil for moving the armature in the axial direction of the rotor against the urging force of the urging means. In the electromagnetic coupling device provided, a support portion that is concentric with the rotor is protruded at one end of the rotor, and a fitting hole that fits into the support portion is provided in the armature,
A sliding member having a small coefficient of friction is interposed between the support portion and the fitting hole. Therefore, the armature is supported by the supporting portion of the rotor via the sliding member.

According to a second aspect of the present invention, in the first aspect, the sliding member is a ring-shaped member formed of resin. Therefore, the expansion of the rotor is absorbed by the elastic deformation of the resin. Further, the magnetic flux generated between the electromagnetic coil and the armature is cut off by the ring-shaped member formed of a non-magnetic material, and the magnetic path between the armature and the rotor support is cut off.

According to a third aspect of the present invention, in the first aspect of the present invention, a sliding layer is formed on one of an outer peripheral surface of the support portion and an inner peripheral surface of the fitting hole. . Therefore, there is no need to attach a sliding member.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an electromagnetic coupling device according to the present invention, and FIG. 2 shows the same rotor, and FIG. 1 (a) is a cross-sectional view taken along the line II (a) -II (a) in FIG. b) is a bottom view. FIG. 3 shows a ring-shaped member, and FIG. 3 (a) is a view similar to III (a) -III in FIG. 3 (b).
(A) is a line sectional view, and (b) is a plan view. 4A and 4B show the armature, FIG. 4A is a sectional view taken along the line IV (a) -IV (a) in FIG. 4B, FIG. 4B is a bottom view, and FIG. It is an enlarged view of IV (c) part in (a). 5A and 5B show a hub, and FIG. 5A is a sectional view taken along line V (a) -V (a) in FIG.
2 is a bottom view, and FIG. 2C is an enlarged view of a portion V (c) in FIG.

In FIG. 1, reference numeral 1 denotes an electromagnetic clutch as an electromagnetic coupling device according to the present invention. The rotor 3 rotates integrally with a drive shaft 2 and the rotor 3 integrally rotates with the drive shaft 2. An armature 5 that rotates in the axial direction of the drive shaft 2, that is, is movable in the directions of arrows AB,
A compression coil spring 7 for urging the armature 5 toward the hub 6 and an electromagnetic coil 8 for attracting the armature 5 in the direction of arrow B against the elastic force of the compression coil spring 7 are schematically constituted.

As shown in FIG. 2, the rotor 3 is formed in a cylindrical shape, and is provided with a shaft hole 31. The hole wall of the shaft hole 31 extends in the axial direction and has a rectangular cross section. Done 1
Key grooves 32 are provided, and the drive shaft 2
The rotor 3 rotates integrally with the drive shaft 2 by fitting the key (not shown). A flange 33 projecting horizontally outward is integrally formed below the outer peripheral portion of the rotor 3 by sintering. At the outer peripheral end of the flange portion 33, three long holes 34 for magnetic flux detour which are curved in the circumferential direction are formed, and a small shaft having a diameter d1 is provided between the long holes 34. Three projections 35 as engagement means formed in the shape of a circle protrude downward, and three bottomed holes 36 are recessed inward of the long hole 34 in the radial direction. Further, at the lower end of the rotor 3, a cylindrical support portion 37, which is a feature of the present invention, is provided so as to protrude downward.

In FIG. 1, reference numeral 4 denotes a ring-shaped member as a sliding member which is a feature of the present invention. The ring-shaped member is formed entirely of a non-magnetic material having a small coefficient of friction, and is made of resin. The portion 37 is formed at substantially the same height as the height of the portion 37, and a fitting hole 41 is provided at the center as shown in FIG. As shown in FIG. 1, the ring-shaped member 4 is fixed to the support portion 37 by fitting the fitting hole 41 to the outer peripheral portion of the support portion 37 of the rotor 3 described above.

In FIG. 4, the armature 5 is formed in a disk shape having a flat outer diameter D1 and a fitting hole 51 in the center.
Are provided, and three through holes 52 are formed in the outer peripheral portion as engagement means having a diameter of d2. The diameter d2 of the through hole 52 and the diameter d of the protrusion 35 of the rotor 3 described above.
The fit tolerance with 1 is set relatively large. A ring-shaped convex strip 5 is provided on the outer peripheral end face of the armature 5.
3 protrudes in the thickness direction of the armature 5, and FIG.
As shown in (1), connecting teeth 54 are formed on the end face of the ridge 53. As shown in FIG. 1, the armature 5 is configured such that the protrusion 35 of the rotor 3 is engaged with the through hole 52 and the fitting hole 51 is fitted to the ring-shaped member 4 so that the armature 5 It is slidably supported in the axial direction (the direction of the arrow AB).

In FIG. 5, the hub 6 is formed in a substantially disk shape with the same outer diameter as the outer diameter D1 of the armature 5, and is provided with a convex fitting portion 61 having a through hole 61a at the center. Four screw holes 62 are screwed around the fitting portion 61. On the outer peripheral end surface of the hub 6, a ring-shaped ridge 63 is provided so as to protrude in the thickness direction of the hub 6, and as shown in FIG. Connecting teeth 64 meshing with connecting teeth 54 of No. 5
Are formed. The hub 6 is supported by the driven-side rotating member such that the connecting teeth 64 face the connecting teeth 54 of the armature 5. That is, the hub 6 fits the convex fitting portion 61 into the concave fitting portion of the driven-side rotating member, and screws the screw inserted from the insertion hole of the driven-side rotating member into the screw hole 62. Thereby, it is fixed to the driven side rotating member.

As shown in FIG. 1, between the three bottomed holes 36 of the rotor 3 and the surface of the armature 5, a compression coil spring 7 is mounted. The armature 5 is urged in the direction of arrow A by the force,
The connection teeth 54 of the armature 5 and the connection teeth 64 of the hub 6 always mesh.

The yoke 81 accommodating the electromagnetic coil 8 is fixed to a bracket or the like of a driving-side rotating member (not shown). Since the magnetic path 9 shown is formed, the armature 5 moves in the direction of arrow B against the elastic force of the compression coil spring 7, and the engagement between the connection teeth 54 of the armature 5 and the connection teeth 64 of the hub 6 is released. Is done. At this time, since the ring-shaped member 4 made of a non-magnetic material is interposed between the armature 5 and the support portion 37 of the rotor 3, the support portion 3 of the armature 5 and the rotor 3 is provided.
Since the formation of a magnetic path between the armature 5 and the armature 5 is restricted, the generation of leakage magnetic flux can be prevented, and the decrease in the attractive force of the electromagnetic coil 8 on the armature 5 can be prevented.

Further, since the armature 5 is fitted to the support portion 37 of the rotor 3 via the ring-shaped member 4, the armature 5 is supported concentrically with the rotor 3, so-called centering of the armature 5 is performed. Is performed. Therefore, as compared with the case where the armature 5 is centered through the fitting between the protrusion 35 of the rotor 3 and the through hole 52 of the armature 5 as in the related art, the connection teeth 54 of the armature 5 Since the connecting teeth 64 are opposed to the connecting teeth 64 without causing displacement, it is possible to prevent a poor meshing between the connecting teeth 54 of the armature 5 and the connecting teeth 64 of the hub 6.

Further, since the fitting tolerance between the projection 35 of the rotor 3 and the through hole 52 of the armature 5 can be set to be large, when the armature 5 moves in the direction of the arrow AB, the distance between the projection 35 and the through hole 52 is increased. No large sliding friction force is generated. Further, since the ring-shaped member 4 made of resin having a low friction coefficient is interposed between the support portion 37 of the rotor 3 and the fitting hole 51 of the armature 5, the armature 5 moves in the direction of arrow B. When doing
Since a large sliding load is not applied to the armature 5, the armature 5 moves smoothly. Therefore, the operation time can be prevented without increasing the engagement time and the engagement release time of the connecting teeth 54 and 64 of the armature 5 and the hub 6 with each other.

In such a configuration, when the electromagnetic coil 8 is not energized, the armature 5 is urged in the direction of arrow A by the resilient force of the compression coil spring 7, so that the connecting teeth 54 of the armature 5 Are engaged with the connecting teeth 64 of the hub 6. Therefore, when the drive shaft 2 is driven to rotate, the rotor 3 rotates integrally, and the armature 5 also rotates through the engagement between the protrusion 35 of the rotor 3 and the through hole 52 of the armature 5. The rotation of the armature 5 is transmitted to the hub 6 via the engagement between the connection teeth 54 of the armature 5 and the connection teeth 64 of the hub 6, so that the hub 6 rotates.

On the other hand, when the electromagnetic coil 8 is energized, the armature 5 moves in the direction indicated by the arrow B against the elastic force of the compression coil spring 7.
Moving in the direction, the connecting teeth 5 of the armature 5
Since the engagement between the connection teeth 4 and the connecting teeth 64 of the hub 6 is released, the rotation of the drive shaft 2 is not transmitted to the hub 6.

In the above description, the protrusion 35 and the through-hole 52 serve as engagement means between the rotor 3 and the armature 5.
However, in the electromagnetic coupling device of the present invention, the protrusion 35 may be a guide pin implanted in the bottomed hole of the rotor 3.

The ring-shaped member 4 made of resin is interposed between the support portion 37 of the rotor 3 and the fitting hole 51 of the armature 5. A sliding layer may be provided by coating one of the inner peripheral surfaces with a resin. In that case,
Since the ring-shaped member 4 becomes unnecessary, the number of parts and the number of assembling steps can be reduced, and the manufacturing cost can be reduced. Further, the present invention is applied to the electromagnetic clutch, but can also be applied to an electromagnetic brake having one of the rotor 3 and the hub 6 as a fixed member.

[0023]

As described above, according to the first aspect of the present invention, the movement of the armature is performed smoothly, so that a malfunction can be prevented. Further, since the rotor and the armature are arranged concentrically, it is possible to prevent poor engagement between the connecting teeth of the armature and the hub.

According to the second aspect of the present invention, since the rotor and the armature are arranged concentrically, it is possible to prevent poor engagement between the connecting teeth of the armature and the hub. In addition, the magnetic flux between the support portion of the rotor and the armature is magnetically cut off by the resin, which is a non-magnetic material, so that the leakage magnetic flux is reduced, so that a decrease in the attractive force by the electromagnetic coil can be prevented.

According to the third aspect of the invention, the number of parts and the number of assembling steps can be reduced, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an electromagnetic coupling device according to the present invention.

FIG. 2 shows a rotor of the electromagnetic coupling device according to the present invention,
FIG. 2A is a sectional view taken along the line II (a) -II (a) in FIG. 1B, and FIG. 1B is a bottom view.

FIG. 3 shows a ring-shaped member of the electromagnetic coupling device according to the present invention, and FIG. 3 (a) is a view showing III (a) -III in FIG. 3 (b).
(A) is a line sectional view, and (b) is a plan view.

FIG. 4 shows an armature of the electromagnetic coupling device according to the present invention, wherein FIG. 4 (a) is an IV (a) -IV in FIG. 4 (b).
(A) is a sectional view taken along a line, (b) is a bottom view, and (c) is an enlarged view of a portion IV (c) in FIG.

5 shows a hub of the electromagnetic coupling device according to the present invention, wherein FIG. 5 (a) is a sectional view taken along line V (a) -V (a) in FIG. 5 (b), FIG. 5 (b) is a bottom view, FIG. 3C is an enlarged view of a portion V (c) in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic clutch, 2 ... Drive shaft, 3 ... Rotor, 4 ... Ring-shaped member, 5 ... Armature, 6 ... Hub, 7 ... Compression coil spring, 8 ... Electromagnetic coil, 9 ... Magnetic path, 35 ... Projection, 37
... Support part, 51 ... Fit hole, 52 ... Through hole, 54,64 ...
Connecting teeth.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyasu Kouchi 2-678, Aioi-cho, Kiryu-shi, Gunma F-term (reference) in Ogura Clutch Co., Ltd. 5E048 AA08 AB06 AC06 AD04 AD21

Claims (3)

[Claims] 1. An armature, which is integrally rotated with a rotor whose rotation is controlled through an engagement means and provided with connecting teeth, and is provided concentrically with the armature and meshes with the connecting teeth of the armature. A hub provided with connecting teeth to be provided, urging means for urging the armature in a direction in which the armature and the connecting teeth of the hub mesh with each other, and the armature against the urging force of the urging means. An electromagnetic coupling device comprising: an electromagnetic coil that moves in the axial direction of the rotor; a rotor having a concentric support portion protruding at one end of the rotor, and a fitting hole that fits into the support portion on the armature. An electromagnetic coupling device, wherein a sliding member having a small coefficient of friction is interposed between the support portion and the fitting hole. 2. The electromagnetic coupling device according to claim 1, wherein
An electromagnetic coupling device, wherein the sliding member is a ring-shaped member formed of resin. 3. The electromagnetic coupling device according to claim 1, wherein
An electromagnetic coupling device, wherein a sliding layer is formed on one of an outer peripheral surface of the support portion and an inner peripheral surface of the fitting hole.