JP3296916B2 - Electromagnetic spring clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic spring clutch interposed between a rotary input shaft and a rotary output shaft for controlling transmission and release of rotation of an input shaft to an output shaft.

[0002]

2. Description of the Related Art Conventionally, there has been known an electromagnetic spring clutch as shown in FIG.
As shown in this figure, the electromagnetic spring clutch comprises a cylindrical casing 10, an input gear 410 for inputting rotational driving from outside the system into the electromagnetic spring clutch, and the casing 10
It has a basic configuration including a clutch mechanism utilizing the magnetic force of an unillustrated electromagnetic coil housed therein, and an output take-out shaft X output via the clutch mechanism.

The output take-out shaft X has a large-diameter head 530.
An output cylinder 510 having a horizontally long and small diameter, which is rotatably fitted around the axis, is fitted to the output cylinder 5.
10. A coil spring 310 is fitted over the outer peripheral surface of the head 530 and the outer peripheral surface of the pressing cylinder 450, and one end of the coil spring 310 is also connected to the input gear 410, and the other end is provided with a clutch mechanism. It is connected to one clutch plate. Further, the other clutch plate rotates together with the head 530.

When the electromagnetic coil (not shown) is not excited (demagnetized state), the clutch plates are separated from each other, and the rotation of the input gear 410 is not transmitted to the output output shaft X. When energized, the clutch mechanism operates to connect the two clutch plates, and the input gear 410
Is transmitted to the output take-out shaft X via the coil spring 310 and the clutch plate.

When the clutch plate is joined, the diameter of the coil spring 310 co-rotating with the input gear 410 is reduced.
The outer peripheral surface of the head 530 of the output cylinder 510 and the outer peripheral surface of the pressing cylinder 450 are simultaneously tightened by the reduction of the diameter of the output cylinder 510, so that the rotation of the input gear 410 can more reliably rotate the output take-out axis X.
Is transmitted to the rotation.

[0006]

By the way, in the conventional electromagnetic spring clutch as described above, the output cylinder 510 having the head 530 has a relatively complicated shape, and is manufactured by metal cutting. Because of its difficulty, it has been manufactured by loading a ceramic or metal powder into a mold, molding and then performing a sintering process. By applying such a manufacturing method, the output cylinder 510 can be manufactured with considerable accuracy even if the shape is complicated.

[0007] Conventional sintered products are manufactured with the head 530 integrally attached to the output shaft 510. Thus, they become of considerable long in the axial direction, it must be provided fitting hole for fitting the power takeout City axis X in the longitudinal direction of such a long. Since such an insertion hole is required to be formed with extremely high precision, even if it is a sintered product molded using a mold, it is necessary to form the hole after sintering by cutting. General. However, a long output cylinder 51 having a head 530
It is very difficult to cut the insertion hole in the axial direction to zero. Even more, an output tube 510, and an output extraction City axis X in order to rotate together, if trying to form a flat portion over the longitudinal direction on a part of the inner peripheral surface of the insertion hole, the cutting is extremely difficult There is a problem that becomes.

Further, since such a sintered product has a large coefficient of friction between itself and a metal, the pressing cylinder 4
There is a problem that the output take-out shaft X cannot rotate smoothly due to sliding resistance due to frictional force between the inner peripheral surface of the output cylinder 50 and the outer peripheral surface of the output cylinder 510.

Further, since the wear strength of the above sintered product is higher than that of metal, for example, when the pressing cylinder 450 is made of metal, the outer peripheral surface of the output cylinder 510 works as a file, and the inner circumference of the pressing cylinder 450 If a sintered product is applied to the pressing cylinder 450 as well as the surface is damaged, there is a disadvantage that both the pressing cylinder 450 and the output cylinder 510 are easily damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The input rotation can be smoothly taken out as the output rotation, and the output shaft can be easily manufactured. It is an object of the present invention to provide an electromagnetic spring clutch in which damage due to wear of an output shaft is effectively suppressed.

[0011]

Electromagnetic spring clutch according to claim 1 of the present invention In order to achieve the above object, according to the cylindrical casing, an electromagnetic coil having an axial through hole, engaged with the one end of the co Irubane, shaft a contact magnetizing member that having a through hole in a direction, has an axial through hole, is connected to around co casing outside of the input gear and the other end of the coil spring in the through hole of the electromagnetic coil A pressing cylinder fitted in a locked state, and a rotary output member fitted in the respective through-holes and also having an axial through-hole are provided therein, and the magnetizing member has a radial direction. amateur projecting annularly provided, in the rotary output member is provided ring-shaped rotor protrudes radially and thus the rotor excitation magnetic of the electromagnetic coil and the armature is magnetically attracted joined to rotary output member of the input gear by With Tenden us is carried out, the above-mentioned power
The armature is separated from the rotor by the demagnetization of the magnetic coil.
The rotation of the input gear to the rotation output member
The electromagnetic spring clutch that is configured to be cut off, the rotary output member, a crown設体the upper SL rotor is fixed, is rotated together coupled concentrically this crown設体output
An output shaft having a shaft hole into which the take-out shaft is inserted . The crowned body is provided with an arc-shaped hole as the through hole having a flat portion for locking on an inner peripheral surface thereof. A locking arc portion corresponding to the arc hole is formed at one end, and the capping body and the output shaft are coupled so as to be able to rotate together by fitting the locking arc portion into the arc hole. It is characterized by the following.

The electromagnetic spring clutch according to a second aspect of the present invention is the electromagnetic spring clutch according to the first aspect, wherein the arc hole is formed from the opening to a point in the axial direction of the crowned body.
A concentric circular hole into which the output shaft is fitted is formed in the crown body following the circular arc hole.

According to a third aspect of the present invention, there is provided the electromagnetic spring clutch according to the first or second aspect, wherein the crown member is formed of a sintered material, and the output shaft is formed of a sintered material. It is characterized by being formed of a material having a smaller friction coefficient.

According to a fourth aspect of the present invention, there is provided the electromagnetic spring clutch according to the third aspect, wherein the output shaft is made of metal.

[0015]

According to the electromagnetic spring clutch of the first aspect, when the electromagnetic coil is demagnetized, the rotational drive transmitted from outside the system to the input gear rotates the pressing cylinder that rotates together with the input gear. Is transmitted to the armature of the coil spring locked by the coil spring and the magnetizing member locked by the coil spring, but since the magnetic field lines are not generated from the electromagnetic coil, the armature is separated from the rotor by a so-called clutch. The input gear rotates as a result.
Not transmitted in time non-inverted output member.

[0016] In a state where the electromagnetic coil is energized, it adsorbed joined together and armature and the rotor by the generation of magnetic field lines, to become a state in which a so-called clutch is placed, transmitted to the rotary driving times inverted output member of the input gear Will be done. If the rotation direction of the input gear is the same as the winding direction of the coil spring, the rotation of the input gear causes the coil spring locked by the pressing cylinder and the member for magnetism to be twisted and reduced in diameter. The rotation of the input gear is reliably transmitted to the rotation output member by this connection because the rotation output member and the pressing cylinder fitted to the cylinder are fastened simultaneously.

Further, the crown body is provided with an arc hole having a flat portion for locking on the inner peripheral surface, and a locking arc portion corresponding to the arc hole is formed at one end of the output shaft. Because
By fitting the locking arc portion of the output shaft into the arc hole of the crowned body, the flat portion of the crowned body and the flat portion of the locking arc portion are stopped, and the output shaft and the crowned body can be easily connected. It becomes possible to join together so that it can rotate together.

Further, since the crowned body and the output shaft concentrically and corotatably connected to the crowned body are formed separately from each other, the manufacture becomes easier as compared with the case where they are integrally formed from the beginning.

According to the electromagnetic spring clutch of the second aspect, the accuracy of the coaxiality between the crowned body and the output take-out shaft fitted into the crowned body is improved due to the presence of the circular hole, and the two rotate together. No swing occurs on the top.

According to the electromagnetic spring clutch of the third aspect, the crown member is formed of a sintered material, and the output shaft is formed of a material having a smaller coefficient of friction than the sintered material. Therefore, friction loss due to rotation of the output shaft, which is performed while the outer peripheral surface of the output shaft slides on the inner peripheral surface of the pressing cylinder, is reduced, and smooth rotation of the output shaft is realized, and the pressing cylinder and the output shaft are damaged. Is suppressed.

According to the electromagnetic spring clutch of the fourth aspect, since the output shaft is made of metal, the coefficient of friction is smaller than that of a conventional sintered material.

[0022]

FIG. 1 is an exploded perspective view showing an example of an electromagnetic spring clutch according to the present invention, and FIG. 2 is a side sectional view of a state where the electromagnetic spring clutch shown in FIG. 1 is assembled. The side view is drawn below the center line extending in the horizontal direction indicated by the dashed line. As shown in these drawings, the electromagnetic spring clutch comprises a casing 1 as an exterior member, an electromagnetic coil 2 which has an axial mounting bore 210 disposed in the casing 1, it is furnished to the casing 1, the upper Symbol The magnetizing member 3 for turning on and off the clutch by excitation and demagnetization of the electromagnetic coil 2, the rotation input member 4 for inputting rotation via the input gear 41, and the output shaft 51 for outputting input rotation. The rotation output member 5 provided and the electromagnetic coil 2
Fitted in the mounting hole 210, for rotating the input gear 41 for magnetizing
It has a basic configuration consisting of a coil spring 6 for transmitting to the member 3 .

The casing 1 has a cylindrical casing 1.
1, a sleeve 14 attached to one opening of the cylindrical case 11, and a back cover 17 for closing the other opening. As shown in FIG. 2, a side wall 11a is formed in one opening of the cylindrical case 11.
The sleeve 14 is fitted in a hole at the center of the sleeve. That is, a large-diameter portion having a large outer diameter and a small-diameter portion having a smaller outer diameter are formed on the outer peripheral surface of the sleeve 14,
The sleeve 14 is fixed to the cylindrical case 11 in a state where the small diameter portion is fitted into the opening of the side wall 11a from the inside of the cylindrical case 11.

On the other hand, a plurality of arc-shaped projections 13 are provided at equal intervals on the other side edge of the cylindrical case 11, and a locking groove 13a is formed between the adjacent arc-shaped projections 13.
An arc-shaped projection 18 corresponding to the locking groove 13a is provided on a peripheral edge of the back cover 17, and a locking groove 18a is formed between the adjacent arc-shaped projections 18. And
By alternately fitting the respective arc-shaped projections 13 and 18 into the respective locking grooves 13a and 18a, the cylindrical case 1 is formed.
The opening on the back side (left side in the drawing) of 1 is in a closed state.

The sleeve 14 has a pressing cylinder 45 described later.
The first bush 46 has an insertion hole 140 having an inner diameter into which the first bush 46 can be rotatably fitted.
It plays the role of a bearing that rotatably supports the pressing cylinder 45 inserted through 40. Further, a locking window 170 having a pair of parallel flat inner surfaces 17a is provided on the inner surface of the back cover 17 that penetrates the center portion thereof and opposes each other. The bearing plate 15 is fitted.

The bearing plate 15 is used for rotating output members 5 to be described later.
Is a member for rotatably supporting the crowned body 53 of the first embodiment, and the engaging projection 16 corresponding to the flat locking window 170 at the center of the rear surface.
Are provided, and an insertion hole 150 for rotatably fitting the crowned body 53 is provided at the center. The flat inner surface 17a is provided on the outer peripheral surface of the engagement convex portion 16.
Are formed, and the bearing plate 15 and the back cover 17 are prevented from rotating relative to each other around the axis in a state where the engaging projections 16 are fitted into the locking windows 170. It has become.

The electromagnetic coil 2 comprises a bobbin 21 having a pair of annular walls 23 protruding radially annularly at both ends.
And a coil wire 22 wound around the outer peripheral surface of the bobbin 21.
It is composed of The outer diameter of the annular wall 23 is set to be substantially equal to the inner diameter of the cylindrical case 11, and the electromagnetic coil 2 is fixed in the cylindrical case 11 by press-fitting the electromagnetic coil 2 into the cylindrical case 11. It has become so. With the electromagnetic coil 2 installed inside the cylindrical case 11, an annular concave portion 23 a formed at the center of the annular wall 23 on the front side (right side in the drawing) is attached to the center of the side wall 11 a of the cylindrical case 11. The sleeve 14 fits into the sleeve 14. In this state, the lead wire 24 of the electromagnetic coil 2 led out from the bobbin 21 on the front side is
The tube case 11 is led out through a cord hole 12 provided on the outer peripheral surface.

[0028] Such the bobbin 21 of the electromagnetic coil 2 mounting hole 210 is provided a through-hole, the mounting hole 210 twice inverting input member 4, times non-inverted output member 5 and carp
The electromagnetic spring clutch of the present invention is formed by fitting a part of each of the springs 6 .

[0029] The contact magnetizing member 3, the spring support cylinder 3 provided with a spring fitting hole 340 which itself is fitted into the rear side of the coil spring 6 for biasing the extending direction is applied are compressed
4, a ring spring 38 provided adjacent to the back side of the spring support cylinder 34, and rivets 3
And an armature 39 made of a magnetic material that is integrally connected through a pair 81. The rivet 381 is inserted into a connection hole 39b provided in the armature 39 and a connection hole 38c provided in the ring spring 38 and caulked.

The front end of the coil spring 31 is provided with a first locking claw 61 formed by being bent inward, and the rear end of the coil spring 31 is formed by being bent outward. A second locking claw 62 is provided. The spring support cylinder 34 has a flange 3 protruding annularly at the center.
6, a first bush 35 extends to the right of the flange, and a second bush 3 extends to the left of the flange.
7 is extended. The flange 36 has a rivet 3
A connection hole 36b through which the hole 81 is inserted is formed.

On the inner peripheral surface 380 of the ring spring 38, a plurality of convex pieces 38a are provided so as to project toward the axis. As shown in FIG. 6, the protruding piece 38a is bent toward the right, and a connection hole 38b through which the rivet 381 passes is formed in the bent portion. A rivet 38 is inserted into the connection hole 38b and the connection hole 36b.
1 is inserted and swaged, so that the ring spring 38 and the spring support cylinder 34 are connected to each other. The spring 39 is provided on the inner peripheral surface 390 of the amateur 39.
, The ring spring 38 and the armature 39 are riveted to each other.
The notch 39 for releasing the head of the rivet 381 is provided at a position corresponding to the head of the rivet 381 connecting the rivet 381 with the rivet 381.
a is provided.

The flange 36 of the spring support cylinder 34 has a first cutout groove opening outward for opening the head of the rivet 381 connecting the ring spring 38 and the armature 39 corresponding to the rivet 381. 36a is provided. Further, the spring fitting hole 340 of the spring support cylinder 34 is provided.
A second notch groove 37a extending in the horizontal direction for locking the second locking claw 62 of the coil spring 6 is formed in the inner peripheral surface of the coil spring 6 .

Next, the rotary input member 4 is composed of an input gear 41 having a tooth surface formed on the outer peripheral surface for receiving a rotational drive outside the system, and a sintered product for relaying the rotation of the input gear 41. And a pressing cylinder 45. The pressing cylinder 45 has an annular flange 48 protruding from the center thereof, a first bush 46 extending from the front side of the flange 48, and a second bush 47 extending from the rear side. .

A pair of locking projections 47a facing each other are provided on the leading edge of the first bush 46 in parallel with each other so as to project outward. An insertion hole 411 for inserting the 46 is formed. A locking groove 42 corresponding to the locking projection 47a of the first bush 46 is cut in the inner peripheral surface of the insertion hole 411. Therefore, the pressing cylinder 45 is fitted into the mounting hole 210 of the electromagnetic coil 2 housed in the cylindrical case 11,
A pair of locking projections 47a protruding from the sleeve 14 to the outside
Is fitted into the locking groove 42 so that the pressing cylinder 45 and the input gear 41 are coupled to rotate together.

The second bush 47 of the pressing cylinder 45
The outer diameter is set to be slightly smaller than the inner diameter of the coil spring 6 so that it can be fitted into the coil spring 6 . A locking hole 48 a is formed in the outer peripheral surface of the second bush 47, and a first locking claw 6 provided at an end of the coil spring 6 is provided.
1 can be fitted. Therefore,
Attach the coil spring 6 to the second bush 47 of the pressing cylinder 45
Then, the first locking claw 61 is locked in the locking hole 48a, and the second
The pawl 62 is connected to the spring support cylinder 34, the ring spring 38, and the arm.
The contact magnetizing member 3 Chua 39 are formed and assembled
By being locked in the second cutout groove 37a of the spring support cylinder 34, the magnetizing member 3 and the rotation input member 4 are connected so as to rotate together.

The rotation output member 5 has a shaft hole 51.
1, a cylindrical output shaft 51, a crown body 53 detachably connected to a rear end of the output shaft 51, and a rotor 57 integrally connected to the crown body 53. ing. At the left end of the output shaft 51, as shown in FIG.
A notch 52 having a U-shape is formed, and the notch 52 forms a locking arc 520 on the back side of the output shaft 51.

An annular groove 5 is formed on the right end peripheral surface of the output shaft 51.
1a is provided, and a circular arc groove 52a is provided at the left end of the locking circular arc portion 520. The annular groove 5
The 1a, together with the C-ring 71 shown in FIGS. 1 and 2 is fitted, a C-ring 7 2 in the arcuate groove 52a is fitted, they, the output shaft 51 from the casing 1 of the electromagnetic clutch assembled It plays a role in preventing escape. The outer diameter of the output shaft 51 is set slightly smaller than the insertion hole 451 of the pressing cylinder 45, and the output shaft 51 can be inserted through the insertion hole 451.

On the other hand, as shown in FIG.
The outer peripheral surface has a first peripheral surface 54 having a maximum outer peripheral diameter, a third peripheral surface 56 having a minimum outer peripheral diameter, and a second peripheral surface 55 having an intermediate outer peripheral diameter sandwiched therebetween. It has a three-stage structure. Further, the crowned body 53 is formed with an arc hole 531 corresponding to the locking arc portion 520 having the flat portion 56a formed in the direction in which the axial center extends from the back side toward the substantially central portion. Subsequently, a circular hole 540 corresponding to the output shaft 51 is provided toward the front side.

As described above, according to the present invention, since the output shaft 51 and the crowned body 53 are manufactured separately from each other, the rotary output member 5 is different from the conventional case where they are integrated. And easy to manufacture. Also, the output shaft 51
Since the crowned body 53 and the crowned body 53 are separate bodies, the crowned body 53 can be made of a sintered product, and the output shaft 51 can be made of a stainless steel material. Become. Further, as shown in FIG. 4, the arc-shaped hole 531 of the crowned body 53 is formed from the opening on the left side of the crowned body 53 to substantially the center, and the tip of the arc-shaped hole 531 is a circular hole 540. Compared with the case of forming the arc hole 531, the presence of the circular hole 540 improves the accuracy of the coaxiality between the crowned body 53 and the output take-out axis X fitted into the crowned body 53, so that both can rotate together. This is convenient because no swing occurs.

In this embodiment, as shown in FIG. 4, the flat portion 56a is formed from the left opening to the substantially central portion of the arc hole 531. However, the flat portion 56a is limited to the substantially central portion. However, from the viewpoint of facilitating the manufacture of the crowned body 53, the arc hole 531 may be provided over the entire length of the head 53 in the axial direction. In that case,
In accordance with this, the length of the cutout portion 52 of the output cylinder 51 in the axial direction may be increased to correspond to the flat portion 56 a extending over the entire length of the head 53.

Accordingly, the output shaft 51 is connected to the crowned body 5 from the left end.
3 is inserted into the circular hole 540, the locking circular arc portion 520 is fitted into the circular arc hole 531, and the flat shaft portion 56 a of the crowned body 53 and the cutout portion 52 of the output shaft 51 are stopped to lock the output shaft 51 and the crowned body. The relative movement of the output shaft 51 and the crown body 53 in the circumferential direction is prevented, and the output shaft 51 and the crowned body 53 can rotate together around the axis. The outer diameter of the first peripheral surface 54 of the crowned body 53 is
The dimensions are set so as to be substantially equal to the outer diameter of the second bush 47 of No. 5.

The rotor 57 is press-fitted integrally with the second peripheral surface 55 of the crowned body 53 so that they rotate together. In the case of this embodiment, the rotor 57 is
8 and the inner ring 58a are connected by a plurality of connecting pieces 589. The inner diameter of the inner peripheral surface 570 of the inner ring 58a is set slightly smaller than the outer diameter of the outer peripheral surface of the second peripheral surface 55 of the crowned body 53, and the rotor 57 is pressed into the crowned body 53 with a large pressing force. Therefore, the crowned body 53 and the rotor 57 are integrally connected so as to rotate together. In addition, the crowned body 5
The connection between the rotor 3 and the rotor 57 is not limited to the press-fitting, but may be such that projections and depressions for fitting are formed on the contact surfaces of each other and the projections and depressions are fitted together.

The outer diameter of the third peripheral surface 56 is equal to that of the bearing plate 15.
Are set slightly smaller than the inner diameter of the insertion hole 150. Therefore, the third peripheral surface 56 is inserted into the insertion hole 1 of the bearing plate 15.
By being inserted through 50, the crowned body 53 is supported by the bearing plate 15 so as to be rotatable around the axis.

Then, the bearing plate 15 and the back cover 17 are mounted on the crowned body 53 of the rotation output member 5 composed of the output shaft 51, the crowned body 53 and the rotor 57, and the output shaft 51 is locked. C-ring 7 2 is attached to the arcuate groove 52a provided in the arcuate portion 520. Then the output shaft 51 is tubular casing 1 1 contact magnetizing member 3 amateur 39 are decorated, the ring spring 38, is fitted to the spring support tube 34 and the pressing cylinder 45, further input gear 41 to the right end of the output shaft 51 With the annular groove 51a protruding outside from the insertion hole 411, the C
Electromagnetic spring clutch is obtained according to the present invention as shown in FIG. 2 by mounting the ring 7 1.

The output shaft 51 of such an electromagnetic spring clutch
The output drive shaft X is inserted into and fixed to the shaft hole 511, so that the rotation driving of the input gear 41 supplied from outside the system is performed by the pressing cylinder 45, the coil spring 6 , the spring supporting cylinder 34,
Ring spring 38, is transmitted to the crown設体53 through the armature 3 9 Contact and rotor 57 is transmitted to the output shaft 51 which is fitted to rotate together further to the crown設体53, this
It adapted to be taken out to the thus external output extraction axis X of the shaft hole 511 is inserted and fixed in the output shaft 51.

Since the electromagnetic spring clutch of the present invention is configured as described above, if the supply of power to the electromagnetic coil 2 is cut off, no magnetic lines of force are generated from the electromagnetic coil 2, and as a result, The amateur 39 moves rightward by the urging force of the ring spring 38, and as shown in FIG. 5, the so-called clutch in which the pressing and stopping of the rotor 57 has been released is disengaged. Therefore, in this state, the rotation of the spring support cylinder 34 is not transmitted to the crowned body 53, and eventually, the rotation drive outside the system supplied to the input gear 41 is not transmitted to the output extraction shaft X.

Next, when electric power is supplied to the electromagnetic coil 2 via the lead wire 24, magnetic lines of force are generated from the coil wire 22, and the sleeve 14, the output shaft 51, the rotor 57, Since an annular magnetic path is formed through the cylindrical case 11, the armature 39 is attracted in the direction of the rotor 57 by the action of the lines of magnetic force passing through the magnetic path. As a result, as shown in FIG. 6, the armature 39 moves in the direction of the rotor 57 against the urging force of the ring spring 38, so that the armature 39 and the rotor 57 come into contact with each other, and the spring support cylinder 34 A so-called clutch in which rotation is transmitted to the rotor 57 is engaged.

When the clutch is engaged, the rotor 57 is moved to the second locking claw of the coil spring 6 via the spring support cylinder 34, the ring spring 38 and the armature 39.
62 and to become a connection state, if the same as the rotation direction of the input gear 41 to the winding direction of advance the coil spring 6, the pressing cylinder is locked with the first locking claw 61 of the carp <br/> Rubane 6 Due to the rotation of the input gear 41 integral with 45, the coil spring 6 is twisted and reduced in diameter, so that the first peripheral surface 54 of the crowned body 53 and the second bush 47 of the pressing cylinder 45 are simultaneously tightened. The connection between the member 4 and the rotation output member 5 is reliably performed, and the rotation of the input gear 41 is transmitted to the output extraction shaft X.

By the way, the conventional output tube 510, that the shape is difficult to process a complex and metal, and the outer peripheral surface is rotated together with each other by the diameter of the coil spring 31 0 head 53 0 and the press cylinder 450 Since they must be connected as much as possible, sintered products of ceramics and metal powder molded products with a large coefficient of friction have been applied.However, the coefficient of friction for such ceramics and other metals is large, and further compared to metals. Te have high strength, the rotation of the output tube 510 of the pressing cylinder 45 in 0 a metal is not smoothly performed, the inner circumferential surface of the pressing cylinder 45 0 is worn in a short period of time, that the life of the electromagnetic clutch is shortened There were inconveniences.

Therefore, in the present invention, in order to solve the above-mentioned inconvenience, it is preferable that the frictional resistance is large. As the material of the shaft 51, a material having a smaller coefficient of friction than that of the sintered product is applied, and these are combined to form the rotary output member 5. Specifically, metal is applied as a material having a small friction coefficient. The type of metal is not particularly limited, and a steel material such as ordinary carbon steel or stainless steel can be suitably applied. However, stainless steel excellent in rust prevention effect is more preferable.

[0051]

As described in detail above, in the electromagnetic spring clutch of the present invention, the rotation output member is connected to the crowned body on which the rotor is fixedly mounted and coaxially and corotatably connected to the crowned body. is composed of a circle arc hole that having a flat portion for engaging the inner peripheral surface to the crown設体is provided, engaging arcuate portion at one end which corresponds to the arcuate slot of the output shaft Is formed, and the crowned body and the output shaft are coupled so as to be able to rotate together by fitting the locking arc portion into the arc hole.

As described above, since the crown member and the output shaft which constitute the rotary output member are formed separately from each other, the manufacturing is easier than in the case where they are integrated from the beginning, and the manufacturing cost of the rotary output member is increased. This is extremely advantageous in reducing the amount of light.

The crowned body is provided with a circular arc hole having a locking flat portion on the inner peripheral surface, and a locking circular arc portion corresponding to the circular arc hole is formed at one end of the output shaft. Because
By fitting the locking arc portion of the output shaft into the arc hole of the crowned body, the flat portion of the crowned body and the flat portion of the locking arc portion are stopped, and the output shaft and the crowned body can be easily connected. It becomes possible to join together so that it can rotate together.

The arc hole is formed from the opening to the middle of the crown body in the axial direction, and a concentric hole into which the output shaft is inserted is formed in the crown body following the arc hole. Presence improves the accuracy of the coaxiality between the crowned body and the output take-out shaft X that is fitted into the crowned body. It is.

Further, if the crown member is formed of a sintered material and the output shaft is formed of a material having a smaller coefficient of friction than the sintered material, the outer peripheral surface of the output shaft becomes the inner peripheral surface of the pressing cylinder. As a result, friction loss due to rotation of the output shaft performed while sliding is reduced, and smooth rotation of the output shaft is realized, and damage to the pressing cylinder and the output shaft is suppressed.

Further, when the output shaft is made of metal, the coefficient of friction is advantageously smaller than that of a conventional sintered material.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an example of an electromagnetic spring clutch according to the present invention.

FIG. 2 is a cross-sectional view illustrating a state where the electromagnetic spring clutch of FIG. 1 is assembled.

FIG. 3 is a cross-sectional view illustrating an output shaft of a rotation output member.

FIG. 4 is a cross-sectional view illustrating a crowned body of a rotation output member.

FIG. 5 is a cross-sectional view illustrating a clutch mechanism, showing a state in which the clutch is disengaged.

FIG. 6 is a cross-sectional view illustrating a clutch mechanism, showing a state where a clutch is engaged.

FIG. 7 is a partially cutaway perspective view illustrating a conventional electromagnetic spring clutch.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Casing 11 Cylindrical case 12 Code hole 13 Arc projection 13a Engagement groove part 14 Sleeve 140 Insertion hole 15 Bearing plate 150 Insertion hole 16 Engagement convex part 16a Flat side surface 17 Back lid 17a Flat inner surface 170 Lock window 18 Arc projection 18a Stop groove portion 19 Locking protrusion 2 Electromagnetic coil 21 Bobbin 210 Mounting hole 22 Coil wire 23 Annular wall 24 Lead wire 3 Magnetizing member 34 Spring support cylinder 340 Spring insertion hole 35 First bush 36 Flange 6 Coil spring 61 First Locking claw 62 2 Locking claw 36a First cutout groove 37 Second bush 37a Second cutout groove 38 Ring spring 380 Inner peripheral surface 38a Convex piece 38b, 38c Connection hole 39 Amateur 39a Notch groove 39b Connection hole 4 Rotation input member 41 Input Gear 411 Insertion hole 42 Locking groove 45 Pressing cylinder 451 Insertion hole 46 Bush 47 Second bush 48 Flange 48a Lock hole 5 Rotation output member 51 Output shaft 511 Shaft hole 51a Annular groove 52 Notch 52a Arc groove 53 Crowned body 531 Arc hole 54 First peripheral surface 55 Second peripheral surface 56 Third Peripheral surface 56a Flat portion 57 Rotor 570 Inner peripheral surface 58 Outer ring 59 Inner ring 589 Connecting piece 7 1 C ring 7 2 C ring

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16D 27/10

Claims (4)

(57) [Claims] To 1. A cylindrical casing, an electromagnetic coil having an axial through hole, engaged with the one end of the co Irubane, and contact magnetizing member that having a axially through holes, in the axial direction A pressing cylinder having a through-hole, connected so as to co-rotate with an input gear outside the casing, and fitted into the through-hole of the electromagnetic coil while being engaged with the other end of the coil spring; A rotary output member fitted into the through-hole and having its own axial through-hole; an armature protruding in the radial direction in an annular shape in the member for magnetism; provided ring-shaped rotor projecting direction, the rotation transduction to rotary output member of the input gear by Thus the rotor excitation magnetic of the electromagnetic coil and the armature is magnetically attracted bonding is performed , The above electromagnetic
The rotor and amateur are separated by the demagnetization of the
Transmission of the input gear to the rotation output member
The electromagnetic spring clutch that is configured to be, the rotation output member, a crown設体the upper SL rotor is fixed,
This crown設体concentric co-rotation can be coupled to an output take-out
An output shaft having a shaft hole into which the shaft is inserted , wherein the crowned body is provided with an arc hole as the through hole having a flat portion for locking on an inner peripheral surface, and one end of the output shaft A locking arc portion corresponding to the arc hole is formed in the portion, and the capping body and the output shaft are corotatably coupled by fitting the locking arc portion into the arc hole. Characteristic electromagnetic spring clutch. 2. The method according to claim 1, wherein the circular arc hole is formed from the opening to a point in the axial direction of the crowned body, and a concentric circular hole into which the output shaft is inserted is formed in the crowned body following the circular arc hole. The electromagnetic spring clutch according to claim 1, wherein: 3. The method according to claim 1, wherein the crown body is formed of a sintered material, and the output shaft is formed of a material having a smaller coefficient of friction than the sintered material. Electromagnetic spring clutch. 4. The electromagnetic spring clutch according to claim 3, wherein said output shaft is made of metal.