JPH0348421Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The invention controls the tightening force of a clutch spring wound around bosses of the same diameter and concentrically facing each other and protruding from an input member and an output member. The present invention relates to an electromagnetic spring clutch for controlling torque transmission between the input member and the output member.

<Prior art> Directional spring clutches, which use coil springs wrapped around concentric bosses of the same diameter that collide with each other, have a simple structure and excellent durability, so they are used in a variety of applications. has been done. Such a spring clutch merely has the directionality of torque transmission and cannot be freely connected or disconnected; however, a member that controls the tightening force of the coil spring as a clutch spring can be selectively driven, for example, by electromagnetic force. By doing so, an electromagnetic spring clutch that not only has directional torque transmission but also can be freely engaged and engaged is realized.

For example, Japanese Patent Application Laid-Open No. 59-175633 discloses a structure in which a rotor that is rotatably provided on a rotating shaft is provided with an armature that moves toward and away from the rotor by electromagnetic force, and the tightening force of a clutch spring is controlled by the movement of the armature. is proposed. In this structure, the rotor that constitutes a part of the solenoid device rotates, so the structure of the solenoid device is relatively complicated. There is a problem in that it requires a large amount of man-hours.

Japanese Utility Model Publication No. 61-4034 discloses an electromagnetic spring clutch using a flapper type solenoid, but the clutch also has a large number of parts and requires a large amount of man-hours to assemble.

<Problems to be solved by the invention> In view of these problems of the prior art, the main purpose of the present invention is to provide an electromagnetic spring clutch that has a small number of parts and is easy to assemble. .

<Means for Solving the Problems> According to the present invention, this object is achieved by winding the clutch spring around bosses of the same diameter and concentrically facing each other and protruding from the input member and the output member. An electromagnetic spring clutch that controls torque transmission between the input member and the output member by controlling tightening force, the clutch being engaged with one end of the clutch spring and movable relative to the input member. The device includes a sleeve, a ratchet attached to the sleeve, a fixed pawl that can be selectively engaged with the ratchet, and a solenoid for selectively driving the pawl. By elastically deforming an elastically deformable enlarged head formed at a free end of an axially extending portion integrally provided on either one, the axially extending portion is connected to the input member and This is achieved by providing an electromagnetic spring clutch which is fitted into the axial center hole of the other output member for relative rotation.

<Function> In this way, the clutch part is assembled by elastically engaging the extension part provided on one of the input member and the output member with the other member, so the manufacturing man-hours are reduced. be done.

<Embodiments> The present invention will now be described in detail with reference to specific embodiments with reference to the accompanying drawings.

1 to 5 show a first embodiment of an electromagnetic spring clutch according to the present invention. In this electromagnetic spring clutch 1, one end of the output shaft 2 is partially cut away as a cutout 2a to have a D-shaped cross section. A stepped collar 6 serving as an output member is fitted onto this output shaft 2, and a portion thereof is engaged with the cutout portion 2a, so that the output shaft 2
rotates integrally with. This stepped collar 6 extends from the right end to the left end in FIG.
The shoulder portion 7a, the boss portion 8, the extension portion 9, and the enlarged head portion 10 that is located at the free end of the extension portion and projects outward in the radial direction.
It consists of. The extending portion 9 is provided with a plurality of slits 9a from its free end toward the center.
A gear 12 serving as an input member is rotatably fitted into the extending portion 9 and integrally includes a facing boss member 11 that is concentric with and has the same diameter as the boss portion 8 .

The right end of the output shaft 2 in FIG. 1 and the vicinity of the free end of the extension portion 9 are pivotally supported by a pair of frames 3 and 4 via bearing members 5 and 13, respectively.
A clutch spring 1 made of a coil spring is provided on the outer periphery of the boss portion 8 and the boss member 11 that face each other.
4 is wound around the sleeve 1, which is supported by the recess 12a of the gear 12 and the shoulder 7a of the stepped collar 6.
Surrounded by 5. The clutch spring 1 is inserted into the slot 15a provided in the sleeve 15.
One end 14a of 4 is engaged. A radial flange 16 is integrally provided on the outer periphery of the sleeve 15, and a ratchet 16a is formed on the right axial end surface of the flange in FIG.

An annular yoke 1 is provided on the outer periphery of the stepped collar member 6.
The yoke 17 has an outer peripheral part 17a, an inner peripheral part 17b, and a bottom part 17c fixed to the frame 4, and a coil 19 is mounted inside the yoke 17. Ring-shaped armature 21
A pair of projecting pieces 22 are arranged concentrically on the left side of the yoke 17 in FIG. Complementary slots 20
It has been accepted by Further, a pawl 24 is cut and raised on the inner circumferential edge of the armature 21, protrudes on the opposite side from the projecting piece 22, and can be engaged with the ratchet 16a in accordance with the movement of the armature 21 in the axial direction. Further, the armature 21 is moved in the direction away from the yoke 17 by the compression coil spring 23, that is, in the direction of the ratchet 16.
It is biased in the direction of engagement with a.

Next, the assembly procedure of this embodiment will be explained.

First, the bearing member 13 is attached to the frame 3, and the enlarged head 10 of the collar 6 is elastically deformed so that the extension portion 9
By fitting the center hole of the gear 12 into the clutch spring 14, the gear 12, and the sleeve 15,
etc. are fitted into collar 6. Solenoid devices such as a yoke 17 and a coil 19 are attached to the frame 4. Next, by similarly deforming the enlarged head 10 elastically, it is fitted into the bearing member 13,
The relative axial direction is prevented from coming off, and then the bearing member 5 of the frame 4 is fitted to the end of the output shaft 2,
Both frames 3, 4 are connected to each other, for example by screws.

Next, the operation of this embodiment will be explained.

As shown in FIG. 1, when the coil 19 is demagnetized, the armature 21 is engaged with the ratchet 16a, so even if the gear 12 as an input member is rotating. Regardless,
Since one end 14a of the clutch spring 14 is fixed via the sleeve 15, the clutch spring 14 cannot be wound around the collar member 11, and the torque of the gear 12 is not transmitted to the stepped collar member 6 or the output shaft 2. It is never transmitted to

Next, when the coil 19 is energized, the protrusion 22 is drawn into the slot 20, and the pawl 24 engages the ratchet 16.
and leaves. As a result, the sleeve 15 becomes free, and as the gear 12 rotates, the clutch spring 14 wraps around the collar member 11 and the boss 8.
The torque of the gear 12 is applied to the stepped collar 6 and the output shaft 2.
It will be transmitted to

When the coil 19 is demagnetized again, the pawl 24 engages with the ratchet 16a, so that the sleeve 15
is fixed, and at the same time, a force is applied to one end 14a of the clutch spring 14 in the direction of winding and unwinding the clutch spring, and the clutch is disengaged.

FIG. 6 shows a second embodiment of the invention. In this electromagnetic spring clutch 31, the output shaft 3
A cutout 32a having a D-shaped cross section is formed at the right end of the output shaft 32, and a stepped collar 35 fitted on the output shaft 32 is engaged with the cutout 33 to be integrally combined. This stepped collar 35 includes, from right to left in FIG.
7 and an enlarged head 38, and the extension part 3 is similar to the above.
7 is provided with an axial slit 37a. A gear 42 serving as an input member is rotatably fitted into the extending portion 37 against the elastic force of the enlarged head 38 . The boss portion 43 of the gear 42 and the boss member 39 are concentric and have the same outer diameter, and a clutch spring 45 is wound around the outer periphery thereof.

The sleeve 4 is supported by a recess 44 formed in the gear 42 and a shoulder 36a of the stepped collar 35.
6 surrounds this clutch spring 45. Also, one end 45a of the clutch spring 45
is engaged with a slot 46a provided in the sleeve 46. This clutch spring 45 is
As shown in the figure, the portion surrounding the boss portion 39 has a slightly larger diameter, and this clutch spring 45
is in contact with the boss portion 43 with a certain degree of pre-rolling force, whereas it is opposed to the boss portion 39 with a certain gap. A ratchet 47 is fitted around the outer periphery of the sleeve 46 so as to be relatively rotatable, and a conical compression coil spring 48 causes the ratchet 47 to abut against the outward flange 46b of the sleeve 46 with a certain degree of frictional force. are in contact with each other.

An annular yoke 49 having a U-shaped cross section is fixed to the frame 33 made of a metal plate, and a coil 50 is mounted inside the yoke 49 . 6th of yoke 49
An annular armature 51 faces the left axial end in the figure, that is, the open end, and the frame 3
The armature 51 is connected to the yoke 4 by a compression coil spring 53 held between the yoke 3 and the armature 51.
9, and is biased in a direction away from frame 3.
A limit to which the armature 51 can move away from the yoke 49 is determined by a stopper 54 cut and raised from the yoke 49.

One end of the output shaft 32 is connected to the center hole 3 of the frame 33.
3a, and the annular surface at the right end of the stepped collar 35 is in contact with the frame 33. Here, the enlarged head portion 41a at the free end of the extending portion 41 integrally protruding from the stepped collar 35 deforms elastically and passes through the inner hole of the bearing member 40, whereby the stepped collar 35 and frame 33 are prevented from coming off in the axial direction.

The armature 51 is provided with a pawl 52 that protrudes leftward from the lower side in FIG. 6, and the pawl 52 engages and disengages from the ratchet teeth 47a in response to movement of the armature 51 in the axial direction.

Next, the operation of this embodiment will be explained. In the state shown in FIG. 6 in which the coil 50 is energized, the pawl 52 is engaged with the ratchet teeth 47a, so that the sleeve 46 is fixed by the frictional force generated by the conical coil spring 48. Retained. Therefore, when the gear 42 rotates, since the one end 45a of the clutch spring 45 is engaged with the sleeve 46, a force is generated that tightens the clutch spring 45, and the torque of the gear 42 is applied to the stepped collar 35. and is transmitted to the output shaft 32.

Next, when the coil 50 is demagnetized, the armature 51 moves to the left due to the restoring force of the compression coil spring 53.
The pawl 52 separates from the ratchet tooth 47a. As a result, the sleeve 46 is driven by the gear 42 due to frictional force, and the clutch spring 4
5 separates from the boss portion 39 due to its own restoring force,
Transmission of torque from gear 42 to stepped collar 35 is interrupted.

Next, when the coil 50 is energized again, the armature 51 moves to the right and the pawl 52 engages with the ratchet teeth 47a, thereby fixing the sleeve 46 and applying a force to tighten the clutch spring 45 again. Torque is now transmitted from the gear 42 toward the stepped collar 35 and the output shaft 32.

In the case of this embodiment, when the coil 50 is demagnetized, that is, when the clutch is disconnected, the output shaft 32 side is driven by the air gap provided between the clutch spring 45 and the boss portion 39. Even when driven in rotation by the object, no undesirable forces are exerted on the clutch.

7 and 8 show an electromagnetic spring clutch according to the present invention using a flapper type solenoid.

This embodiment uses a clutch device similar to the embodiments shown in FIGS.
A stepped collar 64 is fitted onto the output shaft 62 so as to engage with the second cutout 62a. Like the collar 6 described above, this stepped collar 64 has a large diameter portion 65, a shoulder portion 65a, a boss portion 66, an extension portion 67, and an enlarged head portion 68, and the extension portion 67 has an axial slit 67a. is provided and the gear 69
A boss member 70 is rotatably fitted. Further, the free end of the extension portion 67 is fitted into a hole in the frame 63 via a bearing member 71. Boss part 66
and a clutch spring 7 on the outer periphery of the boss member 70.
2 is wound around the sleeve 7, one end 72a of which is supported in the shoulder 65a and the recess 69a of the gear 69.
It is engaged with the slot 73a of No. 3.

A cylindrical core 74 is provided at the base end of the frame 63.
A solenoid device consisting of a coil 75 and a coil 75 wound around its outer periphery is attached. frame 63
An armature 76, which is pivotably supported on the cut-out portion 63a, is tilted and driven by the balance between the spring force of the tension coil spring 78 and the suction force of the core 74. A pawl 77 is bent at the free end of the armature 76 and can selectively engage with ratchet teeth 73b formed on the outer periphery of the sleeve 73.

This embodiment is substantially the same as the embodiment shown in FIGS. 1 to 5, except for the structure of the claw 77 and the solenoid device, and a description of its operation will be omitted.

9 and 10 show a fourth embodiment of the present invention.

In the electromagnetic spring clutch 81 of this embodiment, a cutout 82a is formed at one end of the output shaft 82, and a stepped collar 84 fitted on the output shaft 82 engages with the cutout 82a. Output shaft 8
Rotates integrally with 2. This stepped collar 84
is similar to the collar 35 of the embodiment shown in FIG.
9, has an extension part 87 and an enlarged head part 88, the extension part 87 is provided with a slit 87a, a boss part 91 of a gear 90 is fitted, and its free end is connected to the bullet of the enlarged head part 88. Against the force, frame 83
is fitted into the hole with a bearing member 96 interposed therebetween. One end 92a of the clutch spring 92 wound around the outer periphery of the boss portion 91 and the boss member 89 is connected to the shoulder portion 85a of the stepped collar 84 and the recess 90a of the gear 90.
It engages in a slot in a sleeve 93 supported by. A ratchet 94 is rotatably fitted around the outer periphery of the sleeve 93, and the ratchet 94 is pressed against a flange 93a projecting outward from the outer periphery of the sleeve 93 by a conical coil spring 95 as in the previous embodiment.

A cylindrical core 9 is provided on the base end side of the frame 83.
7 is erected, and a coil 98 is wound around its outer periphery. An armature 99 is tiltably supported on the cut-and-raised portion 83a of the frame 83, and is tiltable in balance with the suction force from the tension coil spring 101 and the core 97. A formed pawl 100 can selectively engage the ratchet teeth 94a. still,
Reference numeral 99a is a stopper that comes into contact with the cut and raised portion 83a to determine the position of the armature 99 when the engagement between the pawl 100 and the ratchet teeth 94a is released.

This embodiment is also based on substantially the same operating principle as the embodiment described above with reference to FIG. 6, and the explanation of its operating principle will be omitted.

FIG. 11 shows a fifth embodiment of the present invention, which has substantially the same structure as the fourth embodiment,
Corresponding parts are given the same reference numerals, and detailed explanation thereof will be omitted. In this embodiment, the coil 10
2 is inverted, and the clutch member and the solenoid portion are arranged adjacent to each other on the left and right sides, so that the height of the entire clutch device can be reduced.

<Effects of the invention> As described above, according to the invention, the clutch member can be easily assembled, the number of manufacturing steps is reduced, and the manufacturing cost is significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a side view showing the upper half of a first embodiment of the electromagnetic spring clutch according to the present invention. FIG. 2 is a front view of the yoke of FIG. 1. FIG. 3 is a sectional view of FIG. 2. FIG. 4 is a front view of the armature shown in FIG. 1.
FIG. 5 is a sectional view of FIG. 4. FIG. 6 is a diagram similar to FIG. 1 showing a second embodiment based on the present invention. 7 and 8 are a partially cutaway side view and a front view showing a third embodiment of the present invention. 9th
FIGS. 7 and 10 are similar views to FIGS. 7 and 8, showing a fourth embodiment of the present invention. FIG. 11 is a diagram similar to FIG. 10 showing a fifth embodiment of the present invention. 1...Spring clutch, 2...Output shaft, 2
a... Cutout portion, 3, 4... Frame, 5... Bearing member, 6... Stepped collar, 7... Large diameter portion, 7a
...Shoulder part, 8...Boss part, 9...Extension part, 9a...
...Slit, 10... Enlarged head, 11... Boss member, 12... Gear, 12a... Recess, 13... Bearing member, 14... Clutch spring, 14a...
...One end, 15...Sleeve, 15a...Slot, 16...Outward flange, 16a...Ratchet tooth, 17...Yoke, 17a...Outer periphery, 17
b...inner circumference, 17c...bottom, 19...coil, 20...slot, 21...armature,
22... Projection piece, 23... Compression coil spring, 24...
...Claw, 31...Spring clutch, 32...Output shaft, 32a...Removed portion, 33...Frame, 3
3a... Center hole, 35... Stepped collar, 36...
...Large diameter part, 36a...Shoulder part, 37...Extension part, 3
7a...Slit, 38...Enlarged head, 39...Boss member, 40...Bearing member, 41...Extension part, 4
1a... Enlarged head, 42... Gear, 43... Boss, 44... Recess, 45... Clutch spring, 45a... One end, 46... Sleeve, 46a
...Slot, 46b...Outward flange, 47...
...Ratchet, 47a...Ratchet tooth, 48...
... Conical coil spring, 49 ... Yoke, 50 ... Coil, 51 ... Armature, 52 ... Claw, 53
...Compression coil spring, 54...Stopper, 61...
...Spring clutch, 62...Output shaft, 62a
...Removed portion, 63...Frame, 63a...Cut-out portion, 64...Stepped collar, 65...Large diameter portion, 65a...Shoulder portion, 66...Boss portion, 67...
Extension part, 67a...slit, 68... enlarged head,
69... Gear, 69a... Recess, 70... Boss member, 71... Bearing member, 72... Clutch spring, 72a... One end, 73... Sleeve, 73
a...Slot, 73b...Ratchet tooth, 74
... Core, 75 ... Coil, 76 ... Armature, 77 ... Claw, 78 ... Tension coil spring, 81
... Spring clutch, 82 ... Output shaft, 82
a... Cutout section, 83... Frame, 83a... Cut-and-raised section, 84... Stepped collar, 85... Large diameter section, 85a... Shoulder section, 87... Extension section, 87a...
...Slit, 88...Enlarged head, 89...Boss member, 90...Gear, 90a...Concave portion, 91...Boss portion, 92...Clutch spring, 92a...
One end, 93...sleeve, 93a...outward flange, 94...ratchet, 94a...ratchet tooth, 95...conical coil spring, 96...bearing member, 97...core, 98...coil, 99... Armature, 99a... Stoppa, 100...
Claw, 101... tension coil spring, 102... coil.

Claims (1)

[Claims for Utility Model Registration] (1) By controlling the tightening force of a clutch spring wound around bosses of the same diameter and concentrically facing each other and protruding from the input member and the output member, An electromagnetic spring clutch for controlling torque transmission to and from the output member, comprising: a sleeve that engages with one end of the clutch spring and is movable relative to the input member; and a ratchet attached to the sleeve. , a fixed pawl that can be selectively engaged with the ratchet, and a solenoid for selectively driving the pawl, and an axis that is integrally provided on either the input member or the output member. By elastically deforming the elastically deformable enlarged head formed at the free end of the directional extending part, the axially extending part is moved to the axial center of the other of the input member and the output member. An electromagnetic spring clutch that is fitted into a hole so as to be relatively rotatable. (2) When the pawl and the ratchet engage with each other, the motion of the input member transmits a tightening force to the clutch spring. Electromagnetic spring clutch as described. (3) When the pawl and the ratchet engage with each other, the motion of the input member transmits a force in the winding and unwinding direction to the clutch spring. Electromagnetic spring clutch as described. (4) The solenoid is provided so as to be able to come into contact with and separate from an annular core that concentrically surrounds the axes of the input member and the output member, a solenoid wound around the core, and an end surface of the core. and an armature having a concentric annular disk shape, and the armature is prevented from rotating by having a tongue piece received in a notch cut in the core in the axial direction. Featured utility model registration claims Paragraphs 1 to 3
The electromagnetic spring clutch described in any of the paragraphs.