JP2002061672A - Electromagnetic spring clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic spring clutch superior in the productivity and capable of reducing the manufacturing cost. SOLUTION: In this electromagnetic spring clutch comprising a first rotating shaft 26 rotatably inserted into an armature 38, a second rotating shaft 34 coaxial with the first rotating shaft and rotatably mounted, and a coil spring 40 mounted over outer peripheries of the first rotating shaft and the second rotating shafts, locked on the armature at its one end and on the second rotating shaft at the other end, integrally rotating the first rotating shaft and the second rotating shaft by being tightened when the armature is moved to be abutted on a contact part and is braked, in a state of energizing the electromagnetic coil 10, and releasing the integral rotation of the first rotating shaft and the second rotating shaft in being loosened by separating the armature from the contact part and releasing the braking in a state of not being energized, a bearing part 22 externally and cylindrically projecting by a desired length for bearing the first rotating shaft is integrally formed on a field core 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an electromagnetic spring clutch.

[0002]

2. Description of the Related Art FIG. 16 is a side sectional view showing the structure of a conventional electromagnetic spring clutch 200. In FIG. 16, reference numeral 10 denotes an electromagnetic coil, which is formed by winding a copper wire around a coil bobbin 12 and connected to a power supply (not shown) via a lead wire 14. Reference numeral 16 denotes a field core, which includes a cup portion 16a made of a magnetic material and a lid 16b, and has through holes 20a and 20b, respectively. Reference numeral 60 denotes a clutch attachment plate, which is formed integrally with the field core 16. Reference numeral 22 denotes a bearing, which is formed of a magnetic material and is press-fitted and fixed in the through hole 20a of the field core 16.

[0003] Reference numeral 26 denotes a first rotating shaft, which is formed using a synthetic resin material and is inserted into the field core 16. Reference numeral 29 denotes a D-cut portion formed by cutting the end of the driven shaft 30 into a D-shaped cross section. The driven shaft 30 is inserted into the inner diameter portion of the first rotating shaft 26, protrudes from the end face D of the D cut portion 29 and the inner surface of the first rotating shaft 26, and
6 and an end face of a protruding portion having a D-shaped cross section formed integrally therewith, and rotate integrally with the first rotating shaft 26. A substantially central portion of the first rotating shaft 26 is formed to have a large diameter and serves as a coil spring tightening portion 28 described later. 34 is the second
, And is rotatably fitted to the first rotation shaft 26. An input gear 36 is provided at an end of the second rotation shaft 34.
, And an external force (rotational force) is applied from a mechanism (not shown).

Reference numeral 38 denotes an armature, which is formed of a magnetic material in a substantially cylindrical shape, and is rotatably fitted to the first rotating shaft 26 and the second rotating shaft 34. Reference numeral 40 denotes a coil spring, which is interposed between the outer circumferences of the first rotation shaft 26 and the second rotation shaft 34 and the inner wall of the armature 38, one end of which is disposed on the armature 38, and the other end of which is the second rotation shaft 3.
4. Reference numeral 42 denotes a plate, which is formed of a magnetic material, is disposed on the first rotation shaft 26 and between the inner end surface of the armature 38 and the inner end surface of the bearing 22, and is integrally formed with the first rotation shaft 26. It is rotatable.
Reference numeral 48 denotes a washer, which is provided between the plate 42 and the bearing 22.
It is arranged between. The washer 48 plays a role of sliding when the plate 42 and the first rotating shaft 26 rotate integrally. 50a and 50b are retaining rings that determine the axial position of each component.

[0005]

However, in the electromagnetic spring clutch 200 having the above structure, the bearing portion 22
Since the field core 16a and the field core 16a are separate parts, it is necessary to press-fit and fix the bearing portion 22 to the field core 16a, which increases production cost. In addition, there is a problem in terms of work efficiency due to management of press-fitting jigs and press-fitting equipment used for press-fitting.

The present invention has been made to solve the above problems,
An object of the present invention is to provide an electromagnetic spring clutch which is excellent in productivity and can suppress production cost.

[0007]

An electromagnetic spring clutch according to the present invention is formed of a magnetic material, and is disposed in a field core having a built-in electromagnetic coil;
An armature urged by an electromagnetic coil and movable in an axial direction; and a first armature rotatably inserted into the armature.
And the first rotation axis is coaxial with the first rotation axis.
A second rotating shaft that is rotatably disposed independently of the rotating shaft, and is disposed across the outer circumferences of the first rotating shaft and the second rotating shaft, one end of the armature and the other end of the second rotating shaft. When the armature is locked to the second rotating shaft and energized to the electromagnetic coil, the armature moves and abuts on a contact portion, and the armature is subjected to braking, thereby being wound and tightened. When the first rotating shaft and the second rotating shaft are integrally rotated, and when the electromagnetic coil is not energized, the armature separates from the contact portion, the braking is released, and the tightening is loosened. An electromagnetic spring clutch having a coil spring for releasing the unitary rotation of the first rotation shaft and the second rotation shaft. Protruding the first rotating shaft Bearing portion for bearing is characterized in that it is integrally formed.

The field core comprises a cup formed in a cup shape, and a lid attachable to an open end of the cup. The cup is formed by cutting a predetermined depth from an outer periphery. Preferably, a portion is formed, and a clutch mounting plate formed integrally with the coil bobbin of the electromagnetic coil is formed so as to be able to house the coil bobbin by projecting outward from the cutout portion.

[0009] The cup portion of the field core has a second cutout portion formed by cutting out a predetermined depth from an outer periphery thereof, and a power supply connection terminal box formed integrally with the coil bobbin of the electromagnetic coil. Is preferably formed so as to be able to house the coil bobbin by projecting outward from the second cutout.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments according to the present invention will be described below with reference to the accompanying drawings. 1 is a side sectional view of an electromagnetic spring clutch 100 according to the present embodiment, FIG. 2 is a front view of the electromagnetic spring clutch 100, FIG. 3 is a plan view of a field core, and FIG.
FIG. 5 is a front view of the field core.

In FIG. 1, reference numeral 10 denotes an electromagnetic coil;
An electric wire (copper wire) is wound around a coil bobbin 12 made of a synthetic resin. The coil bobbin 12 has a center hole 12
m, and flanges 12a and 12b are formed at both ends. Reference numeral 60a denotes an extension portion, which extends outward from the end edge of the flange 12a by a required length parallel to the axial direction. 6
Reference numeral 0 denotes a clutch mounting plate, which protrudes outward from the end edge of the extension 60a at right angles to the axial direction. As shown in FIG. 2, the clutch attachment plate 60 is formed in a U-shape by forming a notch 60b. Reference numeral 72 denotes a power supply connection terminal box, which protrudes outward from the flange 12a in a direction opposite to the clutch mounting plate 60 in parallel with the flange 12a and has a box shape. Note that the power supply connection terminal box 72 is provided on the side opposite to the clutch mounting plate 60 of the flange 12a as an example, but the present invention is not limited to this. That is, the power supply connection terminal box 72 is
Can be provided so as to protrude outward from any part of the body in parallel to the axial direction. Reference numeral 74 denotes a power connection terminal, which is press-fitted and fixed inside the power connection terminal box 72. The coil end of the electromagnetic coil 10 is connected to the power supply connection terminal 74. Extension portion 60a, clutch mounting plate 60
And the power supply terminal box 72 is provided with the coil bobbin 12.
And are formed integrally.

Reference numeral 16 denotes a field core, which is formed of a magnetic material and has a cup portion 16a and a lid 16b which can be attached to an open end of the cup portion 16a. The cup portion 16a has a bearing portion 22 projecting outward by a required length into a cylindrical shape by press working and bearing the first rotary shaft 26.
Are formed. Inner corner portion 16 of bearing portion 22
e and 16e are formed on the R surface as shown in FIG.

In FIGS. 2 and 4, reference numerals 16h and 16h denote notches, which are notched by a predetermined depth from the open end of the cup portion 16a.

In FIG. 3, reference numerals 16c and 16d denote notches, which are cut out from the outer periphery of the cylindrical portion 16j of the cup portion 16a by a predetermined depth, and are formed over the entire length of the cup portion 16a. Therefore, the bottom portion 16k of the cup portion 16a
Also, a notch of a required depth is formed.

As shown in FIG. 6, the lid 16b has a center hole 16m, and locking pieces 16f, 16f are protrudingly provided on the outer periphery. The locking pieces 16f, 16f are notches at the edge of the cup portion 16a. By fitting into the portions 16h, 16h, it has a shape that can be attached to the open end of the cup portion 16a.

In FIG. 1, reference numeral 38 denotes an armature, which has a substantially cylindrical shape and is formed using a magnetic material. The armature 38 is rotatably fitted to the first rotation shaft 26 and the second rotation shaft 34, and is slidably received in the center hole 12 m of the coil bobbin 12.

The first rotating shaft 26 is formed in a cylindrical shape using a synthetic resin material. Reference numeral 29 denotes a D-cut portion formed by cutting the end of the driven shaft 30 into a D-shaped cross section. The driven shaft 30 is inserted into the inner diameter of the first rotating shaft 26 made of synthetic resin, and the end face D of the D-cut portion 29 and the first rotating shaft 2
6, the end face of a protrusion having a D-shaped cross section and integrally formed with the first rotary shaft 26 abuts against the inner surface of the first rotary shaft 26, and rotates integrally with the first rotary shaft 26. A substantially central portion of the first rotating shaft 26 is formed to have a large diameter and serves as a tightening portion 28 of a coil spring 40 described later.

Reference numerals 24 and 25 denote positioning portions, which are formed integrally with the end of the first rotating shaft 26. As shown in FIG. 2, the positioning portion 24 has a plurality of slits formed on the outer peripheral surface of the end of the first rotating shaft 26, so that the tongue piece 24 is formed.
a, 24b, 24c, 24d are formed, and outwardly protruding projections are formed at the ends of each tongue piece 24a, 24b, 24c, 24d, and the outer surface of each of the projections is tapered inwardly. A surface is formed. The positioning unit 25
Also has the same configuration as the positioning unit 24.

The second rotating shaft 34 has an input gear 36 formed integrally therewith, is arranged coaxially with the first rotating shaft 26, and is arranged so as to be rotatable independently of the first rotating shaft 26. Is rotatably fitted on the rotation shaft 26 of the rotator.

Reference numeral 42 denotes a plate, and the first rotating shaft 26
Is fixed to the first rotation shaft 26 so as to be able to rotate integrally with the first rotation shaft 26.

Numeral 40 denotes a coil spring, which is disposed over the outer circumferences of the first rotating shaft 26 and the second rotating shaft 34. One end of the coil spring 40 is bent and outwardly bent, and one is bent into the locking groove formed in the armature 38, and the other bent inward is formed into the locking groove formed in the second rotating shaft 34. Into the armature 38 and the second rotating shaft 34.

Next, an assembling procedure for assembling the components described above to form the electromagnetic spring clutch 100 will be described with reference to FIG. First, cup part 1
6a, the coil bobbin 12 is housed from its open end. At this time, the notch 16 formed in the cup 16a
From the positions c and 16d, the clutch mounting plate 60 and the power supply terminal box 72 are housed while being released to the outside of the cup portion 16a.

Next, a lid 16b is attached to the open end of the cup 16a, and is fixed by press-fitting or the like.

Next, a washer 48 is inserted into the first rotating shaft 26 to which the plate 42 is integrally fixed from the positioning portion 25 side. In this state, the first rotary shaft 26 is inserted into the bearing portion 22 from the open end of the cup portion 16a to a position where the position of the first rotary shaft 26 is determined by the positioning portion 25. When the first rotating shaft 26 is inserted into the bearing 22, the first rotating shaft 26 is
The inner corner portions 16e, 16e ride on the tapered surface of the positioning portion 25, so that the tongue pieces 24a, 24b, 2,
4c and 24d are preferably inserted while crushing inward in the radial direction, and are positioned at predetermined positions, and at the same time, are suitably prevented from coming off.

Next, the second rotating shaft 34, to which the armature 38 and the coil spring 40 are assembled, is pushed onto the first rotating shaft 26 from the positioning portion 24 side, and the assembly is completed.

Next, another example of the field core 16 will be described with reference to FIGS. 8 is a plan view of the field core, FIG. 9 is a sectional view taken along the line BB ′ of FIG. 8, and FIG.
Is a front view of the field core, and FIG. 11 is a side view of the field core.

As shown in FIG. 10, the field core 56 is formed by bending a rectangular flat plate to form a U-shape in a frontal shape, and is attached to an open end of the U-shape portion 56a. Lid 56b.

At both ends of the U-shaped portion 56a, notches 56h, 56 into which engagement pieces 56f, 56f of a lid 56b are fitted.
h is formed. At the center of the bottom plate 56k of the U-shaped portion 56a, a cylindrical bearing portion 62 protruding outward is integrally formed by press working. This bearing 62
Supports the first rotating shaft 26 in the same manner as in the first embodiment.

Also, as clearly shown in FIG.
As in the first embodiment, cutout portions 56c and 56d for receiving the extended portion 60a of the coil bobbin 12 and the power supply terminal box are formed at both end portions of the bottom plate 56k. Although notches 56c and 56d are formed at both ends of the bottom plate 56k of the U-shaped portion 56a as an example, the present invention is not limited to this. That is, when the coil bobbin 12 is stored in the U-shaped portion 56a from its open end, the open surface 56 of the U-shaped portion 56a
If the coil bobbin 12 is housed outside the clutch mounting plate 60 and the power supply connection terminal box from the t and 56t, the coil bobbin 12 can be housed in the U-shaped part 56a. Bottom plate 56
It is not necessary to form notches 56c and 56d at both ends of k.

Using the above field core 56, the first
Similarly to the embodiment, the electromagnetic bobbin 12, the armature 38, the coil spring 40, and the second rotating shaft 34 are assembled into an electromagnetic spring clutch.

Next, the operation of the electromagnetic spring clutch 100 according to the present embodiment will be described with reference to FIGS. FIG. 14 is an explanatory diagram showing a state when power is supplied to the electromagnetic coil 10 of the electromagnetic spring clutch 100 according to the present embodiment.

In the state shown in FIG. 1, the electromagnetic coil 10
In a non-energized state, an external force (rotational force) is applied from a mechanism (not shown).
With the rotation of the input gear 36 receiving the rotation, the second rotation shaft 34
The coil spring 40 locked and fixed to the second rotating shaft 34 and the armature 38 locked via the second rotating shaft 34 and the coil spring 40 are idling integrally. At this time, since the coil spring 40 is in a loose state, the first rotating shaft 26 and the driven shaft 30 fixed to the fitting portion 29 of the first rotating shaft 26 remain stationary.

In this state, when the electromagnetic coil 10 is energized, a magnetic circuit indicated by a broken line A in FIG. 14 is formed. Then, the armature 38 is moved to the first rotating shaft 26.
The armature 3 is sucked by the plate 42
The end face of the plate 42 on the plate 42 side is attracted to the end face of the plate 42 on the armature 38 side.

When the end face of the armature 38 is attracted to the plate 42, the rotation of the armature 38 is braked, and a difference is generated between the second rotation shaft 34 and the rotation speed of the armature 38, and the coil spring 40 is narrowed down. The coil spring 40 includes the first rotating shaft 26 and the second rotating shaft 3.
4 so that it is connected. Then, the second rotating shaft 34 and the plate 42 on which the armature 38 is adsorbed
And the driven shaft 30 fixed to the fitting portion 29 of the first rotating shaft 26 starts to rotate integrally with the second rotating shaft 34.

In this manner, the external force input from the input gear 36 can be transmitted to a mechanism (not shown) connected to the driven shaft 30.

When the power supply to the electromagnetic coil 10 is stopped, the suction between the plate 42 and the armature 38 is released, and when the armature 38 rotates again at the same speed as the second rotating shaft 34, the coil The spring 40 loosens the tightening and expands the diameter. Then, the first rotation shaft 26
And the rotation of the driven shaft 30 stops. Although the armature 38 is in contact with the plate 42 (contact portion), the armature 38 may be in contact with the inner surface (contact portion) of the field core 16.

The above description is an example of a preferred embodiment according to the present invention. The present invention is not limited to this embodiment, and may be modified in various ways without departing from the spirit of the invention. Obviously, of course.

For example, in the above embodiment, the bearing portion 22 of the field core 16 is formed in the cup portion 16a or the U-shaped portion 56a, but the present invention is not limited to this. That is, as shown in FIG. 15, the bearing portion 22 may be formed on the lid 16b. FIG.
FIG. 4 is a cross-sectional view showing a state in which a bearing portion 302 protruding outward by a required length in a tubular shape is formed on a lid 300a constituting the field core 300;

[0039]

According to the electromagnetic spring clutch of the present invention, since the field core is integrally formed with the bearing portion for projecting outward by a required length in a cylindrical shape and bearing the first rotating shaft, Thus, the productivity is higher and the production cost can be suppressed.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an electromagnetic spring clutch according to the present embodiment.

FIG. 2 is a front view of the electromagnetic spring clutch according to the embodiment.

FIG. 3 is a plan view of a field core.

FIG. 4 is a sectional view taken along line A-A 'in FIG.

FIG. 5 is a front view of the field core.

FIG. 6 is a plan view showing a lid of the field core according to the present embodiment.

FIG. 7 is a sectional view taken along line A-A 'of FIG.

FIG. 8 is a plan view showing another example of the field core according to the present invention.

FIG. 9 is a sectional view taken along line B-B 'of FIG.

FIG. 10 is a front view showing another example of the field core according to the present invention.

FIG. 11 is a side view showing another example of the field core according to the present invention.

FIG. 12 is a plan view showing another example of the lid of the field core according to the present invention.

13 is a sectional view taken along line A-A 'of FIG.

FIG. 14 is an explanatory diagram showing a state when power is supplied to the electromagnetic coil of the electromagnetic spring clutch according to the present embodiment.

FIG. 15 is a cross-sectional view showing a state in which a bearing is formed on a lid of the field core according to the present invention.

FIG. 16 is a side sectional view showing a configuration of a conventional electromagnetic spring clutch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electromagnetic coil 12 Coil bobbin 14 Lead wire 16 Field core 16a Cup part 16b lid 16c notch part 16d notch part 16e inner corner part 16f engagement piece 16h notch part 16j cylindrical part 16k bottom part 16m center hole 22 bearing part 24 positioning part 25 positioning Part 26 First rotating shaft 28 Winding part 29 D-cut part 30 Driven shaft 34 Second rotating shaft 36 Input gear 38 Armature 40 Coil spring 42 Plate 56a U-shaped part 56b Lid 56c Notch 56d notch 56e Inner corner portion 56f engaging piece 56k bottom plate 56m center hole 56t open surface 60 Clutch mounting plate 62 Bearing portion 72 Power supply connection terminal box 74 Power supply connection terminal

Claims (3)

[Claims] 1. A field core formed of a magnetic material and containing an electromagnetic coil, an armature disposed in the electromagnetic coil and urged by the electromagnetic coil to be movable in an axial direction; A first rotating shaft rotatably inserted; a second rotating shaft coaxial with the first rotating shaft and rotatably arranged independently of the first rotating shaft; When one end is fixed to the armature, the other end is locked to the second rotation shaft, and when the electromagnetic coil is energized, the first rotation shaft and the second rotation shaft are disposed over the outer circumferences of the first rotation shaft and the second rotation shaft. When the armature moves and abuts on the contact portion, and the armature is braked, the armature is tightened to rotate the first rotation shaft and the second rotation shaft integrally, and the electromagnetic coil When power is not supplied to the armature, the armature An electromagnetic spring having a coil spring that releases the braking away from the contact portion, releases the winding, and releases the integrated rotation of the first rotation shaft and the second rotation shaft. An electromagnetic spring clutch, wherein the field core is integrally formed with a bearing portion projecting outward in a cylindrical shape by a required length and bearing the first rotary shaft. 2. The field core comprises a cup formed in a cup shape, and a lid attachable to an open end of the cup, wherein the cup is cut out from an outer periphery by a predetermined depth. 2. A part is formed, and a clutch mounting plate integrally formed on a coil bobbin of the electromagnetic coil is formed so as to be able to house the coil bobbin by projecting outward from the notch. Electromagnetic spring clutch. 3. The cup of the field core,
A second cutout portion cut out from the outer periphery by a predetermined depth is formed, and a power supply connection terminal box integrally formed on the coil bobbin of the electromagnetic coil projects outward from the second cutout portion. The electromagnetic spring clutch according to claim 1 or 2, wherein the coil bobbin is formed so as to be able to be stored therein.