JPH09222135A - Electromagnetic connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a waterproof effect and to prevent the damaging of the winding wire of an electromagnetic coil during assembling. SOLUTION: A holder 11 is provided with a housing groove 13 formed to have an annular shape deeper than the length of an electromagnetic coil 6 and the electromagnetic coil 6 is held between projections 11a provided in the inner circumferential surface of the housing grooves 13. An engaging end part 15 in the opening end part of the holder 11 is engaged with the engaging recessed part 16 of a cover 12, the opening fitting part 12a of the cover 12 is fitted in the opening part of the holder 11 and its opening surface is sealed. The holder 11 and the cover 12 are surely fixed and held in an annular groove 2b by caulking of a caulking projection 17 provided in the inner circumferential surface of the opening end part of a yoke 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic coupling device used, for example, in transmitting a driving force from an engine to a compressor of an air conditioner for a vehicle, and more particularly to improving an electromagnetic coil holding structure. Regarding things

[0002]

2. Description of the Related Art As an electromagnetic coupling device of this type, for example, as shown in Japanese Utility Model Publication No. 6-25715, a holder is provided to the extent that approximately half of the electromagnetic coil is exposed, and this holder is capped. A cover that covers the electromagnetic coil and stores the electromagnetic coil in the yoke to hold the electromagnetic coil used in the electromagnetic coupling device.

That is, in the electromagnetic coupling device disclosed in the above publication, the depth of the annular groove of the coil bobbin which is housed in the annular groove of the yoke and is formed in an annular shape having a U-shaped cross section is determined by the annular shape. When the electromagnetic coil is stored in the groove, the size is set so that approximately half of the electromagnetic coil is exposed.
The portion exposed from the coil bobbin is covered by a cover formed in an annular shape having a U-shaped cross section, and
The structure is such that the cover is press-fitted between the inner peripheral surface of the yoke and the peripheral surface of the electromagnetic coil to hold the electromagnetic coil in the yoke.

[0004]

However, the above conventional example has the following problems. First, the opening end of the coil bobbin and the opening end of the cover have a structure in which they are engaged with each other on the side surface of the electromagnetic coil. Since this part is located in the groove of the yoke, it is difficult to secure sufficient space. Because of this, this part is not waterproof and has low reliability with respect to water resistance. Also, since the opening end of the coil bobbin and the opening end of the cover are engaged on the side surface of the electromagnetic coil, when the two are engaged, the winding of the electromagnetic coil is sandwiched and the winding is scratched. There is a risk of turning on. Therefore, there is a problem in that careful attention is required during the assembling work, and the work efficiency is reduced.

Further, since the cover has such a size structure that it is press-fitted into the annular groove of the yoke, the electromagnetic coil is first housed in the coil bobbin during the assembling work, and in this state, the electromagnetic coil is inserted into the annular groove of the yoke. After the coil bobbin containing the electromagnetic coil is housed, the cover will be pressed into the annular groove of the yoke so as to cover the electromagnetic coil, resulting in a problem that the assembly work lacks simplicity and lowers the work efficiency. .

The present invention has been made in view of the above circumstances, and has a high waterproof property, does not damage the winding of the electromagnetic coil during the assembling work, and is easy to assemble. An electromagnetic coupling device having a holding structure is provided. Another object of the present invention is to provide an electromagnetic coupling device capable of accommodating a container accommodating an electromagnetic coil in an annular groove of a yoke without press-fitting.

[0007]

An electromagnetic coupling device according to the present invention is provided with a storage groove which is deeper than the length of the electromagnetic coil in the direction orthogonal to the radial direction of the annular electromagnetic coil. A holder, in which the electromagnetic coil is housed in a housing groove, and a cover, in which an engaging recess for engaging the opening end of the holder is formed, are housed in an annular groove formed in the yoke, and the yoke is formed. The inner peripheral surface of the opening end is partially caulked so that the holder and the cover are fixedly held in the annular groove of the yoke.

In such a structure, the electromagnetic coil is wholly housed in the housing groove of the holder, and the opening end of the holder is engaged with the engaging recess formed in the cover. The cover is closed on the opening side thereof. Therefore, unlike the conventional one in which the holder and the cover are engaged with each other on the side surface of the electromagnetic coil, when the cover is capped on the holder, it is avoided that the winding of the electromagnetic coil is sandwiched and damaged. The holder and the cover ensure the waterproofness.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The members, arrangements, and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.

First, a typical configuration example in which the electromagnetic coupling device according to the present invention is used in an air compressor used in a vehicle air conditioner will be described with reference to FIG.
An annular yoke 2 that constitutes the electromagnetic coupling device 1 is fixedly supported by the compressor body 4 via a plurality of support plates 5 screwed to one end surface side of the compressor body 4. The yoke 2 is formed with an annular groove 2b having a substantially U-shaped cross section on the side opposite to the compressor body 4, and the electromagnetic coil 6 is held in this portion by a holding structure described later. There is.

Further, on the compressor shaft 4a protruding from the compressor body 4, the rotor 3 is provided in the annular groove 3b formed on the yoke 2 side, and the annular portion 2a of the yoke 2 is spaced from the inner wall and the bottom of the annular groove 3a. It is fixed so that it is located through. The rotor 3 has a cylindrical tubular portion 2 in a central portion opposite to the side where the annular groove 3a is formed.
c is formed, and bearings 7a and 7b are mounted on the outer peripheral surface of the cylindrical portion 2c.

A V-pulley 8 is mounted via bearings 7a and 7b, and a V-belt (not shown) from an automobile engine (not shown) is stretched over the V-pulley 8 to extend from the automobile engine. The driving force is transmitted to the compressor shaft 4a as described later.

On the surface side of the V pulley 8 facing the rotor 3, leaf springs 9 are fixed at appropriate intervals in the circumferential direction, and an annular clutch is formed on the free end side of the leaf spring 9. When the ring 10 is fixed and the electromagnetic coil 6 is not excited, the clutch ring 10 faces the annular flat surface portion 3b of the rotor 3 with a gap. Therefore, in this state, even if the driving force is transmitted from the driving source such as the automobile engine via the V-belt (not shown), only the V-pulley 8 is rotated.

On the other hand, when the electromagnetic coil 6 is excited, the rotor 3 is magnetized, so that the clutch ring 10 is attracted to the flat surface portion 3b of the rotor 3 (see the thick arrow and the dotted line portion in FIG. 1), and the V pulley. As the rotor 3 rotates, the rotor 3 rotates, and therefore the compressor shaft 4
a is rotated. Then, when the electromagnetic coil 6 is de-excited, the attraction force of the clutch ring 10 by the rotor 3 disappears, so that the restoring force of the leaf spring 9 separates the clutch ring 10 from the rotor 3 and V
Only the pulley 8 is rotated, and the rotation of the compressor shaft 4a is stopped. It should be noted that details of the structure for holding the electromagnetic coil 6 in the annular groove 2b of the yoke 2 are omitted in FIG.

Next, the structure for holding the electromagnetic coil 6 will be described with reference to the partially enlarged sectional view of the yoke 2 shown in FIG. The electromagnetic coil 6 is housed in the annular groove 2b of the yoke 2 covered with the holder 11 and the cover 12, and is caulked at the opening end of the annular groove 2b. That is, the holder 11 is formed in an annular shape as a whole, and has an annular storage groove 13 in which the electromagnetic coil 6 is stored.

The depth of the storage groove 13 of the holder 11 is the length of the electromagnetic coil 6 (the length along the left-right direction of the paper surface in FIG. 2, in other words, orthogonal to the radial direction of the electromagnetic coil 6). (Length in the direction). Further, a plurality of protrusions 11a are formed on the two inner peripheral surfaces of the housing groove 13 at appropriate intervals in the circumferential direction, and when the electromagnetic coil 6 is housed in the housing groove 13. The electromagnetic coil 6 is sandwiched between the projections 11a provided on the opposing inner peripheral surfaces (see FIG. 2).

Further, the opening end of the holder 11 is provided with a notch 14 having a substantially L-shaped cross section (see FIG. 2) in the circumferential direction of the outer peripheral surface thereof to form an engaging end portion 15. The joint portion 15 is adapted to engage with an engagement recess 16 formed in the cover 12 as described later. The cover 12 is formed into a substantially annular plate shape as a whole, and the width of the opening fitting portion 12a (vertical direction in the drawing of FIG. 2) is set so as to match the width of the opening surface of the holder 11. The engaging end portion 1 of the holder 11 is set in the engaging concave portion 16 described below.
In the state in which 5 is engaged, the opening fitting portion 12a is fitted in the housing groove 13 to close the opening surface of the holder 11 and to be joined to the end surface of the electromagnetic coil 6.

At both end portions of the opening fitting portion 12a, portions slightly thicker than the plate thickness of the opening fitting portion 12a (thickness in the left-right direction of the paper in FIG. 2) are extended outward, respectively. An engagement recess 16 is formed in this portion. That is, when viewed in a cross section in the plate thickness direction (the left-right direction of the paper surface in FIG. 2), the engagement recess 16 has one inner wall surface of the engagement recess 16 along the plate thickness direction and the other inner wall surface. Has a so-called taper that is inclined from the opening surface side of the engagement concave portion 16 toward the bottom portion such that the distance from one inner wall surface is gradually reduced.

The thickness of the engaging end portion 15 (vertical direction in the plane of FIG. 2) and the opening width of the engaging recess 16 (vertical direction in the plane of FIG. 2) are substantially equal to each other. The engagement end 15 is locked in the engagement recess 16 by inserting the engagement end 15 of the holder 11 from the opening side of the engagement recess 16 to the extent that the joint end 15 bites into the engagement recess 16. As a result, the opening surface of the holder 11 is closed by the cover 12, whereby the electromagnetic coil 6
The waterproof property is secured. On the other hand, the yoke 2
A plurality of caulking protrusions 17 for caulking are provided in the circumferential direction on the inner peripheral surface in the vicinity of the opening end of the cover 12, and the peripheral edge portion of the cover 12 is caulked and fixed, as described later.

The procedure for assembling the electromagnetic coil 6 into the yoke 2 having the above structure will be described. First, the holder 1 will be described.
The electromagnetic coil 6 is housed in the housing groove 13 of No. 1, and the holder 11 is housed in the annular groove 2b of the yoke 2 in this state. Then
The engaging concave portion 16 of the cover 12 is provided with the engaging end portion 15 of the holder 11.
The cover 12 is put on the holder 11 by fitting the opening fitting portion 12a of the cover 12 into the opening portion of the holder 11 so that the holder 12 is inserted. Then, while pressing the cover 12, the caulking projection 17 provided at the opening end of the yoke 2 is caulked so that the peripheral edge portion of the cover 12 is fixed, so that the holder is placed in the annular groove 2b of the yoke 2. 11
The electromagnetic coil 6 covered with the cover 12 is fixed and held.

Next, a second embodiment will be described with reference to FIG. In this second embodiment, the holder 1
2 shows another example of the configuration of the engaging end portion 1 and the engaging concave portion of the cover 12. That is, in the second embodiment, contrary to the above-described first embodiment, the outer peripheral surface of the engaging end portion 15a is inclined and formed in a tapered shape, while the engaging concave portion 1 is formed.
6a is formed to have a U-shaped cross section, and the engaging end 1
5a is configured so that it can be inserted into the engagement recess 16a up to approximately the middle thereof.

Next, a third embodiment will be described with reference to FIG. In this third embodiment, the yoke 2
The positions of the holder 11 and the cover 12 in the annular groove 2b are opposite to those of the embodiment shown in FIG.
In the following description, the same components as those shown in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted. Hereinafter, different points will be mainly described.

In the third embodiment, the cover 12 is positioned at the bottom of the annular groove 2b of the yoke 2, and the bottom side of the holder 11 is positioned at the opening surface side of the yoke 2 so that the holder 12 is positioned at the bottom. The electromagnetic coil 6 covered with 11 and the cover 12 is fixed in the annular groove 2b of the yoke 2.

As a procedure of assembling, first, the yoke 2
The cover 12 is housed in the bottom of the annular groove 2b so that the engaging recess 16 of the cover 12 faces upward (on the opening surface side of the yoke 2). Next, the electromagnetic coil 6 is stored in the holder 11,
With the opening surface side of the holder 11 facing the opening surface side of the yoke 2, the holder 11 is inserted into the annular groove 2b of the yoke 2 so that the engaging end portion 15 of the holder 11 engages with the engaging concave portion of the cover 12. It fits in 16.

Then, by pressing the holder 11 from its bottom side, and by crimping the caulking projection 17 so that the peripheral portion of the holder 11 on the bottom side is fixed,
The electromagnetic coil 6 is fixed and held in the annular groove 2b of the yoke 2. It is needless to say that the engaging end portion 15 and the engaging recessed portion 16 may be configured as shown in FIG. 3 also in the third embodiment.

Next, a fourth embodiment will be described with reference to FIGS. The same components as those shown in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted. In the fourth embodiment, a connection terminal housing for housing a connection terminal 32 for connecting a lead wire 31 from the electromagnetic coil 6 and a lead wire 29 from the outside at an appropriate position on the bottom of the holder 11. The part 20 is provided.

That is, the projection wall 21 is provided in a rectangular shape at a proper position on the bottom surface of the holder 11 in the circumferential direction to form the connection terminal accommodating portion 20. A storage unit cover 22 having an opening surface and formed in a substantially rectangular parallelepiped shape is fitted. On the other hand, the corresponding portion of the yoke 2 has a fitting hole 2 through which the connection terminal housing 20 passes.
3 are formed. The lead wire 31 passed through the lead wire through hole 37 formed in the holder 11 has the lead wire 2 in the connection terminal housing portion 20 as described later.
It is designed to be connected with 9.

The inside of the connection terminal housing portion 20 is divided into two parts by a partition wall 24 (see FIG. 6).
4, a through hole 25 through which a part of a lead wire 29 for connecting the electromagnetic coil 6 to an external power source is formed is formed in a portion in the vicinity of the protruding wall 21 (see FIGS. 6 and 7). . The width of the through hole 25 is set so that the connection terminal 32, which will be described later, does not penetrate therethrough, and the portion of the lead wire 29 to which the sleeve 30 is not attached passes. 6 and FIG. 7).

Further, in each of the storage chambers 26a, 26b partitioned by the partition wall 24, locking projections 27a, 27b are provided so as to project from the projecting wall 21 at predetermined intervals (see FIG. 7). . Note that, in FIG. 7, only one locking protrusion 27a is shown. The locking protrusions 27a, 2
7b is formed by forming a slanting protrusion 28 on the tip of a slightly flat columnar member.
It is formed so as to gradually project outward as it goes downward from the tip (downward in FIG. 7).

The locking projection 27a is formed by the inclined projection 2
Between the portions other than 8 (the flat columnar portion) and the projecting wall 21, the connection terminals 32 to be described later are just housed, and the engaging protrusion 27b is the portion excluding the inclined protrusion portion 28. Between the (flat columnar portion) and the projecting wall 21, the lead wire 29 to which the sleeve 30 is attached is provided at such a position that it is just housed. This locking projection 2
7a and 27b are formed integrally with the holder 11 using a relatively elastic member such as a synthetic resin, so that the distance between the protruding wall 21 and the protruding wall 21 changes (the solid line in FIG. The entire structure is elastically deformable (see the dotted arrow).

In this structure, the lead wire 31 at the beginning (or end) of the electromagnetic coil 6 is wound.
Then, the connection with the lead wire 29 for connecting the electromagnetic coil 6 to an external power source (not shown) and the housing of the connection portion are performed as follows. First, the lead wire 31
And a lead wire 29 and a connection terminal 32 made of a conductive member.
Connect to each other by caulking. A sleeve 30 is attached to the tip of the lead wire 29 in advance.

Then, the connection terminal 32 is locked to the locking projection 2.
At the same time, the lead wire 29 is pressed downward against the inclined projection portion 28 of 7a, and at the same time, the portion of the lead wire 29 to which the sleeve 30 is attached is also pressed downward against the locking projection 27b inclined projection portion 28. As it goes down, the respective locking projections 27a and 27b are bent in the direction in which the space between the locking projections 27a and 27b is opened (the direction indicated by the solid line arrow in FIG. 7). At this time, the end surface of the connection terminal 32 on the side of the partition wall 24 is
The portion of the lead wire 29 to which the sleeve 30 is not attached is fitted into the through hole 25 while being brought into contact with.

Due to the bending of the locking projections 27a and 27b, the lead wire 29 to which the connection terminal 32 and the sleeve 30 are attached is attached.
Can easily pass between the top portion 28a of the inclined projection portion 28 and the protruding wall 21, respectively.
The locking protrusions 27 are provided below the inclined protrusions 28 of 7a and 27b.
It is fitted in a state of being sandwiched between the a and 27b and the projecting wall 21, and the locking projections 27a and 27b return to their original state due to their elastic force.

Therefore, the connection terminal 32 and the lead wire 2
The portions of the sleeve 9 to which the sleeve 30 is attached are locked by the tops 28a of the inclined projections 28, respectively.
Is prohibited from moving toward the front end (the direction from the back side to the front side in FIG. 6). Further, since the end surface of the connection terminal 32 on the lead wire 29 side is in contact with the partition wall 24, even if tension is generated from the lead wire 29 side, the tension acts only on the connection terminal 32 and the lead wire 31. The pull-out wire 3 is not affected by the external tension.
Therefore, the electromagnetic coil 6 is prevented from being damaged.

The portion of the lead wire 29 extending outside from the connection terminal accommodating portion 20 extends from the lead-out through hole 33 formed in the connection terminal accommodating portion 20 and the lead-out through hole 34 formed in the accommodating portion cover 22. It is designed to be pulled out (see FIG. 6). Further, the grounding connection wire 35 drawn out from the holder 11 is connected to a grounding terminal 36 fixed to the bottom surface of the yoke 2 with a screw or the like.

[0036]

As described above, according to the present invention,
The entire electromagnetic coil is housed in the housing groove of the holder, and the opening end of the holder is engaged with the cover at a position apart from the end surface of the housed electromagnetic coil on the holder opening side. Therefore, unlike the conventional one in which the holder and the cover are engaged on the side surface of the electromagnetic coil, it is possible to ensure high waterproofness for the electromagnetic coil housed in the holder, and moreover, the holder and the cover. Unlike the conventional case, there is a very low possibility that the winding of the electromagnetic coil will be sandwiched between the engaging portion of the holder and the cover when engaging with, and the electromagnetic coil will not be damaged during the assembly work, so that the reliability is high. An electromagnetic coupling device can be provided.

Further, unlike the conventional case, the holder and the cover are not press-fitted into the annular groove of the yoke, so that the holder and the cover can be assembled without trouble even if their dimensional tolerances are relatively rough. Further, unlike the conventional case, there is no press-fitting work, so that the assembling work is simplified and the work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part in a configuration example when an electromagnetic coupling device according to an embodiment of the present invention is used in an air compressor of a vehicle air conditioner.

FIG. 2 is a partially enlarged cross-sectional view of a yoke showing a structure for holding an electromagnetic coil in the electromagnetic coupling device according to the first embodiment.

FIG. 3 is a partial cross-sectional view showing a configuration example of an engaging protrusion and an engaging recess in the second embodiment.

FIG. 4 is a partially enlarged cross-sectional view of a yoke showing a holding structure for an electromagnetic coil according to a third embodiment.

FIG. 5 is a partially enlarged sectional view of a yoke showing a holding structure for an electromagnetic coil in an electromagnetic coupling device according to a fourth embodiment.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a partial perspective view around one locking projection in the fourth embodiment.

[Explanation of symbols]

 2 ... Yoke 2a ... Annular groove 3 ... Rotor 3a ... Annular groove 4 ... Compressor body 4a ... Compressor shaft 6 ... Electromagnetic coil 8 ... V pulley 9 ... Leaf spring 10 ... Clutch ring 11 ... Holder 12 ... Cover 12a ... Opening fitting part Reference numeral 13 ... Storage groove 15 ... Engagement end portion 16 ... Engagement concave portion 17 ... Caulking projection 20 ... Connection terminal storage portion 21 ... Sudden portion 22 ... Storage portion cover 24 ... Partition wall 25 ... Through holes 27a, 27b ... Locking Projection 28 ... Inclined projection 28a ... Top 30 ... Sleeve 35 ... Connection terminal

Claims (4)

[Claims] 1. A holder in which a storage groove deeper than the length of the electromagnetic coil in a direction orthogonal to the radial direction of the electromagnetic coil formed in an annular shape is formed, and the electromagnetic coil is stored in the storage groove. A cover formed with an engaging recess for engaging the opening end of the holder is housed in an annular groove formed in the yoke, and the inner peripheral surface of the opening end of the yoke is partially caulked. And the holder and the cover are fixedly held in the annular groove of the yoke. 2. The electromagnetic coupling device according to claim 1, wherein a plurality of protrusions are circumferentially formed on the inner peripheral surface of the housing groove of the holder so as to sandwich the electromagnetic coil. 3. The electromagnetic coupling device according to claim 1, wherein the cover has an opening fitting portion that fits into the opening of the holder. 4. A connection terminal accommodating portion for accommodating and holding a connection terminal connecting a winding of an electromagnetic coil and a lead wire from the outside is integrally formed at the bottom of the holder, and the lead of the connection terminal is formed. The electromagnetic coupling device according to claim 1, 2 or 3, wherein an end portion on the wire side is in contact with a partition wall formed in the connection terminal housing portion.