JPH0619865Y2 - Electromagnetic clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an electromagnetic clutch applied to a drive system of an electrostatic copying machine or the like.

[Conventional technology]

Conventionally, an electromagnetic clutch has been used to selectively transmit a driving force of an input rotary element that is rotationally driven.
This type of electromagnetic clutch usually includes an armature, a rotor, and electromagnetic means for magnetically attracting the armature to the rotor. The electromagnetic means includes a field and a coil assembly mounted in the field. The electromagnetic means in such a conventional electromagnetic clutch will be described below with reference to FIG.

The illustrated conventional electromagnetic means 2 comprises a cylindrical field 4, a coil assembly 6 and a protective member 8. Field 4
Has an end wall 10, an inner wall 12 and an outer wall 14, one end surface of which is open. The outer side wall 14 is further formed with a hole 16 for guiding a connecting wire portion described later to the outside. The coil assembly 6 includes the bobbin 18 and the bobbin 1.
8 has a coil body (in FIG. 4, only the connecting wire portion 22 is shown because the coil body is covered with the seal member 20). Further, the protective member 8 has a sleeve-shaped main body 2 having an outer diameter slightly smaller toward the tip.
4 and a flange portion 26 provided at one end of the main body portion 24.

Then, the field 4, the coil assembly 6, and the protection member 8
Are assembled as follows to form the electromagnetic means 2. That is, the procedure for assembling the electromagnetic means 2 is as follows: (1) The coil assembly 6 in which the connecting wire portion 22 is connected to the coil body
Install in between.

(2) Next, the connecting wire portion 22 of the coil body is led out to the outside through the hole 16 formed in the outer wall 4.

(3) Next, the protective member 8 is attached to the connecting wire portion 22 led out from the outer wall 14, and then the protective member 8 is attached to the outer wall 1.
4 is press-fitted into the hole 16.

(4) After that, a connection terminal (not shown) is crimped to each of the free ends of the connection line portion 22.

(5) Next, or before the step (4), the coil assembly 6 is fixed to the field 4 by caulking a part of the inner wall 12 of the field 4.

Is.

In some cases, the protective member 8 is press-fitted into the hole 16 of the field 4 in advance, and then the connecting wire portion 22 is led out through the through hole formed in the protective member 8.

However, in the conventional electromagnetic clutch as described above, (a) although the field 4 is generally formed by sintering, it is difficult to form the hole 16 at one time during sintering. For this reason, since the holes 16 are formed by forming holes after molding, the number of manufacturing steps is increased. Further, it is relatively difficult to automate this hole forming process.

(B) Conventionally, there is a step of guiding the connecting wire portion 22 to the outside through the hole 16 of the outer wall 14 of the field 4, and it is difficult to automate such a step.

(C) Further, in relation to the description in (b) above, the coil assembly 6 is already mounted in the field 4 when crimping the connection terminal to the free end of the connection wire portion 22.
As a result, it is relatively difficult to automate the process of crimping the connection terminal to the connection wire portion 22.

There were inconveniences such as.

That is, in the conventional electromagnetic clutch, there are many manufacturing processes due to the structure of the electromagnetic means, and the automation of the assembly is relatively difficult, resulting in a high manufacturing cost.

[Purpose of device]

The present invention has been made based on the above facts, and its purpose is to significantly reduce the structure, easy to manufacture, low in cost, excellent in workability of assembly, and suitable for automation of assembly. To provide a clutch.

[Summary of Invention]

To achieve the above object, according to the present invention, a coil assembly having a tubular field having one open end, a bobbin mounted in the tubular field, and a coil body wound around the bobbin. And a protective member attached to the connecting portion of the coil body, and a mounting opening opened at the one end surface is formed in the outer wall of the field, and the side surfaces of the mounting opening are paired with each other. And a shoulder portion formed in a radially inner portion of the facing portion, each of the facing portion and the shoulder portion of the mounting opening being linear from the one end surface to the other end of the field. The protective member is provided to extend outward from the field through the mounting opening, and the protective member is provided on each of the shoulders so as to project outward from both end surfaces of the main body portion. From engaging projections that can be engaged The bobbin has a sleeve part around which the coil body is wound, and flange parts provided at both ends of the sleeve part. A positioning protrusion capable of engaging with the mounting opening is provided on the flange portion located on the one end surface side of the field, and the inner wall of the field or the sleeve portion of the bobbin of the coil assembly is provided with the positioning protrusion. An electromagnetic clutch is provided, which is provided with a fixing projection for fixing the bobbin.

[Preferred specific examples of the invention]

The electromagnetic means in the electromagnetic clutch constructed according to the present invention will be described in detail below with reference to the accompanying drawings.

1 to 3, the electromagnetic means 102 shown in FIG.
It comprises a cylindrical field 104, a coil assembly 106 and a protective member 108. The field 104 has a substantially circular end wall 110. A circular opening is formed at the center of the end wall 110, and a cylindrical outer wall 112 and an inner wall extending toward one end (right side in FIG. 2) are formed at the outer peripheral edge and the inner peripheral edge of the end wall 110. 114 is provided, and one end surface thereof is open. In the field 104, as clearly shown in FIG. 3, it is important to provide the outer wall 112 with a mounting opening 116 opened to the one end surface of the field 104.

The mounting opening 116 has a substantially rectangular shape and allows the field 10
End wall 1 from the opening existing on one end face of No. 4 toward the other end
It extends to the inner surface of 10 (FIGS. 2 and 3). The mounting opening 116 includes a shoulder 118. The shoulders 118 are respectively provided on a portion of the outer wall 112 of the field 104 that defines the mounting opening 116, and more specifically, on a radially inner portion of a facing portion 116a that defines a side surface of the mounting opening 116 (FIG. 1). And Fig. 3). As is clear from each figure, each of the facing portion 116a and the shoulder portion 118 of the mounting opening 116 is configured to linearly extend from one end surface of the field 104 to the other end (that is, a protection member described later). 108 extending in the mounting direction).

The outer peripheral surface of the inner wall 114 of the field 104 (the outer wall 11
On the surface (opposing the inner peripheral surface of 2), there is provided a fixing projection 120 that protrudes somewhat outward in the radial direction. Three fixing projections 120 (two shown in FIG. 3) are provided at intervals in the circumferential direction of the inner wall 114. Fixing protrusion 120
As shown in FIG. 3, it is preferable that the shape is such that the amount of protrusion outward in the radial direction gradually increases toward the mounting direction of the coil assembly 106 described later.

A sleeve-shaped bearing member 122 is fixed to the inner peripheral surface of the inner wall 114 of the field 104. Also the outer wall 1
The outer peripheral surface of 12 is provided with a locking projection 126 having a locking recess 124. The field 104 having the above-described structure can be easily integrally formed by sintering. Inner wall 1 of sinter-molded field 104
By press-fitting the bearing member 122 into the assembly 14, the assembly is assembled in the form shown in FIG.

The coil assembly 106 includes a bobbin 130 and a bobbin 130.
It includes a coil body 132 wound around. Bobbin 130
Has a hollow sleeve portion 134 and annular flange portions 136a and 136b provided at both ends of the sleeve portion 134, and is formed by integral molding of synthetic resin or ceramic. As shown in FIG. 2, the coil body 132 is wound around the outer peripheral surface of the sleeve portion 134 of the bobbin 130 and is located between the flange portions 136a and 136b. The coil body 132 wound around the bobbin 130 is further
It is covered with a band-shaped seal member 138, and only both ends thereof are led out from the seal member 138.

As will be described later, lead wires 140a and 140b constituting the connecting wire portion are connected to both ends of the coil body 132, and the lead wires 140a and 140b are connected to assemble the configuration shown in FIG. In the coil assembly 106 described above, the flange portions 136 a and 136
It is preferable to provide a positioning protrusion 142 that projects outward in the radial direction on at least one peripheral edge of b, and it is more preferable to provide the positioning protrusion 142 on the flange portion 136a as in a specific example.

The protection member 108 has a main body 144. Body 1
44 has a rectangular cross section, a through hole 146 penetrating in the axial direction is formed in the central portion thereof, and the engaging projections 14 projecting outward are formed on both end surfaces (both opposing surfaces) of the through hole 146.
8 are provided. The protection member 108 can be formed by, for example, integral molding of synthetic resin or ceramic.

Field 104, coil assembly 106 and protective member 1
08 is assembled in the form shown in FIGS. 1 and 2 by the following assembling procedure, for example.

That is, first, for example, a vinyl electric wire is cut into a predetermined length to form a pair of lead wires 140a and 140b.

Next, as shown in FIG. 1, the connection terminals 150a are respectively attached to the ends of the cut lead wires 140a and 140b.
And 150b are crimped. During this crimping, since nothing is connected to both ends of the lead wires 140a and 140b, the crimping of the connection terminals 150a and 150b can be performed easily and easily. As a result, the pressure bonding step can be easily automated.

Next, the other ends of the lead wires 140a and 140b are connected to both ends of the coil body 132 wound around the bobbin 106, respectively. As a result, the coil assembly 106 having the form shown in FIG. 3 is assembled.

Then, the lead wire 140a connected to the coil body 132
And 140b (constituting the connecting wire portion of the coil body 132)
Through the through hole 146 formed in the protective member 108, and the protective member 108 is connected to the lead wires 140a and 140b.
The other end of the.

Then, the protective member 108 is mounted in the mounting opening 116 formed in the field 104, and the coil assembly 106 is mounted in the field 104 as required. At the time of such mounting, in the protective member 108, the protective member 10 is provided on both sides of the one end of the field 104.
8 and the opening of the mounting opening 116 (opening on the one end surface of the field 104) are aligned with each other, and the engaging protrusion 148 of the protective member 108 and the mounting opening 116 of the field 104 are defined. Align the shoulders 118 provided.

In the coil assembly 106, the field 10
The bobbin 130 is positioned between the inner side wall 114 and the outer side wall 112 of the field 104 on the one end surface side of the No. 4 and the positioning protrusion 142 of the bobbin 130 is aligned with the shoulder 118 provided on the field 104. Then, the protective member 108 is inserted into the mounting opening 116 through the opening in the mounting direction, that is, leftward in FIG. 2, and at the same time, the bobbin 130 is mounted in the mounting direction.
That is, in FIG. 2, it is pressed into the field 104 leftward through the open one end face.

As described above, the main body 114 of the protective member 108 is assembled as shown in FIGS.
6 and through which it projects outwardly of the outer wall 112 of the field 104. As a result, the lead wire 140a
And 140b are reliably prevented from directly contacting the edge defining the mounting opening 116. Protective member 1
The engaging protrusions 148 of 08 come into contact with the shoulders 118, and are reliably prevented from coming off through the attachment openings 116 of the protective member 108.

Further, the fixing projection 120 provided on the inner wall 114 of the field 104 acts on the inner surface of the sleeve portion 134 of the bobbin 130, so that the bobbin 130, and thus the coil assembly 106, is reliably prevented from coming off. Conventionally, since the coil assembly is fixed by caulking a part of the inner wall of the field, a dedicated tool is required. However, this embodiment does not require a dedicated tool for press-fitting the coil assembly 106 into the field 104, which makes the assembly easier and simpler. The fixing protrusion 120 may be provided on the inner peripheral surface of the sleeve portion 134 of the bobbin 130 instead of being provided on the inner wall 114 of the field 104. Further, the coil assembly 1
In order to fix 06 more firmly, the fixing projection 120
At the same time, the bobbin 130 may be fixed with an adhesive.

When the coil assembly 106 is mounted, the positioning protrusion 142 provided on the flange portion 136a of the bobbin 130 is located on the shoulder portion 118 on the one end face side of the field 104. Therefore, the protection member 108
The attachment member 116 is surely prevented from coming off through the opening, and the protective member 108 is reliably attached to the attachment opening 116 in the state shown in FIGS. 1 and 2. The first
As can be easily understood from the drawings and FIG. 2, when the positioning protrusion 142 is provided on the flange portion 136a on the one end face side of the field 104, positioning when mounting the bobbin 130, specifically, Positioning on the shoulder 118 to prevent relative rotation of the bobbin 130 with respect to the field 104, and positioning to position the other ends of the lead wires 140a and 140b on the mounting opening 116, and the mounting opening 116 on the protective member 108. It works to prevent it from coming off from the opening. However, when it is provided on the other flange portion 136b on the other end surface side of the field 104, only the above-described positioning action is performed.

Electromagnetic means 10 assembled as shown in FIGS. 1 and 2.
2 is, for example, Japanese Patent Application No. 60-78 filed by the applicant.
It can be used in place of the electromagnetic means in the electromagnetic control spring clutch mechanism disclosed in the specification and drawings of No. 439 (name: electromagnetic control spring clutch mechanism). The details are omitted.

[Effect of device]

According to the electromagnetic clutch of the present invention described above, the following effects are achieved.

(1) With the protective member attached to the lead wire of the coil body, the protective member can be attached to the field through the opening of the mounting opening formed in the field. Therefore, it is possible to omit the step of leading out the connecting wire portion of the coil body to the outside on the outer wall side of the field and the step of press-fitting the protective member into the hole of the field, which are conventionally present.

As a result, the assembly itself is easy and simple due to the structure itself, and is also suitable for automation of assembly.

(2) The side surface of the mounting opening formed on the outer wall of the field is composed of a pair of opposing portions and shoulder portions formed respectively on radially inner portions of the opposing portions, and each of the opposing portion and the shoulder portion is formed. , Is linearly extended from one end surface of the field to the other end surface. That is, despite the presence of the mounting opening for mounting the protective member on the outer wall of the field, the structure thereof is remarkably simple as compared with the conventional one, so that the field can be integrally formed by sintering.

Therefore, the manufacturing of the field is significantly facilitated and the manufacturing cost is low.

(3) The side surface of the mounting opening formed in the outer wall of the field is composed of a pair of opposing portions and shoulder portions formed in the radially inner portion of the opposing portion, and each of the opposing portion and the shoulder portion is formed. It is configured to extend linearly from one end surface of the field to the other end. Further, the protection member is composed of a main body portion that can project to the outside of the field through the mounting opening, and an engagement protrusion that is provided to project outward from both surfaces of one end portion of the main body portion and that can engage with each of the shoulder portions. At the same time, it is attached to the mounting opening through the opening existing in the one end surface. That is, the structure of the mounting opening formed on the outer wall of the field and the protective member mounted on the mounting opening is significantly simpler than in the conventional case.

As a result, the manufacturing cost is low, and the mounting of the protective member in the mounting opening is extremely easy. Further, only by mounting the protective member in the mounting opening, it is possible to prevent the protective member from coming out in the radial direction.

(4) The bobbin has a sleeve portion around which the coil body is wound and flange portions provided at both ends of the sleeve portion. Further, a positioning protrusion capable of engaging with the mounting opening is provided on the flange portion located on the one end face side of the field. When the protective member is mounted in the mounting opening and the coil assembly is mounted in the field, the positioning projection engages the mounting opening and is positioned on the one end face side of the field of the protective member.

That is, by providing the positioning protrusion on the flange portion located on the one end face side of the field, the bobbin is prevented from rotating relative to the field, and the bobbin is removed from the opening of the mounting opening of the protective member (of the field of the protective member. It is also possible to prevent (detachment in one end face direction).

By providing the positioning protrusion on the flange portion located on the one end surface side of the field, it is possible to prevent the protective member from coming off the mounting opening.
This means that it is not necessary to provide a slip-out preventing means in the same direction between the protective member and the mounting opening.

As a result, the structure of the protective member and the mounting opening, which has been complicated in the past, can be significantly simplified. The simplification of the structure of the mounting opening greatly contributes to the achievement of the effect of facilitating the production described in (2) above.

(5) The inner wall of the field or the sleeve portion of the bobbin of the coil assembly is provided with a fixing protrusion for fixing the bobbin.

As a result, the bobbin, and thus the coil assembly, can be firmly mounted by simply press-fitting it into the field, and the coil assembly can be securely prevented from coming off. Conventionally, since the coil assembly is fixed by caulking a part of the inner wall of the field, a special tool is required to mount the coil assembly on the field. However, in the present invention, such a dedicated tool is not required, and the assembling thereof becomes easier and simpler, and the assembling work efficiency is further improved. Further, with the above-described structure, it is possible to use an adhesive together, and the coil assembly can be more firmly fixed to the field.

[Brief description of drawings]

FIG. 1 is a front view showing a partially cutaway electromagnetic means in an electromagnetic clutch constructed according to the present invention. FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is a perspective view showing the electromagnetic means of FIG. 1 in an exploded manner. FIG. 4 is an exploded perspective view showing an electromagnetic means in a conventional electromagnetic clutch. 2 and 102 ... Electromagnetic means 4 and 104 ... Fields 6 and 106 ... Coil assembly 8 and 108 ... Protective members 12 and 114 ... Inner side walls 14 and 112 ... Outer side walls 18 and 130 ... Bobbin 22 ... ... Connection wire portion 116 ... Mounting opening 118 ... Shoulder portion 132 ... Coil body 140a and 140b ... Lead wire 144 ... Main body portion 148 ... Engagement protrusion

Claims (1)

[Scope of utility model registration request] 1. A cylindrical field whose one end surface is open,
A coil assembly having a bobbin and a coil body wound on the bobbin and mounted in the tubular field; and a protective member mounted on a connecting portion of the coil body, the outer wall of the field being provided with Is formed with an open mounting opening at the one end surface, and a side surface of the mounting opening is composed of a pair of opposing portions and shoulder portions formed respectively on radially inner portions of the opposing portions. Each of the facing portion and the shoulder portion of the opening is configured to linearly extend from the one end surface of the field toward the other end, and the protection member can protrude to the outside of the field through the mounting opening. And an engaging projection that is provided so as to project outward from both surfaces of one end of the main body and can engage with each of the shoulders, and the mounting opening is provided through an opening that is present in the one end. Mounted on the bobbin A sleeve portion around which the coil body is wound, and flange portions provided at both ends of the sleeve portion, and the flange portion located on the one end face side of the field can be engaged with the mounting opening. An electromagnetic clutch, wherein a positioning projection is provided, and a fixing projection for fixing the bobbin is provided on an inner wall of the field or a sleeve portion of the bobbin of the coil assembly.