JPH02292524A - Exciter for electromagnetic clutch - Google Patents

Abstract

PURPOSE:To reduce the number of assembly works by arranging a hole into which a support provided on a coil winding bobbin side surface is inserted, at a position butting a lead wire draw-out hole at a main member side plate, and arranging so as to make positioning when an exciting coil has been assembled. CONSTITUTION:First, the power source lead wire 20 and the earth lead wire 20' of an exciting coil 11 which are inside furnished with a seal member 21 formed of, for example, such an elastic material as rubber or the like, and which are pressure-welded to male terminals 23, 23' that are put into female terminals 22, 22' and make a sure introduction, are inserted into the draw-out hole 13d of a yoke main member 13. After a coil-bobbin portion set 30 has been set so as to have terminals 22, 22' and the cores of terminals 23, 23' agreed upon, an assembly is done in a direction in which each terminal is put into the member 13. A plurality of pointed projections 15d are integrally provided on the side plate 13c side of the member 13, and a hole 13f into which the projection 15d is inserted on the side plate 13c, is arranged at a set position where terminals 23, 23' are put into terminals 22, 22', and the length of the projection 15d is made to be a length positioning the set 30 before respective terminals 22, 22', 23, 23' come into contact. As a result, connection and insertion can be done with precision.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an excitation device for an electromagnetic clutch, in which the exit portion of an excitation coil is connected to a lead wire for power supply and grounding of the excitation coil, and in the main member of the yoke of the excitation coil. Regarding storage assembly.

[Conventional technology]

As shown in Figures 1 and 3 of Japanese Utility Model Publication No. 2 Utility Model Publication No. 61-194832, the excitation coil outlet and the excitation coil power supply/ground lead wires are connected in advance to the excitation coil before storing it in the yoke. After the terminal is connected, the lead wire is drawn out from the lead wire draw-out hole in the yoke side plate, and the excitation coil is housed in the annular portion of the yoke main member, which is generally U-shaped in cross section.

[Problems to be Solved by the Invention] In the above-mentioned prior art, after the excitation coil drawing part and the excitation coil power supply lead wire are connected in advance, the lead wire extraction hole in the side plate of the annular part of the main yoke member is approximately U-shaped in cross section. In this process, the lead wire is pulled out from the de-excitation coil side end of the lead wire to the outside of the main yoke member, and the excitation coil is inserted into the annular portion of the main yoke member, which is approximately U-shaped in cross section. is built into the excitation coil, so threading the string through the hole had to be done manually, which was a major obstacle to reducing assembly man-hours and promoting automatic assembly.

The purpose of the present invention is to significantly reduce assembly man-hours and facilitate the promotion of automatic assembly, and further, to provide an inexpensive excitation device for an electromagnetic clutch that has performance equivalent to conventional products. .

[Means to solve the problem]

In order to achieve the above purpose, first, a female approximately fa rectangular terminal made of a conductor was made from a conductor on the side of the bobbin for winding the excitation coil, and two terminals, one for power supply and one for grounding, were integrally protruded from the bobbin using an insert injection molding method. Then, wrap both ends of the lead wire of the excitation coil around the terminal and fix it with solder, etc. to create an excitation coil assembly. Next, connect the excitation coil power supply/ground lead wire assembly (
One end is equipped with a male terminal that connects and fits into the approximately gourd-shaped terminal of the excitation coil set, and the other end is equipped with a terminal for connecting to the power supply lead wire for power supply, and a terminal for earthing for earthing. A sealing member made of an insulator is attached to the outer periphery of the terminal on the excitation coil group side to insulate the terminal and the yoke, and to isolate the inside and outside of the yoke. Temporarily assemble the excitation coil set into the lead wire draw-out hole in the side of the ring with a substantially U-shaped cross section, and insert the excitation coil set into the ring of the main yoke member with a substantially U-shaped cross section so that the roughly gourd-shaped terminal connects to the lead wire male terminal. It has a structure that can be inserted into.

Further, in the above-mentioned structure, the excitation coil set is first placed within the annular cross section of the main yoke member, and the approximately gourd-shaped terminal of the excitation coil is brought into contact with the lead wire extraction hole of the side plate of the main yoke member. The above object can also be achieved by incorporating the lead wire set into the yoke main member as shown in FIG.

Furthermore, in order to achieve positional accuracy in the direction of assembly of the excitation coil to the main yoke member, a pointed support is integrally provided on the side surface of the coil winding bobbin, and the support is inserted into the side plate of the main yoke member. The hole is placed at a position where the excitation coil terminal contacts the lead wire pull-out hole on the side plate of the yoke main member, and the position is determined when the excitation coil is assembled into the yoke main member, so the terminal on the lead wire side This ensures a secure connection with the

Finally, in order to improve connection workability and maintain continuity performance at the connection between the excitation coil terminal and lead wire terminal in the main yoke component, a roughly gourd-shaped female terminal is inserted into the bobbin and protrudes integrally with the bobbin. To improve connection workability, the opening side is expanded into a trumpet shape to facilitate insertion of the male terminal on the lead wire side, and is used as a guide when connecting the terminal. Omitted to maintain conductivity! A
The vertical cross-sectional shape of the rectangular terminal is as follows from the opening side: trumpet shape → smallest diameter part → largest diameter part → smallest diameter part →...
The shape changes smoothly in the order of , the minimum diameter part is smaller than the outer diameter of the male terminal on the lead wire side (slotted), and a press-fit fitting method is adopted, and the female terminal is attached to the male terminal at least 2 times. It is designed to make contact in several places.

Furthermore, the bobbin surface on the inner circumference of the terminal is bounded by the minimum diameter part so that the bobbin material does not flow into the inner circumference of the approximately gourd-shaped female terminal when integrally molding the insert into the bobbin.

[Effect]

To fix the lead wire of the excitation coil and the I[unt type female terminal, wrap the lead wire around the outer periphery of the terminal and then join with solder.The M's type female terminal and the lead wire pheasant terminal are fitted by press-fitting. Therefore, electricity flows into and out of the excitation coil from the power supply without fail.

In addition, positioning the power supply side and the ground side can be solved by arranging the terminals asymmetrically with respect to the lead wire extraction hole on the side plate of the main yoke member.

To avoid misalignment between the female terminal of the excitation coil and the male terminal of the lead wire when the excitation coil is assembled into the main yoke member, install the excitation coil into the main yoke member using a pointed post integrally protruding from the side of the bobbin. When assembling, both terminals can be properly fitted and connected by inserting and positioning both terminals into the guide holes of the side plates of the main yoke member before connection.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a longitudinal sectional view of an electromagnetic clutch using the present invention, in which a hub 3 connected to the shaft end of a shaft 2 of a rotating machine 1, a part of which is shown, and a hub 3 connected to a drive source by a V-belt (not shown). an input rotating body 8 made of a magnetic material;
a movable piece 5 made of a magnetic material disposed at a position facing each other in the axial direction; an output rotating body 6 comprising a leaf spring 4 for coupling the movable piece 5 to the hub 3; 5 and an excitation device 10 for frictionally engaging the input rotating body 8. When the excitation coil 11 installed inside the excitation device 10 is energized, a main magnetic circuit A as shown by the broken line in the figure is formed, and the magnetic flux flowing through the main magnetic circuit 8 causes the movable piece 5 to move toward the input rotating body. 8 and transmits the driving force of the input rotary body 8 to the output rotary body 6 by its frictional engagement force. In addition, when the excitation coil 11 is not energized, the plate/<
The movable piece 5 is separated from the input rotary body 8 by the spring force, and the driving force from the input rotary body 8 is cut off.

Next, the configuration of the excitation device 10 will be described.

13 is a main yoke member, which includes an outer flange 13a, an inner flange 13b, and a joint wall (side plate) that connects both flanges.
It is formed by integrally pressing electromagnetic steel material (magnetic material) into an annular shape having a substantially U-shaped cross section and consisting of 13C. The inner and outer flanges 13b and 13a of the main yoke member 13 have a shape that is easy to press by making the wall thickness on the side plate 13c side where a lot of magnetic flux flows thicker to reduce magnetic resistance, and making the tip part where there is less magnetic flux thinner. I have to. Note that the excitation coil 11 is mounted on the side plate 13c.
A pull-out hole 13d for pulling out the power supply side and ground side lead wires 20, 20' to the outside of the yoke main member 13, and a support member 14 for attaching the excitation device 10 to the rotating machine 1 are connected to the yoke main member 13. It is connected to the back of the side plate 13c by caulking,
The support column 13e used as a joint member between the yoke main member 13 and the support member 14 is attached to the side plate 13c when the yoke main member 13 is pressed. It is integrally protruded from the back.

FIG. 2 is an enlarged view of the invention part, and 15. is a bobbin,
It is molded from a resin such as nylon into an annular shape having a substantially U-shaped cross section, consisting of hollow disk-shaped side plate portions 15a and 15b and a cylindrical portion 15c connecting the inner peripheries of both side plate portions. The side plate 15b located on the side plate 13c side of the main yoke member 13 is fitted with the lead wire draw-out hole 13d of the main yoke member 13, and is connected to the lead wire ends 20 and 20' as shown in FIG. A female terminal 2 made of a conductor with a cross section lIuut shape that can be adopted.
2 and 22' are integrated into 1 using the insert method of resin injection molding.
It protrudes to the 3c side. In addition, the coil outlet wires 12, 12' are connected to the female terminals 22, 22' in the vicinity of the female terminals 22, 22', and the grooves 17, 17' are connected to the female terminals 22, 22'. The coil outlet wires 12 and 12' are provided diagonally in the direction of ' to make it easier to take them out.

Here, the openings fil2 and 12' are female terminals 22 and 22'.
'After wrapping around the concave part on the 15b side of the outer circumference. It is securely joined to the female terminals 22 and 22' using solder (not shown) or the like. The coil/bobbin assembly completed in this way is shown below. Next, the power supply/ground lead wires 20 and 2 of the excitation coil 11
0' and the method of connecting the coil/bobbin assembly 30 and the method of assembling both to the main yoke member 13 will be explained with reference to FIG. First, a sealing member 21 made of an elastic material such as rubber is installed inside the draw-in hole 13d of the main yoke member 13;
A male terminal 23 that fits into the female terminals 22 and 22' to ensure continuity.
・Power supply lead wire 2 of exciting coil 11 with 23' crimped
0 and the grounding lead wire 20'. ■Coil・
Connect the bobbin assembly 30 to the female terminals 22, 22' and the male terminals 23, 2.
3' are set so that their centers match, and then each terminal is assembled into the yoke main member 13 in the fitting direction. At this time, a plurality of pointed protrusions (posts) 15d are integrally provided on the side plate 13c side of the yoke main member 13 of the bobbin side plate 15b, and a hole 13f into which the pointed protrusions (posts) 15d are inserted is formed on the 13c side. The terminals 22, 22', 23, 23' are placed in a set position to fit together, and the length (height) of the protrusion 15d is adjusted before the terminals 22, 22', 23, 23' come into contact with each other. coil·
By setting the length of the bobbin assembly 30 to position it,
The connection and fitting of each terminal 22, 22', 23, 23' can be carried out with high precision. Moreover, if the plurality of protrusions 15d do not have the same diameter or are arranged asymmetrically, the coil
It is possible to prevent incorrect installation of the bobbin part and ifi30.

In addition, ■■ of the above assembly method is shown in FIG.
By changing the shape to 1', the assembly method is the reverse of . A more integrated method can also be used.

In addition, as shown in FIG. 3, approximately B-shaped female terminals 22, 22
' is press-formed from the opening side as follows: trumpet shape → minimum diameter part → maximum diameter part → minimum diameter part →...
The minimum diameter portion is smaller than the outer diameter of the lead wire side male terminals 23, 23', and has a press-fit fitting structure. In addition, the male terminals 23 and 23' are cut out at one point on the circumference,
Since the male terminals 23 and 23' are deformed within the elastic range of the material when inserted into the female terminals 22 and 22', each terminal 22
- 22', 23, and 23' have a structure with good workability and good conductivity. Furthermore, when the female terminals 22, 22' are integrally injection molded using the insert method, the bobbin surface inside the female terminals 22, 22' is bounded by the surface B of the smallest diameter part inside the female terminals 22, 22'. , it is possible to prevent the bobbin material from flowing into the inside of the terminals 22 and 22' (ensure continuity performance).

After assembling the yoke main member 13, the coil/bobbin assembly 30, and the lead wires 20, 20', the insulator 18 is inserted between the yoke main member 13 and the coil/bobbin assembly 30 in the same manner as in the prior art.
After being injected, a hardening process is performed to complete the excitation device 10 of the present invention.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

The process of pulling out the lead wires 20 and 20' is simplified compared to the structure in which the coil bobbin assembly 30 is assembled into the yoke main member l3, and the lead wires 20 and 20' are attached to the yoke main member l3 as shown in Fig. 4. By using the method of assembling the member 13 from the back side, there is no need to draw out the lead wires 20 and 20', so the number of man-hours is significantly reduced and the cost is reduced. Furthermore, the protrusion 15d provided on the bobbin side surface 15b improves assembly accuracy.
Automatic assembly can be achieved with low investment.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an electromagnetic clutch according to an embodiment of the present invention.
Figure 2 is an enlarged view of the lead wire extraction part of the excitation coil in Figure 1, Figure 3 is a diagram of the first method of assembling the coil output terminal and lead wire terminal part, and Figure 4 is the coil output part. FIG. 7 is a diagram of a second method of assembling the terminal and the lead wire terminal portion. 11... Excitation coil, 13... Yoke main member, 15...
...Bobbin, 20...Lead wire, 21...Seal member, 22nd l Problem/. 5b /5b rate Z 20or20' 75C

Claims (4)

[Claims] 1. An electromagnetic clutch has a yoke main member forming a part of the main magnetic circuit, an excitation coil serving as a source of magnetic flux, and an annular bobbin with an outward opening and a generally U-shaped cross section around which the excitation coil is wound. In the excitation device, the excitation coil power supply side
The ground side lead wire is integrally protruded from the side surface of the bobbin using an insert method, and is fixed to a female approximately gourd-shaped terminal made of a conductor, and the terminal is attached to the vertical wall of the annular portion of the main yoke member that is approximately U-shaped in cross section. Temporarily fix the male terminal provided at the end of the lead wire together with the lead wire in the hole for drawing out the lead wire for the excitation coil power supply/earth in the side plate (side plate). 1. An excitation device for an electromagnetic clutch, characterized in that a gourd-shaped terminal is configured to connect the excitation coil at the same time that the excitation coil is accommodated within the annular portion of the yoke main member having a substantially U-shaped cross section. 2. In claim 1, an excitation coil is housed in an annular portion having a substantially U-shaped cross section of the yoke main member, such that a gourd-shaped terminal of the excitation coil abuts a lead wire draw-out hole in a side plate of the yoke main member. Then, connect the excitation coil power supply/ground lead wire, which has a terminal and an insulator sealing member at the tip, to the gourd-shaped terminal from the outside of the yoke side plate, and at the same time connect the terminal to the gourd-shaped terminal. An excitation device for an electromagnetic clutch, characterized in that it is structured to be attached to a hole for drawing out a lead wire in a main member. 3. In claim 1, a tip-shaped support formed integrally with the bobbin on the side surface of the annular bobbin having a substantially U-shaped cross section is provided on the side plate of the yoke main member before the excitation coil is housed in the yoke main member. An excitation device for an electromagnetic clutch characterized by having a length that can be inserted into an existing through hole. 4. In claim 1, the vertical cross-sectional shape of the female approximately gourd-shaped terminal is such that the opening is widened in a lattice shape, and the opposite side to the opening is lattice-shaped from the opening side → the smallest diameter part → the largest diameter part →
The smallest diameter part has a smooth stepped shape in the order of...
An exciting device for an electromagnetic clutch characterized by having a structure in which the boundary between the insert and the bobbin has a minimum diameter.