JPH03265719A - Exciting evice for electromagnetic clutch - Google Patents

Abstract

PURPOSE:To eliminate a part projected from the side of an earth terminal and simplify the connecting method of an earth wire and the earth terminal by providing a cylindrical part to the earth terminal, and providing a terminal mounting pin-part and a loop-hole in a yoke member. CONSTITUTION:With the shape of a pin-part 15f provided to a main member 15 of a yoke, the diameter phi d2 of the straight part 15f of root is larger than the inside diameter phi D1 of the cylindrical part of an earth terminal, the tip of the pin-part is tapered, and the diameter phid1 of the end part of the tip is designed to be smaller than the inside diameter phiD1 of the cylindrical part. Further, the inside diameter phiD3 of the loop hole 17a of a yoke supporting member 17 is about the same in size as the outside diameter phi D2 of the cylindrical part 25c of the earth terminal. Then, the cylindrical part 25c of the earth terminal is pressed from the loop hole side into a terminal mounting part of a yoke member 18. Thus, the cylindrical part 25c, according to the shape of the pin-part 15f, is slowly enlarged, and the inside face of the cylindrical part 25c is brought into metallic contact with the pin-part 15f, and thus body-earth to the yoke member 18 is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to fixing a ground wire of an excitation device for an electromagnetic clutch.

[Conventional technology]

The method of body grounding the ground wire in conventional equipment is to provide a convex portion on a part of the back of the main yoke member or the yoke support member, as described in Japanese Utility Model Publication No. 58-32021 and Japanese Patent Publication No. 1-46731. After fitting the ground terminal with a ground wire connected to the convex portion, the convex portion is crimped to sandwich the ground terminal between the crimped portion and the yoke main member or the yoke support member. The ground wire was electrically connected to the yoke.

[Problem to be solved by the invention]

In the above conventional technology, after the ground terminal is fitted into the convex part provided on the back side of the yoke main member or the yoke support member, the convex part is crimped to fix the ground terminal. There was a problem that the ground terminal protruded from the side.

An object of the present invention is to provide a compact connection structure without a protruding part from the side surface of the ground terminal. Another object of the present invention is to provide a body ground connection structure that also simplifies the connection method between the ground wire and the ground terminal.

[Means to solve the problem]

In order to achieve the above purpose, a pin part is provided on the back side of the main yoke member, and a hole larger than the diameter of the pin part is provided in the part of the yoke support member opposite to the pin part, while the ground wire is A cylindrical part whose inner diameter is smaller than the outer diameter of the pin part and whose outer diameter is approximately the same as the diameter of the punched hole is formed on the surface of the connected ground terminal on the yoke side, and the cylindrical part is inserted into the punched hole. The earth terminal is press-fitted into the pin part from the hole side, expanded so that the outer diameter of the cylindrical part is larger than the inner diameter of the hole, and the earth terminal is body grounded to the yoke member.

[Function] As described above, in the present invention, the installation is completed by expanding the cylindrical portion of the earth terminal to which the earth wire is connected, which protrudes toward the yoke, using the pin portion provided on the yoke main member. Therefore,
Unlike the prior art, the caulking part does not protrude on the side opposite to the yoke of the earth terminal, and the body earth can be connected in a small size and with good workability.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a longitudinal sectional view of an electromagnetic clutch using the present invention, in which a hub 3 keyed to the end of a shaft 2 of a rotating machine 1, a part of which is shown, and a magnetic clutch connected to a drive source by a V-belt. an input rotating body 8 made of a material, a movable piece 5 made of a magnetic material disposed opposite to the input rotating body 8 in the axial direction with a gap therebetween, and the movable piece 5 coupled to the hub 3. It is composed of a leaf spring 4 for It includes an output rotary body 6 and an excitation device 10 for frictionally engaging the movable piece 5 and the input rotary body 8.

When the excitation coil 1 installed inside the excitation device 10 is energized, a main magnetic circuit A is formed as shown by the broken line in the figure, and the magnetic flux flowing along the main magnetic circuit A causes the movable piece to move. 5 is attracted to the input rotary body 8, and the opening force of the input rotary body 8 is transmitted to the output rotary body 1 by the frictional engagement force. Further, when the excitation coil 11 is de-energized, the movable piece 5 is separated from the input rotary body 8 due to the spring force of the leaf spring 4, and power transmission from the input rotary body 8 to the output rotary body 6 is canceled.

Next, the configuration of the excitation device 10, which is the part of the present invention, will be described. 15 is a main yoke member, which includes an outer flange 15a, an inner flange 15b, and a bottom plate portion 15 that connects both flanges.
An electromagnetic steel plate is pressed and formed into a ring shape with a U-shaped cross section. As shown in FIGS. 2 and 3, a take-out hole 15d for drawing out the lead wire 12 and the ground wire top 3 to the outside through the grommet 4 is formed in the bottom plate part 15c by press punching, and the main feature of the present invention is A pin portion 15f serving as a portion and a plurality of protrusions 15e for attaching the yoke support member 17 are integrally disposed on the yoke support member side by extrusion processing.

Reference numeral 17 denotes a support member for attaching the excitation device 10 to the rotating body 1 using a retaining ring, and the pin portion 15
A punched hole 417a facing the projection 15e and a rivet hole 17b having substantially the same diameter as the projection 15e are formed by pressing. Here, after fitting the rivet hole 17b of the yoke support member 17 into the protrusion 15e of the yoke main member 15, the end of the yoke 15e is crimped to complete the yoke member 18.

Next, the lead wire 12 is attached to the coil 11 which is wound into a ring in a separate process.
After attaching the ground terminal 13 and the grommet 14, insert the yoke into the main yoke member 15, pull out the lead wire 2 and the ground terminal 13 outward, and insert the insulating resin from the opening side of the yoke main member 15. 19 is injected, a hardening process is performed, and the excitation coil 11 is insulated and fixed to the yoke main member 15. Here, the ground terminal 25 connected to the ground wire 13 of the coil is connected to a substantially disc-shaped side plate portion 25a, a ground wire connection portion 25b provided on the outside of the side plate portion 25a, and a ground terminal 25 from the center of the side plate portion 25a. It has a cylindrical portion 25e that protrudes in the axial direction.

This ground terminal 25 is inserted into the hole 17a of the support member 17.
Then, the excitation device 10 of the present invention is completed.

Next, the mounting structure of the ground terminal 25 according to the present invention will be described in detail with reference to FIGS. 3 to 5.

First, the shape of the pin provided in the main yoke member 15 is such that the diameter φd2 of the trace portion 15g at the base is larger than the inner diameter φD1 of the cylindrical portion of the ground terminal 25, and the tip of the pin is tapered. It is provided so that φd1 is smaller than the inner diameter φD1 of the cylindrical portion. This shape is produced by pressurizing the outer periphery of the portion that will become the pin portion with a ring-shaped press die, and causing the material of the pressurized portion to plastically flow from the inner periphery of the press die toward the de-excitation coil side.

Furthermore, the inner diameter φD8 of the extraction hole 17a of the yoke support member F is approximately the same size as the outer diameter φD2 of the earth terminal cylindrical portion 25c, and the rivet hole 17b for attaching the yoke main member 15 is
At the same time, it is punched out using a press.

Furthermore, the ground terminal 25 has a ground wire connection portion 25b.
A ground wire 1, which is one end of the excitation coil 11, is attached to both sides of the yoke.
Connect 3 by caulking or soldering.

Then, the cylindrical portion 25c of the ground terminal 25 is press-fitted into the terminal attachment portion of the yoke member 18 from the hole side. As a result, the inner diameter φD1 of the cylindrical portion is gradually expanded following the shape of the pin portion 15f, and the outer diameter φD2′ of the cylindrical portion 25c at the outer periphery of the straight portion 15g of the pin portion 15f.
becomes larger than the inner diameter φD3 of the extraction hole 17a provided in the support member 17, and the means for preventing the earth terminal 25 from being removed is completed, and the inner surface of the cylindrical portion 25c and the pin portion 15f are securely brought into metal contact to form a yoke member. Body grounding to 18 is performed.

Next, other embodiments will be described using FIGS. 6 to 11. Note that the only difference between this embodiment and the previous embodiment is the method of connecting the ground wire and the shape of the ground terminal, so this part will be described in detail below, and the explanation of other parts will be omitted.

As shown in FIGS. 8 and 9, the ground terminal 25 of this embodiment does not have the ground wire connection part as in the previous embodiment, and the side plate part 25
An arcuate collar portion 25d with a height h slightly smaller than the wire diameter φdc of the ground wire 13 is attached to a part of the outer periphery of the earth wire 13.
, and radial uneven portions 25e are carved on both sides of the cylindrical portion of the side plate portion.

Next, as shown in FIG. 10.11, the ground terminal 25 is temporarily press-fitted into the pin part 15f of the main yoke member 15, and then the ground wire 13 is fitted along the outer periphery of the cylindrical part 25c.

Thereafter, the ground terminal 25 is press-fitted until the arc-shaped collar portion 25d abuts the back surface of the yoke support member 17, and as shown in FIG. 11, the body grounding of the ground [13 to the top 8 of the yoke member 8 is completed. That is, the uneven portion provided on the terminal 25,
Due to the action of 25e, a part of the enamel coating of the ground wire 13 is torn, and the cores 91, 3a come into metal contact with the ground terminal 25, and the body ground is connected from the ground terminal 25 to the yoke member side via the pin part 15f. will be carried out.

Note that the prevention of the disconnection of the ground terminal 25 is achieved by expanding the cylindrical portion 25c of the ground terminal 25 with the pin portion 15f in exactly the same manner as in the previous embodiment.

〔Effect of the invention〕

Since the present invention is configured as described above, the following effects can be obtained.

(1) Since the installation is completed by expanding the cylindrical part of the ground terminal with the pin part provided on the yoke member, the mounting part does not protrude to the side opposite to the yoke member of the ground terminal as in the conventional technology.
A compact mounting structure can be obtained.

(2) Also, when installing the ground terminal, the ground wire can be connected at the same time, and the process of connecting some of the ground wires to the ground terminal, which was done with conventional technology, can be omitted, greatly increasing productivity. improves.

[Brief explanation of drawings]

The first engineering drawing is a longitudinal sectional view of an electromagnetic clutch which is an embodiment of the present invention, FIG. 2 is a rear view of the main part of the excitation device in FIG. 1, and FIG. Figure 4 is a longitudinal sectional view of the ground terminal used in this embodiment, Figure 5 is a sectional view of the main part showing the shape of the terminal attachment member of the yoke member of this embodiment, and Figure 6 is an excitation diagram of another embodiment. The rear view of the main parts of the device, Figure 7 is the same as ■-■ in Figure 6.
8 is a vertical cross-sectional view of the ground terminal used in this example, FIG. 9 is a front view of the ground terminal shown in FIG. 8, and FIG. 10 is a cross-sectional view of the ground terminal shown in FIGS. FIG. 11 is a cross-sectional view of the main part showing the state temporarily assembled to the iron member, and FIG. 11 is a cross-sectional view of the main part showing the ground terminal completely press-fitted into the yoke member and the body grounding of the ground wire completed. 10... Excitation device, 11... Excitation coil, 13...
・Earth wire, 15... Yoke main member, 15f... Pin part, 17... Yoke support member, 17a... Hole extraction, 18...
...Yoke member, 25...Earth terminal, 25a...Side plate part, 25b...Earth wire connection part, 25c...Cylindrical part, 25d...Brim part, 11-2'sc

Claims (2)

[Claims] 1. In an excitation device for an electromagnetic clutch in which the earth side end (ground wire) of the excitation coil is body grounded to a yoke member,
A cylindrical part is formed in the ground terminal to which the ground wire is connected, a pin part with a diameter larger than the inner diameter of the cylindrical part is provided in the terminal attachment part of the yoke main member, and a support member attached to the back of the yoke main member is provided with a pin part having a diameter larger than the inner diameter of the cylindrical part. A hole having substantially the same outer diameter as the cylindrical portion is provided in a portion facing the pin portion, and after the cylindrical portion of the ground terminal is inserted through the hole, the pin portion is press-fitted into the inner periphery of the cylindrical portion. An excitation device for an electromagnetic clutch, characterized in that the outer diameter of the cylindrical portion on the yoke main member side is expanded to be larger than the diameter of the hole in the support member, and the ground terminal is fixed to the yoke member. 2. 2. An exciting device for an electromagnetic clutch according to claim 1, wherein the ground wire and the ground terminal are connected by crimping and clamping the ground wire between the ground terminal and the support member.