JPH0615141Y2 - Electromagnetic coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electromagnetic coupling device such as an electromagnetic clutch and an electromagnetic brake.

[Conventional technology]

Conventionally, of this type of electromagnetic coupling device, for example, the one shown in FIG. 2 has been adopted as an example of an electromagnetic clutch.
This will be outlined based on the figure. In the figure,
(1) is a driven shaft, (2) is a rotor fixed to this driven shaft (1) by a key (3), (4) is a lining provided on this rotor (2), (5) is the above A hub (6) loosely rotatably fitted to the driven shaft (1) is a gear formed on the outer periphery of the hub (5) and is rotated by a drive source (not shown).

(7) is an amateur facing the lining (4) through a gap (g) and supported by the hub (5) through a leaf spring (8) so as not to rotate relative to the lining (4). Is provided so as to be movable in the axial direction. (9) is an annular yoke rotatably supported by the rotor (2) through a metal (10), (9a) is an annular groove formed in the yoke (9), and (9b) is Draw-out hole penetrating to (9a), (11)
Is an annular exciting coil mounted in the groove (9a), and its magnetic flux is indicated by (Φ) in the figure. (12) is a bobbin around which the above-mentioned exciting coil is wound, and has a knurled part (12a) in the inner peripheral part, and this knurled part (12a) cannot move in the groove direction (9a) in the rotational direction and the axial direction. It is fixed to. (13) is a lead wire of the exciting coil, which is led out from the extraction hole (9a) and connected to a power source (not shown). (14) is the extraction hole (9a).
With the grommet attached to b), the lead wire (13) penetrates through the grommet (14).

Next, the operation will be described. When the exciting coil (11) is energized, a magnetic flux (φ) is generated to form a magnetic circuit, and the armature (7) is magnetically attracted to the rotor (2) against the elastic force of the leaf spring (8). . Therefore, the rotational force of the drive source (not shown) is
Driven shaft (1) via gear (6), hub (5), leaf spring (8), armature (7), lining (4), rotor (2) and key (3)
Transmitted to the driven shaft (1) to rotate. Also, when the exciting coil (11) is deenergized, the magnetic flux (φ) disappears,
Since (7) is separated from the rotor (2) by the elastic force of the plate ridge (8) and faces through the gap (g), the transmission path of the rotational force of the drive source (not shown) is cut off. , Lining
(4), rotor (2), key (3), and driven shaft (1) stop.

Here, when the rotor (2) rotates when the exciting coil (11) is energized, a slight rotational force acts on the yoke (9) via the metal (10). The yoke (9) is prevented from rotating by receiving pressure by (not shown).

[Problems to be solved by the device]

In the conventional electromagnetic coupling device as described above, the bobbin (12) and the yoke (9) are fixed by press-fitting into the groove portion (9a) of the knurl portion (12a), but the bobbin (12) is composed. Since it is made of resin, the size of the knurled part becomes large due to thermal expansion, moisture absorption, etc., and the press-fitting margin with the groove part (9a) becomes small. Therefore, the predetermined holding force of the bobbin (12) and the yoke (9) cannot be obtained, and the bobbin (12) can move in the axial direction and the rotation direction.
Interferes with (2). And due to the interference, the lead wire (1
3) was cut off, resulting in defective operation and lack of reliability.

Also, since the bobbin (12) is press-fitted into the yoke (9), it is difficult to align the lead-out hole (9b) with the lead wire (13) during press-fitting. ), The lead wire (13) was bitten in, and the coating of the lead wire (13) was peeled off, resulting in poor withstand voltage.

Further, since a press machine is required, workability is poor and productivity is low.

The present invention has been made to solve the above problems, and can securely hold the bobbin on the yoke.
It is an object of the present invention to obtain an electromagnetic coupling device which can prevent the lead wire from being caught in the lead-out hole and has high reliability and high productivity.

[Means for Solving the Problems]

The electromagnetic coupling device according to the present invention has a locking portion that is inserted into a hole that is communicated with the annular groove portion of the yoke and penetrates in the axial direction and that is locked to the bottom portion of the groove of the yoke in the axial direction. It is formed integrally with the bobbin.

[Action]

In this invention, since the bobbin is locked in the axial direction by the locking portion, the holding force is not lowered due to the expansion of the bobbin as in the conventional case, and the bobbin is completely fixed. Further, when the lead wire is passed through, the position of the yoke and the bobbin can be easily aligned, the workability is improved, the lead wire is not caught, and the withstand voltage defect is prevented. Further, since the bobbin can be assembled manually, the press machine as in the past is not required.

[Example of device]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, (12a) is a projection part which is inserted through the hole (9d) and is integrally formed with the bobbin (12).

(12b). (12c) are formed integrally with the bobbin (12) on both ends of the protrusion (12a) in the same manner as the protrusion, and the yoke (9)
The bottom (9c) of the groove (9a) of each is a locking part that is locked in the axial direction, and the locking part (12b) on the tip side is provided with a taper so that it can be inserted into the hole (9d). ing. The other structure is similar to that of the conventional device, and the description thereof is omitted.

In the structure as described above, the bobbin (12) and the engaging portions (12a). (12b). (12c) are integrally formed, and the yoke (9)
Since it is fixed by sandwiching the bottom part (9c) of the bobbin,
The holding force does not decrease due to the expansion of (12), and the yoke (9) and the bobbin (12) are securely fixed. Further, the bobbin can be assembled manually.

[Effect of device]

As described above, according to the present invention, the protrusions that are inserted into the through holes at the bottom of the yoke and the locking portions that are provided at both ends of the protrusions and that are axially locked to the bottom of the yoke are provided. ,
Since it is provided so as to be formed integrally with the bobbin, the bobbin and the yoke can be securely fixed, and the pressure resistance due to the lead wire being caught can be prevented, which is highly reliable, and the bobbin and the yoke can be easily inserted. Positioning is facilitated, and an electromagnetic coupling device with excellent productivity can be obtained.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an electromagnetic coupling device according to an embodiment of the present invention, and FIG. 2 is a partial sectional view showing a conventional device. In the figure, (2) is a rotor, (7) is an amateur, (9) is a yoke, (9a) is a groove, (9d) is a through hole, (9c) is a bottom, (11) is an exciting coil, (12). Is a bobbin, (12a) is a protrusion, (12b).
c) is a locking part, and (13) is a lead wire. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic coupling device including a yoke having an annular groove for accommodating a bobbin of an exciting coil, wherein a projection having an engaging portion integrally formed with the bobbin and a bottom of the groove of the yoke. A through hole is provided through which the protrusion is inserted, a lead wire is axially drawn from the bobbin, and an extraction hole is provided at the bottom of the groove of the yoke and through which the lead wire is inserted. Is inserted into the through hole to fix the bobbin in the axial direction and to perform relative alignment between the lead wire and the lead hole.