JPH0613387Y2 - Electromagnetic clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electromagnetic clutch for transmission of variable speed rotation incorporated in a machine tool, an industrial sewing machine or the like.

[Conventional technology]

Generally, in this type of device, an armature configured as a part of a magnetic flux circuit of an electromagnetic coil is arranged between a high-speed rotating member as an input rotating member and a low-speed rotating member, and the armature is used as an output rotating member in the axial direction. The structure is adopted so that it can be moved freely. Normally, the armature is frictionally connected to the high-speed rotating member by the pressing force of the drive spring, and the output rotating member and the high-speed rotating member are connected.However, by energizing the electromagnetic coil, the armature causes the magnetic attraction force of the electromagnetic coil. Thus, the output rotation member and the low speed rotation member are connected to each other by magnetically connecting to the low speed rotation member against the pressing force of the drive spring. An electromagnetic clutch having a structure in which one armature is selectively connected to two types of rotating members has already been proposed by the applicant of the present invention (Act.
-30145). This electromagnetic clutch has a built-in electromagnetic coil and a field core formed into an annular shape,
The field core and a shaft penetrating the shaft core of the field core are supported by the frame, and constitute a part of the magnetic circuit of the electromagnetic coil and are rotatably provided along the outer periphery of the field core. It is composed of one output pulley, an input pulley and a second output pulley which are rotatably provided on the shaft on the side opposite to the field core of the first output pulley via bearings. The input pulley is provided at a predetermined distance g from the first output pulley. The armature is magnetically coupled to the first output pulley when the electromagnetic coil is energized, and the coil spring provided on the input pulley. A movable body composed of a movable disk frictionally connected to the second output pulley by means of and a bolt that connects the armature and the movable disk and holds both sides of the input pulley is movable in the axial direction with respect to the input pulley. And to rotate integrally with the input pulley. Furthermore, in this electromagnetic clutch, a through hole is formed in the input pulley in parallel with the axial direction of the input pulley, and an armature and a movable disk are provided by a guide shaft inserted into the through hole through grease or an oil seal ring. It is connected to the input pulley in a non-crushing state.

[Problems to be solved by the invention]

However, in the conventional electromagnetic clutch constructed in this way, it must be attached by sequentially incorporating the respective constituent members into various machine devices such as a machine tool or an industrial sewing machine. It was difficult to adjust the distance g from the armature.

In addition, as a countermeasure against crushing, since the guide shaft of the movable body is fitted in the through hole of the input pulley, the structure becomes complicated and the productivity cannot be improved.

[Means for solving problems]

The electromagnetic clutch according to the present invention comprises a field core having a built-in electromagnetic coil, a case facing and fixed to the field core, a flange forming a magnetic circuit with the electromagnetic coil of the field core, and an outer side of a side portion of the field core. A first rotor rotatably provided on the field core via a bearing and having a cylindrical boss protruding to the power transmission member and a flange facing the flange of the first rotor; and the case. Second rotor rotatably provided in the case through a bearing on the same axis as the first rotor and projecting outward from the side of the first boss and connected to the power transmission member And a second rotor interposed between the first rotor and the second rotor, magnetically connected to the first rotor by the electromagnetic coil, and a spring by the spring. Armature is pressed is attached Te cowpea to the leaf spring, the one in which and a rotary shaft which is rotatably supported via a bearing through the hollow portion of the rotors the first rotor.

[Action]

By mounting the power transmission members on the cylindrical bosses and the rotary shafts of the first and second rotors of the assembled electromagnetic clutch, the electromagnetic clutch can be incorporated in various machines.

〔Example〕

Hereinafter, the configuration and the like will be described in detail with reference to the embodiments shown in the drawings.

FIG. 1 is a view showing a usage state of an electromagnetic clutch according to the present invention, and FIG. 2 is a side view showing an upper half portion of the electromagnetic clutch in a sectional view. In these drawings, reference numeral 1 is an electromagnetic clutch, 2 is a speed reducer, and the electromagnetic clutch 1 is fixed to the speed reducer 2 via bolts 3. A gear 4 is attached to a first rotor, which will be described later, and is connected to a motor shaft of a drive motor (not shown) via a gear 5. 6 is a pulley attached to a second rotor which will be described later.
Is connected to a motor shaft of a drive motor (not shown) via a belt 7. Reference numeral 8 denotes an input shaft of the speed reducer 2, which is connected to a rotary shaft described later. Reference numeral 9 denotes a field core having a built-in electromagnetic coil 10 and formed in an annular shape as a whole. Reference numeral 11 denotes a case opposed to the field core 9 and fixed by a bolt 12. The case 11 is made of a non-magnetic material. Is formed. Reference numeral 13 is a bearing for rotatably supporting a first rotor 14 which will be described later with respect to the field core 9, and is mounted on the inner peripheral portion of the field core 9.
14 constitutes a part of the magnetic circuit of the electromagnetic coil 10,
A first rotor for transmitting the rotation of an armature, which will be described later, to the gear 4. The first rotor 14 is provided with an arc-shaped slit 16 for bypassing the magnetic path 15 of the electromagnetic coil 10, and the electromagnetic coil 10 is formed. Flange 14a opposite to
And the whole is formed in a substantially cylindrical shape, one end of which protrudes outward from the side portion of the field core 9 and the outer peripheral portion of which is the bearing 1.
3 and a cylindrical boss 14b rotatably supported by the shaft 3, and is rotatably provided with respect to the field core 9. Further, a mounting screw hole 14c for fixing the gear 4 is provided at the protruding end of the first rotor 14. Reference numeral 17 denotes a second rotor for transmitting the rotation of an armature, which will be described later, to the pulley 6, and the second rotor 17 has a flange 17a facing the flange 14a of the first rotor 14 and a generally cylindrical shape. And a cylindrical boss 17b whose one end projects outward from the side portion of the case 11 and which is rotatably supported by a bearing 18 mounted on the case 11, the first rotor 14 It is provided rotatably with respect to the case 11 on the same axis. Also,
A friction plate 19 that comes into contact with an armature, which will be described later, is fitted to the first rotor 14 side of the flange 17a of the second rotor 17, and the pulley 6 is fixed to the protruding end of the cylindrical boss 17b. A mounting screw hole 17c is provided. Reference numeral 20 denotes an armature for transmitting the rotation of the first rotor 14 and the second rotor 17 to a rotary shaft 21 described later, and the armature 20 has a leaf spring 22 on the rotary shaft 21 and the first rotor 14 Flange at
It is mounted so as to be arranged between 14a and the flange 17a of the second rotor 17. The rotating shaft 21 has an enlarged diameter portion 21a formed substantially in the center in the axial direction, penetrates the cylindrical boss 14b of the first rotor 14 and the cylindrical boss 17b of the second rotor 17, and The rotor 14 is axially supported by bearings 23 and 24. A drive spring 25 for press-contacting the armature 20 with the second rotor 17 is elastically mounted on the enlarged diameter portion 21a of the rotary shaft 21, and the speed reducer 2 has an end portion on the second rotor 17 side. A slitted taper hole 21b for connecting the input shaft 8 is formed. In order to connect the input shaft 8 of the speed reducer 2 to the rotary shaft 21, first, a tapered member (not shown) provided with a rod that penetrates the hollow portion 21c of the rotary shaft 21 in the tapered hole 21b. ), And the input shaft 8 is fitted to the outer peripheral portion of the shaft end of the rotary shaft 21 in which the tapered hole 21b is formed. In this state, the rod of the tapered member is tightened on the opposite side of the rotary shaft 21 The tapered member can be press-fitted into the tapered hole 21b, and the shaft end portion of the rotary shaft 21 can be connected by expanding its diameter. Reference numeral 26 denotes a disc that protects the leaf spring 22 from being bent by a pressing force of the drive spring 20 when the electromagnetic clutch is assembled, and a lid 27 that closes the peephole 28 of the case 11,
Reference numeral 29 is a screw hole into which the bolt 3 is screwed, and reference numerals 30 and 31 are collars.

In an electromagnetic clutch constructed in this way,
The armature 20 is frictionally connected to the second rotor 17 by the pressing force of the drive spring 25, and the pulley 6 and the rotating shaft 21 are integrally rotated. By energizing the electromagnetic coil 10 from this state, the magnetic path 15 is formed, the armature 20 is magnetically coupled to the first rotor 14 against the pressing force of the drive spring 25, and the gear 4 and the rotary shaft 21 are connected. Rotate together.

[Effect of device]

As described above, the electromagnetic clutch according to the present invention is provided with a field core having a built-in electromagnetic coil, a case facing and fixed to the field core, a flange and a field core forming a magnetic circuit with the electromagnetic coil of the field core. A first rotor rotatably provided on the field core via a bearing, the first rotor having a cylindrical boss projecting outward from the side portion of the first rotor and connected to the power transmission member, and facing the flange of the first rotor. And a cylindrical boss projecting outward from a side portion of the case and connected to the power transmission member, and is rotatably provided on the case on the same axis as the first rotor via a bearing. The second rotor and the first rotor and the second rotor, and is magnetically connected to the first rotor by the electromagnetic coil and is connected to the spring. Then, the armature, which is brought into pressure contact with the second rotor, is attached by means of a leaf spring, and the armature is provided with a rotary shaft that penetrates through the hollow portions of the two rotors and is pivotally supported by the first rotor via bearings. Since the electromagnetic clutch can be incorporated in various machines by attaching the power transmission members to the cylindrical bosses and the rotary shafts of the first and second rotors of the clutch, respectively, the first rotor can be incorporated into various machines. It becomes unnecessary to adjust the distance between the armature and the armature, and the assembling work becomes easy. In addition, it is possible to prevent backlash between the armature and the rotary shaft by a very simple structure in which the armature and the rotary shaft are connected by a leaf spring.

[Brief description of drawings]

FIG. 1 is a diagram showing a state of use of the electromagnetic clutch according to the present invention, and FIG. 2 is a diagram showing a cross section of an upper half portion of the electromagnetic clutch. 1 ... Electromagnetic clutch, 4 ... Gear, 6 ... Pulley, 9 ...
... field core, 10 ... electromagnetic coil, 11 ... case, 13 ... bearing, 14 ... first rotor, 14a ... flange, 14b ... cylindrical boss, 17 ... second rotor, 1
7a …… flange, 17b …… cylindrical boss, 18 …… bearing,
20 ... Armature, 21 ... Rotating shaft, 22 ... Leaf spring, 23, 24 ... Bearing, 25 ... Drive spring.

Claims (1)

[Scope of utility model registration request] 1. A field core having a built-in electromagnetic coil,
A case fixed to face the field core, a flange that forms a magnetic circuit with the electromagnetic coil of the field core, and a cylindrical boss that projects outward from the side of the field core and is connected to a power transmission member, A first rotor rotatably provided on a field core via a bearing, and a cylindrical boss projecting outward from a flange facing the flange of the first rotor and a side portion of the case and connected to a power transmission member. A second rotor rotatably provided on the case via a bearing on the same axis as the first rotor, and interposed between the first and second rotors, An armature, which is magnetically connected to the first rotor by means of an electromagnetic coil and is pressed against the second rotor by means of a spring, is mounted by means of a leaf spring and is arranged in the hollow parts of the two rotors. Electromagnetic clutch, characterized in that a rotary shaft which is rotatably supported via a penetrating bearing to the first rotor.