192 clutches and power-stop control – Clutches – Operators
Patent
1989-07-25
1991-06-18
Herrmann, Allan D.
192 clutches and power-stop control
Clutches
Operators
192 81C, 192 90, F16D 2700
Patent
active
050243110
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
The present invention relates to an electromagnetic spring clutch.
BACKGROUND OF TECHNOLOGY
A conventional electromagnetic spring clutch is shown in FIG. 4.
A field core 400 is made of magnetizable material and formed in a bottomed cylinder. There is bored a throughhole 406 through which an axle 404 is inserted in the bottom section 402 of the field core 400.
An electromagnetic coil 408 is fixed in the field core 400 and fixed therein by suitable means such as caulking, adhering, etc.
An armature 410 is also made of magnetizable material and there is provided a flange 412 on the outer face thereof.
When the electric current passes the electromagnetic coil 408, then the armature 410 is attached to shift toward the electromagnetic coil 408. With the shift of the armature 410 in the axial direction thereof, the inner diameter of a coil spring, not shown, is reduced or increased to control whether torque is transmitted or not transmitted. Note that, the magnetic circuit is closed via the field core 400, the flange 412 of the armature 410 and the cylinder section of the armature 410 when the electric current passes through the electromagnetic coil 408.
DISCLOSURE OF THE INVENTION
However, the conventional electromagnetic spring clutch has the following disadvantages.
To form the field core in the bottomed cylindrical shape, drawing or cutting is required, so that machining work is troublesome and machining cost is increased.
Therefore, the object of the present invention is to provide an economical electromagnetic spring clutch whose field core can be formed easily and whose machining cost can be reduced. The electromagnetic spring clutch is characterized in that the field core is formed into U shape in section and an insert-section is opened through one or both of the vertical walls of the field core to pass therethrough axles, etc.
In the present invention, the field core is formed by an easy machining work, so that manufacturing efficiency of the electromagnetic spring clutch can be raised and economical ones can be provided.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an exploded view of a principal part of the electromagnetic clutch of the present invention;
FIG. 2 shows sectional views thereof in which (a) shows the state of no electric current passing through the electromagnetic coil and (b) shows the state of electric current passing therethrough;
FIG. 3 shows a perspective view of a field core of another embodiment; and
FIG. 4 shows an exploded view of a principal part of conventional electromagnetic spring clutch.
EMBODIMENTS
Preferred embodiments of the present invention will now be described in detail with reference to accompanying drawings.
First, an electromagnetic clutch is described in outline with reference to FIG. 1.
A field core 12 is made of such magnetizable material as iron, etc. Vertical walls 14 and 16 are vertically provided at each end of a connecting section 18. The field core 12 is formed into U shape by bending a rectangular iron plate. There are bored through-holes 20 and 22 in the vertical walls 14 and 16.
In an electromagnetic coil 24 a suitable amount of wire is wound to generate enough magnetic force.
Next, a detailed example is described with reference to FIGS. 2(a) and 2(b).
A field core 100 has vertical walls 102 and 104, bored through-holes 103 and 105 and a connecting section 106 connecting the vertical walls 102 and 104. An electromagnetic coil 108 is accommodated in the field core 100, and a suitable amount of wire is wound thereon to generate enough magnetic force.
An armature 110, which is a hollow round rod, is provided in the center hole of the electromagnetic coil 108. The armature 110 can be moved in the center hole 109 in the axial direction.
Torque from suitable drive means (not shown) is inputted to an input gear 114 which is provided at the end section of a master driving axle 112.
A slave driving axle 116 is inserted through the electromagnetic coil 108 and fixed to a driven axle 118 by a bolt 120. Note that, the master driv
REFERENCES:
patent: 3684068 (1972-08-01), Ford
patent: 4053858 (1977-10-01), Aidn et al.
patent: 4263995 (1981-04-01), Wahlstedt
patent: 4321992 (1982-03-01), Gallo
patent: 4443775 (1984-04-01), Fujitani et al.
patent: 4630722 (1986-12-01), Figueira et al.
patent: 4846324 (1989-07-01), Oshawa
The PSI Magnetic Spring Clutch (MSC), Warner Electric Brake & Clutch Co., copy 1973.
Herrmann Allan D.
Pitts Andrea
Tenryu Marusawa Kabushiki Kaisha
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