Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1982-12-15
1985-10-15
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335297, 192 84B, 192 84C, H01F 716
Patent
active
045477574
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electromagnetic used in solenoid clutches, etc., and provides an electromagnet which can be made small in size and light in weight and is easy to manufacture, wherein a storage space for the lead wire connections of a coil is defined in the thickness region of a yoke surrounding the coil.
BACKGROUND ART
As an example of prior art, an example of a dry, single plate, double-flux type solenoid clutch is shown in FIG. 1. In this figure, reference numeral 1 denotes a movable electromagnet section mounted on bearings 2 for rotation with respect to the housing 3 of a load rotary body (not shown), said section receiving external power through a V belt (not shown) entrained around a V groove 4 in the outer periphery thereof, whereby it is driven for rotation. A shaft 5 connected to the load rotary body is coaxial with said bearings 2, and a clutch hub 6 formed on one end of said shaft 5 is provided with a movable attraction plate 8 through an elastic body 7, said movable attraction plate 8 being held in opposed relation to one end surface of said movable electromagnet section 1 with a predetermined air gap 9a defined therebetween.
The movable electromagnet section 1 has its movable body 10 made of magnetic material in the form of an annulus of U-shaped cross section wherein its outer and inner cylindrical walls 10a and 10b are integrally connected by an end portion 10c opposed to said movable attraction plate 8, and an annular fixed electromagnet section 11 coaxial with said shaft 5 is inserted into the annular groove of the movable electromagnet section 1 from the open end side 1a thereof.
The fixed electromagnet section 11 comprises a yoke member 12 positioned on the open end side 1a of the movable electromagnet section 1, a coil winding box member 13, and a coil 14 wound inside said box member 13, the latter having a box outer sleeve 13a opposed to the outer cylindrical wall 10a of said movable electromagnet section 1 and a box inner sleeve 13b opposed to the inner cylindrical wall 10b, and being of U-shaped cross section turned in the direction opposite to the open end side 1a of the movable electromagnet section 1, wherein the outer peripheral side of the fixed electromagnet section 11 consisting of the outer peripheral end of the yoke member 12 and the box outer sleeve 13a and the inner peripheral side of the fixed electromagnet section 11 consisting of the inner peripheral end of the yoke member 12 and the box inner sleeve 13b are disposed with respect to the outer and inner cylindrical walls 10a and 10b of the movable electromagnet section 1 in such a manner as to maintain predetermined air gaps 9b and 9c, respectively, and a flange member 15 extending radially inwardly from the side of the yoke member 12 opposite coil 14 to the housing 3 to which it is fixed as by bolts.
Energizing the coil 14 of the fixed electromagnet section 11 produces magnetic flux in a magnetic path illustrated in FIG. 1 by the flux line indicated by reference FIG. 100, through the yoke member 12, movable body 10, movable attraction plate 8, and air gaps 9a, 9b, 9c between the yoke member 12 and movable body 10 and between the movable body 10 and movable attraction plate 8, thus attracting the movable attraction plate 8 to the friction surface of one end of the movable body 10, whereby the rotative force transmitted through the V belt is transmitted to the load rotary body through the shaft 5.
In the solenoid clutch of such construction, if said load rotary body is a compressor for a vehicle air conditioner, the requirement for reducing energy consumption makes it necessary to reduce the size and weight of the solenoid clutch.
Further, it is expected that the type of the compressor to be applied differs for different types of vehicles depending upon what position is assigned thereto relative to other parts in the engine compartment, incurring a limitation which makes it necessary to change the distance from the position of the V grooves 4 of the solenoid clutch to the front end
REFERENCES:
patent: 3995244 (1976-11-01), Sayo
patent: 4428470 (1984-01-01), Bennett et al.
Harris George
Matsushita Electric - Industrial Co., Ltd.
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