JPS58131433A - Solenoid clutch - Google Patents

Abstract

PURPOSE:To aim at the promotion of lightness, by classifying a rotor into two parts, a structural body part functioning as a rotative driver and a part functioning as a magnetic circuit and a friction surface, while making up the former with a nonmagetic body small in specific gravity and the latter with a magnetic material respectively. CONSTITUTION:A rotor 1 supported rotatably on a loading machine 5 through bearing 4 is unifically molded together with a V-type groove body 2 as one body with a heating resisting material being small in specific gravity, for example, aluminum alloys, resins, etc., and a rotor magnet pole 12 composed of a magnetic body is to be installed on a surface opposite to an armature 8. In addition, the rotor magnetic pole 12 passes through the end face of the rotor 1 and is opposed to an iron core 13. The armature 8 is attached to a hub 7 of a load shaft 10 via a coil spring 9 as usually and then the periphery of this spring 9 is covered with a cover 11. According to the above construction, not only the promotion of lightness can be achieved but also magnetic characteristics and durability in a friction surface can be all improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic clutch, and an object of the present invention is to provide an electromagnetic clutch that reduces its weight and is suitable for being attached to portable equipment.

The structure of a conventional electromagnetic clutch is shown in FIGS. 1 and 2. In these figures, (1) is the rotor and the V-shaped groove body (2)
The load machine (5) is rotatably supported by a K bearing (4) and rotated by external power. p-
An electromagnet (6) is fixed to a load machine (5) in an annular groove (3) with a U-shaped cross section provided on one side of the machine (1).
) is housed, and the rotor (1) 0 annular groove (3) and the opposite IIO end face have a short time! Keep I and armature (
This armature (8) is connected to the hub ('r) in the load axis diagram via a coil spring or a leaf spring (9).
1, and the outer # of the spring (9) is the spring cover αB.
covered with. When the electromagnet (6) is energized, magnetic flux flows inside and outside the annular groove (3) with a U-shaped cross section of the rotor (1).
f.

It occurs in the magnetic path that passes through the cylindrical part, end face, and air gap to the armature (8) K, and is attracted to the rotor (1) by one electromagnet (6) K against the force of the armature (8) and spring (9). The rotational driving force of the rotor (1) is transmitted to the load axis diagram.

A conventional OTM clutch consists of an inner cylindrical part forming an annular groove (3) with a U-shaped cross section, which is supported by a bearing (4) of a rotor (1), an outer cylindrical part, and an armature air (8).
Since the end face facing the body serves both as a structure as a rotating body that transmits rotational driving force and as a magnetic circuit for an electromagnet, the entire structure is made of electromagnetic soft iron or low carbon steel, and the selection of materials used is severely restricted. , which is an impediment to weight reduction.

The present invention aims to improve the above-mentioned drawbacks by dividing the rotor (1) into a structural part that functions as a rotational drive body and a part that functions as a magnetic circuit and a friction surface. It is composed of the body, and only the superiors are composed of basic materials.

Fig. 1) shows a cross-sectional view of a main part of an embodiment of the present invention.

In this connection, the same parts as in FIG. 1 are given the same reference numerals. In Fig. 5, (1) is a rotor, which is rotatably supported by a bearing (4) at a load machine (5゛j). , for example, is integrally molded with aluminum alloy, resin, etc.
A rotor magnetic pole side made of a magnetic material is provided on the opposing surface of the armature (8)K. This rotor magnetic pole passes through the end face of the rotor (1) and faces the iron core 0 of the electromagnet (6). When the rotor (1) is made of resin or five-alloy aluminum, the inner surface of the ■-shaped groove body and the part in contact with the armature may be coated with a wear-resistant material.

Figure 4 shows the armature (8) and the opposing rotor (1).
Another example 1 of the present invention is shown in which magnetic poles 4 and q4 are provided on the end face of the double flux type. In both the embodiments shown in FIGS. 3 and 4, the tips of the rotor magnetic poles 4 and the electromagnet core 2 are made at acute angles to increase the opposing area.

Fig. 5 shows a case in which a lining (2) is provided on the frictional securing part of the rotor (1) in contact with the armature (8), and in this way, the friction coefficient can be selected to an arbitrary value q) from the lining QaK. This is what I did. Further, in this embodiment, the rotor magnetic pole (2) and the electromagnet core (O) are partially overlapped to increase the opposing area, thereby reducing magnetic resistance.

In the embodiments shown in FIGS. 3 to 5 above, the rotor (1) is made of resin, ceramic molding, or aluminum alloy casting.
Processed using methods such as forging. Figure 6 shows the rotor (1
) is made of a light alloy, and the rotor (1) is constructed by filling the inside thereof with a volume structure α7j made of a light 11 material or a foam molded body of a lightweight material.
2 is attached by fixing a magnetic pole piece made of sheet metal into the insert.

In this way, the rotor (1) is divided into a part that functions as a rotating structure and a part that functions as a magnetic circuit and a friction surface, and by constructing each of these parts from different materials, weight reduction is achieved, and By improving the magnetic properties and the durability of the friction surface, and by selecting the friction material, it is possible to obtain continuous slip type retention characteristics.

As described above, according to the present invention, the limitations on the materials used for the structure that also serves as a magnetic path, which were the inherent disadvantages of conventional electromagnetic clutches, are resolved, the selection of materials used is expanded, and the load conditions and service ratings can be adjusted. This provides the advantage of being able to create a design that is compatible with the design.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional electromagnetic spring clutch, Figure 2 is a sectional view of a conventional electromagnetic spring clutch.
The figure is a cross-sectional view of a conventional single-plate clutch, and FIG. 5 is a cross-sectional view of essential parts of an embodiment of an electromagnetic spring clutch according to the present invention.
4, 5, and 6 are sectional views of main parts of other embodiments of the present invention, respectively.
...Annular groove, (4)...Bearing, (5)...Load machine, (6)...Electromagnet, (7)...Nopu, (
8)...armature, (9)...spring, frame...
・Load shaft, mackerel, made of... rotor magnetic pole, (to)... electromagnetic core, (2)... lining, (to) - rotor skin body, Q7) -... volume structure. Agent O Name Patent Attorney Etsuji Yoshizaki Edition 1 Figure 2 Saba 2 Zuman 458 Crane 5rI! J simple diagram 6 b 1

Claims (1)

[Claims] A rotor that is rotated by external power, an armature that is provided opposite to one surface of the rotor and that is attached to a load shaft via an elastic body and is movable in the axial direction, and an electromagnet that is fixed to the load machine. In an electromagnetic clutch configured to energize an electromagnet, attract the armature to the rotor, and transmit rotor rotation to the load shaft, the rotor is made of a non-magnetic material with a small specific gravity, and the rotor is An electromagnetic clutch characterized by providing a magnetic path made of a magnetic material between an armature and an electromagnet.