JPS58196329A - Electromagnetic coupling device - Google Patents

Abstract

PURPOSE:To automatically adjust a gap between a lining and an armature by spline-pressing a hub into a boss and making an axial moving load of the boss smaller than the attracting force of an excited coil. CONSTITUTION:When an adapter 5a is brought into contact with a retaining ring 8, the friction surfaces of a lining 4 and an armature 5 produces a gap for its worn portion. Since the attacting force of an excited coil 2 is larger than the pressing moving force of spline teeth 7b, 11a, a boss 7 is moved to the lining 4 by an adapter 5a of the armature 5 through the retaining 8. When the excited coil 2 is deenergized, the armature 5 is restored until the adapter 5a contacts a convex portion 7a by the elastic force of a leaf spring 6, so that a gap between the lining 4 and the armature 5 is set at (g).

Description

[Detailed Description of the Invention] This invention is a leaf spring-driven electromagnetic coupling device, in particular, which maintains a constant gap without adjusting the suction gap and can be used until the lining reaches IIN, and has a so-called automatic gap adjustment function. The present invention relates to an electromagnetic coupling device provided with the present invention.

In general, methods for transmitting driving force can be roughly divided into those using spline teeth and those using leaf springs. The former method, known as KFi, with an automatic gap adjustment device is generally adopted, and while it has the advantage of being usable with less maintenance, it requires a backlash of about 0.06 to 0.20 due to spline sliding. 1. This part may generate abnormal noise, and furthermore, there is a limit to the positioning accuracy, which limits its use. -The blade spring type Fi has no sliding parts, and its operation is stable, there is no cracking, and there is no abnormal noise, and the fixed position stop KFi fully demonstrates its characteristics. However, as the armature and lining are used, they become larger due to wear and tear, so their lifespan is short, and their use is limited to the distribution of snacks.In some cases, maintenance such as adjustment during use may be necessary. It required

This invention has been made in view of the above points, and one embodiment thereof will be described next. In the figure, (1) is an annular stator with a U-shaped cross section, (2) is an excitation coil built into it, (8) is a rotor, and (8&) is a stator for blocking magnetic flux. This four-taper (8)K provided slit, (4) is the lining, +51#-t this lining 0) and faces through the air 111g, and the leaf spring (6)K
armature supported and axially movable, (6a
) tj The adapter protruding from this amateur (5), (
7) is a boss, (7&) is a convex portion in contact with the adapter (5a)K, (7b) is a spline tooth, and (76) is a groove, into which a KFi retaining ring (8) is inserted. (9)
QOilt amateur T6) and leaf spring (6), leaf spring (
6) and a rivet for fixing the bus (7), ■ is a hub, and (l1m) is a spline tooth, which is inserted in a press-fit state with the spline tooth (7b) mentioned above. gf is the gap between the adapter (6&) and the retaining ring (8), and the gap g between the lining (4) and the armature [5] is set equal. The stator (1) is fixed to a mechanical fixing part (not shown), the P-ter is fixed to a drive shaft 1 (not shown), and the stator (1) is fixed to a driven shaft (also not shown).

Next, its operation will be explained. First, when the excitation coil (2) is not energized, the adapter (6 &) of the armature (5) is in contact with the protrusion (71) of the boss (7) due to the leaf spring (6), and the lining () and is via the air 611g, and there is no power transmission from w - fi (1) tP et al.

Next, when the excitation filter (2) is energized, a magnetic flux Φ is generated in the magnetic path indicated by the broken line in the figure. Therefore, the amateur [5] overcomes the elastic force of the leaf spring (6) and rotates the rotor (a) K Wk
Therefore, the rotor (j) is pulled by the drive shaft (not shown).
The rotational force transmitted to rotates a driven shaft (not shown) via the lining (4), the armature (5), the leaf spring (6), the boss (7), and the hub Ql. When the excitation coil (2) is deenergized again, the magnetic flux Φ disappears, and the armature + s
) Returns to the original position by the elastic force of the Fi plate spring (6) 〇 In the case of sewing the above operation, the suction force, the elastic force of the plate spring (6), the spline tooth (7k) (1 mm) It is designed in advance so that the following relationship is established between the thrust moving forces.

In the following relationship, the lining (4) and the armature (
If 5) is connected when it has relative rotation, it will eventually become completely connected although it will slip. During this slip, the friction surfaces wear against each other. Therefore, the gap gVi increases by the amount of wear. However, since K g' = g as described above, when the adapter (61) comes into contact with the retaining ring (8), the lining (
4) and the armature (5) will have a gap corresponding to the amount of wear. However, since the attraction force of the excitation coil (s) is greater than the press-fit movement force of the spline teeth (7b) (lla), the entire boss (1) is attached to the armature (5) via the retaining ring ($). adapter (6a
) Transfer from K to lining (4) @. Next, when the excitation filter (2) has to be deenergized, the armature [6] connects the convex 81S (7a) to the adapter (6&
) returns until it makes contact. Therefore, 11tjgK is set between the lining (4) and the armature z7 (5).

As described above, according to the present invention, it is possible to obtain stable operation for keeping the gap g constant, and the device can be used without maintenance until the lining 0 wears out. Further, since the leaf spring (6) also moves once together with the boss (7), a constant elastic force can be maintained at all times, resulting in a stable response. Further, according to the present invention, since the boss (7) is provided in the path of the armature [6], it can be made compact and can be easily attached to the mechanical device il. [Also, the adapter (6a) is provided integrally with the Amatenia [6],
If the retaining ring (8) for movement is inserted into the groove C7o')K using a spring material such as an O-shaped retaining ring, it can be manufactured at low cost.

Furthermore, could the hub O1) or the boss (7) be made of carbon fiber or the like? If made of RP material, spline teeth (7k) (
11m) also becomes good, and a stable Oma m5it adjustment mechanism is obtained. Since it becomes a non-magnetic material at the same time, leakage magnetic flux is reduced, the magnetomotive force of the exciting coil (2) works effectively, and stable performance can be obtained. Furthermore, the hub Qη
Even if iron material is used for the first boss (7), if the surface is subjected to soft nitriding treatment, poor strength will not be obtained and sliding properties will be improved.

As described above, according to the present invention, the boss and the armature are integrated into the leaf spring, and the boss and the hub are spline press-fitted into each other. It is no longer necessary to adjust the gap @g, and since the boss and hub are provided approximately at 111 within the armature, great effects such as compactness can be obtained.

[Brief explanation of drawings]

The figure is a partial sectional view showing one embodiment of the present invention. In the figure, (1) Fi stator, (2) excitation coil, (8)
is rotor, (4) is lining, (5) is amateur,
(5&) is the adapter, (6) is the leaf spring, (7) is the boss,
(Wb) (lla) is a spline tooth, (8) ti retaining ring, and a round hub. Agent Makoto Kuzuno - J ~ No 1 Distortion l / θ - 7c; Ja l

Claims (1)

[Scope of Claims] (1) A rotor, an armature facing the rotor through a gap in the axial direction, an excitation coil that presses the armature onto the rotor, a leaf spring that supports the armature, and a leaf spring to which the leaf spring is attached. In the boss and the hub provided on the inner periphery of the boss, the boss and the hub have irregularities such as spline teeth that can transmit torque to each other, and the irregularities are press-fitted into each other. An electromagnetic coupling device characterized in that the axial movement load is smaller than the attraction force of the excitation filter. (2) The electromagnetic coupling device according to claim 1, wherein the boss and the hub are located approximately on the inner circumference of the armature. (8) The electromagnetic coupling device according to claim 1, wherein at least one of the hubs and the hub is subjected to soft nitriding treatment. (4) The electromagnetic coupling device according to claim 1, wherein at least one of the boss and the hub is made of a composite material containing carbon fiber. (6) The electromagnetic coupling device according to claim 1, characterized in that an adapter for moving the boss is provided integrally with the armature in the cabinet of the armature. (6) The electromagnetic coupling device according to claim 1, wherein the retaining ring that moves the boss by coming into contact with the adapter of the armature is made of a O-shaped elastic material and is inserted into the groove of the boss.