JPS646418Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an electromagnetic clutch in which a V-pulley made of thin steel plate and having a substantially W-shaped cross section is fixed to the outer peripheral surface of a rotor.

[Conventional technology]

Generally, a pulley made of thin steel plate is fixed to the rotor of an electromagnetic clutch. A representative example thereof is described in Japanese Utility Model Application Publication No. 51-89959. To briefly explain this using the cross-sectional view of only the upper half shown in FIG.
is fixed to a rotor 3 having an outer magnetic flux path portion 2 formed of a thin steel plate similar to that of the V-pulley 1. Further, a field core 4 is housed in the annular groove of the rotor 3.
The armature 6, which faces the friction surface of the rotor 3 with a predetermined gap, is magnetically attracted to the rotor 3 by the magnetic flux obtained by the electromagnetic coil 5 built into the rotor 3, and is hooked to the V-pulley 1 (not shown). This structure transmits the power transmitted to the rotor 3 via the belt to the armature 6 side.

[Problem that the invention attempts to solve]

In conventional electromagnetic clutches, the V-pulley 1 is fixed to the outer circumferential surface of the outer magnetic flux path section 2 of the rotor 3, so the outer magnetic flux path section 2 and the bottom of the V-pulley 1 are overlapped. There was a problem that the outer diameter became larger.

[Means for solving problems]

This invention aims to provide an electromagnetic clutch that is small and lightweight, and consists of a rotor with a substantially U-shaped cross section and a substantially W-shaped cross section fixed to the outer peripheral surface of the outer magnetic flux path portion of the rotor. In the electromagnetic clutch, the electromagnetic clutch is equipped with a V-pulley made of thin-walled steel plate and having a shape of approximately L-shaped in cross section, a cylindrical part, and a V-groove extending outward from one end of the cylindrical part. The outer magnetic flux path portion is made of a thin steel plate material and is made of a wall portion, and the cross section is approximately S-shaped made of a thin steel plate material that is made of a V groove portion and a V groove side wall portion that extends inward from one end of the V groove portion. a pulley portion having a shape of By fixing the end of the cylindrical part of the magnetic flux path part and further fixing either the outer magnetic flux path part or the pulley part to the inner magnetic flux path part, the outer peripheral surface of the outer magnetic flux path part has a cross section of approximately W. The present invention is characterized in that a V-pulley made of a thin steel plate is formed into a letter-shaped shape, and a rotor is formed into a substantially U-shaped cross section.

[Effect]

One V-groove portion of the thin-walled steel plate V-pulley having a substantially W-shaped cross section connects the V-groove one-side wall portion of the outer magnetic flux path portion, the V-groove one-side wall portion of the pulley portion, and these V-groove one-side wall portions. The other V groove part is formed by the cylindrical part of the outer magnetic flux path part, and the other V groove part is formed by the V groove part of the pulley part, which has a bottom having the same dimensions as the cylindrical part of the outer magnetic flux path part.
It is formed by a groove. Power is then transmitted to the rotor via belts hooked to these V-grooves.

〔Example〕

FIG. 1 is a longitudinal sectional side view showing an embodiment of the electromagnetic clutch according to this invention, in which a V-pulley 7 having a substantially W-shaped cross section has a bent portion 8, a V-groove side wall portion 9, and a cylindrical portion. An annular thin-walled steel plate having an outer magnetic flux path section 11 made of annular thin-walled steel plate consisting of 10, a V-groove side wall section 12, a V-groove section 13, and a bent section 14 having a substantially S-shaped cross section. Pulley part 1
5, the lowermost part of the V-groove side wall 12 of the pulley part 15 is fixed to the outer peripheral surface of the cylindrical part 10 of the outer magnetic flux path part 11, and the outer magnetic flux is fixed to the inner wall surface of the V-groove part 13 of the pulley part 15. Cylindrical part 1 of road part 11
0 ends are fixed and integrated.

In the V-pulley 7 having such a structure, the bent portion 8 of the outer magnetic flux path portion 11 is fixed to the outer circumferential surface of the inner magnetic flux path portion 17, which has a substantially L-shaped cross section with the front surface being a friction surface. At the same time, a rotor 16 is formed by these outer magnetic flux path portion 11 and inner magnetic flux path portion 17, and an annular groove having a substantially U-shaped cross section is formed in the rotor 16.

A field core 19 with a built-in electromagnetic coil 18 is housed in this annular groove, and the rotor 16 is supported by a bearing holder 20 to which the back surface of the field core 19 is fixed, allowing free rotation. ing.

Further, an armature 21 facing the friction surface of the rotor 16 with a predetermined gap therebetween is supported by an armature hub 23 via a leaf spring 22.

The electromagnetic clutch having such a configuration magnetically attracts the armature 21 to the rotor 16 by magnetic flux obtained by the electromagnetic coil 18, and attaches the armature 21 to the rotor 16 via a belt (not shown) hooked to the V-pulley 7. The power transmitted to the armature hub 23
transmitted to.

Note that in this embodiment, the outer magnetic flux path section 11
The bent portion 8 is fixed to the outer circumferential surface of the inner magnetic flux path portion 17 constituting the rotor 16, but the outer magnetic flux path portion 11
and the pulley part 15 are reversed, that is, replaced, and the bent part 14 of the pulley part 15 is connected to the inner magnetic flux path part 1.
It may be fixed to the outer peripheral surface of 7.

〔effect〕

As is clear from the above explanation, according to this invention, one V-groove portion of the thin-walled steel plate V-pulley having a substantially W-shaped cross section is connected to the V-groove side wall portion of the outer magnetic flux path portion and the pulley portion. The V-groove one side wall is formed by the cylindrical part of the outer magnetic flux path section that connects these V-groove one side wall parts, and the other V-groove has a bottom part with the same dimensions as the cylindrical part of the outer magnetic flux path part. Since the V-groove portion of the pulley portion is formed by the V-groove portion, the outer diameter of this type of electromagnetic clutch can be reduced by the fact that the bottom portion of one of the V-groove portions is also used as the cylindrical portion of the outer magnetic flux path portion.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the electromagnetic clutch according to this invention, and FIG. 2 is a sectional view of only the upper half of a conventional electromagnetic clutch. In the drawings, 7...V pulley, 9...V-groove one side wall part of the outer magnetic flux path section, 10...cylindrical part of the outer magnetic flux path section, 11...outer magnetic flux path section, 12...V groove of the pulley section One side wall part, 13...V groove part of pulley part,
15...A pulley portion having a substantially S-shaped cross section;
16... Rotor, 17... Inner magnetic flux path section.

Claims (1)

[Scope of utility model registration request] In an electromagnetic clutch comprising a rotor having a substantially U-shaped cross section, and a V-pulley made of thin steel plate having a substantially W-shaped cross section and fixed to the outer peripheral surface of the outer magnetic flux path portion of the rotor, the rotor has a substantially U-shaped cross section. an inner magnetic flux path section having a substantially L-shape; an outer magnetic flux path section made of a thin steel plate consisting of a cylindrical section and a V-groove side wall extending outward from one end of the cylindrical section; and a V-groove section. and a V-groove side wall extending inwardly from one end of the V-groove, and a pulley portion made of a thin steel plate and having a substantially S-shaped cross section; The lowermost part is fixed to the outer circumferential surface of the cylindrical part of the outer magnetic flux path part, and the end of the cylindrical part of the outer magnetic flux path part is fixed to the inner wall surface of the V groove part of the pulley part, and further, the outer magnetic flux path part Alternatively, by fixing either one of the pulley portions to the inner magnetic flux path portion, a thin-walled steel plate V pulley having a substantially W-shaped cross section on the outer circumferential surface of the outer magnetic flux path portion and a substantially U-shaped cross section. An electromagnetic clutch characterized in that a rotor is formed in a shape that exhibits.