JP3302858B2 - Electromagnetic clutch shaft and electromagnetic clutch using the shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft for an electromagnetic clutch and an electromagnetic clutch using the shaft, and more particularly to a shaft for an electromagnetic clutch which can be reduced in cost and an electromagnetic clutch using the shaft.

[0002]

2. Description of the Related Art A conventional electromagnetic clutch is constructed as shown in FIG. The electromagnetic clutch shown in this figure is used for a paper feed mechanism of a copying machine, etc., and a shaft 23 is fitted in a field 22 consisting of a bottomed double cylindrical body having a cylindrical fitting portion 21 at the center. It is inserted and attached to the joint 21. In the field 22, a ring-shaped excitation coil 26 wound around a bobbin 24 made of an insulating material and having its outer periphery covered with an insulating sheet 25 is arranged.
Are attached to the rotor 28 and the armature 29. The armature 29 is connected to a driving force transmitting member 3 attached to the shaft 23 via a spring member 30.
1 is attached integrally. Locking ring grooves 32, 33 are formed at both ends of the shaft 23, and locking rings 34, 35 are fitted therein.

In order to make the rotation of the shaft 23 smooth, cylindrical bearings 36 and 37 made of synthetic resin or the like are interposed between the shaft 23 and both ends of the fitting portion 21 in the axial direction. .

In this configuration, at least the field 22, the shaft 23, the rotor 28, and the armature 29 are made of a magnetic material such as an iron-based material.
2. The shaft 23 and the rotor 28 constitute a magnetic path for generating a magnetic flux of the exciting coil 26.

[0005] In the electromagnetic clutch constructed as described above, when the exciting coil 26 is energized, the armature 29 is attracted by the attracting force generated on the rotor 28. As a result, since the rotor 28 is fixed to the shaft 23, the shaft 23 rotates according to the rotation of the driving force transmission member 31. When the power supply to the excitation coil 26 is cut off, the attracting force of the rotor 28 disappears, the armature 29 is separated from the rotor 28, and the rotation of the shaft 23 stops.

In the electromagnetic clutch constructed as described above, the cylindrical shaft 23 has a detent shape having a D-shaped cross section as shown in FIG. A shaft constituting a paper feed mechanism or the like whose outer diameter portion at the end has the same D-shaped cross section as the inner diameter portion is inserted into this portion, and the shaft 2 of the electromagnetic clutch is inserted.
3 is transmitted. Therefore, it is difficult to obtain the shaft 23 by cutting a metal bar due to the shape of the inner diameter portion. Therefore, the magnetic material powder is formed into a cylindrical shape such that the inner diameter portion at one end has a D-shaped cross section. The sintered body is sintered at a high temperature, and locking ring grooves 32 and 33 are formed on the outer periphery of both ends of the sintered body by cutting.

[0007]

However, if the electromagnetic clutch shaft 23 is made of a sintered body as described above,
A large number of steps such as a molding step and a firing step are required, and in addition, deformation occurs inevitably at the time of sintering due to deviation of material density at the time of molding. Therefore, there is a problem that it is difficult to reduce the cost of the shaft for the electromagnetic clutch. As a result, there is a problem that the cost of the electromagnetic clutch is restricted.

Accordingly, the present invention provides an electromagnetic clutch shaft having a configuration capable of reducing costs by simplifying the manufacturing process as compared with the above conventional one, and an electromagnetic clutch using the shaft. With the goal.

[0009]

In order to achieve the above object, a shaft for an electromagnetic clutch according to a first aspect of the present invention is made of a synthetic resin in which at least one end has a non-rotatable inner diameter. a cylindrical body made of, as a two-layer structure in tubular body made of a metal material having the cylinder and rotate together capable provided magnetic and with is positioned on the outer periphery of the cylindrical body, a metal material located in said outer periphery The magnetic path of the exciting coil in the electromagnetic clutch is constituted by a cylindrical body made of:

According to a second aspect of the present invention, there is provided an electromagnetic clutch shaft according to the first aspect, wherein a protrusion is provided on an outer periphery of a cylindrical body made of synthetic resin, and a metal disposed on the outer periphery of the cylindrical body is provided. A hole is provided in a cylindrical body made of a material, and the projection is fitted into the hole.

According to a third aspect of the present invention, there is provided an electromagnetic clutch shaft according to the first or second aspect,
The end portion of the cylindrical body made of a synthetic resin is protruded in the axial direction from the cylindrical body made of a metal material, and a locking ring groove is formed on the outer periphery of the protruded end portion.

The electromagnetic clutch according to claim 4 of the present invention.
The shaft for a switch according to claim 1 or 2,
Both ends of the cylindrical body made of synthetic resin are made of the metal material
Project from the cylinder in the axial direction, and
A locking ring groove is formed on the outer periphery of the end.
ing.

The electromagnetic clutch according to claim 5 of the present invention.
The shaft for a switch according to claim 1 or 2,
Both ends of a cylinder made of synthetic resin made of metal material
Projecting in the axial direction from the
A locking ring groove is formed on the outer periphery of the part, and a flange is formed on the other end.
It is characterized by having achieved.

Further, in the electromagnetic clutch according to a sixth aspect of the present invention, a cylindrical shaft is rotatably mounted on a field in which a ring-shaped excitation coil is disposed, and a rotor is fixed to the shaft in opposition to the excitation coil. An armature is rotatably mounted on the shaft in opposition to the rotor, and the armature is mounted on a driving force transmitting member rotatably mounted on the shaft via a spring member. In a magnetic flux generating device, the shaft according to any one of claims 1 to 5 is used as the cylindrical shaft.

[0015]

In the shaft for an electromagnetic clutch according to the first aspect, an inner diameter portion having a detent shape necessary for transmitting a rotation operation to a shaft constituting a paper feed mechanism or the like is formed of a cylindrical body made of synthetic resin. Since the portion constituting the magnetic path for passing the magnetic flux generated from the exciting coil is formed of a cylindrical body made of a magnetic metal material, it has exactly the same function as a conventional electromagnetic clutch shaft made of a sintered body. Will fulfill.

In the electromagnetic clutch shaft according to the second aspect, the inner cylindrical member made of synthetic resin and the outer cylindrical member are formed between the two members by a detent structure formed by fitting a projection and a hole. Since they cannot rotate with each other, they always function as a unit even though they are made of different materials, and perform exactly the same function as a conventional electromagnetic clutch shaft made of a sintered body. .

In the electromagnetic clutch shaft according to the third aspect, the locking ring groove is formed on the outer periphery of the end of the cylindrical body made of synthetic resin. Thus, the components of the electromagnetic clutch can be prevented from being detached from the shaft, so that the same function as the electromagnetic clutch shaft made of a conventional sintered body is performed.

According to a fourth aspect of the present invention, there is provided a shaft for an electromagnetic clutch.
On the outer periphery of both ends of the cylindrical body made of synthetic resin
The locking ring is formed here, so the locking ring
The components of the electromagnetic clutch are
Made of conventional sintered body
Performs exactly the same function as an electromagnetic clutch shaft
Will be.

According to a fifth aspect of the present invention, there is provided a shaft for an electromagnetic clutch.
The outer periphery of one end of the cylindrical body made of synthetic resin.
Since the locking ring groove is formed, the locking ring
The components of the electromagnetic clutch are
Not to leave the raft,
The other part of the collar also shuts down the components of the electromagnetic clutch.
Can be kept from the
Exactly the same as the electromagnetic clutch shaft consisting of the body
It will fulfill its function.

In the electromagnetic clutch according to claim 6 ,
Since the electromagnetic clutch shaft according to the first to fifth aspects performs exactly the same function as that of a conventional sintered body, the electromagnetic clutch maintains the same performance as the conventional one.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of an electromagnetic clutch shaft according to the present invention, and FIG. 2 is an external side view thereof. In these figures, an electromagnetic clutch shaft 1 is composed of a cylindrical body 2 made of a synthetic resin and a cylindrical body 3 arranged on the outer periphery and made of a magnetic metal material.

In the cylindrical body 2 made of synthetic resin, the inner diameter at the left end in the drawing has the same D-shaped cross section as the conventional one, and the remaining inner diameter has a circular cross section.
The cylindrical body 2 is formed so that both ends protrude in the axial direction from the cylindrical body 3 made of a metal material, and a projection 4 is formed at a position facing the outer cylindrical body 3. Locking ring grooves 5 and 6 are formed on the outer periphery of the boundary between the portion and the cylindrical body 3. In this embodiment, the protrusion 4 of the cylindrical body 2 has an inner diameter portion formed so as to extend over a boundary portion between a portion having a D-shaped cross section and a portion having a circular cross section. Stress can be relieved by the projections 4 and the strength of the cylindrical body 2 can be maintained.

The cylindrical body 3 made of a metal material has a hole 7 having the same size as the projection 4 at a position facing the projection 4 on the outer periphery of the cylindrical body 2. Is fitted into the hole 7 so that the cylindrical body 2 and the cylindrical body 3 cannot rotate with each other. This allows
Even if both are made of different materials, they always function as one, and the two-layer structure of the cylindrical body 2 and the cylindrical body 3 provides a required thickness to maintain a predetermined strength. Reliability is improved.

When the thickness of the metal material of the cylindrical body 3 is large, the hole 7 may be a not-penetrated concave portion as shown in the figure.

In the shaft 1 for an electromagnetic clutch constructed as described above, a cylinder 3 made of a metal material is arranged in an outer mold, and an inner mold is arranged in the cylinder 3, and the outer mold and the inner mold are arranged. It can be easily manufactured simply by pouring in a synthetic resin between them and curing.

The electromagnetic clutch shaft of the present invention configured as described above is used for transmitting a rotating operation to a shaft (for example, a rotating shaft of a sheet feeding roller) constituting a sheet feeding mechanism for performing intermittent feeding. An inner diameter portion having a necessary D-shaped cross section is formed by a cylindrical body 2 made of a synthetic resin, and a portion constituting a magnetic path for passing a magnetic flux generated from an exciting coil is formed by a cylindrical body 3 made of a magnetic metal material. Therefore, the same function as that of the conventional electromagnetic clutch shaft made of a sintered body is performed, but nevertheless, the use of inexpensive materials and the simplification of the manufacturing process are possible. Cost reduction can be easily achieved.

As the cylindrical body 3 made of a metal material, an existing metal tube may be used, or a metal plate such as a galvanized steel plate may be bent into a cylindrical shape, and the joint thereof may be engaged as shown in FIG. You may use what was made into the fitting shape and did not return by elastic force. The cylinder 3 shown in FIG. 3 will be described in more detail.
2 and 13, a large projection 15 corresponding to the pair of projections 12 and 13 is formed on the other joint 14, and a concave 16 for fitting the large projection 15 to one joint 11 is formed. Formed and the other joint 1
4 is a pair of recesses 1 in which small projections 12 and 13 are fitted.
7 and 18 are formed, and their projections and recesses are fitted to each other.

As shown in FIG. 4, the electromagnetic clutch shaft 1 has a locking ring groove formed only at one end thereof.
A large-diameter flange 19 may be formed on the cylindrical body 2 at the other end. In such a case, the flange 19 serves as a locking ring, and the number of locking rings required when assembling the electromagnetic clutch can be reduced.

Further, only one end of the cylindrical body 2 is projected from the cylindrical body 3 and the other end is covered with the cylindrical body 3, and the other end is locked. Ring groove for cylinder 3
May be formed on the outer periphery of the cylindrical body 2 or the cylindrical body 3 and the cylindrical body 3.
May be made the same length so that the entire cylindrical body 2 is covered with the cylindrical body 3, and locking ring grooves are formed on the outer periphery of both ends of the cylindrical body 3.

Further, the D-shaped cross section of the inner diameter portion of the cylindrical body 2 may be a triangle, a square, an ellipse or the like instead. In short, it is sufficient that the shaft has a detent shape for transmitting the rotation operation to the other shaft inserted here.
Further, the detent shape may extend not only at one end of the cylindrical body 2 but also over the entire area.

In addition, the protrusion 4 of the cylinder 2 and the hole 7 of the cylinder 3
Are formed by cutting the ring grooves 5 and 6 at both ends of the cylindrical body 2 with a lathe.
And the detent of the cylindrical body 3 is replaced with the fitting of the projection 4 and the hole 7,
It can optionally be performed with an adhesive.

FIG. 5 is a sectional view of an electromagnetic clutch according to the present invention constructed using the electromagnetic clutch shaft 1 shown in FIGS. 1 and 2 of the present invention, and has the same structure as the conventional electromagnetic clutch shown in FIG. Parts will be described with the same reference numerals. In this figure, a cylindrical fitting portion 21 is provided at the center.
The cylindrical shaft 1 is inserted into a fitting portion 21 and rotatably attached to a field 22 formed of a double cylindrical body with a bottom provided with a shaft. The shaft 1 includes a cylindrical body 2 made of the above-described synthetic resin and a cylindrical body 3 made of a magnetic metal material. In the field 22, a ring-shaped exciting coil 2 wound around a bobbin 24 made of an insulating material and having an outer periphery covered with an insulating sheet 25 is provided.
6 are fitted into the fitting portion 21 and arranged. A rotor 28 having a slit 27 at the bottom is fixedly mounted on the shaft 1 so as to face the exciting coil 26, and an armature 29 is rotatably mounted on the shaft 1 so as to face the rotor 28.

The armature 29 is integrally attached to a driving force transmitting member 31 such as a gear rotatably attached to the shaft 1 via a spring member 30 such as a ring-shaped leaf spring. In addition, locking rings 34, which are provided on locking ring grooves 5, 6 on the outer periphery of both ends of the shaft 1,
35 is fitted so that each component does not come off from the shaft 1. In the above configuration, at least the field 22, the rotor 28, and the armature 29 are made of a magnetic material such as an iron-based material.
The cylinder 3 of the shaft 1 and the rotor 28 constitute a magnetic path for generating a magnetic flux of the exciting coil 26. still,
Bearings 36 and 37 are interposed between both ends of the fitting portion 21 in the axial direction and the shaft 1.

In the electromagnetic clutch configured as described above, the driving force transmitting member 31 rotates about the shaft 1 by a driving source (not shown). Now, when the excitation coil 26 is energized, a magnetic flux is generated by the excitation coil 26 in a magnetic path formed through the field 22, the cylinder 3 of the shaft 1, and the rotor 28, and the rotor 28 Adsorption force is generated by the leakage magnetic flux. Therefore, the amateur 29 resists the elastic force of the spring member 30,
It is attracted to the rotor 28. As a result, the rotor 28 rotates together with the driving force transmitting member 31, and the shaft 1 rotates because the rotor 28 is fixed to the shaft 1.

On the other hand, when the energization to the exciting coil 26 is cut off, the magnetic flux disappears, so that the attracting force of the rotor 28 also disappears. As a result, the armature 29 is driven by the elastic force of the spring member 30 to the driving force transmitting member 31 side. And is separated from the rotor 28. Therefore, the rotation of the shaft 1 is stopped even if the driving force transmission member 31 is rotating.

Since the electromagnetic clutch of the present invention has exactly the same function as the conventional one as described above, the shaft 1 can maintain the same performance as the conventional electromagnetic clutch. Regardless, the cost can be reduced by at least the cost of the shaft 1. It goes without saying that the electromagnetic clutch of the present invention can be configured in the same manner as described above even if an electromagnetic clutch shaft of another embodiment other than those shown in FIGS. 1 and 2 is used.

[0038]

As described above, according to the first to fifth aspects of the present invention, the cylindrical body made of synthetic resin having at least one end having an inner diameter that is not detented, and the outer periphery of the cylindrical body are provided. And a cylindrical body made of a magnetic metal material provided in a rotatable manner with the cylindrical body so as to form a two-layer structure, and the exciting coil in the electromagnetic clutch is formed by the cylindrical body made of the metal material located on the outer periphery. Although the magnetic path of the present invention is constituted, the predetermined strength is maintained and the function is completely the same as that of the conventional electromagnetic clutch shaft made of a sintered body, but the cost can be easily reduced. This has the effect.

According to the second aspect of the present invention, a projection is provided on the outer periphery of the cylindrical body made of synthetic resin, and a hole is provided in the cylindrical body made of a metal material disposed on the outer circumference of the cylindrical body. The projections are fitted to each other so that they cannot rotate with each other, so that even if both are made of different materials, they always function as a single unit, and the reliability of the electromagnetic clutch shaft can be improved. It has the effect of being able to.

According to the third aspect of the present invention, the synthetic resin
The end of the cylindrical body made of metal
On the outer periphery of this protruding end for locking.
A ring groove is formed.
The components of the electromagnetic clutch are
It can be prevented from detaching from the shaft.

According to the fourth aspect of the present invention, a synthetic resin
Both ends of the cylindrical body are made of a metallic material.
In the direction of
A locking ring groove is formed so that the locking ring
The components of the electromagnetic clutch by fitting the ring
Articles can be prevented from detaching from the shaft.

According to the fifth aspect of the present invention, a synthetic resin
Both ends of the cylindrical body are made of a metallic material.
In the direction of
Form a locking ring groove around the circumference and form a flange at the other end
So that the locking ring fits into the locking ring groove
By making the components of the electromagnetic clutch
From the other end
Whether the components of the electromagnetic clutch are shafts depending on the collar of the part
Can be prevented from leaving.

According to the sixth aspect of the present invention, the electromagnetic clutch is constituted by using the electromagnetic clutch shaft according to any one of the first to fifth aspects, so that the same performance as the conventional electromagnetic clutch is maintained. In spite of this, there is an effect that the cost can be easily reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electromagnetic clutch shaft according to an embodiment of the present invention.

FIG. 2 is an external side view of the electromagnetic clutch shaft shown in FIG.

FIG. 3 is an external side view of a cylindrical body made of a metal material used for an electromagnetic clutch shaft of the present invention.

FIG. 4 is an external side view of an electromagnetic clutch shaft according to another embodiment of the present invention.

FIG. 5 is a sectional view of an electromagnetic clutch according to the embodiment of the present invention.

FIG. 6 is a sectional view of a conventional electromagnetic clutch.

FIG. 7 is a front sectional view of a conventional electromagnetic clutch shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft for electromagnetic clutches 2 Cylindrical body made of synthetic resin 3 Cylindrical body made of magnetic metal 4 Projection 5 Locking ring groove 6 Locking ring groove 7 Hole section 11 Joint section 12 Projection 13 Projection section 14 Joint section REFERENCE SIGNS LIST 15 projection 16 recess 17 recess 18 recess 19 flange 21 fitting portion 22 field 24 bobbin 25 insulating sheet 26 exciting coil 27 slit 28 rotor 29 amateur 30 spring member 31 driving force transmitting member 34 locking ring 35 locking ring 36 bearing 37 Bearing

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-288632 (JP, A) JP-A-7-208497 (JP, A) JP-A-6-235427 (JP, A) JP-A-6-235427 300047 (JP, A) JP-A 6-24239 (JP, U) JP-A 61-93638 (JP, U) JP-A 3-17431 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16D 27 / 10,27 / 14

Claims (6)

(57) [Claims] 1. A shaft for use in an electromagnetic clutch, a cylindrical body consisting of at least one end inside diameter portion detent shape as synthetic resin, the position of the outer periphery of the cylindrical body
The cylindrical body and the cylindrical body made of a magnetic material having magnetism provided in a rotatable manner have a two-layer structure. A shaft for an electromagnetic clutch, comprising a road. 2. A projection is provided on the outer periphery of the cylindrical body made of the synthetic resin, and a hole is provided in the cylindrical body made of the metal material arranged on the outer periphery of the cylinder, and the projection is fitted into the hole. The shaft for an electromagnetic clutch according to claim 1, wherein the shafts are combined. 3. An end portion of the cylindrical body made of the synthetic resin projects axially from the cylindrical body made of the metal material, and a locking ring groove is formed on an outer periphery of the projected end portion. 3. The shaft for an electromagnetic clutch according to claim 1, wherein: 4. Both ends of said cylindrical body made of synthetic resin are forward
So that it protrudes in the axial direction from the cylindrical body made of the metal material
And a locking ring groove is formed on the outer periphery of each protruding end.
3. The electromagnetic clutch according to claim 1, wherein
Shaft. 5. Both ends of said cylindrical body made of synthetic resin are forward.
So that it protrudes in the axial direction from the cylindrical body made of the metal material
A locking ring groove is formed on the outer periphery of this one end.
Wherein a collar is formed at the other end.
3. The electromagnetic clutch shaft according to 1 or 2. 6. A cylindrical shaft is rotatably mounted on a field in which a ring-shaped excitation coil is disposed, and a rotor is fixed to the shaft in opposition to the excitation coil, and an armature is fixed to the shaft in opposition to the rotor. The armature is rotatably mounted on the shaft, and the armature is mounted on a drive force transmitting member rotatably mounted on the shaft via a spring member so that a magnetic flux of the exciting coil is generated via the shaft. An electromagnetic clutch, wherein the shaft according to any one of claims 1 to 5 is used as the cylindrical shaft.