JPH11236959A - Pulley for electromagnetic clutch and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulley for electromagnetic clutch capable of improving the working efficiency while realizing the ideal surface treatment without generating rust and while simplifying the surface treatment work and capable of lowering the cost, and to provide a manufacturing method thereof. SOLUTION: This device is formed of a cylindrical rotor main body 2 and a pulley main body 3 fixed to the periphery of the rotor main body 2, and the pulley main body 3 is formed of a large diameter cylindrical part 5 formed with a V-shaped groove 4 in the peripheral surface thereof and a small diameter cylindrical part 6 integrally formed with the large diameter cylindrical part 5. In a pulley 1 for electromagnetic clutch, in which the small diameter cylindrical part 6 of the pulley main body 3 is fitted for fixation to the periphery of the rotor main body 2, an annular connection part 7 for connecting the small diameter cylindrical part 6 and the large diameter cylindrical part 5 of the pulley main body 3 is provided with an air discharge hole 8 passing through the connection part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch which is a pulley comprising a cylindrical rotor main body and a pulley main body fixed to the outer peripheral surface of the rotor main body. The present invention relates to a pulley for an electromagnetic clutch used and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, this type of electromagnetic clutch pulley includes, for example, a cylindrical rotor main body having a core accommodating portion for accommodating a core, and a pulley main body fixed to the outer periphery of the rotor main body. The pulley body is composed of a large-diameter cylindrical portion having a belt hooking groove formed on the outer peripheral surface, and a small-diameter cylindrical portion integrated with the large-diameter cylindrical portion, and the small-diameter cylindrical portion of the pulley body is fitted on the outer periphery of the rotor main body. What is fixed by welding is known.

[0003]

The above-mentioned conventional pulley for an electromagnetic clutch is usually subjected to a surface treatment such as painting or plating after the above-mentioned welding process. When surface treatment is performed, air accumulates on the side of the connecting part connecting the small-diameter cylindrical part and the large-diameter cylindrical part of the pulley body, and an air pocket is formed, thereby creating a part without painting or plating. As a result, rust is generated in this portion. In order to prevent the generation of such rust, it is a troublesome and time-consuming operation to touch (paint) the paint with a brush or the like at the time of surface treatment, and the efficiency of the surface treatment work is poor. ,as a result,
There is a problem that the manufacturing cost is increased.

The present invention has been made in view of such conventional problems, and its object is to prevent the occurrence of air pockets at the time of surface treatment, thereby improving the reliability and ease of surface treatment. Another object of the present invention is to provide a pulley for an electromagnetic clutch and a method for manufacturing the pulley, the manufacturing of which is facilitated.

[0005]

Means for Solving the Problems To solve the above problems, the invention according to claim 1 comprises a cylindrical rotor main body and a pulley main body fixed to the outer periphery of the rotor main body. For an electromagnetic clutch consisting of a large-diameter cylindrical part with a belt hooking groove formed on the surface and a small-diameter cylindrical part integrated with the large-diameter cylindrical part, and the small-diameter cylindrical part of the pulley body is fitted and fixed to the outer periphery of the rotor body. At the pulley,
An annular vent connecting the small-diameter cylindrical portion and the large-diameter cylindrical portion of the pulley body is provided with an air vent hole penetrating the connecting portion.

With this configuration, one side surface and the other side surface of the connecting portion communicate with each other through the air vent hole. Therefore, when performing surface treatment such as painting or plating on the surfaces of the rotor body and the pulley body, All air generated during surface treatment and accumulated on one surface of the connection part (particularly the surface on the upper side during surface treatment), regardless of whether one side of the connection part or the other side faces downward, Since the air passes through the hole to the other surface, air does not accumulate on any surface of the connection portion, and no air pocket is formed. For this reason, it is possible to eliminate a portion where no painting or plating is applied, and it is not necessary to perform a troublesome and troublesome manual coating work as in the above-described conventional technology.

The invention according to claim 2 is a method of manufacturing an electromagnetic clutch pulley comprising a cylindrical rotor body and a pulley body fixed to the outer periphery of the rotor body. Forming a bottomed cylindrical body by pressing or pressing and rolling so that a small-diameter cylindrical portion can be on the bottom side and an outer peripheral surface can be a large-diameter cylindrical portion serving as a belt hooking portion on the opening side; The bottom of this bottomed cylindrical body is punched by press working, and after this punching, the small-diameter cylindrical part of the pulley body formed with a belt hanging groove on the outer peripheral surface of the large-diameter cylindrical part is fitted to the outer periphery of the cylindrical rotor body. In the manufacturing method of the electromagnetic clutch pulley to be fixed, before the step of forming the bottomed cylindrical body that becomes the pulley main body, at the stage of the plate-shaped pulley material, it is located between the two cylindrical parts in the step of forming the bottomed cylindrical body. Formed Characterized by drilling the pre-bleeding hole in the annular connection portion scheduled locations.

[0008] With this configuration, it is possible to easily manufacture a pulley for an electromagnetic clutch in which an air vent hole is provided at a connecting portion connecting the small-diameter cylindrical portion and the large-diameter cylindrical portion of the pulley body.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pulley for an electromagnetic clutch according to the present invention and a method for manufacturing the same will be described below with reference to the drawings. First, an example of an embodiment of a pulley for an electromagnetic clutch will be described with reference to FIGS. FIG. 2 is a view taken in the direction of the arrow A in FIG. The electromagnetic clutch pulley 1 is used for an electromagnetic clutch provided in a power transmission system of an automobile, an industrial machine, or the like. The pulley 1 has a core storage section for storing a core, and is provided with a power transmission system connected and disconnected by the electromagnetic clutch. A cylindrical rotor body 2 fixed to the drive shaft side or the driven shaft side, and a pulley body 3 fitted and fixed to the outer periphery of the rotor body 2
Consists of The pulley body 3 includes a large-diameter cylindrical portion 5 having a V-groove (belt groove portion) 4 formed on the outer peripheral surface, and a large-diameter cylindrical portion 5.
And a small-diameter cylindrical portion 6 integral with the cylindrical portion 5. The small-diameter cylindrical portion 6 of the pulley body 3 is fitted to the outer periphery of the rotor body 2 and fixed by welding or the like.

An annular connecting portion 7 connecting the large-diameter cylindrical portion 5 and the small-diameter cylindrical portion 6 has an air vent hole 8 penetrating the connecting portion 7.
Are drilled. Four air vent holes 8 are provided in the connection portion 7 at substantially equal intervals in the circumferential direction.

The number of air vent holes 8 is not limited to four, and the diameter of the air vent holes 8 is appropriately set according to the dimensions of the pulley body 3.

Next, an example of an embodiment of a method of manufacturing the above-described electromagnetic clutch pulley 1 will be described with reference to FIGS. FIGS. 3, 5, 7 and 9 are process diagrams showing one example.

First, a metal plate having a thickness that satisfies the required strength is prepared, and this metal plate is formed into a circular shape having a predetermined diameter by press working to obtain a plate-like pulley material 9. At a predetermined position of the circular plate-shaped pulley material 9, that is, when the plate-shaped pulley material 9 is positioned between a large-diameter cylindrical portion 5 and a small-diameter cylindrical portion 6 formed in a later step, Part 5 and small diameter cylindrical part 6
The four air vent holes 8 are formed by press working using a press die (press pierce die) 10 shown in FIG. (See FIG. 4). In this embodiment, the formation of the air vent hole 8 is performed simultaneously with the formation of the circular plate-shaped pulley material 9, but may be performed as a process after the formation of the plate-shaped pulley material 9. This press-formed product is shown in FIG. These four air vent holes 8 are formed at substantially predetermined intervals in the circumferential direction at predetermined positions of the annular connecting portion 7 of the pulley body 3.

Next, the circular pulley material 9 (FIG. 4) having the air vent hole 8 is squeezed by press working using a press die (press draw die) 11 shown in FIG. With the planned position of the connecting portion 7 in which the hole 8 is formed, the small-diameter cylindrical portion 6 is formed on the bottom 12 side, and the large-diameter cylindrical portion 5 whose outer peripheral surface is a belt hooking portion is formed on the opening side. A cylindrical body 13 is formed (see FIG. 6). Here, the inner diameter of the small-diameter cylindrical portion 6 is slightly larger than the outer diameter of the rotor main body 2 so that the inner peripheral surface of the small-diameter cylindrical portion 6 is fitted to the outer peripheral surface of the rotor main body 2. The large-diameter cylindrical portion 5 is wider than a pulley belt that is wound around the outer peripheral surface of the large-diameter cylindrical portion.

After the formation of the bottomed cylindrical body 13, the bottom 1
2 is punched out by press working using a press die (pulley bottom piercing die) 14 shown in FIG. 7 (see FIGS. 7 and 8). In FIG. 7, reference numeral 15 denotes a stamped bottom portion, and FIG. 8 shows a press-formed product 16 formed by the stamping process.

After the punching, the press-formed product 16 shown in FIG. 8 is clamped by the right and left clampers 17 and 18 while leaving the outer peripheral surface of the large-diameter cylindrical portion 5 to form a V-groove on the outer peripheral surface of the large-diameter cylindrical portion 5. The roller die 19 is pressed, and the roller die 19 and the clampers 17 and 18 are rotated to form a predetermined number of belt engaging grooves 4 on the outer peripheral surface of the large-diameter cylindrical portion 5 (see FIGS. 9 and 10). FIG. 10 shows the pulley body 3 formed with the belt hanging groove 4.

Next, the inner peripheral surface of the small diameter cylindrical portion 6 is fitted to the outer peripheral surface of the rotor body 2, and the small diameter cylindrical portion 6 is fixed to the outer periphery of the rotor body 2 by welding (see FIG. 1).

According to the electromagnetic clutch pulley 1 shown in FIG. 1 configured as described above, the connecting portion 7 is connected to the annular connecting portion 7 connecting the large-diameter cylindrical portion 5 and the small-diameter cylindrical portion 6. An air vent hole 8 penetrating therethrough is provided, so that one side surface (the upper surface in FIG. 1) and the other side surface (the lower surface in FIG. 1) of the connecting portion 7 pass through the air vent hole 8. Communicating. Therefore, when the surface of the electromagnetic clutch pulley-1 is subjected to a surface treatment such as painting or plating, air is blown through the air vent hole 8 regardless of which surface of the annular connection portion 7 faces downward.
Since air does not accumulate in the connection portion 7 and no air pocket is formed, it is possible to eliminate a portion that is not coated or plated, and it is not necessary to perform a troublesome and troublesome hand painting operation as in the above-described conventional technology. Therefore, it is possible to perform an ideal surface treatment that does not generate rust, simplify the surface treatment operation, improve the operation efficiency, and as a result, reduce the manufacturing cost.

Further, according to this embodiment, since four air vent holes 8 are provided in the annular connecting portion 7 at substantially equal intervals in the circumferential direction, the pulley -1 for the electromagnetic clutch is required for the surface treatment.
The air can be reliably removed from any of the air vent holes 8 even if the surface is inclined, and the surface treatment can be performed reliably.

Further, according to the present embodiment, the air vent hole 8 has the large hole diameter side facing downward (in the posture shown in FIG. 1).
In the case of performing the surface treatment, the air is easily released from the air vent hole 8, and the air can be more reliably extracted from the air vent hole 8.

Further, according to the method of manufacturing the electromagnetic clutch pulley described above, before the step of forming the bottomed cylindrical body 13 shown in FIG. That is, the plate-shaped pulley material 9 is formed between the large-diameter cylindrical portion 5 and the small-diameter cylindrical portion 6 formed in a later step, and is formed in an annular shape connecting the large-diameter cylindrical portion 5 and the small-diameter cylindrical portion 6. Since four air vent holes 8 are previously formed by press working at the positions where the connecting portions 7 to be formed are to be formed, the air vent holes 8 can be efficiently and easily formed, and the small diameter of the pulley body 3 can be reduced. The manufacturing of the electromagnetic clutch pulley-1 in which the air vent hole 8 is provided in the connecting portion 7 connecting the cylindrical portion 6 and the large diameter cylindrical portion 5 can be easily performed.

Further, according to the manufacturing method of the present embodiment, most of the above-described steps are performed by press working, so that the manufacturing cost can be reduced also in this respect. In addition,
In the manufacturing method of the present embodiment, the air bleed hole 8 is formed at a predetermined position of the circular pulley material 9 by press working. However, the present invention is not limited to this. A hole may be drilled at a location.

FIG. 11 shows another embodiment of the electromagnetic clutch pulley according to the present invention. In the pulley 1 for an electromagnetic clutch of the present embodiment, the small-diameter cylindrical portion 6 of the pulley body 3 fitted and fixed to the outer periphery of the rotor main body 2 has an annular connecting portion 7 at the center of the inner peripheral surface of the large-diameter cylindrical portion 5. And are integrally formed. The annular connection portion 7 is provided with four air vent holes 8 as in the above example.

An example of a method of manufacturing the electromagnetic clutch pulley 1 of this embodiment will be described. First, a metal plate is formed into a circular shape having a predetermined diameter by press working to form a plate-like pulley material. An annular portion connecting the large-diameter cylindrical portion 5 and the small-diameter cylindrical portion 6 at a location, that is, the plate-like pulley material is located between the large-diameter cylindrical portion 5 and the small-diameter cylindrical portion 6 formed in a later step. At the position where the connecting portion 7 is to be formed,
A plurality of air vent holes 8 are formed by press working.

Next, the plate-like pulley material having the air vent hole 8 formed therein is squeezed by press working, and a small-diameter cylindrical portion having a bottom is provided inside a predetermined position of the connecting portion 7 where the air vent hole 8 is formed. 6 is formed, and the bottom is punched out by press working.

Next, a roller die is pressed against the outer peripheral end surface of the plate-like pulley material having the small-diameter cylindrical portion 6 with a bottom inside the predetermined position of the connecting portion 7 while rotating the roller die so that the connecting portion 7 is pressed. Then, the large diameter cylindrical portion 5 serving as a belt hook portion is formed by expanding the contact portion in a T-shape. Then, a predetermined number of belt hanging grooves 4 are formed on the outer peripheral surface of the large-diameter cylindrical portion 5 to form a pulley main body 3.

Next, the inner peripheral surface of the small-diameter cylindrical portion 6 is fitted to the outer peripheral surface of the rotor body 2 and the small-diameter cylindrical portion 6 is fixed to the outer periphery of the rotor main body 2 by welding, so that the electromagnetic clutch pulley 1 is formed. Complete.

[0028]

As described above, according to the present invention, the occurrence of air pockets at the time of surface treatment can be prevented, so that the reliability and easiness of the surface treatment can be improved, and furthermore, the production is simplified. It is easy and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of an embodiment of a pulley for an electromagnetic clutch according to the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a process diagram showing an example of an embodiment of a method of manufacturing a pulley for an electromagnetic clutch according to the present invention.

FIG. 4 is a plan view showing a press-formed product formed in the step of FIG. 3;

FIG. 5 is a process diagram showing an example of an embodiment of a method for manufacturing a pulley for an electromagnetic clutch according to the present invention.

FIG. 6 is a vertical sectional view showing a press-formed product formed in the step of FIG. 5;

FIG. 7 is a process chart showing an example of an embodiment of a method for manufacturing a pulley for an electromagnetic clutch according to the present invention.

FIG. 8 is a longitudinal sectional view showing a press-formed product formed in the step of FIG. 7;

FIG. 9 is a process chart showing an example of an embodiment of a method of manufacturing a pulley for an electromagnetic clutch according to the present invention.

FIG. 10 is a longitudinal sectional view showing a pulley main body formed in the step of FIG. 9;

FIG. 11 is a longitudinal sectional view showing another example of the embodiment of the pulley for an electromagnetic clutch according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pulley for electromagnetic clutches 2 Rotor main body 3 Pulley main body 4 V-groove (belt groove part) 5 Large-diameter cylindrical part 6 Small-diameter cylindrical part 7 Connection part 8 Air vent 9 Pulley material 10, 11, 14 Press die 12 Bottom part 13 Bottom cylindrical body 15 Stamped bottom 16 Press-formed product 17,18 Clamp 19 V-groove forming roller die (roller die)

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[Procedure amendment]

[Submission date] April 19, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

The invention according to claim 2 is a method of manufacturing an electromagnetic clutch pulley comprising a cylindrical rotor body and a pulley body fixed to the outer periphery of the rotor body. as the small-diameter cylindrical portion can be on the bottom side and the outer peripheral surface can be in the formed of large diameter cylindrical portion opening side belt hook, press working or press working a bottomed cylindrical body to roll forming <br/> more The bottom portion of the bottomed cylindrical body is punched by press working, and after this punching, the small-diameter cylindrical portion of the pulley body formed with a belt hooking groove on the outer peripheral surface of the large-diameter cylindrical portion is formed into a cylindrical rotor body. In the manufacturing method of the electromagnetic clutch pulley to be fitted and fixed to the outer periphery, before the step of forming the bottomed cylindrical body serving as the pulley body, at the stage of the plate-shaped pulley material, the step of forming the bottomed cylindrical body is performed in the step of forming the bottomed cylindrical body. Formed between Characterized by drilling the pre-bleeding hole in the annular connection portion scheduled locations that.

Claims (2)

[Claims] 1. A large-diameter cylindrical part having a cylindrical rotor main body and a pulley main body fixed to the outer periphery of the rotor main body. And a small-diameter cylindrical portion integrated with the pulley body, wherein the small-diameter cylindrical portion of the pulley main body is fitted and fixed to the outer periphery of the rotor main body. In the electromagnetic clutch pulley, the small-diameter cylindrical portion and the large-diameter cylindrical portion of the pulley main body are connected. A pulley for an electromagnetic clutch, wherein an annular connection portion is provided with an air vent hole penetrating the connection portion. 2. A method of manufacturing an electromagnetic clutch pulley comprising a cylindrical rotor main body and a pulley main body fixed to an outer periphery of the rotor main body, wherein a plate-like pulley material is provided with a small-diameter cylindrical portion on a bottom side. A bottomed cylindrical body is formed by press working or press working and rolling so that a large-diameter cylindrical part that can be formed and the outer peripheral surface of which becomes a belt hooking part is formed on the opening side, and the bottom of the bottomed cylindrical body is pressed. Punching by processing,
A method for manufacturing a pulley for an electromagnetic clutch, in which the small-diameter cylindrical portion of the pulley body having a belt hanging groove formed on the outer peripheral surface of the large-diameter cylindrical portion after the punching is fitted and fixed to the outer periphery of a cylindrical rotor body. An annular connection formed between the two cylindrical portions in the step of forming the bottomed cylinder at the stage of the plate-shaped pulley material before the step of forming the bottomed cylinder serving as the pulley body. A method for manufacturing a pulley for an electromagnetic clutch, characterized in that an air vent hole is formed in advance at a predetermined portion.