JPS5934028A - Molding method of electromagnetic clutch rotor - Google Patents

Abstract

PURPOSE:To easily prepare an electromagnetic clutch rotor with the high reliability for dimensional accuracy and strength further with the excellent rotary balance, by rotating a mold while the metal in a molten state having a magnetic characteristic is poured into the separable mold. CONSTITUTION:A clutch rotor 10 is rotatably supported through a ball bearing 4 onto the periphery of a cylindrically protruding part 3 protruded in the direction of a shaft from the main unit 1 of a compressor so as to involve the main shaft 2. To mold this rotor 10, a mold 6 consisting of separate molds is combined and rotated while pouring the molten metal into the mold 6. And the mold 6 is constituted by a pouring gate 611 and a tap hole part 612 of the molten metal, upper part 61 equipping an annular flange part 613 for forming the part of almost U-shaped section in the rotor 10, barrel part 62 equipping a part 621 for forming a V-grooved part of the rotor 10, bottom part 63 equipping a plane part 631 for forming a frictional face of the rotor 10, and a base part 64 for molding an internal cylinder forcibly contacted to the bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming an electromagnetic clutch, particularly a clutch rotor that constitutes an electromagnetic clutch that is attached to a refrigerant compressor used in a vehicle air conditioner and controls power transmission with an engine.

Conventionally, various methods have been used for molding the flannel joint, which is a component of an electromagnetic clutch, and a typical conventional example will be explained with reference to FIGS. 1 to 3.

The Sunzu electromagnetic clutch has a furanochiro 5 which is rotatably supported on the outer periphery of a cylindrical protrusion 6 via a ball bearing 4, which protrudes axially outward from the compressor main body 1 so as to enclose the main shaft 2.
have. The clutch rotor 5 is generally forged as shown in FIG. However, when forming a clutch rotor by forging, after forming a clutch rotor in its original shape by forging (7), in order to obtain dimensional accuracy, a finishing process by cutting must be performed on the entire circumference of the original shape, and The drawback is that it takes a long time and wastes materials.

In order to eliminate these drawbacks and reduce the weight of the electromagnetic clutch, the clutch rotor 5 is constructed as shown in FIG. It is known that a structure is known in which the furanochiro-ri 5 is obtained by separating the parts into two parts, molding each part by press working, and then welding them together to obtain the furanochiro-ri 5. However, even in a clutch rotor having such a configuration, the rotor portion 51 must be formed using a large press machine similar to cold forging, so an annealing process is included after the press process to remove distortion caused by forming. This method has the disadvantage that multiple steps are required and the molding process is complicated. Dimensions rotor part 51
When the pulley portion 52 is welded onto the outer periphery of the welding surface, there is a drawback that the rotational balance cannot be maintained depending on the finish of the welded surface.

Furthermore, as shown in FIG. 6, a bearing pressure-welding inner cylinder 56 that is joined to the outer race of the ball bearing 4 and a joining plate 54 having a suction surface are integrally formed into an L-shape by press working, and then the outer periphery of the joining plate 54 is formed. A clutch rotor 5 configured to have a pulley portion 55 formed by press working on the top thereof joined by welding or the like.
It has been known. However, even with a clutch rotor having such a configuration, the strength of the welded portion is unstable, the machining time is long, and the rotational balance must be adjusted.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic clutch having a latch rotor that is inexpensive and lightweight by a simple molding method and eliminates the above-mentioned drawbacks that often impair magnetic performance.

That is, a method for molding an electromagnetic clutch rotor, which comprises molding a clutch rotor constituting an electromagnetic clutch by rotating a splittable mold while pouring a molten metal having magnetic properties into the mold. It is.

The present invention will be described below with reference to FIGS. 4 and 5 showing embodiments.

The structure of an electromagnetic clutch having a clutch rotor molded according to the present invention will be described with reference to FIG.

A clutch rotor 10 molded according to the present invention is rotatably supported via a ball bearing 4 on the outer periphery of a cylindrical protruding filter that protrudes axially outward from the compressor body 1 so as to enclose the main shaft 2. ing. A clutch 11 is fixed to the end of the main shaft 2 that protrudes outward from the cylindrical protrusion 6.
A suction plate 12 is disposed on the outer periphery of the clutch hub 11 and is connected to the clutch hub 11 with a gap therebetween via a plurality of leaf springs.

The suction plate 12 is formed on the axial end surface of the clutch rotor 10 and is disposed so as to face the suction surface with a certain gap therebetween. In addition, a core 15 that encloses a coil 16 and is stationary and fixed to the compressor main body 1 by a retaining plate 14 so as to be concentric with other rotating parts is located in a substantially U-shaped cross-section of the clutch rotor 10 . It is located with a Here, the V-groove 16 of the clutch rotor 10 is pulled by a V-belt (not shown) connected to a rotating and driving source such as an engine, so the clutch rotor 10 is constantly rotated and driven by the engine, etc. .

Next, a method of forming a clutch rotor according to the present invention will be explained with reference to FIG.

FIG. 5 is a sectional view of a mold used for carrying out the molding method of the present invention, and the mold 6 is used to transfer molten metal into the mold 6.
A pouring spout 611 for pouring the liquid is provided inside, and a relief portion 6 is provided on one end surface.
12, a mold upper part 61 having an annular flange part 61 protruding in the axial direction so as to form a substantially U-shaped cross section of the clutch rotor, and a V-groove shaped part 621 forming a V-groove part of the clutch rotor on the inner peripheral surface. A mold lower part 66 having a formed annular body part 62, a flat part 661 forming a friction surface of the clutch rotor, and a base part 6 forming a bearing pressure-welding inner cylinder.
It is composed of 4.

After the molds 6 made up of such split molds are assembled, molten low carbon cast steel is poured into the molds 6 through a spout 611 provided at the upper part 61 of the molds, and the molds 6 are rotated. The injection of molten cast steel is continued while rotating the mold 6,
After every corner of the mold 6 is completely filled, the mold 6 is stopped. The rotation of the mold B is stopped after the cast steel is poured, and then the mold 6 is divided to take out the clutch rotor formed into the original shape. A completed clutch rotor can be obtained by cutting only the portions corresponding to the relief portions of the original clutch rotor taken out from the mold 6.

According to the above-described forming method, since the mold is rotated when molten cast steel is injected into the mold, the centrifugal force can uniformly fill the cast steel into the mold.

The electromagnetic clutch rotor molded by this method has the power transmission surface, friction surface, and bearing press contact part all integrally molded, which greatly improves dimensional accuracy and reliability of strength, improves rotational balance, and prevents lateral wobbling. It can be resolved. Furthermore, since the number of steps is reduced, it is possible to reduce costs.

[Brief explanation of the drawing]

Figure 1 is a sectional view of an electromagnetic clutch equipped with a clutch rotor formed by forging, and Figure 2 is a cross-sectional view of an electromagnetic clutch equipped with a clutch rotor consisting of a rotor holder part formed by forging and a pulley part formed by pressing. cross section,
Figure 3 shows the suction surface and the V formed separately by rolling.
FIG. 4 is a sectional view of an electromagnetic clutch equipped with a clutch rotor formed by the molded blade method of the present invention; FIG. 5 is a sectional view of a mold according to the invention. 6.Mold 10...Clutch rotor 11 Clutch hub 1.Coil 14.Holding plate 15.Core 16.V groove 6
1. Upper part of mold 62. Middle part of mold 63. Lower part of mold 64. Base 611. Spout 612. Relief part
616...7 Runno part 621...V groove shaped part
661・Planar part patent applicant Figure 1 Figure a Figure 1J 4 Figure 6

Claims (1)

[Claims] Molten metal having magnetic properties is poured into a splittable mold while the mold is rotated. Molding of an electromagnetic clutch rotor, characterized by molding a clutch rotor constituting an electromagnetic clutch. Method.