JPS6392246A - Magnet rotor - Google Patents

Abstract

PURPOSE:To improve mass productivity, by supporting a cylindrical magnet with a cylindrical member, and by centering the shaft of a rotor between a disc-formed end plate and the cylindrical member. CONSTITUTION:A magneto rotor comprises a knurled or staked shaft 1 enaged at both ends with circular end plates 3 and 4, and a cylindrical magnet 6 press- fitted into a cylindrical member 5 supported by the end plates 3 and 4. Then, the manufacture or assembly of the magneto rotor can be performed by a robot or the like, and without the need of bonding on a section engaged with the shaft core of the rotor, the magneto rotor suitable for mass prodiction at a low cost can obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnet rotor, and particularly to a magnet rotor suitable for mass production.

[Conventional technology]

Various methods have been proposed in the past for manufacturing magnet rotors, and they can be roughly divided into those using adhesives and those using die cast casting.6 A method using adhesives is disclosed in Japanese Patent Application Laid-Open No. 61-42257. There is Japanese Patent Application Laid-open No. 15012/1983 for die cast casting.

However, in the former case, the shape of the magnet is complicated, so it takes time to process the magnet, and the core of the L-shaped annular body needs to be exposed through adhesive, so the balance is easily lost. No consideration was given. Regarding the latter, no consideration was given to the fact that equipment for die casting is required and that it takes time to manufacture the magnet rotor due to die casting.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology does not take into consideration the fact that the core is difficult to come out and that it takes a long time to produce, and there are problems in that it is not suitable for mass production.

An object of the present invention is to provide a magnet rotor that is inexpensive and suitable for mass production.

[Means for solving problems]

The above purpose is to fit a disc-shaped end plate I onto a shaft that has been knurled or staked, and to
The inner peripheral surface of a non-magnetic cylindrical member having a cylindrical magnet press-fitted into the inner peripheral side is fixed onto the outer periphery of the disc-shaped end plate II. This is achieved by manufacturing a magnet rotor together.

[Effect]

The cylindrical magnet is supported by the cylindrical member, and the axis of the rotor can be projected between the disc-shaped end plate and the cylindrical member.

Thereby, a magnet rotor suitable for mass production can be obtained.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 shows a cross-sectional view of the magnet rotor of the present invention.

1 is a shaft with knurling or staking 2, and a disc-shaped end plate I3 and a disc-shaped end plate ■4 are fitted on both sides of the shaft 1, and a cylindrical magnet 6 is press-fitted by both end plates 3 and 4. It supports the member 5.

FIG. 2 shows the manufacturing sequence of the magnet rotor of the present invention.

As shown in FIG. 2(a), the magnetic rotor is first fitted by press-fitting a disc-shaped end plate I3 onto the shaft 1 which has been knurled or staked 2. Then, the cylindrical member 5, in which the cylindrical magnet 6 is press-fitted into the inner peripheral surface 5a of the first cylindrical member, is press-fitted into the outer peripheral surface 3b of the disc-shaped end plate I3. Then the second
As shown in FIG. 1 to obtain a magnet rotor.

When a magnet rotor is manufactured in this way, it can be assembled by a robot, etc., and there is no need for adhesive on the part related to the axis of the single rotor, and there is no need for die casting, so it is inexpensive and suitable for mass production. A magnetic rotor is obtained. In addition, since the shaft center is easily exposed, the amount of unbalance of the rotor can be reduced, and a magnet rotor suitable for high-speed rotation can be obtained.

Note that the disk-shaped end plate 1 is attached to the cylindrical member 5 into which the cylindrical magnet 6 is press-fitted.
．． When II is press-fitted and fitted, the cylindrical magnet 6 and the cylindrical member 5
If the fit between the sides 6a and 6 of the cylindrical magnet 6 is poor,
b and disc-shaped end plate 13. Even if an adhesive is applied between the side surfaces 3a and 4b of II4 and fixed with the adhesive, the mass productivity of the present invention will not be reduced.

FIG. 3 shows another embodiment of the present invention, in which the disk-shaped end plate I3 and the cylindrical member 5 are made integrally, thereby reducing the number of steps required to assemble the magnet rotor.

FIG. 4 shows another embodiment of the present invention, in which the inner diameter of the cylindrical member 5 is made into two stages, and a portion 5b into which a disc-shaped end plate 3.4 is press-fitted;
By reducing the wall thickness of 5c, loosening of the fit between the cylindrical member 5 and the cylindrical magnet 6 due to the press-fitting of the disc-shaped end plates 3 and 4 can be prevented.

FIG. 5 shows another embodiment of the present invention, in which a concave portion 3c is provided in the disc-shaped end plate 3 and the shape is U-shaped to reduce the weight of the magnet rotor.

FIG. 6 shows another embodiment of the present invention, in which a convex portion 3d is provided on the outer circumferential surface 3b of one disc-shaped end plate 3 to facilitate positioning of the cylindrical member 5.

As described above, according to the other embodiments shown in FIGS. 3 to 6, the mass productivity of the magnet rotor of the present invention can be improved.

〔Effect of the invention〕

According to the present invention, since the shaft core is removed at the fitting portion without using adhesive, automatic assembly by a robot or the like is possible.

This has the effect of providing a magnet rotor suitable for mass production.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a magnet rotor showing an embodiment of the present invention;
FIG. 2 is an explanatory diagram showing the manufacturing process of the rotor, FIGS. 3 and 4 are structural diagrams of internal members showing other embodiments of the present invention, and FIGS. 5 and 6 are similar to other embodiments. It is a shape diagram of the disc-shaped end plate which shows an example.

Claims (1)

[Claims] 1. In the magnetic rotor of a brushless DC motor, a non-magnetic disc-shaped end I is fitted onto the knurled or staked shaft, and a cylindrical magnet is placed on the inner periphery on the outer periphery of the end plate. A rotating magnet characterized in that the inner peripheral surface of a press-fitted non-magnetic cylindrical member is fixed, and a disc-shaped end plate II is fitted onto the shaft axis on the opposite side of the disc-shaped end plate I. Child.