JPS61277351A - Rotor for magneto generator - Google Patents

Abstract

PURPOSE:To decrease the number of component parts, to reduce manufacturing cost and to improve workability by constituting a core by a laminated plate and using the inner-diameter end surface of the laminated plate as a boss section coupled with a shaft section. CONSTITUTION:The inner-diameter end surface 2 of a core 1 consisting of a laminated plate as a magnetic flux path is coupled at a direct point with a shaft section such as a crankshaft for an engine, and the inner-diameter end surface 2 is made to function as a boss section as a reinforcing member. The inner-diameter end surface 2 of the core 1 is formed to a tapered shape so as to be firmly fitted to the shaft section, and a recessed-section inner-diameter end surface 2a for a connection to a detent member is shaped.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an inner rotor of a magnet generator in an ignition system for an internal combustion engine.

(Prior art) Conventional rotors generally have a boss part as a separate member on the inner diameter part of a core made of a laminated plate with magnets inside, and this boss member is attached to a rotating shaft part such as an engine crankshaft. They are configured to be coupled together to transmit power (for example, Japanese Utility Model Publication No. 38-19408). In this way, a core called laminate plate 'C' is used for the part that becomes the electrical magnetic flux path, and a separate boss part is used for the part that requires mechanical strength, but the boss member as a separate member is required. can be,
Furthermore, there are limits to miniaturization of the entire device due to dimensional constraints.

Furthermore, in the device disclosed in the above publication, plates made of non-magnetic material are provided on both side surfaces of the rotor, and the plates and the laminate core are fastened with rivets. Alternatively, as shown in FIGS. 4, 5, and 5, there is also one constructed by die-casting aluminum. However, in FIGS. 4 and 5, cores 11 and 12 made of laminated plates, magnets 13, and bosses 14 are cast in aluminum die-casting 15 and placed at predetermined positions. be. This boss 14 is located at the rotating shaft portion (
(not shown), it is made of soft a (835C, etc.) to ensure strength, and its inner peripheral surface is tapered and has an engagement groove formed therein. Furthermore, a weight 16 is cast in the opposite side of the magnet 13 for absorbing unbalance.

Even with such a configuration, a boss member is still required and dimensional restrictions are still imposed as described above, and furthermore, there are problems such as a reduced degree of freedom in assembly.

(Object of the Invention) In view of the above-mentioned conventional problems, the present invention shares the core that is the C1 magnetic flux path with the boss that connects the rotating shaft and transmits power, thereby reducing the number of parts and assembling ( The purpose of the present invention is to provide a rotor for a magnet generator with a greater degree of freedom in terms of assembly.

(Structure of the Invention) The present invention provides a rotor for a magnet generator in which power is transmitted by coupling a core containing magnets and serving as a magnetic flux path to a rotating shaft portion, in which the core is made of laminated plates. In addition, the inner diameter end surface of this laminated plate is configured to also serve as a boss portion that connects to the rotating shaft portion.

With this configuration, the inner diameter end surface of the core made of a laminated plate is used as a boss portion that connects to the rotating shaft portion, thereby eliminating the need for a separate member.

(Embodiment) The present invention will be described below with reference to FIGS. 1 to 3 showing an embodiment thereof.

1 is a core made of a laminated plate serving as a magnetic flux path, 2 is an inner diameter end surface of core 1, 3 is a magnet embedded in a part of core 1 so as to form a magnetic pole, and 4 is on both end surfaces of core 1. A plate made of a non-magnetic material is provided, 5 is a rivet that passes through a hole provided in the core 1 and fastens the core 1 together, and 6 is a rivet that passes through a hole provided in the core 1 and the plate 4. This is a rivet that integrally fastens the core 1 and the plate 4, and in the present invention, the inner diameter end surface 2 of the core 1 is directly attached to a rotating shaft (not shown) such as the crankshaft of an engine.
The inner diameter end face 2 has the function of a boss portion as a strength member. The inner diameter end surface 2 of the core 1 is tapered in order to securely fit with the rotating shaft, and a recessed inner diameter end surface 2a is also formed to engage with a rotation prevention member (not shown). There is.

In this embodiment, a notch 1a is provided in the core 1 on the opposite side of the central axis from the part where the magnet 1 to 3 is located in order to achieve =<m balance. In other words, the core 1 itself has the function of a conventional weight.

Incidentally, the assembly structure is not limited to the above embodiment, and instead of riveting as described above, it may be constructed by casting by aluminum die-casting or the like.

In addition, although the rotor as described above is not shown in the diagram,
As is well known, power generation windings are rotatably arranged on the inner periphery of a stator core, and magnetic poles are formed in the rotor core 1 by magnets 3, and this rotor is rotated. As a result, a voltage is induced in the windings on the stator side.

(Effects of the Invention) As described above, according to the present invention, the core is not separated from the boss as in the conventional case, but the boss is formed integrally on the inner diameter end surface of the core, thereby strengthening the core. It can be used as a member, the number of parts can be reduced, and at the same time, the degree of freedom in assembly is increased, and it has great effects such as reducing manufacturing costs and improving workability.

[Brief explanation of the drawing]

Fig. 1 is a front view of a rotor of a magnet generator according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line IF-II in Fig. 1, and Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2. 4 is a front view of a rotor of a conventional magnet generator, and FIG. 5 is a sectional view taken along the line v--v in FIG. 4. 1... Core, 2... Inner diameter end surface, 3... Magnet. Patent applicant Moriyama Kogyo Co., Ltd. Representative Patent attorney Etsushi Kotani
Patent Attorney Chief 1) Seiyo Patent Attorney Yasuo Toritani Figure 1
2. Figure 3

Claims (1)

[Claims] 1. In a rotor of a magnet generator in which a core containing a magnet and serving as a magnetic flux path is coupled to a rotating shaft portion to transmit power, the core is composed of a laminated plate, and
A rotor for a magnet generator, characterized in that the inner diameter end surface of the laminated plate also serves as a boss portion that connects to a rotating shaft portion.