JPH0548057B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention includes a rotor body having a cylindrical shape with a bottom,
This invention relates to a rotor for a magnet generator in which permanent magnets and magnetic pole pieces are arranged on the inner peripheral surface of the peripheral wall of the rotor body.

[Prior Art] This type of rotor includes those shown in FIGS. 1 and 2. That is, the rotor a includes a rotor body b having a bottomed cylindrical shape, and a peripheral wall b1 of the rotor body b.
A permanent magnet d is arranged between the inner peripheral surface of the magnetic pole piece c and the magnetic pole piece c. This permanent magnet d is manufactured by first inserting a screw e into the mounting hole b2 of the peripheral wall b1, passing the screw e through the notch d1 of the permanent magnet d, and screwing the screw e into the screw hole c1 of the magnetic pole piece c. I'm starting to do that.

Therefore, such attachment requires complicated screw-fastening work, and the permanent magnet d cannot be easily attached to the rotor body b.

Therefore, in a rotor of a magnet generator having a bottomed cylindrical rotor body and a plurality of magnets arranged along the inner peripheral surface of the peripheral wall of the rotor body, a plurality of magnet insertion portions and a plurality of wedge insertion portions are provided. A wedge is inserted into the wedge insertion part from the axial direction of the rotor body, and the upper edge of the rotor body is caulked inward to insert the wedge part above the rotor body. There is a magnet that is fixed to the edge to prevent the magnet from flying out (for example, see Japanese Utility Model Application No. 54-9812).

[Problems to be Solved by the Invention] By the way, even in the case where the wedge is used, since the wedge is inserted from the axial direction of the rotor body, the wedge is inserted under pressure in the longitudinal direction where it is easy to bend. There is a problem in that it is difficult to insert the wedge, and the assembling process is troublesome because it requires caulking work at the end.

This invention has been made in view of the problems of the prior art, and its purpose is to fit an expander for expanding the clamping pieces in the radial direction of the rotor body. The present invention also aims to provide a rotor for a magnet generator in which permanent magnets and magnetic pole pieces can be easily and reliably attached to a rotor body by eliminating the need for caulking work.

[Means for Solving the Problems] In order to achieve the above object, the rotor of the magnet generator according to the present invention has a magnet holder attached to the rotor body that holds the permanent magnets and the magnetic pole pieces in the arranged positions, and the magnet The holder consists of a pair of annular plates that hold the bottom and top surfaces of the permanent magnet, and a plurality of connecting parts that connect the two annular plates. A clamping piece that is clamped between the inner circumferential surface of the rotor body is provided between the annular plates, and a fitting groove is formed in the clamping piece to allow the clamping piece to expand in the circumferential direction of the rotor body. The fitting groove is formed with an opening into which an expander for expanding the clamping piece is fitted in the radial direction of the rotor body, and the expander is formed with a retaining portion that prevents the expander from coming out in the fitting groove. The expander is fitted into the insertion groove from the radial direction of the rotor body, and both ends of the permanent magnet and the magnetic pole pieces are held between the inner circumferential surface and the permanent magnet by the holding pieces that are expanded. and a magnetic pole piece attached to the rotor body.

[Operation] After the assembly in which the permanent magnet and magnetic pole piece are held by the magnet holder is placed in the rotor body, the expander is fitted into the insertion groove from the radial direction of the rotor body, and the clamping pieces are expanded. Therefore, the expander is difficult to bend, and both ends of the permanent magnet and the magnetic pole pieces are easily and reliably held between the holding pieces and the inner circumferential surface of the rotor body.
Since the permanent magnets are held down by the annular plates of the pair of magnet holders and the magnet holders are bonded to the rotor body, there is no need for the final crimping operation as in the prior art example.

[Example] Embodiments of the invention will be described with reference to the drawings.

FIG. 3 is a partially cutaway plan view of the rotor of the magnet generator, and FIG. 4 is a sectional view taken along the - line in FIG. 3. The rotor 1 of this embodiment includes a rotor body 2 made of a magnetic material and having a cylindrical shape with a bottom. The rotor main body 2 is adapted to be rotated by a crankshaft of an engine of a motorcycle or the like (not shown) fitted into a through hole 2b in the center of a bottom wall 2a. Further, a magnet holder 3 made of a non-magnetic material is attached to the rotor body 2 along the inner periphery of the peripheral wall 2c.

This magnet holder 3 includes a pair of annular plates 3a and 3b on the bottom and top surfaces, and a permanent magnet 4 is housed between the annular plates 3a and 3b to prevent the permanent magnet 4 from flying out. . and both annular plates 3
a and 3b are connected to each other via a plurality of connecting parts 3c. Further, this magnet holder 3 is fixed to the peripheral wall 2c of the rotor body 2 with an adhesive.

In order to ensure this fixation, a projection 2d is provided on the peripheral wall 2c, and a long groove 3d in the axial direction is provided in the connecting portion 3c of the magnet holder 3.
The magnet holder 3 is fixed to the peripheral wall 2c by the long groove 3d and the long groove 3d.

Next, the connecting portion 3c includes both the annular plates 3a,
A clamping piece 5 is formed between the clamping pieces 5 and 3b, and both sides 5a of the clamping piece 5 are recessed inward and serve as pressing engagement surfaces for the end 4a of the permanent magnet 4 and the end of the magnetic pole piece 8. Further, this clamping piece 5 is formed with a fitting groove 7 into which an expander 6 for expanding the clamping piece 5 is fitted from the radial direction of the rotor body 2. Then, in this fitting groove 7, radially outward of the rotor main body 2,
A wedge-shaped groove 7a and a cylindrical groove 7b are continuously formed. On the other hand, the expander 6 is formed with a wedge-shaped expanded portion 6a that is larger than the wedge-shaped groove portion 7a, and a cylindrical retaining portion 6b that is approximately the same as or slightly larger than the cylindrical groove portion 7b. .

In the embodiment configured as described above, an assembly in which the permanent magnets 4 and the magnetic pole pieces 8 are assembled into the magnet holder 3 is disposed in the rotor body 2, and then the expander 6 is inserted into the groove. When the clamping pieces 5 are fitted from the radial direction of the rotor body 2 toward the opening of the rotor body 2, the clamping pieces 5 are expanded in the circumferential direction of the rotor body 2. Due to this expansion, both sides 5a of the clamping piece 5 press the end 4a of the permanent magnet 4 and the end of the magnetic pole piece 8 toward the inner peripheral surface of the peripheral wall 2c. This pressing allows the permanent magnet 4 and the magnetic pole piece 8 to be easily and reliably attached to the peripheral wall 2c.

In the above-described embodiment, in order to simplify the shapes of the expander 6 and the fitting groove 7, the expander 6 and the fitting groove 7 may be configured as shown in FIG. 5, for example. That is, both 6 and 7 are made into a substantially wedge shape, and the expander 6
A hook-shaped retaining portion 6c is formed in the clamping piece 5, and an engaging groove 5b for locking the retaining portion 6c is formed in the clamping piece 5 facing the hook-shaped retaining portion 6c.

Furthermore, in order to further simplify the configuration of both 6 and 7, they may be configured as shown in FIG. 6, for example. That is, both 6 and 7 are wedge-shaped, a serrated engagement portion 7c is formed on the inner wall of the insertion groove 7, and a serrated locking portion 6d is formed on the circumferential surface of the expander 6 facing this. do.

[Effects of the Invention] In this invention, after the assembly in which the permanent magnet and the magnetic pole piece are held in the magnet holder is placed in the rotor body, the expander is fitted into the insertion groove from the radial direction of the rotor body and held. Since the pieces are made to expand, the expander is difficult to bend when fitting, making the fitting work extremely easy.Also, both ends of the permanent magnet and magnetic pole piece are connected to the holding piece and the inner circumferential surface of the rotor body. It can be easily and securely held between the

Since the permanent magnets are held down by the annular plates of the paired magnet holders, and the magnet holders are bonded to the rotor body, there is no need for the final crimping operation as in the conventional example. It is safe with no permanent magnets coming out.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of the rotor of a conventional magnet generator, FIG. 2 is a sectional view taken along the line - in FIG. 1, and FIGS. 3 and 4 are magnet generators of the present invention. FIG. 3 is a partially cutaway plan view of the rotor, and FIG.
5 and 6 are diagrams showing other examples of the structure of the expander and the insertion groove. DESCRIPTION OF SYMBOLS 1... Rotor, 2... Rotor main body, 2a... Bottom wall, 2c... Peripheral wall, 3... Magnet holder, 3a, 3
b...Annular plate, 3c...Connecting portion, 4...Permanent magnet, 5...Pinching piece, 6...Expander, 6b, 6c,
6d... Retaining portion, 7... Fitting groove, 8... Magnetic pole piece.

Claims (1)

[Scope of Claims] 1. A rotor for a magnet generator including a cylindrical rotor body with a bottom and a plurality of permanent magnets and a plurality of magnetic pole pieces arranged along the inner circumferential surface of the peripheral wall of the rotor body, A magnet holder is attached to the rotor body to hold the permanent magnets and magnetic pole pieces in the arrangement positions, and the magnet holder includes a pair of annular plates that hold the bottom and top parts of the permanent magnets, and both annular plates. A clamping piece is provided between the two annular plates for clamping the end of the permanent magnet and the magnetic pole piece between the inner circumferential surface and the clamping piece. A fitting groove is formed to allow the clamping piece to expand in the circumferential direction of the rotor body, and an opening is formed in the fitting groove into which an expander for expanding the clamping piece is fitted in the radial direction of the rotor body. , the expander is formed with a retaining part that prevents the expander from coming out in the insertion groove, and the expander is fitted into the insertion groove from the radial direction of the rotor body and the clamping pieces are expanded. A rotor for a magnet generator, wherein both ends of the permanent magnet and the magnetic pole piece are sandwiched between the inner circumferential surface and the permanent magnet and the magnetic pole piece are attached to a rotor body.