JP2645471B2 - Magnet generator rotor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotor of a magnet generator driven by an internal combustion engine.

[Conventional technology]

As a conventional rotor, a plurality of magnets are arranged in a ring shape on the inner peripheral surface of an iron bowl, and a cylindrical portion of a magnet protective member is disposed along the inner peripheral surface of these magnets. That abuts against the opening end side of each magnet to restrict axial movement of each magnet and to fix the fixing portion of the magnet protection member to the bottom of the iron bowl (for example, Nippon Denso Publications Technical Report, serial number 30-39, issued April 20, 1983).

Also, as disclosed in Japanese Utility Model Laid-Open No. 59-145273,
It is also known that a tapered portion is provided in a press-fitted magnet protection case, and the adhesive is uniformly applied by the tapered portion.

Further, a magnet protection member made of an elastic thin steel plate having cuts formed by being annularly rounded is arranged on the inner peripheral surface of a plurality of arc-shaped magnets arranged at equal intervals on the inner peripheral surface of the iron bowl. A bulging portion that bulges in the outer diameter direction toward the space between the magnets is formed on the member, an annular magnet holding plate is arranged on the end face of the opening end side of each magnet, and the edge of the opening end of the iron bowl is closed. A device in which each magnet protecting member is fixed to an iron bowl via a magnet holding plate (for example, Japanese Patent Publication No. 59-23180) is known.

Further, as disclosed in Japanese Patent Publication No. 58-40422, a magnet holding plate is provided with a bulging portion to absorb stress caused by press-fitting of the magnet holding plate.

[Problems to be solved by the invention]

However, in the technique disclosed in Nippon Denso Public Technical Report, Reference No. 30-39, since only the cylindrical portion of the magnet protection member is arranged along the inner peripheral surface of each magnet, the circumference of each magnet is Since the positioning and holding in the direction cannot be performed sufficiently, it is necessary to use an adhesive to firmly fix each magnet to the iron bowl.
There is a problem that the work is poor.

Similarly, the technique disclosed in Japanese Utility Model Laid-Open No. 59-145273 also uses an adhesive, and has a problem that workability is poor.
Further, when the magnet protective case is deformed during press-fitting of the magnet protective case, there is a problem that the magnet cannot be securely fixed.

On the other hand, in the technique disclosed in Japanese Patent Publication No. 59-23180, an elastic thin steel plate having cuts formed by rolling into an annular shape is used. Since it is necessary to form a portion, the assembling process becomes complicated, and it is necessary to separately arrange a ring-shaped magnet protection plate on the open end side end face of each magnet and caulk the edge of the open end of the iron bowl. In addition, there is a problem that the number of parts increases and the number of assembly steps also increases.

Similarly, in the technique disclosed in Japanese Patent Publication No. 58-40422, it is necessary to form a tongue for positioning the magnet in the circumferential direction by opening a window at the upper part of the cylinder and to fix the magnet in the axial direction. Has a problem that a special configuration and an adhesive are required as in the above-mentioned conventional technology.

Therefore, an object of the present invention is to firmly fix a magnet to the inner peripheral surface of an iron bowl with a simple and small number of parts without using an adhesive.

[Means for solving the problem]

Therefore, the present invention provides a bottomed cylindrical iron bowl (1) having a cylindrical portion (1a) and a bottom (1b), and a predetermined space in the circumferential direction along the inner peripheral surface of the iron bowl. A plurality of arc-shaped magnets spaced apart (4)
And a magnet protection member (5) formed of a thin metal plate provided on the inner peripheral side of the arrangement of the magnets and biasing the magnets toward the outer peripheral side and fixing the magnets in the iron bowl, The magnet protection member is a cylindrical portion that is located along the entire inner peripheral surface of the magnet array and is in direct contact with the magnet without an adhesive to urge the magnet toward the outer peripheral side. Prior to press-fitting the cylindrical portion, the outer shape of the opening end side of the iron bowl is formed into a large-diameter cylindrical shape having an outer size slightly larger than the inner diameter size of the magnet array, and the outer shape of the bottom portion of the iron bowl is formed. The shape is formed in a tapered shape, the outer diameter of the periphery of the bottom side of the iron bowl is smaller than the inner diameter of the magnet array, and the large-diameter cylindrical portion extends along the axial direction. And a bulging portion (5h) slightly bulging in the outer diameter direction toward the space between the magnets is formed. After the press-fitting of the cylindrical portion, the bulging portion bulges to the outer diameter side due to a press-fit allowance at the time of press-fitting, and directly contacts the inner peripheral side corner of the magnet, and the outer diameter side of the bulging portion. A cylindrical portion (5a) formed by pressing the outer peripheral surface of each magnet against the inner periphery of the cylindrical portion of the iron bowl by the surface pressure of the cylindrical portion along with the bulging; A fixing portion (5b) extending from one end of the portion on the bottom side of the iron bowl to the inner peripheral side along the bottom portion of the iron bowl, and fixed to the bottom portion of the iron bowl after press-fitting the cylindrical portion; The magnet extends from the other end of the cylindrical portion along the opening end side end surface of the magnet, and after press-fitting the cylindrical portion, directly contacts the opening end side end surface of the magnet and the shaft of the magnet. Technical means of a rotor of a magnet generator, which is provided with a flange portion (5c) for restricting directional movement, is adopted.

In the parentheses, reference numerals of Examples described later are attached for reference.

[Action]

 The operation of the above-described configuration of the present invention will be described.

In the rotor of the magnet generator of the present invention, first, a magnet is arranged on the inner peripheral surface of the iron bowl, a magnet protection member is pressed into the inner peripheral side from the opening end side of the iron bowl, and a fixing portion of the magnet protection member is fixed. It is fixed to the bottom of the iron bowl and assembled.

At this time, the outer shape of the cylindrical portion of the magnet protection member on the bottom side of the iron bowl is formed in a tapered shape, and the outer size around the bottom portion of the iron bowl is smaller than the inner diameter of the magnet array. Is pressed smoothly.

Then, before the press-fitting, the outer shape of the opening end side of the iron bowl is formed in a large-diameter tubular shape having an outer dimension slightly larger than the inner diameter of the magnet array. Accordingly, a force for shrinking the cylindrical portion is generated in the circumferential direction. This shrinking stress is absorbed by the formation of the bulging portion, and the stress due to the dimensional difference between the outer diameter of the cylindrical portion of the magnet protection member and the inner diameter of the magnet arrangement, and variations in the dimensions of each part are absorbed. You.

Moreover, since the outer diameter of the periphery of the bottom portion of the cylindrical portion is smaller than the inner diameter of each magnet array, even after press-fitting the cylindrical portion, deformation of the fixed portion formed at the bottom of the magnet protection member is small, and The magnet protection member is securely fixed to the bottom of the iron bowl via the fixing portion.

Further, after the press-fitting, the bulging portion of the cylindrical portion of the magnet protecting member is brought into direct contact with the inner peripheral corner portion of the magnet, so that the magnet is securely biased radially outward and in the circumferential direction. To the inner peripheral surface of the iron bowl and fix it. In addition, the axial movement of the magnet is restricted by the flange formed integrally with the cylinder.

As described above, according to the present invention, the magnet is securely fixed inside the iron bowl by the magnet protection member without using an adhesive.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First
In the first embodiment shown in FIG. 2 and FIG.
An iron bowl having a bottom portion 1a and a bottom portion 1b, a stepped portion 1c projecting inward is formed in an annular shape on the inner peripheral surface of the bottom portion 1b side of the cylindrical portion 1a, and a circumferential direction is formed on the stepped portion 1c. In this example, four narrow protrusions 1d are formed at equal intervals. The projections 1d and the steps 1c are formed simultaneously when the iron plate 1 is formed by drawing the iron plate. On the inner diameter side of the bottom 1b of the iron bowl 1, four rivet through holes 1e are formed at substantially the same angular position as the protrusion 1d with respect to the circumferential direction at equal intervals, and the bottom 1b of the iron bowl 1b is formed.
The through hole 1f for positioning is located on the outer diameter side of the through hole 1e for rivet and at substantially the center angle position of the through hole 1e for rivet.
Are formed at equal intervals, and pins 1g that protrude in the axial direction from the inner surface of the iron bowl bottom 1b are formed at four equal pitches at positions on both circumferential sides of these positioning through holes 1f.

A boss 3 is fixed to the bottom portion 1b of the steel bowl by a rivet 2, and the boss 3 is fixed to a crankshaft of the internal combustion engine.

Four arc-shaped magnets 4 are arranged at equal intervals on the inner peripheral surface of the iron bowl cylindrical part 1a, and the bottom of these magnets 4 is an iron bowl stepped part.
1c, the magnets 4 are positioned in the axial direction from the bottom 1b of the iron bowl, and both ends of the magnets 4 in the circumferential direction abut on the protrusions 1d of the iron bowl. 4 iron bowls 1
In the circumferential direction. Furthermore, four corners on the inner peripheral side and four corners 4a on the outer peripheral side of each magnet 4 are chamfered in an arc shape.

A magnet protection member 5 made of a non-magnetic metal plate such as a thin stainless steel having a thickness of about 0.4 mm is press-fitted into the inner peripheral surface of each magnet 4.

The shape of the magnet protection member 5 before press-fitting is as shown in FIGS. 3 and 4, and includes a cylindrical portion 5a having an outer diameter slightly larger than the inner diameter of each magnet 4 array, and a cylindrical portion 5a. An annular fixing portion 5b extending from the lower end of the cylindrical portion 5a in the radial direction and an annular flange portion 5c extending from the upper end of the cylindrical portion 5a in the radial direction are formed by drawing. The cylindrical portion 5a is tapered so that its diameter gradually decreases toward the fixed portion 5b from a position substantially halfway in the axial direction, and the outer diameter of the cylindrical portion 5a around the fixed portion 5b is determined by each magnet. It is slightly smaller than the inner diameter of the four arrays. Further, in the fixing portion 5b of the magnet protection member 5, eight through holes 5d for pin insertion having a diameter slightly larger than the outer diameter of each pin 1g are formed at a position corresponding to each pin 1g of the iron bowl 1. At the same time, four positioning through-holes 5e having the same diameter as the positioning through-holes 1f are formed in the iron bowl 1 at positions corresponding to the positioning through-holes 1f, and further correspond to the spatial positions between the magnets 4. Four notches 5f are formed in the inner diameter portion at equal intervals from the inner diameter side to the middle of the outer diameter side.

Further, in the flange portion 5c of the magnet protection member 5, four notches 5g are formed at equal intervals from the outer diameter side to the middle of the inner diameter side in a portion corresponding to the space position between the magnets 4. Also, four bulging portions 5 slightly bulging in the outer diameter direction toward the space between the magnets 4 are formed at equal intervals in the cylindrical portion 5a of the magnet protecting member 5, and these bulging portions 5h are also fixed. It is formed in a tapered shape in the axial direction in which the width of the tip on the part 5b side becomes narrower. Further, a portion of the flange portion 5c connected to the cylindrical portion 5a is formed with an annular rib 5i curved toward the opening end side to improve the strength, and an inner periphery of the notch 5g of the flange portion 5c. The end extends to an intermediate portion of the rib 5i.

Then, in a state where the magnet protection member 5 is assembled to the iron bowl 1, the cylindrical portion 5 a is disposed in a press-contact state along the inner peripheral surface of each magnet 4, and the fixed portion 5 b is arranged along the fixed portion 1 b of the iron bowl 1. The fixed portion 5b is fixed to the iron bowl 1 by caulking each pin 1g, and the flange portion 5c is arranged in a press-contact state along the opening end side end surface of the magnet 4, and the bulging portion 5h is press-fitted. The four corners on the inner peripheral side of each magnet 4 swell to the outer diameter side due to the press fit allowance
Press into contact with 4a.

Next, the assembling process of the above configuration will be described. Although each pin is located at a position corresponding to each positioning through-hole 1f, 5e, each through-hole 1f is fitted and positioned on each of these pins on the jig, and the iron bowl 1 is placed with its open end upward. And put it on.

Next, four magnets are arranged at equal intervals on the inner peripheral surface of the iron bowl 1 while being positioned by the step portion 1c and the protrusion 1d.

Next, a positioning through-hole 5e is fitted and positioned in each pin of the jig, and the magnet protection member 5 is pressed into the inner peripheral surface of each magnet 4 from the open end side of the iron bowl 1, and the magnet protection member 5 is pressed. Of the iron bowl 1 to the fixed part 1b of the iron bowl 1.

At the time of this press-fitting, since the outer diameter of the cylindrical portion 5a of the magnet protection member 5 is slightly larger than the inner diameter of each magnet 4 array, a force to shrink is generated in the cylindrical portion 5a in the circumferential direction, and most deformation occurs. The stress concentrates on each bulging portion 5h which is easy to be deformed, and each bulging portion 5h is deformed in the outer diameter direction toward the space between the magnets 4 by an amount corresponding to the press-fitting allowance, and the force balance is maintained. It is. At this time, since the flange portion 5c of the magnet protection member 5 and the rib 5i thereof are notched 5g only at a portion opposed to the space between the magnets 4, the flange portion 5c is smaller than the magnet protection member having the rib 5i formed all around. The bulging portion 5h is smoothly deformed in the outer diameter direction.

Further, when the bulging portion 5h is deformed, it may hit the inner peripheral corner 4a of each magnet 4 and be caught, but since the corner 4a of each magnet 4 is chamfered in an arc shape, In addition, it can be prevented from being caught and can be deformed in the outer diameter direction smoothly.

The fixed portion 5b of the magnet protection member 5 is a fixed portion of the iron bowl 1.
1b, the pins 1g of the iron bowl 1 are inserted into the through holes 5d for inserting the pins, and the tips of the pins 1g are swaged to fix the fixing portion 5b to the bottom 1b of the iron bowl 1. Fixed to

In the above configuration, the dimensional variation of each component is absorbed by the deformation of the bulging portion 5h of the cylindrical portion 5a of the magnet protection member 5 in the outer diameter direction, but the bottom side of the cylindrical portion 5a of the magnet protection member 5 is absorbed. Are smaller than the inner diameter of each magnet 4 array, the deformation of the fixing portion 5b of the magnet protection member 5 is small, and the positional displacement of the pin insertion through-hole 5d provided in the fixing portion 5b is small. In addition, there is no defective crimping of the pin 1g due to the pulling of the pin insertion hole 5 due to the deformation of the bulging portion 5d of the magnet protection member 5 in the outer diameter direction and the deformation. As a result, the magnet protection member 5 is firmly fixed to the iron bowl 1 and the magnet protection member 5
Since the outer peripheral surface of each magnet 4 is pressed against the inner periphery of the cylindrical portion 1a of the iron bowl 1 by the surface pressure of the cylindrical portion 5a, each magnet 4 does not move in the axial direction and the circumferential direction. In addition, each pin of the jig and the through hole 5e for positioning make the magnet protection member 5
The fixing portion 5d is press-fitted into the iron bowl 1 in a state where the fixing portion 5d is positioned with respect to the iron bowl 1 at four equal intervals near the center of each magnet 4, so that the pin formed on the fixing portion 5b for inserting a pin is inserted. The change of the through hole 5d is more reliably prevented.

Therefore, in the above configuration, each magnet 4 can be fixed to the iron bowl 1 without the use of an adhesive with a minimum number of parts, and at the same time, the magnet 4 can be protected by the magnet protection member 5, so that the workability is high and the workability is high. We can supply quality rotor. Also,
Since it is not necessary to use a resin or an adhesive, strength and performance can be guaranteed up to the Curie point (about 350 ° C.) of each magnet 4, and a rotor with high weather resistance can be supplied at low cost.

FIG. 5 to FIG. 7 show a second embodiment of the present invention.
As shown in FIG. 8 and FIG.
Instead of the notch 5g, at the space between the magnets 4 in the rib 5i portion of the flange portion 5c, there are formed through holes 5j each having a shape of a long arc in the circumferential direction, and the outer periphery of each through hole 5j. A small recess 5k is formed in the flange portion 5c in the portion.

According to the second embodiment, since the outer peripheral side of the flange portion 5a is connected over the entire circumference, the strength of the entire magnet protection member 5 can be improved and the flange portion 5c can be improved.
Thereby, the pressure surface against the end face on the opening end side of the magnet 4 can be improved. Further, by providing the small recess 5k in the flange portion 5c, the distortion of the flange portion 5c that tends to spread in the outer diameter direction at the time of press fitting of the magnet protection member 5 can be absorbed by the larger recess deformation of the recess 5k.

In each of the embodiments described above, the fixing strength is sufficient without using an adhesive, but the strength may be increased by applying or dropping an adhesive.

The fixing of the fixing portion 5b of the magnet protection member 5 to the bottom 1b of the iron bowl 1 may be performed by screwing or spot welding instead of caulking the pin 1g.

In each of the embodiments described above, the magnet protection member 5
Although almost half of the cylindrical part of the axial direction is tapered, about one third of the axial direction may be tapered, or it may be tapered over almost the entirety. Alternatively, a concave or convex curved surface may be used.

Further, since the magnet protection member 5 is thin, it may be formed of a magnetic material such as an iron plate.

〔The invention's effect〕

As described above, according to the present invention, since the tapered portion is provided in the cylindrical portion of the magnet protecting member, the press-fitting of the magnet protecting member can be easily performed, and the outer diameter shape around the bottom side of the cylindrical portion has the inner diameter of each magnet array. Since it is smaller than the dimensions, the deformation of the fixing portion formed at the bottom of the magnet protection member can be reduced, and the magnet protection member can be securely fixed to the bottom of the iron bowl. Stress due to a dimensional difference from the inner diameter of the magnet array and variations in the dimensions of each part can be absorbed. Moreover, the magnet is urged in both the radial direction and the circumferential direction after the press-fitting of the cylindrical portion by the bulging portion coming into direct contact with the inner corner portion of the magnet, and the magnet moves in the axial direction by the flange portion. Is regulated, so it is securely fixed to the inner peripheral surface of the iron bowl.
Furthermore, the bulging portion extends along the axial direction and can be easily formed simply by deforming the metal plate, and combined with the fact that the cylindrical portion, the fixed portion and the flange portion are integrally formed with the metal plate, a magnet protection member is manufactured. Since the magnet can be easily formed in a simple shape, there is an excellent operational effect that the magnet can be securely fixed with a simple configuration.

[Brief description of the drawings]

1 is a partial sectional plan view showing an embodiment of the rotor of the present invention, FIG. 2 is a vertical sectional view taken along the line II-II 'of FIG. 1,
FIG. 3 is a front view showing the magnet protection member according to the first embodiment, FIG. 4 is a longitudinal sectional view taken along the line IV-IV 'of FIG. 3, and FIG. 5 is a second embodiment of the rotor of the present invention. FIG. 6 is a vertical sectional view taken along line VI-VI ′ shown in FIG. 5, FIG. 7 is a vertical sectional view taken along VII-VII ′ shown in FIG. 5,
FIG. 8 is a front view showing a magnet protection member according to the second embodiment, and FIG. 9 is a longitudinal sectional view taken along the line IX-IX 'shown in FIG. 1 ... iron bowl, 1b ... bottom, 1d ... projection, 1f ... positioning through hole, 4 ... magnet, 5 ... magnet protection member, 5a ... cylinder part, 5b
…… Fixed part, 5c …… Flange part, 5d …… Fixed through hole, 5
e: Through hole for positioning, 5f, 5g: Notch, 5h: Swelling part, 5i: Rib, 5j: Through hole in the shape of a circular arc, 5k: Indent.

Claims (9)

(57) [Claims] 1. A bottomed cylindrical iron bowl (1) having a cylindrical part (1a) and a bottom part (1b), and a predetermined space in a circumferential direction along an inner peripheral surface of the iron bowl. A plurality of arc-shaped magnets (4) arranged apart from each other; and a thin metal plate provided on the inner peripheral side of the arrangement of the magnets, for urging the magnets toward the outer peripheral side and fixing the magnets in the iron bowl. And a magnet protection member (5) formed by the following, wherein the magnet protection member is located over the entire circumference along the inner peripheral surface of the magnet arrangement,
A cylindrical portion that comes into direct contact with the magnet without adhesive and urges the magnet toward the outer peripheral side, and before press-fitting of the cylindrical portion, the outer shape of the iron bowl opening end side is the magnet arrangement. It is formed into a large-diameter cylinder having an outer diameter slightly larger than the inner diameter of the iron bowl, and the outer shape of the iron bowl bottom side is formed in a tapered shape, and the outer diameter dimension of the iron bowl bottom side periphery is The bulge, which is smaller than the inner diameter of the magnet array, further extends in the axial direction in the large-diameter cylindrical portion, and slightly bulges in the outer diameter direction toward the space between the magnets. A portion (5h) is formed, and after the press-fitting of the cylindrical portion, the bulging portion bulges to the outer diameter side due to a press-fit allowance at the time of press-fitting, and directly contacts the inner peripheral side corner of the magnet, As the bulging portion bulges to the outer diameter side, the outer peripheral surface of each magnet is moved by the surface pressure of the cylindrical portion to the cylindrical portion of the iron bowl. Is formed in a cylindrical portion (5a) the cylindrical portion integrally formed by pressing the peripheral, extend to the inner peripheral side than the iron bowl bottom end of the tubular portion along the bottom of the iron bowl,
A fixing portion (5b) fixed to the bottom of the iron bowl after the press-fitting of the cylindrical portion; and a integrally formed with the cylindrical portion, and extending from the other end of the cylindrical portion along an open end side end surface of the magnet. And a flange (5c) for directly contacting the opening end side end surface of the magnet after the press-fitting of the cylindrical portion and restricting the axial movement of the magnet. 2. The method according to claim 1, wherein the flange portion has a plurality of notches (5g) formed from the outer diameter side to the middle of the inner diameter side corresponding to the position of the bulging portion. A rotor for the magnet generator according to claim 1. 3. A plurality of through holes (5) formed in a long slot shape in the circumferential direction corresponding to the position of the bulging portion.
The rotor of the magnet generator according to claim 1, further comprising: j). 4. The rotor according to claim 3, wherein said flange portion has a recess (5k) formed on an outer peripheral portion of said through hole (5j). . 5. A pin of a jig is inserted into each of the bottom portion of the iron bowl and the fixing portion of the magnet protection member near the center of the magnet, and the iron bowl and the magnet protection member are inserted. 2. A rotor for a magnet generator according to claim 1, wherein a plurality of positioning through holes (1f, 5e) for positioning the rotor are formed. 6. The fixing portion of the magnet protection member is provided with a plurality of fixing through holes (5d) for fixing the fixing portion to the bottom of the iron bowl. The rotor of the magnet generator according to claim 1, wherein: 7. The fixing device according to claim 1, wherein the fixing portion includes a plurality of notches (5f) formed from the outer diameter side to the middle of the inner diameter side corresponding to the position of the bulging portion. A rotor for the magnet generator according to claim 1. 8. A protrusion (1d) for positioning the magnet in a circumferential direction when the magnet is assembled is integrally formed on the bottom side of the iron bowl. 2. The rotor of the magnet generator according to claim 1. 9. The flange according to claim 1, wherein a rib (5i) curved toward the opening end side is formed in a portion continuing from the cylindrical portion in the flange portion. Magnet generator rotor.