JP2001045686A - Power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize reduction in temperature rise of a coil, without increase in the number of part items. SOLUTION: A rotor 20 of the power generator 10 is formed integratedly with a boss 21 and an arm 22. An iron core 40 and a coil 42 are accommodated within a recess 22a of the arm 22. An annular projected part 23 projected in the inversely recessed side is integrated with the inversely recessed side of the arm 22. A through-hole 24 provided through the arm 22 is formed as a plurality of holes bridging over the interval circumference side and external circumference side of the annular projected part 23. A one-way clutch 1 clogs the internal circumference side of the through-hole 24, located at the rotation center side of the arm 22 at the boundary of the annular projected part 23. When the rotor 20 rotates, the air in the recessed region 22a side of the arm 22 presses through the internal circumference side of through-hole 24 and the external side of the through-hole 24 and then flows out of the inversely recessed side of the arm 22, so that the iron core 40 and coil 42 provided at the internal circumference side of the recess 22a are cooled with the air flow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator for transmitting a driving force of a starter to a rotor via a one-way clutch.

[0002]

2. Description of the Related Art In recent years, for example, in an internal combustion engine (hereinafter referred to as an "internal combustion engine"), it has become necessary to increase the output of a generator as the number of electric components increases. Further, there has been manufactured a generator that transmits a driving force of a starter to a rotor of a generator that rotates together with a crankshaft through a one-way clutch, thereby reducing the number of parts of the engine and reducing the size and weight of the engine.

[0003] Increasing the output of the generator can be realized by increasing the amount of magnet rotating with the rotor. However, the amount of heat generated in the coil increases as the output increases, and may exceed the heat resistance limit of the coil. So, the real public 60-60-19
In the generator disclosed in Japanese Patent Publication No. 508, a boss formed separately from an iron bowl as a rotor closes a part of an air hole formed in the iron bowl, so that the iron bowl is rotated with the rotation of the rotor. Attempts to cool the entire generator, including the coils, by disturbing the air inside.

[0004]

[Problems to be Solved by the Invention]
In the generator disclosed in Japanese Patent No. 19508, an iron bowl surrounding the stator and the coil, and a boss portion coupled to a crankshaft or the like are formed separately, so that the number of parts increases. In addition, since a configuration in which a one-way clutch is provided is not disclosed, how to cool the coil when the one-way clutch is attached to the rotor is not described. When the one-way clutch is attached to the rotor, the one-way clutch covers the rotor. Therefore, even if an air hole is formed in the rotor, it is difficult for the one-way clutch to block the air flow and to reduce the temperature rise of the coil. . An object of the present invention is to provide a generator that reduces a temperature rise of a coil without increasing the number of components.

[0005]

According to the power generator of the present invention, a through-hole penetrating through the rotating portion across the inner and outer peripheral sides of the annular projection for fitting the one-way clutch is provided. Is formed. The rotation center side of the through hole is closed by a one-way clutch, and the outer peripheral side of the through hole is open. As the rotor rotates, air on the rotation center side of the through hole moves to the outer peripheral side of the through hole that is not closed by the one-way clutch due to centrifugal force. As a result, the rotation center side of the through hole becomes a negative pressure, and the air on the concave side of the rotating portion that houses the coil is sucked into the rotation center side of the through hole. The air that has moved from the rotation center side of the through hole to the outer peripheral side of the through hole flows out through the through hole to the opposite side of the rotating portion. As described above, the air on the concave side of the rotating part flows out from the rotation center side of the through hole to the opposite concave side of the rotating part through the outer peripheral side, so that the coil disposed on the concave side of the rotating part causes air flow. Cooling. For example, by increasing the amount of magnet that rotates with the rotor, the output of the generator increases, and even if the heat generation of the coil increases, the coil is effectively cooled, so that the generator can be cooled without exceeding the heat resistance limit of the coil. Output can be increased. Also, by forming the rotor by integrally forming the rotating part and the boss part, and by devising the position of the through hole as an air hole formed in the rotating part, the coil can be formed without increasing the number of parts. Can be cooled.

According to the generator of the present invention,
The inner peripheral wall of the rotating part forming the through hole is formed in a tapered shape in which the diameter increases on the side opposite to the concave side toward the side opposite to the concave side. Since the air passing through the through-hole flows along the tapered surface to the opposite side of the rotating part to the concave side, the air flowing to the opposite side of the rotating part to the concave side does not generate a vortex, and rotates from the concave side of the rotating part through the through hole. The air smoothly moves to the side opposite to the concave portion of the portion. Therefore, the coil can be cooled effectively.

[0007] According to the generator of the third aspect of the present invention,
The outer peripheral wall of the boss formed on the concave side of the rotating part is formed into a smooth curved surface. The air flowing on the concave side of the rotating portion smoothly flows along the outer peripheral wall of the boss portion and flows out of the through-hole to the opposite concave portion side of the rotating portion, so that the coil can be cooled effectively.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. One embodiment of the generator of the present invention is shown in FIG. The generator 10 is a so-called flywheel type magnet generator. The rotor 20 of the generator 10 has a boss portion 21 and a bowl portion 22 as a rotating portion and is integrally formed. Iron core 40 and coil 4 as stator
2 is housed in the recess 22 a of the bowl 22. Bowl part 2
An annular protruding portion 23 protruding toward the opposite concave portion is formed integrally with the bowl portion 22 at the opposite concave portion side. The boss portion 21 is formed so as to protrude toward the concave portion 22 a side of the bowl portion 22, and is fixed to the crankshaft 1 and the bolt 5. The one-way clutch 11 is fitted on the inner peripheral side of the annular projection 23 and is fixed to the bowl 22 by bolts 6. The one-way clutch 11 is connected to the free wheel gear 2 via a scrub 12.
The free wheel gear 2 is gear-coupled to a starter (not shown), and transmits the driving force of the starter to the rotor 20 via the one-way clutch 11. The free wheel gear 2 is fitted on the crankshaft 1 via a bearing 3 and is rotatable with respect to the crankshaft 1.

As shown in FIG. 2, a plurality of through holes 24 are formed in the bowl portion 22 so as to straddle the inner and outer peripheral sides of the annular projection 23 and pass through the bowl portion 22. As shown in FIG. 1, a tapered surface 25 is formed on the inner peripheral wall of the bowl portion 22 forming the through hole 24, the diameter of which increases from the recessed side of the bowl 22 toward the recessed side. The one-way clutch 11
With the annular protrusion 23 as a boundary, the inner peripheral side of the through hole 24 which is the rotation center side of the bowl 22 is closed, and the outer peripheral side of the through hole 24 is opened. The permanent magnet 30 is attached to the inner peripheral wall of the concave portion 22a using cases 31 and 32. An iron core 40 as a stator is disposed on the inner periphery of the concave portion 22 a of the rotor 20 so as to face the permanent magnet 30. Iron core 40 is bolt 7
To the cover 4. Coil 42 is iron core 4
It is wound on a spool 41 attached to the zero.

Next, the operation of the generator 10 will be described. When the engine is started, when the ignition key is turned on and the starter rotates, the driving force of the starter is transmitted to the rotor 20 via the free wheel gear 2 and the one-way clutch 11. Then, the driving force of the starter is transmitted from the rotor 20 to the crankshaft 1, and the engine starts. When the engine starts normal operation, the one-way clutch 11 idles with respect to the free wheel gear 2.

When the rotor 20 rotates, as shown in FIG. 3, air on the inner peripheral side B of the through hole 24 is separated by centrifugal force.
4 moves to the outer peripheral side C. Then, the inner peripheral side B becomes a negative pressure, and the air on the concave side 22a side A of the bowl portion 22 flows into the inner peripheral side B. The air moved to the outer peripheral side C is pushed by the air flowing into the inner peripheral side B and flows out to the opposite concave side D of the bowl portion 22.

As described above, the air in the concave portion 22a side A of the bowl portion 22 flows through the inner peripheral side B of the through hole 24 and the outer peripheral side C of the through hole 24 to the opposite concave portion D of the bowl portion 22. Iron core 40 and coil 4 provided on the inner periphery of recess 22a
2 is cooled by the air flow. Further, since the tapered surface 25 is formed on the opposite side of the inner peripheral wall of the bowl portion 22 that forms the through-hole 24, the generation of a vortex in the air flowing out of the through-hole 24 is reduced, and the air is removed from the through-hole 24. Flows smoothly out of 24. Further, since the outer peripheral wall of the boss portion 21 is formed into a smooth curved surface, the resistance of the air flowing in the concave portion 22 a of the bowl portion 22 is small, and the air flows smoothly along the outer peripheral wall of the boss portion 21. Therefore, iron core 40 and coil 42 are cooled well.

As described above, in the present embodiment, the rotor 20 is formed by integrally forming the boss 21 and the bowl 22, and the position of the through hole 24 formed in the bowl 22 is devised. The coil 42 can be effectively cooled without increasing the number of parts. Therefore, even if the amount of heat generated by the coil 42 increases as a result of increasing the amount of the permanent magnet 30 attached to the rotor 20 to increase the output of the generator 10, it is possible to prevent the coil 42 from exceeding the heat resistance limit.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a generator according to an embodiment of the present invention.

FIG. 2 is an arrow view of the rotor viewed from a direction II in FIG. 1;

FIG. 3 is a cross-sectional view showing the periphery of a through hole.

[Explanation of symbols]

 Reference Signs List 10 generator 11 one-way clutch 20 rotor 21 boss part 22 bowl part (rotating part) 22a concave part 24 through hole 25 tapered surface 30 permanent magnet 40 iron core (stator) 42 coil

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 5H607 AA02 BB02 BB09 BB14 BB17 BB27 CC01 DD02 EE05 EE31 FF02 FF22 GG09 JJ05 JJ06 5H609 BB04 BB13 BB24 PP02 PP06 PP09 QQ02 QQ12 QQ14 QQ18 RR27 RR36H05 GB42 RR27 RR36H05 JK05 JK08 JK11 JK15 JK18 5H622 AA06 CA02 CA05 CA10 CB05 PP05 PP17 PP19

Claims (3)

[Claims] 1. A coil, a rotating portion having a concave portion for accommodating the coil and having an annular projection protruding toward the opposite concave portion, and a boss portion provided at the center of rotation of the rotating portion. A rotor that is formed, a permanent magnet that rotates together with the rotating part, and a one-way clutch that fits on the inner peripheral side of the annular protrusion and transmits a driving force of a starter to the rotor. A through-hole is formed in the rotating portion and extends through the rotating portion over the outer and inner circumferential sides of the annular protrusion, and the one-way clutch closes a rotation center side of the through-hole. Generator. 2. An inner peripheral wall of the rotating portion forming the through hole is formed in a tapered shape on the opposite side of the rotating portion toward the opposite side of the concave portion. Item 7. The generator according to Item 1. 3. The generator according to claim 1, wherein the boss is formed on the concave side of the rotating portion, and an outer peripheral wall of the boss is formed into a smooth curved surface. .