JP2001286100A - Internal combustion engine generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently cool a stator of a generator driven by a crankshaft of an internal combustion engine. SOLUTION: This generator 23 housed in a generator cover 18 of an internal combustion engine has a rotor 21 fixed to a shaft end 15d of a crankshaft, and a stator 22 which is fixed to the inner surface of the generator cover 18 and accommodated in the recess 21a of the rotor 21 with a gap α. Oil, which is made to flow from a main gallery 32 through oil paths P7-P9 of the generator cover 18 and jetted out from an oil jet 35, collides with the upper inner surface of the recess 21a of the rotor 21 through the gap α and the coil 30 of the rotor 21 is splashed by the scattered oil mist, so that an excellent cooling effect is exhibited. While the oil descends in the recess 21a of the rotor 21, the respective parts of the stator 22 can be cooled and, after the oil reaches the bottom part of the rotor 21, it is made to splash up again to contribute to the cooling of the stator 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a rotor fixed to a shaft end of a crankshaft of an internal combustion engine and rotating, and a stator opposed to the inner peripheral surface of a concave portion of the rotor with a gap. The present invention relates to a generator for an internal combustion engine.

[0002]

2. Description of the Related Art Such a generator for an internal combustion engine is disclosed in
No. 18284, Utility Model Registration No. 2537422, Japanese Patent No. 2898257, Japanese Utility Model Publication No. 5-4577
No. 8 discloses this.

[0003] Japanese Patent Publication No. 2-18284 discloses that oil supplied from a shaft end of a crankshaft supporting a rotor of a generator is scattered in a radial direction by centrifugal force, and a coil is generated with power generation. Cools the heated stator.

[0004] Further, in the above-mentioned utility model registration No. 2537422, the oil is supplied to the inner peripheral surface of the stator from the bearing portion of the crankshaft supporting the rotor of the generator, so that the coil is generated with the power generation. Cools the heated stator.

[0005] Japanese Patent No. 2898257 discloses a technique in which oil is supplied from a bearing of a crankshaft supporting a rotor of a generator to an upper portion of the generator via an oil passage formed in a crankcase wall. Then, oil is dropped onto the stator of the generator to cool the stator in which the coil generates heat with power generation.

[0006] Japanese Patent Publication No. 5-45778 discloses a generator room which is in communication with an oil pan via a labyrinth by covering the outer periphery of a generator rotor with an inner wall and an outer wall. The oil that has accumulated in the generator chamber and is agitated cools the stator, in which the coil generates heat during power generation.

[0007]

In the above-described conventional motor, oil for cooling the stator of the generator is supplied through the crankshaft, so that the oil after lubricating each part of the crankshaft is supplied to the stator. As a result, there is a problem that it is difficult to arbitrarily set the oil amount and the oil pressure of the oil. In addition, the temperature of the upper portion of the stator becomes the highest because the heated air rises. However, the above-described conventional device has a problem that it is difficult to intensively target the high-temperature portion of the upper portion of the stator.

The present invention has been made in view of the above circumstances, and has as its object to effectively cool a stator of a generator driven by a crankshaft of an internal combustion engine.

[0009]

According to the first aspect of the present invention, there is provided a rotor which is fixed to a shaft end of a crankshaft of an internal combustion engine, and comprises a rotor which rotates. A generator for an internal combustion engine, comprising: an inner peripheral surface of a concave portion; and a stator opposed to the inner surface of the concave portion with a gap therebetween, comprising: an oil jet for jetting cooling oil to a rotor through the gap. A generator is proposed.

According to the above configuration, the cooling oil spouted from the oil jet is sprayed on the rotor through the gap between the inner peripheral surface of the recess of the rotor of the generator and the stator. The mist-shaped oil colliding with the peripheral surface is uniformly contacted with the stator to effectively cool the coil provided on the stator, and the oil is held in the recess of the rotor that houses the stator. The cooling effect can be further enhanced.

According to the second aspect of the present invention,
In addition to the configuration of the first aspect, a generator for an internal combustion engine is proposed, wherein the oil jet is directed to a gap on the upper side of the rotor.

According to the above configuration, since the oil jet is directed to the gap on the upper side of the rotor, the oil can be focused on the coil on the upper part of the stator where the temperature tends to be the highest, so that the cooling effect can be enhanced.

According to the third aspect of the present invention,
In addition to the configuration of claim 1, there is proposed a generator for an internal combustion engine, wherein the oil jet is provided in an oil passage branched directly from a main gallery of the internal combustion engine.

According to the above configuration, since the oil jet is provided in the oil passage branched directly from the main gallery of the internal combustion engine, the oil after passing through each lubricated portion of the internal combustion engine from the main gallery is supplied to the oil jet. In comparison with the case, the amount and the oil pressure of the oil supplied to the oil jet can be arbitrarily set.

According to the invention described in claim 4,
In addition to the configuration of claim 1, the rotor is fixed to the shaft end of the crankshaft with the concave portion facing outward in the axial direction, the stator is fixed to the inner surface of the generator cover covering the rotor, and the oil jet is fixed to the generator cover. A generator for an internal combustion engine characterized by being provided is proposed.

According to the above configuration, even if the recess of the rotor faces outward in the axial direction of the crankshaft, the oil jet is provided on the generator cover covering the rotor, so that the recess of the rotor passes through the gap between the rotor and theta. Oil can be injected inside.

According to the invention described in claim 5,
In addition to the configuration of claim 1, the rotor is fixed to the shaft end of the crankshaft with the concave portion facing inward in the axial direction, the stator is fixed to the outer wall surface of the crankcase, and the oil jet is provided on the crankcase. A generator for an internal combustion engine characterized by the following is proposed.

According to the above construction, even when the recess of the rotor faces inward in the axial direction of the crankshaft, the oil jet is provided on the crankcase wall, so that the oil is injected into the recess of the rotor through the gap between the rotor and the stator. Can be injected. In addition, since it is not necessary to form an oil passage for supplying oil to the oil jet in the generator cover, the processing cost of the generator cover can be reduced.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 4 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a generator for an internal combustion engine, and FIG.
3 is a sectional view taken in the direction of arrow 3 in FIG. 1, and FIG. 4 is an explanatory view of the operation.

As shown in FIGS. 1 to 3, an internal combustion engine E mounted on a motorcycle includes an upper crankcase 12 in which a cylinder block in which a cylinder sleeve 11 is cast is connected. And a lower crankcase 13 coupled to a lower surface of the lower crankcase 13, and a journal support wall 12 a integral with the upper crankcase 12 and a journal support wall 1 integral with the lower crankcase 13.
The journal 15a of the crankshaft 15 is supported on the mating surface 3a via the bearing metal 14. The crankshaft 15 includes upper and lower journal support walls 12a and 13
A web 15b and a crank pin 15c are accommodated inside a, and the large end of the connecting rod 16 is supported by the crank pin 15c. An annular generator cover mounting surface 17 is formed on outer surfaces of the upper crankcase 12 and the lower crankcase 13, and a cup-shaped generator cover 18 is formed on the generator cover mounting surface 17.
The bolts 19 are detachably connected to each other.

A generator room 20 surrounded by upper and lower journal support walls 12a, 13a and a generator cover 18.
Generator 23 having rotor 21 and stator 22
Is stored. The rotor 21 includes a concave portion 21a that is open on the axially outer end side of the crankshaft 15 (the side opposite to the upper crankcase 12 and the lower crankcase 13), and a boss portion 21c in which a mounting hole 21b is formed. The portion 21c extends through the upper and lower journal support walls 12a, 13a and projects into the generator room 20.
The fitting hole 21b is fitted to the tapered shaft end 15d of the fifth and fixed with the bolt 24 and the washer 25. On the inner peripheral surface of the concave portion 21a of the rotor 21, five permanent magnets 26 are provided.
Is fixed.

The inner peripheral surface of the annular stator 22 is fixed to a stator support 18a projecting from the inner wall surface of the generator cover 18. The stator 22 includes a core 27 in which a large number of iron plates whose surfaces are coated and insulated are laminated, side plates 28, 28 superposed on both side surfaces of the core 27, and the core 27 and the side plates 28, 28 are integrally joined. Rivet 29 ..., core 27 and side plate 2
18 coils 30 wound around the outer periphery of 8, 28;
And a harness 31 drawn from the coil 30.

The lower crankcase 13 is provided with a main gallery 32 to which oil is supplied from an oil pump (not shown) driven by the crankshaft 15. The main gallery 32 supports the journal of the lower crankcase 13. Oil passage P formed in wall 13a
1 and an oil passage P2 surrounding the bearing metal 14, lubricating the journal 15a of the crankshaft 15, and then lubricating the large end of the connecting rod 16 through oil passages P3 to P5 formed inside the crankshaft 15.

An oil passage P6 formed at the downstream end of the main gallery 32 through the orifice 33 and an oil passage P7 formed below the generator cover 18 straddle the lower crankcase 13 and the generator cover 18. Is connected via the joint 34 mounted on the base. Oil passages P8, P9 following oil passage P7 of generator cover 18
Extends above the generator cover 18, and an oil jet 35 is formed at the downstream end of the oil passage P <b> 9 and opens in the upper inner surface of the generator chamber 20. The oil jet 35 is the rotor 21
And the gap α in the upper part of the stator 22.

When the crankshaft 15 rotates the rotor 21 of the generator 23 with the operation of the internal combustion engine E, the coils 30 of the stator 22 fixed to the generator cover 18 and the permanent magnets fixed to the rotor 21 Electric power is generated by the relative rotation of the magnets 26. When the coils 30 generate heat with the power generation, the temperature of the rotor 21 rises, and the temperature of the upper portion of the rotor 21 becomes particularly high because the heated air rises.

In order to cool the rotor 21 whose temperature has increased in this way, the orifice 3
3. The oil supplied via the oil passage P6, the joint 34 and the oil passages P7 to P9
Eject from 5. As shown in FIG. 4 (A), the ejected oil collides with the upper inner wall surface of the concave portion 21a of the rotor 21 passing through the gap α between the rotor 21 and the stator 22, and is repelled there to form a mist. The oil falls on the upper part of the stator 22 and effectively cools the upper coils 30. As shown in FIG. 4B, while the oil that has cooled the upper coils 30 drops by gravity, the upper and lower coils 30 are cooled. Further, as shown in FIG. 4C, the oil that has dropped to the lower part of the rotor 21 is repelled by the rotor 21 and is reused for cooling the coils 30.

The temperature of the core 27 and the rotor 21 of the stator 22 of the generator 23 also rises due to the heat generated by the coils 30. However, these members are naturally cooled by oil. And the oil that has finished cooling the generator 23
The oil is returned to an oil pan (not shown) formed at the bottom of the lower crankcase 13 through an oil return passage 36 (see FIG. 1) extending obliquely downward from the lower end of the generator room 20.

As described above, the end of the main gallery 32 connected to the oil pump is branched into the oil passage P1 extending toward the crankshaft 15 and the oil passage P6 extending toward the generator 23, and the oil for lubricating the crankshaft 15 is provided. Since the generator 23 is cooled with oil of another system, the oil amount and the oil pressure of the oil for cooling the generator 23 are arbitrary compared to the case where the generator 23 is cooled with oil after lubrication of the crankshaft 15. Is easy to set.

The oil jet 25 jets oil to the upper inner peripheral surface of the concave portion 21a of the rotor 21 through the gap α between the rotor 21 and the stator 22. Can be effectively cooled by making uniform contact with the coils 30 on the upper part of the stator 22, which is apt to become cold. Moreover, the stator 2
2 is held in the recess 21a of the rotor 21 and falls down by gravity, while contacting with the center and lower coils 30 and the rotor 21. The whole can be cooled more effectively.

Next, a second embodiment of the present invention will be described with reference to FIG.

In the first embodiment, the stator 22 of the generator 23 is
Are fixed to the generator cover 18, but in the second embodiment, the stator 22 is fixed to annular stator supports 12b, 13b extending from the journal support walls 12a, 13a of the upper crankcase 12 and the lower crankcase 13. I have. Correspondingly, the rotor 21 fixed to the shaft end 15d of the crankshaft 15 has its concave portion 21a
Are open axially inside the crankshaft 15 (on the upper crankcase 12 and the lower crankcase 13 side).

The generator cover 18 has no oil passage, and an oil passage P10 for cooling the generator 23 and an oil jet 35 are formed in the upper crankcase 12. That is, the oil passage P1 extending upward from the main gallery 32 inside the lower crankcase 13 is connected to the oil passage P10 extending above the upper crankcase 12 via the oil passage P2 surrounding the outer periphery of the journal 15a of the crankshaft 15. . This oil passage P1
An orifice 33 is provided at an intermediate portion of 0, and an oil jet 35 is formed at an end portion of the rotor 21 and the stator 22 so as to point toward the gap α in the upper portion.

According to the second embodiment, the same operation and effect as those of the first embodiment can be exerted to effectively cool the stator 22 of the generator 23, and an oil passage is formed in the generator cover 18. Since there is no need, it is possible to contribute to a reduction in processing cost.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, in the embodiment, the generator 23 of the internal combustion engine E for a motorcycle has been described. However, the present invention can be applied to a generator of an internal combustion engine for any other use.

[0037]

As described above, according to the first aspect of the present invention, the cooling oil spouted from the oil jet passes through the gap between the inner peripheral surface of the recess of the rotor of the generator and the stator. , So that the mist-shaped oil that collides with the inner peripheral surface of the concave portion of the rotating rotor uniformly contacts the stator, thereby effectively cooling the coil provided on the stator. The cooling effect can be further enhanced by holding the oil in the recess of the rotor to be housed.

According to the invention described in claim 2,
Since the oil jet is directed to the gap on the upper side of the rotor, the oil can be brought into contact mainly with the coil on the upper part of the stator where the temperature tends to be the highest, so that the cooling effect can be enhanced.

According to the invention described in claim 3,
An oil jet is provided in the oil passage that branches directly from the main gallery of the internal combustion engine, so the oil that is passed from the main gallery to each oil jet after passing through each lubricated part of the internal combustion engine is supplied to the oil jet. It is possible to arbitrarily set the amount of oil and the oil pressure to be used.

According to the invention described in claim 4,
Even if the concave portion of the rotor faces outward in the axial direction of the crankshaft, oil can be injected into the concave portion of the rotor through the gap between the rotor and the stator by providing the oil jet on the generator cover that covers the rotor. .

According to the invention described in claim 5,
Even when the concave portion of the rotor faces inward in the axial direction of the crankshaft, oil can be injected into the concave portion of the rotor through the gap between the rotor and theta by providing the oil jet on the crankcase wall. In addition, since it is not necessary to form an oil passage for supplying oil to the oil jet in the generator cover, the processing cost of the generator cover can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a generator for an internal combustion engine.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a view in the direction of arrows in FIG. 1;

FIG. 4 is an explanatory diagram of an operation.

FIG. 5 is a view corresponding to FIG. 1 according to a second embodiment of the present invention.

[Explanation of symbols]

 12 Upper Crankcase (Crankcase) 13 Lower Crankcase (Crankcase) 15 Crankshaft 15d Shaft End 18 Generator Cover 21 Rotor 21a Concave 22 Stator 32 Main Gallery 35 Oil Jet E Internal Combustion Engine P9 Oil Passage P10 Oil Passage α Gap

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Naoki Murasawa, 1-4-1 Chuo, Wako City, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Naofumi Matsuo 1-4-1, Chuo, Wako City, Saitama Prefecture No. F-term in Honda R & D Co., Ltd. (Reference) 5H607 AA02 AA12 BB02 BB07 BB14 BB17 BB26 CC01 CC05 DD01 DD02 FF24 JJ05 5H609 BB03 BB13 PP02 PP07 QQ05 QQ20 RR01 RR30 RR37 RR42 RR48 RR71

Claims (5)

[Claims] 1. A crankshaft (1) for an internal combustion engine (E).
5) A rotor (21) fixed to the shaft end (15d) and rotating, and a stator (22) opposed to the inner peripheral surface of the recess (21a) of the rotor (21) with a gap (α) therebetween. A generator for an internal combustion engine, comprising: an oil jet (35) for injecting cooling oil to the rotor (21) through the gap (α). 2. The oil jet (35) is connected to a rotor (2).
2. The generator for an internal combustion engine according to claim 1, wherein the gap (α) on the upper side of 1) is directed. 3. The power generator for an internal combustion engine according to claim 1, wherein the oil jet (35) is provided in an oil passage (P9, P10) branched directly from a main gallery (32) of the internal combustion engine. Machine. 4. A shaft end (1) of a crankshaft (15) having a concave portion (21a) facing outward in the axial direction.
5d) and the stator (22) is fixed to the rotor (21).
The generator for an internal combustion engine according to claim 1, wherein the oil jet (35) is fixed to an inner surface of a generator cover (18) that covers the generator cover, and the oil jet (35) is provided on the generator cover (18). 5. A rotor (21) having a concave portion (21a) facing inward in the axial direction and a shaft end (1) of a crankshaft (15).
5d), wherein the stator (22) is fixed to the outer wall surface of the crankcase (12, 13), and the oil jet (35) is provided on the crankcase (12, 13). 2. The generator for an internal combustion engine according to 1.