JP2001258209A - Cooling equipment of generator for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool a coil arranged in a generator chamber effectively and uniformly by using oil of an engine. SOLUTION: This generator for an engine is equipped with a stator 7 with coil and a cup type rotor 6 surrounding the outer periphery of the stator 7 with coil in a generator chamber 4. Oil channels 20, 21 that communicate with an oil gallery 17 of the engine are formed on a generator chamber forming wall. A plurality of oil exhaust nozzles 25, 26 are formed in the oil channels 20, 21. Both of the exhaust nozzles 25, 26 are preferably formed in a generator cover 2. The first oil exhaust nozzle 25 spouts oil toward a radial direction part inner than the coil 10. The second oil exhaust nozzle 26 spouts oil toward a radial direction outer part. The first exhaust nozzle 25 and the second exhaust nozzle 26 are opened toward the lower part and the upper part of the coil 10 which is positioned at the uppermost end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system for an engine generator that actively cools the engine generator with oil.

[0002]

2. Description of the Related Art Generally, a generator for an engine has a rotor and a stator with a coil disposed in a generator chamber. However, since heat is generated during operation, a cooling device is usually provided to prevent a decrease in power generation efficiency. ing. As a cooling device, there are an air cooling type and a liquid cooling type, and a liquid cooling type using oil has a better cooling effect, especially in a closed type generator which is directly connected to an engine and operated, the above-mentioned oil is used. A cooling device is employed.

A conventional oil-type cooling device has a structure in which oil for cooling a crankshaft is used and oil is injected from the center of the crankshaft through a boss of a rotor into a generator chamber. The temperature distribution varies between the inside and outside directions, and the difference in the vertical injection distance due to the effect of gravity causes a variation in the temperature distribution between the upper and lower coils, making it difficult to uniformly cool the entire generator. Met.

[0004] In contrast to the above cooling device, the present applicant has developed a cooling device described in Japanese Patent Application Laid-Open No. H10-210711 as a cooling device for reducing variation in temperature distribution between upper and lower coils. As shown in FIG. 4, the cooling device has an oil outlet 51 formed on an end wall of the crankcase 1, and the oil outlet 51 is connected to a rotor 6 fixed to the crankshaft 3 in the generator chamber 4. Open toward an annular space S3 formed between the cylindrical peripheral wall 6c and the cylindrical inner peripheral surface 2c of the generator cover 2, and
It is arranged at a position (height) corresponding to the uppermost end of the annular space S3. According to this structure, the oil injected into the annular space S3 from the oil outlet 51 circulates in the annular space S3 by the rotation of the rotor 6, and is sprayed to the coil 10 of the coiled stator 7 in the course of the circulation. . Thereby, the dispersion area of the temperature of the upper and lower coils 10 is reduced over the entire area of the generator where the oil is sprayed.

[0005]

However, in the structure shown in FIG. 4, basically, an oil outlet 5 formed at one position at the upper end is provided.
According to 1, since the oil is ejected to the radially outer portion of the rotor 6, it is difficult to eliminate the variation in the temperature distribution of the coil 10 in the radially inner and outer portions. In addition, even if the temperature distribution between the upper and lower coils 10 is uneven, it is difficult to sufficiently solve the problem only by ejecting oil from one location.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to make it possible to uniformly and efficiently cool the entire coil with a small amount of oil, regardless of the radially inner and outer portions of the coil and the upper and lower portions. An object of the present invention is to provide an engine generator cooling device whose specifications can be changed so as to be adapted to the generator.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present application provides the following in the generator room:
In a cooling device for an engine generator having a stator with a coil and a rotor surrounding the outer circumference of the stator with a coil, an oil passage communicating with an oil gallery of the engine is formed in a generator chamber forming wall surrounding the generator chamber. It is characterized in that a plurality of oil ejection ports for ejecting oil are formed in the passage. As a result, a plurality of locations for supplying oil can be selected, and oil can be simultaneously ejected toward the plurality of locations, so that the entire coil can be efficiently cooled.

According to a second aspect of the present invention, in the cooling device for an engine generator according to the first aspect, the first oil outlet for discharging oil toward a radially inner portion of the coil is provided as an oil outlet. And a second oil ejection port for ejecting oil toward a radially outer portion of the coil. Thereby, the cooling can be performed uniformly with a small amount of oil regardless of the inside and outside of the coil in the radial direction.

According to a third aspect of the present invention, in the cooling device for an engine generator according to the second aspect, the first oil outlet and the second oil outlet are formed in a lower portion and an upper portion of a coil located at an upper end portion. It is characterized in that it is open toward each part. This allows, as described above,
The entire coil can be uniformly cooled regardless of whether it is inside or outside in the radial direction and whether it is up or down.

According to a fourth aspect of the present invention, in the cooling device for an engine generator according to the first, second or third aspect,
The generator chamber forming wall is constituted by a part of the crankcase and a generator cover coupled thereto, and the first oil outlet and the second oil outlet are formed in the generator cover. Thus, even if the position of the oil outlet is forced to change due to, for example, a change in the specifications of the generator, it is not necessary to change the shape of the large component such as the crankcase, and the problem can be solved simply by changing the generator cover. Can save money.

According to a fifth aspect of the present invention, in a cooling system for an engine generator having a stator with a coil and a rotor surrounding the outer periphery of the stator with a coil in the generator chamber, the generator cover communicates with the oil gallery of the engine. The oil passage is formed in an oil passage portion in a peripheral wall formed on an outer peripheral wall of a cover surrounding the rotor in a radial direction and a cover end wall covering an axial end surface side of the rotor. It is characterized by comprising an oil passage portion in the end wall communicating with the oil passage portion in the peripheral wall, and an oil ejection port for ejecting oil is formed in the oil passage portion in the end wall. Thereby, the degree of freedom in selecting the position of forming the oil outlet increases, and the oil can be supplied to the most necessary part.

According to a sixth aspect of the present invention, in the cooling device for an engine generator according to the fifth aspect, as an oil passage formed in the generator cover, an extended oil passage extending to the coil side in communication with the oil passage portion in the end wall. And an oil ejection port is formed in the extended oil passage portion. Thus, it is possible to supply the oil to the desired lubrication point without waste and accurately.

[0013]

1 and 2 show an engine generator to which the present invention is applied. In FIG. 1, which shows a vertical cross section passing through the crankshaft center of the engine, FIG. Generator case 1a
Are integrally formed, and a generator cover 2 is attached to the generator case 1a with bolts, thereby forming a closed-type generator chamber 4. That is, the generator case 1 a and the generator cover 2 constitute a generator chamber forming wall surrounding the generator chamber 4.

In the generator chamber 4, a crankshaft 3 protrudes from the inside of the crankcase 1.
Rotor 6 fixed to the end of the
The generator with the coiled stator 7 secured to the generator.

The generator cover 2 is formed in a cup shape by a cover outer peripheral wall 2a surrounding the rotor 6 in the radial direction and a cover end wall 2b covering the axial end face side of the rotor 6.

The rotor 6 includes a boss 6a tapered and fixed to the crankshaft 3 by a key (not shown) and bolts 9, a disk 6b perpendicular to the crankshaft 3, and an outer peripheral end of the disk 6b. And a cylindrical peripheral wall 6c extending in the axial direction toward the cover end wall 2b side of the generator cover 2 from
It is formed in a cup shape and opens toward the cover end wall 2 b of the generator cover 2. A plurality of permanent magnets 14 are fixed to the inner peripheral surface of the cylindrical peripheral wall 6c at equal intervals in the circumferential direction.

The stator 7 with a coil is provided with a large number of outward magnetic projections on an annular main body, and a coil 10 is provided on each magnetic projection.
And a radially inner end portion is fixed to a mounting boss 8 formed on the cover end wall 2b of the generator cover 2 by a plurality of bolts 11. The outer end 7 b of the coiled stator 7 is connected to the permanent magnet 14 of the rotor 6.
, From the inside in the radial direction across the annular space S2.

A generator case (crankcase end wall) 1a has a bearing metal 3
A case-side oil passage 20 extending to the upper end portion through the outer periphery of 0 is formed, and a lower end portion of the case-side oil passage 20 communicates with an oil gallery 17 in the crankcase 1. The oil gallery 17 is an oil pump 1
In addition to the oil passage 20, the oil passage 5 communicates with each lubricating point in the crankcase 1, such as a crankshaft journal bearing metal 31.

The upper end of the case-side oil passage 20 is bent toward the generator cover 2 in parallel with the crankshaft center, and communicates with a cover-side oil passage 21 formed in the generator cover 2.

The cover-side oil passage 21 is formed at the upper end of the cover outer peripheral wall 2a, extends in the direction of the crankshaft center, and communicates with the case-side passage 20 in the peripheral wall oil passage portion 21.
a and the cover end wall 2b of the oil passage portion 21a in the peripheral wall.
An oil passage portion 21b in the end wall extending downward from the front end portion of the cover end wall 2b to the upper wall portion of the mounting boss portion 8 for the stator, and a mounting boss portion from the lower end of the oil passage portion 21b in the end wall. 8 includes an extended oil passage portion 21c extending in the direction of the crankshaft center to the vicinity of the coiled stator 7.

The leading end of the extended oil passage portion 21c is a first oil outlet 25, and the uppermost end of an annular space S1 formed between the inner end 7a of the coiled stator 7 and the rotor boss 6a. Open to the part. A second oil outlet disposed radially outward of the first oil outlet 25;
The oil outlet 26 is formed in the cover end wall 2b and communicates with the middle of the oil passage portion 21b in the end wall. As shown in FIG. 6 is open toward the uppermost end of the annular space S2 formed between the cylindrical peripheral walls 6c.

[0022]

In FIG. 1, the oil pump 15
Is supplied to each lubrication point in the crankcase 1, but a part of the oil passes through the case-side oil passage 20 of the generator case 1 a and is covered by the cover-side oil of the generator cover 2. The pressure is fed into the passage 21. In the cover-side oil passage 21, oil is pressure-fed to the end wall oil passage portion 21b through the peripheral wall oil passage portion 21a.
In the middle of the end wall oil passage portion 21b, the oil is ejected from the second oil outlet 26 toward the annular space S2 in parallel with the crankshaft 3, and the remainder is in the end wall oil passage portion 21b.
From the first oil outlet 25 toward the annular space S1 in parallel with the crankshaft 3.

From the first oil outlet 25 to the annular space S1
Of the oil jetted into the upper end of the coiled stator 7 is partially generated by centrifugal force caused by the rotation of the rotor boss 6a.
And the remainder reaches the disk wall 6b of the rotor 6, is guided radially outward by centrifugal force, and cools the stator 7 and the coil 10 from the radially inner side.

From the second oil outlet 26 to the annular space S2
Oil spouted to the uppermost end of the
In addition to supplementing the oil supply to the upper end portion of the coil, the rotor 7 rotates around the annular space S2 by the centrifugal force of the rotation of the rotor cylindrical peripheral wall 6c to cool the coiled stator 7 from the outside in the radial direction. Further, the oil from the first oil outlet 25 is prevented from leaking along the rotor end wall 6b and the cylindrical peripheral wall 6c.

In this embodiment, since both oil outlets 25 and 26 eject oil toward the uppermost ends of the corresponding annular spaces S1 and S2, a large amount of oil is provided above the coil. As a result, variations in the upper and lower temperature distributions are reduced.

[0026]

Other Embodiments (1) The embodiment shown in FIG. 3 is a cooling device for an engine generator having oil passages 20, 21 and oil outlets 25, 26 similar to those in FIG. This is a structure in which a plurality of cooling fins 35 protruding outward are formed on the wall 2b. According to this embodiment, in addition to cooling with oil, forced cooling with the cooling fins 35 exposed to the outside improves the cooling effect in the generator chamber 4 and also cools the oil in the cover-side oil passage 21.

(2) Instead of forming cooling fins as shown in FIG. 3 to improve the cooling effect, or together with forming the cooling fins, a jacket for cooling liquid (cooling water or cooling oil) is provided in the generator cover 2. The cooling effect can be further improved by forming a cooling fluid through the inside of the generator cover wall.

(3) In the embodiment of FIG. 1, one oil passage 20 on the crankcase 1 side and one oil passage 21 on the generator cover side are formed.
As described in the following (a), (b) and (c), a combination of a plurality of oil passages is also possible.

(A) In FIG. 1, as the cover-side oil passage 21, a single peripheral wall oil passage portion 21a is connected to a plurality of end wall oil passage portions 21b communicating therewith.
Are formed, and the extended oil passage portion 21c and the ejection ports 25 and 26 are formed in the oil passage portion 21b in each end wall. For example, when two oil passage portions 21b in the end wall are formed, the oil passage portions 21a in the peripheral wall at the upper end portion are formed.
The second end wall oil passage portion 21b also communicates with the second end wall oil passage portion 21b, and extends downward along a different path from the first end wall oil passage portion 21b. Oil is injected through the extended passage 21c or directly through the oil outlets 25, 26 and the like. Alternatively, as shown in FIG. 1, the second oil passage portion 2 in the end wall may cross the oil passage portion 21b in the first end wall extending substantially vertically downward so as to cross in the vicinity of the axis.
1b is formed in a horizontal direction (horizontal direction or the like), and a new extended passage portion 21c is formed in the oil passage portion 21b in the side wall.
, Or by directly forming the oil outlets 25, 26 and the like to inject the oil.

(B) Oil passage portions 21a, 21 in FIG.
A plurality (two or more) of cover-side oil passages 21 b and 21 c are formed, each forming an oil outlet, and communicating with the case-side oil passage 20. For example, the oil passage portion 21a in the peripheral wall at the upper end shown in FIG.
Separately, a second inner peripheral wall oil passage portion 21a is formed at the lower end of the outer peripheral wall 2a of the generator cover 2, and
The second peripheral wall oil passage portion 21a communicates with the middle of the case-side oil passage 20 and the second peripheral wall inner oil passage portion 21a is connected to an upwardly extending end wall inner oil passage portion 21b to form a new extension. The injection ports 25, 26 and the like are formed via the oil passage portion 21c or directly.

(C) A plurality of case-side oil passages 20 of FIG. 1 are formed, and connection ports from each case-side oil passage 20 to the cover-side oil passage 21 are opened at desired plural positions.
A cover-side oil passage 21 is connected to each opening.

(4) In the case where the invention described in claim 5 or 6 is applied, the number of oil outlets may be one.

(5) In the embodiment shown in FIGS. 1 and 2, both the first oil outlet 25 and the second oil outlet 26 are formed in the generator cover 2.
May be formed in the generator case 1a so that oil is injected into the coiled stator 7 through a hole formed in the disk wall 6b of the rotor 6.

(5) First and second oil outlets 25 and 2
6 is optimally formed at the uppermost end of each of the annular spaces S1 and S2 as shown in FIG. 2, but the position at which the first and second oil outlets 25 and 26 are formed is at the uppermost end. It is not limited to. However, in order to increase the cooling efficiency of the upper coil 10, it is preferable to form it at least above the crankshaft core.

(5) First and second oil outlets 25, 2
The number of 6 is not limited to one, and a plurality of 6 can be formed in one cover-side oil passage 21.

[0036]

(1) In the invention as set forth in claims 1 to 4, a cooling device for an engine generator provided with a stator 7 with a coil and a rotor 6 surrounding the outer periphery of the stator 7 with a coil in the generator chamber 4. In the generator chamber forming wall surrounding the generator chamber 4, oil passages 20, 21 communicating with the oil gallery 17 of the engine are formed, and a plurality of oil ejection ports 25, 26 for ejecting oil into the oil passages 20, 21. Is formed, oil can be simultaneously supplied to a plurality of locations by selecting a desired location, and the entire coil can be efficiently and uniformly cooled.

(2) According to the second aspect of the present invention, the first oil is injected toward the radially inner portion of the coil 10.
Is formed, and the second oil ejection port 26 for ejecting oil toward the radially outer portion of the coil 10 forms the coil 10 inward and outward in the radial direction. From both sides of the coil, and with a small amount of oil, uniform cooling can be performed both inside and outside the coil in the radial direction. Thereby, the performance reliability of the generator can be maintained, and the loss of engine efficiency due to the oil pump, stirring, and the like can be reduced.

(3) As in the third aspect of the present invention, the first
When the oil outlet 25 and the second oil outlet 26 are open toward the lower part and the upper part of the coil 10 located at the upper end, respectively, it is possible to secure a large amount of oil to the upper coil 10, The entire coil 10 can be uniformly cooled regardless of whether it is inside or outside in the radial direction and up and down.

(4) The generator chamber forming wall surrounding the generator chamber 4 is formed by a part of the crankcase and the generator cover 2 connected to the crankcase. When the generator cover 2 is formed on the generator cover 2, even if the position of the oil outlet is forced to change due to, for example, a change in the specification of the generator, it is not necessary to change the shape of the large member such as the crankcase. 2 can be dealt with only by changing, thereby saving costs.

(5) The oil passage 21 formed in the generator cover 2 according to the fifth and sixth aspects of the invention.
, A cover outer peripheral wall 2 a surrounding the rotor 6 in the radial direction.
And an end wall oil passage portion 21b formed on a cover end wall 2b that covers the axial end surface side of the rotor and communicates with the peripheral wall oil passage portion 21a. This increases the degree of freedom in selecting the formation position of the oil outlet 25 and the like. Even with a structure in which one oil outlet is formed, oil can be supplied to the most necessary parts, and the cooling effect can be reduced with a small amount of oil. Can be enhanced.

(6) As the oil passage 21 formed in the generator cover 2, an extended oil passage portion 21c communicating with the oil passage portion 21b in the end wall and extending to the coil side is formed. When the oil outlet 25 and the like are formed in the extended oil passage portion 21c, it is possible to supply oil to a desired lubrication point without waste and accurately.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of an engine generator to which the present invention is applied.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, showing a part of a stator with a coil, a rotor, and a crankshaft.

FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 crankcase 2 generator cover 2a cover outer peripheral wall 2b cover end wall 3 crankshaft 4 generator chamber 6 rotor 6a rotor cylindrical peripheral wall 7 stator with coil 10 coil 17 oil gallery 20 case-side oil passage 21 cover-side oil passage 21a inside peripheral wall Oil passage portion 21b Oil passage portion inside end wall 21c Extended oil passage portion 25 First oil outlet 26 Second oil outlet

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H605 AA01 BB03 BB10 BB17 CC01 DD03 DD09 DD12 5H609 BB05 BB13 BB19 PP02 PP05 PP06 PP09 PP11 QQ05 QQ12 QQ13 QQ16 QQ20 QQ23 RR06 RR16 RR37 RR42 RR43 RR63 RR67

Claims (6)

[Claims] 1. An engine generator cooling device having a stator with a coil and a rotor surrounding the outer circumference of the stator with a coil in the generator chamber, wherein a generator chamber forming wall surrounding the generator chamber communicates with an oil gallery of the engine. A cooling device for an engine generator, comprising: an oil passage formed in the oil passage; and a plurality of oil ejection ports for ejecting oil are formed in the oil passage. 2. The cooling device for an engine generator according to claim 1, wherein the first oil ejection port for ejecting oil toward a radially inner portion of the coil is provided as an oil ejection port. And a second oil ejection port for ejecting oil toward the first portion. 3. The cooling device for an engine generator according to claim 2, wherein the first oil outlet and the second oil outlet are respectively opened toward a lower portion and an upper portion of the coil located at the upper end. A cooling device for an engine generator, comprising: 4. The cooling device for an engine generator according to claim 1, wherein the generator chamber forming wall is constituted by a part of a crankcase and a generator cover coupled thereto, and wherein the first oil injection Exit and second
A cooling device for an engine generator, wherein the oil outlet of the engine is formed in a generator cover. 5. A cooling device for an engine generator having a stator with a coil and a rotor surrounding the outer periphery of the stator with a coil in a generator chamber, wherein an oil passage communicating with an oil gallery of the engine is formed in the generator cover. The oil passage is formed in a peripheral wall oil passage portion formed on a cover outer peripheral wall surrounding the rotor in the radial direction, and a cover end wall formed on an axial end surface side of the rotor and formed on the peripheral wall oil passage portion. A cooling device for an engine generator for an engine, comprising an oil passage portion in an end wall communicating with the oil passage portion, and an oil outlet for ejecting oil is formed in the oil passage portion in the end wall. 6. The cooling device for an engine generator according to claim 5, wherein an oil passage formed in the generator cover has an extended oil passage extending to the coil side in communication with the oil passage inside the end wall. An engine generator cooling device, wherein an oil outlet is formed in an extended oil passage portion.