JP2001295658A - Engine generator - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the cooling efficiency of an engine generator by dividing a cooling air passage into two systems. SOLUTION: An engine 2, a generator 3, a muffler 4, and a cooling fan 5 are housed and arranged in a housing. A first cooling air passage 36 is formed on the cylinder head 2a side of the engine 2. A second cooling air passage 37 is formed below the engine 2 from the leeward side of the cooling fan 5 to the muffler 4 under the engine 2. The second cooling air passage 37 is formed between the oil pan and the anti-vibration support substrate 6 and faces the oil pan. The cooling air from the cooling fan 5 is divided into two systems, the cooling air in the first cooling air passage 36 cools the cylinder head 2 a, and the cooling air in the second cooling air passage 37 connects the lower part of the engine 2 and the muffler 4. Is cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine generator having an engine and a generator driven by the engine, and more particularly to an engine generator for cooling an engine or the like by a cooling fan driven by the engine. About.

[0002]

2. Description of the Related Art As an electric power source for road construction, street vendors, outdoor leisure, and the like, a so-called engine generator, which obtains electric power by accommodating an engine and a generator driven by the engine in a housing, has been widely known. ing. In such an engine generator, a rotor on which a magnet is attached is fixed to a crankshaft, and the rotor is rotated near a stator having a generating coil to generate an electromotive force. Further, there is provided a cooling fan driven by the engine to cool the engine, the generator, the muffler, etc., and the cooling fan rotates with the rotation of the crankshaft to introduce cooling air into the housing. It is configured as follows.

Japanese Patent Application Laid-Open No. H11-36880 discloses an air-cooled engine generator using such a cooling fan in which the cooling efficiency is improved. In the device of the above publication, an outer rotor type generator is used as a generator, and a generator, an engine, and a muffler are arranged in this order in a housing, and these are covered with a duct and a fan cover. A cooling fan is attached to the outside of the outer rotor of the generator, and rotates with the crankshaft to introduce cooling air from outside the device. Then, the cooling air cools the generator having a relatively low temperature first, then cools the engine and the muffler having a high temperature in order, and is discharged to the outside.

[0004]

However, in the engine generator disclosed in the above publication, the muffler is cooled after the engine, so that the muffler is supplied with hot air after the engine is cooled. Become. Therefore, there is a problem that the cooling efficiency must be lower than when the muffler is cooled by the outside air.

An object of the present invention is to improve the cooling efficiency of the engine generator by dividing the cooling air passage into two systems, one for cooling the cylinder head of the engine and the other for cooling the oil pan and muffler. .

[0006]

An engine generator according to the present invention includes an engine, a generator driven by the engine, a muffler disposed on the exhaust side of the engine,
An engine generator comprising a cooling fan driven by the engine and housed in a housing, wherein the generator is formed on a cylinder head side of the engine and cools an upper portion of the engine by cooling air supplied from the cooling fan. A first cooling air passage formed below the engine;
A second cooling air passage that reaches from the leeward side of the cooling fan to the muffler through the lower side of the engine and cools the lower part of the engine and the muffler by cooling air supplied from the cooling fan; It is characterized by.

According to the present invention, the cooling air is divided into two systems, the cylinder head is exclusively cooled by the first cooling air passage, and the lower part of the engine and the muffler are cooled by the second cooling air passage. Therefore, the engine can be cooled up and down, and a cooling air having a lower temperature than that after cooling the cylinder head can be supplied to the muffler, and the cooling performance of the engine and the muffler can be improved.

[0008] In this case, the oil pan of the engine may be arranged facing the second cooling air passage, whereby the oil disposed below the engine by the cooling air flowing through the second cooling air passage. The bread can be cooled efficiently.

The second cooling air passage is formed between an oil pan of the engine and an anti-vibration support substrate attached to a lower side of the engine and extending along a direction in which a crankshaft of the engine extends. Thus, the second cooling air passage can be constructed by utilizing the engine supporting portion. Therefore, it is possible to provide a space-efficient and compact engine generator.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing an internal configuration of an engine generator according to an embodiment of the present invention when viewed from a side, and FIG. 2 shows a configuration when the engine generator of FIG. 1 is viewed from an X direction. FIG.

The engine generator 1 according to the present embodiment is a type of generator in which a generator is driven by an engine. An engine 2, a generator 3, a muffler 4, a cooling fan 5 and the like are arranged on a substrate 8. , Are housed in a housing (not shown). In the engine generator 1,
A cooling air passage (first cooling air passage) 36 for cooling the upper part of the engine 2 and a cooling air passage (second cooling air passage) 37 for cooling the bottom of the engine 2 and the muffler 4 are provided. The cooling efficiency of the muffler 4 is improved.

The engine 2 is a general-purpose diesel engine, and the rotation of the crankshaft 10 drives a generator 3 which is an outer rotor type multi-pole generator disposed on the right side of the engine 2 in FIG. On the other hand, the exhaust gas discharged from the engine 2 is sent to a muffler 4 arranged on the left side of the engine in FIG. 1, and after exhaust noise is reduced, the exhaust gas is discharged from an exhaust port (not shown) to the outside of the device. Is done.

The crankshaft 10 of the engine 2 includes:
A cooling fan 5 that also functions as a flyhole is fixed. Blades 5a project from the outer periphery of the cooling fan 5 toward the side opposite to the engine 2, and a bottomed cylindrical outer rotor 11 is further fixed to the tip of the blades 5a. Then, the cooling fan 5 rotates with the start of the engine, and as shown by the broken line, the fan cover 19
1, outside air is taken in from the right side in FIG. 1, and the cooling air is supplied toward the engine 2.

In the engine generator 1, the engine 2 is supported on a substrate 8 by a vibration-proof support substrate 6. The anti-vibration support substrate 6 includes a pair of left and right anti-vibration support plates 6a and a bracket 6b,
vibration-proof material (vibration-proof member) arranged between a and the bracket 6b
6c.

As shown in FIG. 2, one of the right and left vibration isolation support plates 6a is attached to the lower surface of both sides of the oil pan 7 of the engine 2 with the oil pan 7 interposed therebetween.
The bracket 6b is mounted on the substrate 8 at a position facing the anti-vibration support plate 6a. A vibration isolator 6c is interposed between the vibration isolator support plate 6a and the bracket 6b.

Here, the anti-vibration support substrate 6 is formed to have a dimension exceeding the length L1 of the engine 2 in the direction of extension of the crankshaft (the left-right direction in FIG. 1). That is, the length of the anti-vibration support substrate 6 is longer than the entire length of the engine 2 in the axial direction, and is formed to a length that extends from the inside of the fan cover 19 to the muffler 4.

The vibration isolator 6c is an elastic member made of rubber, synthetic resin, or the like, and is attached to the bracket 6b at both longitudinal ends of the vibration isolator support substrate 6. That is, the engine 2 is placed on the vibration-isolation supporting substrate 6 longer than the engine 2 and is supported at both ends by the vibration-isolating material 6c. This is because the support span of the engine 2 is
As shown in FIG. 1, the muffler 4
To the length L2.

Therefore, in the engine generator 1, the span between the supporting points can be made larger than when the engine is supported by the vibration isolating mount member provided directly below the engine. Therefore, the engine 2 can be received by the support structure having a long span, and the vibration of the engine 2 is
Transmission to the side can be efficiently suppressed.

Further, in the engine generator 1 according to the present invention, the cooling air passage 3 is
7 are formed. As shown in FIGS. 1 and 2, the anti-vibration support substrate 6 has a sectional shape such that a space is formed below the oil pan 7 of the engine 2. Therefore, this space is utilized as a cooling air passage 37 for cooling the engine 2 and the muffler 4, thereby improving the cooling performance.

As shown in FIG. 1, the cooling air passage 37 passes from below the outside of the cooling fan 5 to below the engine 2 and
It is formed by a gap reaching the lower side of the muffler 4. The lower surface of the oil pan 7 of the engine 2 faces the cooling air passage 37, as shown in FIG. Therefore, the cooling air sucked by the cooling fan 5 and sent in the centrifugal direction is
As shown in FIG. 1, a part thereof flows below the engine 2 and is supplied to the cooling air passage 37. The cooling air introduced into the cooling air passage 37 first cools the oil pan 7 and flows to the muffler 4 side. Then, the water flows toward the muffler 4 so as to spring up from the lower side of the muffler 4, cools the muffler 4, and is discharged out of the apparatus.

A cooling air passage 36 is also formed on the cylinder head 2a side of the engine 2. That is, in the engine generator 1 of the present invention, the cooling air is divided into two systems, one (via the cooling air passage 36) above the engine 2, and the other (via the cooling air passage 37) below the engine 2. And the muffler 4 are cooled.

The cooling air passage 36 is formed inside the fan cover 19 or an engine cover (not shown), and is formed by a gap extending from the upper outside of the cooling fan 5 to the upper side of the engine 2 to the upper side of the muffler 4. Thus, a part of the cooling air sent in the centrifugal direction by the cooling fan 5 flows above the engine 2 and is supplied to the cooling air passage 36 as shown in FIG. The cooling air introduced into the cooling air passage 36 cools the cylinder head 2 a of the engine 2,
It flows to the muffler 4 side. Then, it flows above the muffler 4 and is discharged out of the apparatus. In addition, the cooling wind is
When flowing through the upper part, the muffler 4 may also be cooled.

Here, the oil pan 7 is connected to the cylinder head 2.
Since the temperature is lower than a, the cooling air flowing through the cooling air passage 37 and supplied to the muffler 4 has a lower temperature than that after cooling the cylinder head. That is, in the above-mentioned publication, the hot air after the cylinder head is cooled is supplied to the muffler, whereas in the engine generator 1 of the present invention, the cooling air having a lower temperature is supplied. Therefore,
The muffler 4 can be cooled by lower-temperature cooling air, and it is possible to improve the cooling efficiency of the muffler 4 having the highest heat.

Further, as described above, in the engine generator 1, the cooling air passage 37 is formed by utilizing the structure of the vibration isolating support substrate 6. Therefore, it is possible to improve the cooling efficiency of the engine 2 and the muffler 4 while taking anti-vibration measures,
The effect of two birds per stone of vibration isolation and cooling can be obtained without increasing the number of parts.

On the other hand, the outer rotor 11 is attached to the cooling fan 5 with the side opposite to the engine 2 being open. A plurality of magnets 14 are mounted on the inner peripheral surface of the outer rotor 11 along the circumferential direction. Further, the stator 1 is provided inside the outer rotor 11.
2, the outer rotor 11 and the stator 12
Thus, the power generator 16 is formed.

As shown in FIG. 2, the stator 12 has a stator core 15 in which a power generating coil 13 is wound around a plurality of yokes radially protruding. Then, when the engine 2 is started, the outer rotor 11 rotates, and the magnet 14 rotates around the power generation coil 13 to generate an electromotive force in the power generation coil 13 to generate power.

The stator 12 is fixed inside the fan cover 19. For this reason, in the engine generator 1, the stator 12 can be replaced simply by removing the fan cover 19. That is, at the right end of the fan cover 19, as shown in FIG. 1, a stator mounting portion 17 protrudes toward the engine 2, and the stator 12 is moved into the fan cover 19 by the stator mounting portion 17. Fixed. Then, when the fan cover 19 is attached to the engine 2, the stator 12 is set so as to be inserted inside the outer rotor 11, and the generator 3 is formed.

Therefore, at the time of maintenance, if the fan cover 19 is removed in the opposite
Is naturally separated from the engine generator 1.
For this reason, the stator 12 can be replaced without removing other parts such as the outer rotor 11, so that maintenance can be improved and the number of work steps can be reduced.

When the fan cover 19 is attached to the engine 2, the entire power generator 16 is housed in the fan cover 19. For this reason, it is not necessary to hold the generator 3 by a plurality of housings, so that the number of parts can be reduced and the waterproofness can be improved.

Next, the electromotive force generated in the power generating coil 13 is sent to an inverter unit (not shown), converted into an alternating current having a predetermined frequency, and output from a control panel provided in the housing. When power is supplied after frequency conversion by the inverter unit, it is not necessary to keep the engine speed constant regardless of the size of the load in order to maintain the output frequency, and the engine 2 can be operated under optimal conditions as appropriate according to the load. . For this reason, it is possible to keep the engine speed lower than before, except at the time of a heavy load, and it is possible to reduce driving noise and improve fuel efficiency.

A recoil starter (not shown) is provided outside the fan cover 19. The crankshaft 10 is rotated by manually pulling a rope, and the engine 2 is started. .

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the embodiment and can be variously modified without departing from the gist of the invention. Needless to say,

For example, in the above-described embodiment, an example in which rubber or a synthetic resin is used as the vibration isolator 6c has been described, but a vibration isolator using a disc spring, a coil spring, or the like may be used instead. It is possible. Further, although the example in which the general-purpose diesel engine is used as the engine has been described, it goes without saying that a gasoline engine may be used instead.

[0034]

According to the engine generator of the present invention, cooling is provided by providing the first cooling air passage for cooling the upper part of the engine and the second cooling air passage for cooling the lower part of the engine and the muffler. The wind can be divided into two systems to cool the upper and lower portions of the engine, respectively, and to supply cooling air having a relatively low temperature to the muffler. Therefore, the cooling performance of the engine and the muffler can be improved, and the engine output can be improved and the mechanical life of the muffler can be extended.

By arranging the oil pan so as to face the second cooling air passage, the oil pan can be efficiently cooled by the cooling air flowing through the second cooling air passage, and the cooling efficiency of the engine is further improved. Can be done.

Further, by forming the second cooling air passage between the oil pan and the vibration isolating support board, the second cooling air passage can be constructed by utilizing the engine supporting portion. Therefore, two-system cooling can be achieved without increasing the number of parts, and a compact engine generator with good space efficiency can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an internal configuration when an engine generator according to an embodiment of the present invention is viewed from a side.

FIG. 2 is an explanatory diagram showing a configuration when the engine generator of FIG. 1 is viewed from an X direction.

[Explanation of symbols]

 Reference Signs List 1 engine generator 2 engine 2a cylinder head 3 generator 4 muffler 5 cooling fan 6 anti-vibration support substrate 8 substrate 10 crankshaft 36 cooling air passage (first cooling air passage) 37 cooling air passage (second cooling air passage) )

Claims (3)

[Claims] 1. An engine generator comprising an engine, a generator driven by the engine, a muffler disposed on the exhaust side of the engine, and a cooling fan driven by the engine in a housing. A first cooling air passage formed on a cylinder head side of the engine and configured to cool an upper part of the engine by cooling air supplied from the cooling fan; A second cooling air passage that reaches from the leeward side of the cooling fan to the muffler through the lower side of the engine and cools a lower part of the engine and the muffler by cooling air supplied from the cooling fan. Characteristic engine generator. 2. The engine generator according to claim 1, wherein an oil pan of the engine is arranged facing the second cooling air passage. 3. The engine generator according to claim 1, wherein the second cooling air passage is attached to an oil pan of the engine and a lower side of the engine and extends in a direction in which a crankshaft of the engine extends. An engine generator formed between the anti-vibration support substrate and the extended anti-vibration support substrate.