JPH0229844B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement of a case-housed engine generator in which an air-cooled engine, a generator, and auxiliary equipment are housed in a case.

(Prior art) Case-housed engine generators have been widely used in the past, but in conventional case-housed engine generators, the electrical components for the generator are relatively sensitive to heat.
It is usually placed in a low-temperature part away from high-temperature parts such as the engine and muffler, and covered with a heat insulating material.

For this reason, there is a problem that the space inside the case cannot be used effectively, that the external shape of the case becomes unnecessarily large, and that the number of parts increases due to the heat insulating member.

(Objects of the Invention) An object of the present invention is to solve the above-mentioned problems and to provide a case-housed engine generator that can effectively cool electrical components that are relatively sensitive to heat.

(Structure of the Invention) The present invention provides a case-housed engine generator in which an air-cooled engine, a generator, and auxiliary equipment are housed in a case having a substantially rectangular external shape. A generator is placed on the side, and a cylindrical cover is provided to cover the outside of the generator.
A cooling fan for cooling the generator is arranged on the engine side part of the cover, and the end face of the cylindrical cover facing the case side plate is brought into close contact with the case side plate, so that cooling air flows in from the louver of the case side plate. This is a case-housed engine generator featuring the following features:

(Example) In FIG. 1 showing a case-housed engine generator to which the present invention is applied, 2 is a case, and the case 2, which has an approximately rectangular external shape, accommodates an engine, a generator, and auxiliary equipment, which will be described later. has been done. Case 2
The upper part of the fuel tank 4 is exposed on the upper surface of the
A handle 6 is provided above the fuel tank 4. A fuel filler port 8 and an oil level gauge 10 are provided on the front side of the upper surface of the fuel tank 4 .

The front panel 12 of the case 2 includes a front panel 14 and an air cleaner cover 1 necessary for operation and maintenance.
6, starter handle 18, lubricating oil filler port 20
(In both cases, the operation parts) are arranged in a concentrated manner.

As shown in FIG. 2, the case 2 includes a front plate 12, a rear plate 22, a right side plate 24, a left side plate 26, and a bottom plate 2.
8 are assembled with screws into a substantially rectangular parallelepiped shape with an open top, and the top opening is covered with the fuel tank 4. An opening 30 is provided at the top of the front panel 12 for attaching the front panel 14.
An opening 31 for the starter handle 18, an opening 20a for the lubricating oil filler port 20, and a louver 12a are formed in the lower part. Louvers 2 are also installed on the rear panel 22, right panel 24, and left panel 26, respectively.
2a, 24a, and 26a are formed. Bottom plate 2
8 is provided with an annular projection 32 for mounting an engine and a generator, and a mounting leg 34 is positioned on the annular projection 32 and fixed with a bolt 34a. The mounting bolts 34 are tightened from the bottom side of the bottom plate 28. A tool attachment hole 38 is provided in the bottom plate 28, and the head 40a of the tool 40 is fitted into the cap 38b which is fitted into the protrusion 38a of the tool attachment hole 38, and the tool 40 can be attached and detached using the attachment rubber 42. It is installed. Further, legs 44 are fixed to the bottom surface of the bottom plate 28.

In FIG. 3, which is seen from the front with the front panel 12 removed from the case-housed engine generator in the assembled state, the engine 4 is located in the lower central part of the fuel tank 4.
6 is placed. The engine 46 is, for example, a side valve type single cylinder gasoline engine.
The cylinder portion 6 is covered with a plate-shaped bracket (not shown) that serves as an engine cover.
A generator 50 is provided on one side of the engine 46, that is, the right side in FIG. 3, and the generator 50 is connected to the output shaft of the engine 46.

As shown in FIGS. 3a and 3b, a centrifugal fan 5 is mounted on the engine 46 side of the rotating shaft 50a of the generator 50.
0b is provided, and the coil 50c and iron core 50
It has the function of cooling d. A voltage regulator 50e, a rectifier 50f, etc. (electrical components) are housed in the part facing the right side plate 24 inside the cover 50g of the generator 50, and a gasket 5 is housed on the outer surface of the cylindrical cover 50g.
0h is fixed, and the packing 50h is closely attached to the right side plate 24 and the louver 24a (Figures 2 and 3)
The air sucked in by the centrifugal fan 50b is guided into the cover 50g.

A fan cover 52 is provided on the other side of the engine 46, that is, the left side in FIG. 3, and a centrifugal fan (cooling fan) is housed in the fan cover 52. Further to the left of the fan cover 52, a carburetor 54 and a recoil starter 56 are arranged.

The fuel tank 4 shown in FIG. 3 is provided with an air breather 4a, and vinyl tubes 4c are fitted into the air breathers 4a through connection pipes 4b having a narrow inner diameter of, for example, about 2 mm.
The vinyl tubes 4c are arranged side by side inside the handle 6, and their ends are open to the atmosphere.

In FIG. 4, seen from above with the fuel tank 4 and handle 6 removed from the case-housed engine generator in the assembled state, the generator 50 and the fuel tank 4 are shown.
A muffler 58 is arranged in a space on the rear plate 22 side between the two. An exhaust pipe 59 is connected to the muffler 58, and an exhaust port 60 of the muffler 58 is provided on the right side. A spark prevention pipe (not shown) made of wire mesh is provided at the exhaust port 60 of the muffler 58 to prevent discharge of sparks.

As shown in FIG. 3, the upper cover 62 has a gap 63 between it and the fuel tank 4, and an opening 62a.
A portion of the cooling air generated by the centrifugal fan 52a flowing out from the fuel tank 4 flows into the gap 63, and the fuel tank 4
This prevents the heat from reaching high temperatures. Gap 63
The cooling air from the centrifugal fan 52a and the centrifugal fan 50b of the generator 50 are exhausted from the louver 22a of the rear plate 22 to the outside. It's getting old.

In the space surrounded by the generator 50, silencer 58, and fuel tank 4, there are an AC outlet, a voltmeter, a DC outlet, a breaker, a pilot lamp, an oil warning lamp, etc. (all not shown) attached to the panel 14. It is accommodated. Further, the front panel 14 is formed with a Hertz switching window, an inverted L-shaped groove, and an opening (none of which are shown). A knob for engine operation is provided in the inverted L-shaped groove, and the engine is operated by operating the knob.

As shown in FIG. 4, the carburetor 54 is connected to an intake pipe 68 bent in a substantially U-shape.
An air cleaner 70 is attached to the. A rod 54c is connected to a throttle valve lever 54a of the carburetor 54 via a tension spring 54b, and the rod 54c is connected to a governor lever 72. Chewing valve lever 54d of carburetor 54
A chiyoke lever 54e is connected to the chiyoke lever 54e, and the tip of the chiyoke lever 54e is exposed from the front plate 12.

These intake devices include a gasket and an insulator on the flange of the intake pipe 68, and a through bolt 70b between the carburetor 54 and the air cleaner 70 via a carburetor support plate and gasket as shown in FIG.
The penetrating bolt 70b protruding into the air cleaner 70 has a center bolt 70c.
are screwed together, and the tip of the center bolt 70c has a perforated plate 70d, an air cleaner element 70e,
Bolts 70 fixing the air cleaner cover 16
g are screwed together. The air cleaner cover 16 is located in the opening of the front panel 14, and the air intake hole 70h of the air cleaner 70 opens inward.

As shown in FIGS. 3 and 4, the fan cover 5
A urethane seal 74 (dividing member) is provided around 2. Urethane seal 74 is case 2
As shown in FIG.
is fixed to. Therefore, urethane seal 7
Air from the engine 46 and muffler 58 sides, which are at high temperatures, does not flow into the space separated by 4 on the intake device side. Note that the tension spring 54b
The passage portion is separated by a gap between urethane seals 74 (FIG. 4).

As shown in FIG. 6, a governor mechanism 76 is provided on the rear surface of the engine 46. The governor mechanism 76 includes a governor gear 76a, a link 76b, a thruster 76c, a governor shaft 76d, etc.
The movement of the governor weight 76e of the governor gear 76a due to centrifugal force is controlled by the link 76b and the slider 76.
c functions to convert the rotation of the governor shaft 76d. The governor shaft 76d projects toward the rear side of the engine 46. Note that 46a is a side cover of the crankcase, and 46b is a camshaft.

The engine control section will be described with reference to FIG. 7, which shows the engine 46 viewed diagonally from above on the rear side. The governor shaft 76d is the rotation center 7 of the governor lever 72.
2a, and the lower end of the governor lever 72 is connected to a regulator 72c by a tension spring 72b. The regulator 72c is rotatably attached to the engine 46 with a bolt 72d. One end of a connection wire 72e is connected to the regulator 72c, and the connection wire 72e is connected to the engine 4.
6 and extends to the front side of the engine 46. There is a bracket 7 on the front side of the engine 46.
8, a control lever 80, a control shift lever 82, etc. are attached. The control lever 80 is rotatably attached to the bracket 78 with a mounting bolt 80a, and the other end of the connecting wire 72e is connected to the wire connecting portion 80b of the control lever 80. A locking portion 80c is formed on the control lever 80, and a locking portion 78a of the bracket 78 and a locking portion 80 are formed on the control lever 80.
A tension spring 80d is stretched between the spring 80c and the spring 80d. The tension spring 80d is disposed on the right side of the mounting bolt 80a in the assembled state shown in FIG. 3, and biases the control lever 80 in a direction to rotate the control lever 80 to the right about the mounting bolt 80a.

The bracket 78 is formed with a limit switch mounting plate 78b and a sub-bracket 78c. A protrusion 82a of a control shift lever 82 is slidably attached to a long hole 80e of the control lever 80. A stepped portion 82b is formed at the lower part of the control shift lever 82, and a protrusion 82c is also provided at the upper front surface. Protrusion 82
c fits into the inverted L-shaped groove of the front panel,
The knob for operating the engine is fixed to the protrusion 82c protruding from the front surface.

Further, as shown in FIG.
a are connected. The fuel tank 84 is provided with a fuel filter 84b.
is a pipe 84c through which fuel flows from the fuel tank 4.
and a pipe 84d are connected. Furthermore, a Hertz switching bolt 86 is fixed to the sub-bracket 78c of the bracket 78 with a nut 86a so that its position can be adjusted, and has the function of regulating the end position of the control lever 80, which is rotated to the right by a tension spring 80d. Hatasu. A limit switch 78d is attached to a limit switch attachment plate 78b of the bracket 78. The limit switch 78d has the function of opening and closing the ignition circuit of the igniter 57.

Next, the operation will be explained. During operation of the case-housed engine generator as described above, the rotating shaft 50a of the generator 50 is rotationally driven by the rotation of the engine 46, and the centrifugal fan 50b (cooling fan) cools the low-temperature air outside the case 2. Suction into the cover 50g. Since a voltage regulator 50e, a rectifier 50f, etc. are housed in the portion of the cover 50g facing the right side plate 24, the voltage regulator 50e and the rectifier 50f are cooled by the cooling air sucked in by the centrifugal fan 50b.
Voltage regulator 50e and rectifier 50f, which are relatively heat-resistant
Even if it is integrated with the generator 50, the voltage regulator 50
e. The rectifier 50f is not damaged. At this time, since the cover 50g is provided with a gasket 50h, the high temperature air inside the case 2 does not flow into the cover 50g, and only the low temperature air from outside flows into the louver 24a of the right side plate 24 (Fig. 2). Since the air is sucked into the cover 50g, the cooling efficiency is further improved.

(Effect of the invention) As explained above, according to the present invention, case 2
An engine 46 is arranged in the center, a generator 50 is arranged on one side of the engine 46, a cover 50g is provided to cover the outer surface of the generator 50, and a centrifugal fan 50b for cooling the generator is arranged inside the cover 50g. Electrical components such as a voltage regulator 50e and a rectifier 50f are provided on the part of the cover 50g facing the right side plate 24, and the end face of the cover 50g facing the right side plate 24 is brought into close contact with the right side plate 24. Louver 24
Since the cooling air is allowed to flow in from a, the end wall covering the electrical components can be omitted from the cover 50g, and the generator 50 and the electrical components of the generator 50 can be integrated, and the space inside the case 2 can be saved. This can be effectively used to reduce the size of the case-housed engine generator.

Voltage regulator 50e and rectifier 5 inside cover 50g
Since 0f is rapidly cooled by the cooling air sucked in by the centrifugal fan 50b, even if the generator 50, voltage regulator 50e, and rectifier 50f are integrated, the voltage regulator 50e and rectifier 50f will not be damaged by heat. can be prevented.

Moreover, since the cover 50g and the right side plate 24 are in close contact with each other, the high temperature air inside the case 2 does not flow into the cover 50g, and only the low temperature air from outside flows into the cover 50g. The cooling efficiency of 50f can be improved.

Further in accordance with the invention, an engine 46 and a generator 50
The fuel tank 4 is disposed on the upper side of the engine 46 and the generator 50 over substantially the entire length thereof, and the fuel tank 4
Since the silencer 58 is placed horizontally between the generator 50 and the generator 50, it is possible not only to suppress the increase in size of the small portable engine generator and to ensure sufficient capacity of the fuel tank 4, but also to ensure that the generator 50 is By utilizing the fact that the overall height is lower than that of the engine 46, there is an advantage that the muffler 58 can be arranged comfortably while keeping the lower surface of the fuel tank 4 substantially flat. Further, as shown in FIG. 3b, the hollow part inside the cover 50g that houses electrical components such as the voltage regulator 50e is connected to the louver 24.
Since the cover 50g is covered with the right side plate 24 (FIG. 2) having a diameter of 1.a, the end wall can be omitted from the cover 50g, reducing the number of parts and increasing the cooling effect of the electrical components.

(Other Examples) The cover 50g and the right side plate 24 are packed in 50h.
The contact is not limited to being brought into close contact with each other, but may be brought into close contact with other means such as metal contact.

[Brief explanation of drawings]

Fig. 1 is an external perspective view of a case-housed engine generator to which the present invention is applied, Fig. 2 is an exploded perspective view of the case, and Fig. 3 is a front view of the case-housed engine generator with the front plate removed. Figure 3a is a partially cutaway front view of the generator, Figure 3b is a view taken in the direction of the arrows in Figure 3a, and Figure 4 is a plan view of the case-housed engine generator with the fuel tank removed. 5 is a cross-sectional view taken from FIG. 3, FIG. 6 is an exploded perspective view showing the banner mechanism, and FIG. 7 is an exploded perspective view of the engine control section. 2... Case, 4... Fuel tank, 6... Handle, 12... Front plate, 14...
Front panel, 46... Engine, 52a... Centrifugal fan, 58... Silencer, 50... Generator, 50
a...Rotating shaft, 50b...Centrifugal fan, 50c...
...Coil, 50d...Iron core, 50g...Cover,
50h...Patzkin, 50e...Voltage regulator, 5
0f... Rectifier, 58... Silencer, 54... Carburetor, 56... Recoil starter, 74... Urethane seal.

Claims (1)

[Claims] 1. In a case-housed engine generator in which an air-cooled engine, a generator, and auxiliary equipment are housed in a case having a substantially rectangular external shape, the air-cooled engine is placed inside the case, the generator is placed on one side of the engine,
A fuel tank is placed above the engine and generator, spanning almost the entire length of the engine and generator, and a silencer is placed horizontally between the fuel tank and the generator. A cooling fan for cooling the generator is arranged on the engine side part of the cover, and the end face of the cylindrical cover facing the case side plate is brought into close contact with the case side plate, and cooling air is introduced from the louver of the case side plate. 1. A case-housed engine generator, characterized in that the electrical components of the generator are provided in a cavity formed by the inside of a cylindrical cover that covers the outer surface of the generator and a case side plate.