JPS59552Y2 - portable engine generator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a portable engine generator, particularly one that houses a small gasoline engine and a generator driven by the engine in a case.

This type of engine generator is used, for example, as a power source for a welding machine, and is desirably lightweight because it is often moved.

However, in the past, the case was made of steel, so the weight of the heavy steel plate case was added to the weight of the engine and generator, making the total weight of the engine generator bulky and heavy, making it difficult to move. It requires a lot of effort.

Furthermore, if the insulation structure for the case of an electrical system such as a generator is damaged, there is a risk of electrical leakage to the case.

In addition, although the engine's fuel tank is housed inside the case, the fuel tank becomes an obstacle to the cooling airflow of the engine, etc., which not only reduces cooling efficiency, but also causes the engine to become hot during operation. It is undesirable to store fuel tanks together in order to prevent fires.

Furthermore, fuel may leak into the case and accumulate on the bottom of the case mainly during refueling, and in this case, there is a risk that the fuel that has accumulated on the bottom of the engine will ignite during engine operation, causing a fire.

Therefore, it is necessary to specially provide a guide device inside the case to discharge the leaked fuel to the outside, which complicates the structure.

This invention was proposed in view of the various disadvantages of the above-mentioned conventional methods.
It has a box-shaped construction consisting of earthen walls, side walls, and a bottom plate made of low-density synthetic resin with high impact resistance and excellent heat insulation, reducing the total weight of the engine generator and preventing electrical leakage to the case. In addition, a deep recess that opens upward and to one side is formed on the upper wall of the case when the upper wall is formed.
By housing the fuel tank in the recess and fixing it by simple means, obstructions are removed from inside the case, creating a smooth flow of cooling air, improving the cooling efficiency of the engine, etc. The purpose is to provide a safe engine generator that eliminates problems such as fuel leakage.

An embodiment of the present invention will be described below with reference to the drawings.

In Figs. 1 to 6, 1 is a case made of synthetic resin such as FRP, and has an upper wall 2a with an open bottom, and side walls 2b to 6.
2e, a thin box-shaped bottom plate 6 that is fitted into the opening and fixed to the side wall with screws 3, and on which the engine 4 and generator 5 are placed. and an air exhaust hole 7, and the side wall 2b of the main body 2
Screw 8 on the outer surface of (the lower screw reaches the bottom plate 6).

) is attached to the exhaust muffler housing chamber 9,
Four wheels 10 are attached to the lower surface of the bottom plate 6 in the front, rear, left and right directions.
It can be moved by

- An engaging ring 11 of a hanging hook is provided at approximately the center of the outer surface of the earthen wall of the main body 2, and approximately half of the outer surface of the earthen wall of the main body 2 and a part of the outer surface of the side walls 2C, 2d are provided with the engaging ring 11 of the hanging hook. 11 to hole 12
The fuel tank 13 and the engine operation storage battery 16 are covered with a protective cover 17, which is inserted into the hole 15 and the fuel filler cap 14 of the fuel tank 13 is inserted into the hole 15.

In addition, an engine cooling air hole protection cover 18 is provided on the outer surface of the earthen wall of the main body 2 along with the cover 17.

A terminal plate surface 1 using the electrically insulating side wall is provided on the upper outer surface of the side wall 2e facing the exhaust muffler accommodation chamber 9 of the main body 2.
9, and a pair of cooling air intake holes 20 are provided at the lower part of the side wall 2e.

Further, a door 22 molded from the synthetic resin is provided on the lower outer surface of the side wall 2C of the main body 2 and can be opened and closed by a hinge 21, and the inside of the case can be inspected by opening the door 22.

A cooling air discharge hole protection cover 23 molded from the synthetic resin is provided on the lower surface of the bottom plate.

In particular, as shown in FIGS. 6 and 7, the engine 4 and the generator 5
are supported on the bottom plate via two and one seismic rubber 24 and 25, respectively, and the crankshaft 26 of the engine 4 is directly connected to the armature shaft 27 of the generator 5 (about the support structure of the engine 4 etc. will be described later.

). Therefore, when the engine 4 is operated, the armature 28 of the generator 5 is rotated by the crankshaft 26 to generate electricity.

At the same time, a fan 29 attached to the armature shaft 27 rotates, and the air diffused by the diffuser plate 20a facing the hole 20 is sent through the cooling air intake hole 20 of the side wall 2e of the main body 2 to the inside of the case, especially for power generation. After being sucked into the machine and cooling the inside, the warmed air is discharged to the outside through the discharge hole 30 of the bottom plate 6.

In addition, since the cooling fan 31 of the engine 4 also rotates, air is sucked into the main body through the cooling air hole 32 formed in the upper wall 2a of the main body 2, and the engine 4 is heated together with the air sucked by the fan 29 of the generator 5. Cooling, fan cover 3
The warmed air is guided into the exhaust muffler storage chamber 9 through the hole 34 of No. 3 and the hole 35 drilled in the side wall 2b of the main body 2, and after further cooling the muffler 36, the warmed air is discharged to the outside from the exhaust hole 7. .

As is clear from the state in which the protective cover 17 is removed in FIG. 8, the upper wall 2a of the main body 2 on the generator side has a U-shape in plan opening upward and to one side for accommodating the fuel tank 13. A deep recess 37 is formed at the same time as the main body.

The fuel tank 13 is configured in the shape of a box with a substantially rectangular plane, and has a series of substantially horizontal flanges 38 on its outer peripheral surface.
The edge of the flange facing the inner surface of the side wall 37a accommodated in the recess 37 and facing the side opening of the recess 37 is brought into contact with the inner surface of the side wall 37a.

A level gauge 39 is attached to the outer surface of the fuel tank facing one of the opposing side walls 37b, 37c of the recess 37.

FIG. 9 shows a fuel tank fixing member 4 made by bending a metal rod or pipe with a diameter smaller than the width of the flange 38 into a crank shape.
0, and consists of a U-shaped portion 41, long bent portions 42 provided at both ends of the U-shaped portion 41, and short bent portions 43 having threaded portions 43a at the ends.

The fixing member 4o connects the end of the long bent portion 42 to the recess 3.
7, and the end of the short bent portion 43 is loosely inserted into the hole 45 of the other side wall 37C so that each end protrudes into the main body 2.

The U-shaped portion 41 of the fixing member 4o is placed on the upper surface of the fuel tank flange 38 from the side opening side of the recess 37, and clamps the outer peripheral surface of the upper part of the fuel tank. Screw the nut 46 into the part 43a from inside the main body and tighten it to attach the fuel tank 13 to the nut side wall 37.
c, and the flange edge of the fuel tank 13 facing the inner surface of the side wall is brought into contact with the inner surface of the side wall, thereby fixing the fuel tank 13 in the recess 37.

Needless to say, the length of the long bent portion 42 of the fixing member 40 is set to such a length that the flange edge of the fuel tank 13 does not fall out of the hole 44 when it comes into contact with the inner surface of the side wall 37C.

The main body does not need to be formed into a complete box shape; it may be formed into a U-shaped cross section and have side walls attached to the openings facing each other to form a box shape, or each wall portion may be formed separately. , these may be combined to form a box shape as appropriate.

Further, the recess 37 that accommodates the fuel tank 13 may be open only upward.

When the main body 2 is made of the synthetic resin as described above, it is possible to reduce the weight of the case, improve impact resistance, and prevent electrical leakage to the case.

Further, it is easy to form a deep recess 37 in the upper wall 2a during molding, and the fuel tank 13 is housed in the recess to prevent fuel from leaking into the main body during refueling.
In addition, obstacles can be removed from within the main body to create a smooth flow of cooling air.

Further, by providing the recess 37 in the upper wall 2a on the generator side, heat conduction to the fuel tank 13 can be suppressed together with the heat insulation properties of the case itself.

Furthermore, by mixing an appropriate coloring agent into the synthetic resin, it is possible to omit painting the case, thereby saving costs and means.

The fuel tank 13 is held in the recess 37 by a fixing member 40 on the upper surface of the flange and on the side wall 37 of the recess.
Since the flange edge is brought into contact with b and 37C and fixed, it is fixed without falling from the side opening side of the recess or wobbling.

Furthermore, the fixing structure is simple.

As shown in FIGS. 8 and 11, the upper wall 2a of the main body 2 on the generator side has an upper and one side wall for fitting the storage battery 16 for engine operation at a position opposite to the storage recess 37 of the fuel tank 13. A deep concave portion 47 with a planar trigonometric shape opening to the main body is molded at the same time as the main body molding.

The upper edges of the opposing side walls of the recess 47 are each bent outward to provide a substantially horizontal step 48 .

The storage battery 16 has a translucent synthetic resin battery case, is fitted into the recess 47, and is covered and fixed by the protective cover 17.

The protective cover 17 is made of synthetic resin of the same material as the main body 2 and has a U-shaped cross section, and has a hook portion 49 at one bent edge, as shown in FIG.

Two hooks 50 are provided on the upper outer surface of the flange 38 of the fuel tank 13 located on the side opening side of the housing recess 37, and the protective cover 17 connects the hook portion 49 to the hook of the fuel tank 13. 50, the horizontal part covers the fuel tank 13, a part of the outer surface of the main body upper wall 2a, and the upper surface terminal part 16a of the storage battery 16, and a part of the inner surface of the other bent part 51 covers the storage battery 16. It is fixed to the upper outer surface of the side wall 2d of the main body 2 by a screw 52 by pressing the side surface located on the side opening side of the recess 47.

Furthermore, the storage battery side bent portion 51 of the protective cover 17 has a U-shaped notch 53, so that the amount of electrolyte in the storage battery 16 can be seen from the outside.

If the main body 2 is made of synthetic resin as described above, it is easy to form a deep recess 47 in the upper wall 2a during molding of the main body, and when the storage battery 16 is fitted into the recess 47, the electrolyte will leak. It does not stain the inside of the main body, and even if the recess 4
7, there is no risk of corrosion since the main body 2 is made of synthetic resin.

Furthermore, the flow of cooling air within the main body is smoother because there are no obstacles compared to when the storage battery is housed within the main body.

Furthermore, by providing the recess 47 in the upper wall 2a on the generator side, together with the heat insulation properties of the case itself, it is possible to suppress heat conduction to the storage battery 16 and prevent thermal deformation of the synthetic resin battery case of the storage battery. can.

Furthermore, since the protective cover 17 is also made of synthetic resin, the storage battery 16
There is no need to provide any electrical insulation means between the upper surface terminal portion 16a and the protective cover 17.

In the illustrated example, one protective cover 17 protects the fuel tank 1.
3 and storage battery 16, it goes without saying that both 13 and 16 may be covered separately with separate covers.

Above the engine 4, the protective cover 18 covering the cooling air holes 32 made in the earthen wall of the main body 2 is made of a metal plate with good heat absorption, such as an iron plate, as shown in Fig. 6.12. 54, both ends 55 in the longitudinal direction are substantially horizontal, and both ends 54.5
5 are bent so that they are connected at a slope.

On the lower surface of the top surface portion 54, four elastic claws 56 having an arcuate body surface that engage with the inner edge of the cooling air hole 32 are arranged in pairs, facing each recessed portion, and each upper end portion is fixed with a rivet 57. has been done.

Further, cushioning materials 5B are attached to the lower surfaces of both ends.

When each elastic claw 56 of the protective cover 18 is aligned with the inner edge of the cooling air hole 32 and pushed in, each elastic claw 56 is bent by its elastic force and engages with the inner edge of the cushion material 58.
comes into contact with the outer surface of the upper wall of the main body 2, and an air passage gap is formed between the mouth edge of the cooling air hole 32 and the lower surface of the top surface of the protective cover 18.

Since the protective cover 18 has good heat absorption properties, it can actively absorb the heat radiated from the engine 4 through the cooling air holes 32, especially after the engine has stopped operating and the cooling fan 31 has also stopped rotating. By dissipating this into the atmosphere, it is possible to prevent heat from accumulating within the main body 2.

Side wall 2b where the exhaust muffler storage chamber 9 of the book/body 2 is located
When an engine generator is suspended on the outer surface of the upper side of the main body, a pair of recesses 59 (FIGS. 2 and 6) that open laterally and allow fingers to be hung thereon are formed at the same time as the main body.

Further, the opposing side walls 2e are cut into the main body toward the top to form a slope, and the surface half of the slope is used as the terminal plate surface 19.

A protruding edge 60 is formed along the upper edge of the terminal plate surface 19 at the same time as the main body is molded, and a downwardly opening recess 61 formed by the protruding edge 60 is formed as a part for the finger hook for hanging. do.

These four parts 59 and 61 are connected to other opposing side walls 2C as necessary.
, 2d.

By making the main body 2 made of synthetic resin as shown in E,
The finger rests for hanging can be molded at the same time as parts 59 and 61 of the main body, and there is no need to provide the finger rests in a separate process, which is effective for -4-1 in reducing manufacturing man-hours and costs. be.

In addition, the terminal plate surface 19 uses the upper part of the outer surface of the inclined side wall 2e as described above, and utilizes the electrical insulation properties of the main body 2 to make use of the welding machine's cable connection terminals 62 (+), 63 (
- Various connection terminals such as "1" and the like are exposed on the terminal plate surface 19 and directly attached to the side wall 2e without using any electrical insulation means.

Further, electrical components such as plug sockets, switches, adjustment knobs, etc. are also directly attached to the side wall 2e.

By making the main body 2 made of synthetic resin in this way, the terminal plate surface 19 can be formed using the electrically insulating side wall 2e at the same time as the main body is formed.
is formed, and by attaching various terminals etc. directly to the side wall 2e, when attaching a separately made terminal board to the main body as in the past, or attaching various connection terminals to a steel plate case, there is a gap between the terminal and the case. Compared to the method that uses electrical insulation means, the cost and labor of manufacturing and installing the terminal board can be saved, and the number of parts can be reduced during assembly.
Problems such as the terminal board rattling or coming off due to loosening of its mounting screws are also eliminated.

The terminal plate surface 19 is appropriately painted in a different color from the main body 2.

Further, the terminal plate surface 19 is not limited to the side wall 2e, but may be provided on another side wall or on the outer surface of the earthen wall if there is room.

The inner surface of the upper wall 2a of the main body 2 and the inner surfaces of the side walls 2b, 2C, and 2d, excluding the side wall 2e having the terminal plate surface 19, are designed to minimize the leakage of noise generated by the engine 4 and generator 5 to the outside. Sound absorbing materials such as glass wool6
4 is installed.

As shown in FIG. 13, when the main body is molded, a metal fitting 65 shaped like a hairpin is used, and the bent base 65a is attached to the top wall 2a, side walls 2b, 2C, 2 of the main body 2.
d at appropriate intervals, and both leg portions 65b on the distal end side thereof are provided so as to protrude inside the main body, and the sound absorbing material 64 is pierced into the both leg portions 65b, and the portion that protrudes from the sound absorbing material 64. A washer 66 is fitted as appropriate to the two protrusions, and both protruding portions are bent outward and supported to prevent them from coming off.

For the above-mentioned attachment, the metal fitting is not limited to a hairpin type, but may be a single linear piece or the head of a small eagle embedded in the main body 2 and fastened with a nut.

When the main body 2 is made of synthetic resin as described above, the sound absorbing material can be attached by embedding and fixing the residual material in the upper wall of the main body at the same time as molding the main body. Compared to the case where the sound absorbing material is attached using a holding member such as a steel band, the sound absorbing material can be installed in an extremely short time and efficiently, and the sound absorbing material 64 can be attached at multiple locations on the inner surface of the earthen wall, etc. Since it is held in an expanded state and does not sag, it does not impede the flow of cooling air, allowing efficient cooling of the engine and the like.

Note that the sound absorbing material 64 is also appropriately attached to the inner surface of the side wall 2e.

As shown in FIGS. 6 and 7, the bottom plate 6 is molded from the same synthetic resin as the main body 2, and is made of four scalene angle members 6.
It has a steel reinforcing frame 72 in which frames 8 to 71 are combined in a substantially rectangular shape.

Two horizontal angle members (horizontal members) 6 of the reinforcing frame 72
8.Place the top surface of each long side of 69 on the bottom surface of both sides of the bottom plate 6,
Two vertical angle members (vertical members) 70 and 71 are positioned at right angles to the horizontal angle members 68 and 69, respectively, and on the line on which the centers of gravity of the engine 4 and the generator 5 act. The bottom surface of each long side is placed on the bottom surface of the bottom plate 6, and the top and bottom surfaces of the bottom plate 6 are held between the four angle members 68 to 71.

The mutual fixing structure of the angle members 68 to 71 is, in the illustrated example, a fixing screw 10b of the support bracket 10a of the wheel 10.
are inserted into the base holes of the horizontal angle members 68, 69, the bottom plate 6, and the vertical angle members 70, 71 to form the vertical angle members 7.
A nut 73 is screwed into a portion protruding from the top surface of the wheel 10, but it is not an essential requirement that the fixing screw 10b of the wheel 10 be used commonly for fixing each angle member.

On the upper surface of the vertical angle member 70 on the engine side, two seismic rubbers 24 supporting the engine 4 are attached at an appropriate interval, and the vertical angle member 71 on the generator side is attached.
A piece of seismic isolation rubber 25 is attached to the upper surface of the generator 5 to support the generator 5.

Mounted on the bottom of the engine 4 and generator 5 (pol) 24
a, 25a are provided, and each bolt is connected to the vibration-proof rubber 24.
25. The vertical angle member 70.71° is inserted through the bottom plate 6 and fixed with nuts from the bottom surface of the bottom plate 6.

With the above configuration, the weight of the engine 4 and the generator 5 is supported by the reinforcing frame 72 via the seismic rubber 24 and 25, respectively, and the bottom plate 6 itself is made of synthetic resin because it simply closes the opening of the main body 2. However, this does not cause any problems and is effective in reducing the weight of the case.

As described above, according to the present invention, the case 1 is made of a low specific gravity synthetic resin with high impact resistance and excellent heat insulation, so that the total weight of the engine generator can be reduced compared to the conventional steel case. It can be significantly reduced in weight compared to previous models, and will not be deformed by impact or dropping, and there is no risk of electrical leakage.

By appropriately mixing a coloring agent into the synthetic resin, it is possible to eliminate the need for painting the case, thereby saving the cost and labor of painting.

Further, it is easy to form a deep recess 37 that opens upward and on one side in the case upper wall 2a, and the fuel tank 13 is accommodated in the recess 37, and the opposite side wall 37 of the recess 37
b. Since the crank-shaped fixing member 40 whose both ends are supported by 37C holds the outer part of the fuel tank 13 and presses the upper surface of the tank flange 38, the flange 38 can be skillfully used to fix the fuel tank 13. The fixing structure is extremely simple.

Furthermore, by providing the fuel tank 13 outside the case, there is no obstacle to the flow of cooling air inside the case, and a smooth air flow can be generated to efficiently cool the engine and the like.

At the same time, there is no risk of fuel leaking into the case, which is effective in preventing fires and keeping the inside of the case clean.

Further, although the fuel tank 13 is housed and fixed in the recess 37, the excellent heat insulation properties of the case 1 sufficiently suppress heat conduction to the fuel tank 13, and the fuel tank 13 does not protrude to the outside of the case. Therefore, the appearance is also good.

[Brief explanation of the drawing]

1 to 13 show an embodiment of the engine generator, in which FIG. 1 is a front view, FIG. 2 is a rear view, FIG. 3 is a side view as seen from the direction A in FIG. Figure 4 is a side view seen from direction B in Figure 1, Figure 5 is a plan view, and Figure 6 is Figure 5 VI-V.
I-line sectional view, Figure 7 is a plan view of the case bottom plate, Figure 8 is a plan view of Figure 5 with the protective cover removed, Figure 9 is a plan view of the fuel tank fixing member, and Figure 10 is a plan view of the fuel tank. FIG. 11 is a partial sectional view taken along the line M-M in FIG. 5, and FIG. 12 is a sectional view taken along the line 5 °
FIG. 3 is a partial sectional view showing how the soundproofing material is installed. DESCRIPTION OF SYMBOLS 1... Case, 2a... Upper wall, 2b-2e... Side wall, 4... Engine, 5... Generator, 6... Bottom plate, 13... Fuel tank, 37...・Concavity, 37 b,
37 c...Side wall, 38...Flange, 40...
・Fixed member.

Claims (1)

[Scope of utility model registration request] In a portable engine generator in which an engine 4 and a generator 5 driven by the engine 4 are housed in a case 1, the case 1 is made of a low specific gravity synthetic resin with high impact resistance and excellent heat insulation properties. Molded upper wall 2a, side wall 2b~
2e, a box-shaped structure consisting of a bottom plate 6, and a deep recess 37 with a planar U-shape that opens upward and to one side is formed in the upper wall 2a of the case 1 during molding of the upper wall, and the recess 37
The fuel tank 13 of the engine 4 is housed therein, and the fuel tank 13 of the engine 4 has a series of substantially horizontal flanges 38 on the outer periphery, and the upper surface of the flange 3B surrounds the side of the fuel tank 13 on the side opening side of the recess 37. The fuel tank 13 is fixed to the recess 3 by supporting both ends of the crank-shaped fixing member 40 in contact with the opposite side walls 37 b and 37 c of the recess 37 .
Portable engine generator fixed to 7.