JPH08223854A - Engine generator - Google Patents

Abstract

PURPOSE: To provide an engine generator in which electric components are positively cooled by a part of cooling air to utilize the cooling air efficiently. CONSTITUTION: In an engine generator 1 which is driven by an engine 21, cooling air is supplied to the cylinder of the engine 21 by a cooling fan 25 and, at the same time, a part of the cooling air is supplied to the electric components through a cooling air exhaust outlet 31. As the electric components are positively cooled by a part of the cooling air which is made to blow by the cooling fan 25, the cooling air can be efficiently utilized. Further, the cooling air can be divided into two systems, i.e., the high temperature side and the low temperature side, and supplied to the engine, etc., which are on the high temperature side and to the electric components which are on the low temperature side individually to cool them and the hot air of the engine side 21 can be prevented from flowing to the low temperature side electric components without providing a heat shielding plate, etc., so that the electric components can be securely cooled by the low temperature cooling air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine generator such as a portable generator driven by an engine.

[0002]

2. Description of the Related Art In an engine generator in which an engine drives a generator, it is necessary to prevent the generator and electrical components from being thermally affected by the engine.

Therefore, a cooling fan that is rotationally driven by the engine is provided, the engine and its surroundings are cooled by the cooling air induced by the cooling fan, and a heat shield plate or the like is provided between the engine and the generator or electrical components. A method of thermally isolating the two via an intermediary is adopted.

[0004]

However, according to the above-mentioned conventional method, since the generator and the electrical components are not actively cooled by the cooling air, the cooling air cannot be effectively used.
Further, there is a problem that the number of parts increases because the heat shield plate and the like are provided.

Further, since the air cleaner, the carburetor and the like are arranged on the high temperature side of the engine, the intake air flowing through these intake system parts is heated to reduce its density, which lowers the charging efficiency of the engine and results in a high output. There was also a problem that I could not get.

The present invention has been made in view of the above problems, and an object of the present invention is to generate an engine power generation in which the electric components can be positively cooled by a part of the cooling air to effectively utilize the cooling air. To provide a machine.

Further, the object of the present invention is to separately supply the cooling air to the high temperature side of the engine side and the low temperature side of the electrical equipment, the intake system parts or the generator to provide the heat shield. Prevents hot air on the engine side from flowing to the low temperature side without providing a plate,
An object of the present invention is to provide an engine generator capable of efficiently cooling intake system components, electric components, generators, etc. arranged on the low temperature side.

Further, an object of the present invention is to cool the intake air by cooling the intake system parts such as the air cleaner and the carburetor, and to improve the charging efficiency of the engine and the output thereof. To provide.

[0009]

In order to achieve the above object, the invention according to claim 1 is an engine generator driven by an engine, in which cooling air is supplied to a cylinder of the engine by a cooling fan. It is characterized in that a part of the wind is supplied to electric components.

A second aspect of the present invention is characterized in that, in the first aspect of the invention, the cylinder of the engine is inclined and an electric component is arranged on the opposite side of the cylinder.

According to a third aspect of the present invention, in the first or second aspect of the invention, a generator is connected to the side of the engine, and an introduction hole for introducing cooling air for cooling the inside of the generator is provided. It is characterized in that it is provided on the downstream side of the cooling fan.

A fourth aspect of the present invention is characterized in that, in the first, second or third aspect of the present invention, a carburetor and an air cleaner are disposed in the vicinity of electrical components arranged on the opposite side of the engine cylinder. To do.

According to a fifth aspect of the present invention, in the invention according to the first to third or fourth aspects, it is on the side of the cylinder of the engine and on the downstream side of the cylinder of the cooling air supplied to the cylinder. An exhaust muffler is provided.

[0014]

According to the invention described in claim 1, since the electric components are positively cooled by a part of the cooling air, the cooling air can be effectively used.

According to the second aspect of the present invention, since the engine cylinder, which is a high temperature component, is inclined and the electric components are arranged on the opposite side, the cooling air is divided into two systems, a high temperature side and a low temperature side, and the high temperature side is divided into two systems. It is possible to separately supply the engine and other low-temperature side electrical components to cool them, and prevent hot air from flowing from the engine side to the low-temperature side electrical components without providing a heat shield plate. Therefore, the electric component can be reliably cooled by the cooling air having a low temperature.

According to the third aspect of the invention, the cooling air from the cooling fan can be introduced into the generator through the introduction hole to reliably cool the generator with the cooling air having a low temperature.

According to the fourth aspect of the present invention, since the carburetor and the air cleaner are provided on the low temperature side where the electric components are arranged, these intake system components are also cooled by the cooling air flowing through the low temperature side and having a low temperature. The intake air flowing through the intake system components is efficiently cooled, and as a result, the charging efficiency of the engine is improved and its output is improved.

According to the invention of claim 5, since the exhaust muffler, which is a high temperature component, is provided on the downstream side of the cylinder of the engine, the high temperature components are concentrated on one side, and a heat shield plate or the like is not provided. However, it is possible to effectively prevent the heat from the high temperature components from propagating to the low temperature side.

[0019]

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

FIG. 1 is a front view of an engine generator according to the present invention, FIG. 2 is a plan view of the engine generator, and FIGS. 3 and 4 are views in the directions A and B of FIG. 1, respectively. is there.

First, the overall construction of the engine generator 1 according to this embodiment will be outlined with reference to FIGS. 1 to 4.

The engine generator 1 according to this embodiment is constructed by disposing an engine in the right half of FIG. 1 and a generator in the left half of the engine crankcase 2 and the bottom of a frame 3 of the generator. Two rubber mounts 4 each attached
It is installed horizontally on the floor via.

A fuel tank 5 is disposed above the engine generator 1, and a tank cap 6 is screwed onto the upper surface of the fuel tank 5 and a carrying handle 7 is attached. ing. In this fuel tank 5, as shown in FIG. 1, a part of both ends in the longitudinal direction of a joint flange portion 5a made of a sheet metal is bent downward at a right angle, and two bolts 8 inserted into this portion are used. The crankcase 2 and the frame 3 are attached to boss portions 2a and 3a, which are respectively provided on the upper portion of the crankcase 2 and the frame 3. As described above, by bending a part of the joint flange part 5a of the fuel tank 5 downward, the rigidity of the part is increased, and the fuel tank 5 can be firmly attached to the crankcase 2 and the upper part of the frame 3. .

Further, as shown in FIGS. 1 to 3, a fan cover 9 is provided at a side end portion of the engine generator 1 on the engine side.
Is attached, and the handle 10 of the recoil starter for starting the engine is exposed from the fan cover 9.

On the other hand, the frame 3 faces the side end of the engine generator 1 on the generator side as shown in FIG.
A DC 12V outlet 11 is attached to the upper portion of the side end surface of the frame 3.

Further, the front side of the engine generator 1 is shown in FIG.
As shown in FIG. 3, a case 12 integrally molded with resin is attached, the lower half of the case 12 is covered with another resin cover 13, and AC 220V is provided on the left and right of the upper half of the case 12. An outlet 14, an engine switch 15, and a choke lever 16 are attached respectively. As shown in FIG. 3, a fuel cock 17 disposed inside the cover 13 is exposed at the engine-side end surface of the engine generator 1. The fuel cock 17 is a bottom portion of the fuel tank 5. Is attached to.

Further, an exhaust pipe 18 (see FIG. 3) led out from the engine and an exhaust muffler 19 (see FIG. 4) connected to the exhaust pipe 18 are provided on the back side of the engine generator 1. A part of the exhaust muffler 19 is covered with a muffler cover 20.

Next, the internal structure of the engine generator 1 will be described with reference to FIGS. 5 and 6 are a front view and a rear view, respectively, of the engine generator, FIG. 7 is a plan view of the engine generator, and FIG. 8 is the engine generator seen from the engine side with the fan cover removed. 4 is a side view, FIG. 9 is an enlarged cross-sectional view taken along the line CC of FIG. 4, and FIG. 10 is a partially cutaway plan view of the generator side of the engine generator.

The engine 21 used in this embodiment is a two-cycle engine, and its cylinder 22 is inclined to one side as shown in FIG. 8, and as shown in FIG. The divided pieces 2A and 2B are joined and integrated. Incidentally, one of the divided pieces 2A
2A-1 constitutes a frame of the generator, and a plurality of cooling air introduction holes 23 are formed in a part thereof as shown in FIGS. 5 and 7.

As shown in FIG. 7, the crankcase 2
A crankshaft 24 is rotatably accommodated therein, and a cooling fan 25 is taper-fitted to one end of the crankshaft 24 and is joined by a nut 26. On the outer peripheral side of the cooling fan 25, as shown in FIGS. 7 and 8, a scroll-shaped air passage 27 is formed by the end surface of the crankcase 2 and the fan cover 9, and the air passage 27 is formed. , One end opening 28a of a resin-made cylinder cover 28 that covers the cylinder 22 (see FIGS. 7 and 8)
Is facing. The fan cover 9 has a plurality of cooling air introduction holes 9a formed radially. Further, as shown in FIG. 8, an opening 28b is provided at the lower end of one end of the cylinder cover 28.
The cylinder cover 2 is formed as shown in FIG.
An opening 28c is formed at the other end of 8, and a part of the fan cover 9 (a hatched portion in FIG. 8) is provided so as to project to the outside of the cylinder cover 28.

By the way, as shown in FIGS. 6 and 8, in the lower portion of the divided pieces 2A, 2B of the crankcase 2 on the cylinder 22 side (rear surface side), the lengthwise direction (the left-right direction in FIG. 6) is inclined downward. ) Long flat air guide walls 29A, 29B
Are integrally formed.

On the other hand, as shown in FIGS. 7 and 8, on the flange portion 2b formed on the outer periphery of one end of the crankcase 2, there are formed two elongated cooling air outlets 31 which are open to the air passage 27. Has been done.

Thus, as shown in FIG.
The exhaust pipe 18 extends from the cylinder 22 side of the crankcase 2. The exhaust pipe 18 extends downward from the cylinder 22 and is then bent at a substantially right angle to the generator 30 side (right side in FIG. 6). The air guide walls 29A, 2 formed in the lower part of the
The exhaust muffler 19 is connected to the end portion of the exhaust pipe 9B extending above it.

Further, a carburetor 32 is arranged on the side of the engine 21 opposite to the cylinder 22 (lower side in FIG. 7). In FIG. 7, 33 is an ignition coil,
34 is a spark plug.

In this embodiment, as shown in FIG. 8, the cooling fan 25 is formed with two fan removing holes 35 facing each other. And, the procedure is as shown in FIG.

That is, FIG. 11 is a cross-sectional view showing how to remove the cooling fan 25, and FIG. 12 is a cross-sectional view taken along the line D--D of FIG. 11. To remove the cooling fan 25 from the crankshaft 24, the same is shown in FIG. A dedicated jig 36 is used. The jig 36 includes a plate 37, one bolt 38 screwed into the center of the plate 37, two bolts 39 inserted through circular holes 37 a formed at both ends of the plate 37, and each bolt 39. It is composed of a nut 39a that is screwed into.

Then, the cooling fan 25 is connected to the crankshaft 24.
When removing from the nut, first, the nut 26 (see FIG. 7)
After loosening and removing it, the heads of the two bolts 39 are attached to the removal holes 3 formed in the cooling fan 25.
5 through the large diameter portion 35a as shown by the chain line in FIG.
Next, the bolt 39 is moved inward in the radial direction so that its shaft portion is engaged with the small diameter portion 35b of each removal hole 35 as shown by the solid line in FIG. Then, the head of the bolt 39 contacts the cooling fan 25, so that the bolt 39 is prevented from coming off.

Next, when the bolt 38 is rotated in a state where one end of the bolt 38 screwed into the center of the plate 37 is brought into contact with the end surface of the crankshaft 24, the plate 37 moves outward along the bolt 38. Since it moves to the right (in FIG. 11) and pulls the cooling fan 25 with a strong force in the same direction through the two bolts 39, the cooling fan 25 is released from the taper fitting with the crankshaft 24, and the crankshaft 24 is released. Easily removed from 24.

Next, the structure of the generator 30 will be described.

As shown in FIG. 5, the generator 30 according to this embodiment is connected to a rotor shaft 40 coaxially connected to the crankshaft 24 of the engine 21 and the outer periphery of the rotor shaft 40. The rotor 41 and the stator 42 fixedly provided on the outer peripheral side of the rotor 41 are included, and these are integrally molded in a substantially bowl shape with a part 2A-1 of the split piece 2A of the crankcase 2. It is housed in the space formed by the frame 3, and the three bolts 4 are sandwiched between the part 2A-1 of the divided piece 2A and the frame 3 with the stator 42 interposed therebetween.
They are integrally connected by 3. In this embodiment, the crankcase 2 is divided into two pieces 2A and 2B,
The part 2A-1 of one of the divided pieces 2A is configured as a part of the frame of the generator 30, but the crankcase and the generator 3
The frame of 0 may be completely separated.

By the way, as shown in FIG. 5, one end of the rotor shaft 40 is taper-fitted to the end of the crank shaft 24, and is connected to the crank shaft 24 by a long bolt 44 inserted through the center of the shaft. Has been done. The end portion of the rotor shaft 40 (the end portion on the side opposite to the connecting portion with the crank shaft 24) is covered with the frame 3 and
It is rotatably supported by the frame 3 via a ball bearing 45, and a cooling fan 46 is connected to the inside of the shaft support portion of the rotor shaft 40 for the frame 3.

Further, as shown in FIG. 5, a plurality of ventilation holes 47 for discharging cooling air for cooling the inside of the generator 30 are formed on the side surface of the frame 3 formed in a substantially bowl shape. There is. Further, a small rectangular hole 48 is formed on the end surface of the frame 3 as shown in FIG. When the ventilation hole 47 serves as a cooling air introduction hole, the cooling fan 46 is attached to the connecting portion side of the rotor shaft 40 with the crankshaft 24.

By the way, in this embodiment, the ball bearing 45 supporting one end of the rotor shaft 40 is press-fitted into the rotor shaft 40, and a pin 49 for preventing rotation is provided on the outer periphery of the ball bearing 45 in a protruding manner. There is. The ball bearing 45 may be press-fitted to the frame 3 side, and the rotor shaft 40 may be fitted into the ball bearing 45.

Thus, when the ball bearing 45 is fitted to the frame 3 when the rotor shaft 40 is assembled to the frame 3, as shown in FIG. 9)), but the positional relationship between the pin 49 and the engagement groove 3b can be visually confirmed from the vent hole 47 formed in the frame 3, so that the rotor shaft 40 Frame 3
It can be assembled to work well. In this case, since the cooling fan 46 is mounted inside the shaft support portion of the rotor shaft 40 to the frame 3,
The shaft support of 0 projects to the outside of the cooling fan 46, and
The cooling fan 46 does not obstruct the view from the ventilation hole 47. It should be noted that the presence of the pin 49 is confirmed from the rectangular hole 48 (see FIG. 4) formed in the end surface of the frame 3 when the assembly of the rotor shaft 40 is completed and the ball bearing 45 is fitted to the frame 3. be able to.

By the way, in the present embodiment, as shown in FIG. 10, the DC is provided above the frame 3 of the generator 30.
A 12V outlet 11 is attached. In FIG. 10, 50 is a breaker and 51 is a rectifier.

Next, the structure and mounting structure of the resin case 12 will be described with reference to FIGS. 13 is a sectional view taken along the line EE of FIG. 1, FIG. 14 is a sectional view taken along the line FF of FIG. 1, FIG. 15 is a sectional view taken along the line GG of FIG. 1, and FIG. 17 is a plan sectional view of the case, and FIG.

The resin case 12 is on the opposite side (front side) from the side (rear side) on which the cylinder 22 of the engine 21 is arranged.
Which is integrally molded with the air cleaner case 12A located in the lower half and the electrical equipment mounting base 12B located in the upper half.

The air cleaner case 12A that constitutes the lower half of the case 12 has a box-shaped portion 12a that opens to the front side. As shown in FIGS. 15 and 16, the box-shaped portion is formed. On the bottom surface of 12a, a rectangular air intake box 52 having an open front surface, screwing boss portions 53 and 54, and a rib 55 are integrally formed, and an opening portion 56 communicating with the carburetor 32 is formed. And
The front opening of the box-shaped portion 12a of the air cleaner case 12A is covered with the resin cover 13.

On the back surface of the cover 13, two intake nozzles 57, two bosses 58 and a shielding plate 59 are integrally projected, and the cover 13 is surrounded by a box of an air cleaner case 12A. The screw 60, which is inserted into the boss 58 in a state where the screw 60 is fitted in the groove 12a-1 formed around the shaped portion 12a, is attached to the boss 5 on the air cleaner case 12A side.
By screwing on the nut 61 embedded in 8,
Box-shaped part 1 attached to the air cleaner case 12A
Cover the front opening of 2A. In the state where the cover 13 is attached, as shown in FIG. 15, the two intake nozzles 57 open in the intake box 52 formed on the air cleaner case 12A side and are formed on the air cleaner case 12A side. The air filter 62 fitted between the formed ribs 55 is sandwiched between the bottom surface of the air cleaner case 12A (box-shaped portion 12a) and the cover 13.

On the other hand, a box-shaped portion 12b having an opening on the back side (inner side) is integrally formed with the electrical equipment mounting base 12B constituting the upper half of the resin case 12, and the box-shaped portion is formed. 12b is the AC220V outlet 14
(See FIG. 13), capacitor 63 (see FIG. 17), CD
I unit 64 (see FIGS. 14 and 17), coupler 65
(See FIG. 17) and other electrical components are attached. FIG.
As shown in FIG. 3, the back side opening of the box-shaped portion 12b is covered with a sheet metal cover 67. Further, as shown in FIG. 14, a slit 12c through which the choke lever 16 penetrates is formed in the electrical equipment mounting base 12B of the case 12.
The choke lever 16 penetrates the slit 12c, and its operating portion is exposed to the outside of the case 12.

By the way, in this embodiment, the generator 3
The conductor wire (not shown) wound around the stator 42 of No. 0 is directly extended and directly connected to the capacitor 63 and the coupler 65, which is costly compared to the conventional structure in which separate leads are interposed between them. Can be down.

The lower portion of the resin case 12 is screwed and fixed to the frame 3 of the generator 30 with one screw 68, and the intake manifold 70 (of the engine 21 is provided with two bolts 69). (See Figure 14)
It is fixed with screws. That is, the lower half of the case 12 has a boss portion 3c in which a screw 68 that is inserted into the boss portion 54 is provided on the side portion of the frame 3 of the generator 30 (see FIG. 13).
It is screwed and fixed to the frame 3 by being screwed onto the air intake manifold 70 together with the carburetor 32 by the flange 71, the case 12 and the two bolts 69 inserted through the carburetor 32, as shown in FIGS. (See FIG. 14).
As shown in FIGS. 15 and 16, the flange 71 has an opening 71a.

On the other hand, as shown in FIG. 13, in the upper half of the case 12, two engaging projections 72 projecting from the upper surface of the box-shaped portion 12b are formed on the bottom surface of the fuel tank 5. It is fixed by engaging with the engaging recess 5b. The engagement protrusion 72 formed on the case 12 side is configured by a cross-shaped rib 72a having a taper portion that tapers upward, and the engagement recess 5b formed on the bottom surface of the fuel tank 5 extends downward. It has a sloping surface portion that widens toward the side, and when the engagement convex portion 72 and the engagement concave portion 5b are engaged with each other, the sloping surface portions of both are in surface contact with each other.

When the engine 21 is driven, the negative pressure of the intake air generated in the engine 21 pulls the intake air into the case 12 through the two intake nozzles 57 of the cover 13. The intake air flows into the intake box 52, collides with the bottom surface of the intake box 52, bounces back, and flows out of the intake box 52 through a space between the intake box 52 and the intake nozzle 57, and then passes through an air filter 62 to be purified, and a shielding plate. 59
Beyond the flange 71 and the openings 71a, 5 of the case 12
6 flows into the carburetor 32 and is used for forming the air-fuel mixture in the carburetor 32. In this case, since the fresh air flowing from the intake nozzle 57 into the case 12 is introduced into the intake box 52, the intake noise is reduced and large dust is prevented from entering. Further, the shielding plate 59 also reduces the intake noise and prevents the invading dust from flowing into the carburetor 32 side.

In this embodiment, since only the lower portion of the resin case 12 is screwed and fixed to the frame 3 of the generator 30, the number of screwing points is reduced and the number of assembling steps is reduced. The assemblability is improved and the cost is reduced. Further, since the upper portion of the resin case 12 is not fixed by screws and is engaged with the fuel tank 5, the resin case 1
No. 2 is highly flexible as a whole, and the poor precision during assembly is absorbed by the deformation of the case 12.

Further, since the upper portion of the resin case 12 is engaged with the fuel tank 5 with the sloped portion in a concavo-convex manner, the resin case 12 is surely free from chattering without using screwing means. Fixed.

Further, according to the present embodiment, the screw 68 for fixing the lower portion of the case 12 is covered by the cover 13, so that the screw 68 is not exposed to the outside and the appearance of the engine generator 1 is enhanced. . Further, since the bottom surface of the box-shaped portion 12a of the case 12 is screwed and fixed to the frame 3, the screw 68 approaches the frame 3 as shown in FIG. 13, and accordingly, the protruding length of the boss portion 3c on the frame 3 side. Can be kept short.

In addition, according to this embodiment, since the box-shaped portion 12b is formed in the upper portion of the case 12, the rigidity of the portion is increased and the front side of the upper portion of the case 12 is less likely to be deformed at the time of assembly. The front surface of the upper part of the case 12 can be directly used as a design surface.

By the way, the two-stroke engine 21 according to the present embodiment is provided with the governor mechanism 73 shown in FIG. 18 and the adjusting mechanism 74 for the governor mechanism 73. It will be described based on. 18 is a plan view showing the governor mechanism and its adjusting mechanism, and FIG.
9 is a sectional view taken along line H-H in FIG. 18, and FIG. 20 is I-I in FIG.
It is a line sectional view.

The governor mechanism 73 controls the engine 2 regardless of the load.
1 is a mechanism for keeping the rotational speed of 1 substantially constant, and a governor shaft 75 that rotates according to the engine rotational speed by a mechanism (not shown) incorporated in the crankcase 2 and one end of the governor shaft 75 is connected to the governor shaft 75. Governor arm 76
And a link 77 connected to the other end of the governor arm 76.
And a tension spring 78 whose one end is connected to an intermediate portion of the governor arm 76.

In FIG. 18, reference numeral 79 is a rotary shaft of a throttle valve (not shown) provided on the carburetor 32, and an intermediate portion of a throttle arm 80 is connected to the rotary shaft 79. The other end of the link 77 is connected to one end of the throttle arm 80, and the throttle arm 80 and the governor arm 76 are connected to each other via the link 77.

On the other hand, a governor adjusting mechanism 74 is provided above the crankcase 2. This governor adjustment mechanism 7
Reference numeral 4 denotes a mechanism for adjusting an engine speed that should be kept constant by adjusting an initial set load of the tension spring 78, and a support portion 2d integrally formed on the upper portion of the crankcase 2 and the support portion 2d. An adjusting screw 81 which is inserted into a through hole 2d-1 formed in the portion 2d, and a thrust plate 82 which is screwed into the adjusting screw 81 so as to move back and forth.
A compression spring 83, which is compressed between the thrust plate 82 and the support portion 2d, and a rotation stop portion 2e of the thrust plate 82 are included. The detent portion 2e is composed of two walls integrally formed with the crankcase 2 in parallel with each other.
The direction of e and the through hole 2d-1 formed in the support portion 2d is the die-cutting direction (the left-right direction in FIG. 18) when the crankcase 2 is cast.

One end of the tension spring 78 is hooked on the lower end of the thrust plate 82, and the other end of the tension spring 78 is three circular holes 76a, 76b, 7 formed in the governor arm 76.
6c (in this embodiment, the central circular hole 76b).

FIG. 18 shows a state in which the throttle valve (not shown) is fully opened. The governor shaft 75 rotates clockwise in FIG. 18 as the engine speed increases and the governor arm rotates. 76 is rotated in the same direction (the direction indicated by the solid line in the figure).

The operation of the governor mechanism 73 and its adjusting mechanism 74 will be described.

For example, since the engine load is small because the electric power used is small and the engine speed increases accordingly, as described above, the governor shaft 75 and the governor arm 76 connected thereto rotate in the direction of the solid line arrow in FIG. When moved, the tension force of the tension spring 78 increases, and the governor arm 76 stops at a position where the turning force of the governor arm 76 and the tension force of the tension spring 78 are balanced.
Throttle valve is link 77 and throttle arm 8
Since the degree of opening is maintained at 0 through 0, the engine speed is kept substantially constant.

When the engine load also increases due to the increase in power consumption and the engine speed gradually decreases accordingly, the governor arm 76 is rotated in the direction of the broken arrow by the tensile force of the tension spring 78, and the throttle valve is opened. Since the opening degree of is adjusted to increase, the engine speed increases. Then, when the governor arm 76 rotates in the direction of the solid line arrow in FIG. 18 due to the increase in the engine speed, the tension force of the tension spring 78 increases, and at the position where the turning force of the governor arm 76 and the tension force of the tension spring 78 are balanced. Since the governor arm 76 is stationary, the engine speed is kept substantially constant as described above.

As described above, the engine speed is kept substantially constant regardless of the load, but the governor adjusting mechanism 74 adjusts the length of the tension spring 78 to adjust the engine speed which should be kept constant. Then, the initial setting load (tensile force) is changed to facilitate this.

That is, when the adjusting screw 81 is turned by using a driver (not shown), the thrust plate 82 screwed onto the adjusting screw 81 moves in the direction of arrow a or b in FIG. The load changes, which regulates the engine speed which should be kept constant. Specifically, when the thrust plate 82 is moved in the direction of arrow a in FIG. 19, the initial set load of the tension spring 78 becomes smaller, and the engine speed that should be kept constant is adjusted to a lower direction. When 82 is moved in the direction of arrow b in FIG. 19, the initial set load of the tension spring 78 increases, and the engine speed that should be kept constant is adjusted to increase.

Thus, the governor adjusting mechanism 7 according to this embodiment.
In No. 4, since the support portion 2d of the adjusting screw 81 and the rotation stop portion 2e of the thrust plate 82 are integrally formed with the crankcase 2, the number of parts is reduced and the cost is reduced.
Assembling is improved. Further, since the adjusting screw 81 is exposed to the outside and other parts are not in the vicinity thereof, adjustment can be performed with good workability.

Further, since the direction of the through hole 2d-1 of the supporting portion 2d integrally formed with the crankcase 2 and the rotation stopping portion 2e is the die-cutting direction when the crankcase 2 is cast, the cutting process is unnecessary.

As shown in FIG. 21, the crankcase 2
The integrally formed anti-rotation portion 2e composed of one wall, and by engaging the groove 82a formed at the lower end of the thrust plate 82 with the anti-rotation portion 2e, the anti-rotation portion of the thrust plate 82 is prevented. May be performed.

Next, the structure of the exhaust muffler 19 is shown in FIG.
It will be described with reference to FIGS. 22 is a side view of the exhaust muffler, FIG. 23 is a view in the direction of arrow J of FIG. 22, FIG. 24 is a side view showing the structure of the first expansion chamber of the exhaust muffler, FIG. 25, FIG. 26, and FIG. Are respectively KK in FIG.
It is a line, LL line, and MM line sectional drawing.

The exhaust muffler 19 according to this embodiment is constructed by joining outer cases 84A and 84B obtained by press-molding sheet metal, and as shown in FIG. The partition walls 85A and 85B partition the first expansion chamber S1 and the second expansion chamber S2. As shown in FIG. 7, the exhaust muffler 19 has a rear surface (outer case 8
4A) and is supported by the frame 3 by the bolts 43 that are inserted into the brackets 86 that are bonded to the frame 4A.

An exhaust gas inlet 87 is opened in the first expansion chamber S1 as shown in FIG. 25, and a portion of the outer case 84B where the exhaust gas inlet 87 is opened is shown in FIGS. 22 and 23. Further, a flange 88 which is attached to one end of the exhaust pipe 18 is attached by a bolt 90 through a gasket 89. Therefore, the exhaust pipe 18 communicates with the first expansion chamber S1 of the exhaust muffler 19 via the exhaust introduction port 87.
As shown in FIG. 6, the other end of the exhaust pipe 18 is attached to the cylinder 22 (see FIG. 8) of the two-cycle engine 21 by two bolts 92 that are inserted into a flange 91 connected to the exhaust pipe 18. There is.

By the way, as shown in FIGS. 24 to 27, a pipe-shaped communication passage 93 and an exhaust passage 94 having different diameters are formed at the joint between the two partition walls 85A and 85B, and the communication passage 93 is formed. Has one end communicating with the first expansion chamber S1 via the inlet 93a, and the other end communicating with the second expansion chamber S2 via the outlet 93b. Further, as shown in FIG. 27, one end of the exhaust passage 94 is connected to the second expansion chamber S2 through the inlet 94a.
, And the other end is open to the atmosphere as an opening 94b.

Exhaust gas discharged from the two-cycle engine 21 passes through the exhaust pipe 18 and the exhaust muffler 19
26, and is introduced into the first expansion chamber S1 through the exhaust introduction port 87, and as shown by the arrow in FIG.
The fluid flows from a through the inside of the communication passage 93 into the second expansion chamber S2 through the outlet 93b. Then, the exhaust gas that has flowed into the second expansion chamber S2 is, as shown in FIG. 27, the inlet 94a of the exhaust passage 94.
Through the exhaust passage 94 to the atmosphere through the opening 94b.

By the way, in this embodiment, as shown in FIG. 24, the exhaust introduction port 87, the communication passage 93, and the inlet 93a and the outlet 93b opening at both ends of the communication passage 93 are arranged substantially linearly. By adopting such a configuration, the exhaust muffler 19 can be completely cleaned.

Here, a procedure for cleaning the exhaust muffler 19 will be described.

To clean the exhaust muffler 19, first,
By loosening the two bolts 92 shown in FIG. 6 and removing them, and by loosening the bolt 43 shown in FIG. 7 and removing it, the exhaust muffler 19 is attached to the exhaust muffler 19.
Is attached (the state shown in FIGS. 22 and 23), and is removed.

Next, the bolt 90 shown in FIG. 22 and FIG.
And the exhaust pipe 18 is removed from the exhaust muffler 19. Then, the exhaust introduction port 87 is opened in the exhaust muffler 19, and as described above, the exhaust introduction port 87 and the communication passage 93, and the inlet 93a and the outlet 93b opened at both ends of the communication passage 93.
Are arranged substantially linearly, a substantially linear rod is inserted into the exhaust muffler 19 from the exhaust introduction port 87, and the rod is provided around the inlet 93a and the outlet 93b of the communication passage 93 and the inner wall of the communication passage 93. The attached carbon can be removed. Further, the carbon adhering to the inner wall of the exhaust passage 94 of the exhaust muffler 19 and the periphery of the inlet 94a is
4 is also removed by inserting a substantially straight rod from the open end 94b of the atmosphere.

As described above, in this embodiment, the inside of the exhaust muffler 19 can be completely cleaned by inserting a substantially linear rod from the exhaust introduction port 87 and the atmospheric opening end 94b of the exhaust passage 94, so that the exhaust gas is exhausted. Since it is not necessary to provide a cover for cleaning the muffler 19, the structure of the exhaust muffler 19 can be simplified and the cost can be reduced.

Further, since the exhaust pipe 19 can be detached independently, the exhaust pipe 19 can be freely bent, and the degree of freedom in design thereof is not impaired.

Further, in the exhaust muffler 19 according to this embodiment, the two partition walls 8 are provided between the outer covers 84A and 84B.
Since the communication passage 93 and the exhaust passage 94 are formed between both the partition walls 85A and 85B by sandwiching the 5A and 85B, the above-described configuration (the exhaust introduction port 87 and the communication passage 93 and the inlet 93a and the outlet opening at both ends of the communication passage 93) are formed. The configuration in which 93b is arranged in a substantially straight line can be obtained at low cost.

Next, the mounting structure of the rubber mount 4 in the engine generator 1 will be described with reference to FIGS. 28 to 30. 28 is an enlarged sectional view of the rubber mount mounting portion, FIG. 29 is a bottom view of the same, and FIG. 30 is a bottom view showing a modification of the support protrusion.

In this embodiment, as shown in FIG. 28, supporting projections 95 (only one of which is shown) are integrally formed on both lower parts of the crankcase 2, and the supporting projections 95 are cylindrical shaft parts. 95a and a flange portion 95b formed at the lower end of the shaft portion 95a. As shown in FIG. 29, the brim portion 95b is formed in a substantially lemon shape, and includes a narrow portion 95b-1 having a width close to the outer diameter dimension of the shaft portion 95a and a wide portion 95b-2 having a width larger than that. And both have a substantially orthogonal positional relationship.

On the other hand, the rubber mount 4 is formed of rubber into a substantially cylindrical shape, and a small-diameter hole portion 4a into which the shaft portion 95a of the support projection 95 is to be fitted is formed in the upper portion of the central portion thereof, and the lower half portion thereof is formed. A large-diameter hole portion 4b is formed in which the flange portion 95b of the support protrusion 95 is to be housed. Further, on the lower surface of the rubber mount 4, four convex portions 4c are integrally provided so as to project at an equal angular pitch.

Thus, in this embodiment, the rubber mount 4 is fitted into the support projection 95 on the crankcase 2 side by its elastic deformation.

That is, in order to fit the rubber mount 4 into the support protrusion 95, the small-diameter hole portion 4a on the upper surface of the rubber mount 4 is attached to the sharpened portion (corner portion of the wide portion 95b-2) of the collar portion 95b of the support protrusion 95. When the rubber mount 4 is pushed upward while being twisted and slightly twisted, the flange portion 95b of the support projection 95 is fitted into the small diameter hole portion 4a of the rubber mount 4 due to elastic deformation of the rubber mount 4, and in this state When 4 is pushed further upward, the flange portion 95b of the support protrusion 95 passes through the small diameter hole portion 4a of the rubber mount 4 and faces the large diameter hole portion 4b as shown in FIG. Then, the shaft portion 95a of the support protrusion 95 is fitted into the small-diameter hole portion 4a of the rubber mount 4, and the fitting of the rubber mount 4 into the support protrusion 95 is completed. In this way, the rubber mount 4 is attached to the support protrusion 95. When fitted, the rubber mount 4 is prevented from falling off the support projection 95 by the wide portion 95b-2 of the flange portion 95b. still,
The lower surface of the rubber mount 4 has a plurality of protrusions 4c as described above.
Therefore, when the engine generator 1 is installed on a flat floor surface, the rubber mount 4 does not act as a suction cup to prevent the engine generator 1 from coming off the floor surface.

By the way, the shape of the flange portion 95b of the support projection 95 integrally provided on the crankcase 2 is such that when the rubber mount 4 is fitted into the flange portion 95b.
If the rubber mount 4 is easily caught, and the rubber mount 4 is hard to be removed once it is fitted into the support protrusion 95,
In addition to the shape shown in FIG. 29, an oval shape shown in FIGS. 30 (a) and 30 (b), a special shape formed by shifting two semicircles shown in FIG. 30 (c), and the like can be adopted. .

As described above, in this embodiment, the support projection 95 is integrally formed on the crankcase 2, and the support projection 95 is formed.
Since the rubber mount 4 is directly fitted by utilizing its elastic deformation, the mounting structure of the rubber mount 4 is simplified, and the number of parts can be reduced and the cost can be reduced.

In the above, the mounting structure of the rubber mount 4 to the support projection 95 provided on the crankcase 2 has been described, but similar support projections (not shown) are also provided on both lower sides of the frame 3 of the generator 30. ) Is integrally projected, and a similar rubber mount 4 is similarly fitted and attached to the support protrusion.

Next, the operation of the engine generator 1 will be described.

To drive the engine generator 1, first, the engine switch 15 shown in FIG. 1 is turned on, and then the handle 10 of the recoil starter is pulled to start the two-cycle engine 21. At this time, the choke lever 16 is operated as needed to set the choke valve of the carburetor 32 to an appropriate opening.

When the engine 21 is started and the crankshaft 24 rotates, the rotor shaft 40 of the generator 30 coaxially connected to the crankshaft 24 and the rotor 41 connected to the rotor shaft 40 are separated. Rotates together with the crankshaft 24,
Rotation of the rotor 41 with respect to the stator 42 induces electromotive force to generate the required power. And
The electric power generated by the generator 30 is AC 220V outlet 14 (see FIG. 1) or DC 12V outlet 1
1 (see FIG. 4) is output and consumed via an electric cord (not shown) connected to 1 (see FIG. 4). It should be noted that the governor mechanism 73 (see FIG. 18) keeps the rotation speed of the two-cycle engine 21 substantially constant regardless of fluctuations in power consumption, that is, fluctuations in load.

By the way, by the rotation of the crankshaft 24, the cooling fan 25 (see FIG. 7) bound to the end portion of the crankshaft 24 also integrally rotates, and the cooling fan 2
By the rotation of 5, the cooling air (outside air) is introduced into the fan cover 9 through the cooling air introduction hole 9a (see FIG. 7) of the fan cover 9. Then, the cooling air introduced into the fan cover 9 flows through the scroll-shaped air passage 27 as indicated by the arrow in FIG. 8, and most of it is opened in the cylinder cover 28 as indicated by the arrow in FIG. From the portion 28a to the cylinder cover 2
8, part of which cools the cylinder 22 of the two-cycle engine 21, and other cooling air flows to the outside from an opening 28b that opens at the lower end of one end of the cylinder cover 28 as indicated by the arrow in FIG. It flows out and flows along the air guide walls 29A and 29B formed in the crankcase 2 in the direction of the arrow shown in the figure to cool the exhaust pipe 18 and the exhaust muffler 19.
The air guide walls 29A and 29B have a function of guiding the cooling air, and at the same time, they also function as a heat insulating plate that blocks the propagation of heat from the engine 21 to the floor surface.

In addition, the cylinder 22 inside the cylinder cover 28
The cooling air that has flowed around the periphery of the cylinder 22 to cool the cylinder 22 is the opening 2 of the cylinder cover 28 as indicated by the arrow in FIG.
After flowing out from 8c, it flows around the exhaust muffler 19 to cool the exhaust muffler 19.

On the other hand, another part of the cooling air flowing through the air passage 27 passes through the cooling air discharge port 31 (see FIGS. 7 and 8) formed in the flange portion 2b of the crankcase 2 and Part of it flows inside the resin case 12 to cool the electrical components such as the condenser 63 and the CDI unit 64 stored therein, and the remaining cooling air and the cooling air sucked from between the fan cover 9 and the case 12. As shown by the arrow in FIG. 7, the inside of the generator 30 from the plurality of cooling air introduction holes 23 formed in the split piece 2A-1 of the crankcase 2 and the cooling air exhaust port 31 opening to the air passage 27. And is used for cooling the inside of the generator 30. The cooling fan 46 (see FIG. 5) that is attached to the rotor shaft 40 of the generator 30 also rotates together with the rotor shaft 40, and the cooling fan 46 acts as an exhaust fan to cool the inside of the generator 30. The cooling air is forcibly discharged to the outside from the ventilation hole 47 (see FIG. 5) formed in the frame 3. The cooling air introduction hole 23 and the cooling air discharge port 31 are provided on the side (low temperature side) on which electrical components such as the condenser 63 and the CDI unit 64 are arranged.

As described above, in this embodiment, the cylinder 22 of the two-cycle engine 21 is tilted to one side,
Exhaust pipe 18 and exhaust muffler 1 which are high temperature parts in that direction
9 is arranged, and the air cleaner 62, the carburetor 32, the fuel cock 17, and other intake system parts, and the electric components such as the condenser 63 and the CDI unit 64 are arranged on the opposite side to the cooling air introduced into the fan cover 9. The high temperature side engine 21 and the low temperature side engine 21, the exhaust pipe 18, the exhaust muffler 19 and the low temperature side intake system parts, electrical components and generator 30 are separately supplied to cool them. Therefore, the cooling air can be effectively used, and the hot air on the engine 21 side does not flow to the low temperature side intake system parts or electrical components or the generator 30 side without providing a heat shield plate, etc. The components, the electrical components, and the generator 30 are reliably cooled by the cooling air having a low temperature. By cooling the intake system components such as the air cleaner 62 and the carburetor 32, the intake air flowing through them is effectively cooled, so that the charging efficiency of the two-cycle engine 21 is increased and the output thereof is improved.

Although the engine generator driven by the two-cycle engine has been described above, it is needless to say that the present invention includes the engine generator driven by the four-cycle engine.

[0101]

As is apparent from the above description, claim 1
According to the present invention described, the electric component is positively cooled by a part of the cooling air, so that the effect of effectively utilizing the cooling air can be obtained.

According to the second aspect of the present invention, since the engine cylinder, which is a high temperature component, is inclined and the electric components are arranged on the opposite side, the cooling air is divided into two systems, a high temperature side and a low temperature side. It can be supplied separately to the engine and low temperature side electrical components to cool them, and it is possible to prevent hot air from flowing from the engine side to the low temperature side electrical components without providing a heat shield plate etc. Therefore, the effect that the electric component can be surely cooled by the cooling air having a low temperature can be obtained.

According to the third aspect of the invention, the effect that the cooling air from the cooling fan can be introduced into the generator through the introduction hole and the generator can be surely cooled by the cooling air having a low temperature is obtained. To be

According to the fourth aspect of the present invention, since the carburetor and the air cleaner are provided on the low temperature side where the electrical components are arranged, these intake system components are also cooled by the cooling air having a low temperature flowing on the low temperature side, and these The intake air flowing through the intake system parts is effectively cooled, the charging efficiency of the engine is increased, and the output thereof is improved.

According to the fifth aspect of the invention, since the exhaust muffler, which is a high temperature component, is provided on the downstream side of the cylinder of the engine, the high temperature components are concentrated on one side, and a heat shield plate or the like is not provided. Even so, it is possible to effectively prevent the heat from the high temperature component from propagating to the low temperature side.

[Brief description of drawings]

FIG. 1 is a front view of an engine generator according to the present invention.

FIG. 2 is a plan view of an engine generator according to the present invention.

3 is a view in the direction of arrow A in FIG.

FIG. 4 is a view in the direction of arrow B in FIG.

FIG. 5 is a cutaway front view of the engine generator according to the present invention.

FIG. 6 is a cutaway rear view of the engine generator according to the present invention.

FIG. 7 is a cutaway plan view of the engine generator according to the present invention.

FIG. 8 is a side view of the engine generator according to the present invention viewed from the engine side with the fan cover removed.

9 is an enlarged sectional view taken along line CC of FIG.

FIG. 10 is a partially cutaway plan view on the generator side of the engine generator according to the present invention.

FIG. 11 is a cross-sectional view showing how to remove the cooling fan.

12 is a cross-sectional view taken along line DD of FIG.

13 is a sectional view taken along line EE of FIG.

FIG. 14 is a sectional view taken along line FF in FIG.

15 is a sectional view taken along line GG of FIG.

FIG. 16 is a partial front view showing a state in which a lower cover of the resin case is removed.

FIG. 17 is a plan sectional view of a resin case.

FIG. 18 is a plan view showing a governor mechanism and its adjusting mechanism.

19 is a cross-sectional view taken along the line HH of FIG.

20 is a view in the direction of arrow I in FIG.

FIG. 21 is a view similar to FIG. 20, showing another embodiment of the rotation stop portion of the thrust plate of the governor adjusting mechanism.

FIG. 22 is a side view of the exhaust muffler.

23 is a view in the direction of arrow J in FIG.

FIG. 24 is a side view showing the structure inside the first expansion chamber of the exhaust muffler.

25 is a cross-sectional view taken along line KK of FIG.

FIG. 26 is a sectional view taken along line LL in FIG. 24.

27 is a sectional view taken along line MM of FIG. 24.

FIG. 28 is an enlarged sectional view of a rubber mount mounting portion of the engine generator according to the present invention.

FIG. 29 is a bottom view of the rubber mount mounting portion of the engine generator according to the present invention.

FIG. 30 is a bottom view showing a modified example of the support protrusion that supports the rubber mount.

[Explanation of symbols]

 1 Engine Generator 19 Exhaust Muffler 21 Engine 22 Cylinder 23 Cooling Air Inlet 25 Cooling Fan 30 Generator 32 Carburetor 62 Air Filter 63 Condenser (Electrical Equipment) 64 CDI Unit (Electrical Equipment)

Claims (5)

[Claims] 1. An engine generator driven by an engine, wherein cooling air is supplied to a cylinder of the engine by a cooling fan, and a part of the cooling air is supplied to electrical components. Generator. 2. The engine generator according to claim 1, wherein the cylinder of the engine is inclined and an electric component is arranged on the opposite side of the cylinder. 3. A generator is connected to the side of the engine, and an introduction hole for introducing cooling air for cooling the inside of the generator is provided on the downstream side of the cooling fan. The engine generator according to 1 or 2. 4. The engine generator according to claim 1, wherein a carburetor and an air cleaner are arranged in the vicinity of electric components arranged on the opposite side of the cylinder of the engine. 5. An exhaust muffler is arranged on the side of the cylinder of the engine and on the downstream side of the cylinder of cooling air supplied to the cylinder. The listed engine generator.