JPH0219553Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a soundproof engine drive that prevents the temperature of the ignition coil itself from rising and at the same time allows a good flow of cooling air to cool the engine and generator. It concerns generators.

[Problems to be solved by conventional techniques and ideas] Conventionally, ignition coils for external magnetic type magnetos have been disclosed in, for example, Japanese Utility Model Application Publication No. 53-133011 and Japanese Utility Model Application Publication No. 53-1989.
As described in Japanese Patent No. 132508, it was disposed near the cylinder wall in the baffle plate covering the cylinder, that is, in the volute chamber. For this reason, this ignition coil obstructs the flow of cooling air in the volute chamber, causing not only the problem that the cooling air does not flow properly, but also the ignition coil that is close to high temperature parts such as the cylinder. The temperature of the coil itself also increases, causing damage to the coil.

A prior art example in which only the iron core part of the ignition coil is inserted into the volute chamber (inside the fan case) of the engine, while the ignition coil itself is exposed to the outside, is disclosed in Utility Model Application Publication No. 57-95428. It can be found in the official gazette, Utility Model Application Publication No. 55-20680.

However, these prior art examples relate to a single engine, and the iron core portion is exposed to the outside air. The entire ignition coil is housed in a soundproof case, and as a result, there is no problem that heat tends to be trapped in the soundproof case, and this heat can cause temperature rise and damage to the ignition coil itself.

The present invention was developed in view of these circumstances, and is designed to effectively cool both the engine and generator, which are especially surrounded by a soundproof case, without interfering with the circulation of cooling air in the volute room by the ignition coil. In addition, the ignition coil is cooled by the cooling air flowing through the cooling air passage before cooling the engine or generator, and the ignition coil is kept away from high-temperature areas such as cylinders. This synergistic effect ensures that the temperature of the ignition coil does not rise even in a soundproof engine-driven generator that houses the ignition coil in a soundproof case. It is an object of the present invention to provide a soundproof engine-driven generator that can prevent noise from occurring.

[Means for Solving the Problems] In order to achieve the above problems, a soundproof engine-driven generator according to the present invention has a forced air-cooled engine and a generator arranged in a soundproof case, and the output shaft of the engine and the rotor of the generator are driven. Directly connect to the shaft,
A fan that also serves as a flywheel is attached to a shaft directly connected to the engine and the generator, and a cooling air inlet is formed on the bottom surface of the soundproof case or on the side surface on the engine side, so that the soundproof case and the engine crank are connected. A cooling air passage is formed between the case, the oil pan, the cylinder and the generator, a volute chamber is formed between the engine in which the fan is arranged and the generator and the cooling air passage, and the cylinder of the engine is formed as a baffle plate. An engine cooling air passage is formed by covering the engine cooling air passage so as to be separated from the cooling air passage and having an inlet opening into the cooling air passage, and an outlet of the engine cooling air passage opening into the volute chamber. Tsusion coil,
Inside a cooling air passage formed between the soundproof case, the fuel tank, and the outer periphery of an extension of an engine bearing plate forming the volute chamber, facing a magnetic copper provided on a fan that also serves as a flywheel in the volute chamber. disposed on the outer periphery of the extending portion of the bearing plate;
Only the iron core of the ignition coil is inserted into the volute chamber.

[Embodiments of the invention] The invention will be specifically described below with reference to the drawings.

1 to 12 show a first embodiment of the present invention, FIG. 1 is a longitudinal sectional view of the engine-driven generator of this embodiment, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a soundproofing Figure 4 is a cross-sectional view taken along line A-A in Figure 1 with the generator and fan omitted; Figure 5 is a cross-section of the soundproof cover in Figure 1 with the case cut away. Figure 6 is a partially cutaway front view showing the muffler part, Figure 7 is a plan view of the muffler cover in Figure 6 with the muffler cover cut away, Figure 8 is a sectional view taken along line B-B in Figure 7, Figure 9 is a sectional view taken along the line C-C in Figure 8, Figure 10 is an enlarged front view of the tip of the output shaft of the engine that connects the rotor drive shaft of the generator, and Figure 11 is a view of the fan (flywheel) equipped with the magnet for the magnet. FIG. 12 is a sectional view taken along the line DD in FIG. 11.

In these figures, numeral 1 is a soundproof case, 2 and 3 are a forced air-cooled engine and a generator housed and arranged inside this soundproof case 1, and the rotor drive shaft 5 of the generator 3 is connected to the output shaft 4 of the engine 2. It constitutes a generator that is directly connected to the engine. The engine output shaft 4 is connected to the engine 2 midway.
It has a first tapered part 4a whose diameter becomes larger toward the side, and a second tapered part 4b whose diameter becomes larger towards the engine 2 side at the tip end, similar to the first tapered part 4a.
A male threaded portion 4c is formed at the front (on the side opposite to the engine) adjacent to the first tapered portion 4a. Then, as shown in FIG. 10, the first tapered portion 4a
and the second tapered portion 4b are configured such that their respective extension lines do not overlap the other tapered portion. this is,
Each first and second tapered portion 4a of the engine output shaft 4,
This is to prevent damage caused by the grindstone colliding with each other during polishing of 4b. A boss portion having a tapered bearing hole of a fan 6 which also serves as a flywheel is fitted into the first tape portion 4a of the engine output shaft 4, and a key is engaged therein, and the key is inserted into the first tape portion 4a of the fan 6, which also serves as a flywheel. A nut 7 is screwed onto the male threaded portion 4c, and the fan 6 is pressed and crimped in the diametrically expanding direction of the first tapered portion 4a and fixed by the nut 7. Further, the rotor drive shaft 5 of the generator 3 is formed in a hollow shape penetrating in the axial direction, and the end opening 5a on the engine side is formed on the end surface so as to coincide with the second tapered portion 4b of the engine output shaft 4. It is formed in a tapered shape that widens toward the front. This tapered opening 5a
The second tapered portion 4b of the engine output shaft 4 is fitted therein, and a screw hole 4d communicating with the hollow of the rotor drive shaft 5 is formed in the direction of the central axis of the second tapered portion 4b. Then, a bolt 7a is screwed into the hollow of the rotor drive shaft 5 from the end surface on the side opposite to the engine of the rotor drive shaft 5, and the second taper of the engine output shaft 4 whose tip is fitted into the tapered opening 5a of the rotor drive shaft 5. The second tapered portion 4b is screwed into the screw hole 4d of the portion 4b, and the second tapered portion 4b is pulled toward the tapered opening 5a so that both tapered portions are bitten, thereby firmly connecting the engine output shaft 4 and the rotor drive shaft 5. It's summery.

The soundproof case 1 housing the directly connected forced air-cooled engine 2 and generator 3 has a bottom surface of the engine 2, that is, a bottom surface of the portion facing the oil pan 8, and an injection port 9 for injecting engine oil into the oil pan 8. A cooling air inlet 10 is formed at a position where the inlet 9 is exposed on the side surface where the inlet 9 is disposed. In addition, the soundproof case 1, the crankcase 11 of the engine 2, the oil pan 8, and the cylinder 1
2 and the generator 3 is appropriately narrowed to form a cooling air passage 13. On the other hand, the air intake port 15 of the air cleaner 14 disposed on the side of the engine 2 is arranged so as not to face the cooling air inlet 10 of the soundproof case 1, so that the air intake sound leaks outside the soundproof case 1. I've learned not to let it out.

The bearing plate 16 of the engine 2 is connected to the generator 3
This bearing plate 16 has an extending portion 16a extending toward the generator 3 side.
The extending portion 16a of the bearing plate 16 has a circular volute chamber forming portion 16b and a stator mounting portion 16c at the tip. The volute chamber forming part 16b is a volute chamber 17 that surrounds the space between the engine 2 and the generator 3 and is divided into a cooling air passage 13.
A fan 6 which is pivotally attached to the engine output shaft 4 is disposed in the volute chamber 17. on the other hand,
The stator attachment portion 16c is attached to the generator 3 while holding the outer periphery of the engine side stator 18.

In addition, the outer periphery of the cylinder 12 of the engine 2 is covered with a baffle plate 1.
9, forming an engine cooling air passage 20 separated from the cooling air passage 13. The engine cooling air passage 20 has an introduction port 21 at its lower portion that communicates with the cooling air passage 13. On the other hand, the engine cooling air passage 20 has its outlet 22 opened in the volute chamber forming portion 16b of the bearing plate 16 to communicate with the volute chamber 17.

A bearing plate 23 is disposed on the opposite side of the generator 3 to support the rotor drive shaft 5 via a bearing, and the upper part of the bearing plate 23 extends toward the engine to support the stator 18. It is attached to support the outer periphery on the side opposite to the engine. Moreover, this bearing plate 23 is provided with the inside of the generator 3 and the cooling air passage 1.
3 is opened.
On the other hand, the engine side of the generator 3 is opened and communicated with the volute chamber 17. Incidentally, near the inlet 24 of the bearing plate 23, electrical components 25 that do not tolerate high temperatures, such as semiconductors for controlling the generator, are arranged, and are cooled by the cooling air flowing into the generator 3 from the cooling air passage 13. It's becoming like that.

Further, as shown in FIG. 4, an exhaust duct 26 having an inlet 26a is connected to one end surface of the volute chamber forming portion 16b of the bearing plate 16 forming the volute chamber 17. An air exhaust port 17a communicating with the outside through the inside of the air outlet 26 is formed. In addition, the volute chamber forming part 1
6b is formed with an air exhaust port 17a on both end faces, an air exhaust duct 26 is connected to one side to communicate with the outside via the air exhaust duct 26, and an air exhaust port on the other side is opened directly to the outside to form a soundproof cover. Alternatively, in the case where openings (for exhaust ports) are formed on both sides of the volute chamber forming part 16b, only the exhaust duct 26 side is used. In this case, the other opening is used by closing it with a shielding plate.

The fan 6, which is attached to the engine output shaft 2 and arranged in the volute chamber 17, is formed in a double-sided suction type having blades 6a and 6b on both sides, as shown in FIG. Wind introduction port 10...
The cooling air introduced from ... is sucked into the volute chamber 17 through the cooling air passage 13 → the engine cooling air passage 20 → the outlet 22 to cool the engine 2 in particular. , the cooling air passage 13 → the inlet 24 of the generator bearing plate 23 → the inside of the generator 3 is sucked into the volute chamber 17 to ventilate the inside of the soundproof case 1 and prevent heat buildup, and as described above, the bearing plate 23 inlet 2
Electrical components 25 placed near generator 4 are cooled, and then generator 3 is cooled.

The exhaust duct 26 is arranged in a relatively long shape in the soundproof case 1 from the side of the volute chamber 17 to the side of the generator 3 opposite to the engine, and as shown in FIG. A muffler body 27 is arranged inside. A longitudinal recess 2 is provided on the outer surface of the muffler body 27.
A plurality of convex portions 8 and 29 are formed alternately above and below, while a plurality of plane-symmetrical convex portions 28 and 29 are formed on the outer surface of the exhaust duct 26 at positions that coincide with the concave and convex portions 28 and 29 of the muffler body 27. Concave portions 30 and convex portions 31 are formed, and the convex portions 29 and 31 of the muffler body 27 and the exhaust duct 26 are joined together and fixed with screws or welded to connect the muffler body 27 to the exhaust duct. It is installed inside 26. Then, the recess 28 of the muffler body 27 and the recess 3 of the exhaust duct 26
0 and longitudinal muffler tail pipe 3
2... are formed vertically, and a muffler cooling air passage 3 is formed on the outer periphery of the muffler body 27.
3, and this muffler cooling air passage 33
and both ends of the muffler tail pipe 32... are communicated with each other. Further, as shown in FIG.
is formed and communicates with a discharge port 35 formed in the soundproof case 1 and open to the outside. On the other hand, as shown in FIG. 8, the muffler body 27 has a first expansion chamber 37 formed inside and a second expansion chamber 38 formed outside by a partition wall 36 extending in the internal longitudinal direction. The chambers are communicated through a large number of small communication holes 39 bored in the partition wall 36. Further, each recess 28 of the muffler body 27 is provided with a plurality of communicating small holes 40, which connect the second expansion chamber 38.
and a plurality of muffler tail pipes 32... are communicated with each other. Further, an engine exhaust pipe 41 is inserted into the first expansion chamber 37 on the engine side.

Further, the ignition coil 42 is connected to the bearing plate 16.
The iron core 43 is disposed in the cooling air passage 13 located at the upper part of the volute chamber forming part 16b.
is inserted into the volute chamber 17 through a mounting hole drilled in the volute chamber forming portion 16b, so that the flow of cooling air within the volute chamber 17 is not obstructed by the ignition coil 42. . Further, since the ignition coil 42 is located away from high temperature parts such as the cylinder 12 and within the cooling air passage 13, a rise in temperature is prevented. On the other hand, in the fan 6 which also serves as a flywheel, recesses are formed at symmetrical positions on the outer circumferential side, and within one of the recesses, a magnetized steel plate 44...
are arranged in layers, and balanced non-magnetized steel plates 45 are arranged in layers in the other recess.

In the figure, reference numeral 46 indicates a recoil starter, 47 a fuel tank, 48 a rotor, and 49 a leg piece.

In such a configuration, when the fan 6 rotates due to the drive of the engine 2, the cooling air flows through the soundproof case 1.
Cooling air inlets 10 formed on the bottom and side surfaces of...
... flows into the cooling air passage 13 in the soundproof case 1 and hits the oil pan 8 to cool the oil pan 8. A part of this incoming cooling air is sucked into the air cleaner 14 from the air intake port 15, and the other part is drawn into the engine cooling air passage 20 formed by surrounding the outer periphery of the cylinder 12 with the baffle plate 19. The air flows in, cools the cylinder 12, and is sucked into the volute chamber 17 through the outlet 22. In addition, a part of the cooling air flows through the cooling air passage 13 to the opposite side of the generator 3 for ventilation, and a part of the cooling air cools the ignition coil 42 and the electrical components 25 to the side opposite to the engine of the generator 3. The water flows into the generator 3 through an inlet 24 formed in the volute, cools the generator 3, and is then sucked into the volute chamber 17. In this way, since the fan 6 has a suction system on both sides,
Cooling air is drawn into the volute chamber 17 from both the engine 2 side and the generator 3 side, thereby cooling the necessary parts and ventilating the inside of the soundproof case 1.

On the other hand, the cooling exhaust air that has flowed into the volute chamber 17 is discharged into the exhaust duct 26 through the exhaust port 17a of the volute chamber forming part 16b and the inlet 26a of the exhaust duct 26, and a part of it is discharged into the exhaust duct 26. It flows through the muffler cooling air passage 33 on the outer periphery, reaches the exhaust port 34 on the side opposite to the engine of the exhaust duct 26, and cools the muffler body 27. The tail pipe 32 mixes with the engine exhaust gas, reaches the exhaust port 34 on the side opposite to the engine of the exhaust duct 26, and the cooling exhaust gas flows through the muffler cooling air passage 33 within the exhaust port 34. It is mixed and discharged outside. put it here,
The cooling exhaust air is sucked into the muffler tail pipe 32 due to the ejector effect of the engine exhaust gas discharged into the muffler tail pipe 32 and discharged to the outside from the exhaust port 34 of the exhaust duct 26. , the exhaust port 3 of the exhaust duct 26
The cooling exhaust air in the muffler cooling air passage 33 is sucked into the exhaust port 34 by the ejector effect of the engine exhaust gas discharged to the outside from the muffler cooling air passage 33, and as a result, the cooling exhaust air is efficiently discharged.

Also, from the engine exhaust pipe 41 to the muffler body 2
The engine exhaust gas discharged into the first expansion chamber 37 first flows into the first expansion chamber 37 and is expanded and depressurized, and then flows into the second expansion chamber 38 through the communication holes 39 of the partition plate 36, where it flows into the second expansion chamber 38. It is inflated and decompressed again at the
0... and is discharged into the muffler tail pipe 32... Since the muffler tail pipes 32 are formed inside the soundproof case 1, the discharge noise is reduced and discharged to the outside. Furthermore, the muffler body 27 is surrounded by a muffler cooling air passage 33, and since the exhaust gas itself is mixed with cooling exhaust air in the muffler tail pipe 32 and at the exhaust port 34, the engine exhaust gas is The gas is exhausted to the outside with reduced temperature and pollution.

13 and 14 show a second embodiment of the fan used in the engine-driven generator of the present invention, FIG. 13 is a rear view of this fan, and FIG. 14 is a FIG. Fan 50 that also serves as a flywheel in this embodiment
is a single-blade type with suction on both sides. That is, the wings 51... are formed only on the engine side, and a large number of communication holes 52... that connect the engine side and the anti-engine side are formed in the wings 51...
... and the bearing boss 53, and the communication hole 52... is formed in a short cylindrical shape in the axial direction so as to suck air from the side opposite to the engine into the engine side.
The functions of the fan 50 of this embodiment and the fan 6 of the first embodiment are the same.

In the above embodiment, the cooling air inlet 10 is formed near the oil pan facing position on the bottom of the soundproof case 1 and on the side surface, for example, near the oil inlet. It may be provided only on the bottom surface of the generator 1 and may also be provided near the generator 3.

[Effect of the invention] As explained above, according to the invention, the ignition coil does not obstruct the circulation of cooling air in the volute room, and both the engine and the generator, which are surrounded by a soundproof case, can be effectively operated. The ignition coil is cooled by the cooling air flowing through the cooling air passage before the engine or generator is cooled, and the ignition coil is cooled by the cooling air flowing through the cooling air passage before cooling the engine or generator. The synergistic effect of separating the ignition coil from the high-temperature part to eliminate heat transfer from the engine reduces the temperature rise of the ignition coil even in a soundproof engine-driven generator that houses the ignition coil in a soundproof case. There is a definite preventive effect.

[Brief explanation of the drawing]

Figures 1 to 12 show a first embodiment of the present invention, Figure 1 is a longitudinal sectional view of an engine-driven generator, Figure 2 is a side view of Figure 1, and Figure 3 is a cutaway of the soundproof case. 1 is a plan view, FIG. 4 is a sectional view taken along the line A-A in FIG. 1, with the generator and fan omitted, and FIG. Figure 6 is a partially cutaway front view showing the muffler section, Figure 7 is a plan view of the muffler cover shown in Figure 6 with the cutout removed, and Figure 8 is a view taken along B-B in Figure 7.
Figure 9 is a cross-sectional view taken along line C-C in Figure 8, Figure 10 is an enlarged front view of the tip of the output shaft of the engine that connects the rotor drive shaft of the generator, and Figure 11 is the arrangement of the magnet for the magnet. Figure 12 is a front view showing the fan (also used as a flywheel) and the ignition coil.
3 and 14 show a second embodiment of the fan,
Figure 13 is a rear view, Figure 14 is E-E of Figure 13.
FIG. 1...Soundproof case, 2...Forced air cooling engine,
3... Generator, 4... Output shaft, 5... Rotor drive shaft, 6, 50... Fan, 10... Cooling air inlet, 13... Cooling air passage, 17... Volute chamber, 17a... Exhaust Air port, 20...Engine cooling air passage, 21...Inlet, 22...Outlet, 24...
...Inlet, 26...Exhaust duct, 42...Ignition coil, 43...Iron core.

Claims (1)

[Scope of utility model registration request] A forced air-cooled engine and a generator are arranged in a soundproof case, the output shaft of the engine is directly connected to the rotor drive shaft of the generator, and a fan that also serves as a flywheel is attached to the shaft directly connected to the engine and the generator. A cooling air inlet is formed on the bottom surface of the soundproof case or on the side surface on the engine side, and a cooling air passage is formed between the soundproof case and the crankcase, oil pan, cylinder, and generator of the engine, and the fan is A volute chamber is formed between the disposed engine and the generator, which is separated from the cooling air passage, and the cylinder of the engine is covered with a baffle plate to be separated from the cooling air passage, and an inlet is provided in the cooling air passage. opening to form an engine cooling air passage, while opening an outlet of the engine cooling air passage to the volute chamber;
An ignition coil is formed between the soundproof case, the fuel tank, and the outer periphery of the extension of the engine bearing plate forming the volute chamber, facing the magnetic copper provided on the fan that also serves as a flywheel in the volute chamber. 1. A soundproof engine-driven generator, characterized in that the ignition coil is disposed on the outer periphery of the extending portion of the bearing plate in the cooling air passage, and only the iron core of the ignition coil is inserted into the volute chamber.