JPS58197418A - Engine-driven generator - Google Patents

Abstract

PURPOSE:To reduce the discharging noise of exhaust gas in a captioned generator by providing a volute chamber around a cooling fan axially connected to the directly-connected shaft between a forcedly air-cooled engine and a generator and a cooling blast gate on a tail pipe of a muffler in an exhaust duct connected to the volute chamber. CONSTITUTION:An output shaft 4 of a forcedly air-cooled engine 2 is directly connected to a rotor-drive shaft 5 of a generator 3, and equipped with the shaft of a cooling fan 6 furnished with blades 6a and 6b on both sides. An exhaust duct 26 is connected into a soundproof case 1 between one side of a volute chamber 17 formed around the cooling fan 6 and the side of the generator 3, and a muffler body 27 is arranged therein. On a muffler tail pipe 32, a gate of cooling exhaust air is provided for sucking the cooling exhaust air into the tail pipe 32 by the ejector effect. This construction permits to reduce the discharging noise of exhaust gas.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine-driven generator that improves the exhaust treatment of engine exhaust gas and the cooled exhaust air that cools the forced air-cooled engine and generator.

Conventionally, in forced air-cooled engines and engine-driven generators, measures have been taken to mutually utilize cooling exhaust air and exhaust gas exhaust air, as shown in Japanese Utility Model Application Publication No. 49-46114, where the outlet of the exhaust pipe is connected to the engine. There are two types of exhaust pipes that open into the cooling air passage, and those that have an engine muffler located below the cooling outlet, as shown in Japanese Utility Model Application Publication No. 56-118928. However, in the conventional example described in the above-mentioned Japanese Utility Model Publication No. 49-46114, although exhaust gas and cooling exhaust air can be mixed, there is a drawback that the cylinder is contaminated by carbon etc. in the exhaust gas.

On the other hand, in the conventional example described in Japanese Utility Model Publication No. 56-118928, it can only be expected that the muffler will be somewhat cooled by the engine cooling exhaust air.

The present invention has been made in view of these circumstances, and includes arranging a muffler in an exhaust duct to cool the muffler, and opening an inlet and an inlet for cooling exhaust air in the tail pipe of the muffler to collect engine exhaust gas. and the cooling exhaust air to lower the temperature and pollution level of the exhaust gas, while the ejector effect of the exhaust flow of the exhaust gas sucks in the cooling exhaust air and improves the discharge of the cooling exhaust air. The exhaust gas is mixed with the cooling exhaust air in the muffler tail pipe, and the outlet of the muffler tail pipe is also opened in the exhaust duct inside the soundproof case, reducing the discharge noise of the exhaust gas and discharging it outside the soundproof case. In addition, the exhaust duct housing the muffler is arranged from the side of the volute chamber inside the soundproof case to the side of the generator, making it possible to create a compact engine-driven generator without taking up much space for the duct and muffler. The purpose is to provide.

The present invention will be specifically described below with reference to the drawings.

1 to 12 show one embodiment of the present invention, and a first embodiment of the present invention is shown in FIG.
The figure is a longitudinal sectional view of the engine-driven generator of this embodiment, Figure 2 is a side view of Figure 1, Figure 3 is a plan view of Figure 1 with the soundproof case cut away, and Figure 4 is A of Figure 1. -A cross-sectional view with the generator and fan omitted, Figure 5 is the 1st
Fig. 6 is a partially cutaway front view showing a part of the muffler, Fig. 7 is a plan view of the muffler shield shown in Fig. 6 with the muffler shield cut away, and Fig. 8 is a cutaway view of the muffler shield shown in Fig. 6. 9 is a sectional view taken along line C-C in FIG. Figure 12 is a front view showing the fan (also used as a flywheel) equipped with a magnet for use with the ignition coil.
ll sectional view.

In these figures, reference 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 a generator 3 is connected to the output shaft 4 of the engine 2.
The rotor drive shaft 5 is connected to constitute an engine-directly connected type generator. The engine output shaft 4 has a first tapered portion 4a whose diameter increases toward the engine 2 side.
and a second tapered part 4b which similarly becomes larger in diameter toward the engine 2 side at the tip, and a male threaded part 4G is formed at the front (on the anti-engine side) adjacent to this first taper ali4a. . 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. These are the respective first and ninth taper portions 4a of the engine output shaft 4.

This is to prevent damage caused by collision with stones during polishing of 4b. A boss portion having a tapered ring receiving hole of a fan 6 which also serves as a fly hole is fitted into the first tapered portion 4a of the engine output shaft 4, and a key is engaged therein.
A nut 7 is screwed into the male threaded portion 4C located on the back side of the fan 6, and the nut 7 presses and presses the fan 6 in the direction of the expansion of the diameter of the first tapered portion 4a, thereby fixing the fan 6. 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 in the direction. This tapered opening 5a fits the second tapered portion 4b of the engine output shaft 4, and the second tapered portion 4b is fitted into the tapered opening 5a.
A screw hole 4d communicating with the hollow of the rotor drive shaft 5 is formed in the central axis direction of b. Then, a bolt 7a is screwed into the hollow of the rotor drive shaft 5 from the copper end surface opposite to the engine of the rotor drive shaft 5, and the end of the bolt 7a is inserted into the tapered opening 5a of the engine output shaft 5. 2-tabar part 4
b into the threaded hole 4d, and pull the second tapered part 4b toward the tapered opening 5a so that both tapered parts are bitten, thereby firmly connecting the engine output shaft 4 and the rotor drive shaft 5. It has become.

The soundproof case 1 housing the directly connected forced air-cooled engine 2 and generator 3 is installed on the bottom surface of the engine 2, that is, on the bottom surface of the portion facing the oil pan 8, and on the bottom surface of the portion facing the oil pan 8.
A cooling air inlet 10 is formed at a side surface where an inlet 9 for injecting engine oil is disposed, and at a position where the inlet 9 is exposed. Also, the soundproof case 1 and the crank case 11 of the engine 2. Oil pan8. The space between the cylinder 12° and the generator 3 is excessively narrowed to form a cooling air passage 13. On the other hand, the air intake port 15 of the air cleaner 14 provided 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 suction sound does not leak out of the soundproof case 1.

The bearing plate 16 of the engine 2 is arranged on the generator 3 side, and this bearing plate 16 has an extension portion 16a extending toward the generator 3 side.

The extending portion 16a of the bearing plate 16 is formed with a porlute chamber forming portion 16b in the middle and a stator mounting portion 16C at the tip. The volute forming portion 16b surrounds the engine 2 and the generator 3 to form a volute chamber 17 separated from the cooling air passage 13, and a fan 6 pivotally attached to the engine output shaft 4 is disposed in the volute chamber 17. It is set up. On the other hand, the stator attachment portion 16c is attached to the engine-side stator 18 of the generator 3 while holding the outer periphery thereof.

Further, the outer periphery of the cylinder 12 of the engine 2 is surrounded by a baffle plate 19, forming an engine cooling air passage 20 separated from the cooling air passage 13.

This engine cooling air passage 20 has a cooling air passage 13 at the bottom.
An inlet 21 is opened which communicates with the inlet. On the other hand, this engine cooling air passage 20 has its outlet 22 connected to the bearing plate 1.
An opening is formed in the volute forming portion 166 of No. 6 to communicate with the volute chamber 17.

A bearing plate 23 is disposed on the side of the generator 3 opposite to the engine and supports the zero-drive shaft 5 via a bearing, and this bearing plate 23 extends upward toward the engine to support the stator. It supports and attaches the outer periphery of No. 18 on the side opposite to the engine. Further, this bearing plate 23 is provided with an inlet 24 that communicates the inside of the generator 3 with the cold 1111 passage 13.

On the other hand, the engine side of the generator 3 is opened and communicated with the porlute chamber 17. In addition, near the inlet 24 of the bearing plate 23, there is a semiconductor for controlling the generator, etc.
Electrical components 25 that are sensitive to heat are disposed and are cooled by cooling air flowing into the generator 3 from the cooling air passage 13.

Furthermore, an inlet 26a is provided on one side of the volute chamber forming portion 16b of the bearing plate 16 forming the volute chamber 17.
An air exhaust duct 26 having an air exhaust duct 26 is connected thereto, and an air exhaust port 17a communicating with the outside via the inside of the air exhaust duct 26 is formed. Incidentally, exhaust ports 17a are formed on both sides of the volute chamber forming portion 16b, and an exhaust duct 2 is formed on one side.
6 is connected to communicate with the outside through the air exhaust duct 26, and the air exhaust port on the other side is opened directly to the outside to connect the soundproof cover 1.
Alternatively, if openings (for ventilation ports) are formed on both sides of the volute forming part 16b and only copper is used as the ventilation duct 26. is used by closing the other opening with a shielding plate.

The fan 6, which is pivotally attached to the engine output shaft 2 and arranged inside the polycoat chamber 17, has shoulders 5a on both sides.

6b4r, the cooling air is introduced from the cooling air inlet 10 into the polycoat chamber 17 through the cooling air passage 13 → engine cooling air passage 20 → inlet 22. In particular, the introduced cooling air is cooled through the cooling air passage 1.
3 → Inlet port 24 of generator bearing root 23 → Generator 3
Soundproof case 1 is inhaled into the polycoat chamber 17 through the inside.
The inside of the electrical component 2 is ventilated to prevent heat buildup, and the electrical component 2 is placed near the inlet 24 of the bearing plate 23 as described above.
5 and then the generator 3.

The exhaust duct 26 is arranged in a relatively long shape in the soundproof case 1 from the side surface of the volute chamber 17 to the side surface of the generator 3 on the side opposite to the engine.
A muffler body 27 is arranged inside. The muffler body 27 has longitudinal recesses 28 on its outer surface.
A plurality of convex portions 29 are formed alternately above and below, while concave portions of the muffler body 27 are formed on the outer surface of the exhaust duct 26.
A plurality of recesses 81 are symmetrical in the plane at positions corresponding to the convex portions 28° and 29.
130... and convex parts 31... are formed, and convex parts 29, 31 of 26 are formed on the muffler body 27 and the exhaust duct 1.
The muffler body 27 is attached within the exhaust duct 26 by joining them together and screwing or welding them together. and,
The muffler tail pipe 32 in the longitudinal direction is formed by the recess 28 of the muffler body 27 and the recess 30 of the exhaust duct 26.
... are formed vertically, and a muffler cooling air passage 33 is formed on the outer periphery of the muffler body 27, and this muffler cooling air passage 33 and both ends of the muffler tail pipe 32... are communicated with each other. . Further, an exhaust port 34 is formed at the end of the outer surface of the exhaust duct 26 on the side opposite to the engine, and communicates with an exhaust port 35 formed in the soundproof case 1 and open to the outside. On the other hand, muffler body 27
is a partition stretched in the internal longitudinal direction! ! 36, a first expansion chamber 37 is formed on the inner side and a second expansion chamber 38 is formed on the outer side, and the two chambers are partitioned by I! Numerous communicating holes 39 drilled in 36
It is connected by...

In addition, in each recess 28 of the muffler body 27,
A plurality of communication small holes 40... are bored, and communicate the second expansion chamber 38 with the plurality of muffler tail pipes 32.... Further, an engine exhaust pipe 41 is inserted into the first expansion chamber 37 on the engine side thereof.

Further, the ignition coil 42 is disposed in the cooling air passage 13 located above the volute chamber forming portion 16b of the bearing plate 16, and is mounted by drilling only the iron core 43 into the volute chamber forming portion 16b. From the hole to the volute chamber 17
The ignition coil 42 is inserted into the volute chamber 17 so that the flow of cooling air within the volute chamber 17 is not obstructed by the ignition coil 42. Furthermore, this ignition coil 42 is located away from the high part of the cylinder 12 and the like, and furthermore,
Because it is located inside, temperature rise is prevented. On the other hand, the fan 6 which also serves as a flywheel has recesses formed at symmetrical positions on the outer periphery, one layer of magnetized steel plates 44 is disposed in one of the recesses, and a layer of magnetized steel plate 44 is disposed in the other recess for balance purposes. Non-magnetized steel plate 45...heavily arranged.

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

In such a configuration, when the fan 6 is rotated by the drive of the engine 2, the cold I! The J wind flows into the cooling air passage 13 inside the soundproof case 1 from the cooling air introduction ports 10 formed on the bottom and side surfaces of the soundproof case 1, hits the oil pan 8, and cools the oil pan 8. . A part of this inflow cooling air flows from the air intake port 15 to the air cleaner 14.
The other part is sucked into the cylinder 12 by the air guide plate 19.
The air flows into the engine cooling air passage 13 formed around the outer periphery, cools the cylinder 12, and is sucked into the volute chamber 17 through the outlet 22. In addition, a part of the cooling air is ventilated by passing through the cooling air passage 13f to the side opposite to the engine of the generator 3, and a part of the cooling air cools the ignition coil 42 and the electrical components 25, and is formed on the side opposite to the engine of the generator 3. The water flows into the generator 3 through the inlet 24 , cools the generator 3 , and then is sucked into the volute chamber 17 . In this way, since the fan 6 is of a double-side suction type, cooling air is sucked into the volute chamber 17 from both the engine 2 side and the generator 3 side, cooling the necessary parts and ventilating the inside of the soundproof case 1. It is supposed to be done.

On the other hand, the cooling exhaust air that has flowed into the volumes 1 to 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 of the body 27 and reaches the exhaust port 34 on the side opposite to the engine of the exhaust duct 26, cooling the muffler body 27.
The rest is the engine side of the muffler tail pipe 32...
It flows into the muffler tail pipe 32 . It is mixed with the circulating cooling exhaust air and discharged to the outside. Here, the cooling exhaust air is generated by the ejector effect of engine exhaust gas discharged into the muffler tail pipes 32 and discharged to the outside from the exhaust port 34 of the exhaust duct 26.
- At the same time, 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, which is sucked in and exhausted to the outside from the exhaust port 34 of the exhaust duct 26, resulting in cooling. Exhaust air is efficiently discharged.

Further, the engine exhaust gas discharged from the engine exhaust pipe 41 into the muffler body 27 first flows into the first expansion chamber 37 and is expanded and depressurized, and then passes through the communication holes 39 and 39 of the partition plate 36.
... flows into the second expansion chamber 38, where it is expanded and decompressed again, and is discharged into the muffler tail pipe 32 through the small communication holes 40. 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 has a muffler cooling air passage 3.
3, and since the exhaust gas itself is mixed with the cooling exhaust air within the muffler tail pipe 32 and at the exhaust port 34, the engine exhaust gas is discharged to the outside with reduced temperature and pollution. be done.

Figure 13 and 1145i! 1 shows 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 rear view of this fan.
FIG. In this embodiment, the fan 5°, which also serves as a flywheel, is formed in a single-wheel type and a double-sided type.

That is, 1151... are formed only on the engine side, and a large number of communication holes 52... that communicate the engine side and the anti-engine side are formed in the bearing boss 531Il with the 1151... The communication holes 52 are 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. This fruit gI! example fan 5
0 and the fan 6 of the first embodiment have the same function.

In addition, in the above embodiment, cold jiI]! Although the introduction port 10 is formed on the bottom of the midwife case 1 near the position facing the oil pan and on the side surface, for example near the oil inlet, this cold IIJ air introduction port 10 is provided only on the bottom of the soundproof case 1,
Moreover, it may also be provided near the generator 3.

As explained above, according to the present invention, since the muffler is disposed within the exhaust duct, the muffler can be cooled, and since the exhaust inlet of the cooling exhaust air is opened in the tail pipe of the muffler, By mixing engine exhaust gas and cooling exhaust air, the temperature and pollution level of the exhaust gas can be lowered, and the ejector effect of the exhaust flow of the exhaust gas can suck in the cooling exhaust air and improve the discharge of the cooling air. The exhaust gas mixes with the cooling exhaust air in the muffler tail pipe, and the outlet of the muffler tail pipe opens into the exhaust duct inside the soundproof case, reducing the discharge noise of the exhaust gas and allowing it to flow out of the soundproof case. An air exhaust duct that can be discharged and houses a muffler is arranged from the side of the volute chamber to the side of the generator in the soundproof case, which has the effect of making it possible to have a compact configuration without taking up much space.

[Brief explanation of drawings]

1 to 12 show a first embodiment of the present invention, FIG. 1 is a longitudinal sectional view of an engine-driven generator, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a cutaway of the soundproof case. Fig. 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. 5 is a sectional view of Fig. Figure 6 is a front view with the ventilation duct cut out, Figure 7 is a plan view with the ventilation duct cut out, Figure 8 is a 5-SS sectional view of Figure 7, and Figure 9 is 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 fan (
12 is a sectional view taken along line D-D in FIG. 11, and FIG.
14 shows a second embodiment of the fan, FIG. 13 is a curved view, and FIG. 14 is a cross-sectional view taken along the line E--E in FIG. 13. 1...Soundproof case, 2...Forced air cooling engine, 3
... Generator, 4... Output shaft, 5... Rotor drive shaft, 6.50... Fan, 1o... Cooling air inlet, 13... Cooling air passage, 17... Volute Chamber, 20...Engine cooling air passage, 21.
...Inlet, 22...Outlet, 24...Inlet,
26... Exhaust duct, 27... Muffler body, 32... Muffler tail pipe, 33... Muffler cooling air passage, 34. 35... Exhaust air outlet, 4
1...Exhaust pipe. Fig. 8 2737 Fig. 9 Fig. 10, -. -D

Claims (1)

[Claims] 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 is attached to the directly connected shaft of the leap between the engine and the generator. A volute chamber is formed between the engine and the generator in which the fan is installed, and cooling air is sucked from the engine side and the generator side, and an exhaust duct is connected to an exhaust port formed on one side of the volute chamber. The exhaust duct is arranged in a soundproof case extending from the side of the volute chamber to the side of the generator, a muffler body to which an engine exhaust pipe is connected is arranged in the duct, and a muffler tail pipe is connected to the muffler body, An inlet and an inlet for cooling exhaust air are formed in the muffler tail pipe to suck the cooling exhaust air in the exhaust gas exhaust flow, and after mixing the engine exhaust gas and the cooling air, the mixed exhaust gas and the cooling air are mixed. An engine-driven generator, characterized in that the generator is configured to discharge air from a duct and an exhaust outlet of a soundproof case.