JPS58197417A - Engine-driven generator - Google Patents

Abstract

PURPOSE:To simplify the structure of a captioned generator by connecting the shaft of a cooling fan to the directly-connected shaft between a forcedly air- cooled engine and a generator and extending a bearing plate of the engine to the generator side for providing a volute chamber furnished inside the fan and a stator-fixing part of the generator. 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 a cooling fan 6 provided with blades 6a and 6b on both sides. A bearing plate 16 of the output shaft 4 of the engine is extended to the side of the generator 3 for forming volute chamber formation parts 16a and 16b to be furnished inside the cooling fan 6 and a fixing part 16c of a stator 18 of the generator 3. Volute chamber formation parts 16b and 16c are respectively connected to outlets of an engine-cooling-blast passage and a generator-cooling-blast passage for improving the cooling in both of them. Meanwhile, the monobloc shaping of the bearing plate 16 and the stator-fixing part 16c permits to reduce the number of parts.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine-driven generator in which a volute chamber is formed by the bearing plates of the engine and which support and mount a stator of the generator.

This type of forced air-cooled engine-driven generator has C.
It is necessary to blow cooling air to both the engine and the generator to cool them. Therefore, in the past, it was necessary to install two fans, one for the engine and one for the generator, and a volute chamber was required for each fan.
In particular, hot air from the engine side is difficult to dispose of and easily leaks to the generator side, making it difficult to take measures against temperature rises in electrical parts of the generator.

Therefore, the fan and volute chambers are combined into one.
Utility Publication No. 51-50929, Utility Model Publication No. 56-117
The prior art described in Japanese Patent No. 026 is disclosed. However, these prior art technologies have a structure in which the generator, which is the load side, is cooled once and the heated cooling air is blown to the engine side, which is the driving side. Not suitable for cooling.

The object of the present invention has been made in view of these circumstances, and is to improve the cooling efficiency by sucking fresh air into both the engine and the generator using a fan and a volute chamber and cooling them individually. Score.

The present invention aims to provide an engine-driven generator which reduces the number of assemblies, and further prevents cooling exhaust air, especially hot I4 exhaust air from the engine side, from leaking to the generator side.

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

1 to 12 show a practical example of the present invention; FIG. 1 is a longitudinal sectional view of the engine-driven generator of this embodiment; Figure 1 is a cutaway plan view of the soundproof case, Figure 4 is a sectional view taken along line A-A in Figure 1 with the generator and fan omitted, and Figure 5 is a cutaway of the soundproof cover in Figure 1. FIG. 6 is a partially cutaway front view showing a part of the muffler, FIG. 7 is a plan view of the muffler cover shown in FIG. 6 with the muffler cover cut away, and FIG.
8 line sectional view, Figure 9 is the C-C line sectional view of Figure 8,
The figure is an enlarged front view of the tip of the output shaft of the engine that connects the rotor drive shaft of the generator, Figure 11 is a front view showing the fan (also used as a flywheel) equipped with a magneto magnet and the ignition coil, and Figure 12 is a front view showing the ignition coil. D- in Figure 11
There is a cross-sectional view of DI.

In these figures, 1 is the anti-I case, 2 and 34
The strong air-cooled engine and generator housed and arranged in this soundproof case 1 constitute a direct-engine-connected type generator in which the rotor drive shaft 5 of the generator 3 is connected to the output of the engine 2 and the car 4. The above-mentioned output shaft 4 has a first tapered part 4a whose diameter increases toward the engine 2 side in the middle, and a second tapered part 4b which similarly expands its diameter toward the engine 2 at the tip. This first tapered portion 4a (a male tapered portion 4c is formed at the adjacent front side (on the side opposite to the engine) 8 and the first tapered portion 4
A and the second tapered portion 4b are configured such that their respective extension lines do not overlap the other tapered portion. These are the first and ninth second tapered portions 4a of the engine output shaft 4.

4b Ken 11! ! This was done to prevent the 111 parts from colliding with each other from time to time. A boss portion having a tapered bearing hole of a fan 6 that also serves as a fly hole is fitted into the first tapered portion 4a of the engine output shaft 4, and a key is inserted thereinto, and the key is inserted into the first tapered portion 4a of the fan 6. A nut 7 is screwed onto the male threaded portion 4c, and the nut 7 presses and presses the fan 6 in the diameter expanding direction I\ of the first tapered portion 4a and fixes it. The rotor drive shaft 5 of the fl distribution generator 3 is formed into a hollow shape that passes through the shaft in the axial direction, and the engine side end opening 58 is connected to the second tapered portion 4b of the engine output shaft 4. The tapered opening 5a is formed in a tapered shape that widens toward the end face so as to coincide with each other.The tapered opening 5a fits the second tapered portion 4b of the engine output shaft 4, and A slotted hole 4 (1) communicating with the hollow of the rotor drive shaft 5 is formed in the direction of the center axis of the portion 4b. I Torair a is screwed into the rotor drive shaft 5, and its tip is screwed into the threaded hole 4d of the second taper portion 4b of the engine output shaft 4 into which the taper opening D5a4 of the rotor drive shaft 5 is inserted. The engine output shaft 4 and the rotor drive shaft 5 are firmly connected by pulling the shaft toward the tapered opening 5a and inserting the parts into both cheeks.

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 1o is formed at a side where an inlet 9 for injecting engine oil is disposed, and at a position where the inlet 9 is exposed. Also, soundproof case 1 and ■,
Engine 2 crankcase 11. Oil pan8. The space between the cylinder 12° and the ignitor 3 is appropriately narrowed (cooling air passage 13). is arranged so as not to face the cold fill!l inlet 10 of the soundproof case 1, so that the sound of air intake 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 volute forming portion 16b in the middle and a stator attaching portion 16c at the tip. The polycoat formation portion 16b forms a polycoat 17 that surrounds the engine 2 and the generator 3111 and is separated from the cooling air passage 13, and
A fan 6 axially attached to the engine output shaft 4 is disposed at 7. On the other hand, the stator attachment 8Ii16c is attached to the generator 3 while holding the outer periphery of the engine side stator 18.

Further, the outer periphery of the silicator 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.

The engine cooling fJ]Ii1 passage 20 has an inlet 21 at its lower portion that communicates with the cooling air passage 13. on the other hand,
This engine cooling ventilation! ! 820 has an outlet 22 formed in the polycoat forming portion 16b of the bearing plate 16 to communicate with the polycoat 17.

A bearing plate 23 is disposed on the side of the generator 3 opposite to the engine and supports the rotor drive shaft 5 via a bearing, and the upper part of the bearing plate 23 extends toward the engine side 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 has an opening 24 for communicating the inside of the generator 3 with the cooling air passage 13 .

On the other hand, the engine side of the generator 3 opens into a chamber 17 and communicates with the volume i. Incidentally, near the inlet 24 of the bearing plate 23, electric parts 25 that do not tolerate high temperatures, such as semiconductors for controlling the generator, are disposed, and the cooling air flowing into the generator 3 from the cooling air passage 13 is It is supposed to be cooled down.

Further, an inlet 26a is provided on one side of the entire volute forming portion 16b of the bearing plate 16 forming the polycoat 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, an air exhaust port 17a is formed on both sides of the polycoat forming portion 16b, and an air exhaust duct 2 is formed on one side.
6 is connected to communicate with the outside via the air exhaust tact 26, and the air exhaust port on the other side is opened directly to the outside to open the soundproof cover 1.
In addition, in the case where openings (for ventilation ports) are formed on both sides of the polycoat forming part 16b and only copper is used for the ventilation duct 26, ．． t. The other opening is used by closing it with a shielding plate.

The fan 6, which is pivotally attached to the engine output shaft 2 and disposed within the polycoat v17, has a fan 6a on both sides.

It is formed in a both-side suction type with 6b,
5 is the cooling air introduced from the cooling air introduction port 10...
Cold section air passage 13-1 Engine cooling air passage 2o → Inlet 2
2 into the polycoat 17 to cool the engine 2 in particular.The other side cools the introduced cooling air from the cooling air passage 13 to the inlet 24-1 of the generator bearing plate 23 inside the generator 3 with a frog. The air is sucked into the polycoat 17 to ventilate the inside of the soundproof case 1 to prevent heat build-up, and to cool the electrical components 25 placed near the inlet 24 of the bearing plate 23 as described above. It is supposed to cool down.

The exhaust duct 26 is disposed in a relatively long shape in the case 1 extending from the side surface of the polycoat 17 to the side surface of the generator 3 on the side opposite to the engine. It is located. A longitudinal recess 28 is provided on the outer surface of the muffler body 27.
A plurality of convex portions 29, . 3o
...and a convex part 81131 is formed, and the muffler body 27 and the convex part 29.31 of the exhaust ducts 1 to 26 are joined together and fixed with a C screw or melted, and the muffler small f12 is formed.
7 is installed inside the exhaust tact 26. Then, the recess 28 of the mano body 27 and the recess 130 of the exhaust tough 1-26.
A muffler tail via 32 in the longitudinal direction is formed vertically by the muffler body 2.
A muffler cooling air passage 33 is formed on the outer periphery of the muffler cooling air passage 33, and this muffler cooling MIM passage 33 and both ends of the muffler tail vibe 32 are communicated with each other. Also, on the opposite end of the outer surface of the exhaust tact 26, 1. An air exhaust port 34 is formed and communicates with an exhaust port 35 formed in the soundproof booth No. 1 and open to the outside. On the other hand, muffler body 2
7, a first expansion chamber 37 is formed in the inner part and a second expansion chamber 38 is formed in the outer part by a partition wall 36 stretched in the longitudinal direction of the interior, and both chambers are partitioned! ! Numerous communicating holes 39 drilled in 36
It is connected by...

In addition, each recess 28 of the muffler hotty 27 has a
A plurality of communicating small holes 40... are bored, and are connected to the second expansion chamber 38? ! It communicates with the number 77 Ratail Vibe 32... Further, an exhaust pipe 41 is inserted into the first expansion chamber 37 (on the engine side).

The ignition coil 42 is disposed in the cooling air passage 13 located above the holute chamber forming portion 16b of the bearing plate 16, and only the iron core 43 is connected to the
- From the mounting hole drilled in the forming part 16b to the volute chamber 1
7 so that the flow of cooling air within the volume chamber 17 is not obstructed by the ignition coil 42. Furthermore, this ignition coil 42
Since it is located away from the hot and humid parts 'a' of the cylinder 12, etc., and in 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 Irll1 steel plates 44 are arranged in layers in one of the recesses,
In the other concave portion, a balanced magnetic steel plate 45 is arranged in layers.

In addition, the reference numeral 46 in the figure is a beam coil scooter, and 47 is 11! The shrine tank, 48 is a rotor, and 49 is a leg piece.

In such a configuration, when the -Noan 6 is rotated by the drive of the engine 2, the cooling air flows through the cooling air inlets 10 formed on the bottom and side surfaces of the soundproof case 1 into the booth 1. The cooling air flows into the cooling air passage 13 and hits the oil pan 8 to cool the oil pan 8, and a part of this inflow cooling air flows into the air intake port] 5tJ et al.
A part of the music is drawn into cylinder 1 by air guide plate 19.
The air flows into the engine cooling air passage 20 formed around the outer periphery of the air, cools the syringe 12, and is sucked into the small chute chamber 17 through the outlet 22. In addition, the cooling air bulge IJ and the cooling air passage 13 are circulated to the side opposite to the engine of the generator 3 for ventilation, and a part of the cooling air is used to cool the ignition D-(lecture 42 and the electrical parts 25). It flows into the generator 3 through the inlet 24 formed on the side opposite to the engine, cools the generator 3, and then is sucked into the volute 17. In this way, since the engine 6 is of the both-side suction type, Cooling air is sucked into the volutes 17 from both sides of the encilla 2 side and the generator 3IllI, and the e
- It is designed to cool the folded part and ventilate the inside of the eye protection case 1.

On the other hand, the cooling exhaust air that has flowed into the polygon 1-1 to 17 flows through the exhaust port 17a of the holute formation portion 16b and the inlet 26afl of the exhaust tact 26! A part of the air flows through the muffler cooling air passage 33 on the outer periphery of the exhaust duct 26 and reaches the exhaust port 34 on the side opposite to the engine of the exhaust duct 26 to cool the air exhaust duct 27. At the same time, the remainder flows into the engine side of the muffler tail vibe 32..., mixes with engine exhaust residue in the muffler tail vibe 32..., and flows into the exhaust port 34 of the exhaust tact 26 on the side opposite to the engine. Then, it is mixed with the cooling exhaust air that has passed through the muffler cooling air passage 33 inside the exhaust port 34 and is discharged to the outside. Here, cooling exhaust air (j, discharged into the muffler tail vibe 32...
The muffler tail vibe 32
The ejector effect of the engine exhaust gas is sucked into the exhaust air duct 26 and discharged to the outside from the exhaust port 34 of the exhaust duct 26. As a result, cooling exhaust air is efficiently discharged.

In addition, the engine exhaust gas discharged from the 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 hole 39 of the partition plate 36.
..., flows into the second expansion chamber 38, where it is expanded and decompressed again, passes through the small communication hole 40, and is discharged into the muffler tail vibe 32. Since the vibrator 32 is formed inside the protective case 1, the discharge sound is reduced and discharged to the outside. Furthermore, the muffler body 27 has a muffler cooling air passage 3.
3, and the exhaust gas itself is mixed with the cooling exhaust air inside the muffler tail pipe 32 and at the exhaust port 34, so that the engine exhaust gas is reduced in temperature and contamination to the outside. is discharged.

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 the E of FIG.
-E line sectional view. The fan 50 which also serves as a flywheel in this embodiment is formed in a monotonous type and a double-sided suction 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 behind the bearing boss 53 and the above-mentioned 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. The functions of the fan 50 of this embodiment and the fan 6 of the first embodiment are the same.

[In the embodiment described above, the cooling air inlet 10 is opened near the oil pan facing position on the bottom surface of the soundproof case 1 and on the side surface, for example, near the oil inlet, but this cooling air inlet 10]
8, the inlet 10 may be provided only on the bottom surface of the soundproof case 1, and may also be provided near the generator 3.

As described above, according to the present invention, fresh air can be sucked into both the engine and the generator and cooled individually using - fans and volutes to improve cooling efficiency, and two parts are included. In addition, cooling exhaust air,
In particular, this has the effect of preventing hot air exhaust from the engine side from leaking to the generator side.

[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 cross-section of the soundproof cover shown in Fig. 1 with a cutout. Fig. 6 is a front view with the muffler cover cut out, Fig. 7 is a plan view with the muffler cover cut out, Fig. 8 is a sectional view taken along line B-Bm in Fig. 7, and Fig. 9 is a front view with the muffler cover cut out. Figure 10 is an enlarged front view of the tip of the output shaft of the engine that connects the D-drive shaft of the generator, and Figure 11 is a fan (also used as a flywheel) equipped with a magneto magnet. 12 is a sectional view taken along line D-D in FIG. 11, FIG. 13 and 1
Figure 4 shows a second embodiment of the fan, Figure 13 is a rear view,
FIG. 14 is a 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, 16...
・Bearing plate, 17... Volute chamber, 2o... Engine cooling air passage, 21... Inlet, 22... Outlet, 24... Inlet, 26... Exhaust duct, 27
...Exhaust port. 93 Figure 8 2737 Figure 9 Figure 10

Claims (1)

[Claims] A forced air cooling engine and a generator are arranged in a soundproof case, the output shaft of the engine is directly connected to the drive shaft of the generator, a fan is attached to the directly connected shaft for the engine and the generator, and the fan is used to connect the engine to the generator. and a generator, configured to suck in cooling air from both sides of the 9 side and discharge it outside the soundproof case, wherein a bearing plate of the engine is extended toward the generator side to form a volute chamber in which the fan is housed; An engine-driven generator characterized in that a stator of the generator is supported at the tip of the bearing plate extension.