JPH0529771B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a portable engine generator configured by integrally combining an engine and a generator driven by the engine and housing the same in a soundproof case. In particular, the present invention relates to an arrangement structure including a structure of a soundproof case for a portable engine generator.

(Prior Art) Portable engine generators are mainly used for leisure activities and outdoor work. In this case, since the operating noise of the engine-generator unit, which includes the engine and generator, is relatively loud, depending on the intended use or usage environment, the unit may be housed in a soundproof case to reduce operating noise. There is.

This type of portable engine operating device having a relatively small soundproof case is disclosed in, for example, Japanese Patent Application Laid-Open No. 59-170596.
No. 59-17097. In these devices, an engine and a working machine are assembled to a metal base to form a unit, and this base is used as a bottom plate or bottom cover of a soundproof case. That is, a soundproof case was created by combining a base on which the unit was assembled with a cover that covered the front and rear parts of the unit.

In addition, as other prior art, Utility Model Application No. 53-3302
It is known that the soundproof case is divided into three parts in the longitudinal direction, and the engine working machine body is supported by a central frame shaped like a hollow.

(Problem to be Solved by the Invention) However, in the former case, the soundproof case consists of at least three parts: a bottom cover, a front cover, and a rear cover, and the complexity is such that each cover needs to be constructed separately. This made the overall structure of the soundproof case complicated and required a large number of steps to assemble the unit.

In the latter case, with such a structure, it takes a lot of effort to attach and fix the engine working machine body, and the central frame (main frame 1) has mounting parts for attaching each piece of equipment.
The structure becomes more complex.

Therefore, it is an object of the present invention to provide a portable engine generator in which the structure of the soundproof case is simplified, the number of assembly steps is reduced, and the main unit consisting of the engine, working equipment, etc. can be easily attached and fixed. With the goal.

(Means for solving the problem) In order to achieve this object, the present invention provides an engine 1
01, a generator 200 driven by the engine 101, and a soundproof case 300 that supports and houses a main unit including the engine 101 and the generator 200. and the generator 200
means the output shaft of the engine 101 and the generator 2.
00 are aligned on a common axis in the vertical direction, and the soundproof case 300 is formed in a shape extending along the extending direction of the cylinder block 103 of the engine 101. The cylindrical main covers 301 and 302 that integrally support and house the main unit, and the two lid-like end covers 310 and 330 that close the opening ends of the cylindrical main covers 301 and 302 can be separated from each other. The cylinder block 103 of the engine 101 extends from the lid-shaped end covers 310 and 330.
A muffler housing portion for the engine was formed on the other side, and a mounting portion for electrical components was formed on the other side.

Further, an outer rotor type generator 200 is arranged below the engine 101.

(Example) Examples of the present invention will be described below with reference to the accompanying drawings. Note that the same reference numerals in each figure indicate similar objects.

FIG. 1 shows a portable engine generator according to an embodiment of the invention. According to the figure, the portable engine generator according to the embodiment of the present invention mainly consists of an engine unit 100, a generator unit 200, and a case 300.

The engine unit 100 includes a crankcase 1
02, cylinder block 103, crankshaft 104 extending from crankshaft 102,
An engine body 1 consisting of a spark plug 105 and a spark plug 105
01, the fuel tank 110 and air cleaner unit 120 are located on the left side, the muffler unit 130 is located on the right side, and the recoil starter unit 140 is located on the upper side of the crankcase.
It is equipped with The engine body 101 has a crankcase 102 and a cylinder block 103 aligned in the lateral direction so that the crankshaft 104, which is the output shaft of the engine, is oriented vertically. Therefore, combustion of fuel within cylinder block 103 causes a piston (not shown) to reciprocate laterally, causing crankshaft 104 to rotate. The fuel tank 110 is a single component manufactured by molding synthetic resin or the like. This fuel tank 110
The flange-shaped portion 112 of the fuel inlet 111 is fitted into the case 300 side and supported on the case 300 side. A cap 114 is provided on a portion 113 of the injection port 111 that projects upward from the case 300, and by removing this cap 114, fuel can be injected. The cleaner unit 120 is connected to the case 300 as shown in FIG. 2a.
It includes a cover plate 121 for fixing the entire unit to the side, a cleaner element 122, and a cleaner case 123 attached to the manifold side for connecting to the crankcase 102 of the engine 101. Muffler unit 13
As shown in FIG. 2b, the engine 0 is equipped with a muffler 131, a manifold 132 that connects the engine exhaust port and the muffler 131, and the like.

A generator 200, which will be described later, is arranged below the engine body 101, and a crankshaft 104, which is an engine output shaft, is connected to a rotor rotation shaft 204, which is an input shaft of the generator 200. Further, a recoil starter 140 is arranged above the engine body 101, and this starter 14
The rotating shaft of No. 0 is also connected to the crankshaft 104 side. The recoil starter 140 is connected to the crankshaft 1 of the engine by pulling out the wound cord 141 from the case 143 using the knob 142.
04 to start the engine. After the cord 141 is pulled out, it is rewound to its original position by the action of a rewinding mechanism (not shown) such as a spring inside the case 143. Further, a mechanism (not shown) is provided for connection to the engine side so that it is disconnected after the engine is started.

By arranging each component as described above, the left side is the cold air side and the right side is the hot air side on the left and right sides near the plane passing through the rotation center axis A of the crankshaft 104 and perpendicular to the plane of the paper. More specifically, the generator unit 200 is made thinner, and passes through a common axis A in the vertical direction with the crankshaft 104 of the engine 101 and the rotor rotating shaft 201 of the generator 200, and the handle 320 of the soundproof case 300 (described later). 5
The first side (right side in Figure 1) of a virtual plane substantially orthogonal to the longitudinal direction of the figure is a high temperature system, and the second side (left side in Figure 1) is a low temperature system. This situation will become clearer in the explanations below.

As shown in FIGS. 1 and 3, the generator 200 includes a rotor rotating shaft 201 and a rotor plate 20.
2, field pole 203, cooling fan 204, partition plate 2
05, a bearing 210, and a stator winding 211. The rotor rotation shaft 201 is a cylindrical body having an axial through hole 201A.
Fit the engine crankshaft 104 into 1A and secure with bolts or the like. This rotor rotation shaft 201
A disc-shaped rotor plate 202 having a rising portion 202A with its central axis aligned is mounted around the rotor plate.
Rising portion 202 on the outer periphery of rotor plate 202
At A, field poles 203 made up of a predetermined number (for example, 24) of permanent magnets are arranged at regular intervals. Further, a cooling fan 204 is provided at the end of the rising portion 202A on the outer periphery of the rotor plate 202.
Deploy. The cooling fan 204 has a plurality of radial fans, and the radial center of the fan is made to coincide with the rotation center of the rotor rotation shaft 201. This cooling fan 204 is equipped with an orientation plate 205 that divides each fan in the vertical direction. This alignment plate 205 is attached through the slit 2 of the alignment plate 205.
This is done by inserting and engaging each fan of the cooling fan 204 into 05A. Therefore, the fan of the cooling fan 204 and the slit 205A of the orientation plate 205 are formed complementary to each other.

The stator winding 211 has a ball bearing 21
0 to the rotor rotating shaft 201. At this time, the stator winding 211 does not rotate,
For example, a stopper (not shown) for preventing rotation of the stator is provided on the fixed side of the crankshaft cover 106 fixed to the crankcase 102 so that only the rotor rotates. By arranging the armature winding 211 inside the rotor field poles, an outer rotor rotating field type synchronous generator can be configured. According to such a generator, since the armature winding can be extended and wound in the axial direction, the number of turns can be increased with a thin coil, and since the field poles are arranged around the rotor, The number of poles can be increased. Therefore, a thin generator with a large output voltage can be obtained. In addition, the field pole rotor, which is relatively heavy, acts as a flywheel for the engine, making it possible to obtain stable rotation and, in turn, stable output voltage. Note that the output voltage of the generator is rectified by a three-phase full-wave rectifier circuit, and then converted to an alternating current voltage of a predetermined frequency via a voltage stabilization circuit, an inverter, and the like. An electric circuit for obtaining such an alternating current of a predetermined frequency is also included in a part of the portable engine generator.

Furthermore, the cooling fan 204 includes a cooling fan 20
4, partition plates or guide bodies 220, 221, 222 are provided on the rising portion 202A of the rotor plate 202 and the shaft cover 106 in correspondence with the orientation plate 205. Such partition plates or guide bodies 220, 22
1, 222 is a partition member 230, 231 which will be described later.
At the same time, the cooling air is sent to the engine cylinder block 1.
It can be separated into the 03 side and the muffler 130 side. As can be seen from FIG. 4, the guide body 220 that sends the cooling air toward the cylinder block has a shape that moves upward in a spiral shape, thereby improving the ventilation efficiency.

FIG. 4 is an exploded view mainly showing the engine portion of the portable engine generator according to the embodiment of the present invention described above. This drawing also shows that the cylinder block 103 of the engine is connected to the partition members 230 and 2.
It can be seen that the exhaust muffler 130 is separated from the low temperature system at the lower part of the cylinder block 103 at 31 and is also separated from the low temperature system.

That is, according to the figure, it is arranged around the crankcase 102 and cylinder block 130 of the engine. Partition members 230, 231 are shown. These partition members 230 are composed of a portion 230A that forms a closed space surrounding the cylinder block 103, and a plate-shaped portion 230B that separates the muffler unit 130 from the engine side. The partition member 231 passes through the vicinity of the joint between the crankcase 102 and the cylinder block 103, and separates a low-temperature section and a high-temperature section of the engine. Furthermore, the partition member 231 has an L-shaped opening 231A and a linear opening 231B at the bottom of the opening 231A. The opening 231A forms a ventilation path for cooling the engine side, and the opening 231B forms a ventilation path for cooling the muffler 130 side. 231a, 231b, 231
c is a packing for fixing the partition member 231 within the case 300. Further, 40 is a carburetor provided between the air cleaner 120 and the manifold.

FIG. 5 shows the configuration of the case 300. According to the figure, the case 300 is connected to the engine unit 10.
The main cover has a substantially cylindrical shape extending along the extending direction of the cylinder block 103 of 0, and is made up of two extruded aluminum side plates 301 and 302, and 6 fixed to both ends of the side plates 301 and 302 Nylon resin end covers 310, 33
0, and a resin handle 330 that forms part of the main cover. Further, a muffler housing portion of the engine unit 100 is formed on the extending side of the cylinder block 103 of the engine unit 100, and a mounting portion for the electrical components is formed on the other side. Side plate 30
A holding rail 305 for integrally mounting the engine unit 100 and the generator unit 200 is formed inside the side plate 1,302 in the longitudinal direction of the side plate. Rails 306A, 306B are provided at the lower side ends of the side plates 301, 302, respectively, and one leg member 34 is provided at one end of these rails 306A, 306B.
1, the two side plates 301, 3
02 is fixed, and this and the side plate 30
Fitting groove 308A provided on the outer lower part of 1,302,
Two leg members 342A fitted into 308B,
342B constitute the legs of the device. Moreover, the upper edges 301A, 33 of the side plates 301, 302
2A by sliding the groove 320A formed within the thickness of the flat part of the handle 320.
The upper ends of the two side plates 301 and 302 are fixed. An opening for cooling air is formed in the switch recess 301B of the side plate 301. end cover 310
A cover plate 313 for replacing the plug 105 can be removably fitted and fixed therein. A guide means for the recoil starter 140 is formed on the handle 320. The end cover 330 is formed with a cooling air vent 331, an air cleaner opening 332, and an electrical component opening 333. The cooling air intake port 331 is formed at a position where the inflowing air collides with the fuel tank 110, and the air is diffused to various parts of the cabin to improve cooling efficiency.

By forming various openings for ventilation of cooling air in this manner, cooling air flows as shown by the arrows in FIG. Furthermore, the opening for cooling air ventilation that opens to the outside of the case 300 is located at the fuel tank 11.
0. Since the ventilation maze is formed by the partition members 230, 231, etc., it is possible to reduce the rate at which the operating noise of the engine or the like is lost to the outside. In particular, when the fuel tank 110 contains fuel, it acts as a heavy object, so that the soundproofing effect can be enhanced.

In addition, since the cooling air flows in one direction from the low-temperature system to the high-temperature system as described above, the cooling efficiency is good, and since the high-temperature system is mainly concentrated in the end cover 310, the heat generated after the engine stops is Diffusion is also facilitated. Furthermore, since the fuel system belongs to the low-temperature system, conditions can be established in which vapor lock is less likely to occur.

Further, since the engine cylinder block 103 and muffler 130 are located in the end cover 310 portion, maintenance and inspection such as plug replacement can be easily performed by attaching and detaching the end cover 310.
Moreover, especially immediately after the engine has stopped, maintenance and inspection work can be carried out while reminding people to pay attention to the concentration of high-temperature parts.Similarly, by attaching and detaching the end cover 330, maintenance and maintenance of the low-temperature system can be carried out. Can be easily performed.

Next, how the main units such as the engine 101 and the generator 200 are housed and supported in the soundproof case 300 as described above will be explained with reference to FIGS. 4, 6, and 7. First, since the engine 101 and the generator 200 are integrated by being fixed to the crankcase 102 of the engine of the generator 200, the crankcase 102 etc. has a cross-sectional shape complementary to the above-mentioned holding rail 305. Projection-like leg portions 71, 72, 73, and 74 are formed in advance. That is, the holding rails 305 are formed inside the side plates 301 and 302 that constitute the main cover. The holding rails 305 extend in the axial direction of the cylindrical main cover and are substantially parallel to each other. Further, the cross section of this holding rail 305 has a substantially channel shape. Since both ends of this holding rail 305 are open, after the protruding legs 71, 72, 73, 74 of the main unit mentioned above are engaged with one end of this rail 305, the rail 305 is opened.
5, the main unit is housed in a predetermined position with the lower tip portion of the main unit being brought into contact with the abutting members provided on the main cover and the end cover 330.
At this time, cap-shaped vibration-proofing rubbers 61, 62 are fitted into the legs 71, 72, 73, 74, and these vibration-proofing rubbers 61, 62 are held between the holding rails 305.

Thus, the rotation of the engine causes the generator 200 to
The reaction force generated on the side can be absorbed by the case via the vibration isolating rubber. Additionally, the space at the bottom of the cylinder block is used to store the maura, and the space on the opposite side of the cylinder block extension is used to store electrical components, making it possible to downsize the soundproof case. .

The present invention is not limited to the above embodiments and modifications, but within the technical scope of the present invention,
Various other embodiments and variations are possible;
Also, the fact that equivalent components can be exchanged means that
It will be clear to those skilled in the art. For example, in this embodiment, a generator is used, but other working equipment may be used.

(Effects of the Invention) The present invention has a shape in which the output shaft of the engine and the input shaft of the generator are aligned on a common axis in the vertical direction, and the soundproof case is shaped to extend along the extending direction of the cylinder block of the engine. In addition, it has a three-part structure with a cylindrical main cover and two lid-shaped end covers that close both ends of the main cover's opening, which can be separated from each other, and the engine and generator are supported within this main cover. At the same time, the cylinder block side of the end cover is used as the engine muffler storage area,
The other side was used as an electrical equipment storage area, and the generator was placed below the engine, and the engine and generator had a coaxial structure with their rotational axes, so that an outer rotor type generator was used.

With this configuration, it is not only possible to perform maintenance and inspection around the engine or generator from the side simply by removing the end cover, but also because the muffler and electrical components can be stored in each end cover. With the cover removed, parts of the main unit exposed from the main cover, such as the engine muffler, or electrical components, can be easily maintained and inspected.

In addition, since the muffler is housed in the end cover on the cylinder block side of the engine, by removing this end cover, maintenance and inspection work can be carried out while calling attention to the concentration of high-temperature parts, especially immediately after the engine has stopped. be able to.

Furthermore, by using an outer rotor type generator, the rotor diameter can be made larger than that of an inner rotor type, and therefore the inertia can be increased.Furthermore, since the generator is placed below the engine, the rotation can be stabilized by the gyro effect. can be achieved.

Furthermore, according to the present invention, for example, by arranging a strength member in the central main cover, the end covers on both sides can be made of lightweight members such as resin as in the embodiment, and the weight of the device can be reduced. can be achieved.

Further, as shown in the embodiment, parts that require frequent maintenance such as a muffler, cylinder, and plug can be covered with one cover, thereby improving maintainability.

Furthermore, according to this embodiment, the following effects are achieved.

(1) The engine and work equipment are arranged so that the engine output shaft and the work equipment input shaft are aligned on a common axis in the vertical direction, and the main unit is arranged in a plane substantially orthogonal to this common axis via vibration isolating means. By supporting the engine in a soundproof case, it is possible to obtain a portable engine generator that is small and lightweight, and the operating sound of the engine can be sufficiently attenuated by the soundproof cover, and has low noise.

(2) When the working machine is an outer rotor type generator, the circumferential speed of the rotor can be increased, and even at the same rotation speed, a larger output can be obtained than an inner rotor type generator. Therefore, the radius can be increased and the height can be decreased. Furthermore,
In this case, the rotor can be expected to function as a flywheel.

(3) Furthermore, if a large-diameter outer rotor type generator is placed below the engine, stabilization of operation can be expected due to the so-called gyro effect. The above-mentioned method for setting the center of gravity also has a good effect on stable operation, so that, for example, natural movement of the device due to rotation of the engine is eliminated.

(4) By fixing the cooling fan using the outer circumference of the rotor, the space in the bearing area can be used effectively, contributing to miniaturization.

(5) From the above (1), sufficient output can be obtained even if the engine speed is lowered, which can contribute to reducing noise.

(6) Other features described elsewhere in the specification are:
This results from the basic configuration of the present invention as described above, and is an effect of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a side view of a portable engine generator according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of main parts of a portable engine generator according to an embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. FIG. 4 is an exploded explanatory diagram of still another essential part of the portable engine generator according to the embodiment of the present invention;
FIG. 5 is an exploded explanatory diagram of still another main part of the portable engine generator according to the embodiment of the present invention, and FIGS. 6 and 7 are main units of the portable engine generator according to the embodiment of the present invention. It is an explanatory view showing the relationship between and a soundproof case. In addition, 61 and 62 in the drawing are anti-vibration rubber, and 71 to 74
is the supported part of the main unit, 101 is the engine, 1
04 is the output shaft, 110 is the fuel tank, 200 is the generator, 300 is the soundproof case, 301, 302 are the main cover side plates, 305 is the holding rail, 310, 33
0 is an end cover, and 320 is a handle forming a part of the main cover.

Claims (1)

[Scope of Claims] 1. A portable engine generator comprising an engine, a generator driven by the engine, and a soundproof case that supports and houses a main unit including the engine and the generator, comprising: The engine and the generator are arranged such that the output shaft of the engine and the input shaft of the generator are aligned on a common axis in the vertical direction, and the soundproof case is arranged along the extending direction of the cylinder block of the engine. A cylindrical main cover that has an elongated shape and integrally supports and houses the main unit inside the cylindrical main cover, and two lid-shaped end covers that close both ends of the opening of this cylindrical main cover are mutually connected. The lid-shaped end cover has a three-part structure that can be separated, and furthermore, a muffler storage portion for the engine is provided on the side where the cylinder block of the engine extends from the lid-like end cover, and a mounting portion for electrical components is provided on the other side. A portable engine generator characterized by the following: 2. In the device according to claim 1,
A portable engine generator characterized in that an outer rotor type generator is arranged below the engine.