JP5066602B2 - Portable engine generator - Google Patents

Description

  The present invention relates to a portable engine generator driven by an engine.

A portable engine generator is a generator designed to be carried by people. Portable engine generators have a variety of uses.
Applications for business use include power supplies for civil engineering and construction sites, power supplies for power tools, power supplies for relatively large and medium-scale outdoor events such as outdoor concerts and festivals, and emergency emergency power supplies. .
For personal use, for example, a power source for simple work at home, a power source for charging a battery of an automobile, a power source for a relatively small outdoor event such as camping, a power source for night fishing, etc. is there.
The required output varies depending on the application, and the output of a portable engine for business use is generally larger than that of a personal portable engine. The larger the output, the greater the weight, so a commercial portable engine is generally heavier than a personal portable engine.
The rated output of a commercial portable engine generator is, for example, 2000 VA or more (50 Hz / 60 Hz), and its weight is, for example, 25 kg or more. There are also generators over 30 kg. It is difficult to carry such a portable engine generator alone.
On the other hand, the rated output of a personal portable engine generator is, for example, less than 2000 VA, and its weight is, for example, less than 25 kg. There are also generators of 20 kg or less and generators of more than 10 kg. A portable engine generator with such a weight can be carried by one person.
As described above, in a portable engine generator, generally, the weight (output) varies depending on the application. And the number and position of a handle differ with weight.
First, a relatively heavy portable generator (for example, a portable engine generator for business use) will be described.
Examples of the relatively heavy portable engine generator include a pipe generator in which four sides of the generator are surrounded by a pipe frame. For example, Patent Literature 1 is a literature relating to a pipe-type generator.
In the pipe-type generator shown in Patent Document 1, the upper pipe 45 is provided along the left and right sides in the short direction of the upper surface of the pipe-type generator (see FIG. 2 of Patent Document 1). The left and right upper pipes 45 serve as a handle. One upper pipe 45 is held by one or more people, and the other upper pipe 45 is also held by one or more people. Thereby, this pipe type generator is carried. Thus, pipe generators are usually carried by at least two people.
A relatively strong person can carry the pipe generator alone by holding the upper pipe 45 with both hands. If you do so, a pipe-type generator is located in front of you. Therefore, holding a pipe generator in an upright position makes it difficult to walk because the pipe generator contacts the thighs and knees. On the other hand, when the pipe-type generator is held in a forward-bent posture, it is possible to prevent contact between the knees and shins and the pipe-type generator. However, since it places a burden on the waist, it is difficult to carry over long distances.
As described above, the pipe-type generator is not designed for carrying by one person, and is designed for carrying by a plurality of persons. Therefore, the pipe-type generator is not suitable for carrying by one person.
Further, in a portable engine generator having a relatively heavy weight, not limited to a pipe generator, a plurality of handles are arranged along the side of the upper surface of the main body. These portable engine generators are also suitable for carrying by multiple people, just like pipe generators.
Next, a portable generator having a relatively small weight (for example, a personal portable engine generator) will be described.
Portable engine generators that are relatively light in weight include covered generators and open generators. In the covered generator, the entire device is covered with a cover, so that the sound deadening property is excellent, but the device becomes large. In an open type generator, there is no cover that covers the entire device, so that it is possible to reduce the size relatively.
As an open-type generator, for example, a die-cast generator including a die-casting frame in which a part of components of the generator main body and the engine main body and a side wall 76 of the portable generator 71 are integrally formed as shown in FIG. There is. In this die cast generator, one handle 72 is disposed at the central portion of the upper surface of the main body so as to be along the longitudinal direction of the upper surface of the main body. Such an arrangement of the handle 72 is suitable for carrying by one person.
Moreover, the pipe type generator mentioned above is also an open type generator like a die-cast type.
However, in the case of a die cast generator, a part of the component parts and the side wall can be integrally formed, so that the number of parts can be reduced as compared with the pipe generator. In addition, it is easier to assemble because it has fewer parts than a pipe-type generator. Further, in the die-cast generator, no pipe is arranged around the main body. Therefore, the die cast generator is smaller than the pipe generator and is suitable for carrying.
In the above-described example, the portable engine generator is roughly classified into a business-use portable engine generator having a relatively large weight and a personal portable engine generator having a relatively small weight. . In practice, however, it is difficult to distinguish between the two. A commercial portable engine generator can be used for personal use, and a personal portable engine generator can also be used for commercial use.
However, the portable engine generator can be classified into a single-person portable engine generator and a multi-person portable engine generator depending on the arrangement of the handles. The single-person portable engine generator here means a portable engine generator suitable for carrying by one person, and does not mean that only one person can carry it. The multi-person portable engine generator means a portable engine generator suitable for carrying by a plurality of people, and does not mean that it can only be carried by a plurality of people.

In the case of the technology described in Patent Document 2, the die casting frame in which the component parts of the generator body and the side wall are integrally formed is adopted, so that the protruding amount of the pipe can be eliminated. The length in the width direction can be made shorter than that of the pipe generator. Moreover, since the handle for carrying the portable engine generator is attached to the center of the fuel tank provided at the upper part, it can be easily carried by one person.

2002-54453 Japanese Patent No. 3194565

As described above, the arrangement of the handle in the single-person portable engine generator is suitable for carrying by one person. In this respect, the single-person portable engine generator is clearly a multi-person portable engine generator. Is different. Also, single-person portable engine generators are generally lighter than multi-person portable engine generators. However, a single-person portable engine generator still has a weight of at least 10 kg. Some single-person portable engine generators exceed 20 kg. Therefore, a one-person portable engine generator does not feel light when carried by one person. Therefore, considering the ease of carrying by one person, the conventional portable engine generator still has room for improvement.
Furthermore, in the technique described in Patent Document 2 and the portable engine generator 71 shown in FIG. 10, the reinforcing material 74 must be attached to the upper surface of the fuel tank 73 so that it can withstand the force concentrated on the handle 72 when being carried. Don't be. Further, the side wall portion 76a immediately below the flange 75 connected to the fuel tank 73 is sufficiently thick to withstand the force concentrated when the portable engine generator 71 is lifted. Further, in order to fasten the handle 72 and the fuel tank 73 and fasten the fuel tank 73 and the side wall 76, it is necessary to tighten three bolts on one side surface.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a portable engine generator that is a die-cast generator and is lightened to be easily carried.

In order to achieve the above object, the present invention has the following configuration.
That is, the portable engine generator according to the present invention is a portable engine generator provided with an operation panel on the front surface, the engine, a generator that generates electricity by rotational driving of the engine, and the operation panel. Each of the sidewalls disposed on both sides of the operation panel above the fuel tank, and a side wall disposed on each side of the fuel tank, a fuel tank having a flange on a side surface thereof in contact with an upper surface of the sidewall, A handle that spans the upper surface of the side wall and the upper surface of the other side wall, wherein the side wall includes a first fastening portion that fastens the side wall and the flange at a front end portion of the side wall, and an end portion of the handle a second fastening portion for fastening the end portion and the flange and the sidewalls of the handle so as to be in contact with the flange together, formed under the sidewall, the ene A case portion that covers a part of either the generator or the generator, a straight front leg portion formed downward from the first fastening portion, and a rear leg portion formed behind the case portion. A portable engine generator.

  According to the present invention, the portable engine generator includes an engine, and the generator generates electricity by rotational driving of the engine. An operation panel is provided on the front surface, and side walls are disposed on both sides of the operation panel. The fuel tank has a flange on its side surface, and the flange and the upper surface of the side wall are in contact with each other. Above the fuel tank, a handle spans the upper surface of one side wall and the upper surface of the other side wall. The side wall has a first fastening part, a second fastening part, a case part, a front leg part, and a rear leg part. In the first fastening portion, the side wall and the flange are fastened at the front end portion of the side wall. In the second fastening portion, the end portion of the handle, the flange, and the side wall are fastened together. The case part covers one part of either the engine or the generator, and is formed in the lower part of the side wall. The front leg portion is linearly formed downward from the first fastening portion. The rear leg portion is formed behind the case portion.

  Rather than attaching the handle to the upper surface of the fuel tank, fastening the handle, the fuel tank, and the side wall together eliminates the need for a fuel tank reinforcing material, making it possible to reduce the weight of the portable engine generator than before. . Moreover, a set of fastening members can be reduced by fastening the handle, the fuel tank, and the side wall together rather than fastening the handle, the side wall, and the fuel tank, and the side wall individually. By reducing the number of fastening members, the portable engine generator can be reduced in weight. As a result, the ease of carrying by one person can be improved.

  The front leg portion formed in a straight line functions as one rigid body and absorbs an impact when the portable engine generator is lowered to the ground. Since the front leg functions as a single rigid body, the structural strength of the side wall is increased.

  In the above-described invention, it is preferable that the front leg portion has a column shape centered on a vertical axis passing through the first fastening portion. According to this, the strength of the front leg portion can be increased because the front leg portion has the columnar shape around the vertical axis passing through the first fastening portion. Moreover, the front leg part arrange | positioned at the front-end part of a side wall is formed in columnar shape, The intensity | strength of the front corner of a portable engine generator can be raised.

  In the above-described invention, a recess is formed in the side surface of the front leg portion, and the recess preferably has a linear shape parallel to the longitudinal direction of the front leg portion. According to this, the side wall can be reduced in weight while maintaining the strength.

  In the above-described invention, the side wall is formed with a shaft part with a side wall surface bulging from the second fastening part to the case part, and the shaft part has a linear shape parallel to the front leg part. Is preferred. According to this, the side wall has a front leg portion and a shaft portion whose side wall surface bulges. Since the strength of the side wall is maintained by the front leg portion, the shaft portion, and the case portion, the thickness of the side wall other than the front leg portion, the shaft portion, and the case portion can be reduced, and the weight can be reduced as a whole.

  In the above-described invention, it is preferable that the shaft portion has a semi-columnar shape centering on a vertical axis passing through the second fastening portion. According to this, since the shaft portion has a semi-pillar shape with the longitudinal axis passing through the second fastening portion as the center, the strength can be increased.

  In the above-described invention, it is preferable that a recess is formed on the side surface of the shaft portion, and the recess has a linear shape parallel to the longitudinal direction of the shaft portion. According to this, the side wall can be reduced in weight while maintaining the strength of the side wall.

  In the above-described invention, it is preferable that at least half of the height of the fuel tank is lower than the upper surface of the side wall. According to this, since the exposed portion of the fuel tank can be reduced as compared with the conventional case, the height of the portion protruding above the side wall upper surface of the portable engine generator can be kept low.

  In the above-described invention, a cock for adjusting the amount of fuel supplied from the fuel tank to the engine is provided, and a window is provided on one of the side walls between the front leg portion and the shaft portion. It is preferable that the cock is operably disposed. According to this, a side wall is reduced in weight by forming a window in a side wall. Furthermore, since the cock can be operated through the window, the convenience of the operation for adjusting the fuel amount is improved.

  In the above-described invention, it is preferable that the central axis of the shaft portion is disposed behind the axial center of the crankshaft of the engine and ahead of the rear leg portion. According to this, since the central axis of the shaft portion is arranged in front of the rear leg portion, the space above the rear leg portion can be used effectively, and the width of the engine generator can be reduced.

  Rather than attaching the handle to the upper surface of the fuel tank, fastening the handle, the fuel tank, and the side wall together eliminates the need for a fuel tank reinforcing material, making it possible to reduce the weight of the portable engine generator than before. . Moreover, a set of fastening members can be reduced by fastening the handle, the fuel tank, and the side wall together rather than fastening the handle and the fuel tank individually to the side wall. By reducing the number of fastening members, the portable engine generator can be reduced in weight.

  Further, the front leg portion formed in a straight line functions as one rigid body and absorbs an impact when the portable engine generator is lowered to the ground. Since the front leg functions as a single rigid body, the structural strength of the side wall can be increased.

It is a front view of the portable engine generator which concerns on an Example. It is a top view of the portable engine generator which concerns on an Example. It is a figure of the arrow A direction of FIG. It is a figure of the arrow B direction of FIG. It is a front layout figure of the portable engine generator which removed the operation panel which concerns on an Example. It is a figure of arrow A direction in FIG. 1 of the side wall of the portable engine generator which concerns on an Example. It is a figure of arrow B direction in FIG. 1 of the side wall of the portable engine generator which concerns on an Example. It is sectional drawing of the fuel tank of the portable engine generator which concerns on an Example. (A) is a side view schematically showing a portable engine generator in which a flange is disposed at a relatively high position, and (b) is a portable engine generator in which a flange is disposed at a relatively low position. It is a side view which shows typically. It is a side view of the portable engine generator which concerns on a prior art example.

Embodiments of the present invention will be described below with reference to the drawings.
In the following description, front and rear and left and right and up and down are based on a case where the operation panel of the portable engine generator is viewed from the front.

1. 1 is a front view showing a schematic configuration of a portable engine generator according to the present embodiment. 2 is a plan view of the portable engine generator, FIG. 3 is a view in the direction of arrow A in FIG. 1, and FIG. 4 is a view in the direction of arrow B in FIG.

  The portable engine generator 1 according to the present embodiment has an engine 2 arranged in the right half and a generator 3 arranged in the left half when viewed from the front. An operation panel 4 is disposed in front of the engine generator 1. The operation panel 4 has a rectangular shape in front view. The right side wall 5 and the left side wall 6 are arranged opposite to each other with the operation panel 4 interposed therebetween. The left and right sides of the operation panel 4 and the front sides of the right side wall 5 and the left side wall 6 are adjacent to each other. A fuel tank 7 having a flange 7 a is placed on the upper surfaces of the right side wall 5 and the left side wall 6. A handle 9 is mounted on the right side wall 5 and the left side wall 6 via a flange 7a so as to extend over the fuel tank 7. In the present embodiment, the flange 7a has a horizontal flange surface. That is, the flange surface of the flange 7a is located on one horizontal plane (virtual plane). As shown in FIG. 2, the flange 7 a has an annular shape (rectangular annular shape) along the entire outer periphery of the fuel tank 7 in plan view. A tank cap 10 is provided on the upper surface of the fuel tank 7 in front of the handle 9. The handle 9 corresponds to the handle in the present invention. As shown in FIG. 2, in a plan view, the upper handle portion 9 a and the tank cap 10 are positioned differently in the front-rear direction, so that a space for gripping the handle 9 is secured and the handle 9 protrudes upward. Can be suppressed.

  Further, a fan cover 11 is attached to the side end of the portable engine generator 1 on the engine 2 side. From the fan cover 11, a handle 12 of a recoil starter for starting the engine is exposed.

  An engine switch 15, a DC12V outlet 16, and AC220V outlets 17 and 18 are attached to the operation panel 4 from the right. A resin cover 19 is attached to the right side wall 5 and the left side wall 6 between the operation panel 4 and the flange 7a.

  A muffler cover 21 is disposed on the back side of the portable engine generator 1, and an exhaust muffler is disposed therein. An air cleaner 22 is disposed at the end of the muffler cover 21 on the engine 2 side.

  Reference is now also made to FIG. FIG. 5 is a front view of the portable engine generator with the operation panel 4 and the resin cover 19 removed. The engine 2 is covered with an engine cover 2 a and an engine cover 32. The engine cover 32 and the right side wall 5 are integrally formed. The engine cover 32 protrudes from the right side wall 5. Inside the engine cover 2 a and the engine cover 32, a crankshaft 24 that is rotated by driving the engine 2 is housed. That is, the engine 2 includes a crankshaft 24. The cylinders of the engine 2 are disposed obliquely in the front-rear direction, and the engine cover 2 a and the engine cover 32 are disposed inclined from the lower part of the operation panel 4 to the back side of the fuel tank 7.

  The generator 3 is covered with a generator cover 3 a and a generator cover 52. The generator cover 52 and the left side wall 6 are integrally formed. The generator cover 3 a protrudes from the left side wall 6. The generator 3 includes a rotor shaft 25 connected to the crankshaft 24, a rotor 26 that rotates together with the rotor shaft 25, and a stator 27 provided around the rotating rotor 26. The crankshaft 24 is rotated by driving the engine 2. The rotor shaft 25 of the generator 3 rotates together with the crankshaft 24, and the rotor 26 attached to the rotor shaft 25 rotates in a stator 27, so that electricity can be generated to generate electricity.

  Next, refer also to FIG. FIG. 8 is a cross-sectional view of the fuel tank 7. As shown in FIGS. 5 and 8, the fuel tank 7 includes an upper half 7b having a flange 7d and a lower half 7c having a flange 7e. By combining the flange 7d of the upper half 7b and the flange 7e of the lower half 7c, the flange 7a is formed on the side peripheral surface of the fuel tank 7. The contact surface (flange surface) between the flange 7d of the upper half 7b and the flange 7e of the lower half 7c is located on one plane (virtual plane). The height h1 of the upper half 7b is shorter than the height h2 of the lower half 7c. Here, the height h2 indicates the distance in the vertical direction from the flange surface of the flange 7a to the bottom surface of the lower half 7c. When there are a plurality of planes as the bottom surface, the vertical distance from the flange surface of the flange 7a to the bottom surface of the lower half 7c is determined using a plane having a large area. Each of the flange 7d and the flange 7e has a plurality of holes. When the fuel tank 7 is configured by combining the flange 7d and the flange 7e, four bolt holes are configured in the flange 7a. By fixing the flange 7 a to the upper surfaces of the right side wall 5 and the left side wall 6, the fuel tank 7 is arranged so that half or more of the height is lower than the upper surfaces of the right side wall 5 and the left side wall 6. Thereby, since the exposed part of the fuel tank 7 can be reduced as compared with the prior art, the protrusion of the upper part of the portable engine generator 1 can be suppressed lower than the upper surfaces of the right side wall 5 and the left side wall 6.

2. Handle of Portable Engine Generator The handle 9 of the portable engine generator has an upper handle portion 9a that is gripped during carrying, and a side handle portion 9b in which an end portion of the upper handle portion 9a is bent downward. The upper handle 9a and the side handle 9b are integrally formed. The upper handle portion 9a is disposed across the upper side of the fuel tank. A depression is formed in a part of the side surface of the side handle portion 9b. The side handle portion 9b is connected to the flange 7a and the upper surfaces of both side walls by bolts 47 and 59 in the recess. Since the upper handle portion 9a is formed so as to surround the upper side of the fuel tank 7, the upper handle portion 9a has a function of protecting the fuel tank 1 when a rod or plate-shaped object falls on the portable engine generator 1.

3. Right side wall of portable engine generator A configuration of the right side wall 5 will be described with reference to FIGS. 3 and 6. 6 is a view of the right side wall 5 in the direction of arrow A in FIG.

  The right side wall 5 includes a front leg part 31, an engine cover 32, a side wall part 33, a rear leg part 34, a side wall part 35 and a shaft part 45. The front leg part 31, the engine cover 32, the side wall part 33, the rear leg part 34, the side wall part 35, and the shaft part 45 are integrally formed by die casting.

A bolt hole 41 is formed in the upper portion of the front leg portion 31 formed at the front end portion of the right side wall 5. The flange 7 a of the fuel tank 7 and the front leg portion 31 of the right side wall 5 are fastened by bolts 42. The bolt hole 41 and the bolt 42 correspond to the first fastening portion in the present invention. That is, the fuel tank 7 and the right side wall 5 are fixed on the upper surface of the front leg portion 31 that is the front end portion of the right side wall 5. A cylindrical front leg portion 31 is formed linearly from the fixed position to the floor surface with the longitudinal axis of the bolt 42 as the central axis. A rubber mount 31 a is attached to the lower end of the front leg portion 31.
The front surface of the front leg portion 31 is located in front of the front surface of the operation panel 4 (see FIG. 1). Accordingly, it is possible to reduce the possibility of an object coming into contact with the operation panel 4. As a result, it is possible to prevent the operation panel 4 from being damaged.

  The front leg portion 31 has a cylindrical shape. The front leg portion 31 is formed with a linear recess 31b. The recess 31b has a shape in which a part of the side surface of the front leg portion 31 is cut into a straight line. The recess 31 b is parallel to the longitudinal direction of the front leg portion 31. Thus, the front leg part 31 does not need to be a perfect cylinder, The shape by which a part of cylinder was shaved may be sufficient. The shape in which a part of the cylinder is cut can reduce the weight of the right side wall 5. The cylindrical shape in the present invention means that the portion corresponding to the exposed surface on the outer periphery of the cross section of the front leg portion 31 is an arc shape, and the center angle of the arc is 180 degrees or more. Moreover, the front leg part 31 arrange | positioned at the front-end part of the right side wall 5 is formed in a column shape, and the intensity | strength of the front corner of the portable engine generator 1 can be raised. Thereby, damage to the front corner of the portable engine generator 1 can be prevented. Moreover, the impact on the object colliding with the front corner of the portable engine generator 1 can be reduced.

  The engine cover 32 constitutes a part of the engine 2. The engine cover 32 protrudes from the side wall 33 toward the left side wall 6. A side wall portion 35 extends rearward from a portion of the right side wall 5 where the engine cover 32 is formed, and a rear leg portion 34 is formed at an end thereof. A rubber mount 34 a that absorbs an impact when the portable engine generator 1 is lowered to the floor surface is attached to the rear leg portion 34.

  A shaft portion 45 is formed at the upper rear end of the right wall 5. The side wall surface of the shaft portion 45 bulges more than the side wall portion 33. The shaft portion 45 projects from the side wall portion 33 to the opposite side to the engine cover 32. A bolt hole 46 is formed in the upper portion of the shaft portion 45. The right side handle portion 9 b of the handle 9, the flange 7 a of the fuel tank 7, and the shaft portion 45 of the right side wall 5 are fastened together by a bolt hole 46 and a bolt 47. The bolt hole 46 and the bolt 47 correspond to the second fastening portion in the present invention.

  The shaft portion 45 has a semi-cylindrical shape with the longitudinal axis of the bolt 47 as the central axis, is formed downward from the fastening portion between the handle 9 and the fuel tank 7, and is connected to the engine cover 32. ing. The shaft portion 45 is formed with a linear recess 45b. The recess 45b has a shape in which a semi-cylindrical part is partially cut. The linear recess 45 b is parallel to the shaft portion 45. Thus, the shaft portion 45 does not have to be a complete semi-cylinder, and may have a shape in which a part of the semi-cylinder is cut. The right side wall 5 can be reduced in weight when a shape in which a part of the half cylinder is cut. The semi-cylindrical shape in the present invention means that the outer periphery of the cross section of the shaft portion 45 and the portion corresponding to the exposed surface is an arc shape, and the center angle of the arc is 90 degrees or more and 270 degrees or less.

  The lower end of the shaft portion 45 is connected to the engine cover 32. Since the engine cover 32 is formed so as to protrude from the right side wall 5 toward the left side wall 6, the engine cover 32 has high rigidity. Since the shaft portion 45 is formed so as to protrude from the right side wall portion 5 to the opposite side of the engine cover 32, the shaft portion 45 has high rigidity. Since the engine cover 32 and the shaft portion 45 are formed so as to protrude to the opposite sides from the right side wall 5, the rigidity is higher than that of each of the engine cover 32 and the shaft portion 45. By making the engine cover 32 and the shaft portion 45 connected to each other, the rigidity of the right side wall 5 is increased, so that the load due to the weight of the components located above the engine cover 32 is increased via the shaft portion 45. And transmitted to the engine cover 32. Thereby, it is possible to prevent the right side wall 5 from being cracked by an impact when the portable engine generator 1 is placed on the ground. Further, when the portable engine generator 1 is lifted from the ground, the right side wall 5 may break even if the load of the portable engine generator 1 is concentrated on the fastening portion between the handle 9, the flange 7a, and the shaft portion 45. Can be prevented.

  Moreover, since the front leg part 31 is linearly formed downward from the connection part with the fuel tank 7, the rigidity is high. As described above, the side wall portion 33 surrounded by the highly rigid front leg portion 31, the shaft portion 45, and the engine cover 32 does not require high rigidity, so that the thickness can be reduced. Thereby, the right side wall 5 can be reduced in weight.

  Further, since the central axis of the shaft portion 45 is arranged behind the crankshaft shaft center 24a and ahead of the rear leg portion 34, the space above the rear leg portion 34 can be used effectively. For example, the upper portion of the engine 2 can be disposed above the rear leg portion 34, and the width of the engine generator 1 can be reduced.

  A window 49 that is a through hole is formed in the side wall 33 between the front leg portion 31 and the shaft portion 45. On the extension of the window 49, a cock 50 connected to the lower portion of the fuel tank 7 is disposed. The cock 50 adjusts the amount of fuel supplied from the fuel tank 7 to the engine 2. An operator can adjust the cock 50 by inserting a hand into the window 49. Moreover, the right side wall 5 can be reduced in weight by forming the window 49 in the right side wall 5.

4). Left side wall of portable engine generator The configuration of the left side wall 6 will be described with reference to FIGS. 4 and 7. 7 is a view of the left side wall 6 in the direction of arrow B in FIG.

  The left side wall 6 includes a front leg part 51, a generator cover 52, a side wall part 53, a rear leg part 54, a side wall part 60, and a shaft part 57. The front leg portion 51, the generator cover 52, the side wall portion 53, the rear leg portion 54, the side wall portion 60, and the shaft portion 57 are integrally formed by die casting. A muffler cover 21 is attached to the rear end of the left side wall 6.

  A bolt hole 55 is formed in the upper part of the front leg portion 51 formed at the front end portion of the left side wall 6. The flange 7 a of the fuel tank 7 and the front leg portion 51 of the left side wall 6 are fastened with bolts 56. Bolt hole 55 and bolt 56 are equivalent to the 1st conclusion part in the present invention. That is, the fuel tank 7 and the left side wall 6 are fixed on the upper surface of the front leg portion 51 that is the front end portion of the left side wall 6. A columnar front leg 51 is formed linearly from the fixed position to the floor surface with the longitudinal axis of the bolt 56 as the central axis. A rubber mount 51 a is attached to the lower end of the front leg portion 51.

  The front leg 51 has a cylindrical shape. The front leg 51 is formed with a linear recess 51b. The recess 51b has a shape in which a part of the side surface of the front leg portion 51 is cut into a straight line. The recess 51 b is parallel to the longitudinal direction of the front leg portion 51. Thus, the front leg part 51 does not need to be a perfect cylinder, and the shape by which a part of cylinder was shaved may be sufficient. The left side wall 6 can be reduced in weight when a part of the cylinder is cut off. Moreover, the front leg part 51 arrange | positioned at the front-end part of the left side wall 6 is formed in a column shape, and the intensity | strength of the front corner of the portable engine generator 1 can be raised. Thereby, damage to the front corner of the portable engine generator 1 can be prevented. Moreover, the impact on the object colliding with the front corner of the portable engine generator 1 can be reduced.

  The generator cover 52 constitutes a part of the generator 3. The generator cover 52 is formed to protrude from the side wall 53 to the right side wall 5 side and the opposite side. A side wall 60 extends rearward from the portion where the generator cover 52 is formed so as to protrude from the left side wall 6 toward the right side wall 5. A rear leg 54 is formed at the end of the side wall 60. A rubber mount 54 a that absorbs an impact when the portable engine generator 1 is lowered to the floor surface is attached to the rear leg portion 54.

  A shaft portion 57 is formed above the generator cover 52. The side wall surface of the shaft portion 57 bulges more than the side wall portion 53. The shaft portion 57 protrudes from the side wall portion 53 to the opposite side of the right side wall 5 side. A bolt hole 58 is formed in the upper portion of the shaft portion 57. The left side handle portion 9 b of the handle 9, the flange 7 a of the fuel tank 7, and the shaft portion 57 of the left side wall 6 are fastened together by a bolt hole 58 and a bolt 59. The bolt hole 58 and the bolt 59 correspond to the second fastening portion in the present invention.

  The shaft portion 57 has a semi-cylindrical shape with the longitudinal axis of the bolt 59 as the central axis, and is formed below the fastening portion between the handle 9 and the fuel tank 7 and connected to the generator cover 52. Yes. The shaft portion 57 is formed with a linear recess 57b. The recess 57b has a shape in which a half cylinder is partially cut. Thus, the shaft part 57 may not be a complete semi-cylinder, and may be a shape in which a part of the semi-cylinder is cut. The left side wall 6 can be reduced in weight when the semicircular cylinder is partially cut.

  The lower end of the shaft portion 57 is connected to the generator cover 52. The generator cover 52 formed so as to protrude from the left side wall 6 toward the right side wall 5 has high rigidity. Since the shaft portion 57 is formed to protrude from the left side wall portion 6 to the opposite side of the right side wall 5 side, the shaft portion 57 has high rigidity. Since the generator cover 52 and the shaft portion 57 are formed so as to protrude to the opposite sides from the left side wall 6, the generator cover 52 and the shaft portion 57 have higher rigidity than those formed independently. By making the shape that connects the generator cover 52 and the shaft portion 57, the rigidity of the left side wall 6 is increased, so that the load due to the weight of the component located above the generator cover 52 is reduced. It can be transmitted to the generator cover 52 via. Thereby, it is possible to prevent the left side wall 6 from being cracked by an impact when the portable engine generator 1 is placed on the ground. Further, when the portable engine generator 1 is lifted from the ground, the left side wall 6 may break even if the load of the portable engine generator 1 is concentrated on the fastening portion between the handle 9, the flange 7a, and the shaft portion 57. Can be prevented.

  Further, since the front leg portion 51 is formed linearly downward from the connecting portion with the fuel tank 7, it has high rigidity. As described above, the side wall portion 53 surrounded by the highly rigid front leg portion 51, the shaft portion 57, and the generator cover 52 does not require high rigidity, so that the thickness can be reduced. Thereby, the left side wall 6 can be reduced in weight.

  Further, since the central axis of the shaft portion 57 is disposed behind the crankshaft shaft center 24a and in front of the rear leg portion 54, the space above the rear leg portion 54 can be used effectively. For example, the muffler cover 21 can be disposed above the rear leg portion 54, and the width of the engine generator 1 can be reduced.

  According to the portable engine generator 1 of the present embodiment, the handle 9 is not attached to the upper surface of the fuel tank 7. By fastening the handle 9, the fuel tank 7, and each side wall together, the reinforcing material of the fuel tank 7 can be omitted, and the portable engine generator 1 can be made lighter than before. Further, rather than fastening the handle 9 and each side wall and fastening the fuel tank 7 and each side wall, the handle 9, the fuel tank 7 and each side wall are fastened together, so that one set on the side wall on one side. The fastening member can be reduced. By reducing the number of fastening members, the portable engine generator 1 can be reduced in weight.

  The front leg portions 31 and 51 formed in a straight line function as one rigid body and absorb an impact when the portable engine generator 1 is lowered to the ground. Since the front legs 31 and 51 function as one rigid body, the structural strength of the right side wall 5 and the left side wall 6 is increased. Further, conventionally, the thickness of the side wall portion 76 shown in FIG. 10 had to be increased as a whole, but in the above embodiment, the cross-sectional shapes of the front leg portions 31 and 51 and the shaft portions 45 and 57 are cylindrical or semi-circular. What is necessary is just to form in a column shape. Thereby, the thick part of the right side wall 5 and the left side wall 6 can be decreased. Therefore, the portable engine generator 1 can be reduced in weight.

In the portable engine generator 1 of the present embodiment, the straight front leg portions 31 and 51 extend vertically downward from the first fastening portion. Linear shaft portions 45 and 57 extend vertically downward from the second fastening portion. The flange 7a has a horizontal flange surface. The front leg portions 31 and 51 and the shaft portions 45 and 57 are perpendicular to the flange surface of the flange 7a. In the portable engine generator 1, the front leg portions 31, 51, the shaft portions 45, 57, and the flange 7a are combined to constitute a frame of the portable engine generator 1.
The structure of the portable engine generator 1 described above can also be referred to as a monocoque structure. The die-cast member constituting the main body has front leg portions 31 and 51 and shaft portions 45 and 57. The front leg portions 31 and 51 and the shaft portions 45 and 57 serve as a skeleton of the portable engine generator 1.
In the conventional portable engine generator, the plurality of legs corresponding to the front leg portions 31 and 51 and the shaft portions 45 and 57 in this embodiment simply have a function of installing the portable engine generator 1 on the ground. It was. Further, the flange of the fuel tank corresponding to the flange 7a in this embodiment simply has a function of ensuring the strength of the fuel tank 7 and preventing the deformation and breakage of the fuel tank 7.
On the other hand, the front leg parts 31 and 51, the shaft parts 45 and 57, and the flange 7a in a present Example have the function as a flame | frame of the portable engine generator 1 in addition to the conventional function. Thereby, even if it does not have a pipe which a pipe type generator has, the intensity | strength of a portable engine generator is securable.
Further, the forefront of the front leg portion 31 is positioned in front of the front surface of the operation panel 4 (FIGS. 1 and 3). The front leg portion 31 and the shaft portion 45 bulge to the side (right side) from the surface of the side wall portion 33 (FIGS. 3 and 6). The front leg portion 51 and the shaft portion 57 bulge laterally (leftward) from the surface of the side wall portion 53 (FIGS. 4 and 7). The flange 7 a protrudes forward from the front surface of the operation panel 4. The flange 7a protrudes to the side (left and right sides) from the surfaces of the side wall portions 33 and 53 (FIG. 2). Thereby, the frame comprised by the front leg parts 31 and 51, the shaft parts 45 and 57, and the flange 7a also has a function which protects the operation panel 4 and the side wall parts 33 and 53. FIG. Therefore, it is possible to reduce the possibility that an object contacts the operation panel 4 and the side wall portions 33 and 53. As a result, damage to the operation panel 4 and the side walls 33 and 53 can be prevented.
In the portable engine generator 1 of the present embodiment, the two side handle portions 9b extend vertically upward from the second fastening portion. An upper handle portion 9a is provided between the two side handle portions 9b. The upper handle 9a extends in the horizontal direction. The upper handle portion 9a and the flange surface of the flange 7a are substantially parallel. As a result, the handle 9 also constitutes the frame of the portable engine generator 1.
In the conventional portable engine generator 71 shown in FIG. 10, the handle 72 corresponding to the handle 9 in the present embodiment simply has a function for carrying the portable engine generator.
On the other hand, the handle 9 in this embodiment has a function as a frame of the portable engine generator 1 by being combined with the front legs 31, 51, the shafts 45, 57 and the flange 7a in addition to the conventional functions. Have. Thereby, the strength of the portable engine generator can be further increased.
The upper handle portion 9a is provided so as not to overlap the tank cap 10 in plan view (FIG. 2). That is, the upper handle portion 9 a is arranged so as to avoid the tank cap 10 protruding upward from the upper surface of the fuel tank 7. Accordingly, when the upper handle portion 9a is gripped, the tank cap 10 does not get in the way, so that the upper handle portion 9a can be arranged at a low position, and the two side handle portions 9b can be shortened. By shortening the two side handle portions 9b, the bending moment generated in the upper handle portion 9a is reduced when a force is applied to the second fastening portion. Thereby, the intensity | strength as a flame | frame of a portable engine generator can be raised. Furthermore, the portable engine generator can be reduced in weight by shortening the two side handle portions 9b.
The engine cover 32 is located below the side wall portion 33 and the shaft portion 45 and behind the front leg portion 31, and is in contact with (or arranged at a distance from) the front leg portion 31, and the shaft portion 45 and the rear leg portion. 34. The generator cover 52 is positioned below the side wall portion 53 and the shaft portion 57 and behind the front leg portion 51, contacts the front leg portion 51 (or is disposed with a gap), and is connected to the shaft portion 57. It is arranged between the rear leg 54. The engine cover 32 and the generator cover 52 arranged in this way also constitute the frame described above. The engine cover 32 and the generator cover 52 correspond to the case portion in the present invention.
Further, the side handle portion 9 b is located outside the side surface of the upper portion of the fuel tank 7.
In the conventional portable engine generator 71 shown in FIG. 10, the side surface of the fuel tank 73 is exposed, but in this embodiment, the handle side portion 9 b is located outside the side surface of the upper portion of the fuel tank 7. is doing. Therefore, the handle 7 of the seventh embodiment has a function of protecting the side surface of the upper portion of the fuel tank 7. As described above, in the portable engine generator 1 of the present embodiment, the front legs 31, 51, the shafts 45, 57, the flange 7a, and the handle 9 have a function of ensuring the strength of the portable engine generator 1, and And a function of protecting the components of the type engine generator 1.
Further, in the portable engine generator 1 of the present embodiment, the fuel tank 7 is arranged so that half or more of the height is lower than the upper surfaces of the side walls 5 and 6. That is, the height from the flange surface of the flange 7a to the upper surface of the fuel tank 7 (height of the upper half 7b) h1 is the height from the flange surface of the flange 7a to the lower surface of the fuel tank 7 (of the lower half 7c). Height) shorter than h2.
The lower half 7c of the fuel tank 7 is surrounded by a frame constituted by the front leg portions 31, 51, the shaft portions 45, 57, and the flange 7a. The portable engine generator 1 is excellent in protecting the fuel tank 7 because the volume of the lower half 7c is large.
Further, since the horizontal flange surface of the flange 7a is located at a position higher than half of the height of the fuel tank 7, the gap G between the flange 7a and the muffler cover 21 can be secured at a high position (FIG. 3). Thereby, the ease of carrying around by one person of the portable engine generator 1 can be improved. This point will be described with reference to FIG.
FIG. 9A is a side view schematically showing a portable engine generator in which the flange is disposed at a relatively high position. FIG. 9B is a side view schematically showing a portable engine generator in which the flange is disposed at a relatively low position.
Each symbol in the figure is as follows.
F (F1, F2) Flange H (H1, H2) Height from the flange surface of the flange F L (L1, L2) Height from the flange surface of the flange F to the upper surface of the fuel tank C (C1, C2) Orientation of cylinder (not shown) A (A1, A1) Cylinder inclination angle P (P1, P2) Spark plug cap G (G1, G2) To perform attachment / detachment of spark plug cap P and maintenance work of spark plug G (D1, D2) Depth of portable engine generator When FIG. 9 (a) is compared with FIG. 9 (b), the flange F1 is disposed at a position higher than the flange F2. H1 is greater than H2. L1 is smaller than L2. Therefore, the position of the gap G1 is higher than the gap G2.
Since the position of the gap G1 is high, the spark plug cap P1 can be disposed at a high position. The position of the cap P1 is higher than the gap P2.
In order to place the spark plug cap P1 at a high position, it is necessary to change the direction C1 of the cylinder. Specifically, the cylinder must be arranged more vertically. C1 stands more than C2. A1 is greater than A2. As a result, the amount of protrusion of the cylinder in the depth direction is reduced, so that the depth D1 of the portable engine generator is reduced. D1 is smaller than D2. That is, by disposing the flange F1 at a high position, the depth D1 of the portable engine generator can be reduced without narrowing the gap G1 for performing the maintenance work of the spark plug.
In the portable engine generator of this embodiment, the merit obtained by reducing the depth is great.
The portable engine generator of the present embodiment is a one-person portable engine generator. The handle is disposed at a central portion of the upper surface of the main body so as to be along the longitudinal direction of the upper surface of the main body. Therefore, when one person holds the handle and lifts the portable engine generator, the surface in the depth direction (front or back) faces the body. If lifted with one hand, the surface of the portable engine generator in the depth direction will face the side of the thigh, knee, etc. When lifted with both hands, the surface of the portable engine generator in the depth direction faces the front of the thighs, knees, etc.
By reducing the depth of the portable engine generator, it is possible to weaken the contact of the portable engine generator with the thighs, knees, etc., so that walking becomes easier. Even if you hold it with one hand, it will be hard for you to get tired because the sides will not open. Even when holding with both hands, it is difficult for the sides to open and the waist to bend, so it is possible to reduce fatigue on the hands and burden on the waist. Therefore, portability can be improved.
The present invention is not limited to the above embodiment, and can be modified as follows.

In the above embodiment, the engine 2 is arranged on the right side of the portable engine generator 1 and the generator 3 is arranged on the left side, but the engine 2 is arranged on the left side of the portable engine generator 1 and the right side. A configuration in which the generator 3 is arranged in the above may be used. That is, the present invention is not limited by the positional relationship in the left-right direction of each component in the above embodiment. Even if the positions in the left and right directions of the respective components in the above embodiment are switched between right and left, the effects of the present invention can be achieved and the problems of the present invention can be solved as in the above embodiments.
In the said Example, although the flange 7a is horizontal, this invention is not limited to this example, The flange may incline.
In the said Example, although the case where a front leg part was a column shape was demonstrated, this invention is not limited to this example. The front leg part should just be column shape. Examples of the columnar shape include a cylindrical shape, a prismatic shape, and an elliptical shape.
In the above embodiment, the case where the shaft portion has a semi-cylindrical shape has been described, but the present invention is not limited to this example. The shaft portion may be a semi-columnar shape. Examples of the semi-pillar shape include a semi-cylindrical shape and a semi-elliptical shape. The half columnar shape may be a shape obtained by cutting a polygonal column along the longitudinal direction of the polygonal column. The half columnar shape may be a shape obtained by cutting a column along the longitudinal direction of the column, and is not necessarily exactly half the column shape.

DESCRIPTION OF SYMBOLS 1 ... Portable engine generator 2 ... Engine 3 ... Generator 4 ... Operation panel 5 ... Right side wall 6 ... Left side wall 7 ... Fuel tank 7a ... Flange 9 ... Handle 31, 51 ... Front leg part 31b, 51b ... Depression 32 ... Engine Covers 34, 54 ... rear leg parts 41, 46, 55, 58 ... bolt holes 42, 47, 56, 59 ... bolts 45, 57 ... shaft parts 49 ... windows 50 ... cocks

Claims (14)

A portable engine generator with an operation panel on the front,
Engine,
A generator that generates electricity by rotating the engine;
Side walls respectively disposed on both sides of the operation panel;
A fuel tank on the side surface with a flange in contact with the upper surface of the side wall;
A handle that spans the upper surface of one of the sidewalls disposed on both sides of the operation panel and the upper surface of the other sidewall above the fuel tank;
The side wall
A first fastening portion for fastening the side wall and the flange at a front end portion of the side wall;
A second fastening part for fastening together the end of the handle, the flange and the side wall so that the end of the handle is in contact with the flange;
A case portion formed at a lower portion of the side wall and covering a part of either the engine or the generator;
A straight front leg portion formed downward from the first fastening portion;
A portable engine generator having a rear leg portion formed behind the case portion. The portable engine generator according to claim 1,
The front leg portion is a portable engine generator having a columnar shape centered on a vertical axis passing through the first fastening portion. The portable engine generator according to claim 2,
A depression is formed on the side of the front leg,
The portable engine generator, wherein the recess is linear and parallel to the longitudinal direction of the front leg. The portable engine generator according to claim 1,
The side wall is formed with a shaft part in which the side wall surface bulges from the second fastening part to the case part,
The shaft portion is linear and is parallel to the front leg portion. The portable engine generator according to claim 4,
The shaft portion has a semi-columnar shape centering on a longitudinal axis passing through the second fastening portion. The portable engine generator according to claim 5,
A depression is formed on a side surface of the shaft portion,
The portable engine generator, wherein the recess is linear and parallel to the longitudinal direction of the shaft portion. The portable engine generator according to claim 1,
A portable engine generator in which more than half of the height of the fuel tank is lower than the upper surface of the side wall. The portable engine generator according to claim 4 ,
A cock for adjusting the amount of fuel supplied from the fuel tank to the engine;
One of the side walls is provided with a window between the front leg portion and the shaft portion,
A portable engine generator in which the cock is arranged to be operable through the window. The portable engine generator according to claim 4,
The portable engine generator is arranged such that a central axis of the shaft portion is arranged behind the center of the crankshaft of the engine and ahead of the rear leg portion. The portable engine generator according to claim 1,
The flange has an annular shape in plan view, along the entire outer edge of the fuel tank,
The flange surface of the flange is horizontal;
The front leg portion extends vertically downward from the first fastening portion,
The shaft portion extends vertically downward from the second fastening portion,
The portable engine generator, wherein the front leg portion, the shaft portion, and the flange constitute a frame of the portable engine generator. The portable engine generator according to claim 10,
The portable engine generator, wherein the front surface of the front leg is positioned forward of the front surface of the operation panel. The portable engine generator according to claim 10,
The said flange is a portable engine generator which protrudes ahead rather than the front surface of the said operation panel. The portable engine generator according to claim 10,
The handle comprises two side handle portions and an upper handle portion provided between the two side handle portions,
The side handle portion extends vertically upward from the second fastening portion,
The upper handle portion extends in a horizontal direction,
The portable engine generator, wherein the handle also constitutes a frame of the portable engine generator. The portable engine generator according to claim 10,
The case portion is located below the shaft portion and behind the front leg portion, is in contact with the front leg portion, and is disposed between the shaft portion and the rear leg portion,
The portable engine generator, wherein the case portion also constitutes a frame of the portable engine generator.

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