JP4327527B2 - Engine generator - Google Patents

Description

  The present invention relates to an engine generator that drives a power generator by an internal combustion engine, and more particularly to an engine generator in which a fuel tank filler port is provided on the muffler side.

  The engine generator includes a cooling fan that generates cooling air blown toward the engine, a recoil starter for starting the engine, a muffler, a fuel tank, and the like in addition to the engine that drives the power generator. In order to reduce engine noise transmitted from the engine generator to the outside, the engine generator has a form in which the engine or the like is accommodated in a soundproof case, and the soundproof case is generally a rectangular parallelepiped as a whole. A carrying handle, i.e., a handle, used when an operator carries the engine generator is provided at the top of the soundproof case. In a normal engine generator, the fuel tank filler port is provided at a position away from the muffler (see Patent Document 1), but when an operator carries the engine generator with a handle. In order to improve transport workability, the engine generator can be miniaturized by incorporating a predetermined member into the soundproof case in a compact manner, and the center of gravity of the engine generator should be below the handle. preferable.

  In consideration of transportation workability, the fuel tank has a main tank part with a large vertical dimension and a tank inlet part having a small vertical dimension and extending toward the muffler above the engine. Then, it was found that it is possible to position the center of gravity of the engine generator below the handle both when the fuel is full and when the remaining amount is reduced. When such an irregular fuel tank is mounted on an engine generator, it is necessary to provide an oil filler port above the muffler, and it is necessary to prevent the fuel dripping from the fuel filler port from reaching the muffler. Moreover, it is necessary to prevent the fuel dripping from the fuel supply port from scattering.

In mobile agricultural machines such as rice transplanters and tractors, the fuel spilled from the fuel filler port should be separated from the muffler so that fuel does not drip into the muffler even if fuel spills from the fuel filler port located near the muffler. A guide member for guiding is provided on the muffler (see Patent Documents 2 to 5).
JP 2001-27126 A JP-A-8-324263 Japanese Patent Laid-Open No. 9-2083 JP-A-10-227262 JP-A-11-91628

  In mobile agricultural machines, fuel tanks and mufflers are often mounted so that they are exposed to the outside. On the other hand, generator components such as power generators, including engines, are built into soundproof cases. In an engine generator, a muffler is disposed on one end of a soundproof case, the muffler is covered with a soundproof case, and a cooling air discharge port is formed in a portion of the soundproof case that covers the muffler so that cooling air is blown around the muffler. Need to flow. Therefore, when fuel is dripped to the cooling air discharge port when fuel is injected into the fuel tank, the fuel enters the muffler from the cooling air discharge port, or the fuel is The fuel is scattered by the cooling exhaust air discharged from the cooling air exhaust port.

  An object of the present invention is to prevent fuel from entering the muffler side even when fuel droops from a fuel filler port of an engine generator, and to prevent scattering of fuel due to cooling exhaust air from a cooling air outlet.

An engine generator according to the present invention includes a power generator disposed on one side of an engine and driven by the engine, a muffler disposed on the other side of the engine to mute engine exhaust gas, and a soundproof case that houses them. in machine, the main tank portion which is arranged above the power generating body, and the have a inlet portion fuel supply port is provided which passes through the upper wall of the soundproof case extends along the upper side of the engine in the soundproof case a fuel tank that will be housed in, is openably attached to the soundproofing case, a cover for guiding the fuel dripping from the fuel supply port on a side surface of said soundproof case, collision extend in the width direction on an end face of the soundproof case is set, the guide vanes for guiding a fuel dripping from the opening in the cover to the side of the soundproof case, provided in the soundproof case, either the fuel supply port Sagging fuel anda protrusion portion for guiding toward the cover, the cover is characterized in that the opening degree of contact with the guide vane is regulated.

  Further, the engine generator according to the present invention has the inflow prevention protrusion for guiding the fuel dripping toward the end face of the soundproof case toward the cooling air discharge port formed on the end face and guiding it to both sides of the end face. It is provided on the end face of the soundproof case.

  According to the engine generator of the present invention, the opening / closing cover is disposed adjacent to the fuel filler port, and the fuel spilled from the fuel filler port flows to the side surface side without flowing to the end portion side of the engine generator by the opening / closing cover. It will be. Even if the fuel drips from the opening / closing cover to the end side of the engine generator, the dripping fuel is guided to the side surface side of the engine generator by the guide vanes, so that it does not flow to the end side. This prevents dripping fuel from entering the cooling air discharge port formed in the soundproof case, and prevents the fuel from being scattered by the cooling exhaust air from the cooling air discharge port.

  Even if the dripping fuel exceeds the guide vane, the inflow prevention protrusion is provided on the end face of the soundproof case, so that the drooping fuel is guided to the side of the soundproof case and enters the cooling air discharge port. It is prevented.

  In this way, the fuel dripping into the cooling air discharge port is surely prevented from entering, so that it is possible to reliably prevent the fuel from being scattered due to the cooling exhaust air from the cooling air discharge port, and at the end of the soundproof case. It is possible to prevent fuel from entering the muffler side arranged on the part side.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an appearance from the front side of an engine generator according to an embodiment of the present invention, FIG. 2 is a perspective view showing an appearance from the back side of the engine generator, and FIG. It is a longitudinal cross-sectional view of an engine generator.

  This engine generator has a soundproof case 10, and the soundproof case 10 is formed by combining left and right case bodies 11 and 12. The combined soundproof case 10 has a front surface 10a, a back surface 10b, left and right side surfaces 10c and 10d, and a top wall 10e, and is attached to the bottom plate 13. A front panel 14 as one end wall is attached to the end face on the front face 10a side of the soundproof case 10, and a rear panel 15 as the other end wall is attached to the end face on the back face 10b side. . The front panel 14 and the back panel 15 constitute a part of the soundproof case 10, and the soundproof case 10 has a substantially rectangular parallelepiped shape as a whole including the bottom plate 13 and both the panels 14 and 15. The upper part of the soundproof case 10 is provided with a carrying handle, that is, a handle 16 that is used when an operator carries the engine generator. The handle 16 is formed by joining two case bodies 11 and 12 together. The 1 and 2, reference numeral 9 indicates a mating surface between the two case bodies 11 and 12.

  The left and right case bodies 11, 12, the front panel 14 and the back panel 15 are each made of synthetic resin, the bottom plate 13 is made of metal, and four support pieces 17 made of rubber or resin are attached to the bottom plate 13. The engine generator is supported on the base by the support piece 17. An operation panel 18 is provided on the front panel 14. The operation panel 18 includes an engine switch, AC and DC terminals for outputting generated power, and an operation for indicating that the generator is operating. A display unit and the like are provided. However, the operation panel 18 is omitted in FIG. On the other hand, the left and right case bodies 11 and 12 are detachably attached with covers 19 that can be removed during maintenance of the devices incorporated therein.

  As shown in FIG. 3, the engine unit 20 incorporated in the soundproof case 10 has an engine 23 including a crankcase 21 and a cylinder 22 on the upper side, and a cylinder head 24 is attached to the cylinder 22. The engine 23 is mounted in the vertical direction so that the crankshaft 25 incorporated in the crankcase 21 faces the longitudinal direction of the soundproof case 10. The position in the longitudinal direction where the engine 23 is mounted is set at a position closer to the back panel 15 than the central part in the longitudinal direction, and is attached to the bottom plate 13 via vibration-proof rubber.

  A flywheel 26 is fastened to the crankshaft 25 with bolts 27, and a recoil starter recoil pulley 28 is disposed between the flywheel 26 and the engine 23, and the recoil pulley 28 rotates relative to the crankshaft 25. It is free. When the recoil rope 29 wound around the recoil pulley 28 is pulled out, a claw member (not shown) provided on the recoil pulley 28 engages with the flywheel 26 and the crankshaft 25 rotates via the flywheel 26 to start the engine. can do. A protrusion 30a is provided on the outer periphery of the flywheel 26, and a sensor 30b for detecting the protrusion 30a is provided on the engine 23. The rotation angle of the crankshaft 25 is detected by the sensor 30b to determine the ignition timing of the engine. It is done. In order to set the phase in the rotational direction of the crankshaft 25 and the flywheel 26 to match the ignition timing, a key and an engagement pin (not shown) are attached between the crankshaft 25 and the flywheel 26.

  A cooling fan 31 having a disk 31 a and a large number of fan blades 31 b protruding axially toward the engine side is attached to the flywheel 26, and the cooling fan 31 is driven by the crankshaft 25. Then, cooling air flowing toward the engine 23 is generated. In order to guide the cooling air generated by the cooling fan 31 toward the engine 23, a fan cover 32 is attached to the engine 23 so as to cover the cooling fan 31, and the shroud 32 a is connected to the fan cover 32 so that the shroud 32 a is connected to the engine 23. It is attached to the unit 20.

  A power generation body 33 is provided in front of the crankshaft 25, and the power generation body 33 has a stator 35 fixed to a holder 34 fixed to the fan cover 32, and an outer rotor 36 attached to the flywheel 26. ing. The stator 35 has an iron core 35a fixed to the holder 34 and a plurality of coils 35b wound around the outer periphery of the iron core 35a. The outer rotor 36 is provided on the inner peripheral surface of the holder 36a having a cup-shaped cross section and the cylindrical portion of the holder 36a. And a magnet 36b to be fixed.

  Therefore, the power generator 33 is an outer rotor type, and when alternating current is output by the generator, the generated voltage is once converted to direct current and then converted into alternating current of a desired frequency and output. An inverter circuit for performing this conversion control is provided in the control unit 37. The control unit 37 also controls the ignition timing of the engine. An inner rotor type power generator 33 can also be mounted.

  A muffler 40 is attached to the engine 23 to mute the combustion exhaust gas from the engine 23, and the muffler 40 is disposed inside a back panel 15 provided at the rear end portion of the soundproof case 10. On the other hand, a fuel tank 42 for storing fuel supplied to the engine 23 is mounted on the upper portion in the soundproof case 10. The fuel tank 42 includes a main tank portion 42 a disposed at an upper portion of the power generation body 33 and an inlet portion 42 b that is integrated with the main tank portion 42 a and extends toward the rear end portion of the soundproof case 10 along the cylinder head 24. Have. The front end surface of the main tank portion 42 a protrudes larger than the front end surface of the power generator 33 toward the front panel 14. The main tank portion 42 a is integrally provided with a bottom tank 42 c, and the bottom tank 42 c enters between the power generator 33 and the side surface of the one case body 11. Further, a part of the inlet portion 42 b protrudes toward the other case body 12.

  As described above, the fuel tank 42 is mounted on the upper portion of the soundproof case 10, and the volume of the front side of the soundproof case 10, which is the opposite side of the engine unit 20, is large. Moreover, the front end face of the main tank portion 42 a of the fuel tank 42 protrudes larger toward the front panel 14 than the front end face of the power generator 33. Therefore, a relatively heavy engine 23 is disposed on the rear end side of the engine generator, and a relatively heavy power generator 33 is disposed on the front end side so as to balance the weight of the engine 23 and fuel. The main tank portion 42a of the tank 42 protrudes toward the front panel 14 toward the front end portion, and the center of gravity in the longitudinal direction of the engine generator including the weight of the fuel in the fuel tank 42 is set at the center. .

  Corresponding to the position of the center of gravity, the handle 16 is provided close to the front end side of the soundproof case 10, the fuel filler port 43 of the fuel tank 42 is provided on the muffler 40 side, and the exhaust pipe 41 of the muffler 40 is provided on the rear panel. 15 is opened to the discharge port formed in 15. A fuel filler port 43 of the fuel tank 42 is attached to an inlet portion 42 b of the fuel tank 42 and projects upward through the soundproof case 10. A tank cap 44 is detachably attached to the fuel filler opening 43, and the tank cap 44 is removed when fuel is injected into the fuel tank 42.

  A plurality of main cooling air inlets 45 are provided at the lower end portion of the front panel 14 provided on the front side of the soundproof case 10, and each main cooling air inlet 45 extends in the left-right direction on the front panel 14. A plurality of louvers 46 are provided. On the other hand, the back panel 15 provided on the back side of the soundproof case 10 is provided with a plurality of cooling air discharge ports 47, and each cooling air discharge port 47 is provided to extend in the left-right direction on the back panel 15. A plurality of louvers 48 are formed. Thereby, when the engine 23 is driven, cooling air is generated by the cooling fan 31 driven by the crankshaft 25, and external air flows from the main cooling air inlet 45 into the soundproof case 10. Inflow. The inflowed air flows around the control unit 37 and the power generator 33 as shown by arrows in FIG. 3, and further flows around the engine 23 to cool them, and then flows around the muffler 40 to cool it. The air is discharged from the cooling air outlet 47 to the outside.

  A plurality of sub cooling air inlets 49 are formed at upper portions of the rear end portions of the left and right case bodies 11 and 12 so as to correspond to the inlet portions 42 b of the fuel tank 42. Therefore, external air flows in as a subcooling air flow from the subcooling air inlet 49 due to the negative pressure generated around the fuel tank 42 by the cooling fan 31, and this inflow air causes the fuel tank 42 and the fuel tank 42 to flow. The occurrence of stagnation of air around the cylinder head 24 disposed below the inlet portion 42b is prevented, and these are cooled. The air cooled around the fuel tank 42 and the cylinder head 24 cools the power generator 33 and the engine 23 together with the air flowing in from the main cooling air inlet 45 as indicated by an arrow, and then flows from the cooling air outlet 47 to the outside. Discharged.

  As described above, inside the soundproof case 10, the main cooling air flow from the main cooling air inlet 45 through the power generator 33 and the engine 23 to the cooling air outlet 47, and the sub cooling air inlet 49. Since a sub-cooling air flow that flows in the opposite direction to the main cooling air and reaches the cooling fan 31 is generated, the stagnation of air around the fuel tank 42, particularly the inlet portion 42 b of the fuel tank 42 and the cylinder head 24. Therefore, these can be reliably cooled, and not only the engine 23 but also the fuel tank 42 can be cooled.

  As shown in FIGS. 2 and 3, an opening / closing cover 51 is detachably attached to the upper surface of the rear end portion of the soundproof case 10 so as to cover a tank cap 44 that is detachably attached to the fuel filler opening 43. . The opening / closing cover 51 is provided with a hinge 52 supported by the soundproof case 10, and the opening / closing cover 51 is openable and closable around the hinge 52. A recess 53 for inserting a finger is formed in the opening / closing cover 51 when the operator performs an opening / closing operation.

  4 is a perspective view showing the outer surface of the open / close cover 51 in an open state, FIG. 5 is a perspective view showing the inner surface of the open / close cover 51 in an open state, and FIG. 6 is a partially enlarged sectional view of FIG. In these drawings, the tank cap 44 is shown in a removed state. As shown in the drawing, a fuel tray 54 is attached to the soundproof case 10, and projections 55 projecting upward and inclined outward are provided on the front side and the left and right sides of the fuel tray 54. ing. Therefore, when fuel is accidentally spilled on the fuel receiving tray 54 when fuel is injected into the fuel tank 42 from the fuel filler opening 43 with the open / close cover 51 opened, the projection 55 The fuel does not flow in the front and left and right directions of the soundproof case 10 but flows backward. The fuel that flows rearward flows toward the opening / closing cover 51 that is opened across the hinge 52.

  A guide vane 56 is provided at the upper portion of the rear end of the soundproof case 10 so as to protrude obliquely upward and rearward. The guide vane 56 extends in the width direction of the soundproof case 10. A guide groove 57 extending in the width direction is formed on the upper surface of the guide blade 56, and both ends of the guide groove 57 in the width direction are connected to the side surface of the soundproof case 10. Therefore, when a large amount of fuel is spilled into the fuel tray 54, it hangs down on both sides from the inner surface of the opening / closing cover 51, but the drooping fuel is guided to the left and right sides of the soundproof case 10 by the guide vanes 56. Become. As described above, the fuel dripping along both the left and right sides of the soundproof case 10 falls down without going around the cooling air discharge port 47 provided in the back panel 15. Thereby, the fuel dripping toward the surface of the back panel 15 covering the muffler 40 having a relatively high temperature is prevented from falling.

  The rear panel 15 for forming the end surface of the soundproof case 10 is provided with an inflow prevention protrusion 58 so as to cover a portion of the cooling air discharge port 47 formed by the louver 48. This inflow prevention protrusion 58 protrudes toward the rear of the back panel 15, and an arcuate portion 58 a provided above the cooling air discharge port 47 of the back panel 15, and a linear portion 58 b extending downward from both ends thereof. have. As a result, even if a large amount of fuel spills into the fuel receiving tray 54 so as to jump over the guide vanes 56 and sag to the back side of the soundproof case 10, the fuel dripping on the back side of the soundproof case 10, that is, the surface of the back panel 15, The inflow prevention protrusion 58 is guided to the left and right sides of the back panel 15 without entering the cooling air discharge port 47.

  Therefore, even if fuel is spilled from the fuel filler port 43 while fuel is being injected into the fuel tank 42, the fuel is reliably prevented from flowing from the cooling air outlet 47 to the muffler 40 side. Since the tank cap 44 is forgotten to be closed, the fuel is also prevented from flowing into the muffler 40 even when the fuel is spilled from the fuel filler opening 43 while the engine is operating. In addition, even if the fuel tank 42 is spilled from the fuel filler port 43 when fuel is injected, the fuel is surely eliminated from the cooling air outlet 47, so that the engine 23 is driven and the fuel is cooled to the cooling air outlet 47. The air is reliably prevented from being scattered by the cooling exhaust air discharged from the air.

  As shown in FIG. 6, when the opening / closing cover 51 is opened, the opening / closing cover 51 abuts against the guide vane 56 and the opening degree is regulated. Under the restricted opening, the inner surface of the opening / closing cover 51 is held substantially horizontally or slightly downwardly inclined so that dripping fuel can easily enter the inner surface of the opening / closing cover 51. .

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, the opening / closing cover 51 has a function as a cap cover for closing the fuel filler opening 43, but does not cover the tank cap 44 as long as the opening / closing cover 51 is provided in the vicinity of the filler opening 43. You may do it.

It is a perspective view which shows the external appearance from the front side of the engine generator which is one embodiment of this invention. It is a perspective view which shows the external appearance from the back side of an engine generator. It is a longitudinal cross-sectional view of an engine generator. It is a perspective view which shows the outer surface of the open / close cover of the open state. It is a perspective view which shows the inner surface of the open / close cover of the open state. It is a partially expanded sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Soundproof case 11, 12 Case body 14 Front panel 15 Rear panel 23 Engine 24 Cylinder head 25 Crankshaft 31 Cooling fan 33 Electric power generation body 40 Muffler 42 Fuel tank 42a Main tank part 42b Inlet part 43 Oil supply port 44 Tank cap 45 Main cooling wind Inlet 47 Cooling air outlet 49 Sub cooling air inlet 51 Opening / closing cover 56 Guide vane 58 Inflow prevention protrusion

Claims (2)

In an engine generator having a power generator arranged on one side of an engine and driven by the engine, a muffler arranged on the other side of the engine to mute engine exhaust gas, and a soundproof case for housing them.
The main tank part which is arranged above the power generating body, and the fuel supply port passing through the upper wall of the soundproof case extends along the upper side of the engine is accommodated in the soundproof case possess an inlet portion provided A fuel tank,
An opening / closing cover that is attached to the soundproof case so as to be freely opened and closed, and guides fuel drooping from the fuel filler port to a side surface of the soundproof case;
A guide vane that extends in the width direction on the end face of the soundproof case and guides fuel drooping from within the open / close cover to the side surface of the soundproof case ;
A projecting portion provided in the soundproof case and guiding the fuel drooping from the fuel filler opening toward the opening and closing cover;
The engine generator according to claim 1, wherein the opening / closing cover is in contact with the guide vanes to regulate an opening degree . 2. The engine generator according to claim 1, wherein the flow-inhibiting protrusion that guides both ends of the end face by preventing the fuel drooping toward the end face of the soundproof case from flowing toward the cooling air discharge port formed on the end face is provided. An engine generator provided on an end face of a soundproof case.

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