JP4233946B2 - Engine-driven generator - Google Patents

Description

  The present invention relates to an improvement of an engine-driven generator configured by supporting an engine and a generator driven by the engine on a frame.

Such an engine-driven generator is already known as disclosed in, for example, Patent Document 1 below.
Japanese Patent Laid-Open No. 11-36880

  Such engine-driven generators are widely used as temporary power supplies at construction sites and outdoors, so that their operating noise should be kept as low as possible in consideration of the impact on the work environment and surroundings. Is often required.

  Therefore, in the engine-driven generator disclosed in Patent Document 1, the frame itself is configured as a sound insulation case that covers the engine, the generator, and their attached devices to reduce operating noise. The case not only increases the overall size of the engine-driven generator, but also forces an increase in weight.

  The present invention has been made in view of the above points, and the engine-driven power generation has been made possible by reducing the operating noise by making the frame into a frame shape with an open periphery to achieve compactness. The purpose is to provide a machine.

In order to achieve the above object, the present invention provides an engine-driven generator configured by supporting an engine and a generator driven by the engine on a frame, wherein the frame has a U-shaped bottom. A frame and a pair of left and right U-shaped side frames that share the left and right sides of the bottom frame constitute a frame frame that is open to the periphery, and the outer periphery of the engine and the generator within the frame frame. In addition, a duct member defining a series of cooling air passages is disposed between them, and the cooling air passage is driven by the engine to pass through the cooling air passage from the upstream end side to the downstream end of the duct member. a cooling fan that generates a cooling air toward the side provided, at the upstream end of the duct member has a outside end inlet connected to the intake box for accommodating the electrical component, said co four corners of the intake box The open side of the letter-shaped side frame Detachably connected to the end portion to reinforce the frame-shaped frame, and the other end of the duct member, an exhaust port connected to an exhaust box that houses the exhaust muffler of the engine to the upper outer end The first feature is that the end of the outlet pipe of the exhaust muffler is opened at the lower part of the exhaust box away from the exhaust port .

  The intake port corresponds to the first and second intake louvers 38a and 38b in the embodiments of the present invention described later, the exhaust port corresponds to the exhaust louver 73, and the electrical components correspond to the control unit 53 and the inverter 54, respectively. To do.

  Further, in addition to the first feature, the present invention has a second feature that the intake box and the exhaust box are configured as an expansion silencer chamber.

  Furthermore, in addition to the second feature, the present invention has a third feature that a fuel tank covering the entire upper surface of the duct member is provided over the entire length of the duct member.

  Furthermore, in addition to the first or second feature, the present invention elastically supports the engine and generator assembly on the frame, and supports the duct member fixedly on the assembly. Is fixed to the frame, and the duct member and the intake box are connected via a seal member that allows relative displacement therebetween.

  The seal member corresponds to a first seal member 41 in an embodiment of the present invention described later.

  Furthermore, in the present invention, in addition to the first to fourth features, the generator is configured by a magnet generator including an outer rotor that is cantilevered by the crankshaft of the engine, and the outer rotor has an outer end surface on the outer end surface. A fifth feature is that a cooling fan is attached.

  In addition to the first feature, the present invention further includes an intake air amount control device for the engine and an air cleaner for purifying the intake air outside the duct member, and an air inlet of the air cleaner is provided in the intake box. The connection is a sixth feature.

  The intake air amount control device corresponds to a carburetor 44 in an embodiment of the present invention described later.

  According to the first aspect of the present invention, during the operation of the engine, the rotation of the cooling fan in the duct member causes outside air to be drawn into the intake box as cooling air, and flows in the duct member, that is, through the cooling air passage, It is discharged to the outside through the inside, while the electrical components can be cooled in the intake box, the engine and generator can be cooled in the duct member, and the exhaust muffler can be cooled in the exhaust box.

  The duct member also functions as a soundproof wall that blocks operating noise generated by the engine, the generator, and the cooling fan, and can ensure the quietness of the engine-driven generator.

  In addition, the duct member and intake / exhaust box are mounted on an open frame-type frame, so the engine-driven generator is more compact and lightweight than conventional ones that cover the entire engine-driven generator with a soundproof wall. In addition, it is possible to dispose reinforcements such as a carburetor and an air cleaner outside the duct member, thereby improving the maintainability thereof.

The exhaust box for accommodating the exhaust muffler of the engine has an exhaust port at the upper outer end, and the end of the exhaust muffler outlet pipe opens at the lower part of the exhaust box away from the exhaust port. The exhaust gas discharged from the outlet pipe can be mixed with cooling air in the exhaust box to lower the exhaust temperature, and at the same time, the exhaust noise can be effectively reduced.

In addition, the frame is formed by a frame-shaped frame having a U-shaped bottom frame and a pair of left and right U-shaped side frames that share the left and right side portions of the bottom frame. The frame is reinforced by an intake box with four corners detachably connected to each open end of the U-shaped side frame, thereby reducing the weight of the frame. Can do. Also, if the intake box is removed from the frame, the engine and generator can be attached and detached from the front side of the frame opened thereby, and the maintenance thereof can be performed easily.

  Further, according to the second feature of the present invention, even if operating noises of the engine, the generator, and the cooling fan are transmitted from the upstream end and the downstream end of the duct member to the intake box and the exhaust box, the intake box and the exhaust box are used. Thus, the operating noise can be effectively silenced, and the silence of the engine-driven generator can be further enhanced with a simple structure.

  Furthermore, according to the third feature of the present invention, the fuel tank cooperates with the duct member to form a double soundproof wall that covers the upper part of the engine and the generator, and the engine and generator operating noises. It is possible to effectively prevent the upward leakage of the engine and to further improve the quietness of the engine-driven generator with a simple structure.

  Furthermore, according to the fourth aspect of the present invention, vibration generated during operation of the engine can be absorbed by the elastic support portion between the engine and the frame to prevent or significantly reduce vibration transmission to the frame. . Moreover, even if engine vibration is transmitted to the duct member fixed to the engine, the vibration can be absorbed by the sealing member to prevent transmission to the intake box, and therefore cooling air from the intake box to the duct member can be prevented. Can be distributed efficiently without omission.

  Furthermore, according to the fifth feature of the present invention, a large-diameter cooling fan corresponding to the diameter of the duct member can be easily attached using the wide outer end surface of the outer rotor that is cantilevered by the crankshaft. , The cooling effect of the engine and generator can be enhanced.

  Furthermore, according to the sixth aspect of the present invention, during the intake stroke of the engine, the air in the intake box is sucked into the engine through the air cleaner and the intake air amount control device, so that the intake noise of the engine is also more effective by the intake box. Therefore, it can contribute to further improvement of the silence of the engine-driven generator.

  Embodiments of the present invention will be described below based on preferred embodiments of the present invention shown in the drawings.

  FIG. 1 is a side view of an engine-driven generator according to the present invention, showing a moving handle in use. 2 is a plan view of the engine-driven generator, FIG. 3 is a front view of the engine-driven generator, and FIG. 4 is a front view of the engine-driven generator when the moving handle is in a retracted state. 5 is a front view of the engine-driven generator shown with the box body of the intake box removed, FIG. 6 is a rear view of the engine-driven generator, and FIG. 7 is a partially broken view of the exhaust box. 8 is a rear view of the engine-driven generator, FIG. 8 is an exploded perspective view of a part of the engine-driven generator, FIG. 9 is a sectional view taken along line 9-9 in FIG. 3, and FIG. 10 is a sectional view taken along line 10-10 in FIG. 11 is a cross-sectional view taken along line 11-11 in FIG. 3, FIG. 12 is a cross-sectional view taken along line 12-12 in FIG. 11, FIG. 13 is a cross-sectional view taken along line 13-13 in FIG. 15 is an enlarged view of the moving handle portion of FIG. 1, and FIG. 16 is a cross section taken along line 16-16 of FIG. 17 is a sectional view taken along line 17-17 in FIG. 16, FIG. 18 is a sectional view taken along line 18-18 in FIG. 15, FIG. 19 is a sectional view taken along line 19-19 in FIG. It is sectional drawing.

  1 to 3, an engine-driven generator 1 according to the present invention includes a frame 2, an engine 3 and a generator 4 that are elastically supported at the lower part of the frame 2, and a fuel tank attached to the upper part of the frame 2. 5 and a control unit 53 for the engine 3 and the generator 4.

  As shown in FIGS. 1 to 3 and 8, the frame 2 is bent horizontally after a bottom frame 2a formed by bending a steel pipe in a U-shape and a steel pipe connected to both ends of the bottom frame 2a. Thus, it is composed of left and right side frames 2b and 2b that are formed in a U shape in cooperation with the left and right sides of the bottom frame 2a.

  The bottom frame 2a is provided with a plurality of lower cross members 7, 7... That connect the left and right sides, and an intermediate cross member that connects the upper sides of the vertical sides of the side frames 2b, 2b. 8 is provided, and an upper cross member 8 'for connecting the inclined corners above the two side frames 2b, 2b is provided. The intermediate cross member 8 has a longitudinal intermediate portion protruding outward from the side frames 2b and 2b so as to serve as a bumper. On the upper sides of the left and right side frames 2b, 2b, a hanger member 9 is provided for connecting the intermediate portions of the left and right side frames 2b, 2b. Thus, the frame 2 is configured in a frame shape with an open periphery.

  In the engine-driven generator 1, the open side of the U-shaped side frames 2b, 2b is the front side, and the closed side of the same side frames 2b, 2b, that is, the intermediate cross member 8 side is the rear side.

  6 to 8, the two cross members 7, 7 out of the lower cross members 7, 7... Have two pairs of left and right front and rear support plates 10, 10; 11; It is attached via 11,11. The left and right side frames 2b and 2b are provided with a pair of left and right and two pairs of upper and lower brackets 12 and 12; Reinforcing stays 14, 14 extending forward from the upper end of the vertical side of each corresponding side frame 2b are coupled to the lower part. A pair of left and right bracket pieces 16, 16 are provided at the front ends of the reinforcing stays 14, 14.

  Each of the pair of left and right support plates 10, 10; 10, 10 is connected to connecting plates 15, 15 for connecting them to each other by bolts, and the connecting plate 15, 15 is connected to the bottom wall of the engine 3 The bottom wall of a duct member 31 to be described later is coupled by a bolt 33. Thus, the assembly of the engine 3 and the generator 4 is elastically supported by the frame 2.

  9 to 11, a duct member 31 that defines a series of cooling air passages 32 between the engine 3 and the generator 4 while surrounding the cooling fan 26 is arranged on the outer periphery of the engine 3 and the generator 4. In the cooling air passage 32, the cooling air flows from the upstream end on the cooling fan 26 side toward the downstream end on the rear surface side of the engine 3 by the rotation of the cooling fan 26. The duct member 31 is divided into a plurality of parts in order to facilitate the manufacture thereof, and the appropriate position is bolted to the outer peripheral surface of the engine 3.

  As shown in FIGS. 3 and 9, the engine 3 is a four-cycle type, and the crankshaft 17 is arranged in the front-rear direction of the engine-driven generator 1, and the cylinder portion 19 accommodates the crankshaft 17. , Projecting obliquely upward from one side of the supporting crankcase 18, and intake and exhaust ports are opened on the front and rear surfaces of the cylinder portion 19, respectively.

  The generator 4 includes a stator 22 fixed to the front end surface of the crankcase 18 with a plurality of bolts 21 and including a plurality of stator coils 22a, and a front end of the crankshaft 17 that extends forward through the front end wall of the crankcase 18. The outer rotor 23 is fixedly attached to the inner peripheral surface and arranged with a plurality of permanent magnets 23a arranged on the inner peripheral surface thereof, that is, an outer rotor type multipolar magnet generator. The outer rotor 23 includes a hub 23 b surrounded by the stator 22. The hub 23 b is taper-fitted to the end of the crankshaft 17 and is fixed to the end of the crankshaft 17 by a key 24 and a nut 25. The Thus, the outer rotor 23 is cantilevered on the crankshaft 17.

  A centrifugal cooling fan 26 having a larger diameter and corresponding to the inner diameter of the duct member 31 and a recoil starter 27 projecting forward of the cooling fan 26 are attached to the outer end surface of the outer rotor 23.

  As shown in FIGS. 6 and 9, a ring gear 28 is fixed to the rear end portion of the crankshaft 17, and a starter motor 30 that drives the ring gear 28 via a pinion 29 and an overrunning clutch (not shown) is cranked. It is attached to the upper part of the case 18.

1 to 5 and 8 to 11, a square intake box 34 that forms the outline of the front surface of the engine-driven generator 4 in a front view is disposed at the front portion of the frame 2. The intake box 34 is composed of a synthetic resin box body 36 whose rear surface is opened and a steel plate end plate 37 which is coupled to the box body 36 so as to close the rear surface of the intake box. As the reinforcing members of the frame 2, the four corners are fixed to the brackets 12 and 13 by a plurality of bolts 35 so as to be separable, and the box body 36 is separably bolted to an end plate 37.

  As described above, the frame 2 includes a single U-shaped bottom frame 2a and a pair of left and right side frames 2b and 2b sharing the left and right sides of the bottom frame 2a. Since the two frames 2b and 2b are connected by a plurality of cross members 7, 8, 8 ', the structure is very simple, and the frame 2 can be attached to and detached from the opened front end. The frame 2 can be reduced in weight by being reinforced by the intake box 34 connected to the frame.

  Further, if the intake box 34 is removed from the frame 2, the engine 3 and the generator 4 can be detached from the front side of the frame 2 opened thereby, and maintenance thereof can be performed easily.

  A first intake louver 38 a is provided on the front surface of the box body 36, and the end plate 37 has a second intake louver 38 b, a large-diameter first connection port 39 adjacent to the upstream end of the duct member 31, and a small-diameter A second connection port 40 is provided, and an annular first seal member 41 made of an elastic material such as rubber is attached to the periphery of the first connection port 39, and the first seal member 41 is annular and flexible. A highly sealing lip 41 a is fitted on the outer periphery of the duct member 31 in an airtight manner. The first seal member 41 communicates between the intake box 34 and the duct member 31 while allowing relative displacement between the duct member 31 and the intake box 34 due to elastic deformation of the seal lip 41a. The upstream end of the duct member 31 is constituted by a starter cover 31a, which will be described later, so as to enter the intake box 34, and a plurality of ventilation holes 116a, 116b are provided in the end wall and the peripheral wall of the starter cover 31a. (See FIG. 20). The intake box 34 has a cross-sectional area larger than the total opening area of the vent holes 116a and 116b, and constitutes a muffled expansion chamber.

  9 and 20, the recoil starter 27 includes a cup-shaped driven member 111 fixed to the outer end surface of the outer rotor 23, and a bowl-shaped starter coupled to the upstream end of the duct member 31 so as to cover it. A cover 31a, a rope pulley 114 rotatably supported on the inner wall of the starter cover 31a and wound with a starter rope 113, and a rope pulley 114 provided between the rope pulley 114 and the driven member 111 and pulled by the starter rope 113. Only during forward rotation, the rope pulley 114 and the one-way clutch 115 that connects the driven member 111 are provided, and the rope pulley 114 is urged in the reverse direction by a return spring (not shown). A number of ventilation holes 112 are formed in the rope pulley 114 so that the rope pulley 114 does not hinder the flow of cooling air in the duct member 31.

  The starter rope 113 is pulled out of the intake box 34 through grommet-shaped rope guides 118 and 119 provided on the side walls of the starter cover 31a and the intake box 34, respectively, and an operation knob 117 is connected to the outer ends thereof. The operation knob 117 is supported at the outer end of the outer rope guide 119 in its retracted position.

  In this way, the outer portion of the intake box 34 where the operation knob 117 of the recoil starter 27 is disposed hits the substantially outermost portion of the engine-driven generator 1, so that the pulling operation of the operation knob 117 is interfered with other objects. It can be done easily and has good startability.

  1 and 10 to 12, a carburetor 44 is attached to the front surface of the cylinder portion 19 of the engine 3. The vaporizer 44 penetrates the side wall of the duct member 31 and is exposed to the outside of the duct member 31, and an air cleaner 45 disposed also outside the duct member 31 has an elastic communication tube 46 made of an elastic material such as rubber. To the inlet of the carburetor 44 through the intake passage. Further, the high tension cord 43 connected to the ignition plug of the engine 3 is also pulled out through the side wall of the duct member 31.

  As shown in FIG. 1, the air cleaner 45 has a substantially rectangular shape that is long in the axial direction of the crankshaft 17 of the engine 3 in a side view, and at least a part of the air cleaner 45 is tilted slightly upward on one side of the crankcase 18. It arrange | positions so that it may come under the cylinder part 19 made. By doing so, it is possible to install a relatively large capacity air cleaner 45 while lowering the center of gravity of the engine-driven generator 1.

  As clearly shown in FIGS. 11 and 12, the air cleaner 45 is fixed to the outer surface of the duct member 31 with bolts 50 so as to open the outer surface, and the open surface of the cleaner case 47 is closed. The case 51 includes a case cover 48 coupled to the cleaner case 47 with bolts 51 and a cleaner element 49 sandwiched between the cleaner case 47 and the case cover 48. The cleaner case 47 is disposed on the unpurified surface side of the cleaner element 49. An air inlet pipe 47a that communicates is integrally formed.

  An annular second seal member 42 made of an elastic material such as rubber is attached to the peripheral edge of the second connection port 40, and the annular and flexible seal lip 42 a of the second seal member 42 is an air cleaner 45. The outer periphery of the 47a is fitted. The second seal member 42 allows relative displacement between the duct member 31 elastically supported by the frame 2 via the engine 3 and the intake box 34 fixedly supported by the frame 2 by elastic deformation of the seal lip 42a. The intake box 34 and the air cleaner 45 are communicated with each other.

  3, 5, and 9, the intake box 34 is provided with an operation window 52 at an upper front portion thereof, and is disposed above the first connection port 39 in the intake box 34. The operation panel 53 a of the control unit 53 for the machine 4 faces the operation window 52. The control panel 53 a is fixed to the inner surface of the rear wall of the intake box 34 with bolts 54.

  In the intake box 34, the control unit 53 and the inverter 55 are installed between the first intake louver 38a and the first connection port 39, and the battery 61 is installed between the first intake louver 38a and the second connection port 40. . In particular, an upstream end portion of the duct member 31 that is disposed so as to protrude into the intake box 34 from the first connection hole 39, that is, a starter cover 31 a is disposed close to the back surface of the inverter 55.

  The inverter 55 (see FIG. 5 in particular) supports a plurality of support shafts 56 projecting from the lower end surface of the inverter 55 on the bottom wall of the intake box 34 via a grommet 57 and intakes a plurality of ear pieces 58 at the upper end. The end plate 37 of the box 34 is attached to the intake box 34 by being connected with bolts 59. At this time, a sufficient ventilation gap is provided around the inverter 55 so as not to disturb the air flow from the first and second intake louvers 38a, 38b to the first and second connection ports 39, 40.

  The battery 61 is held on the end plate 37 by a rubber band 62. At that time, a sufficient ventilation gap is provided around the battery 61 so as not to hinder the flow of air from the first and second intake louvers 38a, 38b to the second connection port 40. In order to check the battery 61, a check window 64 (see FIG. 8) that can be closed with a lid 63 is provided on the front wall of the intake box 34.

  As clearly shown in FIG. 9, a mounting flange 67 is formed at the downstream end of the duct member 31, and an exhaust box 68 is attached to the mounting flange 67. The exhaust box 68 includes a box body 68 having an exhaust louver 73 on the upper rear surface and an open front surface, and an end plate 70 joined to the flange portion 68a of the box body 69 so as to close the open surface. The end plate 70 and the flange portion 68 a are fixed to the mounting flange 67 with a plurality of bolts 71. The end plate 70 of the exhaust box 68 is formed with large and small through holes 72 and 75 (see FIG. 7), and the downstream end of the duct member 31 and the inside of the exhaust box 68 communicate with each other through the through holes 72 and 75. The The exhaust box 68 has a cross-sectional area sufficiently larger than the opening area of the through holes 72 and 75 and constitutes a muffled expansion chamber.

  An exhaust muffler 74 attached to the rear surface of the cylinder portion 19 of the engine 3 and an outlet pipe 74 a of the exhaust muffler 74 are accommodated in the exhaust box 68, and the end of the outlet pipe 74 a extends from an exhaust louver 73 of the exhaust box 68. Open far away. A sufficient ventilation gap is provided around the exhaust muffler 74 to allow the flow of cooling air from the through holes 72 and 75 to the exhaust louver 73.

  As shown in FIGS. 1, 7, 9, 13, and 14, the fuel tank 5 having a filler cap 5 a on the upper wall is arranged on the upper portion of the duct member 31 that covers the engine 3 and the generator 4. Established. The fuel tank 5 has a substantially square shape in plan view, and covers the entire upper surface of the duct member 31 over its entire length. The four corners of the mounting flange 77 projecting from the outer periphery of the fuel tank 5 Are attached to the upper cross member 8 ′ and bracket pieces 16, 16 of the frame 2 by bolts 79 together with the elastic members 78, 78 ′ arranged above and below. Thus, the fuel tank 5 is elastically supported by the frame 2.

  In particular, in FIG. 13 and FIG. 14, the upper cross member 8 ′ of the frame 2 that supports the rear end portion of the mounting flange 77 of the fuel tank 5 faces a bent edge 77 a that is bent below the mounting flange 77. The both ends of the flange 80 communicate with the outer peripheral surfaces of the vertical sides of the left and right side frames 2b, 2b through the outflow holes 81. The outflow hole 81 is formed in a cutout shape in the welded portion of the cross member 8 'to the left and right side frames 2b, 2b. A slope 5b is formed on the upper surface of the fuel tank 5 so as to reach the down mounting flange 77 toward the flange 80 side.

  Thus, at the time of refueling the fuel tank 5, if the fuel overflowing from the refueling port to the upper surface of the fuel tank 5 flows backward, the fuel flows down the slope 5b and reaches the mounting flange 77. , And is guided to the bent edge 77a downward of the flange 77 and surely flows down to the flange 80, flows through the flange 80, and flows from the left and right outflow holes 81 to the left and right side frames 2b and 2b. It flows down along the outer periphery and falls outside the machine.

  Therefore, as shown in the figure, even if the exhaust box 68 or the like, such as the exhaust box 68, is disposed below the saddle 80, it is not contaminated by the overflow fuel. Can greatly expand the degree of freedom.

  Further, since the flange 80 is formed by using the cross member 8 'which is a reinforcing member of the frame 2, the structure can be simplified, and the outlet 81 is notched at both ends of the cross member 8'. As a result, the strength of the frame 2 can be prevented from being lowered.

  The duct member 31, the exhaust box 68 and the fuel tank 5 are disposed in the frame-type frame 2.

  Thus, when the engine 3 is operated, the generator 4 is driven by the rotating crankshaft 17 to generate power, and the output is controlled by the inverter 55 and the control unit 53 and then on the operation panel 53a. Removed from the outlet.

  The cooling fan 26 that is rotationally driven by the crankshaft 17 draws the outside air as cooling air into the intake box 34 from the first and second intake louvers 38a and 38b, and the inside of the duct member 31 from the upstream end to the downstream end. Then, the air is discharged from the exhaust louver 73 through the exhaust box 68. Due to the flow of such cooling air, the control unit 53 and the inverter 55 are cooled in the intake box 34, the engine 3 and the generator 4 are cooled in the duct member 31, and the exhaust muffler 74 is cooled in the exhaust box 68. Is done.

  In particular, the upstream end portion of the duct member 31, that is, the starter cover 31 a having the ventilation holes 116 a and 116 b is disposed close to the back surface of the inverter 55 in the intake box 34, so that the air around the inverter 55 is effective for the duct member 31. Thus, the inverter 55 that is likely to become relatively hot can be effectively cooled.

  Further, the exhaust gas discharged from the outlet pipe 74a of the exhaust muffler 74 can be mixed with the cooling air in the exhaust box 68 to lower the exhaust temperature, and at the same time, the exhaust noise can be effectively reduced.

  In addition, the cooling fan 26 having a large diameter corresponding to the inner diameter of the duct member 31 can be easily mounted using the wide outer end surface of the outer rotor 23 that is cantilevered by the crankshaft 17. The cooling effect of the generator 4 can be enhanced.

  During operation of the engine 3 and the generator 4, these and the operating noise generated by the cooling fan 26 are blocked by the duct member 31. That is, the duct member 31 serves as a sound barrier for the engine 3, the generator 4 and the cooling fan 26. Even if the operating noise is transmitted from the upstream end and the downstream end of the duct member 31 to the intake box 34 and the exhaust box 68, the operation noise is effectively silenced by the expansion and silencing action of the intake box 34 and the exhaust box 68. It is possible to prevent leakage of operating noise to the outside as much as possible. In particular, in the intake box 34, since the control unit 53 and the inverter 55 are disposed between the first connection port 39 and the first intake louver 38a, the control unit 53 and the inverter 55 are connected to the first connection port 39 and the first intake louver. It becomes a sound insulation partition between 38a, can prevent the leakage of noise to the outside, and can enhance the silencing effect of the intake box 34. Thus, the quietness of the engine driven generator 1 is ensured.

  Further, the fuel tank 5 covers the upper surface of the duct member 31 over the entire length thereof, and in cooperation with the duct member 31, forms a double soundproof wall for the engine 3 and the generator 4. The operating noise of the generator 4 can be effectively prevented from leaking upward, and the quietness of the engine-driven generator 1 can be further enhanced with a simple structure.

  Moreover, since the relatively large fuel tank 5 is attached to the upper part of the left and right side frames 2b, 2b as described above, it can be easily attached and detached, and the frame 2 is similar to the intake box 34. Since the fuel tank 5 and the intake box 34 are removed, the upper surface and the front surface of the frame 2 can be opened and the engine 3 and the generator 4 can be easily attached and detached. Can be improved.

  Further, during the intake stroke of the engine 3, the air in the intake box 34 is sucked into the engine 3 through the air cleaner 45 and the carburetor 44, so that the intake noise of the engine 3 can be effectively silenced by the intake box 34. In particular, the battery 61 in the intake box 34 serves as a sound insulation partition between the second connection port 40 and the first intake louver 38a, thereby preventing leakage of intake noise to the outside and further enhancing the silencing effect of the intake box 34. it can.

  Thus, the operating noise of the engine 3, the generator 4 and the cooling fan 26 can be easily reduced by the duct member 31 covering the engine 3 and the generator 4 and the intake and exhaust boxes 34, 68 connected to the upstream and downstream ends thereof. The duct member 31 and the intake and exhaust boxes 34 and 68 are disposed in the open frame 2 so that the entire engine-driven generator is covered with a soundproof wall. The engine-driven generator 1 can be made more compact and lighter than the conventional one. In addition, since the vaporizer 44 and the air cleaner 45 are disposed outside the duct member 31, these maintenance operations can be performed easily and quickly.

  Such vibration during operation of the engine 3 is absorbed by elastic deformation of the elastic members 11, 11; 11, 11 interposed between the engine 3 and the frame 2, thereby preventing vibration from being transmitted to the frame 2 or remarkably. Can be reduced.

  Incidentally, the duct member 31 and the air cleaner 45 are fixed to the engine 3 and vibrate together with the engine 3. However, since the intake box 34 is fixed to the frame 2, the engine 3 and the generator 4 During operation, relative displacement due to vibration of the engine 3 occurs between the duct member 31 and the air cleaner 45 and the intake box 34. However, the first and second connection ports 39 and 40 of the intake box 34 are connected to the duct member 31 and the air cleaner 45 via the flexible first and second seal members 41 and 42. The first and second seal members 41 and 42 are allowed to be deflected to allow relative displacement due to vibrations between the duct member 31 and the air cleaner 45 and the intake box 34, thereby allowing the cooling air to flow from the intake box 34 to the duct member 31. It can be performed efficiently without leakage.

  As shown in FIGS. 3 and 9, a pair of left and right wheels 83, 83 are pivotally supported on the bottom frame 2a of the frame 2 on the rear side, that is, on the exhaust box 68 side, and on the front side, that is, on the intake box 34 side. Thus, a pair of left and right grounding legs 84, 84 are fixed.

  1 and 15-19, a pair of left and right handle brackets 87, 87 are fastened to the upper brackets 12, 12 at the front end of the frame 2 together with an end plate 37 and a bolt 35 of the intake box 34, and these handle brackets. 87 and 87 project outside through a pair of left and right slits 76 and 76 (see FIG. 8) provided in the box body 36 of the intake box 34, and the engine-driven generator 1 is moved to these projecting portions. A moving handle 86 is attached for use. The moving handle 86 is welded to a pair of left and right handlebars 88, 88, a cross member 89 that interconnects the intermediate portions of the handlebars 88, 88, the handlebars 88, 88, and their base ends. It comprises an L-shaped support substrate 92 that is bolted to the connecting plate 90, and rubber handle grips 93 that are fitted to the front ends of the handle bars 88, 88. Are connected to the left and right handle brackets 87, 87 via horizontal pivot bolts 94, 94, respectively, and the moving handle 86 has a use position A in which both handle bars 88, 88 are leveled and a handle grip 93 vertically. It is possible to rotate between the storage position B facing downward. A disc spring 95 is provided between the head of the pivot bolt 94 and the support substrate 92 to give an appropriate rotational resistance to the moving handle 86.

  The use position A of the moving handle 86 is defined by the stopper 96 formed on the connecting plate 90 and the support substrate 92 coming into contact with the front end surface of the handle bracket 87, and the storage position B is determined by the handle grip 93 being attached to the frame 2. The bottom frame 2a is defined by coming into contact with the front side portion protruding forward from the intake box 34.

  The support substrate 92 is provided with a damper 97 that operates immediately before the stopper 96 contacts the handle bracket 87 when the moving handle 86 is rotated from the storage position B to the use position A. That is, the damper 97 has a support shaft 98 protruding integrally on the inner wall of the support substrate 92, a cushion member 99 made of rubber fitted on the outer periphery of the support shaft 98, and fitted on the outer periphery of the cushion member 99. The bush 100 is brought into contact with the bracket 87 immediately before the stopper 96 comes into contact with the front end surface of the handle bracket 87, and the cushion member 99 is elastically deformed. Absorbs dynamic shock.

  Further, the moving handle 86 and the handle bracket 87 are provided with a lock mechanism 101 for locking the moving handle 86 to the use position A. The lock mechanism 101 is supported by pivots 102, 102 fixed between the left and right connecting plates 90, 90 and the support substrates 92, 92, and can rotate between a lock position L and an unlock position U. Lever 103 is provided. Each operation lever 103 is provided with a lock pin 105, and a lock groove 106 is provided at the upper edge of the handle bracket 87. At the use position A of the movement handle 86, the operation lever 103 is moved to the lock position L and the unlock position. The lock pin 105 engages and disengages from the lock groove 106 as it rotates to the lock position U. A lock spring 107 that biases the operation lever 103 in the direction of the lock position L is provided between the operation lever 103 and the support substrate 92 in a contracted manner. The handle bracket 87 is formed with an arcuate surface 87a that guides the engagement of the lock pin 105 with the lock groove 106 from the front end surface to the upper edge portion.

  Thus, when the moving handle 86 is rotated from the storage position B to the use position A around the pivot bolt 94 and the lock pin 105 reaches the lock groove 106 while being guided by the arc surface 87a, the lock spring 107 is moved. The operating lever 103 is rotated to the lock position L by the urging force, and the lock pin 105 is engaged with the lock groove 106. Thus, the moving handle 86 is locked at the horizontal use position A.

  If the left and right grips 93, 93 of the moving handle 86 are gripped and pulled up, and the moving handle 86 is pushed and pulled while the grounding legs 84, 84 are lifted, the wheels 83, 83 are rotated to drive the engine. The generator 1 can be moved easily.

  While the moving handle 86 is being used, the hand may be released, and the handle 86 continues to be locked by the lock mechanism 101, so that the handle 86 is prevented from rotating to the storage position B due to its own weight. The operability of the handle 86 is good.

  When the moving handle 86 is rotated to the use position A, the cushion member 99 of the damper 97 comes into contact with the handle bracket 87 via the bush 100 and elastically deforms immediately before the stopper 96 contacts the handle bracket 87. Since the rotational shock of the moving handle 86 can be absorbed, and the elastic deformation of the cushion member 99 is maintained even after the handle 86 is locked at the use position A by the lock mechanism 101, the repulsion is prevented. The backlash of the lock mechanism 101 can be prevented by the force. Furthermore, since the cushion member 99 is prevented from direct contact with the handle bracket 87 by the bush 100 covering the outer periphery thereof, the durability of the cushion member 99 can be enhanced.

  After the movement, if the operating lever 103 is rotated to the unlock position U against the urging force of the lock spring 107 and the lock pin 105 is detached from the lock groove 106, the moving handle 86 is pivoted. The rotation around the bolt 94 is free. Therefore, the handle 86 can be rotated to the storage position B in the vertical posture.

  At this time, since the left and right handle grips 93, 93 of the moving handle 86 abut against the bottom frame 2a of the frame 2, the left and right handlebars 88, 88 and the cross member 89 are disposed on the front surface of the intake box 34, and are controlled. Together with the unit 53, the inverter 55, and the battery 61, it functions as a strong bumper that protects the intake box 34 from contact with other objects.

  In the state where the moving handle 86 is folded to the storage position B as described above, the operation by the engine driven generator 1 can be easily performed without being obstructed by the moving handle 86, and the engine driven type When storing the generator 1 in a warehouse or the like, a relatively small storage space is sufficient.

  In addition, since the handle 86 functions as a bumper, the intake box 34 is effective by the moving handle 86 rotated to the storage position and the bottom frame 2a of the frame 2 without providing a special guard frame in the intake box 34. Therefore, the box body 36 of the large intake box 34 that accommodates the control unit 53, the inverter 55, and the battery 61 can be made of a synthetic resin to reduce its weight.

  The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention.

  For example, the air cleaner 45 is fixedly supported on the frame 2 in the same manner as the intake box 34, and the relative displacement between the carburetor 44 and the air cleaner 45 due to the vibration of the engine 3 is elastically communicated between the carburetor 44 and the air cleaner 45. It is possible to absorb the bending of the communication tube 46, and in this case, the air inlet pipe 47 a of the air cleaner 45 can be integrally connected to the intake box 34.

Incidentally, the outlet pipe of the exhaust muffler 74, as in the reference example shown by reference numeral 74a 'in FIG. 9, when the opening to the outside by penetrating the outer璧exhaust box 68, the cooling from the exhaust louver 73 of the exhaust box 68 Only the wind is discharged.

1 is a side view of an engine driven generator according to the present invention, showing a moving handle in use. The top view of the engine drive type generator. The front view of the engine drive type generator. FIG. 3 is a front view of the engine-driven generator when the moving handle is in a retracted state. The front view of the engine drive generator shown in the state which removed the box main body of the intake box. The rear view of the engine drive type generator. The rear view of the engine drive type generator which cut | disconnects and shows a part of exhaust box. The disassembled perspective view of a part of the engine-driven generator. FIG. 9 is a sectional view taken along line 9-9 in FIG. 3. FIG. 10 is a sectional view taken along line 10-10 in FIG. 3; FIG. 11 is a sectional view taken along line 11-11 in FIG. 3; 12-12 sectional view taken on the line of FIG. FIG. 13 is a sectional view taken along line 13-13 in FIG. 2; FIG. 14 is a sectional view taken along line 14-14 of FIG. The enlarged view of the handle part for a movement of FIG. FIG. 16 is a sectional view taken along line 16-16 in FIG. 15; FIG. 17 is a cross-sectional view taken along line 17-17 in FIG. FIG. 18 is a sectional view taken along line 18-18 in FIG. 15; FIG. 19 is a sectional view taken along line 19-19 in FIG. 15; FIG. 20 is a sectional view taken along line 20-20 in FIG. 9;

Explanation of symbols

1 ... Engine-driven generator 2 ... Frame
2a ... U-shaped bottom frame
2b ... U-shaped side frame 3 ... Engine 4 ... Generator 5 ... Fuel tank 17 ... Crankshaft 23 ... Outer rotor 26 ... .... Cooling fan 31 ... Duct member 32 ... Cooling air passage 34 ... Intake box 38a, 38b ... Intake port (first and second intake louvers)
41... Seal member (first seal member)
44... Intake amount control device (vaporizer)
45 ... Air cleaner 53 ... Electrical components (control unit)
55 .. Electrical components (inverters)
68 ... Exhaust box 73 ... Exhaust port (exhaust louver)
74 ... ・ Exhaust muffler
74a ... outlet pipe

Claims (6)

In an engine-driven generator configured to support an engine (3) and a generator (4) driven by the engine (3) on a frame (2),
The frame has a U-shaped bottom frame (2a) and a pair of U-shaped left and right side frames (2b, 2b) sharing the left and right sides of the bottom frame (2a) . A frame-type frame (2) is formed, and a series of cooling air passages (32) are defined between the outer periphery of the engine (3) and the generator (4) in the frame-type frame (2). A duct member (31) is disposed, and is driven by the engine (3) in the cooling air passage (32) to be connected to the downstream end from the upstream end side of the duct member (31) in the cooling air passage (32). A cooling fan (26) for generating cooling air directed toward the side is provided, and the upstream end of the duct member (31) has an intake port (38) at the outer end to accommodate electrical components (53, 55). connect the intake box (34), four corners of the U-shaped side frames of the intake box (34) (2 , And detachably connected to each end of the open side of 2b) to reinforce the frame (2) the frame type, and the other end of the duct member (31), the upper outer end outlet (73 ) And an exhaust box (68) for accommodating the exhaust muffler (74) of the engine (3) is connected to the exhaust box (68) at a lower portion away from the exhaust port (73). An engine-driven generator, wherein an end of an outlet pipe (74a) of the muffler (74) is opened . The engine-driven generator according to claim 1,
An engine-driven generator, characterized in that the intake box (34) and the exhaust box (68) are configured in an expansion and silencing chamber. The engine-driven generator according to claim 2,
An engine-driven generator according to claim 1, wherein a fuel tank (5) covering the upper surface of the duct member (31) is provided over the entire length of the duct member (31). The engine-driven generator according to claim 1 or 2,
The assembly of the engine (3) and the generator (4) is elastically supported by the frame (2), and the duct member (31) is fixedly supported by the assembly, while the intake box (34) is Engine drive type, characterized in that it is fixedly supported on a frame (2) and the duct member (31) and the intake box (34) are connected via a seal member (41) allowing their relative displacement. Generator. The engine-driven generator according to any one of claims 1 to 4,
The generator (4) is constituted by a magnet generator (4) including an outer rotor (23) that is cantilevered by a crankshaft (17) of the engine (3), and is formed on an outer end surface of the outer rotor (23). An engine-driven generator, wherein the cooling fan (26) is attached. The engine-driven generator according to claim 1,
An intake air amount control device (44) of the engine (3) and an air cleaner (45) for purifying the intake air are disposed outside the duct member (31), and an air inlet of the air cleaner (45) is provided in the intake box. An engine-driven generator characterized by being connected to (34).

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