JP2006009809A - Engine working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the maintenance of a valve system inside a head cover or the like by surely supporting the weight of an engine and a working machine in carrying them using a carrying handle while a case for the engine working machine is reduced in weight and increased in degree of freedom in design and by allowing a head cover to be attached/detached from the outside of the shroud while a shroud for covering a cylinder block and cylinder head of engine is mounted. <P>SOLUTION: A head cover 51 for covering a cylinder block 49 and a cylinder head 50 of engine E with a shroud 66 equipped with the engine E and connected to the cylinder head 50 is exposed from the upper part of the shroud 66 provided to the engine E and formed so as to be freely attachable/detachable to the cylinder head 50 from outside of the shroud 66. The head cover 51 is fixed to a carrying handle 17 of a case 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a portable engine work machine in which an engine and a work machine driven by the engine are housed in a sound insulation case having a carrying handle.

  In such a portable engine working machine, the engine and the working machine are accommodated in a case made of synthetic resin, and a carrying handle provided at the upper part of the case is held and carried. When the engine working machine is lifted by grasping the carrying handle, the weight of the heavy engine and working machine is added to the bottom of the case. Therefore, it is necessary to provide the case with sufficient rigidity to prevent deformation. However, if the rigidity of the case itself is increased, not only the weight of the case increases and the entire engine working machine becomes heavy, but also the design freedom of the shape and material of the case is limited.

Therefore, a solid frame is formed by connecting the upper and lower portions of the pair of front and rear loop frames with a carrying handle and a bottom cover, respectively, and the frame is covered by supporting the engine and work implement on this frame. The following patent document proposes a cover in which no load is applied.
Japanese Patent Publication No. 1-213999

      However, in order to support the weight of the engine and the work machine, it is necessary to provide sufficient rigidity to the front and rear frame bodies, the carrying handle, and the bottom cover that constitute the frame, and the weight is sufficiently reduced. In addition to being difficult to achieve, there is a problem that the degree of freedom in design is reduced because the shape and material of the frame are restricted.

  The present invention has been made in view of the above-described circumstances, and reliably supports the weight of the engine and the work machine during transportation using the carrying handle while reducing the weight of the case of the engine work machine and increasing the degree of design freedom. In addition, the head cover can be attached and detached from the outside of the shroud while the shroud covering the cylinder block and cylinder head of the engine is attached to the engine so that maintenance of the valve mechanism inside the head cover can be easily performed. The purpose is to do.

  In order to achieve the above object, according to the first aspect of the present invention, an engine having a shroud for guiding cooling air inside a case having a carrying handle at an upper portion thereof, and the engine is integrally connected to the engine. In the engine working machine storing the working machine driven by the engine, a cylinder block and a cylinder head of the engine are covered with a shroud attached to the engine, and a head cover coupled to the cylinder head is attached from an upper part of the shroud attached to the engine. An engine working machine is proposed which is exposed and configured to be detachable from the cylinder head from the outside of the shroud, and the head cover is fixed to the carrying handle of the case.

  In addition, the generator G of an Example respond | corresponds to the working machine of this invention.

  According to the second aspect of the present invention, in addition to the structure of the first aspect, the support portion formed integrally with the head cover is fixed to the carrying handle of the case via the vibration isolating member. An engine work machine is proposed.

  In addition, the rubber bush 85 of an Example respond | corresponds to the vibration isolator of this invention.

  According to the invention described in claim 3, in addition to the structure of claim 1 or 2, the air guide plate that forms the air guide path in cooperation with the shroud is formed integrally with the head cover. An engine working machine is proposed in which an ignition plug attachment / detachment opening for attaching / detaching an engine ignition plug is formed on a plate.

  According to the invention described in claim 4, in addition to the structure of any one of claims 1 to 3, the working machine is a generator, and is introduced into the case by a cooling fan provided in the generator. An engine working machine is proposed in which the cooling air cools the generator, the engine, and the muffler and is discharged out of the case.

  As described above, according to the present invention, since the engine head cover exposed from the shroud covering the cylinder block and cylinder head of the engine is fixed to the carrying handle of the case, the weight of the engine and the work implement is increased when the carrying handle is lifted. It is directly supported by the carrying handle without acting on the case, so that it is not only necessary to reinforce the case and reduce the weight, but also the design flexibility of the shape and material of the case increases. Moreover, since the engine head cover exposed from the upper part of the shroud is fixed to the carrying handle, the vertical dimension of the engine working machine can be reduced without being obstructed by the shroud. Further, since the head cover can be attached and detached from the outside of the shroud while the shroud is mounted on the engine, maintenance of the valve operating mechanism and the like inside the head cover can be easily performed.

  In particular, according to the second aspect of the present invention, since the support portion integrated with the head cover is fixed to the carrying handle via the vibration isolating member, the vibration of the engine transmitted to the carrying handle can be reduced.

  In particular, according to the invention of claim 3, since the air guide plate constituting the air guide path is integrally formed on the head cover in cooperation with the shroud, the flow of the cooling air in the shroud can be made smooth. In addition, since the spark plug attaching / detaching port is formed in the air guide plate, the attaching / detaching operation of the spark plug can be easily performed with the shroud attached.

  In particular, according to the invention of claim 4, when the generator is driven by the engine, the cooling fan provided in the generator rotates, and the cooling air introduced into the case cools the generator, the engine, and the muffler. Since it is discharged outside, it is possible to cool the generator, engine, and muffler that are the ventilation in the case and the heating element with a single cooling fan. In addition, since the engine is doubly covered by the shroud and the case, it is possible to effectively reduce engine noise and air noise.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on examples of the present invention illustrated in the accompanying drawings.

  1 to 13 show an embodiment of the present invention. FIG. 1 is an overall side view of an engine generator, FIG. 2 is a view taken along line 2-2 in FIG. 1, and FIG. 3 is a sectional view taken along line 4-4 of FIG. 2, FIG. 5 is a sectional view taken along line 5-5 of FIG. 3, FIG. 6 is a view taken along arrow 6 in FIG. 3, and FIG. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 3, FIG. 9 is a view taken in the direction of arrow 9 in FIG. 3, FIG. 10 is an enlarged view of 10 parts in FIG. FIG. 12 is a cross-sectional view taken along line -11, FIG. 12 is an enlarged view of a portion 12 in FIG. 5, and FIG. 13 is an exploded perspective view of the engine generator.

As shown in FIGS. 1 to 4 and FIG. 13, a synthetic resin case 11 that forms an outline of an engine generator that generates power by driving a generator G with an engine E includes a left side cover 12 and a right side cover. 13, a front cover 14, a rear cover 15 and an under cover 16. A carrying handle 17 for carrying the engine generator is provided on the upper part of the left side cover 12 and the right side cover 13 which are integrally joined, and reinforcing ribs 17 ₁ ... Are provided inside the carrying handle 17. It is formed in a lattice shape (see FIGS. 3 and 4). The left side cover 12 is formed with a spark plug replacement lid 12 ₁ and a slit-shaped cooling air inlet 12 ₃ ..., And the right side cover 13 is formed with a maintenance lid 13 ₁ . The front cover 14 is provided with an operation panel 18, a control unit 19 provided at the rear of the operation panel 18 to control the operation of the engine E and the generator G, and an output frequency of the generator G provided at the rear of the control unit 19. And an inverter unit 20 for controlling. The rear cover 15 is provided with an exhaust gas discharge port 15 ₁ for discharging the exhaust gas of the engine E and a cooling air discharge port 15 _{2 for} discharging the cooling air from the case 11. The undercover 16 is provided with four rubber support legs 21 that come into contact with the ground or floor when the engine generator is installed.

  Since the operation panel 18, the control unit 19 and the inverter unit 20 constituting the control system of the engine generator are collectively arranged on the front cover 14, not only the length of the wire harness can be shortened but also the control can be performed only by removing the front cover 14. System maintenance can be performed at once.

The front portion of the case 11 is provided with a left reinforcing frame 26 and a right reinforcing frame 27 made of FRP each formed in an inverted L shape. Left reinforcing frame 26 fixed to the left side of the undercover 16 in the lower end bolt 28 rises upward and lateral directions inwardly along the inner surface of the left side cover 12, mounting portions 26 ₁ bent upward at its upper end is formed The The right reinforcing frame 27 whose lower end is fixed to the right side surface of the under cover 16 with a bolt 29 rises upward and inward in the left-right direction along the inner surface of the right side cover 13, and a mounting portion 27 _{1 that} is bent upward is formed at the upper end. Is done. The left reinforcing frame 26 and the right reinforcing frame 27 form a gate shape as a whole, and the overlapping mounting portions 26 ₁ and 27 ₁ are sandwiched between the left side cover 12 and the right side cover 13 at the front portion of the carrying handle 17. In this state, the bolt 30a inserted from the left side cover 12 side is screwed into the embedded nut 30b of the right side cover 13 and fastened together (see FIG. 8).

A rubber seal member 31 is attached to a portion where the upper surfaces of the left side cover 12, the right side cover 13, and the front cover 14 are combined, and a fuel filler port 32 ₁ of a fuel tank 32 disposed at the upper part of the inverter unit 20 The opening 31 ₁ of the seal member 31 passes through the opening 311 from below and is closed by a detachable cap 33. The protrusions 32 ₂ and 32 ₃ provided on the left and right side surfaces of the fuel tank 32 are loosely fitted to the fuel tank support portions 26 ₂ and 27 ₂ formed on the left and right reinforcing frames 26 and 27, respectively. Positioned so as not to shake. A rubber-made lower vibration isolating member 34 provided on the upper surface of the inverter unit 20 faces the lower surface of the fuel tank 32 with a small gap. When the fuel tank 32 supplied with fuel swells and deforms downward by weight, the lower surface of the fuel tank 32 comes into contact with the upper surface of the lower vibration isolation member 34, and the weight is supported by the inverter unit 20.

  Thus, since the fuel tank 32 is sandwiched and supported by the left side cover 12 and the right side cover 13 from the left and right, the left side cover 12 and the right side cover 13 are not required to be attached or detached. The fuel tank 32 can be attached and detached simply by separating the fuel tank. Moreover, since the fuel tank 32 is surrounded by the left and right reinforcing frames 26 and 27, it is possible to protect against an external impact. Since the left and right reinforcing frames 26 and 27 do not cover the entire engine generator, there is no significant increase in weight.

An electric fuel pump 35 for supplying the fuel in the fuel tank 32 to the engine E is provided on the upper inner surface of the right reinforcing frame 27, and a fuel cock for cutting off the fuel to be supplied to the engine E on the lower outer surface. 36 and an engine switch 42 are provided. Operating knob 36 ₁ for opening and closing the fuel cock 36 is exposed to the outside through the right side cover 13. As described above, since the fuel pump 35 and the fuel cock 36 are supported by using the right reinforcing frame 27, a special support member is not required, which can contribute to a reduction in the number of parts. In addition, since the fuel supply system such as the fuel tank 32, the fuel pump 35, and the fuel cock 36 is supported by the left and right reinforcing frames 26 and 27 instead of the left and right side frames 12 and 13, the fuel supply system is maintained. When doing so, the left and right side frames 12, 13 can be easily removed.

  In FIG. 4, 37 is a fuel tube for supplying fuel from the fuel tank 32 to the fuel cock 36, 38 is a fuel tube for supplying fuel from the fuel cock 36 to the fuel pump 35, and 39 is fuel from the fuel pump 35 to the carburetor 41. The fuel tube 40 is a tube for driving the fuel pump 35 by transmitting the pulsation of the crankcase internal pressure of the engine E to a diaphragm (not shown) in the fuel pump 35.

  Next, based on FIGS. 5-13, the structure of the electric power generation unit 46 which integrated the engine E and the generator G is demonstrated.

As is clear from FIG. 7, the four-cycle single-cylinder engine E in which the axis of the crankshaft 47 is disposed in the front-rear direction includes a crankcase 48, a cylinder block 49, a cylinder head 50, and a head cover 51. Crankcase 48 is coupled 2 is divided by bolts 52 ... back and forth division surface 48 ₁ which is 45 ° relative to the axis of the crankshaft 47, and the first half of the crankcase 48, a cylinder block 49, The cylinder head 50 is integrally formed. The head cover 51 is detachably coupled to the cylinder head 50 with four bolts 53.

The outer rotor type generator G provided in a cantilevered manner at the shaft end of the crankshaft 47 projecting forward from the crankcase 48 includes a stator comprising coils 54 fixed to the front surface of the crankcase 48, and a crankshaft. The rotor is composed of permanent magnets 56 that are fixed to the inner peripheral surface of the flywheel 55 fixed to 48 and that face the outer peripheral surface of the coils 54. A cooling fan 57 is coaxially fixed to the front surface of the flywheel 55. The carburetor 41 is disposed on the right side surface of the cylinder head 50 of the engine E, and an air cleaner 59 (see FIGS. 5 and 9) is connected to the front side of the carburetor 41 via an intake pipe 58. Further, a box-shaped muffler 61 connected to the rear end of the exhaust pipe 60 extending rearward from the left side surface of the cylinder head 50 of the engine E includes a rear surface of the engine E with three bolts 62, 62, 63 (see FIG. 6). Fixed to. An exhaust port 61 ₁ formed on the rear surface of the muffler 61 faces the exhaust gas discharge port 15 ₁ of the rear cover 15 (see FIG. 7).

  A shroud 66 made of a synthetic resin covering the periphery of the engine E is divided into a left shroud half 67 and a right shroud half 68, and the left shroud half 67 is a crankcase of the engine E with two bolts 69 and 69. 48 and the left side surface of the cylinder block 49 (see FIGS. 3 and 5), and the right shroud half 68 is fastened to the crankcase 48 of the engine E and the right side surface of the cylinder block 49 with two bolts 70 and 70. (See FIGS. 4 and 5).

  The shroud 66 has a front surface and a rear surface opened. The outer periphery of the muffler 61 is fitted into the rear surface opening with a gap, and a fan cover 71 made of aluminum die cast is fitted so as to cover the front opening. . The fan cover 71 covering the generator G and the cooling fan 57 is fastened to the cylinder head 50 of the engine E by bolts 72 and the lower part is fastened to the crankcase 48 of the engine E by two bolts 73 and 73. (See FIGS. 7 and 8).

A recoil starter 75 is fixed to the central opening of the fan cover 71 with three bolts 74. The recoil starter 75 includes a reel 77 rotatably supported by a recoil starter cover 76, a cable 78 wound around the reel 77 at one end and passing through the right reinforcing frame 27 and the right cover 13 at the other end, and the other end of the cable 78. It includes an operation knob 79 provided, and a disengaging drive member 80 provided on the reel 77 to the cooling fan 57 and the driven member 57 ₁ integral (see FIGS. 7 and 8). Cooling air introduction ports 76 ₁ ... Are formed in the recoil starter cover 76, and a cooling air introduction port 64 is also formed between the lower end of the recoil starter cover 76 and the front lower portion of the shroud 66 (see FIG. 7).

When pulling the cable 78 to rotate the reel 77 in the operating knob 79, the driving member 80 actuated by a cam mechanism (not shown) rotates the cooling fan 57 in engagement with the driven member 57 _1, flywheel fan 57 The crankshaft 47 connected via 55 can be cranked to start the engine E. Operation knob release the 79 and the driving member 80 is disengaged from the driven member 57 _1, the reel 77 returns reversely rotated with the return spring (not shown) while winding the cable 78 to the original position.

As is apparent from FIGS. 9 and 10, the left shroud half 67, the opening 81 ₁ of the rectangle are formed so as to be surrounded by the right shroud half 68 and the fan cover 71, the engine E through the opening 81 ₁ The head cover 51 protrudes outside the shroud 66. A wind guide plate 51 ₁ extending obliquely downward and forward is integrally formed at the front portion of the head cover 51, and the wind guide plate 51 ₁ and a notch 50 ₁ formed on the front upper surface of the cylinder head 50 (FIG. 9). A space for forming the air guide path 82 (see FIG. 10). A guide member 84 for attaching / detaching the ignition plug 83 to / from the cylinder head 50 is attached to the ignition plug attaching / detaching hole 51 ₂ formed in the center of the air guide plate 51 ₁ , and the upper end opening of the guide member 84 is attachable / detachable. The cap 84 _{1 is} closed. An ignition coil 65 is provided at the upper end of the fan cover 71 adjacent to the spark plug 83.

Since the guide member 84 faces the ignition plug replacement lid 12 ₁ of the left side cover 12 (see FIG. 2), the ignition plug replacement lid 12 ₁ is opened, and the cap 84 ₁ is removed to remove the ignition plug attachment / detachment hole. 51 ₂ can be easily perform maintenance of the ignition plug 83 via the. If the left side cover 12 and the right side cover 13 are removed, the head cover 51 exposed from the shroud 66 is removed without removing the left shroud half 67 and the right shroud half 68, and the movement covered by the head cover 51 is removed. Maintenance of the valve mechanism, for example, adjustment of the tappet clearance can be easily performed.

7, as apparent from FIGS. 10 and 11, plate-shaped support portion 51 ₃ extending in the front-rear direction on the upper surface of the head cover 51 of the engine is protruded. A circular support hole 51 ₄ formed in the center of the supporting portion 51 ₃ is fitted pair of left and right rubber bushings 85, 85, collar 86 is inserted through their internal. A bolt 87a inserted from the left side cover 12 side at the rear portion of the carrying handle 17 is fastened to an embedded nut 87b provided on the right side cover 13, and the inner surfaces of the left side cover 12 and the right side cover 13 near the bolt 87a. The bosses 12 ₂ and 13 ₂ are respectively provided in the projecting manner. In the state where the washers 88, 88 are disposed at both ends of the left and right rubber bushes 85, 85, both ends of the connecting pin 89 passing through the washers 88, 88 and the collar 86 are the bosses of the left side cover 12 and the right side cover 13. 12 ₂ and 13 ₂ are fitted.

As apparent from FIGS. 6, 7, and 12, the mounting bracket 91 is fixed to the rear lower portion of the crankcase 48 of the engine E with two bolts 90, 90. Mounting bracket 91 protrudes to the outside from the bottom of the opening 81 ₂ after the shroud 66, there pair of rubber bushings 92, 92 are fitted. A pair of left and right mounting ribs 16 ₁ , 16 ₁ are formed on the upper surface of the rear portion of the under cover 16 of the case 11, and the rubber bushing 92 is formed on the outer periphery of the central portion of the collar 93 that bridges between the pair of mounting ribs 16 ₁ , 16 _1. , 92 are supported via a pair of left and right washers 95,95. Then, the bolt 94a inserted through the boss 13 ₃ of the right side cover 13 and penetrating the collar 93 is fastened to the embedded nut 94b provided on the boss 12 ₃ of the left side cover 12, so that the rear of the engine E exposed from the shroud 66 is obtained. The lower part is elastically supported by the under cover 16 via rubber bushes 92 and 92.

7 As is apparent from, the mounting bracket 71 ₁ in the lower portion of the fan cover 71 is formed integrally, the mounting bracket 71 ₁ is the pair of left and right mounting ribs 16 ₂ projecting from the front upper surface of the undercover 16 16 ₂ are elastically supported via bolts 94a. The support structure of the mounting bracket 71 ₁ is substantially the same as the support structure of the mounting bracket 91 described in FIG.

  Thus, in the power generation unit 46, the upper head cover 51 is elastically supported by the carrying handle 17 via the rubber bushes 85 and 85, and the lower rear crankcase 48 is elastically supported by the under cover 16 via the rubber bushes 92 and 92. Since the front lower fan cover 71 is elastically supported by the under cover 16 via the rubber bushes 92, 92, the weight of the power generation unit 46 is distributed to each part of the case 11 to be part of the case 11. It is possible to prevent the load from being concentrated. Moreover, the vibration absorbing action of the rubber bushes 85, 85; 92... Not only prevents the vibration of the engine E from being transmitted to the carrying handle 17, but also prevents the case 11 from resonating due to the vibration of the engine E. can do.

In particular, when lifting the carrying handle 17 to carry the engine generator, most of the weight of the power generating unit 46 including the engine E and the generator G, the rubber bushing 85, 85 from the support portion 51 ₃ of the head cover 51, the connecting pin 89 and the bosses 12 ₂ and 13 ₂ are supported by the carrying handle 17 of the case 11. That is, the power generation unit 46 is directly suspended from the carrying handle 17, and the case 11 itself does not need to support the weight of the power generation unit 46. Therefore, the thickness of the case 11 connected to the lower part of the carrying handle 17 is reduced. Not only can it be reduced in weight, but the design freedom of the shape and material of the case 11 can be greatly increased.

Moreover, since the support head cover 51 protruding from the opening 81 ₁ in the upper surface of the shroud 66 upwards carrying handle 17, when completely covers the head cover 51 in the shroud 66, for supporting the upper end of the shroud 66 to the carrying handle 17 In comparison, the overall height of the engine generator can be kept low.

  By the way, when the carrying handle 17 is lifted, most of the weight of the power generation unit 46 is applied to the rear part of the carrying handle 17 via the head cover 51 of the engine E, so that a bending load is applied to the carrying handle 17 and the case 11 in the vicinity thereof. Will work. However, the lower part of the power generation unit 46, that is, the lower part of the fan cover 71 and the lower part of the crankcase 48 are supported by the front part of the carrying handle 17 via the highly rigid left reinforcing frame 26 and right reinforcing frame 27. Since the load is distributed to the front and rear of the carrying handle 17 without burdening the left side cover 12 and the right side cover 13, the bending load applied to the carrying handle 17 and the case 11 in the vicinity thereof is reduced. Can be reduced.

Also, a fan cover 71 made of aluminum die cast is fastened to the crankcase 48 and the cylinder head 50 to form a block, and a mounting bracket 91 of the crankcase 48 and a mounting bracket 71 ₁ of the fan cover 71 projecting from the shroud 66 covering the outer periphery thereof are provided. The power generating unit 46 is supported without the need for a special support member such as an engine bed because it is supported by the mounting ribs 16 ₁ , 16 ₁ ; 16 ₂ , 16 ₂ of the under cover 16 via the rubber bushes 92, 92, respectively. It is possible to reliably support the under cover 16.

  When the engine generator is installed on the ground or floor, most of the weight of the power generation unit 46 is directly transmitted to the under cover 16 provided with the support legs 21. Even if the rigidity is set low, deformation due to load does not occur.

  Furthermore, the left side cover 12 and the right side cover 13 can be separated from the under cover 16 by simply removing the four bolts 30a, 87a, 94a, 94a with the engine generator installed on the ground or floor. Therefore, the engine E and the generator G can be exposed and easily maintained without laying the engine generator on its side.

  Next, the effect | action regarding cooling of an engine generator is demonstrated.

When the engine E is operated to drive the generator G, the cooling fan 57 provided on the flywheel 55 of the generator G rotates in the shroud 66. External air passes through the cooling air introduction openings 14 ₁ and 14 ₂ (see FIGS. 3 and 4) of the front cover 14 due to the negative pressure generated as the cooling fan 57 rotates, and serves as cooling air inside the case 11. be introduced. Reference numeral 14 ₃ denotes a guide for cooling air introduced from the cooling air introduction opening 14 ₂ . The cooling air is introduced into the fan cover 71 and the shroud 66 through the cooling air introduction port 76 ₁ ... Formed in the recoil starter cover 76 and the cooling air introduction port 64 formed below the recoil starter cover 76. generator G housed therein, after cooling the engine E and the muffler 61 is discharged from the shroud 66 and passes through the gap between the muffler 61 cooling air discharge port 15 ₂ formed rear cover 15 to the outside of the case 11 The Openings 66 (see FIG. 7) are formed in the flywheel 55 and the cooling fan 57, and the heated air in the generator G is sucked into the shroud 71 through the openings 66.

When the cooling air flows inside the shroud 66, the air guide plate 51 ₁ formed integrally with the head cover 51 of the engine E cooperates with the fan cover 71, the left shroud half 67 and the right shroud half 68 to guide the air guide path. 82 is constituted, the flow of the cooling air in the shroud 66 can be made smooth to enhance the cooling effect. In addition, since the cooling air flows directly through the aluminum die-cast face cover 71 coupled to the engine E, the face cover 71 functions as a heat sink, and the cooling performance of the engine E is enhanced.

  Thus, since the generator G, the engine E, and the muffler 61, which are heating elements, are cooled while the cooling air flows through the inside of the case 11 in a substantially straight line from the front to the rear, cooling is performed while suppressing the flow resistance of the cooling air. Not only can the efficiency be increased, but the number of cooling fans 57 can be reduced to one to reduce the number of parts. Further, the noise generated by the engine E and the cooling fan 57 is effectively reduced by the shroud 66 and the case 11 that cover them twice, and the engine generator can be operated silently.

  Although the embodiments of the present invention have been described above, various design changes can be made without departing from the scope of the present invention.

  For example, although the generator G is illustrated as a work machine in the embodiment, the present invention can also be applied to other work machines such as a compressor and a pump. Moreover, although rubber bush 85,85 was illustrated as an elastic member in the Example, it is possible to employ | adopt other elastic members, such as a spring. In the embodiment, the carrying handle 17 is configured as a part of the case 11. However, the carrying handle 17 may be configured as a separate member and attached to the case 11.

Overall side view of engine generator 2-2 line view of FIG. 3-3 sectional view of FIG. Sectional view along line 4-4 in FIG. Sectional view along line 5-5 in FIG. 6 direction arrow view of FIG. 7-7 arrow view of FIG. Sectional view taken along line 8-8 in FIG. 9 direction view of FIG. 10 enlarged view of FIG. 11-11 sectional view of FIG. 12 enlarged view of FIG. Exploded perspective view of engine generator

Explanation of symbols

11 Case 17 Carrying handle 48 Crank case 49 Cylinder block 50 Cylinder head 51 Head cover 51 ₁ Air guide plate 51 ₂ Spark plug attaching / detaching port 51 ₃ Supporting part 57 Cooling fan 61 Muffler 66 Shroud 81 ₁ Opening 82 Air guide path 83 Spark plug 85 Rubber Bush (anti-vibration member)
E Engine G Generator (work machine)

Claims (4)

An engine (E) having a shroud (66) for guiding cooling air inside a case (11) having a carrying handle (17) at the top, and an operation connected to and driven by the engine (E). In the engine working machine storing the machine (G),
A cylinder block (49) and a cylinder head (50) of the engine (E) are covered with a shroud (66) attached to the engine (E), and a head cover (51) coupled to the cylinder head (50) is attached to the engine (E It is exposed from the upper part of the shroud (66) mounted to the cylinder head (50) so as to be detachable from the outside of the shroud (66), and the head cover (51) is a carrying handle of the case (11). (17) The engine working machine characterized by being fixed to. The support portion (51 ₃ ) formed integrally with the head cover (51) is fixed to the carrying handle (17) of the case (11) via a vibration isolating member (85). Engine work machine. A wind guide plate (51 ₁ ) constituting the wind guide path (82) in cooperation with the shroud (66) is formed integrally with the head cover (51), and the wind guide plate (51 ₁ ) is connected to the engine (E). The engine working machine according to claim 1 or 2, wherein an ignition plug attaching / detaching port (51 ₂ ) for attaching / detaching the ignition plug (83) is formed. The working machine is a generator (G), and the cooling air introduced into the case (11) by the cooling fan (57) provided in the generator (G) is generated by the generator (G), the engine (E), and The engine working machine according to any one of claims 1 to 3, wherein the muffler (61) is cooled and discharged out of the case (11).

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