JP2007064088A - Engine working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive engine working machine having good engine cooling performance.
A gas engine work machine 1, which is an example of an engine work machine, has a generator 50, a cooling fan 80, an engine 40, and a starter 45 arranged in order from the front side to the rear side in a front-rear direction in a case 10, and left A first intake port 23 and a second intake port 25 are provided at the front upper part of the side cover and right side cover 12 and the rear lower part of these covers, and an exhaust port 14 a is provided at the rear upper part of the case 10. The cooling fan 80 is configured integrally with a first cooling fan 83 that introduces outside air from the first intake port 23 and a second cooling fan 85 that introduces outside air from the second intake port 25. When the cooling fan 80 is driven, the outside air introduced from the first intake port 23 is introduced from the first cooling air passage 91 that cools the generator 50 and the upper part of the engine and is discharged from the discharge port 14a, and the second intake port 25. The outside air forms a second cooling air passage 92 that cools the engine 40 and discharges it from the discharge port 14a.
[Selection] Figure 3

Description

  The present invention relates to an engine working machine, and more particularly to an engine, a working machine driven by receiving power from the engine, and an engine working machine that houses a fuel container and the like in a case.

  Such an engine working machine includes a hand-held engine generator equipped with a generator that generates electric power from the engine. Since the generator and engine of such an engine generator generate heat, if they are stored in the case, the inside of the case becomes hot, and thus various parts stored in the case must be cooled.

  Therefore, a cooling ventilation shroud is provided in the case, and a generator, a starter, and a cooling fan are accommodated in the cooling ventilation shroud. When the cooling fan is driven, the outside air taken in from the intake port of the case is cooled. An engine generator described in Patent Document 1 (portable engine working machine in the literature) is proposed that is configured to flow through the interior shroud, cool the generator and engine, and discharge the engine and the engine out of the case.

  Further, in Patent Document 2, a fuel tank, an engine, and a work machine (power generation body in the literature) are sequentially arranged from one side to the other side (from the left side to the right side in the literature) in a case (a sound insulation cover in the literature). An engine cooling fan is disposed between the engine and the engine, a power generator cooling fan is disposed on the other side of the work machine, and when the engine cooling fan is driven, it is formed at one end of the front cover of the case. When the outside air introduced from the first intake port cools the engine and is discharged from an exhaust port (exhaust opening in the literature) formed at the other end of the case, and the power generator cooling fan is driven, the rear cover of the case There has been proposed an engine generator configured such that outside air introduced from a second intake port formed at the other end of the engine cools the engine and work implement and is discharged from the exhaust port.

Japanese Patent No. 3347045 Japanese Patent Laid-Open No. 2003-293771

  In the device described in Patent Document 1, since the flow of the cooling air is unidirectional, the outside air that has been warmed by cooling the generator cools the engine. For this reason, the cooling of the engine may be insufficient depending on the usage environment and usage conditions.

  On the other hand, the thing of patent document 2 has a possibility that the cooling of an engine may become inadequate because the flow of cooling air is two directions, but the engine accommodated in a case is for driving a generator. Since it is made for exclusive use, when it is going to mount a general purpose engine, a generator cannot be combined with this general purpose engine. In other words, it is necessary to make a dedicated engine in order to connect the generator directly to the engine. For this reason, the thing of patent document 2 has the problem that cost increases. The same applies to the one described in Patent Document 1.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an inexpensive engine working machine having good engine cooling performance.

  In order to solve such a problem, the present invention receives an engine driven by fuel supplied from a fuel container (for example, the liquefied gas cylinder 30 in the embodiment), a starter for starting the engine, and power from the engine. A working machine that performs a predetermined work (for example, the generator 50 in the embodiment) and a cooling fan that is driven by receiving power from the engine are housed in the case, and an intake port (for example, the first in the embodiment). An engine work machine (for example, an implementation of an engine having an intake port 23, a second intake port 25) and an exhaust port, in which outside air is introduced from the intake port by a cooling fan and the engine and work implements are cooled is discharged from the exhaust port. In the gas engine working machine 1) in the embodiment, a working machine, a cooling fan, an engine, and a starter are provided from one side in the front-rear direction in the case to the other side. And following arrangement, a first intake port and a second intake port in the longitudinal direction on one side and the air inlet on the other side of the case is provided, characterized in that a discharge opening in the longitudinal direction other side of the case.

  According to the present invention, when a work machine, a cooling fan, an engine, and a starter are sequentially arranged from one side to the other side in the front-rear direction in the case, a cooling fan that can be connected to the engine and the work machine is used. A work machine can be connected to the engine via a fan. For this reason, it is not necessary for the engine to be dedicated to the work machine, a general-purpose engine can be used, and the cost of the engine work machine can be reduced. Further, by providing the first intake port and the second intake port on one side and the other side of the case in the front-rear direction and providing the exhaust port on the other side of the case in the front-rear direction, the cooling air passage can be made into two systems. For this reason, the cooling performance of the engine can be improved.

  The cooling fan of the present invention is characterized by having a first cooling fan for introducing outside air from the first air inlet and a second cooling fan for introducing outside air from the second air inlet. To do.

  According to the present invention, the cooling fan has the first cooling fan and the second cooling fan and is integrally configured, so that the number of parts of the cooling fan is reduced and the cost is reduced. The machine itself can be reduced in weight.

  The first intake port of the present invention is provided at one end of the case in the front-rear direction, the second intake port is provided at the lower part of the case disposed near the lower part of the engine, and the exhaust port is the upper part of the engine. A first cooling air passage that is provided in an upper portion of a case disposed in the vicinity, and when the cooling fan is driven, the outside air introduced from the first intake port cools at least the work implement and the engine and is discharged from the discharge port; The present invention is characterized in that a second cooling air passage is formed in which the outside air introduced from the second intake port cools at least the engine and is discharged from the discharge port.

  According to the present invention, the first intake port is provided at one end in the front-rear direction of the case, the second intake port is provided at the lower part of the case near the lower part of the engine, and the exhaust port is provided at the upper part of the case near the upper part of the engine. When the cooling fan is driven, a first cooling air passage that cools the work implement and the engine with the outside air introduced from the first intake port, and a second cooling that cools the engine with the outside air introduced from the second intake port By configuring the air path, the engine can be cooled by the outside air flowing through the two paths, and the cooling performance of the engine can be improved.

  Further, on the downstream sides of the first cooling air passage and the second cooling air passage according to the present invention, the outside air introduced from the first intake port to cool the work implement is introduced from the second intake port and flows below the engine. The outside air extends so as to join the outside air and cool at least the upper side of the engine.

  According to this invention, the downstream sides of the first cooling air passage and the second cooling air passage are integrated by extending the downstream sides of the first cooling air passage and the second cooling air passage. Therefore, it is possible to suppress the enlargement of the case and to reduce the size of the engine working machine.

  According to the engine working machine according to the present invention, the working machine, the cooling fan, the engine, and the starter are sequentially arranged from one side in the front-rear direction in the case to the other side, and the first on the one side and the other side in the front-rear direction of the case. By providing the intake port and the second intake port and providing the exhaust port on the other side in the front-rear direction of the case, it is possible to provide an inexpensive engine working machine with good engine cooling performance.

  A preferred embodiment of an engine working machine according to the present invention will be described below with reference to FIGS. In the present embodiment, a hand-held gas engine generator will be described as an example. 3 shows an internal structure diagram of the gas engine generator in a right side view, and FIG. 4 shows an internal structure diagram of the gas engine generator in a plan view.

  As shown in FIG. 1 (perspective view), FIG. 2 (perspective view) and FIG. 3, the gas engine working machine 1 includes a case 10 formed in a box shape, an engine 40 driven with liquefied gas as fuel, an engine And a generator 50 that generates power by receiving power from 40.

  The case 10 is made of a synthetic resin material and includes a left side cover 11, a right side cover 12, a front cylinder cover 13 and a rear cover 14. The left side cover 11 and the right side cover 12 are configured substantially symmetrically so that the left side in the width direction, the right side in the width direction, and the upper part are covered when these are arranged opposite to each other, and the liquefied gas cylinder 30 and the engine 40 can be accommodated therein. A space 16 is formed. A handle portion 18 extending in the front-rear direction is formed on the upper portion, a front opening portion 20 extending in the vertical direction is formed on the front end portion, and an inspection opening portion 22 is formed on the rear upper portion. A plurality of first intake ports 23 extending in the front-rear direction are provided in front upper portions of the left side cover 11 and the right side cover 12, and a second intake air extending in the front-rear direction is provided in the rear lower portions of the left side cover 11 and the right side cover 12. A plurality of ports 25 are provided. The left side cover 11 and the right side cover 12 are fastened and integrated by fastening means of bolts and nuts in a state of being opposed to each other.

  The front cylinder cover 13 covers the front opening 20, and the upper side is rotatable in the front-rear direction with the lower end portion as a rotation fulcrum. When the front opening 20 is opened by the front cylinder cover 13, the side surfaces of the liquefied gas cylinder 30 and the mounting section 60 to which the liquefied gas cylinder 30, which will be described later, disposed in the space portion 16 and the bottom surface of the liquefied gas cylinder 30 are exposed. Can do. The front cylinder cover 13 is provided with a plurality of holes 13a for exposing a lamp 65, a switch 66, an outlet 67 and the like attached to a panel 63 described later.

  The panel 63 is attached to the front end of the base plate 24 attached to the bottom of the case 10 and extends in the vertical direction along the inner surface of the front cylinder cover 13 with the front opening 20 closed. When the front opening 20 is closed by the front cylinder cover 13, the lamp 65, the switch 66, the outlet 67, and the like attached to the panel 63 are holes corresponding to the plurality of holes 13 a provided in the front cylinder cover 13. It arrange | positions so that it may insert in the part 13a.

  The rear cover 14 covers the inspection opening 22, and a plurality of exhaust ports 14 a are provided at the rear, and an insertion hole (not shown) through which a rope connected to an operation knob 45 a described later is provided on the left side. The rear cover 14 is fixed to the left side cover 11 and the right side cover 12 integrated by fastening means (not shown). The inspection opening 22 is formed such that the upper rear portion of the case 10 and the upper portions of the left and right side surfaces on the rear side of the case are opened. Maintenance of the engine 40 accommodated in the case 10 can be performed through the inspection opening 22.

  The panel 63, the mounting portion 60, the generator 50, the cooling fan 80, and the engine 40 are sequentially attached from the front side to the rear side on the base plate 24 at the bottom in the space portion 16 of the case 10 thus configured. .

  As shown in FIGS. 3 and 4, the engine 40 is a so-called four-cycle engine, and includes a crankcase 41, a cylinder block 42, a cylinder head 43, and a head cover 44. A regulator 70 is attached to the left side surface of the cylinder head 43, and an air cleaner 72 is attached to the left side of the cylinder head 43 via an intake pipe. A muffler 74 is attached to the rear end portion of the exhaust pipe extending from the right side surface of the cylinder head 43. A starter portion 45 is provided on the rear side surface of the crankcase 41.

  A tubular vaporizer (not shown) is connected to the regulator 70, and the other end of the vaporizer is connected to a fuel pipe through which liquid fuel supplied from the liquefied gas cylinder 30 flows. For this reason, the liquid fuel supplied from the liquefied gas cylinder 30 flows in the fuel pipe and is heated and vaporized in the vaporizer heated by the heat from the engine 40.

  The cooling fan 80 is disposed between the generator 50 and the engine 40 and is disposed coaxially with the crankshaft 41a. As shown in FIG. 5 (side view), the cooling fan 80 has radial blades 84 in the circumferential direction on one side surface of a disk-shaped base 82 having a fixing hole 81 for fixing the crankshaft 41a at the center. A plurality of first cooling fans 83 and a second cooling fan 85 in which a plurality of blades 86 curved on the other side surface of the base 82 are arranged in the circumferential direction are provided. As shown in FIGS. 3 and 5, the cooling fan 80 is fixed via a bolt 87 fastened to the tip of the crankshaft 41 a inserted through the fixing hole 81. For this reason, when the crankshaft 41a rotates, the first cooling fan 83 and the second cooling fan 85 rotate. An attachment surface for attaching a shaft portion 51 of the generator 50 described later is formed on the front surface of the base 82, and a plurality of female screw portions for fixing the shaft portion 51 are provided on the attachment surface.

  As shown in FIGS. 3 and 4, the generator 50 includes a rotor 52 fixed to a tip end portion of a shaft portion 51 fastened to a base 82 of a cooling fan 80, and a stator disposed inside the rotor 52. 53 and a case 54 covering them. The shaft portion 51 has a flange portion 51a on the proximal end side, and a bolt 55 inserted through the flange portion 51a is screwed into a female screw portion provided on the mounting surface, thereby fixing the generator 50 to the cooling fan 80. be able to. For this reason, when the crankshaft 41 a rotates, the generator 50 generates power by rotating the shaft portion 51 via the base 82 and rotating the rotor 52 around the stator 53. A plurality of air holes 54a for allowing air to pass therethrough are provided in the circumferential direction at predetermined intervals in the front surface portion and the rear surface portion of the case 54.

  When the cooling fan 80 of the gas engine generator 1 configured as described above rotates, the outside air introduced from the first air inlet 23 into the space 16 passes through the air holes 54a of the generator 50 and the generator 50. The first cooling air passage 91 that flows through the space 16 between the first cooling fan 83 and the space 16 around the upper part of the engine and exhausts from the exhaust port 14a, and the outside air introduced from the second air intake 25 is the engine. The second cooling air that flows through the space 16 on the lower side, flows upward in the space 16 between the second cooling fan 85 and the engine 40, flows in the space 16 around the upper part of the engine, and is discharged from the discharge port 14a. A path 92 is formed. The respective downstream sides of the first cooling air passage 91 and the second cooling air passage 92 merge at the space 16 around the upper part of the engine.

  A pair of mounting portions 60 are provided at predetermined intervals in the left-right direction, and a connecting portion 61 is attached between the mounting portions 60. A supply channel (not shown) for flowing the liquid fuel supplied from the liquefied gas cylinder 30 mounted on the mounting unit 60 is formed in the mounting unit 60 and the connection unit 61, and the supply channel is connected to the connection unit 61. Communicated with the connected fuel pipe. The mounting portion 60 includes a contact portion 60a with which the head 32 of the liquefied gas cylinder 30 is detachably contacted.

  The liquefied gas cylinder 30 attached to the mounting part 60 includes a cylinder main body 31 that stores the liquid fuel L and a head 32 that protrudes from the tip of the cylinder main body 31, with the fuel outlet facing downward. It is arranged vertically and is detachably mounted on the mounting portion 60. When the liquefied gas cylinder 30 is mounted on the mounting portion 60, an on-off valve (not shown) provided in the head 32 is opened, and the liquid fuel L in the liquefied gas cylinder 30 flows through the mounting portion 60, and the fuel piping and It flows through the vaporizer and is supplied to the regulator 70.

  An inverter 76 is attached to the left end portion of the base plate 24. The inverter 76 is formed in a box shape, is arranged vertically, and is electrically connected to the generator 50 via a harness, a connector, or the like, and the electric power generated by the generator 50 is 50 Hz or 60 Hz. It has a function of converting to alternating current and supplying it to the outlet 67 shown in FIG.

  In order to start the gas engine working machine 1 configured as described above, the engine 40 is started by pulling the operation knob 45a shown in FIG. At this time, the liquid fuel supplied from the liquefied gas cylinder 30 flows through the fuel pipe and is heated and vaporized by the vaporizer 75. The gaseous fuel that has become gas flows into the regulator 70 and is mixed with the air from the air cleaner 72 to become an air-fuel mixture. Then, this air-fuel mixture is supplied to the engine 40 and the engine 40 is driven. Then, the generator 50 generates power by the rotation of the crankshaft 41a, is converted into desired power by the inverter 76, and is supplied to the outlet 67 shown in FIG.

  Further, the first cooling fan 83 and the second cooling fan 85 of the cooling fan 80 are rotated together by the rotation of the crankshaft 41a. Then, the outside air introduced from the first intake port 23 passes through the first cooling air passage 91 and cools the generator 50 and the upper part of the engine 40. The outside air introduced from the second intake port 25 passes through the second cooling air passage 92 and cools the upper portion of the engine 40.

  Thus, since the gas engine generator 1 has two air paths for cooling the engine 40 having a large calorific value, the cooling performance of the engine 40 is good.

  In addition, the generator 50, the cooling fan 80, the engine 40, and the stator 53 are sequentially arranged from the front side to the rear side in the front-rear direction in the case 10, and the cooling fan 80 is attached to the crankshaft extending from the engine. Since the shaft portion 51 is fastened to the base 82 of the cooling fan 80, the generator 50 can be connected to the engine 40 via the cooling fan 80. Therefore, the engine 40 does not need to be dedicated to the generator 50, a general-purpose engine can be used, and the cost of the gas engine generator 1 can be reduced.

  In the above-described embodiment, the gas engine working machine 1 is shown as an example of the engine working machine. However, a portable working machine such as a hand-held blower may be used. The engine may be a general-purpose engine driven by fuel (gasoline or mixed oil) supplied from a fuel tank.

The front side perspective view of the gas engine working machine concerning one embodiment of the present invention is shown. The rear perspective view of a gas engine working machine is shown. The internal structure figure in the right side view of a gas engine working machine is shown. The internal structure figure in planar view of a gas engine working machine is shown. The side view of a cooling fan is shown.

Explanation of symbols

1 Gas engine generator (engine work machine)
10 Case 23 First inlet (inlet)
25 Second inlet (inlet)
30 Liquefied gas cylinder (fuel container)
40 Engine 45 Starter (starter)
50 Generator (work machine)
80 cooling fan 83 first cooling fan 85 second cooling fan 91 first cooling air passage 92 second cooling air passage

Claims (4)

An engine that is driven by fuel supplied from a fuel container, a starter that starts the engine, a working machine that receives power from the engine, performs a predetermined operation, and a cooling fan that is driven by power from the engine are placed in the case. In the engine working machine for storing, providing the case with an intake port and an exhaust port, and introducing the outside air from the intake port by the cooling fan to cool the engine and the working machine etc., and discharging the warm air from the exhaust port,
The working machine, the cooling fan, the engine, and the starter are sequentially arranged from one side in the front-back direction in the case to the other side,
An engine working machine, wherein a first intake port and a second intake port of the intake port are provided on one side and the other side in the front-rear direction of the case, and the exhaust port is provided on the other side in the front-rear direction of the case.   The cooling fan includes a first cooling fan that introduces outside air from the first intake port and a second cooling fan that introduces outside air from the second intake port, and is configured integrally. The engine working machine according to claim 1. The first intake port is provided at one end portion in the front-rear direction of the case, the second intake port is provided in a lower portion of the case disposed near the lower part of the engine, and the exhaust port is provided in the engine Provided in the upper part of the case disposed near the upper part of
When the cooling fan is driven, outside air introduced from the first intake port is introduced from the first cooling air passage that cools at least the work implement and the engine and is discharged from the discharge port, and the second intake port. 3. The engine working machine according to claim 1, wherein the outside cooling air constitutes a second cooling air passage that cools at least the engine and discharges it from the discharge port. 4. Each downstream side of the first cooling air passage and the second cooling air passage is provided on the lower side of the engine by introducing outside air introduced from the first air inlet and cooling the work implement from the second air inlet. The engine working machine according to claim 3, wherein the engine working machine extends so as to merge with outside air flowing through the engine so that the outside air cools at least the upper side of the engine.

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