JP2014058887A - Engine work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine work machine capable of being mounted on an engine easily by selecting a cell motor and a recoil starter.SOLUTION: An engine work machine includes: a cell starter unit 30 having a cell motor 32 and a speed reduction mechanism; a battery 60; a control circuit board 55; and a start switch 54 of a motor. A one-way clutch is provided at a tip of a crank shaft, the cell starter unit 30 and the switch unit 50 are connected by a lead wire 47, and the cell starter unit 30 is configured in a manner attachable to/detachable from a surface having the one-way clutch of a crank case of an engine. The cell starter unit 30 is fixed at the crank case by a latch mechanism, a bolt or a screw. At an end surface part of the crank case, a switch is arranged, and when the cell starter unit 30 is mounted on the crank case, by the switch being pressed by the cell starter unit 30, an ignition plug becomes conductive and the engine becomes operable.

Description

  The present invention relates to an engine working machine mainly used as a power source for an engine working machine such as a brush cutter or a cultivator, and more particularly to an engine working machine that can be easily mounted on an engine by selecting a cell motor and a recoil starter.

  A small engine such as a brush cutter or a cultivator widely uses a small engine as a power source. FIG. 11 is an external view of a brush cutter that is an example of a conventional engine working machine 101. As shown in FIG. 1, an engine work machine 101 equipped with a small two-cycle engine is an engine in which a drive shaft (not shown) is passed through a pipe-shaped main pipe 104 and the drive shaft is provided at one end of the main pipe 104. By rotating, the rotary blade 112 provided at the other end of the main pipe 104 is rotated. In the vicinity of the rotary blade 112, a scattering protection cover 113 for preventing scattering of the cut grass is provided. The engine work machine 101 is carried by a suspension belt (not shown) or the like, and a handle 172 having a substantially U-shape in front view for operation by an operator is attached to the vicinity of the central portion of the main pipe 104. Grip portions 173 are provided at both ends of the handle 172, and the rotation speed of the engine work machine 101 is controlled by an operator by a throttle lever 176 attached to one grip portion. The operation of the throttle lever 176 is transmitted to the carburetor of the engine through the wire 175.

  In portable work machines such as brush cutters and blowers, a small engine is used as a power source as disclosed in Patent Document 1 because of its compactness, large output, and long operation time. The engine is small and light and can obtain a large output, and has an advantage that it can be operated for a long time by refueling. On the other hand, since it is necessary for the engine to reciprocate the piston by combustion of the air-fuel mixture, it may take time to start compared to an electric motor.

Japanese Utility Model Publication No. 63-79469

  A two-cycle engine is widely used for a small engine working machine such as a hand-held brush cutter, and a manual recoil starter is generally used for starting the engine. An operator who starts the engine operates the choke mechanism and starts the engine by pulling the handle of the recoil starter strongly. However, in a conventional small engine, it often takes time to start the engine when the operation of the choke is not appropriate, insufficient rotation at the start, or other reasons. Therefore, in recent years, realization of an engine working machine with a cell motor has been required to reduce the burden on the worker. However, in order to provide a cell motor on a small engine working machine, it is necessary to provide a relatively heavy rotating body called a motor and also to install a battery as a power source for the motor. Some users prefer recoil starters over cell motors because they grow larger and heavier.

  The present invention has been made in view of the above background, and an object thereof is to provide an engine working machine that can easily start an engine with a cell starter.

  Another object of the present invention is to provide an engine working machine that allows a cell starter and a manual starter to be selectively mounted.

  Still another object of the present invention is to provide a structure in which a cell starter and a manual starter can be attached / detached / replaced with a single touch. When starting of a cell starter is difficult due to a shortage of battery power, a manual starter is attached to the engine. Is to provide an engine working machine capable of starting the engine.

  The characteristics of representative ones of the inventions disclosed in the present application will be described as follows.

  According to one aspect of the present invention, a work machine is operated by an engine having a cylinder in which a piston can reciprocate, a crankcase that holds the cylinder and forms a crankcase, and a crankshaft that extends through the crankcase. An engine work machine, a cell starter unit having a motor and a speed reduction mechanism, a battery for supplying electric power to the motor, a motor rotation control circuit, a switch unit having a motor start switch, and a tip of the crankshaft A one-way clutch is provided, the cell starter unit and the switch unit are connected by lead wires, and the cell starter unit is configured to be easily detachable from the surface of the crankcase having the one-way clutch. The switch unit further includes a battery for supplying electric power to the motor and a motor rotation control circuit. The cell starter unit is fixed to the crankcase by a latch mechanism and bolt tightening (screw tightening). In addition, instead of the cell starter unit, a manual starter unit provided with a clutch can be attached to the surface of the crankcase having the one-way clutch with one touch.

  According to another feature of the present invention, there is provided switch means for detecting whether or not a cell starter unit or a manual starter unit is mounted, and the engine is operated when neither the cell starter unit nor the manual starter unit is mounted. It was configured not to let it. The switch means is provided on the surface of the crankcase on the side having the one-way clutch, for example, a push-type switch. When the cell starter unit or the manual starter unit is mounted, the switch is pushed by a part thereof and turned on. Become. The switch means is configured so that the wiring of the spark plug can be short-circuited, and only when the cell starter unit or the manual starter unit is attached, the wiring of the spark plug becomes conductive and the engine can be operated. In a state where none of the units are mounted, no high-voltage current is supplied to the spark plug.

  According to still another feature of the present invention, the engine body portion of the engine working machine is covered with a cover so that the operator does not touch it directly, and the switch unit is attached at a position away from the cover. The substrate on which the rotation control circuit is arranged is fixed to the switch unit housing by urethane material inside the switch unit. The battery is composed of, for example, a 14500, 18650 size lithium ion battery, and is configured in a cassette format that can be detached from the cell starter unit.

According to the first aspect of the present invention, the cell starter unit and the switch unit are configured as separate units connected by lead wires, and the cell starter unit is configured to be detachable from the surface having the one-way clutch disposed on the crankshaft. Therefore, an arbitrary form of cell starter unit can be attached to the engine body. Further, since the cell starter unit and the switch unit can be handled as a set, the cell starter unit can be used for various engine bodies.
According to the invention of claim 2, since the switch unit further includes a battery for supplying power to the motor and a rotation control circuit for the motor, the battery and the rotation control circuit can be installed separately from the main body side of the engine. A highly reliable engine work machine can be realized.
According to the invention of claim 3, since the cell starter unit is fixed to the crankcase by the latch mechanism, the cell starter unit can be easily attached to and detached from the engine without using a tool for attachment.
According to the invention of claim 4, since the cell starter unit is fixed to the crankcase with bolts or screws, the cell starter unit can be stably held without fear of dropping off during operation due to vibration or the like.
According to the fifth aspect of the present invention, when the cell starter does not operate normally because the remaining battery level is low, the engine can be started although it is not automatic by replacing the cell starter unit and the manual starter unit. .

According to the sixth aspect of the present invention, the switch means is provided so that the engine is not operated when neither the cell starter unit nor the manual starter unit is mounted, so that the one-way clutch at the time of crank operation is exposed. Therefore, it is possible to provide an engine work machine that can prevent the operator from pinching the hand and improve safety.
According to the invention of claim 7, since the switch means is provided on the surface of the crankcase having the one-way clutch, it can be easily operated when the cell starter unit is attached.
According to the invention of claim 8, since the wiring of the spark plug is conducted only when the cell starter unit or the manual starter unit is attached, the engine tool cannot be used without the cell starter unit or the manual starter unit being attached. Injuries due to the operator's contact with the rotating part of the crankshaft can be prevented.

According to the ninth aspect of the present invention, since the switch unit is attached at a position distant from the engine cover, a switch unit with good operability and ease of use can be realized. In addition, since it is not necessary to arrange electronic components that are components of the control circuit in the vicinity of the engine, it is possible to prevent damage to the electronic components due to heat damage. Further, when the present invention is applied to an existing engine working machine, it is not necessary to make a major modification on the engine side, so that it is possible to realize an engine working machine with reduced cost.
According to the invention of claim 10, since the battery is formed of a lithium ion battery and is configured in a cassette format that is detachable from the cell starter unit, a battery pack widely used in electric tools and the like can be used.

  The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

It is a longitudinal cross-sectional view which shows the internal structure at the time of the cell starter unit attachment of the engine working machine which concerns on the Example of this invention. It is a longitudinal cross-sectional view which shows the internal structure at the time of the cell starter unit removal of the engine working machine which concerns on the Example of this invention. It is a rear view at the time of the cell starter unit removal of the engine working machine which concerns on the Example of this invention. It is a longitudinal cross-sectional view which shows the internal structure of the cell starter unit 30 and the switch unit 50 which concern on the Example of this invention. FIG. 5 is a side view of the engine working machine showing a state where the cell starter unit 30 and the switch unit 50 of FIG. 4 are attached. It is a longitudinal cross-sectional view which shows the internal structure at the time of manual starter unit attachment of the engine working machine which concerns on 2nd Example of this invention. It is a longitudinal cross-sectional view which shows the internal structure at the time of the cell starter unit removal of the engine working machine which concerns on 2nd Example of this invention. It is a rear view which shows the internal structure at the time of the cell starter unit removal of the engine working machine which concerns on 2nd Example of this invention. It is a longitudinal cross-sectional view which shows the internal structure of the cell starter unit 80 and the switch unit 50 which concern on the 2nd Example of this invention. FIG. 6 is a longitudinal sectional view showing a state in which a manual starter unit 90 is attached instead of a manual starter unit 90 in an engine working machine according to a second embodiment of the present invention. It is a perspective view which shows the whole engine work machine 101 whole shape.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same portions are denoted by the same reference numerals, and repeated description is omitted. Further, in this specification, description will be made assuming that the front, rear, left, right, and up and down directions are directions shown in the drawing.

  FIG. 1 is a longitudinal sectional view showing an internal structure of the engine work machine 1 according to the embodiment when the cell starter unit is mounted. The engine 2 is a two-cycle small engine, in which the crankshaft 5 is disposed coaxially with the main pipe 104 (see FIG. 5 described later), and the cylinder 3 is disposed so as to extend from the crankcase 4 substantially upward in the vertical direction. The piston 12 reciprocates up and down in the cylinder 3. The high-voltage current generated by the ignition coil 23 is transmitted to the spark plug 8 through the ignition cord 24 and the plug cap 21. The upper part of the engine 2 is covered with an upper cover 9. The upper cover 9 is manufactured by integral molding of synthetic resin such as plastic. A fuel tank 11 is provided below the crankcase 4 of the engine 2. The fuel tank 11 contains a mixed oil of gasoline and oil for two cycles and is sent to a vaporizer described later.

  One end of a drive shaft (not shown) is connected to the front side (output side) of the crankshaft 5 through a centrifugal clutch 25. The magnet rotor 22 to which the centrifugal clutch 25 is attached is integrally formed with engine cooling fins. The centrifugal clutch 25 is a well-known clutch mechanism in which the oscillator is connected to the clutch drum by centrifugal force when the rotation speed of the crankshaft 5 reaches a certain level.

  A cell starter unit 30 including a cell motor 32 is used as a starting device for the engine 2 of the present embodiment. The cell starter unit 30 is fixed to the end of the crankshaft 5 by some fixing means that can be attached to and detached from the crankcase 4, and the cell motor 32 is rotated by electric power supplied from the outside via the lead wire 47.

  FIG. 2 is a longitudinal sectional view showing a state where the cell starter unit 30 is removed from the engine working machine 1 in the state shown in FIG. A connection drum 28 for connecting the starter unit is provided at the rear end of the crankshaft 5. Oscillators 29 that are oscillated by centrifugal force during rotation are provided at two positions that are axisymmetric with respect to the rotation axis of the connecting drum 28.

  FIG. 3 is a rear view of the engine working machine according to the embodiment of the present invention when the cell starter unit is removed. A muffler 17 is attached to one side (right side) of the cylinder 3, and a vaporizer 7 is provided to the other side (left side) of the cylinder 3. The muffler 17 is covered with a muffler cover 10 manufactured by integral molding of a synthetic resin such as plastic. The carburetor 7 is provided with a manually operated choke lever (not shown), but the structure and operation of the choke lever are well known, and thus detailed description thereof is omitted here. A cleaner element (not shown) accommodated in the cleaner box 6 is provided on the left side of the vaporizer 7.

  Four screw holes 27a to 27d for attaching the starter unit are provided around the end of the crankshaft 5 of the crankcase 4, and the switch 20 is disposed on a part of the joint surface where these are provided. When the cell starter unit 30 or a recoil starter described later is connected to the crankcase 4, the switch 20 is configured to be pushed by the housing of the cell starter unit 30 to turn off the switch. When the switch 20 is turned on, the circuit connecting the ignition coil 23 to the spark plug 8 to the ground is turned on to stop ignition, so that the switch 20 operates as a kill switch or a stop switch. The switch 20 can be constituted by a push-type switch, for example, and may be a switch that is turned off when pushed and turned on when released. With this configuration, when the cell starter unit 30 is removed from the crankcase 4, the switch 20 is turned on, and the output of the ignition coil 23 is short-circuited and conducted to the ground. As described above, since the attachment / detachment detection means (push switch) for detecting whether or not the cell starter unit 30 is attached / detached is provided, it is possible to prevent the engine 2 from operating while the cell starter unit 30 is removed.

  If the cell starter unit 30 is removed after the engine 2 is started and the engine 2 is in operation, the engine 2 is immediately stopped by the switch 20 that is a kill switch, so that it is effectively prevented that the starter unit is removed and the work is performed. it can. The type of the switch 20 may be not only a push-type switch but also a slide-type switch or other switch type. The switch 20 is ignited by the igniting means when the cell starter unit 30 is mounted, and is ignited by the igniting means when removed. As long as a circuit configuration capable of preventing ignition can be realized, it may be realized by any switch means, current interruption means, and other engine stop means. Further, in the present embodiment, the switch 20 is realized by a mechanical switch, but may be realized by an electronic switch or an optical switch means. By providing the switch 20 as described above, it is possible to effectively avoid a dangerous act of an operator such as removing the cell starter unit 30 after starting the engine 2 and working.

  FIG. 4 is a longitudinal sectional view showing the internal structure of the cell starter according to the present embodiment. In the present embodiment, a cell starter unit 30 that can easily start the engine and has a simple operation method is provided, and the switch unit 50 that is provided with switches for supplying power to the cell motor 32 and controlling rotation is separated. Then, they were connected by lead wires 47. The cell starter unit 30 is mainly composed of a DC cell motor 32 housed in a housing 31 and a speed reduction mechanism for reducing the rotational speed of the cell motor 32. Any speed reduction mechanism can be used as the speed reduction mechanism. In this embodiment, the speed reduction mechanism is a planetary gear speed reduction mechanism, and includes a pinion 33 attached to the rotating shaft of the cell motor 32, a plurality of idle gears 34, a ring gear 35, and a plurality of speed reduction mechanisms. The spindle 36 functions as a carrier for the idle gear 34 of the motor. A clutch engagement tool 37 is attached to the front end portion of the spindle 36 by a screw 38. The clutch engaging tool 37 is engaged with the oscillator 29 shown in FIG. 3 to transmit the driving force of the cell motor 32 to the crankshaft 5 side, thereby moving the piston 12. The spindle 36 is rotatably held by the housing 31 by a ball bearing 39.

  The switch unit 50 is connected by a lead wire 47 having a certain length, and includes a power switch 53, a motor start switch 54 for rotating the cell motor 32, a control circuit board 55, a terminal 56, and a battery 60. Consists of including. The battery 60 has two latching portions 63 (not shown), and holds the battery 60 by engaging with a recess (not shown) formed on the inner wall of the housing 51. To remove the battery 60, the battery 60 is pulled out from the housing 51 while pushing the latch 62. When starting the engine 2, the power switch 53 is turned on and then the motor start switch 54 is pressed to rotate the cell motor 32 and start the engine 2.

  For example, three 14500-size lithium ion battery cells (not shown) are accommodated in the battery 60. The shape of the rear end (lower side in the figure) of the battery 60 is formed so as to cover the opening 51 a at the lower end of the housing 51. A control circuit board 55 is provided at the other end of the mounting space of the battery 60 following the opening 51a, and a plurality of terminals 56 are provided so as to extend from the control circuit board 55 toward the opening 51a. Here, the entire control circuit board 55 is coated with a urethane material, so that it is possible to effectively avoid a short circuit in the electronic component mounted on the board even if water enters due to rain or the like. . A plurality of terminals 61 are provided at the front end portion (upper side in the drawing) of the battery 60, and the terminal 61 comes into contact with the terminal 56 by mounting the battery 60 on the housing 51, so that the power of the battery 60 is supplied to the cell motor 32. It becomes possible.

  For the purpose of preventing disconnection, the lead wire 47 connecting the cell starter unit 30 and the switch unit 50 is bundled with several lead wires 47 by a heat shrink tube 48. Further, since the switch 20 is disposed on the end surface portion of the crankcase 4 to which the cell starter unit 30 is attached, when the cell starter unit 30 is mounted on the crankcase 4, it is pushed by a part of the housing 31 (for example, the opening 31a). When the plunger of the switch 20 is pushed, the lead wire 65 (see FIG. 5 described later) of the spark plug 8 is conducted. On the other hand, when the cell starter unit 30 is removed from the end face of the crankcase 4, the pressure of the plunger of the switch 20 is released and the switch 20 is turned on, so that the lead wire 65 is short-circuited and ignition of the engine 2 is prevented. .

  FIG. 5 is a side view showing a mounting state of the cell starter unit 30 and the switch unit 50 according to the embodiment of the present invention. For example, the switch unit 50 can be fixed to the handle 172 of the brush cutter by a hook 66 or the like. When the switch unit 50 is attached to the handle 172, the operator starts the engine 2 while holding the brush cutter. Can be made. Further, the electronic components mounted on the control circuit board 55 can be disposed at a position that is sufficiently thermally separated from the engine 2 and does not have to be disposed in the vicinity of the engine. Damage to the parts can be prevented. For the purpose of preventing disconnection of the lead wire 47 connecting the cell starter unit 30 and the switch unit 50, several lead wires 47 are bundled into one by a heat shrink tube 48. The hook 67 is attached to the main pipe 104 at at least one place.

  As described above, in the engine working machine according to the present embodiment, the cell starter unit is configured to be detachable from the surface having the one-way clutch disposed on the crankshaft. Can be attached. Further, since the cell starter unit and the switch unit can be handled as a set, the cell starter unit can be used for various engine bodies.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the cell starter unit is not attached to the crankcase with bolts, but is affirmed by a latch type so that it can be attached and detached with one touch. FIG. 6 is a longitudinal sectional view showing an internal structure when the manual starter unit of the engine working machine according to the second embodiment of the present invention is attached. In FIG. 6, the engine 72 is different only in the shape of the crankcase 74 and has a shape that matches the opening of the housing 81 of the cell starter unit 80 that is attached in a latch manner. The same components as those of the first embodiment can be used for each component such as a cell motor included in the cell starter unit 80. At two locations on the upper and lower sides of the front end portion of the housing 81, there are provided latch portions 84 that allow the cell starter unit 80 to be attached and detached by pushing the operator so as to be sandwiched between the thumb and forefinger. A locking portion 84a formed in a key shape is provided at the tip of the latch portion 84, and is mounted so as to be hooked on the locking portion 74a formed on the rear side (the surface side having the one-way clutch) of the crankcase 74. The Although not shown, the locking portion 84a is preferably biased radially outward by some means, for example, a spring means, so that it is not inadvertently detached from the locking portion 74a during mounting. The one-touch attachment mechanism using the latch portion 84 is not limited to the illustrated configuration, and other attachment mechanisms may be used as long as they can be attached with one touch without using a tool or with a simple tool. .

  FIG. 7 is a longitudinal sectional view showing a state where the cell starter unit 80 is removed from the engine working machine in the state of FIG. A connection drum 28 for connection of the cell starter unit is provided at the rear end of the crankshaft 5. The connection drum 28 and an oscillator 29 provided at two axially symmetric axes with respect to the rotation axis of the connection drum 28. The same components as in the first embodiment can be used. Here, compared with the crankcase 4 of the first embodiment, the shape of the edge portion of the opening portion to which the starter unit of the crankcase 74 of FIG. 7 is attached is different. This edge portion is configured as a locking portion 74 a with a folded portion on the inside in order to engage with the latch portion 84.

  FIG. 8 is a rear view when the cell starter unit 80 of the engine working machine according to the second embodiment is removed. In the second embodiment, the shape of the rear side of the crankcase 74, that is, the side having the one-way clutch for the cell starter is different, and no screw hole is formed. Instead, a locking portion 74a for engaging with the key-shaped locking portion 84a is formed. The switch 20 is disposed on the rear end face of the crankcase 74. When the cell starter unit 80 is attached to the crankcase 74, the plunger of the push-type switch 20 is pushed by a part of the housing 81 of the cell starter unit 80, so that the lead wire 65 of the spark plug 8 (see FIG. 5 described later). Is open. On the other hand, when the cell starter unit 80 is removed from the end face of the crankcase 74, the pressure of the plunger of the switch 20 is released and the switch 20 is turned on, so that the lead wire 65 is short-circuited and the supply of high-voltage current to the spark plug 8 is stopped. Will do. The connecting drum 28 is provided with a rocker 29. The rocker 29 is rocked so that the inner peripheral side portion of the rocker 29 is moved outward by centrifugal force around a rotating shaft located on the outer peripheral side. The inner peripheral portion of the oscillator 29 comes into contact with the stopper 28b. When the oscillator 29 is in contact with the stopper 28b, the oscillator 29 and the clutch engaging member 37 (see FIG. 9) of the cell starter unit 80 are not in contact with each other. Power transmission between is interrupted.

  FIG. 9 is a longitudinal sectional view showing the internal structure of the cell starter unit 80 and the switch unit 50. In the second embodiment, the configuration on the switch unit 50 side is completely the same as that of the first embodiment, and is configured separately from the cell starter unit 80 and connected by lead wires 47. The cell starter unit 80 is mainly constituted by a DC cell motor 32 housed in a housing 81 and a speed reduction mechanism for reducing the rotational speed of the cell motor 32. As the speed reduction mechanism, the same speed reduction mechanism as that of the first embodiment can be used. The pinion 33 attached to the rotating shaft of the cell motor, the idle gear 34, the ring gear 35, and the spindle 36 acting as a carrier for the plurality of idle gears 34. It is a planetary gear reduction mechanism comprised by these. A clutch engagement tool 37 is attached to the front end portion of the spindle 36 by a screw 38. The clutch engaging tool 37 is engaged with the oscillator 29 to transmit the driving force of the cell motor 32 to the crankshaft 5 through the connecting drum 28 and move the piston 12. The spindle 36 is held by the housing 81 by a ball bearing 39. Latch portions 84 are formed at two positions above and below the front end side opening 81 a of the housing 81, and a locking portion 84 a formed movably by the latch portion 84 is formed on the front side.

  FIG. 10 is a longitudinal sectional view showing a state in which the manual starter unit 90 is attached to the engine working machine 70 according to the second embodiment. In the second embodiment, the cell starter unit 80 is removed from the engine 72 by operating the latch 84 as a relief device when the battery motor 60 is insufficient to start the cell motor 32, and the manual starter unit 90 is removed. Can be attached. As the manual starter unit 90, for example, a recoil starter can be used, which includes a housing 91, a latch portion 94, a rope 93, a spring 96, a clutch engaging tool 92, and a spring 95. Is the same as a normal manual starter. The manual starter unit 90 is provided with a latch portion 94 having a locking portion 94a having the same shape as the cell starter unit 80. The locking portion 94a is locked to a locking portion 74a formed on the crankcase 74 side. By doing so, the manual starter unit 90 can be attached to the crankcase 74.

  As described above, in the second embodiment, since the cell starter unit is fixed to the crankcase by the latch mechanism, the cell starter unit can be easily attached and detached without using a tool for attachment. Further, since the switch 20 is disposed on the end face of the crankcase 74 to which the manual starter unit 90 is connected, when the manual starter unit 90 is mounted on the crankcase 74, the plunger portion of the switch 20 is pushed by a part of the housing 91. As a result, the circuit connecting the wiring from the ignition means to the spark plug to the ground is opened, and a high-voltage current is supplied to the spark plug 8. On the other hand, when the manual starter unit 90 is removed from the end face of the crankcase 74, the switch 20 becomes conductive, the wiring (lead wire 65) from the ignition means to the ignition plug is short-circuited to the ground, and the engine 2 is stopped. Accordingly, it is possible to avoid a dangerous act of an operator such as removing the manual starter unit 90 after the engine 72 is started.

  While the present invention has been described based on a plurality of embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, an example of application to an engine working machine used for a brush cutter has been described. However, the type of the working machine is not limited to the brush cutter, and other engine work such as a chain saw, a cutter, a cultivator, and the like. The same applies to the machine. In the above-described embodiment, the description has been given using the two-cycle engine. However, the present invention can be applied to not only the two-cycle engine but also the four-cycle engine. Further, in the above-described embodiments, the method for attaching the cell starter unit and the crankcase has been described with respect to the method using screws or bolts and the method using latch means. You may comprise.

DESCRIPTION OF SYMBOLS 1 Engine working machine 2 Engine 3 Cylinder 4 Crankcase 5 Crankshaft 6 Cleaner box 7 Vaporizer 8 Spark plug 9 Upper cover 10 Muffler cover 11 Fuel tank 12 Piston 17 Muffler 20 Switch 21 Plug cap 22 Magnet rotor 23 Ignition coil 24 Ignition cord 25 Centrifugal clutch 27a Hole 28 Connection drum 28b Stopper 29 Oscillator 30 Cell starter unit 31 Housing 31a Opening 32 Cell motor 33 Pinion 34 Idle gear 35 Ring gear 36 Spindle 37 Clutch engagement tool 38 Screw 39 Ball bearing 47 Lead wire 48 Thermal contraction Tube 50 Switch unit 51 Housing 51a Opening 53 Power switch 54 Motor start switch 55 Control Road board 56 Terminal 60 Battery 61 Terminal 62 Latch 63 Latching part 65 Lead wire 66, 67 Hook 68 Tube 70 Engine work machine 72 Engine 74 Crankcase 74a Locking part 80 Cell starter unit 81 Housing 81a Opening part 84 Latching part 84a Engagement Stop 90 Manual starter unit 91 Housing 92 Clutch engaging tool 93 Rope 94 Latch part 95 Spring 96 Spring 101 Engine work machine 104 Main pipe 109 Engine cover 112 Rotary blade 113 Splash prevention cover 172 Handle 173 Grip part 175 Wire 176 Throttle lever

Claims (10)

An engine working machine that operates a working machine with an engine having a cylinder in which a piston can reciprocate, a crankcase that holds the cylinder and forms a crank chamber, and a crankshaft that extends through the crankcase,
A cell starter unit having a motor;
A switch unit having a start switch of the motor;
A one-way clutch is provided at the tip of the crankshaft,
The cell starter unit and the switch unit are connected by a lead wire,
An engine working machine, wherein the cell starter unit is configured to be detachable from a surface of the crankcase having the one-way clutch.   The engine work machine according to claim 1, wherein the switch unit further includes a battery for supplying electric power to the motor and a rotation control circuit for the motor.   The engine work machine according to claim 1 or 2, wherein the cell starter unit is fixed to the crankcase by a latch mechanism.   The engine work machine according to claim 1, wherein the cell starter unit is fixed to the crankcase with a bolt or a screw.   5. The manual starter unit provided with a clutch can be attached to the surface of the crankcase having the one-way clutch instead of the cell starter unit. 6. Engine working machine. Provided switch means that operates when the cell starter unit or the manual starter unit is mounted,
The engine working machine according to claim 5, wherein the engine is not operated when neither the cell starter unit nor the manual starter unit is mounted.   The engine working machine according to claim 6, wherein the switch means is provided on a surface of the crankcase having the one-way clutch.   The engine working machine according to claim 6 or 7, wherein the switch means is a kill switch that cuts off ignition by the ignition means when the cell starter unit or the manual starter unit is detached. The engine body portion of the engine working machine is covered with a cover so that an operator does not touch it directly,
The engine work machine according to any one of claims 1 to 8, wherein the switch unit is attached to a position away from the cover.   The engine work machine according to any one of claims 2 to 8, wherein the battery is configured by a lithium ion battery and is configured in a cassette format that is detachable from the switch unit.

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