JP6631194B2 - Engine working machine - Google Patents

Description

  The present invention relates to an engine working machine in which a small engine is used, and more particularly to an improvement in a structure for pulling out a plug cord from inside an engine cover to outside.

  A portable engine such as a bush cutter, a blower, a chain saw, a power cutter, and the like, and a small engine as described in Patent Literature 1 are used as a power source for a portable working machine and a generator. FIG. 9 is a side view of a bush cutter as an example of the conventional engine working machine 101. As shown in FIG. 9, an engine working machine 101 equipped with a small two-cycle engine passes a drive shaft (not shown) through a main pipe 104 on a pipe, and connects the drive shaft to an engine 110 provided at one end of the main pipe. 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 prevention cover 113 for preventing the cut grass from scattering is provided. The engine working machine 101 is attached to the longitudinal rear end of the main pipe 104, and a handle 108 to be gripped by an operator is provided in front of the main working pipe. The handle 108 is provided with a throttle lever 107 for adjusting the engine speed. The operation of the throttle lever 107 is transmitted to a carburetor (not shown) of the engine 110 by a throttle wire (not shown). A sub handle 109 is provided on the front side of the handle portion 108 so that an operator can grasp the handle portion 108 with another hand. The engine 110 used in the engine working machine 101 is small and lightweight, can obtain a large output, and can perform a long-time operation by refueling.

  In a general brush cutter, a cutout for extracting a plug cord from the inside of the engine cover toward the carburetor may be provided on a side wall of the engine cover for downsizing. It is conceivable that this notch is provided at a position where the cooling air is small in order to avoid the influence on the cooling air. For example, FIGS. 10 and 11 show examples of the shape of the engine cover 102 in the engine working machine for reference. 10 and 11, the opening for the plug is opened on the side of the engine cover 102, that is, on the same side as the carburetor. Here, the engine cover 102 has an opening 121 formed in the left side wall 102b adjacent to the front portion 102e, and a carburetor (not shown) and an insulator (not shown) penetrate the opening 121. The lower end of the left side wall 102b is an edge 121a, which moves sufficiently above the imaginary line 121c, and a fuel supply device such as an insulator or a carburetor is arranged in a space (opening 121) formed by the edge 121a. An elongated notch 122 cut out upward from the opening 121 was formed, and the plug cord was pulled out from near the upper end thereof. FIG. 11 shows this state. In FIG. 11, the plug cord 19 is pulled out from the vicinity of the uppermost part of the notch 122 formed in the engine cover 102 from the inside to the outside, and the plug cord 19 is connected to the tip. At this time, the plug cord 19 extending from the ignition coil 18 crosses the engine cover 102 at the position of the arrow 119b, and is drawn out of the engine cover 102.

JP 2014-231743 A

  When pulling out the plug cord 19, the plug cord 19 is disposed near the radiation fins 11 a of the cylinder 11, pulled out from the engine cover 102, bent, and a plug cap (not shown) is attached to the end of the plug cord 19. At this time, if the plug cord is wired with the shortest distance, the plug cord cannot be inserted into the plug. Therefore, the length of the plug cord 19 needs to have a margin. However, when the plug cord 19 is pulled out from the notch as shown in FIG. 11, the plug cord 19 attached to the plug has a slack, so that the plug cord 19 may come into contact with the radiation fins 11a of the cylinder 11 and be melted. is there.

The present invention has been made in view of the above background, and an object thereof is to provide a holding member that holds a plug cord at a predetermined position where the plug cord is pulled out from an engine cover so that the plug cord does not contact a cylinder. An object of the present invention is to provide a structured engine working machine.
Another object of the present invention is to provide an engine working machine configured to move a plug cord withdrawal position so that the plug cord does not contact a radiation fin of a cylinder.
Still another object of the present invention is to provide an engine operating machine in which the number of parts is prevented from increasing by integrally manufacturing a plug cord holding member with an insulator, and the assembling property is improved.

The features of typical inventions disclosed in the present application will be described as follows.
According to one feature of the present invention, an ignition coil disposed close to the outer periphery of a magnet rotor, an air-cooled engine having a plug cord connected to a spark plug, an engine cover covering the periphery of a cylinder, A work tool that is operated by the output of the engine, and has a structure in which the plug cord extends from the ignition coil, is pulled out of the engine cover, and is then connected to the ignition plug, and the plug cord extending from the ignition coil has The upper part of the fin is held so as to have a predetermined gap. The plug cord is pulled out in the direction orthogonal to the axial direction of the crankshaft of the engine cover, and the position where the plug cord is drawn from the engine cover is arranged adjacent to a rotating space formed by a magnet rotor also serving as a cooling fan. This drawn position is drawn outward through the engine cover on the cylinder side of the magneto rotor when viewed in the axial direction of the crankshaft.

  According to another feature of the present invention, the engine cover has a side wall surface formed below the plug mounting port and between the fuel supply device and the insulator connecting the cylinder, and the plug cord is pulled out at the intake position. The side wall surface is set on the plug side in a cutout portion cut out so as to extend from the crankcase side to the plug direction side. In addition, the movement of the plug cord toward the crankcase side is restricted by supporting the crankcase side in the notch. The notch is formed with a cord holding recess further cut out in a direction substantially orthogonal to the notch direction, and the plug cord is positioned in the recess. Further, a guide portion extended along a contour of the recess so as to have a predetermined length in a direction substantially orthogonal to the surface of the engine cover is provided.

  According to still another feature of the present invention, the cylinder and the fuel supply device are connected by an insulator having an intake passage, and a pressing member that regulates the movement of the plug cord toward the crankcase is provided on the insulator. This pressing member covers the opening of the cutout portion other than the position where the plug cord arranged in the cutout portion is held. Further, a guide portion that is extended to have a predetermined length in the longitudinal direction of the plug cord is provided at a portion of the pressing member that contacts the plug cord. Further, the insulator and the holding member are integrally manufactured by molding a synthetic resin.

According to the present invention, the plug cord can be pulled out at a position away from the radiation fins of the cylinder without affecting the side wall portion of the volute-shaped fan chamber that generates cooling air. However, it is possible to realize an engine working machine with excellent durability without being melted. In addition, since the position of the plug cord is limited by using the insulator, the plug cord can be correctly routed during reassembly such as maintenance, and the position of the plug cord can be prevented from being shifted during the work. Further, it is possible to prevent air leakage from the space inside the engine cover to the outside, and to realize an engine working machine with an improved cooling effect. Furthermore, since the pulling out of the plug cord from the ignition coil to the outside of the engine cover does not interfere with the cooling fan chamber, there is no fear of disturbing the flow of air flowing from the fan chamber to the cylinder side, thereby enhancing the engine cooling effect. be able to.
The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

It is a front view of the engine part of engine working machine 1 in the example of the present invention. FIG. 2 is a front view in which a position of an engine 10 is added to FIG. 1 in order to explain a flow of a cooling wind CA. FIG. 2 is a perspective view illustrating an external shape of an engine cover 2 of FIG. 1. FIG. 2 is a view showing an engine cover 2 and a plug cord 19 as viewed from an AA part in FIG. 1 (the illustration of an insulator is omitted). FIG. 2 is a view showing an engine cover 2 and a plug cord 19 as viewed from an AA part in FIG. 1 (an insulator is shown). It is sectional drawing of the BB part of FIG. FIG. 3 is a perspective view showing a single shape of an insulator 40. FIG. 7 is a perspective view showing a single body shape of an insulator 80 according to a second embodiment of the present invention. It is a perspective view showing an example (a brush cutter) of an engine working machine. FIG. 4 is a perspective view showing an external shape of an engine cover 102 as a reference example. It is a side view of the engine cover 102 as a reference example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same portions are denoted by the same reference numerals, and a repeated description will be omitted. Further, in this specification, the front, rear, left, right, up and down directions are described as directions shown in the drawings.

  1 and 2 are front views of an engine part of an engine working machine according to an embodiment of the present invention. 2, the position of the engine 10 is added to FIG. Here, a housing is formed by an engine cover 2 and a fan case 3 which are the engine portion when applied to the bush cutter, and the engine 10 (see FIG. 2) is housed therein. The engine 10 is a two-cycle small engine, in which the crankshaft is arranged coaxially with the main pipe 104 (see FIG. 10), and the cylinder is substantially vertically upward from the crankcase 14 which rotatably supports the crankshaft. The piston (not shown) reciprocates in the cylinder 11 in the vertical direction. A fuel supply device such as a carburetor 35 is disposed on the left side of the cylinder 11, and an exhaust device such as a muffler 8 is disposed on the right side. The engine cover 2 is manufactured by integral molding of a synthetic resin such as plastic, and has a shape that covers the front, upper and rear sides of the cylinder of the engine and the muffler portion (right side of the engine). A carburetor 35 is provided on the left side of the engine, and an air filter portion (not shown) connected to the carburetor 35 is covered by a synthetic resin side cover 6 to form an air filter chamber (not shown). Is done. The engine 10 is arranged at a position where the crankshaft and the drive shaft 5 are coaxial, and is arranged horizontally extending in the front-rear direction.

  The periphery of the drive shaft 5 is covered by a fan case 3 made of synthetic resin. The fan case 3 and the engine cover 2 are fixed to a crankcase (not shown), the fan case 3 covers the magneto rotor 17, and the engine cover 2 covers the cylinder 11 and the ignition coil 18. Legs 4 are formed below the fan case 3 to stably hold the engine working machine 1 when the engine working machine 1 is placed on a floor or the like. A fuel tank 28 is provided below the engine portion, a fuel suction pipe 29 is connected to the carburetor 35 from the fuel tank 28, and a first return pipe 30 from a fuel return port of the carburetor 35 is connected to the primary pump 31. Then, the primary pump 31 is connected to the fuel tank 28 by the second return pipe 32. In the upper part of the engine cover 2, a plug mounting port 2 a is formed to penetrate when mounting a spark plug (not shown) and to pass a plug cap 20 to be mounted on the spark plug. The two lead wires 26 and 27 are drawn out together with the plug cord 19 connected to the plug cap. Terminals are connected to ends of the lead wires 26 and 27, and these are connected to a kill switch (not shown) for stopping the engine. The kill switch is a switch for stopping the engine by short-circuiting an ignition coil to be described later to cut off the supply of a high-voltage current for ignition to the plug cord.

  2, the flow of the cooling air CA generated by the magneto rotor 17 is indicated by arrows. The engine 10 is a so-called upright engine in which the center axis of the cylinder 11 is arranged in a vertical direction, and a piston (not shown) reciprocates vertically in the cylinder 11. A spark plug (not shown) is provided on the upper part of the cylinder 11, a muffler (not shown) is provided on the right side, and a crankshaft (not shown) is horizontally arranged so as to extend in the front-rear direction.

  A magnet rotor 17 integrally formed with a cooling fan is attached to a crankshaft (not shown) of the engine 10. The magneto rotor 17 has a function as a flywheel for suppressing rotation fluctuation of the engine 10, a part of a function for generating a high-voltage current for ignition, and a cooling air for cooling the engine 10. Performs the function of a cooling fan. The magnet rotor 17 is manufactured, for example, by integral molding of an aluminum alloy. A plurality of fins extending in the axial direction are formed in the outer peripheral portion. The outside air is sucked by the rotation of the magnet rotor 17, so that the fan chamber 7 inside the fan case 3 has The cooling air CA is formed in a predetermined direction. The cooling air CA is blown toward the plurality of radiating fins 11a of the cylinder 11 along the inner wall portion of the fan chamber 7 formed in a volute shape defined by the fan case 3 and a part of the engine cover 2.

  A magnet (not shown) is provided on a part of the outer peripheral surface of the magnet rotor 17. A high-voltage current generated by electromagnetic induction between the magnet and the ignition coil 18 is transmitted to the ignition plug 37 via the plug cord 19 and the plug cap 20. You. On the other hand, the ignition coil 18 is provided with short-circuit terminals 18a and 18b (only 18b is visible in FIG. 2) for stopping the engine 10, and a lead wire 27 is connected to the terminal 18b. Similarly, a lead wire 26 is connected to a short-circuit terminal 18a (not shown). A fuel tank 28 is provided below the crankcase 14. A mixed oil of gasoline and oil is put in the fuel tank 28, and a fuel cap 28 a is provided at an opening of the fuel tank 28.

  A centrifugal clutch 38 is provided on the front side of the magneto rotor 17, and drives a working tool (here, the rotary blade 112 in FIG. 9) via the centrifugal clutch 38 and a driving force transmission mechanism (not shown). The centrifugal clutch 38 rotates the rotary blade 112 when the rotation speed of the engine 10 increases, and shuts off the transmission of power to the rotary blade 112 when the rotation speed of the engine 10 falls below a predetermined rotation speed (the clutch connection rotation speed). A recoil starter (not shown) for starting the engine 10 is provided on the rear side of the engine 10 and on the rear end side of the crankshaft. Since a well-known recoil starter may be used, a detailed description thereof will be omitted here.

  FIG. 3 is a perspective view showing the external shape of the engine cover 2 of FIG. The engine cover 2 is manufactured, for example, by integral molding of a synthetic resin such as a plastic, and most of the side surfaces and the upper surface of the radiation fins of the cylinder 11 are covered with a wall surface separated from the cylinder 11 by a predetermined distance. . The basic shape of the engine cover 2 is the same as the engine cover 102 of the engine working machine as a reference shown in FIG. In the present embodiment, a notch 22 is provided which is elongated and cut out from the opening 21 in an elongated manner in order to pull out the plug cord 19. Further, a notch 23 is formed which is further notched toward the front from the end portion of the notch 22, that is, the upper end. The recess 23 is used to determine a position for holding the plug cord 19, and the plug cord 19 is disposed inside the recess 23 when the engine 10 is operating. A flange-like guide portion 24 extending in the longitudinal direction of the plug cord 19 is provided on the outer edge of the recess 23 in order to increase the contact area between the plug cord 19 and the engine cover 2 and prevent the plug cord 19 from being damaged. The guide portion 24 is formed so as to extend in parallel with the longitudinal direction of the plug cord 19, and is formed substantially over the entire area in contact with the plug cord 19. Therefore, the guide portion 24 is shaped like a semi-cylindrical pipe attached to the engine cover 2. But also. The guide portion 24 is manufactured integrally with the engine cover 2.

  FIG. 4 is a view of the engine 10 side viewed from the AA section in FIG. 1, and FIG. 4A is a left side view of the engine cover 2 and the fan case 3. In (1), an inner portion of the front wall of the engine cover 2 serves as a fan chamber 7 for guiding air generated by the magnet rotor 17 in a predetermined direction (a direction of hitting a radiation fin of the cylinder 11). A large number of slit-shaped wind windows 2c are formed on the rear side opposite to the cylinder 11 from the side 7 to allow the cooling air CA after cooling the cylinder 11 to pass from inside to outside. The left side of the engine cover 2, that is, the side on which the carburetor 35 is provided (the intake side) is a wall surface 2b for preventing the cooling air CA from leaking outside, and an insulator (FIG. 5) connecting the carburetor 35 and the cylinder 11 The opening 21 is formed below the wall surface 2b so as to avoid the following. Although not shown here, a muffler (not shown) is disposed near the discharge port of the cylinder by bolts on the right side surface of the cylinder 11, and between the muffler and the cylinder, a baffle plate substantially corresponding to the entire right side surface of the cylinder is provided. Provides the same function as the left wall surface 2b. As described above, the cooling air CA generated from the magneto rotor 17 flows backward from the front portion of the radiation fin 11a of the cylinder 11 by the left side wall and the wind shield plate, and is discharged to the outside through the rear window 2c.

The shape of the opening 21 is along the shape of the insulator 40, wherein so as to lower brought country are in the rear side from the front side is formed obliquely as a lower end portion 21a. If the purpose of the opening 21 is only a shape for avoiding the insulator, the upper edge on the front side may be formed in a mountain shape by the lower end 21a and the dotted line 21b as shown by a dotted line 21b. However, in the present embodiment, the plug cover 19 is connected to the ignition coil 18 and the plug cap 20 is removed from the ignition plug 37, so that the engine cover 2 can be mounted on the crankcase from above so that the engine cover 2 can be mounted on the crankcase. A notch portion 22 that is elongated and opened upward is formed. Further, in the vicinity of the end (near the upper end) of the notch 22, a recess 23 for holding the cord is further cut out in a direction (rear to front) substantially orthogonal to the notch direction (from bottom to top). did. The recess 23 accommodates the plug cord 19 and also has a small small recess 23a formed in a part thereof for allowing the two lead wires 26 and 27 to pass therethrough. Therefore, the shape of the depression 23 in a side view as shown in FIG. 4 corresponds to the shape of the plug cord 19 and the two lead wires 26 and 27. Thus, in this embodiment, the recess 23 is provided, and the plug cord 19 and the lead wires 26 and 27 are arranged therein. It should be noted that the position where the depression 23 is provided may be further lower. However, the front side of the opening 21 and the inside of the engine cover 2 serves as the fan chamber 7 for supplying the cooling air to the cylinder 11 by the rotation of the magneto rotor 17, so that the depression 23 is located as high as possible. Is more preferred. Further, disposing the depression 23 on the lower side is disadvantageous because the plug cord 19 must be lengthened.

  FIG. 4B is a diagram showing an arrangement relationship between the plug cord 19 and components such as the engine 10 housed therein. An ignition coil 18 is provided adjacent to the outer peripheral side of the magneto rotor 17. A plug cord 19 for supplying a high-voltage current to an ignition plug (not shown) is connected to the ignition coil 18 by an arrow 19a. The ignition coil 18 penetrates the recess 23 at the point indicated by the arrow 19b and is drawn out of the engine cover 2. In this way, the pull-out point of the plug cord 19 is arranged adjacent to the rotation space of the magnet rotor 17 also serving as a cooling fan, and is moved forward from the position shown in FIG. As a result, the position 19b at which the plug cord 19 is pulled out from the engine cover 2 to the outside is disposed so as to be separated upward when viewed in the up-down direction, and is disposed further away from the reference example when viewed in the front-rear direction. As a result, the risk that the plug cord 19 comes into contact with the radiation fins 11a during operation of the engine can be greatly reduced. Further, since the recess 23 is cut out from the vicinity of the upper end of the cutout portion 22 to the front side, the rear wall surface of the fan chamber 7 for guiding the cooling air CA generated by the magneto rotor 17 (dotted line 7a in FIG. 4A). ), There is no need to change the shape of the fan chamber 7 and the flow of the cooling air CA is not obstructed. Furthermore, since the notch 22, the recess 23, and the guide 24 can be easily formed by molding the engine cover 2 made of synthetic resin, an increase in manufacturing cost can be suppressed.

  FIG. 5 is a sectional view taken along the line AA of FIG. This is a diagram obtained by adding a cross-sectional view of the insulator to FIG. The insulator 40 is a connecting member for fixing the carburetor 35 (see FIG. 1) to the cylinder 11, and is a cylinder having an intake passage connecting the carburetor 35 and a suction port (not shown) of the cylinder 11. -Shaped member. In this embodiment, the insulator 40 has a square cross-sectional outer shape, and an intake passage 42 having a circular cross-sectional shape is formed in the center. Screw holes 43a and 43b for attachment are formed. The insulator 40 further includes flat portions (44 and 45, which will be described later in detail with reference to FIG. 7) that extend from the middle in the intake direction in the intake passage 42 so as to be substantially perpendicular to the intake direction. The flat plate portions (44, 45) are molded integrally with the insulator 40 made of synthetic resin, and function as a holding member for holding the plug cord 19 so as not to fall out of the recess 23, and the engine cover 2 By closing the notch 22 formed in the left side opening 21 (see FIG. 4) and the wall surface 2b, a function as a wind shield plate for preventing a part of the cooling air CA from leaking from the notch 22 to the outside. . Further, a guide portion 46 having a predetermined length in the longitudinal direction of the plug cord 19 is formed in a portion of the flat plate portion which is in contact with the plug cord 19 of the cord holding wall 45, and a guide portion formed on the engine cover 2 side. The plug cord 19 is configured to cover the plug cord 19 with a large contact area by covering the periphery of the plug cord 19 in a cylindrical shape with the guide portion 46 formed on the cord holding wall 45 side.

  FIG. 6 is a sectional view taken along the line BB of FIG. The cylinder 11 of the engine 10 is fixed to the crankcase 14 by four bolts 15a to 15d. A plurality of radiation fins 11a are stacked with a gap in the axial direction of the cylinder 11. The shape of the heat radiation fins 11a is a basic shape of a substantially square shape, but has a shape in which four corners are cut so as not to hinder the tightening work of the bolts 15a to 15d. In a portion of the radiating fin 11a that does not interfere with the tightening direction of the bolts 15a to 15d, the radiating area is increased by greatly extending to the outside in the radial direction, thereby improving the cooling effect of the cooling fan (magnet rotor 17). Let me. The plug cord 19 is pulled out from a part of the ignition coil 18, is separated from the recess 23 (see FIG. 4) by a predetermined distance from the outer edge of the radiation fin 11 a of the cylinder 11 near the arrow 48, and Drawn to. In addition, in the top view, the plug cord 19 has a positional relationship near the arrow 48 so as to interfere with the lower radiating fin 11a in a top view, but since the size of the upper radiating fin 11a is actually small, the plug cord 19 is small. It does not come into contact with the cord 19, and does not come into contact with the lower radiation fin 11a because it is separated so as to have a sufficient space in the vertical direction. As described above, since the plug cord 19 is arranged at a sufficient distance from the cylinder 11, there is no possibility that the plug cord 19 touches the radiation fins 11a due to vibration during operation of the engine. Further, the lead wires 26 and 27 are arranged further forward (toward the magnet rotor) than the plug cord 19, and the lead-out point is located inside the guide portion 24, so that the lead wires 26 and 27 come into contact with the cylinder 11. No fear.

  FIG. 7 is a perspective view showing a single shape of the insulator 40. In the insulator 40, an intake passage 42 and two screw holes 43a and 43b are formed in a prismatic body portion 41. Further, a pulse passage 43c, which is a passage extending substantially parallel to the intake passage 42, is formed below the intake passage 42. This pulse passage 43c functions as a part of a pressure pipe for transmitting the pressure of the crank chamber. Plate portions (44, 45) are formed at the engine-side end of the main body portion 41 so as to extend in a direction (radially outward) orthogonal to the axial direction of the intake passage. One of the flat plate portions is an opening closing wall 44, which fills a gap between an upper portion of the insulator 40 and a lower end portion 21a of the engine cover 2 (see FIG. 4A). The second flat plate portion is formed with a cord holding wall 45 that forms a wall portion so as to cover almost the entire opening portion of the cutout portion 22 and excludes a portion where the plug cord 19 is located. A portion near the upper end of the cord holding wall 45 and in contact with the plug cord 19 has an arc shape corresponding to the outer diameter size of the plug cord 19, and extends along a contour of the recess in a direction substantially orthogonal to the surface of the engine cover. A guide portion 46 is formed to have a predetermined length. The portion of the guide portion 46 that comes into contact with the plug cord 19 has a predetermined width along the longitudinal direction of the plug cord 19, for example, about 2 to 5 times the thickness of the cord holding wall 45, and The area of contact with the cord holding wall 45 is increased so that the plug cord 19 is not easily damaged by vibration or the like during operation of the engine. The insulator 40 is further formed with a throttle holding portion 47b for holding a throttle wire, and the throttle holding portion 47b is formed at the tip of an arm portion 47a extending from the vicinity of the base of the cord holding wall 45 to the main body portion 41.

  As described above, since the opening closing wall 44 and the cord holding wall 45 are integrally formed as a part of the insulator 40, when the engine cover 2 is attached to the engine 10, the opening closing wall 44 and the cord holding wall 45 are securely connected to the engine cover. The second opening 21 and the notch 22 are in contact with each other. In this embodiment, the cutout portion 22 and the cord holding wall 45 are flat with each other, and have a shape in which the edge portions are in contact with each other. May be configured so as to securely engage with the edge portion.

  As described above, in the present embodiment, a notch 23 is further formed in the lateral direction from the end of the notch 22 of the engine cover 2 to stably hold the plug cord 19 away from the cylinder 11. In addition, the cord holding wall 45 and the guide portion 46 can stably hold the plug cord 19 so that the plug cord 19 does not fall out of the recess 23. This can be achieved by one or both of the recess 23 and the cord holding wall 45 serving as a pressing member cooperating with each other to regulate the movement of the plug cord 19 toward the cylinder (or the crankcase). It is. In addition, since the cord holding wall 45 and the guide portion 46 are manufactured integrally with the insulator 40, there is no need to change the assembling procedure, and the present invention can be realized while suppressing an increase in manufacturing cost. Furthermore, since the opening closing wall 44 and the cord holding wall 45 are integrally formed so as not to be separated from the insulator 40, the forgetting of attaching the opening closing wall 44 and the cord holding wall 45 does not occur. Furthermore, since the position where the plug cord 19 is removed from the engine cover 2 cannot be changed, there is no possibility that when the operator removes the engine cover 2 and performs maintenance, the position where the plug cord 19 is pulled out may be changed due to an assembly error.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the first embodiment, the notch 23 is further cut out from the notch 22 on the front side, but the flat plate portions (44, 85) are also formed in the engine cover 102 shown in the reference example in which the notch 23 is not formed. By using the insulator 80 formed integrally, the plug cord 19 can be favorably held and the cooling air CA can be prevented from leaking from the notch. The insulator 80 shown in FIG. 8 is obtained by changing only a part of the insulator 40 shown in FIG. 7, that is, the shape of the cord holding wall 85 and the guide portion 86 is changed. Manufacturing these flat plate portions (44, 85) by integral molding of synthetic resin is the same, and portions having the same shape as the insulator 40 are denoted by the same reference numerals. A guide portion 86 is formed at the end (upper end) of the cord holding wall 85. The guide portion 86 is formed in an arc shape following the shape of the plug cord 19. By forming a predetermined length in the axial direction in the guide portion 86, the contact area may be increased so as to suppress rubbing or breakage due to vibration or the like. In this case, only the lower portion of the plug cord 19 at the contact portion between the plug cord 19 and the engine cover 102 is held by the arc surface of the guide portion 86, but by providing the arc surface, a reference example is provided. The contact of the plug cord 19 with the cylinder 11 which may occur in the illustrated engine working machine can be greatly reduced. As described above, the effect of the present invention can be obtained only by replacing the insulator 40 without changing the engine cover 102 (see FIG. 10).

  As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. For example, in the above-described embodiment, an example of a brush cutter was described as an example of an engine working machine. The same can be applied to the engine working machine. The same effect can be obtained even if the above-described insulators 40 and 80 and the flat plate portions (44 and 85 or 44 and 46) are formed as separate parts instead of being integrally formed.

DESCRIPTION OF SYMBOLS 1 Engine working machine 2 Engine cover 2a Plug mounting opening 2b Wall surface 2c Wind window 3 Fan case 4 Leg 5 Drive shaft 6 Side cover 7 Fan room 8 Muffler 10 Engine 11 Cylinder 11a Radiation fin 11b Mounting boss 14 Crank case 15a to 15d Bolt 16 Bolt 17 Magneto rotor 18 Ignition coil 18a Short-circuit terminal 19 Plug cord 20 Plug cap 21 Opening 21a Lower end 21b Dotted line 22 Notch 23 Depression 23a Small depression 24 Guide parts 26, 27 Lead wire 28 Fuel tank 28a Fuel cap 29 Fuel suction pipe 30 First return pipe 31 Primary pump 32 Second return pipe 35 Vaporizer 37 Spark plug 38 Centrifugal clutch 40 Insulator 42 Intake paths 43a, 43b Screw holes 43c Pal Passageway 44 Opening closing wall 45 Cord holding wall 46 Guide part 47a Arm part 47b Throttle holding part 80 Insulator 85 Cord holding wall 86 Guide part 101 Engine work machine 102 Engine cover 102b Left side wall 102e Front part 104 Main pipe 107 Throttle lever 108 Handle part 109 Sub handle 110 Engine 112 Rotary blade 113 Shatter protection cover 121 Opening 121a Edge 121c Virtual line 122 Notch CA Cooling wind

Claims (9)

A crankshaft that rotates by the reciprocating motion of the piston,
A crankcase that rotatably supports the crankshaft;
A cylinder fixed to the crankcase and formed with a plurality of fins for heat dissipation on the outer periphery, a magneto rotor fixed to one end of the crankshaft,
An ignition coil arranged close to the outer periphery of the magneto rotor,
An engine having a plug cord for connecting the ignition coil and a spark plug;
An engine cover that covers the periphery of the cylinder;
A work implement operated by the output of the engine,
An engine working machine having a structure in which the plug cord is connected to the ignition plug after being extended from the ignition coil and pulled out of the engine cover,
The engine cover has a plug mounting port for mounting the ignition plug, and an intake side wall surface is formed between the space connecting the fuel supply device to the cylinder below the plug mounting port,
A plug cord extending from the ignition coil is held above the fin with a predetermined gap ,
The lead-out position of the plug cord is set to a plug side in a cutout portion cut out so as to extend from the crankcase side of the intake side wall surface toward the ignition plug.
The plug cord, the engine working machine according to claim Rukoto movement is restricted to the crank case side by the crank case side is supported in the notch portion. The plug cord is pulled out from a wall surface of the engine cover parallel to an axial direction of the crankshaft,
2. The engine working machine according to claim 1, wherein the drawn-out position is arranged adjacent to a rotation space of the magneto rotor that also serves as a cooling fan. 3.   3. The engine working machine according to claim 1, wherein the plug cord is drawn outward through the engine cover on a cylinder side of the magneto rotor when viewed in the axial direction of the crankshaft. 4. The notch portion has a recess for holding the cord which is further notched in a direction substantially orthogonal to the notch direction, and the movement of the plug cord toward the crankcase side is regulated by the recess. The engine working machine according to any one of claims 1 to 3 , characterized in that: 5. The engine working machine according to claim 4 , further comprising a guide portion extending along a contour of the recess so as to have a predetermined length in a direction substantially orthogonal to a surface of the engine cover. 6. The cylinder and the fuel supply device are connected by an insulator having an intake passage,
The engine working machine according to any one of claims 3 to 5 , wherein a pressing member that restricts movement of the plug cord toward the crankcase is provided on the insulator. The engine working machine according to claim 6 , wherein the pressing member covers an opening of the notch other than a position where the plug cord is disposed in the notch. Wherein the said plug cord abutting portion of the holding member, according to claim 6 or 7, characterized in that extended guide portion so as to have a predetermined length in the longitudinal direction of the plug cord is provided Engine working machine. The engine working machine according to any one of claims 6 to 8 , wherein the insulator and the pressing member are integrally manufactured by molding a synthetic resin.

Images