Electric power shovels and methods of assembling the same

Abstract

The present application provides an electric power machine and an assembling method thereof, which can be easily assembled without special jigs, and can reduce working hours and manufacturing costs. The motor assembly is inserted into the main body case, the mounting table portion is arranged at the rear of the partition wall portion, and the tubular fixing portion is protruded to the front side of the partition wall portion through the insertion hole. The motor assembly is temporarily fixed by the temporary fixing mechanism portion. In the temporary fixing state, the bolt is screwed into the threaded hole of the mounting table portion through the through hole, thereby performing the formal fixing of the motor assembly. In the temporary fixing, the motor assembly is automatically moved in two directions orthogonal to the surface along the partition wall portion and in the rotation direction to keep the position of the motor assembly, so that the tubular fixing portion and the insertion hole are coaxial, and the through hole and the threaded hole of the mounting table portion for screwing the bolt are coaxial.

Description

Technical Field

[0001] The present invention relates to an electric working machine such as a lawn mower, a hedge trimmer, a chain saw, etc. which uses an electric motor as a working power source, and an assembling method thereof. Background Art

[0002] A portable electric working machine that uses an electric motor (hereinafter referred to as a motor) as a power source for working is generally also as seen in patent documents 1, 2, 3, etc., and comprises: a motor as a power source for working; a main body shell made of synthetic resin, in which the motor is built; an operating rod, which has a working part on the front end side and is fixed to the main body shell on the base end side; and a rod fixing member (also called a jig) for fixing the base end portion of the operating rod to the above-mentioned main body shell.

[0003] In such an electric working machine, the main body shell is a split structure (usually a structure divided into two parts on the left and right). When assembling the electric working machine, the motor, rod fixing parts and other components are individually fastened to one side of the half shell by multiple bolts, and after the wiring / wiring operation, the other half of the shell is embedded and fixed to one side.

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2014-239704

[0005] Patent Document 2: Japanese Patent Application Laid-Open No. 2010-200673

[0006] Patent Document 3: Japanese Patent Application Laid-Open No. 2014-147398

[0007] During this assembly process, it is necessary to align (center) the motor (its rotating drive shaft), rod fixture, operating lever (the transmission shaft built into the operating lever), etc. Conventional electric working machines require operators to carefully align (center) multiple components while using jigs to confirm their positional relationships. This can be a time-consuming and labor-intensive assembly process. Summary of the Invention

[0008] The present invention has been made in view of the above circumstances, and an object thereof is to provide an electric working machine and an assembling method thereof that can be assembled simply and easily without requiring special jigs, thereby reducing man-hours and manufacturing costs.

[0009] In order to achieve the above-mentioned purpose, the electric working machine involved in the present invention basically comprises: a motor as a power source for working; a main body shell, in which the motor is built into the main body shell with a posture facing the front-back direction; an operating rod, in which the working part is arranged; and a rod fixing member for installing and fixing the operating rod to the main body shell.

[0010] The rear end of the main body shell is provided with a partition wall portion, and the partition wall portion is provided to separate the front and rear ends of the main body shell, and the rod fixing part comprises: a mounting platform portion, the mounting platform portion is arranged at the rear of the partition wall portion and is fastened to the partition wall portion by at least one bolt, and the at least one bolt is screwed into the partition wall portion from the front side toward the rear side through the through hole provided in the partition wall portion; and a tubular fixing part for fixing the base end portion of the operating rod, the tubular fixing part protruding from the mounting platform portion to the front of the partition wall portion through the insertion hole provided in the partition wall portion, and the rod fixing part is assembled and fixed to the motor to form a motor assembly. Before the mounting platform portion of the rod fixing member in the motor assembly is formally fixed to the partition wall portion, when the mounting platform portion is arranged behind the partition wall portion and the tubular fixing portion is protruded to the front side of the partition wall portion through the insertion hole, the tubular fixing portion and the insertion hole become coaxial, and the through hole becomes coaxial with the threaded hole of the mounting platform portion for the bolt to be screwed in. The electric working machine is provided with a temporary fixing mechanism portion on the portion of the tubular fixing portion that protrudes to the front of the partition wall portion and on the partition wall portion, and the temporary fixing mechanism portion automatically moves the motor assembly relative to the main body housing in two directions orthogonal to the surface of the partition wall portion and in the rotational direction to maintain the position of the motor assembly.

[0011] In a preferred embodiment, the temporary fixing mechanism portion includes a plurality of interlocking portions and a plurality of supporting sheet portions, the plurality of interlocking portions are arranged on the tubular fixing portion at intervals of a specified angle, the plurality of supporting sheet portions are arranged on the partition wall portion corresponding to the plurality of interlocking portions, the plurality of supporting sheet portions are elastically pressed against the side surfaces of the tubular fixing portion, and can be interlocked with the interlocking portions.

[0012] In other preferred embodiments, the temporary fixing mechanism portion includes a plurality of interlocking portions and a plurality of supporting sheet portions, the plurality of interlocking portions are arranged at predetermined angle intervals on the thick-walled portion of the tubular fixing portion, and have an interlocking recessed portion that is recessed forward and has an elliptical arc or mountain-shaped shape when viewed from the side, the plurality of supporting sheet portions are arranged on the partition wall portion corresponding to the plurality of interlocking portions, the plurality of supporting sheet portions protrude obliquely forward from the partition wall portion, and the front ends of the plurality of supporting sheet portions have an interlocking convex portion that has an elliptical arc or mountain-shaped shape when viewed from the side, the interlocking convex portion is elastically pressed against the side surface of the tubular fixing portion, and can be interlocked with the interlocking concave portion.

[0013] In another preferred embodiment, an air guide partition component having a housing recess and a partition plate portion is fixed to the motor assembly, the housing recess covers at least a portion of a fan housing arranged at the rear of the motor, the partition plate portion airtightly separates the exhaust port and the air intake port arranged at a prescribed interval in the front-to-back direction in the main body casing, and an air guide window is provided on the partition plate portion, and the air guide window is used to transport the cooling air sucked in from the air intake port to the opening on the front side of the motor.

[0014] On the other hand, the assembly method of the electric working machine according to the present invention is characterized in that the motor assembly is relatively inserted into the main body housing, the mounting platform is arranged behind the partition wall, and the tubular fixing portion is protruded to the front side of the partition wall through the insertion hole, and is temporarily fixed by the temporary fixing mechanism. In this temporarily fixed state, the at least one bolt is screwed into the threaded hole of the mounting platform through the through hole, thereby formally fixing the motor assembly. During the temporary fixation, the motor assembly is automatically moved relative to the main body housing in two directions orthogonal to the surface of the partition wall and in the rotational direction to maintain the position of the motor assembly, so that the tubular fixing portion and the insertion hole become coaxial, and the through hole and the threaded hole of the mounting platform for the bolt to be screwed into become coaxial.

[0015] Effects of the Invention

[0016] According to the electric working machine and the assembling method thereof of the present invention, since the motor and the rod fixing member are integrated into a motor assembly and handled as a single item, the assembly work can be simplified and accelerated.

[0017] In addition, since the motor assembly can be temporarily fixed to the main housing and the main housing and the motor assembly are automatically aligned (centered) during temporary fixation, there is no need for operators to hold the motor assembly or align the various parts as in the past. In addition, since no special jig is required, the assembly operation can be performed simply and easily, which can effectively reduce working hours and manufacturing costs.

[0018] In addition, the motor assembly can be mounted on the main body housing by simply screwing in bolts from the outside of the main body housing, making assembly work easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a perspective view showing a common machine body and three types of replacement working parts of an embodiment of the electric working machine according to the present invention.

[0020] Figure 2 It is from Figure 1The front end of the main body housing of the electric working machine shown is a perspective view showing the interior thereof with the cover removed.

[0021] Figure 3 It will Figure 1 The illustrated electric working machine is a perspective view showing the interior of the electric working machine with the vicinity of the base end portion of the operating lever and the front portion of the main body housing cut away.

[0022] Figure 4 It shows Figure 1 A longitudinal sectional view of a base end portion of an operating lever and a front half of a main body portion of the electric working machine shown.

[0023] Figure 5 yes Figure 4 An oblique front perspective view of the motor assembly shown.

[0024] Figure 6 yes Figure 4 An oblique rear perspective view of the motor assembly shown.

[0025] Figure 7 It is composed of Figure 4 The motor assembly shown is an exploded perspective view of the rod fixing member, the motor, and the air guide partition member as viewed obliquely from the front.

[0026] Figure 8 It is composed of Figure 4 The motor assembly shown is an exploded perspective view of the rod fixing member, motor, control substrate, and air guide partition member as viewed from the oblique rear.

[0027] Figure 9 Is used to illustrate Figure 1 FIG. 1 is a diagram showing an assembly process (part 1) of the main body portion of the electric working machine.

[0028] Figure 10 It shows Figure 9 A perspective view of the main body portion after the assembly process (part 1) is completed.

[0029] Figure 11 Is used to illustrate Figure 1 FIG. 2 is a diagram showing an assembly process (part 2) of the main body portion of the electric working machine shown.

[0030] Figure 12 Is used to illustrate Figure 1 FIG. 3 is a diagram showing an assembly process (part 3) of the main body portion in the electric working machine shown.

[0031] Figure 13 Is used to illustrate Figure 9 The schematic diagram of the temporary fixing mechanism shown is a schematic diagram of the structure of the temporary fixing mechanism.

[0032] Figure 14 Is used to illustrate Figure 9A perspective view showing the effect of the temporary fixing mechanism shown.

[0033] Figure 15 It shows Figure 9 A schematic side view of another example (part 1) of the temporary fixing mechanism portion shown.

[0034] Figure 16 It shows Figure 9 A schematic side view of another example (part 2) of the temporary fixing mechanism portion shown.

[0035] Figure 17 It shows Figure 9 A schematic side view of another example (part 3) of the temporary fixing mechanism portion is shown.

[0036] Figure 18 It shows Figure 9 A schematic side view of another example (No. 4) of the temporary fixing mechanism portion is shown.

[0037] Figure 19 Is used to illustrate Figure 1 An overall longitudinal sectional view of the air flow in the main body of the electric working machine shown.

[0038] Description of Reference Numerals

[0039] 1…Electric working machine; 10…Common machine body; 11…Operating lever; 20…Main body; 21…Exhaust port; 22…Intake port; 23…Main housing; 24…Partitioning wall; 25…Motor assembly; 26…Through hole; 27…Through hole; 28…Bolt; 29…Supporting piece; 29a…Engineer projection; 30…Motor; 33…Rotating drive shaft; 34…Fan housing; 36…Opening for air intake; 39…Temporary fixing mechanism; 40…Rod fixing member; 42…Mounting Table portion; 44…tubular fixing portion; 45…threaded hole; 47…thick-walled portion (flange-shaped portion); 49…fitting portion; 49a…fitting recess; 50…replacement operation portion; 60…air guide partition component; 62…partition plate portion; 63…accommodating recess; 64…air guide window; 66…space; 67…guide component; 80…control board; 82…capacitor; 84…connector; 85…cooling fin; 88…storage portion for ferrite electromagnetic wave absorber; 90…battery; 92…battery case. DETAILED DESCRIPTION

[0040] Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

[0041] The structure of electric working machine

[0042] Figure 11 is a perspective view showing a common machine body 10 and three types of replacement working parts (also referred to as attachments) 50 ( 51 , 52 , 53 ) of an electric working machine 1 according to an embodiment of the present invention. Figure 2 It is from Figure 1 A perspective view showing the interior of the main housing 23 of the electric working machine 1 with the cover 13 removed from the front end thereof. Figure 3 It will Figure 1 A perspective view showing the interior of the electric working machine 1 with the vicinity of the base end portion 11a of the operating lever 11 and the front portion of the main body housing 23 cut away. Figure 4 It shows Figure 1 A longitudinal sectional view of the base end portion 11 a of the operating lever 11 and the front half of the main body 20 in the electric working machine 1 is shown in FIG.

[0043] The electric working machine 1 of the illustrated embodiment includes a common machine body 10 and a working unit 50 (51, 52, 53). The common machine body 10 includes a motor 30 as a power source for working, and the working unit 50 (51, 52, 53) is detachable from the common machine body 10. The common machine body 10 includes a main body 20 having a main body housing 23 made of synthetic resin, the main body housing 23 being a single cylindrical body with open front and rear ends and increasing in width from the front end to the rear end (rear), and the motor 30 is built into the main body housing 23 in a posture facing the front-to-back direction; and an operating lever 11 (specifically, a main operating lever 11A constituting the base or rear half of the operating lever 11) formed of a straight pipe, the base end of which is fixedly attached to the front end of the main body 20. The cover 13 , the grip 14 , the hand lever 15 and the like covering the front end of the main body housing 23 are integrally provided on the base end side of the operating rod 11 , and a fan-shaped ring handle 17 is attached to the front side thereof.

[0044] Furthermore, in the operating rod 11, the transmission shaft 12 is supported by the bearing 58 ( Figure 4 ) is configured in a supported state, and the transmission shaft 12 is used to transmit the rotational driving force of the motor 30 to the working part 50 provided on the front end side of the operating rod 11.

[0045] The working unit 50, on the other hand, includes multiple (only three shown here) interchangeable working units (attachments) 51, 52, and 53. In the illustrated example, the working unit 51 functions as a brush cutter, the working unit 52 as a hedge trimmer, and the working unit 53 as a chainsaw. Each working unit 51, 52, and 53 includes an operating lever 11 (specifically, a detachable operating lever 11B, which constitutes the front end or front half of the operating lever 11) and a transmission shaft 12. These can be freely attached and detached via a connecting fixture 18 provided at the front end of the main operating lever 11A and a transmission connector (not shown).

[0046] In the cylindrical main body housing 23, a partition wall portion 24 is provided near the front end thereof to partition the main body housing 23 into front and rear portions. A motor assembly 25 is mounted and fixed on the partition wall portion 24. The motor assembly 25 is formed by Figures 5 to 8 The motor 30 shown, a control board 80 for controlling the motor 30 and the like, a rod fixing member (also called a jig) 40 for fixing the base end portion 11a of the operating rod 11 to the main body housing 23, and an air guide partition member 60 are integrated into one.

[0047] A base 32 with a bearing is fixed to the front side of the short cylindrical main body 31 of the motor 30, and a rotating drive shaft 33 protrudes forward from the base 32. In addition, a fan housing 34 is provided on the rear side of the short cylindrical main body 31 in a manner that covers the cooling fan (blades) provided at the rear of the rotating drive shaft 33. Here, the short cylindrical main body 31 and the fan housing 34 are assembled by locking the door-shaped engaging portion 37 provided at the front end of the fan housing 34 with hooks 38 provided at four locations at the rear end (towards the rear) of the short cylindrical main body 31. The lower part of the fan housing 34 becomes an air outlet 34a facing the exhaust port 21 provided in the main housing 23. The front side portion of the short cylindrical main body 31 in the motor 30 other than the base 32 becomes an opening 36 for the cooling fan to inhale air.

[0048] A rod fixing member 40 (its mounting base 42) is fastened to the base 32 of the motor 30 (i.e., the front side of the motor 30) with three bolts 41. The rod fixing member 40 includes a rectangular thick plate-shaped mounting base 42, which is arranged behind the partition wall 24 of the main body housing 23 and is pressed against the partition wall 24 from the rear side of the main body housing 23. The mounting base 42 is fastened to the partition wall 24 by four bolts 28, which are screwed from the front side of the partition wall 24 toward the rear side through four through-holes 27 provided in the partition wall 24. A tubular fixing portion 44 is provided to fasten the base end portion 11a of the operating rod 11. The tubular fixing portion 44 protrudes from the center of the mounting base 42 and protrudes toward the front of the partition wall 24 through a key-shaped insertion hole 26 provided in the partition wall 24. The tubular fixing portion 44 is formed as a single-bolt narrow fastener 46 having a slit-shaped cutout portion 46a formed on the upper portion. Threaded holes 45 are provided at the four corners of the mounting base portion 42 for screwing the four bolts 28 therein.

[0049] The base end portion 12a of the transmission shaft 12 built into the operating rod 11 is connected and fixed to the rotation drive shaft 33 of the motor 30 disposed in the tubular fixing portion 44 via a coupling 57 (see Figure 4 ).

[0050] Here, the following structure is added in this embodiment so that when the electric working machine 1 (the common body portion 10) is assembled, the tubular fixing portion 44 and the insertion hole 26 (operating rod 11) in the partition wall portion 24 become coaxial, and the through holes 27 for the four bolts 28 in the partition wall portion 24 become coaxial with the threaded holes 45 of the mounting base portion 42 for screwing the bolts 28.

[0051] That is, the following temporary fixing mechanism part 39 is provided: before the mounting platform part 42 of the rod fixing part 40 in the motor assembly 25 is formally fixed to the partition wall part 24 by means of four bolts 28, when the mounting platform part 42 is arranged at the rear of the partition wall part 24, the tubular fixing part 44 protrudes toward the front side of the partition wall part 24 through the insertion hole 26 of the partition wall part 24, and at the same time, when the mounting platform part 42 is pressed against the partition wall part 24 from the rear side of the partition wall part 24, the temporary fixing mechanism part 39 automatically moves the motor assembly 25 relative to the main body housing 23 in two directions orthogonal to the surface (parallel surface) along the partition wall part 24 and in the rotational direction to maintain the position of the motor assembly 25.

[0052] Specifically, the temporary fixing mechanism portion 39 includes a plurality of (here a pair of left and right) interlocking portions 49, 49 and a pair of left and right support pieces 29, 29. The plurality of interlocking portions 49, 49 are arranged at predetermined angular intervals (here 180 degrees) on the rear surface of a thick-walled portion (flange-shaped portion) 47 formed at the front end of the tubular fixing portion 44 (that is, the portion of the tubular fixing portion 44 that protrudes in front of the partition wall portion 24). The pair of left and right support pieces 29, 29 are arranged on the peripheral portion of the insertion hole 26 in the partition wall portion 24 corresponding to the pair of left and right interlocking portions 49, 49.

[0053] The rear surfaces of the pair of left and right fitting portions 49, 49 form fitting recesses 49a, 49a that are recessed forward and have an elliptical arc or mountain shape in a side view.

[0054] The front ends (surfaces) of the left and right pair of support pieces 29, 29 are formed into elliptical arc or mountain-shaped fitting protrusions 29a, 29a that can fit into the fitting recesses 49a, 49a of the fitting parts 49, 49 when viewed from the side. Figure 13 As shown in the left figure, the left and right pair of support pieces 29, 29 project obliquely forward (inwardly inclined) from the peripheral edge of the insertion hole 26 in the partition wall portion 24 in a mirror-symmetrical manner with their front ends close to each other. In the natural state (the state before temporary fixation), if the distance between the front ends of the left and right pair of support pieces 29, 29 is La, the diameter of the tubular fixing portion 44 (the trunk) is Lb, and the diameter of the thick wall portion (flange-shaped portion) 47 is Lc, then La <Lb<Lc( Figure 13)Or Lb < La < Lc. Thus, when the mounting table portion 42 is disposed behind the partition wall portion 24 and the tubular fixing portion 44 protrudes forward of the partition wall portion 24 through the insertion hole 26 of the partition wall portion 24, while pressing the mounting table portion 42 against the partition wall portion 24 from the rear side of the partition wall portion 24, as shown in the right figure of Figure 13 , the support piece portions 29, 29 are elastically expanded by the tubular fixing portion 44, the front ends thereof are elastically crimped to the side surface of the tubular fixing portion 44, and finally, the fitting convex portions 29a, 29a at the front ends are fitted into the fitting concave portions 49a, 49a of the fitting portions 49, 49 (to be described in detail below).

[0055] It should be noted that the shapes of the rear surface of the fitting portion 49 and the front end surface of the support piece portion 29 may also be opposite. That is, it may also be that the rear surface of the fitting portion 49 is a fitting convex portion 49b that is an elliptical arc when viewed from the side, and the front end surface of the support piece portion 29 is a fitting concave portion 29b that is an elliptical arc and recessed backward when viewed from the side ( Figure 15 ). Or, it may also be that the rear surface of the fitting portion 49 is a fitting convex portion 49c that is a mountain shape when viewed from the side, and the front end surface of the support piece portion 29 is a fitting concave portion 29c that is a mountain shape and recessed backward when viewed from the side ( Figure 16 ).

[0056] In addition, in this example, the fitting portions 49, 49 are provided on the thick wall portion (flange-shaped portion) 47 (the rear surface thereof) of the tubular fixing portion 44, but the fitting portions 49, 49 may also be provided outside the thick wall portion (flange-shaped portion) 47 of the tubular fixing portion 44. For example, the fitting portion 49 may also be formed on the side surface of the tubular fixing portion 44, and the fitting portion 49 has a fitting concave portion 49d that is an elliptical arc or a mountain shape and recessed forward and has the same shape as that in this example on the back side ( Figure 17 ). Or, the fitting portion 49 may also be formed on the side surface of the tubular fixing portion 44 and is composed of a protrusion that is a circular shape when viewed from the side ( Figure 18 ). In the case of the example shown in Figure 18 , the rear surface of the fitting portion 49 is a fitting convex portion 49e that is an elliptical arc when viewed from the side, and the front end surface of the support piece portion 29 is a fitting concave portion 29e that is an elliptical arc and recessed backward when viewed from the side.

[0057] The air guide partition member 60 constituting the rear portion of the motor assembly 25 is made of, for example, synthetic resin and comprises: a housing recess 63 covering at least the upper half of the fan housing 34 provided at the rear portion of the motor 30 (the portion located in front of the roughly fan-shaped air guide window 64 described below); and a partition plate portion 62 for roughly airtightly separating the exhaust port 21 and the intake port 22 provided at a predetermined interval in the front-to-rear direction at the bottom 23b of the main housing 23 (the portion further back than the partition wall portion 24). An air guide window 64 is provided on the upper portion of the partition plate portion 62 (the upper side of the housing recess 63 in the partition plate portion 62). The air guide window 64 is used to convey the cooling air sucked in from the intake port 22 through the space 66 between the motor 30 and the main housing 23 to the air intake opening 36 on its front side (see in particular). Figure 4 、 Figure 19 ). Here, the assembly and fixation of the air guide partition component 60 to the back side of the motor 30 is performed by screwing a bolt 69 from the back side of the partition plate portion 62 into the fan housing 34. It should be pointed out that, instead of or in addition to the assembly and fixation using the bolt 69, the air guide partition component 60 can be assembled to the back side of the motor 30 by snap fitting or the like. In addition, three recesses 68 are provided on the outer surface of the front end of the accommodating recess 63, and the recesses 68 are used to avoid interference with the hook 38 of the short cylindrical main body 31 (the portion protruding rearward from the door-shaped engaging portion 37 of the fan housing 34).

[0058] Furthermore, the partition plate portion 62 has a shape that is substantially identical to (the inner circumference of) the main housing 23. The outer circumference of the partition plate portion 62 abuts against the inner circumference of the main housing 23, and the main housing 23 is reinforced by the partition plate portion 62 and is less likely to sag. A ferrite electromagnetic wave absorber storage portion 88 is provided on the back side of the partition plate portion 62.

[0059] A control board 80 is positioned upright on the back side of the partition plate 62, located between the exhaust port 21 and the intake port 22. The control board 80 is equipped with a microcomputer comprising FETs, ROM, RAM, and input / output circuits, and is also equipped with other necessary electronic components such as capacitors 82 and connectors 84. The FETs, capacitors 82, and other components, which are exposed to high temperatures, are located on the lower portion of the control board 80 near the intake port 22, and a cooling fin 85 covers the FETs.

[0060] Furthermore, a guide member 67 with open top and bottom portions is integrally formed on the partition plate portion 62 of the air guide partition member 60 so as to cover the periphery (side and rear surfaces) of the FETs (cooling fins 85) and capacitors 82, which are exposed to high temperatures. The lower portion of the guide member 67 is expanded (relative to the upper portion) to allow more cooling air from the air intake 22 to pass through the FETs (cooling fins 85) and capacitors 82, which are exposed to high temperatures.

[0061] A battery case 92 (see FIG. 1 ) housing a battery 90 is fixed to the rear of the main housing 23 (i.e., the rear side of the motor assembly 25) using a required number of bolts 93. Figure 1 、 Figure 11 ).

[0062] How to assemble an electric working machine

[0063] Next, a method of assembling (the main body 20 of) the electric working machine 1 configured as described above, particularly an example of a process of assembling the motor assembly 25 to the main body housing 23 will be described.

[0064] First, if Figure 9 As shown, the main housing 23 is set to a posture with the front side facing downward, and the motor assembly 25 is set to the rod fixing member 40 side facing downward, so that the shape of the inside of the main housing 23 is consistent with the shape of the motor assembly 25 (the partition plate portion 62 of the air guide partition member 60) and the motor assembly 25 is inserted into the main housing 23 relative to each other, and the mounting platform portion 42 is pressed against the partition wall portion 24. Figure 13 As shown in the right figure of FIG, the support pieces 29, 29 are elastically expanded by the tubular fixing portion 44, and their front ends are elastically pressed against the side surfaces of the tubular fixing portion 44, and the fitting protrusions 29a, 29a at the front ends are embedded in the fitting recesses 49a, 49a of the fitting portions 49, 49, thereby temporarily fixing (temporarily attaching) the motor assembly 25 to the main housing 23 (see FIG. Figure 10 ).

[0065] In this case, if Figure 14 As shown in the left figure, even if the fitting protrusions 29a, 29a and the fitting recesses 49a, 49a are not accurately fitted, after that, the control board 80 is connected and the wiring process is performed in the state where the motor assembly 25 is inserted into the main body housing 23 as described above. Figure 11 As shown, after the battery case 92 is fastened to the main body housing 23 by the required number of bolts 93, as shown in FIG. Figure 12 As shown in FIG. 1 , when the main body housing 23 (main body 20) is turned over, Figure 14As shown in the right figure, the sliding integration of the interlocking recesses 49a, 49a and the interlocking protrusions 29a, 29a constituting the temporary fixing mechanism 39 allows the interlocking recesses 49a, 49a to be reliably and accurately interlocked with the interlocking protrusions 29a, 29a. Accordingly, the motor assembly 25 automatically moves in two directions perpendicular to the plane (parallel plane) along the partition wall 24, as well as in the rotational direction. This aligns the axis Jb of the tubular fixing portion 44 with the axis Ja of the insertion hole 26 (operating rod 11), and aligns the axis Ka of the through-holes 27 of the four bolts 28 in the partition wall 24 with the axis Kb of the threaded holes 45 of the mounting platform 42 into which the bolts 28 are screwed (i.e., alignment is achieved). This eliminates positional deviation between the main housing 23 and the motor assembly 25.

[0066] Therefore, if Figure 12 As shown, when four bolts 28 are screwed into the threaded holes 45 through the through holes 27 to fix (permanently fix) the motor assembly 25 to the partition wall portion 24, the through holes 27 and the threaded holes 45 are aligned, making the screwing operation easy.

[0067] Similarly, since the tubular fixing portion 44 (the rotation drive shaft 33 of the motor 30) and the insertion hole 26 (the operating rod 11 and the transmission shaft 12) are concentric, the tubular fixing portion 44 and the operating rod 11 (main operating rod 11A) can be easily connected, and the rotation drive shaft 33 and the transmission shaft 12 can be easily connected.

[0068] Effects

[0069] As can be seen from the above description, in the electric working machine 1 of this embodiment, the four components, namely the motor 30, the control board 80, the rod fixing member 40 and the air guide partition member 60, are integrated into the motor assembly 25 and handled as one item, thereby simplifying and speeding up the assembly work.

[0070] In addition, the motor assembly 25 can be temporarily fixed to the main housing 23, and the main housing 23 and the motor assembly 25 are automatically aligned (centered) when temporarily fixed. Therefore, there is no need for operators to hold the motor assembly 25 or align the various parts as in the past. In addition, no special jigs are required, so the assembly operation can be performed simply and easily, which can effectively reduce working hours and manufacturing costs.

[0071] In addition, the motor assembly 25 can be assembled to the main body housing 23 simply by screwing the bolts 28 from the outside of the main body housing 23 , thus facilitating the assembly work.

[0072] Furthermore, when it is necessary to remove the motor assembly 25 from the main housing 23 for maintenance or replacement of parts, the support piece 29 can be expanded with a finger or the like after removing the bolt 28. The support piece 29 can also be reused when reinstalling the motor assembly 25 after removal. Furthermore, the support piece 29 can be cut off when it is no longer needed.

[0073] In addition, as described above, an air guide partition member 60 is provided at the rear of the main body housing 23, thereby Figure 19 As shown, the cooling air sucked in from the air intake 22 rises while cooling the cooling fins 85 and the capacitor 82 to a high temperature, passes through the air guide window 64 on the upper portion of the partition plate 62, and passes through the space 66 between the motor 30 and the main body housing 23, and is discharged from the air intake opening 36 on the front side of the motor 30 (see FIG. Figure 7 ) is sucked into the motor 30 and blown out from the exhaust outlet 34a toward the exhaust port 21 by the cooling fan.

[0074] In this embodiment, the exhaust port 21 and the intake port 22 are separated by an air guide partition component 60, so that the low-temperature intake air is not easily mixed with the high-temperature exhaust gas, and a control substrate 80 is arranged on the back side of the partition plate portion 62. The cooling air from the intake port 22 can easily blow to the electronic components that have become high-temperature, so that the control substrate 80 can be efficiently cooled, and the electronic components (capacitor 82, etc.) installed on the control substrate 80 are not easily degraded by heat.

[0075] Furthermore, the exhaust port 21 and the intake port 22 are provided at the bottom 23 b of the main body casing 23 , thereby preventing dust and rainwater from entering the main body casing 23 .

[0076] It should be noted that in the above-mentioned embodiment, an electric working machine having a common body part and a replaceable working part (attachment) is shown as an example of a portable electric working machine, but the electric working machine is not limited to this, and may also be an ordinary lawn mower, hedge trimmer, chain saw, etc. that does not have a replaceable working part (in other words, the working part cannot be replaced).

Claims

1. An electric working machine comprising: a motor as a power source for working; a main body housing, wherein the motor is built into the main body housing with a posture facing the front-back direction; an operating lever, wherein a working part is provided on the operating lever; and a lever fixing member for fixing the operating lever to the main body housing, wherein the electric working machine is characterized in that The main body shell is a single cylindrical body with openings at the front and rear ends and provided with a partition wall portion, wherein the partition wall portion is provided to separate the front and rear ends of the main body shell. The rod fixing member includes: a mounting platform portion, the mounting platform portion is arranged at the rear of the partition wall portion and is fastened to the partition wall portion by at least one bolt, the at least one bolt being screwed from the front side of the partition wall portion toward the rear side through a through hole provided in the partition wall portion; and a tubular fixing portion for fixing the base end portion of the operating rod, the tubular fixing portion protruding from the mounting platform portion to the front of the partition wall portion through the insertion hole provided in the partition wall portion. The rod fixing member is assembled and fixed to the motor to form a motor assembly. The at least one bolt is configured to prevent the mounting base of the rod fixing member in the motor assembly from being formally fixed to the partition wall portion by means of the at least one bolt, so that when the mounting base is arranged behind the partition wall portion and the tubular fixing portion protrudes toward the front side of the partition wall portion through the insertion hole, the tubular fixing portion and the insertion hole become coaxial, and the through hole becomes coaxial with the threaded hole of the mounting base portion into which the bolt is screwed, the electric working machine is provided with a temporary fixing mechanism portion on the portion of the tubular fixing portion that protrudes toward the front of the partition wall portion and on the partition wall portion, the temporary fixing mechanism portion automatically moving the motor assembly relative to the main body housing in two directions orthogonal to the plane of the partition wall portion and in the rotational direction to maintain the position of the motor assembly, The temporary fixing mechanism portion includes a plurality of interlocking portions and a plurality of supporting sheet portions, the plurality of interlocking portions being arranged at intervals of a specified angle on the tubular fixing portion, the plurality of supporting sheet portions being arranged on the partition wall portion corresponding to the plurality of interlocking portions, the plurality of supporting sheet portions being elastically pressed against the side surfaces of the tubular fixing portion and being capable of interlocking with the interlocking portions.

2. The electric working machine according to claim 1, characterized in that The temporary fixing mechanism portion includes a plurality of interlocking portions and a plurality of supporting pieces. The plurality of interlocking portions are arranged at predetermined angle intervals on the thick-walled portion of the tubular fixing portion, and have an interlocking recessed portion that is recessed forward and has an elliptical arc or mountain-shaped shape when viewed from the side. The plurality of supporting pieces are arranged on the partition wall portion corresponding to the plurality of interlocking portions. The plurality of supporting pieces protrude obliquely forward from the partition wall portion. The front ends of the plurality of supporting pieces have an interlocking convex portion that has an elliptical arc or mountain-shaped shape when viewed from the side. The interlocking convex portion is elastically pressed against the side surface of the tubular fixing portion and can be interlocked with the interlocking concave portion.

3. The electric working machine according to claim 1 or 2, characterized in that: An air guide partition component having a housing recess and a partition plate portion is fixed to the motor assembly, the housing recess covers at least a portion of a fan housing arranged at the rear of the motor, the partition plate portion airtightly separates the exhaust port and the air intake port arranged at a specified interval in the front-to-back direction in the main body casing, and an air guide window is provided on the partition plate portion, the air guide window being used to transport cooling air sucked in from the air intake port to the opening on the front side of the motor.

4. An assembly method for an electric working machine, for assembling the electric working machine according to claim 1, wherein the assembly method is characterized in that: The motor assembly is relatively inserted into the main housing, the mounting platform is arranged behind the partition wall, and the tubular fixing portion is protruded to the front side of the partition wall through the insertion hole, and is temporarily fixed by the temporary fixing mechanism. In this temporarily fixed state, the at least one bolt is screwed into the threaded hole of the mounting platform through the through hole, thereby formally fixing the motor assembly. During the temporary fixation, the motor assembly is automatically moved relative to the main housing in two directions orthogonal to the surface of the partition wall and in the rotation direction to maintain the position of the motor assembly, so that the tubular fixing portion and the insertion hole become coaxial, and the through hole and the threaded hole of the mounting platform for the bolt to be screwed into become coaxial.

Images