JP2014147353A - Electric lawn mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase convenience and handleability of a high-output electric lawn mower by using a battery for a low-output electric lawn mower as an electric power source of the high-output electric lawn mower.SOLUTION: An electric lawn mower comprises: a lawn mower main body 12 having a motor storage chamber 35; an electric motor 32 placed in the motor storage chamber 35; a trimming blade 37 rotated by an electric motor 32; and a battery attachment part 52 to which a rechargeable battery 100 supplying electricity to the electric motor 32 is detachably attached. A battery storage chamber 74 partitioned from the motor storage chamber 35 in the lawn mower main body 12 contains two battery attachment parts 52.

Description

  The present invention relates to an electric lawn mower that is used for cutting lawn or the like and uses a rechargeable battery pack (referred to as “battery”) as a power source.

  In Patent Document 1, a lawn mower body having a motor storage unit, an electric motor arranged in the motor storage unit, a cutting blade rotated by the electric motor, and a rechargeable battery for supplying power to the electric motor can be attached and detached. An electric lawn mower having one battery mounting portion to be mounted is disclosed.

  By the way, not only an electric lawn mower but also a battery of an electric tool such as a screw tightener or a marnoco is provided with an output voltage of, for example, 18V or 36V. Mainly, 18V output battery (18V battery) is used for hand-held tools with relatively small and low output models, and 36V output for relatively large and high output models that require higher output than 18V. A battery (36V battery) is used. In recent years, cordless is also achieved for large-sized electric tools, and 36V batteries have become widespread along with this, but 18V batteries are still the mainstream and widely spread. Also, normally, a user of a power tool prepares a plurality of spare batteries and charges them so that they can be used (worked) continuously for a long time while replacing the battery with a single power tool. I have to. Also in this respect, the 18V battery is more widely used than the 36V battery. Furthermore, the battery for electric tools can be reused between different electric tools having the same power supply specification. Since there are many types of 18V-specific power tools widely available, 18V batteries are much more popular than 36V batteries.

JP 2010-124697 A

Conventionally, for a high-power electric lawn mower that uses a 36V battery as a dedicated power source, the 18V battery that is more widely used than 36V cannot be diverted, so the user must prepare a 36V battery dedicated to a high-power electric lawn mower. Inevitably, there is a problem that the cost is high in this respect, and there is room for further improving the handleability of the high-powered electric lawn mower.
Therefore, an object of the present invention is to improve the convenience and handling of a high-output electric lawn mower by using a battery for a low-output electric lawn mower as a power source for the high-output electric lawn mower.

  1st invention can attach or detach the lawn mower main body which has a motor accommodating part, the electric motor arrange | positioned in a motor accommodating part, the cutting blade rotated by an electric motor, and the rechargeable battery which supplies electric power to an electric motor An electric lawn mower provided with a battery attachment part to be attached, wherein a plurality of battery attachment parts are provided in a portion of the lawn mower main body partitioned with respect to the motor storage part. According to this configuration, a plurality of low output batteries can be used as the power source of the high output electric lawn mower by attaching the batteries to the plurality of battery attachment parts provided in the lawn mower body. Thereby, the convenience and handleability of a high output electric lawn mower can be improved. Moreover, the several battery attachment part may be provided in the site | part divided with respect to the motor accommodating part of the lawn mower main body.

  In a second aspect based on the first aspect, the portion partitioned from the motor storage portion is formed by a motor cover that covers the motor storage portion and a cover member that is provided on the outside of the motor cover so as to be openable and closable. A battery storage unit. According to this configuration, the plurality of battery mounting portions and the plurality of batteries can be stored in the battery storage portion formed by the motor cover and the cover member. For this reason, a plurality of battery attachment parts and a plurality of batteries can be protected from rain water, dust, and the like. In addition, the plurality of batteries can be attached to and detached from the plurality of battery mounting portions by opening and closing the cover member.

According to a third invention, in the first or second invention, the lawn mower body includes a front wheel and a rear wheel,
In a plan view of the lawn mower body, the distance between the outer surfaces of the front wheels is A, the distance between the outer surfaces of the rear wheels is B, the midpoint of the distance A on the axle of the front wheels is C1, and the rear When the middle point of the distance B on the wheel axle is C2, the straight line passing through the middle point C1 and the middle point C2 is S, and the center of gravity of the electric lawn mower with the batteries attached to the plurality of battery attachment parts is G. The plurality of battery mounting portions are configured such that the center of gravity G of the electric lawn mower is located within a range R that is offset by 20% of the distance B in the left and right directions with respect to the straight line S. According to this configuration, the weight balance of the electric lawn mower can be improved. As a result, the workability of the electric lawn mower can be improved.

  According to a fourth aspect, in the third aspect, the plurality of battery attachment portions are configured so that the centers of gravity of the respective batteries attached to the plurality of battery attachment portions are located within the range R in the plan view of the lawn mower body. To do. According to this configuration, the weight balance of the electric lawn mower can be improved. As a result, the workability of the electric lawn mower can be improved.

  According to a fifth invention, in the first invention, two battery mounting portions are provided. According to this configuration, two batteries can be used by attaching the batteries to the two battery attachment portions.

  The sixth invention is the fifth invention according to the fifth invention, wherein two batteries are mounted so that the center of gravity of each battery attached to each battery attachment portion is located on the left and right with respect to a plane passing through the center in the left-right direction of the lawn mower body. The battery mounting part is configured. According to this configuration, the weight balance of the lawn mower body can be improved. As a result, the workability of the electric lawn mower can be improved.

  In a seventh aspect based on the fifth or sixth aspect, the two battery mounting portions are provided so that the attaching / detaching directions of the two batteries are parallel or substantially parallel.

  In an eighth aspect based on the fifth or sixth aspect, the two battery mounting portions are provided so that the attaching / detaching directions of the two batteries intersect.

  According to a ninth invention, in any one of the first to eighth inventions, the plurality of battery mounting portions can attach and detach a battery for an electric tool as a battery. According to this structure, the battery for electric tools can be attached / detached to / from the plurality of battery attachment portions. For this reason, the battery for electric tools can be used effectively.

1 is a perspective view showing an electric lawn mower according to Embodiment 1. FIG. It is a front view which shows a lawn mower main body. It is a left view which shows a lawn mower main body. It is a top view which shows a lawn mower main body. It is a sectional side view which shows a lawn mower main body. It is a perspective view which shows a battery. It is the figure which looked at the battery attachment base part which removed the battery from the arrow VII direction of FIG. It is a top view which shows typically the front wheel and rear wheel of a lawn mower main body. It is a top view which shows typically the front wheel and rear wheel which were arrange | positioned unevenly of the lawn mower main body. It is a top view which shows typically the front wheel and rear wheel of a lawn mower main body. It is a top view which shows typically the front wheel and rear wheel of a lawn mower main body. It is a figure which shows the battery attachment base part which concerns on Embodiment 2 according to FIG. It is a top view which shows the lawn mower main body which concerns on Embodiment 3. It is a left view which shows the lawn mower main body which concerns on Embodiment 4. It is a top view which shows a lawn mower main body. It is a left view which shows the lawn mower main body which concerns on Embodiment 5. It is a top view which shows a lawn mower main body. It is a left view which shows the lawn mower main body which concerns on Embodiment 6. It is a top view which shows a lawn mower main body. FIG. 10 is a plan view showing a lawnmower body according to a seventh embodiment. FIG. 10 is a plan view showing a lawnmower body according to an eighth embodiment. It is a left view which shows the lawn mower main body which concerns on Embodiment 9. It is a top view which shows a lawn mower main body. It is a top view which shows the lawn mower main body which concerns on Embodiment 10. FIG. It is a top view which shows the lawn mower main body which concerns on Embodiment 11. FIG. FIG. 22 is a plan view showing a lawnmower body according to Embodiment 12. It is a top view which shows the lawn mower main body which concerns on Embodiment 13. It is a top view which shows the lawn mower main body which concerns on Embodiment 14. FIG. 17 is a plan view showing a lawnmower body according to Embodiment 15. FIG. 22 is a plan view showing a lawnmower body according to Embodiment 16. FIG. 20 is a plan view showing a lawnmower body according to Embodiment 17. FIG. 20 is a plan view showing a lawnmower body according to Embodiment 18. FIG. 23 is a front view showing a lawnmower body according to Embodiment 19. It is a top view of the lawnmower main body which shows the example of a change of Embodiment 3. It is a top view of the lawnmower main body which shows the example of a change of Embodiment 3. FIG. 29 is a plan view showing a lawnmower body according to a twentieth embodiment. It is a side top view which shows a lawn mower main body. It is a top view of the lawn mower main body which shows the example of a change. It is a side plan view of a lawnmower body showing a modification. 3 is a plan view showing the battery according to Embodiment 1. FIG. It is a sectional side view which shows a battery.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Embodiment 1]
Embodiment 1 will be described. In this embodiment, a hand-driven electric lawn mower is illustrated. For convenience of explanation, the front, rear, top, and bottom directions of the electric lawn mower are based on the posture when the electric lawn mower is normally used by a user (referred to as “normal posture”). Each direction of the electric lawn mower corresponds to each direction viewed from the user who uses the electric lawn mower. FIG. 1 is a perspective view showing an electric lawn mower.
As shown in FIG. 1, the electric lawn mower 10 includes a lawn mower body 12 and a handle 13. The lawn mower body 12 includes a pair of left and right front wheels 14 and a pair of left and right rear wheels 16. On the rear side of the lawn mower main body 12, a mowing box 18 for storing mowing turf and the like is detachably provided.

  The handle 13 is provided at the rear upper part of the lawn mower main body 12 so as to extend obliquely above the mowing box 18. The handle 13 has a U-shaped frame shape, and both left and right ends thereof are fastened to the lawn mower body 12 by handle fixing screws 20. Further, the center portion, that is, the rear side portion of the handle 13 is a grip portion 15. The user grips the grip portion 15 of the handle 13 on the rear side of the electric lawn mower 10 and pushes the lawn mower body 12 forward to perform the lawn mowing work. Further, the handle 13 can be stored so as to overlap the lawn mower body 12 by loosening the left and right handle fixing screws 20 and rotating the handle 13 onto the lawn mower body 12.

  A switch lever 22 is provided at the rear of the handle 13. The switch lever 22 has a U-shaped frame shape, and both left and right end portions thereof are supported on both side portions of the handle 13 so as to be tiltable within a predetermined range in the vertical direction. A switch device 24 is provided on the right side of the handle 13 and on the support portion of the right end of the switch lever 22. The user can turn on / off a start switch (not shown) in the switch device 24 by tilting the switch lever 22 up and down with the fingertip of the hand gripping the grip portion 15 of the handle 13. In this embodiment, when the switch lever 22 is tilted downward, the start switch is turned on, and when the switch lever 22 is tilted upward, the start switch is turned off. The switch lever 22 is always biased to the off side by a spring (not shown). When the start switch is turned on, the signal is output to the motor controller 86 (described later) of the lawn mower main body 12 via the wiring 26, thereby starting the electric motor 32 (described later).

2 is a front view showing the lawn mower body, FIG. 3 is a left side view, FIG. 4 is a plan view, and FIG. 5 is a side sectional view.
As shown in FIGS. 2 to 5, the lawn mower body 12 includes a deck 28 and a cowling 30. The deck 28 surrounds the upper portion and the periphery of a cutting blade 37 (described later), and corresponds to a so-called cutter housing. Further, the front wheel 14 and the rear wheel 16 described above are disposed at the four corners of the front, rear, left and right of the deck 28. Further, the cowling 30 is attached to the deck 28 so as to cover the upper side thereof.

  As shown in FIG. 5, an electric motor 32 is attached almost on the center of the deck 28. The electric motor 32 is arranged in a downward posture with the output shaft 33 facing the road surface 36 (an posture in which the axis 33L of the output shaft 33 is orthogonal or substantially orthogonal to the road surface 36). In the present embodiment, the axis 33L of the output shaft 33 of the electric motor 32 is disposed at a position where it is aligned or substantially aligned with one plane 12L (see FIG. 4) passing through the center of the lawn mower body 12 in the left-right direction. In addition, the axis 33L of the output shaft 33 of the electric motor 32 may not be aligned with one plane 12L passing through the center of the lawn mower body 12 in the left-right direction.

  The electric motor 32 is disposed in a motor storage chamber 35 that is a space between the deck 28 and the cowling 30. The motor storage chamber 35 is formed so that outside air can be introduced and air that has cooled the electric motor 32 can be led out, and serves as an air passage for cooling the electric motor 32. The deck 28 and the cowling 30 constitute a motor housing. Further, the motor storage chamber 35 corresponds to a “motor storage section” in this specification. The cowling 30 corresponds to a “motor cover” that covers the motor storage chamber 35.

  A rotary blade type trimming blade 37 is horizontally attached to the output shaft 33 of the electric motor 32. The cutting blade 37 cuts the lawn and the like by rotating horizontally together with the output shaft 33. The height of the cutting blade 37, that is, the height of the cutting blade 37 with respect to the road surface 36 is the cutting height. The trimming height can be adjusted by a trimming height adjusting mechanism 39 (see FIG. 4) provided on the left side of the lawn mower body 12. The trimming height adjusting mechanism 39 is a known technique and will be described briefly.

  As shown in FIG. 4, the trimming height adjustment mechanism 39 includes a trimming height adjustment lever 40 that is operated by the user in the front-rear direction. The front wheel 14 and the rear wheel 16 are supported so as to be displaceable in the vertical direction with respect to the deck 28, and are linked to a trimming height adjustment lever 40 via a link mechanism 41. By operating the trimming height adjusting lever 40, the front wheel 14 and the rear wheel 16 are displaced in the vertical direction via the link mechanism 41. Thereby, the height of the deck 28, that is, the cutting height is adjusted. The trimming height adjusting lever 40 is inserted into a lever insertion window 42 that is opened in the cowling 30 and extends in the front-rear direction. On the cowling 30, a scale display unit 43 and a symbol display unit 44 are provided. The scale display unit 43 is disposed on the left side of the lever insertion window 42, and displays the height of the grass after cutting (cutting height) with a scale and a numerical value. Moreover, the symbol display part 44 is arrange | positioned at the right side of the lever insertion window 42, and displays the cutting height with a symbol.

  As shown in FIG. 5, a grass collection duct 46 for collecting grass and the like cut by the cutting blade 37 is formed on the deck 28. The lower surface side of the deck 28 opens in a cylindrical shape downward, that is, toward the road surface 36, and the opening serves as a grass collection port 47 of the grass collection duct 46. The cutting blade 37 is disposed in the grass collection port 47. A discharge port (not shown) of the grass collection duct 46 is opened toward the rear of the lawn mower body 12. The cutting box 18 (see FIG. 1) is connected to the discharge port. The grass collection duct 46 is formed in a spiral shape around the electric motor 32. Further, the grass collection duct 46 is formed so that the cross-sectional area of the passage gradually increases from a small opening that opens to the front of the grass collection opening 47 toward a discharge opening that forms a large opening. Accordingly, the upper surface of the grass collection duct 46 gradually increases from the small opening side toward the discharge port.

  A battery housing recess 70 is formed at the center of the upper surface of the cowling 30. Further, the cowling 30 is provided with a battery cover 72 that covers the upper surface opening of the battery housing recess 70. A battery storage chamber 74 is formed by the space between the cowling 30 and the battery cover 72. The battery storage chamber 74 is a space partitioned from the motor storage chamber 35. The battery storage chamber 74 is formed so as to be able to store two batteries 100 (described later). A front end portion of the battery cover 72 is rotatably mounted on the cowling 30 via a hinge shaft 73. For this reason, the battery cover 72 can be opened and closed by rotating the rear end portion up and down. In FIG. 5, a state in which the battery cover 72 is opened is indicated by a two-dot chain line 72. The battery housing chamber 74 and the battery cover 72 of the cowling 30 constitute a battery housing. The battery cover 72 corresponds to a “cover member” in this specification. Further, the battery storage chamber 74 corresponds to a “battery storage portion” in this specification.

  On the bottom side in the battery storage chamber 74, a rectangular plate-shaped battery mounting base portion 50 is provided. The battery mounting base 50 is inclined forward and rearward. The upper surface side of the battery mounting base unit 50 is a surface on the battery mounting side. On the upper surface side of the battery mounting base portion 50, two left and right battery mounting portions 52 are provided. A battery 100 is detachably attached to each of the left and right battery attachment portions 52. That is, the electric lawn mower 10 is a cordless type electric lawn mower 10 that uses two batteries 100 as power sources. The battery mounting part 52 and the battery 100 of the battery mounting base unit 50 will be described later.

  A lock-off key 76 is provided at the right rear end of the battery storage chamber 74. The lock-off key 76 is detachably inserted into a key insertion portion (not shown) formed in the cowling 30. By operating the lock-off key 76 to release the lock-off, both the batteries 100 are electrically connected to the power circuit (not shown) of the lawn mower body 12. Therefore, the electric motor 32 can be activated by turning on the switch lever 22 (see FIG. 1). Also, in a state where the lock-off key 76 is not unlocked or in a lock-off state where the lock-off key 76 is removed, the electrical connection between the batteries 100 and the power supply circuit is cut off. Thereby, even if the switch lever 22 (see FIG. 1) is turned on, the electric motor 32 is not started. As described above, the lock-off key 76 has a function of releasing the lock-off state of the lawn mower body 12 and setting the lock-off state.

  The lock-off key 76 is disposed so as to be housed in the battery housing chamber 74. For this reason, the lock-off key 76 is protected from rain water, dust and the like together with the battery mounting base unit 50 and the two batteries 100. The lock-off key 76 is disposed on the right side of the battery storage chamber 74, that is, on the opposite side of the cutting height adjustment lever 40 with respect to the central portion of the lawn mower body 12 and at a site that avoids the attachment / detachment path of the batteries 100. (See FIG. 4). For this reason, the lock-off key 76 does not get in the way when the batteries 100 are attached and detached.

  As shown in FIG. 4, a carrying handle 80 is provided on the cowling 30. The carrying handle 80 is disposed adjacent to the rear of the battery cover 72, and is a handle that the user grips when carrying the electric lawn mower 10 (see FIG. 1). Further, the cowling 30 is provided with a cover lock release lever 82. The cover lock release lever 82 is disposed adjacent to the front of the carrying handle 80. The cover lock release lever 82 locks the battery cover 72 in a closed state by engaging with the battery cover 72. The cover lock release lever 82 releases the lock on the battery cover 72 by a release operation.

  A pair of left and right support legs 84 are provided on the rear side of the lawn mower body 12. The lawn mower body 12 is supported by removing the mowing box 18 (see FIG. 1) and holding the handle 13 so that the lawn mower body 12 faces forward and the support legs 84 abut on the ground. That is, it can be made independent. For this reason, the lawn mower main body 12 can be stored compactly.

  A control unit so-called a motor controller 86 for controlling the electric motor 32 is arranged in the space on the left side of the rear portion of the motor housing chamber 35 near the discharge port (not shown) of the grass collection duct 46 (see FIG. 5). The motor controller 86 is formed in a rectangular parallelepiped shape, and its longitudinal direction is directed in the front-rear direction. The motor controller 86 is disposed on the upper wall portion of the grass collection port 47, which is the lower portion of the grass collection duct 46 in the deck 28. Further, the motor controller 86 is disposed at the left rear end of the grass collection port 47 in plan view (see FIG. 4). In addition, the space portion on the left side of the rear portion of the motor storage chamber 35 near the discharge port of the grass collection duct 46 is an upper wall portion of the grass collection port 47 of the grass collection duct 46 and an inner peripheral wall of the rear end portion of the grass collection duct 46. It is a corner part between the parts. By disposing the motor controller 86 at the corner portion, the space portion of the motor storage chamber 35 can be used effectively. As a result, the lawn mower body 12 can be reduced in size.

Next, the battery 100 will be described. 6 is a perspective view showing the battery, FIG. 40 is a plan view, and FIG. 41 is a side sectional view.
The battery 100 is a rechargeable battery that can be used repeatedly by being removed from the lawn mower body 12 (see FIGS. 1 to 5) and charged by a separately prepared charger (not shown). The battery 100 is a slide detachable battery. The “slide detachable battery” referred to in this specification is a type that is detachable by sliding the attachment side surface of the battery 100 with respect to the battery attachment side surface of the battery attachment portion 52 (described later). Refers to the battery. Further, as the battery 100, a battery for an electric tool such as a screw tightener or a marnoco is used.

  As shown in FIG. 41, the battery 100 is an 18V output lithium ion battery pack in which a plurality of battery cells 103 (10 batteries are shown in FIG. 41) are housed in a battery case 102. The battery cell 103 is formed in a cylindrical shape. With respect to the battery case 102, the ten battery cells 103 are accommodated in two stages, upper and lower, with the longitudinal direction oriented in the width direction (the front and back direction in FIG. 41).

As shown in FIG. 6, the battery case 102 of the battery 100 is formed in a rectangular parallelepiped shape. The length L, width W and height H of the battery 100 are as follows:
L>W> H
Are in a relationship. For convenience of explanation, the battery 100 has a length direction as a front-rear direction, a width direction as a left-right direction, and a height direction as a vertical direction. Further, the upper surface of the battery case 102 is defined as an attachment-side surface, the front surface thereof (referred to as “battery front surface”) as an attachment direction-side surface, and the rear surface (referred to as “battery rear surface”) as a removal direction-side surface .

As shown in FIGS. 6 and 40, the battery case 102 has a pair of left and right rail portions 104, a positive side connection terminal 106, a negative side connection terminal 108, and a connector 110 for transmitting / receiving a control signal of a charger on the upper surface thereof. I have. In addition, a lock claw 112 is provided at the rear end portion on the upper surface side of the battery case 102 so as to be able to protrude and retract in the vertical direction.
As shown in FIG. 41, the lock claw 112 is normally urged upward (in the protruding direction) by the spring 113, and the lock release button 114 provided on the rear surface of the battery case 102 is attached to the spring 113. The battery case 102 can be retracted by performing a pushing operation against the force.

Next, the left and right battery attachment parts 52 of the battery attachment base part 50 will be described. FIG. 7 is a view of the battery mounting base portion from which the battery is removed as viewed from the direction of arrow VII in FIG.
As shown in FIG. 7, the left and right battery attachment portions 52 of the battery attachment base portion 50 have the same configuration, so the left battery attachment portion 52 will be described, and the right battery attachment portion 52 will be described. The description of is omitted.

  The battery attachment part 52 is configured to be able to attach the battery 100 from the rear and to be detachable backward (see the white arrow in FIG. 7). Since the battery mounting base portion 50 is inclined forward and rearward, the battery mounting portion 52 can actually attach the battery 100 from the diagonally upward to the diagonally downward direction. It is configured to be removable from diagonally downward to diagonally upward (see the white arrow in FIG. 3).

  As shown in FIG. 7, a pair of front and rear rail portions 54, a positive electrode side connection terminal 56, and a negative electrode side connection terminal 58 are provided on the lower surface side of the battery attachment portion 52. Further, a claw engaging portion 62 that is recessed upward (behind the paper surface in FIG. 7) is provided at the left end portion of the battery mounting portion 52. The claw engaging portion 62 is formed to be able to engage the lock claw 112 of the battery 100. Note that the battery attachment portion 52 is a battery attachment portion for directly attaching a battery to which the battery 100 is directly attached without using a battery converter or a battery adapter. Moreover, since the battery attachment base part 50 is provided with the battery attachment part 52, it can also be regarded as a "battery attachment part" in a broad sense.

  A case where the battery 100 (see FIG. 6) is attached to the battery attachment portion 52 (see FIG. 7) will be described. The battery 100 is placed obliquely upward and rearward of the battery mounting portion 52 with the surface on the attachment side (battery upper surface) facing obliquely downward (behind the paper surface in FIG. 7) and the surface on the attachment direction (battery front) obliquely downward and forward. Keep it facing. In this state, the pair of rail portions 104 of the battery 100 are engaged with the pair of rail portions 54 of the battery mounting portion 52, and the battery 100 is tilted forward and obliquely downward (leftward obliquely downward of the white arrow in FIG. 3). Move (slide) (see arrow). Thereby, the positive electrode side connection terminal 106 of the battery 100 is connected to the positive electrode side connection terminal 56 of the battery attachment portion 52, and the negative electrode side connection terminal 108 of the battery 100 is connected to the negative electrode side connection terminal 58 of the battery attachment portion 52. The For this reason, the battery 100 is electrically connected to the battery mounting portion 52. Further, the lock claw 112 of the battery 100 is engaged with the claw engagement portion 62 of the battery attachment portion 52, whereby the battery 100 is fixed to the battery attachment portion 52. This state is a state where the battery 100 is completely attached. In this way, the two batteries 100 are attached to the two battery attachment portions 52.

  The two battery mounting portions 52 are provided so that the attaching / detaching directions of the two batteries 100 (see white arrows in FIG. 7) are parallel to the left and right. That is, the two batteries 100 are arranged in parallel on the left and right. The two batteries 100 are arranged in parallel in a direction (the width W direction of the battery 100) that intersects the longitudinal direction (the front-rear direction of the battery 100).

  In the state where the two batteries 100 are completely attached, the two batteries 100 are electrically connected to the electric motor 32 (see FIG. 5) via the respective battery attachment portions 52. For this reason, the electric motor 32 is operated by electric power (power feeding) supplied from the two batteries 100. Further, two batteries 100, that is, 18V batteries are connected in series to be used as a 36V battery. Accordingly, the electric motor 32 is operated by the 36 V power source output from the two batteries 100 connected in series.

  In the state where the battery 100 is completely attached, the lock claw 112 is disengaged from the claw engagement portion 62 of the battery attachment portion 52 by operating the lock release button 114 (see FIG. 4) of the battery 100. Then, the battery 100 is moved, that is, slid rearward and upward (refer to the arrow pointing upward to the right of the white arrow in FIG. 3). Thereby, the battery 100 can be removed from the battery mounting portion 52.

  FIG. 8 is a plan view schematically showing a front wheel and a rear wheel of the lawn mower body. As shown in FIG. 8, in the plan view of the lawn mower main body 12, the distance between both outer surfaces of the front wheel 14 is A, and the distance between both outer surfaces of the rear wheel 16 is B. The midpoint of the distance A on the axle 14S of the front wheel 14 is C1, and the midpoint of the distance B on the axle 16S of the rear wheel 16 is C2. A straight line passing through the middle point C1 and the middle point C2 is denoted by S, and a center of gravity of the electric lawn mower 10 (see FIG. 1) with the batteries 100 attached to the two battery attachment parts 52 is denoted by G, respectively. At this time, the two battery mounting portions 52 (see FIG. 5) so that the center of gravity G of the electric lawn mower 10 is located within a range R that is offset by 20% of the distance B in the left and right directions with respect to the straight line S. 7). In the present embodiment, the left and right front wheels 14 and the left and right rear wheels 16 are arranged symmetrically. Further, the straight line S is aligned or substantially aligned with a plane 12L (see FIG. 4) passing through the center of the lawn mower body 12 in the left-right direction.

Further, in the plan view of the lawn mower main body 12, the two battery attachment portions 52 are arranged so that the centers of gravity of the batteries 100 attached to the two battery attachment portions 52 are located within the range R (see FIG. 8). Is configured.
Further, the center of gravity of each battery 100 attached to each of the two battery attachment parts 52 is positioned so as to be located on the left and right with respect to a plane 12L (see FIG. 4) passing through the center of the lawn mower body 12 in the left-right direction. A single battery mounting portion 52 is configured.

As shown in FIG. 5, the two batteries 100 attached to the battery attachment portion 52 are near the upper side of the electric motor 32, closer to the rear than the axis 33 </ b> L of the output shaft 33 of the electric motor 32, and in plan view. (See FIG. 4), the lawn mower body 12 is disposed at a position that is symmetrical with respect to a plane 12L passing through the center in the left-right direction. Thereby, the lawn mower main body 12 can be configured compactly in the height direction.
Further, since the battery 100 is attached to and detached from the battery attachment portion 52 with the battery 100 in the forward tilted posture (see FIG. 3), the attachment and detachment operation of the battery 100 can be easily performed.

  Further, the deck 28 to which the electric motor 32 is attached and the cowling 30 provided with the battery attachment base part 50 having the two battery attachment parts 52 to which the two batteries 100 are attached are separate members. For this reason, the vibration of the electric motor 32 is not easily transmitted to the battery 100. In this way, anti-vibration measures for the two batteries 100 are taken.

  Further, the lock release buttons 114 (see FIG. 4) of both batteries 100 attached to both battery attachment parts 52 are configured to be positioned above the battery housing recess 70 of the cowling 30 of the lawn mower main body 12. For this reason, the unlocking operation at the time of removing both the batteries 100 can be easily performed.

  According to the electric lawn mower 10 according to the present embodiment configured as described above, by attaching the battery 100 (18V battery for low output) to the two battery attachment parts 52 provided in the lawn mower body 12, Two low-output batteries 100 can be used as a power source for the high-power (rated voltage 36V) electric lawn mower 10. Thereby, the convenience and handleability of the high output electric lawn mower 10 can be improved. In particular, it is possible to divert 18V batteries that are currently widely used, including spare batteries, etc., so that the high-powered electric lawn mower 10 with 36V specifications can be used without purchasing expensive 36V batteries separately. Thereby, the remarkable effect can be acquired at the point which can aim at the cost reduction of a mowing work, and the improvement of workability | operativity. Moreover, the two battery attachment parts 52 may be provided in the battery storage chamber 74 which is a part partitioned with respect to the motor storage chamber 35 of the lawn mower body 12.

  Further, a portion partitioned from the motor storage chamber 35 is a battery storage chamber 74 formed by a cowling 30 that covers the motor storage chamber 35 and a battery cover 72 that can be opened and closed outside the cowling 30. . Therefore, the two battery mounting portions 52 and the two batteries 100 can be stored in the battery storage chamber 74 formed by the cowling 30 and the battery cover 72. For this reason, the two battery attachment parts 52 and the two batteries 100 can be protected from rainwater, dust, and the like. Further, the two batteries 100 can be attached to and detached from the two battery attachment portions 52 by opening and closing the battery cover 72.

In a plan view of the lawn mower body 12 (see FIG. 8), the distance between both outer surfaces of the front wheel 14 is A, the distance between both outer surfaces of the rear wheel 16 is B, and the axle 14S of the front wheel 14 The midpoint of the distance A above is C1, the midpoint of the distance B on the axle 16S of the rear wheel 16 is C2, and a straight line passing through the midpoint C1 and the midpoint C2 is S, and the two battery mounting parts 52 When the center of gravity of the electric lawn mower 10 to which the battery 100 is attached is G, the center of gravity G of the electric lawn mower 10 is within a range R offset by 20% of the distance B in the left and right directions with respect to the straight line S. Two battery mounting portions 52 are configured to be positioned. Therefore, the weight balance of the electric lawn mower 10 (see FIG. 1) can be improved. As a result, the workability | operativity of the electric lawn mower 10 (refer FIG. 1) can be improved.
In the width direction of the electric lawn mower 10, the center of gravity G of the electric lawn mower 10 (product) is most preferably located on the straight line (reference line) S from the viewpoint of the left and right weight balance. The center of gravity G may shift to the left or right with respect to the straight line S. Even in this case, the left and right sides of the straight line S are positioned at the center of gravity G in a range R that is 20% (0.2B) offset from the distance B. A weight balance can be ensured.

  FIG. 9 is a plan view schematically showing a front wheel and a rear wheel that are unevenly arranged on the lawn mower body. As shown in FIG. 9, for example, when the left and right front wheels 14 are offset by a predetermined distance to the left so that the left front wheel 14 and the left rear wheel 16 are arranged in a front-and-rear arrangement, cutting (cutting) is performed. In the electric lawn mower, the range R is offset by 20% of the distance B in each of the left and right directions with respect to the straight line S passing through the midpoint C1 of the distance A and the midpoint C2 of the distance B. What is necessary is just to comprise the two battery attachment parts 52 so that the gravity center G of the electric lawn mower 10 may be located inside.

  FIG. 10 is a plan view schematically showing a front wheel and a rear wheel of the lawn mower body. As shown in FIG. 10, when the rear wheel (reference numeral 16A) is composed of one roller, the distance between both outer surfaces of the rear wheel 16A may be B. FIG. 11 is a plan view schematically showing the front and rear wheels of the lawn mower body. As shown in FIG. 11, when the front wheel (reference numeral 14A) is composed of one roller, the distance between both outer surfaces of the front wheel 14A may be B. In the present embodiment, the distance A between both outer surfaces of the front wheel 14 and the distance B between both outer surfaces of the rear wheel 16 are related to A <B, but A = B or A > B may be satisfied.

  Further, in the plan view of the lawn mower main body 12, the two battery attachment portions 52 are arranged so that the centers of gravity of the batteries 100 attached to the two battery attachment portions 52 are located within the range R (see FIG. 8). Is configured. Therefore, the weight balance of the electric lawn mower 10 can be improved. As a result, the workability of the electric lawn mower 10 can be improved.

  Further, the two centers of the batteries 100 attached to the battery mounting portions 52 are positioned on the left and right with respect to one plane 12L (see FIG. 4) passing through the center of the lawn mower body 12 in the left-right direction. A battery mounting portion 52 is configured. Therefore, the weight balance of the lawn mower body 12 can be improved. As a result, the workability of the electric lawn mower 10 can be improved.

  Further, the two battery mounting portions 52 are provided so that the attaching / detaching directions of the two batteries 100 (see white arrows in FIG. 3) are parallel to each other. Therefore, the two batteries 100 can be arranged compactly by making the two battery attachment portions 52 adjacent to each other. In this case, between the two batteries 100 (between the side surfaces facing each other), an interval at which the user's finger can be inserted when the battery 100 is attached to or detached from the two battery mounting portions 52, for example, an average finger insertion and removal. It is preferable to set a minimum interval of 15 mm or more. If it is not necessary to put a user's finger in and out of the two batteries 100, the space between the two batteries 100 can be reduced by reducing the space between the two batteries 100. Less is better. Further, in the case of a large battery 100 having a volume of 200 cm3 or more, it is considered that there is little or no need to put a user's finger in and out of the two batteries 100. The space occupied volume of the two batteries 100 may be reduced by setting the interval between the two batteries to 15 mm or less.

  In addition, the two battery attachment portions 52 can attach and detach a power tool battery as the battery 100. Therefore, the power tool batteries can be attached to and detached from the two battery attachment portions 52, respectively. For this reason, the battery for electric tools (18V battery in this embodiment) can be used effectively.

[Embodiment 2]
A second embodiment will be described. Since the embodiments subsequent to the present embodiment are modifications to the first embodiment, the changed portions will be described, and overlapping descriptions will be omitted. FIG. 12 is a view showing the battery mounting base portion according to FIG.
As shown in FIG. 12, in the present embodiment, an elastic member 64 such as a leaf spring that biases the battery 100 in the removal direction is provided on the back side (front side) of the battery mounting portion 52 in the first embodiment in the battery mounting direction. It has been. In this case, the battery 100 is attached to the battery attachment portion 52 using the elastic deformation of the elastic member 64. When the lock release button 114 (see FIG. 4) is operated when removing the battery 100, the battery 100 is pushed out in the removal direction (rearward) by the elastic restoring force of the elastic member 64.

[Embodiment 3]
A third embodiment will be described. FIG. 13 is a plan view showing the lawn mower body. When a plurality of (for example, two) batteries are connected in series, the product (electric mower) cannot be used due to failure or discharge of any one of the batteries. For this reason, it is desirable that there is a means for notifying the remaining capacity of each battery in order to know which battery has been discharged, etc., to stop the product. In the case of notification by display, it is desirable to arrange the indicator at a position corresponding to the position of the battery that is visible to the user when the user (user) attaches the battery or when the product is used.

  In this embodiment, as shown in FIG. 13, two left and right display units for displaying the remaining capacity of each battery on the rear end of the cowling 30 of the lawn mower body 12 of the first embodiment (see FIG. 4). A display 65 having 66 is arranged. Specifically, the indicator 65 is disposed between the battery housing recess 70 and the carrying handle 80. In this case, the indicator 65 is disposed outside the battery cover 72, that is, outside the battery storage chamber 74. Each display unit 66 of the display unit 65 displays the remaining capacity with a plurality of bars. By operating a display button 67 provided on the display unit 65, the remaining capacity of the battery 100 is displayed. Displayed when the lamp is lit. Each display unit 66 of the display device 65 corresponds to each battery 100. That is, the left indicator 65 corresponds to the left battery 100, and the right indicator 65 corresponds to the right battery 100. In FIG. 13, the cover lock release lever 82 is omitted.

Further, as shown in FIG. 34, the indicator 65 may be disposed at the rear end portion of the battery housing recess 70 of the cowling 30. In this case, the indicator 65 is disposed inside the battery cover 72, that is, on the indoor side of the battery storage chamber 74.
Further, as shown in FIG. 35, the indicator 65 may be disposed in front of the battery cover 72. In this case, the indicator 65 is disposed outside the battery cover 72, that is, outside the battery storage chamber 74.

  According to this embodiment, the user can know the remaining capacity of each battery 100 from the display of each display unit 66 of the display device 65, and can also know the abnormality (failure, discharge, etc.) of each battery 100. . 13 and 35, each display unit 66 corresponding to each battery 100 of the battery remaining capacity notification means corresponds to the position of each battery 100 at a position that can be seen by the user when the electric brush cutter 10 is used. ing. Therefore, the user can easily know the remaining capacity of each battery 100.

  The indicator 65 corresponds to “battery remaining capacity notifying means” for notifying that the remaining capacity of the battery 100 is displayed. Further, for example, when both batteries 100 are arranged in the front and rear as in Embodiments 4 and 8 to be described later, the display device 65 may be arranged so that the both display units 66 are arranged in the front and rear. Further, the indicator 65 may be disposed inside the battery cover 72 or may be disposed outside the battery cover 72. The indicator 65 may be disposed on the handle 13. Further, the battery remaining capacity notifying means is not limited to the indicator 65 that displays the remaining capacity with a plurality of bars, but may be displayed in color, or may be notified by blinking speed, sound, or the like. In addition, when each battery 100 has a remaining capacity lower than a predetermined value (when the drive is stopped), a function (blinking of a lamp, red display) indicating which battery 100 is the cause may be provided.

[Embodiment 4]
A fourth embodiment will be described. This embodiment is a modification of the first embodiment. Further, the embodiments after this embodiment relate to a modified example of the arrangement form of the two batteries 100. FIG. 14 is a left side view showing the lawn mower body, and FIG. 15 is a plan view. 14 to 33, the battery housing recess 70, the battery cover 72, the battery mounting base unit 50, and the both battery mounting units 52, which are peripheral members related to both the batteries 100, are omitted.

  As shown in FIGS. 14 and 15, in the present embodiment, both the batteries 100 are arranged in a column in the front-rear direction. Both batteries 100 are arranged so that the center of gravity is aligned or substantially aligned on one plane 12L passing through the center of the lawn mower body 12 in the left-right direction (see FIG. 15). Moreover, both the batteries 100 are arrange | positioned at the inclination shape of the front fall and back rise similarly to Embodiment 1 (refer FIG. 3). Moreover, both the batteries 100 can be attached from diagonally upward and backward, and can be removed diagonally upward and backward (see white arrows in FIG. 14). Moreover, the attachment / detachment direction of the two batteries 100 is parallel to the front and rear. In this case, the two batteries 100 are arranged in parallel in the front-rear direction. The front battery 100 is disposed above the electric motor 32 (see FIG. 15). Although not shown, the battery mounting base 50, the both battery mountings 52, the battery housing recess 70 and the battery cover 72 are set according to the arrangement form of the batteries 100. In this case, the battery mounting base 50, the battery housing recess 70, and the battery cover 72 may correspond to each battery 100 individually, or may correspond to two batteries 100.

[Embodiment 5]
A fifth embodiment will be described. This embodiment is a modification of the first embodiment. FIG. 16 is a left side view showing the lawn mower body, and FIG. 17 is a plan view.
As shown in FIGS. 16 and 17, in the present embodiment, both batteries 100 are arranged in parallel in the left-right direction on the front end portion of the cowling 30. Both batteries 100 are arranged in front of the electric motor 32 in the plan view of the lawn mower body 12. Both batteries 100 are arranged symmetrically with respect to a plane 12L passing through the center of the lawn mower body 12 in the left-right direction (see FIG. 17). Moreover, both the batteries 100 are arrange | positioned horizontally. Further, both batteries 100 can be attached from the front in a horizontal posture, and can be removed backward (see the white arrow in FIG. 16). Moreover, the attachment / detachment direction of both the batteries 100 is parallel to the left and right.

[Embodiment 6]
A sixth embodiment will be described. This embodiment is a modification of the fifth embodiment. 18 is a left side view showing the lawn mower body, and FIG. 19 is a plan view of the same.
As shown in FIGS. 18 and 19, in the present embodiment, both batteries 100 of the fifth embodiment (see FIGS. 16 and 17) are arranged vertically. Further, both batteries 100 can be attached from above in a vertical posture, and conversely, can be removed upward (see white arrows in FIG. 18). Moreover, the attachment / detachment direction of both the batteries 100 is parallel to the left and right.

[Embodiment 7]
A seventh embodiment will be described. This embodiment is a modification of the first embodiment. FIG. 20 is a plan view showing the lawn mower body.
As shown in FIG. 20, in the present embodiment, both batteries 100 of the first embodiment (see FIG. 4) are disposed substantially directly above the electric motor 32. Moreover, both the batteries 100 are arrange | positioned horizontally. Further, both batteries 100 can be attached from the rear in a horizontal posture, and can be removed backward (see the white arrow in FIG. 20). The two batteries 100 can be attached from the front opposite to the present embodiment, and can be removed forward.

[Eighth embodiment]
Embodiment 8 will be described. This embodiment is a modification of the seventh embodiment. FIG. 21 is a plan view showing the lawn mower body.
As shown in FIG. 21, in the present embodiment, both batteries 100 of the seventh embodiment (see FIG. 20) can be attached from the left side and can be removed to the left side (in FIG. 21, white in FIG. 21). See the drop arrow). Moreover, the attachment / detachment direction of the two batteries 100 is parallel to the front and rear. In this case, the two batteries 100 are arranged in parallel in the front-rear direction. The two batteries 100 may be attached from the right side opposite to the present embodiment, and may be detachable to the right side.

[Embodiment 9]
Embodiment 9 will be described. This embodiment is a modification of the sixth embodiment. FIG. 22 is a left side view showing the lawn mower body, and FIG. 23 is a plan view.
As shown in FIGS. 22 and 23, in this embodiment, both batteries 100 of Embodiment 6 (see FIGS. 18 and 19) are arranged behind the electric motor 32 of the lawn mower body 12.

[Embodiment 10]
Embodiment 10 will be described. This embodiment is a modification of the seventh embodiment. FIG. 24 is a plan view showing the lawn mower body.
As shown in FIG. 24, in this embodiment, both batteries 100 of Embodiment 7 (see FIG. 20) are arranged in a column in the left-right direction directly above or substantially above the electric motor 32. Moreover, both the batteries 100 can be attached from the left side and can be removed to the left side (see the white arrow in FIG. 24). The two batteries 100 may be attached from the right side opposite to the present embodiment, and may be detachable to the right side.

[Embodiment 11]
Embodiment 11 will be described. This embodiment is a modification of the seventh embodiment. FIG. 25 is a plan view showing the lawn mower body.
As shown in FIG. 25, in this embodiment, both batteries 100 of Embodiment 7 (see FIG. 20) are arranged so as to be shifted to one side (right side in FIG. 25) in the plan view of the lawn mower body 12. Yes. Accordingly, the left battery 100 is disposed above the electric motor 32.

[Embodiment 12]
Embodiment 12 will be described. This embodiment is a modification of the seventh embodiment. FIG. 26 is a plan view showing the lawn mower body.
As shown in FIG. 26, in the present embodiment, both batteries 100 of the seventh embodiment (see FIG. 20) are disposed in front of the electric motor 32 in a plan view of the lawn mower body 12. Further, the two batteries 100 are arranged symmetrically in a state where the distance between them is enlarged.

[Embodiment 13]
Embodiment 13 will be described. This embodiment is a modification of the tenth embodiment. FIG. 27 is a plan view showing the lawn mower body.
As shown in FIG. 27, in this embodiment, both batteries 100 of the embodiment 10 (see FIG. 24) can be mounted from the upper left obliquely in the forward tilt posture (see FIG. 3) similar to the first embodiment. On the contrary, it can be removed diagonally upward to the left.

[Embodiment 14]
Embodiment 14 will be described. This embodiment is a modification of the first embodiment. FIG. 28 is a plan view showing the lawn mower body.
As shown in FIG. 28, in the present embodiment, both batteries 100 of the first embodiment (see FIG. 4) are disposed on the left rear end portion of the cowling 30. Both batteries 100 are arranged above the rear portion of the grass collection port 47 (see FIG. 5), which is the lower portion of the grass collection duct 46 in the deck 28. For this reason, the attachment position of both the batteries 100 can be set to a low position.

[Embodiment 15]
Embodiment 15 will be described. The present embodiment is a modification of the fourteenth embodiment. FIG. 29 is a plan view showing the lawn mower body.
As shown in FIG. 29, in the present embodiment, the batteries 100 of the fourteenth embodiment (see FIG. 28) are arranged in tandem in the front-rear direction as in the fourth embodiment (see FIG. 15). Also in this case, both batteries 100 are disposed above the grass collection port 47, which is the lower portion of the grass collection duct 46 in the deck 28.

[Embodiment 16]
Embodiment 16 will be described. The present embodiment is a modification of the fifteenth embodiment. FIG. 30 is a plan view showing the lawn mower body.
As shown in FIG. 30, in this embodiment, both batteries 100 of Embodiment 15 (see FIG. 29) are arranged in front of and behind the electric motor 32 in the plan view of the lawn mower body 12. Moreover, both the batteries 100 are arrange | positioned so that the gravity center may align or substantially align on one plane 12L which passes the center of the left-right direction of the lawn mower main body 12. FIG.

[Embodiment 17]
Embodiment 17 will be described. This embodiment is a modification of the first embodiment. FIG. 31 is a plan view showing the lawn mower body.
As shown in FIG. 31, in the present embodiment, both batteries 100 of the first embodiment (see FIG. 4) are disposed substantially directly above the electric motor 32.

[Embodiment 18]
Embodiment 18 will be described. This embodiment is a modification of the seventh embodiment. FIG. 32 is a plan view showing the lawn mower body.
As shown in FIG. 32, in the present embodiment, both the batteries 100 of the seventh embodiment (see FIG. 20) are arranged in a V shape in the plan view of the lawn mower body 12. That is, the battery 100 on the left side can be attached from the rear oblique left side, and conversely, can be removed from the rear oblique left side (see the white arrow in FIG. 32). Moreover, the battery 100 on the right side can be attached from the rear oblique right side, and conversely, the battery 100 can be removed from the rear oblique right side (see the white arrow in FIG. 32). In this case, the attachment / detachment directions of the two batteries 100 intersect.

[Embodiment 19]
Embodiment 19 will be described. This embodiment is a modification of the sixth embodiment. FIG. 33 is a front view showing the lawn mower body.
As shown in FIG. 33, in this embodiment, both batteries 100 of Embodiment 6 (see FIGS. 18 and 19) are arranged in a V shape when the lawn mower main body 12 is viewed from the front. That is, the battery 100 on the left side (right side in FIG. 33) can be attached from the upper diagonal left (upward diagonal right in FIG. 33), and can be removed from the upper diagonal left (in FIG. 32, (See the white arrow on the right). Further, the battery 100 on the right side (left side in FIG. 33) can be attached from the upper oblique right side (upward oblique left side in FIG. 33), and conversely can be removed obliquely upward upward (in FIG. 32, (See the white arrow on the left). In this case, the attachment / detachment directions of the two batteries 100 intersect.

[Embodiment 20]
Embodiment 20 will be described. FIG. 36 is a plan view showing the lawn mower body, and FIG. 37 is a side plan view of the same. When a plurality of (for example, two) batteries are connected in series, it is desirable to include a battery controller that monitors at least the voltage of each battery. The battery controller may be integrated with the motor controller that controls the driving state of the electric motor 32 (process by a single microcomputer), or may be separate from the motor controller (process by a separate microcomputer). However, it is desirable to be integrated with the motor controller from the viewpoint of reducing the occupied space and wiring.

  In the present embodiment, as shown in FIGS. 36 and 37, a battery controller 90 is disposed between the bottom wall portion of the battery accommodating recess 70 and the battery mounting base portion 50 of the first embodiment (see FIG. 2). ing. As described above, the battery controller 90 is desirably arranged in the vicinity of the battery 100 from the viewpoint of reducing wiring. The battery controller 90 is integrated with a motor controller (not shown).

  Further, as shown in FIGS. 38 and 39, the battery controller 90 can be disposed in the motor storage chamber 35. In this case, it is usually desirable to arrange the battery controller 90 to be exposed to the airflow generated by the fan attached to the output shaft 33 of the electric motor 32. Thereby, the battery controller 90 which generates heat can be cooled. In this case, an air passage that starts from an intake hole formed in the motor housing chamber 35 and leads to a fan of the electric motor 32, or an air passage that starts from the fan of the electric motor 32 and leads to an exhaust hole formed in the motor housing 70. It is desirable to arrange the battery controller 90 in the middle of any of the passages. Furthermore, it is desirable that the battery controller 90 be disposed in the vicinity of the electric motor 32 that is more easily cooled by the air flow. 38 and 39, the battery controller 90 is attached to the inner peripheral wall portion of the grass collection duct 46.

[Example of change]
Various modifications can be added to the embodiment. For example, the number of battery attachment parts 52 is not limited to two, and may be three or more. Moreover, you may connect a some battery in parallel besides connecting in series. Further, the battery is not limited to the power tool battery, and a dedicated battery may be used. In addition to the 18V battery, a 36V battery, a 24V battery, a 14.4V battery, a 10.8V battery, or the like may be used as the battery. Further, the battery is not limited to a slide detachable battery, but may be a so-called pluggable battery in which the battery is inserted into and removed from the hollow portion of the battery mounting portion formed in a cylindrical shape. Moreover, although the said embodiment showed the example which used the same battery in multiple numbers, you may use a battery with a different volume and a different weight as a some battery.

  Moreover, in the said embodiment, although the various battery arrangement | positioning form was shown, arrangement | positioning of a battery is not restricted to embodiment. For example, one battery may be arranged at a plurality of battery arrangement locations shown in the embodiment. In addition, the plurality of batteries can be disposed anywhere as long as they are separated from the motor storage unit in the lawn mower body 12. Further, at least one battery may be disposed on the handle 13. Moreover, what is necessary is just to set the battery attachment part 52 according to arrangement | positioning of a battery.

  Moreover, the same direction may be sufficient as the attachment / detachment direction of a some battery, and a different direction may be sufficient as it. In addition, the orientation of the surfaces on the mounting side of the plurality of batteries may be the same direction or different directions. In addition, the orientation of the surfaces on the mounting side of the plurality of batteries may be the same direction or different directions. Further, the battery mounting base portions 50 and 51 may be omitted, and the battery mounting portion 52 may be provided directly on the cowling 30.

  In addition, a discharge path for discharging water that has entered the battery storage recess 70 may be provided at the bottom of the battery storage recess 70. The discharge path may be configured so that water is not applied to the electric motor 32 and the motor controller 86. Further, the battery cover 72 may be provided as necessary and may be omitted. Further, the battery mounting base part 50 or the battery mounting part 52 may be provided on the cowling 30 from which the battery housing recess 70 is omitted. Further, instead of the rotary blade type trimming blade 37, a reel blade type trimming blade may be used. The reel blade type cutting blade includes a cylindrical rotating tube extending in the horizontal direction (left and right direction) and a cutting blade disposed on an outer peripheral portion of the rotating tube, and cuts grass and the like by rotating the rotating tube. be able to.

DESCRIPTION OF SYMBOLS 10 ... Electric lawn mower 12 ... Lawn mower main body 14 ... Front wheel 16 ... Rear wheel 30 ... Cowling (motor cover)
32 ... Electric motor 35 ... Motor storage chamber (motor storage section)
37 ... Mowing blade 52 ... Battery mounting portion 72 ... Battery cover (cover member)
74 ... Battery storage room (battery storage part)
100 ... Battery

Claims (9)

A lawn mower body having a motor housing;
An electric motor disposed in the motor housing;
A cutting blade rotated by the electric motor;
An electric lawn mower comprising: a battery attaching part for detachably attaching a rechargeable battery for supplying electric power to the electric motor;
An electric lawn mower comprising a plurality of the battery attachment parts in a portion of the lawn mower body that is partitioned with respect to the motor storage part. The electric lawn mower according to claim 1,
The part partitioned with respect to the motor storage part is a battery storage part formed by a motor cover that covers the motor storage part and a cover member that is provided on the outside of the motor cover so as to be openable and closable. Electric lawn mower. The electric lawn mower according to claim 1 or 2,
The lawn mower body includes a front wheel and a rear wheel,
In a plan view of the lawn mower body, the distance between both outer surfaces of the front wheel is A, the distance between both outer surfaces of the rear wheel is B, and the midpoint of the distance A on the axle of the front wheel C1, the midpoint of the distance B on the axle of the rear wheel is C2, the straight line passing through the midpoint C1 and the midpoint C2 is S, and a battery is attached to each of the plurality of battery mounting portions. Assuming that the center of gravity of the lawn mower is G, the plurality of the center of gravity of the electric lawn mower are positioned so that the center of gravity G of the electric lawn mower is located within a range R offset by 20% of the distance B with respect to the straight line S in the left and right directions An electric lawn mower characterized by constituting a battery mounting part. The electric lawn mower according to claim 3,
The plurality of battery attachment portions are configured such that the center of gravity of each battery attached to each of the plurality of battery attachment portions is located within the range R in a plan view of the lawn mower body. Machine. The electric lawn mower according to claim 1,
An electric lawn mower characterized in that there are two battery mounting parts. The electric lawn mower according to claim 5,
The two battery attachment parts are configured such that the center of gravity of each battery attached to each battery attachment part is located on the left and right with respect to a plane passing through the center in the left-right direction of the lawn mower body. Electric lawn mower characterized. The electric lawn mower according to claim 5 or 6,
The electric lawn mower characterized in that the two battery mounting portions are provided so that the attaching / detaching directions of the two batteries are parallel or substantially parallel. The electric lawn mower according to claim 5 or 6,
The electric lawn mower characterized in that the two battery attachment portions are provided so that the attachment / detachment directions of the two batteries intersect. The electric lawn mower according to any one of claims 1 to 8,
The electric lawn mower according to claim 1, wherein the plurality of battery attachment parts are detachable from a battery for an electric tool as the battery.

Images