JP2023095043A - work machine - Google Patents

Abstract

To provide technique enabling suppression of the occurrence of a problem in which implement-side terminals in a battery storage space are short-circuited through water.SOLUTION: A work machine comprises: a work unit; an air blowing fan; a motor; a main body housing having a suction port; a battery pack which is detachably fitted to a battery fitting portion of the main body housing; a battery cover; and a plurality of implement side terminals. In a state in which the battery cover is closed, the battery storage space storing the battery pack is defined by the main body housing, the battery fitting portion, and the battery cover. Any of the main body housing, the battery fitting portion, and the battery cover defining the battery storage space, has a suction port communicating an air passage with the battery storage space. In the battery storage space in a work state of the work machine, the suction port is provided above the plurality of the implement side terminals.SELECTED DRAWING: Figure 3

Description

The technology disclosed in this specification relates to a working machine.

Patent Document 1 discloses a working part, a blower fan, a motor for driving the working part and the blower fan, a body housing having an air intake hole, a battery pack attachable to and detachable from a battery mounting part of the body housing, and a battery cover that can be opened and closed to cover the battery pack attached to the battery mounting portion; and a plurality of battery covers extending upward from the battery mounting portion and electrically connected to the plurality of battery side terminals of the battery pack. and a device-side terminal of When the battery cover is closed, a battery housing space for housing the battery pack is defined by the body housing, the battery mounting portion, and the battery cover.

JP 2006-094796 A

In the working machine disclosed in Patent Document 1, when the motor is driven, the working part and the blower fan are driven. When the blower fan is driven, air is sucked into the body housing through air intake holes provided in the body housing. Generally, a working machine having a battery cover is designed so that the battery housing space is sealed when the battery cover is closed. Therefore, even if the blower fan is driven, the air in the battery housing space will not be sucked into the main body housing. However, in an actual work machine, there is a minute gap between the battery mounting portion and the body housing. Therefore, when the blower fan is driven, the air in the battery housing space is sucked into the body housing. In this case, the inside of the battery accommodation space becomes a negative pressure state with respect to the outside of the battery accommodation space. Therefore, when water adheres to the body housing near the battery cover, the water is sucked into the battery housing space. Then, water sucked into the battery housing space may adhere to the plurality of device-side terminals, causing a short circuit between the plurality of device-side terminals.

The present specification provides a technique capable of suppressing a short circuit between device-side terminals in a battery housing space through water.

A working machine disclosed in this specification includes a working part, a blower fan, a motor for driving the working part and the blower fan, a body housing having an air intake hole, and a battery attachment part of the body housing that can be attached to and detached from the body housing. a battery cover that is provided in the body housing and that can be opened and closed to cover the battery pack attached to the battery attachment portion; and extends upward from the battery attachment portion to cover the battery pack. and a plurality of device-side terminals electrically connected to the plurality of battery-side terminals, wherein when the battery cover is closed, the main body housing, the battery mounting portion, and the battery cover , a battery housing space for housing the battery pack is defined, and any one of the main body housing defining the battery housing space, the battery mounting portion, and the battery cover communicates the air passage with the battery housing space. The suction hole may be provided above the plurality of device-side terminals in the battery housing space in the operating state of the work machine.

Water sucked into the battery housing space flows downward from above. According to the above configuration, the water sucked into the battery housing space by driving the blower fan is provided on the upper side before reaching the plurality of device-side terminals provided on the lower side. Sucked into the suction hole. Therefore, it is possible to prevent water from adhering to the plurality of device-side terminals in the battery housing space. Therefore, it is possible to prevent the device-side terminals in the battery housing space from being short-circuited through water.

Fig. 2 is a perspective view of the lawn mower 2 according to the first embodiment as seen from the upper right front side; Fig. 2 is a left side view of the lawn mower 2 according to the first embodiment, viewed from the left; Fig. 2 is a right cross-sectional view of the lawn mower 2 according to the first embodiment as seen from the right; Fig. 3 is a perspective view of the battery IF unit 60 of the lawn mower 2 according to the first embodiment, as seen from the upper right rear side; Fig. 3 is a perspective view of the battery IF unit 60 of the lawn mower 2 according to the first embodiment, as seen from the left upper rear; FIG. 2 is a perspective view of the battery pack 200 according to the first embodiment as seen from the lower right rear. Fig. 2 is a right cross-sectional view of the lawn mower 2 according to the first embodiment as seen from the right; Fig. 11 is a perspective view of the battery IF unit 60 of the lawn mower 2 according to the second embodiment, as seen from the upper right rear side;

A representative and non-limiting embodiment of the invention is described in detail below with reference to the drawings. This detailed description is merely intended to provide those skilled in the art with details for implementing a preferred embodiment of the invention, and is not intended to limit the scope of the invention. Moreover, the additional features and inventions disclosed can be used separately or in conjunction with other features and inventions to provide still improved work machines.

Moreover, any combination of features and steps disclosed in the following detailed description are not required to practice the invention in its broadest sense, but are specifically intended to illustrate representative embodiments of the invention only. is described. Moreover, various features of the representative embodiments below, as well as those that are claimed, are described herein in providing additional and useful embodiments of the invention. They do not have to be combined in the exact order of the examples or in the order listed.

All features set forth in the specification and/or claims, apart from the configuration of the features set forth in the examples and/or claims, are set forth in the disclosure and claims as originally filed. They are intended to be disclosed individually and independently of each other as limitations on the particulars identified. Further, all numerical ranges and groups or populations are intended to disclose intermediate configurations as limitations on the specific subject matter recited in the original disclosure as well as the claims.

In one or more embodiments, a work machine includes a work section, a blower fan, a motor for driving the work section and the blower fan, a body housing having an air intake hole, and a battery mounting portion of the body housing. a detachable battery cover provided in the body housing and openable and closable to cover the battery pack attached to the battery attachment portion; and extending upward from the battery attachment portion, the and a plurality of device-side terminals electrically connected to the plurality of battery-side terminals of the battery pack, wherein when the battery cover is closed, the body housing, the battery mounting portion, and the A battery cover defines a battery housing space for housing the battery pack, and any one of the main body housing, the battery mounting portion, and the battery cover defining the battery housing space is connected to the air passage and the battery housing. A suction hole communicating with the space may be provided, and the suction hole may be provided above the plurality of device-side terminals in the battery housing space when the work machine is in a working state.

In one or more embodiments, the battery pack may be attachable/detachable to/from the battery mounting portion by sliding in a sliding direction relative to the battery mounting portion. The sliding direction is such that the first direction in which the battery pack slides when the battery pack is attached to the battery attachment portion is the second direction in which the battery pack slides when the battery pack is removed from the battery attachment portion. You may incline below rather than the direction side. The battery mounting portion is inclined in the sliding direction, and has an inclined surface on which the suction hole and the plurality of device-side terminals are arranged side by side in the sliding direction. The hole may be provided on the second direction side of the plurality of device-side terminals.

According to the above configuration, the water sucked into the battery housing space flows along the inclined surface of the battery mounting portion from the second direction side toward the first direction side. Since the suction holes are provided closer to the second direction than the plurality of device-side terminals, most of the water flowing from the second direction to the first direction is sucked into the suction holes. Therefore, it is possible to further prevent water from adhering to the device-side terminals in the battery housing space. Therefore, it is possible to further suppress the device-side terminals in the battery housing space from being short-circuited through water.

In one or more embodiments, the suction holes may extend in a third direction orthogonal to the sliding direction and the vertical direction. The width of the suction hole in the third direction is larger than the width between two of the plurality of device-side terminals that are positioned on the outermost sides on both sides in the third direction. good too.

According to the above configuration, it is possible to further prevent water passing through the inclined surface of the battery mounting portion from adhering to the plurality of device-side terminals. Therefore, it is possible to further suppress the device-side terminals in the battery housing space from being short-circuited through water.

In one or more embodiments, the work machine may be a lawn mower.

Lawn mowers are sometimes used in environments where there is a possibility of water adhering to the body housing, such as when it is raining. Therefore, even if water adheres to the body housing, it is necessary to prevent the device-side terminals in the battery housing space from being short-circuited through water. According to the above configuration, even if water is sucked into the battery housing space, it is possible to prevent water from adhering to the plurality of device-side terminals. Therefore, in the lawn mower, it is possible to suppress short-circuiting between the device-side terminals in the battery housing space through water.

(First embodiment)
As shown in FIG. 1 , the lawn mower 2 includes a main unit 4 and a handle unit 6 . A pair of wheels 8 are provided on the front portion of the main unit 4 . As shown in FIG. 2, a rear portion of the main unit 4 is provided with a roller 10 extending in the left-right direction. A grass collection container 12 is detachably attached to the rear portion of the main unit 4 . The lawn mower 2 operates while being grounded on the ground.

(Configuration of main unit 4)
As shown in FIG. 1 , the body unit 4 includes a body housing 20 and an openable/closable battery cover 22 . The body housing 20 has a first upper housing 24, a second upper housing 26, an intermediate housing 28, a first lower housing 30 (see FIG. 3) and a second lower housing 32 (see FIG. 3). are doing. A right side 20a of the body housing 20 is provided with a right intake hole 20b extending in the front-rear direction. As shown in FIG. 2, the left surface 20c of the body housing 20 is provided with a left intake hole 20d extending in the front-rear direction. The right air intake hole 20b (see FIG. 2) and the left air intake hole 20d are formed by connecting the first upper housing 24 and the intermediate housing 28 together.

As shown in FIG. 3, an exhaust hole 20e is provided in the rear portion of the body housing 20. As shown in FIG. A space inside the body housing 20 accommodates a motor 40 , a blower fan 42 , a cutting blade 44 , and a control board (not shown). Motor 40 may be a brushless DC motor, a brushed DC motor, or other types of motors such as an AC motor. The control board controls the operation of the motor 40 . The motor 40 is provided between the first upper housing 24 and the intermediate housing 28 in the vertical direction. The intermediate housing 28 below the motor 40 is provided with an opening 28a. An output shaft 46 extending vertically is connected to the motor 40 . The output shaft 46 extends vertically through the opening 28a of the intermediate housing 28 . A first flange 52 and a second flange 54 are fixed to the lower end of the output shaft 46 via bolts 48 and washers 50 . The first flange 52 is provided above the second flange 54 . A blower fan 42 is fixed to the first flange 52 . The cutting blade 44 is sandwiched between the first flange 52 and the second flange 54 in the vertical direction. The blower fan 42 and the cutting blade 44 are provided between the intermediate housing 28 and the first lower housing 30 in the vertical direction. The cutting blade 44 is provided below the blower fan 42 . When the motor 40 rotates the output shaft 46, the output shaft 46, the first flange 52, the second flange 54, the blower fan 42, and the cutting blade 44 rotate integrally. An air passage AP through which air passes when the blower fan 42 is driven is defined in the space inside the body housing 20 .

A battery interface (hereinafter sometimes referred to as “IF”) portion 60 is provided at the rear portion of the first upper housing 24 of the main body housing 20 . Battery pack 200 can be attached to and detached from battery IF section 60 by sliding battery pack 200 with respect to battery IF section 60 in a sliding direction. As for the sliding direction, the mounting direction side in which battery pack 200 slides when battery pack 200 is mounted to battery IF section 60 is longer than the removal direction side in which battery pack 200 slides when battery pack 200 is removed from battery IF section 60 . sloping downwards.

As shown in FIG. 4, the battery IF section 60 includes an IF front surface 60a, an IF right surface 60b (see FIG. 5), an IF left surface 60c, an IF bottom surface 60d, an IF right rear surface 60e, an IF left rear surface 60f, and an IF center rear surface 60g. The IF front surface 60a extends in the left-right direction, is inclined so that the rear side is inclined downward, and faces upward and backward. As shown in FIG. 5, the IF right surface 60b extends in the front-rear direction and the up-down direction and faces left. As shown in FIG. 4, the IF left surface 60c extends in the front-rear direction and the up-down direction and faces rightward. The IF bottom surface 60d extends in the front-rear direction and the left-right direction and is arranged facing upward. A right drain hole 61a (see FIG. 5) vertically penetrating the first upper housing 24 is provided at the right end of the IF bottom surface 60d, and a right drain hole 61a (see FIG. 5) vertically penetrating the first upper housing 24 is provided at the left end of the IF bottom surface 60d. A left drain hole 61b is provided for this purpose. The IF center rear surface 60g extends in the left-right direction and the slide direction, and faces upward and forward. The IF center rear surface 60g is provided between the IF right rear surface 60e and the IF left rear surface 60f in the left-right direction. The IF right rear surface 60e and the IF left rear surface 60f extend in the front-rear direction and the left-right direction and are arranged facing upward. The battery IF portion 60 further includes peripheral ribs 62 surrounding an IF front surface 60a, an IF right surface 60b (see FIG. 5), an IF left surface 60c, an IF right rear surface 60e, an IF left rear surface 60f, and an IF central rear surface 60g. . A rear portion of the peripheral rib 62 is provided with a first engaged portion 62a with which a first engaging portion 22a (see FIG. 3) of the battery cover 22, which will be described later, engages.

Battery IF section 60 further includes a mounting unit 66 . As shown in FIG. 4, the mounting unit 66 includes a mounting housing 68, a terminal support portion 70, and three lawnmower terminals 72a-72c. The mounting unit 66 is arranged parallel to the sliding direction. The mounting housing 68 is screwed and fixed to the first upper housing 24 and the intermediate housing 28 . The mounting housing 68 is composed of a right mounting housing 74 and a left mounting housing 76 . A first right rail 74b is provided at the right end of the right upper surface 74a of the right attachment housing 74 . A first left rail 76b is provided at the left end of the left upper surface 76a of the left mounting housing 76. As shown in FIG. A right notch 74c recessed rightward is provided in the rear portion of the right upper surface 74a of the right mounting housing 74. As shown in FIG. A left cutout portion 76c recessed leftward is provided in the rear portion of the left upper surface 76a of the left mounting housing 76. As shown in FIG. A suction hole 78 penetrating vertically through the mounting housing 68 is defined by the right notch 74 c of the right mounting housing 74 and the left notch 76 c of the left mounting housing 76 . A second engaged portion 80 is provided in front of the suction hole 78 in the mounting housing 68 . A second engaging portion 204a (see FIG. 6) of the battery pack 200, which will be described later, is engaged with the second engaged portion 80. As shown in FIG. The lateral width of the second engaged portion 80 is greater than the lateral width of the suction hole 78 . In this embodiment, the air intake hole area, which is the sum of the opening area of the right air intake hole 20b (see FIG. 1) and the opening area of the left air intake hole 20d (see FIG. 2) of the body housing 20, and the opening area of the suction hole 78 is about 20:1. The ratio of the intake hole area to the suction hole area is preferably between 15:1 and 25:1.

The terminal support portion 70 is held by the mounting housing 68 . A front portion of the terminal support portion 70 is provided with a protruding portion 70b protruding from the upper surface 70a in a direction perpendicular to the sliding direction. The three lawnmower-side terminals 72 a to 72 c are held by the terminal support portion 70 . The three lawnmower terminals 72a to 72c are arranged side by side in the left-right direction. The three lawnmower-side terminals 72a to 72c extend in the removal direction (rear side) from the projecting portion 70b, and extend in a direction (upward) orthogonal to the sliding direction from the upper surface 70a of the terminal support portion 70. ing. The lateral width of the suction hole 78 is smaller than the width between the rightmost lawnmower terminal 72a and the leftmost lawnmower terminal 72c. In the mounting unit 66, the suction hole 78 is provided on the mounting direction side (rear side) of the three lawnmower terminals 72a to 72c. That is, since the mounting unit 66 extends along the sliding direction, the suction hole 78 is provided above the three lawnmower-side terminals 72a to 72c. Specifically, the suction hole 78 is provided above the lower ends of the three lawnmower terminals 72a to 72c.

As shown in FIG. 3 , battery cover 22 is attached to body housing 20 so as to cover the outside of battery pack 200 attached to battery IF section 60 . In the following description of the battery cover 22, the description will be based on the up-down direction and the left-right direction when the battery cover 22 is closed. As shown in FIG. 1 , the front portion of the battery cover 22 is supported by the second upper housing 26 of the body housing 20 so as to be rotatable about a rotation shaft (not shown) extending in the left-right direction. As shown in FIG. 3, a first engaging portion 22a is provided. First engaging portion 22 a engages first engaged portion 62 a of peripheral rib 62 of battery IF portion 60 . In the battery cover 22, an operating portion 22b that protrudes rearward is provided above the first engaging portion 22a. The operation portion 22b is inclined so that the front side is positioned downward. The user can open and close the battery cover 22 using the operation unit 22b. A battery housing space BS is defined by the body housing 20 , the battery cover 22 , and the battery IF section 60 . The suction hole 78 communicates between the battery housing space BS and the air passage AP inside the body housing 20 .

(Configuration of handle unit 6)
As shown in FIG. 1 , the handle unit 6 is connected to the rear upper portion of the main unit 4 . The handle unit 6 includes a grip 90 to be gripped by the user, a lever 92, and a lock-off button 94. When the user pulls up the lever 92 while pushing the lock-off button 94, power is supplied from the battery pack 200 (see FIG. 3) to the motor 40 (see FIG. 3). On the other hand, even if the operator pulls up the lever 92 without pressing the lock-off button 94, power is not supplied from the battery pack 200 (see FIG. 3) to the motor 40 (see FIG. 3). That is, when the operator pulls up the lever 92 while pushing the lock-off button 94, the blower fan 42 and the cutting blade 44 (see FIG. 3) are driven.

(Configuration of battery pack 200)
As shown in FIG. 6, battery pack 200 includes battery housing 202 . The battery housing 202 accommodates a plurality of battery cells (not shown). The battery housing 202 includes a hook 204 , a second right rail 206 provided at the right end of the battery housing 202 , and a second left rail 208 provided at the left end of the battery housing 202 . The second right rail 206 and the second left rail 208 have shapes corresponding to the first right rail 74b and the first left rail 76b (see FIG. 4) of the lawn mower 2, respectively. The hook 204 has a second engaging portion 204a and a battery operating portion 204b. The hook 204 is biased toward the outside of the battery housing 202 by a spring (not shown). When the battery pack 200 is attached to the battery IF portion 60 (see FIG. 4) of the lawn mower 2, the second engaging portion 204a of the hook 204 engages the second engaged portion formed in the battery IF portion 60 of the lawn mower 2. The battery pack 200 is fixed to the battery IF section 60 by entering the joining section 80 (see FIG. 3). When the battery operating portion 204b of the hook 204 is pushed up from this state, the second engaging portion 204a is pulled out of the second engaged portion 80 (see FIG. 3). In this state, battery pack 200 can be slid with respect to battery IF section 60 and battery pack 200 can be removed from battery IF section 60 .

As shown in FIG. 4, in this embodiment, the lateral width of the suction hole 78 is smaller than the lateral width of the second engaging portion 204a. Suppose that the lateral width of suction hole 78 is larger than the lateral width of second engaging portion 204a (see FIG. 6), and battery pack 200 (see FIG. 6) is removed from battery IF portion 60. Suppose. First, the user pushes up the battery operating portion 204b (see FIG. 6) of the hook 204. Then, as shown in FIG. As a result, the second engaging portion 204 a (see FIG. 6) is pulled out of the second engaged portion 80 . Then, the user moves the battery pack 200 (see FIG. 6) to the removal direction side with respect to the battery IF section 60 . The user releases the finger from the battery operating portion 204b (see FIG. 6) between the second engaged portion 80 and the suction hole 78, and removes the battery pack 200 (see FIG. 6) from the battery IF portion 60. Move further outward. If the lateral width of the suction hole 78 is larger than the lateral width of the second engaging portion 204 a (see FIG. 6 ), the second engaging portion 204 a (see FIG. 6 ) will enter the suction hole 78 . In this case, the user needs to push up the battery operating portion 204b (see FIG. 6) again to pull the second engaging portion 204a (see FIG. 6) out of the suction hole 78. In order to avoid such a situation, the user should hold the battery operating portion 204b (see FIG. 6) until the second engaging portion 204a (see FIG. 6) is moved toward the removal direction side of the suction hole 78. ) must be pushed up. Such an operation is troublesome for the user. Therefore, in this embodiment, the lateral width of the suction hole 78 is smaller than the lateral width of the second engaging portion 204a (see FIG. 6). With such a configuration, the second engaging portion 204a (see FIG. 6) does not enter the suction hole 78. As shown in FIG. That is, the user does not need to push up the battery operating portion 204b (see FIG. 6) after the second engaging portion 204a (see FIG. 6) is pulled out of the second engaged portion 80. FIG. Therefore, user convenience can be improved.

Next, the operation of the lawn mower 2 will be described with reference to FIGS. 3 and 7. FIG. In FIG. 3, when the user pulls up the lever 92 (see FIG. 1) while pushing the lock-off button 94 (see FIG. 1), power is supplied from the battery pack 200 to the motor 40, and the blower fan 42 and the mower are supplied. Blade 44 is driven. The lawn is mowed by driving the cutting blade 44 . Further, when the blower fan 42 is driven, inside the body housing 20, the air near the motor 40 is drawn into the blower fan 42 side, and the vicinity of the motor 40 becomes a negative pressure state. In this case, air is drawn into the body housing 20 (more specifically, near the motor 40) from the right side air intake hole 20b (see FIG. 1) and the left side air intake hole 20d (see FIG. 2) of the body housing 20. Become. The blower fan 42 creates an air flow F1 flowing from the vicinity of the motor 40 toward the blower fan 42 in the space inside the main body housing 20, and an air flow F1 from the vicinity of the motor 40 toward the grass collecting container 12 (see FIG. 1). flows F2 and . As a result, grass cut by the cutting blade 44 passes through the exhaust hole 20e and is fed into the grass collection container 12 (see FIG. 1). Also, the motor 40 is cooled. The air in the battery housing space BS is also sucked into the inside of the body housing 20 (specifically, near the motor 40).

Generally, the battery housing space BS is designed to be sealed when the battery cover 22 is closed. However, a minute gap may exist between the first upper housing 24 and the mounting housing 68 in, for example, the battery IF section 60 . Therefore, when the blower fan 42 is driven, the air in the battery housing space BS is sucked into the body housing 20 (specifically, the air passage AP) through the minute gap. In this case, the inside of the battery accommodation space BS becomes a negative pressure state. Under such circumstances, if water adheres to the first upper housing 24 in the vicinity of the lower end of the battery cover 22, the water on the first upper housing 24 will flow into the battery housing space BS as indicated by arrow F3 in FIG. can be sucked into If the battery IF section 60 did not have the suction hole 78, the water sucked into the battery housing space BS would flow through the IF central rear surface 60g, the right upper surface 74a of the right mounting housing 74, and the left upper surface of the left mounting housing 76. Water adheres to the three lawnmower-side terminals 72a to 72c through the upper surface 70a of the terminal support portion 70 and the upper surface 70a of the terminal support portion . In this case, the three lawnmower terminals 72a to 72c may be short-circuited. Therefore, in this embodiment, a suction hole 78 is provided in the battery IF section 60 . In this case, even if water is sucked into the battery accommodation space BS, the water sucked into the battery accommodation space BS passes through the IF center rear surface 60g and is sucked into the suction hole 78 as indicated by the arrow F4 in FIG. be rare. That is, water is sucked into the air passage AP from the suction hole 78 before the three lawnmower terminals 72a to 72c. As a result, the water sucked into the battery housing space BS does not adhere to the three lawnmower terminals 72a to 72c. Therefore, it is possible to prevent the three lawnmower-side terminals 72a to 72c from being short-circuited. The water sucked into the suction hole 78 passes through the space inside the body housing 20 and is discharged to the outside. Hereinafter, the IF central rear surface 60g, the right upper surface 74a of the right mounting housing 74, the left upper surface 76a of the left mounting housing 76, and the upper surface 70a of the terminal support portion 70 may be collectively referred to as "inclined surface". .

In one or more embodiments, as shown in FIGS. 3 and 7, a lawn mower 2 (an example of a “working machine”) includes a cutting blade 44 (an example of a “working unit”) and a blower fan 42. , a motor 40 for driving a cutting blade 44 and a blower fan 42; a body housing 20 having a right side air intake hole 20b and a left side air intake hole 20d; a battery cover 22 that is provided in the body housing 20 and that can be opened and closed to cover the battery pack 200 attached to the battery IF section 60; and three lawnmower-side terminals 72 a to 72 c (an example of “plurality of device-side terminals”) electrically connected to the plurality of battery-side terminals of the pack 200 . When the battery cover 22 is closed, the body housing 20 , the battery IF section 60 , and the battery cover 22 define a battery housing space BS that houses the battery pack 200 . The body housing 20 defining the battery housing space BS, the battery IF section 60, and the battery IF section 60 of the battery cover 22 are provided with a suction hole 78 that communicates the air passage AP with the battery housing space BS. A suction hole 78 is provided above the three lawn mower-side terminals 72a to 72c in the battery housing space BS when the lawn mower 2 is grounded (an example of the "working state"). Water sucked into the battery housing space BS flows downward from above. According to the above configuration, the water sucked into the battery housing space BS by driving the blower fan 42, before reaching the three lawnmower-side terminals 72a to 72c provided on the lower side, It is sucked into a suction hole 78 provided on the upper side. Therefore, it is possible to prevent water from adhering to the three lawnmower terminals 72a to 72c in the battery housing space BS. Therefore, it is possible to prevent the three lawnmower terminals 72a to 72c in the battery housing space BS from being short-circuited through water. Also, the lawn mower 2 may be used in an environment where there is a possibility that water may adhere to the main body housing 20, such as where it is raining. Therefore, even if water adheres to the body housing 20, it is necessary to prevent the three lawnmower-side terminals 72a to 72c in the battery housing space BS from being short-circuited through water. According to the above configuration, even if water is sucked into the battery housing space BS, it is possible to prevent the water from adhering to the three lawnmower-side terminals 72a to 72c. It is possible to prevent the three lawnmower-side terminals 72a to 72c in the BS from being short-circuited through water.

In one or more embodiments, as shown in FIGS. 3 and 7, battery pack 200 is attachable to and detachable from battery IF section 60 by sliding relative to battery IF section 60 in a sliding direction. The sliding direction is such that the mounting direction (an example of the “first direction”) in which battery pack 200 is slid when battery pack 200 is mounted on battery IF section 60 is the battery pack 200 slide direction when battery pack 200 is removed from battery IF section 60 . It is inclined downward from the side of the removal direction (an example of the “second direction”) in which the 200 is slid. The battery IF section 60 is inclined in the sliding direction and has an inclined surface on which a suction hole 78 and three lawnmower-side terminals 72a to 72c are arranged side by side in the sliding direction. The hole 78 is provided on the removal direction side of the three lawnmower terminals 72a to 72c. According to the above configuration, water sucked into battery housing space BS flows along the inclined surface of battery IF section 60 from the removal direction side toward the attachment direction side. Since the suction hole 78 is provided on the removal direction side of the three lawnmower terminals 72a to 72c, most of the water flowing from the removal direction side toward the installation direction side is sucked into the suction hole 78. be rare. Therefore, it is possible to further prevent water from adhering to the three lawnmower terminals 72a to 72c in the battery housing space BS. Therefore, it is possible to further prevent the three lawnmower terminals 72a to 72c in the battery housing space BS from being short-circuited through water.

(Second embodiment)
Next, a lawnmower of a second embodiment will be described with reference to FIG. In the lawn mower of the second embodiment, the shape of the suction hole 378 is different from the shape of the suction hole 78 of the lawn mower 2 of the first embodiment.

As shown in FIG. 8, a right notch 374c recessed rightward is provided in the rear portion of the right upper surface 74a of the right mounting housing 74. As shown in FIG. A left notch 376c recessed leftward is provided in the rear portion of the left upper surface 76a of the left mounting housing 376. As shown in FIG. A suction hole 378 penetrating vertically through the mounting housing 68 is defined by the right notch 374 c of the right mounting housing 74 and the left notch 376 c of the left mounting housing 76 . The right end of the right cutout portion 374c is located to the right of the lawn mower terminal 72a, which is the rightmost of the three lawn mower terminals 72a to 72c. The left end of the left notch 376c is located to the left of the leftmost lawn mower terminal 72c among the three lawn mower terminals 72a to 72c. Therefore, the lateral width of the suction hole 378 is larger than the lateral width between the rightmost lawnmower terminal 72a and the leftmost lawnmower terminal 72c. big. Also, the width of the suction hole 378 in the left-right direction is larger than the width of the second engaged portion 80 .

In one or more embodiments, suction holes 378 extend in the left-right direction (an example of a "third direction"). The width of the suction hole 378 in the left-right direction is greater than the width between the two lawn-mower terminals 72a and 72c located on the outermost sides on both sides in the left-right direction among the three lawn-mower terminals 72a to 72c. . According to the above configuration, water passing through the inclined surface of battery IF section 60 can be further suppressed from adhering to three lawnmower-side terminals 72a-72c. Therefore, it is possible to further prevent the three lawnmower terminals 72a to 72c in the battery housing space BS from being short-circuited through water.

(First Modification) The "working machine" is not limited to the lawnmower 2 that operates while being grounded. A "working machine" may be a hand-held working machine such as a chain saw, a pole saw, a mower, a hedge trimmer, or the like. Also, the "work machine" may be a shoulder-mounted sprayer. Also, the "working machine" may be a grounded high-pressure washing machine. Also, the "work machine" may be a scarifier, a cultivator, or the like that operates while being grounded.

(Second Modification) The suction hole 78 may be provided on the mounting direction side, left side, or right side of the three lawnmower terminals 72a to 72c. In other words, the suction hole 78 may be provided at a position above the three lawnmower terminals 72a to 72c to suck the water sucked into the battery housing space BS. Also, the body housing 20 defining the battery housing space BS or the battery cover 22 may have a suction hole.

(Third Modification) The sliding direction may be perpendicular to the vertical direction or may be parallel to a plane including the front-rear direction and the left-right direction.

(Fourth Modification) The lateral width of the suction hole 78 of the first embodiment is determined by the difference between the rightmost lawnmower terminal 72a and the leftmost lawn mower terminal 72c. It may be the same as the width in the left-right direction between them, or it may be the same as the width of the second engaged portion 80 .

(Fifth Modification) The lawn mower 2 may have a plurality of suction holes. The plurality of suction holes may be arranged side by side in the left-right direction, or may be arranged side by side in the sliding direction.

2: Lawn mower 4: Main unit 6: Handle unit 8: Wheel 10: Roller 12: Grass container 20: Main housing 20a: Right surface 20b: Right air intake 20c: Left surface 20d: Left air intake 20e: Exhaust hole 22: Battery Cover 22a: First engaging portion 22b: Operating portion 24: First upper housing 26: Second upper housing 28: Intermediate housing 28a: Opening 30: First lower housing 32: Second lower housing 40: Motor 42: Blower fan 44: cutting blade 46: output shaft 48: bolt 50: washer 52: first flange 54: second flange 60: battery IF section 60a: IF front surface 60b: IF right surface 60c: IF left surface 60d: IF bottom surface 60e: IF right rear surface 60f: IF left rear surface 60g: IF center rear surface 61a: right drainage hole 61b: left drainage hole 62: peripheral rib 62a: first engaged portion 66: mounting unit 68: mounting housing 70: terminal support portion 70a: upper surface 70b: Protruding portion 72a: lawn mower terminal 72b: lawn mower terminal 72c: lawn mower terminal 74: right mounting housing 74a: right upper surface 74b: first right rail 74c: right notch 76: left mounting housing 76a: left upper surface 76b : First left rail 76c : Left notch 78 : Suction hole 80 : Second engaged portion 90 : Grip 92 : Lever 94 : Lock off button 200 : Battery pack 202 : Battery housing 204 : Hook 204a : Second engagement Part 204b: Battery operation part 206: Second right rail 208: Second left rail 374c: Right cutout 376: Left mounting housing 376c: Left cutout 378: Suction hole AP: Air passage BS: Battery housing space

Claims (4)

a working department;
blower fan and
a motor that drives the working unit and the blower fan;
a body housing having an intake hole and an exhaust hole;
a battery pack attachable to and detachable from the battery attachment portion of the body housing;
a battery cover that is provided in the body housing and that can be opened and closed to cover the battery pack attached to the battery attachment portion;
a plurality of device-side terminals extending upward from the battery mounting portion and electrically connected to the plurality of battery-side terminals of the battery pack;
An air passage through which air flows from the intake hole to the exhaust hole when the blower fan is driven is provided inside the body housing,
A battery housing space for housing the battery pack is defined by the body housing, the battery mounting portion, and the battery cover when the battery cover is closed,
any one of the main body housing, the battery mounting portion, and the battery cover defining the battery housing space includes a suction hole communicating the air passage and the battery housing space,
A working machine, wherein the suction hole is provided above the plurality of device-side terminals in the battery housing space in a working state of the working machine. The battery pack is attachable to and detachable from the battery mounting portion by sliding the battery pack in a sliding direction with respect to the battery mounting portion,
The sliding direction is such that the first direction in which the battery pack slides when the battery pack is attached to the battery attachment portion is the second direction in which the battery pack slides when the battery pack is removed from the battery attachment portion. It is inclined downward from the direction side,
The battery mounting portion is inclined in the sliding direction, and has an inclined surface on which the suction hole and the plurality of device-side terminals are arranged side by side in the sliding direction,
The working machine according to claim 1 , wherein the suction hole is provided on the inclined surface closer to the second direction than the plurality of device-side terminals. The suction hole extends in a third direction orthogonal to the sliding direction and the vertical direction,
The width of the suction hole in the third direction is greater than the width between two of the plurality of device-side terminals that are positioned outermost on both sides in the third direction, The working machine according to claim 2. The work machine according to any one of claims 1 to 3, wherein the work machine is a lawn mower.

Images