JP2023132056A - Work machine - Google Patents

Abstract

To provide a work machine, which is configured to prevent water from intruding into a motor storage part.SOLUTION: A work machine comprises a main body part having a motor storage part and a working part mounted on the main body part. The main body part comprises a fan stored in the motor storage part, and a motor stored in the motor storage part. The motor storage part comprises a wall part positioned closer to a first side than the motor in an axial direction of the motor to define the motor storage part, and a first air-intake opening part provided in the wall part. The wall part comprises: a diameter reduction part whose diameter gradually reduces as going from a second side toward a first side in the axial direction; a bell-mouth part provided at an end part at a first side of the diameter reduction part, which defines the first air-intake opening part; and water-proof groove part provided between the end part at the first side of the diameter reduction part and the bell-mouth part or in the bell-mouth part, in the axial direction, which is dented from an outer peripheral surface of the wall part.SELECTED DRAWING: Figure 8

Description

The technology disclosed herein relates to a work machine.

Patent Document 1 discloses a working machine that includes a main body having a motor accommodating part and a working part attached to the main body. The main body includes a fan housed in a motor housing, and a motor that is housed in the motor housing and drives the working unit and the fan. The motor accommodating portion is located on a first side of the motor in the axial direction of the motor, and includes a wall portion that defines the motor accommodating portion, and an intake opening provided in the wall portion.

Japanese Patent Application Publication No. 2002-210705

In the work machine of Patent Document 1, when the fan is driven, water adhering to the wall of the motor housing flows into the motor housing through the intake opening. If water enters the motor housing, water may adhere to the motor.

This specification provides a technique that can suppress water from entering a motor housing in a working machine.

A work machine disclosed in this specification includes a main body having a motor accommodating part, a working part attached to the main body, and a fan housed in the motor accommodating part. a motor that is accommodated in the motor accommodating section and drives the working section and the fan; the motor accommodating section is located on a first side of the motor in the axial direction of the motor; The wall portion defines the motor accommodating portion, and the wall portion includes a first intake opening provided in the wall portion, and the wall portion is located on the second side in the axial direction, and the wall portion defines the motor accommodating portion. a diameter-reducing portion that decreases in diameter as it goes from the second side opposite to the first side in the direction toward the first side; and a diameter-reducing portion provided at an end on the first side of the diameter-reducing portion. between the bell mouth portion defining the first intake opening and the end of the first side of the reduced diameter portion in the axial direction, or A waterproof groove part provided in the bell mouth part and recessed from the outer circumferential surface of the wall part may be provided.

According to the above configuration, when water flows along the reduced diameter portion of the wall of the motor accommodating portion, it enters the waterproof groove portion before reaching the first intake opening. The water that has entered the waterproof groove flows downward without reaching the first intake opening. Therefore, the amount of water reaching the intake opening can be further reduced. Therefore, it is possible to further suppress water from entering the motor accommodating portion.

FIG. 2 is a perspective view of the chainsaw 2 according to the first embodiment, viewed from the rear left and upper side. It is a left side view of the chainsaw 2 of the first embodiment seen from the left. FIG. 2 is a perspective view of the chainsaw 2 of the first embodiment seen from the rear right and upper side. FIG. 2 is a perspective view of the chainsaw 2 with the battery cover 50 and the battery pack 200 removed from the rear left and upper side in the first embodiment. FIG. 2 is a perspective view of the chainsaw 2 with the battery cover 50 and the battery pack 200 removed from the front right and upper side in the first embodiment. FIG. 2 is a left sectional view of the chainsaw 2 in the first embodiment when viewed from the left. FIG. 2 is a front sectional view of a chainsaw 2 in a first embodiment seen from the front. FIG. 2 is a front sectional view of a chainsaw 2 in a first embodiment seen from the front. FIG. 2 is a perspective view of the fan 110 of the first embodiment, viewed from the front left and upper side. FIG. 2 is a perspective view of the fan 110 with the cover removed from the front left and upper side in the first embodiment. FIG. 3 is a front sectional view of the fan 110 in the first embodiment, seen from the front. FIG. 6 is a perspective view of the inner housing 86, the fan 110, the duct 130, and the mounting unit 66 in the first embodiment, viewed from the rear left and upper side. FIG. 2 is a front sectional view of a chainsaw 2 in a first embodiment seen from the front. FIG. 6 is a perspective view of the inner housing 86, the motor unit 82, the duct 130, and the mounting unit 66 in the first embodiment, viewed from the upper rear right side. FIG. 2 is a perspective view of the battery pack 200 in the first embodiment seen from the front right and lower side. FIG. 3 is a front cross-sectional view of a chainsaw 302 in a second embodiment seen from the front. FIG. 4 is a front cross-sectional view of a chainsaw 402 according to a third embodiment, seen from the front. It is a top sectional view seen from the front of a chainsaw 402 in a third example.

Below, typical and non-limiting specific examples of the present invention will be described in detail with reference to the drawings. This detailed description is merely intended to provide those skilled in the art with details for implementing the preferred embodiment of the invention, and is not intended to limit the scope of the invention. Additionally, the additional features and inventions disclosed below can be used separately or in conjunction with other features and inventions to provide further improved work machines and methods of making and using them.

Furthermore, the features and combinations of steps disclosed in the following detailed description are not essential to practicing the invention in its broadest sense, and are intended solely for the purpose of specifically illustrating representative embodiments of the invention. shall be described. Moreover, various features of the exemplary embodiments above and below, as well as those recited in the independent and dependent claims, are hereby described in providing additional and useful embodiments of the invention. They do not have to be combined exactly as shown in the specific examples given or in the order listed.

All features recited in the specification and/or claims, apart from constitution of the features in the examples and/or claims, are included as limitations on the original disclosure and specificity claimed. are intended to be disclosed individually and independently of each other. Furthermore, all references to numerical ranges and groups or populations are intended to disclose intermediate configurations thereof as limitations on the original disclosure and the specific claimed subject matter.

In one or more embodiments, the work machine includes a main body having a motor housing, and a working part attached to the main body, the body being housed in the motor housing. and a motor that is housed in the motor housing and drives the working part and the fan, and the motor housing is located on a first side of the motor in the axial direction of the motor. and a first intake opening provided in the wall; a diameter-reducing portion that decreases in diameter from the second side opposite to the first side in the axial direction toward the first side, the first side of the diameter-reducing portion; a bell mouth portion extending radially outward from a first side end of the reduced diameter portion, the first intake opening being defined by an end of the reduced diameter portion; A waterproof groove may be provided between the first side end of the diameter portion and the bell mouth portion, and recessed from the outer circumferential surface of the wall toward the inside of the motor accommodating portion. .

In one or more embodiments, the depth of the watertight groove may vary along the circumference.

When molding a wall portion including a reduced diameter portion, a bell mouth portion, and a waterproof groove portion, a manufacturing method may be considered in which two molds are used to mold the wall portion. When two molds are used, if the depth of the waterproof groove is constant over the entire circumference, it will be difficult to remove the mold. According to the above configuration, mold cutting can be facilitated. Therefore, it is possible to further suppress water from entering the motor accommodating portion, and it is also possible to easily form the wall portion including the reduced diameter portion, the bell mouth portion, and the waterproof groove portion.

In one or more embodiments, in the working state of the work machine, the depth of the waterproof groove in the upper and lower parts is a maximum depth, and the depth of the waterproof groove in the left and right parts is a minimum depth. It may be as deep as

Of the water that flows down the wall, a relatively large amount of water reaches the upper part of the waterproof groove. According to the above configuration, the upper part of the waterproof groove section has the deepest depth. Therefore, it is possible to prevent water accumulated in the upper part of the waterproof groove from going over the bell mouth part. Therefore, it is possible to further suppress water from entering the motor accommodating portion.

In one or more embodiments, the body portion may include a body housing that houses the motor housing. One or more second intake openings may be provided on the outer peripheral surface of the main body housing. In the working state of the working machine, at least one second intake opening of the one or more second intake openings is located above the first intake opening, and in the axial direction, at least one second intake opening is located above the first intake opening. The second air intake opening may be provided on the second side in the axial direction than the first air intake opening.

According to the above configuration, water adhering to the outer circumferential surface of the main body flows into the second intake opening. The water that has flowed into the second intake opening adheres to the wall of the motor housing. Water adhering to the wall of the motor accommodating portion flows from the second side in the axial direction to the first side. On the way from the second side to the first side, some of the water flows downward. Further, a portion of the water flowing through the wall of the motor accommodating portion from the second side to the first side is dammed up by the waterproof groove. Therefore, water flowing in from the second intake opening can be prevented from entering the motor accommodating part.

In one or more embodiments, the work implement may be a chainsaw.

Chainsaws are sometimes used in environments where water may adhere to the main body, such as in rainy areas. Therefore, even if water adheres to the main body, it is necessary to prevent water from entering the motor housing space. According to the above configuration, it is possible to suppress water from entering the motor housing space, which is useful.

(First example)
As shown in FIG. 1, the chainsaw 2 includes a main body 4, a guide bar 6, and a saw chain 8. The guide bar 6 is an elongated plate-shaped member attached to the main body 4 so as to protrude forward from the main body 4. The guide bar 6 is made of a metal material such as iron. The saw chain 8 includes a plurality of interconnected cutters and is attached along the periphery of the guide bar 6. In the following explanation, when the chainsaw 2 is placed on a horizontal mounting surface S such as the ground, the direction perpendicular to the mounting surface S will be referred to as the vertical direction of the chainsaw 2, as shown in FIG. The direction in which the longitudinal direction of the guide bar 6 is projected onto the surface S is referred to as the front-rear direction of the chainsaw 2, and the direction orthogonal to the up-down direction and the front-rear direction of the chainsaw 2 is referred to as the left-right direction of the chainsaw 2.

As shown in FIG. 1, the main body 4 includes a main body housing 10, a front hand guard 12, a front handle 14, a sprocket cover 16 (see FIG. 3), a battery accommodating part 18, a rear handle 20, A rear hand guard 22 is provided. The main body housing 10 includes a left housing 24 and a right housing 26. The main body housing 10 has a substantially rectangular parallelepiped shape with its longitudinal direction extending in the front-rear direction of the main body portion 4 .

A front intake portion 30 that protrudes leftward is provided on the left side of the left housing 24 . The front intake section 30 has a truncated conical section 32 and a flat plate section 34. The flat plate portion 34 is provided at the left end of the truncated cone portion 32. The diameter of the truncated cone portion 32 increases from left to right. The truncated cone portion 32 is provided with a plurality of outer intake openings 32a. The plurality of outer air intake openings 32a are arranged in a line in the circumferential direction of the truncated cone portion 32. Each of the plurality of outer air intake openings 32a has a long hole shape, and has a longitudinal direction along the direction in which the generatrix of the truncated cone portion 32 extends.

The front handle 14 includes a left side fixing part 14a extending leftward from the front lower part of the left side housing 24 (specifically, the front intake part 30), and a left side grip part 14b extending upward from the left end of the left side fixing part 14a. An upper grip part 14c extends rightward from the upper end of the left grip part 14b, a right grip part 14d extends rearward and downward from the right end of the upper grip part 14c, and a right grip part 14d extends downward from the lower end of the right grip part 14d. The right side fixing part 14e (see FIG. 3) is provided. The left side fixing part 14a is screwed and fixed to the front lower part of the left side housing 24. As shown in FIG. 3, the right side fixing portion 14e is screwed and fixed to the right housing 26 on the rear side of the sprocket cover 16. The front hand guard 12 is rotatably supported at the front upper part of the main body housing 10. The front hand guard 12 is provided forward of the front handle 14. The front hand guard 12 protects the hand of the user who grips the upper grip portion 14c of the front handle 14.

The rear handle 20 extends rearward and downward from the upper rear surface of the main body housing 10, and is bent downward. The rear hand guard 22 extends rearward from the lower rear surface of the main body housing 10 and is connected to the lower end of the rear handle 20. The rear hand guard 22 includes a first guard part 22a disposed directly below the rear handle 20, and a second guard part 22b extending rightward from the first guard part 22a. The rear hand guard 22 protects the user's hand holding the rear handle 20.

A power button 40 is disposed on the upper surface near the front end of the rear handle 20 to enable the user to turn on/off the power of the chainsaw 2. A trigger lever 42 for a user to operate the rotational drive of the saw chain 8 is arranged on the lower surface near the front end of the rear handle 20. A lock lever 44 is disposed on the upper surface of the rear handle 20 and is configured to switch between a state in which operation of the trigger lever 42 by the user is permitted and a state in which it is prohibited. When using the chainsaw 2, the user holds the chainsaw 2 by grasping the rear handle 20 with his right hand and the front handle 14 with his left hand. From this state, when the user presses down the lock lever 44 of the rear handle 20 with the palm of his right hand, the user is allowed to operate the trigger lever 42. In this state, when the user pulls up the trigger lever 42 with the index finger of his right hand, the saw chain 8 is rotationally driven.

The battery housing section 18 is provided between the front handle 14 and the rear handle 20. The battery housing section 18 includes an openable/closable battery cover 50 and a battery interface (hereinafter sometimes referred to as "IF") section 52 (see FIG. 4). As shown in FIG. 4, the battery IF section 52 includes an IF front surface 54, an IF right surface 56, an IF rear surface 58 (see FIG. 5), an IF left surface 60 (see FIG. 5), and an IF bottom surface 62. ing. The IF front surface 54 extends along the left-right direction and the up-down direction, and is arranged facing rearward. The IF right surface 56 extends along the front-rear direction and the up-down direction, and is arranged facing left. The IF bottom surface 62 extends along the front-rear direction and the left-right direction, and is arranged facing upward. As shown in FIG. 5, the IF rear surface 58 extends along the left-right direction and the up-down direction, and is disposed facing forward. The IF left surface 60 extends along the front-rear direction and the up-down direction, and is disposed facing right.

As shown in FIG. 4, the IF front surface 54 is provided with an IF side intake opening 54a. As shown in FIG. 6, an intake pipe 64 is connected to the IF side intake opening 54a. The intake pipe 64 is made of, for example, a rubber material. Note that in a modified example, the intake pipe 64 may be formed of resin or the like. The intake pipe 64 includes a first air passage 64a extending forward from the IF side intake opening 54a, and a second air passage 64b bent from the front end of the first flow passage and extending downward. The opening of the end 64c of the second air passage 64b faces vertically downward. In this embodiment, the intake pipe 64 is attached to the IF front surface 54 so that the opening of the end 64c faces vertically downward when the chainsaw 2 is in the state shown in FIG. In a modification, the intake pipe 64 may be rotatably attached to the IF side intake opening 54a such that the opening of the end 64c faces vertically downward regardless of the state of the chainsaw 2.

As shown in FIG. 7, the IF right surface 56 has a right opening 56a formed therein. A mounting unit 66 is provided in the right opening 56a. As shown in FIG. 4, the front end of the mounting unit 66 is provided with a first front rail 66a that extends in the vertical direction, and the rear end is provided with a first rear rail 66b that extends in the vertical direction. ing. The mounting unit 66 holds five device-side terminals 68. The five device-side terminals 68 are provided between the first front rail 66a and the first rear rail 66b, and are arranged side by side in the front-rear direction. An inner exhaust hole 66c is provided at the bottom of the mounting unit 66. As shown in FIG. 7, an outer exhaust hole 66d is formed at the lower rear surface of the mounting unit 66. A battery housing space BS is defined by the battery cover 50 and the battery IF section 52. As shown in FIG. 6, a seal member 53 is disposed at a location where the battery cover 50 and the battery IF section 52 come into contact when the battery cover 50 is closed. Therefore, when the battery cover 50 is closed, the inside of the battery housing section 18 is sealed.

As shown in FIG. 6, a rear intake opening 70 is provided at the lower rear surface of the main body housing 10. As shown in FIG. The rear intake opening 70 has a long hole shape, and has a longitudinal direction along the left-right direction. A sponge 72 is attached to the rear intake opening 70. The sponge 72 allows air to enter the main body housing 10 while suppressing water and dust from entering the main body housing 10.

A control unit 80, a motor unit 82, an oil tank 84, and an inner housing 86 are arranged at the front inside the main body housing 10. The control unit 80, the motor unit 82, and the oil tank 84 are arranged ahead of the battery housing section 18. Control unit 80 is arranged above motor unit 82. The oil tank 84 stores lubricating oil for lubricating the saw chain 8. A motor accommodating portion 88 that accommodates the motor unit 82 is provided at the front inside the main body housing 10 . The motor housing section 88 is defined by the left housing 24 (see FIG. 8), the right housing 26, the control unit 80, the oil tank 84, and the inner housing 86. A front exhaust opening 88a is formed at the front surface of the motor accommodating portion 88. The motor unit 82 is fixed to the left housing 24 with screws.

The motor unit 82 includes a motor cover 90 and a motor 92. Motor cover 90 has a waterproof structure. As shown in FIG. 8, the motor cover 90 includes a cover main body part 94 and a lid part 96. The cover main body part 94 has a main body side disc part 94a, a first cylindrical part 94b having a cylindrical shape, and a second cylindrical part 94c having a cylindrical shape. A main body side opening 94e is provided in the center of the main body side disc portion 94a. The first cylindrical portion 94b extends leftward from the radially outer end of the main body side disc portion 94a. The second cylindrical portion 94c extends rightward from the outer peripheral end of the main body side opening 94e of the main body side disc portion 94a. The first cylindrical portion 94b is provided with a plurality of fins 94d extending radially outward. The lid portion 96 has a lid-side disk portion 96a. A lid-side circular opening 96b is provided in the center of the lid-side disc portion 96a. The lid-side disk portion 96a covers the opening at the left end of the first cylindrical portion 94b.

The motor 92 is waterproofed by a motor cover 90. The motor 92 is an inner rotor type DC brushless motor. The motor 92 includes a stator 100, a rotor 102 disposed inside the stator 100, an output shaft 104 disposed passing through the center of the stator 100 and the rotor 102, and coupled to the rotor 102. It is equipped with The output shaft 104 extends along the axial direction A. The axial direction A is parallel to the left-right direction. The left end of the output shaft 104 is located to the left of the left end of the motor cover 90, and the right end of the output shaft 104 is located to the right of the right end of the motor cover 90. That is, the output shaft 104 passes through the motor cover 90 in the left-right direction. In the motor cover 90, a plurality of waterproof members 90a are provided at locations through which the output shaft 104 passes.

A worm gear 105 and a sprocket 106 are fixed to the right end of the output shaft 104. The left end of the sprocket 106 is fitted into the worm gear 105, and the right end is provided with a brake drum 107. A saw chain 8 (see FIG. 1) is spanned over the sprocket 106 from the guide bar 6. When the motor 92 is driven, the sprocket 106 rotates together with the output shaft 104, thereby causing the saw chain 8 to rotate around the sprocket 106 and the guide bar 6. When the user pushes down the front hand guard 12 (see FIG. 1) forward while the motor 92 is being driven, the rotation of the output shaft 104 is braked via the brake drum 107.

A fan 110 is attached to the left end of the output shaft 104 via a bush 108. As shown in FIG. 9, fan 110 is a so-called closed fan. The fan 110 includes a fan disk portion 112, a plurality of blade portions 114, and a cover portion 116. A central opening 112a is provided in the center of the fan disc portion 112. The fan disk portion 112 has a cylindrical rib portion 112b extending forward from the outer peripheral end of the central opening 112a. As shown in FIG. 10, the fan disk portion 112 and the plurality of blade portions 114 are integrally formed. The plurality of blade portions 114 extend to the left from the fan disk portion 112. The plurality of blade portions 114 have a shape in which the radially inner end portions are located more clockwise than the radially outer end portions when the fan 110 is viewed from the left. As shown in FIG. 9, the cover part 116 is welded to the left end of the blade part 114. A cover-side intake opening 116a is provided in the center of the cover portion 116. The diameter of the cover-side intake opening 116a is larger than the diameter of the central opening 112a. As shown in FIG. 11, a plurality of ventilation passages 110a are defined by the left surface of the fan disk portion 112, the right surface of the cover portion 116, and two circumferentially adjacent blade portions 114. As shown in FIG. 9, a plurality of fan exhaust openings 110b are defined on the outer peripheral surface of the fan 110 in the circumferential direction.

The inner housing 86 in FIG. 12 is fixed to the right housing 26 (see FIG. 1) with screws. As shown in FIG. 8, the left wall portion 86a of the inner housing 86 is provided with an inner air intake opening 120 and a waterproof portion 122. The waterproof portion 122 has a reduced diameter portion 122a and a bell mouth portion 122b. The diameter reducing portion 122a has an outer diameter and an inner diameter decreasing from the right side to the left side. The bell mouth portion 122b is provided at the left end of the reduced diameter portion 122a. The bell mouth portion 122b has a shape that flows from the right side to the left side along the outer circumferential surface of the left wall portion 86a and does not obstruct the flow of air sucked into the motor housing portion 88 through the inner air intake opening 120. There is. An inner air intake opening 120 is defined by the bell mouth portion 122b. A waterproof groove portion 124 recessed from the outer peripheral surface of the left wall portion 86a is formed in the bell mouth portion 122b. Specifically, the waterproof groove portion 124 is recessed radially inward from the outer peripheral surface of the left wall portion 86a. The depth D1 of the waterproof groove portion 124 is constant over the entire circumference.

As shown in FIG. 13, the inner air intake opening 120 is provided to the left of the outer air intake opening 32a by a distance L1. The inner air intake opening 120 has a circular shape. Further, the inner air intake opening 120 is provided inside the outer air intake opening 32a. Here, "the inner air intake opening 120 is provided inside the outer air intake opening 32a" means that the air flowing into the chain saw 2 from the outside to the outer air intake opening 32a, the inner air intake opening 120 This means passing through in this order. As shown in FIG. 8, the inner air intake opening 120 is provided at a position farther from the motor 92 than the outer air intake opening 32a in the left-right direction. As shown in FIG. 13, the distance L2 in the vertical direction between the lower end of the uppermost outer air intake opening 32a and the upper end of the waterproof groove 124 is within 10 cm.

As shown in FIG. 6, a duct 130 is housed inside the main body housing 10. As shown in FIG. 12, the duct 130 includes a fan side end 132, a mounting unit side end 134 (see FIG. 14), and a flow path portion connecting the fan side end 132 and the mounting unit side end 134. 136. As shown in FIG. 8, the fan side end portion 132 is provided between the left surface of the left housing 24 and the left wall portion 86a of the inner housing 86. As shown in FIG. A fan-side opening 132a is formed at the fan-side end 132 of the duct 130. The fan-side opening 132a faces the inner air intake opening 120 of the inner housing 86. The opening area of the fan side opening 132a is in the range of 1/3 to 1/2 of the opening area of the inner air intake opening 120. As shown in FIG. 14, the attachment unit side end portion 134 of the duct 130 is attached to the lower right side of the attachment unit 66. As shown in FIG. 7, the mounting unit side end portion 134 is formed with a mounting unit side opening 134a.

As shown in FIG. 15, the battery pack 200 includes a battery housing 202. The battery housing 202 accommodates a plurality of battery cells C (see FIG. 7). The battery housing 202 includes a hook 204, a second front rail 206 provided at the front end of the battery housing 202, and a second rear rail 208 provided at the rear end of the battery housing 202. There is. The second front rail 206 and the second rear rail 208 have shapes corresponding to the first front rail 66a and the first rear rail 66b (see FIG. 4) of the chainsaw 2, respectively. The hook 204 includes an engaging portion 204a and a hook operating portion 204b. The hook 204 is urged 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 52 (see FIG. 4) of the chainsaw 2, the engaging portion 204a of the hook 204 enters the engaged portion 66e (see FIG. 7) of the attachment unit 66 of the chainsaw 2. Thus, the battery pack 200 is fixed to the battery IF section 52. When the hook operating section 204b is pushed in from this state, the engaging section 204a comes out of the engaged section 66e. In this state, the battery pack 200 can be slid with respect to the battery IF section 52, and the battery pack 200 can be removed from the battery IF section 52 (ie, the chainsaw 2).

A first battery vent hole 202a is formed in the lower right side of the battery housing 202. As shown in FIG. 7, when the battery pack 200 is attached to the chainsaw 2, the first battery ventilation hole 202a faces the inner exhaust hole 66c of the attachment unit 66. As shown in FIG. 15, a second battery ventilation hole 202b is formed on the left side of the front surface of the battery housing 202. When the battery pack 200 is attached to the chainsaw 2, the second battery ventilation hole 202b faces the IF side intake opening 54a (see FIG. 4) of the IF front surface 54 of the battery IF section 52.

Next, the flow of air when the motor 92 of the chainsaw 2 is driven will be explained. When the motor 92 in FIG. 8 is driven, the sprocket 106 and fan 110 rotate. In this embodiment, the fan disk portion 112, the blade portion 114, and the cover portion 116 of the fan 110 rotate integrally. When the fan 110 is driven, air outside the main body housing 10 passes through the outer intake opening 32a of the left housing 24 and the inner intake opening 120 of the inner housing 86, and is sucked into the motor housing section 88. be caught. As shown in FIG. 6, the air that has flowed into the motor housing section 88 passes around the motor cover 90. As a result, the motor 92 inside the motor cover 90 is cooled. Furthermore, the control unit 80 defining the motor housing 88 is also cooled by the air flowing through the motor housing 88 . The air in the motor housing part 88 is exhausted to the outside from the front exhaust opening 88a on the front surface of the motor housing part 88.

Furthermore, when the fan 110 is driven, air within the battery housing section 18 is sucked into the motor housing section 88 via the duct 130. Specifically, as shown in FIG. 7, the air inside the battery accommodating section 18 flows through the second battery vent 202b of the battery pack 200 (see FIG. 15), the first battery vent 202a of the battery pack 200, and the mounting unit. 66, the outer exhaust hole 66d of the mounting unit 66, and the mounting unit side opening 134a of the duct 130, and is sucked into the duct 130. As air flows through the battery pack 200, the plurality of battery cells C within the battery pack 200 are cooled. As shown in FIG. 8, the air that has flowed into the duct 130 passes through the fan-side opening 132a and the inner air intake opening 120 of the inner housing 86, and is sucked into the motor housing section 88. The air flow thereafter is the same as the air flow that entered from the outer intake opening 32a of the left housing 24.

As described above, when the battery cover 50 is closed, the inside of the battery housing section 18 is sealed. Therefore, if the motor 92 continues to be driven, the inside of the battery housing section 18 will be in a negative pressure state. In this case, as shown in FIG. 6, air inside the main body housing 10 is sucked into the battery housing section 18. Specifically, air inside the main body housing 10 passes through the intake pipe 64 and the IF side intake opening 54a of the IF front surface 54, and is sucked into the battery housing section 18.

Further, when the motor 92 continues to be driven further, the inside of the main body housing 10 also becomes a negative pressure state. In this case, air outside the main body housing 10 is sucked into the main body housing 10 through the rear intake opening 70 provided at the lower rear surface of the main body housing 10. The air that has passed through the rear intake opening 70 and entered the main body housing 10 flows to the front, passes through the intake pipe 64 and the IF intake opening 54a of the IF front face 54, and enters the battery housing section 18. Inflow. In this way, while the motor 92 is being driven, the motor 92, the control unit 80, and the plurality of battery cells C in the battery pack 200 are cooled.

In one or more embodiments, as shown in FIGS. 1, 8, and 13, chainsaw 2 (an example of a "work machine") includes a body 4 having a motor housing 88; It includes a saw chain 8 (an example of a "working part") that can be attached. The main body 4 includes a fan 110 housed in a motor housing 88 and a motor 92 that is housed in the motor housing 88 and drives the saw chain 8 and the fan 110. The motor housing part 88 is located on the left side of the motor 92 (an example of a "first side") in the axial direction A of the motor 92, and is located on the left side of the left wall part 86a (an example of a "wall part") that defines the motor housing part 88. (one example), and an inner air intake opening 120 (an example of a "first air intake opening") provided in the left wall portion 86a. The left wall portion 86a includes a diameter reducing portion 122a whose diameter decreases from the right side (an example of a “second side”) toward the left side in the axial direction A, and a bell provided at the left end of the diameter reducing portion 122a. The mouth portion 122b includes a bell mouth portion 122b defining an inner intake opening 120, and a waterproof groove portion 124 provided in the bell mouth portion 122b and recessed from the outer peripheral surface of the left wall portion 86a. There is. According to the above configuration, when water flows along the reduced diameter portion 122a of the left wall portion 86a of the motor housing portion 88, it enters the waterproof groove portion 124 before reaching the inner air intake opening portion 120. The water that has entered the waterproof groove 124 flows downward without reaching the inner intake opening 120. Therefore, the amount of water reaching the inner air intake opening 120 can be further reduced. Therefore, it is possible to further suppress water from entering the motor accommodating portion 88. The chainsaw 2 may be used in an environment where water may adhere to the main body 4, such as in a rainy place. Therefore, even if water adheres to the main body portion 4, it is necessary to prevent the water from entering the motor accommodating portion 88. According to the above configuration, it is possible to suppress water from entering the motor housing portion 88, which is useful.

In one or more embodiments, as shown in FIG. 8, the body 4 includes a body housing 10 that houses a motor housing 88. An outer intake opening 32a (an example of a "second intake opening") is provided on the outer peripheral surface of the main body housing 10. In the working state of the chainsaw 2 (the state shown in FIG. 2), the outer air intake opening 32a is located above the inner air intake opening 120, and in the axial direction A, the outer air intake opening 32a is located above the inner air intake opening 120. It is provided on the right side in the axial direction A. According to the above configuration, water adhering to the outer circumferential surface of the main body portion 4 flows into the outer air intake opening 32a. The water that has flowed into the outer intake opening 32a adheres to the left wall portion 86a of the motor accommodating portion 88. Water adhering to the left wall portion 86a of the motor accommodating portion 88 flows from the right side to the left side in the axial direction A. As the water flows from the right side to the left side, some of the water flows downward. Further, a portion of the water flowing from the second side to the first side through the left wall portion 86a of the motor housing portion 88 is dammed up by the waterproof groove portion 124. Therefore, water flowing in from the outer air intake opening 32a can be prevented from entering the motor accommodating portion 88.

(Second example)
A chainsaw 302 according to a second embodiment will be described with reference to FIG. 16. In the chainsaw 2 of the second embodiment, the structure of the left housing 324 is different from the structure of the left housing 24 (see FIG. 8) of the first embodiment. In the following, configurations that are common between the embodiments will be denoted by the same reference numerals, and a description thereof will be omitted.

The left housing 324 includes a plurality of outer air intake openings 332a, a plurality of left air intake openings 332b provided to the right of the outer air intake opening 332a, and an outer air intake opening 332a and a left air intake opening 332b. and a rightward extension 334 defining a connecting air passage. In this embodiment, the plurality of outer air intake openings 332a and the plurality of left air intake openings 332b are arranged in the front-rear direction. The plurality of outer air intake openings 332a and the plurality of left side air intake openings 332b are located above the inner air intake opening 120.

(Third example)
A chainsaw 402 according to a third embodiment will be described with reference to FIGS. 17 and 18. In the chainsaw 402 of the third embodiment, the structure of the left wall portion 486a of the inner housing 486 is different from the structure of the left wall portion 86a of the inner housing 86 of the first embodiment (see FIGS. 8 and 13).

As shown in FIG. 17, the left wall portion 486a of the inner housing 486 is provided with an inner air intake opening 420 and a waterproof portion 422. The waterproof portion 422 includes a reduced diameter portion 422a and a bell mouth portion 422b extending radially outward from the left end of the reduced diameter portion 422a. The diameter reducing portion 422a has an outer diameter and an inner diameter decreasing from the right side to the left side. The bell mouth portion 422b is provided at the left end of the reduced diameter portion 422a. An inner air intake opening 420 is defined by the bell mouth portion 422b. A waterproof groove portion 424 recessed from the outer peripheral surface of the left wall portion 486a is formed in the bell mouth portion 422b. Specifically, the waterproof groove portion 424 is recessed radially inward from the outer peripheral surface of the left wall portion 486a. The depth of the waterproof groove part 424 is the maximum depth D2 at the upper and lower parts of the waterproof groove part 424. Moreover, as shown in FIG. 18, the depth of the waterproof groove part 424 is the minimum depth D3 in the left part and the right part of the waterproof groove part 424. Depth D3 is smaller than depth D2. In this embodiment, the depth of the waterproof groove portion 424 varies along the circumferential direction. That is, the depth of the waterproof groove portion 424 is not constant over the entire circumference.

In one or more embodiments, the depth of the waterproof groove 424 varies circumferentially, as shown in FIGS. 17 and 18. When molding the left wall portion 486a including the reduced diameter portion 422a, the bell mouth portion 422b, and the waterproof groove portion 424, a manufacturing method may be considered in which the left wall portion 486a is molded using two molds. When two molds are used, if the depth of the waterproof groove portion 424 is made constant over the entire circumference, it becomes difficult to remove the mold. According to the above configuration, mold cutting can be facilitated. Therefore, it is possible to further suppress water from entering the motor accommodating portion 88, and it is also possible to easily form the wall portion including the reduced diameter portion 422a, the bell mouth portion 422b, and the waterproof groove portion 424.

In one or more embodiments, as shown in FIGS. 17 and 18, in the working state of the chainsaw 402, the depth of the waterproof groove 424 in the upper and lower parts is a maximum depth D2, and the depth in the left and right parts is a maximum depth D2. The depth of the waterproof groove portion 424 is the minimum depth D3. Of the water flowing down the left wall portion 486a, a relatively large amount of water reaches the upper part of the waterproof groove portion 424. According to the above configuration, the upper part of the waterproof groove part 424 has the deepest depth. Therefore, it is possible to prevent the water accumulated in the upper part of the waterproof groove part 424 from getting over the bell mouth part 422b. Therefore, it is possible to further suppress water from entering the motor accommodating portion 88.

(First Modification) The "working machine" is not limited to the chainsaw 2, but may be a pole saw, a blower, a lawn mower, a hedge trimmer, a high pressure washer, a sprayer, a lawn mower, a scarifier, a cultivator, etc.

(Second Modification) The chainsaw 2 may have a waterproof groove section on the right side of the waterproof section 122. The waterproof groove portion may be provided between the right end of the outer air intake opening 32a and the bell mouth portion 122b in the axial direction A.

(Third Modification) The waterproof groove portion 424 in FIG. 8 may have the maximum depth in a portion different from the upper and lower portions of the waterproof portion 122.

(Fourth Modification) The main body housing 10 may be provided with an inner air intake opening 120. In this modification, the left wall portion of the main body housing 10 is an example of a “wall portion”.

(Fifth Modification) The motor 92 may be a brushed DC motor, or may be another type of motor such as an AC motor.

2 : Chainsaw 4 : Main body 6 : Guide bar 8 : Saw chain 10 : Main body housing 12 : Front hand guard 14 : Front handle 14a : Left side fixing part 14b : Left grip part 14c : Upper grip part 14d : Right grip part 14e : Right side fixed part 16 : Sprocket cover 18 : Battery housing part 20 : Rear side handle 22 : Rear side hand guard 22a : First guard part 22b : Second guard part 24 : Left side housing 26 : Right side housing 30 : Front side intake part 32 : Conical truncated portion 32a: Outside intake opening 34: Flat plate portion 40: Power button 42: Trigger lever 44: Lock lever 50: Battery cover 52: Battery IF section 53: Seal member 54: IF front surface 54a: IF side intake opening 56 : IF right surface 56a : Right side opening 58 : IF rear surface 60 : IF left surface 62 : IF bottom surface 64 : Intake pipe 64a : First air path 64b : Second air path 64c : End part 66 : Mounting unit 66a : First front rail 66b: First rear rail 66c: Inner exhaust hole 66d: Outer exhaust hole 66e: Engaged portion 68: Equipment side terminal 70: Rear intake opening 72: Sponge 80: Control unit 82: Motor unit 84: Oil tank 86: Inner housing 86a: Left wall portion 88: Motor housing portion 88a: Front exhaust opening 90: Motor cover 90a: Waterproof member 92: Motor 94: Cover body portion 94a: Body side disc portion 94b: First cylindrical portion 94c : Second cylindrical part 94d : Fin 94e : Main body side opening 96 : Lid part 96a : Lid side disc part 96b : Lid side circular opening 100 : Stator 102 : Rotor 104 : Output shaft 105 : Worm gear 106 : Sprocket 107 : Brake drum 108 : Bush 110 : Fan 110a : Ventilation passage 110b : Fan exhaust opening 112 : Fan disk part 112a : Center opening 112b : Rib part 114 : Vane part 116 : Cover part 116a : Cover side intake opening 120 : Inner intake opening 122 : Waterproof part 122a : Reduced diameter part 122b : Bell mouth part 124 : Waterproof groove part 130 : Duct 132 : Fan side end 132a : Fan side opening 134 : Mounting unit side end 134a : Mounting unit side opening 136: Channel section 200: Battery pack 202: Battery housing 202a: First battery vent 202b: Second battery vent 204: Hook 204a: Engagement section 204b: Hook operation section 206: Second front rail 208: Second Rear rail 302 : Chainsaw 324 : Left housing 332a : Outer intake opening 332b : Left intake opening 334 : Right extension part 402 : Chainsaw 420 : Inner intake opening 422 : Waterproof part 422a : Reduced diameter part 422b : Bell mouth Part 424 : Waterproof groove part 486 : Inner housing 486a : Left wall part A : Axial direction BS : Battery housing space C : Battery cell S : Placement surface

Claims (5)

A working machine,
a main body having a motor housing;
A working part attached to the main body part,
The main body portion is
a fan housed in the motor housing section;
a motor that is accommodated in the motor accommodating section and drives the working section and the fan;
The motor accommodating part is
a wall portion located on a first side of the motor in the axial direction of the motor and defining the motor accommodating portion;
a first intake opening provided in the wall;
The wall portion is
a diameter-reducing portion that is a second side in the axial direction and decreases in diameter as it goes from the second side opposite to the first side in the axial direction;
a bell mouth portion provided at a first side end of the reduced diameter portion, the bell mouth portion defining the first intake opening;
a waterproof groove provided in the axial direction between the first side end of the reduced diameter part and the bell mouth part or in the bell mouth part and depressed from the outer peripheral surface of the wall part; A work machine equipped with . The working machine according to claim 1, wherein the depth of the waterproof groove portion varies along the circumferential direction. According to claim 2, in the working state of the working machine, the depth of the waterproof groove at the upper and lower parts is the maximum depth, and the depth of the waterproof groove at the left and right parts is the minimum depth. Work equipment described. The main body portion is
comprising a main body housing that accommodates the motor accommodating portion,
One or more second intake openings are provided on the outer peripheral surface of the main body housing,
In a working state of the working machine, at least one second intake opening of the one or more second intake openings is located above the first intake opening;
In the axial direction, the one or more second intake openings are provided on the second side in the axial direction rather than the first intake opening. Work equipment described in. The working machine according to any one of claims 1 to 4, wherein the working machine is a chainsaw.