Work Machine

Abstract

To provide a work machine suppressed in size while improving dust-proofness and water-proofness.SOLUTION: A work machine 1 is provided with a front side intake port 2f and a rear side intake port 2g on left and right both side surfaces of a battery housing 2c, respectively. On the left and right both side surfaces of the battery housing 2c, platy external members 30 covering opening portions of the front side intake port 2f and the rear side intake port 2g are detachably installed. On the left and right both sides of the battery housing 2c, a front side communicating portion 2d and a rear side communicating portion 2e are provided, respectively. The front side communicating portion 2d and the rear side communicating portion 2e have groove-shapes respectively, and communicate the front side intake port 2f and the rear side intake port 2g covered by the external member 30 to outside air.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] Patent Document 1 discloses an electric power tool in which a control board and an air intake are arranged in a battery attachment part below a handle part of a housing. Patent Document 2 discloses a water injection type electric power tool to which a cover part that covers a ventilation hole of a housing with a gap can be attached. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-285787 A [Patent Document 2] JP 2014-617 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration of Patent Document 1, there is a risk of dust and water entering through the intake port, and there is room for improvement in terms of dustproofness and waterproofness. In the configuration of Patent Document 2, the cover member covers the outer peripheral surface of the housing so as to wrap around the outside of the outer peripheral surface (the cover member covers the left and right sides and the rear of the outer peripheral surface), which causes a problem of an increase in the size of the tool.

[0005] An object of the present invention is to provide a work machine that has improved dustproofness and waterproofness while being reduced in size. [Means for solving the problem]

[0006] One aspect of the present invention is a work machine. A motor; a housing that accommodates the motor; a fan driven by the motor to draw in air outside the housing; the housing includes a motor housing in which the motor is housed, and a battery housing to which a battery pack can be detachably attached; The fan draws air from outside the battery housing into the housing through an air intake port provided in the battery housing and exhausts the air from an air exhaust port provided in the housing, the intake port is covered by an external member that is detachable from the battery housing; The battery housing is characterized in that a groove is formed in the battery housing, the groove serving as a communication portion that communicates between the intake port and outside air.

[0007] Another aspect of the present invention is a work machine. A motor; a housing that accommodates the motor; a fan driven by the motor to draw in air outside the housing; the housing includes a motor housing in which the motor is housed, and a battery housing to which a battery pack can be detachably attached; The fan draws air from outside the housing into the housing through a plurality of air intakes provided in the battery housing and exhausts the air from an exhaust port provided in the housing; Each of the plurality of air intakes is covered by an external member that is detachable from the battery housing. 、 The housing is a left and right split housing, and the plurality of air intakes are provided in each of the left and right split housings. The present invention is characterized in that: Another aspect of the present invention is a work machine. A motor; a housing that accommodates the motor; a fan driven by the motor to draw in air outside the housing; the housing includes a motor housing in which the motor is housed, and a battery housing to which a battery pack can be detachably attached; The fan draws air from outside the housing into the housing through a plurality of air intakes provided in the battery housing and exhausts the air from an exhaust port provided in the housing; each of the plurality of air intakes is covered by an external member that is detachable from the battery housing; The battery housing is characterized in that a groove is formed in the battery housing, the groove serving as a communication portion that communicates between the intake port and outside air. Another aspect of the present invention is a work machine. A motor; a housing that accommodates the motor; a fan driven by the motor to draw in air outside the housing; the housing includes a motor housing in which the motor is housed, and a battery housing to which a battery pack can be detachably attached; The fan draws air from outside the housing into the housing through a plurality of air intakes provided in the battery housing and exhausts the air from an exhaust port provided in the housing; each of the plurality of air intakes is covered by an external member that is detachable from the battery housing; The external member is characterized in that it is larger than the air intake port and has a plate shape that does not allow air to pass through.

[0008] Any combination of the above components and conversion of the present invention between methods, systems, etc. are also valid aspects of the present invention. Effect of the Invention

[0009] According to the present invention, it is possible to provide a work machine that has improved dustproofness and waterproofness while being reduced in size. [Brief description of the drawings]

[0010] [Figure 1] 1 is a right side view of a working machine 1 according to an embodiment of the present invention. [Diagram 2] Cross-sectional view taken along line II-II in FIG. [Diagram 3] 2 is an enlarged right side view of the battery housing 2c of the work machine 1 and its vicinity. FIG. [Figure 4] FIG. 4 is a diagram showing a state in which the external member 30 is removed from FIG. [Diagram 5] 3A is a cross-sectional view taken along line A1-A1 in FIG. 3; and FIG. 4B is a cross-sectional view taken along line A2-A2 in FIG. [Figure 6] 3A is a cross-sectional view taken along line B1-B1 of FIG. 3. FIG. 4B is a cross-sectional view taken along line B2-B2 of FIG. [Figure 7] 3A is a cross-sectional view taken along line C1-C1 in FIG. 3. FIG. 4B is a cross-sectional view taken along line C2-C2 in FIG. [Figure 8] 3A is a cross-sectional view taken along line D1-D1 in FIG. 3; and FIG. 4B is a cross-sectional view taken along line D2-D2 in FIG. [Figure 9] 1A is an enlarged rear perspective view of the battery housing 2c and its vicinity, and FIG. 1B is an enlarged rear perspective view of the battery housing 2c and its vicinity with the external member 30 removed. [Figure 10]1A is an enlarged rear view of the battery housing 2c and its vicinity, and FIG. 1B is an enlarged rear view of the battery housing 2c and its vicinity with the external member 30 removed. [Figure 11] 1A is an enlarged front perspective view of the battery housing 2c and its vicinity, and FIG. 1B is an enlarged front perspective view of the battery housing 2c and its vicinity with the external member 30 removed. [Figure 12] FIG. 2 is a plan view of the working machine 1, showing the flow of cooling air. [Figure 13] FIG. 2 is a right side view of the working machine 1, showing the flow of cooling air. [Figure 14] 13 is a right sectional view (sectional view taken along the line AA in FIG. 12) of the working machine 1, along with the flow of cooling air. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] In the following, the same or equivalent components, members, etc. shown in each drawing are given the same reference numerals, and duplicated explanations are omitted as appropriate. The embodiments are illustrative and do not limit the invention. All features and combinations thereof described in the embodiments are not necessarily essential to the invention.

[0012] 1 to 14 relate to a work machine 1 according to an embodiment of the present invention. Fig. 1 defines the front-rear and up-down directions of the work machine 1 which are perpendicular to each other. The direction perpendicular to the front-rear and up-down directions is defined as the left-right direction. The work machine 1 is a driver drill. The work machine 1 includes a housing 2. The housing 2 includes a motor housing (body portion) 2a, a handle housing (handle portion) 2b, and a battery housing (battery attachment / detachment portion) 2c.

[0013] The motor housing 2a, the handle housing 2b, and the battery housing 2c are resin molded bodies divided into left and right halves. The housing 2 has an elastomer (elastic body) 35 that covers at least a part of the surface of the resin molded body. The elastomer 35 has a convex shape around the upper periphery of the external member 30 (described later) that is attached to the battery housing 2c, and also functions as an attachment guide for the external member 30.

[0014] The motor housing 2a is a cylindrical part whose central axis is approximately parallel to the front-rear direction. The motor housing 2a accommodates the motor 3, the reduction gear mechanism 4, etc., as shown in FIG. 14. A clutch dial 10, a sleeve portion 11, and a chuck portion 23 are provided in front of the motor housing 2a. The chuck portion 23 holds a tool tip such as a bit (not shown). The rotation of the motor 3 is reduced in speed by the reduction gear mechanism 4 and transmitted to the chuck portion 23. The motor 3 is a brushless motor. The supply of electricity to the motor 3 is controlled by a controller (microcomputer) and a switching element (inverter circuit) provided on a control board 20 shown in FIG. 14.

[0015] An intake port 2j is provided on each of the left and right side surfaces of the motor housing 2a. The housing 2 has a tail cover 12 that covers the rear end opening of the motor housing 2a. The tail cover 12 is made of a single resin molded body. An exhaust port 12a is provided on each of the left and right side portions of the tail cover 12. The exhaust port 12a may be a partial gap between the tail cover 12 and the motor housing 2a. The work machine 1 has a fan 17 inside the tail cover 12. The fan 17 is a centrifugal fan driven by the motor 3, and generates cooling air to cool the motor 3, the control board 20, etc.

[0016] The handle housing 2b has one end (upper end) connected to the middle part of the motor housing 2a in the front-rear direction and extends downward from the middle part. A trigger switch (operation switch) 6 that allows the user to switch between driving and stopping the motor 3 is provided at the upper end of the handle housing 2b.

[0017] The battery housing 2c is provided at the other end (lower end) of the handle housing 2b, and the battery pack 7 can be detachably attached thereto. The work machine 1 operates using power from the battery pack 7. As shown in Figs. 4, 9, 11, etc., a front air intake 2f and a rear air intake 2g are provided on both the left and right side surfaces (one and the other of the left and right two-part structure), respectively. The left and right front air intake 2f and rear air intake 2g are shaped to be plane-symmetrical to each other. The opening shape of the front air intake 2f and rear air intake 2g is a rectangle that is long in the front-rear direction. The vertical width of the front air intake 2f and rear air intake 2g is 1 mm or more.

[0018] As shown in Fig. 8, the rear air intake 2g includes a first portion 2h extending parallel to the left-right direction and a second portion 2i extending obliquely downward as it approaches the inside of the battery housing 2c. The first portion 2h and the second portion 2i are connected in order from the outside of the battery housing 2c. The front air intake 2f has a similar configuration.

[0019] A plate-shaped external member 30 is detachably attached to both the left and right side surfaces of the battery housing 2c. The external member 30 is attached by, for example, screwing, hooking, gluing, or any combination thereof. The external member 30 has an area larger than the openings of the front air intake 2f and the rear air intake 2g, and faces the openings of the front air intake 2f and the rear air intake 2g to cover the openings. The external member 30 may be in contact with the surface surrounding the openings. The left and right external members 30 are shaped to be plane-symmetrical to each other. The external member 30 is shaped so as not to protrude from the side surface of the battery housing 2c. The material of the external member 30 is impermeable to airflow, and is, for example, a magnetic material, a metal, a resin, a synthetic resin, or carbon. The periphery of the external member 30 is covered (surrounded) by an elastomer 35.

[0020] A front-side communicating portion 2d and a rear-side communicating portion 2e are provided on both the left and right side surfaces of the battery housing 2c. The left and right front-side communicating portions 2d and the rear-side communicating portions 2e are symmetrical to each other. The front-side communicating portion 2d and the rear-side communicating portion 2e are groove-shaped, and are connected to the front-side intake port 2f and the rear-side intake port 2g, respectively, to communicate the front-side intake port 2f and the rear-side intake port 2g covered by the external member 30 with the outside air. The front-side communicating portion 2d and the rear-side communicating portion 2e function as air passage guides that guide the cooling air to the front-side intake port 2f and the rear-side intake port 2g covered by the external member 30. The external member 30, the front-side communicating portion 2d and the rear-side communicating portion 2e, and the front-side intake port 2f and the rear-side intake port 2g form a labyrinth structure. The front communicating portion 2d extends obliquely downward as it goes forward. The rear communicating portion 2e extends parallel to the front-rear direction. The elastomer 35 is partially cut out at the front and rear of the external member 30 to form the front communicating portion 2d and the rear communicating portion 2e.

[0021] As shown in Fig. 2 and Fig. 14, the work machine 1 has a control board 20 that controls the motor 3 and a board holder (board case) 21 that houses and holds the control board 20 inside the battery housing 2c. The control board 20 or the board holder 21 is located at the same height as the front air intake 2f and the rear air intake 2g. Since the front air intake 2f and the rear air intake 2g have the second portion 2i as a guide portion, the cooling air taken in from the front air intake 2f and the rear air intake 2g to the battery housing 2c is guided to the underside of the board holder 21. The board holder 21 is made of metal (metal case) here as an example from the viewpoint of heat dissipation.

[0022] As shown in Figures 12 to 14, as the fan 17 rotates, air outside the housing 2 is taken in (sucked in) into the motor housing 2a through the air intake 2j on the side of the motor housing 2a, flows rearward while cooling the motor 3, is sucked into the fan 17, flows in the centrifugal direction, and is exhausted (discharged) from the exhaust port 12a.

[0023] As the fan 17 rotates, air outside the housing 2 is guided through the front communication portion 2d and the rear communication portion 2e from the front and rear of the external member 30 into the front air intake port 2f and the rear air intake port 2g, flows along the front air intake port 2f and the rear air intake port 2g and is taken in (sucked in) into the battery housing 2c, is guided below the board holder 21, flows forward along the underside of the board holder 21, flows upward through the handle housing 2b, flows rearward while cooling the motor 3, is sucked into the fan 17 and flows in a centrifugal direction, and is exhausted (discharged) from the exhaust port 12a.

[0024] According to this embodiment, the following effects can be obtained.

[0025] (1) Since the openings of the front air intake 2f and the rear air intake 2g provided on the side surface of the battery housing 2c are covered with the external member 30, it is possible to prevent water, dust, foreign objects, etc. from entering the battery housing 2c through the front air intake 2f and the rear air intake 2g, thereby improving dustproofness and waterproofness, compared to a case in which they are not covered with the external member 30 (a configuration in which the openings of the front air intake 2f and the rear air intake 2g are exposed to the outside).

[0026] (2) Since the groove-shaped front communicating portion 2d and rear communicating portion 2e are configured to guide the cooling air to the front air intake 2f and rear air intake 2g covered by the external member 30, a larger flow rate of the cooling air can be ensured and the cooling air is less likely to become clogged with dust, etc., compared to a configuration in which the cooling air is sucked in from the gap between the external member 30 and the outer surface of the battery housing 2c.

[0027] (3) Since the external member 30 does not protrude from the left or right side surface of the battery housing 2c (fits inside the outermost surface of the battery housing 2c in the left-right direction), the effect of increasing size due to the attachment of the external member 30 can be suppressed.

[0028] (4) The external member 30 can be made into a part with additional functions, thereby increasing convenience, by using it as a color plate to enhance design and identification, or as a plate in combination with a magnet to attract and hold bits or screws, or by displaying a scale that can be used to measure the length and diameter of screws or metal fittings.

[0029] (5) The front air intake 2f and the rear air intake 2g are within the height range of the substrate holder 21, have the second portion 2i, and are configured to guide cooling air below the underside of the metallic substrate holder 21, thereby improving the cooling of the substrate holder 21 and the control substrate 20. That is, because the upper opening of the substrate holder 21 is covered with urethane, the cooling effect is low even if cooling air is directed above the substrate holder 21, but the cooling effect is improved by directing the cooling air to the underside of the substrate holder 21.

[0030] (6) The front air intake 2f and the rear air intake 2g are provided on the left and right side surfaces of the battery housing 2c, so the reduction in strength caused by providing the air intakes can be reduced compared to when the air intakes are provided on the rear surface of the battery housing 2c.

[0031] (7) The front communication part 2d on the front side in the working direction extends obliquely downward as it goes forward and faces obliquely downward, so that dust and the like generated from the working part can be prevented from entering the front communication part 2d. The rear communication part 2e faces the opposite side to the working direction, so that dust and the like generated from the working part can be prevented from entering the rear communication part 2e.

[0032] Although the present invention has been described above using the embodiment as an example, it will be understood by those skilled in the art that various modifications are possible to the components and processes of the embodiment within the scope of the claims. Modifications will be mentioned below.

[0033] In the work machine 1, the front air intake 2f and the rear air intake 2g may be provided on only one of the left and right sides of the battery housing 2c. One of the front air intake 2f and the rear air intake 2g may be omitted. The tail cover 12 may have a left and right two-part structure and be integrated with the motor housing 2a. The motor 3 may be a brushed motor. The work machine 1 may be of a type other than a drill driver (such as an impact driver). [Explanation of symbols]

[0034] Reference Signs List 1...work machine, 2...housing, 2a...motor housing (body section), 2b...handle housing (handle section), 2c...battery housing (battery attachment / detachment section), 2d...front communication section, 2e...rear communication section, 2f...front intake port, 2g...rear intake port, 2h...first section, 2i...second section, 2j...intake port, 3...motor, 4...reduction mechanism, 6...trigger switch, 7...battery pack, 10...clutch dial, 11...sleeve, 12...tail cover, 12a...exhaust port, 17...fan, 20...control board, 21...board holder (board case), 23...chuck section, 30...external member, 35...elastomer (elastic body).

Claims

1. A motor; a housing that accommodates the motor; a fan driven by the motor to draw in air outside the housing; the housing includes a motor housing in which the motor is housed, and a battery housing to which a battery pack can be detachably attached; The fan draws air from outside the battery housing into the housing through an air intake port provided in the battery housing and exhausts the air from an air exhaust port provided in the housing, the intake port is covered by an external member that is detachable from the battery housing; A working machine, characterized in that a groove is formed in the battery housing, the groove serving as a communication portion that communicates between the intake port and outside air.

2. 2. The work machine according to claim 1, wherein the external member does not protrude from the housing when the external member is attached.

3. 3. The work machine according to claim 2, wherein the external member is covered with an elastomer when the external member is in an attached state.

4. 4. The work machine according to claim 3, wherein a cutout portion is provided in a part of the elastomer, the cutout portion communicating with the communication portion or forming the communication portion.

5. 5. The work machine according to claim 1, wherein the external member and the battery housing form a labyrinth structure.

6. The work machine according to any one of claims 1 to 5, characterized in that the battery housing accommodates a control board that controls the motor, and the control board or a holder that holds the control board and the air intake are located at the same height.

7. The work machine according to claim 6, characterized in that the air drawn in through the air intake port moves within the housing along a guide portion that guides the air toward the control board or an underside of a metal holder that holds the control board.

8. 8. The work machine according to claim 7, wherein the guide portion is an inclined surface provided on the battery housing.

9. A motor, a housing that accommodates the motor; a fan driven by the motor to draw in air outside the housing; the housing includes a motor housing in which the motor is housed, and a battery housing to which a battery pack can be detachably attached; The fan draws air from outside the housing into the housing through a plurality of air intakes provided in the battery housing and exhausts the air from an exhaust port provided in the housing; each of the plurality of air intakes is covered by an external member that is detachable from the battery housing; The housing is a left and right split housing, and the plurality of air intakes are provided in each of the left and right split housings.

10. A motor, a housing that accommodates the motor; a fan driven by the motor to draw in air outside the housing; the housing includes a motor housing in which the motor is housed, and a battery housing to which a battery pack can be detachably attached; The fan draws air from outside the housing into the housing through a plurality of air intakes provided in the battery housing and exhausts the air from an exhaust port provided in the housing; each of the plurality of air intakes is covered by an external member that is detachable from the battery housing; A groove that serves as a communication portion that communicates between the intake port and outside air is formed in the battery housing.

11. The work machine according to claim 1 , wherein the communication portion includes a communication portion facing in a working direction and obliquely downward, or a communication portion facing a side opposite to the working direction.

12. The work machine according to claim 1 , wherein the housing includes a handle housing having one end connected to a middle portion of the motor housing, and the battery housing is provided at the other end of the handle housing.

13. The work machine according to claim 1 , wherein the external member is in the form of a plate that is larger than the air intake port and does not allow air to pass through.

14. The work machine according to claim 13, wherein the opening of the intake port has a width of 1 mm or more.

15. A motor, a housing that accommodates the motor; a fan driven by the motor to draw in air outside the housing; the housing includes a motor housing in which the motor is housed, and a battery housing to which a battery pack can be detachably attached; The fan draws air from outside the housing into the housing through a plurality of air intakes provided in the battery housing and exhausts the air from an exhaust port provided in the housing; each of the plurality of air intakes is covered by an external member that is detachable from the battery housing; The external member is a plate-like member that is larger than the air intake port and does not allow air to pass through.

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