Work machine

Abstract

The present invention achieves a work machine in which good dust collection performance is maintained over a long time period. A hammer drill 2 comprises a motor 20, a fan 41 driven by the motor 20, and a housing 10 for accommodating the motor 20 and the fan 41. The housing 10 has a dust collection port 14, a passage R1 for air flowing from the dust collection port 14 to the fan 41, a passage for air flowing from the fan 41 to the dust collection port 14, and a closing part 60 which can switch between a first state of opening the passage R1 and a second state of closing the passage R1.

Description

Work equipment

[0001] The present invention relates to a work machine, and more particularly to a work machine having a dust collection function.

[0002] There are known working machines equipped with a function (dust collection function) for collecting dust generated during work. For example, Patent Document 1 describes a drilling tool equipped with a dust collection function. A drilling tool is an example of a working machine, and is suitable for drilling work. A drilling tool is also sometimes called an "impact tool" or a "hammer drill."

[0003] The drilling tool described in Patent Document 1 has a cooling fan and a dust collection fan. When the dust collection fan rotates, it sucks in dust-mixed air. The sucked in dust-mixed air is separated into air and dust. The dust separated from the air is then collected, and the air from which the dust has been removed is exhausted. In other words, when the dust collection fan rotates, an airflow (dust collection wind) for collecting the dust is generated.

[0004] When the cooling fan rotates, it draws in air. The air is then exhausted after removing heat from the motor, etc. In other words, when the cooling fan rotates, it generates an airflow (cooling air) to cool the heat-generating parts such as the motor.

[0005] Japanese Patent Application Laid-Open No. 2010-201526

[0006] Work machines equipped with dust collection functions are required to achieve and maintain good dust collection performance.

[0007] An object of the present invention is to realize a work machine that maintains good dust collection performance for a long period of time.

[0008] According to one embodiment, a work machine includes a drive unit, a fan driven by the drive unit, and a housing that accommodates the drive unit and the fan. The housing has a first air intake port, a first air intake path that serves as a path for air flowing from the first air intake port to the fan, a first exhaust path that serves as a path for air flowing from the fan to the first air intake port, and a closing portion that is switchable between a first state that opens the first air intake path and a second state that closes the first air intake path.

[0009] According to the present invention, a work machine is realized that maintains good dust collection performance for a long period of time.

[0010] 17 is a perspective view of a work machine system. FIG. 18 is a cross-sectional view of a work machine system. FIG. 19 is a perspective view of a hammer drill. FIG. 20 is a front view of a hammer drill. FIG. 21 is a perspective view of a dust collecting device. FIG. 22 is a rear view of the dust collecting device. FIG. 23 is a cross-sectional view of the dust collecting device. FIG. 24 is an exploded perspective view of a blower mechanism. FIG. 25 is a partially enlarged cross-sectional view showing the blower mechanism and its vicinity when a connection nozzle is inserted into a dust collecting port. FIG. 26 is a partially enlarged cross-sectional view showing the blower mechanism and its vicinity when a connection nozzle is not inserted into the dust collecting port. FIG. 27 is a partially enlarged perspective view showing a closing section just before the dust collecting device is attached to the hammer drill. FIG. 28 is a partially enlarged perspective view showing the closing section after the dust collecting device has been attached to the hammer drill. FIG. 29 is an explanatory view showing the process of attaching the dust collecting device to the hammer drill. FIG. 29 is a plan view of a regulating section. FIG. 29 is a plan view of a work machine system. FIG. 20 is a perspective view showing a modified example of a hammer drill 2. FIG. 21 is a perspective view showing a modified example of a dust collecting device 3. FIG. 29 is an explanatory view showing the process of attaching the dust collecting device shown in FIG. 17 to the hammer drill shown in FIG. 16.

[0011] An example of an embodiment of the present invention will be described in detail below with reference to the drawings. The work machine according to this embodiment is a hammer drill suitable for drilling work, etc. In all drawings referred to in describing the embodiment of the present invention, the same reference numerals are used for identical or substantially identical configurations and elements. Furthermore, as a general rule, configurations and elements that have already been described will not be described again.

[0012] <Overview of Hammer Drill> Fig. 1 is a perspective view of a work machine system 1 including a hammer drill 2 and an auxiliary device 3 attached to the hammer drill 2. Fig. 2 is a cross-sectional view of the work machine system 1 shown in Fig. 1. The auxiliary device 3 shown in Figs. 1 and 2 is detachable from the hammer drill 2.

[0013] The hammer drill 2 is composed of a housing 10, a motor 20, a power transmission mechanism 30, a blower mechanism 40, etc., and has a tool bit T attached thereto. More specifically, the base end (root side) of the tool bit T is fixed to the hammer drill 2. The hammer drill 2 drives the tool bit T with the driving force of the motor 20 to perform various operations such as drilling. In other words, the motor 20 is an example of a drive unit and is the drive source for the tool bit T.

[0014] The hammer drill 2 also drives the blower mechanism 40 by the driving force of the motor 20 to generate an airflow (dust-collecting airflow) for collecting dust generated during work. More specifically, when the blower mechanism 40 is activated, dust-containing air is sucked into the auxiliary device 3, thereby preventing or suppressing the scattering of dust into the surrounding area.

[0015] The auxiliary device 3 separates dust-containing air into air and dust and collects the dust. The air from which the dust has been removed by the auxiliary device 3 flows into the hammer drill 2. In other words, the motor 20 also serves as a drive source for the blower mechanism 40. The auxiliary device 3 also functions as a dust collector for collecting dust generated during work.

[0016] Furthermore, the air blowing mechanism 40 driven by the motor 20 generates an air current (cooling air) for cooling heat-generating parts such as the motor 20. More specifically, when the air blowing mechanism 40 is activated, air is drawn into the hammer drill 2. The air drawn into the hammer drill 2 passes around and through the heat-generating parts, cooling them.

[0017] In the following description, the axial direction of the tool bit T shown in Figure 2 will be referred to as the "front-rear direction." Furthermore, the tip end side of the tool bit T will be referred to as the "front," and the base end side of the tool bit T will be referred to as the "rear." Furthermore, the auxiliary device 3 will be referred to as the "dust collection device 3."

[0018] The hammer drill 2 has a plurality of operation modes including a "drill mode," a "hammer mode," and a "hammer drill mode." When the drill mode is selected, a rotational force is applied to the tool tip T. When the hammer mode is selected, an impact force is applied to the tool tip T. When the hammer drill mode is selected, a rotational force and an impact force are applied to the tool tip T.

[0019] A drill bit is an example of the tool tip T that can be attached to the hammer drill 2. The drill bit is used, for example, to drill holes in concrete, stone, etc. However, the tool tip T that can be attached to the hammer drill 2 is not limited to a drill bit. The tool tip T that can be attached to the hammer drill 2 is selected depending on the object to be worked on, the content of the work, etc.

[0020] <Housing> The housing 10 forms the outer shell of the hammer drill 2. The housing 10 can be broadly divided into a first housing 11 that forms the front part of the outer shell, a second housing 12 that forms the middle part of the outer shell, and a third housing 13 that forms the rear part of the outer shell.

[0021] In the following description, the first housing 11 may be referred to as the "gear case 11," the second housing 12 as the "main body housing 12," and the third housing 13 as the "handle housing 13."

[0022] The gear case 11 extends forward from the main body housing 12. Meanwhile, the handle housing 13 extends rearward from the main body housing 12. Furthermore, the rear of the gear case 11 is connected to the upper part of the main body housing 12. Meanwhile, the upper part of the handle housing 13 is connected to the upper part of the main body housing 12, and the lower part of the handle housing 13 is connected to the lower part of the main body housing 12.

[0023] The handle housing 13 and the main body housing 12 are connected via an elastic body such as rubber or a spring. From another perspective, the handle housing 13 forms an anti-vibration handle 13a that suppresses the transmission of vibrations from the main body housing 12.

[0024] The hammer drill 2 of this embodiment is equipped with a sub-handle 13b that extends in a direction perpendicular to the vibration-proof handle 13a. In the following description, the direction in which the sub-handle 13b extends is referred to as the "left-right direction."

[0025] <Air Intake Port, Air Outlet Port> Figure 3 is a perspective view of the hammer drill 2, and Figure 4 is a front view of the hammer drill 2. An air intake port 14 is provided in the upper part of the front wall of the main body housing 12. The air intake port 14 penetrates the front wall of the main body housing 12 and communicates with the inside and outside of the main body housing 12. From another perspective, the front wall of the main body housing 12 is an intake surface on which the air intake port 14 is formed. Therefore, in the following description, the front wall of the main body housing 12 may be referred to as the "air intake surface 12a."

[0026] A plurality of air intake ports 15 are provided in the lower portions of both side walls of the main housing 12. A plurality of air intake ports 16 (FIG. 2) are also provided in the bottom wall of the main housing 12. More specifically, three air intake ports 15 are provided in the lower portion of each side wall of the main housing 12. Ten air intake ports 16 are also provided in the bottom wall of the main housing 12.

[0027] Furthermore, a plurality of exhaust ports 17 are provided in the upper part of the main body housing 12. More specifically, five exhaust ports 17 are provided in the upper part of the main body housing 12.

[0028] Air intake 14 corresponds to the first air intake of the present invention. Air intake 15 and air intake 16 correspond to the second air intake of the present invention. In the following description, air intake 14 may be referred to as the "dust collection port 14." Air intake 15 may be referred to as the "side air intake 15," and air intake 16 may be referred to as the "bottom air intake 16."

[0029] <Motor> Referring again to Figure 2, the motor 20 is a three-phase brushless motor and is housed in the main body housing 12. More specifically, the motor 20 is disposed above the controller 21 housed in the lower part of the main body housing 12, and is electrically connected to the controller 21.

[0030] The motor 20 includes an output shaft 22 that is perpendicular to the axial direction (front-rear direction) of the tool bit T. The output shaft 22 is rotatably supported, and a pinion gear 23 is provided at the tip thereof.

[0031] In the following description, the axial direction of the output shaft 22 is referred to as the "up-down direction." Furthermore, the tip side of the output shaft 22 where the pinion gear 23 is provided is referred to as the "upper side," and the side opposite the tip side is referred to as the "lower side."

[0032] The handle housing 13 is provided with a trigger 24 and a trigger switch 25. The trigger 24 protrudes forward from the top of the anti-vibration handle 13a. The trigger switch 25 is disposed inside the anti-vibration handle 13a and is electrically connected to the controller 21.

[0033] When the trigger 24 is operated, a signal is output from the trigger switch 25 and input to the controller 21. When the signal is input to the controller 21, power is supplied to the motor 20 from a battery pack 26 attached to the lower end of the handle housing 13.

[0034] <Power Transmission Mechanism> The power transmission mechanism 30 transmits the driving force of the motor 20 to the tool bit T. The power transmission mechanism 30 transmits a rotational driving force or a reciprocating driving force to the tool bit T according to the operation mode selected by the operator.

[0035] The power transmission mechanism 30 is comprised of an intermediate shaft 31 , a motion converter 32 , a cylinder 33 , a ring gear 34 , a retainer sleeve 35 , etc., and is housed in the gear case 11 .

[0036] The intermediate shaft 31 extends in a direction (front-rear direction) perpendicular to the output shaft 22 of the motor 20. A bevel gear that meshes with the pinion gear 23 provided on the output shaft 22 is provided at the rear end of the intermediate shaft 31.

[0037] The motion converting part 32 is provided on the intermediate shaft 31 and includes an inner ring, an outer ring, rolling elements, and a connecting rod. The inner ring is fixed to the intermediate shaft 31, and the outer ring is disposed around the inner ring. The rolling elements are interposed between the inner ring and the outer ring, and the connecting rod extends from the outer peripheral surface of the outer ring toward the outside in the radial direction of the outer ring.

[0038] Intersecting grooves are formed on the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring. Part of the rolling elements fits into the groove formed in the inner ring, and other parts of the rolling elements fit into the groove formed in the outer ring. As a result, the inner ring and the outer ring are connected via the rolling elements so as to be able to rotate relative to each other.

[0039] A clutch is provided on the intermediate shaft 31. The clutch can be switched between an engaged state in which power is transmitted from the intermediate shaft 31 to the motion converting unit 32 and a released state in which power is not transmitted from the intermediate shaft 31 to the motion converting unit 32. The clutch can move back and forth along the intermediate shaft 31.

[0040] When the clutch moves backward to a predetermined position (close to the inner wheel), the intermediate shaft 31 and the inner wheel are connected via the clutch, and power is transmitted to the inner wheel from the intermediate shaft 31. On the other hand, when the clutch moves forward to a predetermined position (moves away from the inner wheel), the connection between the intermediate shaft 31 and the inner wheel is released, and power transmission from the intermediate shaft 31 to the inner wheel is interrupted.

[0041] The above-described clutch movement is achieved in response to an operator's operation to switch the operating mode. When the clutch is engaged, the rotation of the intermediate shaft 31 causes the inner ring to rotate. This causes the outer ring to roll along the surface of the inner ring. As a result, the connecting rod swings back and forth.

[0042] The cylinder 33 is provided above the intermediate shaft 31 and parallel to the intermediate shaft 31. The ring gear 34 is provided around the cylinder 33 and is movable back and forth along the cylinder 33. The ring gear 34 can be switched between a connected state in which the rotation of the intermediate shaft 31 is transmitted to the cylinder 33, and a disconnected state in which the rotation of the intermediate shaft 31 is not transmitted to the cylinder 33. The ring gear 34 is switched in response to an operation mode switching operation by an operator. In the disconnected state, the ring gear 34 rotates idly on the cylinder 33.

[0043] A piston, a striker, and an intermediate element are housed in the cylinder 33. The piston, striker, and intermediate element are aligned in a line from rear to front in this order, and an air chamber is provided between the piston and the striker.

[0044] The retainer sleeve 35 is disposed coaxially with the cylinder 33 in front of the cylinder 33. The rear end of the retainer sleeve 35 is fixed non-rotatably to the front end of the cylinder 33. The base end of the tool bit T is inserted into the retainer sleeve 35, and the retainer sleeve 35 holds the base end of the inserted tool bit T. In other words, the retainer sleeve 35 is an example of a tool attachment portion to which the tool bit T extending in the front-rear direction is attached.

[0045] A connecting rod of the motion conversion unit 32 is rotatably connected to the back surface of the piston, and when the connecting rod swings back and forth, the piston reciprocates back and forth within the cylinder 33, causing the pressure in the air chamber to fluctuate. The pressure fluctuation in the air chamber then drives the striker, which strikes the intermediate element, which strikes the tool bit T.

[0046] In this embodiment, when the drill mode is selected, the clutch is released and the ring gear is engaged. When the intermediate shaft 31 rotates in this state, the inner ring of the motion converter 32 does not rotate, but the cylinder 33 rotates. Therefore, only a rotational force is applied to the tool bit T held by the retainer sleeve 35.

[0047] On the other hand, when the hammer mode is selected, the clutch is engaged and the ring gear 34 is disengaged. When the intermediate shaft 31 rotates in this state, the inner ring of the motion conversion part 32 rotates, but the cylinder 33 does not rotate. This causes the piston to reciprocate within the stationary cylinder 33. As a result, only an impact force is applied to the tool bit T held by the retainer sleeve 35.

[0048] Furthermore, when the hammer drill mode is selected, the clutch is engaged and the ring gear 34 is engaged. When the intermediate shaft 31 rotates in this state, the inner ring of the motion converting part 32 rotates, and the cylinder 33 also rotates. As a result, the piston reciprocates within the rotating cylinder 33. As a result, both a rotational force and an impact force are applied to the tool bit T held by the retainer sleeve 35.

[0049] <Dust Collector> Fig. 5 is a perspective view of the dust collector 3. Fig. 6 is a rear view of the dust collector 3, and Fig. 7 is a cross-sectional view of the dust collector 3. The dust collector 3 is composed of a cover 50, a suction unit 51, a dust collecting unit 52, etc. As described above, the dust collector 3 is attached to the hammer drill 2 to collect dust. More specifically, the dust collector 3 is attached to the front of the main body housing 12 and partially overlaps with the gear case 11 (see Figs. 1 and 2). From another perspective, a portion of the dust collector 3 attached to the main body housing 12 is disposed below the gear case 11, and another portion of the dust collector 3 protrudes forward of the gear case 11.

[0050] The hammer drill 2 can be used alone. Therefore, if there is no need or desire to collect dust, there is no need to attach the dust collector 3 to the hammer drill 2.

[0051] <Cover> The cover 50 forms the outer shell of the dust collecting device 3. The cover 50 is composed of two cover members. The cover 50 is formed by butting the two cover members together. A part of the cover 50 forms a connecting portion 53 that is located behind the dust collecting portion 52 and is connected to the hammer drill 2.

[0052] The connecting portion 53 has a bottom wall portion 53a and a pair of side wall portions 53b, 53c rising upward from both sides of the bottom wall portion 53a. The connecting portion 53 is placed over the lower part of the main housing 12 and covers the lower part of the main housing 12. More specifically, the bottom wall portion 53a of the connecting portion 53 covers the bottom wall of the main housing 12 from below. At the same time, the side wall portions 53b, 53c of the connecting portion cover both side walls of the main housing 12 from the sides.

[0053] The side walls 53b, 53c of the connecting part 53 are provided with side openings 54. The bottom wall 53a of the connecting part 53 is provided with a bottom opening 55. Therefore, even if the lower part of the main housing 12 is covered by the connecting part 53, the flow of air into the main housing 12 from the side air intakes 15 and the bottom air intakes 16 is not impeded. The fixing structure (engagement structure) between the hammer drill 2 and the dust collector 3 will be described later.

[0054] <Suction part> The suction part 51 has a cylindrical shape extending in the front-rear direction. A suction nozzle 56 extending upward is provided at the tip of the suction part 51. The tip (upper end) of the suction nozzle 56 is formed in an annular shape. The tip of the tool bit T is inserted into the annular tip (upper end) of the suction nozzle 56.

[0055] 2 is activated, air around the tip of the tool bit T is sucked into the suction part 51 through the suction nozzle 56. At this time, if dust is floating around the tool bit T, the dust is also sucked into the suction part 51 together with the air. In other words, air mixed with dust is sucked into the suction part 51. The structure and operation of the blower mechanism 40 will be described later.

[0056] <Dust Collection Section> The suction section 51 is in communication with the dust collection section 52. Therefore, the dust-mixed air sucked into the suction section 51 flows into the dust collection section 52. The dust collection section 52 is provided with a cyclone section 57. The dust-mixed air that has flowed into the dust collection section 52 is separated into air and dust in the cyclone section 57. From another perspective, the dust in the air is centrifuged.

[0057] The air from which the dust has been removed flows into a filter chamber 58 provided behind the cyclone unit 57. A filter is installed inside the filter chamber 58. The air that has flowed into the filter chamber 58 passes through the filter and flows into the connecting nozzle 59. At this time, any dust that has not been removed by the cyclone unit 57 is captured by the filter.

[0058] The connection nozzle 59 has a cylindrical shape that extends in the front-rear direction and protrudes in the same direction as the connecting portion 53. When the dust collector 3 is attached to the hammer drill 2, the connection nozzle 59 is connected to the main housing 12. More specifically, the connection nozzle 59 is inserted into the dust collection port 14 of the main housing 12. As a result, the hammer drill 2 (main housing 12) and the dust collector 3 are in communication with each other via the connection nozzle 59.

[0059] <Blower Mechanism> Figure 8 is an exploded perspective view of the blower mechanism 40. The blower mechanism 40 is composed of a fan 41, a fan guide 42, etc. The fan 41 includes a pair of base plates 43a, a first fan 43b, and a second fan 43c. The first fan 43b is provided between the opposing base plates 43a. The second fan 43c is provided on the lower surface of the lower base plate 43a.

[0060] The fan guide 42 is disposed around the fan 41 and surrounds it. In other words, the fan 41 is housed in the fan guide 42. As shown in FIG. 2 , the blower mechanism 40 including the fan 41 and the fan guide 42 is disposed above the motor 20, and the output shaft 22 of the motor 20 passes through the fan 41 and the fan guide 42 and protrudes above the blower mechanism 40. Furthermore, the output shaft 22 of the motor 20 is fixed to the fan 41. Therefore, when the motor 20 is operated, the fan 41 rotates inside the fan guide 42. More specifically, a first fan 43b and a second fan 43c shown in FIG. 8 simultaneously rotate inside the fan guide 42.

[0061] The fan guide 42 includes a guide base 44 disposed above the fan 41. An inlet 44a communicating with the fan 41 is provided in the center of the guide base 44. From another perspective, the inlet 44a communicating with the fan 41 is provided in the ceiling of the fan guide 42 formed by the guide base 44.

[0062] The fan guide 42 includes a partition wall 45, a flow straightening plate 46, a guide wall 47, etc. in addition to the guide base 44. The partition wall 45 is provided on the upper surface of the guide base 44. Furthermore, a portion of the partition wall 45 surrounds a portion of the circumferential direction of the inlet 44a, and another portion of the partition wall 45 extends radially outward from the guide base 44. As a result, a passage R1 is formed on the guide base 44 that is separated from the surrounding area and communicates with the inlet 44a.

[0063] Fig. 9 is a partially enlarged cross-sectional view showing the blower mechanism 40 and its vicinity when the connection nozzle 59 is inserted into the dust collection port 14. Fig. 10 is a partially enlarged cross-sectional view showing the blower mechanism 40 and its vicinity when the connection nozzle 59 is not inserted into the dust collection port 14.

[0064] The passage R1 extends forward from the inlet 44a and faces the dust collection port 14. From another perspective, the passage R1 extends in a direction intersecting the intake surface 12a and connects the dust collection port 14 and the inlet 44a.

[0065] 9 , when the dust collector 3 is attached to the hammer drill 2, the connection nozzle 59 of the dust collector 3 is inserted into the dust collection port 14 of the main housing 12. The connection nozzle 59 inserted into the dust collection port 14 is then inserted inside the partition wall 45. From another perspective, the connection nozzle 59 of the dust collector 3 is inserted into the passage R1 through the dust collection port 14. In other words, the dust collector 3 attached to the hammer drill 2 is connected to the first fan 43b via the passage R1.

[0066] As a result, when the first fan 43b rotates while the dust collector 3 is attached to the hammer drill 2, dust-collecting air W1 is generated. More specifically, dust-containing air is sucked into the suction section 51 via the suction nozzle 56 of the dust collector 3. The dust-containing air sucked into the suction section 51 passes through the cyclone section 57 and the filter chamber 58, and then flows out from the connection nozzle 59 inserted into the dust collection port 14. The air flowing out from the connection nozzle 59 passes through the passage R1, flows into the fan guide 42 from the inlet 44a, and flows into the first fan 43b. The air flowing into the first fan 43b is blown out radially outward from the first fan 43b.

[0067] As described above, the passage R1 is at least a part of the passage for the dust collection airflow W1 that flows from the dust collection port 14 to the first fan 43b, and is connected to the inlet 44a of the fan guide 42. The first fan 43b is also connected to the dust collection port 14 via the passage R1. In other words, the passage R1 corresponds to the first air intake passage of the present invention, or at least a part of the first air intake passage. The first fan 43b is also a dust collection fan that generates the dust collection airflow W1.

[0068] As shown in FIG. 5 and other figures, the upper surface of the connection nozzle 59 is provided with two openings 59a for increasing the dust collecting airflow W1.

[0069] <Second Air Intake Path> When the second fan 43c rotates, air is drawn into the main body housing 12 through the side air intake 15 (FIG. 3) and the bottom air intake 16 (FIG. 2). The air drawn into the main body housing 12 passes through the motor 20 and the controller 21 (FIG. 2) to cool them. From another perspective, when the second fan 43c rotates, cooling air W2 is generated that cools heat-generating parts such as the motor 20.

[0070] More specifically, the air drawn into the main body housing 12 by the rotation of the second fan 43c passes over the surface of the controller 21 to cool the controller 21. The air drawn into the main body housing 12 by the rotation of the second fan 43c also passes through the gap between the stator and rotor of the motor 20 to cool the motor 20. The air that has passed through the motor 20 and the controller 21 is blown outward in the radial direction of the second fan 43c.

[0071] As described above, the space around the controller 21 and the gap between the stator and rotor of the motor 20 form at least a part of the passage R2 through which the cooling air W2 flows. From another perspective, the passage R2 is a passage for the cooling air W2 that flows from the side air intake port 15 and the bottom air intake port 16 to the second fan 43c. The second fan 43c is also connected to the side air intake port 15 and the bottom air intake port 16 via the passage R2. In other words, the passage R2 corresponds to the second air intake path of the present invention, or at least a part of the second air intake path. The second fan 43c is a cooling fan that generates the cooling air W2.

[0072] Most of the air (dust-collecting air W1, cooling air W2) blown out from the fan 41 is sent above the fan guide 42 by the rectifying plate 46. The dust-collecting air W1 and cooling air W2 sent above the fan guide 42 are exhausted to the outside of the housing 10 through the exhaust port 17.

[0073] <First exhaust path> The fan guide 42 is provided with an outlet 48. The outlet 48 is defined by a notch formed in the lower part of the guide wall 47, and is located radially outward of the second fan 43c (see FIG. 8).

[0074] As shown in Figure 3, the main housing 12 is provided with a closing section 60 that opens and closes the dust collection port 14 and the outlet 48. The closing section 60 will be described in detail later, but when the dust collecting device 3 is attached to the hammer drill 2, the closing section 60 closes the outlet 48 and opens the dust collection port 14 (Figure 9). On the other hand, when the dust collecting device 3 is detached from the hammer drill 2, the closing section 60 opens the outlet 48 and closes the dust collection port 14 (Figure 10).

[0075] 10 , when the second fan 43c rotates without the dust collector 3 attached to the hammer drill 2, part of the cooling air W2 flows out from the outlet 48 to the side of the fan guide 42. The cooling air W2 flowing out from the fan guide 42 flows upward through the gap between the guide wall 47 and the front wall (intake surface 12a) of the main housing 12, and flows out of the housing 10 through the gap between the dust collection port 14 and the closure portion 60.

[0076] 9, when the dust collector 3 is attached to the hammer drill 2, the cooling air W2 does not flow out from the outlet 48 to the side of the fan guide 42. From another perspective, the cooling air W2 does not flow out of the housing 10 through the gap between the guide wall 47 and the front wall (intake surface 12a) of the main housing 12.

[0077] As described above, the gap between the guide wall 47 and the front wall (intake surface 12a) of the main body housing 12 forms at least a part of the passage R3 for the cooling air W2 flowing from the second fan 43c to the dust collection port 14. From another perspective, the passage R3 is a passage for the cooling air W2 flowing from the second fan 43c to the dust collection port 14, and is connected to the outlet 48 of the fan guide 42. Furthermore, as shown in Figures 9 and 10, the passage R3 extends along the intake surface 12a between the outlet 48 and the dust collection port 14. In other words, the passage R3 corresponds to the first exhaust path of the present invention, or at least a part of the first exhaust path.

[0078] 3 and 4, the closing portion 60 is a plate-like member that fits along the intake surface 12a of the main housing 12. Fig. 11 is a partially enlarged perspective view showing the closing portion 60 immediately before the dust collecting device 3 is attached to the hammer drill 2. Fig. 12 is a partially enlarged perspective view showing the closing portion 60 after the dust collecting device 3 has been attached to the hammer drill 2.

[0079] The closing portion 60 is supported so as to be slidable up and down. The closing portion 60 is constantly biased upward by a biasing portion (coil spring 61). When the tapered tip of the connection nozzle 59 is pressed against the closing portion 60, the closing portion 60 is pushed down against the bias of the coil spring 61. As a result, as shown in FIG. 9 , the dust collection port 14 is opened, opening the passage R1, while the outlet 48 is closed. Furthermore, the connection nozzle 59 passes through the dust collection port 14 and enters the passage R1. From another perspective, when the dust collecting device 3 is attached to the hammer drill 2, the closing portion 60 is pushed down against the bias of the coil spring 61, opening the passage R1.

[0080] On the other hand, when the connection nozzle 59 is pulled out of the dust collection port 14, the closing portion 60 is pushed up by the urging force of the coil spring 61. Then, as shown in Figure 10, the dust collection port 14 is closed, and the passage R1 is closed, while the outlet 48 is opened. From another perspective, when the dust collector 3 is removed from the hammer drill 2, the passage R1 is automatically closed.

[0081] That is, the closing section 60 is switchable between a first state (FIG. 9) in which the passage R1 is opened and the passage R3 is closed, and a second state (FIG. 10) in which the passage R1 is closed and the passage R3 is opened.

[0082] When the closing part 60 is switched to the second state, part of the cooling air W2 flows out of the housing 10 through the gap between the dust collection port 14 and the closing part 60. Therefore, when the hammer drill 2 is used alone, dust does not accumulate in the gap between the dust collection port 14 and the closing part 60. As a result, the smooth opening and closing of the closing part 60 is not hindered by dust accumulated in the gap between the dust collection port 14 and the closing part 60.

[0083] 3 and 4 , the housing 10 of the hammer drill 2 is provided with a plurality of engaging portions 70 that engage with the dust collecting device 3 so as to be relatively movable. More specifically, the main body housing 12 is provided with a first engaging portion 71, a second engaging portion 72, a third engaging portion 73, and a fourth engaging portion 74.

[0084] Each engaging portion 70 is a groove recessed in the left-right direction and extending in the front-rear direction. In other words, each engaging portion 70 is a groove whose depth direction is the left-right direction and whose length direction is the front-rear direction. Therefore, in the following description, the engaging portion provided on the housing 10 of the hammer drill 2 may be referred to as an "engagement groove."

[0085] The first engagement groove 71 and the third engagement groove 73 are disposed at the same position in the vertical direction. The second engagement groove 72 and the fourth engagement groove 74 are disposed at the same position in the vertical direction. In other words, the first engagement groove 71 and the third engagement groove 73 are provided at the same height, and the second engagement groove 72 and the fourth engagement groove 74 are provided at the same height.

[0086] From another perspective, four engagement grooves 70 are arranged on the top, bottom, left, and right sides of the intake surface 12a on which the dust collection port 14 is provided. The dust collection port 14 is located between the first engagement groove 71 and the second engagement groove 72 in the up-down direction parallel to the intake surface 12a. The dust collection port 14 is also located between the first engagement groove 71 and the second engagement groove 72 in the left-right direction parallel to the intake surface 12a and perpendicular to the up-down direction.

[0087] Similarly, the dust collection port 14 is located between the third engagement groove 73 and the fourth engagement groove 74 in the vertical direction, and is also located between the third engagement groove 73 and the fourth engagement groove 74 in the horizontal direction.

[0088] 5 and 6, the dust collecting device 3 is provided with a plurality of engaging portions 80 that engage with the housing 10 of the hammer drill 2 so as to be relatively movable. More specifically, a first engaging portion 81, a second engaging portion 82, a third engaging portion 83, and a fourth engaging portion 84 are provided on the top, bottom, left, and right sides of the inside of the connecting portion 53.

[0089] Each engaging portion 80 is a protrusion that protrudes in the left-right direction and extends in the front-rear direction. In other words, each engaging portion 80 is a protrusion whose height direction is the left-right direction and whose length direction is the front-rear direction. Therefore, in the following description, the engaging portions provided on the dust collecting device 3 may be referred to as "engaging protrusions."

[0090] 13 is an explanatory diagram showing the process of attaching the dust collecting device 3 to the hammer drill 2. The dust collecting device 3 is attached to the hammer drill 2 from the front of the hammer drill 2. At this time, the connecting portion 53 of the dust collecting device 3 is placed over the lower part of the main housing 12. Furthermore, the engaging protrusion 80 provided on the connecting portion 53 is inserted into the engaging groove 70 provided in the main housing 12.

[0091] More specifically, the third engaging protrusion 83 shown in the figure is inserted parallel to the third engaging groove 73, and the second engaging protrusion 82 is inserted parallel to the second engaging groove 72. Furthermore, the first engaging protrusion 81 not shown is inserted parallel to the first engaging groove 71, and the fourth engaging protrusion 84 is inserted parallel to the fourth engaging groove 74.

[0092] The engagement protrusion 80 inserted into the engagement groove 70 moves rearward along the engagement groove 70 and enters the engagement groove 70 by a predetermined length. From another perspective, the engagement groove 70 with the engagement protrusion 80 inserted moves forward along the engagement protrusion 80 and receives the engagement protrusion 80 by a predetermined length. Note that the predetermined length is the same as or approximately the same as the overall length of the engagement groove 70 and the engagement protrusion 80.

[0093] On the other hand, when the dust collecting device 3 is removed from the hammer drill 2, the engaging protrusion 80 that was inserted into the engaging groove 70 moves forward along the engaging groove 70 and disengages from the engaging groove 70. From another perspective, the engaging groove 70 that received the engaging protrusion 80 moves rearward along the engaging protrusion 80, releasing the engaging protrusion 80. In other words, the engaging groove 70 provided in the housing 10 of the hammer drill 2 engages with the dust collecting device 3 so as to be relatively movable in the front-to-rear direction.

[0094] 5 and 7, the dust collecting device 3 includes a restricting portion 90. The restricting portion 90 restricts the relative movement of the engagement groove 70 of the hammer drill 2 with respect to the dust collecting device 3.

[0095] 14 is a plan view of the restricting portion 90. The restricting portion 90 has a plate portion 91, a claw portion 92, an operating portion 93, and a connecting portion 94. The plate portion 91 is formed in a strip shape extending in the front-to-rear direction. The claw portion 92 is provided at one longitudinal end (tip end) of the plate portion 91, and the connecting portion 94 is provided at the other longitudinal end (rear end) of the plate portion 91. The operating portion 93 is provided rearward of the longitudinal center of the plate portion 91. Furthermore, the operating portion 93 protrudes outward in the width direction of the plate portion 91. In other words, the operating portion 93 is offset.

[0096] 5 and 7 , the restricting portion 90 is provided on the upper portion of the dust collecting device 3 and extends parallel to the suction portion 51. Most of the restricting portion 90 is housed inside the cover 50 of the dust collecting device 3, but the claw portion 92 protrudes (is exposed) outside the cover 50.

[0097] The restricting portion 90 is rotatably (swingably) supported by a support shaft 95 inserted through the connecting portion 94. The restricting portion 90 is also biased upward by a coil spring 96 disposed below the plate portion 91.

[0098] 2 , when the dust collecting device 3 is attached to the hammer drill 2, the claw portion 92 of the restricting portion 90 engages with the hammer drill 2. More specifically, the claw portion 92 enters under the gear case 11 and fits into a recess 97 provided on the underside of the gear case 11. As a result, the engagement groove 70 provided in the hammer drill 2 is restricted from moving relative to the dust collecting device 3. From another perspective, the dust collecting device 3 is fixed to the hammer drill 2.

[0099] When the dust collecting device 3 is to be removed from the hammer drill 2, the engagement of the claw portion 92 with the hammer drill 2 is released. Specifically, the operating portion 93 (FIG. 5) is pressed to rotate the restricting portion 90 downward against the bias of the coil spring 96 (FIG. 7). This causes the claw portion 92 shown in FIG. 2 to be pushed down and removed from the recess 97. Thereafter, when the dust collecting device 3 is pulled forward, the hammer drill 2 and the dust collecting device 3 are separated. From another perspective, when the hammer drill 2 is pulled backward, the hammer drill 2 and the dust collecting device 3 are separated.

[0100] Figure 15 is a plan view of the work machine system 1. As described above, the operating portion 93 of the restricting portion 90 is offset. As a result, when the dust collecting device 3 is attached to the hammer drill 2, the operating portion 93 protrudes to the side of the tool bit T attached to the hammer drill 2. In other words, the operating portion 93 of the restricting portion 90 does not overlap with the tool bit T in the left-right direction. Although not shown in Figure 15, the claw portion 92 of the restricting portion 90 overlaps with the tool bit T in the left-right direction.

[0101] As described above, in this embodiment, the dust collecting device 3 is attached to the hammer drill 2 by cooperation of the engagement groove 70 and recess 97 provided on the hammer drill 2 and the engagement protrusion 80 and restriction portion 90 provided on the dust collecting device 3. In other words, the dust collecting device 3 can be attached to the hammer drill 2 without using bolts or other fixing means. Furthermore, even without using bolts or other fixing means, rattle of the dust collecting device 3 attached to the hammer drill 2 is prevented, and airtightness between the two is ensured. As a result, leakage of the dust collecting air W1 is prevented or suppressed, and good dust collecting performance is achieved.

[0102] Furthermore, the intake surface 12a on which the dust collection port 14 is formed faces in the front-rear direction, and the engagement grooves 70 and engagement protrusions 80 engage with each other so as to be relatively movable in the front-rear direction. Furthermore, the restricting portion 90 restricts the relative movement of the engagement grooves 70 and engagement protrusions 80 in the front-rear direction. As a result, the hammer drill 2 and the dust collector 3 are firmly pressed against each other in the front-rear direction perpendicular to the intake surface 12a, reliably ensuring airtightness between the dust collection port 14 and the connection nozzle 59. In particular, in this embodiment, the engagement grooves 70 and engagement protrusions 80 are disposed above, below, left, and right of the dust collection port 14, so that airtightness between the dust collection port 14 and the connection nozzle 59 is more reliably ensured.

[0103] The same effect can be obtained even if each engagement groove 70 is arranged so as to partially overlap with the dust collection port 14 in either the up, down, left, or right direction. Specifically, for example, the first engagement portion 71 shown in Fig. 4 may be extended to the right and arranged so that its position in the left-right direction overlaps with the dust collection port 14.

[0104] In addition, since the operating portion 93 of the restricting portion 90 is offset, the bit T does not get in the way when operating the operating portion 93. From another perspective, the dust collecting device 3 can be attached to and detached from the hammer drill 2 without removing the bit T from the hammer drill 2.

[0105] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, the number of engagement grooves 70 and engagement protrusions 80 can be increased or decreased as appropriate. For example, engagement grooves 70 and engagement protrusions 80 different in position or length from the engagement grooves 70 and engagement protrusions 80 described so far may be added.

[0106] Fig. 16 is a perspective view showing a modified example of the hammer drill 2. Fig. 17 is a perspective view showing a modified example of the dust collecting device 3.

[0107] The hammer drill 2 shown in Fig. 16 is additionally provided with a fifth engagement portion (fifth engagement groove) 75 and a sixth engagement portion (sixth engagement groove) 76. The dust collecting device 3 shown in Fig. 17 is additionally provided with a fifth engagement portion (fifth engagement protrusion) 85 and a sixth engagement portion (sixth engagement protrusion) 86. The fifth engagement protrusion 85 is inserted into the fifth engagement groove 75, and the sixth engagement protrusion 86 is inserted into the sixth engagement groove 76.

[0108] Here, the fifth engagement groove 75 and the sixth engagement groove 76 are provided at the same height and are provided above and in front of any of the first engagement groove 71 to the fourth engagement groove 74. In addition, the fifth engagement protrusion 85 and the sixth engagement protrusion 86 are provided at the same height and are provided above and in front of any of the first engagement protrusion 81 to the fourth engagement protrusion 84.

[0109] In other words, the fifth engagement protrusion 85 and the sixth engagement protrusion 86 are spaced forward from the first engagement protrusion 81 to the fourth engagement protrusion 84. The fifth engagement groove 75 and the sixth engagement groove 76 are spaced forward from the first engagement groove 71 to the fourth engagement groove 74. As a result, the engagement range can be expanded in the front-to-rear direction without increasing the engagement depth between the protrusions and grooves. From another perspective, rattle between the hammer drill 2 and the dust collector 3 can be suppressed without increasing resistance during insertion.

[0110] Furthermore, when the engagement groove 70 and the engagement protrusion 80 are engaged, the gaps that occur in the vertical direction between the second and fourth engagement protrusions 82 and 84 and the second and fourth engagement grooves 72 and 74 are larger than the gaps that occur in the vertical direction between the first and third engagement protrusions 81 and 83 and the first and third engagement grooves 71 and 73. Furthermore, when the engagement groove 70 and the engagement protrusion 80 are engaged, the gaps that occur in the vertical direction between the first and third engagement protrusions 81 and 83 and the first and third engagement grooves 71 and 73 are larger than the gaps that occur in the vertical direction between the fifth and sixth engagement protrusions 85 and 86 and the fifth and sixth engagement grooves 75 and 76.

[0111] Furthermore, the front-rear length of the first engaging protrusion 81 and the third engaging protrusion 83 is shorter than the front-rear length of the second engaging protrusion 82 and the fourth engaging protrusion 84, and the front-rear length of the fifth engaging protrusion 85 and the sixth engaging protrusion 86 is even shorter. Similarly, the front-rear length of the first engaging groove 71 and the third engaging groove 73 is shorter than the front-rear length of the second engaging groove 72 and the fourth engaging groove 74, and the front-rear length of the fifth engaging groove 75 and the sixth engaging groove 76 is even shorter.

[0112] 18 , when the hammer drill 2 and the dust collector 3 are moved closer to each other, the engagement protrusions 80 are inserted into the engagement grooves 70 in the following order: First, the second engagement protrusion 82 and the fourth engagement protrusion 84 are inserted into the second engagement groove 72 and the fourth engagement groove 74. Next, the first engagement protrusion 81 and the third engagement protrusion 83 are inserted into the first engagement groove 71 and the third engagement groove 73. Finally, the fifth engagement protrusion 85 and the sixth engagement protrusion 86 are inserted into the fifth engagement groove 75 and the sixth engagement groove 76.

[0113] As described above, since the engaging projections are inserted into the engaging grooves in order, it is easy to insert the engaging projections into the engaging grooves even though there are a large number of engaging projections and engaging grooves.

[0114] REFERENCE SIGNS LIST 1...Work machine system, 2...Hammer drill, 3...Auxiliary device (dust collector), 10...Housing, 11...First housing (gear case), 12...Second housing (main body housing), 12a...Air intake surface, 13...Third housing (handle housing), 13a...Anti-vibration handle, 13b...Sub-handle, 14...Air intake port (dust collection port), 15...Air intake port (side air intake port), 16...Air intake port (bottom air intake port), 17...Exhaust port, 20...Motor, 21...Controller, 22...Output shaft, 23...Pinion gear , 24...Trigger, 25...Trigger switch, 26...Battery pack, 30...Power transmission mechanism, 31...Intermediate shaft, 32...Motion conversion section, 33...Cylinder, 34...Ring gear, 35...Retainer sleeve, 40...Blowing mechanism, 41...Fan, 42...Fan guide, 43a...Base plate, 43b...First fan, 43c...Second fan, 44...Guide base, 44a...Inlet, 45...Partition wall, 46...Current plate, 47...Guide wall, 48...Outlet, 50...Cover, 51...Suction section, 52...Dust collection section, 53 ...Connecting portion, 53a...bottom wall portion, 53b, 53c...side wall portions, 54...side opening, 55...bottom opening, 56...suction nozzle, 57...cyclone portion, 58...filter chamber, 59...connecting nozzle, 59a...opening, 60...closing portion, 61...coil spring, 70...engaging portion (engaging groove), 71...first engaging portion (first engaging groove), 72...second engaging portion (second engaging groove), 73...third engaging portion (third engaging groove), 74...fourth engaging portion (fourth engaging groove), 75...fifth engaging portion (fifth engaging groove), 76...sixth engaging portion (sixth engaging groove) , 80...engagement portion (engagement protrusion), 81...first engagement portion (first engagement protrusion), 82...second engagement portion (second engagement protrusion), 83...third engagement portion (third engagement protrusion), 84...fourth engagement portion (fourth engagement protrusion), 85...fifth engagement portion (fifth engagement protrusion), 86...sixth engagement portion (sixth engagement protrusion), 90...regulating portion, 91...plate portion, 92...claw portion, 93...operating portion, 94...connecting portion, 95...support shaft, 96...coil spring, 97...recess, R1...passage, R2...passage, R3...passage, T...tipped tool, W1...dust collection air, W2...cooling air

Claims

1. A drive unit; A fan driven by the drive unit; a housing that accommodates the drive unit and the fan, The housing includes: A first intake port; a first intake passage that serves as a passage for air flowing from the first intake port to the fan; a first exhaust passage which serves as a passage for air flowing from the fan to the first intake port; a closing portion switchable between a first state in which the first intake passage is opened and a second state in which the first intake passage is closed.

2. The work machine according to claim 1 , wherein the closing portion closes the first exhaust passage in the first state and opens the first exhaust passage in the second state.

3. A fan guide is provided with an inlet through which air flows in and an outlet through which air flows out, the fan guide is disposed around the fan, the first intake passage is connected to the inlet of the fan guide, The work machine according to claim 1 , wherein the first exhaust passage is connected to the outlet of the fan guide.

4. The work machine according to claim 1 , wherein the housing has a second intake port and a second intake passage that serves as a passage for air flowing from the second intake port to the fan.

5. 5. The work machine according to claim 4, wherein the fans include a first fan connected to the first intake port via the first intake passage, and a second fan connected to the second intake port via the second intake passage.

6. the housing has an intake surface in which the first intake port is formed, The closing portion has a plate shape that is aligned along the intake surface, The first intake passage extends in a direction intersecting the intake surface, The work machine according to claim 1 , wherein the first exhaust passage extends along the intake surface.

7. The work machine according to claim 1 , wherein the housing has a biasing portion that biases the closing portion so that the closing portion is held in the second state.

8. A drive unit, A fan driven by the drive unit; a housing that houses the drive unit and the fan and to which a dust collecting device can be attached, The housing has a dust collection port through which air flows from the dust collection device into the inside of the housing when the dust collection device is attached, and through which air flows from the inside of the housing to the outside when the dust collection device is not attached.