Work equipment and work equipment systems

Abstract

To achieve a work machine and a work machine system, in which excellent dust collection performance is maintained over a long period of time.SOLUTION: A hammer drill 2 includes: a drive section; a fan which is driven by the drive section; and a housing 10 which stores the drive section and the fan. The housing 10 has an intake surface 12a provided with a dust collection port 14 for sucking air from an auxiliary device and a first engagement groove 71 and a second engagement groove 72, which are relatively movably engaged with the auxiliary device. The dust collection port 14 is arranged between the first engagement groove 71 and the second engagement groove 72 in a vertical direction parallel to the intake surface 12a and in a right and left direction parallel to the intake surface 12a and orthogonal to the vertical direction.SELECTED DRAWING: Figure 4

Description

Technical Field

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

Background Art

[0002] A working machine having a function of collecting dust (dust collection function) generated during work is known. For example, Patent Document 1 describes a drilling tool having a dust collection function. The drilling tool is an example of a working machine and is suitable for hole drilling work and the like. The drilling tool may also be called a "percussion 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, air mixed with dust is sucked in. The sucked air mixed with dust is separated into air and dust. Further, the dust separated from the air is collected, and the air from which the dust has been removed is exhausted. That is, when the dust collection fan rotates, an air flow (dust collection air flow) for collecting dust is generated.

[0004] Also, when the cooling fan rotates, air is sucked in. The sucked air is exhausted after taking heat from a motor or the like. That is, when the cooling fan rotates, an air flow (cooling air flow) for cooling the heat generating part such as a motor is generated.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] For a working machine or a working machine system having a dust collection function, it is required to achieve and maintain good dust collection performance.

[0007] The objective of the present invention is to realize a work machine or work machine system that maintains good dust collection performance over a long period of time. [Means for solving the problem]

[0008] A work machine according to one embodiment comprises a drive unit, a fan driven by the drive unit, and a housing that houses the drive unit and the fan. The housing has an intake surface provided with an air intake port for drawing in air from an auxiliary device, and an engagement portion including a first engagement portion and a second engagement portion that engage with the auxiliary device so as to be movable relative to it. The air intake port is positioned between the first engagement portion and the second engagement portion in a first direction parallel to the intake surface, and in a second direction parallel to the intake surface and perpendicular to the first direction. [Effects of the Invention]

[0009] According to the present invention, a work machine or work machine system that maintains good dust collection performance over a long period of time can be realized. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view of the work equipment system. [Figure 2] This is a cross-sectional view of the work equipment system. [Figure 3] This is an objective view of a hammer drill. [Figure 4] This is a front view of a hammer drill. [Figure 5] This is a perspective view of the dust collector. [Figure 6] This is a rear view of the dust collector. [Figure 7] This is a cross-sectional view of a dust collector. [Figure 8] This is an exploded perspective view of the air blower mechanism. [Figure 9] This is a partially enlarged cross-sectional view showing the blowing mechanism and its vicinity when the connecting nozzle is inserted into the dust collection port. [Figure 10] This is a partially enlarged cross-sectional view showing the blowing mechanism and its vicinity when the connecting nozzle is not inserted into the dust collection port. [Figure 11] Partial enlarged perspective view showing the closure part just before the dust collecting device is attached to the hammer drill. [Figure 12] Partial enlarged perspective view showing the closure part after the dust collecting device is attached to the hammer drill. [Figure 13] Explanatory drawing showing the process of attaching the dust collecting device to the hammer drill. [Figure 14] Plan view of the regulating part. [Figure 15] Plan view of the work machine system. [Figure 16] Perspective view showing a modified example of the hammer drill 2. [Figure 17] Perspective view showing a modified example of the dust collecting device 3. [Figure 18] Explanatory drawing showing the process of attaching the dust collecting device shown in Fig. 17 to the hammer drill shown in Fig. 16.

Mode for Carrying Out the Invention

[0011] Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. The work machine according to this embodiment is a hammer drill suitable for drilling work etc. In all the drawings referred to in order to explain the embodiments of the present invention, the same or substantially the same components and elements are denoted by the same reference numerals. Also, for the components and elements once described, in principle, repeated explanations will not be made.

[0012] <Overview of the Hammer Drill> Fig. 1 is a perspective view of a work machine system 1 composed of 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. Note that the auxiliary device 3 shown in Figs. 1 and 2 is detachable from the hammer drill 2.

[0013] The hammer drill 2 consists of a housing 10, a motor 20, a power transmission mechanism 30, a blower mechanism 40, etc., and the cutting tool T is attached to it. More specifically, the base end (root end) of the cutting tool T is fixed to the hammer drill 2. The hammer drill 2 drives the cutting tool 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 power source for the cutting tool T.

[0014] Furthermore, the hammer drill 2 uses the driving force of the motor 20 to drive the blower mechanism 40, generating an airflow (dust-collecting airflow) for collecting dust generated during operation. More specifically, when the blower mechanism 40 is activated, dust-mixed air is drawn into the auxiliary device 3, preventing or suppressing the scattering of dust into the surroundings.

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

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

[0017] In the following description, the axial direction of the tip tool T shown in Figure 2 will be referred to as the "front-to-back direction." Furthermore, the tip side of the tip tool T will be referred to as the "front," and the base end side of the tip tool T will be referred to as the "rear." The auxiliary device 3 will be referred to as the "dust collector 3." Note that the axial direction (front-to-back direction) of the tip tool T corresponds to the third direction of this invention.

[0018] The Hammer Drill 2 has multiple operating modes, including "Drill Mode," "Hammer Mode," and "Hammer Drill Mode." When Drill Mode is selected, rotational force is applied to the tool tip T. When Hammer Mode is selected, impact force is applied to the tool tip T. When Hammer Drill Mode is selected, both rotational and impact force is applied to the tool tip T.

[0019] One example of a tool bit T attached to a hammer drill 2 is a drill bit. Drill bits are used, for example, to drill holes in concrete or stone. However, the tool bits T attached to a hammer drill 2 are not limited to drill bits. The tool bits T attached to a hammer drill 2 are selected according to the object being worked on and the nature of the work.

[0020] <Housing> The housing 10 forms the outer casing 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 casing, a second housing 12 that forms the middle part of the outer casing, and a third housing 13 that forms the rear part of the outer casing.

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

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

[0023] The handle housing 13 and the main body housing 12 are connected via an elastic material such as rubber or a spring. Alternatively, the handle housing 13 forms a vibration-damping handle 13a in which vibration transmission from the main body housing 12 is suppressed.

[0024] The hammer drill 2 of this embodiment is equipped with a sub-handle 13b that extends in a direction perpendicular to the vibration-damping handle 13a. In the following description, the extension direction of the sub-handle 13b will be referred to as the "left-right direction." Note that the extension direction of the sub-handle 13b (left-right direction) corresponds to the second direction of the present invention.

[0025] <Air intake port, exhaust port> Figure 3 is a perspective view of the hammer drill 2, and Figure 4 is a front view of the hammer drill 2. One air intake port 14 is provided on the upper part of the front wall of the main housing 12. The air intake port 14 penetrates the front wall of the main housing 12 and communicates with the inside and outside of the main housing 12. In other words, the front wall of the main housing 12 is the intake surface on which the air intake port 14 is formed. Therefore, in the following explanation, the front wall of the main housing 12 may be referred to as the "intake surface 12a".

[0026] Multiple air intake ports 15 are provided at the lower part of both side walls of the main housing 12. In addition, multiple air intake ports 16 (Figure 2) are provided on the bottom wall of the main housing 12. More specifically, three air intake ports 15 are provided at the lower part of each side wall of the main housing 12. In addition, ten air intake ports 16 are provided on the bottom wall of the main housing 12.

[0027] Furthermore, multiple exhaust ports 17 are provided on the upper part of the main housing 12. More specifically, five exhaust ports 17 are provided on the upper part of the main housing 12.

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

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

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

[0031] In the following description, the axial direction of the output shaft 22 is defined as the "up and down direction." Furthermore, the tip side of the output shaft 22 on which the pinion gear 23 is located is defined as "upward," and the opposite side is defined as "downward." Note that the axial direction (up and down direction) of the output shaft 22 corresponds to the first direction of the present invention.

[0032] The handle housing 13 is equipped with a trigger 24 and a trigger switch 25. The trigger 24 protrudes forward from the top of the vibration-damping handle 13a. The trigger switch 25, on the other hand, is located inside the vibration-damping 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 the 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 tip T. The power transmission mechanism 30 transmits rotational driving force or reciprocating driving force to the tool tip T according to the operating mode selected by the operator.

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

[0036] The intermediate shaft 31 extends in a direction perpendicular to the output shaft 22 of the motor 20 (in the front-rear direction). 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 conversion unit 32 is mounted 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 arranged around the inner ring. The rolling elements are interposed between the inner and outer rings, and the connecting rod extends radially outward from the outer circumferential surface of the outer ring.

[0038] Intersecting grooves are formed on the outer circumferential surface of the inner ring and the inner circumferential surface of the outer ring. A portion of the rolling element fits into the groove formed in the inner ring, and another portion of the rolling element fits 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 that they can rotate relative to each other.

[0039] A clutch is provided on the intermediate shaft 31 that can be switched between a engaged state in which power is transmitted from the intermediate shaft 31 to the motion conversion unit 32, and a disengaged state in which power is not transmitted from the intermediate shaft 31 to the motion conversion unit 32. The clutch is movable back and forth along the intermediate shaft 31.

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

[0041] The clutch movement described above is achieved in response to the operator switching the operating mode. When the clutch is engaged, the intermediate shaft 31 rotates, causing the inner ring to rotate. As a result, the outer ring rolls along the surface of the inner ring. Consequently, the connecting rod swings back and forth.

[0042] The cylinder 33 is mounted above the intermediate shaft 31, parallel to the intermediate shaft 31. The ring gear 34 is mounted 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 an unconnected state in which the rotation of the intermediate shaft 31 is not transmitted to the cylinder 33. The switching of the ring gear 34 is achieved according to the operator's operation mode switching operation. In the unconnected state, the ring gear 34 rotates freely on the cylinder 33.

[0043] The cylinder 33 houses a piston, a striker, and a meson. The piston, striker, and meson are arranged in a single line from rear to front, with an air chamber provided between the piston and the striker.

[0044] The retainer sleeve 35 is positioned in front of the cylinder 33 and coaxially with the cylinder 33. The rear end of the retainer sleeve 35 is fixed to the tip of the cylinder 33 in a non-rotatable manner. The base end of the cutting tool T is inserted into the retainer sleeve 35, and the retainer sleeve 35 holds the base end of the inserted cutting tool T. In other words, the retainer sleeve 35 is an example of a tool mounting part to which a cutting tool 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 of the piston. When the connecting rod swings back and forth, the piston reciprocates within the cylinder 33, causing the pressure in the air chamber to fluctuate. This pressure fluctuation in the air chamber drives the striker, which strikes the meson, and the meson strikes the tip tool T.

[0046] In this embodiment, when 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 conversion unit 32 does not rotate, while the cylinder 33 rotates. Therefore, only rotational force is applied to the tip tool T held in the retainer sleeve 35.

[0047] On the other hand, when the hammer mode is selected, the clutch engages and the ring gear 34 becomes disengaged. In this state, when the intermediate shaft 31 rotates, the inner ring of the motion conversion unit 32 rotates, while the cylinder 33 does not. As a result, the piston reciprocates within the stationary cylinder 33. Consequently, only impact force is applied to the tip tool T held in the retainer sleeve 35.

[0048] Furthermore, when the hammer drill mode is selected, the clutch engages and the ring gear 34 becomes connected. When the intermediate shaft 31 rotates in this state, the inner ring of the motion conversion unit 32 rotates, and the cylinder 33 also rotates. As a result, the piston reciprocates within the rotating cylinder 33. Consequently, both rotational and impact forces are applied to the cutting tool T held in the retainer sleeve 35.

[0049] <Dust collector> Figure 5 is a perspective view of the dust collector 3. Figure 6 is a rear view of the dust collector 3, and Figure 7 is a cross-sectional view of the dust collector 3. The dust collector 3 consists of a cover 50, a suction unit 51, and a dust collection unit 52, etc. As previously described, 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 Figures 1 and 2). Alternatively, part of the dust collector 3 attached to the main body housing 12 is located below the gear case 11, and the other part of the dust collector 3 protrudes in front of the gear case 11.

[0050] Furthermore, the Hammer Drill 2 can be used independently. Therefore, if dust collection is not necessary or desired, it is not necessary to attach the dust collector 3 to the Hammer Drill 2.

[0051] <Cover> The cover 50 forms the outer casing of the dust collector 3. The cover 50 is composed of two cover members. When the two cover members are butted together, the cover 50 is formed. A portion of the cover 50 forms a connecting portion 53, which is located behind the dust collection section 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 and 53c that rise 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 and 53c of the connecting portion cover the side walls of the main housing 12 from the sides.

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

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

[0055] When the blower mechanism 40 shown in Figure 2 is activated, the air surrounding the tip of the cutting tool T is drawn into the suction unit 51 through the suction nozzle 56. At this time, if dust is floating around the cutting tool T, that dust is also drawn into the suction unit 51 along with the air. In other words, air mixed with dust is drawn into the suction unit 51. The structure and operation of the blower mechanism 40 will be explained in more detail later.

[0056] <Dust Collection Unit> The suction unit 51 is in communication with the dust collection unit 52. Therefore, the dust-mixed air sucked into the suction unit 51 flows into the dust collection unit 52. The dust collection unit 52 is equipped with a cyclone unit 57. The dust-mixed air that flows into the dust collection unit 52 is separated into air and dust in the cyclone unit 57. In other words, the dust in the air is separated by centrifugal force.

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

[0058] The connecting nozzle 59 has a cylindrical shape extending 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 connecting nozzle 59 is connected to the main body housing 12. More specifically, the connecting nozzle 59 is inserted into the dust collection port 14 of the main body housing 12. As a result, the hammer drill 2 (main body housing 12) and the dust collector 3 are in communication via the connecting nozzle 59.

[0059] <Air blowing mechanism> Figure 8 is an exploded perspective view of the blower mechanism 40. The blower mechanism 40 consists of a fan 41, a fan guide 42, and the like. 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 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 positioned around the fan 41, enclosing it. In other words, the fan 41 is housed within the fan guide 42. As shown in Figure 2, the blower mechanism 40, including the fan 41 and the fan guide 42, is positioned above the motor 20, and the output shaft 22 of the motor 20 protrudes above the blower mechanism 40, passing through the fan 41 and the fan guide 42. Furthermore, the output shaft 22 of the motor 20 is fixed to the fan 41. Thus, when the motor 20 is operating, the fan 41 rotates inside the fan guide 42. More specifically, the first fan 43b and the second fan 43c, shown in Figure 8, rotate simultaneously inside the fan guide 42.

[0061] The fan guide 42 includes a guide base 44 positioned above the fan 41. An inlet 44a communicating with the fan 41 is provided in the center of the guide base 44. Alternatively, the inlet 44a communicating with the fan 41 is located in the ceiling of the fan guide 42, which is 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 inlet 44a in the circumferential direction, 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 partitioned from the surroundings and communicates with the inlet 44a.

[0063] Figure 9 is a partially enlarged cross-sectional view showing the blower mechanism 40 and its vicinity when the connecting nozzle 59 is inserted into the dust collection port 14. Figure 10 is a partially enlarged cross-sectional view showing the blower mechanism 40 and its vicinity when the connecting 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. Alternatively, the passage R1 extends in a direction that intersects with the intake surface 12a, connecting the dust collection port 14 and the inlet 44a.

[0065] <First intake passage> As shown in Figure 9, when the dust collector 3 is attached to the hammer drill 2, the connecting nozzle 59 of the dust collector 3 is inserted into the dust collection port 14 of the main housing 12. Furthermore, the connecting nozzle 59 inserted into the dust collection port 14 is inserted into the inside of the partition wall 45. Alternatively, the connecting 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, a dust-collecting airflow W1 is generated. More specifically, dust-mixed air is drawn into the suction section 51 via the suction nozzle 56 of the dust collector 3. The dust-mixed air drawn into the suction section 51 passes through the cyclone section 57 and the filter chamber 58, and then flows out from the connecting nozzle 59 inserted into the dust collection port 14. The air flowing out from the connecting nozzle 59 passes through the passage R1 and flows into the fan guide 42 from the inlet 44a and into the first fan 43b. The air that flows into the first fan 43b is blown out radially outward from the first fan 43b.

[0067] As described above, passage R1 is at least a part of the passage for the dust collection air 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 passage R1. In other words, passage R1 corresponds to the first intake passage of the present invention, or at least a part of the first intake passage. The first fan 43b is a dust collection fan that generates the dust collection air W1.

[0068] As shown in Figure 5, the upper surface of the connecting nozzle 59 is provided with two openings 59a to increase the dust collection airflow W1.

[0069] <Second intake passage> When the second fan 43c rotates, air is drawn into the main housing 12 through the side intake port 15 (Figure 3) and the bottom intake port 16 (Figure 2). The air drawn into the main housing 12 passes through the motor 20 and controller 21 (Figure 2), cooling them. Alternatively, when the second fan 43c rotates, a cooling airflow W2 is generated to cool the heat-generating parts such as the motor 20.

[0070] More specifically, the air drawn into the main 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 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 then blown radially outward from 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. Alternatively, passage R2 is the passage for the cooling air W2 that flows from the side intake port 15 and the bottom intake port 16 to the second fan 43c. The second fan 43c is connected to the side intake port 15 and the bottom intake port 16 via passage R2. In other words, passage R2 corresponds to the second intake passage of the present invention, or at least a part of the second intake passage. The second fan 43c is a cooling fan that generates the cooling air W2.

[0072] Most of the air blown out from the fan 41 (dust collection air W1, cooling air W2) is directed upwards to the fan guide 42 by the rectifier plate 46. The dust collection air W1 and cooling air W2 directed upwards to the fan guide 42 are exhausted out of the housing 10 through the exhaust port 17.

[0073] <First exhaust passage> The fan guide 42 is provided with an outlet 48. The outlet 48 is formed by a notch formed in the lower part of the guide wall 47 and is located radially outward of the second fan 43c (see Figure 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 dust outlet port 48. The closing section 60 will be explained in detail later, but when the dust collector 3 is attached to the hammer drill 2, the closing section 60 closes the dust outlet port 48 and opens the dust collection port 14 (Figure 9). On the other hand, when the dust collector 3 is removed from the hammer drill 2, the closing section 60 opens the dust outlet port 48 and closes the dust collection port 14 (Figure 10).

[0075] Therefore, as shown in Figure 10, when the second fan 43c rotates while the dust collector 3 is not attached to the hammer drill 2, a portion of the cooling air W2 flows out from the outlet 48 to the side of the fan guide 42. The cooling air W2 that flows 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 closing part 60.

[0076] On the other hand, as shown in Figure 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. Alternatively, 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 housing 12 forms at least a portion of the passage R3 for the cooling air W2 flowing from the second fan 43c to the dust collection port 14. Alternatively, passage R3 is the 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. Also, as shown in Figures 9 and 10, passage R3 extends along the intake surface 12a between the outlet 48 and the dust collection port 14. In other words, passage R3 corresponds to the first exhaust passage of the present invention, or at least a portion of the first exhaust passage.

[0078] <Closing part> As shown in Figures 3 and 4, the closing portion 60 is plate-shaped and follows the intake surface 12a of the main housing 12. Figure 11 is a partially enlarged perspective view showing the closing portion 60 just before the dust collector 3 is attached to the hammer drill 2. Figure 12 is a partially enlarged perspective view showing the closing portion 60 after the dust collector 3 has been attached to the hammer drill 2.

[0079] The closing section 60 is supported so as to be slidable vertically. Furthermore, the closing section 60 is constantly biased upward by a biasing section (coil spring 61). When the tapered tip of the connecting nozzle 59 is pressed against it, the closing section 60 is pushed down against the biasing force of the coil spring 61. As a result, as shown in Figure 9, the dust collection port 14 opens, opening the passage R1, while the outlet 48 closes. Furthermore, the connecting nozzle 59 enters the passage R1 through the dust collection port 14. Alternatively, when the dust collector 3 is attached to the hammer drill 2, it pushes down the closing section 60 against the biasing force of the coil spring 61, opening the passage R1.

[0080] On the other hand, when the connecting nozzle 59 is withdrawn from the dust collection port 14, the closing section 60 is pushed up by the biasing 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. Alternatively, when the dust collector 3 is removed from the hammer drill 2, the passage R1 is automatically closed.

[0081] In other words, the closing section 60 can be switched between a first state (Figure 9) in which passage R1 is open and passage R3 is closed, and a second state (Figure 10) in which passage R1 is closed and passage R3 is open.

[0082] When the closing section 60 is switched to the second state, a portion of the cooling air W2 flows out of the housing 10 through the gap between the dust collection port 14 and the closing section 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 section 60. As a result, dust accumulated in the gap between the dust collection port 14 and the closing section 60 does not hinder the smooth opening and closing of the closing section 60.

[0083] <Engagement part> As shown in Figures 3 and 4, the housing 10 of the hammer drill 2 is provided with a plurality of engaging parts 70 that engage with the dust collector 3 in a manner that allows for relative movement. More specifically, the main body housing 12 is provided with a first engaging part 71, a second engaging part 72, a third engaging part 73, and a fourth engaging part 74.

[0084] Each engaging portion 70 is a groove that is recessed in the left-right direction and extends in the front-back direction. In other words, each engaging portion 70 is a groove with the left-right direction as the depth direction and the front-back direction as the length direction. Therefore, in the following description, the engaging portions provided in the housing 10 of the hammer drill 2 may be referred to as "engaging grooves".

[0085] The first engagement groove 71 and the third engagement groove 73 are located at the same position in the vertical direction. Similarly, the second engagement groove 72 and the fourth engagement groove 74 are located at the same position in the vertical direction. In other words, the first engagement groove 71 and the third engagement groove 73 are located at the same height, and the second engagement groove 72 and the fourth engagement groove 74 are located 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 where the dust collection port 14 is located. The dust collection port 14 is located between the first engagement groove 71 and the second engagement groove 72 in the vertical direction parallel to the intake surface 12a. Furthermore, 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, which is parallel to the intake surface 12a and perpendicular to the vertical 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 also between the third engagement groove 73 and the fourth engagement groove 74 in the horizontal direction.

[0088] As shown in Figures 5 and 6, the dust collector 3 is provided with a plurality of engaging parts 80 that engage with the housing 10 of the hammer drill 2 in a manner that allows for relative movement. More specifically, a first engaging part 81, a second engaging part 82, a third engaging part 83, and a fourth engaging part 84 are provided on the upper, lower, left, and right sides inside the connecting part 53.

[0089] Each engaging portion 80 is a projection that protrudes in the left-right direction and extends in the front-back direction. In other words, each engaging portion 80 is a projection with the left-right direction as the height direction and the front-back direction as the length direction. Therefore, in the following description, the engaging portions provided on the dust collector 3 may be referred to as "engaging projections".

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

[0091] More specifically, the illustrated third engaging projection 83 is inserted parallel to each other into the third engaging groove 73, and the second engaging projection 82 is inserted parallel to each other into the second engaging groove 72. Additionally, the not illustrated first engaging projection 81 is inserted parallel to each other into the first engaging groove 71, and the fourth engaging projection 84 is inserted parallel to each other into the fourth engaging groove 74.

[0092] The engaging projection 80, inserted into the engaging groove 70, moves backward along the engaging groove 70 and enters the engaging groove 70 by a predetermined length. Alternatively, the engaging groove 70 into which the engaging projection 80 is inserted moves forward along the engaging projection 80 and accepts the engaging projection 80 by a predetermined length. The predetermined length is the same as or approximately the same as the total length of the engaging groove 70 and the engaging projection 80.

[0093] On the other hand, when the dust collector 3 is removed from the hammer drill 2, the engaging projection 80, which was inserted into the engaging groove 70, moves forward along the engaging groove 70 and disengages from it. Alternatively, the engaging groove 70, which was receiving the engaging projection 80, moves backward along the engaging projection 80 and releases it. In other words, the engaging groove 70 provided in the housing 10 of the hammer drill 2 engages with the dust collector 3 so as to be able to move relative to it in the front-rear direction.

[0094] <Regulatory Department> As shown in Figures 5 and 7, the dust collector 3 is equipped with a restricting section 90. The restricting section 90 restricts the relative movement of the engagement groove 70 of the hammer drill 2 with respect to the dust collector 3.

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

[0096] As shown in Figures 5 and 7, the restricting section 90 is located on the upper part of the dust collector 3 and extends parallel to the suction section 51. Most of the restricting section 90 is housed inside the cover 50 of the dust collector 3, but the claw section 92 protrudes (is exposed) outside the cover 50.

[0097] The restricting portion 90 is rotatably (oscillately) 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 located beneath the plate portion 91.

[0098] As shown in Figure 2, when the dust collector 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 lower surface of the gear case 11. As a result, the relative movement of the engagement groove 70 of the hammer drill 2 with respect to the dust collector 3 is restricted. Alternatively, the dust collector 3 is fixed to the hammer drill 2.

[0099] To remove the dust collector 3 from the hammer drill 2, the engagement of the claw portion 92 with the hammer drill 2 is released. Specifically, the operating portion 93 (Figure 5) is pressed, and the restricting portion 90 is rotated downward against the biasing force of the coil spring 96 (Figure 7). This pushes down the claw portion 92 shown in Figure 2, causing it to detach from the recess 97. Then, pulling the dust collector 3 forward separates the hammer drill 2 from the dust collector 3. Alternatively, pulling the hammer drill 2 backward separates the hammer drill 2 from the dust collector 3.

[0100] Figure 15 is a plan view of the work machine system 1. As previously described, the operating section 93 of the regulating section 90 is offset. As a result, when the dust collector 3 is attached to the hammer drill 2, the operating section 93 protrudes to the side of the tip tool T attached to the hammer drill 2. In other words, the position of the operating section 93 of the regulating section 90 does not coincide with the tip tool T in the left-right direction. Although not shown in Figure 15, the claw portion 92 of the regulating section 90 coincides with the position of the tip tool T in the left-right direction.

[0101] As described above, in this embodiment, the dust collector 3 is attached to the hammer drill 2 by the cooperation of the engaging groove 70 and recess 97 provided on the hammer drill 2 and the engaging projection 80 and restricting portion 90 provided on the dust collector 3. In other words, the dust collector 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, rattling of the dust collector 3 attached to the hammer drill 2 is prevented, and airtightness between the two is ensured. As a result, leakage of the dust collection airflow W1 is prevented or suppressed, and good dust collection performance is obtained.

[0102] Furthermore, in addition to the intake surface 12a where the dust collection port 14 is formed being oriented in the front-rear direction, the engagement groove 70 and engagement projection 80 engage so as to be able to move relative to each other in the front-rear direction. Moreover, the restricting portion 90 restricts the relative movement of the engagement groove 70 and engagement projection 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, and airtightness between the dust collection port 14 and the connecting nozzle 59 is reliably ensured. In particular, in this embodiment, since the engagement groove 70 and engagement projection 80 are arranged above, below, left, and right of the dust collection port 14, airtightness between the dust collection port 14 and the connecting nozzle 59 is more reliably ensured.

[0103] Furthermore, 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 any of the up, down, left, or right directions. Specifically, for example, the first engagement portion 71 shown in Figure 4 may be extended to the right and positioned so that its position in the left-right direction overlaps with the dust collection port 14.

[0104] Furthermore, since the operating section 93 of the regulating section 90 is offset, the tip tool T does not get in the way when operating the operating section 93. From another perspective, the dust collector 3 can be attached to and detached from the hammer drill 2 without removing the tip tool T from the hammer drill 2.

[0105] The present invention is not limited to the embodiments described above, and various modifications are possible without departing from its spirit. For example, the number of engagement grooves 70 and engagement projections 80 can be increased or decreased as appropriate. For example, engagement grooves 70 and engagement projections 80 that differ in position and length from those described above may be added.

[0106] Figure 16 is a perspective view showing one modified example of the hammer drill 2. Figure 17 is a perspective view showing one modified example of the dust collector 3.

[0107] The hammer drill 2 shown in Figure 16 has a fifth engaging part (fifth engaging groove) 75 and a sixth engaging part (sixth engaging groove) 76 added to it. Similarly, the dust collector 3 shown in Figure 17 has a fifth engaging part (fifth engaging projection) 85 and a sixth engaging part (sixth engaging projection) 86 added to it. The fifth engaging projection 85 is inserted into the fifth engaging groove 75, and the sixth engaging projection 86 is inserted into the sixth engaging groove 76.

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

[0109] In other words, the fifth engaging projection 85 and the sixth engaging projection 86 are spaced forward relative to the first engaging projections 81 to the fourth engaging projections 84. The fifth engaging groove 75 and the sixth engaging groove 76 are spaced forward relative to the first engaging grooves 71 to the fourth engaging groove 74. As a result, the engagement range can be expanded in the front-rear direction without increasing the engagement depth between the projections and grooves. Another way of looking at it is that 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 projection 80 are engaged, the vertical gap between the second engagement projection 82 and the fourth engagement projection 84 and the second engagement groove 72 and the fourth groove 74 is larger than the vertical gap between the first engagement projection 81 and the third engagement projection 83 and the first engagement groove 71 and the third engagement groove 73. Also, when the engagement groove 70 and the engagement projection 80 are engaged, the vertical gap between the first engagement projection 81 and the third engagement projection 83 and the first engagement groove 71 and the third engagement groove 73 is larger than the vertical gap between the fifth engagement projection 85 and the sixth engagement projection 86 and the fifth engagement groove 75 and the sixth engagement groove 76.

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

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

[0113] As described above, since the engaging projections are inserted into the engaging grooves in sequence, it is easy to insert the engaging projections into the engaging grooves despite the presence of numerous engaging projections and grooves. [Explanation of Symbols]

[0114] 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…Intake surface, 13…Third housing (handle housing), 13a…Anti-vibration handle, 13b…Sub-handle, 14…Intake port (dust collection port), 15…Intake port (side intake port), 16…Intake port (bottom 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 unit, 33...Cylinder, 34...Ring gear, 35...Retainer sleeve, 40...Blower mechanism, 41...Fan, 42...Fan guide, 43a...Base plate, 43b...First fan, 43c...Second fan, 44...Guide base, 44a...Inlet, 45...Partition wall, 46...Rectifier plate, 47...Guide wall, 48...Outlet, 50...Cover, 51...Suction unit, 52...Dust collection unit, 53 ...connecting section, 53a...bottom wall section, 53b, 53c...side wall section, 54...side opening, 55...bottom opening, 56...suction nozzle, 57...cyclone section, 58...filter chamber, 59...connecting nozzle, 59a...opening, 60...closing section, 61...coil spring, 70...engaging section (engaging groove), 71...first engaging section (first engaging groove), 72...second engaging section (second engaging groove), 73...third engaging section (third engaging groove), 74...fourth engaging section (fourth engaging groove), 75...fifth engaging section (fifth engaging groove), 76...sixth engaging section (sixth engaging groove) 80...Engaging part (engaging projection), 81...First engaging part (first engaging projection), 82...Second engaging part (second engaging projection), 83...Third engaging part (third engaging projection), 84...Fourth engaging part (fourth engaging projection), 85...Fifth engaging part (fifth engaging projection), 86...Sixth engaging part (sixth engaging projection), 90...Restricting part, 91...Plate part, 92...Claw part, 93...Operating part, 94...Connecting part, 95...Support shaft, 96...Coil spring, 97...Recess, R1...Passage, R2...Passage, R3...Passage, T...Tip tool, W1...Dust collection air, W2...Cooling air

Claims

1. A tool mounting section to which a cutting tool is attached, The drive unit and A fan driven by the aforementioned drive unit, The housing comprises the drive unit and the fan, The aforementioned housing is An intake surface is provided with an air intake port for drawing in air from an auxiliary device, It has an engagement portion including a first engagement portion and a second engagement portion that engage with the auxiliary device in a manner that allows relative movement, The intake port is positioned between the first engaging portion and the second engaging portion in a first direction parallel to the intake surface and a second direction parallel to the intake surface and perpendicular to the first direction, and the first engaging portion and the second engaging portion are engaged with the auxiliary device so as to be movable relative to it in a third direction perpendicular to the first and second directions. The engaging portion is a groove whose length is oriented in the third direction, in a work machine.

2. A drive unit and A fan driven by the aforementioned drive unit, The housing comprises the drive unit and the fan, The aforementioned housing is An intake surface is provided with an air intake port for drawing in air from an auxiliary device, It has an engagement portion including a first engagement portion and a second engagement portion that engage with the auxiliary device in a manner that allows relative movement, The intake port is positioned between the first engaging portion and the second engaging portion in a first direction parallel to the intake surface and a second direction parallel to the intake surface and perpendicular to the first direction. The first engaging portion and the second engaging portion engage with the auxiliary device so as to be movable relative to it in a third direction perpendicular to the first and second directions. A work machine having a tool mounting section to which a tip tool extending in the third direction is attached.

3. The engagement portion further includes a third engagement portion whose position in the first direction is the same as that of the first engagement portion, and a fourth engagement portion whose position in the first direction is the same as that of the second engagement portion. The work machine according to claim 1, wherein the first engaging portion, the second engaging portion, the third engaging portion, and the fourth engaging portion are grooves with the second direction as the depth direction and the third direction as the length direction.

4. The work machine according to claim 3, wherein the engaging portion further includes a fifth engaging portion and a sixth engaging portion whose positions in the third direction differ from those of the first engaging portion, the second engaging portion, the third engaging portion and the fourth engaging portion, and the fifth engaging portion and the sixth engaging portion are grooves with the second direction as the depth direction and the third direction as the length direction.

5. The lengths of the first engagement portion and the third engagement portion in the third direction are shorter than the lengths of the second engagement portion and the fourth engagement portion in the third direction. The work machine according to claim 4, wherein the lengths of the fifth engagement portion and the sixth engagement portion in the third direction are shorter than the lengths of the first engagement portion and the third engagement portion in the third direction.

6. A work machine system comprising a work machine and an auxiliary device that can be attached to or detached from the work machine, The aforementioned work machine comprises a tool mounting section to which a cutting tool is attached, a drive unit, a fan driven by the drive unit, and a housing that accommodates the drive unit and the fan. The aforementioned housing is An intake surface is provided with an air intake port for drawing in air from the aforementioned auxiliary device, It has an engagement portion including a first engagement portion and a second engagement portion that engage with the auxiliary device in a manner that allows relative movement, The intake port is positioned between the first engaging portion and the second engaging portion in a first direction parallel to the intake surface and a second direction parallel to the intake surface and perpendicular to the first direction. The tool mounting portion is equipped with a tip tool that extends in a third direction perpendicular to the first and second directions. A work machine system wherein the first engaging portion and the second engaging portion engage with the auxiliary device so as to be movable relative to the third direction.

7. The work machine system according to claim 6, wherein the auxiliary device has a restricting part that restricts the relative movement of the first engaging part and the second engaging part.

8. The restricting unit has a claw portion that engages with the work machine and an operating portion that releases the engagement of the claw portion with the work machine. The claw portion is positioned such that in the second direction it overlaps with the tip tool attached to the tool mounting portion. The work machine system according to claim 7, wherein the position of the operating unit in the second direction does not overlap with the tip tool attached to the tool mounting unit.

9. A work machine system comprising a work machine and an auxiliary device that can be attached to or detached from the work machine, The aforementioned work machine comprises a tool mounting section to which a cutting tool is attached, a drive unit, a fan driven by the drive unit, and a housing that accommodates the drive unit and the fan. The aforementioned housing is An intake surface is provided with an air intake port for drawing in air from the aforementioned auxiliary device, It has an engagement portion including a first engagement portion and a second engagement portion that engage with the auxiliary device in a manner that allows relative movement, The intake port is positioned between the first engaging portion and the second engaging portion in a first direction parallel to the intake surface and a second direction parallel to the intake surface and perpendicular to the first direction. The first engaging portion and the second engaging portion engage with the auxiliary device so as to be movable relative to it in a third direction perpendicular to the first and second directions. The engagement portion is a groove whose length is oriented in the third direction, in a work machine system.

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