Impact tool, impact tool system, and dust collector

Abstract

To provide an impact device capable of facilitating battery attachment work.SOLUTION: An impact tool comprises: a tool holding part with a tip thereof attached with a tip tool extending in a longitudinal direction and configured to perform reciprocating motion in the longitudinal direction; a motor accommodation part extending downward from the tool holding part, and accommodating therein a motor for driving the tip tool in a posture where a rotary shaft crosses the longitudinal direction; and a battery attachment part that is disposed on a rear bottom surface which is located behind the motor accommodation part and oriented downward, and that is attached with a battery for supplying electric power to the motor. The motor accommodation part includes an inclined bottom surface, which extends protruding below the rear bottom surface from the motor accommodation part in front of the battery attachment part, and is inclined with respect to the longitudinal direction, and faces forward.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The technology disclosed herein relates to an impact tool, an impact tool system, and a dust collection device. [Background technology]

[0002] An impact tool strikes a workpiece by reciprocating a tool tip with a motor. For example, the following Patent Document 1 discloses a hammer drill, which is an example of an impact tool. Some impact tools, such as the hammer drill of Patent Document 1, are equipped with a battery that supplies power to the motor and a dust collector that sucks up dust generated during processing. In addition, the following Patent Document 2 discloses a dust collector that is attached to a power tool. Both of the dust collectors of Patent Documents 1 and 2 are attached from below the power tool and use the suction force generated by the power tool to collect dust. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-185909 A [Patent Document 2] U.S. Patent Publication No. 6,851,898 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, impact tools may be equipped with a battery or a dust collection device, and improvements have been made daily to facilitate the installation of these devices and to improve their ease of use and handling after installation.

[0005] An object of the technique of the present disclosure is to provide an impact device that can at least facilitate the installation of a battery. [Means for solving the problem]

[0006] One aspect of the present disclosure is an impact tool comprising: a tool holder extending in a front-rear direction and having a tool tip reciprocating in the front-rear direction attached to a tip thereof, a motor housing extending downward from the tool holder and housing a motor for driving the tool tip with a rotation axis intersecting the front-rear direction, and a battery mounting section located rearward of the motor housing section and provided on a rear bottom surface facing downward, the battery mounting section having a battery for supplying power to the motor mounted therein, the motor housing section extending downward from the rear bottom surface in front of the battery mounting section and having an inclined bottom surface inclined with respect to the front-rear direction and facing forward.

[0007] According to the impact tool of this aspect, when the inclined bottom surface is placed on a horizontal surface, the rear battery mounting portion is raised above the horizontal surface, making it easy to mount the battery. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a schematic side view of the impact tool. [Diagram 2] FIG. 2 is a schematic top view of the impact tool. [Diagram 3] 1 is a schematic perspective view of an impact tool as viewed obliquely from below; FIG. [Figure 4] FIG. 3 is a schematic cross-sectional view of the impact tool in the 4-4 cut shown in FIG. 2. [Diagram 5] 5 is a schematic diagram showing a process of mounting a battery to an impact tool. FIG. [Figure 6] 4 is a schematic perspective view of an airflow generating portion and a connecting portion. FIG. [Figure 7] FIG. 2 is a schematic exploded perspective view of an air flow generating portion and a connecting portion. [Figure 8] FIG. 2 is a schematic perspective view of the double fan as viewed from below. [Figure 9] FIG. 2 is a schematic perspective view of the baffle plate as viewed from above. [Figure 10] FIG. 2 is a schematic perspective view of the baffle plate as viewed from below. [Figure 11]5 is a schematic cross-sectional view showing an area in which an airflow generating portion and a connecting portion are formed, extracted from FIG. 4. [Figure 12] 12 is a schematic cross-sectional view of the fan housing chamber taken along line 12-12 of FIG. 11. [Figure 13] 13 is a schematic cross-sectional view of the fan housing chamber taken along line 13-13 in FIG. 11. [Figure 14] 14 is a schematic cross-sectional view of the fan housing chamber taken along line 14-14 in FIG. 11. [Figure 15] FIG. 4 is an explanatory diagram showing the flow of a first air flow. [Figure 16] FIG. 11 is an explanatory diagram showing the flow of a second air flow. [Figure 17] FIG. 2 is a schematic side view of the dust collecting device. [Figure 18] FIG. 2 is a schematic top view of the dust collecting device. [Figure 19] 19 is a schematic cross-sectional view of the dust collecting device taken along line 19-19 of FIG. 18. [Figure 20] FIG. 1 is a schematic side view showing an impact tool system. [Figure 21] FIG. 1 is a schematic top view showing an impact tool system. [Figure 22] 5 is a schematic diagram showing a process of attaching the dust collecting device to the impact tool. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In one or more embodiments of the present disclosure, the impact tool may be configured to be able to be placed on a horizontal surface with the inclined bottom surface as a support surface. According to the impact tool configured in this manner, the impact tool can be stably placed on a horizontal surface with the inclined bottom surface as a support surface without the user's support, which makes it easier to attach the battery.

[0010] In one or more embodiments of the present disclosure, the rotation shaft of the motor may be disposed at an angle that intersects obliquely with the front-rear direction. With this configuration of the impact tool, the height of the housing can be configured to be smaller than when the rotation shaft of the motor is disposed at an angle perpendicular to the front-rear direction. This allows the impact tool to be made smaller and easier to handle.

[0011] In one or more embodiments of the technique disclosed herein, the inclined bottom surface may be configured to be perpendicular to the axial direction of the rotating shaft. With an impact tool configured in this manner, it is possible to prevent dead space from being formed around the lower end of the rotating shaft of the motor. This can improve the space efficiency within the housing of the impact tool, and reduce the size of the impact tool.

[0012] In one or more embodiments of the present disclosure, the inclined bottom surface may be provided with a connection part to which a dust collector that is attached to the impact tool so as to be integrated with the impact tool and that sucks up dust generated when the tool tip processes a workpiece may be connected. With this configuration of the impact tool, when the impact tool is in a horizontal position in the front-to-rear direction, a gap for arranging a connection part on the dust collector side can be created under the inclined bottom surface. This makes it possible to suppress an increase in the height dimension when the impact tool is integrated with the dust collector.

[0013] In one or more embodiments of the present disclosure, the dust collector is configured to collect the dust by a suction force generated by the impact tool, a fan that generates the suction force is connected to the rotating shaft of the motor, and the connection part may have a connection flow path that draws air from the dust collector by the suction force generated by the fan. With the impact tool configured in this way, the distance between the fan that generates the suction force for dust collection and the connection flow path can be shortened. Therefore, the suction force generated by the impact tool can be efficiently transmitted to the dust collector, thereby improving the suction performance of the dust collector.

[0014] One or more embodiments of the present disclosure are provided as an impact tool system including the impact tool and the dust collecting device. In this impact tool system, the impact tool and the dust collecting device may be configured to be integrally connected by sliding them toward each other in a direction perpendicular to the inclined bottom surface. According to the impact tool system configured in this manner, it is possible to more easily attach the dust collecting device to the impact tool. In addition, when a seal member is disposed around the connection portion, it is possible to suppress unevenness in the sealing pressure of the seal member.

[0015] One or more embodiments of the present disclosure are provided as an impact tool system including the dust collecting device. The impact tool system may be configured so that, when the dust collecting device is attached to the impact tool, the impact tool can be placed on a horizontal surface with a bottom surface of the dust collecting device as a support surface. According to the impact tool system configured as described above, the impact tool can be placed on a horizontal surface in a stable position when the dust collecting device is attached to the impact tool, thereby improving the usability of the impact tool system.

[0016] In one or more embodiments of the present disclosure, the impact tool system may be configured to be able to be placed on a horizontal surface while being supported by a bottom surface of the dust collector when the battery and the dust collector are attached to the impact tool. According to the impact tool system configured in this manner, the impact tool can be placed on a horizontal surface in a stable position when the battery and the dust collector are attached to the impact tool, thereby further improving the usability of the impact tool system.

[0017] One or more embodiments of the present disclosure are provided as a dust collecting device that is attached to the impact tool so as to be integrated therewith and that sucks up dust generated when the tip tool processes a workpiece. The dust collecting device may include a bottom surface portion that is configured to be placed on a horizontal surface, an inclined surface that is inclined with respect to the bottom surface portion and faces the inclined bottom surface when attached to the impact tool, and a dust collecting device side connecting portion that is provided on the inclined surface and connected to the connecting portion of the impact tool. The dust collecting device configured in this manner can suppress an increase in the overall height when attached to the impact tool.

[0018] Representative and non-limiting embodiments of the present disclosure will be specifically described below with reference to the drawings.

[0019] 1. Implementation: 1-1.Outline of impact tool: First, a schematic configuration of an impact tool 10 according to the present embodiment will be described with reference to Fig. 1 to Fig. 4. In Fig. 1, a tool tip TT is illustrated by a dashed line for the sake of convenience. Fig. 1 also illustrates a state in which an example of a battery BT is attached to the impact tool 10, but Figs. 3 and 4 omit the illustration of the battery BT.

[0020] 1 to 4, arrows indicating the "front-rear direction", "up-down direction", and "left-right direction" are shown, which are directions related to the impact tool 10 defined for the convenience of explanation in this specification. The "front-rear direction" corresponds to the direction in which the tool tip TT of the impact tool 10 is reciprocated. The direction in which the tool tip TT protrudes is the "forward direction", and the direction in which it is pulled back is the "rear direction". The front-rear direction corresponds to the length direction of the impact tool 10. The "up-down direction" is a direction perpendicular to the front-rear direction, and the side where the tool tip TT is located is the "upper side", and the side where the motor 32 is located is the "lower side". The up-down direction corresponds to the height direction of the impact tool 10. The "left-right direction" is a direction perpendicular to the front-rear direction and the up-down direction, and corresponds to the width direction of the impact tool 10. Arrows indicating the front-rear direction, the up-down direction, and the left-right direction are also shown appropriately in each figure referred to later in this specification.

[0021] The impact tool 10 shown in Figs. 1 to 4 is a type of hand-held power tool, and the driving force of a motor 32 is used to reciprocate the tool tip TT to strike a workpiece (not shown). The impact tool 10 of this embodiment is a so-called hammer drill, and the tool tip TT can also be rotated about its central axis. In addition, although details will be described later, the impact tool 10 of this embodiment is equipped with a dust collector 100 that sucks in dust generated when the tool tip TT processes a workpiece, thereby forming an impact tool system 200. The configurations of the dust collector 100 and the impact tool system 200 will be described after the configuration of the impact tool 10 has been described.

[0022] 1 and 4, the impact tool 10 includes a housing 11 having an internal space for accommodating internal mechanical elements. The housing 11 constitutes an outer shell of each component of the impact tool 10, which will be described below.

[0023] Referring to Fig. 1, the impact tool 10 includes a front body portion 20 to which a tool tip TT is attached and which houses a drive unit 50 for driving the tool tip TT, and a rear body portion 40 which is connected to the rear end portion of the front body portion 20. A battery BT is attached to the lower end of the rear body portion 40.

[0024] First, a description will be given of the front body part 20. The front body part 20 is located at the upper end of the impact tool 10 and has a tool holding part 21 extending in the front-rear direction, and a motor accommodating part 30 extending downward from the rear end side of the tool holding part 21.

[0025] A tool mounting section 22 is provided at the tip of the tool holding section 21 to which a tool tip TT, also called a bit, is removably mounted. Various types of tool tip TT are available according to the contents of the processing work, and can be replaced as appropriate. As shown in FIG. 4, a drive mechanism 51 for driving the tool tip TT is accommodated inside the tool holding section 21. The drive mechanism 51 will be described later.

[0026] Please refer to Fig. 2. The upper surface of the housing 11 constituting the tool holding portion 21 is provided with an upper surface intake port 23 for taking in outside air for cooling the motor 32. The configuration for cooling the motor 32 will be described later.

[0027] A side handle 24 to be gripped by a user is provided so as to protrude from the side surface of the tool holding part 21. The attachment position of the side handle 24 is configured to be variable around the drive shaft of the tool tip TT. The side handle 24 is also configured to be detachable.

[0028] A dial operation unit 25 for switching the drive mode of the impact tool 10 is provided on the side of the tool holding unit 21. The drive modes include, for example, a hammer mode in which the tool tip TT is only reciprocated, a hammer drill mode in which the tool tip TT is reciprocated while being rotationally driven, and a drill mode in which the tool tip TT is only rotationally driven.

[0029] Please refer to Fig. 4. As described above, the motor accommodating section 30 accommodates the motor 32 that generates a rotational driving force for driving the tool bit TT. The motor 32 has a rotating shaft 32x that rotates, a rotor 32r that is integrally attached to the rotating shaft 32x, and a stator 32s that is provided on the outer periphery of the rotor 32r.

[0030] The rotating shaft 32x is disposed in a position intersecting the front-rear direction. In this embodiment, the rotating shaft 32x is disposed in a position intersecting the front-rear direction at an angle. This allows the height of the housing 11 constituting the motor accommodating portion 30 to be smaller than in a configuration in which the rotating shaft 32x of the motor 32 is disposed at an angle perpendicular to the front-rear direction, and the impact tool 10 can be made smaller in size.

[0031] A first end 33a, which is an upper end of the rotating shaft 32x, is connected to the drive mechanism 51, and a second end 33b, which is a lower end, is connected to fans 75a, 75b. The motor accommodating section 30 is provided with an airflow generating section 70 that generates an airflow in the housing 11 by the fans 75a, 75b. A detailed configuration of the airflow generating section 70 will be described later.

[0032] The motor accommodating portion 30 forms the bottom surface of the rear main body portion 40 and has a lower end portion 35 extending beyond a rear bottom surface 47 located at the rear of the motor accommodating portion 30. The lower end portion 35 is the lowest portion of the impact tool 10. Most of the air flow generating portion 70 is accommodated in the lower end portion 35. The lower end portion 35 has an inclined bottom surface 36 that is inclined with respect to the front-rear direction and faces forward.

[0033] 3, in this embodiment, a connection part 90 to which the dust collecting device 100 is connected is provided on the inclined bottom surface 36. The configuration of the connection part 90 will be described later together with the configuration of the air flow generating part 70.

[0034] In this embodiment, the inclination angle θ of the inclined bottom surface 36 with respect to the front-rear direction is preferably 10° or more and 45° or less. The inclination angle θ is more preferably 30° or less. The inclination angle θ may be about 15°. The reason why the inclined bottom surface 36 is inclined will be described later.

[0035] Next, the rear main body part 40 will be described with reference to Fig. 1. The rear main body part 40 has a grip part 41 for a user to grip, and a controller storage part 42 provided below the grip part 41.

[0036] The rear main body 40 is connected to the rear end of the tool holding part 21 at the upper end of the grip part 41, and is connected to the rear end of the motor housing part 30 at the front end of the controller housing part 42. A space is formed between the grip part 41 and the tool holding part 21 for the user to insert his / her fingers.

[0037] Please refer to Fig. 4. The rear main body part 40 is connected to the front main body part 20 in a state where it is allowed to rotate slightly around a rotation shaft 43 provided at the rear lower end of the motor housing part 30 as a fulcrum. Also, an elastic member 44 is housed in the connection part between the grip part 41 and the tool holding part 21. Although a detailed description will be omitted, the impact tool 10 is configured so that vibrations generated in the tool holding part 21 during processing work are absorbed by the elastic member 44 and an elastic body arranged around the rotation shaft 43, and vibrations transmitted to the grip part 41 are mitigated.

[0038] Please refer to Figures 1 and 4. A trigger 45 for turning on / off the drive of the motor 32 is provided on the front side surface of the grip part 41. A switch circuit 45c is disposed behind the trigger 45. In response to the operation of the trigger 45, the switch circuit 45c outputs a signal indicating a command to turn on / off the drive of the motor 32 to the control part 46.

[0039] Please refer to FIG. 4. The control unit 46 is accommodated in the controller housing 42. The control unit 46 is configured by a microcomputer including at least a central processing unit (CPU) and a main memory device (RAM). The control unit 46 has various functions for controlling the operation of the entire impact tool 10. For example, the control unit 46 controls the driving of the motor 32 by controlling the power supplied from the battery BT to the motor 32 based on the operation by the user or the detection results of other sensors. The control unit 46 controls the start and stop of the driving of the motor 32 based on a signal from the above-mentioned switch circuit 45c in response to the operation of the trigger 45 operated by the user. The control unit 46 also controls the rotation speed of the motor 32 in response to the operation of the push button type speed change switch 26 for commanding acceleration / deceleration, which is provided on the front upper surface of the controller housing 42.

[0040] 1 and 3. A battery mounting section 48 for mounting a battery BT, which is a power source for the impact tool 10, is provided on a rear bottom surface 47, which is the bottom surface of the rear main body section 40 and the controller housing section 42. A step section 47s is formed between the rear bottom surface 47 and the inclined bottom surface 36 of the front main body section 20 described above. The battery BT is disposed in an area facing the rear bottom surface 47 and the step section 47s.

[0041] Please refer to Fig. 3. Battery mounting section 48 has a connection terminal 48t that electrically connects to a terminal provided on the upper surface of battery BT, and an engagement section 48e that engages with an engaged section provided on the upper surface of battery BT to hold battery BT. Battery BT has a substantially rectangular shape, and has a connected section on its upper surface that corresponds to battery mounting section 48. Various types of batteries BT with different external dimensions and charging capacities can be mounted in battery mounting section 48.

[0042] In this embodiment, the battery mounting section 48 is configured so that the battery BT is mounted by sliding the battery BT forward toward the lower end 35 of the motor housing section 30. The engagement section 48e includes a pair of guide rails 48r that extend in the front-rear direction and are arranged in parallel in the left-right direction. The pair of guide rails 48r engage with a pair of linear grooves provided as engaged sections on the upper surface of the battery BT.

[0043] Furthermore, a latch mechanism that automatically fixes the battery BT when the battery BT reaches a predetermined mounting position is provided in the battery mounting section 48. Since the latch mechanism is a known technique, a detailed description thereof will be omitted.

[0044] 1-2. Slanted bottom: Please refer to Fig. 5. Fig. 5 illustrates a state in which the impact tool 10 is placed on a horizontal surface HP with the inclined bottom surface 36 as a support surface. When the impact tool 10 is placed on the horizontal surface HP with the inclined bottom surface 36 as a support surface, the rear main body part 40 is in a state of being lifted upward, which facilitates attachment of the battery BT to the battery attachment part 48 on the rear bottom surface 47 of the rear main body part 40. If the battery BT is attached to the battery attachment part 48 by sliding it in the front-rear direction as in this embodiment, the attachment work of the battery BT is further facilitated.

[0045] In this embodiment, the impact tool 10 is configured so that it can be stably placed on a horizontal plane HP with the inclined bottom surface 36 as a support surface when the tool tip TT and the battery BT are not attached, for example, by adjusting the area and center of gravity of the inclined bottom surface 36. It is preferable that the impact tool 10 is configured so that it can be stably placed on a horizontal plane with the inclined bottom surface 36 as a support surface even when the tool tip TT is attached but the battery BT is not attached.

[0046] According to this configuration, the impact tool 10 can be stably placed on the horizontal surface HP using the inclined bottom surface 36 as a support surface without the user having to support it, which makes it easier to attach the battery BT. In addition, when the impact tool 10 is placed on the horizontal surface HP, the grip portion 41 is lifted obliquely upward, so that the user can easily hold the grip portion 41 and lift the impact tool 10 placed on the horizontal surface HP. This improves the maneuverability and usability of the impact tool 10.

[0047] Please refer to Fig. 1. The impact tool 10 is preferably configured so that it can be stably placed on the horizontal surface HP with the battery BT attached. In this configuration, when the height of the battery BT is equal to or less than the height of the step portion 47s between the rear bottom surface 47 and the inclined bottom surface 36, the impact tool 10 is placed in a stable position on the horizontal surface HP with the inclined bottom surface 36 as a support surface. When the height of the battery BT is greater than the height of the step portion 47s between the rear bottom surface 47 and the inclined bottom surface 36, the impact tool 10 is supported by the front end of the inclined bottom surface 36 and the front end of the battery BT and placed in a stable position on the horizontal surface HP.

[0048] According to this configuration, a user can easily place the impact tool 10 on the horizontal surface HP during work using the impact tool 10. Furthermore, when resuming use of the impact tool 10, the user can easily lift the impact tool 10 by gripping the gripping portion 41 that is lifted obliquely upward from the horizontal surface. This improves the maneuverability and usability of the impact tool 10.

[0049] Please refer to Fig. 4. In this embodiment, the inclined bottom surface 36 is perpendicular to the axial direction of the rotation shaft 32x of the motor 32. This configuration prevents dead space from being generated in the area of ​​the housing 11 around the second end 33b of the rotation shaft 32x. This improves the spatial efficiency of the housing 11 of the impact tool 10, and allows the impact tool 10 to be made smaller.

[0050] As described above, the inclined bottom surface 36 is provided with the connection portion 90 for connecting to the dust collector 100. With this configuration, when the impact tool 10 is in a position in which the front-rear direction is horizontal, a gap for arranging the dust collector side connection portion 142 described later can be generated below the inclined bottom surface 36. Therefore, an increase in the height dimension when integrated with the dust collector 100 can be suppressed.

[0051] 1-3.Drive unit: With reference to FIG. 4, a drive unit 50 for driving the tool tip TT, which is housed in the front main body portion 20, will be described.

[0052] The drive unit 50 includes the motor 32 described above, and a drive mechanism 51 that drives the tool tip TT with a drive force generated by the motor 32. The drive mechanism 51 includes a drive force transmission mechanism 52 that is connected to the rotation shaft 32x of the motor 32, and a tool drive mechanism 60 that mediates the connection between the drive force transmission mechanism 52 and the tool tip TT and generates a motion of the tool tip TT.

[0053] In the hammer mode and the hammer drill mode, the driving force transmission mechanism 52 has a function of converting the rotational motion of the rotation shaft 32x of the motor 32 into linear motion in the forward / rearward direction and transmitting the linear motion to the tool driving mechanism 60. In the present embodiment, the driving force transmission mechanism 52 also has a function of transmitting the rotational motion of the rotation shaft 32x of the motor 32 to the tool driving mechanism 60 as the rotational motion in the hammer drill mode and the drill mode.

[0054] The impact tool 10 is provided with a mechanism for blocking the transmission of linear motion or rotational motion from the driving force transmission mechanism 52 to the tool driving mechanism 60 in response to a drive mode switching operation performed by the dial operation unit 25. This mechanism is a known technique, and therefore a detailed description thereof will be omitted.

[0055] The driving force transmission mechanism 52 has an intermediate rotating shaft 53 that is held parallel to the front-rear direction in a state where it can rotate around a central axis, and a bevel gear 54 that is connected to the rear end of the intermediate rotating shaft 53. A first end 33a of a rotating shaft 32x of the motor 32 is connected to the rear end of the intermediate rotating shaft 53 via the bevel gear 54. As a result, the intermediate rotating shaft 53 rotates due to the rotation of the rotating shaft 32x of the motor 32.

[0056] The driving force transmission mechanism 52 further includes a swing member 55 for converting the rotational motion of the intermediate rotating shaft 53 into reciprocating motion in the forward and backward directions, and a reducer 56 for transmitting the rotational motion of the intermediate rotating shaft 53 to the tool driving mechanism 60.

[0057] The swing member 55 is composed of a mechanical element also called a swash bearing. The swing member 55 has a base end 55a attached to the middle part of the intermediate rotating shaft 53 so as to surround the shaft, and a swing lever 55b connected to the base end 55a via a bearing in a position that crosses the intermediate rotating shaft 53 obliquely. When the intermediate rotating shaft 53 rotates, the swing lever 55b of the swing member 55 swings in the front-rear direction with the base end 55a as a fulcrum. The swing lever 55b is connected to a piston cylinder 62 of the tool driving mechanism 60. The swing of the swing lever 55b causes the piston cylinder 62 to reciprocate in the front-rear direction.

[0058] The reducer 56 is connected to the intermediate rotating shaft 53 on the front side of the swinging member 55. The reducer 56 is composed of a plurality of gears, and transmits the rotational motion of the intermediate rotating shaft 53 to a tool holding member 61 of the tool driving mechanism 60 via the plurality of gears.

[0059] The tool driving mechanism 60 includes a tool holding member 61. The tool holding member 61 is configured of a substantially cylindrical member with the longitudinal direction being the front-rear direction. The tool holding member 61 is held inside the tool holding section 21 in a state in which it can rotate about its central axis. The front end of the tool holding member 61 constitutes the above-mentioned tool mounting section 22. The tool tip TT mounted on the tool mounting section 22 is fixed to the tool holding member 61 so as to reciprocate or rotate together with the tool holding member 61.

[0060] The tool driving mechanism 60 further includes a piston cylinder 62, a striker 64, and an impact bolt 65 as mechanical elements for generating the reciprocating motion of the tool tip TT.

[0061] The piston cylinder 62 is disposed behind the tool holding member 61, and is configured from a generally cylindrical member with a longitudinal direction being the front-rear direction and a generally constant inner diameter along the longitudinal direction. The rear end of the piston cylinder 62 is closed, and the front end is open. The rear end of the piston cylinder 62 is connected to the above-mentioned swing lever 55b. The piston cylinder 62 reciprocates in the front-rear direction in association with the swing of the swing lever 55b in the front-rear direction.

[0062] A striker 64 is housed inside the piston cylinder 62. The striker 64 has a cylindrical rear end portion with a large diameter and a cylindrical front end portion with a small diameter. The rear end portion of the striker 64 is airtightly fitted into the piston cylinder 62, and an air chamber 63 that functions as an air spring is formed between the rear end portion of the striker 64 and the rear end of the piston cylinder 62. The striker 64 reciprocates in the front-rear direction together with the piston cylinder 62 due to the action of the air pressure in the air chamber 63.

[0063] An impact bolt 65 is disposed in front of the striker 64. The impact bolt 65 is configured from a cylindrical member whose longitudinal direction is the front-rear direction, and its rear end is disposed in a position within the piston cylinder 62 where it can come into contact with a front portion of the striker 64. A portion of the impact bolt 65 forward of its rear end is inserted into the tube of the tool holding member 61, and is connected to and held by the tool holding member 61.

[0064] In the impact tool 10, the reciprocating motion of the tool tip TT during a machining operation in the hammer mode or hammer drill mode occurs as follows. When the piston cylinder 62 moves forward due to the swinging motion of the swinging member 55, the striker 64 receives pressure from the air chamber 63 and moves together with the piston cylinder 62. As a result, the striker 64 comes into contact with the rear end of the impact bolt 65 and applies an impact force to the impact bolt 65. The impact force applied to the impact bolt 65 is transmitted to the tool tip TT, and the tool tip TT moves so as to protrude forward.

[0065] While the workpiece is being machined by the impact tool 10, the tool tip TT is pressed against the workpiece. Therefore, when the striker 64 moves rearward together with the piston cylinder 62 due to the negative pressure in the air chamber 63, the tool tip TT is pushed back rearward. During the machining operation of the workpiece, such protrusion and push-back of the tool tip TT is repeated.

[0066] A strike prevention mechanism that prevents the striker 64 from reciprocating when the tool tip TT is not pressed against the workpiece and is in a no-load state is provided inside the tool holding member 61. The strike prevention mechanism can be realized by a known technique, and therefore a detailed description thereof will be omitted in this specification.

[0067] In the impact tool 10, during a processing operation in the drill mode or the hammer drill mode, the rotational motion of the rotation shaft 32x of the motor 32 is transmitted to the tool holding member 61 via the reducer 56 of the driving force transmission mechanism 52, causing the tool holding member 61 to rotate. The tool tip TT rotates together with the tool holding member 61.

[0068] 1-4.Air flow generating section and connection section: The configurations of the airflow generating portion 70 and the connection portion 90 provided at the lower end of the motor accommodating portion 30 will be described with reference to FIGS. 3, 4, and 6 to 14 as appropriate.

[0069] Please refer to Figures 6 and 7. Figure 6 shows the airflow generating unit 70 and the connection unit 90 formed at the lower end of the motor accommodating unit 30, with the right-side housing 11 omitted. Figure 7 shows the components of the airflow generating unit 70 and the connection unit 90 disassembled and arranged in the axial direction of the rotation shaft 32x of the motor 32. Note that in Figure 7, like Figure 6, the right-side housing 11 is omitted.

[0070] The airflow generating section 70 includes a fan accommodating chamber 71, a double fan 75w, and a baffle plate 80. The fan accommodating chamber 71 is defined below an area in the motor accommodating section 30 where the motor 32 is disposed by an inner wall section 11w provided in the housing 11. An inlet opening 72 is provided in an upper end wall section of the fan accommodating chamber 71. The rotating shaft 32x of the motor 32 is inserted into the inlet opening 72. As will be described later, the inlet opening 72 functions as a flow path for introducing air into the fan accommodating chamber 71.

[0071] The lower end wall of the fan accommodating chamber 71 is formed by the lower end wall of the housing 11 having the inclined bottom surface 36. The lower end wall is provided with a bottom opening 73 in which a connection portion 90 to which the dust collecting device 100 is connected is formed. As shown in Fig. 3 and Fig. 7, in this embodiment, the bottom opening 73 is formed by a substantially circular through hole having a virtual axis rx that is an axial extension of the rotation shaft 32x of the motor 32 as its central axis.

[0072] As shown in FIG. 3, the lower end of the fan accommodating chamber 71 is provided with a first exhaust port 74a, a second exhaust port 74b, and a third exhaust port 74c, which penetrate the housing 11 and communicate with the outside. The first exhaust port 74a is provided at each of the left and right corners of the lower end of the motor accommodating section 30. The second exhaust port 74b is provided behind the bottom opening 73. The second exhaust port 74b is provided at a position sandwiched between the left and right first exhaust ports 74a. The third exhaust port 74c opens in the left and right side wall portions of the lower end of the motor accommodating section 30. The third exhaust port 74c is provided on the front side of each of the left and right first exhaust ports 74a.

[0073] 6 and 7, the fan housing chamber 71 houses a double fan 75w and a baffle plate 80. The fan housing chamber 71 also houses a cap member 91, a shutter member 94, and a biasing member 95, which form a connection part 90 on the bottom surface of the fan housing chamber 71.

[0074] The configuration of the double fan 75w will be described with reference to Figures 6, 7, 8, 11, 12, and 13. The double fan 75w is an integrated component in which a first fan 75a and a second fan 75b are stacked vertically. As described above, each of the fans 75a and 75b is connected to the second end 33b of the rotating shaft 32x of the motor 32. Each of the fans 75a and 75b is configured to rotate around the axis of the rotating shaft 32x by being driven by the motor 32, and to blow air in a centrifugal direction.

[0075] As shown in Fig. 6, the center of the first fan 75a disposed on the upper side is connected to the second end 33b of the rotation shaft 32x of the motor 32. Also, as shown in Fig. 6 and Fig. 11, the second fan 75b disposed on the lower side is stacked in the axial direction of the rotation shaft 32x of the motor 32 with a disk-shaped intermediate wall portion 78M interposed therebetween at a position where the central axis coincides with that of the first fan 75a. The first fan 75a and the second fan 75b are connected to each other via the intermediate wall portion 78M, and the second fan 75b rotates together with the first fan 75a.

[0076] In this embodiment, the first fan 75a and the second fan 75b have different configurations. In this specification, "different fan configurations" means that the fans have different configurations that generate airflows with different wind speeds, air volumes, or air pressures at the same rotation speed, or that the methods of sucking in and sending out air are different. Examples of differences in the fan configurations include the shape, number, and dimensions of the fins.

[0077] In this embodiment, the first fan 75a and the second fan 75b have different methods of sucking in and sending out air. The first fan 75a sucks in air by generating negative pressure on the axial upstream side of the rotating fins and sends it out in the centrifugal direction. On the other hand, the second fan 75b sucks in air by generating negative pressure in a central area surrounded by the rotating fins and sends it out in the centrifugal direction. The first fan 75a and the second fan 75b send out air in the centrifugal direction by different configurations as follows.

[0078] The first fan 75a is configured to rotate by the rotation drive of the motor 32 and to send out air sucked from the motor 32 side in a centrifugal direction. As shown in Figs. 6 and 7, a plurality of fins 76a constituting the first fan 75a are provided on the upper surface of the intermediate wall portion 78M on the motor 32 side. The upper surface of the intermediate wall portion 78M has a tapered shape that slopes downward from the center side toward the outside in the radial direction. As shown in Fig. 12, the plurality of fins 76a of the first fan 75a are arranged at equal intervals radially around the rotation shaft 32x of the motor 32 when viewed in the central axial direction of the first fan 75a, and each fin 76a extends linearly in the radial direction.

[0079] The second fan 75b is configured to rotate by the rotation drive of the motor 32 and send out the air sucked from the lower connection part 90 in the centrifugal direction. As shown in FIG. 8, the second fan 75b has an air intake port 77 provided in the center, a plurality of fins 76b extending radially from the intake port 77, and an annular lower wall part 78L surrounding the intake port 77. As shown in FIG. 11, the lower wall part 78L has a shape that is inclined downward from the center side toward the radially outward side. The plurality of fins 76b constituting the second fan 75b are connected to the lower surface of the intermediate wall part 78M and the upper surface of the lower wall part 78L. As shown in FIG. 13, the plurality of fins 76b of the second fan 75b are curved to the same extent when viewed in the central axis direction of the second fan 75b, and are arranged radially at equal intervals around the intake port 77.

[0080] 7, an annular overhanging portion 78e is provided on the outer circumferential edge of intermediate wall portion 78M between first fan 75a and second fan 75b. Overhanging portion 78e extends in the centrifugal direction beyond the outer circumferential ends of fins 76a of first fan 75a and fins 76b of second fan 75b. The function of overhanging portion 78e will be described later.

[0081] The configuration of the baffle plate 80 will be described mainly with reference to FIGS. 6, 7, 9, 10, and 11.

[0082] 6 and 11, the baffle plate 80 is disposed so as to be stacked on a position opposite to the first fan 75a with respect to the second fan 75b. The baffle plate 80 rectifies the air sent out in the centrifugal direction by the second fan 75b.

[0083] 7, 9, and 10, the baffle plate 80 has a plate-shaped central plate portion 81 that intersects with the central axis of the second fan 75b and is disposed along the centrifugal direction of the second fan 75b, and a side wall portion 82 formed on a part of the outer periphery of the central plate portion 81. In this embodiment, the central plate portion 81 has a disk-like shape. A central opening portion 83 that is connected to the intake port 77 of the second fan 75b is provided in the center of the central plate portion 81.

[0084] As shown in Fig. 9, a plurality of concentric convex ribs 84 are formed on the upper surface of the central plate portion 81 facing the second fan 75b so as to surround the central opening 83. The plurality of convex ribs 84 form a labyrinth seal between the lower wall portion 78L of the second fan 75b. As shown in Fig. 10, a cylindrical portion 85 is provided on the lower surface of the central plate portion 81 on the side opposite to the second fan 75b, surrounding the central opening 83 and protruding toward the bottom opening 73 that constitutes the connection portion 90.

[0085] As shown in FIG. 9 and FIG. 10, the central plate portion 81 has a first portion 81a and a second portion 81b around the central opening 83. The first portion 81a is a continuous portion whose end is located outside the end of the second fan 75b in the centrifugal direction of the second fan 75b. In this embodiment, the first portion 81a is a portion having a radius larger than the radius of the second fan 75b. The second portion 81b is a portion whose end is located closer to the center of the second fan 75b than the end of the first portion 81a. In this embodiment, the second portion 81b is a portion whose end is located radially inward from the end of the first portion 81a. In this embodiment, the second portion 81b is configured as a portion having a radius smaller than the radius of the first portion 81. As shown in FIG. 11, in this embodiment, the radius of the second portion 81b is approximately the same as the radius of the second fan 75b. The second portion 81b may be formed, for example, in a range of about ¼ of the circumference of the central plate portion 81. As described later, the second portion 81b functions as a portion that rectifies the second airflow sent out in the centrifugal direction by the second fan 75b so as to turn back toward the lower side of the central plate portion 81. Note that in other embodiments, the outer peripheral end portion of the second portion 81b does not need to be configured in an arc shape, and may be configured, for example, as a portion in which a part of the arc that configures the outer peripheral edge portion of the central plate portion 81 is cut out.

[0086] As shown in FIG. 6, the side wall portion 82 extends in the axial direction of the rotating shaft 32x of the motor 32 on the side of the second fan. As shown in FIG. 6 and FIG. 11, the upper end of the side wall portion 82 extends from the central plate portion 81 to a region on the side of the second fan 75b. The upper end of the side wall portion 82 extends to the vicinity of the outer peripheral end of the eaves portion 78e of the intermediate wall portion 78M. Also, as shown in FIG. 11, the lower end of the side wall portion 82 extends to the lower end wall portion of the fan accommodating chamber 71. As shown in FIG. 9 and FIG. 10, the side wall portion 82 is formed on the opposite side in the centrifugal direction of the second fan 75b with respect to the above-mentioned second portion 81b of the central plate portion 1, with the central axis of the second fan 75b in between. In this embodiment, the side wall portion 82 is formed on the opposite side in the radial direction with the center of the central plate portion 81 in between. The side wall portion 82 may be formed, for example, in a range of about ¼ of the circumference of the central plate portion 81. The function of the side wall portion 82 will be described later.

[0087] As shown in FIG. 12, the second exhaust port 74b provided at the lower end of the fan housing chamber 71 is formed at a position facing the baffle plate 80. As shown in FIG. 10, a plurality of parallel ribs 86 are formed on the surface of the central plate portion 81 of the baffle plate 80 facing downward on the second exhaust port 74b side. Each rib 86 is formed so as to extend in the front-rear direction behind the cylindrical portion 85. In addition, the rear end of each rib 86 is connected to the side wall portion 82. As shown in FIG. 3, the second exhaust port 74b is divided into a plurality of regions by the plurality of ribs 86 of the baffle plate 80. Note that, in another embodiment, only one rib 86 may be formed on the baffle plate 80. Even if there is only one rib 86, the second exhaust port 74b can be divided into two regions.

[0088] 7 and 11, the cap member 91, the shutter member 94, the biasing member 95, and the connection portion 90 formed by these members will be described.

[0089] As shown in Fig. 7, the cap member 91 has a cylindrical outer peripheral cylindrical portion 92c on the outer peripheral edge, and an annular bottom wall portion 92w connected to the inside of the lower end of the outer peripheral cylindrical portion 92c. A substantially circular connection opening 93 is provided in the center of the bottom wall portion 92w. As shown in Fig. 11, the cap member 91 is fixed to the cylindrical portion 85 of the baffle plate 80 by fitting the outer peripheral cylindrical portion 92c to the lower end of the cylindrical portion 85 of the baffle plate 80. The cap member 91 is fitted into the bottom opening 73 with the outer peripheral edge of the bottom wall portion 92w in airtight contact with the inner peripheral edge of the bottom opening 73.

[0090] As shown in Fig. 7, the shutter member 94 is formed of a disk-shaped member having a diameter smaller than the inner diameter of the cap member 91 and the inner diameter of the cylindrical portion 85 of the baffle plate 80. On the upper surface of the shutter member 94, a substantially cross-shaped reinforcing rib 94r is formed which intersects at right angles at the center of the shutter member 94. As shown in Fig. 11, the shutter member 94 is disposed within the cylindrical portion 85 of the baffle plate 80 so as to air-tightly close the connection opening 93 at the center of the cap member 91.

[0091] 7 and 11, the biasing member 95 is formed of a coil spring having approximately the same diameter as the shutter member 94. As shown in Fig. 11, the biasing member 95 is housed in the cylindrical portion 85 of the baffle plate 80 together with the shutter member 94, and biases the outer circumferential edge portion of the shutter member 94 against the cap member 91 at the lower end side with the upper end side supported by the central plate portion 81 of the baffle plate 80.

[0092] Please refer to FIG. 11. Before the dust collector 100 is connected, the connection part 90 is in a state where the connection opening 93 of the cap member 91 is airtightly closed by the shutter member 94. When the dust collector 100 is connected to the connection part 90, the shutter member 94 is pushed upward by a pin 144 (FIG. 19) of a dust collector side connection part 142 of the dust collector 100 (described later) against the biasing force of a biasing member 95. This opens the connection opening 93 of the cap member 91, and allows air to flow between the dust collector 100 and the cap member 91. The connection opening 93 of the cap member 91 functions as a connection flow path 96 for sucking air from the dust collector 100.

[0093] In this manner, if the connection passage 96 is provided in the connection portion 90 provided on the inclined bottom surface 36 below the motor 32, the distance between the second fan 75b and the connection passage 96 can be shortened. Therefore, the suction force generated by the impact tool 10 can be efficiently transmitted to the dust collecting device 100, thereby improving the suction performance of the dust collecting device 100.

[0094] The compartments within the fan housing chamber 71 will be described with reference to FIGS.

[0095] 11, the fan housing chamber 71 is partitioned by an intermediate wall portion 78M into a first fan chamber 71a housing the first fan 75a and a second fan chamber 71b housing the second fan 75b. The fan housing chamber 71 is also partitioned by a central plate portion 81 of a baffle plate 80 into the second fan chamber 71b and an exhaust chamber 71c below the second fan chamber 71b.

[0096] Please refer to FIG. 14. A first exhaust port 74a, a second exhaust port 74b, and a third exhaust port 74c are open in the exhaust chamber 71c. The first exhaust port 74a is provided at each of the corners on both the left and right sides of the rear end of the exhaust chamber 71c. The second exhaust port 74b is provided between the left and right first exhaust ports 74a. The second exhaust port 74b is divided into a plurality of regions by a plurality of ribs 86 provided on the baffle plate 80 described above. The third exhaust port 74c is open in the left and right direction in front of each of the left and right first exhaust ports.

[0097] The exhaust chamber 71c is divided by the side wall portion 82 of the baffle plate 80 into a first exhaust area 71cA that communicates with the outside of the housing 11 through the first exhaust port 74a, and a second exhaust area 71cB that communicates with the outside of the housing 11 through the second exhaust port 74b and the third exhaust port 74c. A cylindrical portion 85 of the baffle plate 80 that communicates with the connection flow path 96 of the connection portion 90 passes through the center of the second exhaust area 71cB.

[0098] See Fig. 12. The first fan chamber 71a communicates with the first exhaust area 71cA of the exhaust chamber 71c described above at two corners in the left and right direction of the rear end. See Fig. 13. The second fan chamber 71b is partitioned by the side wall portion 82 of the baffle plate 80, thereby blocking communication with the first exhaust area 71cA.

[0099] In the second fan chamber 71b, the second portion 81b having a smaller radius of the central plate portion 81 of the baffle plate 80 is spaced from the inner wall surface of the housing 11. As a result, the second fan chamber 71b communicates with the second exhaust region 71cB of the exhaust chamber 71c through the gap between the second portion 81b and the inner wall surface of the housing 11. The first portion 81a of the central plate portion 81 of the baffle plate 80 is in contact with the inner wall surface of the housing 11 so as to separate the second fan chamber 71b and the exhaust chamber 71c.

[0100] 1-5. First air flow and second air flow: The first air flow Fa generated by the first fan 75a will be described with reference to Figures 4 and 15. Figures 4 and 15 show arrows indicating the flow of the first air flow Fa.

[0101] First, refer to Fig. 15. When the first fan 75a is driven, air is sent out from the first fan 75a in the centrifugal direction to generate a first air flow Fa. The first air flow Fa is exhausted to the outside of the housing 11 from the first exhaust port 74a through a space between a first wall surface 82a facing radially outward of the side wall portion 82 of the baffle plate 80 and an inner wall surface 11s of the housing 11 facing the first wall surface 82a.

[0102] A flow path that guides the first airflow Fa sent out from the first fan 75a to the first exhaust port 74a is referred to as a "first exhaust flow path 98a." In this embodiment, a part of the first exhaust flow path 98a is formed in a space facing the first wall surface 82a of the side wall portion 82 of the baffle plate 80 and the inner wall surface 11s of the housing 11, as shown in FIG.

[0103] Next, refer to FIG. 4. When the first fan 75a is driven, negative pressure is generated upstream of the first fan 75a. This negative pressure creates a first air flow Fa that draws outside air into the housing 11 through the upper surface intake port 23 provided on the upper surface of the tool holding part 21. The first air flow Fa passes through the arrangement area of ​​the motor 32 while exchanging heat with the motor 32, and flows into the first fan chamber 71a through the inlet opening 72 of the fan housing chamber 71. In this way, while the impact tool 10 is being driven, the motor 32 is cooled by the first air flow Fa generated by the driving of the first fan 75a.

[0104] The second air flow Fb generated by the second fan 75b will be described with reference to Fig. 16. An arrow indicating the second air flow Fb is shown in Fig. 16. The second air flow Fb is generated by driving the second fan 75b in a state in which the dust collecting device 100 is connected to the connection part 90 and air can be sucked from the dust collecting device 100 through the connection opening 93 of the connection part 90.

[0105] When the second fan 75b is driven, air is sucked from the connection opening 93 of the connection part 90 through the cylindrical part 85 of the baffle plate 80 into the central intake port 77 of the second fan 75b, generating a second airflow Fb that is sent out in the centrifugal direction of the second fan 75b. The dust collector 100 uses this suction force generated by the drive of the second fan 75b to collect dust.

[0106] The second air flow Fb is guided toward the second portion 81b of the central plate portion 81 of the baffle plate 80 by the second wall surface 82b facing radially inward of the side wall portion 82 of the baffle plate 80 and the inner wall surface of the second fan chamber 71b formed by the inner wall surface of the housing 11. The second air flow Fb turns back at the second portion 81b and flows into the exhaust chamber 71c. The second air flow Fb is guided by the outer wall surface of the cylindrical portion 85 of the baffle plate 80 and the inner wall surface 11s of the housing 11, and is exhausted laterally (in the left-right direction) from the third exhaust port 74c. The second air flow Fb is also guided by the second wall surface 82b on the lower side of the side wall portion 82 of the baffle plate 80 that constitutes the inner wall surface of the exhaust chamber 71c, and the rib 86, and is exhausted downward from the second exhaust port 74b.

[0107] The flow path that guides the second airflow Fb sent out from the second fan 75b to the second exhaust port 74b is referred to as the "second exhaust flow path 98b." In this embodiment, a part of the second exhaust flow path 98b is formed in a space facing the second wall surface 82b of the side wall portion 82 of the baffle plate 80 and the inner wall surface 11s of the housing 11, as shown in Figures 13 and 14.

[0108] As described above, the first air flow Fa generated by the first fan 75a is guided to the first exhaust port 74a by the first exhaust passage 98a. On the other hand, the second air flow Fb generated by the second fan 75b is guided to the second exhaust port 74b and the third exhaust port 74c by the second exhaust passage 98b. In the impact tool 10 of this embodiment, the first exhaust passage 98a and the second exhaust passage 98b are separated from each other, and the first air flow Fa and the second air flow Fb are prevented from interfering with each other until they are exhausted to the outside of the housing 11. Therefore, the first air flow Fa and the second air flow Fb are prevented from interfering with each other and causing a pressure loss, and the flow speed of the first air flow Fa and the second air flow Fb is prevented from decreasing due to the pressure loss. Therefore, it is possible to prevent a decrease in the cooling effect of the motor 32 by the first air flow Fa and a decrease in the suction force of the dust collector 100 generated by the second air flow Fb.

[0109] As described above, in this embodiment, a part of the baffle plate 80 constitutes a partition wall that separates the first exhaust flow path 98a and the second exhaust flow path 98b. With this configuration, a part of the baffle plate 80 can be used to separate the first exhaust flow path 98a and the second exhaust flow path 98b, so that the number of parts of the impact tool 10 can be reduced.

[0110] As described above, in this embodiment, the first exhaust flow path 98a and the second exhaust flow path 98b are formed by utilizing the wall surfaces 82a, 82b of the side wall portion 82 of the baffle plate 80 and the inner wall surface 11s of the housing 11 of the fan accommodating chamber 71. Therefore, the first exhaust flow path 98a and the second exhaust flow path 98b, which are partitioned from each other, can be easily formed together in a compact manner on the side of the second fan 75b.

[0111] As described above, in this embodiment, the central plate portion 81 of the baffle plate 80 has the second portion 81b having a smaller radius than the first portion 81a. In addition, a flow path through which the second air flow Fb flows from the second fan chamber 71b to the exhaust chamber 71c is formed between the second portion 81b and the inner wall surface 11s of the housing 11. In the impact tool 10, the radius of the second portion 81b is reduced to increase the flow path cross-sectional area, and the flow path resistance of the second exhaust flow path 98b through which the second air flow Fb formed by the second portion 81b is turned back is reduced. Therefore, the decrease in the flow velocity of the second air flow Fb can be suppressed, and the suction force of the dust collector can be increased.

[0112] As described above, in the baffle plate 80 of this embodiment, the side wall portion 82 is formed on the opposite side of the second portion 81b in the centrifugal direction of the second fan 75b across the central axis of the second fan 75b. This allows the second airflow Fb sent out from the second fan 75b to be temporarily separated from the first exhaust flow path 98a. This further suppresses interference between the first airflow Fa and the second airflow Fb.

[0113] As described above, the baffle plate 80 of this embodiment is formed with ribs 86 that divide the second exhaust port 74b into a plurality of regions. According to this configuration, the ribs 86 can facilitate the exhaust of the second air flow Fb from the second exhaust port 74b, so that the pressure loss of the second air flow Fb at the second exhaust port 74b can be further reduced. In addition, the ribs 86 can prevent foreign matter from entering from the outside of the housing 11 through the second exhaust port 74b, so that the opening area of ​​the second exhaust port 74b can be increased. Therefore, the pressure loss of the second air flow Fb at the second exhaust port 74b can be further reduced. Therefore, the decrease in the suction force of the dust collecting device 100 due to the pressure loss of the second air flow Fb can be further suppressed.

[0114] In this embodiment, the first fan 75a and the second fan 75b have different configurations. Therefore, the first fan 75a can be configured to be more suitable for generating a first air flow Fa for cooling the motor, and the second fan 75b can be configured to be more suitable for generating a second air flow Fb for collecting dust. In this embodiment, even if the first fan 75a and the second fan 75b generate air flows having different wind speeds, air volumes, and wind pressures, the exhaust of each air flow is prevented from interfering with each other as described above. Therefore, the cooling performance of the motor 32 and the suction force of the dust collector 100 are prevented from decreasing due to the different configurations of the first fan 75a and the second fan 75b.

[0115] In this embodiment, the first fan 75a and the second fan 75b have different configurations for sucking in and sending out air. That is, the first fan 75a has a configuration for sucking in air from the motor 32 side and sending it out in a centrifugal direction, and the second fan 75b has a configuration for sucking in air from a central intake port 77 and sending it out in a centrifugal direction. In this way, in the impact tool 10 of this embodiment, by combining the two fans 75a and 75b with different configurations, two different air flows are efficiently generated by the same power source.

[0116] In this embodiment, an overhanging portion 78e is provided on the outer periphery of the intermediate wall portion 78M between the first fan 75a and the second fan 75b. This prevents the first airflow Fa sent out from the first fan 75a and the second airflow Fb sent out from the second fan 75b from interfering with each other inside the fan housing chamber 71. This further prevents the occurrence of pressure loss due to interference between the two airflows Fa and Fb.

[0117] In this embodiment, as shown in Fig. 3, the first exhaust port 74a, the second exhaust port 74b, and the third exhaust port 74c are gathered together at the lower end portion 35 of the housing 11. The first exhaust port 74a and the second exhaust port 74b are configured to exhaust at least a portion in the same direction, that is, downward. This configuration can suppress the exhaust air from the impact tool 10 from dispersing, thereby suppressing the dust from being blown up by the exhaust air from the impact tool 10 and hindering the machining operation.

[0118] 3, in this embodiment, the first exhaust port 74a is provided at a corner of the lower end portion 35 and is configured to be able to exhaust air in multiple directions, such as downward and sideways. With this configuration, the flow rate of the first airflow Fa exhausted from the first exhaust port 74a can be increased, thereby improving the cooling performance of the motor 32 by the first airflow Fa.

[0119] 1-6. Dust collector and impact tool system: The configurations of the dust collecting device 100 and the impact tool system 200 will be described with reference to Figures 17, 18, 19, 20, 21, and 22. As described above, the impact tool system 200 is configured by attaching the dust collecting device 100 to the impact tool 10. In the following description, the front-rear direction, up-down direction, and left-right direction related to the dust collecting device 100 and the impact tool system 200 correspond to the directions of the impact tool 10 when the impact tool system 200 is configured.

[0120] First, the configuration of the dust collecting device 100 will be described with reference to Figures 17, 18, and 19. The dust collecting device 100 includes a dust collection flow path portion 110 extending in the front-rear direction at an upper end, a dust collecting portion 120 to which the dust collection flow path portion 110 is connected, and a rearward extending portion 140 extending rearward from a lower end portion of the dust collecting portion 120.

[0121] As shown in Figs. 17 and 18, the dust collection passage section 110 is connected to the left side of the upper end of the dust collection section 120. The dust collection passage section 110 is composed of a pipe-like member that constitutes a suction passage 111, which is a passage for sucking air. A nozzle section 112 is provided at the tip of the dust collection passage section 110 so as to protrude upward. An insertion port 113 is provided at the center of the nozzle section 112, into which the tip of the tool TT is inserted. The nozzle section 112 has a dust collection suction port 114 that communicates with the suction passage 111 inside the dust collection passage section 110 and sucks in dust together with outside air.

[0122] 20 and 21, when the impact tool system 200 is configured, the dust collection passage portion 110 is disposed diagonally below and along the tool holding portion 21 of the impact tool 10. The nozzle portion 112 is disposed at a position facing the tool attachment portion 22 of the tool holding portion 21 in the front-rear direction so that the tip portion of the tip tool TT can be inserted into the insertion opening 113.

[0123] Although detailed description will be omitted, the dust collection flow path section 110 can be extended forward by sliding an internal flow path member housed inside the exterior member relative to the exterior member. This allows the nozzle section 112 to be positioned in accordance with the position of the tip of the tool tip TT attached to the tool attachment section 22. To enable the dust collection flow path section 110 to expand and contract, an expandable flexible hose that forms an air flow path is housed inside the dust collection flow path section 110.

[0124] 17 and 18, the dust collecting unit 120 has an external configuration of a substantially rectangular parallelepiped shape arranged with the longitudinal direction as the front-rear direction. The dust collecting unit 120 has a dust box 121 having a hollow rectangular parallelepiped shape, and an outer shell frame portion 130 covering the rear end side of the dust box 121.

[0125] The dust collection passage portion 110 is connected to the outer frame portion 130. An upstream communication passage 131 that connects the suction passage 111 in the dust collection passage portion 110 to the inside of the dust box 121 is provided inside the outer frame portion 130. The rear extension portion 140 described above is connected to the rear of the lower end of the outer frame portion 130.

[0126] 18 , the outer shell frame portion 130 has a pair of cover walls 132 that laterally sandwich the front end portion of the motor housing portion 30 of the impact tool 10 when the impact tool system 200 is constructed. The pair of cover walls 132 extend in the front-rear direction above the dust collection device side connection portion 142. An engaging portion that engages with an engaged portion provided on the impact tool 10 is provided on the inner wall surface of each cover wall portion 132.

[0127] The dust box 121 is detachably attached to the outer shell frame portion 130 by a latch mechanism (not shown). As shown in Fig. 19, a filter portion 122 that filters the dust sucked through the dust collection passage portion 110 is provided inside the dust box 121. The dust box 121 is configured such that the air flowing in from the dust collection passage portion 110 passes through the filter portion 122 and flows to the rear extension portion 140 as shown by the arrow AF.

[0128] 19, the bottom surface of the dust box 121 is aligned in the front-to-rear direction with the bottom surface of the rear extension 140 to form a bottom surface portion 125 of the dust collecting device 100. The bottom surface portion 125 of the dust collecting device 100 is configured so that the dust collecting device 100 can be placed in a stable position on a horizontal surface.

[0129] The upper surface of the rear extension portion 140 forms an inclined surface 141 that is inclined relative to the bottom surface portion 125 so as to face rearward. As shown in FIG. 20 , when the impact tool system 200 is constructed, the inclined surface 141 faces directly opposite the inclined bottom surface 36 of the impact tool 10.

[0130] 18 and 19. A dust collector side connection part 142 is provided on the inclined surface 141 of the rear extension part 140, and connects to the connection part 90 provided on the inclined bottom surface 36 of the impact tool 10. The dust collector side connection part 142 has an exhaust opening 143 that opens at the center, a pin 144 that is arranged on the central axis of the exhaust opening 143 so as to protrude upward, and an annular seal member 145 that is arranged on the outer circumferential edge of the exhaust opening 143.

[0131] 19, a downstream communication passage 146 that connects the dust box 121 and the exhaust opening 143 is provided inside the rear extension portion 140. As described above, when the impact tool 10 is attached to the dust collecting device 100, the pin 144 pushes up the shutter member 94 of the connection portion 90 of the dust collecting device 100, thereby opening the connection opening 93 of the connection portion 90. and an exhaust opening 143 of the dust collecting device 100. Furthermore, the inclined bottom surface 36 of the impact tool 10 compresses the seal member 145 of the dust collecting device side connecting portion 142, and the flow path between the impact tool 10 and the dust collecting device 100 is airtightly sealed. As a result, air is sucked from the dust collecting device 100 to the impact tool 10 by the suction force generated by the second fan 75b in the impact tool 10, and a suction force for sucking dust is generated in the dust collecting device 100.

[0132] A pair of end walls 148 extending upward are provided at both left and right ends of the rear extension 140. The pair of end walls 148 are configured to sandwich the front part of the lower end 35 of the impact tool 10 in the left and right direction when the impact tool system 200 is constructed. The pair of end walls 148 function as positioning parts for the connection part 90 of the impact tool 10 when connecting the connection part 90 of the impact tool 10 to the dust collector side connection part 142 of the dust collector 100. An engagement part that engages with the side surface of the lower end 35 of the impact tool 10 is provided on the inner wall surface of the pair of end walls 148. In addition, the rear extension 140 is provided with a latch mechanism that locks the impact tool 10 after it is attached.

[0133] 17 and 19, the inclined surface 141 of the dust collecting device 100 is inclined with respect to the bottom surface portion 125 so as to face the inclined bottom surface 36 of the impact tool 10 when attached to the impact tool 10. The dust collecting device 100 can suppress an increase in the overall height when attached to the impact tool 10, and can reduce the size of the impact tool system 200. This can improve the usability and handling of the impact tool system 200.

[0134] With reference to FIG. 22, the process of mounting the dust collector 100 on the impact tool 10 will be described. The impact tool 10 and the dust collector 100 are configured to be integrally connected by sliding each other in a direction perpendicular to the inclined bottom surface 36 of the impact tool 10 and approaching each other. For example, a pair of cover walls 132 provided at the rear of the outer shell frame portion 130 of the dust collector 100 and a pair of end walls 148 of the rear extension portion 140 are provided on the inner wall surfaces thereof with a pair of rails for guiding the movement of the impact tool 10 in that direction. This configuration makes it easier to mount the dust collector 10 on the impact tool 10. In addition, since the sealing pressure of the seal member 145 of the dust collector side connection portion 142 can be prevented from becoming uneven, air leakage from the connection portion 90 can be prevented, and the suction force of the dust collector 100 can be prevented from decreasing.

[0135] Please refer to Fig. 20. In the impact tool system 200, the bottom surface 125 of the dust collecting device 100 is at the lowest position. The impact tool system 200 is configured so that, by adjusting the center of gravity position and the area of ​​the bottom surface 125, the impact tool 10 can be placed in a stable position on a horizontal surface with the bottom surface 125 as a support surface when the battery BT is not attached to the impact tool 10. With this configuration, the impact tool system 200 can be placed in a stable position even when the battery BT is not attached, improving the usability of the impact tool system 200.

[0136] The impact tool system 200 is preferably configured so that it can be placed on a horizontal surface while being supported by the bottom surface portion 125 of the dust collecting device 100 even in a state where the battery BT is attached. In this case, when the bottom surface of the battery BT is at a position higher than the bottom surface portion 125 of the dust collecting device 100, the impact tool system 200 can be placed on a horizontal surface with the bottom surface portion 125 as a support surface with the battery BT floating above the horizontal surface. Also, when the bottom surface of the battery BT is at a position lower than the bottom surface portion 125 of the dust collecting device 100, the impact tool system 200 can be placed on a horizontal surface while being supported by the front end portion of the bottom surface portion 125 and the front end portion of the bottom surface of the battery BT. When the bottom surface of the battery BT is at the same height as the bottom surface portion 125 of the dust collecting device 100, the impact tool system 200 is placed on a horizontal surface while being supported by the bottom surface portion 125 of the dust collecting device 100 and the bottom surface of the battery BT.

[0137] According to the impact tool system 200 having this configuration, the impact tool 10 can be placed in a stable position on a horizontal surface when the battery BT and the dust collection device 100 are attached to the impact tool 10. Therefore, for example, the impact tool system 200 can be placed in a stable position on a horizontal surface while the impact tool system 200 is being used, and the usability of the impact tool system 200 is further improved.

[0138] 1-7. Summary: As described above, according to the impact tool 10 of this embodiment, the inclined bottom surface 36 is provided at the lower end portion 35, which facilitates attachment of the battery BT. In addition, various effects can be achieved, such as improved ease of attachment of the dust collecting device 100 attached to the impact tool 10, and improved usability and handling of the impact tool system 200 constituted by the impact tool 10 and the dust collecting device 100.

[0139] 2. Other embodiments: The technology of the present disclosure is not limited to the configurations of the above-mentioned embodiments and the configurations described as other embodiments in the above-mentioned embodiments. The configurations of the above-mentioned embodiments can be modified, for example, as follows. The configurations of the embodiments described below are positioned as one form for implementing the technology of the present disclosure, similar to the configurations described in the above-mentioned embodiments.

[0140] The inclined bottom surface 36 of the above embodiment may be applied to an impact tool having a configuration different from that of the impact tool 10 described in the above embodiment. For example, the inclined bottom surface 36 may be applied to an impact tool that does not have a component corresponding to the air flow generating section 70. Also, the inclined bottom surface 36 may be applied to an impact tool that does not have a configuration in which a dust collecting device is attached. [Explanation of symbols]

[0141] 10: impact tool, 11: housing, 11s: inner wall surface, 11w: inner wall portion, 20: front main body portion, 21: tool holding portion, 22: tool mounting portion, 23: upper intake port, 24: side handle portion, 25: dial operation portion, 26: speed change switch, 30: motor housing portion, 32: motor, 32r: rotor, 32s: stator, 32x: rotating shaft, 33a: first end portion, 33b: second end portion, 35: lower end portion, 36: inclined bottom surface, 40: rear main body portion, 41: grip portion, 42: controller housing portion, 43: rotating shaft, 44: elastic member, 45: trigger, 45c: switch circuit, 46: control portion, 47: rear bottom surface, 47s: step portion, 48: battery mounting portion, 48e: engagement portion, 48r: guide rail, 48t: connection terminal, 50: drive portion, 51: drive mechanism, 52: drive force transmission mechanism, 53: intermediate rotating shaft, 54: bevel gear, 55: swing member, 55a: base end portion, 55b: swing lever, 56: reducer, 60: tool drive mechanism, 61: tool holding member, 62: piston cylinder, 63: air chamber, 64: striker, 65: impact bolt, 70: air flow generating portion, 71: fan housing chamber, 71a: first fan chamber, 71b: second fan chamber, 71c: exhaust chamber, 71cA: First exhaust area, 71cB: second exhaust area, 72: inlet opening, 73: bottom opening, 74a: first exhaust port, 74b: second exhaust port, 74c: third exhaust port, 75a: first fan, 75b: second fan, 75w: double fan, 76a: fin, 76b: fin, 77: intake port, 78L: lower wall portion, 78M: intermediate wall portion, 78e: eaves portion, 80: baffle plate, 81: central plate portion, 81a: first portion, 81b: second portion, 82: side wall portion, 82a: first wall surface, 82a: wall surface, 82b: second wall surface, 83: central opening, 84: convex rib, 85: cylindrical portion, 86: rib, 9 0: connection portion, 91: cap member, 92c: outer cylindrical portion, 92w: bottom wall portion, 93: connection opening, 94: shutter member, 94r: reinforcing rib, 95: biasing member, 96: connection flow path, 98a: first exhaust flow path, 98b: second exhaust flow path, 100: dust collection device, 110: dust collection flow path portion, 111: suction flow path, 112: nozzle portion, 113: insertion port, 114: dust collection suction port, 120: dust collection portion, 121: dust box, 122: filter portion, 125: bottom surface portion, 130: outer shell frame portion, 131: upstream side communication flow path, 132: cover wall portion, 140: rear extension portion, 141: inclined surface,142: dust collector side connection portion, 143: exhaust opening, 144: pin, 145: seal member, 146: downstream side communication flow passage, 148: end wall, 200: impact tool system, HP: horizontal surface, TT: tip tool, BT: battery, Fa: first air flow, Fb: second air flow, rx: virtual axis,

Claims

1. It is a striking tool, A tool holder part to which a tip tool that extends in the front-to-back direction and moves back and forth in the front-to-back direction is attached, A motor housing extends downward from the tool holding portion and houses a motor for driving the tip tool, with the rotation axis intersecting in the front-rear direction. A battery mounting section is provided on the rear bottom surface facing downwards, located behind the motor housing, and is equipped with a battery that supplies power to the motor. Equipped with, The motor housing extends downward from the motor housing and from the rear bottom surface in front of the battery mounting section, and has an inclined bottom surface that is inclined forward with respect to the front-rear direction, making it a striking tool.

2. The striking tool according to claim 1, A striking tool configured to be placed on a horizontal surface using the aforementioned inclined bottom surface as a support surface.

3. A striking tool according to claim 1 or claim 2, The motor's rotating shaft is positioned at an angle that intersects the front-to-back direction, in this striking tool.

4. The striking tool according to claim 3, The inclined bottom surface is a striking tool perpendicular to the axial direction of the rotation axis.

5. The striking tool according to claim 1, An impact tool, wherein the inclined bottom surface is provided with a connection portion to which a dust collector is attached so as to be integrated with the impact tool, and which sucks up dust generated when the tip tool processes the workpiece.

6. The striking tool according to claim 5, The dust collector is configured to collect the dust by the suction force generated by the striking tool. A fan that generates the suction force is connected to the rotating shaft of the motor. The connecting portion has a connecting channel that draws air from the dust collector by the suction force generated by the fan, and is a striking tool.

7. A striking tool system comprising the striking tool according to claim 5 or claim 6, and the dust collector, A striking tool system in which the striking tool and the dust collection device are connected integrally by sliding them toward each other in a direction perpendicular to the inclined bottom surface.

8. A striking tool system comprising the striking tool according to claim 5 or claim 6, and the dust collector, A striking tool system configured to be able to be placed on a horizontal surface using the bottom surface of the dust collector as a support surface when the dust collector is attached to the striking tool.

9. The striking tool system according to claim 8, A striking tool system configured to be able to be placed on a horizontal surface while being supported by the bottom surface of the dust collector when the battery and the dust collector are attached to the striking tool.

10. A dust collector that is mounted to be integrated with the striking tool according to claim 5 or claim 6, and which sucks up dust generated when the tip tool processes a workpiece, A base portion configured to be placed on a horizontal surface, The inclined surface is inclined with respect to the bottom surface, and when mounted on the striking tool, the inclined surface faces the inclined bottom surface, A dust collector side connection part is provided on the inclined surface and is connected to the connection part of the striking tool, A dust collector equipped with the following features.

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