Impact tools

Abstract

To provide a construction technology which contributes to rationalization of an arrangement structure and operability of a member, concerning an impact tool normally performing striking operation while facing downward due to self-weight.SOLUTION: An impact tool 100 normally performing striking operation while facing downward due to self-weight, includes a motor 210 that is provided with a motor output shaft driving a drive mechanism, a controller 260 that drive-controls the motor 210, a predetermined functioning member 280 that assists the performing of striking operation, and a controller case 270 that holds the controller 260. The controller case 270 is further configured to hold the functioning member 280.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present disclosure relates to an impact tool, known as a large hammer, which is normally used to perform impact work downward in a hanging state under its own weight. [Background technology]

[0002] As an impact tool, the configuration of a so-called large hammer driven by a motor is disclosed in, for example, JP 2016-165783 A (Patent Document 1). In particular, Patent Document 1 discloses a technique for optimizing the placement of a battery in a cordless large hammer.

[0003] However, since large hammers are heavy, large in size and have a large output, there is a strong demand for streamlining the arrangement of components and the operability. In particular, as part of the recent trend of technological development that emphasizes ESG (or SDGs), there is a strong demand for reduced environmental impact, high efficiency, and ergonomic design, and the development of large hammers is no exception.

[0004] In this regard, with regard to large hammers, there is a strong demand for further rationalization in the design and assembly of large hammers, not only by optimizing the battery placement, but also by further improving the placement design of the controller for motor drive control and the functional components that assist in the execution of the striking work. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2016-165783 A Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above, an object of the present invention is to provide a construction technique that contributes to rationalizing the arrangement of components and operability of an impact tool, the normal working mode of which is to perform impact work in a downward facing position due to its own weight. [Means for solving the problem]

[0007] In order to solve the above problems, according to one aspect (aspect 1) of the present disclosure, The impact tool has a long body portion with a tool holder at a tip region, and a pair of handles extending in a second direction in which the longitudinal direction of the body portion is defined as a first direction and a width direction intersecting the first direction is defined as a second direction, and an impact operation is performed via a tip tool detachably attached to the tool holder while an operator holds the pair of handles in the left and right hands and hangs down under its own weight.

[0008] a drive mechanism that drives the tool bit in the first direction; a motor having a motor output shaft that drives the drive mechanism; and a controller that drives and controls the motor; A controller case for holding the controller and a predetermined functional member for assisting in the execution of the impact work. The controller case is further configured to hold the functional member.

[0009] The impact tool is typically suitably applied to an impact tool that normally performs impact work in a downward facing position due to its own weight, i.e., a large hammer. Particularly in large hammers, there are many controllers for controlling the motor drive and functional parts that assist in the execution of the striking work, so there is a high demand for streamlining the layout design of these parts. For this reason, the impact tool employs a controller case that holds a controller for controlling the motor drive, and is configured so that the controller case also holds certain functional components that assist in the performance of the impact work. The controller case holds not only the controller but also various functional components, thereby streamlining and facilitating the design and assembly of the impact tool.

[0010] Examples of "functional components that assist in the performance of impact work" include various devices and equipment, such as a switch for energizing the impact tool, communication equipment for the impact tool attachment, a pressure detection mechanism for releasing the soft no-load drive and switching to normal drive when a so-called soft no-load start is adopted, or an anti-vibration elastic body when an anti-vibration housing structure is adopted, etc. Originally, the placement locations of these devices and equipment within the impact tool are selected according to their respective applications, and the structure is designed accordingly, but in this impact tool, these devices and equipment are held in a controller case, thereby enabling a rational placement configuration to be realized. The controller case can be configured to hold either part of the controller or the entire controller, or to hold either some or all of the multiple functional components.

[0011] According to the present invention, there is provided a construction technique that contributes to improving the arrangement of components and workability of an impact tool that is normally used in a working state in which the tool performs impact work while facing downward due to its own weight. [Brief description of the drawings]

[0012] [Figure 1] 1 is a front (operator side) perspective view showing an overall configuration of an impact tool according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a rear perspective view showing the overall configuration of the impact tool according to the embodiment. [Diagram 3] 1 is a plan view of an impact tool according to an embodiment of the present invention; [Figure 4] 1 is a front cross-sectional view of an impact tool according to an embodiment of the present invention. [Diagram 5] 1 is a side (right side) cross-sectional view of the impact tool according to the embodiment. [Figure 6]2 is an enlarged cross-sectional view of the side (right side) of the impact tool according to the embodiment. FIG. [Figure 7] FIG. 2 is an enlarged front sectional view showing the configuration of an upper part of the impact tool according to the embodiment. [Figure 8] 2 is a partial cross-sectional plan view showing the configuration of a first sliding guide member of the impact tool according to the present embodiment. FIG. [Figure 9] 4 is a partial cross-sectional plan view showing the configuration of a second sliding guide member of the impact tool according to the embodiment. FIG. [Figure 10] 2 is a front right perspective view showing an upper internal structure of the impact tool with the head case removed; FIG. [Figure 11] 2 is a front left perspective view showing an upper internal structure of the impact tool with the head case removed. FIG. [Figure 12] FIG. 2 is a top perspective view showing the configuration of the controller case. [Figure 13] FIG. 2 is a bottom perspective view showing the configuration of the controller case. [Figure 14] FIG. 2 is a perspective view showing a configuration of a duct cover. [Figure 15] FIG. 2 is a perspective view of the configuration of the duct cover as viewed from the motor side, which is the member to be attached. [Figure 16] FIG. 4 is a partial cross-sectional view of a left side surface showing the mounting configuration of the duct member. [Figure 17] FIG. 4 is a partial cross-sectional view of a left side surface showing the mounting configuration of the duct member. [Figure 18] FIG. 2 is a perspective view showing a configuration of a detection mechanism. [Figure 19] FIG. 4 is a partial cross-sectional view of a right side surface showing a configuration of a detection mechanism in a no-load driving state. [Figure 20] 11 is a right side cross-sectional view showing an operation mode of the detection mechanism when switching from an unloaded driving state to a loaded driving state. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The above-mentioned configuration may employ the following exemplary aspects as appropriate. A combination of a plurality of exemplary aspects may also be used in the above-mentioned configuration as appropriate.

[0014] (Aspect 2) The controller case can be provided at a position including a major axis (center line) of the main body in the first direction. According to this, for example, the wire harness can be arranged symmetrically (left and right and / or front and rear) in both the width direction and thickness direction of the impact tool, thereby achieving further rationalization of the member configuration.

[0015] (Aspect 3) With regard to the first direction, if the direction from the handle to the tool holder is defined as downward, and the direction from the tool holder to the handle is defined as upward, the controller case can be provided above the motor. This facilitates the routing of the wire harness to the motor.

[0016] (Aspect 4) a first housing and a second housing which are components of the main body, and an elastic body interposed between the first housing and the second housing; the drive mechanism and the motor are provided in the first housing, the pair of handles and the controller case are provided in the second housing, and the second housing is configured to be movable together with the pair of handles relative to the first housing via the elastic body; the functional member includes a detection mechanism for detecting a relative movement of the second housing with respect to the first housing when an operator presses the handle to start a striking operation, The controller can be configured to drive the motor at a predetermined first speed in an unloaded driving state defined as a state in which the second housing is not pressed against the first housing, and to switch the motor from a driving state at the first speed to a driving state at a second speed faster than the first speed based on detection by the detection mechanism.

[0017] In this embodiment, an impact tool is provided with a handle vibration isolation mechanism, and a detection mechanism for detecting the relative movement of the second housing with respect to the first housing during impact work is adopted as one of the components of the functional member, and the controller case is configured to hold the detection mechanism. Based on the detection by the detection mechanism, the motor speed is increased and the actual impact work is started. The controller case is mounted on the second housing on the vibration-proof side so that the transmission of vibrations generated on the first housing side is suppressed; however, by using the controller case to hold the detection mechanism, further rationalization of the component configuration is achieved.

[0018] (Aspect 5) a first housing and a second housing which are components of the main body, and an elastic body interposed between the first housing and the second housing, the drive mechanism and the motor are provided in the first housing, the pair of handles and the controller case are provided in the second housing, and the second housing is configured to be movable relative to the first housing together with the pair of handles via the elastic body; The cooling device may have a duct member that transfers cooling air between the first housing and the second housing, and the functional member may include the duct member.

[0019] This embodiment provides an impact tool with a handle vibration-damping mechanism, and employs a duct member connected between a first housing and a second housing that move relative to each other as one of the components of the functional member, and the controller case is configured to hold the duct member. As in the case of the above-mentioned detection mechanism, by using the controller case to hold the duct member, the member structure can be further rationalized.

[0020] (Aspect 6) a first housing and a second housing which are components of the main body, and an elastic body interposed between the first housing and the second housing, the drive mechanism and the motor are provided in the first housing, the pair of handles and the controller case are provided in the second housing, and the second housing is configured to be movable relative to the first housing together with the pair of handles via the elastic body; The controller case has an elastic body mounting portion for mounting the elastic body. The functional member may include the elastic body that is attached to the controller case via the elastic body attachment portion.

[0021] In this embodiment, an impact tool is provided with a handle vibration isolation mechanism, and an elastic body for vibration isolation is adopted as one of the components of the functional member, and the controller case is configured to hold the elastic body via an elastic body attachment part. As in the case of the detection mechanism and duct member, by using the controller case to attach the elastic body, the component configuration can be further rationalized.

[0022] (Aspect 7) The functional member may include a wire harness insertion opening formed in the controller case for holding a lead wire connected to the controller. The lead wire may be either a single electric wire or a bundle of multiple electric wires. The lead wires tend to become loose, particularly due to vibration, but they can be held stably by the wire harness insertion opening formed in the controller case.

[0023] (Aspect 8) A main power switch may be provided for controlling the drive of the motor by the controller, and the functional member may include the main power switch as a component thereof. The main power switch is typically defined as a master switch for energizing the impact tool.

[0024] (Aspect 9) The impact tool may further include an attachment member that is used together with the impact tool in work, and a communication unit that transmits a drive control signal to the attachment member, and the functional member may include the communication unit as a component thereof. The attachment members include, for example, a dust collector for collecting dust generated during the impact work, a lighting device, and the like.

[0025] (Aspect 10) The tool may include a main power switch for controlling the drive of the motor by the controller, an attachment member that is used for work together with the impact tool, and a communication unit that transmits a drive control signal to the attachment member, and the functional member may have the main power switch and the communication unit as components, and the main power switch and the communication unit may be provided adjacent to each other on the main body. According to this, the main power switch, which is used frequently by the operator, and the communication unit for the attachment members are disposed adjacent to each other on the main body, thereby further improving operability.

[0026] An impact tool 100 according to this embodiment will be described below with reference to Figs. 1, 2 and 3 show the overall configuration of an impact tool 100 as a front perspective view, a rear perspective view and a plan view, respectively. 4 and 5 show a front sectional view and a side sectional view, respectively, of the impact tool 100, FIG. 6 shows a partially enlarged sectional view of the side of the impact tool 100, and FIG. In this embodiment, for the sake of convenience, the side facing the operator is defined as the front of the impact tool 100 .

[0027] In this embodiment, for convenience of explanation, the long axis direction of the impact tool 100 (also referred to as the long dimension direction: the up-down direction on the paper in FIG. 1) is defined as a first direction D1. Further, a width direction (also called a left-right direction: left-right direction on the paper in FIG. 1) intersecting with the long axis direction is defined as a second direction D2. Moreover, the thickness direction of the impact tool 100, which is a direction perpendicular to the first direction D1 and the second direction D2, is defined as a third direction D3. Furthermore, with regard to the first direction D1, the direction toward the bottom of the paper surface in FIG. 1 is defined as D1D, and the direction toward the top of the paper surface is defined as D1U.

[0028] (Overall composition) As shown in FIGS. 1 to 6, the impact tool 100 generally includes a first housing 110 and a second housing 120 in external appearance. The second housing 120 is connected to the upper side of the first housing 110 in the first direction D1, and is movable relative to the first housing 110. (Configuration of the first housing 110) The first housing 110 is formed in an elongated shape and has an upper drive mechanism accommodating portion 111 , a lower drive mechanism accommodating portion 112 , and a tip region 113 . Further, a side area 114 is formed on the second direction D2 side of the upper drive mechanism accommodating portion 111 and the lower drive mechanism accommodating portion 112. The upper drive mechanism accommodating portion 111, the lower drive mechanism accommodating portion 112, and the tip region 113 are arranged in this order from the upper side to the lower side in a connected state in the first direction D1.

[0029] The upper drive mechanism housing section 111 mainly houses the motor 210 and the motion conversion mechanism 170. The lower drive mechanism housing section 112 mainly houses the impact mechanism 180. The motion conversion mechanism 170 and the impact mechanism 180 are examples of a configuration corresponding to a "drive mechanism". The motor 210, the motion conversion mechanism 170 and the impact mechanism 180 will be described in detail later. The tip region 113 is provided with a tool holder 240 and a retainer 250 . The tool holder 240 is a member for mounting a tool used in striking work, and the retainer 250 functions as a member for preventing the tool tip mounted in the tool holder 240 from falling out. For convenience, the tool tip is omitted from the drawings.

[0030] (Configuration of second housing 120) The second housing 120 is provided above and connected to the first housing 110 in the first direction D1. The second housing 120 has a head case 121, a handle attachment portion 122, and a battery attachment portion 123. Head case 121 constitutes the outer shell of second housing 120, and mainly houses controller 260 and controller case 270 (see also FIGS. 10, 11, etc.). A cooling air intake port 127 is provided on the top surface of head case 121 in the upper direction D1U.

[0031] The handle attachment parts 122 are arranged in a pair in the second direction D2, are integrally connected to the head case 121, and have a handle 130, which will be described later, attached thereto. The battery mounting parts 123 are provided in a pair in the second direction D2, connected to the handle attachment part 122 on the lower side in the first direction D1D, and each of the battery mounting parts 123 has a battery 150 mounted therein, which will be described later.

[0032] The battery mounting portion 123 is configured to be disposed in a side region 114 of the first housing 110, and in a region 130A of the second housing 120 directly below the handle attachment portion 122 in the first direction D1. The battery mounting section 123 also has a slide guide 124 for when the battery is mounted, and a power supply terminal 125 (see FIG. 4). Each battery mounting section 123 also has a battery protector 128 for protecting the outer shell of the battery 150 mounted in the battery mounting section 123 from external forces.

[0033] The head case 121, the handle attachment portion 122, and the battery mounting portion 123 including the battery protector 128 are integrally connected to form the second housing 120, and are configured to be movable integrally relative to the first housing 110 in the first direction D1. The detailed configuration of the relative movement of the second housing 120 with respect to the first housing 110 will be described later.

[0034] (Configuration of handle 130) The handle 130 has a pair of a first handle portion 131 and a second handle portion 141 each of which extends in a protruding manner from the first housing 110 in the second direction D2. Typically, the first handle portion 131 is adapted to be held by an operator's right hand, and the second handle portion 141 is adapted to be held by an operator's left hand. As shown in detail in Fig. 3, the first handle portion 131 has a first handle base portion 132, a first handle gripping portion 133, and a free end region 134. A trigger 135 is provided on the first handle gripping portion 133. The trigger 135 is always biased to the OFF position, and can be moved to the ON position against the biasing force toward the OFF position by manually pressing the trigger 135 while gripping the first handle portion 131. Figs. 1 to 4 show the trigger 135 in the OFF position (initial state).

[0035] When the pressing operation by the operator is released, the trigger 135 returns to the initial state by the biasing force toward the OFF position. As shown in Fig. 4, the trigger 135 is connected to an electric switch 136 provided in the handle attachment part 122. When the trigger 135 moves to the ON position, the electric switch 136 is turned ON, and an ON signal is sent to the controller 260, which will be described later. The second handle portion 141 has a second handle base portion 142 , a second handle gripping portion 143 , and a free end region 144 .

[0036] (Configuration of battery 150) As shown in Figures 1 to 3, battery 150 is a roughly rectangular cube having a battery front surface 151, a battery top surface 152, a battery bottom surface 153, and a battery rear surface 154, and is configured as a package that houses a battery pack made up of multiple batteries. Furthermore, an unlocking portion 155 is provided in an area of ​​the battery upper surface portion 152 adjacent to the battery rear surface portion 154. The unlocking portion 155 is manually operated when the battery 150 is removed from the second housing 120. 3, the battery 150 is attached to the battery attachment portion 123 of the second housing 120 by sliding in a battery attachment direction 156. As a result, the battery 150 is electrically connected to the power supply terminal 125 while engaged with the slide guide 124 in the battery attachment portion 123, and is placed in a state in which it can supply power to the impact tool 100.

[0037] The battery mounting direction 156 is defined as a direction that intersects (is perpendicular to) the first direction D1 and the second direction D2 and is aligned with the third direction D3. On the other hand, the battery 150 is removed from the second housing 120 by manually operating the unlocking portion 155 and sliding it in the direction opposite to the battery mounting direction 156. In other words, the battery mounting direction 156 and the removal direction (the direction opposite to the battery mounting direction 156) intersect (are perpendicular to) the first direction D1 and the second direction D2.

[0038] The battery protector 128 described above covers the battery front surface 151, the battery top surface 152, the battery bottom surface 153 (and parts of the battery side surfaces) when the battery 150 is attached to the battery attachment portion 123, and protects the battery 150 from external forces. In other words, the battery protector 128 has a configuration as a cover member that covers all or part of the battery front surface 151, the battery top surface 152, and the battery bottom surface 153. 4, an LED light 129 for illuminating the tip region 113 or the tip of the tool tip is provided on the lower surface (lower side in the first direction D1D) of the battery protector 128. The LED light 129 is one of the functional members that assists in the performance of the impact work.

[0039] In this embodiment, the battery 150 attached to the battery attachment portion 123 is configured to be positioned together with the battery protector 128 inside an imaginary line HL connecting each free end region 134, 144 of the first handle portion 131 and the second handle portion 141 to the tip region 113 of the first housing 110 (on the side closer to the impact tool 100 than the imaginary line HL), as shown in FIG. This prevents the battery 150 and the battery protector 128 mounted on the battery mounting portion 123 from interfering with the impact work. In addition, in the unlikely event that the impact tool 100 falls over, the battery 150 (and the battery protector 128) is disposed inside the imaginary line HL assumed to be a ground line, thereby preventing the battery 150 from being subjected to an impact when the impact tool 100 falls over, and thus improving protection against external forces.

[0040] (Configuration of motor 210) 5 and 6, the motor 210 is mainly composed of a stator 211, a rotor 212, an output shaft 213 integrally connected to the rotor 212, and a cooling fan 214 integrally connected to the output shaft 213. In this embodiment, a centrifugal fan is used as the cooling fan 214. Each element of the motor 210 is housed within a motor housing 215 and is disposed within the first housing 110 . The output shaft 213 is connected to the first intermediate shaft 171 of the motion conversion mechanism 170 described above on the side opposite the operator in the third direction D3 so as to be capable of transmitting rotation at a predetermined reduction ratio, and the rotational output from the motor 210 is transmitted from the output shaft 213 to the motion conversion mechanism 170 via the first intermediate shaft 171. In this embodiment, a brushless motor is used as the motor 210 in order to obtain a relatively large output while being relatively small in size. Since the structure of a brushless motor itself is a well-known technology, a detailed description thereof is omitted in this specification.

[0041] The output shaft 213 is disposed so as to intersect with the first direction D1 and the second direction D2, while extending along the third direction D3. In other words, the output shaft 213, which is likely to have the largest dimension among the motor 210, is disposed so as to extend in the third direction D3, which is the thickness direction of the impact tool 100, so that the largest dimension of the motor 210 is allocated to the third direction D3, and instead, a large space for arranging other functional components is secured along the second direction D2, which is the width direction of the impact tool 100.

[0042] 1 and 4, it becomes easier to secure the space of the side region 114 in the second direction D2 of the first housing 110. In this embodiment, the expansion space S secured in the side region 114 is utilized, and the battery mounting section 123 is provided as part of the second housing 120, and even when the battery 150 is mounted in the battery mounting section 123 or when the battery protector 128 is arranged, the space efficiency is optimized so as not to interfere with work.

[0043] (Configuration of the motion conversion mechanism 170) As shown in FIGS. 5 and 6, the motion converting mechanism 170 is mainly composed of a first intermediate shaft 171, a second intermediate shaft 172, a crank mechanism 173, a cylinder 174, a piston 175, an air chamber 176, and a vibration damping mechanism 177. As described above, the first intermediate shaft 171 is connected to the output shaft 213 of the motor 210 so as to be capable of transmitting rotation, and the first intermediate shaft 171 is further connected to the second intermediate shaft 172 so as to be capable of transmitting rotation at a predetermined reduction ratio. The second intermediate shaft 172 is integrally connected to the crank mechanism 173 and is connected to the vibration suppression mechanism 177 so as to be capable of driving the vibration suppression mechanism 177 .

[0044] The crank mechanism 173 converts the rotational motion of the second intermediate shaft 172 about the third direction D3 into linear motion in the first direction D1, causing the piston 175 to linearly reciprocate in the first direction D1. The linear motion of the piston 175 is configured to generate pressure fluctuations in an air chamber 176 in the cylinder 174.

[0045] The vibration suppression mechanism 177 has a counterweight 178 that reciprocates linearly in the first direction D1 along the outer periphery of the cylinder 174. The counterweight 178 is a member that operates against the impact action of the impact mechanism 180 described below and suppresses vibrations generated in the impact tool 100 during impact work.

[0046] (Configuration of the impact mechanism 180) 5 and 6, the impact mechanism 180 is mainly composed of a striker 181 and an impact bolt 182. As described above, when a pressure fluctuation occurs in the air chamber 176 in the cylinder 174, the striker 181, which is also disposed in the cylinder 174 facing the piston 175 across the air chamber 176, moves linearly in the first direction D1, causing the impact bolt 182 to move linearly in the first direction D1.

[0047] As a result, the impact bolt 182 linearly moves a tool tip (not shown for convenience) attached inside the tool holder 240, and the tool tip performs an impact operation in the first direction D1. The retainer 250 prevents the tool bit from coming off in the first direction D1. The retainer 250 is movable between a stop position for preventing the tool from coming off (corresponding to FIG. 5) and a release position by rotating about a rotation center 251 in FIG.

[0048] (Configuration of the first sliding guide member 190) As described above, first housing 110 and second housing 120 are configured to be capable of relative movement in first direction D1. In this embodiment, as shown in FIGS. 7 to 9, a first sliding guide member 190 and a second sliding guide member 200 are provided to facilitate the relative movement. The first sliding guide member 190 is provided in the vicinity of the handle 130 (at a height position substantially equal to that of the handle 130) in the first direction D1. The first sliding guide member 190 has a pipe-shaped member 191 which is a component on the first housing 110 side, and a bifurcated member 192 which is a component on the second housing 120 side. The bifurcated member 192 is a member having paired parts that are literally bifurcated into two parts, and is also called a forked member or bifurcated member. The pipe-shaped member 191 is made of metal, has a circular cross section, and is fixedly disposed in the first housing 110 with its major axis facing the first direction D1. The bifurcated member 192 is made of resin, and is fixed integrally with the handle 130 to the handle attachment portion 122 of the second housing 120. The bifurcated member 192 is loosely fitted into the pipe-shaped member 191 with the bifurcated portions along the outer circumferential surface of the pipe-shaped member 191, and is configured to be slidably movable relative to the pipe-shaped member 191 in the first direction D1. In this embodiment, a plurality of first sliding guide members 190 are arranged around the first direction D1 (two are arranged in a pair facing each other as shown in FIG. 8).

[0049] (Configuration of the second sliding guide member 200) The second sliding guide member 200 is disposed on the lower side in the first direction D1D than the above-described first sliding guide member 190. Specifically, in relation to the first direction D1, the second sliding guide member 200 is provided in the vicinity of the battery 150 (at substantially the same height as the battery 150). The second sliding guide member 200 has a convex member 201 , a concave member 202 , and a sliding guide 203 .

[0050] The convex member 201 is made of resin, is fixedly provided on the first housing 110 side, and is configured to protrude outward in the second direction D2 as shown in FIG. The concave member 202 is made of resin and is provided on the second housing 120 side, and as shown in FIG. 9, fits with the convex member 201 in a state in which they are relatively slidable in the first direction D1. The sliding guide 203 is formed by bending a thin metal plate, and as shown in FIG. 9, is fixed by welding to the first housing 110 and is disposed between the convex member 201 and the concave member 202 to guide the relative sliding movement between the convex member 201 and the concave member 202 while providing rigidity reinforcement. Furthermore, in this embodiment, a plurality of second sliding guide members 200 are arranged around the first direction D1 (as shown in FIG. 9, two are arranged in a pair facing each other).

[0051] The second sliding guide member 200 is provided with a buffer member 205. The buffer member 205 is capable of coming into contact with a buffer member abutment seat 126 on the second housing 120 side. The cushioning member abutment seat 126 has a wedge-shaped cross section, and is formed integrally with the battery mounting portion 123 of the second housing 120. The cushioning member 205 is made of an elastic material such as rubber, urethane, sponge, or the like, and is fixedly attached to the first housing 110. Specifically, the cushioning member 205 is provided on the back surface side of the convex member 201 as shown in FIG. When the first housing 110 and the second housing 120 move relatively in a direction in which they approach each other, the buffer member 205 is compressed by the buffer member abutment seat 126 on the second housing 120 side. The relative movement between the first housing 110 and the second housing 120 is buffered by this compression.

[0052] The impact tool 100 according to this embodiment further includes a stopper 204 . As shown in FIG. 7, the stopper 204 receives the forked member 192 on the second housing 120 side, thereby determining the maximum distance of relative movement between the first housing 110 and the second housing 120 in the first direction D1 (i.e., the movable stroke distance).

[0053] (Arrangement of multiple sliding guide members) In this embodiment, in the first direction D1, the first sliding guide member 190 constitutes the handle-proximal side sliding guide member, and the second sliding guide member 200 constitutes the handle-remote side sliding guide member. The relative movement of the first housing 110 and the second housing 120 is supported in the first direction D1 by a plurality of sliding guide members, thereby ensuring the stability of the movement. Furthermore, as shown in Figures 8 and 9, the first sliding guide member 190 and the second sliding guide member 200 are each arranged in multiple numbers around the first direction D1, thereby further ensuring the stability of the relative movement between the first housing 110 and the second housing 120.

[0054] (Anti-vibration structure) As shown in Figures 4 and 7, the first housing 110 and the second housing 120 are configured to be able to move relative to each other (closer or farther away) in a first direction D1 with a biasing force acting thereon, by interposing a first elastic body 161 and a second elastic body 162 therebetween. In this embodiment, a metal coil spring is used for each of the first elastic body 161 and the second elastic body 162. Alternatively, for example, a leaf spring, rubber, soft resin, an actuator, or the like can also be used.

[0055] The first elastic body 161 is disposed between the first housing 110 and the second housing 120, on the lower side D1D in the first direction from the handle 130. In this embodiment, the first elastic body 161 is configured as a pair structure. The lower end of the first elastic body 161 is attached to a first elastic body mounting seat 120A provided in the upper drive mechanism accommodating portion 111, as shown in FIG. On the other hand, the upper end of the first elastic body 161 is placed in a free end state with the pressing seat 120C attached thereto. 7, the pressing seat 120C has an L-shaped cross section, and the bottom of the L-shaped cross section is fitted into the upper end of the first elastic body 171. On the other hand, the upper end of the L-shaped cross section is disposed opposite the bifurcated member 192 on the first housing 110 side.

[0056] Before the impact operation is started (initial state), the upper end of the pressing seat 120C and the bifurcated member 192 of the first sliding guide member 190 are disposed opposite to each other with a predetermined clearance 190CL therebetween. In this embodiment, the clearance 190CL is set to 2 millimeters (2 mm).

[0057] When the first housing 110 moves relatively downward in the first direction D1D and approaches the second housing 120, the forked member 192 first moves downward along the pipe-shaped member 191 a distance equivalent to the clearance 190CL and comes into contact with the upper end of the pressing seat 120C of the first elastic body 161.

[0058] Furthermore, as the first housing 110 moves downward in the first direction D1D relative to the first housing 110, the bifurcated member 192 compresses the first elastic body 161 via the pressing seat 120C. As a result, the biasing force of the second elastic body 162 generated in response to the compression acts between the first housing 110 and the second housing 120.

[0059] In this embodiment, the first elastic body 161 is disposed between the first sliding guide member 190, which is the handle-adjacent side sliding guide member, and the second sliding guide member 200, which is the handle-remote side sliding guide member, in the first direction D1. Therefore, the biasing force can be applied in a so-called both-end supported state, and adverse effects of the biasing force due to components other than the first direction D1 (such as the generation of a tilting force during relative movement) can be avoided. Moreover, the first elastic body 161 is disposed in a region directly below the first sliding guide member 190 in the first direction D1, and the vibration damping effect on the handle 130 is improved.

[0060] On the other hand, the second elastic body 162 in this embodiment is disposed between the first housing 110 and the second housing 120, on the upper side D1U of the handle 130 in the first direction. In this embodiment, the second elastic body 162 is configured as a pair structure (also see FIG. 10, etc.). An end portion on one side (upper side D1U in the first direction) of each second elastic body 162 is attached to a second elastic body attachment portion 278 (second housing 120 side) of the controller case 270. The detailed structure of the controller case 270 is also shown in Figures 12 and 13. On the other hand, an end portion on the other side (lower side D1D in the first direction) of each second elastic body 162 is attached to a second elastic body attachment seat 120B (first housing 110 side). Thus, the second elastic body 162 is interposed between the first housing 110 and the second housing 120 .

[0061] When an operator grips the handle 130 and presses it downward in the first direction D1D, the second housing 120 integrated with the handle 130 moves relatively in the downward first direction D1D against the biasing force of the second elastic body 162, and moves closer to the first housing 110.

[0062] The first elastic body 161 and the second elastic body 162 are "Elastic modulus of first elastic body 161>Elastic modulus of second elastic body 162" It is set so that: Specifically, the first elastic body 161 (a coil spring in this embodiment) is determined to have a relatively large elastic modulus to effectively suppress the transmission of vibrations generated on the first housing 110 side during impact operation to the second housing 120 side, i.e., to fully ensure the vibration-proof housing structure of the impact tool 100.

[0063] On the other hand, the second elastic body 162 is (1) When no impact operation is being performed, it is sufficient to hold the weight of the second housing 120, the functional components attached to the second housing, and the battery 150, in other words, to hold heavy objects on the second housing 120 side away from the first housing 110. and, (2) When starting the impact operation, the elastic constant is determined to an extent that the operator can press handle 130 downward in the first direction D1D to move second housing 120 relatively toward first housing 110, in other words, to an extent that second housing 120 can be easily pressed toward first housing 110 manually.

[0064] (Internal configuration of the first housing 110 with the head case 121 removed) 10 and 11 show the upper internal configuration of the impact tool 100 with the head case 121 shown in FIG. 1 removed.

[0065] Fig. 10 shows the upper internal structure of the impact tool 100 as viewed from the front right side with the head case 121 removed. Meanwhile, Fig. 11 shows the upper internal structure of the impact tool 100 as viewed from the front left side with the head case 121 removed. Second housing 120 connected to first housing 110 on the upper side D1U in the first direction holds controller 260, a controller case 270 that holds controller 260, a main power switch 281, a communication unit 282, and a detection mechanism 290.

[0066] The controller 260 is a member that mainly controls the drive of the motor 210. The controller 260 is configured as an assembly that houses a control board and has heat dissipation fins 261 formed on the upper surface, that is, a control board assembly. The control board mainly includes a CPU, a memory, etc. The main power switch 281, the communication unit 282, and the detection mechanism 290 all constitute a functional member 280 for assisting the impact tool 100 in carrying out the impact work.

[0067] The second housing 120, while holding the above-mentioned components, is connected to the first housing 110 with the second elastic body 162 interposed therebetween. The biasing force of the second elastic body 162 acts on both the first housing 110 and the second housing 120 in the first direction D1.

[0068] Meanwhile, the first housing 110 holds a motor housing 215, which houses the motor 210, at its upper end portion on the upper D1U side in the first direction. A duct cover 220 is connected to the motor housing 215. As shown in FIG. 6, the duct cover 220 is connected to the motor housing 215 at an end region on the side facing the cooling fan 214, out of both end portions of the output shaft 213 of the motor 210. As shown in FIG. 11, a duct member 230 is connected between the duct cover 220 and the controller case 270.

[0069] The detailed configuration of each component will be described below in order. (Configuration of controller case 270) The detailed configuration of the controller case 270 is shown in Figures 12 and 13. Of these, Figure 12 is a perspective view of the controller case 270 from the top side, and Figure 13 is a perspective view of the controller case 270 from the bottom side. The controller case 270 is mainly composed of a frame 271 with a frame structure that functions as a holder for the controller 260, and a duct member mounting portion 272, a head case mounting portion 273, a detection mechanism mounting portion 274, a main power switch mounting portion 275, a communication unit mounting portion 276, a wire harness insertion opening 277, and a second elastic body mounting portion 278 are integrally molded on the frame 271. Although not specifically shown, lead wires (electric wires) for electrically connecting the controller 260 to the battery 150, the motor 210, the electric switch 136, etc. are inserted and held in the wire harness insertion opening 277. The lead wires may be either a single wire (single) or multiple wires bundled together.

[0070] (Configuration of duct cover 220) The detailed structure of the duct cover 220 is shown in perspective views in FIGS. FIG. 14 is a front perspective view of duct cover 220, and FIG. 15 is a perspective view of duct cover 220 as viewed from the motor 210 side, which is an attached member. Duct cover 220 has internal space 221, motor mounting seat 222, flange 223, cooling air guide path 224, and duct member mounting portion 225. The cooling air that has cooled controller 260 described above is configured to be sent to motor 210 through duct member mounting portion 225 of duct cover 220, cooling air guide path 224, and internal space 221 (also see FIG. 11).

[0071] The duct cover 220 thus configured is screwed to the motor housing 215 by utilizing the motor mounting seat 222 (see also FIGS. 10 and 11). As shown in Fig. 6, the duct cover 220 is attached to the motor housing 215 at the end (the operator side) of the output shaft 213 of the motor 210 opposite to the end where the cooling fan 214 is attached, in the third direction D3. Therefore, when the cooling fan 214 rotates together with the output shaft 213, the cooling air is sent to the motor housing 215 via the duct member attachment portion 225, the cooling air guide path 224, and the internal space 221 in the duct cover 220 shown in Fig. 15 by the axial flow action of the cooling fan 214, and further circulates in the motor housing 215 along the output shaft 213 in the third direction D3. This allows the motor 210 accommodated in the motor housing 215 to be cooled.

[0072] (Configuration of duct member 230) 11, 16 and 17 show details of the duct member 230. Of these, Figure 16 is a second direction cross-sectional view of the left side surface cut in the first direction D1 so as to pass through the central axis of the first end 232 of the duct hose 231 in Figure 11, and Figure 17 is a second direction cross-sectional view of the left side surface cut in the first direction D1 so as to pass through the central axis of the second end 233 of the duct hose 231 in Figure 11. The duct member 230 is a member for supplying the cooling air that has cooled the controller 260 to the motor housing 215, and is mainly constituted by a duct hose 231.

[0073] The duct hose 231 has a first end 232 connected to a duct member mounting portion 272 of the controller case 270 (see also FIGS. 12 and 13), and a second end 233 connected to a duct member mounting portion 225 of the duct cover 220. As a result, the duct member 230 is disposed between the first housing 110 and the second housing 120 in an intervening manner.

[0074] 16, the first end 232 of the duct hose 231 is directly and fitted into the duct member mounting portion 272 of the controller case 270. In other words, the first end 232 is directly fitted into the duct member mounting portion 272 without using a separate auxiliary device such as an adapter (without using an adapter). 17, the second end 233 of the duct hose 231 is directly and fitted to the duct member mounting portion 225 of the duct cover 220 connected to the motor 210. In other words, the second end 233 is directly fitted to the duct member mounting portion 225 without using any auxiliary device such as an adapter (without using an adapter).

[0075] The duct hose 231 in this embodiment is made of a member that applies a biasing force to the contracting side so that the duct hose 231 returns to the initial state when it is expanded from a predetermined initial state. In this embodiment, a hose with a bellows structure is used. In this embodiment, the duct hose 231, which is stretched by a predetermined amount from its initial state, is arranged in a connected state between the first housing 110 and the second housing 120. Therefore, the duct hose 231 is placed in a state where a biasing force is constantly applied to the contracting side so as to return it to its initial state. As a result, the duct hose 231 always tries to contract, so that it does not slacken unnecessarily inside the impact tool 100, and a structure is obtained that can prevent the duct hose 231 from rubbing against other components and becoming worn, even when the first housing 110 and the second housing 120 move relative to each other. Specifically, by adopting the vibration-proof structure, the connection distance between first housing 110 and second housing 120 by duct hose 231 is shortened from the initial state. In this case, if no biasing force toward the contraction side is applied to duct hose 231, unnecessary slack will be generated in duct hose 231 due to the shortening of the connection distance, and this slack will cause friction with other components, etc. In this embodiment, by adopting duct hose 231 in which a biasing force acts toward the contraction side so as to return to a predetermined initial state, such a problem can be prevented in advance.

[0076] 11, first end 232 of duct hose 231, i.e., the end cross section on the controller case 270 side, which is the upper side in the first direction D1U, is a surface formed by the second direction D2 and the third direction D3. In other words, the central axis of the upper end side of duct hose 231 is configured to be along the first direction D1. Meanwhile, the cross section of the second end 233 of the duct hose 231, that is, the end portion on the duct cover 220 side, which is on the downward first direction D1D side, is a surface formed by the first direction D1 and the second direction D2. In other words, the central axis of the lower end side of the duct hose 231 is configured to be along the third direction D3.

[0077] As a result, the cross sections of first end 232 and second end 233 are configured to intersect with each other. That is, the central axis of first end 232 is along the first direction, and the central axis of second end 233 is along the second direction D2, so that the central axes intersect (approximately perpendicular). This configuration is advantageous from the viewpoint of avoiding twisting of duct hose 231 and application of unnecessary tension when duct hose 231 is connected between members whose distance changes relatively in a vibration-proof structure in which first housing 110 and second housing 120 move relative to each other.

[0078] Further, the first end 232 of the duct hose 231 is configured to be located in an area adjacent to and above the cooling fan 214 of the motor 210 (see also FIGS. 4 and 5, etc.). 16 and other figures, cooling air intake port 127A is provided in head case 121 so as to correspond to at least the end portion of the side facing duct member attachment portion 272 of controller case 270. This configuration improves the cooling effect of controller 260 by allowing cooling air to flow over a long distance from cooling air intake port 127A to first end portion 232 of duct hose 231 attached to duct member attachment portion 272 located at the opposite end portion. In this embodiment, cooling air intake port 127 is formed not only at the end portion facing duct member attachment portion 272 but also in the center of the top surface of head case 121, improving the intake efficiency of cooling air. As shown in FIG. 11, the duct hose 231 is placed in a state in which the curved shape of the central portion is generally maintained by the duct portion guide rib 116 provided on the motor housing 215.

[0079] (Configuration of functional member 280) In this embodiment, as shown in Figures 3, 10, and 11, a main power switch 281, a communication unit 282, and a detection mechanism 290 are provided as examples of various functional components 280 that assist the impact tool 100 in performing an impact operation. The main power switch 281 is a start switch for turning on the power to the impact tool 100. When an operator manually turns on the main power switch 281, the controller 260 starts controlling the drive of the impact tool 100 via the power supply from the battery 150. When the main power switch 281 is manually turned to the ON position by an operator, the ON position is basically maintained until the switch is manually returned to the OFF position. However, in this embodiment, from the viewpoint of energy saving, etc., if no operation is performed for 60 seconds after the switch is turned on, the switch is automatically set to return to the off position. Furthermore, when the main power switch 281 is turned on, the operation lamp lights up to visually notify the operator that the power is on.

[0080] The communication unit 282 is a member for transmitting a drive control signal to an attachment member (auxiliary device) that is used together with the impact tool 100 for impact work. In this embodiment, a dust collector is used as the attachment member. In addition, Wifi, Bluetooth, etc. will be used as communication methods.

[0081] (Configuration of detection mechanism 290) Further, the configuration of the detection mechanism 290, which is one of the components of the functional member 280, will be described. The basic configuration of the detection mechanism 290 is shown in FIGS. The detection mechanism 290 includes an assembly base 291 , a movable member 292 provided with a magnetic body, a movable member biasing elastic body 293 , and a magnetic sensor 294 . The detection mechanism 290 is attached to a detection mechanism attachment portion 274 of the controller case 270 (see also FIGS. 12 and 13). Furthermore, the detection mechanism 290 is connected to the controller 260 by a wire harness (not shown for convenience) (see FIG. 10, etc.).

[0082] The movable member 292 is movable in the first direction D1 while being held by the assembly body base 291. The movable member biasing elastic body 293 is interposed between the movable member 292 and the assembly body base 291, and constantly applies a biasing force to the movable member 292 downward in the first direction D1D. 19, the lower end of the movable member 292 faces the upper end of the duct cover 220, and is configured to form a predetermined clearance 290CL in the initial state before the striking operation is performed. In this embodiment, the clearance 290CL is set to 1 mm (millimeter).

[0083] In this embodiment, in the initial state, the state in which the sensor 294 detects the magnetism of the movable member 292 is maintained. In other words, in the state in which the sensor 294 detects the magnetism on the movable member 292 side, the controller 260 determines that the detection mechanism 290 is in the initial state. On the other hand, as shown in FIG. 20, when the first housing 110 and the second housing 120 move relative to each other so as to approach each other, the clearance 290CL disappears as a result of the relative movement, and the lower end of the movable member 292 and the upper end of the duct cover 220 are placed in contact with each other.

[0084] When the first housing 110 and the second housing 120 further move relative to each other from this state so as to approach each other, the duct cover 220 pushes the movable member 292 upward in the first direction D1U against the biasing force of the movable member biasing elastic body 293. When the movable member 292 moves upward in the first direction D1U, the sensor 294 stops detecting magnetism (no longer detects magnetism), and the controller 260 detects the pressing of the impact tool 100 through the detection mechanism 290. That is, the detection mechanism 290 functions as a so-called push drive sensor. In this embodiment, the impact tool 100 is switched from an unloaded driving state to a loaded driving state upon detection of the pressing force, and the detailed operation thereof will be described later.

[0085] (Operational mode of the impact tool 100 according to this embodiment) Hereinafter, the operation of the impact tool 100 according to this embodiment will be described. The impact tool 100 according to this embodiment is configured as a so-called large hammer, and is normally used to perform a striking operation downward in a state in which the impact tool 100 hangs down due to its own weight. It should be noted that the terms "hanging" and "downward" used here do not only refer to directions that completely coincide with the first downward direction D1D, but can also include other directional components.

[0086] (Motor 210 power supply: soft no-load start) When an operator performs an impact operation using the impact tool 100, he or she first grasps the handle 130 with his or her hand, places the impact tool 100 in a hanging position under its own weight (with the tool holder 240 facing downward in the first direction D1D), and manually turns on the main power switch 281. Furthermore, the operator manually turns on trigger 135 while gripping handle 130. Based on the turning on of main power switch 281 and trigger 135, controller 260 drives motor 210 to rotate at a predetermined first speed (first rotation speed) R1.

[0087] A specific setting value of the first speed R1 is determined, for example, according to an idling setting that allows a smooth transition to the subsequent normal driving operation (load driving state) while appropriately reducing power consumption. The first speed R1 is set in a relatively low speed range, so that vibrations generated in the impact tool 100 via the vibration suppression mechanism 177 are reduced as much as possible. This point will be described later.

[0088] The reason why the condition for energizing and driving the motor 210 is that both the main power switch 281 and the trigger 135 are turned on is to thoroughly prevent malfunction of the impact tool 100. Also, from the viewpoint of thoroughly preventing malfunction, the motor 210 is set not to be energized and driven even if the trigger 135 is turned on before the main power switch 281 is turned on. In this embodiment, as described above, a brushless motor is used for the motor 210, and when the main power switch 281 and the trigger 135 are turned on, the controller 260 controls the drive of the motor 210 by so-called PWM control.

[0089] (Definition of the no-load driving state of the impact tool 100) In this embodiment, a state in which the motor 210 is driven and the second housing 120 is not being pressed against the first housing 110 is defined as an "unloaded driving state." This "unloaded driving state" can also be defined as the following state: (1) Initial state before the impact operation begins. (2) A state in which no load other than its own weight is acting on the cutting tool, in other words, the cutting tool is not intentionally pressed against the workpiece (other than its own weight) and is driven "without load." or, (3) A state in which the operator is not pressing the handle 130, i.e., a state in which no relative movement is occurring between the first housing 110 and the second housing 120, or a state in which neither the first elastic body 161 nor the second elastic body 162 is compressed. The unloaded driving state is also called a "no-load driving state".

[0090] (Operation of the motion conversion mechanism 170) 5 and 6, when the motor 210 is driven to rotate, the rotational output of the output shaft 213 of the motor 210 around the third direction D3 is transmitted to the first intermediate shaft 171 and the second intermediate shaft 172 and converted into linear motion in the first direction D1 by the crank mechanism 173, whereby the piston 175 moves linearly in the first direction D1 inside the cylinder 174. Similarly, the vibration suppression mechanism 177 mainly composed of a counterweight 178 moves linearly in the first direction D1 on the outer periphery of the cylinder 174 with a different phase.

[0091] When the impact tool 100 is in an unloaded driving state, the impact bolt 182 shown in Figures 5 and 6 moves by its own weight from the position shown in Figures 5 and 6 to the tip side of the tool holder 240 in the downward first direction D1D, and the striker 181 also moves by its own weight to the tip side of the cylinder 174 in the downward first direction D1D so as to be connected to the impact bolt 182. In other words, in an unloaded driving state, the impact bolt 182 and the striker 181 are placed in a state of hanging down in the downward first direction D1D by their own weights.

[0092] In this case, because striker 181 is located at the frontmost position within cylinder 174, air chamber 176 within cylinder 174 is open to the outside through vent hole 174A of cylinder 174 shown in Fig. 6, and even though piston 175 is being driven, no pressure fluctuation occurs within air chamber 176 and striker 181 is not actuated. Note that, for convenience, Fig. 6 shows the opposite state, in which air chamber 176 is not open to the outside through vent hole 174A, that is, a load-driven state (described later).

[0093] In this case, as described above, the controller 260 drives the motor 210 to rotate at a predetermined first speed R1. However, since the first speed R1 is set to a relatively low speed range, the driving speed of the vibration damping mechanism 177 is also in the relatively low speed range, and unnecessary vibrations generated in the impact tool 100 via the vibration damping mechanism 177 are kept to a minimum. In this embodiment, with regard to this state, the mode in which the motor 210 is driven at the first speed R1, which is a relatively low speed in the no-load driving state, is defined as a "soft no-load start." The soft no-load start is an operating mode in which the motor 210 is rotated at a low speed in a state in which the generation of vibration by the vibration suppression mechanism 177 is minimized, thereby improving the response characteristics to the subsequent normal striking operation.

[0094] In this embodiment, R1 is a predetermined value in the relatively low speed range, but it is also possible to set R1 to zero. In other words, it is also possible to select a setting that does not rotate and drive the motor 210 in the no-load driving state. In this case, instead of the rise characteristic from the no-load driving state to the driving state, the setting is one that emphasizes the energy saving effect and vibration suppression in the no-load driving state.

[0095] When the impact tool 100 is placed in an unloaded operating condition, the following characteristics are present: (1) The first elastic body 161 shown in Fig. 7 is in a non-compressed state, that is, in a state in which no biasing force is applied. Then, a clearance 190CL (2 mm in this embodiment) is secured between the bifurcated member 192 of the first sliding guide member 190 and the pressing seat 120C. (2) The second elastic body 162 shown in FIG. 7 is placed in a non-compressed state, that is, in a state in which no biasing force is applied. (3) In the detection mechanism 290 shown in FIG. 19, a clearance 290CL (1 mm in this embodiment) is ensured between the movable member 292 and the duct cover 220.

[0096] (Operation mode 2 of the impact tool 100: switching from unloaded driving state to loaded driving state) In the impact tool 100 in the unloaded driving state described above, when an operator presses the handle 130 downward in the first direction D1D, the second housing 120 integrated with the handle 130 approaches the first housing 110 on the downward D1D side in the first direction. Then, the controller case 270, which is a component of the second housing 120, also moves downward in the first direction D1D, and the second elastic body 162 is compressed via the second elastic body attachment portion 278 shown in FIG. 7. The second elastic body 162 in the compressed state exerts a biasing force on both the first housing 110 and the second housing 120.

[0097] 7, the first elastic body 161 has a clearance 190CL (2 mm) such that the bifurcated member 192 on the second housing 120 side does not reach the pressing seat 120C on the first elastic body 161 side, and the first elastic body 161 is placed in a non-compressed state, i.e., in a state in which no urging force is applied. In other words, the clearance 190CL defines an "initial movement distance" for the first elastic body 161 to be placed in a state in which no urging force is applied and only the second elastic body 162 applies a urging force.

[0098] On the other hand, in the detection mechanism 290 shown in Figure 19, when the second housing 120 moves downward in the first direction D1D, the entire detection mechanism 290 moves downward in the first direction D1D by the amount of clearance 290CL (1 mm) between it and the duct cover 220, and the lower end of the movable member 292 abuts against the duct cover 220. Furthermore, when the second housing 120 moves downward in the first direction D1D, the movable member 292 is pushed by the duct cover 220 (which is moving relatively closer) and moves upward in the first direction D1U while resisting the biasing force of the movable member biasing elastic body 293. The movement of the movable member 292 upward in the first direction D1U cancels the detection of magnetism by the sensor 294. Based on this, the controller 260 detects the pressing of the second housing 120 against the first housing 110 through the detection mechanism 290, and thereby switching from the unloaded drive state to the loaded drive state is performed.

[0099] (Definition of the Load Driving State of the Impact Tool 100) In this embodiment, a state in which the motor 210 is driven and the second housing 120 is pressed against the first housing 110 is defined as a "load driving state." This "load driving state" is (1) A state in which a load other than the weight of the impact tool 100 acts on the tip tool, that is, the tip tool is pressed against a workpiece and driven while a “load” (other than the weight of the impact tool 100) acts on the tip tool. (2) It can also be defined as a state in which both the first elastic body 161 and the second elastic body 162 are compressed, or a state in which at least the second elastic body 162 is compressed and a pressing force is detected by the detection mechanism 290, etc. The load driving state is also called the "load driving state."

[0100] In the load driving state, the controller 260 drives the motor 210 to rotate at a predetermined second speed (second rotation speed) R2 set in a higher speed range than the first speed R1. The second speed R2 is also defined as a normal driving speed for impact work. That is, in this embodiment, based on detection by the detection mechanism 290, the rotation speed of the motor 210 increases (or the motor is switched from a stationary state to a normal rotation state), and the motor is switched from an unloaded driving state to a loaded driving state. In other words, the above-mentioned soft no-load is released (canceled) by the detection by the detection mechanism 290, and a switch to the normal drive pattern is performed. A specific setting value of the second speed R2 is set by comprehensively determining parameters such as the required output and power consumption during normal driving operation (load driving state) of the impact tool 100, which is a large hammer. The switching from the first speed R1 to the second speed R2 can be appropriately set from a mode of switching immediately, a mode of gradually increasing after setting a certain switching time, a mode of increasing in multiple stages, or a combination of these. In this embodiment, a mode is adopted in which the speed is immediately switched from the first speed R1 to the second speed R2 based on detection of pressure.

[0101] (Operational state of the motion conversion mechanism 170 and the impact mechanism 180 in a load-driven state) When the motor 210 is driven to rotate at the second speed R2 under load, the operation of the motion conversion mechanism 170 is substantially the same as when the motor 210 is driven to rotate at the first speed R1 under no load, except for the difference in speed. That is, as shown in Fig. 5 and Fig. 6, the rotation output of the output shaft 213 of the motor 210 around the third direction D3 is transmitted to the first intermediate shaft 171 and the second intermediate shaft 172, and is converted into linear motion in the first direction D1 by the crank mechanism 173, whereby the piston 175 moves linearly in the first direction D1 within the cylinder 174. Similarly, the vibration suppression mechanism 177 mainly composed of the counterweight 178 moves linearly in the first direction D1 on the outer periphery of the cylinder 174.

[0102] When the impact tool 100 is in a load-driving state, the vent hole 174A is in the state shown in FIG. 6, that is, in a state not facing the air chamber 176, and the air chamber 176 is maintained in an airtight state between the piston 175 and the striker 181. Therefore, in the load driving state, the pressure fluctuation in the air chamber 176 caused by the linear motion of the piston 175 in the cylinder 174 causes the striker 181 in the impact mechanism 180 to move linearly, driving the impact bolt 182. As a result, the tip tool (not shown) performs the impact work. This working mode is defined as the hammer mode.

[0103] In this case, as described above, the controller 260 drives the motor 210 to rotate at a predetermined second speed R2, and since the second speed R2 is set to a relatively high speed side, it is possible to carry out an efficient impact operation. In addition, the vibration suppression mechanism 177 is also driven at high speed corresponding to the second speed R2 which is faster than the first speed R1, so that the vibration suppression effect against the relatively large vibration generated on the first housing 110 side in the load driving state is maintained at a high level. In other words, since the vibration can be suppressed firmly according to the impact work, a good working environment is provided.

[0104] (Anti-vibration handle action) In the load driving state, the worker grasps the handle 130 and presses it downward in the first direction D1D to perform the impact operation, but it is anticipated that vibrations will be generated on the first housing 110 side due to the impact mechanism 180 or the impact operation using the tip tool. In this case, the vibration causes a relative movement between the first housing 110 and the second housing 120, and the first elastic body 161 shown in FIG. 7 exerts a biasing force between the first housing 110 and the second housing 120, thereby suppressing the transmission of the vibration from the first housing 110 side to the second housing 120 side as much as possible. As described above, the handle 130 held by the operator, the controller 260 for controlling the drive of the motor 210, various functional members 280 arranged in the controller case 270, the battery mounting section 123, and the battery 150 mounted in the battery mounting section 123 are integrally arranged in the second housing 120. The suppression of the vibration transmission from the first housing 110 to the second housing 120 reduces the burden on the operator, and thoroughly protects the controller 260, the functional members 280, and the battery mounting section 123, which are precision equipment.

[0105] In this embodiment, the movable stroke of the first elastic body 161 is set to 10 mm (ten millimeters). If a strong vibration is input that uses the entire movable stroke, the above-mentioned buffer member 205 and stopper 204 work to suppress adverse effects such as the first housing 110 and the second housing 120 hitting the bottom (see FIG. 7).

[0106] When the vibration isolation function is working under load driving, to be precise, (1) The first elastic body 161 exerts a biasing force, (2) The second elastic body 162, which is compressed by the pressure of the operator, also exerts a biasing force. Let it act, (3) Movable member biasing elastic body 293 compressed by the pressure of the operator (See Figure 20, etc.) also exerts a biasing force. Each of these biasing forces (1), (2), and (3) acts between the first housing 110 and the second housing 120. However, as described above, the elastic constant of the second elastic body 162 is set to a relatively small value, and furthermore, the elastic constant of the movable member biasing elastic body 293 is set to a minimum value sufficient to provide a biasing force for returning the movable member 292 to its initial position (see FIG. 19). Therefore, in this embodiment, the first elastic body 161 capable of exerting a strong elastic force plays a major role in the vibration isolation function.

[0107] For example, when using a single elastic body to simultaneously perform functions of detecting pressure for switching from a no-load driving state to a loaded driving state and vibration isolation between the first housing 110 and the second housing 120, increasing the elastic constant is effective for vibration isolation but results in the required pressing force setting by the operator becoming too high. Conversely, decreasing the elastic constant allows the required pressing force setting by the operator to be optimized but reduces the vibration isolation effect. In this embodiment, the "initial action" elastic body (i.e., second elastic body 162) for releasing the soft no-load and the elastic body for vibration damping (i.e., first elastic body 161) are provided separately and optimized for their respective uses, so that such problems do not occur.

[0108] (Functions of the First Sliding Guide Member 190 and the Second Sliding Guide Member 200) In the impact tool 100 according to this embodiment, (1) As shown in FIG. 7, the relative movement between the first housing 110 and the second housing 120 is slidably guided at multiple points in the first direction D1 using a first sliding guide member 190 and a second sliding guide member 200, thereby ensuring stable operation. (2) As shown in FIG. 7, the first elastic body 161, which plays a main role in the vibration-damping mechanism, is positioned between the first sliding guide member 190 and the second sliding guide member 200 in the first direction D1, thereby providing a stable vibration-damping effect. (3) As shown in FIGS. 8 and 9, by arranging a plurality of first sliding guide members 190 and a plurality of second sliding guide members 200 around the first direction D1, more stable operation can be ensured. (4) For each component of the first sliding guide member 190 and the second sliding guide member 200, a metal pipe-shaped member 191 having excellent rigidity and a sliding guide 203 made of sheet metal are used, while a resin material is used for the member that pairs with such a high-rigidity member (such as the bifurcated member 192), thereby achieving both strength and light weight. (5) The first sliding guide member 190 and the second sliding guide member 200 not only provide sliding guidance, but also the stopper 204 determines the maximum movable distance of the relative movement. Furthermore, the buffer member 205 continuously buffers the relative movement from a state in which the relative movement has occurred a predetermined distance less than the maximum movable distance to the maximum movable distance, thereby constructing a rational vibration-proof structure. In addition, the stopper 204 and the buffer member 205 can be arranged in at least one of the first sliding guide 190 and the second sliding guide 200, or arranged separately (independently) from the first sliding guide 190 and the second sliding guide 200.

[0109] (Characteristics regarding battery attachment, etc.) As described above, in the impact tool 100 according to this embodiment, as shown in Figs. 4 to 7 and the like, the output shaft 213, which is likely to be the largest in the motor 210, is disposed to extend in the third direction D3, which is the thickness direction of the impact tool 100. The large-dimension portion of the motor 210 is allocated along the third direction D3, and instead, a large space formed for arranging other functional components along the second direction D2, which is the width direction of the impact tool 100, is secured as the expansion space S. That is, as shown in Figs. 1 and 4, a relatively large space for other functional components is secured in the side region 114 of the first housing 110 in the second direction D2. In this embodiment, this makes it possible to place the battery 150, which is relatively heavy, as close as possible to the center of gravity of the impact tool 100 (located on the central axis along the first direction D1) in the second direction D2, thereby significantly suppressing the generation of unnecessary couple forces in the impact tool 100.

[0110] In addition, since the battery mounting direction 156 is set to follow the third direction D3 (see FIG. 3), when the battery 150 is mounted in the battery mounting section 123, the expansion space S can be utilized to perform the mounting work in a large space, thereby improving workability. Furthermore, by setting the battery attachment direction 156 to be along the third direction D3, the battery attachment direction 156 can be made to intersect with the first direction D1, in which vibrations are likely to occur during impact work, and this makes it possible to prevent malfunctions such as the battery 150 being suddenly detached due to an unexpected external force acting on the battery 150 due to vibrations.

[0111] Furthermore, as shown in FIG. 1 etc., by setting a pair of battery attachment portions 123 in the area 130A directly below the handle 130, the operator can hold the handle 130 with one hand and use the other hand to attach the opposing battery 150, then switch the hands holding the handle 130 and, while holding the handle 130 with the other hand, attach the opposing battery 150, thereby improving the coordination between holding the handle 130 and attaching the battery 150.

[0112] (Characteristics of detection reliability, etc. in detection mechanism 290) In this embodiment, as shown in Figures 10 to 13, 18 to 20, etc., a configuration is adopted in which the detection mechanism 290 is integrally attached as an assembly to the controller case 270, which is a component member on the second housing 120 side, via the detection mechanism mounting portion 274. The detection mechanism 290 is a member for detecting the relative movement between the first housing 110 and the second housing 120. Generally, the components are provided in both the first housing 110 and the second housing 120, but in this embodiment, the detection mechanism 290 is provided in the second housing 120, and the duct cover 220, which is an existing component of the first housing 110, is made to function as the working medium of the movable member 292.

[0113] Therefore, each component of detection mechanism 290 can be disposed integrally on first housing 110 side as an assembly, which makes it possible to reduce the risk of malfunctions caused by assembly errors of each component, and ultimately unreliable detection. In addition, as shown in Figures 19 and 20, by forming a clearance 290CL between the movable member 292 and the duct cover 220, which is the working medium of the movable member 292, assembly errors between the first housing 110 and the second housing 120, etc. can be absorbed, thereby reducing the risk of malfunctions and ultimately unreliable detection.

[0114] As described above, the detection mechanism 290 constitutes a mechanism for releasing the soft no-load and switching to the load driving state. However, during impact work, there may be cases where the pressing force temporarily decreases due to accidental circumstances such as a change in the gripping posture of the operator or a change in the orientation of the impact tool 100 (the inclination angle with respect to the first direction D1). In such a case, it would be rather inconvenient to switch from the loaded driving state to the soft no-load state each time the pressing force is reduced, so in this embodiment, even if the pressing force is reduced in the loaded driving state, the loaded driving state is maintained without switching to the soft no-load state until a certain time has elapsed (for example, 1 second). This further improves the convenience during impact work.

[0115] Furthermore, it is generally conceivable to detect the pressing force based on, for example, a change in the load current of the motor, release the soft no-load, and switch to the loaded driving state, but in the case of a large hammer characterized by a large output, for example, the load current varies depending on the material or type of the object of the striking work, and there is a concern that the pressing force may not be detected accurately. In this embodiment, a configuration is adopted in which the pressing force is detected using a mechanical detection mechanism, namely the movable member 292 biased by the movable member biasing elastic body 293, so that the reliability of detection is guaranteed.

[0116] (Characteristics of Controller Case 270) In the impact tool 100 according to this embodiment, a controller 260 for controlling the motor drive is held in a controller case 270, as shown in FIGS. The controller case 270 according to this embodiment has the following features, for example. (1) Since the configuration holds not only the controller 260 but also various functional components 280, the device configuration and assembly are streamlined and simplified, which contributes to making the entire configuration compact. (2) The main body is frame 271, which has a lightweight and highly rigid structure. (3) By being disposed in second housing 120, which is the vibration-proof side, a vibration-proof structure is achieved against vibrations occurring in first housing 110. (4) By disposing the motor 210 in the area directly above the motor 210, it is easy to route the wire harness (wiring) to the motor 210. (5) By being positioned on the center line in the first direction D1 of the impact tool 100, the wire harness (wiring) can be arranged symmetrically in both the second direction (width direction) D2 and the third direction (thickness direction) D3, thereby facilitating design and assembly. (6) As described above, in this embodiment, a brushless motor that can be easily miniaturized while maintaining high output is used as motor 210, and its output shaft 213 extends along third direction D3 to form expansion space S in side region 114. By arranging controller case 270 in the region directly above motor 210, the expansion space S can be easily used for arranging a wire harness, etc., making it possible to utilize the internal space with high efficiency.

[0117] (Cooling characteristics for motors, controllers, etc.) In the impact tool 100 according to this embodiment, the cooling air supply route to the parts requiring cooling is, as described above, via the axial flow action of the cooling fan 214 of the motor 210, "air is taken in from the cooling air intake port 127" - "air flows through the inside of the head case 121" - "air cools the controller 260" - "first end 232 of the duct hose 231" - "inside the duct hose 231" - "second end 233 of the duct hose 231" - "duct cover 220" - "inside the motor housing 215", and cooling is performed in the following order: controller 260, motor 210. Furthermore, the cooling air that has cooled the motor 210 passes through the "upper drive mechanism accommodating portion 111"-"lower drive mechanism accommodating portion 112" in the first housing 110, cools the motion conversion mechanism 170 and (part of) the impact mechanism 180, and is then discharged to the outside of the impact tool 100. For convenience, detailed illustration of the cooling air passages and the like downstream of the motor 210 is omitted.

[0118] Furthermore, in the impact tool 100 according to this embodiment, the following points can be given as examples of characteristics related to the cooling performance of the components. (1) Duct hose 231 is arranged between first housing 110 and second housing 120 in a state in which a biasing force acts toward the contraction side so that duct hose 231 returns to its initial state when it is stretched from a predetermined initial state, and is connected to first housing 110 and second housing 120 in a state in which duct hose 231 is stretched a predetermined amount from its initial state. This allows duct hose 231 to be in a state in which a biasing force is constantly acting toward the contraction side so that duct hose 231 returns to its initial state. Therefore, even if first housing 110 and second housing 120 move relative to each other, duct hose 231 does not loosen and come into contact with other members and become worn, and excessive tension, twisting, and the like are unlikely to occur, so that cooling air can be effectively transferred between members that move relative to each other.

[0119] (2) As shown in Figures 11, 16 and 17, the cross sections of first end 232 and second end 233 intersect with each other. This makes it easier to avoid twisting of duct hose 231 and application of unnecessary tension when first housing 110 and second housing 120 move relative to each other, as in (1) above.

[0120] (3) As shown in Fig. 16, first end 232 and second end 233 of duct hose 231 are directly fitted and attached to duct member mounting portion 272 of controller case 270 and duct member mounting portion 225 of the duct cover, respectively. In other words, by adopting a structure without an adapter, the device configuration can be simplified.

[0121] (4) As shown in FIG. 16, first end 232 of duct hose 231 is located in the vicinity of the upper area of ​​cooling fan 214 of motor 210. This makes it possible to prevent duct hose 231 from being unnecessarily long and to easily avoid a problem in which duct hose 231 is too short and unnecessary tension is applied thereto.

[0122] 16, cooling air intake port 127A is provided at least in correspondence with the end of controller case 270 on the side opposite duct member attachment portion 272. Furthermore, in this embodiment, cooling air intake port 127 is provided over the entire upper surface of head case 121. This allows the cooling air drawn into impact tool 100 to cool controller 260 over the entire surface, improving cooling efficiency.

[0123] (6) As shown in Fig. 11, the duct hose 231 is placed in a state in which the curved shape of the approximate center is maintained by the duct portion guide rib 116 of the motor housing 215. As a result, even if the first housing 110 and the second housing 120 move relative to each other, the mounting shape (approximately L-shaped) of the duct hose 231 is maintained, making it easier to prevent the duct hose 231 from twisting or applying unnecessary tension.

[0124] As described above, according to this embodiment, a construction technology is provided that contributes to streamlining the component arrangement and operability of the impact tool 100, which is normally used in a working state in which it performs impact work in a downward facing position due to its own weight. [Explanation of symbols]

[0125] 100: Impact tools 110: First housing (main body) 111: Upper drive mechanism housing 112: Lower drive mechanism housing 113: Tip area 114: Lateral area 115: Motor housing 116: Duct guide rib 120: Second housing (main body) 120A: First elastic body mounting seat 120B: Second elastic body mounting seat 120C: Pressing seat 121: Head case 122: Handle attachment part 123: Battery mounting section 124: Slide guide 125: Power supply terminal 126:Buffer member abutment seat 127: Cooling air intake 128: Battery protector 129;LED light 130: Handle 131: First handle part (handle R) 132: First handle base 133: First handle gripping portion 134: Free end area 135: Trigger 136: Electric switch 141; Second handle (handle L) 142: Second handle base 143: Second handle gripping portion 144: Free end area 130A: Area directly below the handlebars 150: Battery 151: Battery front 152: Top of battery 153: Bottom of battery 154: Rear of battery 155: Unlocking section 156: Battery installation direction 161: First elastic body 162: Second elastic body 170:Movement conversion mechanism 171: First intermediate shaft 172: Second intermediate shaft 173: Crank mechanism 174: Cylinder 174A: Ventilation hole 175: Piston 176: Air chamber 177: Vibration control mechanism 178: Counterweight 180: Impact mechanism 181: Striker 182: Impact bolt 190: First sliding guide member (handle-proximal side sliding guide member) 191: Pipe-shaped member (first housing side component) 192: Bifurcated member (second housing side component) 190CL: Clearance 200: Second sliding guide member (handle-separating side sliding guide member) 201: Convex member 202: Concave member 203: Sheet metal sliding guide 204: Stopper 205: Cushioning material 210: Motor 211: Stator 212:Rotor 213: Output shaft 214: Cooling fan 215: Motor housing 220: Duct cover 221:Interior space 222: Motor mounting seat 223: Flange 224: Cooling air guideway 225: Duct component mounting part 230: Duct parts 231: Duct hose 232: First end 233:Second end 240: Tool holder 250: Retainer 260: Controller 261: Heat dissipation fin 270: Controller case 271: Frame 272: Duct component mounting part 273: Head case mounting part 274: Detection mechanism mounting part 275: Main power switch mounting part 276: Communication unit mounting part 277: Wire harness insertion opening 278: Second elastic body mounting part 280: Functional materials 281: Main power switch 282: Communication unit 290:Detection mechanism 291: Assembly base 292: Movable parts 293: Movable member biasing elastic body 294: Sensor 290CL: Clearance D1: 1st direction (long axis direction) D1D: 1st direction downward D1U: 1st direction upward D2: Second direction (width direction) D3: Third direction (thickness direction) AX: Long axis HL: Virtual line MS: Initial Distance S: Expansion space

Claims

1. An impact tool comprising: an elongated main body portion having a tool holder at a tip region; and a pair of handles extending in a second direction, where a longitudinal direction of the main body portion is defined as a first direction and a width direction intersecting the first direction is defined as a second direction, wherein an impact operation is performed via a tool tip removably attached to the tool holder while an operator holds the pair of handles with the left and right hands, respectively, and is suspended by its own weight, a drive mechanism that drives the tool bit in the first direction; a motor having a motor output shaft for driving the drive mechanism; A controller that drives and controls the motor; A predetermined functional member that performs the impact work; a controller case for holding the controller; The controller case has a shape and size that fits the controller, and is characterized by having a frame that partially houses the controller, and a functional member mounting portion that protrudes outward from the frame and to which the functional member is attached.

2. An impact tool having a long body portion with a tool holder at a tip region, and a pair of handles extending in a second direction, where the longitudinal direction of the body portion is defined as a first direction and a width direction intersecting the first direction is defined as a second direction, wherein an operator holds the pair of handles in each hand and is suspended by its own weight, and an impact operation is performed via a tip tool detachably attached to the tool holder, a drive mechanism that drives the tool bit in the first direction; a motor having a motor output shaft for driving the drive mechanism; A controller that drives and controls the motor; A predetermined functional member that performs the impact work; a controller case for holding the controller; a first housing and a second housing which are components of the main body; an elastic body interposed between the first housing and the second housing; the controller case is further configured to hold the functional member; the drive mechanism and the motor are provided in the first housing, the pair of handles and the controller case are provided in the second housing, the second housing is configured to be movable relative to the first housing together with the pair of handles via the elastic body, The impact tool further includes a duct member that transports cooling air between the first housing and the second housing. The impact tool, wherein the functional member includes the duct member.

3. An impact tool having a long body portion with a tool holder at a tip region, and a pair of handles extending in a second direction, where the longitudinal direction of the body portion is defined as a first direction and a width direction intersecting the first direction is defined as a second direction, wherein an operator holds the pair of handles in each hand and is suspended by its own weight, and an impact operation is performed via a tip tool detachably attached to the tool holder, a drive mechanism that drives the tool bit in the first direction; a motor having a motor output shaft for driving the drive mechanism; A controller that drives and controls the motor; A predetermined functional member that performs the impact work; a controller case for holding the controller; a first housing and a second housing which are components of the main body; an elastic body interposed between the first housing and the second housing; the controller case is further configured to hold the functional member; the drive mechanism and the motor are provided in the first housing, the pair of handles and the controller case are provided in the second housing, the second housing is configured to be movable relative to the first housing together with the pair of handles via the elastic body, the controller case has an elastic body attachment portion for attaching the elastic body, The impact tool, wherein the functional member has as a component thereof the elastic body that is attached to the controller case via the elastic body attachment portion.

4. 4. The impact tool according to claim 1, wherein the controller case is provided at a position including a major axis of the main body in the first direction.

5. 5. An impact tool according to claim 1, characterized in that, when the first direction is defined as a direction from the handle to the tool holder being downward and a direction from the tool holder to the handle being upward, the controller case is provided above the motor.

6. An impact tool according to any one of claims 1 to 5, a first housing and a second housing which are components of the main body; an elastic body interposed between the first housing and the second housing; the drive mechanism and the motor are provided in the first housing, the pair of handles and the controller case are provided in the second housing, the second housing is configured to be movable relative to the first housing together with the pair of handles via the elastic body, the functional member includes a detection mechanism for detecting a relative movement of the second housing with respect to the first housing when an operator presses the handle to start a striking operation, The controller is configured to drive the motor at a predetermined first speed in an unloaded driving state defined as a state in which the second housing is not pressed against the first housing, and to switch the motor from a driving state at the first speed to a driving state at a second speed faster than the first speed based on detection by the detection mechanism.

7. 7. An impact tool according to claim 1, wherein the functional member has as a component a wire harness insertion opening formed in the controller case for holding a lead wire connected to the controller.

8. 8. The impact tool according to claim 1, further comprising a main power switch for controlling the motor by the controller, The impact tool, wherein the functional member includes the main power switch as a component thereof.

9. 9. The impact tool according to claim 1, further comprising: an attachment member that is used together with the impact tool in a work; and a communication unit that transmits a drive control signal to the attachment member, The impact tool, wherein the functional member includes the communication unit as a component thereof.

10. 8. The impact tool according to claim 1, further comprising: a main power switch for controlling the drive of the motor by the controller; an attachment member used for work together with the impact tool; and a communication unit for transmitting a drive control signal to the attachment member, An impact tool, characterized in that the functional member has as its components the main power switch and the communication unit, and the main power switch and the communication unit are provided adjacent to each other on the main body.

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