Impact rotary tool

Abstract

The purpose of this disclosure is to suppress the adhesion of abrasive powder generated between the hammer and the anvil to the circuit board. The impact rotary tool (1) includes a motor (11), a hammer (12), an anvil (13), a sensor (14), a circuit board (15), and an isolation section (10). The hammer (12) is configured to receive a rotational force about an axis from the motor (11) and output a striking rotational force obtained by converting a portion of the rotational force into a striking force about the axis. The anvil (13), which is mounted on the front end tool (2), is configured to rotate about an axis together with the front end tool (2) in response to the striking rotational force received from the hammer (12). The sensor (14) is arranged near the anvil (13) and is configured to sense changes in the state of the anvil (13) according to the striking rotational force. The circuit board (15) is configured to receive the sensing results of the sensor (14). The isolation section (10) isolates the contact portions (12a and 13b) of the hammer (12) and the anvil (13) from the circuit board (15) at least.

Description

Technical Field

[0001] This disclosure relates to an impact rotary tool, and more particularly to an impact rotary tool comprising a hammer, an anvil, a sensor arranged near the anvil, and a circuit board to which the output of the sensor is fed. Background Technology

[0002] JP 2021-070108A (Document 1) discloses a power tool including a motor, an impact mechanism (hammer), an output shaft (anvil), a torque measuring unit (sensor), a fastening torque calculation unit, and a controller (circuit board). The impact mechanism receives rotational force from the motor and applies an impact force, obtained by converting a portion of the rotational force into a pulsed rotational force, to the output shaft. The torque measuring unit measures the torque applied to the output shaft based on the strain caused by the impact force. The fastening torque calculation unit calculates the fastening torque applied from the output shaft to the fastening member via a front-end tool based on the measured torque. The controller controls the motor according to the calculated fastening torque. Summary of the Invention

[0003] The problem the invention aims to solve

[0004] In impact rotary tools with the structure described above, the striking force (impact) typically generates abrasive powder at the contact point between the hammer and the anvil. Conductive abrasive powder adhering to the circuit board can make non-conductive parts conductive, which may destabilize the operation of the impact rotary tool.

[0005] In the power tool described in Reference 1, the fastening torque calculation unit and other components are housed in a housing, thereby suppressing the adhesion of abrasive powder to the fastening torque calculation unit and other components to a certain extent, but further suppression is still needed.

[0006] The purpose of this disclosure is to provide an impact rotary tool in which abrasive powder generated between the hammer and the anvil is prevented from adhering to a circuit board.

[0007] Solution for solving the problem

[0008] An impact rotary tool according to one aspect of this disclosure includes a motor, a hammer, an anvil, a sensor, a circuit board, and an isolator. The hammer is configured to receive a rotational force about an axis from the motor and output a striking rotational force. The striking rotational force is obtained by converting a portion of the rotational force into an impact force about the axis. The anvil, for mounting to a front-end tool, is configured to rotate about an axis together with the front-end tool in response to the striking rotational force received from the hammer. The sensor is arranged near the anvil and configured to sense changes in the state of the anvil according to the striking rotational force. The circuit board is configured to receive the sensing results from the sensor. The isolator is configured to isolate the contact portions of the hammer and anvil from the circuit board at least.

[0009] The effects of the invention

[0010] The impact rotary tool disclosed herein has the effect of suppressing the adhesion of abrasive powder generated between the hammer and the anvil to the circuit board. Attached Figure Description

[0011] Figure 1 This is an external view of an impact rotary tool according to an embodiment of the present disclosure;

[0012] Figure 2 It is a cross-sectional view of an impact rotary tool;

[0013] Figure 3 This is a side view of the impact rotary tool with the first housing removed;

[0014] Figure 4 This is an exploded perspective view of the impact rotating tool with the second housing removed;

[0015] Figure 5 This is a detailed view of the interior of the sensor in the impact rotary tool;

[0016] Figure 6 This is a side view of the impact rotary tool with the third housing removed; and

[0017] Figure 7A This is a schematic diagram of an impact rotary tool. Figure 7B This is a schematic diagram of the first variant of an impact rotary tool. Figure 7C This is a schematic diagram of the second variant of the impact rotary tool. Detailed Implementation

[0018] The accompanying drawings described in the following embodiments are schematic diagrams, and the size and thickness ratios of the components do not necessarily reflect actual size ratios. Note that the constructions described in the following embodiments are merely examples of this disclosure. This disclosure is not limited to the following embodiments, and various modifications can be made based on design, etc., as long as the effects of this disclosure are achieved.

[0019] (1) Overview

[0020] like Figures 1 to 4 and Figure 7A As shown, the impact rotation tool 1 according to an embodiment of the present disclosure includes a motor 11, a hammer 12, an anvil 13, a sensor 14, a circuit board 15, and an isolation section 10.

[0021] (1-1) Motor, hammer and anvil

[0022] Motor 11 is supplied with power from battery 16 (described later) and generates a rotational force about axis 200. Hammer 12 receives the rotational force about axis 200 from motor 11 and outputs a striking rotational force. The striking rotational force is obtained by converting a portion of the rotational force from motor 11 into a striking force (pulsating impact force) about axis 200. Anvil 13, which is mounted on the front tool 2, rotates about axis 200 together with the front tool 2 in response to the striking rotational force received from hammer 12.

[0023] (1-2) Sensors

[0024] Sensor 14 is arranged near anvil 13 and senses the state changes of anvil 13 according to the striking rotational force generated by hammer 12.

[0025] In this embodiment, sensor 14 is a magnetostrictive sensor. A magnetostrictive sensor is a sensor configured to magnetically sense the strain of an object (anvil 13 in this embodiment), which will be described in detail later.

[0026] However, sensor 14 can be a strain sensor other than a magnetostrictive sensor (e.g., a strain gauge configured to electrically sense strain). Sensor 14 can be a sensor other than a strain sensor (e.g., an acceleration sensor).

[0027] In this embodiment, the state change to be sensed is the strain change of the anvil 13. Alternatively, the state change can be a change other than strain (e.g., the change in the angular velocity of the anvil 13 about axis 200).

[0028] (1-3) Circuit Board

[0029] The circuit board 15 receives the sensing results from the sensor 14.

[0030] In this embodiment, sensor 14 and circuit board 15 are electrically connected to each other via lead 14c. Alternatively, sensor 14 and circuit board 15 can be connected to each other to enable near-field communication, for example, between them.

[0031] The circuit board 15 in this embodiment includes an amplification circuit 15a and a processing circuit 15b. The amplification circuit 15a amplifies the signal indicating the sensing result of the sensor 14 (e.g., a voltage signal from the coil included in the magnetostrictive sensor). The processing circuit 15b performs processing on the voltage signal amplified by the amplification circuit 15a (e.g., converting it into a strain signal and calculating based on the strain to determine the tightening torque).

[0032] Note that the voltage signal can be amplified and converted into a strain signal in sensor 14, and circuit board 15 can perform only the calculation of the tightening torque based on the strain.

[0033] (1-4) Isolation Department

[0034] The isolation section 10 isolates the contact portions of the hammer 12 and the anvil 13 from the circuit board 15 at least.

[0035] The contact portion between the hammer 12 and the anvil 13 is: the portion that acts as part of the anvil 13 and is subject to the striking rotational force from the hammer 12; and the portion that acts as part of the hammer 12 and is subject to the reaction force from the anvil 13.

[0036] The portion of the anvil 13 subjected to the striking rotational force from the hammer 12 is the end (rear end: e.g., anvil claw 13b) located on the opposite side of the end (front end 13a) to which the front end tool 2 is mounted. The portion of the hammer 12 subjected to the reaction force from the anvil 13 is the portion that contacts the rear end of the anvil 13 (e.g., the hammer claw 12a to be fitted into the anvil claw 13b).

[0037] That is, the contact portion of the hammer 12 and the anvil 13 is, for example, the hammer claw 12a and the anvil claw 13b, and is referred to as the contact portion (12a and 13b) below.

[0038] In this way, by isolating the contact portions (12a and 13b) that serve as the source of abrasive powder from the circuit board 15 through the isolation section 10, the adhesion of abrasive powder to the circuit board 15 can be suppressed.

[0039] (1-4-1) Shell

[0040] In this embodiment, the isolation portion 10 is a housing 101. As used herein, the housing 101 is a component that at least covers the contact portions (12a and 13b). The circuit board 15 is arranged outside the housing 101.

[0041] In other words, housing 101 only encloses the space where the contact portions (12a and 13b) are located (hereinafter referred to as the first space S1), but housing 101 does not enclose the space where the circuit board 15 is located (hereinafter referred to as the second space S2). Therefore, the contact portions (12a and 13b) are at least isolated from the circuit board 15.

[0042] In this way, by using the housing 101 to cover the abrasive powder source to confine the abrasive powder within the housing 101, it is possible to prevent the abrasive powder from adhering to the circuit board 15 arranged outside the housing 101.

[0043] In the impact rotary tool 1, the motor 11 is typically also located outside the housing 101. The impact rotary tool 1 in this embodiment also includes a battery 16, a control circuit 17, and a wireless communication circuit 18 (described later), and these components are also located outside the housing 101.

[0044] In other words, the housing 101 only surrounds the first space S1, but not the second space S2, nor the space where the motor 11 is located (hereinafter referred to as the third space S3). In this embodiment, the third space S3 also contains the battery 16, the control circuit 17, and the wireless communication circuit 18.

[0045] Thus, the contact portions (12a and 13b) are isolated not only from the circuit board 15, but also from the motor 11, battery 16, control circuit 17, wireless communication circuit 18, and other components.

[0046] In this embodiment, the contact portions (12a, 13b) that serve as the source of abrasive powder are covered by a housing 101 (for example, the first housing 101 described later) which is an isolation portion 10, thereby confining the abrasive powder within the housing 101 and thus preventing the abrasive powder from adhering to the circuit board 15 arranged outside the housing 101.

[0047] In the power tool described in Document 1, a cover is used to cover the tightening torque calculation unit and other components corresponding to the circuit board 15. However, in this case, the effect of suppressing abrasive powder adhesion only extends to the tightening torque calculation unit and other components. In contrast, when the abrasive powder source is isolated by covering it with the housing 101 as in this embodiment, the effect of suppressing abrasive powder adhesion also extends to circuits outside the circuit board 15 (e.g., control circuit 17 and wireless communication circuit 18).

[0048] (1-4-2)Wall

[0049] The isolation section 10 may be a wall 10a. As used herein, the wall 10a is a component that divides the space containing the contact portions (12a and 13b) and the processing circuit 15b (hereinafter referred to as the fourth space S4) into a first space S1 containing the contact portions (12a and 13b) and a second space S2 containing the processing circuit 15b (see [link to documentation]). Figure 7C Note that wall 10a will be described in the second variant.

[0050] In this case, by isolating the contact portions (12a and 13b) from the circuit board 15 by using a wall 10a, which is another type of isolation section 10, it is possible to suppress the adhesion of abrasive powder to the circuit board 15.

[0051] (2) Details

[0052] In addition to the aforementioned six components (10 to 15), the impact rotary tool 1 also includes, as well as... Figure 2 and Figure 6 The battery 16, control circuit 17, and wireless communication circuit 18 are shown.

[0053] Battery 16 supplies power to motor 11. Control circuit 17 controls motor 11 based on, for example, the processing result of processing circuit 15b. Wireless communication circuit 18 communicates wirelessly with external devices (not shown).

[0054] In this embodiment, the isolation part 10 is the housing 101, specifically the first housing 101.

[0055] (2-1) First shell

[0056] The first housing 101 at least covers the contact portions (12a and 13b) between the hammer 12 and the anvil 13. A circuit board 15 is disposed outside the first housing 101. In this embodiment, the circuit board 15 is disposed inside the second housing 102 (described later), but this is not a limited example.

[0057] The first housing 101 only surrounds the first space S1 where the contact portions (12a and 13b) are located, but does not surround the second space S2 where the circuit board 15 is located.

[0058] In the impact rotation tool 1 of this embodiment, for example, Figure 2 and Figure 7A As shown, the hammer 12, the anvil 13 (excluding the front end 13a where the front end tool 2 is to be installed), and the sensor 14 are located in the first space S1. Therefore, the first housing 101 covers most of the hammer 12, the anvil 13, and the sensor 14. Note that although in Figure 2 The hammer 12 is completely covered by the first housing 101, but it is also possible that only a part of the hammer 12 is covered by the first housing 101.

[0059] Thus, by using the first housing 101 to cover most of the hammer 12 and most of the anvil 13, which serve as the source of abrasive powder, as well as the sensor 14 near the anvil 13, it is possible to suppress the adhesion of abrasive powder to the circuit board 15 arranged outside the housing 101, while protecting the hammer 12, anvil 13, and sensor 14.

[0060] (2-2) Second shell

[0061] For example, such as Figure 1 and Figure 4 As shown, the impact rotary tool 1 also includes a second housing 102. The second housing 102 is disposed outside the first housing 101 and covers the circuit board 15.

[0062] The second housing 102 surrounds the second space S2 where the circuit board 15 is located. In this embodiment, only the circuit board 15 exists in the second space S2, but other components besides the circuit board 15 may also exist there.

[0063] For example, such as Figure 4 and Figure 7AAs shown, the second housing 102 in this embodiment has an open main surface 102c. On the open side of the main surface 102c, the second housing 102 is fixed to the outer surface 101b of the first housing 101 in a state where the circuit board 15 is housed.

[0064] Specifically, such as Figure 4 As shown, the impact rotating tool 1 also includes four screws 102b, four screw holes 101a are formed in the outer surface 101b of the first housing 101, and four through holes 102a are formed in the second housing 102.

[0065] For example, such as Figure 2 As shown, the circuit board 15 is arranged on the outer surface 101b of the first housing 101 and is connected to the sensor 14 in the first housing 101 via the lead 14c.

[0066] Four screws 102b are inserted through four through holes 102a in the second housing 102 and fastened into four screw holes 101a formed in the outer surface 101b of the first housing 101. In this way, the second housing 102 is fixed to the outer surface 101b of the first housing 101 on the open side of the main surface 102c.

[0067] In this embodiment, four screws 102b enable the second housing 102 to be mounted to and removed from the outer surface 101b of the first housing 101. Alternatively, the second housing 102 can be fixed to the outer surface 101b of the first housing 101 using adhesives or the like.

[0068] In this embodiment, in addition to using the first housing 101 to cover most of the hammer 12, most of the anvil 13, and the sensor 14 near the anvil 13, using the second housing 102 to cover the circuit board 15 as described above can more effectively suppress the adhesion of abrasive powder to the circuit board 15.

[0069] Note that the main surface 102c of the second housing 102 need not be open (see first variant). Furthermore, the second housing 102 may also cover the first housing 101 outside of the circuit board 15 (see other variants).

[0070] (2-3) Circuit board

[0071] (2-3-1) Circuit board layout

[0072] The circuit board 15 is fixed to the outer surface 101b of the first housing 101.

[0073] The circuit board 15 is fixed to the outer surface 101b of the first housing 101 by, for example, a second housing 102.

[0074] As described above, in this embodiment, the main surface 102c of the second housing 102 is open, and the circuit board 15 is directly fixed to the outer surface 101b of the first housing 101 while being housed in the second housing 102. For example, as Figure 4 and Figure 7A As shown.

[0075] Specifically, the circuit board 15 is disposed on the outer surface 101b of the first housing 101, and the second housing 102 is fixed to the outer surface 101b of the first housing 101 at the open main surface 102c in a manner that covers the circuit board 15. That is, the circuit board 15 is sandwiched between the outer surface 101b of the first housing 101 and the inner surface 102d of the second housing 102, thereby being fixed to the outer surface 101b of the first housing 101.

[0076] Therefore, in this embodiment, the second housing 102 enables the circuit board 15 to be directly fixed to the first housing 101 and can suppress the adhesion of abrasive powder to the circuit board 15.

[0077] Furthermore, fixing the circuit board 15 to the outer surface 101b of the housing 101 allows for a shorter distance between the sensor 14 and the circuit board 15. In this embodiment, the sensor 14 and the circuit board 15 are connected to each other via a lead 14c, thereby shortening the length of the lead 14c.

[0078] Additionally, fixing the circuit board 15 to the outer surface 101b of the first housing 101 causes the sensor 14 in the first housing 101 and the circuit board 15 on the outer surface 101b of the first housing 101 to vibrate together with the first housing 101 in response to the striking rotational force from the hammer 12, which can suppress tension caused at the lead wire 14c.

[0079] The connection between sensor 14 and circuit board 15 is not limited to a wired connection via lead 14c, but can also be a wireless connection. In this case, the wireless communication distance is shortened.

[0080] (2-3-2) Circuit Board Construction

[0081] The circuit board 15 includes a processing circuit 15b. The processing circuit 15b processes the sensing results of the sensor 14.

[0082] In this embodiment, the sensor 14 is a magnetostrictive sensor as described above, and the processing circuit 15b processes the voltage signal from the coil 14b (described later) included in the magnetostrictive sensor.

[0083] The circuit board 15 in this embodiment also includes an amplifier circuit 15a. The amplifier circuit 15a amplifies the voltage signal from the coil 14b and sends the amplified voltage signal to the processing circuit 15b. The processing circuit 15b processes the voltage signal amplified by the amplifier circuit 15a.

[0084] Specifically, the processing circuit 15b converts the amplified voltage signal into a strain signal that varies according to the strain.

[0085] In this way, the voltage signal from the coil 14b included in the magnetostrictive sensor 14 is amplified by the circuit board 15, and then the voltage signal is converted into a strain signal so that the strain of the anvil 13 can be magnetically sensed.

[0086] Additionally, the processing circuit 15b performs a calculation to determine the tightening torque based on the strain represented by the strain signal. The tightening torque is the torque generated around the axis 200 and applied from the anvil 13 via the front tool 2 to a fastening member such as a screw.

[0087] The processing result of the processing circuit 15b is sent to the control circuit 17. The connection between the processing circuit 15b and the control circuit 17 is usually wired, but it can also be wireless.

[0088] (2-4) Third shell

[0089] The impact rotating tool 1 also includes a third housing 103.

[0090] The third housing 103 is disposed outside the first housing 101 and outside the second housing 102, and at least covers the motor 11.

[0091] In this embodiment, the third housing 103 surrounds the third space S3 containing the motor 11 and other components. In the impact rotary tool 1, the battery 16, control circuit 17, wireless communication circuit 18, and other components are also located in the third space S3, such as... Figure 2 As shown.

[0092] Thus, the third housing 103 also covers the battery 16, control circuit 17, wireless communication circuit 18, and other components present in the third space S3.

[0093] In this way, by using the third housing 103 to cover the motor 11 and other components, it is possible to prevent abrasive powder generated at the contact portions (12a and 13b) of the hammer 12 and anvil 13 from adhering to the motor 11 and other components.

[0094] Note that, depending on the type of motor 11, friction between the brushes and the commutator may generate abrasive powder, but covering the motor 11 with the third housing 103 can prevent this abrasive powder from adhering to the circuit board 15.

[0095] In this embodiment, the control circuit 17 and the wireless communication circuit 18 are arranged in the third space S3 (in the third housing 103), but at least one of the control circuit 17 or the wireless communication circuit 18 may be arranged in the second space S2 (in the second housing 102). That is, either or both of the control circuit 17 and the wireless communication circuit 18 may be components included in the circuit board 15.

[0096] (2-5) Sensors

[0097] The sensor 14 in this embodiment is a magnetostrictive sensor, and is referred to as "magnetostrictive sensor 14" below. The magnetostrictive sensor 14 magnetically senses the strain of the anvil 13 and outputs a signal corresponding to the sensing result.

[0098] The magnetostrictive sensor 14 includes, for example, a magnetostrictive film 14a and a coil 14b, such as Figure 5 As shown. A magnetostrictive membrane 14a is disposed on at least a portion of the outer peripheral surface 13c of the anvil 13, and a coil 14b surrounds the magnetostrictive membrane 14a.

[0099] In this embodiment, such as Figure 2 As shown, the magnetostrictive film 14a is formed slightly rearward on the outer peripheral surface 13c of the anvil 13 (on the anvil claw 13b side) over a range of approximately 1 / 3 to 1 / 4 of the length of the anvil 13.

[0100] A magnetostrictive film 14a is formed, for example, by thermally spraying a magnetostrictive material such as ferrite onto an anvil 13. Note that there are no particular limitations on the type of magnetic material or the method of forming the magnetostrictive film 14a.

[0101] When the anvil 13 receives the striking rotational force from the hammer 12 and thus generates strain, the anvil 13 applies its stress to the magnetostrictive membrane 14a, thereby changing the permeability of the magnetostrictive membrane 14a. As the permeability of the magnetostrictive membrane 14a changes, the inverse magnetostrictive effect alters the impedance of the coil 14b. The coil 14b outputs a voltage signal according to this impedance change.

[0102] As described above, the voltage signal from coil 14b is fed to circuit board 15, amplified by amplifier circuit 15a, and then converted into a strain signal by processing circuit 15b.

[0103] In this way, the voltage signal from the coil 14b included in the magnetostrictive sensor 14 is amplified and then converted into a strain signal by the circuit board 15, which enables the strain of the anvil 13 to be magnetically sensed.

[0104] In addition, the processing circuit 15b also performs calculations to determine the tightening torque based on strain. The tightening torque is the torque generated around axis 200 and applied from anvil 13 via front tool 2 to a fastening member such as a screw.

[0105] In this way, calculations are performed via circuit board 15, enabling the calculation of the tightening torque applied by the front tool 2 mounted on anvil 13 based on the strain of anvil 13.

[0106] (3) First variant

[0107] In the impact rotating tool 1 of the above embodiments, such as Figure 7A As shown, one main surface 102c of the second housing 102 is open, and the circuit board 15 is directly fixed to the outer surface 101b of the first housing 101 via the inner surface 102d of the second housing 102. That is, the circuit board 15 in this embodiment is covered by a portion of the first housing 101 and the second housing 102.

[0108] In contrast, in the first variant of the impact rotary tool 1, such as Figure 7B As shown, the surfaces of the second housing 102 are not open, and the circuit board 15, which is completely covered by the second housing, is fixed to the outer surface 101b of the first housing 101.

[0109] In a manner similar to the implementation method, the first variation also provides the effect of preventing abrasive powder from adhering to the circuit board 15.

[0110] (4) Second variant

[0111] In the second variant of the impact rotary tool 1, the isolation part 10 is as follows: Figure 7C The wall 10a shown.

[0112] Wall 10a divides the space in the fourth housing 104 (hereinafter referred to as the fourth space S4) into a first space S1 and a second space S2. The fourth housing 104 covers the hammer 12, the anvil 13 except for the end (front end 13a) where the front end tool 2 is to be installed, and the circuit board 15.

[0113] In this way, dividing the fourth space S4 into a first space S1 and a second space S2 by the wall 10a also isolates the contact portions (12a and 13b) from the circuit board 15 and can suppress the adhesion of abrasive powder to the circuit board 15.

[0114] (5) Other variations

[0115] In another variant of the impact rotary tool 1, the second housing 102 also covers the first housing 101 in addition to the circuit board 15.

[0116] In other words, most of the hammer 12, most of the anvil 13, and the sensor 14 near the anvil 13 are covered by the first housing 101. In addition, the first housing 101, together with the circuit board 15, is covered by the second housing 102.

[0117] In this configuration, the contact portions (12a and 13b) that serve as the source of abrasive powder are also covered by the first housing 101 and thus isolated from the circuit board 15. This effectively prevents abrasive powder from adhering to the circuit board 15. Furthermore, the processing circuit 15b is double-covered by the first housing 101 and the second housing 102, which provides more effective protection for the processing circuit 15b.

[0118] (6) Summary

[0119] The first aspect of the impact rotary tool (1) includes a motor (11), a hammer (12), an anvil (13), a sensor (14), a circuit board (15), and an isolation section (10). The hammer (12) is configured to receive rotational force about an axis (200) from the motor (11) and output a striking rotational force. The striking rotational force is obtained by converting a portion of the rotational force into a striking force about the axis (200). The anvil (13), which is mounted on the front end tool (2), is configured to rotate together with the front end tool (2) about the axis (200) in response to the striking rotational force received from the hammer (12). The sensor (14) is arranged near the anvil (13) and is configured to sense changes in the state of the anvil (13) according to the striking rotational force. The circuit board (15) is configured to receive the sensing results from the sensor (14). The isolation section (10) isolates the contact portions (12a and 13b) of the hammer (12) and the anvil (13) from the circuit board (15) at least.

[0120] According to this aspect, the contact portions (12a and 13b) of the hammer (12) and anvil (13) that serve as sources of abrasive powder are at least isolated from the circuit board (15). This is able to suppress the adhesion of abrasive powder to the circuit board (15).

[0121] In the impact rotary tool (1) of the second aspect of the first aspect, the isolation part (10) includes a housing (101) covering at least the contact portions (12a and 13b), and a circuit board (15) is arranged outside the housing (101).

[0122] According to this aspect, the abrasive powder source is covered by a housing (101) to confine the abrasive powder within the housing (101). This can prevent the abrasive powder from adhering to the circuit board (15) arranged outside the housing (101).

[0123] In the impact rotation tool (1) of the third aspect of the second aspect, the circuit board (15) is fixed to the outer surface (101b) of the housing (101).

[0124] This aspect allows for a shorter distance between the sensor (14) and the circuit board (15). For example, when the sensor (14) and the circuit board (15) are connected to each other via a lead wire (14c), the length of the lead wire (14c) is shortened. Furthermore, the circuit board (15) on the outer surface (101b) of the housing (101) and the sensor (14) in the housing (101) vibrate together in response to the striking rotational force from the hammer (12). This helps to suppress tension at the lead wire (14c).

[0125] In the impact rotary tool (1) of the fourth aspect of the third aspect, the housing (101) covers the hammer (12), the anvil (13) except for the front end (13a) of the front end tool (2) to be installed, and the sensor (14).

[0126] According to this aspect, a housing (101) is used to cover most of the hammer (12) and most of the anvil (13), which are sources of abrasive powder, as well as the sensor (14) near the anvil (13). This can suppress the adhesion of abrasive powder to the circuit board (15) arranged outside the housing (101), while protecting most of the hammer (12), most of the anvil (13), and the sensor (14).

[0127] Note that when the circuit board (15) is covered with a cap or the like, the effect of suppressing abrasive powder adhesion only extends to the circuit board (15). However, when the abrasive powder source is covered with a housing (101) as in this aspect, thereby isolating it from the circuit board (15), the effect of suppressing abrasive powder adhesion generally extends to components outside the circuit board (15) as well (e.g., control circuit 17). This is able to suppress abrasive powder adhesion to components outside the circuit board (15).

[0128] In the impact rotary tool (1) of the fifth aspect with reference to the fourth aspect, the housing (101) is a first housing (101). The impact rotary tool (1) also includes a second housing (102). The second housing (102) is disposed outside the first housing (101) and covers the circuit board (15).

[0129] According to this aspect, a first housing (101) is used to cover the contact portions (12a and 13b) that serve as the source of abrasive powder, and a second housing (102) is used to cover the circuit board (15). This can further effectively suppress the adhesion of abrasive powder to the circuit board (15).

[0130] In the impact rotary tool (1) of the sixth aspect of the fifth aspect, the second housing (102) has an open main surface (102c). On the open side of the main surface (102c), with the circuit board (15) housed in the second housing (102), the second housing (102) is fixed to the outer surface (101b) of the first housing (101). The circuit board (15) is fixed to the first housing (101) through the outer surface (101b) of the first housing (101) and the inner surface (102d) of the second housing (102).

[0131] This aspect enables the second housing (102) to secure the circuit board (15) to the first housing (101) and to suppress the adhesion of abrasive powder to the circuit board (15).

[0132] The impact rotary tool (1) of the sixth aspect and the seventh aspect also includes a third housing (103). The third housing (103) is disposed outside the first housing (101) and outside the second housing (102), and at least covers the motor (11).

[0133] According to this aspect, a third housing (103) is used to cover the motor (11) and other components. This can suppress the adhesion of abrasive powder generated at the contact portions (12a and 13b) of the hammer (12) and anvil (13) to the motor (11) and other components. In addition, even when abrasive powder is generated, for example, due to friction between the brushes and commutator in the motor (11), this aspect can also suppress the adhesion of abrasive powder to the circuit board (15).

[0134] In the eighth aspect of the impact rotary tool (1) referring to any of the first to seventh aspects, a sensor (14) is configured to sense the strain of the anvil (13) and output a signal corresponding to the sensing result. A circuit board (15) includes a processing circuit (15b). The processing circuit (15b) is configured to perform a calculation process to determine the fastening torque based on the signal output from the sensor (14). The fastening torque is the torque generated about the axis (200) and applied from the anvil (13) to the fastening member via the front tool (2).

[0135] This aspect allows for the calculation of the fastening torque based on the strain of the anvil 13.

[0136] In the impact rotary tool (1) of the ninth aspect of the eighth aspect, the sensor (14) includes a magnetostrictive membrane (14a) and a coil (14b). The magnetostrictive membrane (14a) is disposed on at least a portion of the outer peripheral surface (13c) of the anvil (13). The coil (14b) surrounds the magnetostrictive membrane (14a). The circuit board (15) also includes an amplifier circuit (15a). The amplifier circuit (15a) is configured to amplify the voltage signal from the coil (14b) and provide the amplified voltage signal to the processing circuit (15b).

[0137] This aspect enables the strain of the anvil (13) to be magnetically sensed.

[0138] List of reference numerals

[0139] 1 Impact Rotary Tool

[0140] 10. Isolation Department

[0141] 11 motors

[0142] 12 hammers

[0143] 12a Contact part (hammer claw)

[0144] 13 anvil

[0145] 13a Frontend

[0146] 13b Contact portion (anvil)

[0147] 13c peripheral surface

[0148] 14 Sensors

[0149] 14a Magnetostrictive Film

[0150] 14b coil

[0151] 14c lead

[0152] 15 Circuit Boards

[0153] 15A amplifier circuit

[0154] 15b Processing Circuit

[0155] 101 First Shell (Shell)

[0156] 101b outer surface

[0157] 102 Second shell

[0158] 102c One main face

[0159] 102d inner surface

[0160] 103 Third shell

[0161] 104 Fourth Shell

[0162] 10a wall

[0163] 2. Front-end tools

Claims

1. An impact rotary tool, comprising: motor; A hammer, configured to receive rotational force about an axis from the motor and output a striking rotational force obtained by converting a portion of the rotational force into a striking force about the axis. An anvil, for mounting a front-end tool, the anvil being configured to rotate together with the front-end tool about the axis in response to a striking rotational force received from the hammer; A sensor is arranged near the anvil and configured to sense changes in the state of the anvil according to the striking rotational force. A circuit board configured to receive the sensing results from the sensor; as well as An isolation section that isolates at least the contact portions of the hammer and the anvil from the circuit board, wherein... The isolation section includes a housing covering the contact portion and the sensor. The circuit board is fixed to the outer surface of the housing, and The sensor and the circuit board are connected to each other via leads.

2. The impact rotary tool according to claim 1, characterized in that, The housing also covers the portion of the hammer and the anvil except for the front end where the front-end tool is to be mounted.

3. The impact rotary tool according to claim 2, characterized in that, The housing is a first housing, and The impact rotation tool also includes a second housing, which is disposed outside the first housing and covers the circuit board.

4. The impact rotary tool according to any one of claims 1 to 3, characterized in that, The sensor is configured to sense the strain of the anvil and output a signal corresponding to the sensing result. The circuit board includes processing circuitry configured to perform calculations to determine a fastening torque based on a signal output from the sensor, the fastening torque being generated around the axis and applied from the anvil to the fastening member via the front-end tool.

5. The impact rotary tool according to claim 4, characterized in that, The sensor includes: A magnetostrictive film, disposed on at least a portion of the outer peripheral surface of the anvil, and A coil, which surrounds the magnetostrictive membrane, and The circuit board also includes an amplifier circuit configured to amplify the voltage signal from the coil and provide the amplified voltage signal to the processing circuit.

6. An impact rotary tool, comprising: motor; A hammer, configured to receive rotational force about an axis from the motor and output a striking rotational force obtained by converting a portion of the rotational force into a striking force about the axis. An anvil, for mounting a front-end tool, the anvil being configured to rotate together with the front-end tool about the axis in response to a striking rotational force received from the hammer; A sensor is arranged near the anvil and configured to sense changes in the state of the anvil according to the striking rotational force. A circuit board configured to receive the sensing results from the sensor; as well as An isolation section that isolates at least the contact portions of the hammer and the anvil from the circuit board, wherein... The isolation section includes a housing that at least covers the contact portion. The circuit board is fixed to the outer surface of the housing. The housing covers the hammer, the anvil except for the part where the front-end tool is mounted, and the sensor. The housing is the first housing. The impact rotary tool also includes a second housing, which is disposed outside the first housing and covers the circuit board. The second housing has an open main surface. On the open side of one of the main surfaces, with the circuit board housed in the second housing, the second housing is fixed to the outer surface of the first housing, and The circuit board is fixed to the first housing via the outer surface of the first housing and the inner surface of the second housing.

7. The impact rotary tool according to claim 6, characterized in that, The impact rotary tool also includes: A third housing is disposed outside the first housing and outside the second housing, and at least covers the motor.

8. The impact rotary tool according to claim 6 or 7, characterized in that, The sensor is configured to sense the strain of the anvil and output a signal corresponding to the sensing result. The circuit board includes processing circuitry configured to perform calculations to determine a fastening torque based on a signal output from the sensor, the fastening torque being generated around the axis and applied from the anvil to the fastening member via the front-end tool.

9. The impact rotary tool according to claim 8, characterized in that, The sensor includes: A magnetostrictive film, disposed on at least a portion of the outer peripheral surface of the anvil, and A coil, which surrounds the magnetostrictive membrane, and The circuit board also includes an amplifier circuit configured to amplify the voltage signal from the coil and provide the amplified voltage signal to the processing circuit.

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