Driving tool

Abstract

To provide improvement related to arrangement of a motor and a flywheel in a driving tool.SOLUTION: A driving tool includes a tool body, a motor, a flywheel, and a driver. The motor is supported by the tool body. The motor has a stator, a rotor, and an output shaft. The flywheel is operably connected to the output shaft and configured to be rotationally driven around a first axis by the output shaft. At least a part of the flywheel is disposed around at least a part of the motor at the radial outer side of the motor. The output shaft is supported by a motor bearing. The flywheel is supported by a flywheel bearing, which is supported by the tool body separately from the motor bearing, so as to be rotatable around the first axis relative to the tool body.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a driving tool that drives a driving material into a workpiece by using a driver. [Background technology]

[0002] Generally, a flywheel-type driving tool includes a motor, a flywheel, and a driver. The flywheel is rotationally driven by the motor and stores rotational energy. The driver moves linearly using the rotational energy transmitted from the flywheel, striking a nail or other driving material into a workpiece. There are various arrangements of the motor and flywheel in driving tools. For example, in the driving tool disclosed in Patent Document 1, the motor and flywheel are arranged coaxially. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent No. 10,022,848 Summary of the Invention [Problem to be solved by the invention]

[0004] In the driving tool described above, the flywheel is cup-shaped and is supported by the rotor shaft of the inner rotor of the motor in a cantilevered manner, and in this arrangement, the load on the flywheel may adversely affect the rotor shaft.

[0005] In view of the above circumstances, one non-limiting object of the present disclosure is to provide an improvement in the arrangement of a motor and a flywheel in a driving tool. [Means for solving the problem]

[0006] According to one non-limiting aspect of the present disclosure, there is provided a driving tool configured to drive a driving material into a workpiece. The driving tool includes a tool body, a motor, a flywheel, and a driver. The motor is supported by the tool body. The motor has a stator, a rotor, and an output shaft rotatable about a first axis integrally with the rotor. The flywheel is operably coupled to the output shaft and configured to be rotationally driven about the first axis by the output shaft. The driver is disposed opposite the outer periphery of the flywheel. The driver is configured to drive the driving material into the workpiece by moving linearly in response to frictional engagement with the flywheel.

[0007] At least a portion of the flywheel is disposed radially outward of and around at least a portion of the motor, the output shaft is supported by a motor bearing, and the flywheel is supported by a flywheel bearing that is supported on the tool body separately from the motor bearing.

[0008] In the driving tool of this aspect, at least a portion of the flywheel is disposed radially outside the motor and around at least a portion of the motor. That is, in the extension direction of the first shaft, the area occupied by the flywheel and the area occupied by the motor at least partially overlap. This reduces the overall size of the area occupied by the motor and flywheel, thereby making it possible to miniaturize the driving tool. Furthermore, the flywheel is supported by a flywheel bearing that is supported on the tool body separately from the motor bearing. This reduces the possibility that the motor will be affected by the load acting on the flywheel. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an explanatory diagram schematically illustrating the overall configuration of a driving tool. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] In one non-limiting embodiment of the present disclosure, the driver may include a first frictional engagement portion. The outer periphery of the flywheel may include a second frictional engagement portion that is frictionally engageable with the first frictional engagement portion of the driver. The driver, flywheel, and flywheel bearing may be arranged so that a plane perpendicular to the first axis passes through the first frictional engagement portion, the second frictional engagement portion, and the flywheel bearing. According to this embodiment, the flywheel bearing can reliably bear the load (load toward the first axis) applied to the flywheel when the flywheel and the driver are frictionally engaged. Therefore, tilting of the flywheel with respect to the first axis can be effectively suppressed.

[0011] Furthermore, in this embodiment, the driver, flywheel, and motor bearing may be arranged so that the plane perpendicular to the first axis passes through the first frictional engagement portion, the second frictional engagement portion, and the motor bearing. That is, the flywheel bearing and the motor bearing may be arranged at approximately the same position in the direction in which the first shaft extends and substantially aligned in the radial direction of the output shaft. In this case, the dimension of the flywheel in the direction in which the first shaft extends can be made shorter than when the flywheel bearing and the motor bearing are arranged at positions apart in the direction in which the first shaft extends.

[0012] In addition to or instead of the above embodiment, the motor bearing and the flywheel bearing may be supported by a single member. The single member may be, for example, one of multiple members that are substantially immovably connected to one another to form the tool body. This embodiment reduces dimensional errors and assembly errors compared to when the motor bearing and the flywheel bearing are supported by separate members, thereby reducing positioning errors between the motor bearing and the flywheel bearing. This improves the positioning accuracy of the motor and the flywheel.

[0013] In addition to or instead of the above embodiment, the flywheel and the motor output shaft may be coupled (engaged) with each other so as to transmit rotation with some play. According to this embodiment, rotation can be transmitted even if the axes of the flywheel and the output shaft are slightly misaligned. This also facilitates coupling (engagement) between the flywheel and the output shaft. In this embodiment, the flywheel and the output shaft may be spline-fitted. Spline-fitting can transmit a larger torque than, for example, a connection using a key and key groove.

[0014] In addition to or instead of the above embodiment, the frictional engagement region where the flywheel and driver are frictionally engaged, the stator, and the rotor may be located on the same side of the rotation transmission region where the flywheel and output shaft are rotationally coupled (engaged) in the direction of extension of the first shaft. According to this embodiment, the overlap between the region occupied by the flywheel and the region occupied by the motor in the direction of extension of the first shaft can be increased, thereby further reducing the overall size of the region occupied by the motor and flywheel. This allows the driving tool to be more reliably downsized.

[0015] Hereinafter, a driving tool 1 according to a representative and non-limiting embodiment of the present disclosure will be specifically described with reference to the drawings.

[0016] First, with reference to FIG. 1, the schematic configuration of a driving tool 1 will be described.

[0017] The driving tool 1 is a tool capable of driving a driving material 9 into a workpiece using a linearly moving driver 4. The driving tool 1 may be embodied as, for example, a nail gun, a tacker, or a staple gun. Depending on the type of driving tool 1, for example, a nail, a tack, a pin, or a staple may be used as the driving material 9.

[0018] The outer shell of the driving tool 1 is formed mainly by a main body housing 11, a nose portion 12, a handle 14, and a magazine 17.

[0019] The main body housing 11 contains a motor 2, a flywheel 3, a driver 4, etc. The flywheel 3 is rotationally driven by the motor 2 and accumulates rotational energy. The driver 4 is disposed opposite the outer periphery of the flywheel 3. The driver 4 moves linearly along the drive shaft DX by the rotational energy transmitted from the flywheel 3 in response to frictional engagement with the flywheel 3, and drives the driving material 9 into the workpiece.

[0020] The nose portion 12 is connected to one end of the main body housing 11 in the direction in which the drive axis DX extends (hereinafter simply referred to as the drive axis direction). The nose portion 12 has an opening (injection port 120) at the end opposite to the end connected to the main body housing 11. A driver passage is defined within the main body housing 11 and the nose portion 12. The driver passage extends along the drive axis DX to the injection port 120.

[0021] A contact arm 13 is also disposed on the nose portion 12. The tip of the contact arm 13 is disposed near the injection port 120. A contact arm switch (not shown) is disposed inside the main body housing 11. The contact arm switch is normally maintained in the OFF state. The contact arm switch is configured to be turned ON when the user presses the contact arm 13 against the workpiece.

[0022] The handle 14 protrudes from the main body housing 11 in a direction intersecting the drive axis DX. A trigger 140 configured to be pressed by a user is provided at the base end of the handle 14 (the end connected to the main body housing 11). A trigger switch 141 is disposed within the handle 14. The trigger switch 141 is normally maintained in an OFF state and is configured to be switched to an ON state in response to pressing of the trigger 140. A battery mounting section 15 equipped with terminals and the like is provided at the tip end of the handle 14 (the end opposite the base end). A rechargeable battery 19 that supplies power to the motor 2 and the like is removably mounted in the battery mounting section 15.

[0023] The magazine 17 is configured to be able to store a plurality of nail materials 9, and is attached to the nose portion 12. The nail materials 9 stored in the magazine 17 are fed one by one onto the driver passage by a nail feeding mechanism (not shown).

[0024] The detailed configuration of the driving tool 1 will be described below. For convenience, in the following description, the drive axis direction (left-right direction in FIG. 1) is defined as the front-rear direction of the driving tool 1, the side where the injection port 120 is provided (right side in FIG. 1) is defined as the front side of the driving tool 1, and the opposite side (left side in FIG. 1) is defined as the rear side. Furthermore, the direction perpendicular to the drive axis DX and corresponding to the extension direction of the handle 14 (up-down direction in FIG. 1) is defined as the up-down direction of the driving tool 1, the base end side of the handle 14 (upper side in FIG. 1) is defined as the upper side, and the tip end side of the handle 14 (lower side in FIG. 1) is defined as the lower side. Furthermore, the direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction.

[0025] First, the elements arranged inside the main body housing 11 will be described.

[0026] As shown in Figures 1 and 2, the tool body 10 (not shown in Figure 1), motor 2, flywheel 3, driver 4, driver operating mechanism 51, pressing mechanism 53, and return mechanism (not shown) are arranged within the main body housing 11.

[0027] The tool body 10, also referred to as a frame or support, is fixedly held in a body housing 11. The tool body 10 supports at least a motor 2 and a flywheel 3. The tool body 10 of this embodiment includes a plurality of members that are connected and fixed to each other. More specifically, the tool body 10 is formed by connecting a first member 101 and a second member 102 so that they are substantially immovable with each other. Both the first member 101 and the second member 102 are made of metal (for example, iron, aluminum, or an alloy of iron or aluminum).

[0028] In this embodiment, the first member 101 and the second member 102 correspond to the left and right sides of the tool body 10, respectively. However, the tool body 10 may be configured by connecting and fixing multiple members divided in different directions. Furthermore, at least a part of the tool body 10 may be made of a material other than metal.

[0029] The motor 2 is supported by the tool body 10 within the lower part of the main body housing 11. The rotation axis RX of the motor 2 extends in a direction perpendicular to the drive axis DX (specifically, in the left-right direction). In this embodiment, when either the contact arm switch or the trigger switch 141 is turned on, the motor 2 is energized and driven. The flywheel 3 is disposed coaxially with the motor 2 and supported by the tool body 10. The flywheel 3 is driven to rotate around the rotation axis RX by the motor 2 and accumulates rotational energy. The detailed configurations and arrangements of the motor 2 and the flywheel 3 will be described later.

[0030] The driver 4 is an elongated member extending in the drive shaft direction (front-rear direction). The driver 4 includes a main body 41, a roller contact portion 43 protruding upward from the main body 41, and a first friction engagement portion 45 protruding downward from the main body 41. The front end of the main body 41 constitutes a striking portion that strikes the driving material 9. The roller contact portion 43 is a portion that receives pressure from a pressure roller 531, which will be described later. The front end of the roller contact portion 43 is configured as a cam portion whose height (vertical thickness) gradually increases toward the rear. The first friction engagement portion 45 is configured to be capable of frictionally engaging with the flywheel 3 (more specifically, the second friction engagement portion 33). In this embodiment, the first friction engagement portion 45 includes multiple engagement protrusions 451. Each engagement protrusion 451 is a ridge extending in the front-rear direction.

[0031] The driver 4 is disposed above the flywheel 3 and faces the outer periphery of the flywheel 3. The driver 4 is movable in the front-rear direction between an initial position (the position shown in FIG. 1) and a driving position (not shown) in which the front end of the driver 4 slightly protrudes from the injection port 120. The driver 4 is normally held in the initial position (rearmost position). When the driver 4 is in the initial position, there is no frictional engagement between the driver 4 and the flywheel 3.

[0032] The driver actuation mechanism 51 is supported on the tool body 10 above the driver 4. The driver actuation mechanism 51 is configured to move the driver 4 forward to a position where rotational energy can be transmitted from the flywheel 3. The driver actuation mechanism 51 of this embodiment includes a solenoid 511 and a lever 513. The lever 513 is rotated in response to activation of the solenoid 511 and presses the driver 4 forward, thereby moving the driver 4 forward. In this embodiment, the solenoid 511 is activated in response to both the contact arm switch and the trigger switch 141 being turned on. In other words, the solenoid 511 is activated when the motor 2 is driven.

[0033] The pressing mechanism 53 is disposed above the driver 4 within the main housing 11 and faces the driver 4 on the opposite side from the flywheel 3. The pressing mechanism 53 includes a pressing roller 531 and a biasing spring 533. The pressing roller 531 is supported so as to be movable in the vertical direction and rotatable about an axis parallel to the rotation axis RX of the flywheel 3. The biasing spring 533 biases the pressing roller 531 downward. As the driver 4 is moved forward from its initial position by the driver operating mechanism 51, the pressing roller 531 abuts against the roller abutment portion 43. The pressing roller 531 presses the driver 4 toward the flywheel 3, causing the driver 4 to frictionally engage with the flywheel 3. As a result, the driver 4 receives rotational energy transmitted from the flywheel 3 and moves linearly forward to the driving position, driving the driving material 9 into the workpiece.

[0034] It should be noted that, instead of the driver operating mechanism 51 and the pressing mechanism 53 described above, a known pressing mechanism may be employed in which a pressing roller presses the driver 4 in the initial position downward to cause frictional engagement with the flywheel 3. In accordance with this change, the configuration of the driver 4 may also be changed as appropriate.

[0035] The return mechanism is configured to return the driver 4 to its initial position after driving out the driving material 9. As the return mechanism, for example, a known mechanism can be used that uses the elastic force of an elastic member (for example, a compression coil spring or a torsion coil spring) to pull the driver 4, which has been moved forward to the driving position, back to its initial position.

[0036] The detailed configuration and arrangement of the motor 2 and the flywheel 3 will be described below.

[0037] As shown in FIG. 2, the motor 2 includes a stator 21, a rotor 23, and an output shaft 25 that can rotate integrally with the rotor 23. The motor 2 of this embodiment is an inner rotor type brushless DC motor, and the rotor 23 is disposed radially inside the stator 21. Both axial ends of the output shaft 25 protrude from both axial ends of the rotor 23. A rotation axis RX of the output shaft 25 extends in the left-right direction. The stator 21 and the rotor 23 of the motor 2 are disposed on one side (the right side) of an imaginary plane that is perpendicular to the rotation axis RX and passes through the substantial center of the driving tool 1 in the left-right direction (an imaginary plane that is perpendicular to the rotation axis RX and includes the drive axis DX).

[0038] The stator 21 is supported by the tool body 10 while being housed in the motor case 20. The motor case 20 is a cylindrical member with a bottom, and has a cylindrical wall portion 201 and a bottom wall portion 203. The motor case 20 is fixed to the tool body 10 so as to be substantially immovable. More specifically, the motor case 20 is disposed so that it opens to the left and the bottom wall portion 203 is located on the right side, and is fixed to the second member 102 of the tool body 10 with screws (not shown).

[0039] The output shaft 25 is supported by a first motor bearing 261 and a second motor bearing 262 to be rotatable around the rotation axis RX relative to the tool body 10. In this embodiment, the first motor bearing 261 is supported by the tool body 10. More specifically, the first motor bearing 261 is fitted into and supported by a cylindrical portion (hereinafter referred to as the cylindrical portion 103) of the second member 102. On the other hand, the second motor bearing 262 is supported by the motor case 20 fixed to the second member 102. More specifically, the second motor bearing 262 is fitted into and supported by a recess provided in the center of the bottom wall portion 203 of the motor case 20.

[0040] Furthermore, a first rotation transmission part 27 is provided on a part of the output shaft 25 that protrudes leftward from the rotor 23. More specifically, the first rotation transmission part 27 is provided on a part that protrudes leftward beyond the first motor bearing 261. The first rotation transmission part 27 is configured to engage with the second rotation transmission part 35 of the flywheel 3 and transmit the rotation of the output shaft 25 to the flywheel 3. In this embodiment, the first rotation transmission part 27 is configured as an external spline part having splines (teeth, ridges) 271 formed on its outer periphery.

[0041] The flywheel 3 is formed in a cup shape overall. More specifically, the flywheel 3 includes a cylindrical large-diameter portion 311 and a cylindrical small-diameter portion 313 having an inner diameter and an outer diameter smaller than those of the large-diameter portion 311. The flywheel 3 is oriented such that the large-diameter portion 311 is on the right side and the small-diameter portion 313 is on the left side, and is supported by a first flywheel bearing 371 to be rotatable around the rotation axis RX with respect to the tool body 10. The first flywheel bearing 371 is fitted around and supported by the cylindrical portion 103 of the second member 102.

[0042] The large diameter portion 311 is fitted onto the outer periphery of the first flywheel bearing 371 and is rotatably supported. In other words, the large diameter portion 311 is disposed around a part of the output shaft 25, the first motor bearing 261, the cylindrical portion 103, and the first flywheel bearing 371 on the radially outer side thereof.

[0043] Additionally, a second frictional engagement portion 33 is provided on the outer periphery of the large diameter portion 311. The second frictional engagement portion 33 is configured to be able to frictionally engage with the first frictional engagement portion 45 of the driver 4. In this embodiment, the second frictional engagement portion 33 includes a plurality of engagement grooves 331 corresponding to the plurality of engagement protrusions 451 of the first frictional engagement portion 45. Each engagement groove 331 is an annular groove that surrounds the entire circumference of the flywheel 3. When the driver 4 is pressed against the flywheel 3, the engagement groove 331 is configured to at least partially come into contact with the engagement protrusion 451 and engage with the engagement protrusion 451 by frictional force.

[0044] The small diameter portion 313 is disposed around the first rotation transmission portion 27 of the output shaft 25 of the motor 2. The small diameter portion 313 is provided with a second rotation transmission portion 35. The second rotation transmission portion 35 is connected (engaged) with the first rotation transmission portion 27 of the output shaft 25 and configured to rotate together with the output shaft 25. In this embodiment, the second rotation transmission portion 35 is configured as an internal spline portion having splines (teeth, ridges) 351 formed on its inner periphery.

[0045] The first rotation-transmitting portion 27 (spline 271) and the second rotation-transmitting portion 35 (spline 351) are connected (engaged) with some play. In other words, the output shaft 25 and the flywheel 3 are spline-fitted with some play. With this configuration, rotation can be transmitted even if the axes of the flywheel 3 and the output shaft 25 are slightly misaligned. Furthermore, since the first rotation-transmitting portion 27 and the second rotation-transmitting portion 35 do not require high-precision dimensional control, they are easy to manufacture, and the connection (engagement) between the flywheel 3 and the output shaft 25 is easy. Furthermore, spline fitting has the advantage of being able to transmit a larger torque than, for example, a connection using a key and key groove.

[0046] In addition, in the direction in which the rotation axis RX extends (i.e., the left-right direction), a region (rotation transmission region R4) in which the first rotation transmission part 27 and the second rotation transmission part 35 engage to transmit rotation is located at a position corresponding to the tip of the output shaft 25. The region (friction engagement region R3) in which the second friction engagement part 33 and the first friction engagement part 45 engage, the stator 21, and the rotor 23 are located on the same side (right side) of the rotation transmission region R4 in the direction in which the rotation axis RX extends (hereinafter referred to as the rotation axis direction).

[0047] A second flywheel bearing 372 is fitted around the tip of the small-diameter portion 313 (more specifically, the portion that protrudes leftward beyond the left end of the first rotation-transmitting portion 27). The second flywheel bearing 372 is fitted into and supported in a recess provided in the first member 101 of the tool body 10. In this embodiment, the first flywheel bearing 371 is designed to be able to bear the load of the flywheel 3 by itself. On the other hand, the second flywheel bearing 372 is added, for example, to prevent the flywheel 3 from coming off the first member 101 during assembly and to provide auxiliary support for the flywheel 3. Therefore, the second flywheel bearing 372 may be omitted.

[0048] As described above, in this embodiment, a portion of the flywheel 3 surrounds a portion of the motor 2 radially outward. In other words, a portion of the flywheel 3 is disposed so as to overlap a portion of the motor 2 in the direction of the rotation axis. More specifically, in the direction of the rotation axis (left-right direction), a flywheel region R1 between both ends (left and right ends) of the flywheel 3 partially overlaps a motor region R2 between both ends (left and right ends) of the motor 2. More specifically, the motor 2 and the flywheel 3 are disposed so that a portion of the flywheel region R1 overlaps a portion of the motor region R2 between the left ends of the stator 21 and rotor 23 and the tip (left end) of the output shaft 25. In other words, a portion of the flywheel 3 surrounds the periphery of a portion of the output shaft 25 that protrudes leftward from the stator 21 and rotor 23. This arrangement allows for a compact driving tool 1 to be realized.

[0049] Specifically, the dimensions of the driving tool 1 in the front-rear direction can be reduced compared to a configuration in which the motor 2 and the flywheel 3 are arranged side by side in the front-rear direction. Furthermore, the mechanism for transmitting rotation from the output shaft 25 to the flywheel 3 can be simplified. Furthermore, the dimensions of the driving tool 1 in the left-right direction can be reduced compared to a configuration in which the motor 2 and the flywheel 3 are arranged side by side (without overlapping) in the left-right direction. In particular, in this embodiment, most of the flywheel 3 is arranged around the motor 2. Specifically, the area of ​​the flywheel region R1 that overlaps with the motor region R2 is more than three-quarters of the flywheel region R1. Therefore, the dimensions of the driving tool 1 in the left-right direction can be reliably reduced. Furthermore, the entire flywheel 3 is arranged around the motor 2 except for the stator 21, which has the largest diameter. Therefore, the radial dimensions can be reduced compared to a configuration in which at least a portion of the flywheel 3 is arranged around the stator 21.

[0050] Furthermore, the flywheel 3 is supported not by the output shaft 25 but by the first flywheel bearing 371 supported by the tool body 10. Therefore, the output shaft 25 does not directly bear the load applied to the flywheel 3. This improves the durability of the motor 2.

[0051] Furthermore, in the driving tool 1, in order to perform the driving operation, the driver 4 needs to be pressed against the flywheel 3 and frictionally engage with the flywheel 3. In this type of system, a strong load is applied to the flywheel 3 in a direction (downward) from the second frictional engagement portion 33, which is frictionally engaged with the first frictional engagement portion 45, toward the rotation axis RX.

[0052] In contrast, in this embodiment, the driver 4, the flywheel 3, and the first flywheel bearing 371 are arranged so that an imaginary plane (for example, plane L in FIG. 2) perpendicular to the rotation axis RX passes through the first frictional engagement portion 45, the second frictional engagement portion 33, and the first flywheel bearing 371. Therefore, the load applied from the driver 4 to the flywheel 3 can be reliably received by the first flywheel bearing 371 supported by the tool body 10. This prevents the flywheel 3 from tilting with respect to the rotation axis RX. This reduces the possibility of poor power transmission from the output shaft 25 to the flywheel 3.

[0053] Furthermore, the first motor bearing 261 is disposed so that the above-mentioned plane L, which passes through the first frictional engagement portion 45, the second frictional engagement portion 33, and the first flywheel bearing 371, also passes through the first motor bearing 261. In other words, the first flywheel bearing 371 and the first motor bearing 261 are disposed at approximately the same position in the rotational axis direction (a position that at least partially overlaps with the frictional engagement region R3), and are substantially aligned in the radial direction of the output shaft 25. Therefore, the dimension of the flywheel 3 in the rotational axis direction can be shortened compared to when the first flywheel bearing 371 and the first motor bearing 261 are disposed at positions separated in the rotational axis direction.

[0054] Furthermore, the first motor bearing 261 and the first flywheel bearing 371 are supported by the second member 102, which is the same single member among the multiple members (first member 101 and second member 102) that make up the tool body 10. This reduces dimensional errors and assembly errors compared to when the first motor bearing 261 and the first flywheel bearing 371 are each supported by separate members. This reduces positioning errors between the first motor bearing 261 and the first flywheel bearing 371, improving the positioning accuracy of the motor 2 and the flywheel 3.

[0055] The correspondence between each component (feature) of the above embodiment and each component (feature) of the present disclosure or invention is shown below. However, each component of the embodiment is merely an example and does not limit each component of the present disclosure or invention.

[0056] The rotation axis RX of the output shaft 25 is an example of a "first axis." The first motor bearing 261 is an example of a "motor bearing." The first flywheel bearing 371 is an example of a "flywheel bearing." The plane L is an example of a "plane perpendicular to the first axis." The second member 102 is an example of a "single member."

[0057] It should be noted that the above-described embodiment is merely an example, and the driving tool according to the present disclosure is not limited to the illustrated driving tool 1. For example, the following modifications can be made. Furthermore, at least one of these modifications can be adopted in combination with the driving tool 1 illustrated in the embodiment and at least one of the features described in each claim.

[0058] For example, the motor 2 may be directly supported by the tool body 10 without being housed in the motor case 20. The motor 2 may be a brush motor or an AC motor. The first motor bearing 261 does not need to be located at approximately the same position as the first flywheel bearing 371 in the rotational axis direction, but as described above, from the viewpoint of the positioning accuracy of the motor 2 and the flywheel 3, it is preferable that the first motor bearing 261 and the first flywheel bearing 371 be supported by the same single member.

[0059] The shape of the flywheel 3 and the arrangement of the flywheel 3 relative to the motor 2 may be modified as appropriate, as long as the flywheel 3 is arranged coaxially with the motor 2 and at least a portion of the flywheel 3 is arranged radially outside the motor 2 and surrounding at least a portion of the motor 2. For example, at least a portion of the flywheel 3 may be arranged around the entire motor 2. That is, a portion of the flywheel 3 may surround the stator 21. The position of the first flywheel bearing 371 may also be modified in accordance with such modifications. For example, in the case where a portion of the flywheel 3 surrounds the stator 21, a cylindrical portion surrounding the stator 21 may be provided in the tool body 10, and the first flywheel bearing 371 may be fitted around this cylindrical portion.

[0060] Furthermore, the configurations of the first friction engagement portion 45 of the driver 4 and the second friction engagement portion 33 of the flywheel 3 may be changed as appropriate, as long as the first friction engagement portion 45 and the second friction engagement portion 33 are capable of frictionally engaging with each other and transmitting the rotational energy of the flywheel 3 to the driver 4. For example, the number and arrangement of the engagement protrusions 451 and the engagement grooves 331 may be selected as appropriate. Also, for example, the driver 4 may have the engagement grooves, and the flywheel 3 may have the engagement protrusions.

[0061] In view of the spirit of the present invention and the above-described embodiments, the following aspects are constructed, and at least one of the following aspects may be adopted in combination with the features of the embodiments and their variants, or at least one of the features described in each claim. [Aspect 1] The output shaft is rotatably supported by two bearings, and the motor bearing is one of the two bearings. [Aspect 2] the tool body has a cylindrical portion surrounding a part of the motor, The flywheel bearing is fitted around and supported by the cylindrical portion, A portion of the flywheel is fitted around the flywheel bearing and is rotatably supported. [Aspect 3] The driving tool further includes a pressure roller configured to press the driver toward the flywheel. [Aspect 4] The pressure roller, the driver, the flywheel, and the flywheel bearing are arranged so that a straight line perpendicular to the first axis passes through the pressure roller, the first friction engagement portion, the second friction engagement portion, and the flywheel bearing. [Aspect 5] The flywheel is disposed entirely around the rest of the motor except for the stator. [Explanation of symbols]

[0062] 1: driving tool, 10: tool body, 101: first member, 102: second member, 103: cylindrical portion, 11: main body housing, 12: nose portion, 120: injection port, 13: contact arm, 14: handle, 140: trigger, 141: trigger switch, 15: battery mounting portion, 17: magazine, 19: battery, 2: motor, 20: motor case, 201: cylindrical wall portion, 203: bottom wall portion, 21: stator, 23: rotor, 25: output shaft, 261: first motor bearing, 262: second motor bearing, 27: first rotation transmission portion, 271: spline, 3: flywheel, 3 11: large diameter portion, 313: small diameter portion, 33: second friction engagement portion, 331: engagement groove, 35: second rotation transmission portion, 351: spline, 371: first flywheel bearing, 372: second flywheel bearing, 4: driver, 41: main body portion, 43: roller abutment portion, 45: first friction engagement portion, 451: engagement protrusion, 51: driver operating mechanism, 511: solenoid, 513: lever, 53: pressing mechanism, 531: pressing roller, 533: biasing spring, 9: driving material, R1: flywheel region, R2: motor region, R3: friction engagement region, R4: rotation transmission region, DX: drive shaft, RX: rotating shaft

Claims

1. A driving tool configured to drive a driving material into a workpiece, A tool body, a motor supported by the tool body, the motor having a stator, a rotor, and an output shaft rotatable integrally with the rotor about a first axis; a flywheel operatively coupled to the output shaft and configured to be rotationally driven by the output shaft about the first axis; a driver disposed opposite to the outer periphery of the flywheel and configured to move linearly in response to frictional engagement with the flywheel to drive the driving material into the workpiece; At least a portion of the flywheel is disposed radially outward of the motor and around at least a portion of the motor; The output shaft is supported by a motor bearing; The driving tool, wherein the flywheel is supported rotatably about the first axis relative to the tool body by a flywheel bearing supported on the tool body separately from the motor bearing.

2. The driving tool according to claim 1, The driver includes a first friction engagement portion, the outer periphery of the flywheel is provided with a second friction engagement portion capable of frictionally engaging with the first friction engagement portion of the driver; The driving tool, characterized in that the driver, the flywheel, and the flywheel bearing are arranged so that a plane perpendicular to the first axis passes through the first friction engagement portion, the second friction engagement portion, and the flywheel bearing.

3. The driving tool according to claim 2, The driving tool, characterized in that the driver, the flywheel, and the motor bearing are arranged so that the plane passes through the first friction engagement portion, the second friction engagement portion, and the motor bearing.

4. A driving tool according to any one of claims 1 to 3, The driving tool, wherein the motor bearing and the flywheel bearing are supported by a single member.

5. A driving tool as claimed in claim 1, The driving tool, wherein the flywheel and the output shaft of the motor are connected to each other in a rotationally transmitting manner with play.

6. The driving tool according to claim 5, The driving tool, wherein the flywheel and the output shaft are spline-fitted.

7. The driving tool according to claim 5 or 6, A driving tool characterized in that a friction engagement area where the flywheel and the driver frictionally engage, the stator, and the rotor are located on the same side in the extension direction of the first axis with respect to a rotation transmission area where the flywheel and the output shaft are connected to transmit rotation.

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