Work Machine

Abstract

The present invention achieves miniaturization. In an impact wrench 10, a speed reduction mechanism 60 includes a carrier part 62 integrally formed at a rear end of a spindle 42, and a planetary gear 66 rotatably supported on the carrier part 62, the planetary gear 66 being engaged with a pinion gear 31A of a motor 30. Moreover, the speed reduction mechanism 60 has a bearing 70 for rotatably supporting the carrier part 62, and the bearing 70 is disposed on a radially outer side of a drive shaft 31 of the motor 30, relative to the planetary gear 66. Therefore, compared to a hypothetical configuration in which the carrier part 62 were rotatably supported by the bearing 70 disposed on the front side or the rear side of the planetary gear 66, it is possible to miniaturize the physique of the speed reduction mechanism 60 in the front-rear direction, and to consequently miniaturize the physique of the impact wrench 10 in the front-rear direction. Thus, the front and back distance between a workpiece and a worker can be shortened.

Description

[Technical field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] In the impact driver (working machine) described in Patent Document 1 below, a gear mechanism is provided on the front side of the rotating shaft of the motor, and the driving force of the motor is transmitted to a tool tip provided on the anvil by the gear mechanism. The gear mechanism includes a spindle provided on the front side of the rotating shaft, a planetary gear rotatably supported by the spindle and meshed with a pinion gear of the rotating shaft, an outer gear meshed with the planetary gear, and a bearing that rotatably supports the spindle. In other words, the gear mechanism is configured as a so-called planetary gear mechanism. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-221621 A Summary of the Invention [Problem to be solved by the invention]

[0004] Here, in the gear mechanism of the impact driver, the bearings and planetary gears are arranged side by side in the axial direction (front-rear direction) of the rotating shaft. Alternatively, the bearings are arranged on the rear side of the ring gear in the axial direction (front-rear direction) of the rotating shaft. This tends to increase the size of the impact driver in the axial direction of the rotating shaft. Also, when the impact driver is used, work is performed on a workpiece in front of the impact driver. Therefore, if the size of the impact driver increases in the front-rear direction, the front-rear distance between the workpiece and the impact driver increases, which may reduce the operability of the impact driver.

[0005] SUMMARY OF THE PRESENT EMBODIMENT In consideration of the above, an object of the present invention is to provide a working machine that can be made compact. [Means for solving the problem]

[0006] One or more embodiments of the present invention include A rotor extending in the axial direction and a rotor connected to the rotor so as to be rotatable together with the rotor. the motor includes a drive shaft extending in the axial direction and a motor gear portion provided on the drive shaft; a spindle provided on one side of the motor in the axial direction; and a transmission mechanism connected to the motor gear portion and transmitting a rotational force of the drive shaft to the spindle to rotate the spindle, the transmission mechanism including an idle gear rotatably provided on the spindle and meshing with the motor gear portion, a bearing rotatably supporting the spindle and disposed radially outward of the drive shaft with respect to the idle gear, a ring-shaped ring gear meshed with the idle gear; A work machine comprising: the transmission mechanism has a support portion formed on the other side of the spindle in the axial direction and configured to support the idle gear, the support portion being a fitting portion arranged to be aligned radially with the motor gear portion and the bearing, the fitting portion being fitted to the radially inner side of the bearing. .

[0008] One or more embodiments of the present invention are a work machine in which the motor gear portion, the idle gear, and the bearing are arranged side by side in a radial direction of the drive shaft.

[0009] One or more embodiments of the present invention include ,before The working machine has the fitting portion and the idle gear arranged side by side in the circumferential direction of the drive shaft.

[0010] One or more embodiments of the present invention include The idle gear is configured as an idle gear configured as a two-stage gear having a large diameter gear portion meshed with the motor gear portion and a small diameter gear portion having a diameter smaller than that of the large diameter gear portion, and the ring gear is configured to mesh with the small diameter gear portion, and the small diameter gear portion and the ring gear are provided on the other side in the axial direction with respect to the large diameter gear portion. It is a work machine.

[0011] One or more embodiments of the present invention include The bearing is disposed on one side in the axial direction with respect to the small diameter gear portion and the ring gear. It is a work machine.

[0012] One or more embodiments of the present invention include The bearing is arranged to be aligned radially with the motor gear portion. It is a work machine.

[0013] One or more embodiments of the present invention include The motor has an impact mechanism connected to the transmission mechanism and configured to generate a rotational impact force by transmitting a rotational force of the drive shaft, the impact mechanism including a spindle provided on one side of the motor in the axial direction, a hammer that is extrapolated to one side of the spindle in the axial direction and connected to the spindle via a cam mechanism, a biasing spring that biases the hammer to one side in the axial direction, and an anvil provided on one side of the hammer in the axial direction, and the support portion includes a first support portion to which the biasing spring is engaged and rotatably supported by the bearing, a second support portion that is disposed on the other side of the first support portion in the axial direction, and a support shaft that is spanned between the first support portion and the second support portion and rotatably supports the idle gear. It is a work machine.

[0014] One or more embodiments of the present invention include Front and rearA rotor extending in a direction parallel to the rotor; Front and rear A motor having a drive shaft extending in a direction and a motor gear portion provided on the drive shaft; Front and a transmission mechanism connected to the motor gear unit for transmitting a rotational force of the drive shaft to the spindle to rotate the spindle, Integrated at rear end a support portion formed on the spindle, an idle gear rotatably provided on the support portion, the idle gear being configured as a two-stage gear having a large diameter gear portion meshed with the motor gear portion and a small diameter gear portion having a diameter smaller than that of the large diameter gear portion, a ring-shaped ring gear meshed with the small diameter gear portion, and a bearing for rotatably supporting the spindle, and the small diameter gear portion and the ring gear are rear side Established in The bearing is provided on the front side of the small diameter gear portion and the ring gear and on the radially outer side of the large diameter gear portion. This is a work machine characterized by the above.

[0015] One or more embodiments of the present invention include The motor gear portion, the large diameter gear portion, and the bearing are arranged in a radial direction of the drive shaft. It is a work machine.

[0018] One or more embodiments of the present invention include The bearing is arranged to be aligned radially with the motor gear portion. It is a work machine.

[0019] One or more embodiments of the present invention include an impact mechanism connected to the transmission mechanism and configured to transmit the rotational force of the drive shaft to generate a rotational impact force, the impact mechanism being Front a spindle provided on the Front a hammer connected to the spindle via a cam mechanism; Front side A spring for biasing the hammer Front and an anvil provided on the bearing, and the support portion includes a first support portion to which the biasing spring is engaged and which is rotatably supported by the bearing, and a second support portion which is rotatably supported by the bearing and is supported by the first support portion. rear sideand a support shaft that is bridged between the first support part and the second support part and rotatably supports the idle gear.

[0020] One or more embodiments of the present invention include Front and rear A rotor extending in a direction parallel to the rotor; Front and rear a motor having a drive shaft extending in a direction parallel to the axis of the shaft and a motor gear portion provided on the drive shaft; an impact mechanism configured to generate a rotational impact force by transmitting a rotational force of the drive shaft; and a transmission mechanism connected to the motor gear portion and the impact mechanism and configured to transmit the rotational force of the drive shaft to the impact mechanism, Front a spindle provided on the Front a hammer connected to the spindle via a cam mechanism; Front side A spring for biasing the hammer Front and an anvil provided on the spindle. Integrated at rear end the support portion includes a first support portion to which the biasing spring is engaged and which is rotatably supported by the bearing, and a second support portion to which the biasing spring is engaged and which is rotatably supported by the bearing, the first support portion including a first support portion to which the biasing spring is engaged and which is rotatably supported by the bearing, the second support portion including a second ... rear side and a support shaft that is bridged between the first support portion and the second support portion and rotatably supports the idle gear. The bearing that rotatably supports the first support portion is arranged to be aligned radially with the motor gear portion. It is a work machine that 。 Effect of the Invention

[0021] Miniaturization is possible in accordance with one or more embodiments of the present invention. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a vertical cross-sectional view showing an impact wrench according to an embodiment of the present invention. [Diagram 2] 2 is an enlarged longitudinal sectional view of the reduction mechanism shown in FIG. 1. [Diagram 3] 2A is a cross-sectional view from the front (cross-sectional view taken along line 3A-3A in FIG. 2) showing the meshing state between the small-diameter gear portion of the planetary gear of the reduction mechanism shown in FIG. 2 and the ring gear, and FIG. 2B is a cross-sectional view from the front (cross-sectional view taken along line 3B-3B in FIG. 2) showing the meshing state between the large-diameter gear portion of the planetary gear and the pinion gear of the motor. [Figure 4] 2 is a perspective view of the spindle shown in FIG. 1 as viewed obliquely from the right rear. [Diagram 5] 3 is a vertical sectional view showing a modified example of the reduction mechanism shown in FIG. 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The following describes an impact wrench 10 as a work machine according to this embodiment, with reference to the drawings. The arrows UP, FR, and RH shown as appropriate in the drawings indicate the upper side, front side, and right side of the impact wrench 10, respectively. In the following description, when the up-down, front-back, and left-right directions are used, they refer to the up-down, front-back, and left-right directions of the impact wrench 10, unless otherwise specified. For convenience, hatching is omitted in the drawings.

[0024] 1, the impact wrench 10 is configured as a tool that performs fastening processing and the like by applying a rotational force and an impact force to an anvil 50 provided at the front end of the impact wrench 10. The impact wrench 10 includes a housing 12 that forms the outer shell of the impact wrench 10, a motor 30, an impact mechanism 40, and a reduction mechanism 60 as a transmission mechanism, all of which are housed in the housing 12. Each component of the impact wrench 10 will be described below.

[0025] (Regarding the housing 12) The housing 12 is formed in a hollow, generally I-shape when viewed from the right side. Specifically, the housing 12 includes an upper housing portion 12A that constitutes the upper end of the housing 12 and extends in the front-rear direction, a handle portion 12B that extends downward from a longitudinal middle portion of the upper housing portion 12A, and a lower housing portion 12C that constitutes the lower end of the housing 12. The housing 12 is composed of a plurality of housing members, and the housing 12 is formed by assembling these housing members together.

[0026] A trigger 14 is provided at the upper end of the handle portion 12B, and the trigger 14 protrudes forward from the handle portion 12B and can be pulled rearward. A switch mechanism 16 is provided on the handle portion 12B behind the trigger 14. The switch mechanism 16 has a switch (not shown), and pulling the trigger 14 switches the switch from off to on.

[0027] A control unit 18 is provided in the lower housing portion 12C. A switch of the switch mechanism 16 is electrically connected to the control unit 18, and an output signal corresponding to the operation state of the trigger 14 is output from the switch to the control unit 18. A battery 20 is also detachably attached to the lower housing portion 12C. The battery 20 is electrically connected to the control unit 18, and supplies power to a motor 30, which will be described later, via the control unit 18.

[0028] As shown in FIG. 2, an inner case 22 is provided in the upper housing portion 12A as a case for accommodating a reduction gear mechanism 60, which will be described later. The inner case 22 is formed in a substantially bottomed cylindrical shape that is open to the front side, and is disposed in the middle of the upper housing portion 12A in the front-rear direction and assembled to the housing 12. A motor bearing 24 for supporting a drive shaft 31 of a motor 30, which will be described later, is provided in the center of the bottom wall of the inner case 22. That is, a fixing hole for fixing the motor bearing 24 is formed in the bottom wall of the inner case 22. The side wall of the inner case 22 is formed in a substantially stepped cylindrical shape, and the diameter dimension of the front part of the side wall is set larger than the diameter dimension of the rear part of the side wall. The inner space in the front part of the inner case 22 is configured as a first storage section 22A, and the inner space in the rear part of the inner case 22 is configured as a second storage section 22B.

[0029] 1, the motor 30 is accommodated in the rear end of the upper housing portion 12A and is electrically connected to the control portion 18. The motor 30 includes a drive shaft 31 whose axial direction is the front-rear direction, a rotor 32 connected to the drive shaft 31 so as to be integrally rotatable, and a substantially cylindrical stator 33 disposed radially outward of the rotor 32.

[0030] The rear end of the drive shaft 31 is rotatably supported by a motor bearing 26 fixed to the housing 12. Meanwhile, the front end portion of the drive shaft 31 is rotatably supported by a motor bearing 24 fixed to the inner case 22, and the front end of the drive shaft 31 is housed in the inner case 22. A pinion gear 31A is formed at the front end of the drive shaft 31 as a motor gear portion. A large diameter gear portion 66A of a planetary gear 66 in a reduction mechanism 60 described later is meshed with the pinion gear 31A, so that the rotational force of the motor 30 is transmitted to the spindle 42 by the reduction mechanism 60. Details of the reduction mechanism 60 will be described later.

[0031] (Impact mechanism 40) The impact mechanism 40 is configured as a known impact mechanism that applies a rotational impact force to an anvil 50 provided at the front end of the upper housing part 12A. Therefore, the configuration of the impact mechanism 40 will be briefly described below. The impact mechanism 40 has a spindle 42. The spindle 42 is formed in a substantially stepped cylindrical shape with the front-rear direction as the axial direction. The spindle 42 is rotatably accommodated in the upper housing part 12A, and is arranged coaxially with the drive shaft 31 of the motor 30 and at the front side (one axial side) of the motor 30. The diameter of the front part of the spindle 42 is set smaller than the diameter of the rear part of the spindle 42. A carrier part 62 that constitutes a part of the reduction mechanism 60 described later is integrally formed at the rear end of the spindle 42.

[0032] A substantially cylindrical hammer 44 is fitted onto the front of the spindle 42, and the hammer 44 is connected to the spindle 42 via a cam mechanism 46. An anvil 50 is provided on the front side of the spindle 42, and a tool tip (not shown) is attached to the anvil 50. The driving force of the motor 30 is transmitted to the impact mechanism 40 by a reduction mechanism 60 (described later), and the impact mechanism 40 is operated to apply a rotational impact force to the anvil 50.

[0033] (Regarding the reduction mechanism 60) As shown in Figs. 1 to 3, the reduction mechanism 60 is accommodated in the upper housing portion 12A and is disposed between the motor 30 and the impact mechanism 40. Specifically, the reduction mechanism 60 is disposed radially outside the pinion gear 31A of the motor 30. The reduction mechanism 60 is configured as a so-called planetary gear mechanism with the pinion gear 31A as a sun gear, and reduces the rotation of the motor 30 and transmits it to the impact mechanism 40. The reduction mechanism 60 includes a carrier portion 62 as a support portion integrally provided on the rear end portion of the spindle 42, three planetary gears 66 as idle gears, a ring gear 68, and a bearing 70.

[0034] 2 to 4, the carrier part 62 includes a first carrier part 62A as a first support part and a second carrier part 62B as a second support part. The first carrier part 62A and the second carrier part 62B are disposed facing each other with a predetermined gap therebetween in the front-rear direction, and are connected by a carrier connecting part 62C.

[0035] The first carrier portion 62A has a base plate portion 62A1 that constitutes a base portion of the first carrier portion 62A. The base plate portion 62A1 is formed in a substantially annular plate shape with a plate thickness direction in the front-rear direction, extends radially outward from the rear end portion of the spindle 42, and is disposed within the first housing portion 22A of the inner case 22. A step portion 62A2 that is one step lower toward the rear side is formed on the outer periphery of the front surface of the base plate portion 62A1, and a rear end portion of a biasing spring 48 that biases the hammer 44 of the impact mechanism 40 forward is engaged with the step portion 62A2.

[0036] Three fitting portions 62A3 (see FIG. 3B and FIG. 4) are formed on the outer peripheral portion of the rear surface of the base plate portion 62A1. The fitting portions 62A3 are formed in a substantially fan shape when viewed from the rear side, and protrude from the base plate portion 62A1 to the rear side. In addition, a circular arc portion connecting two sides of the fitting portion 62A3 is arranged to form a concentric circle with the outer peripheral surface of the base plate portion 62A1 when viewed from the rear side, and the three fitting portions 62A3 are arranged at equal intervals (every 120 degrees) in the circumferential direction of the spindle 42, centered on the axis of the spindle 42. As a result, a gear accommodating portion 62A4 is formed in the first carrier portion 62A between the fitting portions 62A3 adjacent to each other in the circumferential direction of the spindle 42. The gear accommodating portion 62A4 is formed in a groove shape that is open to the rear side and extends in the radial direction of the base plate portion 62A1. The three gear accommodating portions 62A4 are connected to each other at the center of the base plate portion 62A1 and are open to the radially outer side of the base plate portion 62A1. The outer periphery of the base plate portion 62A1 (more specifically, the portion disposed radially outward from the fitting portion 62A3) is configured as a restricting portion 62A5. The front portion of the pinion gear 31A of the motor 30 described above is disposed radially inward of the first carrier portion 62A.

[0037] The second carrier portion 62B is formed in a generally annular plate shape having a smaller diameter than the first carrier portion 62A and a plate thickness direction in the front-rear direction. The second carrier portion 62B is arranged coaxially with the first carrier portion 62A on the rear side of the first carrier portion 62A, and is connected to the first carrier portion 62A by a carrier connecting portion 62C extending rearward from the fitting portion 62A3 of the first carrier portion 62A. The second carrier portion 62B is arranged close to the front side of the bottom wall of the inner case 22. The rear end portion of the pinion gear 31A of the motor 30 described above is arranged radially inside the second carrier portion 62B.

[0038] 2 and 3, the gear accommodating portion 62A4 is provided with a support shaft 64 for rotatably supporting a planetary gear 66 described later. That is, in this embodiment, three support shafts 64 are provided in the carrier portion 62. The support shafts 64 are formed in a substantially cylindrical shape with the axial direction being the front-rear direction. The front end of the support shaft 64 is fixed to the first carrier portion 62A, and the rear end of the support shaft 64 is fixed to the second carrier portion 62B, so that the support shaft 64 is bridged between the first carrier portion 62A and the second carrier portion 62B. The three support shafts 64 are disposed at equal intervals (every 120 degrees) in the circumferential direction of the spindle 42.

[0039] (Regarding the planetary gear 66) The planetary gear 66 is configured as a two-stage gear with the front-rear direction as the axial direction, and is rotatably supported by the support shaft 64 of the carrier part 62. Specifically, the planetary gear 66 includes a large diameter gear part 66A that constitutes the front part of the planetary gear 66, and a small diameter gear part 66B that constitutes the rear part of the planetary gear 66. The large diameter gear part 66A and the small diameter gear part 66B are formed in a substantially cylindrical shape with the front-rear direction as the axial direction, and the diameter of the large diameter gear part 66A is set to be larger than the diameter of the small diameter gear part 66B. External teeth composed of a plurality of teeth are formed on the outer periphery of the large diameter gear part 66A and the small diameter gear part 66B, respectively, and the external teeth are formed over the entire circumference of the large diameter gear part 66A and the small diameter gear part 66B in the circumferential direction. The external teeth of the large diameter gear part 66A are meshed with the pinion gear 31A. That is, the large diameter gear portion 66A is accommodated in the gear accommodating portion 62A4 of the carrier portion 62, and is also disposed in the first accommodating portion 22A of the inner case 22. As a result, in the first carrier portion 62A, the large diameter gear portion 66A and the fitting portion 62A3 of the planetary gear 66 are arranged alternately in the circumferential direction of the first carrier portion 62A (see FIG. 3(B)). On the other hand, the small diameter gear portion 66B is arranged radially outward of the rear portion of the pinion gear 31A, and is also disposed in the second accommodating portion 22B of the inner case 22.

[0040] (Regarding the ring gear 68) The ring gear 68 is formed in the shape of an annular plate with a thickness in the front-rear direction. The ring gear 68 is arranged coaxially with the drive shaft 31 of the motor 30, and is arranged radially outward of the drive shaft 31 with respect to the small diameter gear portion 66B of the planetary gear 66. The ring gear 68 is fitted into the second housing portion 22B of the inner case 22 and is held in the inner case 22 so as not to move relative to the inner case 22. An inner tooth consisting of a plurality of teeth is formed on the inner periphery of the ring gear 68, and the inner tooth is formed over the entire circumference of the ring gear 68 in the circumferential direction. The inner tooth of the ring gear 68 is meshed with the outer tooth of the small diameter gear portion 66B of the planetary gear 66. As a result, when the drive shaft 31 of the motor 30 rotates, the planetary gear 66 revolves in the circumferential direction of the ring gear 68 while rotating about the axis of the support shaft 64. As a result, the rotational force of the motor 30, which has been reduced in speed by the reduction mechanism 60, is transmitted to the carrier portion 62, causing the spindle 42 to rotate about its own axis.

[0041] (Regarding the Bearing 70) The bearing 70 is configured as a ball bearing. The bearing 70 is fitted into the first housing portion 22A of the inner case 22 and held in the inner case 22 so as not to move relative to the inner case 22. The fitting portion 62A3 of the first carrier portion 62A in the carrier portion 62 is fitted into the bearing 70 from the front side, and the carrier portion 62 (spindle 42) is rotatably supported by the bearing 70. The large-diameter gear portion 66A of the planetary gear 66 is disposed adjacent to the bearing 70 at a predetermined gap on the radially inner side of the bearing 70 in a fitted state of the fitting portion 62A3 in the bearing 70. Furthermore, in a state where the fitting portion 62A3 is fitted into the bearing 70, the restricting portion 62A5 of the first carrier portion 62A is disposed adjacent to the radially inner portion of the bearing 70 on the front side, and the restricting portion 62A5 restricts the movement of the bearing 70 to the front side. The bearing 70 is disposed on the axially forward side of the ring gear 68. This makes it possible to reduce the axial dead space between the fan, which is the drive shaft and located on the front side of the motor 30, and the inner case 22, compared to when a conventional bearing was positioned axially rearward of the ring gear, making the working machine more compact.

[0042] (Functions and Effects) Next, the functions and effects of this embodiment will be described.

[0043] In the impact wrench 10 configured as described above, when the trigger 14 is operated by the operator, the motor 30 is driven by the control of the control unit 18, and the drive shaft 31 of the motor 30 rotates. When the drive shaft 31 rotates, the planetary gear 66 meshed with the pinion gear 31A of the drive shaft 31 rotates. The small diameter gear portion 66B of the planetary gear 66 meshes with the ring gear 68, and the ring gear 68 is held in the inner case 22 so as not to rotate. Therefore, the planetary gear 66 revolves in the circumferential direction of the ring gear 68 while rotating around the axis of the support shaft 64. This causes the carrier portion 62 (i.e., the spindle 42) to rotate. Therefore, the impact mechanism 40 is operated, and a rotational impact force is applied to the anvil 50.

[0044] Here, the reduction mechanism 60 includes a carrier portion 62 integrally formed at the rear end of the spindle 42 and a planetary gear 66 rotatably supported by the carrier portion 62, and the planetary gear 66 is meshed with the pinion gear 31A of the motor 30. The reduction mechanism 60 also has a bearing 70 that rotatably supports the carrier portion 62, and the bearing 70 is disposed radially outward of the drive shaft 31 of the motor 30 with respect to the planetary gear 66. Therefore, compared to a configuration in which the carrier portion 62 is rotatably supported by a bearing 70 disposed in front or rear of the planetary gear 66, the size of the reduction mechanism 60 in the front-rear direction can be made smaller, and the size of the impact wrench 10 in the front-rear direction can be made smaller. This allows the front-rear distance between the workpiece located in front of the impact wrench 10 and the operator located in the rear of the impact wrench 10 to be shortened. Therefore, the workability of the impact wrench 10 can be improved.

[0045] In addition, the pinion gear 31A, the planetary gear 66, and the bearing 70 of the motor 30 are arranged in line in the radial direction of the drive shaft 31 of the motor 30. That is, the pinion gear 31A, the planetary gear 66, and the bearing 70 are arranged in overlapping positions in the front-rear direction. Specifically, the working machine according to claim 9, in which the bearing is arranged within a range from the front end to the rear end of the idle gear. This can contribute to a reduction in the size of the reduction mechanism 60 in the front-rear direction, as compared to a configuration in which the bearing 70 is shifted in the front-rear direction relative to the pinion gear 31A and the planetary gear 66, and can also contribute to a reduction in the size of the impact wrench 10 in the front-rear direction.

[0046] The reduction mechanism 60 also has a ring gear 68, which is disposed radially outward of the drive shaft 31 with respect to the planetary gears 66 and is disposed rearward of the bearing 70. This allows the ring gear 68 and the bearing 70 to be disposed side by side in the front-rear direction. This allows the size of the reduction mechanism 60 in the front-rear direction to be further reduced.

[0047] The carrier portion 62 of the spindle 42 has a first carrier portion 62A constituting the front end portion of the carrier portion 62, a second carrier portion 62B constituting the rear end portion of the carrier portion 62, and a support shaft 64 that supports the planetary gear 66. The fitting portion 62A3 of the first carrier portion 62A is fitted into the bearing 70 and rotatably supported by the bearing 70. More specifically, in the first carrier portion 62A, the fitting portion 62A3 and the planetary gear 66 are alternately arranged in the circumferential direction, and the fitting portion 62A3 is fitted into the bearing 70, and the planetary gear 66 is meshed with the pinion gear 31A of the motor 30. As a result, even if the bearing 70 is arranged on the radial outside of the drive shaft 31 with respect to the planetary gear 66, the carrier portion 62 (spindle 42) can be rotatably supported by the bearing 70.

[0048] The bearing 70 is held by the inner case 22 that is open to the front. Furthermore, the restricting portion 62A5 of the first carrier portion 62A is disposed adjacent to the front side of the radially inner portion of the bearing 70, and restricts the movement of the bearing 70 to the front side. This makes it possible to utilize the carrier portion 62 to favorably maintain the holding state of the bearing 70 held by the inner case 22.

[0049] In the reduction gear mechanism 60, the ring gear 68 is disposed radially outward of the second carrier portion 62B. This allows the planetary gears 66 to be disposed in the carrier portion 62, while the ring gear 68 is disposed radially outward of the drive shaft 31 relative to the planetary gears 66.

[0050] Moreover, the planetary gear 66 of the reduction mechanism 60 includes a large diameter gear portion 66A meshed with the pinion gear 31A and a small diameter gear portion 66B meshed with the ring gear 68. This allows the rotation of the motor 30 to be reduced in speed by the reduction mechanism 60 and transmitted to the spindle 42. This contributes to the miniaturization of the motor 30. Therefore, the impact wrench 10 can be effectively miniaturized.

[0051] In this embodiment, the planetary gear 66 of the reduction mechanism 60 is configured as a two-stage gear, but the configuration of the planetary gear 66 is not limited thereto. For example, as shown in FIG. 5, the small diameter gear portion 66B may be omitted in the planetary gear 66, and the planetary gear 66 may be configured as a single-stage gear. In this case, the diameter dimension of the ring gear 68 may be made larger than that of this embodiment, and the external teeth of the rear part of the planetary gear 66 may be configured to mesh with the internal teeth of the ring gear 68. Even in this case, the bearing 70 is disposed radially outward of the drive shaft 31 with respect to the planetary gear 66, so that the size of the reduction mechanism 60 in the front-rear direction can be made smaller than a configuration in which the bearing 70 is disposed in front or rear of the planetary gear 66.

[0052] In addition, in this embodiment, pinion gear 31A is formed integrally with drive shaft 31 of motor 30, but pinion gear 31A and drive shaft 31 may be configured separately and pinion gear 31A may be connected to drive shaft 31 so as to be rotatable integrally therewith. [Explanation of symbols]

[0053] 10...impact wrench (work machine), 22...inner case (case), 30...motor, 31...drive shaft, 31A...pinion gear (motor gear portion), 42...spindle, 60...reduction mechanism (transmission mechanism), 62...carrier portion (support portion), 62A...first carrier portion (first support portion), 62A3...fitting portion, 62A5...regulating portion, 62B...second carrier portion (second support portion), 64...support shaft, 66...planetary gear (idle gear), 66A...large diameter gear portion, 66B...small diameter gear portion, 68...ring gear, 70...bearing

Claims

1. a motor including a rotor extending in an axial direction, a drive shaft connected to the rotor so as to be rotatable together with the rotor and extending in the axial direction, and a motor gear portion provided on the drive shaft; a spindle provided on one side of the motor in the axial direction; a transmission mechanism connected to the motor gear portion and configured to transmit a rotational force of the drive shaft to the spindle to rotate the spindle; Equipped with The transmission mechanism includes: an idle gear rotatably provided on the spindle and meshed with the motor gear portion; a bearing that rotatably supports the spindle and is disposed radially outward of the drive shaft with respect to the idle gear; a ring-shaped ring gear meshed with the idle gear; A working machine comprising: the transmission mechanism has a support portion formed on the other side of the spindle in the axial direction and configured to support the idle gear, The support portion has a fitting portion arranged to be aligned radially with the motor gear portion and the bearing, and the fitting portion is fitted to a radially inner side of the bearing. A work machine characterized by:

2. 2. The work machine according to claim 1, wherein the motor gear portion, the idle gear, and the bearing are arranged side by side in a radial direction of the drive shaft.

3. 2. The work machine according to claim 1, wherein the fitting portion and the idle gear are arranged side by side in the circumferential direction of the drive shaft.

4. the idle gear is configured as a two-stage idle gear having a large diameter gear portion meshed with the motor gear portion and a small diameter gear portion having a smaller diameter than the large diameter gear portion, The ring gear is configured to mesh with the small diameter gear portion, The small diameter gear portion and the ring gear are provided on the other side in the axial direction with respect to the large diameter gear portion.

2. The work machine according to claim 1 .

5. 5. The work machine according to claim 4, wherein the bearing is disposed on one side in the axial direction with respect to the small diameter gear portion and the ring gear.

6. The work machine according to claim 1 , wherein the bearing is arranged so as to be aligned radially with the motor gear portion.

7. an impact mechanism connected to the transmission mechanism and configured to transmit the rotational force of the drive shaft to generate a rotational impact force; The impact mechanism includes: a spindle provided on one side of the motor in the axial direction; a hammer that is fitted onto one side of the spindle in the axial direction and is connected to the spindle via a cam mechanism; a biasing spring that biases the hammer to one side in the axial direction; an anvil provided on one side of the hammer in the axial direction; It is composed of The support portion is a first support portion to which the biasing spring is engaged and which is rotatably supported by the bearing; A second support portion disposed on the other side in the axial direction with respect to the first support portion; a support shaft that is bridged between the first support portion and the second support portion and rotatably supports the idle gear; The work machine according to claim 1 , further comprising:

8. A motor having a rotor extending in a front-rear direction, a drive shaft connected to the rotor so as to be rotatable together with the rotor and extending in the front-rear direction, and a motor gear portion provided on the drive shaft; A spindle provided on the front side of the motor; a transmission mechanism connected to the motor gear portion and configured to transmit a rotational force of the drive shaft to the spindle to rotate the spindle; A work machine equipped with The transmission mechanism includes: A support portion integrally formed at a rear end portion of the spindle; an idle gear rotatably provided on the support portion, the idle gear being configured as a two-stage gear having a large diameter gear portion meshed with the motor gear portion and a small diameter gear portion having a diameter smaller than that of the large diameter gear portion; a ring-shaped ring gear meshed with the small diameter gear portion; A bearing that rotatably supports the spindle; It is composed of The small diameter gear portion and the ring gear are provided on the rear side of the large diameter gear portion, and the bearing is provided on the front side of the small diameter gear portion and the ring gear and on the radial outside of the large diameter gear portion. A work machine characterized by:

9. The work machine according to claim 8 , wherein the motor gear portion, the large diameter gear portion, and the bearing are arranged side by side in a radial direction of the drive shaft.

10. A work machine as described in Claim 8, wherein the bearing is arranged so as to be radially aligned with the motor gear portion.

11. An impact mechanism connected to the transmission mechanism and configured to transmit the rotational force of the drive shaft to generate a rotational impact force, The impact mechanism includes: A spindle provided on the front side of the motor; A hammer that is fitted to the front side of the spindle and is connected to the spindle via a cam mechanism; A biasing spring that biases the hammer forward; An anvil provided in front of the hammer; It is composed of The support portion is a first support portion to which the biasing spring is engaged and which is rotatably supported by the bearing; A second support portion disposed rearward of the first support portion; a support shaft that is bridged between the first support portion and the second support portion and rotatably supports the idle gear; The work machine according to claim 8, further comprising:

12. A motor having a rotor extending in a front-rear direction, a drive shaft connected to the rotor so as to be rotatable together with the rotor and extending in the front-rear direction, and a motor gear portion provided on the drive shaft; an impact mechanism configured to generate a rotational impact force by transmitting the rotational force of the drive shaft; a transmission mechanism connected to the motor gear unit and the impact mechanism and configured to transmit a rotational force of the drive shaft to the impact mechanism; A work machine equipped with The impact mechanism includes: A spindle provided on the front side of the motor; A hammer that is fitted to the front side of the spindle and is connected to the spindle via a cam mechanism; A biasing spring that biases the hammer forward; An anvil provided in front of the hammer; It is composed of The transmission mechanism includes: A support portion integrally formed at a rear end portion of the spindle; an idle gear rotatably provided on the support portion; a ring-shaped ring gear meshed with the idle gear; A bearing that rotatably supports the spindle; It is composed of The support portion is a first support portion to which the biasing spring is engaged and which is rotatably supported by the bearing; A second support portion disposed rearward of the first support portion; a support shaft that is bridged between the first support portion and the second support portion and rotatably supports the idle gear; The present invention relates to a method for manufacturing a computer-implemented ... The bearing that rotatably supports the first support portion is disposed so as to be aligned radially with the motor gear portion.

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