JP2024035084A - Electric tool - Google Patents

Abstract

To inhibit deterioration of workability of an electric tool.SOLUTION: An electric tool includes: a motor including a rotor rotatable about a rotation axis extending in a front-back direction and a stator; an output unit located at the front side relative to the motor and configured to rotate based on a rotational force of the rotor; a motor compartment accommodating the motor; a grip part extending downward from the motor compartment; a rear rotor bearing supporting a rear portion of the rotor; and a rear cover arranged to cover an opening at a rear end of the motor compartment and holding the rear rotor bearing. The motor compartment includes: a guide part that guides the rear cover to one side in a circumferential direction and the front side; a front-back restriction part that restricts movement of the rear cover guided by the guide part in the front-back direction; and a circumferential restriction part that restricts circumferential movement of the rear cover restricted from moving in the front-rear direction.SELECTED DRAWING: Figure 8

Description

The technology disclosed herein relates to a power tool.

In the technical field related to power tools, a power tool as disclosed in Patent Document 1 is known. The power tool disclosed in Patent Document 1 includes a main body case in which a DC brushless motor is housed, and a rear case that closes the rear part of the main body case. The rear case is fixed to the rear of the main case with two screws.

Japanese Patent Application Publication No. 2007-295773

A boss portion is provided on each of the rear case and the main case in order to fix the rear case to the rear of the main case with two screws. If the boss portion protrudes from each of the rear case and the main case in the left-right direction, it may become difficult to use the power tool, for example, in a narrow space near a wall. Furthermore, in the case of the method of fixing the rear case to the rear part of the main body case using two screws, the ease of assembling the power tool may be reduced.

The technology disclosed in this specification aims to suppress deterioration in workability of a power tool. Another purpose is to suppress deterioration in the assemblability of power tools.

This specification discloses a power tool. The power tool includes a motor having a rotor and a stator that rotate around a rotating shaft extending in the front-rear direction, an output section that is placed in front of the motor and rotates based on the rotational force of the rotor, and a motor that houses the motor. A housing part, a grip part extending downward from the motor housing part, a rear rotor bearing that supports the rear part of the rotor, and a rear rotor bearing that is arranged to cover the opening at the rear end of the motor housing part and holds the rear rotor bearing. It may also include a rear cover. The motor accommodating part includes a guide part that guides the rear cover to one side in the circumferential direction and to the front side, a front-rear restriction part that restricts movement of the rear cover guided by the guide part in the front-rear direction, and a front-rear movement is restricted. The rear cover may also include a circumferential direction regulating portion that regulates movement of the rear cover in the circumferential direction.

According to the technology disclosed in this specification, a decrease in workability of a power tool is suppressed. Furthermore, deterioration in the ease of assembling the power tool is suppressed.

FIG. 1 is a perspective view from the front side showing a power tool according to a first embodiment. FIG. 2 is a side view showing the power tool according to the first embodiment. FIG. 3 is a perspective view from the rear side showing the upper part of the power tool according to the first embodiment. FIG. 4 is a diagram of the upper part of the power tool according to the first embodiment viewed from the rear side. FIG. 5 is a side view showing the upper part of the power tool according to the first embodiment. FIG. 6 is a longitudinal sectional view showing the upper part of the power tool according to the first embodiment. FIG. 7 is a cross-sectional view showing the upper part of the power tool according to the first embodiment. FIG. 8 is an exploded perspective view from the rear side showing the upper part of the power tool according to the first embodiment. FIG. 9 is a perspective view from the front side showing the rear cover according to the first embodiment. FIG. 10 is a diagram of the rear cover according to the first embodiment viewed from the right side. FIG. 11 is a diagram of the rear cover according to the first embodiment viewed from the left side. FIG. 12 is a diagram of the rear cover according to the first embodiment viewed from above. FIG. 13 is a diagram of the rear cover according to the first embodiment viewed from below. FIG. 14 is a diagram of the rear cover according to the first embodiment viewed from the rear side. FIG. 15 is a diagram of the rear cover according to the first embodiment viewed from the front side. FIG. 16 is a view of the rear part of the upper part of the power tool according to the first embodiment with the rear cover removed, viewed from the rear side. FIG. 17 is a perspective view from the right rear side showing the rear part of the upper part of the power tool according to the first embodiment with the rear cover removed. FIG. 18 is a perspective view from the left rear side showing the rear part of the upper part of the power tool with the rear cover removed according to the first embodiment. FIG. 19 is a view of the upper rear part of the power tool according to the first embodiment with the rear cover removed, viewed from the right side. FIG. 20 is a view of the upper rear part of the power tool according to the first embodiment with the rear cover removed, viewed from the left side. FIG. 21 is a sectional view for explaining the method of fixing the rear cover according to the first embodiment. FIG. 22 is a sectional view for explaining the method of fixing the rear cover according to the first embodiment. FIG. 23 is a sectional view for explaining the method of fixing the rear cover according to the first embodiment. FIG. 24 is a sectional view for explaining the method of fixing the rear cover according to the first embodiment. FIG. 25 is a cross-sectional view for explaining the method for releasing the fixation of the rear cover according to the first embodiment. FIG. 26 is a perspective view from the rear side showing the upper part of the power tool according to the second embodiment. FIG. 27 is a perspective view from the rear side showing the upper part of the power tool according to the third embodiment. FIG. 28 is a diagram schematically showing a power tool according to the fourth embodiment. FIG. 29 is a perspective view from the rear side showing the power tool according to the fifth embodiment. FIG. 30 is a diagram of the rear cover according to the fifth embodiment viewed from the rear side. FIG. 31 is a side view showing a power tool according to the sixth embodiment. FIG. 32 is a perspective view from the rear side showing the power tool according to the seventh embodiment. FIG. 33 is a side view showing the upper part of the power tool according to the seventh embodiment. FIG. 34 is a perspective view from the rear side showing the power tool according to the seventh embodiment. FIG. 35 is a perspective view from the rear side showing the power tool according to the eighth embodiment. FIG. 36 is a perspective view from the rear side showing the power tool according to the eighth embodiment. FIG. 37 is a perspective view from the rear side showing the power tool according to the ninth embodiment. FIG. 38 is a perspective view from the rear side showing the power tool according to the ninth embodiment. FIG. 39 is a perspective view from the rear side showing the power tool according to the tenth embodiment. FIG. 40 is a side view showing the upper part of the power tool according to the tenth embodiment. FIG. 41 is a perspective view from the rear side showing the power tool according to the eleventh embodiment. FIG. 42 is a side view showing the upper part of the power tool according to the eleventh embodiment. FIG. 43 is a perspective view from the rear side showing the power tool according to the twelfth embodiment. FIG. 44 is a perspective view from the rear side showing the power tool according to the thirteenth embodiment. FIG. 45 is a perspective view from the front side showing the power tool according to the fourteenth embodiment. FIG. 46 is a perspective view from the rear side showing the power tool according to the fourteenth embodiment. FIG. 47 is a side view showing the upper part of the power tool according to the fourteenth embodiment. FIG. 48 is a diagram of the upper part of the power tool according to the fourteenth embodiment viewed from the front side. FIG. 49 is a cross-sectional view showing the upper part of the power tool according to the fourteenth embodiment. FIG. 50 is a perspective view from the rear side showing the power tool according to the fifteenth embodiment. FIG. 51 is a diagram of the upper part of the power tool according to the fifteenth embodiment viewed from the rear side. FIG. 52 is a cross-sectional view showing the upper part of the power tool according to the sixteenth embodiment. FIG. 53 is a cross-sectional view showing the upper part of the power tool according to the seventeenth embodiment. FIG. 54 is a perspective view from the rear side showing the power tool according to the eighteenth embodiment. FIG. 55 is a diagram of the upper part of the power tool according to the eighteenth embodiment viewed from the rear side. FIG. 56 is a perspective view from the rear side showing the power tool according to the nineteenth embodiment. FIG. 57 is a diagram schematically showing a power tool according to the twentieth embodiment.

In one or more embodiments, the power tool includes a motor having a rotor and a stator that rotate around a rotation axis extending in the front-rear direction, and a motor that is disposed in front of the motor and that rotates based on the rotational force of the rotor. a motor accommodating part for accommodating the motor; a grip part extending downward from the motor accommodating part; a rear rotor bearing for supporting the rear part of the rotor; and a rear cover arranged to hold the rear rotor bearing. The motor accommodating part includes a guide part that guides the rear cover to one side in the circumferential direction and to the front side, a front-rear restriction part that restricts movement of the rear cover guided by the guide part in the front-rear direction, and a front-rear movement is restricted. The rear cover may also include a circumferential direction regulating portion that regulates movement of the rear cover in the circumferential direction.

In the above configuration, by simply rotating the rear cover relative to the rear portion of the motor accommodating portion without using screws, the movement of the rear cover in the front-rear direction and the circumferential direction relative to the motor accommodating portion is restricted. That is, the rear cover is fixed to the rear part of the motor housing part by simply rotating the rear cover relative to the rear part of the motor housing part without using screws. Since screws are not required, there is no need to provide a boss portion on the rear cover and the motor housing portion. Therefore, increasing the size of the power tool is suppressed. In particular, enlargement of the rear cover and the motor accommodating portion in the left-right direction is suppressed. Since the power tool is prevented from increasing in size, the workability of the power tool is prevented from deteriorating even in a narrow space near a wall, for example. Further, since screws are not required, deterioration in the ease of assembling the power tool is suppressed.

In one or more embodiments, the motor accommodating portion includes a support surface that is arranged to surround the rotation axis and faces rearward, a housing tube that projects rearward from the support surface and defines an opening, and a housing. The housing may include a housing claw portion that projects radially outward from the outer circumferential surface of the cylindrical portion. The guide portion may be provided on the housing claw portion.

In the above configuration, the rear cover is guided by the housing claw portion.

In one or more embodiments, the housing claw portion may have an inclined surface that slopes forward toward one side in the circumferential direction. The guide portion may include an inclined surface.

In the above configuration, the rear cover is guided to one side in the circumferential direction and to the front side by the inclined surface of the housing claw portion.

In one or more embodiments, at least a portion of the longitudinal restriction portion may be provided in the housing claw portion.

In the above configuration, the housing claw portion restricts movement of the rear cover in the front-rear direction.

In one or more embodiments, the housing pawl may have a forwardly facing front surface. The longitudinal direction regulating portion may include a front surface. The front surface may restrict movement of the rear cover to the rear side.

In the above configuration, rearward movement of the rear cover is restricted by the front surface of the housing claw portion.

In one or more embodiments, the support surface may be disposed about the housing barrel. The front surface may face the support surface with a gap interposed therebetween. The longitudinal direction regulating portion may include a support surface. The support surface may restrict forward movement of the rear cover.

In the above configuration, the support surface restricts forward movement of the rear cover.

In one or more embodiments, the rear cover may have a cover pawl that contacts the housing pawl. The cover claw portion may be placed between the front surface and the support surface after being guided by the inclined surface.

In the above configuration, by rotating the rear cover only once at a predetermined angle, the rear cover is guided to one side in the circumferential direction and to the front side, and then movement of the rear cover in the front-back direction is restricted.

In one or more embodiments, the rear cover may include a cover tube disposed around the housing tube. The cover claw portion may be provided on the inner circumferential surface of the cover cylinder portion.

In the above configuration, the housing claw portion and the cover claw portion can be engaged with each other by rotating the rear cover around the housing cylindrical portion.

In one or more embodiments, each of the housing claw part and the cover claw part may be provided in plural numbers at intervals in the circumferential direction.

With the above configuration, the guide of the rear cover is stabilized, and the movement of the rear cover in the front-rear direction is stably restricted.

In one or more embodiments, the rear cover may include a cover claw portion that is guided by the guide portion.

In the above configuration, the rear cover is guided by the guide part via the cover claw part.

In one or more embodiments, the longitudinal direction regulating section may regulate movement of the cover claw section in the longitudinal direction.

In the above configuration, the rear cover is restricted from moving in the front-rear direction via the cover claw portion.

In one or more embodiments, the circumferential restriction portion may be located at a different location than the front-back restriction portion.

With the above configuration, complication of the structure of each of the longitudinal direction regulating part and the circumferential direction regulating part is suppressed.

In one or more embodiments, the circumferential restriction portion may include a hook member having a hook portion that is hooked onto an engaging portion provided on the rear cover.

In the above configuration, movement of the rear cover in the circumferential direction is restricted by hooking the hook portion to the engaging portion.

In one or more embodiments, the hook member may include an arm having a proximal end that is secured to the motor housing and a distal end that is provided with a hook.

In the above configuration, the hook portion can be smoothly hooked onto the engaging portion.

In one or more embodiments, the arm portion may be elastically deformable such that the hook portion moves radially.

In the above configuration, the hook portion can be smoothly hooked onto the engaging portion.

In one or more embodiments, the rear cover may include a cover tube disposed around the housing tube. The circumferential restriction portion may be arranged radially outward from the cover cylinder portion.

In the above configuration, the outer circumferential surface of the housing cylindrical portion and the inner circumferential surface of the cover cylindrical portion can face each other, so that the rear cover rotates smoothly until rotation in the circumferential direction is regulated by the circumferential direction regulating portion. be able to.

In one or more embodiments, the rear cover may have a rib portion that protrudes radially outward from the outer peripheral surface of the cover cylinder portion. The rib portion may contact the tip portion of the hook member while the hook portion is hooked onto the engaging portion.

In the above configuration, the movement of the rear cover in the circumferential direction is restricted by the contact between the tip of the hook member and the rib.

In one or more embodiments, the hook portion may restrict movement of the rear cover to the other side in the circumferential direction, and the tip portion of the hook member may restrict movement of the rear cover to one side in the circumferential direction.

With the above configuration, movement of the rear cover in the circumferential direction is appropriately regulated.

In one or more embodiments, the rear cover may include a lower plate portion disposed radially outward from the hook member. A hole may be provided in the lower plate portion.

In the above configuration, the hook member can be accessed through the hole. For example, when releasing the fixation of the rear cover, a jig can be inserted into the hole to move the hook member.

In one or more embodiments, the power tool may include an elastic member supported by the motor housing and disposed between the cover cylinder and the lower plate.

In the above configuration, the elastic member suppresses rattling of the rear cover.

In one or more embodiments, the power tool includes a motor having a rotor and a stator that rotate around a rotation axis extending in the front-rear direction, and a motor that is disposed in front of the motor and that rotates based on the rotational force of the rotor. a left motor accommodating part and a right motor accommodating part that accommodate the motor; a grip part extending downward from each of the left motor accommodating part and the right motor accommodating part; and a rear rotor bearing that supports the rear part of the rotor. After the left motor housing part and the right motor housing part are fixed, the left motor housing part is fixed to the left motor housing part and the right motor housing part only by engagement with the rear part of the left motor housing part and the right motor housing part, and the rear rotor bearing is fixed to the left motor housing part and the right motor housing part. and a rear cover for holding the.

In the above configuration, the rear cover is fixed to the motor housing portion simply by engaging the rear cover with the rear portion of the motor housing portion without using screws. Since screws are not required, there is no need to provide a boss portion on the rear cover and the motor housing portion. Therefore, increasing the size of the power tool is suppressed. Further, since screws are not required, deterioration in the ease of assembling the power tool is suppressed.

In one or more embodiments, the left motor housing and the right motor housing may be secured by a plurality of screws, and the screws may be located forward of the rotor core of the rotor.

In the above configuration, the rear cover is fixed to the motor housing portion simply by engaging the rear cover with the rear portion of the motor housing portion without using screws. Therefore, increasing the size of the power tool is suppressed. Furthermore, deterioration in the ease of assembling the power tool is suppressed.

In one or more embodiments, the rear cover is disposed on the left and right sides of the left motor housing part and the right motor housing part, thereby preventing separation of the rear part of the left motor housing part and the rear part of the right motor housing part. It's okay.

In the above configuration, the rear cover prevents the left motor accommodating portion and the right motor accommodating portion from being separated.

In one or more embodiments, exhaust ports extending up and down may be disposed on each of the left and right sides of the rear cover.

In the above configuration, the air that has cooled the motor is exhausted from the exhaust port.

Hereinafter, embodiments will be described with reference to the drawings. In the embodiment, the positional relationship of each part will be described using terms such as left, right, front, rear, upper, and lower. These terms indicate relative positions or directions with respect to the center of the power tool 1. The power tool 1 has a motor 6 as a power source.

In the embodiment, a direction parallel to the rotation axis AX of the motor 6 is appropriately referred to as an axial direction, a direction that goes around the rotation axis AX is appropriately referred to as a circumferential direction or a rotation direction, and a radial direction of the rotation axis AX. is appropriately referred to as the radial direction.

The rotation axis AX extends in the front-rear direction. One axial side is the front side, and the other axial side is the rear side. Further, in the radial direction, a position close to or approaching the rotation axis AX is appropriately referred to as the radially inner side, and a position far from the rotation axis AX or a direction away from the rotation axis AX is appropriately referred to as the radially outer side. Further, one predetermined direction in the circumferential direction is appropriately referred to as one side in the circumferential direction, and the side opposite to the one side in the circumferential direction is appropriately referred to as the other side in the circumferential direction.

[1] First Embodiment The first embodiment will be described.

[Electric tool]
FIG. 1 is a perspective view from the front side showing a power tool 1 according to an embodiment. FIG. 2 is a side view showing the power tool 1 according to the embodiment. FIG. 3 is a perspective view of the upper part of the power tool 1 according to the embodiment from the rear side. FIG. 4 is a diagram of the upper part of the power tool 1 according to the embodiment viewed from the rear side. FIG. 5 is a side view showing the upper part of the power tool 1 according to the embodiment. FIG. 6 is a longitudinal sectional view showing the upper part of the power tool 1 according to the embodiment. FIG. 7 is a cross-sectional view showing the upper part of the power tool 1 according to the embodiment.

In the embodiment, the power tool 1 is an impact driver, which is a type of screw tightening tool. The power tool 1 includes a housing 2, a rear cover 3, a hammer case 4, a bearing box 24, a hammer case cover 51, a motor 6, a reduction mechanism 7, a spindle 8, a striking mechanism 9, and an anvil 10. , a tool holding mechanism 11, a fan 12, a battery mounting part 13, a trigger lever 14, a forward/reverse switching lever 15, a hand mode switching button 16, a light assembly 18, and a light cover 52.

The housing 2 is made of synthetic resin. In the embodiment, the housing 2 is made of nylon. The housing 2 includes a left housing 2L and a right housing 2R disposed on the right side of the left housing 2L. The left housing 2L and the right housing 2R are fixed with a plurality of screws 2S. The housing 2 is composed of a pair of half housings.

The housing 2 includes a motor accommodating portion 21, a grip portion 22, and a battery holding portion 23.

The motor accommodating portion 21 accommodates the motor 6. The motor accommodating portion 21 accommodates at least a portion of the hammer case 4. The motor housing portion 21 is cylindrical.

In the following description, a portion of the left housing 2L that constitutes the motor accommodating portion 21 will be appropriately referred to as a left motor accommodating portion, and a portion of the right housing 2R that constitutes the motor accommodating portion 21 will be appropriately referred to as a left motor accommodating portion. .

The grip portion 22 is held by the operator. The grip portion 22 extends downward from the motor housing portion 21 . The grip portion 22 extends downward from each of the left motor housing portion and the right motor housing portion. The trigger lever 14 is provided at the top of the grip section 22.

The battery holding section 23 holds the battery pack 25 via the battery mounting section 13. The battery holding section 23 is connected to the lower end of the grip section 22 . The outer dimensions of the battery holding part 23 are larger than the outer dimensions of the grip part 22 in each of the front-rear direction and the left-right direction.

The rear cover 3 is arranged to cover the opening at the rear end of the motor accommodating portion 21 . The rear cover 3 is arranged on the rear side of the motor housing section 21. The rear cover 3 accommodates at least a portion of the fan 12. The fan 12 is arranged inside the rear cover 3. The rear cover 3 holds the rear rotor bearing 37. The rear cover 3 is made of synthetic resin. The rear cover 3 is fixed to the rear end of the motor accommodating portion 21.

The motor housing portion 21 has an intake port 19 . The rear cover 3 has an exhaust port 20. Air in the external space of the housing 2 flows into the internal space of the housing 2 through the intake port 19. Air in the internal space of the housing 2 flows out to the external space of the housing 2 through the exhaust port 20.

Hammer case 4 accommodates at least a portion of deceleration mechanism 7, spindle 8, striking mechanism 9, and at least a portion of anvil 10. Hammer case 4 is made of metal. In the embodiment, the hammer case 4 is made of aluminum. Hammer case 4 is cylindrical. The hammer case 4 includes a large cylindrical portion 4A, a small cylindrical portion 4B, and a connecting portion 4C. The small cylindrical portion 4B is arranged on the front side of the large cylindrical portion 4A. The front end of the large cylindrical portion 4A and the rear end of the small cylindrical portion 4B are connected via a connecting portion 4C. The connecting portion 4C is annular. The outer diameter of the large cylindrical portion 4A is larger than the outer diameter of the small cylindrical portion 4B. The inner diameter of the large cylindrical portion 4A is larger than the inner diameter of the small cylindrical portion 4B.

The bearing box 24 houses at least a portion of the speed reduction mechanism 7. Bearing box 24 holds a front rotor bearing 38 and a spindle bearing 44. The bearing box 24 is made of metal. The bearing box 24 is fixed to the rear part of the hammer case 4. The bearing box 24 has a rear annular portion 24A and a front annular portion 24B. The front annular portion 24B is disposed further forward than the rear annular portion 24A. The front end of the rear annular portion 24A and the rear end of the front annular portion 24B are connected via a connecting portion 24C. The connecting portion 24C is annular. The outer diameter of the rear annular portion 24A is smaller than the outer diameter of the front annular portion 24B. The inner diameter of the rear annular portion 24A is smaller than the inner diameter of the front annular portion 24B. The bearing box 24 and the hammer case 4 may be fixed by a threaded portion or by fitting. For example, a thread may be formed on the outer circumference of the front annular portion 24B, and a thread groove may be formed on the inner circumference of the large cylinder portion 4A. The bearing box 24 and the hammer case 4 may be fixed by coupling the threads of the front annular portion 24B to the thread grooves of the large cylinder portion 4A. The bearing box 24 and the hammer case 4 may be fixed by fitting the front annular portion 24B into the large cylinder portion 4A. The front rotor bearing 38 is arranged radially inside the rear annular portion 24A. The spindle bearing 44 is arranged radially inside the connecting portion 24C.

Hammer case 4 is sandwiched between left housing 2L and right housing 2R. A rear portion of the hammer case 4 is accommodated in a motor accommodating portion 21 . The hammer case 4 is connected to the front part of the motor accommodating part 21. The bearing box 24 is fixed to the motor accommodating portion 21 and the hammer case 4, respectively.

Hammer case cover 51 protects hammer case 4. The hammer case cover 51 suppresses contact between the hammer case 4 and objects around the hammer case 4. Hammer case cover 51 is arranged to cover the outer peripheral surface of large cylinder portion 4A. Note that the hammer case cover 51 may be omitted.

The motor 6 is a power source for the power tool 1. The motor 6 is an inner rotor type brushless motor. Motor 6 has a stator 26 and a rotor 27. Stator 26 is supported by motor accommodating portion 21 . At least a portion of rotor 27 is arranged inside stator 26. Rotor 27 rotates relative to stator 26 . The rotor 27 rotates around a rotation axis AX that extends in the front-rear direction.

The stator 26 includes a stator core 28 , a rear insulator 29 , a front insulator 30 , and a coil 31 .

Stator core 28 includes a plurality of laminated steel plates. A steel plate is a metal plate whose main component is iron. Stator core 28 is cylindrical. Stator core 28 is arranged radially outside of rotor 27. Stator core 28 has a plurality of teeth that support coil 31.

Each of the rear insulator 29 and the front insulator 30 is an electrically insulating member made of synthetic resin. Each of the rear insulator 29 and the front insulator 30 electrically insulates the stator core 28 and the coil 31. The rear insulator 29 is fixed to the rear of the stator core 28. Front insulator 30 is fixed to the front of stator core 28 . The rear insulator 29 is arranged to cover a part of the surface of the teeth. The front insulator 30 is arranged to cover a part of the surface of the teeth.

The coil 31 is attached to the stator core 28 via the rear insulator 29 and the front insulator 30. A plurality of coils 31 are arranged. The coil 31 is arranged around the teeth of the stator core 28 via the rear insulator 29 and the front insulator 30. Coil 31 and stator core 28 are electrically insulated by front insulator 30 and rear insulator 29. The plurality of coils 31 are connected via fusing terminals 36.

The rotor 27 rotates around the rotation axis AX. The rotor 27 includes a rotor core 32, a rotor shaft 33, a rotor magnet 34A, and a sensor magnet 34B.

Each of the rotor core 32 and the rotor shaft 33 is made of steel. In the embodiment, rotor core 32 and rotor shaft 33 are integral. The rear part of the rotor shaft 33 protrudes rearward from the rear end surface of the rotor core 32. The front portion of the rotor shaft 33 protrudes forward from the front end surface of the rotor core 32.

Rotor magnet 34A is fixed to rotor core 32. In the embodiment, rotor magnets 34A are arranged around rotor core 32. Sensor magnet 34B is fixed to rotor core 32. In the embodiment, the sensor magnet 34B is arranged on the front end surface of the rotor core 32.

The left motor accommodating part and the right motor accommodating part are fixed with a plurality of screws 2S. As shown in FIG. 6, all of the plurality of screws 2S that fix the left motor accommodating part and the right motor accommodating part are arranged in front of the rotor core 32 of the rotor 27.

A sensor board 35 is attached to the front insulator 30. The sensor board 35 is fixed to the front insulator 30 with screws 30S. The sensor board 35 includes an annular circuit board and a rotation detection element supported by the circuit board. At least a portion of the sensor substrate 35 faces the front end surface of the sensor magnet 34B. The rotation detection element detects the position of the rotor 27 in the rotational direction by detecting the position of the sensor magnet 34B.

The rear part of the rotor 27 is supported by a rear rotor bearing 37. The front part of the rotor 27 is supported by a front rotor bearing 38. In the embodiment, the rear rotor bearing 37 supports the rear end of the rotor shaft 33. The front rotor bearing 38 supports the front end of the rotor shaft 33. A rear end portion of the rotor shaft 33 is rotatably supported by a rear rotor bearing 37. A front end portion of the rotor shaft 33 is rotatably supported by a front rotor bearing 38. The rear rotor bearing 37 is held by the rear cover 3. The front rotor bearing 38 is held in the bearing box 24.

The front end portion of the rotor shaft 33 is disposed in the internal space of the hammer case 4 through an opening provided in the rear annular portion 24A of the bearing box 24.

A pinion gear 41 is fixed to the front end of the rotor shaft 33. The pinion gear 41 is connected to at least a portion of the speed reduction mechanism 7. The rotor shaft 33 is connected to the speed reduction mechanism 7 via a pinion gear 41.

The speed reduction mechanism 7 connects the rotor shaft 33 and the spindle 8. The gears of the reduction mechanism 7 are driven by the rotor 27. The speed reduction mechanism 7 transmits the rotation of the rotor 27 to the spindle 8. The speed reduction mechanism 7 rotates the spindle 8 at a rotation speed lower than the rotation speed of the rotor shaft 33. The speed reduction mechanism 7 is arranged on the front side of the stator 26. The speed reduction mechanism 7 includes a planetary gear mechanism.

The speed reduction mechanism 7 includes a plurality of planetary gears 42 arranged around a pinion gear 41 and an internal gear 43 arranged around the plurality of planetary gears 42. Each of the pinion gear 41, planetary gear 42, and internal gear 43 is housed in the hammer case 4. Each of the plurality of planetary gears 42 meshes with the pinion gear 41. The planetary gear 42 is rotatably supported by the spindle 8 via a pin 42P. The spindle 8 is rotated by a planetary gear 42. Internal gear 43 has internal teeth that mesh with planetary gear 42 .

Internal gear 43 is fixed to large cylinder portion 4A of hammer case 4. Internal gear 43 is always unrotatable with respect to hammer case 4.

When the rotor shaft 33 is rotated by the drive of the motor 6, the pinion gear 41 rotates, and the planetary gear 42 revolves around the pinion gear 41. The planetary gear 42 revolves while meshing with the internal teeth of the internal gear 43. Due to the revolution of the planetary gear 42, the spindle 8, which is connected to the planetary gear 42 via the pin 42P, rotates at a rotation speed lower than the rotation speed of the rotor shaft 33.

The spindle 8 is rotated by the motor 6 around a rotation axis AX. The spindle 8 is rotated by a rotor 27. The spindle 8 is rotated by the rotational force of the rotor 27 transmitted via the speed reduction mechanism 7. Spindle 8 transmits the rotational force of motor 6 to anvil 10 via ball 48 and hammer 47. At least a portion of the spindle 8 is arranged ahead of the motor 6. The spindle 8 is arranged further forward than the stator 26. At least a portion of the spindle 8 is located further forward than the rotor 27. At least a portion of the spindle 8 is arranged on the front side of the speed reduction mechanism 7. At least a portion of the spindle 8 is arranged on the rear side of the anvil 10.

The spindle 8 includes a spindle shaft portion 8A, a first flange portion 8B, a second flange portion 8C, a connecting portion 8D, and a spindle convex portion 8F.

The spindle shaft portion 8A has a rod shape that is long in the front-rear direction. The central axis of the spindle shaft portion 8A and the rotation axis AX coincide. The first flange portion 8B extends radially outward from the rear end portion of the outer peripheral surface of the spindle shaft portion 8A. The second flange portion 8C is arranged on the rear side of the first flange portion 8B. The second flange portion 8C is annular. The connecting portion 8D connects a portion of the first flange portion 8B and a portion of the second flange portion 8C. The spindle convex portion 8F projects forward from the front end of the spindle shaft portion 8A. A front end portion of the pin 42P is supported by the first flange portion 8B. The rear end portion of the pin 42P is supported by the second flange portion 8C. The planetary gear 42 is arranged between the first flange part 8B and the second flange part 8C. The planetary gear 42 is rotatably supported by the first flange portion 8B and the second flange portion 8C via a pin 42P. The spindle bearing 44 is arranged inside the cylindrical portion of the spindle 8 that protrudes rearward from the rear surface of the second flange portion 8C. The spindle bearing 44 holds the cylindrical portion of the spindle 8. Spindle bearing 44 is held in bearing box 24.

The striking mechanism 9 is driven by the motor 6. The rotational force of the motor 6 is transmitted to the striking mechanism 9 via the deceleration mechanism 7 and the spindle 8. The striking mechanism 9 strikes the anvil 10 in the rotational direction based on the rotational force of the spindle 8 rotated by the motor 6. The striking mechanism 9 includes a hammer 47, a ball 48, a coil spring 49, and a washer 50. A striking mechanism 9 including a hammer 47, a ball 48, a coil spring 49, and a washer 50 is housed in the large cylindrical portion 4A of the hammer case 4.

The hammer 47 is arranged on the front side of the deceleration mechanism 7. Hammer 47 is arranged around spindle 8 . The hammer 47 is arranged around the spindle shaft portion 8A. The hammer 47 is held by the spindle shaft portion 8A. Ball 48 is arranged between spindle 8 and hammer 47.

The hammer 47 includes a body portion 47A, an outer cylinder portion 47B, an inner cylinder portion 47C, and a hammer protrusion 47D. The body portion 47A is arranged around the spindle shaft portion 8A. The body portion 47A is annular. Each of the outer cylinder part 47B and the inner cylinder part 47C protrudes rearward from the body part 47A. The outer cylinder part 47B is arranged radially outward than the inner cylinder part 47C. A recess 47E is defined by the rear surface of the body portion 47A, the inner peripheral surface of the outer cylinder portion 47B, and the outer peripheral surface of the inner cylinder portion 47C. The recess 47E is provided so as to be recessed forward from the rear end of the hammer 47. The recess 47E is ring-shaped. The spindle shaft portion 8A is arranged radially inward than the body portion 47A and the inner cylinder portion 47C. The hammer projection 47D projects forward from the body 47A. Two hammer protrusions 47D are provided.

Hammer 47 is rotated by motor 6. The rotational force of the motor 6 is transmitted to the hammer 47 via the speed reduction mechanism 7 and the spindle 8. The hammer 47 is rotatable together with the spindle 8 based on the rotational force of the spindle 8 rotated by the motor 6. The rotational axis of the hammer 47, the rotational axis of the spindle 8, and the rotational axis AX of the motor 6 coincide with each other. Hammer 47 rotates around rotation axis AX.

Washer 50 is arranged inside recess 47E. The washer 50 is supported by the hammer 47 via a plurality of balls 54. The ball 54 is arranged further forward than the washer 50. Ball 54 is arranged between the rear surface of body portion 47A and the front surface of washer 50.

The coil spring 49 is arranged around the spindle shaft portion 8A. A rear end portion of the coil spring 49 is supported by the first flange portion 8B. The front end of the coil spring 49 is disposed inside the recess 47E and supported by the washer 50. The coil spring 49 constantly generates an elastic force that moves the hammer 47 forward.

Ball 48 is made of metal such as steel. The ball 48 is arranged between the spindle shaft portion 8A and the body portion 47A. The spindle shaft portion 8A has a spindle groove 8G in which at least a portion of the ball 48 is disposed. The spindle groove 8G is provided in a part of the outer peripheral surface of the spindle shaft portion 8A. The hammer 47 has a hammer groove 47G in which at least a portion of the ball 48 is arranged. The hammer groove 47G is provided in a part of the inner peripheral surface of the body part 47A and the inner cylinder part 47C.

Two balls 48 are provided. Two spindle grooves 8G are provided on the outer peripheral surface of the spindle shaft portion 8A. Two hammer grooves 47G are provided on the inner peripheral surfaces of the body portion 47A and the inner cylinder portion 47C. One ball 48 is arranged between one spindle groove 8G and one hammer groove 47G. The other ball 48 is arranged between the other spindle groove 8G and the other hammer groove 47G. The ball 48 can roll inside the spindle groove 8G and inside the hammer groove 47G, respectively. The hammer 47 is movable along with the ball 48. The spindle 8 and the hammer 47 can move relative to each other in the axial direction and rotational direction within a movable range defined by the spindle groove 8G and the hammer groove 47G.

The anvil 10 is placed in front of the motor 6. The anvil 10 is an output section of the power tool 1 that rotates based on the rotational force of the rotor 27. At least a portion of the anvil 10 is located more forward than the spindle 8. At least a portion of the anvil 10 is located more forward than the hammer 47. The anvil 10 is struck by the hammer 47 in the rotational direction.

Anvil 10 has an anvil shaft portion 10A and an anvil projection portion 10B. The anvil shaft portion 10A has a rod shape that is long in the front-rear direction. The central axis of the anvil shaft portion 10A and the rotation axis AX coincide. The anvil protrusion 10B is provided at the rear end of the anvil shaft portion 10A. The anvil projection portion 10B projects radially outward from the rear end portion of the anvil shaft portion 10A. Two anvil protrusions 10B are provided.

A tool hole 10C is provided in the front end surface of the anvil 10. An anvil recess 10D is provided on the rear end surface of the anvil 10. The tool hole 10C is formed so as to extend rearward from the front end surface of the anvil shaft portion 10A. The tip tool is inserted into the tool hole 10C. The tip tool is attached to the anvil 10. The anvil recess 10D is provided so as to be depressed forward from the rear end surface of the anvil 10. A spindle convex portion 8F is arranged in the anvil concave portion 10D.

Anvil 10 is rotatably supported by anvil bearing 46. The axis of rotation of the anvil 10, the axis of rotation of the hammer 47, the axis of rotation of the spindle 8, and the axis of rotation AX of the motor 6 coincide with each other. Anvil 10 rotates around a rotation axis AX. Anvil bearing 46 is arranged around anvil shaft portion 10A. An O-ring 45 is disposed between the anvil bearing 46 and the anvil shaft portion 10A. The anvil bearing 46 is arranged inside the small cylinder portion 4B of the hammer case 4. The anvil bearing 46 is held in the small cylindrical portion 4B of the hammer case 4. Hammer case 4 supports anvil 10 via anvil bearing 46. The anvil bearing 46 rotatably supports the front portion of the anvil shaft portion 10A. In the embodiment, two anvil bearings 46 are arranged in the front-rear direction.

A washer 56 and a support member 57 are arranged on the front side of the anvil protrusion 10B. The support member 57 is arranged so as to be in contact with the rear surface of the connecting portion 4C and the rear surface of the outer ring of the anvil bearing 46. The support member 57 is ring-shaped. The support member 57 prevents the anvil bearing 46 from coming off backward from the small cylinder portion 4B. Further, the support member 57 suppresses contact between the front surface of the anvil protrusion 10B and the hammer case 4. The washer 56 supports the support member 57 from behind. The washer 56 is arranged in a groove provided in the inner circumferential surface of the large cylinder portion 4A.

Hammer protrusion 47D can contact anvil protrusion 10B. When the motor 6 is driven while the hammer protrusion 47D and the anvil protrusion 10B are in contact with each other, the anvil 10 rotates together with the hammer 47 and the spindle 8.

The anvil 10 is struck by the hammer 47 in the rotational direction. For example, in a screw tightening operation, when the load acting on the anvil 10 becomes high, a situation may occur where the anvil 10 cannot be rotated only by the load of the coil spring 49. When the anvil 10 cannot be rotated only by the load of the coil spring 49, the anvil 10 and the hammer 47 stop rotating. The spindle 8 and the hammer 47 are movable relative to each other in the axial direction and the circumferential direction via the ball 48. Even when the hammer 47 stops rotating, the spindle 8 continues to rotate due to the power generated by the motor 6. When the spindle 8 rotates while the rotation of the hammer 47 is stopped, the ball 48 moves rearward while being guided by each of the spindle groove 8G and the hammer groove 47G. The hammer 47 receives force from the ball 48 and moves rearward with the ball 48. That is, the hammer 47 moves rearward as the spindle 8 rotates while the rotation of the anvil 10 is stopped. By moving the hammer 47 backward, the contact between the hammer protrusion 47D and the anvil protrusion 10B is released.

As described above, the coil spring 49 constantly generates an elastic force that moves the hammer 47 forward. The hammer 47 that has moved backward is moved forward by the elastic force of the coil spring 49. When the hammer 47 moves forward, it receives a rotational force from the ball 48. That is, the hammer 47 moves forward while rotating. When the hammer 47 moves forward while rotating, the hammer 47 comes into contact with the anvil protrusion 10B while rotating. As a result, the anvil protrusion 10B is struck in the rotational direction by the hammer protrusion 47D of the hammer 47. Both the power of the motor 6 and the inertial force of the hammer 47 act on the anvil 10. Therefore, the anvil 10 can be rotated around the rotation axis AX with high torque.

Tool holding mechanism 11 is arranged around the front of anvil 10 . The tool holding mechanism 11 holds the tip tool inserted into the tool hole 10C of the anvil 10. The tool holding mechanism 11 is capable of attaching and detaching a tip tool.

The tool holding mechanism 11 includes a ball 71, a leaf spring 72, a sleeve 73, a coil spring 74, and a positioning member 75.

The anvil 10 has a support recess 76 that supports the ball 71. The support recess 76 is formed on the outer surface of the anvil shaft portion 10A. In the embodiment, two support recesses 76 are formed in the anvil shaft portion 10A.

Ball 71 is movably supported by anvil 10. Ball 71 is placed in support recess 76 . One ball 71 is arranged in one support recess 76 .

A through hole connecting the inner surface of the support recess 76 and the inner surface of the tool hole 10C is formed in the anvil shaft portion 10A. The diameter of the ball 71 is smaller than the diameter of the through hole. The ball 71 is disposed inside the tool hole 10C with at least a portion of the ball 71 supported in the support recess 76. The ball 71 can fix the tip tool inserted into the tool hole 10C. The ball 71 is movable between an engagement position for fixing the tip tool and a release position for releasing the fixation of the tip tool.

Leaf spring 72 generates an elastic force that moves ball 71 to the engagement position. Leaf spring 72 is arranged around anvil shaft portion 10A. Leaf spring 72 generates elastic force that moves ball 71 forward.

The sleeve 73 is a cylindrical member. Sleeve 73 is arranged around anvil shaft portion 10A. The sleeve 73 is movable in the axial direction around the anvil shaft portion 10A. The sleeve 73 can prevent the ball 71 placed in the engaged position from escaping from the engaged position. By moving the sleeve 73 in the axial direction, the ball 71 can be moved from the engagement position to the release position.

The sleeve 73 is movable around the anvil shaft portion 10A between a blocking position where the ball 71 is prevented from moving radially outward and a permitting position where the ball 71 is allowed to move radially outward.

By placing the sleeve 73 in the blocking position, the ball 71 placed in the engagement position is prevented from moving radially outward. That is, by disposing the sleeve 73 in the blocking position, the ball 71 disposed in the engagement position is prevented from escaping from the engagement position. By arranging the sleeve 73 in the blocking position, the state in which the tip tool is fixed by the ball 71 is maintained.

By moving the sleeve 73 to the allowable position, the ball 71 located at the engagement position is allowed to move radially outward. When the sleeve 73 is moved to the allowable position, it changes the state in which the ball 71 can be moved from the engagement position to the release position. That is, by disposing the sleeve 73 in the permissible position, the ball 71 disposed in the engagement position is allowed to escape from the engagement position. By arranging the sleeve 73 at the permissible position, the state in which the tip tool is fixed by the ball 71 can be released.

The coil spring 74 generates an elastic force so that the sleeve 73 moves to the blocking position. Coil spring 74 is arranged around anvil shaft portion 10A. The blocking position is defined on the rear side of the allowable position. The coil spring 74 generates an elastic force that moves the sleeve 73 backward.

The positioning member 75 is a ring-shaped member fixed to the outer surface of the anvil shaft portion 10A. The positioning member 75 is fixed at a position where it can face the rear end of the sleeve 73. The positioning member 75 positions the sleeve 73 in the blocking position. The sleeve 73, which is given an elastic force to move rearward by the coil spring 74, is positioned at the blocking position by contacting the positioning member 75.

The fan 12 is arranged on the rear side of the stator 26 of the motor 6. Fan 12 generates airflow for cooling motor 6. Fan 12 is fixed to at least a portion of rotor 27. The fan 12 is fixed to the rear part of the rotor shaft 33 via a bush 12A. Fan 12 is arranged between rear rotor bearing 37 and stator 26. The fan 12 is rotated by the rotation of the rotor 27. As the rotor shaft 33 rotates, the fan 12 rotates together with the rotor shaft 33. As the fan 12 rotates, air in the external space of the housing 2 flows into the internal space of the housing 2 through the intake port 19. The air that has flowed into the internal space of the housing 2 cools the motor 6 by flowing through the internal space of the housing 2 . The air flowing through the internal space of the housing 2 flows out into the external space of the housing 2 through the exhaust port 20 as the fan 12 rotates.

The battery mounting part 13 is arranged at the lower part of the battery holding part 23. The battery mounting section 13 is connected to the battery pack 25. The battery pack 25 is attached to the battery attachment section 13. The battery pack 25 is removably attachable to the battery mounting section 13. The battery pack 25 is mounted on the battery mounting section 13 by being inserted into the battery mounting section 13 from the front of the battery holding section 23 . The battery pack 25 is removed from the battery mounting section 13 by being pulled forward from the battery mounting section 13 . Battery pack 25 includes a secondary battery. In embodiments, battery pack 25 includes a rechargeable lithium ion battery. By being attached to the battery attachment part 13, the battery pack 25 can supply power to the power tool 1. The motor 6 is driven based on electric power supplied from the battery pack 25.

The trigger lever 14 is provided on the grip section 22. The trigger lever 14 is operated by an operator to start the motor 6. By operating the trigger lever 14, the motor 6 is switched between driving and stopping.

The forward/reverse switching lever 15 is provided on the upper part of the grip section 22. The forward/reverse switching lever 15 is operated by an operator. By operating the forward/reverse switching lever 15, the rotation direction of the motor 6 is switched from one of the forward rotation direction and the reverse rotation direction to the other. By switching the rotation direction of the motor 6, the rotation direction of the spindle 8 is switched.

The hand mode switching button 16 is provided above the trigger lever 14. The hand mode switching button 16 is operated by the operator. A circuit board 16A and a switch 16B are arranged behind the hand mode switching button 16. Switch 16B is mounted on the front surface of circuit board 16A. The hand mode switching button 16 is arranged on the front side of the switch 16B. When the hand mode switching button 16 is pushed backward, the switch 16B is activated and an operation signal is output from the circuit board 16A. The operation signal output from the circuit board 16A is transmitted to a controller (not shown). The controller switches the control mode of the motor 6 based on the operation signal output from the circuit board 16A.

Light assembly 18 emits illumination light. Light assembly 18 illuminates anvil 10 and the periphery of anvil 10 with illumination light. Light assembly 18 illuminates the front of anvil 10 with illumination light. Further, the light assembly 18 illuminates the tip tool attached to the anvil 10 and the periphery of the tip tool with illumination light. In the embodiment, the light assembly 18 is arranged around the small tube portion 4B. The light assembly 18 includes a circuit board 18A, a light emitting element 18B supported by the circuit board 18A, and an optical member 18C through which light emitted from the light emitting element 18B passes. The optical member 18C is ring-shaped.

Light cover 52 protects light assembly 18. The light cover 52 suppresses contact between the light assembly 18 and objects around the light assembly 18. The light cover 52 is arranged around the optical member 18C.

[Rear cover]
FIG. 8 is an exploded perspective view from the rear side showing the upper part of the power tool 1 according to the embodiment. FIG. 9 is a perspective view from the front side showing the rear cover 3 according to the embodiment. FIG. 10 is a diagram of the rear cover 3 according to the embodiment viewed from the right side. FIG. 11 is a diagram of the rear cover 3 according to the embodiment viewed from the left side. FIG. 12 is a diagram of the rear cover 3 according to the embodiment viewed from above. FIG. 13 is a view of the rear cover 3 according to the embodiment viewed from below. FIG. 14 is a diagram of the rear cover 3 according to the embodiment viewed from the rear side. FIG. 15 is a diagram of the rear cover 3 according to the embodiment viewed from the front side.

The rear cover 3 is fixed to the rear part of the motor accommodating part 21 without using screws. The rear cover 3 is removable from the motor accommodating portion 21 . The rear cover 3 includes a cover plate portion 301, a cover cylinder portion 302, a pillar portion 303, a convex portion 304, a housing portion 305, a cover claw portion 306, a central back plate portion 307, and a side back plate portion 308. , a central lower plate portion 309 , a side lower plate portion 310 , a rib portion 311 , an engaging portion 312 , and a hole portion 313 .

The cover plate portion 301 has a disk shape. The cover plate section 301 is arranged behind the fan 12. The cover cylinder portion 302 protrudes forward from the peripheral edge of the cover plate portion 301. The exhaust ports 20 are provided on the left and right sides of the cover cylinder section 302, respectively. The exhaust port 20 has a slit shape that is long in the vertical direction. The exhaust port 20 is arranged on each of the left and right side surfaces of the rear cover 3 so as to extend vertically. The pillar portion 303 is provided at the center of the exhaust port 20 in the vertical direction.

The convex portion 304 is provided at the center of the front surface of the cover plate portion 301. The convex portion 304 has a cylindrical shape. The convex portion 304 projects forward from the front surface of the cover plate portion 301. The housing portion 305 is defined inside the convex portion 304 . The rear rotor bearing 37 is arranged in the housing portion 305. The outer peripheral portion of the rear rotor bearing 37 is supported by the convex portion 304. The rear part of the rear rotor bearing 37 is supported by the cover plate part 301.

The cover claw portion 306 is provided on the inner circumferential surface of the cover cylinder portion 302. The cover claw portion 306 protrudes radially inward from the inner circumferential surface of the cover cylinder portion 302. A plurality of cover claw portions 306 are provided at intervals in the circumferential direction. In the embodiment, two cover claw portions 306 are provided at intervals in the circumferential direction. The cover claw part 306 includes a cover claw part 306L arranged on the left side of the center of the cover plate part 301, and a cover claw part 306R arranged on the right side of the center of the cover plate part 301.

Each of the central back plate part 307 and the side back plate parts 308 is provided so as to protrude downward from the lower part of the cover cylinder part 302. The central back plate portion 307 slopes downward and forward. The side back plate portions 308 are arranged more forward than the center back plate portion 307. In the left-right direction, the lateral back plate portions 308 are arranged on both sides of the center back plate portion 307. The side backboard portions 308 include a side backboard portion 308L located on the left side of the center backboard portion 307, and a side backboard portion 308R located on the right side of the center backboard portion 307. including.

Each of the central lower plate portion 309 and the lateral lower plate portions 310 is arranged radially outward from the cover cylinder portion 302. In the radial direction, the distance from the center of the cover plate portion 301 to the central lower plate portion 309 is longer than the distance from the center of the cover plate portion 301 to the side lower plate portions 310. The central lower plate part 309 is connected to the lower end of the central back plate part 307. The central lower plate portion 309 is arranged to extend from the lower end of the central back plate portion 307 toward the front side. In the left-right direction, the lateral lower plate parts 310 are arranged on both sides of the central lower plate part 309. The lateral lower plate part 310 includes a lateral lower plate part 310L arranged on the left side of the central lower plate part 309, and a lateral lower plate part 310R arranged on the right side of the central lower plate part 309. including. A portion of the lower side plate portion 310L is connected to the lower end of the side back plate portion 308L. A portion of the lower side plate portion 310L is connected to the left end portion of the side back plate portion 308L. A left end portion of the lower side plate portion 310L is connected to the outer circumferential surface of the cover cylinder portion 302. The lateral lower plate portion 310L is arranged to extend forward from the peripheral edge of the lateral back plate portion 308L. A portion of the lower side plate portion 310R is connected to the lower end of the side back plate portion 308R. A portion of the lower side plate portion 310R is connected to the right end portion of the side back plate portion 308R. A right end portion of the lower side plate portion 310R is connected to the outer peripheral surface of the cover cylinder portion 302. The lateral lower plate portion 310R is arranged to extend forward from the peripheral edge of the lateral back plate portion 308R.

The rib portion 311 protrudes radially outward from the outer peripheral surface of the cover cylinder portion 302. In the left-right direction, the rib portion 311 is arranged on the right side of the center of the cover plate portion 301. A radially inner end of the rib portion 311 is connected to the outer circumferential surface of the cover cylinder portion 302. The radially outer end of the rib portion 311 is connected to the right end of the upper surface of the central lower plate portion 309 . Note that the radially outer end of the rib portion 311 may be connected to the left end of the upper surface of the lateral lower plate portion 310R. The rear surface of the rib portion 311 is connected to the front surface of the central back plate portion 307. Note that the rear surface of the rib portion 311 may be connected to the front surface of the side back plate portion 308R.

The engaging portion 312 is provided so as to protrude radially inward from the upper surface of the central lower plate portion 309. In the left-right direction, the engaging portion 312 is arranged on the right side of the center of the cover plate portion 301.

The hole 313 is provided in the central lower plate portion 309. The hole 313 is provided so as to penetrate through the upper and lower surfaces of the central lower plate portion 309 . The hole portion 313 is provided at a position that coincides with the center of the cover plate portion 301 in the left-right direction. The hole portion 313 is provided so as to cut out a part of the central back plate portion 307.

FIG. 16 is a view of the rear part of the upper part of the power tool 1 in a state where the rear cover 3 according to the embodiment is removed, viewed from the rear side. FIG. 17 is a perspective view from the right rear side showing the rear part of the upper part of the power tool 1 with the rear cover 3 according to the embodiment removed. FIG. 18 is a perspective view from the left rear side showing the rear part of the upper part of the power tool 1 with the rear cover 3 according to the embodiment removed. FIG. 19 is a view of the upper rear part of the power tool 1 with the rear cover 3 removed, viewed from the right side. FIG. 20 is a diagram of the upper rear part of the power tool 1 in a state where the rear cover 3 according to the embodiment is removed, viewed from the left side.

The motor housing section 21 includes a cylindrical section 210, a housing cylindrical section 200, a housing claw section 201, a hook member 202, and an elastic member 204.

The cylindrical portion 210 is provided at the rear of the motor housing portion 21 . The cylindrical portion 210 has a support surface 211 facing rearward. Support surface 211 is a substantially flat surface. The support surface 211 is orthogonal to an axis parallel to the rotation axis AX. The support surface 211 is arranged to surround the rotation axis AX. The support surface 211 is ring-shaped.

The housing cylindrical portion 200 protrudes rearward from the support surface 211. The housing cylindrical portion 200 defines an opening at the rear end of the motor accommodating portion 21 . An opening at the rear end of the motor accommodating portion 21 is defined inside the housing cylinder portion 200 . The rear cover 3 is arranged to cover the opening defined by the housing cylinder section 200. Housing cylinder portion 200 is substantially cylindrical. Support surface 211 is arranged around the front end of cylindrical portion 210 .

The housing claw portion 201 is provided on the outer peripheral surface of the housing cylinder portion 200. The housing claw portion 201 protrudes radially outward from the outer peripheral surface of the housing cylinder portion 200. A plurality of housing claw portions 201 are provided at intervals in the circumferential direction. In the embodiment, two housing claw portions 201 are provided at intervals in the circumferential direction. The housing claw part 201 includes a housing claw part 201L arranged on the left side of the rotation axis AX, and a housing claw part 201R arranged on the right side of the rotation axis AX.

The housing claw portion 201 has an inclined surface 201A and a front surface 201B. The inclined surface 201A substantially faces forward. The inclined surface 201A is inclined forward toward one side in the circumferential direction. The front surface 201B faces the front side. Front surface 201B is orthogonal to an axis parallel to rotation axis AX. As shown in FIG. 19, in the housing claw portion 201R, the inclined surface 201A is arranged above the front surface 201B. As shown in FIG. 20, in the housing claw portion 201L, the inclined surface 201A is arranged lower than the front surface 201B.

Front surface 201B faces support surface 211 with a gap therebetween. A housing portion 203 is provided between the front surface 201B and the support surface 211. The housing portion 203 includes a housing portion 203R provided between the front surface 201B of the housing claw portion 201R and the support surface 211, and a housing portion 203L provided between the front surface 201B of the housing claw portion 201L and the support surface 211. .

The hook member 202 is arranged radially outward from the housing cylinder section 200. The hook member 202 is arranged on the lower side of the housing cylinder section 200. The hook member 202 has an arm portion 202A and a hook portion 202D. The arm portion 202A has an arc shape extending in the circumferential direction. A base end portion 202B of the arm portion 202A is fixed to the motor housing portion 21. The hook portion 202D is provided at the tip portion 202C of the arm portion 202A. A base end portion 202B of the arm portion 202A is fixed to the rear surface of the left housing 2L. The hook portion 202D is not fixed to the motor housing portion 21. The hook portion 202D faces the rear surface of the right housing 2R. The arm portion 202A can be elastically deformed so that the hook portion 202D moves in the radial direction.

The elastic member 204 is supported by the motor housing section 21 . The elastic member 204 has a cylindrical shape. The elastic member 204 is made of rubber, for example. A recess is provided on the rear surface of the right housing 2R. The front portion of the elastic member 204 is placed in the recess. The rear surface of the elastic member 204 faces at least a portion of the hook member 202 . In the embodiment, the rear surface of the elastic member 204 faces the hook portion 202D.

The rear cover 3 is fixed to the rear part of the motor housing part 21 by being rotated relative to the rear part of the motor housing part 21 . The motor accommodating part 21 includes a guide part that guides the rear cover 3 to one side in the circumferential direction and to the front side, a front-rear restriction part that restricts the movement of the rear cover 3 in the front-rear direction guided by the guide part, and a front-rear direction restriction part that restricts the movement of the rear cover 3 in the front-rear direction. It has a circumferential direction regulating part that regulates the circumferential movement of the rear cover 3.

The guide portion is provided on the housing claw portion 201. The guide portion includes an inclined surface 201A of the housing claw portion 201. In the embodiment, the guide portion guides the cover claw portion 306 of the rear cover 3. As the cover claw portion 306 is guided by the inclined surface 201A, the rear cover 3 is guided by the guide portion to one side in the circumferential direction and to the front side.

At least a portion of the longitudinal direction regulating portion is provided in the housing claw portion 201. The longitudinal direction regulating portion includes a front surface 201B of the housing claw portion 201. Further, the front-rear direction regulating portion includes a support surface 211 of the cylindrical portion 210. The front surface 201B restricts movement of the rear cover 3 to the rear side. The support surface 211 restricts forward movement of the rear cover 3. In the embodiment, the longitudinal direction regulating section regulates movement of the cover claw section 306 in the longitudinal direction. The cover claw portion 306 is guided by the inclined surface 201A to one side in the circumferential direction and to the front side, and then placed in the accommodation portion 203 between the front surface 201B and the support surface 211. The rear surface of the cover claw portion 306 contacts the front surface 201B. The front surface of the cover claw portion 306 contacts the support surface 211. By disposing the cover claw portion 306 in the accommodating portion 203, movement of the rear cover 3 in the front-back direction is restricted.

The circumferential restriction portion is arranged at a different position from the longitudinal restriction portion. The circumferential restriction portion includes a hook member 202. The hook portion 202D of the hook member 202 is hooked onto an engaging portion 312 provided on the rear cover 3. The rib portion 311 of the rear cover 3 contacts the tip of the hook member 202 with the hook portion 202D hooked onto the engaging portion 312. The hook portion 202D restricts movement of the rear cover 3 to the other side in the circumferential direction. The tip of the hook member 202 restricts movement of the rear cover 3 to one side in the circumferential direction.

[How to fix the rear cover]
21, 22, 23, and 24 are cross-sectional views for explaining the method of fixing the rear cover 3 according to the embodiment. 21 and 23 correspond to a cross-sectional view taken along the line AA in FIG. 6. 22 and 24 correspond to a sectional view taken along the line BB in FIG. 6.

A left housing 2L including a left motor accommodating portion and a right housing 2R including a right motor accommodating portion are fixed by a plurality of screws 2S. After the left housing 2L including the left motor accommodating part and the right housing 2R including the right motor accommodating part are fixed, the rear cover 3 is fixed to the rear part of the left motor accommodating part and the rear part of the right motor accommodating part.

When fixing the rear cover 3 to the rear part of the motor housing part 21, the cover claw part 306L is arranged on the other side in the circumferential direction than the housing claw part 201L, and the cover claw part 306R is arranged on the other side in the circumferential direction than the housing claw part 201R. The cover cylinder part 302 is arranged around the housing cylinder part 200 so that the cover cylinder part 302 is arranged around the housing cylinder part 200. Moreover, the cover cylinder part 302 is arranged around the housing cylinder part 200 so that the hook member 202 is arranged between the cover cylinder part 302 and the lower side plate part 310L.

The cover claw part 306L is arranged on the other side in the circumferential direction than the housing claw part 201L, the cover claw part 306R is arranged on the other side in the circumferential direction than the housing claw part 201R, and the cover cylinder part 302 and the lateral lower plate part 310L After the hook member 202 is placed between them, the rear cover 3 is rotated to one side in the circumferential direction with respect to the motor accommodating portion 21, as shown by the arrows in FIGS. 21 and 22. When the rear cover 3 rotates to one side in the circumferential direction, the cover claw portion 306L contacts the housing claw portion 201L, and the cover claw portion 306R contacts the housing claw portion 201R. When the rear cover 3 is further rotated to one side in the circumferential direction, the cover claw portion 306L is guided by the inclined surface 201A of the housing claw portion 201L to one side in the circumferential direction and to the front side, and the cover claw portion 306R is guided by the slope of the housing claw portion 201R. It is guided by the surface 201A to one side in the circumferential direction and to the front side. As a result, the rear cover 3, which is rotated to one side in the circumferential direction, moves forward.

After the cover claws 306 (306L, 306R) are guided by the inclined surface 201A, when the rear cover 3 is further rotated to one side in the circumferential direction, the cover claws 306L engage the front surface 201B of the housing claw 201L and the support surface 211. The cover claw part 306R is arranged in the accommodation part 203R between the front surface 201B and the support surface 211 of the housing claw part 201R. The rear surface of the cover claw portion 306L contacts the front surface 201B of the housing claw portion 201L, and the front surface of the cover claw portion 306L contacts the support surface 211. The rear surface of the cover claw portion 306R contacts the front surface 201B of the housing claw portion 201R, and the front surface of the cover claw portion 306R contacts the support surface 211. This restricts the movement of the cover claw portions 306 (306L, 306R) in the front-back direction. By restricting the movement of the cover claw portion 306 in the front-rear direction, the movement of the rear cover 3 in the front-rear direction is restricted.

A portion of the rear cover 3 including the cover claw portion 306L is arranged on the left side of the left motor accommodating portion. A portion of the rear cover 3 including the cover claw portion 306R is arranged on the right side of the right motor housing portion. The rear cover 3 is arranged on the left and right sides of the left motor accommodating part and the right motor accommodating part, thereby preventing the rear part of the left motor accommodating part and the rear part of the right motor accommodating part from being separated.

As shown in FIGS. 23 and 24, the hook portion 202D of the hook member 202 is provided on the rear cover 3 with the cover claw portion 306 disposed in the housing portion 203 and movement of the rear cover 3 in the front-back direction being restricted. It is hooked onto the engaging portion 312 that is attached. The arm portion 202A of the hook member 202 is elastically deformed so that the hook portion 202D moves in the radial direction. When the rear cover 3 rotates, the arm portion 202A is elastically deformed, so that the hook portion 202D can move in the radial direction along the upper surface of the central lower plate portion 309. The rib portion 311 contacts the tip of the hook member 202 with the hook portion 202D hooked onto the engaging portion 312. By hooking the hook portion 202D to the engaging portion 312, movement of the rear cover 3 toward the other side in the circumferential direction is restricted. When the tip of the hook member 202 contacts the rib portion 311, movement of the rear cover 3 to one side in the circumferential direction is restricted.

With the hook portion 202D hooked onto the engaging portion 312, the elastic member 204 contacts each of the cover cylinder portion 302, the central lower plate portion 309, and the rib portion 311 in a compressed state. That is, the elastic member 204 fits between the cover cylinder section 302, the central lower plate section 309, and the rib section 311. The elastic member 204 suppresses rattling of the rear cover 3. Further, by pressing the elastic member 204 against the hook member 202, unintentional elastic deformation of the arm portion 202A is suppressed. That is, by pressing the elastic member 204 against the hook member 202, unintentional movement of the hook portion 202D in the radial direction is suppressed. Therefore, the hook portion 202D is prevented from coming off the engagement portion 312.

As described above, in the embodiment, by simply screwing the rear cover 3 into the rear part of the motor housing part 21, the movement of the rear cover 3 in the front and rear direction with respect to the motor housing part 21 is restricted, and the movement of the rear cover 3 with respect to the motor housing part 21 is restricted. Movement to one side in the circumferential direction is restricted. The rear cover 3 is fixed to the rear part of the motor accommodating part 21. After the left motor housing part and the right motor housing part are fixed with the screws 2S, the rear cover 3 is fixed to the left motor housing part and the right motor housing part only by engaging with the rear part of the left motor housing part and the right motor housing part. be done.

With the rear cover 3 fixed to the rear part of the motor accommodating portion 21, the outer circumferential surface of the housing cylindrical portion 200 and the inner circumferential surface of the cover cylindrical portion 302 face each other. The outer circumferential surface of the housing cylindrical portion 200 and the inner circumferential surface of the cover cylindrical portion 302 may be in contact with each other or may be separated from each other. With the rear cover 3 fixed to the rear part of the motor accommodating portion 21, the cover claw portion 306 contacts the housing claw portion 201. The cover cylinder part 302 is arranged around the housing cylinder part 200 with the rear cover 3 fixed to the rear part of the motor accommodating part 21 . With the rear cover 3 fixed to the rear part of the motor accommodating part 21, the hook member 202 is arranged radially outward of the cover cylinder part 302. With the rear cover 3 fixed to the rear part of the motor accommodating part 21, the central lower plate part 309 is arranged radially outward from the hook member 202. With the rear cover 3 fixed to the rear part of the motor accommodating part 21, the elastic member 204 is arranged between the cover cylinder part 302 and the central lower plate part 309.

FIG. 25 is a sectional view for explaining a method for releasing fixation of the rear cover 3 according to the embodiment. When removing the rear cover 3 from the motor housing portion 21, the jig 80 is inserted into the hole 313 from the lower side of the hole 313. The jig 80 is a rod-shaped member that can be inserted into the hole 313. The jig 80 inserted into the hole 313 moves the arm portion 202A upward so that the hook portion 202D is removed from the engagement portion 312. Since the arm portion 202A is elastically deformable, it can be moved upward by the jig 80. By moving the arm portion 202A upward, the hook portion 202D is removed from the engagement portion 312. With the hook portion 202D disengaged from the engaging portion 312, the rear cover 3 is rotated to the other side in the circumferential direction, thereby detaching the rear cover 3 from the motor housing portion 21.

[Operation of impact tool]
Next, the operation of the power tool 1 will be explained. For example, when performing a screw tightening operation on a work object, a tip tool (driver bit) used for the screw tightening operation is inserted into the tool hole 10C of the anvil 10. The tip tool inserted into the tool hole 10C is held by the tool holding mechanism 11. After the tip tool is attached to the anvil 10, the operator grasps the grip portion 22 with, for example, the right hand and pulls the trigger lever 14 with the index finger of the right hand. When the trigger lever 14 is pulled, power is supplied from the battery pack 25 to the motor 6, the motor 6 is started, and the light assembly 18 is turned on at the same time. By starting the motor 6, the rotor shaft 33 of the rotor 27 rotates. When the rotor shaft 33 rotates, the rotational force of the rotor shaft 33 is transmitted to the planetary gear 42 via the pinion gear 41. The planetary gear 42 is meshed with the internal teeth of the internal gear 43 and revolves around the pinion gear 41 while rotating. The planetary gear 42 is rotatably supported by the spindle 8 via a pin 42P. Due to the revolution of the planetary gear 42, the spindle 8 rotates at a rotation speed lower than the rotation speed of the rotor shaft 33.

When the spindle 8 rotates while the hammer protrusion 47D and the anvil protrusion 10B are in contact with each other, the anvil 10 rotates together with the hammer 47 and the spindle 8. As the anvil 10 rotates, the screw tightening work progresses.

When a load of a predetermined value or more is applied to the anvil 10 as the screw tightening work progresses, the anvil 10 and the hammer 47 stop rotating. When the spindle 8 rotates while the rotation of the hammer 47 is stopped, the hammer 47 moves rearward. By moving the hammer 47 backward, the contact between the hammer protrusion 47D and the anvil protrusion 10B is released. The hammer 47, which has moved backward, moves forward while rotating due to the elastic force of the coil spring 49. As the hammer 47 moves forward while rotating, the anvil 10 is struck by the hammer 47 in the rotational direction. Thereby, the anvil 10 rotates around the rotation axis AX with high torque. Therefore, the screw is tightened to the workpiece with a high torque.

[effect]
As described above, in the embodiment, the power tool 1 includes a motor 6 having a rotor 27 and a stator 26 that rotate around a rotation axis AX extending in the front-rear direction, and a rotor 27 disposed on the front side of the motor 6. an anvil 10 that is an output section that rotates based on the rotational force of the motor, a motor housing section 21 that houses the motor 6, a grip section 22 that extends downward from the motor housing section 21, and a rear rotor that supports the rear part of the rotor 27. It includes a bearing 37 and a rear cover 3 that is arranged to cover the opening at the rear end of the motor accommodating part 21 and holds the rear rotor bearing 37. The motor accommodating part 21 includes a guide part that guides the rear cover 3 to one side in the circumferential direction and to the front side, a front-rear restriction part that restricts the movement of the rear cover 3 in the front-rear direction guided by the guide part, and a front-rear direction restriction part that restricts the movement of the rear cover 3 in the front-rear direction. It has a circumferential direction regulating part that regulates the circumferential movement of the rear cover 3.

In the above configuration, by simply rotating the rear cover 3 relative to the rear part of the motor accommodating part 21 without using screws, the movement of the rear cover 3 in the longitudinal direction and in the circumferential direction with respect to the motor accommodating part 21 is restricted. . That is, the rear cover 3 is fixed to the rear part of the motor housing part 21 simply by rotating the rear cover 3 with respect to the rear part of the motor housing part 21 without using screws. Since screws are not required, there is no need to provide a boss portion on the rear cover 3 and the motor accommodating portion 21. Therefore, increasing the size of the power tool 1 is suppressed. In particular, enlargement of the rear cover 3 and the motor accommodating portion 21 in the left-right direction is suppressed. Since the power tool 1 is prevented from increasing in size, the workability of the power tool 1 is prevented from decreasing even in a narrow space, for example, near a wall. Further, since screws are not required, deterioration in the ease of assembling the power tool 1 is suppressed.

In the embodiment, the motor accommodating portion 21 includes a support surface 211 that is arranged to surround the rotation axis AX and faces rearward, a housing cylinder part 200 that projects rearward from the support surface 211 and defines an opening, and a housing cylinder. A housing claw portion 201 protrudes radially outward from the outer peripheral surface of the portion 200. The guide portion is provided on the housing claw portion 201.

In the above configuration, the rear cover 3 is guided by the housing claw portion 201.

In the embodiment, the housing claw portion 201 has an inclined surface 201A that is inclined forward toward one side in the circumferential direction. The guide portion includes an inclined surface 201A.

In the above configuration, the rear cover 3 is guided to one side in the circumferential direction and to the front side by the inclined surface 201A of the housing claw portion 201.

In the embodiment, at least a portion of the longitudinal direction regulating portion is provided in the housing claw portion 201.

In the above configuration, the housing claw portion 201 restricts the movement of the rear cover 3 in the front-rear direction.

In the embodiment, the housing claw portion 201 has a front surface 201B facing forward. The longitudinal direction regulating portion includes a front surface 201B. The front surface 201B restricts movement of the rear cover 3 to the rear side.

In the above configuration, the rear cover 3 is restricted from moving rearward by the front surface 201B of the housing claw portion 201.

In embodiments, the support surface 211 is arranged around the housing barrel 200. Front surface 201B faces support surface 211 with a gap therebetween. The longitudinal direction regulating portion includes a support surface 211 . The support surface 211 restricts forward movement of the rear cover 3.

In the above configuration, the support surface 211 restricts forward movement of the rear cover 3.

In the embodiment, the rear cover 3 has a cover claw part 306 that contacts the housing claw part 201. The cover claw portion 306 is arranged between the front surface 201B and the support surface 211 after being guided by the inclined surface 201A.

In the above configuration, by rotating the rear cover 3 only once at a predetermined angle, the rear cover 3 is guided to one side in the circumferential direction and to the front side, and then the movement of the rear cover 3 in the front-back direction is restricted.

In the embodiment, the rear cover 3 has a cover cylinder part 302 arranged around the housing cylinder part 200. The cover claw portion 306 is provided on the inner circumferential surface of the cover cylinder portion 302.

In the above configuration, by rotating the rear cover 3 around the housing cylindrical portion 200, the housing claw portion 201 and the cover claw portion 306 can be engaged with each other.

In the embodiment, a plurality of housing claw portions 201 and a plurality of cover claw portions 306 are provided at intervals in the circumferential direction.

With the above configuration, the guide of the rear cover 3 is stabilized, and the movement of the rear cover 3 in the front-rear direction is stably restricted.

In the embodiment, the rear cover 3 has a cover claw portion 306 that is guided by a guide portion.

In the above configuration, the rear cover 3 is guided by the guide portion via the cover claw portion 306.

In the embodiment, the longitudinal direction regulating section regulates movement of the cover claw section 306 in the longitudinal direction.

In the above configuration, the movement of the rear cover 3 in the front-rear direction is restricted via the cover claw portion 306.

In the embodiment, the circumferential restriction portion is arranged at a different position from the front-rear restriction portion.

With the above configuration, complication of the structure of each of the longitudinal direction regulating part and the circumferential direction regulating part is suppressed.

In the embodiment, the circumferential restriction portion includes a hook member 202 having a hook portion 202D that is hooked onto an engaging portion 312 provided on the rear cover 3.

In the above configuration, the hook portion 202D is hooked onto the engaging portion 312, thereby restricting movement of the rear cover 3 in the circumferential direction.

In the embodiment, the hook member 202 includes an arm portion 202A having a base end portion 202B fixed to the motor accommodating portion 21 and a distal end portion 202C on which a hook portion 202D is provided.

In the above configuration, the hook portion 202D is smoothly hooked onto the engaging portion 312.

In the embodiment, the arm portion 202A is elastically deformed so that the hook portion 202D moves in the radial direction.

In the above configuration, the hook portion 202D is smoothly hooked onto the engaging portion 312.

In the embodiment, the rear cover 3 has a cover cylinder part 302 arranged around the housing cylinder part 200. The circumferential regulating portion is arranged radially outward from the cover cylinder portion 302.

In the above configuration, the outer circumferential surface of the housing cylindrical portion 200 and the inner circumferential surface of the cover cylindrical portion 302 can face each other, so that the rear cover 3 can smoothly rotate until its rotation in the circumferential direction is regulated by the circumferential direction regulating portion. can be rotated.

In the embodiment, the rear cover 3 has a rib portion 311 that protrudes radially outward from the outer peripheral surface of the cover cylinder portion 302. The rib portion 311 contacts the tip of the hook member 202 with the hook portion 202D hooked onto the engaging portion 312.

In the above configuration, the movement of the rear cover 3 in the circumferential direction is restricted by the contact between the tip of the hook member 202 and the rib portion 311.

In the embodiment, the hook portion 202D may restrict movement of the rear cover 3 to the other side in the circumferential direction, and the tip portion of the hook member 202 may restrict movement of the rear cover 3 to one side in the circumferential direction.

With the above configuration, movement of the rear cover 3 in the circumferential direction is appropriately regulated.

In the embodiment, the rear cover 3 has a central lower plate portion 309 that is disposed radially outward from the hook member 202 . A hole 313 is provided in the central lower plate portion 309 .

In the above configuration, the hook member 202 can be accessed through the hole 313. For example, when releasing the fixation of the rear cover 3, the jig 80 can be inserted into the hole 313 to move the hook member 202.

In the embodiment, the power tool 1 includes an elastic member 204 supported by the motor accommodating portion 21 and disposed between the cover cylinder portion 302 and the central lower plate portion 309.

In the above configuration, the elastic member 204 suppresses rattling of the rear cover 3.

In the embodiment, the power tool 1 includes a motor 6 having a rotor 27 and a stator 26 that rotate around a rotation axis AX extending in the front-rear direction, and is arranged on the front side of the motor 6, and based on the rotational force of the rotor 27. Anvil 10 which is a rotating output part, a left motor housing part and a right motor housing part that house the motor 6, a grip part 22 extending downward from each of the left motor housing part and the right motor housing part, and the rear part of the rotor 27. After fixing the rear rotor bearing 37 supporting the left motor housing part and the right motor housing part, the left motor housing part and the right motor housing part are connected only by engagement with the rear part of the left motor housing part and the right motor housing part. The rear cover 3 is fixed to the rear rotor bearing 37 and holds the rear rotor bearing 37.

In the above configuration, the rear cover 3 is fixed to the motor housing part 21 simply by engaging the rear cover 3 with the rear part of the motor housing part 21 without using screws. Since screws are not required, there is no need to provide a boss portion on the rear cover 3 and the motor accommodating portion 21. Therefore, increasing the size of the power tool 1 is suppressed. Further, since screws are not required, deterioration in the ease of assembling the power tool 1 is suppressed.

In the embodiment, the left motor accommodating part and the right motor accommodating part are fixed by a plurality of screws 2S, and the plurality of screws 2S are arranged ahead of the rotor core 32 of the rotor 27.

In the above configuration, the rear cover 3 is fixed to the motor housing part 21 simply by engaging the rear cover 3 with the rear part of the motor housing part 21 without using screws. Therefore, increasing the size of the power tool 1 is suppressed. In addition, deterioration in the ease of assembling the power tool 1 is suppressed.

In the embodiment, the rear cover 3 is arranged on the left and right sides of the left motor housing part and the right motor housing part, thereby preventing separation of the rear part of the left motor housing part and the rear part of the right motor housing part.

In the above configuration, the rear cover 3 prevents the left motor accommodating portion and the right motor accommodating portion from being separated.

In the embodiment, exhaust ports 20 extending vertically are arranged on each of the left side and right side of the rear cover 3.

In the above configuration, the air that has cooled the motor 6 is exhausted from the exhaust port 20.

[2] Second Embodiment The second embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 26 is a perspective view of the upper part of the power tool 1 according to the embodiment from the rear side. In the embodiment described above, the circumferential direction regulating portion includes the hook member 202. The circumferential restriction portion may include a screw.

The rear cover 3B shown in FIG. 26 includes a cover plate portion 301, a cover tube portion 302, and a convex portion 320 projecting downward from the cover tube portion 302. Further, a fixing portion 220 is fixed to the rear portion of the left housing 2L. The fixing part 220 projects rearward from the rear part of the grip part 22 of the left housing 2L. The convex portion 320 and the fixing portion 220 are fixed by screws 330. The screw 330 is inserted into an opening provided in the protrusion 320 from the right side of the protrusion 320, and then inserted into a screw hole provided in the fixing portion 220. By fixing the convex portion 320 of the rear cover 3B and the fixing portion 220 fixed to the grip portion 22 with the screws 330, movement of the rear cover 3B in the circumferential direction with respect to the motor housing portion 21 is restricted.

[3] Third Embodiment A third embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 27 is a perspective view of the upper part of the power tool 1 according to the embodiment from the rear side. The rear cover 3C shown in FIG. 27 includes a cover plate portion 301, a cover tube portion 302, and a convex portion 340 projecting downward from the cover tube portion 302. The convex portion 340 and the grip portion 22 are fixed with a screw 350. The screw 350 is inserted into an opening provided in the protrusion 340 from the rear side of the protrusion 340, and then inserted into a screw hole provided in the grip portion 22. By fixing the convex portion 340 of the rear cover 3C and the grip portion 22 with the screws 350, movement of the rear cover 3C in the circumferential direction with respect to the motor housing portion 21 is restricted.

[4] Fourth Embodiment The fourth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 28 is a diagram schematically showing the power tool 1 according to the embodiment. Similar to the first embodiment described above, the rear cover 3 is arranged to cover the opening at the rear end of the motor housing section 21. The rear cover 3 is fixed to the rear part of the motor accommodating part 21 without using screws. The rear cover 3 holds the rear rotor bearing 37. The rear cover 3 is removable from the motor accommodating portion 21 . The rear cover 3 is fixed to the motor accommodating portion 21 only by engagement. The rear cover 3 is made of synthetic resin.

The rear cover 3 can be replaced with a rear cover 3D having a different color from the rear cover 3. Like the rear cover 3, the rear cover 3D also includes a cover plate portion 301 and a cover cylinder portion 302 that protrudes forward from the peripheral edge of the cover plate portion 301 and is disposed around the rear portion of the motor housing portion 21. The rear cover 3D is fixed to the rear part of the motor accommodating part 21 without using screws. The rear cover 3D holds the rear rotor bearing 37. The rear cover 3D is removable from the motor accommodating portion 21. The rear cover 3D is fixed to the motor accommodating portion 21 only by engagement.

The rear cover 3D includes a rear cover 3D1 of a first color, a rear cover 3D2 of a second color different from the first color, and a rear cover 3D3 of a third color different from the first color and the second color. Since the rear cover 3 and the rear cover 3D are replaceable, the user of the power tool 1 can customize the power tool 1 as necessary. By replacing the rear cover 3 with the rear cover 3D, the user of the power tool 1 can identify the power tool 1 by color.

[5] Fifth Embodiment The fifth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 29 is a perspective view from the rear side showing the power tool 1 according to the embodiment. FIG. 30 is a diagram of the rear cover 3E according to the embodiment viewed from the rear side. As shown in FIGS. 29 and 30, the rear cover 3 described in the first embodiment above can be replaced with a rear cover 3E having a luminescent material portion 100. The rear cover 3E has a different shape from the rear cover 3 due to the luminescent material portion 100. The luminescent material portion 100 has a different composition and color from the rear cover 3. Composition is a concept that includes materials.

Like the rear cover 3, the rear cover 3E also includes a cover plate portion 301 and a cover cylinder portion 302 that protrudes forward from the peripheral edge of the cover plate portion 301 and is disposed around the rear portion of the motor housing portion 21. The rear cover 3E holds the rear rotor bearing 37. The rear cover 3E is removable from the motor accommodating portion 21. The rear cover 3E is fixed to the motor accommodating portion 21 only by engagement.

The luminescent material section 100 is provided in an annular shape on the rear surface of the cover plate section 301.

Since the rear cover 3 and the rear cover 3E are replaceable, the user of the power tool 1 can customize the power tool 1 as necessary. By replacing the rear cover 3 with the rear cover 3E, the user of the power tool 1 can identify the power tool 1. The luminescent material portion 100 allows the user of the power tool 1 to identify the power tool 1 even at night, for example.

Note that the rear cover 3E may have the same shape as the rear cover 3. At least a portion of the rear cover 3E may be formed of a luminescent material.

[6] Sixth Embodiment The sixth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 31 is a side view showing the power tool 1 according to the embodiment. As shown in FIG. 31, the rear cover 3 described in the first embodiment above can be replaced with a rear cover 3F having a hook portion 101. Due to the hook portion 101, the rear cover 3F has a different shape from the rear cover 3. The hook portion 101 has a different composition and color from the rear cover 3.

Like the rear cover 3, the rear cover 3F also includes a cover plate portion 301 and a cover cylinder portion 302 that protrudes forward from the peripheral edge of the cover plate portion 301 and is disposed around the rear portion of the motor housing portion 21. The rear cover 3F holds the rear rotor bearing 37. The rear cover 3F is removable from the motor accommodating portion 21. The rear cover 3F is fixed to the motor accommodating portion 21 only by engagement. The hook portion 101 is fixed to the rear surface of the cover plate portion 301.

As shown in FIG. 31, the socket 102 may be attached to the anvil 10. A hexagonal hole is provided at the front end of the socket 102. An insertion portion inserted into the tool hole 10C of the anvil 10 is provided at the rear of the socket 102. With the head of the bolt placed in the hexagonal hole of the socket 102, the anvil 10 is rotated to tighten the bolt symmetrically.

The socket 102 is connected to the hook portion 101 via a connecting member 103. The connecting member 103 is wire-shaped. The connecting member 103 may include a string, a chain, or a flexible tube. One end of the connecting member 103 is attached to the front of the socket 102 . The other end of the connecting member 103 is attached to the hook portion 101 . Since the front part of the socket 102 is held by the hook part 101 via the connecting member 103, even if the middle part of the socket 102 breaks, the front part of the socket 102 is prevented from falling.

Note that the power tool 1 may be connected to a worker via a connecting member 104 connected to the hook portion 101.

Since the rear cover 3 and the rear cover 3F are replaceable, the user of the power tool 1 can customize the power tool 1 as necessary.

[7] Seventh Embodiment The seventh embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 32 is a perspective view from the rear side showing the power tool 1 according to the embodiment. FIG. 33 is a side view showing the upper part of the power tool 1 according to the embodiment. FIG. 34 is a perspective view from the rear side showing the power tool 1 according to the embodiment.

As shown in FIGS. 32, 33, and 34, the rear cover 3 described in the first embodiment above can be replaced with a rear cover 3G having a tool holder 105. The shape of the rear cover 3G is different from that of the rear cover 3 due to the tool holder 105. The tool holder 105 has a different composition and color from the rear cover 3.

Like the rear cover 3, the rear cover 3G also includes a cover plate portion 301 and a cover cylinder portion 302 that protrudes forward from the peripheral edge of the cover plate portion 301 and is disposed around the rear portion of the motor housing portion 21. The rear cover 3G holds the rear rotor bearing 37. The rear cover 3G is removable from the motor accommodating portion 21. The rear cover 3G is fixed to the motor accommodating portion 21 only by engagement. The tool holder 105 is fixed to the rear surface of the cover plate section 301.

Tool holder 105 has a plurality of holding grooves 107 for holding tools 106. The holding groove 107 is formed to extend in the left-right direction.

Since the rear cover 3 and the rear cover 3F are replaceable, the user of the power tool 1 can customize the power tool 1 as necessary. By holding a plurality of types of tools 106 in the tool holder 105, the user of the power tool 1 can efficiently exchange the tools 106 to be used depending on the content of the work.

[8] Eighth Embodiment The eighth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 35 is a perspective view from the rear side showing the power tool 1 according to the embodiment. FIG. 36 is a perspective view from the rear side showing the power tool 1 according to the embodiment.

The eighth embodiment is a modification of the seventh embodiment described above. As shown in FIGS. 35 and 36, the rear cover 3 described in the first embodiment above can be replaced with a rear cover 3H having a tool holder 105. Tool holder 105 has a plurality of holding grooves 107 for holding tools 106. The holding groove 107 is formed to extend in the vertical direction.

[9] Ninth Embodiment A ninth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 37 is a perspective view from the rear side showing the power tool 1 according to the embodiment. FIG. 38 is a perspective view from the rear side showing the power tool 1 according to the embodiment.

The ninth embodiment is a modification of the seventh and eighth embodiments described above. As shown in FIGS. 37 and 38, the rear cover 3 described in the first embodiment above can be replaced with a rear cover 3I having a tool holder 105. Tool holder 105 has a plurality of holding grooves 107 for holding tools 106. The holding groove 107 is formed to extend in an inclined direction that is inclined in the left-right direction and the up-down direction.

[10] Tenth Embodiment The tenth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 39 is a perspective view from the rear side showing the power tool 1 according to the embodiment. FIG. 40 is a side view showing the upper part of the power tool 1 according to the embodiment.

The tenth embodiment is a modification of the seventh, eighth, and ninth embodiments described above. As shown in FIGS. 39 and 40, the rear cover 3 described in the first embodiment above can be replaced with a rear cover 3J having a tool holder 105. Tool holder 105 has a plurality of holding grooves 107 for holding tools 106. Tool holder 105 is connected to cover plate section 301 via rotation mechanism 108. The tool holder 105 is rotatably supported by the cover plate section 301. Tool holder 105 is rotatable around rotation axis AX. By rotating the tool holder 105, the direction in which the holding groove 107 extends can be arbitrarily determined.

[11] Eleventh Embodiment The eleventh embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 41 is a perspective view from the rear side showing the power tool 1 according to the embodiment. FIG. 42 is a side view showing the upper part of the power tool 1 according to the embodiment.

The eleventh embodiment is a modification of the seventh embodiment described above. As shown in FIGS. 41 and 42, the rear cover 3 described in the first embodiment above can be replaced with a rear cover 3K having a tool holder 109. Tool holder 109 has a plurality of holding holes 110 for holding tools 106. The holding hole 110 is formed to extend in the left-right direction.

Note that the holding hole 110 may be formed to extend in the vertical direction. The holding hole 110 may be formed to extend in an inclined direction that is inclined in the left-right direction and the up-down direction. The tool holder 109 may be rotatably supported by the cover plate portion 301.

[12] Twelfth Embodiment The twelfth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 43 is a perspective view from the rear side showing the power tool 1 according to the embodiment. As shown in FIG. 43, the rear cover 3 described in the first embodiment above can be replaced with a rear cover 3L having a plate 111. Due to the plate 111, the rear cover 3L has a different shape from the rear cover 3. The plate 111 has a different composition and color from the rear cover 3.

Like the rear cover 3, the rear cover 3L also includes a cover plate portion 301 and a cover cylinder portion 302 that protrudes forward from the peripheral edge of the cover plate portion 301 and is disposed around the rear portion of the motor housing portion 21. The rear cover 3L holds the rear rotor bearing 37. The rear cover 3L is removable from the motor accommodating portion 21. The rear cover 3L is fixed to the motor accommodating portion 21 only by engagement. Plate 111 is fixed to the rear surface of cover plate section 301.

The front surface (rear surface) of the plate 111 is a flat surface. The user of the power tool 1 may attach a sticky note or a label to the plate 111. The surface of plate 111 is water repellent. The contact angle of the surface of the plate 111 with water may be 90 degrees or more, 100 degrees or more, or 110 degrees or more. Plate 111 may be a whiteboard.

Since the rear cover 3 and the rear cover 3L are replaceable, the user of the power tool 1 can customize the power tool 1 as necessary. If the plate 111 is a whiteboard, the user of the power tool 1 can write the work procedure on the whiteboard.

[13] Thirteenth Embodiment The thirteenth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 44 is a perspective view from the rear side showing the power tool 1 according to the embodiment. As shown in FIG. 44, the rear cover 3 described in the first embodiment above can be replaced with a rear cover 3M having a communication device 112. Due to the communication device 112, the rear cover 3M has a different shape from the rear cover 3. The communication device 112 has a different composition and color from the rear cover 3.

The communication device 112 includes a GNSS receiver and a transmitter that transmits a detection signal of the GNSS receiver. The GNSS receiver detects the position of the power tool 1 using the Global Navigation Satellite System (GNSS). Global navigation satellite systems include Global Positioning System (GPS). The transmitter transmits the position of the power tool 1 detected by the GNSS receiver. If the power tool 1 is used in an industrial facility, the transmitter may transmit the location of the power tool 1 to the industrial facility's management computer. The transmitter may transmit the position of the power tool 1 to a mobile terminal owned by the user of the power tool 1 via the server.

Since the rear cover 3 and the rear cover 3M are replaceable, the user of the power tool 1 can customize the power tool 1 as necessary. The position of the power tool 1 is managed because the communication device 112 includes a GNSS receiver.

Note that the communication device 112 does not need to include a GNSS receiver. The communication device 112 may transmit identification data of the power tool 1 to a management computer or a mobile terminal, for example. The communication device 112 may include RFID (Radio Frequency Identification).

[14] Fourteenth Embodiment The fourteenth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 45 is a perspective view from the front side showing the power tool 1 according to the embodiment. FIG. 46 is a perspective view from the rear side showing the power tool 1 according to the embodiment. FIG. 47 is a side view showing the upper part of the power tool 1 according to the embodiment. FIG. 48 is a diagram of the upper part of the power tool 1 according to the embodiment viewed from the front side. FIG. 49 is a cross-sectional view showing the upper part of the power tool 1 according to the embodiment. FIG. 49 corresponds to a cross-sectional view taken along the line CC in FIG. 47.

As shown in FIGS. 45, 46, 47, 48, and 49, the rear cover 3 described in the first embodiment above can be replaced with a rear cover 3N having a guide portion 314. The rear cover 3N has a different shape from the rear cover 3 due to the guide portion 314. The guide portion 314 may have a different composition from that of the rear cover 3, or may have the same composition. The guide portion 314 may be different in color from the rear cover 3, or may be the same color.

The rear cover 3N includes a cover plate portion 301, a cover cylinder portion 302, and a guide portion 314. The cover plate portion 301 has a disk shape. A convex portion 304 for holding the rear rotor bearing 37 is provided on the front surface of the cover plate portion 301. The cover cylinder portion 302 protrudes forward from the peripheral edge of the cover plate portion 301. The cover cylinder portion 302 is arranged around the rear portion of the motor housing portion 21 . The rear cover 3N is removable from the motor accommodating portion 21. The rear cover 3N is fixed to the motor accommodating portion 21 only by engagement.

The cover cylinder portion 302 has an exhaust port 20. The exhaust ports 20 are provided on the left and right sides of the cover cylinder section 302, respectively.

The guide portion 314 guides the air discharged from the exhaust port 20 to the front end portion of the anvil 10, which is the output portion of the power tool 1.

The guide portion 314 projects forward from the peripheral edge of the cover plate portion 301. The guide portion 314 is arranged radially outward from the cover cylinder portion 302. The front end portion of the guide portion 314 is arranged further forward than the front end portion of the cover cylinder portion 302. In the embodiment, the front end portion of the guide portion 314 is arranged on the radially outer side of the hammer case 4. In the front-rear direction, the position of the front end of the guide portion 314 and the position of at least a portion of the hammer case 4 match.

A plurality of guide portions 314 are provided at intervals in the circumferential direction. The guide portion 314 is arranged on the left side, right side, and upper side of the motor housing portion 21, respectively. A recess 315 is provided between adjacent guide parts 314. The intake port 19 is arranged in the recess 315. The guide portion 314 is arranged so as not to cover the intake port 19.

As shown in FIG. 48, the guide portion 314 includes a circular arc portion 314A, a first wall portion 314B provided on one side of the circular arc portion 314A in the circumferential direction, and a second wall portion 314B provided on the other side of the circular arc portion 314A in the circumferential direction. It has a wall portion 314C. The arc portion 314A is provided along a virtual circle centered on the rotation axis AX. The first wall portion 314B is provided so as to extend radially inward from one end portion of the circular arc portion 314A in the circumferential direction. The second wall portion 314C is provided so as to extend inward in the radial direction from the other end portion of the circular arc portion 314A in the circumferential direction. A flow path 316 is formed between the guide portion 314 and the motor housing portion 21 .

When the fan 12 is rotated by the drive of the motor 6, air flows into the motor accommodating part 21 from the intake port 19, and the air inside the motor accommodating part 21 is discharged from the exhaust port 20. Air discharged from the exhaust port 20 flows toward the front end of the anvil 10 by the guide portion 314.

For example, dust may be generated from the workpiece during screw tightening work. That is, there is a possibility that dust may be generated due to the rotation of the tip tool attached to the anvil 10. Dust is blown away by the air discharged from the exhaust port 20 and flowing toward the front end of the anvil 10 by the guide portion 314.

Since the rear cover 3 and the rear cover 3N are replaceable, the user of the power tool 1 can customize the power tool 1 as necessary. By replacing the rear cover 3 with the rear cover 3N, the power tool 1 can be provided with a blower function.

[15] Fifteenth Embodiment The fifteenth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 50 is a perspective view from the rear side showing the power tool 1 according to the embodiment. FIG. 51 is a diagram of the upper part of the power tool 1 according to the embodiment viewed from the rear side.

As shown in FIGS. 50 and 51, the rear cover 3 described in the first embodiment above can be replaced with a rear cover 3O having an analog counter 113. Due to the analog counter 113, the rear cover 3O has a different shape from the rear cover 3. The analog counter 113 has a different composition and color from the rear cover 3.

Like the rear cover 3, the rear cover 3O also includes a cover plate portion 301 and a cover cylinder portion 302 that protrudes forward from the peripheral edge of the cover plate portion 301 and is disposed around the rear portion of the motor housing portion 21. The rear cover 3O holds the rear rotor bearing 37. The rear cover 3O is removable from the motor accommodating portion 21. The rear cover 3O is fixed to the motor accommodating portion 21 only by engagement. Analog counter 113 is fixed to the rear surface of cover plate section 301.

The analog counter 113 has a count button 113A, a display section 113B, and a reset button 113C.

Since the rear cover 3 and the rear cover 3O are replaceable, the user of the power tool 1 can customize the power tool 1 as necessary. The analog counter 113 allows the user of the power tool 1 to count, for example, the number of screws that have been tightened. By pressing the count button 113A, the number of screws is counted and displayed on the display section 113B. By pressing the reset button 113C, the display on the display section 113B is reset.

[16] Sixteenth Embodiment The sixteenth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 52 is a cross-sectional view showing the upper part of the power tool 1 according to the embodiment. As shown in FIG. 52, the rear cover 3 described in the first embodiment above can be replaced with a rear cover 3P having an opening 317 in the center of the cover plate portion 301. Due to the opening 317, the rear cover 3P has a different shape from the rear cover 3.

Like the rear cover 3, the rear cover 3P also includes a cover plate portion 301 and a cover cylinder portion 302 that protrudes forward from the peripheral edge of the cover plate portion 301 and is disposed around the rear portion of the motor housing portion 21. The rear cover 3P holds the rear rotor bearing 37. The rear cover 3P is removable from the motor accommodating portion 21. The rear cover 3P is fixed to the motor accommodating portion 21 only by engagement.

Furthermore, the rotor 27 described in the first embodiment above can be replaced with a rotor 27P having a rotor shaft 33P that projects rearward beyond the rear cover 3P through the opening 317. The rotor shaft 33P of the rotor 27P is arranged in the opening 317.

Since the rear cover 3 and the rear cover 3P are replaceable, the user of the power tool 1 can customize the power tool 1 as necessary. Since the rear end of the rotor shaft 33P protrudes further rearward than the rear cover 3P, the rotational force of the rotor shaft 33P can be used as desired.

[17] Seventeenth Embodiment The seventeenth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 53 is a cross-sectional view showing the upper part of the power tool 1 according to the embodiment. As shown in FIG. 53, the rear cover 3 described in the above embodiment can be replaced with a rear cover 3Q having a dimension larger than that of the rear cover 3 in the radial direction. The outer diameter of the rear cover 3Q is larger than the outer diameter of the rear cover 3. The rear cover 3Q is different from the rear cover 3 in shape and dimensions.

Like the rear cover 3, the rear cover 3Q also includes a cover plate portion 301 and a cover cylinder portion 302 that protrudes forward from the peripheral edge of the cover plate portion 301 and is disposed around the rear portion of the motor housing portion 21. The rear cover 3Q holds the rear rotor bearing 37. The rear cover 3Q is removable from the motor accommodating portion 21. The rear cover 3Q is fixed to the motor accommodating portion 21 only by engagement.

Further, the fan 12 described in the first embodiment above can be replaced with a fan 12Q having a dimension larger than that of the fan 12 in the radial direction.

Since the rear cover 3 and the rear cover 3Q are replaceable, the user of the power tool 1 can customize the power tool 1 as necessary. If the user of the power tool 1 wishes to use a fan 12Q that is larger in size than the fan 12, the user of the power tool 1 can replace the rear cover 3 with a rear cover 3Q.

[18] Eighteenth Embodiment The eighteenth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 54 is a perspective view from the rear side showing the power tool 1 according to the embodiment. FIG. 55 is a diagram of the upper part of the power tool 1 according to the embodiment viewed from the rear side.

As shown in FIGS. 54 and 55, the rear cover 3 described in the first embodiment above can be replaced with a rear cover 3R having a level 114. The shape of the rear cover 3R is different from that of the rear cover 3 due to the level device 114. The level device 114 has a different composition and color from the rear cover 3. The level 114 is a round level.

Like the rear cover 3, the rear cover 3R also includes a cover plate portion 301 and a cover cylinder portion 302 that protrudes forward from the peripheral edge of the cover plate portion 301 and is disposed around the rear portion of the motor housing portion 21. The rear cover 3R holds the rear rotor bearing 37. The rear cover 3R is removable from the motor accommodating portion 21. The rear cover 3R is fixed to the motor accommodating portion 21 only by engagement. The level device 114 is fixed to the rear surface of the cover plate section 301.

The level 114 is a round level. The level 114 has a round bubble tube 114A and a marked line 114B. A bubble 114C exists inside the round bubble tube 114A. When the attitude of the power tool 1 is adjusted so that the rotation axis AX of the motor 6 is perpendicular to the horizontal plane, the air bubble 114C is arranged at the center of the marked line 114B.

Since the rear cover 3 and the rear cover 3R are replaceable, the user of the power tool 1 can customize the power tool 1 as necessary. For example, when tightening a screw perpendicularly to a horizontal surface, the user of the power tool 1 should tighten the screw while checking the posture of the power tool 1 so that the air bubble 114C is placed in the center of the marked line 114B. can be carried out. Furthermore, by checking the level 114, the user of the power tool 1 can perform screw tightening work with the tip tool perpendicular to the horizontal surface. By performing screw tightening work with the tip tool vertical, the occurrence of a phenomenon in which the tip tool comes off from the head of the screw (cam-out) is suppressed.

[19] Nineteenth Embodiment The eighteenth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 56 is a perspective view from the rear side showing the power tool 1 according to the embodiment. As shown in FIG. 56, the rear cover 3 described in the first embodiment above can be replaced with a rear cover 3S having a side handle 115. The rear cover 3S has a different shape from the rear cover 3 due to the side handle 115. The side handle 115 has a different composition and color from the rear cover 3.

Like the rear cover 3, the rear cover 3S also includes a cover plate portion 301 and a cover cylinder portion 302 that protrudes forward from the peripheral edge of the cover plate portion 301 and is disposed around the rear portion of the motor accommodating portion 21. The rear cover 3S holds the rear rotor bearing 37. The rear cover 3S is removable from the motor accommodating portion 21. The rear cover 3S is fixed to the motor accommodating portion 21 only by engagement. The side handle 115 protrudes from the left side of the cover cylinder portion 302 to the left side. Note that the side handle 115 may protrude from the right side of the cover cylinder portion 302 to the right side. The side handle 115 may protrude upward from the top of the cover cylinder portion 302.

Since the rear cover 3 and the rear cover 3S are replaceable, the user of the power tool 1 can customize the power tool 1 as necessary. For example, the user of the power tool 1 operates the trigger lever 14 while gripping the grip portion 22 with his right hand, and grips the side handle 115 with his left hand, thereby receiving a reaction force acting on the power tool 1 during screw tightening work. be able to.

[20] Twentieth Embodiment The twentieth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 57 is a diagram schematically showing the power tool 1 according to the embodiment. The rear cover 3 described in the first embodiment above is made of synthetic resin. As shown in FIG. 57, the rear cover 3 described in the first embodiment above can be replaced with a metal rear cover 3T. The rear cover 3T is made of iron, for example. The rear cover 3T has a different composition from the rear cover 3.

Like the rear cover 3, the rear cover 3T also includes a cover plate portion 301 and a cover cylinder portion 302 that protrudes forward from the peripheral edge of the cover plate portion 301 and is disposed around the rear portion of the motor housing portion 21. The rear cover 3T holds the rear rotor bearing 37. The rear cover 3T is removable from the motor accommodating portion 21. The rear cover 3T is fixed to the motor accommodating portion 21 only by engagement.

Since the rear cover 3 and the rear cover 3T are replaceable, the user of the power tool 1 can customize the power tool 1 as necessary. Since the rear cover 3T is made of hard metal, deformation of the rear cover 3T is suppressed even if the power tool 1 is dropped. Furthermore, since the rear cover 3T is made of hard metal, the user of the power tool 1 can strike the target with the rear cover 3T.

[21] Other Embodiments In the embodiments described above, the power tool 1 is an impact driver. The power tool 1 may be an impact wrench or a driver drill.

In the embodiment described above, the power source of the power tool 1 may not be the battery pack 25, but may be a commercial power source (AC power source).

1...Power tool, 2...Housing, 2L...Left housing, 2R...Right housing, 2S...Screw, 3...Rear cover, 3B...Rear cover, 3C...Rear cover, 3D...Rear cover, 3D1...Rear cover, 3D2...Rear cover, 3D3...Rear cover , 3E...Rear cover, 3F...Rear cover, 3G...Rear cover, 3H...Rear cover, 3I...Rear cover, 3J...Rear cover, 3K...Rear cover, 3L...Rear cover, 3M...Rear cover, 3N...Rear cover, 3O...Rear cover, 3P...Rear cover, 3Q ...Rear cover, 3R...Rear cover, 3S...Rear cover, 3T...Rear cover, 4...Hammer case, 4A...Large tube section, 4B...Small tube section, 4C...Connection section, 6...Motor, 7...Deceleration mechanism, 8...Spindle, 8A ...Spindle shaft part, 8B...First flange part, 8C...Second flange part, 8D...Connection part, 8F...Spindle convex part, 8G...Spindle groove, 9...Blow mechanism, 10...Anvil (output part), 10A... Anvil shaft part, 10B... Anvil protrusion, 10C... Tool hole, 10D... Anvil recess, 11... Tool holding mechanism, 12... Fan, 12A... Bush, 12Q... Fan, 13... Battery mounting part, 14... Trigger lever, 15 ...Forward/reverse switching lever, 16...Hand mode switching button, 16A...Circuit board, 16B...Switch, 18...Light assembly, 18A...Circuit board, 18B...Light emitting element, 18C...Optical member, 19...Intake port, 20...Exhaust Mouth, 21...Motor accommodating part, 22...Grip part, 23...Battery holding part, 24...Bearing box, 24A...Rear side annular part, 24B...Front side annular part, 24C...Connection part, 25...Battery pack, 26...Stator , 27... Rotor, 27P... Rotor, 28... Stator core, 29... Rear insulator, 30... Front insulator, 30S... Screw, 31... Coil, 32... Rotor core, 33... Rotor shaft, 33P... Rotor shaft, 34A... Rotor magnet , 34B...sensor magnet, 35...sensor board, 36...fusing terminal, 37...rear rotor bearing, 38...front rotor bearing, 41...pinion gear, 42...planetary gear, 42P...pin, 43...internal gear, 44... Spindle bearing, 45... O ring, 46... Anvil bearing, 47... Hammer, 47A... Body part, 47B... Outer cylinder part, 47C... Inner cylinder part, 47D... Hammer protrusion, 47E... Recess, 47G... Hammer groove, 48 ...Ball, 49...Coil spring, 50...Washer, 51...Hammer case cover, 52...Light cover, 54...Ball, 56...Washer, 57...Support member, 71...Ball, 72...Leaf spring, 73...Sleeve, 74 Coil spring, 75 Positioning member, 76 Support recess, 80 Jig, 100 Luminous material part, 101 Hook part, 102 Socket, 103 Connecting member, 104 Connecting member, 105 Tool holder, 106 ...Tool, 107...Holding groove, 108...Rotating mechanism, 109...Tool holder, 110...Holding hole, 111...Plate, 112...Communication device, 113...Analog counter, 113A...Count button, 113B...Display section, 113C...Reset Button, 114...Level, 114A...Round bubble tube, 114B...Marked line, 114C...Bubble, 115...Side handle, 200...Housing cylinder part, 201...Housing claw part, 201A...Slanted surface, 201B...Front surface, 201L ...Housing claw part, 201R...Housing claw part, 202...Hook member, 202A...Arm part, 202B...Base end part, 202C...Tip part, 202D...Hook part, 203...Accommodation part, 203L...Accommodation part, 203R...Accommodation 204...Elastic member, 210...Cylindrical part, 211...Supporting surface, 220...Fixing part, 301...Cover plate part, 302...Cover cylinder part, 303...Pillar part, 304...Convex part, 305...Accommodating part, 306 ...Cover claw part, 306L...Cover claw part, 306R...Cover claw part, 307... Center back plate part, 308... Side back plate part, 308L... Side back plate part, 308R... Side back plate part, 309... Central lower plate part, 310... Lateral lower plate part, 310L... Lateral lower plate part, 310R... Lateral lower plate part, 311... Rib part, 312... Engaging part, 313... Hole part, 314... Guide part, 314A... Arc part, 314B... First wall part, 314C... Second wall part, 315... Recessed part, 316... Channel, 317... Opening part, 320... Convex part, 330... Screw, 340... Convex part, 350... Screw , AX...Rotation axis.

Claims (44)

a motor having a rotor and a stator that rotate around a rotating shaft extending in the front-rear direction;
an output section that is arranged on the front side of the motor and rotates based on the rotational force of the rotor;
a motor accommodating portion that accommodates the motor;
a grip portion extending downward from the motor housing portion;
a rear rotor bearing that supports the rear part of the rotor;
a rear cover disposed to cover an opening at a rear end of the motor accommodating portion and holding the rear rotor bearing;
The motor accommodating part is
a guide portion that guides the rear cover to one side in the circumferential direction and to the front side;
a front-rear direction regulating part that regulates the front-rear movement of the rear cover guided by the guide part;
a circumferential direction regulating portion that regulates movement in the circumferential direction of the rear cover whose movement in the front and back direction is regulated;
Electric tool. The motor accommodating part is
a support surface arranged to surround the rotation axis and facing rearward;
a housing cylindrical portion that protrudes rearward from the support surface and defines the opening;
a housing claw portion protruding radially outward from the outer peripheral surface of the housing cylinder portion;
The guide portion is provided on the housing claw portion,
The power tool according to claim 1. The housing claw portion has an inclined surface that slopes forward toward one side in the circumferential direction,
The guide portion includes the inclined surface.
The power tool according to claim 2. At least a part of the longitudinal direction regulating part is provided in the housing claw part,
The power tool according to claim 3. The housing claw portion has a front surface facing forward,
The front-rear direction regulating portion includes the front surface,
the front surface restricts rearward movement of the rear cover;
The power tool according to claim 4. The support surface is arranged around the housing cylinder portion,
the front surface faces the support surface with a gap therebetween;
The front-rear direction regulating portion includes the support surface,
The support surface restricts forward movement of the rear cover.
The power tool according to claim 5. The rear cover has a cover claw that contacts the housing claw,
The cover claw part is arranged between the front surface and the support surface after being guided by the inclined surface.
The power tool according to claim 6. The rear cover has a cover cylindrical portion disposed around the housing cylindrical portion,
The cover claw portion is provided on the inner peripheral surface of the cover cylinder portion,
The power tool according to claim 7. Each of the housing claw part and the cover claw part is provided in plurality at intervals in the circumferential direction.
The power tool according to claim 8. The rear cover has a cover claw portion that is guided by the guide portion.
The power tool according to any one of claims 1 to 6. The longitudinal direction regulating section regulates movement of the cover claw section in the longitudinal direction;
The power tool according to claim 10. The circumferential restriction portion is arranged at a different position from the front-back restriction portion,
The power tool according to claim 2. The circumferential direction regulating portion includes a hook member having a hook portion that is hooked onto an engaging portion provided on the rear cover.
The power tool according to claim 12. The hook member includes an arm portion having a base end portion fixed to the motor accommodating portion and a distal end portion where the hook portion is provided.
The power tool according to claim 13. The arm portion is elastically deformed so that the hook portion moves in a radial direction.
The power tool according to claim 14. The rear cover has a cover cylindrical portion disposed around the housing cylindrical portion,
The circumferential direction regulating part is arranged radially outward from the cover cylinder part.
The power tool according to claim 15. The rear cover has a rib portion that projects radially outward from the outer circumferential surface of the cover cylinder portion,
The rib portion contacts the distal end portion of the hook member when the hook portion is hooked to the engaging portion.
The power tool according to claim 16. The hook portion restricts movement of the rear cover to the other side in the circumferential direction,
The tip of the hook member restricts movement of the rear cover to one side in the circumferential direction;
The power tool according to claim 17. The rear cover has a lower plate portion disposed radially outward than the hook member,
a hole is provided in the lower plate part;
The power tool according to any one of claims 16 to 18. an elastic member supported by the motor accommodating portion and disposed between the cover cylinder portion and the lower plate portion;
The power tool according to claim 19. a motor having a rotor and a stator that rotate around a rotating shaft extending in the front-rear direction;
an output section that is arranged on the front side of the motor and rotates based on the rotational force of the rotor;
a left motor housing part and a right motor housing part that house the motor;
a grip portion extending downward from each of the left motor housing portion and the right motor housing portion;
a rear rotor bearing that supports the rear part of the rotor;
After the left motor accommodating part and the right motor accommodating part are fixed, the left motor accommodating part and the right motor accommodating part are fixed to each other only by engagement with the rear part of the left motor accommodating part and the right motor accommodating part. , a rear cover that holds the rear rotor bearing;
Electric tool. The left motor accommodating part and the right motor accommodating part are fixed with a plurality of screws,
The plurality of screws are arranged forward of the rotor core of the rotor,
The power tool according to claim 21. The rear cover is arranged on the left and right sides of the left motor accommodating part and the right motor accommodating part to prevent separation of the rear part of the left motor accommodating part and the rear part of the right motor accommodating part.
The power tool according to claim 21. Exhaust ports extending vertically are arranged on each of the left side and right side of the rear cover,
The power tool according to claim 21. a motor having a rotor and a stator that rotate around a rotating shaft extending in the front-rear direction;
an output section that is arranged on the front side of the motor and rotates based on the rotational force of the rotor;
a motor accommodating portion that accommodates the motor;
a rear rotor bearing that supports the rear part of the rotor;
a first rear cover disposed to cover an opening at a rear end of the motor accommodating portion and holding the rear rotor bearing;
The first rear cover is replaceable with a second rear cover having a different shape from the first rear cover.
Electric tool. Each of the first rear cover and the second rear cover includes a cover plate portion, and a cover cylinder portion that protrudes forward from a peripheral edge of the cover plate portion and is disposed around a rear portion of the motor housing portion,
The second rear cover has a luminescent material portion,
The power tool according to claim 25. Each of the first rear cover and the second rear cover includes a cover plate portion, and a cover cylinder portion that protrudes forward from a peripheral edge of the cover plate portion and is disposed around a rear portion of the motor housing portion,
The second rear cover has a hook portion.
The power tool according to claim 25. Each of the first rear cover and the second rear cover includes a cover plate portion, and a cover cylinder portion that protrudes forward from a peripheral edge of the cover plate portion and is disposed around a rear portion of the motor housing portion,
The second rear cover has a tool holder.
The power tool according to claim 25. The tool holder is rotatably supported by the cover plate part.
A power tool according to claim 28. Each of the first rear cover and the second rear cover includes a cover plate portion, and a cover cylinder portion that protrudes forward from a peripheral edge of the cover plate portion and is disposed around a rear portion of the motor housing portion,
The second rear cover has a plate.
The power tool according to claim 25. the plate is a whiteboard;
The power tool according to claim 30. Each of the first rear cover and the second rear cover includes a cover plate portion, and a cover cylinder portion that protrudes forward from a peripheral edge of the cover plate portion and is disposed around a rear portion of the motor housing portion,
the second rear cover has a communication device;
The power tool according to claim 25. Each of the first rear cover and the second rear cover includes a cover plate portion, and a cover cylinder portion that protrudes forward from a peripheral edge of the cover plate portion and is disposed around a rear portion of the motor housing portion,
The second rear cover has an exhaust port provided in the cover cylindrical portion, and a guide portion that guides air discharged from the exhaust port to the output portion.
The power tool according to claim 25. Each of the first rear cover and the second rear cover includes a cover plate portion, and a cover cylinder portion that protrudes forward from a peripheral edge of the cover plate portion and is disposed around a rear portion of the motor housing portion,
The second rear cover has an analog counter.
The power tool according to claim 25. Each of the first rear cover and the second rear cover includes a cover plate portion, and a cover cylinder portion that protrudes forward from a peripheral edge of the cover plate portion and is disposed around a rear portion of the motor housing portion,
The second rear cover is provided in the cover plate portion and has an opening in which a rotor shaft of the rotor is disposed.
The power tool according to claim 25. Each of the first rear cover and the second rear cover includes a cover plate portion, and a cover cylinder portion that protrudes forward from a peripheral edge of the cover plate portion and is disposed around a rear portion of the motor housing portion,
The outer diameter of the second rear cover is larger than the outer diameter of the first rear cover.
The power tool according to claim 25. Each of the first rear cover and the second rear cover includes a cover plate portion, and a cover cylinder portion that protrudes forward from a peripheral edge of the cover plate portion and is disposed around a rear portion of the motor housing portion,
the second rear cover has a level;
The power tool according to claim 25. Each of the first rear cover and the second rear cover includes a cover plate portion, and a cover cylinder portion that protrudes forward from a peripheral edge of the cover plate portion and is disposed around a rear portion of the motor housing portion,
The second rear cover has a side handle.
The power tool according to claim 25. a motor having a rotor and a stator that rotate around a rotating shaft extending in the front-rear direction;
an output section that is arranged on the front side of the motor and rotates based on the rotational force of the rotor;
a motor accommodating portion that accommodates the motor;
a rear rotor bearing that supports the rear part of the rotor;
a first rear cover disposed to cover an opening at a rear end of the motor accommodating portion and holding the rear rotor bearing;
The first rear cover and the motor accommodating portion are fixed only by engagement,
The first rear cover is replaceable with a second rear cover having a different color from the first rear cover.
Electric tool. a motor having a rotor and a stator that rotate around a rotating shaft extending in the front-rear direction;
an output section that is arranged on the front side of the motor and rotates based on the rotational force of the rotor;
a motor accommodating portion that accommodates the motor;
a rear rotor bearing that supports the rear part of the rotor;
a first rear cover disposed to cover an opening at a rear end of the motor accommodating portion and holding the rear rotor bearing;
The first rear cover is replaceable with a second rear cover having a different composition from the first rear cover.
Electric tool. the first rear cover and the motor accommodating portion are fixed only by engagement;
The power tool according to claim 25 or 40. The first rear cover is made of synthetic resin,
The second rear cover has a luminescent material portion,
A power tool according to claim 40. The second rear cover has a water-repellent plate.
A power tool according to claim 40. The first rear cover is made of synthetic resin,
The second rear cover is made of metal.
A power tool according to claim 40.

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