WO2017110229A1

WO2017110229A1 - Rotary tool

Info

Publication number: WO2017110229A1
Application number: PCT/JP2016/081309
Authority: WO
Inventors: 功二山中
Original assignee: 株式会社マキタ
Priority date: 2015-12-21
Filing date: 2016-10-21
Publication date: 2017-06-29
Also published as: JP2017113809A

Abstract

According to the present invention, a left-side split housing (15) is fitted to a hammer case (70). A left-side peripheral section (85) is disposed so as to cover a left-side engagement section (75) situated on the outer side of a left-side protruding section (55). A right-side split housing (16) is fitted to the hammer case (70). A right-side peripheral section (86) is disposed so as to cover a right-side engagement section (76) situated on the outer side of a right-side protruding section (56). A left-side male thread member (80) can be screwed and locked with a female thread section through an insertion hole, while a right-side male thread member (80) can be screwed and locked with a female thread section (58) through insertion holes (78, 88). Thus, a motor housing section (31) is screwed and locked with the female thread section (58) via the male screw members (80). This screwing and locking is performed in a direction that orthogonally intersects with the axial direction of an anvil.

Description

Rotating tool

The present invention relates to a rotary tool that rotates an output shaft.

Conventionally, a rotary tool represented by an impact driver is known (see Japanese Patent Application Laid-Open No. 2014-140909). This type of rotary tool incorporates a motor as a drive source. The motor rotates the motor shaft. The motor shaft inputs rotational driving force to the striking mechanism via the speed reduction mechanism. The input striking mechanism includes a hammer that rotates by receiving a rotational drive, and an anvil that rotates by receiving the rotational drive of the hammer. When a torque of a predetermined value or more is applied from the outside to the rotation operation of the output shaft, the hammering mechanism is disengaged from the anvil and idles. The spinning hammer strikes the anvil in the rotational direction, and the striking force is applied to the rotation operation of the output shaft. Such a striking mechanism is housed in the hammer case.

The hammer case is screwed to the housing that houses the motor via a male screw. At this time, the male screw is disposed in the axial direction (front-rear direction) in which the output shaft extends on the outer peripheral side, and the hammer case is screwed to the housing. For this reason, several screwing points for screwing are provided on the outer periphery of the hammer case. Such a screwing portion has a structure in which at least the length of the screw protrudes outward from the outer periphery of the hammer case, and the outer periphery of the hammer case becomes larger due to the protrusion. If it does so, there exists a point out that handling when this rotary tool is used in a narrow place will worsen.

The present invention has been made in view of such circumstances, and the problem to be solved by the present invention is to rotate the output shaft and apply a torque of a predetermined value or more to the rotation operation from the outside. A rotating tool that applies a striking force in the direction of rotation is to improve the handling efficiency even when used in a narrow place.

In solving the above-described problems, the rotary tool according to the present invention takes the following means.

A rotary tool according to a first aspect of the present invention is a rotary tool that rotates an output shaft, and includes a motor, a motor housing that houses the motor, and power that transmits a driving force of the motor to the output shaft. The case that includes the transmission mechanism and includes the power transmission mechanism is provided with a holding portion that holds an insertion member that is inserted in a direction intersecting the axial direction of the output shaft. The insertion member that allows the insertion member to be inserted is provided, and the insertion member held by the holding portion while being inserted into the insertion portion is moved relative to the case with respect to the case. It is the structure of regulating.

According to the rotary tool according to the first aspect of the invention, the insertion member held by the holding portion while being inserted into the insertion portion can regulate the relative movement of the motor housing with respect to the case. As a result, when restricting the relative movement of the motor housing with respect to the case, it is possible to stop placing a member for restricting the relative movement such as a male screw in the axial direction in which the output shaft extends as in the prior art. It is possible to reduce the thickness of the parts that have been used. Accordingly, it is possible to improve the handling efficiency when used as a rotary tool.

A rotary tool according to a second aspect of the present invention is the rotary tool according to the first aspect, wherein the case has a front case and a rear case separated in an output direction, and the holding portion is the rear portion. It is the structure of being provided in a case.

According to the rotary tool according to the second aspect of the invention, since the holding part is provided in the rear case separated in the output direction, the holding part can be provided while slimming the front part of the case. Accordingly, it is possible to improve the handling efficiency when used as a rotary tool.

A rotary tool according to a third aspect of the present invention is a rotary tool that rotates an output shaft, and includes a motor, a motor housing that houses the motor, and power that transmits the driving force of the motor to the output shaft. A case that includes the transmission mechanism and includes the power transmission mechanism includes a front case and a rear case that are separated in an output direction, and one of the front case and the rear case includes the front case and the rear case. A holding portion that holds an insertion member that is inserted in a direction intersecting the axial direction of the output shaft is provided, and the insertion member can be inserted into one of the front case and the rear case. And the insertion member held by the holding portion while being inserted into the insertion portion regulates relative movement of the other case with respect to the one case. is there

According to the rotary tool according to the third aspect of the invention, the insertion member held by the holding portion while being inserted into the insertion portion can regulate the relative movement of the other case with respect to the one case. Thereby, in restricting relative movement of the other case with respect to one case, it is possible to stop disposing a member that restricts relative movement such as a male screw in the axial direction in which the output shaft extends, It is possible to reduce the thickness of the arranged member portions. Accordingly, it is possible to improve the handling efficiency when used as a rotary tool.

The rotary tool according to a fourth aspect of the present invention is the rotary tool according to the third aspect, wherein the power transmission mechanism has a power transmission member for transmitting power, and the rear case supports the power transmission member. It is the structure of having the support part to do.

According to the rotary tool according to the fourth aspect of the invention, the rear case has the support portion that supports the power transmission member that transmits power, so that the front case can be slimmed. Accordingly, it is possible to improve the handling efficiency when used as a rotary tool.

A rotary tool according to a fifth aspect of the present invention is the rotary tool according to the third or fourth aspect, wherein the power transmission mechanism has a speed reduction mechanism, and the speed reduction mechanism is incorporated in the rear case. This is a configuration.

According to the rotary tool according to the fifth aspect of the invention, since the speed reduction mechanism is built in the rear case, the front case can be slimmed. Accordingly, it is possible to improve the handling efficiency when used as a rotary tool.

A rotary tool according to a sixth invention of the present invention is the rotary tool according to any one of the third to fifth inventions, wherein the power transmission mechanism has a striking mechanism that applies a striking force to a rotating operation, The front case is configured such that the striking mechanism is internally provided.

According to the rotary tool according to the sixth aspect of the present invention, since the front case is equipped with a striking mechanism that applies striking force to the rotating operation, the striking force can be efficiently transmitted to the output shaft. As a result, the mechanism can be simplified and the entire tool can be slimmed. Accordingly, it is possible to improve the handling efficiency when used as a rotary tool.

A rotary tool according to a seventh aspect of the present invention is the rotary tool according to any one of the third to sixth aspects, wherein the motor housing is fastened together with the holding portion via the insertion member. This is the configuration.

According to the rotary tool according to the seventh aspect of the invention, since the motor housing is fastened together with the holding portion via the insertion member, the motor housing can be assembled at the same time. As a result, when assembling the motor housing, it can also be used as an insertion member when assembling the case, reducing the number of assembling members, making the product slim, and improving the handling efficiency. Can do.

A rotary tool according to an eighth invention of the present invention is the rotary tool according to any one of the first to seventh inventions, wherein the holding portion is formed by a female screw, and the insertion member is connected to the female screw. This is a male screw that can be screwed together.

According to the rotary tool of the eighth invention, since the holding portion is formed by a female screw and the insertion member is a male screw that can be screwed with the female screw, the holding of the insertion member with respect to the holding portion is performed by screwing. Will be made. As a result, the holding of the insertion member with respect to the holding portion is ensured by screwing, and the screw fastening member can be abolished, the number of members to be assembled is reduced, the product is slimmed, and the handling is further performed. The goodness of the can be improved.

A rotary tool according to a ninth aspect of the present invention is a rotary tool that rotates an output shaft, and includes a motor, a motor housing that houses the motor, and power that transmits the driving force of the motor to the output shaft. A case that includes the transmission mechanism and that includes the power transmission mechanism includes a front case and a rear case that are separated in an output direction, and each of the front case and the rear case includes the output shaft. It is the structure that the fitting structure fitted together by making concave or convex in the rotation diameter direction is provided.

According to the rotary tool according to the ninth aspect of the present invention, each of the front case and the rear case is provided with a fitting structure that is fitted to each other by forming a concave or convex shape in the rotational radial direction of the output shaft. As a result, the relative rotation of the front case with respect to the rear case can be exerted. Therefore, the relative position of the front case with respect to the rear case can be fixed, and the stability of the product that makes it difficult for the rear case and the front case to come off can be enhanced.

A rotary tool according to a tenth aspect of the present invention is the rotary tool according to the ninth aspect, wherein one of the front case and the rear case has a direction intersecting the axial direction of the output shaft. A female screw to be screwed is provided, and one of the front case and the rear case is screwed to the female screw via a male screw. The female screw is a shaft of the output shaft. It is the structure of being provided in the said fitting structure so that a screw stop is possible in the direction which cross | intersects a direction.

According to the rotary tool of the tenth invention, when either the front case or the rear case is screwed to the female screw via the male screw, the screw is screwed in the direction intersecting the axial direction of the output shaft. The As a result, the male screw is not disposed in the axial direction in which the output shaft extends as in the conventional case, and the portion where the output shaft is disposed can be slimmed. Accordingly, it is possible to improve the handling efficiency when used as a rotary tool.

It is a side view which shows the impact driver which removed the right side division housing. It is sectional drawing which shows an impact driver in a right-and-left half sectional view. It is sectional drawing which shows an impact driver by the (III)-(III) sectional arrow of FIG. It is a front perspective view illustrating a housing before assembling. FIG. 5 is a rear perspective view illustrating a state in which the bearing box and the hammer case are assembled in FIG. 4. FIG. 6 is a front perspective view illustrating a state before assembling a bearing box and a hammer case different from those in FIG. 5.

Hereinafter, an embodiment for carrying out the rotary tool according to the present invention will be described with reference to FIGS. 1 to 3, an impact driver 10 is illustrated. In the side view of the impact driver 10 of FIG. 1, the right split housing 16 is removed. The cross-sectional view of the impact driver 10 in FIG. A cross-sectional view of the impact driver 10 in FIG. 3 is indicated by (III)-(III) cross-sectional arrows in FIG. The front perspective view of FIG. 4 illustrates the housing 14, the bearing box 50, and the hammer case 70 before assembly. The rear perspective view of FIG. 5 illustrates a state in which the bearing box 50 and the hammer case 70 are assembled in FIG.

The impact driver 10 shown in FIGS. 1 to 4 is a pistol-type tool for rotating an anvil 66 as an output shaft, and corresponds to the rotary tool according to the present invention. More specifically, the impact driver 10 corresponds to a rotary impact tool. Hereinafter, the impact driver 10 will be described based on the “front / rear / up / down / left / right” directions as shown in the drawings. Incidentally, the lower side of the impact driver 10 is defined based on the arrangement side of the grip portion 20. Further, the front side of the impact driver 10 is defined based on the arrangement side of the anvil 66. The anvil 66 corresponds to the output shaft according to the present invention. That is, this front side corresponds to the output side according to the present invention. The impact driver 10 shown in FIGS. 1 to 3 shows only the tool body 11. That is, when used as the impact driver 10, an electric tool battery (not shown) is mounted on the battery mounting portion 13 set at the lower portion of the tool body 11.

電動 The battery for the power tool serves as a power source for the impact driver 10. As this battery for electric tools, BL1450 made from Makita Corporation is mentioned, for example. The power tool battery is mounted by sliding the battery mounting portion 13 from front to back. The power tool battery is removed by sliding the battery mounting portion 13 from the rear to the front while pressing the lock release button of the power tool battery. When used as the impact driver 10, a screw tightening bit B as a tip tool is attached to the anvil 66 set at the front portion of the tool body 11.

The impact driver 10 shown in FIGS. 1 to 4 functions as a rotary impact tool. That is, the impact driver 10 rotates the anvil 66 and applies a striking force in the rotation direction when a torque greater than a predetermined value is applied from the outside to the rotation operation. The illustrated tool body 11 generally includes a battery mounting portion 13, a grip portion 20, a motor portion 30, and a hammer portion 40. The battery mounting unit 13 is mounted with a power tool battery (not shown) as described above. The battery mounting part 13 is provided in the lower part of the housing 14.

As shown in FIGS. 3 and 4, the housing 14 is formed by combining the left divided housing 15 and the right divided housing 16 which are divided in the left-right direction intersecting the axial direction (front-rear direction) of the anvil 66. The Incidentally, the housing 14 also serves as a grip housing portion 21 and a motor housing portion 31 which will be described in detail later.

As shown in FIGS. 1 and 2, the battery mounting portion 13 has a rail structure 131 and a locking structure 132 that can be attached and detached by sliding a power tool battery (not shown). Further, the battery mounting part 13 has a terminal (not shown) supported at the lower part of the housing 14. The terminal can be electrically connected to the attached power tool battery. The front end of the battery mounting portion 13 is formed so that the front end and the front end of a hammer portion 40, which will be described later, substantially coincide with each other. Further, the rear end of the battery mounting portion 13 is formed so that the front and rear positions of the rear end of the motor portion 30 described later substantially coincide. Although not shown like the terminal, a controller (not shown) is housed inside the housing 14 immediately above the battery mounting portion 13. In addition, an operation display unit 17 is provided on the upper side of the battery mounting unit 13 protruding to the front side.

As shown in FIGS. 1 to 4, a grip portion 20 is provided on the upper side of the battery mounting portion 13. The grip part 20 is formed as a part gripped by the user's hand. The grip portion 20 is formed by a grip housing portion 21 that is a part of the housing 14. The grip part 20 is formed by extending the grip housing part 21 in the vertical direction intersecting the axial direction (front-rear direction) of the anvil 66. Therefore, the impact driver 10 has a pistol shape that is excellent in handling from the position of the grip portion 20 and the anvil 66. The shape of the grip housing portion 21 is selected so that the finger grip is improved when the user grips it with the hand.

An operation switch 22 is provided on the upper portion of the grip housing portion 21. The operation switch 22 includes a switch main body 23 housed in the grip housing portion 21, a trigger member 24 that is pushed into the switch main body 23, and a switching knob 25 that switches the forward / reverse rotation direction of the anvil 66. The operation signal input to the operation switch 22 is transmitted to a controller (not shown). In addition, the shape of the grip housing part 21 located on the rear side of the operation switch 22 has a concave shape that facilitates the insertion between the thumb and the index finger when grasped by the user's hand. Further, an LED irradiation device 26 capable of irradiating the front of the impact driver 10 is provided above the trigger member 24.

As shown in FIGS. 1 and 2, on the upper side of the grip portion 20, a motor portion 30 and a hammer portion 40 are arranged in the order of rear and front. The motor unit 30 is configured by incorporating a brushless motor 33 serving as a drive source in a motor housing unit 31 serving as a part of the housing 14. The motor housing portion 31 supports the brushless motor 33 and also supports a bearing box 50 and a hammer case 70 which will be described in detail later. The brushless motor 33 is configured in the same manner as a normal brushless motor. That is, the brushless motor 33 includes a rotor that rotates integrally with the motor shaft 35, a stator that rotates the rotor, and a sensor substrate that detects the rotational position of the rotor, although not shown. A permanent magnet is attached to the rotor. The stator generates a magnetic force when a coil is wound and a current flows. The sensor substrate is disposed on the front side of the rotor and detects the rotational position of the rotor.

The motor shaft 35 is disposed so as to extend in the front-rear direction. The front side of the motor shaft 35 is supported by a front bearing 351 supported by the motor housing portion 31, and the rear side is supported by a rear bearing 352 supported by the cap member 32. A fan 36 that rotates integrally with the motor shaft 35 is attached to the rear portion of the motor shaft 35. The fan 36 is attached to the motor shaft 35 on the rear side of the rotor and on the front side of the rear bearing 352. The fan 36 is a centrifugal fan. The fan 36 rotates integrally with the motor shaft 35 to exhaust the cooling air that has cooled the stator through the exhaust slit 361 to the outside. On the other hand, an input gear 37 is attached to the front end of the motor shaft 35. The input gear 37 meshes with a planetary gear 42 of a speed reduction mechanism 41 of the hammer portion 40 described below.

As shown in FIGS. 3 and 4, the rear end of the motor housing portion 31 formed by combining the left divided housing 15 and the right divided housing 16 is opened (reference numeral 311 in FIG. 4), and the opening is a cap member 32. (See FIGS. 1 and 2). The cap member 32 is integrated with the motor housing portion 31 by being locked to the rear portions of the left divided housing 15 and the right divided housing 16. The cap member 32 holds the rear bearing 352 at a substantially central location.

As shown in FIG. 1, the cap member 32 is provided with an exhaust slit 361 that allows communication between the outside and the inside. A large number of exhaust slits 361 are provided in the cap member 32 so as to be lined up over the facing range of the outer periphery of the fan 36.

Note that, as well shown in FIG. 4, the left split housing 15 and the right split housing 16 are held together at eight screwing points (indicated by reference numeral 18). Specifically, the battery mounting part 13 is provided with two screwing points (indicated by reference numeral 18), the grip part 20 is provided with two screwing points (indicated by reference numeral 18), the motor part 30 and the hammer part. Each of 40 is provided with one screwing point (reference numeral 18).

As shown in FIG. 1 and FIG. 2, a hammer part 40 is arranged on the front side of the motor part 30. The hammer part 40 is supported by the motor housing part 31. The hammer part 40 generally includes a speed reduction mechanism 41 and a striking mechanism 61. The speed reduction mechanism 41 decelerates the rotational drive of the motor shaft 35 and inputs it to the striking mechanism 61. The speed reduction mechanism 41 is supported by the bearing box 50, and the striking mechanism 61 is supported by the hammer case 70. Before describing the bearing box 50 and the hammer case 70, the reduction mechanism 41 and the striking mechanism 61 that are internally supported by the bearing box 50 and the hammer case 70 will be described. The speed reduction mechanism 41 corresponds to the first power transmission mechanism according to the present invention. The striking mechanism 61 corresponds to the second power transmission mechanism according to the present invention. Further, the speed reduction mechanism 41 and the striking mechanism 61 correspond to a power transmission mechanism according to the present invention. That is, the speed reduction mechanism 41 and the striking mechanism 61 are disposed on the output side of the motor housing portion 31.

The deceleration mechanism 41 is composed of a widely used planetary gear mechanism. As shown in FIG. 3, the speed reduction mechanism 41 has three planetary gears 42 that mesh with the input gear 37 described above. The planetary gear 42 is rotatably supported by a carrier 47 disposed on the output side via a support shaft 46. The planetary gear 42 meshes with an internal gear 45 disposed on the outer peripheral side. That is, the planetary gear 42 rotates when a rotational driving force is transmitted from the meshing input gear 37 and revolves in the meshing internal gear 45. The revolution of the planetary gear 42 becomes the rotation of the carrier 47. The carrier 47 integrally rotates the drive shaft 62 that is integrated.

As shown in FIG. 2, the carrier 47 is rotatably supported by a rear bearing 48 and an accommodation recess 669 provided in the anvil 66. The bearing 48 is supported by the bearing box 50, and the internal gear 45 is fixed and held in the bearing box 50 so as not to be relatively rotatable. That is, the carrier 47 corresponds to the power transmission member according to the present invention, and the bearing 48 corresponds to the support portion according to the present invention. The internal gear 45 is restricted from coming out of the bearing box 50 by a retaining ring 49 that is locked in the bearing box 50.

As shown in FIG. 2, the striking mechanism 61 generally includes a drive shaft 62, a steel ball 63, a hammer 64, a compression spring 65, and an anvil 66. The drive shaft 62, the steel ball 63, the hammer 64, the compression spring 65, and the anvil 66 are housed and supported in the hammer case 70. The drive shaft 62 is rotationally driven together with the integrated carrier 47. A steel ball holding recess 621 is provided on the peripheral surface of the drive shaft 62. The steel ball holding recess 621 is formed in a concave shape capable of accommodating half of the super hard sphere steel ball 63. The concave shape of the steel ball holding concave portion 621 is a concave shape extending in the front-rear direction. That is, the steel ball 63 can roll in the steel ball holding recess 621 extending in the tilt direction.

In contrast, a hammer 64 having an appropriate weight is also provided with a guide groove 641 on which the steel ball 63 rolls. The guide groove 641 is provided at a location where it can face the steel ball holding recess 621 by relative rotation. The guide groove 641 is also formed in a concave shape that can accommodate half of the superhard steel ball 63. The concave shape of the guide groove 641 is a concave shape extending in the front-rear direction. That is, the steel ball 63 can roll in the guide groove 641 extending in the front-rear direction. The hammer 64 is provided with a housing recess 643 for housing the compression spring 65. The housing recess 643 has a concave shape that is bent in the front-rear direction. The front end of the compression spring 65 contacts the inner end on the front side of the housing recess 643.

The compression spring 65 is formed by compressing a coil spring. The compression spring 65 has a rear end in contact with and supported by the carrier 47 and a front end in contact with and supported in the housing recess 643 to constantly urge the hammer 64 forward. A striking piece 645 is provided on the front surface of the hammer 64 so as to protrude forward. The striking piece 645 has a protruding shape that hits a striking arm 665 provided at the rear end of the anvil 66. Two hitting piece portions 645 are provided on the front surface of the hammer 64 at intervals of 180 degrees in the circumferential direction. Two striking arm portions 665 are also provided at the rear end of the anvil 66 at intervals of 180 degrees in the circumferential direction.

The striking arm portion 665 extends in an arm shape radially outward from the rear end of the anvil body 661 to a position facing the striking piece portion 645. The anvil 66 has an anvil body 661 and the hitting arm portion 665 described above. The anvil body 661 is formed in a substantially cylindrical shape that extends in the front-rear direction. The outer periphery of the anvil body 661 is in contact with the needle bearing 663. The needle bearing 663 is held at the front portion of the hammer case 70 and rotatably supports the anvil 66. A bit holding mechanism 67 for holding the bit B is provided at the front end of the anvil body 661. The bit holding mechanism 67 holds the bit B accommodated in the interior 662 of the anvil body 661 extending in the axial direction.

The striking mechanism 61 operates as follows. That is, when a torque of a predetermined value or more is applied to the rotation operation of the anvil 66, a relative displacement is generated between the drive shaft 62 and the hammer 64 in the rotation direction. This relative displacement has the effect of moving the steel ball 63 against the urging force of the compression spring 65 inside both the steel ball holding recess 621 and the guide groove 641. As a result, the hammer 64 moves backward relative to the drive shaft 62, and the hitting piece portion 645 that has been in contact with the hitting arm portion 665 until then is detached from the hitting arm portion 665. When the striking piece portion 645 is detached from the striking arm portion 665 as described above, the hammer 64 is idled instantaneously, and receives the urging force of the compression spring 65 and again strikes the striking arm portion 665. This hit is the striking force applied to the rotating motion of the anvil 66.

Next, the bearing box 50 that accommodates and holds the above-described reduction mechanism 41 and the hammer case 70 that accommodates and holds the hitting mechanism 61 will be described. The bearing box 50 corresponds to the rear case according to the present invention and the first case according to the present invention. The hammer case 70 corresponds to the front case according to the present invention and the second case according to the present invention. Further, the bearing box 50 and the hammer case 70 correspond to the case according to the present invention. That is, both the bearing box 50 and the hammer case 70 have a case shape in which they are integrated with each other. In other words, the bearing box 50 and the hammer case 70 that can be integrated with each other are formed to be separable in the front-rear direction. Inside the bearing box 50 and the hammer case 70, the speed reduction mechanism 41 and the striking mechanism 61 are accommodated and held. The bearing box 50 corresponds to one of the front case and the rear case according to the present invention, and corresponds to either the first case or the second case according to the present invention. On the other hand, the hammer case 70 corresponds to the other of the front case and the rear case according to the present invention, and corresponds to the other of the first case and the second case according to the present invention.

As shown in FIGS. 4 and 5, the bearing box 50 and the hammer case 70 are both formed of metal. The bearing box 50 has an annular peripheral wall body 51. A rear wall 52 formed in an inner flange shape is connected to the rear end edge of the peripheral wall main body 51. In the center of the rear wall portion 52, an opening portion 521 that allows the input gear 37 to be inserted into the bearing box 50 is provided. Near the periphery of the opening 521, a bearing accommodating support 522 that accommodates and supports the bearing 48 is provided. On the other hand, the front end edge of the peripheral wall body 51 does not have an inner flange shape like the rear wall portion 52, and opens toward the inside of the hammer case 70. On the upper part of the peripheral wall main body 51 of the bearing box 50, a left overhang portion 55 and a right overhang portion 56 are provided in pairs on the left and right sides. The left projecting portion 55 and the right projecting portion 56 are provided so as to protrude from the peripheral surface of the peripheral wall body 51 so as to protrude outward in the rotational radial direction of the anvil 66.

As shown in FIG. 3, the left overhang 55 and the right overhang 56 are provided symmetrically with respect to the axis of the anvil 66 (output shaft). The left overhang 55 and the right overhang 56 are provided on the peripheral wall main body 51 below the upper vertex 511 of the peripheral wall main body 51. Further, the left overhanging portion 55 and the right overhanging portion 56 are provided on the peripheral wall main body 51 above the left and right side apexes 513 and 514 of the peripheral wall main body 51. The left overhang 55 is located on the right side of the left apex 513, and the right overhang 56 is located on the left side of the right apex 514. That is, the left overhang 55 and the right overhang 56 are provided with

upper surface portions

551 and 561 that both face upward. The left overhanging portion 55 and the right overhanging portion 56 are provided with

side surface portions

552 and 562 that face the sides (left and right sides).

As shown in FIGS. 4 to 6, the

upper surface portions

551 and 561 are formed to have a surface shape extending in the horizontal direction. The

side surface portions

552 and 562 are formed to have a surface shape extending in the vertical direction. For this reason, the left overhanging portion 55 and the right overhanging portion 56 are provided so that substantially rectangular corners protrude outward in the rotational radial direction due to the surface shape facing upward and laterally. These

side portions

552 and 562 are provided with

female screw portions

57 and 58, respectively. The

female screw portions

57 and 58 are formed by being cut into female screws in the horizontal direction facing each other with respect to the left overhang portion 55 and the right overhang portion 56. A male screw member 80 is screwed to these

screw portions

57 and 58 in a direction crossing the axial direction of the anvil 66 as an output shaft. That is, these

female screw portions

57 and 58 are female screws that can be screwed in the left-right direction orthogonal to the axial direction of the anvil 66. The male screw member 80 is a female screw that is screwed to the

female screw portions

57 and 58, and is similarly screwed in the left-right direction orthogonal to the axial direction of the anvil 66. The

female screw portions

57 and 58 correspond to the female screw and the holding portion according to the present invention, and the male screw member 80 corresponds to the male screw and the insertion member according to the present invention.

Further, as shown in FIG. 4, the hammer case 70 has a left side fitting part 75 and a right side fitting part 76 corresponding to the left side extension part 55 and the right side extension part 56 provided on the peripheral wall body 51 of the bearing box 50. Is provided. The left fitting portion 75 and the right fitting portion 76 are also provided so as to protrude in pairs on the left and right sides. The left side fitting part 75 and the right side fitting part 76 are provided so that the left overhanging part 55 and the right overhanging part 56 can be fitted inside at the same time by assembling the hammer case 70 to the bearing box 50 in the front-rear direction. ing. That is, the left fitting portion 75 is formed to have an internal shape corresponding to the external shape of the left overhang portion 55. The right fitting portion 76 has an internal shape corresponding to the external shape of the right overhang portion 56.

The left fitting portion 75 and the right fitting portion 76 are formed with an appropriate space shape into which the left protruding portion 55 and the right protruding portion 56 can be fitted. As shown in FIG. 5, when the left fitting portion 75 and the right fitting portion 76 are fitted to the left protruding portion 55 and the right protruding portion 56, the fitting protruding outward in the rotational radial direction is the hammer case 70. This restricts the circumference of the bearing box 50 in the circumferential direction. That is, the relative rotation between the bearing box 50 and the hammer case 70 is restricted. Thus, the fitting of the left overhanging portion 55 and the right overhanging portion 56 of the left fitting portion 75 and the right fitting portion 76 is fitted by projecting outwardly in the rotation radial direction of the anvil 66. Is set as

The left fitting portion 75 and the right fitting portion 76 are also provided with

upper surface portions

751 and 761 that both face upward, and both have

side surface portions

752 and 762 that face sideways (left and right sides). It has been. The

side surface portions

752 and 762 are provided with

insertion holes

77 and 78 penetrating in the left-right direction. The insertion holes 77 and 78 are through holes that allow the male screw member 80 as an insertion member to be inserted. The insertion holes 77 and 78 correspond to the insertion portion according to the present invention. When the bearing box 50 is assembled to the hammer case 70 and the left overhanging portion 55 and the right overhanging portion 56 are fitted into the left fitting portion 75 and the right fitting portion 76, the male screw member 80 is inserted into the insertion hole 77. , 78 can be screwed to the

female screw portions

57, 58.

As shown in FIGS. 3 and 4, the motor housing portion 31 also has a left outer peripheral portion 85 and a right outer peripheral portion 86 corresponding to the left projecting portion 55 and the right projecting portion 56 provided on the peripheral wall body 51 of the bearing box 50. Is provided. The left outer peripheral portion 85 and the right outer peripheral portion 86 are also provided so as to protrude in pairs on the left and right sides of the motor housing portion 31. The left outer peripheral portion 85 is provided so that a left fitting portion 75 fitted with the left overhang portion 55 can be fitted therein when the left divided housing 15 is assembled to the hammer case 70 assembled to the bearing box 50. The right outer peripheral portion 86 is provided so that a right fitting portion 76 fitted with a right overhang portion 56 can be fitted therein when the right divided housing 16 is assembled to the hammer case 70 assembled to the bearing box 50. Yes.

Specifically, the left outer peripheral portion 85 is formed to have an internal shape corresponding to the external shape of the left fitting portion 75. Further, the right outer peripheral portion 86 is formed having an internal shape corresponding to the external shape of the right fitting portion 76. The left outer peripheral portion 85 and the right outer peripheral portion 86 are formed with appropriate space shapes into which the left fitting portion 75 and the right fitting portion 76 can be fitted. When the left outer peripheral portion 85 and the right outer peripheral portion 86 are engaged with the left fitting portion 75 and the right fitting portion 76, the fitting protruding outward in the rotational radial direction is the circumference of the hammer case 70 with respect to the motor housing portion 31. It will be restricted around the direction. That is, the relative rotation between the hammer case 70 and the motor housing portion 31 is restricted.

The left outer peripheral portion 85 and the right outer peripheral portion 86 are both provided with

upper surface portions

851 and 861 facing upward, and both are provided with

side surface portions

852 and 862 facing laterally (left and right sides). Yes. The

side surface portions

852 and 862 are also provided with

insertion holes

87 and 88 penetrating in the left-right direction. The insertion holes 87 and 88 are also through holes that allow the male screw member 80 to be inserted. When the left split housing 15 is assembled to the hammer case 70 to which the bearing box 50 is assembled, the left outer peripheral portion 85 covers the left fitting portion 75 outside the left overhang portion 55. When the right split housing 16 is assembled to the hammer case 70 to which the bearing box 50 is assembled, the right outer peripheral portion 86 covers the right fitting portion 76 outside the right overhang portion 56. Then, the left male screw member 80 can be screwed to the female screw portion 57 through the insertion holes 77 and 87, and the right male screw member 80 can be screwed to the female screw portion 58 through the insertion holes 78 and 88. It becomes. That is, the motor housing portion 31 is fastened together with the hammer case 70 to the

female screw portions

57 and 58 via the male screw member 80.

According to the impact driver 10 of the above-described embodiment, the following operational effects are achieved.

First, according to the impact driver 10 described above, when the motor housing portion 31 is screwed to the

female screw portions

57 and 58 via the male screw member 80, the motor housing portion 31 is screwed in a direction orthogonal to the axial direction of the anvil 66. The Accordingly, the male screw member 80 screwed into the

female screw portions

57 and 58 while being inserted into the insertion holes 77 and 78 can restrict the relative movement of the motor housing portion 31 with respect to the bearing box 50. As a result, when the relative movement of the motor housing portion 31 with respect to the bearing box 50 is restricted, there is no need to place a male screw member in the axial direction in which the anvil 66 extends as in the prior art, and the place where it is placed can be made slim. Can be planned. Therefore, it is possible to improve the handling efficiency when used as the impact driver 10.

Further, according to the impact driver 10 described above, the hammer case 70 and the bearing box 50 have the

fitting structures

55, 56, 75, and 76 that are fitted to each other by projecting in the rotational radial direction of the anvil 66. Is provided. Accordingly, the relative rotation of the hammer case 70 with respect to the bearing box 50 can be exerted. Therefore, the relative position of the hammer case 70 with respect to the bearing box 50 can be fixed, and the stability of the product that makes it difficult for the bearing box 50 and the hammer case 70 to come off can be enhanced. Further, according to the impact driver 10 described above, the female screw portion 57 via the male screw member 80 with respect to the place (illustrated reference numerals 55 (56), 75 (76), 85 (86)) forming this fitting structure. , 58 are screwed. As a result, an overhanging structure having a plurality of functions can be provided, and an anti-rotation effect can be efficiently achieved while achieving slimming.

Incidentally, the front perspective view of FIG. 6 illustrates a state before the bearing box 50A and the hammer case 70A, which are different from those in FIG. 5, are assembled. In the example of FIG. 6 as well, the power transmission mechanism 40A is housed in the hammer case 70A and the bearing box 50A. Here, the hammer case 70 </ b> A and the bearing box 50 </ b> A are configured so as to be integrated with each other by a male screw 54 and a female screw 74. That is, a male screw 54 is formed on the outer periphery of the front portion of the peripheral wall body 51 of the bearing box 50A. On the other hand, a female screw 74 is formed on the inner periphery of the rear part of the hammer case 70. In the example of FIG. 6, the portion having the above-described fitting structure is not set in the hammer case 70 </ b> A, and the left outer peripheral portion 85 and the right outer peripheral portion 86 are directly connected to the left overhang portion 55 and the right overhang portion 56. It is to be covered.

Here, the screw tightening direction of the male screw 54 with respect to the female screw 74 coincides with the striking action direction of the striking mechanism 61 (the rotation direction of the anvil 66). That is, the hammer case 70 is subjected to the striking reaction of the striking mechanism 61, and the male screw 54 rotates in the screw tightening direction with respect to the female screw 74 due to this striking reaction. As a result, the male screw 54 does not come off even when subjected to a striking reaction against the female screw 74, and the relative position of the hammer case 70 with respect to the bearing box 50 can be fixed without loosening.

Note that the rotary tool according to the present invention is not limited to the above-described embodiment, and can be configured with appropriate modifications.

For example, in the above-described embodiment, the impact driver 10 is cited as an example of the rotary tool, and this will be described. However, the rotary tool according to the present invention may be configured with an impact wrench, a driver drill, a hammer drill, or the like, and can select an electric tool that generates an appropriate rotation or rotation hit. it can. In that case, the power transmission mechanism is not limited to the above-described embodiment, and an appropriate mechanism can be adopted.

Further, the power transmission mechanism may be configured by having a plurality of mechanisms, and may be configured by being divided into a plurality of cases as well.

In the above-described embodiment, the holding portion according to the present invention is formed by the

female screw portions

57 and 58, and the insertion member according to the present invention is formed by the male screw member 80. However, the holding | maintenance part which concerns on this invention should just be formed so that the insertion member can be hold | maintained, for example, may be formed with the hole which can hold | maintain an insertion member. The insertion member in such a case is formed of a pin-shaped member that can be inserted into the hole as the holding portion.

Claims

A rotary tool for rotating the output shaft,
A motor, a motor housing that houses the motor, and a power transmission mechanism that transmits the driving force of the motor to the output shaft;
The case that houses the power transmission mechanism is provided with a holding portion that holds an insertion member that is inserted in a direction intersecting the axial direction of the output shaft,
The motor housing is provided with an insertion portion that allows the insertion member to be inserted,
The insertion member held by the holding portion while being inserted into the insertion portion restricts relative movement of the motor housing with respect to the case.
The rotary tool according to claim 1, wherein
The case has a front case and a rear case separated in the output direction;
The holding part is a rotary tool provided in the rear case.
A rotary tool for rotating the output shaft,
A motor, a motor housing that houses the motor, and a power transmission mechanism that transmits the driving force of the motor to the output shaft;
The case that houses the power transmission mechanism has a front case and a rear case that are separated in the output direction,
Either one of the front case and the rear case is provided with a holding portion that holds an insertion member that is inserted in a direction intersecting the axial direction of the output shaft,
The other part of the front case and the rear case is provided with an insertion portion that allows the insertion member to be inserted,
The insertion member held by the holding portion while being inserted into the insertion portion restricts relative movement of the other case with respect to the one case.
The rotary tool according to claim 3,
The power transmission mechanism has a power transmission member for transmitting power,
The said rear case is a rotary tool which has a support part which supports the said power transmission member.
The rotary tool according to claim 3 or 4,
The power transmission mechanism has a speed reduction mechanism,
A rotary tool in which the speed reduction mechanism is built in the rear case.
The rotary tool according to any one of claims 3 to 5,
The power transmission mechanism has a striking mechanism that applies a striking force to the rotation operation,
A rotary tool in which the striking mechanism is housed in the front case.
The rotary tool according to any one of claims 3 to 6,
The motor housing is a rotary tool that is fastened to the holding portion via the insertion member.
The rotary tool according to any one of claims 1 to 7,
The holding portion is formed of a female screw,
The insertion member is a rotary tool that is a male screw that can be screwed into the female screw.