JP2013244561A - Electric tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric tool capable of further improving construction of a cooling structure of an electric motor.SOLUTION: An electric tool is provided with a motor 110 for driving a front end tool 119. The motor 110 includes a stator 111, a rotor 112, and a rotating shaft 113 having the rotor 112 mounted thereto, and is configured as an outer rotor type motor in which the rotor 112 is arranged outside the stator 111. The rotor is formed in a wind wheel shape for generating cooling air current used to cool the motor 110.

Description

  The present invention relates to an electric tool that performs a predetermined machining operation on a workpiece by driving a tip tool with a motor.

  US Patent Publication No. 2011-0241457 (Patent Document 1) discloses an electric scissor that performs mowing work with a tip saw driven by an electric motor. In the case of an electric tool that performs a predetermined machining operation on a workpiece by driving a tip tool with an electric motor, not limited to a scissor, the electric motor generates heat during the machining operation, and therefore the electric motor is cooled to protect it from heat. There is a need. In the electric tool described in Patent Document 1, a cooling fan is attached to the rotor of the electric motor in order to cool the electric motor by generating an air flow inside the electric motor. There is room for further improvement.

US Patent Publication No. 2011-0241457

  The present invention has been made in view of the above, and an object thereof is to provide an electric tool that is further improved with regard to the construction of a cooling structure for an electric motor.

  In order to solve the above problem, according to a preferred embodiment of the present invention, an electric tool including a motor for driving a tip tool is configured. The motor is configured as an outer rotor type motor having a stator, a rotor, and a rotating shaft to which the rotor is attached, and the rotor being disposed outside the stator. As described above, when the motor is an outer rotor type motor in which the rotor is arranged outside the stator, the outer diameter of the rotating portion is large and a large rotor inertia moment can be provided. For this reason, compared with an inner rotor type motor, a big torque can be generated. This makes it possible to reduce the size, weight, and operability of the fuselage compared to conventional electric tools equipped with an inner rotor type motor that requires a speed reduction mechanism between the motor and the tip tool driven by the motor. It becomes effective in. Further, when the output of the motor is constant, a large torque can be generated, so that the number of rotations can be lowered, so that vibration of the electric tool due to motor vibration can be reduced.

According to a preferred embodiment of the electric power tool according to the present invention, the rotor is formed in a blade shape for generating cooling air used for cooling the motor.
According to the present invention, the rotor is configured to have a blade shape for generating cooling air. In other words, the cooling fan is formed integrally with the rotor. For this reason, compared with the case where the cooling fan formed separately is attached to a rotor, while being able to reduce in weight and size, an assembly operation becomes unnecessary.

According to the further form of the electric tool which concerns on this invention, the motor is provided with the 1st opening which connects the inside and the exterior of the said motor at the edge part of a motor axial direction.
According to this aspect, the cooling air can be circulated between the inside and the outside of the motor through the first opening.

According to the further form of the electric tool which concerns on this invention, it has a housing which accommodates a motor, and the 2nd opening which connects the inside and the exterior of the said housing is formed in the surface of the edge part of the motor axial direction in a housing. ing.
According to this aspect, the cooling air can be circulated between the outside and the inside of the housing through the second opening.

According to the further form of the electric tool which concerns on this invention, a rotor has an end surface extended in the direction which cross | intersects the axial direction of the said rotor, and connected with a rotating shaft. And the vent hole is formed in the said end surface, and the end surface of the rotor containing a vent port is formed in the blade | wing shape. In the case of an outer rotor type motor in which the rotor is disposed outside the stator, an end surface extending in a direction crossing the axial direction is set on the rotor in order to connect to the rotating shaft. Here, “the end surface is formed in a blade shape” is a mode in which a vent hole that extends in an inclined manner at a predetermined angle in the axial direction of the end surface from one end to the other end in the axial direction of the end surface is formed. It corresponds to this. The vent may be in any form extending linearly or in a curved form.
According to this embodiment, the cooling air is circulated between the outside and the inside of the motor as the end face of the rotor rotates by forming the vent hole in the end face extending in the direction intersecting the axial direction. be able to.

According to the further form of the electric tool which concerns on this invention, the ventilation port which connects the inside and the exterior of the said rotor is formed in the side surface of the said rotor, The side surface of the rotor containing a ventilation port is blade shape Is formed. The “blade shape” formed on the side surface of the rotor is typically formed into a blade shape of a centrifugal fan in which cooling air flows from the inside to the outside of the rotor. Specifically, the side surface of the rotor is configured by providing a slit that is inclined at a predetermined angle with respect to the radial straight line, and the slit is any of a mode extending linearly or a mode extending curved. It doesn't matter.
According to this form, by setting it as the structure which forms the side surface of a rotor in a blade | wing shape, it becomes the setting using a wide surface and can ensure the ventilation capability easily. Accordingly, the heat generated in the motor can be efficiently radiated by flowing the cooling air from the inside of the motor to the outside.

According to the further form of the electric tool which concerns on this invention, it has a drive mechanism driven with a motor and drives a tip tool. And the cooling air which cooled the motor is set as the structure which passes a drive mechanism, and it is set as the structure which cools the said drive mechanism by this.
According to this aspect, the drive mechanism can be cooled by the cooling air after cooling the motor, and a rational cooling system can be constructed.

According to the further form of the electric power tool according to the present invention, the tip tool is configured as a hammer bit that performs work by applying a linear impact force to the workpiece, and the drive mechanism has at least the hammer bit lengthened. A striking mechanism that strikes in the axial direction is provided.
According to this aspect, in the electric tool for performing hammering work by applying a linear impact force to the workpiece, that is, the electric impact tool, the hammer bit for generating cooling air in the rotor per motor. By forming the shape, the impact tool can be reduced in weight compared to the case where a cooling fan is provided separately. In addition, it is possible to reduce the size of the impact tool in the direction of the rotation axis of the motor by reducing the length.

According to the further form of the electric tool which concerns on this invention, a drive mechanism has a crank mechanism which converts the rotational motion of a motor into linear motion, and drives a striking mechanism. The motor is disposed such that the rotation shaft of the motor intersects the striking axis of the striking mechanism, and the rotation shaft of the motor and the rotation shaft of the crank mechanism are disposed coaxially.
According to this aspect, in the impact tool of the type in which the rotation axis of the motor is arranged to intersect with the hammer axis of the hammer bit, both the rotation axis of the motor and the rotation axis of the crank mechanism are arranged coaxially. It is possible to further reduce the axial length by the amount that no other power transmission member is interposed between the shafts. As a result, the motor can be arranged close to the striking axis line of the striking mechanism and the center of gravity of the striking tool can be brought close to the striking axis, so that the moment generated around the center of gravity during hammering is reduced and the usability is improved.

  According to the present invention, an electric tool further improved with respect to construction of a cooling structure for an electric motor is provided.

It is sectional drawing which shows the whole structure of the electric hammer which concerns on embodiment of this invention. It is a top view which shows an electric hammer with a half cross section. It is a bottom view of an electric hammer. FIG. 2 is a partially enlarged view of FIG. 1. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is a figure explaining the modification of the inlet port formed in a rotor bottom part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. This embodiment will be described using an electric hammer as an example of an electric tool. As shown in FIG. 1, the electric hammer 100 is mainly configured by a main body portion 101 as a tool main body that forms an outline of the electric hammer 100. A hammer bit 119 is detachably attached to the distal end region of the main body 101 via a cylindrical tool holder 159. The hammer bit 119 is mounted so as to be relatively movable in the major axis direction with respect to the tool holder 159 and to rotate integrally in the circumferential direction. The hammer bit 119 corresponds to the “tip tool” in the present invention.

  A hand grip 107 gripped by the operator is connected to the end of the main body 101 opposite to the tip region. The handgrip 107 extends in the vertical direction in FIG. 1 intersecting the major axis direction of the hammer bit 119, and is substantially D-shaped in a side view in which each end in the extending direction is connected to the main body 101. It is provided as a main handle.

  In the present embodiment, for convenience, the hammer bit 119 side in the longitudinal direction of the main body 101 is defined as “front side” or “front side”, and the handgrip 107 side is defined as “rear side” or “rear side”. ”. 1 is defined as “upper side” or “upper side”, and the lower side of the page is defined as “lower side” or “lower side”.

  The main body 101 is configured as a double housing structure including an outer housing 103 that covers the outside and an inner housing 104 that is disposed inside the outer housing 103. The inner housing 104 is formed in a long shape extending in the front-rear direction, and is disposed in the upper space of the outer housing 103, and accommodates the motion conversion mechanism 120 and the striking element 140 therein. The electric motor 110 for driving the motion conversion mechanism 120 is accommodated in the lower rear portion of the outer housing 103 so as to be positioned below the motion conversion mechanism 120.

  The rotation output of the electric motor 110 is appropriately converted into a linear motion by the motion conversion mechanism 120 and then transmitted to the striking element 140, and the major axis direction of the hammer bit 119 (the left-right direction in FIG. 1) via the striking element 140. Generates an impact force on. The hand grip 107 is provided with an electric switch 107a and a slide-type operation member 107b capable of switching on / off of the electric switch 107a. The electric motor 110 is energized when the electric switch 107a is turned on. The electric motor 110 corresponds to the “motor” in the present invention, and the motion conversion mechanism 120 and the striking element 140 correspond to the “drive mechanism” in the present invention.

  As shown in FIG. 1, the motion conversion mechanism 120 includes a crankshaft 125 that is rotationally driven in a horizontal plane, an eccentric shaft 127 provided at a position shifted from the rotation center of the crankshaft 125 (an eccentric position), and a piston 131. The crank mechanism is composed of a connecting rod 129 that connects the piston 131 and the eccentric shaft 127. The crankshaft 125 is formed separately from the motor shaft 113 of the electric motor 110, and is disposed coaxially with the motor shaft 113 so as to rotate integrally therewith. The crankshaft 125 is disposed above the motor shaft 113 and is rotatably supported by the inner housing 104 via a bearing (ball bearing) 126. The motion conversion mechanism 120 corresponds to the “crank mechanism that drives the striking mechanism” in the present invention, and the crankshaft 125 corresponds to the “rotary shaft of the crank mechanism” in the present invention.

  The rotational motion of the crankshaft 125 is converted into a linear motion via the eccentric shaft 127 and the connecting rod 129 and transmitted to the piston 131. The piston 131 is provided as a driver for driving the striking element 140 and is slid linearly in the cylinder 141 in the same direction as the long axis direction of the hammer bit 119. The cylinder 141 is disposed concentrically behind the tool holder 159 that holds the hammer bit 119, and is housed and fixed in the inner housing 104 together with the tool holder 159.

  As shown in FIG. 1, the striking element 140 includes a striker 143 as a striking element slidably disposed on the bore inner wall of the cylinder 141, a slidable arrangement in the tool holder 159, and the striker 143. It is mainly composed of an impact bolt 145 as an intermediate that transmits operating energy (blowing force) to the hammer bit 119. The striker 143 is driven via an air spring in the air chamber 141a of the cylinder 141 in accordance with the sliding motion of the piston 131, and collides with (impacts) an impact bolt 145 disposed in the tool holder 159. The hammering force 119 is transmitted to the hammer bit 119. This striking element 140 corresponds to the “striking mechanism” in the present invention.

  The structure of the electric motor 110 is shown in FIGS. The electric motor 110 according to the present embodiment is a direct current brushless motor, and is configured as an outer rotor type motor in which a stator 111 is disposed inside and a rotor 112 is disposed outside as shown in FIGS. Has been. The electric motor 110 is arranged such that the major axis direction of the motor shaft 113 intersects the major axis direction of the hammer bit 119 (and hence the major axis direction of the main body 101) in a perpendicular manner.

  The stator 111 includes a coil holding member 111b that holds a drive coil 111a for driving the rotor 112, and a cylindrical mounting member 111c that is disposed inside the coil holding member 111b to support the coil holding member 111b. Is the main constituent. The cylindrical mounting member 111 c has a flange portion on the upper end side, and this flange portion is supported in a fixed manner by the inner housing 104. In addition, the inner housing 104 accommodates the motion conversion mechanism 120 and the striking element 140 disposed inside the outer housing 103 as shown in FIG.

  The rotor 112 is concentrically attached to the motor shaft 113 and is formed as a bottomed substantially cylindrical member whose one end (lower end) in the axial direction is closed. As shown in FIG. 5, magnets 115 are attached to the inner surface of the side wall 112a of the rotor 112 at a predetermined interval in the circumferential direction so as to face the outer periphery of the stator 111. As shown in FIGS. One end portion (lower end portion) of the motor shaft 113 in the axial direction is press-fitted and integrated with the boss portion at the center of the bottom plate 112b constituting the bottom shape.

  As shown in FIGS. 4 and 7, the motor shaft 113 is disposed so as to pass through the inside of the cylindrical mounting member 111 c of the stator 111 in a loosely fitting manner. The lower side of the motor shaft 113 penetrates the bottom plate 112b of the rotor 112 and extends downward, and its extended end is rotatably supported by the outer housing 103 via a bearing (ball bearing) 117. Has been. The upper side of the motor shaft 113 extends through the inner housing 104 to the inner space side of the inner housing 104. The motor shaft 113 corresponds to the “rotary shaft to which the rotor is attached” and the “rotary shaft of the motor” in the present invention.

  During processing by the electric hammer 100, the electric motor 110, the motion conversion mechanism 120, and the striking element 140 are driven to generate heat. Therefore, the electric motor 110 includes a cooling fan 160 in order to release heat generated in the electric motor 110, the motion conversion mechanism 120, and the striking element 140 to the outside of the main body 103.

  In the present embodiment, as shown in FIG. 5, a plurality of slits (pores) 161 that are inclined at a predetermined angle with respect to the radial straight line are formed at a predetermined interval in the circumferential direction on the side wall 112a of the rotor 112. A fan blade shape is formed by the slits 161 and adjacent (opposite) portions 163 across the slits 161, and from the inside of the rotor 112 due to centrifugal force generated when the rotor 112 rotates. It is set as the structure which generates the air flow (cooling wind) which goes outside. That is, in this embodiment, a centrifugal cooling fan 160 is set on the rotor 112 itself by forming a fan blade shape on the side wall 112a of the rotor 112. The shape of the side wall 112a having the slit 161 corresponds to the “blade shape for generating cooling air” in the present invention, and the slit 161 corresponds to the “vent hole” in the present invention.

  The slit 161 is formed in a region of the side wall 112a of the rotor 112 where the magnet 115 is not attached, and is formed over substantially the entire length of the rotor 112 in the axial direction as shown in FIG. . Further, the inclination direction of the slit 161 is set so that the outer surface opening side of the side wall 112a is the rear side of the rotation direction of the rotor 112 (the direction of the arrow R in FIG. 5). A flow can be generated.

  As shown in FIG. 6, a plurality of substantially trapezoidal through holes 165 are formed in the bottom plate 112 b of the rotor 112 in the circumferential direction at a predetermined interval in a plan view for intake through the axial direction. The inner side and the outer side of the rotor 112 are communicated. The bottom plate 112b corresponds to the “end face connected to the rotating shaft” in the present invention, and the through hole 165 corresponds to the “first opening” in the present invention.

  The outer housing 103 is formed with a wind window 167 for taking in external air on a surface opposite to one end of the electric motor 110 in the axial direction, that is, a lower surface (region). The lower surface of the outer housing 103 corresponds to the “end surface” in the present invention, and the wind window 167 corresponds to the “second opening” in the present invention. As shown in FIG. 3, the air window 167 is configured as a plurality of rows of lattice windows extending intermittently in the circumferential direction, and faces the bottom plate 112b of the rotor 112 in which the through holes 165 are formed.

  As shown in FIGS. 1, 2, and 7, the electric motor 110 and the drive mechanism (motion conversion mechanism) are provided in the upper and side regions of the connecting rod 129 among the upper surface and the left and right side surface upper portions of the outer housing 103. 120, a plurality of slit-like exhaust ports 169 for discharging the cooling air used for cooling the striking element 140) to the outside of the electric hammer 100 are formed.

  As shown in FIGS. 4 and 7, a skirt-like cylindrical portion 111d that protrudes downward at a predetermined length is formed on the flange portion of the cylindrical mounting member 111c of the stator 111, and the cylindrical portion The opening end portion 111d is arranged so as to cover the outer periphery of the stepped small diameter portion formed at the cylindrical opening end portion of the rotor 112 with a slight gap. Thereby, the air in the outer housing 103 is prevented from flowing into the rotor 112 from above the rotor 112.

  In the electric hammer 100 configured as described above, when the electric motor 110 is energized and driven by operating the operation member 107b and switching the electric switch 107a to the on state, the electric hammer 110 is moved from the motion conversion mechanism 120 via the striking element 140. A hammering force in the major axis direction is applied to the hammer bit 119. As a result, the hammer bit 119 performs a hammering operation in the long axis direction and performs a machining operation on the workpiece (concrete).

  When the rotor 112 of the electric motor 110 rotates, an air flow (cooling air) from the inside to the outside of the rotor 112 is generated through the slit 161 of the side wall 112a due to the centrifugal force generated by the rotation of the rotor 112. As a result, air outside the electric hammer 100 flows into the outer housing 103 from the wind window 167 of the outer housing 103. The air that flows into the outer housing 103, that is, the cooling air, flows into the electric motor 110 through the through hole 165 of the bottom plate 112 b of the rotor 112, and gaps between the constituent members that constitute the electric motor 110, and It flows between the rotor 112 and the stator 111 and flows upward or obliquely upward, and flows to the outside of the rotor 112 through the slit 161 of the side wall 112a of the rotor 112. The cooling air that has flowed out of the rotor 112 further flows upward through the space between the outer housing 103 and the inner housing 104, and then flows from the exhaust port 169 of the outer housing 103 to the outside of the electric hammer 100. Discharged. Then, the heat generated in the motion conversion mechanism 120 and the striking element 140, which are drive mechanisms, is discharged to the outside of the electric hammer 100 when flowing out between the two housings 103. In FIG. 1, FIG. 2, FIG. 4, and FIG.

  Thus, according to the present embodiment, the heat generated in the electric motor 110 and the heat generated in the motion conversion mechanism 120 and the striking element 140 are released to the outside of the electric hammer 100, whereby the electric motor 110, the motion The conversion mechanism 120 and the striking element 140 can be efficiently cooled.

  By the way, when the separately formed cooling fan is arranged in series in the axial direction of the rotor and attached to rotate integrally with the rotor, the axial dimension of the electric motor 110 with respect to the electric hammer 100 ( The dimension H) in FIG. 1, that is, the total height of the electric hammer 100 increases, and the center of gravity of the electric hammer 100 moves away from the striking axis (long axis of the hammer bit 119). However, according to the present embodiment, the fan blade shape formed by the slit 161 formed on the side wall 112a of the rotor 112 of the electric motor 110 and the portion 163 adjacent to the slit 161 is formed. The overall height of the electric hammer 100 can be lowered to reduce the size, and the assembling work becomes unnecessary. Further, it becomes possible to bring the center of gravity of the electric hammer 100 closer to the hitting axis, thereby reducing the moment generated around the center of gravity during the hammering operation, thereby improving usability.

  Further, in the present embodiment, the fan blade shape of the fan 112 is formed over substantially the entire axial direction of the side wall 112a of the rotor 112, and cooling air can be generated by utilizing a wide surface, so that the air blowing capacity can be easily secured. Can do. Further, the motor shaft 113 of the electric motor 110 and the crankshaft 125 of the motion conversion mechanism (crank mechanism) 120 are coaxially arranged and connected. For this reason, the electric motor 110 and the motion conversion mechanism 120 can be disposed close to each other in the axial direction as much as another power transmission member is not interposed between the two shafts. As a result, the overall height of the electric hammer 100 can be further shortened.

  Further, according to the present embodiment, the electric motor 110 is configured by the outer rotor type motor in which the rotor 112 is disposed outside the stator 111. By adopting the outer rotor type motor, the outer diameter of the rotor 112 can be increased and a large rotor inertia moment can be provided. For this reason, compared with an inner rotor type motor, a big torque can be generated. If the electric motor is an inner rotor type motor, a speed reduction mechanism must be provided between the motor shaft 113 and the crankshaft 125 to secure the torque necessary to generate a predetermined striking force, and the weight May increase, or the size of the aircraft may increase. However, according to the present embodiment, since the electric motor 110 is constituted by the outer rotor type motor, the speed reduction mechanism is not required. For this reason, the electric hammer 100 can be reduced in weight and size, thereby improving the operability of the electric hammer 100 when performing a machining operation. In addition, when the output of the electric motor 110 is constant, the number of rotations can be reduced, so that vibration of the electric hammer 100 due to motor vibration can be reduced.

  In the present embodiment, the air window 167 of the outer housing 103 is used for intake from the outside of the outer housing 103 to the inside, but may be changed to exhaust. That is, the exhaust port 169 formed in the upper surface of the outer housing 103 and the upper portions of the left and right side surfaces may be configured as an intake air window so that the flow direction of the cooling air is reversed.

  Next, a modification according to the present embodiment will be described with reference to FIG. In this modification, a slit 171 serving as an air inlet that is inclined at a predetermined angle with respect to the axial direction of the rotor 112 and a portion 173 adjacent (opposing) with the slit 171 sandwiched between the slit 171 and the bottom plate 112b of the rotor 112. The fan blade shape is formed by the rotation of the rotor 112, whereby the air flow (cooling) indicated by the indicated arrow lines from the outside of the electric motor 110 (the lower surface side of the bottom plate 112 b) to the inside (the upper surface side of the bottom plate 112 b) by rotation of the rotor 112 Wind) is generated. That is, in the modification, an axial cooling fan is set on the rotor 112 itself by forming a fan blade shape on the bottom plate 112b of the rotor 112. The shape of the bottom plate 112b having the slit 171 corresponds to the “blade shape for generating cooling air” in the present invention, and the slit 171 corresponds to the “vent hole” in the present invention. The inclination of the slit 171 is set so that the inner surface side of the bottom plate 112b is the rear side of the rotation direction of the rotor 112 (R arrow direction in FIG. 8). Thereby, the air flow which flows into the inside from the exterior of the electric motor 110 can be generated.

  According to this modified example, the fan blade shape that generates the axial flow is formed on the bottom plate 112b of the rotor 112, so that the cooling air is axially transmitted from the outside to the inside of the rotor 112 in the electric motor 110. The electric motor 110 can be cooled by flowing.

  The modification can be implemented in a mode used in combination with the first embodiment in which the fan blade shape is formed on the side wall 112a of the rotor 112, or can be implemented alone. For example, when implemented alone, the upper space of the rotor 112 is opened so as to face the space between the outer housing 103 and the inner housing 104. As a result, the cooling air that has flowed into the rotor 112 through the slit 171 of the bottom plate 112 b flows from the upper opening of the rotor 112 to between the outer housing 103 and the inner housing 104, and the motion conversion mechanism 120 and the striking element 140. Can be cooled.

  In the modification, the cooling air is circulated from the outside to the inside of the rotor 112 through the slit 171 of the bottom plate 112b. However, the cooling air may be circulated from the inside to the outside.

  Moreover, although embodiment which included the modification mentioned above was set as the structure which cools the motion conversion mechanism 120 and the striking element 140 with the cooling air after cooling the electric motor 110, after cooling the electric motor 110, it discharges | emits outside. You can change the configuration. The “blade shape” formed on the rotor 112 so as to generate cooling air may be configured to be a part of the rotor 112. Moreover, although the case of the electric hammer 100 has been described as an example of the electric tool, not only the electric hammer but also the hammer bit 119 can be applied to a hammer drill that rotates around an axis in addition to a striking operation. It may be applied to power tools other than impact tools.

(Correspondence between each component of the embodiment and the component of the present invention)
The relationship between each component in this Embodiment and the invention specific matter of the component in this invention is as follows. Of course, each component in the present embodiment is only one example of the configuration related to the specific matters of the present invention, and each component of the present invention is not limited to this.
The hammer bit 119 is an example of a configuration corresponding to the “tip tool” of the present invention.
The electric motor 110 is an example of a configuration corresponding to the “motor” of the present invention.
The motor shaft 113 is an example of a configuration corresponding to the “rotary shaft to which the rotor is attached” of the present invention.
The shape of the side wall 112a having the slit 161 is an example of a configuration corresponding to the “blade shape” of the present invention.
The slit 161 is an example of a configuration corresponding to the “vent hole” in the present invention.
The outer housing 103 is an example of a configuration corresponding to the “housing” of the present invention.
The lower surface of the outer housing 103 is an example of a configuration corresponding to the “end surface” of the present invention.
The wind window 167 is an example of a configuration corresponding to the “second opening” of the present invention.
The bottom plate 112b of the rotor 112 is an example of a configuration corresponding to the “end face” of the present invention.
The through hole 165 is an example of a configuration corresponding to the “first opening” of the present invention.
The motion conversion mechanism 120 and the striking element 140 are an example of a configuration corresponding to the “drive mechanism” of the present invention.
The motion conversion mechanism 120 is an example of a configuration corresponding to the “crank mechanism” of the present invention.
The striking element 140 is an example of a configuration corresponding to the “striking mechanism” of the present invention.
The crankshaft 125 is an example of a configuration corresponding to the “rotary shaft of the crank mechanism” of the present invention.
The shape of the bottom plate 112b having the slit 171 corresponds to the “blade shape” in the present invention.
The slit 171 is an example of a configuration corresponding to the “vent hole” in the present invention.

100 Electric hammer (Electric tool)
101 Body 103 Outer housing (housing)
104 Inner housing 107 Hand grip 107a Electric switch 107b Operation member 110 Electric motor (motor)
111 Stator (stator)
111a Drive coil 111b Coil holding member 111c Cylindrical mounting member 111d Cylindrical part 112 Rotor (rotor)
112a Side wall (side)
112b Bottom plate (end face)
113 Motor shaft (motor rotation shaft)
115 Magnet 117 Bearing 119 Hammer Bit (Tip Tool)
120 Motion conversion mechanism (drive mechanism, crank mechanism)
125 Crankshaft 126 Bearing 127 Eccentric shaft 129 Connecting rod 131 Piston 140 Impact element (drive mechanism, impact mechanism)
141 Cylinder 141a Air chamber 143 Strike 145 Impact bolt 159 Tool holder 160 Cooling fan 161 Slit (ventilation opening)
163 Opposing portion 165 Through hole (first opening)
167 Wind window (second opening)
169 Exhaust port 171 Slit (vent)
173 Opposing parts

Claims (8)

An electric tool provided with a motor for driving a tip tool,
The motor is configured as an outer rotor type motor having a stator, a rotor, and a rotating shaft to which the rotor is attached, and the rotor disposed outside the stator,
The electric tool according to claim 1, wherein the rotor is formed in a blade shape for generating cooling air used for cooling the motor. The electric tool according to claim 1,
The motor is characterized in that a first opening for communicating the inside and the outside of the motor is formed at an end in the motor axial direction. The electric tool according to claim 1 or 2,
A power tool comprising a housing that houses the motor, wherein a second opening that communicates the inside and the outside of the housing is formed on a surface of an end portion of the housing in the motor axial direction. The electric tool according to any one of claims 1 to 3,
The rotor has an end surface that extends in a direction intersecting the axial direction of the rotor and is connected to the rotation shaft, and a vent is formed in the end surface, and the rotation including the vent An electric tool characterized in that an end face of a child is formed in a blade shape. The electric tool according to any one of claims 1 to 4,
The rotor has a vent hole that communicates the inside and the outside of the rotor, and the side surface of the rotor including the vent hole is formed in a blade shape. tool. Having a drive mechanism driven by the motor to drive the tip tool;
An electric tool characterized in that cooling air that has cooled the motor passes through the drive mechanism, thereby cooling the drive mechanism. The electric tool according to claim 6,
The tip tool is configured as a hammer bit that performs work by applying a linear impact force to the workpiece,
The electric power tool according to claim 1, wherein the driving mechanism has a striking mechanism for striking at least the hammer bit in a major axis direction. The electric tool according to claim 7,
The drive mechanism has a crank mechanism that converts the rotational motion of the motor into a linear motion to drive the striking mechanism,
The motor is arranged such that the rotation shaft of the motor intersects the striking axis of the striking mechanism, and the rotation shaft of the motor and the rotation shaft of the crank mechanism are arranged coaxially. Electric tool to do.

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