JP6936038B2 - Electric tool - Google Patents

Description

The present invention relates to a portable electric work machine, and more particularly to an electric tool configured to perform work by driving a tip tool with respect to a predetermined drive shaft.

There is known a portable electric work machine that performs work by driving a tip tool using a rechargeable battery as a power source. As an example of such an electric working machine, there is an electric striking tool configured to drive a tip tool linearly in the striking axis direction using a motor as a drive source. For example, Patent Document 1 discloses a hammer drill including a brushless motor powered by a battery and a hammer drill including an AC commutator motor.

Japanese Unexamined Patent Publication No. 2016-22567

In the above hammer drill, the motor is arranged in the housing so that the output shaft of the motor extends in the direction (vertical direction) intersecting the striking shaft. In a hammer drill having such a motor arrangement, the arrangement of other components is likely to be restricted because the motor arrangement area is relatively large in the vertical direction.

The present invention is a technique that contributes to rationalization of the structure of an electric work machine, particularly, in an electric tool configured to perform work by driving a tip tool with respect to a predetermined drive shaft, to make the arrangement area of a motor compact. The challenge is to provide contributing technology.

According to one aspect of the present invention, there is provided a power tool configured to perform work by driving a tip tool with respect to a predetermined drive shaft. This power tool includes a motor, a drive mechanism, and a housing.

The motor includes a motor body and a motor shaft. The motor body includes a stator and a rotor. The motor shaft extends from the rotor. The drive mechanism is configured to drive the tip tool by the power of the motor. The housing houses the motor and drive mechanism. Further, the motor is arranged so that the motor main body portion is separated from the drive shaft and the rotation shaft of the motor shaft extends in a direction intersecting the drive shaft. Further, the motor is configured as a brushless motor in which the ratio of the product thickness to the diameter of the stator is set to 1/5 or less and the diameter of the rotor is set to be larger than the product thickness.

A brushless motor in which the ratio of the product thickness to the diameter of the stator is set to 1/5 or less and the diameter of the rotor is set to be larger than the product thickness is also called a flat motor, and has a diameter as compared with a normal motor. The size in the extending direction of the rotation shaft of the motor shaft is set smaller than the size in the direction. According to this aspect, by adopting such a brushless motor, it is possible to reduce the arrangement area of the motor with respect to the extending direction of the rotating shaft, and by extension, the electric tool can be miniaturized. Alternatively, it is possible to arrange other components with respect to the extending direction of the rotating shaft without increasing the size of the entire power tool.

The "power tool" referred to here is an electric tool used for machining, and it is sufficient that the work can be performed by driving the tip tool with respect to a predetermined drive shaft. For example, the power tool may be capable of linearly driving the tip tool in a predetermined drive axis direction, or may be capable of rotationally driving the tip tool around a predetermined drive axis. However, both of these operations may be possible.

According to one aspect of the present invention, the power tool may be a striking tool configured to drive the tip tool linearly in the drive axis direction. The drive mechanism has a striking element configured to drive the tip tool linearly in the drive axis direction by colliding with the tip tool, and a striking element that converts the rotational motion of the motor into a linear motion and transmits it to the striking element. It may include a configured motion conversion mechanism. The motion conversion mechanism may be configured as a crank mechanism. A drive mechanism that employs a crank mechanism as a motion conversion mechanism tends to be larger than a drive mechanism that employs a swing member. According to this aspect, even if the crank mechanism is adopted, the motor is configured as a brushless motor in which the ratio of the product thickness to the diameter of the stator is set to 1/5 or less and the diameter of the rotor is larger than the product thickness. Therefore, it is possible to prevent the entire power tool configured as the striking tool from becoming large.

According to one aspect of the present invention, the power tool is configured so that any one of a plurality of operation modes can be selected according to an external operation and operates according to the selected operation mode. It may have been done. According to this aspect, the user can select the operation mode according to the desired machining operation and use the power tool. When the power tool is configured as a striking tool, typical examples of a plurality of operation modes are a hammer mode in which only the operation of driving the tip tool linearly in the drive axis direction (so-called striking operation) is performed. An example is a drill mode in which at least the operation of rotationally driving the tip tool around the drive axis (so-called drill operation) is performed. The term "drill mode" as used herein means to include any of an operation mode in which only a drill operation is performed, an operation mode in which a drill operation and a striking operation are performed, and an operation mode in which an operation other than the striking operation is performed in addition to the drill operation. Is.

According to one aspect of the invention, the power tool may further include a fan rotated by a motor and a controller configured to control the operation of the power tool. The fan may be configured to flow in through a vent formed in the housing, pass around the controller, and then form a flow of cooling air that passes around the motor. According to this aspect, the controller and the motor that require cooling can be efficiently cooled by forming the flow of the cooling air by the fan.

According to one aspect of the present invention, the controller may be configured as a control device for a brushless motor. The control device for a brushless motor is generally configured to include a control circuit and an inverter circuit, and there is a high demand for cooling. According to this aspect, the control device of the brushless motor can be effectively cooled.

According to one aspect of the present invention, the power tool may further include a grip portion configured to be grippable by an operator. The housing portion may include a first housing portion that houses the motor and drive mechanism. Then, the grip portion may be connected to the first housing portion via an elastic element so as to be relatively movable. According to this aspect, it is possible to suppress the transmission of vibration from the first housing portion in which the motor and the drive mechanism serving as the vibration source are housed to the grip portion gripped by the operator.

According to one aspect of the present invention, the housing may include a second housing portion that is movably connected to the first housing portion via an elastic element. The second housing portion may have a grip portion. According to such an aspect, the grip portion can be rationally arranged in the so-called vibration-proof housing including the first housing portion and the second housing portion elastically connected to the first housing portion.

According to one aspect of the invention, the power tool may further include a controller configured to control the operation of the power tool. Then, the second housing portion may have a battery mounting portion configured to accommodate the controller and to attach / detach the battery. According to this aspect, it is possible to suppress the transmission of vibration from the first housing portion in which the motor and the drive mechanism serving as the vibration source are housed to the second housing portion in which the controller is housed, so that the controller is protected from vibration. can do. Further, by providing the battery mounting portion in the second housing, chattering can be prevented and wiring between the battery mounting portion and the controller can be facilitated.

According to one aspect of the present invention, the electric tool is provided in the second housing portion and is configured to irradiate light toward the working position by the tip tool, and works for energizing the motor. It may further include an operating member configured to be externally operated by a person. Then, the lighting device may be configured to be turned on prior to the energization drive of the motor in conjunction with the external operation of the operating member. According to this aspect, the illuminating device can be protected from vibration by providing the illuminating device in the second housing portion connected to the first housing portion via the elastic element. Further, since the lights are turned on before the energization drive of the motor is started in conjunction with the operation of the operating member, the operator can turn on the lighting device only by operating one operating member. , The work position with the tip tool can be easily confirmed even before the actual work is started.

According to one aspect of the present invention, the power tool may include a plurality of battery mounting portions.

It is a perspective view which shows the appearance of a hammer drill. It is a vertical cross-sectional view of the hammer drill in the initial state. It is an enlarged view of the motor accommodating part of FIG. 2 and the peripheral part thereof. It is explanatory drawing which shows the internal structure of the hammer drill with a part of the housing removed from the rear view. It is the bottom view of the motor accommodating part. FIG. 3 is a cross-sectional view taken along the line VI-VI of FIG. It is a vertical cross section of a hammer drill in a state where the second housing is moved forward with respect to the first housing. It is a vertical sectional view of the hammer drill of another embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiment, as an example of the electric tool, the electric hammer drill 1 which is a striking tool will be illustrated.

<First Embodiment>
Hereinafter, the hammer drill 1 according to the first embodiment will be described with reference to FIGS. 1 to 7. The hammer drill 1 of the present embodiment has an operation of driving the tip tool 18 mounted on the tool holder 34 linearly along a predetermined striking shaft A1 (striking operation) and a rotational driving of the tip tool 18 around the striking shaft A1. It is configured to perform an action (drilling action).

First, a schematic configuration of the hammer drill 1 will be described with reference to FIGS. 1 and 2. The outer shell of the hammer drill 1 is mainly formed by the housing 10. The housing 10 of the present embodiment is configured as a so-called anti-vibration housing, and includes a first housing portion 11 and a second housing portion 13 elastically connected to the first housing portion 11 so as to be movable relative to the first housing portion 11.

As shown in FIG. 2, the first housing portion 11 accommodates a motor accommodating portion 111 accommodating a motor 2 and a drive mechanism accommodating a drive mechanism 3 configured to drive the tip tool 18 by the power of the motor 2. It is formed in a substantially L shape as a whole, including the portion 117. The drive mechanism accommodating portion 117 is formed in a long shape extending in the striking shaft A1 direction. A tool holder 34 is provided at one end of the drive mechanism accommodating portion 117 in the striking shaft A1 direction so that the tip tool 18 can be attached and detached. The motor accommodating portion 111 is connected and fixed so as not to be relatively movable with respect to the drive mechanism accommodating portion 117 at the other end portion of the drive mechanism accommodating portion 117 in the striking shaft A1 direction, intersects the striking shaft A1, and is striking shaft. It is arranged so as to protrude in the direction away from A1. In the motor accommodating portion 111, the motor 2 is arranged so that the rotation shaft A2 of the motor shaft 25 extends in the direction orthogonal to the striking shaft A1.

In the following description, for convenience, the striking axis A1 direction of the hammer drill 1 is defined as the front-rear direction of the hammer drill 1, and one end side on which the tool holder 34 is provided is referred to as the front side (also referred to as the tip region side) of the hammer drill 1. Prescribe. Further, the extending direction of the rotation shaft A2 of the motor shaft 25 is defined as the vertical direction of the hammer drill 1, and the direction in which the motor accommodating portion 111 protrudes from the drive mechanism accommodating portion 117 is defined as the downward direction.

The second housing portion 13 includes a grip portion 131, an upper portion 133, and a lower portion 135, and is formed in a substantially U shape as a whole. The grip portion 131 is a portion that is configured to be grippable by an operator and is arranged so as to extend in the rotation axis A2 direction (that is, the vertical direction) of the motor shaft 25. More specifically, the grip portion 131 extends in the vertical direction so as to be separated rearward from the first housing portion 11. The upper portion 133 is a portion connected to the upper end portion of the grip portion 131. In the present embodiment, the upper portion 133 extends forward from the upper end portion of the grip portion 131 and is configured to cover most of the drive mechanism accommodating portion 117 of the first housing portion 11. The lower portion 135 is a portion connected to the lower end portion of the grip portion 131. In the present embodiment, the lower portion 135 extends forward from the lower end portion of the grip portion 131 and is arranged below the motor accommodating portion 111.

With the above configuration, as shown in FIG. 1, in the hammer drill 1, in addition to the second housing portion 13, the motor accommodating portion 111 of the first housing portion 11 is sandwiched between the upper portion 133 and the lower portion 135 from above and below. The housing is exposed to the outside to form the outer surface of the hammer drill 1. Further, the second housing portion 13 is connected to the first housing portion 11 via an elastic element. Further, the upper portion 133 and the lower portion 135 are configured to be slidable with respect to the upper end portion and the lower end portion of the motor accommodating portion 111, respectively. With such a configuration, the housing 10 functions as a vibration-proof housing. This point will be described in detail later.

At the lower end of the lower portion 135, two battery mounting portions 15 are provided so that the rechargeable battery 19 can be attached and detached. In the present embodiment, the two battery mounting portions 15 are arranged side by side in the front-rear direction. In the present embodiment, the hammer drill 1 operates by the electric power supplied from the two batteries 19 mounted on the battery mounting portion 15.

Hereinafter, the detailed configuration of each part of the hammer drill 1 will be described with reference to FIGS. 1 to 6.

First, the internal structure of the motor accommodating portion 111 will be described with reference to FIG. The motor accommodating portion 111 is formed in a bottomed rectangular cylinder with an open upper side. As shown in FIG. 3, the drive mechanism accommodating portion 117 is connected and fixed so as not to be relatively movable with respect to the motor accommodating portion 111 in a state where the lower end portion of the rear side portion is arranged in the upper end portion of the motor accommodating portion 111. ing. In the present embodiment, the motor accommodating portion 111 accommodates a small, high-output brushless motor as the motor 2. The motor 2 includes a motor main body 20 including a stator 21 and a rotor 22, and a motor shaft 25 extending from the rotor 22 and rotating together with the rotor 22. In the present embodiment, the motor main body 20 is arranged at the lower end of the motor accommodating portion 111, away from the striking shaft A1. In this embodiment, the ratio of the product thickness to the diameter of the stator 21 is set to 1/5 or less, and the diameter of the rotor 22 is set to be larger than the product thickness. That is, the motor 2 is configured as a motor (so-called flat motor) having a relatively small thickness in the rotation axis A2 direction with respect to the diameter. As a result, the length of the motor accommodating portion 111 in the rotation axis A2 direction is suppressed. With such a configuration, even if the lower portion 135 is arranged below the motor accommodating portion 111, and even if the battery 19 is mounted below the lower portion 135, the entire hammer drill 1 becomes large. It can be suppressed.

The motor shaft 25 extending in the vertical direction is rotatably supported by a bearing 26 held at the lower end of the drive mechanism accommodating portion 117 and a bearing 27 held at the lower end of the motor accommodating portion 111. A fan 28 for cooling the motor 2 and the controller 5, which will be described later, is fixed to the motor shaft 25 adjacent to the upper side of the motor main body 20. The fan 28 rotates integrally with the motor shaft 25 by being driven by the motor 2, so that the fan 28 flows into the housing 10 from the vent 139 (see FIG. 2) described later, passes around the controller 5, and then the motor 2 It is configured to form a flow of cooling air that passes around the. After passing around the motor 2, the cooling air flows out to the outside of the housing 10 from a ventilation port 134 (see FIG. 1) provided as an exhaust port on the side surface of the upper portion 133. The upper end portion of the motor shaft 25 projects into the drive mechanism accommodating portion 117, and the drive gear 29 is formed in this portion.

Next, the internal structure of the drive mechanism accommodating portion 117 will be described with reference to FIG. As described above, the drive mechanism 3 is housed in the drive mechanism accommodating portion 117. As shown in FIG. 2, the drive mechanism 3 of the present embodiment includes a motion conversion mechanism 30, a striking element 36, and a rotation transmission mechanism 38.

The motion conversion mechanism 30 is configured to convert the rotational motion of the motor 2 into a linear motion and transmit it to the striking element 36. The motion conversion mechanism 30 of the present embodiment is configured as a crank mechanism, and includes a crankshaft 31, a connecting rod 32, a piston 33, and a cylinder 35. The crankshaft 31 is arranged at the rear end of the drive mechanism accommodating portion 117 in parallel with the motor shaft 25. The crankshaft 31 has a driven gear 311 that meshes with the drive gear 29 at the lower end and a crank pin 312 at the upper end. One end of the connecting rod 32 is rotatably connected to the crankpin 312, and the other end is attached to the piston 33 via the pin. The piston 33 is slidably arranged in the cylindrical cylinder 35. The cylinder 35 is coaxially connected and fixed to the rear portion of the tool holder 34 arranged in the tip region of the drive mechanism accommodating portion 117. When the motor 2 is driven, the piston 33 is reciprocated in the cylinder 35 in the striking shaft A1 direction.

The striking element 36 includes a striker 361 and an impact bolt 363. The striker 361 is slidably arranged in the cylinder 35 in the striking shaft A1 direction. An air chamber 365 for linearly moving the striker 361 as a striking element is formed between the striker 361 and the piston 33 via a pressure fluctuation of air generated by the reciprocating movement of the piston 33. The impact bolt 363 is configured as a meson that transmits the kinetic energy of the striker 361 to the tip tool 18, and is slidably arranged in the tool holder 34 in the striking shaft A1 direction.

When the motor 2 is driven and the piston 33 is moved forward, the air in the air chamber 365 is compressed and the internal pressure rises. Therefore, the striker 361 is pushed forward at high speed and collides with the impact bolt 363, and kinetic energy is transmitted to the tip tool 18. As a result, the tip tool 18 is driven linearly along the striking shaft A1 to strike the workpiece. On the other hand, when the piston 33 is moved rearward, the air in the air chamber 365 expands, the internal pressure decreases, and the striker 361 is pulled in rearward. The hammer drill 1 performs a striking motion by causing the motion conversion mechanism 30 and the striking element 36 to repeat such an motion.

The rotation transmission mechanism 38 is configured to transmit the rotational power of the motor shaft 25 to the tool holder 34. In the present embodiment, the rotation transmission mechanism 38 is configured as a gear reduction mechanism including a plurality of gears, and the rotation power of the motor 2 is appropriately decelerated and then transmitted to the tool holder 34. A meshing type clutch 39 is arranged on the power transmission path of the rotation transmission mechanism 38. When the clutch 39 is placed in the engaged state, the rotational power of the motor shaft 25 is transmitted to the tool holder 34 by the rotation transmission mechanism 38, and the tip tool 18 mounted on the tool holder 34 rotates around the striking shaft A1. Driven. On the other hand, when the clutch 39 is disengaged (FIG. 2 shows the disengaged state), the power transmission to the tool holder 34 by the rotation transmission mechanism 38 is cut off, and the tip tool 18 rotates. Not driven.

The hammer drill 1 of the present embodiment is configured so that one of two modes, a hammer drill mode and a hammer mode, can be selected by operating the mode switching dial 391 provided on the upper portion of the drive mechanism accommodating portion 117. The hammer drill mode is a mode in which the striking operation and the drilling operation are performed by engaging the clutch 39 and driving the motion conversion mechanism 30 and the rotation transmission mechanism 38. The hammer mode is a mode in which only the striking motion is performed by disengaging the clutch 39 and driving only the motion conversion mechanism 30. Since the configuration for such mode switching is a well-known technique, the description thereof is omitted here.

Hereinafter, the internal structure of the second housing portion 13 will be described with reference to FIGS. 1, 2 and 4. First, the upper portion 133 will be described. As shown in FIGS. 1 and 2, the rear portion of the upper portion 133 is formed in a substantially rectangular box shape with the lower side open, and the rear portion of the drive mechanism accommodating portion 117 (more specifically, motion conversion). The portion in which the mechanism 30 and the rotation transmission mechanism 38 are housed) is covered from above. Further, the front side portion of the upper side portion 133 is formed in a cylindrical shape and covers the outer periphery of the front side portion (more specifically, the portion in which the tool holder 34 is housed) of the drive mechanism housing part 117.

The grip portion 131 will be described. As shown in FIG. 2, a trigger 14 that can be pressed by an operator is provided on the front portion of the grip portion 131. Inside the cylindrical grip portion 131, a switch unit 140 that can be switched between an on state and an off state according to the operation of the trigger 14 is provided. Although not shown in detail because it has a known configuration, the switch unit 140 includes a plunger that is moved in conjunction with the pressing operation of the trigger 14, a motor switch, and a lighting switch.

Each switch has a fixed contact and a movable contact. Each switch is maintained in the off (open) state in the initial state when the trigger 14 is not pressed. On the other hand, when the trigger 14 is pressed, the plunger moves in conjunction with the pressing operation, and the movable contact is brought into contact with the fixed contact, so that the switch is turned on (closed). In the present embodiment, the movable contact of the lighting switch contacts the fixed contact before the trigger 14 is pressed to the maximum, and when the trigger 14 is pressed to the maximum, the movable contact of the motor switch is pressed. The operating timing of each switch contact by the plunger is set so that it contacts the fixed contact.

The switch unit 140 is electrically connected to the controller 5 described later by a wiring (not shown). The on and off states of the motor switch and the lighting switch are used for starting and stopping the energization of the motor 2 by the controller 5, and for controlling the lighting and extinguishing of the lighting unit 6, which will be described later.

The lower portion 135 will be described. As shown in FIGS. 1 and 2, the lower portion 135 is formed in a rectangular box shape with a partially open upper side, and is arranged below the motor accommodating portion 111. As described above, two battery mounting portions 15 are provided side by side in the front-rear direction at the lower end portion of the lower portion 135 of the second housing portion 13. The battery 19 is mounted on the lower side of each battery mounting portion 15.

Here, the configuration of the battery 19 that can be attached to and detached from each battery mounting portion 15 will be briefly described. As shown in FIGS. 1, 2 and 4, the battery 19 is formed in a substantially rectangular parallelepiped shape, and has a hook 193, a terminal (not shown), and a pair of guide grooves 191. For convenience of explanation, the vertical direction of the battery 19 is defined while it is mounted on the hammer drill 1.

The hook 193 and the terminal are provided on the upper portion of the battery 19 facing the battery mounting portion 15. The hook 193 is urged by a spring (not shown) at one end of the battery 19 in the longitudinal direction (horizontal direction in FIG. 2, orthogonal to the paper surface in FIG. 4) so as to always project upward from the upper surface, and a button. It is configured to retract downward from the upper surface by the pressing operation of 195. The terminal is provided on the upper part of the battery 19 adjacent to the hook 193. The pair of guide grooves 191 are formed as grooves extending linearly in the longitudinal direction on the upper portion of the pair of side surfaces arranged along the longitudinal direction of the battery 19.

In the present embodiment, of the two battery mounting portions 15, the front battery mounting portion 15 is provided on the front side portion of the lower portion 135, and the rear battery mounting portion 15 is the rear portion of the lower portion 135. It is provided in. The battery mounting portion 15 on the front side is arranged below the motor 2 on the rotating shaft A2. As shown in FIGS. 2 and 4, each battery mounting portion 15 is provided with a guide rail 151, a hook engaging portion 153, and a battery connection terminal 155.

The guide rail 151 is formed as a ridge that projects inward from the left and right wall surfaces along the lower end of the lower portion 135 and extends linearly in the front-rear direction (striking axis A1 direction). The guide rail 151 is configured to be slidably engaged with the guide groove 191 of the battery 19. The hook engaging portion 153 is a recess recessed upward, and is configured so that the hook 193 of the battery 19 can be engaged. The battery connection terminal 155 is configured to be electrically connected to the terminal of the battery 19 as the battery 19 is fixed to the battery mounting portion 15 by engaging the hook 193 with the hook engaging portion 153. There is.

In the present embodiment, the front battery mounting portion 15 and the rear battery mounting portion 15 have the same configuration, but the battery 19 is attached / detached in different directions. Specifically, the battery mounting portion 15 on the front side is slid-engaged from the front to the rear with the battery 19 having the hook 193 arranged at the front upper end portion and the guide rail 151 engaged with the guide groove 191. It is configured to be. Therefore, the hook engaging portion 153 is arranged at the front end portion of the battery mounting portion 15, and the battery connecting terminal 155 is configured to connect to the terminal of the battery 19 from the rear. On the other hand, the battery mounting portion 15 on the rear side is slid-engaged from the rear to the front with the battery 19 having the hook 193 arranged at the rear upper end portion and the guide rail 151 engaged with the guide groove 191. It is configured as follows. Therefore, the hook engaging portion 153 is arranged at the rear end portion of the battery mounting portion 15, and the battery connecting terminal 155 is configured to connect to the terminal of the battery 19 from the front.

As described above, the battery mounting portion 15 on the front side is configured so that the battery 19 is mounted from the front to the rear, and the battery mounting portion 15 on the rear side is mounted so that the battery 19 is mounted from the rear to the front. With this configuration, the battery 19 mounted on one battery mounting portion 15 does not interfere with the battery 19 when the battery 19 is attached to or detached from the other battery mounting portion 15. Therefore, the operability at the time of attaching / detaching the two batteries 19 can be kept good.

The guide rails 151 of the battery mounting portions 15 on the front side and the rear side are arranged along the same virtual straight line extending horizontally in the front-rear direction. That is, the two battery mounting portions 15 are arranged in a row in the front-rear direction at the same position in the vertical direction.

As shown in FIG. 2, the two battery mounting portions 15 configured as described above are arranged side by side in the front-rear direction at the lower end portion of the lower portion 135, so that the two battery connection terminals 155 are arranged in the front-rear direction. A space 150 is formed between them. Of the lower portion 135 (more specifically, the peripheral wall portion 136 of the lower portion 135), three vents 139 that communicate the inside and the outside of the lower portion 135 are formed in the area covering the space 150. Has been done. In the present embodiment, three vents 139 are provided on the left and right walls covering the space 150. Further, the vent 139 functions as an inflow port for cooling air.

As shown in FIGS. 1 and 2, a lighting unit 6 is provided at the front end of the lower portion 135. The lighting unit 6 of the present embodiment is mainly composed of a light emitting diode (LED) as a light source and a case made of a translucent material (transparent resin, glass, etc.) accommodating the LED. In the lighting unit 6, the light irradiation direction is set so that the light emitted by the LED illuminates the working position by the tip tool 18 (in other words, the processing target portion of the workpiece or the tip portion of the tip tool 18). ..

Further, as shown in FIG. 2, the lower portion 135 includes a controller 5 for controlling the operation of the hammer drill 1. In the present embodiment, the controller 5 is configured as a control device for the motor 2 which is a brushless motor. More specifically, the controller 5 is configured as a circuit board on which a control circuit (for example, a microcomputer including a CPU and a memory), an inverter circuit, and the like are mounted. In this embodiment, the controller 5 also functions as a control device for the lighting unit 6.

The controller 5 is arranged adjacent to the space 150 formed between the two battery connection terminals 155 so as to overlap at least a part of the two battery mounting portions 15 in the front-rear direction. More specifically, the controller 5 is located above the space 150, with its central portion overlapping the space 150 and its front and rear ends being front and rear when viewed from above (or from below). It is arranged so as to partially overlap the battery mounting portion 15 on the side. Further, the controller 5 has a wiring terminal 51 to which wiring (not shown) for electrically connecting the controller 5 to the motor 2, the lighting unit 6, the switch unit 140, and the like is connected. The controller 5 is arranged so that the wiring terminal 51 projects toward the space 150 below.

In the present embodiment, when the trigger 14 is pressed and the lighting switch of the switch unit 140 is changed from the always off state to the on state, the controller 5 causes the lighting unit based on the on signal output from the lighting switch. Turn on the LED of 6. When the trigger 14 is further pressed to the maximum and the motor switch is turned on, the controller 5 energizes and drives the motor 2 based on the output on signal. As described above, since the operation times of the contacts of the lighting switch and the motor switch are different, the lighting unit 6 is thus turned on before the driving of the motor 2 is started, and the motor 2 is turned on. It is turned off after the drive is stopped.

Hereinafter, the details of the vibration-proof housing structure of the housing 10 will be described with reference to FIGS. 2 to 6. As described above, in the housing 10, the first housing portion 11 including the grip portion 131 is elastically connected to the first housing portion 11 accommodating the motor 2 and the drive mechanism 3. The vibration transmission from the housing portion 13 to the second housing portion 13 (particularly, the grip portion 131) is suppressed.

More specifically, as shown in FIG. 2, a pair of left and right first springs 71 are arranged between the drive mechanism accommodating portion 117 of the first housing portion 11 and the upper portion 133 of the second housing portion 13. ing. Although only the first spring 71 on the right side is shown in FIG. 2, the configuration of the first spring 71 on the left side is the same as that on the right side. Further, a second spring 75 is arranged between the motor accommodating portion 111 of the first housing portion 11 and the lower portion 135 of the second housing portion 13. That is, the first housing portion 11 and the second housing portion 13 are elastically connected via the first spring 71 and the second spring 75 on the upper end side and the lower end side of the grip portion 131. In addition to these springs, an O-ring 79 formed of an elastic member is arranged in an intervening manner between the front end portion of the drive mechanism accommodating portion 117 and the cylindrical front side portion of the upper portion 133.

The details of the arrangement of the first spring 71 will be described. As shown in FIGS. 2 and 4, a plate member 72 is fixed to the rear end of the drive mechanism accommodating portion 117 with screws. A pair of left and right spring receiving portions 73 are provided at the upper end of the rear surface of the plate member 72. The spring receiving portion 73 has a cylindrical portion that projects rearward. Further, a pair of left and right spring receiving portions 74 are provided at the rear end portion of the upper portion 133 arranged on the rear side of the spring receiving portion 73. The spring receiving portion 74 has a cylindrical portion that projects forward.

In this embodiment, a compression coil spring is adopted as the first spring 71. The first spring 71 has a spring receiving portion in a state where both ends thereof are covered with the respective cylindrical portions of the spring receiving portions 74 and 73 so that the central axis extends in the striking axis A1 direction (that is, the front-rear direction). It is arranged in an elastic manner between 74 and 73. The first spring 71 urges the first housing portion 11 (drive mechanism accommodating portion 117) and the second housing portion 13 (upper portion 133) in a direction in which the grip portion 131 is separated from the first housing portion 11. .. In other words, the first spring 71 urges the first housing portion 11 forward and the second housing portion 13 including the grip portion 131 rearward in the front-rear direction, which is the direction of the striking shaft A1.

The details of the arrangement of the second spring 75 will be described. As shown in FIGS. 2 and 5, the spring receiving portion 76 projects downward from the central portion of the front lower end portion of the motor accommodating portion 111. The spring receiving portion 76 includes a front wall portion and left and right side wall portions, and the rear side is open. Further, a spring receiving portion 77 provided in the lower portion 135 as a recess having an opening on the front side is arranged on the rear side of the spring receiving portion 76. In this embodiment, the second spring 75 is also a compression coil spring. The second spring 75 is in a state where both ends are in contact with the rear surface and the front surface of the spring receiving portions 76, 77 so that the central axis of the second spring 75 extends in the striking axis A1 direction (that is, the front-rear direction). , 77 are arranged in a resilient manner. The second spring 75 urges the first housing portion 11 (motor accommodating portion 111) and the second housing portion 13 (lower portion 135) in a direction in which the grip portion 131 is separated from the first housing portion 11. .. That is, the second spring 75, like the first spring 71, urges the first housing portion 11 forward and the second housing portion 13 rearward.

Further, the housing 10 is provided with a sliding guide structure when the first housing portion 11 and the second housing portion 13 are relatively moved. In the present embodiment, as a sliding guide structure, an upper guide portion 8 and a lower guide portion 9 are provided at two locations on the upper side and the lower side of the motor main body portion 20.

First, the detailed configuration of the upper guide portion 8 will be described with reference to FIGS. 3 and 4. As shown in FIG. 3, the bottomed rectangular tubular motor accommodating portion 111 is connected to the peripheral wall portion 112 surrounding the motor 2 in the circumferential direction and the lower end of the peripheral wall portion 112 to form the lower end portion of the motor accommodating portion 111. Includes bottom 113. The outer edge of the bottom 113 forms a stepped portion 114 that is recessed above the central portion. The upper sliding portion 81 is formed in a substantially rectangular frame shape as a member separate from the peripheral wall portion 112, and is attached to the outer periphery of the upper end portion of the peripheral wall portion 112. The upper surface of the upper sliding portion 81 is formed as a plane parallel to the striking axis A1 (that is, a plane whose normal line is orthogonal to the striking axis A1), and constitutes the first upper sliding surface 811. In the present embodiment, the first upper sliding surface 811 is a plane extending in the horizontal direction (that is, a plane orthogonal to the striking axis A1 and having a normal line parallel to the rotation axis A2 of the motor shaft 25). Has been done.

On the other hand, the lower surface of the opening (lower end) of the upper portion 133 is also formed as a plane parallel to the striking axis A1 (that is, a plane whose normal line is orthogonal to the striking axis A1), and the second upper sliding surface is formed. It constitutes a moving surface 821. In the present embodiment, the second upper sliding surface 821 is also a flat surface extending in the horizontal direction, and the first upper sliding surface 811 and the second upper sliding surface 821 are in contact with each other in a surface contact with each other. It is slidable. The first upper sliding surface 811 and the second upper sliding surface 821 constitute the upper guide portion 8.

The upper sliding portion 81 having the first upper sliding surface 811 is formed of at least a material different from the upper portion 133 having the second upper sliding surface 821. In the present embodiment, the second housing portion 13 (grip portion 131, upper portion 133, and lower portion 135) and the peripheral wall portion 112 and the bottom portion 113 of the motor accommodating portion 111 are all made of polyamide resin. On the other hand, the upper sliding portion 81 is made of a polycarbonate resin.

As shown in FIG. 4, of the peripheral wall portions 112, the portions constituting the left and right wall portions protrude upward from the upper sliding portion 81 mounted on the outer periphery, and are inside the lower end portion of the upper portion 133. Includes the arranged guide portion 115. In the guide portion 115, when the first upper sliding surface 811 and the second upper sliding surface 821 slide and the upper portion 133 moves relative to the motor accommodating portion 111, the upper portion 133 moves to the motor accommodating portion 111. It is restricted from moving in the left-right direction with respect to the above, and is guided to move in the direction of the striking axis A1. As a result, in the present embodiment, the first upper sliding surface 811 and the second upper sliding surface 821 slide in the striking axis A1 direction (front-back direction) in a state of being in contact with each other.

The configuration of the lower guide portion 9 will be described with reference to FIGS. 2 to 6. Like the upper guide portion 8, the lower guide portion 9 has a first lower sliding surface 911 formed on the lower sliding portion 91 of the motor accommodating portion 111 and a second lower surface formed on the lower portion 135. It is composed of a side sliding surface 921.

As shown in FIGS. 3 and 6, the lower sliding portion 91 is mounted on the outer periphery of the lower end portion of the peripheral wall portion 112 of the motor accommodating portion 111. The lower sliding portion 91 includes an outer peripheral portion 912, an outer edge portion 913, and a protruding portion 914. The outer peripheral portion 912 is formed in a rectangular frame shape and is attached to the outer periphery of the peripheral wall portion 112. The outer edge portion 913 projects inward from the outer peripheral portion 912 along the step portion 114 formed on the outer edge portion of the bottom portion 113. The protruding portion 914 projects downward from the inner end of the outer edge portion 913 to a position substantially the same as the central portion of the bottom portion 113. The lower surface of the outer edge portion 913 is formed as a plane parallel to the striking axis A1 (that is, a plane whose normal line is orthogonal to the striking axis A1), and constitutes the first lower sliding surface 911. In the present embodiment, the first lower sliding surface 911 is a flat surface extending in the horizontal direction.

Further, the lower sliding portion 91 is made of at least a material different from that of the lower portion 135. In the present embodiment, the lower sliding portion 91 is made of polycarbonate resin like the upper sliding portion 81.

As shown in FIGS. 3, 5 and 6, a plate member 917 is fixed to the bottom 113 so as to face the outer edge 913 of the lower sliding portion 91. In the present embodiment, the plate member 917 is configured as a substantially U-shaped sheet metal with the rear side open, and is fixed to the bottom 113 from below with screws so as to face the outer edge 913. A gap is formed in the vertical direction between the first lower sliding surface 911, which is the lower surface of the outer edge portion 913, and the upper surface of the plate member 917.

Further, as shown in FIGS. 3 and 5, the plate member 917 is provided with a pair of left and right front stopper portions 918 and a pair of left and right rear stopper portions 919. Both the front stopper portion 918 and the rear stopper portion 919 are formed by bending a part of the plate member 917 downward. In the front stopper portion 918 and the rear stopper portion 919, the lower portion 135 cooperates with the front contact portion 137 and the rear contact portion 138, which will be described later, with respect to the motor accommodating portion 111 in the striking axis A1 direction (that is, front and rear). It is configured to regulate relative movement beyond a predetermined range in the direction).

As shown in FIGS. 3, 5, and 6, an intervening portion 922 that projects inward from the peripheral wall portion 136 of the lower portion 135 is formed in the opening (upper end portion) of the lower portion 135. There is. Although FIG. 5 is a bottom view of the motor accommodating portion 111, for convenience of explanation, the inner surface of the peripheral wall portion 136 of the lower portion 135 and the protruding end of the intervening portion 922 are shown by chain lines and alternate long and short dash lines, respectively. There is.

At least a part (specifically, a part other than the rear part) of the intervening portion 922 is arranged in a gap formed between the first lower sliding surface 911 and the upper surface of the plate member 917, and is arranged in the motor accommodating portion 111. On the other hand, it is configured to be slidable. The vertical thickness of the intervening portion 922 is substantially the same as the distance between the first lower sliding surface 911 and the upper surface of the plate member 917. The upper surface of the intervening portion 922 is formed as a plane parallel to the striking axis A1 (that is, a plane whose normal line is orthogonal to the striking axis A1), and constitutes a second lower sliding surface 921. In the present embodiment, the second lower sliding surface 921 is also a flat surface extending in the horizontal direction. The first lower sliding surface 911 and the second lower sliding surface 921 can slide in a state where they are in contact with each other at the surface contact.

In the protruding portion 914 of the lower sliding portion 91, the first lower sliding surface 911 and the second lower sliding surface 921 slide, and the lower portion 135 moves relative to the motor accommodating portion 111. Occasionally, the left side portion and the right side portion abut on the intervening portion 922 to restrict the lower portion 135 from moving in the left-right direction with respect to the motor accommodating portion 111, and guide the lower portion 135 to move in the striking axis A1 direction. .. As a result, in the present embodiment, the first lower sliding surface 911 and the second lower sliding surface 921 slide in the striking shaft A1 direction (front-back direction) in a state of being in contact with each other.

As shown in FIGS. 3 and 5, a pair of left and right front contact portions 137 projecting rearward are provided at the front upper end portion of the peripheral wall portion 136 of the lower portion 135, respectively. Further, a pair of left and right rear contact portions 138 protruding inward of the lower portion 135 are provided at the rear upper end portion of the peripheral wall portion 136 of the lower portion 135, respectively. The front contact portion 137 is configured to be able to contact the front surface of the front stopper portion 918. The rear contact portion 138 is configured to be able to contact the rear surface of the rear stopper portion 919. In the front contact portion 137 and the rear contact portion 138, the lower portion 135 cooperates with the front stopper portion 918 and the rear stopper portion 919 in the striking axis A1 direction (that is, the front-rear direction) with respect to the motor accommodating portion 111. It is configured to regulate relative movement beyond a predetermined range.

The operation and effect of the hammer drill 1 configured as described above will be described. As described above, the first housing portion 11 and the second housing portion 13 are urged forward and backward, respectively, by the first spring 71 and the second spring 75, respectively. Therefore, as shown in FIGS. 2 and 3, in the initial state before the machining work is started, the front stopper portion 918 of the plate member 917 is in contact with the rear surface of the front contact portion 137. That is, the front contact portion 137 comes into contact with the front stopper portion 918, thereby defining the initial arrangement of the lower portion 135 with respect to the motor accommodating portion 111. As shown in FIGS. 2 and 4, in the hammer drill 1 in the initial state, the first upper sliding surface 811 and the second upper sliding surface 821 are in contact with each other on the entire circumference of the motor accommodating portion 111.

When the trigger 14 is pressed by the operator, the driving of the motor 2 is started. The hammer drill 1 vibrates due to the driving of the motor 2 and the drive mechanism 3. In the present embodiment, the second housing portion 13 including the grip portion 131 gripped by the operator is first movable relative to the first housing portion 11 accommodating the motor 2 and the drive mechanism 3 which are vibration sources. It is connected via a spring 71 and a second spring 75. As a result, vibration transmission from the first housing portion 11 to the second housing portion 13 (particularly the grip portion 131) can be suppressed.

In particular, in the present embodiment, the first spring 71 and the second spring 75 are compression coil springs that urge the first housing portion 11 and the second housing portion 13 in a direction in which the grip portion 131 is separated from the first housing portion 11. It is composed of. Then, the first housing portion 11 and the second housing portion 13 are connected to each other at both ends of the grip portion 131 via the first spring 71 and the second spring 75. As a result, it is possible to more effectively suppress the transmission of vibration from the first housing portion 11 to the grip portion 131.

Further, the upper sliding portion 81 and the lower sliding portion 91, which are configured to be slidable with the upper portion 133 and the lower portion 135 of the second housing portion 13, are located in two places of the first housing portion 11. It is provided. More specifically, the upper sliding portion 81 and the lower sliding portion 91 are arranged on both sides of the motor main body portion 20 in the rotation axis A2 direction of the motor shaft 25. Therefore, as compared with the case where the sliding guide structure is provided only at one place on one side of the motor main body 20, the first housing portion 11 and the first housing portion 11 and the second housing portion 11 when the first housing portion 11 and the second housing portion 13 move relative to each other. 2 The stability of sliding between the housing portion 13 and the housing portion 13 can be improved.

The lower sliding portion 91 has a first lower sliding surface 911 which is a plane parallel to the striking shaft A1. The first lower sliding surface 911 can slide in the striking axis A1 direction (front-back direction) in a state of being in contact with the second lower sliding surface 921 formed on the lower portion 135. In this case, since the first lower sliding surface 911 and the second lower sliding surface 921 can guide the first housing portion 11 and the second housing portion 13 in a state where they are in contact with each other by surface contact, they slide. The stability of the housing can be further improved. Further, by setting the sliding direction at this time to the striking shaft A1 direction, it is effective that the largest and dominant vibration in the striking shaft A1 direction among the vibrations generated by the hammer drill 1 is transmitted to the grip portion 131. Can be suppressed.

As shown in FIG. 7, during the machining operation, the second housing portion 13 moves forward relative to the first housing portion 11 against the urging force of the first spring 71 and the second spring 75. In this case, the rear contact portion 138 comes into contact with the rear surface of the rear stopper portion 919, thereby restricting the lower portion 135 from moving further forward with respect to the motor housing portion 111. At this time, of the first upper sliding surface 811 of the upper sliding portion 81 provided over the entire circumference of the motor accommodating portion 111, the rear side portion is larger than the second upper sliding surface 821 of the upper portion 133. Although it is arranged rearward, since the upper surface of the peripheral wall portion 112 of the motor accommodating portion 111 abuts on the second upper sliding surface 821, there is no gap between the upper portion 133 and the motor accommodating portion 111. As a result, it is possible to prevent dust and the like from entering the inside of the housing 10.

In the present embodiment, as shown in FIG. 3, it is fixed to the lower end portion of the motor accommodating portion 111 (more specifically, the lower surface of the outer edge portion 913 of the lower sliding portion 91) and the lower end portion of the motor accommodating portion 111. An intervening portion 922 provided at the upper end of the lower portion 135 is arranged in the gap between the plate member 917 and the plate member 917. The first lower sliding surface 911 is formed on the lower surface of the outer edge portion 913, and the second lower sliding surface 921 is formed on the upper surface of the intervening portion 922. By providing the intervening portion 922 in this way, the sliding guide structure in the striking shaft A1 direction can be reliably realized with a simple configuration. Further, since the plate member 917 of the present embodiment is made of metal, even if the hammer drill 1 is dropped on the ground and receives a severe impact, the plate member 917 itself or the plate member 917 can be bent without cracking. Damage to the intervening portion 922 can be suppressed.

In the present embodiment, of the first housing portion 11, the lower sliding portion 91 having the first lower sliding surface 911 is made of a material different from the second housing portion 13 having the second lower sliding surface 921. Is formed of. Therefore, it is possible to prevent the first lower sliding surface 911 and the second lower sliding surface 921 from being welded to each other as they slide. Further, in the present embodiment, the upper sliding portion 81 that slides with the upper portion 133 is also made of a material different from that of the second housing portion 13. Therefore, similarly, it is possible to prevent the first upper sliding surface 811 and the second upper sliding surface 821 from being welded to each other.

In the present embodiment, the lower portion 135 is equipped with a battery such that the battery 19 can be attached to and detached from the end portion (that is, the lower end portion) on the side farther from the upper portion 133 in the rotation axis A2 direction (vertical direction). The part 15 is provided. Since the lower portion 135 is elastically connected to the first housing portion 11 accommodating the motor 2 and the drive mechanism 3, chattering when the battery 19 is mounted on the battery mounting portion 15 can be suppressed. .. Further, by mounting the battery 19 on the battery mounting portion 15, the mass of the second housing portion 13 can be increased, and the vibration of the second housing portion 13 can be further reduced.

Further, in the present embodiment, two battery mounting portions 15 are arranged side by side in the striking axis A1 direction (front-rear direction). The lower portion 135 then has a vent 139 formed in a region covering the space 150 formed between the battery connection terminals 155. The controller 5 that controls the operation of the hammer drill 1 is arranged adjacent to the space 150 so as to overlap at least a part of the two battery mounting portions 15 in the front-rear direction. When a plurality of battery mounting portions 15 are arranged side by side, the space 150 between the battery connection terminals 155 tends to be a dead space. On the other hand, in the present embodiment, regarding the arrangement of the controller 5 and the plurality of battery mounting portions 15, the area that tends to be a dead space is effectively utilized as the area for providing the vent 139, and the efficiency of cooling the controller 5 is achieved. Can be realized. Further, by arranging both the battery mounting portion 15 and the controller 5 in the lower portion 135, wiring between the battery mounting portion 15 and the controller 5 can be facilitated.

Further, since the wiring terminal 51 of the controller 5 projects toward the space 150 between the battery connection terminals 155 of the battery mounting portion 15, the cooling air flowing in from the ventilation port 139 formed in the area covering the space 150 causes the wiring terminal 51 to project. , The wiring terminal 51 and the wiring can be effectively cooled.

Further, in the present embodiment, the fan 28 forms a flow of cooling air that flows in from the vent 139, passes around the controller 5, and then passes around the motor 2, so that the controller 5 and the controller 5 require cooling. The motor 2 can be cooled efficiently. In particular, in this embodiment, a brushless motor is adopted as the motor 2. Since the controller 5 as a control device for the brushless motor is equipped with a control circuit and an inverter circuit, there is a high demand for cooling. On the other hand, in the hammer drill 1, the control device of the brushless motor can be effectively cooled.

Since the striking tool such as the hammer drill 1 is configured to drive the tip tool 18 linearly in the striking shaft A1 direction, the dimension in the striking shaft A1 direction is generally set longer than in other directions. Often done. Therefore, as in the present embodiment, by arranging the plurality of battery mounting portions 15 in the direction parallel to the striking shaft A1, a compact arrangement can be made without increasing the dimensions in the other directions. Further, when a plurality of batteries 19 having the same shape are mounted on the battery mounting portions 15 arranged in parallel in this way, the bottom surfaces of the batteries 19 are arranged on substantially the same plane as shown in FIG. Therefore, the hammer drill 1 can be placed on a flat surface such as a floor or a work table in a stable posture with the bottom surface of the battery 19 facing downward.

In the present embodiment, the lighting unit 6 is configured to irradiate the lower portion 135 of the second housing portion 13, which is elastically connected to the first housing portion 11, with light toward the working position by the tip tool 18. Is provided. Therefore, the operator can easily confirm the state of the tip tool 18 and the workpiece arranged at the work position during the machining work using the hammer drill 1. Further, by providing the lighting unit 6 in the lower portion 135, the lighting unit 6 can be protected from vibration.

Further, the lighting unit 6 is configured to be turned on prior to the energization drive of the motor 2 in conjunction with the operation of the trigger 14 which is pressed by the operator to drive the energization of the motor 2. Therefore, the operator can turn on the lighting unit 6 only by operating the trigger 14 for energizing the motor 2, and further, even before starting the actual work, the working position by the tip tool 18 can be set. It can be easily confirmed. Further, in the present embodiment, since the lighting unit 6 is configured to be turned off after the drive of the motor 2 is stopped, it is possible to confirm the processed portion of the workpiece after the work is completed.

The correspondence between each component of the present embodiment and each component of the present invention is shown below. The hammer drill 1 is a configuration example corresponding to the "power tool" and the "striking tool" of the present invention. The striking shaft A1 is an example corresponding to the "drive shaft" of the present invention. The motor 2, the motor body 20, the stator 21, the rotor 22, and the motor shaft 25 have configurations corresponding to the "motor", "motor body", "stator", "rotor", and "motor shaft" of the present invention, respectively. This is an example. The drive mechanism 3 is a configuration example corresponding to the "drive mechanism" of the present invention. The housing 10 is a configuration example corresponding to the "housing" of the present invention. The striking element 36 and the motion conversion mechanism 30 are configuration examples corresponding to the “striking element” and the “motion conversion mechanism” of the present invention, respectively. The hammer drill mode and the hammer mode are examples corresponding to the "plurality of operation modes" of the present invention. The fan 28, the controller 5, and the vent 139 are configuration examples corresponding to the "fan", "controller", and "vent" of the present invention, respectively. The first housing portion 11, the second housing portion 13, and the grip portion 131 are configuration examples corresponding to the “first housing portion”, the “second housing portion”, and the “grip portion” of the present invention, respectively. The first spring 71, the second spring 75, and the O-ring 79 are configuration examples corresponding to the "elastic element" of the present invention, respectively. The battery mounting portion 15 is a configuration example corresponding to the “battery mounting portion” of the present invention. The lighting unit 6 is a configuration example corresponding to the "lighting device" of the present invention. The trigger 14 is a configuration example corresponding to the "operating member" of the present invention.

<Second Embodiment>
Hereinafter, the second embodiment will be described with reference to FIG. Most of the hammer drill 101 illustrated in this embodiment has the same configuration as the hammer drill 1 of the first embodiment. Therefore, in the following, the illustration and description of the same configuration will be omitted or simplified, and different configurations will be mainly described with reference to the drawings.

As shown in FIG. 8, the housing 100 of the hammer drill 101 is also elastically connected to the first housing portion 11 and the first housing portion 11 so as to be elastically connected to the first housing portion 11, as in the first embodiment. including. The configuration of the first housing portion 11 and its internal structure are the same as those of the first embodiment. That is, the motor 2 and the drive mechanism 3 are housed in the first housing portion 11. More specifically, in the first housing portion 11, the drive mechanism 3 is housed in the drive mechanism accommodating portion 117, and in the motor 2, the motor main body 20 is separated from the striking shaft A1 and the rotating shaft A2 is striking. It is arranged in the motor accommodating portion 111 so as to extend in a direction orthogonal to the axis A1. Further, the motor 2 is configured as a brushless motor (so-called flat motor) in which the ratio of the product thickness to the diameter of the stator 21 is set to 1/5 or less and the diameter of the rotor 22 is set to be larger than the product thickness. ing.

On the other hand, the configuration of the lower portion 160 of the second housing portion 130 and its internal structure are different from those of the first embodiment. More specifically, the lower portion 160, like the lower portion 135 (see FIG. 2) of the first embodiment, accommodates the controller 5 and has two battery mounting portions 15 configured so that the battery 19 can be attached and detached. Has. However, in the present embodiment, the two battery mounting portions 15 are both configured such that the guide rail 151 extends in the left-right direction of the hammer drill 101, and the battery 19 is left with respect to the battery mounting portion 15. It is installed from the side to the right.

Due to this configuration, the area of the peripheral wall portion of the lower portion 160 that covers the space formed between the battery connection terminals 155 of the two battery mounting portions 15 is not as large as that of the first embodiment. Therefore, in the present embodiment, the ventilation port 161 that functions as the inflow port of the cooling air is provided in the area corresponding to the controller 5 (the area that overlaps with the controller 5 in the side view) in the vertical direction. In this embodiment, six vents 161 are provided on the left and right wall portions of the lower portion 160. The flow of the cooling air formed by the fan 28 flows into the housing 100 from the vent 161 and passes around the controller 5, then passes around the motor 2 and flows out from the vent 134 (see FIG. 1). do. Therefore, although the arrangement position of the ventilation port 161 is different from that of the first embodiment, the controller 5 and the motor 2 can be efficiently cooled by the cooling air also in this embodiment.

Due to the difference in the mounting direction of the battery 19, the total length of the two battery mounting portions 15 in the front-rear direction is shorter than that of the first embodiment, and is shorter than the length of the lower portion 160 in the front-rear direction. .. Therefore, in the present embodiment, the front end portion and the rear end portion of the lower portion 160 are formed so as to project downward from the battery mounting portion 15 on the front side and the rear side of the two battery mounting portions 15, respectively. There is. In the vertical direction, the front end portion and the rear end portion of the lower portion 160 are configured so that their lower surfaces are substantially flush with the lower surface of the battery 19 mounted on the battery mounting portion 15. When the battery 19 is mounted on the battery mounting portion 15, the front end portion and the rear end portion of the lower portion 160 respectively remove at least one corner region 90 of the lower end portion of the exposed portion of the battery 19 from an external force. Functions as a battery protector to protect. More specifically, the front end may interfere with external forces, primarily from the front (including in the oblique direction) towards the two corner regions 90 of the front lower end of the front battery 19 to provide these corner regions 90. It functions as a front protection unit 163 to protect. The rear end protects these corner areas 90 mainly by interfering with external forces from the rear (including in the oblique direction) toward the two corner areas 90 of the rear lower end of the battery 19 on the rear side. It functions as a rear protection unit 165.

Also in the hammer drill 101 of the present embodiment configured as described above, by adopting the motor 2 configured as a flat brushless motor as in the first embodiment, the arrangement area of the motor 2 (that is, the motor accommodating portion) is adopted. The length of the rotation axis A2 direction of 111) is suppressed. With such a configuration, even if the lower portion 160 is arranged below the motor accommodating portion 111, and even if the battery 19 is mounted on the lower portion 160, it is possible to prevent the entire hammer drill 101 from becoming large. Can be done. In particular, when the crank mechanism is adopted as the motion conversion mechanism 30 of the drive mechanism 3 as in the first embodiment and the present embodiment, the drive mechanism 3 tends to be larger than the case where the swing member is adopted. By making the motor 2 have the above-described configuration, it is possible to suppress an increase in the size of the entire hammer drill 101. In addition, according to the hammer drill 101 of the present embodiment, the same effect as described in the first embodiment can be obtained with respect to the same configuration as that of the first embodiment.

In the present embodiment, the hammer drill 101 is a configuration example corresponding to the "power tool" and the "striking tool" of the present invention. The housing 100, the first housing portion 11, and the second housing portion 130 are configuration examples corresponding to the “housing”, the “first housing portion”, and the “second housing portion” of the present invention, respectively. The vent 161 is a configuration example corresponding to the "vent" of the present invention.

The above embodiment is merely an example, and the power tool according to the present invention is not limited to the configuration of the illustrated hammer drill 1. For example, the changes illustrated below can be made. In addition, only one or a plurality of these modifications may be adopted in combination with the hammer drill 1 shown in the embodiment or the invention described in each claim.

For example, in the above embodiment, as an example of the striking tool, one of two operation modes, a hammer drill mode in which the striking motion and the drilling motion are performed and a hammer mode in which only the striking motion is performed, can be selected and selected. Hammer drills 1 and 101 that can operate in the operation mode are listed. However, the striking tool may be, for example, a hammer drill having a drill mode for performing only a drill operation in addition to the hammer drill mode and the hammer mode as the operation mode, or an electric hammer whose operation mode is only the hammer mode. The power tool may be a power tool other than a striking tool (for example, a grinder, an angle drill, etc.).

In the above embodiment, an example in which two battery mounting portions 15 are arranged side by side in the front-rear direction is given. However, the number of battery mounting portions 15 may be three or more. Further, the direction in which the battery mounting portions 15 are arranged side by side is not limited to the direction parallel to the striking axis A1, and may be the direction intersecting the striking axis A1.

From the viewpoint of preventing chattering and improving the anti-vibration effect when the battery 19 is mounted, the battery mounting portion 15 is elastically connected to the first housing portion 11 accommodating the motor 2 and the drive mechanism 3 which are vibration sources. 2 It is preferable that the housing portion 13 is provided. However, it is not excluded that the battery mounting portion 15 is provided in the first housing portion 11. Further, the battery mounting portion 15 may be provided in a housing that does not have a vibration-proof housing structure. The housing having the anti-vibration housing structure does not necessarily have to have the same configuration as the housing 10. For example, in the housing 10, the number and positions of elastic elements for connecting the first housing portion 11 and the second housing portion 13 so as to be relatively movable with each other can be appropriately changed.

In the first embodiment, three vents 139 are formed in the lower portion 135 (peripheral wall portion 136) in the region covering the space 150 (more specifically, the left and right wall portions). Further, in the second embodiment, six vents 161 are formed at positions overlapping with the controller 5 in a side view. However, the number and shape of the vents 139 and 161 are not limited to this example, and can be changed as appropriate. Further, the flow of the cooling air for cooling the controller 5 is the flow that flows in from the vents 134 and flows out from the vents 139 and 161 as opposed to the flow that flows in from the vents 139 and 161 and flows out from the vents 134. It may be. In this case, the fan 28 forming the flow of the cooling air may be arranged below the motor 2.

In the above embodiment, the lighting unit 6 is configured to be turned on prior to the energization drive of the motor 2 and turned off after the drive of the motor 2 is stopped in conjunction with the pressing operation of the trigger 14. However, the timing of energizing and stopping the motor 2 and the timing of turning on and off the lighting unit 6 may be the same. The lighting unit 6 may be turned on before the start of driving the motor 2 and may be turned off at the same time as the driving of the motor 2 is stopped. Alternatively, the lighting unit 6 may be configured to be turned on and off according to the operation of another operating member (button or the like). Further, the lighting unit 6 does not necessarily have to be provided.

Further, in view of the gist of the present invention and the above-described embodiment, the following aspects are constructed. The following aspects may be adopted in combination with the hammer drills 1, 101 shown in the embodiments, the above modifications, or the invention described in each claim.
[Aspect 1]
The power tool
Further provided with a battery mounting portion provided in the housing and configured so that the battery can be attached and detached.
When the rotation axis direction is defined as the vertical direction, the motor is arranged below the striking axis, the battery mounting portion is arranged below the motor, and the motor is viewed from above. It may be arranged at a position where it overlaps with the motor.
[Aspect 2]
In aspect 1,
The power tool
Further comprising a controller housed in the housing and configured to control the operation of the power tool.
The controller may be arranged between the motor and the battery mounting portion in the vertical direction.
[Aspect 3]
The grip portion extends in the vertical direction when the rotation axis direction of the motor shaft is defined as the vertical direction.
The second housing portion is
An upper portion that is connected to the upper end portion of the grip portion and covers a part of the first housing portion,
Includes a lower portion that connects to the lower end of the grip
The first housing portion is
An upper sliding portion configured to be slidable with the upper portion of the second housing,
It may include a lower sliding portion that is slidable with the lower portion of the second housing and is provided on the lower side of the motor main body portion.
[Aspect 4]
In aspect 3,
The battery mounting portion may be formed in the lower portion.
[Aspect 5]
In aspect 3 or 4,
The power tool
A controller housed in the lower portion and configured to control the operation of the power tool may be further provided.

1, 101: Hammer drill 10, 100: Housing 11: First housing part 111: Motor housing part 112: Peripheral wall part 113: Bottom 114: Step part 115: Guide part 117: Drive mechanism housing part 13, 130: Second housing part 131: Grip part 133: Upper part 134, 139, 161: Vent 135: Lower part 136: Peripheral wall part 137: Front contact part 138: Rear contact part 14: Trigger 140: Switch unit 15: Battery mounting part 150 : Space 151: Guide rail 153: Hook engaging part 155: Battery connection terminal 163: Front side protection part 165: Rear side protection part 2: Motor 20: Motor body part 21: Stator 22: Rotor 25: Motor shaft 26, 27: Bearing 28: Fan 29: Drive gear 3: Drive mechanism 30: Motion conversion mechanism 31: Crankshaft 311: Driven gear 312: Crank pin 32: Connecting rod 33: Piston 34: Tool holder 35: Cylinder 36: Strike element 361: Striker 363: Impact bolt 365: Air chamber 38: Rotation transmission mechanism 39: Clutch 391: Mode switching dial 5: Controller 51: Wiring terminal 6: Lighting unit 71: First spring 72: Plate member 73: Spring receiving part 74: Spring Receiving part 75: Second spring 76: Spring receiving part 77: Spring receiving part 79: O ring 8: Upper guide part 81: Upper sliding part 811: First upper sliding surface 821: Second upper sliding surface 9: Lower guide portion 90: Corner region 91: Lower sliding portion 911: First lower sliding surface 912: Outer peripheral portion 913: Outer edge portion 914: Protruding portion 917: Plate member 918: Front stopper portion 919: Rear stopper Part 921: Second lower sliding surface 922: Intervening part 18: Tip tool 19: Battery 191: Guide groove 193: Hook 195: Button

Claims (11)

A power tool configured to perform work by driving a tip tool with respect to a predetermined drive shaft.
A motor including a motor body including a stator and a rotor, and a motor shaft extending from the rotor.
A drive mechanism configured to drive the tip tool by the power of the motor,
A housing that houses the motor and the drive mechanism ,
It is provided in the housing and is provided with a battery mounting portion configured so that the battery can be attached and detached .
The motor is arranged so that the motor main body is separated from the drive shaft and the rotation shaft of the motor shaft extends in a direction intersecting the drive shaft.
The motor is configured as a brushless motor in which the ratio of the product thickness to the diameter of the stator is set to 1/5 or less and the diameter of the rotor is set to be larger than the product thickness .
When the extending direction of the rotating shaft of the motor shaft is defined as the vertical direction, the motor is arranged below the drive shaft.
An electric tool characterized in that the battery mounting portion is arranged below the motor and is arranged at a position overlapping the motor when viewed from above the motor. The power tool according to claim 1.
The power tool is a striking tool configured to drive the tip tool linearly in the drive axis direction.
The drive mechanism
A striking element configured to drive the tip tool linearly in the drive axis direction by colliding with the tip tool.
It includes a motion conversion mechanism configured to convert the rotational motion of the motor into a linear motion and transmit it to the striking element.
The motion conversion mechanism is a power tool characterized in that it is configured as a crank mechanism. The power tool according to claim 1 or 2.
The power tool is configured so that any one of a plurality of operation modes can be selected according to an external operation, and is configured to operate according to the selected operation mode. Electric tool. The power tool according to any one of claims 1 to 3.
The fan rotated by the motor and
Further equipped with a controller configured to control the operation of the power tool.
The fan is configured to flow in through a vent formed in the housing, pass around the controller, and then form a flow of cooling air that passes around the motor. Electric tool. The power tool according to any one of claims 1 to 3.
Further equipped with a controller configured to control the operation of the power tool.
An electric tool characterized in that the controller is arranged in the housing in the vertical direction between the motor and the battery mounting portion. The power tool according to claim 4 or 5.
The controller is an electric tool characterized in that it is configured as a control device for the brushless motor. The power tool according to any one of claims 1 to 6.
Further provided with a grip portion configured to be gripped by an operator,
The housing portion includes a first housing portion that houses the motor and the drive mechanism.
The power tool is characterized in that the grip portion is connected to the first housing portion via an elastic element so as to be relatively movable. The power tool according to claim 7.
The housing includes a second housing portion connected via the elastic element so as to be movable relative to the first housing portion.
The second housing portion is a power tool having the grip portion. The power tool according to claim 8.
Further equipped with a controller configured to control the operation of the power tool.
It said second housing portion is adapted to accommodate said controller, power tool which comprises said battery mounting unit. The power tool according to claim 8 or 9.
A lighting device provided in the second housing portion and configured to irradiate light toward a working position by the tip tool.
Further provided with an operating member configured to be externally operated by an operator for energizing the motor.
The lighting device is an electric tool characterized in that it is configured to be lit prior to energization driving of the motor in conjunction with the external operation of the operating member. The power tool according to any one of claims 1 to 10.
A plurality of the battery mounting parts are provided .
The plurality of battery mounting portions are arranged below the motor in the housing, and at least one of the plurality of battery mounting portions is arranged at a position overlapping the motor when viewed from above the motor. Power tool.

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