JP2018047533A - Power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power tool which is configured so as to perform operations from a manual operation by a worker to completion of a preset operation as one cycle using a motor as a driving source, in which heat generated by the motor can be efficiently radiated.SOLUTION: A nailing machine 1 includes a trigger 131, a motor 2, a driving mechanism 3, a controller 4, a crank housing 320 and a heat transmission member 5. The controller 4 starts driving of the motor 2 in response to a pressing operation to the trigger 131 by a worker and stops the driving of the motor 2 when the driving mechanism 3 completes one cycle of a nail driving operation. The heat transmission member 5 is configured so as to form a heat transmission path different from a power transmission path ranging from the motor 2 to the driving mechanism 3, and release the heat generated by the motor 2 to the metal crank housing 320.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electric power tool configured to perform from a manual operation by an operator to completion of a preset operation as one cycle by using a motor as a drive source.

  2. Description of the Related Art There is known an electric tool configured to perform a cycle from manual operation by an operator to completion of a preset operation using a motor as a drive source. In such an electric tool, energization to the motor is started in response to manual operation of the operation member by the operator, and energization to the motor is stopped when a predetermined operation of one cycle by the drive mechanism is completed. For example, in the electro-pneumatic driving tool disclosed in Patent Document 1, the driver is linearly moved forward from the initial position by the compression device driven by the power of the motor to hit the nail, and then the initial position. By returning to, one cycle is completed.

Japanese Patent No. 5859372

  In the driving tool described above, the motor stops every time one cycle of operation is completed. Therefore, the driving time of the motor is shorter than that of the electric tool that drives the motor even during the so-called idling operation without actual work. . Therefore, even if the driving tool is provided with a fan driven by a motor, there is a possibility that the motor cannot be sufficiently cooled only by the fan. Therefore, in an electric tool in which the motor stops every cycle, such as the driving tool, further improvement is desired regarding heat radiation generated by the motor.

  The present invention more efficiently dissipates heat generated by a motor in an electric power tool configured to perform one cycle from manual operation by an operator to completion of a preset operation using a motor as a drive source. It is an object of the present invention to provide a technology that can be used.

  According to one aspect of the present invention, an electric motor is configured to perform a preset work operation starting from a manual operation by an operator, and is defined as one cycle from the manual operation to the completion of the work operation. A tool is provided. The electric tool includes an operation member, a motor, a drive mechanism, a control device, a metal member, and a heat transfer member.

  The operation member is configured to be manually operable by an operator. The drive mechanism is driven by the power of the motor and is configured to perform a preset operation. The control device is configured to start driving the motor in response to a manual operation on the operation member, and to stop driving the motor when the driving mechanism completes one cycle of work operation. The metal member is a member formed of metal as a material separately from the motor. The heat transfer member forms a heat transfer path different from the power transmission path from the motor to the drive mechanism, and is configured to release heat generated by the motor to the metal member.

  The “electric tool” in this aspect is also referred to as an “electric tool”, and generally refers to a tool that uses electric power as power, and includes a tool used for work and a gardening tool. Further, “one cycle” refers to one operation unit starting from manual operation of the operation member by the worker and ending with completion of a preset work operation. The “preset work operation” in one cycle may be, for example, a sequence of a plurality of different operations, or may be a plurality of repetitions of the same operation. For example, “a power tool that is configured to perform a preset work operation starting from a manual operation by an operator and that is defined as one cycle from the manual operation to the completion of the work operation” is, for example, a nail Examples thereof include a hammering machine, a tacker, a staple gun, a screw cutter, a reinforcing bar binding machine, and a pruning shears.

  For example, when a nail driver is employed as the power tool according to this aspect, the manual operation of the operation member by the operator is the starting point of one cycle, and the nail driving operation by the nail driver (specifically, the driver is initially The completion of the movement from the position to the operating position, driving the nail into the work piece, and returning to the initial position) is the end of one cycle. Then, the manual operation of the operation member again by the operator becomes the starting point of the next cycle. In addition, for example, in a nailing machine, when an operation is manually set once by an operator as an operation operation, an operation of driving one nail is set in advance, one cycle is one nail. The process ends when the driving operation is completed.

  The motor may be a direct current motor or an alternating current motor. The motor may be a motor having a brush or a so-called brushless motor not having a brush. From the viewpoint of output performance in terms of size ratio, it is preferable to employ a brushless motor.

  It is preferable that the metal member has a heat capacity corresponding to a calorific value assumed according to the specifications of the motor. Or it is preferable to make it the structure which improves a thermal radiation characteristic by setting the surface area of a metal member large, or making it fin shape. Although the kind of metal which forms a metal member is not specifically limited, It is preferable that it is a metal (for example, copper, aluminum, magnesium (all include an alloy)) with high heat conductivity. The heat transfer member can be configured to release heat generated by the motor to the metal member, for example, by being formed of a material having thermal conductivity.

  According to the electric tool of the present aspect, the heat transfer member forms a heat transfer path different from the power transfer path, and heat generated by a motor that is intermittently driven every predetermined cycle is transferred to resin or the like. It is possible to escape to a metal member having a higher thermal conductivity than Therefore, the heat generated by the motor can be efficiently radiated by the heat transfer member.

  According to one aspect of the present invention, the heat transfer member may be made of metal. Since the heat transfer member is also made of a metal having a high thermal conductivity, the heat of the motor can be released to the metal member more efficiently. In addition, it is preferable that the metal which forms a heat-transfer member is a metal (for example, copper, aluminum, magnesium) with high heat conductivity similarly to metal members.

  According to one aspect of the present invention, the power tool may be configured as a driving tool. The drive mechanism includes a driver configured to be linearly movable between an initial position and an operating position in a predetermined driving axis direction, and the driver moves the driving material from the initial position to the operating position. The operation of launching and returning from the operation position to the initial position may be performed as a work operation of one cycle. The power tool may further include a first housing portion that houses at least a part of the drive mechanism. The first housing part may also be a metal member, and the heat transfer member may be connected to the motor and the first housing part so as to be able to conduct heat. By using the metal first housing portion as a heat release destination of the motor, the heat generated by the motor can be efficiently radiated without increasing the number of components.

  In addition, regarding the “connection to the motor and the first housing portion so as to be able to conduct heat” as referred to in this embodiment, the connection mode is particularly limited as long as heat can be conducted to the motor and the first housing portion. Not limited. For example, the heat transfer member may be fixed to the motor and the first housing part, or may be arranged so as to contact the motor and the first housing part.

  According to one aspect of the present invention, the heat transfer member may have a heat transfer surface in surface contact with the stator of the motor. In this case, the contact area between the heat transfer member and the stator formed of metal can be increased, and the heat dissipation effect can be enhanced.

  According to one aspect of the present invention, the power tool may further include an elastic member that biases the heat transfer member against the stator. In this case, the heat dissipation effect can be further enhanced by increasing the adhesion of the heat transfer member to the stator by the biasing force of the elastic member.

  According to one aspect of the present invention, the power tool may further include a second housing portion that houses the motor. And the 1st accommodating part may be formed with the material whose heat conductivity is higher than the 2nd accommodating part. In this case, the heat generated in the motor can be efficiently radiated by releasing the heat to the first housing part having higher thermal conductivity than the second housing part that houses the motor.

  According to one aspect of the present invention, the electric power tool may further include a third housing portion that is disposed between the first housing portion and the motor and that houses a part of the drive mechanism. And the 3rd accommodating part is formed with the material whose heat conductivity is lower than the 1st accommodating part, and the heat transfer member may be in contact with the 3rd accommodating part. In this case, by bringing the heat transfer member into contact with the third housing portion between the motor and the first housing portion, heat can be released to the third housing portion to some extent. Compared with the case of non-contact, the heat dissipation effect can be further enhanced.

  According to one aspect of the present invention, the electric power tool may further include a fan that is driven by the power of the motor and configured to form a flow of cooling air that flows through a predetermined path. And at least one part of the heat-transfer member may be arrange | positioned on the path | route of cooling air. In this case, at least a part of the heat transfer member can be cooled by the cooling air flowing through the path.

  According to one aspect of the present invention, the electric power tool may further include an outer housing that forms an outline of the electric power tool. The outer housing may have an opening that exposes at least a part of the first housing portion to the outside. In this case, the heat released from the motor to the first housing portion can be radiated to the outside of the outer housing through the opening.

It is a left view which shows the external appearance of a nailing machine. FIG. 6 is a left side view of the nailing machine with the right side portion of the outer housing removed. It is a perspective view of a motor, a gear reduction mechanism, and a crank housing. It is a partial longitudinal cross-sectional view which shows the internal structure of the upper part of the nail driver in the state which has a 1st piston in the foremost position. FIG. 5 is a partial cross-sectional view corresponding to FIG. 4. It is a partial longitudinal cross-sectional view which shows the internal structure of the upper part of the nail driver in the state which has a 1st piston in the rearmost position. FIG. 7 is a partial cross-sectional view corresponding to FIG. 6. It is a perspective view of a heat-transfer member. It is a side view of a heat-transfer member. It is a perspective view of a pressing member. It is a top view of a pressing member.

  Embodiments of the present invention will be described below with reference to the drawings. In the embodiment, an example of an electric tool that is configured to perform a preset work operation starting from a manual operation by an operator, and that is defined as one cycle from the manual operation to the completion of the work operation. As an example, an electric-pneumatic nailing machine (hereinafter simply referred to as a nailing machine) will be described. The nailing machine 1 drives a nail (not shown) in a straight line along the drive shaft A1 (that is, hits the nail and moves it in a straight line), whereby a workpiece (for example, wood) is processed. ) Is an example of a driving tool capable of performing a nail driving operation.

  First, the schematic configuration of the nailing machine 1 will be described with reference to FIG. As shown in FIG. 1, the outline of the nailing machine 1 is mainly formed by an outer housing 10, a nose portion 15, and a magazine 17.

  The outer housing 10 includes a main body portion 11 and a handle portion 13. The main body 11 has a first portion 111 that extends along the direction of the drive axis A1 and a direction that intersects the drive axis A1 from one end portion of the first portion 111 in the direction of the drive axis A1 (more specifically, substantially perpendicular). And a second portion 112 projecting from the second portion 112. The main body 11 houses the motor 2 and the drive mechanism 3 (see FIG. 2) configured to drive out nails. The handle portion 13 is a portion that protrudes substantially parallel to the second portion 112 from the other end portion of the first portion 111 in the direction of the drive axis A1. The handle portion 13 is configured to be gripped by an operator and includes a trigger 131 operated by the operator. The projecting side end of the handle portion 13 is connected to the projecting side end of the second portion 112. A battery mounting portion 138 configured to be detachable from the rechargeable battery 9 is provided at the protruding end of the handle portion 13. The nailing machine 1 is operated by electric power supplied from the battery 9.

  Hereinafter, for convenience of explanation, the direction of the drive shaft A1 is defined as the front-rear direction of the nailing machine 1, the second portion 112 side is referred to as the front side, and the handle portion 13 side is referred to as the rear side. Further, the direction perpendicular to the direction of the drive shaft A1 and corresponding to the protruding direction of the second portion 112 and the handle portion 13 is defined as the vertical direction of the nail driver 1, the first portion 111 side is the upper side, and the battery mounting portion 138 side Is defined as the lower side.

  The nose portion 15 is connected to the front end portion of the first portion 111 so as to protrude forward along the drive shaft A1. An injection port 150 through which a nail is driven is formed at the front end portion of the nose portion 15. Inside the nose portion 15, a passage 151 (see FIG. 6) for a driver 367, which will be described later, extends to the injection port 150 along the drive axis A1.

  Further, a contact arm 18 projecting forward is disposed on the first portion 111 so as to be movable relative to the first portion 111 in the front-rear direction. The contact arm 18 is urged forward by a coil spring 181, and its front end is always disposed in front of the injection port 150. When the contact arm 18 is pressed against the workpiece by the operator during use of the nailing machine 1, the contact arm 18 moves backward against the biasing force of the coil spring 181. Note that a contact arm switch 182 (only a part of which is shown in FIG. 5) is arranged inside the first portion 111 so as to be switched between an on state and an off state in accordance with the pressed state of the contact arm 18. Yes. The contact arm switch 182 is maintained in the off state in the initial state where the pressing of the contact arm 18 is released, and is switched to the on state while the contact arm 18 is pressed.

  The magazine 17 is configured to be able to load a plurality of nails, and is disposed on the front side of the second portion 112 and substantially parallel to the second portion 112. The upper end portion (end portion on the nail supply side) of the magazine 17 is connected to the lower portion of the nose portion 15, and the rear lower end portion is connected to the front lower end portion of the second portion 112. The nails loaded in the magazine 17 are supplied one by one to the passage 151 (see FIG. 6) in the nose portion 15 by a nail feeding mechanism (not shown). In the present embodiment, the motor 2 is driven according to the operation of the trigger 131 by the operator and the pressing of the contact arm 18 against the workpiece, and the drive mechanism 3 drives out the nail.

  Hereinafter, the internal structure of the outer housing 10 will be described with reference to FIGS.

  As shown in FIG. 2, the motor 2, the drive mechanism 3, and the heat transfer member 5 are accommodated in the main body 11 of the outer housing 10. Further, the trigger switch 132 and the controller 4 are accommodated in the handle portion 13. These detailed configurations will be described in order. However, the heat transfer member 5 will be described in detail later.

  Hereinafter, the motor 2 will be described with reference to FIGS. 2 and 3. In the present embodiment, the motor 2 is configured as a direct current motor. As shown in FIG. 2, the motor housing 20 has a cylindrical shape, a stator 22 accommodated in the motor housing 20, a rotor (not shown), And a fan 25 and an output shaft (not shown) that rotates with the rotor. In the present embodiment, the motor 2 includes the second portion 112 of the main body portion 11 so that the rotation axis A2 of the output shaft is orthogonal to the drive shaft A1 (specifically, extends in the vertical direction). Located at the bottom. The motor housing 20 is made of resin.

  The stator 22 is made of metal (specifically, a laminated steel plate). As shown in FIG. 3, a rectangular opening 201 is formed in a part of the outer peripheral portion of the motor housing 20 facing the stator 22. 3 shows only the opening 201 on the left side of the motor housing 20, the opening 201 is also formed on the right side as shown in FIG. A part of the outer peripheral surface of the stator 22 is exposed to the outside of the motor housing 20 through the opening 201.

  The fan 25 is fixed to an output shaft (not shown) of the motor 2 and is rotated by the power of the motor 2. In the present embodiment, a centrifugal fan is employed as the fan 25. The motor housing 20 has a vent hole 205 provided around the opening 201 and on the radially outer side of the fan 25. The vent 205 communicates the inside and the outside of the motor housing 20. As shown in FIG. 1, the second portion 112 of the outer housing 10 includes a vent 108 formed so as to face the vent 205 around the opening 201 of the motor housing 20, and a radially outer side of the fan 25. And a vent 106 formed so as to face the vent 205 provided. The fan 25 flows into the outer housing 10 from the opening 108, flows inside the second portion 112, and forms a flow of cooling air that flows out from the vent 106. A part of the cooling air flows from the lower end portion of the second portion 112 toward the handle portion 13 to cool the controller 4 described later.

  Hereinafter, the drive mechanism 3 will be described with reference to FIGS. As shown in FIG. 2, the drive mechanism 3 of the present embodiment mainly includes a gear reduction mechanism 31, a crank mechanism 32, a compression mechanism 34, and an impact mechanism 36.

  The gear reduction mechanism 31 includes a plurality of gears, and is configured to transmit the rotational power of the output shaft of the motor 2 to the crank mechanism 32 after decelerating. In the present embodiment, the output shaft of the motor 2 protrudes upward from the motor housing 20, and the gear reduction mechanism 31 is disposed on the upper side of the motor 2. Since the gear reduction mechanism 31 is a well-known technique, detailed description and illustration are omitted here. In this embodiment, the gear reduction mechanism 31 is accommodated in a resin-made cylindrical gear housing 310. The gear housing 310 is connected and fixed to the upper side of the motor housing 20 with a screw, and is disposed on the upper portion of the second portion 112 of the main body 11.

  The crank mechanism 32 is configured to convert the rotational power of the motor shaft transmitted through the gear reduction mechanism 31 into a reciprocating motion of a first piston 343 of a compression mechanism 34 described later. As shown in FIG. 4, the crank mechanism 32 of this embodiment includes a crankshaft 321, an eccentric pin 323, and a connecting rod 325.

  The crankshaft 321 is a shaft that is arranged so as to extend in the vertical direction coaxially with the output shaft of the motor 2 and is rotated at a reduced speed by the gear reduction mechanism 31 around the rotation axis A2. The eccentric pin 323 is provided at a position eccentric from the rotation axis A2. One end of the connecting rod 325 is connected to an eccentric pin 323 so as to be relatively rotatable, and the other end is connected to a first piston 343 described later via a pin 344 so as to be relatively rotatable. In the present embodiment, the crank mechanism 32 is accommodated in a crank housing 320 made of metal (specifically, made of magnesium alloy). The crank housing 320 is connected and fixed to the upper side of the gear housing 310 with a screw, and is disposed at the front lower end portion of the first portion 111 of the main body portion 11.

  The compression mechanism 34 is configured to compress air in order to drive a second piston 363 described later. As shown in FIGS. 4 and 5, the compression mechanism 34 of the present embodiment includes a first cylinder 341 and a first piston 343.

  In the present embodiment, the first cylinder 341 is made of metal (specifically, made of an aluminum alloy) and is accommodated in the first portion 111 so that the axial direction thereof is parallel to the drive shaft A1. A part of the upper end portion of the first cylinder 341 is exposed to the outside through an opening 105 formed in the upper end portion of the first portion 111. A first piston 343 is disposed inside the first cylinder 341 so as to be slidable in the direction of the drive shaft A1. As described above, the connecting rod 325 connected to the first piston 343 via the pin 344 is disposed on the front side of the first piston 343, and the first piston 343 is geared as the motor 2 is driven. The crank mechanism 32 driven through the speed reduction mechanism 31 is reciprocated in the direction of the drive shaft A1 (front-rear direction).

  In the present embodiment, the initial position of the first piston 343 in the initial state where the driving of the motor 2 is not started is set to the foremost position shown in FIGS. 4 and 5. When the motor 2 is driven, the first piston 343 is reciprocated back and forth between the foremost position and the rearmost position shown in FIGS. 6 and 7. In the present embodiment, since energization of the motor 2 is controlled in accordance with the position of the first piston 343, a sensor (not shown) for detecting the position of the first piston 343 is provided. As such a sensor, any known sensor may be employed. For example, an angle sensor that can detect the rotation angle of the crankshaft 321, a position sensor that can detect the position of the eccentric pin 323, and the like can be employed.

  An internal space formed between the first piston 343 and the bottom portion (rear wall portion) of the first cylinder 341 constitutes a compression chamber 348 whose volume changes as the first piston 343 reciprocates. . Specifically, the air in the compression chamber 348 is compressed by the first piston 343 moving in the direction of decreasing the volume of the compression chamber 348, that is, from the foremost position toward the rearmost position.

  The striking mechanism 36 is configured to strike the nail in a straight line from the injection port 150 by striking the nail. As shown in FIGS. 4 and 5, the striking mechanism 36 of the present embodiment includes a second cylinder 361, a second piston 363, a driver 367, and a valve 365.

  The second cylinder 361 is disposed coaxially with the drive shaft A <b> 1 inside the first cylinder 341. More specifically, the second cylinder 361 is disposed in an upper space in the first cylinder 341, and a rear end portion thereof is fixed to the first cylinder 341. That is, the second cylinder 361 is disposed inside the first cylinder 341. Further, the front end portions of the first cylinder 341 and the second cylinder 361 are fitted into the crank housing 320 and connected and fixed integrally with the crank housing 320. As a result, the motor housing 20, the gear housing 310, the crank housing 320, the first cylinder 341 and the second cylinder 361 are integrally connected to constitute an assembly of the drive mechanism 3.

  The first piston 343 passes through the first piston 343 in the direction of the drive axis A1 and is formed with a through hole 345 having substantially the same diameter as the second cylinder 361. The second cylinder 361 is inserted through the through hole 345. Yes. The first piston 343 slides in close contact with the outer peripheral surface of the second cylinder 361 when reciprocating in the direction of the drive shaft A1.

  Inside the second cylinder 361, a second piston 363, a driver 367, and a valve 365 are arranged. More specifically, a valve 365 is disposed at the rear end of the second cylinder 361, and a second piston 363 is disposed on the front side of the valve 365. The driver 367 formed in the shape of a long bar is fixed to the front end portion of the second piston 363 so as to extend on the drive shaft A1.

  The valve 365 of the present embodiment is configured to move between a closed position and an open position, which will be described later, in synchronization with the movement of the first piston 343 in the front-rear direction. Further, the second piston 363 is disposed inside the second cylinder 361 so as to be slidable in the direction of the drive shaft A1. An air chamber 368 is formed between the valve 365 and the second piston 363.

  In the present embodiment, as shown in FIGS. 4 and 5, when the first piston 343 is disposed at the foremost position, the valve 365 includes the compression chamber 348 in the first cylinder 341 and the second cylinder 361. It arrange | positions in the closed position which obstruct | occludes the communication path 369 (refer FIG. 7) with the air chamber 368. At this time, the second piston 363 is disposed at the rearmost position in contact with the front end of the valve 365, and the front end portion of the driver 367 is separated from the nail disposed in the passage 151 (see FIG. 6) in the nose portion 15. Arranged at the initial position. The initial position is the rearmost position in the movement range of the driver 367.

  On the other hand, as shown in FIGS. 6 and 7, when the first piston 343 is moved to the rearmost position, the valve 365 opens the communication path 369 (see FIG. 7) between the compression chamber 348 and the air chamber 368. Placed in the open position. As a result, the air in the compression chamber 348 compressed by moving the first piston 343 to the rearmost position is supplied to the air chamber 368 of the second cylinder 361 via the communication path 369. The second piston 363 is moved forward by the compressed air supplied to the air chamber 368. The driver 367 fixed to the second piston 363 is moved linearly from the initial position to the operating position on the drive shaft A1. The operation position is the forefront position in the movement range of the driver 367.

  Hereinafter, the trigger switch 132 will be described with reference to FIG. As shown in FIG. 4, a trigger 131 that can be pressed by an operator is provided on the front side of the upper end portion of the handle portion 13, and a trigger switch 132 is provided on the rear side of the trigger 131 in the handle portion 13. Is arranged. The trigger switch 132 is configured to be switchable between an on state and an off state in accordance with the operation of the trigger 131. More specifically, the trigger switch 132 is maintained in the off state in the initial state where the trigger 131 is released, while being switched on while the trigger 131 is being pressed by the operator.

  Hereinafter, the controller 4 will be described with reference to FIG. As shown in FIG. 2, in this embodiment, the controller 4 is disposed in the vicinity of the battery mounting portion 138 in the lower end portion of the handle portion 13. The controller 4 of this embodiment is electrically connected to the motor 2, the trigger switch 132, the contact arm switch 182, and a position detection sensor (not shown) for the first piston 343. The controller 4 is configured to control energization of the motor 2 based on the on / off state of the trigger switch 132 and the contact arm switch 182.

  Hereinafter, the operation of the nailing machine 1 configured as described above will be described. In the nailing machine 1 of the present embodiment, the operation from the pressing operation of the contact arm 18 and the trigger 131 to the completion of the driving operation of one nail is set as one cycle. More specifically, when the operator presses the contact arm 18 against the workpiece and presses the trigger 131 once, the driving of the motor 2 is started under the control of the controller 4 starting from this operation. After the driving mechanism 3 performs the operation of driving one nail into the workpiece, the driving of the motor 2 is stopped. In the nailing machine 1, the driving operation of one nail is performed by moving the driver 367 from the initial position (see FIGS. 4 and 5) to the operating position (see FIGS. 6 and 7). Corresponds to the operation of returning to the initial position from the operating position.

  First, the contact arm switch 182 is turned on by the operator pressing the contact arm 18 against the workpiece. Next, when the trigger 131 is pressed and the trigger switch 132 is turned on, the driving of the motor 2 is started.

  By driving the motor 2, the crank mechanism 32 is driven through the gear reduction mechanism 31, and the first piston 343 starts moving backward. At this time, since the valve 365 closes the communication path 369 (see FIG. 5), the volume of the compression chamber 348 is reduced, and the air trapped in the compression chamber 348 is compressed. In synchronization with the movement of the first piston 343 to the rearmost position, the valve 365 opens the communication path 369 (see FIG. 7). Thereby, the compressed air in the compression chamber 348 is supplied to the air chamber 368 of the second cylinder 361, and the driver 367 is moved to the operating position together with the second piston 363 as shown in FIG. The driver 367 hits the rear end portion of the nail disposed in the passage 151 in the nose portion 15 in the process of moving from the initial position to the operating position, and drives the nail into the workpiece by driving out from the injection port 150. .

  When the first piston 343 is moved from the rearmost position to the foremost position by the crank mechanism 32, the volume of the compression chamber 348 increases, so that the compression chamber 348 becomes negative pressure. As a result, the second piston 363 is sucked through the communication passage 369 and the air chamber 368, moved rearward, and returned to the initial position. As shown in FIG. 4, the driver 367 returns from the operating position to the initial position. That is, the drive mechanism 3 completes the driving operation of one nail.

  With this, one cycle from the pressing operation of the contact arm 18 and the pressing operation of the trigger 131 to the completion of the driving operation of one nail is completed. Therefore, the controller 4 stops driving the motor 2 when the first piston 343 returns to the foremost position based on the detection result of the position detection sensor (not shown) of the first piston 343 described above. The valve 365 closes the communication path 369. Even if the trigger switch 132 and the contact arm switch 182 are maintained in the on state at this time, the controller 4 stops energization of the motor 2. If at least one of the trigger switch 132 and the contact arm switch 182 is turned off during the nail driving operation, the controller 4 stops energization of the motor 2.

  Hereinafter, the heat transfer member 5 disposed in the second portion 112 of the main body 11 will be described with reference to FIGS. 2, 3, and 8 to 11. The heat transfer member 5 is configured to form a heat transfer path different from the power transmission path from the motor 2 to the drive mechanism 3, and to release the heat generated in the motor 2 to a metal member other than the motor 2. It is a member. As shown in FIGS. 2 and 3, in this embodiment, two heat transfer members 5 are provided, and each of them can conduct heat to the stator 22 of the motor 2 and the metal crank housing 320. It is connected to the.

  As shown in FIGS. 8 and 9, the heat transfer member 5 is formed as a long plate member as a whole, and includes a motor side end 51, a crank side end 52, and a connection portion 53. Including. The motor-side end portion 51 is a portion that constitutes one end portion in the longitudinal direction of the heat transfer member 5 and is arranged in contact with the outer peripheral surface of the stator 22. The crank side end portion 52 constitutes the other end portion in the longitudinal direction of the heat transfer member 5 and is a portion disposed in contact with the crank housing 320. The connection portion 53 is a portion that connects the motor side end portion 51 and the crank side end portion 52. In the present embodiment, the connection portion 53 is formed in a long rectangular plate shape, and the motor side end portion 51 and the crank side end portion 52 are bent with respect to the connection portion 53. The motor side end 51 has a curved surface 510 corresponding to the outer peripheral surface of the stator 22. The crank side end 52 is formed in a flat plate shape.

  As shown in FIG. 3, in the heat transfer member 5, the connection portion 53 extends in the vertical direction to contact the outer surface of the gear housing 310, and the curved surface 510 of the motor side end portion 51 is the opening 201 of the motor housing 20. The crank-side end 52 is in close contact with the lower surface of the crank housing 320 and the upper surface of the gear housing 310, which are in surface contact with the outer peripheral surface of the stator 22 exposed from each other and are connected and fixed to each other with screws. It is arranged so that. Note that, as described above, in the present embodiment, the motor housing 20 has the openings 201 at the right side and the left side, so that the two heat transfer members 5 are connected to the outer housing 10 (details). Are arranged on the right and left sides of the drive mechanism 3 inside the second part 112).

  Further, in the present embodiment, the motor side end 51 is urged against the outer peripheral surface of the stator 22 by the pressing member 6. As shown in FIGS. 10 and 11, the pressing member 6 is configured as a U-shaped leaf spring as a whole. The pressing member 6 is configured so that both ends thereof are pressed against the motor housing 20 by being attached to the outer peripheral portion of the cylindrical motor housing 20 along the circumferential direction. Therefore, as shown in FIGS. 2 and 3, both end portions of the pressing member 6 are outside the two motor side end portions 51 arranged in contact with the outer peripheral surface of the stator 22 through the right and left openings 201, respectively. The curved surface 510 and the outer peripheral surface of the stator 22 are in close contact with each other.

  In this embodiment, the heat transfer member 5 is made of a metal having high thermal conductivity (specifically, copper). Heat generated by driving the motor 2 is input from the stator 22 to the motor side end portion 51, is conducted to the crank side end portion 52 via the connection portion 53, and further from the crank side end portion 52 to the metal crank. Conducted to the housing 320. That is, the heat of the motor 2 is released to the crank housing 320 by the heat transfer member 5. In addition, the curved surface 510 of the motor side end portion 51 that makes surface contact with the outer peripheral surface of the stator 22 and the surface 520 of the crank side end portion 52 that makes surface contact with the lower surface of the crank housing 320 function as heat transfer surfaces. Note that a first cylinder 341 made of metal (specifically, an aluminum alloy) is connected and fixed to the crank housing 320, so that heat can be further conducted from the crank housing 320 to the first cylinder 341. Further, between the motor housing 20 and the crank housing 320, the connection portion 53 of the heat transfer member 5 is in contact with the outer surface of the gear housing 310, so that a certain amount of heat can be released to the gear housing 310.

  As described above, the nail driver 1 according to the present embodiment performs a preset nail driving operation based on the pressing operation of the contact arm 18 and the pressing operation of the trigger 131 by the operator. It is configured as follows. In the nail driver 1, one cycle is set from the pressing operation of the contact arm 18 and the pressing operation of the trigger 131 to the completion of the driving operation of one nail. The controller 4 starts driving the motor 2 in response to the pressing operation of the contact arm 18 and the pressing operation of the trigger 131, and stops the driving of the motor 2 when the driving mechanism 3 completes the driving operation of one nail. It is configured. That is, in the nailing machine 1, the motor 2 is intermittently driven every cycle.

  The motor 2 generates heat as it is driven. As described above, the fan 25 rotated by the motor 2 forms a flow of cooling air that flows through the periphery of the motor 2 in the outer housing 10, but the fan 25 also rotates intermittently in the same manner as the motor 2. Therefore, there is a possibility that the motor 2 is not sufficiently cooled only by the fan 25. More specifically, if the cooling efficiency with respect to the heat generation of the motor 2 is poor, there is a possibility that the motor 2 burns out after the temperature of the motor 2 gradually increases. Further, for example, when the motor 2 is configured to stop driving by a protection circuit using a temperature sensor when the temperature of the motor 2 rises to a predetermined value, the nailing machine 1 is used. The work that was done cannot be continued. On the other hand, in this embodiment, a heat transfer path different from the power transfer path from the motor 2 to the drive mechanism 3 is formed, and the heat generated in the motor 2 is made of metal having high thermal conductivity (specifically, magnesium A heat transfer member 5 configured to escape to the crank housing 320 made of an alloy is provided. The heat transfer member 5 can efficiently dissipate heat generated by the motor 2. For this reason, the malfunction which arises when the temperature of the above motors 2 rises too much can be avoided. In the present embodiment, since the heat transfer member 5 having a high thermal conductivity is also made of metal (specifically, copper), the heat of the motor can be released to the metal member more efficiently.

  In the present embodiment, a new metal member is not provided as a heat release destination of the motor 2 but a crank housing 320 that houses the crank mechanism 32 is used. Therefore, the heat generated in the motor 2 can be efficiently radiated without increasing the number of parts of the nailing machine 1.

  In the present embodiment, the heat transfer member 5 has the curved surface 510 of the motor-side end 51 as a heat transfer surface in surface contact with the stator 22 of the motor 2. Therefore, the contact area between the heat transfer member 5 and the stator 22 formed of metal can be increased, and the heat dissipation effect can be enhanced. Further, the heat transfer member 5 (specifically, the motor side end portion 51) is urged against the stator 22 by a pressing member 6 configured as a leaf spring. By increasing the adhesion of the heat transfer member 5 to the stator 22 by the urging force of the pressing member 6, the heat dissipation effect can be further enhanced.

  Note that the crank-side end portion 52 of the heat transfer member 5 is also sandwiched between the crank housing 320 and the gear housing 310, so that adhesion to the crank housing 320 is enhanced. Thereby, heat conduction from the heat transfer member 5 to the crank housing 320 can be performed more efficiently. Further, when the crank housing 320 and the gear housing 310 are connected and fixed, the heat transfer member 5 has the crank side end portion 52 sandwiched therebetween, and then the motor side end portion 51 of the motor housing 20 is pressed by the pressing member 6. By being pressed against the stator 22 from the outside, it is connected to the motor 2 and the crank housing 320 so as to be able to conduct heat. Therefore, the heat transfer member 5 can be easily assembled as compared with the case where the heat transfer member 5 is fixed to the motor 2 or the crank housing 320.

  In this embodiment, since the motor housing 20 that houses the motor 2 is made of resin, the metal crank housing 320 has a higher thermal conductivity than the motor housing 20. Therefore, the heat generated in the motor 2 can be efficiently radiated by releasing heat to the crank housing 320 having higher thermal conductivity.

  In the present embodiment, a part of the heat transfer member 5 is formed by the fan 25 and is disposed on the path of the cooling air flowing through the second portion 112. Therefore, the heat transfer member 5 can be cooled to some extent by the cooling air flowing through the path. In addition, a part of the first cylinder 341 that is integrally connected and fixed to the crank housing 320 as a heat release destination is exposed to the outside from the opening 105 provided in the outer housing 10. Therefore, the heat released to the crank housing 320 and the first cylinder 341 can be radiated to the outside of the outer housing 10 through the opening 105.

  The correspondence between each component of the above embodiment and each component of the present invention is shown below. The nailing machine 1 is a configuration example corresponding to the “power tool” and “driving tool” of the present invention. The trigger 131 is a configuration example corresponding to the “operation member” of the present invention. The motor 2 and the stator 22 are configuration examples corresponding to the “motor” and “stator” of the present invention, respectively. The drive mechanism 3 and the driver 367 are configuration examples corresponding to the “drive mechanism” and “driver” of the present invention, respectively. The controller 4 is a configuration example corresponding to the “control device” of the present invention. The crank housing 320 is a configuration example corresponding to the “metal member” and the “first housing portion” of the present invention. The heat transfer member 5 is a configuration example corresponding to the “heat transfer member” of the present invention. The curved surface 510 is a configuration example corresponding to the “heat transfer surface” of the present invention. The pressing member 6 is a configuration example corresponding to the “elastic member” of the present invention. The motor housing 20 is a configuration example corresponding to the “second housing portion” of the present invention. The gear housing 310 is a configuration example corresponding to the “third housing portion” of the present invention. The fan 25 is a configuration example corresponding to the “fan” of the present invention. The outer housing 10 is a configuration example corresponding to the “outer housing” of the present invention. The opening 105 is a configuration example corresponding to the “opening” of the present invention.

  The above embodiment is merely an example, and the impact tool according to the present invention is not limited to the configuration of the illustrated nailing machine 1. For example, the changes exemplified below can be added. Note that only one or a plurality of these changes can be adopted in combination with the nailing machine 1 shown in the embodiment or the invention described in each claim.

  A power tool that is configured to perform a preset work operation starting from a manual operation by an operator and that is defined as one cycle from the manual operation to the completion of the work operation is limited to the nailer 1. It is not something that can be done. Examples of such electric tools include a tacker, a staple gun, a screw cutter, a reinforcing bar binding machine, a pruning shears, and the like. The work operation performed during one cycle may be set as appropriate according to the type of the power tool.

  In the nailing machine 1, the configuration and arrangement of the motor 2 and the driving mechanism 3 that performs the nail driving operation may be changed as appropriate. For example, the motor 2 does not need to be a DC motor, and may be an AC motor. In this case, the nail driver 1 may be provided with a power cable connected to an external power source instead of the battery mounting portion 138. Further, the second cylinder 361 of the striking mechanism 36 does not need to be disposed inside the first cylinder 341 of the compression mechanism 34, and the first cylinder 341 and the second cylinder 361 may be arranged in parallel with each other. , May be arranged in directions crossing each other.

  In the above embodiment, the controller 4 pushes the trigger 131 by the operator (switching the trigger switch 132 to the on state) and presses the contact arm 18 against the workpiece (switching the contact arm switch 182 to the on state). ) To start energization of the motor 2. However, the controller 4 may energize the motor 2 with at least the pressing operation of the trigger 131 as a starting point regardless of the pressing state of the contact arm 18.

  The number, shape, material, and connection mode between the motor 2 and the crank housing 320 can be appropriately changed. For example, only one heat transfer member 5 may be disposed. In the above embodiment, the plate member is formed. However, as long as a heat transfer path for releasing heat from the motor 2 to the crank housing 320 can be formed, other shapes such as a rod shape and a string shape may be used. In the said embodiment, although copper is employ | adopted as the heat-transfer member 5, other metal (For example, aluminum) may be sufficient. It is preferable to employ a metal having as high a thermal conductivity as possible. The heat transfer member 5 may be fixed to the stator 22 and the crank housing 320 of the motor 2, or is connected to a metal part other than the stator 22 of the motor 2 and other parts of the crank housing 320 so as to be capable of conducting heat. May be.

  Moreover, it is preferable to urge the heat transfer member 5 against the motor 2 by the pressing member 6 in terms of improving the adhesion between the heat transfer member 5 and the motor 2 (stator 22). However, the motor-side end portion 51 may be inserted between the motor housing 20 and the stator 22 through the opening 201 without being pressed by the pressing member 6 and may be disposed so as to be in surface contact with the stator 22. . Moreover, the shape and arrangement | positioning aspect of the pressing member 6 can be changed suitably.

  The point where the heat transfer member 5 releases the heat of the motor 2 may be a metal member other than the crank housing 320. For example, the heat transfer member 5 may be connected to the motor 2 and the first cylinder 341. For example, when the gear housing 310 is made of metal, it may be connected to the gear housing 310. In the above-described embodiment, the heat transfer member 5 is disposed so that the connection portion 53 contacts the outer surface of the gear housing 310, but the connection portion 53 may be non-contact with the gear housing 310.

1: Nailing machine 10: Outer housing 105: Opening part 106: Vent 11: Main body part 111: First part 112: Second part 13: Handle part 131: Trigger 132: Trigger switch 138: Battery mounting part 15: Nose Portion 150: Injection port 17: Magazine 18: Contact arm 181: Coil spring 182: Contact arm switch 2: Motor 20: Motor housing 201: Opening 205: Vent 22: Stator 25: Fan 3: Drive mechanism 31: Gear reduction mechanism 310: gear housing 32: crank mechanism 320: crank housing 321: crankshaft 323: eccentric pin 325: connecting rod 34: compression mechanism 341: first cylinder 343: first piston 344: pin 345: through hole 348: compression chamber 36 : Stroke mechanism 361: second cylinder 363 Second piston 365: Valve 367: Driver 368: Air chamber 369: Communication path 4: Controller 5: Heat transfer member 51: Motor side end portion 510: Curved surface 52: Crank side end portion 520: Surface 53: Connection portion 6: Presser member 9: battery

Claims (9)

A power tool that is configured to perform a preset work operation starting from a manual operation by an operator, and that is defined as one cycle from the manual operation to the completion of the work operation,
An operation member configured to allow the manual operation;
A motor,
A drive mechanism driven by the power of the motor and configured to perform the work operation;
A controller configured to start driving the motor in response to the manual operation on the operation member, and to stop driving the motor when the driving mechanism completes one cycle of the work operation;
A metal member formed separately from the motor;
A heat transfer member configured to form a heat transfer path different from a power transfer path from the motor to the drive mechanism and to release heat generated by the motor to the metal member. Electric tool to do. The electric tool according to claim 1,
The power tool, wherein the heat transfer member is made of metal. The electric tool according to claim 1 or 2,
The electric tool is configured as a driving tool,
The drive mechanism includes a driver configured to be linearly movable between an initial position and an operating position in a predetermined driving axis direction, and is driven when the driver moves from the initial position to the operating position. The material is driven out, and further, the operation of returning from the operation position to the initial position is performed as the work operation of the one cycle,
A first accommodating portion that accommodates at least a part of the drive mechanism;
The first accommodating portion also serves as the metal member,
The electric power tool, wherein the heat transfer member is connected to the motor and the first housing portion so as to be able to conduct heat. The electric tool according to claim 2,
The electric power tool, wherein the heat transfer member has a heat transfer surface in surface contact with a stator of the motor. The electric tool according to claim 4,
An electric tool, further comprising an elastic member that urges the heat transfer member against the stator. The electric tool according to any one of claims 3 to 5,
A second accommodating portion for accommodating the motor;
The electric power tool, wherein the first housing part is formed of a material having a higher thermal conductivity than the second housing part. The electric tool according to any one of claims 3 to 6,
A third housing part disposed between the first housing part and the motor and housing a part of the drive mechanism;
The third housing part is formed of a material having a lower thermal conductivity than the first housing part,
The electric power tool, wherein the heat transfer member is in contact with the third housing portion. The electric tool according to any one of claims 3 to 7,
A fan driven by the power of the motor and configured to form a flow of cooling air flowing through a predetermined path;
At least a part of the heat transfer member is disposed on the path. The electric tool according to any one of claims 3 to 8,
An outer housing that forms an outer shell of the power tool;
The electric power tool according to claim 1, wherein the outer housing has an opening that exposes at least a part of the first housing portion to the outside.

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