Driving tool

Abstract

To provide a driving tool capable of efficiently cooling an electric material.SOLUTION: A driving tool 1 has a main motor 20 which is a drive source for generating power for moving a driver in a driving direction. The driving tool 1 has a body housing 11 that accommodates the main motor 20. The driving tool 1 has a sub-motor 51 housed in the body housing 11 and driven independently of a main motor 20. The driving tool 1 has a fan 52 that is attached to an output shaft 51a of the sub-motor 51.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a driving tool for driving a driving member into a driven member.

Background Art

[0002] Patent Documents 1 and 2 disclose a gas spring type driving tool that uses the thrust of compressed gas as a driving force. The driving tool includes a driver that strikes a driving member, a lift mechanism that moves the driver to a standby position or a top dead center, and a motor as a driving source for the lift mechanism. The driving tool includes a controller that controls the driving of the motor. The motor, the controller, etc. are installed inside the main body housing of the driving tool. A fan that rotates integrally is attached to the output shaft of the motor. When the fan rotates, cooling air flowing inside the main body housing is generated. The cooling air cools electrical components such as the motor and the controller, for example.

[0003] The motor of the driving tool is driven only when moving the driver to the standby position or moving it to the top dead center. Therefore, the driving time of the motor is short. Therefore, the time during which the fan that rotates integrally with the output shaft of the motor generates cooling air is also short. Therefore, there are cases where electrical components cannot be sufficiently cooled. In addition to the motor and the controller, the driving tool may be provided with electrical components with a large amount of heat generation, such as a solenoid. There was room for improvement in the cooling structure of the driving tool so that electrical components with a large amount of heat generation could also be cooled.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, there is a need for a driving tool that can efficiently cool electrical components.

Means for Solving the Problem

[0006] According to one feature of the present disclosure, the driving tool has a main motor that is a driving source for generating power to move the driver in the driving direction. The driving tool has a main housing that houses the main motor. The driving tool has a sub-motor that is housed in the main housing and is driven independently of the main motor. The driving tool has a fan attached to the output shaft of the sub-motor.

[0007] Therefore, the sub-motor is driven independently of the driving of the main motor. Therefore, the sub-motor can be driven longer than the driving time of the main motor to rotate the fan. Therefore, cooling air can be sent to electrical components such as the main motor and the sub-motor provided in the main housing for a sufficient time. Thereby, the electrical components in the main housing can be efficiently cooled.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

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Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Best Mode for Carrying Out the Invention

[0009] According to another feature of the present disclosure, the driving tool has a controller that transmits a driving signal to the sub-motor so that the sub-motor can be driven even when the main motor stops. Therefore, by driving the sub-motor even when the main motor stops, the time for the cooling air to cool the electrical components can be extended. Thus, the electrical components can be sufficiently cooled.

[0010] According to another feature of the present disclosure, the sub-motor is driven for a longer time than the driving time of the main motor when driving one cycle of the driving operation of the driver. Therefore, by making the driving time of the sub-motor longer than that of the main motor, the cooling efficiency of the electrical components by the cooling air can be increased.

[0011] According to another feature of the present disclosure, the driving tool has a magazine that houses the driving tool. The driving tool has a driver guide that supplies the driving tool from the magazine and guides the driver movably. The sub-motor is provided between the main motor and the magazine. Therefore, the sub-motor can be compactly arranged between the main motor and the magazine. The arrangement of the magazine with respect to the main body housing is set by the position where the driving tool is supplied into the driver guide. Therefore, it is necessary to provide a space between the main motor and the magazine. By arranging the sub-motor using this space, the driving tool can be provided compactly. In addition, the sub-motor can be arranged near the main motor. Therefore, the cooling efficiency of the main motor by the driving of the sub-motor can be increased.

[0012] According to another feature of the present disclosure, the driving tool has a feed pawl that supplies the driving tool from the magazine to the driver guide. The driving tool has a solenoid that moves the feed pawl in a direction opposite to the feed direction. The solenoid is provided between the main motor and the magazine. Therefore, the solenoid is arranged using the space between the main motor and the magazine. Thereby, the driving tool can be provided compactly. In addition, the solenoid can be arranged near the sub-motor. Therefore, the cooling efficiency of the solenoid by the driving of the sub-motor can be increased.

[0013] According to another feature of the present disclosure, the solenoid has a cylindrical holder that houses the coil. In the main body housing, a solenoid cooling passage is provided through which air flows by the drive of the sub-motor so as to penetrate between the coil and the inner peripheral surface of the holder. Therefore, the solenoid cooling passage can be provided so as to directly hit the coil. Moreover, the heated cooling air can be made to flow so as to quickly leave the coil. Therefore, the coil can be efficiently cooled.

[0014] According to another feature of the present disclosure, the output shaft of the sub-motor extends in a direction that intersects the extending direction of the output shaft of the main motor and intersects the driving direction of the driving tool. Therefore, by intersecting the output shaft of the sub-motor with the output shaft of the main motor, the sub-motor including the fan can be arranged compactly with respect to the main motor. By intersecting the output shaft of the sub-motor with the driving direction of the driving tool, it is possible to suppress the driving tool from increasing in size in the driving direction. Therefore, the sub-motor can be arranged compactly.

[0015] According to another feature of the present disclosure, the output shaft of the main motor does not have a fan. In the main body housing, a motor cooling passage is provided through which air flows to the main motor by the drive of the sub-motor. Therefore, in either case when the main motor is driving or stopped, the main motor can be cooled by the sub-motor. Therefore, the cooling efficiency of the main motor can be increased. Further, by not providing a fan on the output shaft of the main motor, the load on the main motor can be reduced.

[0016] According to another feature of the present disclosure, the driving tool has a controller that transmits a driving signal to the main motor and the sub-motor. In the main body housing, a controller cooling passage is provided through which air flows to the controller by the drive of the sub-motor. Therefore, in either case when the main motor is driving or stopped, the controller can be cooled by the sub-motor. Therefore, the cooling efficiency of the controller can be increased.

[0017] According to another feature of the present disclosure, the main body housing is provided with a plurality of cooling passages through which air flows by driving of the sub-motor. The main body housing is provided with an exhaust port for discharging the air flowing through the plurality of cooling passages. The exhaust port is common to the plurality of cooling passages. Therefore, by making the exhaust port common, the air flow in the plurality of cooling passages can be made smooth with less turbulence. As a result, a plurality of electrical components can be efficiently cooled. Further, it is possible to exhaust air from the common exhaust port without impairing the usability of the user who holds the driving tool.

[0018] According to another feature of the present disclosure, the driving tool has a piston to which a driver is connected. The driving tool has a cylinder in which the piston is movably provided. The driver is returned in the counter-driving direction by the main motor, and the gas pressure in the cylinder is increased. Therefore, in a so-called gas spring type driving tool, the cooling efficiency of electrical components such as the main motor by driving of the sub-motor can be improved.

[0019] Next, a first embodiment of the present disclosure will be described with reference to FIGS. 1 to 14. As an example of the driving tool 1, a gas spring type driving tool that uses the gas pressure in the accumulator chamber as the thrust for driving the driving tool is illustrated. In the following description, the driving direction of the driving tool is downward, and the counter-driving direction is upward. The user of the driving tool 1 is generally located on the right side of the driving tool 1 in FIG. 1. The front side of the user is the rear direction, and the back side opposite to the front side is the front direction. The left and right directions are based on the user.

[0020] As shown in FIGS. 2 and 3, the driving tool 1 has a tool body 10 and a main body housing 11 that covers the tool body 10. A cylinder 13 extending in the vertical direction is accommodated in the main body housing 11. A piston 15 is accommodated in the cylinder 13 so as to be reciprocally movable up and down. A driver 16 that is long in the vertical direction is connected to the lower surface of the piston 15. An accumulator chamber 14 is communicated with the upper end of the cylinder 13. Compressed gas such as air is enclosed in the accumulator chamber 14. The gas pressure in the accumulator chamber 14 acts as a thrust for biasing the upper surface of the piston 15 downward.

[0021] As shown in FIGS. 6 and 7, the right part of the accumulator chamber 14 communicates with an air chamber 14a extending downward. The air chamber 14a extends downward along the right side surface of the cylinder 13. The air chamber 14a is provided above the lift mechanism 23 with an overlap in the left-right direction with the lift mechanism 23 to be described later. By providing the air chamber 14a on the right side of the cylinder 13, the capacity of the accumulator chamber 14 including the air chamber 14a can be increased while suppressing the increase in the size of the tool body 10 in the vertical direction.

[0022] As shown in FIGS. 1 to 7, a driving nose portion 2 is provided at the lower part of the tool body 10. The driving nose portion 2 has a driver guide 4 extending generally in the vertical direction. Inside the driver guide 4, driving passages 2a and 2b extending in the vertical direction are provided. The upper driving passage 2b and the lower driving passage 2a communicate with each other. The upper driving passage 2b is formed in a substantially rectangular shape with a size that allows the driver 16 to be inserted in the vertical direction. The upper end of the upper driving passage 2b communicates with the lower part of the cylinder 13. The lower driving passage 2a is formed in a substantially cylindrical shape that is wider than the upper driving passage 2b. The lower driving passage 2a is provided with a diameter that is substantially the same as or slightly larger than that of a substantially cylindrical striker 17 attached to the tip (lower end) 16b of the driver 16. The lower end of the lower driving passage 2a opens downward as a jet outlet 2c.

[0023] As shown in FIGS. 2 to 7, the driving nose portion 2 has a contact arm 3 that contacts the material W to be driven. The contact arm 3 is movable in the vertical direction between a lower position C1 and an upper position C2 with respect to the driver guide 4. The contact arm 3 is biased toward the lower position C1 by a compression spring 41b provided at the front part of the tool body 10. With the lower end of the contact arm 3 in contact with the material W to be driven, the tool body 10 is further moved closer to the material W to be driven. As a result, the contact arm 3 is pushed by the material W to be driven and moves from the lower position C1 to the upper position C2. The lower end of the contact arm 3 moves to a position substantially the same as the jet outlet 2c when at the upper position C2.

[0024] As shown in FIGS. 6 and 7, the lower part of the driver 16 enters the driving passages 2a and 2b. The driver 16 moves downward by the gas pressure in the accumulator chamber 14 acting on the upper surface of the piston 15. The striker 17 attached to the tip 16b of the driver 16 strikes the head na of one driving tool n loaded in the driving passage 2a when it moves to the driving position. The struck driving tool n moves downward in the driving passage 2a and is ejected from the ejection port 2c. The ejected driving tool n is driven into the material W to be driven. A substantially cylindrical cushion 18 for absorbing the impact at the bottom dead center of the piston 15 is provided on the lower inner side of the cylinder 13.

[0025] As shown in FIGS. 6 and 7, a plurality of rack teeth (engaged parts) 16a protruding rightward are provided on the right side of the driver 16. In this embodiment, six rack teeth 16a are arranged side by side in the vertical direction which is the longitudinal direction of the driver 16. Each rack tooth 16a is provided in a substantially triangular shape with the bottom facing downward in the driving direction in a front view. The bottom of the rack tooth 16a engages with the engaging part 25 of the lift mechanism 23.

[0026] As shown in FIGS. 1 to 4, a grip 5 extending rearward and grippable by the user is provided at the rear of the tool body 10. A trigger 6 that the user pulls with a fingertip for operation is provided on the lower front surface of the grip 5. Inside the grip 5, a trigger switch 6a that switches from the off state to the on state in response to the pulling operation of the trigger 6 is provided. When the driving nose portion 2 is pressed against the material W to be driven and moves from the lower position C1 to the upper position C2 (see FIG. 7), the pulling operation of the trigger 6 becomes effective.

[0027] As shown in FIGS. 1 to 4, a battery attachment portion 7 extending in the vertical direction is provided on the rear surface of the grip 5. The battery 8 can be detachably attached to the battery attachment portion 7. The battery 8 can be repeatedly charged with a charger prepared separately after being removed from the battery attachment portion 7. The battery 8 can be diverted as a power source for other power tools. The battery 8 supplies power to the main motor 20 and the like described later.

[0028] As shown in FIGS. 2 to 4, a controller 9 that mainly controls the drive of the main motor 20 is housed in the battery mounting portion 7. The controller 9 is provided with a control board housed in a shallow rectangular box-shaped case. The controller 9 is disposed in front of the battery 8 mounted on the battery mounting portion 7. The controller 9 is disposed in a posture where the longest side extends substantially in the vertical direction and the shortest side extends substantially in the front-rear direction. An air inlet 7a that penetrates inside and outside the battery mounting portion 7 is provided above the controller 9 on the upper surface of the battery mounting portion 7.

[0029] As shown in FIGS. 1 to 4, the main body housing 11 has a substantially cylindrical mechanism case (motor housing) 12 that extends in the front-rear direction below the grip 5. The rear portion of the mechanism case 12 is connected to the lower portion of the battery mounting portion 7. A main motor housing chamber 12a for housing the main motor 20 is provided at the rear portion of the mechanism case 12. A gear portion housing chamber 12m for housing the planetary reduction mechanism 22 is provided in front of the main motor housing chamber 12a. First exhaust ports 12f that penetrate inside and outside are provided on the left and right side surfaces of the gear portion housing chamber 12m. A lifter housing chamber 12n for housing the lift mechanism 23 is provided in front of the gear portion housing chamber 12m. The main motor housing chamber 12a, the gear portion housing chamber 12m, and the lifter housing chamber 12n are arranged in the extending direction of the output axis J that extends in the front-rear direction. The grip 5, the battery mounting portion 7, and the mechanism case 12 cooperate to form a loop shape.

[0030] As shown in FIGS. 2 to 4, the mechanism case 12 has a solenoid housing chamber 12b below the main motor housing chamber 12a and the gear portion housing chamber 12m. A solenoid 36 described later is housed in the solenoid housing chamber 12b. The mechanism case 12 has a sub-motor housing chamber 12i below the main motor housing chamber 12a and the gear portion housing chamber 12m and behind the solenoid housing chamber 12b. A sub-motor 51 described later is housed in the sub-motor housing chamber 12i.

[0031] As shown in FIGS. 2 and 4, the solenoid housing chamber 12b and the sub-motor housing chamber 12i communicate with each other. The solenoid housing chamber 12b and the sub-motor housing chamber 12i are vertically partitioned from the main-motor housing chamber 12a and the gear-unit housing chamber 12m by the lower surfaces of the main-motor housing chamber 12a and the gear-unit housing chamber 12m. The rear portion of the solenoid housing chamber 12b communicates with the main-motor housing chamber 12a through a communication passage 12h provided behind the main-motor housing chamber 12a via the sub-motor housing chamber 12i. The lower portion of the battery mounting portion 7 also communicates with the main-motor housing chamber 12a and the sub-motor housing chamber 12i through the communication passage 12h. The main-motor housing chamber 12a communicates with the gear-unit housing chamber 12m in the front-rear direction.

[0032] As shown in FIGS. 1 to 4, the solenoid housing chamber 12b is provided in a substantially rectangular box shape. The solenoid 36 is housed in the front portion of the solenoid housing chamber 12b. The plunger 36a of the solenoid 36 extends in a direction inclined downward toward the front with respect to the output axis J. The solenoid housing chamber 12b has a first wall 12c on the front side facing the driving nose portion 2 and a second wall 12d on the lower side facing the magazine 26 described later. The plunger 36a projects out of the solenoid housing chamber 12b from the center of the first wall 12c. An air inlet 12e penetrating the solenoid housing chamber 12b inside and outside is provided in the second wall 12d. The air inlet 12e is arranged vertically aligned with the solenoid 36. The specific configuration of the solenoid 36 will be described in detail later.

[0033] As shown in FIGS. 2 and 3, the main motor 20 has an output shaft 20a extending in the front-rear direction on the output axis J. The rear portion of the output shaft 20a is rotatably supported by a bearing 20b. The front portion of the output shaft 20a is rotatably supported by a bearing (not shown) in the planetary reduction mechanism 22. A fan 21 is attached to the front portion of the output shaft 20a behind the planetary reduction mechanism 22. By rotating the fan 21 integrally with the output shaft 20a, cooling air flows from the rear to the front in the main-motor housing chamber 12a. Three rows of planetary gear trains are used in the planetary reduction mechanism 22. The rotational drive of the output shaft 20a of the main motor 20 is decelerated by the planetary reduction mechanism 22 and transmitted to the lift mechanism 23.

[0034] As shown in FIGS. 6 and 7, the lift mechanism 23 is provided on the right side of the driving nose portion 2. The lift mechanism 23 moves the driver 16 and the piston 15 upward against the air pressure in the accumulator chamber 14. The lift mechanism 23 has a wheel 24 that is rotatable about the output axis J. The wheel 24 is rotatable counterclockwise when viewed from the front, and its rotation in the clockwise direction is restricted. A plurality of engaging portions 25 are provided along the outer peripheral edge of the wheel 24. In this embodiment, for example, six engaging portions 25 are arranged at intervals in the circumferential direction of the wheel 24. For the engaging portion 25, for example, a columnar pin extending in the front-rear direction is used. As the wheel 24 rotates, each engaging portion 25 moves about the output axis J.

[0035] As shown in FIGS. 6 and 7, the left part of the wheel 24 enters the driving passage 2b of the driver guide 4 through a window portion 12p provided in the left part of the lifter housing chamber 12n. Each engaging portion 25 of the wheel 24 engages with the bottom of the rack teeth 16a of the driver 16 in the driving passage 2b. With at least one of the engaging portions 25 engaged with the bottom of any of the rack teeth 16a, the wheel 24 rotates counterclockwise when viewed from the front. As a result, the driver 16 and the piston 15 move upward. The upward movement of the piston 15 increases the gas pressure in the accumulator chamber 14.

[0036] As shown in FIG. 4, a dial-type adjuster 41 is provided at the front part of the driving nose portion 2. The adjuster 41 has a rotary shaft 41a extending in the vertical direction. The rotary shaft 41a is integrally rotatable with the adjuster 41 and movable in the vertical direction. An adjuster connecting portion 3a connected to the adjuster 41 is provided at the upper part of the contact arm 3. The contact arm 3 is integrally movable in the vertical direction with the adjuster 41. By rotating the adjuster 41 about its axis, the vertical position of the contact arm 3 can be adjusted. The adjuster 41 has a compression spring 41b disposed on the outer peripheral side of the rotary shaft 41a and supported by the main body housing 11. The compression spring 41b biases the adjuster 41 and the contact arm 3 downward. Therefore, the contact arm 3 is normally located at the lower position C1.

[0037] As shown in FIG. 4, a contact plate 42 is integrally connected to the upper part of the adjuster 41. Above the contact plate 42, a plate-shaped spring 43 and a switch 44 are provided. When the contact arm 3 moves from the lower position C1 to the upper position C2 (see FIG. 7), the contact plate 42 also moves upward via the adjuster 41. The upper end of the contact plate 42 presses the protruding pin 44a of the switch 44 via the spring 43. Thereby, the switch 44 is turned on and transmits an on-signal to the controller 9. When an on-signal is transmitted to the controller 9, the pulling operation of the trigger 6 becomes effective. When the contact arm 3 is at the lower position C1, the contact plate 42 does not move upward and the protruding pin 44a of the switch 44 is not pressed. Therefore, the switch 44 does not transmit an on-signal and the pulling operation of the trigger 6 is not effective.

[0038] As shown in FIGS. 1 to 4, a substantially cylindrical magazine 26 is provided behind the driving nose portion 2. The magazine 26 is provided in a posture with its substantially cylindrical axial direction generally oriented in the vertical direction. The magazine 26 is provided with a split structure of a right portion 26a and a left portion 26b. A support shaft 26c is provided between the left end of the lower surface of the right portion 26a and the right end of the lower surface of the left portion 26b. The left portion 26b can be opened and closed by rotating about the support shaft 26c with respect to the right portion 26a. By opening the left portion 26b, a connected driving tool N in which a plurality of driving tools n are connected can be loaded into the magazine 26. By closing the left portion 26b, the connected driving tool N can be held in the magazine 26. The driver guide 4 has a flat feed guide portion 4a extending rearward from the driving nose portion 2. The front portion of the right portion 26a of the magazine 26 is connected to and supported by the feed guide portion 4a. The rear portion of the right portion 26a of the magazine 26 is connected to and supported by a region behind the mechanism case 12 of the main body housing 11.

[0039] As shown in FIGS. 8 to 10, a connected driving tool N so-called a coil nail has a plurality of driving tools n and a connecting member m for connecting each driving tool n. The driving tool n is, for example, a nail having a circular head na. The connecting member m is, for example, a wire made of metal. The connecting member m connects the plurality of driving tools n in a state where they are arranged at a predetermined interval in a direction substantially orthogonal to the longitudinal direction. The connected driving tool N is housed in the magazine 26 in a state of being wound in a spiral shape. The driving tool n at one end of the connected driving tool N is guided forward from the magazine 26 and held by a feed mechanism 30 provided between the magazine 26 and the driving nose portion 2.

[0040] As shown in FIGS. 8 to 13, the feeding mechanism 30 has a feed pawl 31 that feeds the driving tool n forward toward the driving passage 2a. The feeding mechanism 30 has a biasing member 32 that biases the feed pawl 31 forward. The biasing member 32 is, for example, a coil-shaped compression spring. A spring receiving portion 26d for holding the rear end of the compression spring 32 is provided at the front portion of the right portion 26a of the magazine 26. The feeding mechanism 30 has a solenoid 36 that moves the feed pawl 31. Power is supplied from the battery 8 to the solenoid 36 or cut off in response to a signal from the controller 9 (see FIG. 2). When the solenoid 36 is in the off state where power supply is cut off, the feed pawl 31 is biased forward toward the driving passage 2a side by the compression spring 32. When power is supplied to the solenoid 36 and it is in the on state, the feed pawl 31 moves rearward toward the magazine 26 side against the biasing force of the compression spring 32.

[0041] As shown in FIG. 2, the solenoid 36 is housed in a solenoid housing chamber 12b provided in the mechanism case 12 above the magazine 26. In other words, the solenoid 36 is not provided in the magazine 26 and is not provided in the feeding passage of the driving tool n formed between the magazine 26 and the driver guide 4 in the front-rear direction.

[0042] As shown in FIGS. 8 to 10 and 14, the solenoid 36 has a rectangular box-shaped holder 36c and a plunger 36a that projects forward from the holder 36c. A through hole through which the plunger 36a is inserted is provided on the front surface of the holder 36c. The lower and upper surfaces of the holder 36c are open. A coil 36b is housed in the holder 36c. The plunger 36a is inserted through the coil 36b. The coil 36b is adjacent to an air intake port 12e provided on the second wall 12d of the solenoid housing chamber 12b.

[0043] As shown in Figs. 8 to 10 and 14, the feeding mechanism 30 has a power transmission member 35 that moves by driving a solenoid 36. The feeding claw 31 moves in the front-rear direction in conjunction with the movement of the power transmission member 35. The power transmission member 35 is provided on a plate-like member that extends generally in the vertical direction. At the upper end of the power transmission member 35, a rotation support portion 35a that is the rotation center of the power transmission member 35 is provided. The rotation support portion 35a is rotatably supported by the driver guide 4 via a shaft member that extends in the left-right direction.

[0044] As shown in Figs. 8 to 10 and 14, at the lower end of the power transmission member 35, a claw connection portion 35c that is connected to the rear portion of the feeding claw 31 is provided. On the rear surface of the claw connection portion 35c, a spring receiving portion 35d that receives the front end of the compression spring 32 is provided. The power transmission member 35 and the feeding claw 31 are biased forward by the compression spring 32 via the spring receiving portion 35d. The power transmission member 35 has a thick portion 35e behind the claw connection portion 35c. The thick portion 35e is provided to be thicker in the front-rear direction than the claw connection portion 35c. By providing the thick portion 35e, the rigidity of the power transmission member 35 can be improved against the biasing force of the compression spring 32 and the driving force of the solenoid 36.

[0045] As shown in Figs. 8 to 10 and 14, the power transmission member 35 has a plunger connection portion 35b that is connected to the front end of the plunger 36a. The plunger connection portion 35b is provided midway between the rotation support portion 35a and the claw connection portion 35c in the vertical direction. For example, the distance from the rotation support portion 35a to the plunger connection portion 35b is approximately half of the distance from the rotation support portion 35a to the claw connection portion 35c. Therefore, the movement amount of the plunger 36a is approximately half of the movement amount of the feeding claw 31.

[0046] As shown in FIGS. 10 to 14, the left end of the feed pawl 31 is provided in a substantially U shape. A feed inclined surface 31a is provided at the front portion of the left end of the feed pawl 31. The feed inclined surface 31a is provided so as to incline forward as it goes leftward with the left rearward as the perpendicular direction. A receiving surface 31b facing the feed inclined surface 31a is provided at the rear portion of the left end of the feed pawl 31. The receiving surface 31b extends substantially horizontally in the left-right direction with the front as the perpendicular direction. The lower right portion of the feed pawl 31 is rotatably connected to a pawl connecting portion 35c of a power transmission member 35 via a rotary support shaft 31c extending in the vertical direction. The feed pawl 31 has a torsion spring 31d that biases the feed pawl 31 about the axis of the rotary support shaft 31c. The torsion spring 31d biases the feed pawl 31 in the clockwise direction when viewed from below.

[0047] As shown in FIGS. 8 to 13, the feed mechanism 30 has a check pawl 33 that prevents the driving tool n fed forward by the feed pawl 31 from returning rearward from the driving passage 2a. A check inclined surface 33a is provided at the front portion of the check pawl 33. The check inclined surface 33a is provided so as to incline forward as it goes rightward with the right rearward as the perpendicular direction. A plate-like guide member 34 extending in the front-rear direction and the vertical direction is provided between the driving passage 2a and the magazine 26 in the front-rear direction. The guide member 34 extends substantially parallel to the feed guide portion 4a on the left side of the feed guide portion 4a. The lower portion of the check pawl 33 is rotatably connected to the guide member 34 via a rotary support shaft 33b extending in the vertical direction. The check pawl 33 is biased in the counterclockwise direction when viewed from below by a spring (not shown).

[0048] As shown in FIG. 1, a feed passage for feeding the driving tool n from the magazine 26 to the driving passage 2a is formed between the feed guide portion 4a and the guide member 34 in the left-right direction. The feed pawl 31 is inserted into a hole 4b penetrating the feed guide portion 4a in the left-right direction and protrudes from the right side to the left side toward the feed passage. The check pawl 33 is inserted into a hole 34a penetrating the feed guide portion 4a in the left-right direction and protrudes from the left side to the right side toward the feed passage (see FIG. 9).

[0049] As shown in FIGS. 1 and 2, the sub-motor housing chamber 12i for housing the sub-motor 51 is provided in a substantially cylindrical shape with the left-right direction as the axial direction. The output shaft 51a of the sub-motor 51 extends in the left-right direction on an output axis K that is substantially orthogonal to the output axis J and also substantially orthogonal to the driving-in direction. The sub-motor 51 is provided between the main motor 20 and the magazine 26 in the up-down direction. It is necessary to provide a space between the main motor 20 and the magazine 26 in the up-down direction in order to provide a mechanism for loading the moving amount of the driver 16 and the driving tool n. The sub-motor 51 is compactly arranged in the up-down direction by utilizing this space. The sub-motor 51 protrudes rightward to approximately follow the right ends of the lift mechanism 23 and the magazine 26 (see FIG. 5). By suppressing the amount of protrusion of the sub-motor 51 to the right, it is possible to suppress the increase in the size of the driving tool 1 in the left-right direction. A bearing 51b is provided at the right end of the output shaft 51a of the sub-motor 51. A fan 52 is attached to the right part of the sub-motor 51 and to the left of the bearing 51b.

[0050] As shown in FIGS. 1 and 2, a disk-shaped cover 53 is attached to the right end of the sub-motor housing chamber 12i so as to cover the right side of the fan 52. A second exhaust port 12g is provided between the sub-motor housing chamber 12i and the cover 53. The second exhaust port 12g is provided radially outward of the lower region of the fan 52. The exhaust is discharged downward from the second exhaust port 12g.

[0051] As shown in FIG. 4, a conical tapered surface 12j is provided to the left of the sub-motor housing chamber 12i so as to cover the left side of the fan 52. A circular hole 12k penetrating in the left-right direction is provided at the center of the tapered surface 12j. The solenoid housing chamber 12b and the sub-motor housing chamber 12i communicate with each other in the left-right direction through the hole 12k. By providing the tapered surface 12j and the hole 12k, the momentum of the cooling air generated by the rotation of the fan 52 can be increased.

[0052] Next, a series of processes of the driving operation of the driving tool 1 will be described with reference to FIGS. 3 to 13. FIGS. 3, 6, 8, and 11 show the state where the driver 16 is moved upward to the standby position and before the driving tool n is loaded into the driving passage 2a. FIGS. 7, 10, and 13 show the state when the driving tool n is loaded into the driving passage 2a. The driver 16 at the standby position stops slightly below the top dead center. When the driver 16 is at the standby position, the bottom surface of the second rack tooth 16a from the bottom and the engaging portion 25 one before (counterclockwise side in the figure) the final engaging portion 25a of the lift mechanism 23 are engaged.

[0053] When the contact arm 3 is pressed against the workpiece W, it moves from the lower position C1 to the upper position C2. The contact plate 42 connected to the adjuster 41 in conjunction with the contact arm 3 moves upward. When the contact plate 42 moves upward, the protruding pin 44a of the switch 44 is pushed through the spring 43. The switch 44 transmits an on-signal to the controller 9. The controller 9 starts the main motor 20 when it receives the on-signal from the switch 44 and the trigger 6 is pulled. When the main motor 20 is started, the wheel 24 of the lift mechanism 23 rotates. As a result, the rack tooth 16a engaged with the engaging portion 25 moves upward, and the driver 16 moves upward from the standby position to the top dead center.

[0054] Before the driver 16 moves upward from the standby position to the top dead center, the foremost one driving tool n is loaded into the driving passage 2a by the feeding mechanism 30. Just before the lower end of the striker 17 attached to the tip 16b of the driver 16 moves upward beyond the head na of the driving tool n (see FIG. 9), power is supplied to the solenoid 36. The plunger 36a moves rearward together with the plunger connecting portion 35b of the power transmission member 35. The power transmission member 35 rotates rearward about the rotary support portion 35a. The feed claw 31 moves rearward against the biasing force of the compression spring 32 in conjunction with the rearward movement of the claw connecting portion 35c of the power transmission member 35.

[0055] When the feed pawl 31 moves rearward, it is pushed by the driving tool n held by the feed inclined surface 31a of the feed pawl 31. Therefore, the feed pawl 31 retracts rightward away from the driving tool n against the biasing force of the torsion spring 31d. When the plunger 36a moves to the rearmost position, the feed pawl 31 is biased by the torsion spring 31d and rotates leftward to the position where the driving tool n is located. As a result, the second driving tool n from the front is sandwiched between the feed inclined surface 31a and the receiving surface 31b of the feed pawl 31. The foremost driving tool n is located immediately behind the striker 17 and is held by the front surface of the check pawl 33 so as not to move rearward.

[0056] At the timing when the lower end of the striker 17 moves upward from the head na of the driving tool n (see Fig. 9), the power to the solenoid 36 is cut off. The power transmission member 35 is biased by the compression spring 32 and rotates forward about the rotation support portion 35a. The feed pawl 31 moves forward while sandwiching the second driving tool n from the front. The check pawl 33 is pushed by the driving tool n moving forward from the rear and retracts leftward away from the driving tool n against the biasing force of the spring. Therefore, the feed pawl 31 can smoothly move the connected driving tool N including the sandwiched driving tool n forward. By moving the connected driving tool N forward, the foremost driving tool n can be loaded into the driving passage 2a before the driver 16 moves to the top dead center. The check pawl 33 is biased by the spring and rotates rightward to the position where the driving tool n is located. Thereby, it is possible to restrict the connected driving tool N from returning rearward to the magazine 26 side.

[0057] When the driver 16 moves upward to the top dead center and reaches the state just before driving, the final engaging portion 25a is disengaged from the bottom of the lowermost rack tooth 16a due to the rotation of the wheel 24. The driver 16 is urged downward by the gas pressure in the accumulator chamber 14 that was applied to the piston 15. The striker 17 strikes the head na of the driving tool n in the driving passage 2a. The struck driving tool n is ejected from the ejection port 2c toward the material W to be driven. The connecting member m that connects the ejected driving tools n is sheared by the impact when the driver 16 strikes. When the driver 16 moves downward, all the engaging portions 25 are retracted to the right of the driving passage 2b. Therefore, interference between the rack teeth 16a of the downward-moving driver 16 and the engaging portions 25 is avoided, and a smooth driving operation is performed.

[0058] The wheel 24 continues to rotate even while the driver 16 is moving downward and after reaching the bottom dead center. When the driver 16 is at the bottom dead center and the wheel 24 rotates by a predetermined rotation angle, one of the engaging portions 25 engages with the bottom of the uppermost rack tooth 16a. Thereby, the return operation to move the driver 16 upward is started. The next driving tool n of the ejected driving tools n is sandwiched between the feed inclined surface 31a and the receiving surface 31b of the feed pawl 31 and held by the front surface of the check pawl 33. Thereby, the next driving tool n is positioned immediately behind the driving passage 2a. An arcuate surface 17a that follows the shape of the head na of the driving tool n is provided on the rear surface of the striker 17. The interference between the striker 17 and the head na of the next driving tool n can be suppressed by the arcuate surface 17a. Therefore, the next driving tool n can be held at a position as close as possible to the driving passage 2a.

[0059] When the wheel 24 rotates and one of the engaging portions 25 in front of the final engaging portion 25a engages with the bottom of the second-lowermost rack tooth 16a from the bottom, the driver 16 returns to the standby position. For example, by appropriately measuring the time from the start of activation of the main motor 20, or by appropriately measuring the rotational position of the wheel 24, the main motor 20 is stopped when the piston 15 reaches the standby position. Thereby, the driver 16 is held at the standby position. Thus, a series of driving operations is completed.

[0060] Referring to FIGS. 2 and 4, the flow of the cooling air in the main housing 11 will be described. When the main motor 20 is activated, the fan 21 rotates integrally with the output shaft 20a. Cooling air flowing from the rear to the front is generated in the main motor housing chamber 12a of the mechanism case 12. Due to the rotation of the fan 21, a negative pressure is generated inside the battery mounting portion 7 and the cooling air flows. When the sub-motor 51 is activated, the fan 52 rotates integrally with the output shaft. Cooling air flowing from the left to the right is generated in the sub-motor housing chamber 12i. Due to the rotation of the fan 52, a negative pressure is generated inside the solenoid housing chamber 12b and the battery mounting portion 7, and the cooling air flows.

[0061] The sub-motor 51 is driven independently of the drive of the main motor 20. The timing at which the sub-motor 51 is activated can be set arbitrarily. For example, power may be supplied to the sub-motor 51 when the trigger 6 is pulled. For example, power may be supplied to the sub-motor 51 when it is detected that the contact arm 3 has moved to the upper position C2 (see FIG. 7). For example, the power supply to the sub-motor 51 may be configured to be cut off after a predetermined time from the start of the supply. The sub-motor 51 can be driven for a longer time than the main motor 20, for example, when the main motor 20 performs one cycle of driving operation.

[0062] First, outside air is taken in as cooling air from the intake port 12e of the second wall 12d into the solenoid housing chamber 12b. The cooling air passes between the coil 36b (see FIG. 14) of the solenoid 36 and the inner peripheral surface of the holder 36c to cool the coil 36b. The cooling air passes through the air passage (solenoid cooling passage) A1 that flows toward the sub-motor housing chamber 12i on the rear right side through the hole 12k. The cooling air passing through the air passage A1 heads toward the fan 52 and is further discharged outward from the second exhaust port 12g by the rotation of the fan 52.

[0063] Inside the battery attachment part 7, first, outside air is taken in as cooling air from the intake port 7a at the upper end. The cooling air passes near the controller 9 and further flows through the air passage (controller cooling passage) A3 that leads to the lower communication passage 12h. The controller 9 is cooled by the cooling air passing through the air passage A3. The cooling air passing through the air passage A3 flows from the communication passage 12h into the sub-motor housing chamber 12i through the hole 12k. The cooling air that has flowed into the sub-motor housing chamber 12i is discharged outward from the second exhaust port 12g by the rotation of the fan 52. A part of the cooling air passing through the air passage A3 branches off at the communication passage 12h and flows through the air passage (motor cooling passage) A2 that leads to the main-motor housing chamber 12a. The main motor 20 is cooled by the cooling air passing through the air passage A2. The cooling air is discharged outward from the first exhaust port 12f of the gear part housing chamber 12m.

[0064] As described above, the driving tool 1 has a main motor 20 which is a driving source that generates power for moving the driver 16 (see FIGS. 6 and 7) in the driving direction as shown in FIGS. 1 and 2. The driving tool 1 has a main body housing 11 that houses the main motor 20. The driving tool 1 has a sub-motor 51 that is housed in the main body housing 11 and is driven independently of the main motor 20. The driving tool 1 has a fan 52 attached to the output shaft 51a of the sub-motor 51.

[0065] Therefore, the sub-motor 51 is driven independently of the driving of the main motor 20. Thus, the sub-motor 51 can be driven for a longer time than the driving time of the main motor 20 to rotate the fan 52. Therefore, cooling air can be sent to electrical components such as the main motor 20 and the sub-motor 51 provided in the main body housing 11 for a sufficient time. Thereby, the electrical components in the main body housing 11 can be cooled efficiently.

[0066] As shown in FIG. 2, the driving tool 1 has a controller 9 that transmits a driving signal to the sub-motor 51 so that the sub-motor 51 can be driven even when the main motor 20 stops. Therefore, by driving the sub-motor 51 even when the main motor 20 stops, the time for the cooling air to cool the electrical components can be extended. Thus, the electrical components can be sufficiently cooled.

[0067] As shown in FIGS. 8 to 10, the sub-motor 51 is driven for a longer time than the driving time of the main motor 20 when driving one cycle of the driving operation of the driver 16. Therefore, by making the driving time of the sub-motor 51 longer than that of the main motor 20, the cooling efficiency of the electrical components by the cooling air can be improved.

[0068] As shown in FIGS. 8 to 10, the driving tool 1 has a magazine 26 that houses the driving tool n. The driving tool 1 has a driver guide 4 that is supplied with the driving tool n from the magazine 26 and guides the driver 16 movably. The sub-motor 51 is provided between the main motor 20 and the magazine 26. Therefore, the sub-motor 51 can be compactly arranged between the main motor 20 and the magazine 26. The arrangement of the magazine 26 with respect to the main body housing 11 is set by the position where the driving tool n is supplied into the driver guide 4. Therefore, it is necessary to provide a gap between the main motor 20 and the magazine 26. By arranging the sub-motor 51 using this gap, the driving tool 1 can be provided compactly. Also, the sub-motor 51 can be arranged near the main motor 20. Therefore, the cooling efficiency of the main motor 20 by the driving of the sub-motor 51 can be improved.

[0069] As shown in FIGS. 2, 8 to 10, the driving tool 1 has a feed pawl 31 that supplies the driving tool n from the magazine 26 to the driver guide 4. The driving tool 1 has a solenoid 36 that moves the feed pawl 31 in a direction opposite to the feed direction. The solenoid 36 is provided between the main motor 20 and the magazine 26. Therefore, the solenoid 36 is arranged by utilizing the space between the main motor 20 and the magazine 26. Thereby, the driving tool 1 can be provided in a compact manner. Also, the solenoid 36 can be arranged near the sub-motor 51. Therefore, the cooling efficiency of the solenoid 36 due to the driving of the sub-motor 51 can be enhanced.

[0070] As shown in FIG. 2, the solenoid 36 has a cylindrical holder 36c that houses a coil 36b (see FIG. 14). In the main body housing 11, an air passage (solenoid cooling passage) A1 is provided through which air flows so as to penetrate between the coil 36b and the inner peripheral surface of the holder 36c by the driving of the sub-motor 51. Therefore, the air passage A1 can be provided so as to directly hit the coil 36b. Moreover, the heated cooling air can be made to flow so as to quickly leave the coil 36b. Therefore, the coil 36b can be efficiently cooled.

[0071] As shown in FIG. 2, the output shaft 51a of the sub-motor 51 extends in a direction that intersects the extending direction of the output shaft 51a of the main motor 20 and also intersects the driving direction of the driving tool n. Therefore, by intersecting the output shaft 51a of the sub-motor 51 with the output shaft 51a of the main motor 20, the sub-motor 51 including the fan 52 can be arranged compactly with respect to the main motor 20. By intersecting the output shaft 51a of the sub-motor 51 with the driving direction of the driving tool n, it is possible to suppress the driving tool 1 from becoming larger in the driving direction. Therefore, the sub-motor 51 can be arranged compactly.

[0072] As shown in Fig. 2, the driving tool 1 has a controller 9 that transmits drive signals to the main motor 20 and the sub-motor 51. An air passage (controller cooling passage) A3 through which air flows to the controller 9 by the drive of the sub-motor 51 is provided in the main housing 11. Therefore, the controller 9 can be cooled by the sub-motor 51 whether the main motor 20 is driving or stopped. Thus, the cooling efficiency of the controller 9 can be enhanced.

[0073] As shown in Figs. 6 and 7, the driving tool 1 has a piston 15 to which a driver 16 is connected. The driving tool 1 has a cylinder 13 in which the piston 15 is movably provided. The driver 16 is returned in the reverse driving direction by the main motor 20, and the gas pressure in the cylinder 13 is increased. Therefore, in the so-called gas spring type driving tool 1, the cooling efficiency of electrical components such as the main motor 20 by the drive of the sub-motor 51 can be enhanced.

[0074] Next, a second embodiment of the present disclosure will be described with reference to Figs. 15 and 16. A mechanism case (motor housing) 61 is provided in the main housing 11 of the driving tool 60 of the second embodiment instead of the mechanism case 12 shown in Fig. 1. In the following description, only the parts different from the first embodiment will be described in detail. The mechanism case 61 is provided in a substantially cylindrical shape extending in the front-rear direction below the grip 5. The mechanism case 61 has a main motor housing chamber 61a, a gear portion housing chamber 61m, a lifter housing chamber 61n, a solenoid housing chamber 61b, a sub-motor housing chamber 61i, and a communication passage 61h. These configurations are provided in the same manner as the main motor housing chamber 12a, the gear portion housing chamber 12m, the lifter housing chamber 12n, the solenoid housing chamber 12b, the sub-motor housing chamber 12i, and the communication passage 12h of the mechanism case 12 shown in Fig. 2.

[0075] As shown in FIGS. 15 and 16, the solenoid 36 is housed in the front part of a solenoid housing chamber 61b formed in a substantially rectangular box shape. The plunger 36a of the solenoid 36 extends in a direction inclined downward toward the front with respect to the output axis J. The solenoid housing chamber 61b has a first wall 61c on the front side facing the driving nose portion 2 and a second wall 61d on the lower side facing the magazine 26. The plunger 36a projects out of the solenoid housing chamber 61b from the center of the first wall 61c. A first air inlet 61e penetrating the solenoid housing chamber 61b inside and outside is provided in the second wall 61d. The first air inlet 61e is arranged side by side with the solenoid 36 vertically. Second air inlets 61f penetrating inside and outside are provided on the left and right side surfaces of the gear portion housing chamber 61m.

[0076] As shown in FIGS. 15 and 16, the sub-motor housing chamber 61i is provided in a substantially cylindrical shape with the left-right direction as the axial direction. The output shaft 51a of the sub-motor 51 extends in the left-right direction on an output axis K that is substantially orthogonal to the output axis J and also substantially orthogonal to the driving direction. A fan 52 is attached to the right part of the sub-motor 51 and to the left of the bearing 51b. On the other hand, no fan is attached to the output shaft 20a of the main motor 20. A disk-shaped cover (not shown) covering the right side of the fan 52 is attached to the right end of the sub-motor housing chamber 61i. An exhaust port 61g is provided between the sub-motor housing chamber 61i and the cover. The exhaust port 61g is provided radially outward in the lower region of the fan 52. The exhaust is discharged downward from the exhaust port 61g.

[0077] As shown in FIG. 16, a conical tapered surface 61j is provided to the left of the sub-motor housing chamber 61i so as to cover the left side of the fan 52. A circular hole 61k penetrating in the left-right direction is provided at the center of the tapered surface 61j. The solenoid housing chamber 61b and the sub-motor housing chamber 61i communicate with each other in the left-right direction through the hole 61k.

[0078] Referring to FIGS. 15 and 16, the flow of the cooling air in the main housing 11 will be described. When the sub-motor 51 is activated, the fan 52 rotates integrally with the output shaft. Cooling air flowing from left to right is generated in the sub-motor housing chamber 61i. On the other hand, since no fan is attached to the main motor 20, no cooling air is generated when the main motor 20 is activated. Due to the rotation of the fan 52, negative pressure is generated inside the solenoid housing chamber 61b and the battery mounting portion 7, and the cooling air flows. The sub-motor 51 is supplied with power, for example, when power is supplied to the solenoid 36, and is driven independently of the main motor 20. The sub-motor 51 stops, for example, after a predetermined time from when the power supply to the solenoid 36 is cut off. The sub-motor 51 can be driven for a longer time than the main motor 20, for example, when the main motor 20 performs one cycle of driving operation.

[0079] First, outside air is taken into the solenoid housing chamber 61b as cooling air through the first air inlet 61e of the second wall 61d. The cooling air passes between the coil 36b (see FIG. 14) of the solenoid 36 and the inner peripheral surface of the holder 36c to cool the coil 36b. The cooling air passes through the air passage (solenoid cooling passage) A1 that flows toward the rear right sub-motor housing chamber 61i through the hole 61k. The cooling air passing through the air passage A1 heads toward the fan 52 and is further discharged outward from the exhaust port 61g by the rotation of the fan 52.

[0080] First, outside air is taken into the main motor housing chamber 61a as cooling air through the second air inlet 61f of the gear portion housing chamber 12m. The cooling air passes through the air passage (motor cooling passage) A2 that flows from the inside of the main motor housing chamber 61a toward the rear communication passage 61h. The main motor 20 is cooled by the cooling air passing through the air passage A2. The cooling air passing through the air passage A2 flows from the communication passage 61h to the sub-motor housing chamber 61i through the hole 61k. The cooling air flowing into the sub-motor housing chamber 61i is discharged outward from the exhaust port 61g by the rotation of the fan 52.

[0081] Inside the battery attachment part 7, first, outside air is taken in as cooling air from the intake port 7a at the upper end. The cooling air passes near the controller 9 and further flows through an air passage (controller cooling passage) A3 that leads to the lower communication passage 61h. The controller 9 is cooled by the cooling air passing through the air passage A3. The cooling air passing through the air passage A3 flows from the communication passage 61h into the sub-motor housing chamber 61i through the hole 61k. The cooling air that has flowed into the sub-motor housing chamber 61i is discharged outward from the exhaust port 61g by the rotation of the fan 52. Thus, all of the cooling air that cools the solenoid 36, the main motor 20, and the controller 9 is discharged from the common exhaust port 61g provided in the sub-motor housing chamber 61i.

[0082] As described above, the output shaft 20a of the main motor 20 does not have a fan as shown in FIG. 15. In the main body housing 11, an air passage (motor cooling passage) A2 is provided through which air flows to the main motor 20 by the drive of the sub-motor 51 (see FIG. 16). Therefore, the main motor 20 can be cooled by the sub-motor 51 whether the main motor 20 is driving or stopped. Thus, the cooling efficiency of the main motor 20 can be enhanced. Also, by not providing a fan on the output shaft 20a of the main motor 20, the load on the main motor 20 can be reduced.

[0083] As shown in FIG. 15, in the main body housing 11, a plurality of cooling passages A1, A2, A3 through which air flows by the drive of the sub-motor 51 are provided. In the main body housing 11, an exhaust port 61g for discharging the air flowing through the plurality of cooling passages A1, A2, A3 is provided. The exhaust port 61g is common to the plurality of cooling passages A1, A2, A3. Therefore, by making the exhaust port 61g common, the air flow through the plurality of cooling passages A1, A2, A3 can be made into a smooth flow with less turbulence. Thereby, a plurality of electrical components can be efficiently cooled. Also, it is possible to exhaust air from the common exhaust port 61g without impairing the usability of the user who grips the driving tool 60.

[0084] Various modifications can be made to the driving tools 1, 50, 60, and 70 of each of the embodiments described above. A gas spring type driving tool has been exemplified. Instead of this, for example, the present disclosure may be applied to a mechanical spring type driving tool that injects a driver by utilizing a spring force such as a mechanical compression spring generated when moving a driver in the counter-driving direction with a lift mechanism. For example, the present disclosure may be applied to a flywheel type driving tool that injects a driver by utilizing the inertial force of a flywheel. For example, the present disclosure may be applied to an electro-pneumatic type driving tool that utilizes compressed air generated by rotating a crank with an electric motor.

[0085] The position where the sub-motor 51 is provided is not limited to the exemplified one and may be appropriately changed. For example, there may be cases where it is difficult to arrange the sub-motor 51 between the main motor 20 and the magazine 26, or cases where the solenoid 36 for sending the driving tool n to the driver guide 4 is not provided. In such cases, for example, the sub-motor 51 and the sub-motor housing chamber 12i may be provided near the communication passage 12h below the controller 9 and behind the main motor 20. A configuration in which the controller 9 is provided in front of the battery 8 at the battery mounting portion 7 has been exemplified. Instead of this, for example, the controller 9 may be arranged near the sub-motor 51 so as to enter the solenoid housing chamber 12b. By bringing the controller 9 closer to the sub-motor 51, the cooling effect of the controller 9 by rotating the fan 52 with the sub-motor 51 can be enhanced.

[0086] For example, the sub-motor 51 can also be applied to a driving tool that does not require the solenoid 36 to send the driving tool n from the magazine 26 to the driving passage 2a. Even when the solenoid 36 is not provided, the driving time of the main motor 20 of the driving tool 1 is short. Therefore, the cooling effect by rotating the fan 52 with the sub-motor 51 is sufficient. In the case of the present disclosure where the solenoid 36 is provided, since the calorific value of the solenoid 36 is large, the cooling effect by the sub-motor 51 is more useful.

[0087] The configuration in which the intake port 12e is provided in the second wall 12d of the solenoid housing chamber 12b was illustrated. Instead of or in addition to this, an intake port may be provided in the first wall 12c.

Explanation of Signs

[0088] 1… Driving tool 2… Driving nose part, 2a, 2b… Driving passages, 2c… Injection port 3… Contact arm, 3a… Adjuster connecting part 4… Driver guide, 4a… Feed guide part, 4b… Hole 5… Grip 6… Trigger, 6a… Trigger switch 7… Battery mounting part, 7a… Intake port 8… Battery 9… Controller 10… Tool body 11… Main body housing 12… Mechanism case (motor housing) 12a… Main motor housing chamber, 12b… Solenoid housing chamber, 12c… First wall 12d… Second wall, 12e… Intake port, 12f… First exhaust port, 12g… Second exhaust port 12h… Communication passage, 12i… Sub - motor housing chamber, 12j… Tapered surface, 12k… Hole 12m… Gear part housing chamber, 12n… Lifter housing chamber, 12p… Window part 13… Cylinder 14… Accumulator chamber, 14a… Air chamber 15… Piston 16… Driver, 16a… Rack teeth (engaged part), 16b… Tip 17… Striker, 17a… Arc - shaped surface 18… Cushion 20… Main motor, 20a… Output shaft, 20b… Bearing 21… Fan 22… Planetary reduction mechanism 23… Lift mechanism 24… Wheel 25… Engaging part, 25a… Final engaging part 26… Magazine, 26a… Right part, 26b… Left part, 26c… Support shaft, 26d… Spring receiving part 30…Feeding mechanism 31…Feeding claw, 31a…Feeding inclined surface, 31b…Receiving surface, 31c…Rotating support shaft 31d…Torsion spring 32…Compression spring (biasing member) 33…Check claw, 33a…Check inclined surface, 33b…Rotating support shaft 34…Nail guide member, 34a…Hole 35…Power transmission member, 35a…Rotating support portion, 35b…Plunger connecting portion 35c…Claw connecting portion, 35d…Spring receiving portion, 35e…Thick portion 36…Solenoid, 36a…Plunger, 36b…Coil, 36c…Holder 41…Adjuster, 41a…Rotating shaft, 41b…Compression spring 42…Contact plate 43…Spring 44…Switch, 44a…Protruding pin 51…Sub-motor, 51a…Output shaft, 51b…Bearing 52…Fan 53…Cover 60…Driving tool 61…Mechanism case (motor housing) 61a…Main motor housing chamber, 61b…Solenoid housing chamber, 61c…First wall 61d…Second wall, 61e…First air inlet, 61f…Second air inlet, 61g…Exhaust port 61h…Communication passage, 61i…Sub-motor housing chamber, 61j…Tapered surface, 61k…Through hole 61m…Gear portion housing chamber, 61n…Lifter housing chamber N…Connected driving tool n…Driving tool, na…Head m…Connecting member (wire) W…Workpiece to be driven C1…Lower position, C2…Upper position J, K…Output axis A1…Air passage (solenoid cooling passage), A2…Air passage (motor cooling passage) A3…Air passage (controller cooling passage)

Claims

1. A driving tool, comprising a main motor which is a drive source for generating power to move a driver in a driving direction, a body housing for accommodating the main motor, a sub-motor housed in the body housing and driven independently of the main motor, and a driving tool having a fan attached to an output shaft of the sub-motor.

2. The driving tool according to claim 1, comprising a controller that transmits a drive signal to the sub-motor so that the sub-motor can be driven even when the main motor stops.

3. The driving tool according to claim 1 or 2, wherein the sub-motor is driven for a longer time than the driving time of the main motor when driving one cycle of the driving operation of the driver.

4. The driving tool according to any one of claims 1 to 3, comprising a magazine for accommodating a driving tool, and a driver guide that supplies the driving tool from the magazine and guides the driver movably, wherein the sub-motor is provided between the main motor and the magazine.

5. The driving tool according to claim 4, comprising a feed pawl for feeding the driving tool from the magazine to the driver guide, and a solenoid for moving the feed pawl in a direction opposite to the feed direction, wherein the solenoid is provided between the main motor and the magazine.

6. The driving tool according to claim 5, wherein the solenoid has a cylindrical holder for accommodating a coil, A driving tool in which a solenoid cooling passage through which air flows so as to penetrate between the coil and the inner peripheral surface of the holder is provided in the main body housing by driving of the sub-motor.

7. A driving tool according to any one of claims 1 to 6, wherein the output shaft of the sub-motor extends in a direction intersecting with the extending direction of the output shaft of the main motor and intersecting with the driving direction of the driving tool.

8. A driving tool according to any one of claims 1 to 7, wherein the output shaft of the main motor is not provided with a fan, and a motor cooling passage through which air flows to the main motor by driving of the sub-motor is provided in the main body housing.

9. A driving tool according to any one of claims 1 to 8, which has a controller that transmits a driving signal to the main motor and the sub-motor, and a controller cooling passage through which air flows to the controller by driving of the sub-motor is provided in the main body housing.

10. A driving tool according to any one of claims 1 to 9, wherein a plurality of cooling passages through which air flows by driving of the sub-motor and an exhaust port for discharging the air flowing through the plurality of cooling passages are provided in the main body housing, and the exhaust port is common to the plurality of cooling passages.

11. A driving tool according to any one of claims 1 to 10, which has a piston to which the driver is connected, and a cylinder in which the piston is movably provided, and the driver is returned in the reverse driving direction by the main motor to increase the gas pressure in the cylinder.

Images