JP5009005B2 - Hammer drill - Google Patents

Description

  The present invention relates to a technique for switching a drive mode of a tool bit in a hammer drill that performs a predetermined machining operation on a workpiece by linearly moving in a long axis direction and rotating around a long axis.

  An electric hammer drill capable of switching the driving mode of the tool bit is disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-192481 (Patent Document 1). In the hammer drill described in the above publication, the operator manually rotates the mode switching lever arranged on the outer side surface of the housing, so that the tool bit moves in the long axis direction along with the hammer operation and the long axis. The mode can be switched between a hammer drill mode in which both drill operations are performed by a rotating operation, a hammer mode in which only hammer operations are performed, and a drill mode in which only drill operations are performed.

As described above, in the case of the mechanical mode switching mechanism configured to rotate the mode switching lever to switch the mode, the mode switching lever exists in a state of protruding from the outer surface of the housing. For this reason, for example, at the work site, the mode switching lever may interfere with the workpiece during the machining operation, and the drive mode of the tool bit may be switched unexpectedly, or the hammer drill is stably placed on its side so that the side of the housing contacts the ground. When placed in a posture, the mode switching lever may interfere with the ground, and the tool bit drive mode may be switched unexpectedly. Further, in the case of a mechanical mode switching mechanism, a sliding failure occurs due to dust entering the sliding portion of the mode switching lever with respect to the housing, or the internal driving mechanism due to dust entering the housing from the sliding portion. There is still a room for improvement in these respects.
JP 2002-192481 A

  In view of this point, an object of the present invention is to provide a technique that is effective in rationally switching the mode of a tool bit in a hammer drill.

  In order to achieve the above object, according to a preferred embodiment of the hammer drill according to the present invention, as a drive mode of the tool bit, a hammer drill mode that performs both a linear motion in the major axis direction and a rotational motion around the major axis, and a linear motion At least one of a hammer mode for performing only rotation and a drill mode for performing only rotational operation. The hammer drill of the present invention is provided in accordance with each mode, and a plurality of signal output units for outputting an electrical mode signal corresponding to the mode selected from each mode by an operator's manual operation, A control unit that outputs an electrical drive signal corresponding to the mode signal input from the signal output unit, and a mode switching operation unit that operates according to the drive signal from the control unit and switches the mode. The mode switching operation unit includes a mode switching motor driven by a drive signal from the control unit, and a mode switching unit that is operated by the mode switching motor and performs mode switching between the plurality of modes. The “signal output unit for outputting a mode signal” in the present invention is typically configured as a mode for outputting a contact signal, preferably an ON signal, by operating a push button.

  According to the present invention configured as described above, an operator operates a signal output unit corresponding to a desired mode from among a plurality of signal output units, thereby driving a tool bit using a mode switching motor. The mode can be switched to a desired mode. For this reason, a rational mode switching mechanism with good operability is constructed. The signal output unit may interfere with the workpiece or directly on the ground during machining operations or when the hammer drill is placed on the ground, for example. It can be arranged in a state where it does not protrude from the outer surface of the hammer drill so that it does not exist, that is, does not exist as a projection. This is effective in preventing unexpected switching of modes. Also, the operation target by the operator is an electrical signal output unit, which is effective in preventing malfunctions of the signal output unit due to dust generated during work or harmful effects caused by dust entering the housing. .

In the present invention, the mode switching operation unit includes a motor stop unit that stops the driving of the mode switching motor when the mode is switched by the mode switching unit. The motor stop unit is in contact with the plurality of protrusions, a rotating body that is rotationally driven by the mode switching motor, a plurality of protrusions that are arranged on the rotating body at predetermined intervals in the circumferential direction corresponding to each mode. And an electric switch for outputting a motor stop signal for stopping the driving of the mode switching motor to the control unit. According to the present invention, when a motor stop signal is output from the electrical switch to the control unit, the control unit stops the mode switching motor based on the output. Thereby, it can switch to the desired mode selected by the operator.

  Moreover, in the further form of the hammer drill which concerns on this invention, it has hammer mode and drill mode in addition to hammer drill mode, respectively. The mode switching unit is configured to switch modes between the hammer drill mode, the hammer mode, and the drill mode. According to such a configuration, the operator selectively operates the signal output unit for the hammer drill mode, the hammer mode, and the drill mode, so that the three modes of the hammer drill mode, the hammer mode, and the drill mode are selected. The driving mode of the tool bit can be switched between.

Moreover, according to the further form of the hammer drill which concerns on this invention, the power transmission state which is provided in the 1st drive-mechanism part which drives a tool bit linearly to a major axis direction, and is provided in a 1st drive-mechanism part, and transmits a driving force. A first clutch mechanism that is switched between a power cutoff state that interrupts transmission of the driving force, a second drive mechanism portion that rotates the tool bit about the major axis, and a second drive mechanism portion. And a second clutch mechanism that is switched between a power transmission state that transmits the driving force and a power cutoff state that interrupts the transmission of the driving force. On the other hand, the mode switching unit includes a first mode switching member that switches the state of the first clutch mechanism, and a second mode switching member that switches the state of the second clutch mechanism. The first and second mode switching members are driven by a single mode switching motor.
As described above, when the first and second mode switching members for switching modes are driven by a single mode switching motor, the mode switching operation unit can be constructed with a small number of components. . For this reason, it is easy to secure the space for disposing the mode switching operation portion, and it is advantageous for reducing the weight of the hammer drill.

  According to a further aspect of the hammer drill according to the present invention, the first and second mode switching members are individually driven by mode switching motors respectively provided according to the first and second mode switching members. The configuration is as follows. As described above, when the first and second mode switching members are individually driven by the mode switching motor, the first and second mode switching members are operated by the motor for mode switching. The operation amount and position of the first and second mode switching members can be set individually, and a design freedom regarding setting of the operation amount and position can be obtained.

Further, in a further embodiment of the hammer drill according to the present invention, the operator further has a neutral mode as a mode selected by the operator, and when the neutral mode is selected, the operator can manually rotate the tool bit. The configuration is as follows. In the present invention, “the operator can manually rotate the tool bit” means that the second clutch mechanism is switched to the power cut-off state, and the tool bit rotationally drives the tool bit. It means to be disconnected from the second drive mechanism.
The hammer drill has a configuration that regulates the rotation in the circumferential direction (vario-lock) so that the tool bit does not move (rotate) in the circumferential direction during the machining operation when working in the hammer mode. It is common. Therefore, according to the present invention, when the tool bit drive mode is switched to the hammer mode, it is possible to switch to the neutral mode and adjust the direction of the tip of the tool bit before switching to the hammer mode. can get.

  According to the present invention, a technique effective for rationally switching the mode of a tool bit in a hammer drill is provided.

(First embodiment of the present invention)
Hereinafter, the first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a partially broken side view showing the entire configuration of the electric hammer drill according to the present embodiment. As shown in FIG. 1, the hammer drill 101 according to the present embodiment is generally viewed as having a main body 103 that forms an outline of the hammer drill 101, and a hollow shape in a tip region (left side in the drawing) of the main body 103. A hammer bit 119 detachably attached via a tool holder (not shown for convenience) and a hand grip 109 gripped by a user connected to the opposite side of the hammer bit 119 of the main body 103 are mainly configured. . The hammer bit 119 is held by a tool holder in a state in which relative linear movement in the major axis direction is possible and relative rotation in the circumferential direction is restricted. The main body 103 corresponds to the “work tool main body” in the present invention, and the hammer bit 119 corresponds to the “tool bit” in the present invention. For convenience of explanation, the hammer bit 119 side is referred to as the front, and the hand grip 109 side is referred to as the rear.

  The main body 103 includes a motor housing 105 that houses the drive motor 111, and a gear housing 107 that houses the motion conversion mechanism 113, the striking element 115, and the power transmission mechanism 117. The rotational output of the drive motor 111 is appropriately converted into a linear motion by the motion conversion mechanism 113 and then transmitted to the striking element 115, and the major axis direction of the hammer bit 119 (the left-right direction in FIG. 1) via the striking element 115. Generates an impact force on. The rotation output of the drive motor 111 is transmitted to the hammer bit 119 after being appropriately decelerated by the power transmission mechanism 117, and the hammer bit 119 is rotated in the circumferential direction. The drive motor 111 is energized and driven by a pulling operation of a trigger 109 a disposed on the hand grip 109. The motion conversion mechanism 113 corresponds to the “first drive mechanism” in the present invention, and the power transmission mechanism 117 corresponds to the “second drive mechanism” in the present invention.

  2 to 5 are enlarged sectional views showing the main part of the hammer drill 101. 6 and 7 show a cross-sectional structure based on the cross-section indicating line in FIG. As shown in FIGS. 2 to 5, the motion conversion mechanism 113 is mainly configured by a crank mechanism 114 that converts rotation of the drive motor 111 into linear motion. A piston 129 as a driver in the crank mechanism 114 is slidably disposed in the cylinder 141 and performs a linear motion along the cylinder 141. The crankshaft 122 in the crank mechanism 114 is arranged so that the major axis direction of the crankshaft 122 is a vertical direction (vertical direction) intersecting the major axis direction of the hammer bit 119, and the crankshaft 122, the driven gear 123, A clutch member 124 is disposed between the two. The driven gear 123 is rotationally driven from the drive motor 111 via the drive gear 121.

  The clutch member 124 is mounted on the crankshaft 122 so as to be relatively movable in the long axis direction and to rotate integrally in the circumferential direction, and moves on the crankshaft 122 in the long axis direction (vertical direction). As a result, the clutch teeth 124a (see FIG. 7) of the clutch member 124 are engaged with or engaged with the clutch teeth 123a (see FIG. 7) of the driven gear 123. That is, the clutch member 124 has a power transmission state in which the rotational driving force of the driven gear 123 is transmitted to the crankshaft 122 (see FIGS. 2 and 3) and a power cutoff state in which the transmission of the rotational driving force is interrupted (see FIG. 4). The clutch teeth 124a and 123a are normally urged by the urging spring 126 in the direction in which they engage and engage. The switching of the operating state of the clutch member 124 will be described later. The clutch member 124 corresponds to the “first clutch mechanism” in the present invention.

  The striking element 115 is a striker 143 that is slidably disposed on the bore inner wall of the cylinder 141, and is slidably disposed on the tool holder, and transmits the kinetic energy of the striker 143 to the hammer bit 119. It is mainly composed of an impact bolt 145 as a meson. The striker 143 is driven via an air spring in the air chamber of the cylinder 141 in accordance with the sliding movement of the piston 129, and collides with (impacts) an impact bolt 145 slidably disposed on the tool holder. The striking force is transmitted to the hammer bit 119 via.

  The power transmission mechanism 117 meshes with the intermediate gear 132 that meshes with and engages with the drive gear 121, the intermediate shaft 133 that rotates with the intermediate gear 132, the small bevel gear 134 that is rotationally driven in the horizontal plane with the intermediate shaft 133, and the small bevel gear 134. A large bevel gear 135 that engages and rotates in a vertical plane and a slide sleeve 147 that meshes with and engages with the large bevel gear 135 and is driven to rotate are mainly configured. The rotational driving force of the slide sleeve 147 is transmitted to the tool holder via the cylinder 141 that rotates together with the slide sleeve 147, and further transmitted to the hammer bit 119 held by the tool holder. As shown in FIG. 6, the slide sleeve 147 is engaged with the cylinder 141 through a radial protrusion and recess that extend in the major axis direction, and is relatively moved on the cylinder 141 in the hammer bit major axis direction. It is possible and is configured to rotate integrally in the circumferential direction.

  The slide sleeve 147 constitutes a clutch mechanism in the power transmission mechanism 117, and has a clutch tooth 147a at one end outer peripheral portion in the major axis direction, and is relatively moved rearward (hand grip side) with respect to the cylinder 141. In some cases, when the clutch teeth 135a formed on the large bevel gear 135 are engaged with each other and moved forward (hammer bit side), the engagement engagement is released. That is, the slide sleeve 147 has a power transmission state (the state shown in FIGS. 3 and 4) that transmits the rotational driving force of the large bevel gear 135 to the cylinder 141, and a power cutoff state that interrupts the transmission of the driving force (shown in FIG. 2). The state can be switched between. The slide sleeve 147 is normally urged by the urging spring 148 in a direction in which the clutch teeth 147a are engaged with and engaged with the clutch teeth 135a of the large bevel gear 135. The slide sleeve 147 corresponds to the “second clutch mechanism” in the present invention. The switching of the operating state of the slide sleeve 147 will be described later.

  Further, the slide sleeve 147 has rotation lock teeth 147b on the other end side (front end side) in the long axis direction. When the slide sleeve 147 is moved forward and switched to the power cut-off state (when the hammer bit 119 is driven in the hammer mode), the lock ring 149 provided in a fixed state in the circumferential direction with respect to the gear housing 107. This makes it possible to perform a so-called variolock that restricts free movement in the circumferential direction of the cylinder 141, the tool holder, and the hammer bit 119.

  Next, mode switching for switching the driving mode of the hammer bit 119 will be described with reference mainly to FIG. 1 and FIGS. The hammer drill 101 according to the present embodiment is a hammer mode in which the hammer bit 119 performs only a hammer operation by a hammering operation, a hammer drill mode in which the hammer bit 119 performs both a hammer operation by a hammering operation and a drill operation by a rotation operation, In addition, there is a drill mode in which the hammer bit 119 performs only a drilling operation by a rotating operation, and in addition to these three drive modes, there is a neutral mode in which the hammer bit 119 is not driven. As a means for switching the mode between these four modes, the four push buttons 153, 155, 157, and 159 that are pushed by the operator's fingers and the push buttons 153, 155, 157, and 159, respectively. Correspondingly, four contact signal output units (not shown for convenience) are arranged to output electrical mode signals, for example, ON / OFF contact signals, by pressing the push buttons 153, 155, 157, 159. A switch panel 151, a controller 161 that outputs an electrical drive signal corresponding to an electrical mode signal input from each of the push buttons 153, 155, 157, and 159 (contact signal output unit); Operates in response to the drive signal, and performs mode switching (that is, clutch mechanism switching). It has a over-de-switching mechanism 169. Each push button 153, 155, 157, 159 and the contact signal output unit correspond to the “signal output unit” in the present invention. The controller 161 corresponds to the “control unit” in the present invention, and the mode switching mechanism 169 corresponds to the “mode switching operation unit” in the present invention. Note that the “push button” in the following description includes a contact signal output unit unless otherwise specified.

  As shown in FIG. 12, the four push buttons 153, 155, 157, and 159 are distinguished by symbols for hammer, hammer drill, drill, and neutral, respectively, and the main body portion 103 with respect to the switch panel 151. Are arranged in series in a direction crossing the major axis direction. The switch panel 151 is disposed in a recess 103 a (see FIG. 1) formed on the outer upper surface of the main body 103, and the upper surface is set to be lower than the outer upper surface of the main body 103. Note that the push buttons 153, 155, 157, and 159 are configured to output an electrical signal when the fingertip is pressed, or to output an electrical signal when the fingertip comes into contact. The switch panel 151 is provided with indicator lights 152 as means for notifying (displaying) the selected mode corresponding to the push buttons 153, 155, 157, and 159.

  As shown in FIG. 1, the push buttons 153, 155, 157, and 159 are connected to a controller 161 disposed in the motor housing 105 by an electric wire 163, and when operated by an operator, And a mode signal is output. The controller 161 is connected to the mode switching mechanism 169 via an electric wire 165 so that an electric drive signal corresponding to the mode signal output from the push buttons 153, 155, 157, 159 is output to the mode switching mechanism 169. Composed.

  The mode switching mechanism 169 includes a first switching mechanism 172 that switches the clutch member 124 of the crank mechanism 114 (see FIG. 6) and a second switching mechanism 173 that switches the slide sleeve 147 of the power transmission mechanism 117 (see FIG. 7). A single mode switching motor 174 that is energized and driven by a drive signal from the controller 161 and drives the first switching mechanism 172 and the second switching mechanism 173, respectively, and an electrical signal for stopping the mode switching motor 174. The motor stop electrical switch 184 (see FIGS. 8 to 11) is output. As shown in FIGS. 6 and 7, the mode switching mechanism 169 has a unit structure accommodated in the mode switching portion accommodating case 171, and has a screw or the like on one side surface portion of the main body portion 103, that is, the side surface portion of the gear housing 107. Is detachably mounted.

  As the first switching mechanism 172 is energized and driven by the mode switching motor 174, the first eccentric pin 178 rotates (eccentrically rotates) in the direction of the arrow shown in FIG. 8 around the rotation axis of the first rotating body 177. 114 clutch members 124 are configured to be switched. The first switching mechanism 172 includes a first drive gear 175 (worm), a first driven gear (worm wheel) 176, a first rotating body 177, and a first eccentric pin 178. The first drive gear 175 is fixed to one end portion on the output shaft of the mode switching motor 174 and meshes and engages with the first driven gear 176 at all times. The first driven gear 176 is provided integrally with the first rotating body 177 so as to rotate around the axis intersecting the major axis direction of the clutch member 124 together with the first rotating body 177, that is, in a vertical plane. Is provided. As shown in FIG. 6, the first eccentric pin 178 is provided on the axial end surface of the first rotating body 177 at a position eccentric from the rotation axis of the rotating body 177 by a predetermined amount, and from the mode switching unit housing case 171. It is inserted into the gear housing 107 and disposed so as to face the lower surface of the flange portion 124 b of the clutch member 124. Therefore, the first eccentric pin 178 has a vertical component (the length of the crankshaft 122) when the first rotating body 177 rotates eccentrically around the rotation axis of the first rotating body 177 when the first rotating body 177 is rotated in the vertical plane. The clutch member 124 is moved in the vertical direction along the crankshaft 122 while being engaged with the flange portion 124b of the clutch member 124 by the axial component), so that the clutch member 124 is moved to the power transmission state and the power cutoff position. Switching operation between. The first eccentric pin 178 corresponds to the “first mode switching member” in the present invention.

  When the mode of the drill bit 119 is switched to the hammer mode or the hammer drill mode, the first eccentric pin 178 is positioned at the same position as the rotation axis of the first rotating body 177 in the vertical direction as shown in FIGS. Or moved to a lower position. At this time, the clutch member 124 is moved downward by the biasing spring 126, and the clutch teeth 124 a are engaged with the clutch teeth 123 a of the driven gear 123. As a result, the crank mechanism 114 is switched to the power transmission state. On the other hand, when the mode is switched to the drill mode or the neutral mode, the first eccentric pin 178 is moved to a position above the rotation axis of the first rotating body 177 in the vertical direction, as shown in FIGS. The At this time, the clutch member 124 is moved upward against the biasing force of the biasing spring 126 by the first eccentric pin 178, and the meshing engagement of the clutch teeth 124a, 123a is released. As a result, the crank mechanism 114 is switched to the power cut-off state.

  The second switching mechanism 173 transmits power by the second eccentric pin 183 rotating in the direction of the arrow shown in FIG. 8 (eccentric rotation) around the rotation axis of the second rotating body 182 in accordance with the energization driving of the mode switching motor 174. The slide sleeve 147 of the mechanism 117 is configured to be switched. The second switching mechanism 173 includes a second drive gear 179, a second driven gear 181, a second rotating body 182, and a second eccentric pin 183. The second drive gear 179 is fixed to the other end on the output shaft of the mode switching motor 174, and is always meshed with and engaged with the second driven gear 181. The second driven gear 181 is provided integrally with the second rotating body 182, and rotates together with the second rotating body 182 around an axis that intersects the long axis direction of the slide sleeve 147, that is, within a vertical plane. Is provided. As shown in FIG. 7, the second eccentric pin 183 is provided on the axial end surface of the second rotator 182 at a position eccentric from the rotation axis of the second rotator 182 by a predetermined amount, and the mode switching unit accommodating case. 171 is inserted into the gear housing 107 and is disposed so as to face the rear surface of the flange portion 147 c of the slide sleeve 147. Accordingly, the second eccentric pin 183 has a longitudinal component (long axis of the cylinder 141) when the second rotating body 182 rotates eccentrically around the rotation axis of the second rotating body 182 when the second rotating body 182 is rotated in the vertical plane. The slide sleeve 147 is moved in the front-rear direction along the cylinder 141 while being engaged with the flange portion 147c of the slide sleeve 147 by the direction component), whereby the slide sleeve 147 is moved between the power transmission state and the power shut-off position. Switch operation with. The second eccentric pin 183 corresponds to the “first mode switching member” in the present invention.

  When the mode of the hammer bit 119 is switched to the hammer drill mode or the drill mode, the second eccentric pin 183 is rearward of the rotation axis of the second rotating body 182 in the front-rear direction as shown in FIG. 3 or FIG. Moved to position. At this time, the slide sleeve 147 is moved rearward by the biasing spring 148, and the clutch teeth 147 a meshes with and engages with the clutch teeth 135 a of the large bevel gear 135. That is, the slide sleeve 147 is switched to the power transmission state. On the other hand, when switched to the neutral mode, the second eccentric pin 183 is moved to substantially the same position as the rotation axis of the second rotating body 182 in the front-rear direction, as shown in FIG. At this time, the slide sleeve 147 is moved forward against the biasing force of the biasing spring 148 by the second eccentric pin 183, and the meshing engagement of the clutch teeth 147a and 135a is released. That is, the slide sleeve 147 is switched to the power cut-off state. When the mode is switched to the hammer mode, the second eccentric pin 183 is moved to a position ahead of the rotation axis of the second rotating body 182 as shown in FIG. At this time, the slide sleeve 147 is further moved forward against the biasing force of the biasing spring 148 by the second eccentric pin 183, and maintains the state where the meshing engagement of the clutch teeth 147a and 135a is released. Meanwhile, the rotation locking tooth 147b meshes with and engages with the tooth 149a of the lock ring 149. That is, the slide sleeve 147 is maintained in the power cut-off state, and the movement in the circumferential direction is restricted to operate the variolock.

  The gear ratio between the first drive gear 175 and the first driven gear 176 and the gear ratio between the second drive gear 179 and the second driven gear 181 are set to be equal to each other. Accordingly, when the first rotating body 177 rotates once, the second rotating body 182 also rotates once.

  Further, on the side surface of the second rotating body 182, a hammer mode projection 185a, a hammer drill mode projection 185b, a drill mode projection 185c, and a neutral mode projection 185d are arranged at predetermined intervals in the circumferential direction. . These four protrusions 185a to 185d are brought into contact with the motor stop electric switch 184 to operate the electric switch 184 when the second rotating body 182 is rotated. The protrusions 185a to 185d and the motor stop electrical switch 184 correspond to the “motor stop portion” in the present invention. An operation signal of the motor stop electric switch 184 is input to the controller 161. The controller 161 outputs a stop signal to the mode switching motor 174 based on the recognition that the driving mode of the hammer bit 119 has been switched to the selected mode and the operation signal input from the motor stop electrical switch 184. It is supposed to be configured. The mode recognition by the controller 161 is, for example, a detection signal that is input to the controller 161, for example, a detection signal indicating which one of the four protrusions 185a to 185d is in contact with the motor stop electrical switch 184, or a clutch member. 124 and the position detection signal of the slide sleeve 147 or the history of the number of rotations of the mode switching motor 174 (integrated number of rotations from the initial setting).

  Next, switching of the mode of the hammer drill 101 configured as described above will be described. When the operator selects a push button corresponding to a desired mode from the push buttons 153, 155, 157, and 159 and performs a pressing operation, a mode signal corresponding to the push button is input to the controller 161. Then, the controller 161 outputs an electrical drive signal corresponding to the input mode signal to the mode switching mechanism 169. The mode switching motor 174 is energized and driven by this drive signal.

[When the operator selects and operates the push button 153 for the hammer mode]
In the first switching mechanism 172, the driving of the mode switching motor 174 rotates the first driving gear 175, the first driven gear 176, and the first rotating body 177. As shown in FIG. The clutch member 124 is separated from the flange portion 124b. As a result, the clutch member 124 is moved downward by the biasing spring 126, and the clutch teeth 124 a mesh with the clutch teeth 123 a of the driven gear 123. That is, the crank mechanism 114 that strikes the hammer bit 119 (linear motion) is switched to the power transmission state. On the other hand, in the second switching mechanism 173, the second drive gear 179, the second driven gear 181 and the second rotating body 182 are rotated, and the second eccentric pin 183 pushes the flange portion 147c of the slide sleeve 147 forward. As a result, the slide sleeve 147 is separated from the large bevel gear 135, and the meshing engagement between the clutch teeth 147a and the clutch teeth 135 of the large bevel gear 135 is released. That is, the power transmission mechanism 117 that rotates the hammer bit 119 is switched to the power cutoff state. Further, the rotation locking tooth 147b of the slide sleeve 147 meshes with and engages with the tooth 149a of the lock ring 149, so that the variolock operates. Thus, the hammer mode in which the hammer bit 119 performs only the striking operation is set. This state is shown in FIG. When the mode is switched to the hammer mode, the hammer mode protrusion 185 a comes into contact with the motor stop electrical switch 184, and an operation signal of the electrical switch 184 is input to the controller 161. The controller 161 outputs a stop signal to the mode switching motor 174 based on the recognition that the mode has been switched to the hammer mode and the operation signal of the motor stop electric switch 184 being input. This state is shown in FIG. At this time, the indicator lamp 152 for the hammer mode is turned on to notify the operator. FIG. 13 is a flowchart showing processing and control flow by the controller 161 in the hammer mode related to the mode switching motor 172.

  In the above hammer mode, when the drive motor 111 is energized and driven by pulling the trigger 109a, the rotational motion of the drive motor 111 is converted into linear motion by the crank mechanism 114, and the piston 129 is linearly formed along the cylinder 141. It is slid. The striker 143 linearly moves in the cylinder 141 and collides with the impact bolt 145 due to a change in the pressure of air in the air chamber of the cylinder 141 accompanying the sliding movement of the piston 129, that is, the action of the air spring. Is transmitted to the hammer bit 119. At this time, since the slide sleeve 147 of the power transmission mechanism 117 is switched to the power cut-off state, the hammer bit 119 does not rotate. For this reason, in the hammer mode, a predetermined hammering operation can be performed only by the hammering operation (hammer operation) of the hammer bit 119.

[When the operator selects and operates the push button 155 for hammer drill mode]
The first eccentric pin 178 of the first switching mechanism 172 approaches the flange portion 124b of the clutch member 124 as viewed from the position in the hammer mode, but is opposed to the flange portion 124b with a slight gap therebetween. It just does, and does not push up. For this reason, the power transmission state of the crank mechanism 114 by the clutch member 124 is maintained. On the other hand, since the second eccentric pin 183 of the second switching mechanism 173 is separated from the flange portion 147c of the slide sleeve 147, the slide sleeve 147 is moved toward the large bevel gear 135 by the biasing force of the biasing spring 148. The clutch teeth 147a mesh with and engage with the clutch teeth 135a of the large bevel gear 135, and the power transmission mechanism 117 is switched to the power transmission state. Thus, the hammer bit 119 is switched to the hammer drill mode in which the hammering operation and the rotation operation are performed. This state is shown in FIG. When the mode is switched to the hammer drill mode, the hammer drill mode projection 185 b comes into contact with the motor stop electrical switch 184, and an operation signal of the electrical switch 184 is input to the controller 161. The controller 161 outputs a stop signal to the mode switching motor 174 based on the recognition that the mode has been switched to the hammer drill mode and the operation signal of the motor stop electric switch 184 being input. This state is shown in FIG. At this time, the indicator light 152 for the hammer drill mode is turned on to notify the operator. FIG. 14 is a flowchart showing the flow of processing and control by the controller 161 in the hammer drill mode related to the mode switching motor 172.

  In this hammer drill mode, when the drive motor 111 is energized by pulling the trigger 109a of the handgrip 109, the crank mechanism 114 is driven and the striker 143 and the impact bolt 145 constituting the striking element 115 are moved as in the hammer mode. The kinetic energy is transmitted to the hammer bit 119 via this. On the other hand, the rotational output of the drive motor 111 is transmitted as a rotational motion to the cylinder 141 via the power transmission mechanism 117, and further held in a state where relative rotation is restricted by the tool holder connected to the cylinder 141 and the tool holder. Is transmitted to the hammer bit 119 as a rotational motion. That is, in the hammer drill mode, the hammer bit 119 is driven by a combined operation of a hammering operation (hammer operation) and a rotation operation (drilling operation), whereby a predetermined hammer drill operation can be performed on the workpiece.

[When the operator selects and operates the push button 157 for drill mode]
The first eccentric pin 178 of the first switching mechanism 172 moves upward and pushes up the flange portion 124b of the clutch member 124 upward. As a result, the clutch teeth 124a of the clutch member 124 are separated from the clutch teeth 123a of the driven gear 123, the meshing engagement is released, and the crank mechanism 114 is switched to the power cut-off state. On the other hand, the second eccentric pin 183 of the second switching mechanism 173 is separated from the flange portion 147 c of the slide sleeve 147. Therefore, the slide sleeve 147 is moved to the large bevel gear 135 side by the biasing force of the biasing spring 148, and the clutch teeth 147a are engaged with the clutch teeth 135a of the large bevel gear 135, so that the power transmission mechanism 117 is powered. Switch to transmission state. Thus, the hammer bit 119 is switched to the drill mode in which only the rotation operation is performed. This state is shown in FIG. When the mode is switched to the drill mode, the projection 185 c for the drill mode comes into contact with the electric switch 184 for stopping the motor, and an operation signal of the electric switch 184 is input to the controller 161. The controller 161 outputs a stop signal to the mode switching motor 174 based on the recognition that the mode has been switched to the drill mode and the operation signal of the motor stop electric switch 184 being input. This state is shown in FIG. At this time, the indicator lamp 152 for drill mode is turned on to notify the operator. FIG. 15 is a flowchart showing a process and control flow by the controller 161 in the drill mode related to the mode switching motor 172.

  In this drill mode, when the drive motor 111 is energized and driven by pulling the trigger 109a of the handgrip 109, the clutch mechanism 124 is switched to the power cut-off state, so the crank mechanism 114 is not driven and the hammer bit 119 No hitting action is performed. On the other hand, in the power transmission mechanism 117, since the slide sleeve 147 is in a power transmission state, the rotational output of the drive motor 111 is transmitted to the hammer bit 119 as a rotational motion. That is, in the drill mode, the hammer bit 119 is driven only by a rotation operation (drill operation), and thereby a predetermined drill operation can be performed on the workpiece.

[When the operator selects and operates the push button 159 for the neutral mode]
The first eccentric pin 178 of the first switching mechanism 172 moves upward and pushes up the flange portion 124b of the clutch member 124 upward. As a result, the clutch teeth 124a of the clutch member 124 are separated from the clutch teeth 123a of the driven gear 123, the meshing engagement is released, and the crank mechanism 114 is switched to the power cut-off state. On the other hand, in the second switching mechanism 173, the second eccentric pin 183 pushes the flange portion 147c of the slide sleeve 147 forward. As a result, the clutch teeth 147a of the slide sleeve 147 are separated from the clutch teeth 135a of the large bevel gear 135, the meshing engagement is released, and the power transmission mechanism 117 is switched to the power cut-off state. At this time, the amount of forward movement of the slide sleeve 147 is smaller than the amount of movement in the hammer mode. For this reason, the tooth 147b for rotation lock of the slide sleeve 147 is engaged with the tooth 149a of the lock ring 149 and is not engaged. Thus, the hammer bit 119 is switched to the neural mode in which neither the hitting operation nor the rotating operation is performed. This state is shown in FIG. When the mode is switched to the neutral mode, the neutral mode protrusion 185 d abuts on the motor stop electrical switch 184, and an operation signal of the electrical switch 184 is input to the controller 161. The controller 161 outputs a stop signal to the mode switching motor 174 based on the recognition that the mode has been switched to the neutral mode and the activation signal of the motor stop electric switch 184 being input. This state is shown in FIG. At this time, the indicator lamp 152 for the neutral mode is turned on to notify the operator. FIG. 16 is a flowchart showing the flow of processing and control by the controller 161 in the neutral mode related to the mode switching motor 172.

  In this neutral mode, since the power transmission mechanism 117 is switched to the power cut-off state, the operator can adjust the direction by grasping the hammer bit 119 with his / her fingers, and then switch to the hammer mode to change the above-described vario lock. In this state, the hammer work can be performed with the direction of the hammer bit 119 held constant.

  In addition, during the mode switching operation by the mode switching mechanism 169, the motor stop electric switch 184 is not switched to the mode selected by the operator, that is, the controller 161 does not recognize the selected mode. When the activation signal is input to the controller 161, the controller 161 invalidates the activation signal. For example, in the case where the hammer mode shown in FIGS. 2 and 8 is selected from the state of the hammer drill mode shown in FIGS. 3 and 9, the motor stop electrical switch 184 is not operated by the hammer mode protrusion 185a. At this stage, the projection 185c for the drill mode and the projection 185d for the neutral mode come into contact with each other. However, the controller 161 invalidates the operation signal output from the motor stop electrical switch 184 by the contact based on the recognition that it is not the selected hammer mode at that time. Then, the controller 161 recognizes that the mode has been switched to the hammer mode, and the operation signal output from the electrical switch 184 when the hammer mode projection 185a comes into contact with the motor stop electrical switch 184. A stop signal is output to the mode switching motor 174. The above is the same when other modes are selected.

  As described above, according to the hammer drill 101 according to the present embodiment, the mode switching motor 174 is selected by the operator selectively operating the plurality of push buttons 153, 155, 157, and 159 provided on the switch panel 151. , The mode of the hammer bit 119 can be switched among the hammer mode, the hammer drill mode, the drill mode, and the neutral mode. For this reason, a rational mode switching mechanism with good operability is constructed. The push buttons 153, 155, 157, and 159 are provided so as not to protrude from the outer surface of the main body 103. For this reason, the push buttons 153, 155, 157, and 159 do not come into contact with the work material during the work of the work material, for example, at a work site, thereby preventing an unexpected change of mode.

  Moreover, since the mode is switched by operating the push buttons 153, 155, 157, and 159 for mode switching, the operation of the push buttons 153, 155, 157, and 159 caused by dust generated during the machining operation or dust is the main body. This is effective in preventing harmful effects caused by entering the unit 103. In addition, according to the present embodiment, the first eccentric pin 178 as the first mode switching member and the second eccentric pin 183 as the first mode switching member are driven by the single mode switching motor 174. By doing so, the mode switching mechanism 169 can be constructed with a small number of components. For this reason, it becomes easy to secure the space for disposing the mode switching mechanism 169 and to reduce the weight of the hammer drill 101.

  Further, the mode switching mechanism 169 according to the present embodiment has a unit structure housed in the mode switching unit housing case 171 and is configured to be detachably mounted on the side surface portion of the gear housing 107. For this reason, the assembly property or repairability of the mode switching mechanism 169 with respect to the hammer drill 101 is improved.

(Second embodiment of the present invention)
Next, a second embodiment of the present invention will be described with reference to FIGS. This embodiment relates to a change of the mode switching mechanism 169 in the hammer drill 101 according to the first embodiment. Therefore, components substantially equivalent to those of the first embodiment described above are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

  As shown in FIGS. 21 to 24, the mode switching mechanism 169 according to the present embodiment has two mode switching motors 186 and 187. Then, the first eccentric pin 178 of the first switching mechanism 172 is driven by one, ie, the first mode switching motor 186, and the second eccentric pin 183 of the second switching mechanism 173 is driven by the other, ie, the second mode switching motor 187. It is configured to drive.

  The mode switching mechanism 169 includes a first motor stop electrical switch 188 corresponding to the first mode switch motor 186 and a second motor stop electrical switch 189 corresponding to the second mode switching motor 187. Further, a common protrusion 191a for the hammer mode, hammer drill mode and neutral mode and a protrusion 191b for the drill mode are provided on the side surface of the first rotating body 177 at predetermined intervals in the circumferential direction of the first rotating body 177. The first motor stop electric switch 188 is operated by the two protrusions 191a and 191b. On the other hand, a protrusion 192a for hammer mode, a common protrusion 192b for hammer drill mode and drill mode, and a protrusion 192c for neutral mode are provided on the side surface of the second rotating body 182 in the circumferential direction of the second rotating body 182. The second motor stop electric switch 189 is operated by the three protrusions 192a, 192b, and 192c. The first mode switching motor 186 and the second mode switching motor 187 are configured to be individually controlled by the controller 161.

[When the operator selects and operates the push button 153 for the hammer mode]
If the mode before the operation is in the drill mode, the first mode switching motor 186 is energized and the first driving gear 175, the first driven gear 176, and the first rotating body 177 are rotated. For this reason, the first eccentric pin 178 moves downward and is separated from the clutch member 124. As a result, the clutch member 124 is pushed by the biasing spring 126 and meshed with the driven gear 123, and the crank mechanism 114 is switched to the power transmission state. When the common protrusion 191a comes into contact with the first motor stop electrical switch 188 and the operation signal from the electrical switch 188 is input to the controller 161, the controller 161 recognizes that the mode has switched to the hammer mode, A stop signal is output to the first mode switching motor 186 based on the input of the operation signal of the 1-motor stop electrical switch 188. However, if the mode before the operation is the hammer drill mode or the neutral mode, the first mode switching motor 186 is not driven because the crank mechanism 114 is already in the power transmission state. FIG. 25 is a flowchart showing the flow of processing and control by the controller 161 in the hammer mode for the first mode switching motor 186.

  On the other hand, the second mode switching motor 187 is energized and driven regardless of the mode before the operation except the hammer mode, and the second drive gear 179, the second driven gear 181 and the second rotating body 1182 are driven. It is rotated. Therefore, the second eccentric pin 183 moves forward and pushes the slide sleeve 147 forward. As a result, the slide sleeve 147 is separated from the large bevel gear 135, the meshing engagement with the large bevel gear 135 is released, and the power transmission mechanism 117 is switched to the power cut-off state. Further, the slide sleeve 147 is engaged with and engaged with the lock ring 149, and the vario lock is activated. Then, when the common hammer mode protrusion 192a comes into contact with the second motor stop electric switch 189 and the operation signal from the electric switch 189 is input to the controller 161, the controller 161 has switched to the hammer mode. The stop signal is output to the second mode switching motor 187 based on the recognition and the operation signal of the second motor stop electric switch 189 being input. FIG. 26 is a flowchart showing the flow of processing and control by the controller 161 in the hammer mode for the second mode switching motor 187. Thus, the mode of the hammer bit 119 is switched to the hammer mode. This state is shown in FIGS. In this hammer mode, if the drive motor 111 is energized and driven, a predetermined hammering operation can be performed only by the hammering operation (hammer operation) of the hammer bit 119.

[When the operator selects and operates the push button 155 for hammer drill mode]
If the mode before the operation is in the drill mode, the first mode switching motor 186 is energized and the first driving gear 175, the first driven gear 176, and the first rotating body 177 are rotated. For this reason, the first eccentric pin 178 moves downward and is separated from the clutch member 124. As a result, the clutch member 124 is pushed by the biasing spring 126 and meshed with the driven gear 123, and the crank mechanism 114 is switched to the power transmission state. When the common protrusion 191a comes into contact with the first motor stop electrical switch 188 and an operation signal from the electrical switch 188 is input to the controller 161, the controller 161 recognizes that the hammer drill mode has been switched, A stop signal is output to the first mode switching motor 186 based on the input of the operation signal of the 1-motor stop electrical switch 188. However, if the mode before the operation is the hammer mode or the neutral mode, the first mode switching motor 186 is not driven because the crank mechanism 114 is already in the power transmission state. FIG. 27 is a flowchart showing the flow of processing and control by the controller 161 in the hammer drill mode for the first mode switching motor 186.

  On the other hand, if the mode before the operation is in the hammer mode or the neutral mode, the second mode switching motor 187 is energized and the second driving gear 179, the second driven gear 181 and the second rotating body 1182 are rotated. . For this reason, the second eccentric pin 183 moves rearward and moves away from the slide sleeve 147. As a result, the slide sleeve 147 is pushed by the biasing spring 148 and meshed with the large bevel gear 135, and the power transmission mechanism 117 is switched to the power transmission state. Further, the meshing engagement of the slide sleeve 147 with the lock ring 149 is released. Then, when the common (for hammer drill mode and drill mode) protrusion 192b comes into contact with the second motor stop electrical switch 189 and an operation signal from the electrical switch 189 is input to the controller 161, the controller 161 A stop signal is output to the second mode switching motor 187 based on the recognition that the mode has been switched and the operation signal of the second motor stop electric switch 189 being input. However, if the mode before the operation is the drill mode, the power transmission mechanism 117 is in the power transmission state, so the second mode switching motor 187 is not driven. FIG. 28 is a flowchart showing processing and control flow by the controller 161 in the hammer drill mode for the second mode switching motor 187. Thus, the mode of the hammer bit 119 is switched to the hammer drill mode. This state is shown in FIG. 18 and FIG. In the hammer drill mode, if the drive motor 111 is energized and driven, hammer drill work by hammering operation (hammer operation) and rotation operation (drilling operation) of the hammer bit 119 can be performed.

[When the operator selects and operates the push button 157 for drill mode]
The first mode switching motor 186 is energized to drive the first drive gear 175, the first driven gear 176, and the first rotating body 177 regardless of the mode before the operation except the drill mode. The For this reason, the first eccentric pin 178 moves upward and pushes up the clutch member 124 upward. As a result, the clutch member 124 is separated from the driven gear 123, the meshing engagement with the driven gear 123 is released, and the crank mechanism 114 is switched to the power cut-off state. Then, when the drill 191b for the drill mode comes into contact with the first motor stop electric switch 188 and the operation signal from the electric switch 188 is input to the controller 161, the controller 161 recognizes that the switch to the drill mode has been made. The stop signal is output to the first mode switching motor 186 based on the input of the operation signal of the first motor stop electric switch 188. FIG. 29 is a flowchart showing the flow of processing and control by the controller 161 in the drill mode related to the first mode switching motor 186.

  On the other hand, the second mode switching motor 187 is energized when the pre-operation mode is the hammer mode or the neutral mode, and the second drive gear 179, the second driven gear 181 and the second rotating body 182 are rotated. For this reason, the second eccentric pin 183 moves rearward and moves away from the slide sleeve 147. As a result, the slide sleeve 147 is pushed by the biasing spring 148 and meshed with the large bevel gear 135, and the power transmission mechanism 117 is switched to the power transmission state. Further, the meshing engagement of the slide sleeve 147 with the lock ring 149 is released. When the common (for hammer drill mode and drill mode) protrusion 192b comes into contact with the second motor stop electrical switch 189 and an operation signal from the electrical switch 189 is input to the controller 161, the controller 161 is in the hammer drill mode. And a stop signal is output to the second mode switching motor 187 on the basis of the recognition of the switching to, and the operation signal of the second motor stop electric switch 189. However, if the mode before the operation is the hammer drill mode, the power transmission mechanism 117 is in the power transmission state, so the second mode switching motor 187 is not driven. FIG. 30 is a flowchart showing processing and control flow by the controller 161 in the drill mode related to the second mode switching motor 187. Thus, the mode of the hammer bit 119 is switched to the hammer drill mode. This state is shown in FIG. 19 and FIG. In this drill mode, if the drive motor 111 is energized and driven, the drilling operation by the rotation operation (drilling operation) of the hammer bit 119 can be performed.

[When the operator selects and operates the push button 159 for the neutral mode]
If the mode before the operation is in the drill mode, the first mode switching motor 186 is energized and the first driving gear 175, the first driven gear 176, and the first rotating body 177 are rotated. For this reason, the first eccentric pin 178 moves downward and is separated from the clutch member 124. As a result, the clutch member 124 meshes with the driven gear 123 and the crank mechanism 114 is switched to the power transmission state. When the common protrusion 191a comes into contact with the first motor stop electric switch 188 and an operation signal from the electric switch 188 is input to the controller 161, the controller 161 recognizes that the switch has been switched to the neutral mode, A stop signal is output to the first mode switching motor 186 based on the input of the operation signal of the 1-motor stop electrical switch 188. FIG. 31 is a flowchart showing the flow of processing and control by the controller 161 in the neutral mode related to the first mode switching motor 186. However, in the hammer mode or the neutral mode, the crank mechanism 114 is already in the power transmission state, so the first mode switching motor 186 is not driven.

  On the other hand, the second mode switching motor 187 is energized and driven regardless of the mode before the operation except the neutral mode, and the second drive gear 179, the second driven gear 181 and the second rotating body 182 are driven. It is rotated. In the case of the hammer mode, the second eccentric pin 183 moves backward, and the slide sleeve 147 approaches the large bevel gear 135 by the biasing spring 148, but before the slide sleeve 147 and the large bevel gear 135 are engaged with each other. At the same time, the projection 192c for the neutral mode comes into contact with the second motor stop electric switch 189. In the case of the hammer drill mode or the drill mode, the second eccentric pin 183 moves forward to push the slide sleeve 147 forward, and the meshing engagement between the slide sleeve 147 and the large bevel gear 135 is released. At this point, the neutral mode protrusion 192c contacts the second motor stop electric switch 189. In other words, in the neutral mode, when the slide sleeve 147 is placed at an intermediate position between the position in the hammer mode (front end position) and the position in the hammer drill mode and the drill mode (rear end position), The protrusion 192c comes into contact with the second motor stop electric switch 189. When the operation signal from the electric switch 189 is input to the controller 161, the controller 161 recognizes that the operation mode has been switched to the neutral mode and the operation signal of the second motor stop electric switch 189 is input. A stop signal is output to the second mode switching motor 187. FIG. 32 is a flowchart showing processing and control flow by the controller 161 in the neutral mode related to the second mode switching motor 187. Thus, the mode of the hammer bit 119 is switched to the neutral mode. This state is shown in FIG. 20 and FIG. In the neutral mode, the operator can adjust the orientation by grasping the tip of the hammer bit 119 with fingers.

  As described above, according to the present embodiment, the first eccentric pin 178 and the second eccentric pin 183 are individually driven by the first mode switching motor 186 and the second mode switching motor 187. When the first and second eccentric pins 178 and 183 are driven for mode switching, the operation amount or position of the first and second eccentric pins 178 and 183 can be individually set. A degree of design freedom regarding the position setting can be obtained.

  In the present embodiment, the technique in which the mode is switched by manually operating the mode selectively from a plurality of mode push buttons and energizing the mode switching motor is a hammer. For the drive mode of mode 119, (1) a hammer drill that switches between hammer drill mode and hammer mode, or (2) a hammer drill that switches between hammer drill mode and drill mode, or (3) hammer drill mode and hammer. The present invention can be applied to a hammer drill that switches between a mode and a drill mode, and further to a hammer drill that is provided with the neutral mode in each of the above (1) and (2). In the present embodiment, the case where the crank mechanism 114 is used as the mechanism for converting the rotation output of the drive motor 111 into a linear motion to drive the striker 143 has been described. However, instead of the crank mechanism 114, for example, a drive motor A swinging plate (swash plate) is attached to a rotating shaft that is rotationally driven by the shaft 111 at a predetermined inclination angle with respect to the axis of the rotating shaft. A swing mechanism configured to swing in the axial direction may be employed.

In view of the gist of the present invention, the following modes can be configured.
(Aspect 1)
"The hammer drill according to any one of claims 1 to 6,
The mode switching operation unit is disposed in a mode switching unit accommodation case, and the mode switching unit accommodation case is detachably attached to a side surface portion of the main body. "
According to the invention described in the aspect 1, it is possible to improve the assembling property or repairability of the mode switching operation unit with respect to the main body unit.

1 is a partially broken side view showing the overall configuration of a hammer drill according to a first embodiment of the present invention. It is a sectional side view which shows the principal part of a hammer drill, and shows the state switched to hammer mode. It is a sectional side view which shows the principal part of a hammer drill, and shows the state switched to hammer drill mode. It is a sectional side view which shows the principal part of a hammer drill, and shows the state switched to drill mode. It is a sectional side view which shows the principal part of a hammer drill, and shows the state switched to neutral mode. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is a side view which shows a mode switching mechanism, and shows the time of hammer mode. It is a side view which shows a mode switching mechanism, and shows the time of hammer drill mode. It is a side view which shows a mode switching mechanism, and shows the time of drill mode. It is a side view which shows a mode switching mechanism, and shows the time of neutral mode. It is a top view which shows a switch panel. It is a flowchart at the time of the hammer mode regarding a mode switching motor. It is a flowchart at the time of the hammer drill mode regarding a mode switching motor. It is a flowchart at the time of the drill mode regarding a mode switching motor. It is a flowchart at the time of the neutral mode regarding a mode switching motor. It is a sectional side view which shows the principal part of the hammer drill which concerns on 2nd Embodiment, and shows the state switched to hammer mode. It is side sectional drawing which similarly shows the principal part of a hammer drill, and shows the state switched to hammer drill mode. It is side sectional drawing which similarly shows the principal part of a hammer drill, and shows the state switched to drill mode. It is side sectional drawing which similarly shows the principal part of a hammer drill, and shows the state switched to neutral mode. It is a side view which shows the mode switching mechanism which concerns on 2nd Embodiment, and shows the time of hammer mode. It is a side view which similarly shows a mode switching mechanism, and shows the time of hammer drill mode. It is a side view which similarly shows a mode switching mechanism, and shows the time of drill mode. It is a side view which similarly shows a mode switching mechanism, and shows the time of neutral mode. It is a flowchart at the time of the hammer mode regarding the first mode switching motor. It is a flowchart at the time of the hammer mode regarding a 2nd mode switching motor. It is a flowchart at the time of the hammer drill mode regarding the first mode switching motor. It is a flowchart at the time of the hammer drill mode regarding a 2nd mode switching motor. It is a flowchart at the time of the drill mode regarding a 1st mode switching motor. It is a flowchart at the time of the drill mode regarding a 2nd mode switching motor. It is a flowchart at the time of the neutral mode regarding a 1st mode switching motor. It is a flowchart at the time of the neutral mode regarding a 2nd mode switching motor.

101 Hammer Drill 103 Main Body (Tool Main Body)
103a recess 105 motor housing 107 gear housing 109 hand grip 109a trigger 111 drive motor 113 motion conversion mechanism 114 crank mechanism 115 striking element 117 power transmission mechanism 119 hammer bit (tool bit)
121 Drive gear 122 Crankshaft 123 Driven gear 123a Clutch tooth 124 Clutch member 124a Clutch tooth 124b Flange portion 126 Energizing spring 129 Piston 132 Intermediate gear 133 Intermediate shaft 134 Small bevel gear 135 Large bevel gear 135a Clutch tooth 141 Cylinder 143 Strike 145 Impact bolt 147 Slide sleeve 147a Clutch tooth 147b Rotation lock tooth 147c Flange portion 148 Biasing spring 149 Lock ring 149a Tooth 151 Switch panel 152 Indicator lamp 153 Hammer mode push button (signal output portion)
155 Push button for hammer drill mode (signal output part)
157 Push button for drill mode (signal output part)
159 Neutral mode push button (signal output section)
161 Controller (control unit)
163 Electric wire 165 Electric wire 169 Mode switching mechanism (mode switching operation part)
171 Mode switching unit housing case 172 First switching mechanism (mode switching unit)
173 Second switching mechanism (mode switching unit)
174 Mode switching motor 175 First driving gear 176 First driven gear 177 First rotating body 178 First eccentric pin (first mode switching member)
179 Second driving gear 181 Second driven gear 182 Second rotating body 183 Second eccentric pin (second mode switching member)
184 Electric switch for motor stop (motor stop part)
185a Hammer mode protrusion (motor stop)
185b Hammer drill mode protrusion (motor stop)
185c Projection for drill mode (motor stop)
185d Neutral mode protrusion (motor stop)
186 First mode switching motor 187 Second mode switching motor 188 First motor stop electrical switch 189 Second motor stop electrical switch 191a Protrusion 191b for hammer mode, hammer drill mode and neutral mode Protrusion 192a for drill mode For hammer mode Protrusion 192b Protrusion for hammer mode and drill mode 192c Protrusion for neutral mode

Claims (6)

As a tool bit drive mode, at least one of a hammer drill mode that performs both a linear motion in the long axis direction and a rotational motion around the long axis, a hammer mode that performs only the linear motion, and a drill mode that performs only the rotary motion A hammer drill having a mode,
A plurality of signal output units that are provided according to each mode, and that output an electrical mode signal corresponding to the mode selected from the modes by manual operation of an operator;
A control unit that outputs an electrical drive signal corresponding to a mode signal input from the plurality of signal output units;
A mode switching operation unit that operates according to a drive signal from the control unit and performs mode switching;
The mode switching operation unit is
A mode switching motor that is energized and driven by a drive signal from the control unit;
The operated by the mode switching motor, have a, a mode switching unit for switching the mode between the plurality of modes,
The mode switching operation unit has a motor stop unit that stops the driving of the mode switching motor when the mode switching unit performs mode switching.
The motor stop unit includes: a rotating body that is rotationally driven by the mode switching motor; a plurality of protrusions that are arranged on the rotating body at predetermined intervals in the circumferential direction corresponding to the modes; and the plurality of protrusions. A hammer drill , comprising: an electric switch that is operated by contact and outputs a motor stop signal for stopping driving of the mode switching motor to the control unit . The hammer drill according to claim 1,
In addition to the hammer drill mode, each has the hammer mode and the drill mode, and the mode switching unit is configured to switch modes between the hammer drill mode, the hammer mode, and the drill mode. Hammer drill characterized by that. The hammer drill according to claim 2,
A first drive mechanism that linearly drives the tool bit in the long axis direction;
A first clutch mechanism that is provided in the first drive mechanism section and is switched between a power transmission state that transmits driving force and a power cutoff state that interrupts transmission of driving force;
A second drive mechanism unit that rotationally drives the tool bit about a long axis;
A second clutch mechanism that is provided in the second drive mechanism section and is switched between a power transmission state that transmits a driving force and a power cutoff state that interrupts the transmission of the driving force;
The mode switching unit includes a first mode switching member that switches a state of the first clutch mechanism, and a second mode switching member that switches a state of the second clutch mechanism,
The hammer drill characterized in that the first and second mode switching members are driven by a single mode switching motor. The hammer drill according to claim 3,
The single mode switching motor is configured as a double shaft type in which an output shaft protrudes from both end surfaces in the rotation axis direction of the mode switching motor, and the first mode switching member is driven on one end side of the output shaft. A hammer drill characterized in that the second mode switching member is driven on the other end side. The hammer drill according to claim 2,
A first drive mechanism that linearly drives the tool bit in the long axis direction;
A first clutch mechanism that is provided in the first drive mechanism section and is switched between a power transmission state that transmits driving force and a power cutoff state that interrupts transmission of driving force;
A second drive mechanism unit that rotationally drives the tool bit about a long axis;
A second clutch mechanism that is provided in the second drive mechanism section and is switched between a power transmission state that transmits a driving force and a power cutoff state that interrupts the transmission of the driving force;
The mode switching unit includes a first mode switching member that switches a state of the first clutch mechanism, and a second mode switching member that switches a state of the second clutch mechanism,
The hammer drill characterized in that the first and second mode switching members are individually driven by mode switching motors respectively provided according to the first and second mode switching members. A hammer drill according to any one of claims 1 to 5,
A hammer drill further comprising a neutral mode as a mode selected by an operator, and when the neutral mode is selected, the operator can manually rotate the tool bit.

Images